Gas-assisted injection molding car handle
Gas-assisted injection molding, also known as gas injection molding, is a new injection molding process. It is one of the most important developments in the injection molding industry since the advent of reciprocating screw injection machines. Gas-assisted injection molding is an extension of injection molding. It is developed on the basis of injection molding technology and structural foam injection molding; it can also be considered as a combination of injection molding and hollow molding. In this sense, it can also be called "hollow injection molding". Its principle is to use relatively low-pressure gas to replace the resin pressure in the cavity during the original injection molding pressure holding stage. Gas-assisted injection molding can be achieved by adding a gas supply device to the existing injection molding machine. The gas supply device consists of an air pump, a high-pressure gas generator, a gas control device and a gas nozzle. The gas control device uses a special compressor to continuously supply gas, and uses an electric control valve to control the pressure to keep constant. There are usually 3 levels of pressure. A set of gas control devices can be equipped with multiple injection molding machines.
The gas generally used is nitrogen. The gas pressure and gas purity are determined by the molding material and the shape of the product. The pressure is generally 5~32MPa, with a maximum of 40MPa. During each injection, high-pressure gas is injected from the gas nozzle at a set pressure. One or more gas nozzles are installed on the nozzle of the injection molding machine, the runner or the cavity of the mold.
It can form thick and thin-walled composite plastic parts that are difficult to process with traditional injection molding, reduce the number of parts in the assembly structure, thereby reducing the demand for molds, assembly lines and labor, and saving production costs. The required injection pressure is small. On the one hand, a small-sized injection machine can be used to form large products. On the other hand, the mold material can be replaced by aluminum alloy instead of alloy steel, thereby improving the processing performance and thermal conductivity of mold parts and reducing mold costs. After the plastic parts are hollowed out by gas-assisted injection molding, the weight can be reduced, materials can be saved, and the molding cycle can be shortened. The residual stress of the plastic parts after demolding is small, the warping deformation is small, and the dimensional stability is good.
Gas-assisted technology provides possibilities for many parts that could not be injection molded by traditional processes. It is particularly suitable for making the following injection molding products: tubular and rod-shaped parts, such as the left side adjustment lever of the steering wheel, car door handles, car wipers, rings, hooks, seat armrests, window frames, etc.; large flat parts, such as door panels, car exterior trim, radiator grilles, etc.; parts with complex shapes, uneven thickness, and difficult to form by traditional injection molding, such as car bodies, bumpers, dashboards, etc.
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