Machining process modification of YC12 series air compressor lift inhalation limiter
YC12 series piston compressors generally adopt "automatic valve*, which means that the opening and closing of the valve is realized by the pressure difference between the two sides of the valve plate. There is no other driving mechanism. The valve is mainly composed of valve seat, valve piece, spring, and liter. The process limiter and the like are important components in the reciprocating piston compressor, and are also fragile components. Its quality directly affects the compressor displacement, power consumption and operation reliability. At present, the compressor is developing at a high speed. The key issue to limit the increase in speed is the lift suction limiter, for example. 2 Traditional processing technology Traditional lift suction limiter processing is mainly processed by ordinary milling machine or by CNC milling machine. Most of the fixtures use three-jaw chuck to clamp the workpiece, and the tool uses high-speed steel cutter. Its shortcomings: d) the clamping efficiency of the three-jaw chuck is low and it is not easy to discharge during the cutting process; the cost of the Q-high-speed steel tool material is lower, but it can not carry out large feed, high Cutting speed, so that the processing efficiency is low; Q operating frequency is high, labor intensity is large. 3Technological improvement 3.1 Straight shank end mill The material of the lift hoist limiter is made of 45 steel, and the end face has 8.5 high speed steel straight shank end mill. The cutting depth is 5mm, and the cutting chip will adhere to the iron in less than 5min. On the cutter teeth, the cutting conditions are deteriorated, the milling cutter is chipped, the tool change is frequent during processing, and the efficiency is very low. It takes 40 minutes to process an annular groove; then the carbide cutter is used instead, although the performance is superior in all aspects. The former, but there is still the problem that the chips accumulate in the chip pockets, and when the machining is automatically performed on the machining center, chipping or even tool breaking occurs. Since the cost of each tool is about 200 yuan, the processing cost is extremely high, which brings great waste to the enterprise. It is difficult to find a suitable tool to replace it at a time. After analysis, it was found that the cause of iron chip jamming and chip evacuation was that the iron chips discharged in the layered cutting still remained in the annular groove. Then, can the chip removal be smoother on the original basis? If the material of the tool is changed so that it can complete the processing of the annular groove 18mm in one cutting, then it does not solve the problem of chip removal and improve the processing efficiency. Two. The geometry of the tool is then adjusted so that the shape of the tool and the shape of the tool are 10* v-shaped 3, and the arc of the groove is as smooth as possible, which is more advantageous for chip removal. The working front angle of the milling cutter is increased to about 25*, which makes the milling more brisk, but the value should not be too large, so as not to weaken the tooth strength. After cutting the workpiece with a depth of 18mm, the cutting is very smooth. No chips adhere to the cutter teeth during the whole machining process. The machining time is 20min. After the second modification, the cutting conditions are in the cutting condition. Both are superior to imported tools. The tool cost is only 100 yuan, which is 1/2 of the imported tool, and saves the tool change time, and the comprehensive processing benefits are remarkable. When the tool wears to a certain degree, the tool grinding machine can be used to improve the tool utilization from the new sharpening. The ordinary tool replaces the imported tool by the second modification, the processing speed is nearly doubled compared with the imported tool, and the production efficiency is increased by 300%. 3.2 Tooling improvement If the three-jaw chuck is used to clamp the workpiece, the three-jaw chuck is loaded. The clamping efficiency is too low and inconvenient; the use of pressure plate and bolt clamping, the use of machine-type flat jaw clamps, etc., due to the higher position requirements of the processing batch parts, the accuracy is difficult to guarantee. The parts machined on the CNC machine are divided into processes according to the principle of process concentration, that is, each process should include as much processing content as possible. The process division method is divided according to the used tool, divided by the number of installations, divided by rough finishing or divided by machining parts. In the processing of the air valve, in order to improve the machining efficiency and the mutual positional accuracy of the parts, the principle of the process concentration is arranged when the machining sequence is arranged, so as to reduce the number of tool changes and ensure the position of the parts. Therefore, the special jig 4 is designed to be clamped. When using a special fixture, it is convenient to install the fixture to the machine table. The positioning block is made at the bottom to facilitate the interaction between the fixture and the T-slot on the CNC milling machine table, so that the fixture can be easily aligned. In the internal structure, a positioning pin is added to facilitate the rapid positioning of the workpiece in the fixture. The clamping method mainly uses the screw clamping method, and the double thread is used to improve the workpiece installation without affecting the clamping force. Speed, such as. 4 Conclusion (3) The processing of the lift suction limiter is usually a large-volume production, so special fixtures should be used for clamping, and multiple processes can be processed after the secondary clamping is completed. Therefore, during the process design The principle of process concentration should be adopted to make the process as concentrated as possible, and at the same time, the number of tool changes should be reduced as much as possible to reduce standby time and improve machine utilization. This design is improved here by using a screw press, which makes the tooling less labor-saving when clamping the workpiece. When selecting a tool, Q should be considered comprehensively based on many factors such as machine tool, workpiece material and design requirements. The setting of the tool parameters should be based on the parameters improved by the tool manufacturer, and the corresponding modifications should be made according to the machining conditions, so as to maximize the Ch of the tool. Page 46, page 0. The common mode voltage is formed due to the unbalanced high-voltage harmonic generated by the inverter. Will cause high-frequency bearing current in the motor bearing, which will seriously affect the bearing life and shorten the service life of the bearing and the driven load. Therefore, an output filter must be provided at the output end of the inverter, and the power cable connected to the motor must be connected to the motor. Use shielded cable. When the conditions permit, the bearings and couplings should be replaced with insulated bearings and couplings. *Because the ZR250 air compressor controller is equipped with various detection and protection functions, in order to ensure the normal use of the air compressor after the frequency conversion, the start and stop control of the inverter and the inverter controller should be controlled by the air compressor. The machine realizes that the operator can operate the air compressor according to the normal air compressor operating program, and then can start and stop the air compressor frequency conversion fe system. 0 Since the default star-delta conversion time of the ZR250 air compressor is 15s, when selecting the inverter, ensure that the startup time of the inverter can be limited to 15 s or less, otherwise the air compressor will stop and alarm due to low oil pressure. The inverter startup failed. * The frequency conversion system should have the power frequency and frequency conversion function. Under normal circumstances, the air compressor works under the frequency conversion speed control mode. When the frequency conversion cabinet fails, it can be conveniently switched to the power frequency power supply to make the air compressor work normally to ensure the gas supply requirements of the production process. 7 Conclusion Practice has proved that for the oil-free screw air compressor to add and unload frequently operating conditions, variable frequency control technology can also be used to make the air potential. Under the premise of ensuring that the tool does not interfere with the workpiece, the length of the tool is shortened as much as possible to reduce tool vibration, extend tool life and improve machining accuracy.
Rotary tillage machine of large-higher sized box series
To adapt to the performance of agricultural machinery supporting big-power tractors, the series products adopt the enlarged square beam frame structure (10*100), ten modulus thickened gear, strengthened gantry suspension bracket, enlarged and thickened iron ball box body and thickened cutter shaft and spline shaft, of which, the cutter shaft is made ofφ80 thickened seamless steel tubes and is connected by a new type of connecting disc, and the spline shaft is the φ60 thickened spline shaft.
Located in the "Town of coal and machinery" (east of Beishou Road, North Dayu Street, Yanzhou District, Jining City, Shandong), Shandong Dafeng Machinery Co., Ltd. (hereinafter referred to as the "Company") is a manufacturer of agricultural machinery that integrates R&D, manufacturing, sale and service activities. Since 1995, the Company has 20-year history of developing and manufacturing agricultural machines and witnessed the startup and growth of China harvester market. Deep Rotary Tillage Machine,Deep Rotary Tillage Garden Machinery,Farm Deep Rotary Tillage,Deep Rotary Machine Shandong Gold Dafeng Machinery Co., Ltd , http://www.golddafengharvester.com
The Company's R&D and manufacturing focus on the corn segment. Its leading products include Gold Dafeng three-row self-propelled corn harvesters and Gold Dafeng four-row self-propelled corn harvesters, which all passed national promotion appraisal and enrolled into the list of promoted products. Meanwhile, its new generation Gold Dafeng corn harvesters have been developed and tested and ready to go on sale.
Employing more than 600 people, the Company is composed of manufacturing department, marketing department, engineering department, purchase department, process equipment department, QA department, HR department, administrative department, financial department, etc. The Company totally covers 100,000m2. Till now, the phase I and phase II, which include a 33,600m2 modern standard plant building and a 1,500m2 office building, have been completed, and their total investment was more than RMB 180 million.
The Company is very strong in high-efficiency Corn Harvester development and manufacturing. Now it has 160 sets of production equipment including advanced CNC laser cutter, CNC plasma cutter, 3D cutting robot, fully automatic flat line, welding robot, electrophoresis and vanish baking equipment and flexible assembly line, and 200 sets of test equipment such as 3D coordinate measuring instrument, dynamic balancing machine, ultrasonic flaw detector, physical and chemical lab, infrared thermometer, paint film thickness gauge, etc. In addition to these instruments, it also has a great variety of detecting means. The high R&D, production and detection strengths together ensure that the Company's high-efficiency corn harvesters are highly precise, reliable and efficient.
Always operating in line with the honest and win-win philosophy, the Company formed good partnership with its suppliers and dealers, which in turn strengthens and stabilizes its supply and completing system. Now, its supplier number is 160, of which more than 110 are professional manufacturers with high production capacity. Its sales and after-sales service networks covers all major corn production areas in China, such as Shandong, Henan, Anhui, Shanxi, Shaanxi, Hebei, Jiangsu, Inner Mongolia, Heilongjiang, Jilin and Liaoning.
In future, the Company, still following the "Grateful, Honest, Efficient, Partnership-Oriented, Innovative and Responsible" concept, will continue to focus on developing and manufacturing high-efficiency corn harvesters and strive to bring its sales to more than RMB 5 billion within the coming 5 years. Aiming at becoming the top-class professional corn harvester manufacturer in China, the Company is endeavoring to build gold quality and make great contribution to agricultural modernization. Welcome to join us for great success and bright future.