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Nut
E420 for tightener assembly
Company Name:
Parmaco
Metal Injection Molding AG
Address: Fischingerstrasse 75 CH-8375 Fischingen Switzerland
Tel: +41 71 977 21 41
Fax: +41 71 977 21 22
Contact: Georg N. Breitenmoser
End-User
Company: SFS intec AG
Composition of PM Product: The Feedstock is made from 93%
elemental Fe- and 7% elemental Ni-powder, mixed with wax based binder
materials.
Component weight:
starting weight: 6.36g
finished weight: 5.77 g
Powder consolidation technique: MIM technology
Type of tooling used: 2 cavity injection mould
Consolidation pressure: 1400 bar
Temperature for sintering: Sintered in reducing atmosphere.
Top temperature is 1200°C.
Final density: > 7.8 g/cm3
Relative density: > 99%
Finishing: 1. case hardening, 2. anti friction coating
Final product properties:
Density: > 7.8 g/cm3
Surface hardness: HV1 600+100, case depth 0.3+0.2 mm 11.
Above properties are after case hardening
Date of first production: 2002
Annual production quantity: 20'000 pcs.
The Nuts belongs into a new tightener system for special self drilling
flat head screws for façade construction. Two nuts are mounted into
a sleeve and form the clamp which encloses the flat head screw.
The flat head screws have a special contour for the transmission
of the tightening force. The negative of this contour is built into
the nuts in order to allow for optimal grip. This negative contour
is very fine and requires a highly wear resistant material.
During the initial phase of the project the nuts had been machined.
When the project entered into its second stage volumes increased
and a cheaper production method had to be found. Only MIM was able
to cost effectively reproduce the intricate and precise contours
that are required to guarantee the function for the specified service
life of 2000-5000 tightening operations.
For cost reasons the Nuts are made from 7% NiFe. In order to achieve
the required service life it is important that the density is above
7.8 g/cm3. Furthermore close attention to the hardening procedure
and the subsequent anti friction coating procedure is required.
In comparison to the manufacture by machining MIM results in cost
savings of 85%. Although the annual production volumes of today
about 20'000 pieces are relatively small, MIM is able to generate
big cost savings.
The Nuts are a good example for MIM's ability to give very
cost effectively shape to designer's imagination and to produce
highly wear resistant components even from materials which are conventionally
not thought for such applications.
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