First, the advantages of thread milling cutter:
1) The thread milling cutter realizes high-precision and high-quality threaded hole processing. When using taps for thread cutting, the accuracy of the bottom hole often occurs, resulting in reduced thread accuracy and surface roughness. The use of thread milling cutter can have a larger chip removal space, because it is the relationship between milling processing, and can realize threaded hole processing with high surface roughness.
2) Stabilization and rationalization of threaded hole processing. In the past, the breakage of taps that have been used more often during cutting may cause failure. Thread milling cutters can achieve stable cutting due to the tool characteristics of threads.
3) It is easy to remove in the event of a breakage failure. The biggest problem when using a tap for threaded hole processing is the removal work at the time of breakage. In the unlikely event that a thread mill breaks off, it can be easily removed.
4) The thread milling cutter is made of fine-grained bar material, which has high rigidity and high-performance tool life;
5) The coating process is adopted to improve the heat insulation of the tool;
6) The spiral groove and blade shape design of the thread milling cutter has a smooth surface, is not easy to chip, enhances the rigidity of the tool, and can take into account the rigidity and chip removal of the tool; it makes the tool cutting easy and smooth chip removal;
7) brand thread milling cutter is suitable for processing aluminum, copper, cast iron, stainless steel, alloy steel, tool steel, tempered steel, titanium alloy, high temperature alloy and heat treatment die steel and other materials. Different thread cutters are used for processing different materials;
8) The thread milling cutter has high precision, and the processing accuracy requirements can be achieved through tool compensation; and the processing efficiency of the thread milling cutter is much higher than that of the tap;
9) The finish of the thread milling cutter is good, the milling teeth of the thread milling cutter are better than that of the tap, and the processing life is long, and there is no time to reduce the tool change;
10) Taps are easy to break and cause workpiece loss or scrapping. Thread milling cutters are not easy to break.
11) The thread milling cutter can mill the bottom of the cutter when processing blind holes, and for some materials, the thread milling cutter can realize drilling, milling, and chamfering in one piece;
12) The thread milling cutter can process internal and external threads of different rotation directions, and a thread milling cutter can be used for threaded holes caused by different threads of the same thread;
13) Even if the thread milling cutter is not outdated in the first processing, it can be corrected by making up the tool; when processing larger threaded holes,;
14) When the thread milling cutter cuts, it has short powder chips and no entanglement phenomenon; non-full tooth contact cutting, the machine load and cutting force are small; the clamping is simple, and ER, HSK, hydraulic, and thermal expansion and contraction holders can be used;
Second, the selection principle of thread milling cutter
1) Material hardness: high-hardness materials are about HRC40. If the material exceeds this hardness, use a high-hardness thread milling cutter, that is, two-tooth or three-tooth thread milling cutter. For processing below HRC40, use standard full-tooth or three-tooth thread milling cutters. thread milling cutter.
2) Internal thread or external thread: Some specifications of thread milling cutters are common for internal and external threads, such as metric M or American standard UN, and the same thread milling cutter can process internal and external threads.
15) Thread length: The basic principle to follow is that the thread length should not exceed 4 times the thread diameter. If the thread length is within 4 times, try to choose a solid carbide thread milling cutter. The use effect is good. If it exceeds 4 times the diameter, some specifications can be customized , Thread milling tools can be customized according to customer requirements.
16) Diameter of milling cutter: Select the diameter of the milling cutter close to the size of the threaded hole to be processed. For example, to process a threaded hole of M12×1.5, both φ8.2 and φ10 can be processed, and the diameter of the thread milling cutter with φ10 is selected, which has better rigidity .
17) Select the milling cutter material according to the material to be processed. For example, JK10CA is suitable for processing HRC40 and above and some titanium alloys, stainless steel, high-temperature alloys, etc., JK20CB is suitable for processing soft materials below HRC40, and JK10F is suitable for processing non-ferrous metals and other materials.
18) Thread size: Whether to choose an integral thread milling cutter or an indexable thread milling cutter, generally speaking, a solid carbide thread milling cutter is used below M12, and a custom-made indexable thread milling cutter is generally recommended for larger specifications. Of course, the customer's requirements and processing environment should also be considered. For example, when the finish is required to be high, an integral thread milling cutter should be selected.
7) Internal cooling thread milling cutter or external cooling thread milling cutter: Internal cooling thread milling cutter is not required, such as: processing high hardness materials, materials that are particularly difficult to process, deep hole threads or threads that require high finish, usually It can be processed with an externally cooled thread milling cutter.
3. Application of three-tooth thread milling cutter for difficult-to-machine materials
Due to the continuous development of the aviation industry in recent years, the demand for mechanical processing of difficult-to-machine materials is increasing, such as stainless steel, titanium alloys, high-temperature alloys, soft magnetic alloys, etc. Thread hole processing for difficult-to-machine materials is an important process before finished products , the demand is constantly increasing, the tap is a conventional processing method, but the disadvantage of the tap is that it is easy to break the knife, resulting in a large number of waste products, which increases the cost. Thread milling cutter, in view of its processing method is milling, the surface quality of the milled thread hole is good , It is not easy to break the knife, and even if the knife is broken, it will not produce waste products. It is an ideal choice for difficult-to-machine materials.
The three-tooth thread milling cutter for difficult-to-machine materials has the following characteristics:
1) Rigidity is good, the tool does not let the knife, and the depth of the threaded hole can reach 5 times the diameter.
2) The number of teeth can be selected from 4-8 teeth, and the size of the processed threaded hole is stable.
3) The range of threaded holes that can be processed is M1.6-M20, and both metric and American standard threads can be processed.
4) The tool material is solid carbide, and welded alloy thread milling cutter is optional.
Post time: Dec-27-2022
