What is sintering?
Sintering is a technique for processing parts by hardening metal powder and baking it at a temperature lower than the melting temperature of the metal to “form the part”, a process called powder metallurgy. Sintered parts are called “sintered metals” or “sintered products”.
high-performance sinter bronze bushings
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Sinter Bronze Bushing
VIIPLUS can offer shaped sintered components in a variety of iron or bronze materials. It’s the ability to produce complex shaped parts to close tolerances in volume at a much lower cost.
Sintered bronze bushings are rigid, temperature resistant, and high strength parts formed through the process of sintering or powder metallurgy. Used in applications for shock absorbers, home appliances, automobiles, and as well as most commonly as bearings or bushings, sintered bronze parts can be produced in large quantities with consistent properties and sizes.
Preferred Sinter Bearing Material
Bronze is an ideal material choice for the process of sintering as it is a non-ferrous metal is commonly used as a conductive material and its porosity allows lubricants, or air and liquids to pass through it. Through an effective sintering process, the properties of material strength, translucency and thermal conductivity are enhanced and because it is a simple process, most of the other physical properties of the metal are retained.
Oil Impregnated Bronze Bushing
The bush in Sintered Bronze gives a wide range of applications, and is realized with a powder of bronze sintered, calibrated, and impregnated into specific oil (volume of impregnation of 25% ÷ 29% as per DIN 30910 Sint A50). During the application, this kind of material, thanks to the oil impregnation, develops a film of lubricant oil, between the shaft and the bush.
Self-lubricating & Maintenance-free
The self-lubricating effect depends almost entirely on the spread of the lubricating oil in the bearing point, and this effect only occurs with increasing frictional heat. Sintered bushings are primarily suitable for high-frequency or otherwise high-speed plain bearing applications. For slower or more sporadic intermittent applications, other types of plain bearings are more suitable. If the user wants to do without externally supplied lubrication or seals, there is hardly any alternative to plain bearings with solid lubricants.
Applications | sintered bronze bearings
The resulting porosity of the sintered parts makes powder metal products especially useful in lubricating applications and as a result, bearings and wear plates are often fabricated from sintered bronze. These porous components are also commonly used to create filtration materials, especially for high-temperature applications such as those in the food or pharmaceutical industries. Common applications are:
Packaging machines, Automotive, Power tools, Domestic appliances, Starter motors.
The manufacturing process of sintered Bronze bushings
1. Raw materials.
Make the raw materials into powder
2. Mixing.
Mix the required powder in a certain proportion and homogenize it to make a blank powder.
3. Compression molding.
The mixed material will be uniformly mixed and loaded into the compression mold to make the billet with a certain shape, size, and density. It is compressed from a vertical direction with high pressure to increase density and strength. Sintering is commonly used with complex shapes but is also limited by the structure of the mold.
4. Sintering.
Compressed parts are in a “fragile” state. Like a cookie, it can be easily cracked by hand. Sintered products have strong mechanical properties through heat. Sintering means “baking and bonding”, baking in a sintering furnace at a temperature below the melting temperature of the metal (800 to 1300°C). The sintering furnace is filled with a protective gas to prevent oxidation of the molded product. The powder particles in the sintered molded product become stronger by fusion bonding.
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5. Dimensioning.
The dimensional accuracy of the sintered product is improved by applying pressure to the sintered product again in the mold.
6. Post-treatment.
To further improve the accuracy and strength, machining and heat treatment are performed if necessary. In addition, because sintering is manufactured using high-precision molds, there is high dimensional accuracy and less post-molding processing. Since sintering allows mass production of high-precision parts, it is used to manufacture various mechanical components (bearings, gears) and other various mechanical components, including automotive parts. The mechanical strength is inferior compared to that fine casting molding.
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