Idle boring and milling machine play a bigger role in the big gear ring processing

Idle boring and milling machine play a bigger role in the big gear ring processing - 2019 11 - 22 anmy Chen yong abstract: to improve the efficiency of large gear ring processing, reduce the processing cost, to solve the problem of our factory put forward using idle boring and milling machine, through the design special tooling, improved processing technology, to rough machining of gear ring, finally to ring gear quality requirements. In metallurgy, mining equipment, large gear ring is the key driving part, its machining precision directly affects the performance of the equipment. Study how to improve the efficiency of large gear ring processing, reduce the cost of large gear ring processing is of great significance to the enterprise. 1. Our factory big ring gear processing status quo of the recent our factory processing of large gear ring as shown in figure 1, technical parameters are as follows: 36 mm modulus, tooth number 162, tooth thickness is 380 mm, gear ring diameter of 5900 mm, 20 t of quality. Due to the delivery date is short, the use of traditional processing method is difficult to meet the time limit for a project requirements. 2. Big ring gear processing technology and existing defects I plant in the big gear ring of commonly used in machining process is: the rough turning lathe & rarr; Semi finished car & rarr; Fine car & rarr; Slotting machine coarse pinion & rarr; Semi finished gear shaper & rarr; Fine slotting & rarr; Precision gear hobbing machine and half roll tooth & rarr; Pure roll teeth. Adopting the machining process, can better guarantee the quality of large gear ring. However, the processing technology in the slotting process time consuming, and it is difficult to guarantee machining quality. This is because the slotting machine completely relies on technical workers in the process of gear shaper manual indexing, unable to accurately dividing. And processing of tool marks on the surface of the tooth is difficult to eliminate, As shown in figure 2 shown in dotted line) , these mark position and tend to produce work hardening phenomenon, brings to the process of gear hobbing machine hob after wear and larger for gear hobbing machine tool, purchase, maintenance costs are high. As a result, the traditional big ring gear processing technology become a bottleneck to improve efficiency, reduce cost. 3. Big ring gear processing technology improvement in order to solve the above problems, combining with our actual: (is put forward 1) Boring and milling machine processing technology improvement, the use of existing after slotting machine coarse gear shaper increase half precision gear milling process. Compared with gear hob, boring and milling machine tool cost is low, and can complete large turning cutting, processing efficiency significantly. According to our actual, adopt an idle boring and milling machine, gear ring for semi-finishing twice, so it can greatly reduce the number of gear hobbing machine finishing processing capacity, reduce the work pressure gear hobbing machine, reduce the gear hobbing tool wear, obtain good economic benefits. （ 2) For processing cutting tool research and development, production suitable for boring and milling machine using gear milling cutter. Through the study of this batch of big ring gear tooth, designed as shown in figure 3 machine gear milling cutter. This machine clamp type carbide finger gear milling cutter, its blade USES 40 cr, the handle and machine tool spindle hole match, making for short shank taper 7:24, heel & phi; 69. 85 mm, long slope to 47. 2 mm, cutting edge for involute tooth type, the circular uniform 4 blade and the spiral gear, such as blade grew up in the size of the tooth profile of a standard blade, blade with tungsten cobalt alloy type rigid blade. This will reduce the tool cost, ensure accuracy of machine tools, reduce the labor intensity, to solve the maximum production bottleneck, and can shorten the processing time of a half gear hobbing machine, in order to guarantee the time limit for a project. （ 3) Carry on the improvement of processing parameters, after using the new machine tools, through production practice, the processing of the following parameters: after gear shaper, machining allowance is not uniform, therefore, milling gear turning volume shoulds not be too large for the first time, shown in table 1 for the first time when gear milling processing parameters; Feed for the second time, because of the tooth profile machining allowance even, according to the actual situation of machining allowance increasing turning depth, feed rate and spindle speed, the main reference cutting parameters are shown in table 2. After such processing parameters change, at the end of the half finish machining, gear hobbing machine before finishing, can control the big gear ring manufactured in 1. 0 to 1. 5 mm, gear hobbing machine only for such a pure rolling can meet the technical requirements, as shown in figure 4. 4. Conclusion according to the factory, through the use of idle boring and milling machine, solve the bottleneck in the big gear ring production; Designed for boring and milling machine milling tooth for machine tool, and sums up the practical processing parameters. Through the improvement, to improve the machining efficiency of large gear ring, reducing the costs of large gear ring processing. By the calculation, by use of new technology, the processing each big modulus gear ring, can reduce cost about $20000. Source: the metal processing ( Cold working) 24, 2016