Deputy General Manager and Chief Engineer of Shandong Haomai Machinery Technology Co., Ltd. Â Feng Mintang
As a vulcanization molding equipment in the complete tire production line, the tire mold is widely used in the processing of tires used in automobiles, construction machinery, bicycles, motorcycles, airplanes, etc., and the pattern, pattern, font and other appearance characteristics of the tire are molded. Depends on the tire mold. When the tire mold is used for vulcanization of the tire, the vulcanization process mainly changes the rubber from the raw rubber to the cooked rubber, and the strength, elasticity and oxidation resistance of the tire reach the use requirements, while the tire mold makes the tire have a personalized appearance and pattern. structure.
The company's EDM technology is the core technology and has precision casting and engraving technology. The company is the largest tire mold manufacturer in China and even in the world. According to the requirements of users, the complexity of the pattern and the size of the batch, the company chooses different processing techniques, and sometimes makes appropriate adjustments according to the company's equipment utilization. The EDM process is a special equipment developed by the company with independent intellectual property rights. It has advantages in processing complex patterns, cost and efficiency. Therefore, more than 60% of the company's molds are processed by EDM.
The tire is a round rotating body during work. The high-speed rotation during work has special requirements for the dynamic balance and safety of the tire. It is necessary to ensure the roundness, surface roughness, uniformity of the upper and lower molds of the tire mold and High level of geometric accuracy, etc., to ensure the dynamic balance performance, rotation accuracy and geometric uniformity of the tires produced.
The high-quality radial tire tread construction requires high precision, and the tires suitable for some special road conditions (such as snow, mountain roads, highways, etc.) have higher requirements on the structure and precision of the tread. In order to accurately and accurately implement the tire tread design through the tire mold on the tire, the design and manufacturing process of the mold is widely applied to CAD/CAM/CAE technology, and the tire tread plan is converted into the tire mold 3D parameters to complete the tire mold pattern and The digitization of the structural design, digital programming of the manufacturing process, generation of NC programs, processing by CNC machine tools. The entire design and manufacturing process is completely transmitted on the internal LAN through digital information, which requires a series of sophisticated technologies such as digital design, digital transmission, digital processing, digital inspection and management.
At present, there are three kinds of processing techniques for radial tire molds: precision casting, EDM, and CNC engraving. Each of the three processes has its own characteristics to be selected according to different situations.
Tire mold manufacturing is a very complicated process, using a lot of equipment and tooling. Here are some simple equipment:
(1) Vertical lathe, processing range is 500~5000mm, processing precision is 0.05mm.
(2) Special milling machine with a processing range of 500~1500mm and a machining accuracy of 0.10mm.
(3) Special EDM machine with a processing range of 500~1500mm.
(4) Special wire cutting machine, the processing range is 500~1500mm; the machining precision is 0.02mm.
(5) Machining center, processing range: 500~1500mm, processing precision 0.01mm.
(6) Special engraving machine tool, processing range: 500~1500mm, processing precision 0.01mm.
The company is developing a fully automatic EDM machine tool, and hopes that the accuracy of other domestic general-purpose processing equipment can be further improved to solve the situation of almost all imported high-end machine tools.
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