Influence of geometric parameters of precision parts machining tools on cutting performance?
The cutting performance of the tool in precision parts processing is closely related to the material of the tool, the structure of the tool and the geometric parameters of the cutting part of the tool.
The geometric parameters of the cutting part of the tool have great influence on the surface quality and cutting performance of the workpiece. Reasonable selection of the geometric angle of the tool is of great significance to the smooth implementation of the processing technology, it plays a decisive role in ensuring the processing quality of workpieces.
Cutting Parameters of cutting tools geometric parameters of cutting tools have the following four effects on cutting performance: 1. Influence of rake angle on cutting performance: the size of rake angle affects deformation, friction and cutting force during cutting, it also affects the strength and heat dissipation volume of the tool, thus affecting the tool life and productivity.
Increasing the rake angle can reduce cutting deformation and friction, thus reducing cutting force, cutting heat and improving surface quality.
2. Influence of back angle and vice-back angle on cutting performance: the size of back angle and vice-back angle directly affects the friction and tool strength between the back of the tool and the transition surface of the workpiece during the machining of precision parts, the larger the back angle is, the sharper the cutting edge is. However, when the back angle is too large, the strength and heat dissipation capacity of the cutting edge will be reduced due to the small wedge angle β 0.
Therefore, only by selecting the appropriate back angle value can a higher tool life be obtained.
3. Influence of main deflection angle and vice deflection angle on cutting performance: the main deflection angle and vice deflection angle determine the tool tip, the size of ε r, therefore, it directly affects the strength, heat conduction area and heat dissipation volume at the tool tip.
The main deflection angle decreases, the volume increases, the tool strength increases, the heat dissipation condition improves, the tool strength and service life are improved, at the same time, the main deflection angle and the auxiliary deflection angle are reduced, and the residual surface on the workpiece surface is reduced, the surface roughness value of the workpiece is also small, and the influence of the secondary deflection angle is obvious.
The main deflection angle also affects the magnitude and proportion of the three cutting components. Reducing the main deflection angle will increase the back force Fp and cause vibration.
In addition, the main deflection angle also affects the load and chip effect per unit length of the cutting edge.
The main deflection angle also affects the surface shape of the workpiece. When turning the stepped shaft, Kr = 90 and 93 should be selected;
When turning the outer circle, end face and inner hole with chamfer, Kr = 45 should be selected.
The main function of the Vice deflection angle K' r is to reduce the friction between the vice cutting edge and the machined surface. Its size has a great influence on the surface roughness and tool life.
4. Influence of edge inclination angle on cutting performance: edge inclination angle mainly affects the surface quality of workpiece and tool strength in precision parts processing. Changing edge inclination angle can control the direction of chip flow.
When finishing the car or semi-finishing the car, it is hoped to take the positive edge inclination angle so that the chip flows to the surface to be processed without scratching the processed surface.
Increase the absolute value of the blade inclination angle, make the cutting edge sharp, cut off a very thin metal layer, and improve the quality of the machined surface.
The negative edge inclination angle is selected to increase the volume of the cutter head and the strength of the cutter.
Therefore, many high-performance turning tools are characterized by increasing the rake angle of the cutting tool and selecting the negative edge inclination angle. During cutting, they can not only cut deformation, but also effectively ensure that the cutting tool has sufficient strength, therefore, the contradiction that 'sharpness and firmness' are difficult to coexist when the cutter is in use is solved.
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