JPH04140657A - Method and device for inspecting quality of metal carrier - Google Patents
Method and device for inspecting quality of metal carrierInfo
- Publication number
- JPH04140657A JPH04140657A JP2263636A JP26363690A JPH04140657A JP H04140657 A JPH04140657 A JP H04140657A JP 2263636 A JP2263636 A JP 2263636A JP 26363690 A JP26363690 A JP 26363690A JP H04140657 A JPH04140657 A JP H04140657A
- Authority
- JP
- Japan
- Prior art keywords
- carrier
- outer cylinder
- honeycomb body
- container
- honeycomb
- 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.)
- Pending
Links
- 239000002184 metal Substances 0.000 title claims description 18
- 238000000034 method Methods 0.000 title claims description 8
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 9
- 238000003825 pressing Methods 0.000 claims description 9
- 239000000969 carrier Substances 0.000 claims description 8
- 238000007689 inspection Methods 0.000 claims description 7
- 238000005304 joining Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 5
- 238000012360 testing method Methods 0.000 abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 230000015556 catabolic process Effects 0.000 abstract 1
- 230000000087 stabilizing effect Effects 0.000 abstract 1
- 239000011888 foil Substances 0.000 description 8
- 238000005219 brazing Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 230000001066 destructive effect Effects 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
- F01N3/2807—Metal other than sintered metal
- F01N3/281—Metallic honeycomb monoliths made of stacked or rolled sheets, foils or plates
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、ろう付けされて構成されるメタル担体の接合
部か規定通り適性であるかどうかを判定する品質検査法
およびその装置に関するものである。[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a quality inspection method and apparatus for determining whether a joint of a metal carrier formed by brazing is suitable as specified. be.
（従来の技術）
メタル担体は、ステンレス鋼などの耐熱、耐食性を有す
る金属よりなる平箔と、波箔を重ね合せ、これを巻回ま
たは積層してハニカム体をつくり、このハニカム体をス
テンレス鋼などの耐熱、耐食性を有する金属よりなる外
筒に収納、固定して製造される。(Prior art) The metal carrier is made by overlapping a flat foil made of a heat-resistant and corrosion-resistant metal such as stainless steel with a corrugated foil, and then winding or stacking these to create a honeycomb body. It is manufactured by being housed and fixed in an outer cylinder made of heat-resistant and corrosion-resistant metal such as.
前記ハニカム体において、波箔の山、谷のそれぞれの頂
部は平箔に接触されている。また、ハニカム体と外筒も
同様にろう接合されるのが一般的である。In the honeycomb body, the tops of the ridges and valleys of the corrugated foil are in contact with the flat foil. Further, the honeycomb body and the outer cylinder are generally brazed together in the same way.
前述のように、ハニカム体は、平−波箔を巻回あるいは
積層して形成するため、巻き方によっては、あるいは積
層方法によっては両省が非接触となる部分が起る場合が
あるが、このような部分には確実なろう付けができなく
なる。As mentioned above, a honeycomb body is formed by winding or laminating flat wave foils, so depending on the winding method or the lamination method, there may be parts where the two parts are not in contact with each other. It becomes impossible to reliably braze such parts.
自動車のエンジン排ガス系に搭載し、排ガス浄化機能を
適性に果たすためのメタル担体は、ろう付けすべき個所
は確実にろう付けされ、必要強度を保持しているもので
なければならない。そのための検査法として、従来はろ
う付は後の接合部分を担体から切り出し、これを更に樹
脂で固め、切り出し切断部を研磨して接合部を顕微鏡的
に検査する方法や、担体のハニカム部端面に加圧ヘッド
をのせ、担体軸方向に荷重を加えて耐力を検出し必要レ
ベルに達しているかを調べるなどの方法により接合率の
良否を判定している。Metal carriers that are installed in automobile engine exhaust gas systems and are used to properly perform the exhaust gas purification function must be reliably brazed at the parts that need to be brazed and must maintain the required strength. Conventional methods for testing this purpose include cutting out the joint after brazing from the carrier, hardening it with resin, polishing the cut-out part, and microscopically inspecting the joint. The bonding rate is judged by a method such as placing a pressure head on the carrier, applying a load in the axial direction of the carrier, detecting the proof stress, and checking whether it has reached the required level.
（発明が解決すべき課題）
上記従来の方法では、破壊検査であるため全ての製品に
これを実施することは不可能であり、抜取り検査となる
。従ってその結果を適用するのに限界がある。また精度
をあげるために多数のサンプリングをすれば歩留が低下
し、生産性に問題が生じる。(Problems to be Solved by the Invention) In the conventional method described above, since it is a destructive test, it is impossible to perform this on all products, and the test is a sampling test. Therefore, there are limits to the application of the results. Furthermore, if a large number of samples are taken to improve accuracy, the yield will decrease, causing problems in productivity.
さらに、加圧ヘッドを用いる場合には、該ヘッドが金属
等の剛性のあるの材料でつくられているため、ヘッドの
径よりも小さい内側では、接合部変異が検知されないし
、またヘッド外径より外筒側に向うに従って単位長さ当
りの荷重が減少するため、担体全体を公平に検査するこ
とは困難であった。Furthermore, when using a pressure head, since the head is made of a rigid material such as metal, variations in the joint cannot be detected on the inside, which is smaller than the diameter of the head, and the outer diameter of the head Since the load per unit length decreases toward the outer cylinder, it has been difficult to fairly inspect the entire carrier.
本発明は従来のこのような問題点を解消するものであっ
て、担体、特にハニカム体に全体にかつ破壊の起きない
軸方向の荷重を与え、それによって発生するＡＥ倍信号
モニターすることによって、接合部の良否を判定するメ
タル担体の検査法および装置を提供することを目的とす
る。The present invention solves these conventional problems by applying a non-destructive axial load to the entire carrier, especially the honeycomb body, and monitoring the AE multiplied signal generated thereby. The object of the present invention is to provide a metal carrier inspection method and device for determining the quality of joints.
（課題を解決するための手段）
本発明は上記目的を達成するために、以下の構成を要旨
とする。すなわち、
（１）交互に重ね合せた平板−波板の接触部の一部また
は全部を接合してなるハニカム体を外筒に収納固定して
なるメタル担体の品質を検査するにあたり、該担体の外
筒下端を受台に載置させると共に、ハニカム体上部から
の軸方向に一定荷重で加圧し、これによって発生する音
響周波をＡＥセンサーで受信し、これをＡＥ装置にてカ
ウントし、あらかじめ標準担体から定めたＡＥ信信号色
比較することにより、上記担体の接合状況を判定するこ
とを特徴とするメタル担体の品質検査法および、（２）
液体を収容する容器の底部に、メタル担体の外筒を載置
を受台を設置すると共に、該容器側壁にＡＥ装置と連結
したＡＥセンサーを取付け、該容器上方に前記担体のハ
ニカム体を一定荷重で加圧する押圧体を収納した加圧治
具を配置したことを特徴とするメタル担体の品質検査装
置である。(Means for Solving the Problems) In order to achieve the above object, the present invention has the following configuration as a gist. In other words, (1) When inspecting the quality of a metal carrier formed by housing and fixing a honeycomb body formed by joining a part or all of the contact parts of alternately stacked flat plates and corrugated plates in an outer cylinder, The lower end of the outer cylinder is placed on a pedestal, and a constant load is applied in the axial direction from the upper part of the honeycomb body.The acoustic frequency generated by this is received by an AE sensor, counted by an AE device, and set in advance as a standard. A metal carrier quality inspection method, characterized in that the bonding status of the carrier is determined by comparing the colors of AE signals determined from the carrier, and (2)
At the bottom of a container containing liquid, a pedestal is installed to place the outer cylinder of the metal carrier, an AE sensor connected to an AE device is attached to the side wall of the container, and the honeycomb body of the carrier is fixed above the container. This is a quality inspection device for metal carriers, characterized in that a pressing jig containing a pressing body that presses with a load is arranged.
（３）上記加圧治具に収納する押圧体としては圧縮空気
でふくらむ弾性袋を用いることがハニカム体を加圧する
のに好ましい。(3) For pressurizing the honeycomb body, it is preferable to use an elastic bag inflated with compressed air as the press body housed in the press jig.
（作用） 以下に本発明の詳細な説明する。(effect) The present invention will be explained in detail below.
第１図は本発明装置の一例を示す概要図であって、容器
ｌの底部２に受台３を固定し、その上に外筒の下端を載
置して担体４を支持する。担体４は外筒５とハニカム体
６とからなり、両者をろう付け７で接合している。また
ハニカム体６にも上下にろう付は部８がある。担体４の
上部には、加圧治具９を設置し、受台３上に担体１を載
置したとき、該加圧治具９が担体４上端部に密接するよ
うに近接して固定する。加圧治具９の内部には押圧体ｌ
Ｏを収納している。この抑圧体１０は内部圧力で膨脹す
る弾性体、例えばゴム製の袋でつくられ、上部に圧縮空
気導入管１１と接続させ、これより圧縮空気を導入して
膨脹させることによって治具９内面に拘束されながらハ
ニカム体の上端面に密着し、一定の圧力を全面に荷重す
る。この際、加圧治具９は押圧体１０の膨張反力で浮き
上がらないよう、適宜の手段で固定されている。１２は
抑圧体１０上部に設けた圧力計であって、抑圧体内の圧
力を測定する。FIG. 1 is a schematic diagram showing an example of the apparatus of the present invention, in which a pedestal 3 is fixed to the bottom 2 of a container 1, and a carrier 4 is supported by placing the lower end of the outer cylinder on the pedestal 3. The carrier 4 consists of an outer cylinder 5 and a honeycomb body 6, both of which are joined by brazing 7. The honeycomb body 6 also has brazing portions 8 at the top and bottom. A pressure jig 9 is installed on the top of the carrier 4, and when the carrier 1 is placed on the pedestal 3, the pressure jig 9 is fixed in close proximity to the upper end of the carrier 4. . There is a pressing body l inside the pressing jig 9.
It stores O. This suppressor 10 is made of an elastic body, such as a rubber bag, that expands due to internal pressure, and is connected to a compressed air introduction pipe 11 at the upper part, and compressed air is introduced from this and expanded to cause the inner surface of the jig 9 to be filled. While being restrained, it comes into close contact with the upper end surface of the honeycomb body, and a constant pressure is applied to the entire surface. At this time, the pressing jig 9 is fixed by appropriate means so as not to be lifted up by the expansion reaction force of the pressing body 10. 12 is a pressure gauge provided on the upper part of the suppressor 10, and measures the pressure inside the suppressor.
容器１中には水などの液体１３をはり、またその側壁に
は液より伝播するＡＥ傷信号モニタリングするＡＥセン
サ１４を取り付け、ＡＥＥ置１５と連結している。A liquid 13 such as water is filled in the container 1, and an AE sensor 14 for monitoring AE damage signals propagated from the liquid is attached to the side wall of the container 1, and is connected to an AEE station 15.
尚、本発明は容器底部に必要に応じて変位計１６、例え
ばポテンショメーターを設けて、前記ＡＥセンサと併用
することにより判定精度を向上できる。Incidentally, in the present invention, the determination accuracy can be improved by providing a displacement meter 16, for example, a potentiometer, as necessary at the bottom of the container and using it together with the AE sensor.
上述した装置により、担体接合度を判定するには、水を
充填した容器１内の受台に、外筒５エツジを載置して位
置を安定させた後、加圧治具９を外筒５の上端部に下げ
て固定し、ゴム袋１０に圧縮空気を注入してこれを膨張
しハニカム体６の上端より加圧する。この際圧力計１２
を見なからハニカム体６に破壊が起きないように目標圧
力となるように除々に圧力をあけ、目標値になったら注
入を停止する。このような加圧によって、ハニカム体か
らＡＥ傷信号発するが、特に不完全な接合部分からは多
くのＡＥ傷信号発生するこのようなＡＥ傷信号水を介し
てＡＥセンサ１４がモニタリングし、ＡＥＥ置１５に伝
達してここでカウントされる。In order to determine the degree of carrier bonding using the above-mentioned device, the edge of the outer cylinder 5 is placed on the pedestal in the water-filled container 1 to stabilize the position, and then the pressure jig 9 is placed on the outer cylinder. The rubber bag 10 is lowered and fixed to the upper end of the honeycomb body 6, and compressed air is injected into the rubber bag 10 to expand it and pressurize it from the upper end of the honeycomb body 6. At this time, the pressure gauge 12
To avoid damage to the honeycomb body 6, the pressure is gradually increased to the target pressure, and when the target pressure is reached, the injection is stopped. Due to such pressurization, an AE flaw signal is emitted from the honeycomb body, and a large number of AE flaw signals are generated especially from an incomplete joint. 15 and is counted here.
標準担体のＡＥ傷信号、予めいくつかの担体についてＡ
Ｅ傷信号調整し、さらにこれらの担体について、ハニカ
ム接合状況、軸方向加重による押抜は状況等から標準と
すべき担体を選定することによってその範囲を定めるこ
とができる。AE scratch signal of standard carrier, A for some carriers in advance
The range of these carriers can be determined by adjusting the E-flaw signal and selecting a carrier to be the standard based on the honeycomb bonding condition, the punching by axial load, etc.
上記加圧は長時間行う必要はなく、１０〜３０秒間に約
５ ｋｇ／ａｊの加圧を行うことにより、直径１００圓
の担体品質を短時間に判定できる。The above pressurization does not need to be carried out for a long time, and by applying a pressure of about 5 kg/aj for 10 to 30 seconds, the quality of a carrier having a diameter of 100 mm can be determined in a short time.
（実施例）
厚さ５０μｍのステンレス箔の平板とコルゲート加工し
た波板とを重ねて渦巻状に巻回し、ハニカム体を製造し
た。このハニカム体を厚さ２−のステンレス製外筒に装
入し、第３図に示す担体４を構成した。外筒５とハニカ
ム体６のろう接合は、符号７で示し、ハニカム体のろう
接合部は符号８で示している。（なお、図では外筒５と
ハニカム体６との間には、わかりやすくするために間隙
を設けている。）外筒の内径は１００ｍ、従ってハニカ
ム体の外径も１００ｍｍである。(Example) A honeycomb body was manufactured by stacking a 50 μm thick stainless steel foil flat plate and a corrugated corrugated plate and winding them in a spiral shape. This honeycomb body was placed in a stainless steel outer cylinder having a thickness of 2 mm to form a carrier 4 shown in FIG. 3. The solder joint between the outer cylinder 5 and the honeycomb body 6 is designated by 7, and the solder joint of the honeycomb body is designated by 8. (In the figure, a gap is provided between the outer cylinder 5 and the honeycomb body 6 for clarity.) The inner diameter of the outer cylinder is 100 m, and therefore the outer diameter of the honeycomb body is also 100 mm.
この上うな担体を５ケ（Ａ−Ｅ）製造し、それぞれにつ
いて第１図に示す装置により接合部を判定した。すなわ
ちゴム袋に圧縮空気を注入して膨張加圧し圧力が５ ｋ
ｇ／ａ＋ｆになったとき、圧縮空気の注入を中止しこの
圧力で２０秒間保持した。この間に発生したＡＥ信号数
をカウントし、第２図に示した。Five such carriers (A to E) were produced, and the bonded portion of each was determined using the apparatus shown in FIG. In other words, compressed air is injected into a rubber bag and the bag is expanded and pressurized to a pressure of 5 k.
When the pressure reached g/a+f, injection of compressed air was stopped and this pressure was maintained for 20 seconds. The number of AE signals generated during this period was counted and is shown in FIG.
本実験以前に複数の担体についてあらかじめ同様の試験
を行った後、各担体（第３図参照）より第４図に示すよ
うな切り出し片１７を切り出し、これに樹脂被覆した後
切り出し面の接合状態を観察した。なお、接合率は、実
際の接合されている全接合点数／接合すべき波箔と平箔
の全接合点数×１００で求めた。その結果ＡＥ信信号色
実測接合率との関係は第２図の左右縦軸に示すような関
係が得られた。Prior to this experiment, similar tests were conducted on multiple carriers, and after cutting out pieces 17 as shown in Figure 4 from each carrier (see Figure 3) and coating them with resin, the bonded state of the cut surfaces observed. Note that the joining rate was determined by the total number of actual joining points divided by the total number of joining points of corrugated foil and flat foil to be joined x 100. As a result, the relationship between the AE signal color and the measured joining rate was as shown on the left and right vertical axes in FIG.
第２図により、各担体Ａ−Ｅは極めて短時間に接合率の
良否が判定できた。As shown in FIG. 2, it was possible to determine the bonding rate of each carrier A to E in a very short time.
（発明の効果）
以上のように本発明においては、メタル担体を破壊試験
することなく短時間で接合状態を判定できる。しかも、
一部の接合状況を判断するのではなく、の全体を検査で
きるため、極めて信頼性が高くなる。(Effects of the Invention) As described above, in the present invention, the bonding state can be determined in a short time without performing a destructive test on the metal carrier. Moreover,
The reliability is extremely high because the entire joint can be inspected, rather than determining only a part of the joint.
第１図は本発明装置の一例を示す概要図、第２図は本発
明性実施例結果（判定グラフ）を示す図、第３図は一部
を断面した担体斜視図、第４図は担体よりの切り出し部
を示す図である。
１；容 器
３・受 台
５・外 筒
７．８；ろう付け
１０・押圧体
１２；圧力計
１４、ＡＥセンサ
１６；変位計
２；底 部
４；担 体
６；ハニカム体
９；加圧治具
１１、圧縮空気導入管
１３：液 体
１５、ＡＥ装置Fig. 1 is a schematic diagram showing an example of the device of the present invention, Fig. 2 is a diagram showing the results of the inventive example (judgment graph), Fig. 3 is a partially sectional perspective view of the carrier, and Fig. 4 is a diagram of the carrier. It is a figure which shows the cut-out part of a twist. 1; Container 3, pedestal 5, outer cylinder 7.8; Brazing 10, pressing body 12; Pressure gauge 14, AE sensor 16; Displacement gauge 2; Bottom part 4; Carrier 6; Honeycomb body 9; Pressure Jig 11, compressed air introduction pipe 13: liquid 15, AE device
Claims (3)
は全部を接合してなるハニカム体を外筒に収納固定して
なるメタル担体の品質を検査するにあたり、該担体の外
筒下端を受台に載置させると共に、ハニカム体上部から
の軸方向に一定荷重で加圧し、これによって発生する音
響周波をＡＥセンサで受信し、これをＡＥ装置にてカウ
ントし、あらかじめ標準担体から定めたＡＥ信号数と比
較することにより、上記担体の接合状況を判定すること
を特徴とするメタル担体の品質検査法(1) When inspecting the quality of a metal carrier made by housing and fixing a honeycomb body formed by joining some or all of the contact parts of alternately stacked flat plates and corrugated plates in an outer cylinder, the outer cylinder of the carrier is The lower end is placed on a pedestal, and a constant load is applied in the axial direction from the upper part of the honeycomb body.The acoustic frequency generated by this is received by an AE sensor, counted by an AE device, and pre-assembled from a standard carrier. A metal carrier quality inspection method characterized by determining the bonding status of the carrier by comparing it with a predetermined number of AE signals.
を載置する受台を設置すると共に、該容器側壁にＡＥ装
置と連結したＡＥセンサーを取付け、該容器上方に前記
担体のハニカム体を一定荷重で加圧する押圧体を収納し
た加圧治具を配置したことを特徴とするメタル担体の品
質検査装置(2) A pedestal on which the outer cylinder of the metal carrier is placed is installed at the bottom of a container containing liquid, an AE sensor connected to an AE device is attached to the side wall of the container, and a honeycomb of the carrier is installed above the container. A quality inspection device for metal carriers, characterized in that a pressurizing jig containing a pressurizing body for pressurizing the body with a constant load is arranged.
弾性袋であることを特徴とする請求項２記載のメタル担
体の品質検査装置(3) The quality inspection device for metal carriers according to claim 2, wherein the pressing body housed in the pressing jig is an elastic bag inflated with compressed air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2263636A JPH04140657A (en) | 1990-10-01 | 1990-10-01 | Method and device for inspecting quality of metal carrier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2263636A JPH04140657A (en) | 1990-10-01 | 1990-10-01 | Method and device for inspecting quality of metal carrier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04140657A true JPH04140657A (en) | 1992-05-14 |
Family
ID=17392249
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2263636A Pending JPH04140657A (en) | 1990-10-01 | 1990-10-01 | Method and device for inspecting quality of metal carrier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04140657A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013529307A (en) * | 2010-05-27 | 2013-07-18 | テネコ オートモティブ オペレーティング カンパニー インコーポレイテッド | Ultrasonic acoustic radiation to detect substrate defects |
-
1990
- 1990-10-01 JP JP2263636A patent/JPH04140657A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013529307A (en) * | 2010-05-27 | 2013-07-18 | テネコ オートモティブ オペレーティング カンパニー インコーポレイテッド | Ultrasonic acoustic radiation to detect substrate defects |
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