Method for thermally upsetting and forming flange plate bolt head

A technology of hot heading and head, applied in the direction of bolts, threaded fasteners, connecting components, etc., which can solve the problems of long cycle, slow milling speed and low benefit

Active Publication Date: 2016-04-13
AVIC STANDARD PARTS MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, the commonly used solution is to select a round bar with a diameter similar to that of the flange to turn the outer circle and mill the hexagon, or use a material with a small diameter to make the head larger, then turn the outer circle and mill the hexagon, but there are still problems. The milling speed is slow, the surface quality is not good, the cycle is long, the benefit is low, the cost is high, and it is difficult to meet the problems of mass production

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  • Method for thermally upsetting and forming flange plate bolt head

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Embodiment Construction

[0019] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0020] Such as Figure 1-2 As shown, a hexagonal flange bolt is randomly selected, and its basic data are: material 42CrMo (forging temperature range is 800-1150°C), hexagonal dimension S=12mm, rod diameter d=16mm;

[0021] First, the raw material is turned into a stepped shape;

[0022] Secondly, calculate the turning diameter φ=11.7 (S12-δ0.15-0.15=11.7) according to the size of the hexagonal opposite side and the amount of thermal expansion and contraction of the material, and turn the hexagonal material of the forming head into a small size, and then form the hexagonal small diameter part, The transition slope of the connection and the large-diameter part of the original material;

[0023] Turning the angle 5 between the transition slope 6 and the center line 7 at 30° and rounding the sharp angle 4 formed by the transition slope 6 and t...

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Abstract

The invention discloses a method for thermally upsetting and forming a flange plate bolt head. The method comprises the following steps: turning raw materials into shapes of steps; reducing the diameters of material for forming a hexagonal head to phi=S-sigma-alpha by turning, wherein S is the dimensions of opposite sides of a hexagon, sigma is thermal expansion and shrinkage amount of the material, alpha is a dislocation value of upper and lower die holders used in a thermal upsetting process, and hexagonal small-diameter parts, connected transition inclined surfaces and un-reduced large-diameter parts on raw materials are formed by reducing through turning; and finally, regulating a heating temperature of hexagonal small-diameter parts in the thermal upsetting process to be a heating temperature required for thermally upsetting to form a flange plate part on the raw materials, thereby thermally upsetting and forming the flange plate bolt head. The method has the characteristics of being high in milling speed, good in surface quality, short in period, high in benefit and low in cost, and has the characteristic that folding is not generated at junctions of a hexagonal part and a flange plate, and a product can be upset fully.

Description

technical field [0001] The invention belongs to the technical field of machinery, and in particular relates to a method for hot heading forming of a flange bolt head. Background technique [0002] At present, for the head forming of flange bolts whose hexagonal head is smaller than the diameter of the shank, because the hexagonal size is smaller than the shank diameter, and the process material selection is larger than the shank diameter, the hexagonal mold will be larger than the hexagonal part during the upsetting process. The part of the material with large sides is scraped down to produce creases. As the material at the flange expands, it will eventually fold at the junction of the hexagon and the flange, and the head hexagon may be twisted off during assembly. For this reason, the commonly used solution is to select a round bar with a diameter similar to that of the flange to turn the outer circle and mill the hexagon, or use a material with a small diameter to make ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21K1/46
CPCB21K1/46
Inventor 陈菊
Owner AVIC STANDARD PARTS MFG
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