JPH06297050A - Ironing method - Google Patents

Abstract

PURPOSE:To improve the joining strength and to uniformly make the dimensional property by applying the pressure to the peripheral end surface of the opening side of a vessel like work laminated by making the outside soft and the inside hard, and ironing it. CONSTITUTION:A vessel like work 1 is formed by laminating a soft material 2 of an Al, etc., on the outside and a hard material 3 of a stainless steel, etc., in the inside. This vessel like work 1 is inserted inside a guide 12, and a main punch 3 is descended. The work 1 is pressed in a die 11 and processed with ironing. During the time, a descending extruding punch 14 presses on an upper end surface 1a of the work 1, and the pressure is applied from the upper side. Due to this working, the punching force on the shoulder part of a main punch 13 is made small, and the break of the work 1 on the shoulder part of the main punch 13 can be prevented. Further, following ironing, the soft material 2 of the outside is made to flow to the inside so as to cover the upper end surface of the hard material 3 of the inside, and the soft material 2 and the hard material 3 are mechanically and surely joined.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for ironing a container-shaped work formed by laminating different kinds of materials.

[0002]

2. Description of the Related Art Laminated materials such as aluminum-copper and aluminum-stainless steel are used for cooking ware such as pots, kettles and frying pans. Further, the laminated materials of mild steel-titanium and mild steel-stainless steel are used as joints of dissimilar materials in ships, vehicles, electrolytic equipment and the like. Further, recently, due to its excellent functionality, it has been widely used as a construction material and a material for home appliances.

By the way, in a container obtained by laminating two plate materials made of different materials and subjecting to drawing processing, the bonding strength between the materials is weak. Further, there are drawbacks such that the plate thickness of the cylindrical side wall portion and the roundness are likely to be non-uniform.

On the other hand, conventionally, there is a spinning process or an ironing process as a method for improving the shape of a container, not limited to the one made of a laminated material. In normal ironing, punching force increases with increasing ironing rate,
The work breaks at the punch shoulder. This is because the tensile strength of the material at this portion is smaller than the punching force. In particular, when the material is a heterogeneous laminated material and the outside is a soft material and the inside is a hard material, a larger load is applied to the outside, so that the material is more likely to break. One example is shown in FIG. In FIG. 3, the work 1 has an outer soft material 2 made of aluminum and an inner hard material 3 made of stainless steel, and has a fracture 4 as shown in FIG.
Cause One of the measures to prevent such breakage is to increase the tensile strength of the material at the part corresponding to the punch shoulder, but this is impossible if there is a restriction on the material itself. is there.

As described above, since the container-like work made by laminating different materials having different strengths is particularly difficult to be ironed, the conventional work has been to make the shape uniform by spinning. However, the spinning process has a problem that it takes a long processing time and productivity is low.

[0006]

As described above, since the conventional ironing method causes breakage, it is particularly applied to a container-shaped work in which different materials are laminated with the soft material on the outside and the hard material on the inside. could not. Further, in order to improve the shape property, the spinning process performed instead of the ironing process takes a long processing time and has a problem of low productivity.

Therefore, the present invention enables ironing of a container-shaped work in which different materials are laminated by making the outside soft and the inside hard, thereby improving the joining strength of different materials and making the shape uniform. The goal is to improve productivity as well.

[0008]

In order to achieve the above-mentioned object, the present invention provides a method of ironing a container-shaped work, which is formed by laminating different kinds of materials and has a soft outer side and a hard inner side. The pressure is applied to the peripheral end surface of the work piece on the opening side.

[0009]

In the present invention, by applying pressure to the peripheral edge surface of the container-shaped work on the opening side during ironing, the punching force is reduced and breakage of the container-shaped work at the punch shoulder is prevented. Further, as the ironing process is performed, the outer material that is soft and has a larger elongation finally loses its place to flow so as to wrap around the opening-side peripheral end surface of the hard inner material. In this way, dissimilar materials are mechanically joined and the joining strength is improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 2 shows a container-shaped work 1.
Is shown. The container-shaped work 1 is obtained by laminating and drawing, and is formed by laminating a soft material 2 made of aluminum and a hard material 3 made of stainless steel. The soft material 2 is on the outer side and the hard material 3 is on the inner side. . Each of the soft material 2 and the hard material 3 has a plate thickness of 1 mm. The peripheral wall of the container-shaped work 1 is cylindrical and has an inner diameter of 50 mm.

FIG. 1 shows a die for ironing.
In the figure, 11 is a die, 12 is a guide, 13 is a punch,
14 is an extrusion punch. The guide 12 is coaxially provided on the die 11, has an inner diameter slightly larger than that of the die 11, and the container-shaped work 1 before ironing is inserted from above. The main punch 13 moves up and down and is inserted into the work 1 from above. The extrusion punch 14 moves up and down independently of the main punch 13 and is inserted between the guide 12 and the main punch 13 from above. Ironing rate is 2 for soft material
And 10% of the plate thickness of the hard material 3.

In ironing, the container-shaped work 1 is inserted into the guide 12 and the main punch 13 is lowered. Along with this, the work 1 is pushed into the die 11 and ironed. In the meantime, the descending extrusion punch 14 presses against the opening side peripheral end surface of the container-shaped work 1, that is, the upper end surface 1a, and applies pressure from above. By performing the ironing process while applying a load to the upper end surface 1a of the work 1, the punching force of the main punch 13 is reduced. As a result, the container-shaped work 1 on the shoulder of the main punch 13
Can be prevented from breaking. In addition, the outer soft material 2 having a larger elongation finally loses its place due to the ironing process,
It flows inward so as to cover the upper end surface of the inner hard material 3 from above. Thereby, the soft material 2 and the hard material 3 are mechanically and reliably joined. Of course, the ironing also improves the shape of the container-shaped work 1.

As described above, the upper end surface 1a of the container-shaped work 1
By performing ironing while applying pressure to the container 1, it is possible to perform ironing of the container-shaped work 1 made of different kinds of laminated material having the soft material 2 on the outer side and the hard material 3 on the inner side. Further, since the wrapping portion 2a for wrapping the inner hard material 3 in the outer soft material 2 is formed at the upper end of the container-shaped work 1,
The bonding strength between the soft material 2 and the hard material 3 is improved. Further, compared with the conventional spinning process, the processing time can be greatly reduced and the productivity is remarkably improved.

The present invention is not limited to the above embodiment, and various modifications can be made. For example,
The material of the work is not limited to the aluminum or stainless steel of the above-mentioned embodiment. Further, the shape and plate thickness of the container-shaped work are not limited to those in the above embodiment.

[0015] For example, when a cookware maker intends to manufacture a container made of different kinds of laminated materials, conventionally, the different kinds of laminated materials are standardized flat plate commercial products, which are subjected to a drawing process. However, by the improved ironing process as described above, it is possible to select any material and plate thickness for the material to be laminated from the drawing stage, and the material cost can be reduced.

[0016]

According to the present invention, when ironing a container-shaped work, which is made by laminating different kinds of materials and is soft on the outside and hard on the inside, a pressure is applied to the opening-side peripheral end surface of the container-shaped work. As a result, the punching force can be reduced, and the soft material at the punch shoulder can be prevented from being broken. Therefore, ironing can be performed on a container-like work in which different materials are stacked by making the outside soft and the inside hard. Become. By this ironing process, the shape of the container-like work can be improved, and in particular, the outer soft material envelops the opening-side peripheral end surface of the hard inner material, thereby improving the bonding strength of different materials. Further, the productivity is remarkably improved as compared with the conventional spinning process.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a die for ironing, showing an embodiment of the present invention.

FIG. 2 is a sectional view of the same container-shaped work, showing (a) before ironing and (b) after ironing.

FIG. 3 is a cross-sectional view of a container-shaped work showing a problem of conventional ironing, (a) before ironing, and (b) after ironing.

[Explanation of symbols]

 1 Container-shaped work 1a Upper end surface (opening side peripheral end surface) 2 Soft material 3 Hard material

Claims (1)

[Claims] 1. When ironing a container-shaped work, which is formed by laminating different kinds of materials and has a soft outer side and a hard inner side, a pressure is applied to an opening side peripheral end surface of the container-shaped work. Squeeze ironing method.