KR20040051064A - Blade for Hot Saw - Google Patents

Abstract

PURPOSE: A hot saw blade is provided to prevent the generation of cut chips in cutting a billet and the formation of a crack in a blade. CONSTITUTION: A hot saw blade has a V-shaped recess in a saw blade(201) and many holes(202) radially formed on the body of a blade(200). The V-shaped recess is formed in the rotating direction of the blade. The V-shaped recess minimizes the contacting area of the blade and a billet(100). Since the contacting area is reduced, the cutting resistance is reduced and a cut chip is not produced. The holes of the blade suppresses the generation of crack, vibration and noise.

Description

Hot Saw Blade {Blade for Hot Saw}

The present invention relates to a hot-saw blade of a hot-saw machine that cuts the finished rolling in a steel slab process for manufacturing a performance room with a billet for wire rod, and more particularly, a cutting occurring during a billet-cutting process. It is related to a hot saw blade to prevent the generation of snow and to prevent the occurrence of cracks.

Billet 100, which is used as a material for wire rods in a steel mill in a steel mill, is manufactured in a steel slab factory. A billet of several tens of meters in length is rolled and cut into a suitable length (10.1 m) using a hot saw. At this time, the hot saw machine is cut in the vertical direction of the longitudinal direction from the upper surface of the billet.

However, the hot sawing machine used for cutting in the conventional working method simply cut the billet 100 while processing a high-speed rotation using a motor after the heat treatment by simply processing the saw blade 103 flat on a circular high carbon steel sheet.

At this time, the billet is cut by the rotational force by the high speed rotation, the temperature of the billet is raised to 1000 ℃ or more due to the cutting resistance, so that the saw blade 103 is easily worn, cracks 102 between the saw blade and the saw blade Also, the cutting edge 104 is generated as shown in FIG. 1 as the final portion of the billet edge is not cut and the braid is pushed down by force. If the cutting tongue 104 attached to the billet 100 is rolled as it is in the wire rod process, which is a later step, the cutting tongue 104 is attached to the wire rod rolling roll (not shown) to break the rolling roll, or Interfering with the process, the material during rolling causes a large accident to leave the rolling line. In addition, the cutting tongue 104 is attached to the wire rod rolling roll and sticks to the wire rod product during rolling to generate wire rod surface defects. In addition, there is a disadvantage in that the life is shortened by the occurrence of excessive cracks between the saw blade and the saw blade due to the load according to the cutting resistance, there was a lot of problems such as noise generated during the cutting operation worsens the working environment.

The present invention has been invented to solve the above problems, an object of the present invention is to provide a hot saw blade that can prevent the generation of cracks in the blade without cutting the billet.

1 is a view showing a state in which cutting cutting occurs when cutting a billet using a conventional hot saw blade.

2 is a plan view of a conventional hot saw blade;

3 is a detailed view of a saw blade of a conventional hot saw blade;

4 is a plan view of a hot saw blade according to the present invention;

5 is a detailed view of a saw blade of a hot saw blade according to the present invention.

Figure 6 is a view showing the working state of the hot saw blade according to the present invention.

※ Explanation of main code of drawing ※

100: Billet Billet 101: Blade

102: crack 103: saw blade

104: cutting blade 200: blade

201: saw blade 202: hole

In order to achieve the above object, the hot saw blade of the present invention is a hot saw blade in which a plurality of saw blades are formed along the outer circumference of a circular blade, wherein the saw blade is formed along the direction in which the blade rotates on the saw blade. It is done.

Here, the angle of the V-groove is characterized in that processed to an angle of 30 degrees to 60 degrees.

In addition, in order to prevent cracking and vibration, a plurality of holes are formed at equal intervals in an annular shape with respect to the central axis of the blade in a portion adjacent to the saw blade.

Hereinafter, the hot saw blade of the present invention will be described with reference to the accompanying drawings.

The hot saw blade has a V groove formed in the saw blade 201, and a plurality of holes 202 are formed in the blade 200 in an annular shape.

Each saw blade 201 formed on the outer circumference of the hot saw blade forms a V groove in a direction in which the blade 200 rotates. Since the V-groove is formed in the saw blade 201, the contact area in contact with the billet is minimized when the billet is cut, so that cutting snow does not occur and the cutting resistance is reduced.

At this time, the angle of the V groove may be a variety of cases, preferably to have an angle of 30 to 60 degrees.

In addition, a plurality of holes 202 are annularly formed on the outer side of the blade 200, that is, the portion adjacent to the saw blade, so as to suppress the occurrence of cracks, vibrations, and noises due to cutting operations.

Hot saw blade of the present invention having the configuration as described above has the following action.

When the V-groove is formed in the saw blade 201, the cutting resistance is reduced in accordance with the reduction of the contact surface, thereby reducing the sliding phenomenon, so that the cutting tip 104 does not occur. Since the sliding phenomenon is reduced, the billet 100 is cut only by the rotational force of the saw blade 201 formed on the outer circumference of the blade 200, so that the conventional blades are cut by the sliding phenomenon. The blade 104 does not generate cutting edges 104.

This is also supported by Friedrich's cutting resistance formula, and according to the following cutting resistance formula, it can be seen that the cutting resistance is proportional to the cross-sectional area.

Fc = ap × f × ks

(Fc: cutting resistance (kgf), ap: cutting depth (mm), f: stroke (mm), ks specific cutting resistance (kgf / mm2)

Here, since the product of the cutting depth and the stroke is the cross-sectional area, the cutting resistance is proportional to the cross-sectional area.

When applied in the steel slab factory using the hot saw blade according to the present invention, the angle of the V groove can be obtained as follows.

division Saw blade shape Angle Cutting frequency Truncated snow Breaking snow occurrence rate (%) Prior art - none 50 45 90 The present invention V 90 50 25 50 75 50 20 40 60 50 2 4 45 50 One 2 30 50 3 6 15 50 20 40

As can be seen from the table, when the V-groove is formed in the saw blade 201, it can be seen that the occurrence of the cutting groove 104 is significantly reduced, and particularly, when the V-groove is processed at 30 to 60 degrees, the cutting groove 104 is almost It can be seen that it does not occur.

Hot saw blade of the present invention having the configuration and action as described above can be expected the following effects.

In the steel sheet manufacturing process, the wire billet can be cut without generating cutting snow, thereby preventing problems in the subsequent process, and also reducing the cracks and vibrations between the saw blade and the saw blade, thereby improving the life and reducing the noise. There is.

Claims (3)

In the hot saw blade formed with a plurality of saw blades along the outer circumference of the circular blade, Hot saw blade, characterized in that the V groove is formed in the saw blade 201 along the direction in which the blade 200 rotates. The method of claim 1, Hot-saw blades, characterized in that the angle of the V groove is processed at an angle of 30 to 60 degrees. The method of claim 1, Hot saw blade, characterized in that a plurality of holes 202 are formed at equal intervals in an annular shape with respect to the central axis of the blade 200 in the portion adjacent to the saw blade 201 to prevent cracks and vibration.