Sheet metal working method and mold for sheet metal working

Abstract

To provide a sheet metal working method which prevents working frequency from becoming high and a working time from becoming long when a projection part for preventing a product from sinking and riding over a surplus material is formed independently upward and downward.SOLUTION: A sheet metal working method includes: a cutting step which cuts an outline of a product (WP) to be cut out from a sheet metal (W) by leaving a part to provide slits (Wm1, Wm2) and forms a product intermediary body (WR) connected to the remaining material (WS) in part; a projection forming step which forms a first projection (E1) projecting downward and a second projection (E2) projecting upward at edges of the slits (Wm1, Wm2) in the remaining material (WS); and a product separation step which cuts a part and cuts out the product intermediary body (WR) as the product (WP) from the remaining materials (WS).SELECTED DRAWING: Figure 2C

Description

[Technical field]

[0001] The present invention relates to a sheet metal working method and a die for sheet metal working. [Background technology]

[0002] A multi-tasking machine that performs both punching and laser processing on sheet metal is known. Patent Document 1 describes a processing method using this multi-tasking machine to form protruding parts on the lower and upper sides of a product cut from the sheet metal, preventing the part from slipping under the remaining material and climbing over the remaining material.

[0003] The processing method described in Patent Document 1 involves forming an upward protrusion and a downward protrusion independently of each other on an end portion of a remnant material, including a cut surface, with a lance or the like. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 7084829 Summary of the Invention [Problem to be solved by the invention]

[0005] The processing method described in Patent Document 1, which independently forms upward and downward protrusions on a product, requires many processing steps and takes a long time, so there is room for improvement. [Means for solving the problem]

[0006] In order to solve the above problems, a first aspect of the present invention has the following configuration. That is, the sheet metal processing method includes a cutting step of cutting the outline of a product to be cut out from sheet metal to form a slit while leaving a portion thereof, and forming a product intermediate connected to a remaining material at the portion, a protrusion forming step of forming a protrusion having a first protrusion protruding downward and a second protrusion protruding upward at an edge of the slit in the remaining material, and a product separating step of cutting the portion and cutting out the product intermediate from the remaining material as a product. Also, a second aspect of the present invention has the following configuration. That is, the die includes a die having a die ejector and a tip portion which moves up and down relative to the die ejector, and a punch which has a punch holding member and a punch receiving member and a punch tip which move up and down independently and relatively to the punch holding member, and is arranged to move up and down above the die, wherein the die ejector supports from below a sheet metal workpiece arranged between the die and the punch which are spaced apart in the vertical direction, and by lowering the punch to a first position, the punch holding member presses the workpiece downward and the die ejector is lowered while the tip portion moves upward relatively, sandwiching a first range of the workpiece between the punch receiving member and pushing it upward to form an upward protrusion which protrudes upward, and by maintaining the punch at the first position, moving the punch tip downward relative to the punch holding member, a second range of the workpiece is pushed downward to form a downward protrusion which protrudes downward. Effect of the Invention

[0007] According to one aspect of the present invention, when forming a protrusion that prevents a product cut out from sheet metal from sinking into the remaining material and a protrusion that prevents the product from climbing over it, the number of processing steps can be reduced and the processing time can be shortened. [Brief description of the drawings]

[0008] [Figure 1A] FIG. 1A is a diagram showing a sheet metal working system ST for executing one embodiment of the sheet metal working method of the present invention. [Figure 1B]FIG. 1B is a block diagram of a control device 2 provided in the sheet metal processing system ST. [Figure 2A] FIG. 2A is a diagram showing a state at the end of a first step of a processing method for obtaining a product WP from a workpiece W by a sheet metal processing system ST. [Figure 2B] FIG. 2B is a diagram showing the state at the end of the second step. [Figure 2C] FIG. 2C shows the state at the end of the third step. [Figure 3A] FIG. 3A is an enlarged view of part A in FIG. 2B. [Figure 3B] FIG. 3B is a front view of the protrusion E formed in the second step. [Figure 3C] FIG. 3C is a perspective view of the protrusion E. [Figure 3D] FIG. 3D is a cross-sectional view taken along the line S3D-S3D of FIG. 3A. [Figure 3E] FIG. 3E is a cross-sectional view taken along the line S3E-S3E of FIG. 2C. [Figure 4A] FIG. 4A is a perspective view showing a protrusion forming die 5 constituting a protrusion forming die K56 which is one embodiment of the die for sheet metal working of the present invention. [Figure 4B] FIG. 4B is a partially enlarged plan view of the protrusion forming die 5. As shown in FIG. [Figure 5A] FIG. 5A is a perspective view showing the lower part of the protrusion forming punch 6 constituting the protrusion forming die K56. [Figure 5B] FIG. 5B is a partial bottom view of the protrusion-forming punch 6. FIG. [Figure 6A] FIG. 6A is a vertical cross-sectional view for explaining a first forming step for forming a protrusion E on a workpiece W using a protrusion forming die K56. [Figure 6B] FIG. 6B is a vertical cross-sectional view for explaining the second forming step. [Figure 6C] FIG. 6C is a vertical cross-sectional view for explaining the third forming step. [Figure 6D] FIG. 6D is a vertical cross-sectional view for explaining the fourth forming step. [Figure 6E]FIG. 6E is an enlarged view of the vicinity of the first protrusion E1 in FIG. 6D. [Figure 7] FIG. 7 is a front view showing a protrusion EA which is a modified example of the protrusion E. As shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] A sheet metal working die and a sheet metal working method according to an embodiment of the present invention will be described with reference to FIGS. 1 to 6E using sheet metal working executed by a sheet metal working system ST.

[0010] FIG. 1A is a diagram showing a sheet metal processing system ST for executing one embodiment of the sheet metal processing method of the present invention. FIG. 1B is a block diagram of a control device 2 provided in the sheet metal processing system ST. FIG. 2A is a diagram showing a state at the end of a first step of a processing method for obtaining a product WP from a workpiece W by the sheet metal processing system ST. FIG. 2B is a diagram showing a state at the end of a second step. FIG. 2C is a diagram showing a state at the end of a third step. FIG. 3A is an enlarged view of part A in FIG. 2B. FIG. 3B is a front view of a protrusion E formed in the second step. FIG. 3C is a perspective view of the protrusion E. FIG. 3D is a cross-sectional view at the S3D-S3D position in FIG. 3A. FIG. 3E is a cross-sectional view at the S3E-S3E position in FIG. 2C. FIG. 4A is a perspective view showing a protrusion forming die 5 constituting a protrusion forming die K56, which is one embodiment of a die for sheet metal processing of the present invention. FIG. 4B is a partially enlarged plan view of the protrusion forming die 5. FIG. 5A is a perspective view showing a lower part of a protrusion forming punch 6 constituting the protrusion forming die K56. Fig. 5B is a partial bottom view of the protrusion forming punch 6. Fig. 6A is a vertical cross-sectional view for explaining a first forming step of forming a protrusion E in a workpiece W using a protrusion forming die K56. Fig. 6B is a vertical cross-sectional view for explaining a second forming step. Fig. 6C is a vertical cross-sectional view for explaining a third forming step. Fig. 6D is a vertical cross-sectional view for explaining a fourth forming step. Fig. 6E is an enlarged view of the vicinity of the first protrusion E1 in Fig. 6D.

[0011] First, the overall configuration of the sheet metal processing system ST will be described with reference to Fig. 1. For ease of explanation, the up, down, left and right directions are defined as the directions of the arrows shown in Fig. 1. The front-rear direction is the front-rear direction of the paper, with the front being the front of the paper and the rear being the back of the paper.

[0012] The sheet metal processing system ST includes a multi-tasking machine 1, a control device 2, and a transport device 3. The multi-tasking machine 1 has a work table 11, a punch processing section 12, and a laser processing section 13. A workpiece W, which is sheet metal, is placed on the top of the work table 11. The workpiece W is gripped by a clamper (not shown) and transported in the left-right direction (see arrow DR1). The workpiece W is transported leftward from the position shown in FIG. 1 and supplied to the punch processing section 12.

[0013] The punch processing unit 12 has a lower turret 121 and an upper turret 122 . A die KD is attached to the lower turret 121, and a punch KP that forms a pair with the die KD is attached to the upper turret 122. A protrusion-forming die 5 is also attached to the lower turret 121, and a protrusion-forming punch 6 is also attached to the upper turret 122. The protrusion-forming die 5 will hereinafter also be referred to simply as the die 5. The protrusion-forming punch 6 will hereinafter also be referred to simply as the punch 6.

[0014] The pair of dies, the die KD and the punch KP, cooperate with each other to perform punching on the workpiece W supplied between the lower turret 121 and the upper turret 122 by the operation of a die drive unit (not shown).

[0015] The protrusion forming die 5 and the protrusion forming punch 6 constitute a protrusion forming die K56 as a die set. The protrusion forming die K56 forms protrusions E shown in Figs. 2B to 3C at the edges of slits Wm1, Wm2 (see Fig. 2B) of the workpiece W supplied between the lower turret 121 and the upper turret 122 by the operation of a die driving unit (not shown). The slits Wm1, Wm2 are formed by a laser beam LS (see Fig. 1) as part of the outline of the product WP to be cut out, as described later.

[0016] Returning to FIG. 1, during processing in the punch processing section 12, the workpiece W moves in both the left-right and front-back directions, and processing such as punching is performed on any position of the workpiece W by the selected set of dies.

[0017] The laser processing unit 13 is disposed above the work table 11 and has a laser processing head 131 that is movable in the front-rear direction. The laser processing head 131 emits a laser beam LS from its lower end toward the work table 11. The work W moves left-right on the work table 11 and the laser processing head 131 moves back-rear, whereby laser processing is performed on any position of the work W.

[0018] The conveying device 3 is installed on the opposite side of the work table 11 to the punching unit 12 and the laser processing unit 13. In this example, the punching unit 12 and the laser processing unit 13 are installed on the left side of the work table 11, and the conveying device 3 is installed on the right side.

[0019] The transport device 3 has an arm 31 and a suction unit 32. The arm 31 moves in the left-right direction (see arrow DR2) and the up-down direction (arrow DR3). The suction unit 32 is attached to the lower end of the arm 31, and has a plurality of suction cups 321 arranged two-dimensionally in the horizontal direction and facing downward. The transport device 3 is equipped with a suction device (not shown) that sucks air from the ends of the suction cups 321.

[0020] The conveying device 3 sucks and holds the workpiece W on the worktable 11 with a plurality of suction cups 321, and carries the workpiece W to a predetermined position by raising and lowering and horizontally moving the arm 31. In addition, a workpiece W to be processed is carried in from outside and placed on the worktable 11 by a similar operation.

[0021] The control device 2 has a control unit 21, a general allocation unit 7, an input unit 73, and an output unit 74. The control unit 21 controls the overall operation of the sheet metal processing system ST. The general allocation unit 7 generalizes the allocation of processing positions using the protrusion forming die K56 and the like for the contour of the product WP to be cut out of the workpiece W. The input unit 73 has a communication unit that communicates with external devices, and an input terminal that allows direct input by the worker. The output unit 74 has an output device such as a display, and outputs the operating status, setting information, etc. of the sheet metal processing system ST.

[0022] The general allocation unit 7 is a computer having a central processing unit (hereinafter, CPU (Central Processing Unit) 71) and a memory unit 72. The CPU 71 has an allocation unit 711. The memory unit 72 has a die data storage unit 724 and a product information storage unit 727. The allocation unit 711 obtains information on the die attached to the punch processing unit 12 and the outline of the product to be cut out from the information stored in the die data storage unit 724 and the product information storage unit 727, respectively, in accordance with an allocation program previously stored in the memory unit 72, and automatically allocates processing positions by the die according to the information. The allocation of processing positions by the die may be manually performed by an operator via the input unit 73.

[0023] The sheet metal processing system ST performs processing to cut out a product WP from a sheet metal workpiece W in the steps shown in Fig. 2A to Fig. 2C. Here, an example of processing to cut out a rectangular product WP that is long in the left-right direction from the workpiece W will be described. This processing is performed under the control of the control device 2.

[0024] (1st step) As shown in Fig. 2A, a pair of long sides of the rectangular outline of the workpiece W that will become the product WP is cut by a laser beam LS to form slits Wm1 and Wm2. One of the short sides of the outline is set as the final cutting line Ta that will be cut last, and the other is set as the pre-final cutting line Tb that will be cut just before the final cutting line Ta. When this first process is completed, the rectangular portion that will become the product WP becomes a product intermediate body WR in which the short sides of the outline are connected to the remnant material WS that is the base material on the workpiece W side.

[0025] (2nd process) As shown in Fig. 2B, positions for forming protrusions E are allocated to the edges of the remnant material WS corresponding to the slits Wm1, Wm2 formed in the first process, and the protrusions E are formed at the allocated positions by the protrusion forming die K56. The allocation of the positions for forming the protrusions E is performed by the general allocation unit 7, as described above. In this example, the positions for forming the protrusions E are allocated to positions spaced apart in the longitudinal direction (left-right direction) of the intermediate product WR, and two protrusions E are allocated to each of the slits Wm1 and Wm2, facing each other in the front-rear direction. The control device 2 forms the protrusions E at the allocated positions by the protrusion forming die K56.

[0026] The four protrusions E shown in FIG. 2B have the same shape, and the protrusion E at the left rear of FIG. 2B will be described with reference to FIGS. 3A to 3D. The protrusion E has a first protrusion E1 and a second protrusion E2. The first protrusion E1 and the second protrusion E2 are formed by a so-called cut-and-raise process. The first protrusion E1 is formed as a downward convex, and the second protrusion E2 is formed as an upward convex, adjacent to each other. As a result, as shown in FIG. 3B, the boundary position Ps between the first protrusion E1 and the second protrusion E2 is a sheared cut portion SLt. Hereinafter, the first protrusion E1 is also referred to as a downward protrusion, and the second protrusion E2 is also referred to as an upward protrusion.

[0027] As shown in Figures 3A to 3D, the first protrusion E1 has a flat plate portion E1a that protrudes downward from the remaining material WS by approximately the plate thickness and extends parallel to the remaining material WS, and an inclined portion E1b that is inclined and connected to the left edge and rear edge of the flat plate portion E1a and the remaining material WS. An indentation E1d that is carved upward is formed on the underside of the flat plate portion E1a. A protrusion E1c is formed at the front edge of the flat plate portion E1a and protrudes forward. The protrusion E1c is a portion that extends forward due to plastic flow associated with the formation of the indentation E1d.

[0028] The second protrusion E2 protrudes upward from the remaining material WS by approximately the thickness of the plate, and has a flat portion E2a extending parallel to the remaining material WS, and an inclined portion E2b that is inclined and connected to the right edge and rear edge of the flat portion E2a and the remaining material WS. A downward indentation E2d is formed on the upper surface of the flat portion E2a. A protrusion E2c is formed at the front edge of the flat portion E2a and protrudes forward. The protrusion E2c is a portion that extends forward due to plastic flow associated with the formation of the indentation E2d.

[0029] (3rd step) When the protrusion E is formed at the allocation position and the second step is completed, the laser beam LS cuts the pre-final cutting line Tb to make a slit Wm3, and then cuts the final cutting line Ta to make a slit Wm4, as shown in Fig. 2C. As a result, the outline is completely cut by the slits Wm1 to Wm4, and the product WP is separated from the remnant material WS, and the third step is completed.

[0030] 3A and 3D, the protrusion E1c extends so as to penetrate into the underside of the intermediate product WR. Moreover, the protrusion E2c extends so as to cover the upper surface of the intermediate product WR. As a result, at the end of the second process, the protrusion E1c prevents the intermediate product WR from bending downward due to its own weight, and the protrusion E2c prevents the intermediate product WR from lifting upward due to an external force.

[0031] In addition, at the end of the third process, the product WP obtained by cutting the entire outline is restricted in its downward movement by the protrusions E1c of the multiple protrusions E shown in Fig. 2C, and its upward movement by the protrusions E2c. The horizontal movement of the product WP is restricted by the end face of the product WP abutting against the slit end face WSt of the remnant material WS.

[0032] 3A and 3D, when the cut product WP tries to move backward due to the application of an external force, the rear end face of the product WP comes into contact with the slit end face WSt of the slit Wm1 in the remaining material, restricting the product WP from moving backward beyond the width of the slit Wm1. Similarly, the product WP moves forward beyond the width of the slit Wm2, and is restricted by the slit end face WSt of the slit Wm2.

[0033] Also, the protrusions E are not formed on the edges of the remnant material WS that correspond to the short sides of the product WP. However, as shown in Fig. 3E, the left and right end faces of the product WP abut against the end faces of the remnant material WS facing them, so that the leftward and rightward movements of the product WP are restricted, because the product WP is supported at the same height as the remnant material WS.

[0034] In this way, the multiple protrusions E prevent the product WP from slipping under or climbing up the residual material WS, as well as horizontal movement. Also, when the intermediate product WR has a thin plate thickness, it may slip under or climb up the residual material WS due to deformation depending on the contour shape, but by forming the multiple protrusions E, this is prevented.

[0035] Next, the protrusion forming metal mold K56 will be described with reference to Figures 4A to 6D. The protrusion forming metal mold K56 is configured as a set of a protrusion forming die 5 and a protrusion forming punch 6. First, the protrusion forming die 5 will be described.

[0036] As shown in FIGS. 4A and 6A, the protrusion forming die 5 has a die body 51, a die receiving member 52, and a die ejector 53.

[0037] The die body 51 is cylindrical and detachably mounted on a die holder provided on the lower turret 121. The die body 51 has a protruding portion 512 protruding upward from the center of the upper surface 511 along the axis. The protruding portion 512 is formed in a stepped prism shape with a tip side thinner than the base side. The tip side portion of the protruding portion 512 is a tip portion 512a having a rectangular cross section. A push-up portion 512b protruding further upward in a prism shape is formed at a position closer to one side (right side) in the longitudinal direction (left-right direction) from the center of the upper surface of the tip portion 512a. The four side surfaces of the push-up portion 512b, the other side (left side) in the longitudinal direction and the front side adjacent thereto, are perpendicular to the horizontal upper surface of the tip portion 512a, and the other two side surfaces are inclined surfaces that diverge toward the end.

[0038] The tip portion 512a has a through hole 512c formed adjacent to the left side of the push-up portion 512b in the longitudinal direction, penetrating in the vertical direction. The die receiving member 52 is inserted and fixed inside the through hole 512c from below. At the upper end of the die receiving member 52, a coining portion 52a, which is a truncated pyramidal protrusion long in the longitudinal direction of the tip portion 512a, is formed as a first coining portion. The height position of the upper surface of the coining portion 52a is lower than the upper surface of the tip portion 512a. That is, the upper surface of the tip portion 512a is recessed as a through hole 512c in a rectangular range adjacent to the push-up portion 512b, and the coining portion 52a protrudes from the approximate center of the through hole 512c at a height lower than the upper surface of the tip portion 512a.

[0039] The die ejector 53 is an annular member and has a guide recess 531 that opens to the bottom surface, and a tip opening 532 that communicates with the guide recess 531 and opens to the top surface within a range that is included in the guide recess 531 when viewed from below. The tip portion 512a of the die body 51 enters and engages with the inside of the guide recess 531 and the tip opening 532 so as to be relatively movable up and down with a predetermined stroke. That is, the position shown in FIG. 6A is the uppermost position of the stroke of the die ejector 53 relative to the die body 51, and the position shown in FIG. 6D is the lowermost position of the stroke. In a natural state, the die ejector 53 is pushed up to the uppermost position by a biasing member (not shown).

[0040] 4A and 4B, the tip opening 532 opens in a rectangular shape that is long in the longitudinal direction (left-right direction) of the tip portion 512a in top view. A surrounding protrusion 53b that protrudes upward so as to surround the tip opening 532 is formed on the flat upper surface 53a of the die ejector 53. The surrounding protrusion 53b protrudes thinly in a frame shape at the edge of the long side on the rear side of the tip opening 532 and at the edges of a pair of short sides connected to both ends thereof, and protrudes thickly (over a wide range) forward at the edge of the long side on the front side.

[0041] Next, a description will be given of the protrusion-forming punch 6. As shown in Figures 5A, 5B, and 6A, the protrusion-forming punch 6 has a punch base 61, a punch body 62, a punch plate 63, a biasing member 64, a punch pressing member 65, and a punch receiving member 66.

[0042] The punch base 61 is formed in a cylindrical shape having a through hole 61a, and is detachably attached to a punch holder provided on the upper turret 122. In the punch base 61, a punch plate 63 is fixed to the lower part of the through hole 61a, and a punch pressing member 65 is fixed to the lower end of the punch base 61.

[0043] The punch plate 63 is a ring-shaped member and has a punch post insertion hole 63a that penetrates vertically at a position offset to the left from the center. The punch post insertion hole 63a has a rectangular cross-sectional shape. The punch plate 63 has a biasing member insertion hole 63b, to the right of the punch post insertion hole 63a, through which a biasing member 64 is inserted so as to be able to expand and contract.

[0044] The punch presser member 65 closes the lower end of the punch base 61, and a presser protrusion 651 is formed on the lower surface 65a thereof, protruding downward and having a rectangular cross-sectional shape with its longitudinal direction extending in the left-right direction. The base of the presser protrusion 651 forms an inclined surface that widens toward the end.

[0045] A guide hole 652 penetrating in the vertical direction is formed at a position slightly offset to one side (front side) in the short side direction in the center of the longitudinal direction of the pressing protrusion 651. As shown in Fig. 5B, the guide hole 652 is formed as a single hole in which a first guide hole 6521 and a second guide hole 6522, which are rectangular in bottom view, are connected to each other with a slight shift in the front-rear direction.

[0046] The punch body 62 is mounted so as to be movable up and down at a predetermined stroke within a through hole 61a of the punch base 61. Figures 6A to 6C show a state in which the punch body 62 is at the uppermost position of the predetermined stroke, and Figure 6D shows a state in which the punch body 62 is at the lowermost position of the predetermined stroke.

[0047] As shown in FIG. 6A, punch body 62 integrally includes a base portion 621, a punch post portion 622, a punch tip 623, and a tip end portion 624.

[0048] The base 621 is cylindrical and inserted into the through-hole 61a of the punch base to move up and down. The punch pillar 622 is a rectangular pillar-shaped part that extends downward from the lower surface of the base 621, with its axis being located at a position offset to the left from the center. The punch pillar 622 is inserted into the punch pillar insertion hole 63a of the punch plate 63 so as to be vertically movable.

[0049] Punch tip 623 is inserted into first guide hole 6521 of guide hole 652 of punch pressing member 65 so as to be movable up and down. The tip portion of punch tip 623 is a tapered tip tip portion 624 having an inclined surface 624b that inclines so as to approach the right side surface as it approaches the tip (lower end). As shown in Fig. 6A, tip surface 624a of tip tip portion 624 is at the same height as pressing lower surface 651a of pressing protrusion 651 of punch pressing member 65 at the upper end position of punch body 62 in a predetermined stroke of vertical movement.

[0050] 6A, punch receiving member 66 has a rectangular flat base 661 extending horizontally, and a square pillar-shaped receiving column portion 662 extending downward from base 661, and has an inverted L-shaped vertical cross section. Downward movement of punch receiving member 66 is restricted by the lower surface of base 661 abutting against step portion 65b of punch pressing member 65. A rib-shaped coining portion 66a extending downward with its longitudinal direction as a second coining portion is formed on the lower end surface of receiving column portion 662.

[0051] In this example, the biasing member 64 is a compression coil spring that compresses in the vertical direction. A cylindrical recess 621a is formed in the base 621 of the punch body 62, and the upper end of the biasing member 64 is inserted into the recess 621a to determine the upper end position relative to the punch body 62. The biasing member 64 has a vertical middle portion inserted into the biasing member insertion hole 63b of the punch plate 63 and a lower end abutting against the upper surface of the base 661 of the punch receiving member 66, so as to always bias the punch receiving member 66 downward. That is, the punch receiving member 66 is biased by the biasing member 64 to be at the lower end position relative to the punch pressing member 65 in the processing standby state shown in FIG. 6A. The punch receiving member 66 is then able to move upward by the application of an upward external force that resists the downward elastic repulsive force of the biasing member 64. In the standby state, the punch receiving member 66 is in a position where the coining portion 66a at the lower end portion projects downward from the pressing lower surface 651a of the pressing protrusion 651.

[0052] The above-mentioned relative vertical movement of the die ejector 53 in the protrusion forming die 5 with respect to the die body 51, and the relative vertical movement of the punch tip 623 and the punch receiving member 66 in the protrusion forming punch 6 with respect to the punch pressing member 65 are performed in a predetermined manner in conjunction with the relative vertical movement of the protrusion forming punch 6 with respect to the protrusion forming die 5. These relative vertical movements are performed by a die driving unit (not shown). The forming process of the protrusion E formed by the interlocking vertical movements of each member will be described with reference to FIGS. 6A to 6E, divided into a first forming process to a fourth forming process. The protrusion E is the one in part A in FIG. 2B (formed in the upper left), and the up, down, left, and right directions shown in FIGS. 6A to 6E correspond to the directions in FIG. 2B. The front is the front of the paper in FIG. 2B, and the rear is the back of the paper.

[0053] (First formation process: see FIG. 6A) 6A shows a state in which a workpiece W is supplied from the work table 11 to the punch processing unit 12 (see FIG. 1). The workpiece W is supplied between the protrusion forming die 5 and the protrusion forming punch 6, which are vertically separated, in a standby state. To be more specific, in the protrusion forming die 5, the die ejector 53 is at the uppermost position in the stroke of its vertical movement, and the protrusion 512 of the die body 51 inserted and disposed inside the tip opening 532 is at a recessed position within the tip opening 532.

[0054] (Second formation process: see FIG. 6B) Fig. 6B shows a state at the time when the protrusion forming punch 6 is lowered (see arrow DR1) by the control of the control device 2 and the pressing lower surface 651a of the pressing protrusion 651 abuts against the upper surface of the workpiece W. As shown in Fig. 6A, the punch receiving member 66, which protrudes downward in the natural state, abuts against the upper surface of the workpiece W before the pressing lower surface 651a, but since the downward force of the protrusion forming punch 6 is greater than the elastic repulsive force of the urging member 64, the urging member 64 is compressed and the punch pressing member 65 rises relative to the punch pressing member 65 (see arrow DR2).

[0055] (Third formation process: see FIG. 6C) When the protrusion forming punch 6 further descends (see arrow DR3), the workpiece W, which is pressed downward by the pressing lower surface 651a, presses the die ejector 53 downward. As a result, the die ejector 53 descends against the upward pushing force of the unillustrated urging member (see arrow DR4). Therefore, in the tip opening 532 of the die ejector 53, the protrusion 512 of the die body 51 rises relatively (see dashed arrow DR5). As a result, the boundary portion of the workpiece W is sheared by the relatively rising push-up portion 512b and the adjacent punch tip 623 descending, and the portion corresponding to the push-up portion 512b is pushed up by the push-up portion 512b, forming a second protrusion E2 protruding upward.

[0056] As the thrust-up portion 512b rises relative to the workpiece W, the punch receiving member 66 rises relatively to the workpiece W while vertically sandwiching the pushed-up portion of the workpiece W together with the thrust-up portion 512b. Then, when the protrusion forming punch 6 descends a predetermined first distance and the punch receiving member 66 rises relatively to the workpiece W by a predetermined distance, the base 661 of the punch receiving member 66 abuts against the lower surface of the punch plate 63, and the relative rise of the punch receiving member 66 is restricted. Therefore, the coining portion 66a at the lower end of the receiving pillar portion 662 of the punch receiving member 66 presses the flat plate portion E1a of the second protrusion E2 from above downward to form an indentation E2d, and the plastic flow of the member accompanying the formation of the indentation E2d causes a protrusion E2c (see FIG. 3C) to extend forward.

[0057] (Fourth formation process: see Fig. 6D and Fig. 6E) The protrusion forming punch 6 is lowered by a first distance, stopped, and maintained at that position. Next, the punch body 62 is lowered until its base 621 abuts against the punch plate 63 (see arrow DR6). With this downward movement of the punch body 62, the tip end 624 at the lower end pushes down a portion of the workpiece W corresponding to the tip end 624, forming a first protrusion E1 protruding downward. At this time, the coining portion 52a at the upper end of the die receiving member 52 presses upward the lower surface of the flat plate portion E1a of the first protrusion E1, forming an impression E1d, and a protrusion E1c (see FIG. 3C) is formed by the plastic flow of the member accompanying the formation of the impression E1d, extending forward.

[0058] As described above, according to the sheet metal processing method using the protrusion forming die K56, which is one embodiment of the sheet metal processing method and die for sheet metal processing of the present invention, the first protrusion E1 that prevents the product WP cut out from the workpiece W, which is sheet metal, from slipping into the remaining material WS, and the second protrusion E2 that prevents the product WP from climbing up onto the remaining material WS can be formed in one die processing as the protrusion E. Therefore, the number of times the protrusion E is processed can be reduced, and the processing time can be shortened.

[0059] Moreover, according to the sheet metal processing method using the protrusion forming die K56, the first protrusion E1 is formed with a protrusion E1c extending along the bottom surface of the product WP, and the second protrusion E2 is formed with a protrusion E2c extending along the top surface of the product WP. Therefore, the downward movement of the product WP is restricted by the protrusion E1c, and the upward movement is restricted by the protrusion E2c. Furthermore, the horizontal movement of the product WP (front-back, left-right) is restricted by the slit end surface WSt of the remainder WS. As a result, the product WP is held by the remainder WS without being separated from it unless an excessive external force is applied, and therefore it can be moved to another position together with the remainder WS at high speed by a transfer device such as a conveyor device 3.

[0060] The embodiment of the present invention is not limited to the above-mentioned configuration, and may be modified without departing from the spirit and scope of the present invention.

[0061] The above-mentioned protrusion forming mold K56 has a coining portion 52a that forms a protrusion E1c that supports the lower surface of the product WP by coining processing, and a coining portion 66a that forms a protrusion E2c that abuts the upper surface, but the protrusion forming mold K56 may be a mold that has only either the coining portion 52a, 66a, or a mold that has neither.

[0062] When the protrusion forming die K56 does not have both the coining portions 52a, 66a, neither the protrusion E1c nor the protrusion E2c is formed on the protrusion E. In this case, when the remnant material WS and the cut-out product WP are placed on the work table 11, the protrusion E prevents the product WP from slipping under or climbing over the remnant material WS.

[0063] When the protrusion forming die K56 has the coining portion 52a but does not have the coining portion 66a, only the protrusion E1c is formed on the protrusion E. In this case, the product WP is supported by the protrusion E1c abutting against the lower surface and is prevented from slipping under the residual material WS, but is not restricted from floating up. Therefore, it is possible to move the workpiece W including the residual material WS and the product WP horizontally with a small acceleration that does not cause the product WP to shift due to inertial force.

[0064] When the protrusion forming die K56 does not have the coining portion 52a but has the coining portion 66a, only the protrusion E2c is formed on the protrusion E. Therefore, the product WP is restricted from floating up. This prevents the remnant material WS or the product WP from climbing up onto the upper surface of the remnant material WS due to deformation such as warping or the application of an unexpected external force when the workpiece W including the remnant material WS and the product WP is placed on the work table 11.

[0065] Although the protrusion E has been described as being formed by forming the first protrusion E1 and the second protrusion E2 close to each other and shearing the boundary between the two parts, the first protrusion E1 and the second protrusion E2 may be formed at a certain distance apart and the two parts may be connected to each other by a connecting part formed by plastic deformation to form an integrated protrusion EA. This protrusion EA will be described with reference to FIG. 7.

[0066] Fig. 7 is a front view showing a protrusion EA which is a modified example of the protrusion E, and is a view comparable to the protrusion E shown in Fig. 3A. As shown in Fig. 7, the protrusion EA has a first protrusion EA1 and a second protrusion EA2. The distance in the left-right direction between the first protrusion EA1 and the second protrusion EA2 is larger than that between the first protrusion E1 and the second protrusion E2 in the protrusion E, and the right edge of the first protrusion EA1 and the left edge of the second protrusion EA2 are connected by a connecting portion EA3.

[0067] The first protruding portion EA1 has a flat portion EA1a, a sloped portion EA1b, a protrusion E1c, and an indentation EA1d, which correspond to the flat portion E1a, the sloped portion E1b, the protrusion E1c, and the indentation E1d, respectively, of the first protruding portion E1. The second protruding portion EA2 has a flat portion EA2a, a sloped portion EA2b, a protrusion E2c, and an indentation EA2d, which correspond to the flat portion E2a, the sloped portion E2b, the protrusion E2c, and the indentation E2d, respectively, of the second protruding portion E2.

[0068] In the protrusion forming die K56 for forming the first protrusion E1 and the second protrusion E2, the boundaries between the first protrusion E1 and the second protrusion E2 are sheared by eliminating gaps between the right side surface of the tip tip 624 and the left side surface of the punch receiving member 66, and between the right side surface of the tip portion of the die receiving member 52 and the left side surface of the tip portion 512a, and arranging them adjacent to each other. In contrast, when forming the first protrusion EA1 and the second protrusion EA2, gaps of a distance corresponding to the distance L7 (see FIG. 7) are provided between the right side surface of the tip tip 624 and the left side surface of the punch receiving member 66, and between the right side surface of the tip portion of the die receiving member 52 and the left side surface of the tip portion 512a.

[0069] By forming the protrusion EA having the connecting portion EA3, the shapes of the first protrusion EA1 and the second protrusion EA2 become more stable, and even if the protrusion EA is small, it can be formed with less deformation. This makes it possible to more stably restrict the movement of the product WP relative to the remnant material WS and hold the product WP by the remnant material WS.

[0070] As described in detail above, the sheet metal processing method which is a first embodiment of the present invention includes a cutting process in which the contour of the product WP to be cut out from the sheet metal W is cut leaving a portion to form slits Wm1, Wm2, and a product intermediate WR is formed with a portion connected to the remnant material WS; a protrusion forming process in which a protrusion E having a first protrusion E1 protruding downward and a second protrusion E2 protruding upward is formed at the edge of the slits Wm1, Wm2 in the remnant material WS; and a product separating process in which a portion is cut to cut out the product intermediate WR from the remnant material WS as the product WP.

[0071] Since the protrusion E has the first protrusion E1 and the second protrusion E2, the number of times the protrusion E is formed is reduced, and the processing time can be shortened.

[0072] In the first embodiment, the first protruding portion E1 and the second protruding portion E2 may be formed adjacent to each other by shearing the boundary portion.

[0073] This allows the area occupied by the protrusion E to be reduced, making it possible to apply the device to smaller products WP.

[0074] In the first embodiment, the first protrusion EA1 and the second protrusion EA2 may be connected by an inclined connecting portion EA3.

[0075] As a result, even if the protrusion EA is small, the shapes of the first protrusion EA1 and the second protrusion EA2 are not easily distorted, so that the product WP can be held more stably.

[0076] In addition, the first aspect may be such that, in the protrusion forming process, at least one of a protrusion E1c extending from the first protrusion E1 to penetrate into the underside of the product intermediate WR and a protrusion E2c extending from the second protrusion E2 to cover the upper surface of the product intermediate WR is formed.

[0077] This effectively prevents at least one of the intermediate product WR and the product WP from slipping under and climbing over the residual material WS.

[0078] In addition, in the first embodiment, in the protrusion forming process, a protrusion E1c extending from the first protrusion E1 so as to penetrate into the underside of the product intermediate WR is formed, and a protrusion E2c extending from the second protrusion E2 so as to cover the upper surface of the product intermediate WR is formed, and when the contour is rectangular, the protrusions E may be formed only on the edges of each of a pair of opposing slits Wm1, Wm2 of the contour.

[0079] This allows the product WP to be satisfactorily held by the waste material WS without forming protrusions E in the other pair of slits Wm3, Wm4 of the contour, and reduces the number of times that protrusions E are formed, thereby shortening the processing time.

[0080] A second embodiment of the sheet metal working die of the present invention includes a die 5 having a die ejector 53 and a tip portion 512a that moves up and down relatively to the die ejector 53, and a punch 6 having a punch holding member 65 and a punch receiving member 66 and a punch tip 623 that move up and down independently and relatively to the punch holding member 65, and arranged to move up and down above the die 5. The die ejector 53 supports from below a sheet metal workpiece W that is arranged between the die 5 and the punch 6 that are spaced apart from each other in the vertical direction, and moves the punch 6 to a first position. By lowering the punch 6 to its first position, the punch holding member 65 presses the workpiece W downward and the die ejector 53 lowers, while the tip portion 512a moves upward relatively, sandwiching a first range of the workpiece W between the punch receiving member 66 and the punch holding member 66 and pushing it upward to form an upward protrusion E2 that protrudes upward, and by moving the punch tip 623 downward relative to the punch holding member 65 while maintaining the punch 6 in the first position, a second range of the workpiece W is pushed downward to form a downward protrusion E1 that protrudes downward.

[0081] As a result, the protruding portion E having the first protruding portion E1 and the second protruding portion E2 can be formed in one molding operation, so that the number of times the protruding portion E is formed can be reduced, and the processing time can be shortened.

[0082] In the second embodiment, the punch receiving member 66 and the punch tip 623 may be arranged side by side in the first direction with no gap therebetween.

[0083] This allows the first protrusion E1 and the second protrusion E2 to be provided side by side, and allows the protrusion E to be formed small.

[0084] In addition, in a second embodiment, the metal mold may have at least one of a first coining portion 52a that coins the downward protrusion E1 when forming the downward protrusion E1 to form a protrusion E1c extending in a horizontal second direction perpendicular to the first direction, and a second coining portion 66a that coins the upward protrusion E2 when forming the upward protrusion E2 to form a protrusion E2c extending in the second direction.

[0085] This effectively prevents at least one of the intermediate product WR and the product WP from slipping under and climbing over the residual material WS. [Explanation of symbols]

[0086] 1 Multi-tasking machine 11 Work Table 12 Punch processing section 121 Lower Turret 122 Upper Turret 13 Laser Processing Section 131 Laser processing head 2. Control device 21 Control section 3. Conveyor 31 Arm 32 Adsorption part 321 Suction cup part 5. Protrusion forming die 51 Die Body 511 Top surface 512 Protrusion 512a Tip section 512b Push-up section 512c through hole 52 Die receiving member 52a Coining Department 53 Diejector 53a Top side 53b Surrounding protrusion 531 Guide recess 532 Tip opening 6. Protrusion forming punch 61 Punch Base 61a Through hole 62 Punch Body 621 Base 621a Recess 622 Punch column 623 Punch Tip 624 Tip end 624a Tip surface 624b Slope 63 Punch Plate 63a Punch post insertion hole 63b Urging member insertion hole 64 Pressing member 65 Punch holder 65a Bottom side 65b Stepped section 651 Presser protrusion 651a Lower surface of presser 652 Guide hole 6521 First guide hole 6522 2nd guide hole 66 Punch receiving member 66a Coining Department 661 Base 662 Support column 7. General Allocation Department (Computer) 71 Central Processing Unit (CPU) 711 Allocation section 72 Memory section 724 Mold data storage section 727 Product Information Storage Section 73 Input section 74 Output section E,EA protrusion E1,EA1 1st protrusion E1a, EA1a, flat plate part E1b,EA1b Inclined part E1c, EA1c protrusion E1d, EA1d indentation E2,EA2 2nd protrusion E2a, EA2a flat plate part E2b,EA2b Inclined part E2c,EA2c protrusion E2d,EA2d Indentation EA3 connection part KD Die Mold KP punch die K56 Protrusion forming mold LS Laser Beam L7 distance Ps boundary position SLt cutting section ST Sheet Metal Processing System Ta final cutting line Tb Final front cutting line W Work (sheet metal) Wm1~Wm4 Slit WP products WR product intermediates WS leftover material WSt Slit end face

Claims

1. a cutting process in which the outline of a product to be cut out from the sheet metal is cut to form a slit while leaving a portion thereof, and a product intermediate is formed by connecting the portion to the remaining material; a protrusion forming step of forming a protrusion having a first protrusion protruding downward and a second protrusion protruding upward on an edge of the slit in the remaining material; a product separation step of cutting the intermediate product from the remaining material as a product by cutting the part; The sheet metal processing method comprises:

2. The sheet metal working method according to claim 1 , wherein the first protruding portion and the second protruding portion are formed adjacent to each other by shearing a boundary portion.

3. The sheet metal working method according to claim 1 , wherein the first protrusion and the second protrusion are connected by an inclined connecting portion.

4. The sheet metal processing method according to any one of claims 1 to 3, wherein in the protrusion forming process, at least one of a protrusion extending from the first protrusion so as to penetrate into the underside of the intermediate product and a protrusion extending from the second protrusion so as to cover the upper surface of the intermediate product is formed.

5. The sheet metal processing method according to any one of claims 1 to 3, wherein in the protrusion forming process, a protrusion extending from the first protrusion so as to penetrate into the underside of the intermediate product is formed, and a protrusion extending from the second protrusion so as to cover the upper surface of the intermediate product is formed, and when the contour is rectangular, the protrusions are formed only on the edges of each of a pair of opposing slits in the contour.

6. a die having a die ejector and a tip portion which moves up and down relatively to the die ejector; and a punch having a punch holding member and a punch tip which moves up and down independently relative to the punch holding member, and which is disposed above the die so as to move up and down; The die ejector supports, from below, a sheet metal workpiece disposed between the die and the punch that are spaced apart from each other in the vertical direction; By lowering the punch to a first position, the punch pressing member presses the workpiece downward and the die ejector is lowered, while the tip portion moves upward relatively, and a first range of the workpiece is sandwiched between the punch receiving member and the punch pressing member, and pushed upward to form an upward protruding portion that protrudes upward; A sheet metal processing die configured to move the punch tip downward relative to the punch pressing member while maintaining the punch in the first position, thereby pushing a second range of the work downward and forming a downward protrusion that protrudes downward.

7. 7. The die for sheet metal working according to claim 6, wherein the punch receiving member and the punch tip are arranged side by side in the first direction with no gap therebetween.

8. 8. The die for sheet metal processing according to claim 7, further comprising at least one of a first coining portion that coins the downward protrusion when forming the downward protrusion to form a protrusion extending in a horizontal second direction perpendicular to the first direction, and a second coining portion that coins the upward protrusion when forming the upward protrusion to form a protrusion extending in the second direction.

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