JPS5932210B2 - Manufacturing method of U-tube - Google Patents
Manufacturing method of U-tubeInfo
- Publication number
- JPS5932210B2 JPS5932210B2 JP8837280A JP8837280A JPS5932210B2 JP S5932210 B2 JPS5932210 B2 JP S5932210B2 JP 8837280 A JP8837280 A JP 8837280A JP 8837280 A JP8837280 A JP 8837280A JP S5932210 B2 JPS5932210 B2 JP S5932210B2
- Authority
- JP
- Japan
- Prior art keywords
- tube
- bent
- bending
- diameter
- press device
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
- F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
- F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
- F28D1/047—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag
- F28D1/0475—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag the conduits having a single U-bend
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Description
【発明の詳細な説明】
この発明はボイラチューブ等に使用されるＵチューブを
曲げ加工によつて製造する方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 U-tube used for a boiler tube or the like by bending.
Ｕチューブを曲げ加工によつて製造する場合、従来では
チューブ直径１．５倍以上の曲げ中心線半径とした。When a U-tube is manufactured by bending, the radius of the bending center line has conventionally been 1.5 times or more the tube diameter.
即ち、これ以下で曲げ加工を行うと引張力が作用する曲
げ外側部分が破断したり、破断しないまでも極めて薄肉
化するという問題があつたからである。従つて、特にボ
イラーチューブの如き、高温、高圧流体を通すチューブ
では、その最小曲げ半径（中心線半径）をチューブ直径
の３倍以上としなければ充分な強度を確保できず、ボイ
ラー自体が大型化することとなつていた。この発明は上
記の点に鑑み、長年に亘る研究の結果完成したもので、
チューブの曲げ外側となる長さに要する長さを曲げる前
の直線のチューブに偏心状の膨出部として予め確保して
おき、この膨出部の膨出側が曲げ外側となるようにＵ曲
げすることにより曲げ中心線半径がチューブ直径の１．
５倍以下（チューブ直径の０．５倍も可能）でありなが
ら曲げ部の真円度が高くしかも曲げ外側部分が破断ある
いは薄肉化することのないＵチューブの製造方法を提供
することを目的としている。以下、この発明の一実施例
を図面にもとずいて説明する。まず、第１図示の如く、
偏心ダイス１により大径のチューブＡを、中間の一部分
を除いて片絞り加工（冷間引抜き）して所望径のチュー
ブＢを得る。That is, if the bending process is performed below this value, there is a problem that the outer part of the bend where the tensile force is applied may break, or even if it does not break, the wall becomes extremely thin. Therefore, especially for tubes such as boiler tubes that carry high-temperature, high-pressure fluids, the minimum bending radius (centerline radius) must be at least three times the tube diameter to ensure sufficient strength, and the boiler itself becomes larger. It was customary to do so. In view of the above points, this invention was completed as a result of many years of research.
The length required for the outside of the tube to be bent is secured in advance as an eccentric bulge on the straight tube before bending, and the tube is U-bent so that the bulge side of this bulge becomes the outside of the bend. This allows the bending centerline radius to be 1.
The purpose of the present invention is to provide a method for manufacturing a U-tube that is less than 5 times the diameter of the tube (0.5 times the tube diameter is also possible), has a high degree of roundness at the bent part, and does not cause breakage or thinning of the outside part of the bend. There is. An embodiment of the present invention will be described below with reference to the drawings. First, as shown in the first diagram,
A large-diameter tube A is single-drawn (cold-drawn) using an eccentric die 1 except for a portion in the middle to obtain a tube B of a desired diameter.
ここに使用する偏心ダイス１は大径の入口側２と小径の
出口側３との両径の下部が同一レベルになる如き偏心量
ｌになつているもので、この偏心ダイス１を通した大径
のチューブＡはその上半部のみが絞り込まれる格好とな
る。この結果、所望径に絞られたチューブＢの中間部分
には非絞り部Ｃが大径のチューブＡの外形をそのまま維
持しながら偏心状の膨出部として残される（第２図、第
３図参照）。なお、上記は偏心ダイス１を用いた片絞り
加工により偏心状の膨出部をチューブＢの中間部分に残
す手段を示しているが、同心ダイス（図示せず）を用い
て一たんチューブＢの中間部分に同心状の膨出部を形成
した後、該膨出部を偏心状に加工によつて加工するよう
にしても上記と同様の結果が得られる。The eccentric die 1 used here has an eccentricity l such that the lower portions of both the large-diameter inlet side 2 and the small-diameter outlet side 3 are at the same level. Only the upper half of the diameter tube A is narrowed down. As a result, a non-squeezed portion C is left as an eccentric bulge in the middle portion of the tube B that has been squeezed to the desired diameter while maintaining the external shape of the large diameter tube A (Figs. 2 and 3). reference). Note that the above shows a method of leaving an eccentric bulge in the middle part of the tube B by one-sided drawing using the eccentric die 1, but once the tube B is drawn using a concentric die (not shown), The same result as described above can be obtained by forming a concentric bulge in the intermediate portion and then machining the bulge into an eccentric shape.
次いで、前記偏心状に膨出した非絞り部Ｃを、その膨出
方向（第３図において縦軸方向）が長軸となる楕円に変
形する。Next, the eccentrically bulging non-squeezed portion C is deformed into an ellipse whose major axis is the bulging direction (vertical axis direction in FIG. 3).
この変形加工は第４図示の如きプレス装置４を用いて行
われる。このプレス装置４は支持台５上に水平方向にス
ライドする横ダイス６、６’を設けたもので、該横ダイ
ス６、６’は図示していない油圧機構により、駆動され
るようになつている。前記プレス装置４により非絞り部
Ｃを楕円に変形加工したならば、チユーブＢを第５図に
示すプレス装置７に後記するようにセツトする。This deformation process is performed using a press device 4 as shown in the fourth figure. This press device 4 is equipped with horizontal dies 6, 6' that slide horizontally on a support base 5, and the lateral dies 6, 6' are driven by a hydraulic mechanism (not shown). There is. After the undrawn portion C has been deformed into an ellipse by the press device 4, the tube B is set in the press device 7 shown in FIG. 5 as described later.
このプレス装置７は下型８と上型９とからなり、下型８
は支持台１０にピン１１，１Ｖを介して回動自在に保持
された二つの回動台１２，１２′を先端が突き合う如く
並設したもので該回動台１２，１２′の上面には前記チ
ユーブＢがその非絞り部Ｃを下向きに載置できる凹状成
形部１３，１３１が設けられている。この凹状成形部１
３，１３′に載せたチユーブＢは、その非絞り部Ｃの中
心点Ｐと回動台１２，１２′の先端の突き合せ点Ｐ′と
が一致するようになつていることはいうまでもない。ま
た、前記プレス装置７の上型９は下向きに夾角９０、（
必ずしも９０７でなくともよい）の成形面を有し、該成
形面にはチユーブＢの外径に一致する凹状成形部１４が
設けられている。しかも、この上型９の先端どなる凹状
成形部１４の曲率半径Ｒ１は最終製品たるＵチユーブＤ
（第１１図参照）の曲げ部Ｅの内径Ｒのほぼ２倍に設計
することが望ましいが、これに限定する趣旨ではない。
この上型９の中心線９″と下型８の回動台１２，１２′
の先端の突き合せ点Ｐ′８ま一致していなければならな
いことは勿論である。従つて、下型８の回動台１２，１
２′の上面の凹状成形部１３，１３′にチユーブＢをそ
の非絞り部Ｃが下向きになるようセツトし、上型９を下
向きに駆動すれば、チユーブＢはその非絞り部Ｃの直線
側の中心に上型９の凹状成形部１４の先端が当接し、該
当接部が内側となつて曲り始める。これに伴つて下型８
の二つの回動台１２，１２′はピン１１，１Ｖを中心軸
として回動しチユーブＢは上型９の凹状成形部１４に溢
つて夾角９０ブに曲げられる。（第６図参照）。このプ
レス装置７を用いて曲げ加工するときは、その加工中チ
ユーブＢは下型８の回動台１２，１２′の上面の凹伏成
形部１３，１３１に嵌合した状態にて曲げられるため、
曲げ部以外に無理な押圧力がかからないばかりでなく下
型８のピン１１１Ｖの位置の選択によつて曲げの中心軸
（中立軸ともいう）がチユーブＢの曲げ外側寄りになる
よう拘束することが可能なため、曲げ過程において曲げ
外側部分となる非絞り部Ｃは必要以上に伸ばされること
なく曲げられ、該部分を薄肉化させることがない。上述
の如く第１段階で夾角９００に曲げられたチユーブＢは
第二段階で夾角９０にに曲げられる。This press device 7 consists of a lower mold 8 and an upper mold 9.
The two rotating tables 12 and 12' are rotatably held on a support stand 10 via pins 11 and 1V, and are arranged side by side so that their tips abut against each other. is provided with concave molded parts 13, 131 on which the tube B can be placed with its non-drawn part C facing downward. This concave molded part 1
It goes without saying that the tube B placed on the tubes 3 and 13' is designed so that the center point P of its non-drawn portion C and the abutting point P' of the tips of the rotating tables 12 and 12' coincide. do not have. Further, the upper die 9 of the press device 7 has a downwardly included angle 90, (
907), and a concave molded portion 14 that matches the outer diameter of the tube B is provided on the molded surface. Moreover, the radius of curvature R1 of the concave molded portion 14 at the tip of the upper die 9 is the U-tube D of the final product.
Although it is desirable to design the inner diameter R to be approximately twice the inner diameter R of the bent portion E (see FIG. 11), this is not intended to limit the design.
The center line 9'' of the upper mold 9 and the rotating bases 12, 12' of the lower mold 8
It goes without saying that the abutment point P'8 of the tips of the two must match. Therefore, the rotating table 12,1 of the lower die 8
If tube B is set in the concave molded parts 13, 13' on the upper surface of 2' so that its non-drawn part C faces downward, and the upper mold 9 is driven downward, tube B will be placed on the straight side of its non-drawn part C. The tip of the concave molding part 14 of the upper die 9 comes into contact with the center of the mold, and the contact part turns inward and begins to bend. Along with this, the lower mold 8
The two rotating tables 12, 12' rotate about the pins 11, 1V as central axes, and the tube B overflows the concave molding part 14 of the upper mold 9 and is bent to an included angle of 90. (See Figure 6). When bending is performed using this press device 7, the tube B is bent while being fitted into the concave forming portions 13, 131 on the upper surface of the rotating base 12, 12' of the lower mold 8. ,
Not only does no unreasonable pressing force be applied to areas other than the bent part, but by selecting the position of the pin 111V of the lower mold 8, the central axis of bending (also called the neutral axis) can be restrained to be closer to the outside of the bending of tube B. Therefore, in the bending process, the non-drawn portion C, which is the outside portion of the bend, is bent without being stretched more than necessary, and the portion is not thinned. As described above, the tube B bent to an included angle of 900 in the first stage is bent to an included angle of 90 in the second stage.
この曲げは前記第一段階の曲げに使用したプレス装置７
と同構造のプレス装置（図示せず）を利用して行うが、
上型９の成形面は夾角３０）になつているとともに、先
端となる凹状５成形部１４の曲率半径Ｒ２は最終製品た
るＵチユーブＤの曲げ部Ｅの内径Ｒに一致するよう設計
されている。第７図は、チユーブＢが夾角３００に曲げ
られた場合を上型９とともに示している。夾角３００に
曲げられたチユーブＢは最終段階でＵ状にされる。This bending is performed using the press device 7 used for the first stage bending.
This is done using a press device (not shown) with the same structure as
The molding surface of the upper die 9 has an included angle of 30), and the radius of curvature R2 of the concave molded portion 14 serving as the tip is designed to match the inner diameter R of the bent portion E of the U-tube D, which is the final product. . FIG. 7 shows a case where the tube B is bent to an included angle 300 together with the upper die 9. The tube B bent to an included angle of 300 is made into a U shape in the final stage.
この最終段階の曲げは第８図の如きプレス装置１５を使
用して行う。即ち、該プレス装置１５は案内枠１６，１
６′間に水平力向にスライドできるように設けた横ダイ
ス１７，１７′と中間固定ダイス１８とからなる。この
中間固定ダイス１８は最終製品たるＵチユーブＤの曲り
部Ｅの中心線半径Ｒ３がチユーブ直径の０．５倍つまり
、直管部分の内側同士が接するようにするときは不要と
なることはいうまでもない。前記横ダイス１７，１７！
はその一端部内面が弧状に突出され、最も内力にスライ
ドさせて互に突き合わせると一端部内縁は半円形になる
とともに直線部内面から一端部内面に亘つてチユーブＢ
が嵌合する凹状成形部１９，１９′が形成されている。
これと同様に中間固定ダイス１８の外周にもチユーブＢ
が嵌合する凹状成形部２０が形成されている。従つて、
第８図示のように夾角３０さに曲げられたチユーブＢを
セツトし、横ダイス１７，１７′を内力に向けて駆動す
れば、チユーブＢは第９図示の如くＵ状に曲げられる。
なお、上記横ダイス１７，１７７の凹状成形部１９，１
９７と中間固定ダイス１８の凹状成形部２０とが形成す
る空間は直線部で真円弧状部で横楕円になるように設計
され、従つて、これによつてＵ状にされたチユーブＢは
第９図示の如く直管部で真円、曲り部で横楕円となる。This final stage of bending is performed using a press device 15 as shown in FIG. That is, the press device 15 has guide frames 16,1
It consists of horizontal dies 17, 17' which are provided so as to be slidable in the horizontal force direction between 6' and an intermediate fixed die 18. This intermediate fixed die 18 is unnecessary when the centerline radius R3 of the bent part E of the final product U-tube D is 0.5 times the tube diameter, that is, when the insides of the straight pipe parts are in contact with each other. Not even. Said horizontal dice 17, 17!
The inner surface of one end of the tube B is protruded in an arc shape, and when they are slid to the innermost force and brought into contact with each other, the inner edge of the one end becomes a semicircle, and from the inner surface of the straight part to the inner surface of one end, the tube B
Concave molded portions 19, 19' into which are fitted are formed.
Similarly, there is a tube B on the outer periphery of the intermediate fixed die 18.
A concave molded portion 20 is formed into which the molded portion 20 is fitted. Therefore,
By setting the tube B bent to an included angle of 30 as shown in FIG. 8 and driving the horizontal dies 17 and 17' toward the internal force, the tube B is bent into a U shape as shown in FIG.
Note that the concave molding portions 19, 1 of the horizontal dies 17, 177
97 and the concave molded part 20 of the intermediate fixed die 18 is designed so that the straight part and the perfectly circular arc part form a horizontal ellipse. 9 As shown in Figure 9, the straight pipe part is a perfect circle, and the curved part is a horizontal ellipse.
最後に、上述の如くＵ状にされたチユーブＢは第１０図
の如きスタンプ装置２１により曲がり部が真円に整形さ
れる。Finally, the tube B, which has been made into a U-shape as described above, is shaped into a perfect circle at the bent portion by a stamping device 21 as shown in FIG.
かくして第１１図示の如き曲り部Ｅの曲げの中心線半径
Ｒ３がチユーブ直径Ｇの１．５倍以下のＵチユーブＤと
して得られる。この発明は以上のように、大径のチユー
ブＡを、その中間の一部分を除いて絞り加工をすること
によつて所望径のチユーブＢを得、その絞り過程あるい
は絞り後の加工によつて所望径のチユーブＢの中間部分
に残された非膨出部Ｃを偏心状になし、該非絞り部をそ
の膨出力向が長軸となる楕円に変形した後に前記非絞り
部Ｃの膨出側が外側となるよう（乙Ｕ曲げすることを特
徴とするものであるから、曲げる前のチユーブＢには曲
げ外側部分の長さに要する長さの膨出部が形成され、Ｕ
曲げに当り、その膨出部が自然な状態でその曲げ外側に
溢うこととなる。従つて、曲げ過程において曲げ外側に
引張力が作用せず、伸ばされることがないので、チユー
ブ直径の１．５倍以下（極端にはチユーブ直径の０．５
倍）の曲げ中心線半径のＵチユーブが曲げ外側部分にお
いて破断したり範肉化することなく得られることとなる
。また、本法により得たＵチユーブをボイラーチユーブ
として適用するときは、嵩張らないためボイラー自体の
小型化に寄与できるなどすぐれた効果を奏するものであ
る。なお、前述した曲げの最終段階にて使用するプレス
装置１５の横ダイス１７，１７′の突き合せ部２２に第
１２図示のように凹状成形部１９，１９′に連続する縦
溝２３，２３′を設けておくときは、チユーブＢがＵ状
になる過程で、その曲げ外側部分の一部が前記縦溝２３
，２３′にて形成された円筒部分を溢上し、突起Ｆを形
成することとなる。このことから、本法は、パイファー
ゲートチューブの製造にも容易に応用することが可能と
なるものである。In this way, a U-tube D is obtained in which the bending center line radius R3 of the bent portion E as shown in FIG. 11 is less than 1.5 times the tube diameter G. As described above, this invention obtains a tube B of a desired diameter by drawing a large diameter tube A except for a part in the middle thereof, and obtains a desired diameter tube B by the drawing process or processing after drawing. The non-squeezed part C left in the middle part of the diameter tube B is made eccentric, and after deforming the non-squeezed part into an ellipse whose major axis is the direction of the swelling force, the swollen side of the non-squeezed part C is on the outside. (Since tube B is characterized by bending U, a bulge with a length required for the length of the outer bent portion is formed on tube B before bending, and U
Upon bending, the bulge naturally overflows to the outside of the bend. Therefore, during the bending process, no tensile force is applied to the outside of the bend, and it is not stretched, so the bending force is less than 1.5 times the tube diameter (in extreme cases, it is 0.5 times the tube diameter).
This means that a U-tube with a bending center line radius of 1.2 times) can be obtained without breaking or thickening at the outer bending portion. Further, when the U-tube obtained by this method is applied as a boiler tube, it has excellent effects such as contributing to miniaturization of the boiler itself because it is not bulky. In addition, as shown in FIG. 12, vertical grooves 23, 23' are formed in the abutting parts 22 of the horizontal dies 17, 17' of the press device 15 used in the final stage of bending, which are continuous with the concave molded parts 19, 19'. When the tube B is formed into a U-shape, a part of the bent outer part of the tube B is formed into the vertical groove 23.
, 23', to form a protrusion F. From this, the present method can be easily applied to the production of Pifergate tubes.
第１図は偏心ダイスを通して所望径のチユーブを得る過
程を示す断面図、第２図は非絞り部を示すチユーブの斜
視図、第３図は非絞り部とチユーブとの関係を示す側面
断面図、第４図は非絞り部を楕円にする装置の正面図、
第５図はチユーブを夾角９００に曲げるプレス装置の正
面図、第６図はチユーブを夾角９０レに曲げた場合の正
面図、第７図はチユーブを夾角３０げに曲げた場合の正
面図、第８図はチユーブをＵに曲げるプレス装置の正面
図、第９図はＵに曲げた場合の正面図、第１０図はスタ
ンプ装置の斜視図、第１１図は最終製品の正面図、第１
２図はパイファーゲートチューブの製造に応用した例を
示すプレス装置の正面図である。
１・・・・・・偏心ダイス、Ａ・・・・・・大径のチユ
ーブ、Ｂ・・・・・・所望径のチユーブ、Ｃ・・・・・
・非絞り部、Ｄ・・・・・・最終製品たるＵチユーブ、
Ｅ・・・・・・曲り部。Fig. 1 is a sectional view showing the process of obtaining a tube with a desired diameter through an eccentric die, Fig. 2 is a perspective view of the tube showing the non-drawn portion, and Fig. 3 is a side sectional view showing the relationship between the non-drawn portion and the tube. , Figure 4 is a front view of the device that makes the non-drawn part elliptical.
Fig. 5 is a front view of a press device for bending a tube to an included angle of 900°, Fig. 6 is a front view of the tube bent to an included angle of 90°, Fig. 7 is a front view of the tube bent to an included angle of 30°, Figure 8 is a front view of the press device that bends the tube into a U shape, Figure 9 is a front view when the tube is bent into a U shape, Figure 10 is a perspective view of the stamp device, Figure 11 is a front view of the final product, and Figure 1
FIG. 2 is a front view of a press device showing an example of application to the manufacture of Pifer gate tubes. 1...Eccentric die, A...Large diameter tube, B...Tube of desired diameter, C...
・Undrawn part, D...U tube which is the final product,
E...Bent part.
Claims (1)
工することによつて所望径のチューブを得、その絞り過
程あるいは絞り後の加工によつて所望径のチューブの中
間部分に残された非絞り部を偏心状になし、該非絞り部
を、その膨出方向が長軸となる楕円に変形した後に前記
非絞り部の膨出側が外側となるようにチューブをＵ曲げ
することを特徴とするＵチューブの製造方法。1. Obtain a tube of the desired diameter by drawing a large diameter tube, excluding a part in the middle, and remove the non-residual material left in the middle part of the tube of the desired diameter by the drawing process or the processing after drawing. The tube is characterized by making the constricted part eccentric, and after deforming the non-squeezed part into an ellipse whose major axis is the bulging direction, the tube is U-bent so that the bulging side of the non-squeezed part is on the outside. Method of manufacturing U-tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8837280A JPS5932210B2 (en) | 1980-06-28 | 1980-06-28 | Manufacturing method of U-tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8837280A JPS5932210B2 (en) | 1980-06-28 | 1980-06-28 | Manufacturing method of U-tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5714420A JPS5714420A (en) | 1982-01-25 |
| JPS5932210B2 true JPS5932210B2 (en) | 1984-08-07 |
Family
ID=13940958
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8837280A Expired JPS5932210B2 (en) | 1980-06-28 | 1980-06-28 | Manufacturing method of U-tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5932210B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07266837A (en) * | 1994-03-29 | 1995-10-17 | Horikiri Bane Seisakusho:Kk | Manufacture of hollow stabilizer |
| CN113000652B (en) * | 2021-02-26 | 2023-04-14 | 深圳市富临厨房设备有限公司 | Bending forming device for evaporating pipe of evaporating plate of refrigerator |
-
1980
- 1980-06-28 JP JP8837280A patent/JPS5932210B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5714420A (en) | 1982-01-25 |
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