Extruder Screws

In today's injection mold industry, designs of multi-segmented Extruder Screws are more complexed than ever, and so are the demands on how these screws are to be manufactured. Ideally removing the maximum amount of material in the shortest possible time, while still leaving a high quality surface finish thus eliminating not only a costly but, very time consuming grinding operation.
Now those previously unattainable goals have all come together into one advanced machine from Leistritz, the LWNM multipurpose machining center line. This CNC controlled multipurpose machine combines Whirling, Milling and Turning all on a single space saving vertical bed design.
Ralph Wehmann, National Sales Manager of machine tool sales at Leistritz Corporation, describes the advantages of this multipurpose machine: "Whirling is the fastest machining method for producing extruder screws, and if you compare whirling with milling, there is a big improvement in surface finish due to the smooth tangential cutting action you get by whirling." By improving profile finish, there is an elimination or at least a reduction in the need to grind or hand polish. Since these operations are normally very time consuming, the cost savings can be tremendous.