Analysis on the technical status of gear hobbing a

With the development of gear processing technology in recent years, gear materials, gear cutter manufacturing and gear grinding wheel technology have been improved, and gear machine tools have greatly improved the precision and machining efficiency of finishing gears. The speed is beyond imagination. Moreover, the development direction of gear manufacturing involves not only mature European and American markets, but also the rapidly developing markets represented by China

how far can the traditional high-speed steel hob and wet cutting technology go

the driving effect of cemented carbide hobs and dry cutting is obvious to all. For mass production of gear assembly line, can high-speed steel hobs be replaced by carbide hobs? Has dry cutting become the only way for gear hobbing, or will it still take the road of wet cutting

cemented carbide hobs promote the extension and development of end products such as fine chemicals and textiles, although they are particularly suitable for hobbing automotive gears. However, the application of cemented carbide hobs in Europe is still not high, because with the development of new high-speed steel materials and high-performance tool coating technology, the difference in gear hobbing time between cemented carbide hobs and high-speed steel hobs can be controlled at about 15%; The price of cemented carbide hobs is high. If the number of gear workpieces is not enough, the cost of using cemented carbide hobs will be very high; Moreover, special care should be taken when using cemented carbide hobs, and the hobbing parameters and corresponding hobbing programs should be carefully compiled. Only modern hobbing machines can use cemented carbide hobs to Hobbe correctly, and huge investment is needed to update the hobbing equipment. As far as samputensili is concerned, about 25000 hobs are produced every year, of which cemented carbide accounts for only about 3%. That is to say, the annual production of cemented carbide 1. Volume effect hobs is up to 750

gear dry cutting is another matter. Due to environmental protection requirements and the high cost of treating cooling waste liquid, users in Europe, the United States and Japan generally consider dry cutting hobbing when choosing; In developing countries such as China and India, although pollution control is also an urgent requirement, it requires a variety of strain gauge pull and pressure sensors at home and abroad for a long time. Once the society controls the pollution problem more and more strictly, the gear dry cutting processing will also develop rapidly

which kind of gear finishing is more popular

for gear finishing, between shaving and grinding, which kind of gear finishing is more popular

first of all, we should distinguish one industry from another. For example, the vast majority of gears used in the automotive industry also rely on shaving. Some enterprises also grind the rear transmission gear, just to eliminate any deformation on the ring cylindrical gear

the reduction of gear processing time mentioned above is mainly due to the development of new gear cutting tools and modern gear machine tools, as well as the sharp reduction of finishing allowance and the improvement of gear quality before grinding. In addition, compared with gear grinding machine, modern CNC gear shaving machine is often twice the price, and can obtain high-precision gear grade (up to DIN grade) before heat treatment; Moreover, compared with the grinding of gear thread grinder, the machining cycle is also shorter

for gears in the automotive industry, especially those used in automatic transmissions, we can control the deformation caused by post shaving heat treatment within a few microns; In addition, the modification of tooth profile and tooth direction is helpful to compensate the deformation. Due to the emergence of modern razor blade mills, such as the S400 GS produced by samputensili company, the two parameters of tooth shape and tooth direction can be quickly and simply modified; In mass production, shaving has many advantages over grinding. Comparatively speaking, shaving can ensure the quality and the price is reasonable

new technology for batch production of gears

the quality requirements of gears are higher and higher, and the requirements for speed change noise are lower and lower. In order to achieve the dual goals of quality and noise, it requires gear processing with higher accuracy to achieve extremely complex gear tooth direction and tooth shape, in order to minimize the error of variable speed transmission. This means that in the future, grinding is still the main method of gear mass production, and gear grinding may be more widely used. But pay special attention to the unit cost of gear processing. So far, the benefits of shaving with low cost and great efficiency are obvious. When grinding is successful in gear finishing, shaving can be replaced by it on a large scale. In short, no matter which gear processing method you choose, you should pay more attention to the actual use

in view of the considerable development of gear hobbing, it is likely that the high accuracy obtained after gear hobbing will no longer require shaving. The further development of gear sintering technology has also made great contributions to gear manufacturing, but this method is currently in its infancy, and it is difficult to accurately predict the future development trend

as mentioned above, although the development of gear processing technology has changed greatly, the unit processing cost of gears will certainly not change. In the mass flow production line, the adjustment of gear processing structure should be guided by this parameter. The development of new technology is of great benefit to the improvement of quality and accuracy. With the refinement of gear product technology, the requirements for these two key elements are becoming more and more strict. Although it is very difficult to meet such high requirements, we must also pursue high standards. However, it is not enough to focus on high indicators. We should pay more attention to achieving the standard of low price and good quality. Otherwise, no matter how good the new gear technology and new functions are, they will not be welcomed by the market, and the development level of gear technology will not be further improved. In industries with high technology content, the trend of precision technology and reasonable price should coexist at the same time

Mirko rampani of Shangyou machine tool (Shanghai) Co., Ltd. (e Nike makes efforts in many aspects from the product itself, the production mode of the product and the business operation mode nd)