JP2666243B2 - Ironing method - Google Patents

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-like work made 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 wear such as pots, kettles and frying pans. Also, laminated materials of mild steel-titanium and mild steel-stainless steel are used as joints of different materials in ships, vehicles, electrolytic facilities and the like. Furthermore, recently, since it has excellent functionality, it is widely used as a construction material or a material for home appliances.

[0003] By the way, in a container obtained by laminating two plate materials of different materials and performing drawing, the bonding strength between the materials is low. Further, for example, there is a disadvantage that the thickness and roundness of the cylindrical side wall portion are likely to be non-uniform.

[0004] On the other hand, spinning and ironing have conventionally been used as methods for improving the shape of containers, not limited to those made of laminated materials. In normal ironing, the punching force increases as the ironing rate increases,
The work breaks at the punch shoulder. This is because the tensile strength of the material at this portion is smaller than the punch 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 easily broken. 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.
Is generated. One of the measures to prevent such breakage is to increase the tensile strength of the material at the portion corresponding to the shoulder of the punch, but this is not possible even if the material itself is restricted. is there.

[0005] As described above, since it is difficult to iron a container-like work formed by laminating dissimilar materials having different strengths in particular, a uniform shape is conventionally achieved by spinning. However, spinning has a problem in that the processing time is long and the productivity is low.

[0006]

As described above, since the conventional ironing method causes breakage, it is particularly applied to a container-like work in which a soft material is placed outside and a hard material is placed inside, and different materials are laminated. could not. In addition, spinning, which is performed in place of ironing to improve the shape, requires a long processing time and low productivity.

Accordingly, the present invention makes it possible to iron a container-like work having a soft outer side and a hard inner side laminated with different materials, thereby improving the joining strength of the different materials and making the shape uniform. The goal is to increase productivity as well.

[0008]

In order to achieve the above-mentioned object, the present invention provides a die formed by laminating different kinds of materials, into which a container-like work whose outside is soft and whose inside is hard is pressed. Using a mold having a main punch and an extrusion punch inserted into the work, when ironing a container-like work, by applying pressure to the opening side peripheral end surface of the container-like work by the extrusion punch, After ironing is performed so that the soft material is not broken, finally, the soft material is caused to flow inward so as to surround the opening-side peripheral end surface of the hard material.

[0009]

According to the present invention, in the ironing process, a pressure is applied to the opening-side peripheral end surface of the container-like work to thereby increase the pressure.
Accordingly, the punch force of the main punch inserted into the container-shaped work is reduced, and the breakage of the container-shaped work at the main punch shoulder is prevented. In addition, due to the ironing process, the outer material that is softer and more stretched eventually loses its place and is extruded.
While the punch is retracted relatively to the main punch, it flows so as to wrap around the opening-side peripheral end surface of the hard inner material. Thus, the dissimilar materials are mechanically joined, and the joining strength is improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 2 shows a container-like work 1
Is shown. This container-like 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 outside and the hard material 3 is on the inside. . The thickness of each of the soft material 2 and the hard material 3 is 1 mm. The peripheral wall of the container-like work 1 has a cylindrical shape and an inner diameter of 50 mm.

FIG. 1 shows a mold for ironing.
In the figure, 11 is a die, 12 is a guide, 13 is a main punch, and 14 is an extrusion punch. Guide 12 dice 11
The container-like work 1 is coaxially provided on the upper side, has an inner diameter slightly larger than that of the die 11, and the container-like work 1 before being ironed is inserted from above. The main punch 13 moves up and down and is inserted into the work 1 from above. The pushing 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. The ironing rate is 10% of the thickness of the soft material 2 and the hard material 3.

When ironing, the container-like 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 ironing is performed. During this time, the descending extrusion punch 14 presses against the opening-side peripheral end surface of the container-like work 1, that is, the upper end surface 1a, and applies pressure from above. By performing ironing while applying a load to the upper end surface 1a of the work 1 in this manner, the punch force of the main punch 13 on the work 1 is relatively reduced by the load . Thereby, breakage of the container-like work 1 at the shoulder of the main punch 13 can be prevented. The entire force required for ironing is the main punch
Obtained by both 13 and the extrusion punch 14. Further, with the ironing process, the outer soft material 2 having a larger elongation finally loses its place to go and flows inward so as to cover the upper end surface of the inner hard material 3 from above. Explain in more detail
Then, the pressure of the soft material 2 increases with the progress of the ironing process.
But this pressure is applied to the extrusion punch 14
Pressure is lost and the extrusion punch 14
Relative to the upper end surface of the hard material 3.
The soft material 2 enters between the dispensing punch 14. This allows
The soft material 2 and the hard material 3 are mechanically and securely joined. Of course, the shape of the container-like work 1 is also improved by the ironing process.

As described above, the upper end surface 1a of the container-like work 1
By applying ironing while applying pressure, it is possible to iron the container-like work 1 made of a different kind of laminated material having the soft material 2 on the outside and the hard material 3 on the inside. Also, at the upper end of the container-like work 1, a wrapping portion 2a for wrapping the inner hard material 3 in the outer soft material 2 is formed.
The bonding strength between the soft material 2 and the hard material 3 is improved. In addition, the processing time can be significantly reduced as compared with the conventional spinning processing, and the productivity is remarkably improved.

It should be noted that 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 aluminum and stainless steel in the above embodiment. Further, the shape, plate thickness, and the like of the container-like work are not limited to those of the above-described embodiment.

[0015] For example, when a cooking wear maker intends to manufacture a container made of a different kind of laminated material, conventionally, the different kind of laminated material uses a standardized flat plate-shaped commercially available product, which is drawn and processed. However, with the improved ironing as described above, it is possible to select an arbitrary material and a desired thickness of the material to be laminated from the stage of drawing, thereby reducing the material cost.

[0016]

According to the present invention, when ironing a container-like work which is made by laminating different kinds of materials and has a soft outside and a hard inside, an extruding punch is formed on a peripheral end surface on the opening side of the container-like work. the added pressure, so preventing breakage of the soft material in the main punch shoulder portion to be inserted into the container-shaped workpiece, soft outer and ironing with respect to the container-like workpiece formed by laminating different materials to the inside hard The ironing process can improve the shape of the container-like work. In addition, since the outer soft material wraps around the opening-side peripheral surface of the hard inner material, the joining strength of different materials is improved. Further, productivity is remarkably improved as compared with the conventional spinning process.

[Brief description of the drawings]

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

FIGS. 2A and 2B are cross-sectional views of the same container-like work, in which FIG. 2A shows a state before ironing, and FIG. 2B shows a state after ironing.

FIGS. 3A and 3B are cross-sectional views of a container-like work showing the problems of conventional ironing, in which FIG. 3A shows a state before ironing and FIG. 3B shows a state after ironing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container-like work 1a Upper end surface (opening side peripheral end surface) 2 Soft material 3 Hard material 11 Dice 13 Main punch 14 Extrusion punch

Claims (1)

(57) [Claims] 1. A die for laminating dissimilar materials, into which a container-like work whose outside is soft and whose inside is hard is pressed, a main punch inserted into the container-like work, and an extrusion punch. Using a mold, when ironing the container-like work, after applying pressure by the extrusion punch to the opening side peripheral end surface of the container-like work, after ironing to prevent the soft material from breaking, An ironing method characterized by finally flowing a soft material inward so as to wrap around the opening-side peripheral end surface of the hard material.