JP2017115195A - Cooling device of metal mold, and its method - Google Patents
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- 238000001816 cooling Methods 0.000 title claims abstract description 165
- 238000000034 method Methods 0.000 title abstract description 18
- 239000002184 metal Substances 0.000 title abstract description 5
- 239000000112 cooling gas Substances 0.000 claims abstract description 17
- 238000004512 die casting Methods 0.000 abstract description 51
- 230000006872 improvement Effects 0.000 abstract description 3
- 230000002265 prevention Effects 0.000 abstract 2
- 238000010791 quenching Methods 0.000 description 19
- 230000000171 quenching effect Effects 0.000 description 19
- 239000007789 gas Substances 0.000 description 13
- 238000010438 heat treatment Methods 0.000 description 11
- 230000008859 change Effects 0.000 description 10
- 230000009466 transformation Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000005336 cracking Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 230000002123 temporal effect Effects 0.000 description 2
- 238000000137 annealing Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Heat Treatments In General, Especially Conveying And Cooling (AREA)
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- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
Description
本発明は、ダイカスト金型の冷却装置およびその方法に関するものである。 The present invention relates to a cooling device for a die casting mold and a method therefor.
大型ダイカスト金型の高硬度化や、ハイサイクル化に伴う内冷強化が進んでいる。それに伴い、ダイカスト金型裏面の割れが生じやすくなり、裏面冷却水穴や鋳抜きピン穴からの割れによる水漏れや、焼き鈍し後の変形などが起きる。そのため、一般的なダイカスト金型裏面の割れを防止するための技術が幾つか提案されている。 Hardening of large die-casting dies and internal cooling strengthening due to high cycle are progressing. Along with this, cracks on the back side of the die casting mold are likely to occur, and water leakage due to cracks from the back surface cooling water holes and the core pin holes, deformation after annealing, and the like occur. For this reason, several techniques for preventing cracking of the back surface of a general die casting mold have been proposed.
例えば、特許文献1に示された従来の金型の焼入れ方法においては、A1変態点からA3変態点の温度域を100℃/H以上の加熱焼入れ昇温工程の後、A3変態点以上で1150℃を超えない温度域で保持をする保持工程を行い、次いでA3変態点から600℃までの温度域を5〜20℃/minの冷却速度で焼入れ冷却工程を行い、500〜400℃までの温度域にて0.5〜5時間の中断保持工程を経た後、400〜200℃の温度域を1〜15℃/minの冷却速度で冷却する低温側焼入れ冷却工程を経る。
本金型の焼入れ方法によれば、結晶粒が焼入温度を高めても微細なまま維持されるため、高靭性が得られ、金型に大きな負荷がかかった時の大割れを防止できる。また、焼入温度も高めることができるので、硬さ、高温硬さも高く、ヒートクラック等の抑制に効果がある。また熱処理歪みの低減により、熱処理後の手直し工数を低減に効果を奏するものである。
For example, in the conventional mold quenching method disclosed in Patent Document 1, the temperature range from the A1 transformation point to the A3 transformation point is set to 1150 at the A3 transformation point or higher after the heating and quenching temperature rising step of 100 ° C./H or higher. A holding step of holding in a temperature range not exceeding ℃ is performed, and then a quenching cooling step is performed at a cooling rate of 5 to 20 ° C./min in a temperature range from the A3 transformation point to 600 ° C., and a temperature from 500 to 400 ° C. After undergoing an interrupting and holding step for 0.5 to 5 hours in the zone, a low-temperature side quenching and cooling step is performed in which the temperature range of 400 to 200 ° C. is cooled at a cooling rate of 1 to 15 ° C./min.
According to the quenching method of the present mold, since the crystal grains remain fine even when the quenching temperature is increased, high toughness can be obtained and large cracks can be prevented when a large load is applied to the mold. Moreover, since a quenching temperature can also be raised, hardness and high temperature hardness are also high and it is effective in suppression of a heat crack etc. In addition, the reduction in heat treatment strain is effective in reducing the number of man-hours for repair after heat treatment.
また、特許文献2に示された従来の金型の焼入れ方法においては、A1変態点からA3変態点の温度域を100℃/H以上の加熱速度で加熱する焼入れ昇温工程の後、A3変態点以上で1150℃を超えない温度域で保持をする保持工程を行い、次いでA3変態点から600℃までの温度域を5〜20℃/minの冷却速度で焼入れ冷却工程を行い、500〜400℃までの温度域にて0.5〜5時間の中断保持工程を経た後、400〜200℃の温度域を1〜15℃/minの冷却速度で冷却する低温側焼入れ冷却工程を経る。
この発明の金型の焼入れ方法によれば、結晶粒が焼入温度を高めても微細なまま維持されるため、高靭性が得られ、金型に大きな負荷がかかった時の大割れを防止できる。また、焼入温度も高めることができるので、硬さ、高温硬さも高く、ヒートクラック等の抑制に効果がある。また熱処理歪みの低減により、熱処理後の手直し工数を低減に効果を奏するものである。 また、特許文献3〜5にも他の金型の焼入れ方法が開示されている。
In the conventional mold quenching method disclosed in Patent Document 2, the A3 transformation is performed after the quenching temperature raising step of heating the temperature range from the A1 transformation point to the A3 transformation point at a heating rate of 100 ° C./H or more. A holding step of holding in a temperature range not lower than 1150 ° C. above the point is performed, and then a quenching cooling step is performed in a temperature range from the A3 transformation point to 600 ° C. at a cooling rate of 5 to 20 ° C./min. After passing through the interrupting and holding step for 0.5 to 5 hours in the temperature range up to 0 ° C., a low-temperature side quenching cooling step for cooling the temperature range of 400 to 200 ° C. at a cooling rate of 1 to 15 ° C./min.
According to the mold quenching method of the present invention, since the crystal grains remain fine even when the quenching temperature is increased, high toughness is obtained and large cracks are prevented when a large load is applied to the mold. it can. Moreover, since a quenching temperature can also be raised, hardness and high temperature hardness are also high and it is effective in suppression of a heat crack etc. In addition, the reduction in heat treatment strain is effective in reducing the number of man-hours for repair after heat treatment. Also, Patent Documents 3 to 5 disclose other mold hardening methods.
しかしながら、上記の先行技術のようなダイカスト金型の冷却装置およびその方法では、多様なダイカスト金型の形状に対して、十分な冷却効果を得られないという問題がある。すなわち、直方体以外の、L型等の様々な形状のダイカスト金型に対して、特に凹部となる箇所は、中心部とほぼ同様に、温度が下がるのが遅い。
そのため、従来のダイカスト金型およびその熱処理方法では、大型ダイカスト金型の高硬度化や、ハイサイクル化に伴う内冷強化に伴うダイカスト金型裏面の割れを十分に防止できないという問題がある。
However, the above-described prior art die casting mold cooling apparatus and method have a problem that a sufficient cooling effect cannot be obtained for various shapes of die casting molds. That is, with respect to die-casting dies of various shapes such as an L shape other than a rectangular parallelepiped, the temperature of a portion that becomes a concave portion is slow to decrease in the same manner as the central portion.
Therefore, the conventional die casting mold and the heat treatment method thereof have a problem that cracking of the back surface of the die casting mold due to the high hardness of the large die casting mold and the internal cooling strengthening accompanying the high cycle cannot be sufficiently prevented.
本発明は、上述した問題点に鑑み、様々な形状のダイカスト金型に対して、特に凹部を有するダイカスト金型の割れ防止、変形防止、内部組織向上の観点から、凹部の冷却速度を平面部の冷却速度に近づけるための冷却装置およびその方法を提供することを目的としている。 In view of the above-mentioned problems, the present invention is designed to reduce the cooling rate of the concave portion of the die casting mold having various shapes, particularly from the viewpoint of preventing cracking, preventing deformation, and improving the internal structure of the die casting die having the concave portion. An object of the present invention is to provide a cooling device and method for approaching the cooling rate of the above.
本発明に係るダイカスト金型の冷却装置は、冷却炉内の冷却ガス吹き出し口に接続されたスポット冷却用ホースを備え、スポット冷却用ホースの先端を、冷却炉内の金型の凹部近傍に設置し、冷却ガスを直接金型の凹部に当てて、金型を冷却することを特徴とする。 The die-casting mold cooling device according to the present invention includes a spot cooling hose connected to a cooling gas outlet in the cooling furnace, and the tip of the spot cooling hose is installed in the vicinity of the recess of the mold in the cooling furnace. The cooling gas is directly applied to the recess of the mold to cool the mold.
また、本発明に係るダイカスト金型冷却方法は、冷却炉内の冷却ガス吹き出し口に接続されたスポット冷却用ホースを備えた冷却炉において、スポット冷却用ホースの先端を、冷却炉内の金型の凹部近傍に設置し、冷却ガスを直接金型の凹部に当てて、金型を冷却する工程を含むことを特徴とする。 The die casting mold cooling method according to the present invention is a cooling furnace having a spot cooling hose connected to a cooling gas outlet in the cooling furnace, wherein the tip of the spot cooling hose is connected to the mold in the cooling furnace. And a step of cooling the mold by directly applying the cooling gas to the recess of the mold.
本発明に係るダイカスト金型の冷却装置およびその方法によれば、スポット冷却用ホースの先端を、冷却炉内の金型の凹部近傍に設置し、冷却ガスを直接金型の凹部に当てるので、凹部の冷却速度を平面部の冷却速度に近づけることができ、凹部を有するダイカスト金型の割れ防止、変形防止、内部組織向上を図ることができる。 According to the die casting die cooling apparatus and method according to the present invention, the tip of the spot cooling hose is installed in the vicinity of the concave portion of the die in the cooling furnace, and the cooling gas is directly applied to the concave portion of the die. The cooling rate of the concave portion can be made close to the cooling rate of the flat portion, and the die casting mold having the concave portion can be prevented from being cracked, deformed, and improved in internal structure.
以下、本発明の実施形態につき、図面を参照しながら説明を行う。
図1及び図2は、本発明に係るダイカスト金型のスポット冷却方法の概念を示す図である。構造の詳細な箇所は省略している。
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 are views showing the concept of a spot cooling method for a die casting mold according to the present invention. Detailed parts of the structure are omitted.
冷却炉1は、略円筒型の形状であって、側壁には複数の冷却ガス吹き出し口2が内側に向けて設置されている。冷却炉内を加圧し、窒素ガスで冷却炉内の製品を冷却する。冷却ガスは、この冷却炉1の上方から冷却ファンにより、各冷却ガス吹き出し口2から吹き出されるようになっている。冷却炉1の底面には、冷却対象であるL型テストピース4が設置されている。ここでは、3個の冷却ガス吹き出し口2に、ステンレス製のスポット冷却用フレキシブルホース3がそれぞれ接続され、3個のスポット冷却用フレキシブルホース3の先端がL型ダイカスト金型テストピース4の凹部付近に固定されている。なお、固定器具は図示を省略している。
L型ダイカスト金型テストピース4には、その凹部付近の内部に凹部温度センサ5Aが、また、中心部には中心部温度センサ5Bが、温度変化の計測のために設置されている。
The cooling furnace 1 has a substantially cylindrical shape, and a plurality of cooling gas outlets 2 are installed on the side wall inward. The inside of the cooling furnace is pressurized, and the product in the cooling furnace is cooled with nitrogen gas. The cooling gas is blown out from each cooling gas outlet 2 from above the cooling furnace 1 by a cooling fan. On the bottom surface of the cooling furnace 1, an L-shaped test piece 4 that is a cooling target is installed. Here, the stainless steel spot cooling flexible hoses 3 are connected to the three cooling gas outlets 2 respectively, and the tips of the three spot cooling flexible hoses 3 are in the vicinity of the recesses of the L-shaped die casting mold test piece 4. It is fixed to. In addition, illustration of the fixing device is omitted.
The L-shaped die casting mold test piece 4 is provided with a recessed portion temperature sensor 5A in the vicinity of the recessed portion, and a central portion temperature sensor 5B is installed in the central portion for measuring temperature changes.
図3は、L型ダイカスト金型テストピース4の構成を示す図である。L型ダイカスト金型テストピース4は、外形300×300×300mm、重量155kgのDAC−Pである。そのうち、 150×150×300mmの部分が切断され、凹部が形成されている。凹部温度センサ5Aを設置するため、凹部の一番奥から5×5mmの位置に、シース線挿入深さ150mmで丸孔が形成されている。また、中心部温度センサ5Bを設置するため、凹部の対角に位置する端部から75×75mmの位置の中心部に、シース線挿入深さ150mmで丸孔が形成されている。各温度センサは、外部の温度計測器に接続され、温度データが保存・処理される。 FIG. 3 is a diagram showing a configuration of the L-shaped die casting mold test piece 4. The L-type die casting mold test piece 4 is a DAC-P having an outer shape of 300 × 300 × 300 mm and a weight of 155 kg. Among them, a 150 × 150 × 300 mm portion is cut to form a recess. In order to install the recessed portion temperature sensor 5A, a round hole is formed at a position 5 × 5 mm from the innermost portion of the recessed portion with a sheath wire insertion depth of 150 mm. Further, in order to install the center temperature sensor 5B, a round hole with a sheath wire insertion depth of 150 mm is formed in the center portion at a position of 75 × 75 mm from the end located diagonally of the recess. Each temperature sensor is connected to an external temperature measuring instrument, and temperature data is stored and processed.
図4に示した通り、L型ダイカスト金型テストピース4の角は2方向または3方向から冷却される為、その角の構成面数により冷却速度は異なる(Corner effect:隅角効果)。平面部の冷却速度をVとすると、2面角は3V、3面角は7Vとなり、面数が多くなればより速く冷える。逆に、凹部は遅くなり、(1/3)Vになる。このように同じ品物でも部位によって冷却速度が不同となる。熱処理過程中の製品は熱と組織変化による膨張収縮にさらされ、その熱応力と変態応力の集中によって材料の持つ強度を上回った時に焼割れが生じ、変形の原因ともなる。その為製品全体を均一に冷却することが重要となる。 As shown in FIG. 4, since the corners of the L-shaped die-casting die test piece 4 are cooled from two or three directions, the cooling rate differs depending on the number of constituent surfaces of the corners (Corner effect). Assuming that the cooling rate of the flat portion is V, the dihedral angle is 3 V, the trihedral angle is 7 V, and the cooling is faster as the number of surfaces increases. On the contrary, the concave portion becomes slow and becomes (1/3) V. In this way, even in the same product, the cooling rate is different depending on the part. Products during the heat treatment process are subject to expansion and contraction due to heat and structural changes. When the strength of the material exceeds the strength of the material due to the concentration of thermal stress and transformation stress, it causes cracking and causes deformation. Therefore, it is important to cool the entire product uniformly.
図5は、本発明に係るダイカスト金型のスポット冷却方法における焼入れサイクルを示す図である。600℃まで加熱し、3時間程度600℃を保持する。次に、800℃まで加熱し、2時間程度800℃を保持する。次に1025℃まで加熱し、3時間程度1025℃を保持する。次に、焼き入れ加熱後、冷却炉内を6barに加圧して窒素ガスで2時間冷却する工程が、本発明に係る工程である。 FIG. 5 is a diagram showing a quenching cycle in the spot cooling method of the die casting mold according to the present invention. Heat to 600 ° C and hold at 600 ° C for about 3 hours. Next, it heats to 800 degreeC and hold | maintains 800 degreeC for about 2 hours. Next, it is heated to 1025 ° C. and maintained at 1025 ° C. for about 3 hours. Next, after quenching and heating, the process of pressurizing the inside of the cooling furnace to 6 bar and cooling with nitrogen gas for 2 hours is the process according to the present invention.
図6は、本発明に係るダイカスト金型のスポット冷却時の各部温度の時間変化の例を示す図である。定圧6barで冷却を行った。炉制御温度は、冷却開始後、1025℃から急速に低下し、30分後では約60℃になる。ダイカスト金型の中心部は、30分後では約500℃、1時間後では約270℃、1時間30分後では約120℃、2時間後では約60℃となった。
一方、凹部は、30分後では約440℃、1時間後では約240℃、1時間30分後では約105℃、2時間後では約60℃となった。
従ってダイカスト金型の中心部と凹部の温度差は、30分後では約60deg、1時間後では30deg、1時間30分後では約15degとなった。
FIG. 6 is a diagram showing an example of a time change of each part temperature at the time of spot cooling of the die casting mold according to the present invention. Cooling was performed at a constant pressure of 6 bar. The furnace control temperature decreases rapidly from 1025 ° C. after the start of cooling, and reaches about 60 ° C. after 30 minutes. The center of the die casting mold was about 500 ° C. after 30 minutes, about 270 ° C. after 1 hour, about 120 ° C. after 1 hour 30 minutes, and about 60 ° C. after 2 hours.
On the other hand, the recess was about 440 ° C. after 30 minutes, about 240 ° C. after 1 hour, about 105 ° C. after 1 hour 30 minutes, and about 60 ° C. after 2 hours.
Therefore, the temperature difference between the central portion and the concave portion of the die casting mold was about 60 deg after 30 minutes, 30 deg after 1 hour, and about 15 deg after 1 hour and 30 minutes.
図7は、スポット冷却を行わない場合の各部温度の時間変化の例を示す図である。定圧6barで冷却を行った。炉制御温度は、冷却開始後、1025℃から急速に低下し、30分後では約60℃になる。ダイカスト金型の中心部は、30分後では約510℃、1時間後では約290℃、1時間30分後では約135℃、2時間後では約70℃となった。
一方、凹部は、30分後では約500℃、1時間後では約280℃、1時間30分後では約130℃、2時間後では約70℃となった。
従ってダイカスト金型の中心部と凹部の温度差は、30分後では約10deg、1時間後では10deg、1時間30分後では約5degとなった。
このように、 凹部は中心部とほとんど冷却速度が変わらない結果となった。凹部は平面部より冷めにくいことがわかる。従来の冷却方法では、冷却炉の性能を上げると冷却対象の製品全体の冷却速度は上がるが、凹部と中心部の冷却速度の差は変わらない。言い換えれば、凹部と平面部の冷却速度の差は縮まらない。
FIG. 7 is a diagram illustrating an example of a temporal change of each part temperature when spot cooling is not performed. Cooling was performed at a constant pressure of 6 bar. The furnace control temperature decreases rapidly from 1025 ° C. after the start of cooling, and reaches about 60 ° C. after 30 minutes. The center of the die casting mold was about 510 ° C. after 30 minutes, about 290 ° C. after 1 hour, about 135 ° C. after 1 hour 30 minutes, and about 70 ° C. after 2 hours.
On the other hand, the recess was about 500 ° C. after 30 minutes, about 280 ° C. after 1 hour, about 130 ° C. after 1 hour 30 minutes, and about 70 ° C. after 2 hours.
Therefore, the temperature difference between the central portion and the concave portion of the die casting mold was about 10 deg after 30 minutes, 10 deg after 1 hour, and about 5 deg after 1 hour 30 minutes.
In this way, the cooling rate of the concave portion was almost the same as that of the central portion. It turns out that a recessed part is harder to cool than a plane part. In the conventional cooling method, when the performance of the cooling furnace is increased, the cooling rate of the entire product to be cooled increases, but the difference in cooling rate between the concave portion and the central portion does not change. In other words, the difference in cooling rate between the concave portion and the flat portion is not reduced.
図8は、ダイカスト金型の凹部におけるスポット冷却を行なった場合と行わない場合との温度の時間変化の例を示す図である。本発明に係るスポット冷却を行なった場合と行わない場合との凹部の温度差は、30分後で約60deg、1時間後では約40deg、1時間30分後では約25deg、2時間後では約10degとなった。
スポット無しの場合に比べるとスポット有りの場合の冷却は3分程速くなっていることから、スポット冷却の効果が認められ、内部組織もスポット無しの場合に比べてより良いものとなっていることが推測される。
FIG. 8 is a diagram illustrating an example of a temporal change in temperature with and without spot cooling in the concave portion of the die casting mold. The temperature difference in the recesses between when spot cooling is performed and when spot cooling is not performed is about 60 deg after 30 minutes, about 40 deg after 1 hour, about 25 deg after 1 hour and 30 minutes, and about 25 deg after 2 hours. 10 deg.
Compared to the case without spot, the cooling with spot is about 3 minutes faster, so the effect of spot cooling is recognized and the internal structure is better than without spot. Is guessed.
以上のように、本発明の実施形態に係るダイカスト金型の冷却装置およびその方法によれば、 凹部の冷却速度は平面部の冷却速度の約1/3の冷却速度になる。従って、平面部と凹部の冷却温度の差を近づけることにより、ダイカスト金型の割れ、変形の防止、内部組織の向上を図ることができる。 As described above, according to the die-casting die cooling apparatus and method according to the embodiment of the present invention, the cooling rate of the concave portion is about 1/3 of the cooling rate of the flat portion. Therefore, by bringing the difference in cooling temperature between the flat portion and the concave portion closer, it is possible to prevent cracking and deformation of the die casting mold and improve the internal structure.
凹部の冷却は重要であるが、従来の冷却方法では冷却性能の向上を図ろうとしても、製品全体の冷却速度は上がるが、凹部と平面部の冷却速度の差は縮まらない。以下に示す実験では、図3に示したL型テストピース4を使用し、「加圧ガス冷」、「加圧ガス冷+スポット冷却」、「高温油冷」という3種類の冷却方法をテストして、スポット冷却効果の有効性確認を実施した。
スポット冷却装置は、3本のスポット冷却用フレキシブルホース3の一方を、図1の様に凹部が集中的に冷却されるよう固定し、スポット冷却用フレキシブルホース3のもう一方を炉内冷却ガス噴出口2にセットする。このスポット冷却の効果により、通常のガス冷の方法に比べて凹部の冷却速度を速くして、平面部と凹部の冷却温度の差を近づけることを目指す。
Although cooling of the recesses is important, even if the conventional cooling method attempts to improve the cooling performance, the cooling rate of the entire product increases, but the difference between the cooling rates of the recesses and the flat part is not reduced. In the experiment shown below, the L-shaped test piece 4 shown in FIG. 3 is used, and three types of cooling methods of “pressurized gas cooling”, “pressurized gas cooling + spot cooling”, and “high temperature oil cooling” are tested. Thus, the effectiveness of the spot cooling effect was confirmed.
In the spot cooling device, one of the three spot cooling flexible hoses 3 is fixed so that the concave portions are cooled intensively as shown in FIG. 1, and the other of the spot cooling flexible hoses 3 is injected into the furnace cooling gas jet. Set at exit 2. By the effect of this spot cooling, it aims at making the cooling rate of a recessed part quick compared with the normal gas cooling method, and making the difference of the cooling temperature of a plane part and a recessed part close.
図9は、本実験でのダイカスト金型のスポット冷却方法における焼入れサイクルを示す図である。1025℃までの加熱過程は図5と同様である。本実験の冷却条件としては、「加圧ガス冷」、「加圧ガス冷+スポット冷却」についてはともに、冷却全域を炉内6bar、2hrでガス冷を行う。これに対して「高温油冷」については、中心温度650℃までの冷却を炉内6barで行い、その後に炉から取り出し、250℃まで油冷を行う。 FIG. 9 is a diagram showing a quenching cycle in the spot cooling method of the die casting mold in this experiment. The heating process up to 1025 ° C. is the same as in FIG. As cooling conditions for this experiment, both “pressurized gas cooling” and “pressurized gas cooling + spot cooling” are performed by gas cooling in the entire furnace at 6 bar and 2 hr. On the other hand, with regard to “high temperature oil cooling”, cooling to a central temperature of 650 ° C. is performed in the furnace at 6 bar, and then taken out from the furnace and oil cooling is performed to 250 ° C.
図10は、「高温油冷」、「加圧ガス冷(スポット無し)」、「加圧ガス冷+スポット冷却(スポット有り)」の各冷却方法におけるダイカスト金型の中心部の温度の時間変化の実験結果の例を示す図である。表1は、ダイカスト金型の中心部の温度の測定値を示す表である。
FIG. 10 shows the time variation of the temperature at the center of the die casting mold in each cooling method of “high temperature oil cooling”, “pressurized gas cooling (no spot)”, “pressurized gas cooling + spot cooling (with spot)”. It is a figure which shows the example of this experimental result. Table 1 is a table showing measured values of the temperature at the center of the die casting mold.
図11は、「高温油冷」、「加圧ガス冷(スポット無し)」、「加圧ガス冷+スポット冷却(スポット有り)」の各冷却方法におけるダイカスト金型の凹部の温度の時間変化の実験結果の例を示す図である。表2は、ダイカスト金型の凹部の温度の測定値を示す表である。
FIG. 11 shows changes in the temperature of the concave portion of the die casting mold over time in the respective cooling methods of “high temperature oil cooling”, “pressurized gas cooling (no spot)”, and “pressurized gas cooling + spot cooling (with spot)”. It is a figure which shows the example of an experimental result. Table 2 is a table | surface which shows the measured value of the temperature of the recessed part of a die-casting metal mold | die.
これらの実験結果を見ると、中心部の初期冷却は、上記3種類の冷却方法とも炉内で行っている為、ほとんど差は出ていないが、後期冷却においては、やはり「高温油冷」の冷却速度が「加圧ガス冷」、「加圧ガス冷+スポット冷却」よりも勝っている。過去の実績から冷却速度は、「油冷」>「ガス冷」であるため順当な結果と言える。「スポット有り」と「スポット無し」の結果を比較してみると、中心部であっても若干ではあるがスポット冷却効果のあることが見て取れる。
次に凹部の冷却比較を見てみると、初期冷却、後期冷却ともにはっきりとスポット冷却効果のあることが見て取れ、ほぼ「高温油冷」と同程度の冷却速度が得られた。
「高温油冷」では部分冷却が困難である為、本スポット冷却方法は金型凹部冷却方法として有効な手段と思われる。
以上のことから、本発明に係るスポット冷却を用いた冷却方法は、金型凹部の特性改善、内部組織の向上に繋がり、製品の品質にも良い影響を及ぼすものであると言える。
Looking at these experimental results, the initial cooling of the central part is performed in the furnace with the above three types of cooling methods, so there is almost no difference, but in the latter cooling, “high temperature oil cooling” Cooling rate is better than “Pressurized gas cooling” and “Pressurized gas cooling + spot cooling”. From the past results, the cooling rate is “oil cooling”> “gas cooling”. Comparing the results of “with spot” and “without spot”, it can be seen that there is a slight spot cooling effect even at the center.
Next, looking at the cooling comparison of the recesses, it was found that there was a clear spot cooling effect in both the initial cooling and the latter cooling, and a cooling rate almost the same as that of “high temperature oil cooling” was obtained.
Since partial cooling is difficult with “high temperature oil cooling”, this spot cooling method seems to be an effective means for cooling the mold recesses.
From the above, it can be said that the cooling method using spot cooling according to the present invention leads to improvement of the characteristics of the mold recess and improvement of the internal structure, and has a positive influence on the quality of the product.
本発明は、以上述べた実施形態に限定されることはなく、他にも種々の実施形態を採用することができる。スポット冷却用フレキシブルホース 3の形状や数は適宜変更しても良い。例えば、スポット冷却用フレキシブルホース 3の先端にノズルを取り付け、小さな突出孔から複数の高速フローを出すような構成にしても良い。 The present invention is not limited to the embodiments described above, and various other embodiments can be adopted. You may change suitably the shape and number of the flexible hose 3 for spot cooling. For example, a nozzle may be attached to the tip of the spot cooling flexible hose 3 so that a plurality of high-speed flows are emitted from small protruding holes.
本発明は、ダイカスト金型の冷却装置およびその方法等に利用可能である。 INDUSTRIAL APPLICABILITY The present invention can be used for a die casting die cooling apparatus and method.
1 冷却炉
2 冷却ガス吹き出し口
3 スポット冷却用フレキシブルホース
4 L型ダイカスト金型テストピース
5A 凹部温度センサ
5B 中心部温度センサ
DESCRIPTION OF SYMBOLS 1 Cooling furnace 2 Cooling gas outlet 3 Spot hose flexible hose 4 L type die-casting die test piece 5A Recess temperature sensor 5B Center temperature sensor
Claims (2)
前記スポット冷却用ホースの先端を、前記冷却炉内の金型の凹部近傍に設置し、冷却ガスを直接前記金型の凹部に当てて、前記金型を冷却することを特徴とする金型の冷却装置。 With a spot cooling hose connected to the cooling gas outlet in the cooling furnace,
The tip of the spot cooling hose is installed in the vicinity of the recess of the mold in the cooling furnace, and the mold is cooled by directly applying a cooling gas to the recess of the mold. Cooling system.
前記スポット冷却用ホースの先端を、前記冷却炉内の金型の凹部近傍に設置し、冷却ガスを直接前記金型の凹部に当てて、前記金型を冷却する工程を含むことを特徴とする金型の冷却方法。 In a cooling furnace equipped with a spot cooling hose connected to a cooling gas outlet in the cooling furnace,
The tip of the spot cooling hose is installed in the vicinity of the concave portion of the mold in the cooling furnace, and the cooling gas is directly applied to the concave portion of the mold to cool the mold. Mold cooling method.
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JP2015178643A (en) * | 2014-03-18 | 2015-10-08 | 日立金属株式会社 | Hardening method for mold and method for manufacturing mold |
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JPS63255319A (en) * | 1987-04-11 | 1988-10-21 | Daido Steel Co Ltd | Vacuum heat treatment furnace |
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JPH08150422A (en) * | 1994-11-29 | 1996-06-11 | Nissan Motor Co Ltd | Formation of aluminum or aluminum alloy sheet and forming die therefor |
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