JPS6260181B2 - - Google Patents
Info
- Publication number
- JPS6260181B2 JPS6260181B2 JP11973181A JP11973181A JPS6260181B2 JP S6260181 B2 JPS6260181 B2 JP S6260181B2 JP 11973181 A JP11973181 A JP 11973181A JP 11973181 A JP11973181 A JP 11973181A JP S6260181 B2 JPS6260181 B2 JP S6260181B2
- Authority
- JP
- Japan
- Prior art keywords
- core
- thermal expansion
- cylindrical
- seal packing
- mold
- 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
- 238000012856 packing Methods 0.000 claims description 10
- 239000004576 sand Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000007789 sealing Methods 0.000 description 6
- 238000005266 casting Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000009415 formwork Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 230000013011 mating Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Description
【発明の詳細な説明】
本発明は、例えばエンジンのシリンダブロツク
などの円筒部を有する部品の鋳造方法、特にこれ
に使用する中子の熱膨張による割れを防止するよ
うにした砂型に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for casting parts having a cylindrical portion, such as engine cylinder blocks, and particularly to a sand mold used in the casting method to prevent cracking due to thermal expansion of the core used in the casting method. .
シリンダブロツクなどの鋳型は多数の中子の組
み合わせによつて構成されている。中子を組み合
わせる場合、中子相互の固定のためと、注湯時中
子の組合せ面からの湯洩れを防止するために、耐
熱性の接着材を用いているが、中子が互いに接着
材によつて固定されていると、中子の熱膨張を吸
収することができず、中子が割れることがある。
このような中子の割れが生じた場合には、鋳造品
は製品として使用できない。 Molds such as cylinder blocks are constructed by combining a large number of cores. When combining cores, a heat-resistant adhesive is used to secure the cores together and to prevent melt from leaking from the combined surface of the cores during pouring. If the core is fixed with
If such a core crack occurs, the cast product cannot be used as a product.
また、中子と中子との接触面は張り合わせて互
いに固定する必要のある部分と、中子の熱膨張を
吸収するために固定してはならない部分とがあ
る。何れの場合も隙間があると、その部分から湯
が洩れ出るので、隙間をシールする必要がある。 In addition, the contact surfaces between the cores include a portion that needs to be fixed to each other by pasting them together, and a portion that must not be fixed in order to absorb thermal expansion of the cores. In either case, if there is a gap, hot water will leak from that area, so it is necessary to seal the gap.
従来、固定式のシール部材は実用化されている
が、中子と中子の相対移動を許容する適当なシー
ル方法はない。従来の相対移動を許容する部分の
シール方法を、シリンダブロツク鋳型の場合につ
いて説明すると、第１，２図に示すとおりであ
る。 Conventionally, fixed sealing members have been put to practical use, but there is no suitable sealing method that allows relative movement between the cores. The conventional method of sealing parts that allow relative movement will be explained in the case of a cylinder block mold as shown in FIGS. 1 and 2.
箱形の型枠１３の内部に砂８を詰め込み、これ
に円錐部９を有するレール中子３および円筒部１
４を有する中子６を配置し、円錐部９および円筒
部１４にクランクケース中子１の円錐部１ｂ、円
筒部１ａをそれぞれ挿入する。そして、砂型本体
の一部であるレール中子３の端部とクランクケー
ス中子１の端部との間にくさび４，５をそれぞれ
打ち込み、さらに砂７を型込めした型枠１２を型
枠１３の上に重ね合わせて、鋳型が構成される。 A box-shaped formwork 13 is filled with sand 8, and a rail core 3 having a conical portion 9 and a cylindrical portion 1 are placed inside the box-shaped formwork 13.
4, and insert the conical part 1b and cylindrical part 1a of the crankcase core 1 into the conical part 9 and the cylindrical part 14, respectively. Then, wedges 4 and 5 are driven between the end of the rail core 3 and the end of the crankcase core 1, which are part of the sand mold body, and the mold 12 filled with sand 7 is then placed in the mold. 13 to form a mold.
このようにして、クランクケース中子１の外側
にシリンダヘツド取付部Ａ、シリンダ部Ｂおよび
クランクケース部Ｃが鋳造されるようになつてい
る。シリンダヘツド取付部Ａの端部から左方へ湯
が洩れないようにするために、第２図に示すよう
にレール中子３の円錐部９の右端側に、中子１の
円筒部１ａの外径よりも僅かに大きな内径の円筒
部１０を形成し、かつ円錐部９と円筒部１０との
間に段部２１を設ける。一方、中子１の円筒部１
ａと円錐部１ｂとの間に段部２２を設ける。そし
て、レール中子３に対して中子１の円筒部１ａを
組み付ける場合に、円筒部１ａの熱膨張を考慮し
て段部２１と段部２２との間に隙間ｓを設ける。
さらに、円錐部９と円筒部１０との間に接着材２
４を充填して両者を固定する。 In this way, the cylinder head attachment part A, the cylinder part B, and the crankcase part C are cast on the outside of the crankcase core 1. In order to prevent hot water from leaking to the left from the end of the cylinder head mounting part A, the cylindrical part 1a of the rail core 1 is attached to the right end of the conical part 9 of the rail core 3, as shown in FIG. A cylindrical part 10 having an inner diameter slightly larger than the outer diameter is formed, and a step part 21 is provided between the conical part 9 and the cylindrical part 10. On the other hand, the cylindrical part 1 of the core 1
A step portion 22 is provided between a and the conical portion 1b. When assembling the cylindrical portion 1a of the core 1 to the rail core 3, a gap s is provided between the stepped portion 21 and the stepped portion 22 in consideration of thermal expansion of the cylindrical portion 1a.
Further, an adhesive 2 is provided between the conical part 9 and the cylindrical part 10.
4 and fix both.
しかしながら、実際には円筒部１０と円筒部１
ａとの間の隙間から湯が段部２１と段部２２との
間へ流れ込み、この部分の湯が先に固まると、円
筒部１ａの熱膨張による軸方向の伸びが妨げら
れ、円筒部１ａが符号１５で示すように、割れて
湯が中子１の内部へ洩れることがある。 However, in reality, the cylindrical part 10 and the cylindrical part 1
When hot water flows into the space between the stepped portions 21 and 22 from the gap between the stepped portions 21 and 22, and the hot water in this portion solidifies first, the axial expansion due to thermal expansion of the cylindrical portion 1a is hindered, and the cylindrical portion 1a As shown by reference numeral 15, the core 1 may crack and hot water may leak into the interior of the core 1.
そこで、本発明の目的はこのような問題に鑑
み、中子の組合せ面から湯の洩れを防止するとと
もに、中子の熱膨張による割れを防止するように
した砂型を得ることにある。 SUMMARY OF THE INVENTION In view of these problems, it is an object of the present invention to provide a sand mold that prevents the leakage of hot water from the mating surface of the core and prevents the core from cracking due to thermal expansion.
本発明の他の目的は、従来の鋳型に何ら変更を
加えることなく実施することができる砂型を得る
ことにある。 Another object of the invention is to obtain a sand mold that can be implemented without any modification to conventional molds.
このため、本発明は中子の端部に長手方向軸線
に対して直角をなす環状の段部を形成し、該段部
とこれに対向する砂型本体の中空部の段部との間
に、前記中子の熱膨張を吸収する厚さをもつ紙な
どの圧縮性材料からなるシールパツキングを介装
することによつて、湯洩れを防止しかつ中子の熱
膨張を吸収するようにしたものである。 For this purpose, the present invention forms an annular step at a right angle to the longitudinal axis at the end of the core, and between the step and the opposite step in the hollow part of the sand mold body, By interposing a seal packing made of a compressible material such as paper with a thickness that absorbs the thermal expansion of the core, leakage of hot water is prevented and the thermal expansion of the core is absorbed. It is something.
本発明を実施例に基づいて説明すると、第３図
に示すように、シールパツキング２０を密封を要
する部分、すなわち段部２１と段部２２の間に装
着する。レール中子３とクランクケース中子１の
円錐部１ｂとの間には、格別接着材を用いなくて
よい。 The present invention will be described based on an embodiment. As shown in FIG. 3, a seal packing 20 is installed between a portion that requires sealing, that is, a step portion 21 and a step portion 22. There is no need to use any special adhesive between the rail core 3 and the conical portion 1b of the crankcase core 1.
上述のように、シールパツキング２０を装着す
ることによつて、クランクケース中子１は注湯に
より周囲を溶湯に囲まれると、熱膨張を生じる。
この熱膨張は段部２１と段部２２の間に予め設け
た隙間ｓによつて吸収される。すなわち、クラン
クケース中子１が軸方向に熱膨脹すると、段部２
２によつてシールパツキング２０が圧縮される。
そして、円筒部１０と円筒部１ａとの間の隙間か
ら溶湯が浸入しても、シールパツキング２０によ
つてせき止められ、段部２１と段部２２の間には
浸入し得ない。 As described above, by installing the seal packing 20, when the crankcase core 1 is surrounded by molten metal due to pouring, thermal expansion occurs.
This thermal expansion is absorbed by the gap s provided in advance between the stepped portions 21 and 22. That is, when the crankcase core 1 thermally expands in the axial direction, the stepped portion 2
2 compresses the seal packing 20.
Even if the molten metal enters from the gap between the cylindrical portion 10 and the cylindrical portion 1a, it is blocked by the seal packing 20 and cannot enter between the stepped portions 21 and 22.
紙などからなるシールパツキング２０は鋳型の
内部が酸素乏状態となつているので、溶湯によつ
て燃え出すことはなく、炭化して固形化するが、
シール性を損なうことはない。 The seal packing 20 made of paper or the like has an oxygen-poor condition inside the mold, so it will not burn out due to the molten metal and will carbonize and solidify.
It does not impair sealing performance.
シールパツキング２０は軟質の紙またはパルプ
が値段の点で実用的であるが、他の適当な材料を
用いることができる。 For the seal packing 20, soft paper or pulp is practical from a cost standpoint, but other suitable materials may be used.
本発明によれば、中子の組合せ部に介装したシ
ールパツキングが、中子の熱膨張に対しこれを吸
収するクツシヨン効果と、溶湯を中子の組合せ部
の隙間へ流入させないというシール効果を発揮す
る。したがつて、従来に比べて鋳バリの発生を大
幅に抑える効果ができるばかりでなく、中子の熱
膨脹による割れを防止することができるという優
れた効果が得られる。 According to the present invention, the seal packing interposed in the combined part of the core has a cushioning effect that absorbs thermal expansion of the core, and a sealing effect that prevents molten metal from flowing into the gap between the combined part of the core. demonstrate. Therefore, compared to the conventional method, not only can the occurrence of casting burrs be significantly suppressed, but also the excellent effect of preventing cracking due to thermal expansion of the core can be obtained.
第１図は中子を使用する鋳型の一般的な組合せ
状態を示す側面断面図、第２図は同鋳型における
注湯の状態を示す部分断面図、第３図は本発明に
係る砂型についての第２図と同様の断面図であ
る。
Ａ：ヘツド取付部、Ｂ：シリンダ部、Ｃ：クラ
ンクケース部、１：クランクケース中子、１ａ：
円筒部、１ｂ：円錐部、３：レール中子、４，
５：くさび、６：中子、７，８：砂、９：円錐
部、１０：円筒部、１２，１３：型枠、１４：円
筒部、２０：シールパツキング、２１，２２：段
部。
Fig. 1 is a side sectional view showing a general assembled state of a mold using a core, Fig. 2 is a partial sectional view showing the state of pouring in the same mold, and Fig. 3 is a side sectional view showing the state of pouring in the same mold. FIG. 2 is a cross-sectional view similar to FIG. 2; A: Head mounting part, B: Cylinder part, C: Crankcase part, 1: Crankcase core, 1a:
Cylindrical part, 1b: Conical part, 3: Rail core, 4,
5: Wedge, 6: Core, 7, 8: Sand, 9: Conical part, 10: Cylindrical part, 12, 13: Formwork, 14: Cylindrical part, 20: Seal packing, 21, 22: Step part.
Claims (1)
す環状の段部を形成し、該段部とこれに対向する
砂型本体の中空部の段部との間に、前記中子の熱
膨張を吸収する厚さをもつ紙などの圧縮性材料か
らなるシールパツキングを介装することによつ
て、湯洩れを防止しかつ中子の熱膨張を吸収する
ようにした砂型。1. An annular step is formed at the end of the core at right angles to the longitudinal axis, and between the step and the opposite step in the hollow part of the sand mold body, the heat of the core is A sand mold that prevents leakage and absorbs thermal expansion of the core by interposing a seal packing made of compressible material such as paper with a thickness that absorbs expansion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11973181A JPS5820348A (en) | 1981-07-30 | 1981-07-30 | Sand mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11973181A JPS5820348A (en) | 1981-07-30 | 1981-07-30 | Sand mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5820348A JPS5820348A (en) | 1983-02-05 |
| JPS6260181B2 true JPS6260181B2 (en) | 1987-12-15 |
Family
ID=14768723
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11973181A Granted JPS5820348A (en) | 1981-07-30 | 1981-07-30 | Sand mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5820348A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0576277U (en) * | 1991-03-19 | 1993-10-19 | 修一 佐古田 | Spiral float |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60112933A (en) * | 1983-11-22 | 1985-06-19 | Motonosuke Arai | Joint for tubular underground structure |
| JPS6340283Y2 (en) * | 1984-12-07 | 1988-10-21 | ||
| US4774990A (en) * | 1986-08-04 | 1988-10-04 | Mazda Motor Corporation | High pressure casting method and a casting core |
| JPH04220139A (en) * | 1990-08-08 | 1992-08-11 | Hitachi Metals Ltd | Mold, core and core box |
-
1981
- 1981-07-30 JP JP11973181A patent/JPS5820348A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0576277U (en) * | 1991-03-19 | 1993-10-19 | 修一 佐古田 | Spiral float |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5820348A (en) | 1983-02-05 |
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