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New development technology of MIM metal injection molding (3)

Categories: ZCMIM NewsStars: 3StarsVisit: -Release time: 2019-04-02 10:58:00
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1. Hot runner technology

The hot runner injection mold is a true no-flow condensate injection mold, and hot runner technology is an advanced technology in MIM metal injection molding process.

Through precise design, manufacturing and control technology, material always kept in a molten state in entire tunnel, no condensate produced, no drooling and material is not overheated to separate or degrade.

Hot runner structure is mainly composed of a main runnel nozzle, a plate, a nozzle, heating and temperature measuring elements, and mounting and fastening parts.

Due to high technical difficulty, entire hot runner system is currently designed and manufactured by a professional company. A complete set of complex hot runner molds has been designed and manufactured by experienced injection mold companies together with hot runner equipment companies to ensure smooth injection molding.

The hot runner system has a complicated mold structure and high cost, and is suitable for continuous production in large quantities:

-The hot runner system has no flow channel flocculation de-molding process, and entire injection process is easier to achieve automatic control;

-There is no flow channel recycled material used incorporation, stability of production process is improved, and consistency of quality of mass production products is improved;

- The pressure loss of flow channel is reduced, injection pressure can be reduced, tendency of separation and degradation of injection material is lowered, residual stress of product is reduced, and deformation is reduced;

- The holding time is longer and more effective, shrinkage rate of the injection part is reduced, and the density of each part of the part is more uniform;

- It is possible to manufacture articles with larger dimensions, thinner walls, more complex shapes and higher precision;

-Combined with latent gates that can’t be used in conventional MIM molds, reducing processing of green part gate, which can improve production efficiency;

- Saving energy, mass production can reduce costs.


2. Rapid mold technology

Manufacturing cost of a normal production mold is usually very high. In many cases, it is necessary to make an experimental mold to find out problems that may be encountered in entire process to verify design and production. To accommodate this situation, many rapid or soft mold techniques have emerged to make experimental molds that meet trial production of hundreds of parts.

At present, aluminum alloy, particle reinforced epoxy resin, beryllium copper, low carbon steel, stainless steel and cobalt alloy have been used as soft metal injection mold. Occasionally, zinc, aluminum and niobium alloys are used to make test molds or prototypes due to ease molding.

However, due to easy scratching and damage, final production mold will use hard materials.

It is a relatively new technology to make MIM plastic mould with limited service life by using the principle of silicone rubber mould. The molten plastic is poured around the cavity of the master mold, after solidification and hardening, taking out plastic part from mold cavity. Pressed into a restricted formwork, such a plastic mold can be used to withstand hundreds of low pressure injection.

Laser rapid Prototyping is a very simple tooling or prototyping method that uses laser scanning to integrate stacked plastic or metal powder to make product directly. Another mold manufacturing process for laser rapid prototyping is using stacked resin or paper model to produce part by precision casting or electroforming.

Mold produced by these methods are rough and have low precision, which cannot meet demanding requirements of production molds.


3.  Core forming technology

For parts with particularly complex cores or special structures that are difficult to de-mold by conventional methods, the use of core forming technology can solve molding problems of such parts.

Basic idea of core forming technology is to make mold core structure as an insert with material resin, paper, low melting point metal, etc.. After molding and de-moulding, do not take out the insert immediately and keep it inside the mold cavity. Before sintering, removing insert from green part by melting, cracking or solvent dissolution methods.


With this method, it is easy to carry out mass production of parts which are difficult or impossible to manufacture directly by conventional metal injection molding such as a peripheral inner concave, a fine small thread or the like.


Keywords in the article: MIM metal injection molding
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