Gutter is drainage system of car. Its mesh structure has function of guiding rainwater and blocking debris. The overall dimensions of this plastic part are 1430mm * 429mm * 125mm. It is a two-color plastic part, as shown in Figure 1. Main material Use PP+TD22, and mesh material uses PP+EP-DM+TD22. Compared with main material, material added to mesh, EPDM ethylene propylene diene rubber, is a copolymer of ethylene, propylene and a small amount of non-conjugated diene. Main chain is composed of chemically stable saturated hydrocarbons, so it has excellent ozone resistance, heat resistance, weather resistance, aging resistance and other properties, is widely used in automotive seals and other fields. If this sink gutter is formed using a traditional flat rotating two-color mold, mold volume will reach 2150mm*2200mm*1074mm, and a 3.3×104kN rotating two-color injection molding machine will be used. However, customer company's ordinary injection molding machine with a maximum capacity of 1.3*104kN was transformed into a double-barrel injection molding machine with a rotating mold plate in the middle. In order to adapt to customer's machine production, a three-dimensional rotating laminated two-color injection mold structure scheme was selected, which consists of 2 pairs of molds. Volume of a single pair of molds is 1230mm*2200mm*1074mm. The two molds are stacked vertically on injection molding machine, and intermediate code mold plate can be rotated 180° to exchange cavity, as shown in Figure 2. Difficulty of mold design in this scheme is low. One mold injects main body of plastic part, and the other mold injects mesh of plastic part. Fixed mold cavities of two molds are different, and movable mold is exactly same. Cavity conversion is realized by rotating movable mold through intermediate code mold plate of injection molding machine. Mold structure is designed to be compact to control mold size within applicable range of selected injection molding machine.
Tag: two-color plastic part
Electric shaver battery cover product is shown in Figure 1. Maximum external dimensions of product are 50.67 mm * 47.62 mm * 12.00 mm, average thickness of plastic hard glue is 2.00 mm, base material of hard plastic is ABS, shrinkage rate is 1.005, weight of hard plastic is 4.38 grams. Soft rubber is TPE. Technical requirements for plastic parts are that there shall be no defects such as peaks, underfilling, flow lines, pores, warpage deformation, silver lines, cold materials, and spray lines.
Electric shaver battery cover product is shown in Figure 1. Maximum external dimensions of product are 50.67 mm * 47.62 mm * 12.00 mm, average thickness of plastic hard glue is 2.00 mm, base material of hard plastic is ABS, shrinkage rate is 1.005, weight of hard plastic is 4.38 grams. Soft rubber is TPE. Technical requirements for plastic parts are that there shall be no defects such as peaks, underfilling, flow lines, pores, warpage deformation, silver lines, cold materials, and spray lines.
Translational two-color injection mold for upper cover of automobile front wall was successfully tested. Plastic part samples were tested by three-coordinates of national testing laboratory and verified by automobile OEM. Appearance, size and accuracy of plastic parts all meet loading standards. Successful development of this mold can completely replace imported molds and realize localization of such plastic parts.
Gud Mould 