CN205732465U - The pre-stamping die in traditional method of indicating the pronunciation of a Chinese character limit - Google Patents

Abstract

The utility model discloses an anti-cut edge pre-punching die, which comprises a lower die and an upper die matched with the lower die; the lower die includes a concave template, and punch holes are arranged on the concave template; The stripping plate, the rubber on the stripping plate, the upper splint and the punch above the stripping plate, the buffer rubber is set between the upper splint and the stripping plate, the upper end of the punch is set on the upper splint, punching The head passes through the stripper plate, and the end of the lower end of the punch is provided with a trimming edge; the punch hole is located at a position matched with the lower end of the punch, and when the mold is closed, part of the side wall of the edge trimming edge extends into the punch hole. The utility model adopts the above structure, when the mold is closed, the punch moves downward, and the height of the mold clamping is adjusted so that part of the side wall of the cutting edge extends into the punch hole, thereby avoiding the burr on the front of the workpiece caused by the next fine blanking process. Improve the product quality, avoid the increase of the process and speed up the production efficiency; meet the requirements of the drawings without affecting the surrounding dimensions.

Description

Anti-trimming pre-punching die

technical field

The utility model relates to the technical field of moulds, in particular to an anti-trimming pre-punching mould.

Background technique

In the existing production process of the steel back 101 for automobiles (as shown in FIGS. 1 and 2 ), the steel back 101 directly enters the fine blanking process after the embossing process. With this process, after the fine blanking of the steel back 101, the front burrs will be pulled up at the embossed part (A part in Fig. 2), which will lead to unqualified product inspection and a low product pass rate. If the output of the product is too large, it is necessary to arrange employees to grind and polish the burr of the product. In this way, one station has to be added, the labor cost will increase, and the production efficiency will also be reduced.

In order to avoid the problem of front burrs during fine blanking caused by local processing, the principle of pre-punching can be used to add a reverse trimming process after embossing, and half of the steel back product is pre-punched first, and the steel back 101 after pre-punching is formed as shown in Figure 3 If the edge trimming structure 102 of the steel back is shown, the steel back 101 after fine blanking will not produce burrs at the B position. But there is no special reverse trimming pre-punching die designed for this reverse trimming process at present.

Utility model content

The purpose of the utility model is to disclose a reverse trimming pre-punching die, which solves the problem that a special reverse trimming pre-punching die is not designed for the reverse trimming process of the steel back, which leads to the problem that the front burrs of the steel back are pulled up in the subsequent fine blanking process.

In order to achieve the above object, the utility model adopts the following technical solutions:

The reverse edge trimming pre-punching mold includes a lower mold and an upper mold matched with the lower mold; the lower mold includes a concave template, and punch holes are arranged on the concave template; The rubber on the stripper plate, the upper splint and the punch above the stripper plate, the buffer rubber is set between the upper splint and the stripper plate, the upper end of the punch is set on the upper splint, and the punch passes through the stripper plate, the end of the lower end of the punch is provided with a trimming knife edge; the punch hole is located at a position matched with the lower end of the punch, and when the mold is closed, part of the side wall of the trimming knife edge extends into the punch hole.

Further, the cross section of the cutting edge is rectangular.

Further, the lower mold includes a lower mold base, a lower backing plate on the lower mold base, and a concave template on the lower backing plate from bottom to top; the lower mold base, the lower backing plate and the concave template pass through the connecting piece Fixed.

Further, the lower die also includes positioning pins, which are arranged on the concave template; the stripper plate is provided with positioning holes that cooperate with the positioning pins.

Further, the lower mold also includes a thimble for returning materials; the lower mold base and the lower backing plate form a countersunk hole for the thimble, and the thimble is provided with a countersunk head and is movably clamped through the countersunk head and the countersunk hole of the thimble to realize Displacement in the counterbore of the thimble; the concave template is provided with a through hole for the thimble located on the counterbore of the thimble, and the through hole of the thimble cooperates with the thimble and allows the thimble to pass through.

Further, it also includes a guide post arranged on the upper splint and a guide sleeve provided on the concave template, and the guide post and the guide sleeve are located at positions that cooperate with each other.

Further, the upper mold also includes an upper mold base on the upper clamping plate and a die handle on the upper mold base from bottom to top; the upper mold base, the upper clamping plate, the rubber and the stripper plate pass through The connecting piece is fixedly connected, and the upper mold base and the upper splint are fixedly connected through the connecting piece.

Compared with the prior art, the utility model has the beneficial effects:

1. The utility model adopts a structure with a trimming knife edge at the lower end of the punch. When the mold is closed, the punch is moved downward, and the height of the mold clamping is adjusted so that part of the side wall of the trimming knife edge extends into the punch hole, and the punch cuts to About half of the thickness of the workpiece, without affecting the performance and expected appearance of the workpiece, use the trimming edge of the punch to pre-puncher and connect, use small gap punching, the guide gap should not be greater than the trimming gap, so as to avoid the fine blanking process The burr on the front of the workpiece is pulled up, which improves product quality, avoids the increase of the process and speeds up the production efficiency; at the same time, it meets the requirements of the drawing without affecting the surrounding dimensions while ensuring that the hypotenuse of the workpiece does not produce burrs.

2. The rubber structure is used to buffer the stripping plate to prolong the service life of the mold. At the same time, the rubber utilizes the resilience and the thimble to jointly eject the workpiece, with a simple structure and good effect.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some implementations of the present invention. For example, those skilled in the art can also obtain other drawings based on these drawings without paying creative labor.

Fig. 1 is the front schematic diagram of existing steel back;

Fig. 2 is a schematic partial cross-sectional view of the L portion in Fig. 1 along the M-M direction;

Fig. 3 is a schematic diagram of Fig. 2 after the reverse trimming and pre-flushing of the utility model;

Fig. 4 is a schematic cross-sectional view of an embodiment of the reverse trimming pre-punching die of the present invention;

FIG. 5 is an enlarged schematic view of part I in FIG. 4 .

In the figure, 1-lower mold base; 2-lower backing plate; 3-concave template; 31-punch hole; 32-thimble through hole; 4-removal plate; 41-positioning hole; Plywood; 7-upper die base; 8-die handle; 9-punch; 91-trimming edge; 10-locating pin; 11-thimble; 111-sunk head; - guide sleeve; 101 - steel back; 102 - trimming structure of steel back.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example.

As shown in the embodiment of Fig. 4 and Fig. 5, the back trimming pre-punching die includes a lower die and an upper die matched with the lower die. Lower mold comprises lower die base 1, the lower backing plate 2 that is located on the lower die base 1, the concave template 3 that is located on the lower backing plate 2 from bottom to top. From bottom to top, the upper mold includes the stripper plate 4 above the concave template 3, the rubber 5 on the stripper plate 4, the upper splint 6 above the stripper plate 4, and the upper mold on the upper splint 6. Seat 7, die handle 8 and punch 9 that are located on the upper die seat 7. The rubber 5 is arranged between the upper splint 6 and the stripping plate 4 to play a buffering role. The upper end of the punch 9 is arranged on the upper splint 6, the punch 9 passes through the stripper plate 4, and the end of the lower end of the punch is provided with a trimming edge 91 for forming a workpiece trimming structure (such as a steel back trimming structure 102), The cross section of edge trimming knife edge 91 is rectangular. Die template 3 is provided with punch hole 31, and punch hole 31 is positioned at the position that cooperates with the lower end of punch, and when the present embodiment closes mold, part side wall of trimming knife edge 91 stretches in the punch hole 31.

The lower die also includes a positioning pin 10 and a thimble 11 for ejecting the workpiece to realize material return. The stripper plate 4 is provided with a positioning hole 41 cooperating with the positioning pin 10, and the positioning pin 10 is arranged on the concave template 3. When the mold is closed, the positioning pin 10 passes through the workpiece (such as a steel back 101) and extends into the positioning hole 41, and the lower mold The seat 7 and the lower backing plate 2 form a countersunk hole 12 for the thimble, and the thimble 11 is provided with a countersunk head 111 and is movably engaged with the countersunk 111 and the countersunk hole 12 of the thimble to realize displacement in the countersunk hole 12 of the thimble. The concave template 3 is provided with a thimble through hole 32 located on the thimble counterbore 12 , and the thimble through hole 32 cooperates with the thimble 11 and allows the thimble 11 to pass through. When returning the material, the thimble 11 moves up in the cavity of the mold in the thimble sink hole 12 and the thimble through hole 32 and pushes the steel back 101 out of the cavity.

This embodiment also includes a guide post 13 arranged on the upper splint 6 and a guide sleeve 14 provided on the concave template 3. The guide post 13 and the guide sleeve 14 are located at positions that cooperate with each other to realize mold opening and mold closing guidance.

The lower mold base 1, the lower backing plate 2, and the concave template 3 are fixedly connected by a connecting piece 15 (such as a screw rod). The upper mold base 7, the upper splint 6, the rubber 5 and the stripper plate 4 are fixedly connected by the connecting piece 15, and the upper mold base 7 and the upper splint 6 are fixedly connected by the connecting piece.

As a further description of this embodiment, its working principle is now described: the front of the steel back 101 is facing downward, positioned by the positioning pin 10 and the punch 9 and installed in the mold cavity formed by the concave template 3 and the stripper plate 4; When moulding, the punch 9 moves downwards, and the mold clamping height is adjusted so that part of the sidewall of the trimming knife edge 91 stretches into the punch hole, and the punch cuts to about half of the thickness of the steel back 101. Mold opening is then ejected workpiece by thimble 11, and rubber 5 utilizes resilience to eject workpiece simultaneously. The trimming edge is used for pre-punching and deburring. This technical solution is to add a reverse trimming process before the fine-blanking die in the process of die design. Using this embodiment, the workpiece is pre-punched halfway in the thickness direction, thereby avoiding the The burrs on the front of the workpiece produced by the fine blanking process can improve product quality, avoid the increase of processes and speed up production efficiency.

For other structures of this embodiment, refer to the prior art.

The utility model is not limited to the above-mentioned embodiment, if the various changes or modifications of the utility model do not depart from the spirit and scope of the utility model, if these changes and modifications belong to the claims of the utility model and within the equivalent technical scope, Then the utility model also intends to include these modifications and variations.

Claims (7)

1. Anti-trimming pre-punching die, characterized in that: it includes a lower mold and an upper mold matched with the lower mold; the lower mold includes a concave template, and the concave template is provided with a punch hole; the upper mold is arranged above the concave template from bottom to top The stripper, the rubber on the stripper, the upper splint and the punch above the stripper, the buffer rubber is set between the upper splint and the stripper, and the upper end of the punch is set on the upper splint. The punch passes through the stripper plate, and the lower end of the punch is provided with a cutting edge; the punch hole is located at the position matched with the lower end of the punch, when the mold is closed, part of the side wall of the edge cutting edge extends into the punch hole . 2. The pre-punching die according to claim 1, characterized in that: the cross-section of the trimming edge is right-angled. 3. According to claim 1, the reverse edge trimming die is characterized in that: the lower mold comprises a lower mold base, a lower backing plate arranged on the lower mold base, and the said lower backing plate arranged on the lower backing plate from bottom to top. The concave formwork; the lower mold base, the lower backing plate and the concave formwork are fixedly connected by connecting pieces. 4. According to claim 3, the reverse edge trimming pre-punching die is characterized in that: the lower die also includes positioning pins, and the positioning pins are arranged on the concave die plate; the stripping plate is provided with positioning holes that cooperate with the positioning pins . 5. According to claim 3 or 4, the reverse trimming pre-punching die is characterized in that: the lower die also includes a thimble for returning material; There is a countersunk head and the movement of the countersunk head and the countersink hole of the thimble realizes the displacement in the countersink hole of the thimble; the concave template is provided with a through hole of the thimble on the countersink hole of the thimble, and the through hole of the thimble matches the thimble and accommodates the thimble pass. 6. The pre-punching die according to any one of claims 1 to 3, characterized in that: it also includes a guide post arranged on the upper splint and a guide sleeve provided on the concave template, the guide post and the guide sleeve in a coordinating position. 7. According to any one of claims 1 to 3, the reverse trimming pre-punching die is characterized in that: the upper die also includes an upper die seat arranged on the upper clamping plate and an upper die seat arranged on the upper die seat from bottom to top. The mold handle; the upper mold base, the upper splint, the rubber and the stripper are fixed through the connecting piece, and the upper mold base and the upper splint are fixed through the connecting piece.