CN102528393B - Molding process for boss of plate material - Google Patents

Abstract

The invention relates to a forming process of a plate boss, comprising the following steps: a. adding a blank to the side of the plate; b. rounding the front and back sides of the blank to form an approximately cylindrical shape; c. The cylinder is bent upward by 90°; d, the bent cylinder is subjected to cold extrusion and shaping; e, the excess blank after cold extrusion is cut and removed to obtain the final boss. The invention makes the blank into a semi-finished product on the side of the sheet, then bends it, then closes forging, and finally trims the edge to remove excess waste. The operation is convenient, the production efficiency is high, and the product can achieve good surface quality and meet customer requirements.

Description

Sheet metal boss forming process

technical field

The invention relates to a forming process, in particular to a forming process of a plate boss.

Background technique

  Cold extrusion is suitable for processing parts such as automobiles and door locks. It is characterized by fewer processes, shorter working hours, and rapid prototyping. The existing stamping boss is to use a countersunk head on the sheet to push the material upward. When stamping, the tensile stress of the sheet is too large. This process is suitable for processing materials with good ductility, relatively short bosses, and high precision. For products with low requirements, when the height of the boss that needs to be punched out is greater than the thickness of the sheet and is a high boss, cracks, midway breaks, and uneven cross-sections will occur during the molding process of the boss due to insufficient material, resulting in convexity. The table height cannot meet the customer's requirements.

Contents of the invention

In order to solve the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a sheet material boss forming process.

In order to achieve the above object, the technical solution adopted in the present invention is: a sheet material boss forming process, comprising the following steps:

a. Add a piece of blank on the side of the sheet;

b. Round the front and back sides of the blank to form an approximately cylindrical shape. In the rounding process, a stripping plate forming insert is provided in the stripping plate, and a concave formwork forming insert is provided in the concave formwork. Place the blank on the forming insert of the concave formwork, and round the corners by punching the forming insert of the stripper plate and the forming insert of the concave formwork;

c. Bend the chamfered cylinder upwards by 90°. In the 90° bending process, the upper mold base is provided with a first stripping spring, and the bottom is provided with a first stripping ejector pin. Pass through the second upper backing plate, punch fixing plate, stripping plate backing plate, and stripping plate in turn. The stripping plate is provided with a stripping plate bending block, and the concave template is provided with a lower die bending block, a bending block, and a bending block. The pressing block, the lower die seat is equipped with a stripping pressing spring, and the pressing ejector rod passes through the lower die seat and the backing plate of the die in turn to squeeze the upper die seat, and the upper die seat drives the stripping through the stripping plate backing plate The plate bending block bends the part downwards, and at the same time, the upper die base is also pressing the first stripping spring inside it, so that the first stripping spring will drive the first stripping ejector pin to squeeze downwards to complete the 90° bending;

d. The bent cylinder is subjected to cold extrusion shaping. In the cylindrical shaping process, the second stripping ejector pin is fixed through the flange under the second stripping spring, and the second stripping ejector pin passes through the first upper backing plate in turn. , The second upper backing plate, the punch fixing plate, and the stripping plate backing plate enter the stripping plate, the shaping punch is fixed on the bottom of the second upper backing plate through the punch fixing plate, and the lower die stopper is arranged in the concave template block, extruding the upper die base to drive the shaping punch to press the part downward through the punch fixing plate, and at the same time, the upper die base is also extruding the second stripping spring inside it, so that the second stripping spring will drive the second The stripping ejector pin squeezes downward;

e. Cut and remove excess billet after cold extrusion to obtain the final boss.

Preferably, the cross section of the blank in step a is square.

Preferably, the volume of the blank in step a is larger than the volume of the boss.

Preferably, the volume of the blank is 1.1-1.3 times the volume of the boss.

The present invention solves the defects existing in the background technology. The present invention makes the blank into a semi-finished product on the side of the plate, then bends it, then closes forging, and finally trims the edge to remove excess waste. The operation is convenient and the production efficiency is high, making the product Achieve good surface quality and meet customer requirements.

Description of drawings

Fig. 1 is the structural representation of boss molding die of the present invention;

Detailed ways

The present invention will now be further described in detail in conjunction with the accompanying drawings and embodiments. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present invention in a schematic manner, so it only shows the composition related to the present invention.

As shown in Figure 1, the boss forming mold is arranged in sequence from top to bottom: upper mold base 1, first upper backing plate 2, second upper backing plate 3, punch fixing plate 4, stripping plate backing plate 5 , stripper plate 6, concave die plate 7, die backing plate 8, lower mold holder 9.

In the rounding process, a stripping plate forming insert 10 is provided in the stripping plate 6, a concave formwork forming insert 11 is provided in the concave formwork 7, and the required processing is placed on the concave formwork forming insert 11. part. Through the mutual stamping of the stripping plate forming insert 10 and the concave formwork forming insert 11, the rounded corners are formed.

In the 90° bending process, the upper mold base 1 is provided with a first stripping spring 12, and the lower part is provided with a first stripping ejector pin 13, and the first stripping ejector pin 13 passes through the second upper backing plate 3, Punch fixing plate 4, stripping plate backing plate 5, stripping plate 6, stripping plate bending block 14 is arranged in stripping plate 6, lower mold bending block 15, bending pressing material are arranged in concave template 7 Block 16, the lower mold base 9 is provided with a material stripping pressing spring 18, and the pressing ejector rod 17 passes through the lower mold base 9 and the die backing plate 8 successively. When working, the upper die base 1 is extruded, and the upper die base 1 drives the stripping plate bending block 14 to bend the parts downward through the stripping plate backing plate 5, and the upper die base 1 is also extruding the first stripping plate inside it. material spring 12, so that the first stripping spring 12 will drive the first stripping push rod 13 to squeeze downward. After the bending is completed, the first stripping spring 12 and the stripping pressure spring 18 reset automatically, and the first stripping push rod 13 and the pressing push pin 17 also return to their initial positions thereupon.

In the cylinder shaping process, a second stripping ejector pin 21 is fixed below the second stripping spring 19 through a flange 20, and the second stripping ejector pin 21 passes through the first upper backing plate 2, the second upper backing plate 3, The punch fixing plate 4 and the stripping plate backing plate 5 enter the stripping plate 6, and the shaping punch 22 is fixed on the bottom of the second upper backing plate 3 through the punch fixing plate 4, and the lower mold stopper is arranged in the concave template 7 Block 23. Extrude the upper die base 1, the upper die base 1 drives the shaping punch 22 to extrude the parts downward through the punch fixing plate 4, and the upper die base 1 is also extruding the second stripping spring 19 inside it, so that the second The stripping spring 19 will drive the second stripping push rod 21 to squeeze downward. After the extrusion is completed, the second stripping spring 19 automatically resets, and the second stripping push rod 21 also returns to the initial position thereupon.

The following describes the lower boss forming process in detail, including the following steps:

a. Add a blank with a square cross-section on the side of the sheet, and the volume of the blank is 1.2 times the volume of the boss;

b. Round the front and back sides of the blank to form an approximately cylindrical shape;

c. Bend the chamfered cylinder upwards by 90°;

d. The bent cylinder is subjected to cold extrusion shaping;

e. Cut and remove excess billet after cold extrusion to obtain the final boss.

The above is inspired by the ideal embodiment of the present invention. Through the above description, relevant personnel can make various changes and modifications within the scope of not departing from the technical idea of the present invention. The technical scope of the present invention is not limited to the content in the specification, and must be determined according to the scope of the claims.

Claims (4)

1. a molding process for boss of plate material, is characterized in that, comprises the following steps:

A, increase by a compact material at plate side;

B, by the positive and negative rounding of blank, mold near cylindrical, in rounding operation, in stripper plate, being provided with stripper plate moulding inserts, in concave template, is provided with concave template moulding and insert, on concave template moulding is inserted, place described blank, change into fillet by the mutual punching press that stripper plate moulding is inserted, concave template moulding is inserted;

C, by upwards 90 ° of bendings of the cylinder after chamfering, in 90 ° of operations of bending, on upper bolster, be provided with the first de-material spring, below is provided with the first de-material push rod, the first de-material push rod is successively through the second upper padding plate, punch fixing plate, stripper plate backing plate, stripper plate, in stripper plate, be provided with stripper plate folded block, in concave template, be provided with counterdie folded block, bending binder block, in die shoe, be provided with de-material binder spring, binder push rod is successively through die shoe, die backing plate, extruding upper bolster, upper bolster drives stripper plate folded block downward bending parts by stripper plate backing plate, upper bolster also takes off material spring in first of its inside of extruding simultaneously, the such first de-material spring will drive the first de-material push rod to push downwards, complete bending in 90 °,

D, cylinder after bending carries out cold extrusion shaping, in cylinder trimming, the second de-material spring below is fixed with the second de-material push rod by flange, the second de-material push rod is successively through the first upper padding plate, the second upper padding plate, punch fixing plate, stripper plate backing plate enters in stripper plate, bottom at the second upper padding plate is fixed with shaping drift by punch fixing plate, in concave template, be provided with counterdie block, extruding upper bolster drives the downward extruder member of shaping drift by punch fixing plate, upper bolster also takes off material spring in second of its inside of extruding simultaneously, the such second de-material spring will drive the second de-material push rod to push downwards,

Unnecessary blank after e, shear removal cold extrusion, obtains final boss.

2. molding process for boss of plate material according to claim 1, is characterized in that: the cross section of blank described in step a is square.

3. molding process for boss of plate material according to claim 1, is characterized in that: the volume of blank described in step a is greater than the volume of boss.

4. molding process for boss of plate material according to claim 3, is characterized in that: the volume of described blank is 1.1-1.3 times of boss volume.

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