JP2688015B2 - Coining processing 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 coining method in which a material is passed between rolls to transfer a die surface shape formed in a roll or a flat mold to the material by a pressing force.

[0002]

2. Description of the Related Art Conventionally, as a method for forming an uneven pattern on the surface of a material, a coining method using a pressing device is known. In this coining method, by using the upper and lower molds of the completely sealed type, the side of the material is restrained to limit the escape area of the meat, and the mold with the uneven portion formed on the mold surface is overlapped with the material. By pressing from the entire surface, the pattern of the uneven parts of the mold is transferred to the material. In addition to the above, a molding method using a roll has been proposed as a coining method. In this roll forming, generally, at least one roll surface of a pair of rolls is subjected to unevenness processing, and the unevenness pattern is transferred to the material by a rolling force by passing the material between the rolls. Then, a concavo-convex pattern is formed on the surface of the flat mold instead of the roll surface, and the concavo-convex pattern of the flat mold is transferred to the material surface by stacking this flat mold and the material and passing it between the rolls. Is proposed.

Also in these roll forming processes, it is necessary to restrain lateral deformation of the material in the same manner as in press forming in order to prevent dripping of a transfer pattern due to escape of meat. Therefore, a roll having a diameter sufficiently larger than that of the material is used, and the lateral deformation is restrained by bringing the roll and the material into contact with each other over a wide area.
Coining is performed by plastic deformation with little rolling deformation (deformation in the rolling direction). In order to obtain such deformation behavior, the roll diameter D is 1 with the thickness of the material being t.
It is necessary to set it to 00t or more, and it is preferable to set it to 300t or more. Among the rolling equipment for coining currently in operation, the one having a roll having a diameter of about 400 mm is the largest, and a thin plate material having a maximum of about 4 mm is used as a processing target from the above viewpoint.

[0004]

However, recently, there is a demand to similarly perform coining on a thicker material, and it is desired to realize the coining by rolling as described above. To meet this demand,
A rolling facility having a roll with a diameter larger than that of the existing facility is required, but a large facility cost is required to construct a new large rolling facility, which is a cost problem.

Further, in the coining rolling facility, as described above, the roll and the material are in contact with each other over a wide area,
A high surface pressure is required for coining, and a high load must be applied to reduce the cost of equipment and damage to the roll. Moreover, in the case of thick materials such as those mentioned above, it is necessary to make contact with a wider area in order to prevent distortion of deformation (use of a roll with a larger diameter).
Becomes necessary, and the above problem becomes more prominent. Due to these circumstances, coining a thick material has heretofore been considered to be substantially difficult.

The present invention has been made in view of the above circumstances, and provides a coining method capable of processing a material having a large plate thickness or a material having a large processing surface by using an existing rolling facility. The purpose is to do.

[0007]

To solve the above Division Shinya SUMMARY OF THE INVENTION, coining processing method of the present invention, through the material between the rolls, with the roll surface or material with the rolling force b
The mold surface shape that is formed on the flat mold surface that passes between the
In the coining method that transfers to the surface , the material thickness
Is t, the forming roll diameter is D, and the reduction width is δ, D / t is
Using rolls in the range 10-40, δ = 1.
Small reduction width in the range of 0t to 1.5t and 1-1
It is characterized in that the material is rolled at a rolling reduction within the range of 0%, and the die surface shape is transferred with a slight rolling deformation of the material.

[0008] The contact, in the initial object of the present invention, but is intended to coining a large material thickness of the thick material and machining area as an object, the present invention is not limited thereto, The present invention can be applied regardless of the plate thickness of the material or the processing area.

[0009]

According to the present invention, the contact area between the roll and the material is reduced, and lateral deformation of the material is slightly permitted during processing.
The processing load can be reduced. However, if the lateral deformation is allowed, the deformation of the material is disturbed, and as shown in FIG. 1, faithful transfer is not performed at the transfer portion, resulting in drooping deformation. Therefore, in the present invention, the sagging deformation is prevented by increasing the rolling reduction, and it is possible to perform coining on a thick material with a small load force using a roll having a comparatively small diameter.

Next, the reasons for limiting the numerical values of the present invention will be described below. Rolling width (δ): 1.0t to 1.5t By making the rolling width much smaller than the conventional one (about 2t), coining can be performed with a small rolling load using a roll having a small diameter. However, the reduction width is 1.0
If it is less than t, sufficient working strain cannot be given, and if it exceeds 1.5 t, the coining shape is likely to be broken, so the range is limited to the above range.

Roll diameter (D): 10t to 40t By using a roll having a diameter smaller than that of the conventional one (D / t> 100), a slight rolling deformation is allowed, the rolling load can be reduced, and Miniaturization is possible. However, if it is less than 10 t, the deformation of the roll becomes large and the plate thickness accuracy becomes poor. On the other hand, when it exceeds 40 tons, the rolling load becomes large, which leads to an increase in the size of rolling equipment. Further, when the roll diameter is out of the upper and lower limits, avalanche deformation is likely to occur as shown in FIG. Therefore, the roll diameter is limited to the above range.

Reduction ratio: 1 to 10% The change in plate thickness on the outlet side with respect to the plate thickness on the inlet side can be expressed by the reduction ratio. However, since the deformation in the rolling direction due to the transfer of the uneven portion also appears as a reduction in the plate thickness, the present invention shows the rolling reduction by the plate thickness change (change amount only in the rolling direction) without this. Conventionally, the rolling reduction is zero comma number%, whereas in the present invention, the drooping deformation is effectively prevented by increasing the rolling reduction. In particular, this sagging deformation can be prevented more effectively by appropriately selecting the roll diameter. However, if it is less than 1%, sufficient working strain cannot be given to the material, and if it exceeds 10%, the rolling deformation becomes too large and the coining shape collapses, so the content is limited to the above range. For the same reason, it is desirable to further limit the content to 2 to 10%.

[0013]

Embodiments of the present invention will be described below. Thickness 9
A plate-shaped Cr alloy material having a size of mm and a rectangular parallelepiped flat die are prepared, and coining is performed by the following procedure in a rolling facility having a roll having a diameter of 200 mm. An uneven portion for transfer is formed on one surface of the flat mold. The above-mentioned material is superposed on the surface of the flat mold so that the surface of the flat mold faces the concavo-convex portion, and they are integrated and supplied to a roll forming machine. The rolling reduction in the roll forming machine is set to 5%.

The material and the flat mold supplied to the roll forming machine are drawn between a pair of rolls and pressed against the mold surface of the flat mold in order from the tip of the material, and at a predetermined rolling reduction. It is plastically deformed, and a concavo-convex portion is formed on one surface thereof according to the shape of the flat mold. At this time, the material is slightly allowed to deform in the rolling direction, and can be rolled with a small processing load. The reduction width at this time is 10 mm. After the flat mold and the material have passed between the pair of rolls, the flat mold and the material are separated to obtain a product having a coining process on the surface. In this product, coining was performed well without any sagging deformation in the transfer portion. The obtained product has a plate thickness of 8 mm, of which 0.
55 mm was the reduction in plate thickness due to deformation in the rolling direction due to the transfer of the unevenness, and the reduction in plate thickness due to deformation in the rolling direction was substantially 0.45 mm.

In the above embodiment, the flat mold is arranged only on one side of the material, and the uneven portion is transferred only on one surface of the material. However, the flat mold in which various uneven portions are formed on both sides of the material. It is also possible to place coins on both sides of the material by placing them, and it is also possible to perform coining on the roll surface without the use of a flat mold. is there.

[0016]

As described above, according to the coining method of the present invention, the material is rolled with a small reduction width, and the die surface shape is transferred with a slight rolling deformation of the material. By this, coining can be performed on a material having a large plate thickness with a small load, and there is an effect that it can be applied to a thick material without increasing the equipment cost. Further, even with a material having a large processing area, coining can be performed with a small processing load, and the burden on the equipment can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a deformation behavior during coining by a roll.

FIG. 2 is a graph showing the relationship between roll diameter and sagging deformation.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-198351 (JP, A) JP-A-59-225829 (JP, A)

Claims (1)

(57) [Claims] 1. A flat type in which a material is passed between rolls , and the roll surface or material is passed between the rolls by its rolling force.
In the coining method that transfers the mold surface shape formed on the surface to the material surface , the material thickness is t
The diameter is D and the reduction width is δ, D / t is in the range of 10-40.
Using the roll in the enclosure, δ = 1.0t-1.5t
Within the range of 1-10%
A coining processing method characterized in that the material is rolled at a rolling reduction rate and the die surface shape is transferred with a slight rolling deformation of the material.