WO2018101332A1 - Timepiece case - Google Patents

Timepiece case Download PDF

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Publication number
WO2018101332A1
WO2018101332A1 PCT/JP2017/042815 JP2017042815W WO2018101332A1 WO 2018101332 A1 WO2018101332 A1 WO 2018101332A1 JP 2017042815 W JP2017042815 W JP 2017042815W WO 2018101332 A1 WO2018101332 A1 WO 2018101332A1
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WO
WIPO (PCT)
Prior art keywords
fitting surface
watch case
less
lid member
roughness curve
Prior art date
Application number
PCT/JP2017/042815
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French (fr)
Japanese (ja)
Inventor
治彦 寺園
林　真一
Original Assignee
京セラ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 京セラ株式会社 filed Critical 京セラ株式会社
Priority to EP17875698.7A priority Critical patent/EP3550383B1/en
Priority to CN201780073184.6A priority patent/CN109997085B/en
Priority to JP2018525482A priority patent/JP6419391B2/en
Publication of WO2018101332A1 publication Critical patent/WO2018101332A1/en

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    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C10/00—Arrangements of electric power supplies in time pieces
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B37/00—Cases
    • G04B37/08—Hermetic sealing of openings, joints, passages or slits
    • G04B37/11—Hermetic sealing of openings, joints, passages or slits of the back cover of pocket or wrist watches
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B37/00—Cases
    • G04B37/22—Materials or processes of manufacturing pocket watch or wrist watch cases
    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G17/00—Structural details; Housings
    • G04G17/02—Component assemblies

Definitions

  • This disclosure relates to a watch case.
  • a watch case which is an exterior part used for housing a movement or the like, is made of ceramics.
  • Patent Document 1 discloses a watch case in which a part or the whole of a case and a back cover is made of a ceramic or artificial gemstone material.
  • the watch case of the present disclosure is made of ceramics. Moreover, the fitting surface facing the lid member fitted together is provided.
  • the fitting surface has an arithmetic average roughness Ra obtained from the roughness curve of 0.6 ⁇ m or less and a protruding peak height Rpk obtained from the roughness curve of 0.9 ⁇ m or less.
  • the watch case of the wristwatch is configured so that the lid member can be attached or detached (hereinafter referred to as “detaching”).
  • This lid member is a component that prevents water, dust, and the like from entering the inside of the watch case.
  • the watch case is made of ceramics
  • the fitting surface of the watch case facing the lid member in the fitting with the lid member (hereinafter simply referred to as the fitting surface). May wear out easily). And if the fitting surface in a timepiece case wears out, water, dust, etc. will penetrate
  • the watch case of the present disclosure can maintain waterproofness and dustproofness for a long period of time because the fitting surface is not easily worn even when the lid member is repeatedly attached and detached.
  • the watch case of the present disclosure will be described in detail with reference to FIG.
  • the lid member is fitted from below in the drawing, and the hatched surface is the fitting surface 2.
  • the watch case 1 of the present disclosure is made of ceramics.
  • the ceramic is aluminum oxide ceramics, zirconium oxide ceramics, silicon nitride ceramics, silicon carbide ceramics, or the like.
  • the ceramics if the watch case 1 of the present disclosure is made of zirconium oxide ceramics, it is difficult to damage even after long-term use, so that the aesthetic appearance is hardly impaired.
  • the zirconium oxide-based ceramic is a ceramic mainly composed of zirconium oxide, and contains 70% by mass or more of zirconium oxide out of 100% by mass of all components constituting the ceramic.
  • the content of the main component can be calculated by the following method. First, the watch case 1 is measured using an X-ray diffractometer (XRD), and the obtained 2 ⁇ (2 ⁇ is a diffraction angle) value is identified by a JCPDS card. At this time, when the watch case 1 is made of a zirconium oxide ceramic, the presence of zirconium oxide is confirmed.
  • XRD X-ray diffractometer
  • ICP Inductively Coupled Plasma
  • Zr zirconium oxide
  • ZrO 2 zirconium oxide
  • content converted here is 70 mass% or more, it is a zirconium oxide ceramic. In addition, it can confirm with the same method also about other ceramics.
  • the watch case 1 of the present disclosure includes a fitting surface 2 that faces the lid member to be fitted.
  • the fitting surface 2 has an arithmetic average roughness Ra obtained from the roughness curve of 0.6 ⁇ m or less and a protruding peak height Rpk obtained from the roughness curve of 0.9 ⁇ m or less.
  • the arithmetic average roughness Ra is a value defined in JIS B 0601 (2013).
  • the protruding peak height Rpk is defined in JIS B 0671-2 (2002) and is defined as follows. First, in the central portion of the load curve including 40% of the measurement points of the roughness curve, the straight line where the dividing line of the load curve drawn with the difference in load length ratio being 40% is the most gentle is defined as the equivalent line. . Next, a core portion is defined between two height positions where the equivalent straight line intersects the vertical axis at the load length ratios of 0% and 100%. In the roughness curve, the average height of the protruding ridge above the core is the protruding ridge height Rpk.
  • the watch case 1 of the present disclosure satisfies the above-described configuration, the unevenness of the fitting surface 2 is small and the protruding peak portion is small, so that it protrudes even when the lid member is repeatedly attached and detached. Mountains are less likely to wear. Therefore, the watch case 1 of the present disclosure can maintain waterproofness and dustproofness for a long period of time even when the lid member is repeatedly attached and detached.
  • the cover member is formed by the presence of a peak. Easy to put on and take off.
  • the fitting surface 2 in the watch case 1 of the present disclosure may have a core portion level difference Rk obtained from a roughness curve of 0.8 ⁇ m or less.
  • the level difference Rk of the core part is defined in JIS B 0671-2 (2002) and is an index indicating the level difference between the upper side and the lower side of the core part described above in the roughness curve.
  • the fitting surface 2 of the watch case 1 of the present disclosure has a small variation in the height of the core portion, so that the lid member contacts the portion corresponding to the core portion of the fitting surface 2. Even so, the part is less likely to wear. Therefore, even if the attachment and detachment of the lid member is repeated, the waterproofness and dustproofness can be maintained longer.
  • the level difference Rk of the core part is 0.11 ⁇ m or more, the lid member can be easily attached and detached while having excellent waterproof properties and excellent dust resistance.
  • the ratio Rpk / Rk between the level difference Rk of the core part and the protruding peak part height Rpk may be 0.7 or less. If such a configuration is satisfied, the fitting surface 2 of the watch case 1 of the present disclosure has a surface property in which the protruding peak portion is small and the height variation of the core portion is small. Even if it repeats, waterproofness and dustproofness can be maintained longer. In addition, if the ratio Rpk / Rk is 0.5 or more in the fitting surface 2, the lid member can be easily attached and detached while having excellent waterproof properties and excellent dust resistance.
  • the fitting surface 2 in the watch case 1 of the present disclosure may have a negative skewness Rsk obtained from a roughness curve.
  • the skewness Rsk is defined in JIS B 0601 (2013), and is an index indicating the ratio of the peak portion to the valley portion when the average roughness height is taken as the center line. If the skewness Rsk is negative, it indicates that the region that is a peak is larger than the valley. If such a configuration is satisfied, even if the lid member is repeatedly attached and detached, the crest portion itself in the fitting surface 2 becomes difficult to be chipped, so that the waterproofness and dustproofness can be maintained for a longer time.
  • the fitting surface 2 in the watch case 1 of the present disclosure may have an average peak height Rpm determined from a roughness curve of 0.5 ⁇ m or less.
  • the average peak height Rpm is the average height of the highest peak part included in each section in the section in which only the reference length is extracted from the roughness curve in the direction of the average line and the reference length is divided into five equal parts.
  • the height from the top to the top is Rpi, it is the average value of Rpi in these five sections. If such a configuration is satisfied, the fitting surface 2 of the watch case 1 of the present disclosure has few protruding peaks, and therefore, the wear on the fitting surface 2 is small even when the lid member is repeatedly attached and detached. The waterproofness and dustproofness can be maintained longer.
  • the average peak height Rpm is 0.2 ⁇ m or more, it is easy to attach and detach the lid member while having excellent waterproofness and excellent dustproofness.
  • the fitting surface 2 in the watch case 1 of the present disclosure may have a root mean square slope R ⁇ q of 10 ° or less.
  • the root mean square slope R ⁇ q is defined in JIS B 0601 (2013), and is an index indicating the gentleness of the slope of the mountain. If such a configuration is satisfied, the slope of the peak portion on the fitting surface 2 of the watch case 1 of the present disclosure becomes gentle, and even if the lid member is repeatedly attached and detached, the peak portion is not easily worn. And dustproofness can be maintained longer.
  • the root mean square slope R ⁇ q is 3 ° or more, the lid member can be easily attached and detached while having excellent waterproof properties and excellent dust resistance.
  • the fitting surface 2 in the watch case 1 of the present disclosure may have an average interval S between the peak portions obtained from the roughness curve of 15 ⁇ m or less.
  • the average interval S between peak portions is defined by JIS B 0601 (1994) and is an index indicating the average value of the intervals between adjacent peak portions. If such a configuration is satisfied, the gap between the ridges where water, dust and the like easily enter is narrowed on the fitting surface 2 of the watch case 1 of the present disclosure, so that waterproofness and dustproofness are improved. be able to.
  • interval S of a peak part is 3 micrometers or more in the fitting surface 2, it will be easy to attach or detach a cover member, having the outstanding waterproofness and the outstanding dustproof property.
  • the arithmetic average roughness Ra, skewness Rsk, average peak height Rpm, and root mean square slope R ⁇ q in the fitting surface 2 of the watch case 1 of the present disclosure can be measured in accordance with JIS B 0601 (2013). Good. Moreover, what is necessary is just to measure the average space
  • the measurement length is 0.8 mm
  • the cutoff value is 1.0 mm
  • the scanning speed of a stylus with a stylus radius of 2 ⁇ m may be set to 1 mm / second. Then, it is only necessary to measure at least three places on the fitting surface 2 and obtain the average value.
  • the watch case 1 of the present disclosure may have a groove 3 on the fitting surface 2 as shown in FIG.
  • This groove part 3 is a part fitted to the protrusion when the cover member has a protrusion.
  • the watch case 1 of the present disclosure may have a through hole 4 that is a hole for inserting the crown in the fitting surface 2.
  • the crown is for performing a time adjustment operation of the clock from the outside.
  • the watch case 1 of the present disclosure will be described.
  • the case 1 made of a zirconium oxide ceramic will be described as an example.
  • zirconium oxide (ZrO 2 ) powder as a main raw material is put in a mill together with a solvent and a ball and pulverized to a predetermined particle size to produce a slurry.
  • granules are obtained by spray drying using a spray dryer.
  • the granule, thermoplastic resin, wax and the like are put into a kneader and kneaded while heating to obtain a clay.
  • the pellet used as the raw material for injection molding is obtained by throwing the obtained clay into a pelletizer.
  • the obtained pellets are put into an injection molding machine (injection molding machine) and injection molded to obtain a watch case-shaped molded body.
  • a molding die capable of obtaining a watch case shape is prepared based on a general injection molding method, and this is placed in an injection molding machine and injection molded. That's fine.
  • the surface property of the inner surface of the mold is transferred to the surface of the molded body. Therefore, in order to obtain the fitting surface 2 having an arithmetic average roughness Ra of 0.6 ⁇ m or less and a protruding ridge height Rpk of 0.9 ⁇ m or less, a polishing amount by surface treatment such as barrel polishing after firing is set. What is necessary is just to produce a molded object using the shaping
  • the core level difference Rk is 0.8 ⁇ m or less
  • the Rpk / Rk value is 0.7 or less
  • the skewness Rsk is negative
  • the average peak height Rpm is 0.5 ⁇ m.
  • the obtained watch case-shaped molded body is fired at a maximum temperature of 1350 ° C. or higher and 1550 ° C. or lower in an air atmosphere to obtain a sintered body.
  • the timepiece case 1 of this indication is obtained by carrying out barrel polishing of the obtained sintered compact.
  • baking conditions change with the shape and magnitude
  • raw material powder was obtained by weighing and mixing zirconium oxide (ZrO 2 ) at 94.8 mass% and stabilizer yttrium oxide (Y 2 O 3 ) at 5.2 mass%. . Then, with respect to the raw material powder 100 wt%, chromium oxide as a pigment component (Cr 2 O 3), and the iron oxide (Fe 2 O 3) and cobalt oxide (Co 3 O 4) was added 4 wt% in total . Further, water was added to these and pulverized and mixed with a ball mill to obtain a slurry.
  • ZrO 2 zirconium oxide
  • Y 2 O 3 stabilizer yttrium oxide
  • granules were obtained by spray drying using a spray dryer. Then, a thermoplastic resin and a wax were added to the obtained granules, and the mixture was put into a kneader and kneaded while heating to obtain a clay. Next, the obtained kneaded material was put into a pelletizer to obtain pellets as a raw material for injection molding. Then, the pellets were put into an injection molding machine to obtain a watch case-shaped molded body.
  • the surface property of the inner surface of the molding die installed in the injection molding machine is determined by considering the amount of polishing by barrel polishing after firing, and the mating surface of each sample has the arithmetic average roughness Ra, protruding peak shown in Table 1.
  • the height Rpk and the core level difference Rk were set.
  • this watch case-shaped compact was fired at a maximum temperature of 1500 ° C. in an air atmosphere to obtain a watch case-shaped sintered body. And each sample was obtained by carrying out barrel polishing of the obtained sintered compact.
  • the arithmetic average roughness Ra, protruding peak on the mating surface based on JIS B 0601 (2001) and JIS B 0671-2 (2002) The part height Rpk and the core level difference Rk were measured.
  • the measurement length is 0.8 mm
  • the cutoff value is 1.0 mm
  • the scanning speed of the stylus with a stylus radius of 2 ⁇ m is set to 1 mm / second, and measurement is performed at three locations on the mating surface. The average value was calculated.
  • a detachment test of the lid member was performed using each sample.
  • the lid member a stainless steel lid member fitted to the fitting surface of each sample was used.
  • the lid member was attached to and detached from each sample 10 times using a commercially available lid member closing machine.
  • the sample with the lowest necessary load reduction rate ⁇ was ranked first, and the sample with the highest necessary load reduction rate ⁇ was ranked lowest.
  • Sample No. 4 to 6 are sample Nos. Compared with 3, the required load reduction rate ⁇ was higher. From this result, it was found that if the level difference Rk of the core portion is 0.8 ⁇ m or less on the fitting surface, the waterproofness and dustproofness can be maintained for a longer time.
  • sample no. Samples Nos. 5 and 6 are sample Nos. Compared to 4, the rank of the required load reduction rate ⁇ was higher. From this result, it was found that if the ratio Rpk / Rk between the core level difference Rk and the protruding peak height Rpk is 0.7 or less on the fitting surface, the waterproofness and dustproofness can be maintained longer. .
  • the surface properties of the inner surface of the molding die installed in the injection molding machine are taken into account the amount of polishing by barrel polishing after firing, and the fitting surface of each sample becomes the skewness Rsk shown in Table 2. Except that the sample was changed as described above, the sample N o. 6 was the same as the manufacturing method. Sample No. 7 shows the sample No. of Example 1. Same as 6.
  • samples having different average peak heights Rpm were prepared on the fitting surface, and a cover member attachment / detachment test was performed.
  • the surface properties of the inner surface of the molding die installed in the injection molding machine were determined by considering the amount of polishing by barrel polishing after firing, and the average crest height Rpm shown in Table 3 for the fitting surface of each sample is shown in Table 3. Except that the sample was changed so that 8 was the same as the manufacturing method. Sample No. 9 is the sample No. of Example 2. Same as 8.
  • Example 1 The lid member attachment / detachment test was performed in the same manner as in Example 1.
  • the surface property of the inner surface of the molding die installed in the injection molding machine is taken into consideration, the amount of polishing by barrel polishing after firing, and the fitting surface of each sample has a root mean square slope shown in Table 4 Except for the change to be R ⁇ q, the sample N o. 11 was the same as the manufacturing method.
  • Sample No. 15 is the sample No. of Example 3. 11 is the same.
  • Example 1 The lid member attachment / detachment test was performed in the same manner as in Example 1.
  • the surface property of the inner surface of the molding die installed in the injection molding machine is considered, and the amount of polishing by barrel polishing after firing is taken into consideration. Except that the average interval S was changed, the sample N. 12 was the same as the manufacturing method. Sample No. 19 is the sample No. of Example 4. 12 is the same.
  • the required load reduction rate ⁇ of 16 to 18 was low. From this result, it was found that if the average interval S between the peak portions is 15 ⁇ m or less, the waterproofness and dustproofness can be maintained longer.

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  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Compositions Of Oxide Ceramics (AREA)
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  • Powder Metallurgy (AREA)

Abstract

A timepiece case according to the present disclosure is made from ceramic. Further, the timepiece case is provided with a mating surface which opposes a lid member when mating with said lid member. Furthermore, in the mating surface, an arithmetic mean roughness Ra obtained from a roughness curve is at most equal to 0.6 μm, and a projection peak height Rpk obtained from the roughness curve is at most equal to 0.9 μm.

Description

時計ケースWatch case
　本開示は、時計ケースに関する。 This disclosure relates to a watch case.
　腕時計に高級感を持たせるために、ムーブメント等の収容に用いられる外装部品である時計ケースをセラミックスで構成することが提案されている。 In order to give a wristwatch a high-class feeling, it has been proposed that a watch case, which is an exterior part used for housing a movement or the like, is made of ceramics.
　例えば、特許文献１には、胴及び裏蓋の一部又は全部がセラミックスあるいは人造宝石の素材からなる時計用ケースが開示されている。 For example, Patent Document 1 discloses a watch case in which a part or the whole of a case and a back cover is made of a ceramic or artificial gemstone material.
特開昭６３－２４９０８５号公報Japanese Unexamined Patent Publication No. 63-249085
　本開示の時計ケースは、セラミックスからなる。また、嵌め合わされる蓋部材に対向する嵌合面を備える。そして、該嵌合面は、粗さ曲線から求められる算術平均粗さＲａが０．６μｍ以下であるとともに、粗さ曲線から求められる突出山部高さＲｐｋが０．９μｍ以下である。 The watch case of the present disclosure is made of ceramics. Moreover, the fitting surface facing the lid member fitted together is provided. The fitting surface has an arithmetic average roughness Ra obtained from the roughness curve of 0.6 μm or less and a protruding peak height Rpk obtained from the roughness curve of 0.9 μm or less.
本開示の時計ケースの一例を示す概略図である。It is the schematic which shows an example of the timepiece case of this indication.
　腕時計の時計ケースは、蓋部材の取り付けまたは取り外し（以下、着脱と記載する。）ができる構成とされている。この蓋部材は、水や塵等が時計ケースの内部へ入らないようにする部品である。ここで、腕時計の電池を交換する際には、この蓋部材を時計ケースから取り外す必要がある。時計ケースがセラミックスからなる場合、電池を交換するために蓋部材の着脱を繰り返すと、蓋部材との嵌合において蓋部材に対向する時計ケースの嵌合面（以下、単に嵌合面と記載する場合がある。）が摩耗しやすい。そして、時計ケースにおける嵌合面が摩耗すると、蓋部材と時計ケースとの間から水や塵等が侵入しやすくなり、腕時計の防水性や防塵性が低下する。また、嵌合面が摩耗する際に発生する屑が、ムーブメント内に入り込むことで、故障の原因となる。 The watch case of the wristwatch is configured so that the lid member can be attached or detached (hereinafter referred to as “detaching”). This lid member is a component that prevents water, dust, and the like from entering the inside of the watch case. Here, when replacing the wristwatch battery, it is necessary to remove the lid member from the watch case. When the watch case is made of ceramics, when the cover member is repeatedly attached and detached to replace the battery, the fitting surface of the watch case facing the lid member in the fitting with the lid member (hereinafter simply referred to as the fitting surface). May wear out easily). And if the fitting surface in a timepiece case wears out, water, dust, etc. will penetrate | invade easily from between a cover member and a timepiece case, and the waterproofness and dustproofness of a wristwatch will fall. Moreover, the waste generated when the fitting surface wears enters the movement, causing a failure.
　本開示の時計ケースは、蓋部材の着脱を繰り返しても、嵌合面が摩耗しにくいことから、防水性や防塵性を長期間にわたって維持することができる。以下に、本開示の時計ケースについて、図１を用いて詳細に説明する。なお、図１示す時計ケース１においては、図示における下方から蓋部材が嵌め合わされるものであり、ハッチングしている面が嵌合面２である。 The watch case of the present disclosure can maintain waterproofness and dustproofness for a long period of time because the fitting surface is not easily worn even when the lid member is repeatedly attached and detached. Hereinafter, the watch case of the present disclosure will be described in detail with reference to FIG. In the watch case 1 shown in FIG. 1, the lid member is fitted from below in the drawing, and the hatched surface is the fitting surface 2.
　本開示の時計ケース１は、セラミックスからなる。ここで、セラミックスとは、酸化アルミニウム質セラミックス、酸化ジルコニウム質セラミックス、窒化珪素質セラミックスまたは炭化珪素質セラミックス等である。セラミックスの中でも、酸化ジルコニウム質セラミックスで本開示の時計ケース１を構成すれば、長期間の使用においても傷がつきにくいことから、美観を損ねにくい。 The watch case 1 of the present disclosure is made of ceramics. Here, the ceramic is aluminum oxide ceramics, zirconium oxide ceramics, silicon nitride ceramics, silicon carbide ceramics, or the like. Among the ceramics, if the watch case 1 of the present disclosure is made of zirconium oxide ceramics, it is difficult to damage even after long-term use, so that the aesthetic appearance is hardly impaired.
　ここで、酸化ジルコニウム質セラミックスとは、酸化ジルコニウムを主成分としたセラミックスであり、セラミックスを構成する全成分１００質量％のうち酸化ジルコニウムを７０質量％以上含有するものである。そして、上記主成分の含有量は、以下の方法により算出することができる。まず、Ｘ線回折装置（ＸＲＤ）を用いて時計ケース１を測定し、得られた２θ（２θは、回折角度である。）の値をＪＣＰＤＳカードで同定する。このとき、時計ケース１が酸化ジルコニウム質セラミックスで構成される場合には、酸化ジルコニウムの存在が確認される。 Here, the zirconium oxide-based ceramic is a ceramic mainly composed of zirconium oxide, and contains 70% by mass or more of zirconium oxide out of 100% by mass of all components constituting the ceramic. The content of the main component can be calculated by the following method. First, the watch case 1 is measured using an X-ray diffractometer (XRD), and the obtained 2θ (2θ is a diffraction angle) value is identified by a JCPDS card. At this time, when the watch case 1 is made of a zirconium oxide ceramic, the presence of zirconium oxide is confirmed.
　次に、ＩＣＰ（Inductively Coupled Plasma）発光分光分析装置（ＩＣＰ）を用いて、同定された成分のうちの金属成分（酸素、炭素および窒素等以外）の定量分析を行なう。そして、定量分析の結果から、ＸＲＤで同定された成分（化合物）の含有量を算出する。例えば、ＸＲＤで同定された成分が酸化ジルコニウムであれば、ＩＣＰで測定することによって得られたジルコニウム（Ｚｒ）の含有量から酸化ジルコニウム（ＺｒＯ2）に換算する。ここで換算した含有量が７０質量％以上であれば、酸化ジルコニウム質セラミックスである。なお、他のセラミックスについても同じ方法で確認できる。 Next, using an ICP (Inductively Coupled Plasma) emission spectroscopic analyzer (ICP), quantitative analysis of metal components (other than oxygen, carbon, nitrogen, etc.) among the identified components is performed. Then, the content of the component (compound) identified by XRD is calculated from the result of quantitative analysis. For example, if the component identified by XRD is zirconium oxide, the content of zirconium (Zr) obtained by measurement by ICP is converted to zirconium oxide (ZrO 2 ). If content converted here is 70 mass% or more, it is a zirconium oxide ceramic. In addition, it can confirm with the same method also about other ceramics.
　そして、本開示の時計ケース１は、嵌め合わされる蓋部材に対向する嵌合面２を備えている。そして、この嵌合面２は、粗さ曲線から求められる算術平均粗さＲａが０．６μｍ以下であるとともに、粗さ曲線から求められる突出山部高さＲｐｋが０．９μｍ以下である。 The watch case 1 of the present disclosure includes a fitting surface 2 that faces the lid member to be fitted. The fitting surface 2 has an arithmetic average roughness Ra obtained from the roughness curve of 0.6 μm or less and a protruding peak height Rpk obtained from the roughness curve of 0.9 μm or less.
　ここで、算術平均粗さＲａとは、ＪＩＳ　Ｂ　０６０１（２０１３）に規定された値のことを言う。また、突出山部高さＲｐｋとは、ＪＩＳ　Ｂ　０６７１－２（２００２）に規定されており、以下の定義による。まず、粗さ曲線の測定点の４０％を含む負荷曲線の中央部分において、負荷長さ率の差を４０％にして引いた負荷曲線の割線が、最も緩い傾斜となる直線を等価直線とする。次に、この等価直線が負荷長さ率０％と１００％との位置で縦軸と交わる２つの高さ位置の間をコア部とする。そして、粗さ曲線において、コア部の上にある突出した山部の平均高さが突出山部高さＲｐｋである。 Here, the arithmetic average roughness Ra is a value defined in JIS B 0601 (2013). The protruding peak height Rpk is defined in JIS B 0671-2 (2002) and is defined as follows. First, in the central portion of the load curve including 40% of the measurement points of the roughness curve, the straight line where the dividing line of the load curve drawn with the difference in load length ratio being 40% is the most gentle is defined as the equivalent line. . Next, a core portion is defined between two height positions where the equivalent straight line intersects the vertical axis at the load length ratios of 0% and 100%. In the roughness curve, the average height of the protruding ridge above the core is the protruding ridge height Rpk.
　そして、本開示の時計ケース１は、上記構成を満足していることで、嵌合面２の凹凸が小さいとともに、突出した山部が小さいことから、蓋部材の着脱を繰り返しても、突出した山部が摩耗しにくい。よって、本開示の時計ケース１は、蓋部材の着脱を繰り返しても、防水性や防塵性を長期間にわたって維持することができる。なお、嵌合面２において、算術平均粗さＲａが０．１μｍ以上であるとともに、突出山部高さＲｐｋが０．０６μｍ以上であるならば、少なからず山部が存在することで、蓋部材の着脱が行ないやすい。 Since the watch case 1 of the present disclosure satisfies the above-described configuration, the unevenness of the fitting surface 2 is small and the protruding peak portion is small, so that it protrudes even when the lid member is repeatedly attached and detached. Mountains are less likely to wear. Therefore, the watch case 1 of the present disclosure can maintain waterproofness and dustproofness for a long period of time even when the lid member is repeatedly attached and detached. In addition, when the arithmetic average roughness Ra is 0.1 μm or more and the protruding peak height Rpk is 0.06 μm or more on the fitting surface 2, the cover member is formed by the presence of a peak. Easy to put on and take off.
　また、本開示の時計ケース１における嵌合面２は、粗さ曲線から求められるコア部のレベル差Ｒｋが０．８μｍ以下であってもよい。ここで、コア部のレベル差Ｒｋとは、ＪＩＳ　Ｂ　０６７１－２（２００２）に規定されており、粗さ曲線において、上述したコア部の上側と下側とのレベル差を示す指標である。 Further, the fitting surface 2 in the watch case 1 of the present disclosure may have a core portion level difference Rk obtained from a roughness curve of 0.8 μm or less. Here, the level difference Rk of the core part is defined in JIS B 0671-2 (2002) and is an index indicating the level difference between the upper side and the lower side of the core part described above in the roughness curve.
　このような構成を満足するならば、本開示の時計ケース１の嵌合面２は、コア部の高さばらつきが小さいことから、蓋部材が嵌合面２のコア部に対応する箇所と接触しても、その箇所は摩耗しにくくなる。よって、蓋部材の着脱を繰り返しても、防水性や防塵性をより長く維持することができる。なお、嵌合面２において、コア部のレベル差Ｒｋが０．１１μｍ以上であるならば、優れた防水性および優れた防塵性を有しつつ、蓋部材の着脱を行ないやすい。 If such a configuration is satisfied, the fitting surface 2 of the watch case 1 of the present disclosure has a small variation in the height of the core portion, so that the lid member contacts the portion corresponding to the core portion of the fitting surface 2. Even so, the part is less likely to wear. Therefore, even if the attachment and detachment of the lid member is repeated, the waterproofness and dustproofness can be maintained longer. In addition, in the fitting surface 2, if the level difference Rk of the core part is 0.11 μm or more, the lid member can be easily attached and detached while having excellent waterproof properties and excellent dust resistance.
　また、本開示の時計ケース１における嵌合面２は、コア部のレベル差Ｒｋと突出山部高さＲｐｋとの比Ｒｐｋ／Ｒｋが０．７以下であってもよい。このような構成を満足するならば、本開示の時計ケース１の嵌合面２は、突出した山部が小さく、かつコア部の高さばらつきが小さい表面性状となることから、蓋部材の着脱を繰り返しても、防水性や防塵性をより長く維持することができる。なお、嵌合面２において、比Ｒｐｋ／Ｒｋが０．５以上であるならば、優れた防水性および優れた防塵性を有しつつ、蓋部材の着脱を行ないやすい。 Further, in the fitting surface 2 in the watch case 1 of the present disclosure, the ratio Rpk / Rk between the level difference Rk of the core part and the protruding peak part height Rpk may be 0.7 or less. If such a configuration is satisfied, the fitting surface 2 of the watch case 1 of the present disclosure has a surface property in which the protruding peak portion is small and the height variation of the core portion is small. Even if it repeats, waterproofness and dustproofness can be maintained longer. In addition, if the ratio Rpk / Rk is 0.5 or more in the fitting surface 2, the lid member can be easily attached and detached while having excellent waterproof properties and excellent dust resistance.
　また、本開示の時計ケース１における嵌合面２は、粗さ曲線から求められるスキューネスＲｓｋが負であってもよい。ここで、スキューネスＲｓｋとは、ＪＩＳ　Ｂ　０６０１（２０１３）に規定されており、粗さの平均高さを中心線とした際に、これに対する山部と谷部との比率を示す指標である。スキューネスＲｓｋが負ならば、谷部よりも山部となる領域の方が大きいことを示している。このような構成を満足するならば、蓋部材の着脱を繰り返しても、嵌合面２における山部自体が欠けにくくなることから、防水性や防塵性をより長く維持することができる。 Further, the fitting surface 2 in the watch case 1 of the present disclosure may have a negative skewness Rsk obtained from a roughness curve. Here, the skewness Rsk is defined in JIS B 0601 (2013), and is an index indicating the ratio of the peak portion to the valley portion when the average roughness height is taken as the center line. If the skewness Rsk is negative, it indicates that the region that is a peak is larger than the valley. If such a configuration is satisfied, even if the lid member is repeatedly attached and detached, the crest portion itself in the fitting surface 2 becomes difficult to be chipped, so that the waterproofness and dustproofness can be maintained for a longer time.
　また、本開示の時計ケース１における嵌合面２は、粗さ曲線から求められる平均山高さＲｐｍが０．５μｍ以下であってもよい。ここで、平均山高さＲｐｍとは、粗さ曲線から平均線の方向に基準長さだけ抜き取り、基準長さを５等分に区切った区間において、各区間に含まれる最も高い山部の平均高さから頂までの高さをＲｐｉとした際、この５つの区間におけるＲｐｉの平均値のことである。このような構成を満足するならば、本開示の時計ケース１の嵌合面２は、突出している山部が少ないことから、蓋部材の着脱を繰り返しても嵌合面２における摩耗が少ないため、防水性や防塵性をより長く維持することができる。なお、嵌合面２において、平均山高さＲｐｍが０．２μｍ以上であるならば、優れた防水性および優れた防塵性を有しつつ、蓋部材の着脱を行ないやすい。 Further, the fitting surface 2 in the watch case 1 of the present disclosure may have an average peak height Rpm determined from a roughness curve of 0.5 μm or less. Here, the average peak height Rpm is the average height of the highest peak part included in each section in the section in which only the reference length is extracted from the roughness curve in the direction of the average line and the reference length is divided into five equal parts. When the height from the top to the top is Rpi, it is the average value of Rpi in these five sections. If such a configuration is satisfied, the fitting surface 2 of the watch case 1 of the present disclosure has few protruding peaks, and therefore, the wear on the fitting surface 2 is small even when the lid member is repeatedly attached and detached. The waterproofness and dustproofness can be maintained longer. In addition, in the fitting surface 2, if the average peak height Rpm is 0.2 μm or more, it is easy to attach and detach the lid member while having excellent waterproofness and excellent dustproofness.
　また、本開示の時計ケース１における嵌合面２は、二乗平均平方根傾斜ＲΔｑが１０°以下であってもよい。ここで、二乗平均平方根傾斜ＲΔｑとは、ＪＩＳ　Ｂ　０６０１（２０１３）に規定されており、山部の傾きのなだらかさを示す指標である。このような構成を満足するならば、本開示の時計ケース１の嵌合面２における山部の傾きはなだらかとなり、蓋部材の着脱を繰り返しても、山部が摩耗しにくいことから、防水性や防塵性をより長く維持することができる。なお、嵌合面２において、二乗平均平方根傾斜ＲΔｑが３°以上であるならば、優れた防水性および優れた防塵性を有しつつ、蓋部材の着脱を行ないやすい。 Further, the fitting surface 2 in the watch case 1 of the present disclosure may have a root mean square slope RΔq of 10 ° or less. Here, the root mean square slope RΔq is defined in JIS B 0601 (2013), and is an index indicating the gentleness of the slope of the mountain. If such a configuration is satisfied, the slope of the peak portion on the fitting surface 2 of the watch case 1 of the present disclosure becomes gentle, and even if the lid member is repeatedly attached and detached, the peak portion is not easily worn. And dustproofness can be maintained longer. In addition, in the fitting surface 2, if the root mean square slope RΔq is 3 ° or more, the lid member can be easily attached and detached while having excellent waterproof properties and excellent dust resistance.
　また、本開示の時計ケース１における嵌合面２は、粗さ曲線から求められる山部頂点の平均間隔Ｓが１５μｍ以下であってもよい。ここで、山部頂点の平均間隔Ｓとは、ＪＩＳ　Ｂ　０６０１（１９９４）に規定されており、隣り合う山部の頂点同士の間隔の平均値を示す指標である。このような構成を満足するならば、本開示の時計ケース１の嵌合面２において、水や塵等が侵入しやすい山部同士の隙間が狭くなることから、防水性や防塵性を向上させることができる。なお、嵌合面２において、山部頂点の平均間隔Ｓが３μｍ以上であるならば、優れた防水性および優れた防塵性を有しつつ、蓋部材の着脱を行ないやすい。 Further, the fitting surface 2 in the watch case 1 of the present disclosure may have an average interval S between the peak portions obtained from the roughness curve of 15 μm or less. Here, the average interval S between peak portions is defined by JIS B 0601 (1994) and is an index indicating the average value of the intervals between adjacent peak portions. If such a configuration is satisfied, the gap between the ridges where water, dust and the like easily enter is narrowed on the fitting surface 2 of the watch case 1 of the present disclosure, so that waterproofness and dustproofness are improved. be able to. In addition, if the average space | interval S of a peak part is 3 micrometers or more in the fitting surface 2, it will be easy to attach or detach a cover member, having the outstanding waterproofness and the outstanding dustproof property.
　ここで、本開示の時計ケース１の嵌合面２における、算術平均粗さＲａ、スキューネスＲｓｋ、平均山高さＲｐｍ、二乗平均平方根傾斜ＲΔｑは、ＪＩＳ　Ｂ　０６０１（２０１３）に準拠して測定すればよい。また、本開示の時計ケース１の嵌合面２における、山部頂点の平均間隔Ｓは、ＪＩＳ　Ｂ　０６０１（１９９４）に準拠して測定すればよい。一方、本開示の時計ケース１の嵌合面２における、突出山部高さＲｐｋ、コア部のレベル差Ｒｋは、ＪＩＳ　Ｂ　０６７１－２（２００２）に準拠して測定すればよい。測定条件としては、例えば、測定長さを０．８ｍｍ、カットオフ値を１．０ｍｍとし、触針半径が２μｍの触針の走査速度を１ｍｍ／秒に設定すればよい。そして、嵌合面２において、少なくとも３ヵ所測定し、その平均値を求めればよい。 Here, the arithmetic average roughness Ra, skewness Rsk, average peak height Rpm, and root mean square slope RΔq in the fitting surface 2 of the watch case 1 of the present disclosure can be measured in accordance with JIS B 0601 (2013). Good. Moreover, what is necessary is just to measure the average space | interval S of the peak part in the fitting surface 2 of the timepiece case 1 of this indication based on JISB0601 (1994). On the other hand, the protruding peak height Rpk and the core level difference Rk on the fitting surface 2 of the watch case 1 of the present disclosure may be measured in accordance with JIS B 0671-2 (2002). As measurement conditions, for example, the measurement length is 0.8 mm, the cutoff value is 1.0 mm, and the scanning speed of a stylus with a stylus radius of 2 μm may be set to 1 mm / second. Then, it is only necessary to measure at least three places on the fitting surface 2 and obtain the average value.
　また、本開示の時計ケース１は、図１に示すように、嵌合面２において、溝部３を有していてもよい。この溝部３は、蓋部材に突起が存在する場合に、その突起と嵌合される部位である。このように、本開示の時計ケース１が溝部３を有し、蓋部材の突起と溝部３とが嵌合される構成であるならば、時計ケース１に蓋部材をより強固に固定することができる。 Further, the watch case 1 of the present disclosure may have a groove 3 on the fitting surface 2 as shown in FIG. This groove part 3 is a part fitted to the protrusion when the cover member has a protrusion. Thus, if the timepiece case 1 of the present disclosure has the groove portion 3 and the projection of the lid member and the groove portion 3 are fitted, the lid member can be more firmly fixed to the timepiece case 1. it can.
　また、本開示の時計ケース１は、図１に示すように、嵌合面２において、竜頭が挿入されるための孔である貫通孔４を有していてもよい。なお、竜頭とは、外部から時計の時刻修正の操作等を行なうためのものである。 Further, as shown in FIG. 1, the watch case 1 of the present disclosure may have a through hole 4 that is a hole for inserting the crown in the fitting surface 2. Note that the crown is for performing a time adjustment operation of the clock from the outside.
　以下、本開示の時計ケース１の製造方法について説明する。なお、ここでは酸化ジルコニウム質セラミックスからなる時計ケース１を例に挙げて説明する。 Hereinafter, a method for manufacturing the watch case 1 of the present disclosure will be described. Here, the case 1 made of a zirconium oxide ceramic will be described as an example.
　まず、主原料の酸化ジルコニウム（ＺｒＯ2）粉末を溶媒およびボールとともにミルに入れて、所定の粒度となるまで粉砕し、スラリーを作製する。次に、得られたスリラーにバインダを添加した後、スプレードライヤーを用いて、噴霧乾燥を行なうことで顆粒を得る。 First, zirconium oxide (ZrO 2 ) powder as a main raw material is put in a mill together with a solvent and a ball and pulverized to a predetermined particle size to produce a slurry. Next, after adding a binder to the obtained thriller, granules are obtained by spray drying using a spray dryer.
　次に、この顆粒と熱可塑性樹脂とワックス等とをニーダに投入して加熱しながら混練して坏土を得る。そして、得られた坏土をペレタイザーに投入することにより、インジェクション成形（射出成形）用の原料となるペレットを得る。次に、得られたペレットをインジェクション成形機（射出成形機）に投入して射出成形することにより、時計ケース形状の成形体を得る。 Next, the granule, thermoplastic resin, wax and the like are put into a kneader and kneaded while heating to obtain a clay. And the pellet used as the raw material for injection molding (injection molding) is obtained by throwing the obtained clay into a pelletizer. Next, the obtained pellets are put into an injection molding machine (injection molding machine) and injection molded to obtain a watch case-shaped molded body.
　このように、時計ケース形状の成形体を得るためには、一般的な射出成形法に基づいて、時計ケース形状が得られる成形型を作製し、これをインジェクション成形機に設置して射出成形すればよい。ここで、この成形型の内面の表面性状が、成形体の表面に転写される。よって、算術平均粗さＲａが０．６μｍ以下であり、突出山部高さＲｐｋが０．９μｍ以下である嵌合面２を得るには、焼成後のバレル研磨等の表面処理による研磨量を考量した表面性状を内面に有する成形型を使用し、成形体を作製すればよい。なお、嵌合面２において、コア部のレベル差Ｒｋを０．８μｍ以下としたり、Ｒｐｋ／Ｒｋの値を０．７以下としたり、スキューネスＲｓｋを負としたり、平均山高さＲｐｍを０．５μｍ以下としたり、二乗平均平方根傾斜ＲΔｑを１０°以下としたり、山部頂点の平均間隔Ｓを１５μｍ以下としたりする場合も同様である。 As described above, in order to obtain a watch case-shaped molded body, a molding die capable of obtaining a watch case shape is prepared based on a general injection molding method, and this is placed in an injection molding machine and injection molded. That's fine. Here, the surface property of the inner surface of the mold is transferred to the surface of the molded body. Therefore, in order to obtain the fitting surface 2 having an arithmetic average roughness Ra of 0.6 μm or less and a protruding ridge height Rpk of 0.9 μm or less, a polishing amount by surface treatment such as barrel polishing after firing is set. What is necessary is just to produce a molded object using the shaping | molding die which has the surface property weighed on the inner surface. In the fitting surface 2, the core level difference Rk is 0.8 μm or less, the Rpk / Rk value is 0.7 or less, the skewness Rsk is negative, and the average peak height Rpm is 0.5 μm. The same applies to the following cases, when the root mean square slope RΔq is set to 10 ° or less, or the average interval S between the peak portions is set to 15 μm or less.
　次に、得られた時計ケース形状の成形体を、例えば、酸化ジルコニウムが主原料である場合には、大気雰囲気中において最高温度１３５０℃以上１５５０℃以下で焼成することで、焼結体を得る。そして、得られた焼結体をバレル研磨することにより、本開示の時計ケース１を得る。なお、焼成条件は、製品の形状や大きさにより変化するため、必要に応じて調整すればよい。 Next, for example, when zirconium oxide is the main raw material, the obtained watch case-shaped molded body is fired at a maximum temperature of 1350 ° C. or higher and 1550 ° C. or lower in an air atmosphere to obtain a sintered body. . And the timepiece case 1 of this indication is obtained by carrying out barrel polishing of the obtained sintered compact. In addition, since baking conditions change with the shape and magnitude | size of a product, what is necessary is just to adjust as needed.
　以下、本開示の実施例を具体的に説明するが、本開示はこれらの実施例に限定されるものではない。 Hereinafter, examples of the present disclosure will be specifically described, but the present disclosure is not limited to these examples.
　嵌合面において、算術平均粗さＲａ、突出山部高さＲｐｋおよびコア部のレベル差Ｒｋが異なる試料（時計ケース）を作製し、蓋部材の着脱試験を行なった。 On the fitting surface, samples (watch cases) having different arithmetic average roughness Ra, protruding peak height Rpk, and core level difference Rk were prepared, and a lid member attachment / detachment test was performed.
　まず、酸化ジルコニウム（ＺｒＯ2）が９４．８質量％、安定化剤である酸化イットリウム（Ｙ2Ｏ3）が５．２質量％となるように秤量し、混合することで原料粉末を得た。そして、この原料粉末１００質量％に対して、顔料成分としての酸化クロム（Ｃｒ2Ｏ3）、酸化鉄（Ｆｅ2Ｏ3）および酸化コバルト（Ｃｏ3Ｏ4）を合計で４質量％添加した。さらに、これらに水を加えてボールミルで粉砕・混合してスラリーを得た。 First, raw material powder was obtained by weighing and mixing zirconium oxide (ZrO 2 ) at 94.8 mass% and stabilizer yttrium oxide (Y 2 O 3 ) at 5.2 mass%. . Then, with respect to the raw material powder 100 wt%, chromium oxide as a pigment component (Cr 2 O 3), and the iron oxide (Fe 2 O 3) and cobalt oxide (Co 3 O 4) was added 4 wt% in total . Further, water was added to these and pulverized and mixed with a ball mill to obtain a slurry.
　次に、このスラリーにバインダを添加した後、スプレードライヤーを用いて、噴霧乾燥を行なうことで顆粒を得た。そして、得られた顆粒に熱可塑性樹脂とワックスとを加えて、ニーダに投入して加熱しながら混練して坏土を得た。次に、得られた坏土をペレタイザーに投入してインジェクション成形用の原料となるペレットを得た。そして、このペレットをインジェクション成形機に投入し、時計ケース形状の成形体を得た。 Next, after adding a binder to this slurry, granules were obtained by spray drying using a spray dryer. Then, a thermoplastic resin and a wax were added to the obtained granules, and the mixture was put into a kneader and kneaded while heating to obtain a clay. Next, the obtained kneaded material was put into a pelletizer to obtain pellets as a raw material for injection molding. Then, the pellets were put into an injection molding machine to obtain a watch case-shaped molded body.
　ここで、インジェクション成形機に設置する成形型の内面の表面性状は、焼成後のバレル研磨による研磨量を考量して、各試料の嵌合面が表１に示す算術平均粗さＲａ、突出山部高さＲｐｋおよびコア部のレベル差Ｒｋとなるようにした。 Here, the surface property of the inner surface of the molding die installed in the injection molding machine is determined by considering the amount of polishing by barrel polishing after firing, and the mating surface of each sample has the arithmetic average roughness Ra, protruding peak shown in Table 1. The height Rpk and the core level difference Rk were set.
　次に、この時計ケース形状の成形体を、大気雰囲気中において最高温度１５００℃で焼成を行ない、時計ケース形状の焼結体を得た。そして、得られた焼結体をバレル研磨することによって各試料を得た。 Next, this watch case-shaped compact was fired at a maximum temperature of 1500 ° C. in an air atmosphere to obtain a watch case-shaped sintered body. And each sample was obtained by carrying out barrel polishing of the obtained sintered compact.
　そして、得られた各試料について、接触型の表面粗さ計を用い、ＪＩＳ　Ｂ　０６０１（２００１）およびＪＩＳ　Ｂ　０６７１－２（２００２）に基づき、嵌合面における、算術平均粗さＲａ、突出山部高さＲｐｋ、コア部のレベル差Ｒｋの測定を行なった。測定条件としては、測定長さを０．８ｍｍ、カットオフ値を１．０ｍｍとし、触針半径が２μｍの触針の走査速度を１ｍｍ／秒に設定し、嵌合面において３ヵ所測定し、その平均値を算出した。 For each of the obtained samples, using a contact-type surface roughness meter, the arithmetic average roughness Ra, protruding peak on the mating surface based on JIS B 0601 (2001) and JIS B 0671-2 (2002) The part height Rpk and the core level difference Rk were measured. As measurement conditions, the measurement length is 0.8 mm, the cutoff value is 1.0 mm, the scanning speed of the stylus with a stylus radius of 2 μm is set to 1 mm / second, and measurement is performed at three locations on the mating surface. The average value was calculated.
　次に、各試料を用いて、蓋部材の着脱試験を行なった。まず、蓋部材としては、各試料の嵌合面に嵌合するステンレス製の蓋部材を用いた。次に、市販の蓋部材閉め機を用いて、各試料に対して、蓋部材の着脱を１０回行なった。このとき、プッシュプルゲージを用いて、１回目に蓋部材を取り付ける際に必要とした荷重σ０と、１０回目に蓋部材を取り付ける際に必要とした荷重σ１とを測定した。そして、この荷重σ０と荷重σ１とから、必要荷重の低下率Δσ（％）＝（σ０－σ１）／σ０×１００を計算した。そして、必要荷重の低下率Δσが低いものから順に、各試料に順位を付けた。つまり、最も必要荷重の低下率Δσが低い試料を１位とし、最も必要荷重の低下率Δσが高い試料を最下位とした。そして、必要荷重の低下率Δσの順位が高い程、蓋部材の着脱を繰り返しても、嵌合面が摩耗しておらず、嵌合面と蓋部材との密着性を維持できていることを示している。 Next, a detachment test of the lid member was performed using each sample. First, as the lid member, a stainless steel lid member fitted to the fitting surface of each sample was used. Next, the lid member was attached to and detached from each sample 10 times using a commercially available lid member closing machine. At this time, using a push-pull gauge, a load σ0 required for attaching the lid member for the first time and a load σ1 required for attaching the lid member for the 10th time were measured. From the load σ0 and the load σ1, the required load reduction rate Δσ (%) = (σ0−σ1) / σ0 × 100 was calculated. Then, the samples were ranked in order from the lowest required load reduction rate Δσ. That is, the sample with the lowest necessary load reduction rate Δσ was ranked first, and the sample with the highest necessary load reduction rate Δσ was ranked lowest. The higher the required load reduction rate Δσ is, the more the fitting surface is not worn and the adhesion between the fitting surface and the lid member can be maintained even when the lid member is repeatedly attached and detached. Show.
　結果を表１に示す。 The results are shown in Table 1.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　表１に示すように、試料Ｎｏ．３～６の必要荷重の低下率Δσの順位が高かった。この結果から、嵌合面において、算術平均粗さＲａが０．６μｍ以下であり、突出山部高さＲｐｋが０．９μｍ以下であれば、蓋部材の着脱を繰り返しても、防水性や防塵性を長く維持できることが分かった。 As shown in Table 1, sample no. The rank of the required load reduction rate Δσ of 3 to 6 was high. From this result, when the arithmetic average roughness Ra is 0.6 μm or less and the protruding ridge height Rpk is 0.9 μm or less on the fitting surface, even if the lid member is repeatedly attached and detached, waterproofness and dustproof It was found that sex can be maintained for a long time.
　また、試料Ｎｏ．４～６は、試料Ｎｏ．３に比べて必要荷重の低下率Δσの順位が高かった。この結果から、嵌合面において、コア部のレベル差Ｒｋが０．８μｍ以下であれば、防水性や防塵性をより長く維持できることが分かった。 Sample No. 4 to 6 are sample Nos. Compared with 3, the required load reduction rate Δσ was higher. From this result, it was found that if the level difference Rk of the core portion is 0.8 μm or less on the fitting surface, the waterproofness and dustproofness can be maintained for a longer time.
　さらに、試料Ｎｏ．５および６は、試料Ｎｏ．４に比べて必要荷重の低下率Δσの順位が高かった。この結果から、嵌合面において、コア部のレベル差Ｒｋと突出山部高さＲｐｋとの比Ｒｐｋ／Ｒｋが０．７以下であれば、防水性や防塵性をさらに長く維持できることが分かった。 Furthermore, sample no. Samples Nos. 5 and 6 are sample Nos. Compared to 4, the rank of the required load reduction rate Δσ was higher. From this result, it was found that if the ratio Rpk / Rk between the core level difference Rk and the protruding peak height Rpk is 0.7 or less on the fitting surface, the waterproofness and dustproofness can be maintained longer. .
　次に、嵌合面において、スキューネスＲｓｋの正負が異なる試料を作製し、蓋部材の着脱試験を行なった。 Next, samples with different skewness Rsk on the mating surface were prepared, and a lid member attachment / detachment test was performed.
　なお、作製方法としては、インジェクション成形機に設置する成形型の内面の表面性状を、焼成後のバレル研磨による研磨量を考量して、各試料の嵌合面が表２に示すスキューネスＲｓｋとなるように変更したこと以外は実施例１の試料Ｎо．６の作製方法と同様とした。なお、試料Ｎｏ．７は、実施例１の試料Ｎｏ．６と同じである。 As a manufacturing method, the surface properties of the inner surface of the molding die installed in the injection molding machine are taken into account the amount of polishing by barrel polishing after firing, and the fitting surface of each sample becomes the skewness Rsk shown in Table 2. Except that the sample was changed as described above, the sample N o. 6 was the same as the manufacturing method. Sample No. 7 shows the sample No. of Example 1. Same as 6.
　そして、得られた各試料について、嵌合面において、スキューネスＲｓｋを測定したが、測定条件については実施例１と同様とした。また、蓋部材の着脱試験を、実施例１と同じ方法で行なった。 For each sample obtained, the skewness Rsk was measured on the mating surface, and the measurement conditions were the same as in Example 1. The lid member attachment / detachment test was performed in the same manner as in Example 1.
　結果を表２に示す。なお、必要荷重の低下率Δσの順位付けは、表２に示す試料のみを比較して付けている。 The results are shown in Table 2. The ranking of the required load reduction rate Δσ is made by comparing only the samples shown in Table 2.
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
　表２に示すように、試料Ｎｏ．７に比べて試料Ｎｏ．８の必要荷重の低下率Δσは低かった。この結果から、スキューネスＲｓｋが負であれば、防水性や防塵性をさらに長く維持できることが分かった。 As shown in Table 2, sample No. Compared to sample No. 7, sample no. The required load decrease rate Δσ of 8 was low. From this result, it was found that if the skewness Rsk is negative, the waterproofness and dustproofness can be maintained for a longer time.
　次に、嵌合面において、平均山高さＲｐｍが異なる試料を作製し、蓋部材の着脱試験を行なった。 Next, samples having different average peak heights Rpm were prepared on the fitting surface, and a cover member attachment / detachment test was performed.
　なお、作製方法としては、インジェクション成形機に設置する成形型の内面の表面性状を、焼成後のバレル研磨による研磨量を考量して、各試料の嵌合面が表３に示す平均山高さＲｐｍとなるように変更したこと以外は実施例２の試料Ｎо．８の作製方法と同様とした。なお、試料Ｎｏ．９は、実施例２の試料Ｎｏ．８と同じである。 As the production method, the surface properties of the inner surface of the molding die installed in the injection molding machine were determined by considering the amount of polishing by barrel polishing after firing, and the average crest height Rpm shown in Table 3 for the fitting surface of each sample is shown in Table 3. Except that the sample was changed so that 8 was the same as the manufacturing method. Sample No. 9 is the sample No. of Example 2. Same as 8.
　そして、得られた各試料について、嵌合面において、平均山高さＲｐｍを測定したが、測定条件については実施例１と同様とした。また、蓋部材の着脱試験を、実施例１と同じ方法で行なった。 And about each obtained sample, although the average peak height Rpm was measured in the fitting surface, it was the same as that of Example 1 about the measurement conditions. The lid member attachment / detachment test was performed in the same manner as in Example 1.
　結果を表３に示す。なお、必要荷重の低下率Δσの順位付けは、表３に示す試料のみを比較して付けている。 The results are shown in Table 3. The ranking of the required load reduction rate Δσ is made by comparing only the samples shown in Table 3.
Figure JPOXMLDOC01-appb-T000003
Figure JPOXMLDOC01-appb-T000003
　表３に示すように、試料Ｎｏ．９に比べて試料Ｎｏ．１０および１１の必要荷重の低下率Δσは低かった。この結果から、平均山高さＲｐｍが０．５μｍ以下であれば、防水性や防塵性をさらに長く維持できることが分かった。 As shown in Table 3, sample No. Compared to sample No. 9, sample no. The required load reduction rate Δσ of 10 and 11 was low. From this result, it was found that if the average peak height Rpm is 0.5 μm or less, the waterproofness and dustproofness can be maintained longer.
　次に、嵌合面において、二乗平均平方根傾斜ＲΔｑが異なる試料を作製し、蓋部材の着脱試験を行なった。 Next, samples having different root mean square slopes RΔq on the fitting surface were prepared, and a lid member attachment / detachment test was performed.
　なお、作製方法としては、インジェクション成形機に設置する成形型の内面の表面性状を、焼成後のバレル研磨による研磨量を考量して、各試料の嵌合面が表４に示す二乗平均平方根傾斜ＲΔｑとなるように変更したこと以外は実施例３の試料Ｎо．１１の作製方法と同様とした。なお、試料Ｎｏ．１５は、実施例３の試料Ｎｏ．１１と同じである。 In addition, as a manufacturing method, the surface property of the inner surface of the molding die installed in the injection molding machine is taken into consideration, the amount of polishing by barrel polishing after firing, and the fitting surface of each sample has a root mean square slope shown in Table 4 Except for the change to be RΔq, the sample N o. 11 was the same as the manufacturing method. Sample No. 15 is the sample No. of Example 3. 11 is the same.
　そして、得られた各試料について、嵌合面において、二乗平均平方根傾斜ＲΔｑを測定したが、測定条件については実施例１と同様とした。また、蓋部材の着脱試験を、実施例１と同じ方法で行なった。 And about each obtained sample, the root mean square inclination R (DELTA) q was measured in the fitting surface, About the measurement conditions, it was made to be the same as that of Example 1. FIG. The lid member attachment / detachment test was performed in the same manner as in Example 1.
　結果を表４に示す。なお、必要荷重の低下率Δσの順位付けは、表４に示す試料のみを比較して付けている。 The results are shown in Table 4. The ranking of the required load reduction rate Δσ is made by comparing only the samples shown in Table 4.
Figure JPOXMLDOC01-appb-T000004
Figure JPOXMLDOC01-appb-T000004
　表４に示すように、試料Ｎｏ．１５に比べて試料Ｎｏ．１２～１４の必要荷重の低下率Δσは低かった。この結果から、二乗平均平方根傾斜ＲΔｑが１０°以下であれば、防水性や防塵性をさらに長く維持できることが分かった。 As shown in Table 4, sample no. Sample No. The required load reduction rate Δσ of 12 to 14 was low. From this result, it was found that if the root mean square slope RΔq is 10 ° or less, waterproofness and dustproofness can be maintained longer.
　次に、嵌合面において、山部頂点の平均間隔Ｓが異なる試料を作製し、蓋部材の着脱試験を行なった。 Next, on the fitting surface, samples having different average intervals S at the peak portions were produced, and a lid member attachment / detachment test was performed.
　なお、作製方法としては、インジェクション成形機に設置する成形型の内面の表面性状を、焼成後のバレル研磨による研磨量を考量して、各試料の嵌合面が表５に示す山部頂点の平均間隔Ｓとなるように変更したこと以外は実施例４の試料Ｎо．１２の作製方法と同様とした。なお、試料Ｎｏ．１９は、実施例４の試料Ｎｏ．１２と同じである。 In addition, as a manufacturing method, the surface property of the inner surface of the molding die installed in the injection molding machine is considered, and the amount of polishing by barrel polishing after firing is taken into consideration. Except that the average interval S was changed, the sample N. 12 was the same as the manufacturing method. Sample No. 19 is the sample No. of Example 4. 12 is the same.
　そして、得られた各試料について、ＪＩＳ　Ｂ　０６０１（１９９４）に基づき、嵌合面において、山部頂点の平均間隔Ｓを測定したが、測定条件については実施例１と同様とした。また、蓋部材の着脱試験を、実施例１と同じ方法で行なった。 And about each obtained sample, based on JISB0601 (1994), the average space | interval S of the peak part was measured in the fitting surface, but it was the same as that of Example 1 about the measurement conditions. The lid member attachment / detachment test was performed in the same manner as in Example 1.
　結果を表５に示す。なお、必要荷重の低下率Δσの順位付けは、表５に示す試料のみを比較して付けている。 The results are shown in Table 5. The ranking of the required load reduction rate Δσ is made by comparing only the samples shown in Table 5.
Figure JPOXMLDOC01-appb-T000005
Figure JPOXMLDOC01-appb-T000005
　表５に示すように、試料Ｎｏ．１９に比べて試料Ｎｏ．１６～１８の必要荷重の低下率Δσは低かった。この結果から、山部頂点の平均間隔Ｓが１５μｍ以下であれば、防水性や防塵性をさらに長く維持できることが分かった。 As shown in Table 5, sample no. Compared to sample No. 19, sample no. The required load reduction rate Δσ of 16 to 18 was low. From this result, it was found that if the average interval S between the peak portions is 15 μm or less, the waterproofness and dustproofness can be maintained longer.
　１：時計ケース
　２：嵌合面
　３：溝部
　４：貫通孔 1: Watch case 2: Fitting surface 3: Groove part 4: Through hole

Claims (8)

  1. 　セラミックスからなり、
    嵌め合わされる蓋部材に対向する嵌合面を備え、
    該嵌合面は、粗さ曲線から求められる算術平均粗さＲａが０．６μｍ以下であるとともに、粗さ曲線から求められる突出山部高さＲｐｋが０．９μｍ以下である時計ケース。     Made of ceramics,
    A fitting surface facing the fitted lid member;
    The fitting surface is a watch case in which an arithmetic average roughness Ra obtained from a roughness curve is 0.6 μm or less and a protruding peak height Rpk obtained from the roughness curve is 0.9 μm or less.
  2. 　前記嵌合面は、粗さ曲線から求められるコア部のレベル差Ｒｋが０．８μｍ以下である請求項１に記載の時計ケース。 The watch case according to claim 1, wherein the fitting surface has a core portion level difference Rk determined from a roughness curve of 0.8 µm or less.
  3. 　前記嵌合面は、粗さ曲線から求められるコア部のレベル差Ｒｋと前記突出山部高さＲｐｋとの比Ｒｐｋ／Ｒｋが０．７以下である請求項１または請求項２に記載の時計ケース。 3. The timepiece according to claim 1, wherein the fitting surface has a ratio Rpk / Rk between a level difference Rk of the core portion obtained from a roughness curve and the protruding peak height Rpk of 0.7 or less. Case.
  4. 　前記嵌合面は、粗さ曲線から求められるスキューネスＲｓｋが負である請求項１乃至請求項３のいずれかに記載の時計ケース。 The timepiece case according to any one of claims 1 to 3, wherein the fitting surface has a negative skewness Rsk obtained from a roughness curve.
  5. 　前記嵌合面は、粗さ曲線から求められる平均山高さＲｐｍが０．５μｍ以下である請求項１乃至請求項４のいずれかに記載の時計ケース。 The watch case according to any one of claims 1 to 4, wherein the fitting surface has an average peak height Rpm determined from a roughness curve of 0.5 µm or less.
  6. 　前記嵌合面は、二乗平均平方根傾斜ＲΔｑが１０°以下である請求項１乃至請求項５のいずれかに記載の時計ケース。 6. The timepiece case according to claim 1, wherein the fitting surface has a root mean square slope RΔq of 10 ° or less.
  7. 　前記嵌合面は、粗さ曲線から求められる山部頂点の平均間隔Ｓが１５μｍ以下である請求項１乃至請求項６のいずれかに記載の時計ケース。 The watch case according to any one of claims 1 to 6, wherein the fitting surface has an average interval S of peak portions obtained from a roughness curve of 15 µm or less.
  8. 　前記セラミックスは、酸化ジルコニウム質セラミックスである請求項１乃至請求項７のいずれかに記載の時計ケース。 The watch case according to any one of claims 1 to 7, wherein the ceramic is a zirconium oxide ceramic.
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JPWO2018101332A1 (en) 2018-12-06
EP3550383A4 (en) 2020-07-08
JP6419391B2 (en) 2018-11-07
EP3550383A1 (en) 2019-10-09
CN109997085A (en) 2019-07-09
CN109997085B (en) 2021-12-24

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