CN219443078U

CN219443078U - Round tube coreless punching die

Info

Publication number: CN219443078U
Application number: CN202320456202.1U
Authority: CN
Inventors: 徐国松
Original assignee: Shanghai Zhongli Automobile Parts Co ltd
Current assignee: Shanghai Zhongli Automobile Parts Co ltd
Priority date: 2023-03-10
Filing date: 2023-03-10
Publication date: 2023-08-01
Anticipated expiration: 2033-03-10

Abstract

The utility model discloses a coreless punching die for round pipes, which comprises an upper die plate and a lower die plate and is characterized in that a punch is arranged at the inner side of the upper die plate relative to a punching position of a pipe fitting, and the punch is fixed on the upper die plate through a punch fixing plate; the inner side of the lower die plate is provided with a lower die core, the lower die core is provided with a material pressing plate, a die cavity is formed between the lower die core and the material pressing plate, and the material pressing plate is connected with the upper die plate through a nitrogen spring; the opposite sides of the lower mold core and the pressing plate are respectively provided with a lower mold blade part insert and an upper mold blade part insert; when the inner guide sleeve and the inner guide post relatively move or the outer guide sleeve and the outer guide post relatively move, the punch penetrates into the upper die blade part insert or the lower die blade part insert. The utility model has reasonable structural design and simple operation, when a worker operates, a product is placed on the lower mold core, then the upper slide block of the press is started to move downwards to perform punching operation, the finished product is taken out from the lower mold core after the press rises to the upper dead point, and the waste automatically falls into the waste hole of the machine tool.

Description

Round tube coreless punching die

Technical Field

The utility model relates to a blanking die, and belongs to the technical field of round tube blanking dies.

Background

When the round pipe fittings are punched, a punching die with a core and a core rod is mostly adopted, and the product requirements can be generally met. However, when the pipe is bent to some extent or the length of the pipe is excessively long, the core rod cannot be placed inside. In this case, the coreless die cutting may cause abnormal and huge burrs of the cut, and the surface of the cut portion may be deformed by collapse, so that the product may not be used. The notch part of the pipe fitting (shown in fig. 1-3) is mostly manufactured by three-dimensional laser, and the production cost of the pipe fitting is higher than that of a common stamping part due to the characteristics of low production efficiency and high cost of the three-dimensional laser. With the continuous development of new energy vehicles, more and more circular tube structural members are used on automobile chassis, and a production mode with lower production cost is urgently required to be found.

Disclosure of Invention

The technical problems to be solved by the utility model are as follows: the round tube punching die without three-dimensional laser cutting can meet the requirement of mass production and can also ensure the product precision.

In order to solve the technical problems, the utility model is realized by the following technical scheme:

the coreless punching die for the round pipe comprises an upper die plate and a lower die plate and is characterized in that a punch is arranged at a punching position of the inner side of the upper die plate relative to the pipe fitting and is fixed on the upper die plate through a punch fixing plate; the inner side of the lower die plate is provided with a lower die core, the lower die core is provided with a material pressing plate, a die cavity is formed between the lower die core and the material pressing plate, and the material pressing plate is connected with the upper die plate through a nitrogen spring; the opposite sides of the lower mold core and the pressing plate are respectively provided with a lower mold blade part insert and an upper mold blade part insert; when the inner guide sleeve and the inner guide post relatively move or the outer guide sleeve and the outer guide post relatively move, the punch penetrates into the upper die blade part insert or the lower die blade part insert.

Preferably, the punch is made of tungsten steel, and the angle of the cutting edge part of the punch is not more than 30 degrees.

Preferably, a variable gap is formed between the upper die blade insert and the pipe, and the width of the variable gap is 0-0.5 mm.

Preferably, the upper template and the lower template are respectively connected with an outer guide post and an outer guide sleeve which are matched with each other, and the outer guide sleeve is fixedly connected with the lower template through an outer guide sleeve fixing plate.

Preferably, an inner guide post is arranged on the inner side of the upper die plate, and the inner guide post penetrates through the punch fixing plate to be matched with an inner guide sleeve in the material pressing plate.

The utility model solves the problem that the product requirement can be met only by using the common stamping technology to replace three-dimensional laser cutting, improves the production efficiency and reduces the production cost. The structure design is compact and reasonable, the repeated positioning precision of parts is high, the nitrogen spring is used as a pressure source to ensure enough pressing force, and the punch head made of tungsten steel can meet the requirement of mass production.

Drawings

FIG. 1 is a front view of a tube in a curved shape;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a side view of FIG. 1;

fig. 4 is a schematic structural view of a die-cut die for coreless round tubes according to the present utility model;

FIG. 5 is a cross-sectional view of an upper die blade insert and a lower die blade insert;

fig. 6 is a schematic view of a punch.

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. 4-6, the utility model provides a coreless punching die for a circular tube, which comprises an upper die plate 8 and a lower die plate 4, wherein a punch 12 is arranged at a punching position of the inner side of the upper die plate 8 relative to a pipe fitting, and the punch 12 is fixed on the upper die plate 8 through a punch fixing plate 9; the inner side of the lower die plate 4 is provided with a lower die core 3, the lower die core 3 is provided with a material pressing plate 13, a die cavity is formed between the lower die core 3 and the material pressing plate 13, and the material pressing plate 13 is connected with the upper die plate 8 through a nitrogen spring 11; the opposite sides of the lower mold core 3 and the pressing plate 13 are respectively provided with a lower mold blade part insert 2 and an upper mold blade part insert 14; when the inner guide sleeve 15 moves relative to the inner guide post 10 or the outer guide sleeve 6 moves relative to the outer guide post 7, the punch 12 is arranged in the upper die blade insert 14 or the lower die blade insert 2 in a penetrating way. The punch 12 is made of tungsten steel, and the angle a of the cutting edge part is not more than 30 degrees. A variable gap is provided between the upper die blade insert 14 and the pipe member 1, and the width t of the variable gap is 0 to 0.5mm.

The upper template 8 and the lower template 4 are respectively connected with an outer guide post 7 and an outer guide sleeve 6 which are matched with each other, and the outer guide sleeve 6 is fixedly connected with the lower template 4 through an outer guide sleeve fixing plate 5. An inner guide post 10 is arranged on the inner side of the upper die plate 8, and the inner guide post 10 penetrates through the punch fixing plate 9 to be matched with an inner guide sleeve 15 in the material pressing plate 13.

When the die performs blanking, the upper die plate 8 drives the material pressing plate 13, the upper die blade part insert 14 is forced to press the pipe fitting 1 under the action of the nitrogen springs 11, the pipe fitting 1 is fixed on the lower die core 3 with the lower die blade part insert 2, and then the punch 12 with sharp corners is used for performing punching operation on the pipe fitting 1.

No mandrel is provided in the tube 1, and the profile of the upper die blade insert 14 is not a standard circle, but a variable gap t of 0-0.5mm is provided between the upper die blade insert and the tube 1, so as to strongly press the tube 1 and apply a reaction force against collapse to the tube 1 (see fig. 5).

The punch 12 is made of tungsten steel, so that the service life can be prolonged, the angle a of the end cutting edge part of the punch 12 is less than or equal to 30, and the collapse deformation of the pipe fitting 1 can be reduced to the greatest extent in the punching process (see figure 6).

The inner guide pillar group and the outer guide pillar group can improve the positioning precision and the blanking precision of products and effectively prevent burrs from being generated.

Claims

1. The coreless punching die for the round pipe comprises an upper die plate (8) and a lower die plate (4) and is characterized in that a punch (12) is arranged at a punching position of the inner side of the upper die plate (8) relative to a pipe fitting, and the punch (12) is fixed on the upper die plate (8) through a punch fixing plate (9); the inner side of the lower die plate (4) is provided with a lower die core (3), the lower die core (3) is provided with a material pressing plate (13), a die cavity is formed between the lower die core (3) and the material pressing plate (13), and the material pressing plate (13) is connected with the upper die plate (8) through a nitrogen spring (11); the opposite sides of the lower mold core (3) and the pressing plate (13) are respectively provided with a lower mold blade part insert (2) and an upper mold blade part insert (14); when the inner guide sleeve (15) and the inner guide post (10) move relatively or the outer guide sleeve (6) and the outer guide post (7) move relatively, the punch (12) is arranged in the upper die blade insert (14) or the lower die blade insert (2) in a penetrating mode.

2. The die set for coreless cutting round tubes as claimed in claim 1, wherein the punch (12) is made of tungsten steel, and the angle (a) of the cutting edge portion is not more than 30 °.

3. The die set for coreless cutting round tubes according to claim 1, wherein a variable gap is present between the upper die blade insert (14) and the tube member, the variable gap having a width (t) of 0-0.5 mm.

4. The round tube coreless punching die as claimed in claim 1, wherein the upper die plate (8) and the lower die plate (4) are respectively connected with an outer guide post (7) and an outer guide sleeve (6) which are matched with each other, and the outer guide sleeve (6) is fixedly connected with the lower die plate (4) through an outer guide sleeve fixing plate (5).

5. The die-cutting die for round tubes without cores according to claim 1, wherein an inner guide pillar (10) is arranged on the inner side of the upper die plate (8), and the inner guide pillar (10) passes through the punch fixing plate (9) to be matched with an inner guide sleeve (15) in the pressing plate (13).