Timepiece component, timepiece, and method of manufacturing a timepiece component

Abstract

The present application provides a kind of clock component, clock and the manufacturing method of clock component, can high quality and high efficiency manufacture the clock component with the symbolic element of the blade mark of the blade body of Japanese sword. The manufacturing method of clock component includes: preparation process, prepares the base material with martensite region and austenite region formed on the jade steel;Cutting process, the thickness of the base material is thinned by cutting processing from the opposite side of the base material;And cutting process, the base material after thinning is cut into the shape of clock component by laser processing.

Description

Technical Field

[0001] This invention relates to watch components, watches, and methods for manufacturing watch components. Background Technology

[0002] Besides their practical function of telling time, clocks also serve as a cherished collectible. For example, Patent Document 1 discloses a table clock that uses the handguard of a Japanese sword as its dial, allowing users to appreciate the handguard while simultaneously displaying the time.

[0003] Patent Document 1: Japanese Utility Model Registration No. 3219219

[0004] However, the clock in Patent Document 1 uses the handguard of a Japanese sword as the dial of a clock, making it difficult to use in wristwatches, pocket watches, etc. Therefore, a clock component incorporating elements of a Japanese sword blade is sought that can be used in wristwatches, etc. Summary of the Invention

[0005] One aspect of the present application discloses a method for manufacturing a watch component, comprising the following steps: a preparation step, preparing a substrate having martensitic and austenitic regions formed on a steel substrate; a cutting step, thinning the substrate from the reverse side by cutting; and a removal step, removing the thinned substrate by laser processing into the shape of a watch component.

[0006] One aspect of this application is a watch component made of tamahagane steel, the watch component having a martensitic region and an austenitic region with a lower hardness than the martensitic region.

[0007] One aspect of this application provides a watch comprising a dial, a first strap, and a second strap engaging with the first strap, both the first and second straps having martensitic and austenitic regions, the boundary lines being arranged such that they are connected in the first and second straps. Attached Figure Description

[0008] Figure 1 This is the front view of the clock according to Embodiment 1.

[0009] Figure 2 This is a top view of the substrate.

[0010] Figure 3 This is a flowchart illustrating the process of preparing the substrate.

[0011] Figure 4 yes Figure 2 A cross-sectional view of section bb.

[0012] Figure 5It is a flowchart showing the manufacturing process of the watch dial.

[0013] Figure 6 This is a schematic diagram of the laser processing device.

[0014] Figure 7 It is a diagram showing the shape of the watch dial during the manufacturing process.

[0015] Figure 8 It is a diagram of the manufacturing process of the watch dial.

[0016] Figure 9 yes Figure 8 A cross-sectional view of the cc section.

[0017] Figure 10 This is the front view of the clock according to embodiment 2.

[0018] Figure 11 This is the front view of the clock according to embodiment 3.

[0019] Figure 12 This is the rear view of the clock.

[0020] Label Explanation

[0021] 1: Hour hand; 2: Minute hand; 3: Second hand; 5: Main stem; 8: Through hole; 9: Crown; 11: First strap; 12: Second strap; 13: Hour markers; 14: Date window; 17: Block; 21: Martensitic region; 22: Austenitic region; 23: Pattern; 24: Pattern; 25: Pattern; 26: Pattern; 30: Dial; 30a: Front; 30b: Back; 34: Mounting hole; 35: Locating pin; 36: Protective film; 38: Dial; 40: Substrate; 40a: Front; 40b: Reverse side; 42: Temperature adjustment component; 43: Reference hole; 45: Protective film; 47: Mark; 48: Mark; 49: Energy storage display; 51: First strap; 52: Second strap; 75: Main body; 76: Hammer; 77: Fixing pin; 80: Rotating hammer; 81: Laser oscillator; 82: Transmission optical system; 83: Irradiation unit; 85: Processing table; 87: Control device; 88: Storage unit; 90: Laser processing device; 100, 110, 120: Clocks. Detailed Implementation

[0022] Implementation Method 1

[0023] ***Overview of Clocks***

[0024] Figure 1 This is the front view of the clock.

[0025] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0026] The clock 100 in this embodiment is a three-hand analog wristwatch.

[0027] The watch 100 consists of a main body 5, a dial 30, an hour hand 1, a minute hand 2, a second hand 3, a crown 9, a first strap 11, a second strap 12, etc.

[0028] The main body 5 is the case, made of hard metals such as stainless steel and titanium. Additionally, the movement (not shown) that drives the hands is housed on the reverse side of the dial 30 of the main body 5. A crown 9 is located at the 3 o'clock position on the main body 5.

[0029] A pair of lugs 6 are provided on the 1 o'clock and 11 o'clock sides of the main stem 5. A first watch band 11 is installed at the pair of lugs 6. The first watch band 11 is a metal watch band made of multiple metal blocks connected together. Similarly, a pair of lugs 7 are provided on the 5 o'clock and 7 o'clock sides of the main stem 5. A second watch band 12 is installed at the pair of lugs 7. The second watch band 12 is a metal watch band of the same type as the first watch band 11.

[0030] The dial 30 features hour markers 13, a date window 14, and other markings. Additionally, markers and minute scales can be placed on the dial 30. A through-hole 8 is formed in the center of the circular dial 30 for the hands' shafts to pass through, housing the hour hand 1, minute hand 2, and second hand 3. Furthermore, in... Figure 1 In this context, the clock 100 is defined as a three-hand analog clock with an hour hand 1, a minute hand 2, and a second hand 3, but it is not limited to this. Any clock with a dial is acceptable, such as a digital clock or a smartwatch.

[0031] Here, the dial 30 uses the same tamahagane (steel) as the material used in Japanese swords, and features a hamon (blade pattern) 23 formed during the preparation process of the substrate, which includes the application of sintered clay and the heating and cooling process, as described later. Furthermore, tamahagane is steel that is smelted using the tatara iron-making method, an ancient iron-making process, and is the raw material for Japanese swords. Its main component is more than 90% iron, with the remainder consisting of carbon and other materials.

[0032] Pattern 23 is a wavy line segment representing the boundary between the martensitic region 21 and the austenitic region 22, which has a lower hardness than the martensitic region 21. Regarding the actual pattern, the ribbing pattern 23 is seen as a hamon (horn-like) pattern due to the difference in hue between the white martensitic region 21 and the black austenitic region 22, but for ease of explanation, the boundary line between the two is described as pattern 23. The same applies in the following explanation. Furthermore, while pattern 23 is represented by wavy solid lines, the actual boundary portion includes a gradually changing section. Also, pattern 23 is not limited to a wavy shape; for example, it could be a straight-edged pattern resembling a straight line. Even with this pattern, the ribbing pattern can be seen through the difference in hue between the white martensitic region 21 and the black austenitic region 22, which forms the base metal.

[0033] exist Figure 1 In this example, the pattern 23, which marks the boundary between the martensitic region 21 and the austenitic region 22, is set at approximately 11:30 and 6:30 o'clock on the dial 30. In other words, the dial 30 is a watch component made of tamahagane steel, possessing a martensitic region 21 and an austenitic region 22 with a lower hardness than the martensitic region 21. Furthermore, the pattern 23 is set along the line connecting the 12 and 6 o'clock positions on the dial 30.

[0034] In a preferred embodiment, the area ratio of austenite region 22 to martensite region 21 is 6:4. However, this ratio is not limited; it is acceptable as long as the area of ​​austenite region 22 is larger than the area of ​​martensite region 21.

[0035] Furthermore, from the viewpoint of ease of processing, the parts that require openings on the dial 30, such as the through hole 8 and the date window 14, are preferably located in the austenitic region 22.

[0036] ***Substrate Manufacturing Method***

[0037] Figure 2 This is a top view of the substrate. Figure 3 This is a flowchart illustrating the process of preparing the substrate. Figure 4 yes Figure 2 A cross-sectional view of section bb.

[0038] Before describing the manufacturing method of the dial 30, the manufacturing method of the substrate 40, which forms the martensitic region 21 and the austenitic region 22 and is used to fabricate multiple dials 30, will be described here.

[0039] like Figure 2 As shown, the base material 40 is a roughly rectangular plate-shaped component. Two dials 30 are assembled on the base material 40 along its long side. The diameter of the dial 30 is, for example, approximately 33 mm. However, this value is not limited to it; it can be appropriately set according to the size and design of the clock. Furthermore, the shape of the dial is not limited to circular; it can also be a quadrilateral or polygonal dial, including barrel shapes. Additionally, the number of dials is not limited to two; multiple dials are acceptable, such as three or four.

[0040] In other words, the substrate 40 is rectangular, and multiple dials 30, which serve as clock components, are assembled on the substrate 40.

[0041] The substrate 40 has an austenitic region 22 formed on its lower side and a martensite region 21 formed on its upper side along the extension direction of its short side. The area ratio of the austenitic region 22 to the martensite region 21 is set to approximately 6:4. This is because if the area of ​​the first region forming the martensite region 21 is too large, cracks will occur due to the difference in internal stress between the martensite region 21 and the austenitic region 22 during cooling in the heating and cooling process described later. Therefore, in order to minimize the loss of the substrate 40 and prevent cracking, it is preferable that the martensite region 21 is smaller than the austenitic region 22.

[0042] Furthermore, the thickness of the substrate 40 is processed to, for example, approximately 0.4 mm. However, it is not limited to this value. Moreover, the front surface 40a of the substrate 40 is polished to reveal the pattern 23 of the blade pattern.

[0043] Next, use Figure 3 The manufacturing method of such substrate 40 will be described.

[0044] In step S11, tamahagane, the raw material, is manufactured using an ancient iron-making method known as tatami refining.

[0045] In step S12, a so-called hydrostatic process is performed, in which the tamahagane is heated and stretched thinner, then quenched and divided (small cut).

[0046] In step S13, a so-called forging process is performed, in which mud and wood ash are poured onto the segmented raw materials, and the mixture is heated to the point of near melting before being hammered. This forging process is repeated multiple times. This process adjusts the carbon content, removes slag components, and modifies the microstructure.

[0047] In step S14, as a finishing process in the forging step, the shape of the raw material is adjusted to the shape of the substrate 40. For example, it is finished as follows: Figure 2 It is a rectangular shape as shown.

[0048] In step S15, a process is performed to coat the refractory clay with a temperature-adjusting component 42 on the front side 40a of the substrate 40. The temperature-adjusting component 42 is refractory clay that has been well-mixed with charcoal powder, grinding stone powder, etc. For example... Figure 4As shown, in a preferred embodiment, the temperature adjustment member 42 is coated on the entire front side 40a of the substrate 40, but it is thinly coated in the first region, which is the martensitic region 21, and thicker in the second region, which is the austenitic region 22. Specifically, it is coated with a thickness t1 in the first region, which is the martensitic region 21, and with a thickness t2, which is thicker than t1, in the second region, which is the austenitic region 22. For example, the thickness t1 is approximately 0.1 mm to 0.2 mm, and the thickness t2 is approximately 1.0 mm. However, this thickness is not limited to these values. Furthermore, in the case of a Japanese sword, the hardening clay is applied to both sides of the blade, but in the case of the substrate 40, which is a dial, it is sufficient to form the hamon (blade pattern) on the front side 40a, so it is not necessary to coat the back side 40b with the temperature adjustment member 42. While the temperature adjustment member 42 is required in the second region, it may not be necessary in the first region. This is because it was discovered that in the quenching process described later, if a difference in cooling time is given between the two regions, it is possible to distinguish between the austenitic region 22 and the martensitic region 21.

[0049] In a preferred embodiment, the coating of the temperature adjustment component 42 is performed by hand by a skilled craftsman. This results in a unique hamon (blade pattern) pattern 23. Furthermore, the method is not limited to hand application; any coating method that allows for varying the thickness of the temperature adjustment component 42 in the first and second regions is acceptable. For example, screen printing can also be used. In this case, after screen printing a temperature adjustment component 42 of thickness t1 onto the entire front surface 40a of the substrate 40, a mask with selective openings in the second region is used to overlap the coating until a thickness t2 is achieved. This results in a uniform hamon pattern 23. Additionally, screen printing is not the only method; a dispenser or inkjet printing can also be used to coat the temperature adjustment component 42. These methods allow for efficient application of the hamon paste.

[0050] In step S16, a heating-cooling process is performed whereby the substrate 40 coated with the temperature-adjusting member 42 is heated in a furnace and then immersed in water for rapid cooling. The heating temperature is preferably 727°C or higher. As a result, the thin first region of the temperature-adjusting member 42 cools faster than the second region, thus forming a martensitic structure where carbon atoms have entered iron atoms, forming martensitic region 21. On the other hand, the second region forms an austenitic structure with a lower hardness than martensite, forming austenitic region 22. Furthermore, the abrasive coating process and the heating-cooling process are equivalent to a quenching process.

[0051] In step S17, after removing the temperature adjustment member 42, a grinding process is performed to grind the front surface 40a of the substrate 40 while changing the roughness of the grinding stone. Specifically, the front surface 40a is ground by gradually changing from a small-grit grinding stone to a large-grit grinding stone. Furthermore, the grinding is not limited to manual grinding based on grinding stones; any method capable of grinding the front surface 40a of the substrate 40 is acceptable, such as using a polishing machine, a grinding disc, or other grinding equipment. This allows for efficient grinding.

[0052] Through the above procedures, prepare as follows Figure 2 The substrate 40, as shown, has martensitic regions 21 and austenitic regions 22, and is capable of assembling multiple dials 30.

[0053] In other words, in the preparation process of the substrate 40, a first region on the front side 40a of the substrate 40 is provided with a thinner coating of the temperature adjustment member 42 and a second region on the front side 40a of the substrate 40 with a thicker coating of the temperature adjustment member 42. After heating the substrate 40, it is cooled to form the martensitic region 21 and the austenitic region 22.

[0054] ***Dial Manufacturing Method***

[0055] Figure 5 It is a flowchart showing the manufacturing process of the watch dial. Figure 6 This is a schematic diagram of the laser processing device. Figure 7 It is a diagram of the manufacturing process of the watch dial. Figure 8 It is a diagram of the manufacturing process of the watch dial. Figure 9 yes Figure 8 A cross-sectional view of the cc section.

[0056] Here, with Figure 5 The process of manufacturing the dial 30 from the substrate 40 formed in the substrate preparation process is explained in detail.

[0057] Step S21 and Figure 3 The preparation process of the substrate 40 described herein is the same.

[0058] In step S22, a protective film is adhered to the substrate 40. Specifically, as shown in... Figure 7 As shown, a protective film 45 is adhered to the front side 40a of the substrate 40 in a manner that covers the portion that forms the dial 30. The protective film 45 can be, for example, a transparent polyester film. Alternatively, the protective film 45 can be adhered to the entire front side 40a of the substrate 40.

[0059] In step S23, the substrate 40 is cut from the reverse side 40b, reducing its thickness. In a preferred embodiment, the reverse side 40b of the substrate 40 is cut using a milling machine to make the thickness of the substrate 40 uniform. The thickness of the substrate 40 is set to a size, for example, approximately 0.4 mm, which is the same as the designed thickness of the dial 30. At this time, processing is performed with the front side 40a of the substrate 40 facing down, but the front side 40a is not damaged due to the protective film 45. In other words, the thickness of the dial 30 is constant.

[0060] In step S24, a pair of reference holes 43 are formed at both ends of the substrate 40. For example... Figure 7 As shown, a pair of reference holes 43 are positioning holes for machining the dial 30, and are located next to each short side of the substrate 40. In a preferred embodiment, the reference holes 43 are drilled at predetermined positions using a drilling machine. Figure 7 As shown, a pair of reference holes 43 are located in the austenite region 22, making drilling easy. Furthermore, after drilling through the reference holes 43, two mounting holes 34 for locating pins are formed on the reverse side 40b of the substrate 40 using a drilling machine. Figure 9 Mounting hole 34 is not a through hole, but a blind hole drilled to half the thickness of dial 30.

[0061] pass Figure 6 The laser processing apparatus 90 shown will proceed to steps S25 to S26. First, the structure of the laser processing apparatus 90 will be described.

[0062] The laser processing device 90 consists of a laser oscillator 81, a transmission optical system 82, an irradiation unit 83, a processing worktable 85, and a control device 87.

[0063] The laser oscillator 81 is an infrared laser oscillator. In a preferred embodiment, a solid-state laser oscillator corresponding to a femtosecond laser is used. However, it is not limited to this; any infrared laser oscillator can be used, or oscillators such as gas lasers, semiconductor lasers, and liquid lasers can also be used.

[0064] The transmission optical system 82 is an optical path that transmits the laser generated by the laser oscillator 81 to the irradiation unit 83, and is configured to include multiple reflectors.

[0065] The irradiation unit 83 is an irradiation nozzle that focuses the laser light and irradiates the workpiece, and is configured to include a focusing lens.

[0066] The machining worktable 85 is an XY worktable that, according to the instructions from the control device 87, causes the mounted workpiece to move in a plane according to the scanning path pattern of the laser irradiation.

[0067] The control device 87 is the controller of the laser processing apparatus 90, configured to include one or more processors to uniformly control the operation of each part. The control device 87 includes a storage unit 88 containing non-volatile memory. The storage unit 88 stores control programs and various data that control the operation of the laser processing apparatus 90. Among the various data are the irradiation conditions and scanning path pattern data for each processing area. Additionally, the irradiation conditions include parameters such as output frequency, scanning speed, laser output, and scanning path spacing.

[0068] In step S25, as Figure 7 As shown, a through hole 8 is formed at the center of the dial 30 for the pointer shaft to pass through. Specifically, as... Figure 6 As shown, a substrate 40 is placed on the processing stage 85 of the laser processing apparatus 90, and a through hole 8 is formed by femtosecond laser irradiation. Furthermore, a pair of locating pins (not shown) corresponding to a pair of reference holes 43 on the substrate 40 are provided on the processing stage 85, and the substrate 40 is fixed in a state where it is positioned by these locating pins. The femtosecond laser has a small pulse width, and laser irradiation is completed earlier than heat transfer to the substrate 40, thus preventing cracks on the front surface 40a of the substrate 40 caused by heat, resulting in a neat through hole 8. In addition, after forming the through hole 8, a date window 14 is also formed by femtosecond laser irradiation. Figure 7 This indicates the state. For example... Figure 7 As shown, the through hole 8 and the date window 14 are both located in the austenite region 22, so drilling is easy.

[0069] In step S26, the dial 30 is cut from the substrate 40. The cut is made along... Figure 7 The circular shape of the dial 30, shown by the dashed line, is subjected to multiple femtosecond laser irradiations. During this process, the irradiation conditions are varied in the martensitic region 21 and the austenitic region 22. Specifically, the irradiation energy is increased when machining the martensitic region 21 compared to when machining the austenitic region 22. In other words, the output is greater when machining the harder martensitic region 21 than when machining the austenitic region 22. Figure 8 This is a top view of the cut dial 30, where the area ratio of the austenitic region 22 to the martensite region 21 is 6:4. In other words, during the cutting process, the cutting is performed in a manner that makes the area of ​​the martensite region 21 smaller than the area of ​​the austenitic region 22.

[0070] In other words, the manufacturing method of the dial 30, a component of a watch, includes: a preparation step, in which a substrate 40 having martensitic regions 21 and austenitic regions 22 formed on a steel substrate is prepared; a cutting step, in which the substrate 40 is cut from its reverse side 40b to thin it; and a removal step, in which the thinned substrate 40 is removed by laser processing to form the shape of the dial 30, a component of a watch. Furthermore, in the removal step, the output of the laser processing is varied in the martensitic regions 21 and austenitic regions 22, with a larger output when processing the martensitic regions 21 than when processing the austenitic regions 22. Additionally, in the drilling and removal steps, a pair of reference holes 43 are fixed in the peripheral portion of the substrate 40, excluding the portion that becomes the dial 30, and each step is performed accordingly.

[0071] In step S27, as Figure 9 As shown, the locating pin 35 is fitted into a pair of mounting holes 34 on the reverse side 30b of the dial 30 formed in step S24. Figure 8 As shown, the locating pins 35 are installed on the 1 o'clock and 5 o'clock sides of the dial 30 in the austenitic region 22. Furthermore, after installation, the fitting of the locating pins 35 can be strengthened by adhesive or brazing. The locating pins 35 are the locating pins of the dial 30, and a pair of locating holes are provided on the movement (not shown) on which the dial 30 is mounted, at positions corresponding to the pair of locating pins 35.

[0072] In step S28, a protective film 36 is applied to the front surface 30a of the dial 30. As the protective film 36, to prevent rust on the front surface 30a, a polysilazane coating is used, for example. However, this is not a limitation; for example, DLC (Diamond-Like Carbon) coating or ALD (Atomic Layer Deposition) coating may also be applied. By applying these coatings, a rust-proof effect can be achieved without damaging the pattern 23 of the front surface 30a.

[0073] In step S29, hour markers 13 are installed on the front surface 30a of the dial 30. In a preferred embodiment, the hour markers 13 are installed on the front surface 30a using double-sided tape or adhesive. Alternatively, when using inscribed hour markers, mounting holes are formed on the front surface 30a of the dial 30 by femtosecond laser irradiation, and then the hour markers are installed.

[0074] As described above, the following effects can be obtained from the manufacturing method of the dial 30 as a clock component, the dial 30, and the clock 100 according to this embodiment.

[0075] The manufacturing method of the dial 30 as a watch component includes: a preparation step, preparing a substrate 40 on a steel substrate having a martensitic region 21 and an austenitic region 22 formed thereon; a cutting step, thinning the substrate 40 from the reverse side 40b of the substrate 40 by cutting; and a removal step, removing the thinned substrate 40 by laser processing into the shape of the dial 30 as a watch component.

[0076] Due to the high hardness of tamahagane (a type of stainless steel), milling during the removal process can cause surface damage and result in jagged contours. In contrast, laser processing avoids this damage and produces aesthetically pleasing contours.

[0077] On the other hand, for the cutting process of the reverse side 40b of the substrate 40 (non-appearance part), for example, by cutting it with a milling machine to make it thinner, a wide range can be processed efficiently in a short time compared with laser processing.

[0078] Furthermore, the martensitic region 21 in the completed dial 30 exhibits a pattern 23 equivalent to the hamon (blade pattern) of a Japanese sword.

[0079] Therefore, a method for manufacturing a clock component can be provided, which can be used in watches and the like, and can manufacture a dial 30 as a clock component with high quality and efficiency. This clock component has a hamon (blade pattern) that is a symbolic element of the blade of a Japanese sword.

[0080] In addition, in the preparation process of the substrate 40, a first region on the front side 40a of the substrate 40 is provided with a thinner coating of the temperature adjustment member 42 and a second region on the front side 40a of the substrate 40 with a thicker coating of the temperature adjustment member 42. After heating the substrate 40, it is cooled to form a martensitic region 21 and an austenitic region 22.

[0081] Thus, a martensite region 21 and an austenite region 22 are formed on the front side 40a of the substrate 40, so that a dial 30, which is a clock component, can be cut out with a pattern 23 of the blade pattern of a Japanese sword.

[0082] Furthermore, during the removal process, the irradiation conditions for laser processing are varied in the martensite region 21 and the austenite region 22. The irradiation energy is increased when processing the martensite region 21 compared to when processing the austenite region 22. To increase the irradiation energy, conditions such as increasing the laser output or extending the pulse width can be selected.

[0083] Therefore, by varying the laser irradiation conditions according to the hardness, the cutting process can be performed efficiently.

[0084] In addition, the substrate 40 is rectangular, and multiple dials 30, which serve as clock components, are assembled on the substrate 40.

[0085] Therefore, the dial 30 can be efficiently cut from the substrate 40, thus enabling the substrate 40, which is made of precious Tamahagane, to be used without waste.

[0086] In addition, after the preparation process of the substrate 40, there is a process of forming a protective film 45 as a protective film on the front side 40a of the substrate 40.

[0087] Therefore, damage to the front side 40a of the substrate 40 can be prevented in the next cutting process and subsequent processes.

[0088] In addition, during the removal process, the martensite region 21 is removed in a manner that makes its area smaller than that of the austenite region 22.

[0089] Therefore, the loss of the substrate 40 can be minimized without causing cracks in the substrate 40.

[0090] In addition, the watch part, dial 30, also has a perforation process. After the cutting process, a through hole 8 for the pointer shaft to pass through is formed in the austenitic region 22 of dial 30 by laser processing.

[0091] Therefore, the through hole 8 is located in the austenite region 22, making it easy to perform the piercing process.

[0092] In addition, during the perforation and cutting processes, a pair of reference holes 43 are fixed in the peripheral portion of the substrate 40, excluding the portion of the dial 30 that serves as a watch component, and each process is performed.

[0093] Therefore, a pair of reference holes 43 are provided in the periphery of the substrate 40 for positioning and fixing, so that the substrate 40, which is made of precious tamahagane, can be used without waste.

[0094] In addition, a dial 30 made of tamahagane as a raw material is provided as a watch component. The dial 30 has a martensitic region 21 and an austenitic region 22 with a lower hardness than the martensitic region 21.

[0095] Thus, the dial 30 has a martensitic region 21 that presents a pattern 23 equivalent to the blade pattern of a Japanese sword.

[0096] Therefore, it is possible to provide watch parts that have a hamon (blade pattern) that is a symbolic element of the blade of a Japanese sword, which can be used in watches and the like.

[0097] In addition, the clock component is dial 30, and the thickness of dial 30 is constant.

[0098] Since Japanese swords are blades, their thickness decreases from the vicinity of the blade pattern to the edge. However, in watch parts, the thickness can be constant. This structure allows the pattern 23 of the blade pattern to be used as a design element.

[0099] In addition, the dial 30 has a through hole 8 for the pointer shaft to pass through, and the through hole 8 is located in the austenitic region 22.

[0100] Therefore, the through hole 8 is located in the austenite region 22, making it easy to pierce.

[0101] Furthermore, the area ratio of austenite region 22 to martensite region 21 is 6:4. Therefore, the loss of substrate 40 can be minimized without causing cracks in the substrate 40.

[0102] Furthermore, the boundary line between the martensitic region 21 and the austenitic region 22 is set along the line connecting the 12 o'clock and 6 o'clock positions of the dial 30. In a preferred embodiment, it is set along the line connecting approximately 11:30 and approximately 6:30 o'clock positions of the dial 30.

[0103] Thus, a crescent-shaped pattern 23 can be obtained on the left side of the dial 30.

[0104] In addition, the watch 100 has a dial 30.

[0105] Therefore, it is possible to provide a clock 100 with a dial 30 as a clock component, which has a hamon (blade pattern) as a symbolic element of the blade of a Japanese sword. In other words, it is possible to provide a clock 100 with a dial 30 and elements resembling an authentic Japanese sword.

[0106] Implementation Method 2

[0107] ***Different Methods-1***

[0108] Figure 10 This is the front view of the clock in Embodiment 2, and... Figure 1 correspond.

[0109] In the above embodiment, the case where the hane pattern 23 is provided on the dial 30 of the watch 100 has been described, but it is not limited to this. For example, the hane pattern may also be provided on the watch strap. Hereinafter, the same reference numerals will be used to mark the same parts as in the above embodiment, and repeated descriptions will be omitted.

[0110] like Figure 10 As shown, in addition to the dial 30 described above, the watch 110 of this embodiment also has a first watch strap 51 and a second watch strap 52 with a blade pattern 24.

[0111] The first watch strap 51 is composed of multiple blocks 17 made of tamahagane (a type of stainless steel). Like the dial 30, the blocks 17 are watch components cut from a base material made of tamahagane. Figure 10 As shown, it has martensitic region 21 and austenitic region 22, with a blade pattern 24 along its boundary line. Furthermore, the substrate is a slender rectangle with the same width as the block 17, and includes preparation steps for the quenching process. Figure 3 The description is the same as in the previous section. In addition, the process of cutting block 17 from the substrate, besides cutting out the shape, is similar to... Figure 5 The explanations are largely the same.

[0112] like Figure 10 As shown, the blade pattern 24 in the first strap 51 is arranged in a manner that connects to the upper side of the pattern 23 on the dial 30.

[0113] Similarly, the second watchband 52 is also composed of multiple blocks 17 made of tamahagane steel. The blocks 17 are the same as those in the first watchband 51, and have a hamon (blade pattern) pattern 24.

[0114] like Figure 10 As shown, the blade pattern 24 in the second strap 52 is arranged to be connected to the lower side of the pattern 23 on the dial 30.

[0115] In other words, the watch 110 has a dial 30, a first strap 51 and a second strap 52 that engages with the first strap 51. Both the first strap 51 and the second strap 52 have martensitic regions 21 and austenitic regions 22. The pattern 24 that forms the boundary line is arranged in a manner that connects the pattern 23 of the dial 30 in the first strap 51 and the second strap 52.

[0116] As described above, the clock 110 according to this embodiment can achieve the following effects in addition to the effects described in the above embodiment.

[0117] The watch 110 has a dial 30, a first strap 51 and a second strap 52 that engages with the first strap 51. Both the first strap 51 and the second strap 52 have martensitic regions 21 and austenitic regions 22. The pattern 24 that forms the boundary line is connected in the first strap 51 and the second strap 52 via the pattern 23 of the dial 30.

[0118] Thus, along the line segment connecting 11:30 to 6:30 of the clock 110, a blade pattern 24, 23, 24 is formed connecting the first strap 51, the dial 30, and the second strap 52.

[0119] Therefore, it is possible to provide a clock 110 with a hamon (blade pattern) that is a symbolic element of the blade of a Japanese sword.

[0120] Implementation Method 3

[0121] ***Different Ways-2***

[0122] Figure 11 This is the front view of the clock in embodiment 3, and... Figure 1 correspond. Figure 12 This is the front view of the clock.

[0123] In the above embodiment, the pattern 23 of the blade pattern is described as a wavy pattern along a straight line, but it is not limited to this. For example, it can also be a pattern along an arc or curve. Hereinafter, the same reference numerals are used to mark the same parts as in the above embodiment, and repeated descriptions are omitted.

[0124] Figure 11 The clock 120 of this embodiment shown has a dial 38 on the front and a rotating hammer 80 on the back. Figure 12 The 80 is an analog mechanical clock that displays the time by rotating a mainspring through the rotation of a rotating hammer 80.

[0125] The dial 38 features a power reserve indicator 49, a mark 47, a logo 48, and a pattern 25. The power reserve indicator 49 shows the operable time from when the watch 120 is placed down until the timing stops. Figure 11 In the center, a fan-shaped energy storage display section is provided in the direction from 11 o'clock to 1 o'clock on the dial 38.

[0126] Mark 47 is, for example, a mark designed with the letter S, placed on the 3 o'clock side. Mark 48 is a product mark paired with mark 47, positioned below mark 47. However, the positions of marks 47 and 48 are not limited to these specific locations.

[0127] Dial 38 has a crescent-shaped blade pattern 25 on its 9 o'clock side. Dial 38 is manufactured through the same process as dial 30, and has martensitic regions 21 and austenitic regions 22, with the pattern 25 formed at their boundaries. Differences in the pattern can be adjusted by the coating method of the temperature adjustment component 42 in the hardening clay coating process.

[0128] Pattern 25 is set in a crescent shape along the outer perimeter of the dial 38 within the range of 6 o'clock to 12 o'clock. In addition, it is not limited to an arc, and the pattern can also be set along a curve.

[0129] like Figure 12 As shown, the reverse side of the clock 120 has a skeletal structure, with a transparent back cover 56 mounted on the main body 5. The rotating hammer 80 can be observed through the back cover 56.

[0130] The rotating hammer 80 consists of a semi-circular body 75 and a hammer part 76 mounted along the outer periphery of the body 75. The hammer part 76 is a strip-shaped component along the arc and is fixed to the body 75 by three fixing pins 77, thus being integrated with the body 75.

[0131] The hammer 76 has a crescent-shaped blade pattern 26 on its 3 o'clock side. The hammer 76 is manufactured using the same process as the dial 30, and has a martensitic region 21 and an austenitic region 22, with the pattern 26 formed at their boundaries. The pattern 26 is located between the inner and outer circumferential arcs of the hammer 76.

[0132] Furthermore, the watch parts that form the blade pattern are not limited to the dial, strap, or rotating hammer; any watch part that can form the pattern is acceptable, such as the main body, back cover, mounting plate, or bezel.

[0133] As described above, the clock 120 according to this embodiment can achieve the following effects in addition to the effects described in the above embodiment.

[0134] The clock 120 includes: a dial 38 with a crescent-shaped pattern 25; and a rotating hammer 80 with a crescent-shaped pattern 26. In other words, the clock 120 has crescent-shaped blade-like patterns 25 and 26 on both sides. Furthermore, the blade-like pattern can also be applied to multi-axis, multi-functional clocks like the clock 120.

[0135] Therefore, it is possible to provide a clock 120 with a hamon (blade pattern) that is a symbolic element of the blade of a Japanese sword.

Claims

1. A method for manufacturing a watch component, comprising the following steps: Preparation process: preparing a substrate with martensite and austenite regions having boundary lines to be formed on the tamahagane steel. A cutting process, wherein the thickness of the substrate is reduced by cutting from the reverse side of the substrate; and The cutting process involves using laser processing to cut the thinned substrate into the shape of a watch component. In the preparation process, A first region on the front side of the substrate is provided with a thin coating of the temperature regulating component, and a second region on the front side of the substrate is provided with a thicker coating of the temperature regulating component. The substrate is heated and then cooled to form the martensitic region and the austenitic region.

2. The method for manufacturing a watch component according to claim 1, wherein, In the cutting process, The irradiation conditions for laser processing are varied in the martensitic and austenitic regions. The irradiation conditions for processing the martensitic region are higher than those for processing the austenitic region.

3. The method for manufacturing a watch component according to claim 1, wherein, The substrate is rectangular. Multiple watch components are assembled on the substrate.

4. The method for manufacturing a watch component according to claim 3, wherein, The manufacturing method of the watch component also includes the following step: forming a protective film on the front side of the substrate after the preparation step.

5. The method for manufacturing a watch component according to claim 3, wherein, In the removal process, the removal is performed in such a way that the area of ​​the martensite region is smaller than the area of ​​the austenite region.

6. The method for manufacturing a watch component according to claim 1, wherein, The clock component is the dial. The manufacturing method of the watch component also includes a drilling process: after the cutting process, a through hole for the pointer shaft to pass through is formed in the austenitic region of the dial by laser processing.

7. The method for manufacturing a watch component according to claim 6, wherein, In the perforation process and the cutting process, the peripheral portion of the substrate other than the portion that becomes the watch component is fixed, and each process is performed.

8. A watch component, which is manufactured using tamahagane (a type of stainless steel) as raw material, by means of the method for manufacturing a watch component according to claim 1, wherein, The watch component has a martensitic region with a boundary line and an austenitic region with a lower hardness than the martensitic region.

9. The watch component according to claim 8, wherein, The clock component is the dial. The thickness of the dial is constant.

10. The watch component according to claim 9, wherein, The dial has a through hole through which the pointer shaft passes. The through hole is located in the austenite region.

11. The watch component according to claim 10, wherein, The area ratio of the austenite region to the martensite region is 6:

4.

12. The watch component according to claim 10, wherein, The boundary line is set along the line connecting the 12 o'clock and 6 o'clock positions on the dial.

13. A clock having the dial as described in claim 9 or 10.

14. A clock, comprising: The dial as described in claim 9 or 10; First watch strap; and The second watch strap engages with the first watch strap. Both the first and second strips have the martensitic and austenitic regions. The boundary lines between the martensitic region and the austenitic region are configured to be connected in the first and second bands.

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