Injection molding A method of producing shapes for industrial products. Products usually use rubber injection molding and plastic injection molding. Injection molding can also be divided into injection molding and die-casting. Injection molding machine (referred to as injection machine or injection molding machine) is the main molding equipment for making thermoplastic or thermosetting materials into plastic products of various shapes using plastic molds. Injection molding is achieved through an injection molding machine and a mold.
Extrusion is a processing method in which materials pass through the action between the extruder barrel and the screw, are heated and plasticized, and pushed forward by the screw, and continuously pass through the machine head to make products or semi-finished products of various cross-sections.
Rotational molding is also called rotational molding, rotary molding, rotary molding, rotational casting or rotary molding. This molding method is to first add measured plastic (liquid or powder) into the mold, and after the mold is closed, it is Rotate along two vertical rotation axes and heat the mold at the same time. Under the action of gravity and heat energy, the plastic raw material in the mold is gradually and evenly coated, melted and adhered to the entire surface of the mold cavity, and formed into the same shape as the mold cavity. , and then through cooling, shaping, and demoulding to obtain products of the desired shape.
Blow molding, also known as hollow blow molding, is a rapidly developing plastic processing method. The tubular plastic parison obtained by extrusion or injection molding of thermoplastic resin is placed in a split mold while it is hot (or heated to a softened state). After the mold is closed, compressed air is immediately introduced into the parison to blow the plastic parison. It expands and adheres closely to the inner wall of the mold. After cooling and demoulding, various hollow products are obtained.
Blister molding is a plastic processing technology. The main principle is to heat a flat hard plastic sheet to soften it, then use vacuum to adsorb it to the surface of the mold, cool it and form it. It is a technical process used in all walks of life.
Compression molding, also known as compression molding or compression molding, is an operation in which powdery, granular or fibrous plastic is first placed into the mold cavity at molding temperature, and then the mold is closed and pressurized to form and solidify. Compression molding can be used for both thermosets, thermoplastics and rubber materials.
Calendering molds the molten and plasticized thermoplastic plastic through the gap between two or more parallel counter-rotating rollers, so that the melt is extruded, stretched and stretched by the rollers to become a continuous sheet product with certain specifications and quality requirements. Finally, it is formed by natural cooling. The calendering process is commonly used in the production of plastic films or sheets.
Foam molding is a process in which appropriate foaming agents are added to foam materials (PVC, PE, PS, etc.) to create a microporous structure in the plastic. Almost all thermosets and thermoplastics can be made into foams, and foam molding has become an important category in plastic processing.
Microfoaming technology flow chart
The winding molding process is to wind continuous fibers (or cloth tapes, prepreg yarns) soaked in resin glue onto a mandrel according to a certain rule, and then solidify and demould to obtain the product.
Laminated molding refers to a molding processing method that combines multiple layers of the same or different materials into a whole under heating and pressure. Commonly used in plastic processing, but also in rubber processing.
Coating molding is a process that uses plastisol or organosol to coat the surface of a substrate such as cloth or paper to make imitation leather products, varnished cloth or plastic wallpaper, or to coat powdered plastic on a metal surface. Common plastic-coated products include artificial leather, varnished cloth, plastic wallpaper and various metal-coated products.
Cast molding is a method of plastic processing. In early casting, liquid monomer or prepolymer or polymer was injected into the mold under normal pressure, and after polymerization and solidification, it became a product with the same shape as the inner cavity of the mold. Nylon monomer casting and polyamide appeared in the 1960s. With the development of molding technology, the traditional casting concept has changed. Polymer solutions and dispersions (polyvinyl chloride pastes and melts) can also be used for casting molding.
Drop molding technology utilizes the state-changeable characteristics of thermoplastic polymer materials, that is, it has viscous fluidity under certain conditions and can return to solid state at room temperature, and uses appropriate methods and specialized tools to spray ink on it. It is molded into the designed shape as required under the viscous flow state, and then solidified at room temperature.
Cold press molding is a type of compression molding. Different from ordinary compression molding, the material is pressurized and molded at normal temperature. After demoulding, the molded product can be cured by heating again or by chemical action.
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Compression molding is mainly used in the production of thermosetting plastic products. After molding, it is heated to melt, pressurized and punched, then heated and cross-linked to solidify, and the finished product is obtained after demoulding.
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Resin transfer molding is a process in which resin is injected into a closed mold to infiltrate reinforcement materials and solidify. This technology eliminates the need for prepregs and autoclaves, effectively reducing equipment costs and molding costs.
This technology has developed rapidly in recent years and has been widely used in the aircraft industry, automobile industry, shipbuilding industry and other fields. It has researched and developed various branches such as RFI, VARTM, SCRIMP and SPRINT to meet the application needs of different fields.
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Extrusion is a pressure processing method that uses a punch or punch to pressurize the blank placed in the die to cause plastic flow, thereby obtaining a part corresponding to the shape of the die's hole or concave and convex die. During extrusion, the blank generates three-dimensional compressive stress, and even the blank with low plasticity can be extruded.
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Thermoforming is a special plastic processing method that processes thermoplastic sheets into various products. A more special plastic processing method that processes thermoplastic sheets into various products. The sheet is clamped on the frame and heated to a softened state. Under the action of external force, it is pressed close to the mold surface to obtain a shape similar to the mold surface. After cooling and shaping, the product is finished after trimming.
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Hand lay-up molding, also known as hand-pasted molding and contact molding, refers to manual work on the mold coated with release agent, that is, laying the reinforcing material while applying resin to the required thickness of the plastic product, and then curing and This process is used to obtain plastic products by demoulding.
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Laser Rapid Prototyping (LRP) is a new manufacturing technology that integrates advanced technologies such as CAD, CAM, CNC, laser, precision servo drive and new materials. Compared with traditional manufacturing methods, it has: high prototype replicability and interchangeability; manufacturing process has nothing to do with the geometry of the prototype; short processing cycle and low cost, with general manufacturing costs reduced by 50% and processing cycle shortened by more than 70%; highly Technology integration to achieve integration of design and manufacturing.
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Fused Deposition Modeling (FDM), this process extrudes filamentary materials such as thermoplastics, wax or metal fuses from a heated nozzle, and follows the predetermined trajectory of each layer of the part to fix it. rate for melt deposition.
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CNC computer numerical control machine tool is an automated machine tool equipped with a program control system. The control system can logically process programs with control codes or other symbolic instructions and decode them to make the machine tool move and process parts.
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3D printing (3DP) is a type of rapid prototyping technology. It is a technology that uses adhesive materials such as powdered metal or plastic to construct objects by printing layer by layer based on digital model files. 3D printing is usually achieved using digital technology material printers. It is often used to make models in the fields of mold manufacturing, industrial design and other fields, and is gradually used in the direct manufacturing of some products. There are already parts printed using this technology.
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There are many different technologies for 3D printing. They differ in the way materials are available and in building, creating parts in different layers. Commonly used materials for 3D printing include nylon fiberglass, polylactic acid, ABS resin, durable nylon materials, gypsum materials, aluminum materials, titanium alloys, stainless steel, silver plating, gold plating and rubber materials.
