What Is A Plastic Over Moulding? The main body consists of two parts, one refers to the plastic inside and the other refers to the rubber outside. The method of overmolding, hard plastic part, is the same as that of conventional plastic mold design. For the soft rubber part, the hard plastic part is molded first, and then manually put into the plastic injection, so there is no need to apply shrink rate for
Three mechanical states of plastics In nature, we divide all substances into three states of aggregation at room temperature: liquid, gas and solid. Polymers represented by amorphous linear polymers, due to the continuity of molecular structure and their huge molecular weight, their aggregation state is different from that of ordinary low molecular compounds, but under different thermal conditions, they exist in three unique forms, namely, glass state, high elastic state, and viscous flow state There
1. Injection pressure The injection pressure is provided by the hydraulic system of the injection system. The pressure of the hydraulic cylinder is transmitted to the plastic melt through the screw of the injection molding machine. Driven by the pressure, the plastic melt enters the vertical runner (also the main runner for some molds), the main runner and the branch runner of the mold through the nozzle of the injection molding machine, and enters the
What is the injection molding cycle The time required to complete an injection molding process is called the molding cycle, also known as the molding cycle. It actually includes the following parts: Molding cycle: The molding cycle directly affects labor productivity and equipment utilization. Therefore, in the production process, the relevant time in the molding cycle should be shortened as much as possible on the premise of ensuring the quality. In the whole molding cycle,
During injection molding, there will not be a lot of molten materials oozing from the vent hole, because the molten materials will be cooled and solidified there to block the channel. The opening position of the exhaust port shall not face the operator to prevent accidental ejection of molten materials from injuring people. In addition, the fit clearance between the ejector rod and the ejector hole, the fit clearance between the ejector block and the
During injection molding, there will not be a lot of molten materials oozing from the vent hole, because the molten materials will be cooled and solidified there to block the channel. The opening position of the exhaust port shall not face the operator to prevent accidental ejection of molten materials from injuring people. In addition, the fit clearance between the ejector rod and the ejector hole, the fit clearance between the ejector block and the
Injection Mold Maintenance Plan 1、 Inspection and maintenance during mold installation 1. Clean the upper and lower surfaces of the injection mold before installing the mold to ensure that the installation surface of the injection mold is correctly matched with the working surface of the press. 2. After the mold is installed, open the mold, and clean the mold guide mechanism and mold cavity surface to ensure the quality of the parts. 3. Lubricate or
Main Steps of Injection Mold Test In order to avoid unnecessary waste of time and trouble during mass production, it is really necessary to pay patience to adjust and control various processing conditions, find out the best temperature and pressure conditions, and formulate standard mold testing procedures, which are conducive to establishing daily working methods. 1. Check whether the plastic in the barrel is correct and baked according to regulations (if different raw materials
Attention shall be paid to whether there are scratches, missing parts, looseness, etc., whether the action of the die sliding plate is accurate, whether there is leakage in the water channel and gas pipe joints, and if there is a limit to the opening of the mold, it shall also be marked on the mold.
Common problems to pay attention to when designing injection mold 1、 Opening direction and parting line The opening direction and parting line of each injection molding product must be determined at the beginning of design to ensure that the core pulling slider mechanism is reduced as much as possible and the influence of parting line on the appearance is eliminated. 1. After the mold opening direction is determined, the stiffeners, buckles, bulges and other structures
Basic Principles of Injection Mold Gating System Design 1. Consideration of cavity layout 1) Balances Layout shall be adopted as far as possible; 2) The mold cavity layout and gate opening shall be symmetrical as far as possible, so as to prevent the uneven force of the mold from generating eccentric load, which may lead to the problem of mold overflow; 3) The mold cavity layout shall be as compact as possible to reduce
General process of mold design American industry believes that “mold industry is the cornerstone of American industry”; Germany regards it as a “key industry” among all industries; Japan Mold Association also believes that “mold is the power to promote social prosperity and prosperity”, is also “the secret of the entire industrial development”, and is “the driving force to enter a rich society”. General process of mold design: <1> Analyze and digest the products and samples
Function and Importance of Mold Design Mold quotation, mold design and mold manufacturing support a huge product development process. When the quotation of tooling and/or parts is required, it usually means the beginning of the conceptual design stage or the detailed design stage. In addition to materials and processes, the design of an injection mold plays a crucial role in determining the success or failure of a set of molds. In other words, if the
Reasons for gas generation during product manufacturing 1. The gas entrained by the material in the feeding system or the air in the cavity is not discharged from the runner and cavity in time during the forming process. 2. The resin is not sufficiently dry and contains water, which evaporates at the injection temperature and becomes steam. 3. The injection temperature is high, and the plastic decomposes to produce gas. 4. Some additives in the
Sharing of Process Specifications for Grinding and Polishing of Injection Mold Surface 1、 Preparation before grinding and polishing 1. The grinding and polishing personnel must be trained and pass the examination and obtain the work license before they can go on duty. 2. Specify the process requirements, materials and initial state of the workpiece, as well as the processing position, shape, size and polishing accuracy requirements of this process. 3. Before polishing, check whether the