MIM Components denote metal elements manufactured through the metal injection molding process. MIM, or Metal Injection Molding, represents an innovative metalworking technology. In comparison to established metalworking techniques like forging, die casting, and CNC machining, MIM excels in the production of small-sized, intricately structured metal components in large quantities. FTMIM specializes in the production of diverse MIM parts using a broad spectrum of materials, with common MIM materials encompassing Ferrous alloys, Tungsten alloys, Nickel alloys, Molybdenum alloys, Titanium alloys, and more.

Advantages of MIM Parts

Metal injection molding utilizes a feedstock composed of fine-powdered metal and binder materials. This blend is melted, and the resulting mixture is shaped into various intricate structures through the injection molding process. The molding process incorporates high tolerance and multiple cavities, enabling the production of high-volume molded parts (green parts) in a single step. Following molding, the binder materials are removed in the debinding process (brown parts), and the metal powders are compacted in the sintering process. Ultimately, this yields net-shape metal parts with a high density of 98%.

Simple Material Substitution

In the MIM process, fine-powered metal particles are typically used in the feedstock. Consequently, it becomes possible to choose diverse feedstock containing various metal alloy powders for the production of MIM parts with different metals. Setting aside other implementation considerations, it’s quite straightforward to generate MIM parts with the same structure using various metal materials. The only factor requiring attention for optimal final part performance is the sintering temperature, with no additional time or financial costs. This proves highly cost-effective for MIM projects, especially in new product development and the enhancement of product performance.

Streamlined Post-Manufacturing

MIM parts share identical physical and chemical properties with raw metal alloys. Therefore, any post-operations commonly conducted on forging or casting parts can be seamlessly applied to MIM parts. These include welding, soldering, hardening, tempering, polishing, machining, and milling. Each of these post-operations contributes to enhancing the surface performance of MIM parts in terms of both physical and mechanical properties.


In the majority of cases, sintered parts meet all customer requirements, including tensile strength, yield strength, surface hardness, etc. Nevertheless, for specific needs, we can employ polishing technology to enhance the surface roughness of MIM parts, heat treatment to improve hardness, and tempering to enhance elongation.

Micro MIM Parts Size

Unlike other conventional metalworking technologies, both powder metallurgy and metal injection molding are suitable for producing micro metal parts. However, it’s worth noting that MIM parts exhibit a more intricate geometric structure compared to PM parts.

Precision Manufacturing

MIM technology is well-suited for the production of small-sized metal parts, resulting in MIM parts characterized by smaller dimensions and higher tolerance compared to traditional metal components. Typically employed in automotive, electrical, medical, and other industrial devices, MIM parts play a crucial role in meeting common mechanical property requirements. Tolerance emerges as a key characteristic influencing the final functional performance of these parts. Nominal tolerances for MIM parts range from ±0.3% to ±0.5%, generally satisfying standard functional demands. For applications requiring even tighter tolerances, additional secondary operations are implemented to meet specific requirements. It’s important to note that such enhancements may incur additional costs and time.

Integrated Component Production

 MIM parts exhibit a complex structure with fewer limitations compared to die casting, powder metallurgy, machining, and forging parts. This advantage allows metal injection molding technology to create a singular part without the need for subsequent assembly of different components. In the product research and development process, engineers have the flexibility to consolidate various parts into a single component, resulting in savings in weight, cost, and time. Additionally, the consolidation of parts enhances the strength and overall performance of MIM components. Notably, MIM parts align more closely with the original design intent compared to assemblies of multiple parts.

Constraints of MIM Parts

Significant Initial Investment

While metal injection molding proves to be a cost-effective metalworking technology, the commencement of new projects entails a substantial upfront investment. The need for precision molds in the injection molding process, owing to the high tolerance and complex geometries of MIM parts, contributes to the higher cost of MIM tooling compared to alternative technologies such as PM and die casting. Additionally, the raw materials used in MIM are comparatively more expensive than those in PM, die casting, and machining. The feedstock in the MIM process contains finer metal powder (2-15 microns) as opposed to the coarser powder in PM (50-100 microns).

Technical Expertise

Given the high tolerance and intricate geometries inherent in MIM parts, the manufacturing process demands extensive expertise with meticulous control at every stage. Throughout the MIM manufacturing process, careful consideration is required for elements ranging from feedstock selection and injection molding to debinding, sintering, and final post-operations.


Feedstock Selection

Typically, our customers specify the metal alloy types based on desired properties. Alternatively, we may provide recommendations for the most suitable MIM material. This ensures that the chosen MIM material not only meets the required mechanical properties but also enhances surface performance and facilitates subsequent operations.


Injection Molding

During the design process, our engineering team carefully analyzes the geometry and structure of MIM parts to ensure their feasibility for injection molding. Several factors, including parting lines, undercuts, draft angles, and more, are taken into consideration for the actual injection molding process.

Debinding Process

Significant shrinkage takes place during the debinding process, and this shrinkage rate is influenced by materials, debinding temperature, and time. To address this, it is crucial to be well-versed in the shrinkage data of MIM materials based on past projects. Additionally, precise control of debinding temperature and time is essential. Our experienced team is adept at overcoming challenges and resolving issues encountered in the debinding process.

Debinding Procedure

A notable shrinkage occurs in the debinding process, and the extent of this shrinkage is influenced by factors such as materials, debinding temperature, and time. To navigate this, it is essential to have a comprehensive understanding of the shrinkage data specific to MIM materials, drawing insights from previous projects. Furthermore, meticulous control over debinding temperature and time is critical. Our seasoned team excels in addressing challenges and resolving issues that may arise during the debinding process.

Sintering Procedure

The physical and chemical properties of MIM parts are decisively shaped during the sintering process. Our engineering team is tasked with formulating an optimal sintering schedule tailored to the specific MIM materials in use. The data regarding sintering temperature and time is drawn from insights gained in previous projects involving similar MIM materials, injection molding, and debinding processes.


Post-Processing

In anticipation of the ultimate application of MIM parts, various post-processing techniques may be employed to enhance mechanical or other performance aspects, although in some cases, no post-processing may be necessary. These decisions need to be finalized before commencing MIM parts production. This underscores the importance of manufacturers possessing extensive experience in similar projects, enabling them to produce MIM parts with the requisite properties and tolerance levels.

Recommended reading:

1.Metal Injection Molding vs. Die Casting

2.History of Metal Injection Molding

3.Top 3 Metal Injection Molding Companies in China