JP5021840B1 - Core pin - Google Patents

Core pin Download PDF

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JP5021840B1
JP5021840B1 JP2011286380A JP2011286380A JP5021840B1 JP 5021840 B1 JP5021840 B1 JP 5021840B1 JP 2011286380 A JP2011286380 A JP 2011286380A JP 2011286380 A JP2011286380 A JP 2011286380A JP 5021840 B1 JP5021840 B1 JP 5021840B1
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pin
split member
tip
cast
cooling pipe
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JP2013132677A (en
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悟 秋津
伸彦 山本
千秋 池本
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Kawasaki Motors Ltd
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Kawasaki Jukogyo KK
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Abstract

【課題】細くて長い鋳抜きピンの外周面の加工及び細くて深い冷却管挿入孔の加工が容易に行え、かつ、コストを節約できる鋳抜きピンを提供する。
【解決手段】金型1のキャビティ1b内に突出する成形面11aを有するピン先端部11と、冷却管21を挿入するための開口14を有するピン基端部13と、前記開口から前記ピン先端部内まで冷却管を導くための冷却管挿入孔15と、を有しており、前記鋳抜きピン全体を、ピン長さ方向に複数の分割部材26,27,28に分割し、前記ピン先端部を含む先端分割部材26には、前記金型のピン取付孔2に嵌合してピン径方向の位置決めを行う外周嵌合面12が形成され、前記先端分割部材以外の分割部材には、前記金型の座面3aに当接して、ピン長さ方向の位置決めを行う段部13aが形成されている。
【選択図】図1
An object of the present invention is to provide a cast pin that can easily process an outer peripheral surface of a thin and long cast pin and process a thin and deep cooling pipe insertion hole and can save costs.
A pin tip end portion 11 having a molding surface 11a protruding into a cavity 1b of a mold 1, a pin base end portion 13 having an opening 14 for inserting a cooling pipe 21, and the pin tip end from the opening. A cooling pipe insertion hole 15 for guiding the cooling pipe to the inside of the part, and the entire casting pin is divided into a plurality of divided members 26, 27, 28 in the pin length direction, and the tip end part of the pin The front end split member 26 includes an outer peripheral fitting surface 12 that is fitted in the pin mounting hole 2 of the mold and performs positioning in the pin radial direction, and the split members other than the front end split member include the A step portion 13a for positioning in the pin length direction is formed in contact with the mold seat surface 3a.
[Selection] Figure 1

Description

本発明は、鋳造時に、凹部や孔を形成するために金型に装着される鋳抜きピンに関し、特に、鋳抜きピン内に冷却管を配置している鋳抜きピンに関する。   The present invention relates to a core pin that is mounted on a mold in order to form a recess or a hole during casting, and more particularly to a core pin in which a cooling pipe is disposed in the core pin.

従来の鋳抜きピンは、図13に示すように、金型のキャビティ内に突出する成形面100aを有するピン先端部100と、冷却管(図示せず)を挿入するための開口103を有する頭部(ピン基端部)104と、を有すると共に、内部には、前記開口103から前記ピン先端部100内まで冷却管を配置するための冷却管挿入孔108が形成されている。そして、鋳造成形時に、冷却管からピン先端部100内に供給される冷却水により、成形面100aを冷却し、製品に各種穴等を形成するようになっている。   As shown in FIG. 13, the conventional core pin has a pin tip portion 100 having a molding surface 100a protruding into a mold cavity and a head having an opening 103 for inserting a cooling pipe (not shown). And a cooling pipe insertion hole 108 for disposing a cooling pipe from the opening 103 to the inside of the pin distal end portion 100. And at the time of casting molding, the molding surface 100a is cooled with the cooling water supplied into the pin front-end | tip part 100 from a cooling pipe, and various holes etc. are formed in a product.

前記鋳抜きピンは、一般に、頭部104からピン先端部100に至るまで、全体が一体物として形成されており、鋳抜きピンを製造する時には、単一の材料に、前記成形面100a、ピン長さ方向の位置決めを行う段部104a及び鋳抜きピンの径方向の位置決めを行う嵌合外周面105等が、機械加工により成形される。   The cast pin is generally formed as a whole from the head 104 to the pin tip 100, and when the cast pin is manufactured, the molding surface 100a and the pin are formed into a single material. A stepped portion 104a for positioning in the length direction, a fitting outer peripheral surface 105 for positioning in the radial direction of the core pin, and the like are formed by machining.

図13のような一体成形構造の鋳抜きピンの他に、特許文献1に記載されているように、鋳抜きピンを、成形面が形成されたピン先端部を含む先端側分割部材と、冷却管挿入用の開口を有する基端側分割部材とに、ピン長さ方向に2分割したものもある。これによると、鋳抜きピン自体の加工及び冷却管挿入孔の加工が容易になる。   In addition to the cast pin having an integrally formed structure as shown in FIG. 13, as described in Patent Document 1, the cast pin is divided into a tip side split member including a pin tip portion on which a molding surface is formed, and cooling. There is also a base end-side split member having an opening for inserting a pipe that is split into two in the pin length direction. According to this, the processing of the casting pin itself and the processing of the cooling pipe insertion hole are facilitated.

特開2010−149124号公報JP 2010-149124 A

前者の従来例(図13)のように、鋳抜きピン全体を一体物として構成していると、鋳抜きピンの基端から先端に至る細くて深い(長い)冷却管挿入孔108を、機械加工しなければならないが、その場合、ガンドリルのような特殊な設備を必要とし、冷却管挿入孔108の機械加工に手間がかかり、製作コストが高くなる。また、細くて深い冷却管挿入孔を有する鋳抜きピンは、交換頻度が高く、ランニングコストも高くなる。   As in the former conventional example (FIG. 13), if the entire core pin is configured as a single body, a thin and deep (long) cooling pipe insertion hole 108 extending from the base end to the tip end of the core pin is provided in the machine. In this case, special equipment such as a gun drill is required, and the machining of the cooling pipe insertion hole 108 is troublesome and the manufacturing cost is increased. Moreover, the casting pin which has a thin and deep cooling pipe insertion hole has high replacement frequency, and a running cost also becomes high.

また、鋳抜きピンは、使用を重ねるに従い、高温の溶湯に直接曝される成形面が早く消耗するが、その他の部分は、成形面を有するピン先端部に比べると、消耗の心配は殆どない。ところが、成形面100aのみが早く消耗した場合でも、ピン先端部100と共に、消耗していない頭部を含めたピン全体を、交換しなければならない。このとき、金型全体を分解してピン交換しなければならず、交換作業に手間がかかる。   In addition, as the core pin is used repeatedly, the molding surface that is directly exposed to the high-temperature molten metal is quickly consumed, but there is almost no worry about the consumption of the other portions compared to the tip of the pin having the molding surface. . However, even when only the molding surface 100a is quickly consumed, the entire pin including the unconsumed head must be replaced together with the pin tip 100. At this time, it is necessary to disassemble the entire mold and replace the pins, which takes time and labor.

後者の従来例(特許文献1)のように、鋳抜きピンを長さ方向に2分割している場合には、図13の一体構造物と比べ、冷却管挿入孔及び鋳抜きピンの外周面等の加工が容易になる。ところが、特許文献1の鋳抜きピンは、先端側の分割部材に、成形面と、ピン長さ方向の位置決め用の段部と、ピン径方向の位置決め用の外周面と、を形成しているので、先端側の分割部材のコストが高くなる。すなわち、成形面を有するピン先端部は、耐熱性の高い高価な熱間工具鋼を使用する必要があるが、その他の段部等は、耐熱性があまり必要ないにも拘わらず、ピン先端部と同じ高価な熱間工具鋼で製作することになり、コストが高くなる。   When the cast pin is divided into two in the length direction as in the latter conventional example (Patent Document 1), the outer peripheral surface of the cooling pipe insertion hole and the cast pin is compared with the integrated structure of FIG. Such processing becomes easy. However, the cast pin of Patent Document 1 forms a molding surface, a stepped portion for positioning in the pin length direction, and an outer peripheral surface for positioning in the pin radial direction on the tip-side divided member. As a result, the cost of the split member on the tip side increases. That is, it is necessary to use expensive hot tool steel with high heat resistance for the pin tip portion having a molding surface, but other stepped portions, etc., although the heat resistance is not so necessary, the pin tip portion The same expensive hot work tool steel is used, which increases the cost.

また、ピン先端部の分割部材にピン軸方向の位置決め用の段部を形成しているので、金型の外周面に形成される座ぐり部が深くなり、金型(主型)の座ぐり部の機械加工が困難になる。   Further, since the stepped portion for positioning in the pin axis direction is formed on the split member at the tip of the pin, the spot facing formed on the outer peripheral surface of the mold becomes deep, and the spot facing of the mold (main mold) Machining of the part becomes difficult.

本発明は、細くて長い鋳抜きピンの外周面の加工及び細くて深い冷却管挿入孔の加工が容易に行え、かつ、コストを節約できる鋳抜きピンを提供することを目的としている。   An object of the present invention is to provide a cast pin that can easily process the outer peripheral surface of a thin and long cast pin and process a thin and deep cooling pipe insertion hole and can save cost.

本発明は、金型のキャビティ内に突出する成形面を有するピン先端部と、冷却管を挿入するための開口を有するピン基端部と、前記開口から前記ピン先端部内まで冷却管を導くための冷却管挿入孔と、を有している鋳抜きピンにおいて、前記鋳抜きピンを、前記ピン先端部を含む先端分割部材と、前記ピン基端部を含む基端分割部材と、前記先端分割部材と前記基端分割部材とを連結する中間分割部材とに3分割し、前記先端分割部材には、前記金型のピン取付孔に嵌合してピン径方向の位置決めを行う外周嵌合面が形成され、前記基端分割部材には、前記金型の座面に当接して、ピン長さ方向の位置決めを行う段部が形成されている。 The present invention is directed to a pin tip portion having a molding surface protruding into a cavity of a mold, a pin base end portion having an opening for inserting a cooling tube, and guiding the cooling tube from the opening into the pin tip portion. In the cast pin having the cooling pipe insertion hole, the cast pin is divided into a tip split member including the pin tip end portion, a base end split member including the pin base end portion, and the tip split portion. An outer peripheral fitting surface that divides the member into an intermediate divided member that connects the base end divided member to the distal divided member and that fits in a pin mounting hole of the mold to perform positioning in the pin radial direction. There are formed, on the front Kimototan dividing member, in contact with the seating surface of the mold, a step portion for positioning the pin length direction are formed.

本発明は、好ましくは、上記構成に加え、次の構成を備えることができる。
(a)前記先端分割部材は、前記中間分割部材に対し、ねじ構造(ねじ結合部)により着脱自在に接続されている。
The present invention can preferably include the following configuration in addition to the above configuration.
(A) The tip split member is detachably connected to the intermediate split member by a screw structure (screw coupling portion).

(b)前記冷却管挿入孔に挿入される冷却管は、外管と内管とを備え、前記外管は、前記開口から前記先端分割部材の冷却管挿入孔部分の基端側の端部に至り、該端部にシールを介して嵌合し、前記内管の先端は、前記外管から更に先端側に突出している (B) The cooling pipe inserted into the cooling pipe insertion hole includes an outer pipe and an inner pipe, and the outer pipe is an end portion on the proximal end side of the cooling pipe insertion hole portion of the tip split member from the opening. The end of the inner tube protrudes further from the outer tube toward the distal end side .

(c)前記先端分割部材は、前記中間分割部材に対し、前記金型のキャビティ内に抜き取り可能に接続されている。この場合、さらに好ましくは、前記ピン先端部を有する前記先端分割部材には、前記中間分割部材から前記先端分割部材を取り外すための工具用の係合部が形成されている。 (C) The tip split member is detachably connected to the intermediate split member in the cavity of the mold. In this case, more preferably, a tool engaging portion for removing the tip split member from the intermediate split member is formed on the tip split member having the pin tip portion.

(d)本発明は、溶接を利用して先端分割部材と中間分割部材と基端分割部材と、を互いに結合する構造も含まれる。 (D) The present invention also includes a structure in which the tip split member, the intermediate split member, and the base end split member are coupled to each other using welding.

本発明によると、鋳抜きピンを、成形面を有する先端分割部材と、基端分割部材と、中間分割部材とに3分割するので、2分割及び一体構造に比べ、細くて長い鋳抜きピンの外周面の加工及び細くて深い冷却管挿入孔の加工が、特別な設備を使用することなく、通常の旋盤加工あるいはドリル加工で簡単に行うことができる。しかも、3分割構造において、先端分割部材にピン径方向の位置決め用の外周嵌合面を形成し、基端分割部材にピン長さ方向の位置決め用の段部を形成しているので、中間分割部材は位置決め用の加工を施す必要がなく、したがって、中間分割部材として、単なる直筒状の鋼管を利用し、その長さを変更することにより、全長の異なる寸法の鋳抜きピンを、簡単に製作することができる。また、コストも低減できる。 According to the present invention, the cast pin is divided into three parts, that is, a front end split member having a molding surface, a base end split member, and an intermediate split member . The processing of the outer peripheral surface and the processing of the narrow and deep cooling pipe insertion hole can be easily performed by ordinary lathe processing or drilling processing without using special equipment. Moreover, in the three-divided structure, an outer peripheral fitting surface for positioning in the pin radial direction is formed on the tip split member, and a step portion for positioning in the pin length direction is formed on the base split member, so that the intermediate split The member does not need to be processed for positioning. Therefore, simply using a straight cylindrical steel pipe as the intermediate divided member and changing its length makes it easy to produce cast pins with different lengths. can do. Also, the cost can be reduced.

また、細くて深い冷却管挿入孔を容易に加工できるので、鋳抜きピンの外径も細く保つことができ、複数の鋳抜きピンを、金型内に狭い間隔で配置することが可能となる。たとえば、複数のねじ孔を高い配置密度で配置する場合、すなわち、ねじ孔を狭い範囲に多数配置する場合に、好都合である。   Moreover, since the thin and deep cooling pipe insertion hole can be easily processed, the outer diameter of the core pin can be kept small, and a plurality of core pins can be arranged in the mold at a narrow interval. . For example, it is advantageous when a plurality of screw holes are arranged at a high arrangement density, that is, when a large number of screw holes are arranged in a narrow range.

前記構成(a)のねじによる結合構造を採用すると、成形面を有する先端分割部材のみを、他の分割部材に対し、金型のキャビティ側から取り外すことができる。すなわち、金型全体を分解することなく、かつ、他の分割部材を取り外すことなく、成形面を有する先端分割部材のみを交換し、あるいはメンテナンスすることができる。 When the coupling structure using the screw of the configuration (a) is employed, only the tip split member having the molding surface can be removed from the cavity side of the mold with respect to the other split members. That is, it is possible to replace or maintain only the tip split member having the molding surface without disassembling the entire mold and without removing other split members.

前記構成(b)によると、先端分割部材の冷却管挿入孔で、冷却管のシールを行っているので、分割部材同士の接続部において、特にシール性を確保する必要がなく、製造に手間がかからない。 According to the configuration (b) , since the cooling pipe is sealed by the cooling pipe insertion hole of the tip split member, it is not necessary to secure the sealing property at the connecting portion between the split members, and the manufacturing is troublesome. It does not take.

前記構成(c)のように、ピン先端部がキャビティ内に抜き取り可能な構造において、先端分割部材に工具用の係合部を設けていることにより、鋳抜きピンの分解作業が、簡単に行える。 In the structure in which the tip end of the pin can be extracted into the cavity as in the configuration (c) , the disassembly of the core pin can be easily performed by providing the engaging portion for the tool on the tip split member. .

構成(d)のような溶接結合構造を採用した場合には、鋳抜きピンの全体のシール機能を向上させることができる。 When the welded joint structure as in the configuration (d) is adopted, the entire sealing function of the core pin can be improved.

本発明に係る鋳抜きピンの第1の実施の形態の縦断面図である。It is a longitudinal cross-sectional view of 1st Embodiment of the core pin which concerns on this invention. 図1の鋳抜きピンのII矢視拡大図である。It is an II arrow enlarged view of the core pin of FIG. 二重冷却管の断面拡大図(図7のIII-III断面図)である。It is a cross-sectional enlarged view (III-III cross-sectional view of FIG. 7) of the double cooling pipe. 図1の鋳抜きピンを分解した時の基端分割部材の縦断面図である。It is a longitudinal cross-sectional view of a base end division member when the core pin of FIG. 1 is disassembled. 図1の鋳抜きピンを分解した時の中間分割部材の縦断面図である。It is a longitudinal cross-sectional view of an intermediate | middle division member when the core pin of FIG. 1 is decomposed | disassembled. 図1の鋳抜きピンを分解した時の先端分割部材の縦断面図である。It is a longitudinal cross-sectional view of the front-end | tip division | segmentation member when the core pin of FIG. 1 is disassembled. 冷却管の側面図である。It is a side view of a cooling pipe. 本発明に係る鋳抜きピンの第2の実施の形態の縦断面図である。It is a longitudinal cross-sectional view of 2nd Embodiment of the core pin which concerns on this invention. 鋳抜きピンの参考例の側面図である。It is a side view of the reference example of a cast pin . 図9のX-X断面図である。It is XX sectional drawing of FIG. 工具用係合部の変形例を示す拡大正面図である。It is an enlarged front view which shows the modification of the engaging part for tools. 工具用係合部の別の変形例を示す拡大正面図である。It is an enlarged front view which shows another modification of the engaging part for tools. 従来例の側面図である。It is a side view of a prior art example.

図1乃至図8は、本発明に係る鋳抜きピンの第1の実施の形態を示しており、これらの図面に基づいて、第1の実施の形態を説明する。   1 to 8 show a first embodiment of a cast pin according to the present invention, and the first embodiment will be described based on these drawings.

[ピン取付孔2の構成]
図1は、ダイカスト等の金型(主型)1のピン取付孔2に、鋳抜きピン10を取り付けた状態を示している。ピン取付孔2は、金型1のキャビティ1b側の端部に形成されたピン径方向の位置決め部(範囲L2)4と、金型1の外周面1a側の端部に形成された座ぐり部3と、該座ぐり部3と前記ピン径方向の位置決め部4との間に形成された中間部5と、から構成されている。
[Configuration of Pin Mounting Hole 2]
FIG. 1 shows a state in which a core pin 10 is attached to a pin attachment hole 2 of a die (main mold) 1 such as die casting. The pin mounting hole 2 includes a pin radial positioning portion (range L2) 4 formed at the end of the mold 1 on the cavity 1b side, and a spot facing formed at the end of the mold 1 on the outer peripheral surface 1a side. It is comprised from the part 3, and the intermediate part 5 formed between this counterbore part 3 and the positioning part 4 of the said pin radial direction.

ピン径方向の位置決め部4は、鋳抜きピン10に形成されたピン径方向の位置決め用の外周嵌合面(範囲L1)12に嵌合する大きさの内径を有し、中間部5は、ピン径方向の位置決め部4の内径より大きく、中間部5の内周面と鋳抜きピン10の外周面との間で環状空間部Sを形成しうる大きさの内径を有し、座ぐり部3は、中間部5の内径よりも大きく、鋳抜きピン10の頭部(ピン基端部)13を収納しうる大きさの内径を有している。座ぐり部3の座面3aは、鋳抜きピン10のピン長さ方向の位置決めを行うために、キャビティ1b側の孔端縁1dから所定の距離を置いた位置に形成されている。   The pin radial positioning portion 4 has an inner diameter large enough to fit the pin radial positioning outer peripheral fitting surface (range L1) 12 formed in the core pin 10, and the intermediate portion 5 A counterbore portion having an inner diameter that is larger than the inner diameter of the positioning portion 4 in the pin radial direction and is large enough to form an annular space S between the inner peripheral surface of the intermediate portion 5 and the outer peripheral surface of the core pin 10. 3 has an inner diameter that is larger than the inner diameter of the intermediate portion 5 and that can accommodate the head (pin base end portion) 13 of the core pin 10. The seat surface 3a of the counterbore part 3 is formed at a predetermined distance from the hole edge 1d on the cavity 1b side in order to position the core pin 10 in the pin length direction.

[鋳抜きピン10の構成]
図1において、鋳抜きピン10は、金型1のキャビティ1b内に突出するピン先端部11と、金型1の外周面1a側の端部に形成されると共に冷却管挿入用の開口14を有する頭部(ピン基端部)13と、を有すると共に、前記開口14から前記ピン先端部11の先端付近まで、直線状に鋳抜きピン10内を延びる冷却管挿入孔15が形成されており、かつ、ピン先端部11の外周面には、製品を成形するためのテーパー状の成形面11aが形成されている。さらに、ピン先端部11に隣接する部分に、前述のように、ピン取付孔2のピン径方向の位置決め部4に嵌合する外周嵌合面(範囲L1)12が形成されており、この外周嵌合面12と位置決め部4の内周面との嵌合により、ピン径方向の位置決めを行うようになっている。鋳抜きピン10の頭部13は、押さえ部材43によりピン取付孔2内へ押さえ付けられ、頭部13の段部13aが座ぐり部3の座面3aに当接することにより、ピン長さ方向の位置決めが為されている。
[Configuration of core pin 10]
In FIG. 1, a cast pin 10 has a pin tip 11 protruding into a cavity 1b of a mold 1 and an end 14 on the outer peripheral surface 1a side of the mold 1 and an opening 14 for inserting a cooling pipe. And a cooling pipe insertion hole 15 extending linearly from the opening 14 to the vicinity of the tip of the pin tip 11 is formed in the casting pin 10. And the taper-shaped molding surface 11a for shape | molding a product is formed in the outer peripheral surface of the pin front-end | tip part 11. As shown in FIG. Further, as described above, an outer peripheral fitting surface (range L1) 12 that fits the positioning portion 4 in the pin radial direction of the pin mounting hole 2 is formed in a portion adjacent to the pin tip portion 11. Positioning in the pin radial direction is performed by fitting between the fitting surface 12 and the inner peripheral surface of the positioning portion 4. The head 13 of the core pin 10 is pressed into the pin mounting hole 2 by the pressing member 43, and the stepped portion 13 a of the head 13 abuts against the seating surface 3 a of the counterbore portion 3, so that the pin length direction Is positioned.

そして、鋳抜きピン10は、ピン長さ方向に3分割されている。すなわち、ピン先端部11及びピン径方向の位置決め用の外周嵌合面12を含む先端分割部材26と、頭部13を含む基端分割部材28と、該基端分割部材28と先端分割部材26とを結合する中間分割部材27とを、同一のピン軸芯O1上に備えている。該実施の形態では、前記3つの分割部材26,27,28は、第1及び第2のねじ結合部31,32により、取り外し自在に結合されている。   The core pin 10 is divided into three in the pin length direction. That is, the distal end split member 26 including the pin distal end portion 11 and the outer peripheral fitting surface 12 for positioning in the pin radial direction, the proximal end split member 28 including the head 13, the proximal end split member 28 and the distal end split member 26 Are provided on the same pin axis O1. In the embodiment, the three divided members 26, 27, 28 are detachably coupled by the first and second screw coupling portions 31, 32.

冷却管挿入孔15内には、成形面11aを冷却するために、二重冷却管(仮想線)21が開口14側から挿入されている。二重冷却管21の基端部は、金型1の外周面1aから外方へ突出し、その外方端部に冷却管ヘッド23が設けられており、該冷却管ヘッド23には、冷却水導入管23aと冷却水排出管23bとが接続されている。   A double cooling pipe (virtual line) 21 is inserted into the cooling pipe insertion hole 15 from the opening 14 side in order to cool the molding surface 11a. The base end portion of the double cooling pipe 21 protrudes outward from the outer peripheral surface 1a of the mold 1, and a cooling pipe head 23 is provided at the outer end thereof. The introduction pipe 23a and the cooling water discharge pipe 23b are connected.

図3は二重冷却管21の断面拡大図(図7のIII-III断面拡大図)であり、二重冷却管は、外管21aと内管21bとから構成されており、内管21b内が冷却水導入通路として利用され、内管21bと外管21aとの間の環状空間21cが冷却水排出通路として利用される。   FIG. 3 is an enlarged cross-sectional view of the double cooling pipe 21 (III-III cross-sectional enlarged view of FIG. 7). The double cooling pipe is composed of an outer pipe 21a and an inner pipe 21b. Is used as the cooling water introduction passage, and the annular space 21c between the inner tube 21b and the outer tube 21a is used as the cooling water discharge passage.

図7は、二重冷却管21の側面図であり、外管21a及び内管21bの基端は冷却ヘッド23に片持ち状に固定支持されており、外管21aの先端部の外周面に形成された一対の環状溝に、一対のシール部材38がそれぞれ嵌着されている。内管21bは、外管21aの先端から更に突出している。   FIG. 7 is a side view of the double cooling pipe 21, and the base ends of the outer pipe 21a and the inner pipe 21b are fixedly supported in a cantilever manner on the cooling head 23, and are arranged on the outer peripheral surface of the distal end portion of the outer pipe 21a. A pair of seal members 38 are fitted into the pair of annular grooves formed. The inner tube 21b further protrudes from the tip of the outer tube 21a.

図1に戻り、外管21aの先端部は、先端分割部材26と中間分割部材27との第1のねじ結合部31をピン先端側へ通過し、先端分割部材26の冷却管挿入孔部分15aの基端側の端部に形成されたシール面(内周面)40に、前記シール38を介して液密状態に嵌合している。一方、外管21aの先端から突出する内管21bは、先端分割部材26の冷却管挿入孔部分15aの先端部近傍に至っている。   Returning to FIG. 1, the distal end portion of the outer tube 21 a passes through the first screw coupling portion 31 of the distal end split member 26 and the intermediate split member 27 to the pin distal end side, and the cooling tube insertion hole portion 15 a of the distal end split member 26. A seal surface (inner peripheral surface) 40 formed at the end of the base end side is fitted in a liquid-tight state via the seal 38. On the other hand, the inner tube 21 b protruding from the tip of the outer tube 21 a reaches the vicinity of the tip of the cooling tube insertion hole portion 15 a of the tip split member 26.

図4は、基端分割部材28の縦断面拡大図であり、一般構造用鋼材でできており、前述のように頭部13及びピン長さ方向の位置決めを行う段部13aを有すると共に、ピン長さ方向の先端側(開口14と反対側)の端部に、第2のねじ結合部32用のおねじ32aを有している。   FIG. 4 is an enlarged vertical cross-sectional view of the base end dividing member 28, which is made of a general structural steel material, and has the head 13 and the step portion 13a for positioning in the pin length direction as described above, and the pin A male screw 32a for the second screw coupling portion 32 is provided at the end on the distal end side (opposite side of the opening 14) in the length direction.

図5は、中間分割部材27の縦断面拡大図であり、市販の鋼管を使用しており、ピン長さ方向の基端側の端部に、第2のねじ結合部32用のめねじ32bが形成され、ピン長さ方向の先端側の端部に、第1のねじ結合部31用のめねじ31bが形成されている。   FIG. 5 is an enlarged vertical cross-sectional view of the intermediate split member 27, which uses a commercially available steel pipe, and has a female screw 32 b for the second screw coupling portion 32 at the proximal end in the pin length direction. Is formed, and a female screw 31b for the first screw coupling portion 31 is formed at the end on the tip end side in the pin length direction.

図6は、先端分割部材26の縦断面拡大図であり、成形面11aの耐熱性及び耐久性を維持するために、熱間工具鋼が使用されており、ピン長さ方向の基端部に、第1のねじ結合部31用のおねじ31aが形成され、該おねじ31aの内周面に、前述のように、二重冷却管21の外管21aの先端部外周面が嵌合するシール面40が形成されている。さらに、成形面11aの基端側の端部の外周面には、工具係合用の係合部35が形成されている。この係合部35は、鋳抜きピン10の取付時において、キャビティ1b内に露出している。ちなみに、該成形面11aによって成形される製品の凹部は、細長いボルト孔用の下孔である。   FIG. 6 is an enlarged vertical cross-sectional view of the tip split member 26. Hot tool steel is used in order to maintain the heat resistance and durability of the molding surface 11a, and the base end portion in the pin length direction is used. The male screw 31a for the first screw coupling portion 31 is formed, and the outer peripheral surface of the distal end portion of the outer tube 21a of the double cooling tube 21 is fitted to the inner peripheral surface of the male screw 31a as described above. A sealing surface 40 is formed. Further, an engagement portion 35 for tool engagement is formed on the outer peripheral surface of the end portion on the proximal end side of the molding surface 11a. The engaging portion 35 is exposed in the cavity 1b when the cast pin 10 is attached. Incidentally, the concave portion of the product molded by the molding surface 11a is a pilot hole for an elongated bolt hole.

図2は、図1のII矢視拡大図であり、前記係合部35として、互いに平行な一対の平面が形成されており、スパナ等の工具が係合可能となっている。   FIG. 2 is an enlarged view taken along the arrow II in FIG. 1, and a pair of planes parallel to each other is formed as the engaging portion 35, and a tool such as a spanner can be engaged therewith.

[鋳抜きピンの取付]
(1)図1において、鋳抜きピン10は、第1及び第2のねじ結合部31,32により、3つの分割部材26,27、28が同一のピン軸芯O1上で結合され、金型1のピン取付孔2内に、座ぐり部3から挿入され、押さえ部材43により、固定される。
[Installation of cast pin]
(1) In FIG. 1, the core pin 10 has three divided members 26, 27, and 28 coupled on the same pin axis O1 by the first and second screw coupling portions 31 and 32, and a mold. 1 is inserted into the pin mounting hole 2 from the counterbore 3 and fixed by the pressing member 43.

この取付作業において、鋳抜きピン10の径方向に位置決めは、ピン取付孔2の位置決め部4の内周面と先端分割部材26の外周嵌合面12との嵌合により為され、ピン長さ方向の位置決めは、鋳抜きピン10の頭部13の段部13aと、ピン取付孔2の座ぐり部3の座面3aとの当接により、為される。なお、各分割部材26,27,28間の相互のピン長さ方向の位置決めは、たとえば、図5に示す中間分割部材27のピン長さ方向の端縁31c、32cと、図4及び図6に示す基端分割部材28及び先端分割部材26の各おねじ32a、31aの根元側の端縁45との当接により、為される。   In this mounting operation, the core pin 10 is positioned in the radial direction by fitting the inner peripheral surface of the positioning portion 4 of the pin mounting hole 2 with the outer peripheral fitting surface 12 of the tip split member 26, and the pin length. The positioning in the direction is performed by contact between the stepped portion 13a of the head portion 13 of the core pin 10 and the seating surface 3a of the spot facing portion 3 of the pin mounting hole 2. The positioning in the pin length direction between the divided members 26, 27, and 28 is performed, for example, by the edge 31c, 32c in the pin length direction of the intermediate divided member 27 shown in FIG. This is achieved by contact with the base end edge 45 of each of the male threads 32a and 31a of the proximal end split member 28 and the distal end split member 26 shown in FIG.

なお、別の取付順序として、まず、基端分割部材28と中間分割部材27とを連結し、金型1のピン取付孔2に予め取り付けておき、これに対し、先端分割部材26を、キャビティ1b側から挿入して、第1のねじ結合部31において中間分割部材27とねじ結合することも可能である。   As another mounting order, first, the base end split member 28 and the intermediate split member 27 are connected and previously attached to the pin mounting hole 2 of the mold 1. It is also possible to insert from the 1b side and to be screw-coupled to the intermediate split member 27 at the first screw coupling portion 31.

[鋳造作業]
図1において、金型1を使用した鋳造作業中、冷却水は、冷却水導入管23aから冷却管ヘッド23内の冷却水導入通路を通り、二重冷却管21の内管21b内に供給される。
[Casting work]
In FIG. 1, during the casting operation using the mold 1, the cooling water is supplied from the cooling water introduction pipe 23 a through the cooling water introduction passage in the cooling pipe head 23 into the inner pipe 21 b of the double cooling pipe 21. The

内管21b内をピン先端側に流れる冷却水は、内管21bの先端からピン先端部11の冷却管挿入孔部分15aの先端部分に供給され、成形面11a及びこれに接触している鋳造用の溶湯を冷却する。   The cooling water flowing in the inner tube 21b toward the pin tip side is supplied from the tip of the inner tube 21b to the tip portion of the cooling tube insertion hole portion 15a of the pin tip portion 11, and is used for casting in contact with the molding surface 11a. Cool the molten metal.

冷却に使用された冷却水は、ピン先端部11の冷却管挿入孔部分15a内をピン基端側へ戻り、第1のねじ結合部31よりもピン先端側の位置で、外管21a内に流入する。具体的には、図3に示す内管21bと外管21aとの間の環状空間21cに入り、冷却管ヘッド23内の冷却水排出通路から冷却水排出管23bを通り、金型1の外部に排出される。   The cooling water used for cooling returns to the pin proximal end side in the cooling pipe insertion hole portion 15a of the pin distal end portion 11, and enters the outer tube 21a at a position closer to the pin distal end side than the first screw coupling portion 31. Inflow. Specifically, it enters the annular space 21c between the inner pipe 21b and the outer pipe 21a shown in FIG. 3, passes through the cooling water discharge pipe 23b from the cooling water discharge passage in the cooling pipe head 23, and enters the outside of the mold 1. To be discharged.

[メンテナンス及び取り替え]
重なる使用により、成形面11aが消耗して交換時期が来た時には、キャビティ1b内から工具を係合部35に係合し、先端分割部材26をピン軸芯O1回りに回転することにより、先端分割部材26のみを、キャビティ1b内に抜き取る。
[Maintenance and replacement]
When the molding surface 11a is consumed due to overlapping use and the replacement time comes, the tool is engaged from the cavity 1b with the engaging portion 35, and the tip dividing member 26 is rotated around the pin axis O1, thereby leading the tip. Only the split member 26 is extracted into the cavity 1b.

そして、新たな先端分割部材あるいは修理した先端分割部材を、キャビティ1b側からピン取付孔2に挿入し、中間分割部材27にねじ結合する。
[実施の形態の効果]
Then, a new tip split member or a repaired tip split member is inserted into the pin mounting hole 2 from the cavity 1b side and screwed to the intermediate split member 27.
[Effect of the embodiment]

(1)図1において、鋳抜きピン10をピン長さ方向に3分割しているので、細くて深い冷却管挿入孔15の加工が、特殊な加工設備(たとえばガンドリル)を使用することなく、通常のドリル加工で簡単に行うことができる。また、鋳抜きピンの外周面の加工も、通常の旋盤加工により、容易に行える。しかも、鋳抜きピン10の外径も細く保つことができるので、複数の鋳抜きピンを、金型内に狭い間隔で配置することが可能となる。たとえば、複数のねじ孔を高い配置密度で配置する場合に、好都合である。 (1) In FIG. 1, since the core pin 10 is divided into three in the pin length direction, the processing of the thin and deep cooling pipe insertion hole 15 can be performed without using special processing equipment (for example, a gun drill). It can be done easily by ordinary drilling. Further, the outer peripheral surface of the cast pin can be easily processed by a normal lathe process. In addition, since the outer diameter of the core pin 10 can be kept small, a plurality of core pins can be arranged in the mold at narrow intervals. For example, it is convenient when a plurality of screw holes are arranged at a high arrangement density.

(2)成形面11aを含む先端分割部材26のみを、高価な熱間工具鋼で形成し、他の分割部材27,28を安価な一般構造用鋼材等で製造できるので、鋳抜きピン全体を熱間工具鋼で製作する構造に比べ、コストを低減できる。 (2) Only the tip split member 26 including the molding surface 11a is formed of expensive hot tool steel, and the other split members 27 and 28 can be manufactured of inexpensive general structural steel, etc. Costs can be reduced compared to structures made with hot tool steel.

(3)鋳抜きピン10を、成形面11aを有する先端分割部材26と、頭部13を有する基端分割部材28と、中間分割部材27とに3分割しているので、2分割及び一体構造に比べ、細くて深い冷却管挿入孔15を、一層容易に加工することができる。また、中間分割部材27として、単なる直筒状の鋼管を利用し、その長さを各種変更することにより、全長の異なる各種寸法の鋳抜きピン10を、簡単に製作することができる。 (3) Since the core pin 10 is divided into three parts, that is, a tip split member 26 having a molding surface 11a, a base end split member 28 having a head 13 and an intermediate split member 27. Compared to the above, the narrow and deep cooling pipe insertion hole 15 can be processed more easily. Further, by using a simple cylindrical steel pipe as the intermediate split member 27 and changing its length in various ways, it is possible to easily manufacture the core pins 10 having various lengths different from each other.

(4)先端分割部材26は、中間分割部材27に対して、第1のねじ結合31により着脱自在に結合されているので、成形面11aを有する先端分割部材26のみを、他の分割部材27,28に対し、金型1のキャビティ1b側から取り外すことができる。すなわち、金型を分解することなく、かつ、他の分割部材27,28を取り外すことなく、成形面11aを有する先端分割部材26のみを交換し、あるいはメンテナンスすることができる。 (4) Since the tip split member 26 is detachably coupled to the intermediate split member 27 by the first screw coupling 31, only the tip split member 26 having the molding surface 11a is replaced with the other split member 27. , 28 can be removed from the cavity 1 b side of the mold 1. That is, only the tip split member 26 having the molding surface 11a can be replaced or maintained without disassembling the mold and without removing the other split members 27 and 28.

(5)冷却管挿入孔15に挿入される冷却管21は、外管21aと内管21bとから二重管構造となっており、先端分割部材26の冷却管挿入孔部分15aには、前記外管21aがシール38を介して液密状態に嵌合するシール面40が形成されているので、分割部材同士の接続部(ねじ結合部31,32)において、特にシール性を確保する必要がなく、製造に手間がかからない。 (5) The cooling pipe 21 inserted into the cooling pipe insertion hole 15 has a double pipe structure composed of the outer pipe 21a and the inner pipe 21b, and the cooling pipe insertion hole portion 15a of the tip split member 26 includes Since the sealing surface 40 is formed in which the outer tube 21a is fitted in a liquid-tight state via the seal 38, it is necessary to ensure particularly a sealing property at the connecting portions (screw coupling portions 31, 32) between the divided members. There is no need for manufacturing.

[第2の実施の形態]
図8は、本発明に係る鋳抜きピン10の第2の実施の形態を示しており、ピン長さ方向に、先端分割部材26と、中間分割部材27と、基端分割部材28と、に3分割し、先端分割部材26に、成形面11aを有するピン先端部11及びピン径方向の位置決め用の外周嵌合面12を形成し、基端分割部材28の頭部13に、ピン長さ方向の位置決め用の段部13aを形成することは、第1の実施の形態と同様であるが、分割部材26,27,28同士を、ねじ結合部ではなくて、第1及び第2のいんろう嵌合部51,52a並びに第1及び第2の溶接部51b、52bで、同一ピン軸芯O1上で結合している。
[Second Embodiment]
FIG. 8 shows a second embodiment of the core pin 10 according to the present invention. In the pin length direction, a tip split member 26, an intermediate split member 27, and a base end split member 28 are arranged. The distal end split member 26 is divided into three parts, the pin distal end portion 11 having the molding surface 11a and the outer peripheral fitting surface 12 for positioning in the pin radial direction are formed, and the pin length is formed on the head 13 of the proximal end split member 28. Forming the step 13a for positioning in the direction is the same as in the first embodiment. However, the divided members 26, 27, and 28 are not the screw coupling portions but the first and second portions. The solder fitting portions 51 and 52a and the first and second welded portions 51b and 52b are coupled on the same pin axis O1.

また、該実施の形態では、基端分割部材28の冷却管挿入孔部分15cの内周面に、二重冷却管21(図7参照)の外周面が、シール部材を介して嵌合してもよい。また、先端分割部材26にシール部を設けても良い。   Further, in this embodiment, the outer peripheral surface of the double cooling pipe 21 (see FIG. 7) is fitted to the inner peripheral surface of the cooling pipe insertion hole portion 15c of the base end split member 28 via the seal member. Also good. Further, a seal portion may be provided on the tip split member 26.

該実施の形態のように、溶接による結合構造とすると、基端分割部材28の冷却管挿入孔15cに二重冷却管21の外管21aを嵌合している場合でも、分割部材26,27,28間の結合部のシール性は確保される。   As in the embodiment, when the joint structure is formed by welding, even when the outer pipe 21a of the double cooling pipe 21 is fitted in the cooling pipe insertion hole 15c of the base end split member 28, the split members 26 and 27 are combined. , 28 is ensured to be sealed.

参考例
図9は、鋳抜きピン10の参考例であり、たとえばエンジンの吸排気弁駆動用のプッシュロッド挿通孔を形成するための形状鋳抜きピンである(後述のように単純に丸形状ではない)。
[ Reference example ]
FIG. 9 is a reference example of the core pin 10 , for example, a shape core pin for forming a push rod insertion hole for driving an intake / exhaust valve of an engine (not simply a round shape as will be described later). .

該鋳抜きピン10は、二つの成形面11a(範囲L3)、11b(範囲L4)を有するピン先端部11を含む第1の先端分割部材26と、冷却管挿入用の開口14を有する基端分割部材28と、の2分割構造となっている。先端分割部材26に形成された二つの成形面11a、11bは、プッシュロッド嵌合孔を形成するための第1の成形面11aと、プッシュロッド嵌合孔よりも大きくてプッシュロッドが余裕を持って配置される挿通孔を形成する第2の成形面11bである。   The cast pin 10 includes a first tip split member 26 including a pin tip 11 having two molding surfaces 11a (range L3) and 11b (range L4), and a base end having an opening 14 for inserting a cooling pipe. It has a two-divided structure with the dividing member 28. The two molding surfaces 11a and 11b formed on the tip split member 26 are larger than the first molding surface 11a for forming the push rod fitting hole and the push rod fitting hole, and the push rod has a margin. It is the 2nd shaping | molding surface 11b which forms the insertion hole arrange | positioned.

なお、図1乃至図8と第1の実施の形態と同じ部品及び部分には、同じ番号を付してあり、また、二重冷却管は図示していない。   1 to 8 and the same parts and portions as those in the first embodiment are denoted by the same reference numerals, and a double cooling pipe is not shown.

図10は、図9のX-X断面拡大図であり、前記第1の成形面11aの断面形状は円形であるが、第2の成形面11bの断面形状及び外周嵌合面12の断面形状は、円から径方向の任意の方向に突出する部分を有する「だるま形」あるいは「長円形」に形成されている。   FIG. 10 is an enlarged cross-sectional view taken along the line XX of FIG. 9, and the cross-sectional shape of the first molding surface 11a is circular, but the cross-sectional shape of the second molding surface 11b and the cross-sectional shape of the outer peripheral fitting surface 12 are It is formed in a “daruma shape” or “oval shape” having a portion protruding from a circle in any radial direction.

[その他の実施の形態]
(1)図11は、ピン先端部11に形成される工具用係合部35の変形例を示しており、外周面が六角形状に形成されている。
[Other embodiments]
(1) FIG. 11 shows a modification of the tool engaging portion 35 formed at the pin tip portion 11, and the outer peripheral surface is formed in a hexagonal shape.

(2)図12は、ピン先端部11に形成される工具用係合部35の別の変形例を示しており、ピン先端部11の先端面に、六角穴が形成されている。 (2) FIG. 12 shows another modification of the tool engaging portion 35 formed on the pin tip portion 11, and a hexagonal hole is formed on the tip surface of the pin tip portion 11.

(3)本発明は、前記各実施の形態の構造に限定されるものではなく、特許請求の範囲に記載された内容内において、各種変形例が含まれる。


(3) The present invention is not limited to the structure of each of the embodiments described above, and includes various modifications within the scope of the claims.


1 金型
1b キャビティ
2 ピン取付孔
10 鋳抜きピン
11 ピン先端部
11a,11b 成形面
12 ピン径方向の位置決め用の外周嵌合面
13 頭部(ピン基端部)
13a 段部
14 開口
15 冷却管挿入孔
21二重冷却管
21a 外管
21b 内管
26 先端分割部材
27 中間分割部材
28 基端分割部材
31,32 第1及び第2のねじ結合部
35 工具用の係合部
38 シール部材
40 シール面
51b、52b 溶接部
DESCRIPTION OF SYMBOLS 1 Mold 1b Cavity 2 Pin attachment hole 10 Casting pin 11 Pin front-end | tip part 11a, 11b Molding surface 12 Outer peripheral fitting surface for positioning of pin radial direction 13 Head (pin base end part)
13a Step part 14 Opening 15 Cooling pipe insertion hole 21 Double cooling pipe 21a Outer pipe 21b Inner pipe 26 End split member 27 Intermediate split member 28 Base end split member 31, 32 First and second screw coupling portions 35 For tools Engagement portion 38 Seal member 40 Seal surface 51b, 52b Welded portion

Claims (6)

金型のキャビティ内に突出する成形面を有するピン先端部と、冷却管を挿入するための開口を有するピン基端部と、前記開口から前記ピン先端部内まで冷却管を導くための冷却管挿入孔と、を有している鋳抜きピンにおいて、
前記鋳抜きピンを、前記ピン先端部を含む先端分割部材と、前記ピン基端部を含む基端分割部材と、前記先端分割部材と前記基端分割部材とを連結する中間分割部材とに3分割し、
前記先端分割部材には、前記金型のピン取付孔に嵌合してピン径方向の位置決めを行う外周嵌合面が形成され、
記基端分割部材には、前記金型の座面に当接して、ピン長さ方向の位置決めを行う段部が形成されている、ことを特徴とする鋳抜きピン。
Pin tip having a molding surface protruding into the cavity of the mold, pin base end having an opening for inserting a cooling pipe, and cooling pipe insertion for guiding the cooling pipe from the opening into the pin tip In a core pin having a hole,
The cast pin is divided into a tip split member including the pin tip end portion, a base end split member including the pin base end portion, and an intermediate split member connecting the tip split member and the base end split member. Split and
The distal end split member is formed with an outer peripheral fitting surface that is fitted in the pin mounting hole of the mold and performs positioning in the pin radial direction,
The front Kimototan dividing member, comes into contact with the seating surface of the mold, a step portion for positioning the pin length direction are formed, punching cast and wherein the pin.
請求項1記載の鋳抜きピンにおいて、
前記先端分割部材は、前記中間分割部材に対し、ねじ構造により着脱自在に接続されている、鋳抜きピン。
The cast pin according to claim 1,
The tip split member is a cast pin that is detachably connected to the intermediate split member by a screw structure.
請求項1又は2に記載の鋳抜きピンにおいて、
前記冷却管挿入孔に挿入される冷却管は、外管と内管とを備え、
前記外管は、前記開口から前記先端分割部材の冷却管挿入孔部分の基端側の端部に至り、該端部にシールを介して嵌合し、前記内管の先端は、前記外管から更に先端側に突出している、鋳抜きピン。
The cast pin according to claim 1 or 2,
The cooling pipe inserted into the cooling pipe insertion hole comprises an outer pipe and an inner pipe,
The outer tube extends from the opening to the proximal end of the cooling tube insertion hole portion of the distal split member, and is fitted to the end through a seal. The distal end of the inner tube is connected to the outer tube. Cast pin that protrudes further from the tip .
請求項1乃至3のいずれか一つに記載の鋳抜きピンにおいて、
前記先端分割部材は、前記中間分割部材に対し、前記金型のキャビティ内に抜き取り可能に接続されている、鋳抜きピン。
The cast pin according to any one of claims 1 to 3,
The tip split member is a cast pin that is detachably connected to the intermediate split member in a cavity of the mold.
請求項4に記載の鋳抜きピンにおいて、
前記先端分割部材には、前記中間分割部材から取り外すための工具用の係合部が形成されている、鋳抜きピン。
The cast pin according to claim 4,
A cast pin in which an engagement portion for a tool to be removed from the intermediate split member is formed on the tip split member .
請求項1に記載の鋳抜きピンにおいて、
前記先端分割部材と前記中間分割部材と前記基端分割部材とは、互いに溶接により接続されている、鋳抜きピン。
The cast pin according to claim 1,
The tip split member, the intermediate split member, and the base end split member are cast pins that are connected to each other by welding.
JP2011286380A 2011-12-27 2011-12-27 Core pin Expired - Fee Related JP5021840B1 (en)

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Publication number Priority date Publication date Assignee Title
EP3269470A1 (en) * 2016-07-15 2018-01-17 Rolls-Royce plc Die for molding a core
CN111266548A (en) * 2020-03-11 2020-06-12 广汽本田汽车有限公司 Cast pin for oil return hole of engine cylinder body

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KR200476607Y1 (en) 2013-11-04 2015-03-18 (주)아모레퍼시픽 A Mold Unit Having Union Pipe Possible Length Control
JP6266326B2 (en) * 2013-12-06 2018-01-24 株式会社ケーヒン Casting die apparatus and casting method
JP5685340B1 (en) * 2014-09-18 2015-03-18 愛知機械工業株式会社 Casting pin, casting pin apparatus, and casting apparatus provided with the same

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JP2000141010A (en) * 1998-11-10 2000-05-23 Ahresty Corp Cooling tube for die

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JPH0234266A (en) * 1988-07-22 1990-02-05 Honda Motor Co Ltd Pin for hole as cast
JPH0929416A (en) * 1995-07-25 1997-02-04 Yoneya Seisakusho:Kk Method of cooling molten metal for die and device therefor and molten metal cooling pin for die
JP2000141010A (en) * 1998-11-10 2000-05-23 Ahresty Corp Cooling tube for die

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3269470A1 (en) * 2016-07-15 2018-01-17 Rolls-Royce plc Die for molding a core
US10486225B2 (en) 2016-07-15 2019-11-26 Rolls-Royce Plc Method and apparatus for particle injection moulding
CN111266548A (en) * 2020-03-11 2020-06-12 广汽本田汽车有限公司 Cast pin for oil return hole of engine cylinder body
CN111266548B (en) * 2020-03-11 2020-12-08 广汽本田汽车有限公司 Oil return hole casting pin for engine cylinder body mold
WO2021180058A1 (en) * 2020-03-11 2021-09-16 广汽本田汽车有限公司 Oil return hole cast pin for engine cylinder block mold

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