JP2012135810A - Cooling method of die and cooling device of die - Google Patents

Cooling method of die and cooling device of die Download PDF

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JP2012135810A
JP2012135810A JP2010291419A JP2010291419A JP2012135810A JP 2012135810 A JP2012135810 A JP 2012135810A JP 2010291419 A JP2010291419 A JP 2010291419A JP 2010291419 A JP2010291419 A JP 2010291419A JP 2012135810 A JP2012135810 A JP 2012135810A
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mold
water supply
supply pipe
cooling
cooling water
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JP5725850B2 (en
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Shinichiro Tanaka
進一郎 田中
Goro Funabashi
五郎 船橋
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Kubota Corp
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Kubota Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a cooling method of a die and a cooling device of the die, in which cooling of the die is performed such that surface temperature of the die becomes uniform, so that quality of a cast iron pipe can be improved in a centrifugal casting device.SOLUTION: A cooling device is provided which is constructed of: a first feed pipe 19 for spraying a coolant 22 selectively near a socket of the die 11; a second feed pipe 23 for spraying a coolant 26 over the total length of the die 11; and a third feed pipe 27 for spraying a coolant 30 selectively near a spigot of the die 11. On the basis of measurement result of the surface temperature of the die 11 after the cast iron pipe which has been cast is pulled up, by adjusting each spray quantity of the coolants 22, 26 and 30 sprayed from each of the feed pipes 19, 23 and 27 to the die 11, the cooling of the die can be performed such that the surface temperature of the die 11 becomes uniform, so that the cast pipe can be improved in quality.

Description

本発明は、遠心力鋳造装置における金型の冷却方法および金型の冷却装置に関するものである。   The present invention relates to a mold cooling method and a mold cooling apparatus in a centrifugal casting apparatus.

鋳鉄管を製造するための鋳造装置の一種として、遠心力鋳造装置がある（例えば、特許文献１）。この遠心力鋳造装置は、溶湯（溶融鋳鉄）を貯留可能な鋳込取鍋を傾動させることで、この鋳込取鍋の注ぎ口から溶湯を流出させ、この流出された溶湯を、シュートを介して、回転鋳型としての水平方向の金型の内部に流し込んで供給したうえで冷却凝固するようにしたものである。金型は、回転ローラによって水平方向に支持されるとともに軸心まわりに高速で回転されることで、遠心力の作用によって鋳鉄管を鋳造することができるように構成されている。   As a kind of casting apparatus for producing a cast iron pipe, there is a centrifugal casting apparatus (for example, Patent Document 1). This centrifugal casting device tilts the pouring ladle that can store molten metal (molten cast iron), thereby causing the molten metal to flow out from the pouring spout of the pouring ladle, and this discharged molten metal is passed through a chute. Then, after being poured into a horizontal mold as a rotary mold and supplied, it is cooled and solidified. The mold is configured so that a cast iron pipe can be cast by the action of centrifugal force by being supported in the horizontal direction by a rotating roller and rotating around the axis at high speed.

このような遠心力鋳造装置の詳細構造を図４に示す。
この遠心力鋳造装置は、図示のように、シュート５２から溶湯が注湯され、内部に鋳鉄管が鋳造される金型１１を有する。この金型１１には金属製スリーブ１２が外嵌めされている。この金属製スリーブ１２には、その全長および全周にわたって多数の貫通孔１３を有する。また金属製スリーブ１２は、その全長および全周にわたる位置において、この金属製スリーブ１２を貫通するようにねじ込まれている多数のセットボルト１４の先端により金型１１の外面を押圧することで、金型１１に対して同心状に芯出しされた状態で、金型１１との間に隙間１５が設けられて固定されている。 The detailed structure of such a centrifugal casting apparatus is shown in FIG.
As shown in the figure, this centrifugal casting apparatus has a mold 11 in which a molten metal is poured from a chute 52 and a cast iron pipe is cast inside. A metal sleeve 12 is fitted on the mold 11. The metal sleeve 12 has a large number of through holes 13 over its entire length and circumference. Further, the metal sleeve 12 is pressed against the outer surface of the mold 11 by the tips of a large number of set bolts 14 screwed so as to penetrate the metal sleeve 12 at the entire length and the entire circumference. A gap 15 is provided between the mold 11 and fixed in a state of being concentrically centered with respect to the mold 11.

金属製スリーブ１２よりも上方の位置には、金型１１の長さ方向に沿って、給水管４８が設けられている。この給水管４８は、カバー１７の外部に設けられたポンプ４９から冷却水の供給を受け、金型１１の長さ方向に沿って複数の位置に設けられた供給孔５０…５０より、下方の金属製スリーブ１２の全長にわたり均一に冷却水５１を散布できるように構成されている。この冷却水５１が、金属性スリーブ１２の貫通孔１３を通過して、隙間１５に入り込み、金型１１に到達することで、金型１１の外面を冷却できるように構成されている。   A water supply pipe 48 is provided at a position above the metal sleeve 12 along the length direction of the mold 11. This water supply pipe 48 is supplied with cooling water from a pump 49 provided outside the cover 17, and is provided below supply holes 50... 50 provided at a plurality of positions along the length direction of the mold 11. The cooling water 51 can be uniformly distributed over the entire length of the metal sleeve 12. The cooling water 51 passes through the through hole 13 of the metallic sleeve 12, enters the gap 15, and reaches the mold 11 so that the outer surface of the mold 11 can be cooled.

上記構成によれば、鋳造中あるいは鋳造後に次の鋳造を行うまでの間に、金型１１を回転させながら、金型１１の上方から給水管４８の供給孔５０…５０より金型１１の全長にわたり冷却水５１を散布して冷却することにより、簡易な構成で、溶湯の冷却凝固のほかに金型１１の外面を冷却水５１により均一に冷却でき、金型１１の温度が高くなって金型１１の曲がりが発生したり、金型１１の内面のコーティングが困難になったりすることを防止できる。   According to the above configuration, the entire length of the mold 11 is supplied from the upper side of the mold 11 through the supply holes 50... 50 of the water supply pipe 48 while rotating the mold 11 during casting or before the next casting is performed. In addition to cooling and solidifying the molten metal, the outer surface of the mold 11 can be uniformly cooled by the cooling water 51, and the temperature of the mold 11 is increased. It is possible to prevent the bending of the mold 11 and the difficulty of coating the inner surface of the mold 11.

特開平１１−１７９５１１号公報JP-A-11-179511

しかし、金型１１の内部にはシュート５２から次々に高温の溶湯が流し込まれるため、様々な原因で金型の温度分布にムラが生じる。このため、金型１１の外面に均等に冷却水を供給するだけでは、金型１１の長さ方向において、金型１１の表面温度の分布が不均一になり、その結果、溶湯の凝固速度にばらつきが生じ、湯境などの鋳造欠陥が発生して、鋳鉄管の品質が低下するおそれがあるという問題があった。   However, since high-temperature molten metal is poured from the chute 52 into the mold 11 one after another, unevenness occurs in the temperature distribution of the mold due to various causes. For this reason, if only the cooling water is supplied evenly to the outer surface of the mold 11, the distribution of the surface temperature of the mold 11 is not uniform in the length direction of the mold 11, and as a result, the solidification rate of the molten metal is increased. There has been a problem that the quality of cast iron pipes may be deteriorated due to variations and casting defects such as hot water boundaries.

また、鋳造後の鋳鉄管を金型１１から引き抜いた後、次の鋳造を行う前に金型１１の内面にコーティングを施すが、鋳鉄管の引き抜き後の金型１１の表面温度にばらつきがあると、コーティングの塗膜の厚さを均一にすることが難しくなる。コーティングの塗膜の厚さが不均一な状態で鋳造を行うと、鋳肌に鋳造欠陥が生じるため、鋳鉄管の品質が低下するおそれがあるという問題があった。   In addition, after the cast iron pipe after the casting is pulled out from the mold 11, the inner surface of the mold 11 is coated before the next casting, but the surface temperature of the mold 11 after the casting of the cast iron pipe varies. And it becomes difficult to make the thickness of the coating film uniform. When casting is performed in a state where the thickness of the coating film is not uniform, a casting defect occurs in the casting surface, and there is a problem that the quality of the cast iron pipe may be deteriorated.

本発明は、上記問題に鑑みてなされたものであり、遠心力鋳造装置において、金型の表面温度が均一となるように金型の冷却を行い、鋳造管の品質を向上できる金型の冷却方法と金型の冷却装置を提供することを目的としたものである。   The present invention has been made in view of the above problems, and in a centrifugal casting apparatus, the mold is cooled so that the surface temperature of the mold becomes uniform, and the quality of the cast pipe can be improved. It is an object to provide a method and a cooling device for a mold.

上記課題を解決するために、本発明の金型の冷却方法は、鋳鉄管を遠心力鋳造するための金型に冷却水を散布して金型の冷却を行う金型の冷却方法であって、鋳造後の鋳鉄管を金型より引き抜いた後、金型の表面温度を測定し、測定した金型の表面温度分布に基づいて、金型の長さ方向に沿った冷却水の散布量を変化させることを特徴とするものである。
なお、「冷却水の散布量を変化させる」のは、自動であっても手動であってもよい。 In order to solve the above problems, the mold cooling method of the present invention is a mold cooling method in which cooling water is sprayed on a mold for centrifugal casting of a cast iron pipe to cool the mold. After the cast iron pipe is pulled out from the mold, the surface temperature of the mold is measured. Based on the measured surface temperature distribution of the mold, the amount of cooling water sprayed along the length direction of the mold is calculated. It is characterized by changing.
“Changing the amount of cooling water sprayed” may be automatic or manual.

また、本発明の金型の冷却装置は、鋳鉄管を遠心力鋳造するための金型に冷却水を散布して金型の冷却を行う金型の冷却装置であって、金型の受け口付近に重点的に冷却水を散布する第１の給水管と、金型の全長にわたって冷却水を散布する第２の給水管と、金型の挿し口付近に重点的に冷却水を散布する第３の給水管と、金型の表面温度を測定する温度測定手段と、第１の給水管と第２の給水管と第３の給水管から金型に散布される冷却水の散布量を調節可能な調節手段とを備え、温度測定手段による金型の表面温度の測定結果に基づき、調節手段によって、第１の給水管と第２の給水管と第３の給水管から金型に散布される冷却水の散布量を変化可能としたことを特徴とするものである。   The mold cooling apparatus of the present invention is a mold cooling apparatus that cools a mold by spraying cooling water onto a mold for centrifugal casting of a cast iron pipe, in the vicinity of a mold receiving port. A first water supply pipe for spraying cooling water with a focus on the second, a second water supply pipe for spraying cooling water over the entire length of the mold, and a third for spraying the cooling water with a focus on the vicinity of the insertion opening of the mold Water supply pipe, temperature measuring means for measuring the surface temperature of the mold, the amount of cooling water sprayed from the first water supply pipe, the second water supply pipe and the third water supply pipe to the mold can be adjusted And adjusting means for spraying from the first water supply pipe, the second water supply pipe, and the third water supply pipe to the mold based on the measurement result of the mold surface temperature by the temperature measuring means. This is characterized in that the amount of cooling water sprayed can be changed.

なお、上記「重点的に冷却水を散布する」とは、金型の所定部分のみに冷却水を散布してその他の部分には冷却水の散布を全く行わない場合と、金型の所定部分に多量の冷却水を散布しながら、他の部分にも少量の冷却水を散布する場合の両方の場合を含む。   The above-mentioned “spreading the cooling water intensively” means that the cooling water is sprayed only on a predetermined part of the mold and the cooling water is not sprayed on the other parts at all, or the predetermined part of the mold. This includes both cases in which a large amount of cooling water is sprayed on and other portions are sprayed with a small amount of cooling water.

本発明の金型の冷却方法を用いれば、鋳造後の鋳鉄管を金型より引き抜いた後、金型の表面温度を測定し、測定した金型の表面温度分布に基づいて、金型の長さ方向に沿った冷却水の散布量を変化させることで、金型の長さ方向に沿った表面温度のばらつきを解消して金型の表面温度が均一となるように金型の冷却を行うことができるようになり、湯境等の鋳造欠陥が生じる可能性を低減でき、さらに、鋳造後の鋳鉄管を引き抜いた後の金型の内面のコーティングも良好に行うことができ、鋳鉄管の品質および生産性を向上することができる。   If the mold cooling method of the present invention is used, the cast iron pipe after casting is pulled out from the mold, the surface temperature of the mold is measured, and the length of the mold is determined based on the measured surface temperature distribution of the mold. By changing the spraying amount of cooling water along the vertical direction, the mold is cooled so that the surface temperature variation along the mold length direction is eliminated and the mold surface temperature becomes uniform. It is possible to reduce the possibility of casting defects such as a hot water boundary, and furthermore, the inner surface of the mold after drawing the cast iron pipe after casting can be satisfactorily performed. Quality and productivity can be improved.

本発明の金型の冷却装置を用いれば、鋳造後の鋳鉄管を金型より引き抜いた後に温度測定手段により測定された金型の表面温度に基づき、調整手段によって、金型の挿し口付近に重点的に冷却水を散布する第１の給水管と、金型の全長にわたって冷却水を散布する第２の給水管と、金型の受け口付近に重点的に冷却水を散布する第３の給水管から金型に散布される冷却水の散布量を変化可能としたことにより、金型の長さ方向に沿った表面温度のばらつきを解消して金型の表面温度が均一となるように金型の冷却を行うことができるようになり、湯境等の鋳造欠陥が生じる可能性を低減でき、さらに、鋳造後の鋳鉄管を引き抜いた後の金型の内面のコーティングも良好に行うことができ、鋳鉄管の品質および生産性を向上することができる。   If the mold cooling device of the present invention is used, based on the surface temperature of the mold measured by the temperature measuring means after the cast iron pipe after casting is pulled out from the mold, the adjusting means brings it close to the mold insertion opening. A first water supply pipe for preferentially spraying cooling water, a second water supply pipe for spraying cooling water over the entire length of the mold, and a third water supply for preferentially spraying cooling water near the mold receiving port By making it possible to change the amount of cooling water sprayed from the pipe to the mold, it is possible to eliminate variations in the surface temperature along the length of the mold so that the mold surface temperature is uniform. The mold can be cooled, the possibility of casting defects such as hot water boundaries can be reduced, and the inner surface of the mold can be satisfactorily coated after drawing the cast iron pipe after casting. It is possible to improve the quality and productivity of the cast iron pipe.

本発明の実施の一形態を示す斜視図である。It is a perspective view which shows one Embodiment of this invention. 本発明の実施の一形態を示す縦断面図である。It is a longitudinal cross-sectional view which shows one Embodiment of this invention. 図２のＸ−Ｘ断面を示す横断面図である。It is a cross-sectional view which shows the XX cross section of FIG. 従来の遠心力鋳造装置の縦断面図である。It is a longitudinal cross-sectional view of the conventional centrifugal casting apparatus.

図１〜図３において、１１は金型、１２は金属製スリーブで、これらは図４に示したものと同様の構成である。すなわち金属製スリーブ１２は、多数の貫通孔１３を有するとともに、多数のセットボルト１４によって金型１１の外周に芯出しされた状態で固定されている。
これら金型１１および金属製スリーブ１２は、水平方向を向いて配置され、長さ方向の全長にわたって、カバー１７で覆われている。 1-3, 11 is a metal mold | die, 12 is a metal sleeve, These are the structures similar to what was shown in FIG. That is, the metal sleeve 12 has a large number of through holes 13 and is fixed to the outer periphery of the mold 11 by a large number of set bolts 14.
The mold 11 and the metal sleeve 12 are arranged in the horizontal direction and are covered with a cover 17 over the entire length in the length direction.

このカバー１７の内部における金型１１および金属製スリーブ１２よりも上方には、金型１１（金属製スリーブ１２）の長さ方向に沿って、冷却水を散布して金型１１の冷却を行う冷却装置が設けられており、この冷却装置は、第１の給水管１９と、第２の給水管２３と、第３の給水管２７とを備えている。   Cooling water is sprayed along the length direction of the mold 11 (metal sleeve 12) above the mold 11 and the metal sleeve 12 inside the cover 17 to cool the mold 11. A cooling device is provided, and the cooling device includes a first water supply pipe 19, a second water supply pipe 23, and a third water supply pipe 27.

第１の給水管１９は、管体から構成され、この管体には、金型１１の受け口３３付近の上方位置に金型１１の軸心を向くように複数の供給孔２０…２０が開けられている。第１の給水管１９に冷却水を供給すると、供給孔２０…２０から金型１１の受け口３３付近に重点的に冷却水２２が散布される。   The first water supply pipe 19 is composed of a pipe body, and a plurality of supply holes 20... 20 are formed in the pipe body at an upper position near the receiving port 33 of the mold 11 so as to face the axis of the mold 11. It has been. When cooling water is supplied to the first water supply pipe 19, the cooling water 22 is preferentially sprayed from the supply holes 20... 20 to the vicinity of the receiving port 33 of the mold 11.

第２の給水管２３は、管体から構成され、この管体には、金型１１の長さ方向の全長にわたる上方位置に金型１１の軸心を向くように複数の供給孔２４…２４が開けられている。第２の給水管２３に冷却水を供給すると、供給孔２４…２４から金型１１の全長にわたって冷却水２６が散布される。   The second water supply pipe 23 is composed of a pipe body, and a plurality of supply holes 24... 24 are provided in the pipe body so as to face the axial center of the mold 11 at an upper position extending over the entire length of the mold 11. Is opened. When the cooling water is supplied to the second water supply pipe 23, the cooling water 26 is sprayed over the entire length of the mold 11 from the supply holes 24.

第３の給水管２７は、管体から構成され、この管体には、金型１１の挿し口３４付近の上方位置に金型１１の軸心を向くように複数の供給孔２８…２８が開けられている。第３の給水管２７に冷却水を供給すると、供給孔２８…２８から金型１１の挿し口３４付近に重点的に冷却水３０が散布される。   The third water supply pipe 27 is composed of a pipe body. The pipe body has a plurality of supply holes 28... 28 at an upper position near the insertion opening 34 of the mold 11 so as to face the axis of the mold 11. Opened. When the cooling water is supplied to the third water supply pipe 27, the cooling water 30 is preferentially sprayed from the supply holes 28 to 28 in the vicinity of the insertion opening 34 of the mold 11.

第１の給水管１９の供給孔２０…２０及び第３の給水管２７の供給孔２８…２８は、それぞれ、第２の給水管２３に開けられた供給孔２４…２４よりも大きな断面積とされ、冷却水の吐き出し量が多くなるようにされている。これにより、金型１１の受け口３３付近または金型１１の挿し口３４付近に冷却水を多量に散布でき、金型１１の受け口３３付近または金型１１の挿し口３４付近の重点的な冷却を行いやすくされている。   The supply holes 20... 20 of the first water supply pipe 19 and the supply holes 28... 28 of the third water supply pipe 27 each have a larger cross-sectional area than the supply holes 24 24 opened in the second water supply pipe 23. The amount of cooling water discharged is increased. As a result, a large amount of cooling water can be sprayed near the receiving port 33 of the mold 11 or the insertion port 34 of the mold 11, and intensive cooling near the receiving port 33 of the mold 11 or the insertion port 34 of the mold 11 can be performed. Easy to do.

図２，図３に示すように、これら給水管１９，２３，２７には、冷却水を供給するためのポンプ１８が接続されている。各給水管１９，２３，２７とポンプ１８の間には、第１の給水管１９のバルブ（調整手段の一例）２１と，第２の給水管２３のバルブ（調整手段の一例）２５と，第３の給水管２７のバルブ（調整手段の一例）２９が配置されている。   As shown in FIGS. 2 and 3, a pump 18 for supplying cooling water is connected to the water supply pipes 19, 23 and 27. Between each of the water supply pipes 19, 23, 27 and the pump 18, a valve (an example of the adjusting means) 21 of the first water supply pipe 19, a valve (an example of the adjusting means) 25 of the second water supply pipe 23, A valve (an example of an adjusting unit) 29 of the third water supply pipe 27 is disposed.

これらのバルブ２１，２５，２９の開度を調節することにより、ポンプ１８から各給水管１９，２３，２７に供給される冷却水の供給量を、それぞれ調節できるように構成されており、金型１１の受け口３３付近に散布される冷却水２２の散布量と、金型１１の全長にわたって散布される冷却水２６の散布量と、金型１１の挿し口３４付近に散布される冷却水３０の散布量を、それぞれ調節することができる。   By adjusting the opening degree of these valves 21, 25, 29, the supply amount of the cooling water supplied from the pump 18 to each of the water supply pipes 19, 23, 27 can be adjusted respectively. The amount of cooling water 22 sprayed near the receiving port 33 of the mold 11, the amount of cooling water 26 sprayed over the entire length of the mold 11, and the cooling water 30 sprayed near the insertion port 34 of the mold 11. Can be adjusted individually.

カバー１７内における金属製スリーブ１２よりも下方には、この金属製スリーブ１２から流れ落ちた排水３５を受け止める水受け部３６が設けられている。３７はカバー１７の外部に続く排水管で、水受け部３６に連通され、バルブ３８を介して、排水３５を外部へ送り出し可能とされている。   A water receiving portion 36 is provided below the metal sleeve 12 in the cover 17 to receive the drainage 35 that has flowed down from the metal sleeve 12. A drain pipe 37 is connected to the outside of the cover 17 and communicates with the water receiving portion 36 so that the drainage 35 can be sent to the outside through a valve 38.

また、図中の３１、３２は、散水された冷却水２２，２６，３０が金型１１の両端面方向へ飛散するのを防止して、金型１１内に水が入り込むのを防止するための止水カバーであり、必要に応じて設けられる。
上記構成による金型の冷却方法を説明する。 Reference numerals 31 and 32 in the figure prevent the sprayed cooling waters 22, 26, and 30 from splashing in the direction of the both end surfaces of the mold 11 to prevent water from entering the mold 11. This is a waterproof cover and is provided as necessary.
A method of cooling the mold having the above configuration will be described.

まず、金型１１から鋳造後の鋳鉄管を引き抜いた直後、金型１１の内面温度を測定する。金型１１の内面温度を測定する箇所・測定する箇所の数は任意に設定できるが、図２に示すように、例えば、金型１１の内面における、受け口付近の部分Ａ，中央部付近の部分Ｂ，挿し口付近の部分Ｃの３箇所を測定するようにすれば、長さ方向における金型１１の内面温度のおおまかな分布を測定できる。このような金型１１の内面の各部分Ａ〜Ｃの温度は、放射温度計（温度測定手段の一例）等により測定する。   First, immediately after drawing the cast iron pipe after casting from the mold 11, the inner surface temperature of the mold 11 is measured. The number of locations for measuring the temperature of the inner surface of the mold 11 and the number of locations to be measured can be arbitrarily set. However, as shown in FIG. 2, for example, the portion A near the receiving port and the portion near the center on the inner surface of the mold 11 B, if the three portions C in the vicinity of the insertion opening are measured, the rough distribution of the inner surface temperature of the mold 11 in the length direction can be measured. The temperature of each portion A to C on the inner surface of the mold 11 is measured by a radiation thermometer (an example of temperature measuring means).

そして、金型１１を溶湯の熱から保護するために金型１１の内面にコーティングを施してから、金型１１の内面温度の測定結果に基づいて、各給水管１９，２３，２７のバルブ２１，２５，２９の開度が調節される。これらバルブ２１，２５，２９の開度の調節は、自動で行っても手動で行ってもよい。   And in order to protect the metal mold | die 11 from the heat | fever of a molten metal, after coating the inner surface of the metal mold | die 11, based on the measurement result of the internal surface temperature of the metal mold | die 11, the valve | bulb 21 of each water supply pipe | tube 19,23,27. , 25, 29 are adjusted. Adjustment of the opening degree of these valves 21, 25, 29 may be performed automatically or manually.

バルブ２１，２５，２９の開度を調節する際には、金型１１の内面温度が高温の部分がある場合、その部分に対応する給水管のバルブ２１，２５，２９の開度を大きくして、高温の部分に散布される冷却水の散布量を増やすようにし、逆に、金型１１の内面温度が低温の部分がある場合、その部分に対応する給水管のバルブ２１，２５，２９の開度を小さくして、低温の部分に散布される冷却水の散布量を減らすようにする。
図２に図示した例では、測定した各部分Ａ，Ｂ，Ｃの温度に対応して、以下のようにバルブ２１，２５，２９の開度を調節する。 When adjusting the opening degree of the valves 21, 25, 29, if there is a part where the inner surface temperature of the mold 11 is high, the opening degree of the valves 21, 25, 29 of the water supply pipe corresponding to that part is increased. Thus, when the amount of cooling water sprayed on the high temperature portion is increased, and on the contrary, when there is a portion where the inner surface temperature of the mold 11 is low, the valves 21, 25, 29 of the water supply pipe corresponding to that portion The amount of cooling water sprayed on the low temperature part is reduced by reducing the opening degree of.
In the example illustrated in FIG. 2, the opening degree of the valves 21, 25, 29 is adjusted as follows in accordance with the measured temperatures of the respective portions A, B, C.

部分Ａの測定結果が高温の場合は、第１の給水管１９のバルブ２１の開度を大きくして、金型１１の受け口３３付近に散布される冷却水２２の散布量を多くする。逆に、部分Ａの測定結果が低温の場合は、第１の給水管１９のバルブ２１の開度を小さくして、金型１１の受け口３３付近に散布される冷却水２２の散布量を少なくする。   When the measurement result of the part A is high, the opening degree of the valve 21 of the first water supply pipe 19 is increased, and the spraying amount of the cooling water 22 sprayed near the receiving port 33 of the mold 11 is increased. On the contrary, when the measurement result of the portion A is low temperature, the opening degree of the valve 21 of the first water supply pipe 19 is decreased, and the spraying amount of the cooling water 22 sprayed near the receiving port 33 of the mold 11 is decreased. To do.

部分Ｂの測定結果が高温の場合は、第２の給水管２３のバルブ２５の開度を大きくして、金型１１の全長にわたって散布される冷却水２６の散布量を多くし、さらに、第１の給水管１９のバルブ２１および第３の給水管２７のバルブ２９の開度をそれぞれ小さくして、受け口３３付近および挿し口３４付近に散布される冷却水１８，２６の散布量を少なくする。逆に、部分Ｂの測定結果が低温の場合は、第２の給水管２３のバルブ２５の開度を小さくして、金型１１の全長にわたって散布される冷却水２６の散布量を少なくし、さらに、第１の給水管１９のバルブ２１および第３の給水管２７のバルブ２９の開度をそれぞれ大きくして、受け口３３付近および挿し口３４付近に散布される冷却水１８，２６の散布量を多くする。   When the measurement result of the portion B is high, the opening of the valve 25 of the second water supply pipe 23 is increased, the amount of the cooling water 26 sprayed over the entire length of the mold 11 is increased, and the second The opening amounts of the valve 21 of the first water supply pipe 19 and the valve 29 of the third water supply pipe 27 are reduced, respectively, to reduce the spraying amount of the cooling water 18 and 26 sprayed near the receiving port 33 and the insertion port 34. . On the contrary, when the measurement result of the part B is low, the opening of the valve 25 of the second water supply pipe 23 is decreased, and the spraying amount of the cooling water 26 sprayed over the entire length of the mold 11 is reduced. Further, the opening amounts of the valve 21 of the first water supply pipe 19 and the valve 29 of the third water supply pipe 27 are increased, respectively, and the spraying amounts of the cooling waters 18 and 26 sprayed in the vicinity of the receiving port 33 and the insertion port 34. To increase.

部分Ｃの測定結果が高温の場合は、第３の給水管２７のバルブ２９の開度を大きくして、金型１１の挿し口３４付近に散布される冷却水３０の散布量を多くし、逆に、部分Ｃの測定結果が低温の場合は、第３の給水管２７のバルブ２９の開度を小さくして、金型１１の挿し口３４付近に散布される冷却水３０の散布量を少なくする。   When the measurement result of the part C is high, the opening degree of the valve 29 of the third water supply pipe 27 is increased, and the spraying amount of the cooling water 30 sprayed near the insertion port 34 of the mold 11 is increased. On the contrary, when the measurement result of the part C is low, the opening amount of the valve 29 of the third water supply pipe 27 is made small, and the spraying amount of the cooling water 30 sprayed near the insertion port 34 of the mold 11 is set. Reduce.

このようにして、測定した内面温度に基づいてバルブ２１，２５，２９の開度が調節された各給水管１９，２３，２７により、下方の金属製スリーブ１２および金型１１に向けて冷却水２２，２６，３０の散布が開始される。そして、各給水管１９，２３，２７から冷却水２２，２６，３０を散布しつつ、金型１１と金属製スリーブ１２とを一体としてローラ１６，１６により高速回転させる。そして、十分な回転数となれば、図２，図３に仮想線で示すように、シュート５２より溶湯を金型１１内に注湯する。   In this way, the cooling water is directed toward the lower metal sleeve 12 and the mold 11 by the respective water supply pipes 19, 23, 27 in which the opening degree of the valves 21, 25, 29 is adjusted based on the measured inner surface temperature. Scattering of 22, 26 and 30 is started. The mold 11 and the metal sleeve 12 are integrally rotated at high speed by the rollers 16 and 16 while spraying the cooling water 22, 26 and 30 from the respective water supply pipes 19, 23 and 27. And if it becomes sufficient rotation speed, as shown with a virtual line in FIG.2, FIG.3, molten metal is poured in the metal mold | die 11 from the chute | shoot 52. FIG.

従って、鋳造後の鋳鉄管を引き抜いた直後の金型１１の内面温度の測定結果に基づいて、各給水管１９，２３，２７から金型１１に散布される冷却水２２，２６，３０の散布量が調節されているため、金型１１の長さ方向において、金型１１の内面温度のばらつきが解消され金型１１の内面温度が均一になるように冷却することができ、金型１１の内部における、溶湯を凝固させるための条件が均一化されるため、湯境等の鋳造欠陥が生じる可能性を低減でき、鋳鉄管の品質および生産性を向上することができる。   Therefore, based on the measurement result of the inner surface temperature of the mold 11 immediately after drawing the cast iron pipe after casting, the spraying of the cooling water 22, 26, 30 sprayed from the respective water supply pipes 19, 23, 27 to the mold 11 is performed. Since the amount is adjusted, in the length direction of the mold 11, the variation in the inner surface temperature of the mold 11 can be eliminated and the inner surface temperature of the mold 11 can be made uniform. Since the conditions for solidifying the molten metal inside are made uniform, the possibility of casting defects such as a molten metal boundary can be reduced, and the quality and productivity of the cast iron pipe can be improved.

また、上記の作業により鋳造した鋳鉄管を金型１１より引き抜いた後、金型１０の内面温度を再び測定してから、次の鋳造を行うために金型１１の内面にコーティングを施す際、各給水管１９，２３，２７から散布される冷却水２２，２６，３０の散布量を調節していたため、金型１１の長さ方向に沿った内面温度のばらつきが解消され金型１１の内面温度が均一化されている。このため、金型１１の内面に施されるコーティングの塗膜の厚さを均一にすることができ、鋳造後の鋳鉄管を引き抜いた後の金型１１の内面のコーティングを良好に行うことができる。よって、コーティング不良に起因する鋳造欠陥の発生を防止でき、鋳鉄管の品質および生産性を向上することができる。
なお、本発明は、上記実施の形態以外にも種々の実施の形態が考えられる。 Further, after the cast iron pipe cast by the above operation is pulled out from the mold 11, after measuring the inner surface temperature of the mold 10 again, when coating the inner surface of the mold 11 for the next casting, Since the spraying amount of the cooling water 22, 26, 30 sprayed from each of the water supply pipes 19, 23, 27 was adjusted, variation in the inner surface temperature along the length direction of the mold 11 was eliminated, and the inner surface of the mold 11. The temperature is uniform. For this reason, the thickness of the coating film applied to the inner surface of the mold 11 can be made uniform, and the inner surface of the mold 11 can be satisfactorily coated after the cast iron pipe after the casting is drawn out. it can. Therefore, it is possible to prevent the occurrence of casting defects due to defective coating and improve the quality and productivity of cast iron pipes.
In addition to the above-described embodiments, various embodiments can be considered for the present invention.

本発明では、金型１１の温度の均一化を図るため、長さ方向において金型１１の内面の複数箇所について、温度の測定を行うことが重要である。上記実施の形態では、金型１１の内面の温度分布を測定しており、この際に、金型１１の内面の各部分Ａ〜Ｃを測定していたが、金型１１の内面温度の測定箇所は更に増やしてもよい。金型１１の内面温度の測定箇所を増やすことにより、金型１１の内面温度の分布をより詳細に測定できる。   In the present invention, in order to make the temperature of the mold 11 uniform, it is important to measure the temperature at a plurality of locations on the inner surface of the mold 11 in the length direction. In the above embodiment, the temperature distribution of the inner surface of the mold 11 is measured, and at this time, each portion A to C of the inner surface of the mold 11 is measured. The number of points may be further increased. By increasing the number of measurement points of the inner surface temperature of the mold 11, the distribution of the inner surface temperature of the mold 11 can be measured in more detail.

また本発明では、金型１１の各部分に対して重点的な冷却を行うことが重要である。上記実施の形態では、金型１１の受け口３３付近の上方位置の部分に供給孔２０…２０が開けられた第１の給水管１９と、金型１１の長さ方向の全長にわたる上方位置に供給孔２４…２４が開けられた第２の給水管２３と、金型１１の挿し口３４付近の上方位置の部分に供給孔２８…２８が開けられた第３の給水管２７を用いていたが、これに限ることはない。すなわち、第１の給水管１９と第３の給水管２７に、第２の給水管２３の様に金型１１の長さ方向の全長にわたる上方位置に供給孔を設け、第１の給水管１９は、金型１１の受け口３３付近の上方位置の供給孔の断面積を他の供給孔の断面積より大きくし、第３の給水管２７は、金型１１の挿し口３４付近の上方位置の供給孔の断面積を他の供給孔の断面積より大きくするようにしてもよい。これにより、第１の給水管１９からは、金型１１の受け口３３付近に多量の冷却水を散布しながら、他の部分にも少量の冷却水が散布される。また第３の給水管２７からは、金型１１の挿し口３４付近に多量の冷却水を散布しながら、他の部分にも少量の冷却水が散布される。   In the present invention, it is important to perform intensive cooling on each part of the mold 11. In the above embodiment, the first water supply pipe 19 in which the supply holes 20... 20 are opened in the upper position near the receiving port 33 of the mold 11 and the upper position over the entire length of the mold 11 are supplied. The second water supply pipe 23 in which the holes 24... 24 are formed and the third water supply pipe 27 in which the supply holes 28... 28 are formed in the upper position near the insertion opening 34 of the mold 11 are used. This is not a limitation. That is, the first water supply pipe 19 and the third water supply pipe 27 are provided with a supply hole at an upper position over the entire length in the length direction of the mold 11 like the second water supply pipe 23. The cross-sectional area of the upper supply hole near the receiving port 33 of the mold 11 is made larger than the cross-sectional area of the other supply holes, and the third water supply pipe 27 is located at the upper position near the insertion port 34 of the mold 11. You may make it make the cross-sectional area of a supply hole larger than the cross-sectional area of another supply hole. Thereby, a small amount of cooling water is sprayed from the first water supply pipe 19 to other portions while spraying a large amount of cooling water near the receiving port 33 of the mold 11. Further, from the third water supply pipe 27, a small amount of cooling water is sprayed to other portions while a large amount of cooling water is sprayed near the insertion port 34 of the mold 11.

また本発明では、金型１１に対する各給水管からの冷却水の散布量を調節することが重要である。上記実施の形態では、金型１１に対する冷却水の散布量の調節は、各給水管１９，２３，２７のバルブ２１，２５，２９の開度を調節することにより行っていたが、これらバルブ２１，２５，２９のオン／オフを切り換えることにより、冷却水の散布を行う給水管と冷却水の散布を行わない給水管を選択的に切り換えて、冷却水の散布量の調節を行うようにしてもよい。   In the present invention, it is important to adjust the amount of cooling water sprayed from each water supply pipe to the mold 11. In the above embodiment, the amount of cooling water sprayed onto the mold 11 is adjusted by adjusting the opening of the valves 21, 25, 29 of the water supply pipes 19, 23, 27. , 25, 29 are switched on and off to selectively switch between a water supply pipe for spraying the cooling water and a water supply pipe for which the cooling water is not sprayed to adjust the spraying quantity of the cooling water. Also good.

また本発明では、給水管から金型１１へ冷却水が散布されることが重要である。上記実施の形態では、金型１１の上方に各給水管１９，２３，２７を配置していたが、金型１１の側方や下方に給水管を配置するようにしてもよい。この場合、給水管の供給孔は、金型１１の軸心に向くように開けられている。   In the present invention, it is important that the cooling water is sprayed from the water supply pipe to the mold 11. In the above embodiment, the water supply pipes 19, 23, 27 are arranged above the mold 11. However, the water supply pipes may be arranged on the side of the mold 11 or below the mold 11. In this case, the supply hole of the water supply pipe is opened to face the axis of the mold 11.

また本発明では、金型１１の表面温度を測定する温度測定手段を備えることが重要である。なお、上記実施の形態では、放射温度計により金型の内面温度を測定していたが、放射温度計により金属製スリーブ１２に開けられた複数の貫通孔１３から金型１１の外面温度を測定することにより、金型１１の長さ方向の温度分布を測定するようにしてもよい。また上記実施の形態では、金型１１の表面温度を測定する手段として、放射温度計を用いたが、赤外線カメラ等の撮像手段を用いて金型１１の表面を撮像し、撮像した画像を解析することにより金型１１の表面温度を測定するようにしてもよい。   In the present invention, it is important to provide a temperature measuring means for measuring the surface temperature of the mold 11. In the above embodiment, the inner surface temperature of the mold is measured by the radiation thermometer. However, the outer surface temperature of the mold 11 is measured from the plurality of through holes 13 opened in the metal sleeve 12 by the radiation thermometer. By doing so, the temperature distribution in the length direction of the mold 11 may be measured. Moreover, in the said embodiment, although the radiation thermometer was used as a means to measure the surface temperature of the metal mold | die 11, the surface of the metal mold | die 11 is imaged using imaging means, such as an infrared camera, and the imaged image is analyzed. By doing so, the surface temperature of the mold 11 may be measured.

本発明は、特に、小口径のダクタイル鉄管（特にφ５０のような製品）の製造に適し、このような鉄管の品質および生産性の向上を図ることができる。   The present invention is particularly suitable for the manufacture of small-diameter ductile iron pipes (particularly products such as φ50), and can improve the quality and productivity of such iron pipes.

１１ 金型
１９ 第１の給水管
２３ 第２の給水管
２７ 第３の給水管
３３ 受け口
３４ 挿し口 11 Mold 19 First Water Supply Pipe 23 Second Water Supply Pipe 27 Third Water Supply Pipe 33 Receiving Port 34 Insertion Port

Claims (2)

鋳鉄管を遠心力鋳造するための金型に冷却水を散布して金型の冷却を行う金型の冷却方法であって、
鋳造後の鋳鉄管を金型より引き抜いた後、金型の表面温度を測定し、測定した金型の表面温度分布に基づいて、金型の長さ方向に沿った冷却水の散布量を変化させること
を特徴とする金型の冷却方法。 A mold cooling method for cooling a mold by spraying cooling water on a mold for centrifugal casting of a cast iron pipe,
After the cast iron pipe is pulled out from the mold, the surface temperature of the mold is measured, and the amount of cooling water sprayed along the length of the mold is changed based on the measured surface temperature distribution of the mold. A method for cooling a mold, characterized in that: 鋳鉄管を遠心力鋳造するための金型に冷却水を散布して金型の冷却を行う金型の冷却装置であって、
金型の受け口付近に重点的に冷却水を散布する第１の給水管と、
金型の全長にわたって冷却水を散布する第２の給水管と、
金型の挿し口付近に重点的に冷却水を散布する第３の給水管と、
金型の表面温度を測定する温度測定手段と、
第１の給水管と第２の給水管と第３の給水管から金型に散布される冷却水の散布量を調節可能な調節手段とを備え、
温度測定手段による金型の表面温度の測定結果に基づき、調節手段によって、第１の給水管と第２の給水管と第３の給水管から金型に散布される冷却水の散布量を変化可能としたこと
を特徴とする金型の冷却装置。 A mold cooling device for cooling a mold by spraying cooling water on a mold for centrifugal casting of a cast iron pipe,
A first water supply pipe that disperses cooling water mainly in the vicinity of the mold receiving port;
A second water supply pipe for spraying cooling water over the entire length of the mold;
A third water supply pipe that disperses cooling water mainly in the vicinity of the insertion hole of the mold;
Temperature measuring means for measuring the surface temperature of the mold,
Adjusting means capable of adjusting the amount of cooling water sprayed from the first water supply pipe, the second water supply pipe and the third water supply pipe to the mold;
Based on the measurement result of the surface temperature of the mold by the temperature measuring means, the amount of cooling water sprayed from the first water supply pipe, the second water supply pipe and the third water supply pipe to the mold is changed by the adjusting means. A mold cooling device characterized by being made possible.
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CN104338915A (en) * 2014-10-16 2015-02-11 黄石新兴管业有限公司 Water cooling device for barrel of centrifugal ductile cast iron pipe centrifuge
CN106735044A (en) * 2017-03-02 2017-05-31 新兴铸管股份有限公司 A kind of horizontal centrifuge pipe die cooling device
CN110039023A (en) * 2019-05-20 2019-07-23 新兴铸管股份有限公司 Bellmouth device for ductile iron pipe production
CN115464112A (en) * 2022-09-16 2022-12-13 哈尔滨工业大学 Ultra-large cylinder sleeve accurate water-cooling temperature-control centrifugal casting device and casting method

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CN110039024B (en) * 2019-05-07 2020-12-22 新兴铸管股份有限公司 Temperature measuring method, temperature control method and system for pipe die of centrifugal nodular cast iron pipe by hot die method

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Publication number Priority date Publication date Assignee Title
CN104338915A (en) * 2014-10-16 2015-02-11 黄石新兴管业有限公司 Water cooling device for barrel of centrifugal ductile cast iron pipe centrifuge
CN104338915B (en) * 2014-10-16 2016-06-01 黄石新兴管业有限公司 A kind of ductile centrifugal cast iron pipe centrifuge machine cylinder water-chilling plant
CN106735044A (en) * 2017-03-02 2017-05-31 新兴铸管股份有限公司 A kind of horizontal centrifuge pipe die cooling device
CN110039023A (en) * 2019-05-20 2019-07-23 新兴铸管股份有限公司 Bellmouth device for ductile iron pipe production
CN115464112A (en) * 2022-09-16 2022-12-13 哈尔滨工业大学 Ultra-large cylinder sleeve accurate water-cooling temperature-control centrifugal casting device and casting method

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