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塑料模具材料開裂分析及解決對策

1

基本數(shù)據(jù)

2

調(diào)查結(jié)果

2.1.可見一處開裂，開裂部附件的成型面可見因漏水而形成的褐色銹跡；

2.2.通過金相分析材料無異常，熱處理硬度在最高限度范圍內(nèi)；

2.3.冷卻水孔的地方可見應(yīng)力腐蝕開裂。

3

原因分析

3.1在成型豎立面可見橫裂紋，是以背后冷卻水孔A的應(yīng)力腐蝕開裂部為起點(diǎn)，延伸到成型面；

3.2成型面的豎立面到背后冷卻水孔A的壁厚約4MM較薄，對模具的剛性差。

4

分析圖片

成型面?zhèn)龋☉?yīng)力腐蝕開裂）

5

解決對策

5.1加厚冷卻水孔A部的壁厚，對于冷卻水孔直徑D的目標(biāo)，能否將其壁厚改為1～1.5D左右；

5.2變更回火條件，對于耐應(yīng)力腐蝕，中溫回火（350～400℃）比現(xiàn)在施行的高溫回火（500℃）更有利。

ABS注塑件怎么才能增加光亮度

在注塑生產(chǎn)中，塑件光澤不良的主要是：模具、注塑工藝、原料這三方面的原因。以下就此問題作如下簡述，歡迎指正評論!

一、注塑模具

1.模具型腔加工不良

如模具型腔有傷痕、微孔、磨損、粗糙等不足，勢必會(huì)反應(yīng)到塑件上，使塑件光澤不良，對此，要精心加工模具，使型腔表面有較小的粗糙度，必要時(shí)可拋光鍍鉻。2.型腔表面污漬

如型腔表面有油污、水漬，或脫模劑使太多，會(huì)使塑件表面發(fā)暗、沒有光澤，對此，要及時(shí)清除油污和水漬，并限量使用脫模劑。

3.塑件脫模斜度太小

脫模斜度太小會(huì)造成脫模困難，或脫模時(shí)受力過大，使塑件表面光澤*佳，對此，要加大脫模斜度。

4.模具排氣不良

若排氣不良會(huì)造成過多氣體停留在模型內(nèi)，也會(huì)導(dǎo)致光澤不良，對此，要檢查和修正模具排氣系統(tǒng)。

5.澆口或流道設(shè)計(jì)不當(dāng)

澆口或流道截面積過小或突然變化，熔體在其中流動(dòng)時(shí)受剪力作用太大，呈湍流動(dòng)態(tài)流動(dòng)，導(dǎo)致光澤不良，對此，應(yīng)適當(dāng)加大澆口和流道截面積。

二、注塑工藝

1.注射速度過小

注射速度過小造成塑件表面不密實(shí)，顯現(xiàn)光澤不良，對此，可適當(dāng)提高注射速度。2.塑件冷卻不充分

如對于厚壁塑件冷卻不充分，其表面會(huì)發(fā)毛，光澤偏暗，對此，應(yīng)改善冷卻系統(tǒng)。

3.保壓操作不當(dāng)

如保壓壓力過小、保壓時(shí)間太短，使塑件密度不夠而光澤不良，對此，應(yīng)增大保壓壓力和保壓時(shí)間。

4.若熔體溫度過低

當(dāng)熔體流動(dòng)過低時(shí)，使得流動(dòng)性較差，易導(dǎo)致光澤不良，對此，應(yīng)適當(dāng)提高熔體溫度。

5.結(jié)晶樹脂冷卻不均勻

如PE、PP、POM等制作的塑件，如冷卻不均勻會(huì)導(dǎo)致光澤不良，對此，應(yīng)改善冷卻系統(tǒng)，使之均勻冷卻。

6.注射速度與澆口面積不匹配

如注塑速度過大，而澆口截面積又過小，則澆口附近會(huì)發(fā)暗而光澤不良，對此，可適當(dāng)降低注射速度和增大澆口截面積。

三、原材料

1.原材料粒度差異較大

粒度差異較大使得難以均勻塑化，而光澤不良，對此，應(yīng)將原材料進(jìn)行篩分處理。

2.原料中二次料太多

如再生料或水口料加入太多，影響熔體的均勻塑化而光澤不良，對此，應(yīng)減少再生料或水口料加入量。

3.原料耐溫性不良

有些原材料在調(diào)溫時(shí)會(huì)分解變色導(dǎo)致光澤不良，對此，應(yīng)選用耐溫性較好的原材料。

4.原材料中含有易揮發(fā)物

如原料中水分或易揮發(fā)物含量過高，受熱時(shí)揮發(fā)成氣體，在型腔和熔體中凝縮，導(dǎo)致塑件光澤不良，對此，應(yīng)對原材料進(jìn)行預(yù)干燥處理。

5.添加劑的分散性不好

有些添加劑的分散性太差而使塑件光澤不良，對此，應(yīng)改用流動(dòng)性能較好的添加劑。

6.原材料不純

如原料中混有異物，雜料或不相溶的物料，它們不能與其原料均勻混熔在一起而導(dǎo)致光澤不良，對此，應(yīng)事先嚴(yán)格排除這些雜料。

7.潤滑劑用量過少

如潤滑劑用量太少，熔體的流動(dòng)性較差，塑件表面不致密，使得光澤不良，對此，應(yīng)適當(dāng)增加潤滑劑的用量。

所以，也要根據(jù)你的模具拋光度是否達(dá)到要求，如果模具本身沒有問題的話，要確定你的ABS的特性來確定，可以選擇高模溫，高速高壓;用冷凍水也能達(dá)到光潔度

PA6 (polyamide # nylon 6)/GF10 / USA Infinity
Purpose: other
Feature note: glass fiber increased by 10%. Properties and features: good dimensional stability, high rigidity, high strength, good impact resistance, good resistance to creep, good heat resistance and aging properties, fatigue resistance, moderate heat resistance.
Important parameters: the density: 1.2 g/cm3 bibulous rate: 1.4% molding shrinkage rate: 0.6% notched impact strength: 43 tensile strength: 100 MPa bending strength: 141 MPa bending modulus: 4140 MPa thermal deformation temperature: 191 ℃
Manufacturer: Infinity polymer, USA
PA6 (polyamide # nylon 6)/GF30 / USA Infinity
Purpose: other
Feature note: fiberglass increases by 30%. Properties and features: good dimensional stability, high rigidity, high strength, good impact resistance, good resistance to creep, good heat resistance and aging properties, fatigue resistance, moderate heat resistance.
Important parameters: the density: 1.37 g/cm3 bibulous rate: 1.1% molding shrinkage rate: 0.3%, the tensile strength: 248 MPa bending strength: 248 MPa bending modulus: 8270 MPa thermal deformation temperature: 210 ℃
Manufacturer: Infinity polymer, USA
PA6 (polyamide # nylon 6)/SI00VI02BEHX/Triesa
USES: electronic electrical components
Characteristics: good lubrication, good processability, good thermal stability, good stripping performance, no halogen, high viscosity, flame retardant property
Important parameters: the density: 1.14 g/cm3 bibulous rate: 1.5% molding shrinkage rate: 2.5% notched impact strength, tensile strength: 85 MPa elongation at break: 10% hardness: 79 vicat softening point: 200 ℃ heat distortion temperature: 70 ℃
Manufacturer: Triesa, Spain
PA6 (polyamide # nylon 6)/SI20VI01AHQ03 / Spanish Triesa
Purpose: other
Properties note: glass fiber reinforced material 20% packing press weight, dimensional stability good, good surface finish, thermal stability
Important parameters: the melt flow rate, density of 7 g / 10 min: 1.29 g/cm3 bibulous rate: 0.2% notched impact strength: 3.5 tensile strength: 113 MPa elongation at break: 3% hardness: 80 vicat softening point: 235 ℃ heat distortion temperature: 180 ℃ filler content: 25%
Manufacturer: Triesa, Spain
PA6 (polyamide # nylon 6)/PA B3 G15 HL TZ PRTA010 NT333 / Brazil Petropol
Purpose: other
Properties note: glass fiber reinforced material 15% packing press weight, good impact resistance, good electrical performance
Important parameters: the density: 1.2 g/cm3 bibulous rate: 1.1% molding shrinkage rate: 0.6% notched impact strength, tensile strength: 111 MPa elongation at break: 3% bending modulus: 5450 MPa thermal deformation temperature: 200 ℃
Manufacturer: Petropol polymer, Brazil
PA6 (polyamide # nylon 6)/AFX 218 V50 BLACK 31N/France rodia
Purpose: automobile parts
The characteristics note: rigid, high machinability, good and good surface smoothness and high thermal stability
Important parameters: the density: 1.57 g/cm3 bibulous rate: 0.6% molding shrinkage rate: 0.42% notched impact strength: 15 bending strength: 380 MPa bending modulus: 15000 MPa thermal deformation temperature: 256 ℃
Manufacturer: rodia, France
PA6 (polyamide # nylon 6) / 01b20-mf/hangzhou nanmu
Purpose: other
Characteristics note: 01b20-mf is the Polyamide6 series of minerals strengthening 20% resistance to impact, low warp products, excellent mechanical properties of the product and outstanding forming.
Important parameters: the density: 1.25 g/cm3 bibulous rate: 1.1% molding shrinkage rate: 0.5%, the tensile strength: 69.8 MPa elongation at break: 2.7% bending strength, bending modulus of the 110.4 MPa, 4123 MPa hardness: 117 thermal deformation temperature: 110 ℃
Manufacturer: hangzhou nanmu chemical co. LTD
PA6 (polyamide # nylon 6)/b21l-pnt/Shanghai day crystal
Purpose: other
Feature remark: high speed production, quick release, good surface; Used for fabric fiber and soft insert and covering parts, which can make super complicated structure of 0.3 mm.
Important parameters: the density: 1.13 g/cm3 bibulous rate: 7.8% molding shrinkage rate: 0.7% notched impact strength, tensile strength: 70 MPa elongation at break: 10% bending strength: 117 MPa bending modulus: 2590 MPa thermal deformation temperature: 61 ℃
Manufacturer: Shanghai suncrystal engineering plastic technology co. LTD
PA6 (polyamide # nylon 6)/B 240 NG4 Y2 / Italian Taroplas
Purpose: other
Feature note: glass fiber increases by 20%. Features: good fluidity, no halogen, medium and low viscosity, flame retardancy.
Important parameters: the density: 1.34 g/cm3 bibulous rate: 1.5% molding shrinkage rate: 0.45% notched impact strength: oxygen index 2.7:25% tensile strength: 75 MPa elongation at break: 3.5% bending strength: 120 MPa bending modulus: 5500 MPa vicat softening point: 210 ℃ heat distortion temperature: 202 ℃
Manufacturer: Italian Taroplast thermoplastic engineering plastics co. LTD
PA6 (polyamide # nylon 6)/B 280 G3 / Italian Taroplas
Purpose: other
Feature note: fiberglass increases by 15%. Performance characteristics: good anti-uv performance, thermal stability, good stripping performance.
Important parameters: the melt flow rate: 15 g / 10 min density: 1.19 g/cm3 bibulous rate: 1.1% molding shrinkage rate: 0.4% notched impact strength: 5 oxygen index: 24% tensile strength: 125 MPa elongation at break: 4% bending strength: 150 MPa bending modulus: 5800 MPa hardness: 118 vicat softening point: 210 ℃ heat distortion temperature: 190 ℃
Manufacturer: Italian Taroplast thermoplastic engineering plastics co. LTD




PA6 (polyamide # nylon 6)/B 280 G4 x 0 / Italian Taroplas
Purpose: other
Feature note: glass fiber increases by 20%. Characteristics: good fluidity, thermal stability, good stripping performance, flame retardant performance.
Important parameters: the density: 1.4 g/cm3 bibulous rate: 1.5% molding shrinkage rate: 0.3% notched impact strength: oxygen index 5.8:30% tensile strength: 120 MPa elongation at break: 3% bending strength: 150 MPa bending modulus: 6500 MPa vicat softening point: 210 ℃ heat distortion temperature: 190 ℃
Manufacturer: Italian Taroplast thermoplastic engineering plastics co. LTD
PA6 (polyamide # nylon 6)/B 280 G4 / Italian Taroplas
Purpose: other
Feature note: glass fiber increases by 20%. Performance characteristics: good anti-uv performance, thermal stability, good stripping performance.
Important parameters: the melt flow rate: 14 g / 10 min density: 1.24 g/cm3 bibulous rate: 1.1% molding shrinkage rate: 0.4% notched impact strength: oxygen index 6.2:24% tensile strength: 135 MPa elongation at break: 4% bending strength: 170 MPa bending modulus: 6000 MPa vicat softening point: 216 ℃ heat distortion temperature: 190 ℃
Manufacturer: Italian Taroplast thermoplastic engineering plastics co. LTD
PA6 (polyamide # nylon 6)/B3 GF 50 9 RM - M natural (3698)/German akro-plastic
Purpose: other electronic electrical components, automobile parts
Important parameters: the density: 1.61 g/cm3 molding shrinkage rate: 0.4% notched impact strength: 20 tensile strength: 210 MPa bending strength: 330 MPa bending modulus: 17200 MPa thermal deformation temperature: 210 ℃
Manufacturer: akro-plastic, Germany
PA6 (polyamide # nylon 6)/B3 GF 30 4 RM - M black (3476)/German akro-plastic
USES: electronic electrical parts, automobile parts
Important parameters: the density: 1.41 g/cm3 molding shrinkage rate: 0.25% notched impact strength, tensile strength: 170 MPa bending strength: 250 MPa bending modulus: 9500 MPa hardness: 230 thermal deformation temperature: 200 ℃
Manufacturer: akro-plastic, Germany
PA6 (polyamide # nylon 6)/PA6 - I/rich to plasticize
Purpose: automobile parts
Features note: through the mineral filler of nylon 6 and reinforced fiberglass, improves the heat resistance of nylon 6, mechanical properties and dimensional stability, reduce the molding shrinkage rate, linear expansion coefficient.
Important parameters: the density: 1.25 g/cm3 notched impact strength, tensile strength of 50:85 MPa bending strength: 160 MPa bending modulus: 3800 MPa thermal deformation temperature: 160 ℃
Manufacturer: cixi affluent da plasticization co. LTD
PA6 (polyamide # nylon 6) / 136F6Q32H/Austria SAX
Purpose: other
Features: high impact resistance, improved impact resistance, good processability, low temperature resistance and thermal stability
Important parameters: the density: 1.25 g/cm3 notched impact strength, tensile strength: 21 96 MPa elongation at break: 4% bending strength: 145 MPa bending modulus: 4800 MPa vicat softening point: 187 ℃ heat distortion temperature: 186 ℃
Manufacturer: Austria SAX polymer industrial co. LTD
PA6 (polyamide # nylon 6)/NST60P90HSL/Italian lantiche
Purpose: other
The characteristics are: through plasticity, good melt strength, good flexibility, good chemical resistance, thermal stability, good toughness
Important parameters: the density: 1.06 g/cm3 bibulous rate: 1.5% notched impact strength, tensile strength of 800:48.3 MPa elongation at break: 100% bending strength, bending modulus of the 20.7 MPa, 448 MPa, thermal deformation temperature of 40.6 ℃
Manufacturer: rantich engineering plastics co. LTD
PA6 (polyamide # nylon 6)/GF20 / USA Infinity
Purpose: other
Feature note: glass fiber increases by 20%. Properties and features: good dimensional stability, high rigidity, high strength, good impact resistance, good resistance to creep, good heat resistance and aging properties, fatigue resistance, moderate heat resistance.
Important parameters: the density: 1.27 g/cm3 bibulous rate: 1.3% molding shrinkage rate: 0.4% notched impact strength: 64 tensile strength: 131 MPa bending strength: 193 MPa bending modulus: 6210 MPa thermal deformation temperature: 210 ℃
Manufacturer: Infinity polymer, USA
PA6 (polyamide # nylon 6)/PA - 212 / clariant chemical
Purpose: medical
Features note: performance characteristics: good corrosion resistance, good dimensional stability, high rigidity, high strength, homopolymer, machinability is good, good color, good chemical resistance, good toughness, production fast, low shrinkage, nuclear.
Important parameters: the density: 1.14 g/cm3 bibulous rate: 1.6% molding shrinkage rate: 0.9% notched impact strength, tensile strength: 43 89.6 MPa elongation at break: 15% bending strength: 117 MPa bending modulus: 3100 MPa hardness: 85 thermal deformation temperature: 73.9 ℃
Manufacturer: clariant chemical group
PA6 (polyamide # nylon 6) / 01b15-gfh/hangzhou nanmu
Purpose: other
Note: 01b15-gfh is the product of Polyamide6 product GF15 % strengthening, heat-resistant products, excellent mechanical properties of the product and outstanding forming.
Important parameters: the density: 1.23 g/cm3 bibulous rate: 1.5% molding shrinkage rate: 0.7%, the tensile strength: 124.46 MPa elongation at break: 3.3% bending strength, bending modulus of the 186.2 MPa, 4949 MPa hardness: 121 thermal deformation temperature: 213 ℃
Manufacturer: hangzhou nanmu chemical co. LTD