Powder metallurgy brake yoke formulation and manufacturing process

Abstract

The invention discloses a brake magnet yoke formula for powder metallurgy and a fabrication technology thereof. The brake magnet yoke comprises the following steps: by taking 99.1-99.5% of atomized iron powder, 0.5-0.9% of micronized wax and 10-40mL / 100kg of bobbin oil, pouring into a stirring mill to agitate for 30-60 minutes, and then cooling after pouring out; loading the agitated raw materials into a feed hopper of a powder metallurgy press; feeding the raw materials into a mold cavity to carry out modulation and pressing along a powder delivery pipe; conveying the pressed product to a sintering furnace mesh belt, moving along the mesh belt from a dewaxing area to a sintering area to a cooling area; and finally sintering the product; machining the sintered product, and finally preparing the product. The utilization rate of the material achieves 97%; the surface roughness is improved to 0.8-1.6mu m; the rate of graded product is improved to about 98.5%, the brake magnet yoke formula is stable in quality; and the product is good in magnetic flow and less in residual magnetism, the service life of the brake magnet yoke is prolonged, the accuracy grade and the safety performance are improved, and the manufacturing cost is reduced.

Description

technical field [0001] The invention relates to a powder metallurgy brake yoke, in particular to a formula and a manufacturing process of a powder metallurgy brake yoke. Background technique [0002] The current brake yoke is made of steel (45# steel, A3 steel, etc.) through machining. First of all, the composition of steel is relatively fixed, and steel has a certain carbon content. For example, the carbon content of 45# steel is 0.42-0.49%, which leads to problems in the use of the brake yoke after machining. The main performance is that the residual magnetism is severe after the power is cut off. affect safety. And it will also lead to increased resistance of the components it controls, increased wear, and reduced service life. Secondly, the material utilization rate is low, and only about 50% of the raw materials are left after processing; third, the processing efficiency is low, only about 250 pieces per shift; fourth, the machining surface roughness is large, genera...

AI Technical Summary

Problems solved by technology

For example, the carbon content of 45# steel is 0.42-0.49%, which leads to problems in the use of the brake yoke after machining. The main performance is that the residual magnetism is severe after the power is cut off. affect safety

Moreover, it will also lead to increased resistance of the components it controls, increased wear, and reduced service life.

Secondly, the material utilization rate is low, and only about 50% of the raw materials are left after processing; third, the processing efficiency is low, only about 250 pieces per shift; fourth, the machining surface roughness is large, generally only up to 3.2 μm; fifth , more processes, more equipment used, poor quality stability