JP2005147942A - Manufacturing method for machine part, machine part and clock equipped with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for machine parts, machine part and clock equipped with the machine parts capable of speed-up of manufacturing, ensuring long-term reliability by promoting improvement in anti-abrasion performance and smooth driving. <P>SOLUTION: A ground plate 11 as a machine part of a switching part 10 constituting a clock 1 has a guide groove 11A and a winding stem 12 is contained capable of reciprocal movement in the guide groove 11A. On the inner surface of the guide groove 11A, brittle material particulate is scattered in inert gas atmosphere and a sliding layer where and brittle material particulate is fixed is formed using inert gas as carrier gas. The brittle material particulate has a specific average particle diameter, and is a mixture of the first particle diameter particulate and the second particle diameter particulate having a larger average particle diameter than the first particle diameter particulate. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for manufacturing a machine part, a machine part, and a timepiece having the machine part.

Conventionally, several methods have been proposed and put into practical use for improving the wear resistance of a sliding contact surface in a mechanical part that is in sliding contact with another member.
For example, a method of improving the wear resistance of the sliding contact surface by improving the lubricity of the sliding contact surface is known (for example, see Patent Document 1).
In this method, the sliding surface of a machine part is coated with a chemical conversion coating such as a zinc phosphate coating, and the surface of the chemical conversion coating is coated with a coating containing solid lubricant particles, a binder, and a rust inhibitor. To do.
Further, for example, a method for improving the wear resistance of the sliding contact surface by increasing the hardness of the machine part itself and coating the sliding contact surface with a coating with high hardness is known (for example, Patent Documents). 2).
In this method, the base material of the machine part is formed of carbon steel that is tempered and tempered, and the sliding contact surface is coated with an electroless Ni-P plating film, followed by heat treatment in the coated state. .
Furthermore, for example, a method is known in which fine particles made of a brittle material are collided and fixed on the sliding contact surface of a mechanical component to improve the wear resistance of the sliding contact surface (see, for example, Patent Document 3).
In this method, an aerosol in which fine particles of brittle material of aluminum oxide (average particle size: 0.5 μm) are dispersed in a gas is collided with a base material of a machine part at high speed. Then, by this collision, fine fragment particles in which primary particles of brittle material fine particles are crushed are generated, and the fine contact particles are bonded to the base material or the fine fragment particles are joined to each other to form a dense material on the sliding surface of the base material. A sliding contact layer made of a brittle material is formed.

JP 2003-156575 A JP 2002-266078 A JP 2002-348677 A

However, the method described in Patent Document 1 aims to improve the lubricity of the sliding contact surface, and since the durability of the sliding contact surface itself of the machine component is not improved, the long-term reliability of the machine component is improved. It cannot be secured.
Moreover, in the method described in Patent Document 2, it is necessary to perform a complicated processing step by wet processing in which the sliding contact surface is coated with a coating of electroless Ni—P plating, and it is not possible to speed up the manufacture of mechanical parts. .
Furthermore, in the method described in Patent Document 3, the durability of mechanical parts is dramatically improved. However, since the average particle size of the brittle material fine particles is relatively small, the surface roughness of the sliding contact layer is reduced, and the sliding surface is reduced. The friction coefficient of the contact surface is increased. For this reason, for example, when the mechanical component is employed as a component of a precision device that is precise and is driven with a low driving force, it is difficult to smoothly drive the precision device.

  An object of the present invention is to provide a method of manufacturing a mechanical component, a mechanical component capable of speeding up manufacturing, promoting long-term reliability by promoting improvement in wear resistance, and enabling smooth driving, and the mechanical component. The object is to provide a watch with mechanical parts.

The method of manufacturing a mechanical component according to the present invention is a method of manufacturing a mechanical component in which fine particles made of a brittle material are collided and fixed to the sliding contact surface in order to manufacture a mechanical component having a sliding contact surface in sliding contact with another member. The brittle material fine particles are a mixture of the first particle size fine particles having a predetermined average particle size and the second particle size fine particles having an average particle size larger than the first particle size fine particles. And the fine particles of the brittle material are dispersed in an inert gas atmosphere, and the fine particles of the brittle material are collided and fixed to the sliding contact surface of the mechanical component using the inert gas as a carrier gas.
In the present invention, the brittle material fine particles are a mixture of the first particle size fine particles and the second particle size fine particles, and the second particle size fine particles have an average particle size larger than the average particle size of the first particle size fine particles. Have dimensions. In the case where such brittle material fine particles are dispersed in an inert gas atmosphere and the brittle material fine particles are collided and fixed to the sliding contact surface of the machine part using the inert gas as a carrier gas, the second particles among the brittle material fine particles are used. Some of the fine particles do not adhere to each other on the sliding contact surface and are likely to accumulate locally. Part of the second particle size fine particles deposited locally in this manner is easily peeled off from the sliding contact layer. For this reason, on the sliding contact surface, a plurality of immersed portions in which a part of the second particle size fine particles are peeled off are randomly arranged mainly in a dense fixing region where the first particle size fine particles are fixed. A layer will be formed. As a result, sufficient durability of the sliding contact surface in the machine part can be obtained by forming the fixing region, and contact between the sliding contact surface and another member that contacts the sliding contact surface by forming the recessed portion. It is possible to reduce the friction coefficient of machine parts by reducing the area. Therefore, it is possible to ensure the long-term reliability of the machine parts by promoting the improvement of the wear resistance of the machine parts, and if the machine parts of the present invention are employed as components of the precision equipment, the precision equipment can be driven smoothly. It becomes possible.
In addition, since the brittle material fine particles are collided and fixed on the sliding contact surface to form the sliding contact layer, the conventional sliding contact surface is coated with a coating film such as plating, and the like, without performing complicated processing steps such as wet processing. Parts can be manufactured quickly.

In the machine part manufacturing method of the present invention, the brittle material fine particles are preferably composed of a brittle material mainly composed of aluminum oxide and / or silicon carbide.
According to the present invention, the sliding contact layer can be strengthened by forming the brittle material fine particles from the brittle material mainly composed of aluminum oxide and / or silicon carbide. For example, the fixed region of the sliding contact layer formed mainly by collision and fixing of the first particle size fine particles can be strengthened, and sufficient durability of the sliding contact surface can be obtained.
In addition, by forming the brittle material fine particles from aluminum oxide and / or silicon carbide, the material can be easily obtained and the safety of the material is high. In addition, since the cost of the material is low, the manufacturing cost of mechanical parts can also be reduced.

In the method for manufacturing a machine part according to the present invention, it is preferable that the brittle material fine particles contain 50% by weight or more of the first particle fine particles and 50% by weight or less of the second particle fine particles.
By the way, when the brittle material fine particles are mixed so that the first particle size fine particles are contained less than 50% by weight and the second particle size fine particles are contained more than 50% by weight, the first particle size fine particles are mainly fixed by collision. As a result, in the fixed region of the slidable contact layer formed, a plurality of immersive portions due to part of the second particle size fine particles being peeled are arranged and formed more than necessary. For this reason, it is difficult to obtain sufficient durability of the sliding surface by the sliding layer.
According to the present invention, by mixing the first particle size fine particles and the second particle size fine particles with the above content, a plurality of immersive portions are randomly arranged and formed at an appropriate density in the fixing region of the sliding contact layer. Can do. Therefore, sufficient durability of the sliding contact surface can be obtained by the fixing region in the sliding contact layer, and the contact area with other members that are in contact with the sliding contact surface by a plurality of recessed portions arranged and formed at an appropriate density can be obtained. This can reduce the wear resistance of machine parts.

In the method for manufacturing a mechanical component of the present invention, the first particle size fine particles have an average particle size of 0.2 μm or more and less than 1.0 μm, and the second particle size fine particles are 1.0 μm or more and 5.0 μm. It is preferable to have the following average particle size.
By the way, when the first particle size fine particles have an average particle size of less than 0.2 μm, the friction coefficient on the surface of the fixed region of the sliding contact layer tends to increase. In addition, when the first particle size fine particles have an average particle size of 1.0 μm or more, a part of the first particle size fine particles are locally on the slidable contact surface in the same manner as a part of the second particle size fine particles. Therefore, it is difficult to obtain sufficient durability of the slidable contact surface by the slidable contact layer.
Further, when the second particle size fine particles have an average particle size of less than 1.0 μm, it becomes easy to collide and fix on the sliding contact surface as in the case of the first particle size fine particles, and a plurality of immersions are made in the sliding contact layer. The density at which the portions are arranged and formed is reduced, and it is difficult to reduce the contact area with other members that are in contact with the sliding contact surface. When the second particle size fine particles have an average particle size of more than 5.0 μm, the size of the plurality of immersed portions due to the separation of a part of the second particle size fine particles becomes large, and the sliding contact It is difficult to obtain sufficient durability of the sliding surface by the layer.
According to the present invention, the first particle size fine particles and the second particle size fine particles each have an average particle size within the above range, so that the above-mentioned problems can be avoided and the wear resistance of the machine parts is reduced. Can be improved.

The mechanical component of the present invention is manufactured by the above-described method for manufacturing a mechanical component.
According to the present invention, since the machine part is manufactured by the above-described method for manufacturing a machine part, the same operation and effect as the above-described method for manufacturing a machine part can be enjoyed.

The mechanical component of the present invention is a mechanical component having a sliding contact surface that is in sliding contact with another member, and on the sliding contact surface, a large number of fine particles made of a brittle material are collision-fixed to form a sliding contact layer, The sliding contact layer is characterized in that a plurality of immersion portions are formed by peeling off some of the large number of fine particles.
Here, the formation of a plurality of immersive portions by part of a plurality of fine particles being peeled means that, for example, the brittle material fine particles have different average particle size dimensions as in the above-described method of manufacturing a mechanical part. It is possible to adopt a method in which two first particle size fine particles and second particle size fine particles are mixed and a plurality of immersive portions are formed by peeling a part of the second particle size fine particles. Further, not limited to this method, for example, a method of forming a plurality of immersive portions by polishing the surface of the sliding contact layer after the brittle material fine particles are collided and fixed to the sliding contact surface to form a sliding contact layer is adopted. May be.
According to the present invention, the brittle material fine particle fixing region in the sliding contact layer and the plurality of immersed portions due to the separation of a part of the plurality of fine particles can enjoy the same operation and effect as the method of manufacturing a mechanical part. it can.

In the mechanical component according to the aspect of the invention, it is preferable that the immersion portion has a depth dimension of 0.1 μm or more and 5.0 μm or less.
By the way, when the depth dimension of the immersion part formed in the sliding contact layer is less than 0.1 μm, for example, when lubricating oil is applied to the surface of the sliding contact layer, the lubricating oil holding function by the sliding contact layer It is difficult to improve. Further, when the depth dimension of the immersive part exceeds 5.0 μm, the dimension of the immersive part becomes large, and it is difficult to obtain sufficient durability of the sliding contact surface by the sliding contact layer.
According to the present invention, since the immersion portion has a depth dimension within the above range, the above-described problems can be avoided. Moreover, since the immersion part has the depth dimension within the above range, for example, it is possible to improve the holding function of the lubricating oil corresponding to various lubricating oils having different viscosities.

In the mechanical component of the present invention, it is preferable that a lubricating oil is applied to the surface of the sliding contact layer.
According to the present invention, since the lubricating oil is applied to the surface of the sliding contact layer, the holding function of the lubricating oil in the sliding contact layer is improved by the plurality of recessed portions formed in the sliding contact layer. Therefore, with the configuration in which the lubricating oil is applied to the surface of the sliding contact layer in this way, the wear resistance of the machine part is further improved, and the long-term reliability of the machine part can be further secured by improving the holding function of the lubricating oil. .

A timepiece according to the present invention includes the mechanical parts described above.
According to the present invention, since the timepiece includes the above-described mechanical component, the same operation and effect as the above-described mechanical component can be enjoyed.
In addition, since the sliding contact layer formed on the sliding contact surface of the machine part has a function of retaining lubricating oil, when the lubricating oil is applied to the sliding contact layer, the smooth drive of the machine part is long-lasting. This makes it possible to provide a maintenance-free watch.

  As described above, according to the method for manufacturing a machine part, the machine part, and the timepiece having the machine part according to the present invention, the manufacture of the machine part can be speeded up and the wear resistance of the machine part can be improved. It can be promoted to ensure long-term reliability and can be driven smoothly.

[First embodiment]
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings.
FIG. 1 is a plan view schematically showing a main part of the switching unit 10 of the timepiece 1 in the first embodiment.
The switching unit 10 is a part that, for example, corrects the time of a clock, calendar correction such as day of the week, and the like by operating a winding stem 12 to which a crown 12A is attached at one end. As shown in FIG. 1, the switching unit 10 has a configuration in which a winding stem 12 is housed and disposed in a guide groove 11 </ b> A of the base plate 11 so as to be movable back and forth in the direction of arrow R with respect to the base plate 11. By pulling out 11, it is possible to correct the time of the clock, and correct the date, day of the week, etc.
As described above, when the winding stem 12 is moved back and forth with respect to the main plate 11 to correct the clock function, the outer peripheral surface of the winding stem 12 slides with respect to the inner peripheral surface of the guide groove 11A of the main plate 11. It becomes.
That is, the ground plane 11 corresponds to the mechanical component according to the present invention, and the inner peripheral surface of the guide groove 11A corresponds to the sliding contact surface according to the present invention.
In addition, as a material of the ground plane 11, a brass material can generally be employ | adopted. Further, as the material of the winding stem 12, for example, a material obtained by quenching and tempering carbon steel can be employed.
In such a switching unit 10, the guide groove 11 </ b> A of the base plate 11 is easily worn by the operation of the winding stem 12. For this reason, in this embodiment, as shown below, the manufacturing apparatus forms a sliding contact layer made of a brittle material on the inner peripheral surface of the guide groove 11A of the base plate 11.

Although the manufacturing apparatus for forming the sliding contact layer is not specifically illustrated, a film forming chamber whose inside is set to a predetermined pressure by a vacuum pump, an aerosol forming chamber for aerosolizing fine particles made of a brittle material, and Is provided.
In the film forming chamber, a holder for fixing the base plate 11 constituting the timepiece 1 and a mask having an opening at a position corresponding to the guide groove 11A of the base plate 11 are installed.
In the aerosol chamber, an inert gas is filled therein, and fine particles made of a brittle material are dispersed in an inert gas atmosphere, whereby the fine particles are aerosolized. The aerosol generation chamber is connected to the film formation chamber via a transfer pipe so that the aerosol generated in the chamber can be transferred into the film formation chamber. And the front-end | tip of the said conveyance pipe is arrange | positioned facing the guide groove 11A of the base plate 11 installed in the said holder through the said mask, and is formed in the nozzle shape which has opening of 5 mm x 1 mm, for example.

In the present embodiment, as the brittle material fine particles to be aerosolized in the aerosol chamber, the first fine particle having a predetermined average particle size and the average particle having a larger average particle size than the first fine particle. What mixed the 2nd particle size fine particle which has a diameter dimension is employ | adopted.
Here, the average particle size of the first particle size fine particles is in the range of 0.2 μm or more and less than 1.0 μm, and the average particle size of the second particle size fine particles is in the range of 1.0 μm or more and 5.0 μm or less. It is preferable that it exists in.
The first particle size fine particles are preferably contained in an amount of 50% by weight or more, the second particle size fine particles are preferably contained in an amount of 50% by weight or less, and the first particle size fine particles are contained in an amount of 90% by weight or more. It is more preferable that the two particle size fine particles are contained at 10% by weight or less.

Examples of the material of the first particle size fine particles and the second particle size fine particles include oxides such as aluminum oxide, zirconium oxide, zinc oxide, titanium oxide, chromium oxide, silicon oxide, and magnesium oxide, silicon carbide, and boron carbide. Carbides such as titanium carbide, zirconium carbide, niobium carbide, chromium carbide, tungsten carbide, nitrides such as boron nitride, silicon nitride, titanium nitride, niobium nitride, aluminum boride, silicon boride, titanium boride, boron Examples thereof include borides such as zirconium fluoride and chromium boride. Here, the first particle size fine particles and the second particle size fine particles may be composed of the same material or different materials.
Examples of the inert gas filled in the aerosol chamber include N ₂ , He, Ne, or Ar.

Next, a method for forming a sliding contact layer (hereinafter referred to as a jet molding method) by the manufacturing apparatus described above will be described.
First, the base plate 11 of the timepiece 1 that is a target part for forming the sliding contact layer is placed on the holder. Further, an inert gas is filled in the aerosol generating chamber, and an aerosol in which the first particle size fine particles, the second particle size fine particles and the inert gas are mixed at an appropriate ratio is generated. Further, the film formation chamber is evacuated to a predetermined pressure by the vacuum pump, and a differential pressure is generated in the film formation chamber and the aerosolization chamber.
As the differential pressure is generated in this manner, the aerosol generated in the aerosolization chamber is accelerated through the carrier tube, and the aerosol is sprayed from the nozzle at a speed around the speed of sound. The sprayed aerosol is collided and fixed only to the guide groove 11A of the main plate 11 through the mask, and a sliding contact layer is formed on the inner peripheral surface of the guide groove 11A.
In addition, the thickness dimension of this sliding contact layer should just be 0.1 micrometer or more, but it is preferable to exist in the range of 1 micrometer or more and 10 micrometers or less.

FIG. 2 is a schematic diagram showing the surface state of the formed sliding contact layer 11B. Specifically, FIG. 2A is a diagram showing a cross-sectional structure of the sliding contact layer 11B, and FIG. 2B is a view of a part of the sliding contact layer 11B as viewed from above.
As shown in FIG. 2, the surface of the sliding contact layer 11 </ b> B formed by the above-described jet molding method has a plurality of recessed portions 11 </ b> C randomly formed in a region having a predetermined average surface roughness. In the present embodiment, the plurality of recessed portions 11C formed on the surface of the sliding contact layer 11B have a depth dimension within a range of 0.1 μm or more and 5.0 μm or less. The plurality of immersive portions 11C are formed on the surface of the sliding contact layer 11B in this way because the average particle size of the second particle size particles is larger than that of the first particle size particles. The portions do not adhere to each other on the guide groove 11A and are locally deposited on the guide groove 11A. Then, the first particle size fine particles and the second particle size fine particles sprayed from the nozzle are peeled when colliding with a part of the second particle size fine particles that are locally deposited, and the peeled portion is the immersion portion 11C. It has become. Further, the region other than the immersion portion 11C is a dense fixing region in which the first particle size fine particles are mainly fixed to each other on the guide groove 11A.

  As described above, after the sliding contact layer 11B is formed on the inner peripheral surface of the guide groove 11A of the base plate 11, an appropriate amount of the watch exclusive lubricant “Sinta V Roube (trade name)” is applied to the surface of the sliding contact layer 11B ( In FIG. 2A, this is indicated by a two-dot chain line). Then, the winding stem 12 is accommodated in the guide groove 11A of the base plate 11 in this state.

[Effects of First Embodiment]
The first embodiment described above has the following effects.
(1) Sufficient durability of the inner peripheral surface of the guide groove 11A of the ground plane 11 can be obtained by the fixing region in the sliding contact layer 11B, and the inner periphery of the guide groove 11A by the plurality of recessed portions 11C in the sliding contact layer 11B. By reducing the contact area between the surface and the winding stem 12, the friction coefficient of the guide groove 11A can be reduced. Therefore, the wear resistance of the guide groove 11A in the base plate 11 is improved, and the wear powder is less likely to be generated in the guide groove 11A, so that the wear powder is not transferred to other parts such as a train wheel, and the watch 1 Long-term reliability can be secured. Moreover, the switching operation of the winding stem 12 by the operation of the crown 12A can be smoothly performed, and a good operational feeling of the winding stem 12 can be given to the user.

(2) Since the slidable contact layer 11B is formed by the jet molding method, the ground plane 11 can be quickly formed without carrying out complicated processing steps such as a wet process of covering the slidable contact surface with a coating such as plating as in the prior art. Can be manufactured.
(3) Since the sliding contact layer 11B is formed with a plurality of recessed portions 11C, the holding function of the watch-dedicated lubricant “Sinter V Roube (trade name)” in the sliding contact layer 11B is improved. Therefore, by applying the watch exclusive lubricant “Sinta V Roube (trade name)” to the surface of the sliding contact layer 11B, the wear resistance of the guide groove 11A in the base plate 11 is further improved and the operation of the crown 12A is performed. Therefore, a smoother switching operation of the winding stem 12 can be performed in the long term, and the maintenance-free timepiece 1 can be obtained. Therefore, parts replacement and maintenance are not performed due to the malfunction of the switching unit 10, and an extra burden is not imposed on the user, the watch shop, or the manufacturer.

(4) If the first particle size fine particles and the second particle size fine particles constituting the brittle material fine particles are made of a brittle material mainly composed of aluminum oxide and / or silicon carbide, the fixing region in the sliding contact layer 11B Can be made strong, and sufficient durability of the inner peripheral surface of the guide groove 11A in the base plate 11 can be obtained.
(5) Further, when aluminum oxide and / or silicon carbide is adopted as the material of the first particle size fine particles and the second particle size fine particles, the material can be easily obtained and the safety of the material is high. In addition, since the cost of the material is low, the manufacturing cost of the ground plane 11 can also be reduced.

(6) If the brittle material fine particles contain 50% by weight or more of the first particle size fine particles and 50% by weight or less of the second particle size fine particles, a plurality of immersions are in the fixed region of the sliding contact layer 11B. The portions 11C can be randomly arranged and formed at an appropriate density. Therefore, sufficient durability of the inner peripheral surface of the guide groove 11A in the ground plane 11 can be obtained by the fixing region in the sliding contact layer 11B, and the guide grooves 11A can be formed by the plurality of recessed portions 11C arranged and formed at an appropriate density. The contact area between the inner peripheral surface and the winding stem 12 can be reduced, and the wear resistance of the guide groove 11A can be improved.

(7) The average particle size of the first particle size fine particles is in the range of 0.2 μm or more and less than 1.0 μm, and the average particle size of the second particle size fine particles is in the range of 1.0 μm or more and 5.0 μm or less. With this configuration, the friction coefficient on the surface of the fixed area of the sliding contact layer 11B is not increased, and the formation density of the immersive portion 11C with respect to the fixed area and the dimension of the immersive portion 11C can be appropriately set, and the sliding contact can be achieved. The wear resistance of the guide groove 11A of the ground plane 11 by the layer 11B can be improved.
(8) Since the plurality of immersive portions 11C have a depth dimension in the range of 0.1 μm or more and 5.0 μm or less, the immersive portions 11C are appropriately dimensioned and the guide grooves 11A are formed by the sliding contact layer 11B. Sufficient durability of the inner peripheral surface can be obtained, and the holding function of the watch exclusive lubricant “Sinta V Roube (trade name)” can be reliably improved. Also, not only watch exclusive lubricant “Sinta V Robe (trade name)” but also various watch exclusive lubricants with different properties such as viscosity and temperature characteristics, the retention function of watch exclusive lubricant is improved reliably. it can.

[Second Embodiment]
Next, 2nd Embodiment of this invention is described based on drawing.
In the following description, the same structure and the same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
In the first embodiment, the slidable contact layer 11 </ b> B made of a brittle material is formed on the inner peripheral surface of the guide groove 11 </ b> A of the base plate 11 constituting the switching portion 10 of the timepiece 1.
In contrast, in the second embodiment, a sliding contact layer made of a brittle material is formed on a part of the date jumper 21 constituting the date correction unit 20 of the timepiece 2.

FIG. 3 is a plan view schematically showing a main part of the date correcting unit 20 of the timepiece 2 in the second embodiment.
The date correction unit 20 is a part that corrects the displayed date by rotating the date wheel 22 by the operation of the crown not shown by the user or the driving of the clock 2 itself. As shown in FIG. 3, the date correction unit 20 includes a date jumper 21 and a date wheel 22.
The date jumper 21 regulates the rotation operation of the date indicator 22 and is composed of a member having a spring property. As shown in FIG. 3, one end 21A is fixed at a predetermined position of the main plate, and the other end 21B is the date. Engage between the protrusions 22 </ b> A formed on the inner peripheral portion of the wheel 22. An inclined surface 21 </ b> C is formed at the other end 21 </ b> B of the date jumper 21 so that the angle formed between the projections 22 </ b> A of the date dial 22 is an obtuse angle.
When the date indicator 22 rotates, the protrusion 22A slides on the inclined surface 21C of the other end 21B while pressing the inclined surface 21C of the other end 21B in the direction opposite to the urging direction of the date jumper 21. And if the date indicator 22 further rotates, there will be nothing that presses the inclined surface 21C, so that the date jumper 21 returns to its original state, and the inclined surface 21C of the other end 21B is in the groove between the projections 22A of the date indicator 22 Engage.
That is, the date jumper 21 corresponds to the mechanical component according to the present invention, and the inclined surface 21C corresponds to the sliding contact surface according to the present invention.
In addition, as a material of the date jumper 21, what is necessary is just a member which has a spring property, For example, copper alloys, such as phosphor bronze and brass, are employable. Moreover, as a material of the date indicator 22, for example, aluminum whose surface is anodized can be used.

In such a date corrector 20, since any one of the protrusions 22A of the date indicator 22 is always in contact with the inclined surface 21C of the date jumper 21, it is approximately 30 to each protrusion 22A of the date indicator 22. A load of about twice will be applied. For this reason, the inclined surface 21C of the date jumper 21 is easily worn. In the present embodiment, a sliding contact layer 21D made of a brittle material is formed on the inclined surface 21C of the date jumper 21. In addition, since the sliding contact layer 21D can be formed by the jet molding method described in the first embodiment, description of the formation method is omitted. Further, an immersion portion 11C is formed on the surface of the formed sliding contact layer 21D in the same manner as the surface of the sliding contact layer 11B described in the first embodiment.
Then, after the sliding contact layer 21D is formed on the inclined surface 21C of the date jumper 21, as in the first embodiment, an appropriate amount of the watch exclusive lubricant “Sinta V Roube (trade name)” is applied to the surface of the sliding contact layer 21D. Apply. In this state, the date jumper 21 is installed in the date correction unit 20.

[Effects of Second Embodiment]
According to 2nd Embodiment mentioned above, there exist the following effects other than the effect substantially the same as said (1)-(8).
(9) By forming the sliding contact layer 21D on the inclined surface 21C of the date jumper 21, the wear resistance of the inclined surface 21C can be improved, and the torque at the time of date correction is reduced, and the user can operate the crown well. A feeling can be given and no load is applied when the timepiece 2 itself is driven. Further, since the sliding contact layer 21D has a lubricating oil retaining function, by applying the watch dedicated lubricating oil “Sinta V Robe (trade name)” to the surface of the sliding contact layer 11B, the inclined surface 21C The wear resistance is further improved, and the date wheel 22 can be driven more smoothly in the long term. Due to the long-term use of the watch 2, the torque at the time of date correction does not exceed the torque held by the magnetic motor in a quartz watch, for example, and also does not exceed the torque held by the mainspring in a mechanical watch, for example. There is no danger of stopping driving.

[Third embodiment]
Next, 3rd Embodiment of this invention is described based on drawing.
In the following description, the same structure and the same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
In the first embodiment, the slidable contact layer 11 </ b> B made of a brittle material is formed on the inner peripheral surface of the guide groove 11 </ b> A of the base plate 11 constituting the switching portion 10 of the timepiece 1.
On the other hand, in the third embodiment, a sliding contact layer made of a brittle material is formed on a part of the square hole second intermediate wheel 34 constituting the winding part 30 of the timepiece 3.

FIG. 4 is a plan view schematically showing a main part of the winding part 30 of the timepiece 3 in the third embodiment.
The winding unit 30 is a part that winds up the mainspring that accumulates mechanical energy for moving the pointer by manually turning the crown 12A. As shown in FIG. 4, the winding unit 30 rotates the winding stem 12 by turning the crown 12 </ b> A by hand. The winding stem 31, the round hole wheel 32, the square hole first intermediate wheel 33, and the square hole second It is transmitted to the square hole wheel 35 via the intermediate wheel 34. Then, by rotating the square hole wheel 35, the mainspring (not shown) is wound up.

FIG. 5 is a cross-sectional view showing the structure of the square hole second intermediate wheel 34.
As shown in FIG. 5, a hole 11D is formed in the base plate 11 at the installation position of the square hole second intermediate wheel 34, and a fixing pin 11E for mounting the square hole second intermediate wheel 34 is fitted into the hole 11D. To do.
The fixing pin 11E is composed of a substantially cylindrical body, and a set screw 11F for attaching the square hole second intermediate wheel 34 is screwed onto a cylindrical inner side surface in which a screw groove (not shown) is formed.
As shown in FIG. 5, the square hole second intermediate wheel 34 is formed with a round hole 34 </ b> A through which the fixing pin 11 </ b> E can be inserted at a substantially central portion of the plane. Then, by inserting the fixing pin 11E fitted in the hole 11D of the base plate 11 through the round hole 34A, the square hole second intermediate wheel 34 is restricted from moving in the in-plane direction of the base plate 11, and the fixing pin The square hole second intermediate wheel 34 is rotatable about the axis 11E.
Further, as shown in FIG. 5, the square hole second intermediate wheel 34 is formed with a recess 34B corresponding to the shape of the rotation end of the set screw 11F. Then, by screwing the set screw 11F to the fixing pin 11E, the rotation end of the set screw 11F is arranged in a loosely fitted state in the recess 34B of the square hole second intermediate wheel 34, and is orthogonal to the in-plane direction of the main plate 11. The movement of the square hole second intermediate wheel 34 in the direction is restricted.

In the state as described above, when the square hole second intermediate wheel 34 is rotated by turning the crown 12A (FIG. 4) by hand, the square hole second intermediate wheel with respect to the back surface of the head of the set screw 11F. The bottom surface 34C of the recess 34B of 34 will slide.
That is, the square hole second intermediate wheel 34 corresponds to the mechanical component according to the present invention, and the bottom surface 34C of the recess 34B corresponds to the sliding contact surface according to the present invention.
In addition, as a material of the square hole second intermediate wheel 34 and the set screw 11F, for example, carbon steel (PBS100CB) can be adopted.
In such a winding part 30, the bottom face 34C of the recessed part 34B of the square hole second intermediate wheel 34 is easily worn by the winding operation of the mainspring. Further, due to the winding operation of the mainspring, the surface temperature of the square hole second intermediate wheel 34 tends to be high. For example, when the square hole second intermediate wheel 34 is made of metal, the surface is oxidized and rust is generated due to the high temperature. End up. For this reason, in this embodiment, the sliding contact layer 34D made of a brittle material is formed on the bottom surface 34C of the recess 34B of the square hole second intermediate wheel 34. In addition, since the sliding contact layer 34D can be formed by the jet molding method described in the first embodiment, description of the forming method is omitted. Further, an immersion portion 11C is formed on the surface of the formed sliding contact layer 34D in the same manner as the surface of the sliding contact layer 11B described in the first embodiment.
Then, after the sliding contact layer 34D is formed on the bottom surface 34C of the concave portion 34B of the square hole second intermediate wheel 34, as in the first embodiment, on the surface of the sliding contact layer 34D, a dedicated watch lubricant “sinter V louver ( Appropriate amount of “product name)” is applied. In this state, the square hole second intermediate wheel 34 is installed on the winding part 30.

[Effect of the third embodiment]
According to 3rd Embodiment mentioned above, there exist the following effects other than the effect substantially the same as said (1)-(8).
(10) By forming the sliding contact layer 34D on the bottom surface 34C of the recess 34B of the square hole second intermediate wheel 34, the wear resistance of the bottom surface 34C can be improved and the winding operation of the mainspring by the operation of the crown 12A is smooth. And can give the user a good feeling of operation of the crown 12A. Further, since the sliding contact layer 34D has a lubricating oil retaining function, the lubricant for watch exclusive use “Sinta V Robe (trade name)” is applied to the surface of the sliding contact layer 34D, whereby the resistance of the bottom surface 34C is improved. The wearability is further improved, a smooth winding operation by the crown 12A can be performed for a long period of time, and a continuous cooling function can be maintained even when the square hole second intermediate wheel 34 slides. . As a result, the bottom surface 34C is not worn and rust due to oxidation does not occur on the surface.

[Modification of Embodiment]
Although the present invention has been described with reference to preferred embodiments, the present invention is not limited to these embodiments, and various improvements and design changes can be made without departing from the scope of the present invention. It is.
In each of the above embodiments, the plurality of immersive portions 11C of the sliding contact layers 11B, 21D, and 34D are configured by mixing brittle material fine particles with two first particle size fine particles and second particle size fine particles having different average particle size dimensions. However, the present invention is not limited to this. For example, the brittle material fine particles may collide and adhere to the sliding contact surface to form a sliding contact layer, and then the surface of the sliding contact layer may be polished to form a plurality of recessed portions. That is, the shape of the immersion portion is not limited to the substantially hemispherical shape described in the above embodiments, but may be a groove shape extending in the polishing direction.

In each of the above-described embodiments, when forming the sliding contact layers 11B, 21D, and 34D, the velocity of the aerosol sprayed from the nozzle is set to around the sonic velocity. However, the pressure is not limited to this, and the differential pressure generated in the film formation chamber and the aerosolization chamber. The aerosol may be sprayed from the nozzle at a speed other than the speed around the sound speed by changing.
In each of the above embodiments, the base material 11 on which the sliding contact layers 11B, 21D, and 34D are formed, the date jumper 21, and the square hole second intermediate wheel 34 are not limited to the materials described in the above embodiments. Other members such as other metals, ceramics, metalloids, or organic compounds can also be employed. As described above, since various materials can be used as the base material, the degree of freedom in designing the mechanical parts can be improved.
In each of the above-described embodiments, the configuration in which the mechanical parts of the present invention are the base plate 11, the date jumper 21, and the square hole second intermediate wheel 34, which are constituent parts of the timepieces 1, 2, and 3, has been described. Any component may be used as long as it has a sliding contact surface. Moreover, although the structure which employ | adopted mechanical parts for the timepieces 1, 2, and 3 was demonstrated, you may employ | adopt the mechanical parts of this invention for precision instruments other than a timepiece.

Next, the effect of this invention is demonstrated based on a specific Example.
[Example 1]
In Example 1, a film thickness of 5 μm is formed on the inner peripheral surface of the guide groove 11A of the base plate 11 made of a brass-based material constituting the switching unit 10 by the jet molding method based on the first embodiment under the following film formation conditions. The sliding contact layer was formed. In addition, an appropriate amount of watch exclusive lubricant “Sinta V Roube (trade name)” was applied to the surface of the formed sliding contact layer.

(Deposition conditions)
Deposition chamber pressure: 70 Pa
Aerosolization chamber pressure: 70kPa
Carrier gas type: He
Deposition temperature: normal temperature
Nozzle-work distance: 4mm
Material of brittle material fine particles: Aluminum oxide Average particle size of first particle size fine particles: 0.3 μm
Average particle size of the second particle size fine particles: 2 to 3 μm
Content of second particle size fine particles: 10% by weight (based on 100% by weight of brittle material fine particles)

[Example 2]
In Example 2, a sliding contact layer having a film thickness of 5 μm was formed on the inclined surface 21 </ b> C of the date jumper 21 constituting the date correcting unit 20 using the same jet molding method and film forming conditions as in Example 1 above. In addition, an appropriate amount of watch exclusive lubricant “Sinta V Roube (trade name)” was applied to the surface of the formed sliding contact layer. In addition, as a material of the date jumper 21, MX-96 (trade name) was used.

[Example 3]
In the third embodiment, a sliding contact layer having a film thickness of 5 μm is formed on the bottom surface 34C of the concave portion 34B of the square hole second intermediate wheel 34 constituting the winding portion 30 under the same jet molding method and film forming conditions as in the first embodiment. Formed. In addition, an appropriate amount of watch exclusive lubricant “Sinta V Roube (trade name)” was applied to the surface of the formed sliding contact layer. Carbon steel (PBS100CB) was used as the material of the square hole second intermediate wheel 34.

  In Example 1 to Example 3, as a result of forming the slidable contact layer under the above film forming conditions, the depth dimension of the immersive part formed in the slidable contact layer was about 2 μm on average.

[Comparative Example 1]
In this comparative example 1, the surface of the ground plate 11 made of the same brass material as in the first example was coated with Ni electrolytic plating. The surface hardness (Vickers hardness) in this state is 300 to 400. In addition, an appropriate amount of a watch exclusive lubricant “Sinta V Roube (trade name)” similar to that of Example 1 was applied to the Ni-plated surface.

[Comparative Example 2]
In Comparative Example 2, the surface of the date jumper 21 made of MX-96 (trade name) similar to that of Example 2 was coated with Ni electrolytic plating. The surface hardness (Vickers hardness) in this state is 300 to 400. Also, an appropriate amount of the watch exclusive lubricant “Sinta V Roube (trade name)” similar to that of Example 2 was applied to the Ni-plated surface.

[Comparative Example 3]
In Comparative Example 3, the surface of the square hole second intermediate wheel 34 made of carbon steel (PBS100CB) similar to that of Example 3 was coated with Ni-P plating, and further heat-treated. . The surface hardness (Vickers hardness) in this state is 500 to 700. In addition, an appropriate amount of the watch exclusive lubricant “Sinta V Roube (trade name)” similar to that of Example 3 was applied to the Ni-P plated surface.

The mechanical parts of Examples 1 to 3 and Comparative Examples 1 to 3 were evaluated by the following evaluation methods.
(Evaluation 1)
The base plate 11 of Example 1 and Comparative Example 1 is installed in the timepiece 1, and a switching durability test of the switching unit 10 in each timepiece 1 is performed. Specifically, in the switching durability test, the crown 12A is manually operated to continuously perform the switching operation of pulling out and pushing in the winding stem 12, and confirm the wear state of the guide groove 11A in the base plate 11. At this time, as the material of the winding stem 12, carbon steel subjected to quenching and tempering is adopted.
As a result, in Comparative Example 1, wear is confirmed on the inner peripheral surface of the guide groove 11A from about 50 continuous switching operations (corresponding to approximately one year), and the amount of wear tends to increase after 50 continuous switching operations. It was in. Further, after the endurance test corresponding to one year when the wear was confirmed, the sense of smooth switching operation of the winding stem 12 by the crown 12A tended to be impaired.
On the other hand, in Example 1, no wear was confirmed on the inner peripheral surface of the guide groove 11A even after about 50 continuous switching operations (equivalent to about 1 year) and over 500 continuous switching operations (equivalent to about 10 years). . Further, when the durability test was carried out for 10 years, the operation of switching the winding stem 12 by the crown 12A could be carried out smoothly, and the operation feeling was maintained.

(Evaluation 2)
The date jumper 21 of Example 2 and Comparative Example 2 is installed in the timepiece 2, and the date correction acceleration test of the date correction unit 20 in each timepiece 2 is performed. Specifically, in the date correction acceleration test, the crown 12 </ b> A is manually turned to rotate the date wheel 22, and the wear state of the inclined surface 21 </ b> C in the date jumper 21 is confirmed. At this time, as the material of the date indicator 22, aluminum whose surface is anodized is adopted.
As a result, in Comparative Example 2, no wear was confirmed on the inclined surface 21C of the date jumper 21 even in about 100 laps of the date-corrected continuous operation (generally equivalent to the general warranty time). After a considerable amount, the inclined surface 21C was worn, and the amount of wear tended to increase in accordance with the durability of the accelerated test. Further, the sense of rotational operation of the crown 12A tended to be impaired in accordance with the durability years of the acceleration test.
On the other hand, in Example 2, no wear was confirmed on the inclined surface 21 </ b> C even in the day correction continuous operation of 200 laps or more (approximately equivalent to 17 years). In addition, during the acceleration test equivalent to 17 years, the rotation operation of the crown 12A was smoothly performed, and the operation feeling was maintained.

(Evaluation 3)
The square hole second intermediate wheel 34 of Example 3 and Comparative Example 3 is installed in the timepiece 3, and a winding acceleration test of the winding portion 30 in each timepiece 3 is performed. Specifically, in the winding acceleration test, the crown 12A is manually turned to rotate the square hole second intermediate wheel 34, and the wear state of the bottom surface 34C of the square hole second intermediate wheel 34 is confirmed. At this time, the set screw 11F employs the same carbon steel (PBS100CB) as the square hole second intermediate wheel 34 of Comparative Example 3, and the surface is coated with Ni-P plating, and further subjected to heat treatment. did.
As a result, in Comparative Example 3, wear is confirmed on the bottom surface 34C of the square hole second intermediate wheel 34 from about 365 continuous winding operations, and the amount of wear tends to increase according to the durability years of the acceleration test. Rust was generated on the surface of the bottom surface 34C. Further, the sense of rotational operation of the crown 12A tended to be impaired in accordance with the durability years of the acceleration test.
On the other hand, in Example 3, wear was not confirmed on the bottom surface 34C of the square hole second intermediate wheel 34 even after the continuous winding operation 3650 times or more (equivalent to about 10 years), and no rust was generated on the surface of the bottom surface 34C. . In addition, when the acceleration test was carried out for 10 years, the crown 12A could be smoothly rotated and the operation feeling was maintained.

  As described above, in Example 1, Example 2, or Example 3, it is possible to dramatically extend the durability guarantee years compared to Comparative Example 1, Comparative Example 2, or Comparative Example 3, and long-term. Maintenance-free can be realized. Differentiation can be achieved even in an expensive watch that is regarded as a luxury product.

The top view which shows typically the principal part of the switching part of the timepiece in 1st Embodiment. The schematic diagram which shows the surface state of the formed sliding contact layer in the said embodiment. The top view which shows typically the principal part of the date correction part of the timepiece in 2nd Embodiment. The top view which shows typically the principal part of the winding part of the timepiece in 3rd Embodiment. Sectional drawing which shows the structure of the square hole 2nd intermediate wheel in the said embodiment.

Explanation of symbols

  1, 2, 3 ... Clock, 11 ... Ground plate (machine parts), 11B, 21D, 34D ... Sliding contact layer, 11C ... Immersion part, 21 ... Date jumper (machine parts), 21C ... inclined surface (sliding contact surface), 34 ... square hole second intermediate wheel (machine part), 34C ... bottom surface (sliding contact surface).

Claims (9)

In order to manufacture a mechanical component having a sliding contact surface that is in sliding contact with another member, a mechanical component manufacturing method in which fine particles made of a brittle material are collided and fixed to the sliding contact surface,
The brittle material fine particles are a mixture of a first particle size fine particle having a predetermined average particle size and a second particle size fine particle having an average particle size larger than the first particle size,
A method of manufacturing a mechanical component, comprising dispersing the brittle material fine particles in an inert gas atmosphere, and using the inert gas as a carrier gas to collide and fix the brittle material fine particles to a sliding surface of the mechanical component. In the manufacturing method of the machine component of Claim 1,
The brittle material fine particles are composed of a brittle material mainly composed of aluminum oxide and / or silicon carbide. In the manufacturing method of the machine component of Claim 1 or Claim 2,
The brittle material fine particles contain 50% by weight or more of the first particle size fine particles, and contain 50% by weight or less of the second particle size fine particles. In the manufacturing method of the machine component in any one of Claims 1 thru | or 3,
The first particle size fine particles have an average particle size of 0.2 μm or more and less than 1.0 μm,
The second particle size fine particles have an average particle size of 1.0 μm or more and 5.0 μm or less.   A machine part manufactured by the method for manufacturing a machine part according to claim 1. A mechanical component having a sliding contact surface in sliding contact with another member,
On the sliding contact surface, a large number of fine particles made of a brittle material are impacted and fixed to form a sliding contact layer,
The mechanical component, wherein the sliding contact layer is formed with a plurality of recessed portions by peeling off some of the large number of fine particles. The machine part according to claim 6,
The immersion part has a depth dimension of not less than 0.1 μm and not more than 5.0 μm. The machine part according to claim 6 or 7,
A machine part, wherein a lubricating oil is applied to a surface of the sliding contact layer.   A timepiece comprising the mechanical component according to any one of claims 5 to 8.

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