Plastic Injection Mould is given in the molding of plastic components to shape and size. Although the structure of die varieties and performance as plastic, plastic products, as well as the shape and structure of various types of injection machines may ever changing, but the basic structure is the same. Mainly by the casting mold system, molded parts and structural parts of three parts. Gating system and forming part of which is direct contact with the plastic parts and products with the plastic and change, is the most complex modeling, the greatest change to require processing of some of the highest finish and precision.
Casting system is a plastic nozzle into the cavity from the front part of the flow channel, including the main channel, cold material points, shunt and the gate so. Forming part is the shape of various parts constitute the products, including dynamic simulation, scheduled to die and the cavity core, forming rod and the exhaust vent. Typical modeling structure as shown.
It is the Plastic Injection Mould machine nozzle connected to the shunt or the cavity of a channel. Main channel at the top is concave in order to interface with the nozzle. Import diameter should be slightly larger than the main channel nozzle diameter (O.8mm) to avoid the flash, and to prevent the two from the transition allowed the intercept occurred. Imports according to products, the size of the diameter, typically 4-8mm. Main channel should be to expand the diameter was 3 ° to 5 ° angle to flow stripping superfluous objects.
Cold material point
It is located in the main channel at the end of a hole to capture the two injection nozzle end of the cold generated between the material, thus preventing shunt or blocking the gate. Cavity if the cold material, once mixed, then by the system is easy to produce products in the internal stress. Cold material points of a diameter of about 8 1 lOmm, a depth of 6mm. In order to facilitate mold release, the bottom often borne by the ejection lever. Stripping should bar at the top of twists and turns designed to set a hook, or sinking a trench in order to successfully pulled the mainstream when stripping Road superfluous material.
It is a multi-slot mode in the main channel connecting the cavity of the channel and all. In order to melt in the cavity filled with such speed, in modeling the shunt into the arrangement should be symmetrical and equidistant distribution. Shunt sectional shape and size of the plastic melt flow, products, ease of mold release and mold making has an impact. If the same feeding amount by the movement, the Zeyi circular cross-section of the flow channel of least resistance. Cylindrical flow channel of the surface area but small, on the shunt redundant cooling material adverse, and that the shunt must be set up in two and a half model, not only cost labor and easily aligned. Therefore, often uses a trapezoidal or semi-circular cross-section of the shunt,
And opened with a stripping pole in half of the mold. Channel surface must be polished to reduce the flow resistance for faster filling rate. Flow determined by the size of plastic varieties, products, size and thickness. For most thermoplastics, the shunt does not exceed the section width of 8m, oversized up to 10 1 12m, especially the small 2-3m. The premise of meeting the needs of cross-sectional area should be reduced, so as not to increase the shunt and to extend the superfluous material cooling time.
It is connected to main channel (or shunt) and the cavity of the channel. Channel with main channel cross-sectional area (or shunt) and the same, but are usually reduced. So it is the whole flow system the smallest part of the cross-sectional area. Gate shape and size on the product quality greatly. The role of the gate: A, control of material flow rate: B, the injection can be stored in this part due to melt earlier and prevent the reflux condensate: C, to melt through the shear and elevated by the strong temperature , thereby reducing the apparent viscosity to increase liquidity: D, easy separation of products and flow systems.
Gate shape, size and location of the design depends on the nature of plastic, the size and structure of products. General shape of a rectangular cross-section gate or circular, cross-sectional area may be minor and short length should not only based on the role, but also because larger more easily small gate, and narrow the large gate is very difficult. Gate location should generally be selected in the product without affecting the appearance of the most thick and place. Gate size should be designed to take into account the nature of the plastic melt.
It is the mold in the molding of plastic products space. Used as a form referred to as forming the cavity of the component parts. Often forming part of various special name. Constitute the product shape forming part called Die (also known as yin-mode), constitutes a product within the shape (such as holes, slots, etc.) is called the core or punch type (also known as Yang-mode). When the first molded part design according to the performance of plastics, products, geometry, dimensional tolerances and use requirements to determine the overall structure of the cavity. Second, determine the structure of choice according to the parting line, gate and vent location and stripping methods.
Size of the final product according to control each part of the design and determine the combinations of different parts. When the plastic melt into the cavity of high pressure, it should be reasonably molded parts selection, and the strength and stiffness of the check. To ensure the smooth plastic surface appearance and easy stripping, where contact with the plastic surface, the roughness Ra> 0.32um, but also corrosion resistance. Molded parts are generally by heat treatment to improve hardness, and corrosion-resistant steel manufacturing use.
It is set in the mold of a trough outlet to discharge the original and melt into the gas. Melt into the cavity, the original stored in the cavity of air and gases from the melt into the material flow must be the end of the mold through the exhaust port outside the discharge, it will be to make products with a stoma, poor welding, charge Die dissatisfaction, and even accumulated due to compression of air temperature and the products produced burns. In general, discharge port located in the cavity can melt the end of the flow, but also in modeling the surface of the sub-type. The latter is set up in the die side of the deep 0.03-0.2mm, 1.5-6mm wide and shallow groove. Injection in
Vent does not have a lot of melt leakage, because the melt would solidify the channel where the cooling block. Do not open vent position facing the operator to prevent exhaust melt accident injury. Can also use the top of a pole and top with a clearance hole, the top block and off with the template and Core and gap to the exhaust.
It refers to the various parts constitute the mold structure, including: orientation, ejection, core pulling and classification of various parts. As before and after the splint, before and after the button template, bearing plate, bearing columns, orientation columns, removing the template, such as mold release lever and the return shot.
Heating or cooling device
This is to melt solidified in the mold shape of the device, the thermoplastic is generally yin and yang, the channel mold cooling medium through the cooling medium circulation to achieve cooling purposes. Access of the cooling medium with the plastic structure types and products vary, with cold water, hot water, hot oil and steam, etc.. The key is efficient uniform cooling, cooling products will directly affect the uneven quality and size. Should be based on the thermal properties of melt (including crystallization), the shape of products
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