Research Status and Developing of Metal Injection Molding

2012 ◽  
Vol 629 ◽  
pp. 100-104 ◽  
Author(s):  
Yi Qiang He ◽  
Bin Qiao ◽  
Jian Ming Yang ◽  
Li Chao Feng
Keyword(s):  
Injection Molding ◽  
Technical Characteristic ◽  
Metal Injection Molding ◽  
Full Potential ◽  
Matrix Composites ◽  
High Efficient ◽  
The Status ◽  
Near Net Shape ◽  
Viable Method ◽  
Mim Technology

Metal injection molding(MIM) is a high efficient and near net shape manufacturing technology, which is appropriate for parts of small size and complex shape. MIM provides a viable method to fabricate metal and metal matrix composites with discontinuous reinforcements, and micro metal injection molding (μMIM) is applied to manufacturing products at micro scale. The status of the research and development of MIM and μMIM are reviewed. Processes including mixing, injection molding and subsequent debinding and sintering are summarized. And technical characteristic, injection processing and application of μMIM are introduced. The disadvantages in mixing, injection molding and debinding processes limit MIM to fabricating components with small size, low precision and mechanical properties, and it is necessary to prevent the powder from reuniting and avoid any oxidation and impurity during μMIM process. Further investigations in these areas will give rise to being explored of full potential of MIM technology.

Rheological Behavior of Carbon Nanotubes / Copper Feedstocks for Metal Injection Molding

2011 ◽  
Vol 403-408 ◽  
pp. 5335-5340 ◽  
Author(s):  
Faiz Ahmad ◽  
Ali Samer Muhsan ◽  
M. Rafi Raza
Keyword(s):  
Carbon Nanotubes ◽  
Injection Molding ◽  
Flow Behavior ◽  
Metal Injection Molding ◽  
Increasing Trend ◽  
Multi Walled Carbon Nanotubes ◽  
Blade Mixer ◽  
Near Net Shape ◽  
Copper Composite ◽  
Walled Carbon Nanotubes

Metal injection molding (MIM) technology is known for its ability of producing near net shape components. This study presents the results of flow behavior of multi-walled carbon nanotubes (MWCNTs) reinforced copper composites mixes. The solid loadings in the copper mixes were investigated in the ranges of 55-61 V% using a binder. Copper mixes and copper/MWCNTs were compounded using a Z-blade mixer for homogenous dispersion of solids in the binder. Results identified a mix containing 59 V% copper suitable for substitution of MWCNTs. The flow properties were measured using a capillary rheometer in the shear rate range expected to occur during metal injection molding. An increasing trend in viscosity of the copper mixes with powder loading was noted. Copper/MWCNTs composite mixes showed viscosity more than 1000 Pa.s perhaps due to addition of MWCNTs and increasing trend in viscosity of copper/MWECNTs was recorded. The results of flow data showed that all copper composite mix containing up to 10 Vol.% MWCNTs were successfully injection molding and test samples were produced.

Investigations on Metal Injection Molding of 316L SS Using Thermoplastic Natural Rubber (TPNR) Binder as a New System

2012 ◽  
Vol 576 ◽  
pp. 150-153 ◽  
Author(s):  
Hassan Norita ◽  
Noor Azlina Hassan ◽  
Sahrim H. Ahmad ◽  
N. Muhamad ◽  
Mohd Afian Omar ◽  
...  
Keyword(s):  
Solvent Extraction ◽  
Injection Molding ◽  
Natural Rubber ◽  
Extraction Process ◽  
Metal Injection Molding ◽  
Binder System ◽  
Outward Appearance ◽  
Injection Parameter ◽  
Near Net Shape ◽  
Thermoplastic Natural Rubber

Metal injection molding (MIM) is a near net-shape manufacturing technology that is capable of mass production of complex parts cost-effectively. The unique features of the process make it an attractive route for the fabrication of the new binder system since the success of MIM process is dependent on the outward appearance of the resultant feedstock. Thermoplastic natural rubbers (TPNR) blends consist of thermoplastics, such as polyethylene (PE), alloyed with natural rubber (NR) with different thermoplastic to NR ratios. The soft grade TPNR is produced by blends with compositions richer in rubber while the harder grades can contain up to about 30 % NR. This study investigates the influence of new binder system consisting of TPNR on injection parameter, density of injected molded specimen and changes during solvent extraction. Results show that TPNR plays an important role as a good binder system and shortens the solvent extraction process.

scholarly journals Development and Application of Rapid Injection Molds Using Aluminum-Filled Epoxy Resins for Metal Injection Molding

2021 ◽  
Author(s):  
Chil-Chyuan Kuo ◽  
Xin-Yu Pan ◽  
Cheng-Xuan Tasi
Keyword(s):  
Injection Molding ◽  
Epoxy Resins ◽  
Metal Injection Molding ◽  
Manufacturing Cost ◽  
Injection Mold ◽  
Rapid Injection ◽  
Near Net Shape ◽  
Tooling Technology ◽  
Manufacturing Time ◽  
Conventional Machining

Abstract Metal injection molding (MIM) is a near net-shape manufacturing process combing conventional plastic injection molding and powder metallurgy. Two kinds of injections molds for MIM were developed using conventional mold steel and aluminum (Al)-filled epoxy resins in this study. The characteristics of the mold made by rapid tooling technology (RTT) were evaluated and compared to that fabricated conventional machining method through MIM process. It was found that the service life of the injection mold fabricated by Al-filled epoxy resins is about 1300 molding cycles. The saving in manufacturing cost of an injection mold made by Al-filled epoxy resins is about 30.4% compared to that fabricated conventional mold steel. The saving in manufacturing time of an injection mold made by RT technology is about 30.3% compared to that fabricated conventional machining method.

Titanium Metal Injection Molding, a Qualified Manufacturing Process

2016 ◽  
Vol 704 ◽  
pp. 122-129 ◽  
Author(s):  
Jobe C. Piemme ◽  
Joseph A. Grohowski
Keyword(s):  
Injection Molding ◽  
Medical Industry ◽  
Sampling Plan ◽  
Metal Injection Molding ◽  
Statistical Sampling ◽  
Production Environment ◽  
Process Validation ◽  
Grade 5 ◽  
Insight Into ◽  
Mim Technology

Metal injection molding (MIM) of titanium for implantable applications has been referred to as “the holy grail” of MIM. The challenges of forming a highly reactive, finely divided metal powder are well understood within the industry [1]. Titanium has the dual challenge of being both highly reactive and very sensitive to contamination. Over the years there has been tremendous activity in academia and industry regarding overcoming the challenges of titanium MIM [2]. The most relevant of those challenges is meeting the chemical and mechanical requirements of the Grade 5 (Ti-6Al-4V) alloy in a production environment. Praxis has qualified its titanium MIM process to meet the strict requirements of the medical industry. During this validation, the consistency of the process and product was evaluated at numerous points. This discussion focuses on input controls and testing the outputs of the process from both the perspective of interstitial content and mechanical properties. These characteristics cannot be non-destructively inspected and must be monitored by a statistical sampling plan to ensure quality during production. In order to develop a sampling plan that meets the quality requirements of the customer, it is necessary to determine the capabilities of the process. This article provides insight into the process validation of Praxis’ titanium MIM technology.

scholarly journals Comparative Study of Adhesion of Brackets with Metal Injection Molding (MIM) Technology and Welded bases: In vitro Study

2020 ◽  
Vol 14 (1) ◽  
pp. 240-246 ◽  
Author(s):  
Luis A. V. Izquierdo ◽  
Francyle S. H. Sanches ◽  
Francisco Molina ◽  
Rafael P. Henriques ◽  
Emerson F. Cruz ◽  
...  
Keyword(s):  
Standard Deviation ◽  
Injection Molding ◽  
Bond Strength ◽  
Shear Bond Strength ◽  
Testing Machine ◽  
Maximum Load ◽  
Metal Injection Molding ◽  
Intergroup Comparison ◽  
Mim Technology

Introduction: Brackets bonded to enamel surface depend on the adhesion material and the quality of the bracket base. Objective: The aim of this study was to compare the shear bond strength of metallic brackets with Metal Injection Molding (MIM) technology base or welded base. Materials and Methods: Forty mandibular extracted premolars mounted in acrylic resin blocks were divided randomly into two groups, both bonded with Transbond XT. In Group 1, brackets with MIM technology bases (Masel) were used, and in group 2, brackets with a welded base (Morelli) were used. After 24 hours, all brackets were tested for shear bond strength in a universal testing machine. Intergroup comparison was performed with an independent t test. Results: MIM base brackets showed a mean maximum load registered of 107.55 N, a mean shear bond strength of 9.58 MPa with a standard deviation of 5.80 MPa and the welded base brackets showed a mean maximum load of 167.37 N, a mean shear bond strength of 13.28 MPa with a standard deviation of 2.58 MPa. The difference between the two groups was statistically significant, indicating a higher shear bond strength of the welded base brackets. Conclusion: It was concluded that the brackets with welded bases presented a significantly higher shear bond strength than the brackets with MIM bases.

Metal Injection Molding of Nickel-Free Austenitic Stainless-Steels I-Manufacturing Process

2007 ◽  
Vol 26-28 ◽  
pp. 15-18
Author(s):  
Yoshikazu Kuroda ◽  
Midori Komada ◽  
Ryo Murakami ◽  
Shingo Fukumoto ◽  
Noriyuki Tsuchida ◽  
...  
Keyword(s):  
Injection Molding ◽  
Austenitic Stainless Steels ◽  
High Strength ◽  
Austenitic Steels ◽  
Metal Injection Molding ◽  
High Nitrogen ◽  
Molding Method ◽  
Combined Use ◽  
Work Hardening Rate ◽  
Near Net Shape

Ni-free austenitic steels containing high nitrogen have been developed to protect against earth resource. High nitrogen steels (HNS) have a lot of advantages, e.g., HNS have high strength, corrosion resistance, toughness, work hardening rate and large rocking parameter in the Hall-Petch equation. On the other hand, it is difficult to fabricate HNS by IM method under 0.1 MPa and to work at room temperature. We have tried to make HNS by combined use of metal injection molding method (MIM) and nitrogen absorption method. Powder compositions used was Fe-17Cr-12Mn-3Mo.The benefit of this method is to make metal parts in near net shape. In order to use this method, we should know the sintering heat schedule, timing for introducing nitrogen gas, gas pressure and setter material etc. Therefore, the shrinkage rate, density and the solution-treated microstructure of MIM compacts were examined to find out the optimum conditions.

Development of Ultra-Fluid Compositions of Feedstock for Metal Injection Molding

2020 ◽  
Vol 992 ◽  
pp. 529-533
Author(s):  
A.Yu. Korotchenko ◽  
D.E. Khilkov ◽  
M.V. Tverskoy ◽  
A.A. Khilkova
Keyword(s):  
Injection Molding ◽  
Metal Powder ◽  
Large Particle ◽  
Metal Injection Molding ◽  
Particle Sizes ◽  
Pressing Pressure ◽  
Compression Pressure ◽  
Powder Mixtures ◽  
The Cost ◽  
Mim Technology

In this paper, to reduce the cost of production of parts by injection molding technology of metal powder mixtures (MIM technology), it is proposed to use metal powder mixtures (feedstock) with high fluidity for the manufacture of green parts. High fluidity is achieved by increasing the proportion of paraffin wax in the binder. This can significantly reduce the pressing pressure when pressing the feedstock into the mold cavity to values less than 1 bar, and eliminate the use of expensive injection molding machines with high compression pressure. High fluidity also allows the use of powders with large particle sizes, which significantly reduces the cost of feedstock. The absence of high pressure on the mold walls during the pressing of the feedstock allows the use of molds made of cheaper materials such as silicone, plastic, gypsum and others.

The Status of Magnesium Injection Molding in China

2019 ◽  
Vol 285 ◽  
pp. 436-440 ◽  
Author(s):  
Yi Bing Zhu ◽  
Stephen P. Midson
Keyword(s):  
Injection Molding ◽  
New Technology ◽  
Casting Process ◽  
Injection Molding Process ◽  
Solid Alloy ◽  
Molding Process ◽  
The Status ◽  
Near Net Shape ◽  
Semi Solid ◽  
Plastic Injection

Thixomolding, or magnesium injection molding as it is more generally known, is an established semi-solid casting process for producing thin-walled near net shape components from magnesium alloys. Magnesium injection molding produces components using a machine similar to a plastic injection molder, where magnesium-alloy chips are feed into the back end, and a rotating screw feeds the chips forward as they are heated to the semi-solid temperature range. The semi-solid alloy collects in a nozzle at the front of the screw, where it is then injected into a re-usable steel die. This paper will initially describe the commercial status of magnesium injection molding in China, and will review several types of components being produced commercially. Comparisons to conventional hot chamber magnesium die casting will be made, and a new magnesium injection molding machine design that incorporates an intensifier will be introduced. In addition, new technology trends utilizing the magnesium injection molding process will be described. One such application involves the magnesium injection molding of Mg-Li alloys. Lithium has the lowest density of all metals, and so the addition of lithium further reduces the density of the magnesium.

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