The following is an analysis of the accuracy of CNC lathes for machining slender rod-shaped cutting tools: the improvement of the accuracy of rod-shaped cutting tools,
It has always been a difficult point in tool manufacturing, mainly due to the long effective part of this type of tool and the distance between the tool edge and the clamping part during manufacturing.
Due to the distance between the cutting edge and the clamping part, as well as the certain clamping accuracy of the chuck (usually 0.002-0.005mm), before starting grinding,
The radial circular runout at the cutting edge of the tool may have reached 0.005mm to 0.01mm (or even larger).
Due to the use of strong grinding technology in grinding tools, especially in grinding tool slots, the grinding force is relatively large, resulting in significant elastic deformation of the tools and causing many problems during the machining process,
If the groove shape of the tool is asymmetric, the outer circle size, edge parameters, and shape errors of the tool do not meet the requirements, and in severe cases, it may even lead to the tool being broken.
Below is a brief analysis of the issues related to tool accuracy when machining slender rod-shaped cutting tools on CNC lathes.
1, The impact of machining tools on tool accuracy. The impact of machine tool accuracy on tool accuracy When manufacturing any tool, the accuracy of the machine tool is the key to determining tool accuracy,
Slender rod-shaped cutting tools are no exception. The influence of support blocks on tool accuracy The support blocks equipped on this machine tool are mainly used for CNC machining of slender rod-shaped tools,
Its position can be adjusted horizontally and vertically, and can be positioned according to actual conditions. If the position of the support block in the transverse direction (i.e. the axial direction of the tool) is not selected reasonably,
It is not possible to produce qualified slender rod shaped cutting tools. If the support block is too low and the support force for the tool is not enough, it will cause the tool groove to form an inverted cone in the axial direction; The support block is too high,
If the support block is hard pressed against the tool, it will cause the tool groove to form a cone in the axial direction. Therefore, accurate positioning of the support block is also important for the accuracy of the tool.
2, The influence of CNC lathe machining grinding wheel on tool 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 at which the grinding wheel directly participates in cutting, the flange length of the grinding wheel shaft, the wear of the grinding wheel, and the particle 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 does not meet the requirements; The angle of the step surface of the step tool does not meet the requirements;
There is an error in the position or angle of the back corner of the tool; The groove angle of the chip removal groove has errors, etc.
3, The cooling effect of coolant on the grinding area during the processing of hardware parts will directly affect the accuracy of the tool.
Choosing a high-performance coolant and appropriate cooling pressure is beneficial for the coolant to enter the grinding area, taking away cutting heat and chips in a timely manner, and effectively reducing the surface roughness of the tool.
