Production process and foaming punching die of automobile inner cowl heat insulation pad

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...

Examples

Embodiment 1

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

[0031] 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 120°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 40°C, and the blister molding time is 30s;

[0032] 2), foam punching: put the semi-finished product obtained in step 1) into the foam punching mold, the upper mold of the foam punching mold is provided with a pre-embedded groove, and place the two-component sound-absorbing cotton 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 29...

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 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), foam punching: put the semi-finished product obtained in step 1) into the foam punching mold, the upper mold of the foam punching mold is provided with a pre-embedded groove, and place the two-component sound-absorbing cotton 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 66°C. Pouring into the mold cavity for foaming, the pouring speed is 310g...

Embodiment 3

[0040] A production process for an automobile inner cowl heat insulation pad, characterized in that it includes 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), foam punching: put the semi-finished product obtained in step 1) into the foam punching mold, the upper mold of the foam punching mold is provided with a pre-embedded groove, and place the two-component sound-absorbing cotton 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,...

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...

Examples

Embodiment 1

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

[0031] 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 120°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 40°C, and the blister molding time is 30s;

[0032] 2), foam punching: put the semi-finished product obtained in step 1) into the foam punching mold, the upper mold of the foam punching mold is provided with a pre-embedded groove, and place the two-component sound-absorbing cotton 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 29...

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 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), foam punching: put the semi-finished product obtained in step 1) into the foam punching mold, the upper mold of the foam punching mold is provided with a pre-embedded groove, and place the two-component sound-absorbing cotton 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 66°C. Pouring into the mold cavity for foaming, the pouring speed is 310g...

Embodiment 3

[0040] A production process for an automobile inner cowl heat insulation pad, characterized in that it includes 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), foam punching: put the semi-finished product obtained in step 1) into the foam punching mold, the upper mold of the foam punching mold is provided with a pre-embedded groove, and place the two-component sound-absorbing cotton 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,...

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