JP2003053415A - Uniformly heating device in rolling of magnesium and magnesium alloy thin sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling device which can cope with variation in working speed by raising thermal conductivity between a heating device and a material to be rolled and also reducing heat drop between the heat zone of the heating device and rolling-work rolls and, simultaneously in this way, in which uniformly heating devices of absolute minimum are provided while reducing the variation of heating temperature range and preventing the device and the material to be rolled from temperature rising. SOLUTION: In the heating device for materials to be rolled in the rolling of the thin sheet made of magnesium and its alloy, this device is the uniformly heating device in thin-sheet rolling, the uniformly heating devices are arranged above and below the material to be rolled by proximating its one end to the rolling work rolls for rolling it by clamping the material to be rolled from above and under and a preheating device using periphery contacting type heat rollers is provided on the other side of the uniformly heating device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for a rolling apparatus in which a metal plate material is passed between rolls to be plastically deformed to obtain a desired plate thickness, and particularly magnesium and its alloys are evenly rolled during rolling. The present invention relates to a heating device.

[0002]

2. Description of the Related Art Conventionally, a general metal rolling apparatus is composed of upper and lower rolling work rolls having a relatively small diameter arranged on a rolling roll stand, and upper and lower pack-up rolls and rolling work rolls arranged so as to sandwich them from the outside. In addition, the material to be rolled, which is supplied from the winding devices arranged on the left and right of the rolling roll stand, is passed between the upper and lower rolling work rolls to obtain a strip material having a desired plate thickness.

Generally, it is desirable to perform the plastic working of a metal in a constant temperature range. In particular, in the plastic working of magnesium and magnesium alloys, it is not possible to carry out the working at a normal temperature (20 ° C.) and a low temperature of 150 ° C. or lower. It is difficult to reduce the elongation due to work hardening, and the temperature is suitable for magnesium and its alloys.
Rolling is performed in a warm (hot) state at 350 ° C. In order to stabilize the quality, processing was performed within a certain temperature range.

[0004]

However, the heating device during rolling work has a low heat transfer efficiency in a normal radiant heating furnace and therefore has a low responsiveness in temperature control. It becomes difficult to maintain the uniformity of the temperature of the sheet. Especially, in the sheet rolling of 1 mm or less, if the distance between the heat zone of the heating device and the center point of the rolling work roll becomes large, the influence of the heat decrease during that period is large,
There was a drawback that it became difficult to respond to changes in processing speed.

The contact method in which the heating device directly contacts the material to be rolled has a good heat transfer efficiency, but in the case of high-speed processing, scratches may occur on the surface of the material to be rolled.

Further, since magnesium and its alloys are active metals, their ignition points are as low as 500 ° C. Therefore, when heated above 500 ° C., fine powder separated from the surface of the material to be rolled during plastic working etc. The particles can react with the heat source to generate explosive combustion. Therefore,
Measure the temperature of the material to be rolled and adjust the temperature to 150-350
In the method of controlling the temperature of the heating furnace so that it reaches the target value of ℃, the feeding speed of the material to be rolled becomes fast and a high-temperature heating furnace is required, which is the required heating temperature and ignition point temperature. With magnesium and its alloys in close proximity to one another, this is a very dangerous situation.

Further, a thin and narrow plate material, for example, 0.
In a rolling mill for plate materials having a thickness of 1 to 0.5 mm and a width of 250 mm, it has been required to develop an efficient heating device in a limited space in order to reduce manufacturing cost.

The present invention has been made in view of the above problems, and its object is to increase the heat transfer coefficient between the heating device and the material to be rolled and to improve the heat between the heat zone of the heating device and the rolling work roll. By reducing the decrease, it is possible to respond to changes in the processing speed, and at the same time, the variation in the heating temperature range is reduced to prevent the equipment and the material to be rolled from rising in temperature.
An object of the present invention is to provide a rolling apparatus in which a soaking and heating apparatus having a minimum required temperature can be arranged.

[0009]

In order to solve the above-mentioned problems, the invention according to claim 1 is to provide a rolled material heating apparatus for rolling magnesium and alloy thin sheets thereof by sandwiching the rolled material from above and below. One end is close to the rolling work roll to be rolled, and a soaking and heating device is arranged above and below the material to be rolled, and at the other end of the soaking and heating device, heat between the preheating device and the material to be rolled by the outer peripheral contact type heat roller As the conductivity increases, the heat drop between the heat zone of the soaking and heating device and the rolling work rolls decreases, and it becomes possible to cope with changes in the rolling speed. At the same time, it is possible to reduce the variation of the heating temperature range to prevent the apparatus and the material to be rolled from rising in temperature, to arrange a soaking and heating apparatus having a necessary minimum temperature, and to reduce the installation space of the rolling apparatus.

Further, the invention according to claim 2 is characterized in that the soaking heat plate of the soaking and heating device has a chamfered shape on the side of the rolling work roll, and the tip thereof is made to penetrate into the projected area of the rolling work roll. Since the soaking and heating device can be placed close to the work rolls, the heat drop between the heat zone of the soaking and heating work roll and the rolling work rolls can be extremely reduced, and it is possible to prevent changes in the rolling speed. Can cope well.

According to a third aspect of the present invention, there is provided a soaking and heating apparatus in which a rotating heat roller having a heater is embedded in the soaking heat plate on the material to be rolled side, and the rotating heat roller is embedded. The outer surface of the rotary heat roller is pressed against the material to be rolled, the heat transfer to the material to be rolled is a direct transfer from the rotary heat roller,
It is supplied from both the radiation transfer from the soaking heat plate and the soaking transfer efficiency is further improved.

According to a fourth aspect of the present invention, the soaking and heating device is brought into contact with the outer periphery of the soaking and heating plate by a driving roller which is placed close to the rolling work roll, and the rolled material is sandwiched and rotated. It is characterized in that it is formed by the contact zone, according to this configuration, since there is no relative slip between the temperature-equalizing heating device and the material to be rolled, without causing scratches on the material to be rolled, Rolling can be performed at high speed.

[0013]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing the whole of a reversible rolling mill (1). This rolling mill (1) performs rolling work of a thin metal plate supported by a backup roll (9). 3) is arranged on a rolling roll stand (2), and a winding device (4) for supplying and winding the material to be rolled (8) is provided on the left and right sides of the rolling roll stand (2). Between the (2) and the winding device (4), a soaking and heating device (5) and a pressure and positioning pneumatic cylinder (6) are installed on the upper part of the soaking and heating device (5). ) Is provided with a contact type heat roller (7) which is a preheating device on the rolled material entry side.

In the rolling roll section, a pair of upper and lower rolling work rolls (3) and (3) having a relatively small diameter are laid in parallel with each other on a portal-shaped rolling roll stand (2) so as to be in rolling contact with each other. The material to be rolled (8) is passed between the rolling work rolls (3) and (3) for rolling. A pair of large-diameter pack-up rolls (9), which roll-contact with the rolling work rolls (3) in parallel with the rolling work rolls (3) so as to sandwich the rolling work rolls (3), to form a pack-up support during rolling.
(9) is provided.

A soaking and heating device (5) is installed on both sides of the rolling work roll (3). Uniform temperature heating device (5)
As shown in FIGS. 2 and 3 in detail, the soaking heat plate (10), the heater (11), and the temperature sensor (12) provided so as to sandwich the rolled material (8) from above and below. It consists of and.

The soaking heat plate (10) is provided in the vicinity of the rolling work roll (3) and has a heating area covering the width of the material to be rolled (8) and a predetermined length. The end on the roll (3) side has an inclined chamfer (1
In addition to the shape of 3), the tip of the rolling work roll 3 is installed so as to reach a position within the projected area of the rolling work roll 3.

The heater (11) is embedded in the soaking heat plate (10), and its outer periphery is installed so as to be in close contact with the soaking heat plate (10).

A temperature sensor (12) is provided on the rolling work roll (3) side of the soaking heat plate (10).
The temperature sensor (12) detects the temperature of the material to be rolled (8) and controls the energization of the heater (11). By this energization, the amount of heat applied to the material to be rolled (8) supplied to the rolling work rolls (3) is constantly kept at a constant temperature (set value ± 5%) by radiation from the soaking heat plate (10). Is being supplied.

An air pressure cylinder (6) is provided above the soaking heat plate (10), and by this air pressure cylinder (6), the upper and lower intervals of the soaking heat plate (10) are rolled at a constant pressure. Or press the material (8) in between.
Alternatively, the rolled material (8) is positioned and held so as to have an interval within 10 times the plate thickness of the rolled material (8).

Reference numeral (7) is a preheating roller, which is provided between the winding device (4) and the inlet side of the soaking and heating device (5), and the surface of the material to be rolled (8) adheres to the surface thereof. The passing cylindrical rollers (14) are arranged one above the other. Inside the cylindrical roller (14), a heating body (15) made of a liquid containing heated gas or hot water at a constant temperature is constantly supplied, and the surface of the roller (14) is always kept at a constant temperature to obtain a material to be rolled (8). ) Is controlled to preheat.

As another embodiment, FIG. 4 shows the structure of a soaking and heating device (5 ') of a rotary heat roll system. The difference of the present configuration from the soaking heat plate (10) is that the heating heater (11) is a rotating heat roller (16), and the rotating heat roller (16).
Has a heater inside the roller, and electric power is supplied from the outside by a slip ring and an attachment.

The outer surface of the rotary heat roller (16) is positively brought into pressure contact with the material to be rolled (8) by the pneumatic cylinder (6), and the bearing is used to support the pressure contact force so as to be rotatable.

The heat transfer to the material to be rolled (8) is carried out both from the surface of the rotary heat roller (16) directly and from the radiant heat of the soaking heat plate (10 ').

The actual condition of another soaking and heating device (5 ") will be described with reference to Fig. 5. This soaking and heating device (5").
Is characterized in that a caterpillar type contact zone (17) is provided on the outer periphery of the soaking heat plate (10 ″).

Specifically, a first drive roller (18) is provided above and below a position close to the rolling work roll (3) of the metal rolling mill, and a second drive is similarly provided at a separated position. A soaking heat plate (10 ″) is arranged between the roller (19) and the pair of drive rollers (18) and (19) are annularly contacted with the upper and lower surfaces of the soaking heat plate (10 ″). Contact zones (17) are arranged above and below the material to be rolled (8).

The annular contact zone (17) has first and second contact zones.
It is installed by being tensioned by the drive rollers (18) and (19) of the above, and the material to be rolled (8) is moved up and down with the driving of the upper and lower drive rollers (18) and (19) or the movement of the material to be rolled (8). And is rotated in the same direction as the material to be rolled at the same speed.

Inside the soaking heat plate (10 ″), the same heater (11 ′) as in the above-mentioned embodiment is used.
The heat quantity from the heater (11 ') is transferred from the soaking heat plate (10 ") to the contact zone (17), and the material to be rolled (8) is directly fed from the upper and lower contact zones (17). It is heated by conduction.

With this construction, if the heating zone in the contact zone (17) is provided long, there is no relative slip between the material to be rolled (8) and the contact zone (17), so that no scratches occur. Rolling can be performed at high speed.

If the first driving roller (18) is of a driving type, it is possible to handle not only continuous heating of a long material but also an extremely short material to be rolled.

Further, if the contact zone (17) is made of molybdenum having a high thermal conductivity, the thermal efficiency can be further improved.

Next, still another embodiment of the present invention will be described. The rolling roll stand (2) shown in FIG. 6 is of a type that does not have a backup roll which is a supporting roll, and the preheating roller (7 ′) has an electric heater (20) and a temperature sensor inside the cylinder. It is arranged to keep the roller surface temperature constant.

These uniform temperature heating devices (5) (5 ')
The (5 ″) and the preheating heater rollers (7) and (7 ′) are properly used depending on the characteristics of the material to be rolled. For example, in the case of low temperature and low speed, the soaking heater (5) and the preheating heater roller ( 7) In the case of high temperature and high speed, it is used in combination like a uniform heating device (5 ') and a preheating heater roller (7').

With the above-mentioned structure, the material to be rolled (8) is sent from one of the winding rolls (4) by the driving device to the soaking and heating device (5) via the preheating roller (7) and heated to a predetermined temperature. And is rolled by passing between the upper and lower rolling work rolls (3) and wound up on the other winding roll (4), and then fed from the other in the reverse direction to a predetermined plate thickness. It is rolled. This is a rolling device which is generally called reversible type, but it can be applied to a non-reversible type rolling device having only one direction.

[0035]

As described above, according to the present invention,
It is possible to improve the thermal conductivity between the heating device and the material to be rolled, reduce the heat drop between the heat zone of the heating device and the rolling work roll during rolling, and respond to changes in the processing speed. . By this, at the same time, it is possible to reduce the variation of the heating temperature range and prevent the temperature of the apparatus and the material to be rolled from rising, and it is possible to provide the soaking and heating apparatus of the minimum necessary temperature and the installation space of the rolling apparatus. The manufacturing cost can be reduced by reducing

[Brief description of drawings]

FIG. 1 is a perspective view of a sheet metal rolling apparatus showing an embodiment of the present invention.

FIG. 2 is a side view showing an embodiment of a rolling work roll and a soaking and heating device according to the present invention.

FIG. 3 is a side view showing an embodiment of a soaking and heating device according to the present invention.

[Figure 4]

FIG. 3 is a side view showing another embodiment of the soaking and heating device in FIG.

[Figure 5]

FIG. 3 is a side view showing still another embodiment of the soaking and heating device in FIG.

FIG. 6 is a side view showing a rolling work roll and another embodiment of a soaking and heating device according to the present invention.

[Explanation of symbols]

1 rolling mill 2 Roll stand 3 rolling work rolls 4 Winding device 5 Uniform heating device 6 Pneumatic cylinder for positioning 7 Contact heat roller (preheat roller) 8 Rolled material 9 Backup roll 10 Soaking heat plate 11 heating heater 12 Temperature sensor 13 Inclined chamfer 14 roller 15 heating element 16 rotating heat roller 17 Caterpillar contact zone 18 Drive roller 19 Drive roller 20 electric heater

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masahiko Shibata             21 Higashikaigan-cho, Amagasaki City, Hyogo Prefecture 3 Osaka Fuji             Industry Co., Ltd. (72) Inventor Ken Isozaki             1929-3 Hayano, Mobara-shi, Chiba Cosmo Mobara             No. 413 (72) Inventor Kenji Yoneoka             2-5-5 Nishiishikiri-cho, Higashi-Osaka City, Osaka Prefecture             305

Claims (4)

[Claims] 1. A rolled material heating apparatus for rolling magnesium and its alloy thin plates, wherein a rolled material is sandwiched from above and below to be a rolling work roll, and one end is adjacent to this rolling work roll, and above and below the rolled work roll. A soaking and heating device for thin sheet rolling, which is provided with a soaking and heating device disposed in and a preheating device by an outer peripheral contact type heat roller on the other end side of the soaking and heating device. 2. The thin plate according to claim 1, wherein the soaking heat plate of the soaking and heating apparatus has a chamfered shape on the side of the rolling work roll, and the tip of the chamfer is inserted into the projected area of the rolling work roll. Soaking and heating device for rolling. 3. A soaking and heating device is formed by embedding a rotating heat roller having a heater inside a soaking material of a soaking heat plate, and an outer surface of the rotating heat roller is pressed against the material to be rolled. Claim 1 or 2 characterized by the above.
A uniform temperature heating device in the thin plate rolling described. 4. A soaking and heating device is formed by a caterpillar type contact zone which contacts the outer periphery of a soaking heat plate by a driving roller which is placed close to a rolling work roll and which rotates by sandwiching and rolling a material to be rolled. Claim 1 characterized by the above.
Alternatively, the uniform temperature heating device in the thin plate rolling described in 2.