JPH0455775B2 - - Google Patents
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- Publication number
- JPH0455775B2 JPH0455775B2 JP62004630A JP463087A JPH0455775B2 JP H0455775 B2 JPH0455775 B2 JP H0455775B2 JP 62004630 A JP62004630 A JP 62004630A JP 463087 A JP463087 A JP 463087A JP H0455775 B2 JPH0455775 B2 JP H0455775B2
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- JP
- Japan
- Prior art keywords
- cooling
- mold
- heating
- molding
- casting
- Prior art date
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Description
Ａ 発明の目的
(1) 産業上の利用分野
本発明は金型鋳造法、特に、硬い組織の第１構
成部と、軟らかい組織の第２構成部とを備えた鋳
物を金型により鋳造する方法に関する。
(2) 従来の技術
従来、この種鋳造法として、金型の第１構成部
成形領域を冷却水により急冷し、また金型の第２
構成部成形領域をシエル砂等よりなるブロツクに
よつて急冷を防止するといつた手法が知られてい
る。
(3) 発明が解決しようとする問題点
しかしながら前記従来法においては、第１およ
び第２構成部成形領域間の熱的遮断が積極的に行
われていないために、両領域間相互に熱伝導が活
発に行われ、またその熱伝導の態様も一定してい
ないので、両構成部の組織が目標とする組織から
掛離れたものになるといつた問題がある。
本発明は前記に鑑み、目標とする組織を持つ第
１および第２構成部を備えた鋳物を得ることので
きる前記金型鋳造法を提供することを目的とす
る。
Ｂ 発明の構成
(1) 問題点を解決するための手段
上記目的を達成するために本発明は、硬い組織
の第１構成部と、軟らかい組織の第２構成部とを
有する鋳物を鋳造するに当たり、前記第１構成部
を成形するための第１成形面を有する急冷体と、
前記第２構成部を成形するための第２成形面を有
して前記急冷体に接合される徐冷体と、前記急冷
体及び徐冷体の接合面間に介在する断熱材とを備
える金型を使用し、注湯前に前記急冷体の温度が
徐冷体の温度よりも低くなるように前記金型を、
該金型に設けた加熱装置により加熱し、また注湯
開始に伴い前記加熱装置による金型に対する加熱
を停止するか又はその加熱量を減少した状態で、
前記急冷体に設けた急冷体用冷却装置により前記
１成形面を急冷すると共に、前記徐冷体に設けた
徐冷体用冷却装置により前記第２成形面を徐冷す
ることを特徴とする。
(2) 作用
注湯前の金型加熱により、キヤビテイ内におけ
る湯流れ性が良好になる。またこの金型加熱によ
つて急冷体及び徐冷体間に、前者が後者よりも低
くなるように温度差を生じさせることができ、そ
の際に断熱材は、上筋温度差を明確にする上で有
効である。
そして注湯開始に伴い、加熱装置による金型に
対する加熱を停止するか又はその加熱量を減少し
た状態で、急冷体用冷却装置によつて急冷体の第
１成形面が急速に冷却されると共に、徐冷体用冷
却装置によつて徐冷体の第２成形面が緩やかに冷
却されるため、前述の如く急冷体及び徐冷体間に
注湯前から温度差が存在し且つ断熱材が介在する
ことと相俟つて、第１及び第２成形面の相互間に
は明確な温度差が現れ、その結果、鋳物の第１構
成部を硬い組織に、また第２構成部を軟らかい組
織にすることができる。
(3) 実施例
第１図は鋳鉄鋳物としてのカム軸１を示し、そ
のカム軸１は複数のカム部２、軸部３およびジヤ
ーナル部４を備えている。第１構成部としての、
各カム部２のノーズ部分２ａは硬い組織、この場
合はチル組織であり、第２構成部としての、カム
軸１の他の部分、即ち各カム部２の円弧部分２
ｂ、各軸部３および各ジヤーナル部４は軟らかい
組織、この場合は共晶黒鉛または片状黒鉛組織で
ある。
第２〜第７図は、カム軸１を鋳造するための金
型５を備えた鋳造装置Ｍを示す。金型５は、第１
型５1と第２型５2とより二つ割に構成され、第１
および第２型５1，５2の合せ面５ａにより湯口
６、ランナ７、ゲート８、カム軸成形用キヤビテ
イ９および押湯口１０がそれぞれ画成される。
第１および第２型５1，５2は略同一の構成を有
するので、第１型５1について説明する。第１型
５1は、湯口６、ランナ７およびゲート８を有す
る本体１１と、キヤビテイ９および押湯口１０を
有し、本体１１の凹部１２に断熱材１３1を介し
て嵌着された成形ブロツク１４とよりなる。
成形ブロツク１４は、前記第２構成部を成形す
るための第２成形面としての、カム部２のノーズ
部分２ａを除く円弧部分２ｂの全体または半分に
対応した円弧部分成形地帯a1，a2（第４，第５図）
並びに軸部３及びジヤーナル部４にそれぞれ対応
した軸部及びジヤーナル部成形地帯ｂ，ｃを有す
る徐冷体１５と、この徐冷体１５に接合される複
数の板状急冷体１８1，１８2とを備えている。そ
れら急冷体１８1，１８2は、前記第１構成部を成
形するための第１成形面としての、カム部２のノ
ーズ部分２ａの全体または半分に対応したノーズ
部分成形地帯d1，d2（第５図，第６図）を有する
ものであつて、前記第１型５1の本体１１および
徐冷体１５の貫通孔１６，１７に装着されてい
る。
徐冷体１５と各急冷体１８1，１８2との間に前
記と同様の断熱材１３2が介装されるが、徐冷体
１５と急冷体１８1，１８2とは合せ面５ａ近傍に
おいて直接接触している。これにより徐冷体１５
と急冷体１８1，１８2との間には熱伝導が行われ
るが、それは大幅に抑制される。
本体１１および急冷体１８1，１８2は0.8〜４
重量％のCrを含有するCu−Cr合金より構成され、
その熱伝導率は0.4〜0.8cal／cm／ｓ／℃である。
徐冷体１５は黒鉛より構成され、その熱伝導率
は0.005〜0.4cal／cm／ｓ／℃である。徐冷体１５
の構成材料としては、黒鉛の外にセラミツク、銅
合金、鋼等を用いることが可能であるが、何れの
場合にも急冷体１８1，１８2よりも熱伝導率の低
いものが良い。
断熱材１３1，１３2としてはアルミナ繊維、シ
リカ繊維等の無機繊維よりなるセラミツクシート
が用いられている。
本体１１に冷却回路C1が設けられ、その冷却
回路C1は湯口６に沿つて本体１１に穿設された
垂直な冷却水用導入路１９と、成形ブロツク１４
に沿つて本体１１に穿設された垂直な冷却水用排
出路２０と、両者１９，２０をそれらの下部で接
続すべく本体１１に穿設された水平な連通路２１
とより構成される。
また徐冷体１５には、加熱装置としての加熱回
路Ｈと、徐冷体用冷却装置としての冷却回路C2
とが設けられる。加熱回路Ｈは各急冷体１８1，
１８2を挟み、且つ合せ面５ａに接近させて徐冷
体１５に穿設された一対の垂直な挿入孔２２と、
各挿入孔２２に装着された棒状ヒータ２３とより
なる。また冷却回路C2は各急冷体１８1，１８2を
挟み、且つ合せ面５ａから遠去かるように徐冷体
１５に穿設された垂直な冷却水用導入および排出
路２４，２５ならびに両者をそれらの下部で接続
すべく徐冷体１５に穿設された水平な連通路２６
よりなる。この場合、徐冷体１５の体積に占める
冷却回路C2の占有体積は小さい。
さらに、各急冷体１８1，１８2には、急冷体用
冷却装置としての冷却回路C3が設けられ、その
冷却回路C3は急冷体１８1，１８2に穿設された水
平な冷却水用導入および排出路２７，２８ならび
にそれらをノーズ部分成形地帯d1，d2の近傍で接
続する水平な連通路２９よりなる。この場合、急
冷体１８1，１８2の体積に占める冷却回路C3の占
有体積は大きい。
第１、第２型５1，５2における加熱回路Ｈの各
ヒータ２３は加熱制御器Chに接続される。その
加熱制御器Chは注湯に先立つて各ヒータ２３に
通電して徐冷体１５を加熱し、また注湯開始に伴
い各ヒータ２３への通電を停止する機能を備えて
いる。
前記加熱時において、徐冷体１５からの熱伝導
によつて急冷体１８1，１８2も加熱されるが、両
者１５；１８1，１８2間には断熱材１３2が介在
しており、また両者１５，１８1，１８2の直接接
触する部分も少ないこともあつて、前記熱伝導は
大幅に抑制され、したがつて急冷体１８1，１８2
の温度は徐冷体１５に比べて低くなり、それらの
間に明確な温度が現れる。
第１、第２型５1，５2における各冷却回路C1〜
C3の導入路１９，２４，２７および排出路２０，
２５，２８は冷却制御器Ccに接続される。その
冷却制御器Ccは注湯開始に伴い各冷却回路C1〜
C3に冷却水を流通させて本体１１、徐冷体１５
および急冷体１８1，１８2を冷却する機能を有す
る。
前記冷却時において、徐冷体１５の前記第２成
形面としての各成形地帯a1，a2，ｂ，ｃ及びその
近傍部では、該徐冷体１５自体の熱伝導率が低く
且つ冷却回路C2の前記占有体積が小さいことに
起因して比較的緩やかに冷却が行われる。一方、
急冷体１８1，１８2の前記第１成形面としての各
成形地帯d1，d2及びその近傍部では、該急冷体１
８1，１８2自体の熱伝導が高く且つ冷却回路C3の
前記占有体積が大きいことに起因して急速に冷却
が行われる。この場合、急冷体１８1，１８2と徐
冷体１５との間に断熱材１３が介在し、且つ注湯
前の前記温度差もあることから、その両者の前記
第１及び第２成形面d1，d2；a1，a2，ｂ，ｃ間に
は明確な温度差が生じる。
これにより、カム軸１の各カム部２におけるノ
ーズ部分２ａをチル組織に、またカム軸１の他の
部分を共晶黒鉛または片状黒鉛組織にすることが
できる。
次に、前記鋳造装置Ｍによるカム軸１の鋳造作
業について説明する。
先ず、表に示す、JIS FC20〜FC30相当の鋳
鉄成分の溶湯を調製する。
A. Purpose of the invention (1) Industrial application field The present invention relates to a mold casting method, particularly a method for casting a casting having a first constituent part with a hard structure and a second constituent part with a soft structure using a die. Regarding. (2) Conventional technology Conventionally, in this type of casting method, the molding area of the first component of the mold is rapidly cooled with cooling water, and the molding area of the second component of the mold is rapidly cooled.
A method is known in which rapid cooling is prevented by using a block made of shell sand or the like in the forming area of the component. (3) Problems to be Solved by the Invention However, in the conventional method described above, thermal isolation between the first and second component molding regions is not actively carried out, so that heat conduction between the two regions is poor. is actively carried out, and the mode of heat conduction is not constant, so there is a problem that the structure of both components may be far from the target structure. In view of the above, an object of the present invention is to provide the above-mentioned die casting method, which can obtain a casting having first and second constituent parts having a target structure. B. Structure of the Invention (1) Means for Solving the Problems In order to achieve the above object, the present invention provides a method for casting a casting having a first component having a hard structure and a second component having a soft structure. , a quenching body having a first molding surface for molding the first component;
A metal plate comprising: a slow cooling body having a second molding surface for molding the second component and joined to the rapid cooling body; and a heat insulating material interposed between the joining surfaces of the rapid cooling body and the slow cooling body. using a mold, and adjusting the mold so that the temperature of the rapidly cooling body is lower than the temperature of the slow cooling body before pouring,
The mold is heated by a heating device provided in the mold, and the heating of the mold by the heating device is stopped or the amount of heating is reduced when pouring starts,
The first molding surface is rapidly cooled by a cooling device for a rapidly cooling body provided on the rapidly cooling body, and the second molding surface is slowly cooled by a cooling device for a slowly cooling body provided in the slowly cooling body. (2) Effects Heating the mold before pouring the metal improves the flow of the metal in the cavity. In addition, by heating the mold, a temperature difference can be created between the rapidly cooling body and the slow cooling body so that the former is lower than the latter, and at this time, the insulation material makes the temperature difference in the upper layer clear. is valid above. Then, with the start of pouring, the first molding surface of the quenched body is rapidly cooled by the cooling device for the quenched body, while the heating of the mold by the heating device is stopped or the amount of heating is reduced. Since the second molding surface of the slow cooling body is slowly cooled by the cooling device for the slow cooling body, there is a temperature difference between the rapidly cooling body and the slow cooling body before pouring, and there is an insulating material interposed between the rapidly cooling body and the slowly cooling body as described above. In conjunction with this, a clear temperature difference appears between the first and second forming surfaces, resulting in a hard structure in the first component and a soft structure in the second component of the casting. be able to. (3) Embodiment FIG. 1 shows a camshaft 1 made of cast iron, and the camshaft 1 includes a plurality of cam parts 2, a shaft part 3, and a journal part 4. As the first component,
The nose portion 2a of each cam portion 2 is a hard tissue, in this case a chill tissue, and the other portion of the cam shaft 1, that is, the arc portion 2 of each cam portion 2, serves as a second component.
b. Each shaft portion 3 and each journal portion 4 are soft structures, in this case eutectic graphite or flake graphite structures. 2 to 7 show a casting apparatus M equipped with a mold 5 for casting the camshaft 1. As shown in FIG. The mold 5 is the first
It is composed of two parts: mold 5 1 and second mold 5 2 , and the first
A sprue 6, a runner 7, a gate 8, a camshaft molding cavity 9, and a feeder sprue 10 are respectively defined by the mating surfaces 5a of the second dies 5 1 and 5 2 . Since the first and second types 5 1 and 5 2 have substantially the same configuration, the first type 5 1 will be explained. The first mold 51 has a main body 11 having a sprue 6, a runner 7, and a gate 8, a cavity 9 and a feeder spout 10, and is a molded block fitted into a recess 12 of the main body 11 via a heat insulating material 131 . 14 and more. The molding block 14 has circular arc portion molding zones a 1 , a 2 corresponding to the whole or half of the circular arc portion 2 b excluding the nose portion 2 a of the cam portion 2 as a second molding surface for molding the second constituent portion. (Figures 4 and 5)
Also, an annealing body 15 having shank and journal forming zones b and c corresponding to the shank 3 and journal 4, respectively, and a plurality of plate-shaped quenching bodies 18 1 , 18 2 joined to this annealing body 15 . It is equipped with These rapidly cooled bodies 18 1 , 18 2 serve as a first molding surface for molding the first component, forming nose portion molding zones d 1 , d 2 corresponding to the whole or half of the nose portion 2a of the cam portion 2 . (FIGS. 5 and 6), and is attached to the main body 11 of the first mold 51 and the through holes 16 and 17 of the annealing body 15. A heat insulating material 13 2 similar to that described above is interposed between the slow cooling body 15 and each rapidly cooling body 18 1 , 18 2 , but the slow cooling body 15 and each rapid cooling body 18 1 , 18 2 are located near the mating surface 5a. are in direct contact with each other. As a result, the slow cooling body 15
Although heat conduction takes place between the cooling bodies 18 1 and 18 2 , it is greatly suppressed. The main body 11 and quenched bodies 18 1 and 18 2 are 0.8 to 4
Consisting of a Cu-Cr alloy containing Cr by weight%,
Its thermal conductivity is 0.4-0.8 cal/cm/s/°C. The slow cooling body 15 is made of graphite and has a thermal conductivity of 0.005 to 0.4 cal/cm/s/°C. Annealing body 15
In addition to graphite, ceramic, copper alloy, steel, etc. can be used as the constituent material, but in any case, it is preferable to use a material with lower thermal conductivity than the quenched bodies 18 1 and 18 2 . As the heat insulating materials 13 1 and 13 2 , ceramic sheets made of inorganic fibers such as alumina fibers and silica fibers are used. A cooling circuit C 1 is provided in the main body 11 , and the cooling circuit C 1 includes a vertical cooling water introduction passage 19 bored in the main body 11 along the sprue 6 and a forming block 14 .
A vertical cooling water discharge passage 20 is bored in the main body 11 along the vertical direction, and a horizontal communication passage 21 is bored in the main body 11 to connect both 19 and 20 at their lower parts.
It consists of The slow cooling body 15 also includes a heating circuit H as a heating device and a cooling circuit C 2 as a cooling device for the slow cooling body.
and is provided. The heating circuit H includes each rapidly cooled body 18 1 ,
A pair of vertical insertion holes 22 bored in the annealing body 15 sandwiching 18 2 and close to the mating surface 5a;
It consists of a rod-shaped heater 23 attached to each insertion hole 22. The cooling circuit C 2 includes vertical cooling water introduction and discharge passages 24 and 25 bored in the slow cooling body 15 so as to sandwich the rapid cooling bodies 18 1 and 18 2 and away from the mating surface 5a, and both A horizontal communication path 26 bored in the slow cooling body 15 to connect the
It becomes more. In this case, the volume occupied by the cooling circuit C 2 in the volume of the slow cooling body 15 is small. Furthermore, each of the quenching bodies 18 1 and 18 2 is provided with a cooling circuit C 3 as a cooling device for the quenching body, and the cooling circuit C 3 is a horizontal cooling water supply hole provided in the quenching bodies 18 1 and 18 2 . It consists of inlet and outlet passages 27, 28 and a horizontal communication passage 29 connecting them in the vicinity of the nose molding zones d1 , d2 . In this case, the volume occupied by the cooling circuit C 3 in the volume of the rapidly cooling bodies 18 1 and 18 2 is large. Each heater 23 of the heating circuit H in the first and second types 5 1 and 5 2 is connected to a heating controller Ch. The heating controller Ch has a function of heating the slow cooling body 15 by energizing each heater 23 prior to pouring the molten metal, and stopping energization of each heater 23 when pouring starts. During the heating, the rapidly cooling bodies 18 1 and 18 2 are also heated by heat conduction from the slowly cooling body 15, but a heat insulating material 13 2 is interposed between both 15; 18 1 and 18 2 , In addition, since there are few direct contact areas between the two 15, 18 1 , 18 2 , the heat conduction is greatly suppressed, and therefore the quenching bodies 18 1 , 18 2
The temperature of the cooling body 15 is lower than that of the annealing body 15, and a clear temperature appears between them. Each of the cooling circuits C 1 to 1 in the first and second types 5 1 and 5 2
C 3 inlet passages 19, 24, 27 and discharge passage 20,
25 and 28 are connected to a cooling controller Cc. The cooling controller Cc controls each cooling circuit C 1 to
Cooling water is passed through C 3 to connect the main body 11 and the slow cooling body 15.
It also has a function of cooling the rapidly cooling bodies 18 1 and 18 2 . During the cooling, the thermal conductivity of the slow cooling body 15 itself is low and the cooling circuit Due to the small occupied volume of C 2 , cooling occurs relatively slowly. on the other hand,
In each forming zone d 1 , d 2 as the first forming surface of the quenched body 18 1 , 18 2 and its vicinity, the quenched body 1
Rapid cooling is achieved due to the high thermal conductivity of 8 1 and 18 2 themselves and the large occupied volume of the cooling circuit C 3 . In this case, since the heat insulating material 13 is interposed between the rapidly cooling bodies 18 1 , 18 2 and the slow cooling body 15 and there is also the temperature difference before pouring, the first and second molding surfaces d of both of them are 1 , d 2 ; A clear temperature difference occurs between a 1 , a 2 , b, and c. This allows the nose portion 2a of each cam portion 2 of the camshaft 1 to have a chill structure, and the other portions of the camshaft 1 to have a eutectic graphite or flake graphite structure. Next, the casting operation of the camshaft 1 by the casting apparatus M will be explained. First, a molten metal having a cast iron component equivalent to JIS FC20 to FC30 as shown in the table is prepared.
【表】
前記溶湯に、カム軸１が表の組成を有するよ
うに、0.15重量％のFe−Siを添加する。[Table] 0.15% by weight of Fe-Si is added to the molten metal so that the camshaft 1 has the composition shown in the table.
【表】
金型５は、注湯に先立つて加熱回路Ｈにより加
熱され、徐冷体１５は150〜450℃に、また各急冷
体１８1，１８2は120℃にそれぞれ維持される。
この金型５に、接種後の溶湯を温度1380〜1420℃
にて注入し、カム軸１を鋳造する。この時の鋳込
重量は５Kgである。
前記のように金型５を加熱しておくと、注湯時
湯流れ性を良好にし、また溶湯の急激な冷却に起
因したカム軸１の割れ等を回避することができ
る。
注湯開始後、加熱回路Ｈによる金型５の加熱を
停止し、同時に冷却回路C1〜C3により金型５の
冷却を開始して徐冷体１５を徐冷すると共に各急
冷体１８1，１８2を急冷する。
この冷却操作を、カム軸１が凝固を終了して、
その外周全体が殻状の凝固層に変わるまで続行
し、その後型開きを行い、カム軸１を離型する。
この離型時における前記凝固層の温度は、共晶
線からその直下350℃位が良く、これによりカム
軸１の熱間割れを回避し、またカム軸１の凝固収
縮に起因した金型５の損傷を回避することができ
る。
カム軸１において、各ノーズ部分２ａは第８図
の金属組織を示す顕微鏡写真（100倍）から明ら
かなように微細なFe3C（白色部分）を析出したチ
ル組織となり、他の部分、例えばジヤーナル部４
は、第９図の金属組織を示す顕微鏡写真（100倍）
から明らかなように片状黒鉛（黒線部分）を有す
る組織となる。
前記チル組織の各ノーズ部分２ａは耐摩耗性に
優れ、また前記片状黒鉛組織のジヤーナル部４等
は靭性を有し、機械加工性も良好である。
本発明はカム軸に限らず、クランクシヤフト、
ナツクルアーム、ブレーキキヤリパ等の機械部品
の鋳造にも適用され、また鋳造材としては鋳鉄に
限らず普通鋳鋼および合金鋳鋼を使用することも
可能である。さらに溶湯開始に伴い各ヒータ２３
への通電量を減らして、金型５への加熱用熱量を
減少するように、加熱制御器Chを構成してもよ
い。
Ｃ 発明の効果
以上のように本発明の金型鋳造法によれば、注
湯前の金型加熱により、キヤビテイ内における湯
流れ性を良好にし、溶湯の急激な冷却に起因した
鋳物の割れ等の欠陥を回避することができる。ま
たこの金型加熱によつて急冷体及び徐冷体間に、
前者が後者よりも低くなるように温度差を生じさ
せることができ、その際に断熱材は、上記温度差
を明確にする上で有効である。
そして注湯開始に伴い、加熱装置による金型に
対する加熱を停止するか又はその加熱量を減少し
た状態で、急冷体用急冷装置によつて急冷体の第
１成形面が急速に冷却されると共に、徐冷体用冷
却装置によつて徐冷体の第２成形面が緩やかに冷
却されるため、前述の如く急冷体及び徐冷体間に
注湯前から温度差が存在し且つ断熱材が介在する
ことと相俟つて、第１及び第２成形面の相互間に
明確な温度差を迅速確実に生じさせることができ
ると共に、それらの温度制御も極力精度よく行う
ことができるから、硬い組織の第１構成部と軟ら
かい組織の第２構成部とを備えた鋳物を安定よく
確実に鋳造することができる。しかも注湯後は、
第１及び第２成形面の何れに対しても積極的に冷
却が行われるから、全体として鋳造時間を短くす
ることができ、鋳造能率を高めることができる。[Table] Prior to pouring, the mold 5 is heated by a heating circuit H, and the slow cooling body 15 is maintained at 150 to 450°C, and the rapidly cooling bodies 18 1 and 18 2 are maintained at 120°C.
The molten metal after inoculation is poured into this mold 5 at a temperature of 1380 to 1420℃.
and cast the camshaft 1. The casting weight at this time was 5 kg. By heating the mold 5 as described above, it is possible to improve the flowability of the molten metal during pouring and to avoid cracking of the camshaft 1 due to rapid cooling of the molten metal. After pouring starts, heating of the mold 5 by the heating circuit H is stopped, and at the same time cooling of the mold 5 is started by the cooling circuits C 1 to C 3 to slowly cool the slow cooling body 15 and each rapid cooling body 18 1 , 18 2 is rapidly cooled. This cooling operation is carried out after the camshaft 1 has finished solidifying.
The process continues until the entire outer periphery turns into a shell-like solidified layer, after which the mold is opened and the camshaft 1 is released from the mold. The temperature of the solidified layer at the time of mold release is preferably about 350°C directly below the eutectic line, thereby avoiding hot cracking of the camshaft 1 and preventing mold 5 due to solidification shrinkage of the camshaft 1. damage can be avoided. In the camshaft 1, each nose portion 2a has a chill structure in which fine Fe 3 C (white portion) is precipitated, as is clear from the micrograph (100x magnification) showing the metal structure in Fig. 8, and other portions, e.g. Journal part 4
is a micrograph (100x magnification) showing the metal structure in Figure 9.
As is clear from this, the structure has flaky graphite (black line portion). Each nose portion 2a of the chill structure has excellent wear resistance, and the journal portion 4 of the flaky graphite structure has toughness and good machinability. The present invention is applicable not only to camshafts but also to crankshafts,
It is also applied to the casting of mechanical parts such as knuckle arms and brake calipers, and the casting material is not limited to cast iron, but it is also possible to use ordinary cast steel and alloy cast steel. Furthermore, each heater 23
The heating controller Ch may be configured to reduce the amount of electricity applied to the mold 5 to reduce the amount of heat for heating the mold 5. C. Effects of the Invention As described above, according to the mold casting method of the present invention, by heating the mold before pouring the metal, the flowability of the metal in the cavity is improved, and cracks in the casting due to rapid cooling of the molten metal are prevented. Defects can be avoided. Also, due to this mold heating, between the rapidly cooled body and the slowly cooled body,
A temperature difference can be created such that the former is lower than the latter, in which case the insulation is effective in clarifying said temperature difference. Then, with the start of pouring, the first molding surface of the quenched body is rapidly cooled by the quenching device for the quenched body, while the heating of the mold by the heating device is stopped or the amount of heating is reduced. Since the second molding surface of the slow cooling body is slowly cooled by the cooling device for the slow cooling body, there is a temperature difference between the rapidly cooling body and the slow cooling body before pouring, and there is an insulating material interposed between the rapidly cooling body and the slowly cooling body as described above. In addition to this, it is possible to quickly and reliably generate a clear temperature difference between the first and second molding surfaces, and the temperature can be controlled with as much precision as possible. A casting including the first component and the second component having a soft structure can be cast stably and reliably. Moreover, after pouring hot water,
Since both the first and second molding surfaces are actively cooled, the overall casting time can be shortened and casting efficiency can be increased.
第１図はカム軸の正面図、第２ないし第７図は
鋳造装置を示し、第２図は全体の斜視図、第３図
は第２図−矢視図、第４、第５、第６図は第
３図−線、−線、−線断面図、第７
図は第６図−線断面図、第８、第９図は金属
組織を示す顕微鏡写真である。
１……鋳物としてのカム軸、２ａ……第１構成
部としてのカム部のノーズ部分、２ｂ，３，４…
…第２構成部としてのカム部の円弧部分、軸部、
ジヤーナル部、５……金型、１３1，１３2……断
熱材、１５……徐冷体、１８1，１８2……急冷
体、C2……徐冷体用冷却装置としての冷却回路、
C3……急冷体用冷却装置としての冷却回路、Ｈ
……加熱装置としての加熱回路、a1，a2；ｂ；ｃ
……第２成形面としての円弧部分成形地帯；軸部
成形地帯；ジヤーナル部成形地帯、d1，d2……第
１成形面としてのノーズ部分成形地帯。
Fig. 1 is a front view of the camshaft, Figs. 2 to 7 show the casting device, Fig. 2 is a perspective view of the whole, Fig. 3 is a view from Fig. 2 - arrow direction, and Figs. Figure 6 is a sectional view of Figure 3 - line, - line, - line, and Figure 7.
The figure is a sectional view taken along the line of FIG. 6, and FIGS. 8 and 9 are micrographs showing the metal structure. DESCRIPTION OF SYMBOLS 1...Cam shaft as a casting, 2a...Nose part of a cam part as a first component, 2b, 3, 4...
...A circular arc portion of the cam portion as a second component, a shaft portion,
Journal part, 5... Mold, 13 1 , 13 2 ... Heat insulating material, 15... Slow cooling body, 18 1 , 18 2 ... Rapid cooling body, C 2 ... Cooling circuit as a cooling device for slow cooling body ,
C 3 ...Cooling circuit as a cooling device for rapidly cooled bodies, H
... Heating circuit as a heating device, a 1 , a 2 ; b; c
...Circular part molding zone as the second molding surface; Shaft molding zone; Journal molding zone, d 1 , d 2 ...Nose part molding zone as the first molding surface.
Claims (1)
の第２構成部２ｂ，３，４とを有する鋳物１を鋳
造するに当たり、前記第１構成部２ａを成形する
ための第１成形面d1，d2を有する急冷体１８1，
１８2と、前記第２構成部２ｂ，３，４を成形す
るための第２成形面a1，a2，ｂ，ｃを有して前記
急冷体１８1，１８2に接合される徐冷体１５と、
前記急冷体１８1，１８2及び徐冷体１５の接合面
間に介在する断熱材１３1，１３2とを備える金型
５を使用し、注湯前に前記急冷体１８1，１８2の
温度が徐冷体１５の温度よりも低くなるように前
記金型５を、該金型５に設けた加熱装置Ｈにより
加熱し、また注湯開始に伴い前記加熱装置Ｈによ
る金型５に対する加熱を停止するか又はその加熱
量を減少した状態で、前記急冷体１８1，１８2に
設けた急冷体用冷却装置C3により前記１成形面
d1，d2を急冷すると共に、前記徐冷体１５に設け
た徐冷体用冷却装置C2により前記第２成形面a1，
a2，ｂ，ｃを徐冷することを特徴とする、金型鋳
造法。1. When casting a casting 1 having a first component 2a having a hard structure and second components 2b, 3, and 4 having a soft structure, a first molding surface d 1 for molding the first component 2a. , d 2 quenched body 18 1 ,
18 2 and a second molding surface a 1 , a 2 , b, c for molding the second constituent parts 2b, 3, 4, and is joined to the rapid cooling body 18 1 , 18 2 . body 15 and
A mold 5 including the rapidly cooling bodies 18 1 , 18 2 and heat insulating materials 13 1 , 13 2 interposed between the joint surfaces of the slowly cooling bodies 15 is used, and the temperature of the rapidly cooling bodies 18 1 , 18 2 is adjusted before pouring. The mold 5 is heated by a heating device H provided in the mold 5 so that the temperature becomes lower than the temperature of the slow cooling body 15, and the heating device H starts heating the mold 5 with the start of pouring. While the heating is stopped or the amount of heating is reduced, the first molding surface is cooled by the cooling device C 3 for the rapidly cooling bodies provided on the rapidly cooling bodies 18 1 and 18 2 .
d 1 and d 2 are rapidly cooled, and the second molding surfaces a 1 ,
A mold casting method characterized by slowly cooling a 2 , b, and c.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP463087A JPS63174776A (en) | 1987-01-12 | 1987-01-12 | Mold casting method |
| CA000556226A CA1315955C (en) | 1987-01-12 | 1988-01-11 | Mold casting process and apparatus, and method for producing mechanical parts |
| DE88300217T DE3885309T2 (en) | 1987-01-12 | 1988-01-12 | Method and device for casting in a casting mold and method for producing machine parts. |
| EP88300217A EP0275177B1 (en) | 1987-01-12 | 1988-01-12 | Mold casting process and apparatus, and method for producing mechanical parts |
| US07/143,625 US4971134A (en) | 1987-01-12 | 1988-01-13 | Mold casting process and apparatus, and method for producing mechanical parts |
| US07/583,965 US5065810A (en) | 1987-01-12 | 1990-09-17 | Method of producing mechanical parts by mold casting |
| US07/769,323 US5263532A (en) | 1987-01-12 | 1991-09-30 | Mold casting process and apparatus and method for producing mechanical parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP463087A JPS63174776A (en) | 1987-01-12 | 1987-01-12 | Mold casting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63174776A JPS63174776A (en) | 1988-07-19 |
| JPH0455775B2 true JPH0455775B2 (en) | 1992-09-04 |
Family
ID=11589340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP463087A Granted JPS63174776A (en) | 1987-01-12 | 1987-01-12 | Mold casting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63174776A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106077467A (en) * | 2016-07-29 | 2016-11-09 | 无锡市三峰仪器设备有限公司 | Precoated sand mould is used in a kind of casting |
| CN116571714B (en) * | 2023-04-04 | 2023-12-22 | 江苏金卫机械设备有限公司 | Clamping device for replacing die casting die with high working efficiency |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5575874A (en) * | 1978-11-30 | 1980-06-07 | Yanmar Diesel Engine Co Ltd | Production of tough cast iron casting |
| JPS5649177A (en) * | 1979-09-28 | 1981-05-02 | Toshima Kousan Kk | Automatic mahjong table frame |
-
1987
- 1987-01-12 JP JP463087A patent/JPS63174776A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63174776A (en) | 1988-07-19 |
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