Due to rapid development of 3D printing technology, designers can use 3D metal printing to design more in line with requirements of oil circuit, which can be close to contour of product when designing, so as to solve dead angle and heat accumulation of product. The more complex geometric shape of product will be more obvious, and this type of waterway design is usually called Conformal Cooling. Using 3D metal printing to make heating oil circuit will effectively reduce heating time and evenly give mold heat. Reduction of heating time can shorten the entire production cycle and increase production efficiency; evenly giving mold heat can make temperature distribution in mold more even, so as to avoid warping. Therefore, heating oil circuit is made by 3D metal printing to effectively improve above two points, thereby achieve purpose of reducing heating time and improving product quality.
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Elastic support plastic part of a bumper rack tray is shown in Figure 1, which is composed of two parts of tubular features: a tube structure with inclined holes and a tube structure with a spiral pattern on outer wall. Centerline of inclined hole forms a certain angle with centerline of bell mouth. Length of plastic part is 156 mm, width is 36 mm, and thickness is 30 mm. Average wall thickness is 1.8 mm. Plastic part is made of engineering plastic ABS with a shrinkage rate of 0.5 %~0.65%.
Complex structure of molded plastic part needs to design a special demoulding mechanism. Requirements of these demoulding mechanisms are to not only make molded plastic part demould smoothly, but also make demoulding action reliable, and mold structure should be simplified as much as possible. When determining parting surface of a molded plastic part, parting surface that can simplify mold structure and allow plastic part to be demolded should be selected first. For tube position structure of three different demoulding directions on breast shield shown in Figure 1, one of them is an internal thread cap, bottom of internal thread cap has a round tube and a small hole, and its demoulding structure complex. In order to simplify mold structure for forming plastic part, selected main parting surface is located in the middle of three pipe positions on plastic part, and all three pipe positions are demoulded by side core pulling mechanism.
In injection molded products, local stress state is different everywhere, and degree of deformation of product will be determined by stress distribution. If product is cooling. In presence of a temperature gradient, this type of stress will develop, so this type of stress is also called "forming stress".
Product of external bracket of imager is shown in Figure 1. Maximum dimensions of product are 213.00 mm * 148.95 mm * 41.28 mm; average thickness of plastic part is 3.00 mm, material of plastic part is ABS, shrinkage rate is 1.005, and weight of plastic part is 122.76 grams. Technical requirements for plastic parts are that there should be no defects such as peaking, underfilled injection molding, flow lines, pores, warping deformation, silver streaks, cold material, and jetting lines, and meet ROSH environmental protection requirements.
Injection mold is a metal model tool for producing plastic products by injection molding process, it is also a tool for giving plastic products complete structure and precise dimensions. Injection process is to inject molten material into mold cavity through high pressure, obtain plastic products after cooling and solidification. According to its molding characteristics, it can be divided into thermosetting plastic molds and thermoplastic plastic molds. Although structure of injection mold is varied due to variety and performance of plastic, shape and structure of plastic product, type of injection molding machine, basic structure is same. A complete injection mold is divided according to structural parts and component functions, mainly consisting of mold base system, gating system, ejection system, demoulding system, cooling system, hydraulic system, electrical system, exhaust system, lifting system and other systems. Each system complements each other, only when each system achieves the best combination can normal use of mold and precision of molded product be guaranteed.
Figure 1 shows an automobile air-conditioning damper. Plastic part is a plate-shaped structure with hinges and bevel gears. The overall size is 74 mm*45 mm*13 mm, and material is ABS (acrylonitrile-butadiene-styrene). After molding, exterior of plastic part is covered with TPU (thermoplastic polyurethane elastomer), ABS has medium fluidity, and molding shrinkage rate is 0.5%.
Scrap is essentially inverse image of formed hole. That is, same parts in opposite positions. By checking scrap, you can tell if upper and lower die clearances are correct. If gap is too large, scrap will have a rough, undulating fracture surface and a narrow bright band area. The larger gap, the larger angle formed by fracture surface and bright band region. If gap is too small, scrap will exhibit a slightly angled fracture surface and a broad bright band area.
Polycarbonate is a thermoplastic resin containing -[ORO-CO]-links in main chain of molecule. According to different ester groups in molecular structure, it can be divided into aliphatic, cycloaliphatic, and aliphatic-aromatic types. Among them, aromatic polycarbonates are of practical value, and bisphenol A polycarbonate is important, molecular weight is usually 30,000-100,000.
Q 1. Manual operation is normal. In semi-automatic mode, you have to wait until mold opening is terminated before opening door. Thimble can be ejected, but ejector cannot be ejected before opening door. A 1. Is it an imported machine? There is an interlocking device, just change mode to Asian mode. 2. An error occurred in computer program.
Gud Mould 