The following is the accuracy analysis of CNC lathe machining slender rod-shaped tools: the improvement of the accuracy of rod-shaped tools,
The main reason is that the effective part of the tool is too long and the cutting edge is too far from the clamping part.
Because the cutting edge is too far away from the clamping part, and the clamping accuracy of the collet is generally 0.002-0.005mm, so before grinding, the cutting edge is too far away from the clamping part,
The radial circle runout at the cutting edge of the tool may have reached 0.005mm-0.01mm (or even greater).
Since the powerful grinding process is used to grind the cutting tools, especially when grinding the tool groove, the grinding force is large and the elastic deformation of the cutter is large, which will cause many problems in the machining process,
If the groove shape of the tool is not symmetrical, the size of the tool’s outer circle, the parameters of the cutting edge and the shape error do not meet the requirements, and even the tool is broken.
The following is a simple analysis of the accuracy of the tool when machining slender rod-shaped tools by CNC lathe.
1、 The influence of machine tools on tool accuracy. The influence of machine tool accuracy on tool accuracy when manufacturing any tool, the accuracy of machine tool is the key to determine the accuracy of tool,
Rod shaped tools are no exception. The support block is mainly used for NC machining slender rod-shaped tools,
Its position can be adjusted both horizontally and vertically, and can be positioned according to the actual situation. If the position of the support block in the transverse direction (i.e. the axial direction of the tool) is not reasonable,
The qualified slender rod-shaped tool cannot be machined. If the support block is too low, the support force to the tool is not enough, which will cause the tool groove to form an inverted cone in the axial direction; if the support block is too high, the tool groove will form an inverted cone,
If the support block is hard against the tool, the tool groove will form a cone along the axial direction. Therefore, the accurate positioning of the support block is also very important to the accuracy of the tool.
2、 The influence of CNC machining on grinding wheel accuracy. All parameters of the tool are determined by the relative motion between the grinding wheel and the tool,
Therefore, the diameter of the grinding wheel, the angle of the grinding wheel directly participating in cutting, the flange length of the grinding wheel shaft, the wear of the grinding wheel and the grain size of the grinding wheel all affect the accuracy of the cutting tool.
The accuracy of grinding wheel angle measurement or input may cause: the width of the blade edge belt does not meet the requirements; the step surface angle of the step tool does not meet the requirements; the angle of the step surface of the step tool does not meet the requirements;
There is an angle error in the position of the tool.
3、 The cooling effect of the coolant on the grinding area will directly affect the accuracy of the cutting tool when machining hardware parts.
The selection of coolant with good performance and proper cooling pressure is conducive to the coolant entering the grinding zone, which can take away the cutting heat and chips in time, and effectively reduce the surface roughness of the tool.
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