Punching bar and die for secondary preformation of inner hexagonal cylinder head and forming method

A forming method and pre-forming technology, applied in the direction of manufacturing tools, bolts, connecting components, etc., can solve the problems of low service life of hexagon socket punches, large deformation of the head, affecting the stability of the production process, etc., and reduce the operation time. The effect of replacement time, increased service life, and reduced mold cost

Inactive Publication Date: 2018-09-04
LENGSHUIJIANG TIANBAO IND
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] At present, the secondary necking process is generally used. The main advantages of this process are that the head height is full, the deformation of the head rod is uniform, and the pr

Method used

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  • Punching bar and die for secondary preformation of inner hexagonal cylinder head and forming method
  • Punching bar and die for secondary preformation of inner hexagonal cylinder head and forming method
  • Punching bar and die for secondary preformation of inner hexagonal cylinder head and forming method

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings and examples.

[0020] The embodiment of the present invention is mainly aimed at the production of hexagon socket head cap screws by multi-station cold heading of M5~M24, and is mainly used for the production of general-purpose hexagon socket head cap screw basic parts by multi-station cold heading.

[0021] In this embodiment, the forming method of the hexagonal cylindrical head includes a first preforming step, a second preforming step, and an extrusion forming step. figure 1 Shown is the diagram of the deformation state of the workpiece in the forming method. From top to bottom, it is the first, second, third, and fourth diagrams, which respectively represent the state of the workpiece in different steps.

[0022] The first preforming step consists of cutting the disk raw material (such as figure 1 In the first picture), the pinch is sent to the first preforming die ...

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Abstract

The invention discloses a punching bar for secondary preformation of an inner hexagonal cylinder head. A circular truncated cone-shaped protrusion part is arranged in the middle of the head of the punching bar, and an inverted circular truncated cone is arranged at the top of the protrusion part. The invention further discloses a die for secondary preformation of the inner hexagonal cylinder headand a forming method of the inner hexagonal cylinder head. The punching bar for secondary preformation is structurally modified, so that when the inner hexagonal punching bar makes contact with a workpiece, positioning is accurate, center deviation is avoided, the situation that the inner hexagonal punching bar is broken due to eccentric force generated by the punching bar is avoided, and thus, the service life of the inner hexagonal punching bar is prolonged; and the die cost is reduced, the operation and replacement time is shortened, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the forming technology of a hexagon socket head screw, in particular to a second preforming punch, a mold and a forming method of a hexagon socket head. Background technique [0002] The forming process and molds of hexagon socket head screws are mostly used in automatic cold heading machines such as one die and two punches, two dies and three punches, and three dies and three punches. [0003] At present, the secondary necking process is generally used. The main advantages of this process are that the head height is full, the deformation of the head rod is uniform, and the product has few cracks, but the deformation degree of the product head is large, and the service life of the inner hexagonal punch is low, which affects the production process. process stability. Contents of the invention [0004] The invention provides a hexagonal cylindrical head second preforming punch, a mold and a forming method which can increase th...

Claims

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Application Information

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IPC IPC(8): B21J13/02B21K1/50
Inventor 杨波姜爱民
Owner LENGSHUIJIANG TIANBAO IND
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