Mixed powder for powder metallurgy, method for producing same, and method for producing sintered body made of iron-based powder

Abstract

According to the present invention, the crystalline layered alkali silicate heat-treated in the range of 400 to 1100°C is used as the machinability-improving powder, and the amount of the machinability-improving powder is adjusted relative to the iron-based powder, alloy for The total amount of the powder and the powder for improving machinability is in the range of 0.01 to 1.0% by mass, whereby a mixed powder for powder metallurgy can be obtained without adversely affecting the furnace environment of the sintering furnace The sintering of the molded body can also be carried out, and a sintered body having both excellent lathe machinability and excellent drill machinability can be obtained.

Description

technical field [0001] The present invention relates to a mixed powder for powder metallurgy and its production method. The mixed powder for powder metallurgy is suitable for sintered parts of automobiles, etc., and is obtained by mixing iron-based powder, powder for alloy, powder for improving machinability, and lubricant. and, the present invention also relates to a method for manufacturing a sintered body made of iron-based powder, the sintered body made of iron-based powder is obtained by molding and sintering the mixed powder, especially, the present invention seeks to improve Machinability of sintered body made of base powder. Background technique [0002] Products utilizing powder metallurgy technology are being used in various fields since the advancement of powder metallurgy technology enables the manufacture of components with high dimensional accuracy and complex shapes into near net shapes. The powder metallurgy technology is characterized by a high degree of sh...

AI Technical Summary

Problems solved by technology

[0005] However, since Pb has a melting point as low as 330°C, it melts during sintering, but is not solid-soluble in iron, so there is a problem that it is difficult to uniformly disperse it in the matrix

In addition, since Se and Te embrittle the sintered body, there is a problem that the deterioration of the mechanical properties of the sintered body is remarkable.

[0006] In addition, since the above-mentioned voids have poor thermal conductivity, when machining a sintered body, frictional heat during machining is accumulated, and the surface temperature of the tool tends to rise.

For this reason, the cutting tool is easily worn out, and the service life is shortened. As a result, the cost of the cutting process increases and the production cost of the sintered part increases.

Images