JP4529185B2 - Glass fiber cutting blade, manufacturing method thereof and cutting apparatus - Google Patents

Description

  The present invention relates to a glass fiber cutting blade used in a manufacturing process of a glass fiber product, a method for manufacturing the cutting blade, and a glass fiber cutting device including the glass fiber cutting blade.

  Glass fiber products are used in various fields, and the general manufacturing procedure is as follows. Various glass raw materials are weighed and mixed, and glass cullet and additives are added as appropriate to adjust the glass composition to a predetermined target composition when it becomes glass fiber in advance. Next, this glass raw material batch is put into a glass melting furnace heated to a high temperature using a raw material charging machine such as a charger, and after a series of operations such as homogenization by clarification and stirring, in the glass melting furnace forming zone. Pulled out from a platinum bushing having a number of nozzles, cooled with water spray or the like, and spun into a glass monofilament. Then, various chemicals such as bundling agents are coated on the surface of the glass monofilament, and hundreds to thousands of bundling agents are bundled to form a strand, and this strand is used, for example, a filament winding device such as a turret type winder. Then, it is continuously wound around a paper tube or wood tube mounted on a bobbin to form a semi-finished product called a cake or cheese, and this semi-finished product is used in various processes.

  Although glass long fiber products, such as glass roving and glass yarn, can also be manufactured from the cake or cheese formed in this way, glass chopped strand is further demonstrated as one example here. Glass chopped strands are manufactured by continuously unwinding and aligning glass strands from the cake or cheese described above, and then continuously cutting them into desired dimensions using various cutting devices such as roving cutters. Has been. The chopped strands thus obtained are supplied to a dispersing device and dispersed and deposited to be processed into a predetermined form such as a chopped strand mat, paper, or tape, or an organic material, a cement material, etc. and FRTP, FRP, GRC, etc. It is also used as an aggregate (also referred to as filler, additive, reinforcing material, etc.) for constituting the various composite materials.

As described above, various types of cutting devices are used to produce excellent quality glass chopped strands from glass strands. The glass fiber cutting blade mounted on this apparatus is a basic member that determines the processing quality of the glass chopped strand, and is an important tool. Accordingly, various inventions have been made so far in order to improve the performance of a cutting blade for cutting glass fibers. For example, Patent Document 1 discloses a device in which the material of the rubber roll is a composite material in order to increase the strength of the rubber roll pressed by the cutting blade. Further, in Patent Document 2, as shown in FIG. 5, by limiting the ratio of Vickers hardness with respect to the blade portion 1 and the base portion 2, the invention reduces the wear of the blade and can be used for a long time. Yes. Further, in Patent Document 3, the ratio between the length of the fiber cutting blade and the length of the base portion of the fiber cutting blade configured by joining the blade portion 1 and the base portion 2 via the bonding layer 3 is defined as a predetermined value. An invention that can prevent the blade from being damaged is disclosed. Further, Patent Document 4 discloses an invention about a structure that relieves residual strain due to welding of the blade portion 1 and the base portion 2. Patent Document 5 discloses an invention relating to the base part 2 that further improves the Vickers hardness of the blade part 1 to 2000 or more, and Patent Document 6 makes it easy to join the blade part 1 having high hardness. Yes.
Japanese Utility Model Publication No. 05-96033 JP 2002-355788 A JP 2002-361590 A JP 2002-370192 A JP 2003-53693 A JP 2003-266370 A

  However, the inventions made so far are not sufficient for stable production of high-quality glass fiber products. The cutting blade used for cutting the glass fiber is manufactured by welding and joining two members, a base member and a blade member, and the welding yield is remarkably different depending on the manufacturing lot of the cutting blade. There is a problem of lowering. As a coping solution to this problem, it is possible to change the laser light output conditions at the time of welding, or to eliminate distortion generated at the cutting edge and bottom of the cutting blade due to residual distortion generated during welding by polishing. Although it has been done, it has been difficult to solve a permanent problem only by such a method. The size of the distortion generated in the cutting blade during welding may reach 0.30 mm with respect to the long overall length (300 mm) of the blade, and polishing performed to eliminate the generated distortion. It also takes effort in the processing process. Regarding the distortion of the cutting blade, when the magnitude of the distortion increases, there is also a problem of shortening the life of the cutting blade used for cutting the glass fiber, that is, shortening the service life of the cutting blade, reducing the manufacturing cost, In order to obtain glass fibers of stable quality, it is important to suppress the distortion of the cutting blade.

  Therefore, the present invention is mounted on a cutting device used for cutting glass fibers, and as a glass fiber cutting blade, suppresses welding distortion at the time of manufacturing the cutting blade and realizes stable cutting quality over a long period of time. An object of the present invention is to provide a glass fiber cutting blade, a manufacturing method thereof, and a glass fiber cutting device including the glass fiber cutting blade.

Glass fiber cutting blade of the present invention includes a blade portion for cutting the glass fiber, a disconnect blade that having a a base portion for supporting the cutting edge portion, the blade portion and / or the base part, A nickel-containing part is formed adjacent to these joints, and the nickel-containing part contains tungsten carbide (WC) particles having an average particle diameter of 0.20 to 0.85 μm. The size of the strain in the longitudinal direction is 0.07 mm or less per long full length (300 mm) .

Here, a blade portion for cutting the glass fiber, a disconnect blade that having a a base portion for supporting the cutting edge portion, the blade portion and / or the base portion is adjacent to these joints The nickel-containing portion is formed, the nickel-containing portion contains tungsten carbide (WC) particles having an average particle diameter of 0.20 to 0.85 μm, and the magnitude of strain in the longitudinal direction of the cutting blade Is 0.07 mm or less per long full length (300 mm) , a cutting blade for cutting glass fibers used when cutting glass fibers with appropriate dimensions to obtain glass fiber products of a predetermined length The cutting blade is constituted by the blade portion constituting the cutting blade and the blade portion, and the base portion disposed in the cutting device, and the nickel content in at least one constituent material of the blade portion or the base portion is included. The average particle size in the part .. Tungsten carbide (WC) particles in the range of 20 μm to 0.85 μm are contained, and the magnitude of strain in the longitudinal direction of the cutting blade is 0.07 mm or less per long full length (300 mm) I mean.

  Regarding the nickel-containing part, nickel (represented by the element symbol Ni) is a part having a concentration of at least 0.01% by mass percentage, and other components other than nickel have predetermined performance. If it has, it will not specifically limit. Moreover, the nickel contained may be in a state where its state is dissolved with other components such as a metal, that is, in a solid solution state, or may be in a crystallized state.

  Any tungsten carbide (WC) particles may be used as long as the tungsten carbide has a content of more than 50% by mass percentage. Further, the shape of the particles is not particularly limited.

  Regarding the average particle diameter of tungsten carbide (WC) particles, tungsten carbide (represented by WC in chemical element notation) represented by the following relational expression, that is, the fullman formula, that is, tungsten carbide The average particle size (D) is in the range of 0.20 μm to 0.85 μm.

  Further, the blade portion constituting the glass fiber cutting blade of the present invention may be anything, provided that it has a predetermined hardness and strength and does not suppress cutting performance low. Often. The purity is not limited as long as the performance and function are not deteriorated. Specifically, WC-Co, WC-TaC-Co, WC-TiC-Co, and WC-TiC-TaC-Co cemented carbides can be used.

  The base portion constituting the glass fiber cutting blade of the present invention is also particularly limited as long as the blade portion can be firmly fixed and can be easily fixed with a cutting device. There is no limitation on purity and dimensions.

  As a method for confirming that the average particle diameter (D) of tungsten carbide (WC) existing in the nickel-containing portion is in the range of 0.20 μm to 0.85 μm according to the Fulman's formula of Equation 1, the following is performed. Follow a simple procedure.

  First, the blade portion is polished so that the cross section of the tissue is in a clean state, and observation is performed in an enlarged field of view from 1000 times to 5000 times using an enlargement device such as an optical microscope or an electron microscope. . Usually, there is no problem even if the magnification is 1000 times. However, when the tungsten carbide particles are fine and it is difficult to obtain a detailed image of details, the magnification is further increased to 5000 times to obtain a cross-sectional structure. Take a photo. Next, use a suitable image analysis software etc. within the specified rectangular area of the taken tissue photograph, or draw an arbitrary number of vertical and horizontal lines that are divided into equal parts by human power, and the predetermined rectangular total area The number of tungsten carbide particles inside and the number of tungsten carbide particles on the line segment are measured. Here, with respect to the number of tungsten carbide particles, the measurement is continued until the number of particles is at least 10,000. In addition, when the number of particles of tungsten carbide is less than 10000 in one structure photograph, a structure photograph of another part is taken and the same operation is repeated for a plurality of structure photographs. The number of particles should be 10,000 or more. Using the measured values thus obtained, the average number of tungsten carbide particles is calculated according to the relational expression 1 described above. The equation (1) can be expressed in detail by the Fullman's equation shown in the following equation (2) in order to calculate more specifically from actual measurement values.

  If the average particle diameter of tungsten carbide is less than 0.20 μm, the effect of sufficiently reducing the welding strain is small, and it may not be possible to achieve desired durability performance for a long period of use. On the other hand, when the average particle diameter of tungsten carbide exceeds 0.85 μm, there may be a problem in weldability, which is not preferable. In the present invention, as the average particle diameter of tungsten carbide, the base part and the blade part are welded by setting the average particle diameter according to the above-described formula 2 Fullman's formula within the range of 0.20 μm to 0.85 μm. At this time, the ratio of occurrence of cracking or breakage of the welded portion immediately after welding is small, and the distortion generated during welding is also preferable because the magnitude thereof is reduced. This fact is that, in the welding confirmation test by the test piece conducted by the present inventors, if the average particle diameter of tungsten carbide represented by the Fullman equation of Formula 2 is limited to a predetermined range, the welding distortion of the blade portion, etc. This is because the weldability has been remarkably improved with good reproducibility. In addition to such a point of view, the cutting blade for glass fiber of the present invention is made of tungsten carbide according to the relational expression of Equation 1 described above in order to extend the useful life of the cutting blade, that is, the life. The average particle diameter (D) of (WC) is preferably in the range of 0.30 μm to 0.80 μm, and more preferably in the range of 0.35 μm to 0.55 μm.

  Moreover, as a measuring method of the average particle diameter of the tungsten carbide concerning the cutting blade for glass fibers of this invention, you may use together the various methods which supplement the measuring method using the microscope mentioned above. For example, in the case of a cemented carbide containing Co, when the alloy is maximally magnetized, the value of the magnetic field strength in the opposite direction required to bring the magnetization to 0 increases as the grain size of tungsten carbide decreases. Using this property, measure the multiple magnetic field strength values used as a reference and the tungsten carbide particle size at that time with a microscope, and determine the calibration relationship in advance. The measurement of the average particle diameter of tungsten carbide can be substituted for the measurement of the magnetic field strength value without requiring a measurement method. Employing such a substitute method is preferable because it enables higher-speed measurement, which can greatly improve the efficiency of inspection work when manufacturing a glass fiber cutting blade.

  Further, the glass fiber cutting blade of the present invention having the above-mentioned configuration has any appearance as long as it can efficiently cut by applying a sufficiently high shearing force to the glass fiber. May be. For example, as for the shape of the blade portion, the cross-sectional shape of the blade portion may be a single blade shape having a tapered portion inclined only on one side of the blade edge, or a double-edged blade having tapered portions on both sides (also referred to as two blades). May be. In addition, a straight grind and a clam-shaped convex grind with a curved section in the tapered part of the blade edge of the blade, and a curved surface inwardly opposite to the convex grind. Even inside and outside R shapes (or also referred to as hollow grinds) that have a narrowed appearance can be used for cutting glass fibers. Further, the inclination angle of the tapered portion can be adopted as long as it can realize a predetermined cutting function.

  As for the fixing of the blade part and the base part, sufficiently high joining is possible if the blade part and / or the base part is formed with a nickel-containing part adjacent to the joint part. Any method can be used. That is, a method such as welding is preferable, but a welding method, material, tool, and the like at that time can also be selected as appropriate. For example, welding may be direct welding or joining via a low melting point metal foil or the like.

  Further, the glass fiber cutting blade of the present invention, in addition to the above, if the nickel-containing portion is a nickel diffusion layer formed by the diffusion of nickel by welding the blade portion and the base portion using a nickel brazing material, Since the blade portion and the base portion are firmly fixed by welding, the cutting blade can be used for a long time.

  The nickel-containing portion is a diffusion layer formed by the diffusion of nickel by welding between the blade portion using the nickel brazing material and the base portion. When welding the blade portion and the base portion, the blade portion and By diffusing nickel from the nickel foil into at least one of the members of both the blade portion and the base portion by heating the joint surface of the base portion with, for example, a metallic nickel foil. The blade portion and the base portion are joined, and the nickel diffusion layer is formed on at least one of the respective members from the interface between the blade portion and the base portion after joining. .

  Here, the thickness and purity of the nickel foil are not particularly limited, and the size and the like of the formed nickel diffusion layer are not particularly limited.

  Further, the glass fiber cutting blade of the present invention, in addition to the above, if the blade portion is made of cemented carbide and the base portion supporting the blade portion is carbon tool steel, the blade portion is securely fixed, It is preferable because stable cutting ability can be maintained.

  The blade portion of the glass fiber cutting blade of the present invention is preferably made of cemented carbide that can be manufactured by applying a known manufacturing technique. For example, it is obtained by heating and sintering tungsten carbide fine particles containing a predetermined amount of cobalt as a binder. Specifically, tungsten carbide powder having an average particle size of 0.45 μm and 88.5% by mass is obtained. By uniformly blending 5% by mass of cobalt particles and forming by HIP (Hot Isostatics Press), it can be formed into a predetermined shape. The alloy thus obtained has a Vickers hardness of Hv1800 or more.

  Further, the base portion of the blade that supports the blade portion is formed by a quenching and tempering process, and is a steel material containing an appropriate amount of carbon (C), and has a thermal expansion coefficient, hardness, elasticity. Various properties such as constants are appropriate, and it is possible to use carbon tool steel having performance suitable for interposing between the blade part and the component of the cutting device that can be used with the cutting blade fixed. it can. In particular, when importance is attached to the bonding with the blade portion, the material of the base portion is more preferably a carbon content in a mass percentage display, within a range of 0.5 mass% to 1.6 mass%. Carbon tool steel.

  Moreover, if the glass fiber cutting blade of this invention is used for the process of cut | disconnecting a glass long fiber to a glass chopped strand in addition to the above, the glass chopped strand which has a high dimensional accuracy and a well-equipped cutting surface for a long time. This is preferable because it can be used without performing maintenance work such as replacement of the cutting blade.

  In the present invention, the diameter of the glass fiber is not limited as long as it is a glass chopped strand. The material of the glass fiber is not particularly limited. For example, the glass fiber material is an alkali-free E glass material substantially free of alkali metal elements, a D glass material having a low dielectric constant, an AR glass material capable of realizing alkali resistance, and acid resistance. C glass material, M glass material realizing high elastic modulus, S glass material realizing high strength and high elastic modulus, T glass material having the same function as S glass, H glass material having higher dielectric constant, etc. Various glass materials can be employed as appropriate, and glass materials other than those described above that are designed to realize an optimum function may be used.

  Moreover, in this invention, about the glass chopped strand as mentioned above, it does not limit also about the kind of processing agents, such as a sizing agent which coat | covers the surface.

The manufacturing method of the glass fiber cutting blade of the present invention uses a nickel brazing material to connect the blade portion and the base portion to a . The glass fiber cutting blade according to any one of the above is manufactured by having a step of pressure welding with a pressure stress in a range of 5 kg / m ^{2 to} 50 kg / m ² .

The glass fiber according to any of the above by having a step of pressure bonding with pressure stress in the range of 0.5kg ^/ m ² ~50kg / m 2 and a blade portion and the base portion using a nickel brazing filler metals and producing a use cutting blade, a disconnected blade that consists from the blade portion and the base portion for cutting the glass fiber, the pressure stress magnitude ranging from 0.5kg ^/ m ² ~50kg / m 2 A cutting blade in which the nickel-containing portion of the blade portion and / or the base portion contains tungsten carbide (WC) particles having an average particle diameter of 0.20 to 0.85 μm is manufactured by heat welding while being pressure-welded. Preferably, the nickel-containing portion forms a nickel diffusion layer by diffusing nickel by welding the blade portion and the base portion, and more preferably, the blade portion is made of cemented carbide and the blade portion is Supporting substrate But a carbon tool steel, is that the production of glass fiber cutting blade suitable for use in manufacturing by continuous cutting operation the glass chopped strands having a predetermined size from the long glass fibers.

Here, in the manufacturing method of the glass fiber cutting blade of the present invention, the magnitude of the stress to be pressed needs to be 0.1 kg / m ² or more, and if the pressure is weak, the nickel is sufficiently diffused. Since it does not progress, it is not preferable. In addition, if the magnitude of the stress to be pressed is too strong, there is a risk that the weld shape may become uneven, and the magnitude of the stress to be pressed from such a viewpoint is 0.5 kg / m ^{2 to} 50 kg / and more preferably in a range of m ^2.

  As a manufacturing procedure of the cutting blade for glass fiber, in accordance with the procedure as described above, an appropriate material member made of cemented carbide, carbon tool steel, etc. is prepared in advance on the blade portion and the base portion, respectively, and the shape is adjusted, and the joining surface Make sure that is clean. Next, as described above, for example, with the nickel foil held between the joining surfaces, laser irradiation is performed while pressing with a predetermined pressure, and the nickel foil is heated to weld the blade portion and the base portion. .

  The glass fiber cutting device of the present invention comprises the glass fiber cutting blade described in any of the above.

  Here, the glass fiber cutting device comprising the glass fiber cutting blade described above has a nickel-containing portion adjacent to the joint portion in the blade portion and / or the base portion as described above. This means a glass fiber cutting device having a structure in which a cutting blade is provided in which the nickel-containing portion contains tungsten carbide (WC) particles having an average particle diameter of 0.20 to 0.85 μm.

  The cutting apparatus for glass fibers of the present invention is not particularly limited with respect to the number of cutting blades used and the arrangement state. Further, in order to efficiently perform the cutting, other process facilities, that is, a plurality of incidental facilities can be used in combination. For example, a device for unwinding glass fibers for cutting, a device for imparting or untwisting twists, a device for transporting glass fibers after cutting, a device for applying a surface treatment agent, and the like There are devices for monitoring the prepared cutting and various control devices for adjusting the cutting speed.

  Moreover, if the glass fiber cutting device of this invention has the structure formed by arranging the base | substrate part of the cutting blade for glass fibers on the surface of a coaxial cylindrical body in addition to the above, it will cut | disconnect continuous glass fiber efficiently. Since it can be performed, it is preferable.

  In this way, by forming the base portion of the glass fiber cutting blade on the coaxial cylindrical surface, for example, a structure in which the cutting blades are arranged radially at the coaxial cylindrical surface position around the roll-shaped roller. A predetermined number of cutting blades can be arranged at equal intervals, and the glass strand is wound between two opposing rolls so that an appropriate shearing force is applied to a predetermined portion of the continuously supplied glass strand. And can be cut into glass chopped strands having a predetermined length. Specifically, the two opposing rolls may be configured as a cutter roll provided with a rubber roll and a cutting blade. About the material and its dimension of the rubber roll which press-contacts a cutter roll, it can select suitably and can arrange | position with what is preferable about heat resistance and mechanical durability. The cutter roll can also be employed as long as it has a structure that has sufficiently high strength that is practically stable.

  In addition, as a rubber roll pressed against the cutter roll, the strength of the rubber roll is to be practically used, so that glass fibers, carbon fibers, glass flakes, organic fibers, glass beads, ceramic fibers and ceramic particles are included in the rubber roll as necessary. At least one reinforcing filler selected from the group can be contained.

  Moreover, in the glass fiber cutting device of this invention, when each cutting blade is arrange | positioned at a short distance mutually, for example, 3 mm space | interval, the cutting blades may be worn over time, etc., and may be damaged or destroyed. Therefore, the cutting blade can be provided by arranging auxiliary parts such as a cushioning material such as rubber (e.g., thickness 0.2 mm to 0.5 mm) or a metal spacer on both sides of the cutting blade so that the cutting blade can be reinforced. It becomes difficult to break, and the durability of the cutting device can be improved.

  Further, the glass fiber cutting device of the present invention has a mechanism for continuously collecting the glass fibers after being cut to the lower side or the side of the cutting mechanism provided with the cutting blade. The produced product such as glass chopped strand can be moved out of the cutting mechanism so as not to hinder the cutting operation. As such a thing, the continuous conveyance by a belt conveyor, the conveyance duct by an airflow, etc. can be employ | adopted, for example, the required number of things required by the scale of equipment etc. can be employ | adopted suitably.

  Further, regarding the supply mechanism for supplying the strand to the glass fiber cutting device of the present invention, the strand cutting mechanism may also serve as the supply mechanism. In addition to the strand cutting mechanism, the strand supply device is appropriately connected to this device. It may be arranged appropriately.

(1) The cutting blade for glass fiber of the present invention is a fiber cutting blade having a blade portion for cutting glass fiber and a base portion for supporting the blade portion, wherein the blade portion and / or the base portion is The nickel-containing part is formed adjacent to these joints, and the nickel-containing part contains tungsten carbide (WC) particles having an average particle diameter of 0.20 to 0.85 μm. Since the magnitude of the distortion in the longitudinal direction is 0.07 mm or less per long full length (300 mm) , the weldability between the blade part and the base part can be improved, and distortion is difficult to occur and high strength It can be set as the cutting blade which has.

  (2) Further, in the cutting blade for glass fiber of the present invention, if the nickel-containing part is a nickel diffusion layer formed by welding the blade part using the nickel brazing material and the base part, the blade part and the base part Therefore, stable cutting performance can be realized even in long-time machining operations.

  (3) Further, in the glass fiber cutting blade of the present invention, if the blade portion is made of cemented carbide and the base portion supporting the blade portion is carbon tool steel, the blade portion is securely fixed to the base portion. In addition, since the base part has the performance that it is easy to arrange in the cutting device etc., it is possible to prevent an excessive load from being applied to the blade part due to external stress applied to the cutting blade, and when using the cutting blade continuously It is possible to easily predict the quality over time.

  (4) Moreover, if the cutting blade for glass fibers of this invention is provided to the process of cut | disconnecting a glass long fiber into a glass chopped strand, mixing of the fiber from which the cutting length which generate | occur | produces at the cutting process of a glass chopped strand will differ. It is possible to suppress the occurrence of inappropriate problems such as contamination of foreign materials during cutting and abnormal cutting surfaces, and it is easy to manufacture glass chopped strands according to design dimensions and design quality.

(5) A method of manufacturing a glass fiber cutting blade of the present invention comprises the steps of pressure bonding with pressure stress in the range of 0.5kg ^{/ m 2} ~50kg ^/ m 2 and a blade portion and the base portion using a nickel brazing filler metals Since the cutting blade for glass fiber described in any of the above is manufactured by having a high bonding strength can be realized through nickel and can withstand a load applied during cutting for a long time. The cutting blade can be easily configured.

  (6) Since the glass fiber cutting device of the present invention includes the glass fiber cutting blade described above, it is possible to continuously produce glass fiber products with a low defect occurrence rate. Therefore, it is possible to minimize the occurrence frequency of trouble related to the malfunction or cutting of the apparatus due to the cutting blade generated during use of the cutting apparatus.

  (7) Since the glass fiber cutting device of the present invention has a structure in which the base portion of the glass fiber cutting blade is arranged on the surface of the coaxial cylindrical body, various glass long fibers having excellent performance. The product can be produced with high efficiency, and the processing cost of the glass fiber product can be suppressed.

  [Examples] The fiber cutting blade of the present invention, the method for producing the same, and the glass fiber cutting device provided with the fiber cutting blade will be described in detail below based on examples.

  1A and 1B show one specific example of the glass fiber cutting blade of the present invention. 1A is a plan view, and FIG. 1B shows the structure of the XX cross section in FIG. 1A.

  The cutting blade 10 shown in FIG. 1 is composed of a blade portion 10a and a base portion 10b, and both of them are fixed by welding by heating. Therefore, the cutting blade 10 is interposed between the blade portion 10a and the base portion 10b. Has nickel diffusion layers 10c and 10d formed by heating the nickel foil used at the time of welding, and these nickel diffusion layers 10c and 10d are firmly bonded to the blade portion 10a and the base portion 10b through the nickel layer 10e. is doing. About the blade part 10a of the cutting blade 10, the dimension of each part is 0.4 mm to 0.8 mm in the thickness dimension, 0.5 mm to 14.5 mm in the width dimension, and the tip shape thereof is a straight grind of the two-edged blade. It is what you make. About the material of the blade part 10a of the cutting blade 10, cobalt (Co) is 16 mass% and tungsten carbide (WC) is a WC-Co type cemented carbide alloy of 84 mass%.

  When the microstructure of the alloy of the blade portion 10a of the cutting blade 10 is observed and investigated using an appropriate apparatus such as a microscope capable of observing at a magnification of 1000 times or more, the portion of the blade portion where nickel is diffused is shown in FIG. It can be confirmed that it has a structure conceptually represented in FIG. As can be seen from this figure, tungsten carbide (WC) has a fine structure in the portion of the blade portion where nickel has diffused, and is distributed in the nickel diffusion phase P as particles M. ing. Further, in order to calculate the average particle diameter of the tungsten carbide particles M in the portion where the nickel in the blade portion has diffused, the electron microscope image of 5000 times is taken, and an image of the inside of the rectangular area is obtained from the obtained tissue photograph. Binarization processing and numbering processing of tungsten carbide particles M are performed by analysis software, and vertical virtual line segments and horizontal virtual line segments that are divided so as to be equally divided within the rectangular area are drawn. Then, the number of tungsten carbide particles M virtually formed in the rectangular area and the number of tungsten carbide particles M on the imaginary line segment are measured so that the numbering number of particles M is 10,000 or more. The measurement accuracy is improved by repeating the measurement, and the tungsten carbide (WC) is calculated by the above-described Fullman equation of Equation 2. The value of the average particle diameter D is a 0.50μm from 0.45 [mu] m, was preferred as the blade section used in the glass fiber cutting blade of the present invention.

  Further, regarding the blade portion 10a of the glass fiber cutting blade 10 of FIG. 1, when the Vickers hardness meter is used to measure the hardness of the material, the value is Hv. It was found to be in the range of 1600-2000.

  The base portion 10b of the glass fiber cutting blade 10 has a thickness dimension of 0.2 to 14 mm, a width dimension of 3 mm to 27 mm, and a carbon (C) content rate of 1.0. This is a carbon tool steel in the range of mass% to 1.4 mass%.

  When the same operation as described above is performed on the portion where nickel is diffused in the base portion, and the average particle diameter of the tungsten carbide particles M is calculated by the Fullman equation of Formula 2, the value D is from 0.52 μm to 0.2 mm. It was found to be 59 μm, and the base portion was also suitable for use in the glass fiber cutting blade of the present invention.

  Subsequently, the manufacturing method of this glass fiber cutting blade 10 is demonstrated in order below.

  The cutting edge 10 for glass fiber of the present invention is a tungsten carbide (WC) having a particle diameter in the range of 0.35 μm to 0.55 μm, and suitable tungsten carbide is equivalent to 84% by mass and cobalt powder is 16%. The base material of the plate-shaped blade portion 10a made of cemented carbide is formed by measuring the amount corresponding to the mass% and mixing homogeneously so as not to cause segregation and high-pressure heat forming with HIP.

  On the other hand, regarding the base portion, a plate-shaped carbon tool steel adjusted to have a carbon (C) content of 1.2 mass% by repeating quenching and tempering treatment separately from the manufacture of the blade portion. The base portion 10b of the cutting blade 10 is manufactured by processing so as to match the shape of the cutting blade 10.

Next, from the nickel for bonding prepared in advance so that the thickness dimension is an appropriate dimension within the range of 0.05 mm to 0.6 mm in the clean gap between the end face of the blade part 10a and the end face of the base part 10b. A metallic material foil is sandwiched between the carbon tool steel as the base material and the cemented carbide as the blade as abutting each other, and brought into pressure contact with a pressure of 0.1 kg / m ² or more. Laser irradiation is performed near the tip of the portion 10b. When the carbon tool steel, which is the base material, is heated to a high temperature state by this irradiation, the metallic material foil 10d made of nickel for joining contacting the end face of the base portion 10b by heat conduction is heated to a molten state. Further, the metal material foil 10d made of nickel in a molten state contains the tungsten carbide of the blade portion 10a by heat conduction, but is integrally heated, and the metal material foil made of the blade portion 10a and nickel, and the base portion As a result, the nickel diffuses from the nickel foil to both sides of the cemented carbide side and the carbon tool steel side to form the nickel diffusion layers 10c and 10d.

The linear diffusion coefficient of the nickel diffusion layers 10c and 10d formed by the nickel diffusion is in the range of 42 × 10 ^{−7 to} 46 × 10 ⁻⁷ / K in the temperature range of 30 to 300 ° C. Since the linear thermal expansion coefficient of the portion 10a is approximated (45 × 10 ⁻⁷ / K in a temperature range of 25 to 200 ° C.), the thermal stress remaining at the joint portion between the blade member and the base portion becomes a small value, The blade portion 10a and the base portion 10b are firmly joined without causing undeformable distortion deformation at the joint. And the sharp blade part 10a is formed by performing a cutting process etc. on the front-end | tip of the blade part 10a, and the cutting blade 10 is obtained.

  Next, in order to investigate the weldability of the glass fiber cutting blade 10 manufactured as described above, a weld specimen was prepared for the above-described metal material, and the welded surface after welding was evaluated by visual observation. On the surface portion of the part, defects such as cracks and cracks were generally good, the yield rate was 98.5%, and the weld quality was greatly improved as compared with the conventional case.

  Further, regarding the magnitude of distortion at the time of welding that occurs in the glass fiber cutting blade 10 manufactured by the series of steps as described above, as shown in FIG. 3, the strain magnitude L in the longitudinal direction of the cutting blade 10 is shown. In the past, the magnitude of the distortion of the cutting blade was sometimes 0.30 mm per long full length (300 mm), but for the glass fiber cutting blade 10 of the present invention. When measuring 10 specimens, the measured value of L, which is the magnitude of the distortion, is 0.05 mm or less, and the cutting blade can be improved to a very small value. There was found.

  Next, a glass fiber cutting device constructed using this cutting blade 10 will be described below.

  Here, as one example of the glass fiber cutting device of the present invention, a cutting device for obtaining glass chopped strands by cutting glass strands into desired dimensions is shown in accordance with the explanatory diagram conceptually shown in FIG. explain. In this cutting apparatus 100, a plurality of glass fiber cutting blades 10 of the present invention prepared and prepared in advance are arranged radially around the cutter roll 20 at equal intervals. Specifically, the cutting blade 10 is disposed by adjusting and fixing the base portion 10b of the glass fiber cutting blade 10 on the coaxial cylindrical surface of the cutter roll 20 so as to be radially spaced at equal intervals. Yes. Moreover, in this apparatus 10, the cutter roll 20 which can rotate centering on a rotating shaft, and the rubber roll 30 for supplying the glass strand G to the blade edge | tip of the cutting blade 10 of this cutter roll 20 are provided. . The rotational speeds of the cutter roll 20 and the rubber roll 30 can be arbitrarily adjusted.

  Using this glass cutting device 100, the continuous roll of glass having E glass composition was continuously cut into a glass chopped strand having a length of 3 mm by operating the cutter roll 20 at a rotational speed of 450 m / min. However, there was no noticeable change in the cutting ability even after 100 hours had passed, and it was confirmed that a good cutting function for a long time, which was difficult with a conventional cutting blade, was maintained.

  A case where the material of the blade portion 10a of the glass fiber cutting blade 10 is changed with the same configuration as that of the first embodiment will be described below.

  The material of the blade portion 10a of the cutting blade 10 is a cemented carbide made of 10% by mass of cobalt (Co) and 90% by mass of tungsten carbide (WC). And about the average particle diameter of the tungsten carbide in the nickel diffusion part formed by diffusing from the metal material foil made of nickel for bonding, a photograph was taken using a microscope as described above, and from the image It is 0.60 to 0.80 [mu] m when calculated by applying to the Fullman equation of Equation 2, which is a cutting blade for glass fiber that satisfies the requirements of the present invention.

  The cutting blade 10 was subjected to a welding test to the same carbon tool steel as in Example 1 in the same procedure as in Example 1. As a result, defective products due to the welding work itself occurred, but the non-defective rate was 95%. The result showed a high number. Further, when the value of the distortion amount L of the blade edge was measured in the same manner as in Example 1, the value was 0.07 mm or less per 10 samples in the longitudinal direction (300 mm) in the longitudinal direction. I was able to confirm that it was in a small state.

[Comparative Example] As a comparative example of the present invention, a tungsten carbide having an average particle number of 0.11 μm constituting the blade portion (Comparative Example 1) was used, and an average of tungsten carbide similarly constituting the blade portion. What used the thing (comparative example 2) whose particle diameter is 0.93 micrometer was created with the manufacturing process similar to Example 1 about each other point.

  About Comparative example 1 and Comparative example 2, it investigated about the distortion amount and welding property at the time of welding. First, when Comparative Example 1 and Comparative Example 2 were examined for distortion magnitude L value during welding, the distortion magnitude L value of the cutting blade was 0.25 mm per long full length (300 mm). Was also observed, and improvement was difficult to recognize.

  Moreover, when Comparative Example 1 and Comparative Example 2 were evaluated for weldability in the same manner as in Example, no noticeable defect was observed for Comparative Example 1, but for Comparative Example 2, welding was performed. There were some cases in which fine cracks and cracks were observed in some places, and 8 samples out of 20 samples prepared as test pieces were in a state where problems occurred during use, and the yield rate was 60%.

  As described above, the glass fiber cutting blade of the present invention exhibits extremely small weld distortion values that can realize stable cutting quality over a long period of time, and various types of glass fiber cutting devices equipped with the cutting blade are available. It has become clear that it has an optimum performance for cutting glass fibers used in applications and is important in producing excellent glass fiber products.

The fragmentary sectional view of the cutting blade for glass fibers of this invention, (A) is a top view, (B) represents the figure of the XX cross section of (A). About the cutting blade for glass fibers of this invention, the conceptual diagram of the fine structure of the blade part is represented. Explanatory drawing about the measurement location of the distortion value of a cutting blade is represented. The principal part explanatory drawing about the glass fiber cutting device of this invention is represented. It is explanatory drawing of the conventional cutting blade for glass fiber, Comprising: (A) is a top view, (B) represents the figure of the YY cross section of (A).

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Glass fiber cutting blade 1, 10a Blade part 2, 10b Base part 10c, 10d Nickel diffusion layer 10e Nickel layer 20 Cutter roll 30 Rubber roll 100 Cutting device G Glass strand M Tungsten carbide (WC) particle P Nickel diffusion phase L Distortion Size

Claims (7)

A cutting blade having a blade portion for cutting glass fiber and a base portion for supporting the blade portion,
The blade portion and / or the base portion is formed with a nickel-containing portion adjacent to the joint portion, and tungsten carbide having an average particle diameter of 0.20 to 0.85 μm in the nickel-containing portion ( WC) particles,
The cutting blade for glass fibers, wherein the size of distortion in the longitudinal direction of the cutting blade is 0.07 mm or less per long full length (300 mm) .
The cutting blade for glass fibers according to claim 1, wherein the nickel-containing portion is a nickel diffusion layer formed by welding a blade portion using a nickel brazing material and a base portion. The said blade part is a product made from a cemented carbide alloy, and the base | substrate part which supports a blade part is carbon tool steel, The cutting blade for glass fibers of Claim 1 or Claim 2 characterized by the above-mentioned. The cutting blade for glass fibers according to any one of claims 1 to 3, wherein the cutting blade is used for a step of cutting long glass fibers into glass chopped strands. According to claims 1 to claim 4 by comprising a step of pressure bonding with pressure stress in the range of 0.5kg ^/ m ² ~50kg / m 2 and a blade portion and the base portion using a nickel brazing filler metals The manufacturing method of the cutting blade for glass fibers characterized by manufacturing the cutting blade for glass fibers of this. A glass fiber cutting device comprising the glass fiber cutting blade according to any one of claims 1 to 4. The glass fiber cutting device according to claim 6, wherein the glass fiber cutting device has a structure in which a base portion of a glass fiber cutting blade is disposed on a surface of a coaxial cylindrical body.

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