JP4874017B2 - Gas stopper and gas stopper manufacturing method - Google Patents
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この発明はガス栓、特に、鋳鉄鋳物製のガス栓本体及びせんの摺動面に表面処理が施されてなるガス栓及びその製造方法に関するものである。 The present invention relates to a gas stopper, in particular, a gas stopper body made of cast iron and a gas stopper in which a surface of a sliding surface of a shell is subjected to surface treatment, and a method for manufacturing the same.
一般に、ガス栓は、図４に示すように、ガス流路(1a)に連通するせん収容部(10)が形成されているガス栓本体(1)と、前記ガス流路(1a)に挿通するガス通過孔(20)が形成され且つ前記せん収容部(10)内に、まわり対偶状態に収容されるせん(2)と、せん(2)を回動操作する操作ハンドル(3)とから構成されている。
尚、せん収容部(10)は、図面における上方開放端に向かって拡径する形状に形成されており、せん(2)は、せん収容部(10)にちょうど嵌まり合う逆円錐台形状に形成されており、せん収容部(10)の内周面及びせん(2)の外周面は、それぞれ、操作ハンドル(3)の操作によってせん(2)が回動する際に、相互に擦れ合う本体摺動面(11)及びせん摺動面(21)を構成している。
In general, as shown in FIG. 4, the gas stopper is inserted into the gas stopper main body (1) in which a thread accommodating portion (10) communicating with the gas passage (1a) is formed, and the gas passage (1a). A gas passage hole (20) is formed, and the thread accommodating portion (10) includes a thread (2) that is housed in an even pair state, and an operation handle (3) that rotates the thread (2). It is configured.
The thread accommodating portion (10) is formed in a shape that expands toward the upper open end in the drawing, and the thread (2) has an inverted truncated cone shape that just fits into the thread accommodating portion (10). The main body that is formed and the inner peripheral surface of the thread accommodating portion (10) and the outer peripheral surface of the thread (2) rub against each other when the thread (2) is rotated by the operation of the operation handle (3). It constitutes a sliding surface (11) and a sliding surface (21).
ガス栓本体(1)、せん(2)及び操作ハンドル(3)が鋳鉄製であるガス栓の場合、これらガス栓本体(1)、せん(2)、操作ハンドル(3)には、防錆のため、各々の表面にはめっき処理が施されて、めっき被膜が形成されている。 When the gas stopper body (1), thread (2), and operation handle (3) are made of cast iron, the gas stopper body (1), thread (2), and operation handle (3) are rustproof. Therefore, each surface is plated to form a plating film.
従来のガス栓の本体摺動面(11)は、ガス栓本体(1)の全体にめっき被膜を施した後、所定の精度を得るために機械加工によって仕上げていたため、本体摺動面(11)に形成されためっき被膜は機械加工時に削り取られ、素地が露出していた。 Since the main sliding surface (11) of the conventional gas stopper is finished by machining to obtain a predetermined accuracy after the plating film is applied to the entire gas stopper main body (1), the main body sliding surface (11 The plating film formed on was removed during machining and the substrate was exposed.
ガスメータ用のガス栓のように屋外に設置されるガス栓では、雨や雪、場所によっては潮風によって塩分を含んだ水が、操作ハンドル(3)とガス栓本体(1)の上端開放部との隙間から、ガス栓本体(1)内に浸入することがあり、素地が露出している本体摺動面(11)に錆びを生じさせてしまい、せん(2)がせん収容部(10)内に固着し、ガス栓の開閉操作ができなくなるといった問題がある。 In gas plugs installed outdoors, such as gas meter gas plugs, water that contains salt due to rain, snow, or sea breeze depending on the location, can cause the operation handle (3) and the upper opening of the gas plug body (1) to open. May enter the gas plug body (1) from the gap between them, causing rust on the sliding surface (11) of the body where the substrate is exposed, and the thread (2) becomes the thread accommodating part (10). There is a problem that the gas stopper is stuck inside and cannot be opened and closed.
そこで、実公昭６０−５２９号公報（特許文献１）や特開平４−３４１６６７号公報（特許文献２）には、本体摺動面(11)にも、防錆及び潤滑性を得るためのめっき処理を行うことが提案されている。 Therefore, in Japanese Utility Model Publication No. 60-529 (Patent Document 1) and Japanese Patent Application Laid-Open No. 4-341667 (Patent Document 2), plating for obtaining rust prevention and lubricity on the main body sliding surface (11) is also described. It has been proposed to do the processing.
めっき処理としては、溶融亜鉛のなかに浸漬させる溶融亜鉛めっきや、金属電気めっき等があるが、実公昭６０−５２９号公報に開示のものでは、金属の電気めっき処理で形成されためっき被膜では、被めっき部の形状の変化により、被めっき面における通電量が変化するから膜厚が不均一になり、このため、摺動面に透間が生じ、気密性が大幅に低下したり、ガス栓本体(1)とせん(2)との嵌め合わせが得られないといった不都合が生じることを問題とし、これを解決する手段として、本体摺動面(11)とせん摺動面(21)の一方又は両方に、粒状減摩材とニッケルとの複合めっき被膜を無電解めっきによって形成することが開示されている。
又、特開平４−３４１６６７号公報にも、本体摺動面(11)とせん摺動面(21)に複合めっきによる被膜を形成することが開示されている。
Japanese Patent Laid-Open No. 4-341667 also discloses forming a coating film by composite plating on the main body sliding surface (11) and the spiral sliding surface (21).
しかしながら、鉄鋳物の表面に複合めっきを行うには、複合めっき被膜の膜厚を厚くする必要があるので、上述した特許文献２に開示されているように、下地めっき被膜を形成したり、複合めっき被膜自体をかなり厚く形成したりしなければならない。よって、複合めっきは、電気めっきに比べてコストが高くつくという問題がある。
However, in order to perform composite plating on the surface of an iron casting, it is necessary to increase the film thickness of the composite plating film. Therefore, as disclosed in
又、従来のガス栓本体(1)では、上述したように、全体にめっき処理を施した後に、本体摺動面(11)は機械加工により仕上げられるから、本体摺動面(11)に形成されためっき被膜は削り取られて、本体摺動面に鋳物の素地が露出してしまうと、本体摺動面が多孔質面となり、潤滑用及び気密用に塗布されるグリスのオイル成分が鋳物素材の内部に吸収されてしまう不都合がある。このような場合、本体摺動面(11)のグリスはオイル成分が抜けた状態となるため、潤滑性が失われ、せんの回動操作力が大きくなり、又、気密性が劣化するという問題がある。そのため、本体摺動面(11)のみにめっき処理を行おうとすると、本体摺動面(11)以外の部分にマスキングをしなければならず、マスキング部材の取り付けや取り外しに加えて、マスキング境界部分の処理等が必要となり、本体摺動面(11)へのめっき処理の作業性が悪く、コストが高いという問題がある。 Also, in the conventional gas plug main body (1), as described above, after the entire body is plated, the main body sliding surface (11) is finished by machining, so it is formed on the main body sliding surface (11). When the plated coating is scraped off and the casting base is exposed on the sliding surface of the main body, the sliding surface of the main body becomes a porous surface, and the oil component of the grease applied for lubrication and airtightness is the casting material. There is an inconvenience of being absorbed inside In such a case, the grease on the sliding surface of the main body (11) is in a state where the oil component has been removed, so that the lubricity is lost, the rotational operation force of the screw increases, and the airtightness deteriorates. There is. For this reason, if plating is performed only on the sliding surface (11) of the main body, masking must be performed on the portions other than the sliding surface (11) of the main body, and in addition to the attachment and removal of the masking member, the masking boundary portion There is a problem that the workability of the plating treatment on the sliding surface (11) is poor and the cost is high.
さらに、ガス栓本体(1)とせん(2)とに、同じ材質によるめっき被膜を形成した場合、本体摺動面(11)とせん摺動面(21)が同じ材質、同じ硬度となるため、両者間にカジリツキが発生し、せん(2)が円滑に回転しにくくなるといった不都合がある。 Furthermore, if the same coating material is formed on the gas plug body (1) and thread (2), the body sliding surface (11) and thread sliding surface (21) will have the same material and the same hardness. There is a disadvantage that galling occurs between the two and the screw (2) is difficult to rotate smoothly.
本発明は、『ガス流路に連通するせん収容部を具備するガス栓本体と、前記せん収容部内にまわり対偶状態に収容されるせんとからなり、前記ガス流路の開閉は、前記せんの外周面であるせん摺動面を、前記せん収容部の内周面である本体摺動面に圧接させながら前記せんを回動させることにより行われるガス栓』において、前記本体摺動面及び前記せん摺動面の各々に、防錆効果があり、両者間の気密性、潤滑性を確保することのできる表面処理被膜を、安価で且つ容易に形成できるようにすることを課題とする。 The present invention consists of a gas plug body having a thread accommodating portion communicating with the gas flow path, and a thread that is accommodated in a paired state around the thread accommodating section. In the gas stopper formed by rotating the thread while pressing the sliding surface that is the outer peripheral surface against the main body sliding surface that is the inner peripheral surface of the thread housing portion, the main body sliding surface and the It is an object of the present invention to make it possible to form easily and inexpensively a surface treatment film on each of the sliding surfaces that has a rust-proofing effect and can ensure airtightness and lubricity between the two.
（１）請求項１に係る発明のガス栓は、『前記ガス栓本体及び前記せんは共に鋳鉄製とし、
前記ガス栓本体は、機械加工により、所定の形状、寸法及び精度に全体が仕上げられた後に施されるめっき処理と化成被膜処理によって全体にめっき被膜と化成被膜とからなる表面処理被膜が形成されると共に、前記表面処理被膜が形成された前記本体摺動面にローラバニッシング加工が施されてなるものとし、
前記せんは、機械加工により所定の形状、寸法及び精度に仕上げられた後の前記せん摺動面に、前記本体摺動面に形成された表面処理被膜とは異なる材質及び硬度の樹脂、金属、又は、その複合材料による被膜が形成され、
前記めっき処理は電気亜鉛めっき処理とすると共に、前記化成被膜処理は三価クロムによるクロメート被膜処理とし、
前記せん摺動面に設ける被膜は、リン酸マンガン系被膜と、さらにその表面に形成されるスズ被膜とからなること』を特徴とするものである。
鋳鉄を鋳造することによりガス栓本体及びせんを製造する。これら鋳鉄製のガス栓本体及びせんの各摺動面を含む内外表面全体を、機械加工により所定の形状・寸法・精度に仕上げる。尚、本体摺動面及びせん摺動面への機械加工は、切削加工の他、ローラバニッシング加工を加えても良い。
(1) The gas stopper of the invention according to claim 1 is: "The gas stopper body and the screw are both made of cast iron,
The gas plug main body is formed with a surface treatment film consisting of a plating film and a chemical conversion film by a plating process and a chemical conversion film process that are performed after the whole is finished to a predetermined shape, size and accuracy by machining. And roller burnishing processing is performed on the sliding surface of the main body on which the surface treatment film is formed,
The thread is a resin, metal having a material and hardness different from the surface treatment film formed on the sliding surface of the main body on the thread sliding surface after being finished to a predetermined shape, size and accuracy by machining. Or a film of the composite material is formed ,
The plating treatment is an electrogalvanizing treatment, and the chemical conversion coating treatment is a chromate coating treatment with trivalent chromium,
The coating provided on the sliding surface comprises a manganese phosphate-based coating and a tin coating formed on the surface thereof ”.
The gas stopper body and the shell are manufactured by casting cast iron. The entire inner and outer surfaces, including the sliding surfaces of the cast iron gas plug body and the rod, are finished to a predetermined shape, size, and accuracy by machining. In addition, the machining of the main body sliding surface and the thread sliding surface may include a roller burnishing process in addition to the cutting process.
そして、前記機械加工後の前記ガス栓本体の内外表面全体にめっき処理を施してめっき被膜を形成すると共に、その上から、化成被膜処理を施して化成被膜を形成する。これにより、本体摺動面を含むガス栓本体全体に、めっき被膜と化成被膜とからなる表面処理被膜が形成される。そして、前記表面処理被膜が形成された本体摺動面にローラバニッシング加工が施されてガス栓本体が完成する。本体摺動面にローラバニッシング加工を施すことによって、切削加工や表面処理被膜の膜厚の差による表面の凹凸が押しつぶされて平滑な摺動面を得ることができる。 Then, the entire inner and outer surfaces of the gas plug main body after the machining are plated to form a plating film, and a chemical coating film is formed thereon to form a chemical conversion film. Thereby, the surface treatment film which consists of a plating film and a chemical conversion film is formed in the whole gas stopper main body including a main body sliding surface. Then, roller burnishing is performed on the main body sliding surface on which the surface treatment film is formed, thereby completing the gas stopper main body. By subjecting the main body sliding surface to roller burnishing, surface unevenness due to the difference in film thickness of the cutting process or the surface treatment coating is crushed, and a smooth sliding surface can be obtained.
せんは、鋳造された後、ガス栓本体と同様に、機械加工によって所定の形状、寸法及び精度に仕上げられ、せん摺動面に、前記本体摺動面に形成された表面処理被膜とは硬度の異なる樹脂、金属、又は、その複合材料による被膜が形成される。これにより、せん収容部にせんを収容した状態にては、本体摺動面には異なる表面硬度のせん摺動面が圧接する状態となり、本体摺動面及びせん摺動面に同じ材質の被膜が形成されて同じ表面硬度に構成された場合に比べて、摩擦力が小さくなる。 After being cast, the shell is machined and finished to a predetermined shape, size, and precision, as with the gas plug body. The surface treatment coating formed on the body sliding surface has a hardness. Films of different resins, metals, or composite materials thereof are formed. As a result, in the state in which the thread is accommodated in the thread accommodating portion, the thread sliding surface having a different surface hardness is pressed against the sliding surface of the main body, and the same material coating is applied to the main body sliding surface and the thread sliding surface. The frictional force is smaller than that in the case of forming the same surface hardness.
特に、前記めっき処理は電気亜鉛めっき処理とすると共に、前記化成被膜処理は三価クロムによるクロメート被膜処理とし、前記せん摺動面に設ける被膜は、リン酸マンガン系被膜と、さらにその表面に形成されるスズ被膜とからなるものでは、電気亜鉛めっき処理によって鋳鉄の素地に亜鉛めっき被膜が形成されることとなり、さらにその上から、クロメート被膜処理により三価クロムによる化成被膜が形成されることとなる。クロメート被膜処理は亜鉛めっきの後処理として一般的であり、表面処理被膜の耐食性を向上させることができる。鋳鉄に亜鉛めっき被膜を設けることにより、本体摺動面の硬度は、鋳鉄鋳物自体の硬度よりも柔らかくなる。
他方、せんの表面に形成する被膜は、リン酸マンガン系被膜とスズ被膜からなり、これにより、せんの表面には、本体摺動面に形成される表面処理被膜よりもさらに柔らかい被膜が形成されることとなる。尚、これには公知の表面処理法が適用可能である。
In particular, the plating treatment is an electrogalvanization treatment, the chemical conversion coating treatment is a chromate coating treatment with trivalent chromium, and the coating provided on the sliding surface is formed on the surface of the manganese phosphate coating. is made of a tin coating to be, will be galvanized coating into a green body of cast iron by electrolytic zinc plating is formed, further thereon, the chemical conversion coating by trivalent chromium chromate coating process is formed It becomes. The chromate film treatment is a general post-treatment of galvanization, and can improve the corrosion resistance of the surface treatment film. By providing the galvanized film on the cast iron, the hardness of the main body sliding surface becomes softer than the hardness of the cast iron casting itself.
On the other hand, the film formed on the surface of the thread is composed of a manganese phosphate-based film and a tin film. As a result, a film that is softer than the surface treatment film formed on the sliding surface of the main body is formed on the surface of the thread. The Rukoto. For this, a known surface treatment method can be applied.
（２）請求項２のものは、『ガス流路に連通するせん収容部を具備するガス栓本体と、前記せん収容部内にまわり対偶状態に収容されるせんとからなり、前記ガス流路の開閉は、前記せんの外周面であるせん摺動面を、前記せん収容部の内周面である本体摺動面に圧接させながら前記せんを回動させることにより行われるガス栓の製造方法』に関するもので、前述した課題と同様な課題を解決するために講じた本発明の解決手段は、
『前記ガス栓本体は、
鋳鉄の鋳造により製造される鋳造工程と、
前記鋳造工程で製造された前記ガス栓本体全体を機械加工により、所定の形状、寸法及び精度に全体を仕上げる本体加工工程と、
前記本体加工工程の後に、前記ガス栓本体全体にめっき処理を行って前記ガス栓本体の内外表面全体にめっき被膜を形成するめっき処理工程と、
前記めっき処理工程で形成されためっき被膜全体に化成被膜処理を行って化成被膜を形成する化成処理工程と、
前記めっき被膜と前記化成被膜とからなる表面処理被膜が形成された前記本体摺動面に、ローラバニッシング加工を行うバニッシング加工工程により製造され、
前記せんは、
鋳鉄の鋳造により製造される鋳造工程と、
前記鋳造工程で製造された前記せんを機械加工により所定の形状、寸法及び精度に仕上げるせん加工工程と、
前記せん加工工程後の前記せん摺動面に、前記ガス栓本体に形成されている前記表面処理被膜とは異なる材質及び硬度の樹脂、金属、又は、その複合材料による被膜を形成するせん被膜形成工程により製造され、
前記めっき処理工程で行われる前記めっき処理は電気亜鉛めっき処理とすると共に、前記化成処理工程で行われる化成被膜処理は三価クロムによるクロメート被膜処理とし、
前記せん被膜形成工程でせん摺動面に形成される被膜は、リン酸マンガン被膜と、その表面に形成されるスズ被膜からなること』を特徴とするもので、上記１項で記載した鋳鉄製のガス栓の場合と同じ作用が生じる。
(2) According to the second aspect of the present invention, “a gas stopper body having a thread accommodating portion communicating with the gas flow path, and a thread which is accommodated in a paired state around the gas accommodating portion, Opening and closing is performed by rotating the spiral while pressing the sliding surface, which is the outer peripheral surface of the spiral, against the sliding surface of the main body, which is the inner peripheral surface of the spiral housing portion. In order to solve the same problems as those described above, the solution means of the present invention,
"The gas plug body is
A casting process produced by casting cast iron;
A main body processing step of finishing the entire gas plug main body manufactured in the casting process to a predetermined shape, size and accuracy by machining,
After the main body processing step, a plating treatment step of forming a plating film on the entire inner and outer surfaces of the gas stopper main body by performing a plating treatment on the entire gas stopper main body,
A chemical conversion treatment step of forming a chemical conversion coating on the entire plating coating formed in the plating treatment step; and
The main body sliding surface on which the surface treatment film composed of the plating film and the chemical conversion film is formed is manufactured by a burnishing process that performs roller burnishing,
The above
A casting process produced by casting cast iron;
A threading process for finishing the thread manufactured in the casting process to a predetermined shape, size and precision by machining;
Spiral film formation for forming a film of resin, metal, or a composite material thereof having a material and hardness different from those of the surface treatment film formed on the gas plug body on the sliding surface of the spiral after the spiral processing step Manufactured by the process ,
The plating treatment performed in the plating treatment step is an electrogalvanization treatment, and the chemical conversion coating treatment performed in the chemical conversion treatment step is a chromate coating treatment with trivalent chromium.
The coating formed on the spiral sliding surface in the spiral coating forming step is characterized by comprising a manganese phosphate coating and a tin coating formed on the surface thereof . The same effect as in the case of the gas stopper.
以上のように、請求項１に係る発明によれば、ガス栓本体は、めっき処理及び化成被膜処理によって表面処理被膜が形成される前に、機械加工によって、本体摺動面を含むガス栓本体全体が、所定の形状、寸法、精度になるように仕上げられているので、製造工程を簡素化することができる。言い換えれば、表面処理被膜が形成された後には、本体摺動面に切削加工を行わないから、本体摺動面には表面処理被膜が確実に形成されることとなる。よって、潤滑用、気密用のグリスが性能を維持したままで前記本体摺動面とせん摺動面との間に介在させることができ、せんの操作力や気密性が長期に渡って安定すると共に、確実な防錆効果も期待できる。 As described above, according to the first aspect of the present invention, the gas plug main body includes the main body sliding surface by machining before the surface treatment film is formed by the plating treatment and the chemical conversion coating treatment. Since the whole is finished so as to have a predetermined shape, size, and accuracy, the manufacturing process can be simplified. In other words, after the surface treatment film is formed, the main body sliding surface is not cut, so that the surface treatment film is reliably formed on the main body sliding surface. Therefore, the grease for lubrication and airtightness can be interposed between the sliding surface of the main body and the sliding surface of the body while maintaining the performance, and the operation force and airtightness of the threading can be stabilized for a long time. At the same time, a reliable anti-rust effect can be expected.
さらに、例えば、金属の電気めっき処理で形成されためっき被膜の膜厚は、コーナ部やエッジ部及びその近傍で厚くなるので、ガス栓本体においては、本体摺動面の上端部やガス流路への連通口近傍部分における膜厚が、他の部分に比べて厚くなるが、これら部分は、錆びの発生し易い部分であるから、防錆効果が高くなる。
尚、本体摺動面には、めっき処理及び化成被膜処理が施されて表面処理被膜が形成された後に、ローラバニッシング加工が施されるから、本体摺動面における表面処理被膜の膜厚の差による凹凸は、素地の切削加工による微小凹凸と共に押し潰されて、精密性又はシール性が要求される本体摺動面を平滑な表面に形成することができる。
Further, for example, the thickness of the plating film formed by the electroplating process of the metal becomes thicker at the corner portion, the edge portion, and the vicinity thereof. Although the film thickness in the vicinity of the communication port becomes thicker than other parts, these parts are rust-prone parts, so that the rust prevention effect is enhanced.
Since the main body sliding surface is subjected to a plating process and a chemical conversion film treatment to form a surface treatment film and then a roller burnishing process, the difference in film thickness of the surface treatment film on the main body sliding surface is applied. The unevenness due to can be crushed together with the minute unevenness due to the cutting of the substrate, and the main body sliding surface requiring precision or sealability can be formed on a smooth surface.
又、せんの表面に形成する被膜を、ガス栓本体の内外表面全体に形成した表面処理被膜とは異なる硬度の材質からなるものにしたから、本体摺動面及びせん摺動面が、同じ材質の被膜が形成されて同じ表面硬度に構成された場合に比べて、せんの回動時の摩擦力が小さくなり、相互間のカジリツキが発生することがない。よって、せん収容部内でせんを円滑に回動させることができる。 In addition, since the coating formed on the surface of the shell is made of a material having a hardness different from that of the surface treatment coating formed on the entire inner and outer surfaces of the gas plug body, the sliding surface of the body and the sliding surface of the body are made of the same material. Compared with the case where the film is formed and the same surface hardness is formed, the frictional force when the screw is rotated is reduced, and no galling occurs between them. Therefore, the thread can be smoothly rotated in the thread housing portion.
さらに、本体摺動面に形成するめっき被膜を亜鉛めっき被膜とすることによって、鋳鉄の素地が露出していた従来のものに比べて本体摺動面の硬度を柔らかくすることができる。せん摺動面に形成する被膜を、亜鉛めっき被膜よりもさらに柔らかい金属材料により形成したから、本体摺動面とせん摺動面とのなじみ合わせがよくなり、ガス栓の気密性が向上すると共に、カジリツキもないため、せんの円滑な回動操作が可能となる。又、本体摺動面が鉄素地である場合に比べて、せん摺動面の被膜の磨耗が減少するから、ガス栓の耐久性も向上する。 Furthermore, the hardness of the sliding surface of the main body can be made softer than the conventional one in which the base of the cast iron is exposed by using a galvanized coating as the plating film formed on the sliding surface of the main body. The coating formed on the sliding surface is made of a metal material that is softer than the galvanized coating, so the fitting between the sliding surface of the main body and the sliding surface is improved, and the airtightness of the gas stopper is improved. Since there is no galling, smooth turning operation of the thread is possible. In addition, since the wear of the coating on the sliding surface is reduced as compared with the case where the sliding surface of the main body is an iron base, the durability of the gas stopper is also improved.
請求項２に係る発明によれば、請求項１に係る発明のガス栓を製造することができる。
According to the
以下に、本発明を実施するための最良の形態について添付図面を参照しながら説明する。
本願発明の実施の形態におけるガス栓としては、図４に示したような、鋳鉄品としてのガス栓本体(1)とせん(2)と操作ハンドル(3)とを具備する、主に、ガスメータのメータ本体の上流側のガス配管に接続されるガス栓とした。
The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.
As the gas stopper in the embodiment of the present invention, as shown in FIG. 4, a gas meter comprising a gas stopper main body (1), a thread (2) and an operation handle (3) as cast iron products is mainly used. The gas plug connected to the gas pipe on the upstream side of the meter body.
まず、図１に基づいて、ガス栓本体(1)及びせん(2)の構成の概略について簡単に説明する。
従来の背景技術において説明したように、ガス栓本体(1)は、上方に開放すると共に逆円錐台形状のせん(2)が略密嵌状態に収容されるせん収容部(10)と、その上方開放端に連続する筒状部(12)とを備えた構成となっており、せん収容部(10)の両側方には、ネジ筒部からなるガス流路(1a)が同軸上に並ぶように連通している。
First, based on FIG. 1, the outline of a structure of a gas stopper main body (1) and a shell (2) is demonstrated easily.
As described in the conventional background art, the gas plug body (1) includes a screw housing portion (10) that opens upward and accommodates the inverted truncated cone-shaped screw (2) in a substantially tightly-fitted state. It has a configuration including a cylindrical part (12) continuous to the upper open end, and gas flow paths (1a) made up of screw cylindrical parts are arranged coaxially on both sides of the thread accommodating part (10). So communicate.
筒状部(12)の上端部の内周面には、後述する操作ハンドル(3)を抜止め状態に連結させる為の円弧状のフランジ部(13)が内方に部分的に内方に向かって突設されている。
せん(2)は、せん収容部(10)内に丁度収容される大きさの上方に向かって拡径する逆円錐台形状体であり、ガス流路(1a)の連通口に対応する位置には両者を連通させるためのガス通過孔(20)が貫通している。
On the inner peripheral surface of the upper end portion of the cylindrical portion (12), an arc-shaped flange portion (13) for connecting an operation handle (3) described later in a retaining state is partially inward. It protrudes toward you.
The thread (2) is an inverted frustoconical body whose diameter increases toward the upper side of the size that is just accommodated in the thread accommodating part (10), and is located at a position corresponding to the communication port of the gas flow path (1a). Has a gas passage hole (20) for communicating the two.
又、せん(2)の上面には、操作ハンドル(3)に相対回動阻止状態に連結させるために先端が略直方体状に形成された係合凸部(22)が設けられており、その高さは、せん(2)をせん収容部(10)に収容した状態で、先端が筒状部(12)の上端開放部に達する程度に設定されている。又、係合凸部(22)の基端部を囲むように、コイルバネ(4)（図４参照）を受けるための環状凹部(23)が形成されている。 Further, on the upper surface of the thread (2), there is provided an engaging convex part (22) whose tip is formed in a substantially rectangular parallelepiped shape so as to be connected to the operation handle (3) in a state of preventing relative rotation. The height is set such that the tip reaches the upper end open portion of the cylindrical portion (12) in a state where the strand (2) is accommodated in the strand accommodating portion (10). Further, an annular recess (23) for receiving the coil spring (4) (see FIG. 4) is formed so as to surround the proximal end portion of the engagement projection (22).
このせん(2)を、操作ハンドル(3)の操作によって、せん収容部(10)内で９０度回動させることにより、ガス流路(1a)は開閉することとなる。
尚、操作ハンドル(3)は、図４に示すように、筒状部(12)に外嵌してその上方開放部を閉塞し且つせん(2)の係合凸部(22)に相対回動阻止状態に係合する連結部(30)と、前記連結部の側方に延長形成されているハンドル部(31)とから構成されている。
The gas channel (1a) is opened and closed by rotating the thread (2) by 90 degrees in the thread accommodating portion (10) by operating the operation handle (3).
As shown in FIG. 4, the operating handle (3) is externally fitted to the cylindrical portion (12) to close the upper open portion and is relatively rotated to the engaging convex portion (22) of the thread (2). The connecting portion (30) engaged in the movement preventing state and a handle portion (31) extending to the side of the connecting portion are configured.
ハンドル部(31)を持って所定の方向に回動させると、固定状態にあるガス栓本体(1)に対して、せん(2)は、操作ハンドル(3)の回動に伴って、せん収容部(10)内を、まわり対偶状態に回動する。
このとき、せん(2)の外周面は、せん収容部(10)の内周面に擦れ合うこととなり、せん(2)の外周面はせん摺動面(21)として、せん収容部(10)の内周面は本体摺動面(11)として機能する。
When the handle (31) is held and rotated in the specified direction, the screw (2) will move in response to the rotation of the operation handle (3) with respect to the gas plug body (1) that is fixed. The inside of the accommodating part (10) is rotated to a paired state.
At this time, the outer peripheral surface of the thread (2) rubs against the inner peripheral surface of the thread housing part (10), and the outer surface of the thread (2) serves as a thread sliding surface (21), and the thread housing part (10). The inner peripheral surface functions as a main body sliding surface (11).
次に、図２及び図３に基づいて、ガス栓本体(1)及びせん(2)の製造について説明する。
ガス栓本体(1)は、鋳造工程で、鋳鉄(5)により鋳造し、その後の本体加工工程で、切削加工によって、小さな凹凸が残る鋳肌面を削り取ると共に、ネジ筒部(12)の内周面や、ガス流路(1a)のネジ筒部や、さらには、せん収容部(10)等を、所定の形状、寸法、及び精度に仕上げた。この時点での、せん収容部(10)の内周面である本体摺動面(11)の表面粗さは、Ra０．４５μm、ガス栓本体(1)を構成している鉄鋳物の硬度は約２００ビッカースであった。
Next, based on FIG.2 and FIG.3, manufacture of a gas stopper main body (1) and a thread (2) is demonstrated.
The gas plug main body (1) is cast with cast iron (5) in the casting process, and in the subsequent main body processing process, the cast surface with small irregularities is scraped off by cutting, and the inside of the screw cylinder (12) The peripheral surface, the screw cylinder portion of the gas flow path (1a), the thread accommodating portion (10), and the like were finished in a predetermined shape, size, and accuracy. At this time, the surface roughness of the main body sliding surface (11), which is the inner peripheral surface of the thread accommodating portion (10), is Ra 0.45 μm, and the hardness of the iron casting constituting the gas plug main body (1) is About 200 Vickers.
本体加工工程によって仕上がり状態に機械加工されたガス栓本体(1)全体に、めっき処理工程で電気亜鉛めっき処理を施し、ガス栓本体(1)の内外表面全体に亜鉛めっき被膜(51)を形成した。
尚、本体摺動面(11)の全体に、亜鉛めっき被膜(51)を確実に形成するために、ガス栓本体(1)の形状を考慮し、ガス栓本体(1)の外表面に１５μmの亜鉛めっき被膜(51)を形成した。
The entire gas stopper body (1) machined to the finished state by the body processing process is electrogalvanized in the plating process to form a galvanized coating (51) on the entire inner and outer surfaces of the gas stopper body (1). did.
In order to reliably form the galvanized film (51) on the entire sliding surface (11) of the main body, the shape of the gas stopper main body (1) is taken into consideration, and the outer surface of the gas stopper main body (1) is 15 μm. A galvanized film (51) was formed.
その後、化成処理工程にて、亜鉛めっき被膜(51)の上から、化成被膜処理として、三価クロムによる、膜厚約２μm程のクロメート被膜(52)を形成した。
これにより、ガス栓本体(1)の内外表面全体に、亜鉛めっき被膜(51)とクロメート被膜(52)からなる表面処理被膜(50)が形成され、この状態での、本体摺動面(11)の表面粗さは、Ra０．４５μm、硬度は、６６ビッカースであった。
Thereafter, in the chemical conversion treatment step, a chromate film (52) having a film thickness of about 2 μm was formed from trivalent chromium as a chemical conversion film treatment on the galvanized film (51).
As a result, a surface treatment film (50) composed of a galvanized film (51) and a chromate film (52) is formed on the entire inner and outer surfaces of the gas plug main body (1), and the main body sliding surface (11 ) Has a surface roughness of Ra 0.45 μm and a hardness of 66 Vickers.
その後、バニッシング加工工程において、ガス栓本体(1)の精密性及びシール性が要求される本体摺動面(11)に、ローラバニッシング加工を施した。これにより、本体摺動面(11)の表面粗さは、Ra０．４μmとなり、硬度は、８５ビッカースになった。
これにて、ガス栓本体(1)が完成し、本体摺動面(11)の硬度は、鋳鉄の素地が露出したままの場合に比べて、かなり柔らかくすることができた。
Thereafter, in the burnishing process, roller burnishing was performed on the main body sliding surface (11), which requires the precision and sealing performance of the gas plug body (1). As a result, the surface roughness of the main body sliding surface (11) was Ra 0.4 μm, and the hardness was 85 Vickers.
As a result, the gas plug main body (1) was completed, and the hardness of the main body sliding surface (11) could be made much softer than when the cast iron base was left exposed.
せん(2)も、鋳造工程にて鋳鉄(5)で所定の形状に鋳造し、次のせん加工工程における切削加工にて、ガス通過孔(20)や、係合凸部(22)や、環状凹部(23)、さらには、せん摺動面(21)を、所定の形状、寸法、及び精度に仕上げた。この時点での、せん摺動面(21)の表面粗さは、Ra０．８μmであった。さらに、全体にローラバニッシング加工を施すことにより、せん摺動面(21)の表面粗さはRa０．６μmとなった。 The thread (2) is also cast into a predetermined shape with cast iron (5) in the casting process, and in the cutting process in the next threading process, the gas passage hole (20), the engaging convex part (22), The annular recess (23) and further the sliding surface (21) were finished to a predetermined shape, size, and accuracy. At this time, the surface roughness of the sliding surface (21) was Ra 0.8 μm. Furthermore, the surface roughness of the sliding surface (21) was Ra 0.6 μm by performing roller burnishing on the entire surface.
その後、せん被膜形成工程にて、せん(2)全体に、リン酸マンガン系被膜(53)を形成すると共に、さらに、その上に、スズ被膜(54)を形成し、膜厚が約７μmの表面処理被膜(55)を形成した。これにより、せん(2)が完成し、せん摺動面(21)の硬度は、５０ビッカースとなった。尚、せん(2)の表面に、リン酸マンガン系被膜(53)とスズ被膜(54)を形成することは、実公平４−７４０５号公報に開示されている。 After that, in the coating film forming step, a manganese phosphate-based film (53) is formed on the entire thread (2), and further, a tin coating (54) is formed thereon, and the film thickness is about 7 μm. A surface treatment film (55) was formed. As a result, thread (2) was completed, and the hardness of thread sliding surface (21) was 50 Vickers. The formation of a manganese phosphate coating (53) and a tin coating (54) on the surface of the thread (2) is disclosed in Japanese Utility Model Publication No. 4-7405.
上記した製造方法により完成したせん(2)のせん摺動面(21)に、潤滑・気密用のグリスを塗布して、せん(2)を、ガス栓本体(1)のせん収容部(10)内に、筒状部(12)の上方開放部から挿入する。その後、せん(2)の環状凹部(23)にコイルバネ(4)を装着し、その上から操作ハンドル(3)を、ガス栓本体(1)のフランジ部(13)に取り付ける。
尚、詳述しないが、操作ハンドル(3)も鋳鉄により鍛造され、切削加工された後に、防錆用に、所定のめっき処理が施されている。
Lubricating and airtight grease is applied to the thread sliding surface (21) of the thread (2) completed by the above manufacturing method, and the thread (2) is connected to the thread accommodating part (10 ) Is inserted from above the open part of the cylindrical part (12). Thereafter, the coil spring (4) is attached to the annular recess (23) of the thread (2), and the operation handle (3) is attached to the flange (13) of the gas plug main body (1) from above.
Although not described in detail, the operation handle (3) is also forged with cast iron and cut and then subjected to a predetermined plating treatment for rust prevention.
従来のガス栓本体(1)は、鍛造の後、機械加工を施し、その機械加工面に電気めっき処理を施し、電気めっき処理後の本体摺動面(11)にさらに仕上加工を施していたから、仕上加工が施された前記本体摺動面(11)は前記電気めっき被膜が削られて鋳鉄の素地が露出する態様となっていた。このため、本体摺動面(11)の硬度は鉄鋳物の硬度（２００）に相当し、それに対し、表面処理されたせん(2)のせん摺動面(21)は、かなり柔らかく仕上げられていた。そのため、硬い本体摺動面(11)に摺擦されるせん摺動面(21)の表面処理被膜が磨耗し易く、気密性に問題があった。 The conventional gas plug body (1) is machined after forging, electroplated on the machined surface, and further processed on the sliding surface (11) after electroplating. The main body sliding surface (11) on which the finishing process has been performed has a mode in which the electroplated coating is scraped to expose the cast iron base. For this reason, the hardness of the main body sliding surface (11) corresponds to the hardness of iron casting (200), whereas the surface of the surface-treated thread (2) has a fairly soft finish (21). It was. For this reason, the surface-treated film on the spiral sliding surface (21) that is rubbed against the hard main body sliding surface (11) is easily worn, and there is a problem in airtightness.
それに比べて、本願発明のガス栓では、ガス栓本体(1)に亜鉛めっき被膜を形成することにより、本体摺動面(11)の硬度が鉄鋳物の硬度に比べてかなり柔らかくなり、これに擦り合わせるせん摺動面(21)の硬度はそれ以上に柔らかく仕上げてあるから、両者のなじみ合わせが良くなり、気密性が向上する。 In contrast, in the gas stopper of the present invention, by forming a galvanized film on the gas stopper body (1), the hardness of the body sliding surface (11) becomes considerably softer than the hardness of the iron casting, Since the hardness of the sliding surface (21) to be rubbed is finished to be softer than that, the familiarity between the two becomes better and the airtightness is improved.
尚、両者にはそれぞれ異なる硬度の表面処理被膜(51)(55)を形成したから、相互間のカジリツキが発生しない上に、本体摺動面(11)に鉄素地が露出することがないので、グリスの性能を十分発揮させることができ、長期にわたってせん(2)の円滑な操作が可能になる上に、防錆効果も確実となる。
尚、上述した実施の形態では、ガス栓本体(1)の本体加工工程において、切削加工のみを施して仕上げたが、切削加工に加えてローラバニッシング加工も施しても良い。
Since the surface treatment films (51) and (55) having different hardnesses are formed on the both, no galling occurs between them and the iron base is not exposed on the sliding surface (11) of the main body. In addition, the grease performance can be fully exerted, the thread (2) can be smoothly operated over a long period of time, and the rust prevention effect is also ensured.
In the embodiment described above, in the main body processing step of the gas plug main body (1), only the cutting process is performed and finished. However, in addition to the cutting process, a roller burnishing process may be performed.
(1) ・・・・・・・・ガス栓本体
(10)・・・・・・・・せん収容部
(11)・・・・・・・・本体摺動面
(1a)・・・・・・・・ガス流路
(2) ・・・・・・・・せん
(21)・・・・・・・・せん摺動面
(50)(55)・・・・・・表面処理被膜
(51)・・・・・・・・めっき被膜（亜鉛めっき被膜）
(52)・・・・・・・・化成被膜(クロメート被膜)
(1) ... Gas stopper body
(10) ....
(11) ... Sliding surface of main body
(1a) ... Gas flow path
(2) ...
(21) ・ ・ ・ ・ ・ ・ ・ ・ Sliding surface
(50) (55) ・ ・ ・ ・ ・ ・ Surface treatment coating
(51) ・ ・ ・ ・ ・ ・ ・ ・ Plating coating (Zinc plating coating)
(52) ... Conversion coating (chromate coating)
Claims (2)
前記ガス栓本体及び前記せんは共に鋳鉄製とし、
前記ガス栓本体は、機械加工により、所定の形状、寸法及び精度に全体が仕上げられた後に施されるめっき処理と化成被膜処理によって全体にめっき被膜と化成被膜とからなる表面処理被膜が形成されると共に、前記表面処理被膜が形成された前記本体摺動面にローラバニッシング加工が施されてなるものとし、
前記せんは、機械加工により所定の形状、寸法及び精度に仕上げられた後の前記せん摺動面に、前記本体摺動面に形成された表面処理被膜とは異なる材質及び硬度の樹脂、金属、又は、その複合材料による被膜が形成され、
前記めっき処理は電気亜鉛めっき処理とすると共に、前記化成被膜処理は三価クロムによるクロメート被膜処理とし、
前記せん摺動面に設ける被膜は、リン酸マンガン系被膜と、さらにその表面に形成されるスズ被膜とからなることを特徴とするガス栓。 A gas stopper body having a thread accommodating portion communicating with the gas flow path and a thread that is accommodated in a paired state around the thread accommodating section, and the opening and closing of the gas flow path is the outer peripheral surface of the thread. In the gas stopper, which is performed by rotating the thread while bringing the sliding surface into pressure contact with the sliding surface of the main body which is the inner peripheral surface of the thread housing portion,
Both the gas stopper body and the thread are made of cast iron,
The gas plug main body is formed with a surface treatment film consisting of a plating film and a chemical conversion film by a plating process and a chemical conversion film process that are performed after the whole is finished to a predetermined shape, size and accuracy by machining. And roller burnishing processing is performed on the sliding surface of the main body on which the surface treatment film is formed,
The thread is a resin, metal having a material and hardness different from the surface treatment film formed on the sliding surface of the main body on the thread sliding surface after being finished to a predetermined shape, size and accuracy by machining. Or a film of the composite material is formed ,
The plating treatment is an electrogalvanizing treatment, and the chemical conversion coating treatment is a chromate coating treatment with trivalent chromium,
The gas stopper according to claim 1, wherein the coating provided on the sliding surface comprises a manganese phosphate coating and a tin coating formed on the surface thereof .
前記ガス栓本体は、
鋳鉄の鋳造により製造される鋳造工程と、
前記鋳造工程で製造された前記ガス栓本体全体を機械加工により、所定の形状、寸法及び精度に全体を仕上げる本体加工工程と、
前記本体加工工程の後に、前記ガス栓本体全体にめっき処理を行って前記ガス栓本体の内外表面全体にめっき被膜を形成するめっき処理工程と、
前記めっき処理工程で形成されためっき被膜全体に化成被膜処理を行って化成被膜を形成する化成処理工程と、
前記めっき被膜と前記化成被膜とからなる表面処理被膜が形成された前記本体摺動面に、ローラバニッシング加工を行うバニッシング加工工程により製造され、
前記せんは、
鋳鉄の鋳造により製造される鋳造工程と、
前記鋳造工程で製造された前記せんを機械加工により所定の形状、寸法及び精度に仕上げるせん加工工程と、
前記せん加工工程後の前記せん摺動面に、前記ガス栓本体に形成されている前記表面処理被膜とは異なる材質及び硬度の樹脂、金属、又は、その複合材料による被膜を形成するせん被膜形成工程により製造され、
前記めっき処理工程で行われる前記めっき処理は電気亜鉛めっき処理とすると共に、前記化成処理工程で行われる化成被膜処理は三価クロムによるクロメート被膜処理とし、
前記せん被膜形成工程でせん摺動面に形成される被膜は、リン酸マンガン被膜と、その表面に形成されるスズ被膜からなることを特徴とするガス栓の製造方法。 A gas stopper body having a thread accommodating portion communicating with the gas flow path and a thread that is accommodated in a paired state around the thread accommodating section, and the opening and closing of the gas flow path is the outer peripheral surface of the thread. In the method of manufacturing a gas stopper, which is performed by rotating the thread while bringing the sliding surface into pressure contact with the sliding surface of the main body, which is the inner peripheral surface of the thread housing portion,
The gas stopper body is
A casting process produced by casting cast iron;
A main body processing step of finishing the entire gas plug main body manufactured in the casting process to a predetermined shape, size and accuracy by machining,
After the main body processing step, a plating treatment step of forming a plating film on the entire inner and outer surfaces of the gas stopper main body by performing a plating treatment on the entire gas stopper main body,
A chemical conversion treatment step of forming a chemical conversion coating on the entire plating coating formed in the plating treatment step; and
The main body sliding surface on which the surface treatment film composed of the plating film and the chemical conversion film is formed is manufactured by a burnishing process that performs roller burnishing,
The above
A casting process produced by casting cast iron;
A threading process for finishing the thread manufactured in the casting process to a predetermined shape, size and precision by machining;
Spiral film formation for forming a film of resin, metal, or a composite material thereof having a material and hardness different from those of the surface treatment film formed on the gas plug body on the sliding surface of the spiral after the spiral processing step Manufactured by the process ,
The plating treatment performed in the plating treatment step is an electrogalvanization treatment, and the chemical conversion coating treatment performed in the chemical conversion treatment step is a chromate coating treatment with trivalent chromium.
The method of manufacturing a gas stopper, wherein the coating formed on the sliding surface in the spiral coating forming step comprises a manganese phosphate coating and a tin coating formed on the surface thereof .
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