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LMT Forms The Perfect Result for Piston Rod Threading

LMT Forms The Perfect Result for Piston Rod Threading

Added to MTDCNC by LMT UK Ltd on 08 October 2016

The new solid carbide thread forming solution from LMT Tools has been developed to give the perfect composition balance for large-scale production. The new threading line provides more efficient and reliable processes for threading automotive piston rods whilst delivering exceptional tool life.

Engine development in recent years has focused upon increasing the ignition pressure and speed of the engine. In the everyday automotive engine, there are few  components as directly exposed to these forces as the piston rod. The piston rod is a central element that transmits motion, making it a critical factor of any engine.

In view of the evolving automotive industry requirements, the manufacturers have continually moved to high-strength materials. However, this also creates some unique challenges that increase the requirements in production. The strength of the material reduces the life of the cutting tools and this results in increased tooling costs and reduced process reliability. 

To counteract the impact of this industry trend, the experts at LMT Tools have created specialist tooling solutions that are an exact fit to the application. For piston rod production, this is demonstrated by the development of a solid carbide thread former for a German engine manufacturer. Explaining the process LMT's Michael Rechtziegler says: "The customer approached us because the tool life of the previous HSSE-PM thread formers for machining M8x1 piston rod threads were too short."

"The tool had to be replaced after manufacturing 2,800 threads or 1,400 piston rods." The specialists from LMT then developed a new forming tap and matched its solid carbide grade and geometry to the 12mm deep M8x1 piston rod thread. The thread forming tool was matched to the (70MnVS4 + 46MnVS5) piston rod material and the machining parameters. The cutting speed remained unchanged at 18 m/min with the end user applying a minimum quantity lubrication (MQL) strategy.

Michael Rechtziegler continues: "This strategy enabled us to achieve a substantial increase in tool life with our forming taps. With immediate effect, the tool now only needs to be replaced after every 32,000 threads, a grand total of over 16,000 piston rods. The customer benefits from the significant reduction in the costs per piece and improved machine utilisation. At the same time, the quality of the threads with their press-finished flanks is excellent."


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