JPH043700Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" The invention is for rolling forming a deformed steel bar in which vertical ribs extending in the longitudinal direction are formed and horizontal ribs are formed at predetermined intervals in the longitudinal direction. The present invention relates to a rolling roll device, and particularly relates to a rolling roll device that has excellent durability and allows the inner surface of the caliber portion to be reground many times.

"Prior Art" Figures 6 to 8 show deformed steel bars that are generally available on the market. This deformed steel bar B ₀ has vertical ribs R ₁ extending in the longitudinal direction and provided at positions shifted by 180 degrees, and horizontal ribs R ₂ provided at predetermined intervals in the longitudinal direction. Such deformed steel bar B ₀ is usually
It is formed by hot rolling using a rolling roll device as shown in FIG.

Briefly explaining an example of a conventional rolling roll device shown in FIG. 5, reference numerals 1 and 1 in the figure are arranged so that their rotational axes are parallel to each other, and are rotationally driven by a drive source (not shown). A pair of rolling rolls 1 are shown, and these rolling rolls 1 are as follows:
a shaft 2, a bellows spring 4 fitted onto the shaft 2 in abutting contact with a collar 3 provided at one end of the shaft 2; It consists of a left spacer ring 5, a roll ring 6, a right spacer ring 7, and a nut 8 which is inserted between them and the collar 3 to fix them.

An annular groove 9 having a substantially semicircular cross section is formed on the outer periphery of the center portion of the roll ring 6, and lateral grooves 10 are formed on the inner surface of the annular groove 9 at predetermined intervals in the circumferential direction.
A caliber portion 11 is formed by the annular groove 9 and the lateral groove 10.

According to the above-mentioned rolling roll device, rolling roll 1,
By forcibly rotating the steel bar 1 and supplying material between the caliber parts 11 and 11 of the roll ring 6 in this state, the deformed steel bar B ₀ shown in Figs. 6 to 8 can be continuously rolled and formed. I can do it.

"Problems to be solved by the invention" By the way, in the above-mentioned rolling roll device, the caliber portion 11 of the roll ring 6 is
The inner surface of the roll ring 6 will wear out, but reducing the amount of wear will extend the life of the roll ring 6, which in turn will lead to a reduction in running costs.

Therefore, recently, the roll ring 6 has been made of cemented carbide or powdered high-speed steel that has excellent wear resistance. However, although such materials have high hardness, they have the disadvantage of being brittle and easily breaking. especially,
When the above-mentioned deformed steel bar B ₀ is used as the roll ring 6 for rolling, the lateral groove 1 of the caliber part 11
Since the stress is concentrated at 0, the above-mentioned drawback becomes noticeable.

The present invention was devised in view of the above circumstances, and provides a rolling roll device that is highly durable and allows the inner surface of the caliber portion of the roll ring to be reground many times, thereby reducing running costs. The purpose is to

"Means for Solving the Problems" In the present invention, a roll ring is divided into two parts in advance, and an annular groove having an arcuate cross section is formed on the outer periphery of the mating parts of the roll ring halves that are opposed to each other. , the annular grooves are butted against each other to form a caliber portion having a semicircular cross section.

"Embodiment" Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 4. In this embodiment, the same components as those of the conventional example are given the same reference numerals to simplify the explanation.

In this rolling roll device, two roll ring halves 20 and 21 are fitted on the outer periphery of both shafts 2, sandwiched between spacer rings 5 and 7, and overlapped in the longitudinal direction of the shaft 2. ing. And these two roll ring halves 2
0 and 21 constitute a roll ring 22.

The roll ring halves 20 and 21 have a symmetrical shape, and an annular groove 23 having an arcuate cross section is formed on the outer periphery of the mating portions facing each other. Furthermore, lateral grooves 24 are formed at predetermined intervals in the circumferential direction on the inner surface of the annular groove 23 of both roll ring halves. Although the lateral groove 24 is provided so as to extend orthogonally to the center line of the annular groove 23 here, it is not necessarily necessary to do so, and may be arranged so as to intersect the center line at a predetermined angle. . Furthermore, the corners of the outer peripheries of the mating parts of both roll ring bodies 20, 21 are chamfered, so that when the roll ring halves 20, 21 are brought together, the annular groove 23, lateral groove 24, etc. A vertical groove 26 is formed in the center of the caliber portion 25.
The roll ring halves 20 and 21 are made of cemented carbide or powdered high-speed steel that has excellent wear resistance.

Next, a case will be described in which the deformed steel bar _B1 is rolled using the rolling roll device having the above configuration.

The positions of both rolling rolls 1, 1 are adjusted so that a slight gap H is formed between the roll rings 22, 22 facing each other, and in this state, these rolling rolls 1, 1 are forcibly rotated, Material is supplied between the caliber parts 25 of both rolling rolls 1,1.
Thereby, the deformed steel bar _B1 can be continuously rolled and formed as shown in FIGS. 2 to 4.

Here, in the roll device having the above configuration, since the roll ring 22 is divided in advance, the stress does not concentrate in the deep part of the caliber part 25 and breakage occurs, which occurs in the conventional example, and the roll ring 22 Increases durability. In addition, in this embodiment, by chamfering the corners of the outer periphery of the mating portions of the roll ring halves 20 and 21, stress is prevented from concentrating there. Durability can be increased.

Furthermore, when re-polishing the roll ring 22, the conventional method removes roughened and worn parts on the inner surface of the caliber part 25 by performing the process shown by the two-dot chain line in FIG. 5, creating a new roll surface. In this example, polishing can be performed not only in the radial direction but also in the direction of the mating surfaces of the roll ring halves 20 and 21, that is, in the axial direction (Y direction) of the roll ring 22. The amount of radial polishing required is less than that of conventional methods. As a result, the number of times of re-polishing can be increased, and from this point of view the life of the roll ring can be extended.

Further, in the deformed steel bar B ₁ formed by this rolling roll device, vertical ribs R ₁ extending in the axial direction are formed at every 90 degrees in the circumferential direction. This is because a slight gap H is formed between the rolling rolls 1 and a vertical groove 26 is formed between the mating portions of both roll ring halves 20 and 21. As a result of experiments, the deformed steel bar B ₁ formed by this rolling roll device has higher bending strength than conventional bars.
I found that it was up by 10-30%.

"Results of the Invention" As explained above, the present invention provides the following excellent effects.

Because the roll ring is divided into two parts in advance, it prevents the problems that occur in conventional rolling roll equipment, where stress concentrates in the center of the caliber part of the roll ring and causes it to break. I can do it.

When re-polishing the roll surface to remove rough and worn parts and form a new roll surface, polishing can be done not only in the radial direction but also in the direction along the axis of the roll ring, so the amount of polishing from the radial direction can be reduced. It requires less than the conventional type, and as a result, the life of the roll ring can be extended.

In particular, since the roll ring is made of expensive materials such as cemented carbide or powdered high-speed steel, extending the life of the roll ring as described above will lead to a significant reduction in running costs.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a rolling roll device according to the present invention, FIGS. 2 to 4 show a deformed steel bar formed by the rolling rolling device, and FIG. 2 is a side view.
Fig. 3 is a plan view, Fig. 4 is a sectional view taken along the - line in Fig. 2, Fig. 5 is a longitudinal sectional view showing an example of a conventional rolling roll device, and Figs. The sixth figure shows a deformed steel bar formed by a roll device.
The drawings are a side view, FIG. 7 is a plan view, and FIG. 8 is a sectional view taken along the line - in FIG. 6. 1... Roll, 2... Shaft, 20,2
DESCRIPTION OF SYMBOLS 1... Roll ring half body, 22... Roll ring, 23... Annular groove, 24... Horizontal groove, 25... Caliber part, 26... Vertical groove, _B1 ... Deformed steel bar.

Claims (1)

[Scope of utility model registration request] Roll rings are fitted to the outer peripheries of both shafts whose rotational axes are parallel to each other, and annular grooves having a substantially semicircular cross section are formed on the outer peripheries of the roll rings, and grooves are formed on the inner surface of the annular grooves at predetermined intervals in the circumferential direction. In a rolling roll apparatus, a caliber part is formed with a horizontal groove provided, and a material is sandwiched between the caliber parts and extruded to form a deformed steel bar in a desired shape by rolling. The ring halves are fitted in an overlapping state in the longitudinal direction of the shaft, and annular grooves each having an arcuate cross section are formed on the outer periphery of the mating portion of these roll ring halves, and an annular groove is formed on the inner surface of these arcuate annular grooves. A rolling roll device for deformed steel bars, characterized in that horizontal grooves are formed and annular grooves are butted against each other to form the caliber portion.