EN
News & Knowledge
Contact Us
Mobile: +86-19279864570
Email: 40045692@qq.com
QQ: 40045692
Address: Building 5, No. 936 Guoshun Road, Nanqiao Town, Fengxian District, Shanghai
plastics injection molding good phenomenon analysis and countermeasures
Date: 2019-11-18 10:03
Views: 2640
Source: Internet
main/primary for currently molding product generate defect has causes add analysis 判断, in molding machine, mold and raw materials provide factors from has control defect generate, reduce production cost.
inner 容:
1 起疮: （银 color strip/profile 纹）
formed product surface, 以CATE is in 心, has very more white strip/profile 痕, basic upper is raw materials flow direction generate. this type of phenomenon is many defect conditions rear 发生, has need true positive causes very difficult.
1．1 raw materials in if has water separation or other formed separation, separation dry, surface upper generate very more strip/profile.
1．2 raw materials in mixed its it raw materials 时, 也会形 formed 起疮, its 形状呈云母状 or 针点状, easy and its it causes formed separation 别.
1．3 raw materials or material tube/pipe 不清洁时, easy this type of 情况.
1．4 injection shot time long, 初期射入 to inner raw materials temperature degree low, solid 化 结果, make formed separation troubleshooting, especially for temperature degree raw materials, 发常会出现 this type of 状况.
1．5 if mold temperature low, raw materials solid fast easy 发生（1. 4）之状况, make formed separation 不会排出 remove.
1．6 mold gas defect 时, raw materials 进入时 gas easy troubleshooting, generate 起疮, this type of 状况, formed product 顶部往往会烧黑.
1．7 mold upper if water separation, 则充填 raw materials belt/tape hot will its 蒸发, and melt raw materials melt combined, formed 起疮, white 雾状.
1．8 胶道 cold material has cold material or small, injection shot 时, cooling raw materials belt/tape 入模穴 inner, separation speed solid formed thin 层, rigid production mold temperature low 也会开 formed 起疮.
1．9 raw materials in process in, 因模穴面接触部 separation cold formed thin 层, also by rear raw materials melt separation understanding, formed white or 污痕状, more thin housing/shell product.
1．10 充填时, raw materials formed 乱流状 can, make raw materials 流径路线延 long, 并受模穴 inner structure effect/influence generate abrasion scratch add 之充填 speed degree ratio raw materials cooling speed degree fast, GATE位置处于筋骨处 or small easy generate 起疮, formed product thick 急剧化 方也容 easy generate 起疮.
1．11 GATE以 and runner small or deformation, speed degree fast, generate abrasion scratch make temperature degree rise formed raw materials separation understanding.
1．12 raw materials in has recycled material, separation dry, injection shot separation understanding, generate 起疮.
1．13 raw materials in material tube/pipe in time 久, formed separation hot separation understanding.
1．14 back pressure 不足, 卷入空 gas （ pressure shrink ratio 不足）.
起疮: table/sheet 一
|
formed
type
machine
|
can can force 不足.
resin hot separation understanding （ material tube/pipe temperature degree ）
material tube/pipe inner raw materials 停留久, formed separation hot.
injection shot pressure high.
screw 卷入空 gas （ back pressure 不足）.
|
|
模
tool
|
mold inner gas defect.
mold temperature degree low.
胶道 cold material 窝存储 small.
GATE small or deformation.
mold surface has water separation.
模穴 形状 defect （横截面 or thick relatively more relatively 急）.
|
|
原
material
|
raw materials in water separation and formed separation.
raw materials dry 不足.
mixed its it raw materials.
|
2 会胶线
会胶线 is raw materials in combined generate fine small 线, due to full melt combined generate, formed product positive, 反面都 in 同一部位 upper fine 线, if mold temperature degree high, and its 接触 会胶线 ratio 另一方 shallow.
1 improve/increase raw materials temperature degree, increase injection shot speed degree 则会胶线 decrease small.
2 improve/increase mold temperature degree, make raw materials in mold inner flow property increase,则 raw materials combined temperature degree relatively high, make its 会胶线 decrease small.
3 CATE 位置决定会胶线 位置, basic upper 会胶线 位置都进胶 direction 一致.
4 mold in has or its it easy formed separation,则 it in in combined melt combined separation formed 会胶线,
5 受 mold structure effect/influence,完 full remove 会胶线 is can can, therefore machine need in remove 会胶线方面,而 is will 会胶线 generate defect phenomenon control in most small degree, this more is important.
会胶线: table/sheet 二
|
formed
type
machine
|
raw materials temperature degree low, flow property 不足
injection shot pressure low
injection shot speed degree slow
灌嘴 cold material or long
灌嘴处 deformation formed retardant force large (pressure loss 失)
|
|
模
tool
|
mold temperature degree low
mold inner gas defect
GATE defect
GATE runner small
from GATE to 会胶线 generate 位置 距离 long (L/T 关系)
mold temperature degree balanced
|
|
原
material
|
raw materials flow property defect
raw materials solid speed degree fast
raw materials dry 不足
|
3 bubbles
formed product thick internal generate 空隙,不 transparent product can from outer to,必 must will its rear can to.
壁 thick in is cooling most slow 方, therefore speed cooling, fast speed shrinkage surface will raw materials 拉引起 generate 空隙,形 formed bubbles.
1 injection shot pressure can can high, decrease/reduce raw materials shrinkage.
2 molding product upper thick 变化急剧时, separation cooling speed degree different, easy rear bubbles.
3 due to 停滞空 gas causes generate bubbles.
4 GATE small, formed product thick fast.
5 in GATE solid front, must maintain separation pressure.
bubbles: table/sheet 三
|
formed
type
machine
|
raw materials temperature degree high, gas generate machine more
injection shot pressure low
injection shot speed degree fast or slow
holding pressure low
holding pressure time short
holding pressure 转换位置太 fast
raw materials temperature degree low, flow property low
back pressure 不足
cooling time long
|
|
模
tool
|
mold temperature degree low
mold gas defect
GATE, runner small
|
|
raw materials
|
烘 dry 不足
raw materials shrinkage ratio rate large
|
4 warpage:
injection shot 时, mold inner resin to high pressure generate internal force, demolding rear, formed product 两旁出现 deformation bending, thin housing/shell molding product easy generate deformation.
1 molding product also has separation cooling 时, ejection, through for surface add pressure, therefore formed warpage or deformation.
2 molding product cooling speed degree non-uniform 时, cooling slow shrinkage amount add large, thin separation raw materials cooling speed, viscosity improve/increase, warpage.
3 mold cooling water 路位置 separation non-uniform, must more temperature degree or use more mold temperature machine adjustment.
4 mold water 路配置 relatively more mold, most good use mold temperature machine separation control, already to temperature degree.
warpage: table/sheet 四
|
formed
type
machine
|
raw materials temperature degree low, flow property 差
holding pressure high
holding pressure time long
injection shot pressure high
injection shot speed degree slow
cooling time short
|
|
模
tool
|
mold temperature degree low
mold upper has temperature 差
mold cooling non-uniform, separation
demolding defect
|
|
raw materials
|
raw materials flow property 不够
|
5 flow marks:
raw materials in inner flow 时, in formed product surface upper 出现以GATE is in year fine small phenomenon.
1 increase raw materials temperature degree and mold temperature degree, make raw materials easy flow.
2 充填 speed degree slow, in process in temperature degree decline, 而发生 this type of phenomenon.
3 if long, in 灌嘴处 temperature degree decline, therefore, cooling raw materials most injection shot, pressure decline, formed flow marks.
4 cooling small, injection shot 初期, temperature degree low raw materials by 先充填造 formed flow marks.
flow marks: table/sheet 五
|
formed
type
machine
|
raw materials temperature degree low, flow property 不够
injection shot speed degree fast or slow
灌嘴孔径 small or long
injection shot pressure low
holding pressure 不足
holding pressure time short
|
|
模
tool
|
mold temperature degree low
mold cooling 不适当
GATE small or runner small
cold material 窝存储 small
|
|
raw materials
|
raw materials flow property defect
|
6 欠肉
formed product 未充填完整, has separation less can, as is its causes is has below/following 几点:
1 formed product large, machine injection shot amount can can force 不足, need selection can force large machine 台.
2 mold gas 效果不佳, inner gas if has in injection shot troubleshooting, due to 残留空 gas causes make 充填不完整, has generate phenomenon.
3 模穴 inner, raw materials flow long, or has thin 壁 部 separation, in raw materials 充填结束 front cooling solid 化.
4 mold temperature degree low, easy formed 欠肉, is improve/increase mold temperature cooling time long, formed molding cycle time long, therefore, must from and production efficiency related degree 决定适当 mold temperature.
5 熔 melt raw materials temperature degree low or injection shot speed degree slow, raw materials in 未充满模穴之 front solid 化而造 formed short phenomenon.
6 灌嘴孔径 small or long, need improve/increase temperature degree, decrease small its flow retardant force, selection can can short, selection 灌嘴孔径 small or long, not only make its flow abrasion scratch retardant force add large, but also due to retardant force function make speed degree decrease slow, raw materials front solid 化.
7 formed product 模穴数 amount relatively more, amount balanced, need 设整GATE large small control, GATE small retardant force large 往往会欠肉, has hot system, can mono adjustment certain 欠肉模穴 temperature degree control.
8 injection shot pressure low, formed short shot.
欠肉: table/sheet 六
|
formed
type
machine
|
injection shot can force （容 amount, can can force ）不足
raw materials material amount 不足（计 amount 不足）
injection shot pressure low
raw materials temperature degree low, flow property 不足
injection shot speed degree slow
灌嘴 deformation （ temperature degree 孔径） pressure loss 失
holding pressure pressure 转换位置 fast
injection shot time setting short
逆止阀破裂
screw large, injection shot pressure low
灌嘴处溢 material
|
|
模
tool
|
GATE or runner balanced defect （ therefore meanwhile 充填）
mold gas defect
GATE deformation or runner small （ pressure loss 失）
mold temperature degree low （ raw materials temperature degree decline to melting point below/following ）
模穴壁 thick thin （ and L/T 关系）
GATE 位置不适当
mold cooling 不适当
|
|
raw materials
|
raw materials flow property 不足
|
7 flash/burrs
formed product more 余 plastics raw materials phenomenon, more in mold clamping 处, 顶针处, slip block and other active 动处.
1 slip block and block if abrasion loss, easy flash/burrs.
2 mold surface 附著异 material 时, 也会出现 flash/burrs.
3 clamping force 不足, injection shot mold by 打开, flash/burrs.
4 raw materials temperature degree and mold temperature degree high, viscosity decline, therefore in mold has upper easy generate flash/burrs.
5 material amount to more, raw materials more injection shot generate flash/burrs.
flash/burrs table/sheet 七
|
formed
type
machine
|
计 amount more (separation 充填)
injection shot pressure high
injection shot speed degree fast
raw materials temperature degree high
clamping force low
injection shot time long
holding pressure pressure high
holding pressure pressure 转换位置 slow
计 amount 不准确, has 误差(back pressure, screw speed)
machine solid, sheet/plate can sheet/plate defect
|
|
模
tool
|
clamping 面接触 defect
mold 接触面 upper has material
模穴 inner has 碰伤
mold temperature degree high
mold rigid property defect （ strong/high degree 不足）
sliding 部位间隙配 combined defect
mold structure design
|
|
原
material
|
raw materials flow property good
|
8． sink marks
due to shrinkage, thick surface raw materials by 拉入, 因化时, in formed product surface 出现凹陷痕迹. sink marks is formed product surface defect phenomenon in most more, large more 发生于壁 thick 处, generally if pressure decline shrinkage machine rate relatively large.
1． mold design 时, need remove necessary thick degree, generally must can can make molding product thick uniform;
2． if molding temperature degree high, thick 处, 筋骨处 or 凸起处反面容 easy sink marks, this is is easy cooling solid 化, difficult cooling separation raw materials that 移动, amount will sink marks control in effect/influence formed product quality 方.
3． generally reduce molding temperature degree, mold temperature degree decrease/reduce raw materials shrinkage, 但势必 increase pressure.
sink marks table/sheet 八
|
formed
type
machine
|
injection shot time short （GATE未 solid 化时, holding pressure 就会结束）
holding pressure low
计 amount 不足
holding pressure 位置转换太 fast
injection shot pressure low
injection shot speed degree slow
cooling time short
raw materials temperature degree high
逆止阀破 loss
灌嘴孔径 deformation （ pressure loss 失） or material
|
|
mold
|
mold temperature degree high
mold cooling non-uniform （ mold separation high ）
GATE small
mold structure design
顶针不适当
|
|
raw materials
|
raw materials shrinkage rate large
|
9．不 easy demolding （顶凸）
mold 打开时 formed product in demolding, ejection 时, or formed product. if mold defect, viscous 于静模.
1． mold gas defect or gas 槽（排 gas 槽位置不 for or deep degree 不够）造 formed demolding 不顺利;
2． injection shot pressure high, deformation large, shrinkage non-uniform, for demolding;
3． adjustment mold temperature degree, for anti demolding has 效, make molding product cooling shrinkage rear, 以便于 demolding, is, if shrinkage degree, in upper easy demolding, therefore, must maintain most mold temperature. generally, mold temperature ratio mold temperature high 出5℃—10℃ left right, 视实际状况而定.
4． 灌嘴 and in if for 不准, 孔偏移 or 灌嘴孔径 large 于胶道孔径, 均会造 formed demolding 不顺.
demolding table/sheet 九
|
molding machine
|
raw materials temperature degree high
injection shot pressure high
injection shot time long
holding pressure time long
cooling time short
holding pressure high
|
|
mold
|
mold demolding 角不够
mold temperature degree high
mold gas defect
mold cooling non-uniform
灌嘴孔径 large 于胶口孔径
灌嘴偏移
|
|
raw materials
|
raw materials flow property 不足
raw materials shrinkage rate small
|
