Production technology for engine cylinder cover bolt

A technology of engine cylinder head and production process, which is applied in the production field of bolts, can solve problems such as fracture, and achieve the effects of high creep strength and durable strength, reduced probability of fracture, and high static strength

Inactive Publication Date: 2017-02-22
WUXI MINGSHENG STRONG BLOWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main purpose of this process is to eliminate the deformation after heat treatment and ensure the dimensional accuracy of the finished car, and does not involve increasing the strength of the bolts
[0004] There is a risk of breaking the engine cylinder head bolts during use, and the breakage will cause serious consequences

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A production process for engine cylinder head bolts, comprising:

[0029] (1) cold forming;

[0030] (2) Chamfering, optional cleaning after chamfering;

[0031] (3) Heat treatment, quenching at 860±5°C, tempering at 480±5°C for 110-130 minutes;

[0032] (4) Straighter;

[0033] (5) Grinding screw blank;

[0034] (6) rolling thread;

[0035] (7) Flaw detection after cleaning;

[0036] (8) surface phosphating;

[0037] (9) Dehydrogenation, the hydrogen content in the control material is less than 0.5ppm;

[0038] (10) Coating.

[0039] The material of the engine cylinder head bolts is SCM435 steel.

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Abstract

The invention discloses a production technology for an engine cylinder cover bolt. According to the technology, through specific heat treatment and hydrogen content control, the obtained engine cylinder cover bolt meets the standard, and the breakage probability is greatly reduced.

Description

technical field [0001] The technical field of bolt production of the present invention relates in particular to a production process of engine cylinder head bolts. Background technique [0002] Cylinder head bolts work under variable stress conditions and are one of the bolts with the highest strength requirements in the engine. After the engine cylinder head bolts are assembled, the cylinder block is stressed, resulting in a certain deformation of the cylinder block under the action of static load. If the cylinder is deformed too much, it will affect the oil consumption, air leakage, friction work, cylinder wear, exhaust emission, etc. In order to meet the higher design and emission requirements, it is also becoming more important to reduce the deformation of the cylinder barrel, so the design axial force of the cylinder head bolts is higher and higher. [0003] CN 103785992 A discloses a machining process for cylinder head bolts. It includes the following steps: A) mill...

Claims

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Application Information

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IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 张达明
Owner WUXI MINGSHENG STRONG BLOWER
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