CN115717275A - Fiber guide and method for manufacturing same - Google Patents

Abstract

Provided are a guide for fibers and a method for manufacturing the same, wherein friction generated on a sliding wire is uniform on the whole sliding surface. The guide (1) for fiber guides the yarn (Y) moving in one direction along the extending direction in a state of bundling a plurality of yarns after spinning. The guide (1) for fiber has a main body (2) composed of a sintered body, and the main body (2) has a sliding surface (5) on which a part of the filament (Y) in the moving direction slides. The sliding surface (5) has an irregular shape (10) on the surface thereof, which is smaller than the yarn (Y), and the irregular shape (10) is configured such that a contact surface (11) including a contact portion (11 a) that comes into contact with the yarn (Y) and a recessed portion (12) that is recessed from the contact surface (11) by cutting the sliding surface (5) are alternately and continuously arranged in a regular pattern, and the height positions of the contact surfaces (11) are aligned.

Description

Fiber guide and method for manufacturing same

Technical Field

The present invention relates to a guide for fiber and a method for manufacturing the same.

Background

Conventionally, in a process of manufacturing synthetic fibers, a fiber guide for guiding and conveying a yarn is used. The sliding surface of the fiber guide in contact with the yarn is subjected to various surface treatments in order to suppress damage to the yarn due to friction.

For example, patent document 1 discloses an Oiling nozzle (Oiling nozzle) for adhering oil to a yarn to be spun. The upper nozzle is made of ceramic and has a structure in which oil is accumulated in minute grooves provided on the sliding surface of the yarn path groove. This stably applies oil to the yarn, and suppresses friction generated between the yarn and the sliding surface.

The ceramic fiber guide is subjected to various surface finishes (surface finishes) on the fired molded body according to the process used. For example, the fired compact is heat-treated in a high-temperature furnace to raise crystals and form a pearskin pattern. Since the surface of the fiber guide is formed with minute irregularities with respect to the yarn by the heat treatment, the area of contact between the sliding surface and the yarn is reduced, and friction generated when the yarn slides can be suppressed.

Documents of the prior art

Patent literature

Patent document 1: japanese patent laid-open publication No. 2005-68608

Disclosure of Invention

Problems to be solved by the invention

However, in the heat treatment process, advanced control of heat flow is required to adjust the shape and size of the irregularities. Further, it is difficult to make the heat distribution in the high-temperature furnace uniform, and individual differences occur in the shape of minute irregularities depending on the shape of the molded body and the arrangement position in the furnace. Thus, although the surface processed into the pearskin pattern has an advantage of reducing the sliding friction, the degree of reduction of the friction may vary due to the irregular uneven shape. This causes variation in yarn quality due to the fiber guide used, and therefore, a fiber guide having uniform sliding friction over the entire sliding surface is required.

The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a guide for fiber and a method of manufacturing the guide for fiber, in which friction generated in a sliding wire is uniformly reduced over the entire sliding surface.

Means for solving the problems

In order to solve the above problems, the present invention adopts the following method. First, a first aspect of the present invention is a guide for fiber for guiding a plurality of filaments that move in one direction in an extending direction in a state where the filaments are bundled after spinning, the guide for fiber comprising a body made of a sintered body, the body having a sliding surface on which a part of the filaments that are moving in the extending direction slides, the sliding surface having on a surface thereof a concave-convex shape that is smaller than the filaments, the concave-convex shape being configured such that a contact surface including a contact portion that contacts with the filaments and a concave portion that is recessed from the sliding surface by being cut are alternately and continuously arranged regularly, and the contact surfaces are aligned in height position.

According to the first aspect of the invention, the sliding surface of the fiber guide is formed with the fine and regular uneven shape with respect to the yarn, and the contact surface of the sliding surface has the flat surface shape as a whole with the height position thereof aligned. Thus, the contact portions with which the wires come into contact are aligned in height, and the friction against the wires is uniformly reduced over the entire sliding surface. Further, if the friction with the yarn becomes uniform, the quality of the produced yarn can be stabilized.

A second aspect of the invention provides the guide for fiber of the first aspect of the invention, wherein the sliding surface has the contact surface having a curved surface shape.

According to the second aspect of the invention, the yarn slides while being in contact with the smooth contact surface having the curved surface shape, and therefore, hooking of the yarn is suppressed, and friction against the yarn is reduced.

A third aspect of the invention is the guide for fiber according to the first or second aspect of the invention, wherein the contact surface is rounded when the sliding surface is viewed from the front.

According to the third aspect of the invention, hooking of the sliding yarn can be further suppressed, and friction against the yarn can be reduced.

A fourth aspect of the invention provides the guide for fiber according to any one of the first to third aspects of the invention, wherein the main body is made of alumina ceramic.

According to the fourth aspect of the present invention, the alumina ceramic is chemically stable and has high mechanical strength, and therefore, the wear resistance of the fiber guide is improved.

A fifth aspect of the present invention is a method for manufacturing a guide for fiber, which guides a plurality of filaments moving in one direction in an extending direction in a state where the filaments are bundled after spinning, the method including: a polishing step of polishing a surface of a body made of a sintered body into a mirror surface state, and a concave-convex forming step of forming a concave-convex shape smaller than the thread on a sliding surface on which a part of the thread in the extending direction is slid during movement; the uneven-surface forming step includes a laser processing step of cutting the sliding surface with a laser, and the uneven shape is formed by regularly, alternately, and continuously arranging a contact portion including a contact portion with the wire and a concave portion recessed with respect to the contact surface, and aligning the height positions of the contact surfaces.

According to the fifth invention, the surface of the sliding surface is laser-cut, and a concavo-convex shape smaller than the wire is formed. The uneven shape is formed such that a contact surface with which the yarn comes into contact and a recessed portion recessed from the contact surface are regularly arranged. In the case of laser processing, processing of a minute surface shape is facilitated as compared with the case of heat treatment processing in a high-temperature furnace, and the same surface shape can be repeatedly reproduced. Therefore, the generation of individual differences in the sliding surface between the products of the guide for fiber can be suppressed, and the yarn quality can be stabilized.

A sixth aspect of the invention provides the method of manufacturing a fiber guide according to the fifth aspect of the invention, wherein the contact surface is formed into a curved surface shape in the uneven shape.

According to the sixth aspect of the invention, a smooth surface shape can be formed on the sliding surface. This can suppress friction against the sliding wire.

A seventh aspect of the invention provides the method for manufacturing a guide for fiber according to the fifth or sixth aspect of the invention, wherein in the uneven shape, the contact surface is formed in a circular shape when the sliding surface is viewed from the front.

According to the seventh aspect of the invention, a smoother surface shape can be formed on the sliding surface. This can further suppress the catching of the sliding yarn and reduce the friction against the yarn.

An eighth aspect of the invention provides the method of manufacturing a fiber guide according to any one of the fifth to seventh aspects of the invention, wherein the uneven forming step includes a heat treatment step of firing the body after the laser processing step.

According to the eighth aspect of the invention, the edge generated at the edge of the recess in the laser processing step is smoothed. This can suppress the hooking of the sliding thread.

A ninth aspect of the invention provides the method of manufacturing a fiber guide according to any one of the fifth to eighth aspects of the invention, wherein the laser processing step uses a UV laser.

According to the ninth aspect of the present invention, the UV laser is suitable for microfabrication, and a stable fine uneven shape can be formed even in a sintered body having coarser particles than metal.

A tenth aspect of the invention provides the method of manufacturing a fiber guide according to any one of the fifth to ninth aspects of the invention, wherein the main body is made of alumina ceramic.

According to the tenth aspect of the present invention, the alumina ceramic is chemically stable and has high mechanical strength, and therefore, the wear resistance of the fiber guide is improved.

ADVANTAGEOUS EFFECTS OF INVENTION

The present invention, having the above-described configurations of the respective inventions, can provide a guide for fiber and a method for manufacturing the guide for fiber, in which friction generated in a sliding wire is uniformly reduced over the entire sliding surface.

Drawings

Fig. 1 is a schematic diagram showing a part of a fiber manufacturing apparatus and a cross section of an Oiling Guide (guiding for fiber).

Fig. 2 is a view showing an arrangement of the concave-convex shape of the first embodiment when viewed from the front.

Fig. 3 is a view showing a cross-sectional shape of the concave-convex shape of the first embodiment.

Fig. 4 is a diagram showing a modification example of the concave-convex shape of the first embodiment.

Fig. 5 is a view showing an arrangement of the concave-convex shape of the second embodiment when viewed from the front.

Fig. 6 is a diagram showing a cross-sectional shape of the concave-convex shape of the second embodiment.

Fig. 7 is a diagram showing a modification example of the concave-convex shape of the second embodiment.

Fig. 8 is a view showing a machined surface of comparative example 1.

Fig. 9 is a view showing a machined surface of example 1.

Fig. 10 is a view showing a machined surface of example 2.

Fig. 11 is a graph showing the roughness of the surface shape of comparative example 1.

Fig. 12 is a graph showing the roughness of the surface shape of example 1.

Fig. 13 is a schematic view of an apparatus for measuring tension applied to a wire.

Fig. 14 is a graph showing the measurement results of the tension applied to the yarn in example 1 and comparative example 1.

Fig. 15 is a diagram showing a scum generation state in comparative example 1.

Fig. 16 is a diagram showing a scum generation state in embodiment 1.

Fig. 17 is a diagram for comparing the state of holding an oil agent on the machined surface in example 1 and comparative examples 1 to 3.

Description of the reference numerals

1: an oil-applying guide (guide for fiber),

2: a main body which is provided with a plurality of grooves,

3: a guide groove is arranged on the upper surface of the guide groove,

4: an ejection port,

5: a sliding surface, which is provided with a sliding surface,

10. 20: the shape of the concave-convex part is,

11. 21: the contact surface is provided with a plurality of contact surfaces,

11a, 21a: the contact position of the contact part is provided with a plurality of contact holes,

12. 22: the concave part is provided with a concave part,

y: the silk thread is provided with a plurality of silk threads,

p1, P2: height position.

Detailed Description

< Structure of guide for fiber (first embodiment) >

First, a first embodiment of the present invention will be explained. The guide for fiber according to the embodiment of the present invention is provided in a fiber manufacturing apparatus for manufacturing synthetic fibers, natural fibers, or the like, and guides the spun yarn Y. Examples of the fiber guide include various guides such as an oiling guide, a snail guide, a Dog tail guide, a hook guide, and a slit guide. As the guide for fiber of the present embodiment, the oiling guide 1 to which an oiling agent for protecting the yarn Y is supplied will be described. As shown in fig. 1, the fiber manufacturing apparatus includes a spinning nozzle 15, an oiling guide 1, a plurality of guides 16, and the like.

The fiber manufacturing apparatus melts a polymer as a fiber raw material and discharges the molten polymer from the spinning nozzle 15 to form a plurality of threads Y, and the threads Y are cooled and solidified. The spun yarn Y is first moved in one direction along the extending direction of the yarn Y in a state where a plurality of yarns are bundled by the oiling guide 1. The oiling guide 1 is configured to attach an oiling agent containing a lubricant to the yarn Y for the purpose of reducing damage to the yarn Y in a subsequent process and improving the aggregation property of the yarn Y while guiding the yarn Y.

The oil guide 1 has a body 2 consisting of a sintered body. The sintered body constituting the main body 2 can be appropriately selected from ceramics, sintered alloys, and the like. Examples of the ceramics include various ceramics such as alumina, zirconia, titania, and silicon carbide. Ceramics have higher hardness than metals, and have heat resistance, wear resistance, oxidation resistance, and corrosion resistance. The sintered alloy may be a cemented carbide or a cermet. The cemented carbide has well-balanced hardness, wear resistance, and toughness. Cermets have properties such as high hardness, heat resistance, and wear resistance of ceramics, and properties such as viscosity and toughness of metals.

In the main body 2 of the oil application guide 1 of the present embodiment, alumina ceramic is selected as the sintered body. Alumina ceramics are preferred because of their high strength and hardness, and their excellent heat resistance, corrosion resistance, abrasion resistance, and electrical insulation properties.

The body 2 of the oil guide 1 has a guide groove 3 guiding the wire Y. The guide groove 3 is formed with the direction of movement of the yarn Y as the longitudinal direction. The wire Y moves in one direction along the guide groove 3. The main body 2 has an ejection port 4 for ejecting the oil agent and a sliding surface 5 on which a part of the running yarn Y slides in the extending direction thereof on the bottom surface of the guide groove 3. A connection pipe 17 is connected to the fitting hole 6 communicating with the discharge port 4, and the oil agent is supplied from a pump 19 via the connection pipe 17 and a conduit 18. Therefore, the yarn Y ejected from the plurality of holes of the spinning nozzle 15 is conveyed toward the oiling guide 1 into the guide groove 3, is bundled into one yarn Y therein, and is moved while being pressed against the sliding surface 5, thereby coming into contact with the finish ejected from the ejection port 4. Thereby, the oil agent adheres to the yarn Y.

With the main body 2 of the oil guide 1, when a face having a depression constituting the guide groove 3 is a front face 2a and a width direction of the guide groove 3 is a left-right direction, the main body 2 is formed in a block shape having both left and right side faces, a rear face 2b, an upper face 2c, and a lower face 2 d. The outer shape is trapezoidal when viewed from the side, and the side surface has a shape in which the front side edge and the rear side edge are parallel to each other, and the upper side edge and the lower side edge thereof are inclined with respect to the front and rear sides. The guide groove 3 extends through the body 2 from the end of the upper surface 2c to the end of the lower surface 2 d.

A plurality of oil reservoirs 7 are provided on the bottom surface of the guide groove 3, and the oil reservoirs 7 are formed in a groove shape that is long in the left-right direction across the guide groove 3. The oil reservoirs 7 have the same shape and are arranged in a row in the moving direction of the yarn Y on the downstream side of the discharge port 4. The arrangement and number of the oil reservoir 7 are arbitrarily set. The oil reservoir 7 is formed by recessing the bottom surface of the guide groove 3 into a groove shape, and can receive excess oil adhering to the yarn Y at the discharge port 4. On the other hand, when the oil agent attached to the yarn Y passing through the oil reservoir 7 is insufficient, the oil agent trapped in the oil reservoir 7 is attached to the yarn Y. In this way, the excess or deficiency of the oil agent adhering to the yarn Y can be adjusted by the oil reservoir 7. The shape of each oil reservoir 7 may be set to be different.

The surface of the sliding surface 5 is laser-processed and has a concave-convex shape 10 finer than the wire Y. Fig. 2 is a schematic view of the surface of the sliding surface 5 as viewed from the front, showing the arrangement of the concave-convex shapes 10. Fig. 3 shows a cross-sectional shape of the concave-convex shape 10. The uneven shape 10 has a convex contact surface 11 including a contact portion 11a that contacts the yarn Y, and a concave portion 12 in which the sliding surface 5 is cut and recessed from the contact surface 11.

As shown in fig. 3, the contact surface 11 and the concave portion 12 are each formed into a curved surface shape so that the cross section of the concave-convex shape 10 has a wave shape repeating a mountain and a valley. The convex portion of the concave-convex shape 10 is formed in a curved shape so that the lower end thereof is expanded from the apex of the peak as the contact surface 11 toward the bottom of the valley as the concave portion 12. Here, a plane continuously passing through a position bisected in the height direction on the half-peak waist connecting the peak of the peak and the lowest point of the valley is defined as a virtual plane Q. In this case, the portion above the virtual plane Q corresponds to the contact surface 11. The contact surface 11 is rounded when the sliding surface 5 is viewed from the front. The yarn Y contacts the contact surface 11 along a height position P1 of the contact surface 11. A portion recessed in a curved surface shape between the contact surface 11 and the contact surface 11, that is, a portion located below the virtual plane Q corresponds to the recessed portion 12.

As shown in fig. 3, the contact surfaces 11 and the concave portions 12 are regularly, alternately and continuously arranged. In fig. 2, circles arranged indicate the peaks and valleys of the uneven shape 10, that is, the contact surface 11 and the recessed portion 12. The size and arrangement interval of the contact surface 11 and the concave portion 12 in the concave-convex shape 10 are set by determining the size of the circle. The direction of the sliding surface 5 will be described as the vertical direction and the horizontal direction shown in fig. 2.

The concave-convex shape 10 is in accordance with the arrangement of circles shown in fig. 2, and the contact surface 11 and the concave portion 12 are arranged at equal intervals. Specifically, the concave portions 12 are arranged at equal intervals L1 in the left-right direction, and the contact surface 11 is arranged between the concave portions 12 and the concave portions 12. Further, the contact surface 11 and the concave portion 12 are arranged continuously at equal intervals L2 in the vertical direction. The depth H1 of the recess 12 (height difference between the contact portion 11a and the bottom of the recess 12) is arbitrarily set. The concave-convex shape 10 may be formed by making the recesses 12 all have the same depth H1 as shown in fig. 3, or may be formed by making the recesses 12a and 12b regularly have different depths H2 and H3 as shown in fig. 4. The respective projected height positions P1 of the contact faces 11 are aligned.

< Structure of guide for fiber (second embodiment) >

Next, the oiling guide 1 (guide for fiber) of the second embodiment will be explained. Note that the description of the common structure with the first embodiment is omitted, and the different structure will be described. Fig. 5 is a front view of the surface of the sliding surface 5 of the main body 2. Fig. 6 shows a cross-sectional shape of the concave-convex shape 20. As shown in fig. 5 and 6, the surface of the sliding surface 5 is subjected to a hole-forming process by a laser beam, and has minute irregularities 20. The uneven shape 20 has a contact surface 21 including a contact portion 21a that contacts the yarn Y and a recessed portion 22 in which the sliding surface 5 is cut so as to be recessed from the contact surface 21.

The contact surfaces 21 and the concave portions 22 are arranged alternately and continuously in the vertical direction and the horizontal direction. Specifically, a plurality of circular holes are provided at equal intervals L3 in the vertical direction and the horizontal direction as the recessed portions 22 when viewed from the front of the sliding surface 5. Between the recess 22 and the recess 22, a portion of the surface of the sliding surface 5 left uncut corresponds to the contact surface 21. The height position P2 of the contact face 21 is aligned. The yarn Y contacts the contact surface 21 at a height position P2 of the contact surface 21.

The concave portion 22 is formed in a curved surface shape. Further, the body 2 is subjected to a heat treatment after the hole forming process by the laser beam, and the edge of the recess 22 formed by the hole forming process is removed. Thus, the uneven shape 20 is formed in a smooth state without fine protrusions or the like at the boundary between the concave portion 22 and the contact surface 21. The size, depth (difference in height from the contact surface 21), arrangement interval, and the like of the concave portion 22 are arbitrarily set. For example, as shown in fig. 6, the concave portions 22 having the same depth H4 may be provided, or as shown in fig. 7, the concave portions 22a and 22b having different depths H5 and H6 may be provided.

< Process for producing guide for fiber (first embodiment) > (first embodiment)

Next, a manufacturing process of the oiling guide 1 (guide for fiber) of the above embodiment will be explained. In the process for producing the upper oil guide 1 according to the first embodiment, a molded body of the main body 2 of the upper oil guide 1 is molded using an inorganic solid powder or the like which is a raw material of alumina ceramics. Referring to fig. 1, the body 2 is shaped like a block having a recess. Specifically, the front surface 2a of the main body 2 is recessed in the moving direction of the yarn Y, forming the guide groove 3. The guide groove 3 extends through the body 2 from the end of the upper surface 2c to the end of the lower surface 2 d.

The guide groove 3 has a sliding surface 5 on the bottom surface thereof on which the yarn Y slides. An ejection port 4 for ejecting the oil is provided on the upstream side of the bottom surface of the guide groove 3, and a plurality of depressions are provided as oil reservoirs 7 on the downstream side. The oil reservoir 7 is formed in a groove shape extending in the left-right direction (the width direction of the guide groove 3) across the guide groove 3, and is arranged in parallel in the moving direction of the yarn Y (the longitudinal direction of the guide groove 3). Further, the body 2 is provided with a fitting hole 6 communicating with the ejection port 4. The compact of the main body 2 is fired by a known firing method to form a sintered body of alumina ceramic.

The manufacturing process of the oil guide 1 includes a grinding process and a concave-convex forming process. In the polishing step, polishing is performed on the surface of the fired body 2. The polishing process is, for example, a barrel polishing and then a mirror polishing. Mirror polishing uses an abrasive such as diamond. In the polishing step, the surface of the body 2 is finished to a mirror surface state by removing the irregularities as much as possible.

The unevenness forming step is performed after the polishing step, and an unevenness 10 finer than the yarn Y is formed on the sliding surface 5 of the guide groove 3 provided in the main body 2. Specifically, the surface of the sliding surface 5 aligned flat in the polishing step is subjected to laser processing (laser processing step) in which cutting is performed by a laser beam. Through this step, as shown in fig. 3, the uneven shape 10 is formed, and the uneven shape 10 has a convex contact surface 11 including a contact portion 11a that comes into contact with the sliding yarn Y and a concave portion 12 that is recessed from the contact surface 11.

The contact surface 11 and the concave portion 12 are formed into a curved surface shape so that the cross section of the concave-convex shape 10 has a wave shape repeating hills and valleys. The convex portion of the concave-convex shape 10 is formed in a curved shape so that the lower end is expanded from the peak of the peak as the contact surface 11 toward the bottom of the valley as the concave portion 12. A plane continuously passing through a position bisected in the height direction on the half-peak waist connecting the peak of the peak and the lowest point of the valley is defined as a virtual plane Q, and in this case, a portion above the virtual plane Q corresponds to the contact surface 11. The contact surface 11 is shaped to be circular when the sliding surface 5 is viewed from the front. A portion recessed in a curved surface shape between the contact surface 11 and the contact surface 11, that is, a portion located below the virtual plane Q corresponds to the recessed portion 12.

The contact surfaces 11 and the concave portions 12 are regularly alternately and continuously arranged. Circles arranged in fig. 2 indicate peaks and valleys of the uneven shape 10, that is, the contact surface 11 and the recessed portion 12 when the sliding surface 5 is viewed from the front. The concave-convex shape 10 composed of the contact surface 11 and the concave portion 12 is formed in accordance with the arrangement of the circles. The center of the circle and the periphery thereof correspond to the contact portion 11a of the contact surface 11 or the bottom of the recess 12. By determining the size of the circle, the size and the arrangement interval of the contact surface 11 and the concave portion 12 of the concave-convex shape 10 are set.

In the concave-convex shape 10 formed by cutting the surface of the sliding surface 5, the concave portions 12 are disposed so that the bottoms of the concave portions 12 are at equal intervals L1 in the left-right direction, and the contact surfaces 11 are disposed between the concave portions 12 and the concave portions 12. Further, the contact surface 11 and the concave portion 12 are arranged continuously at equal intervals L2 in the vertical direction. In this way, the sliding surface 5 is machined to a uniform surface state.

The depth of the recess 12 (the height difference between the contact portion 11a and the bottom of the recess 12) is set arbitrarily. As shown in fig. 3, the concave-convex shapes 10 are formed so that all the concave portions 12 have the same depth H1. The respective projected height positions P1 of the contact faces 11 are aligned. Instead of the recesses 12 having the same depth H1, the recesses 12a and 12b may be regularly formed to have different depths H2 and H3 as shown in fig. 4.

The laser used in the laser processing step can be selected as appropriate. For example, a femtosecond laser, a UV laser (UV laser) or the like can perform fine processing with a hole diameter and a processing width of 100 μm, and can form a fine uneven shape 10 on the sliding surface 5. Since ceramics have a larger particle size than metals and damage by collision of laser light with them may cause minute surface roughness, a UV laser having a shorter wavelength is more preferable. In the case of the UV laser, the laser light is absorbed as heat and is brought into a surface state like being melted, and thus smoother surface processing can be performed. This can reduce friction against the running yarn Y.

< Process for producing guide for fiber (second embodiment) >

The manufacturing process of the oiling guide 1 according to the second embodiment includes a polishing process and a concave-convex forming process. The polishing step is substantially the same as that of the first embodiment, and therefore, description thereof is omitted.

The concave-convex forming process of the oil guide 1 according to the second embodiment will be described. After the polishing step, in the uneven forming step, an uneven pattern 20 finer than the yarn Y is formed on the sliding surface 5 of the guide groove 3 provided in the main body 2. Specifically, the surface of the sliding surface 5 aligned flat in the polishing step is subjected to drilling using a laser, and as shown in fig. 6, a recessed portion 22 is formed in which the surface of the sliding surface 5 is cut and recessed. As shown in fig. 5, the concave portions 22 are circular holes in front view, and are arranged at equal intervals L3 in the vertical direction and the horizontal direction. Between each of the recesses 22 and 22, a contact surface 21 including a contact portion 21a with the sliding yarn Y is formed. In this way, the concave-convex shapes 20 in which the contact surfaces 21 and the concave portions 22 are regularly and alternately arranged in series are formed on the sliding surface 5. The step of cutting the sliding surface 5 with a laser beam and drilling the hole in the concave-convex forming step corresponds to the "laser processing step" of the present invention.

As shown in fig. 6, the concave portion 22 is formed in a curved surface shape. The size, depth (height difference from the contact surface 21), arrangement interval, and the like of the concave portion 22 are arbitrarily set. For example, the recesses 22 formed in the sliding surface 5 may all be formed to the same depth H4. The recesses 22a and 22b may be formed to different depths H5 and H6 (see fig. 7). The contact surface 21 is formed by a portion of the surface of the sliding surface 5 left uncut, and the height position P2 is aligned. The laser used in the laser processing step can be selected as appropriate, and a UV laser is preferable as in the first embodiment.

The uneven forming step includes a heat treatment step of firing the main body 2 after the laser processing step. In the heat treatment step, the body 2 is fired again. When the ceramic is fired again in this manner, crystal growth on the surface is caused, and the edge generated at the edge of the recess 22 by the hole forming process is smoothed. Accordingly, the uneven shape 20 is formed in a smooth state without minute projections or the like at the boundary between the concave portion 22 and the contact surface 21.

< action and Effect >

As shown in fig. 1, when the oiling guide 1 (guide for fiber) of the above embodiment is provided in the moving direction of the spun yarn Y, the yarn Y moves in the downstream direction through the guide groove 3 of the oiling guide 1. Specifically, the yarn Y ejected from the plurality of holes of the spinning nozzle 15 is sent to the oiling guide 1, bundled into one yarn Y in the guide groove 3, and moved while being pressed against the sliding surface 5. The oil agent is supplied from the ejection port 4 of the oiling guide 1 and adheres to the yarn Y. The yarn Y slides while contacting the contact surfaces 11 and 21 of the sliding surface 5. By processing the sliding surface 5 into the fine uneven shapes 10, 20, the areas of the contact surfaces 11, 21 become smaller, and friction against the sliding yarn Y can be suppressed. The recesses 12, 12a, 12b, 22a, and 22b have a function of holding the oil agent, and the oil agent can be stably attached to the yarn Y without causing a shortage.

In the oil guide 1 according to the first and second embodiments, the sliding surface 5 is formed with the irregular shapes 10 and 20 having a minute and regular pattern with respect to the yarn Y. The sliding surface 5 has an overall smooth surface shape in which the height positions P1, P2 of the contact surfaces 11, 21 are aligned. Thus, the contact portions 11a and 21a contacted by the yarn Y are aligned in height position, and the friction against the yarn Y is uniformly reduced over the sliding surface 5. Further, if the friction against the yarn Y becomes uniform, the quality of the produced yarn can be stabilized.

In the oil guides 1 of the first and second embodiments, the oil agent adhering to the yarn Y remains on the sliding surface 5 in the recesses 12, 12a, 12b, 22a, 22b of the fine uneven shapes 10, 20, and the oil agent retaining function is improved. Further, since the irregularities 10 and 20 have regularity, the oil agent can be uniformly held.

The body 2 of the oil applying guide 1 of the first and second embodiments is made of alumina ceramics. The alumina ceramics are chemically stable and mechanically strong, and therefore the wear resistance of the oil guide 1 is improved.

The sliding surface 5 of the oil guide 1 of the first embodiment has a curved contact surface 11. Since the yarn Y slides while being in contact with the smooth contact surface 11, friction against the yarn Y is reduced. The contact surface 11 is rounded when the sliding surface 5 is viewed from the front. This further suppresses the hooking of the sliding yarn Y, and reduces the friction against the yarn Y.

The sliding surface 5 of the oil guide 1 according to the second embodiment has circular recesses 22, 22a, 22b when viewed from the front. Thus, the recessed portions 22, 22a, 22b having no corner when the sliding surface 5 is viewed from the front are arranged. Therefore, the hooking of the yarn Y at the boundaries between the contact surface 21 and the recesses 22, 22a, and 22b is suppressed.

According to the manufacturing process of the oil application guide 1 (fiber guide) of the first and second embodiments, the surface of the sliding surface 5 is laser-cut, and the irregularities 10 and 20 finer than the yarn Y are formed. In the uneven shapes 10, 20, the contact surfaces 11, 21 and the recesses 12, 12a, 12b, 22a, 22b with which the yarn Y comes into contact are regularly arranged. In the case of laser processing, processing of a minute surface shape is easier than in the case of heat treatment processing in a high-temperature furnace, and the same surface shape can be repeatedly reproduced. Therefore, it is possible to suppress the occurrence of individual differences in the surface shape of the sliding surface 5 between products of the oiling guide 1, and to stabilize the yarn quality.

In the oil guide 1 according to the first and second embodiments, the sliding surface 5 is subjected to laser processing. By performing the surface treatment by the laser processing, the time for the heat treatment can be significantly reduced as compared with, for example, the pearskin texture processing (see fig. 8) by the conventional heat treatment. Further, energy consumption due to the use of a high-temperature furnace is also suppressed, contributing to reduction of carbon dioxide emission. In addition, when a laser is used, the shape pattern and size of the unevenness can be set according to the use application, and a minute surface shape can be formed according to the design. Since the laser processing can control the minute surface processing in this way, by appropriately setting the shape, arrangement, and the like of the irregularities, it is possible to form a surface shape having a lower friction and a high retention function of the oil agent.

In the laser processing steps of the first and second embodiments, a UV laser is used. The UV laser is suitable for microfabrication, and can form a stable fine uneven shape even for ceramics having coarser particles than metal.

In the oiling guide 1 according to the first and second embodiments, the surface of the sliding surface 5 which is in a mirror-surface state in the polishing step is subjected to laser processing. Since the light output by the laser processing control melts and evaporates the irradiated portion in a non-contact manner with respect to the processing surface, the laser output distance to the processing surface can be further accurately obtained by aligning the surface of the sliding surface 5 irradiated with the laser, that is, the processing surface in a flat manner. This enables the formation of the uneven shapes 10 and 20 with high accuracy.

In the process of manufacturing the oiling guide 1 according to the first embodiment, the contact surface 11 of the uneven shape 10 is formed into a curved surface shape. Further, the contact surface 11 is formed in a circular shape when the sliding surface 5 is viewed from the front. This enables a smooth surface shape to be formed on the sliding surface 5. This suppresses hooking of the sliding yarn Y, and reduces friction against the yarn Y.

In the manufacturing process of the oil guide 1 according to the second embodiment, the recesses 22, 22a, and 22b of the uneven structure 20 are formed in a circular shape when viewed from the front of the sliding surface 5. This arrangement allows the concave portions 22, 22a, and 22b to be formed into a smooth surface shape without having any corners when the sliding surface 5 is viewed from the front. This suppresses hooking of the yarn Y at the boundaries between the contact surface 21 and the recesses 22, 22a, and 22b.

In the manufacturing process of the oiling guide 1 according to the second embodiment, the uneven forming process is a heat treatment process of firing the body 2 after the laser processing process. By re-firing the body 2 made of ceramic, the edges generated at the edges of the recesses 22, 22a, 22b in the laser processing step become smooth. This suppresses hooking of the sliding yarn Y.

The present invention will be specifically described below with reference to examples and comparative examples.

[ example 1]

The main body 2 of the oil application guide 1 (guide for fiber) made of alumina ceramic (sintered body) was barrel-polished and then mirror-polished. The mirror-surface is processed by forming fine irregularities using a UV laser. The surface is formed in a wave shape in which peaks and valleys are repeated, and the contact surfaces 31 and the concave portions 32 are regularly and alternately arranged in series (see fig. 9 and 12).

[ example 2]

The main body 2 made of alumina ceramic was barrel polished and then mirror polished. The surface in the mirror state is processed by forming a plurality of minute holes using a UV laser. Thereafter, a conventional heat treatment is performed. The holes (concave portions 33) having a circular shape in a front view are regularly arranged. The recess 33 and the recess 33 form a contact surface 34 (see fig. 10).

Comparative example 1

The main body 2 made of alumina ceramic was barrel polished and then mirror polished. The surface is subjected to heat treatment (re-firing) to form pearskin lines by raising crystals (see fig. 8 and 11).

Comparative example 2

The main body 2 made of alumina ceramic was barrel polished and then mirror polished.

Comparative example 3

The main body 2 made of alumina ceramic was barrel-polished. No subsequent surface processing was performed.

< roughness of surface >

Fig. 11 and 12 are diagrams showing characteristics of the roughness charts of the surfaces in the surface finishing of comparative example 1 and example 1. In comparison with comparative example 1 (see fig. 11) in which the pearskin lines were formed by the conventional heat treatment, the surface (see fig. 12) subjected to the UV laser processing as in example 1 had a stable uneven shape and a stable size, and a low-friction surface state was obtained.

< about the amount of generation of tension and dross >

As shown in fig. 13, the yarn Y fed from the yarn package 40 is run on the oiling guide 1 (fiber guide) of example 1 and comparative example 1. The tension T1 on the entry side 41 (upstream in the direction of travel) and the tension T2 on the exit side 42 (downstream in the direction of travel) of the upper oil guide 1 are measured. When the yarn Y runs on the sliding surface of the oiling guide 1, a mixture of the oil agent of the yarn Y and the dross of the yarn Y, which is supposed to be cut off by the fine irregularities of the surface, adheres as dross S. Fig. 14 is a graph showing the measurement results of the tensions T1 and T2 and the amount of scum generation. Fig. 15 shows a generation state of the dross S in the comparative example 1, and fig. 16 shows a generation state of the dross S in the example 1. The difference (T2-T1) between the upstream and downstream tensions of the oiling guide 1 of example 1 is smaller than that of comparative example 1, and the generation of the scum S is reduced, thereby suppressing the friction with the yarn Y.

< oil-retaining function >

The rod-shaped alumina ceramics subjected to the surface finishing of example 1 and comparative examples 1 to 3 were each Dip-coated with a colored oil (Dip coating). After that, the plate was left in the atmosphere for a certain period of time, and the passage of change in the oil agent adhering to the surface was observed. FIG. 17 is a view showing the state of retention of an oil agent on the respective surfaces (A: example 1, B: comparative example 1, C: comparative example 2, and D: comparative example 3). In example 1, a thin and uniform oil film F was formed on the surface, as compared with comparative examples 1 to 3. In this way, the oil agent was uniformly distributed and adhered to the surface of the alumina ceramic by the surface finishing in example 1. That is, a sliding surface having a higher oil retaining function can be obtained. This suppresses friction with the sliding wire, thereby reducing wear of the wire.

< Change example >

The guide for fiber and the method for manufacturing the same according to the present invention are not limited to the appearance and structure described in the first and second embodiments, and can be implemented in various other embodiments by performing various combinations of modifications, additions, deletions, and structures without changing the gist of the present invention.

The "fiber guide" according to the present invention is described by way of example of the upper oil guide 1, but the present invention is not limited to this, and includes various other fiber guides such as a snail guide, a dog tail guide, a hook guide, and a slit guide. The oil application guide 1 is not limited to the shape of the above embodiment, and other shapes can be applied. The sintered body constituting the main body of the fiber guide is not limited to alumina ceramics, and ceramics of other materials, cemented alloys such as cemented carbide and cermet, and the like can be appropriately selected and used.

The shape of the irregularities on the sliding surface is not limited to the above-described embodiment, and other configurations such as a configuration in which hemispheres are continuously arranged as contact surfaces including contact portions, and a configuration in which contact surfaces having a curved surface shape and recesses having a circular shape in front view are alternately arranged can be employed. The shape of the recess 22 when viewed from the front is not limited to a circular shape, and may be changed to another shape as appropriate.

Claims (10)

1. A guide for fiber for guiding a plurality of filaments moving in one direction in an extending direction in a state where the filaments are bundled after spinning, characterized in that,

has a main body composed of a sintered body,

the main body has a sliding surface on which a part of the thread in the running direction slides,

the sliding surface has a concavo-convex shape smaller than the thread on the surface thereof,

the uneven shape is configured such that a contact surface including a contact portion with the wire and a recessed portion, which is recessed from the contact surface by cutting the sliding surface, are alternately and continuously arranged in a regular pattern, and the contact surfaces are aligned in height.

2. The guide for fibers according to claim 1,

the sliding surface has the contact surface in a curved shape.

3. The guide for fiber according to claim 1 or 2,

the contact surface is rounded when the sliding surface is viewed from the front.

4. The guide for fiber according to claim 1 or 2,

the body is composed of an alumina ceramic.

5. A method of manufacturing a guide for fiber that guides a plurality of filaments that move in one direction in an extending direction in a state where the filaments are bundled after spinning, the method comprising:

a polishing step of polishing the surface of the body composed of the sintered body to a mirror surface state, an

A concave-convex forming step of forming a concave-convex shape smaller than the yarn on a sliding surface on which a part of the yarn in the running direction slides in the moving process in the main body;

the concavo-convex forming process includes a laser processing process of cutting the sliding surface by a laser,

the uneven shape is configured such that a contact portion including a contact portion with the yarn and a recessed portion recessed with respect to the contact surface are alternately and continuously arranged regularly, and the height positions of the contact surfaces are aligned.

6. The method of manufacturing a guide for fiber according to claim 5,

in the concave-convex shape, the contact surface is formed into a curved surface shape.

7. The method of manufacturing a guide for fibers according to claim 5 or 6,

in the concave-convex shape, the contact surface is formed in a circular shape when the sliding surface is viewed from the front.

8. The method of manufacturing a guide for fibers according to claim 5 or 6,

the uneven forming step includes a heat treatment step of firing the body after the laser processing step.

9. The method of manufacturing a guide for fibers according to claim 5 or 6,

the laser processing process uses a UV laser.

10. The method of manufacturing a guide for fiber according to claim 5 or 6,

the body is composed of an alumina ceramic.

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