There are two main uses for gears, one to transmit motion and the other to transmit power. At present, domestic plastic gears are mainly used to transmit motion, and the United States is now increasingly using plastic gears in transmitting power options. There are two main uses for gears, one to transmit motion and the other to transmit power. At present, domestic plastic gears are mainly used to transmit motion, and the United States is now increasingly using plastic gears in transmitting power options. Because plastic gears have the advantages of low transmission noise, vibration absorption, self-lubrication, and high efficiency in mold processing, plastic gears will become more and more used in the gear industry and become a worldwide trend. Mold is the most critical part of gear injection molding. According to Luo Baihui, the application range of gear molds can be roughly divided into three aspects: plastic gear molds, powder metallurgy gear molds and precision forged bevel gear molds. Among them, the demand for plastic gear molds is relatively large. Gears are more precise parts, and a small deviation may affect the performance of the entire gear. Plastic gear molds look simple, but they are the most complex. Factors such as gear modulus, helix angle, and hole position all affect the design of the gear mold. Accuracy and life issues are the top priority of gear mold research. At present, domestic gear molds are still in the initial stage. Generally, plastic gears with small and medium modulus are processed using molds. However, because plastic gears will undergo deformation and contraction during processing, and the accuracy of shrinkage after shrinkage, the current domestic research is not yet In-depth, this is one of the important reasons that restrict the development of plastic gear molds.
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At present, medium and low gear molds can be produced in China, and high-end gear molds rely on imports. There are not many factories specializing in gear molds in China. Most of them do gear molds by the gear factory. The gear factory often has a working section or a workshop to undertake this work. In the precision forging bevel gears, the bevel gear molds manufactured by the company, such as the gear teeth, the Jiangsu spacecraft, and the Pacific precision forging, are better in the gear mold industry, and the quality of the precision forged bevel gears is also higher. In terms of plastic gears, plastic gears and their molds are mainly distributed in two areas. One is Ningbo, Zhejiang, there are more than 340 plastic gear factories, and it is also the largest plastic gear mold production base in China. The other is Shenzhen Baoan. The main products are Hong Kong-funded enterprises with high precision and are mainly used for export.
At present, the processing of gear molds has neither national standards nor ready-made industrial standards, especially in the field of plastic gear molds. From the essence of the standard, it should be divided into technical standards and product standards. The technical standard is a relatively open standard, but the product standard is difficult to do. Consider the experimental standard, accuracy standard and test device of the gear mold. The standard and many other aspects. Therefore, the formulation of standards is not a day's work. It must be based on the expansion of the industry and the strength of the economy. When the conditions are ripe, it will be the day when the standards are introduced. Under the National Die Standardization Technical Committee, there is no standard for gear molds. This is because for mold standard researchers, most of them care about the condition of the mold, and gear is not their focus. Gear researchers and mold researchers belong to two discipline systems, which brings certain difficulties to the formulation of relevant standards. Luo Baihui, a mold industry expert, believes that effective ways to develop gear mold standards should consider cooperation between industry associations. Industry associations should Standards are established and unified. In addition to Dalian University of Technology, South China Institute of Technology and other universities in the study of gear molds, there is no special research institute to do this work. Focusing on the strength of the gear industry and some university research institutions, and doing integrated research and cooperation on process equipment and plastic internal deformation laws are urgently needed for related associations and departments. The establishment of the "Small Modulus Gear Working Committee" was to focus on and solve the problems in the production of small modulus gears. Today, the world's most advanced and complete gear mold standard is the United States, China's gear molds should learn from American standards, and gradually establish their own industry standards and national standards according to the needs of development. Specifically, it is necessary to upgrade the factory standards of some well-doing enterprises and combine them with advanced foreign standards to become China's industrial standards. This standardization of the market through standards will better promote the development of the industry.
From the perspective of the entire industry, the sound of gear molds is small and spontaneous, and the establishment of relevant professional associations is to change this situation. However, the establishment of the association is only the first step. Next, we must conduct statistical analysis on some basic conditions in the industry, formulate norms, and make plans according to the actual situation, reflect the voices of the industry to relevant departments, and promote the relevant national industrial policies. Adjustment, thus promoting the development of the domestic precision gear mold industry.
Looking at the status quo of China's gear molds, it can be described as mixed. The good news is that gear mold production has a certain foundation. The development trend of plastic gears will bring more market space to gear molds. The worry is that the level of domestic production gear molds is still some distance from the world advanced level, and especially in the gear industry. Under the trend of the development of the plastic gear industry, the domestic response to market changes is not sensitive enough, and it is difficult for supporting research to keep up with market demand.
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