4.6 The Selection of the Injection Machine
4.6.1 Calculation of the Injection Volume
Figure 4-8 shows the volume of plastic parts by Solidworks modeling.
Figure 4-8 Volume of the Stress Cone
Plastic parts volume: Vplastic = 4.198 × 10-5 m3 = 41.98 cm3
Plastic parts density: ρ = 1.2 g/cm3
Plastic parts quality: mplastic = ρVplastic = 1.2 × 41.98 = 50.376 g
4.6.2 Preliminary Estimation of the Gating System
Although the gating system of condensate cannot determine the exact value prior to design, it can be estimated empirically according to 0.2~ 1 times the plastic part. The flow channel used in this design is simple and short, so gating system of plastic material is 0.3 times the volume of plastic parts to estimate. Therefore, the …show more content…
Table 4-2 Technical Parameters of the Injection Machine
Technical indicators Value Technical indicators Value
Theoretical injection volume(cm3) 350 Spacing of drawbars (mm) 410 × 410
Screw plunger diameter (mm) 45 Mold transfer stroke (mm) 360
Injection pressure (MPa) 193 Maximum mold thickness (mm) 400
Injection time (s) 3.8 Maximum template spacing (mm) 400
Plasticizing capacity (g/s) 80 Mode-locked 410 × 410
Clamping force (kN) 1500 Die positioning hole diameter (mm) ϕ …show more content…
Main purpose of the gating system is to carry the molten material into the cavity. [55] However, to design a gating system for an injection molding, few main principles should be followed. In shrinkage and molded part dimensions maintaining, gate and location are critical. De-gating design ensures that the runner trims off automatically. While designing a gating system, it is necessary to select the suitable location for the gate. Consequently, following principles must be followed.
Gate location should be chosen in parting surface, to facilitate machining and maintenance.
Location of the gate should be able to balance flow in all directions, or to achieve flow along the axis of the most critical dimensions.
Locate the gate on the thick wall to ensure the cavity can be filled completely and material flow s from thick to thinner sections.
Thickness of the gate should not be less than 50–75% of the adjacent wall. In addition, width of the gate should be 2 or 3 times the
4.6.1 Calculation of the Injection Volume
Figure 4-8 shows the volume of plastic parts by Solidworks modeling.
Figure 4-8 Volume of the Stress Cone
Plastic parts volume: Vplastic = 4.198 × 10-5 m3 = 41.98 cm3
Plastic parts density: ρ = 1.2 g/cm3
Plastic parts quality: mplastic = ρVplastic = 1.2 × 41.98 = 50.376 g
4.6.2 Preliminary Estimation of the Gating System
Although the gating system of condensate cannot determine the exact value prior to design, it can be estimated empirically according to 0.2~ 1 times the plastic part. The flow channel used in this design is simple and short, so gating system of plastic material is 0.3 times the volume of plastic parts to estimate. Therefore, the …show more content…
Table 4-2 Technical Parameters of the Injection Machine
Technical indicators Value Technical indicators Value
Theoretical injection volume(cm3) 350 Spacing of drawbars (mm) 410 × 410
Screw plunger diameter (mm) 45 Mold transfer stroke (mm) 360
Injection pressure (MPa) 193 Maximum mold thickness (mm) 400
Injection time (s) 3.8 Maximum template spacing (mm) 400
Plasticizing capacity (g/s) 80 Mode-locked 410 × 410
Clamping force (kN) 1500 Die positioning hole diameter (mm) ϕ …show more content…
Main purpose of the gating system is to carry the molten material into the cavity. [55] However, to design a gating system for an injection molding, few main principles should be followed. In shrinkage and molded part dimensions maintaining, gate and location are critical. De-gating design ensures that the runner trims off automatically. While designing a gating system, it is necessary to select the suitable location for the gate. Consequently, following principles must be followed.
Gate location should be chosen in parting surface, to facilitate machining and maintenance.
Location of the gate should be able to balance flow in all directions, or to achieve flow along the axis of the most critical dimensions.
Locate the gate on the thick wall to ensure the cavity can be filled completely and material flow s from thick to thinner sections.
Thickness of the gate should not be less than 50–75% of the adjacent wall. In addition, width of the gate should be 2 or 3 times the