JPH02194117A - Method for conveying material to be heated in walking beam-type heating furnace - Google Patents

Abstract

PURPOSE:To improve the precision in the width and thickness of a product in rolling by obliquely advancing a movable-beam truck at a fixed deviation angle to the traveling direction of the truck in the horizontal plane. CONSTITUTION:The material 4 to be heated on a fixed beam 21 of the walking beam-type heating furnace is moved by a movable beam 11, and heated. In this case, the movable-beam truck 1 is obliquely moved at a fixed deviation angle to the traveling direction of the truck 1 in the horizontal plane by a slide plate 12 and a fixed guide 13. Consequently, the material 4 is rectilinearly advanced, and moved in the cross direction of the furnace. By this method, skid marks are drastically reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a method for efficiently and uniformly heating a material to be heated such as a slab in a walking beam heating furnace.
The present invention relates to a method of conveying a heated material in which the movable beam truck is given oblique movement to simultaneously give the heated material straightness and lateral movement to reduce skid marks.

Conventional technology Walking beam furnaces, as is well known, are composed of a fixed beam and a movable (moving) beam, and the material to be heated, such as a slab, is moved alternately between the fixed beam and the movable beam by vertical and back-and-forth movements of the movable beam. It is structured to be transported.

As mentioned above, in conventional walking beam furnaces, the material to be heated is moved forward by the vertical and back-and-forth movement of the movable beam, so the parts that come in contact with the beam are underheated compared to other parts, causing so-called skid marks. This causes deterioration of the width, thickness, etc. of the product during rolling.

Measures to prevent skid marks include, for example, increasing the height of the skid to increase thermal resistance and suppressing the heat flow from the heated material to the water-cooled beam, or increasing the lift distance of the movable beam to increase the height of the skid pipe. Method for reducing thermal radiation inhibition caused by shadows (Japanese Patent Application Laid-Open No. 58-22411
(see Publication No. 0) has been proposed.

In the former case, it is true that if the height of the skid is made sufficiently high, the temperature difference between the skid beam and the skid contact area can be reduced, which may have a miraculous effect on eliminating skid marks. In the case of walking beams, the skid height is limited to around 150 shoes, so it is not possible to obtain a sufficient skid mark reduction effect.

The latter is a method of obtaining a greater skid mark reduction effect by changing the lift amount of the skid door itself to about 200 to 300 INR instead of the skid height.
By increasing the amount of lift in this way, we aim to reduce the inhibition of heat radiation due to the shadow of the skid pipe, but since the contact surface with the skid is limited to a certain part of the lower surface of the heated material, the overall area of the heated material is The uniform heating effect cannot be said to be sufficient.

Problems to be Solved by the Invention In view of the actual situation described above, this invention provides a method for changing the skid height or increasing the lift amount of the skid beam without changing the contact area between the heated material and the skid. Instead, we propose a method for conveying heated materials that can more effectively and sufficiently reduce skid marks by using a means that does not limit the contact surface between the heated material and the skid to a fixed area on the lower surface of the heated material. This is what I am trying to do.

Means for solving the problem Skid marks in walking beam furnaces are caused by contact between the heated material and the skid, so in order to reduce skid marks, it is necessary to minimize the contact area between the heated material and the skid. From the viewpoint that it is effective to change the heating direction, the present invention is designed to obtain a uniform heating effect by moving the material to be heated in a direction perpendicular to the conveying direction while moving the material to be heated in a straight line.

That is, the present invention provides a forward motion (oblique movement) of the movable beam carriage by giving a certain deviation angle in the horizontal plane to the moving direction of the movable beam carriage, thereby moving the material to be heated in a straight line while moving it in the width direction of the furnace. The purpose is to move the

As a means of imparting obliqueness to the movable beam carriage, it is possible to provide the movable beam carriage so that it moves obliquely by tilting it at a certain angle with respect to the direction of the furnace center line in a horizontal plane, or to ensure the straightness of the movable beam carriage. A method is adopted in which the cart is moved diagonally in a horizontal plane by attaching a tapered slide plate to the cart while aligning the center line of the cart with the center line of the furnace using a fixed guide and a slide plate. be able to.

By placing the material to be heated on the fixed beam biased to one side in the furnace width direction, the movable beam with oblique movement moves straight forward and backward, and is moved in the furnace width direction on the opposite side from when it was charged. Move to.

By moving the material to be heated in the width direction of the oven while moving straight, the contact area with the movable beam constantly changes, preventing a drop in temperature of the contact area of the material to be heated, and uniformly heating the material.

Example Figure 1 illustrates a method of imparting obliqueness to a moving beam carriage. Figure (B) shows a method in which the movable beam carriage is moved in the direction of angle θ1 through the slide plate (2) and fixed guide (3). Keeping the direction the same, angle θ1
A slide plate (12) having a taper of
1) shows a method of moving the object in the direction of angle θ1.

That is, in FIG. 1 (A>), by tilting the movable beam carriage (1) by an angle θ1, the material to be heated (4) placed on the movable beam carriage (4) is moved in the furnace width direction while moving straight. Figure (B) shows a tapered slide plate (
12) and a fixed guide (13).
1) is moved in a diagonal direction, thereby moving the material to be heated on the cart in the width direction of the furnace while moving straight.

Note that θl is not particularly limited, and may be adjusted as appropriate depending on the size of the heating furnace.

Figure 2 shows an example of a walking beam heating furnace to which the method shown in Figure 1 (B) is applied, where (0) is the furnace body, (11) is the movable beam, and (ii-i) is the movable beam. The skid, (21) shows the fixed beam, (21-1) shows the fixed beam skid, and (14) shows the drive mechanism of the movable beam, respectively.

In other words, when transporting the material to be heated in the heating furnace, the material to be heated (4) is loaded biased to one side in the furnace width direction and placed on the fixed beam (21). Mechanism (1
When the movable beam cart (1) is moved up and down and back and forth by step 4), the movable beam cart is moved in the angle θ1 direction by the tapered slide plate (12) and the fixed guide (13), so that it moves on the fixed beam (21). The material to be heated (4) placed on the furnace moves straight and moves in the width direction of the furnace.

Therefore, the contact portion of the heated material with the movable beam skid (11-1) and the fixed beam skid (21-1) is as follows:
It changes every cycle of the vertical and longitudinal movement of the movable beam truck (1). Therefore, the temperature of the contact portion of the heated material with the fixed beam skid and the movable beam skid hardly changes, and the whole is uniformly heated, so skid marks are hardly generated.

As described in detail, the method of the invention provides the following effects.

■ By imparting obliqueness to the movable beam cart, it is possible to uniformly heat the material to be heated, thereby eliminating skid marks caused by contact with the movable and fixed skids, compared to the conventional conveying method where the contact area is approximately constant. It is possible to significantly reduce the amount compared to the previous one, and it is possible to improve the sheet width, sheet thickness accuracy, etc. during rolling more than ever before.

(2) The means for carrying out the method of this invention does not require any special modifications or mechanisms, and the existing drive device can be used as is, so it can be easily applied to existing furnaces.

[Brief explanation of the drawing]

Figure 1 shows an example of a method for imparting obliqueness to a movable beam carriage. Figures and Figure (B) are plan views showing a method of imparting obliqueness using a slide plate with a taper f = j. Figure 2 is a walking beam type to which the method shown in Figure 1 (B) is applied. It is a schematic vertical front view illustrating a heating furnace. 1... Movable beam trolley 2.12... Slide plate 3.13... Fixed guide 4... Heated material 11... Movable beam 21.・Fixed beam

Claims (1)

[Claims] In a walking beam heating furnace, when the material to be heated on a fixed beam is heated while being transferred by a movable beam, the movable beam carriage is moved forward with a certain angle of deviation in the horizontal plane in the direction of movement of the movable beam carriage. A method for conveying a material to be heated in a walking beam heating furnace, characterized in that the material to be heated is moved in the width direction of the furnace while moving in a straight line by imparting oblique movement.