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Low-pressure chemical foaming injection mold of automobile inner plate and forming method thereof

A technology of low-pressure chemistry and injection molding, which is applied to household appliances, other household appliances, household components, etc., can solve the problems of high internal stress, mixing, and high equipment investment costs in products, so as to reduce production costs, increase product strength, and improve surface quality. Good results

Pending Publication Date: 2018-01-09
QUANXING TOOLING EQUIP NANJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the weight of the product is rated, it is necessary to strictly control the production materials, so that the product is self-heavy; the disadvantages of this are: the glue inlet is too short, the material head is too thin, and the appearance defects increase due to the adjustment and improvement of the injection molding machine process
The disadvantage of high-pressure chemical foaming is that the internal stress of the product is too large and easy to deform
The disadvantage of physical foaming is that physical foaming is often used for nitrogen injection and mixed into the material tube for filling and injection molding, and the equipment investment cost is high

Method used

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  • Low-pressure chemical foaming injection mold of automobile inner plate and forming method thereof
  • Low-pressure chemical foaming injection mold of automobile inner plate and forming method thereof
  • Low-pressure chemical foaming injection mold of automobile inner plate and forming method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Such as figure 1 Shown, a kind of low-pressure chemical foaming injection mold of automobile inner panel, other comprises upper mold bottom plate 1, lower mold bottom plate 2, upper mold 3, lower mold 4, gas storage tank 5 and hot runner 6; Said upper mold 3 installs On the upper mold bottom plate 1, the lower mold 4 is installed on the lower mold bottom plate 2, and a mold cavity 9 is formed between the upper mold 3 and the lower mold 4, and the mold cavity 9 communicates with the gas storage tank 5, and the mold cavity The side wall of 9 is provided with a sprue, and the mold cavity 9 communicates with the hot runner 6 through the sprue; a mold lifting cylinder 11 is also installed on the bottom plate 2 of the lower mold, and the output end of the lifting mold cylinder 11 is connected to the mold lifting One end of the top block 12, the other end of the lifter top block 12 is connected to the upper mold bottom plate 1, and is used to control the lifting of the upper m...

Embodiment 2

[0032] Use the injection mold described in Example 1 to carry out the product molding operation, specifically: when injecting plastic particle polypropylene (PP+glass fiber), first inject a plastic volume of 2.0t, and then press and release it precisely through the equipment, and rise to 3.5t is foam filled to achieve light weight and high precision strength. When the pressure reaches 0.8-2.0MPa, the molten mixture of plastic particles and foaming agent (barrel temperature is 260 degrees Celsius) is injected into the mold cavity (the upper mold is closed and the lower mold is injected) for a period of time (5- 10S), at the same time, the gas in the mold is slowly discharged through the vent hole, and then the upper mold plate of the mold clamping mechanism moves backward for a certain distance (the moving distance is set as the thickness of the product, and the thickness of the inner plate is 3mm), so that the lower mold of the mold Separate from the upper mold, extend the par...

Embodiment 3

[0034] The injection mold in the first embodiment and the injection molding method in the second embodiment are used for specific applications.

[0035] Example: The door inner panel of a certain brand of automobile is used as the development and production verification, and the thickness of the trial product without foaming agent is t2.0mm (the following data sources are trial weight data)

[0036]

[0037]

[0038] ①The average weight of the inner panel on the right side of the front door without foaming agent is 595g, and t=2.0mm. When t=1.0mm, the estimated unit weight is 595 / 2=297.5g. When t=3.5mm, the estimated unit weight is 297.5*3.5=1041.25g, weight loss: 441g.

[0039] ②The average weight of the rear right inner panel without foaming agent is 377g, t=2.0mm, then the estimated unit weight is 377 / 2=188.5g when t=1.0mm, and when t=3.5mm, calculate the tentative list The weight is 188.5*3.5=659.75g, and the weight loss is 259g.

[0040]

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Abstract

The invention discloses a low-pressure chemical foaming injection mold of an automobile inner plate. The low-pressure chemical foaming injection mold comprises an upper die bottom plate, a lower die bottom plate, an upper die, a lower die, an air storage tank and a hot runner, wherein the upper die is installed on the upper die bottom plate, the lower die is installed on the lower die bottom plate, a mold cavity is formed between the upper die and the lower die, the mold cavity communicates with the air storage tank, additionally, a pouring gate is formed in the side wall of the mold cavity, and the mold cavity communicates with the hot runner through the pouring gate; a die lifting cylinder is installed on the lower die bottom plate, the output end of the die lifting cylinder is connectedwith one end of a die lifting jacking block, the other end of the die lifting jacking block is connected with the upper die bottom plate, and the die lifting jacking block is used for controlling theupper die bottom plate and the upper die to lift. In addition, the invention further discloses a forming method which adopts the low-pressure chemical foaming injection mold of the automobile inner plate. The method has the advantages that the use cost of materials is reduced, the internal stress of a product is small, shrinkage marks are eliminated, and the deformation of warping and the like are difficult to generate.

Description

technical field [0001] The invention relates to the technical field of injection molding technology, in particular to a molding method of a low-pressure chemical foaming injection mold for an automobile inner panel. Background technique [0002] In the use of automotive injection molded parts, the usage of many modules depends on injection molding supplies. However, due to the large number of auto parts, different types of injection molded parts are required, so that the manufacturing volume of injection molded parts cannot be widely promoted, and it is used in automobile manufacturing. Also relatively cumbersome. [0003] At present, in order to save costs and have fewer appearance defects, automotive interior parts usually have a rated product weight and have too high requirements for product appearance. However, when the weight of the product is rated, it is necessary to strictly control the production materials, so that the product is self-heavy; the disadvantages of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C44/58B29C44/02B29C44/60B29K23/00B29L31/30
Inventor 刘丰达
Owner QUANXING TOOLING EQUIP NANJING
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