JPH0550172A - Manufacture of ring material - Google Patents

Abstract

PURPOSE:To extremely raise the productivity at the time of manufacturing a ring material by manufacturing a bar stock subjected to butt welding by only cutting it from one piece of slab stock without manufacturing it by one piece each by rolling. CONSTITUTION:A steel plate stock 1 subjected to rolling to prescribed thickness is formed a long-sized bar material 2 by cutting it by prescribed width (w) in its longitudinal direction, and subsequently, the long-sized bar material is subjected to butt welding by both its end faces and subjected to ring working, by which a ring material is manufactured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a ring material, and more particularly to a method for manufacturing a ring material which can simplify the manufacturing process and can significantly shorten the time required for the manufacturing.

[0002]

2. Description of the Related Art Conventionally, when manufacturing a steel ring material having a large diameter, a large disk having a predetermined diameter and thickness is manufactured, and the center portion of the disk is die-cut to form a ring material. After that, a method of shaping the ring material by applying it to a ring rolling mill is generally performed.

However, this method has a very poor yield because it punches out the central portion. Therefore, recently, a long rod having a predetermined cross-sectional shape is used as a raw material, and this rod is bent into a ring shape, but its both end faces are abutted, and after welding by a method such as flash butt welding, it is necessary. According to the above, a method of shaping with a ring rolling mill has been proposed (Japanese Patent Application No. 2-33671).
No. 2).

[0004]

By the way, when manufacturing a ring material by the above-mentioned end face butt welding, it is necessary to prepare a long rod material used for the ring material. For that purpose, it is necessary to forge the melted ingot and then roll-roll the forged product to roll it into a desired sectional shape.

Usually, since the cross-sectional shape of the bar material used is a small rectangular shape, the above-mentioned rolling process is carried out by a plurality of hot rolling processes, for example, heating-coarse rolling-cooling-defecting-heating.
Finish rolling-It is necessary to take cooling. In this way, in the process until the bar is manufactured, multiple rolling steps must be taken, and since heating is required for each rolling, the equipment cost rises and at the same time, the bar with the final cross-sectional shape is required. The time required to obtain the material also increases.

That is, there are problems that the productivity is low and the delivery time of the product is long. An object of the present invention is to provide a method for manufacturing a ring material, which solves the above-mentioned problems and which can reduce the time required for manufacturing with extremely high productivity.

[0007]

In order to achieve the above-mentioned object, in the present invention, a flat metal plate which is rolled to a predetermined thickness is cut into a long bar in the longitudinal direction to form a long bar. Then, a method for producing a ring material is provided, characterized in that the long bar is butt-welded at both end surfaces thereof and subjected to ring processing.

[0008]

In the method of the present invention, the thickness of the bar obtained after cutting is constant with the thickness of the flat metal plate. Further, the width of the rod can be arbitrarily selected in relation to the sectional shape of the ring to be manufactured. Since each bar is a material that has already been subjected to the desired rolling at the stage of a flat metal plate, there is no need to perform multiple rolling steps as in the past, the process is simplified and the delivery time is shortened. Is possible. The method of the present invention can be applied to all metals such as non-ferrous alloys as well as steel materials.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings. In the method of the present invention, first, as shown in FIG. 1, a flat steel plate material 1 of a predetermined steel type rolled by a known method.
Is prepared as a material. In this case, the thickness t, the width w, and the length 1 of the flat steel plate material 1 are appropriately determined by the relationship between the cross-sectional shape of the ring material to be manufactured and the cylinder length.

Next, as shown in FIG. 2, the flat steel plate material 1 is cut in its longitudinal direction and processed into a long bar material 2 having a width w, a thickness t and a length l. Therefore, the thickness and the length of the obtained bar 2 are equal to the thickness and the length of the steel flat plate 1 shown in FIG. Although not particularly limited, the steel flat plate material 1 may be cut using, for example, a vertical saw or a plasma cutting machine. Further, cutting by jetting water, cutting by an electron beam, laser cutting, gas cutting and the like can also be applied.

It is preferable to use the plasma cutting machine in that the flat plate material 1 can be cut straight in the longitudinal direction, the cutting speed is high, and large-scale equipment is not required. After that, the bar 2 is bent into a ring shape as shown in FIG. 3, both end surfaces 2a and 2b of the bar 2 are butted as shown in FIG.
A and 2b are processed into the ring 3 by, for example, flash butt welding.

Thereafter, if necessary, the ring 3 may be subjected to a ring rolling mill and rolled into a desired sectional shape. According to the method of the present invention, the flat plate material 4 having a modified cross section as shown in FIG.
If this is cut from points A, B, and C in the figure, a long bar with a cross section of a different shape can be separated. It can also be manufactured.

[0013]

As is clear from the above description, according to the method of the present invention, a bar member having a desired cross section is cut from a pre-rolled metal flat plate member, and this is butt-welded to manufacture a ring. As compared with the conventional case where a bar material having a desired cross section corresponding to the ring shape is rolled, it is possible to shorten the steps required until the ring processing,
Rings having different width dimensions can be manufactured by cutting a bar material having a desired width from a pre-rolled flat plate material without rolling each time, and the productivity of the ring processing can be improved. The effect is particularly remarkable for small lot orders.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a steel flat plate material used in a method of the present invention.

FIG. 2 is a partially cutaway perspective view showing a state in which a long bar is cut from a flat steel plate.

FIG. 3 is a perspective view showing a state where the cut long bar material is bent into a ring shape.

FIG. 4 is a perspective view showing a ring formed by welding both end surfaces of a long bar.

FIG. 5 is a cross-sectional view showing another example of a flat steel plate material.

[Explanation of symbols]

 1 Steel flat plate 2 Long bar 2a, 2b End face of long bar 3 Ring 4 Flat plate with cross section 4a Hollow part

Claims (3)

[Claims] 1. A ring-shaped flat bar material, which is rolled to a predetermined thickness, is cut into a long bar in a longitudinal direction thereof with a predetermined width, and then the long bar is butt-welded at both end faces thereof. A method for manufacturing a ring material, which comprises processing. 2. The method for manufacturing a ring material according to claim 1, wherein the cutting is performed using a vertical saw or a plasma cutting machine. 3. The method for manufacturing a ring material according to claim 1, wherein the butt welding is flash butt welding.