Technological characteristics of powder metallurgy gear machining

Technological characteristics of powder metallurgy gear machining

With the rapid development of high and new technology, the powder metallurgy industry has also been promoted, making the application of powder metallurgy gear bearings more and more extensive. Powder metallurgy gear is one of the powder metallurgy parts, which is widely used in motor industry, automobile and motorcycle industry, household appliances industry, digital products, office equipment, electric tools, textile machinery, auto parts, packaging machinery and other mechanical equipment. Now, we'd like to share with you the process characteristics of powder metallurgy gear processing:

When the powder metallurgy gear is not running, the lubricating oil fills its pores. When it is running, the gear rotates and heats up due to friction. The thermal expansion of the gear pad reduces the pores, so the lubricating oil overflows and enters the gear clearance. When the gear stops rotating, the gear shoe cools, the pores recover, and the lubricating oil is sucked back into the pores.

Powder metallurgy gear

Although it is possible for P/M gears to form complete oil film, in most cases, such gears are in the mixed friction state of incomplete oil film. The oil bearing shaft and gear bush materials that can make use of the porous characteristics of materials to fill the pores of lubricating oil include wood, long cast iron, cast copper alloy and powder metallurgy antifriction materials; The affinity between materials and lubricating oil can be used to make lubricating oil evenly dispersed in the materials. Most of the oil-bearing gear shoe materials are polymers, such as oil-bearing phenolic resin.

Powder metallurgy gear is made of metal powder and other antifriction materials by pressing, sintering, shaping and oil immersion. It has a porous structure. After being soaked in hot oil, the pores are filled with lubricating oil. During operation, due to the suction effect of journal rotation and friction heating, the metal and oil are heated and expanded, and the oil is squeezed out of the pores, thus the friction surface plays a lubricating role. After the gear is cooled, the oil is sucked back into the pores.

This is about the technological characteristics of powder metallurgy gear processing. Generally speaking, powder metallurgy gears can be formed at one time without cutting. The cost is lighter than machining, and the material waste is less, so the price is cheaper. It is also in line with the current national policy of promoting energy conservation, so it is considered to be a technology that will not fall behind. Friends with demand for powder metallurgy parts can call Zhongwei for advice on precision powder metallurgy.