SCHUNK ex­pands prod­uct range

Auto components India - - COVER STORY - ACI Bureau ACI

SCHUNK, man­u­fac­turer of grip­ping sys­tems and clamp­ing tech­nol­ogy has ex­panded its prod­uct range with a sealed 6-jaw pen­du­lum com­pen­sa­tion chuck for clamp­ing de­for­ma­tion-sen­si­tive work­pieces. The spe­cial seals lo­cated on the ser­rated jaw in­ter­face and pis­tons of the SCHUNK ROTA NCR-A pre­vent grease from be­ing flushed out and the clamp­ing force from be­ing grad­u­ally lost. Pre­cise chuck func­tion is en­sured, even at low clamp­ing forces. In ad­di­tion, the seal pre­vents chips or dirt from get­ting into the chuck body. This in­creases process re­li­a­bil­ity and length­ens main­te­nance in­ter­vals, trans­lat­ing into less fre­quent lu­bri­ca­tion and clean­ing of the lathe chuck.

The SCHUNK ROTA NCR-A con­sists of a cen­tral chuck pis­ton car­ry­ing 3 in­ner pen­du­lums aligned at 120°. Each pen­du­lum is con­nected to 2 base jaws. This en­sures work­piece cen­tring be­tween 6 con­tact points, which can be ad­justed in pairs. As the clamp­ing forces are di­rected to­wards the chuck cen­tre, op­ti­mal cen­ter­ing is achieved with­out dis­tor­tion of the work­piece. The chuck per­fectly ad­justs to the work­piece with its os­cil­lat­ing jaws. With con­ven­tional jaw clamp­ing, this con­fig­u­ra­tion al­lows for max­i­mum con­cen­tric­ity of the work­pieces and en­sures op­ti­mal cen­tring at the same time.

In the case of ring-shaped work­pieces, de­for­ma­tion is re­duced by a fac­tor of 10 as com­pared to clamp­ing with 3-jaw chucks. Users can also clamp the pen­du­lum of the ROTA NCR-A in the cen­tre po­si­tion dur­ing the fi­nal pro­cess­ing stage or when clamp­ing pre-turned sur­faces so that all 6 jaws move con­cen­tri­cally. The clamp­ing force be­tween the first and sec­ond clamp­ing can be ad­justed by means of a pres­sure re­duc­tion at the hy­draulic cylin­der. An ex­tremely rigid chuck body and long jaw guid­ance en­sure high re­peat ac­cu­racy and pre­cise re­sults.

Stan­dard jaws can be used to re­place elab­o­rate sys­tem jaws and spe­cial solutions on the ROTA NCR-A jaw in­ter­face. This saves time and cost-in­ten­sive spe­cial solutions, in­creases flex­i­bil­ity, and re­duces set-up costs. Be­cause of its high pre­ci­sion, it is pos­si­ble to elim­i­nate en­tire pro­duc­tion steps, for ex­am­ple, by reach­ing tol­er­ances dur­ing the fin­ish­ing process that would oth­er­wise only be reached in com­plex grind­ing op­er­a­tions. Since the chuck has a very flat de­sign, there is plenty of workspace in your ma­chine for the work­piece and the ma­chin­ing pro­ce­dures.

The com­pany is also of­fer­ing a range of di­verse claw and stepped jaw mod­els for raw part clamp­ing from the world’s largest range of stan­dard chuck jaws also op­tion­ally as a light­weight ver­sion. De­pend­ing on the jaw type, the user can save around 40% of the weight but com­pletely re­tain all of the char­ac­ter­is­tics of the stan­dard jaws, such as sta­bil­ity.

The light­weight chuck jaws pri­mar­ily re­duce the ef­fects of cen­trifu­gal force at high speeds, which re­duces the loss of clamp­ing force and in­creases process re­li­a­bil­ity. Al­ter­na­tively, parts that are sen­si­tive to de­for­ma­tion re­quire lower clamp­ing forces in or­der to ma­chine work­pieces in a process-sta­ble way. Other ad­van­tages are im­prove­ments to the in­ter­fer­ing con­tour as well as en­ergy sav­ing since less mass is ac­cel­er­ated and slowed down. The weight-re­duced chuck jaws there­fore pro­vide the ideal pre­con­di­tions for the use on light­weight lathe chucks such as the SCHUNK ROTA NCE and on con­ven­tional lathe chucks with fine ser­ra­tion or tongue and groove.

SCHUNK’s 6-jaw pen­du­lum com­pen­sa­tion chuck

SCHUNK light­weight jaw

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