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Left and right infeed method: For machining large pitch threads, multi-threaded parts, etc., because the working surface is too wide, the contact surface is large. With the straight-through method, it will have a great impact on the machine tool, the tool, and the workpiece, and even cause the phenomenon of knife, fly, and car. Therefore, only by taking the left and right approach to complete.
The machining method is to complete the machining of one side of the thread by changing the direction of the Z-axis, that is, the starting point of the infeed, and finishing the other side, and finally finishing the two sides and the bottom surface. This method is called the left and right approach. Note: It is a side and side machining to reduce the contact area between the tool and the workpiece. It can be processed with one knife left and one knife right. The role is to expand the slot.
Tapping, the buckle should be classified as direct forming of the tool.
This method of machining multi-start threads does not require re-adjusting the tool or workpiece and does not require separate cutting of each thread. This tool is very simple. That is, a corresponding thread comb is welded to the arbor, and the arbor is mounted on the lathe.
For example, a four-start thread with a lead of 1/4 inch, so its pitch is 16 teeth per inch (or 1/16 inch), using a threaded comb with a pitch of 1/16 inch, with at least four teeth. The comb is brazed to the arbor, the shank is mounted on the lathe tool holder, and the natural carriage feed is adjusted to 0.25 inch/rev. Each time the cutting is performed, the four threads are processed once. There is no need to re-index here, and the processing time is 1/4 of the general processing time. And the finish and contour of all four threads are consistent.
In this way, any number of internal and external threads can be machined.
Straight-forward method: general thread, small pitch, fine thread can be processed by straight-through method. The Z-axis (axial direction) of the tool is not changed during the machining process, and the feed is in the order of diameter (diameter). To complete the cutting of the thread.
June 04, 2020