2010 Full-Line Drill Catalog - Desanto

Adjustable, multi-fluted PCD-tipped reamersEfficient parent metal machining ofvalve seat and valve guide boresPCD and CBN ToolsThe parent metal machining of valveseat and valve guide bores in a cylinderhead belongs to the most demandingmachining tasks in the automotive industry.Due to the high demands forcircularity, form accuracy and concen-is the classic tool for this machiningtask as it guarantees the required precisionwith a long tool life. The tool, however,has its limits regards satisfyingthe demand for reducing the cycle timebecause it has only one flute.For this reason, Guhring has develo-PCD-tipped two step reamer that optimallysatisfies the demand for the efficientparent metal machining of valveseat and valve guide bores: long tool life through the diametersetting at the cutting edges of bothsteps. multiple flutes and optimal cooling. tingof both steps can be carried outwhile the tool is clamped.Perfect results thanks to optimal tooldesignA multi-flute, PCD-tipped two step reameris applied for the parent metal machiningof the valve seat and the valveguide bores in one setting. Two tools ofidentical design are applied for the machiningof the inlet and exhaust valve. bore of 28.5 mm diameter and thevalve guide bore of 11 mm diameter,each with 6 flutes. Both step diame-each other. of 35.5 mm diameter and the valveguide bore of 11 mm diameter, eachwith 6 flutes. Both step diameters can other. tediameter setting when the tool is of both diameters at any time. Subsequently,it also results in increasedtool life. reliable and compliant process withthe demand for circularity, form accuracyand concentricity and an extremelylong tool life with high cuttingrates. mallubrication of the cutting edgesand supports the chip evacuation.252