JPH01150429A - Method for holding collapsible staying core - Google Patents

Method for holding collapsible staying core

Info

Publication number
JPH01150429A
JPH01150429A JP30953187A JP30953187A JPH01150429A JP H01150429 A JPH01150429 A JP H01150429A JP 30953187 A JP30953187 A JP 30953187A JP 30953187 A JP30953187 A JP 30953187A JP H01150429 A JPH01150429 A JP H01150429A
Authority
JP
Japan
Prior art keywords
core
mold
collapsible core
die
pressure reducing
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
Application number
JP30953187A
Other languages
Japanese (ja)
Other versions
JP2505229B2 (en
Inventor
Kazuchika Ando
安藤 和親
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Priority to JP62309531A priority Critical patent/JP2505229B2/en
Publication of JPH01150429A publication Critical patent/JPH01150429A/en
Application granted granted Critical
Publication of JP2505229B2 publication Critical patent/JP2505229B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

PURPOSE:To improve positioning accuracy of a collapsible core by sucking the collapsible core by using a pressure reducing passage, which opens in a cutting part at a wall part of a die. CONSTITUTION:An intermediate die 35 composing of a fixed die 33 and right and left half-cutting dies 35a, 35b is arranged to a movable upper die 34 fitting a die 21. Then, the pressure reducing passage 29 opening in the cutting part 26 is connected with a pressure reducing source 31 and a pressurized air supplying source 32 through a selector valve 30, respectively. The pressure reducing source 31 is connected with the pressure reducing passage 29 through the selector valve 30 under condition inserting the collapsible core 28 into each cutting part in the wall part 23 of the die. Then, suction force with reduced pressure is acted to the core 28 and continued till completion of filling up molten metal into cavity 37. By this method, as suction force with reduced pressure adding to friction force with the cutting wall face is given to the core 28, the positioning accuracy of the collapsible core 28 is improved.

Description

【発明の詳細な説明】 (産業上の利用分野) この発明は、崩壊性置中子の保持方法、たとえば、エン
ジンのシリンダブロックを鋳造するに際し、デツキに、
ウォータジャケットのブリッジ部を形成するために寄与
する崩壊性置中子を、所定位置に極めて安定に、かつ確
実に保持するものである。
Detailed Description of the Invention (Industrial Application Field) The present invention provides a method for holding a collapsible core, for example, when casting a cylinder block for an engine.
The collapsible core, which contributes to forming the bridge portion of the water jacket, is extremely stably and reliably held in a predetermined position.

(従来の技術) デツキに、ウォータジャケットのブリッジ部を形成する
ための従来のこの種の中子保持方法としては、たとえば
特開昭59−232654号公報に開示されたものがあ
る。
(Prior Art) A conventional core holding method of this type for forming a bridge portion of a water jacket on a deck is disclosed in, for example, Japanese Patent Laid-Open No. 59-232654.

これは、第3図に示すシリンダブロック1の平面図にお
いて、デツキ2に、シリンダライナ3を囲繞するウォー
タジャケット4のブリッジ部5を、所定の間隔をおいて
形成するために、第4図に示すように、固定下型6と可
動上型7との間に、開閉自在の左右の型半部8a、8b
からなる中間型8を配設し、そしてこれらの冬型6,7
.8と、シリンダライナ3とで区画されるキャビティ9
内へ、可動上型7に取り付けられてウォータジャケット
4の形成に寄与するジャケット金型10を、下向きに突
出させてなり、そのジャケット金型10には、ブリッジ
部5の形成のために、第5図に示すように、それの周方
向の所定位置に設けた切欠11内に、砂中子12を嵌め
合わせ、その砂中子12と、切欠11の上縁との中に、
ブリッジ部5の所要の厚さに応じた間隙13を残存させ
ることとしている。
This is because, in the plan view of the cylinder block 1 shown in FIG. 3, the bridge portions 5 of the water jacket 4 surrounding the cylinder liner 3 are formed on the deck 2 at predetermined intervals. As shown, between the fixed lower mold 6 and the movable upper mold 7, there are left and right mold halves 8a and 8b that can be opened and closed.
An intermediate type 8 consisting of
.. 8 and the cylinder liner 3.
A jacket mold 10 that is attached to the movable upper mold 7 and contributes to the formation of the water jacket 4 is made to protrude downward. As shown in FIG. 5, a sand core 12 is fitted into a notch 11 provided at a predetermined position in the circumferential direction, and between the sand core 12 and the upper edge of the notch 11,
A gap 13 corresponding to the required thickness of the bridge portion 5 is left.

(発明が解決しようとする問題点) ところが、このような従来技術にあっては、ジャケット
金型10の切欠11内の砂中子12の保持を、それら両
者の摩擦掛合のみにて行っており、しかも、その砂中子
12には、ジャケット金型1oの円滑なる抜き取りのた
めの抜き勾配が設けられていることから、全ての砂中子
12を、それぞれの切欠11内の所定位置に、常にかつ
確実に維持することが甚だ困難であるという問題があっ
た。
(Problems to be Solved by the Invention) However, in such prior art, the sand core 12 within the notch 11 of the jacket mold 10 is held only by friction between the two. Moreover, since the sand cores 12 are provided with a draft angle for smooth extraction of the jacket mold 1o, all the sand cores 12 are placed at predetermined positions within the respective notches 11. There has been a problem in that it is extremely difficult to maintain it constantly and reliably.

この発明は、従来技術のかかる問題点に着目してなされ
たものであり、金型壁部の切欠内に、砂その他からなる
崩壊性置中子を、常に適正に保持することができる崩壊
性置中子の保持方法を提供するものである。
The present invention has been made by focusing on the problems of the prior art, and it is possible to maintain a collapsible core made of sand or other material properly at all times within a cutout of a mold wall. The present invention provides a method for holding a core.

(問題点を解決するための手段) この発明の、崩壊性置中子の保持方法は、金型壁部に設
けた切欠内へ崩壊性置中子を嵌め込んで保持するに際し
、その崩壊性置中子を、金型壁部に形成されて前記切欠
に開口する減圧通路を介して吸引するものである。
(Means for Solving the Problems) The method for holding a collapsible core according to the present invention is to prevent the collapse of the collapsible core when the collapsible core is fitted into a notch provided in a mold wall and held. The placed core is sucked through a vacuum passage formed in the wall of the mold and opening into the notch.

(作用) この保持方法によれば、金型壁部に嵌め合わされた崩壊
性置中子は、それと金型との摩擦掛合力によって脱落を
拘束されることはもちろんであるが、とくには、減圧吸
引によって、金型に対する相対変位を有効に阻止される
ことになるので、その崩壊性置中子を、金型に対する所
定位置に、確実に維持することができる。
(Function) According to this holding method, the collapsible core fitted to the mold wall is not only restrained from falling off by the frictional force between it and the mold, but also Since the suction effectively prevents relative displacement with respect to the mold, the collapsible core can be reliably maintained at a predetermined position with respect to the mold.

なおここにおいて、崩壊性置中子の減圧吸引を注湯の終
了に至るまで継続した場合には、金型壁部に形成した減
圧通路は、ガス抜き通路としてもまた機能することがで
き、鋳造欠陥の発生を十分に防止することができる。
Here, if the vacuum suction of the collapsible core is continued until the end of pouring, the vacuum passage formed in the mold wall can also function as a gas vent passage, and the casting The occurrence of defects can be sufficiently prevented.

さらに、この一方において、減圧通路を、切換弁その他
の作用下にて、圧縮空気供給通路として作用させた場合
には、鋳造の終了後におけるそこからの圧縮空気の噴出
により、鋳造品内に置き去りにした崩壊性置中子の嵌め
込み部分、正確には、金型の、置中子との接触面を十分
清浄ならしめることができる。
Furthermore, on the other hand, if the pressure reduction passage is operated as a compressed air supply passage under the action of a switching valve or other means, compressed air may be ejected from there after casting is completed, causing air to be left inside the cast product. The part into which the collapsible core is fitted, more precisely, the contact surface of the mold with the core can be kept sufficiently clean.

(実施例) 以下にこの発明を図示例に基づいて説明する。(Example) The present invention will be explained below based on illustrated examples.

第1図は金型を示す底面斜視図であり、図中21はウォ
ータジャケットの形成に寄与する金型を、22は、金型
21に、ボルトその他によって固定したもしくは一体形
成した金型ホルダをそれぞれ示す。
FIG. 1 is a bottom perspective view showing the mold, and in the figure, 21 is a mold that contributes to the formation of a water jacket, and 22 is a mold holder fixed to the mold 21 with bolts or other means or integrally formed therewith. Each is shown below.

ここにおける金型21は、三個所の括れ部を介して連続
する。それぞれがほぼ円筒状の四速の金型壁部23から
なり、それらの各金型壁部23の中央部には、図に仮想
線で示すシリンダライナ24を嵌め合わせるためのライ
ナホルダ25が、金型壁部23より丈高に突出する。
The mold 21 here is continuous through three constrictions. Each of the four-speed mold walls 23 has a substantially cylindrical shape, and in the center of each of the mold walls 23, there is a liner holder 25 for fitting a cylinder liner 24 shown in phantom lines in the figure. It projects taller than the mold wall part 23.

ここでは、それぞれの金型壁部23に、所定の間隔をお
いて、その上下方向へ貫通するそれぞれの切欠26、い
いかえれば、軸線方向へ延在する切除部分をそれぞれ設
け、これらの各切欠26の幅を、その下端部で前述した
ブリッジ部の所要厚さに応じた長さで狭窄する。
Here, each mold wall 23 is provided with respective notches 26 passing through it in the vertical direction at predetermined intervals, in other words, cutout portions extending in the axial direction, and each of these notches 26 The width of the bridge is narrowed at its lower end to a length corresponding to the required thickness of the bridge section described above.

またここでは、金型壁部23の、このような各切欠26
に対し、切欠26の横断面形状と対応する形状、図では
円弧状に彎曲しつつ、両側端部に、“く”字状に突出す
る金型掛合部27を有する崩壊性置中子28を、切欠2
6が狭窄される位置まで確実に、かつ緊密に嵌め込む。
Also, here, each such notch 26 of the mold wall 23 is
On the other hand, the collapsible core 28 has a shape corresponding to the cross-sectional shape of the notch 26, which is curved in an arc shape in the figure, and has mold engagement parts 27 protruding in a "dog" shape at both ends. , cutout 2
6 is firmly and tightly fitted until the position is narrowed.

なおここで、切欠26および崩壊性置中子28は、鋳造
の終了後において、金型21を、崩壊性置中子28を鋳
造品の内部に残存させたまま円滑に取り除くことを可能
ならしめるため、下方へ向けて漸次狭幅となる抜き勾配
を有する。
Note that the notch 26 and the collapsible core 28 make it possible to smoothly remove the mold 21 after casting is completed, with the collapsible core 28 remaining inside the cast product. Therefore, it has a draft angle that gradually becomes narrower toward the bottom.

そしてさらに、金型壁部23には、その内部に形成され
て、切欠26の少なくとも一側面に開口する減圧通路2
9を設け、これらの各減圧通路29を、直接的にもしく
は切換弁を介して、真空ポンプその他の減圧源に接続す
る。
Further, the mold wall portion 23 has a decompression passage 2 formed therein and opening on at least one side of the notch 26.
9, and each of these pressure reduction passages 29 is connected directly or via a switching valve to a vacuum pump or other pressure reduction source.

第2図は以上のような金型21の、鋳造型への適用例を
示す断面図であり、これは、切欠26に開口する減圧通
路29を、切換弁30を介して減圧源31および加圧空
気供給源32のそれぞれに接続したものである。
FIG. 2 is a sectional view showing an example of application of the mold 21 as described above to a casting mold. It is connected to each of the compressed air supply sources 32.

なお、図中33は固定下型を、34は、金型21を取り
付けた可動上型を、そして、35は中間型をそれぞれ示
し、この中間型35は、開閉可能な左右の型半部35a
、35bからなる。
In the figure, 33 indicates a fixed lower mold, 34 a movable upper mold to which the mold 21 is attached, and 35 an intermediate mold.
, 35b.

ここで、この発明では、金型壁部23のそれぞれの切欠
26内へ崩壊性置中子28を、第1図に示すように十分
適正に嵌め込んだ状態の下で、切換弁30の作用によっ
て減圧源31を減圧通路29に接続することにより、各
崩壊性置中子28に減圧吸引力を作用させ、かかる吸引
力の作用を、第2図に示すように型閉めが終了し、そし
て、ランナ36からキャビテ37への溶湯の充填が完了
するまで、より好ましくは、その溶湯が凝固するまで継
続する。
Here, in the present invention, when the collapsible cores 28 are properly fitted into the respective notches 26 of the mold wall 23 as shown in FIG. By connecting the reduced pressure source 31 to the reduced pressure passage 29, a reduced pressure suction force is applied to each collapsible core 28, and the action of the suction force is applied until mold closing is completed and then as shown in FIG. , continues until the filling of the molten metal from the runner 36 into the cavity 37 is completed, more preferably until the molten metal solidifies.

このことにより、崩壊性置中子28は、それと切欠壁面
との摩擦力に加え、切欠26の少なくとも一側面に形成
された開口からの減圧吸引力を受けることになって、所
定の位置に、十分正確に保持されることになり、所期し
た通りの形状および寸法を有する鋳造品、ここではシリ
ンダブロックが、常にかつ確実に鋳造されることになり
、そのデツキには、第3図に示したと同様に、シリンダ
ブロックの剛性アップ十分有効に寄与し得る適正厚さの
ブリッジ部が形成されることにない。
As a result, the collapsible core 28 receives a reduced pressure suction force from the opening formed in at least one side of the notch 26 in addition to the frictional force between it and the notch wall surface, so that the collapsible core 28 is held in a predetermined position. It will be held sufficiently precisely that a casting, here a cylinder block, of the desired shape and dimensions will always and reliably be cast; Similarly, a bridge portion having an appropriate thickness that can effectively contribute to increasing the rigidity of the cylinder block cannot be formed.

なおここで、上述した減圧吸引を、注湯の完了に至るま
で継続した場合には、崩壊性置中子28に含まれる粘結
材、水分などからの発生ガスが、極めて有効に型外へ排
出されることになるので、その発生ガスに起因する鋳造
欠陥をほぼ完全に取り除くことができる。
Note that if the vacuum suction described above is continued until the pouring is completed, the gas generated from the caking agent, moisture, etc. contained in the collapsible core 28 will be extremely effectively removed from the mold. Since the gas is discharged, casting defects caused by the generated gas can be almost completely eliminated.

そして、このようにして鋳造を完了した後は、可動上型
34を上昇させることにより、金型21は、それぞれの
崩壊性置中子28をシリンダブロック内に置き去りにし
たまま上方へ抜は出し、それぞれの金型壁部23によっ
て、デツキに、ウォータジャケットの開口部を形成する
After the casting is completed in this way, by raising the movable upper mold 34, the mold 21 is pulled out upward while leaving each collapsible core 28 inside the cylinder block. , each mold wall 23 forms a water jacket opening in the deck.

そこで、その後は、切換弁30をシストさせることによ
って、減圧通路29を加圧空気供給源32に接続するこ
とにより、切欠26の側面開口から加圧空気を噴出させ
て、その切欠側面に付着した崩壊性置中子28の残渣を
十分に取り除くことができる。
Therefore, after that, by switching the switching valve 30 and connecting the pressure reduction passage 29 to the pressurized air supply source 32, pressurized air is blown out from the side opening of the notch 26, and the air that adheres to the side surface of the notch is blown out. The residue of the collapsible core 28 can be sufficiently removed.

従ってここにおいては、金型壁部23の切欠26内へ嵌
め込んだ崩壊性置中子28を、切欠26に開口する減圧
通路29を介してその切欠内に吸引保持することにより
、崩壊性置中子28を所定の位置に十分正確に位置決め
することができ、この結果として、所期した通りの鋳造
品が常に確実に製造されることになる。
Therefore, here, the collapsible core 28 fitted into the notch 26 of the mold wall 23 is suctioned and held within the notch via the decompression passage 29 that opens in the notch 26. The core 28 can be positioned sufficiently accurately in a predetermined position, as a result of which it is ensured that the intended casting is always produced.

(発明の効果) かくして、この発明によれば、金型壁部に形成されて、
そこに設けた切欠に開口する減圧通路を介して、切欠内
へ嵌め込んだ崩壊性置中子を吸引保持することにより、
その崩壊性置中子を所定位置に正確に維持することがで
き、所期した通りの形状および寸法を有する鋳造品を、
つねに確実に製造することができる。
(Effects of the Invention) Thus, according to the present invention, the mold is formed on the mold wall,
By suctioning and holding the collapsible core inserted into the notch through a decompression passage that opens into the notch provided there,
The collapsible core can be maintained precisely in place, producing a cast product with the desired shape and dimensions.
It can always be manufactured reliably.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図はこの発明の実施に用いる金型構造を例示する底
面斜視図、 第2図はこの発明方法による鋳造例を示す断面図、 第3図は鋳造品を例示する平面図、 第4図は従来の鋳造型を例示する断面図、第5図は従来
方法を例示する図である。 21・・・金型        23・・・金型壁部2
5・・・ライナホルダ    26・・・切欠27・・
・金型掛合部     28・・・崩壊性置中子29・
・・減圧通路      30・・・切換弁31・・・
減圧源 特許出願人  日産自動車株式会社 第1図 第2図
Fig. 1 is a bottom perspective view illustrating a mold structure used in carrying out the present invention, Fig. 2 is a sectional view showing an example of casting by the method of this invention, Fig. 3 is a plan view illustrating a cast product, Fig. 4 5 is a sectional view illustrating a conventional casting mold, and FIG. 5 is a diagram illustrating a conventional method. 21...Mold 23...Mold wall part 2
5... Liner holder 26... Notch 27...
・Mold engaging part 28...Collapsible core 29・
...Reducing pressure passage 30...Switching valve 31...
Decompression source patent applicant Nissan Motor Co., Ltd. Figure 1 Figure 2

Claims (1)

【特許請求の範囲】 1、金型壁部に設けた切欠内へ崩壊性置中子を嵌め込ん
で保持するに際し、 金型壁部に形成されて前記切欠に開口する減圧通路を介
して崩壊性置中子を吸引することを特徴とする崩壊性置
中子の保持方法。
[Claims] 1. When a collapsible core is fitted into and held in a notch provided in a mold wall, the collapsible core is collapsed via a decompression passage formed in the mold wall and opened to the notch. A method for holding a collapsible core, the method comprising sucking the core.
JP62309531A 1987-12-09 1987-12-09 How to hold a collapsible storage core Expired - Fee Related JP2505229B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62309531A JP2505229B2 (en) 1987-12-09 1987-12-09 How to hold a collapsible storage core

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62309531A JP2505229B2 (en) 1987-12-09 1987-12-09 How to hold a collapsible storage core

Publications (2)

Publication Number Publication Date
JPH01150429A true JPH01150429A (en) 1989-06-13
JP2505229B2 JP2505229B2 (en) 1996-06-05

Family

ID=17994135

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62309531A Expired - Fee Related JP2505229B2 (en) 1987-12-09 1987-12-09 How to hold a collapsible storage core

Country Status (1)

Country Link
JP (1) JP2505229B2 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5392841A (en) * 1994-06-10 1995-02-28 General Motors Corporation Mounting expendable core in die cast die
US5690159A (en) * 1995-09-07 1997-11-25 Ryobi Ltd. Casting apparatus and casting method for producing cylinder block
JP2008161916A (en) * 2006-12-28 2008-07-17 Honda Motor Co Ltd Core, casting method and mold for casting
EP1952914A3 (en) * 2007-01-22 2009-11-11 KS Aluminium-Technologie GmbH Device and core for manufacturing a cylinder crank case
JP2022047379A (en) * 2020-09-11 2022-03-24 本田技研工業株式会社 Casting device and casting method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59232654A (en) * 1983-06-17 1984-12-27 Honda Motor Co Ltd Production of cylinder block
JPS60108152A (en) * 1983-11-16 1985-06-13 Nissan Motor Co Ltd Casting mold
JPS61259855A (en) * 1985-05-14 1986-11-18 Fuji Heavy Ind Ltd Gas venting device in casting

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59232654A (en) * 1983-06-17 1984-12-27 Honda Motor Co Ltd Production of cylinder block
JPS60108152A (en) * 1983-11-16 1985-06-13 Nissan Motor Co Ltd Casting mold
JPS61259855A (en) * 1985-05-14 1986-11-18 Fuji Heavy Ind Ltd Gas venting device in casting

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5392841A (en) * 1994-06-10 1995-02-28 General Motors Corporation Mounting expendable core in die cast die
US5690159A (en) * 1995-09-07 1997-11-25 Ryobi Ltd. Casting apparatus and casting method for producing cylinder block
JP2008161916A (en) * 2006-12-28 2008-07-17 Honda Motor Co Ltd Core, casting method and mold for casting
EP1952914A3 (en) * 2007-01-22 2009-11-11 KS Aluminium-Technologie GmbH Device and core for manufacturing a cylinder crank case
JP2022047379A (en) * 2020-09-11 2022-03-24 本田技研工業株式会社 Casting device and casting method

Also Published As

Publication number Publication date
JP2505229B2 (en) 1996-06-05

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