OEM high quality sheet metal assembly
Reasonable tool selection and optimized machining methods are very important to improve machining efficiency and prolong tool life, especially when machining difficult-to-machine aerospace parts. OEM high quality sheet metal assembly
A high-quality tool for difficult-to-machine materials must have an ultra-fine grain tool body, a sharp cutting angle, a strong cutting edge, and a heat-resistant surface coating. According to the application experience of processing difficult-to-machine materials in the past, the reasonable selection of processing methods and parameters is very important for processing such difficult-to-machine materials. The use of special processing skills is very effective to improve processing efficiency and prolong tool life.
No matter which processing method is used, the purpose is to minimize the temperature of the cutting part of the tool tip and the machined area of the part, prevent the surface hardening of the machined part and the temperature of the tool tip from being too high, increase the heat dissipation area, and control the cutting force. For example, the use of trochoidal cutting and high-feed milling can improve its processing efficiency and prolong tool life.
First: Sufficient cooling, appropriate machining line speed, effective chip breaking, and reasonable tool wrapping angle are very effective in controlling the temperature of the tool tip. OEM high quality sheet metal assembly
For CNC machine tools and tools with internal cooling at the same time, the internal cooling function that is most conducive to cooling should be used as much as possible, so that the powerful high-pressure water flow can take away a large amount of cutting heat and ensure that the processing area is kept within a certain temperature range. Even if there is no machining equipment with internal cooling function, it is recommended to use the external internal cooling tool holder, and at the same time increase the cooling pressure and improve the cooling effect.
Second: Properly controlling the cutting force and cutting speed of the tool is also one of the most effective ways to reduce the temperature of the machining area and prolong the life of the tool.
Generally, when machining difficult-to-machine materials, finely ground tool edges, small depth of cut and cutting width are generally used. According to different difficult-to-machine materials, part structure and processing equipment and other factors, it is very important to select a reasonable cutting line speed. In normal processing, nickel-based alloys should be controlled at 20~50m/min, titanium alloys should be controlled at 30~110m/min, and PH stainless steel should be controlled at 50~120m/min.
Third, for the same machine tool and parts, the method of machining difficult-to-machine materials can greatly affect the machining efficiency and tool life of the tool. OEM high quality sheet metal assembly
Whether trochoidal machining, helical interpolation and high-feed milling are used, the purpose is to reduce cutting force and temperature in the cutting zone. The trochoidal plunge method can minimize the cutting area, make the actual cutting wrap angle of the tool smallest, and prolong the heat dissipation time of each tooth of the tool; the helical interpolation makes the cutting amount of each tooth relatively uniform, especially in the corners; For the cutting method, the cutting force is effectively reduced with a small depth of cut and a large feed, so that the minimum cutting heat is generated during processing, and the temperature of the processing area is the lowest.
Fourth, it is also an effective way to control the temperature rise to ensure chip breakage during processing.
Generally, a large amount of cutting heat is generated on the chips in metal processing, and effective chip breaking will cause a large amount of cutting heat generated in the processing to be taken away by the chips. Normally, we don’t want long chips during machining. More attention should be paid to the processing of difficult-to-machine materials, especially for the roughing process, when the rigidity of the entire processing system allows, it should try to make chips break during the entire processing process, and try to use up-cut milling to make the formed iron The scraps are thinned from thick to thin, and the shape of the iron filings is “9”, “6” or “C”. OEM high quality sheet metal assembly
Fifth, maintain an appropriate effective tool wrap angle during machining, so that each effective machining tooth of the tool can maximize the longest cooling time.
Maintaining an appropriate and reasonable effective wrapping angle of the tool during processing is very beneficial to improve the cutting efficiency of difficult-to-machine materials and prolong the tool life. It is extremely important for machining difficult-to-machine material parts. The effective wrapping angle of the tool, reflected in the cutting parameters, has a direct relationship with the depth of cut Ap, the width of cut Ae and the tool diameter Dc. Especially when machining difficult-to-machine materials, full tool cutting should be avoided as much as possible. In actual machining, the tool life will be reduced by about 30% for each doubling of the cutting wrap angle of the tool.
In short, the parts of difficult-to-machine materials must have high hardness, high strength, high toughness and high wear resistance. For new difficult-to-machine materials with these characteristics, their machinability is poor, the machining is difficult, the machining efficiency is low, and the tool cost is high. . As a result, difficult-to-machine material components place higher demands on machining tools. OEM high quality sheet metal assembly。
