JPS5910405A - Rolling roll - Google Patents

Abstract

PURPOSE:To prevent the fracture of a roll for rolling metal consisting of ceramics and to prolong the life thereof by fitting a ring made of metal or plastics into the hole part for driving located in the side face of the roll. CONSTITUTION:A ring 2 consisting of metal or plastics or both thereof is fitted into the hole part on the side face of a roll 1 for rolling metal consisting of ceramics contg., for example, Si3N4 as essential component. The forward end of a key 3 for driving a rolling mill is fitted into the ring 2 to rotate a driving shaft 4 in the stage of using the roll. Therefore, the direct contact of the key 3 with the ceramics as in the perior art is obviated, and the impact force of the key 3 is reduced by the ring 2, whereby the generation and progression of crack are suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rolling roll used for rolling metals such as copper and copper alloys, aluminum and aluminum alloys, iron and iron alloys.

BACKGROUND ART Conventionally, materials for rolling rolls used to roll heated metal include cemented carbide containing WC (tungsten carbide) as a main component, die steel, and the like.

However, when these materials are used, the roll life is relatively short due to abrasion of the roll surface at the contact surface with the workpiece metal, cracking, reaction with the metal, etc., and roll replacement due to this. Or roll gold 4
・There was a defect that it took time to re-polish the contact surface with the first plate.

In view of the above, the present inventors investigated how to extend the life of the roll using various materials, and found that ceramic rolls were good, especially 818N4, a non-oxide ceramic that has been rapidly progressing in recent years, as the main component. We found that the raw material we created was optimal.

When ceramics are used as a roll material, a roll with a long life can be obtained, but it also has the disadvantage that ceramics are brittle and are susceptible to impact, and the variation in properties of ceramics is much wider than that of metals. .

Due to these drawbacks, when ceramic rolls are used, sometimes roll breakage accidents occur rather than the life span of the six rolls.

As a result of intensive investigation into the causes of breakage accidents, the present inventors have arrived at the present invention, that is, an improvement of a roll made of ceramic.

The present invention will be explained below based on the drawings.

That is, as shown in FIG. 1, this invention includes a kumquat rolling roll 1 made of ceramics, in which a ring 2 made of metal and/or synthetic resin is placed in a drive hole located on the side surface of the ceramic roll. As a result, ceramic rolls containing St, N, and others have succeeded in preventing breakage of the rolls, which impairs the long life of rolls made of these materials. is very large.

When the ring 2 made of metal and/or synthetic resin as in the present invention is not fitted, the gap between the side surface of the ceramic roll side hole and the drive key 3 increases the machining efficiency peculiar to ceramics. Because special technology is required, the diameter of the hole on the side of the roll is usually large, and when the rolling roll is started, the parking force of the drive key is applied to the side of the hole on the ceramic roll, causing cracks. There was a drawback that cracks occurred and developed or existing cracks developed, resulting in roll breakage.

As shown in FIG. 2, in this invention, a ring 2 made of metal and/or synthetic resin is fitted into a hole in the side surface of a ceramic roll l, and when this roll is used, the tip of a drive key 3 of a rolling mill is connected to the ring 2. After fitting into the drive shaft 4
Since the drive key rotates, the drive key does not directly hit the ceramic as in the conventional case, so the impact force of the drive key is reduced by the ring, making it possible to suppress the occurrence and progression of cracks. Note that 5 is a rolling groove.

For this reason, roll breakage accidents are almost eliminated, and wear on the surface of the ceramic roll becomes the only factor governing the life of the roll, resulting in a long life.

In the above, the ring that fits into the hole in the side surface of the ceramic roll may be made of either metal or synthetic resin depending on the operating temperature of the roll.

Synthetic resins are advantageous because they can be used at relatively low temperatures and have a large impact absorption capacity when deformed.

Furthermore, good results can also be obtained by combining both metal and synthetic resin.

To fit a metal and/or synthetic resin ring into a hole on the side of a ceramic roll, it is inserted directly into the hole without cold fitting, shrink fitting, or any special treatment, and then removed using a drive key. It can also be prevented.

The material of the ceramic roll in this invention is silicon nitride St, N, which is formed by S i ,
N, is 60i1! It is preferable to contain t% or more.

This is because impact resistance with a strength of -11 is required.

Next, AeN to be used for St, N, of 60 tons It 4 or more, A7? , 08, Y2O3, Mg0) Ca
b, YN% Zr0g, T 10s.

As for additives such as HfO2 as sintering aids, it is appropriate to use one or more of them in an amount of 1 to 40% by weight.

If it is less than 1% by weight, sufficient strength cannot be obtained and 40%
This is because if the weight exceeds 11 it%, it becomes brittle.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a rolling roll of the invention, and FIG. 2 is a combined view of the rolling roll and drive shaft of the invention. l... Roll body, 2... Metal and/or synthetic resin ring, 3... Driving key, 4...
Driveshaft patent applicant Akira Wada, Patent Attorney, Sumitomo Electric Industries Co., Ltd.

Claims (3)

[Claims] (1) A rolling roll made of ceramic for metal rolling, characterized in that a ring made of metal and/or synthetic resin is fitted into a drive hole located on the side surface of the roll. (2) A metal and/or synthetic resin ring is fitted into the drive hole on the side of the roll so that the drive key fitted into the hole does not come into direct contact with the ceramics. The rolling roll according to range 1. (3) The rolling roll according to claim 1, characterized in that the ceramic contains elemental silicon as a main component.