JP4462924B2 - Manufacturing method of floor raising material for automobile - Google Patents

Description

  The present invention relates to a method for manufacturing an automobile floor raising material for setting a floor surface to a required height by being arranged on a floor pan of an automobile.

2. Description of the Related Art As an automobile floor raising material for setting a floor surface to a required height by being arranged on a floor pan of an automobile, a material for raising the floor surface by being interposed between a floor pan and a carpet is known. This floor raising material is laminated on the floor pan side of the core material with a heat-insulated material such as range felt trimmed in the same shape with a foamed resin material with an expansion ratio of 20 to 45 times as the core material. (See JP 2001-347872 A). Further, a raising material made of hard foamed plastic, in which an impact absorbing material such as a honeycomb structure is integrally fitted, is also known (see Japanese Patent Application Laid-Open No. 2003-118460).
JP 2001-347872 A JP 2003-118460 A

  In the floor raising material described in JP-A-2001-347872 described above, an injection mold used for injection molding of the core material is expensive, and man-hours for laminating the heat insulating material on the core material are increased. In particular, many of them are light in weight and have high rigidity and sound insulation properties, and the molding process is complicated and complicated. Moreover, in what was described in the above-mentioned Unexamined-Japanese-Patent No. 2003-118460, since it did not have a hollow structure, it was inferior to sound insulation.

The present invention has been made in view of the above-described problems of the prior art, and a plurality of groove-shaped ribs recessed in a groove shape toward the back wall are formed on the front wall substantially in parallel. Is formed with a conical rib recessed in a substantially conical shape toward the front wall side at a portion facing the groove-shaped rib, and the top wall of each conical rib and the tip of the groove-shaped rib serve as a welded portion. by blowing a car floor elevating member which is integrated form, it is an object of Rukoto give a lightweight yet has a high rigidity and low-cost automobile floor raising material.

In order to achieve the above object, a method for producing an automobile floor raising material according to claim 1 of the present invention comprises a hollow double wall structure automobile floor raising material having a front wall and a back wall opposed to each other at an interval. One mold having a rib-forming portion projecting in a plate shape for forming a plurality of groove-shaped ribs recessed in a groove shape on the front wall side of a floor raising material for an automobile, and an automobile Opening a split mold including the other mold having a substantially cone-shaped rib forming portion for forming a plurality of conical ribs recessed in a substantially conical shape on the back wall side of the floor raising material. The molten parison is suspended between the divided molds, and the mold is clamped so that the tip of the rib forming part of one mold faces the tip of the rib forming part of the other mold. , By blowing a pressurized fluid into the parison, Together inflate the parison along the Activity, a groove-like ribs and conical ribs and welding together, substantially parallel with a plurality of groove-like rib recessed groove shape toward the rear wall to the front wall And a conical rib that is recessed in a substantially conical shape toward the front wall side is formed in a portion facing the groove-shaped rib on the back wall, and the top wall of each conical rib and the tip of the groove-shaped rib Is characterized by blow-molding an automotive floor raising material integrated with a welded portion .

  According to a second aspect of the present invention, there is provided a method for manufacturing an automotive floor raising material according to the first aspect, wherein the parison is arranged so that burrs are formed all around the pinch-off forming portion of the split mold. It is a feature.

  According to a third aspect of the present invention, there is provided a method for producing a floor raising material for automobiles according to the first or second aspect, wherein the height of the plate-like rib forming portion protruding from the cavity surface of one mold and the other metal mold are used. The total height of the substantially conical rib forming portion protruding from the cavity surface of the mold is 100 mm or less.

According to a fourth aspect of the present invention, there is provided a method for manufacturing an automotive floor raising material according to the first, second, or third aspect, wherein a plurality of conical ribs are staggered between adjacent rows in the longitudinal direction of the groove-like ribs. It is characterized by being arranged in a shape .

According to the present invention, the front wall is formed with a plurality of groove-shaped ribs that are recessed in a groove shape toward the back wall, and the back wall faces the front wall side at a portion facing the groove-shaped rib. A conical rib recessed in a substantially conical shape is formed, and an automotive floor raising material in which the top wall of each conical rib and the tip of the groove-like rib are integrated to form a weld is blow-molded. As a result, it is possible to obtain an automotive floor raising material that is lightweight , has high rigidity, and is inexpensive.

  1 is a perspective view showing a partially raised automobile floor raising material according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the same, and FIG. 3 is an illustration of the automobile floor raising material shown in FIGS. FIG. 4 is a partial cross-sectional view showing a blow-molded state, and FIG. 4 is a partial cross-sectional view showing a blow-molded state after clamping from the state of FIG.

  1 and 2, a floor raising material 1 is a hollow double wall structure made of a thermoplastic resin and integrally formed by blow molding, and has a hollow portion 19 and is opposed to a front wall 2 with a space therebetween. And a back wall 3, and side walls 4 are connected to the periphery of the front wall 2 and the back wall 3.

  A plurality of groove-shaped ribs 5 that are recessed in a groove shape toward the back wall 3 are formed in the front wall 2 substantially in parallel, and there are gaps between the longitudinal ends of each groove-shaped rib 5 and the side walls 4. Is provided.

  On the other hand, conical ribs 6 that are recessed in a substantially conical shape toward the front wall 2 for each groove-like rib 5 are formed on the back wall 3 at portions facing each groove-like rib 5. The top wall of the rib 6 and the tip of the groove rib 5 are integrated as a welded portion 7. The plurality of conical ribs 6 are alternately arranged between adjacent rows in the longitudinal direction of the groove-like ribs 5.

  The floor raising material 1 is made of a thermoplastic resin such as an ABS resin, a modified polyphenylene oxide resin, a polycarbonate resin, a polyamide resin, or a polypropylene resin.

  The floor raising material 1 is blow-molded as shown in FIGS. That is, the split mold is composed of one mold 8 and the other mold 9, and 10 and 10 are cavities. 11 is a groove-like rib forming part, 12 is a conical rib forming part, 13 is an extrusion head, and 14 is a parison. As shown in FIG. 3, a parison 14 is suspended between one open mold 8 and the other mold 9 so that burrs are formed all around the pinch-off forming portion of the split mold, and is shown in FIG. Thus, the mold 18 is such that the tip 18 of the groove-shaped rib forming part 11 provided on one mold 8 and the tip 18 of the conical rib forming part 12 provided on the other mold 9 face each other. Fastened and expanded along the cavities 10, 10, the groove rib 4 on the front wall side and the substantially conical rib 5 on the back wall side are integrally welded, and blow molding is performed in FIGS. The floor raising body 1 shown is obtained. In the blow molding, the parison 14 is arranged so that burrs are formed on the entire circumference of the pinch-off portion 17 of the split mold composed of one mold 8 and the other mold 9.

The total height of the height of the plate-like rib forming portion 11 projecting from the cavity 10 surface of one mold 8 and the height of the substantially conical rib forming portion 11 projecting from the cavity 10 surface of the other mold 9 of not more than 100mm or less. Even if the parison 14 is extended by the groove-like rib forming portion 11 and the conical rib forming portion 12 by blow molding the floor raising material with the above configuration, the floor raising material having a thickness of about 100 mm is preferably used. It can be formed, and it can be prevented that the parison is broken in the blow molding process or the tip portion of the rib is thin and the rigidity of the floor raising material is lowered.

  5 is a perspective view showing a partially raised automobile floor raising material according to another embodiment of the present invention, FIG. 6 is a sectional view of the same, and FIG. 7 is an automotive floor raising material shown in FIGS. FIG. 8 is a partial cross-sectional view showing a blow-molded state after clamping from the state of FIG. 3.

  As shown in FIGS. 5 and 6, in this embodiment, a plurality of groove-like ribs 5 that are recessed in a groove shape toward the back wall 3 are formed on the front wall 2 substantially in parallel. 3, a plurality of groove-like ribs 15 recessed toward the front wall are formed in a direction intersecting with the groove-like rib 5 on the surface wall 2 side, and the groove-like rib 5 and the groove-like rib 15 intersect. The parts to be integrated are integrated by the welded portions 7 welded to each other. Other configurations are the same as those shown in FIGS.

The floor raising material 1 shown in FIGS. 5 and 6 is blow-molded as shown in FIGS. 7 and 8. That is, one mold 8 is provided with a groove-like rib forming part 11, and the other mold 9 is provided with a groove-like rib forming part 16. The groove-like rib forming part 11 is a groove on the front wall 2 side. The groove-like rib forming portion 16 of the other mold 9 is for forming the groove-like rib 15. The groove-like rib forming part 11 of one mold 8 and the groove-like rib forming part 16 of the other mold 9 are provided with a total height of 50 mm or less. Other structures and molding methods are the same as those shown in FIGS.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a partially raised automobile floor raising material according to an embodiment of the present invention. It is sectional drawing same as the above. FIG. 3 is a partial cross-sectional view showing a blow molding aspect of the automotive floor raising material shown in FIGS. 1 and 2. FIG. 4 is a partial cross-sectional view showing a state in which the mold is clamped and blow-molded from the state of FIG. 3. It is a perspective view which partially fractures and shows the floor raising material for motor vehicles concerning other embodiments of the present invention. It is sectional drawing same as the above. FIG. 7 is a partial cross-sectional view showing a blow molding aspect of the automotive floor raising material shown in FIGS. 5 and 6. FIG. 8 is a partial cross-sectional view showing a state in which the mold is clamped from the state of FIG. 7 and blow-molded.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Floor raising material 2 Front wall 3 Back wall 4 Side wall 5 Grooved rib 6 Conical rib 7 Welding part 8 One metal mold | die 9 The other metal mold | die 10,10 Cavity 11 Grooved rib forming part 12 Conical rib forming part 13 Extrusion head 14 Parison 15 Grooved rib 16 Grooved rib forming portion 17 Pinch-off portion 18 Tip portion 19 Hollow portion

Claims (4)

A method for producing an automotive floor raising material having a hollow double wall structure having front and back walls facing each other at an interval,
One mold having a rib-forming portion protruding in a plate shape for forming a plurality of groove-shaped ribs recessed in a groove shape on the front wall side of the floor raising material for automobiles,
A split mold having a rib-forming portion projecting in a substantially conical shape for forming a plurality of conical ribs recessed in a substantially conical shape on the back wall side of a floor raising material for an automobile is formed. Open and
A parison melted between the divided molds,
The mold is clamped so that the tip of the rib forming part of one mold and the tip of the rib forming part of the other mold are opposed and close to each other,
By blowing pressurized fluid into the parison,
Inflating the parison along the cavity of the split mold,
Welding groove-shaped rib and conical rib together ,
The front wall is formed with a plurality of groove-shaped ribs that are recessed in a groove shape toward the back wall, and the back wall is recessed in a substantially conical shape toward the front wall at a portion facing the groove-shaped rib. An automotive floor raising material in which conical ribs are formed and the top wall of each conical rib and the tip of the groove-shaped rib form an integrated weld is blow-molded. The manufacturing method of the floor raising material for motor vehicles characterized by the above-mentioned.   2. The method for manufacturing an automotive floor raising material according to claim 1, wherein the parison is arranged so that burrs are formed all around the pinch-off forming portion of the split mold.   The total height of the height of the plate-like rib forming portion protruding from the cavity surface of one mold and the height of the substantially conical rib forming portion protruding from the cavity surface of the other die is 100 mm or less. The method for producing an automotive floor raising material according to claim 1 or 2. 4. The method for manufacturing a floor raising material for an automobile according to claim 1, wherein the plurality of conical ribs are alternately arranged between adjacent rows in the longitudinal direction of the groove-like ribs .

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