CN113894231A

CN113894231A - Lower die assembly for stamping and double-row hook stamping die with same

Info

Publication number: CN113894231A
Application number: CN202111337615.XA
Authority: CN
Inventors: 陈伟国; 陈燕琼; 邓伟; 缪方福
Original assignee: Ningbo Xuli Metal Products Co Ltd
Current assignee: Ningbo Xuli Metal Products Co Ltd
Priority date: 2021-11-09
Filing date: 2021-11-09
Publication date: 2022-01-07

Abstract

A lower die assembly for stamping comprises a base (20), a first male die (202), a second male die (203) and a material ejecting mechanism (3), wherein the first male die (202) is arranged on the base (20) and is provided with a first top wall (202 a); a second punch (203) provided on the base (20) and arranged side by side with the first punch (202), the second punch (203) having a second top wall (203a), the second top wall (203a) being engaged with the first top wall (202a) of the first punch (202); the ejection mechanism (3) is arranged on the base (20) and is used 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 application also discloses a double-row hook stamping die with the lower die assembly. Compared with the prior art, the method and the device can improve the working efficiency.

Description

Lower die assembly for stamping and double-row hook stamping die with same

Technical Field

The 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 with the lower die assembly.

Background

The cold stamping die is a special tool for processing product parts, the raw materials of the parts are at normal temperature, the die is arranged on a press machine such as a punch press, a hydraulic press and the like, and the raw materials of the parts are separated or deformed after force is applied, so that the parts with certain shape, size and performance are obtained.

The cold stamping die has many different processes according to different requirements of parts to complete the production of the parts, i.e. multiple pairs of dies are required to complete in sequence, such as a cutting die, a blanking die, a bending die, a forming die, a drawing die, and the like, and the dies are generally called single-punch dies or single-station dies. With the development of technology, there have also been multi-station press dies, commonly referred to as progressive dies or progressive dies, in which a plurality of processes are performed on one die.

The forming process of the double-row hook in the existing automobile safety tensioning device mostly comprises a wire cutting process and a plurality of bending processes, wherein a cut material obtained after the wire is cut is shown in figure 1; as shown in fig. 2, the cut material is bent once to form an inverted U-shaped workpiece with double hooks; as shown in fig. 3, after the inverted U-shaped workpiece with double rows of hooks is bent, the two strip-shaped support legs are mutually closed to obtain a semi-finished product with double rows of hooks. At present, the production of the double-row hooks is mainly the production of a single-punch die, and has the advantages of low production speed, lower efficiency and high production cost.

Disclosure of Invention

The first technical problem to be solved by the present invention is to provide a lower die assembly for stamping, which can improve the production efficiency, in view of the current state of the prior art.

The second technical problem to be solved by the invention is to provide a double-row hook stamping die with the lower die assembly.

The technical scheme adopted by the invention for solving the first technical problem is as follows: a lower die assembly for stamping comprising:

a base;

the first male die is arranged on the base and is provided with a first top wall;

it is characterized by also comprising:

a second punch provided on the base and arranged side by side with the first punch, the second punch having a second ceiling wall that is joined to the first ceiling wall of the first punch;

and the ejection mechanism is arranged on the base and used for moving the workpiece on the first top wall of the first male die to the second top wall of the second male die.

Preferably, the first top wall of the first male die is flush with the second top wall of the second male die, and a square top wall is formed by the first top wall and the second top wall, the length direction of the square top wall extends along a horizontal second direction, and the width direction of the square top wall extends along a horizontal first direction perpendicular to the second direction.

Further, the second top wall of the second male die extends outwards along a second direction far away from the first male die to form the discharging part. In this way, the workpiece punched by the second punch can be arranged on the discharging part and output from the discharging part.

Furthermore, the ejection mechanism comprises an ejection cylinder with an output shaft capable of stretching in the second direction and a material pushing plate connected with the output shaft of the ejection cylinder, the cross section of the material pushing plate is in an inverted U shape with an opening, and the opening of the material pushing plate is supported downwards on the square top wall to serve as an ejection end of the ejection mechanism.

In each of the above aspects, preferably, the first male die further has a first side wall and a second side wall formed by extending a first top wall edge downwards, the first side wall and the second side wall are arranged oppositely in a horizontal first direction, and form an outer wall surface with an inverted U-shaped cross section with the first top wall; the second male die and the first male die are arranged side by side along a horizontal second direction perpendicular to the first direction, the second male die is further provided with a first inclined side wall and a second inclined side wall, the first inclined side wall and the second inclined side wall are formed by obliquely and downwardly extending the edge of a second top wall, the first inclined side wall and the second inclined side wall are oppositely arranged in the first direction, and an outer wall surface with an inverted triangular cross section is formed between the first inclined side wall and the second top wall.

The technical scheme adopted by the invention for solving the second technical problem is as follows: the utility model provides a have as above double hook stamping die of lower mould subassembly which characterized in that: the die comprises a first male die, a second male die, a die cavity and a side die, wherein the first male die is arranged above the second male die in a vertically movable mode, and the second male die is provided with a cavity matched with the first male die and used for forming an inverted U-shaped double-row hook workpiece; the side dies are provided with at least two side dies and are arranged on two sides of the second male die along a first direction, each side die is provided with a stamping inclined surface matched with the inclined side wall on the corresponding side of the second male die, and the side dies can move along the first direction under the action of external force.

In the above scheme, to further improve the working efficiency, preferably, the bottom of the upper die is provided with tapered wedges with first inclined surfaces, the number of the tapered wedges is matched with the number of the side dies, the tapered wedges are arranged on two sides of the cavity corresponding to the respective side dies, and each side die is provided with a second inclined surface matched with the first inclined surface of the corresponding tapered wedge, so that the side dies can move along the second direction to be close to each other when the upper die moves downwards. So, go up the mould and move down and when the wire rod on the punching press first terrace die, can also realize the punching press of the double hook work piece of the type of falling U on the second terrace die simultaneously, and then kill two birds with one stone, have positive meaning.

In each of the above solutions, in order to achieve feeding, it is preferable that a feeding member is further included, which is provided on the base, and is configured to feed the wire onto the first top wall of the first male die and extend the wire in the first direction.

Preferably, the feeding part comprises a feeding seat, a feeding table and a feeding driving part, the feeding seat is located beside the first male die and is arranged between the first male die at intervals along the first direction, a feeding groove extending along the first direction is formed in the feeding seat, the feeding table is provided with an inclined table top which is inclined up and down and used for placing a plurality of wires side by side, the bottom of the inclined table top is connected with the groove bottom of the feeding groove, and the feeding driving part is provided with a feeding end which can move along the first direction and used for pushing the wires on the inclined table top into the feeding groove.

Also preferably, the feeding member comprises a feeding seat, the feeding seat is located beside the first male die and is arranged at an interval with the first male die along the first direction, and a feeding groove extending along the first direction is formed in the feeding seat; the wire cutting device is characterized by further comprising a cutting piece arranged at the bottom of the upper die and used for cutting a wire, and the cutting piece cuts off the wire in the downward moving process of the upper die.

In each of the above aspects, the first direction is a left-right direction, and the second direction is a front-rear direction. Of course, the first direction may be a front-rear direction, and the second direction may be a left-right direction. Or the first and second directions are the other directions extending vertically and substantially horizontally.

Compared with the prior art, the invention has the advantages that: through add second terrace die, liftout mechanism on the base that has first terrace die, and the second roof of second terrace die and the first roof of first terrace die joint to the work piece that makes on the punching press on the first terrace die can directly move and carry out punching press on next step on the second terrace die, so, make twice punching press process can go on same mould, and then can improve production speed, production efficiency, and can reduction in production cost. And the two stamping processes in the application can also be used independently. And the structure is simple, and the implementation is convenient.

Drawings

FIG. 1 is a schematic view of a cut-off material obtained after cutting a wire material in the prior art;

fig. 2 is a schematic structural diagram of an inverted U-shaped double-row hook workpiece obtained after the cut material in fig. 1 is bent for one time;

fig. 3 is a schematic structural diagram of a double-row hook semi-finished product obtained after bending the inverted U-shaped double-row hook workpiece in fig. 2;

FIG. 4 is a front view of the first embodiment of the present invention;

FIG. 5 is a schematic structural diagram according to a first embodiment of the present invention;

FIG. 6 is a schematic structural diagram of another view according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a wire feeding process in an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a wire cutting process according to an embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a first punch for performing a stamping process on a cut-off material according to a first embodiment of the present invention;

fig. 10 is a schematic partial structure view (upper die omitted) in the material ejection process according to the first embodiment of the present invention;

fig. 11 is a schematic structural diagram of an inverted U-shaped workpiece with two rows of hooks performing a stamping process on a second male die according to a first embodiment of the present invention;

FIG. 12 is a diagram illustrating a state of use of the first embodiment of the present invention (upper mold is omitted);

fig. 13 is a schematic structural diagram of a second embodiment of the present invention.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

The first embodiment is as follows:

as shown in fig. 4 to 12, a first preferred embodiment of a double-row hook stamping die according to the present invention includes an upper die 1, a lower die 2, an ejecting mechanism 3, and a feeding member 5.

The lower die 2 includes a base 20, a first punch 202, a second punch 203, and a side die 205.

The base 20 includes a lower template 213 horizontally disposed, and a lower backing plate 212 disposed on the lower template 213, and vertical guide posts 210 are disposed on corners of the lower template 213.

The first male die 202 is disposed in the center of the lower die plate 212 of the base 20, and has a first top wall 202a, a first side wall 202b formed by extending the edge of the first top wall 202a downward, and a second side wall 202c, wherein the first side wall 202b and the second side wall 202c are arranged opposite to each other in the first direction, and form an outer wall surface with an inverted U-shaped cross section with the first top wall 202 a.

The second punch 203 is arranged on the lower die cushion plate 212 of the base 20, and the second punch 203 and the first punch 202 are arranged side by side along a second direction perpendicular to the 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 formed by obliquely and downwardly extending 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 first direction, and form an outer wall surface with an inverted triangle structure in section with the second top wall 203 a; at the same time, the second ceiling wall 203a is engaged with the first ceiling wall 202a of the first punch 202 described above, so that the double-row hook workpiece 402 of the inverted U shape on the first punch 202 is moved onto the second ceiling wall 203a in the second direction. 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 joined therebetween, and the square top wall has a length direction extending in the second direction and a width direction extending in the first direction. Meanwhile, the second top wall 203a of the second punch 203 extends outward in a second direction away from the first punch 202 to form the discharge portion 204. In this embodiment, the first direction is a left-right direction, and the second direction is a front-back direction.

The ejecting mechanism 3 is disposed on the base 20, and is configured to move the inverted U-shaped double-row hook workpiece 402 on the first punch 202 to the second punch 203, and the ejecting mechanism 3 has an ejecting end capable of moving in the second direction. Specifically, the ejector mechanism 3 includes an ejector cylinder 301 having an output shaft capable of extending and retracting in the second direction, and a material pushing plate 303 connected to the output shaft of the ejector cylinder 301, the material pushing plate 303 has an inverted U-shaped cross section with an opening, and the opening of the material pushing plate 303 is supported downward on a square top wall as an ejector end of the ejector mechanism 3.

The two side dies 205 are provided on both sides of the second punch 203 in the first direction, each side die 205 has a punch slope 205a that is engaged with a corresponding side slope of the second punch 203, and the side dies 205 are arranged to be movable in the first direction by an external force.

The upper mold 1 is disposed above the lower mold 2 so as to be movable up and down, and includes a mold shank 101, an upper mold plate 102, an upper cushion plate 103, an upper mold fixing plate 104, a female mold 105, a roller 106, a press block, a wedge 108, a cutter 109, a guide bush 110, and an inner guide post 111. The die shank 101, the upper die plate 102, the upper backing plate 103, the upper die fixing plate 104 and the female die 105 are sequentially arranged from top to bottom and connected, the female die 105 is positioned right above the first male die 205, and the female die 105 is provided with a die cavity 115 which is opposite to and matched with the first male die 202 and used for forming an inverted U-shaped double-row hook workpiece 402. The two rollers 106 are disposed at both sides of the cavity 115 along a first direction, and the rotation shaft of each roller 106 extends along a second direction. The two inclined wedges 108 are arranged at two sides of the cavity 115 corresponding to the respective side dies 205, each inclined wedge 108 is provided with a first inclined surface 108a opposite to the female die 105, each side die 205 is provided with a second inclined surface 205b matched with the first inclined surface 108a of the corresponding inclined wedge 108, so that the side dies 205 can move along the second direction to be close to each other when the upper die 1 moves downwards, and meanwhile, the double-row hook stamping die also comprises an elastic element 206 acting on each side die 205, so that the side dies 205 always have the tendency of moving along the second direction to be away from each other. In this embodiment, the elastic member 206 is a return spring. The cutting member 109 is a downwardly disposed cutting edge and is located between one of the wedges 108 and the die 105. The cutter 109 cuts the wire 401 during the downward movement of the upper die 1, thereby obtaining a cut material suitable for punching.

The feeder 5 is provided on the base 20, and is configured to feed the wire 401 onto the first top wall 202a of the first punch 202 and extend the wire 401 in the first direction. Specifically, the feeder 5 includes a feeding seat 500, the feeding seat 500 is located on the left side of the first punch 202, and a feeding groove 508 extending in the first direction is provided on the feeding seat 500. The end of the feed chute 508 opposite the first punch 202 is a lower die cutting edge 509 that mates with the cutting edge. Meanwhile, the base 20 is further provided with a positioning block 214 for abutting against an end of the wire 401, and the positioning block 214 is positioned on the right side of the first punch 202.

Meanwhile, the embodiment further includes a limiting member 215 for limiting the end of the wire 401, where the limiting member 215 is disposed on the base 20 and located between the first punch 202 and the feeder 5, so that the wire 401 extends along the first direction and is located between the first punch 202 and the upper die 1; the stopper 215 releases the restraint of the wire 401 in a state where the upper die 1 moves down to press the wire 401. Specifically, the limiting part 215 includes two vertically arranged limiting rods arranged at intervals along the second direction, a gap for the wire 401 to pass through is formed between the two limiting rods, and supporting parts for supporting the wire 401 are arranged on opposite side walls of the two limiting rods, the two supporting parts are both located on the upper parts of the limiting rods, and a distance is reserved between the two supporting parts.

The double-row hook stamping die of the embodiment is divided into three stations, a long wire 401 is cut into a cut material in the first step, the cut material is pressed downwards to form an inverted U-shaped double-row hook workpiece 402, then the ejecting 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 two sides of the inverted U-shaped double-row hook workpiece towards the center and close the materials to form a double-row hook semi-finished product 403.

Referring to fig. 7 and 8, in the first station, the wire 401 enters from the feeding chute 508 and passes through the lower die cutting edge 509 until the positioning block 214 is pressed, at which time the first punch 202 is located below the wire 401, the upper die 1 moves downwards, the pressing block presses the wire 401 onto the first punch 202, and the pressing block continues to move downwards, and the cutting edge cuts the wire 401 into cut pieces.

Referring to fig. 9, in the second station, the cut material is pressed down by the concave die 105 and the roller 106 of the descending upper die 1 to form an inverted U-shaped double-row hook workpiece 402.

As shown in fig. 10, after the upper die 1 retracts upward, the ejector mechanism 3 operates to push the inverted U-shaped double-row hook workpiece 402 forward by a certain distance through the stripper plate 303 to the third station, i.e., the second punch 203, and then the stripper plate 303 retracts.

As shown in fig. 11, the upper die 1 descends again, the two inclined wedges 108 contact the two side dies 205, the side dies 205 are pushed to the second male die 203 at the center of the die, the two sides of the inverted U-shaped double-row hook workpiece 402 are bent and closed, then the upper die ascends, the side dies 205 retract under the action of the return spring, and the forming process is completed.

As shown in fig. 12, after the upper die 1 is retracted, the ejector mechanism 3 operates again to push out the inverted U-shaped double-row hook workpiece 402 at the second station, the pushed-out inverted U-shaped double-row hook workpiece 402 pushes forward the double-row hook semi-finished product at the third station for a certain distance to the discharge part 204, after the above operation processes are repeated, a plurality of double-row hook semi-finished products 403 are arranged on the discharge part 204 in order until the discharge part is full, the front double-row hook semi-finished product 403 is pushed out of the discharge part 204 in the next operation, and the pushed-out double-row hook semi-finished product 403 falls down into a corresponding container by self weight and is transferred to the next operation. If the mold is used as a part of a full-automatic production line, the pushed-out semi-finished product 403 with double rows of hooks falls into the station of the next procedure, and the next procedure is automatically processed.

Example two:

as shown in fig. 13, a second preferred embodiment of the double row hook stamping die of the present invention is basically the same as the first preferred embodiment, except that the feeding member 5 is different from the first preferred embodiment, the feeding member 5 of the present embodiment 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 spaced apart from the first punch 202 along the first direction, the feeding seat 500 is provided with a feeding slot 508 extending along the first direction, the feeding table 501 has an inclined table surface 501a inclined up and down for placing a plurality of wires 401 side by side, the bottom of the inclined table surface 501a is connected with the bottom of the feeding slot 508, and the feeding driving member 502 has a feeding end 504 capable of moving along the first direction for pushing the wires 401 on the inclined table surface 501a into the feeding slot 508. In this embodiment, the feeding driving member 502 is an electric cylinder fixed relative to the base 20 of the lower mold 2, a feeding rod capable of moving along with an output shaft of the electric cylinder is disposed on the electric cylinder, and an end of the feeding rod serves as a feeding end 504 of the feeding driving member.

The wire 401 in this embodiment is a cut material obtained by cutting on another device, and then the cut material is arranged on the inclined plane 501a of the feeding table 501 from top to bottom in order, and the inclined plane 501a allows the cut material to automatically roll into the bottommost part of the inclined plane 501a and align with the feeding chute 508. During operation, the electric cylinder acts to drive the feeding rod to move forward, and after the feeding rod contacts the cut-off material, the cut-off material is pushed into the feeding groove 508 until the end part of the cut-off material pushes against the positioning block 214. At this time, the upper die 1 moves downward to bend the cut material into the inverted U-shaped double-row hook workpiece 402, that is, in the second embodiment, the bending is directly started without any cutting operation when the upper die 1 moves downward. The following operation principle process is the same as the first embodiment, and is not described again.

Claims

1. A lower die assembly for stamping comprising:

a base (20);

a first punch (202) provided on the base (20) and having a first top wall (202 a);

it is characterized by also comprising:

a second punch (203) provided on the base (20) and arranged side by side with the first punch (202), the second punch (203) having a second top wall (203a), the second top wall (203a) being joined to the first top wall (202a) of the first punch (202);

the ejection mechanism (3) is arranged on the base (20) and is used 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).

2. The lower die assembly of claim 1, wherein: the first top wall (202a) of the first male die (202) is flush with the second top wall (203a) of the second male die (203), and a square top wall is jointed between the first top wall and the second top wall, the length direction of the square top wall extends along a horizontal second direction, and the width direction of the square top wall extends along a horizontal first direction which is vertical to the second direction.

3. The lower die assembly of claim 2, wherein: and a second top wall (203a) of the second male die (203) extends outwards along a second direction far away from the first male die (202) to form a discharging part (204).

4. The lower die assembly of claim 2, wherein: the ejection mechanism (3) comprises an ejection cylinder (301) with an output shaft capable of stretching along the second direction and a material pushing plate (303) connected with the output shaft of the ejection cylinder (301), the cross section of the material pushing plate (303) is in an inverted U shape with an opening, and the opening of the material pushing plate (303) is supported downwards on the square top wall to serve as an ejection end of the ejection mechanism (3).

5. A lower die assembly according to any one of claims 1 to 4 wherein: the first male die (202) is also provided with a first side wall (202b) and a second side wall (202c) which are formed by downwards extending the edge of a first top wall (202a), the first side wall (202b) and the second side wall (202c) are oppositely arranged in the horizontal first direction, and an outer wall surface with an inverted U-shaped structure in section is formed between the first side wall and the first top wall (202 a); the second male die (203) and the first male die (202) are arranged side by side along a horizontal second direction perpendicular to the first direction, the second male die (203) further comprises a first inclined side wall (203b) and a second inclined side wall (203c) which are formed by obliquely and downwardly extending edges of a second top wall (203a), the first inclined side wall (203b) and the second inclined side wall (203c) are oppositely arranged in the first direction, and an outer wall surface with an inverted triangular structure in cross section is formed between the first inclined side wall and the second top wall (203 a).

6. A double row hook stamping die having the lower die assembly of claim 5, wherein: the die comprises an upper die (1) and a side die (205), wherein the upper die (1) is arranged above the first male die (202) in a vertically movable manner and is provided with a cavity (115) which is matched with the first male die (202) and used for forming an inverted U-shaped double-row hook workpiece (402); the side dies (205) are provided with at least two side dies and are arranged on two sides of the second male die (203) along the first direction, each side die (205) is provided with a stamping inclined surface (205a) matched with the inclined side wall on the corresponding side of the second male die (203), and the side dies (205) can move along the first direction under the action of external force.

7. The double row hook stamping die of claim 6, wherein: the double-row hook stamping die comprises an upper die (1), wherein the bottom of the upper die (1) is provided with inclined wedges (108) with first inclined surfaces (108a), the number of the inclined wedges (108) is matched with that of the side dies (205), the inclined wedges are arranged on two sides of the cavity (115) corresponding to the respective side dies (205), each side die (205) is provided with a second inclined surface (205b) matched with the first inclined surface (108a) of the corresponding inclined wedge (108), so that the side dies (205) can move in a second direction to be close to each other when the upper die (1) moves downwards, and meanwhile, the double-row hook stamping die further comprises elastic parts (206) acting on the side dies (205) so that the side dies (205) always have the tendency of moving in the second direction to be away from each other.

8. The double row hook stamping die of claim 6, wherein: the wire feeding device further comprises a feeding piece (5) which is arranged on the base (20) and used for feeding the wire (401) to the first top wall (202a) of the first punch (202) and enabling the wire (401) to extend along the first direction.

9. The double row hook stamping die of claim 8, wherein: the feeding part (5) comprises a feeding seat (500), a feeding table (501) and a feeding driving part (502), the feeding seat (500) is located beside the first male die (202) and is arranged at intervals with the first male die (202) along the first direction, a feeding groove (508) extending along the first direction is formed in the feeding seat (500), the feeding table (501) is provided with an inclined table top (501a) which is inclined up and down and used for placing a plurality of wires (401) side by side, the bottom of the inclined table top (501a) is connected with the groove bottom of the feeding groove (508), and the feeding driving part (502) is provided with a feeding end (504) which can move along the first direction and is used for pushing the wires (401) on the inclined table top (501a) into the feeding groove (508).

10. The double row hook stamping die of claim 8, wherein: the feeding piece (5) comprises a feeding seat (500), the feeding seat (500) is positioned beside the first male die (202) and is arranged at intervals with the first male die (202) along the first direction, and a feeding groove (508) extending along the first direction is formed in the feeding seat (500); the wire cutting device is characterized by further comprising a cutting piece (109) arranged at the bottom of the upper die (1) and used for cutting the wire (401), and the cutting piece (109) cuts off the wire (401) in the downward moving process of the upper die (1).