JP2023112278A - Vibration control jig, cutting processing device using the same, cutting processing method - Google Patents

Abstract

To provide a vibration control jig that can obtain desired roughness of a machined surface even though an eccentric bar gets longer.SOLUTION: A vibration control jig 6 is used for a cutting processing device that comprises: a surface board that rotates around a rotation axis; a holder fixed to the surface board eccentrically from the rotation axis; an eccentric bar fixed to the holder and having a longitudinal axis extending in parallel to the rotation axis; and a mounting piece in which a cutter is attachably and detachably stores, at a tip of the eccentric bar. Fastening bolts are inserted through first bolt through holes 14 to graso and fix an outer periphery of the eccentric bar. Fixing bolts are inserted through second bolt through holes 18 to fix the vibration control jig in a manner to be extended and connected to an end part of the holder.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to a suitable anti-vibration jig for use in a cutting apparatus using a face plate, a cutting apparatus using the same, and a cutting method.

Patent Literature 1 discloses that an eccentric bar is attached to a face plate that rotates around a rotation axis, and cutting is performed using a cutting tool attached to the tip of the eccentric bar.

Japanese Patent Application Laid-Open No. 2020-97068 (Fig. 2)

In the cutting apparatus disclosed in Patent Document 1, when the object to be processed (work) becomes large, for example, a steam valve body of a steam turbine, the distance from the face plate to the cutting tool becomes long, for example, about 1200 mm. If the distance from the face plate to the cutting tool is increased in this way, the eccentric bar is also elongated, and the cutting tool is likely to vibrate (chatter), making it impossible to ensure the desired machined surface roughness.

The present disclosure has been made in view of such circumstances, and provides an anti-vibration jig capable of obtaining a desired machined surface roughness even if the eccentric bar is elongated, and a cutting apparatus using the same. And it aims at providing the cutting method.

A vibration isolation jig according to an aspect of the present disclosure includes a face plate that rotates around a rotation axis, a holder that is fixed to the face plate eccentrically from the rotation axis, and a holder that is fixed to the holder and holds the An anti-vibration jig for use in a cutting apparatus, comprising an eccentric bar having a longitudinal axis extending parallel to the axis of rotation, and a mounting piece detachably receiving a cutting tool at the tip of the eccentric bar, A gripping portion that grips and fixes the outer circumference of the eccentric bar, and a holder fixing portion that fixes the end portion of the holder so as to be extended and connected are provided.

A cutting apparatus according to an aspect of the present disclosure includes a face plate that rotates around a rotation axis, a holder that is fixed to the face plate eccentrically from the rotation axis, and a holder that is fixed to the holder and rotates. It is provided with an eccentric bar having a longitudinal axis extending parallel to the axis, a mounting piece detachably accommodating a cutting tool at the tip of the eccentric bar, and the anti-vibration jig.

A cutting method according to an aspect of the present disclosure includes a face plate that rotates around a rotation axis, a holder that is eccentrically fixed to the face plate from the rotation axis, and a holder that is fixed to the holder and rotates. A cutting method using a cutting device including an eccentric bar having a longitudinal axis extending parallel to the axis and a mounting piece for detachably accommodating a cutting tool at the tip of the eccentric bar, wherein the eccentric An anti-vibration jig is fixed so as to grip the outer periphery of the bar and to be extendedly connected to the end of the holder, and the cutting tool attached to the mounting piece is used to cut the workpiece.

A desired machined surface roughness can be obtained even if the eccentric bar is elongated.

1 is a perspective view of a horizontal boring machine according to an embodiment of the present disclosure; FIG. FIG. 2 is a perspective view of the anti-vibration jig shown in FIG. 1; 3 is a right side view of the anti-vibration jig shown in FIG. 2; FIG. FIG. 3 is a plan view of the anti-vibration jig shown in FIG. 2; FIG. 3 is a front view of the anti-vibration jig shown in FIG. 2; FIG. 3 is a rear view of the anti-vibration jig shown in FIG. 2; 2 is a longitudinal sectional view showing a state in which the inner diameter of the steam valve main body is machined using the horizontal boring machine shown in FIG. 1; FIG.

An embodiment according to the present disclosure will be described below with reference to the drawings.
FIG. 1 shows the essential parts of a horizontal boring machine (cutting device) 1 .
A main shaft 2 of the horizontal boring machine 1 has a substantially cylindrical shape and rotates around a rotation axis CL1 extending in the Z-axis direction. The main shaft 2 is rotationally driven by an electric motor (not shown). The rotation speed of the spindle 2 is controlled by a control section (not shown). Further, the main shaft 2 can be moved in the Z-axis direction (specifically, in the horizontal direction) as indicated by an arrow A1 by a control unit (not shown).

A face plate 3 is attached and fixed to the tip of the spindle 2 . The face plate 3 has a flat cylindrical outer shape. The center of the face plate 3 is attached so as to match the center of the main shaft 2 . As a result, the face plate 3 rotates about the rotation axis CL1 in the direction of the arrow A2. An eccentric bar 7 is attached to the face plate 3 via a holder 5 and a vibration isolation jig 6 . A groove is formed at the tip of the eccentric bar 7, and a plate-like attachment piece 9 having a carbide tip (cutting tool) 8 attached thereto is fitted and fixed.

The holder 5 is eccentrically fixed to the face plate 3 from the center of the face plate 3 (the position through which the rotation axis CL1 passes). The anti-vibration jig 6 is fixed to the end surface of the tip of the holder 5 so as to be extendedly connected to the holder 5 . The eccentric bar 7 is a round bar, and one end portion (base end portion) of the eccentric bar 7 is inserted into the holder 5 and the anti-vibration jig 6 and fixed. Thereby, the longitudinal axis CL2 of the eccentric bar 7 extends parallel to and offset from the rotation axis CL1. The diameter of the eccentric bar 7 is 50 mm or more and 150 mm or less.

The carbide tip 8 is attached so as to protrude from the tip of the eccentric bar 7 in a direction orthogonal to the longitudinal axis CL2. The cemented carbide tip 8 is exchangeably fixed to the mounting piece 9 .

A base end portion (rear end portion) of the holder 5 is fixed to the slide portion 10 of the face plate 3 . The sliding portion 10 can reciprocate in the radial direction of the face plate 3 (the arrow A3 direction) by a slide mechanism provided on the face plate 3 . The operation of the slide section 10 is controlled by a control section (not shown).

The control unit includes, for example, a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), a computer-readable storage medium, and the like. A series of processes for realizing various functions are stored in a storage medium or the like in the form of a program, for example, and the CPU reads this program to a RAM or the like, and executes information processing and arithmetic processing. As a result, various functions are realized. The program may be pre-installed in a ROM or other storage medium, provided in a state stored in a computer-readable storage medium, or delivered via wired or wireless communication means. etc. may be applied. Computer-readable storage media include magnetic disks, magneto-optical disks, CD-ROMs, DVD-ROMs, semiconductor memories, and the like.

FIG. 2 shows a perspective view of the anti-vibration jig 6. As shown in FIG. The anti-vibration jig 6 is made of an aluminum alloy (for example, A5052) and manufactured by cutting. The weight of the anti-vibration jig 6 is lighter than that made of iron, for example, about 10 kg.

The anti-vibration jig 6 has a longitudinal axis CL3. The longitudinal axis CL3 of the anti-vibration jig 6 coincides with the longitudinal axis CL2 of the eccentric bar 7 when the eccentric bar 7 is attached to the anti-vibration jig 6 (see FIG. 1). The outer shape of the anti-vibration jig 6 is a truncated quadrangular pyramid, tapered so that the cross-sectional area on the side of the tip 6a is smaller than that on the side of the rear end 6b. More specifically, as shown in FIGS. 3 and 4, it has a tapered shape, and the inclination angle α on one side is 1° or more and 3° or less. The dimension of the anti-vibration jig 6 in the direction of the longitudinal axis CL3 is 300 mm or more and 500 mm or less. The cross-sectional shape of the anti-vibration jig 6 is square, as shown in FIGS. One side of the square at the rear end 6b is 100 mm or more and 150 mm or less. However, the cross-sectional shape is not limited to a square, and may be a rectangle (rectangle) having a different aspect ratio.

A substantially cylindrical through-hole 11 centered on the longitudinal axis CL3 is formed in the anti-vibration jig 6 . The through hole 11 is formed continuously from the front end 6a of the anti-vibration jig 6 to the rear end 6b. The cross section of the through hole 11 is arcuate, and has a C shape with a gap 11a formed in a part of the circumference. This gap 11 a is formed continuously up to the upper surface 6 c of the vibration isolation jig 6 . As a result, a slit 12 extending continuously in the direction of the longitudinal axis CL3 from the front end 6a to the rear end 6b of the anti-vibration jig 6 is formed. The slit 12 is positioned substantially at the center in the width direction W of the vibration isolation jig 6 . The diameter of the through hole 11 corresponds to the diameter of the eccentric bar 7 and is set to 50 mm or more and 150 mm or less.

A first bolt through-hole 14 is provided in the upper portion of the anti-vibration jig 6 from the right side 6d to the left side 6e. The first bolt through hole 14 is provided at a position that penetrates the slit 12 perpendicularly. Three first bolt through holes 14 are provided at intervals from the central position of the anti-vibration jig 6 in the direction of the longitudinal axis CL3 to the rear end 6b. The number of the first bolt through holes 14 is not limited to three, and may be two or more, or four or more.

Counterbore portions 16 are formed at respective positions of both end portions of the first bolt through hole 14 . The counterbore portion 16 is formed so as to open to the side surfaces 6d and 6e and the upper surface 6c. A nut to be screwed onto the head of a tightening bolt (not shown) inserted through the first bolt through-hole 14 and the tip of the tightening bolt is arranged in the counterbore portion 16 . As a result, the tightening bolt head and nut do not protrude from the side surfaces 6d, 6e and the top surface 6c.

The vibration isolation jig 6 and the eccentric bar 7 inserted through the through hole 11 are fixed as follows.
After the eccentric bar 7 is inserted through the through hole 11, the tightening bolt is inserted through the through hole 14 for the first bolt and a nut is screwed to the tip to tighten it. As a result, the gap 11a is narrowed, and the inner peripheral surface forming the through hole 11 comes into close contact with the outer periphery of the eccentric bar 7 and is tightened and fixed. Therefore, the grip portion that grips and fixes the outer periphery of the eccentric bar 7 is fixed to the inner peripheral surface of the through hole 11, the gap 11a, the first bolt through hole 14, the tightening bolt, and the tightening bolt. It consists of a nut that

As shown in FIG. 2, a second bolt through hole 18 is formed in the counterbore 16 located on the right side 6d and closest to the rear end 6b. The second bolt through hole 18 is formed to penetrate in the direction of the longitudinal axis CL3.

In FIG. 2, a second bolt through hole 18 is formed on each of the upper surface 6c side and the lower surface 6f side. Further, as shown in FIGS. 3 to 6, a counterbore portion 16 is provided at the central position in the height direction of the left side surface 6e. A second bolt through hole 18 is formed so as to open into the counterbore portion 16 . Therefore, a total of three second bolt through holes 18 are provided. However, the number of second bolt through holes 18 may be two or more, and may be four or more.

The vibration isolation jig 6 and the holder 5 (see FIG. 1) are fixed as follows.
First, the rear end 6b of the anti-vibration jig 6 and the end (front end surface) of the holder 5 are brought into contact with each other. Then, the anti-vibration jig 6 is fixed to the holder 5 by passing a fixing bolt through the second bolt through hole 18 and screwing it into a female screw hole (not shown) formed in the end face of the holder 5 . . Therefore, the holder fixing portion for fixing the anti-vibration jig 6 to the end of the holder 5 so as to be extended and connected is composed of the second bolt through-hole 18 and the fixing bolt.

Next, a cutting method for the horizontal boring machine 1 equipped with the anti-vibration jig 6 described above will be described with reference to FIG. The object to be processed (workpiece) shown in the figure is a steam valve main body 20, which is the body (valve box) of a steam valve used in a steam turbine. This steam valve is a valve in which a steam stop valve and a steam control valve are integrated. The steam valve body 20 is fixed in a stationary state by a fixing jig 22 .

The figure shows a state in which the inner diameter 20a of the steam valve main body 20 between the steam stop valve installation position P1 and the steam control valve installation position P2 is processed. A distance L from the fixing position of the holder 5 to the face plate 3 to the carbide tip 8 is, for example, 1000 mm or more and 1500 mm or less. A predetermined surface roughness is indicated on the drawing for this inner diameter machining. For example, Ra 3.2, Ra 6.3, Ra 12.5, and the like.

The eccentric bar 7 is fixed with its base end inserted through the through hole 11 of the anti-vibration jig 6 and the through hole (not shown) of the holder 5 . Specifically, the rear end of the eccentric bar 7 is fixed within the holder 5 and is tightened by a tightening bolt inserted through the first bolt through hole 14 of the anti-vibration jig 6 . The anti-vibration jig 6 is fixed to the holder 5 so as to be extended and connected by a fixing bolt inserted through the second bolt through hole 18 . A predetermined cemented carbide tip 8 is attached to an attachment piece 9 at the tip of the eccentric bar 7 .

Then, the tip of the eccentric bar 7 is inserted into the steam valve main body 20 from the end side (the left end side in FIG. 7) of the steam stop valve installation position P1 of the steam valve main body 20 . The carbide tip 8 is radially moved by the slide 10 to a predetermined position for cutting the inner diameter 20a. Then, by moving the main shaft 2 in the direction of the longitudinal axis CL2 while rotating the main shaft 2 about the rotation axis CL1 at a predetermined number of revolutions by means of an electric motor according to a command from the control unit, the carbide tip 8 of the eccentric bar 7 cuts the inner diameter 20a. I do.

The effects of the present embodiment described above are as follows.
The anti-vibration jig 6 grips and tightens the outer periphery of the eccentric bar 7 by inserting a tightening bolt through the first bolt through-hole 14 and tightening it, and holds the holder by a fixing bolt inserted through the second bolt through-hole 18 . An extension connection is made to the end of 5 . By integrally fixing the base end portion of the eccentric bar 7 located on the holder 5 side together with the holder 5 by the anti-vibration jig 6, the rigidity of the base end portion of the eccentric bar 7 can be increased. As a result, the tip of the eccentric bar 7 can be prevented from vibrating during machining, and a desired machined surface roughness (eg, Ra 3.2, Ra 6.3, Ra 12.5, etc.) can be obtained. Moreover, since the vibration of the tip of the eccentric bar 7 is suppressed, it is possible to shorten the time required to search for suitable cutting conditions.

The contact force between the outer periphery of the eccentric bar 7 and the inner peripheral surface of the through hole 11 can be increased by applying a load so as to narrow the gap with a tightening bolt passed through the first bolt through hole 14 . As a result, the outer circumference of the eccentric bar 7 can be firmly gripped.

A second bolt through-hole 18 is formed through the rear end 6b of the anti-vibration jig 6 abutting on the end of the holder 5, and a fixing bolt is inserted through the second bolt through-hole 18. I decided to screw it into the screw hole. As a result, the anti-vibration jig 6 can be firmly and integrally fixed to the holder 5 .

Since the transverse cross section of the vibration isolating jig 6 is rectangular, processing is easier than in the case of a cylindrical shape. Also, when placed on the floor, it is safe because it does not roll like a cylindrical shape.

Since the antivibration jig 6 has a tapered shape, the weight can be reduced as compared with the case where the entire antivibration jig 6 has the same cross-sectional area. Further, since the tapered shape is such that the cross-sectional area decreases from the holder 5 side toward the tip side of the eccentric bar 7, interference of the anti-vibration jig 6 with the workpiece during processing can be prevented as much as possible. In addition, the strength against the moment about the fixed point of the holder 5 on the side of the face plate 3 can be increased.

Since the anti-vibration jig 6 is made of an aluminum alloy, it can be made lighter than when iron is used. This facilitates handling and reduces the inertial force when rotating during cutting.

In the above-described embodiment, the explanation is given on the assumption that the inside diameter of the steam valve main body 20 is machined. For example, it can be suitably used for cutting a large-sized structure in which the distance L from the fixed position of the holder 5 to the face plate 3 to the carbide tip 8 is 1000 mm or more and 1500 mm or less.

The anti-vibration jig, the cutting apparatus using the same, and the cutting method described in each of the embodiments described above are grasped, for example, as follows.

A vibration isolator (6) according to an aspect of the present disclosure includes a face plate (3) that rotates around a rotation axis (CL1), and a face plate (3) that is eccentric from the rotation axis (CL1) with respect to the face plate (3). A fixed holder (5), an eccentric bar (7) fixed with respect to said holder (5) and having a longitudinal axis (CL2) extending parallel to said axis of rotation (CL1), said eccentric bar ( A vibration isolation jig (6) used in a cutting apparatus (1), comprising a mounting piece (9) for detachably accommodating a cutting tool (8) at the tip of the eccentric bar (7). ), and a holder fixing part for fixing so as to be extendedly connected to the end of the holder (5).

The anti-vibration jig grips and tightens the outer periphery of the eccentric bar by the gripping portion, and is extended and connected to the end portion of the holder by the holder fixing portion. By fixing the base end portion of the eccentric bar positioned on the holder side together with the holder by the anti-vibration jig in this manner, the rigidity of the base end portion of the eccentric bar can be increased. As a result, the tip of the eccentric bar can be prevented from vibrating during machining, and a desired machined surface roughness can be obtained. Also, since the vibration of the tip of the eccentric bar is suppressed, it is possible to shorten the time required to search for suitable cutting conditions.

In the anti-vibration jig (6) according to one aspect of the present disclosure, the gripping portion is in contact with the outer periphery of the eccentric bar (7), and a gap (11a) is formed partially in the circumferential direction. and a tightening portion that tightens the inner peripheral surface against the eccentric bar (7) by applying a load to narrow the gap (11a). ing.

By applying a load so as to narrow the gap by the tightening portion, it is possible to increase the contact force between the outer circumference and the inner circumference of the eccentric bar. As a result, the outer circumference of the eccentric bar can be firmly gripped.

In the anti-vibration jig (6) according to one aspect of the present disclosure, the holder fixing portion penetrates an end surface (6b) that abuts against the end portion of the holder (5), and the holder ( 5) is provided with a fixing bolt to be screwed into the female threaded hole.

The anti-vibration jig can be fixed to the holder by inserting a fixing bolt so as to penetrate the end surface of the holder that abuts on the end of the holder and screwing it into the female screw hole of the holder. The number of fixing bolts is preferably two or more.

The anti-vibration jig (6) according to one aspect of the present disclosure has a rectangular cross-section, and the cross-sectional area decreases from the holder (5) side toward the tip side of the eccentric bar (7). It has a tapered shape.

Since the cross section is rectangular, processing is easier than in the case of a cylindrical shape. Also, when placed on the floor, it is safe because it does not roll like a cylindrical shape.
Since it is tapered, the weight can be reduced as compared with the case where the entire vibration isolation jig has the same cross-sectional area. In addition, since the tapered shape is such that the cross-sectional area decreases from the holder side toward the tip side of the eccentric bar, it is possible to prevent the anti-vibration jig from interfering with the workpiece during machining. It is possible to increase the strength against the moment centered on the fixing point on the faceplate side.

The anti-vibration jig (6) according to one aspect of the present disclosure is made of aluminum alloy.

Since it is made of aluminum alloy, it can be lighter than when using iron. This facilitates handling and reduces the inertial force when rotating during cutting.

A cutting device (1) according to an aspect of the present disclosure includes a face plate (3) that rotates around a rotation axis (CL1), and is fixed to the face plate (3) eccentrically from the rotation axis (CL1). an eccentric bar (7) fixed to said holder (5) and having a longitudinal axis (CL2) extending parallel to said axis of rotation (CL1); said eccentric bar (7 ), a mounting piece (9) for detachably accommodating a cutting tool (8), and any one of the anti-vibration jigs (6) described above.

A cutting method according to an aspect of the present disclosure includes a face plate (3) that rotates around a rotation axis (CL1), and a holder that is eccentrically fixed to the face plate (3) from the rotation axis (CL1). (5), an eccentric bar (7) fixed to said holder (5) and having a longitudinal axis (CL2) extending parallel to said axis of rotation (CL1), and a tip of said eccentric bar (7). A cutting method using a cutting device (1) provided with a mounting piece (9) that detachably accommodates a cutting tool (8), wherein the outer circumference of the eccentric bar (7) is gripped, and , a vibration isolation jig (6) is fixed so as to be extendedly connected to the end of the holder (5), and the workpiece (20) is mounted using the cutting tool (8) attached to the mounting piece (9). cutting.

1 Horizontal boring machine (cutting device)
2 Spindle 3 Face plate 5 Holder 6 Anti-vibration jig 6a Tip 6b Rear end 6c Upper surface 6d Right side 6e Left side 6f Lower surface 7 Eccentric bar 8 Carbide tip (cutting tool)
9 Mounting piece 10 Sliding part 11 Through hole 11a Gap (holding part)
12 Slit 14 First bolt through hole (holding part)
16 counterbore 18 second bolt through hole (holder fixing part)
20 Steam valve main body 20a Inner diameter 22 Fixing jig CL1 Rotational axis CL2 (Eccentric bar) Longitudinal axis CL3 (Vibration isolation jig) Longitudinal axis P1 Steam stop valve installation position P2 Steam control valve installation position L Distance

Claims (7)

a face plate that rotates around the axis of rotation;
a holder eccentrically fixed to the face plate from the rotation axis;
an eccentric bar fixed with respect to the holder and having a longitudinal axis extending parallel to the axis of rotation;
a mounting piece that detachably accommodates a cutting tool at the tip of the eccentric bar;
A vibration isolation jig used in a cutting device comprising
A vibration isolating jig comprising: a grip part for gripping and fixing the outer circumference of the eccentric bar; and a holder fixing part for fixing the end part of the holder so as to be extended and connected. The gripping portion has an inner peripheral surface that is in contact with the outer periphery of the eccentric bar and has an arcuate cross section formed by forming a gap in a part of the circumferential direction;
a tightening portion that tightens the inner peripheral surface against the eccentric bar by applying a load to narrow the gap;
The anti-vibration jig according to claim 1, comprising: 3. The holder fixing portion includes a fixing bolt that passes through an end face that abuts against the end portion of the holder and that is screwed into a female screw hole formed in the holder. Anti-vibration jig described in . 4. The anti-vibration jig according to any one of claims 1 to 3, wherein the cross section is rectangular and tapered such that the cross section area decreases from the holder side to the tip end side of the eccentric bar. . 5. The anti-vibration jig according to any one of claims 1 to 4, wherein the jig is made of an aluminum alloy. a face plate that rotates around the axis of rotation;
a holder eccentrically fixed to the face plate from the rotation axis;
an eccentric bar fixed with respect to the holder and having a longitudinal axis extending parallel to the axis of rotation;
a mounting piece that detachably accommodates a cutting tool at the tip of the eccentric bar;
A vibration isolation jig according to any one of claims 1 to 5;
Cutting equipment with a face plate that rotates around the axis of rotation;
a holder eccentrically fixed to the face plate from the rotation axis;
an eccentric bar fixed with respect to the holder and having a longitudinal axis extending parallel to the axis of rotation;
a mounting piece that detachably accommodates a cutting tool at the tip of the eccentric bar;
A cutting method using a cutting device comprising
fixing a vibration isolation jig so as to grip the outer periphery of the eccentric bar and extend and connect to the end of the holder;
A cutting method for cutting a workpiece using the cutting tool attached to the attachment piece.