Powder injection molding process

Abstract

The invention relates to a powder injection molding process. The method includes steps of a) mixing, b) injection molding, c) degreasing and sintering, d) quenching and e) subzero processing. In the step a), metal powder materials, anti-friction metallic elements and organic binding materials are fed into an internal mixer and, under an airtight environment and at the temperature of 180 degrees, are stirred to be formed into particles. In the step b), a mold with a hole pattern and a thread pattern is adopted, and the particles are injected into an injection opening of the mold by an injection molding machine. In the step c), a processed semi-product is put into a sintering furnace to be subjected to degreasing and sintering. In the step d), the processed semi-product is put into a vacuum furnace to be subjected to quenching. In the step e), the processed semi-product is subjected to subzero processing. The powder injection molding process is adopted to produce guide rails and sliding blocks to lead to fewer processes such as drilling holes and tapping, thus the process is simple and environment-friendly, production cycle is shortened, and production speed is increased.

Description

technical field [0001] The invention relates to a processing technology, in particular to a powder injection molding technology. Background technique [0002] The structure of the linear guide rail has two basic components, one as a guide is a fixed component (rail), and the other is a moving component (slider). The guide rail as a guide is hardened steel, which is placed on the installation plane after fine grinding. The geometry of the cross section is more complicated, because grooves need to be machined on the guide rail to facilitate the movement of the sliding assembly. The slider wraps the top and two sides of the guide rail. The linear guide uses rolling steel balls as the power transmission interface between the guide rail and the slider. , because the rolling steel ball is suitable for high-speed motion with small friction coefficient and high sensitivity, which meets the working requirements of the moving parts, and can perform infinite rolling cycle motion, and t...

AI Technical Summary

Problems solved by technology

[0005] First, the machining process, the specific process is as follows: metal material - drawing forming - perforation - wire cutting - drilling large holes (diameter 1, 1.4, 1.8, 2.4, etc.) - tapping (M1.4, M1.6, M2 , M3, etc.) - chamfering - deburring - quenching - fine grinding - finished product; the machining process has the following disadvantages: many production processes, long time consumption, large tool wear, due to many production processes, resulting in high material waste rate, The scrap rate of finished products is high, resulting in higher production costs;

[0006] Second, precision casting process: precision casting rough products - rough grinding - perforation - drilling large holes (diameters of 1, 1.4, 1.8, 2.4, etc.) - tapping (M1.4, M1.6, M2, M3, etc.) - Chamfering—deburring—quenching—fine grinding—finished product; the disadvantages of this precision casting machining process: the material process is not environmentally friendly, the material precision is poor, the processing process increases, and the tool consumption is large. Due to the many production processes, the material is easy to foam and crack. and other unqualified defects, resulting in a high scrap rate, resulting in a large waste of materials and a long production cycle