Mould clamping
- Easy clamping of complicated workpieces - with Weiguss®
After sucking down the raw workpiece machining can begin, starting with the outer contour. In order to maintain maximum suction on workpiece as long as possible initially no through-milling should be carried out.
Centering holes are drilled.
After finishing the first side of the workpiece the hollows are filled with alloy LM 70 which has been melted at 70° C. It is important not to overfill the cavity otherwise optimal clamping of the filled surface on a vacuum chuck for second machining procedure will not be possible.
After LM 70 alloy has cooled down part is turned over and positioned using centering bores then clamped. The second side is now ready to be machined.. As you can see on the photo the workpiece is fully bedded in LM 70. Sliding caused by milling forces is avoided completely enabling machining without vibration.
The photo on the right shows how the finished workpiece is held and clamped in LM 70.
All sides have been machined. The workpiece now only needs to be immersed in hot water to remelt the alloy and release the workpiece.
User only requires a hotplate, water and an ordinary bowl for melting process.
The finished parts only need gentle cleaning in hot water using a brush.
After allowing the melted LM 70 alloy to cool down in the water it is removed and can be used again and again for future workpieces.
As you can see on the following pictures mould clamping technology is ideal for small series.
Mould clamping technology is ideal for all machineable materials such as steel, CrNi steels, titanium, non-steel metals and plastics.
It is of course possible to clamp workpieces using vises, clamps, three-jaw-chucks or similar conventional elements. For 2D or 3D workpieces it is also common to have complicated special fixtures made. However, using mould clamping technology even elaborate 5 axis machining with recess cuts is made easy.
Actual clamping takes place due to alloy expanding by theoretical dimension of 0,3 to 0,4% in all directions during cooling. There are no adhesive forces but real clamping force similar to a vise.
This clamping technology enables machining of complicated workpieces with spherical surfaces and filigree ridges. For example for slides for series moulding tools. Coolant spray can be used at any time during machining.
Design by Andreas Wolf
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