Thin-walled sleeve parts have unique structures and properties. Their thin wall thickness and poor rigidity make the processing of thin-walled sleeve parts full of challenges. How to ensure accuracy and quality during processing is a problem that parts R&D engineers and technicians must face. This article will delve into the key points of processing thin-walled sleeve parts and provide a reference for specifying a reasonable processing plan.
Content
(1) Deformation caused by clamping the workpiece
(2) Effect of cutting amount on thin-walled parts
(3) Reasonably select the geometric angle of the tool
(4) Effect of cutting fluid on thin-walled parts
1. Deformation caused by clamping the workpiece
The diameter difference between the inner and outer circles of thin-walled parts is very small and the strength is low. If the clamping force is too strong when clamping on the chuck, the thin-walled parts will be deformed, resulting in excessive roundness, cylindricity and coaxiality of the parts. Difference. If the clamping is not tight during turning and grinding, the parts may become loose and scrapped. Generally, the deformation of parts is controlled by controlling the clamping force. The clamping force should be larger during rough turning and smaller during fine turning and grinding. When processing thin-walled parts, open-front sleeves or sector-shaped soft claws can be used to clamp the workpiece. During the process of clamping parts, the shape and structure of the parts are different, and the magnitude and action point of the force are different, which may affect the shape accuracy of the parts.
2.Effect of cutting amount on thin-walled parts
The size of the cutting force is closely related to the cutting amount. Back cutting amount, feed amount, and cutting speed are the three factors of cutting amount. Reasonable selection of three elements can reduce cutting forces and thereby reduce deformation.
3. Reasonably select the geometric angle of the tool
In the turning of thin-walled parts, the reasonable geometric angle of the tool is crucial to the magnitude of the cutting force during turning, the thermal deformation generated, and the microscopic quality of the workpiece surface. The size of the tool rake angle determines the cutting deformation and the sharpness of the tool rake angle. The tool rake angle is large, the cutting deformation and friction are reduced, and the cutting force is reduced. However, if the rake angle is too large, the wedge angle of the tool will be reduced, the tool strength will be weakened, the heat dissipation of the tool will be poor, and the wear will be accelerated.
4. Effect of cutting fluid on thin-walled parts
During the turning process, due to cutting deformation and friction between chips, the tool and the workpiece, a large amount of heat is generated, which is transmitted to the tool, reducing the hardness of the tool, accelerating tool wear, and increasing the surface roughness of the workpiece; it transmitted to the workpiece, causing thermal deformation of the workpiece. The existence of cutting heat is very detrimental to turning thin-walled parts. Full use of cutting fluid during the turning process not only reduces cutting forces, improves tool life, and reduces the surface roughness value of the workpiece; at the same time, the workpiece is not affected by cutting heat, ensuring the processing dimensions and geometric tolerances of the part.
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Post time: Jan-04-2024