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Brazing tool internal hole surface treating method

A technology of surface treatment and drilling tools, which is applied in the field of surface treatment of the inner hole of the drilling tool, can solve the problem that the inner hole cannot be strengthened, and achieve the effect of reducing fatigue fracture and improving service life

Inactive Publication Date: 2004-06-30
SHANGHAI MEISHAN TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitation of the inner hole size of the drilling tool, the inner hole cannot be surface strengthened

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0008] A surface treatment method for the inner hole of a drilling tool. The specific method is: before the heat treatment after the drilling tool is machined, use a steel ball of HRC60 that has a certain amount of interference with the inner hole size of the drilling tool, and start from the drilling tool with lubricating oil. Squeeze in one end of the inner hole of the tool and extrude from the other end, repeating 4 times; Squeeze in one end of the inner hole of the drill and extrude from the other end, repeating 4 times.

[0009] Through the above treatment, the surface of the inner hole of the drilling tool will produce a small amount of plastic deformation, reduce the tool marks produced by drilling, improve the surface finish of the inner hole, thereby reducing the source of crack initiation; at the same time, the surface of the inner hole of the drilling tool will be in a state of high compressive stress, thereby Reduce the crack growth rate and increase the service li...

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PUM

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Abstract

The invention relates to an inner aperture surface strengthening technique, especially a rock drill's inner aperture surface processing method. The technical steps as follows: after the rock drill is finished and before heat treatment, make a steel ball HRC50-61 with a certain over surplus quantity relative to the inner aperture size of the rock drill squeeze in from one end of the lubricant inner aperture and out from another end, and repeatedly perform for above 3 times to make the inner aperture surface generate trace plastic deformation. After heat treatment, make a heavyweight alloy ball HRA 80-91 with a certain over surplus quantity to squeeze in from one end and out from another one, repeatedly perform for above 3 times to make the inner aperture surface in high pressure stress state.

Description

(1) Technical field: [0001] The invention relates to an inner hole surface strengthening technology, in particular to a method for treating the inner hole surface of a drilling tool. (two), background technology: [0002] The service conditions of all kinds of drilling tools for rock drilling and engineering are very harsh, and the drilling tools are subjected to complex bending, torsion, tensile and other loads in service, so abnormal fatigue fractures are prone to occur. The outer surface shot peening treatment is often used in the manufacture of drilling tools to increase the compressive stress on the outer surface of the drilling tool, reduce the source of crack initiation, reduce the speed of crack propagation, and improve the fatigue life of the drilling tool. However, due to the limitation of the inner hole size of the drilling tool, the inner hole cannot be surface strengthened. During the service of drilling tools, the fatigue fracture of drilling tools often occur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D7/04C21D9/00
Inventor 倪明郝克绍
Owner SHANGHAI MEISHAN TECH DEV