JP4482722B2 - Glass fiber cutting blade and cutting apparatus comprising the same - Google Patents

Description

  The present invention relates to a glass fiber cutting blade used in a manufacturing process of a glass fiber product and a cutting apparatus having the same.

  Glass fiber products are used in all fields of industry, but are generally manufactured by the following procedure. First, various glass raw materials are weighed, mixed and adjusted so as to have a predetermined target composition when they become glass fibers in advance, and glass cullet and additives are added as appropriate to obtain a glass raw material batch. This glass raw material batch is put into a glass melting furnace heated to a high temperature by a raw material charging machine, homogenized, etc., and then pulled out from a number of platinum bushing nozzles in a glass melting furnace molding tank. Spinning to become glass monofilaments by cooling with water spray etc., and then coating the glass monofilament surface with various agents such as bundling agent, bundling up to thousands of glass monofilaments to form strands, for example turret type Using a winding device such as a winder, a paper tube or wood tube mounted on a bobbin is wound around a semi-finished product called cake or cheese and used in various processes.

  Although a glass long fiber product such as glass roving or glass yarn can be produced from the cake or cheese thus produced, a glass chopped strand will be described here as one of common cases. The glass chopped strand is manufactured by continuously unwinding and aligning the strands from the cake or cheese described above, and then cutting the strands into desired dimensions using various cutting devices such as a roving cutter. The chopped strands are supplied to a dispersing device and appropriately 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. It is also used as an aggregate (also referred to as filler, additive, reinforcing material, etc.) for constituting various composite materials.

As described above, a cutting blade mounted on a cutting device used for obtaining a glass chopped strand having high performance from a strand is one of basic members or tools that determine the processing quality of the glass chopped strand. For this reason, in order to improve the performance of the cutting blade, various inventions have so far been made on glass fiber cutting blades. 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. Moreover, in patent document 3, a blade | wing part is prescribed | regulated by prescribing | regulating the ratio of the blade part length dimension of the fiber cutting blade comprised by joining through the joining layer 3 of the base part 2 and the base | substrate part 2 to a base part length dimension to a predetermined value. An invention has been disclosed that can prevent damage to the image. 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. And in patent document 5, the Vickers hardness of the blade part 1 is further improved to 2000 or more, and in patent document 6, the invention of the base part 2 that facilitates joining with the blade part 1 having high hardness is disclosed. .
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 to provide a glass fiber cutting blade having higher performance. This cutting blade is manufactured by welding and joining two members, the base part and the blade part. However, depending on the manufacturing lot, there is a problem that the welding yield decreases to about 40%, and the cause of this problem is investigated. In the process, the laser light output conditions during welding have been changed to cope with, and the distortion that occurs at the cutting edge and bottom of the cutting blade due to residual distortion that occurs during welding has been eliminated by polishing. However, this method alone cannot solve a permanent problem. In addition, since the distortion of the cutting blade during welding may reach 0.35 mm with respect to the long overall length (300 mm) of the blade, a large amount of labor is required for polishing performed to eliminate the distortion. It has become a thing. As the distortion of the cutting blade increases, there is also a problem of shortening the service life of the glass fiber, that is, shortening the service life of the cutting blade. It has become.

  Therefore, the present invention provides a glass fiber cutting blade that can be used for cutting glass fibers, suppresses welding distortion at the time of manufacturing the cutting blade, and realizes a stable cutting quality, It is an object of the present invention to provide a glass fiber cutting device provided with the glass fiber cutting blade.

Glass fiber cutting blade of the present invention is a disconnect blade that consists from the blade portion and the base portion for cutting the glass fiber, the material of the blade portion is a cemented carbide containing tungsten carbide (WC), the average particle diameter according to the following equation 1 relationship of tungsten carbide (D) is, Ri near the range of 0.25μm to 0.85 .mu.m, the magnitude of the distortion in the longitudinal direction of the cutting blade, the length per 300mm It is 0.07 mm or less .

Here, a fiber cutting blade composed of blade portion and the base portion for cutting the glass fiber, the material of the blade portion is a cemented carbide containing tungsten carbide (WC), the number of the above-mentioned tungsten carbide 1 an average particle diameter according to the equation (D) is, Ri near the range of 0.25μm to 0.85 .mu.m, the magnitude of the distortion in the longitudinal direction of the cutting blade, is not more than the length 300mm per 0.07mm Is a cutting blade for glass fiber cutting by cutting glass fiber into a glass product such as a glass chopped strand, and the cutting blade is constituted by a blade portion constituting the cutting blade and a base portion fixing the blade portion. Tungsten carbide represented by the above-described relational expression 1 as a constituent material of the blade portion, that is, a fullman formula (chemical element notation WC and Represented), i.e. the average particle size of the tungsten carbide (D) is, Ri near the range of 0.25μm to 0.85 .mu.m, the magnitude of the distortion in the longitudinal direction of the cutting blade, length 300mm per 0. 07mm represents the following der Rukoto.

  As a material of the blade part of the present invention, any material-containing component other than tungsten carbide has a predetermined hardness and strength and does not suppress cutting performance low, regardless of what is contained. If necessary, an appropriate amount may be contained. Further, as long as the performance and function do not deteriorate, the purity of tungsten carbide does not matter. Specifically, WC-Co, WC-TaC-Co, WC-TiC-Co, and WC-TiC-TaC-Co cemented carbides can be used.

As a method for average particle diameter according to equation number 1 of Fullman tungsten carbide (WC) constituting the blade portion (D) is, to make sure that from 0.25μm in the range of 0.85 .mu.m, the following Follow the procedure.

  The structure cross section of the blade portion is polished so as to be in a clean state, and observation is performed with 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 at 1000 times, but when the particles are fine and it is difficult to obtain a detailed image of details, the tissue photograph is taken up to 5000 times. Next, use appropriate image analysis software etc. within the specified rectangular area of the tissue photograph taken, or draw a plurality of vertical and horizontal line segments that are divided equally by human power, and within the predetermined rectangular total area The number of tungsten carbide particles and the number of tungsten carbide particles on the line segment are measured. Here, the measurement is continued until the number of particles reaches at least 10,000. Therefore, if the number of tungsten carbide particles is less than 10,000 in one structure photograph, the structure photograph of another part is taken and the same operation is repeated for a plurality of structure photographs to obtain tungsten carbide particles. The number should be 10,000 or more. Using the measured values obtained in this way, the average number of tungsten carbide particles is calculated according to the relational expression 1 described above. This relational expression 1 can be expressed in detail as the following Fullman's expression (relational expression 2) below, so that it can be specifically calculated from actual measurement values. Follow this formula.

With respect to the average particle diameter of tungsten carbide constituting the blade portion, the base particle portion and the blade portion are welded by setting the average particle diameter according to the above-described formula 2 Fullman formula within the range of 0.25 μm to 0.85 μm. In doing so, the ratio of occurrence of cracking or breakage of the welded part immediately after welding is small, and the distortion generated during welding is also preferable because the magnitude thereof is reduced. If the average particle diameter of tungsten carbide constituting the blade portion is less than 0.25 μm, the desired thermal performance may not be realized, which is not preferable. On the other hand, when the average particle diameter of tungsten carbide constituting the blade portion exceeds 0.85 μm, there may be a problem in weldability, which is not preferable. This fact has been found by a welding confirmation test by a test piece conducted by the present inventors, and by limiting the average particle diameter of tungsten carbide represented by the Fullman equation of Formula 2 within a predetermined range, This is because it has been found that weldability such as welding distortion of the blade portion can be remarkably improved with good reproducibility. In addition to this aspect, the glass fiber cutting blade of the present invention, the life of the cutting blade, i.e. in order to prolong the life, the material of the blade portion, tungsten carbide above the number 1 of the (WC) The average particle diameter (D) according to the relational expression 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 magnetic field strength in the opposite direction required to bring the magnetization to 0 becomes larger as the tungsten carbide particle size becomes smaller. Therefore, by using this property, if the magnetic field strength value used as a reference and the tungsten carbide particle size at that time are determined in advance by a measurement method using a microscope, the subsequent measurement will be performed using a time-consuming microscope. Even without adopting the measurement method, the measurement of the average particle diameter of tungsten carbide can be substituted by the measurement of the magnetic field strength value. Employing such an alternative method is preferable because it enables measurement at a higher speed, which can greatly improve working efficiency.

  Moreover, the cutting blade for glass fibers of the present invention has any appearance form as long as it has a function of efficiently cutting glass fibers by applying a sufficiently high shearing force to the glass fibers. Also good. 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.

In the glass fiber cutting blade of the present invention, a welding diffusion portion formed by heating a welding material having a thickness in a range of 0.05 mm to 0.6 mm used during welding is provided between the blade portion and the base portion. It is characterized by that. In addition to the above, the glass fiber cutting blade of the present invention can securely fix the blade portion and maintain a stable cutting ability if the base portion supporting the blade portion is made of carbon tool steel. preferable.

  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), such as thermal expansion coefficient, hardness, elastic constant, etc. The carbon tool steel can be used as long as the carbon tool steel has suitable properties and has a performance suitable for interposing between the blade portion and the constituent member of the cutting device that can be used with the cutting blade fixed. 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 in a range of 0.5 mass% to 1.6 mass%. Carbon tool steel.

  The blade portion of the glass fiber cutting blade according to the present invention can be manufactured by applying a known manufacturing technique. For example, tungsten carbide fine particles containing a predetermined amount of cobalt as a binder are heated and sintered. Specifically, 88.5% by mass of tungsten carbide powder having an average particle size of 0.45 μm and 11.5% by mass of cobalt particles are homogeneously blended, and HIP (Hot Isostatics Press) is used. By molding, it can be made into a predetermined shape, and the alloy thus obtained has a Vickers hardness of Hv1800 or higher.

  The blade part and the base part may be fixed by any method that enables sufficiently high joining. 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.

  In addition to the above, the glass fiber cutting blade of the present invention can form a desired long glass fiber product as long as it is used for cutting long glass fibers. It is preferable because it can be cut.

  Here, to be used for cutting long glass fibers means that a glass fiber formed by continuously drawing molten glass heated in a glass melting furnace from a bushing having a plurality of platinum nozzles is formed by shearing force. It shows that it has the function to cut | disconnect.

  As long as it is a long glass fiber, it can be applied in any form such as roving, yarn, or chopped strand. It goes without saying that glass fiber products originating from these fiber forms are also products that are the subject of the present invention. That is, for example, the present invention can be applied to forming a glass fiber mat, braid, net, tape or the like.

  Moreover, about the glass long fiber as mentioned above, it is not limited about the kind of processing agents, such as a sizing agent which coat | covers the surface.

  Furthermore, if the cutting blade for glass fibers of this invention is used for manufacture of a glass chopped strand in addition to the above, it will replace the glass chopped strand which has a high dimensional accuracy and a well-equipped cutting surface over a long period of time. It is preferable because it can be used without performing maintenance work.

  If it is a glass chopped strand, the diameter of the glass fiber is not limited. 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.

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

Here, the glass fiber cutting blade described in any one of the above is a fiber cutting blade composed of a blade portion for cutting glass fiber and a base portion, and the material of the blade portion is tungsten carbide (WC). a cemented carbide containing, average particle diameter according to the relationship of the above-mentioned Fullman tungsten carbide (D) is, be those from 0.25μm in the range of 0.85 .mu.m, further cutting edge portion in addition The supporting base portion may be made of carbon tool steel, and further has a glass fiber cutting blade that may be used for cutting long glass fibers. Represents.

  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. Moreover, a plurality of incidental facilities for efficient cutting 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.

  In addition to the above, the glass fiber cutting device of the present invention continuously cuts glass fiber as long as it has a structure in which the base portion of the glass fiber cutting blade is arranged on the coaxial cylindrical surface. This 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 in which the cutting blades are disposed. The product such as the glass chopped strand generated by the above can be moved out of the system 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) Glass fiber cutting blade above the present invention provides a disconnect blade that consists from the blade portion and the base portion for cutting the glass fiber, the material of the blade section of tungsten carbide the (WC) comprising a cemented carbide, the average particle diameter according to the aforementioned equation 1 relationship of motor ring stent carbide (D) is, Ri near the range of 0.25μm to 0.85 .mu.m, the distortion in the longitudinal direction of the cutting blade Since the size is 0.07 mm or less per 300 mm length, the amount of distortion generated during welding can be suppressed, and the weldability of the blade can be remarkably improved. You can extend the time.

  (2) Moreover, if the base | substrate part which supports the said blade part consists of carbon tool steel, the cutting blade for glass fibers of this invention will be fixed to a blade part by the external force added to a cutting blade by fixing a blade part reliably. It is possible to prevent an excessive load from being applied, and to easily predict the quality over time when the cutting blade is continuously used.

  (3) Furthermore, if the cutting blade for glass fibers of the present invention is used for cutting long glass fibers, it can realize a cutting operation without impairing the performance of various glass products, such as defects caused by the cutting site. Stable quality glass fiber products can be manufactured.

  (4) Moreover, if the cutting blade for glass fibers of this invention is used for manufacture of a glass chopped strand, it can suppress the cutting defect which generate | occur | produces in the cutting process of a glass chopped strand, and follows design dimensions and design quality. Glass chopped strands can be produced.

  (5) Since the glass fiber cutting device of the present invention comprises the above-described glass fiber cutting blade, it is possible to produce glass fiber products with a low defect occurrence rate. The trouble due to the malfunction caused by the cutting blade generated during use of the cutting apparatus can be minimized.

  (6) Furthermore, if 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 coaxial cylindrical surface, various glass long fiber products are efficiently produced. Therefore, the processing cost of the glass product can be reduced.

  Below, the fiber cutting blade of this invention and the glass fiber cutting device which uses the fiber cutting blade are demonstrated based on an Example.

FIG. 1 shows one of specific examples of the glass fiber cutting blade of the present invention. The cutting blade 10 shown here is composed of a blade portion 10a and a base portion 10b, and the fixing of both is performed by welding. Therefore, the cutting blade 10 is used between the blade portion 10a and the base portion 10b during welding. There is a weld diffusion part 10c generated by heating the welded material, and the weld diffusion part 10c firmly bonds the blade part 10a and the base part 10b. About the blade part 10a of the cutting blade 10, the dimension of each part is 0.4 mm to 0.8 mm in thickness dimension, 0.5 mm to 14.5 mm in width dimension, and the tip shape is a straight grind of a 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 84 mass%, and is made of a WC-Co type cemented carbide.

  When the microstructure of the alloy of the blade portion 10a is observed using an appropriate apparatus such as a microscope capable of observing at a magnification of 1000 times or more, the structure shown in the conceptual diagram in FIG. 2 can be confirmed. it can. As is clear from this figure, tungsten carbide has a fine structure and is distributed as a particle M in the cobalt phase P. Therefore, in order to calculate the average particle diameter of the tungsten carbide particles M, the electron microscope image of 5000 times is taken, and the binarization processing and tungsten carbide particles are performed by the image analysis software on the rectangular area from the obtained structure photograph. The numbering process of M is performed to virtually draw a vertical line segment and a horizontal line segment that are divided so as to equally divide the rectangular area, and then the tungsten carbide particles M within the entire rectangular area The number and the number of tungsten carbide particles M on the imaginary line segment are measured, the measurement is repeated so that the numbering number of the particles M is 10,000 or more, and the accuracy is improved. When calculated, the value is 0.45 μm to 0.50 μm, which is suitable as a blade portion mounted on the glass fiber cutting blade of the present invention. there were.

  The measured value of the average particle size of tungsten carbide can be measured simply by measuring the magnetic field strength in the opposite direction required to bring the magnetization to 0 when the cemented carbide is fully magnetized as described above. It is also possible to perform. In the case of the present invention, the measured value of the magnetic field strength was 13 to 30 (kA / m).

  Further, regarding the blade portion 10a of the glass fiber cutting blade 10 of FIG. 1, when the hardness of the material is measured by using a Vickers hardness tester, the value is Hv. It was in the range of 1600-2000.

  The base portion 10b of the glass fiber cutting blade 10 has a thickness of 0.3 to 12 mm, a width of 5 to 25 mm, and the material has a carbon (C) content of 1.0. This is a carbon tool steel in the range of mass% to 1.4 mass%.

  Next, a procedure for producing the glass fiber cutting blade 10 will be described below.

  The cutting edge 10 for glass fiber of the present invention first comprises 84% by mass of a suitable tungsten carbide of tungsten carbide (WC) having a particle size in the range of 0.35 μm to 0.55 μm, and 16 mass of cobalt powder. The base material of the plate-shaped blade portion 10a made of a cemented carbide is formed by mixing homogeneously so as to prevent segregation or the like and performing heat forming with HIP.

  On the other hand, it is adjusted by repeating quenching and tempering processes, and a plate-shaped carbon tool steel having a carbon (C) content of 1.2 mass% is processed to match the shape of the cutting blade 10. Thus, the base portion 10b of the cutting blade 10 is produced.

Next, the metal material foil for joining was put in contact with the gap between the end face of the blade part 10a and the end face of the base part 10b so that the thickness dimension would be an appropriate dimension in the range of 0.05 mm to 0.6 mm. The state is held, and laser irradiation is performed in the vicinity of the tip of the base portion 10b. When the carbon tool steel, which is the base material, is heated to a high temperature state by this irradiation, the joining metal material foil that comes into contact with the end face of the base portion 10b is heated to a molten state. Further, the cemented carbide containing tungsten carbide in the blade portion is also integrally heated by heat conduction from the molten metal material foil, and the blade portion 10a, the metal material foil, and the base portion 10b are integrated. Thus, the diffusion bonding portion 10c is formed. At this time, iron in the carbon tool steel is diffused in the diffusion bonding portion 10c. The metal material foil also melts into the cemented carbide and is joined at the diffusion joint 10c. The linear thermal expansion coefficient of the alloy layer of this bonding material is in the range of 41 × 10 ^{−7 to} 45 × 10 ⁻⁷ / K in the temperature range of 30 to 300 ° C., and the linear thermal expansion coefficient ( In the temperature range of 25 to 200 ° C., it approximates 45 × 10 ⁻⁷ / K), so that the thermal stress remaining at the joint between the blade member and the base is relaxed to a small value, and the joint is out of design. The blade portion 10a and the base portion 10b are firmly joined without causing any deformation. 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, and the yield rate was 98.5%, confirming that the welding quality was greatly improved compared to the prior art.

  In addition, as shown in FIG. 3, the strain amount L in the longitudinal direction of the cutting blade 10 was measured for the amount of strain generated in the glass fiber cutting blade 10 produced in such a procedure. Although the amount of strain may be as much as 0.30 mm per long full length (300 mm), for the glass fiber cutting blade 10 of the present invention, the measured value of the strain amount L for 10 specimens. Is 0.05 mm or less, and it has been found that it can be improved to a remarkably small value.

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

  Here, as an example of the glass fiber cutting device of the present invention, a cutting device for forming a glass chopped strand will be described with reference to the conceptual diagram shown in FIG. In this apparatus 100, a plurality of glass fiber cutting blades 10 of the present invention 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. It is. The apparatus 10 further includes a cutter roll 20 that is rotatable about a rotation axis, and a rubber roll 30 for supplying the glass strand G to the cutting edge of the cutting blade 10 of the cutter roll 20. . And the rotation speed of the cutter roll 20 and the rubber roll 30 is a specification which can each be adjusted arbitrarily.

  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 as for the average particle diameter of tungsten carbide, a photograph is taken using a microscope in the same manner as described above, and it is 0.60 to 0.80 μm when calculated from the image by applying the formula 2 to the Fullman equation. The cutting blade for glass fiber 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.

  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 Diffusion joining part 20 Cutter roll 30 Rubber roll 100 Cutting device G Glass strand M Tungsten carbide particle P Co phase L Strain dimension

Claims (7)

A disconnect blade that consists from the blade portion and the base portion for cutting the glass fiber,
The material of the blade part is a cemented carbide containing tungsten carbide (WC),
The average particle diameter according to the following equation 1 relationship of motor ring stent carbide (D) is, Ri near the range of 0.25μm to 0.85 .mu.m,
The cutting blade for glass fibers , wherein the magnitude of distortion in the longitudinal direction of the cutting blade is 0.07 mm or less per 300 mm length .
The weld diffusion part produced by heating the welding material in the range of thickness 0.05mm to 0.6mm used at the time of welding exists between a blade part and a base part. Cutting blade for glass fiber. The glass fiber cutting blade according to claim 1 or 2 , wherein the base portion for supporting the blade portion is made of carbon tool steel. Glass fiber cutting blade according to claims 1 to claim 3, characterized in that it is subjected to the cutting of the long glass fibers. It is used for manufacture of a glass chopped strand, The cutting blade for glass fibers in any one of Claims 1-4 characterized by the above-mentioned. A glass fiber cutting device comprising the glass fiber cutting blade according to any one of claims 1 to 5 . The glass fiber cutting device according to claim 6 , having a structure in which a base portion of a glass fiber cutting blade is disposed on a coaxial cylindrical surface.