In terms of tools, what are the concerns of gear or gearbox processing?
Mr. Xuan Anguang: In the gear manufacturing industry, the hobbing process accounts for more than 70% of the gear making process. It is of great significance to use high-speed hobbing. In order to achieve high-speed hobbing, the hobbing machine must increase the rigidity, improve the driving power of the hobbing head, improve the numerical control, servo function, achieve temperature compensation, etc., and also promote the application of high-performance, high-efficiency tools. In terms of tools, there are fewer and fewer high-speed steel tools, and most of them use hard alloys. The hob materials currently used in production are mainly HSS, and there are also carbide insert hobs or integral powder metallurgy carbide hobs. Some tool suppliers in Germany, Sweden's Sandvik Coromant and other tool manufacturers are particularly good at adapting processing technology, especially for heavy gear machining.
The problem of recoating of coated tools is of concern to many users. Since the worn tool is being sharpened, the coating in the cutting zone of the tool is broken and recoating is required. In this respect, it is necessary to calculate whether it is economical, and also consider the influence of Co loss in the alloy in the coating stripping. Coating technology companies have mastered the technology of recoating regrind tools without peeling off the coating.
Talk about the new development of grinding technology?
In the past, the method of exhibition was used. Now, use high-efficiency forming mills. When this technology was proposed in the 1970s and 1980s, there were technical problems and could not be solved. If the entire tooth groove is in contact, it is easy to burn, and the formed spots are likely to become soft spots. The successful development of the atmospheric hole grinding wheel, the application of the large-flow cooling device and the numerical control technology on the gear grinding machine make the forming grinding become a reality. It has been difficult to grind 7 levels of precision before, and now it can achieve a maximum of 3 levels of precision. Hangzhou Gear Factory has imported more than 10 German forming grinding CNC machine tools.
In the current gear manufacturing industry, the tooth forming process of each company is roughly the same. Most of the gear processing uses hobbing, shaving and hot post-crushing technology. A few companies use hobbing and hot post-grinding, while the heavy-duty gear transmission industry generally uses a hot-rolling grinding process.
Hobbing accounts for more than 70% of the gear processing, and high-speed hobbing is of great significance. In order to achieve high-speed hobbing, the hobbing machine must increase the rigidity, improve the driving power of the hobbing head, improve the numerical control, servo function, achieve temperature compensation, etc., and also promote the application of high-performance, high-efficiency tools.
The hob materials currently used in production are mainly high-speed steel, and there are also carbide insert hobs or integral powder metallurgy carbide hobs. High-speed steel hobs are mostly coated, such as commonly used tool materials such as M35, M42, A4, TiN coating, good matrix toughness, heat-resistant and wear-resistant coating, preventing chipping, and cutting speed can be increased to 120. ~150mmin. The solid carbide hob manufactured by the powder metallurgy sintering forming method also has a good effect. The tool is coated and the cutting speed can be increased to more than 250mmin, and the axial feed can reach 3~6mmr. And as long as the equipment conditions allow, dry cut can be achieved. The use of dry cutting can reduce the environmental pollution caused by the oil mist caused by the cutting coolant, and the excellent performance of the carbide coated tool greatly prolongs the service life and reduces the processing cost.
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