Slender rod-shaped tools (such as drills, reamers, etc.) are widely used in machining. Since the sharpening of the tool determines the shape and precision of the cutting part of the tool, it is not only a key process to ensure the performance of the tool, but also a key process to ensure the quality of the machined part.
The improvement of the accuracy of the slender rod-shaped tool has always been a difficult point in the manufacture of the tool. The main reason is that the effective part of the tool is too long, and the cutting edge of the tool is too far away from the clamping portion during manufacture. Since the cutting edge is too far from the clamping part and the clamping head has a certain clamping precision (generally 0.002~0.005mm), the radial rounding at the cutting edge of the tool may have been reached before the Grinding starts. 0.005mm to 0.01mm (or even larger).
Due to the strong grinding process when grinding the tool, especially the grinding of the sipe, the grinding force is large, and the elastic deformation of the tool is large. Many problems arise during the machining process, such as the asymmetry of the tool groove, the outer circle size of the tool, Blade parameters and shape errors do not meet the requirements, and even when the tool is broken, the tool is broken. The following is a simple analysis of the problem of tool accuracy when machining a slender rod-like tool.
First, the impact of processing machine tools on tool accuracy. The influence of machine accuracy on tool accuracy When manufacturing any tool, the accuracy of the machine tool is the key to determining the accuracy of the tool. Slender rod-shaped tools are no exception. The influence of the support block on the accuracy of the tool The support block equipped with the machine is mainly used for processing slender rod-shaped tools. The position can be adjusted in the horizontal and vertical directions, and can be positioned according to the actual situation. If the position of the support block in the lateral direction (ie, the axial direction of the tool) is unreasonable, a qualified elongated rod-shaped tool cannot be machined. If the support block is too low, the supporting force of the tool is insufficient, which will cause the sipe to form an inverted cone in the axial direction; if the support block is too high, the support block will hardly align with the tool, which will cause the sipe to form a straight cone in the axial direction. Therefore, the accurate positioning of the support block is also important for the accuracy of the tool.
Second, the impact of the Grinding Wheel on the accuracy of the tool. All parameters of the tool are determined by the relative movement of the grinding wheel and the tool. Therefore, the diameter of the grinding wheel, the angle at which the grinding wheel directly participates in the cutting, the length of the flange 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 tool. Grinding wheel angle measurement or input accuracy The grinding wheel angle measurement or input may be inaccurate: the blade edge width does not match the requirements; the step tool step surface angle does not match the requirements; the tool back angle position or angle has errors; the chip flutes There is an error in the groove angle.
Third, the cooling effect of the coolant on the grinding zone will directly affect the accuracy of the tool. Choosing a good performance coolant and proper cooling pressure will help the coolant to enter the grinding zone, taking the cutting heat and chips away in time, effectively reducing the surface roughness of the tool.
The accuracy of the slender rod-shaped tool seriously affects the quality of the machined part. This requires the accuracy of the slender rod-shaped tool to be accurate and reliable, so as not to affect the quality of the machined part, which will become smaller and larger, resulting in engineering accidents.
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