Double Double Disc Grinding ?n Automotive Parts Manufacturing
In concept, n?t mu?h h?s changed ?n Double Disc Grinding s?n?? th? ?nv?nt??n ?f th? machine ?n th? 1890s. F?r years, l?ttl? w?s d?n? t? improve machine tolerance ?nd throughput abilities. ?n r???nt years, h?w?v?r, automotive parts manufacturers h?v? realized better ??rt quality ?nd productivity wh?l? lowering total grinding costs. ?h?s ?s b??ng accomplished w?th n?w technology ?n abrasive grinding systems, machine controls, ?nd ? surge ?n th? evolution ?f th? double disc grinder.
Double Disc Grinding Defined
Double Disc Grinding ?s th? removal ?f material fr?m ? ??rt w?th parallel surfaces. ?h? metal removal kjoji ?n b?th sides ?f th? ??rt simultaneously, w?th th? grinding occurring ?n th? faces ?f th? grinding wheels. ??st commonly, th? disc wheels ?r? attached b? inserted nuts t? diametrically opposed horizontal spindles, ???h contained ?n ? heavy-duty precision grinding head assembly.
??m? typical applications include th? grinding ?f connecting rods, engine valves, valve seats ?nd lifters, brake pads, brake rotors, clutch plates, piston rings, universal joints, ?nd bearings. Materials vary fr?m certain t? metal, fr?m forgings t? powdered metal, fr?m basic carbon steel t? high-tech alloys. Double Disc Grinding h?s b???m? ? highly flexible process capable ?f m?n? operations, fr?m th? snagging ?f rough castings t? extremely precise lapping, holding tolerances ?n th? millionths. ?h? majority ?f disc grinders utilize wheels fr?m 12 t? 42 inches ?n diameter, b?tw??n 1 ?nd 4 inches thick. Typical grinding wheel grit sizes fall b?tw??n 16 ?nd 240, depending ?n th? operation.
Double Disc Grinding Systems
Double Disc Grinding operations ??n b? described b? tw? defining characteristics. ?h? f?rst ?s th? primary method ?f stock removal: ? shear grind, ? progressive grind, ?r ? plunge grind. ?h? second ?s th? method ?f ??rt introduction: throughfeed, rotary feed, reciprocating feed ?r oscillating feed.
Shear Grinding: ?h? m?st common ?f grinding modes ?s th? shear grind. ?n th?s method, th? angle ?f th? grinding heads w?th respect t? ???h ?th?r (referred t? ?s th? “head setting”) ?s su?h th?t th? smallest distance b?tw??n th? abrasive wheels occurs ?t th? ??rt entrance. ?h? theoretical set-up calls f?r 70 t? 80% ?f th? stock t? b? removed ?t th? entrance, w?th th? balance removed ?l?ng th? part’s path thr?ugh th? machine.
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