JP3623194B2 - Support structure for sand core for cylinder block - Google Patents

Support structure for sand core for cylinder block Download PDF

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Publication number
JP3623194B2
JP3623194B2 JP2001394153A JP2001394153A JP3623194B2 JP 3623194 B2 JP3623194 B2 JP 3623194B2 JP 2001394153 A JP2001394153 A JP 2001394153A JP 2001394153 A JP2001394153 A JP 2001394153A JP 3623194 B2 JP3623194 B2 JP 3623194B2
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Japan
Prior art keywords
sand core
cylinder block
mold
support structure
pin member
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 - Fee Related
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JP2001394153A
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JP2003191050A (en
Inventor
哲司 梅本
信 永田
賢治 大和田
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、シリンダブロックを鋳造するための金型内に配設され、前記シリンダブロックの壁面にウォータジャケットを形成するためのシリンダブロック用砂中子の支持構造に関する。
【０００２】
【従来の技術】
一般的に、内燃機関を構成するシリンダブロックは、高圧鋳造により製造されている。この高圧鋳造において、シリンダブロックの壁面にウォータジャケットを形成するために、シリンダブロック用砂中子が用いられている。
【０００３】
この種の砂中子を金型内に位置決め支持するために、従来より種々の提案がなされており、例えば、特開平９−２７１９２４号公報に開示された技術が知られている。上記の従来技術は、図５に示すように、固定ダイス１と、スライド中子２ａ、２ｂと、スライドコア３とを備えており、これらの間にシリンダブロック用キャビティ４が形成されるとともに、前記キャビティ４に砂中子５が配設されている。
【０００４】
スライドコア３の端面３ａは、砂中子５の端面５ａに隙間なく当接してウォータジャケット端部の窓部を構成している。スライドコア３の端面３ａからキャビティ４側に向かって砂中子保持用突起６が突出しており、この砂中子保持用突起６が、砂中子５の端面５ａから内方に形成された保持穴７に挿入される。これにより、砂中子５は、キャビティ４内に位置決め保持されることになる。
【０００５】
【発明が解決しようとする課題】
しかしながら、上記の従来技術では、金型であるスライドコア３に設けられた砂中子保持用突起６が砂中子５の保持穴７に挿入されるため、この保持穴７の周囲に割れや損傷が発生し易い。このため、砂中子５の位置決め精度が低下し易くなり、良好なウォータジャケットを有するシリンダブロックを効率的に鋳造することが困難になるという問題が指摘されている。
【０００６】
本発明はこの種の問題を解決するものであり、砂中子の損傷を確実に阻止することができ、高精度なシリンダブロックを効率的に鋳造することが可能なシリンダブロック用砂中子の支持構造を提供することを目的とする。
【０００７】
【課題を解決するための手段】
本発明に係るシリンダブロック用砂中子の支持構造では、シリンダブロックを鋳造するための金型内に配設され、前記シリンダブロックの壁面にウォータジャケットを形成する砂中子を、前記金型内に支持するためのシリンダブロック用砂中子の支持構造であって、前記砂中子には、前記シリンダブロックを構成するシリンダボアの軸方向に平行して脚部が設けられ、前記脚部に係合穴が形成され、前記係合穴にウォータジャケット端部の窓部形成用ピン部材が装着され、前記シリンダブロックのシリンダボア側と反対側に巾木部が形成されるとともに、前記巾木部の周囲には、溶湯の流れを許容する湯廻し部が設けられ、前記金型には、前記巾木部に係合して前記砂中子を支持する支持ピンを設け、前記砂中子を位置決め支持する際、前記係合穴に、前記ピン部材が挿入され、且つ該ピン部材は該金型に形成された凹部に３点で外接することを特徴とする。
【０００９】
これにより、砂中子に装着されているピン部材を、金型の凹部に係合させるだけで、前記砂中子をキャビティに対して正確に位置決め支持することが可能になる。従って、砂中子の損傷を阻止するとともに、前記砂中子の位置決め精度が向上し、ウォータジャケットを有するシリンダブロックを効率的かつ高精度に鋳造することができる。
【００１０】
【発明の実施の形態】
図１は、本発明の実施形態に係るシリンダブロック用砂中子の支持構造１０を組み込む金型１２の一部断面説明図である。
【００１１】
金型１２は、固定型１４と、中間可動型１６ａ、１６ｂと、可動型１８とを備え、前記固定型１４にボアピン２０が設けられる。このボアピン２０にスリーブ２２が外装されることにより、金型１２内にシリンダブロック用キャビティ２４が形成される。キャビティ２４には、支持構造１０を構成する第１および第２支持部２６、２８を介してシリンダブロック３０のウォータジャケット３２を形成するための砂中子３４が配置される。
【００１２】
砂中子３４は、図１および図２に示すように、シリンダブロック３０の各シリンダボア３６を囲繞し、第１支持部２６を構成する複数個の脚部３８と、砂中子本体４０とを一体的に設けている。砂中子本体４０のシリンダボア３６とは反対の側面（外面）４２ａには、所定の位置に第２支持部２８を構成する巾木部４４が形成される。
【００１３】
脚部３８は、シリンダボア３６の軸方向に平行しており、図１に示すように、所定の脚部３８の先端面から所定の深さまで係合穴４６が形成される。各係合穴４６には、ウォータジャケット３２の端部に窓部を形成するためのピン部材４８が挿入される。ピン部材４８は、例えば、アルミニウムで構成されており、係合穴４６に嵌合する円柱部５０と、脚部３８の先端面に当接する頭部５２とを一体的に設ける。
【００１４】
可動型１８には、図３に示すように、ピン部材４８の頭部５２を収容するための略三角形状の凹部５４が形成されている。この凹部５４は、３つの壁面５６ａ、５６ｂおよび５６ｃにより構成されており、前記壁面５６ａ〜５６ｃには、頭部５２が接触点５８ａ〜５８ｃの３点で接触支持される。
【００１５】
図２に示すように、巾木部４４は、側面４２ａから所定の長さだけ突出する略半リング状に構成されている。図１に示すように、砂中子３４がキャビティ２４に配置された状態で、巾木部４４と中間可動型１６ａ、１６ｂとの間には、溶湯の流れを許容する湯廻し部６２が設けられる。
【００１６】
中間可動型１６ａ、１６ｂには、砂中子３４を支持する支持ピン６４が湯廻し部６２に対応して、溶接、あるいはネジ止めにより固定されている。支持ピン６４には、中間可動型１６ａ、１６ｂと同一の材質で形成されるとともに、前記中間可動型１６ａ、１６ｂに固定される台座部６６と、砂中子３４の巾木部４４に係合する円柱部６８とから一体的に構成される。
【００１７】
このように構成される砂中子３４および支持構造１０の動作について、以下に説明する。
【００１８】
まず、図１に示すように、金型１２が型締めされた状態で、例えば、溶融アルミニウム等の溶湯が図示しないランナおよびゲートを介してキャビティ２４内に充填される。そして、キャビティ２４内の溶湯が８５ＭＰａ〜１００ＭＰａ程度の圧力で高圧鋳造され、前記溶湯の凝固が開始される。
【００１９】
その際、砂中子３４にも高圧力が作用して、前記砂中子３４が収縮する。具体的には、図４に示すように、砂中子３４のシリンダボア３６側の面４２ｂには、外方に向かって鋳造圧力Ｆ１が作用する一方、前記砂中子３４の前記シリンダボア３６側とは反対側の側面４２ａには、内方に向かって鋳造圧力Ｆ１が作用している。
【００２０】
この場合、第２支持部２８では、砂中子３４の巾木部４４には、溶湯の流れを許容する湯廻し部６２が設けられるとともに、中間可動型１６ａ、１６ｂには、前記湯廻し部６２に対応して前記巾木部４４に係合する支持ピン６４が設けられている。
【００２１】
このため、砂中子３４の側面４２ａには、略全面にわたって均等な鋳造圧力Ｆ１が作用し、この鋳造圧力Ｆ１は、前記砂中子３４の面４２ｂに作用する鋳造圧力Ｆ１と釣り合っている。従って、砂中子３４が部分的に変形することを確実に阻止することができる。
【００２２】
一方、第１支持部２６では、脚部３８に形成された係合穴４６にピン部材４８が挿入されており、このピン部材４８の頭部５２が、可動型１８の凹部５４に収容されている。その際、図３に示すように、頭部５２は、凹部５４の３つの壁面５６ａ〜５６ｃに対して接触点５８ａ〜５８ｃの３点で接触支持されている。
【００２３】
これにより、脚部３８を凹部５４に対して容易かつ確実に位置決め支持することができ、砂中子３４をキャビティ２４に高精度に位置決めすることが可能になる。しかも、脚部３８に金属製（例えば、アルミニウム製）のピン部材４８が予め装着されており、このピン部材４８の頭部５２を凹部５４に係合させている。このため、金型側に設けられた突起を砂中子５に挿入してこの砂中子５の位置決めを行う従来構成に比べ、砂中子３４の割れや損傷等の発生を有効に阻止することができる。
【００２４】
従って、本実施形態では、所望の形状のウォータジャケット３２を有するシリンダブロック３０を、効率的かつ高精度に製造することができるという効果が得られる。
【００２５】
【発明の効果】
本発明に係るシリンダブロック用砂中子の支持構造では、脚部に形成された係合穴には、ウォータジャケット端部の窓部形成用ピン部材が装着されているため、砂中子をキャビティに配置する際に、この砂中子に金型側の突起を挿入する必要がなく、前記砂中子の損傷を確実に阻止することができる。
【００２６】
また、本発明に係るシリンダブロック用砂中子の支持構造では、砂中子に装着されているピン部材を、金型に形成された凹部に係合させるだけで、前記砂中子をキャビティに対して正確に位置決め支持することが可能になる。従って、砂中子の損傷を阻止するとともに、前記砂中子の位置決め精度が向上し、ウォータジャケットを有するシリンダブロックを、効率的かつ高精度に鋳造することができる。
【図面の簡単な説明】
【図１】本発明の実施形態に係るシリンダブロック用砂中子の支持構造を組み込む金型の一部断面説明図である。
【図２】前記金型内に配置される前記砂中子の概略斜視説明図である。
【図３】前記支持構造を構成する第１支持部の平面説明図である。
【図４】前記金型内で前記砂中子に鋳造圧力が作用する際の説明図である。
【図５】従来技術に係る砂中子の保持装置の概略説明図である。
【符号の説明】
１０…支持構造 １２…金型
１４…固定型 １６ａ、１６ｂ…中間可動型
１８…可動型 ２０…ボアピン
２２…スリーブ ２４…キャビティ
２６、２８…支持部 ３０…シリンダブロック
３２…ウォータジャケット ３４…砂中子
３６…シリンダボア ３８…脚部
４０…砂中子本体 ４４…巾木部
４６…係合穴 ４８…ピン部材
５０…円柱部 ５２…頭部
５４…凹部 ５６ａ〜５６ｃ…壁面
５８ａ〜５８ｃ…接触点 ６２…湯廻し部
６４…支持ピン[0001]
BACKGROUND OF THE INVENTION
The present invention is disposed in a mold for casting the cylinder block, it relates to a support structure of a cylinder block for sand in children for forming a water jacket on the wall of the cylinder block.
[0002]
[Prior art]
Generally, a cylinder block constituting an internal combustion engine is manufactured by high pressure casting. In this high pressure casting, a sand core for cylinder block is used to form a water jacket on the wall surface of the cylinder block.
[0003]
In order to position and support this type of sand core in the mold, various proposals have been conventionally made. For example, a technique disclosed in Japanese Patent Laid-Open No. 9-271924 is known. As shown in FIG. 5, the above-described prior art includes a fixed die 1, slide cores 2 a and 2 b, and a slide core 3, and a cylinder block cavity 4 is formed between them, A sand core 5 is disposed in the cavity 4.
[0004]
The end surface 3a of the slide core 3 is in contact with the end surface 5a of the sand core 5 without a gap, thereby forming a window portion at the end of the water jacket. A sand core holding projection 6 protrudes from the end surface 3 a of the slide core 3 toward the cavity 4, and the sand core holding projection 6 is formed inward from the end surface 5 a of the sand core 5. It is inserted into the hole 7. As a result, the sand core 5 is positioned and held in the cavity 4.
[0005]
[Problems to be solved by the invention]
However, in the above prior art, the sand core holding projection 6 provided on the slide core 3 which is a mold is inserted into the holding hole 7 of the sand core 5. Damage is likely to occur. For this reason, it has been pointed out that the positioning accuracy of the sand core 5 tends to be lowered, and it becomes difficult to efficiently cast a cylinder block having a good water jacket.
[0006]
The present invention has been made to solve this kind of problem, it is possible to reliably prevent damage to the sand core, the cylinder block sand in the child capable of casting a high-precision cylinder block efficiently The object is to provide a support structure.
[0007]
[Means for Solving the Problems]
In the structure for supporting a sand core for a cylinder block according to the present invention, a sand core that is disposed in a mold for casting the cylinder block and forms a water jacket on the wall surface of the cylinder block is disposed inside the mold. The sand core is supported by a sand block, and the sand core is provided with a leg portion parallel to an axial direction of a cylinder bore constituting the cylinder block. A joint hole is formed, a window member forming pin member at the end of the water jacket is attached to the engagement hole, a base plate portion is formed on the side opposite to the cylinder bore side of the cylinder block, and the base plate portion Around the periphery is provided a hot water circulating part that allows the flow of molten metal, and the mold is provided with a support pin that engages with the baseboard part to support the sand core, and positions the sand core. When supporting The Goana, the pin member is inserted, and the pin member is characterized by circumscribing at three points in a recess formed on the mold.
[0009]
As a result, the sand core can be accurately positioned and supported with respect to the cavity only by engaging the pin member mounted on the sand core with the concave portion of the mold. Accordingly, the sand core is prevented from being damaged, the positioning accuracy of the sand core is improved, and the cylinder block having the water jacket can be cast efficiently and with high accuracy.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a partial cross-sectional explanatory view of a mold 12 incorporating a support structure 10 for a cylinder block sand core according to an embodiment of the present invention.
[0011]
The mold 12 includes a fixed mold 14, intermediate movable molds 16 a and 16 b, and a movable mold 18, and a bore pin 20 is provided on the fixed mold 14. A cylinder block cavity 24 is formed in the mold 12 by covering the bore pin 20 with a sleeve 22. A sand core 34 for forming the water jacket 32 of the cylinder block 30 is disposed in the cavity 24 via the first and second support portions 26 and 28 constituting the support structure 10.
[0012]
As shown in FIGS. 1 and 2, the sand core 34 surrounds each cylinder bore 36 of the cylinder block 30, and includes a plurality of legs 38 constituting the first support portion 26, and the sand core body 40. Provided integrally. On the side surface (outer surface) 42a opposite to the cylinder bore 36 of the sand core body 40, a baseboard portion 44 constituting the second support portion 28 is formed at a predetermined position.
[0013]
The leg portion 38 is parallel to the axial direction of the cylinder bore 36, and as shown in FIG. 1, an engagement hole 46 is formed from the distal end surface of the predetermined leg portion 38 to a predetermined depth. A pin member 48 for forming a window at the end of the water jacket 32 is inserted into each engagement hole 46. The pin member 48 is made of, for example, aluminum, and integrally includes a columnar portion 50 that fits into the engagement hole 46 and a head portion 52 that abuts against the distal end surface of the leg portion 38.
[0014]
As shown in FIG. 3, the movable mold 18 is formed with a substantially triangular recess 54 for accommodating the head 52 of the pin member 48. The recess 54 is constituted by three wall surfaces 56a, 56b and 56c, and the head 52 is contacted and supported by the wall surfaces 56a to 56c at three points of contact points 58a to 58c.
[0015]
As shown in FIG. 2, the baseboard portion 44 is configured in a substantially half ring shape that protrudes from the side surface 42 a by a predetermined length. As shown in FIG. 1, in the state where the sand core 34 is disposed in the cavity 24, a hot water circulating portion 62 that allows the flow of molten metal is provided between the baseboard portion 44 and the intermediate movable dies 16a and 16b. It is done.
[0016]
A support pin 64 that supports the sand core 34 is fixed to the intermediate movable dies 16a and 16b by welding or screwing corresponding to the hot water runner 62. The support pin 64 is formed of the same material as the intermediate movable molds 16a and 16b, and engages with a pedestal 66 that is fixed to the intermediate movable molds 16a and 16b and the baseboard 44 of the sand core 34. It is comprised integrally from the cylindrical part 68 to do.
[0017]
Operations of the sand core 34 and the support structure 10 configured as described above will be described below.
[0018]
First, as shown in FIG. 1, in a state where the mold 12 is clamped, for example, a molten metal such as molten aluminum is filled into the cavity 24 via a runner and a gate (not shown). Then, the molten metal in the cavity 24 is high-pressure cast at a pressure of about 85 MPa to 100 MPa, and solidification of the molten metal is started.
[0019]
At that time, a high pressure acts on the sand core 34 and the sand core 34 contracts. Specifically, as shown in FIG. 4, a casting pressure F <b> 1 acts on the surface 42 b of the sand core 34 on the cylinder bore 36 side toward the outside, while the sand core 34 has a side facing the cylinder bore 36 side. The casting pressure F1 is acting inward on the opposite side surface 42a.
[0020]
In this case, in the second support portion 28, the baseboard portion 44 of the sand core 34 is provided with a hot water supply portion 62 that allows the flow of molten metal, and the intermediate movable dies 16a and 16b have the hot water supply portion. Corresponding to 62, a support pin 64 that engages with the baseboard portion 44 is provided.
[0021]
Therefore, a uniform casting pressure F1 acts on the side surface 42a of the sand core 34 over substantially the entire surface, and this casting pressure F1 is balanced with the casting pressure F1 acting on the surface 42b of the sand core 34. Therefore, partial deformation of the sand core 34 can be reliably prevented.
[0022]
On the other hand, in the first support portion 26, the pin member 48 is inserted into the engagement hole 46 formed in the leg portion 38, and the head 52 of the pin member 48 is accommodated in the concave portion 54 of the movable mold 18. Yes. At that time, as shown in FIG. 3, the head 52 is supported by contact with the three wall surfaces 56 a to 56 c of the recess 54 at three points of contact points 58 a to 58 c.
[0023]
As a result, the leg portion 38 can be easily and reliably positioned and supported with respect to the concave portion 54, and the sand core 34 can be positioned in the cavity 24 with high accuracy. In addition, a metal (for example, aluminum) pin member 48 is mounted in advance on the leg portion 38, and the head 52 of the pin member 48 is engaged with the recess 54. For this reason, compared with the conventional configuration in which the protrusion provided on the mold side is inserted into the sand core 5 to position the sand core 5, the occurrence of cracks and damage of the sand core 34 is effectively prevented. be able to.
[0024]
Therefore, in this embodiment, the effect that the cylinder block 30 which has the water jacket 32 of a desired shape can be manufactured efficiently and with high precision is acquired.
[0025]
【The invention's effect】
In the sand core support structure for a cylinder block according to the present invention, since the pin member for forming the window portion at the end of the water jacket is mounted in the engagement hole formed in the leg portion, the sand core is Therefore, it is not necessary to insert a protrusion on the mold side into the sand core, and damage to the sand core can be reliably prevented.
[0026]
Further, in the sand core support structure for a cylinder block according to the present invention, the sand core can be made into the cavity only by engaging the pin member mounted on the sand core with the recess formed in the mold. On the other hand, it is possible to accurately support the positioning. Therefore, the sand core is prevented from being damaged, the positioning accuracy of the sand core is improved, and the cylinder block having the water jacket can be cast efficiently and with high accuracy.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional explanatory view of a mold incorporating a support structure for a cylinder block sand core according to an embodiment of the present invention.
FIG. 2 is a schematic perspective view of the sand core disposed in the mold.
FIG. 3 is an explanatory plan view of a first support portion constituting the support structure.
FIG. 4 is an explanatory view when casting pressure acts on the sand core in the mold.
FIG. 5 is a schematic explanatory diagram of a sand core holding device according to the prior art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Support structure 12 ... Mold 14 ... Fixed type 16a, 16b ... Intermediate movable type 18 ... Movable type 20 ... Bore pin 22 ... Sleeve 24 ... Cavity 26, 28 ... Support part 30 ... Cylinder block 32 ... Water jacket 34 ... In sand Child 36 ... Cylinder bore 38 ... Leg 40 ... Sand core body 44 ... Baseboard 46 ... Engagement hole 48 ... Pin member 50 ... Cylindrical part 52 ... Head 54 ... Recess 56a-56c ... Wall surface 58a-58c ... Contact point 62 ... Hot watering part 64 ... Support pin

Claims (1)

シリンダブロックを鋳造するための金型内に配設され、
前記シリンダブロックの壁面にウォータジャケットを形成する砂中子を、前記金型内に支持するためのシリンダブロック用砂中子の支持構造であって、
前記砂中子には、
前記シリンダブロックを構成するシリンダボアの軸方向に平行して脚部が設けられ、
前記脚部に係合穴が形成され、前記係合穴にウォータジャケット端部の窓部形成用ピン部材が装着され、
前記シリンダブロックのシリンダボア側と反対側に巾木部が形成されるとともに、
前記巾木部の周囲には、溶湯の流れを許容する湯廻し部が設けられ、
前記金型には、
前記巾木部に係合して前記砂中子を支持する支持ピンを設け、
前記砂中子を位置決め支持する際、前記係合穴に、前記ピン部材が挿入され、且つ該ピン部材は該金型に形成された凹部に３点で外接することを特徴とするシリンダブロック用砂中子の支持構造。Arranged in a mold for casting the cylinder block,
A sand core for forming a water jacket on the wall surface of the cylinder block is a support structure for a sand core for a cylinder block for supporting the sand core in the mold,
In the sand core,
Legs are provided in parallel with the axial direction of the cylinder bores constituting the cylinder block,
The engagement Goana is formed in the leg portion, a window portion forming pin member of the water jacket end is attached to the engagement hole,
A baseboard portion is formed on the side opposite to the cylinder bore side of the cylinder block,
Around the baseboard part, a hot water circulating part that allows the flow of molten metal is provided,
In the mold,
Provide a support pin that engages with the baseboard and supports the sand core,
Wherein when the sand core is positioned and supported, the engagement hole, the pin member is inserted, and the cylinder block the pin member is characterized that you circumscribing at three points in a recess formed in the mold Support structure for sand core.
JP2001394153A 2001-12-26 2001-12-26 Support structure for sand core for cylinder block Expired - Fee Related JP3623194B2 (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
JP2001394153A JP3623194B2 (en) 2001-12-26 2001-12-26 Support structure for sand core for cylinder block

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JP3623194B2 true JP3623194B2 (en) 2005-02-23

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JP4486641B2 (en) * 2006-12-28 2010-06-23 本田技研工業株式会社 Core, casting method and casting mold
JP5059727B2 (en) * 2008-09-30 2012-10-31 本田技研工業株式会社 Core support structure
CN104325087A (en) * 2014-10-24 2015-02-04 江苏武蕾机械有限公司 Water suffocating hole-free casting process for cylinder cover of single cylinder diesel engine and sand core for casting process
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