JP2000094202A - Material cutting method and carbide tool used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting tool capable of performing efficient cutting work to remove scales under high-temperature reducing atmosphere. SOLUTION: This material cutting method uses a carbide tool, which contains at least one compound selected from a carbide of groups IV, V or VI elements, a nitride and a carbonitride as a component for forming a hard phase and at least one metal selected from Co, Ni and Cr as a component for forming a metallic binder phase, and uses a cemented carbide having the content of the metallic binder phase set to 0.3 to 20 wt.% as a cutting member. A target material is cut at a cutting speed of 5 to 100 m/s and at a target material temperature of 600 to 1,200 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cemented carbide tool used in an apparatus for pressing and joining a rear end of a rolled material and a leading end of a succeeding rolled material in a hot rolling facility and the cemented carbide tool. And a method for cutting a rolled material using the same.

[0002]

2. Description of the Related Art Conventionally, in a hot rolling mill (hot strip mill), bar materials rolled by a rough rolling mill are individually supplied to a finishing mill to obtain a strip material having a desired thickness.

However, such means cannot uniformly roll the entire rolled material, and defects are likely to occur at the leading and trailing ends of the rolled material. For this reason, the yield of the rolled material decreases, and
There was a problem that it was difficult to increase the rolling speed because of biting and slippage.

[0004] In order to solve this problem and continuously supply the rolled material to the finish rolling mill, a joining apparatus for joining the rear end of the preceding rolled material and the front end of the next rolled material has been studied.

[0005] For example, the joining method described in JP-A-63-93408 is to form a loop in a rolled material and press the rear end and the front end of the rolled material. However, according to this method, since a relatively thick bar material is formed in a loop shape, the bar material is easily bent, and a sufficient joining time cannot be secured. The joining method described in Japanese Patent Publication No. 5-139 is an apparatus for welding and joining a rear end of a preceding rolled material and a front end of a subsequent rolled material while traveling with the rolled material. However, since it takes a long time to weld a wide rolled material, the entire equipment tends to be long.

[0006] Further, the joining method described in Japanese Patent Application Laid-Open No. 8-252677 is a method in which a rolled material immediately after rolling is pressed in a high temperature state. Specifically, the rolled material is run in the rolling direction with the leading end of the succeeding rolled material advanced from the rear end of the preceding rolled material, and the preceding rolled material has a higher height than the subsequent rolled material. Position, the rear end of the preceding rolled material and the leading end of the succeeding rolled material are held horizontally, and the rear end lower surface of the preceding rolled material and the leading end upper surface of the succeeding rolled material are kept in a reduced state. While maintaining the reduced state, the scale is removed by cutting only that portion discontinuously in the width direction of the rolled material,
Thereafter, in the reduced state, the rear end of the preceding rolled material and the front end of the succeeding rolled material are pressed into contact with each other to perform overlap joining.

[0007]

Since the above-mentioned method is a cutting operation at a high temperature, the stability of the cutting tool at a high temperature is required. However, in the above publication, regarding the material of the cutting tool that greatly contributes to the stability of the cutting tool,
Not specifically mentioned.

As an example of using a cutting tool under high temperature,
Japanese Patent Application Laid-Open No. 8-118129 discloses a method of cutting a work material at a high temperature exceeding 1000 ° C. using a rotary blade adjusted to a cutting speed of 50 to 120 m / s. In this method, S5 such as used with a hot saw or the like is used.
It is stated that a rotary blade made of 5C (carbon steel for machine structure) or SNC (nickel-chromium steel) is used while being cooled.

However, in order to cut a work material at a high temperature exceeding 1000 ° C. using a rotary blade made of the above material, it is necessary to minimize the contact time between the rotary blade and the work material. There is. In order to efficiently cut a work material with a short contact time, it is necessary to increase the cutting speed as much as possible. For this reason, it is considered that the cutting speed of the rotary blade needs to be set near the upper limit of 120 m / s even in the above range, but it is not realistic to set the cutting speed of the rotary blade to such a high speed. Further, in order to realize this cutting speed, equipment such as protective equipment becomes large-scale, and the cost increases, which is not practical.

Further, in the cutting process for removing the scale, the work material is at a high temperature, and the process is performed in a reducing atmosphere in order to suppress the formation of an oxide film. For this reason, it becomes a severe environment for the rotary blade, and even if a rotary blade made of S55C, SNC, or the like is used, the rotary blade is severely damaged, the frequency of replacing the rotary blade is increased, and the production efficiency is reduced.

Accordingly, an object of the present invention is to provide a cutting tool capable of efficiently performing a cutting process for removing scale under a high-temperature reducing atmosphere.

[0012]

According to the present invention, a carbide of a Group 4, 5, or 6 element,
Co, having at least one compound selected from nitrides and carbonitrides, as a component forming a bonded metal phase,
Cutting using a cemented carbide tool containing at least one metal of Ni or Cr and having a cutting member formed of a cemented carbide having a content of the binder metal phase of 0.3 to 20% by weight; Speed 5-100m / s, work material temperature 600-1
The above problem was solved by cutting the work material at 200 ° C.

Since cutting is performed at the above-mentioned cutting speed using the above-mentioned predetermined cemented carbide, cutting can be performed even under high temperature conditions, and wear of a cutting member formed of the cemented carbide can be suppressed. Can be prevented. For this reason, the service life of the tool is extended, and cutting can be performed efficiently.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. The cemented carbide tool according to the present invention is a cutting tool to which a cutting member formed of a cemented carbide 32 is attached.

The cemented carbide 32 contains a binding metal phase forming component and a hard phase forming component. Specifically, as shown in FIG. This is a state in which the hard phase 34 is dispersed. The hard phase 34
Is a carbide of a Group 4, 5, or 6 element,
It has at least one compound of nitride or carbonitride. Group 4 elements include Ti, Zr, Hf, etc., and Group 5 elements include V, Nb, Ta, etc.
Group 6 elements include Cr, Mo, W and the like.

The component forming the binding metal phase 33 contains at least one metal of Co, Ni or Cr. The content ratio of the binding metal phase 33 is
Preferably, the content is 0.3 to 20% by weight based on the total weight of the composition 2. When the content is less than 0.3% by weight, the bonding metal phase 33 is reduced, so that the strength of the cemented carbide as a whole may decrease. On the other hand, if the content exceeds 20% by weight, the hard phase 34 decreases, and the hardness of the cemented carbide as a whole may decrease. The cemented carbide 32 is obtained by mixing and sintering the powdery binding metal phase forming component and the powdery hard phase forming component.

The components forming the above-mentioned bonded metal phase 33 include C
It is sufficient that at least one metal is included among o, Ni, and Cr, and among them, it is preferable that Cr contains at least 1% by weight. When Ni or Co is contained in the binding metal phase 33, the wear resistance at high temperatures is improved.

The average thickness (X) of the bonding metal phase 33 shown in FIG. 1A, that is, the average distance between the hard phase 34 and the adjacent hard phase 34 is not particularly limited. It is preferably 7 μm. When X exceeds 0.7 μm, the amount of welding of the high-temperature work material component to the cemented carbide tool is increased, and a chipped portion may occur in the cemented carbide tool together with the loss of welding.

Co, Ni or C in the above-mentioned bonded metal phase 33
The content ratio of the total amount of r to the entire cemented carbide 32 is a,
Assuming that the content ratio of the total amount of carbides, nitrides and carbonitrides of Ti, Ta and Nb in the hard phase 34 to the entire hard phase 34 is b, the following conditions are preferably satisfied. 0.3 ≦ a ≦ 12 or 12 <a ≦ 20 and b ≧ 6a-40.

When the above formula is satisfied, the hardness and rigidity of the cemented carbide are improved, and the fine cutting of the cemented carbide cutting member is suppressed. In the case of the above formula, the hardness of the cemented carbide is decreasing because the bonding metal phase increases, but the Ti, Ta, and Nb compounds having excellent high-temperature properties in the hard phase are increased. As described above, the hardness is improved, and the rigidity is also improved as a whole.

As shown in FIG. 1B, the outermost surface of the cutting member made of the above-mentioned cemented carbide 32 is made of TiC,
The coating layer 35 made of at least one of TiN, TiCN, Al ₂ O ₃ or TiAlN can be formed. When the coating layer 35 is provided, the welding of the rolled material can be suppressed when used in the rolled material joining apparatus, and the life of the cutting member and thus the life of the tool can be extended.

The cutting tool to which the cutting member formed from the above-mentioned cemented carbide 32 is attached, that is, a cemented carbide tool is used for cutting a work material such as steel such as a rolled plate. The cutting conditions include a temperature of a work material (hereinafter, referred to as a “work temperature”) of 600 to 1200 ° C. shown in a region A of FIG.
The cutting speed is 5 to 100 m / s. Since the work temperature is 600 to 1200 ° C., a work material such as a rolled plate in a high temperature state can be directly cut without lowering the temperature. Also, the cutting speed is 5 to 100 m /
Because of s, the cutting speed is reduced as compared with the conditions described in JP-A-8-118129. For this reason, it is possible to cut a workpiece such as a hot rolled plate without using a special power, a protective device, or the like. Cutting speed of 5
The reason why it can be reduced to 100 m / s is that a cemented carbide composed of the above-described hard phase and the binding metal phase is used. By employing the above cutting conditions, the erosion and wear of the cemented carbide tool are reduced, and the life of the cemented carbide tool is prolonged.

The above cutting conditions are as follows:
Region B in FIG. 6, that is, a range where the cutting speed is 5 to 100 m / s and the workpiece temperature is 600 to 900 ° C.
A range in which the cutting speed is 5 to 50 m / s and which satisfies one of the ranges in which the workpiece temperature is 600 to 1200 ° C. is preferable, and the region C in FIG. 6, that is, the cutting speed is 5 to 50 m / s. And work temperature 600 to 12
The range where the temperature is 00 ° C. is more preferable, and the range where the cutting speed is 5 to 50 m / s and the work temperature is 900 to 1200 ° C. is more preferable in the region D in FIG. Even within the range of the region A, if the cutting speed is set to 5 to 50 m / s, it is possible to perform safer and more stable cutting. Further, when the work temperature is increased to 900 to 1200 ° C., the work material tends to be softened, and the cutting becomes easier.

Next, a high-temperature cutting method in a rolling joining apparatus using a cylindrical cutter 19a as a cemented carbide tool to which the cemented carbide 32 is attached will be described with reference to FIGS. In each drawing, the same reference sign indicates the same meaning.

FIG. 2 is a side view showing the configuration of the rolled material joining apparatus. FIG. 3 is a detailed view focusing on the processing device and the reduction holding device. In FIG. 2, the rolled material joining apparatus 10 is in the rolling direction (the direction of the arrow pointing from the right to the left in FIG. 2).
, A rear end clamp device 14 mounted on the trolley 12 and capable of vertically moving while horizontally supporting the rear end of the preceding rolled material 1, and a subsequent rolled material 2 mounted on the trolley 12 Tip clamp device 16 that horizontally supports the tip
A processing device 18 for cutting the rear end lower surface of the preceding rolled material 1 and the front end upper surface of the subsequent rolled material 2; a reduction holding device 20 for holding the processed surface in a reduced state; There is provided a pressure welding device 22 for superimposing the processing surfaces of the material 2 and compressing and joining the rolled materials 1 and 2 to substantially the same thickness as the rolled materials 1 and 2.

In FIG. 3, the rear end clamping device 14 is
A plurality of rollers 1 for horizontally supporting the rear end of the preceding rolled material 1
5a, a clamp 15b supporting the rear end of the preceding rolled material 1 between the rollers 15a and moving up and down, and a processing height for bringing the lower end of the rear end of the preceding rolled material 1 into contact with the upper surface of a cylindrical cutter 19a described later. H and a press-contact height L that keeps the rear end of the preceding rolled material 1 at substantially the same height as the front end of the succeeding rolled material 2, from the lifting cylinder 15c that moves the roller 15a and the clamp 15b up and down. Become. With this configuration, the rear end of the preceding rolled material 1 can be supported by the clamp 15b while the rear end of the preceding rolled material 1 is horizontally supported by the rollers 15a. The roller 15a and the clamp 15b are held at the processing height H by the lifting cylinder 15c, and the lower surface of the rear end portion of the preceding rolled material 1 can be cut by the cylindrical cutter 19a. Pre-rolled material 1
And the processed surface of the succeeding rolled material 2 can be overlapped and compressed and joined by the pressure welding device 22.

The tip clamping device 16 includes a roller 17a for horizontally supporting the tip of the succeeding rolled material 2 and a roller 17a.
Clamp 17 which supports the leading end of the succeeding rolled material 2
b. With this configuration, the tip of the succeeding rolled material 2 can be supported by the clamp 17b while the succeeding rolled material 2 is held horizontally by the roller 17a. The processing device 18 includes a cylindrical cutter 19a that rotates about an axis Z in the width direction of the rolled materials 1 and 2, and an arm 1 that rotatably supports the cylindrical cutter 19a at one end and swings about the other end.
9b, a swinging device 19c for swinging the arm 19b in an oblique direction, a reciprocating device 19d for moving the swinging device 19c back and forth in the rolling direction, a swinging device 19c and a reciprocating device 19d.
Is supported on an inclined surface inclined downward in the rolling direction, and is fixed to the carriage 12. Cylindrical cutter 19
a is attached to the tip of the arm 19b and is rotated by a rotation driving device (not shown). The cylindrical cutter 19a separates the lower surface of the rear end portion of the preceding rolled material 1 and the upper surface of the distal end portion of the succeeding rolled material 2 separately at the processing positions indicated by solid lines in FIGS. 2 and 3 by the swinging device 19c and the reciprocating device 19d. After cutting, and retracted to the position shown by the dashed line.

The reduction holding device 20 includes a coke oven gas, L
Combustible gas such as PG, LNG, etc. is burned with less oxygen than the amount for complete combustion to generate a reducing flame, and is formed of reducing flame burners 20a and 20b for preventing oxidation by spraying on a processing surface. In the frame of 15a,
The reducing flame burner 20 b is connected to the cart 1 via the fixed stand 21.
2, a reducing gas is blown toward the processing surfaces of the preceding rolled material 1 and the succeeding rolled material 2 to keep the cut surface in a reduced state at all times. A plurality of reducing flame burners 20a and 20b are provided in the width direction of the rolled materials 1 and 2, and are arranged so as to cover the processing surface with the reducing cutting flame.

In the pressing device 22, an upper die 23a having a lower surface in contact with the upper surface of the rear end portion of the preceding rolled material 1;
Mold 23b having an upper surface in contact with the lower surface of the front end of the mold, and press device 2 for supporting and compressing upper mold 23a and lower mold 23b
3c. The lower mold 23b is fixed to the carriage 12. The upper die 23a is a ram 23e of a press device 23c.
And moves up and down with the ram 23e. With this configuration, during processing by the processing device 18, the rear end of the preceding rolled material 1 and the front end of the succeeding rolled material 2 are moved to the upper die 23 a
And by lowering the ram 2e with the pressing device 23c, the working surfaces of the preceding rolled material 1 and the succeeding rolled material 2 are overlapped and compressed,
The thickness can be substantially the same as the rolled materials 1 and 2.

In FIG. 2, the truck 12 has a plurality of wheels 13
And runs on a rail 3 extending in the rolling direction. At the time of pressure contact, the vehicle travels to the left on the drawing as indicated by the arrow. When the rolling height of the rolling device is B, the plurality of rollers 4 support the rolled material 1 at the rolling height B and move the rolled material 1 in the rolling direction. The rail 3 is disposed at a position straddling the roller 4, and the press contact height L (see FIG. 3) is higher than the rolling height B so that the bogie 12 can travel at a position higher than the rail 3. Rolled materials 1 and 2 are rolled from the rolling height B of the rolling device to the tip clamping device 1
6 and the rolling height B from the rear end clamping device 14
The tilt guides 24 and 25 that can swing up and down are provided. Thereby, the existing rolling mill can be operated as it is.

Next, the first operation will be described. FIG. 4 shows the processing of the joint surface of the cylindrical cutter 19a in the first operation and the blowing of the reducing flame to the processing surface by the reducing flame burners 20a and 20b. The arrow from the right to the left in the drawing indicates the rolling direction. In FIG. 3, the preceding rolled material 1 and the succeeding rolled material 2 are overlapped at a predetermined interval by the roller 15a of the rear end clamp device 14 and the roller 17a of the front end clamp device 16, and the respective positions are set by the clamps 15b and 17b. Fix it. The distance between the rolled materials 1 and 2 is slightly larger than the diameter of the cylindrical cutter 19a. The width at which the rolled material 1 and the rolled material 2 are overlapped is about 50 to 100 mm depending on the thickness of the rolled materials 1 and 2. Cylindrical cutter 19
As shown in FIGS. 3 and 4, a moves along the locus indicated by the rotation of the arm 19b, and then operates the reciprocating device 19d to move along the locus indicated by the inclined surface of the inclined base 19e. Then, the machined surface 2a on the top surface of the leading end of the subsequent rolled material 2 is machined diagonally. Simultaneously with the processing, a reducing flame is blown from the reducing flame burner 20b to the processing surface 2a to remove scale and prevent oxidation, and to blow off chips generated by the processing. When the processing of the processing surface 2a on the upper surface of the leading end of the succeeding rolled material 2 is completed, the cylindrical cutter 19a is raised by the trajectory indicated by turning the arm 19b and enters the trajectory indicated by the reciprocating device 19d. The processing surface 1a on the lower surface of the rear end is processed.

When the cylindrical cutter 19a rises, the processing surface 2a on the top of the leading end of the succeeding rolled material 2 and the cylindrical cutter 19
Since the gap with the opening a is widened, the reducing flame can be sufficiently blown onto the processing surface 2a by the reducing flame burner 20b. Along with the start of processing of the processing surface 1a on the lower end of the rear end of the preceding rolled material 1, a reducing flame is blown onto the processing surface 1a by the reducing flame burner 20a to remove scale and prevent oxidation, and to blow off chips generated by the processing. When the processing is completed, the cylindrical cutter 19a is retracted to the position shown by the dashed line in FIG.

Next, the elevating cylinder 15c is lowered to lower the preceding rolled material 1 to the press contact height L. At this time, since the reducing flame burner 20a descends together with the roller 15a, the reducing flame can be blown during the descending until the processing surface 2a of the succeeding rolled material 2 adheres to the processing surface 1a of the preceding rolled material 1. The reducing flame burner 20b starts blowing the reducing flame to the processing surface 2a at the same time as the processing of the subsequent rolled material 2 starts, and then blows the reducing flame until the processing surface 1a adheres to the processing surface 2a.
Next, the press device 23c of the press contact device 22 operates, and the ram 2
3e is lowered and pressure welding is started. As a result, the bonding surfaces are bonded without an oxide film, and sufficient and stable strength can be obtained. In addition, it is possible to prevent foreign substances such as cutting powder generated during processing from being mixed into the joint surface.

Next, a second operation of the embodiment will be described. FIG. 5 shows the processing of the joint surface of the cylindrical cutter 19a in the second operation and the blowing of the reducing flame onto the processing surface by the reducing flame burners 20a and 20b. The arrow from the right to the left in the drawing indicates the rolling direction.

This operation is performed after the pre-rolled material 1 is processed.
The subsequent rolled material 2 is processed. The cylindrical cutter 19a moves along the locus indicated by the rotation of the arm 19b, and then operates the reciprocating device 19d to move along the locus indicated by the inclined surface of the inclined table 19e, and after rising, moves up the reciprocating device. 19
By actuating d, it moves along the locus of the inclined platform 19e along the locus indicated by, and the oblique machining of the processed surface 1a on the lower surface of the rear end portion of the preceding rolled material 1 is performed. Reduction flame burner 20a at the same time as processing
A reducing flame is blown onto the processing surface 1a to remove scale and prevent oxidation, and to blow off chips generated by the processing.
When the processing surface 1a on the lower surface of the rear end portion of the preceding rolled material 1 has been processed, the arm 19b is rotated to descend the cylindrical cutter 19a to enter the locus indicated by the reciprocating device 19d, and the upper surface of the leading end portion of the subsequent rolled material 2 The processing surface 2a is processed. The lowering of the cylindrical cutter 19a increases the distance between the processing surface 1a at the rear end lower surface of the preceding rolled material 1 and the cylindrical cutter 19a, so that the reducing flame burner 20a can sufficiently blow the reducing flame onto the processing surface 1a.

At the same time as the processing of the processing surface 2a on the upper end portion of the subsequent rolled material 2 is started, a reducing flame is blown to the processing surface 2a by the reducing flame burner 20b to remove scale and prevent oxidation, and to blow off chips generated by the processing. . When the processing is completed, the cylindrical cutter 19a is retracted to the position shown by the dashed line in FIG. The subsequent pressing operation is the same as the first operation.

[0037]

EXAMPLES (Example 1) An experiment was conducted using the rolled material joining apparatus shown in FIGS. A cutting member formed of a cemented carbide was used as a blade of the cylindrical cutter 19a of the rolled material joining apparatus. The composition of the bonding metal phase and the hard phase in the cemented carbide was as shown in Table 1. The average thickness of the bonded metal phase measured by the image analysis method, that is, the average distance between the hard phase and the adjacent hard phase (hereinafter, abbreviated as “X”) is as follows.
It was 0.6 μm. The rolled material was cut and joined at a high temperature using the cylindrical cutter 19a. Cutting conditions are
Rolling material transport speed (that is, cutting speed) 30 m / s,
The transfer speed f of the work material was 0.68 mm / tooth, the cut into the rolled material was 5 mm, and the work temperature was 1050 ° C. The wear amount of the carbide cutter at that time was measured. Table 1 shows the results.

[0038]

[Table 1]

As a result, it was found that abrasion was smaller when Ni was selected as the binding metal than Co. Further, it was found that when Cr was contained, the wear was reduced.

Example 2, Comparative Example 1 An experiment was conducted in the same manner as in Example 1, using a rolled material joining apparatus. At this time, the binder metal phase and the hard phase in the cemented carbide used as the cutting member of the cylindrical cutter 19a had the compositions shown in Table 2. X was 0.65 μm. Using this cylindrical cutter 19a, under the same conditions as in Example 1,
The rolled material was cut and joined. The amount of wear of the cutting member of the cylindrical cutter 19a at that time was measured. Table 2 shows the results.

[0041]

[Table 2]

As a result , when the amount of Co in the bonded metal phase is 12% by weight or less, the amount of wear is small. When the amount of Co exceeds 12% by weight, wear is severe.
It became clear that welding was easy to occur.

Example 3 and Comparative Example 2 In the same manner as in Example 1, an experiment was conducted using a rolled material joining apparatus. At this time, the composition and X of the bonding metal phase and the hard phase in the cemented carbide used as the cutting member of the cylindrical cutter 19a are as shown in Table 3. The rolled material was cut and joined under the same conditions as in Example 1 using this cylindrical cutter 19a. The amount of wear of the cutting member of the cylindrical cutter 19a at that time was measured. Table 3 shows the results.

[0044]

[Table 3]

As a result , it was clarified that the smaller the value of X, the smaller the amount of abrasion.

Example 4 and Comparative Example 3 In the same manner as in Example 1, an experiment was performed using a rolled material joining apparatus. At this time, the bonding metal phase and the hard phase in the cemented carbide used as the cutting member of the cylindrical cutter 19a had the compositions shown in Table 4. X was 0.5 μm. The rolled material was cut and joined under the same conditions as in Example 1 using this cylindrical cutter 19a. The amount of wear of the cutting member of the cylindrical cutter 19a at that time was measured. Table 4 shows the results.
Shown in In Table 4, “whole” in the column of hard phase refers to the ratio of the entire hard phase to the entire cemented carbide. Further, the “components” in the column of the hard phase refer to each component that forms the hard phase, and the ratio refers to the abundance ratio of each component to the entire hard phase. Further, in Table 4, (Ti, Ta, N
b) CN refers to a carbonitride of Ti, Ta and Nb,
The composition ratio is Ti: Ta: Nb = 5: 1: 1 (weight ratio).

In Table 4, “expression conditions” include “a” and “b”.
Is represented by “○” when the relationship satisfies any of the following formulas or formulas, and “x” is represented when neither of the formulas or formulas is satisfied. 0.3 ≦ a ≦ 12 12 <a ≦ 20 and b> 6a-40 Here, in Table 4, a represents the abundance ratio of Co in the bonded metal phase to the entire cemented carbide, and (Ti) in the hard phase. ,
The ratio of Ta, Nb) CN to the entire hard phase is represented by b
And

[0048]

[Table 4]

As a result, it has been clarified that when the above equation or the above equation is satisfied, the amount of wear is small. On the other hand, in Comparative Sample 5, the welding defect was large, and in Comparative Samples 6 to 8, the welding was large.

Example 5 An experiment was conducted in the same manner as in Example 1 using a rolled material joining apparatus. The bonding metal phase and the hard phase in the cemented carbide used as the cutting member of the cylindrical cutter 19a at this time had the compositions shown in Table 5. At this time, the coating layer shown in Table 5 was formed on the outer surface of the cemented carbide phase. X was 0.6 μm. In addition, in the sample 19 of Table 5, the coating layer is “Al ₂ O ₃ + TiC” and the thickness is 3.5 μm.
"" Means that 0.5 μm of TiC was provided as a base layer, and 3 μm of Al ₂ O ₃ was provided thereon. The same applies to a sample 23 in Table 6 described later. The rolled material was cut and joined under the same conditions as in Example 1 using this cylindrical cutter 19a. The amount of wear of the cutting material of the cylindrical cutter 19a at that time was measured. Table 5 shows the results.

[0051]

[Table 5]

As a result , it became clear that the amount of abrasion was smaller when the coating layer was formed.

Example 6 and Comparative Example 4 An experiment was conducted using a rolled material joining apparatus in the same manner as in Example 1. At this time, the composition of the binding metal phase and the hard phase, X, the composition of the coating layer, and the thickness thereof in the cemented carbide used as the cutting member of the cylindrical cutter 19a are as shown in Table 6. Using this cylindrical cutter 19a, Tables 7 and 8
The rolled material was cut and joined under the following conditions. The amount of wear of the cutting member of the cylindrical cutter 19a at that time was measured. The results are shown in Tables 7 and 8.

[0054]

[Table 6]

[0055]

[Table 7]

[0056]

[Table 8]

As a result, when the workpiece temperature is 800 ° C., cutting can be performed at a cutting speed of 5 m / s (conditions 1 to 3), but the cutting speed is 50 to 80.
At m / s (conditions 4 to 9), the amount of welding and the amount of wear are reduced, and the life of the cemented carbide cutter is prolonged. In addition, cutting speed 100m /
In s (conditions 10 to 12), the amount of welding and wear is slightly increased, and the life of the cemented carbide cutter is slightly shortened. In contrast, when the cutting speed was 120 m / s (comparative conditions 1 to 3), chipping due to vibration occurred. Next, the cutting speed is 80m /
In the case of s, when the work temperature is 500 ° C. (comparative conditions 4 to 6), the welding and the abrasion cannot be performed seriously.
At ℃ (conditions 13 to 15), the amount of welding and the amount of wear are reduced, which is favorable. The work temperature is 1200 ° C. (conditions 16 to 1).
In 8), cutting is possible although the amount of welding and the amount of wear increase slightly. On the other hand, when the work temperature is 1300 ° C. (comparative conditions 7 to 9), the wear becomes extremely large, and the life of the cemented carbide cutter is shortened.

[0058]

According to the present invention, a part of the rear end of the preceding rolled material and a part of the leading end of the succeeding rolled material in the hot rolling equipment are heated at a high temperature in a short time. The life of the cutting tool used in the apparatus for joining with the necessary joining strength over the entire width can be extended, and the yield of the rolled material can be improved and the rolling speed can be increased.

[Brief description of the drawings]

1 (a) and 1 (b) are schematic views showing examples of a cemented carbide according to the present invention.

FIG. 2 is a side view showing the configuration of a rolled material joining apparatus.

FIG. 3 is a detailed side view mainly showing the processing apparatus and the reduction holding apparatus of FIG. 2;

FIG. 4 is a schematic view showing the movement of a cylindrical cutter.

FIG. 5 is a schematic view showing the movement of a cylindrical cutter.

FIG. 6 is a diagram showing a relationship between a cutting temperature and a work temperature.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rolled material 1a Worked surface 2 Rolled material 2a Worked surface 3 Rail 4 Roller 10 Rolled material joining device 12 Bogie 13 Wheel 14 Rear end clamp device 15a Roller 15b Clamp 15c Lifting cylinder 16 Tip clamp device 17a Roller 17b Clamp 18 Processing device 19a Cutter 19b Arm 19c Swinging device 19d Reciprocating device 19e Inclined table 20 Reduction holding device 20a, 20b Reduction flame burner 21 Fixed stand 22 Press-contact device 23a Upper die 23b Lower die 23c Press device 23e Ram 24 Incline guide 25 Incline guide 31 Tool 32 Ultra Hard alloy 33 Bonded metal 34 Hard phase 35 Coating layer H Working height L Pressing height Z Axis

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[Procedure amendment]

[Submission date] October 1, 1999 (1999.10.
1)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

Therefore, the present invention relates to a method for cutting a hot work material.
Cutting, and in a high-temperature reducing atmosphere that is an object to provide a cutting tool capable of performing efficiently cutting to remove scale.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0056

[Correction method] Change

[Correction contents]

[0056]

[Table 8]

[Procedure amendment 3]

[Document name to be amended] Drawing

[Correction target item name] Figure 2

[Correction method] Change

[Correction contents]

FIG. 2

[Procedure amendment 4]

[Document name to be amended] Drawing

[Correction target item name] Figure 3

[Correction method] Change

[Correction contents]

FIG. 3

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) C22C 29/02 C22C 29/02 Z 29/04 29/04 A C23C 28/04 C23C 28/04 30/00 30/00 C (72) Inventor Nobuyuki Kitagawa 1-1-1, Kunyokita, Itami-shi, Itami Works, Sumitomo Electric Industries, Ltd. (72) Inventor Koichi Sakamoto 4-33, Kitahama, Chuo-ku, Osaka Sumitomo Gold (72) Inventor Shigeru Yagisawa 4-33, Kitahama, Chuo-ku, Osaka City Sumitomo Gold F-term (reference) 3C022 AA02 AA10 3C046 FF03 FF16 FF25 FF32 FF39 FF50 FF53 FF55 4K044 AA09 AB10 BA18 BB11 BC01 CA22

Claims (10)

[Claims] 1. A component forming a hard phase, which belongs to Group 4 or 5
At least one compound selected from the group consisting of carbides, nitrides and carbonitrides of group 6 elements, and at least one of Co, Ni or Cr as a component forming a binding metal phase
And the content ratio of the binding metal phase is 0.3.
Using a cemented carbide tool equipped with a cutting member made of a cemented carbide of up to 20% by weight, a cutting speed of 5 to 100 m /
s, a method of cutting a work material at a work material temperature of 600 to 1200 ° C. 2. The method for cutting a work material according to claim 1, wherein the binder metal phase forming component is a component containing at least 1% by weight of Cr. 3. The method for cutting a work material according to claim 1, wherein the average thickness of the bonded metal phase is at most 0.7 μm. 4. Co, Ni or Cr in the binding metal phase
When the content ratio of the total amount of the total amount of the cemented carbide to the entire hard phase is a, and the content ratio of the total amount of carbides, nitrides and carbonitrides of Ti, Ta and Nb in the hard phase to the entire hard phase is b, 0.3 ≦ a ≦ 12 or 12 <
2. The structure according to claim 1, wherein a.ltoreq.20 and b.ltoreq.6a-40.
A method for cutting a work material according to any one of claims 1 to 3. 5. A coating member comprising at least one of TiC, TiN, TiCN, Al ₂ O _{3 and} TiAlN is formed on an outermost surface of a cutting member formed of the cemented carbide. A method for cutting a work material according to any one of the above. 6. A component forming a hard phase, which belongs to Group 4 or 5
At least one compound selected from the group consisting of carbides, nitrides and carbonitrides of group 6 elements, and at least one of Co, Ni or Cr as a component forming a binding metal phase
And the content ratio of the binding metal phase is 0.3.
A cutting member formed of a cemented carbide having a cutting speed of 5 to 100 m / s and a work material temperature of 60 is attached.
Carbide tool used for cutting work material at 0 to 1200 ° C. 7. The cemented carbide tool according to claim 6, wherein the binder metal phase forming component is a component containing at least 1% by weight of Cr. 8. The cemented carbide tool according to claim 6, wherein the average thickness of the bonded metal phase is at most 0.7 μm. 9. Co, Ni or Cr in the binding metal phase
When the content ratio of the total amount of the cemented carbide to the entire cemented carbide is a, and the content ratio of the total amount of carbides, nitrides and carbonitrides of Ti, Ta and Nb in the hard phase to the entire hard phase is b. , 0.3 ≦ a ≦ 12 or 1
The cemented carbide tool according to claim 6, wherein 2 <a ≦ 20 and b ≧ 6a-40. 10. The outermost surface of a cutting member formed of the cemented carbide is provided with TiC, TiN, TiCN, and Al ₂ O _3.
The carbide tool according to any one of claims 6 to 9, wherein a coating layer made of at least one of TiAlN and TiAlN is formed.