Classification of plastic Moulds
The injection molding refers to the heat-melted material from high-pressure injection mold cavity, after cooling and curing, to obtain the method of forming products. This method is suitable for mass production of complex shape parts, and is an important processing method of injection molding process can be divided into the following 6 stages of mold injection and pressure-cooling open mold products removed from the process repeatedly, you can continuously produce products.
The so-called mold (Mold) refers to the resin material into the metal model after the production of a certain shape of the device. Other information plastic mold, is the plastic processing industry and plastic molding machine matching, give plastic products to complete configuration and precise size of the tool. Because of the variety of plastic and processing methods, plastic molding machine and plastic products, the structure of different simplified, so the type and structure of plastic mold is also diverse. A modular plastic mold for moulding, extrusion, injection, blow moulding and low foaming, it mainly includes the mould composed of the concave die combination base plate, the concave module part and the concave die combination card board, and the concave mould with variant cavity, by the convex module combination base plate, the convex module, the convex mould combination card board, A convex mold with a variant core composed of a cavity truncated assembly and a side-section composite plate. Coordinated change of die convex, concave die and auxiliary molding system. Machinable different shapes, different sizes of the series of plastic parts. Plastic processing industry and plastic molding machine matching, give plastic products to complete configuration and precise size of the tool. Because of the variety of plastic and processing methods, plastic molding machine and plastic products, the structure of different simplified, so the type and structure of plastic mold is also diverse. With the rapid development of plastics industry and the continuous improvement of general and engineering Plastics in terms of strength and precision, the application scope of plastic products is also expanding, and the proportion of plastic products is increasing rapidly. A well-designed plastic piece often replaces a number of traditional pieces of metal. The amount of plastic products is also rising. Plastic mold is a tool for the production of plastic products. It consists of several sets of part parts, this combination has a molded cavity. When injection molding, the mold is clamped on the injection moulding machine, the molten plastic is injected into the mold cavity, and the mold is cooled in the cavity, then the upper and lower modes are separated, and the products are removed from the mould cavity by the ejector system, Finally, the mold is closed for the next injection, and the whole injection process is recycled. According to the different molding methods, can be divided into the corresponding different technological requirements of plastic mold plastic die type, the main injection molding die, extrusion molding mold, blister molding mold, high foam polystyrene molding mold.
Plastic injection (plastic) mold It is mainly used in the production of thermoplastic parts of the most common type of mold, plastic injection molding mold corresponding to the processing equipment is plastic injection mold corresponding to the processing equipment is plastic injection molding machine, plastic first in the injection machine bottom heating barrel within the heated melt, Then in the injection machine screw or plunger drive, through the injection machine nozzle and mold gating system into the mold cavity, plastic cooling hardening molding, demoulding products. The structure is usually composed of forming parts, gating system, guiding parts, launching mechanism, thermostat system, exhaust system, supporting parts and so on. Manufacturing materials usually use plastic mold steel module, commonly used materials mainly carbon structural steel, carbon tool steel, alloy tool steel, high-speed steel. Injection molding process is usually only applicable to the production of hot plastic products, the plastic products produced by injection molding process are very extensive, from daily necessities to all kinds of complex machinery, electrical appliances, transportation parts and so on are molded by injection mold, which is the most widely used in the production of plastic products a processing method.
plastic mold including compression molding and pressure injection molding two types of structural mold. They are mainly used to form a kind of thermosetting plastic mold, the corresponding equipment is the pressure molding machine. Compression molding method According to plastic properties, the mold is heated to the molding temperature (generally in 103°-108°), and then the measurement of the pressure molding powder into the mold cavity and feeding room, closed mold, plastic in high heat, high-pressure action under the softening viscous flow, after a certain period of curing stereotypes, become the desired product shape. Pressure injection molding and compression molding is not a separate feeding room, molding before the closure of the mold, plastic in the feeding room to complete preheating is viscous flow state, under pressure to adjust squeeze into the mold cavity, hardening molding. Compression molds are also used to shape certain special thermoplastics such as difficult to melt thermoplastic (such as poly-vinyl fluoride) blanks (cold forming), optical properties of high resin lenses, slightly foaming nitrocellulose car steering wheel, etc. Plastic mold mainly by the cavity, feeding cavity, guiding mechanism, the introduction of components, heating system and so on. Pressure injection mold is widely used in the packaging of electrical components. The materials used in the molding die manufacture are basically the same as the injection moulds
Plastic extrusion die used to shape the production of continuous-shaped plastic products, such as a mold, also known as extrusion molding head, widely used in pipes, rods, monofilament, sheet, film, wire and cable cladding, profile and other processing. Its corresponding production equipment is plastic extruder, the principle of which is the solid plastic in the heating and extruder screw rotating pressure under the conditions of melting, plasticizing, through the specific shape of the mouth die and made the section and the shape of the same die of continuous plastic products. Its manufacturing materials are mainly carbon structural steel, alloy tools, and some extrusion molds in need of wear-resistant components will also be inlaid diamond wear-resistant materials. Extrusion process is usually only applicable to the production of thermoplastic products, the structure of the injection mold and plastic mold is significantly different. 3, Plastic blow molding mold is used to form plastic containers such as hollow products (such as beverage bottles, daily chemical supplies, such as a variety of packaging containers, a mold, blow molding form According to the principle of the main extrusion blow molding hollow molding, injection molding form According to the principle of the main extrusion blow molding hollow, injection blow molding hollow molding, Injection extending blow molding hollow Molding (commonly known as "injection pull Blow"), multi-layer blow molding hollow molding, sheet blow molding, such as hollow. Blow molding of hollow products corresponding to the equipment commonly referred to as plastic blow molding machine, blow molding only applicable to the production of hot plastic varieties of products.
Blow molding mold structure is simpler, the material used more carbon to manufacture. 4, plastic blister mold is a plastic sheet, sheet material as raw material forming some simpler plastic products, a mold, the principle is to use the vacuum blooming method or compressed air forming method to make the plastic plate and sheet fixed on the concave or convex die, and to deform under the condition of heating and softening to get the required forming products, Mainly used in a number of daily necessities, food, toys, packaging products production.
Blister die due to low pressure molding, so die material selection casting aluminum or non-metallic materials manufacturing, the structure is relatively simple. 5, high foaming polystyrene molding mold is the application of the expandable polystyrene (polystyrene and foaming agent beads) raw materials to form a variety of required shape foam plastic packaging materials a mold. The principle is that the polystyrene can be in the mold into the steam molding, including simple manual operation of the mold and hydraulic machine straight-through foam mold two types, mainly used to produce industrial products packaging. The materials for making such moulds are cast aluminum, stainless steel, bronze and so on. Structure and basic Parts 1, the composition of blow molding, casting mold and hot-formed mold structure is relatively simple.
The plastic die, injection mold and the structure of the transfer mold is more complex, forming parts of this type of mold are also more.
Basic parts have
① forming parts, including concave die, convex mold, all kinds of forming cores, are the parts of the inner, outer surface or upper, lower surface, side hole, side concave and thread of the molded products.
② supports the fixed parts, including the die seat plate, the fixing plate, the support plate, the cushion block, etc., for fixing the mold or the support pressure.
③ Guide parts, including guide pillars and guide bushes, are used to determine the relative position of the mold or the movement of the launching mechanism.
④ core-pulling parts, including oblique pins, sliders and so on, when the mold is opened to extract the active core, so that the product demoulding.
⑤ introduced parts, including putt, push pipe, push block, push piece board, push piece ring, push rod fixing plate, push plate, etc., to make the product demoulding. Many of the injection mold to promote the use of standard mold, the mold is made of the structure, form and size have been standardized and serialized basic components of the combination of the mold cavity can be processed according to the shape of the product.
Adopting standard mould frame is advantageous to shorten the mould cycle. 2, the role of the fixed mold seat plate (panel): its role is to fix the front mold on top. Runner Plate (Orifice plate): Its function is to remove the material in the runner when the mold is opened. Fixed-mode fixing PLATE: Its main function is to shape products with B board. Push board: Its main function is to remove the product from the mould when the mold is opened. Movable die fixing PLATE: Its main function is to form a product with a board. Pad: Its function is to strengthen the strength of a plate and fixed some parts on a board. Cushion Block: Die foot, Fangtie, etc. Its function is to let the roof have enough active space. Top PLATE: Its main function is to fix the thimble and push the thimble through the ejector rod of the injection machine when opening the mold. Movable die seat Plate: lower splint, bottom plate, etc. Its main function is to fasten the rear mould to the top. Guide Pillars and guide bushes: Their main function is to play a guiding role, so that the front and rear modules can be successfully completed all the action. Thimble: Its main function is to release the product when the mold is opened.
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