JPS6174720A - Multistep type billet twisting roller device - Google Patents

Abstract

PURPOSE:To provide the titled device of multistep type billet twisting roller enabling the reduction of flaws due to the twisting of a material to be rolled and a low temp. rolling by arranging in series plural units of twisting rollers to conduct the material to be rolled to a roll groove in a horizontal type continuous rolling mill. CONSTITUTION:The material to be rolled is gradually twisted so as to make the twisting reaction force of the material to be rolled about equal by plural units of twisting rollers 8a, 8b, 8c which are arranged in series via the solid guide 6 conducting the material to be rolled and fitted to the next roll groove without varying in upper and lower direction In this case the twisting angle is taken, for instance, about 7 deg. for the roller 8a, about 25 deg. for 8b and about 47 deg. for 8c. The guide 6 is of the structure only for the conduction of the material to be rolled and no twisting is performed. The rollers 8a, 8b, 8c have the V-shaped annual groove rotatably supporting the material to be rolled with a vertical supporting shaft via a bearing and is composed of >=two pieces of rolls pinching the material to be rolled.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to rolled materials (including billets or blooms)
This is a continuous rolling line that performs full rolling (this is a horizontal roll continuous rolling mill equipped with a multi-stage steel billet twisting roller device that guides the billet to the roll hole shape while twisting to change the direction of the rolling force). be.

(Prior art) In general, in the rolling of square steel using a horizontal roll type continuous rolling mill, for example, a group of rolled bars arranged in series are heated in a heating furnace to a temperature that can be rolled, and then rolled in a blooming mill. The material to be rolled is continuously rolled with a r-roll hole in a machine to finish it into a predetermined cross-sectional shape, but after being shaped with a diamond hole, the material to be rolled is rolled at 90 degrees or 45 degrees. It is necessary to twist and guide it.

This torsional induction is usually done by arranging the diamond hole shape of the rolling mill.
This is done by a fixed guide (hereinafter referred to as a solid guide) provided on the exit side of the tube and a set of twisting rollers 7j provided behind it.

(One of the problems with the prior art is that the twisting posture of the conventional rolled material is as shown in Figure 3.) A-23 was twisted by about 37 degrees to 47 degrees and inserted into the primary roll hole mold.

In this method, since twisting is performed using a solid guide, there is strong contact between the inner surface of the solid guide and the material to be rolled, and the material to be rolled receives a large torsional reaction force. (This always results in streak-like flaws (hereinafter referred to as zu-shi flaws). However, the contact surface of the solid guide is covered with fragments of the rolled material (generally defects in the rolled material such as bald spots).
The heat of the rolled material often causes seizure of protrusions,
In such a case, significant scratches occur on the surface of the rolled material. The same goes for one piece of round steel.

In addition, the conventional torsion roller 3 has a cylindrical portion 18 with approximately the same outer diameter as shown in FIG. The structure is such that the rollers face each other (the flange portion 19 faces each other).Therefore, the rolled material 1 is supported at two points in the lateral directions a and a'. However, since the material to be rolled is not sufficiently supported, it may fluctuate in the vertical direction, and folding flaws 4 as shown in FIG. 5 may occur in this portion.

If the support points are increased by reducing the gap with the rolled material, the cylindrical part 18 and the flange part 1
The head of the rolled material may bend in the longitudinal direction due to the difference in the circumferential speed of the rollers.

In order to fully investigate the causes of defects in the conventional method mentioned above,
A defect-free rolled material was produced and rolled using a conventional horizontal roll type continuous rolling mill G trowel. The results are shown in No. 7@. From the figure, as shown in the figure, the rolled material with no defects]
In the conventional method, flaws occur, but these flaws are linear flaws caused by pinholes and rolling.Those caused by rolling are concentrated near the corners, and the longitudinal direction of the rolled material is approximately the same. In a straight line (this is also an open flaw).

As a result, the disadvantages of the conventional method are that a solid guide and a pair of torsion rollers are twisted at a steep angle, which causes scratches near the corners of the rolled material due to contact between the solid guide and the vertical direction of the torsion rollers. Due to the fluctuation, the material to be rolled is abnormally deformed and one folding flaw grows, which deteriorates the quality of the material to be rolled.

As a way to improve the shortcomings of the conventional one,
Publication No. 29902 (as shown here, a method of supporting the rolled material at four points is proposed, but solid guides)
It is believed that the occurrence of such defects will still occur;
In order to twist the same type of twist roller, it is necessary to obtain a force in the thrust direction that is greater than the force supported by the rollers from above and below, which causes abnormal deformation of the rolled material. It is quite conceivable that folding defects will occur in the next stand due to n.

(Problem of the prior art No. 2) Recently, energy saving measures have been avoided, and low-temperature rolling using low-temperature extraction in a heating furnace in the previous process has been gaining attention. When trying to perform low-temperature rolling using only a solid guide and a twisting roller behind it, as in the past, the deformation resistance of the rolled material increases and a large twisting reaction force occurs (in this case, the solid guide causes a large amount of galling). Nashi rolled material 1
There is a tendency for scratches, folding scratches, etc. to increase.

(Means and operations for solving all the problems) This invention was made by paying attention to such conventional problems, and it is possible to solve the problem by focusing on the problems of the conventional method. In a horizontal roll type continuous rolling mill, by changing the direction of the rolling force between the stands at a relatively low temperature and guiding the roll into the roll hole while twisting it little by little, it is possible to prevent scratches and fold-in scratches. This device was invented by focusing on a horizontal roll type continuous rolling machine, and is characterized by having a plurality of twisting rollers arranged in a row to guide the material to be rolled into the roll holes. This is a multi-stage billet twisting roller device for a rolling mill.

The present invention will be explained in detail below based on the drawings.

Figure 1 is a side view (a) and a front view (b) of the present invention.
(a), (b), (s) and (d) in FIG. 2 are sectional views taken along line 8-A to line D-D in FIG. 1, respectively.

In the figure, 3a, 13b, and 8c are different from conventional twisting rollers in that they have a V-shaped annular groove in which the material to be rolled is rotatably supported by a vertical support shaft via a bearing 4, and two rollers sandwiching the material to be rolled. There are more Laura X than that.

A plurality of twisting rollers consisting of X' are arranged in series.

The above-mentioned twisting roller devices F3a, 8b, 8c are connected to the slide base 15 on the sliding slide rail 13 on the base grate 14! A guide box 16ζ is fixed with a bolt. Between the valley twisting rollers, there is a guide sleeve 9 and a roller holder 10 that are fixed so that the position of the pass line coincides with the feed line of all rolled materials.
are attached to the guide box 16, and each is connected to the guide box 16 with a tapered vertical pin bolt 21.

According to the structure of the twisting roller of the present invention, the material to be rolled does not fluctuate in the vertical direction, and since a plurality of rollers are provided, the material to be rolled is gradually twisted one turn, and the material to be rolled is gently rotated. That will happen.

In addition, the solid guide provided in the flow hole pattern by arranging the diamond holes of the rolling mill does not have the structure of a guide that twists the rolled material as in the past, but has a structure of a horizontal guide (pass line). , the role is only to guide the material to be rolled, and the twisting is done mostly by the twisting roller. This means that the occurrence of scratches as in the conventional method can be prevented. It only plays the role of a guide and should not normally come into contact unless there is a fluctuation in the seam line due to some kind of trouble in the early stages of rolling.

The valley torsion roller is equipped with a torsion angle adjustment device so that the pass line can be adjusted in the entire vertical direction (here, the torsion angle adjustment device is attached so that the torsion angle can be adjusted with the vertical direction adjustment device).A circular grate 31 is installed for the above-mentioned torsion angle adjustment. A tooth groove side is provided. 12 is a speed reducer connected to the p1 hydraulic motor 11 so that it can be used for changing the rolling size, etc.

Next, the operation of rolling a material to be rolled using the apparatus configured as described above will be described.

The material to be rolled is, for example, set so that the torsional reaction force of the material to be rolled is distributed evenly through a solid guide that guides the material to be rolled (for example, 7° for 8a, 25° for 8b, 47° for Bc The roller is gradually twisted as shown in FIG.

The fact that the torsion reaction force is uniform can be achieved by dividing the above reaction force into three rollers.In other words, the torsion angle is relatively small compared to the conventional method. The torsion reaction force of the material to be rolled becomes extremely small and the deformation speed also becomes small, so each torsion roller has the same circumferential speed, making it possible to reliably engage the next roll hole shape without vibration of the material to be rolled. becomes.

The roll arrangement angle of the torsion roller is set to be larger than the torsion angle of the material to be rolled so that 92 points of support are obtained, and the material is rubbed so as to obtain a force in the thrust direction for twisting.

The vertical adjustment device (n) is used in a normal rolling mill.In order to create a large number of cross-sectional sizes of the material to be rolled, the rolling a-ru usually has a large number of hole shapes, and the Adjust the adjustment screw 25 through the slide rail 13 (by changing the course of movement and using the guide together, so that the cross-sectional size is 1. Also, it is adjusted when the one-pass line does not match, such as in the early stage of rolling, or when the heat applied to the rolled material is large.

The torsion angle adjusting device 28 is used to adjust the torsion angle when the torsional reaction force of the rolled material is large.

For vertical adjustment, make sure that the center line C that vertically supports the torsion roller and the center line C' of the cap 32 that connects the plate 29 and the torsion roller are different. By rotating the device n (koyoshi cap fully), the gaps d, d' between the twisting rollers change.

In addition, the twist angle can be adjusted by rotating the circular plate 311, which has a toothed plate, and the twist angle adjusting device 28 (
[Kyo] The twisting roller is rotating.

(Example) Experiments were carried out under the following conditions using the multi-stage steel billet twisting roller device shown in the above configuration.

(1) Type of material to be rolled: Piresoto Size: (113φ) 122φ Temperature: 1050 to 1100℃ (2) Solid guide, twist angle of twist σ-ra (β)
.

The a-ru arrangement angle (α) and the rolling material approach angle are as follows.

As a result, the generation of eaves on the rolled material is prevented and the H-
Let's compare the H type and v-H type 1 invention.

It is possible to manufacture a rolling mill with quality comparable to that of the 5V-H type rolling mill shown in the above table.

As shown in the table above, the H-H type rolling mill can cause defects due to twisting, but it is important to adjust the pushing and pulling of the material to be rolled. The problem that occurred,
The disadvantage is that the pass line tends to be unstable (9), and it cannot be rolled at very low temperatures due to twisting, but since it is a continuous method, rolling efficiency is high.

Additionally, since only horizontal rolls are required, equipment costs are low.

In the V-H type rolling mill, when the cross-sectional area of the material to be rolled becomes large, it is difficult to twist between the stands, as in the case of the H-H type rolling mill, due to the structural strength of the guide. Moreover, if the rolled material is twisted with a large cross section, tensile stress on the surface will increase, making quality defects more likely. For this reason, a V-H type rolling mill was devised that rolls the material to be rolled without twisting, and it was possible to produce blooms with large cross-sections with high efficiency and high cross-sectional accuracy.

All V-H type rolling mills are independently driven, and since there is no twisting, it is easy to control the pushing and pulling of the material to be rolled, and rolling can be performed at low temperatures. Equipment costs may be high because the rolls are installed alternately.

The multi-stage twisting roller device of the present invention (according to this, the twisting roller has a small twisting angle), the heavy load is dispersed, the pushing and pulling can be easily adjusted, and the quality is comparable to that of the V-H type rolling mill. However, it has the advantage of being able to roll at low temperatures, making it compact and inexpensive.

(Effect: With the invention of this device, the number of rolling defects and pinholes in the material to be rolled is reduced by one, and the number of rolling defects and pinholes in the material to be rolled is reduced by 1, compared to the above-mentioned 9 wide).

Quality improvements have been made. In common terms, the above-mentioned general code, V
-It is now possible to produce products with the same quality as the H-type rolling mill.

In addition, the multi-stage 1 (4-way twisting device) of the present invention reduces the torsion reaction force and deformation speed, so the cross-sectional area of the material to be rolled can be narrowed, and it can also be applied to rolled materials with large cross-sections. I think it's possible.

[Brief explanation of drawings]

Figures 1 (a) and (b) are side and front views explaining the present invention in detail, and Figures 2 (, a), (, b), (
, C) and (, d) are respective sectional views taken along line AA to line DD in FIG. Fig. 3 is an example of the twisting method of a conventional horizontal roll continuous rolling mill, Fig. 4 is an explanatory diagram of a conventional twisting roller, Fig. 5 is an explanatory diagram of an example of the occurrence of folding by the twisting roller, and Fig. 6 is Figure 7 shows an example of the distribution of flaws when a rolled material with no flaws is rolled using a conventional horizontal roll continuous rolling mill (trowel).1. ...Rolled material, 8a...Bending 1 twisting roller, 8b.
...ji 2 twisting rollers, 8C...] and 3 twisting rollers, 9... guide sleeve, 10... roller holder, 11... hydraulic motor, 12... reduction gear, 13...・Slide rail, 14...Plate, 1
5...Slide pace, 16...Guide box,
17... Rolling roll, 18... Cylindrical part, 19...
・Flange part, 20...Parken, 21...Vertical pin bolt, n...Beats:/ri, '13...Screw bushing, 24...Cylindrical part with 7 runci, δ...
Adjustment screw, 26...Twist kite, 2
7...Top r one direction 1, 11. ] Adjustment device, ah... twist angle adjustment device, two... grate, :a+... tooth groove,
31...Circular plate, :X...Vertical shaft 4;1
Gap, 33... Vertical support shaft.

Claims (1)

[Claims] A multi-stage steel billet twisting roller device for a rolling mill, characterized in that a plurality of twisting rollers for guiding a material to be rolled into a roll hole shape are arranged in series in a horizontal roll type continuous rolling mill.