Disc correcting and trimming equipment

Abstract

The utility model discloses disc correcting and trimming equipment. The disc correcting and trimming equipment comprises a rack and a correcting assembly fixedly arranged on the rack. The correcting assembly comprises a positioning disc which is provided with a positioning face. The positioning disc is further provided with a central axis parallel to the horizontal plane, and a disc workpiece is configured to be coaxial with the positioning disc and attached to the positioning face. A correction disc; the correcting disc is arranged right opposite to the positioning surface and is coaxial with the positioning disc; the correcting disc is configured to axially move relative to the positioning disc; and when the correcting disc gets close to the positioning disc until the correcting disc abuts against the disc workpiece, the correcting disc corrects and shapes the annular edge of the disc workpiece. According to the scheme, the special correcting assembly is designed according to the structural characteristics of the disc workpiece, under the synergistic effect of the positioning disc and the correcting disc, fixing of the disc workpiece and correcting of the shape of the annular edge are completed, and forming of a notch in the next step is facilitated.

Description

Technical Field

[0001] The utility model relates to the field of laser cutting equipment, in particular to disc edge correction and trimming equipment. Background Art

[0002] At present, in the production of energy storage device covers, motor covers and other products in the new energy and photovoltaic industries, laser equipment is often required to perform hole opening, grooving and edge trimming.

[0003] like Figure 1 , Figure 2 As shown, the overall shape of the above-mentioned outer cover workpiece is similar to a disc, specifically including a chassis and a ring edge set on the edge of the chassis; the part that needs to be processed is the ring edge, and usually according to the design requirements of the product, the ring edge needs to be drilled, grooved, and chamfered.

[0004] However, due to the problem of processing accuracy, the ring edge set around the edge of the chassis may be partially deformed, that is, the shape of the ring edge is not close to a circle, which causes the incisions to be uneven and of different sizes when the ring edge is cut, which will seriously affect the subsequent installation accuracy.

[0005] Therefore, in order to meet product requirements, it is necessary to ensure the processing accuracy of the workpiece. How to ensure that the shape of the ring edge is close to a circle and the stability of the holes and grooves is a problem that needs to be solved at present. Utility Model Content

[0006] In view of the problems existing in the prior art, the utility model proposes a special equipment, that is, a disc correction and trimming equipment, on which components for correcting the ring edge are integrated, and a cutting component is also integrated; this not only ensures the accuracy of the incision forming, but also greatly improves the processing efficiency.

[0007] Specifically, the detailed technology proposed by the utility model is as follows:

[0008] A disc edge correction device comprises a frame and a correction component fixedly arranged on the frame; the correction component comprises

[0009] A positioning disk having a positioning surface; the positioning disk also has a central axis parallel to the horizontal plane, and the disc workpiece is configured to be coaxial with the positioning disk and fit with the positioning surface;

[0010] A correction disk; the correction disk is arranged opposite to the positioning surface and is coaxial with the positioning disk; the correction disk is configured to move axially relative to the positioning disk;

[0011] When the correction disk approaches the positioning disk until it abuts against the disc workpiece, the correction disk corrects and shapes the rim of the disc workpiece.

[0012] Furthermore, the positioning disk includes a positioning portion and a group of pin holes, the positioning portion is fixed on the positioning surface and protrudes an annular edge in the direction of the correction disk; the pin hole is arranged on the positioning portion; the positioning portion and the pin hole cooperate with the pin shaft to jointly position the disc workpiece and limit the axial rotation of the disc workpiece.

[0013] Furthermore, the correction assembly also includes a first transmission part, a bracket, a drive motor and a second transmission part, the bracket is fixed on the frame, and the first transmission part is sleeved in the bracket through a bearing; the positioning plate is connected and fixed to the first transmission part; the second transmission part is connected to the output end of the drive motor; the positioning plate is connected to the drive motor through the cooperation of the first transmission part and the second transmission part; the drive motor is configured to drive the positioning plate to rotate around its own central axis.

[0014] Furthermore, the positioning disc has various specifications, and each positioning disc of different types can be connected and fixed to the first transmission part by means of bolts.

[0015] Furthermore, the correction assembly also includes a support cylinder and a linear module, a support frame is mounted on the linear module, the support cylinder is rotatably connected to the support frame via a bearing, and the correction disk is coaxially connected to the support cylinder; the linear module is configured to drive the support cylinder to move along its own axis.

[0016] Furthermore, the correction disc has various specifications, and each correction disc of different types corresponds to the positioning disc one by one, and the correction disc can be connected and fixed to the support tube by bolts.

[0017] Furthermore, the support tube is a hollow cylindrical structure with two ends opened, one end of the support tube is fixed to the support frame and connected to the negative pressure device; the other end of the support tube is fixed to the correction disk.

[0018] Furthermore, the correction assembly also includes a filter, which is arranged between the correction disk and the support tube, and covers the opening of the support tube.

[0019] Furthermore, the correction assembly also includes a support plate and a steel ball; the support plate is V-shaped, fixed on the support frame and located below the support tube; the steel balls are respectively arranged on the two inner sides of the support plate, and the steel balls are partially embedded in the support plate and the other part is exposed outside the support plate; the steel balls are configured to support the rotation of the support tube.

[0020] Furthermore, the frame is also provided with a laser cutter and a multi-axis power module, and the multi-axis power module is configured to drive the laser cutter to adjust and move in the X-axis, Y-axis and Z-axis; the laser cutter is configured to cut the circumferential edge of the disc workpiece.

[0021] The beneficial effects achieved by adopting this technical solution are:

[0022] In this scheme, a special correction component is designed according to the structural characteristics of the disc workpiece. The positioning disk is used to perform preliminary positioning on the disc workpiece to limit the axial rotation of the disc workpiece; the correction disk is then used to approach until it abuts the disc workpiece. At this time, the correction disk not only corrects the shape of the ring edge, but also abuts the disc workpiece to limit the axial movement of the disc workpiece; in this way, under the coordinated action of the positioning disk and the correction disk, the fixation of the disc workpiece and the correction of the ring edge shape are completed, which is convenient for the formation of the next step of incision. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a three-dimensional structural diagram of the disc workpiece.

[0024] Figure 2 It is a side view of the disc workpiece.

[0025] Figure 3 This is the overall structure diagram of the disc correction and edge trimming equipment of this scheme.

[0026] Figure 4 This is the structural diagram of the correction components of this solution.

[0027] Figure 5 Schematic diagram of installing a disc workpiece on a positioning plate in a correction component.

[0028] Figure 6 This is the assembly structure diagram of the positioning plate and the bracket.

[0029] Figure 7 This is the assembly structure diagram of the positioning plate and the support tube.

[0030] Figure 8 It is a side view of the assembly of the positioning plate and the support tube.

[0031] Fig. 9 This is a schematic diagram of the structure of the equipment after installing the dust cover.

[0032] Among them: 100 chassis, 101 ring edge, 102 incision, 200 frame, 300 correction component, 310 positioning plate, 311 positioning part, 312 pin hole, 314 bracket, 315 drive motor, 320 correction plate, 321 support cylinder, 322 linear module, 323 support plate, 324 steel ball, 325 filter, 400 cutting component, 401 multi-axis power module, 402 laser cutter. DETAILED DESCRIPTION

[0033] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0034] In this embodiment, a disc correction and beveling device is provided, which is specially used for disc workpieces. The correction and beveling device of this scheme is used to correct the shape of the ring edge of the disc workpiece, and the cutting and beveling of the ring edge is completed at the same time of correction, thereby forming a high-precision incision shape.

[0035] Before introducing the equipment of this solution, the disc workpiece structure adapted by this solution is introduced first; for details, see Figure 1-Figure 2 The disc workpiece structure adapted by the device includes a chassis 100, which is disc-shaped and has a plurality of positioning holes for fixing the chassis 100 with the device through bolts; a ring edge 101 is formed at the edge of the chassis 100; the device provided by the present solution can correct and finalize the shape of the ring edge 101, as well as perform processing such as opening holes, grooving, and chamfering on the ring edge 101.

[0036] For better understanding, this embodiment takes the slotting process as an example. Figure 1-2 As shown, cutouts 102 are formed on the ring edge 101 by laser cutting, and the cutouts 102 are arranged in an array one by one on the ring edge 101 .

[0037] The following is a detailed introduction to the specific composition and structure of this equipment:

[0038] In this solution, the equipment is mainly composed of two parts: a correction component and a cutting component. The correction component is mainly used to correct and shape the ring edge 101 of the disc workpiece, shaping the ring edge 101 into a circular ring shape as much as possible to ensure the forming accuracy of the incision 102 in the subsequent cutting process.

[0039] For details, see Figure 3 The equipment includes a frame 200, a correction component 300 and a cutting component 400, wherein a substrate is fixedly installed on the upper plane of the frame 200, and the substrate will serve as a mounting plate for the correction component 300 and the cutting component 400, so that the correction component 300 and the cutting component 400 are stably fixed to the frame 200, while also ensuring the installation accuracy of the correction component 300 and the cutting component 400.

[0040] Among them, see Figure 4-Figure 5The correction component 300 includes a positioning plate 310 and a correction plate 320. The positioning plate 310 is mainly used to position the disc workpiece so that the disc workpiece can be initially stabilized; the correction plate 320 has two functions. First, to correct and shape the ring edge 101 of the disc workpiece, especially to correct the degree of deformation of the ring edge 101; second, to reposition the disc workpiece and complete the complete positioning of the disc workpiece by cooperating with the positioning plate 310, that is, the disc workpiece is completely fixed.

[0041] Specifically, the positioning disk 310 has a positioning surface; the positioning surface is used for fitting the disc workpiece, and the positioning disk 310 also has a central axis parallel to the horizontal plane, and the disc workpiece is configured to be coaxial with the positioning disk 310 and fit with the positioning surface; it can be understood that the positioning disk 310 here is not placed horizontally, but is presented in a vertical manner, and the central axis of the vertically arranged positioning disk 310 is not perpendicular to the horizontal plane, but parallel to the horizontal plane. Such a setting structure will enable the disc workpiece to be initially positioned on the positioning disk 310 with its axis also parallel to the horizontal plane.

[0042] Specifically, the correction disk 320 is arranged opposite to the positioning surface of the positioning disk 310 and is coaxial with the positioning disk 310; the correction disk 320 is configured to move axially relative to the positioning disk 310; the axial movement here specifically refers to the movement forward or backward along the axial direction; when the correction disk 320 approaches the positioning disk 310 until it abuts against the disc workpiece, the correction disk 320 corrects and shapes the annular edge of the disc workpiece.

[0043] It can be understood that the disc workpiece first completes the initial positioning on the positioning disk 310. At this time, the ring edge 101 of the disc workpiece is facing the correction disk 320. The disc diameter of the correction disk 320 is just adapted to the inner diameter of the ring edge 101. In the process of the correction disk 320 gradually approaching, the correction disk 320 will gradually embed into the ring edge 101, which can just stably improve the shape of the ring edge 101. As the correction disk 320 continues to gradually approach until it abuts against the bottom plate 100 of the disc workpiece, the disc workpiece is completely fixed under the dual action of the positioning disk 310 and the correction disk 320, and at this time, the correction disk 320 is still embedded in the inner side of the ring edge 101 to maintain the shaping state of the ring edge 101.

[0044] In order to facilitate a detailed understanding of the present solution, the composition of the positioning plate 310 and the correction plate 320 are introduced below.

[0045] See also Figure 4 , Figure 6The positioning disk 310 includes a positioning portion 311 and a group of pin holes 312 arranged on the positioning portion 311. The positioning portion 311 is fixed on the positioning surface and protrudes an annular edge in the direction of the correction disk 320; the positioning portion 311 is used to complete the initial positioning of the disc workpiece; a positioning hole is provided at a corresponding position on the disc workpiece, so that when the disc workpiece is placed in the positioning portion 311, the positioning hole is aligned with the pin hole 312, and then the disc workpiece is fixed to the positioning portion 311 using bolts or pins; that is, under the joint action of the positioning portion 311 and the pin hole 312, the disc workpiece is positioned and restricted and cannot rotate around its own center axis.

[0046] The correction disk 320 can just abut the disc workpiece in the direction of the axis to limit the axial movement of the disc workpiece; therefore, it is not difficult to conclude that the disc workpiece is restricted from rotating and moving axially, and the disc workpiece is completely fixed at this time.

[0047] In a specific embodiment of the present scheme, the correction component 300 also includes a first transmission part (not shown), a bracket 314, a drive motor 315 and a second transmission part (not shown), the bracket 314 is fixed on the frame 200, and the first transmission part is sleeved in the bracket 314 through a bearing; the positioning plate 310 is connected and fixed to the first transmission part; the second transmission part is connected to the output end of the drive motor 315; the positioning plate 310 is connected to the drive motor 315 through the cooperation of the first transmission part and the second transmission part; the drive motor 315 is configured to drive the positioning plate 310 to rotate around its own central axis.

[0048] It can be understood that: the driving motor 315 outputs power, and with the cooperation of the first and second transmission parts, drives the positioning plate 310 transmission-connected thereto to rotate.

[0049] The positioning disk 310 is designed to rotate in order to achieve the cutting of the annular edge 101; because the incision 102 is cut and formed around the annular edge 101, the disc workpiece needs to rotate, that is, each time an incision 102 is cut, the drive motor 315 drives the disc workpiece to rotate a preset angle, and then cuts to form another incision 102, and so on and so forth, until the disc workpiece rotates one circle, at which time a surrounding incision 102 is formed on the annular edge 101.

[0050] In a specific embodiment, the first transmission part and the second transmission part can be large and small gears, that is, the first transmission part (large gear) is installed in the bracket 314 through a rotating bearing, and the positioning plate 310 is fixedly connected to the end face of the large gear by bolts; the second transmission part (small gear) is installed and fixed on the output shaft of the driving motor 315; the large and small gears are meshed with each other, and under the power of the driving motor 315, the rotation of the positioning plate 310 is realized by gear transmission.

[0051] In the embodiment of this solution, the positioning disc 310 is detachably connected and fixed to the first transmission part. The purpose is to facilitate the adaptation of positioning discs 310 of different specifications; that is, there are many specifications of positioning discs, which may be large or small in size, but the final structure is similar; therefore, here it is only necessary to select a suitable positioning disc 310 and the first transmission part for installation and fixing according to the size of the disc workpiece.

[0052] See also Figure 4 , Figure 7 The correction component 300 also includes a support cylinder 321 and a linear module 322, on which a support frame is installed, wherein the support cylinder 321 is rotatably connected to the support frame through a bearing, and the correction disk 320 is coaxially connected to the support cylinder 321; the linear module 322 is configured to drive the support cylinder 321 to move along its own axial direction.

[0053] It can be understood that: the correction disk 320 is connected and fixed to the support tube 321, and the support tube 321 can also move back and forth along the axial direction under the action of the linear module 322; that is, after the initial positioning is completed on the disc workpiece positioning disk 310, the linear module 322 drives the correction disk 320 to approach the positioning disk 310. In the process of approaching, the correction disk 320 will correct and shape the shape of the ring edge 101 until the end face of the correction disk 320 is completely in contact with the end face of the disc workpiece; waiting for the cutting action of the cutting assembly 400.

[0054] It should be noted that when the cutting assembly 400 is used for cutting in the present solution, the correction disk 320 does not withdraw, that is, the correction disk 320 is still embedded in the ring edge 101 at this time, maintaining the correction state of the ring edge 101; cutting in such a state effectively ensures the forming accuracy of the incision 102.

[0055] At the same time, because the driving motor 315 will drive the disc workpiece to rotate during the cutting process, the correction disc 320 in this solution needs to follow it; that is, in the preferred solution, the support cylinder 321 is rotatably connected to the support frame through a bearing connection, so that the support cylinder 321 is configured to be able to rotate axially freely. When the disc workpiece is rotated, the correction disc 320 maintains the correction shape of the ring edge 101 and can also rotate together.

[0056] In order to adapt to disc workpieces of different specifications, the correction disc 320 here also has multiple specifications. Each different type of correction disc 320 corresponds to the positioning disc 310 one by one, and the correction disc 320 can be connected and fixed to the support tube 321 by bolts.

[0057] Optionally, the support tube 321 is a hollow structure with openings at both ends, one end of the support tube 321 is connected to the support frame and connected to the negative pressure device; the other end of the support tube 321 is fixed to the correction disk 320.

[0058] It is not difficult to conclude that the support tube 321 is designed to be a hollow structure with both ends open, which has two effects. First, it can reduce the weight of the support tube 321; second, when the negative pressure equipment is started, the support tube 321 is filled with suction, which can suck the chips generated during the cutting process to the outside.

[0059] Optionally, the correction component 300 also includes a filter 325, which is arranged between the correction disk 320 and the support tube 321. At the same time, the filter covers the opening of the support tube 321, which can effectively isolate the waste generated during the cutting process and avoid the scattering of waste residues during the cutting process.

[0060] Optional, see Figure 8 The correction component also includes a support plate 323 and a steel ball 324; the support plate 323 and the steel ball 324 cooperate to effectively support the cylindrical support tube 321.

[0061] Specifically, the cross-section of the support plate 323 is V-shaped, the support plate 323 is fixed on the support frame and is located below the support tube 321; steel balls 324 are respectively provided on the two inner side surfaces of the support plate 323, and part of the steel balls 324 are embedded in the support plate 323 and the other part is exposed outside the support plate 323; the steel balls 324 are configured to assist in the rotation and support of the support tube 321.

[0062] Such a design allows both steel balls 324 to contact the support tube 321. At the same time, because the correction disk 320 is fixed at the far end of the support tube 321, it is in a cantilever state. At the bottom position of the support tube 321 near the far end, a rolling steel ball 324 is set, and the support plate 323 is used to provide effective support. In this way, when the support tube 321 rotates, the two steel balls 324 rotate with it and can effectively support the support tube 321.

[0063] In the embodiments of this scheme, see Figure 3 The cutting assembly 400 includes a laser cutter 402 and a multi-axis power module 401. Specifically, the laser cutter 402 and the multi-axis power module 401 are fixed on the base plate of the frame, and the multi-axis power module 401 is configured to drive the laser cutter 402 to adjust and move in the X-axis, Y-axis and Z-axis; at the same time, the laser cutter 402 is configured to cut the ring edge 101 of the disc workpiece. According to the preset program, the laser cutter 402 is driven by the multi-axis power module 401 to adjust and move in the X-axis, Y-axis and Z-axis to facilitate cutting and forming the incision 102 on the ring edge 101.

[0064] For ease of understanding, here is a summary of how this device works:

[0065] S1: Align the disc workpiece with the positioning portion 311 and the pin hole 312 on the positioning plate 310, and then fix it with bolts or pins, so that the disc workpiece completes the initial positioning on the positioning plate 310 and is restricted from axial rotation.

[0066] S2: The linear module 322 is started, driving the correction disk 320 to move toward the positioning disk 310; during the movement, the annular side of the correction disk 320 will gradually correct and shape the annular edge 101 of the disc workpiece, reducing the degree of deformation of the annular edge 101; the correction disk 320 continues to move until it abuts against the base plate 100 of the disc workpiece, and the axial movement of the disc workpiece is restricted. At this time, the disc workpiece has been completely fixed.

[0067] S3: The multi-axis power module 401 is started, driving the laser cutter 402 to move to the top of the disk workpiece ring edge 101.

[0068] S4: The driving motor 315 is started to drive the disc workpiece to start rotating around the axis; at this time, the laser cutter 402 is also started and stopped intermittently, and during the rotation of the disc workpiece, the ring edge 101 is cut to form the incision 102.

[0069] S5: When the cutting program is started, the external negative pressure device is started to suck away the waste chips generated during the cutting process.

[0070] S6: Continue the operation until the cutting of one disc workpiece is completed; the linear module 322 drives the correction disk 320 to retreat, and then removes the disc workpiece, and the processing of one disc workpiece is completed; then repeat steps S1-S5 to complete the cutting of another disc workpiece.

[0071] At the same time, if Fig. 9 As shown, in this solution, a dust cover can be provided on the frame 200, and the dust cover covers the entire operating space, so that the internal space is closed and plays a dust-proof role.

[0072] According to the structural characteristics of the disc workpiece, this technical solution designs a special correction component, which uses a positioning plate to perform preliminary positioning on the disc workpiece to limit the axial rotation of the disc workpiece; then the correction plate is used to approach until it abuts the disc workpiece. At this time, the correction plate not only corrects the shape of the ring edge, but also abuts the disc workpiece to limit the axial movement of the disc workpiece; in this way, under the coordinated action of the positioning plate and the correction plate, the disc workpiece is fixed and the shape of the ring edge is corrected, and then the cutting component is used to perform processing such as opening holes, grooving, and chopping edges.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A disc straightening and edge trimming device, comprising a frame (200) and a straightening assembly (300) fixedly arranged on the frame (200); characterized in that: The correction assembly (300) comprises A positioning disk (310) having a positioning surface; the positioning disk (310) also has a central axis parallel to a horizontal plane, and the disc workpiece is configured to be coaxial with the positioning disk (310) and to fit the positioning surface; a correction disk (320); the correction disk (320) is arranged opposite to the positioning surface and is coaxial with the positioning disk (310); the correction disk (320) is configured to move axially relative to the positioning disk (310); When the correction disk (320) approaches the positioning disk (310) until it abuts against the disc workpiece, the correction disk (320) corrects and shapes the annular edge (101) of the disc workpiece.

2. A disc edge correction device according to claim 1, characterized in that: The positioning disk (310) comprises a positioning portion (311) and a group of pin holes (312); the positioning portion (311) is fixed on the positioning surface and has an annular edge protruding in the direction of the correction disk (320); the pin holes (312) are arranged on the positioning portion (311); the positioning portion (311) and the pin holes (312) cooperate with the pin shaft to jointly position the disc workpiece and limit the axial rotation of the disc workpiece.

3. A disc edge correction device according to claim 2, characterized in that: The correction component (300) further comprises a first transmission part, a bracket (314), a drive motor (315) and a second transmission part, wherein the bracket (314) is fixed on the frame (200), and the first transmission part is sleeved in the bracket (314) via a bearing; the positioning plate (310) is connected and fixed to the first transmission part; the second transmission part is connected to the output end of the drive motor (315); the positioning plate (310) is transmission-connected to the drive motor (315) through the cooperation of the first transmission part and the second transmission part; and the drive motor (315) is configured to drive the positioning plate (310) to rotate around its own central axis.

4. A disc edge correction device according to claim 3, characterized in that: The positioning plate (310) has various specifications, and each positioning plate of different types can be connected and fixed to the first transmission part by means of bolts.

5. A disc edge correction and chamfering device according to any one of claims 1 to 4, characterized in that: The correction component (300) also includes a support cylinder (321) and a linear module (322), wherein a support frame is mounted on the linear module (322), the support cylinder (321) is rotatably connected to the support frame via a bearing, and the correction disk (320) is coaxially connected to the support cylinder (321); the linear module (322) is configured to drive the support cylinder (321) to move along its own axis.

6. A disc edge correction device according to claim 5, characterized in that: The correction disc (320) has various specifications, and each correction disc (320) of different types corresponds to the positioning disc (310) one by one, and the correction disc (320) can be connected and fixed to the support tube (321) by means of bolts.

7. The disc edge correction device according to claim 6, characterized in that: The support tube (321) is hollow and has openings at both ends; one end of the support tube (321) is fixed to the support frame and connected to the negative pressure device; the other end of the support tube (321) is fixed to the correction disk (320).

8. The disc edge correction and trimming device according to claim 7, characterized in that: The correction assembly (300) further comprises a filter (325), wherein the filter (325) is arranged between the correction disk (320) and the support tube (321), and the filter (325) covers the opening of the support tube (321).

9. The disc edge correction device according to claim 8, characterized in that: The correction component (300) further comprises a support plate (323) and a steel ball (324); the support plate (323) is V-shaped, fixed on the support frame and located below the support tube (321); the steel balls (324) are respectively arranged on the two inner side surfaces of the support plate (323), and a portion of the steel balls (324) is embedded in the support plate (323) and another portion is exposed outside the support plate (323); the steel balls (324) are configured to support the rotation of the support tube (321).

10. The disc edge correction and chamfering device according to claim 9, characterized in that: The frame (200) is also provided with a laser cutter (402) and a multi-axis power module (401), wherein the multi-axis power module (401) is configured to drive the laser cutter (402) to adjust and move along the X-axis, the Y-axis and the Z-axis; and the laser cutter (402) is configured to cut the annular edge (101) of the disc workpiece.

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