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The development of the automobile industry drives the expansion of the automotive plastic parts market

Update:06-06-2022
Summary:Innovation in injection molding technologyThe selection of injection molding mac...
Innovation in injection molding technology
The selection of injection molding machines is very important for the molding of excellent plastic parts. Due to its own hinged structure (crankshaft) design, the early ordinary three-platen injection molding machine has limited application process scalability and many shortcomings, resulting in it being unable to meet the needs of high-precision production. The structural design of the high-precision two-platen injection molding machine just makes up for many defects of the three-platen injection molding machine, and at the same time has a number of value-added special functions, which greatly meet the injection molding needs of the mold. Take the Yizumi DP series two-platen injection molding machine from German origin as an example, its characteristics are remarkable.
High pressure slow mold opening function
For molds with strong covering force and complex structure of plastic products, the three-plate injection molding machine may not be able to open it smoothly, resulting in product strain and deformation. Open the template and then use the quick-moving oil cylinder to quickly open the mold to achieve stable and fast mold opening, effectively ensuring the quality of the product; it has excellent performance in deep cavity product molding, car lamp molding, and large product molding.
Secondary boost function
In view of the problem of unsmooth mold exhaust, high injection pressure is required for product molding, resulting in defects such as large internal stress, large deformation, unstable size, trapped air, scorching, surface atomization/air pattern, etc. HPM two-plate injection molding The unique "clamping secondary boosting" function of the machine can greatly reduce the above product defects by establishing the clamping force twice. The three-platen injection molding machine cannot realize this special function.
Large capacity modulus, large mold opening stroke, and smaller footprint
The opening and closing action of the three-plate injection molding machine is driven by the cylinder hinge type (crankshaft type), which leads to limitations in the opening stroke and capacity modulus. The large-capacity modulus is 2/3 larger than that of the three-platen machine of the same model. The space occupied by the whole machine is 1.5 to 2.5 meters smaller than that of the same model of the three-platen machine. At the same time, the two-platen machine with a larger mold opening stroke and a larger capacity and modulus can be flexibly customized according to customer needs.
A variety of synchronization functions are optional
Synchronous ejector function, template neutron linkage function, neutron free programming function, synchronous glue melting function, etc. can be selected and used as needed, which greatly shortens the molding cycle.
Considering the service life of the mold, the use of raw materials, the repeatability of injection molding, and special applications, it is recommended to use a two-platen injection molding machine with high precision, and the high added value of the two-platen precision injection molding machine has gradually replaced the three-platen injection molding machine. Affiliate ranks.
Critical Components Warranty
Injection molding machines that produce high-quality automotive plastic parts need to be equipped with imported key components.
In terms of power system, it is recommended to use a German Rexroth plunger pump with a high-response injection servo valve. The biggest advantage is that it can quickly supply stable injection pressure and injection speed, improve injection repeatability, reduce product defect rate, and reduce energy consumption. The disadvantage is that the manufacturing cost is high, which is more than 40% higher than the cost of the servo power system.
Configure high-precision plasticizing components. For example, the resins used in the production of lamp shades are generally PMMA (acrylic) and PC. These two resins have very high requirements on the design and manufacturing process of the screw, otherwise it will lead to plastic parts. Black spots or yellowing. The material tube needs to be made of alloy material, and the screw is made of alloy and surface plating treatment. The whole set of material tube group must not have dead angle in the manufacturing process, the screw surface smoothness and cleanliness requirements are high; the three small parts (screw head group) and the screw head joint must not have dead angle; the glue separation head (screw head) The clearance between the outer teeth and the inner teeth of the screw requires zero error. If the fit is not good, gas gas will cause the resin to turn yellow; Once the group has dead ends, it will lead to defective products.
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