The thread-cutting tool has several main types.
Threaded cutters and combs - this is a shaped tool used on metal cutting machines, can be rod, prismatic and round. It has a simple design, versatility and manufacturability. Cuts internal and external threads on cylindrical and conical surfaces.
Taps are a thread-cutting tool used for
processing metal by cutting in pre-prepared holes for internal threads. It has the appearance of a hardened screw, which has slotted grooves running along the shaft and acting as cutting edges. They are manual and machine. For its manufacture, hard alloy is used or
high-speed steel is used.Dies - a thread-cutting tool having the form of a hardened nut, which has axial holes with cutting edges. The shape of the tool is equipped with holes for chip evacuation. The cutting part of the tap is made in the form of an inner cone. The die can be made of alloyed and high-speed steel, and it is also possible to manufacture from a hard alloy. Designed for cutting external threads and calibrating on various types of parts.
Threaded milling cutters - a thread-cutting tool having several teeth (blades) for machine milling. They are cylindrical, end, worm, end and conical. They process wood, copper, graphite, aluminum, cast iron, steel, hardened steel and stainless steel. The cutting part can be made of high speed steel, cermets, hard alloy and diamond.
Die threading
The workpiece, which has the form of a round rod with a diameter equal to the desired thread, is clamped in a vertical position in a vice. For a comfortable approach of the die, a small chamfer is removed with a file. The die is fixed in the socket and is put on the workpiece, well lubricated with machine oil. With a slight pressure on the die, they begin to screw on the rod, trying to avoid distortions. After making a small number of turns clockwise, the die is returned to the place, about half a turn. And continue in this way throughout the entire process of threading.
How to thread a tap
For this process, you will need to drill a hole and chamfer for the tap to enter correctly. Using the directory, the diameter of the hole is selected, starting from the desired
thread pitch.Each set of size has three types of taps, where each performs its function. The first is needed for a preliminary pass, the second is used to complete the process, and the third is for finishing. The threading process follows the same principle as the die. Repeating several cycles back and forth with a lot of engine oil. During the process of cutting blind holes, it is recommended to turn the tap periodically to remove accumulated chips. Continue until tangible stop.