On lathes, cutting and tapping are commonly used processing methods. Cutting tools are usually made of high-speed steel by hand grinding. It takes a long time for workers to complete a knife on the grinding wheel, which is time-consuming and laborious, which affects the processing efficiency.
A worker saw a small piece of grinding wheel using resin as a binder to machine high-speed steel tool holders, and in a short time removed most of the tool's sharpening allowance. This method is unique. Now, let’s introduce:
Processing mandrel. The diameter of the step is slightly smaller than the diameter of the sheet-shaped grinding wheel by 0.1 to 0.3 mm. The sheet-shaped grinding wheel is installed on the step, with rubber washers on both sides, tightened with nuts, and the rear end of the mandrel is supported by the tailstock. In this way, when the main shaft of the lathe rotates, it drives the grinding wheel to move at a high speed, forming the main movement of the cutting movement.
Fix the high-speed steel tool holder to be processed on the lathe tool post, and move the large and medium-sized tool post to make the position of the tool bar flush with the grinding wheel. After determining the position, first rotate the spindle at high speed, and then hold the handle of the middle tool post with your hand to drive the high-speed steel tool bar to continuously contact the grinding wheel. . During this process, the coolant is constantly added.
Through the cutting of the shadow part of the grinding wheel, that is, most of the grinding allowance of the tool is removed in a short time, and then the tool blank is removed, and manual grinding is performed to form a cutter and a thread turning tool in a short time. Practice has proved that this method is more effective when the number of tools is large.
