JPH0665879A - Spiral wave forming pin - Google Patents

Abstract

PURPOSE:To control contact resistance between a spiral wave forming pin providing a linear material such as metal filament with a spiral wave and the linear material and to extremely improve the wear life of the pin. CONSTITUTION:A cylindrical material is provided with a circumferential groove 12 having a U-shaped section at a position close to the one end. The material of the wave forming pin 11 is made of a hard metal and the surface of the circumferential groove is supplied with a wear-resistant hard coating film.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spiral corrugated pin used for a metal cord used for reinforcing rubber articles such as automobile tires, conveyor belts and high pressure hoses, and a preforming device for metal filaments.

[0002]

2. Description of the Related Art Conventionally, as a spiral corrugating pin used in a preforming device for a metal cord and a metal filament, as shown in FIG. 4, a thin hard steel wire is cut into a certain length or a needle bearing. The needle obtained by disassembling is used as a substitute for the pin.

The conventional spiral corrugating pin 1 as described above has a small-diameter columnar shape, and its surface has a small contact resistance with the linear body 3 such as a metal filament to improve wear resistance. Those having a hard coating 2 such as hard chrome plating are used.

For a relatively large shape such as a flyer guide of a buncher twisting machine, which has a slightly different use, for example, Japanese Utility Model Publication No. 1-44203 and Japanese Utility Model Publication No. 1-1.
As disclosed in Japanese Patent No. 10296, it is disclosed that the flyer guide surface is subjected to surface treatment such as hard chrome plating, tufftride treatment, and TiC coating. Similarly, Japanese Patent Publication No. 57-27238 discloses a double stranding machine, and one example of its revolution guide uses a guide pin as a protrusion, and its shape is cylindrical. It is disclosed that the material is a material having wear resistance such as alumina porcelain and cemented carbide.

[0005]

Conventionally, the material of the corrugated pin of this type has the same hardness as that of the metal filament for steel cord to be corrugated, from the viewpoint of the hardness having a correlation with the wear resistance. Hard steel wire is often used, and if it is used without surface coating, it will wear in a short period of time due to contact between the pin and the metal filament. Therefore, those described in the above-mentioned Japanese Utility Model Publication No. 44203 / Japanese Utility Model Publication No. 1-1102.
As disclosed in Japanese Patent Publication No. 96, it is considered to perform various surface coating treatments. An important point in these treatments is the pin material (base material), the coating material, and the thermal expansion coefficient of both.

That is, when surface-treating a carbide having a high hardness, the base material is heated to a large extent in order to improve the peeling resistance, so that the base material softens if the temperature is higher than the tempering temperature of the base material. Then, the wear resistance may be lower than that in the case where the surface treatment is not performed.

The hardness of the coating material is larger and the thickness is larger, the wear resistance is improved. On the other hand, if the difference in the coefficient of thermal expansion between the two materials is large, strain is generated and peeling easily occurs. There is.

In addition, the base material and the coating material should be determined in consideration of the longitudinal elastic moduli of the both depending on the operating temperature and stress conditions. However, these matters are not described in the proposals described in the above three publications.

Further, the smaller the diameter of the corrugating pin,
Larger corrugations are possible with a linear body such as a metal wire under certain conditions, but if the pin shape is cylindrical, making the diameter thinner will make the pin easier to bend. The lower limit is 0.0 to 3.0 mm. Therefore, in order to obtain a predetermined waveform, it is necessary to increase the amount of bending strain of the linear body such as a metal filament due to the pin, which increases the contact resistance between the two and accelerates the wear of the pin or the metal filament. There was a problem such as scratching the linear body.

An object of the present invention is to solve the above-mentioned problems of the prior art and to suppress the contact resistance with a linear body such as a metal filament and to efficiently corrugate the linear body. Moreover, it is an object of the present invention to provide a spiral corrugated pin that can significantly extend the wear life.

[0011]

In order to solve the above-mentioned problems, the spiral corrugated pin of the present invention has a circumferential groove having a U-shaped cross section which is formed on a part of a cylindrical base material made of cemented carbide. Is formed into a mossy shape, and at least the surface of the above-mentioned circumferential groove is provided with a wear-resistant hard coating.
In the case of a cemented carbide having a range of 86 to 95% by weight and a Co amount of 5 to 13% by weight, or when the diameter of the metal filament processed by this spiral corrugating pin is in the range of 0.15 mm to 0.4 mm, the spiral wave The diameter of the bottom of the peripheral groove of the attachment pin is in the range of 1.2 mm to 1.9 mm.

Further, before and after the step of applying the wear-resistant hard coating to the surface of the peripheral groove of the spiral corrugating pin, the surface roughness of this groove is adjusted to about 1.0 S by lapping, and the peripheral groove of the spiral corrugating pin is provided. The material of the wear resistant hard coating on the surface is TiC or TiCN, TiN, WC, and the average film thickness is 3 to 10
In the range of μm or the material of the wear-resistant hard coating on the circumferential groove surface of the spiral corrugated pin is WC and its average film thickness is 10 μm
Those above are also adopted.

[0013]

A plurality of the above-mentioned spiral corrugating pins are mounted on the side surface of the mounting portion at the front part of the rotary shaft of the rotary corrugating device, and a metal filament passed from the rear through a guide hole penetrating the center of the rotary shaft from the front part. After being drawn out and applied to the opposite side of each circumferential groove of the plurality of spiral corrugating pins in a wavy shape, it is wound by a take-up reel.

Then, while the metal filament is being wound by the take-up reel, the rotating shaft is rotated to give a spiral corrugation to the metal filament.

The above operation will be described in more detail with reference to the examples shown in FIGS. 2 and 3. The pin 11 has a cylindrical shape as shown in FIG. 1, and has a U-shaped cross-section circumferential groove 12 near one end thereof. To make a mossy shape.

As shown in FIG. 2, the rotary wave attaching device 9 supports the rotary shaft 6 by a bearing 7 fixed to a frame, and its rotation is externally transmitted through a drive pulley 5 at the rear end of the rotary shaft 6. It is performed by a drive source such as a motor. The linear body 3 such as a metal filament is guided by a guide hole 4 that penetrates the center of the rotation shaft.

A mounting portion 10 for a spiral corrugating pin is integrally provided on the front portion of the rotary shaft 6, and three pins 11 are mounted on the side surface thereof.

The pins 11 are orthogonal to the axis of the rotary shaft 6, the pins 11 are arranged in a zigzag manner as shown in FIG. 2, and the centers of the circumferential grooves 12 are the guide holes 4 as shown in FIG. Position it so that it is on the extension of the center line.

The linear body 3 is guided from the rear end of the rotary shaft 6 into the guide hole 4, and is applied from the front end of the guide hole 4 to the circumferential groove 12 of each pin 11 so as to have a wavy shape. It is taken up by a take-up reel.

Accordingly, when the rotary shaft 6 is rotated and the linear body 3 is wound and moved in the direction of the arrow, the pins 11 rotating with the rotary shaft 6 add bending, strain, and twist due to rotation to the linear body 3. A linear body 14 such as a spirally and finely corrugated metal filament is obtained.

After that, it becomes a metal cord made by being twisted with another metal filament which is not corrugated,
Alternatively, without twisting, the product may be wound as it is after passing through a false twisting device to remove a certain amount of twist, and then wound into a single metal filament product.

As described above, the corrugating pin 11 imparts bending strain and twist to the linear body such as a metal filament. Therefore, conversely, the corrugating pin 11 is polished by the linear body 3 under severe conditions. Therefore, the material needs to be particularly excellent in wear resistance.

Since the base material of the corrugated pin 11 is in a relatively high temperature range when surface-treating carbide or the like, the hardness can be returned to the original level by reheating after the surface treatment so that the treated layer does not peel off. In addition, we chose cemented carbide, which has the highest possible hardness.

As a result of various tests conducted therein, it was found that the WC content of the component was preferably 86 to 94% by weight and Co was 5 to 13% by weight. If the WC amount is 85% by weight or less, the wear resistance gradually decreases, and if the WC amount is 95% by weight or more, the amount of Co decreases by that amount, which easily causes chipping or breakage, which causes a problem.

Further, the corrugated pin 11 is provided with the peripheral groove 13 having a U-shaped cross section to form a mosquito-like shape, because corrugating a linear body such as a metal filament is more efficient as the pin diameter is smaller. Only the contact part has a required diameter, and the other parts have a mossy shape from the viewpoint of ensuring rigidity, and the bottom part of the circumferential groove 13 is a metal filament with a diameter of 0.15 to 0.40 mm which is commonly used for steel cords. The diameter of 1.
The range is 2 to 1.9 mm. If this diameter is less than 1.2 mm, it is easy to break when an abnormal impact such as disconnection is applied,
If the thickness is 2.0 mm or more, the amount of bending strain of the linear body such as the metal filament due to the pin must be increased in order to secure a certain wavy shape, which increases the contact resistance between the two and premature wear of the pin. It also causes It may be selected within the above range according to the diameter of the linear body 3 such as a metal filament.

Next, in order to dramatically improve the wear resistance of the circumferential groove 13 of the U-shaped cross section of the corrugated pin 11, it is effective to apply a surface treatment using a material having a hardness higher than that of the cemented carbide. Is.

Therefore, TiC and T, which have a hardness about twice as high as that of the cemented carbide as the base material, are used as the coating material with emphasis on wear resistance.
iCN was chosen. The thickness of these coatings should be as thick as possible, but since both coating materials have slightly different coefficients of thermal expansion from the cemented carbide as the base material, strain is a concern, and it is considered that the maximum is 10 μm.

Therefore, it is necessary to lap the surface of the base material before the surface treatment so as to have a surface roughness of about 1.0 S so that a uniform film thickness layer can be obtained. The same degree of wrapping is required to prevent the surface of the linear body from being scratched. In this case, the film thickness of 3 to 10 μm is sufficient.

On the other hand, the hardness of the coating material is TiC and Ti.
WC, which is slightly lower than CN and higher than cemented carbide, occupies most of the components of the base material. In this case, since there is no difference in the coefficient of thermal expansion, the film thickness can be made considerably large.
It has been found that the wear resistance equivalent to that of the above-mentioned material can be expected by setting it to be n or more, but 10 to 20 μm is economically preferable.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the corrugated pin 11 of the present invention will be described below with reference to FIG.

In FIG. 1, the lower portion of the corrugated pin 11 has a diameter of 3 mm in order to ensure rigidity, and the peripheral groove 1 having a U-shaped cross section.
2 is a mossy shape with a radius of curvature of 1 mm and a groove bottom diameter of 1.5 mm, and a TiC coating with a thickness of 8 μ around the peripheral groove 12.
m (Example 1), the same base material is TiCN
A coating having a film thickness of 7 μm (Example 2) and a WC coating as a base material having a film thickness of 16
What was applied to μm (Example 3) was mirror-polished. As a comparative example, a piano wire (JISG3502 SWRS72
A TiC coating having a film thickness of 7 μm (comparative example 1) was used for A (corresponding to A) (comparative example 1) and a cemented carbide was not coated (comparative example 2). Using these corrugating pins, a metal filament having a diameter of 0.27 mm was passed through a rotating corrugating device and tested. The results are shown in Table 1.

[0032]

[Table 1]

As can be seen from Table 1 above, according to the present invention, the contact resistance between the pin and the metal filament can be reduced, the corrugated shape (especially the corrugated height) can be efficiently obtained, and the wear life of the pin is significantly increased. Can be improved.

[0034]

As described above, since the spiral corrugated pin of the present invention can be reduced in diameter, it is possible to suppress the contact resistance with a linear body such as a metal filament, and to attach it to a linear body such as a metal filament. Not only can the corrugation be performed efficiently, but the wear life of the corrugated pin can be significantly extended. Therefore, it is possible to corrugate some metal filaments before twisting the metal cords, or after corrugating one metal filament. When used for commercialization, high quality products can be obtained for a long period of time.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment.

FIG. 2 is a partially longitudinal side view of the same use condition as above.

FIG. 3 is a partially longitudinal plan view of the same as above.

FIG. 4 is a perspective view of a conventional example.

[Explanation of symbols]

 11 Spiral wave attaching pin 12 Circumferential groove

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[Procedure amendment]

[Submission date] June 3, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 2

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

[0011]

In order to solve the above-mentioned problems, the spiral corrugated pin of the present invention has a circumferential groove having a U-shaped cross section which is formed on a part of a cylindrical base material made of cemented carbide. Is formed into a mossy shape, and at least the surface of the above-mentioned circumferential groove is provided with a wear-resistant hard coating.
86-9 4 wt%, or a cemented carbide in the range of Co content 5 to 13% by weight, in a range diameter of the metal filaments processed by the helical corrugation pin is 0.15 mm to 0.4 mm, the helix The diameter of the bottom of the circumferential groove of the corrugated pin is set in the range of 1.2 mm to 1.9 mm.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Change

[Correction content]

[0020] Thus by moving the rotary shaft 6 wound with an arrow direction linear member 3 is rotated, the torsion by bending strain Mito rotating the linear body 3 by the pin 11 rotating together with the rotating shaft 6 In addition, a linear body 14 such as a spiral and finely corrugated metal filament is obtained.

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0029

[Correction method] Change

[Correction content]

On the other hand, the hardness of the coating material is TiC and Ti.
WC, which is slightly lower than CN and higher than cemented carbide, occupies most of the components of the base material. In this case, since there is no difference in the coefficient of thermal expansion, the film thickness can be made considerably large.
It has been found that when the thickness is at least m, wear resistance equivalent to that of the above-mentioned material can be expected, but economically 10 to 20 μm is preferable.

Claims (6)

[Claims] 1. In a corrugating pin for imparting spiral corrugation to a metal filament, a peripheral groove having a U-shaped cross section is formed over a whole circumference in a part of a cylindrical base material made of cemented carbide to form a mossy shape. None, a spiral corrugated pin having at least the surface of the circumferential groove coated with a hard wear resistant coating. 2. The material of the spiral corrugating pin is WC amount: 8
The spiral corrugated pin according to claim 1, which is a cemented carbide in the range of 6 to 95% by weight and a Co content of 5 to 13% by weight. 3. The diameter of the bottom of the circumferential groove of the spiral corrugating pin is 1. When the diameter of the metal filament processed by the spiral corrugating pin is in the range of 0.15 mm to 0.40 mm.
The spiral corrugating pin according to claim 1 or 2, wherein the pin has a range of 2 mm to 1.9 mm. 4. The surface roughness of the groove is set to about 1.0 S by lapping before and after the step of applying a wear resistant hard coating on the surface of the circumferential groove of the spiral corrugating pin. Pin with spiral wave. 5. The spiral corrugated pin according to claim 1, wherein the material of the wear-resistant hard coating on the surface of the circumferential groove of the spiral corrugated pin is TiC or TiCN and the average film thickness is in the range of 3 to 10 μm. . 6. The spiral corrugating pin according to claim 1 or 2, wherein the material of the wear-resistant hard coating on the circumferential groove surface of the spiral corrugating pin is WC and the average film thickness is 10 μm or more.