Small Bevel Gear PM Sintered Part

Product Introduction

Product advantages

A powder metallurgy spiral bevel gear relates to a gear part. It includes a frustum gear body, the gear shaft is connected to the center of the large end of the gear body; a number of evenly distributed spiral bevel teeth are arranged on the circumference of the gear body; the outer wall, tooth top and both sides of the tooth root of the spiral bevel teeth with rounded corners.

Qinhuangdao Zhongwei Precision Machine Parts Co., Ltd., Press Molding Division (PM) specializes in the production of powder metallurgy products such as high-precision, low-noise oil-impregnated bearings and high-performance mechanical structural parts. Injection Molding Division (MIM) specializes in the production of complex, high-strength, high-precision parts with rich experience and environmental protection. The company is located in Qinhuangdao, where Qinshihuang enters the sea, Hebei Province. The geographical location is superior and the transportation is convenient. The main products are copper-based, iron-based, iron-copper-based oil-impregnated bearings, gears, cams, stainless steel parts and other mechanical parts and various special-shaped structural parts. Widely used in household appliances, automobiles, motorcycles, electric tools, office equipment, textile machinery, food machinery, locks, furniture, toys and other industries.

What is the production process of powder metallurgy? Powder metallurgy technology has developed rapidly, and with the continuous emergence of new production processes and technical equipment, it has become an important part of modern industry. The production process of powder metallurgy can be divided into five stages: powder making→mixing→forming→sintering→post-treatment.

1. Milling:

Pulverization is the process of making raw materials into powder. Common pulverization methods include oxide reduction method, atomization method, electrolysis method, rotating electrode method, and mechanical crushing method.

2. Mixture:

Mixing is the process of mixing various required powders in a certain proportion and homogenizing them to make powder blanks. The mixing method is divided into three types: dry type, semi-dry type and wet type. During the powder pre-mixing process, due to the different specific gravity of the particles of different components, segregation will occur during the powder mixing process. Tianshi powder metallurgy binder can effectively improve the segregation. Due to the different particle sizes and uneven distribution in the powder, the porosity will easily increase. , the binder can make the particles distribute reasonably, fill the pores, and improve the compact strength.

3. Forming:

Forming is the process of putting the uniformly mixed mixture into a die and pressing it into a parison with a certain shape, size and density. Commonly used methods for forming include room temperature press forming and heating press forming. Tianshi powder metallurgy lubricants can effectively reduce internal and external friction, reduce the loss of pressing pressure, increase the density of the compact, and during the demoulding process, can reduce the demoulding force and prolong the service life of the mold, so that the parts have better surface finish .

4. Sintering:

Sintering is the process of diffusion, welding and recrystallization between the parison particles through sintering, so that the powder particles are firmly welded together, the pores are reduced, the density is increased, and finally a "crystal combination" is obtained, thus The process of obtaining certain physical and mechanical properties required.

5. Post-processing: Powder metallurgy products can be used directly after sintering; but when the performance requirements of the product are high, post-processing is often required. The commonly used post-processing methods are as follows:

1) Shaping: Put the sintered parts into a shaping mold similar to the die structure, and perform another pressing on the press to improve the dimensional accuracy of the parts and reduce the surface roughness of the parts, which is used to eliminate the sintering process. The slight deformation caused by it.

2) Oil immersion: the process of putting the parts into hot oil at 100~200 °C or making the oil penetrate into the pores of the powder parts under vacuum. Parts soaked in oil can improve wear resistance and prevent parts from rusting.

3) Steam treatment: Iron-based parts are treated in 500~600°C water vapor to form a hard and dense oxide film on the inner and outer surfaces of the parts, thereby improving the wear resistance of the parts and preventing the parts from rusting.

4) Vulcanization treatment: place the parts in a molten sulfur tank at 120°C, take them out after more than ten minutes, and reheat to 720°C under the protection of hydrogen to make the pores on the surface of the parts form sulfides. Vulcanization treatment can greatly improve the friction reduction and processing performance of parts.

Metal Injection Molding Process

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