0 Foreword With the development of China's manufacturing industry, twin-screw air compressors are referred to as air compressors for their excellent reliability, light weight, low vibration, low operation, easy to wear parts, and low operating efficiency. A considerable share. 1 For the twin-screw compressor assembly produced by a company. The twin-screw compressor is mainly composed of the bearing end cover of the yin and yang screw body and the sealing end cover of the shaft end. The principle of exhausting is to perform multiple exhaust processes within each revolution of the rotor, which has the characteristics of uniform pressure pulsation of the gas. However, the uniformity of the exhaust gas is ensured by the high processing precision of the body components, and the compact structure of the twin-screw air compressor ensures the power consumption. The following is a discussion of the processing scheme of the twin-screw air compressor body.
1. Exhaust end cover 2. Rod 3. End cover 4. Discharge end shaft cover 5. Process analysis of the body 1 body The mass production of the twin-screw air compressor body parts such as metering and higher machining accuracy requirements is Its reasonable use performance and 3 conclusion vertical machining center as a wide range of products with a wide range of requirements, widely used in different industries. In this paper, the design and description of the beam clamping hydraulic system of the 0-reverse, 5263 CNC double-column vertical turning and milling machining center are designed and used, and the efficiency of the 01 software on the liquid meter in the system.
Liu Youwu, Zhang Qing, Zhao Xiaosong, and so on. Thermal Error Compensation Technology of Machining Center Based on Multibody Theory Model, Journal of Mechanical Engineering, 2002, 3827130.
Fan Chaoyi, Fan Wei. The overall layout of the machining center and the analysis of the guide rail design. Mechanical design Su Shiping, Li Shengyi, Wang Guilin. Geometric error identification method of machining center based on spatial error model. Journal of Mechanical Engineering, 2, 2, 3891225.
Xie Jian, Luo Zhijun, Tian Gui, et al. Based on the brothers' three-stage multi-stage hydraulic cylinder modeling and simulation quality university Wuhan.
Responsible editor Yu Xiuwen received the date 2,903 VoI.32No.02 twin screw air compressor body processing program Wang Zengchun, the support body of the yin and yang screw support hole 8, loyalty, position, screw support hole relative to the support hole The coaxiality is small, 43, the axis of the support hole is opposite to the bottom surface, the tolerance of the verticality is 0.013, the parallelism tolerance of the two support holes is small, and the coaxiality of the intermediate support hole with respect to the screw support hole is 0.018 12,12 The vertical tolerance of the positioning pin hole relative to the bottom surface is 0.013, and the others are minor faces. The center distance of the double screw hole is 2 degrees of freedom for the outer contour with the V-shaped block as the reference, and then 1 degree of freedom is limited by the stop pin to achieve complete positioning. The positioning principle is as follows: 1. Supporting pin 2. Locking the dowel 3é“• é“• 4. Shape 2 blank selection This part is a box-like part, the structure is complex, suitable for casting blanks. The material selection is suitable for casting of ductile iron with good mechanical properties 127181.
3 The choice of the reference is to ensure the dimensional tolerance geometrical tolerance and surface roughness requirements of the double rotor hole, mainly according to the principle of the reference system, and all the processing of the rotor hole is completed by the secondary clamping. The front of the fine reference selection 3 is used as the main positioning reference. The two holes with a depth of 5mnl on the diagonal line in the plane are used as the positioning reference. The two pins on the surface limit the six degrees of freedom of the workpiece to achieve complete positioning.
13. Positioning hole 2. When the positioning surface is machined to the surface and the hole on the back surface of the reference plane, the principle of mutual reference is adopted. The end face of the hole supporting the rotor is selected as the main positioning reference, and the three degrees of freedom of the workpiece are limited. The selection of the 4 machine tool and the formulation of the machining plan are due to the high precision of the machining of the parts. The machining part includes 6 sides of the hole. If the machine tool is selected, the process is complicated and the precision is difficult to guarantee. The axis CNC machining center can be completed in only 2 steps. According to the company's restrictions, the CNC horizontal machining center of the rotary horizontal table is selected as the processing equipment.
Based on the characteristics of CNC machining, the process is based on the principle of process concentration. The processing of the front and the rear parts of the machine 1 The machine tool selects the horizontal machining center as the production equipment, the machine tool is equipped with high performance, the population is 0 touch CNC system, the main specification workbench The area is 500mmx500mm, the Z-axis stroke is 700mm, the positioning and clamping of the workpiece and the positioning of the machined workpiece are 3, the clamping is clamped by the upper end of the nut; the rough finishing of the front batch 0 hole 4 touches 16 threaded holes, the table rotates 180. rough finishing Apricot 65 holes and 6 mounting holes.
Process 2: Double-screw support hole and machining of both end faces 1 Machine tool selection Select shaft linkage horizontal machining center for production equipment, machine tool equipped with high performance, population 8; CNC system, main specification table size 63,063, 1 axis, workpiece The positioning clamping and machining positioning method 5 adopts the surface pin positioning to limit the workpiece 6 degrees of freedom. The clamping is clamped by screws with 6 screw holes on the positioning surface. The double-screw support hole of the box is the key part of the box, and its dimensional accuracy is 1 D6, the surface roughness is 6, and the machining plan of the hole in the machining manual is checked. The processing plan of the hole is Rough and semi-precision fine floating é•—, due to the high precision of the CNC machining center, the rough precision and semi-fine method can achieve the processing precision requirements. The surface roughness of the end face is 1.6, and the machining plan of the plane in the manual of the machining technician is obtained. The rough and semi-fine method of the machining plan of the plane can meet the processing precision requirements.
Following the principle of the first face and the back hole, the application process of rough coal mine machinery 20.0 plane milling in the engraving application Liu Haitao, Pi Wenshan, Jiang Hailin, Cheng Xuejin Huaiyin Institute of Technology, Jiangsu Huai'an 223003 operation subtype to achieve some engraving functions, and introduced Specific steps.
5 Programming NC programming program programming is an important task in NC machining, ideal for the workpiece, and at the same time, the function of the CNC machine tool should be properly applied and fully utilized, so that the CNC machine tool can work safely, reliably and efficiently, and produce high quality. The product. According to the CNC machining process, the machining program of the machine body can be programmed.
6 parts inspection test piece accuracy detection is a reasonable process of CNC machining process range 900mmxl500mmx800, standard ambient temperature 18, 22 feet, ambient temperature change 12 zhang 24 1 compensation temperature range 1626, 15 zhang 24 operating temperature 1045, relative humidity 90 , no condensation. The detection and positioning of the body is as reported in the inspection of the main part of the body part of the machine body. It can be seen that the process scheme can be applied to mass production of compressor body parts.
7 Conclusion In summary, the processing of complex parts requiring high precision must have various conditions. In addition to the high-quality CNC machine tools, reasonable tooling equipment, high-precision testing equipment and other hardware conditions, we must also develop an optimized processing technology. Meet the requirements of parts processing. The processing scheme of this paper is improved and optimized on the basis of practice verification and verified in production, and can complete the processing task with high efficiency and high quality. At present, the processing scheme of the above-mentioned twin-screw compressor body parts has been applied in mass production of an enterprise.
Chen Wenjie. CNC machining process and programming. Beijing Mechanical Industry Press, 2008.
Hao Rui. CNC machine tool brother. Dalian Dalian University of Technology Press, 2008.
Wei Weihan. Mechanical manufacturing base brother. Beijing Mechanical Industry Press, 1999.
To study the direction of numerical control technology, the electronic goal is redundant 6,1326., responsible editor Yu Xiuwen received date 20101009
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