Advancements in Single-Pass Bore Finishing - Systems Approach (pag. 9 of 10)

Advancements Manufacturers are continually pushing the envelope in regards to what can be accomplished with the singlepass Processo. Improved tool, fixture, and machine designs have allowed for increased production rates as well as improved bore precision. The following are some of the latest advancements that have been made. Automation and Automatic Tool Adjustment: Various automation, autogaging, and autotool size compensation systems have been developed for the singlepass Processo, each designed to further reduce labor costs. Case history #8 illustrates one particular Applicazioni in which the component manufacturer desired to have each finishing cell completely automated so that one operator could oversee a couple of cells at a time. Included in each cell are one singlepass bore finishing system; one O.D. rettifica machine; one O.D. crowning machine; one automatic gage; and one robotic automation package. The automatic gage is set up to inspect bore size; O.D. size; face runout to the bore; and O.D. to bore concentricity. Information from these measurements is used to automatically adjust the rettifica and bore finishing sizes when necessary. To automatically adjust the singlepass, bore finishing tooling, the robot first automatically changes its end of arm tooling and then proceeds to turn the front adjusting nut on each individual tool as needed. The robot then changes the end of arm tooling back to the grippers, loads a new part, and continues on with the automatic cycle. Other forms of automatically adjusting the singlepass tooling include using a draw bar through each spindle to move the tapered Mandrini in relationship to the sleeve.

Diameter:	20.048mm	Length:	165mm
Material:	Silicon Nitride	Hardness:
Bore Type:	Thru	Stock Removal:	0.85mm
Tool Pass #1:	19.452mm	Diamond Size:	40/45
Tool Pass #2:	19.702mm	Diamond Size:	40/45
Tool Pass #3:	19.952mm	Diamond Size:	40/45
Tool Pass #4:	20.027mm	Diamond Size:	60/80
Tool Pass #5:	20.041mm	Diamond Size:	200/230
Tool Pass #6:	20.048mm	Diamond Size:	320/400

Bore Quality	Required	Achieved
Size:	.005mm	0.003mm
Roundness:	.005mm	.003mm
Surface Finish:	0.2Ra	0.1Ra

Machine Type:	Engis Model # 0318-1UM6 (6 Spindle Machine)
Coolant:	Water Based
Production:	80 Parts Per Hour