JPS5870934A - Manufacture of hollow nozzle blade - Google Patents
Manufacture of hollow nozzle bladeInfo
- Publication number
- JPS5870934A JPS5870934A JP17008181A JP17008181A JPS5870934A JP S5870934 A JPS5870934 A JP S5870934A JP 17008181 A JP17008181 A JP 17008181A JP 17008181 A JP17008181 A JP 17008181A JP S5870934 A JPS5870934 A JP S5870934A
- Authority
- JP
- Japan
- Prior art keywords
- hollow
- nozzle
- nozzle blade
- blade
- plate
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/78—Making other particular articles propeller blades; turbine blades
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は中望ノズル翼の製造法に係り、舟に高渭度で且
つ安浦な中空ノズル翼の４造を志向した中望ノズル翼の
製造法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a medium-view nozzle blade, and more particularly, to a method of manufacturing a medium-view nozzle blade that is intended for use in a boat with four hollow nozzle blades that are high in elevation and easy to use.
まず、従来のノズル翼の製造方法を説明する。First, a conventional method for manufacturing nozzle blades will be explained.
第１図は、従来の中実ノズル翼を示す斜視図、第２南は
、従来の中空ノズル翼の一例を示す断面図、第３図は、
従来の中空ノズル翼の池の例を示す断面図である。各図
において同一番号を付したものは同一部分である。FIG. 1 is a perspective view showing a conventional solid nozzle blade, second south is a sectional view showing an example of a conventional hollow nozzle blade, and FIG.
FIG. 2 is a sectional view showing an example of a pond of a conventional hollow nozzle blade. In each figure, the same numbers indicate the same parts.
従来、ノズル翼としては、一般に圧延材からの削り出し
や鋳造、鍛造などの手段によりｅ造した、４１図に示す
ような、その内部が中実で、入口部１ａと出口部ｉｂと
を有し、三次元的に複雑な形状を有する中実ノズル翼１
が使用されていた。このような中実ノズル翼１は重量が
大きく、コストも高いので、ノズル翼を中空化する対策
がなされている。Conventionally, nozzle blades have generally been e-formed by cutting out rolled material, casting, forging, etc., and have a solid interior and an inlet part 1a and an outlet part ib, as shown in Fig. 41. A solid nozzle blade 1 having a three-dimensionally complex shape
was used. Since such a solid nozzle blade 1 is heavy and expensive, measures have been taken to make the nozzle blade hollow.
従来の中空・ノズル翼の一例は、第２図に示すように、
その内部に中空部６を有し、背板３と腹板４の部材から
構成されるものである。この中空ノズル翼２の製造方法
は、まず金型によって所定形状の背板３．腹板４をプレ
ス加工したのちに、機械卵工により相互に溶接開先を形
成させる。ついで背板３と腹板４を組立て、溶接変形防
止治具に取付けて、溶接部５により結合して中空ノズル
Ａ２が形成される。この場合、背板３および腹板４が薄
いため（３，２〜６．３ ａｍ ） ｓ前記変形防止治
具を夏用するにもかかわらず変形を生じ、最終的な寸法
公差には収まらない。そのため、溶接後、ノ・ツマリン
グなどの手段により疹正したのちに、全面を・］嫡１戒
卵工などによる仕上げで最終許容公差内に収め、所望形
状の中空ノズル翼２を製造する“ようにしていた。した
がって、多くの加工工数を要し、刀日エコストが高いと
いう欠点があった。An example of a conventional hollow nozzle blade is shown in Figure 2.
It has a hollow part 6 inside and is composed of a back plate 3 and a belly plate 4. The manufacturing method of this hollow nozzle blade 2 begins with a back plate 3 of a predetermined shape using a mold. After the belly plate 4 is pressed, welding grooves are formed on each other using a mechanical machine. Next, the back plate 3 and the belly plate 4 are assembled, attached to a welding deformation prevention jig, and joined by the welded portion 5 to form the hollow nozzle A2. In this case, because the back plate 3 and the belly plate 4 are thin (3.2 to 6.3 am), deformation occurs even though the deformation prevention jig is used in the summer, and the final dimensional tolerances are not met. . Therefore, after welding, the problem is corrected by cutting, cutting, etc., and then the entire surface is finished by a craftsman, etc., to within the final tolerance, and the hollow nozzle blade 2 of the desired shape is manufactured. Therefore, it required a lot of processing man-hours and had the disadvantage of high manufacturing cost.
従来の中空ノズル翼の他の例は、第３図に示すように、
一枚の中空成形板７を曲げ加工などによる成形後に、端
部を溶接せしめ、中受ノズル翼２人を形成していた。こ
の第３図に床る７ 逅方法は、前記した第２図に床る製
造方法に比べ、溶接による変ノｅは少ないものの、ノズ
ル翼の管軸方向の形状は、第１図の中実ノズル翼１が示
すように、直線ではなく油源であるため、三次元的積度
を出すのが困難であるという欠点がめった。Another example of the conventional hollow nozzle blade is as shown in FIG.
After forming a single hollow molded plate 7 by bending or the like, the ends were welded to form two intermediate receiving nozzle blades. Although the manufacturing method shown in Figure 3 has fewer deformities due to welding than the manufacturing method shown in Figure 2, the shape of the nozzle blade in the tube axis direction is similar to that shown in Figure 1. As the nozzle blade 1 shows, since the oil source is not a straight line, it is difficult to obtain a three-dimensional accumulation, which is a drawback.
本発明は、上記した従来技術の欠点を除去して、高、１
度の中空ノズル翼を安価に製造することができる中空ノ
ズル翼の製造法の提供を、その目的とするものである。The present invention eliminates the above-mentioned drawbacks of the prior art and provides high, 1
The object of the present invention is to provide a method for manufacturing hollow nozzle blades that can be manufactured at low cost.
本発明の特徴は、その内部が中空で、入口部と出口部と
を有する中空ノズル翼の製造法において、−１喘をコイ
ニングガロエした板材を曲げ刀ロエし、この板材の他端
と前記コイニング刃口工部とを接合することにより、予
め中空・ｇ体部と出口部とを肩するノズルＡ予Ｕ＋成形
品を形成したのち、このノズル翼予備成形品を、型閉め
したときに前記中空ノズル翼の児戟品とほぼ同一形状に
造形される空隙を設けたノズル翼成形用上、下ダづ内に
挿入し、前記中空・ｇ体部の中空部に液圧を加えながら
前記ノズル翼成形用上、下ダイを型閉めして、前記ノズ
ル４予ＩＮ成形品に管軸と垂直方向の荷重を負荷するこ
とにより、中空ノズル翼を成形する中空ノズル翼の製造
法にある。The feature of the present invention is that in the manufacturing method of a hollow nozzle blade which is hollow inside and has an inlet part and an outlet part, a plate material which has been coined with a -1 part is bent with a bending blade, and the other end of this plate material and the After forming a nozzle A pre-U+ molded product that shoulders the hollow/g body part and the outlet part by joining the coining blade mouth part, this nozzle blade pre-formed product is The nozzle is inserted into the upper and lower chambers for molding the nozzle blade, which has a gap formed into almost the same shape as the molded product of the hollow nozzle blade, and while applying hydraulic pressure to the hollow part of the hollow g body, The method of manufacturing a hollow nozzle blade includes closing the upper and lower dies for forming the blade and applying a load in a direction perpendicular to the tube axis to the nozzle 4 pre-molded product.
ざらに詳しくは１本発明の要点は、次の２点にある。More specifically, the main points of the present invention are the following two points.
すなわち、＠１の要点は、浴接→塑性加工（ノズル其成
形用上、下ダイによる中空ノズル翼ア成形）の工程にし
、４接を前工程として溶Ｍ（熱）変形の最終形状への影
響を抑えて高槽度興工化を図ったことにある。従来の、
第２図に床る製造方法のよう１Ｃ１刀ロエ（）゛レス刀
ロエ、！表１戒刀ロエ）→浴接の工程であると、どうし
ても溶接後の矯正、修正工程が省けず、多くの工数を責
やさざるを得ないという欠点を肩していたが、本発明に
おいては、前記塑性〃ロエ後の矯正、修正ヶ賛しない。In other words, the key point of @1 is to make the process from bath welding to plastic working (forming of the hollow nozzle blade by the upper and lower dies for nozzle formation), and with the 4th contact as the preceding process, melt M (thermal) deformation to the final shape. This is due to the efforts to reduce the impact and improve the construction quality of the tank. Traditional,
The manufacturing method shown in Figure 2 is 1C1 sword Roe ()゛less sword Roe,! Table 1 Kaito Roe) → The process of bath welding had the drawback that the correction and correction process after welding could not be omitted, requiring a large number of man-hours, but in the present invention, , the plasticity is not corrected or corrected after Roe.
第２の要点は、中壁ハ体部の形成の段階で、中空ノズル
翼の出口部もめらかしめ形成しておき。The second point is that at the stage of forming the inner wall body, the outlet part of the hollow nozzle blade is also smoothed and formed.
前記塑性ガ日工後には、入口部近傍のみ仕上げ加工する
ようにした。After the plastic machining, only the vicinity of the entrance portion was subjected to finish machining.
以下本発明を芙・４列によって説明する。Hereinafter, the present invention will be explained with reference to four rows.
第４図〜嚇７図は１本発明の一笑ｌ池例に・（ホ）る中
空ノズル翼の製造法を説明するための図であり、第４図
は、板材の一端をコイニング加工している状態紫示す、
ザ１面図、第５図は、第４図に泳るコイニング刃口工を
実姉したのちの板材を、曲げ加工している状態を示す、
雲面図、５嚇６図は、第５図に係る曲げ加工を実遁した
のちの板材の他端と、前記コイニンク刀ｌ工部とを浴接
してなるノズル翼予備成形品を示す４囲°図、第７図は
、第６図に係るノズル翼予備成形品をノズル翼成形用上
、下ダイ内に押入し、型閉めして、中空ノズル翼を成形
している状態を示す断面図である。Figures 4 to 7 are diagrams for explaining the manufacturing method of a hollow nozzle blade as an example of the present invention. Purple indicates the state of
The first view and Figure 5 show the state in which the plate material is being bent after the coining blade cutter shown in Figure 4 is used.
Figures 5 and 6 show a nozzle blade preformed product formed by contacting the other end of the plate material after the bending process shown in Figure 5 with the Koinink cut section. Figure 7 is a cross-sectional view showing the state in which the nozzle blade preform according to Figure 6 is pushed into the upper and lower dies for nozzle blade molding, the mold is closed, and a hollow nozzle blade is molded. It is.
合図において同一番号を付したものは同一部分である。Items with the same number in the signal are the same parts.
筐ず、シャー（図示せず）などの手段にょシ。Measures such as a housing or shear (not shown) may be used.
所定の形状寸法を有する線材８を切断し、第４図に示す
ように、この板材８の端部をコイニング加工用下ダイ９
ｂ上にｇｔする。コイニング加工用上、下ダイ９ａ、９
ｂを閉じて、板材８の一端の所建位１゛啄にコイニング
刀ロエヲ梱す。このようにコイニング刀ｎ工部８ａを形
成することにより、次のロール曲げりロエ時に板材８が
曲がり易くなり、また浴法時の開先にもなるという利点
がある。A wire material 8 having a predetermined shape and dimensions is cut, and the end of this plate material 8 is passed through a lower coining die 9 as shown in FIG.
GT on b. Upper and lower dies 9a, 9 for coining processing
Close b, and pack the coining sword Roewo in the position of one end of the board 8. By forming the coining cut portion 8a in this manner, there is an advantage that the plate material 8 becomes easier to bend during the next roll bending process, and also serves as a bevel during the bath method.
上記コイニング加工した板材８の他端８ｂ側を、第５図
に示すように、１本の上ロール１ｏと２本の下ロール１
１とからなる３本ロールの上、下ロール１０．１１の間
に挿入し、矢印方向に４重を負荷してｌｔ７？面形状が
円形になるようにロール曲げ刀ｌ工を行なう。As shown in FIG.
Insert between the upper and lower rolls 10 and 11 of the three rolls consisting of 1 and 1, and apply a quadruple load in the direction of the arrow. Perform roll bending so that the surface shape becomes circular.
このロール曲げ刀ロエを終了した板材８の他端８ｂと前
記コイニングガロ工部８ａとを突合せ、電子溶接、プ、
ラズマ浴硬、その池などの手段によって接合しく５は溶
接部）、第６図に示すように、その内部に中空部６を有
する中空管体部１２Ｃと、出口部１２ｂとを有するノズ
ル翼予備成形品１２ケ形成する。このように中空管体部
１２Ｃの所間形状を円形にしたため、前記ロール曲げ□
ロエが容易になるのみならず、次の中受ノズル翼の成形
時における液体シール構造が簡単になるという利点があ
る。The other end 8b of the plate material 8 which has been finished with the roll bending blade and the coining galley work part 8a are butted together, and then electronic welding is performed.
As shown in FIG. 6, the nozzle blade has a hollow tube portion 12C having a hollow portion 6 therein and an outlet portion 12b. Form 12 preforms. Since the hollow tube body portion 12C has a circular shape in this way, the roll bending □
This has the advantage that not only is it easier to roe, but also that the liquid seal structure during the next molding of the intermediate receiving nozzle blade is simplified.
次に、前記ノズル買手・薦成形品１２を、型閉めしたと
き中空ノズル翼の完成品とｌ−ｆぼ同一形状に造形され
る空隙を設けたノズル翼成形用上、下ダイ１３ａ、１３
ｂ内に挿入する。Next, the nozzle buyer/recommended molded product 12 is molded into upper and lower dies 13a and 13 for molding nozzle blades provided with a gap so that when the mold is closed, the shape is approximately the same as the finished product of the hollow nozzle blade.
Insert into b.
そしてノズル翼予備成形品１２の中空管体部の内部に油
、その他などの圧力媒体１４を入れ、液圧を訓えながら
前記ノズル翼成形用上、下ダイ１３ａ、１３ｂを型−め
して、前記ノズル翼予備成形品１２に管軸と垂直方向の
何重を負荷することにより扁平に押しつぶし、°その内
部が中空（６は中空部）で、入口部１２ａと出口部１２
ｂとをＭする中空ノズル翼２Ｂを成形する。Then, a pressure medium 14 such as oil or the like is put into the hollow tube part of the nozzle blade preform 12, and the upper and lower dies 13a and 13b for forming the nozzle blade are molded while learning the hydraulic pressure. , the nozzle blade preform 12 is crushed into a flat shape by applying several loads in a direction perpendicular to the tube axis, so that the inside thereof is hollow (6 is a hollow part), and an inlet part 12a and an outlet part 12 are formed.
A hollow nozzle blade 2B with M and b is molded.
次に、型開きしてこの成形品（すなわち中空ノズル翼２
Ｂ）を取出し、最後に、入口部１２ａ近傍のみ仕上げ刀
ロエすることにより、所望の寸法公差に収まる輪郭積度
を有する高精度の中空ノズルＡを製造することができる
。Next, the mold is opened and this molded product (i.e. the hollow nozzle blade 2
B) is removed, and finally, by finishing only the vicinity of the inlet portion 12a, it is possible to manufacture a highly accurate hollow nozzle A having a contour area within a desired dimensional tolerance.
以上説明した本笑肩例によれば、浴接を前工程としてい
るために、溶接（熱）変形の最終形状へ影響は皆無であ
り、ノズル＾成形用上、下ダイ１３ａ、１３ｂによる成
形後には、入口部１２ａ近傍のみ仕上げ加工すればよく
、高精度の中空ノズル翼を安順に製造することができる
。According to the above-mentioned example, since bath welding is a pre-process, there is no effect on the final shape of welding (thermal) deformation, and after forming by the nozzle upper and lower forming dies 13a and 13b. In this case, only the vicinity of the inlet portion 12a needs to be finished, and a high-precision hollow nozzle blade can be manufactured in a safe manner.
以上詳、熊に説明したように本発明によれば、−そ−の
内部が中空で、入口部と出口部とを有する中空ノズル翼
の製造法において、一端をコイニング刃口工した板材を
曲げカｌ工し、この板材の他端と前記コイニング加工部
とを接合することにより、予め中空管体部と出口部とを
有するノズル義子ｖＭ成形品を形成したのち、このノズ
ル真予備成形品を。As explained in detail above, according to the present invention, in the method of manufacturing a hollow nozzle blade which is hollow inside and has an inlet part and an outlet part, a plate material having a coining edge at one end is bent. After forming a nozzle Yoshiko vM molded product having a hollow tube body part and an outlet part in advance by joining the other end of this plate material and the coining part, this nozzle true preformed product is of.
型閉めしたときに前記中空ノズルＡの完成品とはぼ凹−
形状に造形される空隙を設けたノズル翼成形用上、下グ
イ内に挿入し％前記中空営坏部の中空部に液圧をガロえ
ながら前記ノズル翼成形用上。When the mold is closed, the finished product of the hollow nozzle A has a concave shape.
The upper nozzle for forming the airfoil is inserted into the upper and lower guides with a gap formed into the shape, and the upper nozzle for forming the airfoil is applied while applying liquid pressure to the hollow part of the hollow fitting part.
下ダイを型閉めして、前記ノズル真予備成形品に管軸と
垂直方向の直重を負荷することにより、中空ノズル翼を
成形するようにしたので、高精度の中壁ノズル翼を安価
に製造することができる中空ノズル翼の製造方法全提供
することができる。By closing the lower die and applying a direct weight perpendicular to the tube axis to the nozzle true preform, a hollow nozzle blade is formed, making it possible to manufacture high-precision mid-wall nozzle blades at low cost. All methods of manufacturing hollow nozzle blades that can be manufactured can be provided.
第１図は、従来の中実ノズル翼を示す斜視図。
第２図は、従来の中受ノズル４の一列勿示す断面図、第
３図は、従来の中空ノズル減の他の例を示す断面図、第
４図〜第７図は、本−Ａ明の一実施列に泳る中空ノズル
真の製造法を説明するための図でｌ）、第４図は、板材
の−！４をコイニング加工している状態を示す断面図、
第５図は、第４図に床るコイニング刀ロエを果桶したの
ち板材を、曲げ加工している状態を示す断面図、第６図
は、第５図に降る曲げ加工を芙帽したのちの板材の他端
と、前記コイニング９１１部とを浴接してなるノズル翼
予・備成形品を示すｄ＠ｉ図、＄７図は、第６図に係る
ノズル買手Ｊ４成形品をノズル貞成形用上、下ダイ内に
挿入し、型閉めして、中受ノズル翼を成形している状態
を示す演囲図である。
２Ｂ・・・中空ノズル翼、５・・・溶接部、６・・・中
空部、８・・・板材、８ａ・・・板材のコイニング加工
部、８ｂ・・・板材の他部、１２・・・ノズル買手・し
ｍ成形品、１２ａ・・・入口部、１２ｂ・・・出口部、
１２Ｃ・・・中空管体部、１３ａ・・・ノズル４成形用
土ダイ、１３ｂ・・・ノズル５ ５
第４．２
草５目
８久
Ｔ ↑FIG. 1 is a perspective view showing a conventional solid nozzle blade. FIG. 2 is a sectional view showing one row of conventional intermediate receiving nozzles 4, FIG. 3 is a sectional view showing another example of conventional hollow nozzle reduction, and FIGS. Figure 4 is a diagram for explaining the manufacturing method of a hollow nozzle that swims in one row. A cross-sectional view showing a state in which 4 is being coined,
Figure 5 is a cross-sectional view showing the state in which the plate material is bent after the coining knife Roe shown in Figure 4 is bent, and Figure 6 is a cross-sectional view showing the bending process shown in Figure 5. Figure d@i, $7 shows a nozzle blade pre-formed product formed by bath-welding the other end of the plate material with the coining 911, and the nozzle blade J4 molded product according to FIG. FIG. 6 is a diagram illustrating a state in which a middle receiver nozzle blade is formed by inserting the middle receiving nozzle blade into the lower die and closing the die. 2B... Hollow nozzle blade, 5... Welded part, 6... Hollow part, 8... Plate material, 8a... Coining part of plate material, 8b... Other part of plate material, 12...・Nozzle buyer・m molded product, 12a...inlet part, 12b... outlet part,
12C...Hollow pipe body part, 13a...Nozzle 4 molding soil die, 13b...Nozzle 5 5 4.2 Grass 5 eyes 8 kyu T ↑
Claims (1)
ノズル翼の製造法において、一端をコイニング加工した
板材を曲げ〃ａ工し、この板材の他端と前記コイニング
加工部とを接合することにより、予め中空Ｕ体部と出口
部とを有するノズル翼予備成形品を形成したのち、この
ノズル貞↑備成形品を、型閉めしたときに前記中空ノズ
ル翼の完成品とほぼ同一形状に造形される空隙を設けた
ノズル翼成形用上、下ダイ内に挿入し、前記中空管体部
の中空部に液圧をカロえながら前記ノズル買成形用上、
Ｆダイを型閉めして、前記ノズル翼予備成形品に管軸と
世１ハ万同の荷重を負荷することにより、中受ノズル翼
を成形することを特徴とする中空ノズル＾の製造法。1. In a method for manufacturing a hollow nozzle blade that is hollow inside and has an inlet and an outlet, a plate material whose one end has been coined is bent, and the other end of this plate material is joined to the coined part. By doing this, after forming a nozzle blade preformed product having a hollow U-body portion and an outlet portion in advance, this nozzle-prepared molded product has almost the same shape as the completed hollow nozzle blade when the mold is closed. The upper and lower nozzle blades are inserted into the upper and lower dies for forming the nozzle blades, and while applying liquid pressure to the hollow part of the hollow tube body, the nozzle is inserted into the upper and lower dies for forming the nozzle blade.
A method for manufacturing a hollow nozzle, comprising: closing an F-die and applying a load equal to the tube axis to the nozzle blade preform to form a mid-receiving nozzle blade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17008181A JPS5870934A (en) | 1981-10-26 | 1981-10-26 | Manufacture of hollow nozzle blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17008181A JPS5870934A (en) | 1981-10-26 | 1981-10-26 | Manufacture of hollow nozzle blade |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5870934A true JPS5870934A (en) | 1983-04-27 |
| JPS6411380B2 JPS6411380B2 (en) | 1989-02-23 |
Family
ID=15898282
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17008181A Granted JPS5870934A (en) | 1981-10-26 | 1981-10-26 | Manufacture of hollow nozzle blade |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5870934A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001349297A (en) * | 2000-06-06 | 2001-12-21 | Fuji Industrial Co Ltd | Turbofan for range hood, and range hood containing the turbofan |
| KR100493592B1 (en) * | 1998-04-11 | 2005-08-31 | 삼성테크윈 주식회사 | Manufacturing method of cooling vane deflector |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4733025U (en) * | 1971-05-07 | 1972-12-13 | ||
| JPS5410268A (en) * | 1977-06-24 | 1979-01-25 | Nippon Musical Instruments Mfg | Method of making cylindrical member |
-
1981
- 1981-10-26 JP JP17008181A patent/JPS5870934A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4733025U (en) * | 1971-05-07 | 1972-12-13 | ||
| JPS5410268A (en) * | 1977-06-24 | 1979-01-25 | Nippon Musical Instruments Mfg | Method of making cylindrical member |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100493592B1 (en) * | 1998-04-11 | 2005-08-31 | 삼성테크윈 주식회사 | Manufacturing method of cooling vane deflector |
| JP2001349297A (en) * | 2000-06-06 | 2001-12-21 | Fuji Industrial Co Ltd | Turbofan for range hood, and range hood containing the turbofan |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6411380B2 (en) | 1989-02-23 |
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