JPH0647405A - Rolling device - Google Patents

Abstract

PURPOSE:To execute high draft rolling while heating a rolled stock at the optimum temp. and to enable operation at high energy efficiency and low cost by connecting a feed roll and a large diameter roll or a fixed disk of a rolling mill to a power supply and using them as energizing electrodes. CONSTITUTION:The rolled stock 6 is rolled with a single spindle planetary mill 1 while it is fed in the direction of the arrow with feed rolls 7. The feed roll 7 and the large diameter roll 5 are connected to the power supply 8 and used as the electrodes. The rolled stock 6 is directly energized through the large diameter roll 5 and its temp. is raised by generating Joule heat between the feed roll 7 and the large diameter roll 5. In such a case, work rolls 3, back-up roll 2 and back-up block 4 are insulated from a stand. In this way, high draft rolling is efficiently executed while controlling the temp. with high accuracy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling apparatus for performing strong reduction rolling while directly heating a rolled material by heating it.

[0002]

2. Description of the Related Art A planetary rolling machine can be mentioned as a highly efficient rolling machine capable of carrying out a strong reduction in one pass of a rolled material.
The planetary rolling mill is capable of performing strong reduction rolling with a reduction rate of 90% or more, and can perform rolling equivalent to 5 to 6 stands of continuous hot rolling mill train with one stand. As the planetary rolling machine, there is a single-axis planetary rolling machine (hereinafter referred to as SPM), which is characterized by its relatively simple structure and robustness, and a large diameter roll system and a fixed plate system are known.

FIGS. 5 and 6 show the structures of a conventional typical large-diameter roll system and fixed plate system. A large-diameter roll type rolling mill is shown in FIG. 5, and the SPM 1 is a rolling mill provided with only one set of an assembly in which a plurality of work rolls 3 are arranged in a planetary pattern on the outer periphery of one backup roll 2. A part of the outer circumference of the work roll 3 is supported by a backup block 4, and a rolling material 6 is passed between the large-diameter roll 5 and the work roll 3 for rolling.

FIG. 6 shows a fixed plate type rolling mill using a fixed platen 10 instead of a large diameter roll.

Although the rolling amount of one work roll is small and the rolling pressure and torque are light, rolling is successively performed by the succeeding work rolls, so that a total reduction of 90% or more is possible.

Usually, when performing hot rolling by SPM, the rolled material is heated in advance in a heating furnace and fed into SPM by a feed roll for rolling. However, in general, the speed at which the feed roll feeds the rolled material is relatively slow, and the rolled material radiates heat to be cooled in the course of conveyance, so that the temperature from the leading end to the trailing end becomes uneven. Further, the rolled material comes into contact with a feed roll, a work roll, a large-diameter roll, or a fixed platen to remove heat, and the temperature of the rolled material decreases. Normally, heating is performed in anticipation of this temperature decrease, but excessive temperature rise causes an increase in scale loss of the rolled material and an increase in energy cost. In addition, even if heating is performed by predicting the temperature decrease until rolling, it is realistic to use advanced technology to control the temperature range from the leading edge to the trailing edge of the rolled material during actual rolling. It costs.

As a device for preventing the temperature drop of a pre-heated rolled material, there is a hot rolling mill disclosed in JP-A-62-84808. This rolling mill is a planetary rolling mill in which heaters are arranged around feed rolls, work rolls, and backup rolls. However, heating the rolls adds significant equipment complexity. Also, the tip of the rolled material,
There was a problem that there was a risk of damaging the equipment due to rising and falling of the nose at the rear end.

Considering the above circumstances, it is most rational to directly heat the rolled material in the rolling line and adjust the temperature. Induction heating is considered as such a heating method. However, since induction heating uses a high frequency, the equipment is complicated and expensive, and not only a large space is required for installation, but also the heating effect is low.

[0009]

SUMMARY OF THE INVENTION According to the present invention, the rolled material is directly heated in the rolling line to facilitate the adjustment of the rolling temperature, the strong reduction is possible, the cost is low, and the large equipment space is required. In addition, an object is to obtain an apparatus that can perform rolling and heat treatment on the same line as required.

[0010]

The rolling apparatus of the present invention is provided with a feed roll and a single-axis planetary rolling mill from the upstream side in the traveling direction of the rolled material, and the feed roll and the large-diameter roll of the rolling mill or The above-mentioned problem is solved by a means characterized in that a fixed plate is connected to a power source to form an energizing electrode.

The rolling apparatus of the present invention is further provided with a feed roll and a single-axis planetary rolling mill from the upstream side in the traveling direction of the rolled material, and further with pinch rolls, the pinch roll and the rolling mill. The above problem can also be solved by a means characterized in that the large-diameter roll or fixed plate is connected to a power source to form a current-carrying electrode.

The rolling apparatus of the present invention is further provided with a feed roll and a single-axis planetary rolling mill from the upstream side in the traveling direction of the rolled material, and further with at least two pairs of pinch rolls, and each pair of pinches. The above-mentioned problems can also be solved by a means characterized in that a power source is connected between the rolls to form an energizing electrode.

The rolling apparatus of the present invention is further provided with a feed roll and a single-axis planetary rolling mill from the upstream side in the traveling direction of the rolled material, and further, a pinch roll is used as a power source for the feed roll and the pinch roll. The above-mentioned problem can also be solved by a means characterized in that it is connected to form an energizing electrode.

[0014]

In the apparatus of the present invention, the heating method in which the roll that comes into contact with the rolled material is used as an electrode to energize the rolled material is adopted, and the Joule heat generated between the rolls that become the electrodes causes
The rolled material is heated. The temperature can be accurately controlled by adjusting the supplied current. Therefore, it is possible to quickly raise the temperature of the rolled material to the optimum temperature, and perform the strong reduction rolling and the heat treatment.

The apparatus of the present invention is much lower in facility cost than the installation of a heating furnace or an induction heating apparatus off-line, and is advantageous in terms of pace saving. When using a large-diameter roll or fixed plate as one of the electrodes, the temperature reaches the maximum value when the rolled material reaches the large-diameter roll, so consider cooling during the transfer process as in the case of the heating furnace method. Therefore, it is possible to perform rolling with lower energy than the method in which the periphery of all rolls is heated by a heater without requiring extra heating.
When the pinch roll is used, it may be non-driving and the pressing pressure may be small, so that the structure may be compact. For devices that already have a pinch roll,
It is also possible to use this as an electrode. The power supply to the roll can be performed using a brush made of copper or the like. INDUSTRIAL APPLICABILITY The present invention can be applied to the rolling of all types of plates that easily generate resistance heat when carbon steel, low alloy steel, stainless steel, etc. are energized. The temperature for energizing and heating may be not only the hot rolling temperature but also a relatively low temperature such as warm rolling.

[0016]

EXAMPLE An example of the rolling apparatus of the present invention will be described with reference to FIGS. The present invention uses the feed roll 7, the large-diameter roll 5, or the pinch roll 2 as an electrode to directly energize the rolled material 6 to accurately control the temperature and perform high-pressure reduction rolling,
It is characterized by performing heat treatment before and after rolling, or both.

FIG. 1 shows a rolling apparatus comprising a single roll planetary rolling machine (SPM) 1 having a feed roll 7 serving as an electrode and a large diameter roll 5 serving as an electrode or a fixed plate (not shown) behind the feed roll 7. In FIG. 1, the rolled material 6 is rolled by the SPM 1 while being fed by the feed roll 7 in the direction of the arrow.

In the apparatus shown in FIG. 1, the feed roll 7 and the large-diameter roll 5 are connected to a power source 8 to serve as electrodes. The rolled material 6 is directly energized through the large-diameter roll 5, and Joule heat is generated between the feed roll 7 and the large-diameter roll 5 to raise the temperature. In this case, the work roll 3, the backup roll 2, and the backup block 4 need to be insulated from the stand. The power supply 8 may be alternating current or direct current.

The large-diameter roll 5 of the SPM 1 may be replaced with a stationary platen (not shown) to energize. The same applies to the following examples.

FIG. 2 shows a rolling apparatus comprising a feed roll 7, an SPM 1 having a large diameter roll 5 serving as an electrode behind the feed roll 7, and a pinch roll 9 serving as an electrode.

The rolling apparatus shown in FIG. 2 has a feed roll 7 and an S.
The pinch roll 9 is installed between the PM1 and the PM1.
The electrode paired with the pinch roll 9 is the large diameter roll 5. The pinch roll 9 may be in front of the feed roll 7 (upstream side). Furthermore, it is also possible to place the pinch roll 9 after the SPM 1 (downstream side) in order to perform the heat treatment. Here, the heat treatment means improvement of metallurgical characteristics and heat retention of the rolled material. In this case, the same insulation as in the case of FIG. 1 is required, and further, when the large diameter roll 5 is grounded, the feed roll 4 needs to be insulated.

FIGS. 3A, 3B and 3C show an SPM 1 having a feed roll 7 and a large diameter roll 5 behind it.
Further, a rolling apparatus comprising at least two pairs of pinch rolls 9 serving as electrodes is shown.

The apparatus shown in FIG. 3A has a feed roll 7
Two pairs of pinch rolls 91 and 92 are placed on the entry side of. The rolled material 6 is electrically heated between the pinch rolls 91 and 92. When the pinch roll 91 is grounded, it is necessary to insulate the feed roll 4. Further, since the rolled material 6 is removed from heat by the feed roll 7, the pinch rolls 93 and 94 which serve as electrodes may be placed between the feed roll 7 and the SPM 1. At this time, feed roll 7 and SPM
1 needs to be insulated.

Further, by placing pinch rolls 95 and 96, which serve as electrodes, on the exit side of the SPM 1, it is possible to heat the material after rolling by energizing heating. When grounding the pinch roll 96, it is necessary to insulate the SPM 1.

The apparatus shown in FIG. 3 (B) has a pinch roll 9
2, 93 are placed so that the feed roll 7 is sandwiched therebetween. Alternatively, the pinch rolls 94 and 95 may be placed so as to sandwich the SPM 1. Also in this case, it is necessary to insulate the feed roll 7 and the SPM 1 from each other.

The apparatus shown in FIG. 3C has a feed roll 7
The pinch roll 92 that serves as an electrode is placed on the inlet side of the and the pinch roll 95 that serves as an electrode on the outlet side of the SPM 1. It is necessary to insulate the feed roll 7 and the SPM 1.

FIG. 4 shows a rolling apparatus including a feed roll 7 as an electrode, a SPM 1 behind the feed roll 7 and a pinch roll 9 as an electrode.

The apparatus shown in FIG. 4 has a feed roll 7 and an SPM.
The pinch roll 9 serving as an electrode is placed between the pinch roll 1 and the electrode 1. The electrode paired with the pinch roll 9 is the feed roll 7. Further, the pinch roll 9 may be on the entrance side of the feed roll 7. Furthermore, pinch roll 9
Can also be placed on the exit side of SPM1.

Next, a concrete example of the apparatus of the present invention will be described.

In the above embodiments, when electricity is supplied using pinch rolls and feed rolls, it is possible to shorten the distance between the rolls sandwiching the rolled material and use only one power source.

A stainless steel (JIS SUS 304) plate was rolled using the rolling apparatus shown in FIG. The main specifications and rolling conditions of the equipment are as follows.

Work roll diameter 25 mm Number of work rolls 16 Large diameter roll diameter 180 mm Large diameter roll rotation speed 600 rpm Feed roll diameter 80 mm Distance between axial centers of feed roll and large diameter roll 7
00mm Rolled material SUS304 Plate thickness before rolling 12.0mm Plate thickness after rolling 1.2mm Plate width 50mm Preheating temperature 800 ° C Rolling speed 1.5m / min Power supply AC 15V 1
5 KA heating target temperature (target rolling temperature) 9
When rolling was performed under the condition of 00 ° C or higher, the temperature of the rolled material measured immediately before the large diameter roll was 900 ° C from the leading end to the trailing end.
The error was ± 6 ° C with respect to the target temperature, and the rolling operation was extremely successful. Further, there was no occurrence of sparks, and strong reduction rolling at a rolling rate of 90% was possible.

[0033]

According to the present invention, in a rolling line,
Strong rolling can be performed while heating the rolled material to an optimum temperature, and it is possible to operate at low cost with high energy efficiency.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of an embodiment of a rolling apparatus of the present invention.

FIG. 2 is a diagram showing a schematic configuration of another embodiment of the rolling apparatus of the present invention.

FIG. 3 is a diagram showing a schematic configuration of still another embodiment of the rolling apparatus of the present invention.

FIG. 4 is a diagram showing a schematic configuration of still another embodiment of the rolling apparatus of the present invention.

FIG. 5 is a side view showing a schematic configuration of a conventional large-diameter roll type single-shaft planetary rolling machine.

FIG. 6 is a side view showing a schematic configuration of a conventional fixed plate type single-axis planetary rolling machine.

[Explanation of symbols]

 1: Single-axis planetary rolling machine 2: Backup roll 3: Work roll 4: Backup block 5: Large diameter roll 6: Rolling material 7: Feed roll 8: Power supply 9: Pinch roll 10: Fixed platen

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] February 17, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 4]

[Figure 5]

[Figure 3]

[Figure 6]

Claims (7)

[Claims] 1. A feed electrode and a single-axis planetary rolling mill are arranged from the upstream side in the traveling direction of the rolled material, and the feed roll and a large-diameter roll of the rolling mill or a fixed platen are connected to a power source to supply a current-carrying electrode. A rolling mill characterized by the above. 2. A feed roll and a single-axis planetary rolling mill are arranged from the upstream side in the traveling direction of the rolled material, further pinch rolls are arranged, and the pinch roll and a large diameter roll of the rolling mill or fixed. A rolling mill characterized in that the plate and the plate are connected to a power source to form a current-carrying electrode. 3. A feed roll and a single-axis planetary rolling machine are arranged from the upstream side in the traveling direction of the rolled material, at least two pairs of pinch rolls are arranged, and a power source is connected between each pair of pinch rolls. Rolling equipment characterized by being used as a current-carrying electrode. 4. Two pairs of pinch rolls are provided on at least one of the feed side and the feed side of the feed roll and the feed side of the rolling mill.
The rolling mill according to claim 3, wherein the rolling mill is arranged at a position and a power source is connected between each pair of pinch rolls. 5. A pair of pinch rolls is provided on each of the feed-roll side of the feed roll and / or the feed-roll side of the rolling mill, and a power source is connected between the pinch rolls on each feed side. Rolling apparatus according to item 3. 6. A pair of pinch rolls are respectively provided on the inlet side of the feed roll and the outlet side of the rolling mill, and a power source is connected between the pinch rolls. Rolling equipment. 7. A feed roll and a single-axis planetary rolling machine are arranged from the upstream side in the traveling direction of the rolled material, and the pinch roll is connected to a power source to form a current-carrying electrode. A rolling mill characterized by the above.