Apparatus for securing a work roll in a rolling mill

Abstract: An apparatus for securing a work roll (101) in a rolling mill is proposed. This apparatus is of a type provided with a pair of roll holders (102) respectively abutting on the flat surfaces of each work roll (101) so as to be adapted to clamp the work roll (101) by means of clamping means (122,123). A feature resides in serrated members (133,134) interposed between each flat surface of a work roll (101) and the contact surface of each roll holder (102).

Description: FIELD OF THE INVENTION The present invention relates to an apparatus for securing a work roll between a pair of roll holders in a rolling mill according to the precharacterising portion of the claim. BACKGROUND OF THE INVENTION In prior art three-roll mills, each work roll was keyed on a driving shaft or otherwise secured thereto by means of, e.g., a polygonal engaging member. When a work roll secured in this manner was to be replaced with another one, special tools were required for the work of aligning a key with a keyway or handling the engaging member. The laborious and time-consuming character of such work has resulted in the deterioration of operation efficiency. SUMMARY OF THE INVENTION It is an object of the present invention to provide an apparatus for securing a work roll between a pair of roll holders in a rolling mill, the construction of the apparatus being such that the work of replacing a work roll with another one can be easily done. Thus in accordance with the present invention, each clamping means comprises a bolt and a nut and in that serrated rings are interposed between each flat surface of a work roll and the contact surface of each roll holder, so that the work roll may be replaced by loosening the nut to separate the holders and drawing out the bolt. Upon manipulation of the clamping means, a pair of roll holders are allowed to approach each other so that the work roll disposed therebetween may be clamped. The serrated members make certain that the work roll is held firm to the roll holders. In order to replace the work roll with another one, the clamping means have only to be loosened so as to detach the roll holders from the work roll. Then the serrated members are disengaged and the work roll is ready for being removed. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an entire sectional view of a principal portion in a preferred embodiment for a roll fixing device in 3-roll rolling mill. Fig. 2 is a sectional view of a principal portion of the roll fixing device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In Fig. 1 101 does show three rolling rolls arranged radially at an interval of 120 in the vertical plane, the rolls 101 being sandwiched by the respective pair of roll holders 102 which are supported through bearings 103 by tubular support frames 104 rotatably at an eccentric point. The feature that the roll holders 102 are supported by the tubular support frames 104 is provided for that the support frames 104 are rotated to shift the roll holders 102 with respect to the central portion of rolled material so as to adjust the depression amount of rolling rolls 101. It will be appreciated that the rolling rolls 101 are adapted to be driven for rotation by an input side gear 106 through a vebel gear 105 interlocked with the roll holder 102. The rolling rolls 101 are sandwiched at both lateral sides by the pair of roll holders 102, and the rolls and holders are tightened at a serrated part 121. As seen in Fig. 2 the pair of roll holders 102 are adapted to approach each other by a tightening member including a bolt 122 and a nut 123. The rolling roll 101 is provided at both sides with a first annular groove 131, and the corresponding roll holders 102 are provided at their surfaces with a second annular groove 132. A serration ring 133, 134 which is serrated at one side surface is fit into the annular grooves 131, 132. The serration rings 133, 134 are fit to the rolling roll 101 and roll holder 102 by use of a mounting pin (not shown) as that the serrated parts of the serration rings fit in the opposing annular grooves 131, 132 are engaged with each other. In fixing the rolling roll 101 and roll holders 102, the nut 123 is screwed in the state that the rings 133, 134 are mounted in the annular grooves 131, 132, so as to cause one roll holder 102B to approach the other roll holder 102A to tighten the roll 101 by the holders 102A, 102B, thereby causing the serration rings 133, 134 to be brought into mesh with each other, and the roll 101 to be fixed. The rolling roll 101 may be replaced by loosening the nut 123 to separate the holders 102A, 102B and draw the bolt 122. Since the rolling roll 101 and roll holders 102 are coupled and fixed by use of the serration rings 133, 134, a driving force to be transmitted to the other rolls through the vebel gear 105 connected with the holders 102 can be made quite larger in comparison with the case that a driving force is transmitted through a frictional force obtained by a mere sandwiching of the rolling roll with a pair of roll holders. In the above example, serration rings are used as the serrated part to couple and fix the roll and holders. Alternatively, the serrated part may be formed directly on the rolling roll and roll holders which are coupled and fixed to each other. The abovesaid fixing device may be applicable to a common roll holder 102B to approach the other roll holder 102A to tighten the roll 101 by the holders 102A, l02B, thereby causing the serration rings 133, 134 to be brought into mesh with each other, and the roll 101 to be fixed. The rolling roll 101 may be replaced by loosening the nut 123 to separate the holders 102A, 102B and draw the bolt 122. Since the rolling roll 101 and roll holders 102 are coupled and fixed by use of the serration rings 133, 134, a driving force to be transmitted to the other rolls through the vebel gear 105 connected with the holders 102 can be made quite larger in comparison with the case that a driving force is transmitted through a frictional force obtained by a mere sandwiching of the rolling roll with a pair of roll holders. In the above example, serration rings are used as the serrated part to couple and fix the roll and holders. Alternatively the serrated part may be formed directly on the rolling roll and roll holders which are coupled and fixed to each other. The abovesaid fixing device may be applicable to a common rolling mill other than the 3-roll rolling mill referred to above. As seen from the above, according to the rolling fixing device of the present invention, fixing of rolling roll and roll holders is carried out through the serrated part, so that the pair of roll holders may be approached each other merely by tightening a tightening member to surely and simply fix the roll and holders. Also, in replacement of the rolling rolls, the tightening member may be loosened to separate the roll holders for removing the rolls, thereby providing a quite simple and quick replacement work for the rolling rolls in comparison with the conventional case that a rolling roll is fixed to its driving shaft by use of a key or the driving shaft is given a polygonal sectional shape for fitting into the roll.

Claims: An apparatus for securing a work roll (101) in a rolling mill, wherein three work rolls (101) are arranged radially at an interval of 120° in the vertical plane and a pair of roll holders (102) respectively abut on the flat surfaces of each work roll (101) so as to be adapted to clamp said work roll (101) by means of clamping means (122, 123), characterized in that each clamping means comprises a bolt (122) and a nut (123) and in that serrated rings (133, 134) are interposed between each flat surface of a work roll (101) and the contact surface of each roll holder (102), so that the work roll (101) may be replaced by loosening the nut (123) to separate the holders (102) and drawing out the bolt (122).

Inventors: ISHIBASHI TOSHIHIRO, NAKAMURA MITSURU, NOGUCHI YUKIO, TAGUCHI ICHIZO, TODA YUKATA, TSUMURA JUN-ICHI, ISHIBASHI, TOSHIHIRO, NAKAMURA, MITSURU, NOGUCHI, YUKIO, TAGUCHI, ICHIZO, TODA, YUKATA, TSUMURA, JUN-ICHI, ISHIBASHI, TOSHIHIRO C/O NIPPON STEEL CORP.,, NAKAMURA, MITSURU C/O NIPPON STEEL CORP.,, NOGUCHI, YUKIO C/O NIPPON STEEL CORP. TECHNICAL, TAGUCHI, ICHIZO C/O HITACHI ZOSEN CORP., TODA, YUKATA C/O NIPPON STEEL CORP.. MURORAN WORKS, TSUMURA, JUN-ICHI C/O HITACHI ZOSEN CORP.
Applicants: HITACHI SHIPBUILDING ENG CO, NIPPON STEEL CORP, HITACHI ZOSEN CORPORATION, NIPPON STEEL CORPORATION
Application year: 1991
Main classification: B21B27
IPC codes: B21B27