In industrial and municipal pipeline systems, demand for plastic bends is increasing. 90° pipe joint is a key component of pipeline. Especially in pressure pipeline, quality of pipe joints is more important, and it is difficult to obtain a high-quality and high-precision 90° pipe joint in production. Numerical simulation of shrinkage of pipe joint under different injection process parameters is carried out, and influence of injection process parameters on molding shrinkage of 90° pipe joint is obtained. Finally, three-dimensional inspection method is applied to high-precision detection of plastic parts to obtain shrinkage distribution.
We know that EDM is process of electrolytically etching off workpiece, while electrochemistry is dissolution of workpiece by electrolyte. Relatively speaking, EDM is now very popular.
Demoulding of plastic parts is the last step in injection molding process. Quality of demoulding will finally determine quality of plastic parts. When mold is opened, plastic parts must be left on half mold half with demoulding mechanism(usually on moving mold). using demoulding mechanism to pull out plastic parts.
Fan on car's fan base is designed to dissipate heat from heat sink. It includes engine cooling water pipe, water chamber, fan base, fan rotor and air conditioning radiator core. When both of them have a temperature that is too high, fan will start. Mixing with fan is noise from fan. Balance of blade rotation and flatness of fan base assembly will affect noise level of car. Car fan base is divided into integral type and split type. Split type should pay attention to roundness and profile requirements of product, while integral fan base requires flatness on the basis of roundness and profile. Only better assembly with heat sink can further reduce noise and energy consumption. Fan motor will vibrate during operation, so fan base is required to have a certain shock absorption, as shown in Figure 1: Assembly position of fan base in the car.
Injection moulding is an engineering technique that involves transforming plastic into a product that is useful and maintains its original properties. Important process conditions for injection moulding are temperature, pressure and corresponding individual time of action that affect plasticizing flow and cooling.
Introduction: Material forming method is an important part of part design, and it is also a problem that manufacturers are extremely concerned about. It is also a key factor in material processing process. Its importance is self-evident.
Pressure die casting (referred as diecast) has characteristics of high production efficiency, short production process, high smoothness and strength of castings, low machining allowance and metal material saving. In recent years, China's diecast industry has developed rapidly and its total output has grown significantly. It become already a veritable diecast country. Molds, diecast machines and diecast materials are three major elements of diecast production. Only high-quality molds can produce high-quality castings with stability and efficiency. If working environment of die casting mold is very bad: cavity is directly in contact with high-temperature, pressure, speed metal liquid phase during diecast production process, and is directly washed by molten metal, which is easy to wear, high-temperature oxidation and various corrosion. High-efficiency production periodically increased and decreased sharply mold temperature, working surface is prone to thermal fatigue cracking; when metal is forced to deform, it rubs against surface of cavity, easily wears mold and reduces its hardness. Cost of molds is high, production cycle is long, and repairs are difficult. So it is very important in terms of service life. Therefore, research on factors affecting mold performance and service life is beneficial to improve casting quality and reduce economic losses due to premature scrapping of molds. In general, factors that affect performance and service life of die casting mold include mold materials, molding design and manufacturing, surface treatment techniques, and mold specific use.
Which kinds of mold problems can be avoided during manufacturing? Pilot column damage Guide post mainly plays a guiding role in the mold to ensure that molding surfaces of core and cavity do not touch each other under any circumstances, guide post cannot be used as force receiving member or positioning member. In following two cases, movement and setting of mold will produce a huge lateral displacement force: When wall thickness of plastic part is not uniform, velocity of material flowing through thick wall is large, and a large pressure is generated therein; Side of plastic part is asymmetrical. For mold with a stepped parting surface, opposing pressures on the opposite sides are not equal.
Injection molding mold and injection molded parts are classified as one of mold manufacturing types, and precision injection molding is a newly developed segment in injection molding industry.
Design of mold cooling system is a key factor in success of mold design, which directly affects quality and production efficiency of plastic products. In injection molding process, cooling time of plastic products in cavity accounts for 50% to 60% of entire molding cycle, cooling speed and uniformity directly affect quality of product. If design of cooling system is unreasonable, it will result in a long production cycle and high cost. On the other hand, uneven cooling will also cause warping deformation of product due to thermal stress, thereby affecting product quality.