JPS6011593B2 - Melting method for metal materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a melt-cutting method that improves the progress of material when melt-cutting a cross section present in a slab after blooming and rolling.

As a means to remove surface defects from high-temperature metal materials such as slabs, a hot scarfure is usually applied to the metal surface.
The entire surface, including the irregularities, is machined by melting.

This scarfing method uses separate equipment for each of the four sides (top and bottom, left and right sides) of the slab, and performs independent melt cutting on each side, but conventional melt cutting methods maintain the thickness of the entire slab at a uniform thickness. From this point of view, as shown in Figure 1, the entire surface of the slab is melt-cut based on the thickness of the initial part of the slab, such as the bottom part, which results in a deep melting margin △ over the entire surface. I was trying to take t'. Therefore, all slabs with thickness t are reduced in thickness, and since the cutting is done in the same mirror direction on the top, bottom, left, and right sides of the slab, the amount of melting increases, leading to a decrease in yield. It was the cause. An object of the present invention is to eliminate such drawbacks in the prior art and provide an economical cutting means to improve material yield.

The main focus of the present invention is to separately set the cutting allowance in the initial part of the slab to be melted, where the plate thickness is particularly thin, such as the bottom part, and the part other than the bottom part, which occupies most of the slab. However, this prevents unnecessary melting loss from occurring, and the feature is the standard for setting the melting allowance.

In the method of the present invention, a general cutting allowance t in a slab S having a thickness to is set to 0.5 to 1.0 feet, and this cutting allowance is applied to almost the entire surface of the slab except the bottom region.

Further, the cutting depth A3' at the bottom is set to be large according to the bottom thickness, and is set to 1.5 to 2. After setting the sea level, the melting and mountain allowance is successively reduced to the level of the general port cutting allowance △t. The length 1 of the bottom region is usually set to a range of 2 skins from the tail plane. The above-mentioned ranges of set values of the general cutting allowance Δt and the bottom cutting allowance Δt' and the reference length 1 of the bottom region can be changed as appropriate depending on the properties such as the depth of the eaves. When carrying out the method of the present invention, there are two methods for controlling the amount of abrasion: one method is to keep the fuel supply force of the scarfure constant and change the slab feeding speed, and the other is to keep the slab feeding speed constant. There are two methods: one that changes the amount of fuel supplied to the scarfore.

That is, as shown in FIG. 2, a control device 3 is provided which receives detection signals from a position detector 1 and a temperature sensor 2 installed on the traveling line of the slab S, and the control device 3 is provided with a is set, and commands the scarfer 4 to issue a fuel supply control signal that matches the set value, or commands the motor 6 of the slab transfer mechanism to issue a slab feed control signal that matches the set value. Keep it. The feed speed of the motor 5 is set so that a feed speed signal is fed back to the control device 3 by a pulse generator 6. Examples using the method of the present invention will be described next.

Thickness: 200mm, width: 130mm, length: low, temperature: 110mm
When cutting a 000 slab, the traverse cutting allowance for the bottom part was set to 2.0 ribs, and the initial feed rate was set to 50/m.
Cutting was started at 2 m, and the speed was gradually increased in the bottom region of 2 m, and when the cutter left the bottom region, the cutting speed was 65 m/min. Thereafter, cutting was continued over the entire surface of the slab with a cutting allowance on the 0.8 side, and as a result, an improvement in yield of 0.2% was observed. According to the fusing method of the present invention, the fusing allowance is set to be shallow according to the habit of the material surface, regardless of the wall thickness of the bottom part.
, is thicker than the conventional wall thickness, which has the effect of greatly improving walking performance.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a cross section of a slab showing how the cutting allowance is set according to the method of the present invention and the conventional method. FIG. 2 is an explanatory diagram showing the overall configuration of an apparatus for carrying out the method of the present invention. 1: Position detector, 2: Temperature detector, 3: Control device,
4: scarf, 5: motor, 6: pulse generator, S: slab. Sun's figure 2

Claims (1)

[Claims] 1. In a method for automatically cutting the surface of a high-temperature metal material after rough rolling, the cutting allowance at the initial part of the material to be cut is set within a predetermined range, and the initial area of the material to be cut is set in a predetermined range. A method for cutting metal materials, characterized in that cutting is performed by gradually reducing the cutting allowance as the material passes through. 2. The method of melt cutting a metal material according to claim 1, wherein a scarfure having a certain melt cutting ability is used and the moving speed of the material to be melted is changed to fluctuately control the cutting stock.