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Archive for the ‘Vacuum Molding’ Category

Mold is a major technical equipment of modern industry, the production of many industrial products, an indispensable component. China’s accession to WTO, ability to attract foreign investment increased year by year, the status of the world become more prominent product manufacturing plants, various industrial products import more and more mold.

    The type of mold is usually processed in accordance with the different objects and processes are classified, from the industry point of view the main distinction between a plastic mold, rubber mold, the metal of the cold die, Metal extrusion die of cold and hot extrusion dies, metal drawing die , powder metallurgy molds, metal casting molds, metal casting molds, glass molds, fiberglass mold and so on.

    The following only in respect of imports of the most common plastic molding process used in the different types of mold are classified and how to make a description.

    The most common method of plastic forming the melt into the general shape and solid forming two main categories: the melt molding is the plastic heating to above the melting point, so that at the molten state for molding the way, is such a molding method of molding process mainly injection molding, compression molding (reduced) molding, extrusion, etc.; solid phase forming is less plastic in the melting temperature to maintain a class under solid molding method, such as the production of some plastic containers vacuum molding, compressed air forming and blow molding. There are also liquid molding methods, such as casting plastic molding, slush and dip dip molding method.

    The molding method according to the different, different processes can be divided into the corresponding requirements of plastic processing mold types, mainly injection mold, extrusion mold, pressure mold plastic, blow mold, plastic mold, high foam polystyrene Ethylene forming molds.

    Injection (plastic) molds

    It is mainly the production of thermoplastic items most widely used as a mold, plastic injection mold corresponding to the processing equipment is plastic injection molding machine, plastic injection machine at the end of the first heating the barrel to heat melting, then the injection machine screw or a plunger, driven by the injection machine nozzle and mold pouring into the mold cavity systems, cooling hardening plastic molding, mold release by products. Usually forming part of its structure, gating system, oriented components, introduced institutions, thermostat systems, exhaust systems, components and other supporting components. Manufacturing materials, usually plastic mold steel module, the material used mainly for carbon steel, carbon tool steel, alloy tool steel, high speed steel. Injection molding processing methods usually apply only to the production of thermoplastic varieties of products, manufactured using injection molding process a wide range of plastic products, from daily life to all kinds of complex mechanical, electrical, transport and other parts are injection molding, and Production of plastic products it is the most widely used as a processing method.

    Plastic compression molds

    Including compression molding and injection compression molding die two structure types. They are mainly used to shape a class of thermosetting plastic mold, its corresponding equipment is pressure molding machine. Compression molding method is based plastic features, will mold heated to molding temperature (usually in the 103 -180 ), and then measure a good plastic powder into the mold cavity pressure and the feeding room, closed mold, plastic at high temperature, high pressure tends to soften the viscous flow, after a certain time after the curing stereotypes, as the shape of the required products. Pressure injection molding and compression molding is different with a separate feeding room, before forming the first closed mold, plastic, finished in warm indoor feeding was viscous flow state, under pressure and speed to squeeze into the mold cavity, curing molding. Compression mold is also used to shape some of the special hard to melt thermoplastics such as thermoplastic (such as PTFE) rough (cold forming), the optical properties of high resin lens, slightly foaming nitrocellulose car steering wheels . Compression molds mainly by the cavity, feeding cavity, oriented institutions, introduction of components, heating systems and other components. Pressure injection molds are widely used in packaging electrical components area. Manufacture of compression molds and injection molds used in the same material.

    Plastic Extrusion Tooling

    Is used to produce a continuous shape forming a kind of plastic products mold, also known as extrusion head, is widely used in pipes, rods, filaments, sheets, film, wire and cable coating, profiles and other processing. Their corresponding production equipment is plastic extrusion machine, the principle is solid plastic in the heating and rotating screw extruder melt under high pressure, plastics, die by a specific shape made of the same shape of cross sections and die continuous plastic products. The main material of carbon steel, alloy tool steel, and some out of the mold parts will need to wear a wear-resistant materials such as diamond inlay. Extrusion processing technology normally only used in the production thermoplastic varieties of products, its structure and injection molds and pressure modeling has obvious difference.

    Plastic Blow Mold

    Is used to molding hollow plastic container class products (such as beverage bottles, cosmetic packaging supplies and other containers) of a mold, blow molding process principle in the form mainly by extrusion blow molding, injection blow molding hollow , injection blow molding extension (commonly known as “injection stretch blow”), multi-layer blow molding, sheet molding, blow molding hollow. Hollow blow molding products corresponding to the device commonly known as plastic blow molding machine, blow molding is only applicable to the production of thermoplastic varieties of products. Blow mold structure is more simple, more than the materials used to manufacture carbon steel.

    Plastic Forming Mold

    Is a plastic plate, sheet material as raw material, some of the more simple plastic molding a mold, the principle is the use of vacuum or compressed air forming method of forming methods to fix the die or punch on the plastic plates, sheets, in case of heating to soften the deformation of the mold cavity attached to get the required shape products, mainly for some daily necessities, food, toys packaging products production. Plastic mold for low pressure molding, the die cast aluminum or non-metallic materials and more materials used, the structure is relatively simple.

    High foam polystyrene mold

    Is the application of expandable polystyrene (made of polystyrene and foam particles composed of bead-like) all the necessary raw materials for forming the shape of a mold foam packaging materials. The principle is that polystyrene can be made by blowing steam into the mold shape, including simple manual hydraulic press mold and mold are two types of straight-foam is mainly used to produce industrial products packaging products. Manufacture of such materials are cast aluminum molds, stainless steel, bronze, etc..

Find More Vacuum Molding Articles

A sand casting or a sand molded casting is a cast part produced by forming a mold from a sand mixture and pouring molten liquid metal into the cavity in the mold. The mold is then cooled until the metal has solidified. In the last stage the casting is separated from the mold. It sounds that the producing of a sand casting is simple and easy operated. However, it does not. We must have realized that the mold is significant in the producing process. There are many alternative molds are applied in producing process. Among the various variations of the sand casting process is vacuum molding.

Molding is a process used in manufacturing to shape materials. Vacuum molding is a kind of sand casting process generally expected for most ferrous and non-ferrous metals, in which unbonded sand is held in the flask with a vacuum. The flask is a special vacuum forming flask which is placed over the plastic pattern. And the sand it put to fill the flask.

Why does vacuum molding be popular? The followings maybe give you some answers. Vacuum molding equals to V-process, whose plastic film has a certain degree of lubricity. Thus, it is able to expand slightly when the vacuum is drawn in the flask. Furthermore, no moisture related defects, no cost for binders, excellent sand permeability, and no toxic fumes from burning the binders lead it to be popular and outstanding among various variations. What else, the detachment of the sand enables the pattern not to wear out. However, apart from the above advantages, there is major disadvantage that people should endeavor to overcome. It is that the process is slower than traditional sand casting. Thus, it is only suitable for low to medium production volumes; approximately 10 to 15,000 pieces a year.

With the quick development of the molding industry, we are benefit from it. The working efficiency and producing specifications are extensively improved and regulated. It is wise to make full use of the advantages and be creative to come up with some ideas to improve the weakness It is reported that the molding tool market total amount of world has been keep in recent years at 60,000,000,000~ of USD 65,000,000,000. In other words, it shows a bright future for molding industry.

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