There are still many injection molded parts for automobile lights. The more representative ones include headlight masks, headlight decorative frames (transition plates), taillight masks, ellipsoid lenses, light guide strips (plates), etc. Each product has its own processing technology characteristics. Today we will briefly explain headlight mask.
Tag: two-color injection molding
Two-color injection molding is one of the more popular advanced injection molding methods currently, providing meaningful savings potential and new design possibilities for product manufacturing. This article mainly discusses development status and trends of two-color injection molding, with a special focus on application of automotive lights.
When we are doing product structure design, in order to save assembly time of parts, or reduce impact of assembly tolerances of multiple products (which can reduce type and quantity of finished parts), we often use two parts through two-color molding, inserts injection molding is used to integrate it into one piece.
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.
When did the earliest molds appear? Facts show that humans began to use molds as early as 5,000 to 7,000 years ago. Without use of molds, it is unimaginable to produce large-scale bronze works such as large standing bronze figure, standing figure of a naked and crowned priest, and Simuwu Dafang Ding.
In recent years, with demand of consumers for personalized appearance, market has increasingly higher requirements for quality and personalized appearance of plastic products. As a technology that can simultaneously mold plastic products of different materials and colors, two-color injection molding is increasingly used in production of plastic products. Compared with traditional injection molding process, two-color injection mold can not only ensure quality of product based on appearance requirements of product, molded surface pattern is beautiful and not easy to fall off, but can also mold products with certain special functional requirements, such as one part that is transparent and the other part that is opaque, one part that requires electroplating and the other that does not, etc.
Two-shot injection molding is currently one of the more popular advanced injection molding methods, which provides meaningful saving potential and new design possibilities for product manufacturing. This article mainly discusses development status and trends of two-color injection molding, with particular emphasis on application of automotive lights.
Plastics are widely used in daily chemical packaging, medical equipment, automobiles and in daily products. This article makes a brief introduction to these plastic connection technologies. Content is for reference of friends who are engaged in product structure design:
Also called multi-color injection molding process, it refers to injection molding of two or more color materials or different materials through a mold with one or more runners. It was first represented by two-color injection molding, most of our daily contact with two-color products, such as toothbrush we use every morning and evening, handle is made of two-color injection molding, the more commonly used material for handle is PP (hard rubber) +TPE (soft rubber), TPE is the best material that blends with PP encapsulation, and soft encapsulation is to improve grip.
Plastic parts are structural designs based on industrial modeling. First, check whether there are similar products for reference, then perform a detailed functional decomposition of products and parts to determine splitting, wall thickness, demoulding slope, and gap between parts. Main process issues such as transition treatment, connection treatment, and strength treatment of parts.
Gud Mould 