JPH03226318A - Deep drawing method for metallic material - Google Patents
Deep drawing method for metallic materialInfo
- Publication number
- JPH03226318A JPH03226318A JP2021110A JP2111090A JPH03226318A JP H03226318 A JPH03226318 A JP H03226318A JP 2021110 A JP2021110 A JP 2021110A JP 2111090 A JP2111090 A JP 2111090A JP H03226318 A JPH03226318 A JP H03226318A
- Authority
- JP
- Japan
- Prior art keywords
- blank
- deep drawing
- temperature
- recrystallization
- earings
- 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
- 239000007769 metal material Substances 0.000 title claims description 18
- 238000000034 method Methods 0.000 title claims description 17
- 238000001953 recrystallisation Methods 0.000 claims abstract description 20
- 238000002844 melting Methods 0.000 claims description 8
- 230000008018 melting Effects 0.000 claims description 8
- 239000000463 material Substances 0.000 abstract description 24
- 238000010438 heat treatment Methods 0.000 abstract description 7
- 230000002093 peripheral effect Effects 0.000 abstract description 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 210000005069 ears Anatomy 0.000 description 7
- 230000037303 wrinkles Effects 0.000 description 7
- 238000000137 annealing Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 2
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910052582 BN Inorganic materials 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000005639 Lauric acid Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
Ｃ産業上の利用分野１
本発明は、金属材の深絞り加工方法に係わり、特に、絞
り終端部に形成される耳の高さを低減することのできる
、金属材の深絞り加工方法に関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application 1 The present invention relates to a method of deep drawing a metal material, and in particular, to a method for deep drawing a metal material, which can reduce the height of the selvedge formed at the drawing end. The present invention relates to a deep drawing method.
深絞り加工は、周知のとおり、平らな薄板から底付きの
容器を成形する加工法である。この深絞り加工を行うに
は、第１図に示すようにポンチ２とダイス３を用い、成
形すべきブランク （素板）ｌをダイス３上に載せ、製
品の外径よりやや小さい径を有する前記ポンチ２で第２
図に示す如く前記ブランクｌをダイス３のダイス穴４の
中に押し込み、底付きの製品とする。また、前記ブラン
クｌの厚みが薄い場合等には、円周方向に生ずる圧縮応
力により座屈してしわを生ずる。このしわを防止するた
めには、通常、しわ押え５を用い、該しわ押え５と前記
ダイス３とでブランクｌを挟むようにする。As is well known, deep drawing is a processing method for forming a container with a bottom from a flat sheet. To perform this deep drawing process, as shown in Fig. 1, a punch 2 and a die 3 are used, and a blank (original plate) to be formed is placed on the die 3. With the punch 2, the second
As shown in the figure, the blank 1 is pushed into the die hole 4 of the die 3 to form a product with a bottom. Further, when the thickness of the blank 1 is thin, it buckles and wrinkles due to compressive stress generated in the circumferential direction. In order to prevent this wrinkle, a wrinkle presser 5 is usually used, and the blank l is sandwiched between the wrinkle presser 5 and the die 3.
ところで、ブランクｌを形成する板材は通常、圧延加工
により製造されているので、どうしてもその性質に方向
性が生じていることがほとんどである。そのため円形の
ブランク１を絞った場合に、容器（深絞り製品）７の上
端縁（絞り終端縁）は−直線とはならずに波打つものと
なる。この現象を ”耳付き（ｅａｒｉｎｇ）’ と言
い、また波打った部分を ”耳”と称している。第３図
に、この耳８の形成状況を示す。By the way, since the plate material forming the blank 1 is usually manufactured by rolling, its properties are almost always directional. Therefore, when the circular blank 1 is squeezed, the upper edge (drawing end edge) of the container (deep-drawn product) 7 is not straight but wavy. This phenomenon is called "earing," and the wavy portion is called "ear." FIG. 3 shows how this ear 8 is formed.
そして、通常は、容器７の上端縁をきれいな直線とする
ため、この耳８の部分は切り落としている。したがって
、この耳８の高さ （突出長）が大きいと、それだけ切
り落とし部分が多くなり、材料の無駄が生じ歩溜りの低
下を招いていた。また場合によっては、高耳のために、
例えば連続加工工程ライン中においてこの耳８を形成し
た容器７がラインを流れなくなったり、あるいは加工機
械にセットされないといった弊害を生ずることもあり、
製造能率に影響を与えることらある。In order to make the upper edge of the container 7 a straight line, the lugs 8 are usually cut off. Therefore, if the height (projection length) of the ears 8 is large, the number of parts to be cut off increases accordingly, leading to waste of material and a decrease in yield. In some cases, due to high ears,
For example, in a continuous processing line, the container 7 with the ears 8 may no longer flow through the line or may not be set in the processing machine.
It may affect manufacturing efficiency.
このような耳８による弊害を解消すべく、従来ては、例
えば下記の如き手段によりこの耳８の低耳化が図られて
いる。In order to eliminate such adverse effects caused by the ears 8, conventionally, the ears 8 have been made lower by, for example, the following means.
すなわち、前記ブランクｌのための板材を製造する際に
、熱間圧延温度のコントロールやスラブの均熱処理、あ
るいは冷間圧延途中の中間焼き鈍しなと、各種の処理材
料に応じた条件で組み合わせて施し、かつこの様な処理
を経て製造された材料からなるブランクＩのフランジ部
１ａ（絞り変形を受ける部分）を常温、またはごく希に
は再結晶温度以下に加熱して深絞り加工を行う、といっ
たことなどである。That is, when manufacturing the plate material for the blank 1, hot rolling temperature control, soaking treatment of the slab, or intermediate annealing during cold rolling are performed in combination under conditions depending on the various processed materials. , and deep drawing is carried out by heating the flange part 1a (the part that undergoes drawing deformation) of the blank I made of the material manufactured through such processing to room temperature, or in very rare cases below the recrystallization temperature. Things like that.
しかしながら、上記従来方法では、ブランク材の製造に
莫大な製造設備投資費と多大な設備運転費を要し、製品
のコスト高を招くといった問題があった。また、この様
な手段によっても前記耳８を低くするには限界があり、
深い容器形状では、歩溜りの悪化や、同じブランクでの
より深い成形が不可能である等の欠点があった。However, the above-mentioned conventional method has a problem in that manufacturing the blank material requires a huge amount of investment in manufacturing equipment and a huge amount of equipment operating cost, leading to an increase in the cost of the product. Furthermore, there is a limit to how low the ears 8 can be made by such means.
Deep container shapes have drawbacks such as poor yield and the inability to form deeper shapes with the same blank.
さらに、上記の如き手段により加工度の高い深絞りをし
た後に、再絞り加工やフランジ加工、ビード加工なとの
再塑性加工を必要とする場合は焼き鈍し処理を必要とし
、費用および納期かかかる欠点があった。Furthermore, after deep drawing with a high degree of processing as described above, if re-plastic processing such as re-drawing, flange processing, bead processing, etc. is required, annealing is required, which increases cost and delivery time. was there.
本発明は上記の事情に鑑みてなされｆ二もので、」−記
、）如き処理を施しｆ二低耳材を用いることなく低耳、
）容器７を加工することがてき、また、再塑性加工を施
す場合でも、焼き鈍し処理を行わずに実雀することので
きる、金属材の深絞り加工方法を実現、提供することを
目的とするものである。The present invention has been made in view of the above circumstances, and has a low selvedge, without using a low selvedge material, by applying the treatment as described in "-").
) It is an object of the present invention to realize and provide a deep drawing method for metal materials, which can process the container 7 and can be used for drawing without annealing even when re-plastic working is performed. It is something.
二課題を解決するための手段〕
請求項１に記載した発明は、金属材の深絞り加工方法で
あって、加工すべきブランクの絞り変形を受ける部分を
、前記ブランクを構成する金属材、）再結晶温度以上か
つ融′点未溝の温度として深絞り加工を行うことを特徴
とするものである。[Means for Solving Two Problems] The invention described in claim 1 is a method for deep drawing a metal material, in which a portion of a blank to be processed that undergoes drawing deformation is a metal material constituting the blank. It is characterized by performing deep drawing at a temperature above the recrystallization temperature and below the melting point.
請求項２に記載した発明は、特に請求項１に記載した発
明を実現する方法であって、加工すべきブランクにおけ
る絞り変形を受ける部分が接する金型面を、前記ブラン
クを構成する金属材の再結晶温度以上かつ融点未満の温
度として深絞り加工を行うことを特徴とするものである
。The invention set forth in claim 2 is a method for realizing the invention set forth in claim 1, in which a mold surface that is in contact with a portion of a blank to be processed that undergoes drawing deformation is made of a metal material constituting the blank. It is characterized by performing deep drawing at a temperature higher than the recrystallization temperature and lower than the melting point.
二作用 コ
ブランクのフランジ部
（絞り変形を受ける部分）
の温度をブランク材の再結晶温度以上の温度（たたし融
点未満）として深絞り加工を行うことにより、各種熱処
理等を施し几低耳材を使用しなくとも製品の低耳化を実
現できる。Dual action By deep drawing the temperature of the flange part of the co-blank (the part that undergoes drawing deformation) to a temperature higher than the recrystallization temperature (lower than the melting point) of the blank material, various heat treatments etc. are applied to create a low-profile material. It is possible to achieve a product with a lower profile without using it.
フランツ部の変形は、一般に材料の集合＃１織に従う変
形を生ずるものとなるが、上記方法によればさらに動的
再結晶も発生する。この動的再結晶は、深絞り加工の円
周方向の圧縮変形度の高い部分、すなわち耳の谷部に優
先的に発生する。そのため、この部分の延性が増加して
耳の谷部深さを減少させるためと考えられる。Although the deformation of the flantz portion generally results in deformation according to the aggregate #1 weave of the material, according to the above method, dynamic recrystallization also occurs. This dynamic recrystallization occurs preferentially in the portion where the degree of compressive deformation in the circumferential direction during deep drawing is high, that is, in the valley of the selvedge. This is considered to be because the ductility of this part increases and the depth of the trough of the ear decreases.
以下、本発明の実施例について詳細に説明する。 Examples of the present invention will be described in detail below.
なお、以下の説明において、各部材名または部位名に付
した符号は、前記第１図ないし第３図に示した符号と対
応させである。In the following description, the reference numerals attached to each member name or part name correspond to the reference numerals shown in FIGS. 1 to 3 above.
本発明は、金属材の深絞り加工を行うに際し、加工すべ
きブランクｌのフランジ部１ａ、すなわち絞り変形を受
ける周辺部分（ポンチ２の先端面に当接する部分を除く
部分）を、該ブランクＩを構成する金属材の再結晶温度
以上かつ融点未満の温度として成形することを特徴とす
るものである前記フランジ部１ａを上記温度範囲に加熱
する手段としては、金型６ （前記ダイス３および前記
しわ押え５）の内部、または金型６のブランク１側表面
に、例えば電気ヒータ等の周知の加熱手段を設けること
により構成される。In the present invention, when deep drawing a metal material, the flange portion 1a of the blank I to be processed, that is, the peripheral portion that undergoes drawing deformation (excluding the portion that abuts the tip surface of the punch 2), is removed from the blank I. As means for heating the flange portion 1a to the above temperature range, the molding is performed at a temperature higher than the recrystallization temperature and lower than the melting point of the metal material constituting the metal material. It is constructed by providing a known heating means, such as an electric heater, inside the wrinkle presser 5) or on the surface of the mold 6 on the blank 1 side.
上記方法により深絞り加工を実施すれば、低耳、すなわ
ち前記具８の極めて小さい容器７を得ることかできる。If deep drawing is carried out by the above method, it is possible to obtain a container 7 with a low profile, that is, an extremely small container 8 of the tool 8.
これは、フランジ部１ａの変形は、そのブランクｌを形
成する材料の集合組織に従う変形を生ずるが、ブランク
Ｉを再結晶温度以上とすることにより動的再結晶も発生
する。この動的再結晶は、深絞り成形の円周方向の圧縮
変形度の高い部分、すなわち耳８を形成する谷８ｂに優
先的に発生し、この谷８ｂの延性が増加してこの部分が
延びて耳８の谷８ｂを減少させ、よって、全体を低耳に
すると考察される。This is because deformation of the flange portion 1a causes deformation according to the texture of the material forming the blank I, but dynamic recrystallization also occurs by raising the temperature of the blank I above the recrystallization temperature. This dynamic recrystallization occurs preferentially in the region of high compressive deformation in the circumferential direction of deep drawing, that is, in the valley 8b forming the ear 8, and the ductility of this valley 8b increases and this region is extended. It is considered that the valley 8b of the ear 8 is reduced, thereby making the entire ear a low ear.
あるいはまた、圧縮変形度の高い部分ずなゎち耳８の谷
８ｂは、この部分の板厚が厚くなることにより板厚の薄
い山８ａよりらダイス３やしわ押え５と大きな圧力で接
触し、この谷８ｂの材料には板厚方向の大きな圧縮応力
が発生ずるとともに、深絞り成形の円周方向の圧縮応力
も生ずるので、谷８ｂ部分の材料はフランジ部１ａの半
径方向に延びるしかなく、再結晶による延性増加が加わ
って耳８の谷８ｂの深さを減少させ、全体を低耳とする
とも考えられる。Alternatively, the valleys 8b of the ears 8, which are areas with a high degree of compressive deformation, come into contact with the die 3 and the wrinkle presser 5 with greater pressure than the peaks 8a of the thinner plate due to the thicker plate thickness in these areas. A large compressive stress is generated in the material of the valley 8b in the plate thickness direction, as well as a compressive stress in the circumferential direction due to deep drawing, so the material of the valley 8b has no choice but to extend in the radial direction of the flange portion 1a. It is also considered that the depth of the valley 8b of the ear 8 is reduced due to the increase in ductility due to recrystallization, resulting in a low ear as a whole.
また、本発明において、ブランク１のフランジ部１ａ以
外の部分（すなわち既に絞り変形を受けた部分等）が熱
伝導により温度上昇することは避けられないが、絞り荷
重負担部分であるポンチ２の頭部層Ｒ部の材料の温度を
低温としたほうが引張り強さが大きくなり、絞り荷重負
担能力が増大し限界絞り比を向上できるので、ポンチ２
の頭部層Ｒ部の材料温度は低温であることが望ましい。Furthermore, in the present invention, although it is unavoidable that parts of the blank 1 other than the flange 1a (i.e., parts that have already undergone drawing deformation) increase in temperature due to heat conduction, the head of the punch 2, which is the part that bears the drawing load, cannot be avoided. Lowering the temperature of the material of the layer R will increase the tensile strength, increase the drawing load bearing capacity, and improve the critical drawing ratio.
It is desirable that the material temperature of the R portion of the head layer is low.
また、本発明において、ブランク１の前記フランジ部１
ａの加熱温度範囲を、ブランクｌを形成する金属材の融
点温度未満とするのは、これを融点以上とした場合、該
フランジ部１ａか金型６に固ｉ？ Ｌ Ｗｙ ＜、連続
加工か不可能と戸ろおそイーがあるためである。Further, in the present invention, the flange portion 1 of the blank 1
The reason why the heating temperature range of a is set to be lower than the melting point temperature of the metal material forming the blank l is because if the heating temperature range is set to be above the melting point, the flange portion 1a or the mold 6 will be hardened. This is because continuous processing is impossible and difficult.
なお、本方法において使用する潤滑剤としては、工業石
鹸の水溶液にＭｏ５ｔ、黒鉛粉末、窒化ホウ累、タルク
粉末、雲母粉末等の無機質粉末を１種まｆ二は２種以上
含ませたものを使用するのが望ましい。The lubricant used in this method is an aqueous solution of industrial soap containing one or more inorganic powders such as Mo5t, graphite powder, boron nitride, talc powder, mica powder, etc. It is preferable to use
Ｓ 実験例 二
′Ｆ：２＋２の実験条件の下で、ブランクｌのフランジ
部１ａの温度をそれぞれ変えて深絞り加工を行った。そ
の実験結果の一部を表に示す。S Experimental Example Under the experimental conditions of 2'F:2+2, deep drawing was performed while varying the temperature of the flange portion 1a of the blank 1. Some of the experimental results are shown in the table.
実験条件
・ブランク材料ニアルミニウム合金板材ＪＩＳ５１８２
−０
・ブランク寸法：８６．８φ ：６６φ（室温）〕厚さ
１．０＋ｎｍ
・ブランクの再結晶温度：３２０℃
・ボレチ寸法、外径３３φ
ポンチ肩４．５Ｒ
尚、ポンチは０°Ｃに冷却
ダイス穴径３５゜４ φ
ダイス肩５Ｒ
００Ｋｇｆ
・絞り速度： １８０ ｍｍ／ｍｉｎ
・潤滑剤・ラウリン酸Ｎａ溶液÷ＭＯ６２塗布・しわれ
押え力
ダイス寸法
表
一例として上記表にも示されるように、ブランク１のフ
ランジＷ＝ Ｉ ａをブランク１を形成する材料の再結
晶温度以上としｊ＝場合には、耳率が２％以下であり、
常温、および再結晶温度未満の温度とした場合に比べて
極めて低いことが解る。Experimental conditions/Blank material Nialuminum alloy plate JIS5182
-0 ・Blank dimensions: 86.8φ : 66φ (room temperature) Thickness 1.0+nm ・Blank recrystallization temperature: 320℃ ・Bore punch dimensions, outer diameter 33φ Punch shoulder 4.5R Note that the punch is cooled to 0℃ Die hole diameter 35゜4 φ Die shoulder 5R 00Kgf ・Drawing speed: 180 mm/min ・Lubricant ・Lauric acid Na solution ÷ MO62 application ・Wrinkling force As shown in the above table as an example of the die dimension table, blank If the flange W=Ia of 1 is above the recrystallization temperature of the material forming blank 1 and j=, the selvage ratio is 2% or less,
It can be seen that the temperature is extremely low compared to normal temperature and the case where the temperature is lower than the recrystallization temperature.
さらに、壁断面強度ら７３度と低く、０材（焼き鈍しに
より最も軟かい状態となったもの）相当である。このこ
とは、上記■の容器（本発明による深絞り製品）は焼き
鈍し処理なしに再絞り等の再塑性加工が可能であること
を示している。Furthermore, the wall cross-sectional strength is as low as 73 degrees, which is equivalent to 0 material (the softest state after annealing). This indicates that the container of (1) above (deep drawn product according to the present invention) can be subjected to re-plastic processing such as re-drawing without annealing.
なお、上記実験例は、ブランクｌの材質をアルミニウム
合金として実施したしのであるが、他の金属材からなる
ブランクＩにおいても上記同様の効果を得ることかでき
る。In addition, although the above experimental example was carried out using an aluminum alloy as the material of the blank I, the same effect as described above can be obtained with the blank I made of other metal materials.
以上説明したとおり本発明によれば、高価な低耳材を用
いることなく深絞り製品の低耳化を実現でき、歩溜りの
向上が図れ、またそれに伴い製品の大幅なコスト低減化
を実現できる。As explained above, according to the present invention, it is possible to reduce the selvage of a deep-drawn product without using expensive low selvage material, improve the yield, and achieve a significant cost reduction of the product accordingly. .
さらに、本発明によれば、絞り部の壁断面硬度の加工効
果も抑制されるので、深絞り製品の再絞り加工、あるい
はフランツ加工、ビート加工等の再塑性加工を焼き鈍し
処理を行うことな〈実施することができ、再塑性加工品
ではさらなるコスト低減を実現できる、等の優れｒ二効
果を奏−ケる。Furthermore, according to the present invention, the processing effect on the wall cross-sectional hardness of the drawn part is also suppressed, so that re-drawing of deep-drawn products or re-plastic processing such as Franz processing or beat processing is not performed by annealing. It is possible to achieve two excellent effects, such as further cost reduction in re-plasticized products.
第１図は一般的な深絞り装置を示す側断面図、第２図は
第１図に示した深絞り装置１こよる架構状態を示す側断
面図、第３図は従来の深絞り製品を示す斜視図てめろ。
ｌ・・・ ブランク、
１ａ・・ フランジ部（絞り変形を受（する所ミ分）３
ダイス、 ５・・・・・しわ押え８ ・・・・
金型。Fig. 1 is a side sectional view showing a general deep drawing device, Fig. 2 is a side sectional view showing a frame structure of the deep drawing device 1 shown in Fig. 1, and Fig. 3 is a side sectional view showing a conventional deep drawing product. Perspective view shown. l... Blank, 1a... Flange part (part that receives (receives) drawing deformation) 3
Dice, 5...Wrinkle presser 8...
Mold.
Claims (2)
ランクの絞り変形を受ける部分を、前記ブランクを構成
する金属材の再結晶温度以上かつ融点未満の温度として
深絞り加工を行うことを特徴とする金属材の深絞り加工
方法。(1) A method for deep drawing a metal material, in which the deep drawing process is performed at a temperature of a portion of a blank to be processed that undergoes drawing deformation at a temperature higher than the recrystallization temperature and lower than the melting point of the metal material constituting the blank. A deep drawing method for metal materials characterized by:
、加工すべきブランクにおける絞り変形を受ける部分が
接する金型面を、前記ブランクを構成する金属材の再結
晶温度以上かつ融点未満の温度として深絞り加工を行う
ことを特徴とする金属材の深絞り加工方法。(2) In the deep drawing method for a metal material according to claim 1, the die surface in contact with the portion of the blank to be processed that undergoes drawing deformation is heated to a temperature higher than the recrystallization temperature and lower than the melting point of the metal material constituting the blank. A method for deep drawing of metal materials, which is characterized by performing deep drawing at a certain temperature.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021110A JPH03226318A (en) | 1990-01-31 | 1990-01-31 | Deep drawing method for metallic material |
| SG1996008668A SG73978A1 (en) | 1990-01-31 | 1991-01-29 | Recording mode discrimination circuit |
| AU70066/91A AU648770B2 (en) | 1990-01-31 | 1991-01-29 | Recording mode discrimination circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021110A JPH03226318A (en) | 1990-01-31 | 1990-01-31 | Deep drawing method for metallic material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03226318A true JPH03226318A (en) | 1991-10-07 |
Family
ID=12045745
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2021110A Pending JPH03226318A (en) | 1990-01-31 | 1990-01-31 | Deep drawing method for metallic material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03226318A (en) |
-
1990
- 1990-01-31 JP JP2021110A patent/JPH03226318A/en active Pending
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