A compound die for blanking and drawing

Abstract

A blanking and drawing combined die comprises a lower die and a movable upper die arranged above the lower die; wherein the lower die comprises a lower die seat, a female die, a male die and a drawing binder; and the upper die comprises an upper die seat, a female-male die, a blanking binder, a knockout rod, a pushing piece and an adjusting screw. In the process of drawing processing of the part by the blanking and drawing combined die, a gap with a constant width is formed between the lower surface of the female-male die and the upper surface of the first column body of the drawing binder, which limits the deformation space of the part in the drawing process, so that the part deformation is limited within the allowable range of the gap in the forming process. When the part deforms, the drawing binder is extruded, and the extrusion force is generated on the drawing binder. At the same time, the drawing binder generates a binder force with the same size and opposite direction on the part, so that the binder force changes synchronously with the deformation of the part, and the problem that the binder force cannot be self-adaptively adjusted in the existing drawing process is solved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of forming dies, in particular to a blanking and drawing compound die. BACKGROUND

[0002] The blanking and drawing processing is a process method for stamping a planar blank into a cup-shaped part through a die. During the process in which the part blank is changed from a flat plate into a cup-shaped part, the circumference of the part outer edge is greatly reduced. If the thickness direction of the part is not limited during the reduction process, the material in the part outer edge region will wrinkle due to instability, and finally the part processing cannot be continued. In order to avoid the part material from wrinkling due to instability, the current method is to apply a certain pre-pressure in the thickness direction of the part to limit the material from wrinkling. However, how to reasonably select the pre-pressure is a difficult problem, which is affected by many factors such as the material, geometric shape, surface state, lubrication effect of the planar blank, the geometric parameters, surface roughness of the die, the material drawing coefficient and the change of physical properties of the material due to cold work hardening during the drawing process. Most of the influencing factors are dynamically changing, so the reasonable blank holder force (i.e. the pre-pressure mentioned above) is also not a constant value during the drawing process. In terms of die structure, the blank holder force is generally provided by a spring or rubber. The blank holder force provided by the spring or rubber can only be changed in a small range, and cannot meet the requirement of self-adaptive adjustment of the blank holder force to a reasonable size during the drawing process. Whether the blank holder force is reasonably selected directly affects the quality of the drawn part. If the blank holder force is too large, the part bending part will be thinned, and if it exceeds the limit, the part cup-shaped bottom will crack. If the blank holder force is small, the part outer edge will remain wrinkled. SUMMARY

[0003] The technical problem to be solved by the application is to provide a blanking and drawing compound die with a blank holder force that can change synchronously with the deformation of the part, so as to realize self-adaptive adjustment of the blank holder force during the part drawing process.

[0004] To solve the above technical problems, the technical scheme adopted by the application is to provide a blanking and drawing compound die, which comprises a lower die and an upper die movably arranged above the lower die.

[0005] The lower die comprises a lower die seat, a concave die, a convex die and a drawing blank holder ring. The concave die has a hollow cylinder and a top wall connected to the upper end of the cylinder. The lower end of the cylinder is connected to the upper side of the lower die seat, and the top wall is provided with a first through hole and a second through hole. The lower end of the convex die is connected to the upper side of the lower die seat and located in the cylinder and aligned with the first through hole. The drawing blank holder ring is slidably sleeved on the outside of the convex die and elastically supported on the lower die seat at the lower end. The drawing blank holder ring comprises a first column and a second column connected to the lower end of the first column. The outer diameter of the second column is greater than that of the first column, and the outer diameter of the first column matches the inner diameter of the first through hole.

[0006] The upper die comprises an upper die seat, a concave-convex die, a blanking press ring, a material hitting rod, a pushing piece block and an adjusting screw; the concave-convex die is connected to the lower side of the upper die seat, the middle part of the concave-convex die has a cavity penetrating up and down and aligned with the male die, the inner diameter of the cavity is larger than the outer diameter of the male die, the lower part of the concave-convex die has a third cylinder with the same outer diameter as the first cylinder of the drawing press ring; the blanking press ring is slidingly sleeved on the outside of the third cylinder and elastically connected with the upper die seat, the blanking press ring is provided with a third through hole aligned with the second through hole; the pushing piece block is movably inserted into the cavity and the upper end is elastically connected with the upper die seat; the material hitting rod is movably inserted into the upper die seat, the lower end penetrates through the upper die seat and is connected to the pushing piece block; the upper end of the adjusting screw is threadedly connected with the upper die seat, the lower end extends into the cylinder from the second through hole and the third through hole and is aligned with the second cylinder.

[0007] When the upper die moves downward to make the lower end of the adjusting screw contact the second cylinder, there is a gap between the lower surface of the concave-convex die and the upper surface of the first cylinder of the drawing press ring.

[0008] By adopting the blanking and drawing compound die, the gap between the lower surface of the concave-convex die and the upper surface of the first cylinder of the drawing press ring well limits the deformation space of the part during the drawing process. In the initial stage of drawing, the degree of deformation of the part is within the allowable range of the gap, does not interact with the concave-convex die and the drawing press ring, and does not bear the anti-wrinkle pre-pressing force; in the forming process, the concave die moves downward, the part deformation produces a stacking trend, the gap width between the concave-convex die and the drawing press ring remains unchanged, so the gap can prevent the part from excessive stacking, the part deformation is limited within the allowable range of the gap, the part deformation extrudes the drawing press ring, and at the same time, according to the principle of action and reaction, the drawing press ring generates a blank holder force equal in size and opposite in direction to the part. As the drawing further proceeds, the material feeding and stacking trend intensifies, the extrusion force of the part on the drawing press ring increases, and the blank holder force of the drawing press ring acting on the part also increases. Thus, the blank holder force changes synchronously with the deformation of the part, solving the problem that the blank holder force cannot be self-adaptively adjusted in the existing drawing process.

[0009] In the blanking and drawing compound die, the lower die further comprises an elastic pad, the elastic pad is slidingly sleeved on the outside of the male die and the lower end is supported on the lower die seat, and the lower end of the second cylinder of the drawing press ring is supported on the elastic pad.

[0010] In the blanking and deep drawing composite mold provided by the present invention, the upper mold further includes a first connecting rod and a first spring. The first connecting rod is slidably inserted into the upper mold base, and the lower end of the first connecting rod passes through the upper mold base and is connected to the blanking pressure ring. The first spring is sleeved on the first connecting rod, and the upper and lower ends of the first spring elastically abut against the upper mold base and the blanking pressure ring, respectively.

[0011] In the blanking and deep drawing composite die provided by the present invention, the upper die base is provided with a first stepped hole that runs vertically through the upper and lower parts. The first stepped hole includes a first upper section hole with a larger inner diameter and a first lower section hole with a smaller inner diameter. The first connecting rod includes a rod portion and a head connected to the upper end of the rod portion. The rod portion is connected to the blanking pressure ring. The first upper section hole allows the rod portion and the head to pass through. The first lower section hole allows the rod portion to pass through but does not allow the head to pass through.

[0012] In the blanking and deep drawing composite die provided by the present invention, the upper die base is provided with a second stepped hole that runs vertically through the upper and lower parts. The second stepped hole includes a second upper section hole with a smaller inner diameter and a second lower section hole with a larger diameter. The punch and die include a fourth column connected to the upper end of the third column. The outer diameter of the fourth column is larger than the outer diameter of the third column. The inner diameter of the second lower section hole matches the outer diameter of the fourth column. The fourth column is inserted into the second lower section hole.

[0013] In the blanking and deep drawing composite die provided by this invention, the lower surface of the fourth column is flush with the lower surface of the upper die holder; the upper die further includes a first clamping ring sleeved on the outside of the third column and fixedly connected to the upper die holder, the upper surface of the first clamping ring respectively abutting the lower surfaces of the fourth column and the upper die holder. Thus, the punch and die are more securely mounted to the lower side of the upper die holder, ensuring the structural and performance stability of the blanking and deep drawing composite die.

[0014] In the blanking and deep drawing composite mold provided by the present invention, the first clamping ring is provided with a first clearance hole that runs vertically through it. The first clearance hole is aligned with the first stepped hole. The lower end of the first connecting rod passes through the first stepped hole and the first clearance hole from top to bottom. The upper end of the first spring is inserted into the first clearance hole.

[0015] In the blanking and deep drawing composite die provided by the present invention, the first clamping ring is provided with a second clearance hole that runs vertically through it, and the second clearance hole is aligned with the third through hole; the upper end of the adjusting screw passes through the second clearance hole and extends into the upper die holder and is threadedly connected to the upper die holder; the upper die also includes a clamping nut, the clamping nut is sleeved on the upper part of the adjusting screw and threadedly connected to the adjusting screw, and the upper surface of the clamping nut presses against the lower side of the first clamping ring.

[0016] In the blanking and deep drawing composite mold provided by the present invention, the upper mold further includes a second spring, the second spring is sleeved on the ejector rod, and the upper and lower ends of the second spring elastically abut against the upper mold base and the ejector block, respectively.

[0017] In the blanking and deep drawing composite die provided by this invention, the punch includes a base with a larger outer diameter and a stamping rod with a smaller outer diameter; the lower die also includes a second clamping ring sleeved on the outside of the punch and fixedly connected to the lower die base. The second clamping ring has a third stepped hole that extends vertically through the die. The third stepped hole includes a third upper section hole with a smaller inner diameter and a third lower section hole with a larger inner diameter. The base of the punch is received within the third lower section hole, and the stamping rod of the punch extends upward through the third upper section hole. The stepped surface connecting the third upper section hole and the third lower section hole is pressed against the upper surface of the base. The elastic pad is slidably sleeved on the outside of the stamping rod and supported on the upper surface of the second clamping ring. Thus, the punch is more securely installed on the lower die base, ensuring the structural and performance stability of the blanking and deep drawing composite die.

[0018] The blanking and deep drawing composite die provided by the invention can achieve at least the following beneficial effects: During the deep drawing process of the part, a gap with a constant width is formed between the lower surface of the die and the upper surface of the first column of the deep drawing blank holder, which restricts the deformation space of the part during the deep drawing process. Thus, during the forming process, the deformation of the part is limited within the allowable range of the gap. When the part deforms, it will squeeze the deep drawing blank holder and generate a squeezing force on the deep drawing blank holder. At the same time, the deep drawing blank holder will generate a blank holder force of equal magnitude and opposite direction on the part, thereby realizing that the blank holder force changes synchronously with the deformation of the part, and solving the problem that the blank holder force cannot be adaptively adjusted in the existing deep drawing process. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 A schematic diagram of the blanking and deep drawing composite die provided for the invention;

[0021] Figure 2 for Figure 1 First enlarged view of the area;

[0022] Figure 3 for Figure 1a second close-up view of the second portion of the first embodiment of the blanking and drawing composite die;

[0023] Figure 4 a bottom view of the upper die holder of the blanking and drawing composite die provided by the invention.

[0024] Explanation of reference numerals in the detailed description:

[0025] Lower die holder 11 Female die 12 Male die 13 Drawing press ring 14 Elastic pad 15 Second pressing ring 16 Chassis 131 Punch rod 132 Die handle 20 Upper die holder 21 Male-female die 22 Blanking press ring 23 Blanking rod 24 Pushing block 25 Adjusting screw rod 26 First pressing ring 27 Pressing nut 281 Gasket 282 First connecting rod 291 First spring 292 Second spring 293 First stepped hole 211 First upper section hole 2111 First lower section hole 2112 Rod portion 2912 Head portion 2911 First avoiding hole 271 Cavity 221 Gap 300 Second avoiding hole 272 First column 141 Second column 142 Third column 222 Fourth column 223 Second through hole 131 Third through hole 231 DETAILED DESCRIPTION

[0026] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in combination with the drawings in the specification and specific embodiments. It should be understood that the inventive embodiments and the specific features in the embodiments are detailed descriptions of the technical solutions of the present application, rather than limitations of the technical solutions of the present application. In the case of no conflict, the technical features in the inventive embodiments and the embodiments can be combined with each other.

[0027] The present embodiment provides a blanking and drawing composite die. Referring to Figures 1 to 3 , the blanking and drawing composite die comprises a lower die and an upper die movably arranged above the lower die.

[0028] In the embodiment, the lower die comprises a lower die seat 11, a female die 12, a male die 13 and a drawing binder 14; the female die 12 has a hollow cylinder and a top wall connected to the upper end of the cylinder, the lower end of the cylinder is connected to the upper side of the lower die seat 11, the top wall is provided with a first through hole and a second through hole 131; the male die 13 is connected to the upper side of the lower die seat 11 at the lower end and is located in the cylinder and aligned with the first through hole; the drawing binder 14 is slidably sleeved on the outside of the male die 13 and is elastically supported on the lower die seat 11 at the lower end, the drawing binder 14 comprises a first column 141 and a second column 142 connected to the lower end of the first column 141, the outer diameter of the second column 142 is larger than that of the first column 141, and the outer diameter of the first column 141 matches the inner diameter of the first through hole so that the first column 141 can be inserted into the first through hole. The upper die comprises an upper die seat 21, a concave-convex die 22, a blanking binder 23, a material knocking rod 24, a pushing piece 25 and an adjusting screw 26; the concave-convex die 22 is connected to the lower side of the upper die seat 21, the middle part of the concave-convex die 22 has a cavity 221 passing through the top and bottom and aligned with the male die 13, the inner diameter of the cavity 221 is larger than the outer diameter of the male die 13, and the lower part of the concave-convex die 22 has a third column 222 with the same outer diameter as the first column 141 of the drawing binder 14; the blanking binder 23 is slidably sleeved on the outside of the third column 222 and is elastically connected to the upper die seat 21, and the blanking binder 23 is provided with a third through hole 231 aligned with the second through hole 131; the pushing piece 25 is movably inserted into the cavity 221 and the upper end is elastically connected to the upper die seat 21; the material knocking rod 24 is movably inserted into the upper die seat 21, the lower end penetrates through the upper die seat 21 and is connected to the pushing piece 25; the upper end of the adjusting screw 26 is threadedly connected to the upper die seat 21, the lower end extends into the cylinder from the second through hole 131 and the third through hole 231 and is aligned with the second column 142; when the upper die moves downward to make the lower end of the adjusting screw 26 contact the second column 142, there is a gap 300 (see Figure 2 or Figure 3 ) between the lower surface of the concave-convex die 22 and the upper surface of the first column 141 of the drawing binder 14.

[0029] In the embodiment, the lower side of the upper die seat 21 is provided with a mounting hole (see Figure 4 ), the mounting hole is aligned with the second through hole 131, and the adjusting screw 26 is inserted into the mounting hole and is threadedly connected with the mounting hole.

[0030] In the embodiment, the upper surface of the male die 13 is higher than the upper surface of the top wall of the female die 12.

[0031] In the embodiment, the pushing piece 25 is connected with the ejector rod 24 by bolts, and the concave die 12 is connected with the lower die seat 11 by bolts.

[0032] In the embodiment, referring to Figure 2 , the upper die further comprises a first connecting rod 291 and a first spring 292. The first connecting rod 291 is slidingly inserted into the upper die seat 21, and the lower end of the first connecting rod 291 is connected with the blanking pad 23. The first spring 292 is sleeved on the first connecting rod 291, and the upper and lower ends of the first spring 292 are elastically abutted against the upper die seat 21 and the blanking pad 23, respectively. The upper die seat 21 is provided with a first stepped hole 211 penetrating through the upper die seat 21 from top to bottom. The first stepped hole 211 comprises a first upper segment hole 2111 with a larger inner diameter and a first lower segment hole 2112 with a smaller inner diameter. The first connecting rod 291 comprises a rod portion 2912 and a head portion 2911 connected with the upper end of the rod portion 2912. The rod portion 2912 is connected with the blanking pad 23. The first upper segment hole 2111 allows the rod portion 2912 and the head portion 2911 to pass through. The first lower segment hole 2112 allows the rod portion 2912 to pass through but does not allow the head portion 2911 to pass through. Specifically, the first connecting rod 291 is a screw rod, and the first connecting rod 291 is threadedly connected with the blanking pad 23. Through the above design, the elastic connection between the blanking pad 23 and the upper die seat 21 is achieved. As can be easily seen, when the upper die seat 21 moves downward, the blanking pad 23 can move downward synchronously. When the lower side of the blanking pad 23 is blocked, if the upper die seat 21 continues to move downward, the blanking pad 23 no longer moves downward and compresses the first spring 292, and the first stepped hole 211 on the upper die seat 21 moves downward relative to the first connecting rod 291.

[0033] In the embodiment, the upper die seat 21 is provided with a second stepped hole penetrating through the upper die seat 21 from top to bottom. The second stepped hole comprises a second upper segment hole with a smaller inner diameter and a second lower segment hole with a larger diameter. The concave-convex die 22 comprises a fourth columnar body 223 connected with the upper end of the third columnar body 222. The outer diameter of the fourth columnar body 223 is larger than the outer diameter of the third columnar body 222. The inner diameter of the second lower segment hole matches the outer diameter of the fourth columnar body 223, so that the fourth columnar body 223 can be inserted into the second lower segment hole. The fourth columnar body 223 is inserted into the second lower segment hole and is fixedly connected with the upper die seat 21 by bolts. Thus, the concave-convex die 22 can move upward and downward synchronously with the upper die seat 21.

[0034] In the embodiment, the upper die further comprises a second spring 293 sleeved on the material knocking rod 24, and upper and lower ends of the second spring 293 elastically abut against the upper die seat 21 and the pushing piece 25 respectively. The upper die further comprises a die handle 20 fixed on the upper side of the upper die seat 21 by bolts, and a fourth stepped hole penetrating through the die handle 20 in the up-down direction is arranged in the middle of the die handle 20, the fourth stepped hole is aligned with the second stepped hole, the fourth stepped hole has a fourth upper segment hole with a larger inner diameter and a fourth lower segment hole with a smaller inner diameter, the material knocking rod 24 has a clamping column with a larger outer diameter and a guide column with a smaller outer diameter, the outer diameter of the guide column matches the inner diameter of the fourth lower segment hole, the guide column is slidingly inserted into the fourth lower segment hole, and the clamping column is accommodated in the fourth upper segment hole, and the outer diameter of the clamping column is larger than the inner diameter of the fourth lower segment hole, that is, the fourth lower segment hole does not allow the clamping column to pass through. According to the above design, it should be understood that when the upper die seat 21 moves downward, the material knocking rod 24 and the pushing piece 25 can move downward synchronously, when the lower side of the pushing piece 25 is blocked, if the upper die seat 21 continues to move downward, the pushing piece 25 no longer moves downward and compresses the second spring 293, and the upper die seat 21 moves downward relative to the material knocking rod 24 and the pushing piece.

[0035] In the embodiment, the lower die further comprises an elastic pad 15 slidingly sleeved on the outside of the male die 13 and supported on the lower die seat 11 at the lower end, and the second column body 142 of the draw-pressing ring 14 is supported on the elastic pad 15 at the lower end.

[0036] In the embodiment, the upper die seat 21 has three first stepped holes 211 and three mounting holes, and correspondingly, the upper die comprises three first connecting rods 291, three first springs 292 and three adjusting screw rods. Among them, the three first stepped holes 211 and the three mounting holes are alternately arranged and distributed at six vertices of a regular hexagon (see Figure 4 ).

[0037] The process of blanking and drawing the blank by using the blanking and drawing compound die is as follows.

[0038] The upper die seat 21 is moved to an initial position in advance, at this time, it does not contact the lower die seat 11, and the blank is placed on the lower die seat 11; then the upper die seat 21 is driven to move downward, in the process of moving downward of the upper die seat 21, the pushing block, the concave-convex die 22 and the blanking and pressing ring 23 move downward with the upper die seat 21;

[0039] When the upper die holder 21 continues to move down, the blank holder ring 23 is compressed by the top wall of the female die 12, the second spring 293 exerts downward pressure on the blank holder ring 23, so that the blank holder ring 23 and the top wall of the female die 12 jointly clamp the edge portion of the blank;

[0040] When the upper die holder 21 continues to move down, the blank holder ring 23 is compressed by the top wall of the female die 12, the second spring 293 exerts downward pressure on the blank holder ring 23, so that the blank holder ring 23 and the top wall of the female die 12 jointly clamp the edge portion of the blank;

[0041] When the upper die holder 21 continues to move down, the blank holder ring 23 is compressed by the top wall of the female die 12, the second spring 293 exerts downward pressure on the blank holder ring 23, so that the blank holder ring 23 and the top wall of the female die 12 jointly clamp the edge portion of the blank;

[0042] When the upper die holder 21 continues to move down, the blank holder ring 23 is compressed by the top wall of the female die 12, the second spring 293 exerts downward pressure on the blank holder ring 23, so that the blank holder ring 23 and the top wall of the female die 12 jointly clamp the edge portion of the blank;

[0043] It should be noted that since the upper end of the adjusting screw 26 is threadedly connected with the mounting hole, the height of the lower end surface of the adjusting screw can be adjusted by screwing the adjusting screw, so that the width of the gap 300 between the upper surface of the first column 141 of the drawbead ring 14 and the lower surface of the concave-convex die 22 can be adjusted to a proper value as required.

[0044] When the drawing process is completed, the blank after drawing can be ejected from the concave-convex die 22 by pushing the pushing piece 25 by the ejector rod 24.

[0045] Further, referring to Figure 2 and 3 , the lower surface of the fourth column 223 is flush with the lower surface of the upper die holder 21; the upper die further comprises a first pressing ring 27 which is sleeved on the outer side of the third column 222 and fixedly connected with the upper die holder 21, and the upper surface of the first pressing ring 27 supports the lower surfaces of the fourth column 223 and the upper die holder 21, respectively. In this way, the concave-convex die 22 is more stably mounted to the lower side of the upper die holder 21, ensuring the stability of the structure and performance of the blanking and drawing compound die. The first pressing ring 27 is provided with a first avoiding hole 271 which penetrates the first pressing ring 271 from top to bottom, the first avoiding hole 271 is aligned with the first stepped hole 211, and the lower end of the first connecting rod 291 passes through the first stepped hole 211 and the first avoiding hole 271 from top to bottom in sequence; the upper end of the first spring 292 is inserted into the first avoiding hole 271. The first pressing ring 27 is provided with a second avoiding hole 272 which penetrates the first pressing ring 271 from top to bottom, the second avoiding hole 272 is aligned with the third through hole 231; the upper end of the adjusting screw 26 passes through the second avoiding hole 272 and extends into the upper die holder 21 and is threadedly connected with the upper die holder 21; the upper die further comprises a pressing nut 281 which is sleeved on the upper part of the adjusting screw 26 and threadedly connected with the adjusting screw 26, and the upper surface of the pressing nut 281 abuts against the lower side of the first pressing ring 27. A gasket 282 is further arranged between the pressing nut 281 and the first pressing ring 27.

[0046] Further, the punch 13 comprises a base plate 131 with a large outer diameter and a stamping rod 132 with a small outer diameter; the lower die further comprises a second compression ring 16 sleeved outside the punch 13 and fixedly connected with the lower die seat 11, the second compression ring 16 is provided with a third stepped hole penetrating up and down, the third stepped hole comprises a third upper segment hole with a small inner diameter and a third lower segment hole with a large inner diameter, the base plate 131 of the punch 13 is accommodated in the third lower segment hole, and the stamping rod 132 of the punch 13 penetrates out of the third upper segment hole upward; the stepped surface connecting the third upper segment hole and the third lower segment hole is compressed on the upper surface of the base plate 131; and the elastic pad 15 is sleeved outside the stamping rod 132 and supported on the upper surface of the second compression ring 16. Specifically, the second compression ring 16 is fixedly connected with the lower die seat 11 through bolts, and the punch 13 is fixedly connected with the lower die seat 11 through bolts. In this way, the punch 13 is fixed with the lower die seat 11 directly on one hand and compressed on the lower die seat 11 by the second compression ring 16 on the other hand, so as to be more stably installed on the lower die seat 11, ensuring the stability of the structure and performance of the blanking and drawing compound die. Here, it should be pointed out that the above-mentioned cavity 221 of the concave-convex die 22 has an inner diameter larger than the outer diameter of the punch 13, and specifically, the outer diameter of the cavity 221 is designed to be slightly larger than the outer diameter of the stamping rod 132 of the punch 13.

[0047] In summary, in the blanking and drawing compound die provided by the embodiment, when the lower end of the adjusting screw rod 26 abuts against the upper surface of the second columnar body 142 of the drawing binder 14, the gap 300 between the lower surface of the concave-convex die 22 and the upper surface of the first columnar body 141 of the drawing binder 14 well limits the deformation space of the part during the drawing process. In the initial stage of drawing, the degree of deformation of the part is within the allowable range of the gap 300, and does not interact with the concave-convex die 22 and the drawing binder 14, and does not bear the anti-wrinkle pre-pressing force; in the forming process, the concave die 12 moves downward, the part deformation has a stacking trend, the gap 300 between the concave-convex die 22 and the drawing binder 14 remains unchanged, so the gap 300 can prevent the part from excessive stacking, and the part deformation is limited within the allowable range of the gap 300, and the part deformation extrudes the drawing binder 14, and at the same time, according to the principle of action and reaction, the drawing binder 14 generates a blank holder force equal in size and opposite in direction to the extrusion force of the part. With the further proceeding of drawing, the material feeding and stacking trend intensifies, the extrusion force of the part on the drawing binder 14 increases, and the blank holder force of the drawing binder 14 on the part also increases. Thus, the blank holder force changes synchronously with the deformation of the part, solving the problem that the blank holder force cannot be self-adaptively adjusted in the existing drawing process.

[0048] In the description of the application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the referred structure or unit must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In addition, the features defined as "first" and "second" can be explicitly or implicitly included one or more of the features. In the description of the application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0049] In the description of the application, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application. In this specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0050] The embodiments of the application are described above in combination with the drawings, but the application is not limited to the specific embodiments described above, and the specific embodiments described above are only illustrative, not limiting, and those skilled in the art can make many forms under the inspiration of the application without departing from the purpose of the application and the scope protected by the claims, which are all within the protection of the application.

Claims

1. A compound die for blanking and drawing, characterized by comprising: The lower die comprises a lower die seat (11), a female die (12), a male die (13) and a drawing binder (14); the female die (12) has a hollow cylinder and a top wall connected to the upper end of the cylinder, the lower end of the cylinder is connected to the upper side of the lower die seat (11), and the top wall is provided with a first through hole and a second through hole; the male die (13) is connected to the upper side of the lower die seat (11) and located in the cylinder and aligned with the first through hole; the drawing binder (14) is slidably sleeved on the outside of the male die (13) and elastically supported on the lower die seat (11) at the lower end, and the drawing binder (14) comprises a first column (141) and a second column (142) connected to the lower end of the first column (141), the outer diameter of the second column (142) is larger than that of the first column (141), and the outer diameter of the first column (141) matches the inner diameter of the first through hole; The upper die comprises an upper die seat (21), a concave-convex die (22), a blanking binder (23), a material knocking rod (24), a pushing piece (25) and an adjusting screw (26); the concave-convex die (22) is connected to the lower side of the upper die seat (21), the middle part of the concave-convex die (22) has a cavity (221) passing through the upper and lower sides and aligned with the male die (13), the inner diameter of the cavity (221) is larger than the outer diameter of the male die (13), and the lower part of the concave-convex die (22) has a third column (222) with the same outer diameter as the first column (141) of the drawing binder (14); the blanking binder (23) is slidably sleeved on the outside of the third column (222) and elastically connected to the upper die seat (21), and the blanking binder (23) is provided with a third through hole (231) aligned with the second through hole; the pushing piece (25) is movably inserted into the cavity (221) and elastically connected to the upper die seat (21) at the upper end; the material knocking rod (24) is movably inserted into the upper die seat (21), the lower end of the material knocking rod (24) penetrates through the upper die seat (21) and is connected to the pushing piece (25); the upper end of the adjusting screw (26) is threadedly connected to the upper die seat (21), and the lower end of the adjusting screw (26) extends into the cylinder from the second through hole and the third through hole (231) and is aligned with the second column (142); When the upper die moves downward to make the lower end of the adjusting screw (26) contact the second column (142), a gap (300) with a constant width is formed between the lower surface of the concave-convex die (22) and the upper surface of the first column (141) of the drawing binder (14). ​ In the initial stage of drawing, the part deformation is within the allowable range of the gap (300), and does not interact with the concave-convex die (22) and the drawing binder (14), and does not bear the anti-wrinkle pre-pressing force; in the forming process, the concave die (12) moves downward, the part deformation produces stacking tendency, the gap (300) between the concave-convex die (22) and the drawing binder (14) remains unchanged, the gap (300) can prevent the part from excessive stacking, the part deformation is limited within the allowable range of the gap (300), the part deformation extrudes the drawing binder (14), at the same time of generating extrusion force on the drawing binder (14), according to the principle of action and reaction, the drawing binder (14) will generate a blank holder force on the part, which is equal in size and opposite in direction, with the further drawing, the material feeding and stacking tendency intensify, the extrusion force of the part on the drawing binder (14) increases, and the blank holder force of the drawing binder (14) on the part also increases, so that the blank holder force changes synchronously with the part deformation; The lower die further comprises an elastic pad (15) which is slidably sleeved on the outer side of the male die (13) and supported at the lower end on the lower die seat (11), and the second column body (142) of the drawing binder (14) is supported at the lower end on the elastic pad (15); the upper die further comprises a first connecting rod (291) and a first spring (292), the first connecting rod (291) is slidably inserted into the upper die seat (21), the lower end of the first connecting rod (291) penetrates out of the upper die seat (21) and is connected with the blanking binder (23); the first spring (292) is sleeved on the first connecting rod (291), and the upper and lower ends of the first spring (292) are elastically abutted on the upper die seat (21) and the blanking binder (23) respectively.

2. The compound die of claim 1, wherein The upper die seat (21) is provided with a first stepped hole (211) penetrating through up and down, the first stepped hole (211) comprises a first upper segment hole (2111) with a larger inner diameter and a first lower segment hole (2112) with a smaller inner diameter; the first connecting rod (291) comprises a rod portion (2912) and a head portion (2911) connected to the upper end of the rod portion (2912), and the rod portion (2912) is connected with the blanking binder (23); the first upper segment hole (2111) allows the rod portion (2912) and the head portion (2911) to penetrate; the first lower segment hole (2112) allows the rod portion (2912) to penetrate and does not allow the head portion (2911) to penetrate.

3. The blanking and drawing compound die according to claim 2, characterized in that, The upper die seat (21) is provided with a second stepped hole penetrating through up and down, the second stepped hole comprises a second upper segment hole with a smaller inner diameter and a second lower segment hole with a larger diameter; the concave-convex die (22) comprises a fourth column body (223) connected to the upper end of the third column body (222), the outer diameter of the fourth column body (223) is larger than that of the third column body (222), the inner diameter of the second lower segment hole matches the outer diameter of the fourth column body (223), and the fourth column body (223) is inserted into the second lower segment hole.

4. The blanking and drawing compound die according to claim 3, characterized in that, The lower surface of the fourth column (223) is flush with the lower surface of the upper die seat (21); the upper die further comprises a first compression ring (27) sleeved on the outer side of the third column (222) and fixedly connected with the upper die seat (21), and the upper surface of the first compression ring (27) supports the lower surfaces of the fourth column (223) and the upper die seat (21) respectively.

5. The blanking and drawing compound die according to claim 4, characterized in that, The first compression ring (27) is provided with a first avoiding hole (271) penetrating from top to bottom, the first avoiding hole (271) is aligned with the first stepped hole (211), and the lower end of the first connecting rod (291) passes through the first stepped hole (211) and the first avoiding hole (271) from top to bottom in sequence; and the upper end of the first spring (292) is inserted into the first avoiding hole (271).

6. The blanking and drawing compound die according to claim 4, wherein The first compression ring (27) is provided with a second avoiding hole (272) penetrating from top to bottom, the second avoiding hole (272) is aligned with the third through hole (231); the upper end of the adjusting screw rod (26) extends into the upper die seat (21) and is threadedly connected with the upper die seat (21) after passing through the second avoiding hole (272); and the upper die further comprises a compression nut (281) sleeved on the upper part of the adjusting screw rod (26) and threadedly connected with the adjusting screw rod (26), and the upper surface of the compression nut (281) tightly supports the lower side of the first compression ring (27).

7. The compound die of claim 1, wherein The upper die further comprises a second spring (293) sleeved on the material knocking rod (24), and the upper and lower ends of the second spring (293) elastically abut against the upper die seat (21) and the pushing piece block (25) respectively.

8. The compound die of claim 1, wherein The male die (13) comprises a bottom disc (131) with a large outer diameter and a stamping rod (132) with a small outer diameter; the lower die further comprises a second compression ring (16) sleeved on the outer side of the male die (13) and fixedly connected with the lower die seat (11), and the second compression ring (16) is provided with a third stepped hole penetrating from top to bottom, the third stepped hole comprises a third upper segment hole with a small inner diameter and a third lower segment hole with a large inner diameter, the bottom disc (131) of the male die (13) is accommodated in the third lower segment hole, and the stamping rod (132) of the male die (13) passes out of the third upper segment hole upward; the stepped surface connecting the third upper segment hole and the third lower segment hole is compressed on the upper surface of the bottom disc (131); and the elastic pad (15) is sleeved on the outer side of the stamping rod (132) and supported on the upper surface of the second compression ring (16).

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