JP2014074585A - Timepiece component and manufacturing method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a timepiece component which achieves the improvement of a degree of freedom of manufacturing and the long-term maintenance of lubrication performance, and a manufacturing method of the timepiece component.SOLUTION: A timepiece component includes a base material 136, and a plated film 133 covering a surface of the base material 136. The plated film 133 has such porous structure that a number of micropores 134 exist over the whole of its surface layer and inside. The micropores 134 are spherical cavities, and each of them is formed in the same size. The micropores 134 of the plated film 133 retain a lubricating oil O inside by surface tension or capillarity. Thus, a whole side face of the base material 136, which includes a sliding surface of an escape wheel 132, functions as an oil retaining surface capable of retaining the lubricating oil O.

Description

  The present invention relates to a timepiece component and a method for manufacturing a timepiece component.

  A timepiece represented by a mechanical timepiece has a large number of timepiece components represented by a gear. These timepiece parts have various shapes depending on the application, and transmit power through a complex combination. In particular, the escape wheel, which is one of the gears, easily wears due to friction between the two because the claw stone of the ankle slides at a high speed with respect to the side surface. Therefore, in order to reduce friction as much as possible, it is necessary to keep lubricating oil on the sliding surface with the claw stone. Moreover, in order to prevent the lubricating oil from spreading to an extra portion, it is necessary to locally hold the lubricating oil on the sliding surface.

Thus, for example, the following techniques are known as solutions for such needs.
For example, Patent Document 1 discloses a configuration in which an anodic oxide film is formed on a sliding surface on which a claw stone slides, and the anodic oxide film is impregnated with a lubricant.
Patent Documents 2 and 3 disclose a configuration in which a plating film containing fine particles such as PTFE (polytetrafluoroethylene) which is a solid lubricant is formed on a sliding surface.
Furthermore, Patent Document 4 describes a configuration in which a escape wheel having an oil retaining hole is formed on a sliding surface by performing electroforming using a photoresist in which glass beads are dispersed as an electroforming mold.

JP 2010-261906 A JP 2010-256267 A JP-A-4-346692 JP 2010-261064 A

However, in the configuration of Patent Document 1 described above, the anodizing treatment is limited in the material of the base material that can be treated (for example, aluminum, magnesium, titanium, and alloys thereof), and therefore from the viewpoint of mechanical properties and workability. The degree of freedom in manufacturing is low, and the parts that can be adopted among various parts for watches are limited.
Moreover, in the structure of patent document 2, 3, PTFE used as a solid lubricant has a problem that wear resistance is low and life is short. In addition, there is a problem in that wear powder generated by wear is scattered in the watch, thereby promoting wear of the scattered portions and impairing the appearance.
In the configuration of Patent Document 4, since the oil retaining hole is formed only in the surface layer portion of the sliding surface, when the oil retaining hole is removed due to wear of the sliding surface, the lubricating oil retaining function is exhibited. become unable. In addition, since the timepiece part itself is formed by electroforming, there are restrictions on selection of materials and shapes, and in this case also, the degree of freedom in manufacturing is reduced.

  Therefore, an object of the present invention is to provide a timepiece component and a timepiece component manufacturing method capable of improving the degree of freedom of manufacture and exhibiting the lubricating performance over a long period of time.

  In order to solve the above-described problems, the timepiece component of the present invention has a base material and a plating film that coats the surface of the base material, and micropores are formed in the plating film. It is characterized by.

According to this configuration, since the micro holes are formed in the plating film, the lubricating oil can be uniformly held in the micro holes without unevenness. Further, since the lubricating oil is held in the micropores, the contact area between the lubricating oil and the outside air can be suppressed, and the volatilization of the lubricating oil can be suppressed.
In addition, since micropores are formed in the plating film, even if the plating film is worn, the micropores are sequentially exposed in the surface layer portion, and the lubricating oil is held in the exposed microholes. become. Thereby, depletion of lubricating oil can be suppressed and the lubricating performance can be reliably maintained over a long period of time. Therefore, the maintenance period can be extended.

In addition, the method for manufacturing a watch component of the present invention includes a plating step of forming a plating film on a base material, and the plating step immerses the base material in a plating solution in which fine particles are dispersed, The plating film containing fine particles is formed, and after the plating process, there is a removal step of removing the fine particles in the plating film.
According to this configuration, it is possible to form micropores in the plating film by removing the fine particles in the plating film. And by filling lubricating oil in these micropores, the above-described effects can be obtained.
In particular, since the base material is coated by plating, the material and shape can be freely selected, unlike the conventional method of coating the base material by anodic oxidation and the case where the watch parts themselves are manufactured by electroforming. The degree can be improved. Thereby, the freedom degree of manufacture can be improved.

The fine particles are made of a material having a boiling point lower than that of the base material and the plating film, and in the removing step, the plating is performed at a temperature not lower than the boiling point of the plating film and not higher than the boiling points of the base material and the plating film. The fine particles in the plating film are evaporated by heating the film.
According to this configuration, since only the fine particles can be evaporated without melting the base material and the plating film, the plating film having micropores can be easily formed.

The fine particles are polytetrafluoroethylene.
According to this configuration, since the particle diameter between the particles is relatively uniform, there is an effect that the size of the micropores to be formed later tends to be uniform.

  According to the timepiece part of the present invention and the manufacturing method thereof, the degree of freedom in manufacturing can be improved and the lubricating performance can be exhibited over a long period of time.

It is the top view which looked at the piezoelectric vibrating piece which concerns on this embodiment of this invention from one side. It is the top view which illustrated a part of movement back side. It is a general | schematic fragmentary sectional view which illustrates the part of an escape wheel from a barrel complete. It is a general | schematic fragmentary sectional view which illustrates the part of a balance with a escape wheel. It is a top view of an escape wheel and an ankle. It is the perspective view which expanded the tooth part of the escape wheel. It is sectional drawing of a escape wheel (a base material and a plating film). It is a flowchart for demonstrating the manufacturing method of a escape wheel. It is process drawing for demonstrating the manufacturing method of a escape wheel, Comprising: It is sectional drawing equivalent to FIG. It is process drawing for demonstrating the manufacturing method of a escape wheel, Comprising: It is sectional drawing equivalent to FIG. It is a photograph which shows the plating film after performing a removal process. It is sectional drawing of the base material for demonstrating the plating film at the time of abrasion progress, and a plating film. It is a conceptual diagram which shows an example of a mode that lubricating oil is hold | maintained in the newly exposed micropore. It is a conceptual diagram which shows an example of a mode that lubricating oil is hold | maintained in the newly exposed micropore.

Next, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, as an example of a timepiece part of the present invention, a escape wheel which is one of gears constituting a mechanical timepiece will be described as an example.
(Mechanical watch)
First, the mechanical timepiece will be described. FIG. 1 is a plan view of the movement front side. FIG. 2 is a plan view illustrating a part of the back side of the movement. FIG. 3 is a schematic partial cross-sectional view illustrating the portion from the barrel complete to the escape wheel. FIG. 4 is a schematic partial cross-sectional view illustrating the balance from the escape wheel and the balance.

As shown in FIGS. 1 to 4, the movement 100 of the mechanical timepiece has a base plate 102 constituting a substrate of the movement 100. A winding stem 110 is rotatably incorporated in the winding stem guide hole 102 a of the main plate 102. A dial 104 (see FIGS. 3 and 4) is attached to the movement 100.
In general, of both sides of the base plate 102, the side on which the dial 104 is arranged is referred to as the back side of the movement 100, and the opposite side of the side on which the dial 104 is arranged is referred to as the front side of the movement 100. Further, a train wheel incorporated on the front side of the movement 100 is referred to as a front train wheel, and a train wheel incorporated on the back side of the movement 100 is referred to as a back train wheel.

  The position of the winding stem 110 in the axial direction is determined by a switching device including the setting lever 190, the yoke 192, the yoke spring 194, and the back presser 196. The chisel wheel 112 is rotatably provided on the guide shaft portion of the winding stem 110. When the winding stem 110 is rotated in a state where the winding stem 110 is in the first winding stem position (0th stage) closest to the inside of the movement 100 along the rotation axis direction, the rotation of the pinion wheel 111 is rotated. The chic wheel 112 rotates through the wheel. The round hole wheel 114 is rotated by the rotation of the chichi wheel 112. Further, the square hole wheel 116 is rotated by the rotation of the round hole wheel 114. By rotating the square hole wheel 116, the mainspring 122 (see FIG. 3) accommodated in the barrel complete 120 is wound up.

  The center wheel & pinion 124 is rotated by the rotation of the barrel complete 120. The escape wheel (clock part) 130 rotates through the rotation of the fourth wheel 128, the third wheel 126, and the second wheel 124. The barrel wheel 120, the second wheel 124, the third wheel 126, and the fourth wheel 128 constitute a front wheel train.

The escapement and speed control device for controlling the rotation of the front train wheel includes a balance with hairspring 140, escape wheel 130 and ankle 142. As shown in FIG. 4, the balance with hairspring 140 includes a balance stem 140a and a hairspring 140c. As shown in FIG. 3, based on the rotation of the center wheel & pinion 124, the cylindrical pinion 150 rotates simultaneously. The minute hand 152 attached to the cylindrical pinion 150 displays “minute”.
Further, the cylindrical pinion 150 is provided with a slip mechanism for the center wheel & pinion 124. Based on the rotation of the hour pinion 150, the hour wheel 154 rotates through the rotation of the minute wheel. Then, the hour hand 156 attached to the hour wheel 154 displays “hour”.

As shown in FIG. 4, the hairspring 140 c is a thin leaf spring having a spiral (helical) shape having a plurality of winding numbers. The inner end portion of the hairspring 140c is fixed to a hair ball 140d fixed to the balance stem 140a. On the other hand, the outer end portion of the hairspring 140c is fixed by screw tightening through a hairspring 170a attached to a hairspring holder 170 fixed to the balance holder 166 (see FIG. 1).
The slow / fast needle 168 is rotatably attached to the balance holder 166. The balance with hairspring 140 is supported so as to be rotatable with respect to the main plate 102 and balance holder 166.

  As shown in FIG. 3, the barrel complete 120 includes a barrel complete gear 120 d, a barrel complete 120 f, and a mainspring 122. The barrel complete 120f includes an upper shaft portion 120a and a lower shaft portion 120b. The barrel complete 120f is formed of a metal such as carbon steel. The barrel gear 120d is formed of a metal such as brass.

  The center wheel & pinion 124 includes an upper shaft portion 124a, a lower shaft portion 124b, a pinion portion 124c, a gear portion 124d, and an abacus ball portion 124h. The pinion portion 124c of the center wheel & pinion 124 is configured to mesh with the barrel gear 120d. The upper shaft portion 124a, the lower shaft portion 124b, and the abacus ball portion 124h are made of a metal such as carbon steel. The gear portion 124d is formed of a metal such as nickel.

  The third wheel & pinion 126 includes an upper shaft portion 126a, a lower shaft portion 126b, a pinion portion 126c, and a gear portion 126d. The pinion 126c of the third wheel & pinion 126 is configured to mesh with the gear portion 124d of the second wheel & pinion 124.

  The fourth wheel & pinion 128 includes an upper shaft portion 128a, a lower shaft portion 128b, a pinion portion 128c, and a gear portion 128d. A pinion portion 128c of the fourth wheel & pinion 128 is configured to mesh with a gear portion 126d of the third wheel & pinion 126. The upper shaft portion 128a and the lower shaft portion 128b are formed of a metal such as carbon steel. The gear portion 128d is formed of a metal such as nickel.

The escape wheel & pinion 130 includes an upper shaft portion 130 a, a lower shaft portion 130 b, an escape gear portion 130 c, and an escape wheel portion 132. The escape portion 130 c is configured to mesh with the gear portion 128 d of the fourth wheel & pinion 128.
As shown in FIG. 4, the ankle 142 includes an ankle body 142d and an ankle true 142f. The ankle stem 142f includes an upper shaft portion 142a and a lower shaft portion 142b.

As shown in FIG. 3, the barrel complete 120 is rotatably supported by the main plate 102 and the barrel holder 160. That is, the upper shaft portion 120a of the barrel complete 120f is supported so as to be rotatable with respect to the barrel holder 160. The lower shaft portion 120b of the barrel complete 120f is supported to be rotatable with respect to the main plate 102.
The second wheel 124, the third wheel 126, the fourth wheel 128, and the escape wheel 130 are supported rotatably with respect to the main plate 102 and the train wheel bridge 162, respectively. That is, the upper shaft portion 124a of the center wheel & pinion 124, the upper shaft portion 126a of the third wheel & pinion 126, the upper shaft portion 128a of the fourth wheel & pinion 128, and the upper shaft portion 130a of the escape wheel & pinion 130 are respectively connected to the train wheel bridge 162. Is supported rotatably. The lower shaft portion 124b of the center wheel 124, the lower shaft portion 126b of the third wheel 126, the lower shaft portion 128b of the fourth wheel 128, and the lower shaft portion 130b of the escape wheel 130 are respectively connected to the main plate 102. And is rotatably supported.

  As shown in FIG. 4, the ankle 142 is rotatably supported with respect to the main plate 102 and the ankle receiver 164. That is, the upper shaft portion 142 a of the ankle 142 is supported so as to be rotatable with respect to the ankle receiver 164. The lower shaft portion 142 b of the ankle 142 is supported so as to be rotatable with respect to the main plate 102.

  The bearing portion of the barrel holder 160 that rotatably supports the upper shaft portion 120a of the barrel complete 120f, the bearing portion of the train wheel ring 162 that rotatably supports the upper shaft portion 124a of the center wheel & pinion 124, and the third wheel & pinion 126 The bearing portion of the train wheel bridge 162 that rotatably supports the upper shaft portion 126a, the bearing portion of the train wheel bridge 162 that rotatably supports the upper shaft portion 128a of the fourth wheel & pinion 128, and the escape wheel 130 Lubricating oil is injected into the bearing portion of the train wheel bridge 162 that rotatably supports the upper shaft portion 130a and the bearing portion of the ankle receiver 164 that rotatably supports the upper shaft portion 142a of the ankle 142. .

Further, the bearing portion of the main plate 102 that rotatably supports the lower shaft portion 120b of the barrel complete 120f, the bearing portion of the main plate 102 that rotatably supports the lower shaft portion 124b of the center wheel & pinion 124, and the third wheel 126 A bearing portion of the main plate 102 that rotatably supports the lower shaft portion 126b, a bearing portion of the main plate 102 that rotatably supports the lower shaft portion 128b of the fourth wheel & pinion 128, and a lower shaft portion 130b of the escape wheel 130. Lubricating oil is injected into the bearing portion of the ground plate 102 that is rotatably supported and the bearing portion of the ground plate 102 that rotatably supports the lower shaft portion 142 b of the ankle 142.
The lubricating oil described above is preferably a precision machine oil, and particularly preferably a so-called watch oil.

In order to enhance the lubricating oil retention performance, each bearing part of the main plate 102, each bearing part of the barrel holder 160, and each bearing part of the train wheel bridge 162 has a conical, cylindrical, or frustoconical oil sump. It is preferable to provide a part. Providing this oil reservoir can effectively prevent the oil from diffusing due to the surface tension of the lubricating oil.
Further, the main plate 102, the barrel holder 160, the train wheel bridge 162, and the ankle receiver 164 may be formed of metal such as brass, or may be formed of resin such as polycarbonate.

Next, the escape wheel & pinion 130 described above will be described in more detail. FIG. 5 is a plan view of the escape wheel and ankle, and FIG. 6 is an enlarged perspective view of the tooth portion of the escape wheel. In addition, illustration of the plating film mentioned later is abbreviate | omitted in FIG.
As shown in FIGS. 5 and 6, the escape wheel & pinion 130 includes the escape wheel portion 132 and the shaft member 131 driven into the center of the escape wheel portion 132.

  The escape gear portion 132 has a flat upper surface and a lower surface, is formed to have a uniform thickness over the entire surface, and has a plurality of tooth portions 132a formed in a special saddle shape. Yes. The claw stones 144a and 144b of the ankle 142, which will be described later, are in contact with the tips of the plurality of tooth portions 132a. That is, the side surface at the tip of the tooth portion 132a is a sliding surface (impact surface) 132b on which the claw stones 144a and 144b come into contact and slide.

Here, the escape gear portion 132 of the present embodiment includes a metal base material 136 formed to a predetermined thickness and a plating film 133 that coats the entire surface of the base material 136 by plating. Yes.
The base material 136 forms the outer shape of the escape gear portion 132, and is made of, for example, a metal material such as carbon steel, copper alloy, brass, white or stainless steel. Note that the base material 136 may be any material that can be plated, and a resin material may be employed in addition to the metal material described above.

  The plating film 133 is made of nickel (Ni), an alloy thereof, or the like, and is formed with a uniform thickness over the entire surface of the base material 136. In addition to the above-described materials, gold (Au), copper (Cu), palladium (Pd), rhodium (Rh), cobalt (Co), chromium (Cr), or the like can be used for the plating film 133. .

FIG. 7 is a cross-sectional view of the escape wheel (base material and plating film).
As shown in FIG. 7, the plating film 133 of this embodiment has a porous structure in which a large number of micropores 134 exist over the entire surface layer and inside. These micropores 134 are, for example, spherical voids, and each is formed in an equal size. The lubricating oil O is held in the micropores 134 of the plating film 133 due to surface tension or capillary action. Therefore, the entire side surface including the sliding surface 132b of the escape gear portion 132 of the base material 136 functions as an oil retaining surface capable of holding the lubricating oil O.

  The thickness T1 of the plating film 133 is set in the range of about 0.1 μm to 30 μm. This is because if the thickness T1 is too thin, the oil retaining function for retaining the lubricating oil O in the micro holes 134 cannot be satisfied, and if it is too thick, the dimensional accuracy of the escape gear portion 132 is lowered.

  The shaft member 131 is a member attached by being driven into a holding hole (not shown) provided at the center of the escape gear portion 132, and the central axis is the same as the central axis of the escape wheel 130. Yes. Moreover, the upper shaft part 130a mentioned above is provided in the upper end part of the shaft member 131, and the lower shaft part 130b is provided in the lower end part. Further, a hook portion 130c is provided below the upper shaft portion 130a. As described above, the hook portion 130c meshes with the gear portion 128d of the fourth wheel & pinion 128, whereby the rotational force of the fourth wheel & pinion 128 is transmitted to the shaft member 131 to thereby push the escape wheel 130. It plays the role of rotating.

  In the escape wheel & pinion 130 configured in this way, a plurality of teeth 132a mesh with the ankle 142. The ankle 142 includes an ankle body 142d formed in a T shape by three ankle beams 143 and an ankle true 142f, and the ankle true 142f that is an axis is configured to be rotatable. .

  Of the three ankle beams 143, claw stones 144 a and 144 b are provided at the tips of the two ankle beams 143, and an ankle lever 145 is attached to the tip of the remaining one ankle beam 143. The claw stones 144a and 144b are rubies formed in a quadrangular prism shape, and are bonded and fixed to the ankle beam 143 with an adhesive or the like.

  When the ankle 142 configured as described above is rotated around the ankle true 142f, the claw stone 144a or the claw stone 144b is moved to the tip of the tooth portion 132a of the escape wheel 130, more specifically, the sliding surface 132b. To come into contact. At this time, the ankle beam 143 to which the ankle lever 145 is attached is brought into contact with a dope pin (not shown), so that the ankle 142 does not further rotate in the same direction. As a result, the rotation of the escape wheel & pinion 130 is also temporarily stopped.

(Manufacturing method of escape wheel)
Next, the manufacturing method of the escape wheel mentioned above is demonstrated. FIG. 8 is a flowchart for explaining the escape wheel manufacturing method. 9 and 10 are process diagrams for explaining the manufacturing method of the escape wheel, and are sectional views corresponding to FIG.
First, as shown in FIG. 8, after preparing a flat plate adjusted to a predetermined thickness, a gear-shaped base material 136 is formed by performing a photolithography technique, press molding, cutting, or the like (S10: Base material formation). Process).

  Next, as shown in FIG. 9, the base material 136 is subjected to a plating process to deposit a plating film 133 on the entire surface of the base material 136 (S20: plating step). Specifically, in the plating step (S20) of this embodiment, so-called composite plating is performed in which fine particles 135 are dispersed in a plating solution and plating is performed while stirring, and the fine particles 135 are formed on the base material 136. The plating film 133 containing is deposited.

  As a plating method, for example, both electroplating and electroless plating can be employed. However, the electroless plating can obtain a uniform thickness and the fine particles 135 are easily dispersed uniformly in the plating film 133. Is preferably adopted. In the present embodiment, 30 vol. It is dispersed at a blending ratio of not more than%. The mixing ratio of the fine particles 135 is 30 vol. By setting it to% or less, the fine particles 135 can be efficiently taken in when the plating film 133 is deposited.

  Further, the fine particles 135 dispersed in the plating solution have a boiling point equal to or lower than that of the base material 136 and the plating film 133 and an average particle size (mass average particle size measured using a laser diffraction method) of 0. It is preferable to use a material having a thickness of about 0.01 μm to 5 μm. This is because if the microparticles 135 are too small, the micropores 134 after the microparticles 135 are removed in the removal step (S30) to be described later are too small to satisfy the oil retaining function for retaining the lubricating oil O. This is because if the fine particles 135 are too large, the fine particles 135 are difficult to be taken in when the plating film 133 is deposited.

  In the present embodiment, PTFE (polytetrafluoroethylene) is suitably used as a material that satisfies such conditions. In particular, PTFE has an advantage that the size of the micropores 134 to be formed later tends to be uniform since the particle diameter between the particles is relatively uniform. Note that the microparticles 135 can be made of various materials such as nanoparticles other than PTFE as long as the material satisfies the above-described conditions.

  In addition, Table 1 shown below is a table in which examples of materials of the base material 136, the plating film 133, and the fine particles 135 and their boiling points are summarized.

  Next, the base material 136 on which the plating film 133 is formed is heated to remove the fine particles 135 dispersed in the plating film 133 (S30: removal step). Specifically, plating is performed at a temperature not lower than the boiling point of the fine particles 135 and not higher than the boiling points of the base material 136 and the plating film 133 in a heating chamber maintained in an inert gas atmosphere such as argon or nitrogen or in a reduced pressure atmosphere. The coating 133 is heated. As a result, as shown in FIG. 10, only the microparticles 135 can be evaporated without melting the base material 136 and the plating film 133, and the evaporated microparticles 135 are released as gas from the plating film 133. Is done. Then, in the plated film 133, a micro hole 134 having the same particle diameter as the micro particle 135 (inner diameter is about 0.01 μm to 5 μm) is formed in a portion where the micro particle 135 has evaporated.

  In the removal step (S30), when the microparticles 135 evaporate, the microparticles 135 present on the surface layer of the plating film 133 are quickly released from the plating film 133. On the other hand, the microparticles 135 existing inside the plating film 133 are removed from the plating film 133 through the portion where the microparticles 135 communicate with each other, the microcracks generated in the plating film 133 due to the expansion of the microparticles 135, and the like. Released. Thereby, the micropore 134 can be formed over the whole inside of the plating film 133.

FIG. 11 is a photograph showing the plating film 133 after the removal step (S30). In the illustrated example, the plating film 133 is formed under the following conditions.
Base material type: High carbon steel Plating material type: Nickel-phosphorus Plating thickness: 5 μm
Plating treatment method: Electroless plating Fine particle type: PTFE (polytetrafluoroethylene)
Average particle size of fine particles: 0.1 μm

Subsequently, the lubricating oil O is filled into the micro holes 134 formed in the plating film 133 (S40: filling step). In the filling step (S40) of the present embodiment, a so-called sealing process is performed in which the minute holes 134 located at least in the surface layer portion of the plating film 133 are sealed with the lubricating oil O. Specifically, the base material 136 and the plating film 133 are held in a chamber under a reduced pressure atmosphere, and the gas remaining in the micro holes 134 is sucked. In this state, lubricating oil O is applied to the plating film 133, and then the inside of the chamber is returned to atmospheric pressure. As a result, the lubricating oil O applied to the plating film 133 enters the micro holes 134 and the lubricating oil O is retained. In addition, you may pressurize, after returning to atmospheric pressure. Further, the filling method of the lubricating oil O can be selected as appropriate, such as immersing the plating film 133 in the lubricating oil O at atmospheric pressure, or applying the lubricating oil O to the plating film 133.
The escape wheel 130 of this embodiment is completed by the above.

Thus, in this embodiment, the micropores 134 are formed in the plating film 133.
According to this configuration, since the plating film 133 has a porous structure, the lubricating oil O can be uniformly held in the minute holes 134 without unevenness. Further, since the lubricating oil O is held in the micro holes 134, the contact area between the lubricating oil O and the outside air can be suppressed, and volatilization of the lubricating oil O can be suppressed.
In addition, since the micro holes 134 are formed in the plating film 133, even when the plating film 133 is worn as shown in FIG. The lubricating oil O is held in the exposed minute hole 134.

Here, the manner in which the lubricating oil is held in the newly exposed micropores will be described with reference to FIGS.
13 and 14 are conceptual diagrams showing an example of a state in which the lubricating oil is held in the newly exposed micropores.
As shown in FIG. 13, lubricating oil Oa is held in the plurality of micro holes 134 a on the surface (external portion) of the base material 136.
Then, as shown in FIG. 14, when the minute hole 134 a is cut due to wear of the plating film 133, the minute hole 134 b inside the plating film 133 is exposed.
Then, the lubricating oil Oa held in the minute hole 134a flows into the newly exposed minute hole 134b (arrow in FIG. 14) and is retained in the minute hole 134b.
As described above, since the lubricating oil is sequentially held in the newly exposed micropores due to the wear of the plating film, the depletion of the lubricating oil can be suppressed and the lubricating performance can be reliably maintained over a long period of time. Therefore, the maintenance period can be extended.

  And in this embodiment, since the lubricating oil O can be uniformly hold | maintained to the sliding surface 132b of the escape wheel & pinion 130, the sliding surface 132b of the escape wheel & pinion 130 was excellent in oil retention performance. It can be used as an oil retaining surface. Thereby, the frictional resistance generated when the sliding surface (impact surface) 132b of the escape wheel 130 (the escape gear portion 132) slides on the claw stones 144a and 144b can be effectively reduced. . In addition, since the lubricating oil O can be evenly held on the sliding surface 132b, it is difficult for the frictional resistance to vary on the sliding surface 132b, and uneven wear can be suppressed. Therefore, it can be set as the reliable escape wheel 130 excellent in durability.

Moreover, in the present embodiment, in the plating step (S20), the base material 136 is immersed in a plating solution containing the fine particles 135 to form the plating film 133 containing the fine particles 135, and after the plating step (S20), It was set as the structure which has the removal process (S30) which removes the microparticles 135 in the plating film 133. FIG.
According to this configuration, it is possible to form a large number of micro holes 134 in the plating film 133 by removing the micro particles 135 in the plating film 133. Then, by filling the micro holes 134 with the lubricating oil O, the above-described effects can be obtained.
In particular, in this embodiment, since the base material 136 is coated by a plating process, a method of coating the base material 136 by an anodic oxidation process as in the past, or a case where the escape gear portion 132 itself is manufactured by electroforming, etc. Unlike the above, the degree of freedom in selecting materials and shapes can be improved. Thereby, the freedom degree of manufacture can be improved.

  In the present embodiment, in the removing step (S30), the base material 136 and the plating film 133 are heated by heating the plating film 133 at a temperature not lower than the boiling point of the plating film 133 and not higher than the boiling points of the base material 136 and the plating film 133. Therefore, it is possible to easily form the plating film 133 having the minute holes 134.

As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.
For example, in the above-described embodiment, the configuration in which the plating film 133 is formed on the entire base material 136 of the escape wheel & pinion 130 has been described. However, the configuration is not limited thereto, and the base material 136 is positioned at least on the sliding surface 132b. It does not matter as long as the plating film 133 is formed in the region.

  Moreover, although embodiment mentioned above demonstrated the case where the escape wheel & pinion 130 was employ | adopted as components for timepieces of this invention, it is not restricted to this. For example, you may apply this invention to each sliding surface of a date dial and the date jumper which controls the rotation direction of a date dial. The present invention can also be applied to various timepiece parts other than the escape wheel 130, date wheel, and date jumper. In particular, by applying the present invention to a component in which the lubricant O is essential and the lubricant O is liable to volatilize (a component whose sliding surface is exposed to the open space in the movement 100 and has a large contact area with the outside air), Lubricating performance can be exhibited over a long period of time.

In the above-described embodiment, the configuration in which the plating film 133 is heated to remove the microparticles 135 in the removing step (S30) has been described. However, the present invention is not limited thereto, and the microparticles 135 in the plating film 133 are removed with a solvent. It may be dissolved and removed.
In the embodiment described above, the mechanical timepiece has been described as an example. However, the present invention is not limited to this, and the present invention may be applied to an analog quartz timepiece.

  In addition, in the range which does not deviate from the meaning of this invention, it is possible to replace suitably the component in the embodiment mentioned above by the known component, and you may combine each modification mentioned above suitably.

DESCRIPTION OF SYMBOLS 130 ... escape wheel (watch parts) 133 ... plating film 134, 134a, 134b ... minute hole 135 ... minute particle 136 ... base material

Claims (4)

With the base material,
A plating film that coats the surface of the base material,
A timepiece part, wherein micropores are formed in the plating film. Having a plating process to form a plating film on the base material,
In the plating step, the base material is immersed in a plating solution in which fine particles are dispersed, and the plating film containing the fine particles is formed,
After the said plating process, it has the removal process which removes the said microparticle in the said plating film, The manufacturing method of the components for timepieces characterized by the above-mentioned. The fine particles are made of a material having a lower boiling point than the base material and the plating film,
In the removing step, the fine particles in the plating film are evaporated by heating the plating film at a temperature not lower than the boiling point of the plating film and not higher than the boiling points of the base material and the plating film. A method for manufacturing a timepiece part according to claim 2.   4. The method for manufacturing a timepiece part according to claim 2, wherein the fine particles are polytetrafluoroethylene.