JP2014223690A - Piston ring processing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a piston ring processing device which accurately and efficiently processes a side surface of a piston ring.SOLUTION: A piston ring processing device 100 includes: a piston ring supply/discharge part 10 which supplies and discharges a piston ring; a robot hand 20 which sandwiches and transfers the piston ring; a work shaft 30 which holds the piston ring; and a grinding wheel machine 40 which processes a side surface of the piston ring held by the work shaft 30. The robot hand 20 receives the piston ring held by the work shaft 30, inverts the piston ring 180 degrees to cause the work shaft 30 to hold the piston ring, and thereby enables the grinding wheel machine 40 to process double surfaces of the piston ring when the grinding wheel machine 40 completes the processing of one surface of the piston ring.

Description

  The present invention relates to a piston ring used in an internal combustion engine, a compression engine, and the like, and more particularly to a piston ring processing apparatus that can process a pressure ring having a keystone shape as upper and lower side surfaces with high accuracy.

  Three to four piston rings are attached to the piston of the internal combustion engine. In general, the upper two or three piston rings are called pressure rings and have a function of maintaining the airtightness between the combustion chamber and the crank chamber, and transferring the heat of the piston to the cylinder to dissipate heat. Further, the lower one or two piston rings are called oil control rings and have a function of scraping off excess oil while forming an oil film on the inner wall surface of the cylinder liner.

  In order to prevent the combustion products and carbon residue from accumulating in the piston groove and sticking to the pressure ring attached to the diesel engine with high combustion pressure and long operation period, the keystone is attached to the upper and lower sides of the piston ring. Used with processing. A keystone-shaped piston ring is disclosed in, for example, Patent Document 1.

  Conventionally, the grinding process of the upper and lower side surfaces of the keystone ring has used two grinding machines for each side. Use of two grinding machines complicates the work transfer between the facilities, and the waiting time of the facilities is generated from the start to the completion of continuous processing, resulting in a long processing time. Naturally, if two units are used, initial cost, maintenance cost, and installation space are required, which is not economical. Although not keystone processing, methods for simultaneously grinding the upper and lower side surfaces of parallel piston rings are disclosed in Patent Documents 2 and 3, for example.

JP-A-62-279043 JP 2002-307272 A Japanese Utility Model Publication No. 04-79047

  Conventionally, the use of two grinding machines to ensure the accuracy of keystone processing complicates the work transfer between facilities, resulting in equipment waiting time from the start to the end of continuous processing, and the processing time. Has the disadvantage of becoming longer. In the case of pistonstone keystone processing, if both surfaces are ground simultaneously, the balance between the processing amounts of the two axes of the grinding wheel shaft cannot be controlled, so accuracy is not good.

  An object of this invention is to provide the piston ring processing apparatus which can process the side surface of a piston ring accurately and efficiently.

  A piston ring processing apparatus according to the present invention includes a supply means capable of supplying a piston ring, a clamping means for clamping the piston ring, a holding means for rotatably holding the piston ring during the processing of the piston ring, and the holding Processing means for processing a side surface of the piston ring held by the means, and moving means for moving the clamping means between the supply means and the holding means, the clamping means being a piston ring by the processing means. When the processing of the one surface is finished, the piston ring held by the holding means is received, the piston ring is inverted, and the holding means holds the piston ring. Process the surface.

  Preferably, the piston ring processing apparatus further includes a turning means for turning an axis center of the holding means or the processing means in accordance with a processing shape formed on a side surface of the piston ring. Preferably, the clamping means includes a pair of arm members that clamp the outer peripheral surface of the piston ring, and a rotating shaft connected to the arm members. Preferably, the turning means turns according to an angle of a keystone formed on a side surface of the piston ring. Preferably, the holding means includes at least two holding means, and while the one piston ring held by one holding means is being processed by the processing means, the other holding means holds the other piston ring. To do. Preferably, the clamping means includes at least two clamping means, and the moving means moves the at least two clamping means independently of each other. Preferably, the processing means includes at least two processing means, one processing means processes one surface of the piston ring, and the other processing means processes two surfaces of the piston ring.

  According to the present invention, the side surface of the piston ring can be processed accurately and efficiently. Furthermore, according to the present invention, space saving and size reduction of the piston ring processing apparatus can be achieved.

It is a schematic plan view which shows the piston ring processing apparatus which concerns on the Example of this invention. FIG. 2 shows a schematic configuration of the robot hand shown in FIG. 1, FIG. 2 (A) is a schematic plan view, and FIG. 2 (B) is a diagram showing a state in which a piston ring is sandwiched. FIG. 3A shows a state in which the turning angle of the workpiece axis is zero, and FIG. 3B shows a state in which the workpiece axis has been turned according to the keystone angle. It is a figure explaining the workpiece axis jig provided in the workpiece axis which concerns on the Example of this invention, FIG. 4 (A) is a schematic sectional drawing which shows a mode when a piston ring is inserted in a workpiece axis jig. 4B is a schematic cross-sectional view showing a state where the piston ring is held on the work shaft jig, and FIG. 4C is a schematic cross-sectional view showing a state where the piston ring is pushed out from the work shaft jig. It is. It is the top view and front view of the pusher for pushing out an arm from the work jig concerning the example of the present invention. It is a schematic sectional drawing which shows a mode that the side surface of a piston ring is processed with the grindstone apparatus. It is a block diagram which shows the electrical structure of the piston ring processing apparatus which concerns on the Example of this invention. It is a figure which shows the example by which a grindstone apparatus is rotated in the piston ring processing apparatus which concerns on the Example of this invention. It is a figure which shows the example in which several robot hands are provided in the piston ring processing apparatus which concerns on the Example of this invention. It is a schematic plan view which shows the piston ring processing apparatus which concerns on the 2nd Example of this invention. It is a figure explaining operation | movement of the piston ring processing apparatus which concerns on 2nd Example of this invention. It is a schematic plan view which shows the piston ring processing apparatus which concerns on the other preferable aspect of the 2nd Example of this invention. It is a schematic plan view which shows the principal part of the piston ring processing apparatus which concerns on the 3rd Example of this invention. It is a figure which shows an example of the process sequence of the piston ring which concerns on 3rd Example of this invention.

  Next, a preferred embodiment of the piston ring processing apparatus of the present invention will be described. In a preferred embodiment, the piston ring processing apparatus is used to form a keystone on the side surface of the piston ring. A half keystone ring is known in which one side of the piston ring has an angle and the other side is 0 degrees, or a keystone ring in which both sides have an angle. Such a keystone ring suppresses a change in side clearance caused by the piston ring moving in the radial direction within the ring groove of the piston. Further, the processing of the side surface of the piston ring is not limited to the keystone, and there are those in which a step is formed on the side surface and those in which an undercut is formed, and the present invention can also be applied to such processing. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, it should be noted that the drawings are emphasized for easy understanding of the invention and are not necessarily on the same scale as actual devices and products.

  FIG. 1 is a schematic plan view showing the main part of the entire piston ring processing apparatus according to an embodiment of the present invention. As shown in the figure, a piston ring processing apparatus 100 according to this embodiment includes a piston ring supply / discharge portion 10 that enables supply and discharge of the piston ring, and a robot hand 20 that enables delivery of the piston ring to each portion. And a work shaft 30 that holds the piston ring to be processed, and a grindstone device 40 that processes the side surface of the piston ring held by the work shaft 30. Each of these units can be mounted on a single table or a plurality of tables.

  The piston ring supply / discharge unit 10 accommodates a plurality of piston rings, supplies a piston ring whose side surface is not processed to the robot hand 20, and receives the piston ring whose side surface is processed from the robot hand 20. Although a specific configuration of the piston ring supply / discharge portion 10 is not disclosed herein, the piston ring supply / discharge portion 10 can be configured using a known means.

  The robot hand 20 has a function of detachably holding the piston ring and transporting the piston ring. The robot hand 20 can move along a path indicated by a broken line X as shown in FIG. 1, that is, a position P <b> 1 for transferring the piston ring to and from the piston ring supply / exhaust portion 10, a standby position P <b> 2, a workpiece axis. It is possible to move the position P3 that allows the piston ring to be transferred to and from the position 30.

  The robot hand 20 is not particularly limited as long as it can sandwich and convey the piston ring, but one configuration example is shown in FIG. FIG. 2 (A) shows a plan view of the robot hand when the piston ring is not clamped, and FIG. 2 (B) shows a plan view of the robot hand with the piston ring clamped. The robot hand 20 includes a pair of arm members 22 and a rotation shaft 24 connected to the pair of arm members 22. At least one of the pair of arm members 22 can move in a direction Q in which the distance between the arm members is narrowed by using driving of a motor or the like (not shown), or vice versa. The pair of arm members 22 can clamp the outer periphery of the piston ring PR with a constant contact pressure by adjusting the distance between them.

  The rotating shaft 24 can be rotated in a direction R such that the front and back of the arm member 22 are reversed using driving of a motor or the like (not shown). In a preferred example, when the piston ring that has been processed on one side surface is received from the work shaft 30 by the robot hand 20, the rotation shaft 24 rotates 180 degrees to reverse the side surface of the piston ring. 2 shows an example in which the arm member 22 is movable in the Q direction. However, the arm member 20 is divided into two members, and the divided arm members are orthogonal to the Q direction. It may be configured to be movable.

  The work shaft 30 is a cylindrical member, can be rotated by driving a motor (not shown), and can be swung in a range of a predetermined angle θ. When the workpiece shaft 30 delivers the piston ring via the robot hand 20, as shown in FIG. 3A, the turning angle θ = 0, and the axis center C 1 of the workpiece shaft 30 is the axis of the robot hand 20. It almost coincides with the center C2 (the approximate center of the piston ring). On the other hand, when the side surface of the piston ring is keystone processed, the rotation axis C1 of the work shaft 30 has a turning angle θk corresponding to the keystone angle, as shown in FIG.

  When the robot hand 20 exists at the position P <b> 3, the piston ring held by the robot hand 20 is transferred to the work shaft 30, or the piston ring held by the work shaft 30 is transferred to the robot hand 20. In FIG. 4, the structural example of the workpiece | work axis | shaft 30 of a present Example is shown. An annular or ring-shaped workpiece shaft jig 32 is attached to the end of the workpiece shaft 30. The inner diameter of the space 34 formed in the center of the workpiece shaft jig 32 is preferably smaller than the outer diameter of the piston ring PR (approximate outer diameter when the joint is opened), and is held by the robot hand 20. It is somewhat larger than the outer diameter of the piston ring PR. As a result, the transfer of the piston ring PR from the robot hand 20 to the workpiece axis jig 32 is facilitated, and the piston ring PR is held by the workpiece axis jig 32 while being elastically pressed by the inner wall of the space 34. .

  A first pusher 50 is disposed in the vicinity of the end of the work shaft 30. As shown in FIG. 5, the first pusher 50 includes a ring 52 having an outer diameter substantially equal to or smaller than the piston ring PR, and a plurality of claw portions 54 extending radially from the center. The first pusher section 50 is movable in the axial direction C1 of the work shaft 30 by driving a motor or the like (not shown). As shown in FIG. 4A, when the robot hand 20 is positioned at a position P3 facing the workpiece axis jig 32, the first pusher 50 is moved toward the workpiece axis 30. The piston ring PR sandwiched between 20 is transferred into the space 34 of the workpiece shaft jig 32. Finally, as shown in FIG. 4B, one side surface of the piston ring PR is brought into contact with the end portion of the work shaft 30. At this time, the height of the piston ring PR is larger than the height of the workpiece shaft jig 32, and the opposite side surface of the piston ring, that is, the side surface to be processed is exposed to the outside in the workpiece shaft jig 32.

  In addition, a second pusher 60 that is movable from the end portion thereof toward the outside is accommodated in the work shaft 30. The second pusher 60 includes, for example, a ring 62 having an outer diameter substantially equal to or smaller than the piston ring PR and a plurality of claws extending radially from the center, as shown in FIG. Part 64. The second pusher portion 60 is movable in the axial direction C1 of the work shaft 30 by driving a motor or the like (not shown). As shown in FIG. 4C, when the robot hand 20 is positioned at the position P3 facing the workpiece axis jig 32, the second pusher 60 moves toward the robot hand 20, thereby the workpiece axis. The piston ring PR held by the jig 32 is moved into the robot hand 20. At this time, the distance between the pair of arm members 22 of the robot hand 20 is somewhat larger than the outer diameter of the work shaft jig 34, and the transfer of the piston ring PR is performed smoothly.

  Although the grindstone device 40 is configured by a known configuration, for example, as shown in FIG. 1, a motor 42, a rotating belt 44 hung on the rotating shaft of the motor 42, and a grindstone 46 rotated by the rotating belt 44. With. The grindstone device 40 is configured to be movable in a direction Y1 that approaches or separates from the workpiece shaft 30 and a direction Y2 that is orthogonal to the workpiece shaft 30 by driving a motor or the like (not shown). When machining the side surface of the piston ring PR held rotatably on the work shaft 30, the grindstone device 40 is moved in the directions Y1 and Y2 and positioned with respect to the turned work shaft 30. Then, the rotating grindstone 46 contacts the side surface of the rotating piston ring PR and polishes the side surface. In a preferred embodiment, traverse polishing of the side surface of the piston ring is performed by moving the grindstone 46 in the Y2 direction. FIG. 6 is a diagram illustrating a state in which the side surface of the piston ring PR is processed by the grindstone device 40.

  Next, an example of the electrical configuration of the piston ring processing apparatus of this embodiment will be described. FIG. 7 is a block diagram showing an electrical configuration of the piston ring processing apparatus 100. As shown in the figure, the piston ring processing apparatus 100 includes a work shaft drive unit 200 that rotates and turns the work shaft 30, a robot hand drive unit 210 that performs clamping and movement by the robot hand 20, and first and second parts. A pusher drive unit 220 for moving the pushers 50, 60, a grindstone device drive unit 230 for moving the grindstone and moving the grindstone device, and a piston ring supply / discharge drive unit that enables the piston ring to be supplied to or discharged from the robot hand 20. 232, the position detection part 240, the display part 250, the program memory 260, the data memory 270, and the control part 280 which controls each part.

  The work shaft drive unit 200, the robot hand drive unit 210, the pusher drive unit 220, and the grindstone device drive unit 230 use known power transmission means such as a link mechanism, a gear mechanism, and a belt mechanism that use power such as a motor. Under the control of the control unit 280, the work shaft 30, the robot hand 20, and the first and second pushers 50 and 60 are driven.

  The position detection unit 240 includes a position detection sensor that detects the positions of the workpiece shaft 30, the robot hand 20, the first and second pushers 50 and 60, and the grindstone device 40, and provides the detection result to the control unit 280. The control unit 280 controls driving of each unit based on these position detection results. Although not shown here, in addition to the position detection unit 240, various sensors necessary for controlling each unit, such as an angle sensor and a pressure sensor, may be provided.

  The display unit 250 displays an alarm such as a warning, and displays other information related to the machining state. The program memory 260 stores a program for controlling an operation sequence for machining the piston ring. The data memory 270 stores data necessary for processing the piston ring. The control unit 280 controls each unit by executing a program stored in the program memory 260.

  Next, the operation of the piston ring processing apparatus according to this embodiment will be described. First, the robot hand 20 at the standby position P2 is moved to the position P1 of the piston ring supply / discharge section 10, and the robot hand 20 receives the piston ring to be processed from the piston ring supply / discharge section 10 and holds it. In addition, the delivery of a piston ring here can utilize the pusher as demonstrated in the workpiece | work axis | shaft 30. FIG.

  Next, the robot hand 20 holding the piston ring is moved to a position P <b> 3 that faces the work shaft 30. At this time, the workpiece shaft 30 is in a state where it is reset to the turning angle θ = 0 as shown in FIG. The piston ring clamped by the robot hand 20 is moved toward the workpiece axis jig 32 by the first pusher 50 as shown in FIG. 4A, and the workpiece axis is cured as shown in FIG. It is held in the tool 32. When the piston ring is held on the work shaft 30, the robot hand 20 returns to the standby position P2, and the work shaft 30 is turned as shown in FIG. The turning angle θk at this time corresponds to the angle of the keystone formed on the side surface of the piston ring.

  When the work shaft 30 is rotated, the grindstone 46 of the grindstone device 40 is then rotated and moved from the standby position toward the work shaft 30 in the Y1 direction and the Y2 direction. The amount of movement of the grindstone device 40 in the Y1 and Y2 directions is stored in advance in the data memory 270 and the like, and the grindstone device driving unit 230 controls the amount of movement while referring to the detected position information from the position detecting unit 240. . When polishing by the grindstone device is completed, the grindstone device 40 returns to the standby position, and the work shaft 30 is reset to the position of the turning angle θ = 0.

  Next, the robot hand 20 is moved from the standby position P2 to the position P3, and the second pusher 60 pushes the piston ring into the robot hand 20 as shown in FIG. The piston ring is clamped as shown in (B). Next, the robot hand 20 reverses the rotating shaft 24 by 180 degrees. As a result, the processed side surface of the piston ring faces the workpiece shaft 30 side, and the unprocessed side surface is exposed to the grindstone device 40 side. Then, the piston ring clamped by the robot hand 20 is again held in the workpiece axis jig 32, and after that, after the robot hand 20 has moved to the standby position P2, the workpiece axis 30 is turned and rotated, and the grindstone device 40 is moved. Moving in the Y1 and Y2 directions, the keystone processing of the other side of the piston ring is performed.

  When the processing of both surfaces of the piston ring is completed, the piston ring is clamped by the robot hand 20 by the above-described method, and the robot hand 20 is moved to the position P1, where the processed piston ring is moved to the piston ring supply / discharge unit 10. Is discharged. When the discharging is completed, the robot hand 20 receives the piston ring to be processed next, and the key ring processing of the piston ring is performed by the same process as described above. As described above, according to the present embodiment, the piston ring supply / discharge unit 10, the robot hand 20, the work shaft 30, and the grindstone device 40 are mounted on the table, thereby providing a relatively space-saving piston ring processing apparatus. be able to. Further, by reversing the direction of the side surface of the piston ring by the robot hand 20, it becomes easy to process both side surfaces of the piston ring in one work axis. Furthermore, the keystone angle can be freely selected by making the workpiece shaft 30 pivotable to an arbitrary angle.

  In the above embodiment, the keystone processing is performed by turning the workpiece axis 30. However, the turning angle of the workpiece axis is merely an example, and the angle when the workpiece axis is reset is limited to zero degrees. Is not to be done. Further, the work shaft 30 does not necessarily need to be turned. For example, as shown in FIG. 8, you may make it rotate the rotating shaft C3 of the grindstone apparatus 40. As shown in FIG. Of course, both the work shaft 30 and the grindstone device 40 may be turnable.

  In the above embodiment, while the piston ring held on the work shaft 30 is being processed, the robot hand 20 must be in an empty state to receive the piston ring from the work shaft 30 at the standby position P2. I must. In other words, the next process cannot be performed until the processing of one side surface of the piston ring is completed. Therefore, a plurality of sets of robot hands can be prepared to improve the processing efficiency of the piston ring.

  FIG. 9 shows an example using two sets of robot hands 20-1 and 20-2, and the respective movement paths are indicated by broken lines X1 and X2. The robot hands 20-1 and 20-2 are independently driven and controlled by the robot hand driving unit 210. For example, while processing one surface of the piston ring A, the robot hand 20-2 receives the piston ring B to be processed next by the piston ring supply / discharge unit 10. When the processing of one surface of the piston ring A is completed, the piston ring A is received by the robot hand 20-1, and the piston ring B held by the robot hand 20-2 is held by the work shaft 30. While the piston ring B is being processed, the robot hand 20-1 reverses the piston ring A. When the machining of one surface of the piston ring B is completed, the piston ring B is received by the robot hand 20-2, and the piston ring A is moved to the work axis by the robot hand 20-1. While processing the two surfaces of the piston ring A, the robot hand 20-2 is inverted 180 degrees. When the machining of the two surfaces of the piston ring A is completed, the piston ring A is received by the robot hand 20-1, and the piston ring B is moved to the work shaft 30 by the robot hand 20-2. While the two surfaces of the piston ring B are being processed, the robot hand 20-1 is moved to the position P1 while sandwiching the piston ring A, and the piston ring A is discharged to the piston ring supply / discharge portion 10 and then processed. The piston ring C to be received is received and moved to the standby position P2. By providing a larger number of robot hands, such multiple processing enables the piston ring to be transported and processed more efficiently, thereby shortening the processing time.

  Next, a second embodiment of the present invention will be described. In the first embodiment, the piston ring processing apparatus includes one workpiece shaft 30 and one grindstone device 40, but the piston ring processing apparatus according to the second embodiment includes two workpiece axes. And one grindstone device. FIG. 10 is a diagram showing a schematic configuration of a piston ring processing apparatus 100A according to the second embodiment. The same reference numerals are assigned to the same configurations as those in FIG. 1, and the description thereof is omitted.

  In the second embodiment, as described above, the two work shafts 30-1 and 30-2 are provided, and the work shafts 30-1 and 30-2 are independently driven and controlled by the work shaft driving unit 200. The Further, the workpiece axes 30-1 and 30-2 according to the second embodiment are different from the workpiece axis 30 according to the first embodiment in that the workpiece axes 30-1 and 30-2 can move in the axial directions Z1 and Z2. It is a point. In the example shown in FIG. 10, the axial directions of the two workpiece shafts 30-1 and 30-2 are parallel to each other, and the two workpiece shafts 30-1 and 30-2 are between the rotation axis C <b> 3 of the grindstone device 40. Is provided with a turning mechanism of the axial centers Ca and Cb so that an angle corresponding to the keystone angle is set. Further, the axial direction of the robot hand 20 is also inclined at the same angle of the work shafts 30-1 and 30-2, thereby enabling the delivery of the piston ring by the first and second pushers 50 and 60 and the like. Further, the grindstone device 40 is configured to be movable in the Y1 direction and the Y2 direction orthogonal to the Y1 direction in order to process the piston rings held by the two workpiece shafts 30-1 and 30-2.

  Next, the operation of the piston ring machining apparatus according to the second embodiment will be described. 11A shows an example in which the piston ring A is processed, and FIG. 11B shows an example in which the piston ring B is processed. As shown in FIG. 11A, while the piston ring A held on the workpiece shaft 30-1 is being processed by the grindstone device 40, the piston ring B is held on the workpiece shaft 30-2. Next, when the processing of the pistol ring A is completed, as shown in FIG. 11B, the work shaft 30-1 moves to the standby position in the Z1 direction, and the grindstone device 40 is held by the work shaft 30-2. The piston ring B is processed. During the processing of the piston ring B, the piston ring A is received by the robot hand from the work shaft 30-1, where it is inverted 180 degrees and then held on the work shaft 30-1. When the processing of the piston ring B is completed, the grindstone device 40 processes the other surface of the piston ring A held by the work shaft 30-1 as shown in FIG. 11A again. Meanwhile, the robot hand 20 reverses the piston ring B and moves it to the work shaft 30-2.

  In a more preferred embodiment, as shown in FIG. 11A, a second robot hand 20-2 is provided that sandwiches and conveys the piston ring between the work shaft 30-1 and the work shaft 30-2. The second robot hand 20-2 can move between the work shafts 30-1 and 30-2 as indicated by a broken line X2 in the figure, and receives the piston ring that has been processed by one of the work shafts. It has a function of reversing the direction by 180 degrees and transferring it to the other workpiece axis. It is sufficient that such second robot hand 20-2 can move at least between the workpiece axes 30-1 and 30-2. However, in the example shown in FIG. 11A, the second robot hand 20-2 is configured to be movable between a standby position P4 and a position P3 facing the workpiece axes 30-1 and 30-2. .

  If an example of a processing sequence is shown, the piston ring A will be transferred to the workpiece | work axis | shaft 30-1 by the 1st robot hand 20, and one surface of piston ring A will be processed there. The piston ring A for which one surface has been processed is received by the second robot hand 20-2, and after the second robot hand 20-2 reverses the direction of the piston ring A by 180 degrees, the piston ring A is The workpiece is transferred onto the work shaft 30-2, where two surfaces are machined. During this time, the first robot hand 20 receives the piston ring B to be processed next from the piston ring supply / exhaust portion 10, transfers the piston ring B to the work shaft 30-1, and one surface of the piston ring B is processed. The When the machining of the two surfaces of the piston ring A is completed on the work shaft 30-2, the first robot hand 20 receives the piston ring A from the work shaft 30-2 and discharges it to the piston ring supply / discharge unit 10. The first robot hand 20 receives the piston ring C to be processed next, and conveys the piston ring C to the work shaft 30-1. On the other hand, the piston ring B that has been processed on one surface by the workpiece shaft 30-1 is transferred to the workpiece shaft 30-2 by the second robot hand 20-2, where two surfaces are processed.

  With such a configuration, the workpiece shaft 30-1 is used for machining one surface of the piston ring, and the workpiece shaft 30-2 is used for machining two surfaces of the piston ring, and the piston ring is continuously formed. Can be processed.

  According to the second embodiment, while one piston ring is being processed by one work shaft, preparation for processing the other piston ring can be performed on the other work shaft. Can be shortened.

  Next, a third embodiment of the present invention will be described. The second embodiment includes two sets of work shafts and one grindstone device, while the third embodiment includes two sets of work shafts and two sets of grindstone devices. The pair of work shafts and the grindstone device are driven and controlled by the work shaft drive unit 200 and the grindstone device drive unit 230. In other words, this is equivalent to a configuration including a plurality of workpiece axes and a grindstone device of the first embodiment. FIG. 12 is a diagram showing a main part of a piston ring processing apparatus 100C according to the third embodiment. As shown in the figure, one grindstone device 40-1 is assigned to one work shaft 30-1, and the other grindstone device 40-2 is assigned to the other work shaft 30-2. The operation is performed in the same manner as in the first embodiment. Also, as shown in FIG. 9, two sets of robot arms 20 are prepared, and the robot arms 20-1 and 20-2 are connected to the work shaft 30-1, the shaft 30-2, and the piston ring supply / discharge portion 10. A plurality of piston ring conveyance routes are formed therebetween. In a more preferable aspect, as shown in FIG. 12, a robot hand 20-3 is provided that sandwiches and conveys a piston ring between a workpiece shaft 30-1 and a workpiece shaft 30-2. Movement as indicated by X3 is possible. With such a configuration, the workpiece shaft 30-1 is used for machining one surface of the piston ring, and the workpiece shaft 30-2 is used for machining two surfaces of the piston ring, and the piston ring is continuously formed. Can be processed.

  FIG. 13 is a diagram showing an example of a piston ring pipeline processing sequence when the piston ring machining apparatus according to the third embodiment is used. First, at time T1, the piston ring PR1 taken out from the piston ring supply / discharge unit 10 is set in the robot hand 20-1.

  At time T2, the piston ring PR1 is set on the work shaft 30-1 by the robot hand 20-1, and one surface of the piston ring PR1 is processed. In the meantime, the next piston ring PR2 is set in the robot hand 20-2.

  At time T3, the piston ring PR1 is set on the work shaft 30-2 via the robot hand 20-3, and two surfaces of the piston ring PR1 are processed. The piston ring PR2 is set on the work shaft 30-1 by the robot hand 20-2, and one surface of the piston ring PR2 is processed. Further, the piston ring PR3 is set in the piston ring supply / discharge portion 10 in the robot hand 20-1.

  At time T4, the piston ring PR3 is set on the work shaft 30-1 by the robot hand 20-1, and one surface of the piston ring PR3 is processed. The piston ring PR2 is transported from the work shaft 30-1 to the work shaft 30-2 by the robot hand 20-3, and two surfaces of the piston ring PR2 are processed. The robot hand 20-2 sets the piston ring PR4 after discharging the piston ring PR1 processed by the work shaft 30-2 to the piston ring supply / discharge unit 10.

  At time T5, the piston ring PR4 is set on the work shaft 30-1 by the robot hand 20-2, and one surface of the piston ring PR4 is processed. The piston ring PR3 is transported from the work shaft 30-1 to the work shaft 30-2 by the robot hand 20-3, and two surfaces of the piston ring PR3 are processed. The robot hand 20-1 sets the piston ring PR5 after discharging the piston ring PR2 processed by the work shaft 30-2 to the piston ring supply / discharge portion 10.

  As described above, according to the third embodiment, the front and back surfaces of the piston ring can be processed continuously and efficiently, and the time required for the keystone processing of the piston ring can be shortened.

  The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to such embodiments, and various modifications and changes can be made within the scope of the gist of the present invention described in the claims. Is possible.

10: Piston ring supply / discharge unit 20: Robot hand 22: Arm member 24: Rotating shaft 30: Work shaft 32: Work shaft jig 34: Jig space 40: Grinding wheel device 42: Motor 44: Drive belt 46: Grinding wheel 50: First pusher 60: second pusher 100, 100A: piston ring processing device PR: piston ring

Claims (7)

A piston ring processing device for processing a piston ring,
Supply means capable of supplying a piston ring;
Clamping means for clamping the piston ring;
Holding means for rotatably holding the piston ring during processing of the piston ring;
Processing means for processing the side surface of the piston ring held by the holding means;
Moving means for moving the clamping means between the supply means and the holding means;
The clamping means receives the piston ring held by the holding means when the machining means finishes processing of one surface of the piston ring, reverses the piston ring, causes the holding means to hold the piston ring, and The processing means is a piston ring processing device that processes two surfaces of the inverted piston ring. The piston ring processing apparatus according to claim 1, further comprising a turning means for turning the holding means or the axial center of the processing means in accordance with a processing shape formed on a side surface of the piston ring. The piston ring processing apparatus according to claim 1, wherein the clamping means includes a pair of arm members that clamp an outer peripheral surface of the piston ring, and a rotating shaft connected to the arm members. The piston ring processing apparatus according to claim 1, wherein the turning means is turned according to an angle of a keystone formed on a side surface of the piston ring. The holding means includes at least two holding means. While one piston ring held by one holding means is being processed by the processing means, the other holding means holds the other piston ring. The piston ring processing apparatus according to claim 1. 6. The piston ring processing apparatus according to claim 5, wherein the clamping means includes at least two clamping means, and the moving means moves the at least two clamping means independently of each other. The processing means includes at least two processing means, wherein one processing means processes one surface of the piston ring, and the other processing means processes two surfaces of the piston ring. Piston ring processing device as described in one.

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