Process method for injection molding of automobile bumper assembly
An injection molding process and automobile bumper technology, which is applied to household components, household appliances, and other household appliances, etc., can solve the problems that the degree of shrinkage cannot be quantified in real time, factors are complex and unstable, etc., so as to improve production efficiency and pass rate Effect
Active Publication Date: 2017-03-08
WUHAN LIAOYUAN MOLDING
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Problems solved by technology
[0005] The technical problem to be solved by the present invention is to overcome the defects of the prior art, provide a method to solve the problem that the shrinkage degree cannot be quantified and judged in real time due to the complex and unstable factors affected by the post-shrinkage in the injection molding process of the automobile bumper assembly, and improve the qualification of the product. Automobile bumper assembly injection molding process with high efficiency and high production efficiency
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[0026] In order to make the content of the present invention more easily and clearly understood, the present invention will be described in further detail below according to specific embodiments and in conjunction with the accompanying drawings.
[0027] The product structure design of this embodiment: for the parts with high flush and clearance requirements, the structure design is fully considered in the design stage, so as to shield the influence effect to the maximum extent.
[0028] Selection of raw materials for injection molding: The main materials used for exterior parts such as bumpers are PP+EPDM and modified products of talcum powder filled with ash content of 10-20‰. The incoming inspection and monitoring of raw materials, the control of the ash content of the raw material filling, the ratio has no tolerance, it is an absolute value, and the allowable error is only 0.05-0.1 per thousand, which can be measured by an ash content detector.
[0029] The material shrink...
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The invention provides a process method for injecting molding of an automobile bumper assembly. The process method are characterized in that raw material for injection molding are PP+EPDM and talcum powder of which filled ash accounts for 1-2%; the material shrinkage rate selects a mode shrinkage rate as a reference value, and an intermediate value 1.0% is taken; the control of process parameters during injection molding comprises sequential injection by adopting multiple pouring gates, wherein the pouring gates are uniformly distributed on the upper surface and the lower surface of a bumper equidistantly, and a maximum limit value is set for the glue feeding quantity of the pouring gates at middle positions of the upper and lower surfaces; the control of an injection process comprises speed control and pressure control; a cooling-water machine is used for keeping the temperature of a mold constant; and a charging barrel is divided into multiple sections, the temperature in the middle is high, and the temperatures on two sides are decreased progressively. According to the method provided by the invention, the problem that the shrinkage degree cannot be quantitatively determined in time due to complex and unstable factors of after-shrinkage influences during injection molding of the automobile bumper assembly can be solved, the qualification rate of products can be improved, and the production efficiency can be improved.
Description
technical field [0001] The invention relates to the technical field of injection molding technology, in particular to an injection molding process method for an automobile bumper assembly. 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 mitigate external impact forces, protect the body and protect the body and occupants. Bumpers have the functions of safety protection, decoration of the vehicle, and improvement of the aerodynamic characteristics of the vehicle. From a safety point of view, when a low-speed collision accident occurs, the car can play a buffering role to protect the front and rear car bodies; it can play a certain role in protecting pedestrians in the event of an accident with pedestrians. In terms of appearance, it is decorative and has become an important part to decorate the appearance of the car; at the same time, ...
Claims
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Patent Timeline
Login to View More IPC IPC(8): B29C45/00B29C45/77B29C45/78B29L31/30
CPCB29C45/00B29C45/0001B29C45/0025B29C45/77B29C45/78B29C2945/76498B29C2945/76531B29C2945/76595B29L2031/3044
Inventor 胡明润陈才华
Owner WUHAN LIAOYUAN MOLDING