Near-net forming method of high-strength internal hexagon bored bolt

Abstract

The invention discloses a near-net forming method of a high-strength internal hexagon bored bolt. The method includes: firstly, feeding a pipe; secondly, cold-extruding, machining, thermally annealing, surface-treating, and lubricating; thirdly, placing a treated hollow blank into a cavity of a forming die of a forming tool for a high-strength internal hexagon bored bolt, forming an internal hexagon bore and a boss on the bolt, smoothly ejecting an extruded part out of the die; and fourthly, cutting ends and threads on the near-net-shaped extruded part to obtain a standard internal hexagon bored bolt. The method is convenient and simple to operate and high in production efficiency, has fewer machining procedures compared with those of the traditional method, has effectively lowered production cost, and is suitable for batch production.

Description

technical field

[0001] The invention belongs to the plastic cold extrusion processing and forming technology of metal materials, that is, the near-net forming technology, in particular to a near-net forming method of high-strength internal hexagonal through-hole bolts. Background technique

[0002] The hexagon socket bolts in the end couplings on tracked vehicles are one of the important parts of this type of vehicle. Traditionally, solid structures are used. The traditional solid structure has a long production cycle, high manual labor intensity, and serious waste of materials, making it difficult to meet the needs of mass production. The current development trend is that the mobility of the vehicle must be reduced in order to improve its maneuverability. However, the amount of hexagon socket head bolts in the whole vehicle is quite large. If the hexagon socket head bolts are changed to hexagon socket through hole structures, the demand for vehicle weight reduction can be...

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