Shanghai Daoqin Plastics Co., Ltd.

         currently, large separation use electrical appliances appearance parts is injection molding to. in injection molding process in, easy 出现熔接痕, gas 痕, deformation and other defect; high light mold can solution upper defect. lower 面我们就一起 看看 high light injection molding mold design large elements.

        一, high light injection molding principle

        1. temperature degree relatively high

         mold molding for temperature degree requirements relatively high (generally is 80℃-130℃ left right), in injection molding holding pressure rear use cooling water, make mold temperature degree drop 至60-70℃. relatively high mold temperature lower holding pressure molding has 利于消 remove weld lines, flow marks, product internal stress and other defect. therefore mold in as 时需进行 add hot 处理, is anti hot amount loss 失, usually in 定模侧 add thermal insulation sheet/plate.

        2. mold cavity surface degree light 亮(generally is 镜面2 grade or more high)

         high light mold production product can used for machine (assembly), 无需做任何 surface treatment. therefore it for mold and plastics material requirements very high.

        3. hot runner system hot relatively more

        每 hot 喷咀必 must belt/tape 封针且 has gas 道, through electrical magnetic and time electrical appliances and other mono control, achieve separation 时进胶, from to control 甚至消 remove 熔接痕 目, control methods complex.

        4. add hot methods

         mold add hot methods usually has water gas (hot water) add hot and electrical hot rod (tube/pipe) add hot types. water gas (hot water) add hot methods is through temperature machine in injection molding process in to mold 输入蒸 gas (hot water), from make mold fast speed rise temperature; in injection molding rear use cold water cooling mold, make mold fast speed drop temperature. electrical add hot methods and water add hot temperature machine, in principle upper is 一样, is hot 源不一样, electrical add hot is can 源, water add hot is can 源, principle electrical add hot can loss consumption less, utilizing rate high, energy saving good. use 方便, therefore 说: if is sheet/plate (面) product also is using/adopting electrical add hot methods 实慧.

图: water add hot

图: add hot rod add hot

        二, mold material

        1. product surface requirements mold material can use: NK80(Japan large 同) and other ;

        2. high light requirements material selection: S136H(瑞典), CEANA1(Japan) and other ;

        3.NK80 can use 淬火处理;S136H应 in coarse processing rear 淬火至52 degree;CEANA1本身 tool 备42 degree need 淬火处理(建议 use 此钢材, effect/influence rear processing or 改动);

        4. Germany 葛利兹 Brand in has selection: CPM40/GEST80

图 high light mold

        三, mold water design

        1. water 道孔径 large small design

         water using/adopting 5-6mm large small 孔径; water use 1/8 or 3/8 牙(mold 侧), 另一侧 use 3/4英 made 螺纹(老式接 method); pipe fittings material use 不锈钢 tube/pipe;现 in 我们改 formed 一进一出, separation most good is in mold inner, using/adopting can use DN25连接, this hot can loss consumption less, as 方便, 接口方便.

        2. product design

         water 道一侧离 product generally selection 5-6mm;选 large for mold rise temperature time has effect/influence, small for mold strong/high degree has effect/influence. water 道平行 product must need uniform 排布(原质 in 心15mm and other distribution) hot electrical design in water in 间, deep degree in 50mm above, most large ultra- 100mm, mold structure active 掌握. sleeve/set mold PT100 is 一配一, maintain it degree, must it to mold type 腔模仁 inner, add solid 定. use 引线连 to mold outer 侧, again to temperature machine base/seat upper.

        3. mold water 道接头 design

         mold water 道接头必 must design in mold upper lower or rear 侧端;操 as 侧(站人一侧)不允许 has water export or water tube/pipe 排布, tube/pipe 子破裂汤伤 production 人员. 切记!

        4. mold water design

         mold water using/adopting separation sheet/plate design, water hot mold temperature machine system has 一进一出接口, decrease/reduce more water tube/pipe 连接, decrease/reduce hot can necessary loss consumption;且达 to ** and energy saving 目. 且波纹 tube/pipe outer table/sheet use thermal insulation tape 缠绕, to temperature and ** function.

        5. mold 施工孔洞

         mold 施工孔洞(不 need 孔洞), need use 堵头堵塞, ensure gas water, methods is use copper 堵, rear again use degree add high temperature resistance 胶密封; high light mold for cooling water 道 排布 comparison 讲究(water hot mold water is use), good water 道排布 not only can large large improve/increase injection molding efficiency, but also in improvement product quality 方面也起 to important function. high light mold water not only need uniform but also must need separation (need has 足够 数 amount).

         this for mold rise temperature very fast; meanwhile, using/adopting add long water tube/pipe will 模芯运 water 引出而不 using/adopting 密封圈, this can anti mold long in high temperature lower as 业, make 密封圈 aging, can reduce many mold repair cost. value is, high light mold water tube/pipe must using/adopting high temperature resistance material (250℃)波纹 tube/pipe.

         high pressure 1.6Mpa tube/pipe, anti high temperature high pressure lower water tube/pipe 爆裂. for/regarding type product using/adopting ring water; for/regarding long strip/profile product using/adopting 平行运 water water 道. for/regarding high degree large product using/adopting water 井形式; for/regarding product using/adopting and product outer type 一至 三维运 water methods.

        四, mold thermal insulation system

        1. mold design

         mold 定模镶芯 or 动模镶芯四面 need to 掏空处理;模 frame and need has 一定 间隙(视 mold material thermal expansion coefficient, mono 面1mm). anti frame 膨胀, decrease/reduce 模芯于模 frame 接触面, to make hot can loss consumption most small 化;模芯 and frame using/adopting 斜契式 or its it similar methods, front using/adopting thermal insulation obvious powder resin or its it material (如石棉 sheet/plate).

        2.模 frame design

        模 frame and detailed structure, frame cooling water non important, is anti 止模仁 in hot can 传至模 frame, need in 靠近导柱位置, upper lower 排布一圈运 water

        3.导 sleeve/set design

        导 sleeve/set 运动部位尽 can can using/adopting 石墨材 material or 者 导柱 front 端避空处理, combined need ensure 25mm long degree 就足够;

        五, mold gate design

         mold gate design need can can decrease/reduce 熔接痕, has 利于排 gas and decrease/reduce 剪切. for using/adopting water add hot temperature machine mold, gate dimensions need large and amount using/adopting large gate 进胶, in effect/influence product machine can and molding efficiency lower, gate amount shrink short its long degree, deep degree, wide degree.

        1. gate small

        若 gate small, easy formed short shot (short 射), shrinkage 凹陷, weld lines and other appearance upper defect, molding shrinkage increase large.

        2. gate large

         gate large, gate generate residual stress, 导致产口 deformation or 破裂, gate remove processing difficult and other.

         most good selection gate, remove non flow ratio ultra- 实际 极限. resin flow long degree 曲线图, will provide in certain 一确定 molding conditions lower material flow long degree. more gate generate weld lines and 熔接痕. remove long, narrow product, using/adopting mono gate will ensure more 一致 材 material, temperature degree, holding pressure distribution, more good combined 效果.

        六, mold gas

        尽 can can in product versus 隔10mm is 一段, uniform distribution gas 槽, deep degree is 0.15mm; product in 间贴面也 need gas design.

        七, mold separation type combined

        因 is high light mold temperature degree high low has very large 落差, therefore 贴面配 combined requirements relatively high, meanwhile need decrease/reduce 贴面 面积, separation type 面四周 has 10mm配 combined 就够.

        八, add hot rod (tube/pipe) high light mold design

        1, in gate upper lower need has electrical hot rod (tube/pipe), cooling water generally is 6mm(can large more good);两 water in 心距离 is 15-20mm; add hot rod product surface is 5mm, add hot rod between in 心距离 is 20mm; cooling water add hot rod 壁距离 is 6-8mm, has conditions most good and electrical hot rod 穿插排布.

        2, inner mold cavity water can use high temperature resistance 密封圈密封 or using/adopting hard methods.

        3, add hot rod is 4.92mm, mold design is 5mm, assembly add hot rod front use 5mm abrasion add hot rod 毛刺 掉.

        4, mold water using/adopting and water add hot mold separation sheet/plate design (cooling water), is electrical hot mold control system has 一进一出 water pipeline.

        九, high light mold for product requirements

         high light mold for product structure requirements very 严格, light product for light 折射效果越敏感, surface has defect very fast by 发现, therefore how to solution sink marks issues is high light product need issues. generally product thick degree ultra- 主体胶位 thick degree 0.6mm倍便不 sink marks, or sink marks relatively small easy by 发现, can 忽略不计. for high light product 而言, this requirements 远远不够, also will product thick degree decrease small to ultra- 主体胶位 thick degree 1倍, for/regarding filament also must 做火山口式斜顶 structure.

        十, high light for plastics material selection

         currently commonly used high light plastics material generally is ABS+PMMA and ABS+PC, PMMA, ASA and other.

         as is commonly used machine housing/shell material, ABS+PC product in resistant impact property, surface gloss degree and hardness 方面都 ratio HIPS good, therefore in production high light product 时, usually selection is high light ABS材 material. if need weather resistant, can can selection ASA, in hardness can can selection PMMA alloy material. lower specific lower ABS材 material.

        1.ABS melt viscosity how to control?

        ABS belongs to 无定形 polymer, obvious melting point . due to its grade product grade more, in injection molding process in product grade different made combined process parameters, generally in 160℃ above, 270℃ below/following can molding. in molding process in, ABS heat stabilized property relatively good, can selection scope/range relatively large, easy degradation or separation understanding. 且ABS melt viscosity in, its flow property ratio polystyrene (PS) (PS), polycarbonate (PC) (PC) and other need good, but also melt cooling solid speed degree comparison fast, generally in 5～15秒 inner can cold solid.

        2.ABS water absorption how to control?

        ABS flow property and injection temperature degree and injection pressure has 关系, its in injection pressure 稍敏感. is 此, in molding process in can from injection pressure 入手, reduce its melt viscosity, improve/increase property can. ABS因组 separation different, water and viscous water property can 各异, its surface viscous water and water absorption in 0.2%～0.5%, has can 达0.3%～0.8% between, is to relatively is products, in molding front as drying 处理, make water amount drop 至0.1% below/following. 否则 made parts surface will 会出现 bubbles, silver streaks and other 瑕疵. usually plastics material need add 1% metal powder improve/increase high light metal 效果.