Plastic Injection Mold Manufacturer

Plastic Injection Mold Manufacturer

1, Core and cavity have three-dimensional surface.

Plastic products external and internal shapes are depend on core and cavity and it is very difficult to process this complex three-dimensional surface, especially the process of blind hole. If we use traditional process, it not only requires high technical level of work,but also need long period of processing .

2,High accuracy and surface quality requirement, long service time.

Presently, the plastic products size accuracy requirement is about IT6-7, surface roughness is Ra0.2-0.1μm, while injection mould fitting size accuracy requirement should be achieve to IT5-6 and surface roughness lower than Ra0.1μm. Plastic injection molds long-life for is essential improving efficiency and reducing costs

If you want to improve efficiency and reduce cost, I think you need a long life injection mould. Currently, the general useful time of injection mould is more than 100 million.Precision injection molds need a big stiffness mould frame, heavy template, and many support column or cone positioning device in order to prevent the deformation of the mold. The ejection equipment will affect the products’ deform and size accuracy, so we should choose the best ejection point, then guarantee the even demould.

For the structural design, most of high accuracy injection moulds choose mosaics structure; it will improve the processing accuracy and the interchange ability of mould part.

3, Long process, tight manufacture time.

A complete product always consists of injection product and part components supporting. Because of high requirement for products shape or size accuracy and because there are many characteristics of resin material, so after finishing the mould’s manufacture, we should test and modify the mould repeatedly, reducing developing and delivery time.

4, Remote design and off-site manufacture

Mould manufacture is not the finally destination, mould manufacture’s destination is appeal to customer’s requirement. Ordinarily, customer brings forward finally design, according to the customer’s requirement, mould manufacturer start to produce.

5, Specialize division, dynamic combination

Generally, mould production is always single, but there are many standard elements, such as mould frame and ejection pin. These can’t be finished in one manufacturing process.

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Solution for Plastic Mold heat treatment Issue

Solution for Plastic Mold heat treatment Issue

Plastic mold making failure mostly factors of heat treatment of this important aspect of. Because of the above heat treatment of general failure caused by improper accounting for about 50% of total failure mould. In order to give full play to the potential properties of mould steel, mould machining should be conducted after the quenching, tempering heat treatment in heat treatment, heating temperature, holding time, the length of the cooling speed of process parameter selection is not appropriate will be die failure factors. A machined good plastic mould,if lost due to improper heat treatment and its use value, is in the economy and the loss of time is very big, must adopt various measures to prevent mouth

Carbon and alloy elements with more influence of die steel of heating rate, poor thermal conductivity. So in the heat treatment (especially the quenching) heating speed not too fast, should be more slowly, to prevent mold deformation and cracking. Heating in air furnace quenching, in order to prevent oxidation and decarburization, using packing to protect heating, this heating speed is not fast, but the diathermy also slower, so won’t produce big thermal stress, relatively safe. In the use of salt bath furnace processing, mold heating speed fast, diathermy is also very fast, die inside and outside by thermal stress, if not properly controlled, it is easy to cause deformation or crack, resulting in failure of die, must be used to prevent or slow heating preheating acceleration

Plastic mold making will normally need heat treatment if you want the mold running over 1 million of life time shots

Die quenching effect of oxidation and decarburization is at very high temperatures, if not strictly controlled atmosphere, it is prone to oxidation and decarburization on the surface. But most die quenching, tempering after removal in local work surface grinding, the rest nearly no processing, therefore, oxidation and decarburization in heat treatment will also make the mold cause early failure. When the oxidation, mold surface easy to scratch, size, easy to produce fatigue crack in early use, when caused by decarburization, surface hardness significantly reduced resulting in early wear. plastic mold

In addition, decarburization mould surface after due to differences in inner and outer layer of tissue, cooling appear larger tissue stress often leads to quenching crack. In order to prevent oxidation and decarburization of mold can be used to protect the processing, packing box, filling materials filling anti oxidation and decarburization, sealed after heating. In addition, also can use salt bath furnace, controlled atmosphere furnace, vacuum furnace. Adopting the controlled atmosphere furnace must be strict control of carbon potential level of carbon potential is too low, will cause the same plastic mold surface decarburization, but carbon potential also cannot be too high, otherwise, although not happen decarburization, but often lead to make the surface of steel carburization embrittlement, which significantly reduce the fatigue strength of steel

Die casting manufacturer has the same issue during die casting mold making/

The quenching temperature effect of quenching temperature significantly influence the performance of various mold. The quenching temperature is too high, easy to grow up, and make a lot of carbide dissolution of the matrix, the formation of coarse needle martensite, make steel brittle, so die in use often cracking, chipping, breaking accident; on the contrary the quenching temperature is too low, the dissolution of carbide in the matrix is not full, the hardenability of steel worse, the quenching hardness is low, the use of no wear resistance, low life, at the same time, the compressive strength of steel is also low, prone to upsetting punch or drum and failure

Effect of the cooling conditions of quenching cooling condition. It is also very important. For different mould materials, should be organized according to state requirements, selection of different cooling rate. For high alloy steel, the alloy elements contain more, high hardenability, can the oil cooling, air cooling, even austempering and martempering processes such as, if adopts water cooling quenching is prone to rapid cooling quenching crack; for low alloy die steel, because of its lower hardenability, needs to use the water quenching cold can enhance the cooling speed, the general use of cooling water, if Liu Qi the oil cooling or air cooling, due to the low hardness after quenching, die do not wear, in service life shortened, also can cause early failure.

Plastic mold steel heat treatment have issue will effect Injection molding cost. Because the poor quality mold will effect the mold life and injection molding parts cost

Mould for manufacturing T10 carbon tool steel for cold impact annealing time, in actual use in the mold face many cracks and scrap. The observations show that the microstructure, two carbide in ferrite matrix on the distribution uneven, and there is a lot of graphite precipitated at the grain boundary. The analysis thinks, this kind of graphite by annealing thes teel in the temperature range of 780-800 DEG C when the insulation, long time caused by the.