JPH0543967Y2 - - Google Patents
Info
- Publication number
- JPH0543967Y2 JPH0543967Y2 JP12302888U JP12302888U JPH0543967Y2 JP H0543967 Y2 JPH0543967 Y2 JP H0543967Y2 JP 12302888 U JP12302888 U JP 12302888U JP 12302888 U JP12302888 U JP 12302888U JP H0543967 Y2 JPH0543967 Y2 JP H0543967Y2
- Authority
- JP
- Japan
- Prior art keywords
- core
- flip
- product
- center
- gap
- 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 - Lifetime
Links
- 238000005520 cutting process Methods 0.000 description 3
- 230000002452 interceptive effect Effects 0.000 description 3
- 230000013011 mating Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
Landscapes
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Description
【考案の詳細な説明】
産業上の利用分野
本考案は溶湯鍛造法等において使用される中子
型に関する。[Detailed Description of the Invention] Industrial Application Field The present invention relates to a core mold used in a molten metal forging method and the like.
従来の技術
一般に、溶湯鍛造法やダイカスト等において使
用される中子型は、金型に対して出し入れ可能に
するため、その形状が抜き勝手に形成されている
（例えば、実開昭56−71356号公報参照）。Conventional technology In general, core molds used in molten metal forging, die casting, etc. are shaped so that they can be pulled out easily in order to be able to be taken in and out of the mold (for example, (see publication).
考案が解決しようとする課題
従つて、アンダーカツト部を有する製品、例え
ばスカート部に補強用リブが形成されるピストン
の鋳造では、アンダーカツト部の成形ができない
ため、予め肉厚を厚くして成形し、その後に切削
加工により所望のアンダーカツト形状に仕上げて
いる。その結果、切削加工が困難な部位の余肉に
起因して製品重量が増加したり、別工程となる切
削加工により生産コストが増加するという問題が
あつた。Problems to be Solved by the Invention Therefore, when casting a product with an undercut part, for example, a piston in which a reinforcing rib is formed on the skirt part, the undercut part cannot be formed, so it is necessary to make the wall thickness thicker beforehand. After that, the desired undercut shape is finished by cutting. As a result, there have been problems in that the weight of the product increases due to excess material in areas that are difficult to cut, and the production cost increases due to cutting, which is a separate process.
そこで、本考案はこれら従来技術の問題点を解
消し得る中子型を提供することを目的とする。 Therefore, an object of the present invention is to provide a core mold that can solve the problems of these conventional techniques.
課題を解決するための手段
即ち、本考案は、抜け勾配が付さけた板状のセ
ンターコアの両側にそれぞれフイリツプコアが配
置されると共に、これらセンターコア及びフイリ
ツプコアを介して一対のサイドコアが対峙して配
置されてなる略円柱形の分割中子型であつて、フ
イリツプコアとサイドコアとの接合面に係合部が
形成され、この係合部にはフイリツプコアの半径
方向内方への移動を可能にする隙間が形成された
ことを特徴としている。Means for Solving the Problem That is, in the present invention, flip cores are arranged on both sides of a plate-shaped center core with a draft, and a pair of side cores face each other via the center core and the flip core. It is a roughly cylindrical split core type in which an engaging portion is formed on the joining surface of the flip core and the side core, and this engaging portion allows the flip core to move inward in the radial direction. It is characterized by the formation of a gap.
作 用
本考案は上記したように分割された中子型であ
るため、先ずセンターコアが製品から抜かれた
後、フイリツプコアがサイドコアとの係合部の隙
間分だけ半径方向内方へ移動させられて製品から
抜かれる。次いで、サイドコアがセンターコア及
びフイリツプコアが抜けてできた隙間分だけ半径
方向内方へ移動させられて製品から抜かれる。従
つて、アンダーカツト部を有する製品であつて
も、製品に干渉することなく中子型を抜くことが
可能となる。Function Since the present invention is a split core type as described above, first the center core is removed from the product, and then the flip core is moved radially inward by the gap between the engagement portion with the side core. removed from the product. Next, the side cores are moved radially inward by the gap created when the center core and flip core are removed, and removed from the product. Therefore, even if the product has an undercut portion, the core mold can be removed without interfering with the product.
実施例 以下本考案の実施例を図面に基づき詳述する。Example Embodiments of the present invention will be described in detail below with reference to the drawings.
第１ａ図〜第１ｃ図は分割中子型の組立図を示
すもので、分割中子型は取付部Ａ，Ｂを除き全体
として略円柱形を呈しており、中央に位置する板
状のセンターコア１と、このセンターコア１の両
側に配置された一対のフイリツプコア２と、これ
らセンターコア１及びフイリツプコア２を介して
対峙して配置された一対のサイドコア３とに５分
割されている。 Figures 1a to 1c show assembly diagrams of the split core mold.The split core mold has a generally cylindrical shape as a whole except for the mounting parts A and B, and a plate-shaped center located in the center. It is divided into five parts: a core 1, a pair of flip cores 2 disposed on both sides of the center core 1, and a pair of side cores 3 disposed facing each other with the center core 1 and the flip core 2 interposed therebetween.
このうち、センターコア１は、第２ａ図〜第２
ｂ図に示すように抜け勾配θ1，θ2が付されてい
る。そして、サイドコア３との合せ面には、サイ
ドコア３の係合突起４（第４ａ図〜第４ｃ図参
照）を受容する受容部５が形成されている。 Among these, the center core 1 is
As shown in figure b, draft angles θ 1 and θ 2 are attached. A receiving portion 5 for receiving the engagement protrusion 4 (see FIGS. 4a to 4c) of the side core 3 is formed on the mating surface with the side core 3.
第３ａ図〜第３ｃ図はフイリツプコア２を示す
もので、このフイリツプコア２の両側にはそれぞ
れ支持突起６が形成されている。このフイリツプ
コア２は、センターコア１と共にサイドコア３の
合せ面に密接するが、支持突起６とサイドコア３
の係合突起４との係合部７には隙間８が生じるよ
うに形成されている（第１ｂ図〜第１ｃ図参照）。
従つて、フイリツプコア２は、センターコア１が
抜かれた後に隙間８の量だけ半径方向内方へ移動
させることが可能となる。 3a to 3c show a flip core 2, and support projections 6 are formed on both sides of the flip core 2, respectively. This flip core 2 is in close contact with the mating surface of the side core 3 together with the center core 1, but the support protrusion 6 and the side core 3 are in close contact with each other.
A gap 8 is formed between the engaging portion 7 and the engaging protrusion 4 (see FIGS. 1b to 1c).
Therefore, the flip core 2 can be moved radially inward by the amount of the gap 8 after the center core 1 is removed.
第４ａ図〜第４ｃ図はサイドコア３を示すもの
で、このサイドコア３の側面（センターコア１及
びフイリツプコア２との合せ面）には、前述した
ようにセンターコア１の受容部５に受容される係
合突起４が形成されている。又、サイドコア３に
は、フイリツプコア２との係合部７の隙間８に溶
湯が侵入するのを防止するため、フイリツプコア
２の支持突起上面６ａに当接するシヨルダー部９
が係合突起４と一体形成されている。 4a to 4c show the side core 3, and the side surface of the side core 3 (the mating surface with the center core 1 and the flip core 2) has a shape that is received in the receiving portion 5 of the center core 1 as described above. An engaging protrusion 4 is formed. The side core 3 also has a shoulder portion 9 that comes into contact with the upper surface 6a of the support protrusion of the flip core 2 in order to prevent molten metal from entering the gap 8 between the engagement portion 7 and the flip core 2.
is integrally formed with the engagement protrusion 4.
ここで、分割中子型と製品１０との関係につい
て説明する。即ち、分割中子型は、第５ａ図〜第
５ｂ図に示すように、アンダーカツト部１１を有
する製品１０に対して、（Ｈ＞Ｆ，Ｕ＞Ｅ）であ
り、｛（Ｒ−Ｐ）＞（Ｇ−Ｈ）｝となるように形成さ
れる。 Here, the relationship between the split core mold and the product 10 will be explained. That is, as shown in FIGS. 5a to 5b, the split core mold is (H>F, U>E) with respect to the product 10 having the undercut portion 11, and {(R-P) >(GH)}.
以上の実施例構造によれば、分割中子型は、鋳
造終了後に先ずセンターコア１が製品１０（キヤ
ビテイ）から抜かれる。次いで、フイリツプコア
２が係合部７の隙間８の分だけ半径方向内方へ移
動させられる。これによつて、フイリツプコア２
は、製品１０のアンダーカツト部１１に干渉する
ことなく、製品１０から抜かれる。次いで、サイ
ドコア３がセンターコア１及びフイリツプコア２
が抜けて生じた隙間分だけ半径方向内方へ移動さ
せられる。これによつて、サイドコア３は、フイ
リツプコア２と同様に製品１０のアンダーカツト
部１１に干渉するこなく、製品１０から抜かれ
る。このように本実施例によれば、製品１０にア
ンダーカツト部１１がある場合でも、容易に型抜
きができるため、例えば形状が複雑な自動車用エ
ンジンのピストンの中子型として使用することが
可能となり、その実用的効果は極めて大きい。 According to the structure of the above embodiment, in the split core mold, the center core 1 is first removed from the product 10 (cavity) after the casting is completed. Next, the flip core 2 is moved radially inward by the gap 8 between the engaging portions 7. With this, Philip Core 2
is removed from the product 10 without interfering with the undercut portion 11 of the product 10. Next, the side core 3 is connected to the center core 1 and the flip core 2.
is moved radially inward by the gap created by the gap. As a result, the side core 3 is removed from the product 10 without interfering with the undercut portion 11 of the product 10 like the flip core 2. As described above, according to this embodiment, even if the product 10 has the undercut portion 11, it can be easily removed from the mold, so that it can be used, for example, as a core mold for a piston of an automobile engine having a complicated shape. Therefore, the practical effect is extremely large.
考案の効果
以上述べたように本考案は、中子型が５分割さ
れ、フイリツプコアとサイドコアとの係合部には
フイリツプコアの半径方向内方への移動を可能に
する隙間が形成されているため、センターコアが
製品から抜かれた後はフイリツプコアを係合部の
隙間分だけ半径方向内方へ移動させて製品から抜
くことができ、さらにサイドコアをセンターコア
及びフイリツプコアが抜けてできた隙間分だけ半
径方向内方へ移動させて製品から抜くことができ
る。従つて、アンダーカツト部を有する製品であ
つても、その製品から中子型を容易に分離でき
る。そのため、従来行われていた製品の切削加工
が不要となり、生産コストを低減することができ
ると共に、製品の余肉を減少させて製品の軽量化
を図ることができる。Effects of the invention As described above, the invention has the following advantages: the core mold is divided into five parts, and a gap is formed at the engagement portion between the flip core and the side core to allow the flip core to move inward in the radial direction. After the center core is removed from the product, the flip core can be moved radially inward by the gap between the engagement parts and removed from the product, and the side core can be moved radially inward by the gap created when the center core and flip core are pulled out. It can be removed from the product by moving it inward. Therefore, even if the product has an undercut portion, the core mold can be easily separated from the product. Therefore, cutting of the product, which has been conventionally performed, is no longer necessary, and production costs can be reduced, and the excess thickness of the product can be reduced, making it possible to reduce the weight of the product.
第１ａ図は本考案の実施例を示す分割中子型の
正面図、第１ｂ図は同平面図、第１ｃ図は同側面
図、第２ａ図はセンターコアの正面図、第２ｂ図
は同側面図、第３ａ図はフイリツプコアの正面
図、第３ｂ図は同左側面図、第３ｃ図は同右側面
図、第４ａ図はサイドコアの正面図、第４ｂ図は
同側面図、第４ｃ図は第４ｂ図の−断面図、
第５ａ図は製品の縦断面図、第５ｂ図は第５ａ図
の−断面図。
１……センターコア、２……フイリツプコア、
３……サイドコア、７……係合部、８……隙間、
θ1，θ2……抜け勾配。
Fig. 1a is a front view of a split core mold showing an embodiment of the present invention, Fig. 1b is a plan view of the same, Fig. 1c is a side view of the same, Fig. 2a is a front view of the center core, and Fig. 2b is the same. 3a is a front view of the flip core, 3b is a left side view, 3c is a right side view, 4a is a front view of the side core, 4b is a side view, and 4c is a side view of the side core. - sectional view of FIG. 4b,
FIG. 5a is a vertical cross-sectional view of the product, and FIG. 5b is a cross-sectional view taken from FIG. 5a. 1... Center core, 2... Philips core,
3... Side core, 7... Engaging portion, 8... Gap,
θ 1 , θ 2 ...Draft slope.
Claims (1)
にそれぞれフイリツプコアが配置されると共に、
これらセンターコア及びフイリツプコアを介して
一対のサイドコアが対峙して配置されてなる略円
柱形の分割中子型であつて、フイリツプコアとサ
イドコアとの接合面に係合部が形成され、この係
合部にはフイリツプコアの半径方向内方への移動
を可能にする隙間が形成されたことを特徴とする
分割中子型。 A flip core is placed on each side of a plate-shaped center core with a draft slope,
It is a roughly cylindrical split core type in which a pair of side cores are arranged facing each other through a center core and a flip core, and an engaging portion is formed on the joint surface of the flip core and the side core. A split core type characterized by having a gap formed therein that allows the flip core to move inward in the radial direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12302888U JPH0543967Y2 (en) | 1988-09-20 | 1988-09-20 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12302888U JPH0543967Y2 (en) | 1988-09-20 | 1988-09-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0242735U JPH0242735U (en) | 1990-03-23 |
| JPH0543967Y2 true JPH0543967Y2 (en) | 1993-11-08 |
Family
ID=31371508
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12302888U Expired - Lifetime JPH0543967Y2 (en) | 1988-09-20 | 1988-09-20 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0543967Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4445335B2 (en) * | 2004-06-21 | 2010-04-07 | 本田技研工業株式会社 | Mold apparatus and cylinder block manufacturing method |
-
1988
- 1988-09-20 JP JP12302888U patent/JPH0543967Y2/ja not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0242735U (en) | 1990-03-23 |
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