JP2005312709A - Adjustment pin for connecting and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide adjustment pins for connecting having good inserting and removing characteristics, good workability and stable quality, and preventing coming off in use, and also to provide a manufacturing method thereof. <P>SOLUTION: The adjustment pin 6 for connecting is formed in a simple curved shape by using an elastic material so that the curved shape is elastically deformed into a linear shape by inserting it into a block hole, and that elastic stress is applied to an inner wall of the block hole so as to generate a tightening force. The entire pin is formed in a curved shape so as to secure a great displacement quantity at the time of elastic deformation, and to absorb effects caused by dispersion of dimensions of the block holes. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a connection adjusting pin and a method for manufacturing the same, and more particularly to a connection adjusting pin suitable for use in a watch band, an accessory, and the like, and a method for manufacturing the same.

  In general, a metal wristwatch band is constituted by a block provided with a hole in a metal or the like and a pin such as stainless steel. A cotter pin is inserted into the hole of the block and connected, and the band moves along the wrist by moving the block with the cotter pin as a fulcrum. These bands consist of two bands, and are fixed with metal fittings attached to the ends when attached to the wrist.

  It is necessary to adjust the length of the metallic wristwatch band depending on the thickness of the wrist to be worn, and it is adjusted by the number of blocks. First, remove the pin, add or remove the block, and insert the pin again. In addition, there is a mechanism in which a metal fitting at the end is provided with a mechanism that allows fine adjustment. There are various types of pins connecting the blocks depending on the design of the band.

  This application such as a pin for connecting blocks is a typical example of the adjusting pin for connection of the present invention. For example, Patent Document 1 describes an adjustment pin for connecting a hairpin-shaped watch band. 2A and 2B are views showing a conventional wristband connecting pin. FIG. 2A is a top view, FIG. 2B is a side view, and FIG. 2C is a front view. FIG. 3 is an explanatory view showing an example in which a conventional connecting adjustment pin is used for a wristwatch band.

  The connecting adjustment pin 1 that is normally used is a hairpin shape in which a wire material obtained by bending a part of a stainless steel wire having a semicircular cross section into a chevron is bent into a U shape. The chevron-shaped bending portion 2 is provided symmetrically on the U-shaped bent side, and when it is inserted into the wristwatch band block 3, the chevron portion (the bending portion 2) is compressed and deformed, and the chevron is formed on the inner wall of the block hole. The mold part is subjected to elastic stress to prevent it from coming off.

  The connecting adjustment pin is easy to insert and remove, and it is important that the connecting adjusting pin does not come off during use, and durability is often required. Therefore, many improvements have been made so far. For example, Patent Document 2 describes using a shape memory alloy as a material. Further, Patent Document 3 describes a connection adjusting pin having a shape obtained by locally bending a superelastic wire.

Japanese Utility Model Publication No. 6-7513 JP 58-27505 A WO99 / 65354 republished patent gazette

  The connection adjusting pin as shown in FIG. 1 has a manufacturing problem that the portion bent into a U-shape is easily broken, and the mountain-shaped portion is plastically deformed by repeated insertion and removal, thereby improving elasticity. There was a drawback of losing. Further, due to variations in the width dimension of the chevron and the block hole diameter, there are problems that it is difficult to insert at the time of pin insertion in the band assembling process and that the pin is difficult to be removed when adjusting the length of the band. In addition, when the fixing strength of the pin is loose, there is a disadvantage that it is detached during use.

  The adjustment pin for connecting a wristwatch band using the shape memory alloy of Patent Document 2 uses a shape memory effect due to temperature to improve the insertion / extraction, but has a difficulty in processing. Moreover, the technical idea using superelasticity is not described.

  Further, the connecting adjustment pin obtained by bending the superelastic wire of Patent Document 3 is bent locally, and the plastic elastically deformed by applying a stress exceeding the superelastic region and heat-treating. It is formed by. The insertion and removal properties and the machined surface have been improved, but since bending is performed locally, the stress tends to concentrate on the bent part, which tends to be the starting point of fatigue failure, and the distortion is caused by heat treatment after plastic deformation. Since it is released, there is a problem that the dimension of the bending process changes and the quality varies.

  Therefore, the technical problem of the present invention is to provide an adjustment pin for connection and a method for manufacturing the same that have good insertability, are difficult to come off during use, have good workability, and have a stable quality. .

  In order to solve the above-mentioned problems, in the present invention, a curved shape is elastically deformed linearly when inserted into a block hole by using an elastic material for the connecting adjustment pin and making it a curved simple shape. Then, an elastic stress is applied to the inner wall of the block hole so that a fastening force is obtained. By making the entire curved shape so that the amount of displacement during elastic deformation can be increased, the influence of dimensional variations of the block holes is also suppressed.

  That is, according to the present invention, it is possible to obtain a connecting adjustment pin made of a linear elastic alloy or a superelastic alloy and having a curved shape as a whole.

  Moreover, according to this invention, the adjustment pin for a connection with which a superelastic alloy has a superelastic property at least within the temperature range of -40-80 degreeC is obtained.

  Further, according to the present invention, the superelastic alloy is 50 to 51 at% Ni and the balance Ti, or 49.5 to 51 at% Ni, 0.1 to 2 at% X (where X is Cr, V, Co, Fe, An adjustment pin for connection composed of at least one of W, Mo, Pd, Cu, Mn, and Zr) and the balance Ti is obtained.

  Furthermore, according to the present invention, there is provided a method of manufacturing a connecting adjustment pin having a curved shape of a linear elastic alloy or superelastic alloy, wherein the curved shape performs a step of bending the wire and a cutting step. The manufacturing method of the adjustment pin for connection formed by this is obtained.

  In addition, according to the present invention, there is provided a method for manufacturing a substantially curved asus pin of an elastic alloy or a superelastic alloy, wherein the curved shape is formed by coiling into a coil spring shape and then cut and formed. An adjustment pin manufacturing method is obtained.

  In addition, according to the present invention, there can be obtained a method of manufacturing a connecting adjustment pin that is subjected to heat treatment to memorize the shape after bending or coiling the superelastic material.

  In the present invention, the above-described configuration makes it possible to provide a connecting adjustment pin that is easier to insert during assembly than the conventional case, has excellent insertion / removability that is easy to pull out during adjustment, has a stable fastening strength, and is difficult to come off during use. Can get. Further, the strength is improved and the durability is improved as compared with the conventional stainless steel pin. Furthermore, according to the present invention, it is possible to provide a connection adjusting pin and a method for manufacturing the same that require only a relatively small number of manufacturing steps, are relatively easy to process, and are advantageous in terms of manufacturing cost.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view showing an example in which a connecting adjustment pin according to the present invention is used for a wristwatch band block.

  As shown in FIG. 1, the connecting adjustment pin 6 of the present embodiment is a linear one that is curved as a whole. The linear elastic alloy is processed so as to have a curved shape as a whole. As shown in FIG. 1, by inserting the connecting adjustment pin 6 so that the concave and convex portions of the wristwatch band block 3 are aligned, adjacent blocks are continuously connected by the connecting adjusting pin. It can be fastened and constitutes a band-like band shape.

  In the case of the adjustment pin 6 for connection according to the present embodiment, even if there is a variation in dimensions in the through hole of the wristwatch band block 3, the entire shape is curved, so that the displacement is large and elastic deformation is performed along the through hole. Thus, elastic stress is applied to the inner wall of the block hole to prevent the block hole from coming off.

  In the case of the connecting adjustment pin 6 of the present embodiment, the whole has a curved shape, and since it is not a local bending process, stress concentration hardly occurs, which is advantageous in terms of fatigue failure, High durability. In addition, the connecting adjustment pin of the present embodiment has the same effect even if the cross section of the wire is a round wire or a deformed wire if the whole is a curved elastic alloy wire. Select the one that is easy to do.

  Since the elastic alloy used for the connecting adjustment pin of this embodiment is often used at the daily use temperature, it is preferable to use an elastic alloy having elastic characteristics at the daily use temperature. An elastic alloy having superelastic properties is suitable because it can take a large amount of variation and has good durability. Also in this case, those having superelastic characteristics in a temperature range of −40 to 80 ° C. are more suitable.

  Examples of the superelastic metal suitable for use in the connection adjusting pin of the present embodiment include 50 to 51 at% Ni and the remaining Ti, or 49.5 to 51 at% Ni, 0.1 to 2 at% X ( However, X is Ti-Ni alloy such as Cr, V, Co, Fe, W, Mo, Pd, Cu, Mn, Zr) and the balance Ti. This Ti—Ni alloy is not only excellent in strength and superelastic properties, but also has good durability and corrosion resistance, and is a relatively readily available material.

  The connecting adjustment pin of the present embodiment is suitable for use in a wristwatch band or an accessory, and the wristwatch band or accessory using the connecting adjustment pin is easily adjustable in length and excellent in durability. It will be.

  As a method of manufacturing the connection adjusting pin of the present embodiment, the elastic alloy wire may be processed so as to be entirely curved so as not to be localized. If it is a normal wire rod, it can be curved by simply passing it through a roll, but in the case of an elastic alloy, there are difficult surfaces, so it is better to plastically deform it using a bending mold. More specifically, it may be manufactured by a method as shown in FIG.

  FIG. 4 is an explanatory view of a method of manufacturing the adjusting pin for connection according to the present embodiment. FIG. 4A is a diagram in which a superelastic wire is coiled into a jig and restrained, and FIG. Fig. 4 (c) shows a shape memory heat treatment and the jig is removed, Fig. 4 (c) shows a coiled volume cut into product lengths, and Fig. 4 (d) shows a curved connection according to the present embodiment. It is a figure of a use adjusting pin.

  First, as shown in FIG. 4A, while applying tension to the wire rod, plastic processing is performed in a substantially coil shape by coiling that tightly winds the round rod of the jig, and both ends of the wire rod are fixed to the round rod. . Next, shape memory heat treatment is performed to fix the shape by heating the wire to remove the strain. When a superelastic alloy is used, this heat treatment also determines the superelastic characteristics, and is preferably in the temperature range of 400 ° C to 600 ° C. Thereafter, when the round bar of the jig is removed, a coil as shown in FIG. 4B is obtained. The coupling adjusting pin 6 can be obtained by cutting the coil into a predetermined length.

  At this time, by changing the diameter of the round bar of the jig, it is possible to manufacture a connecting adjustment pin having a curved shape with a desired curvature according to the block hole diameter and the like. Further, heat treatment to superelasticity or the like may be performed with the shape fixed. According to this method, it is possible to manufacture a connecting adjustment pin having a certain quality in size, shape, etc. relatively easily and at a relatively low cost.

  A Ti-50.5 at% Ni alloy obtained by high-frequency vacuum melting was formed into a wire having a diameter of 8 mm by a hot hammer and a hot roll. This wire was repeatedly subjected to cold drawing and soft annealing to obtain a wire having a diameter of 1 mm and finished with cold drawing (processing rate: 40%).

  The wire rod was tightly wound around a round bar while spirally applying tension, and the beginning and end of winding of the wire rod were fixed to the round bar. Further, the round bar wound with the wire was subjected to shape memory heat treatment at a temperature of 500 ° C. for 30 minutes, and the wire was removed from the round bar to obtain a coil spring-shaped superelastic wire. Next, the wire rod memorized in the coil spring shape was cut into a length of 18 mm in arc length, and a curved superelastic adjustment pin 1 was obtained.

  At this time, adjustment pins for coupling with various arc radii were manufactured, and the load when inserting and removing the watch band into the block hole φ1.2 mm for each arc radius was measured, and the measurement results are shown in Table 1. It was shown to. For comparison, the measurement results of the conventional stainless steel product shown in FIG. 2 are also shown. The smaller the insertion load, the better the workability during assembly. On the other hand, the larger the extraction load is, the more difficult it is to remove, but it is difficult to remove at the time of adjustment.

  As shown in Table 1, the load decreases as the arc radius increases. In the conventional product, the load is large because the portion of the chevron that has been bent is compressed and deformed. Further, the load varies greatly depending on the dimensions of the bent portion. In the product of the present invention, since the radial radius dimension is stable, the load is stable, so that the variation is small. Also, specifications with different block hole diameters can be handled by adjusting the arc radius.

  Next, Table 2 shows the tensile strength and Table 3 shows the torsion breaking strength of the curved connecting adjustment pin 1 according to the present invention and the conventional stainless steel pin (conventional product 1) as described above. As shown in FIG. 5, the tensile strength was measured by a fracture test method in which a wristband 8 having blocks connected by a connection adjusting pin was fixed by a fixing portion 7 of a testing machine, and a tensile stress was applied. The torsion breaking strength was measured by a breaking strength test method in which a wristband 8 having a block connected by a connecting adjustment pin as shown in FIG.

  As shown in Table 2, according to the product of the present invention, an average breaking strength of 1440 N was obtained. In the case of the conventional product 1 (stainless steel), it is 990 N on average, and it can be said that the product of the present invention is higher than the breaking strength required as a watch band.

  As shown in Table 3, according to the product of the present invention, it was possible to obtain a breaking strength of 290 N · cm equivalent to the strength required for the watch band of the conventional product 1 (stainless steel).

Explanatory drawing which shows the example which used the adjustment pin for connection of this invention for the wristwatch band. The figure which shows the adjustment pin for the connection of the conventional wristwatch band, FIG.2 (a) is a top view, FIG.2 (b) is a side view, FIG.2 (c) is a front view. Explanatory drawing which shows the example which used the conventional adjustment pin for connection for a wristwatch band. FIG. 4A is a diagram illustrating a method of manufacturing a connecting adjustment pin according to the present invention, FIG. 4A is a diagram in which a superelastic wire is coiled into a jig and restrained, FIG. 4B is a shape memory heat treatment, and the jig is removed. FIG. 4 (c) is a diagram in which one coiled coil is cut into product length, and FIG. 4 (d) is a diagram showing a curved connecting adjustment pin of the present invention. The figure which shows the fracture test method. The figure which shows the torsion fracture test method.

Explanation of symbols

1 Adjusting pin for connection (conventional product)
2 Bending part 3 Watch band block 4 Super elastic material 5 Jig 6 Adjusting pin for connection (product of the present invention)
7 Fixed part 8 Watch band

Claims (13)

  An adjustment pin for connection, which is made of a linear elastic alloy and has a curved shape as a whole.   The connection adjusting pin according to claim 1, wherein the elastic alloy has superelastic characteristics.   3. The connection adjusting pin according to claim 1, wherein the elastic alloy has at least an elastic property or a superelastic property within a temperature range of −40 to 80 ° C. 4.   The elastic alloy is 50 to 51 at% Ni and the balance Ti, or 49.5 to 51 at% Ni, 0.1 to 2 at% X (where X is Cr, V, Co, Fe, W, Mo, Pd, Cu The adjusting pin for connection according to claim 2, comprising at least one of Mn, Mr, and Zr) and the balance Ti.   A wristwatch band using the connection adjusting pin according to any one of claims 1 to 4.   An accessory using the connection adjusting pin according to any one of claims 1 to 4.   A method of manufacturing a connecting adjustment pin comprising a linear elastic alloy, the elastic alloy being curved in the length direction, wherein the curved shape is formed by performing at least one heat treatment. A method for manufacturing a connecting adjustment pin.   A method of manufacturing a connecting adjustment pin made of a linear elastic alloy, the elastic alloy being curved in the length direction, wherein the curved shape is formed by performing at least one plastic working. A manufacturing method of an adjustment pin for connection characterized by the above.   8. The method of manufacturing a connection adjusting pin according to claim 7, wherein the heat treatment is performed by restraining the elastic alloy in a curved state using a jig.   9. The method of manufacturing a connecting adjust pin according to claim 8, wherein the plastic working is performed on the elastic alloy using a bending mold.   11. The method for manufacturing a connecting adjust pin according to claim 7, wherein the elastic alloy has superelastic characteristics.   The elastic alloy is 50 to 51 at% Ni and the balance Ti, or 49.5 to 51 at% Ni, 0.1 to 2 at% X (where X is Cr, V, Co, Fe, W, Mo, Pd, Cu The method according to claim 11, comprising: at least one of Mn, Mr, and Zr) and the balance Ti.   The method of manufacturing an adjusting pin for connection according to any one of claims 7 to 10, wherein the elastic metal has at least an elastic property or a superelastic property within a temperature range of -40 to 80 ° C. .

Images