JP3885908B2 - Piston ring processing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a piston ring processing machine that simultaneously processes inner and outer peripheral surfaces of a piston ring.
[0002]
[Prior art]
In a conventional piston ring processing machine that processes the inner and outer peripheral surfaces of a piston ring, a plurality of piston ring materials (work pieces) are stacked, both ends of the work are clamped by work support means, and the work is passed through the work support means. The method of machining the inner and outer peripheral surfaces of the workpiece while rotating the workpiece is generally adopted. During machining of the workpiece, it is necessary to clamp both ends of the workpiece with a large clamping force so that the workpiece does not fall apart due to cutting force or centrifugal force is there.
[0003]
For this reason, the work support means of the piston ring processing machine requires a rotating mechanism that can withstand a large clamping force.
[0004]
On the other hand, the clamping device of the piston ring processing machine is described in, for example, Japanese Patent Application Laid-Open No. 63-89201, Japanese Patent Application Laid-Open No. 6-707, Japanese Utility Model Laid-Open No. 56-160701 (Japanese Utility Model Publication No. 60-29362). Are known.
[0005]
The work clamping device described in Japanese Patent Application Laid-Open No. 63-89201 is a work spindle that clamps both ends of a work and is rotatably supported by a conical roller bearing. The work force is supported by a conical roller bearing. It is configured as follows.
[0006]
Japanese Patent Application Laid-Open No. 6-707 discloses that the inner peripheral surface of the material is chucked by the above-mentioned sector shape by attaching a plurality of divided sector shapes to the chuck claws and moving the chuck claws radially outward. A chucking method is described.
[0007]
Further, in Japanese Utility Model Publication No. 56-160701 (Japanese Utility Model Publication No. 60-29362), the main shaft is rotated with a piston ring clamped between a receiving shoulder and a pressing shoulder pressed by a clamp cylinder, and a tool is used. A piston ring processing apparatus is described which processes the outer peripheral surface of the piston ring.
[0008]
[Problems to be solved by the invention]
However, the clamping device disclosed in Japanese Patent Laid-Open No. 63-89201 has a structure in which the support base is moved in the axial direction of the work to clamp both ends of the work. In addition to increasing the height, it is necessary to press the support base in the clamping direction with a large clamp means, which causes a problem that the work support device becomes large and expensive.
[0009]
In addition, because the workpiece is driven to rotate by rotating the spindle that contacts the one end of the workpiece, the workpiece will be out of phase due to rotational fluctuations of the support means that supports both ends of the workpiece, and high-precision machining cannot be performed. There are also defects.
[0010]
On the other hand, in the chucking method described in Japanese Patent Laid-Open No. 6-707, since the outer peripheral surface of the material is processed by supporting the material from the inside with a plurality of fan-shaped members, the inner and outer peripheral surfaces of the material are processed simultaneously. In addition, when processing a non-circular material, it is necessary to produce a sectoral shape according to the shape of the material. Therefore, there is a problem that a sectoral employment is required for the type of material shape and the cost is increased.
[0011]
In the piston ring processing apparatus disclosed in Japanese Utility Model Publication No. 56-160701, the piston ring is clamped between the receiving shoulder and the pushing shoulder, and the outer peripheral surface of the piston ring is undercut. Cannot be processed at the same time, and because the configuration is such that the piston ring is fixed and the tool is rotated to process, when machining a non-circular workpiece, the position control of the tool is complicated and high-precision machining is difficult. There are also problems such as.
[0012]
Moreover, in the case of processing only the outer peripheral surface of the workpiece as in the above Japanese Patent Application Laid-Open No. 6-707 and Japanese Utility Model Laid-Open No. 56-160701, after processing the outer peripheral surface of the workpiece, the inner peripheral surface by another machine. Therefore, it takes a lot of time to process and the productivity is poor, and the inner and outer circumferences are processed in a separate process, so the concentricity of the inner and outer circumferences is lost and a highly accurate piston ring is obtained. There are also problems such as not.
[0013]
The present invention was made to improve the above-described conventional problems, and an object thereof is to provide a piston ring processing machine that enables high-precision processing by strongly clamping a plurality of stacked workpieces. To do.
[0014]
[Means for solving the problems and effects]
In order to achieve the above object, the invention according to claim 1 is a piston ring processing machine for simultaneously processing the inner and outer peripheral surfaces of a work having inner and outer peripheral surfaces formed by non-circular curves.
A workpiece support means having a pair of spindles for rotatably supporting a plurality of stacked workpieces from both end sides;
A Z-axis slide that houses the pair of workpiece support means;
Provided on at least one of said workpiece support means, and by pressurizing the spindle in the axial direction of the workpiece, the clamping means for clamping the workpiece between each spindle,
Z-axis drive means having an NC-controlled Z-axis motor for moving the Z-axis slide in the Z-axis direction parallel to the workpiece axis ;
C-axis drive means having a C-axis motor controlled by NC for driving both of the spindles ;
The NC apparatus is configured by an NC device that operates in synchronization with the movement of the Z-axis slide of the Z-axis slide by the Z-axis driving means and the rotation of the spindles by the C-axis driving means .
[0015]
With the above configuration, the inner and outer peripheries of the workpiece can be machined with high accuracy at the same time, so that productivity is improved and unmanned operation is possible through automatic operation by NC control, so that labor costs can be greatly reduced. .
[0016]
Further, since the machining accuracy is improved, the machining allowance in the next process is reduced, so that the machining time can be shortened and the productivity can be improved accordingly.
In addition, since the workpiece support means is housed in a highly rigid Z-axis slide, and the workpiece support means can firmly clamp the workpiece from both ends, a large cutting reaction force is required when simultaneously machining the inner and outer periphery of the workpiece. Even if it acts on the work support means, the position of the work does not shift, so that highly accurate machining is possible.
[0017]
In order to achieve the above object, the invention according to claim 2 is a box-type structure in which a Z-axis slide is provided with a support column at a corner.
[0019]
With the above configuration, since the clamping force when supporting the workpiece is evenly supported by the support provided at the corner of the Z-axis slide, the parallelism of the workpiece support surface of each workpiece support means is lost due to the offset load. This makes it possible to perform highly accurate machining and improve the rigidity of the Z-axis slide, thereby reducing the size of the work support means, so that the cost of the work support means can be reduced. Become.
[0020]
In order to achieve the above object, the invention as set forth in claim 3 is directed to a Z-axis drive means, a linear guide rail that supports a Z-axis slide so as to be movable in the Z-axis direction, and a ball screw shaft that is rotated forward and backward by a Z-axis motor. It consists of more.
[0021]
With the above configuration, the Z-axis slide can be accurately moved in the Z-axis direction in synchronization with the C-axis driving means.
[0022]
In order to achieve the above object, a fourth aspect of the present invention is such that a flywheel is connected to the C-axis motor of the C-axis drive means.
[0023]
With the above-described configuration, the influence of load fluctuations during machining is canceled and the rotation of the C-axis motor is stabilized, so that the workpiece machining accuracy is further improved.
[0024]
In order to achieve the above object, the invention as set forth in claim 5 is characterized in that the clamping means is a hydraulic clamping means for pressurizing the spindle by a hydraulic cylinder provided on at least one of the workpiece supporting means.
[0025]
With the above configuration, a large clamping force can be easily obtained with a small clamping means.
[0026]
In order to achieve the above object, a sixth aspect of the present invention is such that a hydraulic circuit for selectively supplying high pressure and low pressure is connected to a hydraulic cylinder provided in the work support means.
[0027]
With the above configuration, a large clamping force can be easily obtained when machining a workpiece, and a small clamping force can be easily obtained when checking a machining program.
[0028]
In order to achieve the above object, the invention according to claim 7 is provided with a thrust bearing for supporting a clamping force at a high pressure and a thrust bearing for supporting a clamping force at a low pressure, on a work supporting means provided with a hydraulic cylinder. It is a thing.
[0029]
With the above configuration, large clamping force can be carried by a large thrust bearing and small clamping force can be carried by a small thrust bearing, eliminating problems such as excessively shortening the life of the thrust bearing due to excessive clamping force. can do.
[0030]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described in detail with reference to the drawings.
In the figure, reference numeral 1 denotes a processing machine main body. A column 1b is installed on a bed 1a, and a Z-axis slide 2 which is movable in the vertical movement direction (Z-axis direction) by a Z-axis driving means 3 is provided on the front side of the column 1b. It has been.
The Z-axis slide 2 has a box-like structure in which posts 2a are arranged at corners, and is supported by a guide rail 1c made of a ball-type linear guide laid in the Z-axis direction on the front surface of the column 1b. At the same time, it is moved up and down by a Z-axis motor 4 comprising an NC-controlled servomotor installed at the top of the column 1b.
[0031]
That is, a screw shaft 5 made of a ball screw is connected to the rotary shaft 4a of the Z-axis motor 4 as shown in FIG. 4, and a nut member 5a fixed to the Z-axis slide 2 is screwed to the screw shaft 5. The Z-axis slide 4 can be moved up and down along the guide rail 1c by rotating it forward and backward with the screw shaft 5 by the Z-axis motor 4, and a wire is placed above the Z-axis slide 2. One end of the rope 6 such as a rope is bound.
The intermediate portion of the rope 6 is circumvented by the pulley 7 rotatably supported on the column 1b, and the other end of the rope 6 is provided with a counterweight 8 provided on the rear side of the column 1b. The Z-axis slide 2 can be moved up and down by a small-capacity Z-axis motor 4.
[0032]
The Z-axis slide 2 is provided with an upper work support means 10 and a lower work support means 11 that are spaced apart in the vertical direction.
As shown in FIG. 5, the upper work support means 10 is provided below the hydraulic cylinder 12 provided at the upper part of the Z-axis slide 2, and below the piston 12 a accommodated in the upper part of the hydraulic cylinder 12. And an upper spindle 10a.
[0033]
The upper spindle 10a has a cylindrical shape, and is supported by a lower portion of the hydraulic cylinder 12 through a plurality of bearings 13 so as to be movable up and down and rotatable, and is a ring fitted to the outer peripheral portion of the upper spindle 10a. The lower surface side of the piston 12a is brought into contact with the upper surface of the hydraulic cylinder 10b via a thrust bearing 14, and the hydraulic pressure is supplied to the hydraulic chamber 12b of the hydraulic cylinder 12 so that the upper spindle 10a is moved through the piston 12a. For example, the pressure can be increased downward by, for example, 10 tons.
[0034]
A fixed shaft 10 c whose upper end is fixed to the upper surface of the hydraulic cylinder 12 is provided at the center of the hydraulic cylinder 12.
The lower end side of the fixed shaft 10c passes through the piston 12a and reaches the center portion of the upper spindle 10a. On the spring seat 10d provided at the lower end portion, a thrust bearing 14a smaller than the thrust bearing 14 is provided. A plurality of return springs 10e for urging the upper spindle 10a in the unclamping direction are provided.
[0035]
The hydraulic chamber 12b of the hydraulic cylinder 12 can be supplied with higher and lower hydraulic pressures than the hydraulic circuit shown in FIG.
That is, between the hydraulic pressure source 40 and the hydraulic pressure chamber 12b, the electromagnetic valve 41 that supplies the high pressure from the hydraulic pressure source 40 to the hydraulic pressure chamber 12b and the high pressure from the hydraulic pressure source 40 are partially relieved to relieve the pressure. When the workpiece 16 is machined, a high pressure is applied to the hydraulic chamber 12b, and when the workpiece 16 is operated without being clamped, such as program check, the pilot relief valve 42 is provided. The low pressure set by the relief valve 42 can be supplied to the hydraulic pressure chamber 12b.
[0036]
In FIG. 10, reference numeral 43 denotes clamp detection means including a limit switch for detecting clamping and unclamping of the workpiece 16. Separately from the clamp detection means 43, the pressure in the hydraulic chamber 12 b is detected by a pressure switch. Clamp detection means 44 for detecting clamping and unclamping of the workpiece 16 is also provided.
[0037]
An upper clamp head 10f for clamping the workpiece 16 between lower clamp heads 11f provided on the lower workpiece support means 11 is provided at the lower portion of the upper spindle 10a, and an outer peripheral portion of the upper spindle 10a is The driven gear 18b of the gear train 18a constituting the C-axis drive means 18 is keyed.
As shown in FIG. 4, the C-axis drive means 18 has a C-axis motor 19 made of an NC-controlled servo motor at the top of the column 1b. The C-axis motor 19 is connected to the input shaft 20a of the speed reducer 20. It is connected.
[0038]
The input shaft 20a is provided with a flywheel 20b that stabilizes rotation so as not to cause uneven rotation of the workpiece 16 during processing, and the reduction ratio of the speed reducer 20 does not generate a decimal point in the internal unit of the NC device. Thus, the absolute command of the C-axis motor 19 is set in advance to be 360 ° with respect to one rotation of the workpiece.
The output shaft 20c of the speed reducer 20 is spline-engaged with the upper end of a drive shaft 18c made of a spline shaft, so that the drive shaft 18c can be rotated forward and backward by the C-axis motor 19 via the speed reducer 20. ing.
[0039]
The drive shaft 18c is rotatably supported in the vertical direction so as to be parallel to the axis of the workpiece 16, and the gear trains 18a provided in the upper workpiece support means 10 and the lower workpiece support means 11 respectively at the intermediate portion and the lower end portion. The drive gear 18d is spline engaged.
These drive gears 18d are engaged with driven gears 10b provided on the outer peripheral portion of the upper spindle 10a and the outer peripheral portion of the lower spindle 11a via an intermediate gear 18e, and the drive shaft 18c and the gear train 18a are connected by the C-axis motor 19. Thus, the upper spindle 10a and the lower spindle 11a can be synchronously rotated in the same direction.
[0040]
The lower spindle 11a is also formed in a cylindrical shape like the upper spindle 10a, and is rotatably supported on the Z-axis slide 2 side via a bearing 21, and the Z-axis slide 2 and the lower spindle 11a A thrust bearing 22 is interposed between the driven gear 18b keyed to the outer periphery.
A clamp head 11f that clamps the workpiece 16 between the upper clamp head 10f attached to the upper spindle 10a is provided above the lower spindle 11a.
[0041]
When the upper spindle 10a and the lower spindle 11a are driven to rotate synchronously by the C-axis motor 19, rotation unevenness occurs in the upper and lower spindles 10a and 11a due to the spline of the drive shaft 18c and the backlash of the gear train 18a. Deviation occurs.
In order to prevent this, when machining the workpiece 16, the plate 11g of the lower spindle 11a is rotated by a locking means (not shown) such as Loctite while the C-axis is rotated in one direction to remove the backlash of the upper and lower gear train 18a. Can be fixed.
[0042]
On the other hand, an outer peripheral processing means 24 for processing the outer peripheral surface of the workpiece 16 is provided at a substantially intermediate portion of the column 1b, and an inner peripheral surface processing means for processing the inner peripheral surface of the work 16 simultaneously with the outer peripheral surface on the bed 1a. 25 is installed.
As shown in FIG. 6, a tool support member 24c is supported in a cylindrical guide member 24a horizontally fixed to the column 1b via a ball spline 24b so as to be movable in the X-axis direction. .
[0043]
A tool 26 for cutting the outer peripheral surface of the workpiece 16 is detachably attached to the end portion of the tool support member 24c on the workpiece 16 side via a tool attachment member 24d, and on the opposite side of the tool support member 24c. A nut member 27a is fixed to the end, and one end side of a screw shaft 27 made of a ball screw is screwed into the nut member 27a.
The other end side of the screw shaft 27 is connected to an X-axis motor 29 made of a servo motor attached to the column 1b via a bracket 28, and the screw shaft 27 is rotated forward and backward by the X-axis motor 29. As a result, the tool 26 can be moved in the contact / separation direction of the workpiece 16.
[0044]
The inner peripheral processing means 25 for processing the inner peripheral surface of the work 16 is composed of a roller type linear guide laid on the bed 1a in the U-axis direction parallel to the X-axis as shown in FIGS. A U-axis slide 25 a supported on the guide rail 31 is provided.
The upper part of the U-axis slide 25a is covered with a roof-shaped cover 25c so that chips are easily discharged, and the U-axis slide 25a is placed between the lower part of the U-axis slide 25a and the upper surface of the bed 1a. A U-axis motor 32 composed of a linear servomotor that drives in the direction is installed.
[0045]
The front end side of the U-axis slide 25a reaches the lower part of the lower spindle 11a, and the lower end of a boring bar 25b provided substantially perpendicular to the front end is fixed.
The upper end side of the boring bar 25b reaches the workpiece 16 through the lower spindle 11a, and a tool 33 for cutting the inner periphery of the workpiece 16 is detachably attached to the upper end portion.
[0046]
In FIG. 8, 34 is a U-axis origin detecting means for detecting the origin position of the U-axis slide 25a, and 35 is a slide position detecting means such as a linear scale for detecting the position of the U-axis slide 25a. The detected signal is input to an NC device (not shown) that performs NC control on the Z-axis motor 4, the C-axis motor 19, the X-axis motor 29, the U-axis motor 32, and the like.
[0047]
Next, the operation of machining the workpiece 16 such as a piston ring by the machining apparatus configured as described above will be described.
Since the work 16 such as a piston ring has different noncircular curved shapes on the outer periphery and the inner periphery, it is necessary to perform NC control on the outer periphery processing means 24 and the inner periphery processing means 25 separately.
[0048]
Since the workpiece 16 is rotated by the C-axis motor 19 and the inner and outer circumferences of the workpiece 16 are simultaneously processed, the X-axis motor 29, the U-axis motor 32, and the Z-axis motor 4 are synchronized with the rotation of the C-axis motor 10. It is necessary to control, and in a normal machining cycle, it takes time to process the movement data, and machining is difficult.
Therefore, in this embodiment, machining is performed by selecting high-speed cycle machining of the NC function or DNC operation.
[0049]
When machining with NC function high-speed cycle machining, register the data converted into the travel per basic processing time and the number of repetitions of that cycle in the NC high-speed machining data area and header section, and use the machining main program. Perform high-speed cycle machining.
In processing, a cylindrical workpiece 16 is formed by laminating a plurality of piston rings with the same phase, and clamped in the vertical direction by a hand carrier jig (not shown), and the processing apparatus main body is kept in that state. 1 and set between the clamp heads 10f and 11f of the upper spindle 10a and the lower spindle 11a.
[0050]
In this state, a high hydraulic pressure is supplied from the hydraulic pressure source 40 to the hydraulic chamber 12b of the hydraulic cylinder 12, the upper spindle 10a is lowered together with the piston 12a, and the clamp head 10f of the upper spindle 10a and the lower spindle 11a are lowered. The clamp head 11f is clamped so that the center line of the workpiece 16 coincides with the centers of the upper and lower spindles 10a and 11a, and the large thrust bearing 14 carries the clamping force at this time.
[0051]
Next, when the phase of the workpiece 16 is indexed in this state, the upper and lower spindles 10a and 11a are synchronously rotated by the C-axis motor 19 via the C-axis driving means 18 to rotate the workpiece 16 and to the outer peripheral machining means 24. The provided tool 26 cuts the outer peripheral surface of the workpiece 16 from, for example, the lower end side of the workpiece 16, and simultaneously cuts the inner peripheral surface of the workpiece 16 from the lower end side by the tool 33 of the inner peripheral processing means 25.
[0052]
Further, since the inner and outer peripheral surfaces of the work 16 are formed by different free curves, the X and Y motors 29 and 32 are separately NC controlled in synchronization with the rotation of the C-axis to control the inner and outer peripheral surfaces of the work 16. In addition to machining, the Z-axis slide 2 is lowered by the Z-axis motor 4 as the machining progresses, and the inner and outer circumferences are cut over the entire length of the workpiece 16, and chips generated during the inner circumference machining of the workpiece 16 Is dropped downward through the lower spindle 11 a, so that the chips do not stagnate in the workpiece 16, and the machining surface is damaged by the chips, or the chips are between the workpiece 16 and the tool 33. There is no concern that the tool will be damaged and the tool will be damaged or the tool life will not be shortened early, and that the processing accuracy will be reduced due to these causes.
[0053]
When the machining of the workpiece 16 is completed as described above, the X-axis slide 2 and the U-axis slide 25a are moved back to their original positions by the U-axis motor 29 and the U-axis motor 32, and the Z-axis slide 2 is moved by the Z-axis motor 4. Then, the hydraulic pressure in the hydraulic chamber 12b of the hydraulic cylinder 12 is discharged, the upper spindle 10a is raised by the action of the return spring 10e, and the workpiece 16 is unclamped.
Thereafter, the workpiece 16 is clamped in the vertical direction so that the phase of each piston ring is not shifted by the hand carrier jig, and the workpiece 16 is unloaded from between the clamp heads 10f, 11f, and a new workpiece 16 is processed. In such a case, the above operation may be repeated.
[0054]
On the other hand, as shown in FIG. 10, when measuring means 45 such as a dial gauge is brought into contact with the support surfaces of the upper and lower workpiece support means 10 and 11 to measure the parallelism of the support surface or to check the machining program, The machining apparatus is operated without clamping the workpiece 16 between the workpiece support means 10 and 11. However, since a large clamping force is not required at this time, the pilot relief valve 42 is operated and set by the pilot relief valve 42. The low pressure is supplied to the hydraulic chamber 12b of the hydraulic cylinder 12, and the clamping force (reaction force of the return spring 10e) at this time is received by the small thrust bearing 14a.
[0055]
In the above-described embodiment, the vertical processing machine that processes the inner and outer peripheral surfaces by setting the workpiece 16 in the vertical direction has been described. However, the horizontal piston that sets the workpiece 16 in the horizontal direction and processes the inner and outer peripheral surfaces. It can also be applied to a ring processing machine.
[Brief description of the drawings]
FIG. 1 is a front view of a piston ring processing machine according to an embodiment of the present invention.
FIG. 2 is a side view of the piston ring processing machine according to the embodiment of the present invention.
FIG. 3 is an enlarged view of a main part of the piston ring processing machine according to the embodiment of the present invention.
FIG. 4 is a cross-sectional view of the C-axis and Z-axis drive means of the piston ring processing machine according to the embodiment of the present invention.
FIG. 5 is a cross-sectional view of the workpiece support means of the piston ring processing machine according to the embodiment of the present invention.
FIG. 6 is a cross-sectional view of the outer periphery processing means of the piston ring processing machine according to the embodiment of the present invention.
FIG. 7 is a plan view of the inner periphery processing means of the piston ring processing machine according to the embodiment of the present invention.
FIG. 8 is a side view of the inner periphery processing means of the piston ring processing machine according to the embodiment of the present invention.
9 is a view as seen from the direction of arrow A in FIG.
FIG. 10 is a hydraulic circuit diagram of the piston ring processing machine according to the embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Processing-machine main body 1a ... Bed 1b ... Column 1c ... Guide rail 2 ... Z-axis slide 3 ... Z-axis drive means 4 ... Z-axis motor 4a ... Rotating shaft 5 ... Screw shaft 6 ... Strip 7 ... Pulley 8 ... Counterweight DESCRIPTION OF SYMBOLS 10 ... Upper work support means 10a ... Upper spindle 10b ... Ring 10c ... Fixed shaft 10d ... Spring seat 10e ... Return spring 10f ... Upper clamp 11 ... Lower work support means 11a ... Lower spindle 11f ... Lower clamp head 11g ... Plate 12 ... Liquid Pressure cylinder 12a ... Piston 12b ... Hydraulic chamber 13 ... Bearing 14 ... Thrust bearing 14a ... Thrust bearing 16 ... Work piece 18 ... C-axis drive means 18a ... Gear train 18b ... Drive gear 18c ... Drive shaft 18d ... Drive gear 18e ... Intermediate gear 19 ... C-axis motor 20 ... Reducer 20a ... Input shaft 20b ... Flywheel 20c ... Output shaft 21 ... Support 22 ... Thrust bearing 24 ... Outer peripheral processing means 24a ... Guide member 24b ... Ball spline 24c ... Tool support member 25 ... Inner peripheral processing means 25a ... U-axis slide 25b ... Boring bar 25c ... Cover 26 ... Tool 27 ... Screw shaft 27a ... Nut member 28 ... Bracket 29 ... X-axis motor 31 ... Guide rail 32 ... U-axis motor 34 ... U-axis origin detection means 35 ... Slide position detection means 40 ... Hydraulic pressure source 41 ... Electromagnetic valve 42 ... Pilot relief valve 43 ... Clamp detection Means 44 ... Clamp detection means 45 ... Measuring means

Claims (7)

In the piston ring processing machine that simultaneously processes the inner and outer peripheral surfaces of the work 16 whose inner and outer peripheral surfaces are formed in a non-circular curve,
Workpiece support means 10, 11 having a pair of spindles 10a, 11a for rotatably supporting a plurality of stacked workpieces 16 from both ends;
A Z-axis slide 2 that accommodates the pair of workpiece support means 10 and 11;
Provided on at least one of said workpiece support means 10 and 11, and the spindle 10a, by pressurizing 11a in the axial direction of the workpiece 16, and clamping means for clamping the workpiece 16 between each spindle 10a, 11a,
Z-axis drive means 3 having an NC-controlled Z-axis motor 4 for moving the Z-axis slide 2 in the Z-axis direction parallel to the axis of the workpiece 16 ;
C-axis drive means 18 having a C-axis motor 19 controlled by NC for driving both the spindles 10a and 11a ,
An NC device for operating the Z-axis slide 2 in the Z-axis direction by the Z-axis driving means 3 and the rotation of the spindles 10a and 11a by the C-axis driving means 18 in synchronization is provided. This is a piston ring processing machine. The piston ring processing machine according to claim 1, wherein the Z-axis slide 2 has a box structure in which a support 2 a is disposed at a corner portion. 3. The Z-axis drive means 3 comprises a linear guide rail 1a that supports a Z-axis slide 2 so as to be movable in the Z-axis direction, and a ball screw shaft 5 that is rotated forward and backward by a Z-axis motor 4. The piston ring processing machine described . 3. A piston ring processing machine according to claim 1, wherein a flywheel 20g is connected to the C-axis motor 19 of the C-axis drive means 18 . The piston ring processing machine according to claim 1 or 2, wherein the clamping means is a hydraulic clamping means for pressurizing the spindle 10a by a hydraulic cylinder 12 provided on at least one of the workpiece support means 10, 11 . 6. The piston ring processing machine according to claim 5, wherein a hydraulic circuit for selectively supplying high pressure and low pressure is connected to a hydraulic cylinder 12 provided on the work support means 10 and 11 . 7. A piston ring according to claim 6, wherein the workpiece support means provided with the hydraulic cylinder is provided with a thrust bearing carrying a clamping force at a high pressure and a thrust bearing a bearing a clamping force at a low pressure. Processing machine.

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