JPS63317206A - Builtup roll for rolling h-shape steel flange end - Google Patents

Abstract

PURPOSE:To obtain a pressure roll for an H-shape steel flange end excellent in abrasion resistance and anti-seizing property by fixing an inner sleeve and an outer sleeve to a roll axis and then forming a highly buildup hardened layer on the inner sleeve to provide an H-shape steel flange end face and its inner forming die part. CONSTITUTION:The roll axis 1 is inserted by shrinkage fit into the inner sleeve 2 and the outer sleeve 3 is fixed by shrinkage fit on the inner sleeve. Cast iron or steel having high toughness is used for the roll axis 1 but a disused simple roll can reclaimed, too. Steel material having 0.3-0.5wt.% carbon contents or low alloy steel is used as the material of the inner sleeve. Abrasion resistant material which is free from hardness reduction at a rolling temperature is used as building-up material for a highly buildup hardened layer 4. A flange end forming die part 5 and a flange end inner surface forming die part 6 are provided for the layer 4. Cast material such as 'Adamite(R)' material and ductile material, etc., is used for the outer sleeve 3. Therefore, this builtup roll is provided with abrasion resistance and anti-seizing property and enables a large reduction of fundamental unit.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a roll for rolling the flange end of an H-section steel, a so-called edger.
Regarding roles.

(Prior Art and Problems) In order to ensure the shape accuracy of the flange end, H-section steel is subjected to rolling for the purpose of straightening the end, as shown in FIG. 2. In the same figure, 20 is an H-shaped steel rolled material, 21 is a roll for rolling the flange end, and a flange end face forming mold part 22 for forming the flange end face and the end inner face on the outer circumferential surface of the roll body, and the flange inner face. A mold portion 23 is formed.

Conventionally, this type of rolling roll has been used by cutting out a desired single roll 25 from a roll material 24 cast from adamite material or ductile cast iron material, as shown in FIG.

However, the base of the flange end face molding part and the flange inner face molding part (the part corresponding to the inner surface of the flange end part) used for straightening the flange end part is subject to a large rolling load, and the parts are scraped from the inside of the casting. Because the material is exposed to heat, it has poor abrasion resistance and roughness resistance, and has the drawbacks of high processing costs.

Therefore, as shown in FIG. 4, an assembled roll is constructed in which an inner sleeve 32 for rolling the flange end surface is fixed to a roll shaft 31, and an outer sleeve 33 for engaging and guiding the inner surface of the flange is fixed to the outer peripheral surface of the inner sleeve 32. devised.

The inner sleeve 32 and outer sleeve 33 are manufactured by casting, but since the hardened layer on the surface of the casting can be effectively used, rolling characteristics are improved, and the roll shaft can be reused. Therefore, we were able to reduce manufacturing costs.

However, in recent years, there has been a growing demand for improved productivity and improved product shape and quality.

The present invention was made in view of such a need, and an object of the present invention is to provide a roll for rolling the end of an H-section steel flange, which is easy to manufacture and has excellent wear resistance and roughness resistance.

(Means for Solving the Problems) In order to achieve the above object, the rolling roll of the present invention has an inner sleeve 2 for rolling an H-section steel flange end fixed to a roll shaft 1, and the outer peripheral surface of the rolling roll is fixed to a roll shaft 1. An outer sleeve 3 that engages with the inner surface of the flange is fixed to the outer sleeve 3, and a hardened hardened layer 4 is formed on the circumferential outer periphery of the inner sleeve where the flange end abuts and in the vicinity thereof, and the hardened layer 4 is formed on the hardened N'4 on the flange end surface. The structure of the invention is that a mold part 5 and a flange end inner mold part 6 are formed.

(Function) A flange end face forming mold part 5 and a flange end inner face forming mold part 6 for rolling forming the H-shaped steel flange end are formed on the high hardness hardfacing layer 4 provided on the outer peripheral surface of the inner sleeve 2. Therefore, excellent wear resistance and roughness resistance can be imparted to the inner sleeve 2 on which the flange end is rolled.

Since the high-hardness hardfacing layer 4 only needs to be formed at a specific location on the inner sleeve 2 where the flange end comes into contact, the overlaying work is easy and the amount of overlay material used is small, making it economical. Excellent in

(Example) Fig. 1 shows an assembled roll for rolling the end of an H-section steel flange according to the present invention, in which an inner sleeve 2 is shrink-fitted to a roll shaft 1, and an outer sleeve 3 is shrink-fitted thereon. ing.

The roll shaft 1 is made of cast iron or steel material with excellent toughness, and a discarded single roll can be recycled.

The inner sleeve 2 is for rolling the flange end face and end inner surface of the H-section steel. A hardened build-up layer 4 of high hardness is formed by build-up by welding on the portion where the flange end abuts.

The material forming the inner sleeve 2 has a carbon content of 0.
．． 3 to 0.5 wt% of steel and low alloy steel are preferred.

This is because it has good weldability and toughness.

The overlay material forming the high hardness overlay hardened layer 4 includes:
The hardness is Hs80 or more, and the rolling temperature (900-950
It has good abrasion resistance without decreasing hardness at a temperature of about 10.degree.

A flange end face molding part 5 and a flange end inner face molding part 6 are formed in the high hardness overlay hardening layer 4.

The outer sleeve 3 engages with the inner surface of the flange of the H-shaped steel and is mainly used to guide it, and as in the past, a relatively inexpensive cast material such as adamite material or ductile material is used. Ru.

Next, specific examples will be listed and explained.

(1) As shown in FIG. 1, an inner sleeve and an outer sleeve were assembled by shrink fitting onto a roll shaft of 1020 φvan x 22001 mm.

At this time, a discarded single Adamite roll was used for the roll shaft. The inner sleeve is made of 345C, and the following HSS-based hardening material is used on the predetermined outer periphery, and the build-up thickness is 15 l.
A hardened build-up layer with a build-up width of 110 mm and a hardness of Hs 85 to 90 was formed. The outer sleeve is C1.6~1.7 in.
It was made of adamite material with a t% of about 45 II s.

・Buildup hardening material (unit -t%) C: 1.40$, Si: 0.30χ, Mn
: 0.25χNi: 0.15χ, Cr: 4
．． 04χ, Mo: 4.85χV: 3.50χ
, W: 6.50χ, Co: 9.05χ, remainder substantially Fe (When we actually carried out straightening rolling of the H-beam flange end using 21(1) assembled rolls, approximately 10,000 to
It can be rolled and has not yet been revised.

(3) For comparison, straightening rolling was performed under the same conditions using a single adamite roll made of a high-hardness adamite material (hardness around 50 Hs) with the following composition. 20
At 0.00 tons, it becomes difficult to correct the shape of the flange end.
Also, my skin became noticeably rougher.

- Roll composition (single wt%) C:2. OX, Si: 0.5X, Mn: 1. O'A
Ni: 0.9'A, Cr: 1.1χ, Mo:
0.25χ Remainder substantially Fe (Effect of the invention) As explained above, the roll for rolling the H-section steel flange end of the present invention forms a high hardness hardfacing layer on the predetermined outer circumference of the inner sleeve. Since the flange end mold part and the flange end inner mold part were formed in the hardened layer, it had excellent wear resistance and seizure resistance, and it was possible to significantly reduce the unit consumption. In addition, it is sufficient to simply form a high-hardness build-up layer on a predetermined outer peripheral portion of the inner sleeve, making it easy to manufacture the row tile and providing excellent economical efficiency.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the main parts of the assembled roll for rolling the H-section steel flange end of the present invention, Fig. 2 is an explanatory diagram showing the rolling state of the H-section steel flange end, and Fig. 3 is a single roll being machined. FIG. 4 shows a cross-sectional outline of the main part of a conventional assembled roll for rolling the end of an H-shaped steel flange. DESCRIPTION OF SYMBOLS 1... Roll shaft, 2... Inner sleeve, 3... Outer sleeve, 4... High hardness build-up hardened layer, 5... Flange end mold part, 6... Flange end inner surface Molding mold part.

Claims (1)

[Claims] (1) An inner sleeve 2 for rolling the end of an H-shaped steel flange is fixed to the roll shaft 1, and an outer sleeve 3 that engages with the inner surface of the flange is fixed to the outer peripheral surface of the inner sleeve 2, and the periphery of the inner sleeve that the flange end abuts is fixed to the roll shaft 1. An H-beam steel flange characterized in that a high-hardness build-up hardened layer 4 is formed on the outer circumference and the vicinity thereof, and a flange end face molding part 5 and a flange end inner molding part 6 are formed on the hardened layer 4. Assembly roll for end rolling.