An elongated rod-type tools (such as drills, reamers, etc.) in a machine is widely used in processing. As the sharpening of the tool determines the shape and accuracy of the cutting part of the tool, it is not only the key process to ensure the performance of the tool, but also the key process to ensure the quality of the processed part.
Slender rod-like tool to improve the accuracy has been the tool manufacturing difficulties, the main reason is that the effective part of the tool is too long, the manufacturing blade cutting edge too far from the clamping part. Since the cutting edge is too far away from the clamping part, and the clamp has a certain clamping accuracy (usually 0.002 ~ 0.005mm), it is possible that the radial runout at the cutting edge of the tool may have been reached before grinding starts 0.005 mm to 0.01 mm (or even larger).
Grinding the tool, especially the grinding groove when the use of powerful grinding process, grinding force larger, so that the elastic deformation of the tool, the process will have many problems, such as tool groove asymmetry, the tool size, Blade parameters, the shape of the error does not meet the requirements, and even lead to serious tool is broken. The following machine tool slender rod-like tool-related problems when the accuracy of the tool for a simple analysis.
First, the processing machine tool accuracy impact. The impact of machine accuracy on the accuracy of the tool When manufacturing any tool, the accuracy of the machine tool is the key to determining the accuracy of the tool, slender rod-like tool is no exception. Impact of the support block on the accuracy of the tool The machine is equipped with support block is mainly used for processing slender rod-like tool, its position in the horizontal and vertical are adjustable, can be positioned according to the actual situation. If the support block is not properly selected in the transverse (ie, axial direction of the tool) position, a properly slender rod-shaped tool can not be machined. If the support block is too low, the supporting force to the tool is not enough, the knife slot will form a reverse taper in the axial direction. If the support block is too tall, the support block will be hard against the tool, which will cause the sipe to form a forward cone in the axial direction. Therefore, the exact positioning of the support block is also important for the accuracy of the tool.
Second, the impact of wheel accuracy of the tool. All the parameters of the tool are determined by the relative movement 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 abrasion of the grinding wheel and the grain size of the grinding wheel all affect the precision of the cutting tool. Wheel angle measurement or input accuracy Wheel angle measurement or inaccurate input may result in: the width of the blade edge does not meet the requirements; ladder tool step surface angle and requirements do not match; tool posterior angle or angle error; Groove angle error.
Third, the coolant cooling zone on the cooling effect will have a direct impact on the accuracy of the tool. Select the excellent performance of the coolant and the appropriate cooling pressure is conducive to coolant into the grinding zone, the cutting heat and chip away in time, effectively reducing the tool surface roughness.
The precision of slender rod-like tools seriously affects the quality of the machined parts, which requires that the precision of slender rod-shaped tools must be accurate and reliable, so as not to affect the quality of the machined parts and small to become larger, which eventually leads to engineering accidents.