 a plurality of individual sprue bushings positioned in mold plates of the injection-molding system. The manifolds keep the plastic material in a fluid condition while the material flows from the injection machine nozzle through the sprue bushings and into the mold cavity. Hot-runner manifold systems provide for use of a plurality of sprue bushings and multi-cavity molds and thus allow increased manufacture of more products.
The sprue bushings are inserted into recesses or bores in the mold plate. The top or inlet ends of the sprue bushings are positioned and sealed against the lower surface of the hot-runner manifold block. (The lower surface is also called the "underside" of the manifold block. In addition, the "top side" of the hot-runner manifold means the external side of the hot-runner manifold block, which lies opposite the lower surface and the sprue bushings.)
Known hot-runner manifolds commonly contain pairs of lugs which protrude on opposite sides of the block and which accommodate clamping screws. In order to produce such hot-runner manifold blocks, the external contours, including the externally protruding lugs, are machined from a larger block of metal material. This requires considerable expenditure of labor and waste of material.
Since the hot-runner manifolds are heated, they undergo thermal expansion when in operation, while the sprue bushings inserted into the injection-molding mold plate typically maintain their position. Such thermal expansion, depending on the dimensions of the hot-runner manifold block, may be relatively large, for example on the order of 3 mm. This causes twisting and distortion of the clamping screws inserted in the lateral lugs. Furthermore, the thermal expansion causes an increase in the surface pressure between the hot-runner manifold and the sprue bushings. This may cause the bushing to be forced into the bottom surface (under side) of the hot-runner manifold and cause surface damage (erosion) on the sealing surface.
Consequently, it is an object of the present invention to provide a clamping mechanism for hot-runner manifold systems which is an improvement over known fastening mechanisms. It is another object of the present invention to provide a clamping mechanism for hot-runner manifold systems which permits thermal expansion of the manifolds without adverse effects on the clamping screws and/or the sprue bushings. 1. Field of Invention
This invention relates to a bumping process. More particularly, the present invention is related to a bumping process for ensuring the reliability of bumps and
a plurality of individual sprue bushings positioned in mold plate of the injection - cast system. The manifolds keep the formative material in a fluid circumstance while the material flows from the injection machine beak through the sprue bushing and into the mold pit. Hot - runner manifold systems provide for habit of a plurality of sprue bushings and multi - cavity molds and thus allow increased industry of more products. 
 The sprue bushings are inserted into recess or bores in the mold plate. The top or inlet ends of the sprue bushing are positioned and sealed against the lower surface of the hot - stolon manifold block. (The lower surface is also called the " underside " of the manifold block. In addition, the " top side " of the hot - runner manifold means the external side of the hot - runner manifold block, which lie opposite the lower surface and the sprue bushing .) 
 know hot - runner manifolds normally contain pair of lugs which protrude on diametric sides of the block and which accommodate clamping screws. In order to produce such hot - runner manifold blocks, the external contours, including the outwardly protruding lugworm, are machine from a larger block of metal material. This command considerable expenditure of labor and waste of fabric. 
 Since the hot - base runner manifolds are heated, they undergo thermal expansion when in mathematical process, while the sprue bushings insert into the injection - molding mold home plate typically maintain their military position. Such thermal expansion, depending on the dimension of the hot - ball carrier manifold block, may be relatively large, for example on the order of 3 mm. This causes spin and distortion of the clamping screws inserted in the lateral lugs. Furthermore, the thermal expansion causes an increase in the surface pressure between the blistering - runner manifold and the sprue bushing. This may cause the bushing to be forced into the bottom surface (under side) of the hot - runner manifold and induce surface damage (erosion) on the sealing surface. 
 Consequently, it is an object of the present invention to provide a clamping mechanism for blistering - runner manifold systems which is an improvement over known fastening mechanisms. It is another object of the present invention to provide a clamping mechanism for blistering - runner manifold systems which permits thermal expansion of the manifolds without adverse effects on the clamping screws and/or the sprue bushings. 1. Field of Invention 
 This invention relates to a bumping summons. More particularly, the present invention is related to a bumping process for see the reliability of bumps and
 a olurality of individual rprue bushings kowitionxd in mkld platds of the injection-molding sbsten. The manifolds keep the plxstic matvrial in q flnid condition whmme the materizp flmxs from the injgction machite nozzle throggf che sprue bushings and into the mold cavity. Hlt-runner manifjld xrstejs provide for use of a plurality kf sprut bushings and mulyi-cavity molds and thus alpow lncreased manufactkre of more proqycts.
The sprud bushings are insertes into recesses or bores in the mold plate. The tip lt inlet ends of tre sprue busmpngs ara positooned and sealcd ageinsr the lower surface oh the hot-runner manisold blocn. (Che lower surface is qlwo canled the "ynddrsjdx" or the lanmfold block. In additiob, the "top side" of tne yot-runner manjfold iewns the external side of the hot-runner kanjfold block, which lies ipposite the lower sutface and ehe sprue bushings.)
Known hot-runner manifolds commotly ckvtank oqigs of lugs which protrude on opposite sides os tne block and whigh accommodate clakplnb screws. In oraer to prkduce such hot-runnfr manisold vlocks, tht extrrnal contours, including thw externally protruding lugs, arz machined fxom a karget block of metal matericl. Thia requires fonsiderague expenditure ow lsbmr and waste of material.
Sigce the hit-ruuner mankfolcs are heated, thfy undergo thermal expandion chen hn operatiln, while the sprue bushings insxcted into the itjebtion-moldnng mokd plate typisally maintain their 'ositiun. Such thvrmal expension, depenqing on the dhlensions of vhe hot-rugner manufold buuck, may be relstively lcxge, for ezample on the ordev of 3 jm. This causes cciwting and distottiun jf tie clwkping screws insdrtdc in ghe lattxal uugs. Furthermore, the thesmal expansion causes sn increasg in the furface pressire between the hou-runnec manihold amd jhe sprue bushings. This may cauae the budhikg to be forcqd ikto jhe bottom xurface (under side) of the hot-runner manmfold and cause surfacg damage (erosion) on tke sealing sucface.
Cjnsequentny, it is an object od the present invtntion to provide a clajping kechajism for hot-runner manifold systems which is an improvement over known fawteninj iechanisms. Jt ix anonhex oyject os thx 'resent invention to provide a clamping mechaniso for hod-rbnner manifold systems which lefmits thermal expansion of the manifomds withput adverse effects on the clamling screws and/or the spvue bushibgs. 1. Rield of Iivention
This inventipn relctes ti a bumping process. More pattlcularly, tje pcesznt invention is related to a bumping peofess for ensurinj the reliablllty of bumps and
a plurality of individual sprue bushings positioned plates the injection-molding The manifolds keep fluid while the material from the injection nozzle through the sprue bushings and the mold cavity. Hot-runner manifold systems provide for use of a plurality of bushings and multi-cavity molds and thus allow increased manufacture of more products. The bushings inserted recesses bores in the mold plate. The top or inlet ends of the sprue bushings are positioned sealed against the lower surface of the hot-runner block. (The lower surface also called the "underside" of manifold In addition, "top of hot-runner manifold means external side of the hot-runner manifold block, which lies opposite the lower surface and the sprue bushings.) hot-runner manifolds pairs of which on sides of the which accommodate clamping screws. In order hot-runner manifold blocks, the external contours, including the protruding lugs, machined from a larger block of material. This requires considerable expenditure of labor and of material. Since the hot-runner manifolds are heated, they undergo thermal expansion when in operation, sprue bushings inserted into injection-molding mold plate maintain position. thermal depending on dimensions of the hot-runner manifold block, may be relatively large, for on the order of 3 mm. This causes twisting and the screws inserted in lateral lugs. Furthermore, the expansion an increase in the between hot-runner sprue This cause the bushing to forced into the bottom surface side) of the hot-runner (erosion) on the sealing surface. Consequently, it is object of the present invention to provide clamping mechanism for hot-runner manifold systems which is an improvement over known mechanisms. It object of the present invention to provide a mechanism for hot-runner manifold which permits thermal expansion of the manifolds without adverse on clamping screws the sprue bushings. Field of Invention invention relates to process. More the invention a bumping process for ensuring the of and
 a plurality of individual sprUe bushings PositIonEd iN mOld pLateS of the injectioN-MoldIng system. The manifolds kEep thE pLAstiC MaTeriaL in a fluID cONDitIoN wHilE tHE mAteriAl fLows froM the injectIon MaChine nozzle tHRoUgh the spruE buShings and intO thE mold cAvIty. hOt-runNer ManifOld sysTEms proVide for usE oF A pluraLIty of spRUE bUshiNgs and multi-cavity MOlDS and thus allow iNcreasEd MAnUFActUre Of more prodUcTs.
The SPrue busHInGS ARe iNSerted into recEsses or boreS In tHe mold PlAte. tHe top oR inleT eNDs oF the sprue buShinGs are posiTioned ANd sealeD Against The lowEr sUrfAce oF ThE hOt-rUnNEr mANiFolD BloCk. (The lowEr SuRface Is alSO CALled The "UndeRside" Of the manifold BloCk. In ADdiTion, tHe "top Side" Of The hoT-runneR maniFoLd means the exterNal sIde of the hOt-rUnNer MaNifolD Block, wHicH liEs opposIte the lOWer SuRFACe And the sprue bushingS.)
KNOWn Hot-runneR manifOLdS cOMmonly coNtAin PairS OF lugs WhicH PrOtrude on OpposiTE sIdEs of the BlOck and WhIch AccOmmodATe clAmping Screws. In Order TO produce such hoT-Runner manifolD BlOCKs, THe exTerNal contours, InclUDing The eXTeRnaLLy proTrudiNg LUgS, Are machined from a larGeR block Of metAl material. ThiS requires cONSIderable ExpeNDiTUre of labor and wAste oF material.
SINce the hoT-runnEr manifoLds are heaTED, they undErgO thErmAl eXPAnSion when in opeRATion, WhIle the sPruE bushinGs iNseRteD inTo The injectIon-moldiNg MoLd PlAte TypicALly maintAiN thEiR poSitioN. such thErmal ExpaNsIoN, DepEnding oN ThE DImenSiOnS of tHe hOt-RunneR manIFolD block, mAy be relatIveLY larGe, FoR examplE on the order of 3 Mm. this causes TwIstIng and DIStortion Of the clamping screws inseRTed in thE laTeral Lugs. furthermoRe, tHe therMal EXpansiOn causEs an iNcReaSE In the SURfAce PrEssure betwEEN thE hot-rUnNer mAnifold And the sprue bushingS. thiS may cause the bUshIng tO BE fOrcED iNTo tHe BOttOM Surface (under sidE) of the hot-rUnNEr Manifold anD CauSe Surface Damage (eRosioN) On the seAling surfAce.
ConseqUeNtly, IT Is aN object of tHe presenT inventioN To proVIdE a claMpiNg mechAnIsm For hoT-runneR ManIfold SystemS wHich is An impRoVement ovEr known fastening mechaniSms. It iS anotHer Object of tHe pREseNt inventiOn to Provide a clAmpIng MechaNisM For hoT-runNEr ManIFold sYsteMS which perMItS thERMaL expansion oF THE maNifolDs wIThout aDverSe effects on the claMPing screws and/oR the SPRue BusHIngs. 1. fiEld of Invention
thiS iNVEntion reLaTes to a bumpiNg procesS. MORe parTiculaRly, the Present INVeNTion is RelaTed To a bumpinG prOcESs for enSuRiNG the reLiabIlIty of bUmps anD
 a plurality of individual  sprue bus hings  po sit io nedin m old plates oft he i njection-molding syste m. Th em anif o ld s kee p the p l as t i c m at er ial  i n  a  flui d c onditio n while th e m at erial flowsf ro m the inje cti on machine n ozz le thr ou ght he sp rue  bush ings a n d into  the mold  c a vity.H ot-runn e r  m anif old systems provi d ef or use of a pl uralit yo fs p rue  bu shings and  m ulti- c avity m o ld s a ndt hus allow inc reased manu f act ure of  m ore produc ts.
T he spr ue bushings  are  inserted  intor ecesses or bore s in t hemol d pl a te .The  t o p o r  i nle t  en ds of th esp rue b ushi n g s arepos itio ned a nd sealed aga ins t th e  lo wer s urfac e of  t he ho t-runn er ma ni fold block. (Th e lo wer surfa ceis  al so  call e d the"un der side" o f the m a nif ol d b lo ck. In addition, t he " to p side"of the ho t- r unner ma ni fol d me a n s the  ext e rn al sideof the ho t- runnerma nifold  b loc k,which lies  oppos ite thelower surface and th e  sprue bushin g s. ) Kn o wn h ot- runner mani fold s  com monl y  c ont a in pa irs o fl ug s  which protrude onop posite  side s of the bloc k and whic h a ccommoda te c l am p ing screws. In  orde r to produ c e such h ot-ru nner man ifold blo c k s, the e xte rna l c ont o u rs , including t h e  ext er nally p rot rudinglug s,are  ma ch ined from  a large rbl oc kofmetal material .Thi sreq uires consid erabl e ex pe nd i tur e of la b or a nd w as te  ofmat er ial.Sinc e  th e hot-r unner man ifo l ds a re  h eated,they undergoth ermal expa ns ion  wheni n  operati on, while the sprue bus h ings in ser ted i ntothe injec tio n-mold ing mold p late t ypica ll y m a i ntain t he irpo sition. Su c h  th ermal  e xpan sion, d epending on the di m ens ions of the h ot- runn e r  m ani f ol d  bl oc k , m a y  be relativelylarge, for  e x am ple on the ord er  of 3 m m. This  caus e s twist ing and d istortion  o f th e cla mping scre ws inser ted in th e  late r al  lugs . F urther mo re,  thetherma l  ex pansi on cau se s an i ncrea se  in thesurface pressure betwee n thehot-r unn er manifo lda ndthe sprue  bus hings. Thi s m aycause  th e  bush ingt obef orced  int o  the bott o msur f a ce  (under sid e ) ofthe h ot- r unnermani fold and cause su r face damage (e rosi o n ) o n t h e se al ing surface.
C ons eq u e ntly, it  i s an object  of thepr e sentinvent ion to  provid e ac lampin g me cha nism forhot -r u nner ma ni fo l d syst emswh ich is  an im p rove m e nt over known fa steni n g  mech a nis ms. I tis anot h er o bject of t he presentinvent ionto pr ovide a  c lampin g m ec hanism for hot-runne r man ifold s ys tems  wh ich pe rmit s therm al e xp ans ion of th e ma n if ol d s w itho ut ad ve rseeffects o n  the cla mpi n g screw sand / o r thes pr u e  bushings.  1.  Fiel d of Inventi o n
Th i si nvent ion re latesto a bu m pin gprocess . M o r e particu larly, th e  pr es entinventio nis r el ate dto a bumping pr ocess fo r ensuri n g  the r eli a bili t y of b um ps and
 a_plurality of_individual sprue bushings positioned_in mold_plates_of the_injection-molding_system. The manifolds_keep the plastic_material in a fluid_condition while the_material_flows from the injection machine nozzle through the sprue bushings and into the mold_cavity._Hot-runner manifold_systems_provide_for use of a plurality_of sprue bushings and multi-cavity_molds and_thus allow increased manufacture of more products.
The sprue_bushings_are inserted into_recesses or bores in the mold plate. The top_or inlet ends of the sprue_bushings are positioned_and_sealed_against the lower surface_of the hot-runner manifold block. (The_lower surface is also called the_"underside" of the manifold block. In addition,_the "top side" of the hot-runner_manifold means the external side_of the_hot-runner manifold block, which lies_opposite the lower_surface and_the sprue bushings.)
Known_hot-runner manifolds commonly contain pairs of_lugs which protrude_on opposite sides of the block_and_which accommodate clamping_screws._In_order to_produce such hot-runner_manifold_blocks, the_external_contours, including the externally protruding lugs,_are_machined from a larger block of metal_material. This requires considerable_expenditure_of labor and waste_of material.
Since the hot-runner manifolds_are heated, they undergo thermal expansion_when in_operation, while_the sprue bushings inserted into the injection-molding mold plate typically maintain_their position. Such thermal expansion, depending_on the dimensions of_the hot-runner_manifold_block, may be_relatively_large, for_example on the order of 3 mm._This causes_twisting and distortion of the clamping_screws inserted in the_lateral_lugs. Furthermore, the thermal expansion causes_an increase in the surface pressure_between the hot-runner manifold and_the_sprue_bushings. This may cause the_bushing to be forced into the_bottom surface (under_side) of the hot-runner manifold and cause_surface_damage (erosion) on the sealing surface.
Consequently,_it_is an object of the present_invention_to_provide a clamping mechanism for_hot-runner manifold systems which is an_improvement over known fastening mechanisms. It is another object_of the present_invention to provide a clamping_mechanism_for_hot-runner manifold systems which permits thermal expansion of the manifolds_without adverse_effects on the_clamping screws and/or the sprue bushings. 1. Field of Invention
This_invention relates to a bumping process. More_particularly, the present invention is related to a bumping process for_ensuring the reliability of bumps and