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A Technology for Preventing Roller Delayed Cracks

A process method and delay cracking technology, which is applied in the field of roller machining, can solve the problems of delayed cracks on the surface of rollers, and achieve the effects of residual stress control, crack suppression, and reduced probability of cracks

Active Publication Date: 2018-10-23
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Purpose of the invention: Aiming at the problem that the existing technology easily causes delayed cracks on the surface of the roller, the purpose of the present invention is to provide a processing method for preventing delayed cracks of the hardened steel GCr15 roller

Method used

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  • A Technology for Preventing Roller Delayed Cracks

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Embodiment Construction

[0020] Please combine figure 1 Shown, and take the diesel engine hardened steel GCr15 roller processing as an example, process according to the process of the present invention so as to introduce a preferred embodiment of the present invention.

[0021] Step 1: The same as the existing technology, that is, rough turning of the blank;

[0022] Step 2: heat treatment, the specific process includes spheroidizing annealing→quenching→ice cooling treatment→tempering→aging treatment;

[0023] Step 3: semi-finishing process, the characteristics of the grinding wheel are PA60K6V, the grinding fluid is 85% of No. 10 machine oil and 15% sulfurized fat oil with extreme pressure additives containing sulfur elements, the grinding depth is 0.015mm, and the rotation speed of the grinding wheel is 1500r / min, grinding wheel φ350mm, grinding wheel speed 27.5m / s, workpiece speed 30m / s, inject grinding fluid into the processing surface before grinding, and the flow rate is 60L / min;

[0024] Ste...

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Abstract

The invention discloses a technological method for preventing GCr15 quenched steel from producing delayed cracks. The technological method comprises the steps of rough turning, thermal treatment, semi-finishing grinding, aging treatment and accurate grinding. In order to guarantee the machining efficiency, common machining parameters are adopted in the semi-finishing grinding stage; and in order to guarantee the machining precision, small machining parameters are adopted in the accurate grinding stage, and the grinding temperature is decreased. Artificial aging treatment is added in the method, residual stress generated in the semi-finishing grinding process is released through artificial aging, the dimension is stabilized, and the probability of crack occurring is lowered.

Description

technical field [0001] The invention belongs to the technical field of roller machining, and in particular relates to a process method for preventing delayed cracks in GCr15 hardened steel. Background technique [0002] The roller is a key part of the diesel engine fuel pump and exhaust valve drive mechanism. It is the transmission body between the cam and the plunger. It bears alternating loads during work. Its surface roughness, strength, hardness, wear resistance and fatigue strength requirements Higher, the mechanical processing method of "heat treatment + grinding" is required. [0003] At present, the main processing steps of diesel engine rollers are: rough turning → heat treatment → grinding → Traful dipping treatment. After heat treatment, the roller has a high hardness of 60-63HRC. During the subsequent grinding process, the high-speed extrusion, scraping and sliding action of the abrasive grains on the surface of the workpiece makes the instantaneous temperature ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P9/00
CPCB23P9/00
Inventor 景旭文周宏根蔡羽凡袁春元王红新曹利平李国超田桂中
Owner JIANGSU UNIV OF SCI & TECH