Adjustable springback stamping die for n-shaped bent part

Abstract

The adjustable springback stamping die comprises an upper die, a lower die and a negative angle shaping part, the negative angle shaping part comprises an upper shaping male, a lower shaping male and a reverse push block, a containing groove is formed in the upper die, the upper shaping male is rotationally connected with the upper die and can stretch out of an inner cavity of the containing groove, and the lower shaping male is rotationally connected with the lower die and can stretch out of an inner cavity of the reverse push block. The lower shaping male part and the reverse push block are detachably connected with the lower die, the lower shaping male part is provided with an inclined side face with the inclination angle being the sum of the inclination angle of a workpiece and the estimated rebound angle, the end face, close to one side of the inclined side face, of the reverse push block is a first inclined face, and the first inclined face is parallel to the inclined side face. According to the scheme, negative angle shaping is carried out on the workpiece through the negative angle shaping part, the space proportion of the negative angle shaping part in the die can be reduced, the negative angle shaping part can be freely added in a multi-station continuous die, and the die cost is effectively reduced. And according to bending springback angles under different conditions, the lower shaping male and the reverse pushing block with different angles can be replaced, the angle of the negative angle of the workpiece is pushed and adjusted, and convenience and rapidness are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of stamping dies, in particular to an adjustable rebound stamping die for an "X"-shaped bending part. Background Art

[0002] When metal stamping materials undergo elastic deformation, they will rebound after releasing the external force due to uneven internal stress. In the stamping process, many factors such as different sheet materials, different bending radius sizes, and large or small bending gaps will cause different degrees of rebound. The rebound phenomenon is unavoidable. When engineers lack design experience, they are often troubled by this aspect, which in turn affects the progress of related mold manufacturing.

[0003] In response to bending springback, compensatory measures are often taken in the stamping process, that is, adding a shaping process (negative angle shaping). Negative angle shaping is usually set in the rear step of the forming station to offset the impact of bending springback. Currently, most of the existing stamping die bending shaping uses an inclined wedge side push shaping mechanism, which includes an upper inclined wedge, a lower inclined wedge and a lower inclined wedge reset spring assembly. The layout of the inclined wedge mechanism occupies a large mold space and is more cumbersome to use in continuous molds. In particular, the main forming process requires several "U"-shaped 90-degree bends of "J"-shaped hardware. When multiple sets of shaping steps need to be designed on the forming material strip, the stamping die size of the "J"-shaped bending part needs to be further increased. Utility Model Content

[0004] In order to solve the problem that when performing negative angle shaping in the above-mentioned prior art solutions, an inclined wedge side-push shaping mechanism occupies a large mold space, resulting in an increase in mold size, the utility model provides an adjustable rebound stamping mold for an "X"-shaped bending part, which occupies a small space, has simple operation and quick debugging.

[0005] The technical scheme adopted by the utility model is: an adjustable rebound stamping die for a "J"-shaped bending part, comprising an upper die, a lower die and a negative angle shaping part, the negative angle shaping part comprising an upper shaping male, a lower shaping male and a reverse push block, an accommodating groove is provided on the upper die, one end of the upper shaping male is located in the accommodating groove and is rotatably connected to the upper die, the other end of the upper shaping male can be extended from the inner cavity of the accommodating groove, the lower shaping male and the reverse push block are both detachably connected to the lower die, the side surface of the lower shaping male used for negative angle shaping of the workpiece is an inclined side surface, the inclination angle of the inclined side surface is the sum of the inclination angle of the workpiece and the estimated rebound angle, the end surface of the reverse push block close to the inclined side surface is a first inclined surface, the first inclined surface is parallel to the inclined side surface, and when the upper shaping male is inserted into the gap between the reverse push block and the lower shaping male, the upper shaping male fits with the reverse push block.

[0006] In the initial state, the upper die and the lower die are separated. At this time, the upper shaping rod naturally droops in the receiving groove due to its own gravity and is in a vertical state. When the bending part is shaped, the upper die descends until it abuts against the lower die, and then the upper die continues to descend, causing the upper shaping rod to continue to descend, and one end of the upper shaping rod extends from the receiving groove and extends into the gap between the reverse push block and the lower shaping rod. When the upper shaping rod extends into the gap between the reverse push block and the lower shaping rod, since the first inclined surface is parallel to the inclined side surface, the shaping rod on the reverse push block will rotate in the receiving groove during the downward process so that the side surface of the upper shaping rod fits with the first inclined surface. When the upper shaping rod extends into the gap between the reverse push block and the lower shaping rod, the upper shaping rod will squeeze the material strip so that the material strip fits with the inclined side surface on the lower shaping rod. At this time, the upper shaping rod pushes the workpiece into a negative angle state, realizing the negative angle shaping operation of the workpiece.

[0007] This solution uses the negative angle shaping part to shape the workpiece negatively, which can reduce the space occupied by the negative angle shaping part in the mold. It can be freely added in the multi-station continuous mold, effectively reducing the mold cost. And according to the bending springback angle in different conditions, the lower shaping male and reverse push block of different angles can be replaced to push and adjust the negative angle of the workpiece, which is convenient and quick.

[0008] Preferably, a first chamfer is provided on one end of the upper shaping male that can extend from the receiving groove, and a second inclined surface is also provided on the reverse push block. The second inclined surface is located at one end of the first inclined surface close to the upper mold, and the side of the second inclined surface close to the upper mold is inclined in a direction away from the lower shaping male, and the first chamfer is parallel to the second inclined surface. When the upper shaping male extends into the gap between the lower shaping male and the reverse push block, the first chamfer and the second inclined surface can guide the upper shaping male, making it easier for the upper shaping male to rotate in the receiving groove and smoothly enter the gap between the lower shaping male and the reverse push block. In addition, the first chamfer can also facilitate the extrusion of the material strip to fit with the lower shaping male.

[0009] Preferably, it also includes a first bending part for realizing w-forming of the material strip and a second bending part for realizing u-forming of the material strip. The first bending part, the second bending part and the negative angle shaping part are arranged in sequence. The first bending part includes a w upper shaping male connected to the upper die and a w lower shaping male connected to the lower die; the second bending part includes a u upper shaping male connected to the upper die and a u lower shaping male connected to the lower die. When the material strip is stamped, the material strip is first stamped into a w shape, and then the w-shaped material strip is stamped into a u-shaped material strip. Finally, the u-shaped material strip is negatively shaped, so that the u-shaped bending surface of the material strip enters a negative angle state, giving the material strip space to rebound. When the "J"-shaped workpiece is stamped, the one-time bending forming process of the material strip is modified to first perform a w-shaped bending and then a u-shaped bending, and the material strip is processed in steps, so that the angle of each bending of the material strip becomes smaller, which can reduce the accumulation of internal stress of the material caused by large-angle processing and forming, and thus reduce the probability and degree of quality defects of the material strip.

[0010] Preferably, the angle between the inclined plane on the lower forming rod for forming the side of the workpiece and the horizontal plane is 25°-40°. Experiments have shown that when the material strip is W-formed, when the angle between the inclined plane on the side of the workpiece and the horizontal plane is 25°-40°, the stress accumulation in the material can be minimized during the bending process of the workpiece.

[0011] Preferably, the upper die includes an upper die seat, an upper pad, an upper fixed plate, and a unloading pad and unloading plate fixedly connected in sequence, one end of the elastic member passes through the upper fixed plate and the upper pad to be connected to the upper die seat, and the other end is connected to the unloading pad, the accommodating groove passes through the upper fixed plate, the unloading pad and the unloading plate, the upper shaping male is rotatably connected to the upper fixed plate, the w upper forming male and the u upper forming male are both fixedly connected to the upper fixed plate and can both pass through the unloading pad and the unloading plate, the lower die includes a concave template, a lower template and a lower die seat fixedly connected in sequence, the w lower forming male and the u lower forming male are both fixedly connected to the concave template, and the lower shaping male and the reverse push block are detachably connected to the concave template. When the driving unit drives the upper die downward, the stripper plate first contacts the concave die plate of the lower die, and then the driving unit continues to drive the upper die downward. At this time, the elastic member is compressed, and the stripper plate and the stripper pad remain relatively stationary with the lower die. The upper die seat, the upper pad and the upper fixed plate continue to approach the concave die plate, and the w upper forming male, u upper forming male and upper shaping male on the upper fixed plate extend from the upper die to perform stamping and bending on the material strip on the concave die plate. After the stamping is completed, the driving unit drives the upper die upward. First, the elastic member recovers its deformation, and the upper die seat, the upper pad and the upper fixed plate move away from the concave die plate. When the elastic member is reset, the w upper forming male, u upper forming male and upper shaping male retract into the upper die again. The driving unit continues to drive the upper die upward, and the stripper plate and the stripper pad move away from the concave die plate until they are reset, and the die returns to its initial state.

[0012] Preferably, a guide sleeve is provided at one end of the unloading plate close to the concave mold plate, and a guide sleeve hole is provided at one end of the concave mold plate close to the unloading plate, and the guide sleeve can be inserted into the inner cavity of the guide sleeve hole and fit tightly into the guide sleeve hole. The end of the guide sleeve away from the unloading plate and the end of the guide sleeve hole close to the unloading plate are both chamfered. When the upper mold and the lower mold are closed, the guide sleeve first enters the guide sleeve hole and guides the descending upper mold. The setting of the chamfer makes it easier for the guide sleeve to smoothly extend into the guide sleeve hole.

[0013] Preferably, the concave mold plate is also provided with a floating pin for lifting the material strip, the floating pin is fixedly connected to the concave mold plate, and the floating pin is provided with a slot for engaging the material strip. The setting of the floating pin can lift the material strip, making it easier for the upper mold to punch the material strip.

[0014] Preferably, a material feeding slope is provided on one end of the concave mold plate for discharging the material, and the end of the material feeding slope away from the negative angle shaping portion is tilted downward in the vertical direction for the workpiece to flip and fall. When the formed workpiece is pushed onto the material feeding slope by the material strip, the workpiece will fall from the lower mold along the material feeding slope into a designated collection device, and the material feeding slope plays a guiding role for the workpiece to fall.

[0015] Preferably, bolts are provided on the lower shaping male and the reverse push block, and the bolts are threadedly connected with the concave template. The threaded connection has high connection strength and is easy to disassemble.

[0016] Compared with the prior art, the utility model has the following beneficial effects: the negative angle shaping part is used to shape the workpiece negatively, which can reduce the space occupied by the negative angle shaping part in the mold, and can be freely added in the multi-station continuous mold, effectively reducing the mold cost. In addition, according to the bending rebound angle in different conditions, the lower shaping male and reverse push block of different angles can be replaced to push and adjust the negative angle of the workpiece, which is convenient and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the internal structure of an adjustable rebound stamping die for a "X"-shaped bending part of the utility model;

[0018] Figure 2 It is a structural diagram of a negative angle shaping part, a first bending part and a second bending part of an adjustable rebound stamping die of a "X"-shaped bending part of the utility model;

[0019] Figure 3 It is a structural schematic diagram of an adjustable rebound stamping die for a "X"-shaped bending part of the utility model;

[0020] Figure 4 It is a schematic diagram of the internal structure of an adjustable rebound stamping die for a "X"-shaped bending part of the utility model when the die is closed;

[0021] Figure 5 It is a schematic diagram of the internal structure of an adjustable rebound stamping die for a "X"-shaped bending part during stamping of the utility model;

[0022] Figure 6 The utility model is a structural schematic diagram of a second bending part of an adjustable rebound stamping die of a "X"-shaped bending part. DETAILED DESCRIPTION

[0023] The drawings are only for illustrative purposes and cannot be construed as limiting the present invention. To better illustrate the present embodiment, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The positional relationships described in the drawings are only for illustrative purposes and cannot be construed as limiting the present invention.

[0024] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "long", "short" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0025] The technical solution of the utility model is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0026] Example 1

[0027] like Figure 1-Figure 2 The figure shows an embodiment 1 of an adjustable rebound stamping die for a "J"-shaped bending part, comprising an upper die, a lower die and a negative angle shaping part, the negative angle shaping part comprising an upper shaping male 1, a lower shaping male 2 and a reverse push block 3, the upper die is provided with a receiving groove 4, one end of the upper shaping male 1 is located in the receiving groove 4 and is rotatably connected to the upper die, the other end of the upper shaping male 1 can extend from the inner cavity of the receiving groove 4, the lower shaping male 2 and the reverse push block 3 are both detachably connected to the lower die, the side surface of the lower shaping male 2 used for negative angle shaping of the workpiece is an inclined side surface 201, the inclination angle of the inclined side surface 201 is the sum of the inclination angle of the workpiece and the estimated rebound angle, the end surface of the reverse push block 3 close to the inclined plane is a first inclined surface 301, the first inclined surface 301 is parallel to the inclined side surface 201, when the upper shaping male 1 is inserted into the gap between the reverse push block 3 and the lower shaping male 2, the upper shaping male 1 fits with the reverse push block 3.

[0028] The working principle or working process of this embodiment: in the initial state, the upper mold and the lower mold are separated, and at this time, the upper shaping male 1 naturally droops in the receiving groove 4 due to its own gravity and is in a vertical state. When the bending part is shaped, the upper mold descends until it abuts against the lower mold, and then the upper mold continues to descend, so that the upper shaping male 1 continues to descend, and one end of the upper shaping male 1 extends from the receiving groove 4 and extends into the gap between the reverse push block 3 and the lower shaping male 2. When the upper shaping male 1 extends into the gap between the reverse push block 3 and the lower shaping male 2, since the first inclined surface 301 is parallel to the inclined side surface 201, the upper shaping male 1 of the reverse push block 3 will rotate in the receiving groove 4 during the downward process so that the side surface of the upper shaping male 1 fits with the first inclined surface 301. When the upper shaping male 1 extends into the gap between the reverse push block 3 and the lower shaping male 2, the upper shaping male 1 will squeeze the material strip so that the material strip fits with the inclined side surface 201 on the lower shaping male 2. At this time, the upper shaping male 1 pushes the workpiece into a negative angle state, thereby realizing the negative angle shaping operation of the workpiece.

[0029] Beneficial effects of this embodiment: This solution uses the negative angle shaping part to shape the workpiece at a negative angle, which can reduce the space occupied by the negative angle shaping part in the mold, and can be freely added in a multi-station continuous mold, effectively reducing the mold cost. In addition, according to the bending rebound angle in different conditions, the lower shaping male 2 and the reverse push block 3 of different angles can be replaced to push and adjust the negative angle of the workpiece, which is convenient and quick.

[0030] Example 2

[0031] Embodiment 2 of an adjustable rebound stamping die for a "J"-shaped bending part, as shown in Figure 1 , Figure 2 and Figure 6 As shown, based on Example 1, the forming process of the workpiece is further limited.

[0032] Specifically, Figure 1 and Figure 2 As shown, a first chamfer is provided on one end of the upper shaping male 1 that can extend from the accommodating groove 4, and a second inclined surface 302 is also provided on the reverse push block 3. The second inclined surface 302 is located on an end of the first inclined surface 301 close to the upper mold, and one side of the second inclined surface 302 close to the upper mold is inclined in a direction away from the lower shaping male 2, and the first chamfer can be parallel to the second inclined surface 302.

[0033] Specifically, Figure 2 and Figure 6 As shown, it also includes a first bending portion for realizing w-forming of the material strip and a second bending portion for realizing u-forming of the material strip. The first bending portion, the second bending portion and the negative angle shaping portion are arranged in sequence. The first bending portion includes a w upper forming male 5 connected to the upper die and a w lower forming male 6 connected to the lower die; the second bending portion includes a u upper forming male 7 connected to the upper die and a u lower forming male 8 connected to the lower die.

[0034] Specifically, the angle between the inclined plane on the lower forming rod 6 for forming the side of the workpiece and the horizontal plane is 25°-40°.

[0035] The working principle or working process of this embodiment is as follows: when the material strip is stamped into shape, the material strip is first stamped into a W shape, and then the W-shaped material strip is stamped into a U-shaped material strip, and finally the U-shaped material strip is negatively shaped so that the U-shaped bending surface of the material strip enters a negative angle state, giving the material strip space to rebound.

[0036] Beneficial effects of this embodiment: when the upper shaping male 1 extends into the gap between the lower shaping male 2 and the reverse push block 3, the first chamfer and the second inclined surface 302 can guide the upper shaping male 1, making it easier for the upper shaping male 1 to rotate in the accommodating groove 4 and smoothly enter the gap between the lower shaping male 2 and the reverse push block 3. In addition, the first chamfer can also facilitate the extrusion of the material strip to fit with the lower shaping male 2. When the "J"-shaped workpiece is stamped, the one-time bending and forming process of the material strip is modified to first perform a W-shaped bend and then a U-shaped bend, and the material strip is processed in steps, so that the angle of each bending of the material strip becomes smaller, which can reduce the accumulation of internal stress of the material caused by large-angle processing and forming, and thus reduce the probability and degree of quality defects of the material strip. When the material strip is W-formed, when the angle between the inclined plane of the side of the workpiece and the horizontal plane is 25°-40°, the accumulation of internal stress of the material can be minimized during the bending process of the workpiece.

[0037] Example 3

[0038] Embodiment 3 of an adjustable rebound stamping die for a "J"-shaped bending part, as shown in Figure 1-Figure 5 As shown, based on Example 1 or Example 2, the structure of the mold is further limited.

[0039] Specifically, Figure 1 and Figure 3 As shown, the upper die includes an upper die base 10, an upper pad 11, an upper fixed plate 12, and a discharge pad 13 and a discharge plate 14 fixedly connected in sequence, and an elastic member 9, one end of the elastic member 9 passes through the upper fixed plate 12 and the upper pad 11 to be connected to the upper die base 10, and the other end is connected to the discharge pad 13, the accommodating groove 4 passes through the upper fixed plate 12, the discharge pad 13 and the discharge plate 14, the upper shaping male 1 is rotatably connected to the upper fixed plate 12, the w upper forming male 5 and the u upper forming male 7 are both fixedly connected to the upper fixed plate 12 and can pass through the discharge pad 13 and the discharge plate 14, the lower die includes a concave template 15, a lower template 16 and a lower die base 17 fixedly connected in sequence, the w lower forming male 6 and the u lower forming male 8 are both fixedly connected to the concave template 15, the lower shaping male 2 and the reverse push block 3 are provided with bolts, and the bolts are threadedly connected to the concave template 15.

[0040] Specifically, Figure 3As shown, a guide sleeve 18 is provided on one end of the stripper plate 14 close to the concave template 15, and a guide sleeve hole 1501 is provided on one end of the concave template 15 close to the stripper plate 14. The guide sleeve 18 can extend into the inner cavity of the guide sleeve hole 1501 and fit tightly with the guide sleeve hole 1501. The end of the guide sleeve 18 away from the stripper plate 14 and the end of the guide sleeve hole 1501 close to the stripper plate 14 are both chamfered.

[0041] Specifically, Figure 3 As shown, the concave plate 15 is also provided with a floating pin 19 for lifting the material strip, and the floating pin 19 is fixedly connected to the concave plate 15, and a clamping groove for clamping the material strip is provided on the floating pin 19. The concave plate 15 is provided with a material running inclined surface 1502 (the reference numeral 1502 is not shown in the figure. Please confirm), and the end of the material running inclined surface 1502 away from the negative angle shaping portion for flipping and falling the workpiece is inclined downward in the vertical direction.

[0042] The working principle or working process of this embodiment is as follows: when the driving unit drives the upper die to move downward, the stripper plate 14 first abuts against the concave die plate 15 of the lower die. Figure 4 Then the driving unit continues to drive the upper die downward, at which time the elastic member 9 is compressed, the unloading plate 14 and the unloading pad 13 remain relatively stationary with the lower die, the upper die seat 10, the upper pad 11 and the upper fixed plate 12 continue to approach the concave die plate 15, and the upper forming male 5, the upper forming male 7 and the upper shaping male 1 on the upper fixed plate 12 extend from the upper die to stamp and bend the material strip on the concave die plate 15. Figure 5 As shown, after the stamping is completed, the driving unit drives the upper die upward, first the elastic member 9 recovers its deformation, the upper die seat 10, the upper pad 11 and the upper fixed plate 12 move away from the concave die plate 15, and when the elastic member 9 is reset, the upper forming male 5, the upper forming male 7 and the upper shaping male 1 retract into the upper die, the driving unit continues to drive the upper die upward, the unloading plate 14 and the unloading pad 13 move away from the concave die plate 15 until they are reset, and the mold returns to its initial state.

[0043] The beneficial effects of this embodiment are as follows: when the upper die and the lower die are closed, the guide sleeve 18 first enters the guide sleeve hole 1501, and guides the descending upper die. The chamfered setting makes it easier for the guide sleeve 18 to smoothly extend into the guide sleeve hole 1501. The setting of the lifting pin 19 can lift the material strip, making it easier for the upper die to punch the material strip. When the formed workpiece is pushed onto the feed ramp 1502 by the material strip, the workpiece will fall from the lower die along the feed ramp 1502 into the designated collection device, and the feed ramp 1502 guides the workpiece that is about to fall. The threaded connection has high connection strength and is easy to disassemble.

[0044] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. An adjustable rebound stamping die for a "X"-shaped bending part, comprising an upper die and a lower die, characterized in that: The invention also comprises a negative angle shaping part, wherein the negative angle shaping part comprises an upper shaping pin (1), a lower shaping pin (2) and a reverse push block (3); a receiving groove (4) is provided on the upper die; one end of the upper shaping pin (1) is located in the receiving groove (4) and is rotatably connected to the upper die; the other end of the upper shaping pin (1) can extend from the inner cavity of the receiving groove (4); the lower shaping pin (2) and the reverse push block (3) are both detachably connected to the lower die; the lower shaping pin (2) is used to perform negative angle shaping on the workpiece. The side surface of the reverse push block (3) is an inclined side surface (201), the inclination angle of the inclined side surface (201) is the sum of the inclination angle of the workpiece and the estimated springback angle, the end surface of the reverse push block (3) close to the inclined side surface (201) is a first inclined surface (301), the first inclined surface (301) is parallel to the inclined side surface (201), and when the upper shaping male (1) is inserted into the gap between the reverse push block (3) and the lower shaping male (2), the upper shaping male (1) and the reverse push block (3) are in contact with each other.

2. The adjustable rebound stamping die for the "X"-shaped bending part according to claim 1, characterized in that: A first chamfer is provided on one end of the upper shaping male (1) that can extend from the accommodating groove (4), and a second inclined surface (302) is also provided on the reverse push block (3). The second inclined surface (302) is located on one end of the first inclined surface (301) close to the upper mold, and a side of the second inclined surface (302) close to the upper mold is inclined in a direction away from the lower shaping male (2), and the first chamfer is parallel to the second inclined surface (302).

3. The adjustable rebound stamping die for the "X"-shaped bending part according to claim 1, characterized in that: It also includes a first bending portion for realizing w-forming of the material strip and a second bending portion for realizing u-forming of the material strip. The first bending portion, the second bending portion and the negative angle shaping portion are arranged in sequence. The first bending portion includes a w upper forming male (5) connected to the upper die and a w lower forming male (6) connected to the lower die; the second bending portion includes a u upper forming male (7) connected to the upper die and a u lower forming male (8) connected to the lower die.

4. The adjustable rebound stamping die for the "X"-shaped bending part according to claim 3, characterized in that: The angle between the inclined plane on the lower forming rod (6) used to form the side of the workpiece and the horizontal plane is 25°-40°.

5. The adjustable rebound stamping die for the "X"-shaped bending part according to claim 3, characterized in that: The upper die comprises an upper die seat (10), an upper pad (11), an upper fixed plate (12), a discharge pad (13) and a discharge plate (14) which are fixedly connected in sequence, and an elastic member (9); one end of the elastic member (9) passes through the upper fixed plate (12) and the upper pad (11) to be connected to the upper die seat (10), and the other end is connected to the discharge pad (13); the accommodating groove (4) passes through the upper fixed plate (12), the discharge pad (13) and the discharge plate (14); the upper shaping male (1) is rotatably connected to the upper fixed plate (12); the w upper forming male (5) and the u upper forming male (7) are both fixedly connected to the upper fixed plate (12) and can pass through the discharge pad (13) and the discharge plate (14); The lower die comprises a concave die plate (15), a lower die plate (16) and a lower die seat (17) which are fixedly connected in sequence; the W lower forming pin (6) and the U lower forming pin (8) are both fixedly connected to the concave die plate (15); and the lower shaping pin (2) and the reverse push block (3) are detachably connected to the concave die plate (15).

6. The adjustable rebound stamping die for the "X"-shaped bending part according to claim 5, characterized in that: A guide sleeve (18) is provided on one end of the stripping plate (14) close to the concave template (15), and a guide sleeve hole (1501) is provided on one end of the concave template (15) close to the stripping plate (14). The guide sleeve (18) can extend into the inner cavity of the guide sleeve hole (1501) and fit tightly with the guide sleeve hole (1501).

7. The adjustable rebound stamping die for the "X"-shaped bending part according to claim 6, characterized in that: An end of the guide sleeve (18) away from the discharge plate (14) and an end of the guide sleeve hole (1501) close to the discharge plate (14) are both provided with chamfers.

8. The adjustable rebound stamping die for the "X"-shaped bending part according to claim 5, characterized in that: The concave mold plate (15) is also provided with a floating pin (19) for lifting the material strip. The floating pin (19) is fixedly connected to the concave mold plate (15). The floating pin (19) is provided with a slot for engaging the material strip.

9. The adjustable rebound stamping die for the "X"-shaped bending part according to claim 5, characterized in that: The concave mold plate (15) is provided with a material discharging inclined surface (1502) at one end thereof for discharging the workpiece, and the end of the material discharging inclined surface (1502) away from the negative angle shaping portion is inclined downward in the vertical direction for causing the workpiece to flip and fall.

10. The adjustable rebound stamping die for the "X"-shaped bending part according to claim 5, characterized in that: The lower shaping pin (2) and the reverse push block (3) are provided with bolts, and the bolts are threadedly connected to the concave template (15).

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