JPH054941Y2 - - Google Patents
Info
- Publication number
- JPH054941Y2 JPH054941Y2 JP1988028188U JP2818888U JPH054941Y2 JP H054941 Y2 JPH054941 Y2 JP H054941Y2 JP 1988028188 U JP1988028188 U JP 1988028188U JP 2818888 U JP2818888 U JP 2818888U JP H054941 Y2 JPH054941 Y2 JP H054941Y2
- Authority
- JP
- Japan
- Prior art keywords
- engine valve
- rotary table
- welding
- shaft
- overlay
- 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 - Lifetime
Links
- 238000003466 welding Methods 0.000 claims description 69
- 239000000463 material Substances 0.000 claims description 20
- 239000000843 powder Substances 0.000 claims description 8
- 239000000919 ceramic Substances 0.000 claims description 6
- 239000003638 chemical reducing agent Substances 0.000 claims description 6
- 239000007789 gas Substances 0.000 description 29
- 238000000034 method Methods 0.000 description 14
- 239000002184 metal Substances 0.000 description 12
- 229910052751 metal Inorganic materials 0.000 description 12
- 230000007547 defect Effects 0.000 description 7
- 239000000498 cooling water Substances 0.000 description 6
- 239000011261 inert gas Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- LNSPFAOULBTYBI-UHFFFAOYSA-N [O].C#C Chemical group [O].C#C LNSPFAOULBTYBI-UHFFFAOYSA-N 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 230000009970 fire resistant effect Effects 0.000 description 3
- 239000010953 base metal Substances 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910000601 superalloy Inorganic materials 0.000 description 1
- 230000003685 thermal hair damage Effects 0.000 description 1
Landscapes
- Butt Welding And Welding Of Specific Article (AREA)
- Arc Welding In General (AREA)
Description
［産業上の利用分野］
本考案は、エンジンバルブの軸端面に耐熱性、
耐摩耗性の材料をプラズマアーク肉盛溶接するに
さいし、該エンジンバルブを固定する装置に関す
るものである。
［従来の技術］
自動車エンジンバルブに用いられているインテ
ークバルブ、エキゾーストバルブ等のエンジンバ
ルブは燃焼室における吸気あるいは排気をつかさ
どる弁であり、傘部と軸部とからなる。このエン
ジンバルブの軸端部はカムと軸端面で常に密着
し、こすれ合つている。更に、バルブフエース面
は燃焼室内においては600〜800℃にさらされてお
り、軸端部においても400〜600℃の高温となつて
おり、エンジンバルブの軸端面に対しては、耐熱
性、耐摩耗性が要求される。
従来エンジンバルブの軸端部に上記耐熱性、耐
摩耗性を具備させるために、軸端面の表面改質と
して、焼入れ等の熱処理を施したり、軸端部に耐
熱性、耐摩耗性に優れた材料、例えばコバルト基
超合金等を酸素−アセチレンガスを用いたガス溶
接法で肉盛溶接されている。
軸端面に表面改質を施したバルブは、現状の熱
処理技術では耐摩耗性に限界があり、耐久性に問
題がある。そこで耐熱性、耐摩耗性に優れたコバ
ルト基の超耐熱合金等を軸端部に溶着させるの
に、酸素−アセチレンガスを用いたガス溶接法が
従来より採用されている。この酸素−アセチレン
ガスによるガス溶接法で、バルブ軸端を肉盛溶接
する場合は、肉盛個所の母材を予熱する工程が必
要であり、又溶着速度も遅く、量産化のための肉
盛溶接方法としては十分ではなかつた。
そこで、本考案者等は、高能率な肉盛溶接方法
であるプラズマアーク溶接法を、バルブ軸端の肉
盛溶接に適用するため、鋭意研究を行つた。
［考案が解決しようとする課題］
プラズマアーク溶接法においては、アークは非
常に高温のプラズマ状態にあり、肉盛材料の粉末
は効率良く溶融、密着されるため、肉盛材料の歩
留が高く高能率な肉盛溶接法である。しかしバル
ブ軸端部へ肉盛溶接する場合、被肉盛部材たるバ
ルブ軸端部は熱容量が小さいため、プラズマアー
ク溶接法を適用した場合、バルブ軸端部、母材が
瞬時に溶融し、溶け落ちたり、溶融プールを保持
できないなどの問題が生じる。溶接入熱量を低減
させれば、母材の溶け落ちを防止できるが、融合
不良が発生し易く、肉盛溶接材料の粉体の歩留が
低下するなどの問題点がある。又プラズマアーク
溶接では、溶接時に、プラズマ作動ガスや溶融金
属を大気からシールドするためのシールドガス
（Ar，He等の不活性ガス）および粉体供給ガス
を肉盛溶接個所へ流している。そのため、溶融金
属の凝固時に、上記不活性ガスが浮上しきれず
に、内部欠陥として残存するという問題もあつ
た。
上記の問題点から、プラズマアーク溶接法がバ
ルブ軸端への肉盛溶接に、これまで採用されなか
つた。
尚、特開昭61−150778号、特開昭61−140370号
公報において、プラズマ肉盛溶接による肉盛溶接
部材保持装置が開示されているが、エンジンバル
ブのフエース面を肉盛溶接するためのエンジンバ
ルブ保持装置であり、バルブ軸端部を肉盛溶接す
るためのエンジンバルブ保持装置ではない。
本考案者らは、上記問題点を解消するために
種々検討を重ね、本考案を完成した。即ち、本考
案はエンジンバルブ軸端部に肉盛溶接材料をプラ
ズマアーク溶接法により溶着させるためのもので
あつて、歩留を低下させることなく、溶融プール
を保持でき内部欠陥が残存しない、エンジンバル
ブ軸端肉盛溶接用固定装置を提供しようとするも
のである。
［課題を解決するための手段］
本考案の第１の考案は、エンジンバルブの傘表
部を搭載させられる回転テーブルと、該回転テー
ブルを回転させるためのモータおよび減速機とこ
れらを支持するための支持台と、前記回転テーブ
ルの上面に、該エンジンバルブの軸外周部を囲う
ように周設された筒体とからなり、該筒体はエン
ジンバルブ軸端の肉盛溶接部に対応する側壁に１
個以上のプラズマ作動ガス、シールドガスおよび
粉体供給ガス放散用貫通孔（スリツトを含む。以
下貫通孔と総称する）を有することを特徴とした
エンジンバルブ軸端のプラズマアーク肉盛溶接用
固定装置にあり、また第２の考案は、エンジンバ
ルブの傘表部を搭載する回転テーブルと、該回転
テーブルを回転するためのモータおよび減速機
と、これらを支持するための支持台と、前記回転
テーブルの上面に該エンジンバルブの軸外周部を
囲うように周設した多孔質の高耐熱セラミツク焼
結部材製筒体とからなる、エンジンバルブ軸端の
プラズマアーク肉盛溶接用固定装置である。
以下、本考案の構成を、第１図〜第４図を参照
して説明する。第１図は本考案を採用するエンジ
ンバルブ軸端のプラズマアーク肉盛溶接装置の主
要部の概略説明図であり、同図において、ターン
テーブル支持台１はプラズマアーク溶接トーチ１
２直下に配置し、該ターンテーブル支持台１にモ
ータ２および減速機３を配置し、該減速機３の回
転軸４に導電性に優れた銅製の回転テーブル５を
取付ける。回転テーブル５の上面に、筒体６をエ
ンジンバルブ固定孔６ａの孔芯が該回転テーブル
５の回転軸と一致するように取付ける。又冷却能
の高い銅製の筒体６は過熱をふせぐため、冷却水
が中空孔部６ｂに循環するようになつており、８
は冷却水を供給するための供給口、９は冷却水の
排水口を示す。筒体６は、エンジンバルブ７の軸
外周部を囲うように周設されており、該筒体６の
エンジンバルブ軸端部に対応する側壁には貫通孔
６ｃが設けられている。エンジンバルブ７は筒体
６に形成されたエンジンバルブ固定孔６ａに取付
られた板バネ１０によつてバルブ傘裏部７ｄが押
圧され、バルブ傘表部７ｃが回転テーブル５と接
し、載置されている。７ａはエンジンバルブ軸
部、１１は溶着金属、１２はプラズマアーク溶接
トーチを示す。なおこの例では筒体は銅製にして
いるが、他の耐熱金属やセラミツク製としても良
い。
第２図はエンジンバルブ軸端肉盛溶接用固定装
置における筒体６の他の実施例を示すもので、筒
体６のエンジンバルブ軸端部に対応する側壁にス
リツト１３を設けたもので、第１図における貫通
孔６ｃとと同様プラズマ作動ガス、シールドガス
等の不活性ガスが該スリツト１３を通じて、筒体
外へ放散するので、肉盛金属中にブローホール等
の内部欠陥が生成しない。又第３図はエンジンバ
ルブ軸端肉盛溶接用固定装置における筒体６の他
の実施例である。この実施例では筒体６の部材が
高耐熱性の多孔質のセラミツク焼結部材から成つ
ている。このような多孔質で耐熱性の良好な耐火
材では、筒体全体に無数の貫通孔を設けたことと
なり、ことさら第１図のような貫通孔や第２図の
ようなスリツトを設ける加工を必要とせず、また
冷却水を流す必要がないため、製作コストを低減
できる。
第４図に示したエンジンバルブ軸端肉盛溶接用
固定装置における筒体６は形状が直方体のもので
ある。筒体部材の素材の形状が角柱であれば、直
方体に、あるいは丸棒であれば円筒形にと、加工
の容易な形状の筒体に加工すればよく、製作コス
トの安い方を選択すればよい。
［作用］
以下本考案の作用について説明する。
本考案において、エンジンバルブ軸端部に肉盛溶
接材料を所定の肉盛厚さに溶着させるため、エン
ジンバルブの軸外周部を囲うように、耐火性の材
料よりなる筒体を周設させ、該エンジンバルブの
軸芯が回転テーブルの回転軸に一致させるように
嵌合させていることは、エンジンバルブ軸端部の
角部が過度に溶融されて、母材が溶け落ちたり、
溶融された肉盛溶融材料が流失するのを防止し、
母材への溶込み深さを均一にして、均一な溶着金
属を得ることにある。
プラズマアーク溶接では、溶接時には、プラズマ
作動ガスや溶融金属を大気から遮蔽し、溶着金属
の酸化防止のためのシールドガスおよび粉体供給
ガスとして不活性ガスを溶接トーチより下方の肉
盛溶接個所に絶えず流している。エンジンバルブ
軸端の肉盛溶接にプラズマアーク溶接を行つた場
合、プラズマ作動ガス、シールドガスおよび粉体
供給ガスの不活性ガスが凝固時に浮上しきれずに
内部欠陥として残存することがあつた。そこで本
考案のエンジンバルブ軸端肉盛溶接用固定装置に
おいて、耐火性の材料よりなる筒体のエンジンバ
ルブ軸端部に対応する側壁に１個以上の貫通孔や
スリツトを設けたり、又は筒体が多孔質の高耐熱
セラミツク焼結部材を用いることにより、ブロホ
ール等の欠陥が生成されるのを防止することがで
きる。
耐火性の材料よりなる筒体のエンジンバルブ軸
端部に対応する側壁に貫通孔の代りに、スリツト
を設けても、貫通孔と同様に、プラズマ作動ガ
ス、シールドガスおよび粉体供給ガスの不活性ガ
スが、溶接時に、該スリツトより筒体外へ放散さ
れるため、肉盛金属中にブロホール等の内部欠陥
の生成を防止できる。
請求項２に記載のエンジンバルブ軸端肉盛溶接
用固定装置において、筒体に多孔質の高耐熱性セ
ラミツク焼結部材を用いることは、筒体が多孔質
であるため、エンジンバルブ軸端部に対応する側
壁には、無数の貫通孔が設けられていることとな
り、プラズマ作動ガス、シールドガス等の不活性
ガスが筒体外へ容易に放散されるため、肉盛金属
中のブローホール等の内部欠陥の生成を防止でき
る。そして銅等の筒体では、量産過程における、
長時間肉盛溶接を行う場合、プラズマアークの高
熱によつて、熱損傷のおそれがあり、冷却構造と
しなければならないが、高耐熱部材は高耐熱性を
有するため、熱損傷のおそれはなく、冷却系を考
慮した複雑な構造が必要でなく、本考案の装置の
製作コストは低減できる。
［実施例］
第１図に示した本考案のエンジンバルブ軸端肉
盛溶接用固定装置を用い、エンジンバルブ材に
JIS規格SUH3（マルテンサイト系耐熱鋼）を供
し、軸径φ5mm、φ8mmのインテークバルブの軸端
面に凹面加工を施した後、プラズマアーク溶接法
により、Co基超耐熱合金を肉盛溶接材料に用い
て、肉盛溶接を行つた。さらに比較例として、酸
素−アセチレンガスを用いたガス溶接により上記
エンジンバルブ材にCo基超耐熱合金で肉盛溶接
をおこなつた。第２表にプラズマアーク溶接にお
ける溶接条件を示す。又上述の２種類の肉盛溶接
法による、肉盛厚さ２mmにエンジンバルブ軸端の
肉盛溶接における所要時間を第１表に示す。
[Industrial Application Field] This invention has heat-resistant,
The present invention relates to a device for fixing engine valves during plasma arc build-up welding of wear-resistant materials. [Prior Art] Engine valves such as intake valves and exhaust valves used in automobile engine valves are valves that control intake or exhaust air in a combustion chamber, and are composed of a cap portion and a shaft portion. The shaft end of this engine valve is always in close contact with the cam and the shaft end surface, rubbing against each other. Furthermore, the valve face surface is exposed to temperatures of 600 to 800 degrees Celsius in the combustion chamber, and the shaft ends are also exposed to high temperatures of 400 to 600 degrees Celsius. Abrasion resistance is required. Conventionally, in order to provide the above-mentioned heat resistance and wear resistance to the shaft end of an engine valve, heat treatment such as quenching is applied as a surface modification to the shaft end surface, or a material with excellent heat resistance and wear resistance is applied to the shaft end. Materials such as cobalt-based superalloys are overlay welded using a gas welding method using oxygen-acetylene gas. Valves whose shaft end surfaces are surface-modified have limited wear resistance using current heat treatment technology, and have problems with durability. Therefore, a gas welding method using oxygen-acetylene gas has been conventionally employed to weld a cobalt-based super heat-resistant alloy with excellent heat resistance and wear resistance to the shaft end. When overlaying the valve shaft end using this gas welding method using oxygen-acetylene gas, it is necessary to preheat the base material at the overlay point, and the welding speed is slow, making it difficult to overlay for mass production. This was not a sufficient welding method. Therefore, the present inventors conducted intensive research in order to apply the plasma arc welding method, which is a highly efficient overlay welding method, to overlay welding of the valve shaft end. [Problem to be solved by the invention] In the plasma arc welding method, the arc is in a very high temperature plasma state, and the powder of the overlay material is efficiently melted and adhered, so the yield of the overlay material is high. This is a highly efficient overlay welding method. However, when overlaying to the end of the valve shaft, the end of the valve shaft, which is the part to be overlaid, has a small heat capacity, so when plasma arc welding is applied, the end of the valve shaft and the base metal melt instantly. Problems such as falling or not being able to hold the molten pool occur. If the amount of welding heat input is reduced, burn-through of the base metal can be prevented, but there are problems such as poor fusion is likely to occur and the yield of powder of overlay welding material is reduced. Furthermore, in plasma arc welding, during welding, shielding gas (inert gas such as Ar, He, etc.) for shielding plasma working gas and molten metal from the atmosphere and powder supply gas are flowed to the overlay welding area. Therefore, there was a problem in that the inert gas could not fully float to the surface during solidification of the molten metal and remained as internal defects. Due to the above problems, the plasma arc welding method has not been adopted for overlay welding to the end of the valve shaft. Incidentally, JP-A-61-150778 and JP-A-61-140370 disclose overlay welding member holding devices using plasma overlay welding, but the This is an engine valve holding device, not an engine valve holding device for overlay welding the end of the valve shaft. The inventors of the present invention have conducted various studies to solve the above-mentioned problems, and have completed the present invention. That is, the present invention is for welding overlay welding material to the end of an engine valve shaft by plasma arc welding, and it is possible to maintain a molten pool without reducing the yield, and to prevent internal defects from remaining in the engine. It is an object of the present invention to provide a fixing device for overlay welding on the end of a valve shaft. [Means for Solving the Problems] The first aspect of the present invention is a rotary table on which an umbrella surface of an engine valve is mounted, a motor and a speed reducer for rotating the rotary table, and a device for supporting these. and a cylindrical body surrounding the outer periphery of the shaft of the engine valve on the upper surface of the rotary table, the cylindrical body having a side wall corresponding to the welded overlay at the end of the shaft of the engine valve. to 1
A fixing device for plasma arc overlay welding of an engine valve shaft end, characterized by having at least one through hole (including slits, hereinafter collectively referred to as the through hole) for dissipating plasma working gas, shielding gas, and powder supply gas. The second invention is a rotary table on which an umbrella surface of an engine valve is mounted, a motor and a speed reducer for rotating the rotary table, a support stand for supporting these, and the rotary table. This is a fixing device for plasma arc build-up welding of the end of an engine valve shaft, which comprises a cylindrical body made of a porous, highly heat-resistant ceramic sintered member, which is disposed around the upper surface of the engine valve so as to surround the outer periphery of the shaft of the engine valve. Hereinafter, the configuration of the present invention will be explained with reference to FIGS. 1 to 4. FIG. 1 is a schematic explanatory diagram of the main parts of a plasma arc overlay welding apparatus for the end of an engine valve shaft that adopts the present invention. In the figure, a turntable support 1 is a plasma arc welding torch 1
A motor 2 and a reducer 3 are placed on the turntable support 1, and a rotary table 5 made of copper with excellent conductivity is attached to the rotating shaft 4 of the reducer 3. The cylindrical body 6 is attached to the upper surface of the rotary table 5 so that the center of the engine valve fixing hole 6a coincides with the rotation axis of the rotary table 5. In addition, in order to prevent overheating, the copper cylinder 6 with high cooling ability circulates cooling water through the hollow hole 6b.
9 indicates a supply port for supplying cooling water, and 9 indicates a drain port for cooling water. The cylindrical body 6 is disposed around the outer periphery of the shaft of the engine valve 7, and a through hole 6c is provided in a side wall of the cylindrical body 6 corresponding to the end of the engine valve shaft. The engine valve 7 is placed on the rotary table 5 with the valve head back part 7d being pressed by the leaf spring 10 attached to the engine valve fixing hole 6a formed in the cylinder body 6, and the valve head front part 7c being in contact with the rotary table 5. ing. 7a is an engine valve shaft, 11 is a welded metal, and 12 is a plasma arc welding torch. In this example, the cylindrical body is made of copper, but it may be made of other heat-resistant metals or ceramics. FIG. 2 shows another embodiment of the cylindrical body 6 in the engine valve shaft end overlay welding fixing device, in which a slit 13 is provided in the side wall of the cylindrical body 6 corresponding to the engine valve shaft end. Similar to the through hole 6c in FIG. 1, inert gas such as plasma working gas and shielding gas is diffused out of the cylinder through the slit 13, so that no internal defects such as blowholes are generated in the overlay metal. FIG. 3 shows another embodiment of the cylindrical body 6 in the fixing device for overlay welding of the end of an engine valve shaft. In this embodiment, the member of the cylinder 6 is made of a highly heat-resistant porous ceramic sintered member. In such a porous and heat-resistant refractory material, there are countless through holes throughout the cylinder, and it is especially difficult to create through holes as shown in Figure 1 or slits as shown in Figure 2. Since it is not necessary and there is no need to run cooling water, manufacturing costs can be reduced. The cylinder body 6 in the engine valve shaft end overlay welding fixing device shown in FIG. 4 has a rectangular parallelepiped shape. If the shape of the material of the cylindrical member is a prism, it can be processed into a rectangular parallelepiped, or if it is a round bar, it can be processed into a cylindrical shape that is easy to process.Choose the one with the lowest production cost. good. [Operation] The operation of the present invention will be explained below. In the present invention, in order to weld the build-up welding material to the end of the engine valve shaft to a predetermined build-up thickness, a cylindrical body made of a fire-resistant material is provided around the outer circumference of the engine valve shaft, Fitting the engine valve so that its axis coincides with the rotation axis of the rotary table prevents the base material from melting down due to excessive melting of the corner of the end of the engine valve shaft.
Prevents melted overlay material from flowing away,
The goal is to achieve uniform weld metal by making the depth of penetration into the base material uniform. In plasma arc welding, during welding, the plasma working gas and molten metal are shielded from the atmosphere, and an inert gas is supplied to the overlay welding area below the welding torch as a shield gas and powder supply gas to prevent oxidation of the weld metal. It's constantly flowing. When plasma arc welding was used for overlay welding on the end of an engine valve shaft, the plasma working gas, shielding gas, and inert gas of the powder supply gas could not be fully floated up during solidification and remained as internal defects. Therefore, in the engine valve shaft end welding fixing device of the present invention, one or more through holes or slits are provided in the side wall corresponding to the engine valve shaft end of the cylindrical body made of a fire-resistant material, or the cylindrical body is By using a porous highly heat-resistant ceramic sintered member, defects such as blowholes can be prevented from being generated. Even if a slit is provided instead of a through hole in the side wall of a cylinder made of a fire-resistant material corresponding to the end of the engine valve shaft, it will still prevent plasma working gas, shielding gas, and powder supply gas from flowing in the same manner as through holes. During welding, the active gas is diffused out of the cylindrical body through the slit, so it is possible to prevent the formation of internal defects such as blowholes in the overlay metal. In the engine valve shaft end welding fixing device according to claim 2, using a porous highly heat-resistant ceramic sintered member for the cylinder body is advantageous because the cylinder body is porous. Countless through holes are provided in the corresponding side wall, and inert gases such as plasma working gas and shielding gas are easily dissipated out of the cylinder, so blowholes etc. in the overlay metal are easily dissipated. The generation of internal defects can be prevented. In the case of cylinders made of copper, etc., during the mass production process,
When performing overlay welding for a long time, there is a risk of thermal damage due to the high heat of the plasma arc, and a cooling structure must be used. A complicated structure considering the cooling system is not required, and the manufacturing cost of the device of the present invention can be reduced. [Example] Using the engine valve shaft end welding fixing device of the present invention shown in Fig. 1, an engine valve material was
Using JIS standard SUH3 (martensitic heat-resistant steel), we applied concave processing to the shaft end faces of intake valves with shaft diameters of 5 mm and 8 mm, and then used Co-based super heat-resistant alloy as the overlay welding material using plasma arc welding. Then, overlay welding was performed. Furthermore, as a comparative example, overlay welding of Co-based super heat-resistant alloy was performed on the above engine valve material by gas welding using oxygen-acetylene gas. Table 2 shows welding conditions for plasma arc welding. Table 1 also shows the time required for overlay welding of the end of an engine valve shaft to a thickness of 2 mm using the two types of overlay welding methods described above.
【表】
第１表から明らかなように、エンジンバルブの
軸端部の肉盛溶接における所要時間は、従来法の
酸素、アセテレンガス溶接法に比べて本考案のプ
ラズマアーク溶接用のエンジンバルブ軸端肉盛溶
接用固定装置を用いたプラズマアーク溶接法の方
が著しく短縮されている。[Table] As is clear from Table 1, the time required for overlay welding of the engine valve shaft end using the plasma arc welding method of the present invention is longer than that of the conventional oxygen and acetelene gas welding method. Plasma arc welding using a fixing device for overlay welding is significantly shorter.
【表】
［考案の効果］
以上により明らかなように、エンジンバルブ軸
端への肉盛溶接において、本考案を用いれば、溶
着効率が高く、高能率なプラズマアーク溶接法の
肉盛溶接手段が可能となり、均一な溶着金属を形
成するための溶接所要時間を著しく低減し、もつ
てエンジンバルブ軸端に肉盛溶接された肉盛エン
ジンバルブを著しく安価なものとすることができ
る利点がある。[Table] [Effects of the invention] As is clear from the above, if the present invention is used in overlay welding to the end of an engine valve shaft, a highly efficient plasma arc welding method with high welding efficiency can be achieved. This has the advantage of significantly reducing the time required for welding to form uniform weld metal, and making it possible to significantly reduce the cost of overlay engine valves that are overlay welded to the end of the engine valve shaft.
第１図は本考案に係るエンジンバルブ軸端のプ
ラズマアーク肉盛溶接用固定装置の部分断面側面
図、第２〜４図は本考案の他の実施態様例である
筒体部分の斜視図である。
１……ターンテーブル支持台、２……モータ、
３……減速機、４……回転軸、５……回転テーブ
ル、６……筒体、６ａ……エンジンバルブ固定
孔、６ｂ……冷却用中空孔、６ｃ……貫通孔、７
……エンジンバルブ、７ａ……エンジンバルブ軸
部、７ｂ……エンジンバルブ軸端、７ｃ……エン
ジンバルブ傘表、７ｄ……エンジンバルブ傘裏、
８……冷却水用給水口、９……冷却水用排出口、
１０……バネ板、１１……溶着金属、１２……プ
ラズマアーク溶接トーチ、１３……スリツト。
Fig. 1 is a partial cross-sectional side view of a fixing device for plasma arc overlay welding of the end of an engine valve shaft according to the present invention, and Figs. 2 to 4 are perspective views of a cylindrical body part that is another embodiment of the present invention. be. 1...Turntable support stand, 2...Motor,
3... Reduction gear, 4... Rotating shaft, 5... Rotating table, 6... Cylindrical body, 6a... Engine valve fixing hole, 6b... Hollow hole for cooling, 6c... Through hole, 7
...Engine valve, 7a...Engine valve shaft portion, 7b...Engine valve shaft end, 7c...Engine valve umbrella front, 7d...Engine valve umbrella back,
8... Cooling water inlet, 9... Cooling water outlet,
10...Spring plate, 11...Welding metal, 12...Plasma arc welding torch, 13...Slit.
Claims (1)
ブルと、該回転テーブルを回転させるためのモ
ータおよび減速機と、これらを支持するための
支持台と、前記回転テーブルの上面に該エンジ
ンバルブの軸外周部を囲うように周設された筒
体とからなり、該筒体はエンジンバルブ軸端部
に対応する側壁に１個以上のプラズマ作動ガ
ス、シールドガスおよび粉体供給ガス放散用の
貫通孔を有することを特徴としたエンジンバル
ブ軸端のプラズマアーク肉盛溶接用固定装置。 (2) エンジンバルブの傘表部を搭載する回転テー
ブルと、該回転テーブルを回転させるためのモ
ータおよび減速機と、これらを支持するための
支持台と、前記回転テーブルの上面に該エンジ
ンバルブの軸外周部を囲うように周設した多孔
質の高耐熱セラミツク焼結部材製筒体とからな
ることを特徴としたエンジンバルブ軸端のプラ
ズマアーク肉盛溶接用固定装置。[Claims for Utility Model Registration] (1) A rotary table on which the umbrella surface of the engine valve is mounted, a motor and a speed reducer for rotating the rotary table, a support base for supporting these, and a rotary table for rotating the rotary table. It consists of a cylindrical body disposed on the top surface of the table so as to surround the outer periphery of the shaft of the engine valve, and the cylindrical body has one or more plasma working gas, shielding gas and A fixing device for plasma arc overlay welding of an engine valve shaft end, characterized by having a through hole for dispersing powder supply gas. (2) A rotary table on which the umbrella surface of the engine valve is mounted, a motor and a reducer for rotating the rotary table, a support stand for supporting these, and a rotary table on which the engine valve is mounted on the upper surface of the rotary table. A fixing device for plasma arc overlay welding of the end of an engine valve shaft, characterized by comprising a cylinder made of a porous, highly heat-resistant ceramic sintered material surrounding the outer circumference of the shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988028188U JPH054941Y2 (en) | 1988-03-04 | 1988-03-04 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988028188U JPH054941Y2 (en) | 1988-03-04 | 1988-03-04 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01135172U JPH01135172U (en) | 1989-09-14 |
| JPH054941Y2 true JPH054941Y2 (en) | 1993-02-08 |
Family
ID=31251341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988028188U Expired - Lifetime JPH054941Y2 (en) | 1988-03-04 | 1988-03-04 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH054941Y2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6123572A (en) * | 1984-07-12 | 1986-02-01 | Daido Steel Co Ltd | Manufacture of engine valve |
| JPS61283461A (en) * | 1985-06-07 | 1986-12-13 | Mitsubishi Metal Corp | Build-up welding method for stem end of engine valve |
-
1988
- 1988-03-04 JP JP1988028188U patent/JPH054941Y2/ja not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6123572A (en) * | 1984-07-12 | 1986-02-01 | Daido Steel Co Ltd | Manufacture of engine valve |
| JPS61283461A (en) * | 1985-06-07 | 1986-12-13 | Mitsubishi Metal Corp | Build-up welding method for stem end of engine valve |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01135172U (en) | 1989-09-14 |
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