JP2012036310A - Molding resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a molding resin composition that produces a tool holder having high mechanical strength, heat rigidity and impact strength and a tool holder having high water resistance and moisture resistance and excellent dimensional stability.SOLUTION: The molding resin composition 17 is produced by mixing a liquid phenol resin (thermosetting synthetic resin), a glass fiber (inorganic fiber) and the whole cotton fiber or the whole cotton cloth (natural fiber material) with a resin-impregnated fiber material impregnated with a liquid phenol resin. In the resin-impregnated fiber material, the amount of the phenol resin impregnated based on 100 wt.% of the cotton fiber or cotton cloth is 20-40 wt.%. In the molding resin composition 17, the content of the glass fiber based on 100 wt.% of the phenol resin is 5-15 wt.% and the content of the resin impregnated fiber material based on 100 wt.% of the phenol resin is 100-150 wt.%.

Description

  The present invention relates to a molding resin composition mainly composed of a thermosetting synthetic resin, and more specifically, molding used as a molding material for a tool holder of a tool used for processing using a water-soluble cutting oil. The present invention relates to a resin composition.

  A pair of grips made by molding a reinforced synthetic resin, a detection pin embedded in the rear end of one of the grips, and a positioning key and an elastic member disposed between the grips These grips are installed on the support plate so that they can operate on the fulcrum shaft, and grip positioning pins are provided on the grip operation surface with the fulcrum shaft as the base point to prevent the grip from moving in the same direction. There is a tool holder gripping device that detects the position of a pin and confirms gripping of the tool holder (see Patent Document 1). As a reinforced synthetic resin for making a grip, a thermosetting synthetic resin reinforced with cotton cloth or carbon fiber is used.

Japanese Patent Application No. 3-245939

  In machine tools such as a vertical machining center and a horizontal machining center, a plurality of types of cutting tools for cutting are used. These cutting tools are held in the tool holder of the tool magazine when they are not used. By the way, at the time of cutting, water-soluble cutting oil is used to reduce the frictional heat generated at that time, but when the cutting tool is stored in the tool holder with the water-soluble cutting oil attached, Water-soluble cutting oil adheres to the tool holder.

  In the tool holder gripping device disclosed in Patent Document 1, since the grip is made of a thermosetting synthetic resin reinforced with cotton cloth or carbon fiber, the cutting tool to which water-soluble cutting oil is attached is used as the grip. When held, the moisture of the water-soluble cutting oil penetrates into the grip through the cotton cloth. When moisture permeates into the grip, the grip swells and its dimensions change, and the strength of the grip may decrease.

  The object of the present invention is to be able to produce a molded product having high mechanical strength, thermal rigidity and impact resistance, and to be able to produce a molded product having high water resistance and moisture resistance and excellent dimensional stability. Another object is to provide a resin composition.

  The resin composition for molding according to the present invention for solving the above problems is obtained by mixing a thermosetting synthetic resin, an inorganic fiber, and a resin-impregnated fiber material in which the entire natural fiber material is impregnated with a thermosetting synthetic resin. The weight ratio of the inorganic fiber to 100% by weight of the thermosetting resin is 5 to 15% by weight, and the weight ratio of the resin-impregnated fiber material to 100% by weight of the thermosetting resin is 100 to 150% by weight. It is in.

  As an example of the molding resin composition of the present invention, in the resin-impregnated fiber material, the weight ratio of the thermosetting synthetic resin to 100% by weight of the natural fiber material is in the range of 10 to 40% by weight.

  As another example of the molding resin composition of the present invention, in the resin-impregnated fiber material, the thermosetting synthetic resin is converted into a natural fiber material in a state where the viscosity is reduced by adding an organic solvent to the thermosetting synthetic resin. By impregnating, the entire natural fiber is coated with the thermosetting synthetic resin.

  As another example of the molding resin composition of the present invention, the natural fiber material has at least one of a cloth shape and a thread shape, and the vertical and horizontal dimensions of the cloth-like natural fiber material are 0.5 × 0.5. It is in the range of ˜20 × 20 mm, and the length of the filamentous natural fiber material is in the range of 0.1 to 10 mm.

  As another example of the molding resin composition of the present invention, the length dimension of the inorganic fiber is in the range of 1 to 20 mm, and the filament diameter of the inorganic fiber is in the range of 6 to 13 μm.

  As another example of the molding resin composition of the present invention, the thermosetting synthetic resin is a phenol-based resin, the natural fiber material is at least one of cotton yarn and cotton cloth, and the inorganic fiber is glass fiber.

  As another example of the molding resin composition of the present invention, the molding resin composition is used as a molding material for a tool holder of a tool used for processing using a water-soluble cutting oil. The dimensional change rate of the tool holder molded by use is in the range of 0.1 to 0.2%.

  As another example of the molding resin composition of the present invention, the bending strength of the tool holder molded using the molding resin composition is in the range of 100 to 130 MPa, and the molding resin composition is used. The bending elastic modulus of the tool holder molded in this manner is in the range of 11000-12500 MPa.

  According to the molding resin composition according to the present invention, it is a mixture obtained by kneading a thermosetting synthetic resin, an inorganic fiber, and a resin-impregnated fiber material obtained by impregnating the entire natural fiber material with a thermosetting synthetic resin, It has excellent self-lubricating properties and can easily make a molded product from a molding resin composition. In this molding resin composition, the weight ratio of the inorganic fibers to 100% by weight of the thermosetting resin is in the range of 5 to 15% by weight, and the weight ratio of the resin-impregnated fiber material to 100% by weight of the thermosetting resin is 100 to 100%. Since it is in the range of 150% by weight, compared to the case where the molded product is made only from thermosetting synthetic resin, it can give toughness and elasticity to the molded product made from it, and it can be used mechanically Molded products with high strength, thermal rigidity and impact resistance can be made. This molding resin composition was made from the thermosetting synthetic resin impregnated in the whole natural fiber material, so that the thermosetting synthetic resin did not penetrate into the natural fiber as a barrier. The molded product has high water resistance and moisture resistance, and even if moisture adheres to the molded product, the moisture does not penetrate into the molded product, and a molded product having excellent dimensional stability can be made.

  In the resin-impregnated fiber material, the molding resin composition in which the weight ratio of the thermosetting synthetic resin to 100% by weight of the natural fiber material is in the range of 10 to 40% by weight is sufficient for the thermosetting synthetic resin in the entire natural fiber material. The natural fibers of the resin-impregnated fiber material can be impregnated and the compatibility of the natural fiber material with the thermosetting synthetic resin is improved, and when the thermosetting synthetic resin, the inorganic fiber and the resin-impregnated fiber material are kneaded, Can be mixed evenly into the thermosetting synthetic resin. The resin composition for molding uses natural fibers and inorganic fibers reliably mixed with the thermosetting synthetic resin. Compared to the case where the molded product is made only from the thermosetting synthetic resin, the molded product made from it. Can be reliably imparted with toughness and elasticity, and can be used to make a molded article having high mechanical strength, thermal rigidity, and impact resistance. In this molding resin composition, the thermosetting synthetic resin is impregnated in the entire natural fiber material, and the entire natural fiber is coated with the thermosetting synthetic resin. It does not penetrate into the fiber, and the molded product made from it has high water resistance and moisture resistance, and even if moisture adheres to the molded product, the moisture does not penetrate into the molded product and has excellent dimensions. A molded product having stability can be produced.

  A resin composition for molding in which a natural fiber material is impregnated with a thermosetting synthetic resin in a state in which an organic solvent is added to the thermosetting synthetic resin to reduce the viscosity of the thermosetting synthetic resin has a reduced viscosity. By impregnating the natural fiber material, the entire natural fiber material can be sufficiently impregnated with the thermosetting synthetic resin, the compatibility of the natural fiber material with the thermosetting synthetic resin is improved, and the thermosetting synthetic resin is improved. When the inorganic fiber and the resin-impregnated fiber material are kneaded, the natural fiber of the resin-impregnated fiber material can be evenly mixed with the thermosetting synthetic resin. The resin composition for molding uses natural fibers and inorganic fibers reliably mixed with the thermosetting synthetic resin. Compared to the case where the molded product is made only from the thermosetting synthetic resin, the molded product made from it. Can be reliably imparted with toughness and elasticity, and can be used to make a molded article having high mechanical strength, thermal rigidity, and impact resistance. In this molding resin composition, the thermosetting synthetic resin is impregnated in the entire natural fiber material, and the entire natural fiber is coated with the thermosetting synthetic resin. It does not penetrate into the fiber, and the molded product made from it has high water resistance and moisture resistance, and even if moisture adheres to the molded product, the moisture does not penetrate into the molded product and has excellent dimensions. A molded product having stability can be produced.

  The natural fiber material has at least one of a cloth shape and a thread shape, the length and width of the cloth-like natural fiber material are in the range of 0.5 × 0.5 to 20 × 20 mm, and the length of the thread-like natural fiber material The molding resin composition having a size in the range of 0.1 to 10 mm is sufficiently impregnated with the thermosetting synthetic resin in the natural fiber material because each dimension of the cloth-like or thread-like natural fiber material is in the above range. The compatibility of the natural fiber material with the thermosetting synthetic resin is improved, and when the thermosetting synthetic resin, the inorganic fiber, and the resin-impregnated fiber material are kneaded, the natural fiber of the resin-impregnated fiber material is heated. It can be mixed evenly into the curable synthetic resin. The resin composition for molding uses natural fibers and inorganic fibers reliably mixed with the thermosetting synthetic resin. Compared to the case where the molded product is made only from the thermosetting synthetic resin, the molded product made from it. Can be reliably imparted with toughness and elasticity, and can be used to make a molded article having high mechanical strength, thermal rigidity, and impact resistance. In this molding resin composition, the thermosetting synthetic resin is impregnated in the entire natural fiber material, and the entire natural fiber is coated with the thermosetting synthetic resin. It does not penetrate into the fiber, and the molded product made from it has high water resistance and moisture resistance, and even if moisture adheres to the molded product, the moisture does not penetrate into the molded product and has excellent dimensions. A molded product having stability can be produced.

  The molding resin composition in which the length dimension of the inorganic fiber is in the range of 1 to 20 mm and the filament diameter of the inorganic fiber is in the range of 6 to 13 μm is the thermosetting synthetic resin because each dimension of the inorganic fiber is in the above range. When inorganic fiber and resin-impregnated fiber material are kneaded, inorganic fiber can be evenly mixed with thermosetting synthetic resin and used to make molded products with excellent mechanical strength and thermal rigidity be able to.

  The molding resin composition in which the thermosetting synthetic resin is phenol resin, the natural fiber material is at least one of cotton yarn and cotton cloth, and the inorganic fiber is glass fiber ensures toughness and elasticity in the molded product made from it. And can be used to make a molded article having high mechanical strength, thermal rigidity and impact resistance. In this molding resin composition, phenolic resin is impregnated on the entire cotton yarn or the entire cotton cloth, and the entire natural fiber is coated with the thermosetting synthetic resin. It does not penetrate, and the molded product made from it has high water resistance and moisture resistance. Even if moisture adheres to the molded product, the moisture does not penetrate into the molded product and has excellent dimensional stability. It is possible to make a molded product having

  Resin composition for molding which is used as a molding material for a tool holder of a tool used for processing using water-soluble cutting oil, and the dimensional change rate of the molded tool holder is in the range of 0.1 to 0.2%. The tool holder made from it has excellent water resistance and moisture resistance, and even if the water of water-soluble cutting oil adheres to the tool holder, the moisture does not penetrate into the tool holder and the dimensions of the tool holder Change can be prevented. Since this molding resin composition has a dimensional change rate of the tool holder made from the above range, the tool holder has excellent dimensional stability, and supports the tool accurately and reliably through the tool holder. be able to.

  A molding resin composition in which the bending strength of a tool holder molded using the molding resin composition is in the range of 100 to 130 MPa and the bending elastic modulus of the tool holder is in the range of 11000 to 12500 MPa was made from the molding resin composition. Since the bending strength and bending elastic modulus of the tool holder are within the above ranges, the tool holder has excellent mechanical strength and impact resistance, and even if an impact is applied to the tool holder, the tool holder will not be damaged or broken. The tool can be accurately and reliably supported via the tool holder.

The perspective view of the tool holder shown as an example. FIG. 2 is an end view taken along line 2-2 in FIG. 1. The perspective view of the tool holder shown as another example. FIG. 4 is an end view taken along line 4-4 of FIG. 3. The figure which shows an example of the resin composition for shaping | molding used in order to make a holder. The figure which shows the test piece used for the measurement of a dimensional change rate. The figure which shows the test piece of a bending test. The figure which shows a bending test method. The figure explaining an example of a 1st kneading | mixing process. The figure explaining an example of the drying process which continues from the 1st kneading process of FIG. 9, and an example of the 1st cooling process which continues from a drying process. The figure explaining an example of the 2nd kneading | mixing process following the 1st cooling process of FIG. The figure explaining an example of the 2nd cooling process continued from the 2nd kneading | mixing process of FIG.

  The details of the molding resin composition according to the present invention will be described with reference to the accompanying drawings such as FIG. 1 which is a perspective view of a tool holder 10A shown as an example. 2 is an end view taken along line 2-2 of FIG. 1, and FIG. 3 is a perspective view of a tool holder 10B shown as another example. 4 is an end view taken along line 4-4 of FIG. In FIG. 1, the grip is not shown. In FIGS. 1, 2, and 4, the cutting tool 12 is indicated by a two-dot chain line. In FIG. 2, the surrounding direction is indicated by an arrow L.

  The tool holder 10A shown in FIGS. 1 and 2 is formed of a fixed portion 11 that is fixed to a tool magazine of a machine tool such as a machining center, and a sandwiching portion 13 that sandwiches a peripheral surface of a cutting tool 12 such as an end mill, a mentor cutter, or a face mill. Has been. In the tool holder 10 </ b> A, as indicated by an arrow L in FIG. 2, a grip (not shown) of the clamping unit 13 rotates in the circumferential direction. In the tool holder 10 </ b> A, when the grip is in an open state, the cutting tool 13 enters between the sandwiching portions 13, the tool 12 enters between the sandwiching portions 13, the grip is closed, and the tool 12 is sandwiched between the grips. Is held in the state.

  The tool holder 10B shown in FIGS. 3 and 4 is formed of a cylindrical peripheral wall portion 14 fixed to a tool magazine of a machine tool such as a machining center, and an accommodating portion 15 that accommodates the cutting tool 12. In the tool holder 10 </ b> B, when the cutting tool 12 is inserted into the housing portion 15, the tip end portion of the tool 12 is fitted into the fitting member 16 installed in the housing portion 15, and the tool 12 is held in the housing portion 15.

  In the machine tool, the cutting tool 12 is held by the tool holders 10A and 10B when not in use, and the tool 12 is automatically replaced from the holders 10A and 10B according to the application. In the tool holder 10 </ b> A of FIGS. 1 and 2, the grip is opened when the cutting tool 12 is replaced, the tool 12 is removed from the clamping unit 13, and the tool 12 is attached to the spindle of the machine tool. In the tool holder 10B shown in FIGS. 3 and 4, when the cutting tool 12 is replaced, the fitting between the tip end of the tool 12 and the fitting member 16 is released, and the tool 12 is extracted from the accommodating portion 15. The tool 12 is a machine tool. It is attached to the main shaft.

  FIG. 5 is a view showing an example of the molding resin composition 17 used for making the tool holders 10A and 10B. These tool holders 10A and 10B are made by using a molding resin composition 17 shown in FIG. 5 and molding the molding resin composition 17 by pressing or injection molding. The molding resin composition 17 can be used as a molding material for not only the tool holders 10A and 10B but also other molded products.

  The molding resin composition 17 is made by mixing a thermosetting synthetic resin, inorganic fibers, and a resin-impregnated fiber material 30 (see FIG. 10) in which the entire natural fiber material is impregnated with a thermosetting synthetic resin. (See FIG. 11), the overall shape is uneven. The resin-impregnated fiber material 30 is made by mixing a natural fiber material and a thermosetting synthetic resin (including an organic solvent) (see FIG. 9). The inorganic fibers are added for the purpose of improving the fastness, mechanical strength, and thermal rigidity of the tool holders 10A and 10B (molded products) made from the molding resin composition 17. The natural fiber material is added for the purpose of imparting toughness and elasticity to the tool holders 10A and 10B made from the molding resin composition 17 and improving the rigidity and impact resistance of the holders 10A and 10B.

  As the thermosetting synthetic resin, it is preferable to use a phenolic resin 20 (see FIG. 9) such as a novolac phenolic resin or a resol phenolic resin, but in addition to the phenolic resin 20, an epoxy resin or melamine is used. Any of a resin, a urea resin, an unsaturated polyester resin, an alkyd resin, and a thermosetting polyimide can be used, and a resin obtained by mixing these resins at a predetermined ratio can also be used. In this embodiment, a phenolic resin 20 (hereinafter referred to as a phenol resin) will be described as an example of the thermosetting synthetic resin, but the thermosetting synthetic resin is not limited to the phenol resin 20.

  Glass fiber 39 (see FIG. 11) is preferably used as the inorganic fiber, but in addition to glass fiber 39, either carbon fiber or metal fiber can be used. Glass fiber, carbon fiber, metal It is also possible to use fibers in which at least two types of fibers are confused at a predetermined ratio. In this embodiment, the glass fiber 39 is described as an example of the inorganic fiber, but the purpose is not to limit the inorganic fiber to the glass fiber 39.

  As the natural fiber material, use at least one of a thread-like natural fiber and a cloth-like natural fiber, or a fiber in which both a thread-like natural fiber and a cloth-like natural fiber are confused at a predetermined ratio. Can do. As the natural fiber, at least one of plant fiber and animal fiber, or a fiber in which both plant fiber and animal fiber are confused at a predetermined ratio can be used. A pulverized pulp can also be used for the natural fiber. It is preferable to use wood pulp for the pulp. The pulverized pulp can be produced by pulverizing the pulp using a pulverizer such as a ball mill, a stirring mill, or a roller mill. These natural fiber materials have a moisture absorption of 1 to 10%, preferably 0.1 to 3%.

  Plant fibers include seed hair fibers such as cotton and kappok, bast fibers such as yellow hemp and kenaf, kouzo, mitsumata, and ganpi, leaf vein fibers such as sisal hemp, New Zealand hemp, raffia and pineapple, and petiole fibers such as manila hemp and banana. , Fruit fibers such as coconut palm and loofah, any one of stem trunk fibers such as wheat straw, rice straw, weeds, bamboo, palm, etc., or a fiber in which at least two of them are confused at a predetermined ratio be able to. In addition, it is preferable to use a cotton thread or a cotton cloth for the natural fiber. Animal fibers include wool, fine animal hair, vicuuna, camel, cashmere, angora and other animal hair fibers, silk fibers, feathers, or a mixture of at least two of these at a predetermined ratio. Can be used. In this embodiment, the cotton fiber 21 in the form of a thread and the cotton cloth 21 in the form of a cloth (see FIG. 9) will be described as examples of the natural fiber material, but the natural fiber material is not limited to the cotton thread 21 and the cotton cloth 21.

  In the resin-impregnated fiber material 30, the weight ratio (impregnation amount) of the phenol resin 20 (thermosetting synthetic resin) to 100% by weight of the cotton yarn 21 or the cotton cloth 21 (natural fiber material) is in the range of 10 to 40% by weight, preferably It is in the range of 25 to 30% by weight. When the weight ratio of the phenol resin 20 is less than 10% by weight, the entire cotton yarn 21 or the entire cotton cloth 21 cannot be coated with the phenol resin 20, and the tool holder is molded using the molding resin composition 17 of the present invention. The water resistance and moisture resistance of 10A and 10B cannot be improved. When the weight ratio of the phenol resin 20 exceeds 40% by weight, the operability of the resin-impregnated fiber material 30 is lowered, and the toughness and elasticity are imparted to the tool holders 10A and 10B molded using the molding resin composition 17. It cannot be applied, and the rigidity and impact resistance of the holders 10A and 10B cannot be improved.

  In the resin-impregnated fiber material 30, the weight ratio (impregnation amount) of the phenol resin 20 is in the above range, so that toughness and elasticity can be reliably imparted to the tool holders 10A, 10B made from the molding resin composition 17. In addition to improving the rigidity and impact resistance of the holders 10A and 10B, the entire cotton yarn 21 and the entire cotton cloth 21 are coated with the phenol resin 20, and the water resistance and moisture resistance of the holders 10A and 10B can be improved. .

  In the molding resin composition 17, the vertical and horizontal dimensions of the cloth-like cotton cloth 21 (natural fiber material) are in the range of 0.5 × 0.5 to 20 × 20 mm. When the vertical and horizontal dimensions of the cotton cloth 21 are less than 0.5 × 0.5 mm, it costs to cut the cotton cloth 21 into the dimensions, and as a result, the cost of the tool holders 10A and 10B made from the molding resin composition 17 is reduced. It will rise. If the vertical and horizontal dimensions of the cotton cloth 21 exceed 20 × 20 mm, it is difficult to coat the entire cotton cloth 21 with the phenol resin 20, and the water resistance and moisture resistance of the tool holders 10 </ b> A and 10 </ b> B molded using the molding resin composition 17 are difficult. Can not improve.

  In the molding resin composition 17, since the vertical and horizontal dimensions of the cotton cloth 21 are in the above range, the toughness and elasticity can be surely imparted to the tool holders 10A and 10B made from the molding resin composition 17, and the holders 10A and 10B The rigidity and impact resistance of 10B can be improved, and the entire cotton cloth 21 is coated with the phenol resin 20, so that the water resistance and moisture resistance of the holders 10A and 10B can be improved.

  In the molding resin composition 17, the length dimension of the thread-like cotton yarn 21 (natural fiber material) is in the range of 0.1 to 10 mm. If the length of the cotton yarn 21 is less than 0.1 mm, the cost for pulverizing the cotton yarn 21 to the length is increased. As a result, the cost of the tool holders 10A and 10B made from the molding resin composition 17 increases. Resulting in. When the length dimension of the cotton yarn 21 exceeds 10 mm, it is difficult to coat the entire cotton yarn 21 with the phenol resin 20, and the water resistance and moisture resistance of the tool holders 10A, 10B molded using the molding resin composition 17 are difficult. Cannot be improved.

  In the molding resin composition 17, since the length dimension of the cotton yarn 21 is in the above range, toughness and elasticity can be reliably imparted to the tool holders 10A, 10B made from the molding resin composition 17, and the holder 10A , 10B can be improved in rigidity and impact resistance, and the entire cotton yarn 21 can be coated with the phenol resin 20 to improve the water resistance and moisture resistance of the holders 10A, 10B.

  In the molding resin composition 17, the weight ratio (content) of the glass fiber 39 (inorganic fiber) to 100% by weight of the phenol resin 20 (thermosetting synthetic resin) is in the range of 5 to 15% by weight, preferably 8 to It is in the range of 12% by weight. When the weight ratio of the glass fibers 39 is less than 5% by weight, the ratio of the glass fibers 39 to the molding resin composition 17 is small, and the reinforcing function of the glass fibers 39 cannot be fully utilized. The fastness, mechanical strength, and thermal rigidity of the tool holders 10A and 10B molded using the above cannot be improved. When the weight ratio of the glass fiber 39 exceeds 15% by weight, the ratio of the glass fiber 39 to the molding resin composition 17 is too large, and a large amount of glass fiber 39 is formed on the surfaces of the tool holders 10A and 10B made from the molding resin composition 17. The glass fiber 39 is exposed, and the tool 12 may be worn by the glass fiber 39 when the cutting tool 12 is attached to and detached from the holders 10A and 10B.

  In the molding resin composition 17, since the weight ratio (content) of the glass fiber 39 is in the above range, the fastness, mechanical strength, and thermal rigidity of the tool holders 10A and 10B made from the molding resin composition 17 are improved. It can improve and can prevent the cutting tool 12 from being worn by the glass fiber 39.

  In the molding resin composition 17, the length of the glass fiber 39 (inorganic fiber) is in the range of 1 to 20 mm, preferably in the range of 1.3 to 1.5 mm. The filament of the glass fiber 39 (inorganic fiber) The diameter is in the range of 6 to 13 μm. If the length dimension of the glass fiber 39 is less than 1.0 mm and the filament diameter is less than 6 μm, the production of the glass fiber 39 having the dimension is costly. As a result, a tool made from the molding resin composition 17 The cost of the holders 10A and 10B will increase. If the length dimension of the glass fiber 39 exceeds 20 mm and the filament diameter exceeds 13 μm, it is difficult to uniformly disperse the glass fiber 39 over the entire area of the molding resin composition 17, and the reinforcing function of the glass fiber 39 is sufficient. The fastness, mechanical strength, and thermal rigidity of the tool holders 10A and 10B molded using the molding resin composition 17 cannot be improved. Further, the tool 12 may be worn by the glass fiber 39 exposed on the surfaces of the tool holders 10A and 10B.

  In the molding resin composition 17, since the length dimension and filament diameter of the glass fiber 39 are in the above ranges, the fastness, mechanical strength, and thermal rigidity of the tool holders 10A and 10B made from the molding resin composition 17 are improved. It can improve and can prevent the cutting tool 12 from being worn by the glass fiber 39.

  In the molding resin composition 17, the weight ratio (content) of the resin-impregnated fiber material 30 to 100% by weight of the phenol resin 20 (thermosetting synthetic resin) is in the range of 100 to 150% by weight, preferably 115 to 130% by weight. % Range. When the weight ratio of the resin-impregnated fiber material 30 is less than 100% by weight, the ratio of the cotton cloth 21 and the cotton yarn 21 to the molding resin composition 17 is small, and the tool holders 10A and 10B molded using the molding resin composition 17 are used. The toughness and elasticity cannot be imparted to the holder, and the rigidity and impact resistance of the holders 10A and 10B cannot be improved. When the weight ratio of the resin-impregnated fiber material 30 exceeds 150% by weight, the ratio of the cotton cloth 21 and the cotton thread 21 to the molding resin composition 17 is too large, and the entire cotton cloth 21 and the entire cotton thread 21 may be coated with the phenol resin 20. The water resistance and moisture resistance of the tool holders 10A and 10B molded using the molding resin composition 17 cannot be improved.

  In the molding resin composition 17, since the weight ratio (content) of the resin-impregnated fiber material 30 is in the above range, toughness and elasticity are surely imparted to the tool holders 10A and 10B made from the molding resin composition 17. It is possible to improve the rigidity and impact resistance of the holders 10A and 10B, and the entire cotton yarn 21 and the entire cotton cloth 21 are coated with the phenol resin 20 to improve the water resistance and moisture resistance of the holders 10A and 10B. be able to.

  The dimensional change rate of the tool holders 10A and 10B made from the molding resin composition 17 is in the range of 0.1 to 0.2%. The bending strength of the tool holders 10A and 10B made from the molding resin composition 17 is in the range of 100 to 130 MPa, and the bending elastic modulus of the holders 10A and 10B made from the molding resin composition 17 is It is in the range of 11000-12500 MPa. When the dimensional change rate of the tool holders 10A and 10B exceeds 0.2%, the dimensions of the holders 10A and 10B may change greatly due to the dimensional change over time, and the cutting tool 12 may not be held by the holders 10A and 10B. is there. When the bending strength of the tool holders 10A and 10B is less than 100 MPa and the bending elastic modulus of the holders 10A and 10B is less than 11000 MPa, the holders 10A and 10B are subjected to an impact when they are used. 10A and 10B may be damaged or broken, and the cutting tool 12 may not be held by the holders 10A and 10B. These tool holders 10A and 10B have excellent dimensional stability and excellent bending strength and bending elastic modulus by using the molding resin composition 17 having the above composition, and high fastness and mechanical strength. In addition to thermal rigidity, it has high rigidity and impact resistance.

  FIG. 6 is a view showing a test piece 50 used for measurement of a dimensional change rate, and FIG. 7 is a view showing a test piece 51 for a bending test. FIG. 8 is a diagram showing a bending test method. The dimensional change rates of the tool holders 10 </ b> A and 10 </ b> B were measured according to JIS K 6911 using each test piece 50 made from the molding resin composition 17. The apparatus used for measuring the dimensional change rate is an outer micrometer (dimension measuring instrument) defined in JIS B 7502, a mold for molding the test piece 50, and the mold is maintained at a predetermined temperature and pressure. A compression molding machine and a thermometer with a scale of 1 ° C. displayed up to 150 ° C. were used. The test piece 50 was molded into the shape shown in FIG. 6 using a predetermined mold and a compression molding machine.

  The molding shrinkage measurement procedure is as follows. The test piece 50 is taken out from the mold immediately after molding, and is left for 24 ± 1 hours at a temperature of 23 ± 2 ° C. and a relative humidity of 50 ± 5%, and then the outer diameter of the annular belt protruding on the front and back of the test piece 50 is set. Along the measurement lines orthogonal to each other, the dimensions of a total of four locations, two on the front surface and two on the back surface, were measured to 0.01 mm. Furthermore, after processing the outer diameter of the groove | channel of the metal mold | die corresponding to the test piece 50 on the same conditions, the outer diameter of the groove | channel was measured to 0.01 mm.

  The procedure for measuring the heat shrinkage rate is as follows. After heat-treating the test piece 50 under a heat treatment condition of a temperature of 110 ± 3 ° C., a short time of 48 ± 1 hour, and a standard time of 168 ± 2 hours, it is 3-4 in a room at a temperature of 23 ± 2 ° C. and a relative humidity of 50 ± 5% After being allowed to stand for a period of time, the outer diameter of the annular band protruding on the front and back surfaces of the test piece 50 was measured along a measurement line orthogonal to each other, and the dimensions of a total of four locations, two on the front surface and two on the back surface, were measured to 0.01 mm.

  The molding shrinkage was calculated by the following formula. Formula: MS = 1/4 {(D1-d1) / D1 + (D2-d2) / D2 + (D3-d3) / D3 + (D4-d4) / D4} × 100, where MS is the molding shrinkage ratio ( %), D1 to d4 are outer diameters (mm) of the annular band of the test piece 50 measured along the measurement line, and D1 to D4 correspond to d1 to d4 measured at room temperature of 23 ± 2 ° C. The outer diameter (mm) of the groove of the mold.

The heat shrinkage rate was calculated by the following formula. Formula: PS ₄₈ or PS ₁₆₈ = 1/4 {(d1-d1 ′) / d1 + (d2-d2 ′) / d2 + (d3-d3 ′) / d3 + (d4-d4 ′) / d4} × 100, where PS ₄₈ is the heat shrinkage rate (%) in the case of the heat treatment 48 hours, and PS ₁₆₈ is the heat shrinkage rate (%) in the case of the heat treatment 168 hours. d1 to d4 are outer diameters (mm) of the annular band of the test piece 50 measured along the measurement line, and d1 ′ to d4 ′ are measured at a room temperature of 23 ± 2 ° C. after the heat treatment under the heat treatment conditions. It is a dimension (mm) corresponding to d1 to d4.

  The bending strength and bending elastic modulus of the tool holders 10 </ b> A and 10 </ b> B were measured according to JIS K 6911 using the test piece 51 made from the molding resin composition 17. The apparatus used for measuring the dimensional change rate is a material testing machine that can keep the crosshead moving speed constant (with a tolerance of ± 1% with respect to the standard load of the material testing machine, and the load at break is 15% of its capacity. Metal pressure wedge with 5 ± 0.1mm roundness at the tip and metal with adjustable rounding distance of 2 ± 0.2mm at the tip. A fulcrum, an outer micrometer (dimension measuring device) defined in JIS B 7502, a dial gauge having a scale of 0.01 mm defined in JIS B 7503, and a minimum reading value of 0.02 mm defined in JIS B 7507 Used with calipers. As shown in FIG. 7, the test piece 51 was molded into a length of 80 mm or more, a height of 4 ± 0.2 mm, and a width of 10 ± 0.5 mm.

  The height and width of the test piece 51 were each accurately measured to 0.01 mm using an outer micrometer. Next, the test piece 51 is supported at a distance between fulcrums of 16h ± 0.5 mm, and as shown in FIG. 8, a load is applied to the center with a pressure wedge, and the load when the test piece 51 is broken is measured to 1N. did. When the broken part of the test piece 51 is other than the central part obtained by dividing the test piece 51 into three equal parts, it was not adopted as the test value and retested. The load speed was calculated by the following formula. Formula: V = (h / 2t) ± 0.2, where V is the load speed (mm / min), h is the height (mm) of the test piece 51, and t is the time (1 min). It is. When measuring the flexural modulus, the load and deflection were frequently read simultaneously so that a load-deflection curve could be drawn.

The bending strength was calculated by the following formula. _{Formula: σ fB = 3PL V / 2Wh} 2, wherein, sigma _fB is flexural strength (MPa), P is the load (N) when the test piece 51 was broken, _{L V,} the distance between fulcrums (Mm) and W are the width (mm) of the test piece 51. h is the height (mm) of the test piece 51.

The flexural modulus was calculated by the following formula. Formula: E _f = (L _V ³ / 4Wf ³ ) · (F / Y), where E _f is the flexural modulus (MPa), L _V is the distance between support points (mm), and W is The width (mm) and h of the test piece 51 are the height (mm) of the test piece 51. F / Y is the gradient (N / mm) of the linear portion of the load-deflection curve.

  FIG. 9 is a diagram for explaining an example of the first kneading step, and FIG. 10 is a diagram for explaining an example of the drying step following the first kneading step and an example of the first cooling step following the drying step in FIG. is there. FIG. 11 is a diagram for explaining an example of the second kneading step continued from the first cooling step of FIG. 10, and FIG. 12 is a diagram for explaining an example of the second cooling step continued from the second kneading step of FIG. is there. In FIG. 12, illustration of the molding resin composition 17 is omitted. The molding resin composition 17 shown in FIG. 5 is manufactured by going through the following steps: first kneading step → drying step → first cooling step → second kneading step → second cooling step.

  In the first kneading step, a mixer 23 for kneading while stirring liquid phenolic resin 20 (thermosetting synthetic resin), at least one of cotton yarn 21 and cotton cloth 21 (natural fiber material) and methyl alcohol 22 (organic solvent) is used. Is done. As the mixer 23, a Henschel mixer, a super mixer, or the like can be used. As shown in FIG. 9, the mixer 23 has a predetermined volume of the stirring and kneading tank 26 defined by the peripheral wall 24 and the bottom wall 25, a screw 27 installed in the stirring and kneading tank 26, and heating that surrounds the peripheral wall 24. And a pipe 28. A heating unit 29 for sending steam or hot water to the heating pipe 28 is attached to the mixer 23. Steam or hot water circulates through the heating pipe 28 and the heating unit 29.

  An example of the procedure in the first kneading step is as follows. After the liquid phenolic resin 20, at least one of the cotton yarn 21 and the cotton cloth 21, and the methyl alcohol 22 are put into the stirring kneading tank 26 of the mixer 23, the switch of the mixer 23 is turned on. When the switch is turned on, the mixer 23 and the heating unit 29 are operated, the screw 27 is rotated, steam and hot water are sent from the heating unit 29 to the heating pipe 28, and steam or hot water flowing in the heating pipe 28 is used. The mixer temperature is heated to 50-60 ° C.

  In the stirring and kneading tank 26, the liquid phenolic resin 20, the cotton yarn 21, the cotton cloth 21, and the methyl alcohol 22 are heated and stirred and kneaded by the screw 27, and a plurality of resin-impregnated fiber materials 30 are produced after a predetermined time. When the mixer temperature is less than 50 ° C., the reaction of the phenol resin 20 does not proceed, and the entire region of the cotton yarn 21 or the entire region of the cotton cloth 21 (a collection of cotton yarns 21) cannot be impregnated with the phenol resin 20. When the mixer temperature exceeds 60 ° C., the reaction of the phenol resin 20 proceeds early, and the physical properties of the phenol resin 20 may change from the expected one.

  In the stirring and kneading tank 26, the viscosity of the liquid phenolic resin 20 is lowered by the methyl alcohol 22, and the reaction of the liquid phenolic resin 20 slowly proceeds by the kneading by the screw 27 and the mixer temperature, and the entire cotton yarn 21 and the cotton cloth 21 (cotton yarn 21) The phenol resin 20 is impregnated over the entire area, and the entire cotton yarn 21 and the entire cotton cloth 21 (the aggregate of the cotton yarn 21) are coated with the phenol resin 20. The cotton cloth 21 is opened by the screw 27 of the mixer 23 and becomes an aggregate of the cotton yarn 21. The organic solvent includes at least one of methyl alcohol 22 (methanol), ethyl alcohol (ethanol), isopropyl alcohol, n-propyl alcohol, n-butyl alcohol, 2-butyl alcohol, isobutyl alcohol, and active aluminum alcohol. One can also be used.

  In the first kneading step, the amount (weight ratio) of the liquid phenol resin 20 (thermosetting synthetic resin) to the cotton yarn 21 and the cotton cloth 21 (natural fiber material) is liquid phenol with respect to 100% by weight of the cotton yarn 21 and the cotton cloth 21. The resin 20 is in the range of 10 to 40% by weight, preferably in the range of 25 to 30% by weight. When the input amount of the phenol resin 20 is less than 10% by weight, the entire cotton yarn 21 or the entire cotton cloth 21 cannot be coated with the phenol resin 20, and the tool holder is molded using the molding resin composition 17 of the present invention. The water resistance and moisture resistance of 10A and 10B cannot be improved. When the input amount of the phenol resin 20 exceeds 40% by weight, the operability of the resin-impregnated fiber material 30 is lowered, and the toughness and elasticity are imparted to the tool holders 10A and 10B molded using the molding resin composition 17. It cannot be applied, and the rigidity and impact resistance of the holders 10A and 10B cannot be improved. The vertical and horizontal dimensions of the cloth-like cotton fabric 21 (natural fiber material) used in the first kneading step are in the range of 0.5 × 0.5 to 20 × 20 mm, and the yarn-like cotton yarn 21 (natural fiber) The length dimension of the material) is in the range of 0.1-10 mm.

  In the first kneading step, liquid resin resin 20, cotton yarn 21 and / or cotton cloth 21, and methyl alcohol 22 are stirred and kneaded at a predetermined temperature for a predetermined time to produce the resin-impregnated fiber material 30, and then the drying shown in FIG. Proceed to the process. In the drying process, a drying cooling device 31 is used for drying the resin-impregnated fiber material 30 and cooling the resin-impregnated fiber material 30. As shown in FIG. 10, the drying and cooling device 31 includes a storage box 33 having an openable / closable door 32, a plurality of shelf frames 34 installed inside the storage box 33, and a plurality of net shelves 35 placed on the shelf frame 34. A blower 36 that sends air (hot air) heated to a predetermined temperature by a heater (not shown) or room temperature air into the storage box 33, and an exhaust pipe that exhausts the air in the storage box 33 out of the box 33 37. The temperature of the warm air is 110 to 130 ° C. The storage box 33 and the blower 36 are connected via a blower pipe 38. These net shelves 35 can be taken in and out of the storage box 33. In addition, the air blower 36 may have an air conditioning function of sending the cold air cooled to a predetermined temperature to the storage box 33.

  An example of the procedure in the drying step is as follows. The door 32 of the storage box 33 is opened, the net shelf 35 is taken out from the box 33, the resin-impregnated fiber material 30 made in the first kneading step is taken out from the stirring kneading tank 26 of the mixer 23, and then the resin-impregnated fiber material 30 is removed. They are placed on the net shelf 35. The net shelf 35 on which the resin-impregnated fiber material 30 is placed is stored again in the storage box 33, the door 32 is closed, and the switch of the drying cooling device 31 is turned on. When the switch is turned on, the blower 36 is operated, and hot air having a predetermined temperature heated by the heater flows into the storage box 33 from the blower pipe 38. Inside the storage box 33, warm air circulates through the storage box 33 and is then exhausted from the exhaust pipe 37 to the outside of the storage box 33. The resin-impregnated fiber material 30 is dried by warm air circulating in the storage box 33.

  The hot air is allowed to flow into the storage box 33 for a predetermined time, and the hot air is blown onto the resin-impregnated fiber material 30 for a predetermined time to dry the resin-impregnated fiber material 30, and then the process proceeds to the first cooling step. In the first cooling step, the drying cooling device 31 of FIG. 10 is used. When the blowing time of warm air at a predetermined temperature has elapsed, the heater is turned off and the warm air is changed to room temperature air. Room temperature air flows from the blower pipe 38 into the storage box 33. Inside the storage box 33, room temperature air is circulated through the storage box 33 and then exhausted from the exhaust pipe 37 to the outside of the storage box 33. The resin-impregnated fiber material 30 is cooled to room temperature by room temperature air circulating in the storage box 33. In addition, when the air blower 36 has an air-conditioning function, the cold air cooled by the air blower 36 to predetermined temperature flows in into the storage box 33 from the air blower pipe 38. Inside the storage box 33, after the cool air circulates through the storage box 33, it is exhausted from the exhaust pipe 37 to the outside of the storage box 33. The resin-impregnated fiber material 30 is cooled to a predetermined temperature by cold air circulating in the storage box 33.

  In the first cooling step, room temperature air or cold air is blown onto the resin-impregnated fiber material 30 for a predetermined time to cool the resin-impregnated fiber material 30, and then the process proceeds to the second kneading step. In the second kneading step, a mixer 23 similar to that shown in FIG. 9 is used in which the resin-impregnated fiber material 30, the liquid phenol resin 20 (thermosetting synthetic resin), and the glass fibers 39 (inorganic fibers) are kneaded while stirring. An example of the procedure in the second kneading step is as follows. After the resin-impregnated fiber material 30, the liquid phenol resin 20, and the glass fiber 39 are put into the stirring kneading tank 26 of the mixer 23, the switch of the mixer 23 is turned on. When the switch is turned on, the mixer 23 and the heating unit 29 are operated, the screw 27 is rotated, steam and hot water are sent from the heating unit 29 to the heating pipe 28, and steam or hot water flowing in the heating pipe 28 is used. The mixer temperature is heated to 55-65 ° C.

  In the stirring and kneading tank 26, the resin-impregnated fiber material 30, the liquid phenol resin 20 and the glass fiber 39 are stirred and kneaded by the screw 27 while being heated. A plurality of three-dimensional molding resin compositions 17 shown in FIG. 5 in which the fibers 39 are mixed are produced. Inside the stirring and kneading tank 26, the resin impregnated fiber material 30, the phenol resin 20 and the glass fiber 39 heated at a mixer temperature of 55 to 65 ° C. have their reaction heat of 90 to 95 ° C. due to their frictional heat. In the second kneading step, the reaction heat of the resin-impregnated fiber material 30, the phenol resin 20, and the glass fiber 39 is maintained in the range of 90 to 95 ° C. The frictional heat of the resin impregnated fiber material 30, the liquid phenolic resin 20, and the glass fiber 39 to be introduced into the stirring and kneading tank 26 is determined depending on the correlation between the mixer temperature and the rotational speed of the screw 27. Therefore, in order to keep the heat of reaction in the range of 90 to 95 ° C., the mixer temperature relative to the total weight (the range of 55 to 65 ° C.) and the rotational speed of the screw 27 are determined based on the correlation, and the mixer temperature Then, the mixer 23 is heated and the screw 27 is rotated at the rotation speed.

  If the mixer temperature is less than 55 ° C., the heat of reaction between the fat-impregnated fiber material 30, the phenol resin 20 and the glass fiber 39 cannot be maintained in the range of 90 to 95 ° C., and the entire cotton yarn 21 or the cotton fabric 21 (cotton yarn) 21) the entire region cannot be coated with the phenolic resin 20. When the mixer temperature exceeds 65 ° C., the reaction heat of the fat-impregnated fiber material 30, the phenol resin 20 and the glass fiber 39 exceeds 95 ° C., the reaction of the phenol resin 20 proceeds early, and the physical properties of the phenol resin 20 and the cotton yarn 21 or the physical properties of the cotton cloth 21 may change from that expected.

  In the second kneading step, the input amount (weight ratio) of the glass fiber 39 to the liquid phenol resin 20 is in the range of 5 to 15% by weight, preferably 8 to 12% of the glass fiber 39 with respect to 100% by weight of the phenol resin 20. It is in the range of weight percent. If the input amount of the glass fiber 39 is less than 5% by weight, the ratio of the glass fiber 39 to the molding resin composition 17 is small, and the reinforcing function of the glass fiber 39 cannot be fully utilized. When the amount of the glass fiber 39 input exceeds 15% by weight, the ratio of the glass fiber 39 to the molding resin composition 17 is too large, and the surface of the tool holders 10A and 10B made from the molding resin composition 17 has a large amount. The glass fiber 39 is exposed, and the tool 12 may be worn by the glass fiber 39 when the cutting tool 12 is attached to and detached from the holders 10A and 10B. In addition, the length dimension of the glass fiber 39 used in a 2nd kneading | mixing process exists in the range of 1-20 mm, Preferably, it is the range of 1.3-1.5 mm, The filament diameter of the glass fiber 39 is 6- It is in the range of 13 μm.

  In the second kneading step, the amount (weight ratio) of the resin-impregnated fiber material 30 to the liquid phenol resin 20 is in the range of 100 to 150% by weight of the resin-impregnated fiber material 30 with respect to 100% by weight of the phenol resin 20, preferably 115 to 130% by weight. When the input amount of the resin-impregnated fiber material 30 is less than 100% by weight, the ratio of the cotton cloth 21 and the cotton yarn 21 to the molding resin composition 17 is small, and the tool holders 10A and 10B molded using the molding resin composition 17 are used. The toughness and elasticity cannot be imparted to the holder, and the rigidity and impact resistance of the holders 10A and 10B cannot be improved. When the input amount of the resin-impregnated fiber material 30 exceeds 150% by weight, the ratio of the cotton cloth 21 and the cotton thread 21 to the molding resin composition 17 is too large, and the entire cotton cloth 21 and the entire cotton thread 21 may be coated with the phenol resin 20. The water resistance and moisture resistance of the tool holders 10A and 10B molded using the molding resin composition 17 cannot be improved.

  In the second kneading step, the liquid phenol resin 20, the resin-impregnated fiber material 30 and the glass fiber 39 are stirred and kneaded at a predetermined temperature for a predetermined time to form the molding resin composition 17, and then the second cooling in FIG. Proceed to the process. In the second cooling step, a cooling device 40 that cools the molding resin composition 17 is used. As shown in FIG. 12, the cooling device 40 includes a stirring tank 43 having a predetermined volume defined by the peripheral wall 41 and the bottom wall 42, a stirring ribbon 44 installed in the stirring tank 43, and a room temperature in the stirring tank 43. It forms from the air blower 45 which ventilates air. The blower 45 may have an air conditioning function of sending the cold air cooled to a predetermined temperature to the stirring tank 43.

  An example of the procedure in the second cooling step is as follows. The molding resin composition 17 is taken out from the mixer 23 from the stirring kneading tank 26, and after the molding resin composition 17 is put into the stirring tank 43 of the cooling device 40, the switch of the cooling device 40 is turned on. When the switch is turned on, the blower 45 is activated, and air at room temperature is blown into the stirring tank 43 and the stirring ribbon 44 rotates. Inside the stirring tank 43, the molding resin composition 17 is cooled by air at room temperature while the molding resin composition 17 is stirred by the stirring ribbon 44. In addition, when the air blower 45 has an air-conditioning function, the cold air cooled to the predetermined temperature by the air blower 45 is blown into the stirring tank 43. Inside the stirring tank 43, the molding resin composition 17 is cooled to a predetermined temperature by cold air. Room temperature air or cold air is allowed to flow into the agitation tank 43 for a predetermined time, air or cold air is blown onto the molding resin composition 17 for a predetermined time to cool the molding resin composition 17, and the molding resin composition 17 of FIG. Is manufactured.

  Hereinafter, examples and comparative examples of the molding resin composition 17 manufactured by the above manufacturing method will be described, and tool holders 10A and 10B molded using the molding resin composition 17 of these examples and comparative examples. The dimensional change rate (%), bending strength (MPa), and bending elastic modulus (MPa) will be described. In addition, the dimensional change rate of the tool holders 10A and 10B is as measured according to JIS K 6911 using the test piece 50 as described above. Moreover, the bending strength and bending elastic modulus of the tool holders 10A and 10B are as measured according to JIS K 6911 using the test piece 51 as described above.

  In Example (1), the first kneading step, the drying step, and the first cooling in which liquid phenolic resin 20 (thermosetting synthetic resin), cotton cloth 21 (natural fiber material), and methyl alcohol 22 (organic solvent) are stirred and kneaded. The resin-impregnated fiber material 30 is produced by the process, and the resin-impregnated fiber material 30, the liquid phenol resin 20 and the glass fiber 39 are stirred and kneaded (second kneading step), and then the molding resin composition 17 is cooled (second). Cooling step), a molding resin composition 17 was produced.

  In Example (1), the input amount (weight ratio) of the resin-impregnated fiber material 30 with respect to the liquid phenol resin 20 is the resin-impregnated fiber material 30 (105% by weight) with respect to the phenol resin 20 (100% by weight). The input amount (weight ratio) of the glass fiber 39 with respect to the phenol resin 20 is the glass fiber 39 (8 wt%) with respect to the phenol resin 20 (100 wt%). The dimensional change rate of the tool holders 10A and 10B (test pieces 50 and 51) molded using the molding resin composition 17 of Example (1) is 0.18 (%), and the bending strength is 110 (MPa). The flexural modulus was 12500 (MPa). Tool holders 10A and 10B molded using the molding resin composition 17 of Example (1) had a small dimensional change rate, and exhibited good bending strength and bending elastic modulus.

  In Example (2), the molding resin composition 17 was manufactured by the same process as Example (1). In Example (2), the input amount (weight ratio) of the resin-impregnated fiber material 30 with respect to the liquid phenol resin 20 is the resin-impregnated fiber material 30 (125% by weight) with respect to the phenol resin 20 (100% by weight). The input amount (weight ratio) of the glass fiber 39 with respect to the phenol resin 20 is the glass fiber 39 (9% by weight) with respect to the phenol resin 20 (100% by weight). The dimensional change rate of the tool holders 10A and 10B (test pieces 50 and 51) molded using the molding resin composition 17 of Example (2) is 0.16 (%), and the bending strength is 115 (MPa). The flexural modulus was 12000 (MPa). The tool holders 10A and 10B molded using the molding resin composition 17 of Example (2) had a small dimensional change rate and exhibited good bending strength and bending elastic modulus.

  In Example (3), the molding resin composition 17 was manufactured by the same process as Example (1). In Example (3), the input amount (weight ratio) of the resin-impregnated fiber material 30 with respect to the liquid phenol resin 20 is the resin-impregnated fiber material 30 (145% by weight) with respect to the phenol resin 20 (100% by weight). The input amount (weight ratio) of the glass fiber 39 with respect to the phenol resin 20 is the glass fiber 39 (12% by weight) with respect to the phenol resin 20 (100% by weight). The dimensional change rate of the tool holders 10A and 10B (test pieces 50 and 51) molded using the molding resin composition 17 of Example (3) is 0.13 (%), and the bending strength is 120 (MPa). The flexural modulus was 11800 (MPa). Tool holders 10A and 10B molded using the molding resin composition 17 of Example (3) had a small dimensional change rate, and exhibited good bending strength and bending elastic modulus.

  In the example (4), the resin-impregnated fiber material 30 is obtained by the first kneading step, the drying step, and the first cooling step in which the liquid phenolic resin 20, the cotton yarn 21 (cotton yarn 1 vs. cotton fabric 1) and methyl alcohol 22 are stirred and kneaded. After the resin impregnated fiber material 30, the liquid phenol resin 20 and the glass fiber 39 are stirred and kneaded (second kneading step), the molding resin composition 17 is cooled (second cooling step) to form a molding resin composition. Article 17 was produced.

  In Example (4), the input amount (weight ratio) of the resin-impregnated fiber material 30 with respect to the liquid phenol resin 20 is the resin-impregnated fiber material 30 (105 wt%) with respect to the phenol resin 20 (100 wt%). The input amount (weight ratio) of the glass fiber 39 with respect to the phenol resin 20 is the glass fiber 39 (8 wt%) with respect to the phenol resin 20 (100 wt%). Tool holders 10A and 10B (test pieces 50 and 51) molded using the molding resin composition 17 of Example (4) have a dimensional change rate of 0.17 (%) and a bending strength of 110 (MPa). The flexural modulus was 12000 (MPa). Tool holders 10A and 10B molded using the molding resin composition 17 of Example (4) had a small dimensional change rate, and exhibited good bending strength and bending elastic modulus.

  In Example (5), the molding resin composition 17 was manufactured by the same process as Example (4). In Example (5), the input amount (weight ratio) of the resin-impregnated fiber material 30 with respect to the liquid phenol resin 20 is the resin-impregnated fiber material 39 (125% by weight) with respect to the phenol resin 20 (100% by weight). The input amount (weight ratio) of the glass fiber 39 with respect to the phenol resin 20 is the glass fiber 39 (9% by weight) with respect to the phenol resin 20 (100% by weight). The dimensional change rate of the tool holders 10A and 10B (test pieces 50 and 51) molded using the molding resin composition 17 of Example (5) is 0.15 (%), and the bending strength is 120 (MPa). The flexural modulus was 11900 (MPa). Tool holders 10A and 10B molded using the molding resin composition 17 of Example (5) had a small dimensional change rate, and exhibited good bending strength and bending elastic modulus.

  In Example (6), the molding resin composition 17 was manufactured by the same process as Example (4). In Example (6), the input amount (weight ratio) of the resin-impregnated fiber material 30 with respect to the liquid phenol resin 20 is the resin-impregnated fiber material 30 (145% by weight) with respect to the phenol resin 20 (100% by weight). The input amount (weight ratio) of the glass fiber 39 with respect to the phenol resin 20 is the glass fiber 39 (12% by weight) with respect to the phenol resin 20 (100% by weight). The dimensional change rate of the tool holders 10A and 10B (test pieces 50 and 51) molded using the molding resin composition 17 of Example (5) is 0.13 (%), and the bending strength is 115 (MPa). The flexural modulus was 11800 (MPa). Tool holders 10A and 10B molded using the molding resin composition 17 of Example (5) had a small dimensional change rate, and exhibited good bending strength and bending elastic modulus.

  In Comparative Example (1), the first kneading step, the drying step, and the first cooling in which liquid phenol resin 20 (thermosetting synthetic resin), cotton cloth 21 (natural fiber material), and methyl alcohol 22 (organic solvent) are stirred and kneaded. The resin-impregnated fiber material 30 is produced by the process, and the resin-impregnated fiber material 30, the liquid phenol resin 20 and the glass fiber 39 are stirred and kneaded (second kneading step), and then the molding resin composition 17 is cooled (second). Cooling step), a molding resin composition 17 was produced.

  In Comparative Example (1), the input amount (weight ratio) of the resin-impregnated fiber material 30 with respect to the liquid phenol resin 20 is the resin-impregnated fiber material 39 (90% by weight) with respect to the phenol resin 20 (100% by weight). The input amount (weight ratio) of the glass fiber 39 with respect to the phenol resin 20 is the glass fiber 39 (8 wt%) with respect to the phenol resin 20 (100 wt%). Tool holders 10A and 10B (test pieces 50 and 51) molded using the molding resin composition 17 of Comparative Example (1) have a dimensional change rate of 0.12 (%) and a bending strength of 90 (MPa). The flexural modulus was 9000 (MPa). Tool holders 10A and 10B molded using the molding resin composition 17 of Comparative Example (1) had a small dimensional change rate, but lacked bending strength and bending elastic modulus.

  In Comparative Example (2), the molding resin composition 17 was produced by the same process as in Comparative Example (1). In Comparative Example (2), the input amount (weight ratio) of the resin-impregnated fiber material 30 with respect to the liquid phenol resin 20 is the resin-impregnated fiber material 30 (160% by weight) with respect to the phenol resin 20 (100% by weight). The input amount (weight ratio) of the glass fiber 39 with respect to the phenol resin 20 is the glass fiber 39 (9% by weight) with respect to the phenol resin 20 (100% by weight). It was found that the molding resin composition 17 of Comparative Example (2) was not suitable for molding because its fluidity was poor in molding using the molding resin composition.

  In the comparative example (3), the resin-impregnated fiber material 30 is prepared by the first kneading step, the drying step, and the first cooling step in which the liquid phenolic resin 20, the cotton yarn 21 (cotton yarn 1 vs. cotton fabric 1) and methyl alcohol 22 are kneaded and kneaded. After the resin impregnated fiber material 30, the liquid phenol resin 20 and the glass fiber 39 are stirred and kneaded (second kneading step), the molding resin composition 17 is cooled (second cooling step) to form a molding resin composition. Article 17 was produced.

  In Comparative Example (3), the input amount (weight ratio) of the resin-impregnated fiber material 30 with respect to the liquid phenol resin 20 is the resin-impregnated fiber material 30 (90% by weight) with respect to the phenol resin 20 (100% by weight). The input amount (weight ratio) of the glass fiber 39 with respect to the phenol resin 20 is the glass fiber 39 (8 wt%) with respect to the phenol resin 20 (100 wt%). The dimensional change rate of the tool holders 10A and 10B (test pieces 50 and 51) molded using the molding resin composition 17 of Comparative Example (3) is 0.13 (%), and the bending strength is 90 (MPa). The flexural modulus was 8500 (MPa). Tool holders 10A and 10B molded using the molding resin composition 17 of Comparative Example (3) had a small dimensional change rate, but had insufficient bending strength and bending elastic modulus.

  In Comparative Example (4), a molding resin composition 17 was produced by the same process as Comparative Example (3). In Comparative Example (4), the input amount (weight ratio) of the resin-impregnated fiber material 30 with respect to the liquid phenol resin 20 is the resin-impregnated fiber material 30 (160% by weight) with respect to the phenol resin 20 (100% by weight). The input amount (weight ratio) of the glass fiber 39 with respect to the phenol resin 20 is the glass fiber 39 (9% by weight) with respect to the phenol resin 20 (100% by weight). In the molding resin composition 17 of the comparative example (4), it was found that the fluidity of the molding resin composition 17 in the molding process using the molding resin composition 17 was not suitable for the molding process.

  In Comparative Example (5), the liquid phenol resin 20, the cotton cloth 21, and the glass fiber 39 were stirred and kneaded (kneading step), and then the molding resin composition was cooled (cooling step) to produce a molding resin composition. . In Comparative Example (5), the input amount (weight ratio) of the cotton cloth 21 with respect to the liquid phenol resin 20 is the cotton cloth 21 (100 weight%) with respect to the phenol resin 20 (100 weight%). The input amount (weight ratio) of 39 is glass fiber 39 (8 wt%) with respect to phenol resin 20 (100 wt%). The dimensional change rate of tool holders 10A and 10B (test pieces 50 and 51) molded using the molding resin composition of Comparative Example (5) is 0.36 (%), the bending strength is 115 (MPa), The flexural modulus was 12000 (MPa). The tool holders 10A and 10B molded using the molding resin composition of Comparative Example (5) have good bending strength and flexural modulus, but have a large dimensional change rate.

  As is clear from the above Examples and Comparative Examples, toughness and elasticity can be imparted to the tool holders 10A and 10B (molded products) made therefrom by using the molding resin composition 17 of the present invention. The tool holders 10A and 10B having high mechanical strength, thermal rigidity, and impact resistance can be made by using this. In the molding resin composition 17, the phenol resin 20 is impregnated in the entire cotton yarn 21 or the entire cotton cloth 21, and the entire area of the cotton yarn 21 or the entire cotton cloth 21 is coated with the phenol resin 20. Moisture does not permeate into the cotton yarn 21 or the cotton cloth 21, and the tool holders 10A and 10B made therefrom have high water resistance and moisture resistance. Even if moisture adheres to the tool holders 10A and 10B, The tool holders 10A and 10B having excellent dimensional stability can be made without penetrating the tool holders 10A and 10B.

10A Tool holder 10B Tool holder 12 Cutting tool 17 Molding resin composition 20 Phenolic resin (thermosetting synthetic resin)
21 Cotton yarn, cotton cloth (natural fiber material)
22 Methyl alcohol (organic solvent)
30 Resin-impregnated fiber material 39 Glass fiber (inorganic fiber)

Claims (8)

  It is made by mixing a thermosetting synthetic resin, an inorganic fiber, and a resin-impregnated fiber material in which the entire natural fiber material is impregnated with the thermosetting synthetic resin, and the inorganic with respect to 100% by weight of the thermosetting resin. Molding, wherein the weight ratio of fibers is in the range of 5 to 15% by weight, and the weight ratio of the resin-impregnated fiber material to 100% by weight of the thermosetting resin is in the range of 100 to 150% by weight. Resin composition.   The resin composition for molding according to claim 1, wherein in the resin-impregnated fiber material, a weight ratio of the thermosetting synthetic resin to 100% by weight of the natural fiber material is in a range of 10 to 40% by weight.   In the resin-impregnated fiber material, the natural fiber material is impregnated with the thermosetting synthetic resin in a state where the viscosity is lowered by adding an organic solvent to the thermosetting synthetic resin, so that the whole natural fiber is The molding resin composition according to claim 1 or 2, which is coated with a thermosetting synthetic resin.   The natural fiber material has at least one of a cloth shape and a thread shape, and the vertical and horizontal dimensions of the cloth-like natural fiber material are in a range of 0.5 × 0.5 to 20 × 20 mm, and the thread shape The molding resin composition according to any one of claims 1 to 3, wherein the natural fiber material has a length dimension of 0.1 to 10 mm.   The molding resin composition according to any one of claims 1 to 4, wherein a length dimension of the inorganic fibers is in a range of 1 to 20 mm, and a filament diameter of the inorganic fibers is in a range of 6 to 13 µm.   6. The thermosetting synthetic resin is a phenol-based resin, the natural fiber material is at least one of cotton yarn and cotton cloth, and the inorganic fiber is glass fiber. Molding resin composition.   The molding resin composition is used as a molding material for a tool holder of a tool used for processing using a water-soluble cutting oil, and the dimensional change of the tool holder molded using the molding resin composition The molding resin composition according to any one of claims 1 to 6, wherein the rate is in a range of 0.1 to 0.2%.   The bending strength of the tool holder molded using the molding resin composition is in the range of 100 to 130 MPa, and the bending strength of the tool holder molded using the molding resin composition. Is in the range of 11000 to 12500 MPa, The molding resin composition according to claim 7.

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