JPH0133263B2 - - Google Patents
Info
- Publication number
- JPH0133263B2 JPH0133263B2 JP58090179A JP9017983A JPH0133263B2 JP H0133263 B2 JPH0133263 B2 JP H0133263B2 JP 58090179 A JP58090179 A JP 58090179A JP 9017983 A JP9017983 A JP 9017983A JP H0133263 B2 JPH0133263 B2 JP H0133263B2
- Authority
- JP
- Japan
- Prior art keywords
- nib
- die
- nut
- fitted
- ring
- 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
- 238000005336 cracking Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000005482 strain hardening Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010721 machine oil Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 102200082907 rs33918131 Human genes 0.000 description 1
- 102200082816 rs34868397 Human genes 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/02—Dies or mountings therefor
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Description
本発明は冷間塑性加工で使用されるナツトフオ
ーマー用又はボルトフオーマー用ダイスに関する
ものである。
従来ナツト又はボルトをダイスを用いて冷間塑
性加工しようとすると、ニブに形成された六角孔
の各面にかかる大きな力によつて六角孔の各角部
にこれを割ろうとする大きな集中力が働くことに
より、六角孔の各角部で割れ易いという欠点があ
つた。これを防止するための対策として、例えば
第1,2図に示すナツトフオーマー用ダイスで
は、6個のニブ小片1を組合せてニブ2とし、ニ
ブ2外周を円形に加工し、次に内周が円形の内ケ
ース3及び内リング4に嵌め、これらをダイスケ
ース5に嵌めていた。こうして内リング4および
ダイスケース5により横方向負荷と応力を吸収し
ニブ2を補強していたのである。しかしこの様な
補強でもニブ2の欠け割れはなくならず、更に一
層の改良が望まれていた。またニブ2は超硬合金
で製造されているため、ニブ小片1を組合せた
後、これの外周に内ケース3および内リング4を
嵌めるため円形に加工するということは、非常な
困難を伴うという欠点があつた。
そこで本発明者は、まず、ニブの欠け割れを減
少させるため鋭意検討を重ねた。そして発見した
ことはニブの欠け割れは、第3図の様にニブ2内
周の六角形の角部6および角部6より半径方向延
長線上に多く発生することであつた。そこでその
原因を追及し次の様な仮説をたてた。すなわちニ
ブ2の厚みは角部6より半径方向延長線上(つま
りニブ小片1の境目)が長さ(S)と一番薄く、
角部6と角部6との中央付近の厚みが長さlと一
番厚く、この厚さの違いが内ケース3の締付け力
に対し不均衡をもたらし、冷間塑性加工時大きな
負荷がかかり、一番薄い個所付近が破損するので
はないかとの説である。そこでこの仮説を確かめ
るために一番大きな負荷がかかる角部6付近を一
番厚くするニブ2の形状について検討し第4,5
図に示すダイスを考えた。同図において1はニブ
小片で、脚7と8は等しい長さで上底9は下底1
0よりも短い等脚の台形形状である。このニブ小
片1を6個上底9を内側にし、脚7,8をそれぞ
れ接触させて組合せ、内周および外周共に正六角
形のニブ2とする。なおニブ2は先端にいくに従
つて外径が細くなるようテーパー状に形成してあ
る。2aはニブ2の内側に位置する内外径共に円
形のニブで、このニブは割れていない。ニブ2a
の外側には、形状がニブ2a外周と相似のリング
4が嵌めてある。該六角リング4の内周はニブ2
a外周より若干小さめの寸法であり、ニブ2aは
リング4の内側へ冷間圧入するか或いは焼きばめ
されている。リング4の外側およびニブ2外側に
は更に内周に段差を設けた内ケース3が冷間圧入
或いは焼きばめすることによつて嵌められてい
る。内ケース3の内周はニブ2,2aの外周に嵌
め込み可能な正六角形で外周は円形である。そし
てニブがダイス軸方向における外方のもの2と内
方のもの2aとの2段に分けられており、この2
つのニブ2,2aが協同してナツトを加工する。
またリングもリング4と内ケース3とに分けられ
ている。11はニブ2aのより内方に嵌められて
いるダイススペーサーで、上述のニブ2,2a、
六角リング、内ケース3と共にダイスケース5に
嵌められている。なお12,13,14は各部品
の境目に説けてある遊びである。
以上のように構成されたダイスを用いてナツト
を製作するには、ニブ2の内側にナツト素材を入
れパンチすると、素材はニブ2,2aの内周に対
応した六角形又は円形に形成される。その成形時
にかかる六角孔15各面の負荷は、六角孔15各
角部6を割る力として作用するが、このダイスで
は角孔15の中心17とニブ外周とを結ぶ線上の
厚みは、ニブ小片1の境目が長さ(S)と一番厚
くなる。言い換えれば一番耐久力を必要とする個
所が一番厚く形成されている。そのため、割れに
対する抵抗力が従来品に比べて一段と向上するよ
うになつた。また、ニブの外周は従来品の様に円
形に加工する必要がなく、台形形状のニブ小片1
を組合せるだけでそのまま使用できる。そのため
超硬合金を加工する手間が省けダイスの製作コス
トを大幅に引き下げることができるようになつ
た。
しかしこのような第4,5図に示すダイスをボ
ルト頭が正方形のダイスに応用し、第6図のよう
なダイスを製作し、使用すると従来品よりは向上
しているが、なお耐久性に充分でなく更い高性能
のダイスが要望されている。
そこで本発明者は数々の実験を重ねた結果、特
定の個所に切欠きを設けると更に耐久性が増すこ
とを見出し本発明を完成した。
すなわち本発明の目的は従来品よりも遥かに耐
久性に優れたダイスを提供することにあり、かか
る目的は台形形状のニブ小片を4個組合せて外周
が正方形のニブとし、その外側に内周が正方形で
外周が円形のリングを嵌め、更にその外側にダイ
スケースを嵌めたナツトフオーマー用又はボルト
フオーマー用ダイスにおいて、ニブ小片の境目と
外周との交点付近に応力逃がし用切欠きを設けた
ことを特徴とするナツトフオーマー用又はボルト
フオーマー用ダイスにより達成される。
以下に本発明を詳細に説明するに、第7図は本
発明第1実施例であつて、本実施例では、ニブ小
片1の境目24と外周との交点付近に応力逃がし
用切欠き25を設けている。この切欠き25はこ
の部分に応力が集中するのを防止してニブ2の割
れを一層減少させる。この理由は次の様に推定さ
れる。すなわち、冷間加工の際は、第7図の矢印
で示す様に四角孔15に強力な内圧Pが作用す
る。円管が内圧を受けると管壁には円周方向の引
張り応力(円周応力又はたが張り応力ともいう)
が生ずるが、本実施例の場合も内圧Pによりニブ
2の内壁に円周応力が発生する。この円周応力に
より四角孔15の角部6と切欠き25とに応力の
集中が起こる。切欠き25がないと、角部6のみ
に応力が集中し割れ易くなる。切欠き25がある
と応力が分散し割れが大幅に減少するものと考え
られる。
またダイス内に空気や機械油がこもり、これら
がダイス外へ逃げることができず、エアクツシヨ
ン、ハイドロクツシヨン等として働き、加工作業
を阻害したり、ニブ2が破損することがあるが、
本実施例切欠き25は空気や油をここからダイス
外へ逃がす役割もするものと考えられる。なお、
応用逃し用切欠きは下側のニブ2aに設けても良
いことは当然である。
第8図は本発明第2実施例であつて、本実施例
では、ニブ小片1の境目16と外周との交点26
付近に接する内ケース3内側に応力逃し用切欠き
27が設けてある。この切欠きも、上記第1実施
例の応力逃し用切欠き25と同様の効果をもたら
す。
第9図は本発明第3実施例であつて、本実施例
は本発明をボルトフオーマー用ダイス、詳しくは
アプセツトボルトフオーマー用ダイスに適用した
例である。ダイスケース5の先端面に形成された
ニブ圧入穴29にはリング30を介してニブ2が
圧入されている。ニブ2は第1、2実施例と同様
に台形状のニブ小片1が組み合されたものであ
り、リング30は内周が四角形で外周が円形で、
しかも応力逃し用切欠きが設けてある。31はダ
イス支持部で、中心にはアプセツトボルト32お
よびエジクターピン33の挿入孔34が形成され
ており、ニブ2との接触面中央部には超硬ダイス
35が埋め込まれている。
このように構成された本実施例のダイスを用い
てアプセツトボルト32の頭部32aを冷間塑性
加工するには、まず挿入孔34に荒押加工済ボル
トを挿入し、次に二番パンチ36により頭部32
aをパンチする。すると、同頭部32aはニブ2
の四角孔15に対応した四角形に成形され、この
時四角孔15各面には大きな負荷がかかるが、本
実施例では第1実施例で述べたと同様の理由によ
りニブ2は割れ難い。
以上詳述した様に本発明ダイスは、ニブ小片を
組合せたものであり、ニブの内周も外周も正方形
であり、ニブ小片の境目と外周との交点付近に応
用逃がし用切欠きを設けてある。そのため冷間加
工時ニブが破損しにくく、ニブを交換することな
く長時間冷間加工することができる。
試しに被加工材として鋼S10CとS45Cを用い、
これをJIS B1171で定めるM8の角根丸頭ボルト
の四角部分を冷間加工し、ニブが破損せずにどれ
だけのボルトを加工できたかを比較したものであ
る。結果を表1に示す。
The present invention relates to a nut former or bolt former die used in cold plastic working. Conventionally, when a nut or bolt is subjected to cold plastic working using a die, the large force applied to each side of the hexagonal hole formed in the nib causes a large concentrated force to break at each corner of the hexagonal hole. The drawback was that the corners of the hexagonal hole were likely to break due to working. As a measure to prevent this, for example, in the nut former die shown in Figs. 1 and 2, six small nib pieces 1 are combined to form a nib 2, the outer periphery of the nib 2 is processed into a circular shape, and then the inner periphery is processed into a circular shape. The die case 3 and the inner ring 4 were fitted into the die case 5, and these were fitted into the die case 5. In this way, the inner ring 4 and the die case 5 absorb the lateral load and stress, thereby reinforcing the nib 2. However, even with such reinforcement, chipping and cracking of the nib 2 did not disappear, and further improvements were desired. Furthermore, since the nib 2 is made of cemented carbide, it is extremely difficult to assemble the nib pieces 1 and then process them into a circular shape in order to fit the inner case 3 and inner ring 4 around the outer periphery. There were flaws. Therefore, the inventor of the present invention first made extensive studies to reduce the occurrence of chipping and cracking of the nib. What was discovered was that, as shown in FIG. 3, more chipping and cracking of the nib occurred on the hexagonal corner 6 of the inner periphery of the nib 2 and on the radial extension line of the corner 6. Therefore, we investigated the cause and formulated the following hypothesis. In other words, the thickness of the nib 2 is the thinnest on the radial extension line from the corner 6 (that is, the boundary between the nib pieces 1) and the length (S),
The thickness near the center of the corner portions 6 is the thickest with the length l, and this difference in thickness causes an imbalance in the tightening force of the inner case 3, resulting in a large load being applied during cold plastic processing. The theory is that the damage occurs near the thinnest part. Therefore, in order to confirm this hypothesis, we investigated the shape of the nib 2 that is thickest near the corner 6 where the greatest load is applied.
Consider the die shown in the figure. In the figure, 1 is a small nib piece, legs 7 and 8 are of equal length, and the upper base 9 is the lower base 1.
It has an isosceles trapezoidal shape that is shorter than 0. Six of these nib pieces 1 are assembled with the upper base 9 facing inside and the legs 7 and 8 are in contact with each other to form a nib 2 having a regular hexagonal shape on both the inner and outer peripheries. Note that the nib 2 is formed in a tapered shape so that the outer diameter becomes thinner toward the tip. 2a is a nib that is located inside the nib 2 and is circular in both its inner and outer diameters, and this nib is not cracked. Nib 2a
A ring 4 having a shape similar to the outer periphery of the nib 2a is fitted on the outside of the nib 2a. The inner circumference of the hexagonal ring 4 is the nib 2
The nib 2a is slightly smaller than the outer circumference of the ring 4, and the nib 2a is cold press-fitted or shrink-fitted into the inside of the ring 4. An inner case 3 having a step on the inner periphery is fitted to the outside of the ring 4 and the outside of the nib 2 by cold press-fitting or shrink-fitting. The inner periphery of the inner case 3 is a regular hexagon that can be fitted onto the outer periphery of the nibs 2, 2a, and the outer periphery is circular. The nib is divided into two stages, an outer nib 2 and an inner nib 2a in the die axis direction.
The two nibs 2, 2a work together to process the nut.
The ring is also divided into a ring 4 and an inner case 3. 11 is a die spacer that is fitted inward of the nib 2a, and is a die spacer that is fitted inside the nib 2a,
It is fitted into the die case 5 together with the hexagonal ring and the inner case 3. Note that 12, 13, and 14 are plays that are explained at the boundaries of each part. To manufacture a nut using the die configured as described above, when a nut material is put inside the nib 2 and punched, the material is formed into a hexagonal or circular shape corresponding to the inner circumference of the nibs 2 and 2a. . The load applied to each side of the hexagonal hole 15 during molding acts as a force that breaks each corner 6 of the hexagonal hole 15, but in this die, the thickness on the line connecting the center 17 of the square hole 15 and the outer circumference of the nib is The boundary between 1 and the length (S) is the thickest. In other words, the parts that require the most durability are made thickest. As a result, the resistance to cracking has improved even more than conventional products. In addition, there is no need to process the outer periphery of the nib into a circular shape unlike conventional products, and the trapezoidal nib piece 1
You can use it as is by just combining it. This eliminates the need to process cemented carbide, making it possible to significantly reduce die manufacturing costs. However, when the dies shown in Figures 4 and 5 are applied to dies with square bolt heads, and the dies shown in Figure 6 are manufactured and used, they are improved over conventional products, but the durability is still poor. There is a demand for dies with even higher performance. As a result of numerous experiments, the inventor of the present invention found that providing notches at specific locations further increases durability and completed the present invention. That is, the purpose of the present invention is to provide a die that is far more durable than conventional products.The purpose of this invention is to combine four small trapezoidal nib pieces to form a nib with a square outer circumference, and to form a nib with an inner circumference on the outside. A die for nut formers or bolt formers that has a square ring with a circular outer periphery and a die case fitted on the outside thereof, and a stress relief notch is provided near the intersection of the boundary between the nib pieces and the outer periphery. This is achieved by a nut former or bolt former die characterized by the following. To explain the present invention in detail below, FIG. 7 shows a first embodiment of the present invention, and in this embodiment, a stress relief notch 25 is provided near the intersection of the boundary 24 of the nib piece 1 and the outer periphery. It is set up. This notch 25 prevents stress from concentrating on this portion, further reducing cracking of the nib 2. The reason for this is presumed as follows. That is, during cold working, a strong internal pressure P acts on the square hole 15 as shown by the arrow in FIG. When a circular pipe receives internal pressure, the pipe wall experiences tensile stress in the circumferential direction (also called circumferential stress or hoop stress).
However, in this embodiment as well, circumferential stress is generated on the inner wall of the nib 2 due to the internal pressure P. This circumferential stress causes stress concentration at the corner 6 of the square hole 15 and the notch 25. Without the notch 25, stress would concentrate only on the corner 6, making it more likely to break. It is believed that the presence of the notches 25 disperses stress and significantly reduces cracking. In addition, air and machine oil may become trapped inside the die and cannot escape to the outside of the die, acting as an air action or a hydraulic action, which may impede processing operations or damage the nib 2.
It is believed that the notch 25 in this embodiment also serves to allow air and oil to escape from there to the outside of the die. In addition,
It goes without saying that the relief notch may be provided on the lower nib 2a. FIG. 8 shows a second embodiment of the present invention. In this embodiment, the intersection point 26 of the boundary 16 of the nib piece 1 and the outer
A stress relief notch 27 is provided on the inner side of the inner case 3 adjacent to the inner case 3. This notch also provides the same effect as the stress relief notch 25 of the first embodiment. FIG. 9 shows a third embodiment of the present invention, and this embodiment is an example in which the present invention is applied to a die for a bolt former, more specifically, a die for an upset bolt former. The nib 2 is press-fitted into a nib press-fitting hole 29 formed on the front end surface of the die case 5 via a ring 30. The nib 2 is a combination of trapezoidal nib pieces 1 as in the first and second embodiments, and the ring 30 has a square inner circumference and a circular outer circumference.
Moreover, a stress relief notch is provided. Reference numeral 31 denotes a die support part, in which an insertion hole 34 for an upset bolt 32 and an ejector pin 33 is formed in the center, and a carbide die 35 is embedded in the center of the contact surface with the nib 2. In order to perform cold plastic working on the head 32a of the upset bolt 32 using the die of this embodiment configured as described above, first insert the rough pressed bolt into the insertion hole 34, and then insert a second punch into the head 32a of the upset bolt 32. Head 32 by 36
Punch a. Then, the head 32a is the nib 2
Although a large load is applied to each side of the square hole 15 at this time, in this embodiment, the nib 2 is difficult to break for the same reason as described in the first embodiment. As detailed above, the die of the present invention is a combination of small nib pieces, the inner and outer peripheries of the nib are square, and a relief notch is provided near the intersection of the border of the nib pieces and the outer periphery. be. Therefore, the nib is less likely to be damaged during cold working, and cold working can be performed for a long time without replacing the nib. As a trial, we used steel S10C and S45C as work materials,
This was done by cold working the square part of an M8 square root round head bolt specified by JIS B1171, and comparing how many bolts could be machined without damaging the nib. The results are shown in Table 1.
【表】
このように本実施例のダイスは従来に比して極
めて高い耐久性を有している。
また本発明は、ニブの外周を円形に加工する必
要もないので、製造が簡単でコストも安価に済む
という利点もある。[Table] As described above, the die of this example has extremely high durability compared to the conventional die. Further, the present invention has the advantage that manufacturing is simple and the cost is low because there is no need to process the outer periphery of the nib into a circular shape.
第1図は従来のナツトフオーマー用ダイスの1
例を示す縦断面図、第2図は同例の正面図、第3
図は従来のニブの割れる状態を示す正面図、第4
図は従来のナツトフオーマー用ダイスの別例を示
す縦断面図、第5図は同例の正面図であり、第6
図は従来のダイスの別例を示す正面図、第7図は
本発明第1実施例を示す正面図、第8図は本発明
第2実施例を示す正面図、第9図は本発明第3実
施例を示す縦断面図である。
1……ニブ小片、2……ニブ、3……ブツシ
ユ、4……パンチケース、5……角部、10……
ダイス。
Figure 1 shows a conventional nut former die.
A vertical cross-sectional view showing an example, Figure 2 is a front view of the same example, Figure 3 is a front view of the same example, and Figure 3 is a front view of the same example.
The figure is a front view showing how a conventional nib cracks.
The figure is a vertical sectional view showing another example of the conventional nut former die, FIG. 5 is a front view of the same example, and FIG.
The figure is a front view showing another example of the conventional die, FIG. 7 is a front view showing the first embodiment of the present invention, FIG. 8 is a front view showing the second embodiment of the present invention, and FIG. 9 is a front view showing the second embodiment of the present invention. FIG. 3 is a vertical cross-sectional view showing a third embodiment. 1...Nib piece, 2...Nib, 3...Button, 4...Punch case, 5...Corner, 10...
dice.
Claims (1)
方形のニブとし、その外側に内周が正方形で外周
が円形のリングを嵌め、更にその外側にダイスケ
ースを嵌めたナツトフオーマー用又はボルトフオ
ーマー用ダイスにおいて、ニブ小片の境目と外周
との交点付近に応力逃がし用切欠きを設けたこと
を特徴とするナツトフオーマー用又はボルトフオ
ーマー用ダイス。 2 正方形のニブを軸方向において外方と内方の
2段に嵌めた特許請求の範囲第1項記載のナツト
フオーマー用ダイス。 3 リングが2つに分けられている特許請求の範
囲第1項記載のナツトフオーマー用ダイス。[Scope of Claims] 1. A nut former in which four small trapezoidal nib pieces are combined to form a nib with a square outer circumference, a ring with a square inner circumference and a circular outer circumference is fitted on the outside of the nib, and a die case is further fitted on the outside of the nib. A die for nut formers or bolt formers, characterized in that the die for nut formers or bolt formers is provided with a stress relief notch near the intersection of the boundary of the nib piece and the outer periphery. 2. The nut former die according to claim 1, in which square nibs are fitted in two stages, outer and inner, in the axial direction. 3. The nut former die according to claim 1, wherein the ring is divided into two.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9017983A JPS591043A (en) | 1983-05-23 | 1983-05-23 | Die |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9017983A JPS591043A (en) | 1983-05-23 | 1983-05-23 | Die |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10533880A Division JPS5731434A (en) | 1980-07-31 | 1980-07-31 | Die |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS591043A JPS591043A (en) | 1984-01-06 |
JPH0133263B2 true JPH0133263B2 (en) | 1989-07-12 |
Family
ID=13991256
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9017983A Granted JPS591043A (en) | 1983-05-23 | 1983-05-23 | Die |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS591043A (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0627241Y2 (en) * | 1986-01-23 | 1994-07-27 | 小川鉄工株式会社 | Cold die |
JP6410135B2 (en) * | 2013-10-01 | 2018-10-24 | 日立金属株式会社 | Hot forging die |
JP6528941B2 (en) * | 2015-04-17 | 2019-06-12 | 日立金属株式会社 | Hot forging die |
JP6521369B2 (en) * | 2015-05-11 | 2019-05-29 | 日立金属株式会社 | Hot forging die |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5613624A (en) * | 1979-07-14 | 1981-02-10 | Matsushita Electric Works Ltd | Toggle switch |
JPS5731434A (en) * | 1980-07-31 | 1982-02-19 | Mitsutoyo Kiko Kk | Die |
JPS5739853A (en) * | 1980-08-25 | 1982-03-05 | Terumo Corp | Hollow fiber type artificial lung device |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52142936U (en) * | 1976-04-23 | 1977-10-29 |
-
1983
- 1983-05-23 JP JP9017983A patent/JPS591043A/en active Granted
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5613624A (en) * | 1979-07-14 | 1981-02-10 | Matsushita Electric Works Ltd | Toggle switch |
JPS5731434A (en) * | 1980-07-31 | 1982-02-19 | Mitsutoyo Kiko Kk | Die |
JPS5739853A (en) * | 1980-08-25 | 1982-03-05 | Terumo Corp | Hollow fiber type artificial lung device |
Also Published As
Publication number | Publication date |
---|---|
JPS591043A (en) | 1984-01-06 |
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