JPH0413404A - Distribution reduction gear for tandem mill - Google Patents

Abstract

PURPOSE:To simplify a structure by arranging an intermediate pinion engaging with roll driving gears between the roll driving gears set to roll driving shafts of adjacent rolling stands and connecting an intermediate shaft providing this intermediate pinion with the above input shaft through a pair of bevel gears. CONSTITUTION:When the input shaft 10 is rotated and driven by a driving device, the intermediate shaft 13 is rotated through a pair of bevel gears 11, 12 and a roll driving gear 15 at an adjacent rolling stand is rotated and driven by one intermediate shaft 13. The reduction ratio is determined by the number of teeth of the bevel gears 11, 12, the intermediate pinion 14 and the roll driving gear 15. Since the reduction ratio can be set to every adjacent rolling stand, the reduction ratio can be set easily. Further, since the roll driving gear 15 for the adjacent rolling stand is driven by one intermediate pinion, the structure can be simplified. Consequently, gears, bearings, etc., used normally can be used, a reduction gear excellent in maintainability can be obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a distribution reducer for a rolling mill in which a plurality of rolling stands are arranged in tandem, such as a 40-1 tandem rolling mill used for wire rod rolling. It is.

[Prior art]

In rolling relatively small diameter wire rods, a billet obtained by blooming or continuous casting is sequentially rolled by a rough rolling mill group, an intermediate rolling mill group, and a finishing rolling mill group, and then the diameter is reduced by wire drawing in a separate process. The wire rod is obtained by gradually reducing the size of the wire. There are various methods for this wire drawing method, such as the die method, but in recent years, a 40-inch tandem rolling mill has been developed that has the advantages of being able to produce products with high speed, high accuracy in outer diameter dimensions, and preventing the material from collapsing. (For example, Japanese Patent Application Laid-Open No. 63-1
68202, Japanese Utility Model Application Publication No. 188845).

This 40-ru tandem rolling mill has 4 rolls around the pass line.
Discontinuous circular grooves are formed on the pass line by arranging several groove rolls, and rolling stands incorporating such groove rolls are arranged in tandem so that each circular groove becomes gradually smaller. At each rolling stand, at least one grooved roll is rotationally driven to feed the wire and continuously roll the wire through the circular grooves. In addition, so that the unrestricted portion of the wire due to the discontinuous circular hole shape does not coincide with each rolling stand, the phase of the rolls is different between adjacent rolling stands. ) and tilted stands (hereinafter referred to as V-stands) in which the roll drive shaft is tilted downward at 45° are arranged alternately.

Such a 40-1 tandem rolling mill requires a distribution reducer to drive the roll drive shafts of each rolling stand in synchronization, but since 40-1 tandem rolling mills have not been put to practical use, the distribution reducer There is no conventional technology, and the third
A general distribution reducer as shown in Fig. 4 was considered.

What is shown in FIG. 3 is that the electric motor 1 and the V/H distribution reducer 2 are arranged at the center of the stand distribution reducer 3 in the pass line direction, and each gear 50 provided on the roll drive shaft 16 is connected to an idle gear 51.
The central gear 50 is rotated by an input shaft 52. V/)l is distributed by gear 53,
This is done using an idle gear 54 and a pair of bevel gears 55 and 56.
■The stand distribution gear train of stand 5 has the same configuration as H stand 4. (Hereinafter referred to as Plan A) Figure 4 shows an electric motor 1 and a V/H distribution reducer 2 arranged on the pass line entrance side of the stand distribution reducer 3, and an input along the pass line to the stand distribution reducer 3. A shaft 10 is provided, and this input shaft 10 and each roll drive shaft 16 are connected to a gear 57.5.
8 and a pair of bevel gears 59 and 60 to rotate the input shaft 10. The V/H distribution reducer has a drive binion 6 and a driven gear 7H.

Consisting of 7 ■, the stand distribution gear train of stand 5 is H
It has the same configuration as stand 4. (Hereinafter referred to as plan B) [Problems to be solved by this invention] In the case of the reduction gear structure as described above, there are the following problems.

(i) Each rolling stand performs rolling at a predetermined reduction rate, but each rolling stand has a different rolling speed, and the rolling speed of the exit side rolling stand is faster than that of the entry side rolling stand Therefore, it is necessary to set the gear ratio according to the different rolling speeds for each rolling stand, but in Plan A, since the gears 5051 are continuous, it is difficult to set the gear ratio.

(ii) Plan A has a structure in which the gear 50 at the center of the pass line is rotated and rotational force is sequentially transmitted to the gears 50 on both sides, so the gear 50 closest to the electric motor 1 requires stronger gears, shafts, and bearings. This increases costs and makes parts incompatible.

(iii) With BE, although it is easy to set the gear ratio, the number of gears in the stand distribution reducer increases, making the structure complex, increasing costs, and causing problems in maintainability and the like.

This invention was made in view of the above-mentioned circumstances, and its purpose is to easily set the reduction ratio for each rolling stand in a common dry fixed gear ratio distribution reducer, and to have a simple structure. The purpose of the present invention is to provide an inexpensive distribution reducer for a tandem rolling mill.

[Means to solve the problem]

As shown in FIG. 1, the present invention includes an input shaft 10 arranged parallel to a pass line L and rotationally driven by a drive device, and a roll drive of each rolling stand arranged in tandem in the direction of the pass line. In a common dry gear fixed type tandem rolling mill distribution reducer equipped with a gear train connecting a shaft 16 and the input 10, a roll drive gear 15 is attached to the roll drive shaft 16, and the roll of an adjacent rolling stand is connected to the roll drive gear 15. An intermediate pinion 14 that meshes with these gears is disposed between the drive gears 15 of the rolls of the drive shaft 16, and the intermediate shaft 13 on which the intermediate pinion 14 is provided and the input shaft 10 are connected by a pair of bevel gears 11.12. They are connected.

[For production]

When the input shaft 10 is rotationally driven by the drive device, the intermediate shaft 13 is rotated via a pair of bevel gears 11 and 12, and the roll drive gears 15 of adjacent rolling stands are rotationally driven by the single intermediate shaft 13. Ru.

The reduction ratio is determined by the number of teeth of the bevel gears 11, 12, intermediate pinion 14, and roll drive gear 15, and since the reduction ratio can be set for each adjacent rolling stand, it is easier to set the reduction ratio than in Plan A. Become. Furthermore, since the roll drive gears 15 of the adjacent rolling stands are driven by one intermediate pinion 14, the structure can be made simpler than Plan B.

[Example] The present invention will be described below based on an illustrative example. This is an example of a 40 mm tandem rolling mill for small diameter wire rods, and as shown in FIGS. 1 and 2, the roll drive shaft 16H
A total of 24 H-stands 4 whose rolls are horizontal and (2) stands 5 whose roll phases are different by 45 degrees and whose roll drive shafts 16V are inclined downward by 45 degrees are arranged alternately and in tandem in the pass line direction.

A stand distribution reducer 3 is arranged along the pass line L on the side of such a tandem stand group, and an electric motor 1 and a V/H distribution reducer 2 are installed on the pass line entrance side of the stand distribution reducer 3. .

The V/H distribution reducer 2 and stand distribution reducer 3 include
Driven gears 7H, 7V and input shafts 10H, IOV are provided at positions corresponding to the roll drive shafts 16H, 116V, respectively. Output shafts 8H, 8V are attached to the driven gears 7H, 7V, and the output shafts 8H, 8V and input shafts are attached to the driven gears 7H, 7V. The shafts 10H and 10V are connected by shaft couplings 9H and 9V. Driven gear 7H.

A drive pinion 6 rotated by the electric motor 1 is disposed between 7V and the input shafts 10H and IOV are rotated in the same direction in synchronization. Note that in this embodiment, the V/H distribution reducer 2 and stand distribution reducer 3 are separated;
It may be a monolithic structure.

The H stand 4 will be explained below, but ■Stand 5
The same applies to The input shaft 10H is disposed in the stand distribution reducer 3 in parallel with the pass line L, is rotatably supported by a bearing 18 provided on the frame 19 so as to separate two adjacent H stands 4, and is roll driven. The shafts 16H are rotatably provided on the reducer frame 20 on the stand side, are perpendicular to the input shaft 10H, and are arranged as a pair in the pass line direction between the bearings 18.

In such a configuration, the input shaft 1 between the bearings 18
Attach bevel gear 11H to the drive device side of 0H, and input shaft 1
An intermediate shaft 13H orthogonal to 0H is disposed at the center between the bearings 18 and between the pair of roll drive shafts 16H. This intermediate shaft 13H is rotatably attached to the reducer frame 20, a bevel gear 12H meshing with the bevel gear 11H is attached to the end on the input shaft side, and an intermediate pinion 14H is attached to the end on the stand side.

A roll drive gear 15H is attached to the roll drive shaft 16H between the reduction gear frames 20, and an intermediate pinion 14H is arranged between the roll drive gears 15H so that the roll drive gears 15H can be rotated in synchronization in the same direction. do. The roll drive shaft 16H is connected to the roll housing 21H via a detachable coupling 17H and rotates the grooved roll 22H.

The reduction ratio is bevel gear 11H, 12H1 intermediate pinion 14
H, determined by the number of teeth Z of the roll drive gear 15H, (
ZII/Z, 2) and (Z14/Z15), and in the pair of rolling stands 4, the roll drive gear 15 on the exit side
Different rolling speeds can be obtained by reducing the number of teeth on H. Further, by making the numbers of teeth of the bevel gears 11H, 12H, intermediate pinion 14H, and roll drive gear 15H different for each pair of rolling stands, the rolling speed can be increased toward the exit side.

In addition, four grooved rolls 22H are rotatably supported by the roll housing 21H, and at least one of the grooved rolls 22H is configured to be rotationally driven. Further, the roll housing 21H is removably disposed on the pedestal 23H, and can be firmly fixed by a clamp device 25H that is rotated and raised and lowered by a clamp cylinder 24H.

In addition, although the above description has been made regarding a 40 mm tandem rolling mill for small diameter wire rods, it goes without saying that the present invention can also be applied to other tandem rolling mills such as a multi-roll tandem rolling mill and a stretch reducer for pipe manufacturing.

〔Effect of the invention〕

As mentioned above, in the distribution reducer for a tandem rolling mill according to the present invention, the roll drive shafts of adjacent rolling stands are rotated by an intermediate shaft having a pair of bevel gears and an intermediate pinion, so that it is easy to set the reduction ratio. In addition, commonly used gears, bearings, etc. can be used, the structure can be simplified, and a reduction gear with good maintainability can be obtained at low cost.

[Brief explanation of drawings]

FIG. 1 is a partially sectional plan view showing an embodiment of the present invention, FIG. 2 is a sectional view taken in the direction of the ■ arrow in FIG. 1, FIGS. 3 and 4 are conventional examples, and (i) is a schematic plan view. (ii) is a schematic cross-sectional view. 1...Electric motor, 2...V/H distribution reducer, 3...
...stand distribution reducer, 4,5...40-le stand, 6...drive pinion, 7...driven gear, 8...output shaft, 9... Shaft coupling, 10...
・Input shaft, lL12...Bevel gear, 13...Intermediate shaft, 14...Intermediate pinion, 15...Roll drive gear, 16...Roll drive shaft, 17...・Detachable coupling diagram

Claims (1)

[Claims] (1) An input shaft (10) arranged parallel to the pass line and rotationally driven by a drive device, and a roll drive shaft (16) of each rolling stand arranged in tandem in the direction of the pass line.
) and the input shaft (10), a roll drive gear (15) is attached to the roll drive shaft (16) to drive the rolls of an adjacent rolling stand. Between the roll drive gears of the shaft, there is an intermediate pinion (1
4), and the intermediate shaft (13) on which the intermediate pinion (14) is provided and the input shaft (10) are connected by a pair of bevel gears (11) and (12). Distribution reducer for rolling mills.