JP5120295B2 - Low pressure casting mold - Google Patents

Low pressure casting mold Download PDF

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JP5120295B2
JP5120295B2 JP2009042936A JP2009042936A JP5120295B2 JP 5120295 B2 JP5120295 B2 JP 5120295B2 JP 2009042936 A JP2009042936 A JP 2009042936A JP 2009042936 A JP2009042936 A JP 2009042936A JP 5120295 B2 JP5120295 B2 JP 5120295B2
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gate
mold
temperature
product
solidification
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JP2010194585A (en
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直人 上坂
仁 大澤
智之 波多野
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Denso Corp
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Denso Corp
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Description

本発明は、鋳造用金型に関するものである。 The present invention relates to a casting mold .

図1は、低圧鋳造方法を示す概略図である。一般的な低圧鋳造方法は、密閉容器11内において、るつぼ14内の溶湯13を加圧空気により、溶湯中に浸漬してある給湯管(ストーク)を介して溶湯13を下から上昇させ、密閉容器11の上方にある金型10に注湯する。その後、湯口部分の凝固完了時点で加圧をやめると、凝固していない液体の状態の溶湯は重力で落ち、給湯管内の溶湯は、るつぼ14内に戻される。その後、金型10内の鋳物を取出す。   FIG. 1 is a schematic view showing a low-pressure casting method. In a general low-pressure casting method, in the sealed container 11, the molten metal 13 in the crucible 14 is raised by pressurized air from below through a hot water pipe (Stoke) immersed in the molten metal, and sealed. Hot water is poured into the mold 10 above the container 11. Thereafter, when the pressurization is stopped at the time of completion of solidification of the pouring gate portion, the melt in a liquid state that has not solidified falls by gravity, and the molten metal in the hot water supply pipe is returned to the crucible 14. Thereafter, the casting in the mold 10 is taken out.

このような低圧鋳造方法において発生する欠陥について説明する。図2は、低圧鋳造方法において発生する欠陥の説明図である。
図2のように溶湯(アルミ)は、加圧空気により下のほうから充填される。充填過程で金型に熱を奪われるため、充填完了時は上の方が、温度が低い状態になる。当然、基本的には凝固は上の方から進行することになる。通常、凝固後金型を、上型20と下型30を上下に開くと、製品は上型20に付着していく。しかしながら、その時に凝固が予定より進行しており、湯口下部まで凝固していると、形状的に抜けず、湯口部が千切れるか、又は、製品が下型30に残ることになることがある。このように金型を上下に開いたときに、製品を取り出せない形状のことを、「アンダーカット」と呼んでいる。
The defect which generate | occur | produces in such a low pressure casting method is demonstrated. FIG. 2 is an explanatory diagram of defects occurring in the low pressure casting method.
As shown in FIG. 2, the molten metal (aluminum) is filled from the lower side with pressurized air. Since the mold is deprived of heat during the filling process, the temperature is lower at the top when filling is completed. Naturally, the solidification basically proceeds from the top. Normally, when the upper mold 20 and the lower mold 30 are opened up and down in the mold after solidification, the product adheres to the upper mold 20. However, solidification has progressed from the schedule at that time, and if it has solidified to the lower part of the gate, the shape may not come off and the gate part may be broken or the product may remain in the lower mold 30. . The shape in which the product cannot be taken out when the mold is opened up and down is called “undercut”.

また、アルミは液体から固体になる過程で体積収縮するので、凝固収縮した分のアルミ溶湯を供給する必要があるが、狙いどおりに上から順序よく凝固すれば、未凝固の部位を通じて下のほうから(湯口から)供給することができる。(なお、このことを「押し湯効果」と呼んでいる。)しかしながら、湯口部または湯口からのアルミ溶湯の通り道の途中(図2のB部)が、先に凝固するとその先にアルミ溶湯を供給できなくなる。そのような状態で凝固収縮すると、図2のA部などにおいて中身がスポンジのようにスカスカになってしまうことがある。これを「ヒケ巣」と呼んでいる。
製品部の凝固収縮分のアルミを供給し続けるために、少なくとも製品部が凝固するまでは加圧し続ける必要があるものの、あまり長く加圧し続けると、湯口下部まで凝固し、アンダーカットになってしまう。
Also, since aluminum shrinks in the process of becoming liquid to solid, it is necessary to supply molten aluminum that has solidified and shrunk, but if it solidifies in order from the top as intended, it will flow from the bottom through the unsolidified part. Can be supplied (from the gate). (This is called the “push-up hot water effect”.) However, when the middle of the aluminum melt path from the gate or from the gate (part B in FIG. 2) solidifies first, the molten aluminum is added to the tip. It becomes impossible to supply. When solidified and contracted in such a state, the contents in the portion A in FIG. This is called the “shink nest”.
In order to continue supplying aluminum for the solidification shrinkage of the product part, it is necessary to continue pressurization at least until the product part solidifies, but if it is pressurized for too long, it solidifies to the lower part of the gate and undercuts. .

これらの欠陥に対して、従来の低圧鋳造においては、製品内のヒケ巣抑制には、湯口の位置・形状・サイズと、加圧パターン(充填パターン)の設定で対処し、アンダーカット防止には加圧パターンの設定で対処していた。この場合に最適な加圧パターンの設定は、外気温やサイクルタイムの変動による金型温度変化があった場合に、変更する必要がある。そこで、例えば特許文献1、特許文献2、特許文献3などに開示されているように、充填開始時の溶湯温度や金型温度を元に、最適な加圧パターンを設定する方法が行われていた。   To prevent these defects, conventional low pressure casting deals with the suppression of sink marks in the product by setting the position, shape and size of the gate and the pressurization pattern (filling pattern). It was dealt with by setting the pressure pattern. In this case, the optimum pressure pattern setting needs to be changed when there is a change in mold temperature due to fluctuations in the outside air temperature or cycle time. Therefore, for example, as disclosed in Patent Document 1, Patent Document 2, Patent Document 3, and the like, a method of setting an optimal pressurization pattern based on the molten metal temperature and the mold temperature at the start of filling is performed. It was.

しかしながら、上記の方法では金型温度が大きく下がった場合などには、湯口の凝固が早いため、アンダーカット防止のために加圧時間を短くせざるを得なくなり、所定の最適な加圧パターンを設定が困難となっていた。そして、加圧時間を短くすると、湯口の押し湯効果が薄れるため、製品内のヒケ巣発生の抑制が難しくなるといった問題が生じていた。   However, in the above method, when the mold temperature is greatly lowered, the gate is rapidly solidified, so the pressurization time has to be shortened to prevent undercut, and a predetermined optimum pressurization pattern is formed. Setting was difficult. When the pressurization time is shortened, the hot water pouring effect of the pouring gate is diminished, which causes a problem that it is difficult to suppress the occurrence of the sink nest in the product.

特開2002−254154号公報JP 2002-254154 A 特開平7−60429号公報Japanese Patent Laid-Open No. 7-60429 特開平11−47908号公報JP-A-11-47908

本発明は、上記問題に鑑み、アンダーカットが容易に防止され、製品内のヒケ巣発生が抑制された低圧鋳造方法及び鋳造用金型を提供するものである。   In view of the above problems, the present invention provides a low-pressure casting method and a casting mold in which undercutting is easily prevented and generation of a sink nest in a product is suppressed.

上記課題を解決するために、請求項1の発明は、加圧気体で溶湯を供給して製品部を低圧鋳造する低圧鋳造用の金型であって、該金型は、上型(20)と下型(30)を具備し、前記下型(30)は、少なくとも湯口上部(2)における湯口上部金型(31)と湯口下部(3)における湯口下部金型(32)とに分割されており、前記湯口上部(2)と前記湯口下部(3)の境目にはくびれ形状部(9)が形成され、さらに、前記湯口上部金型(31)、前記湯口下部金型(32)は、それぞれ、ヒータ(4、6)及び温度センサ(5、7)を具備し、前記上型(20)と前記湯口上部金型(31)の間、前記湯口上部金型(31)と前記湯口下部金型(32)との間には、それぞれ、断熱材(8)が設置されており、前記湯口上部金型(31)の温度と前記湯口下部金型(32)の温度を、別々の設定温度に設定し、前記湯口上部(2)における前記溶湯の凝固時間が、前記製品部の凝固時間より若干長くなるように、前記湯口上部(2)における前記湯口上部金型(31)の温度を設定したことを特徴とする。 In order to solve the above-mentioned problems, the invention of claim 1 is a low-pressure casting mold for supplying a molten metal with a pressurized gas to perform low-pressure casting of a product part, and the mold is an upper mold (20). And the lower mold (30), and the lower mold (30) is divided into at least a gate upper mold (31) in the upper gate (2) and a lower gate mold (32) in the lower gate (3). A constricted shape portion (9) is formed at the boundary between the upper gate (2) and the lower gate (3). Further, the upper gate mold (31) and the lower gate mold (32) Each having a heater (4, 6) and a temperature sensor (5, 7), between the upper mold (20) and the upper gate mold (31), and between the upper gate mold (31) and the gate. A heat insulating material (8) is installed between the lower mold (32) and the upper mold (3 ) And the temperature of the lower mold (32) are set to different set temperatures so that the solidification time of the molten metal at the upper part (2) is slightly longer than the solidification time of the product part. The temperature of the upper gate mold (31) in the upper gate (2) is set .

これにより、ヒータにより、湯口上下部の金型温度を狙いの設定値に制御できるため、外気温やサイクルタイムの変動による金型温度変化がある中でも、十分な押し湯効果を得ることができ、アンダーカット防止も容易となる。また、湯口上部の金型温度を高めに設定することで、湯口の凝固を遅らせることができるので、湯口を小さくすることが可能となり、従来の低圧鋳造技術では湯口設置の制限上、成形が難しかった形状の製品でも、容易に成形が可能となる。
また、湯口の温度制御を行うことにより、品質の安定化と湯口の位置・形状・サイズの自由度が得られる。
断熱材(8)が設置されていることにより、ヒータにより、湯口上下部の金型温度を独立して制御でき、狙いの設定値に制御できる。
そして、ヒータにより、湯口部上下部の金型温度を狙いの設定値に制御できるため、外気温やサイクルタイムの変動による金型温度変化がある中でも、十分な押し湯効果を得ることができ、アンダーカット防止も容易となる。また、湯口部の金型温度を高めに設定することで、湯口の凝固を遅らせることができるので、湯口を小さくすることが可能となり、従来の低圧鋳造技術では湯口設置の制限上、成形が難しかった形状の製品でも、容易に成形が可能となる。
Thereby, since the mold temperature at the upper and lower portions of the gate can be controlled to a target set value by the heater, even if there is a mold temperature change due to fluctuations in the outside air temperature or cycle time, a sufficient hot water effect can be obtained. Undercut prevention is also easy. In addition, by setting the mold temperature at the top of the sprue high, it is possible to delay the solidification of the sprue, making it possible to reduce the sprue. Even products with different shapes can be molded easily.
Moreover, by controlling the temperature of the gate, the quality can be stabilized and the position, shape and size of the gate can be freely controlled.
By installing the heat insulating material (8), the mold temperature at the top and bottom of the gate can be controlled independently by the heater, and the target set value can be controlled.
And because the heater can control the mold temperature at the upper and lower parts of the gate part to a target set value, even if there is a mold temperature change due to fluctuations in the outside air temperature and cycle time, a sufficient hot water effect can be obtained, Undercut prevention is also easy. In addition, by setting the mold temperature at the gate low, it is possible to delay the solidification of the gate, so it is possible to reduce the size of the gate. Even products with different shapes can be molded easily.

なお、上記に付した符号は、後述する実施形態に記載の具体的実施態様との対応関係を示す一例である。   In addition, the code | symbol attached | subjected above is an example which shows a corresponding relationship with the specific embodiment as described in embodiment mentioned later.

低圧鋳造方法を示す概略図である。It is the schematic which shows a low pressure casting method. 低圧鋳造方法において発生する欠陥の説明図である。It is explanatory drawing of the defect which generate | occur | produces in a low pressure casting method. 湯口部を2分割した金型を概略的に示す図である。It is a figure which shows roughly the metal mold | die which divided the gate part into two. 単気筒エンジンのシリンダの湯口を説明する図であり、(a)は、製品形状を示す正面図(上)と平面図(下)、(b)は、湯口の一例を示す正面図(上)と平面図(下)、(c)は、湯口の他の一例を示す正面図(上)と平面図(下)である。It is a figure explaining the gate of the cylinder of a single cylinder engine, (a) is a front view (upper) which shows a product shape, a top view (lower), (b) is a front view (upper) which shows an example of a gate. And (c) are a front view (top) and a plan view (bottom) showing another example of the gate.

以下、図面を参照して、本発明の一実施形態を説明する。各実施態様について、同一構成の部分には、同一の符号を付してその説明を省略する。従来技術に対しても同様に同一構成の部分には、同一の符号を付してその説明を省略する。   Hereinafter, an embodiment of the present invention will be described with reference to the drawings. About each embodiment, the same code | symbol is attached | subjected to the part of the same structure, and the description is abbreviate | omitted. Similarly, with respect to the prior art, parts having the same configuration are denoted by the same reference numerals and description thereof is omitted.

本発明を低圧鋳造金型で製品部1を鋳造する場合の一実施形態について説明する。
図3は、湯口部を2分割した金型を概略的に示す図である。上型20もいくつかに分割しているがここでは省略する。製品部1にヒケ巣を発生させないことが重要である。下型30は、図3の場合は3分割され、さらに、下型30の湯口部は、湯口上部2と湯口下部3に2分割されている。下型30は、必要に応じて分割数を適宜設定する。下型30の湯口下部金型32及び湯口上部金型31には、それぞれ、ヒータとヒータ制御用の温度センサを設置している。湯口下部3を未凝固で保持するために、第2ヒータ6とそれを制御する第2温度センサ7によって湯口下部金型32の温度を制御し、また湯口上部2を狙いの時間に凝固させるために、第1ヒータ4と第1温度センサ5によって湯口上部金型31の温度を制御する。また、湯口上部金型31と湯口下部金型32間の熱移動を妨げる断熱板8を当該金型間に設置しており、これによりそれぞれの金型で独立した温度制御が可能となるようにしている。
An embodiment of the present invention when casting the product part 1 with a low pressure casting mold will be described.
FIG. 3 is a diagram schematically showing a mold obtained by dividing the gate portion into two parts. The upper mold 20 is also divided into several parts, but is omitted here. It is important not to cause a sink in the product part 1. In the case of FIG. 3, the lower mold 30 is divided into three parts, and the gate part of the lower mold 30 is further divided into two parts, an upper part 2 and a lower part 3. The lower mold 30 appropriately sets the number of divisions as necessary. A heater and a temperature sensor for controlling the heater are installed in the lower mold 32 and the upper mold 31 of the lower mold 30, respectively. In order to hold the pouring gate lower part 3 in an unsolidified state, the temperature of the pouring gate lower mold 32 is controlled by the second heater 6 and the second temperature sensor 7 for controlling it, and the pouring gate upper part 2 is solidified at a target time. In addition, the temperature of the gate top mold 31 is controlled by the first heater 4 and the first temperature sensor 5. In addition, a heat insulating plate 8 that prevents heat transfer between the gate upper mold 31 and the gate lower mold 32 is installed between the molds, so that independent temperature control is possible for each mold. ing.

ここで、湯口上部金型31及び湯口下部金型32は2分割しているが、製品を取出すときの型開きに問題が生じないような湯口形状とすれば、必ずしも2分割する必要はない。この場合には、湯口上部2を狙いの時間に凝固させるために、第1ヒータ4と第1温度センサ5を設け、湯口下部3を未凝固で保持するために、第2ヒータ6とそれを制御する第2温度センサ7を設けて温度を制御する。湯口形状は周知のように様々な変形が考えられる。また、湯口形状に応じて、温度制御を2段階以上にすることも可能である。湯口上部金型31及び湯口下部金型32は2分割しているが、2分割以上であっても良い。   Here, the gate upper mold 31 and the gate lower mold 32 are divided into two, but it is not always necessary to divide into two if the gate shape is such that there is no problem in mold opening when taking out the product. In this case, the first heater 4 and the first temperature sensor 5 are provided in order to solidify the upper gate 2 at a target time, and the second heater 6 and the second heater 6 are coupled to hold the lower gate 3 unsolidified. A second temperature sensor 7 to be controlled is provided to control the temperature. The gate shape can be variously modified as is well known. Further, the temperature control can be performed in two or more stages according to the gate shape. The gate upper mold 31 and the gate lower mold 32 are divided into two parts, but may be divided into two or more parts.

従来、製品部が、湯口に対し大きい場合(または湯口が製品部に対し小さい場合)、充填完了時の温度は製品部のほうが低くても、持っている熱量が大きいため凝固までに時間がかかり、湯口のほうが先に凝固することが生じる。そうなると、製品部の凝固収縮に対する溶湯供給ができなくなり、製品部にヒケ巣が発生することが生じる。このためには、製品に合わせた湯口サイズの設定が重要になる。湯口は平面部にしか付けることができないため、製品の形状に合わせた形状・サイズ設定しかできず、製品の形状によっては、小さい湯口しか設けられず、製品形状を変えざるを得ないケースが生じていた。   Conventionally, if the product part is larger than the spout (or if the spout is smaller than the product part), it takes time to solidify due to the large amount of heat even if the temperature at the completion of filling is lower in the product part. The spout will solidify first. If it becomes so, it will become impossible to supply the molten metal with respect to the solidification shrinkage | contraction of a product part, and it will arise that a sink nest generate | occur | produces in a product part. For this purpose, it is important to set the gate size according to the product. Since the gate can only be attached to the flat part, only the shape and size can be set according to the shape of the product. Depending on the shape of the product, only a small gate may be provided and the product shape must be changed. It was.

本実施形態によれば、このような問題を解決し、湯口部の金型を2つ以上に分割し、それぞれ別系統の温度設定を行うことで、湯口の凝固を制御することを特徴とするものである。ヒータにより、湯口部の金型温度を狙いの設定値に制御できるため、外気温やサイクルタイムの変動による金型温度変化がある中でも、十分な押し湯効果を得ることができ、アンダーカット防止も容易となる。また、湯口部の金型温度を高めに設定することで、湯口の凝固を遅らせることができるので、湯口を小さくすることが可能となり、従来の低圧鋳造技術では湯口設置の制限上、成形が難しかった形状の製品でも、容易に成形が可能となるものである。   According to this embodiment, such problems are solved, and the mold of the gate is divided into two or more, and the temperature setting of different systems is performed to control the solidification of the gate. Is. The heater can control the mold temperature at the gate to the target set value, so that even if there is a mold temperature change due to fluctuations in the outside air temperature or cycle time, a sufficient hot-water injection effect can be obtained and undercut prevention is also possible. It becomes easy. In addition, by setting the mold temperature at the gate low, it is possible to delay the solidification of the gate, so it is possible to reduce the size of the gate. Even products with different shapes can be molded easily.

次に、湯口部の金型温度の制御について述べる。
湯口部の金型温度の制御にあたっては、次の視点が重要である。すなわち、低圧鋳造において、湯口の温度を制御し、図3のゲート9を最終凝固部とすることで製品内部へのヒケ巣発生を抑制すること、湯口のくびれ形状部下方(ゲート9の下方の湯口下部)まで凝固が進むことによるアンダーカットを防止することの2点を両立させる必要がある。そのためには、狙いの時間に凝固させる部分(湯口上部)と未凝固で保持する部分(湯口下部)で別々に温度を設定するとともに、湯口上部に関しては、製品と湯口それぞれの形状・サイズから最適な凝固タイミングを設定し、その凝固タイミングを達成するための金型温度を設定する。
Next, control of the mold temperature at the gate will be described.
The following viewpoints are important in controlling the mold temperature of the gate. That is, in low-pressure casting, the temperature of the gate is controlled, and the gate 9 in FIG. 3 is used as the final solidified portion to suppress the formation of sink nests inside the product, and below the constricted shape of the gate (below the gate 9). It is necessary to satisfy both of the points of preventing undercut due to progress of solidification to the lower part of the gate. For this purpose, the temperature is set separately for the part that solidifies at the target time (upper gate) and the part that remains unsolidified (lower gate), and the upper part of the gate is optimal from the shape and size of the product and the gate. The solidification timing is set, and the mold temperature for achieving the solidification timing is set.

一例として、湯口下部に関しては、金型表面温度が、アルミが凝固しない温度(600℃)で固定する。湯口上部の温度設定に関しては、製品と湯口の形状・大きさにより変化するが、湯口上部の凝固時間が、製品部の凝固時間よりも少し長め(僅かな所定時間だけ長い)になるように、湯口上部の金型温度を少し高め(僅かな所定温度だけ高い)に設定する。
湯口上部の金型温度Tの設定に関して、アルミ溶湯から金型への熱伝達を以下の式で考える。
As an example, for the lower part of the gate, the mold surface temperature is fixed at a temperature at which aluminum does not solidify (600 ° C.). Regarding the temperature setting at the top of the gate, it varies depending on the shape and size of the product and the gate, but the solidification time at the top of the gate is slightly longer than the solidification time of the product (longer by a predetermined time). Set the mold temperature at the top of the gate slightly higher (higher by a small predetermined temperature).
Regarding the setting of the mold temperature T at the top of the gate, heat transfer from the molten aluminum to the mold is considered by the following formula.

ΔQ=k(Ta−Td)
ただし、ΔQ:単位時間、単位面積あたりのアルミ溶湯から金型への熱伝達量
k:熱伝達係数、
Ta:アルミ溶湯温度、
Td:金型温度
ΔQ = k (Ta−Td)
Where ΔQ is the amount of heat transfer from the molten aluminum to the mold per unit time and unit area
k: heat transfer coefficient,
Ta: molten aluminum temperature,
Td: mold temperature

充填完了時の溶湯温度、金型温度を、湯流れ解析(CAE、Computor Aided Engineering)で計算する。それら温度を基に上式でΔQの合計が、凝固に要する脱熱量に至るまでの時間tを、まず製品部について計算する。湯口上部での凝固が、その時間tと同じになるような湯口上部の金型温度T0を計算し、その時間tよりも少し長くなるように、T0より少し高めに湯口上部の金型温度Tを設定する。
加圧パターン制御については、湯口上部の温度を計測して、湯口が凝固したと考えられる時間で加圧を終了するなどの方法が考えられる。
The molten metal temperature and mold temperature at the completion of filling are calculated by molten metal flow analysis (CAE, Computor Aided Engineering). Based on these temperatures, the time t until the total ΔQ in the above equation reaches the amount of heat removal required for solidification is first calculated for the product part. The mold temperature T 0 at the top of the gate is calculated so that the solidification at the top of the gate is the same as the time t, and the mold at the top of the gate is slightly higher than T 0 so that it is slightly longer than the time t. Set the temperature T.
Regarding the pressurization pattern control, a method of measuring the temperature at the top of the gate and ending the pressurization at a time when the gate is considered to have solidified can be considered.

次に、別の実施形態として、湯口の一例として、単気筒エンジンのシリンダについて考える。図4は、単気筒エンジンのシリンダの湯口を説明する図であり、(a)は、製品形状を示す正面図(上)と平面図(下)、(b)は、湯口の一例を示す正面図(上)と平面図(下)、(c)は、湯口の他の一例を示す正面図(上)と平面図(下)である。
図4(a)の製品形状から、設置する湯口箇所は図4(b)と(c)の2つが考えられるが、図4(b)は、製品に対し、湯口が小さすぎて十分な押し湯効果が期待できないため、従来は、図4(c)を採用せざるを得なかった。この場合、湯口が大きくなるため、サイクルタイムが長くなり(生産性が悪くなり)、また製品重量に対する湯口重量が大きく、無駄(捨てる部分)が大きくなり、材料歩留まりが悪くなる。本発明の各実施形態により、湯口部の金型温度を最適設定することで、図4(b)の湯口でも十分な押し湯効果が期待でき、図4(b)を採用することが可能となった。これにより、生産性アップと材料歩留まりが改善することができる。
Next, as another embodiment, a cylinder of a single cylinder engine is considered as an example of the gate. 4A and 4B are diagrams illustrating a gate of a cylinder of a single cylinder engine. FIG. 4A is a front view showing the product shape (upper), a plan view (lower), and FIG. 4B is a front view showing an example of the gate. A figure (top), a top view (bottom), and (c) are a front view (top) and a plan view (bottom) showing another example of the gate.
From the product shape in Fig. 4 (a), there are two possible locations for the sprue to be installed, Fig. 4 (b) and (c), but Fig. 4 (b) shows that the sprue is too small for the product. Since the hot water effect cannot be expected, conventionally, FIG. 4 (c) has been employed. In this case, since the gate becomes larger, the cycle time becomes longer (productivity becomes worse), the weight of the gate relative to the product weight becomes larger, the waste (the portion to be discarded) becomes larger, and the material yield becomes worse. According to each embodiment of the present invention, by optimally setting the mold temperature of the gate, a sufficient hot-water effect can be expected even at the gate of FIG. 4B, and FIG. 4B can be adopted. became. Thereby, productivity improvement and material yield can be improved.

1 製品部
2 湯口上部
3 湯口下部
4 第1ヒータ
5 第1温度センサ
6 第2ヒータ
7 第2温度センサ
9 ゲート
20 上型
30 下型
31 湯口上部金型
32 湯口下部金型
DESCRIPTION OF SYMBOLS 1 Product part 2 Upper gate 3 Lower gate 4 First heater 5 First temperature sensor 6 Second heater 7 Second temperature sensor 9 Gate 20 Upper mold 30 Lower mold 31 Upper gate mold 32 Lower gate mold

Claims (1)

加圧気体で溶湯を供給して製品部を低圧鋳造する低圧鋳造用の金型であって、
該金型は、上型(20)と下型(30)を具備し、
前記下型(30)は、少なくとも湯口上部(2)における湯口上部金型(31)と湯口下部(3)における湯口下部金型(32)とに分割されており、
前記湯口上部(2)と前記湯口下部(3)の境目にはくびれ形状部(9)が形成され、
さらに、前記湯口上部金型(31)、前記湯口下部金型(32)は、それぞれ、ヒータ(4、6)及び温度センサ(5、7)を具備し、
前記上型(20)と前記湯口上部金型(31)の間、前記湯口上部金型(31)と前記湯口下部金型(32)との間には、それぞれ、断熱材(8)が設置されており、
前記湯口上部金型(31)の温度と前記湯口下部金型(32)の温度を、別々の設定温度に設定し、前記湯口上部(2)における前記溶湯の凝固時間が、前記製品部の凝固時間より若干長くなるように、前記湯口上部(2)における前記湯口上部金型(31)の温度を設定したことを特徴とする低圧鋳造用金型。
A mold for low-pressure casting in which molten metal is supplied with pressurized gas to low-pressure cast the product part,
The mold comprises an upper mold (20) and a lower mold (30),
The lower mold (30) is divided into at least a gate upper mold (31) in the upper gate (2) and a lower gate mold (32) in the lower gate (3),
A constricted portion (9) is formed at the boundary between the upper gate (2) and the lower gate (3),
Further, the gate upper mold (31) and the gate lower mold (32) each include a heater (4, 6) and a temperature sensor (5, 7) ,
A heat insulating material (8) is installed between the upper mold (20) and the gate upper mold (31) and between the gate upper mold (31) and the gate lower mold (32), respectively. Has been
The temperature of the gate upper mold (31) and the temperature of the lower gate mold (32) are set to different set temperatures, and the solidification time of the melt in the upper gate (2) is determined by the solidification of the product part. The mold for low-pressure casting , wherein the temperature of the upper gate mold (31) in the upper gate (2) is set to be slightly longer than the time .
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