Double-shot injection molding method for sundries box of automobile auxiliary console

Abstract

The invention discloses a double-shot injection molding method for a sundries box of an automobile auxiliary console. The method comprises the following steps: mounting an injection molding die; pre-heating a double-shot injection molding machine; carrying out injection molding on hard rubber after the hard rubber and soft rubber are baked to ensure that the temperature of a material storage barrel of the hard rubber PC / ABS is 180 to 250 DEG C, the temperature of hot runner is 250 to 280 DEG C, and the holding pressure is 60 to 90Mpa, completing hard rubber injection molding and then carrying out soft rubber injection molding; completing the double-shot injection molding on the sundries box of the automobile auxiliary console when the temperature of a material storage barrel of the soft rubber TPU is 130 to 220 DEG C and the holding pressure is 60 to 90Mpa. The double-shot injection molding method has the advantages that the process is simple and is easy to realize. The shrinkage rate of the hard rubber adopts a low value of about 3%, so that plastic rubber expansion coefficients caused by the high temperature of the mould are eliminated, when the soft rubber injection molding for twice is carried out, the mould and a plastic rubber piece have suitable pressure, so that a parting surface of the mould is tightly adhered to the plastic rubber piece, and the damage caused by pressing due to heat expansion of the plastic rubber piece is unlikely happened.

Description

technical field

[0001] The invention belongs to the field of preparation of glove boxes for auxiliary dashboards of automobiles, in particular to a method for two-color injection molding of glove boxes for auxiliary dashboards of automobiles. Background technique

[0002] Car interior mainly refers to the car products used in car interior modification. Car interior is an important part of the car body, such as the glove box of the car sub-dashboard. Existing glove boxes for sub-dashboards of automobiles are produced by injection molding and assembly of soft and hard rubber respectively, but due to the need for subsequent assembly, it is easy to miss the soft rubber cushion during the assembly process, and it is also difficult to install the soft rubber cushion during the transportation and assembly process It is easy for the soft rubber cushion to fall off.

[0003] At present, the two-color injection molding method has been adopted in the design of automotive interiors, wh...

Examples

Embodiment 1

[0016] a. Drying of raw materials

[0017] Dry the hard rubber material PC / ABS at 80°C for 3 hours, and dry the soft rubber material TPU at 80°C for 2 hours; b. Preheat the mold

[0018] Install the injection mold and preheat the two-color injection molding machine to make the mold temperature reach 60°C;

[0019] c. Injection molding

[0020] Hard rubber injection molding is carried out first, the storage cylinder temperature of hard rubber PC / ABS is 180°C, the temperature of hot runner is 250°C, the injection speed of hard rubber is 50L / min, the holding pressure is 60Mpa, and the injection molding time is 12s, and the hard rubber injection molding is completed , after cooling the hard rubber PC / ABS storage cylinder for 10s, replenish the hard rubber raw materials to the filling position before injection molding, the amount of hard rubber replenishment is 70g, and after the mold is cooled for 30s, perform soft rubber injection molding; the temperature of the soft rubber TPU ...

Embodiment 2

[0022] a. Drying of raw materials

[0023] Dry the hard rubber material PC / ABS at 100°C for 3 hours, and dry the soft rubber material TPU at 100°C for 1 hour;

[0024] b. Mold preheating

[0025] Install the injection mold and preheat the two-color injection molding machine to make the mold temperature reach 60°C;

[0026] c. Injection molding

[0027] Hard rubber injection molding is carried out first, the storage cylinder temperature of hard rubber PC / ABS is 250°C, the temperature of hot runner is 280°C, the injection speed of hard rubber is 160L / min, the holding pressure is 90Mpa, and the injection time is 10s, and the hard rubber injection molding is completed , the storage cylinder of hard rubber PC / ABS is cooled for 10s, and then the hard rubber raw material is added to the filling position before injection molding. The amount of hard rubber supplemented is 80g. After the mold is cooled for 30s, soft rubber injection is performed; the temperature of the storage cylinde...

Embodiment 3

[0029] a. Drying of raw materials

[0030] Dry the hard rubber material PC / ABS at 90°C for 3.5 hours, and dry the soft rubber material TPU at 90°C for 1.5 hours; b. Preheat the mold

[0031] Install the injection mold and preheat the two-color injection molding machine to make the mold temperature reach 60°C;

[0032] c. Injection molding

[0033] Hard rubber injection molding is carried out first, the storage cylinder temperature of hard rubber PC / ABS is 240°C, the temperature of hot runner is 270°C, the injection speed of hard rubber is 100L / min, the holding pressure is 80Mpa, and the injection molding time is 11s, and the hard rubber injection molding is completed , after cooling the hard rubber PC / ABS storage cylinder for 10s, replenish the hard rubber raw materials to the filling position before injection molding, the supplementary amount of hard rubber is 75g, and after the mold is cooled for 30s, perform soft rubber injection molding; the temperature of the soft rubber...

technical field

[0001] The invention belongs to the field of preparation of glove boxes for auxiliary dashboards of automobiles, in particular to a method for two-color injection molding of glove boxes for auxiliary dashboards of automobiles. Background technique

[0002] Car interior mainly refers to the car products used in car interior modification. Car interior is an important part of the car body, such as the glove box of the car sub-dashboard. Existing glove boxes for sub-dashboards of automobiles are produced by injection molding and assembly of soft and hard rubber respectively, but due to the need for subsequent assembly, it is easy to miss the soft rubber cushion during the assembly process, and it is also difficult to install the soft rubber cushion during the transportation and assembly process It is easy for the soft rubber cushion to fall off.

[0003] At present, the two-color injection molding method has been adopted in the design of automotive interiors, wh...

Examples

Embodiment 1

[0016] a. Drying of raw materials

[0017] Dry the hard rubber material PC / ABS at 80°C for 3 hours, and dry the soft rubber material TPU at 80°C for 2 hours; b. Preheat the mold

[0018] Install the injection mold and preheat the two-color injection molding machine to make the mold temperature reach 60°C;

[0019] c. Injection molding

[0020] Hard rubber injection molding is carried out first, the storage cylinder temperature of hard rubber PC / ABS is 180°C, the temperature of hot runner is 250°C, the injection speed of hard rubber is 50L / min, the holding pressure is 60Mpa, and the injection molding time is 12s, and the hard rubber injection molding is completed , after cooling the hard rubber PC / ABS storage cylinder for 10s, replenish the hard rubber raw materials to the filling position before injection molding, the amount of hard rubber replenishment is 70g, and after the mold is cooled for 30s, perform soft rubber injection molding; the temperature of the soft rubber TPU ...

Embodiment 2

[0022] a. Drying of raw materials

[0023] Dry the hard rubber material PC / ABS at 100°C for 3 hours, and dry the soft rubber material TPU at 100°C for 1 hour;

[0024] b. Mold preheating

[0025] Install the injection mold and preheat the two-color injection molding machine to make the mold temperature reach 60°C;

[0026] c. Injection molding

[0027] Hard rubber injection molding is carried out first, the storage cylinder temperature of hard rubber PC / ABS is 250°C, the temperature of hot runner is 280°C, the injection speed of hard rubber is 160L / min, the holding pressure is 90Mpa, and the injection time is 10s, and the hard rubber injection molding is completed , the storage cylinder of hard rubber PC / ABS is cooled for 10s, and then the hard rubber raw material is added to the filling position before injection molding. The amount of hard rubber supplemented is 80g. After the mold is cooled for 30s, soft rubber injection is performed; the temperature of the storage cylinde...

Embodiment 3

[0029] a. Drying of raw materials

[0030] Dry the hard rubber material PC / ABS at 90°C for 3.5 hours, and dry the soft rubber material TPU at 90°C for 1.5 hours; b. Preheat the mold

[0031] Install the injection mold and preheat the two-color injection molding machine to make the mold temperature reach 60°C;

[0032] c. Injection molding

[0033] Hard rubber injection molding is carried out first, the storage cylinder temperature of hard rubber PC / ABS is 240°C, the temperature of hot runner is 270°C, the injection speed of hard rubber is 100L / min, the holding pressure is 80Mpa, and the injection molding time is 11s, and the hard rubber injection molding is completed , after cooling the hard rubber PC / ABS storage cylinder for 10s, replenish the hard rubber raw materials to the filling position before injection molding, the supplementary amount of hard rubber is 75g, and after the mold is cooled for 30s, perform soft rubber injection molding; the temperature of the soft rubber...