JP2012148291A

JP2012148291A - Casting mold

Info

Publication number: JP2012148291A
Application number: JP2011007414A
Authority: JP
Inventors: Kengo Otsuka; 健悟大塚; Hiromi Fujita; 博己藤田; Atsushi Yamashita; 敦史山下; Kazuhiro Hayashi; 和弘林; Takeshi Wake; 健和氣
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2011-01-18
Filing date: 2011-01-18
Publication date: 2012-08-09

Abstract

PROBLEM TO BE SOLVED: To provide a casting mold in which production of burrs can be suppressed.SOLUTION: In the casting mold including degassing runners, in the case when a plurality of degassing runners 11, 12, 13, 14 are joined, the cross-sectional areas of the degassing runners 15, 16 after the joining are made smaller than the total of the cross-sectional areas of the respective degassing runners 11, 12, 13, 14 before the joining. The cross-sectional areas of the degassing runners 15, 16 after the joining decided by depth and width are set by adjusting the width while fixedly retaining the depth. The cross-sectional areas of the degassing runners 15, 16 after the joining are preferably 0.6 to 0.9 time the total of the cross-sectional areas of the respective degassing runners 11, 12, 13, 14 before the joining.

Description

本発明は、複数のガス抜きランナを備えた鋳造用金型に関する。 The present invention relates to a casting mold having a plurality of venting runners.

ダイキャストにおいては、キャビティに溶湯を充填する際に、背圧が掛からないようにするため、ガス抜きランナを設けて、キャビティ内のガス（空気）をキャビティ外へ排出することが知られている。また、溶湯がガス抜きランナを通過する速度が速いと、チルベント周辺でバリが発生する虞があることから、充填時間が延びても品質に悪影響を及ぼさない範囲で溶湯の通過速度を下げるようにしている。 In die casting, it is known that a gas vent runner is provided to discharge gas (air) from the cavity to the outside of the cavity in order to prevent back pressure from being applied when the melt is filled in the cavity. . In addition, if the speed at which the molten metal passes through the degassing runner is high, burrs may occur around the chill vent, so the molten metal speed should be reduced within a range that does not adversely affect quality even if the filling time is extended. ing.

特許文献１には、キャビティ内のガスをキャビティ全周から均一に外部へ排出するために、キャビティとガス抜き通路を連通するゲートの断面積が吸引源から遠のくにつれて大きくなるように形成することが開示されている。 In Patent Document 1, in order to uniformly discharge the gas in the cavity from the entire circumference of the cavity to the outside, it is formed so that the cross-sectional area of the gate communicating with the cavity and the gas vent passage increases as the distance from the suction source increases. It is disclosed.

特開平２−１５４６号公報JP-A-2-1546

しかし、特許文献１に記載の技術においては、吸引源から遠のくにつれてガス抜き断面積が大きくなると、各ガス抜き断面積が変化してしまうため、溶湯の通過速度が各ガス抜きでバラバラになり、溶湯を同時且つ均一にキャビティに充填することができない。また、吸引源から遠のくにつれてガス抜き断面積が大きくなるように形成されていると、溶湯がガス抜きランナを通過する際に、断面積が小さくなるにつれて溶湯の通過速度が速くなり、バリが発生する虞がある。更に、溶湯の通過速度が速いまま合流すると、サージ圧によりバリが発生してしまうという問題がある。 However, in the technique described in Patent Document 1, when the gas vent cross-sectional area increases as the distance from the suction source increases, each gas vent cross-sectional area changes, so that the passing speed of the molten metal varies with each gas vent, The molten metal cannot be filled into the cavity simultaneously and uniformly. Also, if the cross-sectional area of the gas vent is increased as the distance from the suction source increases, when the molten metal passes through the gas vent runner, the passage speed of the molten metal increases as the cross-sectional area decreases, and burrs are generated. There is a risk of doing. Furthermore, if the molten metal merges while the passage speed is high, there is a problem that burrs are generated due to surge pressure.

本発明は、従来の技術が有するこのような問題点に鑑みてなされたものであり、その目的とするところは、バリの発生を抑制することができる鋳造用金型を提供しようとするものである。 The present invention has been made in view of such problems of the prior art, and an object of the present invention is to provide a casting mold capable of suppressing the generation of burrs. is there.

上記課題を解決すべく本発明は、ガス抜きランナを備えた鋳造用金型において、複数のガス抜きランナを合流させる場合に、合流前の各ガス抜きランナの断面積の合計よりも、合流後のガス抜きランナの断面積を小さくしたものである。 In order to solve the above problems, the present invention provides a casting mold equipped with a venting runner, when joining a plurality of venting runners, after joining the sum of the sectional areas of the venting runners before joining. The sectional area of the degassing runner is reduced.

深さと幅で決まる前記合流後のガス抜きランナの断面積は、深さを一定に保ったまま幅を調整することにより設定することができる。 The cross-sectional area of the degassing runner after merging determined by the depth and width can be set by adjusting the width while keeping the depth constant.

また、前記合流後のガス抜きランナの断面積は、前記合流前の各ガス抜きランナの断面積の合計の０．６〜０．９倍であることが望ましい。 Moreover, it is preferable that the cross-sectional area of the degassing runner after merging is 0.6 to 0.9 times the total cross-sectional area of each degassing runner before merging.

本発明によれば、合流前の各ガス抜きランナの断面積の合計よりも、合流後のガス抜きランナの断面積を小さくしたので、バリが発生することなく製品の品質が向上する。バリが発生しないので、連続鋳造が可能になり稼働率が向上する。更に、バリによる金型の損傷が発生しないので、金型のメンテナンス工数も削減することができる。 According to the present invention, since the cross-sectional area of the degassing runner after merging is made smaller than the sum of the cross-sectional areas of the degassing runners before merging, the quality of the product is improved without generating burrs. Since burrs do not occur, continuous casting becomes possible and the operating rate is improved. Furthermore, since the mold is not damaged by burrs, the number of mold maintenance steps can be reduced.

また、合流後のガス抜きランナの断面積を、深さを一定に保ったまま幅を調整して設定すれば、ガス抜きランナの表面積を増やすことによりガス抜きランナの抜熱量を増やし、ガス抜きランナを通過中の溶湯の凝固を促進させてバリの発生を防ぐことができる。 In addition, if the cross-sectional area of the degassing runner after merging is set by adjusting the width while keeping the depth constant, increasing the heat removal amount of the degassing runner by increasing the surface area of the degassing runner, It is possible to prevent the occurrence of burrs by promoting solidification of the molten metal passing through the runner.

また、合流後のガス抜きランナの断面積は、合流前の各ガス抜きランナの断面積の合計の０．６〜０．９倍にすれば、合流後のガス抜きランナを通過する溶湯の速度が急激に上昇することがないので、バリの発生を抑制することができる。 Moreover, if the cross-sectional area of the degassing runner after merging is 0.6 to 0.9 times the total cross-sectional area of each degassing runner before merging, the speed of the melt passing through the degassing runner after merging Does not rise rapidly, so that the generation of burrs can be suppressed.

本発明に係る鋳造用金型の概要断面図Outline sectional view of casting mold according to the present invention 可動型の概要平面図Movable outline plan view 合流前のガス抜きランナの断面図Cross section of degassing runner before merging 合流後のガス抜きランナの断面図Cross section of degassing runner after merging

以下に本発明の実施の形態を添付図面に基づいて説明する。本発明に係る鋳造用金型１は、図１に示すように、固定型２と可動型３からなり、固定型２と可動型３を合わせることでキャビティ４、オーバフロー５、ガス抜き手段６やゲート７などが形成される。また、固定型２にはスリーブ８が設けられている。鋳造用金型１は、同一形状の製品を同一品質で２個取りできるよう形成されている。 Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, a casting mold 1 according to the present invention comprises a fixed mold 2 and a movable mold 3. By combining the fixed mold 2 and the movable mold 3, a cavity 4, an overflow 5, a gas venting means 6, A gate 7 and the like are formed. The fixed mold 2 is provided with a sleeve 8. The casting mold 1 is formed so that two products of the same shape can be obtained with the same quality.

ガス抜き手段６は、図２に示すように、一方の１つの製品（キャビティ４）について４つのガス抜きランナ１１，１２，１３，１４を設け、ガス抜きランナ１１とガス抜きランナ１２を合流させてガス抜きランナ１５とし、ガス抜きランナ１３とガス抜きランナ１４を合流させてガス抜きランナ１６として構成されている。更に、ガス抜きランナ１５とガス抜きランナ１６は、夫々チルベント１７に接続されている。 As shown in FIG. 2, the degassing means 6 is provided with four degassing runners 11, 12, 13, and 14 for one product (cavity 4), and the degassing runner 11 and the degassing runner 12 are joined together. Thus, a degassing runner 15 is formed, and the degassing runner 13 and the degassing runner 14 are joined to form a degassing runner 16. Further, the venting runner 15 and the venting runner 16 are connected to a chill vent 17, respectively.

同様に、他方の製品についても４つのガス抜きランナ２１，２２，２３，２４を設け、ガス抜きランナ２１とガス抜きランナ２２を合流させてガス抜きランナ２５とし、ガス抜きランナ２３とガス抜きランナ２４を合流させてガス抜きランナ２６として構成されている。更に、ガス抜きランナ２５とガス抜きランナ２６は、夫々チルベント２７に接続されている。 Similarly, four degassing runners 21, 22, 23, and 24 are provided for the other product, and the degassing runner 21 and the degassing runner 22 are merged to form a degassing runner 25, and the degassing runner 23 and the degassing runner are combined. 24 is formed as a degassing runner 26. Further, the gas vent runner 25 and the gas vent runner 26 are connected to a chill vent 27, respectively.

ガス抜きランナ１１，１２，１３，１４，１５，１６は、図３及び図４に示すように、断面が幅Ｗと深さＤからなる四角形状に形成されている。例えば、ガス抜きランナ１１，１２，１３，１４の幅Ｗを８ｍｍ、深さＤを７．５ｍｍに設定すると、断面積Ｓは夫々６０ｍｍ^２となる。すると、ガス抜きランナ１１とガス抜きランナ１２、及びランナ１３とランナ１４の合計断面積は、１２０ｍｍ^２となる。また、ガス抜きランナ１１とガス抜きランナ１２を合流させたガス抜きランナ１５の幅Ｗを１２ｍｍ、深さＤを７．５ｍｍに設定すると、断面積Ｓは９０ｍｍ^２となる。 The degassing runners 11, 12, 13, 14, 15, and 16 are formed in a quadrilateral shape having a width W and a depth D as shown in FIGS. 3 and 4. For example, when the width W of the degassing runners 11, 12, 13, and 14 is set to 8 mm and the depth D is set to 7.5 mm, the cross-sectional areas S are 60 mm ² , respectively. Then, the total cross-sectional area of the degassing runner 11 and the degassing runner 12, and the runner 13 and the runner 14 is 120 mm ² . If the width W of the gas vent runner 15 obtained by joining the gas vent runner 11 and the gas vent runner 12 is set to 12 mm and the depth D is set to 7.5 mm, the cross-sectional area S is 90 mm ² .

従って、１つの製品（キャビティ４）からチルベント１７に向かうガス抜きランナの断面積は、ガス抜きランナ１１，１２，１３，１４による２４０ｍｍ^２（６０ｍｍ^２×４）から、ガス抜きランナ１５，１６による１８０ｍｍ^２（９０ｍｍ^２×２）に変化するので、合流後の断面積は２５％減少している。また、チルベント１７のガス抜き断面積は、一箇所当たり幅を５５ｍｍ、深さを０．６９ｍｍとして３８ｍｍ^２に設定している。 Therefore, the cross-sectional area of the venting runner from one product (cavity 4) to the chill vent 17 is from 240 mm ² (60 mm ² × 4) by the venting runners 11, 12, 13, and 14 to by the venting runners 15 and 16. Since it changes to 180 mm ² (90 mm ² × 2), the cross-sectional area after merging is reduced by 25%. The degassing cross-sectional area of the chill vent 17 is set to 38 mm ² with a width of 55 mm and a depth of 0.69 mm per location.

このように、１つの製品についてのガス抜き断面積の変化は、ガス抜きランナが４つの時：２４０ｍｍ^２（６０ｍｍ^２×４）→合流によるガス抜きランナが２つの時：１８０ｍｍ^２（９０ｍｍ^２×２）→チルベント１７が２箇所：７６ｍｍ^２（３８ｍｍ^２×２）となる。他方の製品についてのガス抜きランナ２１，２２，２３，２４，２５，２６やチルベント２７も同様に構成されている。 Thus, the change in the degassing cross-sectional area for one product is as follows: when there are four degassing runners: 240 mm ² (60 mm ² × 4) → when there are two degassing runners by confluence: 180 mm ² (90 mm ² × 2) → Tilvent 17 has two locations: 76 mm ² (38 mm ² × 2). The degassing runners 21, 22, 23, 24, 25, 26 and the chill vent 27 for the other product are configured in the same manner.

合流後のガス抜きランナ１５，１６の断面積を合流前のガス抜きランナ１１，１２，１３，１４の断面積と同一に設定すると、合流後の溶湯の通過速度が合流前の溶湯の通過速度の２倍に急上昇してバリ発生の虞がある。また、チルベント１７で断面積が急激に小さくなると溶湯速度の急上昇によりサージ圧が発生しバリ張りの虞がある。そこで、チルベント１７に流入させる前に、段階的にガス抜きランナの断面積を減少させている。 If the cross-sectional area of the degassing runners 15 and 16 after merging is set to be the same as the cross-sectional area of the degassing runners 11, 12, 13 and 14 before merging, the passing speed of the molten metal after merging is the passing speed of the molten metal before merging. There is a risk of burrs. In addition, when the cross-sectional area is rapidly reduced by the chill vent 17, surge pressure is generated due to a rapid increase in the melt speed, and there is a risk of burr tension. Therefore, before flowing into the chill vent 17, the cross-sectional area of the degassing runner is gradually reduced.

また、合流後のガス抜きランナ１５，１６の断面積の設定は、図４に示すように、深さＤを一定（例えば、７．５ｍｍ）に保ったまま幅Ｗのみ広げる（例えば、１２ｍｍ）ことにより行う。ガス抜きランナ１５，１６の表面積を増やすことによってガス抜きランナ１５，１６の抜熱量を増やし、ガス抜きランナ１５，１６を通過中の溶湯の凝固を促進させてバリの発生を防ぐことになる。 In addition, as shown in FIG. 4, the cross-sectional areas of the gas vent runners 15 and 16 after joining are expanded only by the width W (for example, 12 mm) while keeping the depth D constant (for example, 7.5 mm). By doing. By increasing the surface area of the venting runners 15 and 16, the amount of heat removed from the venting runners 15 and 16 is increased, and solidification of the molten metal passing through the venting runners 15 and 16 is promoted to prevent generation of burrs.

また、キャビティ４からチルベント１７に至るガス抜きランナの流動長を同じにすれば、各ガス抜きランナ１１，１２，１３，１４，１５，１６の断面積が統一されているため、溶湯のランナ通過速度が夫々等しくなり、溶湯の充填タイミングを同時にすることが容易にできる。 Further, if the flow length of the degassing runner from the cavity 4 to the chill vent 17 is made the same, the cross sections of the degassing runners 11, 12, 13, 14, 15, 16 are unified, so that the molten metal passes through the runner. The speeds are equal to each other, and the filling timing of the molten metal can be easily performed at the same time.

チルベント１７には、ガス抜きランナ１５，１６が夫々接続されているが、チルベント１７内に仕切りを配設してガス抜きランナ１５とガス抜きランナ１６を独立させることにより、ガス抜きランナ１５とガス抜きランナ１６が互いに干渉しないようにしている。 Gas vent runners 15 and 16 are connected to the chill vent 17, respectively. However, the gas vent runner 15 and the gas vent runner 16 are separated from each other by disposing a partition in the chill vent 17. The runners 16 are prevented from interfering with each other.

ガス抜きランナ１５とガス抜きランナ１６を干渉させなければ、背圧が立たず、ガス抜きランナの充填完了のタイミングも同時になり、製品の品質にばらつきが生じない。また、ガス抜きランナ１１，１２，１３，１４，１５，１６を通過する溶湯に背圧が掛かると背圧により出口が塞がれバリが発生するが、ガス抜きランナ１５とガス抜きランナ１６を干渉させなければ、バリ発生の虞もない。 If the venting runner 15 and the venting runner 16 do not interfere with each other, no back pressure will be generated, the timing for completing the filling of the venting runner will be the same, and the product quality will not vary. Further, when back pressure is applied to the molten metal passing through the gas vent runners 11, 12, 13, 14, 15, 16, the outlet is blocked by the back pressure and burrs are generated, but the gas vent runner 15 and the gas vent runner 16 are If there is no interference, there is no risk of burrs.

また、オーバフロー５を出たガス抜きランナ１１，１２，１３，１４，１５，１６は、図２に示すように、シール幅Ｅが５０ｍｍ以上を確保できるようレイアウトされている。ここで、シール幅Ｅとは、ガス抜きランナ１１，１２，１３，１４，１５，１６からキャビティ４の端面までの幅をいう。例えば、ガス抜きランナの周囲に幅５ｍｍ程でバリが発生した場合に、次のショットでは幅５ｍｍよりも広い範囲でバリが進展しようとする。この時、金型のシール幅Ｅが５０ｍｍ未満であるとバリが進展し易く、シール幅Ｅが５０ｍｍ以上であるとバリが進展し難い。 Further, the degassing runners 11, 12, 13, 14, 15, and 16 that have exited the overflow 5 are laid out so that a seal width E of 50 mm or more can be secured as shown in FIG. 2. Here, the seal width E refers to the width from the degassing runners 11, 12, 13, 14, 15, 16 to the end face of the cavity 4. For example, when a burr occurs around the degassing runner with a width of about 5 mm, the next shot tries to develop a burr in a range wider than the width of 5 mm. At this time, if the mold seal width E is less than 50 mm, burrs are likely to advance, and if the seal width E is 50 mm or more, burrs are less likely to advance.

本発明によれば、バリの発生が抑制されるので製品の品質が向上すると共に、バリ張りが抑制されるので連続鋳造が可能になるため稼働率が向上する鋳造用金型を提供することができる。 According to the present invention, since the generation of burrs is suppressed, the quality of the product is improved, and since the burr tension is suppressed, continuous casting is possible, so that a casting mold with improved operating rate can be provided. it can.

１…鋳造用金型、２…固定型、３…可動型、４…キャビティ、５…オーバフロー、６…ガス抜き手段、７…ゲート、１１，１２，１３，１４，１５，１６，２１，２２，２３，２４，２５，２６…ガス抜きランナ、１７，２７…チルベント、Ｅ…シール幅、Ｄ…深さ、Ｗ…幅。 DESCRIPTION OF SYMBOLS 1 ... Mold for casting, 2 ... Fixed type, 3 ... Movable type, 4 ... Cavity, 5 ... Overflow, 6 ... Gas venting means, 7 ... Gate, 11, 12, 13, 14, 15, 16, 21, 22 , 23, 24, 25, 26 ... degassing runner, 17, 27 ... chill vent, E ... seal width, D ... depth, W ... width.

Claims

In a casting mold equipped with a venting runner, when a plurality of venting runners are merged, the sectional area of the venting runner after joining is made smaller than the sum of the sectional areas of the venting runners before joining. A casting mold characterized by that.

2. The casting mold according to claim 1, wherein a cross-sectional area of the degassing runner after the merging determined by the depth and the width is set by adjusting the width while keeping the depth constant. Mold for casting.

3. The casting mold according to claim 1, wherein a cross-sectional area of the degassing runner after merging is 0.6 to 0.9 times a total cross-sectional area of each degassing runner before merging. A casting mold characterized by that.