阅读说明：本技术 一种汽车内饰epp制品表面皮纹的制备工艺 (Preparation process of surface dermatoglyph of automotive interior EPP product ) 是由 汪锋 杨毅 王龙珑 于 2019-11-06 设计创作，主要内容包括：本发明公开了一种汽车内饰EPP制品表面皮纹的制备工艺,该制备工艺包括模具成型和皮纹热压。所述皮纹热压包括以下步骤：S1：升温,在热压皮纹机控制界面预设加热温度130℃,向皮纹模具中通入蒸汽,直至皮纹模具内部的温度加热至130℃,将冷却成型后EPP板材的放置皮纹模具中。S2：热压皮纹,热压机带动上下模合模进行热压,热压时间为115-125s,皮纹模具的上模压入到下模内部3mm,在EPP板材表面压出皮纹试样；在温度为130℃的环境下热压115-125s。S3：冷却,皮纹成型后,向皮纹模具中注入冷却水,冷却水进入皮纹模具中进行自然冷却,冷却时间在240-260s之间。使得制成的板材外部皮纹细腻,表皮较硬,耐摩擦,可用于对表观要求较高的场所。(The invention discloses a preparation process of surface dermatoglyph of an automobile interior EPP product, which comprises die forming and dermatoglyph hot pressing. The dermatoglyph hot pressing comprises the following steps: s1: and (3) heating, presetting a heating temperature of 130 ℃ on a control interface of the hot-pressing dermatoglyph machine, introducing steam into the dermatoglyph mold until the temperature inside the dermatoglyph mold is heated to 130 ℃, and placing the cooled and molded EPP plate into the dermatoglyph mold. S2: hot-pressing dermatoglyph, the hot press drives the upper and lower mould to close the mould and carry on the hot pressing, the hot pressing time is 115 plus 125s, the upper mould of the dermatoglyph mould is pressed into the inside 3mm of lower mould, press the dermatoglyph sample on the surface of EPP board; and hot pressing at 130 deg.c for 115-125 sec. S3: and cooling, namely injecting cooling water into the dermatoglyph mold after dermatoglyph molding, and naturally cooling the dermatoglyph mold by the cooling water for 240-260 s. The prepared plate has fine and smooth external skin lines, hard skin and friction resistance, and can be used in places with higher requirements on appearance.)

1. A preparation technology of surface dermatoglyph of an automobile interior EPP product is characterized by comprising the following steps of mould forming and dermatoglyph hot pressing;

the die forming comprises the following steps:

the method comprises the following steps: pre-pressing, namely putting EPP particles to be used into a pre-pressing tank, and pre-pressing for 8 hours in an environment with the pressure of 0.35 MPa;

step two: injection molding, namely injecting the EPP particles subjected to pre-pressing into a molding die, heating the inside of the die by steam to 155-185 ℃, wherein the steam pressure is 7-8Kg, and the molding time is 300 s;

step three: demolding and shaping, namely after the EPP plate is pressed and shaped, introducing cooling water into a forming mold for cooling, and then demolding; placing the demoulded EPP plate into a drying room for drying and shaping; continuously drying for 12h in an environment with the temperature of 75-85 ℃, naturally cooling after drying, and storing for later use;

the dermatoglyph hot pressing comprises the following steps:

s1: heating, presetting a heating temperature of 130 ℃ on a control interface of a hot-pressing dermatoglyph machine, introducing steam into a dermatoglyph mold until the temperature inside the dermatoglyph mold is heated to 130 ℃, and placing the cooled and molded EPP plate into the dermatoglyph mold;

s2: hot-pressing dermatoglyph, the hot press drives the upper and lower mould to close the mould and carry on the hot pressing, the hot pressing time is 115 plus 125s, the upper mould of the dermatoglyph mould is pressed into the inside 3mm of lower mould, press the dermatoglyph sample on the surface of EPP board; hot pressing at 130 deg.c for 115-125 sec;

s3: and cooling, namely injecting cooling water into the dermatoglyph mold after dermatoglyph molding, naturally cooling the dermatoglyph mold after the cooling water enters the dermatoglyph mold, wherein the cooling time is 240-260s, and after the cooling time is finished, opening the dermatoglyph mold and taking out the finished sample.

2. The preparation process of the surface dermatoglyph of the automotive interior EPP product according to claim 1, characterized in that the dermatoglyph mold in the dermatoglyph hot-pressing step comprises an upper mold (8) and a lower mold (1), wherein the middle top end of the upper mold (8) and the middle bottom end of the lower mold (1) are respectively provided with a reinforcing groove along the length direction, and two groups of brackets (3) are welded on two sides of the bottom of the upper mold (8) and two sides of the top of the lower mold (1).

3. The preparation process of the surface dermatoglyph of the automotive interior EPP product according to claim 2, characterized in that one side of the upper die (8) and one side of the lower die (1) are both provided with a steam inlet (6) and a cooling water inlet (7), the other side of the upper die is both provided with a steam outlet and a cooling water outlet, and the steam inlet (6) and the steam outlet and the cooling water inlet (7) and the cooling water outlet are connected through flow channels.

4. The preparation process of the surface dermatoglyph of the automotive interior EPP product as claimed in claim 2, wherein the upper die (8) and the lower die (1) are both internally provided with runners (10), the runners (10) are both spirally bent in the upper die (8) and the lower die (1), and the lower die (1) is internally provided with a die cavity (4).

5. The preparation process of the surface dermatoglyph of the automotive interior EPP product according to claim 2, characterized in that a plurality of plugging plates (2) are connected to two outer sides of the lower die (1) through groove arrangement, one ends of the plugging plates (2) close to the grooves are connected with a fan (12) through a plurality of connecting rods (13), and one ends of the fan (12) far away from the plugging plates (2) are connected with the inside of the grooves through a plurality of electric telescopic columns (14).

6. The preparation process of the surface dermatoglyph of the automotive interior EPP product as claimed in claim 2, wherein the peripheral edge of the top of the lower die (1) is provided with edge grooves (5), the periphery of the bottom of the upper die (8) is vertically connected with plugboards (9), the plugboards (9) are plugged in the edge grooves (5), and the two outer sides of the plugboards (9) are connected with a plurality of sealing strips (10) from top to bottom.

Technical Field

The invention relates to a preparation process of surface dermatoglyph, in particular to a preparation process of surface dermatoglyph of an automobile interior EPP product, belonging to the field of EPP product surface dermatoglyph processing application.

Background

The dermatoglyph preparation is a commonly used manufacturing process in the manufacturing process of EPP products, and the required dermatoglyph can be manufactured outside the EPP products by utilizing the manufacturing process, so that the exterior is more attractive, and the EPP products are suitable for different working requirements.

However, the existing preparation process of the surface dermatoglyph still has certain defects in preparation. The existing preparation process of the surface dermatoglyph is simple in step, lines are usually arranged in a forming die, and the die is arranged in advance according to the size of a product and the surface dermatoglyph. And then putting the pre-pressed EPP material into a mould, and heating and then carrying out injection molding. Through injection molding direct forming, the external dermatoglyph is rougher, and there is the gas pocket in the surface, can not be used for the place that has higher requirements for the surface to the application range of product has been reduced, and the limitation is great.

Disclosure of Invention

The invention aims to provide a preparation process of surface dermatoglyph of an automotive interior EPP product, which can solve the problems that the existing preparation process of the surface dermatoglyph has simple steps, the inside of a forming die is often provided with the dermatoglyph, and the die is arranged in advance according to the size of the product and the surface dermatoglyph. And then putting the pre-pressed EPP material into a mould, and heating and then carrying out injection molding. Through injection molding direct forming, the external dermatoglyph is rougher, and there is the gas pocket in the surface, can not be used for the higher place of surface requirement to the application range of product has been dwindled, the great technical problem of limitation.

The purpose of the invention can be realized by the following technical scheme:

a preparation process of surface dermatoglyph of an automobile interior EPP product comprises die forming and dermatoglyph hot pressing.

The die forming comprises the following steps:

the method comprises the following steps: and pre-pressing, namely putting the EPP particles to be used into a pre-pressing tank, and pre-pressing for 8h under the environment with the pressure of 0.35 MPa.

Step two: and (3) injection molding, namely injecting the EPP particles subjected to pre-pressing into a molding die, heating the inside of the die by steam to 155-185 ℃, wherein the steam pressure is 7-8Kg, and the molding time is 300 s.

Step three: demolding and shaping, namely after the EPP plate is pressed and shaped, introducing cooling water into a forming mold for cooling, and then demolding; placing the demoulded EPP plate into a drying room for drying and shaping; continuously drying for 12h in an environment with the temperature of 75-85 ℃, naturally cooling after drying, and storing for later use.

The dermatoglyph hot pressing comprises the following steps:

s1: and (3) heating, presetting a heating temperature of 130 ℃ on a control interface of the hot-pressing dermatoglyph machine, introducing steam into the dermatoglyph mold until the temperature inside the dermatoglyph mold is heated to 130 ℃, and placing the cooled and molded EPP plate into the dermatoglyph mold.

S2: hot-pressing dermatoglyph, the hot press drives the upper and lower mould to close the mould and carry on the hot pressing, the hot pressing time is 115 plus 125s, the upper mould of the dermatoglyph mould is pressed into the inside 3mm of lower mould, press the dermatoglyph sample on the surface of EPP board; and hot pressing at 130 deg.c for 115-125 sec.

S3: and cooling, namely injecting cooling water into the dermatoglyph mold after dermatoglyph molding, naturally cooling the dermatoglyph mold after the cooling water enters the dermatoglyph mold, wherein the cooling time is 240-260s, and after the cooling time is finished, opening the dermatoglyph mold and taking out the finished sample.

Preferably, dermatoglyph mould in the dermatoglyph hot pressing step includes mould and lower mould, and the top middle-end of going up the mould and the bottom middle-end of lower mould all are provided with the strengthening groove along length direction, and all weld two sets of supports in the bottom both sides of going up the mould and the top both sides of lower mould.

Preferably, one side of the upper die and one side of the lower die are both provided with a steam inlet and a cooling water inlet, the other side of the upper die and the lower die is both provided with a steam outlet and a cooling water outlet, and the steam inlet and the steam outlet and the cooling water inlet and the cooling water outlet are both connected through flow channels.

Preferably, the upper die and the lower die are both provided with runners, the runners are arranged in the upper die and the lower die in a spiral bending mode, and the lower die is provided with a die cavity.

Preferably, the outside both sides of lower mould all are connected with a plurality of shutoff board through the recess setting, and the one end that the shutoff board is close to the recess is connected with the fan through a plurality of connecting rod, and the inside of a plurality of electric flexible post connecting groove is passed through to the one end of keeping away from the shutoff board of fan.

Preferably, the edge groove is arranged at the edge of the periphery of the top of the lower die, the insertion plate is vertically connected to the periphery of the bottom of the upper die, the insertion plate is inserted into the edge groove, and the sealing strips are connected to the two sides of the outer portion of the insertion plate from top to bottom.

The invention has the beneficial effects that:

1. by dividing the forming and the dermatoglyph preparation into two independent steps, the EPP particles are processed into required sample pieces by utilizing a forming die and a dermatoglyph die according to the production requirement in the working process. The lines with skin lines are not needed in the forming die, and the forming is simpler. And the forming and the preparation of the dermatoglyph are divided into separate steps, so that the prepared plate has fine and smooth external dermatoglyph, hard surface and friction resistance, and can be used in places with higher requirements on appearance.

2. The runner is arranged in the dermatoglyph mold, the steam port and the cooling water port are arranged at the end part of the dermatoglyph mold, so that in the heating process of the dermatoglyph mold in work, an external steam pipeline is connected with a steam inlet, steam enters the inside of the dermatoglyph mold, the steam flows from the inside of the runner and then is discharged outwards, and the steam can heat the inside of the dermatoglyph mold. After hot pressing, during cooling, the cooling water inlet is connected with an external cold water pipeline, and the cooling water enters the inside of the flow channel, circulates from the inside of the flow channel and is discharged outwards from the cooling water outlet. The EPP plate surface dermatoglyph is cooled by cooling water, so that the surface can be prevented from being scorched, and the cooling speed and the cooling efficiency are high. Steam heating is used for replacing electric heating, heating is more uniform and softer, and the prepared dermatoglyph is more delicate.

Drawings

In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.

FIG. 1 is a schematic view of a lower mold structure of the dermatoglyph mold of the invention.

Fig. 2 is a schematic diagram of an upper mold structure of the dermatoglyph mold of the invention.

FIG. 3 is a schematic view of the structure of the plugboard of the present invention.

FIG. 4 is a schematic view of the internal structure of the lower mold of the dermatoglyph mold of the invention.

FIG. 5 is a schematic diagram of the structure of the plugging plate of the present invention.

In the figure: 1. a lower die; 2. a plugging plate; 3. a support; 4. a mold cavity; 5. an edge groove; 6. a steam inlet; 7. a cooling water inlet; 8. an upper die; 9. a plugboard; 10. a sealing strip; 11. a flow channel; 12. a fan; 13. a connecting rod; 14. electric telescopic column.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-5, a process for preparing surface skin patterns of an automotive interior EPP product includes molding and hot-pressing skin patterns;

the die forming comprises the following steps:

the method comprises the following steps: pre-pressing, namely putting EPP particles to be used into a pre-pressing tank, and pre-pressing for 8 hours in an environment with the pressure of 0.35 MPa;

step two: and (3) injection molding, namely injecting the EPP particles subjected to pre-pressing into a molding die, heating the inside of the die by steam to 155-185 ℃, wherein the steam pressure is 7-8Kg, and the molding time is 300 s.

Step three: demolding and shaping, namely after the EPP plate is pressed and shaped, introducing cooling water into a forming mold for cooling, and then demolding; placing the demoulded EPP plate into a drying room for drying and shaping; continuously drying for 12h in an environment with the temperature of 75-85 ℃, naturally cooling after drying, and storing for later use;

the dermatoglyph hot pressing comprises the following steps:

s1: heating, presetting a heating temperature of 130 ℃ on a control interface of a hot-pressing dermatoglyph machine, introducing steam into a dermatoglyph mold until the temperature inside the dermatoglyph mold is heated to 130 ℃, and placing the cooled and molded EPP plate into the dermatoglyph mold; the dermatoglyph mould is stainless steel, can make fine and smooth dermatoglyph, is difficult to warp, and is durable.

S2: hot-pressing dermatoglyph, the hot press drives the upper and lower mould to close the mould and carry on the hot pressing, the hot pressing time is 115 plus 125s, the upper mould of the dermatoglyph mould is pressed into the inside 3mm of lower mould, press the dermatoglyph sample on the surface of EPP board; hot pressing at 130 deg.c for 115-125 sec;

s3: cooling, namely injecting cooling water into the dermatoglyph mold after dermatoglyph molding, wherein the cooling water enters the dermatoglyph mold for natural cooling, the cooling time is between 240 seconds and 260 seconds, and after the cooling time is over, the dermatoglyph mold is opened to take out a finished sample; the surface dermatoglyph of EPP panel is regular can be ensured, and the surface dermatoglyph of EPP panel is cooled by cooling water, can prevent that the surface from scalding burnt.

As a technical optimization scheme of the invention, the dermatoglyph mold in the dermatoglyph hot-pressing step comprises an upper mold 8 and a lower mold 1, wherein the middle end of the top of the upper mold 8 and the middle end of the bottom of the lower mold 1 are both provided with reinforcing grooves along the length direction, and two groups of supports 3 are welded on two sides of the bottom of the upper mold 8 and two sides of the top of the lower mold 1.

As a technical optimization scheme of the invention, one side of each of the upper die 8 and the lower die 1 is provided with a steam inlet 6 and a cooling water inlet 7, the other side of each of the upper die and the lower die is provided with a steam outlet and a cooling water outlet, the steam inlet 6 and the steam outlet and the cooling water inlet 7 and the cooling water outlet are connected through flow channels, the steam inlet 6 and the cooling water inlet 7 can conveniently inject steam and cooling water into the die, so that the die can be heated and cooled, and the steam and the cooling water can be timely discharged from the steam outlet and the cooling water outlet, so that the heating and cooling speeds are faster. The temperature rise is more uniform through steam temperature rise, and the temperature rise time is convenient to control.

As a technical optimization scheme of the invention, runners 10 are arranged inside the upper die 8 and the lower die 1, the runners 10 are spirally bent inside the upper die 8 and the lower die 1, the die cavity 4 is arranged inside the lower die 1, the runners 10 facilitate circulation of steam and cooling water, and the bent arrangement enables the steam and the cooling water to stay in the die for a longer time, heat exchange is more sufficient, the efficiency of temperature rise and cooling is improved, and the energy consumption can be reduced.

As a technical optimization scheme of the invention, a plurality of plugging plates 2 are arranged and connected on two sides of the outer portion of a lower die 1 through grooves, one ends, close to the grooves, of the plugging plates 2 are connected with a fan 12 through a plurality of connecting rods 13, one end, far away from the plugging plates 2, of the fan 12 is connected with the inner portion of the grooves through a plurality of electric telescopic columns 14, and when the fan is heated, the electric telescopic columns 14 shrink, so that the plugging plates 2 enter the inner portions of the grooves, and a good sealing and heat-insulating effect can be achieved. During the cooling, 14 extensions of electronic flexible post are released from the recess with shutoff board 2 and fan 12, and fan 12 operation can be bloied to the outside of recess and lower mould 1 for the speed of cooling can adapt to different work demands.

As a technical optimization scheme of the invention, the edge grooves 5 are arranged on the peripheral edge of the top of the lower die 1, the insertion plates 9 are vertically connected to the periphery of the bottom of the upper die 8, the insertion plates 9 are inserted into the edge grooves 5, and a plurality of sealing strips 10 are connected to the two outer sides of the insertion plates 9 from top to bottom, when the upper die 8 and the lower die 1 are clamped with each other, the insertion plates 9 are inserted into the edge grooves 5, and the sealing strips 10 are abutted against the inner walls of the edge grooves 5, so that the joint between the upper die 8 and the lower die 1 can be sealed, and the heat inside the upper die is not easy to dissipate.

When the EPP grain processing mold is used, the EPP grains are processed into required sample pieces by utilizing the forming mold and the dermatoglyph mold according to production requirements. The forming and the preparation of the dermatoglyph are separated into separate steps, so that the prepared plate has fine and smooth external dermatoglyph, hard surface and friction resistance, and can be used in places with higher requirements on appearance.

When the dermatoglyph mold is used, in the temperature rising process, an external steam pipeline is connected with the steam inlet 6, steam enters the inside of the dermatoglyph mold, the steam flows from the inside of the flow channel 10 and then is discharged outwards, and the steam can raise the temperature of the inside of the dermatoglyph mold. After hot pressing and during cooling, the cooling water inlet 7 is connected to an external cold water pipe, and the cooling water enters the inside of the flow channel 10, circulates through the inside of the flow channel 10, and is discharged from the cooling water outlet. The EPP plate surface dermatoglyph is cooled by cooling water, so that the surface can be prevented from being scorched, and the cooling speed and the cooling efficiency are high. Steam heating is used for replacing electric heating, heating is more uniform and softer, and the prepared dermatoglyph is more delicate.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.