CN219541423U

CN219541423U - Hole flanging die for rear trailing arm

Info

Publication number: CN219541423U
Application number: CN202320472985.2U
Authority: CN
Inventors: 徐国松
Original assignee: Shanghai Zhongli Automobile Parts Co ltd
Current assignee: Shanghai Zhongli Automotive Systems Group Co.,Ltd.
Priority date: 2023-03-10
Filing date: 2023-03-10
Publication date: 2023-08-18
Anticipated expiration: 2033-03-10

Abstract

The utility model discloses a rear trailing arm hole flanging die which comprises an upper die and a lower die, wherein the upper die comprises an upper die plate, an upper die base plate and a male die fixing plate which are sequentially connected and fixed; the lower die comprises a lower die core, a lower die base plate and a lower die plate which are sequentially connected and fixed, a material ejection spring is arranged on the inner side of the lower die plate, the other end of the material ejection spring penetrates through the lower die base plate to be connected with a material ejection device, the material ejection device is arranged in a hole flanging die, and the hole flanging die is fixed in the lower die core. The utility model has exquisite and reasonable structural design, and improves the product precision by utilizing the cold extrusion and hardening effect after processing of the materials.

Description

Hole flanging die for rear trailing arm

Technical Field

The utility model relates to a hole flanging die, and belongs to the technical field of stamping dies.

Background

The rear trailing arm belongs to a safety component on the automobile chassis, the thickness of the material is generally about 3.5mm, and the material of the parts is BR600/780HE or higher. Because the tensile strength and the yield strength of the material are very high, the requirement on the die is high, and particularly, the precision of the bushing mounting hole on the trailing arm is difficult to reach the precision requirement of a product through a common hole flanging process.

At present, the common product defect is that the hole flanging is not straight (as shown in fig. 1 and 2, a certain radian R can be generated at the edge of the hole flanging), so that the bushing cannot be pressed or the drawing force after the pressing cannot meet the design requirement, and the other main product defect is that after the hole flanging, the end face of the hole flanging has very opposite broken cracks, so that the safety of the whole automobile is seriously influenced, and the broken cracks are relieved by adding an additional chamfering die and manually polishing, so that the production cost is increased, and meanwhile, the rejection rate is high.

Disclosure of Invention

The technical problems to be solved by the utility model are as follows: the hole flanging die solves the problem of non-straight hole flanging and solves the problem of broken cracks on the end face after hole flanging on the premise of not increasing production procedures.

The utility model is realized by the following technical scheme:

the upper die comprises an upper die plate, an upper die base plate and a male die fixing plate which are sequentially connected and fixed, a nitrogen spring is arranged on the upper die plate, the other end of the nitrogen spring penetrates through the upper die base plate and the male die fixing plate to be connected with a material pressing plate, a hole flanging male die is arranged on the male die fixing plate, and the hole flanging male die is exposed out of the material pressing plate; the lower die comprises a lower die core, a lower die base plate and a lower die plate which are sequentially connected and fixed, a material ejection spring is arranged on the inner side of the lower die plate, the other end of the material ejection spring penetrates through the lower die base plate to be connected with a material ejection device, the material ejection device is arranged in a hole flanging die, and the hole flanging die is fixed in the lower die core.

Preferably, a variable gap exists between the hole flanging die and the hole flanging die. The surfaces of the hole flanging male die and the hole flanging female die are treated by adopting a PVD surface treatment process, so that the surface hardness and the wear resistance are improved.

More preferably, the width of the variable gap is 0.7-1 times the thickness of the product stock.

Further, the width of the variable gap gradually decreases from top to bottom, the widest part is 1 time of the thickness of the product material, and the narrowest part is 0.7 time of the thickness of the product material. During hole flanging, the part is extruded and hardened.

After the hole flanging operation is started, the hole flanging male die firstly contacts the ejector and presses the ejector into the hole flanging female die, and after the hole flanging process is finished, the ejector ejects a product out of the lower die core under the pressure of the ejector spring.

Preferably, the lower template and the upper template are respectively provided with a guide sleeve and a guide pillar which are matched with each other.

The utility model thoroughly solves the problem of unqualified bushing mounting holes caused by non-straight hole flanging by only carrying out clearance-changing treatment on the hole flanging die, and also extrudes the internal materials of the part to the hole flanging end part through a material extrusion process, thereby organizing the generation of broken cracks on the hole flanging end surface.

Drawings

FIG. 1 is a cross-sectional view of a conventional hole flanging die at a product hole flanging location;

FIG. 2 is a schematic diagram of a conventional hole flanging die in which cracking occurs at the hole flanging of the product;

FIG. 3 is a cross-sectional view of the trailing arm hole flanging die provided by the utility model;

FIG. 4 is a schematic view of a lower die;

FIG. 5 is a schematic view of an upper die;

FIG. 6 is a cross-sectional view of a hole flanging product of the present utility model;

fig. 7 is a schematic diagram of a hole flanging product according to the present utility model.

Detailed Description

In order to make the utility model more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Examples

As shown in fig. 3-5, the utility model provides a rear trailing arm hole flanging die, which comprises an upper die and a lower die. As shown in fig. 5, the upper die comprises an upper die plate 13, an upper die pad plate 12 and a male die fixing plate 2 which are sequentially connected and fixed, a nitrogen spring 1 is arranged on the upper die plate 13, the other end of the nitrogen spring 1 passes through the upper die pad plate 12 and the male die fixing plate 2 to be connected with a material pressing plate 3, a hole flanging male die 11 is arranged on the male die fixing plate 2, and the hole flanging male die 11 is exposed from the material pressing plate 3. As shown in fig. 4, the lower die comprises a lower die core 4, a lower die backing plate 5 and a lower die plate 6 which are sequentially connected and fixed, a material ejection spring 8 is arranged on the inner side of the lower die plate 6, the other end of the material ejection spring 8 penetrates through the lower die backing plate 5 and is connected with a material ejector 7, the material ejector 7 is arranged in a hole flanging die 9, and the hole flanging die 9 is fixed in the lower die core 4. The lower template 6 and the upper template 13 are respectively provided with a guide sleeve 14 and a guide post 15 which are matched with each other.

After the hole flanging operation is started, the hole flanging male die 11 firstly contacts the ejector 7 and presses the ejector 7 in the hole flanging female die 9, and after the hole flanging process is finished, the ejector 7 ejects a product out of the hole flanging female die 9 under the pressure of the ejector spring 8, so that the product is conveniently taken out.

A variable gap exists between the hole flanging die 9 and the hole flanging die 11. The width of the variable gap gradually decreases from top to bottom, the widest part is 1 time of the product material thickness t, and the narrowest part is 0.7 time of the product material thickness t. During hole flanging, the part is extruded and hardened. When in extrusion, the internal material is forced to flow to the top end of the hole flanging, so that redundant material is provided, and the generation of broken cracks is prevented; the inner side surface of the hole flanging is flat and clean after the material is hardened, the precision is high, and the requirement of bushing press fitting is met. The resulting product is shown in FIGS. 6 and 7.

The surfaces of the hole flanging male die 11 and the hole flanging female die 9 are treated by adopting a PVD surface treatment process, so that the surface hardness and the wear resistance are improved.

Claims

1. The rear trailing arm hole flanging die comprises an upper die and a lower die and is characterized in that the upper die comprises an upper die plate (13), an upper die cushion plate (12) and a male die fixing plate (2) which are sequentially connected and fixed, a nitrogen spring (1) is arranged on the upper die plate (13), the other end of the nitrogen spring (1) penetrates through the upper die cushion plate (12) and the male die fixing plate (2) to be connected with a material pressing plate (3), a hole flanging male die (11) is arranged on the male die fixing plate (2), and the hole flanging male die (11) is exposed out of the material pressing plate (3); the lower die comprises a lower die core (4), a lower die cushion plate (5) and a lower die plate (6) which are sequentially connected and fixed, a material ejection spring (8) is arranged on the inner side of the lower die plate (6), the other end of the material ejection spring (8) penetrates through the lower die cushion plate (5) to be connected with a material ejection device (7), the material ejection device (7) is arranged in a hole flanging die (9), and the hole flanging die (9) is fixed in the lower die core (4).

2. The trailing arm hole flanging die as claimed in claim 1, characterized in that a variable gap is present between the hole flanging die (9) and the hole flanging punch (11).

3. The trailing arm hole flanging die of claim 2, wherein the variable gap has a width that is 0.7-1 times the product thickness (t).

4. The trailing arm hole flanging die of claim 3, wherein the width of the variable gap gradually decreases from top to bottom, the widest point being 1 times the product thickness (t), and the narrowest point being 0.7 times the product thickness (t).

5. The rear trailing arm hole flanging die as claimed in claim 1, wherein the lower die plate (6) and the upper die plate (13) are respectively provided with a guide sleeve (14) and a guide post (15) which are matched with each other.