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Injection molding process of automobile bumper

An injection molding process and a technology for automobile bumpers, which can be used in household components, applications, household appliances, etc., can solve problems such as poor surface quality, insufficient structural strength, and large melting shrinkage, and achieve high firmness and strength, and are not easy to change color and fall off , the effect of improving the pass rate

Inactive Publication Date: 2021-05-28
常州鑫凯车辆部件有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current molding process of plastic bumpers is not very optimized. After molding, the shrinkage rate is large, the surface quality is poor, and the structural strength of the molding is insufficient.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: a kind of injection molding process of automobile bumper, comprises the following steps:

[0015] 1) Mold preparation: Clean the cavity and core surface of the mold with an organic solvent, after cleaning and drying, spray a release agent, and then heat the mold, keeping the temperature at 210-230°C;

[0016] 2) Injection molding: Ratio materials: 55-80 parts of high-flow polypropylene resin, 40-80 parts of high-impact resin, 30-35 parts of polystyrene resin, 30-35 parts of polyolefin elastomer, 10-20 parts of carbon fiber parts, 5-25 parts of titanium dioxide fiber, 10-15 parts of grafting, 2-12 parts of vulcanizing agent, 10-25 parts of wear-resistant quartz powder, 1-10 parts of anti-aging agent, 6-18 parts of coupling agent, compatibility 1-10 parts of agent, 4-15 parts of toughening agent, 4-15 parts of stiffening nucleating agent, 4-15 parts of anti-impact agent, 4-8 parts of heat stabilizer, 1-10 parts of antioxidant, 5-15 parts of filler Then put ...

Embodiment 2

[0020] Embodiment 2: a kind of injection molding process of automobile bumper, comprises the following steps:

[0021] 1) Mold preparation: Clean the cavity and core surface of the mold with an organic solvent, after cleaning and drying, spray a release agent, and then heat the mold, keeping the temperature at 210-230°C;

[0022] 2) Injection molding: Ratio materials: 55-80 parts of high-flow polypropylene resin, 40-80 parts of high-impact resin, 30-35 parts of polystyrene resin, 30-35 parts of polyolefin elastomer, 10-20 parts of carbon fiber parts, 5-25 parts of titanium dioxide fiber, 10-15 parts of grafting, 2-12 parts of vulcanizing agent, 10-25 parts of wear-resistant quartz powder, 1-10 parts of anti-aging agent, 6-18 parts of coupling agent, compatibility 1-10 parts of agent, 4-15 parts of toughening agent, 4-15 parts of stiffening nucleating agent, 4-15 parts of anti-impact agent, 4-8 parts of heat stabilizer, 1-10 parts of antioxidant, 5-15 parts of filler Then put ...

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PUM

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Abstract

The invention belongs to the technical field of bumper production, and particularly relates to an injection molding process of an automobile bumper, which comprises the following steps: 1) preparing a mold: cleaning the surfaces of a cavity and a core of the mold by using an organic solvent, cleaning and drying, spraying a release agent, heating the mold, and keeping the temperature at 210-230 DEG C; 2) injection molding: putting a material into a hopper of an injection molding machine, setting the temperature of a screw rod of the injection molding machine, setting the temperature of a first temperature zone to be 170-210 DEG C, setting the temperature of a second temperature zone to be 210-225 DEG C, setting the temperature of a third temperature zone to be 225-235 DEG C, setting the temperature of a fourth temperature zone to be 235-265 DEG C, controlling the pressure to be lower than 20MPa, controlling the extrusion rotating speed of a screw rod of the injection molding machine to be 200-400r / min, and controlling the length-diameter ratio of the screw rod to be (30-60): 1; 3) demolding and curing: after demolding, curing in a drying oven for 12 hours at the temperature of 120-180 DEG C; and (4) surface treatment is conducted, specifically, the surface of a product is subjected to polishing and sand blasting treatment, and the surface quality and structural strength of the formed bumper are improved.

Description

technical field [0001] The invention belongs to the technical field of bumper production, and in particular relates to an injection molding process of an automobile bumper. Background technique [0002] The front and rear ends of the car are equipped with bumpers, which not only have decorative functions, but more importantly, are safety devices that absorb and ease external impact, protect the body and protect the occupants. Wherein the outer plate and the cushioning material are made of plastic, the outer plate and the buffering material are attached to the crossbeam, the crossbeam is connected with the longitudinal beam of the vehicle frame by screws, and the plastic bumper is made of polymer plastic by injection molding. At present, the injection molding process is developing towards shortening the injection molding cycle and improving production efficiency. Generally, in order to improve production efficiency, in the injection molding process of the injection mold, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/77B29C45/00B29C45/78B29C45/76B29C45/60C08L23/12C08L101/00C08L25/06C08L23/00C08K7/08C08K3/36C08K13/04
CPCB29C45/77B29C45/0001B29C45/78B29C45/76B29C45/60C08L23/12C08L101/00B29L2031/3044C08L2205/035
Inventor 何凯
Owner 常州鑫凯车辆部件有限公司