JPS5932204B2 - Groove rolling roll - Google Patents

Description

[Detailed description of the invention] The present invention relates to a grooved mill roll.

Groove rolling refers to forming a groove between a pair of rolls and rolling a material with this groove to obtain a product with a predetermined shape.

Targeted products include shaped steel such as ■-shaped, H-shaped, C-shaped, and L-shaped steel sheet piles.

Conventional pores are formed by forming several types of pores on the outer peripheral surface of a solid roll.

Depending on the shape of the hole, there are parts that are subject to severe wear, resulting in poor roll consumption.

Furthermore, since many types of rolls must be prepared to suit various rolling dimensions, the number of rolls on hand becomes extremely large.

Therefore, an object of the present invention is to obtain a grooved rolling roll in which only the grooved portion of the roll can be easily replaced, thereby improving the roll consumption rate and reducing the number of rolls owned.

The groove type rolling roll of the present invention has a variable crown that controls the amount of roll crown by adjusting the pressure of the medium.
It is characterized by using a roll, attaching a sleeve with a groove to the outer periphery of the crown roll, and attaching and removing the groove sleeve by adjusting the roll crown.

First, referring to FIG. 1A, a variable crown roll C used in the present invention will hereinafter be simply referred to as a VC roll.

) will be briefly explained. The VC roll has an annular gap 11 between the taper 1 and the sleeve 2, and a high-pressure medium (for example, water, oil, , grease, etc.), and the unit 3 adjusts the pressure of the medium to control the amount of crown of the roll (the amount of tension in the radial direction of the roll).

FIGS. 1B and 1C show a VC roll provided with a plurality of pressure receiving chambers.

Select the number of pressure receiving chambers depending on the required purpose.

FIG. 2 shows the basic structure of the grooved mill roll of the present invention.

The structure of the VC roll is substantially the same as that shown in FIG.

A hole-shaped sleeve 4 is attached to the outer periphery of the sleeve 2.

A normal hole pattern 41 is provided on the outer periphery of the hole type sleeve 4 .

When installing the hole type sleeve 4, the pressure of the medium is lowered to minimize the amount of tension in the sleeve 2.

Although the radial expansion pressure of the sleeve 2 is sufficient for fixing the hole-type sleeve 4, in order to ensure the fixation to the sleeve 2, a conventional key 42 may be installed as shown in FIG. Alternatively, the nut 5 may be used for conventional tightening.

Further, the hole-side sleeve 4 may be integrally molded, but as shown in FIG. 3, it can be divided into parts for each hole type to facilitate replacement of holes that are particularly worn.

When the hole-shaped sleeve 4 is made into a split type, the inner peripheral corners of the sleeve 4 may interfere with adjacent sleeves, or stress concentration may occur due to expansion of the sleeve 2.

In order to prevent such a phenomenon, it is preferable to provide a notch 43 at the inner peripheral corner of the sleeve 4.

Furthermore, in order to facilitate attachment and detachment of the hole-shaped sleeve 4, it is preferable to provide a tapered portion 21 at the end of the sleeve 2.

FIG. 4 shows an example of application of the grooved roll of the present invention.

This roll is an example of an edge roll used in the intermediate rolling process of H-section steel, which is made into a grooved sleeve.

Considerable effects can be obtained simply by upgrading one of the conventional grooved rolls to the grooved rolling roll of the present invention.

Next, rolling examples using the grooved rolling roll of the present invention will be described.

<Example I> Roll dimensions: Diameter 1260 m x Body length 25001 m Sleeve 2 thickness near 0 mm Hole type: 3 hole types for sheet pile Media: Flame retardant oil medium Pressure crab 330 kg/cmf Rolling structure finisher mill It was assembled and subjected to SP■ rolling.

As a result, a good product was obtained with no slippage of the sleeve.

<Example ■> The roll of Example I was used.

The hole type sleeve 4 is divided into three parts, and the medium pressure is set to 450 kg/
I changed it to cmf.

There was no slippage of the sleeve, and good rolling was performed.

During rolling, the center grooved sleeve was severely worn, so it was replaced.

<Example Seal> Roll dimensions: Diameter 1350 x body length 3000 Thickness of fighting sleeve 2: 100 Hole type: Box hole type, H-shaped steel molding hole type (2-part medium:
Flame-retardant oil medium pressure rolling at 500 kg/aft: Rough rolling of H-beam steel (H400x300) was performed.

Then, it was replaced with another H-shaped steel forming hole mold (H450X300).

Result: A rough-shaped steel piece for H-beam steel with a good shape was obtained.

<Example 2> Using the rolls of Example 1, continuous casting slag was rolled into a rough-shaped steel piece for H-beam steel.

For breakdown mill rolls, the beam blank forming hole type was changed for each product series.

We have been able to reduce the 50 sets of breakdown rolls we previously had to just a few main rolls, including spares, and approximately 25 types of molded sleeves for each series.

Even for H-section steel with special specifications other than JIS and ASTM standards, it was previously necessary to create a breakdown roll suitable for the target dimensions. Based on the present invention, only the forming hole type sleeve is changed. As a result, rolling became possible, and manufacturing with special small loft dimensions was possible with almost no capital investment.

[Brief explanation of the drawing]

FIG. 1 is a semi-dead longitudinal cross-sectional view of a VC roll used in the grooved mill roll of the present invention. FIG. 2 is a semi-open vertical cross-sectional view of the grooved mill roll of the present invention. FIG. 3 is a partial vertical sectional view of another embodiment of the grooved mill roll of the present invention. FIG. 4 is a partial vertical sectional view of still another embodiment of the grooved mill roll of the present invention. 1: Taper, 2 sleeve, 4: Hole type sleeve, 5: Tightening with nut, 41: Hole type.

Claims (1)

[Claims] 1. A grooved sleeve provided with a groove is attached to the outer periphery of a variable crown roll that expands the sleeve in the radial direction by supplying a pressure medium to the gap formed between the taper and the sleeve. Groove type rolling roll. 2. The grooved rolling roll according to claim 1, wherein the grooved sleeve is of a split type. 3. The grooved rolling roll according to any one of claims 1 to 2, characterized in that the grooved sleeve is provided with a notch at an inner circumferential edge thereof. 4. The grooved rolling roll according to any one of claims 1 to 3, characterized in that a tapered portion is provided on the outer periphery of the end of the grooved sleeve.