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Mold development

China's annual plastic mold output value is about 53.4 billion yuan? Do you believe it? As the rapid development of China's economy requires more and more stringent requirements for the plastic mold industry, it provides a huge impetus for the development of the plastic mold industry. Statistics show that China's annual plastic mold output value reached 53.4 billion yuan, which is an existing fact. With the rapid development of automobile manufacturing and IT manufacturing, the domestic mold industry has achieved rapid development. It is understood that the proportion of plastic molds in my country's mold industry can reach 30%. It is expected that in the future mold market, the proportion of plastic molds in total molds will still gradually increase, and the development speed will be faster than other molds. It is reported that since 2000, the mold industry has been growing rapidly at a rate of 20% per year, which has driven the improvement of mold grades. Sophisticated mold manufacturing equipment has provided a guarantee for the improvement of mold technology. The analysis believes that, due to the majority of imported molds, precision, large, complex, and long-life molds, from the perspective of reducing imports and increasing the localization rate, such high-end molds will gradually increase their market share. The rapid development of the construction industry has made various profile extrusion molds and PVC plastic pipe joint molds a new economic growth point in the mold market. The rapid development of highways has also put forward higher requirements for automobile tires, so radial rubber tire molds , In particular, the development of flexible molds will also be higher than the overall average; replacing wood with plastic and metal with plastic makes plastic molds in huge demand in the automobile and motorcycle industries; the household appliance industry will be in the "Twelfth Five-Year Plan" period There is a great development, especially the plastic molds for parts such as refrigerators, air conditioners and microwave ovens are in great demand. At the same time, the pace of structural adjustment in the plastic mold industry is accelerating, and the number and capacity of professional plastic mold manufacturers facing the market are also growing rapidly. According to the analysis of the production, sales, market situation, industry structure, products and import and export of the plastic mold manufacturing industry, with reference to the development trends of the plastic mold related industries, predict the future development direction of China's plastic mold manufacturing industry The development potential of the mold manufacturing industry needs to be verified.
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14
2018-11

Plastic mold material requirements

Time of issue: : 2018-11--14 Number of views : 0
The working conditions of plastic molds are different from cold dies. Generally, they must be operated at 150°C-200°C. In addition to being subjected to a certain pressure, they must also be affected by temperature. According to the different conditions and processing methods of plastic molding molds, the basic performance requirements of plastic mold steel are roughly summarized as follows: 1. Sufficient surface hardness and wear resistance The hardness of the plastic mold is usually below 50-60HRC. The heat-treated mold should have sufficient surface hardness to ensure that the mold has sufficient rigidity. Due to the filling and flow of plastics, the mold must withstand greater compressive stress and friction, requiring the mold to maintain shape accuracy and dimensional accuracy stability, to ensure that the mold has sufficient service life. The wear resistance of the mold depends on the chemical composition of the steel and the hardness of the heat treatment, so increasing the hardness of the mold is conducive to improving its wear resistance. 2. Excellent machinability In addition to EMD processing, most plastic forming molds also require certain cutting operations and fitter repairs. In order to extend the service life of cutting tools, improve cutting performance, and reduce surface roughness, the hardness of plastic mold steel must be appropriate. 3. Good polishing performance High-quality plastic products require a small surface roughness value. For example, the surface roughness value of the injection mold cavity is required to be less than Ra0.1-0.25, and the optical surface requires Ra<0.01nm. The cavity must be polished to reduce the surface roughness value. The steel used for this purpose requires less material impurities, uniform microstructure, no fiber orientation, and no pitting or orange peel-like defects during polishing. 4. Good thermal stability The shape of plastic injection mold parts is often more complicated and difficult to process after quenching, so it should be selected as far as possible with good thermal stability. When the mold forming process is heat treated, the linear expansion coefficient is small, the heat treatment deformation is small, and the dimensional change caused by temperature difference The rate is small, the metallurgical structure and the size of the mold are stable, and the processing can be reduced or no longer processed, which can ensure the requirements of mold size accuracy and surface roughness. Carbon steels of 45 and 50 grades have certain strength and wear resistance, and are mostly used for mold base materials after tempering treatment. High-carbon tool steel and low-alloy tool steel have high strength and wear resistance after heat treatment, and are mostly used for forming parts. However, due to its large heat treatment deformation, high-carbon tool steel is only suitable for the manufacture of shaped parts with small size and simple shape. With the development of the plastic industry, the complexity and precision of plastic products are becoming higher and higher, and higher requirements are also placed on mold materials. For the manufacture of complex, precise and corrosion-resistant plastic molds, pre-hardened steel (such as PMS), corrosion-resistant steel (such as PCR) and low-carbon maraging steel (such as 18Ni-250) can be used. Cutting performance, heat treatment and polishing performance and higher strength. In addition, when selecting materials, you must also consider preventing scratches and gluing. If there is relative movement between the two surfaces, try to avoid choosing materials with the same structure. One side can be plated or nitrided under special conditions to make the two sides have different Surface structure.
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14
2018-11

Plastic mold introduction

Time of issue: : 2018-11--14 Number of views : 0
A combined plastic mold for compression molding, extrusion molding, injection molding, blow molding and low foam molding, which mainly includes a variable cavity composed of a concave mold combined substrate, a concave mold assembly and a concave mold combined card board The concave mold is a convex mold with a variable core composed of a convex mold combined substrate, a convex mold assembly, a convex mold combined pallet, a cavity cutting component and a side cutting combined board. Coordinated change of mold convex, concave mold and auxiliary forming system. It can process plastic parts of different shapes and sizes. In the plastics processing industry, it is matched with plastic molding machines to give plastic products complete tools and precise dimensions. Due to the variety of plastics and processing methods, the structure of plastic molding machines and plastic products is also complicated, so the types and structures of plastic molds are also diverse. With the rapid development of the plastics industry and the continuous improvement in strength and other aspects of general and engineering plastics, the application range of plastic products is also expanding, and the amount of plastic products is also rising. Plastic mold is a tool for producing plastic products. It is composed of several groups of parts, and there is a molding cavity in this combination. During injection molding, the mold is clamped on the injection molding machine, the molten plastic is injected into the molding cavity, and cooled and shaped in the cavity, then the upper and lower molds are separated, and the product is ejected from the cavity through the ejection system to leave the mold, and finally the mold is closed. For the next injection, the entire injection process is cyclic. The general plastic mold is composed of a movable mold and a fixed mold. The movable mold is installed on the moving mold of the injection molding machine, and the fixed mold is installed on the fixed mold of the injection molding machine. During injection molding, the movable mold and the fixed mold are closed to form a pouring system and a cavity. When the mold is opened, the movable mold and the fixed mold are separated to take out the plastic product. Although the structure of the mold may vary due to the variety and performance of plastics, the shape and structure of plastic products, and the type of injection machine, the basic structure is consistent. The mold is mainly composed of pouring system, temperature adjustment system, molding parts and structural parts. Among them, the pouring system and the molded parts are the parts that are in direct contact with the plastic, and change with the plastic and the product. They are the most complex and the most varied parts in the mold, which require the highest processing finish and precision. The pouring system refers to the part of the flow path before the plastic enters the cavity from the nozzle, including the main flow path, the cold material cavity, the flow path and the gate. Molded parts refer to various parts that form the shape of the product, including moving mold, fixed mold and cavity, core, molding rod and exhaust port. Driven by the high-tech drive and application requirements of pillar industries, China's plastic molds have formed a huge industrial chain, from upstream raw and auxiliary materials industry and processing, testing equipment to downstream machinery, automobiles, motorcycles, home appliances, electronic communications , Building materials, and other major application industries, plastic mold development is alive. With the rapid development of China's automobiles, home appliances, electronic communications, and various building materials.
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Specializing in the production, R&D and sales of rubber products, the products involve power tool accessories, pipe seals, auto hardware accessories, and the products are exported to Japan and other countries

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