Steel bonded carbide tool manufacturing process is different from the ordinary high-speed steel and carbide cutting tools, has a certain particularity, the following elements of the processing.
Steel bonded carbide blank hardness 32 ~ 35HRC, carbide ingredients for WC, cutting dosage should go slow small knife volume and greater depth of cut, tool material should be selected YG class grades better to YG8N.
High speed steel milling cutter and milling of the drill trench and edge back to the standard type can be used, but the selection of the cutting parameters should be lower than the processing of ordinary high-speed steel drill (about 2/3). The cutting fluid should not be used in the process, because milling produces chips are generally easy paste, mixed with cutting fluid will aggravate the tool wear debris.
Diamond blade grinding steel bonded carbide drill better diamond or silicon carbide grinding wheel, cutting wheel should always be trimmed to keep the grinding wheel edge sharp blade annealing or easy to make, sometimes due to the grinding radial force over large, and even make the tool butt at the break.
Steel bonded carbide drill head and shank (40Cr) the difference between the thermal conductivity of the material, such as high-speed steel tool butt welding process still can not guarantee the quality of butt, before this butt the 40Cr shank should be first heated , then quickly placed on the welder and steel bonded carbide rods with butt.grinding wheel
3.5 Heat Treatment
The heat treatment of steel bonded carbide drill is an important part of ensuring the quality of the drill bit. Quenching temperature of the tool hardness, such as quenching temperature> 1260 ° C, there will be metal precipitates tool hardness and strength greatly reduced; such as quenching temperature <1180 ° C, it is difficult to guarantee a bit hardness requirements. The test results show that the optimum heat treatment parameters: 1200 1230 ℃ quenching, 560 ° C three times tempering.
Our the tool industry independent research and development and innovation capability compared with foreign countries there is a big gap
First, carbide grade as the main tool material development and foreign products have a larger gap, the impact on the overall cutting levels improve. Currently, only Zhuzhou Diamond Cutting Tools Co., Ltd., Zigong Cemented Carbide Co., Ltd, Chengdu Tool Research Institute and a few individual unit grades performance of foreign products, and the the new grades innovation and upgrade slow, our wide range of large general machining industry cutting levels are generally at a low speed, inefficient state.
In coating technology, in addition to Chengdu Tool Research Institute developed a coating technology and equipment, we lack basic theoretical research, and the lack of development of application technology and equipment industry basically take the imported equipment, the introduction of a technology road.grinding wheel
Third, the tool structure innovation, is basically empty, our original tool products, it is difficult to find in the last year, the CIMT 2005 International Machine Tool Exhibition. The reason is also the main body of the tool industry in China is still in the mode of production of traditional standard tool. Universal standard tool of production output value still account for the vast majority of the major tool company.DC wheel
The backwardness of our cutting technology and tool, also reflected in the structure of the tool industry in China, the only individual in our tool company really has two core technologies of carbide tool materials and coatings, most tool factory lack of carbide materials item core technology, some Tool Factory introduction of coating equipment, but does not have the ability to develop, restricting tool company further expand and strengthen.