JP2002126864A - Core pin for die - Google Patents
Core pin for dieInfo
- Publication number
- JP2002126864A JP2002126864A JP2000323004A JP2000323004A JP2002126864A JP 2002126864 A JP2002126864 A JP 2002126864A JP 2000323004 A JP2000323004 A JP 2000323004A JP 2000323004 A JP2000323004 A JP 2000323004A JP 2002126864 A JP2002126864 A JP 2002126864A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- fulcrum
- core pin
- handle
- pin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ダイカスト鋳込み
に使用される金型に装着され、金型のキャビティ面から
成形部が突出する状態で用いられる金型用中子ピンに関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core pin for a mold which is mounted on a mold used for die casting and is used in a state where a molding portion protrudes from a cavity surface of the mold.
【０００２】[0002]
【従来の技術】ダイカスト鋳込みに使用される金型用中
子ピンは、金型に保持させる柄部と金型のキャビティに
突入させて成形機能を果たす成形部とから構成されてい
る。この中で、成形部が柄部より小径に構成されている
ものは、段付中子ピンとも称されている。この種の金型
用中子ピンは、成形部が金型のキャビティに充填される
溶湯の射出圧力や流動エネルギーさらには凝固収縮作用
を繰り返し受け、成形部の根元部分に応力が集中して負
荷され、根元部分に疲労破壊や衝撃破壊が起き易い。金
型用中子ピンのこうした問題点は、従来、これを解決す
るためのいくつかの工夫が提唱されている。2. Description of the Related Art A mold core pin used for die casting includes a handle portion to be held by the mold and a molding portion which enters a cavity of the mold to perform a molding function. Among them, the one in which the formed portion has a smaller diameter than the handle portion is also referred to as a stepped core pin. In this type of mold core pin, the molding part repeatedly receives injection pressure, flow energy and solidification shrinkage action of the molten metal filled in the cavity of the mold, and stress is concentrated on the root part of the molding part and load is applied. As a result, fatigue and impact fractures are likely to occur at the root. In order to solve such a problem of the core pin for a mold, some devices for solving the problem have been proposed.
【０００３】例えば、実開昭６３―１８９４６２号公報
には、成形部に続く柄部に軸方向に間隔をおいて複数本
の溝を設け、成形部の根元に掛かる応力集中を複数本の
溝により緩和しようとする技術が示されている。また、
実公平７―２１３２号公報には、柄部の成形部側に他の
部分より軸径の小さい首部を設け、首部と成形部との境
に金型に対してクリアランスを有する溶湯封止部を設
け、成形部を撓み易くして応力を緩和しようとする技術
が示されている。そして、特開平３―５０５８号公報に
は、柄部の成形部側に金型に拘束されない遊挿部を設
け、成形部の全長を実質的に長くして成形部に掛かる曲
げ応力を小さくしようとする技術が示されている。For example, Japanese Utility Model Laid-Open Publication No. 63-189462 discloses that a plurality of grooves are provided at intervals in the axial direction in a handle portion following a molding portion, and the concentration of stress applied to the root of the molding portion is reduced by a plurality of grooves. Indicate techniques to be alleviated. Also,
In Japanese Utility Model Publication No. 7-2132, a neck portion having a smaller shaft diameter than the other portion is provided on a molding portion side of a handle portion, and a molten metal sealing portion having a clearance with respect to a mold at a boundary between the neck portion and the molding portion. There is disclosed a technique for reducing the stress by making the formed portion easily bendable. Japanese Unexamined Patent Publication (Kokai) No. 3-5058 discloses a method in which a free insertion portion which is not restrained by a mold is provided on a molding portion side of a handle portion, and the overall length of the molding portion is substantially lengthened to reduce bending stress applied to the molding portion. Is shown.
【０００４】[0004]
【発明が解決しようとする課題】しかし、上記のような
従来の金型用中子ピンに関する応力緩和策の工夫は、い
ずれも基本的には成形部の自由度を上げ撓み易くして応
力の緩和を図るものであるが、柄部に加工の面倒な首部
や遊挿部を構成しなければならないうえ、成形部のキャ
ビティに突入する長さの長短に対する応力緩和について
の対応性に欠けるといった問題点がある。However, any of the above-described measures for relaxing the stress on the core pin for a mold as described above basically increases the degree of freedom of the molded portion and makes it easier to bend to reduce the stress. Although it is intended to ease the problem, it is necessary to construct a troublesome neck and loose insertion part on the handle, and there is a lack of response to stress relaxation for the length of the molded part entering the cavity There is a point.
【０００５】そこで本発明は、係る従来の問題点を解決
するためになされたものであって、その課題は、金型用
中子ピンの疲労破壊や衝撃破壊をより容易に低減させ得
る金型用中子ピンを提供することにある。The present invention has been made in order to solve the above-mentioned conventional problems, and an object of the present invention is to provide a mold capable of more easily reducing the fatigue fracture and impact fracture of a mold core pin. An object of the present invention is to provide a core pin.
【０００６】[0006]
【課題を解決するための手段】前記課題を達成するため
に請求項１の発明は、金型のピン取付孔に挿通支持され
る柄部の一端側に、該金型のキャビティ内に突入し中子
をなす成形部を有し、その成形部が前記柄部より小径に
構成されている金型用中子ピンであって、その柄部の中
間部に前記ピン取付孔の内面に当る支点部を設け、この
支点部から前記成形部までの長さで撓みうるようにした
手段を採用する。According to a first aspect of the present invention, there is provided a mold for projecting into a cavity of a mold at one end of a handle portion inserted and supported in a pin mounting hole of the mold. A mold core pin having a molded part forming a core, the molded part having a smaller diameter than the handle, and a fulcrum contacting an inner surface of the pin mounting hole at an intermediate part of the handle. A means is provided which is provided with a portion and is made to be able to be bent by a length from the fulcrum portion to the molded portion.
【０００７】上記手段を採用することにより、柄部に支
点部を構成するだけで、成形部に溶湯の射出圧力や流動
エネルギー、凝固収縮作用に対するしなやかさを備えさ
せることができるようになる。[0007] By employing the above means, it is possible to provide the molding portion with flexibility for injection pressure, flow energy and solidification shrinkage action of the molten metal only by forming a fulcrum portion on the handle portion.
【０００８】前記課題を達成するために請求項２の発明
は、請求項１に係る前記手段において、成形部の長さに
応じて柄部を按分するような位置に支点部を設けた手段
を採用する。In order to achieve the above object, the invention according to claim 2 is the means according to claim 1, wherein a fulcrum portion is provided at a position where the handle portion is apportioned according to the length of the molded portion. adopt.
【０００９】上記手段を採用することにより、請求項１
に係る前記機能とともに成形部の長短に応じたしなやか
さを備えさせることができるようになる。By adopting the above-mentioned means, a first aspect is provided.
In addition to the above-mentioned function, it is possible to provide flexibility according to the length of the molded portion.
【００１０】前記課題を達成するために請求項３の発明
は、請求項１又は請求項２に係る前記手段において、柄
部の一部を局部的に大径に構成し、その大径部分を支点
部とした手段を採用する。In order to achieve the above object, the invention according to claim 3 is the means according to claim 1 or 2, wherein a part of the handle portion is locally formed to have a large diameter, and the large diameter portion is formed. A fulcrum is used.
【００１１】上記手段を採用することにより、請求項１
又は請求項２に係る前記機能とともに支点部を簡単に形
成することができるようになる。[0011] By adopting the above means, a first aspect is provided.
Alternatively, the fulcrum can be easily formed together with the function according to the second aspect.
【００１２】前記課題を達成するために請求項４の発明
は、請求項１又は請求項２に係る前記手段において、柄
部を、胴膨れ形態に構成してその最大径部分を支点部と
した手段を採用する。According to a fourth aspect of the present invention, the handle according to the first or second aspect is configured such that the handle portion is formed in a swollen shape, and a maximum diameter portion thereof is used as a fulcrum portion. Adopt means.
【００１３】上記手段を採用することにより、請求項１
又は請求項２に係る前記機能とともに柄部の強度を確保
し易くなる。[0013] By adopting the above means, a first aspect is provided.
Alternatively, it is easy to secure the strength of the handle together with the function according to the second aspect.
【００１４】前記課題を達成するために請求項５の発明
は、請求項１〜請求項４までのいずれかに係る前記手段
において、支点部に、ガス抜き構造を設けた手段を採用
する。In order to achieve the above object, a fifth aspect of the present invention adopts the means according to any one of the first to fourth aspects, wherein the fulcrum portion is provided with a gas vent structure.
【００１５】上記手段を採用することにより、請求項１
〜請求項４までのいずれかにに係る前記機能とともに鋳
込み時にキャビティ内のガスをガス抜き構造により抜く
ことができるようになる。[0015] By adopting the above means, a first aspect of the present invention is provided.
In addition to the function according to any one of the first to fourth aspects, the gas in the cavity can be released by the gas release structure during casting.
【００１６】[0016]
【発明の実施の形態】図１〜図４によって示す本実施の
形態は、ダイカスト鋳込みに使用される段付きの金型用
中子ピンに関するものである。この金型用中子ピンは、
図１に示すように金型１に装着され、金型１のキャビテ
ィ面２Ａから先端側の成形部３がキャビティ２内に突入
する形態で用いられる。成形部３は適当な抜き勾配を持
つ小径部として大径の柄部４の一端側に段差をもって一
体に形成されている。柄部４は、金型１に設けられたピ
ン取付孔５に挿通支持され、その反成形部側端には成形
部３の金型１に対する位置を決める半径方向に張り出す
鍔６が設けられ、金型１の背面に配置した背板７により
固定される。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present embodiment shown in FIGS. 1 to 4 relates to a stepped core pin for a mold used for die casting. This mold core pin
As shown in FIG. 1, it is mounted on a mold 1, and is used in a form in which a molding part 3 on the tip side from a cavity surface 2 </ b> A of the mold 1 enters the cavity 2. The forming part 3 is formed integrally with one end side of the large diameter handle part 4 as a small diameter part having an appropriate draft angle with a step. The handle 4 is inserted into and supported by a pin mounting hole 5 provided in the mold 1, and a flange 6 that protrudes in a radial direction for determining a position of the mold 3 with respect to the mold 1 is provided at an end opposite to the mold. Is fixed by a back plate 7 arranged on the back surface of the mold 1.
【００１７】成形部３を支える柄部４の中間部には、図
１及び図２に示すように金型１のピン取付孔５の内面に
略線接触に近いかたちで当る支点部９が半径方向に環状
に膨出するＲ面付きの膨出部１０として形成されてい
る。金型１のピン取付孔５は、キャビティ側は小径で背
板７側は大径の段付き孔として形成され、金型用中子ピ
ンの柄部４の支点部９より元側が大径部に、支点部９よ
り先側の成形部３側が小径部に嵌合するように設定され
ている（図１参照）。ピン取付孔５の小径部と支点部９
より先側の柄部４とは０．０２ｍｍ〜０．０５ｍｍ程の
クリアランスを持つ嵌め合い関係におかれる。支点部９
は、ピン取付孔５の大径部の範囲内においてそのＲ面が
内面に当り、これにより装着状態の金型用中子ピンは、
支点部９から成形部３の先端までの長さで０．０２ｍｍ
〜０．０５ｍｍ程の範囲において撓むことができる。At a middle portion of the handle portion 4 for supporting the molded portion 3, a fulcrum portion 9 which comes into contact with the inner surface of the pin mounting hole 5 of the mold 1 in a shape almost in line contact as shown in FIGS. It is formed as a bulging portion 10 with an R-plane bulging annularly in the direction. The pin mounting hole 5 of the mold 1 is formed as a stepped hole having a small diameter on the cavity side and a large diameter on the back plate 7 side, and a large diameter portion on the base side of the fulcrum 9 of the handle 4 of the core pin for the mold. In addition, it is set so that the molding part 3 side before the fulcrum part 9 is fitted to the small diameter part (see FIG. 1). Small diameter portion and fulcrum portion 9 of pin mounting hole 5
The handle portion 4 on the further front side is in a fitting relationship with a clearance of about 0.02 mm to 0.05 mm. Fulcrum 9
In the range of the large diameter portion of the pin mounting hole 5, the R surface thereof hits the inner surface.
0.02 mm in length from the fulcrum 9 to the tip of the molded part 3
It can bend in the range of about 0.05 mm.
【００１８】支点部９にはその外周部にガス抜き構造と
しての溝１１が周方向に間隔をおいて縦向きに複数本設
けられ、溝１１により鋳込み時にキャビティ内のガスを
速やかに外部に抜出し、鋳巣ができることを防止する。
ガス抜き構造としては支点部９を軸方向に貫通する孔で
構成することもできる。支点部９は金型用中子ピンの柄
部４における実質的な支持部であり、柄部４におけるそ
の位置は成形部３側の撓み性を左右する重要な意味を持
つ。即ち、支点部９が柄部４の元側に位置するほど成形
部３側は撓み易くなり、金型１のキャビティ２に充填さ
れる溶湯の射出圧力や流動エネルギー、凝固収縮作用に
よる応力の集中をしなやかさにより回避できるが、成形
部３を支持する保持機能は低下する。成形部３の長さに
応じて支点部９により柄部４の長さを元側と先端側とに
按分するように支点部９の位置を決定すると、応力の集
中が回避できしかも成形部３の保持機能も損なわれな
い。The fulcrum 9 is provided with a plurality of vertically extending grooves 11 as a gas release structure on the outer periphery thereof at intervals in the circumferential direction. To prevent the formation of cavities.
The gas release structure may be constituted by a hole that penetrates the fulcrum 9 in the axial direction. The fulcrum portion 9 is a substantial support portion of the mold core pin in the handle portion 4, and its position in the handle portion 4 has an important meaning that affects the flexibility of the molding portion 3. That is, as the fulcrum portion 9 is located closer to the base side of the handle portion 4, the molding portion 3 is more easily bent, and the injection pressure and flow energy of the molten metal filled in the cavity 2 of the mold 1 and concentration of stress due to solidification shrinkage action. However, the holding function for supporting the molded portion 3 is reduced. If the position of the fulcrum portion 9 is determined by the fulcrum portion 9 according to the length of the molding portion 3 so that the length of the handle portion 4 is proportionally divided between the original side and the distal end side, concentration of stress can be avoided and The retention function is not impaired.
【００１９】具体的には、成形部３の長さが長い場合に
は、長さに応じて支点部９を成形部３に近い側の位置に
し、成形部３の長さが短い場合には、それに応じて支点
部９を成形部３から遠退く位置にする。支点部９の位置
をこのような基準によって設定することにより、鋳込み
に伴う応力の集中回避と保持機能の確保が両立すること
になり、疲労破壊や衝撃破壊を少なくすることができ、
成形部３の長さに応じて撓み性を持たせることができ
る。この金型用中子ピンは切削加工により小径の首部を
形成し撓み性を備えさせる従来の中子ピンとは異なり、
膨出部１０による支点部９を柄部４に形成するものであ
るので、柄部４の強度低下を招くこともなく、加工も容
易で製造し易い。Specifically, when the length of the molded portion 3 is long, the fulcrum portion 9 is set to a position closer to the molded portion 3 according to the length, and when the length of the molded portion 3 is short, Accordingly, the fulcrum 9 is moved to a position far away from the forming part 3. By setting the position of the fulcrum portion 9 based on such a standard, the avoidance of stress concentration due to the casting and the securing of the holding function can be achieved at the same time, and the fatigue fracture and the impact fracture can be reduced.
Flexibility can be provided according to the length of the molded portion 3. This mold core pin is different from the conventional core pin that forms a small diameter neck by cutting and has flexibility.
Since the fulcrum 9 formed by the bulging portion 10 is formed on the handle 4, the strength of the handle 4 is not reduced, and the processing is easy and the manufacturing is easy.
【００２０】支点部９については、柄部４を図３や図４
に示すように胴膨れ形態１２や紡錘形態１３にし、その
最大径部分を支点部９とすることもでき、こうした構造
を採用することにより段部への応力の集中回避とともに
強度の向上も達成することができる。As for the fulcrum 9, the handle 4 is connected to the fulcrum 9 shown in FIGS.
As shown in the figure, the bulging shape 12 and the spindle shape 13 can be used, and the maximum diameter portion can be used as the fulcrum portion 9. By adopting such a structure, the concentration of stress on the step portion can be avoided and the strength can be improved. be able to.
【００２１】本発明に係わる金型用中子ピンは、柄部４
に膨出部１０の支点部９を形成するため、冷却用水穴を
設ける場合の中子ピンに対しても支障を生じない。たと
えば、図５（Ａ）に示す中子ピン２０は、図５（Ｂ）の
冷却管２５を挿入するための水穴２１を有するが、支点
部９は柄部４に環状の膨出部１０として形成されている
ため、ピン本来の必要な材質強度は充分確保でき、かつ
支点部９により中子ピン２０の疲労破壊や衝撃破壊を低
減することができる。なお、図５（Ａ）において２２は
冷却管２５の取付け孔、図５（Ｂ）の２６は取付け孔２
２に対する挿着管部、２７は冷却管２５の吸排水部であ
る。The core pin for a mold according to the present invention has a handle 4
Since the fulcrum 9 of the bulging portion 10 is formed in the swelling portion, there is no problem even when the cooling water hole is provided. For example, the core pin 20 shown in FIG. 5A has a water hole 21 for inserting the cooling pipe 25 shown in FIG. As a result, the necessary material strength inherent in the pin can be sufficiently ensured, and the fulcrum 9 can reduce the fatigue fracture and the impact fracture of the core pin 20. In FIG. 5A, reference numeral 22 denotes a mounting hole for the cooling pipe 25, and reference numeral 26 in FIG.
Reference numeral 27 denotes an insertion tube portion for 2 and a suction / drain portion of the cooling tube 25.
【００２２】[0022]
【発明の効果】本発明によれば、柄部に支点部を構成す
るだけで、成形部に溶湯の射出圧力や流動エネルギー、
凝固収縮作用に対するしなやかさを備えさせることがで
き、疲労破壊や衝撃破壊を低減できる。According to the present invention, the injection pressure and flow energy of the molten metal,
It is possible to provide flexibility for coagulation and shrinkage, and to reduce fatigue fracture and impact fracture.
【図１】実施の形態の金型用中子ピンを装着状態で示す
一部破断正面図である。FIG. 1 is a partially broken front view showing a mold core pin according to an embodiment in a mounted state.
【図２】実施の形態の金型用中子ピンの正面図である。FIG. 2 is a front view of a core pin for a mold according to the embodiment.
【図３】実施の形態の他の金型用中子ピンを示す正面図
である。FIG. 3 is a front view showing another mold core pin according to the embodiment;
【図４】実施の形態のさらに他の金型用中子ピンの正面
図である。FIG. 4 is a front view of still another mold core pin according to the embodiment.
【図５】（Ａ）は実施の形態のさらなる他の金型用中子
ピンの断面図、（Ｂ）は挿入用冷却管の要部を示す全体
図である。FIG. 5A is a sectional view of still another mold core pin according to the embodiment, and FIG. 5B is an overall view showing a main part of an insertion cooling pipe.
１：金型 ２：キャビティ ２Ａ：キャビティ面 ３：成形部 ４：柄部 ５：ピン取付孔 ９：支点部 １０：膨出部 １１：溝 １２：胴膨れ形態 1: Mold 2: Cavity 2A: Cavity surface 3: Molded part 4: Handle part 5: Pin mounting hole 9: Support point part 10: Swelling part 11: Groove 12: Body swelling form
Claims (5)
の一端側に、該金型のキャビティ内に突入し中子をなす
成形部を有し、その成形部が前記柄部より小径に構成さ
れている金型用中子ピンであって、その柄部の中間部に
前記ピン取付孔の内面に当る支点部を設け、この支点部
から前記成形部までの長さで撓みうるようにしたことを
特徴とする金型用中子ピン。1. A mold having a molding part which protrudes into a cavity of the mold and forms a core at one end side of a mold part which is inserted and supported in a pin mounting hole of the mold. A core pin for a mold configured to have a small diameter, provided with a fulcrum at an intermediate portion of the handle portion, the fulcrum being in contact with the inner surface of the pin mounting hole, and capable of flexing with a length from the fulcrum to the molding portion. A core pin for a mold, characterized in that:
うな位置に支点部を設けたことを特徴とする請求項１に
記載の金型用中子ピン。2. The core pin for a mold according to claim 1, wherein a fulcrum portion is provided at a position where the handle portion is apportioned according to the length of the molding portion.
の大径部分を支点部としたことを特徴とする請求項１又
は請求項２に記載の金型用中子ピン。3. A core pin for a mold according to claim 1, wherein a part of the handle portion is locally formed to have a large diameter, and the large diameter portion is used as a fulcrum portion. .
部分を支点部としたことを特徴とする請求項１又は請求
項２に記載の金型用中子ピン。4. The core pin for a mold according to claim 1, wherein the handle portion is formed in a swollen shape, and a maximum diameter portion thereof is used as a fulcrum portion.
徴とする請求項１〜請求項４までのいずれかに記載の金
型用中子ピン。5. The core pin for a mold according to claim 1, wherein a degassing structure is provided at the fulcrum portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000323004A JP2002126864A (en) | 2000-10-23 | 2000-10-23 | Core pin for die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000323004A JP2002126864A (en) | 2000-10-23 | 2000-10-23 | Core pin for die |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002126864A true JP2002126864A (en) | 2002-05-08 |
Family
ID=18800775
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000323004A Pending JP2002126864A (en) | 2000-10-23 | 2000-10-23 | Core pin for die |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002126864A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010101123A1 (en) * | 2009-03-02 | 2010-09-10 | いすゞ自動車株式会社 | Casting device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01171908A (en) * | 1987-12-28 | 1989-07-06 | Toshiba Corp | Metal mold |
| JPH03126268U (en) * | 1990-03-31 | 1991-12-19 | ||
| JPH1085917A (en) * | 1996-09-09 | 1998-04-07 | Honda Motor Co Ltd | Pin as cast |
-
2000
- 2000-10-23 JP JP2000323004A patent/JP2002126864A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01171908A (en) * | 1987-12-28 | 1989-07-06 | Toshiba Corp | Metal mold |
| JPH03126268U (en) * | 1990-03-31 | 1991-12-19 | ||
| JPH1085917A (en) * | 1996-09-09 | 1998-04-07 | Honda Motor Co Ltd | Pin as cast |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010101123A1 (en) * | 2009-03-02 | 2010-09-10 | いすゞ自動車株式会社 | Casting device |
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