JP2501410Y2 - Core pin for mold - Google Patents
Core pin for moldInfo
- Publication number
- JP2501410Y2 JP2501410Y2 JP1988153914U JP15391488U JP2501410Y2 JP 2501410 Y2 JP2501410 Y2 JP 2501410Y2 JP 1988153914 U JP1988153914 U JP 1988153914U JP 15391488 U JP15391488 U JP 15391488U JP 2501410 Y2 JP2501410 Y2 JP 2501410Y2
- Authority
- JP
- Japan
- Prior art keywords
- product forming
- mold
- mounting hole
- groove
- core 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.)
- Expired - Lifetime
Links
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
Description
【考案の詳細な説明】 〈産業上の利用分野〉 本考案は、ダイカスト鋳造等において鋳造製品に所要
の穴等を形成するべく金型のキャビティ面に植設状に突
設される金型用中子ピンに関するものである。[Detailed Description of the Invention] <Industrial field of application> The present invention is for a die that is provided in a protruding manner in the cavity surface of the die so as to form required holes in a casting product in die casting. It is about core pins.
〈従来の技術〉 この種金型用中子ピンでは、キャビティ内に充填され
た溶湯の凝固収縮により、キャビティ面から突出してい
る製品形成部が、その軸方向と直交する方向に作用する
曲げ応力の影響を繰り返し受けることになる。そしてそ
の曲げ応力は、挿着部と製品形成部の境界部分、すなわ
ち製品形成部の根元部分に集中して掛るため、製品形成
部の根元部分が金属疲労をおこし、中子ピンが製品形成
部の根元部分から折れやすい不具合があった。<Prior art> In this core pin for mold die, due to solidification shrinkage of the molten metal filled in the cavity, the product forming portion protruding from the cavity surface is subjected to bending stress acting in a direction orthogonal to its axial direction. Will be repeatedly affected by. Since the bending stress is concentrated on the boundary between the insertion part and the product forming part, that is, the root part of the product forming part, the root part of the product forming part causes metal fatigue, and the core pin is attached to the product forming part. There was a problem that it was easy to break from the root part of.
〈考案が解決しようとする課題〉 本考案はこの様な従来の不具合に鑑みてなされたもの
であり、金型のキャビティ面から突出している製品形成
部を撓みやすくする事によって、溶湯の凝固収縮に伴う
曲げ応力の影響を繰り返し受けても、長期に亘って折れ
る惧れのない金型用中子ピンを提供せんとするものであ
る。<Problems to be Solved by the Invention> The present invention has been made in view of such a conventional problem, and the solidification shrinkage of the molten metal is made by making the product forming portion protruding from the cavity surface of the mold easily bend. It is intended to provide a core pin for a mold that is not likely to be broken for a long period of time even if it is repeatedly affected by bending stress due to.
〈課題を解決するための手段〉 斯る目的を達成する本考案の金型用中子ピンは、金型
のピン取付孔内に挿着され前記ピン取付孔の内径とほぼ
等しい外径部分をもつ挿着部と、金型のキャビティ面か
ら突出させる製品形成部とからなり、前記挿着部におけ
る製品形成部寄りの外周部分に周方向に凹溝を形成する
と共に、前記挿着部における上記凹溝から前記製品形成
部までの部分の外径を他の挿着部の外径より少し小径に
形成して当該部分の外周面とピン取付孔内周面との間に
クリアランスを形成せしめた事を特徴としたものであ
る。<Means for Solving the Problems> A mold core pin of the present invention for achieving the above object has an outer diameter portion which is inserted into a pin mounting hole of a mold and is approximately equal to an inner diameter of the pin mounting hole. And a product forming part projecting from the cavity surface of the mold, forming a groove in the outer peripheral portion of the inserting part near the product forming part in the circumferential direction, and The outer diameter of the portion from the groove to the product forming portion was formed to be slightly smaller than the outer diameter of the other insertion portion to form a clearance between the outer peripheral surface of the portion and the inner peripheral surface of the pin mounting hole. It is characterized by things.
〈実施例〉 以下、本考案実施の一例を図面に基づいて説明する。<Embodiment> An embodiment of the present invention will be described below with reference to the drawings.
図中、Ａは本考案に係る金型用中子ピンを示し、Ｂは
この金型用中子ピンＡを装着する鋳造用金型を示す。In the drawings, A indicates a mold core pin according to the present invention, and B indicates a mold for casting on which the mold core pin A is mounted.
本考案に係る金型用中子ピンＡは、金型Ｂのキャビテ
ィ面B1から背面に向かって穿設されたピン取付孔１内に
挿着支持されそのピン取付孔１の内径とほぼ等しい外径
部分をもつ挿着部A1と、この挿着部A1の軸径とほぼ同径
に形成され金型のキャビティ面B1から突出させる製品形
成部A2とを同軸状同一体に形成してなる。The mold core pin A according to the present invention is inserted and supported in a pin mounting hole 1 bored from the cavity surface B 1 of the mold B toward the back surface, and is substantially equal to the inner diameter of the pin mounting hole 1. The insertion part A 1 having an outer diameter part and the product forming part A 2 formed to have a diameter substantially the same as the shaft diameter of the insertion part A 1 and protruding from the cavity surface B 1 of the mold are formed into the same coaxial body. Formed.
そして、金型Ｂのピン取付孔１内に挿着される挿着部
A1の先端側、すなわち挿着部A1における製品形成部A2寄
りの外周部分に、周方向に凹溝２を形成すると共に、そ
の凹溝２から製品形成部A2までの部分A3の外径を他の挿
着部A1の外径より少し小径に形成して当該部分A3の外周
面とピン取付孔１の内周面との間にクリアランス３を形
成せしめる。Then, the insertion portion inserted into the pin attachment hole 1 of the mold B
A 1 of the distal end side, i.e. the outer peripheral portion of the product forming section A 2 near the inserting portion A 1, to form the groove 2 in the circumferential direction, part A 3 from the groove 2 until product formation section A 2 The outer diameter of the above is formed to be slightly smaller than the outer diameter of the other insertion portion A 1 , and a clearance 3 is formed between the outer peripheral surface of the portion A 3 and the inner peripheral surface of the pin mounting hole 1.
凹溝２は、金型Ｂのキャビティ内に充填された溶湯の
凝固収縮によって製品形成部A2が曲げ応力をうけた際に
製品形成伏せA2の根元部分に掛かる曲げ応力を減少させ
るためのものであり、挿着部A1の製品形成部A2寄りの外
周部分、詳しくはピン取付孔１内にあって金型キャビテ
ィ面B1近傍に位置した部分の外周部分に、周方向に１個
ないし複数個を形成する。Groove 2, the molten metal filled in the cavity of the mold B solidification shrinkage to reduce the applied bending stress when subjected to bending stress product forming portions A 2 at the root portion of the product formed prone A 2 by In the outer peripheral portion of the insertion portion A 1 near the product forming portion A 2 , more specifically, in the outer peripheral portion of the portion located in the pin mounting hole 1 and near the mold cavity surface B 1, there is a circumferential direction of 1 Form one or more.
即ち、第１図及び第２図に示した第１実施例のもの
は、ピン取付孔１内に位置した挿着部A1の製品形成部A2
寄りに複数個（３個）の凹溝２を周方向に沿ってリング
状に同一巾、同一間隔でもって形成すると共に、各凹溝
２の深さを、製品形成部A2に近いものほど漸次深く形成
し、また第３図に示した第２実施例のものは、巾広状の
凹溝２を１つ形成せしめたものである。尚、上記第１実
施例において、各凹溝２の深さを同一に形成すること、
及び各凹溝２の巾や間隔を変えて形成することは自由で
ある。That is, in the first embodiment shown in FIGS. 1 and 2, the product forming portion A 2 of the insertion portion A 1 located in the pin mounting hole 1
A plurality of (three) concave grooves 2 are formed in a ring shape along the circumferential direction with the same width and the same interval, and the depth of each concave groove 2 is closer to the product forming portion A 2. In the second embodiment shown in FIG. 3 which is formed gradually deeper, one wide groove 2 is formed. In addition, in the above-mentioned first embodiment, the depth of each concave groove 2 is formed to be the same,
Also, it is free to form the concave grooves 2 by changing the width and the interval thereof.
而して、金型のキャビティ内に溶湯を充填して製品を
鋳造すると、キャビティ内に充填された溶湯の凝固収縮
に伴う曲げ応力が製品形成部A2に掛る。この時、製品形
成部A2と一体的に挿着部A1の部分A3がクリアランス３の
範囲でもって動くので、本来なら製品形成部A2の根元部
分に集中する曲げ応力が、凹溝２の部分へ移動して減少
する。Thus, when the molten metal is filled in the cavity of the mold to cast a product, bending stress is applied to the product forming portion A 2 due to solidification shrinkage of the molten metal filled in the cavity. At this time, since the portion A 3 of the insertion portion A 1 moves integrally with the product forming portion A 2 within the range of the clearance 3, the bending stress that is originally concentrated at the base portion of the product forming portion A 2 is the concave groove. Move to part 2 and decrease.
即ち、溶湯の凝固収縮に伴う製品形成部A2の撓み量δ
は一定であるから、製品形成部A2の根元近くの部分A3が
クリアランス３の範囲でもって自由に動くことによっ
て、最大曲げ応力を受ける位置が製品形成部A2の根元部
分からその奥の凹溝２部分へ移動し、製品形成部A2の長
さＬが疑似的に長くなったと同じこととなるので、その
分最大曲げ応力が小さくなって製品形成部A2が撓みやす
くなり、加えて凹溝２の存在によって製品形成部A2が一
層のこと撓みやすくなるものである。また、挿着部A1の
部分A3がピン取付孔１の内周面に掛った場合でも、挿着
部A1の部分A3を支点にして凹溝２の部分が曲がるので、
製品形成部A2に掛る最大曲げ応力は小さくなる。That is, the amount of deflection δ of the product forming portion A 2 due to the solidification shrinkage of the molten metal
Is constant, the part A 3 near the root of the product forming part A 2 moves freely within the clearance 3 so that the position where the maximum bending stress is applied is from the base part of the product forming part A 2 to the back. This is the same as when the product forming portion A 2 is moved to the recessed groove 2 portion and the length L of the product forming portion A 2 is artificially lengthened. Therefore, the maximum bending stress is reduced accordingly, and the product forming portion A 2 is easily bent. As a result of the presence of the concave groove 2, the product forming portion A 2 is more easily bent. Further, even when the portion A 3 of the insertion portion A 1 is applied to the inner peripheral surface of the pin mounting holes 1, since the portion of the groove 2 bends by a portion A 3 of the insertion portion A 1 as a fulcrum,
The maximum bending stress applied to the product forming part A 2 becomes small.
〈考案の効果〉 本考案の金型用中子ピンは斯様に構成したので、キャ
ビティ内に充填された溶湯の凝固収縮に伴う曲げ応力が
製品形成部に掛かった際に、本来なら製品形成部の根元
部分に集中する最大曲げ応力が、製品形成部の根元近く
に形成せしめたクリアランスの存在によって凹溝の部分
へ移動して減少するため製品形成部が撓みやすくなり、
同時に、凹溝の存在により製品形成部が一層のこと撓み
やすくなる。その結果、製品形成部が金型のキャビティ
内に充填された溶湯の凝固収縮に伴う曲げ応力の影響を
繰り返し受けても、その根元部分が金属疲労を起こすこ
とが少なく、長期に亘って中子ピンが製品形成部の根元
部分から折れる惧れがなくなる。<Effects of the Invention> Since the core pin for a mold of the present invention is configured in this way, when the bending stress due to the solidification shrinkage of the molten metal filled in the cavity is applied to the product forming part, the product forming is originally performed. The maximum bending stress concentrated at the root of the part moves to the groove portion due to the existence of the clearance formed near the root of the product forming part and decreases, making the product forming part easier to bend,
At the same time, the presence of the groove makes it easier for the product forming portion to bend. As a result, even if the product forming part is repeatedly affected by the bending stress caused by the solidification shrinkage of the molten metal filled in the cavity of the mold, its root portion is less likely to cause metal fatigue and the core is There is no fear that the pin will break from the root of the product forming part.
尚、下記表１に、本考案に係る中子ピンと従来の中子
ピンとにおける実操業上の比較データ（金型に装着した
中子ピンが折れるまでの鋳造回数）を示す。In addition, Table 1 below shows comparative data on the actual operation of the core pin according to the present invention and the conventional core pin (the number of castings until the core pin attached to the mold is broken).
第１図は本考案の第１実施例を示す金型に組込んだ状態
の断面図、第２図は第１図の（２）−（２）線に沿う断
面図、第３図は本考案の第２実施例を示す金型に組込ん
だ状態の断面図である。 図中 A:中子ピン、A1：挿着部 A2：製品形成部、B:金型 B1：キャビティ面、1:ピン取付孔 2:凹溝、3:クリアランスFIG. 1 is a sectional view showing the first embodiment of the present invention assembled in a mold, FIG. 2 is a sectional view taken along line (2)-(2) of FIG. 1, and FIG. It is sectional drawing of the state which built in the metal mold | die which shows 2nd Example of a device. In the figure A: Core pin, A 1 : Insertion part A 2 : Product forming part, B: Mold B 1 : Cavity surface, 1: Pin mounting hole 2: Recessed groove, 3: Clearance
Claims (1)
れ前記ピン取付孔（１）の内径とほぼ等しい外径部分を
もつ挿着部（A1）と、金型（Ｂ）のキャビティ面（B1）
から突出させる製品形成部（A2）とからなり、前記挿着
部（A1）における製品形成部（A2）寄りの外周部分に周
方向に凹溝（２）を形成すると共に、前記挿着部（A1）
における上記凹溝（２）から前記製品形成部（A2）まで
の部分（A3）の外径を他の挿着部（A1）の外径より少し
小径に形成して当該部分（A3）の外周面とピン取付孔
（１）の内周面との間にクリアランス（３）を形成せし
めた事を特徴とする金型用中子ピン。1. An insertion part (A 1 ) which is inserted into a pin mounting hole (1) of a mold (B) and has an outer diameter portion substantially equal to the inner diameter of the pin mounting hole (1), and a mold. Cavity surface of (B) (B 1 )
Becomes because the product forming portion that protrudes from (A 2), to form a groove (2) at the periphery of the product forming portion (A 2) close to the circumferential direction of the insertion portion (A 1), the interpolation Dressing area (A 1 )
The product forming portion of the groove (2) in (A 2) to the portion (A 3) slightly than the outer diameter to a smaller diameter that portion of the outer diameter of the other insertion portion (A 1) of (A A core pin for a die, characterized in that a clearance (3) is formed between the outer peripheral surface of (3) and the inner peripheral surface of the pin mounting hole (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988153914U JP2501410Y2 (en) | 1988-11-25 | 1988-11-25 | Core pin for mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988153914U JP2501410Y2 (en) | 1988-11-25 | 1988-11-25 | Core pin for mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0276659U JPH0276659U (en) | 1990-06-12 |
| JP2501410Y2 true JP2501410Y2 (en) | 1996-06-19 |
Family
ID=31430171
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988153914U Expired - Lifetime JP2501410Y2 (en) | 1988-11-25 | 1988-11-25 | Core pin for mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2501410Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5780390B2 (en) * | 2011-05-27 | 2015-09-16 | トヨタ自動車株式会社 | Die casting pin |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63281760A (en) * | 1987-05-13 | 1988-11-18 | Honda Motor Co Ltd | Production of cylinder head for internal combustion engine |
| JPH065009Y2 (en) * | 1987-05-28 | 1994-02-09 | 株式会社アーレスティ | Core pin for mold |
-
1988
- 1988-11-25 JP JP1988153914U patent/JP2501410Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0276659U (en) | 1990-06-12 |
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