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Parmaco - Metal Injection Molding (MIM) Components

Parmaco is an experienced developer and producer of metal injection molding (MIM) components. Our expertise in this area allows us to deliver the best advice to customers and help master challenging projects.
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Parmaco - About

Parmaco is an experienced developer and producer of metal injection molding (MIM) components. Our expertise in this area allows us to deliver the best advice to customers and help master challenging projects.

MIM components for medical devices

The main highlights of our company include:

  • In-house material and process development
  • Rapid prototyping capabilities
  • In-house mould design
  • In-house feedstock mixing
  • Complete MIM and micro-MIM process lines: mixing, molding, debinding, sintering, secondary operations, assembly
  • Many applications in the medical field
  • Wide range of materials

To create a flexible injection molding process, we mix all feedstocks in-house. Not only does this enable us with the independence of feedstock vendors, but it also allows us to design feedstocks according to the part’s specific requirements. Parmaco exploits these possibilities to optimise processes as well as benefit customers’ material developments.

Due to the specific equipment and the intensive development we have made in miniaturised MIM components, Parmaco is a leader in this field. We are committed to staying at the forefront of MIM and micro-MIM technology.

Components for medical applications used in eye surgery instruments, dental equipment or liquid dispenser systems. These parts weigh about 1g

Combining plastic injection molding and metal powder sintering

Metal injection molding combines two technologies: plastic injection molding and metal power sintering. The plastic injection molding technique has been known for many years and is used in the production of complex-shaped plastic parts. Plastic injection molding has revolutionised molding in the field of plastics.

The technology of metal powder sintering (P/M process) has also been used for many years, to produce metal parts of various alloys of metal powders. P/M is an economic process for the production of relatively simply shaped metal parts.

Parmaco’s metal injection molding process has nearly no limits for shape complexity. This image shows a lens component for a measuring device. Its diameter is 46mm

Advantages of a metal injection molding processes

  • Complex medical components using metal injection molding
  • Complex-shaped parts can be manufactured without or with only very little secondary finishing
  • Undercuts, which are not possible with conventional sintering processes, can be achieved with MIM
  • The Parmaco process delivers extremely accurate reproduction of even the finest mould cavities
  • The extremely flowable material also allows the forming of sharp edges

High-density MIM components

In contrast to conventional compression and sintering, which usually allows densities of 90% of the theoretical material density, the metal injection molding process reaches densities of between 96% and 100% of the theoretical material density. Material properties reached largely correspond to those of parts processed entirely of metal.

The surface of MIM parts is far superior to that of precision cast parts. A roughness of better than Ra 3.2 is reached without polishing. Thus, finishing and polishing costs can be eliminated or substantially reduced.

MIM parts with low tolerance limits

The metal injection molding process allows an accuracy of greater than +/-0.3% of the required dimensions. This means that the accuracy of small parts can be in the range of hundredths of a millimetre. Calibrating or secondary finishing may become necessary with parts of larger dimensions.

These fixture components weigh about 26g. They have an internal gear in the T section and a thread in the bottom of the housing

Wide material selection for metal injection molding manufacturing

MIM parts usually do not have to be mechanically refinished. The harder it is for a material to be machined, the more advantageous the metal injection molding process. In particular stainless steel, soft magnetic alloys, iron/nickel materials and also tool steel and special purpose alloys can be employed. Hardening of MIM parts is also possible. All surface treatment processes such as nickel plating, hard chroming etc., can also be applied. In fact, any treatment that can be applied to machined components can also be applied to MIM components of the same alloy.

This is a selection of micro-MIM parts. They are for applications in surgical instruments, micro gears, laser equipment and electronic devices

Cost-efficient MIM and micro-MIM components

It is often possible to reduce the number of parts required for a constructional unit in order to eliminate the machining costs for conventionally manufactured parts or to significantly increase the quality of the constructional unit by selecting the appropriate material. All of this can lead to substantial cost savings.

It is advisable to evaluate MIM as a manufacturing route in the early project stage in order to exploit its potential to the fullest.

Gold plated electrical contact pins for measuring devices with a weight of only 0.03g

Contact details:

Metal Injection Molding AG
Fischingerstrasse 75
CH-8376 Fischingen
Phone : +41 71 978 78 78
Fax : +41 71 978 78 79

MIM – “Injection Molding” of Precision Steel Parts

For the Production of small, sophisticated metal parts there are a great deal of different processes like various injection methods, powder-metallurgic production with the conventional press & sinter process or machining. Each of these methods has certain advantages and disadvantages, which determine the boundaries of use. An interesting alternative is the Metal Injection Molding (MIM) process, which specializes in the mass production of small, highly sophisticated steel parts with a relatively complex geometry.

Georg N. Breitenmoser, CEO of Parmaco Metal Injection Molding AG in Fischingen (Switzerland), states: "Our manufacturing process is pretty similar to the conventional injection molding of plastic parts, which is why it allows us the same freedom of design." The SME is specialized in the production of sophisticated components of customized steels and special alloys,…
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Published on April 17, 2015
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