JP6424655B2 - Hardening method of casting raw material - Google Patents

Hardening method of casting raw material Download PDF

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JP6424655B2
JP6424655B2 JP2015019158A JP2015019158A JP6424655B2 JP 6424655 B2 JP6424655 B2 JP 6424655B2 JP 2015019158 A JP2015019158 A JP 2015019158A JP 2015019158 A JP2015019158 A JP 2015019158A JP 6424655 B2 JP6424655 B2 JP 6424655B2
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casting
raw material
cooling
mist
refrigerant
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JP2016141851A (en
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圭 倉田
圭 倉田
徹也 中島
徹也 中島
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Toyota Motor Corp
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Description

本発明は、鋳造粗材の焼入方法に関する。   [0001] The present invention relates to a method of quenching a casting blank.

特許文献1に開示されているように、ミスト状の冷却用液体を鋳造粗材にシャワリングすることによって、焼き入れを行う鋳造粗材の焼入方法がある。具体的には、略直方体状の押湯と、略直方体状の製品部とを有する鋳造粗材を、略直方体状の鋳型に拘束させたまま、シャワリングする。また、その押湯側とその反対側とでは、異なるタイミングでシャワリングを行う。   As disclosed in Patent Document 1, there is a method of quenching a casting crude material in which quenching is performed by showering mist-like cooling liquid onto the casting crude material. Specifically, the casting raw material having the substantially rectangular parallelepiped feeder and the substantially rectangular parallelepiped product portion is showered while being restrained by the substantially rectangular mold. Also, showering is performed at different timings on the side of the feeder and the opposite side.

特開2014−057977号公報JP, 2014-057977, A

鋳造粗材を、鋳型から取り出して、焼入処理を実施することがある。特許文献1で開示される鋳造粗材の焼入方法を用いて、このような焼入処理を行うと、各部位において冷却度合いが異なり、その各部位に歪みが生じるおそれがあった。   The cast blank may be removed from the mold and subjected to a quenching treatment. When such a quenching treatment is performed using the method of quenching the casting crude material disclosed in Patent Document 1, the degree of cooling differs in each portion, and there is a possibility that distortion occurs in each portion.

本発明は、歪みが生じにくい鋳造製品を提供する。   The present invention provides a cast product that resists distortion.

本発明にかかる鋳造粗材の焼入方法は、
鋳造粗材の焼入方法であって、
ミスト状の冷媒を鋳造粗材の全体に噴射することによって、前記鋳造粗材を冷却する全体冷却工程と、
前記鋳造粗材の歪パターンに応じて、ミスト状の冷媒を前記鋳造粗材の各部位に噴射することによって、前記鋳造粗材を冷却する部分冷却工程と、を含む。
The method of quenching a casting raw material according to the present invention is
It is a method of quenching of casting raw material,
An overall cooling step of cooling the casting crude material by injecting a mist-like refrigerant into the entire casting crude material;
And a partial cooling step of cooling the casting crude material by injecting a mist-like refrigerant to the respective portions of the casting crude material in accordance with a strain pattern of the casting crude material.

このような構成によれば、鋳造粗材の歪パターンに応じて、鋳造粗材の各部位に合せて冷却して、均一な冷却速度で冷却することができる。したがって、鋳造製品に歪みが生じにくい。   According to such a configuration, according to the strain pattern of the casting crude material, it is possible to cool according to each portion of the casting crude material and to cool at a uniform cooling rate. Therefore, distortion does not occur easily in cast products.

本発明によれば、歪みが生じにくい鋳造製品を提供することができる。   According to the present invention, it is possible to provide a cast product which is less likely to be distorted.

実施の形態1にかかる鋳造製品の製造方法のフローチャートである。5 is a flowchart of a method of manufacturing a cast product according to the first embodiment. 実施の形態1にかかる鋳造製品の製造方法の一工程を示す図である。FIG. 5 is a diagram showing a process of the method of manufacturing a cast product according to the first embodiment. 実施の形態1にかかる鋳造製品の製造方法の一工程を示す図である。FIG. 5 is a diagram showing a process of the method of manufacturing a cast product according to the first embodiment. 経過時間に対する温度を示すグラフである。It is a graph which shows the temperature with respect to elapsed time. 冷却箇所を示す図である。It is a figure which shows a cooling location. 冷却箇所を示す図である。It is a figure which shows a cooling location. 冷却箇所を示す図である。It is a figure which shows a cooling location.

実施の形態1.
図1を参照しつつ、図2〜図7を用いて、実施の形態1にかかる鋳造製品の製造方法について説明する。図1は、実施の形態1にかかる鋳造製品の製造方法のフローチャートである。図2及び図3は、実施の形態1にかかる鋳造製品の製造方法の一工程を示す図である。図4は、経過時間に対する温度を示すグラフである。図5〜図7は、冷却箇所を示す図である。
Embodiment 1
The manufacturing method of the cast product concerning Embodiment 1 is demonstrated using FIGS. 2-7, referring FIG. FIG. 1 is a flowchart of a method of manufacturing a cast product according to the first embodiment. FIG.2 and FIG.3 is a figure which shows 1 process of the manufacturing method of the cast product concerning Embodiment 1. FIG. FIG. 4 is a graph showing temperature against elapsed time. 5-7 is a figure which shows a cooling location.

まず、ダイカスト鋳造を行ない、鋳造粗材Wを成形する(ダイカスト鋳造工程S1)。具体的には、例えば、アルミニウム合金からなる溶湯を金型キャビティに射出し凝固させることで、鋳放し品を得る。この鋳放し品から湯道やバリを除去した後で、所定の温度まで冷却すると、鋳造粗材Wが得られる。鋳造粗材Wは、溶体化処理可能な金属材料、例えば、アルミニウム合金からなる筐体である。鋳造粗材Wは、本体W1と、本体W1の側面から延びる延長部W2とを有する。鋳造粗材Wは、各部位によって、薄い薄肉部(図示略)と、薄肉部と比較して厚い厚肉部(図示略)とを有する。   First, die casting is performed to form a casting rough material W (die casting process S1). Specifically, for example, a molten metal made of an aluminum alloy is injected into a mold cavity and solidified to obtain an as-cast product. After the runner and burrs are removed from the as-cast product, the casting raw material W is obtained by cooling to a predetermined temperature. The casting raw material W is a case made of a solutionable metallic material, such as an aluminum alloy. The cast blank W has a main body W1 and an extension W2 extending from the side surface of the main body W1. The casting raw material W has a thin thin portion (not shown) and a thick portion (not shown) which is thicker than the thin portion depending on each portion.

続いて、鋳造粗材Wに熱処理を施す。熱処理工程は、溶体化処理工程S2と、全体冷却工程S3と、部分冷却工程S4と、時効処理工程S5とを含む。全体冷却工程S3と部分冷却工程S4とは、焼入工程に相当する。   Subsequently, heat treatment is performed on the casting raw material W. The heat treatment process includes a solution treatment process S2, a whole cooling process S3, a partial cooling process S4, and an aging process S5. The whole cooling step S3 and the partial cooling step S4 correspond to a quenching step.

鋳造粗材Wに溶体化処理を施す(溶体化処理工程S2)。具体的には、鋳造粗材Wを構成する金属材料の溶体化温度に到達するまで、鋳造粗材Wを所定時間加熱する。   The casting raw material W is subjected to a solution treatment (solution treatment step S2). Specifically, the casting crude material W is heated for a predetermined time until the solution temperature of the metal material constituting the casting crude material W is reached.

続いて、溶体化処理を施された鋳造粗材Wの全体にミストを噴射して、所定の温度T1に下降するまで急冷する(全体冷却工程S3)。所定の温度T1は、鋳造粗材Wが殆ど溶体化しない温度範囲における最大値である。急冷すると、鋳造粗材Wの機械的強度が殆ど決定する。   Subsequently, mist is injected over the entire casting raw material W subjected to the solution treatment, and quenching is performed until the temperature drops to a predetermined temperature T1 (overall cooling step S3). The predetermined temperature T1 is the maximum value in the temperature range in which the casting rough W hardly dissolves. When quenched, the mechanical strength of the cast blank W is almost determined.

具体的には、全体冷却工程S3では、図2及び図3に示すように、冷媒供給源(図示略)から供給された冷媒を導く複数の冷媒供給管1と、冷媒供給管1に設置されるミストノズル2とを用いる。ここでは、冷媒は、例えば、水である。ミストノズル2は、冷媒を冷媒供給管1から供給されて、この冷媒をミスト化して噴射する。複数の冷媒供給管1は、所定の位置に配置される。   Specifically, in the overall cooling step S3, as shown in FIGS. 2 and 3, a plurality of refrigerant supply pipes 1 for guiding the refrigerant supplied from a refrigerant supply source (not shown) and the refrigerant supply pipe 1 And the mist nozzle 2 are used. Here, the refrigerant is, for example, water. The mist nozzle 2 is supplied with a refrigerant from the refrigerant supply pipe 1, and mists and injects the refrigerant. The plurality of refrigerant supply pipes 1 are disposed at predetermined positions.

まず、溶体化処理を施された鋳造粗材Wを、ミスト状の冷媒の噴射される位置に搬送する。ミスト状の冷媒をミストノズル2から鋳造粗材Wの全体に向かって噴射する。この噴射は、この鋳造粗材Wが温度T1に下降するまで行う。図4に示すように、所定の温度T1は、例えば、200℃である。この鋳造粗材Wが温度T1に下降した後で、その各部位の変形量を計測する。この鋳造粗材Wの各部位の変形量は、歪パターンである。鋳造粗材Wは、部位によって異なる変形量を有する。変形量が所定の範囲内にある場合をOK(合格)と判定し、所定の範囲外にある場合をNG(不合格)と判定した。ここでは、鋳造粗材Wでは、NG(不合格)と判定された部位が有った。   First, the casting raw material W subjected to the solution treatment is conveyed to a position where the mist-like refrigerant is injected. A mist-like refrigerant is injected from the mist nozzle 2 toward the entire casting rough material W. This injection is performed until the casting material W drops to the temperature T1. As shown in FIG. 4, the predetermined temperature T1 is, for example, 200 ° C. After the casting raw material W is lowered to the temperature T1, the amount of deformation of each portion is measured. The amount of deformation of each portion of the casting raw material W is a strain pattern. The cast blank W has a different amount of deformation depending on the part. When the deformation amount was within the predetermined range, it was determined as OK (pass), and when outside the predetermined range, it was determined as NG (fail). Here, in the casting material W, there was a portion determined as NG (reject).

続いて、鋳造粗材Wの凸部を冷却する(部分冷却工程S4)。鋳造粗材Wの凸部は、例えば、他の各部位と比較して厚い肉を有する肉厚部である。具体的には、図5に示すように、鋳造粗材Wの本体W1の部位W1a、W1b、W1c、W1d、W1e、W1f、W1gに、ミストノズル2からミストを噴射して、冷却する。また、図6に示すように、鋳造粗材Wの本体W1の部位W1h、W1i、W1j、W1k、W1l、W1mに、ミストノズル2からミストを噴射して、冷却する。また、図7に示すように、鋳造粗材Wの延長部W2の部位W2a、W2b、W2c、W2dに、ミストノズル2からミスト状の冷媒を噴射して、冷却する。ここでは、凸部は、鋳造粗材Wの本体W1の部位W1a〜W1mと、延長部W2の部位W2a〜W2dとである。鋳造粗材Wの本体W1の部位W1a〜W1mと、延長部W2の部位W2a〜W2dとは、各部位の変形量、つまり、歪パターンに応じて、冷却度合がそれぞれ異なるように、ミスト状の冷媒を噴射する。具体的には、この各部位の冷却度合は、噴射した冷媒の量や、温度によって、決定される。部分冷却工程S4の完了後、鋳造粗材Wでは、NG(不合格)と判定された部位がほとんど無かった。   Then, the convex part of the casting raw material W is cooled (partial cooling process S4). The convex part of the casting raw material W is, for example, a thick part having a thick wall as compared with the other parts. Specifically, as shown in FIG. 5, mist is sprayed from the mist nozzle 2 to the portions W1a, W1b, W1c, W1d, W1e, W1f, W1g of the main body W1 of the casting raw material W, and is cooled. Further, as shown in FIG. 6, mist is sprayed from the mist nozzle 2 to the portions W1h, W1i, W1j, W1k, W1l and W1m of the main body W1 of the casting raw material W to cool them. Further, as shown in FIG. 7, a mist-like refrigerant is injected from the mist nozzle 2 to the portions W2a, W2b, W2c, W2d of the extended portion W2 of the casting raw material W, and is cooled. Here, the convex portions are the portions W1a to W1m of the main body W1 of the casting raw material W and the portions W2a to W2d of the extension portion W2. The portions W1a to W1m of the main body W1 of the casting raw material W and the portions W2a to W2d of the extension portion W2 are mist-like so that the degree of cooling differs according to the amount of deformation of each portion, that is, the strain pattern. Inject the refrigerant. Specifically, the degree of cooling of each portion is determined by the amount of refrigerant injected and the temperature. After completion of the partial cooling step S4, in the casting raw material W, there were almost no portions determined as NG (reject).

続いて、鋳造粗材Wを矯正し、鋳造製品(図示略)を得る(矯正工程S6)、寸法精度を確保する。最後に、硬度検査や蛍光探傷法を用いて、鋳造製品を検査する(検査工程S7)。   Subsequently, the casting material W is corrected to obtain a cast product (not shown) (correction step S6), and dimensional accuracy is secured. Finally, the cast product is inspected using a hardness inspection or a fluorescent inspection method (inspection step S7).

以上、実施の形態1にかかる鋳造製品の製造方法によれば、歪みの発生を抑制することができる。   As mentioned above, according to the manufacturing method of the cast product concerning Embodiment 1, generation | occurrence | production of distortion can be suppressed.

なお、本発明は上記実施の形態に限られたものではなく、趣旨を逸脱しない範囲で適宜変更することが可能である。   The present invention is not limited to the above embodiment, and can be appropriately modified without departing from the scope of the present invention.

S3 全体冷却工程 S4 部分冷却工程
W 鋳造粗材
W1a〜W1m、W2a〜d 部位
S3 Whole cooling process S4 Partial cooling process W Casting raw materials W1a to W1m, W2a to d parts

Claims (1)

鋳造粗材の焼入方法であって、
ミスト状の冷媒を鋳造粗材の全体に噴射することによって、前記鋳造粗材を第1の冷却速度で急冷する全体冷却工程と、
前記全体冷却工程の後、前記鋳造粗材の歪パターンに応じて、ミスト状の冷媒を前記鋳造粗材の各部位に噴射することによって、前記鋳造粗材を前記第1の冷却速度よりも遅い第2の冷却速度で冷却する部分冷却工程と、を含む
鋳造粗材の焼入方法。
It is a method of quenching of casting raw material,
By injecting a mist-like refrigerant throughout the cast coarse material, the entire cooling step quench the cast coarse material at a first cooling rate,
After the entire cooling step , according to the strain pattern of the casting rough material, mist-like refrigerant is injected to each portion of the casting rough material to make the casting rough material slower than the first cooling rate A partial cooling step of cooling at a second cooling rate ;
Method of quenching of casting raw material.
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JPS58494B2 (en) * 1975-01-31 1983-01-06 日本鋼管株式会社 It's a good idea to have a good time
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JP2007146204A (en) * 2005-11-25 2007-06-14 Nissan Motor Co Ltd Heat-treatment apparatus for aluminum alloy material and heat-treatment method therefor
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