JP4291766B2 - Double-end rolling mill - Google Patents

Description

  The present invention relates to a double-end rolling mill for rolling steel bars, strips, wire rods, and the like. Specifically, both ends of a pair of upper and lower work rolls are respectively supported by bearing housings, and upper and lower bearings at both ends thereof are supported. The present invention relates to a so-called housingless rolling mill having a structure in which housings are directly connected by tie rods.

  A typical both-end rolling mill is composed of a roll, a bearing housing, a roll stand (housing), a reduction device, and a driving device, which is the most popular rolling mill with a simple structure. On the other hand, as another type of rolling mill, there is a rolling mill in which upper and lower bearing chocks are directly connected by tie rods. This rolling mill is a compact rolling mill that can omit the roll stand. This type of type is called a housingless rolling mill. The present invention relates to this housingless rolling mill, and is disclosed, for example, in JP-A-11-169924 (Patent Document 1).

  What is disclosed in Patent Document 1 has at least a pair of rolling cylinders (12, 13) attached to a stand (14, 15), as described in the claims, and the rolling cylinder (12 , 13) The gap (working gap) (17) between them is adjusted by a system consisting of the screw (18) and the lead screw (21), and the hydraulic preload system of the rolling cylinder works after adjusting the gap (17). In the rolling cage for manufacturing hot-rolled steel bars of the above type, the hydraulic preload system of the rolling cylinders (12, 13) crosses the stand (14, 15) in a state in which relative sliding movement is possible. Each rod (27) has one end (28) firmly attached to the stand (14) and the other end on the opposite side of the stand (14). A piston (29) provided movably in a hydraulic cylinder (30) attached to a cylinder (15), and a rod (27) is a cage configured to function to counter rolling torque. is there.

  By the way, in general, a rolling mill generates a rolling load by rolling, and the roll gap of the work roll changes slightly. When this mill rigidity is low, rolling load fluctuates due to uneven rolling temperature, and material dimensions after rolling also change. When the product is finished in the final pass of rolling, a product with good quality (product dimensional accuracy) cannot be produced if the mill rigidity is low.

  On the other hand, in order to increase the rigidity of the rolling mill (mill rigidity), it is necessary to increase the rigidity of the part that is elastically deformed during rolling. However, if the member is unnecessarily large, the economy is inferior. A high rolling mill is required.

However, in the rolling mill disclosed in Patent Document 1, the stand (14) and the stand (15) are connected by a plurality of rods (27) extending across the stands (14, 15), whereby the housingless rolling mill structure However, since the preloading device including the rod (27) and the hydraulic cylinder (30) and the reduction device including the screw (18) and the lead screw (21) are separately provided, a compact configuration is provided. In addition to being inferior in productivity, it is also inferior in economic efficiency, such as hindering equipment cost increase and shortening of the rolling line. Although preload is applied, the distance from the roll center of the work roll to the reduction screw is long, and the distance between the upper and lower screws is also long, so the effect of improving the mill rigidity is small.
JP-A-11-169924

  The present invention is based on the above circumstances, and an object of the present invention is to provide a double-end rolling mill that is compact, has high rigidity, and can be preloaded.

In order to achieve the above-mentioned object, the two- sided rolling mill according to the present invention (Claim 1) is provided on the stand frame, two each on the drive side and the work side at regular intervals along the rolling line. In a double-end rolling mill in which a bearing housing in which upper and lower rolling rolls are mounted on both sides is slidably accommodated between a drive-side guide stand and a work-side guide stand , , the upper and lower bearing housing of the drive side and work side incorporating the bearing rolling roll tie rod penetrates each hydraulic cylinder is provided respectively on either end side of and below the tie rod, the drive side and work side arranged roll gap adjusting means for adjusting the gap between the rolling rolls in an intermediate position of the upper and lower bearing housing of each addition, the roll gap to adjust Is engaged with the stage to the tie rod, the driving means for rotating the tie rod is provided, said upper and lower bearing housing becomes slidably secured to the tie rod, the roller gap adjusting means, the central portion of the tie rod A spline shaft that is provided, a spline that meshes with the spline shaft is formed on the inner peripheral surface, a screw that is formed with a screw on the outer peripheral surface, a spline that meshes with the spline shaft is formed on the inner peripheral surface, and the spline shaft that is formed on the outer peripheral surface. The upper screw and the lower screw are formed on the reverse screw, and the upper and lower screws are formed on the reverse screw so as to be screwed on the upper and lower screws, and the nut is formed on the outer periphery so that the flange portion is formed. By rotating the tie rod, the upper and lower bearing housings on the drive side and work side can slide in the vertical direction. , And the flange portion formed to protrude to the outer periphery of the nut is made provided so as to be secured to the respective inner central portion of the drive side and work side guide stand.

In the above configuration, the tie rod is provided so as to be engaged with the roll gap adjusting means, and the roll gap adjusting means is disposed at an intermediate position between the upper and lower work rolls, so that the distance from the center of the work roll to the reduction means is short. Thus, the rigidity of the bearing housing can be increased and the compact rolling mill can be configured. Further, since the tie rod is rotated by the driving means, it can be used as a driving source for the rolling-down means (roll gap adjusting means), and a plurality of pairs of tie rods can be easily operated by a single driving means through a power transmission mechanism. it can. Further, the rolling-down means (roll gap adjusting means) is disposed in the center of the rolling mill, but the driving means is installed above the rolling mill with a good equipment environment. Further, is provided with the hydraulic cylinders on either end side of the upper and lower tie rod, the hydraulic cylinder with greater thrust than rolling load can be applied to pre-load between the tie rod end and the bearing housing, the screw looseness It can be eliminated before rolling, and the spread of gaps (mill jump) due to rolling can be suppressed.

  As described above, according to the double-end rolling mill according to the present invention, it is possible to provide a rolling mill that has a compact configuration and can increase rigidity and can be preloaded.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a left half sectional side view of a double-end rolling mill according to the present invention, and FIG. 2 is a plan view excluding the tie rod driving device of FIG. In the following description, the drive side refers to the side that connects the work roll to a drive motor (not shown), and the work side refers to the non-drive side.

  In the rolling mill, two drive-side guide stands 2 and two work-side guide stands 3 are erected on the stand gantry 1 on the drive side and the work side at regular intervals along the rolling line. Between the two drive side guide stands 2 and between the two work side guide stands 3, the upper and lower work rolls 4, 5 slide up and down on bearing housings 6 to 9 attached to both sides. It is configured to be accommodated and provided.

  The drive side guide stand 2 has a frame structure having a substantially T-shaped cross section, and a receiving base 10 for fixing a nut 27 to be described later is fixed to an inner central portion in the vertical direction. In addition to the frame structure having the same structure as that of the drive side guide stand 2, the work side guide stand 3 moves the work rolls 4 and 5 in the axial direction at the end of the frame having a substantially T-shaped cross section. A frame plate 13 for pressing and fixing the presser plate 11 for regulating with the presser bolt 12 is provided.

  The drive-side bearing housings 6 and 8 and the work-side bearing housings 7 and 9 have the same structure. The housing main body 14 and a flange having through holes 15 on the front and rear surfaces of the housing main body 14 in the rolling direction. The bearings (bearings) which are configured to include the parts 16 and 17 and are attached to the shafts on both sides of the work rolls 4 and 5 are accommodated in the housing main body 14 and attached to the shafts on both sides of the work rolls 4 and 5. It is done.

  The upper work roll 4 to which the drive-side bearing housing 6 and the work-side bearing housing 7 are attached as described above, and the lower work roll 5 to which the drive-side bearing housing 8 and the work-side bearing housing 9 are attached are arranged in front of and behind the housing body 14. After inserting the through holes 15 of the provided flange portions 16 and 17 from the upper side and the lower side of the tie rod 19 provided with the roll gap adjusting means 18 at the center portion, the front and rear flange portions 16 and 17 of the lower work roll 5 are inserted. On the lower surface side, a washer 20 and double nuts 21 and 22 are provided and fixed. On the other hand, the upper surface side of the front and rear flange portions 16 and 17 of the upper work roll 4 is the same after a preloading hollow hydraulic cylinder 23 is further provided. A washer 20 and double nuts 21 and 22 are provided and fixed to each other. Thereby, the setting of the upper and lower work rolls 4 and 5 is performed.

  In this example, the roll clearance adjusting means 18 provided at the central portion of the tie rod 19 includes a spline shaft 24 provided at the central portion of the tie rod 19 and a spline that meshes with the spline shaft 24 on the inner peripheral surface. An upper screw 25 having a left-hand thread, a spline meshing with the spline shaft 24 on the inner peripheral surface, a lower screw 26 having a right-hand screw formed on the outer peripheral surface, and upper and lower screws 25 and 26, It is comprised with the nut 27 screwed together in each lower. Then, the flange portion 28 formed so as to protrude from the outer periphery of the nut 27 is provided with the fixing bracket 29 and the cotter 30 interposed between the receiving base 10 provided at the inner central portion of each of the drive side guide stand 2 and the work side guide stand 3. It is configured to be fixable.

  The rolling mill is assembled as follows. First, a roll assembly in which the upper and lower work rolls 4 and 5 are set by the tie rods 19 as described above is provided with two drive side guide stands 2 and two work side guide stands 3 which are erected on the stand frame 1. It is inserted from above into the interior space. Next, the work rolls 4 and 5 are restricted from moving in the axial direction by the presser plate 11 and the presser bolt 12 provided on the frame plate 13 of the work side guide stand 3, and formed so as to protrude from the outer periphery of the nut 27. The flange portion 28 is fixed to the cradle 10 provided at the inner center portion of each of the drive side guide stand 2 and the work side guide stand 3 with a fixing bracket 29 and a cotter 30 interposed therebetween, and further to the upper end portion of the tie rod 19. The tie rod driving device 31 is connected and assembled. The tie rod drive device 31 may be driven by providing a drive motor for each of the four tie rods 19 or may be driven by a single drive motor with a power transmission mechanism interposed. Also good.

  In the rolling machine having the above configuration, the rolling means (roll gap adjusting means) 18 is provided at the center of the tie rod 19 (the height position between the upper work roll 4 and the lower work roll 5). The distance from the center to the rolling-down means 18 is short, and the rolling mill itself has a compact structure as the rigidity of the bearing housings 8 and 9 is increased. In addition, the rolling-down means (roll gap adjusting means) 18 is disposed at the center of the tie rod 19, but the driving device 31 is installed above the rolling mill having a good equipment environment and is easy to perform maintenance work. Further, since the preload hydraulic cylinder 23 is provided on the upper end side of the tie rod 19, preload can be applied between the end of the tie rod 19 and the bearing housings 8 and 9 with a thrust larger than the rolling load.

It is a left half section view side view of the double-end rolling mill concerning the present invention. It is a top view shown except a tie rod drive device of FIG.

Explanation of symbols

1: Stand frame 2: Drive side guide stand 3: Work side guide stand 4: Upper work roll 5: Lower work roll 6, 8: Drive side bearing housing 7, 9: Work side bearing housing 10: Receiving base 11: Presser plate 12: Presser bolt 13: Frame plate 14: Housing body 15: Through hole 16, 17: Flange 18: Roll gap adjusting means 19: Tie rod 20: Washer 21, 22: Nut 23: Hydraulic cylinder 24: Spline shaft 25: Top Screw 26: Lower screw 27: Nut 28: Flange 29: Fixing bracket 30: Cotter 31: Tie rod drive device

Claims (1)

On the stand frame, upper and lower rolling rolls are respectively provided between the drive side guide stand and the work side guide stand that are set up two by two on the drive side and the work side at regular intervals along the rolling line. In a double -end rolling mill that accommodates bearing housings mounted on both sides in a vertically slidable manner,
Tie rods pass through the upper and lower bearing housings on the drive side and work side that incorporate the rolling roll bearings, respectively , and hydraulic cylinders are provided on either of the upper and lower ends of the tie rod, respectively . Roll gap adjusting means for adjusting the gap between the rolling rolls is provided at the middle position between the upper and lower bearing housings, respectively , and further provided with driving means for rotating the tie rod while engaging the roll gap adjusting means with the tie rod , The upper and lower bearing housings are slidably fixed to the tie rods ,
This roll gap adjusting means includes a spline shaft provided at the center of the tie rod, a spline that engages with the spline shaft on the inner peripheral surface, an upper screw having a screw formed on the outer peripheral surface, and the A spline that meshes with the spline shaft is formed, and an upper screw and a lower screw are formed on the outer circumferential surface of the upper screw and a reverse screw. And by rotating the tie rod, the upper and lower bearing housings on the drive side and work side can be slid in the vertical direction.
A double-end rolling mill characterized in that a flange portion that protrudes from the outer periphery of the nut is provided so as to be fixable to the inner central portion of each of the drive side and work side guide stands .

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