JP2001205391A - Die device - Google Patents
Die deviceInfo
- Publication number
- JP2001205391A JP2001205391A JP2000013869A JP2000013869A JP2001205391A JP 2001205391 A JP2001205391 A JP 2001205391A JP 2000013869 A JP2000013869 A JP 2000013869A JP 2000013869 A JP2000013869 A JP 2000013869A JP 2001205391 A JP2001205391 A JP 2001205391A
- Authority
- JP
- Japan
- Prior art keywords
- outer members
- pair
- center core
- piston
- space
- 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.)
- Granted
Links
Landscapes
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、主型によって鋳造
される製品の内部に袋状の空間部を成形すべく、センタ
ーコアおよび該センターコアの両側面に当接する一対の
サイドコアを主型の内部に進退自在に配置した金型装置
に関する。BACKGROUND OF THE INVENTION The present invention relates to a center mold and a pair of side cores abutting on both side surfaces of the center core in order to form a bag-shaped space inside a product cast by the main mold. The present invention relates to a mold device that is disposed inside and can move forward and backward.
【０００２】[0002]
【従来の技術】内部に袋状の空間部を有する内燃機関用
ピストンを重力金型鋳造法により鋳造する場合、主型の
内部に前記空間部を成形するためのコアが配置される。
前記コアを一体物で構成するとアンダーカットの存在に
よってピストンから離型することができないため、複数
部材に分割された分割コアが採用される。かかる分割コ
アの一例として、センターコアの両側面に一対のサイド
コアは配置し、かつ前記センターコアを中央のインナー
部材と、その両側面に配置された一対のアウター部材と
から構成した５分割コアが知られている。2. Description of the Related Art When a piston for an internal combustion engine having a bag-shaped space therein is cast by gravity die casting, a core for forming the space is disposed inside a main mold.
If the core is formed as an integral body, the core cannot be released from the piston due to the presence of the undercut. Therefore, a split core divided into a plurality of members is employed. As an example of such a split core, a pair of side cores is disposed on both side surfaces of the center core, and a five-divided core in which the center core includes a central inner member and a pair of outer members disposed on both side surfaces thereof. Are known.
【０００３】図１３は前記５分割コアのセンターコアの
従来構造を示すものである。センターコア１７は中央に
位置するインナー部材１９と、その両側に位置するアウ
ター部材２０，２０とを備えており、ピストンＰの空間
部５の底壁に向けて先細にテーパーするインナー部材１
９の一対のテーパー面１９ａ，１９ａに沿って、一対の
アウター部材２０，２０が摺動自在にアリ溝係合する。
アウター部材２０，２０の下面に植設されて前記テーパ
ー面１９ａ，１９ａと平行に延びる一対のガイドピン２
２，２２が、インナー部材１９に形成した一対のガイド
孔２３，２３に摺動自在に嵌合する。ガイドピン２２，
２２はスプリング２４，２４によってガイド孔２３，２
３から突出する方向に付勢される。FIG. 13 shows a conventional structure of a center core having the five-piece core. The center core 17 includes an inner member 19 located at the center, and outer members 20 and 20 located on both sides of the inner member 19, and the inner member 1 that tapers toward the bottom wall of the space 5 of the piston P.
A pair of outer members 20, 20 are slidably engaged with the dovetail along the pair of 9 tapered surfaces 19a, 19a.
A pair of guide pins 2 implanted on the lower surfaces of the outer members 20 and 20 and extending in parallel with the tapered surfaces 19a and 19a.
2 and 22 are slidably fitted in a pair of guide holes 23 formed in the inner member 19. Guide pin 22,
22 is provided with guide holes 23, 2 by springs 24, 24.
3 is protruded in a direction protruding therefrom.
【０００４】図１３（Ａ）から明らかなように、型締め
した状態で上端が面一に整列するインナー部材１９およ
びアウター部材２０，２０によってピストンの空間部５
が成形される。図１３（Ｂ）に示すように、センターコ
ア１７を離型すべく先ずインナー部材１９を矢印ａ方向
に下降させると、スプリング２４，２４の弾発力でサイ
ドコア１６Ｌ，１６Ｒの底壁ガイド面１６ｅ，１６ｅ
（図５参照）にアウター部材２０，２０のガイド面２０
ｅ，２０ｅが押し付けられているため、アウター部材２
０，２０は下降することができず、インナー部材１９は
アウター部材２０，２０に対してテーパー面１９ａ，１
９ａを介して相対的に摺動する。その結果、アウター部
材２０，２０は矢印ｂ方向に相互に接近し、そのアンダ
ーカット部２０ａ，２０ａがピストンＰの空間部５の側
壁から離型するため、インナー部材１９およびアウター
部材２０，２０を一体でピストンＰの空間部５から引く
抜くことができる。As is apparent from FIG. 13 (A), the inner space 19 of the piston is formed by the inner member 19 and the outer members 20 whose upper ends are flush with each other in the clamped state.
Is molded. As shown in FIG. 13 (B), when the inner member 19 is first lowered in the direction of the arrow a in order to release the center core 17, the resilient force of the springs 24, 24 causes the bottom wall guide surfaces 16e of the side cores 16L, 16R. , 16e
(Refer to FIG. 5).
e and 20e are pressed, so that the outer member 2
0, 20 cannot descend, and the inner member 19 is tapered with respect to the outer members 20, 20.
It relatively slides through 9a. As a result, the outer members 20, 20 approach each other in the direction of arrow b, and the undercut portions 20a, 20a are released from the side wall of the space 5 of the piston P. It can be pulled out from the space 5 of the piston P integrally.
【０００５】[0005]
【発明が解決しようとする課題】ところで、図１３に示
すようにピストンＰの空間部５の底壁が平坦である場合
には、アウター部材２０，２０のガイド面２０ｅ，２０
ｅはサイドコア１６Ｌ，１６Ｒの底壁ガイド面１６ｅ，
１６ｅに沿って水平に滑ることができるため、アウター
部材２０，２０は相互に接近する方向に移動可能であ
る。しかしながら、鎖線で示すようにピストンＰの空間
部５の底壁が曲面で構成されている場合に、アウター部
材２０，２０のガイド面２０ｅ，２０ｅはサイドコア１
６Ｌ，１６Ｒの底壁ガイド面１６ｅ，１６ｅ（図５参
照）に沿って水平にスムーズに滑ることができず、その
接触部にカジリが発生して品質低下の原因となる問題が
ある。When the bottom wall of the space 5 of the piston P is flat as shown in FIG. 13, the guide surfaces 20e, 20e of the outer members 20, 20 are provided.
e is the bottom wall guide surface 16e of the side cores 16L and 16R,
Since it is possible to slide horizontally along 16e, the outer members 20, 20 can move in a direction approaching each other. However, when the bottom wall of the space portion 5 of the piston P is formed as a curved surface as shown by a dashed line, the guide surfaces 20e, 20e of the outer members 20, 20 are connected to the side core 1
6L and 16R cannot slide smoothly horizontally along the bottom wall guide surfaces 16e and 16e (see FIG. 5), and there is a problem that tangling is generated at the contact portion and causes quality deterioration.
【０００６】本発明は前述の事情に鑑みてなされたもの
で、インナー部材と、その両側面にテーパー面を介して
摺動自在に支持されたアウター部材とを備えたセンター
コアを、製品の空間部の底壁との干渉を避けてスムーズ
に離型させることを目的とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and is directed to a center core having an inner member and outer members slidably supported on both side surfaces via tapered surfaces. An object of the present invention is to smoothly release a mold by avoiding interference with a bottom wall of the part.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するため
に、請求項１に記載された発明によれば、主型によって
鋳造される製品の内部に袋状の空間部を成形すべく、セ
ンターコアおよび該センターコアの両側面に当接する一
対のサイドコアを主型の内部に進退自在に配置してな
り、センターコアは、前記空間部の底壁に向けて先細に
テーパーする一対のテーパー面が形成されたインナー部
材と、前記テーパー面に沿って摺動自在に支持された一
対のアウター部材とを備えた金型装置において、センタ
ーコアの一対のアウター部材を、前記空間部の底壁から
離れる方向に向けて先細にテーパーする傾斜段部を介し
てサイドコアに摺動自在に係合させ、センターコアを製
品の空間部から引き抜くときに、一対のアウター部材を
前記傾斜段部に沿って相互に接近するように斜めに移動
させることを特徴とする金型装置が提案される。According to the first aspect of the present invention, there is provided a center for forming a bag-like space inside a product cast by a main die. A core and a pair of side cores abutting on both side surfaces of the center core are arranged so as to be able to advance and retreat inside the main mold, and the center core has a pair of tapered surfaces that taper toward the bottom wall of the space. In a mold device including the formed inner member and a pair of outer members slidably supported along the tapered surface, the pair of outer members of the center core are separated from the bottom wall of the space. A pair of outer members are slidably engaged with the side cores via the inclined steps tapering toward the direction, and the pair of outer members are moved along the inclined steps when the center core is pulled out of the space of the product. Die and wherein the moving obliquely so as to approach to each other is proposed.
【０００８】上記構成によれば、センターコアのインナ
ー部材を製品の空間部から引き抜くとき、インナー部材
のテーパー面に摺動自在に支持された一対のアウター部
材が相互に接近する方向に移動して製品の空間部から離
型する。このとき、一対のアウター部材はセンターコア
の両側面に配置した一対のサイドコアに傾斜段部を介し
て摺動自在に係合しているので、一対のアウター部材は
前記傾斜段部に沿って斜めに移動しながら相互に接近す
る。従って、製品の空間部の底壁が湾曲していても、一
対のアウター部材が相互に接近する際に、その先端部が
前記底壁と干渉してカジリが発生するのを確実に防止す
ることができる。According to the above construction, when the inner member of the center core is pulled out from the space of the product, the pair of outer members slidably supported by the tapered surface of the inner member move in the direction approaching each other. Release from product space. At this time, since the pair of outer members are slidably engaged with the pair of side cores disposed on both side surfaces of the center core via the inclined steps, the pair of outer members are inclined obliquely along the inclined steps. Move closer to each other. Therefore, even when the bottom wall of the space portion of the product is curved, when the pair of outer members approach each other, it is possible to reliably prevent the tip portion from interfering with the bottom wall and generating galling. Can be.
【０００９】[0009]
【発明の実施の形態】以下、本発明の実施の形態を、添
付図面に示した本発明の実施例に基づいて説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on embodiments of the present invention shown in the accompanying drawings.
【００１０】図１〜図１２は本発明の一実施例を示すも
ので、図１は内燃機関用ピストンの底面図、図２は図１
の２−２線断面図、図３は図１の３−３線断面図、図４
は重力鋳造用金型の縦断面図、図５は型開きの途中の状
態を示す図、図６は図４の６方向矢視図、図７は図４の
７−７線断面図、図８は図４の８−８線断面図、図９は
図５の９−９線断面図、図１０は図９の１０−１０線断
面図、図１１はサイドコアおよびセンターコアの分解斜
視図、図１２は図９に対応する作用説明図である。1 to 12 show an embodiment of the present invention. FIG. 1 is a bottom view of a piston for an internal combustion engine, and FIG.
3 is a sectional view taken along line 2-2 of FIG. 1, FIG. 3 is a sectional view taken along line 3-3 of FIG.
5 is a longitudinal sectional view of a gravity casting mold, FIG. 5 is a view showing a state in the middle of mold opening, FIG. 6 is a view in the direction of arrow 6 in FIG. 4, FIG. 7 is a sectional view taken along line 7-7 in FIG. 8 is a sectional view taken along line 8-8 in FIG. 4, FIG. 9 is a sectional view taken along line 9-9 in FIG. 5, FIG. 10 is a sectional view taken along line 10-10 in FIG. 9, FIG. FIG. 12 is an operation explanatory view corresponding to FIG.
【００１１】図１〜図３は、重力鋳造金型から取り出し
たままの機械加工前の内燃機関用ピストンＰを示すもの
で、そのピストンＰは円形の頂面１の下方に連なる円柱
状のリングランド部２と、リングランド部２の直径方向
両端から下方に連なる一対のスカート部３，３と、一対
のスカート部３，３を接続する一対の壁部４，４と、ス
カート部３，３および壁部４，４に囲まれた袋状の空間
部５と、壁部４，４に設けられてピストンピン孔６，６
が貫通する一対のボス部７，７とを備えている。FIGS. 1 to 3 show a piston P for an internal combustion engine before machining, which is taken out of a gravity casting mold. The piston P is a cylindrical ring extending below the circular top surface 1. A land portion 2, a pair of skirt portions 3, 3 extending downward from both ends in the diameter direction of the ring land portion 2, a pair of wall portions 4, 4 connecting the pair of skirt portions 3, 3, and skirt portions 3, 3 And a bag-shaped space portion 5 surrounded by the wall portions 4 and 4, and piston pin holes 6 and 6 provided in the wall portions 4 and 4.
Are provided with a pair of boss portions 7, 7 penetrating therethrough.
【００１２】またピストンＰの頂面１は平坦ではなく、
この頂面１の裏側に対応する空間部５の底壁は湾曲して
いる。即ち、ピストンＰの中心面Ｃに沿う断面である図
３から明らかなように、空間部５の底壁は下向きに突出
する凸部５ａと、その前後両側に位置して上向きに凹む
一対の凹部５ｂ，５ｃとから構成される。Further, the top surface 1 of the piston P is not flat,
The bottom wall of the space portion 5 corresponding to the back side of the top surface 1 is curved. That is, as is apparent from FIG. 3, which is a cross section along the center plane C of the piston P, the bottom wall of the space portion 5 has a convex portion 5a projecting downward, and a pair of concave portions located on both front and rear sides thereof and concave upward. 5b and 5c.
【００１３】次に、図４〜図１２に基づいて重力鋳造金
型の構造を説明する。尚重力鋳造金型はピストンＰの中
心面Ｃに対して左右対称の構造を有している。Next, the structure of the gravity casting mold will be described with reference to FIGS. The gravity casting mold has a symmetrical structure with respect to the center plane C of the piston P.
【００１４】重力鋳造金型は中心面Ｃを挟んで左右２分
割された一対の主型１１Ｌ，１１Ｒを備える。主型１１
Ｌ，１１ＲはピストンＰのリングランド部２およびスカ
ート部３，３の外表面を成形するもので、左右の主型ホ
ルダー１２Ｌ，１２Ｒにそれぞれ４本のボルトＢａ，Ｂ
ａで固定されて図示せぬ駆動源で左右方向に開閉する
（図６参照）。左右の主型１１Ｌ，１１Ｒに鋳抜きピン
ガイド１３Ｌ，１３Ｒがそれぞれ２本のボルトＢｂ，Ｂ
ｂで固定されており、これら鋳抜きピンガイド１３Ｌ，
１３Ｒに、ピストンＰのボス部７，７にピストンピン孔
６，６を鋳抜くための鋳抜きピン１４Ｌ，１４Ｒが摺動
自在に支持される。鋳抜きピン１４Ｌ，１４Ｒは、図示
せぬ駆動源で鋳抜きピンガイド１３Ｌ，１３Ｒに対して
相対的に左右方向に摺動する。図示せぬ駆動源で昇降可
能な円板状のトップコア１５は、閉じた左右の主型１１
Ｌ，１１Ｌの上面開口部に嵌合してピストンＰのリング
ランド部２の上方に連なる頂面１を成形する。The gravity casting mold has a pair of main dies 11L and 11R which are divided into two parts on either side of the center plane C. Main mold 11
L and 11R are for molding the outer surfaces of the ring land portion 2 and the skirt portions 3 and 3 of the piston P, and four bolts Ba and B are provided on the left and right main mold holders 12L and 12R, respectively.
and is opened and closed in the left and right direction by a drive source (not shown) (see FIG. 6). Casting pin guides 13L, 13R are provided on the left and right main dies 11L, 11R respectively with two bolts Bb, B.
b, and these cast pin guides 13L,
Casting pins 14L and 14R for casting the piston pin holes 6 and 6 are slidably supported by the boss portions 7 and 7 of the piston P at 13R. The cast pins 14L, 14R slide in the left-right direction relative to the cast pin guides 13L, 13R by a drive source (not shown). A disc-shaped top core 15 that can be moved up and down by a drive source (not shown) is closed left and right main molds 11.
The top surface 1 that fits into the upper surface openings of L and 11L and that continues above the ring land 2 of the piston P is formed.
【００１５】ピストンＰのスカート部３，３および壁部
４，４に囲まれた下面開放の袋状の空間部５は、一対の
サイドコア１６Ｌ，１６Ｒと、両サイドコア１６Ｌ，１
６Ｒに挟まれたセンターコア１７とによって成形され
る。左右のサイドコア１６Ｌ，１６Ｒはサイドコアホル
ダー１８Ｌ，１８ＲにそれぞれボルトＢｃ，Ｂｃで固定
され、図示せぬ駆動源で左右方向に開閉駆動される。ピ
ストンＰのボス部７，７に対応して、サイドコア１６
Ｌ，１６Ｒの外面にアンダーカット部１６ａ，１６ａが
形成される。A bag-shaped space 5 having an open bottom surface and surrounded by skirts 3 and 3 and walls 4 and 4 of the piston P includes a pair of side cores 16L and 16R and both side cores 16L and 16L.
It is formed by the center core 17 sandwiched between 6Rs. The left and right side cores 16L, 16R are fixed to the side core holders 18L, 18R with bolts Bc, Bc, respectively, and are opened and closed in the left and right directions by a drive source (not shown). The side cores 16 correspond to the bosses 7, 7 of the piston P.
Undercut portions 16a, 16a are formed on the outer surfaces of L, 16R.
【００１６】図８〜図１１から明らかなように、センタ
ーコア１７はインナー部材１９と、インナー部材１９の
前後両側に配置された一対のアウター部材２０，２０と
を備える。図示せぬ駆動源で昇降するセンターコアホル
ダー２１の上面にボルトＢｄで固定されたインナー部材
１９は、前後方向（図４の紙面に直交する方向）の幅が
上方に向かって幅狭になるテーパ面１９ａ，１９ａを備
えており、このテーパ面１９ａ，１９ａに前後一対のア
ウター部材２０，２０がアリ溝係合１９ｂ，１９ｂ（図
１０参照）により摺動自在に支持される。As apparent from FIGS. 8 to 11, the center core 17 includes an inner member 19 and a pair of outer members 20 and 20 disposed on both front and rear sides of the inner member 19. The inner member 19 fixed by bolts Bd to the upper surface of the center core holder 21 that moves up and down by a drive source (not shown) has a taper whose width in the front-rear direction (the direction perpendicular to the plane of FIG. 4) becomes narrower upward. Surfaces 19a, 19a are provided, and a pair of front and rear outer members 20, 20 are slidably supported on the tapered surfaces 19a, 19a by dovetail groove engagements 19b, 19b (see FIG. 10).
【００１７】図１１に明瞭に示されるように、アウター
部材２０，２０の左右外面には、インナー部材１９と面
一の低位部２０ｂ，２０ｂと、この低位部２０ｂ，２０
ｂに対して傾斜段部２０ｃ，２０ｃを介して一段高くな
った高位部２０ｄ，２０ｄとを備えており、前記傾斜段
部２０ｃ，２０ｃは水平方向に対して上方が外側に広が
るように角度α（図９参照）だけ傾斜している。一方、
アウター部材２０，２０を挟むサイドコア１６Ｌ，１６
Ｒの内面には、アウター部材２０，２０の低位部２０
ｂ，２０ｂに摺接する高位部１６ｂと、アウター部材２
０，２０の傾斜段部２０ｃ，２０ｃに摺接する傾斜段部
１６ｃ，１６ｃと、アウター部材２０，２０の高位部２
０ｄ，２０ｄに摺接する低位部１６ｄ，１６ｄとを備え
る。As clearly shown in FIG. 11, low outer portions 20b, 20b flush with the inner member 19 are provided on the left and right outer surfaces of the outer members 20, 20, and the lower portions 20b, 20b.
b, and higher portions 20d, 20d which are one step higher than each other through inclined steps 20c, 20c, and the inclined steps 20c, 20c have an angle α such that the upper part spreads outward with respect to the horizontal direction. (See FIG. 9). on the other hand,
Side cores 16L, 16 sandwiching outer members 20, 20
The lower surface 20 of the outer member 20
b, 20b, and the outer member 2
The inclined steps 16c, 16c slidingly in contact with the 0, 20 inclined steps 20c, 20c, and the high-order portions 2 of the outer members 20, 20.
And lower portions 16d, 16d slidingly contacting 0d, 20d.
【００１８】アウター部材２０，２０の傾斜段部２０
ｃ，２０ｃの傾斜角度αは、ピストンＰの空間部５の一
対の凹部５ｂ，５ｃの凸部５ａ寄りの傾斜角度β，γ
（図９参照）よりも大きく設定されている。The inclined steps 20 of the outer members 20, 20
The inclination angles α of c and 20c are the inclination angles β and γ of the pair of recesses 5b and 5c of the space portion 5 of the piston P near the projection 5a.
(See FIG. 9).
【００１９】前後のアウター部材２０，２０の下端には
前記テーパ面１９ａ，１９ａと平行なガイドピン２２，
２２が植設されており、これらガイドピン２２，２２は
インナー部材１９およびセンターコアホルダー２１に形
成したガイド孔２３，２３に摺動自在に嵌合し、スプリ
ング２４，２４で上向きに付勢される。ガイドピン２
２，２２の中間部に形成されたフランジ状のストッパ２
２ａ，２２ａは、スプリング２４，２４の受け座として
機能するとともに、インナー部材１９に対するアウター
部材２０，２０の最大スライド量を規制する。アウター
部材２０，２０の上部に、その前後方向幅が減少するア
ンダーカット部２０ａ，２０ａが形成される。At the lower ends of the front and rear outer members 20, 20, guide pins 22 parallel to the tapered surfaces 19a, 19a are provided.
The guide pins 22, 22 are slidably fitted in guide holes 23, 23 formed in the inner member 19 and the center core holder 21, and are urged upward by springs 24, 24. You. Guide pin 2
Flange-shaped stopper 2 formed at the intermediate portion between the two
2a, 22a function as receiving seats for the springs 24, 24 and regulate the maximum sliding amount of the outer members 20, 20 with respect to the inner member 19. Undercut portions 20a, 20a whose width in the front-rear direction is reduced are formed on upper portions of the outer members 20, 20.
【００２０】固定ベース２５の上面に設置された環状の
モールドリング２６の四角形のフランジ２６ａが、合計
４本のボルトＢｅ…で固定ベース２５に締結した前後一
対のモールドリングホルダー２７，２７に上方から押圧
されて固定される（図７参照）。A rectangular flange 26a of an annular mold ring 26 installed on the upper surface of the fixed base 25 is connected to a pair of front and rear mold ring holders 27, 27 fastened to the fixed base 25 by a total of four bolts Be ... from above. It is pressed and fixed (see FIG. 7).
【００２１】次に、本発明の実施例の作用について説明
する。Next, the operation of the embodiment of the present invention will be described.
【００２２】先ず、図９および図１２に示すように、重
力鋳造金型を型締めする。型締め状態の重力鋳造金型
は、ピストンＰのリングランド部２およびスカート部
３，３を成形する左右の主型１１Ｌ，１１Ｒが相互に接
近してモールドリング２６の外周面に嵌合するととも
に、ピストンＰの頂面１を成形するトップコア１５が下
降して主型１１Ｌ，１１Ｒの上面開口に嵌合する。First, as shown in FIGS. 9 and 12, the gravity casting mold is clamped. In the gravity-casting mold in the clamped state, the left and right main dies 11L and 11R for forming the ring land portion 2 and the skirt portions 3 and 3 of the piston P are close to each other and fitted to the outer peripheral surface of the mold ring 26. The top core 15, which forms the top surface 1 of the piston P, descends and fits into the upper openings of the main dies 11L, 11R.
【００２３】ピストンＰに空間部５を成形する左右のサ
イドコア１６Ｌ，１６Ｒおよびセンターコア１７は、そ
れらの上端が面一に揃った状態で上昇端に位置してい
る。その後、ピストンＰを成形する空洞と連結する方案
部空洞を通じて溶湯が流し込まれ、凝固完了して離型可
能になるまで保持される。The left and right side cores 16L, 16R and the center core 17, which form the space 5 in the piston P, are located at the rising end with their upper ends flush with each other. Thereafter, the molten metal is poured through the plan portion cavity connected to the cavity for forming the piston P, and is held until solidification is completed and the mold can be released.
【００２４】続いて、図４に示すように、トップコア１
５を上昇させてピストンＰの頂面１を型離れさせた後
に、図５に示すように、先ず鋳抜きピン１４Ｌ，１４Ｒ
を主型１１Ｌ，１１Ｒに対して左右方向に引き抜いてピ
ストンＰのボス部７，７のピストンピン孔６，６を型離
れさせ、続いて主型１１Ｌ，１１Ｒを左右に開いてピス
トンＰのリングランド部２およびスカート部３，３を型
離れさせる。Subsequently, as shown in FIG.
5, the top surface 1 of the piston P is separated from the mold, and then, as shown in FIG.
The left and right sides of the main molds 11L and 11R are pulled out to separate the piston pin holes 6 and 6 of the boss portions 7 and 7 of the piston P from each other. The land 2 and the skirts 3 and 3 are separated from each other.
【００２５】続いて、図９および図１２に示すように、
ピストンＰのリングランド部２をチャッキングした状態
で、左右のサイドコア１６Ｌ，１６Ｒに挟まれたセンタ
ーコア１７のインナー部材１９をセンターコアホルダー
２１と共に下降させる。センターコア１７のインナー部
材１９が下降すると、インナー部材１９のテーパー面１
９ａ，１９ａのアリ溝係合１９ｂ，１９ｂするアウター
部材２０，２０は相互に接近しようとするが、アウター
部材２０，２０の傾斜段部２０ｃ，２０ｃがサイドコア
１６Ｌ，１６Ｒの傾斜段部１６ｃ，１６ｃに係合してい
るため、一対のアウター部材２０，２０は水平方向に移
動して相互に接近することができず、サイドコア１６
Ｌ，１６Ｒの傾斜段部１６ｃ，１６ｃに沿って斜め下方
に移動しながら相互に接近する。Subsequently, as shown in FIGS. 9 and 12,
With the ring land portion 2 of the piston P chucked, the inner member 19 of the center core 17 sandwiched between the left and right side cores 16L, 16R is lowered together with the center core holder 21. When the inner member 19 of the center core 17 descends, the tapered surface 1 of the inner member 19
The outer members 20, 20 that engage with the dovetail grooves 19b, 19b of the outer cores 9a, 19a attempt to approach each other, but the inclined steps 20c, 20c of the outer members 20, 20 are inclined to the inclined steps 16c, 16c of the side cores 16L, 16R. , The pair of outer members 20 and 20 cannot move in the horizontal direction and approach each other, and
L and 16R approach each other while moving diagonally downward along the inclined steps 16c and 16c.
【００２６】このとき、サイドコア１６Ｌ，１６Ｒの傾
斜段部１６ｃ，１６ｃおよびアウター部材２０，２０の
傾斜段部２０ｃ，２０ｃの傾斜角度αは、ピストンＰの
空間部５の一対の凹部５ｂ，５ｃの傾斜角度β，γより
も大きく設定されているため、アウター部材２０，２０
の上端部はピストンＰの凹部５ｂ，５ｃと干渉すること
なく斜め下方に移動し、アウター部材２０，２０のアン
ダーカット部２０ａ，２０ａがピストンＰの空間部５の
内壁面から型離れする（図１２参照）。而して、重力鋳
造金型の型開き時にアウター部材２０，２０の上端部に
よるピストンＰの空間部５の底壁のカジリを確実に防止
することができる。At this time, the inclination angle α of the inclined steps 16c, 16c of the side cores 16L, 16R and the inclined steps 20c, 20c of the outer members 20, 20 is determined by the pair of recesses 5b, 5c of the space 5 of the piston P. Since the inclination angles are set to be larger than the inclination angles β and γ, the outer members 20 and 20
Moves obliquely downward without interfering with the recesses 5b, 5c of the piston P, and the undercut portions 20a, 20a of the outer members 20, 20 are separated from the inner wall surface of the space 5 of the piston P (FIG. 12). Thus, when the gravity casting mold is opened, galling of the bottom wall of the space 5 of the piston P due to the upper ends of the outer members 20 and 20 can be reliably prevented.
【００２７】インナー部材１９の更なる下降に伴ってガ
イドピン２２，２２のストッパ２２ａ，２２ａが作用す
ると、インナー部材１９と共にアウター部材２０，２０
が下降を開始し、インナー部材１９およびアウター部材
２０，２０よりなるセンターコア１７がピストンＰの空
間部５から下方に離脱する。When the stoppers 22a of the guide pins 22, 22 act as the inner member 19 further descends, the outer members 20, 20 together with the inner member 19 are actuated.
Starts descending, and the center core 17 including the inner member 19 and the outer members 20 and 20 is separated from the space 5 of the piston P downward.
【００２８】ピストンＰを取り外した後、上述と逆の順
序で重力鋳造金型を型締めして前記工程を繰り返す。After removing the piston P, the gravity casting mold is clamped in the reverse order to the above, and the above steps are repeated.
【００２９】以上、本発明の実施例を詳述したが、本発
明はその要旨を逸脱しない範囲で種々の設計変更を行う
ことが可能である。Although the embodiments of the present invention have been described in detail, various design changes can be made in the present invention without departing from the gist thereof.
【００３０】例えば、実施例では製品として内燃機関用
ピストンＰを例示したが、本発明はサイドコア１６Ｌ，
１６Ｒおよびセンターコア１７を備えた任意の製品に対
して適用することができる。For example, in the embodiment, a piston P for an internal combustion engine is illustrated as a product, but the present invention is not limited to this.
The present invention can be applied to any product including the 16R and the center core 17.
【００３１】また実施例ではアウター部材２０，２０を
スプリング２４，２４で上方に付勢しているが、傾斜段
部２０ｃ，２０ｃ；１６ｃ，１６ｃの傾斜角度αが４５
°以上の場合には、前記スプリング２４，２４を廃止す
ることも可能である。In the embodiment, the outer members 20, 20 are urged upward by the springs 24, 24. However, the inclination angle α of the inclined steps 20c, 20c;
In the case where the angle is not less than °, the springs 24, 24 can be eliminated.
【００３２】また傾斜段部２０ｃ，２０ｃ；１６ｃ，１
６ｃの傾斜角度αは、ピストンＰの空間部５の凹部５
ｂ，５ｃの傾斜角度β，γよりも、少なくとも５°〜１
０°程度大きくすることが望ましい。The inclined steps 20c, 20c; 16c, 1
6c is equal to the recess 5 of the space 5 of the piston P.
b, 5c, at least 5 ° to 1
It is desirable to increase the angle by about 0 °.
【００３３】[0033]
【発明の効果】以上のように請求項１に記載された発明
によれば、センターコアのインナー部材を製品の空間部
から引き抜くとき、インナー部材のテーパー面に摺動自
在に支持された一対のアウター部材が相互に接近する方
向に移動して製品の空間部から離型する。このとき、一
対のアウター部材はセンターコアの両側面に配置した一
対のサイドコアに傾斜段部を介して摺動自在に係合して
いるので、一対のアウター部材は前記傾斜段部に沿って
斜めに移動しながら相互に接近する。従って、製品の空
間部の底壁が湾曲していても、一対のアウター部材が相
互に接近する際に、その先端部が前記底壁と干渉してカ
ジリが発生するのを確実に防止することができる。As described above, according to the first aspect of the present invention, when the inner member of the center core is pulled out from the space of the product, the pair of slidably supported by the tapered surfaces of the inner member. The outer members move in a direction approaching each other and release from the space of the product. At this time, since the pair of outer members are slidably engaged with the pair of side cores disposed on both side surfaces of the center core via the inclined steps, the pair of outer members are inclined obliquely along the inclined steps. Move closer to each other. Therefore, even when the bottom wall of the space portion of the product is curved, when the pair of outer members approach each other, it is possible to reliably prevent the tip portion from interfering with the bottom wall and generating galling. Can be.
【図１】内燃機関用ピストンの底面図FIG. 1 is a bottom view of an internal combustion engine piston.
【図２】図１の２−２線断面図FIG. 2 is a sectional view taken along line 2-2 of FIG.
【図３】図１の３−３線断面図FIG. 3 is a sectional view taken along line 3-3 in FIG. 1;
【図４】重力鋳造用金型の縦断面図FIG. 4 is a longitudinal sectional view of a gravity casting mold.
【図５】型開きの途中の状態を示す図FIG. 5 is a diagram showing a state in the middle of mold opening.
【図６】図４の６方向矢視図6 is a view in the direction of arrow 6 in FIG. 4;
【図７】図４の７−７線断面図FIG. 7 is a sectional view taken along line 7-7 of FIG. 4;
【図８】図４の８−８線断面図8 is a sectional view taken along line 8-8 in FIG. 4;
【図９】図５の９−９線断面図9 is a sectional view taken along line 9-9 in FIG. 5;
【図１０】図９の１０−１０線断面図FIG. 10 is a sectional view taken along line 10-10 of FIG. 9;
【図１１】サイドコアおよびセンターコアの分解斜視図FIG. 11 is an exploded perspective view of a side core and a center core.
【図１２】図９に対応する作用説明図FIG. 12 is an operation explanatory view corresponding to FIG. 9;
【図１３】従来の金型の作用説明図FIG. 13 is a diagram illustrating the operation of a conventional mold.
５ 空間部 １１Ｌ 主型 １１Ｒ 主型 １６Ｌ サイドコア １６Ｒ サイドコア １６ｃ 傾斜段部 １７ センターコア １９ インナー部材 １９ａ テーパー面 ２０ アウター部材 ２０ｃ 傾斜段部 Ｐ ピストン（製品） 5 Space 11L Main mold 11R Main mold 16L Side core 16R Side core 16c Inclined step 17 Center core 19 Inner member 19a Tapered surface 20 Outer member 20c Inclined step P Piston (product)
Claims (1)
れる製品（Ｐ）の内部に袋状の空間部（５）を成形すべ
く、センターコア（１７）および該センターコア（１
７）の両側面に当接する一対のサイドコア（１６Ｌ，１
６Ｒ）を主型（１１Ｌ，１１Ｒ）の内部に進退自在に配
置してなり、 センターコア（１７）は、前記空間部（５）の底壁に向
けて先細にテーパーする一対のテーパー面（１９ａ）が
形成されたインナー部材（１９）と、前記テーパー面
（１９ａ）に沿って摺動自在に支持された一対のアウタ
ー部材（２０）とを備えた金型装置において、 センターコア（１７）の一対のアウター部材（２０）
を、前記空間部（５）の底壁から離れる方向に向けて先
細にテーパーする傾斜段部（２０ｃ，１６ｃ）を介して
サイドコア（１６Ｌ，１６Ｒ）に摺動自在に係合させ、
センターコア（１７）を製品（Ｐ）の空間部（５）から
引き抜くときに、一対のアウター部材（２０）を前記傾
斜段部（２０ｃ，１６ｃ）に沿って相互に接近するよう
に斜めに移動させることを特徴とする金型装置。1. A center core (17) and a center core (1) for forming a bag-shaped space (5) inside a product (P) cast by a main mold (11L, 11R).
7) a pair of side cores (16L, 1
6R) is disposed inside the main molds (11L, 11R) so as to be able to advance and retreat, and the center core (17) has a pair of tapered surfaces (19a) tapering toward the bottom wall of the space (5). ), And a pair of outer members (20) slidably supported along the tapered surface (19a). A pair of outer members (20)
Are slidably engaged with the side cores (16L, 16R) via inclined steps (20c, 16c) tapering in a direction away from the bottom wall of the space (5),
When the center core (17) is pulled out of the space (5) of the product (P), the pair of outer members (20) are moved obliquely so as to approach each other along the inclined steps (20c, 16c). A mold apparatus characterized by causing the mold apparatus to perform the following steps.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000013869A JP3406266B2 (en) | 2000-01-18 | 2000-01-18 | Mold equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000013869A JP3406266B2 (en) | 2000-01-18 | 2000-01-18 | Mold equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001205391A true JP2001205391A (en) | 2001-07-31 |
| JP3406266B2 JP3406266B2 (en) | 2003-05-12 |
Family
ID=18541402
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000013869A Expired - Fee Related JP3406266B2 (en) | 2000-01-18 | 2000-01-18 | Mold equipment |
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| Country | Link |
|---|---|
| JP (1) | JP3406266B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008062244A (en) * | 2006-09-05 | 2008-03-21 | Hitachi Ltd | Metallic casting mold device, and casting method using the same |
| US7740049B2 (en) | 2004-06-21 | 2010-06-22 | Honda Motor Co., Ltd. | Mold device and method of manufacturing cylinder block |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6045008B2 (en) | 2013-09-27 | 2016-12-14 | 本田金属技術株式会社 | Piston casting method and piston casting apparatus |
-
2000
- 2000-01-18 JP JP2000013869A patent/JP3406266B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7740049B2 (en) | 2004-06-21 | 2010-06-22 | Honda Motor Co., Ltd. | Mold device and method of manufacturing cylinder block |
| JP2008062244A (en) * | 2006-09-05 | 2008-03-21 | Hitachi Ltd | Metallic casting mold device, and casting method using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3406266B2 (en) | 2003-05-12 |
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