Manufacturing process of aluminum bronze bearings

1. Composition control: The performance of aluminum bronze is closely related to its chemical composition. It is necessary to accurately control the content and proportion of elements such as copper and aluminum to ensure that the alloy has the desired high strength, wear resistance, corrosion resistance and other properties.

2. Melting process:

Oxidation and gas absorption: During the smelting process, elements such as aluminum are easily oxidized to form high-melting-point oxide inclusions, which reduce the performance and quality of the alloy. At the same time, it may also absorb gases (such as hydrogen), resulting in defects such as pores in the castings. To solve this problem, it is usually necessary to adopt a suitable smelting method (such as medium frequency or industrial frequency coreless induction furnace smelting), add covering agents and refining agents (such as cryolite), and try to avoid overheating of the melt to reduce oxidation and gas absorption.

Temperature control: The melting temperature needs to be precisely controlled. Too high a temperature will aggravate the burning and oxidation of elements, while too low a temperature may lead to uneven alloy composition and poor fluidity, affecting the casting quality.

3. Casting process:

Solidification shrinkage: Aluminum bronze will shrink greatly during the solidification process. If the casting process is not appropriate, it is easy to produce defects such as shrinkage cavities and shrinkage, which will affect the density and mechanical properties of the bearing. To solve this problem, it may be necessary to adopt a suitable casting method (such as semi-continuous casting), optimize the mold design, set reasonable risers and chills, etc. to compensate for the solidification shrinkage.

.Segregation problem: Alloy elements may segregate during the solidification process, resulting in local uneven composition and affecting the uniformity of bearing performance. Segregation can be reduced by optimizing melting and casting process parameters, using appropriate stirring or vibration methods, etc.

4. Heat treatment process: Heat treatment is an important step in improving the performance of aluminum bronze bearings, but the process control is difficult. For example, the temperature, time and cooling rate of the solution treatment, the temperature and time of the aging treatment, etc., all need to be precisely adjusted according to the specific alloy composition and performance requirements. If the parameters are inappropriate, the expected performance improvement effect may not be achieved, and it may even cause performance deterioration or new defects.

5. Machining: Aluminum bronze has high strength and hardness, which brings certain difficulties to machining, such as large cutting force, fast tool wear, and difficult to ensure the quality of the machined surface. It is necessary to select appropriate machining process parameters, tool materials and geometric shapes, and adopt appropriate cooling and lubrication measures to improve machining efficiency and quality.

6. Surface treatment: In order to improve the corrosion resistance, wear resistance or other properties of aluminum bronze bearings, surface treatment is often required, such as chrome plating, zinc plating, phosphating, etc. However, problems may also occur during the surface treatment process, such as poor coating adhesion, uneven thickness, surface roughness that does not meet the requirements, etc., and the surface treatment process and quality need to be strictly controlled.

7. Quality inspection and control: Due to the high performance requirements of aluminum bronze bearings, comprehensive and strict quality inspections are required for raw materials, intermediate products (such as ingots, billets) and finished products, including chemical composition analysis, mechanical properties testing, metallographic structure observation, non-destructive testing, etc. to ensure that the products meet relevant standards and design requirements, which also increases the complexity and difficulty of the manufacturing process.

The manufacturing process difficulties of aluminum bronze bearings mainly include the above aspects . If you want to know more about the manufacturing process of aluminum bronze bearings, please pay attention to www.cn-czpufa.com