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注塑产品模具工艺的结构特点介绍

来源:http://www.jnhjgs.cn     发布时间:2020-05-05 17:28:07    点击:

(1) 尺寸的精度
(1) Accuracy of dimensions
塑件的尺寸公差推荐值参考《模具设计与制造手册》的2-17,塑件的精度等级参考表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:建议采用的精度
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
作为一个娃哈哈瓶盖,其精度不必太高,故选用一般精度IT4。塑料制件公差参考教材《塑料成型工艺与模具设计》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
作为娃哈哈瓶盖,外观必须有较好的光泽度,其外观的好与差主要取决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级,塑件的表面粗糙度一般为Ra0.8  之间,本产品取Ra0.8,则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
本产品制件的脱模斜度取推荐值,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
从提供的产品来看壁厚均匀,其值为2mm。
According to the products provided, the wall thickness is uniform, with a value of 2mm.
ABS的注射工艺参数
Injection process parameters of ABS
注射类型    螺杆式
Injection type screw type
螺杆转速(r/min)    30~60
Screw speed (R / min) 30 ~ 60
喷嘴形式    直通式
Nozzle type straight through
温度(℃)    190~200
Temperature (℃) 190 ~ 200
料筒温度    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
模具温度(℃)    50~80
Mold temperature (℃) 50 ~ 80
注射压力(MPa)    70~120
Injection pressure (MPA) 70-120
保压力(MPa)    50~70
Holding pressure (MPA) 50 ~ 70
注射时间(S)    3~5
Injection time (s) 3-5
保压时间(S)    15~30
Pressure holding time (s) 15-30
冷却时间(S)    15~30
Cooling time (s) 15-30
成型周期(S)    40~70
Forming cycle (s) 40-70
(5)、成型零件的强度、刚度计算
(5) . calculation of strength and rigidity of formed parts
注射模在其工作过程需要承受多种外力,如注射压力、保压力、合模力和脱模力等。如果外力过大,注射模及其成型零部件将会产生塑性变形或断裂破坏,或产生较大的弹性弯曲变形,引起成型零部件在它们的对接面或贴合面处出现较大的间隙,由此而发生溢料及飞边现象,从而导致整个模具失效或无法达到技术质量要求。因此,在模具设,成型零部件的强度和刚度计算和校核是必不可少的。
山东模具
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.
一般来说,凹模型腔的侧壁厚度和底部的厚度可以利用强度计算决定,但凸模和型芯通常都是由制品内形或制品上的孔型决定,设只能对它们进行强度校核。
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.
因在设采用的是镶嵌式圆形型腔。因此,计算参考公式如下:
Because in the design of the use of inlaid circular cavity. Therefore, the calculation reference formula is as follows:
侧壁:
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。这三种组分的各自特性,使ABS具有良好的综合力学性能。丙烯腈使ABS有良好的耐化学腐蚀性及表面硬度,丁二烯使ABS坚韧,苯乙烯使它有良好的加工性和染色性能。ABS无毒、无味,呈微黄色,成形的塑料件有较好的光泽。密度为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有极好的抗冲压强度,且在低温下也不迅速下降。有良好的机械强度和一定的耐磨性、耐油性、耐水性、化学稳定性和电气性能。ABS有一定的硬度和尺寸稳定性,易于成型加工。经过调色可配成任何颜色。其缺点是耐热性不高,连续工作温度为70°C左右,热变形温度为93°C左右。耐气候性差,在紫外线作用下变硬变脆。
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广泛用于水表壳、纺织器材、电器零件、文教体育用品、玩具等。
Main uses: ABS is widely used in water case, textile equipment, electrical parts, cultural and educational sports goods, toys, etc.
成型特点:ABS在升温时粘度增高,所以成型压力比较高,塑料上的脱模斜度宜稍大,ABS易吸水,成型加工前应进行干燥处理;易产生熔接痕,模具设应注意尽量减少浇口对流道的阻力;在正常的成型条件下,壁厚、熔料温度及收缩率影响极小。要求塑件精度高时,模具温度可控制在50~60°C,要求塑件光泽和耐用时,应控制在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.
关于山东模具http://www.jnhjgs.cn就先介绍到这里了,相信大家在实际的工作中会用到相关知识,如果您有这方面的需要,欢迎前来选购。
About Shandong mold http://www.jnhjgs.cn 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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