JPH06312204A - Method for rolling annular base stock - Google Patents

Abstract

PURPOSE:To smoothly roll the surface of an annular base stock by preventing peeling of the base stock in corner parts by suppressing temp. rising in the corner parts of the annular base stock which is rolled with a ring mill. CONSTITUTION:By concentratively ejecting a water-soluble lubricant toward the corner parts of the annular base stock 3 from cooling water ejection pipes 23 which are attached to a main roll 1 with which the annular base stock 3 which is rotated in a horizontal plane is held in the radial direction and the structure parts for supporting a mandrel 2, temp. rising in the corner parts of the annular base stock 3 is suppressed. In this way, the peeling of the base stock in the corner parts of the annular base stock 3 is prevented, so it is prevented that the surface of the annular base stock is roughened by biting the peeled base stock with each roll.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to so-called ring mill rolling in which an annular material is rolled by being sandwiched by rolling rolls from two directions, a radial direction and a direction perpendicular to the radial direction. By cooling the corners by injecting a water-soluble lubricant toward the corners of the annular material whose temperature rises, it is possible to prevent material peeling due to the temperature rise of the corners, and thus the surface state of the annular material. The present invention relates to a ring mill rolling improved so as to be able to roll smoothly.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 2, a main roll 1 and a mandrel 2 which are arranged on an outer peripheral side and an inner peripheral side of an annular material 3 and sandwich the annular material in a radial direction, and a radius of the annular material 3. Using the pair of axial rolls 4 and 5 arranged on one side and the other side of the annular material 3 in the direction perpendicular to the direction and sandwiching the annular material 3 in the direction perpendicular to the radial direction, the annular material 3 is formed. There is known a hot rolling method by a so-called ring mill rolling device 10 for rolling the steel sheet from two directions, that is, the radial direction and the direction perpendicular to the radial direction. In this ring mill rolling, the annular material 3 is radially compressed by the main roll 1 and the mandrel 2 to gradually reduce the radial dimension of its cross-sectional shape, and this operation deforms in the direction perpendicular to the radial direction. The cross-sectional shape of the material is adjusted by compressing the cross-sectional shape of the material in the direction perpendicular to the radial direction by the axial rolls 4 and 5, or the operation opposite to this is repeated to form the ring-shaped material 3 into a desired cross-sectional shape. Roll to.

[0003]

However, when an annular material 3 made of a soft metal such as a copper alloy or an aluminum alloy is subjected to ring mill rolling, as shown in FIG. 1, the corners of the annular material 3 are the main roll 1 and the mandrel. A bulge B is formed along the surface of No. 2. Then, the ring-shaped material 3 rotates and the burr B becomes the axial rolls 4.5.
When it reaches, the axial rolls 4 and 5 crush the burr B and roll it so that the surface of the annular material 3 becomes flat. Accordingly, when a soft metal such as a copper alloy or an aluminum alloy is subjected to ring mill rolling, the deformation of the corners of the annular material 3 is particularly remarkable. Therefore, as shown in FIG. A region T in which the material temperature is considerably higher than that of the other region is generated. When the temperature in the region T further increases, the material in the region T peels off and is caught between the main roll 1, the mandrel 2 or the axial rolls 4 and 5 and the surface of the annular material 3. The surface of the ring-shaped material 3 has irregularities, which are irregular. Therefore, in order to make a product by using the annular material 3 having such a rough surface, the surface has to be smoothed by cutting or grinding, resulting in an increase in the number of processing steps and a decrease in the material yield of the product. Was causing the problem. Further, when the temperature of the annular material exceeds a predetermined temperature, the crystal grain size is enlarged, and the crystal structure is locally changed.

Therefore, the present invention has been made in view of the above-mentioned situation, and by suppressing the temperature rise of the corner portion of the annular material 3, the material separation at the corner portion of the annular material is prevented. An object of the present invention is to provide a ring mill rolling method capable of keeping a material surface smooth and preventing a local crystal structure of the material from changing.

[0005]

In order to solve the above-mentioned problems, a rolling method for a ring-shaped material according to claim 1 of the present invention comprises: In the method of hot rolling by sandwiching with rolling rolls from one direction, the corner portion is cooled by spraying a water-soluble lubricant toward the corner portion of the annular material.

[0006]

According to the method for rolling an annular material according to the first aspect of the present invention, since the water-soluble lubricant is sprayed toward the corners of the annular material to cool the corners, It is possible to prevent the material from peeling off at the corners of the material and to prevent changes in the crystal structure of the material at the corners.

[0007]

Embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, the same parts as those in the conventional example are designated by the same reference numerals to simplify the description.

EXAMPLE A ring mill rolling apparatus 10 of this example is similar to the conventional apparatus shown in FIG. 2, in which an annular material 3 is rotated in a horizontal plane, and a main roll 1 and a mandrel which sandwich the annular material 3 in a radial direction. 2, axial rolls 4 and 5 that sandwich the annular material 3 in the vertical direction, and a centering roll 6 that guides the rotation of the annular material 3.

The main roll 1 is rotatable about an axis parallel to the rotation axis C of the annular material 3, and the annular material 3 is rotated in a horizontal plane by a drive mechanism (not shown). The mandrel 2 is rotatable about an axis parallel to the rotation axis of the main roll 1 and is provided so as to be able to move toward and away from the main roll 1 by a pressing mechanism such as a hydraulic cylinder (not shown). There is. The annular material 3 is sandwiched between the mandrel 2 and the main roll 1 and rolled, so that the radial dimension of the sectional shape of the annular material 3 is changed.

Further, a pair of axial rolls 4 and 5 are provided in order to reduce the vertical dimension of the sectional shape of the annular material 3 or to maintain it at a constant height. The upper axial roll 4 is provided with a pressing mechanism such as a hydraulic cylinder (not shown) so that it can be moved toward and away from the lower axial roll 5. The annular material 3 is sandwiched between the upper axial roll 4 and the lower axial roll 5, and the upper axial roll 4
Is pressed toward the lower axial roll 5, the vertical dimension of the cross-sectional shape of the annular material 3 is changed.

Furthermore, a pair of centering rolls 6 are provided on the outer periphery of the annular material 3 so as to sandwich the main roll 1 in order to maintain the center of rotation of the annular material 3. The centering rolls 6 press the annular material 3 by a pressing mechanism such as a hydraulic cylinder (not shown).

Further, in this embodiment, as shown in FIG.
An injection pipe 23 for injecting a water-soluble lubricant in a concentrated manner is provided at a corner of the annular material 3. The injection pipe 2
3 is attached to a support structure portion (not shown) of the main roll 1 and the mandrel 2, and the water-soluble lubricant is directed toward the corner of the annular material 3 even if the distance between the main roll 1 and the mandrel 2 changes. It is designed to spray intensively.

Further, in the present invention, a water-soluble lubricant is used for cooling the corners of the annular material 3. In the present invention, since the tip of the injection pipe 23 is set to be thin in order to intensively inject the lubricant to the corner portion of the annular material 3 in the present invention, graphite or molybdenum disulfide that is conventionally used in mineral oil is used. This is because a lubricant containing a solid substance is not suitable like a lubricant in which the above are dispersed, and the cooling performance of the lubricant is emphasized in order to utilize the lubricant as a coolant for lowering the temperature of the material. . However, it goes without saying that the effect as a lubricant for preventing seizure and galling between the annular material 3 and each roll is also important.

[0014]

Since the present invention has the above-mentioned structure, the following excellent effects are obtained. That is, according to the method for rolling an annular material according to claim 1 of the present invention, the water-soluble lubricant is intensively injected toward the corners of the annular material. I was able to suppress the rise. As a result, it is possible to prevent the material from peeling off at the corners of the annular material and being caught between the main roll, the mandrel or the axial roll and the surface of the annular material, so that the surface of the annular material 3 is rolled while being kept smooth. Will be able to. Therefore, when processing a product from an annular material, it is not necessary to cut or grind the surface of the material to make it flat, so that the number of processing steps can be reduced and the material yield of the product can be improved. Further, since the temperature of the raw material can be controlled so as not to exceed a predetermined temperature, the crystal grains are not locally enlarged and the crystal structure is not changed, and the material characteristics can be made uniform.

[Brief description of drawings]

FIG. 1 is a partially enlarged view showing an embodiment of the present invention.

FIG. 2 is a conceptual diagram showing an entire ring mill rolling device.

[Explanation of symbols]

 10 Ring Mill Rolling Equipment 1 Main Roll 2 Mandrel 3 Annular Material 4 Upper Axial Roll 5 Lower Axial Roll 6 Centering Roll 23 Lubricant Injection Pipe

Claims (1)

[Claims] 1. A method of hot rolling by sandwiching a ring-shaped material from the radial direction and two directions perpendicular to the radial direction by rolling rolls, wherein a water-soluble lubricant is applied to the corners of the ring-shaped material. A method for rolling an annular material, characterized in that the corners are cooled by jetting.