Drawing die structure based on scrap-free piercing knife

Abstract

The utility model discloses a drawing die structure based on a chip-free piercing knife, which belongs to the technical field of automobile drawing dies, and comprises an upper bottom plate and a lower bottom plate which are oppositely arranged, a drawing female die is arranged at the bottom of the upper bottom plate, the chip-free piercing knife is arranged on the drawing female die through a mounting hole, and the chip-free piercing knife is arranged on the lower bottom plate. The top of the lower bottom plate is provided with a drawing male die matched with the chip-free piercing knife through the piercing knife groove, and blank holders are arranged at the positions, on the two sides of the drawing male die, of the top of the lower bottom plate. According to the utility model, special parameter design is carried out on structural characteristics such as a puncture blade edge fillet, a puncture blade edge included angle, a puncture blade edge height, a puncture groove width, an R angle and the like, so that the drawing puncture process is optimized, the poor contact between the drawing puncture blade edge and a plate is reduced, the puncture tearing of the plate is reduced, the generation of waste scraps in the puncture process of the plate is avoided, and the production efficiency is improved. And the quality defect of crushing in drawing production is improved, and the rejection rate and the outage rate are effectively reduced.

Description

Technical Field

[0001] The utility model discloses a drawing die structure based on a non-chip-piercing knife, belonging to the technical field of automotive drawing dies. Background Art

[0002] There are many kinds of automotive panel dies, but in terms of the functions they achieve, they can generally be divided into forming dies, cutting dies, and forming and cutting compound dies. In actual production, in order to make the functions of the dies clear to the manufacturers, the naming of the dies also adopts the function description method, such as: drawing die, trimming and punching die, flanging and shaping die, etc. In the process of the process and die design of automotive body stamping parts, some special parts are often encountered, and their characteristics are usually: large size, complex drawing shape, and there are large punching areas, such as the inner door panel, side wall inner lining panel, etc.

[0003] At present, in the drawing die using a piercing knife, during the production process, there are serious waste chips in the piercing knife area, and production pressing injuries occur frequently, resulting in an increase in the production downtime rate and scrap rate, seriously affecting the part quality and production efficiency, and increasing the production manufacturing cost. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the problems of serious waste chips in the piercing knife area of the existing drawing die, frequent production pressing injuries, resulting in an increase in the production downtime rate and scrap rate, seriously affecting the part quality and production efficiency, and increasing the production manufacturing cost, and to propose a drawing die structure based on a non-chip-piercing knife.

[0005] The problems to be solved by the utility model are realized by the following technical solutions:

[0006] A drawing die structure based on a non-chip-piercing knife includes an upper bottom plate and a lower bottom plate arranged oppositely. A drawing female die is arranged at the bottom of the upper bottom plate. The drawing female die is provided with a non-chip-piercing knife through an installation hole. A drawing male die that cooperates with the non-chip-piercing knife through a piercing knife groove is arranged at the top of the lower bottom plate. Pressing rings are arranged at the top of the lower bottom plate on both sides of the drawing male die.

[0007] Preferably, a guide plate that cooperates with the inner side of the lower bottom plate is arranged on the outer side of the upper bottom plate.

[0008] Preferably, an adjusting gasket is arranged between the bottom of the non-chip-piercing knife and the bottom of the installation hole.

[0009] Preferably, a support rod cushion block is arranged at the bottom end of the pressing ring.

[0010] Preferably, the non-chip-piercing knife includes a backing plate, and a C-shaped piercing knife edge is arranged on the backing plate. The C-shaped piercing knife edge consists of a C-shaped front piercing edge and end piercing edges connected to both ends thereof.

[0011] Preferably, the edge fillet Ra of the C-shaped front piercing edge is 0.5 mm, and the edge fillet Ra of the piercing edge is 0.5 mm.

[0012] Preferably, the edge height H1 of the C-shaped front piercing edge satisfies H1 ≤ 30 mm, and both the width W1 and the width W2 of the first piercing knife are 15 mm.

[0013] Preferably, the thickness H2 of the backing plate is 25 mm, and the clearance height H3 of the root profile satisfies H3 ≤ 5 mm.

[0014] Preferably, the groove width W3 of the piercing knife groove is 22 mm, and the difference between the depth H4 and the edge height H1 is 6 mm.

[0015] Preferably, the upper fillet Rc of the piercing knife groove is 3 mm, and the lower fillet Rd of the groove is 3 mm.

[0016] The beneficial effects of the present utility model compared with the prior art are as follows:

[0017] The present utility model provides a drawing die structure based on a non-chip piercing knife. By specially designing the parameter of the edge fillet, the edge angle, the edge height, the groove width and the R angle of the piercing knife, the drawing piercing process is optimized, the bad contact between the drawing piercing edge and the sheet material is reduced, the tearing of the sheet material during piercing is alleviated, the generation of waste chips during the piercing of the sheet material is avoided, the quality defect of drawing production caused by pressing damage is improved, and the reject rate and the downtime rate are effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is an overall structure diagram of a drawing die structure based on a non-chip piercing knife of the present utility model.

[0019] Figure 2 is an isometric side view of the non-chip piercing knife in the drawing die structure based on a non-chip piercing knife of the present utility model.

[0020] Figure 3 is a cross-sectional view of the C-shaped front piercing edge of the non-chip piercing knife in the drawing die structure based on a non-chip piercing knife of the present utility model.

[0021] Figure 4 is a cross-sectional view of the piercing knife groove of the non-chip piercing knife in the drawing die structure based on a non-chip piercing knife of the present utility model.

[0022] Wherein:

[0023] 1 - upper bottom plate;

[0024] 2 - drawing concave die;

[0025] 3 - non-chip piercing knife;

[0026] 4 - Adjusting gasket;

[0027] 5 - Guide plate;

[0028] 6 - Drawing punch;

[0029] 7 - Blank holder;

[0030] 8 - Lower bottom plate;

[0031] 9 - Support rod cushion block;

[0032] 31 - Backing plate;

[0033] 32 - End piercing blade;

[0034] 33 - C - type front - side piercing blade;

[0035] 61 - Piercing knife groove. Detailed implementation manners

[0036] The following is a further description of the present utility model according to the attached Figures 1-4 drawings:

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0038] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0039] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0040] Such as Figure 1As shown in the figure, the first embodiment of the present utility model provides a drawing die structure based on a non-chip piercing knife on the basis of the prior art, including an upper bottom plate 1 and a lower bottom plate 8 arranged opposite to each other. A drawing female die 2 is installed at the bottom of the upper bottom plate 1. The non-chip piercing knife 3 is installed in the drawing female die 2 through an installation hole. An adjusting gasket 4 is installed between the bottom of the non-chip piercing knife 3 and the bottom of the installation hole. A drawing male die 6 that cooperates with the non-chip piercing knife 3 through a piercing knife groove 61 is installed at the top of the lower bottom plate 8. Blank holding rings 7 are installed at the top of the lower bottom plate 8 on both sides of the drawing male die 6.

[0041] A guide plate 5 that cooperates with the inner side of the lower bottom plate 8 is installed on the outer side of the upper bottom plate 1. A support rod cushion block 9 is provided at the bottom end of the blank holding ring 7.

[0042] Next, the non-chip piercing knife 3 will be introduced in detail. Its material is Cr12MoV, and the hardness needs to reach HRC58 - 62. As Figure 2 shown, it includes a backing plate 31, and a C-shaped piercing knife edge is provided on the backing plate 31. The C-shaped piercing knife edge consists of a C-shaped front piercing edge 33 and end piercing edges 32 connected to both ends thereof.

[0043] As Figure 3 shown, the edge fillet Ra of the C-shaped front piercing edge 33 is 0.5 mm, the edge fillet Ra is 0.5 mm, the edge height H1 ≤ 30 mm, and both the first piercing knife width W1 and the first piercing knife width W2 are 15 mm. The thickness H2 of the backing plate 31 is 25 mm, and the clearance height H3 of the root profile ≤ 5 mm.

[0044] As Figure 4 shown, the groove width W3 of the piercing knife groove 61 is 22 mm, the difference between the depth H4 and the edge height H1 is 6 mm, the upper fillet Rc of the groove is 3 mm, and the lower fillet Rd of the groove is 3 mm.

[0045] Specific working mode:

[0046] (1) When the drawing die starts to work, the blank holding ring 7 jacks up upward, higher than the drawing male die 6;

[0047] (2) Place the drawing sheet metal on the blank holding ring 7, between the blank holding ring 7 and the drawing female die 2;

[0048] (3) After the drawing forming starts, the drawing female die 2 and the blank holding ring 7 close and move downward to contact the male die 6 for forming;

[0049] (4) During the drawing forming process, the piercing knife contacts the sheet metal at a set position (H1 distance before reaching the bottom) and pierces the sheet metal;

[0050] (5) The drawing die 2 continues to move downward, and the sheet metal continues to rupture to increase the flow of the sheet metal. Due to the specific structural parameters of the piercing knife 3 and the piercing knife groove, the piercing knife 3 contacts the sheet metal simultaneously and deforms uniformly. After piercing, the sheet metal can quickly disengage from the cutting edge, avoiding the risks of sheet metal tearing and waste chips generated by the sliding of the cutting edge and the sheet metal;

[0051] (6) The drawing die 2 continues to move downward to the bottom dead center to complete the stamping forming;

[0052] (7) During the sheet metal forming process, while avoiding the generation of material chips, according to the forming state, adjusting the height of the backing plate 4 can optimize the problem of drawing cracking.

[0053] Although the embodiments of the present invention have been disclosed above, it is not limited to the applications listed in the specification and the embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily achieved. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the illustrated examples here.

Claims

1. A drawing die structure based on a chipless piercing knife, characterized in that: The invention comprises an upper base plate (1) and a lower base plate (8) which are arranged relatively to each other, wherein a drawing die (2) is arranged at the bottom of the upper base plate (1), and a chip-free piercing knife (3) is arranged at the drawing die (2) through a mounting hole, and a drawing punch (6) which cooperates with the chip-free piercing knife (3) through a piercing knife groove (61) is arranged at the top of the lower base plate (8), and pressure rings (7) are arranged at the top of the lower base plate (8) on both sides of the drawing punch (6).

2. A drawing die structure based on a chipless piercing knife according to claim 1, characterized in that: The outer side of the upper base plate (1) is provided with a guide plate (5) which cooperates with the inner side of the lower base plate (8).

3. A drawing die structure based on a chipless piercing knife according to claim 1, characterized in that: An adjustment gasket (4) is provided between the bottom of the chip-free piercing knife (3) and the bottom of the mounting hole.

4. A drawing die structure based on a chipless piercing knife according to claim 1, characterized in that: A supporting rod pad (9) is arranged at the bottom end of the pressure ring (7).

5. A drawing die structure based on a chipless piercing knife according to any one of claims 1 to 4, characterized in that: The chip-free piercing knife (3) comprises a backing plate (31), on which a C-shaped piercing blade is arranged. The C-shaped piercing blade comprises a C-shaped front piercing blade (33) and terminal piercing blades (32) connected to the two ends of the C-shaped front piercing blade (33).

6. A drawing die structure based on a chipless piercing knife according to claim 5, characterized in that: The C-shaped front piercing blade (33) has a cutting edge radius Ra of 0.5 mm. The cutting edge radius Ra of 0.5 mm.

7. A drawing die structure based on a chipless piercing knife according to claim 6, characterized in that: The blade height H1 of the C-shaped front piercing blade (33) is ≤30 mm, and the first piercing blade width W1 and the first piercing blade width W2 are both 15 mm.

8. A drawing die structure based on a chipless piercing knife according to claim 7, characterized in that: The thickness H2 of the pad (31) is 25 mm, and the open height H3 of the root profile is ≤5 mm.

9. A drawing die structure based on a chipless piercing knife according to claim 8, characterized in that: The groove width W3 of the piercing knife groove (61) is 22 mm, and the difference between the depth H4 and the blade height H1 is 6 mm.

10. A drawing die structure based on a chipless piercing knife according to claim 9, characterized in that: The upper rounded corner Rc of the piercing knife groove (61) is 3 mm, and the lower rounded corner Rd of the groove is 3 mm.

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