JP2019081969A - Die for forming fiber bundle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fiber bundle forming die excellent in abrasion resistance and slipperiness with respect to a fiber bundle.
SOLUTION: The fiber bundle forming die of the present disclosure is a cylindrical member having a sliding contact portion with a fiber on the inner peripheral surface, and the sliding contact portion is made of titanium carbide ceramic, titanium carbonitride ceramic, nitrided It is made of any of titanium based ceramics, aluminum oxide based ceramics, zirconium oxide based ceramics, composite ceramics of aluminum oxide and zirconium oxide, and the arithmetic mean roughness Ra of the surface of the sliding contact portion is 0.5 μm or more and 1.5 μm or less is there.
[Selected figure] Figure 1

Description

  The present disclosure relates to a fiber bundle forming die.

  A bundle of fibers such as an acrylic fiber sliver is used for a liquid supply body such as a pen point and a relay core. The liquid supply is obtained by pressing the fibers through a heated fiber bundle forming die and then drying and curing. Patent Document 1 mentions metal, resin and ceramics as the material of the fiber bundle forming die used for forming the liquid supply body.

Unexamined-Japanese-Patent No. 2004-299246

  An object of the present disclosure is to provide a fiber bundle forming die excellent in abrasion resistance and slipperiness with respect to a fiber bundle.

  The fiber bundle molding die of the present disclosure is a cylindrical member having a sliding contact portion with fibers on the inner circumferential surface. The sliding contact portion is made of any of titanium carbide based ceramics, titanium carbonitride based ceramics, titanium nitride based ceramics, aluminum oxide based ceramics, zirconium oxide based ceramics, and composite ceramics of aluminum oxide and zirconium oxide. Moreover, arithmetic mean roughness Ra of the surface of the said sliding contact part is 0.5 micrometer or more and 1.5 micrometers or less.

  The fiber bundle molding die of the present disclosure can be used for a long time because it is excellent in abrasion resistance and slipperiness with respect to the fiber bundle.

It is a schematic diagram of the liquid supply body (fiber bundle) manufacturing apparatus using the dice | dies for fiber bundle formation of this indication.

  Hereinafter, the fiber bundle forming die of the present disclosure will be described in detail with reference to the drawings. FIG. 1 is a schematic view of a liquid supply body (fiber bundle) manufacturing apparatus (hereinafter simply referred to as a manufacturing apparatus) using the fiber bundle forming die of the present disclosure.

  The manufacturing apparatus 10 includes a fiber bundle primary forming die 1, a fiber bundle secondary forming die 2, a resin liquid tank 3, a microwave heating device 4, a heating device 5, and a cutting unit 6 in the order of manufacturing steps. . In addition, in FIG. 1, about the thing in the middle process until it becomes the fiber bundle 7, the code | symbol of 7a-7f shall be attached | subjected and demonstrated. The fiber bundle 7 is, for example, an assembly in which nylon fibers, polyester fibers, acrylic fibers, polyethylene terephthalate fibers or fibers obtained by mixing them are gathered in the longitudinal direction.

The fiber bundle primary forming die 1 is a die for heating and primary compressing the fiber bundle 7a, and the fiber bundle 7a is heated and compressed to increase the bulk of the fiber bundle 7a and to cross each fiber to make the cross section It is intended to be in the form of a net.

  The fiber bundle secondary forming die 2 is a die for secondary compression of the fiber bundle 7b, and is further compressed to form the fiber bundle 7b into a desired cross-sectional shape. The cross-sectional shape in the direction perpendicular to the through holes of the fiber bundle secondary forming die 2 is the same as the contour shape of the cross section of the fiber bundle 7 to be formed. Specifically, if the cross-sectional shape is circular, the contour shape of the cross section of the fiber bundle 7 is also circular, and if the cross sectional shape is rectangular, the contour shape of the cross section of the fiber bundle 7 is rectangular .

  The resin liquid tank 3 is to allow the resin liquid to permeate between the fibers constituting the fiber bundle 7c passing through the resin liquid in the tank.

  The microwave heating device 4 absorbs microwave energy and instantaneously heats the fiber bundle 7d by, for example, irradiating microwaves with a frequency of 2450 MHz to dry and primarily cure the fiber bundle 7d. is there.

  The heating device 5 heats the fiber bundle 7e to perform secondary curing, and evaporates and removes the remaining resin liquid. The cutting unit 6 cuts the fiber bundle 7 f from which the resin liquid has been removed into a desired length.

  The fiber bundle forming die of the present disclosure corresponds to the above-described fiber bundle secondary forming die 2. Hereinafter, the fiber bundle molding die 2 will be described and described. The fiber bundle molding die 2 is a cylindrical member having a sliding contact portion with fibers on the inner peripheral surface. The sliding contact portion is made of any of titanium carbide based ceramics, titanium carbonitride based ceramics, titanium nitride based ceramics, aluminum oxide based ceramics, zirconium oxide based ceramics, aluminum oxide and zirconium oxide composite ceramics. The ceramics listed here are excellent in mechanical properties. The sliding contact portion of the fiber bundle forming die 2 has an arithmetic average roughness Ra of 0.5 to 1.5 μm. Since the fiber bundle molding die 2 of the present disclosure is excellent in the abrasion resistance and slipperiness with respect to the fiber bundle by satisfying the above configuration, the liquid supply body is manufactured over a long period of time. Can.

  As mechanical properties of the above-mentioned ceramics, for example, Vickers hardness based on JIS R 1610: 2003 is 10 GPa or more, and 3-point bending strength based on JIS R 1601: 2008 is 310 MPa or more.

  While the arithmetic average roughness Ra of the surface of the sliding contact portion in the fiber bundle forming die 2 of the present disclosure is 0.5 μm or more and 1.5 μm or less, the arithmetic average roughness Ra of the surface of the sliding contact portion is 0. When it is less than 5 μm, even if the fiber is in sliding contact with the surface, the fiber is less likely to be subjected to an appropriate frictional force, and the fiber is likely to slip. In addition, when the arithmetic mean roughness Ra of the surface of the sliding contact portion exceeds 1.5 μm, the frictional resistance when the fiber is in sliding contact with the surface becomes large, and the supply and discharge of the fiber can not be performed promptly.

  Note that, in the case of titanium carbide based ceramics, the above-mentioned ceramic constituting the sliding contact portion is, for example, a ceramic in which titanium carbide occupies 70% by mass or more in 100% by mass of all components constituting the sliding contact portion, The same applies to titanium carbonitride ceramics, titanium nitride ceramics, aluminum oxide ceramics and zirconium oxide ceramics. Furthermore, aluminum oxide and zirconium oxide composite ceramics contain at least 10% by mass or more of aluminum oxide and zirconium oxide in 100% by mass of all components constituting the sliding contact portion, and the total content is 70% by mass It is a ceramic that occupies the above.

  Here, the component which comprises ceramics can be identified from the measurement result by the X-ray-diffraction apparatus using a CuK alpha ray, and content of each component is ICP (Inductively Coupled Plasma) emission spectroscopy or fluorescence X, for example It can be determined by a line analyzer.

  In addition, the sliding contact portion may be made of an aluminum oxide ceramic, the relative density is 95% or more, and the average crystal grain size of the aluminum oxide crystal may be 5 μm or less.

  With such a configuration, since the crystal particles of aluminum oxide are fine and dense, the mechanical properties of the sliding contact portion are further excellent, and since the crystal particles are less dropped, the abrasion resistance is further excellent.

  Here, the average grain size is in the range of 112 μm in the horizontal direction and 80 μm in the vertical direction, with the surface of the sliding portion as the measurement surface and a magnification of 1000 times using a scanning electron microscope To shoot. Then, using the picture taken, draw four straight lines of the same length on the picture, and divide the number of crystals present on the four straight lines by the total length of these straight lines to obtain an average grain size. The diameter can be determined. At this time, the length per straight line may be 20 μm. If grain boundaries are difficult to identify, the surface of the sliding contact portion is polished until the arithmetic mean roughness Ra becomes 0.4 μm or less, and then the temperature range lower by 50 to 100 ° C. from the sintering temperature at sintering of ceramics. The surface subjected to thermal switching in the above can be used as the measurement surface. The sliding contact portion may have an average value of skewness Rsk on the surface of −1 or more and 1 or less. When the average value of the skewness Rsk is in the above-mentioned range, since the unevenness of the unevenness on the surface is small, the distortion of the formed fiber bundle 7 can be reduced in addition to the excellent abrasion resistance.

  Arithmetic mean roughness Ra and skewness Rsk may be determined in accordance with JIS B 0601: 2001 using, for example, a laser microscope VK-9500 manufactured by Keyence Corporation. When using a laser microscope VK-9510, for example, the measurement mode is color depth, the measurement magnification is 400 times, the measurement range per point is 112 μm × 84 μm, the measurement pitch is 0.05 μm, and the cutoff filter λs is 2.5 μm. The cutoff filter λc may be 0.08 mm, and eight measurement points may be obtained.

  Further, the tubular member including the sliding contact portion may be made of any of aluminum oxide ceramic, zirconium oxide ceramic, or composite ceramic of aluminum oxide and zirconium oxide.

  Such a ceramic is excellent in heat uniformity applied to each portion of the fiber bundle 7b as compared with the case where the heat conductivity is low and the heat conductivity is high, so that the network structure obtained by fusing the fibers is more Become uniform.

  Further, the tubular member may be made of a joined body in which the bonding layer is positioned along the axial direction of the through hole. Note that the axial direction of the through hole can be reworded as the traveling direction of the fiber bundle 7 b supplied to the fiber bundle forming die 2.

  When the tubular member is made of a joined body in which the bonding layer is located along the axial direction of the through hole, for example, two members having semicircular recesses in the axial cross section of the through hole are produced and joined. Thus, the through-hole can be formed into a rectangular shape by forming the through-hole in a circular shape or by manufacturing and joining two members having a rectangular recess.

As described above, when the tubular member is a bonded body in which the bonding layer is positioned along the axial direction of the through hole, the degree of freedom in design of the through hole shape which is a passage for supplying and discharging the fiber bundle is high. Therefore, fiber bundles 7 of various cross-sectional shapes can be obtained. Further, the divided structure as in the case of the two members facilitates the formation of the surface quality of the sliding contact portion.

  Next, a case of obtaining a fiber bundle forming die made of aluminum oxide ceramic will be described as an example of a method of manufacturing the fiber bundle forming die of the present disclosure. First, aluminum oxide powder as the main component, powders of silicon oxide, zirconium oxide, calcium carbonate and magnesium oxide as sintering aids, a dispersing agent for dispersing aluminum oxide powder if necessary, polyvinyl alcohol etc. The binder is wet mixed by a ball mill or bead mill for 40 to 50 hours to form a slurry.

Here, the average particle size (D ₅₀ ) of the aluminum oxide powder is 0.8 μm or more and 2.2 μm or less, and the content of the silicon oxide powder in a total of 100% by mass of the above powder is 5.5 to 7.5 mass %, The content of zirconium oxide powder is 1.0 to 1.5% by mass, the content of calcium carbonate powder is 2.5 to 3.5% by mass, the content of magnesium oxide powder is 0.5 to 1 It is .0 mass%.

  The slurry is then spray dried to obtain granules. Next, the granules are filled into a mold, and a columnar compact is obtained using a hydrostatic pressure apparatus or a uniaxial pressure apparatus, for example, at a molding pressure of 80 MPa or more and 120 MPa or less. Then, after forming the columnar shaped body into a cylindrical shaped body by cutting, the sintering temperature is set to 1500 ° C. or more and 1700 ° C. or less, and held for 1 hour or more and 3 hours or less to obtain a cylindrical sintered body . In order to obtain a fiber bundle forming die having an arithmetic average roughness Ra of 0.5 μm or more and 1.5 μm or less, the inner circumferential surface of the sintered body can be made according to JIS R 6001-2: 2017. The honing process may be performed using a diamond abrasive having a grain size number of # 600 to # 1200 as defined in 1.

Also, to obtain a fiber bundle forming die in which the sliding contact portion is made of aluminum oxide ceramic, the relative density is 95% or more, and the average crystal grain size of the aluminum oxide crystal is 5 μm or less, aluminum oxide powder The average particle diameter (D ₅₀ ) of the above may be 1.5 μm or less, and the firing temperature may be maintained at 1600 ° C. or more and 1700 ° C. or less for 1 hour or more and 3 hours or less.

  Next, as another example, the case of obtaining a fiber bundle forming die made of a zirconium oxide-based ceramic will be described. First, a zirconium oxide powder as a main component, a magnesium oxide powder as a stabilizer, a dispersant for dispersing aluminum oxide powder if necessary, and a binder such as polyvinyl alcohol are wet for 40 to 50 hours by a ball mill or bead mill Mix to make a slurry.

Here, the average particle size (D ₅₀ ) of the zirconium oxide powder is 0.8 μm or more and 2.2 μm or less, and the content of the magnesium oxide powder in a total of 100% by mass of the above powder is 2.0 to 4.0 It is mass%. And about the process after spray-drying a slurry and obtaining a granule, it is for fiber bundle formation which consists of a zirconium oxide-type ceramics by passing through the process mentioned above except making calcination temperature into 1600 ° C or more and 1700 ° C or less. You can get a dice.

  Next, as an example in which the tubular member which is a fiber bundle forming die is a bonded body in which the bonding layer is positioned along the axial direction of the through hole, first, the cross section in the axial direction of the through hole is semicircular Two members having a recess are produced, a brazing material or a bonding material is applied to at least one of the contact surfaces of the two members, and the two members are brought into contact and then heat treated to form the above joined body. A fiber bundle forming die can be obtained. Although the example which consists of two members was mentioned as an example of a joined object, it can not be overemphasized that it may consist of three or more members.

  Further, as an example in which only the sliding contact portion is made of ceramics, if a film made of aluminum oxide ceramic or the like is coated on the inner peripheral surface of a cylindrical member made of a material other than ceramics by a method such as PVD or CVD. Good. In addition, in order to make arithmetic mean roughness Ra of the surface of a sliding contact part into 0.5 micrometer or more and 1.5 micrometers or less, arithmetic mean roughness Ra of the inner peripheral surface in front of covering is made into 0.7 micrometer or more and 1.7 micrometers or less It may be coated thereon by a method such as PVD or CVD.

  As mentioned above, although the fiber bundle forming die of the embodiment according to the present disclosure has been illustrated, the present disclosure is not limited to the above-described embodiment, and may be arbitrary without departing from the scope of the present disclosure. Needless to say.

DESCRIPTION OF SYMBOLS 1 Die for fiber bundle primary molding 2 Die for fiber bundle secondary molding 3 Resin liquid tank 4 Microwave heating device 5 Heating device 6 Cutting part 7 Fiber bundle 10 Fiber supply body manufacturing device

Claims (5)

It is a cylindrical member having a sliding contact portion with fibers on the inner circumferential surface,
The sliding portion is made of any of titanium carbide based ceramics, titanium carbonitride based ceramics, titanium nitride based ceramics, aluminum oxide based ceramics, zirconium oxide based ceramics, aluminum oxide and zirconium oxide composite ceramics,
A fiber bundle molding die, wherein the arithmetic mean roughness Ra of the surface of the sliding contact portion is 0.5 μm or more and 1.5 μm or less.   The fiber bundle molding die according to claim 1, wherein the sliding contact portion is made of an aluminum oxide ceramic, the relative density is 95% or more, and the average crystal grain size of the aluminum oxide crystal is 5 μm or less.   The fiber bundle molding die according to claim 1 or 2, wherein the sliding contact portion has an average value of skewness Rsk on the surface of -1 or more and 1 or less.   4. The method according to claim 1, wherein the cylindrical member including the sliding contact portion is made of any one of an aluminum oxide ceramic, a zirconium oxide ceramic, or a composite ceramic of aluminum oxide and zirconium oxide. The fiber bundle forming die according to The fiber bundle molding die according to any one of claims 1 to 4, wherein the cylindrical member is a bonded body in which a bonding layer is positioned along the axial direction of the through hole.

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