JPS606723B2 - Roll axial movement device of rolling mill - Google Patents

Description

Detailed Description of the Invention Generally, a rolling mill having multi-stage rolling rolls such as four or six stages is used to roll a rolled material, and the work rolls therein are constantly in contact with the rolled material during rolling. Therefore, the contact surface portion of the rolled material is worn out depending on the thickness of the plate.

Generally, rolling rolls are cooled and lubricated by distributing oil-based roll cooling water, but in hot rolling mills and plate rolling mills that use roll cooling water with a small amount of oil, Wear becomes noticeable.

Therefore, when rolling a rolled material using a conventional 4-high or 6-high rolling mill, "LOT rolling" in which a large amount of rolled material b in a particular plate is rolled, the work rolls a, a In this case, abnormal wear (hereinafter referred to as uneven wear) occurs only in the corresponding part of the specific plate as shown in Fig. 1, and excessive wear (particularly in the part that contacts the end of the rolled material b) occurs.
(see Figure 2), such work rolls a, a
For subsequent rolling, it is necessary to grind the roll surface by △○ shown in Fig. 2.

Furthermore, the effect of the corrugation of the roll (see Figure 2) caused by uneven wear of the work roll is on other rolls, for example reinforcing rolls c and c in the case of a 4-high rolling mill, and in the case of a 6-high rolling mill. Transferred to the intermediate roll and reinforcing roll, surface grinding of these rolls is also required.

For this reason, the frequency of roll grinding increases, and the rolling tonnage up to the roll scrapping diameter decreases, significantly worsening the unit consumption of the rolls. Therefore, as a solution to the above-mentioned difficulties, a so-called work roll shift rolling mill has been developed in which the work roll, which is in constant contact with the rolled material, can be moved in the direction of the plate of the rolled material, that is, in the direction of the roll axis. .

This is a rolling mill that can move work rolls in the roll axis direction, and when rolling a lot of rolled material in a specific plate, the work rolls are moved in the roll axis direction and rolling on the work rolls is performed. By appropriately changing the contact portion with the Z material, the work roll is worn evenly. This reduces uneven wear of the rolls and excessive wear at the ends of the rolled material, increases the number of rolling tonnage up to the roll scrapping diameter, and improves the roll consumption rate. Another advantage of moving the work roll in its axial direction is that by moving the work roll in the axial direction, the end of the roll is freed from restraint by other rolls such as reinforcing rolls. , it is possible to fully exhibit the shape modification effect 2 of the rolled material by the hydraulic device for roll shape control.Therefore, various roll axial movement devices for rolling mills that move the work roll in the axial direction have been developed. The following representative technologies are available; however, all of them have drawbacks and require improvement.

2'1} Special Public Service Showa 50-1185y
The one in the publication has a mechanism in which the roll drive shaft is moved by a moving device and the rolls engaged with the roll drive shaft are moved accordingly, but the force generated in the roll axis direction of the work roll during rolling is This has to be carried by the drive shaft and the engagement part between the roll and the drive shaft, making the mechanism large and complicated, and the roll axial force during rolling in conventional rolling mills is received by a highly rigid mill housing. This mechanism is significantly backwards compared to the rational mechanism described above, and if this mechanism were to be applied to an existing rolling mill, a large amount of modification would be required to the existing equipment, making it practically impossible to apply. . [2- The rolling machine disclosed in Japanese Patent Publication No. 53-8541 has a mechanism in which the moving device is housed inside the housing, but the size of the rolling mill in the middle direction is larger than the conventional one, and it is particularly difficult to use the tandem arrangement. In order to improve product quality and equipment costs, the distance between each rolling mill has been shortened, and each part that determines the center direction of the rolling mill has been made compact and arranged to eliminate waste. It is unsuitable for rolling mills, and furthermore, if the mechanism is to be applied to an existing rolling mill, it would be difficult to apply because it would require extensive modification of the existing equipment.
[3' The device disclosed in Japanese Patent Publication No. 55-39405 has a mechanism in which one end of the moving device is rotatably attached to the housing, and when the rolls are changed, the moving device is rotated to secure the space necessary for changing the rolls. However, when changing the rolls, it takes time to rotate the moving device, which increases the time required to change the rolls.Additionally, by rotating the moving device, for example, when moving the moving device using a hydraulic device, it is necessary to rotate the attached hydraulic piping. However, if you try to apply it to an existing rolling mill, it may cause interference with new rolls, which are specially equipped for changing rolls in front of the mill, within the rotating range. etc., which interferes with silk replacement work, and there are problems with its practicality and versatility.

(4) In the Tsubaki Publication No. 54-30658, a guide bar is installed between the roll chock and the housing, and the mechanism is such that the guide bar is moved and the roll engaged with the guide bar is moved accordingly. In addition, the guide bar is installed along the roll between the work side housing and the drive side housing, making it difficult to combine the guide bar with equipment inside the rolling mill such as a mill guide, resulting in a complicated mechanism. If an attempt is made to apply this method to an existing rolling mill, it can be said that it is practically impossible to apply it.

Waki: The mechanism disclosed in Japanese Patent Publication No. 55-18162 has a built-in cylinder for roll movement between the chocks, but each chock has a built-in cylinder for roll movement, resulting in high equipment costs and maintenance of the cylinders. The maintenance costs required will be necessary.

Furthermore, when applying the method to an existing rolling mill, the middle dimension of the chock increases, which requires extensive modification of the existing rolling mill, making the application difficult. The present invention provides a roll axial movement device for moving a work roll of a rolling mill in its axial direction.
Focusing on the difficulty of applying it to existing rolling mills, which is a common drawback of conventional equipment as mentioned above, we have developed a system that requires fewer modifications to existing rolling mills, downsizes the equipment, and makes roll rearrangement easier and faster. In order to save time, the equipment was divided into four types, and each was installed separately on the left and right sides of the work roll chock, that is, on the entry and exit sides in the rolling direction. To provide a roll axial movement device for a rolling mill that can move a pair of upper and lower work rolls toward the bag and move the device away from the work roll chock. In the rolling mill equipped with the above-mentioned rolling mill, shifters are provided to engage on both left and right sides of the upper work roll chock and the lower work roll chock, and the left and right shifters on the upper work roll chock side and the left and right shifters on the lower work roll chock side are respectively provided. Each work roll can be moved independently in the axial direction by each drive mechanism, and the upper and lower shifters on the right side and the upper and lower shifters on the left side,
This device is characterized in that the lower shifters are disposed in the housing so that they can be moved in left and right opposite directions by respective drive mechanisms.

Since the present invention has the above-mentioned configuration, the roll koji direction moving device is divided into the left and right sides of the work roll chock, and is miniaturized with a simple mechanism.It is easy to attach to the housing and can be easily attached to an existing rolling mill. In addition, since the upper and lower work rolls can each be moved independently in the axial direction, the axial movement of the upper and lower work rolls can be adjusted as desired, whether in the same direction or in opposite directions. It becomes possible to change the position freely, the tonnage of rolling processing up to the roll waste diameter increases significantly, and the roll consumption rate can be significantly improved.

Furthermore, in the present invention, since the left and right shifters can be moved in opposite directions, the left and right shifters can be moved away from the work roll chock, thereby freeing the work roll chock and securing rearrangement space for easy rearrangement. By moving the left and right shifters to the work roll chock side and engaging them, movement of the work roll in the rolling direction can be prevented and stabilized.

The above effects include providing shifters that engage with the left and right sides of the L upper work roll chock and the lower work roll chock, respectively, and the above upper and lower work roll chocks. - Each roll axis direction drive mechanism that individually moves each shifter in the roll axis direction by individually installing each shifter in each chamber of the left and right shifter guide frames arranged on the left and right sides of the lechok. , and the left and right shifter guide frames, which are disposed in the housing so as to be movable in the left and right directions, are provided with left and right drive mechanisms that move the shifter and the barbs in left and right directions opposite to each other. Although shifters are provided on the left and right sides of the upper and lower work roll chocks, and each shifter is individually movable in the roll axis direction, each roll axis drive mechanism is not operated on the left or right side. It can be arranged compactly in each chamber of the right shifter guide frame, and the shifter guide frame and each shift can be installed in the left,
The device of the present invention can be made into a simple and compact mechanism that moves in opposite left and right directions using a right-hand drive mechanism. , furthermore,
The upper and lower work rolls can be moved significantly, accurately, quickly, and freely in the roll axis direction, and each shift can also be moved left and right along with the left and right shifter guide frames, greatly improving movement operation performance and reliability. It has been improved. Embodiments of the present invention will be described below with reference to FIGS. 3, 4, and 5.

In the figure, 1 and 1' are upper to lower work rolls, 2 is an upper work roll chock t, and 3 is a lower work roll. A roll chock 4 is a housing, and shifters 5, 5 are engaged with the left and right sides of the upper work roll chock 2 (input side and exit side of the rolled material with respect to the work roll), respectively, and shifters 5 and 5 are engaged with the lower work roll chock 3. Shifters 6 and 6 are also installed on the left and right sides (inlet and outlet sides of rolled material), respectively.
are engaged, and the base side of each shifter 5, 5, 6, 6 is formed in a cross-sectional shape and is inserted into each chamber of the shifter guide frame 7 and in the roll axis direction of the work rolls 1, 1'. The tip sides of pistons 9 and 10, which are movably inserted in the saddle and are fixedly installed in each chamber of the shifter guide frame 7 and extend in the roll axis direction of the work rolls 1 and 1' and are installed opposite each other, are connected to each of the above-mentioned Iron is inserted into the base side part of the shifter 5, 5, 6, 6, and the tip side of each piston 9, 10 and each shifter 5, 5, 6
, 6 are formed between hydraulic pressure chambers A and C, and a hydraulic pressure supply mechanism (not shown) supplies hydraulic pressure independently to each hydraulic pressure chamber mouth side of each shifter 5, 5, 6, and 6 or to each hydraulic pressure chamber C side. 0, the left and right shifters 5, 5 on the upper work roll chock 2 side and the left and right shifters 6, 6 on the lower work roll chock 3 side independently shift the work rolls 1, 1 by the hydraulic drive mechanism. ′ has a structure that allows it to move in the direction of the roll. Further, each of the shifter guide frames 7, 7 disposed on the left and right sides of the upper and lower work roll chocks 2, 3 is connected to a base turtle 3, which is fixed to the housing 4 by means such as bolts (not shown). .
Furthermore, each shifter guide frame 7, 7 is movably mounted on the housing 4 side, that is, the base 13, 1.
The hydraulic cylinders 4 and 14 are connected to the piston rods of the hydraulic cylinders 4 and 14 installed on the 3 sides by pins 15 and 15, and both hydraulic cylinders 4 and 14 are simultaneously expanded and contracted by the same amount by a hydraulic pressure supply mechanism not shown. The right shifter guide frame 7, that is, the right upper and lower shifters 5,
6 and the left shifter guide frame 7, the upper and lower shifters 5 and 6 on the left side are arranged in the housing 4 so that they can be moved simultaneously to the left and right in opposite directions by respective drive mechanisms. There is.

Since the illustrated embodiment has the above-described structure, when the upper work roll 1 and the lower work roll 1' in FIG. 3 are simultaneously moved in the roll axis direction, each shifter 5,
6, 6 and each piston 9, 9, 9, 9, each hydraulic pressure chamber is supplied with hydraulic pressure by a hydraulic pressure supply mechanism (not shown), or each shifter 5, 5, 6, 6 and each piston 210, 10, 10, 10 can be moved by any operation of supplying hydraulic pressure to each hydraulic pressure chamber C, H, H, C side formed between each piston 210, 10, 10, 10, In addition, each shifter 5, 5,
6 and 6 have a structure in which they can be moved in the roll axis direction by a single drive mechanism, so hydraulic pressure is applied to the upper shifters 5, 5 and the lower shifters 6, 6 by a hydraulic pressure supply mechanism (not shown). By supplying a
It is possible to freely change the axial rolling positions of the upper and lower work rolls, prevent uneven wear, and has a compact structure, making it easy to attach the housing.

In addition, when performing roll rearrangement, repair, etc., if both hydraulic cylinders 4 and 14 are simultaneously reduced by a hydraulic pressure supply mechanism (not shown), the right shifter guide frame 7 and the right shifter 5, 6 is guided by the base 13 and moved to the right side, and the left shifter guide frame 7, that is, the left shifter 5
, 6 are guided by the base 13 and moved to the left side, and each shifter 5
, 5, 6, and 6 move in the opposite direction and move away from the upper and lower work roll chocks 2 and 3, and the upper and lower work roll chocks 2
, 3 are freed to create space, making it easy to rearrange the rolls and quickly change the silk.

Furthermore, when both hydraulic cylinders 14, 14 are extended in the opposite manner to the above, the left and right shifters 5, 5, 6, 6 engage with and support the left and right sides of the upper and lower work roll chocks 2, 3. Therefore, the movement of the upper and lower work roll chocks, that is, the upper and lower work rolls 1' in the rolling direction can be stopped and stabilized.

Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to such embodiments, and that various design modifications can be made without departing from the spirit of the present invention. .

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is an explanatory diagram of roll wear in a four-high rolling mill, FIG. 2 is an explanatory diagram of local wear in FIG. 1, and FIG. 3 is a side view showing an embodiment of the present invention. Figure 4 is a top view of Figure 3,
The figure is a sectional view taken along the line BB in FIG. 3. 1, 1'...Upper and lower work rolls, 2...Upper work roll chock, 3...Lower work roll chock, 4...Housing, 5, 6...Shifter, 7... ...Shifter guide frame, 9, 10...Piston, 13...・
...Base, 14...Hydraulic cylinder, 15...
...Pin, I...Engagement part, mouth, C...
Hydraulic chamber. Figure 1 Figure 2 Figure 3 Groove Figure 4 Figure 5

Claims (1)

[Claims] 1. In a rolling mill equipped with a roll axial movement device that moves a pair of upper and lower work rolls in the axial direction of the rolls to equalize wear on the rolls, shifters that engage on the left and right sides of the upper and lower work roll jocks are installed. Each shifter is individually fitted into each chamber of left and right shifter guide frames arranged on the left and right sides of the upper and lower work roll jocks, respectively, and the shifters are individually moved in the roll axis direction. and a left and right drive mechanism for moving the left and right shifter guide frames, which are disposed in the housing so as to be movable in the left and right directions, in opposite left and right directions together with the shifter. Features: Roll axial movement device for a rolling mill.