JP2005169417A - Mill guide of reverse mill - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mill guide of a reverse mill for rolling a steel bar, with which rubbing between a guide plate and a rolling material during using the mill guide, which is a conventional problem, is prevented and the occurrence of scratch is prevented. <P>SOLUTION: In the mill guide of the reverse mill, the occurrence of scratch of the mill guide and the rolling material is reduced by allowing the contact with the material at rolling to be changed into rolling contact by using rollers which are provided on vertical pins with which a pair of guide plates are supported. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a mill guide used in a reverse mill for rolling steel bars.

  2. Description of the Related Art Conventionally, a reverse mill that performs rolling by reciprocating a material by rotating a roll forward / reversely is known as a rolling mill for rolling steel bars and the like. FIG. 4 is a schematic diagram of a reverse mill for rolling steel bars. As shown in FIG. 4, a reverse mill 10 is disposed in a reverse rolling line 9. The reverse mill 10 includes a pair of upper and lower rolls 11. The roll 11 is formed with a mold groove (caliber) 12, and rolling is performed by changing the caliber 12 depending on the rolling shape. A guide support base 13 is disposed on the entry side and the exit side of the roll 11 in the reverse mill 10, and a mill guide 14 for steel bar guidance is disposed on the guide support base 13. Reverse rolling while changing the caliber.

  During reverse rolling, it is necessary to place a guide according to the entrance side dimension of the steel bar on the entrance side and a guide that takes into account the width expansion or shape change due to rolling on the exit side. It was necessary to install mill guides on the entry and exit sides according to the number. Further, a reverse mill mill guide is disclosed in Japanese Patent Application Laid-Open No. 2003-53413 that uses a mill guide that can handle both the entry side and the exit side of the mill, and that can reduce the number of calibers used by reciprocating rolling of the same caliber. It is introduced in the gazette (patent document 1).

  FIG. 5 is a side view of a mill guide of a conventional reverse mill. FIG. 6 is a plan view of a mill guide of a conventional reverse mill. As shown in FIGS. 5 and 6, the guide plate 1 is supported by the vertical pin 2 and the shaft 4, and when the hydraulic cylinder 7 on the upper part of the guide body 5 moves back and forth, the connected inclined guide 8 moves back and forth. The shaft 4 portion of the guide plate 1 moves and the guide plate 1 opens and closes with the vertical pin 2 portion as a fulcrum. In addition, a pair of reverse guides arranged on both sides of the reverse mill are alternately switched between one guide state on the entry side and the other guide state on the exit side, so that one caliber can be reciprocated without changing the guide. It is possible to roll steel bars.

JP 2003-53413 A

  However, this guide has a plate-like portion that comes into contact with the material during rolling, and unevenness occurs in the guide plate due to contact wear between the rolled material and the guide plate when used for a long time. When the guide plate and the material are rubbed due to the unevenness, there is a drawback that the rolling material may be scratched. The present invention provides a mill mill guide for a reverse mill for rolling steel bars that prevents friction between the guide plate and the rolling material when using the reverse mill guide, which is a conventional problem, as described above, and prevents generation of scratches. It is.

The gist of the invention is that, in the mill guide of the reverse mill, the material contact at the time of rolling is made to be rolling contact by a roller provided on a vertical pin supporting a pair of guide plates. The present invention relates to a mill guide for a reverse mill characterized by reducing the occurrence of scratches.
That is, the present invention is to attach a roller that rotates around a vertical pin that supports the guide plate, and in order to attach the roller, the inside of the guide plate is cut while leaving the top and bottom of the vertical pin insertion portion. The purpose is to attach a roller with a vertical pin as an axis to the cut space. As a result, in the reverse mill guide, the contact portion between the rolling guide and the rolling material can be made into a roller to prevent scratching during rolling.

  As described above, since the reverse mill guide according to the present invention is made into a roller, a roller is provided at a contact portion between the rolling material and the mill guide at the time of rolling. Abrasion scratches can be prevented.

Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is a side view of a roller guide of a reverse mill according to the present invention. FIG. 2 is a plan view of a mill guide of a reverse mill that is a roller according to the present invention. As shown in FIGS. 1 and 2, the reverse mill guide according to the present invention includes a guide main body portion 5 whose cross-sectional shape is a square tube shape, and is provided at both ends of the guide main body portion 5 (near the rolling rolls). Are formed with shaft holes penetrating vertically, supporting vertical pins 2 facing in the vertical direction, and symmetrical side guide plates 1 in the horizontal plane on both sides of the guide body 5 via the vertical pins 2. It is supported so that it can rotate. A roller 3 is attached inside the side guide plate 1 with the vertical pin 2 as an axis.

  FIG. 3 is a schematic diagram of the guide operation during reverse mill rolling according to the present invention. FIG. 3A shows the entry side guide state, and FIG. 3B shows the exit side guide state. Arrows indicate the rolling direction. As shown in FIG. 3, the guide plate 1 operates in the open direction in the entrance side guide state, and the guide plate 1 operates in the closed direction in the exit side guide state. In this way, when reverse rolling is performed using a reverse mill guide such as a steel bar by using a reverse mill guide as a roller, the contact between the guide body and the rolling material becomes a roller portion, which improves the conventional sliding contact to the rolling contact, It is configured to be able to prevent the occurrence of scratches caused by the plate.

Hereinafter, the present invention will be specifically described according to examples.
A material having a cross-sectional shape of 206 × 206 mm is rolled into a cross-sectional shape of 181 × 181 mm by two-pass reverse rolling with a square caliber. In this case, as a result of rolling using the roller-shaped reverse mill guide, when the material at the time of rolling comes into contact with the guide, the roller rotates and comes into rolling contact, so that the guide plate is not uneven due to wear. As a result, it was possible to perform rolling without causing scratching by the guide plate.

It is a side view of the mill guide of the reverse mill made into a roller concerning the present invention. It is a top view of the mill guide of the reverse mill made into a roller concerning the present invention. It is a guide operation schematic diagram at the time of reverse mill rolling concerning the present invention. It is the schematic of the reverse mill for steel bar rolling. It is a side view of the mill guide of the conventional reverse mill. It is a top view of the mill guide of the conventional reverse mill.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Side part guide plate 2 Vertical pin 3 Roller 4 Shaft 5 Guide main body 6 Roll 7 Hydraulic cylinder 8 Inclination guide 9 Rolling line 10 Reverse mill 11 Roll 12 Caliber 13 Guide support stand 14 Mill guide


Patent Applicant Sanyo Special Steel Co., Ltd.
Attorney: Attorney Shiina

Claims (1)

In the mill guide of the reverse mill, the roller provided on the vertical pin supporting the pair of guide plates reduces the occurrence of scratches between the guide and the rolling material by turning the material contact during rolling into rolling contact. A featured reverse mill mill guide.

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