Hollow bolt and machining process thereof

A technology of hollow bolts and processing technology, applied in the direction of screws, threaded fasteners, connecting components, etc., can solve the problems of short service life, poor bolt performance, low precision, etc., to improve fatigue strength and torsional strength, improve internal and Good surface quality and surface finish

Inactive Publication Date: 2019-05-24
浙江国盛汽车科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing hollow bolts have the problem that the oil passing through the holes is not smooth, and the hollow bolts produced have low precision, poor finish, and low automation. In addition, during the thread rolling process, the bolts are often deformed, and the final processed bolts The performance is poor, and the hardness and strength cannot meet the requirements of use, resulting in a short service life and easy damage

Method used

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  • Hollow bolt and machining process thereof

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Embodiment Construction

[0025] Such as figure 1 As shown, a hollow bolt processing technology, the specific steps are as follows: (1) Raw material preparation: carry out spheroidizing annealing on the round steel twice, the spheroidizing annealing temperature is 740 ℃, and the holding time is 32 hours; (2) cooling Drawing: The raw material is drawn twice at room temperature, the first drawing is to φ12.15mm, the second drawing is to φ11.6mm, and the material hardness is controlled to be less than or equal to 80HRB; (3) Cold heading: The head of the bolt is formed through a special cold heading machine with six membranes and multi-station cold heading, and the blank diameter is φ10.87mm~10.90mm, the verticality of the support surface is 0.1mm, the inner hole diameter is φ6.6mm~6.7mm, and the horizontal direction The taper is not greater than 0.15mm, and the production efficiency can reach 300 pieces / min; (4) Automatic instrument: adopt lathe CNC 360° indexing, 3 holes are evenly distributed at 120°, a...

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Abstract

The invention discloses a hollow bolt machining process. The hollow bolt machining process comprises the following steps of (1), preparing raw material; (2), cold drawing; (3), cold heading; (4), automatic drilling; (5), cleaning; (6) thread rolling; and (7), heat treatment (tempering). The machining process has the advantages that surface smoothness of material is good, the automatic machining production efficiency is high, the strength of a thread rolling surface is good, and the strength of a finished product is high. Meanwhile, the hollow bolt comprises a screw cap and a screw rod, one side of the screw cap is provided with a round concave surface, a screw rod is integrally arranged at the center of the other side of the screw cap, a threaded part is arranged at one end of the screw rod, three round holes are annularly arrayed on the side, close to the screw cap, of the screw rod, and an inner hole is formed in one side of the screw rod. The hollow bolt has the advantages of beinggood in using effect and good in oil passing effect.

Description

technical field [0001] The invention relates to a hollow bolt and its processing technology. Background technique [0002] Hollow bolts are also called oil-through bolts, and the bolt sealing form is hinged. It is mostly used for oil pipeline and water pipeline connection seal. Widely used in engine oil supply systems of automobiles, ships, machinery, etc., and hydraulic piping systems. [0003] The existing hollow bolts have the problem that the oil passing through the holes is not smooth, and the hollow bolts produced have low precision, poor finish, and low automation. In addition, during the thread rolling process, the bolts are often deformed, and the final processed bolts The performance is poor, and the hardness and strength cannot meet the requirements of use, resulting in a short service life and easy damage. Contents of the invention [0004] In order to solve the above problems, the object of the present invention is to provide a hollow bolt with good use eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00F16B35/00
Inventor 涂哲豪
Owner 浙江国盛汽车科技股份有限公司
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