Check if there are any problems with the following four reasons for cracking or fracture. A. Placement of the workpiece. If there is any problem, please place it correctly. B. Similarly, POM splits too fast. The solution is the same as above. C. Vibration. If there is a vibration, the source of the vibration should be found and solved. D. The density and weight of the workpiece are not up to the standard and the injection process needs to be changed.

There are four reasons. A.POM splits too fast, usually by lowering temperature, reducing acid intake and increasing degreasing time. B. There are too many paraffin ingredients in the feed, so we need to replace the raw materials. C. Mould. Mould structure needs to be modified. D. Injection temperature is too high and should be lowered.

This process is similar to plastic injection moulding, but the injection temperature is slightly higher, but still lower than 200 degrees C. Then semi-finished products are put into a high temperature furnace with temperature exceeding 1000 degrees C, which can burn off plastic adhesives while steel remains.

With the increasing requirement of injection moulding accuracy, besides the correct selection of materials and modification, it is very important to choose the right conditions and analyze the relationship between shrinkage rate and production, especially shrinkage rate, which seriously affects the quality of products. There are many factors that affect the quality of products.

Powder injection moulding (PIM) has been used more and more widely, especially in mobile phones. Because the market needs lighter, thinner and more aesthetic mobile phones, and needs to adopt good technology to reduce the size of mobile phones, a mobile phone company is seeking to use metal injection moulding method to manufacture mobile phone assembly parts.

1.Electrolytic deburring
2.Chemical deburring
3.Burr removal by rolling
4. Deburring at High Temperature

The properties of metal injection moulding comprehensively reflect the properties of the metal itself, as well as the properties of individual particles and particles. Generally speaking, the properties of metal powders can be divided into chemical properties, physical properties and technological properties. Chemical properties refer to metal content and impurity content.

MIM is usually used to produce high-complexity, high-precision, high-strength and exquisite-looking parts, especially for small parts with complex shape and cannot be processed by CNC machining. However, for larger parts, the raw materials cost is high and the demand of binders is quite large. Meanwhile, it is easy to lead to product size deviation after sintering, which cannot effectively guarantee the accuracy requirements. In the future, with the continuous progress of industry technology, the size and scale of MIM products will gradually break through.

Why do medical minimally invasive surgical instruments need MIM? Because they must meet the following requirements

Powder metallurgy pressing is a kind of machine pressure extrusion moulding, in which powder is filled by gravity. In the actual industrial application, it is one of the most widely used. Cold closed steel die pressing, cold isostatic pressing, hot isostatic pressing and warm pressing all belong to pressing forming. However, some complex structural parts cannot be produced, or can only be made into embryo material because of the up-down-two-way pressing. Many parts can be made both by injection moulding and powder metallurgy pressing, but the final performance and price of the parts will be different. So what kind of processing technology to choose, please come to NO.2 Machinery to consult.

Metal injection moulding (MIM) was first developed in California in 1973. MIM is a new type of powder metallurgy moulding technology, which combines plastic injection moulding technology with powder metallurgy. Powder metallurgy injection moulding technology is similar to powder metallurgy technology. Firstly, solid powder and organic binder are evenly mixed together, plasticized by heating at 150 degrees, injected into the mould cavity by injection moulding equipment, then solidified. Then, the binder in the forming blank is removed by thermal decomposition. Finally, like powder metallurgy, precise parts are produced by sintering.

To immerse the sintered metal products in oil, the parts surface must be cleaned up first. There are generally three ways for oil immersion in metal injection moulding products:vacuum oil immersion, soaking oil method and ordinary oil immersion.

Metal injection moulding is just another process of powder metallurgy. Many theories and methods of powder metallurgy can be applied to metal injection moulding products. Oil immersion cannot only increase the corrosion resistance and wear resistance, but also make some porous bearing materials have the characteristics of automatic oil supply, so as to reduce the number of lubrication and maintenance in ordinary work, and prolong their service life.

The size of scattering angle is related to the size of particles. The larger the particle is, the smaller the angle of scattering light is, while the smaller the particle is, the larger the angle of scattering light is. The intensity of scattered light represents the particles quantity. So the particle size distribution can be obtained by measuring the intensity of scattered light at different angles.

Nozzle temperature. Nozzle temperature is usually slightly lower than the maximum temperature of the barrel, which is to prevent the "salivation phenomenon” that may occur in the through nozzle. The temperature of the nozzle should not be too low, otherwise the nozzle will be blocked because of the melt early solidification. It will also influence the product performance.

MIM cycle -- Injection Time: Injection time refers to the time from the beginning of injection to the time when the plastic melt fills the mould cavity (plunger or screw advance time). In production, the injection time of small plastic parts is generally 3 to 5 seconds, and that of large plastic parts can reach tens of seconds. The filling time is inversely proportional to the filling speed, shorter injection time, higher filling speed. Lower orientation and higher shear rate. The apparent viscosity of most plastics decreases, especially those sensitive to shear rate.

he effect of product wall thickness on deformation usually varies with the type of plastics. For amorphous plastics, too thin walls tend to be bad orientation. Therefore, in order to reduce the deformation, the wall thickness is usually increased appropriately in the design. The purpose is to reduce the adverse effects of molecular orientation. At the same time, increasing the wall thickness also increases the products rigidity, thus reducing the deformation of the products.

The metal molds of MIM technology have the same using life as plastic injection molds. Because the mold is made of metal, MIM is suitable for mass parts production. Because of metal injection machines consistency and repeatability, this technology makes sure high quality of mass production.

In order to meet the needs of the industry for the continuous developmen, it is necessary to explore the space for the growth of efficiency of MIM technology and equipment. At present, the restrictions on mechanical and chemical properties and optical appearance of parts are mainly caused by the following aspects: uneven shrinkage, uneven mixing of powders and raw materials, density fluctuation caused during degreasing, uneven temperature in sintering furnace and gas management of chemical decomposition.