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MOLLART SUPPLIES FAMILY OF MOULD TOOL BLANKS TO UK AUTOMOTIVE INDUSTRY

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SubjectMOLLART SUPPLIES FAMILY OF MOULD TOOL BLANKS TO UK AUTOMOTIVE INDUSTRY
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MOLLART SUPPLIES FAMILY OF MOULD TOOL BLANKS TO UK AUTOMOTIVE INDUSTRY
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The ability to satisfy a short delivery requirement by combining into a single operational cycle, deep hole drilling and milling operations, Mollart Engineering’s subcontract division has secured orders from a UK automotive company to produce a family of mould blanks having up to 30 interconnecting cooling holes drilled from five faces of the component.


Said Mike Pragnell, Operations Director of the Chessington facility: “There are 16 different moulds in the family that range in size from 2,000 mm by 1,500 mm by 300 mm to 750 mm by 750 mm by 100 mm.  Because of our in-house development of a 5-axis Centeplex and two 4-axis Prismabore PRB machines, each having individual spindles one for deep hole drilling and the other for CNC milling, we are able to mill faces and features, drill, threadmill portings and create sealing faces in a single operation on parts weighing up to 5 tonnes.  This has given us an important advantage in this type of application.”


Each of the heat-treatable steel moulds had a variety of 16 mm diameter holes for watercooling with depths up to 1,500 mm.  Most of the holes were interconnecting to enable efficient water flow and here the gundrill process ensures accurate breakthrough with minimal runout (normally within 0.025 mm per 25 mm depth) that reduces any mismatch.


Mollart has the capability to drill deep holes between 0.5 mm and 60 mm diameter on these multi-axis combination machines to depths of 3,000 mm and at compound angles up to +/- 15 deg. However, with probing to re-datum the workpiece, parts can be indexed 180 deg around the machine table and drilled from the opposite end to enable overall drilling depths of 6,000 mm to be attained.


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