JP7162459B2 - Ring/traveler type of ring spinning machine - Google Patents

Description

The present invention relates to a ring/traveler system of a ring spinning machine.

In the ring/traveler system of a ring spinning machine, a traveler slides on the ring when the yarn is wound onto the bobbin. At that time, wear and seizure due to friction are likely to occur on the sliding surfaces of the traveler and the ring. Particularly in recent years, the movement speed of the traveler on the ring has been increased in order to improve the productivity of the ring spinning machine, which tends to accelerate the wear of the traveler and the ring. If the wear of the traveler or ring progresses quickly, the life of the ring/traveler system will be shortened, and parts such as the traveler will need to be replaced frequently. In general, wear of the traveler and the ring progresses faster as the frictional force generated on the sliding surfaces of the two increases. Therefore, as a method of suppressing wear of the traveler and the ring, for example, there is a method of using a lubricating liquid such as oil. However, in this method, the yarn is stained by the adhesion of the lubricating liquid.

Therefore, in Patent Document 1, in order to extend the life of the ring/traveler system without using lubricating fluid, "In the ring/traveler system of the ring spinning machine, the sliding surface between the traveler and the ring when the traveler slides is , with a depth of 0.5 to 8 μm and a diameter of 5 to 30 μm. It is

JP 2015-203175 A

However, when the inventors of the present application conducted an intensive study on the invention described in Patent Document 1, in order to extend the service life of the ring/traveler system, a depression formed in the sliding surface between the traveler and the ring (hereinafter referred to as " dimple”). ) has not been sufficiently studied.

The present invention has been made in order to solve the above-mentioned problems. To provide a ring/traveler system for a ring-type spinning machine capable of further extending the life of the ring/traveler system by optimizing the shape and arrangement of dimples formed on the sliding surface between the ring and the ring.

The present invention relates to a ring/traveler system of a ring spinning machine that slides in a non-liquid lubrication environment, wherein a plurality of dimples each having a circular open end are formed on the sliding surface between the traveler and the ring when the traveler slides. The plurality of dimples satisfies the condition that the dimple wall surface angle is 11.3 ° or more and 39 ° or less, the arrangement pitch of the plurality of dimples on the sliding surface is P (μm), and the circular opening is formed. The value of P/D is 2.5 or more , where D (μm) is the diameter of the end. 5 or less, and the plurality of dimples is a ring/traveler system of a ring spinning machine having a cross-sectional shape of any one of mortar-shaped, conical, and trapezoidal .

In the ring/traveler system of the ring spinning machine of the present invention, the plurality of dimples may satisfy the condition that the diameter of the circular open end is 10 μm or more and 60 μm or less.

In the ring/traveler system of the ring spinning machine of the present invention, the plurality of dimples may satisfy the condition that the dimple depth is 2 μm or more and 20 μm or less.

In the ring/traveler system of the ring spinning machine of the present invention, the plurality of dimples may satisfy the condition that the dimple area ratio on the sliding surface is 4% or more and 20% or less.

According to the present invention, the shape and arrangement of the dimples formed on the sliding surface between the traveler and the ring can be optimized to further extend the life of the ring/traveler system.

An example of the configuration of the ring/traveler system of a ring-type spinning machine is shown. (a) is a perspective view of the ring, (b) is a partially enlarged perspective view of the ring, and (c) shows the relationship between the traveler and the ring during spinning. It is a perspective view showing typically. FIG. 10(a) is a front view and FIG. 1(b) is a cross-sectional view showing a periodic structure portion formed by dimples. FIG. 4 is a schematic diagram for explaining shape parameters of dimples; FIG. 5 is a schematic diagram showing a first modified example of the cross-sectional shape of the dimple. FIG. 10 is a schematic diagram showing a second modification of the cross-sectional shape of the dimple; FIG. 4 is a schematic diagram showing the interrelationship of dimple wall angle and P/D values with deposit storage and deposit resupply functions; FIG. 5 is a diagram showing evaluation results of examples , reference examples, and comparative examples regarding the life of a ring/traveler system; (a) is a front view of a dimple formed under the conditions of Example 1, and (b) is a cross-sectional view of the dimple. (a) is a front view of a dimple formed under the conditions of Example 2, and (b) is a cross-sectional view of the dimple. (a) is a front view of a dimple formed under the conditions of Example 3, and (b) is a cross-sectional view of the dimple. (a) is a front view of a dimple formed under the conditions of Example 4, and (b) is a cross-sectional view of the dimple. (a) is a front view of a dimple formed under the conditions of a reference example , and (b) is a cross-sectional view of the dimple. (a) is a front view of a dimple formed under the conditions of Comparative Example 1, and (b) is a cross-sectional view of the dimple. (a) is a front view of a dimple formed under the conditions of Comparative Example 2, and (b) is a cross-sectional view of the dimple. (a) is a front view of a dimple formed under the conditions of Comparative Example 3, and (b) is a cross-sectional view of the dimple. (a) is a front view of a dimple formed under the conditions of Comparative Example 4, and (b) is a cross-sectional view of the dimple.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a configuration example of a ring/traveler system of a ring-type spinning machine, (a) is a perspective view of the ring, (b) is a partially enlarged perspective view of the ring, and (c) is a traveler and It is a perspective view which shows the relationship of a ring typically. "Ring-type spinning machine" means a spinning machine such as a ring spinning machine and a ring twisting machine that winds yarn through a traveler that slides on a ring that is supported by a ring rail and moves up and down.

In FIGS. 1(a)-(c), the ring 11 and the traveler 12 constitute a ring/traveler system. Ring 11 is made of, for example, bearing steel. A flange 11 a is formed on the ring 11 so as to be integral with the ring 11 . The flange 11a is formed to have a T-shaped cross section.
On the other hand, the traveler 12 is made of, for example, oxidized spring steel. The traveler 12 is formed in a C shape. Traveler 12 is attached to flange 11 a of ring 11 .

A chrome plating layer 13 is formed on the surface of the flange 11a of the ring 11. As shown in FIG. Chrome plated layer 13 is preferably a hard chromium plated layer, and is formed to have a thickness of, for example, about 10 to 20 μm. A hard chrome plating layer refers to a plating layer defined in JIS H8615 industrial chrome plating. Of the chromium plating layer 13 covering the flange 11a, a periodic structure portion 14 is formed at least on the surface layer portion of the chromium plating layer 13 covering the inner peripheral surface of the flange 11a. The periodic structure portion 14 is a portion for reducing wear of parts that occurs when the traveler 12 slides on the ring 11 .

In this embodiment, the flange 11a of the ring 11 is covered with a chromium plating layer 13, and the periodic structure 14 is formed on the inner surface of the flange 11a through the chromium plating layer 13. As shown in FIG. In addition to the chrome plating layer 13, the surface of the nickel plating or the like has mechanical properties comparable to those of the chrome plating layer 13 or higher mechanical properties than the traveler material, for example, nickel plating having a hardness higher than that of the traveler material. Substitutions are possible with treated coatings.

When the ring-type spinning machine winds the yarn on the bobbin, the yarn Y is passed through the traveler 12 as shown in FIG. 1(c). The yarn Y is sent out from a drafting device (not shown) and wound on a bobbin (not shown) via the traveler 12 . At that time, a predetermined tension is applied to the thread Y that is passed through the traveler 12 . Therefore, the traveler 12 is pulled by the thread Y and comes into contact with the flange 11a of the ring 11, and circulates along the flange 11a while maintaining the contact state. Therefore, the traveler 12 slides (sliding) on the ring 11 while the yarn Y is being wound around the bobbin, ie, during spinning.

Here, the sliding surface between the traveler 12 and the ring 11 when the traveler 12 slides is the surface where the ring 11 and the traveler 12 contact each other. Therefore, sliding surfaces between the traveler 12 and the ring 11 are present on both the ring 11 and the traveler 12 . In this embodiment, as an example, the sliding surface of the ring 11 against the traveler 12 is the periodic structure portion 14 . Specifically, a configuration is employed in which the inner peripheral surface of the flange 11a of the ring 11 is covered with a chromium plating layer 13, and the periodic structure portion 14 is formed on the surface of the chromium plating layer 13. As shown in FIG. Therefore, in this embodiment, the periodic structure portion 14 of the chromium plating layer 13 covering the inner peripheral surface of the flange 11 a corresponds to the sliding surface between the traveler 12 and the ring 11 .

A plurality of dimples 15 are formed in the periodic structure portion 14 of the chromium plating layer 13, as shown in FIGS. 2(a) and 2(b). FIG. 2(a) is a front view of the periodic structure portion, and FIG. 2(b) is a sectional view taken along line AA of FIG. 2(a).

The periodic structure portion 14 is constructed by periodically arranging a plurality of dimples 15 at a predetermined pitch. In this embodiment, as an example, a plurality of dimples 15 are arranged in a zigzag pattern. Each dimple 15 is recessed from the principal surface 14 a of the periodic structure portion 14 . The main surface 14a of the periodic structure portion 14 is a surface excluding the recessed portion due to the dimples 15. As shown in FIG. Each of the dimples 15 has a circular open end 15a. An open end 15 a of each dimple 15 is circularly opened on the main surface 14 a of the periodic structure portion 14 . Each dimple 15 is formed with a mortar-shaped cross section. Each dimple 15 has a wall surface 15b that rises obliquely from the bottom of the dimple 15 toward the main surface 14a of the periodic structure portion 14. As shown in FIG.

In this embodiment, the plurality of dimples 15 forming the periodic structure portion 14 are formed so as to simultaneously satisfy the following two conditions.
(Condition 1) The dimple wall surface angle is 10° or more and 65° or less.
(Condition 2) The value of P/D is 1.9 or more, where P (μm) is the arrangement pitch of the plurality of dimples 15 in the periodic structure portion 14, and D (μm) is the diameter of the circular opening end 15a. .5 or less.

Here, the dimple wall surface angle, the arrangement pitch of the plurality of dimples 15 (hereinafter also referred to as "dimple pitch"), the diameter of the circular open end 15a (hereinafter also referred to as "dimple diameter"), and the depth of the dimples 15 (hereinafter also referred to as “dimple depth”) will be explained.
As shown in FIG. 3, the dimple wall surface angle is expressed as the angle θ (°) formed between the main surface 14a of the periodic structure 14 and the wall surface 15b of the dimple 15 at the opening end 15a where the main surface 14a and the wall surface 15b of the dimple 15 are in contact. be done. The dimple pitch is represented by the center-to-center distance P (μm) between two adjacent dimples 15 on the main surface 14a of the periodic structure portion 14, as shown in FIGS. 2(a) and 2(b). Although FIG. 2 shows an example in which the arrangement pitch P of the dimples 15 is the same in all directions, the arrangement pitch may be changed depending on the direction of the adjacent dimples 15 . However, if there are two or more different arrangement pitches, the P/D value must satisfy the above (condition 2) for all arrangement pitches. As shown in FIG. 3, the dimple diameter is represented by the diameter D (μm) of the open end 15a of the dimple 15 that is circularly opened on the principal surface 14a of the periodic structure 14. As shown in FIG. The dimple depth is represented by the maximum depth S (μm) of the dimple 15 with respect to the main surface 14a of the periodic structure portion 14, as shown in FIG.

Although FIG. 3 shows the dimple 15 having a mortar-shaped cross-section as an example, the present invention is not limited to this, for example, the dimple 15 having a conical cross-section as shown in FIG. A dimple 15 having a trapezoidal cross-sectional shape as shown in FIG. The shape of the open end 15a of the dimple 15 is circular regardless of which cross-sectional shape is adopted.

The "circle" representing the opening shape of the open end 15a is preferably a perfect circle, but is not limited to this, and may be an ellipse with an ellipticity of 0.8 or more, for example. In this case, the dimple wall surface angle θ should satisfy the condition that the dimple wall surface angle θ in at least one of the major axis direction and the minor axis direction of the ellipse is 10° or more and 65° or less. Regarding the dimple diameter, when the length of at least one of the major axis and the minor axis of the ellipse is applied to the dimple diameter D (μm), the value of P/D is 1.9 or more. .5 It is sufficient if the following conditions are satisfied.

Regarding the plurality of dimples 15, the dimple depth S is preferably 2 μm or more. Also, the dimple diameter D is preferably 10 μm or more and 60 μm or less. Further, the dimple area ratio in the periodic structure portion 14 is preferably 4% or more and 20% or less. The dimple area ratio is a value expressed as a percentage of the area of the entire dimple 15 to the area of the entire sliding surface between the traveler 12 and the ring 11 .

A plurality of dimples 15 can be formed by laser processing, for example. When forming the dimples 15 by laser processing, it is preferable to apply picosecond laser processing using picosecond pulsed laser light. In picosecond laser processing, by controlling the direction of picosecond pulsed laser light emitted by a laser oscillator using a galvanometer optical system, the irradiation position of the laser light on the workpiece can be changed. Therefore, when the periodic structure portion 14 is provided on the ring 11, the sliding surface of the ring 11 is irradiated with picosecond pulsed laser light by the galvano optical system, and the irradiation position is sequentially shifted by the galvano optical system. It is possible to form a plurality of dimples 15 with an arrangement of .

Here, the mechanism of wear reduction by the periodic structure portion 14 will be described.
First, in this embodiment, the sliding surface between the ring 11 and the traveler 12 is a surface that slides under a non-liquid lubrication environment. Non-liquid lubrication refers to a state in which no liquid lubricant exists. In general, when metals slide against each other in a non-liquid lubricating environment, severe wear occurs on the sliding surfaces. In particular, in the ring/traveler system, since the traveler 12 circulates on the ring 11 at a high speed, wear progresses rapidly on the sliding surfaces of both, and it is expected that seizure will occur in several minutes to several hours. However, in the actual ring/traveler system, the progress of wear is unexpectedly slow. For example, cotton spinning typically allows the traveler 12 to be used for one to two weeks without replacement. For this reason, the sliding surfaces of the ring 11 and the traveler 12 are tribologically considered not to be non-lubricated but to be in a state of boundary lubrication. Specifically, deposits containing thread-derived lubricating components (mainly carbon) adhere to the sliding surface on which the traveler 12 slides on the ring 11, and the deposits spread uniformly and thinly to perform the lubricating function. It is presumed that solid contact between the metals of the ring 11 and the traveler 12 is suppressed, and wear on the sliding surface is reduced. Also, it is presumed that the deposits are produced when cellulose fibers are detached from the yarn Y passing through the traveler 12 during spinning, and these fibers are entangled with abrasion powder of the traveler or the like. According to Reference 1 below, it is reported that the frictional force between the ring 11 and the traveler 12 when spinning on the same spinning machine is half the frictional force on the testing machine when spinning is not performed. . According to Reference 2 below, it is reported that the wear rate of the traveler 12 is lower than the wear rate of the tester without spinning due to the lubricating function of spinning. In this way, the lubricating function by general spinning can reduce the frictional force against the non-spinning test machine and suppress wear, but it cannot completely prevent wear, so solid contact is not possible. It turns out that it is not sufficiently prevented. In the present invention, the use of dimples can significantly improve the lubricating function in a general ring/traveler system.
(Reference 1) Yoichi Shimoma, Takuzo Fujii, Textile Engineering, Friction Characteristics and Speed Limits of High Speed Ring Traveler Mechanism, 1969, Vol.22, No.11, P775-P784
(Reference 2) Yoichi Shimotsuma, Takuzo Fujii, Textile Engineering, Wear Characteristics of Ring Traveler Mechanism, 1970, Vol. 23, No. 4, P267-P277

In the ring/traveler system of this embodiment, a plurality of dimples 15 are formed on the sliding surface between the ring 11 and the traveler 12 when the traveler 12 slides. The yarn Y wound around the bobbin via the traveler 12 slides on the traveler 12 having a surface roughness to generate abrasion powder of the cellulose fibers, and the fluff integrated with the yarn Y is sheared. separate from yarn Y; Cellulose fibers such as wear dust and fluff are generated at the sliding portion between the ring 11 and the traveler 12 and scattered around. Therefore, when the cellulose fibers separated from the yarn Y enter the sliding surface between the ring 11 and the traveler 12, some of them flow into the respective dimples 15 formed on the sliding surface, and most of the fibers moves in the sliding surface, and the thread-derived lubricating component contained in the fiber spreads in a thin film on the sliding surface between the ring 11 and the traveler 12 and the inner surface of the dimple 15 . In other words, it is considered that the cellulose fibers containing the thread-derived lubricating component are partly adhered to and held by the dimples 15 and flow while spreading into a thin film on the sliding surface between the ring 11 and the traveler 12 . As a result, a coating of deposits containing cellulose fibers is formed on the sliding surfaces of the ring 11 and the traveler 12, and this coating functions to lubricate and prevent direct contact between the ring 11 and the traveler 12, resulting in wear. A reduction effect can be obtained. Therefore, wear of the ring 11 and the traveler 12 can be suppressed even in a non-liquid lubrication environment. In a general ring 11 without dimples 15, the space for adhering and holding the cellulose fibers is limited only to a very fine space formed between the ring 11 and the traveler 12 by the surface roughness of both. . Therefore, when the ring 11 without the dimples 15 is used, the volume of the space for adhering and holding the cellulose fibers is greatly reduced compared to when the ring 11 with the dimples 15 is used. As a result, when the ring 11 without the dimples 15 is used, the area of the coating, which is considered to be formed by the extension of the deposits, becomes very small compared to when the ring 11 with the dimples 15 is used. It can be interpreted that the solid contact area of the traveler 12 is increased.

In order to maintain the lubricating function of the deposits satisfactorily, the dimples 15 must fulfill the functions of storing the deposits containing lubricating components derived from the thread and resupplying the stored deposits to the sliding surface. In other words, the dimples 15 take in and store deposits generated during spinning, and resupply the stored deposits to the sliding surface, thereby maintaining the lubricating function of the deposits. As a result of intensive studies by the present inventors, as shown in FIG. 6, the values of the dimple wall surface angle θ and P/D are closely related to the deposit storage function and the deposit resupply function, respectively. I found out that I do.

In considering the deposit storage and resupply functions, the flow behavior of deposits in the space between traveler 12 and ring 11 must be understood. The centrifugal force of the traveler 12 is applied to the adhering matter as a force acting vertically on the ring 11 (hereinafter referred to as "vertical force"), and the rotational force of the traveler 12 generated by winding the yarn Y around the bobbin is applied. It is added as a shear force. Therefore, the deposit is simultaneously subjected to compressive and shear forces. From the observed wear of traveler 12, it is clear that the deposits are not strong enough to prevent solid contact between ring 11 and traveler 12 under these normal and shear forces. Therefore, it is considered that the adhered matter flows as the traveler 12 moves, and is sandwiched between the traveler 12 and the ring 11 during that time, thereby suppressing solid contact. When the dimple wall surface angle θ is small, it is considered that the resistance to the flow of deposits is low and the deposits move easily. On the other hand, when the dimple wall surface angle .theta. If the resistance is extremely high, it is believed that the cellulose accumulated in the dimples will remain and the deposits will flow on the surface of the ring 11 . On the other hand, the value of P/D indicates the ratio between the length of the surface in solid contact and the length of deposits stored on the dimple 15 . As a result of the extension of the life of the traveler 12, it is presumed that there was a period during which solid contact was suppressed by forming a space while deposits moved between the ring 11 and the traveler 12, the length of the solid contact surface being P. be. Although the normal force from the traveler 12 is acting on the ring 11, it is considered that a larger reaction force is generated due to the flow of the deposits. If the P/D value is small, the adhering matter will flow within the dimples and will not generate a sufficient reaction force. Solid contact with the traveler 12 is more likely to occur. When the value of P/D is large, the length that generates the reaction force is large, but since there is little cellulose stored in the dimples, the space between the ring 11 and the traveler 12 that are uniformly spread is small, and the solid body is solid. contact becomes easier. The values of the dimple wall angle θ and P/D, two factors required for deposit storage and resupply, must be satisfied at the same time because these factors are linked to deposit flow. In the ring-type spinning machine, from the high-speed photograph of the traveler behavior shown in Reference 3 below and the contact portion of the traveler shown in Reference 1 above, the contact portion of the traveler is not constant, so the dimple wall angle θ and P / D Since it is not possible to obtain the values of by calculation, those values are obtained experimentally. Specifically, if the dimple wall surface angle θ is too large or too small, it becomes difficult for the deposits to be stored in the dimples or to be resupplied to the sliding surface. Also, if the value of P/D is too large or too small, it becomes difficult for deposits to be stored in the dimples or to be resupplied to the sliding surface. Therefore, the dimple wall surface angle θ is preferably 10° or more and 65° or less, and the P/D value is preferably 1.9 or more and 4.5 or less. By defining the values of the dimple wall surface angle .theta. and P/D in this manner, the deposits are easily stored in the dimples 15, and the stored deposits are easily resupplied to the sliding surface. Therefore, the lubricating function of the deposits can be maintained well, and the life of the ring/traveler system can be further extended.
(Reference 3) Yoichi Shimotsuma, Takuzo Fujii, Textile Engineering, Behavior of Traveler in High Speed Ring Traveler Mechanism, 1969, Vol.22, No.7, P493-P499

In order to confirm the wear reduction effect of the periodic structure portion 14, the present inventors evaluated the service life of the parts using the rings 11 having different conditions for forming the dimples 15. FIG. The results are shown in FIG.
In FIG. 7, the products to be evaluated are divided into Example 1, Example 2, Example 3, Example 4, Reference Example , Comparative Example 1, Comparative Example 2, Comparative Example 3, and Comparative Example 4. ing. Among them, in Examples 1 to 4 and Comparative Examples 1 to 3, the cross-sectional shape of the dimples is mortar-shaped. Further, the reference example has a trapezoidal dimple cross-sectional shape, and the comparative example 4 has a rectangular dimple cross-sectional shape. The conditions for forming the dimples 15 will be described in detail below.

(Example 1)
In Example 1, the dimple wall surface angle = 11.3°, P/D = 3.5, dimple area ratio = 6%, dimple diameter = 20 µm, dimple depth = 2 µm, and dimple pitch = 70 µm. forming FIG. 8(a) is a front view of a dimple formed under the conditions of Example 1, and FIG. 8(b) is a cross-sectional view of the dimple.

(Example 2)
In Example 2, dimple wall angle = 21.8°, P/D = 2.5, dimple area ratio = 13%, dimple diameter = 40 µm, dimple depth = 8 µm, and dimple pitch = 100 µm. forming FIG. 9(a) is a front view of a dimple formed under the conditions of Example 2, and FIG. 9(b) is a cross-sectional view of the dimple.

(Example 3)
In Example 3, dimple wall surface angle = 28.1°, P/D = 2.5, dimple area ratio = 13%, dimple diameter = 30 µm, dimple depth = 8 µm, and dimple pitch = 75 µm. forming FIG. 10(a) is a front view of a dimple formed under the conditions of Example 3, and FIG. 10(b) is a cross-sectional view of the dimple.

(Example 4)
In Example 4, the dimples 15 were formed under the following conditions: dimple wall angle = 39°, P/D = 3, dimple area ratio = 9%, dimple diameter = 10 µm, dimple depth = 4 µm, dimple pitch = 30 µm. there is FIG. 11(a) is a front view of a dimple formed under the conditions of Example 4, and FIG. 11(b) is a cross-sectional view of the dimple.

( Reference example )
In the reference example , the dimples 15 were formed under the following conditions: dimple wall angle=60°, P/D=3.04, dimple area ratio=8%, dimple diameter=23 μm, dimple depth=10 μm, dimple pitch=70 μm. ing. FIG. 12(a) is a front view of a dimple formed under the conditions of the reference example , and FIG. 12(b) is a sectional view of the dimple.

(Comparative example 1)
In Comparative Example 1, dimple wall surface angle = 17.7°, P/D = 1.6, dimple area ratio = 31%, dimple diameter = 25 µm, dimple depth = 4 µm, and dimple pitch = 40 µm. forming FIG. 13(a) is a front view of a dimple formed under the conditions of Comparative Example 1, and FIG. 13(b) is a cross-sectional view of the dimple.

(Comparative example 2)
In Comparative Example 2, the dimples 15 were formed under the following conditions: dimple wall angle = 8.1°, P/D = 5, dimple area ratio = 3%, dimple diameter = 14 µm, dimple depth = 2 µm, dimple pitch = 70 µm. is doing. FIG. 14(a) is a front view of a dimple formed under the conditions of Comparative Example 2, and FIG. 14(b) is a cross-sectional view of the dimple.

(Comparative Example 3)
In Comparative Example 3, the dimples 15 were formed under the following conditions: dimple wall angle=11°, P/D=1.75, dimple area ratio=26%, dimple diameter=40 μm, dimple depth=4 μm, dimple pitch=70 μm. is doing. FIG. 15(a) is a front view of a dimple formed under the conditions of Comparative Example 3, and FIG. 15(b) is a cross-sectional view of the dimple.

(Comparative Example 4)
In Comparative Example 4, the dimples 15 were formed under the following conditions: dimple wall angle=90°, P/D=3.5, dimple area ratio=6%, dimple diameter=20 μm, dimple depth=4 μm, dimple pitch=70 μm. is doing. FIG. 16(a) is a front view of a dimple formed under the conditions of Comparative Example 4, and FIG. 16(b) is a cross-sectional view of the dimple.
9 to 16 do not necessarily represent the dimensions of the dimples to scale.

In the life evaluation, a new traveler 12 was attached to each ring 11 having dimples 15 formed under different conditions as described above, and the life of the traveler 12 was confirmed by an actual machine test. The actual machine test was carried out under dry conditions using a ring spinning machine (RX240) manufactured by Toyota Industries Corporation, setting the number of revolutions of the spindle to 21000 rpm. The spindle supports the bobbin and rotates together with the bobbin. The life of traveler 12 was determined based on the wear level of traveler 12 . Specifically, when the thickness of the traveler 12 was reduced to half of the initial thickness of the traveler 12 at the start of the practical test, it was determined that the traveler 12 had reached the end of its life.

In addition, regarding the life evaluation, when the ring 11 without the dimples 15 was used in the actual machine test, the traveler sliding distance until the traveler 12 reached the end of its life was set to the reference distance L (km). Then, actual machine tests were conducted for each of Examples 1 to 4, Reference Examples, and Comparative Examples 1 to 4, and the traveler sliding distance obtained for each example and each comparative example was divided by the reference distance L described above. The result was defined as the life ratio.

As can be seen from FIG. 7, in Examples 1 to 4 and Reference Example , condition 1 is that the dimple wall surface angle θ is 10° or more and 65° or less, and the value of P/D is 1.9 or more and 4.5. Both conditions 2 below are satisfied. On the other hand, Comparative Examples 1 and 3 satisfy Condition 1 but do not satisfy Condition 2. Comparative Example 2 does not satisfy both Condition 1 and Condition 2. Comparative Example 4 satisfies Condition 2 but does not satisfy Condition 1.

On the other hand, with respect to life, the life ratios of Comparative Examples 1 to 4 are all 1. Therefore, even if the dimples 15 are formed under the conditions of Comparative Examples 1 to 4, the life of the ring/traveler system cannot be extended. In particular, when the value of P/D is smaller than 1.8 as in Comparative Examples 1 and 3, even if the dimple wall surface angle .theta. Also, when the value of P/D is greater than 4.5 as in Comparative Example 2, it can be seen that the life of the traveler 12 is not extended. Therefore, in order to extend the life of the traveler 12, it is necessary to keep the value of P/D within the range of 1.9 or more and 4.5 or less.

On the other hand, the life ratios of Examples 1 to 4 and Reference Example are 2 or more. Therefore, if the dimples 15 are formed under the conditions of Examples 1-4 and Reference Example , the life of the ring/traveler system can be doubled or more as compared with Comparative Examples 1-4. In particular, when the dimples 15 are formed under the conditions of dimple wall surface angle=21.8° and P/D=2.5 as in Example 2, the life of the traveler 12 is extended by 3.3 times. In addition, when the dimples 15 were formed under the conditions of Examples 1 to 4 and Reference Example , the deposits generated during spinning slid at a coverage of 50% or more, and further a coverage of 80% or more. It is presumed that the ring/traveler system has a longer service life because it spreads thinly on the surface.

Also, deposits generated during spinning are temporarily stored in the dimples 15, but if the depth of the dimples 15 is too shallow at that time, the amount of deposits stored in the dimples 15 may be insufficient. There is Therefore, the dimple depth S is preferably 2 μm or more, more preferably 4 μm or more, and even more preferably 6 μm or more. However, if the depth of the dimples 15 is too deep, there is a concern that deposits will be difficult to resupply to the sliding surface. Therefore, it is preferable that the dimple depth S satisfies the condition of 20 μm or less.

On the other hand, looking at the relationship between the dimple diameter and the life ratio in Examples 1 to 4 and Reference Example , the life ratio was 2 or more under the condition that the dimple diameter D was 10 μm or more and 60 μm or less. In Examples 2 and 3, which satisfy the condition that the diameter D is 30 μm or more and 60 μm or less, the life ratio is 2.3 times or more. Therefore, the dimple diameter D is preferably 10 μm or more and 60 μm or less, more preferably 30 μm or more and 60 μm or less.

Comparing the dimple area ratios of Comparative Examples 1 to 4 with those of Examples 1 to 4 and Reference Example , the dimple area ratio of Comparative Examples 1 and 3 exceeds 20%, and the dimple area ratio of Comparative Example 2 is 3%. On the other hand, the dimple area ratios of Examples 1 to 4 and Reference Example satisfy the condition of 4% or more and 20% or less. The life ratios of Examples 1 to 4 and Reference Example are more than double those of Comparative Examples 1 to 4, and in particular, the life ratios of Examples 2 and 3 are more than 2.3 times. there is Therefore, the dimple area ratio is preferably 4% or more and 20% or less, more preferably 10% or more and 15% or less.

<Effects of Embodiment>
In the embodiment of the present invention, the plurality of dimples 15 formed on the sliding surface between the ring 11 and the traveler 12 satisfy the condition that the dimple wall surface angle θ is 10° or more and 65° or less, and the P/D value satisfies the condition of 1.9 or more and 4.5 or less. As a result, deposits generated during spinning are easily stored in the dimples 15, and the stored deposits are easily resupplied to the sliding surface. As a result, the lubricating function of the deposits can be maintained satisfactorily, and the wear of the ring/traveler system parts can be greatly reduced. Therefore, according to this embodiment, the shape and arrangement of the dimples formed on the sliding surface between the traveler and the ring can be optimized, and the life of the ring/traveler system can be further extended.

<Modifications, etc.>
The technical scope of the present invention is not limited to the above-described embodiments, but also includes forms with various modifications and improvements within the range where specific effects obtained by the constituent elements of the invention and their combinations can be derived.

For example, in the above-described embodiment, an example in which the plurality of dimples 15 are arranged in a zigzag pattern has been shown, but the present invention is not limited to this, and the plurality of dimples 15 may be arranged in a grid pattern, for example.

In addition, the yarn to be spun is not limited to cotton, and may be, for example, hemp, silk, wool, or chemical fiber (rayon, nylon, vinylon, fleece). Considering that, cotton and hemp are preferable.

Further, the ring 11 constituting the ring/traveler system is not limited to having the flange 11a with a T-shaped cross section, and may have, for example, an inclined flange. In that case, a traveler shaped to fit the slanted flange would be used.

Further, in the above-described embodiment, an example of forming the plurality of dimples 15 by laser processing is shown, but the present invention is not limited to this, and other processing methods such as press processing, drill processing, etching processing, etc. may be applied. good.

11 ring, 12 traveler, 14 periodic structure (sliding surface), 15 dimple, D dimple diameter (open end diameter), S dimple depth, θ dimple wall angle.

Claims (4)

In a ring/traveler system of a ring-type spinning machine that slides in a non-liquid lubrication environment, a plurality of dimples each having a circular open end are formed on the sliding surface between the traveler and the ring when the traveler slides,
The plurality of dimples satisfy the condition that the dimple wall surface angle is 11.3 ° or more and 39 ° or less, the arrangement pitch of the plurality of dimples on the sliding surface is P (μm), and the diameter of the open end of the circular shape is satisfied. is D (μm), the value of P/D is 2.5 or more 3 . 5. A ring/traveler system for a ring spinning machine , wherein the plurality of dimples has a cross-sectional shape of any one of mortar-shaped, conical and trapezoidal . 2. The ring/traveler system of the ring spinning machine according to claim 1, wherein the plurality of dimples satisfy a condition that the diameter of the circular opening end is 10 [mu]m or more and 60 [mu]m or less. 3. The ring/traveler system of the ring spinning machine according to claim 1, wherein the plurality of dimples satisfies a condition that the dimple depth is 2 [mu]m or more and 20 [mu]m or less . The ring/traveler of the ring spinning machine according to any one of claims 1 to 3, wherein the plurality of dimples satisfy a condition that a dimple area ratio on the sliding surface is 4% or more and 20% or less. system.

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