JP2013018029A - Centrifugal casting mold - Google Patents
Centrifugal casting mold Download PDFInfo
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- JP2013018029A JP2013018029A JP2011153469A JP2011153469A JP2013018029A JP 2013018029 A JP2013018029 A JP 2013018029A JP 2011153469 A JP2011153469 A JP 2011153469A JP 2011153469 A JP2011153469 A JP 2011153469A JP 2013018029 A JP2013018029 A JP 2013018029A
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Abstract
Description
本発明は、鋳造した管の直部の外径寸法を一定にすることが可能な遠心力鋳造用モールドに関するものである。 The present invention relates to a centrifugal casting mold capable of making the outer diameter of a straight portion of a cast pipe constant.
従来から、管の製造方法として、鋳造が広く用いられており、その一例として、図５に示す設備を使った遠心力鋳造法があげられる。 2. Description of the Related Art Conventionally, casting has been widely used as a method for manufacturing a pipe, and an example thereof is a centrifugal casting method using equipment shown in FIG.
１は円筒形の金型で遠心力鋳造用モールドと呼ばれ、２はモールドを軸周りに回転可能に支持する回転ローラーである。３のトラフはモールド１の内面に溶鉄８を注ぎ込むための樋で、４は溶鉄を容れて運ぶ取鍋である。 Reference numeral 1 denotes a cylindrical mold called a centrifugal casting mold, and reference numeral 2 denotes a rotating roller that supports the mold so as to be rotatable around an axis. 3 is a trough for pouring the molten iron 8 into the inner surface of the mold 1, and 4 is a ladle that holds the molten iron.
モールド１の外面には、外側に突出して軸周りに一周する帯状のタイヤ部５，５’が設けられ、モールド１を回転させる時にその外周面がローラー２と接触する。
また、モールド１は、軸方向に分割して付け外しが出来るように、外向きの円形フランジを同心で突き合わせた接合部７も備えている。
The outer surface of the mold 1 is provided with strip-shaped tire portions 5 and 5 ′ that protrude outward and go around the axis, and the outer peripheral surface of the mold 1 contacts the roller 2 when the mold 1 is rotated.
The mold 1 also includes a joint 7 in which an outward circular flange is concentrically abutted so that it can be attached and detached in the axial direction.
鋳造方法は、ローラー２を回して筒状の遠心力鋳造用モールド１を軸心周りに高速で回転させた状態で、モールド内に溶鉄８を流し込み、溶鉄が冷えて固まって鋳造管９が出来てからモールドの回転を止め、蓋板１０を外してモールドの中から鋳造管９を引き抜いて取り出すものである。
鋳造管９は、主に、外径が均一な円筒形状を成す直部と、直部に比べて外径が大きく膨らんだ受口部とで構成されている。
The casting method is as follows. In the state where the roller 2 is rotated and the cylindrical centrifugal casting mold 1 is rotated around the axis at a high speed, the molten iron 8 is poured into the mold, and the molten iron is cooled and solidified to form a casting tube 9. Thereafter, the rotation of the mold is stopped, the cover plate 10 is removed, and the casting tube 9 is pulled out from the mold.
The cast pipe 9 is mainly composed of a straight part having a cylindrical shape with a uniform outer diameter and a receiving part having a larger outer diameter than the straight part.
図の中で、Ｓは、モールドの一部として、鋳造管９の直部を形成するための鋳型となる部分（以下、直部形成部分という）を指し、Ｊは、鋳造管９の受口部を形成するための鋳型となる部分（以下、受口形成部分という）を指している。
なお、鋳造管９の直部の外径寸法を一定にするために、モールド１の直部形成部分Ｓの内径寸法は一定になっている。
In the figure, S indicates a portion (hereinafter referred to as a straight portion forming portion) that becomes a mold for forming a straight portion of the cast tube 9 as a part of the mold, and J indicates a receiving port of the cast tube 9. The part used as the casting_mold | template for forming a part (henceforth a receptacle formation part) is pointed out.
In addition, in order to make the outer diameter dimension of the straight part of the casting tube 9 constant, the inner diameter dimension of the straight part forming part S of the mold 1 is constant.
このような遠心力鋳造用モールド、すなわち外面の一部に肉厚なタイヤ部を備えた円筒形金型は、既に開示されている（例えば、特許文献１の第１図参照）。 Such a centrifugal casting mold, that is, a cylindrical mold having a thick tire portion on a part of the outer surface has already been disclosed (for example, refer to FIG. 1 of Patent Document 1).
ところで、図５に示すように、直部形成部分Ｓの外面にタイヤ部や接合部（以下、合わせて突出部という）を設けて遠心力鋳造を行う場合、突出部は、Ｓの他の部分よりも肉厚になるため、鋳造時の熱膨張量など溶鉄から与えられる熱の影響が他の部分とは異なる。また、熱容量も異なるため、肉厚な突出部においては、溶鉄の冷却速度がＳの他の部分と比べて遅くなる。 By the way, as shown in FIG. 5, when providing a tire part and a junction part (henceforth a protrusion part collectively) on the outer surface of the straight part formation part S and performing centrifugal casting, a protrusion part is another part of S. Therefore, the influence of the heat applied from the molten iron, such as the amount of thermal expansion during casting, differs from the other parts. In addition, since the heat capacities are different, the cooling rate of the molten iron is slower than the other portions of S in the thick protrusions.
このように、モールドの厚みが異なると熱膨張量や溶鉄の冷却速度も異なるため、図５に示すような直部形成部分Ｓの内径寸法が一定な遠心力鋳造用モールドを使用して鋳造した場合、鋳造管の直部の外径寸法のうち、肉厚な突出部の内面で形成された部分の外径寸法が他の直部の外径寸法に比べて小さくなる傾向がある。
遠心力鋳造法では、鋳造管の内径が均一に出来上がるため、外径が小さい部分は、管の厚みが薄くなる。
Thus, since the amount of thermal expansion and the cooling rate of molten iron differ depending on the thickness of the mold, casting is performed using a centrifugal casting mold in which the inner diameter dimension of the straight portion forming portion S as shown in FIG. 5 is constant. In this case, among the outer diameter dimensions of the straight portion of the cast pipe, the outer diameter size of the portion formed by the inner surface of the thick protruding portion tends to be smaller than the outer diameter dimensions of the other straight portions.
In the centrifugal casting method, the inner diameter of the cast pipe is made uniform, so that the thickness of the pipe is reduced at the portion where the outer diameter is small.
本発明は、鋳造管の直部の外径がモールドの突出部の影響で部分的に小さくなるのを防ぐことを課題とする。 This invention makes it a subject to prevent that the outer diameter of the direct part of a cast pipe becomes partially small under the influence of the protrusion part of a mold.
上記課題を解決するために、本発明の遠心力鋳造用モールドは、円筒形金型の外面に突出部を備えた遠心力鋳造用モールドであって、前記突出部が円筒形金型の外面で軸周りに一周する突条であり、このモールドで鋳造する管の直部を形成するための鋳型となる直部形成部分の外面に前記突出部を設け、突出部以外の直部形成部分の内径寸法が一定であり、その内径寸法よりも突出部の内径寸法が大きいものとした。
これにより、突出部が肉厚で、熱膨張量や溶鉄の冷却速度が異なっても、鋳造した管の直部の外径寸法のうち、突出部に対応する部分の外径寸法が小さくならない。
In order to solve the above-mentioned problems, the centrifugal casting mold of the present invention is a centrifugal casting mold provided with a protruding portion on the outer surface of a cylindrical mold, and the protruding portion is an outer surface of the cylindrical mold. It is a ridge that goes around the axis, and the protrusion is provided on the outer surface of the straight part forming part that forms the straight part of the pipe cast by this mold, and the inner diameter of the straight part forming part other than the protruding part The dimensions were constant, and the inner diameter dimension of the protrusion was larger than the inner diameter dimension.
Thereby, even if the protruding portion is thick and the amount of thermal expansion and the cooling rate of the molten iron are different, the outer diameter size of the portion corresponding to the protruding portion of the outer diameter size of the straight portion of the cast pipe is not reduced.
本発明の遠心力鋳造用モールドは、鋳造管の直部の外径寸法が、モールドの突出部（タイヤ部や接合部）の影響を受けて部分的に小さくなるのを防ぐことができる。 The centrifugal casting mold of the present invention can prevent the outer diameter of the direct portion of the casting tube from being partially reduced due to the influence of the protruding portion (tire portion or joint portion) of the mold.
以下、本発明の実施形態について、図１〜３を使って説明する。なお、遠心力鋳造設備の構成など、既述の背景技術と共通するものについては同じ符号を付して重複する説明は省略する。 Hereinafter, embodiments of the present invention will be described with reference to FIGS. In addition, about the thing which is common in the background art mentioned above, such as a structure of a centrifugal casting equipment, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.
図１は、本発明に係る遠心力鋳造用モールドを使用した鋳造設備の概略を示す側面図である。
このように、遠心力鋳造設備は、既述のものと同様に、主に、モールド１’と回転ローラー２、トラフ３、取鍋４から構成されている。
FIG. 1 is a side view showing an outline of a casting facility using a centrifugal casting mold according to the present invention.
As described above, the centrifugal casting equipment mainly includes the mold 1 ′, the rotating roller 2, the trough 3, and the ladle 4 as described above.
１’は、円筒形の鋼製金型であり、遠心力鋳造用モールドと呼ばれる。このモールドは、軸周りにバランス良く回転する回転体となっており、鋳造した管の受口部分を形成する受口形成部分Ｊと、管の直部を形成する直部形成部分Ｓを備えている。 Reference numeral 1 'denotes a cylindrical steel mold, which is called a centrifugal casting mold. This mold is a rotating body that rotates in a well-balanced manner around an axis, and includes a receiving port forming portion J that forms a receiving port portion of a cast tube and a straight portion forming portion S that forms a straight portion of the tube. Yes.
モールドの外面には、接合部７と二つのタイヤ部５，５’が外向きに突出している。タイヤ部５，５’は、モールドと同心で一周する一定幅の円形突条であり、回転ローラー２と接触する外周面は周方向に滑らかに仕上げられている。 On the outer surface of the mold, a joint portion 7 and two tire portions 5 and 5 ′ protrude outward. The tire portions 5 and 5 ′ are circular ridges having a constant width and concentric with the mold, and the outer peripheral surface in contact with the rotating roller 2 is smoothly finished in the circumferential direction.
接合部７は、モールドと同心で一周する一定幅の外向き円形フランジを突き合わせて接合した部分であり、モールドを軸方向に分割したり接合するために設けられている。 The joint portion 7 is a portion where an outward circular flange having a constant width concentric with the mold and abutted against each other is joined and joined, and is provided for dividing or joining the mold in the axial direction.
また、モールドの受口形成部分Ｊ側の端部内には、円盤状の蓋板１０が嵌めて取り付けられ、中に注いだ溶鉄８が外に流出することを防いでいる。
モールドの内面には耐火材１１が薄く均一な厚みでコーティングされている。
Further, a disc-shaped cover plate 10 is fitted and attached in the end portion of the mold on the receiving port forming portion J side to prevent the molten iron 8 poured therein from flowing out.
The inner surface of the mold is coated with a thin and uniform refractory material 11.
直部形成部分Ｓの内径寸法は、タイヤ部５，５’の内面と接合部７の内面となる部分を除き、一定になっており、タイヤ部５，５’の内面と接合部７の内面となる部分だけ、大きくなっている。具体的には、図１に示すように、直部形成部分Ｓの内面のうち、タイヤ部５，５’と接合部７の内面部分に、幅が広くて浅い溝がモールド内面を軸周りに一周するようにそれぞれ設けられている。
直部形成部分Ｓの金型の厚みは、タイヤ部５，５’と接合部７を除くと、ほぼ均一になっている。タイヤ部と接合部は、内面に溝を設けて内径を大きくしているが、その溝の段差ｈよりも外面で突出する寸法ｔ１，ｔ２の方が大きいため、他の直部と比べて肉厚となっている。
The inner diameter dimension of the straight portion forming portion S is constant except for the inner surface of the tire portions 5, 5 ′ and the inner surface of the joint portion 7, and the inner surface of the tire portions 5, 5 ′ and the inner surface of the joint portion 7. Only the part that becomes is larger. Specifically, as shown in FIG. 1, of the inner surface of the straight portion forming portion S, a wide and shallow groove is formed around the inner surface of the mold around the inner surface portion of the tire portions 5, 5 ′ and the joint portion 7. Each is provided so as to make a round.
The thickness of the mold of the straight portion forming portion S is substantially uniform except for the tire portions 5 and 5 ′ and the joint portion 7. The tire part and the joint part are provided with grooves on the inner surface to increase the inner diameter, but the dimensions t1 and t2 projecting on the outer surface are larger than the step h of the groove. It is thick.
回転ローラー２は、片側の端部に外向きの鍔を付けた幅広の円柱体であり、図１と２から分かるように、この遠心力鋳造設備には計４基設けられており、各ローラーの軸心はお互いに平行または一致し、４基で一本のモールドを支持する構造となっている。
４基のローラーうち、少なくとも１基は電動機の動力を伝える駆動軸が接続された駆動ローラーとなっており、残りのローラーは従動ローラーとなっている。
図２に示すように回転ローラー２の外周面がタイヤ部の外周面と接触していて、駆動ローラーが高速回転することで、鋳造時にモールドが軸心周りに高速で回転する。
The rotating roller 2 is a wide cylindrical body with an outward flange on one end, and as can be seen from FIGS. 1 and 2, a total of four units are provided in this centrifugal casting equipment. These axes are parallel to or coincide with each other, and are configured to support one mold with four units.
Of the four rollers, at least one is a drive roller to which a drive shaft that transmits the power of the electric motor is connected, and the remaining rollers are driven rollers.
As shown in FIG. 2, the outer peripheral surface of the rotating roller 2 is in contact with the outer peripheral surface of the tire portion, and the drive roller rotates at high speed, so that the mold rotates at high speed around the axis during casting.
図３は遠心力鋳造用モールドのタイヤ部の縦断面図である。この図に示すように、タイヤ部５の内面には幅広の浅い溝がモールド内面を軸周りに一周するように彫られ、その内表面にも耐火材１１が斑なくコーティングされている。
溝の底面は、内径が一定でモールドと同心の円筒の内面形状を成しており、その底面の両側にはなだらかなテーパ面がつながり、一定の内径寸法に仕上がった他の直部に接続されている。Ｄｔは、タイヤ部５の内面の内径寸法、つまり、溝の底面における内径寸法であり、Ｄｓはその他の直部の均一な内径寸法を表し、溝の段差ｈは｛（Ｄｔ−Ｄｓ）÷２｝となる。
なお、接合部７やタイヤ部５’の内面形状も、タイヤ部５と同様の形状になっている。
FIG. 3 is a longitudinal sectional view of a tire portion of a centrifugal casting mold. As shown in this figure, a wide and shallow groove is carved on the inner surface of the tire portion 5 so as to go around the inner surface of the mold around the axis, and the inner surface is coated with the refractory material 11 without any spots.
The bottom surface of the groove has a constant inner diameter and forms the inner surface of a cylinder concentric with the mold. Both sides of the bottom surface are connected to other taper parts that have a constant inner diameter. ing. Dt is the inner diameter dimension of the inner surface of the tire portion 5, that is, the inner diameter dimension at the bottom surface of the groove, Ds represents the uniform inner diameter dimension of the other straight portions, and the groove step h is {(Dt−Ds) / 2. }.
The inner surface shape of the joint portion 7 and the tire portion 5 ′ is also the same shape as the tire portion 5.
呼び口径１５００ｍｍで長さ６ｍのＵ形ダクタイル鋳鉄管を、本発明に係る遠心力鋳造用モールドを使って製造した。
使用したモールドの接合部とタイヤ部は、他の直部形成部分と比べて厚みが約５０〜２００ｍｍほど大きく、肉厚になっている。それら肉厚な突出部の内面にはそれぞれ一周する浅い溝が彫られ、突出部の内径は、他の直部形成部分の均一な内径と比べて大きくなっている。その溝は、図３に示す前述の形状に彫られ、溝の段差寸法ｈが０．５〜５ｍｍの範囲内に入る大きさに仕上げられている。
A U-shaped ductile cast iron pipe having a nominal diameter of 1500 mm and a length of 6 m was manufactured using the centrifugal casting mold according to the present invention.
The used joint part and tire part of the used mold are thicker by about 50 to 200 mm than other straight part forming parts, and are thick. Shallow grooves are formed on the inner surfaces of these thick protrusions, and the inner diameter of the protrusions is larger than the uniform inner diameter of the other straight part forming portions. The groove is carved into the above-described shape shown in FIG. 3 and finished to a size in which the groove step size h falls within the range of 0.5 to 5 mm.
このモールドを使って鋳造した管を焼鈍してから、外面をショットブラストで研掃した後、管直部の外周長を測定して外径寸法を算出したところ、突出部の内面に対応する部分とその他の部分との外径寸法の差はほとんどなく、ほぼ均一な外径に仕上がっていた。 After annealing the pipe cast using this mold, the outer surface was blasted with shot blasting, and the outer diameter was calculated by measuring the outer peripheral length of the straight part of the tube. The part corresponding to the inner surface of the protrusion There was almost no difference in the outer diameter between the other parts and the other parts, and the outer diameter was almost uniform.
一方、図５に示すような従来のモールドを使って同種のダクタイル鋳鉄管を遠心力鋳造法で製造して同様に鋳造管の直部の外径寸法を算出したところ、突出部の内面に対応する部分とその他の部分との外径寸法の差は、本発明に係るモールドを使用した場合に比べて大きくなった。 On the other hand, when the same type of ductile cast iron pipe is manufactured by the centrifugal casting method using the conventional mold as shown in FIG. 5 and the outer diameter of the direct part of the cast pipe is calculated in the same manner, it corresponds to the inner surface of the protruding part The difference in the outer diameter between the part to be performed and the other part was larger than that in the case of using the mold according to the present invention.
なお、突出部の内面形状として、実施例では図３に示すように内径一定の底面を有する内周溝を設けた形状をあげたが、他に、図４（ａ）に示す様に、内径一定の底面を設けずにテーパ面同士を直接つなげた形状にしても良いし、同図（ｂ）に示すような、なだらかな曲面形状としてもよい。 In addition, as an inner surface shape of the projecting portion, in the embodiment, a shape provided with an inner peripheral groove having a bottom surface having a constant inner diameter as shown in FIG. 3 is given. However, as shown in FIG. The taper surfaces may be directly connected without providing a fixed bottom surface, or may be a gently curved shape as shown in FIG.
１、１’ 遠心力鋳造用モールド
２ 回転ローラー
３ トラフ
４ 取鍋
５、５’ タイヤ部（突出部）
７ 接合部（突出部）
８ 溶鉄
９ 鋳造管
１０ 蓋板
１１ 耐火材
Ｄｔ、Ｄｓ 内径寸法
ｈ 段差寸法
Ｓ 直部形成部分
Ｊ 受口形成部分
ｔ１、ｔ２ 突出量
1, 1 'Mold for centrifugal casting
2 Rotating roller 3 Trough 4 Ladle 5, 5 'Tire part (protruding part)
7 Junction (protruding part)
8 Molten iron 9 Cast pipe 10 Cover plate 11 Refractory material Dt, Ds Inner diameter dimension h Step dimension S Direct part formation part J Receptacle formation part t1, t2 Projection amount
Claims (1)
前記突出部が円筒形金型の外面で軸周りに一周する突条であり、この遠心力鋳造用モールドで鋳造する管の直部を形成するための鋳型となる直部形成部分の外面に前記突出部を設け、突出部以外の直部形成部分の内径寸法が一定であり、その内径寸法よりも突出部の内径寸法が大きいことを特徴とする遠心力鋳造用モールド。 A centrifugal casting mold having a protrusion on the outer surface of a cylindrical mold,
The protrusion is a ridge that makes a round around the axis on the outer surface of the cylindrical mold, and the protrusion is formed on the outer surface of the straight portion forming portion that becomes a mold for forming the straight portion of the tube cast by the centrifugal casting mold. A centrifugal casting mold characterized in that a projecting portion is provided, the inner diameter dimension of a straight portion forming portion other than the projecting section is constant, and the inner diameter dimension of the projecting section is larger than the inner diameter dimension.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011153469A JP2013018029A (en) | 2011-07-12 | 2011-07-12 | Centrifugal casting mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011153469A JP2013018029A (en) | 2011-07-12 | 2011-07-12 | Centrifugal casting mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2013018029A true JP2013018029A (en) | 2013-01-31 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2011153469A Withdrawn JP2013018029A (en) | 2011-07-12 | 2011-07-12 | Centrifugal casting mold |
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| Country | Link |
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| JP (1) | JP2013018029A (en) |
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2011
- 2011-07-12 JP JP2011153469A patent/JP2013018029A/en not_active Withdrawn
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