Processing equipment

Abstract

To provide a processing device which can suppress variation in processing resistance depending on a processing tool when processing is performed using a plurality of processing tools.SOLUTION: A processing device according to the present invention includes a first processing part and a second processing part, wherein the first processing part includes a first slider 61 connected to a first processing tool 601, a plurality of first leaf springs 671, at least one first magnet 621, and at least one first coil. The first processing tool 601 connected to the first slider 61 is moved to the outer peripheral surface of a workpiece by an interaction between the first coil and the first magnet 621. The second processing part includes a second slider 71 connected to the second processing tool 701, a plurality of second leaf springs 771, at least one second magnet, and at least one second coil. The second processing tool 701 is moved by an interaction between the second coil and the second magnet.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a processing device. [Background technology]

[0002] Various machining devices have been proposed for machining a workpiece into a non-circular shape. Patent Document 1 discloses a machining unit that supports multiple blades arranged horizontally, and machining is performed by bringing one of the blades close to the workpiece and then moving the entire machining unit back and forth. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-23981 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0004] However, because the above-mentioned machining unit has multiple blades arranged horizontally, there is a problem in that the cutting resistance during machining differs between the blades arranged in the center and the blades arranged at the ends. Therefore, there is a risk that the machining accuracy will differ depending on the blade used. This is not limited to when machining a non-circular workpiece, but is a problem that can occur in all devices that drive multiple blades (machining tools) with a single drive mechanism.

[0005] The present invention has been made to solve the above problem, and aims to provide a processing device that can suppress variations in processing resistance due to processing tools when processing is performed using multiple processing tools. [Means for solving the problem]

[0006] The processing device according to the present invention comprises a workpiece support unit that supports a cylindrical workpiece rotatably around a first direction, which is the axial direction of the workpiece, and a processing unit that is configured to be movable in the first direction and processes the workpiece, the processing unit comprising a first processing section having a first processing tool, and a second processing section that is disposed at a position different from the first processing section and has a second processing tool, the first processing section comprising a first slider connected to the first processing tool, a plurality of first leaf springs that support the first slider, at least one first magnet fixed to the first slider, and at least one first leaf spring that is adjacent to the first magnet. and a coil, and is configured such that the first processing tool connected to the first slider is moved in a second direction toward and away from the outer peripheral surface of the workpiece through interaction between the first coil and the first magnet, and the second processing unit is configured such that the second processing tool connected to the first slider is moved in a second direction toward and away from the outer peripheral surface of the workpiece through interaction between the first coil and the first magnet, and the second processing unit is configured such that the second processing tool connected to the second slider is moved in the second direction toward and away from the outer peripheral surface of the workpiece through interaction between the second coil and the second magnet.

[0007] In the above processing device, a third direction perpendicular to the first direction and the second direction is defined, the first processing part is arranged below the second processing part, the first magnet and the first coil are arranged on one side of the third direction, sandwiching the first processing tool, and at least one first leaf spring is arranged on the other side of the third direction, and the second processing part is configured so that the second magnet and the second coil are arranged on the other side of the third direction, sandwiching the second processing tool, and at least one second leaf spring is arranged on the one side of the third direction.

[0008] In the above processing device, a third direction perpendicular to the first direction and the second direction is defined, and in the first processing section, at least one of the first springs is arranged on one side of the third direction, sandwiching the first processing tool, and at least one of the first leaf springs is arranged on the other side of the third direction; and in the second processing section, at least one of the second springs is arranged on one side of the third direction, sandwiching the second processing tool, and at least one of the second leaf springs is arranged on the other side of the third direction.

[0009] In the processing device, the first processing tool can be configured to process a material that is harder than a material of the second processing tool.

[0010] In the processing device, the second processing tool can be disposed closer to the workpiece than the first processing tool in the processing unit. [Effects of the Invention]

[0011] According to the processing device of the present invention, when processing is performed using a plurality of processing tools, it is possible to suppress variations in processing resistance due to the processing tools. [Brief explanation of the drawings]

[0012] [Figure 1] A front view and a partial cross-sectional view of a piston, which is a workpiece. [Figure 2] FIG. 1 is a plan view showing the outer diameter of a workpiece before and after machining; [Figure 3] 1 is a perspective view showing an embodiment of a processing device according to the present invention. [Figure 4] FIG. 2 is a perspective view of the processing unit with the front cover removed. [Figure 5] FIG. [Figure 6] FIG. 5 is a cross-sectional view taken along line AA in FIG. 4. [Figure 7] FIG. 2 is an exploded perspective view of the processing unit with the first processing part omitted. [Figure 8]FIG. 3 is a partial cross-sectional view of the front part of the processing unit. [Figure 9] 10A to 10C are cross-sectional views showing a processing method. [Figure 10] 10A to 10C are cross-sectional views showing a processing method. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, an embodiment in which the processing device according to the present invention is applied to a processing device for processing the outer diameter (outer peripheral surface) of an engine piston will be described with reference to the drawings. FIG. 1 is a front view of this processing device. The following description will be given according to the directions shown in FIG. 1. However, this direction is one aspect of the present invention, and other arrangements are also possible, so the present invention is not limited to these directions.

[0014] <1. Overview of the work> FIG. 1 is a front view and a partial cross-sectional view of a piston as an example of a workpiece W. The piston W is formed in a cylindrical shape, and an internal space that is open downward is formed inside. Three grooves W1 to W3 are formed at a predetermined interval on the outer circumferential surface of the piston W, and an annular member R is fitted into the uppermost groove W1. The annular member R is made of a hard material such as Ni-resist, and the other parts are made of a softer material than the annular member R, such as an aluminum alloy.

[0015] FIG. 2 is a plan view showing the outer shape of the workpiece before and after machining (however, the shape has been exaggerated for ease of explanation). This piston W is machined as shown in FIG. 2. That is, the amount of cutting on the outer peripheral surface of the piston W, which has a circular cross section, is controlled to form a non-circular outer peripheral surface. In this case, in the machining device according to this embodiment, the outer peripheral surface of the annular member R is cut with a second machining tool (described later), and the remaining outer peripheral surfaces are machined with a first machining tool.

[0016] <2. Overview of the processing equipment> Fig. 3 is a perspective view of the processing device. As shown in Fig. 3, the processing device according to this embodiment includes a rectangular parallelepiped base 1, a workpiece support unit 2 provided on a side of the base 1, a drive unit 3 provided on the same side of the base 1, and a processing unit 4 that can be moved by the drive unit 3.

[0017] <3. Work support unit> 3, the workpiece support unit 2 includes a support part 21 fixed to the side surface of the base 1, and a spindle 22 that can rotate around an axis extending in the vertical direction on the support part 21. The spindle 22 has a cylindrical main body part 221 that extends in the vertical direction, and a mounting part 222 for the workpiece W that is fixed to the upper end of the main body part 221. The main body part 221 can rotate around the axis by a motor (not shown) housed inside the support part 21. The mounting part 222 is formed into a trapezoidal cross section such that the outer diameter increases downward, and a known chuck (not shown) attached to the upper end of the mounting part 222 is fixed to the inner wall surface of the internal space of the workpiece W from below.

[0018] The drive unit 3 includes a first drive unit 31 that moves the machining unit 4 in the up-down direction and a second drive unit 32 that moves the machining unit 4 back and forth. The first drive unit 31 includes a pair of rails 311 that are attached to the side surfaces of the base 1 and extend in the up-down direction, a ball screw 312 that is disposed between the rails 311 and extends in the up-down direction, and a first moving member 313 that is movable along the pair of rails 311. A nut (not shown) is threadedly engaged with the ball screw 312, and the nut is fixed to the first moving member 313. The ball screw 312 is configured to rotate around its axis by a motor 314. As a result, when the motor 314 is driven, the ball screw 312 rotates, and the nut and first moving member 313 move up and down accordingly.

[0019] Next, the second drive unit 32 will be described. The second drive unit 32 is attached to the right surface of the first moving member 313 and includes a pair of rails 321 extending in the front-rear direction, a ball screw 322 disposed between the rails 321 and extending in the front-rear direction, and a second moving member 323 movable along the pair of rails 321. A nut (not shown) is threadedly engaged with the ball screw 322, and the nut is fixed to the second moving member 323. The ball screw 322 is configured to rotate about its axis by a motor 324. As a result, when the motor 324 is driven, the ball screw 322 rotates, and the nut and the second moving member 323 move in the front-rear direction accordingly. The above-mentioned machining unit 4 is fixed to the second moving member 323, and as the second moving member 323 moves, it moves closer to or away from the workpiece W attached to the spindle 22.

[0020] <4. Processing unit> Next, the processing unit 4 will be described with reference to Figures 4 to 7. Figure 4 is a perspective view of the processing unit with the front cover removed, Figure 5 is an exploded perspective view of the processing unit, and Figure 6 is a cross-sectional view taken along line AA in Figure 4. Figure 7 has also been added to make the structure of the processing unit easier to understand. Figure 7 is an exploded perspective view of the processing unit with the first processing section omitted.

[0021] As shown in FIG. 4, the machining unit 4 includes a housing 5 and a first machining unit 6 and a second machining unit 7 housed in the housing 5. As shown in FIG. 2, the housing 5 is formed in a rectangular parallelepiped shape having a front wall 51, a first side wall 52, a second side wall 53, a top wall 54, a bottom wall 55, and a rear wall 56, and the first machining unit 6 and the second machining unit 7 are housed in the internal space enclosed by these. The two machining units 6, 7 are aligned vertically, with the second machining unit 7 located on the upper side. Furthermore, as shown in FIG. 1, the housing 5 has a cover member 57 that covers the front wall 51.

[0022] <4-1. 1st processing section> Next, the first processing unit 6 will be described. As shown in Fig. 5, the first processing unit 6 has a first processing tool 601 that cuts the outer peripheral surface of the workpiece W, and this first processing tool 601 moves a small distance in the front-to-rear direction (first direction). In other words, it moves close to and away from the workpiece W to process the workpiece W.

[0023] In order to move the first processing tool 601 in the front-to-rear direction, the first processing unit 6 is provided with a slider 61 connected to the rear of the first processing tool 601. The slider 61 is provided with a plate-shaped first portion 611 extending in the left-to-right direction, and a plate-shaped second portion 612 connected to the right end of the first portion 611 and extending in the up-to-down direction. The second portion 612 is disposed near the center of the housing 5 in the left-to-right direction, and thus the first portion 611 is disposed on the left side of the housing 5. As shown in FIG. 4 , the first processing tool 601 is fixed so as to extend forward from the connecting portion between the first portion 611 and the second portion 612.

[0024] A plurality of first magnets 621 and a plurality of second magnets 622 are fixed to the upper and lower surfaces of the first portion 611 of the slider 61, respectively, and a first coil case 631 and a second coil case 632 are arranged above the first magnet 621 and below the second magnet 622, with a small gap between them.

[0025] Each coil case 631, 632 houses multiple coils (not shown), and a control device (not shown) can generate a magnetic force corresponding to the amount of current by varying and outputting the amount of current for a predetermined rotation angle so as to match the non-circular target shape. The multiple coils are arranged in a line at intervals in the front-to-rear direction, and are arranged so that their axial directions are perpendicular to the magnetization direction (front-to-rear direction) of the magnets 621, 622. In this embodiment, the axial directions of the coils are arranged in the up-and-down direction. When current is applied, the magnetic forces generated by the coils interact with the magnetic forces of the magnets 621, 622, causing the magnets 621, 622 to move in their magnetization direction (front-to-rear direction), and the slider 61 moves in the front-to-rear direction accordingly.

[0026] The winding direction of the coils can be changed as needed so that the slider 61 moves in the front-rear direction, and in this embodiment, adjacent coils are arranged so that their winding directions are opposite to each other.

[0027] A first cooling jacket 641 is fixed to the upper surface of the first coil case 631, and a rod-shaped first adjustment member 65 is attached between the upper surface of the first cooling jacket 641 and the top wall 54 of the housing 5. Meanwhile, a second cooling jacket 642 is fixed to the lower surface of the second coil case 632, and this second cooling jacket 642 is fixed to the bottom wall 55 of the housing 5. A refrigerant supplied from outside the processing unit 4 passes through each cooling jacket 641, 642, thereby cooling each coil case 631, 632. More specifically, a supply pipe 643 extending from the rear of the housing 5, passing through the rear wall 56, to the first cooling jacket 641 supplies the refrigerant to the first cooling jacket 641. A connecting pipe 644 is provided between the first and second cooling jackets 641, 642, so that the refrigerant discharged from the first cooling jacket 641 is supplied to the second cooling jacket 642. The refrigerant discharged from the second cooling jacket 642 is discharged to the outside of the housing 5 via a discharge pipe 645, returned to a storage tank (not shown), cooled again, and circulated through a supply pipe 643.

[0028] The first adjustment member 65 is, for example, like a turnbuckle, capable of adjusting its length with a tool, thereby adjusting the distance between the first coil case 631 and the first magnet 621 so as to moderate the effect of the magnetic force. A detectable portion 661 of a position sensor 66 extending in the front-rear direction is fixed to the left end of the first portion 611 of the slider 61, and a detecting portion 662 of the position sensor 66 extending in the front-rear direction along this detectable portion 661 is fixed to the housing 5. With this configuration, it is possible to detect the position of the slider 61 in the front-rear direction and output a feedback signal to the control device.

[0029] The second portion 612 of the slider 61 and the first side wall portion 52 of the housing 5 are connected via a first leaf spring 671 and a second leaf spring 672. The first leaf spring 671 is fixed to the front end of the second portion 612, and the second leaf spring 672 is fixed to the rear end of the second portion 612. Both leaf springs 671, 672 extend in the up-down and left-right directions. With this configuration, the slider 61 is supported by the first side wall portion 52 via the first leaf spring 671 and the second leaf spring 672.

[0030] As shown in FIG. 2, the first processing tool 601 has a cylindrical base 602 and a cutting tool 603 detachably fixed to the front end of the base 602, and the rear end of the base 602 is fixed to the front end of the slider 61. The base 602 extends forward from the slider 61 and protrudes forward through a through-hole (not shown) formed in the front wall 51 of the housing 5. A third leaf spring 673 is fixed to the left side of the base 602 protruding from the through-hole 511. The right end of the third leaf spring 673 is fixed to the base 602, and the left end is fixed to the left end of the front wall 51. In this way, the third leaf spring 673 is attached on the opposite side of the first leaf spring 671 and the second leaf spring 672 in the left-right direction across the first processing tool 601. The cutting tool 603 is selected to be capable of cutting the soft portion of the outer peripheral surface of the workpiece W shown in FIG. 1. With the above configuration, the first processing tool 601 is supported by the first to third leaf springs 671 to 673, and movement in the front-rear direction is restricted.

[0031] <4-2.Second processing section> Next, the second processing unit 7 will be described. The second processing unit 7 is disposed above the first processing unit 6, and has a configuration generally similar to that of the first processing unit 6. However, as shown in Figures 2 and 3, it is configured to be bilaterally symmetrical with the first processing unit 6. In other words, the first processing unit 6 is disposed mainly on the left side of the housing 5, while the second processing unit 7 is disposed mainly on the right side of the housing 5. This will be explained below.

[0032] The second processing unit 7 has a second processing tool 701 that cuts the outer peripheral surface of the workpiece W, and this second processing tool 701 moves in the front-to-rear direction. In other words, the second processing tool 701 moves close to and away from the workpiece W to process the workpiece W.

[0033] In order to move the second processing tool 701 in the front-to-rear direction, the second processing unit 7 is provided with a slider 71 connected to the rear of the second processing tool 701. The slider 71 is provided with a plate-shaped first portion 711 extending in the left-to-right direction, and a plate-shaped second portion 712 connected to the left end of the first portion 711 and extending in the up-to-down direction. The second portion 712 is located near the center of the housing 5 in the left-to-right direction, and therefore the first portion 711 is located on the left side of the housing 5. As shown in FIG. 4 , the second processing tool 701 is fixed so as to extend forward from the connecting portion between the first portion 711 and the second portion 712.

[0034] A plurality of first magnets 721 and a plurality of second magnets 722 are fixed to the upper and lower surfaces of the first portion 711 of the slider 71, respectively. A first coil case 731 and a second coil case 732 are respectively arranged above the first magnet 721 and below the second magnet 722 with a small gap therebetween. A first cooling jacket 741 is fixed to the upper surface of the first coil case 731, and this first cooling jacket 741 is fixed to the upper wall portion 54 of the housing 5. Meanwhile, a second cooling jacket 742 is fixed to the lower surface of the second coil case 732. A rod-shaped second adjustment member 75 is attached between the second cooling jacket 742 and the bottom wall portion 55 of the housing 5. The configuration for supplying refrigerant to each cooling jacket 741, 742 from a storage tank (not shown) via a supply pipe 743 is the same as that of the first processing unit 6, and therefore description thereof will be omitted.

[0035] The length of second adjustment member 75 can be adjusted with a tool such as a turnbuckle, thereby adjusting the distance between second coil case 732 and second magnet 722 to ensure an appropriate magnetic force. Second adjustment member 75 passes between first leaf spring 671 and second leaf spring 672 of first processing unit 6 and extends in the vertical direction.

[0036] A detected portion 761 of the position sensor 76 extending in the front-rear direction is fixed to the right end of the first portion 711 of the slider 71, and a detecting portion 762 of the position sensor 76 extending in the front-rear direction along this detected portion 761 is fixed to the housing. With this configuration, it is possible to detect the position of the slider 71 in the front-rear direction and output a feedback signal to the control device.

[0037] The second portion 712 of the slider 71 and the second side wall portion 53 of the housing 5 are connected via a first leaf spring 771 and a second leaf spring 772. The first leaf spring 771 is fixed to the front end of the second portion 712, and the second leaf spring 772 is fixed to the rear end of the second portion 712. Both leaf springs 771, 772 extend in the up-down and left-right directions. With this configuration, the slider 71 is supported by the second side wall portion 53 via the first leaf spring 771 and the second leaf spring 772. The first adjustment member 65 of the first processing unit 6 described above passes between the first leaf spring 771 and the second leaf spring 772 and extends in the up-down direction.

[0038] As shown in FIG. 2, the second processing tool 701 has a cylindrical base 702 and a tool tool 703 detachably fixed to the front end of the base 702, and the rear end of the base is fixed to the front end of the slider 71. The base 702 extends forward from the slider 71 and protrudes forward through a through-hole 512 (see FIG. 8) formed in the front wall 51 of the housing 5. The through-hole 512 is formed above the first processing tool 601. The base 702 is longer in the front-to-rear direction than the base 602 of the first processing tool 601 and protrudes further forward. A third leaf spring 773 is fixed to the right side of the base 702 protruding from the through-hole 512. The left end of the third leaf spring 773 is fixed to the base 702, and the right end is fixed to the right end of the front wall 51. In this way, the third leaf spring 773 is attached on opposite sides of the first leaf spring 771 and the second leaf spring 772 in the left-right direction across the second processing tool 701. The cutting tool 703 is selected to be capable of cutting the hard portion of the outer peripheral surface of the workpiece W shown in FIG.

[0039] With the above configuration, the first processing tool 601 and the second processing tool 701 are arranged side by side in the vertical direction along the rotation axis of the workpiece W, and the second processing tool 701 is configured to protrude further forward than the first processing tool 601.

[0040] The first side wall portion 52 and the second side wall portion 53 are respectively formed with first windows 52a, 53a and second windows 52b, 53b that lead to the inside of the housing 5. The first windows 52a, 53a are formed at approximately the same height so that the first adjustment member 65 and the second adjustment member 75 can be visually observed, and by inserting a tool such as a wrench through the first windows 52a, 53a, the lengths of the adjustment members 65, 75 can be adjusted as described above. The second windows 52b, 53b are at approximately the same height so that the position sensors 66, 76 can be visually observed, and a tool can be inserted through them to fine-tune the mounting positions of the detected parts 661, 761 and detecting parts 662, 762 of the position sensors 66, 76 back and forth.

[0041] <4-3. Structure to prevent intrusion of foreign objects> Because each of the processing units 6, 7 is configured with a precision linear actuator as described above, it is necessary to prevent the intrusion of foreign matter such as cutting chips that occur during processing. For this reason, a cover member 57 is attached to the front of the front wall portion 51 of the housing 5, which covers the third leaf springs 673, 773 of each of the processing units 6, 7. More specifically, through holes 571, 572 are formed in the cover member 57, through which the bases 602, 702 of the processing tools 601, 701 are inserted, and the bases protrude forward through these through holes 571, 572.

[0042] As shown in FIG. 8 , an annular seal member 58 is provided on the inner periphery of the through hole 512 for the second processing tool 701 in the front wall portion 51, and the inner circumferential surface of this seal member 58 is in contact with the outer circumferential surface of the base portion 602. Therefore, the base portion 702 is movable in the front-to-rear direction while being in contact with the seal member 58. An annular first groove 581 is formed on the inner circumferential surface of the seal member 58, and a supply path 514 for supplying air to this first groove 581 is formed in the front wall portion 51 and the upper wall portion 54. Therefore, when air is supplied to the first groove 581 through the supply path 514, a positive pressure air layer is formed around the base portion 702, which prevents foreign matter from entering the internal space of the housing 5 between the base portion 702 and the seal member 58. Additionally, on the inner circumferential surface of the seal member 58, a second groove 582 and a third groove 583, each having a semicircular cross section, are formed in front of and behind the first groove 581, so that air supplied to the first groove 581 is also supplied to these grooves 582 and 583. This further prevents foreign matter from entering.

[0043] The above is a structure for preventing foreign matter from entering the second processing tool 701, and a similar structure is also provided for the first processing tool 601. Although not shown in the drawings, air supplied to the first processing tool 601 passes through supply paths formed in the bottom wall portion 55 and the front wall portion 51.

[0044] <5. Operation of the processing equipment> Next, the operation of the processing device configured as described above will be described with reference to Figures 8 and 9. Below, an example will be described in which the surface of the annular member W4 of the workpiece W is first processed by the second processing tool 701, and then the surface of the workpiece W other than the annular member W4 is processed by the first processing tool 601.

[0045] First, the drive unit 3 is driven to move the machining unit 4 close to a predetermined position relative to the workpiece W. More specifically, as shown in FIG. 9 , the tip of the bit 703 of the second machining tool 701 is positioned opposite the upper edge of the annular member W4. Next, the workpiece W is rotated, and current is passed through the coil of the second machining unit 7 to move the slider 71 forward. At this time, the position of the slider 71 is detected by the position sensor 76, and the forward / backward position of the bit 703 is controlled by controlling the amount of current flowing in accordance with the rotation angle of the workpiece W. In this way, by moving the bit 703 forward and backward a predetermined amount according to the rotation angle of the workpiece W, the outer peripheral surface of the annular member W4 that comes into contact with the bit 703 is machined into a non-circular shape. By repeating this same forward / backward control cycle while moving the bit 703 downward by the thickness of the annular member W4, the entire outer peripheral surface of the annular member W4 is machined into a non-circular shape. Then, when the machining of the annular member W4 is completed, the tip of the cutting tool 603 of the first machining tool 601 is positioned to face the upper edge of the workpiece W, as shown in FIG.

[0046] Next, current is applied to the coil of the first processing unit 6 to move the slider 61 forward. At this time, the position of the slider 61 is detected by the position sensor 66, and the amount of current corresponding to the rotation angle of the workpiece W is controlled in the same manner as in the second processing unit 7 described above, thereby controlling the position of the cutting tool 603 in the forward and backward directions. In this way, by moving the cutting tool 603 downward while moving it forward and backward, the outer peripheral surface from the upper edge of the piston to the upper edge of the annular member W4 is machined into a non-circular shape that is the same as the shape of the annular member W4 after machining.

[0047] Subsequently, the cutting tool 603 is separated from the workpiece W, and the tip of the cutting tool 603 is positioned to face the lower edge of the annular member W4. Next, the cutting tool 603 is moved back and forth until it faces the lower edge of the workpiece W, thereby machining the surface of the piston below the annular member W4 into a non-circular shape that is the same as the shape of the annular member W4 after machining. This completes the machining of the workpiece.

[0048] Although an example has been described in which the outer diameter of the outer peripheral surface of the workpiece W is machined to be constant in the vertical direction, it is generally machined so that the outer diameter changes when viewed from the front, for example, to form a barrel shape.

[0049] <6. Features> The processing device configured as above has the following advantages. (1) Two types of processing tools 601, 701 are prepared depending on the object to be processed, and each is driven by a different drive mechanism 6, 7. This eliminates the moment load and imbalance that occurs when multiple processing tools are supported by a single drive mechanism, as in the conventional example, and improves processing accuracy. In addition, since there is no need to change tools during processing, it is possible to process the outer circumferential surface of the piston into a non-circular shape through a series of operations (one cycle).

[0050] (2) The first processing section 6 and the second processing section 7 are arranged vertically and symmetrically, and the processing tools 601, 701 are placed near the center of the two sections 6, 7, making it possible to make the processing unit 4 smaller.

[0051] (3) Each processing tool 601, 701 is supported by the first to third leaf springs 671-673, 771-773 arranged on the left and right sides, respectively, and therefore, it is possible to increase rigidity in the rotational direction of the workpiece W. As a result, it is possible to suppress vibration of the processing tools 601, 701 due to processing resistance, and therefore it is possible to improve processing accuracy.

[0052] (4) Since the tip of the first processing tool 601 is positioned rearward of the tip of the second processing tool 701, it is possible to prevent the first processing tool 601 from interfering with the main shaft 22 when processing the annular member W4 with the second processing tool 701.

[0053] <7. Variations> Although one embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications are possible without departing from the spirit of the present invention. The following modifications can be combined as appropriate.

[0054] (1) In the above embodiment, the bit 603 of the first processing tool 601 is disposed rearward of the bit 703 of the second processing tool 701, but the positions of the bits 603, 703 of each processing tool 601, 701 can be changed as appropriate depending on the spindle 22 and the workpiece W. For example, both bits 603, 703 can be disposed at the same position in the front-to-rear direction, or the bit 703 of the second processing tool 701 can be disposed rearward of the bit 603 of the first processing tool 601.

[0055] (2) In the above embodiment, each processing tool 601, 701 is supported by three leaf springs 671-673, 771-773, but the number and positions of the leaf springs are not particularly limited. Therefore, a leaf spring may be disposed on only one side of each processing tool 601, 701 in the left-right direction. However, depending on the processing conditions, it is preferable to dispose multiple leaf springs on either side of the processing tool 601, 701 to increase rigidity during processing.

[0056] (3) In the above embodiment, the bit 703 of the second processing tool 701 is used to process hard materials, and the bit 603 of the first processing tool 601 is used to process soft materials, but this is not particularly limited. That is, the bits 603, 703 provided on each processing tool 601, 701 can be changed as appropriate depending on the object to be processed. Furthermore, tools other than bits can also be attached as appropriate depending on the object to be processed and the processing conditions.

[0057] (4) In the above embodiment, the first processing unit 6 and the second processing unit 7 are arranged vertically and symmetrically in the left-right direction, but this is not particularly limited, and the structure and arrangement of each processing unit 6, 7 can be changed as appropriate as long as the first processing tool 601 and the second processing tool 701 are arranged in different positions.

[0058] (5) In the above embodiment, the workpiece to be machined is a piston, but other workpieces can also be machined. That is, the present invention can be applied to various machining operations, such as cutting the surface of a rotating workpiece while moving it toward or away from the workpiece. Therefore, machining operations other than machining a workpiece into a non-circular shape can also be performed. [Explanation of symbols]

[0059] 2: Work support unit 4: Processing unit 6: 1st processing section 601: 1st processing tool 61: Slider (first slider) 621: First magnet (first magnet) 622: Second magnet (first magnet) 671: First leaf spring (first leaf spring) 672: Second leaf spring (first leaf spring) 673: Third leaf spring (first leaf spring) 7:Second processing section 701:Second processing tool 71: Slider (second slider) 721: First magnet (second magnet) 722: Second magnet (Second magnet) 771: First leaf spring (second leaf spring) 772: Second leaf spring (Second leaf spring) 773: Third leaf spring (second leaf spring) W: Work

Claims

1. a workpiece support unit that supports a cylindrical workpiece so as to be rotatable around a first direction that is an axial direction of the workpiece; a machining unit configured to be movable in the first direction and to machine the workpiece; Equipped with The processing unit includes: a first processing unit having a first processing tool; a second processing unit disposed at a position different from the first processing unit along the first direction and having a second processing tool; Equipped with The first processing unit is a first slider connected to the first processing tool; a first leaf spring group having a plurality of leaf springs supporting the first slider; at least one first magnet fixed to the first slider; at least one first coil adjacent to the first magnet; Equipped with The first processing tool connected to the first slider is configured to move in a second direction approaching and moving away from the outer peripheral surface of the workpiece by interaction between the first coil and the first magnet, The second processing unit is a second slider connected to the second processing tool; a second leaf spring group having a plurality of leaf springs supporting the second slider; at least one second magnet fixed to the second slider; at least one second coil adjacent to the second magnet; Equipped with The second processing tool coupled to the second slider is configured to move in the second direction by interaction between the second coil and the second magnet, a third direction perpendicular to the first direction and the second direction; The first processing part is disposed below the second processing part, In the first processing unit, the first magnet and the first coil are arranged on one side of the first processing tool in the third direction, and at least one leaf spring of the first leaf spring group is arranged on the other side of the third direction, In the second processing unit, A processing device in which the second magnet and the second coil are arranged on the other side of the third direction, with the second processing tool sandwiched between them, and at least one leaf spring of the second leaf spring group is arranged on the one side of the third direction.

2. In the first processing section, At least one leaf spring of the first leaf spring group is also arranged on one side in the third direction so as to be aligned along the second direction with respect to the first magnet and the first coil, In the second processing unit, 2. The processing device according to claim 1, wherein at least one leaf spring of the second leaf spring group is also arranged on the other side of the third direction so as to be aligned along the second direction with respect to the second magnet and the second coil.

3. The processing device according to claim 1 or 2, wherein the first processing tool is configured to process a material that is harder than a material of the second processing tool.

4. The processing device according to claim 1 , wherein in the processing unit, the second processing tool is disposed closer to the workpiece than the first processing tool.

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