Machining technology capable of increasing compressive stress depth of surface of rolling wheel

Abstract

The invention relates to a processing technology capable of increasing compressive stress depth of the surface of a rolling wheel. The machining technology comprises the following steps of rough turning, heat treatment, excircle rough grinding, shot blasting, and two-end-face grinding, wherein fine grinding on an excircle and a middle hole is conducted by using a double-disc grinder to machine theexcircle and the middle hole into the size of a finished product in the two-end-face grinding step. Compared with a conventional machining technology of the rolling wheel, a shot-throwing process isadded after rough grinding on the excircle is conducted, steel shots with a diameter of 0.5mm are used to continuously impacts the surface of the rolling wheel in a shot blasting machine to greatly enhance the surface compressive stress of the rolling wheel, a compressive stress hardened layer with sufficient depth is obtained, meanwhile, too many hardened layers cannot be consumed in subsequent machining, and the abrasion resistance of the rolling wheel is greatly enhanced.

Description

technical field [0001] The invention belongs to the technical field of roller machining, and in particular relates to a process method for increasing the depth of compressive stress on the surface of a roller. Background technique [0002] The tappet part is one of the key components in the high-pressure common rail fuel injection pump, and the roller, as the part with the highest working frequency, often has the problem of insufficient surface compressive stress depth after conventional processing, and the surface quality of the roller It directly affects whether the component is qualified or not. Therefore, in the actual work of the common rail pump, once the strength of the roller surface is insufficient, pitting is easy to occur, which affects the normal operation of the common rail oil pump, and may seriously cause damage to the pump. [0003] At present, the finishing of roller parts is mostly limited to conventional processes such as conventional heat treatment, grind...

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Problems solved by technology

[0002] The tappet part is one of the key components in the high-pressure common rail fuel injection pump, and the roller, as the part with the highest working frequency, often has the problem of insufficient surface compressive stress depth after conventional processing, and the surface quality of the roller It directly affects whether the component is qualified or not. Therefore, in the actual work of the common rail pump, once the strength of the roller surface is insufficient, pitting will easily occur, which will affect the normal operation of the common rail oil pump, and may seriously cause damage to the pump.

[0003] At present, the finishing of roller parts is mostly limited to conventional processes such as conventional heat treatment, grinding, rolling and polishing, such as rough turning→heat treatment→rough grinding of the outer circle→grinding both ends→fine grinding of the outer circle→grinding the center hole, etc. After this Although the rollers can be guaranteed to achieve sufficient dimensional accuracy and high roughness after processing, and the surface compressive stress can reach -500Mpa, the depth of compressive stress is too shallow to meet the long-term high-stress working state or in different media. Performance requirements of working rollers

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