The rolling bearings produced by Longchang Jie Machinery Co., Ltd. cover various aspects from material selection to final assembly, maintenance, etc. This article mainly introduces them from the following aspects:
- Processing techniques
· Material selection
The commonly used materials for rolling bearings include high-carbon chromium steel (GCr15), stainless steel, ceramics, etc.
· Rough processing stage
1. Cutting steel pipes: The company cuts the original steel pipes to the specific length required by the customer to facilitate the determination of a rough size for the subsequent processing.
2. Hot rolling: We first heat the steel pipes to a high temperature to make the material softer, and then use pressure to shape them into a similar form.
3. High-temperature quenching: Perform high-temperature quenching treatment on the hot-rolled steel tube to increase its hardness and strength.
4. Outer circle turning: Mount the steel tube that has undergone high-temperature quenching on the lathe and turn the outer diameter to the precise size.
5. Inner and outer circle grinding: Place the rolled bearing that has been turned on the outer diameter into the grinding machine and grind the inner and outer circles to improve the dimensional accuracy and surface quality.
6. High-temperature tempering treatment: Eliminate the internal stress of the rolled bearing after grinding.
· Fine processing stage
1. Smooth grinding machine processing: Perform smooth grinding on the rolled bearing after the rough processing on the smooth grinding machine to improve the dimensional accuracy and surface quality.
2. Grinding processing: Place the ground rolled bearing into the grinding machine to make the surface smoother.
3. Ultra-precision grinding processing: Use an ultra-precision grinding machine to further improve the dimensional accuracy and surface quality of the rolled bearing.
4. Cleaning: Remove the dirt and residues on the surface of the rolled bearing after grinding and ultra-precision grinding.
5. Component processing: Process the mating parts of the rolled bearing, such as the outer ring, inner ring, and balls, according to the design requirements.
6. Structural assembly: Use automated equipment to assemble the mating parts of the rolled bearing to the corresponding positions.
7. Rust removal treatment: Ensure that the assembled rolled bearing surface is smooth and free of contamination.
8. Lubrication: Reduce the friction and wear of the rolled bearing.
- Other key processes
1.Milling: This is a very basic step. We rely on it to shape the flat surface of the bearing part into the specified size and shape.
2. Final grinding: This step is particularly crucial. We need to use tungsten steel or other hard grinding wheels to grind. This can further improve the accuracy and consistency of the size, and this job has high requirements for the skills and experience of our operators.
· Assembly method
1. Pressing method:Use a press machine or appropriate tools to smoothly press the shaft neck or the bearing housing hole in, avoiding shock or skewing.
2. Hot-fitting method: Use this method when the interference fit between the bearing and the shaft is large. We heat the bearing to no more than 80℃, allowing the inner diameter to expand slightly larger than the shaft diameter. During heating, keep an eye on the temperature with a thermometer. Once the appropriate temperature is reached, quickly install it onto the shaft and then use special tools or equipment to secure it properly.
3. Knocking method: Use this for small-sized bearings with a small interference fit. Use a copper rod or soft material to pad the inner ring of the bearing, and gently strike the copper rod with a hammer to allow the bearing to slowly enter the shaft neck or the bearing seat hole. Pay attention to applying even force and do not be too strong.
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