Mapal Fine boring tools for valve housings optimise productivity

Editor: Briggette Jaya

Germany – In automatic transmissions, the switching unit is the central component that controls the clutch and the brake for changing gears and the speed of the vehicle.

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Multi-bladed PCD fine boring tools said to offer an individually tailored concept for productive machining of valve housings.
Multi-bladed PCD fine boring tools said to offer an individually tailored concept for productive machining of valve housings.
(Source: Mapal)

Similarly, in manufacturing, the valve bores play a central role in the switchgear housing. And to increase productivity during machining, Mapal has developed multi-bladed PCD tools with permanently brazed cutting edges.

The housings consist mainly of a die cast-aluminium alloy, which Mapal says is dependant on its manufacturing quality. The tolerances of the cylinder form of below 8 μm, roundness below 4 μm and surface finish with radii below 3 μm have to be reliably achieved during production, which are offered mostly by stepped valve bores.

Their machining is divided into several machining sequences, with different tools for piloting, semi-finishing and finishing, Mapal explains.

As maximum precision is not needed for every valve bore, the company offers permanently brazed PCD fine boring tools that reduce process time and a minimally extended tolerance range.

Moreover, these tools are said to eliminate the need for fine adjustment of the cutting edges.

For intermediate machining, four-edged PCD tools with brazed cutting edges shorten processing times and positional accuracy is also achieved, Mapal says. Furthermore, three to six-edged fixed PCD fine boring tools are available for finishing work which can improve cycle times with almost the same precision.

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