JPS6114900B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing various caliber rolls made of cast iron, adamite, cast steel, and other non-ferrous metals, including improvements in the structure around the caliber grooves and their productivity and economy. The present invention provides a novel means for forming improved caliber grooves.

Conventionally, when manufacturing caliber rolls, it is common to cut the roll material to form predetermined caliber grooves. According to this caliber groove forming means, the cutting process takes a long time and the cut portion of the roll material becomes waste material, which poses problems in terms of productivity and economy. If the roll material is cast as is, the cutting process will remove the good cast outer shell structure, and the crystalline structure will be split around the caliber grooves, and the cast internal structure will be exposed directly. The structure causes a decrease in the properties required for the caliber groove, such as wear resistance and heat cracking resistance.
This problem also occurs even when the outer shell of the roll material is plastically worked, because the excellent outer shell structure is divided and removed.

In addition, as another method for forming caliber grooves, it is also possible to perform hot press forming on the roll material to form caliber grooves, but in this case, large-scale press equipment with a large pressing force is required, and the The cutting and finishing process becomes complicated and is insufficient in terms of productivity and economy.

In view of the above-mentioned prior art, the present invention provides a new manufacturing method that can improve the productivity and economy in manufacturing caliber rolls, and at the same time improve the structure around the caliber grooves formed and extend the life of the caliber rolls. The feature is that a roll material that approximates a predetermined roll shape is heated to 840 to 1100°C, and then, while rotating the roll material, a rotary forging process is performed that has an annular convex portion for forming caliber grooves. The member is advanced from the outer surface of the roll material in the radial center direction to forge the caliber groove while the roll material is extended in the axial direction, and the caliber shoulder raised on the outer surface of the roll material due to the forging is formed into the annular convexity. Auxiliary rollers connected to both sides of the part press the part flatly to form a caliber groove of a predetermined depth and a roll shape at the same time. At the point. In this case, the rotation speed is 1~
30r.pm is appropriate, and 1 to 6r.pm is preferable.

The present invention will be described in detail below. First, the materials of the roll manufactured according to the present invention include cast iron, adamite,
It may be made of ferrous materials such as cast steel or other materials to which appropriate alloying components are added, or non-ferrous metals.
This is particularly effective for the aforementioned adamite materials and cast iron materials. However, the content of elements such as carbon and PS that have a negative effect on hot plastic working must be selected in advance.

The roll material used in the present invention may be a sand mold, a metal mold, or a combination of both, may be as-cast by an appropriate casting method such as centrifugal casting, or may be plastically worked, and may be formed into a predetermined roll shape. Use something that approximates. In the present invention, as described later, the roll material is partially rolled down in the radial direction of the shaft and expanded in the axial direction, so the roll material is rotated to form the caliber grooves by calculating the deformation caused by this in advance. The part that receives the forging is large in diameter, and the part that receives the forging is small in the axial direction.

The roll material that has been cast or subjected to plastic working is subjected to rotary forging to form caliber grooves. FIG. 1 is an explanatory diagram of manufacturing a caliber roll by this rotary forging, and in the figure, 1 has one end supported by a rotary drive body 2 and the other end supported by a support roller 3, and is rotatable and shaft-supported. It is a roll material that is supported so that it can be expanded in the center direction.
In this case, one end of the raw material 1 which is pivotally supported by the rotary drive body 2 and to which torque is transmitted can also be used as a feeder portion during casting when the raw material 1 is as-cast. Reference numeral 4 denotes a rotary forging member, and in the illustrated example, in order to directly form the caliber groove 5, it is a disk on which an annular convex portion having a thickness and peripheral shape corresponding to the desired shape of the caliber groove 5 is formed. It consists of a pressure roller 6 shaped like a shape, and forming auxiliary rollers 7 of a small diameter and wide width that are connected integrally or separately on both sides of the pressure roller 6, and the pressure roller 6 and the auxiliary roller 7 are shown inside, respectively. Equipped with an optional cooling section. The rotary forging member 4 is mounted on a mounting base (not shown), and is movable forward and backward, right and left, with respect to the roll material 1, and its angle can be adjusted. This rotary forging member 4 is pressed perpendicularly to a predetermined position on the outer surface of the rotating material 1 and is advanced in the radial direction in sequence, thereby creating a caliber groove of a predetermined shape and depth in the material 1.
Heading. At this time, the material 1 is
The caliber groove 5 is plastically deformed in a fluid state and pressed.
Although the shoulder portion is raised, a predetermined caliber groove 5 can be formed by pressing the auxiliary roller 7 on the shoulder portion. Moreover, the material 1 expands in the axial direction to compensate for the volume reduction due to the forming of the caliber groove 5, but if the shape of the material 1 is calculated in advance as described above, the material 1 can be expanded by such rotary forging. can be formed into a predetermined caliber roll shape. Reference numeral 8 in the drawing designates a receiving roller that faces the rotary forging member 4 and supports the material 1 in contact with the rotary forging member 4 in order to prevent the material 1 from bending and deforming due to the pressure applied by the rotary forging member 4.

The shape of the caliber groove 5 to be forged may be any shape other than that shown in FIG. 1, such as that shown in FIG. 2, for example, and a pressure roll 6 corresponding to the shape may be used. As the rotary forging member 4, it is also possible to use, for example, a piece-like member in addition to those described above, but the pressure roller 6 is suitable for practical use.

Now, to explain the processing temperature of the material 1 during the rotary forging, in order to perform plastic working on the outer shell of the material 1 by rotary forging, the outer shell can be plastically deformed relatively easily. It is necessary to heat it up to temperature. However, when the heating temperature approaches the melting point, the softening and surface oxidation of material 1 become significant.
Therefore, the heating temperature of the outer shell of the material 1 is appropriately selected depending on the material 1. On the other hand, during rotary forging, if the rotary forging member 4 applies an external force that bends and deforms the material 1, a receiving roller 8 may be installed, but the roll material 1 itself lacks rigidity. This makes it difficult to carry out the required rotary forging. In view of this point, the present invention sets the heating temperature of the roll material 1 at 840 to 1100 DEG C. in order to obtain sufficient strength in the roll material 1 during rotary forging. That is, during rotary forging, the temperature is set such that the rigidity of the material 1 is maintained while the outer shell part can be plastically worked by rotary forging, and only then can smooth rotary forging be carried out. For example, in the case of adamite or cast iron rolls, rotary forging is carried out at around 1000°C on the outer shell.

According to the caliber roll manufacturing method of the present invention described above, the outer shell crystal structure around the caliber grooves formed by rotary forging is arranged in a continuous flat fine fiber shape along the caliber grooves, and the roll Defects such as cavities in the material are crimped to create a dense and healthy structure, and the base, precipitates, crystallized materials, etc. are homogenized. Especially when the material is adamite or cast iron, reticulated cementite or graphite is formed. Finely dispersed. Such a plastically deformed structure spreads over a fairly wide area around the caliber groove and even into the inside of the roll. Therefore, in the caliber roll according to the present invention, the properties in the caliber grooves are significantly different from those formed by cutting, and the structure is continuous, with uniform hardness distribution throughout the caliber grooves, and has excellent wear resistance and heat cracking resistance. You can get sex.

In addition, when heading the caliber grooves by the above-mentioned rotary forging, the roll material is plastically worked locally and sequentially, so the plastic deformation resistance is low and the pressing force of the rotary forging member is also relatively small. There is an advantage that a caliber groove of a predetermined shape and depth can be forged in a short time by moving the rotary forging member in the axial and radial direction. According to such rotary forging, the process of applying the required plastic working to the periphery of the caliber groove and the process of forming the caliber groove can be completed at the same time, which is extremely rational and efficient. In the present invention, after the caliber grooves are forged, they almost match the predetermined shape of the caliber roll, and when the roll is finally finished, only a slight surface treatment is required. Therefore, cutting is almost unnecessary, the material yield is improved, and it is also economical.

After forming the caliber groove by rotary forging, it is possible to perform surface finishing and use it immediately, or if necessary, after rotary forging, the heat treatment process consisting of quenching and tempering can be repeated one or more times. is also free.

As explained in detail above, in the method of manufacturing a caliber roll in which caliber grooves are forged by rotary forging according to the present invention, the structure around the caliber grooves is changed from a cast structure to a plastically worked structure, thereby improving the performance of the caliber grooves, especially the wear resistance. This has the effect of significantly increasing heat cracking resistance.
The rotary forging process includes a process of forging the caliber groove and a process of plastic working the periphery of the caliber groove, making it significantly more productive and economical than conventional caliber groove forming methods. Improved. Therefore, the present invention is an innovative method for manufacturing caliber rolls regardless of the material of the roll, and its practical effects are significant.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing another embodiment. DESCRIPTION OF SYMBOLS 1... Roll material, 2... Rotation drive body, 3... Support roller, 4... Rotation forging member, 5, 5... Caliber groove,
6, 6...pressure roller, 7...auxiliary roller, 8...receiving roller.

Claims (1)

[Claims] 1. Select a roll material that approximates the specified roll shape.
The roll material is heated to 840 to 1100°C, and then, while rotating the roll material, a rotary forging member having an annular convex portion for forming caliber grooves is advanced from the outer surface of the roll material in the radial center direction to forge caliber grooves. while stretching the roll material in the axial direction, and pressing the caliber shoulder raised on the outer surface of the roll material due to the forging into a flat shape by means of auxiliary rollers connected to both sides of the annular convex part, A method for manufacturing a caliber roll, characterized by simultaneously forming a caliber groove of a predetermined depth and a roll shape.