Promote the application of XKA5750 CNC milling machine manual programming method and application Huang Shengquan! , Ba Xingqiang" (1. Northeast Electric Power College Jilin Jilin 132012; 2. Northeast Forestry University, Harbin 150040, Heilongjiang) CNC technology has brought revolutionary changes to the machinery industry since the emergence of the mid-20th century. The development of modern CNC technology is the current machinery The only way for technological transformation and technological upgrading of manufacturing industry is the foundation of future factory automation. The programming and operation of the CNC system of XKA5750 CNC vertical lifting table milling machine produced by Beijing No.1 Machine Tool Plant is equipped with SIEMENS810D numerical control system. Many functions of this system and other numerical control systems The system is similar and has good performance. This paper mainly discusses the manual coding method and related problems of the CNC system.

1 Programming basics and format naming of the coordinate axes and the current standard coordinate system has been adopted to promote the movement position and direction of the various parts of the machine tool are represented by coordinate axes (X, Y, Z axis), international standards (ISO ) and the Ministry of the Ministry of Standards and Standards in the machine coordinate system using the right-hand Cartesian coordinate system rule. It is the coordinate system of the vertical milling machine CNC milling machine.

The direction of the axis of the milling machine spindle is taken as the Z-axis direction while the direction away from the workpiece is the positive direction of the Z-axis. The horizontal direction is the X-axis, which lies in a plane parallel to the workpiece mounting surface; the right side of the spindle's column is measured in the positive direction of the X-axis. The direction of the Y-axis is determined by the right-hand Cartesian coordinate system rule according to the Z and X axes.

The rotary motion uses A, B, and C to indicate the direction of rotation around the X, Y, and Z axes. The right hand spiral rule is used to determine the positive direction of the positive direction of A, B, and C.

The block format used by the SIEMENS 810D CNC system is the word-address block format. The order of the words in the block is not strict. The format of the block is simple, intuitive and easy to check. Each block has several words plus preparation function words, auxiliary function words, spindle speed function words, tool function words, feed function words and other common codes. For example, N0020G90G00X100Y50 block 1 indicates a squaring action. A spindle (tool) quickly moves to the coordinate position of 'X100, Y50' in absolute position size. G90 is the absolute position size mode G00 is the fast point movement X100 Y50 is the coordinate position.

2 Programming Example There is a flat cam part as shown in the figure, which requires a finishing CNC machining of a profile with a thickness of 8 mm.

"On the 30mm hole and use this as the coordinate origin and the tool point, the programming is simple and the machining accuracy can be guaranteed.

The end face of the end mill milling cutter that promotes the application of forestry machinery and woodworking equipment has a distance away from the surface of the part. The height of the safety surface is selected by the Z50mm tool retracting method to leave the workpiece, and the straight line introduces the tangential feeding knife arc to extract the tangential retreat. Knife.

Analyze the feature points of the part pattern and the cam profile, and take the machining route for processing.

"15mm end mill (material is high-speed steel), it is necessary to consider tangential cut-in and cut-out when taking the route. In XKA5750 milling 3 conclusions to master the manual programming of CNC machine tools, a lot of practical operations must be carried out. Before programming, you should first understand the performance of CNC machine tools, and choose the workpiece coordinate system, tool, fixture and cutting amount reasonably. According to the characteristics of CNC machining, the process should be concentrated, the number of tool changes should be reduced, the idle travel route should be shortened, and the machining program should be practical. High efficiency.

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