Shanghai Daoqin Plastics Co., Ltd.

injection molding parts upper separation outer and inner 螺纹两 types, degree high outer generally use block molding, using/adopting toward machine 构. parts inner 螺纹则由螺纹 type molding, its demolding system can according to products production amount, 螺纹牙 type, mold manufacturing process and other factors, usually using/adopting strong/high launch and 自动脱螺纹 machine types 形式.

　　 inner strong/high demolding conditions must meet/satisfy below/following 三点: (1) soft 胶: 如PVC, PP and PE and other and other;(2)牙 type is type, can is 矩形, or 三角形;(3)牙 type high degree must meet/satisfy 公式: elongation =(螺纹 large 径-螺纹 small 径)/螺纹 small 径≤A. its in A value 取决于 plastics product types: ABS is 8%, POM is 5%, PA is 9%, LDPE is 21%, HDPE is 6%, PP is 5%.

　　自动脱螺纹 machine is through type 芯转动而 make parts demolding, its combined various type, production efficiency high, easy achieve 自动化 production by use. 自动脱螺纹 machine 构 动 force 源包括 liquid pressure, and injection molding machine mold opening force amount. in mold is through liquid pressure 推动齿 strip/profile achieve type 芯旋转脱离塑 parts 实例.

　　 injection molding mold toward usually using/adopting “ slip block +斜导柱” and “ slip block +T形 block ”(mold increase separation type achieve 抽芯)两 types structure, introduction types using/adopting liquid pressure 油缸斜抽芯 structure, it 适宜于 large, in type mold.

　　2 塑 parts analysis

　　塑 parts belongs to type parts, 见图1. material: ABS, shrinkage rate 5/1000. parts complex is inner 孔, 一 斜孔, coarse 牙螺纹孔, and 四 侧孔. parts demolding is mold design focus/key point and difficulty/challenge.

　　3 mold structure design

　　客户 requirements 一模出八 parts, using/adopting gate system, outer 形由两 block slip block molding, through slip block between type 腔. runner material material block 34 launch. parts due to 抽芯距离 relatively long, force relatively large and 倾斜角 degree is 45°, if using/adopting “ slip block +斜导柱” and “ slip block +T形 block ”两 types structure, relatively large, easy generate fault/failure, mold design using/adopting liquid pressure 油缸斜抽芯 machine 构, structure simple, as can 靠. demolding using/adopting 自动脱螺纹 machine 构, machine 构设置 in internal, force is liquid pressure. parts most rear 由推杆 launch. mold structure 图见图2.

1.定模面 sheet/plate   2.导 toward solid sheet/plate   3.撑 sheet/plate   4.定模 sheet/plate   5.斜导柱 pressure sheet/plate   6.螺纹 type sleeve/set   7.螺纹 type 芯  8.导 toward 螺母  9. anti 松螺母  10.齿 strip/profile toward block   11.齿 strip/profile   12.油缸 solid 定架  13. liquid pressure 油缸  14.联接螺钉  15.动模 sheet/plate   17. cooling water water 喉  18.斜抽芯  19. liquid pressure 油缸  20.方 iron   21.底 sheet/plate   22.撑柱  23.推杆底 sheet/plate   24.推杆 solid sheet/plate   25. elastic 簧导杆 26.推杆  27. elastic 簧  28.托 sheet/plate   29.动模 type 芯  30. wear resistant block   31. pressure block   32.导柱  33.导 sleeve/set   34. runner material block   35.推杆 36. elastic 簧  37.限位钉  38.锲紧 block   39.斜导柱  40.哈夫 slip block   41.定位销  42. elastic 簧  43.推杆 sheet/plate 导柱  44.推杆 sheet/plate sleeve/set   45.复位杆  46.定位 ring   47. gate sleeve/set pressure block   48. gate sleeve/set   49. gears   50. gears 轴  51.键

　　3.1 浇注 system

　　本塑 parts outer using/adopting 两 哈夫 block molding, has 自动脱螺纹 machine 构, system can using/adopting gate, separation runner separation in 两哈夫 slip block separation type between, 另一部 separation in slip block and sheet/plate 接触面 upper. due to relatively thick, control runner long degree is system design focus/key point, mold design will gate sleeve/set assembly in sheet/plate upper, make runner long degree to most short.

　　3.2 molding parts

　　 mold molding parts 包括定模螺纹 type 芯, slip block, 斜抽芯动模 type and 推杆, in mold as process in, remove type versus for solid 定不动 outer, other molding parts need as versus 应 运动. its in 定模螺纹 type gears belt/tape 动, as 回转运动, also as toward 运动动. 动模斜抽芯则由 liquid pressure 油缸拉动 as toward 运动, 推杆既 is molding parts also is launch parts.

　　哈夫 slip block belongs to toward machine 构, mold opening it 由斜导柱拨开, clamping 时由锲紧 block 锁紧, parts is and elastic 簧.

　　3.3 定模自动脱螺纹 machine 构

　　本 mold 自动脱螺纹 machine 构设置 in inner, liquid pressure 油缸推动齿 strip/profile, strip/profile gears, through gears belt/tape 动螺纹 type 芯转动, type 芯一边转动一边 rear 退脱离塑 parts. gears 传动各 parameters design lower.

　　模数: 模数 确定 must according to standards GB1357-87, strip/profile dimensions, gears dimensions, parts 螺纹圈数 and other factors 确定. according to experience, injection molding mold 自动脱螺纹 machine in gears 传动 模数 usually 取1.5 or 2, 本模m取1.5.

　　传动 ratio: in gears 齿数时, must 先考虑传动 ratio. ratio and selection types methods has 关系, selection electrical machine as is force 源时, 因传动无限 made, ratio small 一点, this can make structure 紧凑, 节省空间, also has reduce 马达瞬间启动 force, also can decrease slow type 芯旋转 speed degree, generally 取0.25≤i≤1;当 use strip/profile +锥 degree or 福线螺母驱动时, 因传动受行程限 made, ratio must large 一点, generally 取1≤i≤4. is decrease small 油缸推动齿 strip/profile 行程, decrease small long degree, ratio is 4.

　　齿数: 模数确定 rear, gears 齿数则由 gears separation degree 圆直径决定. gears separation degree 圆直径 also 取决于排位时确定 gears between in and ratio.

　　 according to mold toward machine large small, 确定主动轮 and by between in is 88.6mm.

　　 generally 说, in 心距一定时, 齿数越 more, 传动越平稳, 噪音越 low. 但齿数 more, 模数就 small, thick small, make its flexural strength reduce, therefore in meet/satisfy gears flexural strength conditions lower, amount relatively more and relatively small 模数. is dry 涉, generally 取Z≥17, type 芯 齿数尽 can can less, most less less 于14齿. above 理由, according to 公式: d=mz, 确定各传动 gears 齿数如 lower (图3).

　　齿 strip/profile 11推动 gears 50齿数: z1=25;

　　 large gears 49齿数: z2=96;

　　螺纹 type upper gears 齿数: z3=23(传动 ratio =96÷23=4.17).

　　4 mold as process

　　(1)熔胶 through gate sleeve/set 48 in runner 进入横 toward separation runner, again through 两哈夫 block separation type in 间 纵 toward separation runner and gate type 腔. in type in filling cooling solid to has rigid property rear, liquid pressure 油缸13开关打开, liquid pressure 推动齿 strip/profile 11, strip/profile 11推动 gears 50, gears 50 through 键51 belt/tape large gears 49转动, again through gears between combined, belt/tape 动螺纹 type 芯7转动, type 芯一边转动一边 in toward 螺母8 导引 lower rear 退, 脱离塑 parts.

　　(2) liquid pressure 油缸19拉动斜抽芯18脱离塑 parts, achieve parts toward 抽芯.

　　(3) injection molding machine 拉动动模 mold opening, mold 定模A sheet/plate 14 and 动模B sheet/plate 15 separation 开. in mold opening process in, block 34推动 runner material, achieve runner material and parts separation 离. meanwhile, 斜导柱39拨动 slip block 40, achieve toward 抽芯. formed mold opening rear, injection molding machine through K.O.孔推动推杆 sheet/plate 23, 进而推动推杆26 will parts 推离动模 type 芯29. mold formed one-time injection molding.

　　(4) clamping 时, liquid pressure 油缸13推动螺纹 type 芯复位, liquid pressure 油缸19推动斜抽芯18复位, block 38推动哈夫 slip block 40复位并锁紧. and solid sheet/plate 由复位 elastic 簧27 and 复位杆45复位.

　　5 precautions

　　(1) in mold opening front, must control time, let type and 斜抽芯完 full 脱离塑 parts. is time, 定模油缸 and 动模油缸 can meanwhile 开启.

　　(2) in gears 齿数时, versus combined gears its 齿数应 is 质数关系, 以避免因 frequency 繁接触, scratch, 撞击而导致 失效集 in in several gears upper.

　　(3) is improve/increase mold production rate, anti 止因摩 scratch hot 而发生 fault/failure, 斜抽芯, slip block and 推杆都必 must design cooling water 孔.

　　(4)斜抽芯18 in injection molding production must has block 锁紧, can 靠油缸 liquid pressure.

　　6 结束语

　　 mold using/adopting “油缸+齿 strip/profile ”定模自动脱螺纹 machine 构, using/adopting liquid pressure toward 抽芯, structure although relatively is complex, production 实践证明 this type of structure is formed 功. mold 自放产以 动 as stability can 靠, products demolding safety 顺利, parts quality combined design requirements.