JPS6219933B2 - - Google Patents
Info
- Publication number
- JPS6219933B2 JPS6219933B2 JP4656078A JP4656078A JPS6219933B2 JP S6219933 B2 JPS6219933 B2 JP S6219933B2 JP 4656078 A JP4656078 A JP 4656078A JP 4656078 A JP4656078 A JP 4656078A JP S6219933 B2 JPS6219933 B2 JP S6219933B2
- Authority
- JP
- Japan
- Prior art keywords
- wrinkles
- mold
- cast iron
- occur
- shell
- 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
- 230000037303 wrinkles Effects 0.000 claims description 11
- 229910001141 Ductile iron Inorganic materials 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 235000019994 cava Nutrition 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Description
【発明の詳細な説明】
本発明は金型ダクタイル鋳鉄の表面に発生する
しわの防止法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preventing wrinkles occurring on the surface of ductile cast iron molds.
一般にダクタイル鋳鉄の金型鋳造は、砂型鋳造
に比較して引けの発生が非常に少なく、有利な鋳
造法であるが、鋳造品表面に発生するしわのため
に実用化を断念する場合が多い。従来このしわは
湯じわと呼ばれ、鋳込まれた溶湯が金型表面を流
れる際に生じると考えられ、種々の対策が講じら
れて来たが、所期の目的を達成することはできな
かつた。 In general, mold casting of ductile cast iron is an advantageous casting method as it produces far less shrinkage than sand mold casting, but its practical application is often abandoned due to wrinkles that occur on the surface of the cast product. Conventionally, these wrinkles are called hot water wrinkles, and are believed to occur when the molten metal flows over the surface of the mold, and various countermeasures have been taken, but none of them have been able to achieve the intended purpose. Nakatsuta.
本発明者は長年の研究の結果、このしわが、鋳
鉄が溶湯の状態で発生するのではなく、金型に接
した表面が薄い皮殻状に完全に凝固した後、この
皮殻が急激に膨張を起すことによるものであるこ
とをつきとめた。すなわち膨張を起した皮殻は、
金型表面との間ですべりを生じながら皮殻の圧縮
強度の弱い場所に向つて移動し、ここで未凝固の
内部に向つて折重なつて陥没し、しわ状の欠陥を
形成することを見出した。 As a result of many years of research, the inventor has discovered that these wrinkles do not occur when the cast iron is in a molten state, but after the surface in contact with the mold has completely solidified into a thin crust, this crust suddenly forms. It was determined that this was caused by expansion. In other words, the expanded skin shell is
While slipping between the mold surface and the shell, it moves toward the weaker compressive strength of the shell, where it folds and caves in toward the unsolidified interior, forming wrinkle-like defects. I found it.
したがつて本発明の目的は金型のキヤビテイ表
面にすべり止めの凹凸をつけることにより達成さ
れる。この凹凸の深さまたは高さは0.2mm以下で
はその効果が小さく、また１mm以上では効果はあ
るが、鋳造品の外観上、機能上問題となる場合が
多いため0.2〜１mmとした。また凹部、凸部の面
積の比率は、１：１から凹部又は凸部が点状に分
布するものまで総べて効果があり、その形状も自
由である。 Therefore, the object of the present invention is achieved by providing anti-slip irregularities on the cavity surface of the mold. If the depth or height of the unevenness is 0.2 mm or less, the effect is small, and if it is 1 mm or more, the effect is good, but it often causes problems in terms of appearance and function of the cast product, so it is set to 0.2 to 1 mm. Further, the ratio of the areas of the concave portions and convex portions is all effective from 1:1 to one in which the concave portions or convex portions are distributed in a dotted manner, and the shape thereof is also free.
本発明は以上の如く段付きでしわの発生し易い
形状にもかかわらず、小さなしわに分散され、大
きく深いしわは全く発生していない。 As described above, in the present invention, despite the stepped shape which tends to cause wrinkles, the wrinkles are dispersed into small wrinkles and no large deep wrinkles are generated at all.
以上のように金型キヤビテイ表面に凹凸をつけ
ることにより、有害なしわの発生しない金型ダク
タイル鋳鉄を製造することができる。 By creating irregularities on the surface of the mold cavity as described above, it is possible to produce a ductile cast iron mold without harmful wrinkles.
Claims (1)
ヤビテイ表面に0.2〜１mmの深さ、または高さを
有する凹凸をつけたことを特徴とする鋳造品表面
のしわ防止方法。1. A method for preventing wrinkles on the surface of a cast product in mold casting of ductile cast iron, characterized by forming irregularities with a depth or height of 0.2 to 1 mm on the surface of the mold cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4656078A JPS54138826A (en) | 1978-04-21 | 1978-04-21 | Preventing surface wrinkle of cast product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4656078A JPS54138826A (en) | 1978-04-21 | 1978-04-21 | Preventing surface wrinkle of cast product |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS54138826A JPS54138826A (en) | 1979-10-27 |
| JPS6219933B2 true JPS6219933B2 (en) | 1987-05-01 |
Family
ID=12750698
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4656078A Granted JPS54138826A (en) | 1978-04-21 | 1978-04-21 | Preventing surface wrinkle of cast product |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS54138826A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63256251A (en) * | 1987-04-13 | 1988-10-24 | Toyota Motor Corp | Method for preventing casting defect in die casting |
-
1978
- 1978-04-21 JP JP4656078A patent/JPS54138826A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS54138826A (en) | 1979-10-27 |
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