Common problems and countermeasures in injection molding process (2)

Precision As a manufacturer with rich experience in precision metal stamping and metal insert injection molding, we can produce all kinds of roll-to-roll pre-injected parts, and can produce all kinds of precision plastic parts. We can provide two-color injection, three-color injection, and two-color injection molding. Customized injection molding services such as sub-injection molding. Next, our team will analyze the common problems and countermeasures in the injection molding process for you (2) 1. The cause and solution of the product oval. The ellipse of the product is due to the unevenness of the glue, resulting in uneven pressure around the product, so that the product is elliptical, and the three-point glue is used to make the product evenly enter the glue. 2. The requirements of precision products on molds. The mold material is required to have good rigidity, small elastic deformation, and small thermal expansion coefficient. 3. The rationality and selection method of mold exhaust point. The mold vent point is unreasonable, not only can't achieve the venting effect, but will cause product deformation or size changes, so the mold vent point should be reasonable. When selecting the mold exhaust point, the exhaust should be opened in the place where the product is full of glue at the end and the place where the product is trapped and burned. 4. Injection capacity of the injection molding machine: PW u003d injection pressure (kg/cm2) × injection volume (cm3)/1000 5. Injection horsepower of the injection molding machine: PW (KW) u003d injection pressure (kg/cm2) × injection rate ( cm3/sec)×9.8×100% 6. Injection rate of injection molding machine: V(cc/sec)u003dл/4×d2×rd2: Diameter of material tube r: Density of material 7. Injection thrust of injection molding machine: F (Kgf)u003dл/4 (D12-D22)×P×2D1: cylinder inner diameter D2: piston rod outer diameter P: system pressure 8, injection molding machine injection pressure: P (kg/cm2)u003d[л/4×( D12-D22)×P×2]/(л/4×d2) 9. Plasticizing capacity of injection molding machine: W(g/sec)u003d2.5×(d/2.54)2×(h/2.54)×N× S×1000/3600/2h u003d the depth of the screw front end (cm) S u003d the density of the raw material 10, what is the system pressure? What is the difference with injection pressure? System pressure (kg/cm2) u003d the highest working pressure set in the hydraulic circuit. The injection pressure refers to the actual pressure of the injection molding machine, and the two are not equal. [Related recommendation] Learn more: 精の corporate culture Learn more: Continuous improvement and innovation are the key factors for the survival of stamping companies Learn more: Why most stamping factories are unwilling to quote foreign trade companies