JPS5896530A - Manufacture of panel member of foamed resin - Google Patents

Abstract

PURPOSE:To form a panel of different resin parts having different foaming rates, by charging resin raw liquids having different foaming rates into divisions formed on the bottom surface of a bottom force, closing the mold, and allowing the resin raw liquids to foam. CONSTITUTION:Ridges 4 are formed on the inner bottom surface 2a of the bottom force 2 so that the divisions are arranged in a desired pattern. An unfoamed resin raw liquid 6 having a low foaming rate is injected from nozzles 5 into the divisions surrounded by the ridges 4, while an unfoamed resin raw liquid 8 having a high foaming rate is injected from nozzles 7 into the remaining divisions, then the top force 1 and the bottom force 2 are closed, and the resin raw liquids 6, 8 are allowed to foam and to fill a cavity 3 with them. Then the lower part of the panel member (the reference numeral 6' indicates parts where foaming rate is low, whereas the reference numeral 8' indicates parts where foaming rate is high) is cut along the line a-a and is removed to obtain the desired panel of the foamed resin.

Description

[Detailed description of the invention]

The invention relates to a method for manufacturing a panel member made of foamed 411@ for use in a panel acoustic device, for example, in which the σ1 panel member itself, such as a vehicle interior panel, is used as a sound-diaphragm. Conventional vehicle sound output systems that use normal speaker units have the disadvantages of generally insufficient reproduction of low-frequency sound due to installation space limitations, and the speaker unit occupying a large M space. be. Therefore, the applicant of the present invention first investigated various panel members used in the σ]% portion of the vehicle, such as the Lavercellier electric shift. Acoustic MS drivers are installed on door trims, door inner panels, head linings, etc., and the panel members themselves act as diaphragms.

[We proposed a vehicle audio system that can be used. According to this, it is small and does not take up space inside the car, and can also cover a large space, making it possible to reproduce low frequency sounds comparable to large-diameter speakers. In Cl71-5 vehicle audio equipment, the panel members are foamed urethane or foamed steel. - Foamed resin materials such as rubber have a 4-star rating in terms of sound quality and performance. More preferably, only the S moving part σ1 has an appropriate density or foaming ratio according to the acoustic characteristics, and the non-stratifying part has a low foaming ratio to ensure rigidity. When installing multiple ms drivers with one frequency band divided into the same panel member, bass lIl! It has been proposed that the moving parts have a relatively high foaming rate and the medium and high tm vibration parts have a relatively low foaming rate to provide sound temporality corresponding to each. However, conventionally, in order to mold a panel member having a plurality of expansion ratios M, a plurality of foam molding steps using a plurality of molds are required, which has disadvantages such as increased cost. On the other hand, by partially changing the mold temperature,
- In one case, multiple foaming ratios are applied in the foam molding process. The boundaries between each part become vague, and it is impossible to set the foaming ratio of each part to the correct value. This also applies to the case of molding a panel member having multiple types of foaming ratio parts made of different materials.This invention was made in view of the above-mentioned current situation. It is an object of the present invention to provide a method for manufacturing a foamed panel member of several millimeters in size, in which the seed portion of the seed foam can be accurately improved in - times of the foam molding process. That is, I of the foamed resin cleft panel member according to the invention
The llll method has a panel-shaped cavity and an r! For E1i, a bottom-shaped mold in which protrusions are formed so as to divide the inner IjE surface into a plurality of sections is used, and each section of the lower mold is filled with multiple types of wood/foaming resin of different materials or foaming ratios. After injecting each of Kaihara Jun and adding a small amount of upper fJIi to this lower mold, foam it in the above capacity. The special feature of this product is that it is made by molding a few ounces of foamed resin into a single panel. Hereinafter, specific embodiments of the present invention will be described in detail based on the drawings. Incidentally, the following example of σ1 is the above-mentioned panel-type vehicle sound-! Rear parcel shelf KJ provided for equipment
In this example, it has a high foaming rate part that becomes a low range moving part and a low foaming ratio part that becomes a middle and high sound *S moving part. First, let me explain the mold used for foam molding K11lt.This molded keyaki is as shown in Figure 1.2. A rear parcel shelf-like cavity S is formed between the upper mold 1 and the lower mold 2. Compared to the desired product shape, this cavity S corresponds to the storage part of the unfoamed oji paste stock solution, and its depth is enlarged, that is, the lower a! 2
The round base 2& is covered with cedar bark two steps deep. And this lower ff112 1i1tfi 2 a Kha. Along the boundary between the desired high expansion rate area and low expansion rate area,
Projections 4 are formed to define the inner nuclear bottom surface 2a. In order to clearly define the boundaries of each part of the molded product, this protrusion 4 preferably has a triangular cross section, for example, and is preferably as thin as possible Vh. Figure S shows the foaming FIt performed using the above-mentioned mold.
This shows the process of forming the shape, and to explain it according to the work procedure, first, the lower mold 2 is divided by four protrusions 4 as shown below.
Inside! E side 2ae11 Each part is unfoamed as shown in Figure 1A *l
Inject the stock solution. Here, a predetermined amount of unfoamed ml stock solution 6 lined with low foaming ratio KelI4 is injected from the nozzle 5 into the pair of left and right parts surrounded by the protrusions 4, and the remaining part is filled with waste. A predetermined amount of unfoamed stock solution 8 with a high foaming ratio of KIA41 is injected from Lua. Then, as shown in FIG. B, the upper mold 1 is closed, and in this state, the undiluted fat solution 6.8 is foamed. At this time, since each IJF fat stock solution 6.8 is prevented from mixing with each other by the protrusions 4, each foams at the desired foaming ratio, and the foaming of each part proceeds almost simultaneously.
while forming an almost perpendicular boundary surface. Each part is foam-molded in a continuous form. After completing the foaming process described in E, the upper mold 1. When taken out from the lower mold 2, as shown in Figure CK, there is a panel-shaped member that forms the low foaming ratio part 6' and the high foaming ratio part B'. It is desired to cut and remove all as shown f) Rear parcel shelf 9
is completed (Fig. D), and if traces of the above-mentioned protrusions 4ka remain, there is no need to cut the lower part as described above. Figure 4 shows a dual-use acoustic attack panel ALIL using the capacitor shell 9 formed by the method described above. A 1N7Jl recording driver 1s for low frequency range reproduction is attached to the center of the high foaming multiplier portion 8', and a 7JOI recording driver 1s for medium and high frequency range reproduction is fixed to the low foaming multiplier portion 6'. Drivers 14 are respectively arranged to obtain reproduction sound from the rear parcel shelf 9 itself as a photographic recommendation board. Above, an embodiment has been described in which the present invention is applied to a rear parcel shelf that is used in a panel-type vehicle sound system.
This invention is not limited to this, and can of course be applied to various panel members of flg, and can also be applied to the same panel member by providing sections with different foaming heights in multiple tanks. It can also be applied to the case where a foamed part with a diameter of 1 liter and a different material is removed. As is clear from the following explanation, according to the method for manufacturing a foamed bond panel member according to the present invention, a panel member having multiple types of foamed *g* portions having different materials or foaming ratios is processed - times. It can be molded in a foam molding process, and the working time σ] can be shortened and costs can be reduced. In addition, the boundaries of each part (σ) can be clearly formed at predetermined positions, and a uniform product can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a mold used in the manufacturing method according to the present invention, Fig. 2 is a cross-sectional view thereof, Fig. 3 is an explanatory diagram of the manufacturing method f1 step according to the present invention, and Fig. 4 is a diagram of the same. FIG. 2 is a sectional view showing an example of the use of the capacitor shell 7 obtained by the method.啼...upper layer, 2...lower@,, 5...cavity,
4...Protrusions, 6...Unfoamed** stock solution with low foaming ratio,
8... High foaming double height V unfoamed 1w stock solution, 9... Rear parcel shelf. Figure 1 Figure 2 (B) (D) Figure 3

Claims (1)

[Claims] Il+ has a panel-like σ1 cavity. A mold is used in which the inner bottom surface of the lower mold is made of cedar bark with protrusions so as to divide the inner bottom surface into a plurality of sections. Several types of foamed bond solution with different materials or foaming ratios are injected into each section of the lower mold, and after the upper mold is closed to the lower mold, foaming is performed in the cavity. A method for manufacturing a panel member made of foamed steel, characterized by integrally molding foamed m1it into a single panel shape.