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8 Intro Molding

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mold design
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  1 1 Design and manufacturing of plastic injection mould 08–Runner system Dr. Mikó Balázs miko.balazs@bgk.bmf.huBAGIM1ENNB 2 Content  Identification of injection location  Cold sprue  Runner system  Type of gates  Hot drop  Hot runner 3 Aim of injection system  Drive the melted plastic to the cavities  Parts  Sprue  Runners  Gate 4 Type of injection system  Cold injection system  Hot injection system (heated)  Combinatedsystem 5 Identify the gate location  Equal filling up of the cavities  Minimal welding line  Minimal distance  Parting line geometry  Esthetic viewpoint 6 Computer aided analysis Best gate location  2 7 Filltime   8 Injection pressure   9 Melt front temperature   10 Quality prediction   11 Welding line   12 Air bubble/ trap  3 13 Spruebushing R 0 / 15,5 / 400,5°/ 1°R0,5 / R2 14 Spruebushing 15 Role of radii    R s > R m 16 Catalogue components With radius 0 / 15.5 / 40Angle 0.5°/ 1°Diameter d 2 17 Size of the spruediameter 0,4 mm0,7 mm0,9 mm0,55 mm    1   i  n    3   =   1   6 ,   4  c  m    3 26242460229621321968180416401476131211489848206564923281640 18 Runner system  Shortlength  Balancing  Optimal cross section  Simple manufacturing  4 19 Balancing  Aim: same fill up time  Naturally balancing: equal runner length  Artificial balancing: adjust runner cross section   20 Natural balancing 21 Artificial balancing AA/2A/2 * 2/3A/2 * 2/3 * 1/2 22 Combinedbalancing 23 Runner cross section   24 Cold slug well Collect the not too good quality material of the melt front.
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