Bottom shell product of dynamic monitor is shown in Figure 1. Maximum outer dimension of product is 35.77 mm * 13.00 mm * 15.00 mm; average glue thickness of plastic part is 0.80 mm, plastic part material is PC + ABS, shrinkage rate is 1.004, and plastic part weight is 4.30 grams. Technical requirements for plastic parts are that there must be no defects such as peaks, underfilling, flow lines, pores, warping deformation, silver streaks, cold materials, jet lines, etc. and they must comply with ROSH environmental requirements.
Tag: Gate design
It refers to a phenomenon in which gate connecting molded product, main runner, and branch runner is not easily cut off when molding with a point gate. If you use point gates or latent gates, when mold is opened and product is connected, gates of main runner and runner will automatically break. However, if shape or size of gate is not appropriate, gate will not be cut properly and will remain inside mold.
Gas-Assisted Injection Molding (GRIM) is a new type of injection molding process, which has been widely used abroad in recent years, is also used more and more domestically. Principle is to use inert gas with relatively low pressure (nitrogen is commonly used because it is cheap and safe, has function of coolant, pressure is 0.5-300 MPa) to replace part of resin in cavity in traditional molding process to maintain pressure, , so as to achieve purpose of better molding performance of product.
Main thickness of product: 1.5~2.0mm; Product length: 327mm; Product width: 216mm; Product problem: Structural design itself is weak, and warpage value is large.
Bottom frame products of auto parts are shown in Figure 1. Maximum dimensions of product are 147.00 mm * 98.40 mm * 39.09 mm, average thickness of plastic part is 2.00 mm, material of plastic part is ABS, shrinkage rate is 1.005, and weight of plastic part is 24.30 grams. Technical requirements for plastic parts are that there should be no defects such as peaking, underfilling, flow lines, pores, warping deformation, silver streaks, cold material, and spray lines.
POM (also known as Saigang, Trane). It is obtained by polymerization of formaldehyde as raw materials. POM-H (polyoxymethylene homopolymer) and POM-K (polyoxymethylene copolymer) are thermoplastic engineering plastics with high density and high crystallinity. Has good physical, mechanical and chemical properties, especially excellent friction resistance. POM is a crystalline plastic with obvious melting point. Once it reaches melting point, melt viscosity drops rapidly. When temperature exceeds a certain limit or melt is heated for too long, it will cause decomposition. Copper is a catalyst for POM degradation, copper or copper materials should be avoided in parts in contact with POM melt.
PC/ABS, polycarbonate and acrylonitrile-butadiene-styrene copolymers and mixtures, are thermoplastic plastics made of polycarbonate and polyacrylonitrile (ABS) alloys. It combines excellent properties of two materials, formability of ABS material and mechanical properties of PC, impact strength, temperature resistance, and ultraviolet (UV) resistance.
Because of its low price, PVC material has inherent anti-inflammatory properties, is strong and strong, has good chemical resistance, and has a shrinkage rate of 0.2-0.6%. Products are increasingly used in electrical appliances, machinery, construction, daily necessities, toys, and packaging. According to characteristics of PVC material, injection molding process of product is analyzed as follows:
1. High mechanical strength, good toughness, high tensile and compressive strength. Specific tensile strength is higher than that of metal, and specific compressive strength is comparable to that of metal, but its rigidity is not as good as that of metal. Tensile strength is close to yield strength, more than twice as high as ABS. Ability to absorb shock, stress and vibration is strong, impact strength is much higher than that of general plastics, and is better than acetal resin.
【Abstract】Analyzed structural characteristics and molding process of L-shaped inner fixed clamp, expounded design scheme of 1 mold with 8 pieces, design points of fixed and movable mold inserts and main electrodes, introduced working process of mold. In view of symmetrical characteristics of plastic part, structure of cavities arranged in mirror image is used to make … Continue reading Design of Injection Mould for L-shaped Internal Fixed Clamping Foot
Gud Mould 