JP2019202388A - Steel pipe end part processing method and processing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for processing a steel pipe end portion capable of preventing a processed surface of a steel pipe after processing from being damaged by a copying roller. SOLUTION: A swinging member 36 swingably supported on a turntable 22 is provided with a first copying roller 42 that abuts an outer peripheral surface of a steel pipe 16 and a first tip that chamfers an outer end portion of the steel pipe 16. Is set up. The swing member 36 is biased by the first compression coil spring 48 so that the first copying roller 42 swings in the direction in which it is radially separated from the outer peripheral surface of the steel pipe 16. The urging force of the first compression coil spring 48 is smaller than the centrifugal force acting in the direction of pressing the first copying roller 42 against the outer peripheral surface of the steel pipe 16 when the turntable 22 is rotated at the rotation speed during processing, and is lower than the rotation speed during processing. It was set to be larger than the centrifugal force that acts in the direction in which the first copying roller 42 is pressed against the outer peripheral surface of the steel pipe 16 when the turntable 22 is rotated at a low rotation speed at the time of release. [Selection diagram] Figure 2

Description

  The present invention relates to a processing method and a processing apparatus for chamfering a steel pipe end portion.

  A chamfering device (processing device) that performs chamfering on the outer end portion of a steel pipe is provided with a rotating disk on a main shaft that is rotatably supported on the main body of the device so as to rotate integrally with the main shaft. A tool post is disposed on the front end surface of the rotating disk at a position that is displaced in the radial direction from the center of rotation of the rotating disk. In addition, a tool equipped with a tip corresponding to the processing position and processing shape of the steel pipe is mounted on the tool post. Then, the turret is positioned in accordance with the processing position of the steel pipe, and with the end face of the steel pipe facing the front end face of the turntable, the turntable is rotated in a required direction and moved so as to be close to the end of the steel pipe. By doing so, the outer end portion of the steel pipe is chamfered with the tip of the tool post that turns with the rotation of the turntable.

  In the chamfering device, the cutting tool is mounted on a rotating arm disposed so as to be swingable with respect to the tool post, and a copying roller capable of contacting the outer peripheral surface of the steel pipe is rotatably disposed. The cutting tool is positioned so that the tip is properly positioned at the processing position of the end portion of the steel pipe with the copying roller in contact with the outer peripheral surface of the steel pipe. Further, the rotating arm is urged by a spring so that the copying roller always abuts on the outer peripheral surface of the steel pipe. Then, by rotating the rotating disk with the rotating arm biased by a spring so that the copying roller is in contact with the outer peripheral surface of the steel pipe, the tip of the bite properly rotates along the outer end of the steel pipe, Chamfering can be performed with high accuracy (see, for example, Patent Document 1).

JP 2003-25103 A

  In the chamfering device, the rotating arm is urged by the spring so that the copying roller is always brought into contact with the outer peripheral surface of the steel pipe. Therefore, after the chamfering process, the rotating disk is moved away from the steel pipe end in the axial direction. In addition, since the copying roller biased by the spring moves while being pressed against the chamfered processing surface, the processing surface is damaged by the copying roller. In addition, after chamfering, the rotating disk is rotated away from the end of the steel pipe in the axial direction while rotating, and the centrifugal force acting on the rotating arm at this time is in the direction of pressing the copying roller against the outer peripheral surface of the steel pipe. Therefore, the copying roller is pressed against the processing surface by the centrifugal force and the biasing force of the spring, so that there is a problem that the processing surface is significantly damaged.

  The present invention has been proposed to solve this problem in view of the above-described problems inherent in the prior art, and can prevent the processed surface of the steel pipe from being damaged by the copying roller. It aims at providing the processing method and processing apparatus of a steel pipe edge part.

In order to overcome the above-mentioned problems and achieve the intended purpose, a method for processing a steel pipe end portion according to the invention of claim 1 comprises:
A processing method for processing the end of the steel pipe by turning the processing means provided on the rotating disk around the central axis of the steel pipe,
A copying roller provided on the rotating disk so as to move integrally with the processing means is attached so that the copying roller is separated from the outer peripheral surface of the steel pipe in the radial direction by a centrifugal force accompanying the rotation of the rotating disk. In the state where the outer peripheral surface of the steel pipe is abutted against the urging force of the urging means to be urged, the rotary disk is moved forward and processed so as to press the processing means against the end of the steel pipe,
When the rotating disk that has been processed by the processing means is moved backward, the rotational speed of the rotating disk is adjusted before the copying roller reaches the processing surface of the steel pipe, and the centrifugal force associated with the rotation is applied to the biasing means. The gist is that the copying roller is separated from the outer peripheral surface of the steel pipe by the urging force of the urging means by lowering it to be smaller than the urging force.
According to this, since the copying roller can be separated from the outer peripheral surface of the steel pipe by the urging force of the urging means by changing the rotation speed of the rotating disk, the copying roller is used when the rotating disk is separated from the steel pipe. It is not pressed against the processed surface of the steel pipe, and the processed surface can be prevented from being damaged, and the product quality obtained can be improved.

The invention according to claim 2
When processing by the processing means is completed, after the processing means moves backward until the processing means moves outward from the end face of the steel pipe, the rotating disk until the centrifugal force becomes smaller than the urging force of the urging means. The gist is to reduce the rotation speed of.
According to this, since the processing means is not pressed against the processing surface of the steel pipe by the urging force of the urging means until the processing means reaches outside from the end surface of the steel pipe, the processing surface is damaged by the processing means. Can be prevented.

In order to overcome the above-mentioned problems and achieve the intended purpose, a steel pipe end machining apparatus according to the invention of claim 3 is provided:
A processing device for turning an end of a steel pipe by turning a processing means provided on a rotating disk around a central axis of the steel pipe,
Moving means capable of moving the rotating disk in the direction of the central axis of the steel pipe;
A copying roller disposed on the rotating plate so as to be able to rotate and move integrally with the processing means, and capable of contacting the outer peripheral surface of the steel pipe;
A biasing means for biasing the copying roller in a direction away from the outer peripheral surface of the steel pipe in the radial direction;
Drive means for rotationally driving the turntable;
An actuating means for moving the copying roller in a direction in contact with the outer peripheral surface of the steel pipe by a centrifugal force accompanying the rotation of the rotating disk;
When processing the steel pipe, the rotating roller is rotated at a rotational speed at which centrifugal force is larger than the urging force of the urging means so that the copying roller moved by the actuating means contacts the outer peripheral surface of the steel pipe, and When moving the rotary table that has been processed by the processing means, the scanning roller is rotated at a rotational speed at which centrifugal force is smaller than the urging force so that the copying roller is separated from the outer peripheral surface of the steel pipe by the urging force of the urging means. The gist is that the driving means can be controlled to rotate the rotating disk.
According to this, since the copying roller can be separated from the outer peripheral surface of the steel pipe by the urging force of the urging means by changing the rotation speed of the rotating disk, the copying roller can be separated when the rotating disk is separated from the steel pipe. Can be prevented from being pressed against the machined surface of the steel pipe, and the machined surface can be prevented from being damaged, and the resulting product quality can be improved. Further, the configuration is such that the copying roller is brought into contact with or separated from the outer peripheral surface of the steel pipe using the centrifugal force generated when the rotating disk rotates and the urging force of the urging means. Therefore, it is not necessary to use driving means that moves close to and away from each other, and it is possible to prevent damage to the processed surface with a simple configuration.

The invention according to claim 4
The copying roller is arranged on the front side of the processing means in the direction in which the moving means is close to the end surface of the steel pipe by the moving means,
After moving the rotating disk, which has been processed by the processing means, with the moving means until the processing means reaches outside from the end face of the steel pipe while rotating at a rotational speed at which centrifugal force is greater than the biasing force. The gist of the invention is that the driving means is controlled so that the rotating disk is rotated at a rotational speed at which the centrifugal force is smaller than the urging force before the copying roller reaches the processing surface of the end portion of the steel pipe.
According to this, since the processing means is not pressed against the processing surface of the steel pipe by the urging force of the urging means until the processing means reaches outside from the end surface of the steel pipe, the processing surface is damaged by the processing means. Can be prevented.

The invention according to claim 5
The gist of the invention is that it includes a regulating member that regulates the position of the copying roller that is moved by the urging force of the urging means at a position away from the outer peripheral surface of the steel pipe.
According to this, since the position of the copying roller that is moved by the urging force of the urging means is restricted by the restricting member, a state in which a centrifugal force smaller than the urging force of the urging means is generated or rotation of the rotating disk is prevented. When the rotating disk is moved in a stopped state, the copying roller can be supported at a fixed position.

  According to the method and apparatus for processing the end of a steel pipe according to the present invention, it is possible to prevent the processed surface of the steel pipe from being damaged when moving the copying roller.

It is a schematic structure figure showing the whole processing device concerning an example. It is a front view of the turntable in the processing apparatus concerning an example. It is A arrow directional view of FIG. 2 which shows the 1st tool post which concerns on an Example. It is the B arrow directional view of FIG. 2 which shows the 2nd tool post which concerns on an Example. It is explanatory front view which expands and shows the 1st tool post which concerns on an Example. It is process drawing at the time of chamfering the inner end part of a steel pipe with the 2nd tip concerning an example. It is a timing chart figure of the processing device concerning an example.

  Next, a steel pipe end processing method and processing apparatus according to the present invention will be described below with reference to the accompanying drawings by giving a preferred embodiment.

  FIG. 1 is a schematic configuration diagram showing an entire processing apparatus according to an embodiment. A pair of guide rails 12 and 12 (only one of them is shown) are arranged in parallel on the upper surface of a base 10. An apparatus main body 14 is slidably mounted on 12. On the base 10 facing the front of the apparatus main body 14, a holding device 18 that holds the steel pipe 16 with the end surface of the steel pipe 16 facing the apparatus main body 14 is disposed. The apparatus main body 14 is moved by a moving means 20 comprising a combination of a screw shaft and a nut rotated forward and backward by a servo motor, which is driven and controlled by a control means (not shown) with respect to the steel pipe 16 held by the holding device 18. The rotating disk 22 to be described later can be moved close to and away from the end face of the steel pipe by moving in the direction of the central axis of the steel pipe 16. Further, the moving means 20 uses the position detecting means (not shown) such as an encoder provided in the servo motor to determine the position of the apparatus main body 14 (tips 38a, 52a as processing means to be described later and the copying rollers 42, 54) with respect to the steel pipe 16. ) Can be detected, and the control means is configured to be able to perform variable speed control of the rotational speed of the rotating plate 22 described later based on position detection by the position detection means.

  A main shaft (not shown) is rotatably supported in the apparatus main body 14 in parallel with the guide rail 12, and a circular turntable 22 is integrally formed at a shaft end protruding from the main body of the main shaft. It is arranged to rotate. A drive motor (drive means) 24 is connected to the main shaft via a transmission system (not shown) made up of gears, belts, etc., and the drive motor 24 is driven and controlled by the control means, so that the main shaft and the rotating disk are controlled. 22 is configured to rotate integrally. The steel pipe 16 is positioned with respect to the turntable 22 in a state where the axis of the steel pipe 16 coincides with the rotation center of the turntable 22. In the embodiment, the main shaft becomes the rotation shaft of the turntable 22. In the embodiment, the proximity movement of the turntable 22 relative to the steel pipe 16 held by the holding device 18 may be referred to as forward movement, and the separation movement of the turntable 22 relative to the steel pipe 16 may be referred to as backward movement.

As shown in FIG. 2, two tool rests 26, 28 are provided on the front surface of the turntable 22 along a reference line L extending in the radial direction through the rotation center C ₀ of the turntable 22. It is arranged to be movable. Since the basic configuration related to the two tool rests 26 and 28 is the same, the configuration related to the first tool rest 26 disposed above the rotation center C ₀ of the turntable 22 in FIG. 2 will be described. The same members related to the lower second tool rest 28 are denoted by the same reference numerals.

  Two guides 30, 30 are provided on the rotating disk 22 in a direction perpendicular to the reference line L and parallel to the reference line L, and the first tool post along the guides 30, 30. 26 is slidable, and can be directly positioned and fixed to the rotating disk 22 at an arbitrary position by bolts 32 as a plurality of (four in the embodiment) fixing means. Although not shown in the drawing, a scale with scales provided at predetermined intervals in the extending direction of the guide 30 is disposed on the front surface of the turntable 22, and the operator attaches the first tool post 26 to the pipe of the steel pipe 16. By adjusting to an arbitrary scale corresponding to the diameter, the position adjustment of the first tool post 26 can be easily performed.

A support shaft 34 protrudes forward from the first tool post 26 in parallel with the main shaft, and a swing member (actuating means) 36 is swingably supported by the support shaft 34. Across the support shaft 34 of the swing member 36, the first arm portion 36a extending in one radial direction of the support shaft 34 (the side close to the rotation center C ₀ of the rotating disk 22), the steel pipe 16 A first cutting tool 38 to which a first tip 38a for chamfering the outer end of the first tool (outer end processing means) 38a is attached is detachably mounted (see FIG. 3). Further, a holding shaft 40 parallel to the support shaft 34 (main shaft) is projected forward from the first arm portion 36a, and a first scanning roller (a copy for the outer end portion) is projected to the holding shaft 40. Roller) 42 is rotatably arranged. That is, the swing member 36 is supported by the first tool post 26 (rotary disc 22) so as to be swingable about an axis parallel to the rotation axis (main shaft) of the rotary disc 22, and the first scanning roller 42 is The swinging member 36 is disposed so as to be rotatable about an axis parallel to the rotation axis (main axis) of the turntable 22.

  The first scanning roller 42 and the first tip 38a disposed on the first tool post 26 are configured such that the swinging member 36 swings in a direction separating the first scanning roller 42 from the outer peripheral surface of the steel pipe 16, The first tip 38a moves in a direction away from the outer end portion of the steel pipe 16, and the swing member 36 swings in a direction in which the first copying roller 42 comes into contact with the outer peripheral surface of the steel pipe 16, whereby the first tip 38a. Is moved in the direction approaching the outer end of the steel pipe 16.

  As shown in FIG. 3, the first copying roller 42 is formed with a copying surface 42a having an equal outer diameter on the outer peripheral surface and a guide surface 42b that is continuous with the copying surface 42a and gradually decreases in diameter toward the front end. In the chamfering process (machining) by the first tip 38a, the copying surface 42a is configured to come into contact with the outer peripheral surface of the steel pipe 16. The first scanning roller 42 is disposed on the front side of the first tip 38a in the direction in which the rotating plate 22 approaches the end surface of the steel pipe 16 with respect to the swing member 36, and moves forward when the rotating plate 22 moves forward. The first scanning roller 42 comes into contact with the steel pipe 16 first, and after the copying surface 42a of the first copying roller 42 comes into contact with the outer peripheral surface of the steel pipe 16, the first chip 38a is the processing portion. It is configured to be pressed against the outer end of the steel pipe 16. That is, when the copying surface 42a rotates in the copying state in which the copying surface 42a is in contact with the outer peripheral surface of the steel pipe 16, the first tip 38a turns around the central axis of the steel pipe 16 and the outer end portion is chamfered. It is supposed to be. The guide surface 42b of the first copying roller 42 functions to guide the copying surface 42a to the outer peripheral surface when the rotary disk 22 is moved close to the end surface of the steel pipe 16.

As shown in FIGS. 2 and 5, the center of gravity position M ₁ of the swing member 36 supported by the first tool rest 26 is set to the first scanning roller 42 with the swing center C ₁ of the swing member 36 interposed therebetween. The centrifugal force generated in the rocking member 36 when the rotating plate 22 is rotated in a required direction (clockwise in FIG. 2 in the embodiment) for chamfering is located on the side opposite to the arrangement side of The first scanning roller 42 is configured to act so as to swing the swinging member 36 in a direction in which the first copying roller 42 contacts the outer peripheral surface of the steel pipe 16. That is, the rocking member 36 functions as an operating means that moves the first scanning roller 42 in a direction in contact with the outer peripheral surface of the steel pipe 16 by the centrifugal force accompanying the rotation of the turntable 22.

  As shown in FIG. 2, a movable side support member 44 is disposed on a second arm portion 36b extending in a direction opposite to the first arm portion 36a across the support shaft 34 of the swing member 36, and the first A fixed-side support member 46 is disposed on the one tool post 26 at a position away from the movable-side support member 44. A first compression coil spring (urging means for the outer end) 48 as an urging means is elastically interposed between the support members 44 and 46. The first compression coil spring 48 causes the swinging member 36 to move the support shaft 34 in the direction in which the first copying roller 42 is radially separated from the outer peripheral surface of the steel pipe 16 (counterclockwise in FIGS. 2 and 5). It functions to urge it to swing around the center.

  The front surface of the first tool post 26 is rotated clockwise in FIG. 2 against the urging force of the first compression coil spring 48 due to the centrifugal force generated when the turntable 22 is rotated at the processing rotation speed RA described later. A stopper 50 is provided at a position where the first arm portion 36a of the swinging swinging member 36 can come into contact, and the swinging angle of the swinging member 36 is regulated by the stopper 50. In the embodiment, the guide surface 42b of the first copying roller 42 can come into contact with the outer end edge of the steel pipe 16 held by the holding device 18 in a state where the first arm portion 36a is in contact with the stopper 50. It is configured to face the position (see FIG. 6A). That is, at the start of chamfering by the processing apparatus, when the rotary disk 22 is moved forward so as to be close to the end surface of the steel pipe 16, the guide surface 42b of the first copying roller 42 contacts the outer end edge of the steel pipe 16. Further, when the turntable 22 further moves forward, the swinging member 36 swings, and the copying surface 42a of the first copying roller 42 is guided so as to reach the outer peripheral surface of the steel pipe 16 (see FIG. 6B). ). Further, the first tool rest 26 is placed at a position where the first arm portion 36a of the swinging member 36 swinging counterclockwise in FIG. 2 can be brought into contact with the first tool post 26 by the biasing force of the first compression coil spring 48. Is disposed, and the first copying roller 42 is configured to be positioned at a position where the copying surface 42a is separated from the outer peripheral surface of the steel pipe 16 by abutting the first arm portion 36a with the regulating member 51 (FIG. 6). (See (d)).

Here, in the processing apparatus, when the rotating disk 22 is rotated at the processing rotation speed RA of the rotating disk 22 during chamfering and the rotating disk 22 is rotated at the processing rotation speed RA, the first copying roller 42 is placed on the outer peripheral surface of the steel pipe 16. A centrifugal force during processing that acts to swing the swinging member 36 in the abutting direction is FA ₁ , and an urging force that separates the first scanning roller 42 from the outer peripheral surface of the steel pipe 16 by the first compression coil spring 48 is K _1. and when, during processing the centrifugal force FA ₁ is configured to be greater than the biasing force K _1. Further, when the rotating disk 22 is rotated at the release rotational speed RB, which is lower than the processing rotational speed RA, and the rotating disk 22 is rotated at the release rotational speed RB, the first copying roller 42 is swung in a direction in contact with the outer peripheral surface of the steel pipe 16. When the release centrifugal force acting to swing the moving member 36 is FB ₁ , the release centrifugal force FB ₁ is configured to be smaller than the biasing force K ₁ . That is, the first scanning roller 42 when rotating the turntable 22 by the processing time of the rotational speed RA, the processing time of the centrifugal force FA ₁ is that the greater than the biasing force K ₁ in the first compression coil spring 48, the first copying roller 42 is pressed so as to contact the outer peripheral surface of the steel pipe 16 by the processing time of the centrifugal force FA _1. On the other hand, when the turntable 22 is rotated at the release rotational speed RB, the first scanning roller 42 has the release centrifugal force FB ₁ smaller than the biasing force K ₁ of the first compression coil spring 48, thereby copying roller 42 is spaced from the outer peripheral surface of the steel pipe 16 by the urging force K _1. In the embodiment, the urging force K ₁ , the processing centrifugal force FA ₁ , and the release centrifugal force FB ₁ are set to have a relationship of FB ₁ <K ₁ <FA ₁ .

  Further, with the copying surface 42a of the first copying roller 42 in contact with the outer peripheral surface of the steel pipe 16, the first tip 38a contacts the outer end of the steel pipe 16 at a required angle as shown in FIG. The chamfering process can be applied to the part. Then, the cutting force generated when the first tip 38a chamfers the outer end portion of the steel pipe 16 with the tip 38a with respect to the rocking member 36, so that the rocking member 36 is rotated clockwise in FIG. The first copying roller 42 is disposed at a position that acts to urge the first copying roller 42 in a direction in which the first copying roller 42 is pressed against the outer peripheral surface of the steel pipe 16. This prevents the first copying roller 42 from being separated from the outer peripheral surface of the steel pipe 16 during the chamfering process and lowering the machining accuracy.

  Next, the configuration related to the second tool post 28 will be described with respect to a configuration different from the configuration related to the first tool post 26. A second tip (processing means for the inner end) 52a for chamfering (processing) the inner end portion of the steel pipe 16 to the first arm portion 36a of the swinging member 36 disposed on the second tool post 28. The second bite 52 to which is attached is detachably attached. Further, the second copying roller 54 rotatably disposed on the holding shaft 40 protruding from the first arm portion 36a has a copying surface 54a and a guide surface similar to the first copying roller 42, as shown in FIG. 54b is formed, and when the chamfering process is performed by the second tip 52a, the copying surface 54a abuts on the outer peripheral surface of the steel pipe 16, and the copying surface 54a is guided to the outer peripheral surface of the steel pipe 16 by the guide surface 54b. Is done.

  The second compression coil spring (the biasing means for the inner end) as the biasing means disposed on the second arm portion 36b of the swinging member 36 of the second tool rest 28 with the same configuration as the first tool rest 26. 56), the swinging member 36 is moved around the support shaft 34 in the direction in which the second scanning roller 54 is radially separated from the outer peripheral surface of the steel pipe 16 (counterclockwise in FIG. 2). It functions to urge it to swing. The second tool post 28 is provided with a stopper 50 and a restricting member 51 having the same functions as the stopper 50 and the restricting member 51 provided on the first tool post 26, and the stopper 50 and the restricting member 51. Thus, the swing angle of the swing member 36 can be regulated.

  With the copying surface 54a of the second copying roller 54 in contact with the outer peripheral surface of the steel pipe 16, as shown in FIG. 4, the second tip 52a contacts the inner end of the steel pipe 16 at a required angle, It is set so that the part can be chamfered. Further, the cutting force generated when the second tip 52a chamfers the inner end portion of the steel pipe 16 with the tip 52a with respect to the swing member 36, so that the swing member 36 is rotated clockwise in FIG. 2 The copying roller 54 is disposed at a position that acts so as to swing in a direction in which it abuts on the outer peripheral surface of the steel pipe 16. This prevents the second scanning roller 54 from being separated from the outer peripheral surface of the steel pipe 16 during the chamfering process and lowering the machining accuracy.

  The second scanning roller 54 and the second tip 52a disposed on the second tool post 28 swing the swinging member 36 in a direction separating the second scanning roller 54 from the outer peripheral surface of the steel pipe 16. As a result, the second tip 52a moves in the direction approaching the inner end of the steel pipe 16, and the swing member 36 swings in the direction in which the second copying roller 54 contacts the outer peripheral surface of the steel pipe 16. The two tips 52a move in a direction away from the inner end of the steel pipe 16 (see FIG. 6).

As shown in FIG. 2, the center of gravity position M ₂ of the swing member 36 supported by the second tool post 28 is located on the side where the second scanning roller 54 is disposed across the swing center C ₁ of the swing member 36. The centrifugal force generated in the rocking member 36 when the rotating disk 22 is rotated clockwise in FIG. 2 to chamfer the second copying roller 54 is positioned on the outer side of the steel pipe 16. The swinging member 36 is configured to swing in the direction in which the swinging member 36 abuts. That is, the swinging member 36 functions as an operating means that moves the second scanning roller 54 in a direction in contact with the outer peripheral surface of the steel pipe 16 by the centrifugal force accompanying the rotation of the turntable 22. Then, in the second tool post 28, the machining centrifugal force generated in the swing member 36 when the turntable 22 is rotated at the machining rotation speed RA and the machining rotation speed RA during the chamfering by the machining apparatus. Relationship between FA ₂ , urging force K ₂ by the second compression coil spring 56, rotation speed RB at release, and centrifugal force FB ₂ at release generated in the rocking member 36 when the turntable 22 is rotated at the rotation speed RB at release Is the same as that described in relation to the first tool post 26. That is, when the rotating disk 22 is rotated at the processing rotational speed RA, the second scanning roller 54 causes the processing centrifugal force FA ₂ to be larger than the urging force K ₂ by the second compression coil spring 56, so that the second scanning roller 54 54 is pressed so as to contact the outer peripheral surface of the steel pipe 16 by the processing time of the centrifugal force FA _2, second scanning roller 54 when rotating the turntable 22 by releasing during rotation speed RB is the cancellation centrifugal force FB ₂ By being smaller than the urging force K ₂ of the second compression coil spring 56, the second copying roller 54 is separated from the outer peripheral surface of the steel pipe 16 by the urging force K ₂ . Further, the biasing force _{K 2,} the processing time of the centrifugal force FA _2, the relationship between the release time of the centrifugal force FB _2, in the same manner as described in connection with the first tool rest _26, is set to FB _{2 <K 2 <FA 2} The

  In the machining apparatus of the embodiment, as shown in FIG. 7, when chamfering is performed, the control means moves the apparatus main body 14 forward from a standby position separated from the steel pipe 16 held by the holding device 18. The moving means 20 (servo motor) is controlled so that the turntable 22 comes close to the steel pipe 16, and the rotation speed of the turntable 22 is processed until each of the copying rollers 42 and 54 comes into contact with the steel pipe 16. The drive motor 24 is controlled so as to achieve the hourly rotation speed RA. After the chamfering of the outer end portion and the inner end portion of the steel pipe 16 at the tips 38a and 52a is completed, the control means controls the moving means 20 (servo motor) to move the apparatus main body 14 backward. When the rotating disk 22 is separated from the steel pipe 16, the rotating speed of the rotating disk 22 is released before the copying rollers 42 and 54 reach the processed surface 16a of the processed outer end of the steel pipe 16. The drive motor 24 is controlled so as to be lowered to RB. In the processing apparatus of the embodiment, the second tip 52a for chamfering the inner end portion of the steel pipe 16 is moved from the end face of the steel pipe 16 when the turntable 22 moves backward after the chamfering processing by the chips 38a and 52a is completed. Until it reaches the outside (until the processing means comes out of the steel pipe), the rotational speed of the rotating disk 22 is maintained at the rotational speed RA during processing, and then the copying rollers 42, 54 are released before reaching the processing surface 16a. The drive motor 24 is configured to be controlled by the control means so as to decrease to the hour rotation speed RB. The control means recognizes the timing at which the second tip 52a moves outward from the end face of the steel pipe 16 and the timing at which the copying rollers 42, 54 reach the machining surface 16a by the position detection means provided on the moving means 20.

(Effects of Example)
Next, the operation of the processing apparatus of the embodiment configured as described above will be described in relation to the processing method.

In the apparatus main body 14 located at the standby position, the positions of the first tool rest 26 and the second tool rest 28 are respectively adjusted with respect to the turntable 22 in accordance with the dimensions of the steel pipe 16 held by the holding device 18. Fix the bolts. At this time, each of the swinging members 36 is held in a non-pressing state in which the swinging members 36 are in contact with the regulating member 51 by the biasing forces K ₁ and K ₂ of the corresponding compression coil springs 48 and 56, respectively. In this non-pressing state, the copying surfaces 42a and 54a of the copying rollers 42 and 54 are positioned radially outward from the position corresponding to the outer peripheral surface of the steel pipe 16 to be processed.

The moving body 20 moves the apparatus main body 14 and the rotating disk 22 forward, and the driving motor 24 rotationally drives the rotating disk 22. When the rotational speed of the turntable 22 rises above the release rotational speed RB, the centrifugal force that swings each rocking member 36 clockwise in FIG. 2 by the biasing forces K ₁ and K _{2 of the} compression coil springs 48 and 56. Each of the swing members 36 swings clockwise against the urging forces K ₁ and K ₂ of the compression coil springs 48 and 56, and each first arm portion 36 a comes into contact with the corresponding stopper 50. The position is restricted. That is, the guide surfaces 42b and 54b of the copying rollers 42 and 54 are positioned at positions where they can contact the outer end edge of the steel pipe 16 (see FIG. 6A).

  As shown in FIG. 7, when the rotating disk 22 is moved forward together with the apparatus main body 14 while maintaining the rotation speed of the rotating disk 22 at the processing rotation speed RA, the guide surfaces 42b and 54b of the copying rollers 42 and 54 are It abuts against the outer edge of the steel pipe 16. As the apparatus main body 14 and the turntable 22 move forward, the swinging members 36 are centered on the support shaft 34 in the state where the guide surfaces 42b and 54b are in contact with the outer edge of the steel pipe 16. Each of the copying rollers 42 and 54 moves outward in the radial direction of the steel pipe 16 while swinging counterclockwise, and the copying surfaces 42 a and 54 a come into contact with the outer peripheral surface of the steel pipe 16. With the copying surfaces 42a and 54a in contact with the outer peripheral surface of the steel pipe 16, the first tip 38a of the first cutting tool 38 follows the outer peripheral end along a locus that follows the outer peripheral surface of the steel pipe 16 by the rotation of the rotating disk 22. While turning, the second tip 52 a of the second bite 52 turns along the inner peripheral end along a locus that follows the outer peripheral surface of the steel pipe 16 by the rotation of the rotating disk 22.

When the rotation speed of the rotating disk 22 is maintained at the rotation speed RA during processing and the rotating disk 22 is further moved forward, the outer end portion of the steel pipe 16 is chamfered by the rotating first tip 38a, and the turning The inner end of the steel pipe 16 is chamfered by the second tip 52a (see FIG. 6B). At this time, each of the copying rollers 42 and 54 is applied to the outer peripheral surface of the steel pipe 16 with a required pressing force by the processing centrifugal forces FA ₁ and FA _{2 which} are larger than the biasing forces K ₁ and K ₂ of the corresponding compression coil springs 48 and 56. Since they are pressed so as to come into contact with each other, reliable copying is performed by the copying rollers 42 and 54, and highly accurate chamfering is achieved. Further, since the cutting force by the chips 38a and 52a also acts in the direction of pressing the copying rollers 42 and 54 so as to contact the outer peripheral surface of the steel pipe 16, more reliable copying by the copying rollers 42 and 54 is performed.

When the chamfering by the chips 38a and 52a is completed, the control means controls the moving means 20 (servo motor) to move the rotating disk 22 together with the apparatus main body 14 backward so as to be separated from the steel pipe 16. In this case, before the copying rollers 42 and 54 reach the processing surface 16 a of the steel pipe 16, the control means controls the rotation speed of the rotating disk 22 until the second tip 52 a reaches outward from the end face of the steel pipe 16. Is controlled to maintain the rotation speed RA during processing. That is, until the second tip 52a reaches outwardly from the end surface of the steel pipe 16, the scanning by the urging force _{K 1,} a large processing time centrifugal force than _{K 2} FA _1, FA ₂ of the compression coil spring 48, 56 roller 42, 54 Is in contact with the outer peripheral surface of the steel pipe 16, the second tip 52a is not pressed against the processing surface 16b of the inner end portion of the steel pipe 16, and the processing surface 16b is not damaged.

After the second tip 52a reaches outside from the end surface of the steel pipe 16 (after the tips 38a and 52a are separated from the processed surfaces 16a and 16b of the steel pipe 16), the control means controls the drive motor 24. Thus, the rotational speed of the rotary disk 22 is lowered to the rotational speed RB at the time of release. Since the urging forces K ₁ and K ₂ of the compression coil springs 48 and 56 are larger than the release centrifugal forces FB ₁ and FB ₂ generated at the release rotation speed RB, the urging forces K ₁ and K _{2 of the} compression coil springs 48 and 56 are. Thus, each swing member 36 swings in a direction in which the copying rollers 42 and 54 are separated from the outer peripheral surface of the steel pipe 16. Therefore, before the copying rollers 42 and 54 moving with the backward movement of the rotating disk 22 reach the processing surface 16a of the steel pipe 16, the copying rollers 42 and 54 are separated from the outer peripheral surface of the steel pipe 16 in the radial direction. The copying rollers 42 and 54 are not pressed against the processed surface 16a chamfered by the first chip 38a, and the processed surface 16a is prevented from being damaged.

In the processing apparatus according to the embodiment, compression coil springs 48 and 56 for swinging and biasing the swinging member 36 in a direction in which the copying rollers 42 and 54 are separated from the outer peripheral surface of the steel pipe 16 are provided, and the compression coil springs 48 and 56 are attached. The forces K ₁ and K ₂ are applied by the processing centrifugal forces FA ₁ and FA ₂ acting in the direction in which the copying rollers 42 and 54 come into contact with the outer peripheral surface of the steel pipe 16 when the rotating disk 22 is rotated at the processing rotation speed RA. Release centrifugal force FB ₁ , FB acting in the direction in which the copying rollers 42, 54 abut against the outer peripheral surface of the steel pipe 16 when the turntable 22 is rotated at a release rotation speed RB that is smaller than the processing rotation speed RA. Having greater than _2, only lowers the rotational speed of the rotating disk 22 to the release time of the rotational speed RB from the processing time of the rotational speed RA, scanning by the urging force _{K 1, K 2} of the compression coil spring 48, 56 rollers 42,5 Can be spaced away from the outer peripheral surface of the steel pipe 16. That is, a simple configuration provided with the compression coil springs 48 and 56 achieves reliable copying by the copying rollers 42 and 54, and prevents the processed surface 16a after chamfering from being damaged by the copying rollers 42 and 54. Can improve product quality. Further, since the copying rollers 42 and 54 can be brought into contact with or separated from the outer peripheral surface of the steel pipe 16 simply by changing the rotation speed of the rotating plate 22, the copying rollers 42 and 54 are close to the outer peripheral surface of the steel pipe 16. -It is not necessary to use driving means such as a dedicated cylinder or motor for moving away from each other, and it is possible to prevent the machining surface 16a from being damaged with a simple configuration.

Moreover, in order to chamfer the inner end portion of the steel pipe 16 together with the chamfering process of the outer end portion of the steel pipe 16 as in the embodiment, the second tool post 28 is brought into contact with the outer peripheral surface of the steel pipe 16. When the second scanning roller 54 for the inner end portion and the second tip 52a for the inner end portion that move integrally with the second scanning roller 54 are provided, the rotating disk is used after the chamfering process is completed. When the second tip 52a moves outward from the end surface of the steel pipe 16, the rotational speed of the rotating disk 22 is maintained at the processing rotational speed RA until the second tip 52a moves outward from the end surface of the steel pipe 16. second scanning roller 54 can be prevented from being separated from the outer peripheral surface of the steel tube 16 by the biasing force K _2. That is, rather than the second chip 52a by the biasing force K ₂ of the second compression coil spring 56 is pressed against the working surface 16b of the inner end portion of the steel pipe 16 can reliably prevent the pressurized Kumen 16b is a being damaged.

Further, in a state where a centrifugal force smaller than the urging forces K ₁ , K ₂ of the compression coil springs 48, 56 is acting on the swing member 36, or in a state where the rotation of the turntable 22 is stopped, the compression coil springs 48, Since the restricting member 51 for restricting the position of the swinging member 36 biased by the biasing forces K ₁ and K _{2 of} 56 is provided, it is possible to prevent the swinging member 36 from rattling when the turntable 22 is moved. Thus, the copying rollers 42 and 54 can be supported at fixed positions.

[Example of change]
The present application is not limited to the configuration of the above-described embodiment, and other configurations can be appropriately employed.
1. In the embodiment, the compression coil spring is used as the biasing means for biasing the copying roller away from the outer peripheral surface of the steel pipe, but various springs such as a tension coil spring and a disc spring can be used.
2. In the embodiment, two turrets are arranged on the rotating disk. However, one or three or more turrets may be arranged, and each turret has only to adopt the configuration of the present invention. .
3. If the turret is configured so that only the tool post for chamfering the outer end portion of the steel pipe (the first tool post in the embodiment) is disposed on the turntable, after the chamfering is completed, the retreat movement of the turntable is started. Before, the rotational speed of the rotating disk may be immediately lowered to the rotational speed at the time of release. That is, since both the first copying roller and the first tip (the processing means for the outer end) are located outside the steel pipe, the first copying roller is moved from the outer peripheral surface of the steel pipe by the urging force of the first compression coil spring. This is because the first tip does not interfere with the steel pipe even if they are separated.
4). In the configuration of the embodiment, by providing a weight on the swing member and changing the position of the center of gravity, the centrifugal force acting at the chamfering process is increased, and the pressing force for pressing the copying roller against the outer peripheral surface of the steel pipe at the chamfering process is increased. Thus, more stable copying can be performed.
5. In the embodiment, the oscillating member is arranged on the tool post arranged so that the position of the oscillating plate can be adjusted with respect to the rotating disk. The moving member may be arranged directly on the rotating disk.

6). In the embodiment, the rotational speed of the rotating disk when the copying roller is moved in the direction in contact with the outer peripheral surface of the steel pipe against the biasing force of the compression coil spring is the rotational speed at the time of processing. The rotational speed of the rotating disk when the copying roller is moved in the direction in contact with the outer peripheral surface of the steel pipe as long as the centrifugal force accompanying the rotation of the rotating disk is larger than the urging force of the compression coil spring is sufficient. . That is, in the embodiment, when the rotary disk is moved backward after the completion of machining, the rotation speed of the rotary disk is maintained at the rotation speed during machining until the second tip (machining means) is moved outward from the end surface of the steel pipe. However, if the centrifugal force is greater than the urging force of the compression coil spring until the second tip (processing means) reaches outside the end surface of the steel pipe, the rotational speed of the rotating disk is changed (decelerated or increased). It may be a thing.
7). In the embodiment, the position of the center of gravity of the swinging member that is swingably supported by the rotating disk (tool post) is set on the side opposite to the copying roller across the center of swinging of the swinging member. The oscillating member is oscillated by the centrifugal force accompanying the rotation, and the copying roller is moved in the direction in contact with the outer peripheral surface of the steel pipe, but the supporting member moves linearly with respect to the rotating disk (tool post). It is possible to employ a configuration in which processing means and a copying roller are provided, and the supporting member is moved linearly by the centrifugal force accompanying the rotation of the rotating disk and the copying roller is brought into contact with the outer peripheral surface of the steel pipe via the operating means. .

16 Steel pipe 16a Machining surface 20 Moving means 22 Turntable 24 Drive motor (drive means)
36 Oscillating member (actuating means)
38a First chip (processing means)
42 First copying roller (copying roller)
48 First compression coil spring (biasing means)
51 Restricting member 52a Second chip (processing means)
54 Second copying roller (copying roller)
56 Second compression coil spring (biasing means)
FA ₁ Centrifugal force during processing (centrifugal force)
Centrifugal force when FB _{1 is} released (centrifugal force)
Centrifugal force during FA ₂ processing (centrifugal force)
Centrifugal force when FB _{2 is} released (centrifugal force)
K ₁ Biasing force of first compression coil spring (biasing force of biasing means)
K ₂ Biasing force of the second compression coil spring (biasing force of the biasing means)

Claims (5)

A processing method for processing the end of the steel pipe (16) by turning the processing means (38a, 52a) provided on the rotating disk (22) around the central axis of the steel pipe (16),
Said processing means (38a, 52a) and the centrifugal force caused by the rotation of the turntable so as to move integrally with the copying rollers (42, 54) provided in the (22), said turntable (22) (FA _1, The urging force (K ₁ , K ₂ ) of the urging means (48, 56) that urges the copying roller (42, 54) radially away from the outer peripheral surface of the steel pipe (16) by FA ₂ ). ) Against the outer peripheral surface of the steel pipe (16), the rotary disk (22) is moved forward so as to press the processing means (38a, 52a) against the end of the steel pipe (16). Processed
When the rotary disk (22) that has been processed by the processing means (38a, 52a) is moved backward, before the copying roller (42, 54) reaches the processing surface (16a) of the steel pipe (16). wherein the rotational speed of the rotating disk (22), by reducing to a centrifugal force caused by the rotation (FB _1, FB ₂₎ is smaller than the force (K _1, K ₂₎ with said biasing means (48), said A method for processing an end of a steel pipe, characterized in that the copying rollers (42, 54) are separated from the outer peripheral surface of the steel pipe (16) by the urging forces (K ₁ , K ₂ ) of the urging means (48). When the processing in the processing means (38a, 52a) is completed, the processing means (38a, 52a) moves backward from the end surface of the steel pipe (16) until the rotating disk (22) moves backward, steel pipe according to claim 1, wherein the biasing force (K _1, K ₂₎ centrifugal force than (FB _1, FB ₂₎ was to reduce the rotational speed of the rotating disk (22) until the smaller of the biasing means (48) End processing method. A processing device for processing the end of the steel pipe (16) by turning the processing means (38a, 52a) provided on the rotating disk (22) around the central axis of the steel pipe (16),
Moving means (20) capable of moving the rotating disk (22) in the direction of the central axis of the steel pipe (16);
A copying roller (42, 54) that is rotatable on the rotating disk (22) and is disposed so as to move integrally with the processing means (38a, 52a) and is capable of contacting the outer peripheral surface of the steel pipe (16). )When,
Urging means (48, 56) for urging the copying roller (42, 54) in a direction away from the outer peripheral surface of the steel pipe (16) in the radial direction;
Drive means (24) for rotationally driving the rotating disk (22);
Actuating the centrifugal force caused by the rotation of the rotating disk _{(22) (FA 1, FA} 2, FB 1, FB 2), for moving the scanning roller (42) in contact with a direction on the outer peripheral surface of the steel tube (16) Means (36),
When processing the steel pipe (16), the biasing force (48, 56) of the biasing means (48, 56) so that the copying roller (42) moved by the actuating means (36) contacts the outer peripheral surface of the steel pipe (16) ( K _1, K ₂₎ with rotating from the centrifugal force (FA _1, FA ₂₎ the rotating disk at a rotational speed is increased (22), said processing means (38a, the rotating disk processing at 52a) has been completed (22) when moving the該付force to be separated from the outer peripheral surface of the copying roller (42) is the biasing force of said biasing means (48,56) (K _1, K ₂₎ by steel (16) (K _1, K ₂₎ centrifugal force than (FB _1, FB ₂₎ characterized by being configured as capable of controlling the drive means (24) to rotate the turntable (22) at a rotational speed is reduced Steel pipe end processing equipment. The copying roller (42) is disposed on the front side of the processing means (38a, 52a) in the direction in which the rotating means (22) is close to the end surface of the steel pipe (16) by the moving means (20),
Said processing means (38a, 52a) said rotating disk processing at has completed (22), centrifugal force (FA _1, FA ₂₎ is rotated at a rotational speed greater than the biasing force (K _1, K ₂₎ The processing means (38a, 52a) is moved by the moving means (20) until the processing means (38a, 52a) moves outward from the end surface of the steel pipe (16), and then the copying roller (42, 54) is processed on the processing surface of the steel pipe end ( centrifugal force (FB _1, FB ₂₎ to control said drive means (24) to rotate the turntable (22) at a rotational speed smaller than the biasing force (K _1, K ₂₎ before reaching 16a) The processing apparatus of the steel pipe end part of Claim 3 comprised so that it might do. A regulating member for regulating the position of the copying roller (42, 54) moved by the urging force (K ₁ , K ₂ ) of the urging means (48, 56) at a position away from the outer peripheral surface of the steel pipe (16). 5. The steel pipe end machining apparatus according to claim 3, further comprising (51).

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