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注塑產品模具工藝的結構特點介紹

來源:http://www.bghkca.buzz     發布時間:2020-05-05 17:28:07    點擊:

(1) 尺寸的精度
(1) Accuracy of dimensions
塑件的尺寸公差推薦值參考《模具設計與制造手冊》的2-17,塑件的精度等級參考表2-18。
Refer to 2-17 of the mold design and manufacturing manual for recommended dimensional tolerance of plastic parts, and refer to table 2-18 for accuracy grade of plastic parts.
表二:建議采用的精度
Table II: recommended accuracy
材料    高精度    一般精度    低精度
Material high precision general precision low precision
ABS    3    4    5
ABS    3    4    5
作為一個娃哈哈瓶蓋,其精度不必太高,故選用一般精度IT4。塑料制件公差參考教材《塑料成型工藝與模具設計》表3-8(SJ1372-78)。
As a Wahaha bottle cap, its accuracy does not need to be too high, so the general accuracy it4 is selected. Refer to table 3-8 (sj1372-78) of plastic part tolerance textbook plastic forming process and mold design.
(2) 表面粗糙度
(2) Surface roughness
作為娃哈哈瓶蓋,外觀必須有較好的光澤度,其外觀的好與差主要取決于模具型腔的表面粗糙程度。模具的表面粗糙度要比塑件的要求低1~2級,塑件的表面粗糙度一般為Ra0.8  之間,本產品取Ra0.8,則模具型腔的表面粗糙度Ra0.4。
As a Wahaha bottle cap, its appearance must have a good glossiness, which depends on the surface roughness of the mold cavity. The surface roughness of the mold is 1-2 levels lower than that of the plastic part. The surface roughness of the plastic part is generally between Ra0.8. If Ra0.8 is selected for this product, the surface roughness of the mold cavity is Ra0.4.
(3) 斜度
(3) Slope
本產品制件的脫模斜度取推薦值,型腔:1030,,型芯:40
The demoulding inclination of the product is the recommended value, cavity: 1030, core: 40
(4) 壁厚
(4) Wall thickness
從提供的產品來看壁厚均勻,其值為2mm。
According to the products provided, the wall thickness is uniform, with a value of 2mm.
ABS的注射工藝參數
Injection process parameters of ABS
注射類型    螺桿式
Injection type screw type
螺桿轉速(r/min)    30~60
Screw speed (R / min) 30 ~ 60
噴嘴形式    直通式
Nozzle type straight through
溫度(℃)    190~200
Temperature (℃) 190 ~ 200
料筒溫度    前段 (℃)    200~210
Drum temperature front section (℃) 200 ~ 210
中段  (℃)    210~230
Middle section (℃) 210 ~ 230
后段  (℃)    180~200
Back section (℃) 180 ~ 200
模具溫度(℃)    50~80
Mold temperature (℃) 50 ~ 80
注射壓力(MPa)    70~120
Injection pressure (MPA) 70-120
保壓力(MPa)    50~70
Holding pressure (MPA) 50 ~ 70
注射時間(S)    3~5
Injection time (s) 3-5
保壓時間(S)    15~30
Pressure holding time (s) 15-30
冷卻時間(S)    15~30
Cooling time (s) 15-30
成型周期(S)    40~70
Forming cycle (s) 40-70
(5)、成型零件的強度、剛度計算
(5) . calculation of strength and rigidity of formed parts
注射模在其工作過程需要承受多種外力,如注射壓力、保壓力、合模力和脫模力等。如果外力過大,注射模及其成型零部件將會產生塑性變形或斷裂破壞,或產生較大的彈性彎曲變形,引起成型零部件在它們的對接面或貼合面處出現較大的間隙,由此而發生溢料及飛邊現象,從而導致整個模具失效或無法達到技術質量要求。因此,在模具設,成型零部件的強度和剛度計算和校核是必不可少的。
山東模具
During the working process of the injection mold, it needs to bear many kinds of external forces, such as injection pressure, holding pressure, closing force and demoulding force. If the external force is too large, the injection mold and its formed parts will produce plastic deformation or fracture damage, or produce large elastic bending deformation, which will cause the formed parts to have a large gap at their mating surface or mating surface, resulting in overflow and flash phenomenon, which will lead to the failure of the whole mold or fail to meet the technical quality requirements. Therefore, in the mold design, the strength and stiffness calculation and verification of the formed parts are essential.
一般來說,凹模型腔的側壁厚度和底部的厚度可以利用強度計算決定,但凸模和型芯通常都是由制品內形或制品上的孔型決定,設只能對它們進行強度校核。
Generally speaking, the thickness of the side wall and the bottom of the cavity of the concave model can be determined by the strength calculation, but the punch and the core are usually determined by the internal shape of the product or the pass on the product, so the strength can only be checked during the design.
因在設采用的是鑲嵌式圓形型腔。因此,計算參考公式如下:
Because in the design of the use of inlaid circular cavity. Therefore, the calculation reference formula is as follows:
側壁:
Sidewall:
ABS塑料
ABS plastic
基本特性:ABS是由丙烯腈、丁二烯、苯乙烯共聚而成的。這三種組分的各自特性,使ABS具有良好的綜合力學性能。丙烯腈使ABS有良好的耐化學腐蝕性及表面硬度,丁二烯使ABS堅韌,苯乙烯使它有良好的加工性和染色性能。ABS無毒、無味,呈微黃色,成形的塑料件有較好的光澤。密度為1.02~1.05g/cm?。
Basic characteristics: ABS is made of acrylonitrile, butadiene and styrene. The properties of these three components make ABS have good comprehensive mechanical properties. Acrylonitrile makes ABS have good chemical resistance and surface hardness, butadiene makes ABS tough, styrene makes ABS have good processability and dyeing performance. ABS is nontoxic, tasteless and yellowish. The plastic parts formed have good luster. The density is 1.02-1.05g/cm?.
ABS有極好的抗沖壓強度,且在低溫下也不迅速下降。有良好的機械強度和一定的耐磨性、耐油性、耐水性、化學穩定性和電氣性能。ABS有一定的硬度和尺寸穩定性,易于成型加工。經過調色可配成任何顏色。其缺點是耐熱性不高,連續工作溫度為70°C左右,熱變形溫度為93°C左右。耐氣候性差,在紫外線作用下變硬變脆。
ABS has excellent stamping strength and does not decrease rapidly at low temperature. It has good mechanical strength, wear resistance, oil resistance, water resistance, chemical stability and electrical performance. ABS has certain hardness and dimensional stability, and is easy to form and process. It can be matched into any color through color matching. Its disadvantages are low heat resistance, continuous working temperature of about 70 ° C, thermal deformation temperature of about 93 ° C. Poor weather resistance, hardening and embrittlement under the action of ultraviolet.
主要用途:ABS廣泛用于水表殼、紡織器材、電器零件、文教體育用品、玩具等。
Main uses: ABS is widely used in water case, textile equipment, electrical parts, cultural and educational sports goods, toys, etc.
成型特點:ABS在升溫時粘度增高,所以成型壓力比較高,塑料上的脫模斜度宜稍大,ABS易吸水,成型加工前應進行干燥處理;易產生熔接痕,模具設應注意盡量減少澆口對流道的阻力;在正常的成型條件下,壁厚、熔料溫度及收縮率影響極小。要求塑件精度高時,模具溫度可控制在50~60°C,要求塑件光澤和耐用時,應控制在60~80°C。
Molding features: ABS viscosity increases when heating up, so the molding pressure is relatively high, the demoulding slope on the plastic should be slightly larger, ABS is easy to absorb water, and should be dried before molding; weld marks are easy to occur, so attention should be paid to reducing the resistance of the gate to the flow channel during mold design; under normal molding conditions, wall thickness, melt temperature and shrinkage rate have little impact. When the precision of plastic parts is required to be high, the mold temperature can be controlled at 50-60 ° C. when the luster and durability of plastic parts are required, the temperature shall be controlled at 60-80 ° C.
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About Shandong mold http://www.bghkca.buzz introduced here first, I believe you will use the relevant knowledge in the actual work, if you have this need, welcome to purchase.
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