Design steps of injection mold

The injection mold is mainly composed of molding parts (parts related to the movable and fixed mold parts), the pouring system (the channel through which the molten plastic enters the mold cavity from the injection machine nozzle), and the guiding part (when the mold is closed) It can be accurately aligned), push-out mechanism (the device that the plastic is pushed out from the cavity after the mold is parted), the temperature adjustment system (to meet the requirements of the injection process for the mold temperature), and the exhaust system (the The air and the volatilized gas of the plastic itself are discharged out of the mold, and exhaust grooves are often set on the parting surface) and supporting parts (used to install fixed or supporting molded parts and parts of other mechanisms), and sometimes there are lateral Parting and core pulling mechanism.
    Design steps of injection mold
    1. Preparation before design
    (1) Design task book.
    (2) Familiar with plastic parts, including its geometry, requirements for use of plastic parts, and raw materials of plastic parts.
    (3) Check the molding process of plastic parts.
    (4) Clarify the model and specifications of the injection machine.
    2. Develop a molding process card
    (1) Overview of the product. Such as sketch, weight, wall thickness, projected area, external dimensions, undercut and inserts.
    (2) Overview of the plastics used in the product. Such as product name, model, manufacturer, color, dryness.
    (3) The main technical parameters of the selected injection machine. Such as the relative size, screw type and power between the injection machine and the installation mold.
    (4) Pressure and stroke of the injection machine.
    (5) Injection molding conditions. Such as temperature, pressure, speed, clamping force, etc.
    3. Design steps of injection mold structure
    (1) Determine the number of cavities. Conditions: Maximum injection volume, clamping force, product accuracy requirements, and economy.
    (2) Select the parting surface. It should be based on the principle of simple mold structure, easy parting without affecting the appearance and use of plastic parts.
    (3) Determine the layout plan of the cavity. Use a balanced arrangement as much as possible.
    (4) Determine the pouring system. Including main runners, runners, gates, cold slug holes, etc.
    (5) Determine the demolding method. Different demoulding methods are designed according to the different parts of the plastic part left in the mold.
    (6) Determine the structure of the temperature control system. The temperature control system is mainly determined by the type of plastic.
    (7) When it is determined that the concave mold or core adopts the insert structure, the propositional division of the inserts and the inserts at the same time, the workability and the installation and fixing methods.
    (8) Determine the type of exhaust. Generally, the exhaust can use the mold parting surface and the gap between the ejection mechanism and the mold. For large-scale and high-speed injection molds, corresponding exhaust forms must be designed.
    (9) Determine the main size of the injection mold. Calculate the working size of the molded part according to the corresponding formula and determine the side wall thickness of the mold cavity, the thickness of the cavity bottom plate, the core backing plate, the thickness of the movable template, the thickness of the cavity plate of the block cavity and the closing height of the injection mold .
    (10) Use standard mold bases. According to the designed and calculated main dimensions of the injection mold, choose the standard mold base of the injection mold, and try to choose standard mold parts.
    (11) Draw the structural sketch of the mold. Drawing a complete structural sketch of an injection mold and drawing a mold structure diagram is a very important job in mold design.

In the meantime, the tool magazine of the machine tool becomes smaller, which inevitably improves efficiency.
     Judging from the current situation, some units have introduced thousands of new automated machine tools, but few have the spindle speed greater than 10000r/min. The reason is that there is a doubt about high-speed machining. According to the introduction of the German DMG company, the life of the high-speed spindle provided by the company is 2 years, and the key is how to apply it reasonably. When discussing the introduction of equipment, almost all hope to introduce high-speed equipment, which also reflects the mentality of technicians.
     Mikron believes that there is no strict definition of high-performance cutting. However, in actual applications, although both high-speed cutting and high-performance cutting milling methods belong to the scope of high-performance cutting technology, high-speed cutting is in most cases , Is significantly different from high-performance cutting. High-speed cutting is only one aspect of high-performance cutting, and another factor that high-performance cutting pays attention to is metal removal rate. This is a problem that we need to consider when we introduce equipment.