High wear-resisting oil pressure jacking rod machining process

Abstract

The invention discloses a high wear-resisting oil pressure jacking rod machining process. The high wear-resisting oil pressure jacking rod machining process comprises the following steps of SKD61 rawmaterial preparing, center oil hole drilling, outline and auxiliary thread CNC rough lathing, heat treating, jacking center jig tightening and equipping, outer circle rough grinding, seal ring grooveCNC finish lathing, nitrocarburizing, outer circle and end surface finish grinding, jacking center jig dismantling and flat grinding to control the total length, inner hole CNC finish lathing (to remove the auxiliary thread), outer circle polishing and ultrafine MAX coating. According to the high wear-resisting oil pressure jacking rod machining process, SKD61 raw materials are selected and used as base materials to perform machining, by means of 'overall hard quenching and nitrocarburizing' treatment, a jacking rod is made to have the characteristics of outer hardness and inner toughness to achieve the requirements for jacking rod wear resistance and impact resistance, and by means of configuration of jacking center auxiliary datum, a jacking rod outer circle and a mold installation surface are machined in place in a same work procedure, so that the fact that the materials can also meet the jacking rod machining precision requirements even if large deformation is generated after heattreatment is guaranteed.

Description

technical field [0001] The invention relates to a processing technology of a high wear-resistant hydraulic ejector rod, belonging to the technical field of precision workpiece processing technology. Background technique [0002] As an important part of the hydraulic mold clamping mechanism, the hydraulic ejector rod mainly plays the role of force transmission in the axial mold opening and closing movement of the capping machine mold; the single mold cavity is independently controlled, and the upper mold (punch mold) of the mold Installed at one end of the hydraulic ejector pin, the assembly is evenly arranged in a circular shape in the compression molding mechanism according to the number of cavities, and the precision of the ejector pin directly affects the accuracy of mold clamping. [0003] The hydraulic ejector pin is traditionally made of SKH51 material through the process of "raw raw material roughening → overall hardening → finishing" to ensure the hardness. The eject...

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Problems solved by technology

[0004] Disadvantages of this processing technology: ①. After the overall hardening of SKH51 material, the internal and surface hardness of the material reaches HRC60±2, which is hard on the outside and brittle on the inside, and the processing cost is high. Although the wear resistance is excellent, it may Breakage due to frequent punching, resulting in damage to the mold and equipment; ②. After the ejector pin is fixed horizontally, the side of the grinding wheel is finely trimmed on the mold mounting surface, which may be due to clamping errors and friction vibration during side repair, resulting in the relative top of the mold mounting surface When the rod axis is tilted, it is difficult to control the vertical precision of the mounting surface

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