JPH0810860A - Production of aluminum-made roll-bond panel - Google Patents

Abstract

PURPOSE:To enable the formation into an optional shape by clamping the sur rounding of an aluminum-made roll-bond panel before pipe-expanding and execut ing the pipe-expansion work in the clamping condition after forming by an opposite hydraulic forming method. CONSTITUTION:The aluminum-made roll-bond panel material 1 is laid on a lower die 3 incorporated with liquid 2. Both ends of the panel material 1 is clamped with the die 3 and a blank holder 4, and a punch 5 is lowered. The panel material 1 is applied with the pressure of the punch 5 from the upper side and the pressure of the liquid 2 from the lower side and formed along the shape of the punch 5. The punch 5 is further lowered to execute the deep drawing to the panel 1. The pipe expansion work is executed to the panel material 1 by feeding the air having higher pressure than the pressure of the liquid 2 in the clamping condition of the panel 1. This method can be executed by manufacturing only one side of the die, and the die cost can be saved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a roll bond panel made of aluminum suitable for a floor panel of an automobile, an inner plate of an automobile such as an instrument, a structural member and the like.

[0002]

2. Description of the Related Art Conventionally, press-formed steel plates have been used for automobile floor panels, automobile inner plates such as instruments, and structural members. For example, damping steel plates are used for automobile instruments, and plated steel plates are used for floor panels.
Conventional automobile inner plates using these press-formed steel plates,
Although the structural member is excellent in strength, it is heavy in weight and has a problem of rust when it is used for an automobile floor panel or the like.

Recent environmental problems such as automobiles (fuel consumption,
Considering recycling), there is an urgent need to reduce the weight of automobiles, and in particular, it is required to reduce the unsprung weight.
For that purpose, it is conceivable to use lightweight aluminum or aluminum alloy (hereinafter, simply referred to as aluminum), but aluminum has a problem that its strength is low even if it is lightweight. Therefore, in order to improve its strength, a plurality of layers of aluminum, for example, three layers or a honeycomb panel,
Although it is lightweight and has high strength, it is possible to process these aluminum materials with multiple layers with a large curvature of, for example, 5000 R or more, but basically it changes the panel configuration and it is difficult to process curved surfaces. There was a big limitation.

An object of the present invention is to solve the above-mentioned conventional problems and to provide a method for manufacturing a roll-bonded panel made of aluminum which is light in weight and has a multi-layer structure to enhance strength.

[0005]

According to the present invention, a roll-bonded panel material made of aluminum before being inflated is clamped, and after being formed by a counter-hydraulic forming method, an inflated tube is processed in the clamped state. According to this, the above problems are solved.

[0006]

In the present invention, since the aluminum roll-bonded panel material is used, it is light in weight, and moreover, the one before expansion tube formed in plural layers of two layers or three layers or more is used. Processing is possible. In addition, since the opposite hydraulic molding method is used for forming the roll bond panel material, only one mold is required, the mold cost is low, and any shape having a small curvature such as a curved surface like the mold is used. Can be processed into Moreover, the aluminum material does not spring back.

For the aluminum plate of the present invention, for example, non-heat-treated material 1100, 3003 or the like, or heat-treated material 6951 or the like can be used, and the plate thickness is 1.0 to 1.
It is about 5 mm, and it has two layers as shown in Fig. 1.
(a), three-layer (b) structure or honeycomb structure is used. These panel materials are expanded so that the height of the expanded tube is about 2 to 5 mm.

As shown in FIG. 2, the molding method adopted in the present invention is a counter-hydraulic molding method. In this method,
As in (a), the aluminum roll bond panel material 1 is placed on the lower mold containing the liquid 2, both ends of the aluminum roll bond panel material 1 are clamped by the die 3 and the blank holder 4, and then, The punch 5 is lowered as shown in FIG. At this time, the pressure of the liquid 2 is applied in opposition to the pressing force of the punch 5, and the roll bond panel material 1 made of aluminum receives the pressure of the punch 5 from the upper side and the liquid pressure from the lower side. (C) by further lowering the punch 5
Deep drawing is performed as shown in FIG. In the present invention, after the counter-hydraulic molding shown in FIG. 2, the expansion tube processing is further performed while the aluminum roll bond panel material 1 is clamped. The inflating process is performed by supplying high-pressure air higher than the pressure of the liquid 2 to the circuit portion formed in advance.

[0009]

As described above, according to the present invention, it is sufficient to manufacture only one mold, which can save the cost of the mold, and can be used for the roll-bonding material having a plurality of layers, which has been considered difficult in the past. Aluminum roll bond panels that can be molded into any shape and that are lightweight, have high strength, and do not cause rust can be obtained. Therefore, if these are applied to automobile floor panels or instrument panels, the weight of automobiles will be reduced. And environmental problems such as fuel consumption and recycling can be solved.

[0010]

EXAMPLE An aluminum alloy plate having a plate thickness of 1.2 mm and a material of 1100 has a three-layer structure as shown in FIG. 1 (b) and an aluminum roll bond panel material, and a counter liquid as shown in FIG. It was processed by a pressure molding method, and then, while being clamped, high-pressure air was blown from the circuit portion and expanded to a thickness of 3.0 mm. The obtained aluminum roll bond panel was lightweight and had high strength suitable as a floor panel for an automobile having a complicated shape as shown in FIG.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view schematically showing a two-layer (a) and three-layer structure (b) of aluminum roll bond panel materials used in the present invention.

FIG. 2 is an explanatory view showing a step of a counter hydraulic forming method which is a forming method of the present invention.

FIG. 3 is a schematic explanatory view showing an example of an automobile floor panel obtained by an example of the present invention.

[Explanation of symbols]

 1 Aluminum roll bond material 2 Liquid 3 Die 4 Blank holder 5 Punch

Claims (1)

[Claims] 1. A method of manufacturing an aluminum roll bond panel molded into a predetermined shape such as a curved surface, wherein the periphery of an aluminum roll bond panel material before expansion is clamped, and after being molded by a counter-hydraulic molding method, A method for manufacturing an aluminum roll-bonded panel, which comprises subjecting a tube to expansion while being clamped.