JP2023030827A - Fiber guide and manufacturing method thereof - Google Patents

Abstract

To provide a fiber guide allowing friction occurring on a sliding yarn to be even on the whole sliding surface and a manufacturing method thereof.SOLUTION: A fiber guide 1 guides a yarn Y moving in one direction along an extending direction in a state where a plurality of yarns are bundled after being spun. The fiber guide 1 has a body 2 consisting of sintered body. The body 2 has a sliding surface 5 on which a portion of the yarn Y during moving in the extending direction slides. The sliding surface 5 has an uneven shape 10 finer than the yarn Y on the surface thereof. A contact surface 11 including a contact portion 11a contacting the yarn Y and a concavity 12 that is formed by shaving the sliding surface 5 so as to be dented from the contact surface 11 are continuously and alternately disposed with regularity on the uneven shape 10. Height positions of contact surfaces 11 are aligned.SELECTED DRAWING: Figure 3

Description

TECHNICAL FIELD The present invention relates to a fiber guide and a manufacturing method thereof.

Conventionally, in the manufacturing process of synthetic fibers, fiber guides are used to guide and feed yarns. The sliding surface where the fiber guide and the yarn come into contact is subjected to various surface treatments in order to suppress damage to the yarn due to friction.

For example, Patent Literature 1 discloses an oiling nozzle that applies oil to a spun yarn. This oiling nozzle is made of ceramics, and has a structure in which oil is accumulated in fine grooves provided on the sliding surface of the thread guide groove. As a result, the oil is stably applied to the thread, and the friction between the thread and the sliding surface is suppressed.

In addition, ceramic fiber guides are subjected to various surface finishes on the sintered body depending on the process used. For example, by heat-treating the fired molded body in a high-temperature furnace, crystals are raised to form a pear-skinned surface. Due to this heat treatment, fine irregularities are formed on the surface of the fiber guide with respect to the yarn, so the contact area between the sliding surface and the yarn is reduced, and the friction that occurs when the yarn slides is suppressed. .

Japanese Patent Application Laid-Open No. 2005-68608

However, in order to adjust the shape and size of the unevenness in the heat treatment process, advanced heat flow control is required. In addition, it is difficult to make the heat distribution in the high-temperature furnace uniform, and there are individual differences in the shape of fine irregularities depending on the shape of the compact and the arrangement position in the furnace. Thus, although the surface processed to have a satin finish has the advantage of reducing the sliding friction, there is a concern that the degree of friction reduction may vary due to the irregular irregular shape. Since this causes variations in yarn quality depending on the fiber guide used, there has been a demand for a fiber guide in which the sliding friction is uniform over the entire sliding surface.

The present invention has been invented in view of these points, and the problem to be solved by the present invention is to solve the problem that the friction generated in the sliding yarn is uniformly reduced over the entire sliding surface. The purpose of the present invention is to provide a guide for use in a vehicle and a method for manufacturing the same.

In order to solve the above problems, the present invention takes the following measures. First, a first invention is a fiber guide that guides a plurality of yarns bundled after spinning and moving in one direction along the extending direction, the fiber guide comprising a main body made of a sintered body. the main body has a sliding surface on which a portion of the thread in the extending direction slides during movement, the sliding surface having a finer uneven shape than the thread, In the uneven shape, a contact surface including a contact portion in contact with the yarn and a concave portion recessed from the contact surface by scraping the sliding surface are arranged alternately and continuously with regularity, The height positions of the contact surfaces are aligned.

According to the first invention, on the sliding surface of the fiber guide, fine and regular irregularities are formed with respect to the thread, and the sliding surface has a height position of the contact surface. It has a uniform, generally smooth surface. Therefore, the height positions of the contact portions with which the yarn contacts are aligned, and the friction against the yarn is uniformly reduced over the entire sliding surface. Also, if the friction on the yarn becomes uniform, the quality of the produced yarn can be stabilized.

A second invention is the fiber guide according to the first invention, wherein the sliding surface has the curved contact surface.

According to the second aspect of the invention, since the thread slides while being in contact with the curved smooth contact surface, the thread is prevented from being caught and the friction to the thread is reduced.

A third invention is the fiber guide according to the first or second invention, wherein the contact surface has a circular shape when the sliding surface is viewed from the front.

According to the third invention, the catching of the sliding yarn is further suppressed, and the friction to the yarn is reduced.

A fourth invention is the fiber guide according to any one of the first to third inventions, wherein the main body is made of alumina ceramics.

According to the fourth aspect of the invention, the alumina ceramics are chemically stable and have high mechanical strength, so that the abrasion resistance of the fiber guide is improved.

A fifth aspect of the present invention is a method for manufacturing a fiber guide for guiding a plurality of yarns bundled after spinning and moving in one direction along the extending direction, wherein the surface of the main body made of a sintered body a polishing step of polishing to a mirror-like state; and a concave-convex forming step of forming a finer concave-convex shape than the thread on a sliding surface of the main body on which a part of the thread slides in the extending direction during movement. and the uneven forming step includes a laser processing step of cutting the sliding surface with a laser, and the uneven shape includes a contact surface including a contact portion in contact with the thread and a recess recessed with respect to the contact surface. are alternately and continuously arranged with regularity, and the height positions of the contact surfaces are aligned.

According to the fifth aspect of the invention, the surface of the sliding surface is shaved with a laser to form a fine uneven shape from the thread. In the irregular shape, the contact surface with which the yarn contacts and the concave portion recessed from the contact surface are arranged with regularity. With laser processing, it is easier to process fine surface shapes than in the case of heat treatment in a high-temperature furnace, and the same surface shape can be reproduced repeatedly. Therefore, it is possible to suppress the occurrence of individual differences in the sliding surface between products of the fiber guide, and it is possible to stabilize the yarn quality.

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

According to the sixth invention, a smooth surface shape can be formed on the sliding surface. Therefore, friction on the sliding yarn is suppressed.

A seventh invention is the fiber guide manufacturing method according to the fifth or sixth invention, wherein the uneven shape is formed so that the contact surface presents a circle when viewed from the front of the sliding surface.

According to the seventh invention, a smoother surface shape can be formed on the sliding surface. Therefore, the catching of the sliding yarn is further suppressed, and the friction to the yarn is reduced.

An eighth invention is a method for manufacturing a fiber guide according to any one of the fifth to seventh inventions, wherein the unevenness forming step includes a heat treatment step of baking the main body after the laser processing step. .

According to the eighth aspect of the invention, the edges generated at the edge of the recess in the laser processing process are smoothed. Therefore, the catching of the sliding thread is suppressed.

A ninth invention is a method for manufacturing a fiber guide according to any one of the fifth to eighth inventions, wherein a UV laser is used in the laser processing step.

According to the ninth aspect of the invention, the UV laser is suitable for fine processing, and can form a stable fine uneven shape even on a sintered body having coarser grains than metal.

A tenth invention is a method for manufacturing a fiber guide according to any one of the fifth to ninth inventions, wherein the main body is made of alumina ceramics.

According to the tenth aspect of the invention, the alumina ceramics are chemically stable and have high mechanical strength, so that the abrasion resistance of the fiber guide is improved.

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

It is a figure which shows the schematic diagram which shows a part of fiber manufacturing apparatus, and the cross section of an oiling guide (guide for fibers). It is a figure which shows the arrangement|sequence in front view of the uneven|corrugated shape which concerns on 1st Embodiment. It is a figure which shows the uneven|corrugated cross-sectional shape which concerns on 1st Embodiment. It is a figure which shows the example of a change of uneven|corrugated shape which concerns on 1st Embodiment. It is a figure which shows the arrangement|sequence in the front view of the uneven|corrugated shape which concerns on 2nd Embodiment. It is a figure which shows the uneven|corrugated cross-sectional shape which concerns on 2nd Embodiment. It is a figure which shows the example of a change of uneven|corrugated shape which concerns on 2nd Embodiment. 3 is a diagram showing a processed surface of Comparative Example 1. FIG. 1 is a diagram showing a processed surface of Example 1. FIG. FIG. 10 is a diagram showing a machined surface of Example 2; 3 is a diagram showing the roughness of the surface shape of Comparative Example 1. FIG. 4 is a diagram showing the roughness of the surface profile of Example 1. FIG. 1 is a schematic diagram of a device for measuring tension applied to a yarn; FIG. 4 is a diagram showing measurement results of tension applied to yarns in Example 1 and Comparative Example 1. FIG. FIG. 10 is a diagram showing a scum generation state of Comparative Example 1; FIG. 4 is a diagram showing a scum generation state in Example 1; FIG. 10 is a diagram comparing the state of oil retention on the processed surface between Example 1 and Comparative Examples 1 to 3;

<Structure of fiber guide (first embodiment)>
First, a first embodiment of the present invention will be described. A fiber guide according to an embodiment of the present invention is provided in a fiber manufacturing apparatus for manufacturing synthetic fibers, natural fibers, etc., and guides the yarn Y after spinning. Fiber guides include various guides such as oiling guides, snail guides, dogtail guides, hook guides, and slit guides. As a fiber guide according to this embodiment, an oiling guide 1 for supplying an oil for protecting the yarn Y 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, which is a raw material of fibers, and discharges it from a spinning nozzle 15 to form a plurality of threads Y, which are then cooled and solidified. The spun yarn Y first passes through the oiling guide 1 and moves in one direction along the extending direction of the yarn Y in a state in which a plurality of yarns are bundled. While guiding the yarn Y, the oiling guide 1 applies an oil containing a lubricant to the yarn Y for the purpose of reducing damage to the yarn Y in a post-process and improving the coherence of the yarn Y. Attach.

The oiling guide 1 has a main body 2 made of a sintered body. The sintered body forming the main body 2 can be appropriately selected from ceramics, sintered alloys, and the like. Ceramics include various ceramics such as alumina, zirconia, titania, and silicon carbide. Ceramics are harder than metals, and have heat resistance, wear resistance, oxidation resistance, and corrosion resistance. Sintered alloys include cemented carbide and cermet. Cemented carbide has a good balance of hardness, wear resistance, and toughness. Cermet combines the properties of ceramics such as high hardness, heat resistance, and wear resistance with the properties of metals such as viscosity and toughness.

Alumina ceramics is selected as a sintered body for the main body 2 of the oiling guide 1 according to this embodiment. Alumina ceramics are suitable because they have high strength and hardness, and are excellent in heat resistance, corrosion resistance, wear resistance, and electrical insulation.

A main body 2 of the oiling guide 1 has a guide groove 3 for guiding the yarn Y. The guide groove 3 is formed with the direction in which the yarn Y moves as its longitudinal direction. The yarn Y moves along the guide groove 3 in one direction. Further, the body 2 is provided with a discharge port 4 for discharging oil on the bottom surface of the guide groove 3, and a sliding surface 5 on which a portion of the yarn Y in the course of movement slides in the extending direction. A connection pipe 17 is connected to the fitting hole 6 communicating with the discharge port 4 , and oil is supplied from the pump 19 via the connection pipe 17 and the conduit 18 . Therefore, the yarn Y ejected from the many holes of the spinning nozzle 15 is sent toward the oiling guide 1 and enters the guide groove 3, where it is bundled into one yarn Y and placed on the sliding surface 5. It moves while being pressed and comes into contact with the oil agent discharged from the discharge port 4 . As a result, the yarn Y is coated with the oil solution.

The main body 2 of the oiling guide 1 has left and right side surfaces, a rear surface 2b, an upper surface 2c, and a lower surface 2d when the surface having the recess forming the guide groove 3 is defined as the front surface 2a and the width direction of the guide groove 3 is defined as the horizontal direction. It is block-shaped. Its outer shape is trapezoidal when viewed from the side, and the side shape is such that the front and rear sides are parallel to each other, and the upper and lower sides are inclined with respect to the front and rear sides. . The guide groove 3 extends through the main body 2 from the end of the upper surface 2c to the end of the lower surface 2d.

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

The sliding surface 5 is subjected to laser processing on its surface, and has an uneven shape 10 that is finer than the thread Y. As shown in FIG. FIG. 2 is a schematic diagram of the surface of the sliding surface 5 viewed from the front, showing the arrangement of the irregularities 10. As shown in FIG. Moreover, FIG. 3 shows the cross-sectional shape of the uneven shape 10 . The concave-convex shape 10 has a convex contact surface 11 including a contact portion 11a that contacts the yarn Y, and a concave portion 12 that is recessed from the contact surface 11 by cutting the sliding surface 5 .

As shown in FIG. 3, the contact surface 11 and the concave portion 12 are each formed in a curved shape so that the cross section of the uneven shape 10 has a wavy shape that repeats crests and troughs. The convex portion of the concave-convex shape 10 is formed in a curved shape so that the hem spreads from the apex of the peak, which is the contact surface 11 , to the bottom of the valley, which is the concave portion 12 . Here, a virtual plane Q is defined as a plane that continuously passes through the bisected position in the height direction on the middle slope connecting the peak of the mountain and the lowest point of the valley. In this case, the portion above the virtual plane Q corresponds to the contact surface 11 . The contact surface 11 has a circular shape when the sliding surface 5 is viewed from the front. The thread Y is in contact with the contact surface 11 along the height position P1 of the contact surface 11 . Further, a concave curved portion between the contact surfaces 11 , that is, a portion below the imaginary plane Q corresponds to the concave portion 12 .

As shown in FIG. 3, the contact surfaces 11 and the recesses 12 are alternately and continuously arranged with regularity. The circles arranged in FIG. 2 represent peaks and valleys of the uneven shape 10, that is, contact surfaces 11 and recesses 12. As shown in FIG. By determining the size of the circle, the size and spacing of the contact surfaces 11 and the recesses 12 in the uneven shape 10 are set. Note that the direction of the sliding surface 5 is defined as the up-down direction and the left-right direction shown in FIG.

The uneven shape 10 has contact surfaces 11 and recesses 12 arranged at regular intervals in accordance with the arrangement of the circles shown in FIG. Specifically, the recesses 12 are arranged at equal intervals L1 in the left-right direction, and the contact surfaces 11 are arranged between the recesses 12 and 12 . Furthermore, the arrangement of the contact surfaces 11 and the recesses 12 is continuously arranged 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 set arbitrarily. The concave-convex shape 10 may be configured such that all the concave portions 12 have the same depth H1 as shown in FIG. 3, or concave portions 12a and 12b have regularly different depths H2 and H3 as shown in FIG. Also good. The contact surfaces 11 are aligned at the protruding height positions P1.

<Configuration of Fiber Guide (Second Embodiment)>
Next, an oiling guide 1 (fiber guide) according to a second embodiment will be described. Note that the description of the configuration common to the first embodiment will be omitted, and the different configuration will be described. FIG. 5 is a front view of the surface of the sliding surface 5 of the main body 2. FIG. Moreover, FIG. 6 shows the cross-sectional shape of the uneven shape 20 . As shown in FIGS. 5 and 6, the sliding surface 5 is subjected to laser drilling on its surface and has a fine uneven shape 20 . The concave-convex shape 20 has a contact surface 21 including a contact portion 21a in contact with the yarn Y, and a concave portion 22 recessed from the contact surface 21 by cutting the sliding surface 5 .

The contact surfaces 21 and the recesses 22 are alternately and continuously arranged with regularity in the vertical direction and the horizontal direction. Specifically, when the sliding surface 5 is viewed from the front, a plurality of circular holes are provided as the concave portions 22 at equal intervals L3 in the vertical direction and the horizontal direction. Between the concave portions 22 and 22 , the contact surface 21 corresponds to the portion where the surface of the sliding surface 5 is left without being scraped. The contact surface 21 has the same height position P2. The thread Y is in contact with the contact surface 21 along the height position P2 of the contact surface 21 .

The concave portion 22 is formed into a curved shape. The main body 2 is subjected to heat treatment after the laser drilling process, and the edge of the concave portion 22 generated by the drilling process is removed. As a result, the uneven shape 20 is formed in a smooth state without minute protrusions or the like at the boundary between the recess 22 and the contact surface 21 . The size, depth (height difference with respect to the contact surface 21), arrangement interval, etc. of the concave portion 22 are arbitrarily set. For example, as shown in FIG. 6, recesses 22 having the same depth H4 may be arranged, and as shown in FIG. 7, recesses 22a and 22b having different depths H5 and H6 may be arranged. It may be configured as follows.

<Manufacturing Process of Fiber Guide (First Embodiment)>
Next, a manufacturing process of the oiling guide 1 (fiber guide) according to the above embodiment will be described. In the manufacturing process of the oiling guide 1 according to the first embodiment, the compact of the main body 2 of the oiling guide 1 is molded using 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 with a recess. Specifically, the front surface 2a of the main body 2 is recessed along the movement direction of the yarn Y, and the guide groove 3 is formed. The guide groove 3 extends through the main body 2 from the end of the upper surface 2c to the end of the lower surface 2d.

The guide groove 3 has a sliding surface 5 on which the yarn Y slides on its bottom surface. A discharge port 4 for discharging oil is provided on the upstream side of the bottom surface of the guide groove 3, and a plurality of depressions as oil reservoirs 7 are provided on the downstream side. The oil pools 7 are shaped like long grooves in the horizontal direction (the width direction of the guide groove 3) across the guide groove 3, and are arranged side by side along the moving direction of the yarn Y (the longitudinal direction of the guide groove 3). . A fitting hole 6 is provided in the main body 2 so as to communicate with the discharge port 4 . The molded body of the main body 2 is fired by a known firing method to become a sintered body of alumina ceramics.

The manufacturing process of the oiling guide 1 includes a polishing process and a concave-convex forming process. In the polishing step, the surface of the fired main body 2 is polished. Polishing is performed by, for example, mirror polishing after barrel polishing. Abrasives such as diamond are used for mirror polishing. In the polishing step, the surface of the main body 2 is processed into a mirror-like state by removing as many irregularities as possible.

The unevenness forming step is performed after the polishing step, and unevenness 10 finer than the thread 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 that has been flattened in the polishing process is subjected to laser processing (laser processing). By this process, as shown in FIG. 3, an uneven shape 10 having a convex contact surface 11 including a contact portion 11a in contact with the sliding yarn Y and a concave portion 12 recessed from the contact surface 11 is formed. .

The contact surface 11 and the concave portion 12 are formed in a curved shape so that the cross section of the uneven shape 10 has a wavy shape that repeats crests and troughs. Further, the convex portion of the uneven shape 10 is formed in a curved shape so that the base of the peak, which is the contact surface 11 , spreads toward the bottom of the valley, which is the concave portion 12 . If a plane continuously passing through the position that bisects in the height direction on the middle slope connecting the top of the mountain and the lowest point of the valley is assumed to be a virtual plane Q, the part above the virtual plane Q is the contact surface 11 corresponds to The contact surface 11 is shaped to have a circular shape when the sliding surface 5 is viewed from the front. Further, a concave curved portion between the contact surfaces 11 , that is, a portion below the imaginary plane Q corresponds to the concave portion 12 .

Further, the contact surfaces 11 and the recesses 12 are alternately and continuously arranged with regularity. The circles arranged in FIG. 2 represent peaks and valleys of the uneven shape 10 in the front view of the sliding surface 5, that is, the contact surface 11 and the recessed portions 12. As shown in FIG. An uneven shape 10 composed of a contact surface 11 and recesses 12 is formed according to the arrangement of the circles. The center of the circle and its periphery correspond to the contact portion 11 a of the contact surface 11 or the bottom of the recess 12 . By determining the size of the circle, the size and arrangement intervals 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 grinding the surface of the sliding surface 5, the concave portions 12 are arranged so that the bottoms of the concave portions 12 are equally spaced L1 in the left-right direction. A contact surface 11 is arranged. Furthermore, the arrangement of the contact surfaces 11 and the recesses 12 is continuously arranged at equal intervals L2 in the vertical direction. In this manner, the sliding surface 5 is processed to have a uniform surface condition.

The depth of the recess 12 (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 shape 10 is formed so that all concave portions 12 have the same depth H1. The contact surfaces 11 are aligned at the protruding height positions P1. Also, instead of the recesses 12 having the same depth H1, recesses 12a and 12b may be formed with regularly different depths H2 and H3 as shown in FIG.

A laser used in the laser processing step is appropriately selected. For example, a femtosecond laser, a UV laser, or the like is capable of fine processing with a hole diameter or processing width of 100 μm or less, and can form a fine irregular shape 10 on the sliding surface 5 . Ceramics have coarser grains than metals, and if they are destroyed by collision with laser light, they may be slightly roughened on the surface. Therefore, a UV laser with a shorter wavelength is suitable. In the case of a UV laser, the laser light is absorbed as heat, resulting in a melted surface, which enables smoother surface processing. Therefore, the friction on the running yarn Y can be reduced.

<Manufacturing Process of Fiber Guide (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. Since the polishing process is substantially the same as that of the first embodiment, the description is omitted.

A concave-convex forming process for the oiling guide 1 according to the second embodiment will be described. After the polishing step, in the unevenness forming step, unevenness 20 finer than the thread 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 that has been flattened in the polishing process is subjected to a drilling process using a laser, and as shown in FIG. is molded. As shown in FIG. 5, the recesses 22 are circular holes in a front view, and are arranged at regular intervals L3 in the vertical and horizontal directions. Between each concave portion 22 and the concave portion 22, a contact surface 21 including a contact portion 21a in contact with the sliding thread Y is formed. In this manner, the contact surface 21 and the recessed portion 22 are formed in the sliding surface 5 to form the concave-convex shape 20 in which the contact surface 21 and the recessed portion 22 are alternately and continuously arranged with regularity. In addition, in the concave-convex forming step, the step of cutting the sliding surface 5 with a laser and drilling a hole corresponds to the "laser machining step" in the present invention.

The concave portion 22 is formed into a curved shape as shown in FIG. The size, depth (height difference with respect to the contact surface 21), arrangement interval, etc. of the concave portion 22 are arbitrarily set. For example, all recesses 22 drilled in the sliding surface 5 may be formed with the same depth H4. Also, the concave portions 22a and 22b may be formed with different depths H5 and H6 (see FIG. 7). The contact surface 21 is composed of a portion of the sliding surface 5 that has not been scraped off, and has a uniform height position P2. A laser used in the laser processing step can be appropriately selected, and a UV laser is suitable as in the first embodiment.

The concave-convex forming step includes a heat treatment step of baking the main body 2 after the laser processing step. In the heat treatment process, the main body 2 is re-fired. When the ceramics are refired in this manner, the crystals on the surface grow and the edges of the recesses 22 generated by the drilling process become smooth. As a result, the irregular shape 20 is formed in a smooth state without minute protrusions or the like at the boundary between the concave portion 22 and the contact surface 21 .

<Action/effect>
As shown in FIG. 1, when the oiling guide 1 (fiber guide) according to the above embodiment is installed along the movement direction of the spun yarn Y, the yarn Y passes through the guide groove 3 of the oiling guide 1. to move downstream. Specifically, the yarn Y discharged from a large number 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 pushed onto the sliding surface 5. Move while being hit. Oil is supplied from the discharge port 4 of the oiling guide 1 and adheres to the yarn Y. The thread Y slides while being in contact with the contact surfaces 11 and 21 of the sliding surface 5 . By processing the sliding surface 5 into fine irregularities 10 and 20, the areas of the contact surfaces 11 and 21 are reduced, and the friction to the sliding yarn Y can be suppressed. In addition, the concave portions 12, 12a, 12b, 22, 22a, and 22b have the function of retaining the oil, and allow the oil to adhere to the yarn Y in a sufficient and stable manner.

In the oiling guide 1 according to the above-described first and second embodiments, on the sliding surface 5, fine irregularities 10 and 20 are formed on the thread Y with regularity. The sliding surface 5 has a smooth surface shape as a whole where the height positions P1 and P2 of the contact surfaces 11 and 21 are aligned. Therefore, the height positions of the contact portions 11a and 21a with which the yarn Y contacts are aligned, and the friction against the yarn Y is uniformly reduced on the entire sliding surface 5. As shown in FIG. In addition, if the friction on the yarn Y becomes uniform, the quality of the produced yarn can be stabilized.

In the oiling guide 1 according to the first and second embodiments, on the sliding surface 5, the oil applied to the yarn Y is applied to the recesses 12, 12a, 12b, 22, 22a, 22b of the fine uneven shapes 10, 20. It stays on and improves the retention function of the oil. In addition, since the uneven shapes 10 and 20 have regularity, the oil can be uniformly maintained.

The main body 2 of the oiling guide 1 according to the first and second embodiments is made of alumina ceramics. Since alumina ceramics are chemically stable and have high mechanical strength, the oiling guide 1 is improved in wear resistance.

The sliding surface 5 of the oiling guide 1 according to the first embodiment has a curved contact surface 11 . Since the yarn Y slides in contact with the smooth contact surface 11, the friction to the yarn Y is reduced. Further, the contact surface 11 presents a circle when the sliding surface 5 is viewed from the front. As a result, the catching of the sliding yarn Y is further suppressed, and the friction to the yarn Y is reduced.

The sliding surface 5 of the oiling guide 1 according to the second embodiment has circular concave portions 22, 22a, and 22b when viewed from the front. As a result, concave portions 22, 22a, and 22b that do not have corners when viewed from the front of the sliding surface 5 are arranged. Therefore, the yarn Y is prevented from being caught at the boundaries between the contact surface 21 and the recesses 22, 22a, 22b.

According to the manufacturing process of the oiling guide 1 (fiber guide) according to the first and second embodiments, the surface of the sliding surface 5 is shaved with a laser, and the uneven shapes 10 and 20 that are finer than the thread Y are formed. be done. In the uneven shapes 10 and 20, the contact surfaces 11 and 21 with which the yarn Y contacts and the concave portions 12, 12a, 12b, 22, 22a and 22b are arranged with regularity. With laser processing, it is easier to process fine surface shapes than in the case of heat treatment in a high-temperature furnace, and the same surface shape can be reproduced repeatedly. Therefore, it is possible to suppress 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 oiling guide 1 according to the first and second embodiments, the sliding surface 5 is subjected to laser processing. By performing surface treatment by laser processing, the time required for heat treatment can be greatly reduced compared to, for example, conventional satin finish processing by heat treatment (see FIG. 8). Furthermore, energy consumption due to the use of high-temperature furnaces is also suppressed, leading to a reduction in carbon dioxide emissions. Moreover, if a laser is used, the shape pattern and size of unevenness|corrugation can be set according to a use application, and a fine surface shape can be formed as designed. In this way, since laser processing enables fine control of surface processing, by appropriately setting the shape and arrangement of unevenness, it is possible to form a surface shape with lower friction and a higher ability to retain oil.

A UV laser is used in the laser processing steps according to the first and second embodiments. UV lasers are suitable for microfabrication, and can form stable, fine uneven shapes even on ceramics, which have coarser particles than metals.

In the oiling guide 1 according to the first and second embodiments, laser processing is performed on the surface of the sliding surface 5 that has been mirror-finished in the polishing process. Laser processing controls the output light and melts and evaporates the irradiated portion without contacting the processing surface. , the distance of the laser output to the machined surface can be made more accurate. Therefore, the uneven shapes 10 and 20 with high accuracy can be formed.

In the manufacturing process of the oiling guide 1 according to the first embodiment, the contact surface 11 of the uneven shape 10 is formed into a curved shape. Furthermore, the contact surface 11 is formed to have a circular shape when the sliding surface 5 is viewed from the front. Thereby, a smooth surface shape can be formed on the sliding surface 5 . Therefore, the sliding yarn Y is prevented from being caught, and the friction to the yarn Y is reduced.

In the manufacturing process of the oiling guide 1 according to the second embodiment, the recessed portions 22, 22a, and 22b of the uneven shape 20 are formed in a circular shape when the sliding surface 5 is viewed from the front. As a result, recesses 22, 22a, and 22b that do not have corners when viewed from the front of the sliding surface 5 are arranged, and a smooth surface shape can be formed. Therefore, the yarn Y is prevented from being caught at the boundaries between the contact surface 21 and the recesses 22, 22a, 22b.

In the manufacturing process of the oiling guide 1 according to the second embodiment, the unevenness forming process includes a heat treatment process for baking the main body 2 after the laser machining process. By refiring the main body 2 made of ceramics, the edges of the recesses 22, 22a, 22b generated in the laser machining process are smoothed. Therefore, the catching of the sliding yarn Y is suppressed.

EXAMPLES The present invention will be specifically described below with reference to examples and comparative examples.
[Example 1]
A main body 2 of an oiling guide 1 (fiber guide) made of alumina ceramics (sintered body) was barrel-polished and then mirror-polished. A UV laser was used to form fine irregularities on the mirror-finished surface. The surface is formed in a corrugated shape that repeats crests and troughs, and contact surfaces 31 and recesses 32 are alternately and continuously arranged with regularity (see FIGS. 9 and 12).
[Example 2]
A main body 2 made of alumina ceramics was barrel-polished and then mirror-polished. A UV laser was used to drill a plurality of fine holes on the mirror-finished surface. A conventional heat treatment was then performed. Circular holes (recesses 33) are arranged with regularity when viewed from the front. A contact surface 34 is provided between the recesses 33 (see FIG. 10).
[Comparative Example 1]
A main body 2 made of alumina ceramics was barrel-polished and then mirror-polished. By heat treatment (re-baking), crystals were raised on the surface to give a satin finish (see FIGS. 8 and 11).
[Comparative Example 2]
A main body 2 made of alumina ceramics was barrel-polished and then mirror-polished.
[Comparative Example 3]
A main body 2 made of alumina ceramics was barrel-polished. No subsequent surface treatment is performed.

<Regarding surface roughness>
11 and 12 are diagrams showing characteristics of surface roughness charts for surface finishes according to Comparative Example 1 and Example 1, respectively. Compared to Comparative Example 1 (see FIG. 11), which has a pear-skinned surface by conventional heat treatment, the surface that has undergone UV laser processing (see FIG. 12) as in Example 1 has stable unevenness in size and shape. , a low-friction surface condition can be obtained.

<Regarding tension and amount of scum>
As shown in FIG. 13, the yarn Y sent out from the yarn package 40 was run through the oiling guides 1 (fiber guides) according to Example 1 and Comparative Example 1, respectively. A tension T1 on the entry side 41 (upstream in the running direction) and a tension T2 on the exit side 42 (downstream in the running direction) of the oiling guide 1 were measured. When the yarn Y runs on the sliding surface of the oiling guide 1, a mixture of the oil of the yarn Y and the scum S of the yarn Y, which is presumed to have been scraped off by the fine irregularities on the surface, adheres as scum S. FIG. 14 is a diagram showing the measurement results of the tensions T1 and T2 and the amount of scum generated. 15 and 16 show the scum S generation state in Comparative Example 1 and Example 1, respectively. In the oiling guide 1 of Example 1, the difference in tension between the upstream and downstream (T2-T1) is smaller than that of Comparative Example 1, the scum S is less generated, and the friction to the yarn Y is suppressed. there is

<About oil holding function>
Bar-shaped alumina ceramics, which had been surface-finished according to Example 1 and Comparative Examples 1 to 3, were dip-coated with a colored oil solution. After that, it was left in the air for a certain period of time, and the progress of the oil agent adhering to the surface was observed. FIG. 17 is a diagram showing the retention state of the oil on each surface (A: Example 1, B: Comparative Example 1, C: Comparative Example 2, D: Comparative Example 3). Compared with Comparative Examples 1 to 3, Example 1 produced a thin and uniform oil agent film F on the surface. By applying the surface finish of Example 1 in this manner, the oil agent adheres evenly and uniformly to the surface of the alumina ceramics. That is, it is possible to obtain a sliding surface having a higher function of retaining oil. Therefore, the friction with the sliding yarn is suppressed, and the abrasion of the yarn can be reduced.

<Change example>
The fiber guide and the manufacturing method thereof according to the present invention are not limited to the appearance and configuration described in the first and second embodiments, and various modifications, additions, deletions, and configurations can be made without changing the gist of the present invention. Depending on the combination, it can be implemented in various other forms.

Although the oiling guide 1 has been exemplified and explained as the "fiber guide" in the present invention, it is not limited to this, and various other fiber guides such as snail guides, dogtail guides, hook guides, slit guides, etc. are also included. It is something that can be done. Further, the oiling guide 1 is not limited to the shape according to the above embodiment, and other shapes can be applied. The sintered body forming the main body of the fiber guide is not limited to alumina ceramics, and ceramics using other materials, or sintered alloys such as cemented carbide and cermet can be appropriately selected.

The concave and convex shape on the sliding surface is not limited to the above embodiment. Other configurations can be employed, such as a configuration in which . The shape of the concave portion 22 when viewed from the front is not limited to a circular shape, and can be appropriately changed to another shape.

1 Oiling guide (fiber guide)
2 Main body 3 Guide groove 4 Discharge port 5 Sliding surfaces 10, 20 Concavo-convex shapes 11, 21 Contact surfaces 11a, 21a Contact parts 12, 22 Concave portion Y Threads P1, P2 Height position

Claims (10)

A fiber guide that guides a yarn moving in one direction along the extending direction in a state in which a plurality of yarns are bundled after spinning,
Equipped with a main body made of a sintered body,
The main body has a sliding surface on which a part of the yarn in the extending direction slides during movement,
The sliding surface has an uneven shape that is finer than the thread on its surface,
In the uneven shape, a contact surface including a contact portion in contact with the yarn and a concave portion recessed from the contact surface by scraping the sliding surface are arranged alternately and continuously with regularity, A fiber guide, wherein the height positions of the contact surfaces are aligned. A fiber guide according to claim 1,
The fiber guide, wherein the sliding surface has the curved contact surface. The fiber guide according to claim 1 or 2,
The fiber guide, wherein the contact surface presents a circle when the sliding surface is viewed from the front. The fiber guide according to any one of claims 1 to 3,
The fiber guide, wherein the main body is made of alumina ceramics. A method for manufacturing a fiber guide that guides a yarn moving in one direction along the extension direction in a state in which a plurality of yarns are bundled after spinning,
a polishing step of polishing the surface of the main body made of the sintered body to a mirror surface;
an unevenness forming step of forming finer unevenness than the thread on a sliding surface of the main body on which a part of the thread in the extending direction slides during movement,
The unevenness forming step includes a laser processing step of cutting the sliding surface with a laser,
In the uneven shape, a contact surface including a contact portion in contact with the yarn and a concave portion recessed with respect to the contact surface are alternately and continuously arranged with regularity, and the contact surface has a height. A method for manufacturing a aligned fiber guide. A method for manufacturing the fiber guide according to claim 5,
The method for manufacturing a fiber guide, wherein the uneven shape is formed such that the contact surface has a curved surface shape. A method for manufacturing the fiber guide according to claim 5 or 6,
The method for manufacturing a fiber guide, wherein the concave-convex shape is formed such that the contact surface has a circular shape when viewed from the front of the sliding surface. A method for manufacturing the fiber guide according to any one of claims 5 to 7,
The method of manufacturing a fiber guide, wherein the unevenness forming step includes a heat treatment step of baking the main body after the laser processing step. A method for manufacturing the fiber guide according to any one of claims 5 to 8,
The method for manufacturing a fiber guide, wherein the laser processing step uses a UV laser. A method for manufacturing the fiber guide according to any one of claims 5 to 9,
A method for manufacturing a fiber guide, wherein the main body is made of alumina ceramics.

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