CNC technology is the basic technology and common technology of advanced manufacturing

Advanced manufacturing technology is the technical support and development trend of revitalizing traditional industries. CNC technology is the basic technology and common technology of advanced manufacturing technology. With the development of production and science and technology, CNC technology is more and more widely used in all walks of life in machinery manufacturing. In order to better improve the manufacturing quality and production efficiency of shearer products, enhance the international competitiveness of products, and better play the role of numerical control technology in the production of shearer manufacturing, it is described in the production of shearer manufacturing. , CNC technology in cutting, welding and quality control and inspection and other applications.

2 application in cutting processing

(1) Machining parts with complex shapes and high precision requirements In the structure of the shearer floating oil seal, the sealing ring between the convex curved surface of the inner ring and the concave curved surface of the outer ring is required to be equal in compression. The compression contact area is uniform to meet the sealing function, so the machining accuracy of the inner and outer ring convex and concave curved surfaces directly affects the reliability of the sealing. Programming with CNC machine tools makes it easier to ensure the accuracy of the surface and meet the requirements for the use of floating oil seals. In addition, in the planetary reducer of the shearer, the aliquot accuracy of the sub-holes of the planet carrier and the coaxiality accuracy of each row of holes directly affect the transmission accuracy and service life of the whole machine, and the planet carrier is processed on the machining center. Not only the accuracy requirements of the pattern are ensured, but also the processing efficiency is high, which is 5~8 times of the processing by the coordinate boring machine.

(2) Processing of large modulus gears In the shearer traveling mechanism without chain traction, the drive wheels (involute tooth profile) and cycloidal pin trackwheels, the parameters are all large modulus (m≥25) ) Small number of teeth (z <17). In the processing, limited by the gear processing machine and the gear cutter, it is difficult to realize the machining or contouring processing. It is easier to realize the programming with the CNC boring and milling machine, which greatly reduces the production investment and process preparation time. At present, all the gears with large modulus and small number of teeth in the coal mining machine are generally programmed by CNC boring and milling machine, and a subroutine for machining a tooth shape is programmed, and the remaining tooth shapes are processed by the angle offset or coordinate rotation programming function. The accuracy meets the requirements of use and the processing efficiency is high.

(3) The processing of “three large casings” for the processing of box parts has always been the key in the coal mining machine manufacturing industry. The processing efficiency and precision directly affect the manufacturing cycle and service life of the shearer. The structure of modern coal mining machines is mostly multi-motor "segmented yaw". There are motor mounting holes on each type of casing. The hole diameter of such holes is large and the depth is _, as shown in Figure 1, it is not MG490/920-DW. When the hole of the motor is installed in the casing of the coal machine, when machining the hole depth of 62010.2, when machining on the ordinary machine tool, first process a knife, then the worktable exits, measure the machining depth dimension, and then feed the table to the tool. Firstly, the hole depth is 62010.2 (the range of the last knives), and then the knives are arranged one by one. The X380 range of the hole depth 620 1 0.2 is well processed. It is necessary to repeatedly advance and retreat the workbench many times, and the efficiency is very low. When programming the bottom surface of the deep hole with CNC machine tool, the knife is placed on the dimension base surface and quickly positioned inside the machine to be machined. The circular interpolation function is used to cut the 620 1 0.2 into the tool once, without repeated advance and retraction, accuracy Good, processing efficiency is very high.

In addition, when processing the butt hole of the end surface of the traction shell, since the other end is the ear and the rocker arm of the cutting portion, it can only be processed horizontally. More than 20 holes are machined in the coordinate boring machine, and the machining efficiency is very low. The machining efficiency can be increased by 4 to 7 times with the CNC machine tool, and the same processing program can use the mirror function to machine the butt holes on the left and right traction casings and the intermediate casings connected to them, which is not only efficient. The accuracy is also very high.

(4) Application in tooling With the increase in the number of new products for coal mining machines, the number of new tooling tires has also increased, production investment has increased, and manufacturing cycles have been long. The use of CNC machine tool programming can replace some tire tooling, such as the use of a large number of drill tires on the casing. Reduce the design and manufacture of many tire molds. For the indispensable tooling that CNC machine tools can't replace, CNC machine tools can be used to process such tooling, which shortens the process preparation time. The full use of CNC machine tools greatly improves the processing quality, reduces the investment in production, and shortens the manufacturing cycle.

(5) In the application of high-speed cutting advanced processing technology, CNC machine tools have the equipment foundation for applying high-speed machining, especially in the case of increasingly fierce competition in the coal mining machine market, how to improve manufacturing quality and processing efficiency, and enhance competitiveness. More market share, the application of advanced manufacturing technology is the foundation.

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