JP2003305614A - Rotary disc blade and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary disc blade and a method of manufacturing the rotary disc blade, capable of improving both characteristics required for a main body and characteristics required for a blade tip part. <P>SOLUTION: Flux tabs 2, 2 are provided on both end faces of the periphery of the disc main body 1. A welding wire is inserted between the flux tabs 2, 2 or in the vicinity thereof while the main body 1 is rotated. A build-up welding of the periphery of the main body 1 is performed by fusing this welding wire. After that, a blade part 7 is formed at the periphery of the main body 1 by gear cutting. At this time, the blade tip part 8 of the blade part 7 is formed from a material different from that of the main body 1. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary disk blade having a disk-shaped main body portion having a blade portion on the outer periphery thereof and a method for manufacturing the same.

[0002]

2. Description of the Related Art An integrated rotary disc blade, which is mainly used for sawing a steel material, has a disk-shaped main body formed by using carbon steel or alloy tool steel as a base material and a machined outer periphery thereof. And a blade portion having a plurality of teeth (saw blades). Generally, the main body portion and the blade portion are made of a single rolled material having the same thickness.

[0003]

By the way, in actual sawing work, hot sawing (850 to 1000 ° C.) and cold sawing (normal temperature) are performed depending on the temperature of the material to be sawed at the time of sawing. ,
This is classified as warm sawing located between the two. Here, the hot sawing is performed in order to reduce the tensile strength of the material to be sawed and enable sawing with a small force.
At this time, the blade tip portion of the blade portion that comes into contact with the material to be sawed receives cutting resistance (friction) and its temperature rises. However, since the rotary disc blades that have been conventionally used are not formed in consideration of the temperature of the material to be sawed, the rise in temperature causes the hardness of the cutting edge portion to decrease, and the material to be sawn is cut. There is a problem that wear occurs in the contact portion with. Conventionally, by quenching the blade part,
Although configured to have higher hardness than the main body,
Even with this method, the fact that the hardness is reduced cannot be avoided. Further, in the past, in order to suppress the decrease in hardness of the cutting edge portion at the high temperature, the hardenability of the cutting edge is prioritized when selecting the material, and therefore the characteristics required for the main body (toughness) Etc.) was slightly sacrificed. Further, as another method of manufacturing the rotary disc blade, the main body is formed first,
Although a method of welding a plurality of teeth one by one around it has been attempted, the fact is that it has not been put to practical use.

The present invention has been made to solve the above-mentioned conventional drawbacks, and an object thereof is to improve both the characteristics required for the main body portion and the characteristics required for the cutting edge portion. A rotary disc blade and a method for manufacturing the same.

[0005]

Therefore, the rotary disc blade of claim 1 is a rotary disc blade having a blade portion 7 on the outer periphery of a disc-shaped main body portion 1, and the blade tip portion 8 is different from the main body portion 1. It is characterized by being composed of materials.

In the rotary disc blade according to the first aspect of the present invention, by forming the body portion 1 and the blade tip portion 8 using different materials, the characteristics required for the body portion 1, such as toughness, crack resistance, and welding, can be obtained. It is possible to satisfy both the characteristics such as properties and the characteristics required for the cutting edge portion 8, for example, the characteristics such as maintaining high hardness in each temperature region.

According to a second aspect of the present invention, there is provided the rotating disc blade, wherein the blade portion 7
Is characterized in that at least the cutting edge portion 8 is formed by overlay welding.

In the rotating disc blade according to the second aspect, by using the overlay welding, the main body portion 1 and the blade tip portion 8 can be formed of different materials in an easy method.

Further, in the rotary disc blade according to claim 3, a flat wire rod 20 constituting at least a cutting edge portion 8 of the blade portion 7 is wound around the outer periphery of the main body portion 1 to form the main body portion 1 and the flat wire rod 20.
It is characterized by joining and.

In the rotating disc blade according to claim 3, the main body portion 1
Then, the main body portion 1 and the cutting edge portion 8 can be formed of different materials by an easy method of joining the rectangular wire member 20 wound around this.

Further, the rotary disc blade according to claim 4 is characterized in that the cutting edge portion 8 is configured such that the thickness thereof is larger than the thickness of the main body portion 1.

In the rotating disk blade of the above-mentioned claim 4, since the thickness of the blade tip portion 8 is made larger than the thickness of the main body portion 1, a relief is formed from the blade tip portion 8 toward the main body portion 1. At the time of sawing, a gap can be provided between the main body 1 and the material to be sawed. This makes it possible to suppress the temperature rise of the main body 1 during sawing and reduce the frictional resistance due to the contact with the material to be sawed.

Further, the rotating disk blade according to claim 5 is characterized in that the bottom portion 7b of the blade portion 7 is formed of the same material as that of the main body portion 1.

In the rotary disc blade of the fifth aspect, the bottom portion 7b of the blade portion 7 is made of the same material as that of the main body portion 1, so that the toughness and crack resistance of the bottom portion 7b can be improved. Therefore, it is possible to suppress the occurrence of defects such as cracks in the bottom portion 7b due to bending of the blade portion 7 during work.

The rotating disk blade according to claim 6 is characterized in that a steel material is used for the material of the main body 1.

In the rotary disc blade according to the sixth aspect, since the steel material is used as the material of the main body portion 1, it is possible to improve the toughness against repeated bending stress and the crack resistance, and at the same time, it is preferable. Weldability can be obtained.

A rotating disk blade according to a seventh aspect of the present invention is the blade portion 8 described above.
Nickel alloy is used for the material of which the weight ratio is chromium 15.00 to 20.00%, molybdenum 4.00 to 18.00.
%, Cobalt 15.00% or less, tungsten 1.00 to 5.00
%, Iron 5.00% or less, titanium 3.00% or less, aluminum 2.
It is characterized by containing less than 00% and the balance nickel and unavoidable impurities.

In the rotary disc blade according to claim 7, the nickel alloy is used as the material of the cutting edge portion 8, and therefore, about 1
Even when the material to be sawed in the high temperature range of 000 ° C. to 850 ° C. is sawed, high hardness can be maintained. As a result, the wear on the cutting edge portion 8 can be significantly reduced.

In the rotating disk blade of claim 8, a cobalt alloy is used as a material for the cutting edge portion 8, and its components are, by weight, chromium 25.00 to 30.00%, tungsten 12.00% or less, carbon 0.25 to 2.50%. , Iron 3.00% or less, nickel 2.50%
It is characterized in that it contains 5.00% or less of molybdenum and the balance is cobalt and unavoidable impurities.

In the rotary disc blade according to claim 8, since the cobalt alloy is used as the material of the cutting edge portion 8, about 8
It is possible to maintain high hardness when sawing a material to be sawed in a temperature range of 50 ° C to 600 ° C. As a result, the wear on the cutting edge portion 8 can be significantly reduced.

Further, in the rotating disk blade according to claim 9, tool steel is used as a material for the cutting edge portion 8, and the components thereof are 0.80 to 0.95% by weight of carbon, 3.00 to 4.50% of chromium, and 4.50 to 5.50 of molybdenum. %, Tungsten 6.00 to 7.00%, vanadium 1.50 to 2.00%, and cobalt 5.00% or less, and the balance is iron and inevitable impurities.

In the rotating disc blade according to claim 9, since tool steel is used for the material of the cutting edge portion 8, the temperature is about 600 ° C.
It is possible to maintain high hardness when sawing the material to be sawed in the following temperature regions. As a result, the wear on the cutting edge portion 8 can be significantly reduced.

According to a tenth aspect of the present invention, in the method for manufacturing a rotary disc blade, the flux tabs 2 are arranged on both end surfaces of the peripheral portion of the disc-shaped main body 1, and the main body 1 is rotated,
A welding wire is inserted between the flux tabs 2 and 2 and in the vicinity thereof, and the outer periphery of the main body portion 1 is welded by overlay welding by melting the welding wire, and then the blade portion 7 is formed by performing gear cutting processing. It is characterized in that it is configured to form.

In the method for manufacturing a rotary disc blade according to the tenth aspect, the blade portion 7 is formed on the outer periphery of the main body portion 1 by overlay welding, so that a material suitable for each portion is used. The rotating disc blade can be easily formed. Further, by adopting such a build-up welding method, it is possible to freely manufacture the rotary disk blade having different thicknesses between the main body 1 and the blade portion 7, or the blade portion 7 having a special shape.

Further, the manufacturing method of the rotary disc blade according to claim 11 is characterized in that the thickness of the cutting edge portion 8 of the blade portion 7 is formed to be larger than the thickness of the main body portion 1.

In the method for manufacturing a rotary disc blade according to claim 11, the thickness of the cutting edge portion 8 is made larger than the thickness of the main body portion 1, so that a clearance is formed from the cutting edge portion 8 toward the main body portion 1. Therefore, at the time of sawing, the main body 1
A gap can be provided between the saw and the material to be sawn. This makes it possible to suppress the temperature rise of the main body 1 during sawing and reduce the frictional resistance due to the contact with the material to be sawed.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION Next, specific embodiments of the rotary disk blade and the manufacturing method thereof according to the present invention will be described in detail with reference to the drawings. In the first embodiment of the present invention, a method of forming a blade portion on the outer circumference of a main body portion of a rotary disc blade will be described. FIG. 1 is a schematic configuration diagram of an entire manufacturing apparatus for a rotary disc blade according to the first embodiment. In FIG. 1, the manufacturing apparatus is mainly a welding apparatus 10 for overlay welding.
And an electric furnace 15 having a built-in heater and a controller 16 for controlling the electric furnace 15. The electric furnace 15 and the controller 16 constitute a heat treatment apparatus 17. Further, FIG. 2 is a schematic configuration diagram showing a part of the welding device 10 and FIG. 3 is a partially enlarged sectional view thereof.

First, the welding device 10 will be described. In FIG. 2, reference numeral 1 denotes a main body formed of a steel material in a substantially disc shape, and a plurality of flux tabs 2 are provided around the main body 1. Flux tab 2 above
2 is composed of 8 pairs of tabs 2 and 8 of which one side is divided into eight (one side is 16 pieces) and the other side is 16 sides. Has been. At this time, each of the flux tabs 2 and 2 is configured to be supported on both sides of the body 1 by, for example, magnets 3 and 3 arranged on the inner peripheral side of the body 1 (see FIG. 3). ). Then, a welding wire (not shown) is inserted in the vicinity of the outer peripheral portion 1a of the main body portion 1 located between the flux tabs 2, and the welding wire is melted using the welding torch 4, whereby the main body portion 1 Outer peripheral portion 1a
The weld metal 5 is constructed so as to be overlay welded. At this time, since the opposite end faces 2a, 2a of the flux tabs 2, 2 facing each other are formed as tapered faces that spread outward from the contact portions at both ends of the main body 1, the thickness of the deposited metal 5 is , Which is larger than the thickness of the main body portion 1 and is formed in a tapered shape with a divergence.

Next, the heat treatment apparatus 17 will be described. In FIG. 1, reference numeral 11 is a substantially rectangular case for heat insulation and heat retention, and is configured so that a substantially disk-shaped main body 1 having the above-mentioned flux tabs 2 and 2 is housed therein. The case 11 has a cover portion 11a that is horizontally slidable on one end side of the upper portion thereof, and is configured to perform welding by the welding torch 4 with the cover portion 11a removed. In addition, nichrome wire heaters 12a, 12b, and 12c are installed around the main body 1 having the flux tabs 2 in the case 11 respectively. In this embodiment, one is provided on each of the short side surfaces of the case 11, one is provided on the bottom surface, and two to four nichrome wire heaters 12a, 12b, 1 are provided on the flat side surface.
2c are installed according to the size of the main body 1 to be welded. Further, a non-contact type temperature sensor 13 capable of detecting the temperature of the main body portion 1 is arranged on the other end side of the upper portion in the case 11. The control device 16 is configured to control the temperature of the material to be welded. The control device 16 is connected to the main power source.

Next, a specific manufacturing method for forming a rotary disc blade using the above manufacturing apparatus will be described. First, the flux tabs 2 and 2 are attached to the periphery of the disk-shaped steel body 1 and are housed in the heat insulating / heat insulating case 11 shown in FIG. Next, the control device 16
ON / OFF control of power supply to each of the nichrome wire heaters 12a, 12b, 12c of the electric furnace 15 is performed based on the preset temperature input in advance, and the temperature change of the main body 1 is performed by using the temperature sensor 13. The temperature management control of the main body 1 is performed by measuring. FIG. 4 shows an example of temperature management control of the main body 1 by the heat treatment apparatus 17. That is, the flux tab 2
In the state where the main body 1 having 2 is installed, the temperature of the main body 1 is about 25 by the nichrome wire heaters 12a to 12c.
Heat to 0 degrees (preheat). And the main body 1
When the temperature of the main body 1 reaches about 250 degrees, the cover 11a of the case 11 is opened and the main body 1 is rotated circumferentially while the main body 1 is rotated in the circumferential direction while maintaining the above temperature.
The outer peripheral portion 1a is subjected to overlay welding by overlay welding (see FIG. 3). With respect to the portion where the welding is completed, the temperature is raised to about 300 degrees by heating the main body 1 again, and this state is maintained for about 1 hour (heat treatment). Then, after this, the temperature is slowly lowered and controlled to return to room temperature (cooling).

After the cooling, the build-up welded main body 1 is taken out from the case 11, the flux tabs 2 and 2 are removed, and a machine is applied to the build-up welded weld metal 5 and the peripheral portion of the main body 1. By processing, for example, a saw blade (blade portion) 7 having a large number of teeth is formed around the periphery as shown in a partially enlarged view of FIG. At this time, the cutting edge portion 8 including the tip end portion 7a of the blade portion 7 is formed by the deposited metal 5, while the bottom portion 7b of the blade portion 7 is machined so as to be formed of the same material as the main body portion 1. ing. Further, after the machining, the rotary disk blade is formed by polishing the blade portion 7.

Now, the material of the main body portion 1 of the rotary disk blade and the material of the weld metal 5 forming the cutting edge portion 8 of the blade portion 7 will be examined. First, the main body 1 is required to have characteristics such as strength as a saw blade material, toughness against repeated bending stress, crack resistance, and good weldability. Therefore, from this viewpoint, alloy tool steel (SKS41) and NiCrMo steel (S
Steel materials such as NCM420, tension 980 N / mm ² or more) and carbon steel for machine structure (S35C, tension 570 N / mm ² or more) are suitable.

On the other hand, as the material of the weld metal 5 forming the cutting edge portion 8 of the blade portion 7 of the rotary disc blade, attention is paid to the temperature of the material to be sawed, and the material having the highest hardness in each temperature region. Is suitable. So from this perspective,
Nickel alloy is used for sawing the material to be sawed in the highest temperature range.
Tool steel is suitable in the temperature range of 600 ° C. or lower, and cobalt alloy is suitable in the temperature range between the temperature ranges. Further, in consideration of good weldability and easy availability, Yujimet 520 is the nickel alloy and Stellite No. 520 is the cobalt alloy. 6 and No. No. 21, and Mo high-speed steel is a suitable material for the tool steel.

When the above nickel alloy is used, the weight ratio of each component is chromium 15.00-2.
It is preferable to contain 0.00%, molybdenum 4.00 to 18.00%, cobalt 15.00% or less, tungsten 1.00 to 5.00%, iron 5.00% or less, titanium 3.00% or less, aluminum 2.00% or less, and the balance nickel and inevitable impurities. Also,
When the above cobalt alloy is used, the weight ratio of each component is as follows: chromium 25.00-30.00%, tungsten 1
It is preferable to contain 2.00% or less, carbon 0.25 to 2.50%, iron 3.00% or less, nickel 2.50% or less, molybdenum 5.00% or less, and balance cobalt and unavoidable impurities. Further, as the weight ratio of each component in the case of using the tool steel, carbon 0.80 to 0.95%, chromium 3.00 to 4.50%, molybdenum 4.50 to 5.50%, tungsten 6.00 to 7.00%, vanadium 1.50 to 2.00%, cobalt 5.00% Contains:
The balance is preferably iron and inevitable impurities.

Next, considering the shape of the cutting edge of the blade portion 7, the width of the cutting edge portion 8 is formed so as to be wider than the width of the main body portion 1 in the thickness direction of the blade portion 7. Is preferred. That is, in the above-described embodiment, as shown in the partially enlarged cross-sectional view of FIG. 6A, it is configured so that both end sides thereof widen from the main body portion 1 toward the tip portion 7a of the blade portion 7. However, in this way, by providing the relief of the angle θ from the tip portion 7a of the blade portion 7 toward the bottom portion 7b, the surface of the rotary disc blade that comes into contact with the material to be sawed at the time of sawing is small. Therefore, a gap can be provided between the main body 1 and the material to be sawed, so that the temperature rise of the main body 1 can be suppressed and the frictional resistance due to the contact with the material to be sawed can be reduced. It is possible to reduce significantly. Further, as shown in FIGS. 6 (b) and (c),
Even if the blade portion 7 is formed by forming a relief on only one of the right end surface or the left end surface of the tip portion 7a and forming staggered teeth by alternately combining these, the same as above. The effect can be obtained. Note that FIG.
As in (d), the main body 1 and the blade 7 may have the same thickness.

As described above, according to the first embodiment,
By applying build-up welding to the outer peripheral portion 1a of the main body 1,
By forming the cutting edge portion 8 of the blade portion 7, it becomes possible to form the main body portion 1 and the cutting edge portion 8 by using different materials in an easy method. It is possible to satisfy both of the required properties, such as toughness, crack resistance, and weldability, and the properties required for the cutting edge portion 8, such as maintaining high hardness in a high temperature region. According to the overlay welding method,
It becomes possible to easily form the rotary disc blade having the blade tip portion 8 having an arbitrary thickness. In addition, the bottom portion 7b of the blade portion 7
Since the toughness and the crack resistance of the blade portion 7 in the vicinity of the bottom portion 7b can be improved by forming the blade from the same material as that of the main body portion 1, the blade portion 7 can be bent during the work. It is possible to suppress the occurrence of defects such as cracks. Further, the rotary disc blade having the nickel alloy is for hot saw cutting, the rotary disc blade having the cobalt alloy is for warm saw cutting, and the rotary disc blade having the tool steel is a cold saw. If the material is selectively used depending on the temperature of the material to be sawed so as to be used for cutting, the above effect becomes more remarkable.

Next, a second embodiment of the rotary disc blade of the present invention will be described with reference to FIGS. 7 (a) to 7 (c). In this embodiment, as in the case of the first embodiment, the flux tabs 2 ...
In the state where 2 is provided, overlay welding is performed on the outer peripheral portion 1a (see FIG. 7 (a)), and both side surfaces of the weld overlay welded metal 5 portion and the peripheral portion of the main body portion 1 are ground. Then, the blade portion 7 is provided to form a round knife (see FIGS. 7B and 7C). Note that the other components of this embodiment are substantially the same as the configurations described in the above embodiments, and therefore description thereof is omitted. As described above, the main body 1 having the blade portion 7 plated by overlay welding can be used not only as a saw material as shown in the above embodiment but also as a material for a circular knife. is there.

Further, a third embodiment of the rotary disc blade of the present invention will be described with reference to FIG. That is, in the above-described first embodiment, the outer peripheral portion 1a of the main body portion 1 is configured to form the cutting edge portion 8 of the blade portion 7 by performing overlay welding, but in this embodiment, the disc The weld metal 5 is built up along the peripheral portions on both side surfaces of the main body 1 to form the blade tip portion 8 of the blade portion 7. Here, FIG. 8 (a)
Is a partially enlarged view of a cutting edge portion 8 of the blade portion 7 formed by the side surface overlaying, and FIG. 8B is a schematic side sectional view of a manufacturing apparatus for performing the side surface overlaying of the rotating disk blade. . Figure 8
In (b), 11 is a substantially rectangular case for heat insulation and heat retention, in which a substantially disk-shaped main body 1 is rotatably housed around its center and the main body 1 A nichrome wire heater 12 is installed in the periphery. The case 11 has an opening 11b at one end of the upper part thereof, so that the weld metal 5 is welded to the peripheral portion of the side surface of the main body 1 from the opening 11b by using a welding torch (not shown). Is configured. At this time, first, after overlay welding the deposited metal 5 on one side surface of the main body portion 1, the main body portion 1 is turned upside down, and the rear surface side surface is similarly subjected to the overlay welding. The welded metal 5 is constructed by overlay welding on the peripheral portions of both side surfaces (FIG. 8).
(See (a)). It should be noted that, since the other components and operational effects of this embodiment are substantially the same as those of the first embodiment, the description thereof will be omitted.

A fourth embodiment of the rotary disc blade of the present invention will be described with reference to FIGS. 9 (a) to 9 (c). That is, in each of the above embodiments, the substantially disk-shaped main body 1
It is configured to form the cutting edge portion 8 of the blade portion 7 by applying build-up welding to the outer peripheral portion 1a or the peripheral portion of the side surface, but in this embodiment, as shown in FIG. 9 (a). Winding a deformed rectangular wire rod 20 having a trapezoidal cross-section on the outer periphery of the main body portion 1, and welding the contact portion between the main body portion 1 and the rectangular wire rod 20 by electron beam welding, laser welding, or a filler metal The main body portion 1 and the rectangular wire rod 20 forming the blade tip portion 8 of the blade portion 7 are joined by the above. Here, FIG. 9 (b) is a partially enlarged view of the cutting edge portion 8 joined by the electron beam welding or laser welding, and FIG. 9 (c) is a cutting edge portion 8 joined by the welding using the filler material. A partially enlarged view is shown. As shown in the drawing, also in this embodiment, the thickness of the cutting edge portion 8 formed by the flat wire 20 is equal to that of the main body portion 1.
Is formed in a taper shape with a larger divergence than the thickness of. As a result, a gap can be provided between the main body 1 and the material to be sawed, so that the temperature rise of the main body 1 at the time of sawing can be suppressed and the friction due to the contact with the material to be sawed can be suppressed. The resistance can be reduced. Further, according to the above method, since it is possible to use different materials for the rectangular wire 20 and the main body portion 1, characteristics required for the main body portion 1, for example, characteristics such as toughness, crack resistance, weldability, and the like,
It is possible to form a rotary disc blade satisfying both the characteristics required for the blade tip portion 8, for example, the characteristics of maintaining high hardness in a high temperature region.

Although specific embodiments of the rotary disc blade of the present invention have been described above, the present invention is not limited to the above-mentioned embodiments, and various modifications can be made within the scope of the present invention. It can be carried out. That is, as shown in each of the above embodiments, the bottom portion 7b of the blade portion 7 is preferably made of the same material as the main body portion 1, but may be made of the same material as the cutting edge portion 8. In addition, as shown in the above embodiment, a method of replacing the blade tip portion 8 of the blade portion 7 with one formed of each of the above-mentioned materials (nickel alloy, cobalt alloy, tool steel) depending on the temperature of the material to be sawed. However, it is also possible to utilize, for example, a rotating disc blade formed of a material that maintains a high temperature in a high temperature region for sawing a material to be sawed at a lower temperature,
Further, the material is not limited to the above.

[0041]

EXAMPLE Here, an example of a rotary disk blade formed based on the manufacturing method shown in the above embodiment will be shown. First, in the material of the main body 1 of the rotating disc blade in this embodiment,
Alloy tool steel (SKS41) for impact resistant tools was used.
Its specific chemical composition is 0.35 carbon by weight.
%, Chrome 1.30%, silicon 0.30%, tungsten 2.00
%, Manganese 0.30% was used. On the other hand, the weld metal 5 that constitutes the cutting edge portion 8 of the rotating disk blade
In consideration of the temperature of the material to be sawed, three types of materials, nickel alloy, cobalt alloy, and high speed steel (tool steel), which will be described in detail below, were selected as the material of (1). Further, the MIG welding method was used for the overlay welding of the outer peripheral portion 1a of the main body 1 in this embodiment. After completion of the welding, post heat treatment was performed at a temperature of 300 ° C. for about 1 hour, and then tooth cutting was performed to form a saw blade (blade portion) around the main body 1.

Next, the polymerization ratios of the specific components of the three kinds of materials used as the materials for the above-mentioned deposited metal 5, nickel alloy, cobalt alloy, and high speed steel, and the above-mentioned deposited metal materials in the main body 1 The welding conditions for overlay welding on the outer periphery will be described. First, the temperature of the nickel alloy is 100
It is preferably used for sawing a material to be sawed at 0 ° C to 850 ° C.
In this example, the composition ratio of the components among the nickel alloys is 0.03% carbon, 20.00% chromium, 4.00% molybdenum, 11.00% cobalt, 1.00 tungsten.
%, Titanium 1.50%, aluminum 0.80%, vanadium 0.
A nickel alloy containing 80% and the balance nickel and inevitable impurities was used. As specific welding conditions, a solid wire having a diameter of 1.2 mm is used as the above-mentioned welding wire, the temperature of the main body 1 is preheated to 250 ° C., the wire feed speed is 4500 mm / min, the welding current is 250 A, and the welding current is 250 A. Overlay welding was performed at a voltage of 25V.

The above cobalt alloy has a temperature of 850 ° C.
It is preferably used for sawing a material to be sawed at up to 600 ° C. Further, in this example, among the above cobalt alloys, a cobalt alloy was used in which the polymerization ratio of the components was 0.80% carbon, 29.00% chromium, 4.68% tungsten, 1.13% iron, and the balance cobalt and unavoidable impurities. In addition, the specific welding condition is that the above welding wire has a diameter of 1.6 mm.
Use the flux-cored wire of
Preheat to 50 ℃ and feed wire at 4000m
Overlay welding was performed at m / min, a welding current of 200 A, and a welding voltage of 20 V.

Further, the high speed steel is preferably used for sawing a material to be sawed at a temperature of 600 ° C. or less. In this example, the polymerization ratio of the components among the above high-speed steels is 0.88% carbon, 4.18% chromium, 5.15% molybdenum, 6.01% tungsten, and 1.83% vanadium, with the balance consisting of iron and unavoidable impurities. Speed steel was used. The specific welding condition is that the above welding wire has a diameter of 1.6.
Using a flux-cored wire of mm, preheat the temperature of the main body 1 to 250 ° C and feed the wire at a speed of 500
The overlay welding was performed at 0 mm / min, a welding current of 300 A, and a welding voltage of 30 V.

Next, FIGS. 10 (a) to 10 (c) show an example of a rotary disc blade which has been subjected to build-up welding using each of the above-mentioned deposited metals 5 and then subjected to gear cutting. Here, FIG. 10A is a schematic plan view of the rotary disc blade, FIG. 10B is a partially enlarged view of the blade portion, and FIG. 10C is a cross-sectional view taken along the line AA of the blade portion. There is. First, as shown in FIGS. 10 (a) and 10 (b), the rotary disc blade has a saw blade for hot working around the main body portion 1, and the shape of the blade portion 7 is that of the blade tip portion 8. It has a substantially equilateral triangle shape with an angle of about 60 °. Also, the main body 1
The shape of the cutting edge portion 8 in the thickness direction of the
Tapered shape that widens toward a (see FIG. 10C)
Are formed on the upper surface, and this portion forms a relief of the angle θ. As a specific numerical example, when the diameter of the rotary disc blade is 1200 mm, the thickness is a = 6 mm, the number of teeth is 200, and the pitch is 18.85 mm, the cutting edge portion 8 formed by the weld metal 5 Is b = 5 mm, the width of the tip end portion 7a in the thickness direction is c = 8 mm, and the height from the tip end portion 7a to the bottom portion 7b of the blade portion 7 is e = 11.3 mm.

Next, an experiment was conducted in which the forged steel pipe (material to be sawed) 21 having a diameter of 114.3 mm and a thickness of 8.6 mm was saw-cut using each of the rotary disc blades formed as described above. . FIG. 11 is a schematic process chart showing the manufacturing process of the forged steel pipe 21, and shows the sawing position of each rotary disc blade used in this experiment and the temperature of the forged steel pipe 21 at each position. First, in FIG. 11, hot forming, forge welding, and drawing are performed to obtain about 100
The forged steel pipe 21 heated to 0 ° C. was sawed by a rotating disc blade A having a nickel alloy blade into a half length.
Next, the forged steel pipe 21, which was sized and cooled to about 820 ° C., was sawed to a length of about half by a rotating disc blade B having a cobalt alloy blade. Finally, an experiment was performed in which both ends of the forged welded steel pipe 21 cooled to about 550 ° C. were sawn using a rotary disc blade C having a high speed steel blade.

As a result of the above experiment, the wear of the cutting edge portion 8 of the rotary disc blades A, B and C formed by using each of the above materials is significantly less than that of the conventional product, and the life thereof is about the same as that of the conventional product. It was revealed that the extension was 5 to 8 times. Also,
During the sawing, no cracks were generated in the main body 1. Further, since the relief is provided in the cutting edge portion 8 of the blade portion 7, the frictional resistance on the side surface of the blade portion 7 is reduced, and as a result, the cutting speed is increased, so that there is also a secondary effect that the cutting time is shortened. Was given.

[0048]

As described above, according to the rotary disc blade of the above-mentioned claim 1, the main body and the cutting edge portion are formed of different materials, so that the characteristics required for the main body, such as toughness and resistance, can be improved. It is possible to satisfy both characteristics such as crackability and weldability, and characteristics required for the cutting edge portion, for example, characteristics such as maintaining high hardness in a high temperature region.

According to the rotating disk blade of the second or third aspect, the main body portion and the blade tip portion can be formed of different materials by an easy method.

According to the rotating disc blade of the fourth aspect, it is possible to suppress the temperature rise of the main body during sawing and reduce the frictional resistance due to the contact with the material to be sawed. Becomes

According to the rotating disk blade of the fifth aspect, since the toughness and crack resistance of the bottom portion 7b can be improved, the bottom portion is cracked or the like due to the bending of the blade portion during the work. It is possible to suppress the occurrence of defects.

According to the rotating disk blade of the sixth aspect, the toughness against repeated bending stress and the crack resistance can be improved, and good weldability can be obtained.

According to the rotating disk blades of the above-mentioned claims 9 to 9, nickel alloy, cobalt alloy, or tool steel is used as the material of the blade edge portion depending on the temperature of the material to be sawed. For example, it is possible to form a blade edge portion that maintains high hardness in each region of high temperature to normal temperature. As a result, the wear generated at the cutting edge portion can be significantly reduced, so that the life of the rotary disc blade can be extended.

According to the method for manufacturing a rotary disc blade of the tenth aspect, it is possible to easily form the rotary disc blade by using a material suitable for each part. Further, by adopting such a build-up welding method, it is possible to freely manufacture a rotary disc blade having a main body portion and a blade portion having different thicknesses, or a blade portion having a special shape.

According to the rotating disk blade of the eleventh aspect, it is possible to suppress the temperature rise of the main body portion at the time of sawing and reduce the frictional resistance due to the contact with the material to be sawed. Becomes

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an entire manufacturing apparatus for a rotary disc blade according to a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing a part of a rotating disc blade welding device in this embodiment.

FIG. 3 is a partially enlarged cross-sectional view of the welding device.

FIG. 4 is a graph showing an example of temperature management control of a rotary disc blade in this embodiment.

FIG. 5 is a partially enlarged view of the rotary disc blade in this embodiment.

FIG. 6 is a schematic cross-sectional view showing the shape of the blade edge portion in the thickness direction of the rotary disc blade in the above embodiment.

FIG. 7 is a schematic configuration diagram for explaining a rotary disc blade according to a second embodiment of the present invention.

8A and 8B are schematic views for explaining a rotary disc blade according to a third embodiment of the present invention, where FIG. 8A is a partially enlarged view of a side surface built-up blade portion, and FIG. 8B is a side surface built-up blade. It is a schematic side sectional drawing of a manufacturing apparatus.

FIG. 9 is a schematic diagram for explaining a rotary disc blade according to a fourth embodiment of the present invention, (a) is a schematic explanatory diagram for explaining a joining method, and (b) and (c) are cutting edge portions. FIG.

FIG. 10 shows a rotating disc blade in an embodiment,
(a) is the schematic plan view, (b) is the elements on larger scale which shows the blade part, (c) is the AA sectional view of the said blade part.

FIG. 11 is a schematic process drawing showing the manufacturing process of the forged steel pipe in the example.

[Explanation of symbols]

1 body 1a outer peripheral part 2 Flux tab 4 welding torch 5 Weld metal 7 blade 7a tip 7b bottom 8 cutting edge 10 Welding equipment 11 cases 15 Electric furnace 16 Control device 17 Heat treatment equipment 20 flat wire

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Nobuo Ushio             4-48 Midoridai, Kawanishi City, Hyogo Prefecture (72) Inventor Matsui Shigetomo             1-2-5 Minamijima Minami-cho, Chuo-ku, Kobe-shi, Hyogo             No. Within the New Industry Creation Research Institute (72) Inventor Yoshiaki Fujiwara             1-2-5 Minamijima Minami-cho, Chuo-ku, Kobe-shi, Hyogo             No. Within the New Industry Creation Research Institute (72) Inventor Keiichi Yamanaka             1-2-5 Minamijima Minami-cho, Chuo-ku, Kobe-shi, Hyogo             No. Within the New Industry Creation Research Institute (72) Inventor Togo Hiki             1-20 Ogigahigashi, Komaki City, Aichi Prefecture             Business (72) Inventor Takaharu Nagata             2-14-17 Yokotsumi, Tsurumi-ku, Osaka City, Osaka Prefecture             Inside Joto Brewery Co., Ltd.

Claims (11)

[Claims] 1. A rotary disc blade having a blade portion (7) on the outer periphery of a disc-shaped body portion (1), wherein the blade tip portion (8) is made of a material different from that of the body portion (1). A rotating disc blade characterized by. 2. The rotary disc blade according to claim 1, wherein at least the cutting edge portion (8) of the blade portion (7) is formed by overlay welding. 3. A rectangular wire (2) forming at least a cutting edge portion (8) of a blade portion (7) on the outer periphery of the main body portion (1).
0) is wound to join the main body (1) and the rectangular wire (20) to each other. 4. The cutting edge portion (8) is configured such that its thickness is greater than the thickness of the main body portion (1). Rotating disc blade. 5. The rotating disk according to claim 1, wherein the bottom portion (7b) of the blade portion (7) is made of the same material as that of the main body portion (1). blade. 6. The rotary disc blade according to claim 1, wherein a steel material is used as a material of the main body portion (1). 7. A nickel alloy is used as a material of the cutting edge portion (8), and the component is a weight ratio of chromium 15.00-2.
It is characterized by containing 0.00%, molybdenum 4.00 to 18.00%, cobalt 15.00% or less, tungsten 1.00 to 5.00%, iron 5.00% or less, titanium 3.00% or less, aluminum 2.00% or less, and the balance nickel and inevitable impurities. The rotating disc blade according to any one of claims 1 to 6. 8. A cobalt alloy is used as a material for the cutting edge portion (8), and the component is a weight ratio of chromium 25.00-3.
0.00%, tungsten 12.00% or less, carbon 0.25 to 2.50
%, Iron 3.00% or less, nickel 2.50% or less, molybdenum 5.
The rotary disc blade according to any one of claims 1 to 6, wherein the rotary disk blade contains 00% or less, and the balance is cobalt and unavoidable impurities. 9. A tool steel is used as a material for the cutting edge portion (8), and its components are 0.80 to 0.95% by weight of carbon, 3.00 to 4.50% of chromium, 4.50 to 5.50% of molybdenum, and 6.00 to 7.00% of tungsten. The rotary disc blade according to any one of claims 1 to 6, containing 1.50 to 2.00% vanadium and 5.00% or less cobalt, and the balance iron and unavoidable impurities. 10. Flux tabs (2, 2) are arranged on both end faces of a peripheral portion of a disk-shaped main body (1), and while the main body (1) is rotated, the flux tabs (2, 2) are formed.
A welding wire is inserted between and in the vicinity of 2) and the outer periphery of the main body part (1) is welded by overlay welding by melting the welding wire, and then the tooth part is cut to form the blade part (7). A method for manufacturing a rotary disc blade, which is configured to be formed. 11. The rotary disc blade according to claim 10, wherein a thickness of a cutting edge portion (8) of the blade portion (7) is formed to be larger than a thickness of the main body portion (1). Manufacturing method.