MIM process equipment

equipment is an important technology of MIM into the industrialization of survival foundation and material along with the constant development of MIM industry, plastic injection molding industry, powder metallurgy and other industry equipments are constantly being modified to use, at the same time a large number of unique professional equipment suitable for MIM technology are constantly emerging, the correct choice and in the process of mastering the MIM production all sorts of equipment, to improve the yield and quality of products, raise Labour productivity, save manpower and energy, reduce costs, improve working conditions and eventually promote the development of the industrialization of the MIM is of great significance.

Original article link：http://www.zcmim.com/article/mim-process-equipment_1.html

main cause of deformation of carbide sintered MIM

MIM of cemented carbide sintering deformation include: the main reasons for forming billet density is uneven, imbalance of carbon concentration, uneven temperature sintering process.On this basis can make control MIM model of cemented carbide vacuum sintering deformation 筪 via optimization of MIM process of the preparation of tungsten carbide products minimal size deviation plus or minus 0.02 mm.

Original article link：http://www.zcmim.com/article/main-cause-of-deformation_1.html

MIM carbide skimmed billet

MIM carbide skim billet usually has about 60% of the relative density, relative density of the final product will reach 100%, compared with the traditional moulding and sintering, the MIM sintering process with greater contraction.Therefore, MIM skim sintering on the densification of the billets, dimensional accuracy and conformal, internal organization structure of the control more difficult.Factors that affect the MIM sintering include powder particle size, shape size and shape, temperature, time, atmosphere, powder loading capacity, etc.

Original article link：http://www.zcmim.com/article/mim-carbide-skimmed-billet_1.html

the MIM iron base alloy

MIM iron base alloy is refers to the use of the preparation of metal injection molding for iron base (iron content is in commonly 90% - 98%), add a certain amount of copper (Cu), nickel (Ni), molybdenum (mo), chromium (Cr), manganese (Mn) and control of the elements such as carbon (C) content and composition of the alloy system products.The MIM iron base alloy is a kind of structural material with excellent properties of sintering state has good elongation (5% 25%).Carbon content is higher than 0.3% (mass fraction) of iron base alloy after heat treatment can achieve high strength (mpa), 1200-1500, relative density can reach above 97%.The most widely used with Fe - alloy system.

Original article link：http://www.zcmim.com/article/the-mim-iron-base-alloy_1.html

MIM green

MIM green fracture strength of 3-20 mpa, green strength can be adjusted by powder and binder, usually, it is different size and shape of powder mixed together to increase the friction between the particles, deformation usually occur in the early heating, because thermoplastic binder softening and the intensity of lose, most prone to deformation in about 150 c heat preservation.

Original article link: http://www.zcmim.com/article/mim-green_1.html

MIM parts is the problem

Is a common problem in MIM parts is the final size of the inconsistent with nominal size, we can through the change of solid powder in the feed volume ratios of modification, if need to increase size ware, the solid powder in the feed quantity should be increased, when the sintering shrinkage is relatively small, but it must be under the condition of solid powder loading xiaoding threshold, and only a tiny change, if improper size is caused by the initial forming scheme, so this method doesn't work.

Original article link :http://www.zcmim.com/article/mim-pitp_1.html

MIM Feedstock Binder

MIM feedstock is a kind of suspended system of powder and binder. Its binder is commonly multicomponent, mainly composed of a low melting point and low molecular weight group, and a high melting point and high molecular weight polymer as well as a small amount of surface material. Polymer skeleton decides liquid viscosity. Polymer solution is usually fake plastic body, its viscosity value decreases with shear rate increasing in a certain temperature.

Original article link：http://www.zcmim.com/article/mim-feedstock-binder-sdvnk_1.html

MIM Feedstock

MIM feed represents a balance relationship between powder and binder. The appropriate proportion between them decided the success of a series of process in injection molding. The design of feedstock should consider moulding difficulty and final size requirements. Low molecular weight of binder can reduce viscosity, easy to forming. Too much binder although can reduce feedstock viscosity, it can't make a good contact between particles, lead to serious deformation in de-binding and even collapse. If binder is so little, high viscosity makes it easy to occur gaps, bringing difficulty injection. After de-binding, those gaps will result in crack at the same time.

Original article link：http://www.zcmim.com/article/mim-feedstock_1.html

the MIM metal injection molding of cemented carbide powder

In metal injection molding MIM, another important powder is cemented carbide powder, it is a mixture of tungsten carbide and cobalt powder powder, cobalt powder and tungsten carbide inspection milling time can reduce the average particle size of powder particles, and on the surface of tungsten carbide wrapped a layer of cobalt in the process of sintering, cobalt powder melt into liquid phase, when cooling solidification as a kind of hard phase, after grinding powder its standard oxygen content of 0.07%, all other refractory metal chromium, molybdenum content of about 0.01% in general.

http://www.zcmim.com/article/mim-metal-injection-molding-tmimocc_1.html

the MIM ideal characteristics of metal injection molding

Suitable for injection powder particle size and morphology change is bigger, in the morning, but in general, the requirement for particles of equiaxed grain size, nearly spherical, and less than 20 microns, due to the large particles between small particles can fill powder, thus wide particle size distribution of powder packing density is high, but to ease the breakfast injection of broad size distribution of two phase separation, so as to bring the technology behind the greater difficulty.

Original article link：http://www.zcmim.com/article/metal-injection-molding-tmicomi_1.html

mechanical performance requirements of MIM products

At present although the MIM has been applied in all kinds of material system, but in the context of market sales, the vast majority of products focused on his brother to mechanical performance requirements is not high alloy steel, stainless steel products, with Japan's statistics as an example, in 2002, 67% of MIM products for low alloy steel and stainless steel products, less than 15% T alloy, high speed steel, cemented carbide of high mechanical performance requirements such as sensitive tool materials.

Original article link：http://www.zcmim.com/article/mim-mprom_1.html

MIM sintering problem

At present although the MIM has been applied in all kinds of material system, but in the context of market sales, the vast majority of products focused on his brother to mechanical performance requirements is not high alloy steel, stainless steel products, with Japan's statistics as an example, in 2002, 67% of MIM products for low alloy steel and stainless steel products, less than 15% T alloy, high speed steel, cemented carbide of high mechanical performance requirements such as sensitive tool materials.

Original article link：http://www.zcmim.com/article/mim-mprom_1.html

What Special Parts Unable to be Made by Traditional Powder Metallurgy?

As a kind of manufacturing high quality precision parts near net shape forming technology,  metal injection molding has the incomparable advantage over conventional powder metallurgy and machining. MIM can make a lot of parts with complex shape characteristics, such as various external cutting, external thread, conical outer surface, cross hole and blind holes, concave and convex, key pin, reinforcing rib plate, knurled surface and so on. All parts has the characteristics above are unable to use traditional powder metallurgy method.

Original article link：http://www.zcmim.com/article/metal-injection-molding-wsputbm_1.html

What Kinds of Materials can be Used for Aviation Industry?

One kind materials for powder metallurgy is a special functional material, such as friction materials, antifriction materials, sealing materials, filtration materials and so on. It also has close relation with MIM process(http://www.zcmim.com/helps/mimprocess.html), which is mainly used for aircraft and engine auxiliary machinery, instrument and airborne equipment. Another kind of powder metallurgy material is high temperature and high strength structural materials, mainly used for important component for aircraft engine.

Original article link：http://www.zcmim.com/article/powder-metallurgy-wkomc_1.html

American MIM Process

American BCC Research company had made twice investigations in 2005 and 2008 on injection molding Market. In year 2004, MIM global market report was $382 million. It was expected to $571 million by the end of 2009. However, in 2009, MIM sales reached $985 million. It was  expected to reach $1,900 million by the end of 2014.

Original article link：http://www.zcmim.com/article/american-mim-process-amiab_1.html

Metal Injection Molding Used in What Industry?

As ZCMIM mentioned before, MIM is also widely used in medical, 3C and hardware machinery, tool accessories, fishing accessories, mobile phone accessories, electronic accessories, mobile phone USB interface OEM except for industry. One Characteristic of metal injection molding is suitable for mass production small metal parts with complicated shape, high precision and high performance. Usually MIM has more cost advantage for annual demand over 100 thousand.

Original article link：http://www.zcmim.com/article/metal-injection-molding-uwi_1.html

MIM Application Introduction

Metalinjection molding (also known as MIM or powder injection molding or PIM) is a net forming process for manufacturing solid metal parts. It combines the material properties of forging and the design flexibility of injection molding. Due to its inherent design flexibility, MIM can be used to create any shape product with a variety of alloys. Today, many high performance required products are used MIM process, including automotive fuel injection and ignition system, aerospace and defense systems, mobile phones, dental instruments and dental tools, electronic radiator and reinforcement sealing packaging, junction box, industrial tools, optical fiber connector, fluid spray system, hard disk, pharmaceutical equipment, handheld electric tools, pumps, surgical instruments and sports equipment etc..

Original article link：http://www.zcmim.com/article/metal-injection-molding-maid_1.html

Application Characteristics of MIM Technology

Using MIM technology to develop metal parts’ geometry, we should pay attention to the flexible design of plastic parts, getting rid of the limitation of traditional metal processing technology. MIM process can deal with complex shape parts, assess multiple parts, integrate a variety of feature / function into  a single component, enhance product assembly performance, simplified mechanical components and reduce the quality, but also can customize various physical properties according to the expected end use.

MIM is the most cost-effective process for manufacturing medium or large quantity small and complex metal parts. One way to evaluate an alternative is to envision how much machining operations are used to produce a product. Generally speaking, regarding a product required 4 or more process, MIM is the preferred process. Note: for each machining feature, processing cost will increase; while for mold shaping, MIM cost increase little, and even do not increase the cost.

Original article link：http://www.zcmim.com/article/mim-technology-acomt_1.html

Surface Treatment for Metal Injection Molding Robotic Components

The very common surface process for MIM (metal injection molding)

 rc helicopter drone parts is magnetic grinding. It is processed by magnetic grinding machine and needle, mixing brightening agent and water. Put products on grinding machine plate for grinding 20-40 minutes. The grinding time is subject to the requirements of brightness.

Another common surface finish for MIM robotic parts are sandblasting. It is processed by sandblasting machine.

There are two kinds sandblasting machines: automatic and manual. Adhering required sands to product surface by Pneumatic nozzle. The pressure is usually 3 kg, keeping for 10 minutes .At same time it can chose fine or rough sands according to different requirements.

Void in MIM Smartphone Lens Ring

MIM process manufacture notes that void is a common defect in MIM process. Looking at the reason for void based on our last experience of UAV remote control metal button project.

There are two reasons for inner space within finish products:

1. Occurred in thick part, resulting from contraction after central cooling
2. Caused by volatile decomposition of plastic, air or water

The causes and treatment:
-  injection pressure is too low, holding time is too short.

- the back pressure is too low
- material temperature is too high, sticking for too long time
- improper design of product thickness
- mould flow channel or injection gate is too small

 --don’t dry material enough

- spray too much mold release agent