| Types of mould |
 |
 |
|
There are no translations available. 1.Punching bending mould (also known as hardware mould): it can be used in the manufacturing of front and back covers of cars, various handrails in subway and computer cases. With rapid ram punch force can be achieved the effect of punching, shearing, bending, flanging, and stretch forming.2. Injection mould: Mouse and mobile phone shells we use are all made by injection mould. We can make sense in this way. The Chinese character “注-means Injection” which consists of “水-means water” and “主-means main machine” (injection machine or former) heats the plastic into liquid and then injects it into the mould with high pressure. As the mould is cooled down by water an injection mould product is completed and ready for use. 3. Casting mould (also known as foundry mould): the taps, three phase machine shells, base and frame or large machines are all manufactured by casting mould. Casting is usually applied in the metal processing, such as 45 # steel, brass, aluminum alloy and zinc alloy. Casting mould is made of aluminum alloy in product form. With casting mould impressed in sand, the product is finished by casting liquid metal into the mould. Products made out of this way have shortness of rough surface which leads to size error of more than 5mm. China since ancient time has had high casting technique level. The famous Si Mu Wu Ding is made by this way of casting. The western countries in order to improve the precision of the casting have developed a casting method without the use of sand which is called precision casting mould or lost-wax mould. It works in this way. Fill the mould with wax first. As the wax is cool down the wax is of the same size with the product. Mix the glue with sand and cover it on the surface of wax. Put the mould into the heating box. The wax will melt quickly and leave it to be complete sand mold. With the same method, cast liquid metal mold into the mould and the product is finished before it is rolled in the drum for sand surface. Product made out of this way has fine surface with size accuracy up to 0.2mm. 4. Pressure casting mould: the structure and mode of production is similar to injection mould with the only difference of metal material. For example, shells of IBM computer and other high-end notebook are the casting of magnesium alloy, as well as the steel shell of Nokia mobile phone; 5. Blowing mould: Blowing air into the heating plastic pieces to make it embed and adhere to the inner surface of the mould. The most common mineral water bottles are made in this way. As to some special molds, for they are rarely used it won’t mention here.
|