Forming process of lightweight hexagonal flange face bolt

Abstract

The invention discloses a forming process of a lightweight hexagonal flange face bolt. The forming process specifically comprises the following steps: selecting a rough material with corresponding diameter to be cut according to deformation of the bolt; then extruding the rod part of the cut material and processing the billet diameter of a thread; then pre-upsetting the head of the cut material toform a cylindrical head, and punching the center at the top end of the head while pre-upsetting the head to pre-form a recess; then pre-upsetting the cylindrical head to be hexagonal and initially punching and forming a flange face of the head of the bolt; and finally, chamfering the tail end of the billet diameter of the thread and re-punching the initially formed flange face to finally form theflange face, and meanwhile, re-punching the recess preformed in the head, wherein the recessed preformed in the head is repaired and corrected. In this way, the depth of the recess is increased underthe circumstance of not affecting the bolt performance, so that a lightweight demand is met.

Description

technical field [0001] The invention relates to a bolt forming technology, in particular to a forming process of a lightweight hexagon flange bolt. Background technique [0002] At present, the forming process of hexagonal flange bolts is: material cutting, first-order extrusion thread blank diameter, second-order pre-upsetting head, third-order pre-upsetting hexagon, four-order forming head flange surface and thread blank diameter, of which , after the second-order and third-order preforming, the fluidity of the material is relatively poor during the fourth-order forming, and the depth of the cavity for head weight reduction is not enough. According to the current process, it cannot meet the requirements of new energy vehicles for lightweight fasteners. In addition, in order to save raw materials, fine materials with a diameter of 7.7mm are usually used as raw materials, and fine materials with this diameter will undergo greater cold hardening during the cold extrusion proc...

AI Technical Summary

Problems solved by technology

[0002] At present, the forming process of hexagonal flange bolts is: material cutting, first-order extrusion thread blank diameter, second-order pre-upsetting head, third-order pre-upsetting hexagon, four-order forming head flange surface and thread blank diameter, of which , after the second-order and third-order preforming, the fluidity of the material is relatively poor during the fourth-order forming, and the depth of the cavity for head weight reduction is not enough. According to the current process, it cannot meet the requirements of new energy vehicles for lightweight fasteners. In addition, in order to save raw materials, fine materials with a diameter of 7.7mm are usually used as raw materials, and fine materials with this diameter will undergo greater cold hardening during the cold extrusion process, and the strength of the material changes with the amount of deformation It will increase, thereby affecting the deformation of the material during cold extrusion, so according to the current technology, it is difficult to complete the processing of large-depth recessed bolts

Images