Cracks often occur in the mold during the manufacturing process. This phenomenon is often a problem in the design of injection molds. The cracks are mainly due to internal or external stresses. Therefore, in order to prevent the suction cup from cracking, it is mainly through Increase the inclination angle of demolding, while maintaining the smoothness of the mold, set the exhaust groove, and increase the injection speed. In this paper, the injection mold design of the main plastic suction cup is analyzed and designed in detail, and the installation and maintenance of the mold are summarized, which improves the use efficiency and service life of the mold.
(1) Determination of the location of the parting surface The selection of the parting surface is an important part of the mold design, so this article focuses on the mold design of the suction cup structure. The design of the parting surface is often to consider that the plastic part cannot come out of the mold after being formed in the mold, so it is necessary to design the parting surface. Based on this principle, we should choose the largest contour line of the plastic part of the parting surface. Fortunately, it is on a horizontal plane, which saves materials and is convenient for transportation. Molding often needs to consider many aspects in the molding, instead of designing it alone, it must combine the shape of the plastic parts.
(2) Design of pouring system Main channel design Main channel refers to the section of flow channel between the injection molding machine nozzle and the split channel. The center of the main channel and the center of the injection molding machine nozzle are on the same straight line. The shape of the main channel is generally conical or cylindrical, with a certain cone angle. In order to facilitate cold material demolding and improve the flow rate, the shape of the main channel is generally It is conical or cylindrical with a certain cone angle. Nozzle front section, end aperture: d=Ф4mm, nozzle front spherical radius: r=18m According to the relationship between the mold main channel and the nozzle: R=r+(1～2)mmD=d+(0.5～1)mm End diameter D = 4.5mm. The surface roughness value Ra of the flow channel is 0.08 μm. 2. The design of the runner is a channel between the main channel and the gate. In multi-cavity, shunt channels are generally provided. In order to facilitate the manufacture, the die shunt channel takes a semi-circular shape and is arranged on the fixed mold base plate
