JP2891912B2 - Valve box manufacturing method - Google Patents
Valve box manufacturing methodInfo
- Publication number
- JP2891912B2 JP2891912B2 JP7307560A JP30756095A JP2891912B2 JP 2891912 B2 JP2891912 B2 JP 2891912B2 JP 7307560 A JP7307560 A JP 7307560A JP 30756095 A JP30756095 A JP 30756095A JP 2891912 B2 JP2891912 B2 JP 2891912B2
- Authority
- JP
- Japan
- Prior art keywords
- valve box
- cast
- valve
- ring body
- inner peripheral
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Fee Related
Links
Landscapes
- Valve Housings (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、バタフライ弁等
の弁箱を製造する方法に関し、とくに、弁座が弁箱本体
の内周部に鋳込み接合された弁箱の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a valve box such as a butterfly valve, and more particularly to a method of manufacturing a valve box in which a valve seat is cast and joined to an inner peripheral portion of a valve box body.
【０００２】[0002]
【従来の技術】弁座が弁箱本体の内周部に鋳込み接合さ
れた弁箱は、ステンレス鋼製でリング状の埋め金を、主
型を貫通して設置された中子の外周部にセットし、鋳鉄
の溶湯を主型と中子との間に形成された鋳造空間内に流
し込んで固化させ、弁箱本体を鋳造しながら、埋め金の
外周部付近を弁箱本体の内周部に鋳込み接合し、次に埋
め金のうち、弁箱本体の内周面から突出した突出部を切
除して弁座を成形する方法によって製造される。2. Description of the Related Art A valve box in which a valve seat is cast and joined to an inner peripheral portion of a valve box main body is made of a stainless steel ring-shaped filling metal and is mounted on an outer peripheral portion of a core installed through a main mold. After setting, the molten cast iron is poured into the casting space formed between the main mold and the core, solidified, and while casting the valve box main body, the vicinity of the outer periphery of the filling is the inner periphery of the valve box main body. Then, a protruding portion of the filling metal protruding from the inner peripheral surface of the valve box body is cut off to form a valve seat.
【０００３】[0003]
【発明が解決しようとする課題】上記した方法によって
弁箱を製造した場合に、鋳鉄製の弁箱本体と、ステンレ
ス鋼製の埋め金とでは熱膨張率，融点，膨張収縮特性等
の対熱特性が相異するので、埋め金が弁箱本体に充分に
接合せずに弁箱本体と埋め金との接合部が剥離して埋め
金の接合強度が低下する問題点や、埋め金が楕円形状に
歪曲変形した状態で弁箱本体に装着される問題点があ
る。また、ステンレス鋼製の埋め金では溶湯に接触した
埋め金の表面に強固な酸化被膜が形成されるので、溶湯
が埋め金に溶着しにくくなる問題点がある。本発明は上
記問題点を解消し、弁箱本体と埋め金との接合状態およ
び接合強度を強化して弁座を適正な状態で弁箱本体に鋳
込み接合することを課題とするものである。When a valve box is manufactured by the above-described method, the cast iron valve box body and the stainless steel filling metal have heat resistance such as coefficient of thermal expansion, melting point, and expansion / shrinkage characteristics. Since the characteristics are different, the filler metal does not sufficiently bond to the valve box body, the joint between the valve box body and the filler metal peels, and the bonding strength of the filler metal decreases, and the filler metal is elliptical. There is a problem that it is mounted on the valve box body in a state of being distorted in shape. Further, in the case of the stainless steel filling metal, a strong oxide film is formed on the surface of the filling metal that has come into contact with the molten metal, and thus there is a problem that the molten metal is difficult to weld to the filling metal. SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems, to enhance the joining state and joining strength between a valve box body and a filling metal, and to cast and join a valve seat to a valve box body in an appropriate state.
【０００４】[0004]
【課題を解決するための手段】請求項１の発明は、主型
と、この主型を貫通して設置され、リング状の埋め金が
外周部にセットされた中子との間に形成された鋳造空間
内に溶湯を流し込んで弁箱本体を鋳造しながら、埋め金
の外周面側の要部を弁箱本体の内周部に鋳込み接合して
埋め金付き弁箱を作製してから、埋め金のうち、弁箱本
体の内周面から突出した突出部を切除して弁座を成形
し、弁座が弁箱本体の内周部に鋳込み接合された弁箱を
製造する製造方法において、弁座用の第１リング体と、
この第１リング体の内周面に固着されて第１リング体の
歪曲変形を阻止する第２リング体とが重ね合わされた埋
め金を中子にセットした状態で弁箱本体を鋳造しなが
ら、前記第１リング体の要部を弁箱本体の内周部に鋳込
み接合することを特徴とする。According to a first aspect of the present invention, there is provided a main mold, wherein a ring-shaped filling metal is formed between the main mold and a core set on an outer peripheral portion. While casting the molten metal into the casting space and casting the valve box body, the main part on the outer peripheral surface side of the buried metal is cast and joined to the inner peripheral part of the valve box body to produce a valve box with a buried metal, In a manufacturing method for manufacturing a valve box in which a protruding portion protruding from an inner peripheral surface of a valve box body is cut out to form a valve seat, and the valve seat is cast and joined to an inner peripheral portion of the valve box body. A first ring body for a valve seat;
While casting the valve box body with the burial set with the second ring body fixed to the inner peripheral surface of the first ring body and preventing the first ring body from being deformed being deformed being set on the core, The main part of the first ring body is cast and joined to the inner peripheral part of the valve body.
【０００５】請求項１の発明では、弁座用の第１リング
体と、この第１リング体の内周面に固着された第２リン
グ体とが重ね合わされた埋め金を中子にセットした状態
で溶湯が鋳造空間内に流し込まれ、溶湯の膨張，収縮に
伴う第１リング体の歪曲変形が第２リング体によって阻
止された状態で弁箱本体が鋳造されて第１リング体の外
周面側の要部が弁箱本体の内周部に鋳込み接合され、第
１リング体の突出部が切除されて弁座が成形される。According to the first aspect of the present invention, the filling metal in which the first ring member for the valve seat and the second ring member fixed to the inner peripheral surface of the first ring member are overlapped is set on the core. In this state, the molten metal is poured into the casting space, and the valve body is cast in a state where the first ring body is prevented from being deformed by the second ring body due to expansion and contraction of the molten metal, and the outer peripheral surface of the first ring body is cast. The main part on the side is cast into and joined to the inner peripheral part of the valve body, and the protruding part of the first ring body is cut off to form a valve seat.
【０００６】請求項２の発明は、請求項１記載の弁箱の
製造方法において、弁箱本体の内周部に鋳込み接合され
る鋳込み部の表面に溶湯との接触面積を拡大する凹凸面
が全周にわたって形成され、前記第１リング体と前記第
２リング体とが重ね合わされた埋め金を中子にセットし
た状態で弁箱本体を鋳造しながら、埋め金の外周面側の
要部を弁箱本体の内周部に鋳込み接合することを特徴と
する。According to a second aspect of the present invention, there is provided the valve box according to the first aspect.
In the manufacturing method, an uneven surface for increasing a contact area with a molten metal is formed on the surface of a cast portion which is cast and joined to an inner peripheral portion of the valve box main body over the entire circumference, and the first ring body and the first ring body are formed .
The main part on the outer peripheral surface side of the buried metal is cast and joined to the inner peripheral part of the valve box main body while casting the valve box body with the buried metal with the two ring bodies superimposed set on the core. And
【０００７】請求項２の発明では、弁箱本体の鋳造に際
し、第１リング体と第２リング体とが重ね合わされた埋
め金の鋳込み部と溶湯との接触面積が鋳込み部に形成さ
れた凹凸面によって拡大されて埋め金の鋳込み部によっ
て形成される弁座が弁箱本体に強固に鋳込み接合され
る。According to the second aspect of the present invention, when casting the valve body, the contact area between the molten metal and the cast portion where the first ring body and the second ring body are overlapped is determined by the cast area. The valve seat formed by the cast portion of the buried metal which is enlarged by the uneven surface formed in the above is firmly cast and joined to the valve box body.
【０００８】請求項３の発明は、請求項１または請求項
２記載の弁箱の製造方法において、めっき被膜がステン
レス鋼製の埋め金本体の表面に被覆された埋め金を中子
にセットした状態で弁箱本体を鋳造しながら前記埋め金
の外周面側の要部を弁箱本体の内周部に鋳込み接合する
ことを特徴とする。[0008] The invention of claim 3 is claim 1 or claim 1.
3. The method for manufacturing a valve box according to 2, wherein the valve body is cast while the padding whose plating film is coated on the surface of the stainless steel padding body is set in a core, and the outer peripheral surface side of the padding body is cast. The main part is cast and joined to the inner peripheral part of the valve body.
【０００９】請求項３の発明では、弁箱本体の鋳造に際
し、第１リング体と第２リング体とが重ね合わされたス
テンレス鋼製の埋め金本体と溶湯との接触が埋め金本体
の表面に被覆されためっき被膜によって阻止されて埋め
金本体の表面での酸化被膜の生成が防止される。According to the third aspect of the present invention, when the valve body is cast, the contact between the molten metal and the stainless steel filling metal body in which the first ring body and the second ring body are overlapped is filled. The formation of an oxide film on the surface of the embedded gold body is prevented by being prevented by the plating film coated on the surface of the gold body.
【００１０】[0010]
【実施例】次に、本発明の第１実施例を図１〜図４にし
たがって説明する。弁座２が弁箱本体１の内周部に鋳込
み接合された弁箱Ａの製造に使用される鋳型において、
主型（破砕可能な砂型）15にはセンタ孔15a と、弁箱本
体１の外周面を成形する成形面15b と、溶湯が注入され
る湯口15c および湯道15d とが形成されている。Next, a first embodiment of the present invention will be described with reference to FIGS. In a mold used for manufacturing a valve box A in which the valve seat 2 is cast and joined to the inner peripheral portion of the valve box body 1,
The main mold (crushable sand mold) 15 has a center hole 15a, a molding surface 15b for molding the outer peripheral surface of the valve box body 1, and a gate 15c and a runner 15d into which molten metal is poured.
【００１１】中子（破砕可能な砂型）16は主型15のセン
タ孔15a に挿通されて主型15を貫通した状態で設置さ
れ、中子16の外周面には弁箱本体１の内周面を成形する
成形面16a が形成されるとともに、主型15と中子16との
間には溶湯を流し込んで弁箱本体１を鋳造する鋳造空間
17が形成されている。A core (crushable sand mold) 16 is inserted through a center hole 15a of the main mold 15 and is installed so as to penetrate the main mold 15, and an outer peripheral surface of the core 16 has an inner peripheral surface of the valve box main body 1. A molding surface 16a for molding the surface is formed, and a casting space in which the molten metal is poured between the main mold 15 and the core 16 to cast the valve box body 1.
17 are formed.
【００１２】弁箱本体１の鋳造に際し、中子16の外周部
の中央部付近には弁箱本体１の内周部に鋳込み接合され
る弁座２に加工されるリング状の埋め金３がセットされ
る。In casting the valve body 1, a ring-shaped filling metal 3 is formed near the center of the outer periphery of the core 16 and is processed into a valve seat 2 which is cast and joined to the inner periphery of the valve body 1. Set.
【００１３】埋め金３は、本例では、SUS304等のステン
レススチ−ル材によって円筒状に形成された弁座用の第
１リング体４と、この第１リング体４の横幅より縮小さ
れた厚さを有し、外周面が第１リング体４の内周面に溶
接によって固着されて第１弁箱本体１の鋳造時の第１リ
ング体４の歪曲変形を阻止する円輪板状の第２リング体
５とが重ね合わされて形成されている。In this embodiment, the filling metal 3 is made smaller than a first ring member 4 for a valve seat formed of a stainless steel material such as SUS304 in a cylindrical shape, and the width of the first ring member 4. A ring-shaped plate having a thickness and having an outer peripheral surface fixed to the inner peripheral surface of the first ring body 4 by welding to prevent the first ring body 4 from being deformed during casting of the first valve body 1. The second ring body 5 is formed so as to overlap.
【００１４】第２リング体５としては、弁箱本体用の鋳
鉄の熱膨張率，膨張収縮特性，融点等の対熱特性と同様
な対熱特性を有する鋼鉄等の金属材が適用される。As the second ring body 5, a metal material such as steel having the same heat resistance as the heat expansion coefficient, expansion / shrinkage characteristic, melting point and the like of cast iron for a valve box body is applied.
【００１５】埋め金３を中子16にセットした状態では埋
め金３は、第１リング体４の内周部および第２リング体
５全体が中子16内に埋め込まれた状態で中子16の外周部
の幅方向中央部付近に装着され、弁箱本体１を鋳造した
状態では、埋め金３は第１リング体４の外周面側の要部
が弁箱本体１の内周部に鋳込み接合され、第１リング体
４の内周部および第２リング体５全体が弁箱本体１の内
周面1aから突出した状態で弁箱本体１の内周部に装着さ
れ、第１リング体４には弁箱本体１の内周部に鋳込み接
合された鋳込み部６と、弁箱本体１の内周面1aから突出
された突出部７とが形成される。When the filling 3 is set on the core 16, the filling 3 is inserted into the core 16 with the inner peripheral portion of the first ring 4 and the entire second ring 5 embedded in the core 16. In the state where the valve body 1 is cast in the vicinity of the center in the width direction of the outer peripheral portion of the first ring body 4, the main portion of the outer peripheral surface side of the first ring body 4 is cast into the inner peripheral portion of the valve body 1. The first ring body 4 is attached to the inner periphery of the valve body 1 with the inner periphery of the first ring body 4 and the entire second ring body 5 projecting from the inner periphery 1a of the valve body 1. 4, a cast portion 6 that is cast and joined to the inner peripheral portion of the valve box main body 1 and a projecting portion 7 that protrudes from the inner peripheral surface 1 a of the valve box main body 1 are formed.
【００１６】弁箱Ａの製造に際し、埋め金３を中子16の
外周部にセットした状態で溶湯を鋳造空間17内に流し込
んで固化させ、弁箱本体１を鋳造しながら、埋め金３の
うちの第１リング体４の外周面側の要部を弁箱本体１の
内周部に鋳込み接合し、埋め金３に鋳込み部６と突出部
７とを形成して埋め金付き弁箱Ｂを作製する。At the time of manufacturing the valve box A, the molten metal is poured into the casting space 17 and solidified while the filling metal 3 is set on the outer peripheral portion of the core 16. The main part on the outer peripheral surface side of the first ring body 4 is cast and joined to the inner peripheral part of the valve body 1, and the cast part 6 and the protruding part 7 are formed in the fill 3 to form a valve box B with a fill. Is prepared.
【００１７】次に、主型15および中子16を破砕して埋め
金付き弁箱Ｂを取り出し、埋め金３のうちの第１リング
体４の鋳込み部６を残して第１リング体４の突出部７お
よび第２リング体５を切除し、弁座２をその内周面2aが
弁箱本体１の内周面1aに整合されるように成形すると、
第１リング体４の鋳込み部６による弁座２が弁箱本体１
の内周部に鋳込み接合された弁箱Ａを製造することがで
きる。Next, the main mold 15 and the core 16 are crushed to take out the valve box B with the filling, and the cast ring portion 6 of the first ring body 4 of the filling 3 is left. When the protruding portion 7 and the second ring body 5 are cut off and the valve seat 2 is molded so that its inner peripheral surface 2a is aligned with the inner peripheral surface 1a of the valve box body 1,
The valve seat 2 formed by the cast portion 6 of the first ring body 4 is
The valve box A cast-joined to the inner peripheral portion of the valve box A can be manufactured.
【００１８】第１実施例によれば、埋め金３のうちの第
１リング体４が溶湯の膨張収縮挙動によって歪曲変形し
易い素材によって形成されていても、溶湯の膨張収縮挙
動に伴う第１リング体４の歪曲変形を第２リング体５に
よって阻止した状態で弁箱本体１を鋳造して第１リング
体４の要部を弁箱本体１に的確に鋳込み接合することが
できる。すなわち、第２リング体５が中子16内に埋め込
まれた状態で弁箱本体１が鋳造され、第２リング体５へ
の熱伝導が妨げられて第２リング体５が低温域に保持さ
れ、第２リング体５の熱膨張や熱歪が小さくなって第２
リング体５が第１リング体４の歪曲変形を強固に阻止す
るので、適正な形態を有する弁座２を弁箱本体１に装着
して弁箱本体１への弁座２の装着状態を安定化すること
ができる。According to the first embodiment, even if the first ring member 4 of the filling metal 3 is formed of a material which is easily deformed by the expansion and contraction behavior of the molten metal, the first ring body 4 accompanying the expansion and contraction behavior of the molten metal is formed. The valve box main body 1 is cast in a state where the distortion deformation of the ring body 4 is prevented by the second ring body 5, and the main part of the first ring body 4 can be accurately cast and joined to the valve box main body 1. That is, the valve box main body 1 is cast in a state where the second ring body 5 is embedded in the core 16, heat conduction to the second ring body 5 is hindered, and the second ring body 5 is held in a low temperature region. The thermal expansion and thermal strain of the second ring body 5 become small,
Since the ring body 5 strongly prevents the first ring body 4 from being deformed, the valve seat 2 having an appropriate shape is mounted on the valve box main body 1 and the mounting state of the valve seat 2 on the valve box main body 1 is stabilized. Can be
【００１９】次に、図５，図６に示す本発明の第２実施
例について説明すると、本例では、中子にセットされる
埋め金3Aは第１実施例と同様に第１リング体と第２リン
グ体とが重ね合わされて形成されている。この埋め金3A
の第１リング体には弁箱本体１の内周部に鋳込み接合さ
れる鋳込み部6Aと、弁箱本体１の内周面1aから突出され
る突出部7Aとが形成されるとともに、鋳込み部6Aの表面
には、断面形状がのこ刃状で条溝および突条がねじ状に
配列された凹凸面８が全周にわたって形成されている。Next, a second embodiment of the present invention shown in FIGS. 5 and 6 will be described. In this embodiment, the filling 3A set in the core is the same as that of the first embodiment with the first ring body. 2nd phosphorus
Are formed on top of each other. This fill 3A
The first ring body has a cast portion 6A cast into and joined to the inner peripheral portion of the valve box main body 1 and a projecting portion 7A protruding from the inner peripheral surface 1a of the valve box main body 1. On the surface of 6A, a concavo-convex surface 8 having a saw-tooth shape in cross section and having grooves and projections arranged in a screw shape is formed over the entire circumference.
【００２０】第１実施例と同様に、埋め金3Aを中子16の
外周部にセットした状態で、溶湯を鋳造空間17内に流し
込んで弁箱本体１を鋳造しながら、埋め金3Aの外周面側
の要部を弁箱本体１の内周部に鋳込み接合して埋め金3A
に鋳込み部6Aと突出部7Aとを形成し、埋め金付き弁箱を
作製してから、主型15および中子16を破砕して埋め金付
き弁箱を取出し、埋め金付き弁箱の埋め金3Aのうちの鋳
込み部6Aを残して突出部7Aを切除し、弁座2Aをその内周
面2aA が弁箱本体１の内周面1aに整合されるように成形
すると、埋め金3Aの鋳込み部6Aによる弁座2Aが弁箱本体
１の内周部に鋳込み接合された弁箱Ａを製造することが
できる。In the same manner as in the first embodiment, with the filling 3A set on the outer periphery of the core 16, the molten metal is poured into the casting space 17 to cast the valve body 1, and the outer periphery of the filling 3A is formed. The main part on the side of the surface is cast and joined to the inner peripheral part of the valve box body 1 to fill the filling 3A.
After forming a cast portion 6A and a protruding portion 7A in the mold, a valve box with a filling is manufactured, then the main mold 15 and the core 16 are crushed to take out the valve box with a filling, and the valve box with a filling is filled. The protruding portion 7A is cut off while leaving the cast portion 6A of the gold 3A, and the valve seat 2A is formed so that its inner peripheral surface 2aA is aligned with the inner peripheral surface 1a of the valve box body 1. The valve box A in which the valve seat 2A formed by the cast portion 6A is cast and joined to the inner peripheral portion of the valve box body 1 can be manufactured.
【００２１】第２実施例によれば、弁箱本体１の鋳造時
に埋め金3Aと溶湯との接触面積を凹凸面10によって拡大
して弁箱本体１と埋め金3Aの鋳込み部6Aとの接合強度を
増強することができ、弁箱本体１と弁座２との接合状態
を強化および安定化することができる。According to the second embodiment, when the valve box body 1 is cast, the contact area between the filling metal 3A and the molten metal is enlarged by the uneven surface 10 to join the valve box body 1 with the casting 6A of the filling metal 3A. The strength can be increased, and the joining state between the valve body 1 and the valve seat 2 can be strengthened and stabilized.
【００２２】次に、図７，図８に示す本発明の第３実施
例について説明すると、本例では弁箱本体１の鋳造時に
中子にセットされる埋め金3Bは、第１実施例と同様に第
１リング体９と第２リング体とが重ね合わされて形成さ
れたステンレス鋼製の埋め金本体と、この埋め金本体の
表面に被覆されて埋め金本体と溶湯との接触を阻止し、
埋め金本体の表面での酸化被膜の生成を防止するめっき
被膜10とによって形成されている。Next, a third embodiment of the present invention shown in FIGS. 7 and 8 will be described. In this embodiment, the filling 3B set in the core when the valve body 1 is cast differs from that of the first embodiment. Similarly
The first ring body 9 and the second ring body are overlapped and formed.
And stainless steel filled alloy body was, to prevent contact with the surface is coated with the filling alloy body fills alloy body and the melt,
A plating film 10 to prevent the formation of oxide film on the surface of the buried metal body is formed by.
【００２３】めっき被膜10は例えばニッケル−りんめっ
き等のめっき処理によって埋め金本体９の表面に50〜20
0 μｍの厚さで被覆される。The plating film 10 is coated on the surface of the burying metal body 9 by plating treatment such as nickel-phosphorus plating.
Coated with a thickness of 0 μm.
【００２４】埋め金3Bを中子の外周部にセットした状態
で溶湯を鋳造空間内に流し込んで弁箱本体１を鋳造しな
がら埋め金3Bの外周面側の要部を弁箱本体１の内周部に
鋳込み接合し、埋め金付き弁箱を作製してから埋め金3B
の突出部7Bを切除すると、埋め金3Bの鋳込み部6Bによる
座金2Bが弁箱本体１の内周部に鋳込み接合された弁箱Ａ
を製造することができる。The molten metal is poured into the casting space with the filler metal 3B set on the outer peripheral portion of the core to cast the valve box main body 1 while the main portion on the outer peripheral surface side of the filler metal 3B is inserted into the valve box main body 1. Casting and joining to the periphery to make a valve box with a filling, then filling 3B
When the protruding portion 7B is cut off, the washer 2B formed by the cast portion 6B of the filling metal 3B is cast into and joined to the inner peripheral portion of the valve box body 1.
Can be manufactured.
【００２５】第３実施例によれば、埋め金3Bの表面での
酸化被膜の生成をめっき被膜10によって防止して埋め金
3Bへの溶湯の溶着状態を強化し、弁箱本体１と弁座２と
の接合状態を強化および安定化することができる。According to the third embodiment, the formation of an oxide film on the surface of the filling 3B is prevented by the plating film 10 and
The welded state of the molten metal to 3B can be strengthened, and the joint state between valve body 1 and valve seat 2 can be strengthened and stabilized.
【００２６】また、第１リング体４と第２リング体５と
を有し、鋳込み部の表面に凹凸面８が形成された埋め金
本体の表面にめっき被膜が被覆されてなる埋め金を中子
16にセットして弁箱本体１を鋳造し、埋め金付き弁箱Ｂ
を作製するようにしてもよい。[0026] Further, a buried metal having a first ring body 4 and a second ring body 5 in which a plating film is coated on the surface of a buried metal body having an uneven surface 8 formed on the surface of a cast portion is provided. Child
Set to 16 and cast the valve box body 1, and fill the valve box B
May be produced.
【００２７】[0027]
【発明の効果】請求項１の発明によれば、埋め金のうち
の第１リング体が溶湯の膨張収縮挙動によって歪曲変形
し易い素材によって形成されていても、溶湯の膨張収縮
挙動に伴う第１リング体の歪曲変形を第２リング体によ
って阻止した状態で弁箱本体を鋳造して第１リング体を
弁箱本体に鋳込み接合することができる。すなわち、第
２リング体が中子内に埋め込まれた状態で弁箱本体が鋳
造され、第２リング体への熱伝導が妨げられて第２リン
グ体が低温域に保持され、第２リング体の熱膨張や熱歪
が小さくなって第２リング体が第１リング体の歪曲変形
を強固に阻止するので、適正な形態を有する弁座を弁箱
本体に装着して弁箱本体への弁座の装着状態を安定化す
ることができる。According to the first aspect of the present invention, even if the first ring body of the filling metal is formed of a material that is easily deformed by the expansion and contraction behavior of the molten metal, the first ring body is not affected by the expansion and contraction behavior of the molten metal. The valve box main body can be cast in a state where the distortion deformation of the one ring body is prevented by the second ring body, and the first ring body can be cast and joined to the valve box main body. That is, the valve body is cast in a state where the second ring body is embedded in the core, heat conduction to the second ring body is hindered, the second ring body is held in a low temperature range, and the second ring body is held. Since the thermal expansion and thermal distortion of the first ring body are reduced and the second ring body firmly prevents the first ring body from being deformed, a valve seat having an appropriate form is mounted on the valve box body, and the valve to the valve box body is mounted. The mounting state of the seat can be stabilized.
【００２８】請求項２の発明によれば、弁箱本体の鋳造
時に埋め金と溶湯との接触面積を凹凸面によって拡大し
て弁箱本体と埋め金の鋳込み部との接合強度を増強する
ことができ、弁座の鋳込み形態を適正にして弁箱本体と
弁座との接合状態を強化および安定化することができ
る。According to the second aspect of the present invention, when the valve body is cast, the contact area between the filling metal and the molten metal is enlarged by the uneven surface to enhance the bonding strength between the valve body and the casting portion of the filling material. By properly casting the valve seat, it is possible to strengthen and stabilize the joint state between the valve box body and the valve seat.
【００２９】請求項３の発明によれば、埋め金の表面で
の酸化被膜の生成をめっき被膜によって防止して埋め金
と溶湯との溶着状態を強化することができ、弁座の鋳込
み形態を適正にして弁箱本体と弁座との接合状態を強化
および安定化することができる。According to the third aspect of the present invention, the formation of an oxide film on the surface of the filling metal can be prevented by the plating film, and the welding state between the filling metal and the molten metal can be strengthened.
The joint state between the valve box body and the valve seat can be strengthened and stabilized by setting the proper form .
【図１】本発明の第１実施例を示すもので、弁箱の製造
に使用する鋳型の縦断面図である。FIG. 1 shows a first embodiment of the present invention, and is a longitudinal sectional view of a mold used for manufacturing a valve box.
【図２】同じく、埋め金の縦断面図である。FIG. 2 is a longitudinal sectional view of a buried metal.
【図３】同じく、埋め金付き弁箱の半側断面図である。FIG. 3 is a half sectional view of a valve box with a filling.
【図４】同じく、弁箱の半側断面図である。FIG. 4 is a half sectional view of the valve box.
【図５】本発明の第２実施例を示す埋め金の縦断面図で
ある。FIG. 5 is a longitudinal sectional view of a filling metal according to a second embodiment of the present invention.
【図６】同じく、弁箱の半側断面図である。FIG. 6 is a half sectional view of the valve box.
【図７】本発明の第３実施例を示す埋め金の縦断面図で
ある。FIG. 7 is a longitudinal sectional view of a filling metal according to a third embodiment of the present invention.
【図８】同じく、弁箱の半側断面図である。FIG. 8 is a half sectional view of the valve box.
１ 弁箱本体 ２，2A，2B 弁座 ３，3A，3B 埋め金 ４ 第１リング体 ５ 第２リング体 ６，6A，6B 鋳込み部 ７，7A，7B 突出部 15 主型 16 中子 Ａ 弁箱 Ｂ 埋め金付き弁箱 1 Valve body 2, 2A, 2B Valve seat 3, 3A, 3B Filler 4 First ring body 5 Second ring body 6, 6A, 6B Casting part 7, 7A, 7B Projection part 15 Main mold 16 Core A valve Box B Filled valve box
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｆ１６Ｋ 27/00 Ｆ１６Ｋ 27/00 Ａ ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 6 Identification code FI F16K 27/00 F16K 27/00 A
Claims (3)
リング状の埋め金が外周部にセットされた中子との間に
形成された鋳造空間内に溶湯を流し込んで弁箱本体を鋳
造しながら、埋め金の外周面側の要部を弁箱本体の内周
部に鋳込み接合して埋め金付き弁箱を作製してから、埋
め金のうち、弁箱本体の内周面から突出した突出部を切
除して弁座を成形し、弁座が弁箱本体の内周部に鋳込み
接合された弁箱を製造する製造方法において、弁座用の
第１リング体と、この第１リング体の内周面に固着され
て第１リング体の歪曲変形を阻止する第２リング体とが
重ね合わされた埋め金を中子にセットした状態で弁箱本
体を鋳造しながら、前記第１リング体の要部を弁箱本体
の内周部に鋳込み接合する弁箱の製造方法。Claims: 1. A main mold, and installed through the main mold,
While pouring the molten metal into the casting space formed between the ring-shaped filling metal and the core set on the outer peripheral part to cast the valve box body, the main part on the outer peripheral surface side of the filling metal is removed from the valve box body. After casting and joining to the inner peripheral part of the valve to make a valve box with a filling, the protruding part of the filling protruding from the inner peripheral surface of the valve box body is cut off to form a valve seat, and the valve seat is In a manufacturing method for manufacturing a valve box cast and joined to an inner peripheral portion of a valve box main body, a first ring body for a valve seat and a distortion of the first ring body fixed to an inner peripheral surface of the first ring body. The main part of the first ring body is cast into and joined to the inner peripheral part of the valve box body while the valve box body is cast in a state in which the filling metal on which the second ring body for preventing deformation is overlapped is set in the core. Method of manufacturing a valve box.
て、弁箱本体の内周部に鋳込み接合される鋳込み部の表
面に溶湯との接触面積を拡大する凹凸面が全周にわたっ
て形成され、前記第１リング体と前記第２リング体とが
重ね合わされた埋め金を中子にセットした状態で弁箱本
体を鋳造しながら、埋め金の外周面側の要部を弁箱本体
の内周部に鋳込み接合する弁箱の製造方法。2. A method for manufacturing a valve box according to claim 1.
The surface of the cast portion that is cast and joined to the inner peripheral portion of the valve box body is formed with an uneven surface that expands the contact area with the molten metal over the entire circumference , and the first ring body and the second ring body are
A method for manufacturing a valve box, in which a main part on the outer peripheral surface side of a fill metal is cast and joined to an inner peripheral part of the valve box main body while casting the valve box main body in a state where the superimposed fill is set in a core.
造方法において、前記第１リング体と前記第２リング体
とが重ね合わされたステンレス鋼製の埋め金本体の表面
にめっき被膜が被覆された埋め金を中子にセットした状
態で弁箱本体を鋳造しながら、前記埋め金の外周面側の
要部を弁箱本体の内周部に鋳込み接合する弁箱の製造方
法。3. The valve box according to claim 1 or claim 2.
In the manufacturing method, the first ring body and the second ring body
While casting the valve box body in a state in which the surface of the stainless steel fill metal body on which the plating is covered with the plating film is set on the core, the main part on the outer peripheral surface side of the fill metal is removed. A method of manufacturing a valve box which is cast and joined to an inner peripheral portion of a valve box body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7307560A JP2891912B2 (en) | 1995-11-27 | 1995-11-27 | Valve box manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7307560A JP2891912B2 (en) | 1995-11-27 | 1995-11-27 | Valve box manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09144924A JPH09144924A (en) | 1997-06-03 |
| JP2891912B2 true JP2891912B2 (en) | 1999-05-17 |
Family
ID=17970561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7307560A Expired - Fee Related JP2891912B2 (en) | 1995-11-27 | 1995-11-27 | Valve box manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2891912B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013015254A1 (en) * | 2011-07-26 | 2013-01-31 | 日本精工株式会社 | Steering column and manufacturing method thereof, and steering device using said steering column |
| US11090713B2 (en) * | 2017-09-29 | 2021-08-17 | Fisher Controls International Llc | Bi-metal valve body casting and method of making same |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55152964A (en) * | 1979-05-14 | 1980-11-28 | Maezawa Kogyo Kk | Butterfly valve and its manufacturing method |
| JPH03142058A (en) * | 1989-10-30 | 1991-06-17 | Atsugi Unisia Corp | Method for casting by embedding |
-
1995
- 1995-11-27 JP JP7307560A patent/JP2891912B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09144924A (en) | 1997-06-03 |
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