Lower die assembly for stamping and double-row hook stamping die with the lower die assembly

Abstract

A lower die assembly for stamping, comprising a base (20), a first punch (202), a second punch (203), and a blanking mechanism (3). The first punch (202) is disposed on the base (20) and has a first top wall (202a); the second punch (203) is disposed on the base (20) and is arranged side by side with the first punch (202). The second punch (203) has a second top wall (203a), and the second top wall (203a) is joined to the first top wall (202a) of the first punch (202); the blanking mechanism (3) is disposed on the base (20) and is used to move the workpiece on the first top wall (202a) of the first punch (202) to the second top wall (203a) of the second punch (203). The present application also discloses a double-row hook stamping die having the above lower die assembly. Compared with the prior art, the present application can improve work efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of cold stamping, and particularly relates to a lower die assembly for stamping and a double-row hook stamping die having the lower die assembly. Background Art

[0002] A cold stamping die refers to a special tool for processing product parts. The raw material of the part is at room temperature. The die is installed on a press such as a punching press or a hydraulic press. After applying force, the raw material of the part is separated or deformed, so as to obtain parts with a certain shape, size and performance.

[0003] According to different requirements of parts, cold stamping dies will have various processes to complete the production of parts, that is, multiple dies are required to complete them in sequence. For example, cutting dies, blanking dies, bending dies, forming dies, drawing dies, etc. These dies are usually called single-punch dies or single-station dies. With the development of technology, there have also emerged multi-station stamping dies that complete multiple processes on one die, usually called progressive dies or tandem dies.

[0004] The forming process of the double-row hook in the existing automotive safety tensioning device mostly includes a wire cutting process and multiple bending processes. After the wire is cut, the cut material is as Figure 1 shown; as Figure 2 shown, after the cut material is bent once, it becomes an inverted U-shaped double-row hook workpiece; as Figure 3 shown, after the inverted U-shaped double-row hook workpiece is bent, its two strip-shaped legs are brought together to obtain a double-row hook semi-finished product. Currently, the production of such double-row hooks is mainly by single-punch dies, with slow production speed, low efficiency and high production cost. Summary of the Invention

[0005] The first technical problem to be solved by the present invention is to provide a lower die assembly for stamping that can improve production efficiency in view of the current situation of the prior art.

[0006] The second technical problem to be solved by the present invention is to provide a double-row hook stamping die having the above-mentioned lower die assembly.

[0007] The technical solution adopted by the present invention to solve the above first technical problem is: a lower die assembly for stamping, comprising:

[0008] A base;

[0009] A first punch, disposed on the base and having a first top wall;

[0010] It is characterized in that it further comprises:

[0011] A second punch, disposed on the base, arranged side by side with the above-mentioned first punch, the second punch having a second top wall, and the second top wall being joined to the first top wall of the above-mentioned first punch;

[0012] The blank ejecting mechanism is arranged on the base and is used to move the workpiece on the first top wall of the first punch to the second top wall of the second punch.

[0013] Preferably, the first top wall of the first punch is flush with the second top wall of the second punch, and the two are joined to form a square top wall. The length direction of the square top wall extends along the horizontal second direction, and the width direction extends along the horizontal first direction perpendicular to the second direction.

[0014] Furthermore, the second top wall of the second punch extends outward along the second direction away from the first punch to form a discharging part. In this way, the workpieces after being punched by the second punch can be arranged on the discharging part and output from the discharging part.

[0015] Furthermore, the blank ejecting mechanism includes a blank ejecting cylinder whose output shaft can telescopically move along the second direction, and a pushing plate connected to the output shaft of the blank ejecting cylinder. The cross section of the pushing plate is in an inverted U shape with an opening, and the opening of the pushing plate faces downward and supports on the square top wall as the blank ejecting end of the above blank ejecting mechanism.

[0016] In the above-mentioned various solutions, preferably, the first punch further has a first side wall and a second side wall extending downward from the edge of the first top wall. The first side wall and the second side wall are oppositely arranged in the horizontal first direction, and an outer wall surface with an inverted U-shaped cross section is formed between them and the first top wall; the second punch is arranged side by side with the above first punch along the horizontal second direction perpendicular to the above first direction. The second punch further has a first inclined side wall and a second inclined side wall extending obliquely downward from the edge of the second top wall. The first inclined side wall and the second inclined side wall are oppositely arranged in the above first direction, and an outer wall surface with an inverted triangular cross section is formed between them and the second top wall.

[0017] The technical solution adopted by the present invention to solve the above-mentioned second technical problem is: a double-row hook stamping die having the lower die assembly as described above, characterized in that: it further includes an upper die and side dies. The upper die is arranged above the first punch and can move up and down, and has a cavity for forming an inverted U-shaped double-row hook workpiece that matches the first punch; there are at least two side dies and they are arranged on both sides of the second punch along the first direction. Each side die has a stamping inclined surface that cooperates with the inclined side wall on the corresponding side of the second punch, and the side die is arranged to be able to move along the first direction under the action of an external force.

[0018] In the above solution, to further improve the working efficiency, preferably, a swaging block with a first inclined surface is provided at the bottom of the upper die. The number of the swaging blocks matches the number of the side dies and is arranged on both sides of the above-mentioned cavity corresponding to their respective side dies. Each side die has a second inclined surface that cooperates with the first inclined surface of the corresponding swaging block, so that each side die can move along the second direction and approach each other when the upper die moves downward. At the same time, the above double-row hook stamping die further includes an elastic member acting on each side die, so that each side die always has a tendency to move away from each other along the second direction. In this way, when the upper die moves downward to stamp the wire on the first punch, the inverted U-shaped double-row hook workpiece on the second punch can be stamped at the same time, which serves two purposes and has a positive significance.

[0019] In each of the above solutions, to realize wire feeding, preferably, a wire feeding member is further provided on the base, which is used to convey the wire to above the first top wall of the first punch and make the wire extend along the first direction.

[0020] Preferably, the wire feeding member includes a feeding seat, a feeding table, and a wire feeding driving member. The feeding seat is located beside the first punch and is arranged at an interval along the first direction with the first punch. The feeding seat is provided with a feeding groove extending along the first direction. The feeding table has an inclined surface that is inclined up and down for placing a plurality of wires side by side. The bottom of the inclined surface is connected to the bottom of the feeding groove. The wire feeding driving member has a wire feeding end that can move along the first direction and is used to push the wire on the inclined surface into the feeding groove.

[0021] Also preferably, the wire feeding member includes a feeding seat. The feeding seat is located beside the first punch and is arranged at an interval along the first direction with the first punch. The feeding seat is provided with a feeding groove extending along the first direction. It further includes a cutting member provided at the bottom of the upper die for cutting the wire. The cutting member cuts the wire during the downward movement of the upper die.

[0022] In each of the above solutions, the first direction is the left-right direction, and the second direction is the front-back direction. Of course, the first direction can also be the front-back direction, and the second direction is the left-right direction. Or the first and second directions are other directions that are perpendicular to each other and basically horizontally extended.

[0023] Compared with the prior art, the advantages of the present invention are as follows: By adding a second punch and a blank holding mechanism on the base with the first punch, and the second top wall of the second punch is joined to the first top wall of the first punch, so that the workpiece stamped on the first punch can directly move to the second punch for the next stamping. In this way, the two stamping processes can be carried out on the same die, thereby improving the production speed and production efficiency and reducing the production cost. And the two stamping processes in this application can also be used separately. And the structure of this application is simple and easy to implement. Brief Description of the Drawings

[0024] Figure 1 It is a schematic structural view of the cut material obtained after cutting a wire in the prior art;

[0025] Figure 2 It is Figure 1 a schematic structural view of an inverted U-shaped double-row hook workpiece obtained after a single bending of the cut material in

[0026] Figure 3 It is Figure 2 a schematic structural view of a double-row hook semi-finished product obtained after bending the inverted U-shaped double-row hook workpiece in

[0027] Figure 4 It is the front view of the first embodiment of the present invention;

[0028] Figure 5 It is the schematic structural view of the first embodiment of the present invention;

[0029] Figure 6 It is the schematic structural view of the first embodiment of the present invention from another perspective;

[0030] Figure 7 It is the schematic structural view of the first embodiment of the present invention during the wire feeding process;

[0031] Figure 8 It is the schematic structural view of the first embodiment of the present invention during the wire cutting process;

[0032] Figure 9 It is the schematic structural view of the first embodiment of the present invention during the stamping process of the cut material on the first punch;

[0033] Figure 10 It is the partial structural schematic view (the upper die is omitted) of the first embodiment of the present invention during the ejecting process;

[0034] Figure 11 It is the schematic structural view of the first embodiment of the present invention during the stamping process of the inverted U-shaped double-row hook workpiece on the second punch;

[0035] Figure 12 It is the usage state diagram (the upper die is omitted) of the first embodiment of the present invention;

[0036] Figure 13 It is the schematic structural view of the second embodiment of the present invention. Detailed Description of the Embodiments

[0037] The present invention will be further described in detail below in conjunction with the embodiments of the drawings.

[0038] Embodiment 1:

[0039] As shown in Figures 4 to 12As shown, it is a first preferred embodiment of a double-row hook stamping die of the present invention. The double-row hook stamping die includes an upper die 1, a lower die 2, a blanking mechanism 3, and a feeding member 5.

[0040] Among them, the lower die 2 includes a base 20, a first punch 202, a second punch 203, and a side die 205.

[0041] The base 20 includes a horizontally arranged lower template 213 and a lower die backing plate 212 provided on the lower template 213, and vertical guide columns 210 are provided at the corners of the lower template 213.

[0042] The first punch 202 is arranged at the center of the lower die backing plate 212 of the base 20, and has a first top wall 202a, a first side wall 202b and a second side wall 202c extending downward from the edge of the first top wall 202a. The first side wall 202b and the second side wall 202c are arranged opposite to each other in the first direction, and an outer wall surface with an inverted U-shaped cross section is formed between them and the first top wall 202a.

[0043] The second punch 203 is arranged on the lower die backing plate 212 of the base 20, and the second punch 203 is arranged side by side with the above-mentioned first punch 202 along a second direction perpendicular to the above-mentioned first direction. The second punch 203 has a second top wall 203a, a first inclined side wall 203b and a second inclined side wall 203c extending obliquely downward from the edge of the second top wall 203a. The first inclined side wall 203b and the second inclined side wall 203c are arranged opposite to each other in the above-mentioned first direction, and an outer wall surface with an inverted triangular cross section is formed between them and the second top wall 203a; at the same time, the second top wall 203a is joined to the first top wall 202a of the above-mentioned first punch 202, so that the inverted U-shaped double-row hook workpiece 402 on the first punch 202 can move along the second direction to the second top wall 203a. In this embodiment, the first top wall 202a of the first punch 202 is flush with the second top wall 203a of the second punch 203, and a square top wall is formed by joining them. The length direction of the square top wall extends along the above-mentioned second direction, and the width direction extends along the above-mentioned first direction. At the same time, the second top wall 203a of the second punch 203 extends outward along the second direction away from the first punch 202 to form a discharging portion 204. In this embodiment, the above-mentioned first direction is the left-right direction, and the second direction is the front-back direction.

[0044] The above-mentioned blank pushing mechanism 3 is arranged on the base 20 and is used to move the inverted U-shaped double-row hook workpiece 402 on the first punch 202 to the second punch 203. The blank pushing mechanism 3 has a blank pushing end that can move along the second direction. Specifically, the blank pushing mechanism 3 includes a blank pushing cylinder 301 whose output shaft can telescopically move along the second direction, and a pushing plate 303 connected to the output shaft of the blank pushing cylinder 301. The cross-section of the pushing plate 303 is in the shape of an inverted U with an opening, and the opening of the pushing plate 303 faces downward and is supported on the square top wall as the blank pushing end of the blank pushing mechanism 3.

[0045] There are two of the above-mentioned side dies 205, which are arranged on both sides of the second punch 203 along the first direction. Each side die 205 has a stamping inclined surface 205a that cooperates with the inclined side wall on the corresponding side of the second punch 203, and the side die 205 is arranged to be movable along the first direction under the action of an external force.

[0046] The upper die 1 is arranged above the lower die 2 so as to be movable up and down, and includes a die handle 101, an upper template 102, an upper backing plate 103, an upper die fixing plate 104, a female die 105, rollers 106, a pressing block, a wedge block 108, a cutting member 109, a guide bushing 110, and an inner guide post 111. Among them, the die handle 101, the upper template 102, the upper backing plate 103, the upper die fixing plate 104, and the female die 105 are arranged and connected in sequence from top to bottom, and the female die 105 is located directly above the first punch 205 and has a cavity 115 that faces and matches the first punch 202 for forming the inverted U-shaped double-row hook workpiece 402. There are two of the above-mentioned rollers 106, which are distributed on both sides of the cavity 115 along the first direction, and the rotating shafts of the rollers 106 extend along the second direction. There are two of the above-mentioned wedge blocks 108, which are arranged on both sides of the cavity 115 corresponding to their respective side dies 205. Each wedge block 108 has a first inclined surface 108a facing the female die 105, and each side die 205 has a second inclined surface 205b that cooperates with the first inclined surface 108a of the corresponding wedge block 108, so that each side die 205 can move along the second direction and approach each other when the upper die 1 moves downward. At the same time, the double-row hook stamping die further includes an elastic member 206 acting on each side die 205, so that each side die 205 always has a tendency to move away from each other along the second direction. In this embodiment, the elastic member 206 is a return spring. The cutting member 109 is a downwardly arranged cutting edge and is located between one of the wedge blocks 108 and the female die 105. The cutting member 109 cuts the wire 401 during the downward movement of the upper die 1, thereby obtaining a cut material suitable for stamping.

[0047] The above-mentioned feeding member 5 is disposed on the base 20, used to convey the wire material 401 onto the first top wall 202a of the above-mentioned first punch 202, and to make the wire material 401 extend along the first direction. Specifically, the feeding member 5 includes a feeding base 500. The feeding base 500 is located on the left side of the above-mentioned first punch 202, and a feeding groove 508 extending along the first direction is provided on the feeding base 500. The port of the feeding groove 508 opposite to the first punch 202 is a lower die cutting edge 509 that cooperates with the above-mentioned cutting edge. At the same time, a positioning block 214 for abutting against the end of the wire material 401 is further provided on the above-mentioned base 20, and the positioning block 214 is located on the right side of the above-mentioned first punch 202.

[0048] At the same time, this embodiment further includes a limiting member 215 for restricting the end of the wire material 401. The limiting member 215 is disposed on the base 20 and is located between the above-mentioned first punch 202 and the feeding member 5, so that the wire material 401 extends along the first direction and is located between the first punch 202 and the upper die 1; and the limiting member 215 releases the restriction on the wire material 401 when the upper die 1 moves downward to stamp the wire material 401. Specifically, the limiting member 215 includes two vertically arranged limiting rods spaced apart along the above-mentioned second direction. A gap for the wire material 401 to pass through is formed between the two limiting rods, and support portions for supporting the wire material 401 are provided on the opposite side walls of the two limiting rods. Both support portions are located at the upper part of the limiting rods, and a distance is left between them.

[0049] The double-row hook stamping die of this embodiment is divided into three stations. In the first step, the long wire material 401 is cut into cut materials. Immediately afterwards, the cut materials are pressed down into an inverted U-shaped double-row hook workpiece 402. Then, the ejector mechanism 3 ejects the inverted U-shaped double-row hook workpiece 402 to the next station, and the side die moves to press the materials on both sides of the inverted U-shaped double-row hook workpiece towards the center to merge into a double-row hook semi-finished product 403.

[0050] As Figure 7 、 8 , for the first station, the wire material 401 enters through the feeding groove 508, passes through the lower die cutting edge 509 until it abuts against the positioning block 214. At this time, the first punch 202 is located below the wire material 401. The upper die 1 moves downward, and the pressing block presses the wire material 401 onto the first punch 202. Continuing to move downward, the cutting edge cuts the wire material 401 into cut materials.

[0051] As Figure 9 , for the second station, the cut materials are immediately pressed down by the female die 105 and the roller 106 of the downward-moving upper die 1 to form an inverted U-shaped double-row hook workpiece 402.

[0052] As Figure 10After the upper die 1 is retracted upward, the ejection mechanism 3 is activated, and the inverted U-shaped double-row hook workpiece 402 is pushed forward a certain distance through the push plate 303, pushed to the third station, that is, onto the second punch 203, and then the push plate 303 is retracted.

[0053] like Figure 11 , the upper mold 1 descends again, and the two inclined wedge blocks 108 contact the two side molds 205, pushing the side molds 205 toward the second punch 203 in the center of the mold, bending the two sides of the inverted U-shaped double-row hook workpiece 402 together, and then the upper mold goes up, and the side molds 205 retreat under the action of the return spring to complete the molding process.

[0054] like Figure 12 After the upper mold 1 is retracted, the ejecting mechanism 3 moves again to push out the inverted U-shaped double-row hook workpiece 402 of the second station. The pushed out inverted U-shaped double-row hook workpiece 402 pushes the double-row hook semi-finished product of the third station forward a certain distance to the discharge section 204. After repeating the above action process, several double-row hook semi-finished products 403 will be neatly arranged on the discharge section 204 until it is full. The front double-row hook semi-finished product 403 will be pushed out of the discharge section 204 in the next action. The pushed out double-row hook semi-finished product 403 falls into the corresponding container by its own weight and is transferred to the next process. If this mold is used as part of a fully automatic production line, the pushed out double-row hook semi-finished product 403 will fall into the station of the next process and automatically be processed in the next process.

[0055] Embodiment 2:

[0056] like Figure 13 As shown, it is a preferred embodiment 2 of a double-row hook stamping die of the present invention. The double-row hook stamping die of this embodiment is basically the same as the embodiment 1, except that the feeding part 5 is different. The feeding part 5 of this embodiment includes a feeding seat 500, a feeding table 501, and a feeding drive member 502. The feeding seat 500 is located beside the above-mentioned first punch 202, and is spaced apart from the first punch 202 along the above-mentioned first direction, and a feeding trough 508 extending along the first direction is provided on the feeding seat 500. The feeding table 501 has an inclined table top 501a which is inclined up and down for placing multiple wires 401 side by side, and the bottom of the inclined table top 501a is connected with the bottom of the feed trough 508. The feeding drive member 502 has a feeding end 504 which can move along the first direction and is used to push the wire 401 on the inclined table top 501a into the above-mentioned feed trough 508. In this embodiment, the feeding drive member 502 is an electric cylinder, which is fixed relative to the base 20 of the lower mold 2. The electric cylinder is provided with a feeding rod that can move with the output shaft of the electric cylinder, and the end of the feeding rod serves as the feeding end 504 of the feeding drive member.

[0057] In this embodiment, the wire material 401 is a cut-off material obtained by cutting on other equipment first, and then the cut-off materials are neatly arranged on the inclined plane 501a of the feeding table 501 from top to bottom. The inclined plane 501a allows the cut-off materials to automatically roll to the bottom of the inclined plane 501a and align with the feeding chute 508. During operation, the electric cylinder acts to drive the feeding rod forward. After the feeding rod contacts the cut-off material, it pushes the cut-off material into the feeding chute 508 until the end of the cut-off material abuts against the positioning block 214. At this time, the upper die 1 descends to bend the cut-off material into an inverted U-shaped double-row hook workpiece 402. That is, in the second embodiment, there is no cutting action when the upper die 1 descends, and the bending directly starts. The subsequent action principle process is the same as that of the first embodiment and will not be elaborated here.

Claims

1. A double-row hook stamping die, including a lower die assembly for stamping, and the lower die assembly includes: A base (20); A first punch (202), provided on the base (20) and having a first top wall (202a); It is characterized in that The lower die assembly further includes: A second punch (203), provided on the base (20), arranged side by side with the above-mentioned first punch (202), the second punch (203) has a second top wall (203a), and the second top wall (203a) is joined to the first top wall (202a) of the above-mentioned first punch (202); A blank pushing mechanism (3), provided on the base (20), for moving the workpiece on the first top wall (202a) of the first punch (202) to the second top wall (203a) of the second punch (203); The first punch (202) further has a first side wall (202b) and a second side wall (202c) extending downward from the edge of the first top wall (202a). The first side wall (202b) and the second side wall (202c) are oppositely arranged in the horizontal first direction and form an outer wall surface with an inverted U-shaped cross-section with the first top wall (202a); The second punch (203) is arranged side by side with the above-mentioned first punch (202) along the horizontal second direction perpendicular to the above-mentioned first direction. The second punch (203) further has a first inclined side wall (203b) and a second inclined side wall (203c) extending obliquely downward from the edge of the second top wall (203a). The first inclined side wall (203b) and the second inclined side wall (203c) are oppositely arranged in the above-mentioned first direction and form an outer wall surface with an inverted triangular cross-section with the second top wall (203a); The double-row hook stamping die further includes an upper die (1) and side dies (205). The upper die (1) is movably arranged above the above-mentioned first punch (202) up and down and has a cavity (115) matching the first punch (202) for forming an inverted U-shaped double-row hook workpiece (402); There are at least two side dies (205) and they are arranged on both sides of the above-mentioned second punch (203) along the first direction. Each side die (205) has a stamping inclined surface (205a) matching the inclined side wall on the corresponding side of the second punch (203), and the side die (205) is arranged to be movable along the first direction under the action of an external force.

2. The double-row hook stamping die according to claim 1, It is characterized in that: The first top wall (202a) of the first punch (202) is flush with the second top wall (203a) of the second punch (203), and the two are joined to form a square top wall. The length direction of the square top wall extends along the horizontal second direction, and the width direction extends along the horizontal first direction perpendicular to the second direction.

3. The double-row hook stamping die according to claim 2, It is characterized in that: The second top wall (203a) of the second punch (203) extends outward along the second direction away from the first punch (202) to form a discharging part (204).

4. The double-row hook stamping die according to claim 2, characterized in that: the ejector mechanism (3) includes an ejector cylinder (301) whose output shaft can expand and contract along the second direction, and a push plate (303) connected to the output shaft of the ejector cylinder (301). The cross-section of the push plate (303) is in an inverted U shape with an opening. The opening of the push plate (303) faces downward and supports on the square top wall as the ejecting end of the ejector mechanism (3).

5. The double-row hook stamping die according to any one of claims 1 to 4, characterized in that: a wedge block (108) with a first inclined surface (108a) is provided at the bottom of the upper die (1). The number of the wedge blocks (108) matches the number of the side dies (205), and they are arranged on both sides of the cavity (115) corresponding to their respective side dies (205). Each side die (205) has a second inclined surface (205b) that cooperates with the first inclined surface (108a) of the corresponding wedge block (108), so that each side die (205) can move along the second direction and approach each other when the upper die (1) moves downward. At the same time, the double-row hook stamping die further includes an elastic member (206) acting on each side die (205) to make each side die (205) always have a tendency to move away from each other along the second direction.

6. The double-row hook stamping die according to any one of claims 1 to 4, characterized in that: it further includes a feeding member (5) provided on the base (20) for feeding the wire (401) above the first top wall (202a) of the first punch (202) and making the wire (401) extend along the first direction.

7. The double-row hook stamping die according to claim 6, characterized in that: the feeding member (5) includes a feeding seat (500), a feeding table (501), and a feeding driving member (502). The feeding seat (500) is located beside the first punch (202) and is spaced from the first punch (202) along the first direction. The feeding seat (500) is provided with a feeding groove (508) extending along the first direction. The feeding table (501) has an inclined table surface (501a) that is inclined up and down for placing a plurality of wires (401) side by side. The bottom of the inclined table surface (501a) is connected to the bottom of the feeding groove (508). The feeding driving member (502) has a feeding end (504) that can move along the first direction and is used to push the wire (401) on the inclined table surface (501a) into the feeding groove (508).

8. The double-row hook stamping die according to claim 6, characterized in that: The feeding member (5) includes a feeding base (500), the feeding base (500) is located beside the first punch (202), is arranged at an interval from the first punch (202) along the first direction, and a feeding groove (508) extending along the first direction is provided on the feeding base (500); further included is a cutting member (109) provided at the bottom of the upper die (1) for cutting the wire (401), and the cutting member (109) cuts the wire (401) during the downward movement of the upper die (1).

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