Although the gear industry is developing rapidly and there are more and more types, such as reducer spiral bevel gear, spiral bevel gear and so on, there are not many manufacturers specializing in gear mold, most of which are made by gear factory themselves, especially plastic gear in gear industry.
In terms of plastic gears, generally speaking, plastic gears and their molds are mainly distributed in two regions: Ningbo, Zhejiang Province, where there are more than 340 plastic gear factories, which is also the largest plastic gear mold production base in China; the other is Shenzhen Bao’an, which is dominated by Hong Kong funded enterprises with high product precision, which is mainly used for export. Among them, the demand for plastic gear mold is relatively large.
Throughout the current situation of gear mould in China, it can be said that there are mixed feelings. Computer gongs processing is pleased that gear mold production has a certain foundation, and the development trend of plastic gear will bring greater market space for gear mold; The worry is that there is still a gap between the level of domestic gear mould production and that of the world’s predecessors. Moreover, with the development trend of the gear industry, especially the plastic gear industry, the domestic response to market changes is not sharp enough, and the supporting research is difficult to keep up with the market demand. At present, medium and low-grade gear molds can be produced at home, and high-grade gear molds are mostly imported. The application scope of high-speed computer gongs for machining domestic gears can be roughly divided into three aspects: plastic gear mold, powder metallurgy gear mold and precision forging bevel gear mold.
It can be seen that there is still a large space for the development of China’s gear industry. Our company specializes in the production of spiral bevel gears and other products. The advanced equipment and technology ensure the quality of the products, which has been recognized by customers. Plastic gear has the advantages of low transmission noise, vibration absorption, self lubrication, high efficiency of mold processing. In recent years, the application of plastic gear in gear industry will be more and more, which will become a worldwide trend.
Domestic precision gear mould needs to keep pace with the development of world gear mould
However, at present, the middle and low-grade gear mould can be produced in China, and the high-grade gear mould mostly depends on import. There are not many factories specialized in gear mould in China, most of them are made by gear factories themselves. In the application range of gear mold, the demand of plastic gear mold is relatively large, and the market potential is huge.
Relevant experts in the industry put forward three strategies for future development
First, speed up the adjustment of industrial structure; in the future development, the gear mold industry should pay more attention to the strategic adjustment of its product structure, so as to make the high-end die with complex structure and high precision develop faster. At the same time, the mold industry should also closely follow the market demand to develop. Without product demand and product upgrading, there will be no technological progress in the mold industry, and there will be no scale and grade of mold products. The level of mold technology determines the quality, efficiency and development ability of new products to a great extent.
At present, there is neither national standard nor ready-made industrial standard for gear mold processing, especially in plastic gear mold. The technical standard is a kind of open standard, but it is very difficult to make the product standard. It is necessary to consider the test standard, precision standard and test device standard of gear mould.
Third, strengthen the density of cooperation between industries; the development of modern industry is a relationship of mutual cooperation, which is equally important for the gear mold industry. This cooperation is first of all direct cooperation in industry research. For example, several universities are engaged in the research of gear mold, concentrating the strength of gear industry and some university research institutions, and doing integrated research and cooperation in the aspects of process equipment and internal deformation law of plastics.
At the same time, from the whole industry, the voice of gear mold is very small, and it is in a spontaneous state, and the establishment of relevant professional associations is to change this situation. This is to focus on discussing and solving the problems existing in the production of small module gear, so as to promote the development of domestic precision gear mold industry.
In the trend of gear industry, especially plastic gear industry, the domestic response to market changes is not sharp enough, supporting research is difficult to keep up with the market demand, and the domestic precision gear mold still needs to keep up with the development level of the world gear mold.
Shaft gear is the most important part in the gearbox, and its machining accuracy directly affects the overall quality of the gearbox. At present, the gear tooth processing method we adopt is hobbing shaving method. In order to produce high-precision gears by hobbing and shaving, the hobbing and shaving process must be brought into full play. The shaving accuracy depends on the saddle hobbing accuracy to a large extent, so some error items in hobbing must be strictly controlled to produce high-quality gears. Gear hobbing is a common gear processing method. On the hobbing machine with high precision, gear teeth of grade 4-5 can be machined with precision hob. On the ordinary gear hobbing machine, only 8-grade precision gear teeth can be machined with ordinary precision hob. The accuracy of gear tooth of transmission shaft is required to be 8-7-7, and the positioning datum is mainly based on two center holes and end faces during gear hobbing. Therefore, it is very important to analyze the error sources of hobbing and master the methods to ensure and improve the machining accuracy.
Analysis of hobbing accuracy
The accuracy of shaft teeth is mainly related to motion accuracy, stability accuracy and contact accuracy. Common control method in Hobbing
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