Cold heading moulding die for tyre bolt

Abstract

The invention discloses a cold heading moulding die for a tyre bolt, which comprises a punching die and a lower die matched with the punching die. The punching die comprises a punching shell and a punching kernel arranged at the bottom of the punching shell. The lower die comprises a die shell. The die shell is provided with a die piece and a die kernel internally. The die piece is connected on the die kernel. The other end of the die kernel is locked in the die shell through a locking sleeve. The punching kernel is provided with a bolt head cavity internally. The die piece is provided with a straight thread blank diameter cavity and an optical rod cavity that are communicated with each other internally. The die kernel is provided with a thread cavity internally. The straight thread blank diameter cavity, the optical rod cavity and the thread cavity are superposed in axis. According to the scheme of the cold heading moulding die, the tyre bolt is produced by means of cold extrusion forming to increase the strength of the bolt greatly, so that the rod of the tyre bolt is completely formed in the lower die through the structural design in the lower die so as to ensure the axiality of the steps of the tyre bolt, therefore, the tensile and torsional strength of the bolt is improved and the performance rate of the tyre bolt is guaranteed.

Description

technical field [0001] The invention relates to a mold, in particular to a cold heading forming mold for automobile tire bolts. Background technique [0002] Automobile tire bolts are an important part of automobile running gear, and its composition and structure are as attached figure 1 As shown, including the bolt head 14, the straight-grained shank 15, the polished shank 16 and the threaded shank 17, the tensile strength, torque resistance, friction coefficient, etc. directly affect the driving safety factor. At present, such automobile tire bolts are usually processed by turning, which leads to the cutting of the grain direction of the material, which cannot guarantee the coaxiality of the screw, reduces the tensile strength of the bolt, and cannot guarantee the performance level. Contents of the invention [0003] In view of the above-mentioned technical problems, the object of the present invention is to propose a tire bolt cold heading forming die that can strictly...

AI Technical Summary

Problems solved by technology

At present, this kind of automobile tire bolts is usually processed by turning, which leads to the cutting of the grain direction of the material, which cannot guarantee the coaxiality of the screw, reduces the tensile strength of the bolt, and cannot guarantee the performance level.

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