Integrally-formed automobile EPP ceiling and preparation method thereof

A roof and integrated technology, applied in the field of automotive EPP roof and its preparation, can solve the problems of bad influence of strength, influence of fabric covering fit, and decrease of bonding strength, etc.

Active Publication Date: 2020-05-29
四川诺阳汽车部件有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high-pressure water cutting or die-cutting (mold with gun head) is used to form the ceiling outline and openings. However, due to the problem of poor cutting accuracy, it is easy to cause problems such as poor dimensional control and burrs.
Moreover, due to the heating and pressing of the plate, the bending part of the plate becomes thinner, so the strength of the car roof is uneven, and the strength of the bending boundary is relatively weak. During the driving process, the strength of the bending boundary is easily affected by adverse effects, and also Prone to stress damage, which in turn affects the service life of the roof
Moreover, the car roof in the prior art cannot meet the requirements of light weight, and cannot achieve the purpose of weight reduction
In the prior art, EPP is also used instead of PP as the car roof to meet the lightweight requirements, but because the board is also directly heated and extruded, the above problems also exist
In addition, the existing mounting brackets and sunroof reinforcement frames for automotive roof interiors are generally bonded to the roof substrate with hot-melt adhesives. This bonding method will age during long-term use and lead to a decrease in bonding strength, which will lead to falling off or damage ;Damage the ceiling light or fall from the ceiling, which is easy to cause damage to personal safety
And excessive use of glue not only affects the overall force of the ceiling, but also causes odor and VOC. Too much adhesive fixing structure affects the surface smoothness of the ceiling and affects the covering and fit of the fabric. The connection structure can also cause abnormal noise
Moreover, the interior mounting bracket still has the problem of poor toughness, and it cannot play a good buffering role in the case of strong vibration or impact during the driving of the vehicle, and it is prone to breakage

Method used

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  • Integrally-formed automobile EPP ceiling and preparation method thereof
  • Integrally-formed automobile EPP ceiling and preparation method thereof
  • Integrally-formed automobile EPP ceiling and preparation method thereof

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preparation example Construction

[0034] A kind of preparation method of the integrated automobile EPP ceiling of the present embodiment, comprises the following steps:

[0035] a. Preloading: The EPP raw material particles are prepressed by means of staged pressurization to generate internal stress inside the particles. The six-stage staged pressurization method is adopted, respectively: preloading process 0, pressure 0.2-0.4 bar, the time is 25-35min; pre-pressing process 1, the pressure is 3.5-4.5bar, the time is 7-9h; pre-pressing process 2, the pressure is 3.5-4.5bar, the time is 25-35min; pre-pressing process 3, the pressure The pressure is 2.5~3.5bar, the time is 25~35min; the prepressing process 4, the pressure is 1.5~2.0bar, the time is 25~35min; the prepressing process 5, the pressure is 1.5~2.0bar, the time is 80~100h; The setting of the stage pressure and the setting of the pressing time corresponding to each stage of pressure enable the EPP particles to fully expand and foam in the particle pre-pr...

Embodiment 1

[0043] The method for preparing the car roof by EPP surface overmolding of the present embodiment may further comprise the steps:

[0044] a. Pre-pressing: Pre-pressing the EPP raw material particles by means of staged pressurization; pre-pressing process 0, the pressure is 0.2bar, and the time is 25min; pre-pressing process 1, the pressure is 3.5bar, and the time is 7h; Pressing process 2, the pressure is 3.5bar, the time is 25min; pre-pressing process 3, the pressure is 2.5bar, the time is 25-35min; pre-pressing process 4, the pressure is 1.5bar, the time is 25min; pre-pressing process 5, the pressure is 1.5bar, the time is 80h;

[0045] b. Lock and fix the solid mold and the moving mold of the mold, then inject steam into the mold cavity to preheat the mold cavity, and then send the EPP raw material particles from the barrel through the pressurized feeding air Enter the mold cavity, and pass the flowing air with pressure into the mold cavity so that the EPP raw material pa...

Embodiment 2

[0050] The method for preparing the car roof by EPP surface overmolding of the present embodiment may further comprise the steps:

[0051] a. Pre-pressing: Pre-pressing the EPP raw material particles by means of staged pressurization; pre-pressing process 0, pressure 0.4bar, time 35min; pre-pressing process 1, pressure 4.5bar, time 9h; pre-pressing process Pressing process 2, the pressure is 4.5bar, the time is 35min; pre-pressing process 3, the pressure is 3.5bar, the time is 35min; pre-pressing process 4, the pressure is 2.0bar, the time is 35min; pre-pressing process 5, the pressure is 2.0bar , the time is 100h;

[0052] b. Lock and fix the solid mold and the moving mold of the mold, then inject steam into the mold cavity to preheat the mold cavity, and then send the EPP raw material particles from the barrel through the pressurized feeding air Enter the mold cavity, and pass the flowing wind with pressure into the mold cavity so that the EPP raw material particles are eve...

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PUM

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Abstract

The invention discloses an integrally-formed automobile EPP ceiling. The EPP ceiling is integrally formed by an EPP material and has the characteristics of light weight, good heat insulation property,low odor and low VOC generation; the formed ceiling is good in thickness uniformity; the bending boundary strength of the ceiling is high; the overall strength of ceiling is high, the EPP ceiling hasexcellent mechanical properties and long service life, can be well assembled and contacted with automobile body roof metal parts, does not produce abnormal sound in the driving process, has a more regular surface after being assembled, can be more fitted with coated woven cloth and the like, reduces wrinkles, has good smoothness, can save oil consumption, can improve the driving safety coefficient and can enhance the riding comfort. The forming process is easy to operate and can be completed only through one set of forming die and supporting facilities of the forming die, the production costis reduced, and the high-quality product rate is increased in a one-time forming mode.

Description

technical field [0001] The invention relates to the field of automobiles, in particular to a lightweight, environment-friendly and integrally formed automobile EPP roof and a preparation method thereof. Background technique [0002] The roof is an important part of the interior of the car. Its main function is to improve the decoration inside the car. At the same time, the roof can also improve the heat insulation and heat insulation effect from the outside of the car; reduce the noise inside the car and improve the sound absorption effect; Ride comfort and safety. The molding of the ceiling is generally formed by compression molding, and the PP sheet is more commonly used. The PP sheet is put into a metal (or resin) male and female mold, and it is heated and pressurized to be cured. The roof profile and openings are formed by high-pressure water cutting or die cutting (the mold has a gun head), but due to the problem of poor cutting accuracy, it is easy to cause problems s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60R13/02B60R16/02B29C69/00B29C43/02B29C43/58B29K23/00
CPCB60R13/0231B60R16/0215B29C69/00B29C43/021B29C43/58B29K2023/12B29C2043/5808B29C2043/5816
Inventor 程建军邓勇贺昌华
Owner 四川诺阳汽车部件有限公司
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