Manufacture method of high-speed grinding head for processing precise hole and high-speed grinding head

Abstract

The invention relates to a method for manufacturing a high-speed grinding bit used for processing precise small holes. The method comprises: a grinding wheel connecting part, a transition rod of carbide and a motor connecting part are assembled into a grinding wheel lengthening shaft; one end of the transition rod of carbide is connected with the motor connecting part through hot extrusion, whilethe other end is connected with the grinding wheel through welding; after manufacturing the grinding wheel lengthening shaft, the motor connecting part of the grinding wheel lengthening shaft is connected with the output end of a drive motor; and the grinding wheel connecting part is connected with the grinding wheel through a grinding wheel nail. The method has the advantages of improving the rigidity of the grinding wheel lengthening shaft and saving the resetting and balancing working procedure. The high-speed grinding bit manufactured by the method comprises the drive motor, the grinding wheel lengthening shaft, the grinding wheel nail and the grinding wheel; the grinding wheel lengthening shaft consists of the transition rod of carbide, the motor connecting part and the grinding wheel connecting part; and one end of the transition rod of carbide is welded with the grinding wheel connecting part, while the other end is connected with an accommodating hole of the transition rod on the motor connecting part through the hot extrusion. The high-speed grinding bit has the advantages of improving the grinding quality of the precise small holes and improving the grinding production efficiency.

Description

technical field [0001] The invention relates to a machining tool for precision small holes, in particular to a manufacturing method of a high-speed grinding head for machining precision small holes and a high-speed grinding head used for machining precision small holes. Background technique [0002] At present, precision small holes with a diameter of 4 mm to 16 mm, a hole depth greater than or equal to 15 mm, a dimensional accuracy of IT5 to 7, a surface roughness value of less than or equal to Ra0.8 μm, and shape and position accuracy requirements generally use a speed of 100,000 Grinding with a high-speed grinding machine with rpm, the grinding head used is a high-speed grinding head. Using a high-speed grinding head to grind such precision holes with a small aperture and a large aspect ratio has the following problems: limited by the aperture diameter of the precision aperture, the diameter of the grinding wheel must be smaller than the aperture of the precision aperture...

AI Technical Summary

Problems solved by technology

Using a high-speed grinding head to grind such precision holes with a small aperture and a large aspect ratio has the following problems: limited by the aperture diameter of the precision aperture, the diameter of the grinding wheel must be smaller than the aperture of the precision aperture, which makes it difficult to connect the grinding wheel. The diameter of the long shaft of the grinding wheel is smaller; and according to the depth of the precision small hole, the long shaft of the grinding wheel must have sufficient cantilever length to meet the requirements of the processing depth

It can be seen that the long axis of the grinding wheel for processing precision small hole high-speed grinding heads has the characteristics of small diameter and long length. The processing accuracy and surface roughness of the workpiece are difficult to control, which also limits the improvement of the grinding amount and affects the production efficiency

In order to improve the rigidity of the long shaft of the grinding wheel, the existing measure is to directly weld a carbide transition rod in the middle of the long shaft of the grinding wheel. In order to eliminate the gas generated during welding, it is necessary to drill a diameter at the transition rod accommodation hole at the motor connection part. This hole is called the exhaust process hole. This exhaust process hole is easy to cause the unbalance of the long axis of the grinding wheel when it moves at high speed. Even if the exhaust process hole is blocked after welding, it will also cause the grinding wheel to be damaged due to the different filling materials. The long shaft is unbalanced during high-speed movement, which affects the machining accuracy of precision holes, so it is necessary to purchase special equipment for calibration and increase complex weight removal and calibration procedures.

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