JP3386952B2 - Guide adjustment mechanism for rolled material in rolling mill - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guide for guiding a billet between upper and lower rolling rolls in, for example, a section rolling mill, and more particularly to a guide for a chock. The present invention relates to a guide adjustment mechanism for a rolled material, which has a high mounting accuracy and can be easily attached and detached. [0002] Guides for guiding a billet between the upper and lower rolls of a rolling mill are provided at the entrance and exit of the rolls. This guide wears the rolls due to rolling on the slab and changes its outer diameter, so it is necessary to adjust the position in the height direction to correctly guide the slab between the rolls for this amount of change It is. A rolling mill having such a height adjusting mechanism is disclosed, for example, in Japanese Patent Publication No. 53-25827. In this method, a guide is attached to a rest bar arranged so as to connect between roll chocks, and the position of the guide relative to the roll is adjusted by raising and lowering the rest bar itself. FIG. 6 is a partially cutaway plan view showing a connection structure of a rest bar to a chock described in this publication. The entrance side and the exit side are parallel to a roll 52 having one end held by a chock 51. Are located respectively. An engagement groove 51a for guiding the rest bar 53 in the vertical direction is formed in the chock 51 over the entire length in the vertical direction, and the rest bar 53 is provided with an engagement protrusion 53a that slides in the engagement groove 51a. . [0005] The rest bar 5
In order to fix and hold the clamp bar 3, a clamp gate 54 which abuts against the surface side of the rest bar 53 and restrains the
4a, it is attached to the chock 51 so as to be freely opened and closed. The clamp gate 54 is connected to the bolt 5
4b, the rest bar 52, which has been fixed to the chock 51 and whose height has been adjusted, is held at a predetermined position. [0006] When rolling, the roll 5
2, a vibration and an impact force are generated, and the vibration exerts a striking force in the groove 51a where the chocks 51 and the rest bar 53 contact each other in the left-right direction and the up-down direction in the figure. Such acting force concentrates stress on the engagement groove 51a in which the engagement protrusion 53a is fitted, and the engagement groove 51a is more easily damaged than other parts. If the engagement groove 51a is damaged or uneven wear occurs, the rest bar 53 is in a posture twisted with respect to the axis of the roll 52.
The position of the guide (not shown) held at 3 changes, and the accuracy of guiding the billet between the rolls 52 is greatly reduced. Therefore, if the position of the guide is not appropriate, it is necessary to repair it. However, the engagement groove 51 of the chock 51 itself is used.
Since a is damaged, it is necessary to build up the engagement groove 51a and machine it for this repair, and the chock 51 is repaired off-line. Therefore, in order not to lower the operation rate of the line, it is necessary to prepare a spare chock, which increases the complexity of storage and management. Further, if the parallelism of the rest bar 53 with respect to the axis of the roll 52 is broken due to damage or uneven wear of the engaging groove 51a, uneven wear or surface damage is caused on the guide itself and the roll 52. There is also a risk that the surface of the rolled material may be damaged. [0010] Further, in the case of a poor biting of the billet, the billet hits the guide and the rest bar 53
May be damaged. If the rest bar 53 bends in this way, the roll 52 and the chock 51 cannot be integrally reassembled from the rolling mill, and in general, the rest bar 53 is cut and dismantled using a gas cutting machine. It will stop for a long time. In addition, if a gas cutting machine or the like is used, the surface of the rolling roll may be damaged due to adhesion of cut pieces or the like. The problem to be solved in the present invention is to provide a rolled material guide adjusting mechanism which can maintain the position of the guide with respect to the roll with high accuracy and can perform the work of setting and repairing the guide which does not require replacement of a chock or the like. It is in. [0012] In a rolling mill in which a guide for guiding a rolled material between upper and lower rolls held by upper and lower chockes is connected to a rest bar which can be moved up and down by the upper and lower chock, respectively. , The long axis of the rest bar
Of the end surfaces in the direction facing the rolling roll
A flat fixed seat is formed on the opposite side of the fixed seat, and an engaging groove which runs in a vertical direction is formed in a portion included in the fixed seat, and the chock is rotatable to open and close the surface of the fixed seat. A clamp gate is provided to cover the fixed seat and connect the clamp seat capable of restraining the fixed seat to the chocking measurement, and the clamp gate is provided with an engagement protrusion fitted to the engagement groove. I do. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Just by connecting a clamp gate to the chock side so as to be able to open and close freely, the rest bar is rolled between the clamp gate and the fixed seat of the rest bar by an engagement projection and an engagement groove, respectively. By restraining the clamp gate in a closed posture and fixing it to the chocks by bolts or the like, the front and back surfaces of the rest bar can be held and fixed.
Therefore, it is only necessary to provide only the pivot point of the clamp gate and the fixing point by the bolt on the chock side, and there is no intervening engaging portion of the unevenness with the rest bar unlike the conventional case, thereby preventing the chock side from being damaged. Is done. [0014] Further, the engaging force between the engaging projection and the engaging groove between the clamp gate and the rest bar is designed to be damaged and destroyed earlier than other parts by the impact applied to the rest bar. Therefore, when the rest bar is subjected to impact or large bending deformation, only the engagement point between the clamp gate and the rest bar can be destroyed without being connected to the choke side, and repair work can be performed only by replacing parts in these clamp gate and rest bar units It can be performed. FIG. 1 is a cutaway front view showing a roll portion of a rolling mill provided with a guide adjusting mechanism of the present invention, and FIG.
FIG. 3 is a cutaway plan view of a main part taken along a line arrow. In FIG. 3, the left half shows the upper roll side and the right half shows the lower roll side. In the drawing, an upper roll 4 and a lower roll 5 are held by an upper chock 2 and a lower chock 3 incorporated in the housings 1a and 1b, respectively. Rest bar 6,
7 is connected so as to be able to move up and down. And rest bar 6,
7 is provided with guides 8 and 9 for guiding the steel slab between the upper and lower rolls 4 and 5, respectively. FIG. 4 is a cutaway front view of a main part showing a height adjusting mechanism of the rest bars 6, 7, and FIG. 5 is a cutaway plan view of a main part showing a connecting structure of the rest bar 6 to the upper chock 2. The lifting mechanism of the rest bars 6 and 7 is the same as that described in JP-B-53-25827 described in the section of the prior art, and the rest bar 6 arranged on the upper side has the upper chock 2 penetrated from above. One end of the rest bar 6 is engaged with a lifting nut 10b screwed to the bolt 10a, and by rotating this bolt 10a, the height of the rest bar 6 is adjusted by moving the rest bar 6 up and down. Further, the rest bar 7 arranged on the lower side abuts a plurality of liners 11b on the upper end of a fixing bolt 11a through which the lower chock 3 penetrates from below, and the rest bar 7 is placed on the upper end of these liners 11b.
And is supported by receiving the lower surface on one end side. The height position of the rest bar 7 is also adjusted by changing the number of liners 11b. In order to fix the rest bars 6 and 7 to the upper and lower chocks 2 and 3, respectively, clamp gates 12 and 13 are attached to the upper and lower chocks 2 and 3 so as to be freely opened and closed as shown in FIG. As shown in FIG. 5, the clamp gate 12 on the upper roll 4 side is attached to the upper chock 2 by a pin 12a so as to be openable and closable, and is shown in FIG. 1 when the posture is set to cover the surface of the rest bar 6 as shown. As described above, the upper and lower ends are integrally fixed to the upper chock 2 by the bolts 12b, whereby the rest bar 6 is restrained and fixed. The same applies to the mounting structure of the rest bar 7 disposed on the lower side. As shown in FIG. 3, the rest bar 7 is connected to the lower chock 4 by a pin 13a so as to be openable and closable, and as shown in FIG. It is connected to the body. As shown in FIG. 4 and FIG.
On one end side, a flat-surface fixed seat 6a stealing the surface side meat is formed, and the fixed seat 6a is provided with an engagement groove 6 in the longitudinal direction.
b is provided. The fixed seat 6a and the engaging groove 6b are provided symmetrically at both ends of the rest bar 6, and the fixed seat 7a and the engaging groove 7b are similarly formed on the lower bar 7 as shown in FIG. are doing. On the other hand, the fixed seat 6 is
An engagement block 12c that fits into the engagement portion 6b of FIG. The engagement block 12c is of a long shape substantially equal to the length of the engagement groove 6b in the vertical direction, and is similarly provided on the clamp gate 12 disposed on the left side as shown in FIG. The clamp gate 13 has the same structure as the engagement block 1.
3c and its mounting bolt 13d. In the above configuration, as shown in FIGS. 1 and 3, the rest bars 6, 7 are set in the closed posture with the clamp gates 12, 13 closed, and the bolts 12 b,
By being fixed to the upper and lower chocks 2 and 3 by 13b, it is held at a predetermined position. As shown in FIG. 5, this fixed holding is performed in a state where the back surface of the clamp gate 12 covers the fixed seat 6 a of the rest bar 6 and the engagement block 1.
2c is maintained by the relationship fitted in the engagement groove 6b. Here, the fixed seat 6a is a flat surface, and the back surface of the clamp gate 12 covering the fixed seat 6a is not restricted in the left-right direction or the up-down direction in FIG. . For this reason, the transmission point of the acting force between the rest bar 6 and the clamp gate 12 can be limited only to the engaging block 12c and the engaging groove 6b, and the acting force due to the biting of the steel piece and other impacts Can be concentrated on these engagement blocks 12c. Therefore, when a large impact is applied to the rest bar 6 or a load is repeatedly applied to the rest bar 6 for some reason, the engagement block 12c and the engagement groove 6b are damaged earlier than other portions. On the other hand, since the upper chock 2 is not provided with the engagement groove as shown in the conventional example of FIG. 6, there is no portion where the load is concentrated at the connection portion with the rest bar 6, and the upper chock 2 itself is damaged. I do not receive. The same applies to the engagement block 12c disposed at the right end and between the clamp gate 13 on the lower roll 5 side and the rest bar 7. From the above, the clamp gates 12, 1
Even if the connecting portions between the lock bars 3 and the rest bars 6 and 7, that is, the engagement blocks 12c and 13c and the engagement grooves 6b and 7b are damaged, only these members need to be replaced, and the upper and lower chocks 2 and 3 are taken off-line. There is no need to repair it. Also, for maintenance and inspection or reassembly of the guides 8, 9, the rest bars 6, 7 can be removed from the upper and lower chocks 2, 3 only by opening the clamp gates 12, 13. Therefore, the guides 8 and 9 can be replaced while the upper and lower chocks 2 and 3 and the rolls 4 and 5 are set in the housings 1a and 1b in a rolled state, and the line stop time is also reduced. Further, even if the rest bars 6 and 7 are deformed, they can be easily removed, so that the cutting and removing work with a gas cutting machine or the like as in the related art is unnecessary, and the surfaces of the upper and lower rolls 4 and 5 are not required. It doesn't hurt you. According to the present invention, the clamp gate and the rest bar are damaged by an impact or the like so as not to damage the choke side at all. There is no need to replace or prepare a spare for the replacement, and the replacement of the guide can be easily performed, thereby preventing a reduction in the operating rate of the line. Further, since the work of attaching and detaching the rest bar can be performed only by opening and closing the clamp gate, the work in the rolled state with the roll in the housing set as it is can be performed, and the rolling operation efficiency can be further improved. .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cutaway front view showing a main part of a rolling mill provided with a guide adjusting mechanism of the present invention. FIG. 2 is a longitudinal sectional view taken along line AA of FIG. FIG. 3 is a cutaway plan view of FIG. 1, showing the incorporation of an upper roll in the left half and a lower roll in the right half. FIG. 4 is a cutaway front view showing a connection structure of a rest bar to a chock. FIG. 5 is a cutaway plan view of a main part showing a connection structure between a clamp gate and a rest bar. FIG. 6 is a cutaway plan view of a main part showing a conventional structure. [Description of Signs] 1a: Housing 1b: Housing 2: Upper chock 3: Lower chock 4: Upper roll 5: Lower roll 6: Rest bar 6a: Fixed seat 6b: Engagement groove 7: Rest bar 7a: Fixed seat 7b: Engage Groove 8: Guide 9: Guide 10a: Bolt 10b: Lifting nut 11a: Fixing bolt 11b: Liner 12: Clamp gate 12a: Pin 12b: Bolt 12c: Engagement block 12d: Mounting bolt 13: Clamp gate 13a: Pin 13b: Bolt 13c: engagement block 13d: mounting bolt

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 1-127604 (JP, U) JP-B 53-25827 (JP, B2) (58) Fields surveyed (Int. Cl. ⁷ , DB name) B21B 39/14 B21B 39/16

Claims (1)

(57) [Claims 1] Rolling in which a guide for guiding a rolled material between upper and lower rolls held by upper and lower chock is connected to a rest bar which can be raised and lowered by the upper and lower chock, respectively. Machine, the end of the rest bar in the longitudinal direction
A flat fixed seat is formed on the opposite side of the surface facing the rolling roll, and an engaging groove that runs in the vertical direction is formed in a portion included in the fixed seat, and the fixed seat is formed on the chock. A clamp gate which is rotatable to open and close the surface of the fixed seat and is capable of covering the fixed seat and capable of restraining the fixed seat in the chocking measurement is connected to the clamp gate, and the clamp gate is fitted in the engagement groove. A guide adjustment mechanism for a rolled material in a rolling mill having an engagement protrusion.