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Alloy steel bearing block machining method beneficial to reduction of heat treatment induced cracks

A processing method and alloy steel technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve problems such as easy wear, affecting the precision of interference fit between the center hole and bearings, and unfavorable service life of parts such as bearings of rotating equipment. Achieve good impact resistance and good cooling effect of thermal stress residue

Inactive Publication Date: 2014-12-10
CHENGDU HENGTONG ZHAOYE PRECISION MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the boring tool in the above-mentioned prior art is easy to wear during the cutting process, the wear amount of the hole with a boring tool processing length of 100mm may reach 0.1mm, which seriously affects the interference fit accuracy of the obtained center hole and the bearing, which is not conducive to The service life of parts such as rotating equipment bearings, and the impact resistance of the bearing seat in the prior art need to be further improved. The present invention provides a processing method for alloy steel bearing seats that is beneficial to reducing heat treatment cracks

Method used

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Embodiment 1

[0020] The invention discloses a method for processing alloy steel bearing housings beneficial to reducing heat treatment cracks, which is used for manufacturing alloy steel bearing housings containing Cr, Ni and Mo elements. The processing method includes the following steps in sequence: casting, machining datum surface, hole machining, Making connecting bolt holes, a heat treatment step is also arranged between the casting and machining datum steps;

[0021] The heat treatment step includes quenching and tempering, the quenching is to heat the forging obtained by forging to 975-1050 °C and keep it for not less than 6 hours and then cool it, and the tempering is to heat the quenched blank to 580-630 °C And keep warm for not less than 8 hours and then oil-cool;

[0022] In the quenching process, the temperature rise of the blank before reaching 975-1050°C is a staged temperature rise, that is, at least a heat preservation stage with a duration of not less than 1h is set during...

Embodiment 2

[0027] This embodiment is further limited on the basis of embodiment 1: in order to benefit the quenching efficiency and evenly share the thermal stress accumulation rate in the heating process, there is one heat preservation stage, and the heat preservation temperature in the heat preservation stage is 550-600°C.

[0028] In order to further optimize the tempering effect, the billet is cooled to 200-250° C. in the tempering oil cooler and kept for not less than 8 hours.

[0029] In order to facilitate mechanical processing, there are marking steps between the casting and processing datum plane, machining datum plane and hole processing, hole processing and making connecting bolt holes.

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Abstract

The invention discloses an alloy steel bearing block machining method beneficial to the reduction of heat treatment induced cracks and used for manufacturing alloy steel bearing blocks containing Cr, Ni and Mo elements. The machining method comprises the following steps of casting, heat treatment, reference plane machining, hole machining and connecting bolt hole making which are sequentially carried out, wherein the heat treatment process comprises the steps of quenching and tempering, a way of heating in stages is adopted in the quenching process, and the cooling step in the quenching process is realized in a way of air cooling after furnace cooling. The machining method is simple in process route and beneficial to quality improvement of the alloy steel bearing block and increment of machining efficiency.

Description

technical field [0001] The invention relates to the field of mechanical processing and manufacturing technology, in particular to a processing method of an alloy steel bearing seat which is beneficial to reducing heat treatment cracks. Background technique [0002] Bearing housings in the prior art are widely used in rotating equipment as supporting components for bearings. The bearing seat is provided with concentric circular holes, and the concentric circular holes are the installation stations of the bearings. In the prior art, in rotating equipment requiring high rotation precision, heavy load or high speed, it is often necessary to install two or more bearings in the same bearing seat to provide two or more support points for the rotating shaft. Such as the screw pump bearing box with a long drive shaft, the fan spindle bearing box of a large cooling tower, the roller bearing box of a plate rolling machine, etc. [0003] In the prior art, the central round hole on the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/00C21D1/18C21D9/00B23P15/00
Inventor 吴光武
Owner CHENGDU HENGTONG ZHAOYE PRECISION MACHINERY
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