JPH05169B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a non-circular inner peripheral surface polishing apparatus for polishing an elliptical inner peripheral surface of, for example, an elliptical cylinder.

(Prior Art) Conventionally, a non-circular inner peripheral surface polishing device for polishing or grinding an elliptical inner peripheral surface of an elliptical cylinder, etc., has a cylinder fixing jig 5 as shown in FIG.
1, and while rotating the cylinder fixing jig 51 in the direction of arrow F at several tens of rpm,
A cylindrical whetstone 54 whose outer diameter corresponds to the curvature of the inner circumferential surface 53 is brought into contact with the inner circumferential surface 53 while rotating at several thousand rpm, and the inner circumferential surface 53 is polished with the same whetstone 54. It is equipped with a motor 55 with the required output to rotate the grindstone 54 at several 1000 rpm,
The output shaft 56 of the motor 55 and the central axis of the grindstone 54 are connected, and the cylinder 52 is
A moving device 57 is provided for integrally reciprocating the grindstone 54 and the motor 55 in the X direction in the drawing in accordance with the curved shape of the elliptical inner peripheral surface 53.

Further, in order to prevent uneven wear of the grindstone 54 as necessary, a moving device 58 for reciprocating the grindstone 54 by a minute distance in the Z direction in the drawing is provided with the motor 55 mounted thereon.

(Problems to be Solved by the Invention) According to the conventional non-circular inner peripheral surface polishing device described above, the motor 55 for rotating the grindstone 54 and the motor 55 and the grindstone 54 are integrated in the X direction. Since it is necessary to provide at least two types of drive systems, including the moving device 57, which is equipped with, for example, a hydraulic cylinder for reciprocating the surface, the mechanism of the non-circular inner peripheral surface polishing device itself is complicated and expensive. There was a problem.

On the other hand, from the viewpoint of polishing time, since the comparatively heavy motor 55 is mounted, the amount of load on the moving device 57 becomes large, and there is a limit to increasing the reciprocating speed in the X direction shown in the figure. If the rotational speed of the cylinder fixing jig 51 is increased to, for example, several hundred rpm, the grindstone 54 will no longer be able to press against the elliptical circumferential surface. Therefore, there was a problem in that it was extremely difficult to increase the rotation speed of the cylinder fixing jig 51 from several tens of rpm to several hundreds of rpm to shorten the polishing time.

Therefore, in the present invention, by making the polishing body for polishing the non-circular inner peripheral surface of a rotating elliptical cylinder or the like non-rotating, the holding mechanism for holding the polishing body is simplified. By reducing the load on the moving device for integrally reciprocating the polishing body with the holding mechanism so as to bring the polishing body into pressure contact with the non-circular inner circumferential surface, and by increasing the reciprocating speed of the moving device, the elliptical cylinder, etc. An object of the present invention is to provide a polishing device for a non-circular inner circumferential surface, which enables a polishing body to press against and follow a non-circular inner circumferential surface even when the rotational speed of the non-circular inner circumferential surface is increased, and which can be formed in a short polishing time and at low cost. This is a technical issue that should be addressed.

(Means for Solving the Problems) The technical means for solving the above problems is to press a non-circular inner peripheral surface polishing device against the non-circular inner peripheral surface of a member to be polished that is rotated at a predetermined number of rotations. a polishing body; a holding means for holding the polishing body; an elastic member for uniformly pressing the polishing body against the non-circular inner peripheral surface; and a moving means for reciprocating the abrasive body in a direction that corresponds to the shape of the non-circular inner circumferential surface of the member to be polished so as to bring the abrasive body into continuous contact with the non-circular inner circumferential surface. That's true.

(Function) According to the non-circular circumferential surface polishing device having the above configuration, when the member to be polished on which the non-circular inner circumferential surface is formed is rotated at a predetermined number of rotations, the moving means moves to the number of rotations of the member to be polished. so that the abrasive body held by the holding means is brought into continuous contact with the non-circular inner circumferential surface in accordance with
The holding means is moved back and forth. At this time, the elastic member acts to uniformly press the polishing body against the non-circular inner circumferential surface, polishing the non-circular inner circumferential surface and removing undulations on the inner circumferential surface.

(Example) Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective external view of a first embodiment of a non-circular circumferential surface polishing apparatus. As shown in FIG. 1, an elliptical cylinder 2 used, for example, in a compressor is attached to a cylinder fixing jig 1 attached to the tip of a rotating spindle (not shown), and the cylinder 2 is connected to the rotation of the rotating spindle. For example, it is rotated at a rotation speed of 300 rpm. The inner peripheral surface of the cylinder 2 is formed into an elliptical shape by milling, and since the inner peripheral surface has undulations caused by the milling, the undulations are polished and removed using a circular inner peripheral surface polishing device. It is something.

Reference numeral 3 denotes a grindstone that is continuously brought into contact with the inner circumferential surface of the cylinder 2, that is, in the X direction in the drawing, when the cylinder 2 is in a rotating state, and is further pressed by springs 6, 6, which will be described later, to polish the undulations. , the shape of the tip that contacts the inner circumferential surface of the cylinder 2 is
It is formed in the shape of the envelope of the inner peripheral surface drawn when it is in a rotating state, or a shape close to it. Grindstone 3 is the second
As shown in the figure, it is fixed to the whetstone holder 4,
The grindstone holder 4 is slidably inserted into the distal end portion 5A of the fixed arm 5 with the left and right end surfaces of the holder 4 in the drawing position. The grindstone holder 4 is biased in the direction of the inner circumferential surface of the cylinder 2, that is, in the X direction in the drawing, by springs 6, 6, which are elastically attached between the holder 4 and the inner end surface of the tip 5A of the fixed arm 5. .

As shown in FIG. 1, the proximal end 5 of the fixed arm 5
B is held by a fixed arm holder 7 and tightened with fixing screws 8, 8. The fixed arm holding stand 7 is inserted into a slide base 9, and is slid against the slide base 9 in the X direction shown in the figure, that is, in the direction in which the grindstone 3 is brought into continuous contact with the inner circumferential surface of the cylinder 2. It is movably mounted, and the slide base 9 is placed and fixed on a base 10. A hydraulic cylinder 11 is attached to the base 10 for reciprocating the fixed arm holder 7 on the slide base 9 in the X direction shown in the figure, and the output shaft 12 of the hydraulic cylinder 11 is connected to the end surface of the fixed arm holder 7. is combined with

FIG. 3 is a control block diagram for controlling the non-circular inner peripheral surface polishing apparatus shown in FIG. 1.

As shown in the figure, a computer 21 is provided as a control center, and the computer 21 has a built-in storage section 22 in which control programs and the like are stored. A D/A converter 23 is connected to the output side of the computer 21, and a servo amplifier 24 is connected to the output side of the D/A converter 23 to input the analog signal D/A converted by the converter 23. connected,
The servo amplifier 24 outputs a drive voltage corresponding to the control digital signal to the servo valve 25. When the drive voltage is inputted to the servo valve 25, the opening degree is controlled according to the polarity and magnitude of the drive voltage.

A hydraulic source 26 that supplies hydraulic oil to the hydraulic cylinder 11 is connected to the servo valve 25, and the servo valve 25, the hydraulic cylinder 11, and the hydraulic source 2
6 form a hydraulic circuit. When the servo valve 25 is controlled, hydraulic oil is supplied from the hydraulic source 26 to the hydraulic cylinder 11 according to the opening degree of the servo valve 25, and the output shaft 12 of the hydraulic cylinder 11 is supplied with hydraulic oil.
is reciprocated in the X direction shown in the figure. As the output shaft 12 reciprocates, the fixed arm holder 7 coupled to the output shaft 12 slides onto the slide base 9, and the fixed arm 5 fixed to the fixed arm holder 7 and the grindstone holder 4 and the grindstone 3 are integrally reciprocated.

Further, as shown in FIG. 3, a movable portion of a differential transformer 27 is coupled to the output shaft 12, and the output shaft
A signal corresponding to the position of the output shaft 12 accompanying the reciprocating movement of the hydraulic cylinder 12 is fed back from the differential transformer 27 to the input side of the servo amplifier 24, and the hydraulic cylinder 11 is automatically controlled to match the target position.

On the other hand, when the cylinder fixing jig 1 at the tip of the rotating spindle (not shown) rotates, a rotary encoder 28 is attached that outputs a pulse signal corresponding to the rotational speed of the rotating spindle, and the pulse signal is sent to the computer 21. The rotation angle of the cylinder 2 is outputted and the rotation angle of the cylinder 2 is recognized.

With the control configuration described above, the computer 2
1 rotates the rotating main shaft (not shown) in the direction of arrow F, for example, 300 r., according to the built-in control program.
By rotating the hydraulic cylinder 11 at a rotational speed of pm, rotating the cylinder 2, and controlling the servo valve 25 to reciprocate the output shaft 12 of the hydraulic cylinder 11,
The grindstone 3 is reciprocated in the X direction shown in the figure so as to follow the shape of the elliptical inner peripheral surface of the cylinder 2 in a rotating state, that is, to continuously contact the same inner peripheral surface,
In addition, due to the elasticity of the springs 6, 6, the grinding wheel 3
To uniformly and reliably press the inner peripheral surface of a cylinder 2. As a result, the so-called undulations on the elliptical inner circumferential surface of the cylinder 2 that were generated during milling are polished and removed.

Furthermore, by providing a micro-movement means for slightly moving the base 10 in the Z direction shown in FIG. 1 to prevent uneven wear of the grindstone 3, a finish with even higher precision can be achieved.

Next, a second embodiment will be described based on FIG.

In the second embodiment, a cylinder 2 similar to that of the first embodiment is attached to a cylinder fixing jig 1, and the rotating main shaft (not shown) is moved in the direction of arrow F as in the first embodiment.
The cylindrical grindstone 31 is rotated at 300rpm.
This polishes the so-called undulations on the elliptical inner circumferential surface of the cylinder 2. The grindstone 31 is attached to the tip of an arm 32, and the base end of the arm 32 is held by an arm holder 33. The arm holder 33 holds the base end of the arm 32, and springs 34, 34 are provided between the end face of the base end of the arm 32 and the inner end face of the arm holder 33.
The grindstone 31 and the arm 32 are integrally urged toward the elliptical inner peripheral surface of the cylinder 2.

The arm holder 33 is placed and fixed on the upper surface of a slide plate 35 that is reciprocated in the X direction shown in the figure.
The slide plate 35 is formed to slide on a slide base 36 in the X direction in the drawing. The slide base 36 is attached to the upper surface of a base 10 formed in the same manner as in the first embodiment, and the hydraulic cylinder 11 is attached to the upper surface of the base 10 in the same manner as in the first embodiment. The output shaft 12 of the hydraulic cylinder 11 is connected to a slide plate 35, and the first
Similarly to the embodiment, the computer 21 shown in FIG.
The servo valve 25 is controlled by the hydraulic cylinder 1.
When hydraulic oil is supplied to the cylinder 1, the slide plate 35 is reciprocated in the X direction shown in the figure, and the arm holder 33 is also reciprocated in the same direction, so that the cylinder 2 in the rotating state
The grindstone 31 is moved along the shape of the elliptical inner peripheral surface. As a result, the springs 34, 34
Together with the urging force of , the undulations of the elliptical inner circumferential surface of the cylinder 2 are polished.

Incidentally, as in the first embodiment, uneven wear of the grindstone 31 can be prevented by providing a moving means for slightly moving the base 10 in the Z direction in the drawing.

Next, a third embodiment will be described with reference to FIGS. 5 and 6.

In the third embodiment, the cylinder fixing jig 1, the cylinder 2 attached to the cylinder fixing jig 1, the fixed arm holding base 7, the slide base 9, the base 10, the hydraulic cylinder 11, etc. in the first embodiment are the same. The arrangement is similar to that of the first embodiment, and the cylinder 2 is rotated in the direction of arrow B at, for example, 300 rpm. In the third embodiment, the polishing body 41 for polishing the elliptical inner peripheral surface of the cylinder 2 is formed in the shape of a flap wheel, as shown in detail in FIG.
The flap wheel itself is made elastic so that it can play the role of the springs 6, 6 in the first embodiment.

The polishing body 41 is a flap made of cloth or paper with abrasive grains adhered to the surface thereof, and the polishing body 41 is fixed to the tip of the arm 42. Further, the base end portion of the arm 42 is held by the fixed arm holder 7, as in the first embodiment, and is tightened with fixing screws 8, 8. As in the first embodiment, the servo valve 25 is controlled by the computer 21 shown in FIG. 3, hydraulic oil is supplied to the hydraulic cylinder 11, and the output shaft 12 of the hydraulic cylinder 11 is reciprocated in the Then, the fixed arm holder 7 coupled to the output shaft 12 slides on the upper surface of the slide base 9, and the fixed arm holder 7
An arm 42 fixed to is reciprocated together with the polishing body 41, and the inner peripheral surface of the rotating cylinder 2 is polished by the polishing body 41 to remove undulations.

Note that, similarly to the first embodiment, a moving means for slightly moving the base 10 in the Z direction shown in the figure is provided to move the polishing body 41.
It is also possible to prevent uneven wear in the axial direction. Further, by periodically rotating the arm 42 little by little, uneven wear of the polishing body 41 in the circumferential direction can be prevented.

(Effects of the Invention) As described above, according to the present invention, a polishing body that presses against the non-circular inner circumferential surface of a rotating member to be polished, such as an elliptical cylinder, and polishes the inner circumferential surface, is By making the holding mechanism that holds the polishing body rotary and having a simple and lightweight structure, the amount of load on the moving device that integrally moves the polishing body and the holding mechanism back and forth is reduced and the speed of reciprocating movement is increased. As a result, even when the rotational speed of the member to be polished is increased, the polishing body can be pressed against the circular inner circumferential surface to be polished, and polishing is faster than in conventional non-circular inner circumferential surface polishing devices. This has the effect of shortening the time.

Further, by making the holding mechanism simple and lightweight, there is an effect that the non-circular inner peripheral surface polishing device can be manufactured at low cost.

[Brief explanation of the drawing]

Fig. 1 is a perspective external view of the first embodiment of the present invention, Fig. 2 is a partially detailed sectional view of Fig. 1, Fig. 3 is a control block diagram of the embodiment, and Fig. 4 is a perspective view of the second embodiment. 5 is a perspective external view of the third embodiment, FIG. 6 is a partial detail view of FIG. 5, and FIG. 7 is a perspective external view of a conventional non-circular inner peripheral surface polishing device. 1... Cylinder fixing jig, 2... Cylinder,
3, 31...Whetstone, 4...Whetstone holder, 5...Fixed arm, 6,34...Spring, 7...Fixed arm holder, 9...Slide base, 10...
Base, 11... Hydraulic cylinder, 12... Output shaft,
21...Computer, 22...Storage unit, 25...
...servo valve, 26...hydraulic source, 32, 42...arm, 41...polishing body.

Claims (1)

[Claims] 1. A polishing body that is pressed against the non-circular inner circumferential surface of a member to be polished that is rotated at a predetermined number of rotations, a holding means that holds the polishing body, and a holding means that holds the polishing body uniformly on the non-circular inner circumferential surface of the member to be polished. an elastic member for press contact, supporting the holding means, and continuously bringing the abrasive body into contact with the non-circular inner circumferential surface of the rotating member in accordance with the shape of the non-circular inner circumferential surface of the member to be polished; and a moving means for reciprocating the polishing body in a direction in which the polishing body is rotated.