KR100346496B1 - Forming device and method for wallboard of vehicle - Google Patents

Abstract

The present invention relates to a molding method of a vehicle interior material and a molding apparatus thereof, but in the past, two open molds for substrate injection molding and skin material bonding were provided on one fixed mold to reduce mold equipment cost. It is not very efficient in reducing mold equipment cost and working time because it works by moving open molds alternately.

Therefore, in the present invention, when the injection molding of the substrate 10, the thickness of the stepped portion B is molded to a thickness thicker than the thickness of the planar portion A by the thickness t of the skin material 20, and the molding thereof is performed at the same time. A preliminary primary cooling step in which the surface of the substrate 10 is aged and the inside thereof maintains liquidity; A process of releasing the injection pressure and opening the open mold 30 is performed. Then, the skin material 20 is introduced onto the substrate 10 and press pressure is applied to the injection liquid inside the substrate 10. ) Volumetrically moving the stepped portion B from the stepped portion B to the planar portion A so that the base material 10 is completely aged by secondary cooling while being adhesively molded with the skin material 20 to a uniform thickness as a whole; By the process of releasing the press pressure and removing the finished product by opening the open mold 30, a high-quality interior material having a uniform feel is completed in a faster time than before, and thus quality and price competitiveness can be improved.

Description

Forming method of automobile interior materials and forming apparatus thereof {Forming device and method for wallboard of vehicle}

The present invention relates to a method for molding automotive interior materials and a molding apparatus thereof, in particular, a substrate having fluidity due to residual heat when continuously performing the bonding process of the skin material after the injection molding process of the substrate in a pair of open / fixed molds. It is to provide a molding method and a molding apparatus for automotive interior materials that can be improved in productivity and quality by enabling the molding of the interior material of uniform thickness without damaging the skin material using the volumetric flow of the.

Generally, interior materials of automobiles include door trims, fillers, trunk mats, package trims, headliners, etc. Among these interior materials, injection molding is performed using only hard materials based on cheap national cars, small cars, or medium / large luxury cars. Alternatively, the skin material may be adhered to the surface of the substrate, but the trimmed edges thereof may be used together. In order to improve the feel, the soft skin material may be adhered to the surface of the substrate and then the edge of the skin may be wrapped around the inner surface of the substrate.

The materials of the hard substrate include PP, PE, PP PP, POLY-PROPYLENE BOARD, ABS, WOOD STOCK, and the like. RESIN FELT is mainly used, and the skin material is PE FOAM, PP FOAM, PU FOAM attached on the back of non-woven fabric, fabric, or skin paper made of PVC. It is mainly used.

In addition, there are low pressure injection method and high pressure injection method as the base material injection molding and the attachment method of the skin material of the interior material, the low pressure injection method of the injection molding the base material injection liquid to the molding surface of the fixed mold at a low pressure and then the skin When the injection liquid is pressed into an open mold on which ash is placed and a high-pressure press pressure is applied, the injection liquid is molded into a substrate of a predetermined type, wherein the skin material is simultaneously bonded to the surface of the substrate to be molded.

This low-pressure injection method is a good productivity because the base molding and the skin material adhesion is made at the same time. However, if the surface skin paper material of the skin material is fabric or non-woven fabric, the quality is lowered, such as the injection of the base material appears in various places by the pressure when pressed with an open mold with high-pressure press pressure. Material is limited.

In addition, the raw material of the base material should be used for low pressure, which is expensive, and the foam layer of the skin material should use a low magnification foam. As the press pressure of the high pressure acts, the foam layer of the skin material is severely pressed and thinned. In particular, the stepped corners are pressed more severely, and the texture of the interior material is considerably deteriorated due to the poor texture. Poor quality for use in luxury cars.

In addition, the low-pressure injection machine as described above is quite expensive (about 2 to 3 billion won), so domestic parts makers producing and supplying various interior materials of automobiles have a considerable cost burden to equip their injection facilities. .

And, the high-pressure injection method is to inject the substrate injection liquid into the molding surface in the state of engaging the open / fixed mold to mold the substrate first, then transfer the matured substrate to the skin material attachment mold and adhere the skin material on the substrate That's the way. In other words, the first production of the base material, and then the method of producing the interior material by the process of bonding the skin material in a later process.

Since the high pressure injection method uses a general press and an injection machine, the cost of constructing the equipment is lower than that of the low pressure injection method, but when the skin material is adhered to the surface of the substrate, the adhesive material is manually bonded after spraying the adhesive bond. There is a problem that productivity is poor due to poor workability, each time the spray of the adhesive bond is severely polluted air in the workplace is a lot of environmental pollution.

In addition, the high-pressure injection method currently used in the industry engages a pair of upper and lower injection molds and injects the substrate liquid at high pressure to inject the substrate, and then completely cools and removes the substrate from the injection mold, and then attaches a separate skin material. It is a method of molding interior materials by transferring to a mold and bonding the skin material.

Since the high pressure injection method cools the substrate immediately after injection molding and removes it from the injection mold, the shrinkage (strain) of the substrate is severe, and in particular, the injection mold equipment of the substrate and the adhesive mold equipment of the skin material must be separately provided. Many, there is a problem that occupies a lot of installation place, because the base material is moved to another mold after molding the base material to bond the skin, there are a lot of processes and the work takes a long time, there is a problem that the productivity is significantly reduced.

Therefore, in order to solve the above problems of the high-pressure injection method, a first open mold for forming the substrate and a second open mold for attaching the skin material (open molds having side surface gaps corrected by the thickness of the skin material) are separately provided on the fixed mold for injection of the substrate. Then, when the substrate is molded, the first open mold is bonded to the fixed mold, and when the skin material is bonded onto the molded substrate, the second mold is bonded to the fixed mold to form a skin material layer on the plane and side surfaces. Applicant has been patented as the invention patent No. 234468 by developing a method that is almost uniformly bonded.

However, this also has a burden of equipment cost to be equipped with two open molds, and work by moving the two open molds alternately, compared to the work to separate the injection molding mold and the skin adhesive mold Time was not shortened so much.

The present invention is to solve the conventional problems as described above, the object of the present invention by mixing only the advantages of the low-pressure injection method and the advantages of the high-pressure injection method of only a pair of open / fixed mold base material for interior materials and the bonding process of the skin material The present invention provides a molding method and a molding apparatus for automobile interior materials which can reduce the cost burden of a mold facility and improve productivity by the speed of work.

1 is a cross-sectional view schematically illustrating a state in which a molding space is formed by engaging an open / fixed mold of the present invention.

Figure 2 is a cross-sectional view schematically illustrating a state of injection molding the substrate with an open / fixed mold of the present invention

3 is a cross-sectional view schematically illustrating a state in which an open mold is opened and a skin material is supplied after precooling an injection molded substrate in the present invention.

Figure 4 illustrates a state in which the fluid injection inside the fluid substrate of the stepped portion that is not thickness correction when the skin material is pressed to the substrate by press pressure in the present invention is formed in a thickness almost equal to the stepped portion and the planar portion Some cross section

Explanation of symbols for the main parts of the drawings

10: base material 20: skin material

30: open mold 40: fixed mold

50: forming space A: flat part

B: stepped part L1, L2: gap

Hereinafter, described in detail by the accompanying drawings, the technical configuration and operation that can effectively achieve the object of the present invention as a preferred embodiment as follows.

Referring to the configuration of the automotive interior molding apparatus for achieving the present invention by FIG. 1, the molding surfaces 31 and 41 are engaged with each other to form a molding space 50, and cooling water is formed along the molding surfaces 31 and 41. Open / fixed molds 30 and 40 respectively formed therein with circulating cooling holes (not shown); A nozzle (60) for supplying an injection solution of the substrate (10) to the molding space (50); It is composed of a clamp 70 for supplying the skin 20 to the base 10 of the stationary mold 40 while being lifted by the cylinder 71.

The characteristics of the present invention is that when the open / fixed molds 30 and 40 are engaged with each other to form the molding space 50, the distance L2 of the stepped portion B rather than the distance L1 of the planar portion A is formed. ) Is formed to be wider by the thickness t of the skin material 20.

The method for manufacturing the interior material for automobiles of the present invention by such a mold apparatus will be described in detail for each process as follows.

First Process (Injection Molding and Primary Cooling Process)

Injecting the substrate injection liquid at a high pressure through the nozzle 60 into the molding space 50 formed by engaging the molding surface of the open / fixed mold 30, 40, to mold the substrate 10 by a high-pressure injection method, In this case, as shown in FIG. 1, since the space L2 of the stepped portion B is wider by the thickness t of the skin material 20 than the space L1 of the planar portion A, FIG. 2. As described above, the injection-molded base material 10 becomes the primary temporary mold in a state in which the thickness of the stepped portion B is thicker than the thickness of the planar portion A by the thickness t of the skin material 20.

In this state, the mold surface of the open / fixed molds 30 and 40 cools and matures the primary temporarily molded substrate 10 at a temperature set by the cooling water circulating through the cooling holes. It is pre-primary cooled and aged only to the extent that the inside can maintain the fluidity of the liquid without cooling to the point of full ripening.

2nd process (press pressure 1st release process)

When the pre-aging process is completed to the extent that the inside of the substrate 10 of the first process maintains the fluidity of the liquid phase, the injection press pressure is first released as shown in FIG. 3, and the open mold 30 is opened. The inside of the substrate 10 placed in the) is less mature, there is a liquid flow state, but the outer surface of the substrate 10 is aged to some extent by a preliminary cooling process, so even when the open mold 30 is opened, the substrate liquid inside is aged. There is no risk of piercing the outer surface of the surface.

In addition, when the open mold 30 is opened in a state in which the preliminary cooling of the substrate 10 to mature the outer surface as described above, only the open mold 30 is easily detached from the open mold 30. Opening can keep the molding state of the substrate 10 very good.

3rd process (surface material input and bonding and secondary cooling process)

As soon as the two processes are completed, the skin material 20 mounted on the clamps 70 of both cylinders 71 is supplied to the base 10 placed in the stationary mold 40, and then the open mold 30 is opened. Close the fixed mold 40 and press the pressure again, the press pressure is lower than the high pressure when injection molding, that is, the foam layer or adhesive film (not shown in the drawing) of the adhesive surface of the skin material 20 A press pressure is applied to the extent that the base 10 can stick to the base 10 while melting in latent latent heat of the base 10.

At this time, the spacing (L) of the planar portion (A) of the open / fixed molds 30 and 40 meshed with each other again is a known spacer (not shown in the drawing) that is fitted between the edges of the open / fixed molds 30 and 40. When the open mold 30 is lowered as much as the thickness is corrected in a state where the thickness of the planar portion A of the substrate 10 and the thickness t of the skin material 20 are combined to thereby press pressure.

However, the gap L2 of the stepped portion B is not corrected by the spacer, and thus press pressure is applied while maintaining the same interval as the first time, so that the substrate 10 is pressed down as much as the thickness of the skin material 20. 20).

Then, as shown in FIG. 4, the substrate 10 of the stepped portion B is less mature, and thus, the injection liquid therein is fluidized into the flat portion A while being pressed by the thickness of the skin 20. In the state in which 20 is attached, the thickness of the stepped portion B and the planar portion A is maintained by the volume flow as described above, and the base 10 and the skin material at the stepped portion B are the same. There is no fear that the skin 20 is excessively pressed when the 20 is bonded, and the skin 20 is adhered without being damaged, and the base 10 is completely formed. At this time, the mold surface of the open / fixed molds 30 and 40 undergoes a secondary cooling process at a set temperature to completely mature the molded substrate 10.

4th process (2nd press pressure release process)

When the aging of the molded substrate 10 is completed in the above process, the secondary press pressure is released and the open mold 30 is opened again to remove the molded product from the fixed mold 40.

After cutting the edge of the outer skin material 20 that escapes to the outside of the product like the existing interior materials, piercing the inner mounting hole, and wrap the cut edge around the inner surface of the substrate 10, the overall feel of high-quality automobile You can get the interior materials.

The present invention is a complete molding of the secondary molding step and the secondary cooling and secondary press pressure release through the primary molding step of the high-pressure injection substrate 10 and the pre-aging step of the primary cooling and primary press pressure release and Since the substrate 10 is annealed through two molding and aging steps, such as a aging step, the finished product is very good in its molding state, and there is little risk of shrinkage (strain).

And, in the present invention, the adhesive surface foam layer or film paper of the skin material 20 is melted with latent heat latent in the pre-cooled base material 10 without using an adhesive in the skin material 20 bonding process as in the prior art. There is no fear of environmental pollution caused by the use of adhesives.

As described above, the present invention can perform the bonding process of the base material for the interior material and the skin material with only one pair of open / fixed molds, thereby minimizing the cost burden of the mold equipment, and also greatly increasing the productivity due to quick and easy workability. As it is possible to reduce the cost compared to the existing production method, it is a top / bottom molding mold. It can maintain, so the touch and strength are uniform, which greatly improves the quality and price competitiveness.

Claims (3)

In the molding method for high-pressure injection of the substrate 10 by injecting the substrate injection liquid at a high pressure into the molding space 50 of the open / fixed mold 30, 40 through the nozzle 60, When injection molding the substrate 10, the stepped portion B has a thickness thicker than the thickness of the flat portion A by the thickness t of the skin material 20, and at the same time, the open / fixed mold ( 30) The first surface of the substrate 10 is cooled to a temperature at which the mold surface is set so that the surface of the substrate 10 is aged and the inside of the substrate 10 is pre-aged to an extent that the injection liquid can maintain the fluidity of the liquid phase. A first step; A second step of releasing the high-pressure injection press pressure after the process and opening the open mold 30; After the process, the skin 20 is placed on the base 10 of the stationary mold 40, the open mold 30 is closed, and a second press pressure is applied to the less mature and flowable substrate of the step B. 10) While the injection liquid inside is moved from the stepped portion B to the planar portion A by the thickness of the skin 20, adhesive molding of the substrate 10 and the skin 20 is performed with a uniform thickness. At the same time, performing a second cooling to the set temperature of the surface of the mold to complete molding of the product; A fourth step of releasing the second press pressure after the step and opening the open mold 30 again to remove the molded product from the fixed mold 40; Molding method of a vehicle interior material characterized in that consisting of. The method of claim 1, wherein the secondary press pressure of the third process is characterized in that the press pressure is lower than the injection pressure to the extent that the skin 20 can adhere to the substrate 10 while melting the residual heat of the substrate 10. Molding method of interior materials for automobiles Forming surfaces 31 and 41 are engaged with each other to form a molding space 50, and a pair of open / fixed molds 30 and 40 formed therein with cooling holes along the molding surfaces 31 and 41; A nozzle (60) for supplying an injection solution of the substrate (10) to the molding space (50); In the molding apparatus composed of a clamp 70 for supplying the skin material 20 to the base 10 of the fixed mold 40, When forming the molding space 50 of the open / fixed mold 30, 40, which is a pair, the skin L 20 of the step B is greater than the gap L1 of the planar part A. Forming device wider by the thickness (t) of the interior material molding apparatus for a vehicle interior, characterized in that the substrate injection liquid is moved in volume during the bonding process.