Multi-Feed Technology Offers Choice of Tool Feed Methods

Sunnen's multi-feed honing technology gives users a revolutionary choice of tool-feed modes to achieve the shortest cycle times, lowest part cost and longest abrasive life.

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Sunnen's multi-feed honing technology gives users a revolutionary choice of tool-feed modes to achieve the shortest cycle times, lowest part cost and longest abrasive life. Multi-feed combines new controlled-force tool-feed with its controlled-rate feed system. The two different tool-feed modes allow the user to select the better option to suit the workpiece geometry, material and tool type/size.

Controlled-force honing, a new feature in multi-feed, works like cruise control to ensure the optimum cutting load on the honing abrasive throughout a cycle, irrespective of the incoming part's hardness, geometry or size variation. Depending on the application, controlled-force honing cuts cycle times by as much as 50 percent, lengthens abrasive life for lower consumable cost, and allows finer control of surface finish parameters than ever before possible. Controlled-force technology eliminates glazing of the abrasive, because of too little force, and maintains a steady, free-cutting, self-dressing condition for maximum metal removal in the shortest possible cycle time.

Controlled-force is an ideal choice for applications using segmented diamond or superabrasive honing tools or where incoming workpieces have slight variations in hole diameters, hardness and geometry, the company says. Controlled-force's ability to control the cutting load within a very fine range also allows much tighter control of final surface finish parameters. Controlled-force honing works with the company’s MMT, PH and new KRQ tools.

Controlled-force honing is an enhancement of the controlled-rate system for tool wear compensation, which is already capable of adjusting tool size in increments as fine as 0.1 µm (0.000010"). Controlled-rate tool feeding is typically used with plated-diamond CGT honing tools, which use a sleeve of abrasive for full contact with the bore surface. CGT tools are frequently used on cast iron and powder metal workpieces, segmented bores, or parts with multiple lands, ports, keyways or crossholes in the bore. The machine control provides as many as five feed expansion profiles that can be used during a cycle for rapid part touch, cutting, sizing, finishing and spark-out.