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Production technology of automobile front-wall heat-insulation pad and foam punching die

A technology of production process and punching die, which is applied in the production process of automobile inner cowl heat insulation pad and the field of foaming punching die, can solve the problems of high production cost, poor product VOC performance, long production cycle, etc., and achieve production cost Reduced, good bonding stability, the effect of production cost control

Active Publication Date: 2014-05-28
GREAT WALL MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1) The production cycle is longer: Whether it is closed mold foaming or mold opening foaming, it will increase the post-process, increase labor costs, and affect the production cycle;
[0005] 2) Poor product consistency: the sound-absorbing cotton is mainly artificially bonded, which results in poor consistency of the bonding position of the product, and it is easy to cause the sound-absorbing cotton to block holes, affecting product loading;
[0006] 3) The VOC performance of the product is poor: Generally, hot-melt adhesives are used in the post-process to bond the two-component sound-absorbing cotton. The glue-like substances contribute a lot to the benzene-like substances in the product assembly, resulting in the vehicle's VOC failure , does not meet the regulatory requirements;
[0007] 4) The production cost of the product is high: the post-process requires two operators, and hot-melt adhesive is used for bonding, so the production cost is high

Method used

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  • Production technology of automobile front-wall heat-insulation pad and foam punching die

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A production process of an automobile inner cowl heat insulation pad, comprising the following two processing steps:

[0031] 1) Blister forming: The EVA material is baked at high temperature. After the EVA material is baked at high temperature, its surface temperature is 120°C. The baked EVA material is placed on the blister mold to form the semi-finished product. Production, wherein the temperature of the blister mold is 40°C, and the blister molding time is 30s;

[0032] 2) Foaming punching: Place the semi-finished product obtained in step 1) into the foaming punching mold. In the tank, the semi-finished product is punched during the pressure holding process after the foaming punching mold is closed. The temperature of the foaming punching mold is 65°C. Pouring into the mold cavity for foaming, the pouring speed is 290g / s, the raw material temperature is 25°C, the pouring pressure of material A is 120bar, the pouring pressure of material B is 110bar, and the ambient...

Embodiment 2

[0035] A production process of an automobile inner cowl heat insulation pad, comprising the following two processing steps:

[0036] 1) Blister molding: The EVA material is baked at high temperature. After the EVA material is baked at a high temperature, its surface temperature is 140°C. The baked EVA material is placed on the plastic mold for blister molding to complete the semi-finished product. Production, wherein the temperature of the blister mold is 20°C, and the blister molding time is 25s;

[0037] 2) Foaming punching: Place the semi-finished product obtained in step 1) into the foaming punching mold. In the groove, after the foaming punching mold is closed, the semi-finished product is punched during the pressure holding process. The temperature of the foaming punching mold is 66°C. Pouring into the mold cavity for foaming, the pouring speed is 310g / s, the raw material temperature is 25°C, the pouring pressure of material A is 160bar, the pouring pressure of material...

Embodiment 3

[0040] A production process for an automobile inner cowl heat insulation pad, characterized in that it comprises the following two processing steps:

[0041] 1) Blister molding: The EVA material is baked at high temperature. After the EVA material is baked at high temperature, its surface temperature is 130°C. The baked EVA material is placed on the plastic mold for blister molding to complete the semi-finished product. Production, wherein the temperature of the blister mold is 30°C, and the blister molding time is 25s;

[0042]2) Foaming punching: Place the semi-finished product obtained in step 1) into the foaming punching mold. In the groove, after the foaming punching mold is closed, the semi-finished product is punched during the pressure holding process. The temperature of the foaming punching mold is 66°C. Pouring into the mold cavity for foaming, the pouring speed is 300g / s, the raw material temperature is 23°C, the pouring pressure of material A is 140bar, the pourin...

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Abstract

The invention provides a production technology of an automobile front-wall heat-insulation pad, comprising the following two processing steps: 1) plastic uptake shaping; and 2) foam punching. The invention also provides a foam punching die used in the production technology. The invention has advantages and positive effects as follows: 1) production pace is accelerated; 2) consistency of a product is good; 3) VOC performance of the product is improved; and 4) production cost of the product is reduced: two post-procedure operators are saved, there is no superfluous binder, and production cost is controlled effectively.

Description

technical field [0001] The invention relates to the technical field of auto parts, in particular to a production process of an automobile inner cowl heat insulation pad and a foaming punching die Background technique [0002] The main components of existing foamed car front wall insulation pads are EVA+PU foam+two-component sound-absorbing cotton. The molding process is mainly divided into two categories: open mold foaming and closed mold foaming. The two types of molding processes are divided into EVA blister, foaming punching and post-processing are composed of three processes. EVA blistering is mainly that EVA material is baked at high temperature, placed on the adsorption mold for adsorption molding; foaming punching process mainly absorbs the semi-finished products of the previous process. Place the lower mold of the foaming die-cutting mold according to the shape, and pour the foaming material on the top or pour the foaming material after the mold is closed. The former...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C69/00B29C51/10B29C44/12B29C44/60B29C44/58B29C71/02
Inventor 刘新义宋伟康杜洪超赵磊许琰
Owner GREAT WALL MOTOR CO LTD
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