JPH08117958A - Die casting method - Google Patents
Die casting methodInfo
- Publication number
- JPH08117958A JPH08117958A JP25583694A JP25583694A JPH08117958A JP H08117958 A JPH08117958 A JP H08117958A JP 25583694 A JP25583694 A JP 25583694A JP 25583694 A JP25583694 A JP 25583694A JP H08117958 A JPH08117958 A JP H08117958A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- core pin
- hole
- peripheral surface
- inner peripheral
- 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
- Moulds For Moulding Plastics Or The Like (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、寸法精度を必要とす
る製品の孔について成形後の機械加工を省略することが
できるダイカスト鋳造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die casting method which can omit machining after forming a hole of a product requiring dimensional accuracy.
【０００２】[0002]
【従来の技術】従来のダイカスト鋳造方法においては、
図３に示すように、中子ピン５を取り付けた可動型３と
固定型２とからなる金型１を型締めしてこの両型２，３
間で形成されるキャビティ４に溶湯を注入する。次に、
図４に示すように型開きし、可動型３側にある製品９を
押出ピンにより可動型３から離間させて取り出す。2. Description of the Related Art In the conventional die casting method,
As shown in FIG. 3, a mold 1 composed of a movable mold 3 having a core pin 5 attached thereto and a fixed mold 2 is clamped, and both molds 2 and 3 are formed.
Molten metal is injected into the cavity 4 formed between the two. next,
As shown in FIG. 4, the mold is opened, and the product 9 on the side of the movable mold 3 is separated from the movable mold 3 by an extrusion pin and taken out.
【０００３】[0003]
【発明が解決しようとする課題】ところが、この従来の
ダイカスト鋳造方法では下記の欠点を有する。可動型３
側にある中子ピン５が製品９の孔１０に挿入されたまま
型開きされるので、外気にさらされた製品９が冷却収縮
して孔１０の内周面１０ａが中子ピン５に圧接される。
そのため、製品９を押出ピンにより押して製品９の孔１
０から中子ピン５を引き抜く場合、この孔１０の内周面
１０ａにかじりや焼付きが生じ易い。それを防止するた
めに、中子ピン５の抜け勾配を大きくしている（１〜２
度以上）。この抜け勾配が大き過ぎると、孔１０の内周
面１０ａが精度の低いはめあい公差となり、例えかじり
や焼付きを防止できたとしても、精度の高いはめあい公
差にするために成形後に機械加工を必要としていた。こ
のような、機械加工工程があると、製造コストが高くな
る問題があった。However, this conventional die casting method has the following drawbacks. Movable type 3
Since the core pin 5 on the side is opened while being inserted into the hole 10 of the product 9, the product 9 exposed to the outside air is cooled and contracted, and the inner peripheral surface 10a of the hole 10 is pressed against the core pin 5. To be done.
Therefore, the product 9 is pushed by the extrusion pin and the hole 1 of the product 9 is
When the core pin 5 is pulled out from 0, galling or seizure easily occurs on the inner peripheral surface 10 a of the hole 10. In order to prevent this, the escape angle of the core pin 5 is increased (1-2
Or more). If this draft angle is too large, the inner peripheral surface 10a of the hole 10 has a low-precision fitting tolerance. Even if it is possible to prevent galling and seizure, machining is required after molding in order to obtain a high-precision fitting tolerance. I was trying. Such a machining process has a problem of increasing the manufacturing cost.
【０００４】本発明は成形後の機械加工を省略して製造
コストを低くし得るダイカスト鋳造方法を提供すること
を目的としている。It is an object of the present invention to provide a die casting method which can reduce the manufacturing cost by omitting machining after molding.
【０００５】[0005]
【課題を解決するための手段】後記する実施例の図面
（図１，２）に示すように、本発明のダイカスト鋳造方
法においては、０度００分から０度２０分位の抜け勾配
を有する中子ピン（５）を取り付けた固定型（２）と、
この固定型（２）に対し開閉可能にした可動型（３）と
からなる金型（１）を型締めしてこの両型（２，３）間
で形成されるキャビティ（４）に溶湯を注入するととも
に、この金型（１）内の温度調節用流体通路（８）によ
り中子ピン（５）の表面温度を制御する。次に、前記金
型（１）を型開きして固定型（２）から可動型（３）を
離し、可動型（３）側にある製品（９）の孔（１０）か
ら固定型（２）側の中子ピン（５）を引き抜いてこの孔
（１０）の内周面（１０ａ）を開放する。その後、この
製品（９）を可動型（３）から取り出す。As shown in the drawings of the embodiments described later (FIGS. 1 and 2), the die casting method of the present invention has a draft of 0 ° 00 minutes to 0 ° 20 minutes. Fixed type (2) with child pin (5) attached,
A mold (1) consisting of a movable mold (3) that can be opened and closed with respect to the fixed mold (2) is clamped, and molten metal is poured into a cavity (4) formed between the molds (2, 3). While injecting, the surface temperature of the core pin (5) is controlled by the temperature adjusting fluid passage (8) in the mold (1). Next, the mold (1) is opened to separate the movable mold (3) from the fixed mold (2), and the fixed mold (2) is moved from the hole (10) of the product (9) on the movable mold (3) side. ) Side core pin (5) is pulled out to open the inner peripheral surface (10a) of this hole (10). Then, this product (9) is taken out from the movable mold (3).
【０００６】[0006]
【作用】図２の型開き状態で、製品（９）の孔（１０）
が外気にさらされて冷却収縮するが、型開き直後にこの
孔（１０）から中子ピン（５）が既に引き抜かれている
ため、この孔（１０）の内周面（１０ａ）が中子ピン
（５）から離れて開放され、この内周面（１０ａ）の内
径が冷却収縮により例え小さくなっても、中子ピン
（５）の引き抜き時にこの内周面（１０ａ）に生じ易い
かじりや焼付きはなくなる。中子ピン（５）の抜け勾配
を０度００分から０度２０分位にしたので、孔（１０）
の内周面（１０ａ）もこの抜け勾配に合わせて成形さ
れ、精度の高いはめあい公差を得る。この抜け勾配にし
た場合に心配なかじりや焼付きを確実に防止するため
に、温度調節用流体通路（８）を利用して金型（１）内
におけるキャビティ（４）の周辺温度や中子ピン（５）
の表面温度を制御している。Function: In the mold open state of FIG. 2, the hole (10) of the product (9)
Is exposed to the outside air and shrinks by cooling, but since the core pin (5) has already been pulled out from this hole (10) immediately after opening the mold, the inner peripheral surface (10a) of this hole (10) has a core. Even if the inner peripheral surface (10a) is released away from the pin (5) and the inner diameter of the inner peripheral surface (10a) becomes small due to cooling contraction, the galling or the like easily occurs on the inner peripheral surface (10a) when the core pin (5) is pulled out. No image sticking. Since the draft angle of the core pin (5) was changed from 0 degrees 00 minutes to 0 degrees 20 minutes, the holes (10)
The inner peripheral surface (10a) is also formed in accordance with this draft, and a highly accurate fit tolerance is obtained. In order to surely prevent the risk of galling and seizure when this draft angle is set, the temperature around the cavity (4) in the mold (1) and the core are utilized by using the temperature control fluid passage (8). Pin (5)
It controls the surface temperature of.
【０００７】[0007]
【実施例】以下、本発明の一実施例にかかるダイカスト
鋳造方法を図１及び図２を参照して説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A die casting method according to an embodiment of the present invention will be described below with reference to FIGS.
【０００８】図１には型締めした金型１の一部を、図２
には型開きした金型１の一部をそれぞれ概略的に示す。
型締め状態で固定型２と可動型３との間にキャビティ４
が形成され、固定型２側に設けられた中子ピン５がキャ
ビティ４内に挿入されている。固定型２内に型開き用押
出ピン６が取り付けられ、可動型３内に製品取出用押出
ピン７が取り付けられている。固定型２及び可動型３内
にはキャビティ４の周辺で温度調節用流体通路８が貫通
されている。なお、図示しないが、金型１にはスプー
ル、ランナー、ゲートなどが設けられている。FIG. 1 shows a part of the mold 1 which has been clamped.
1 schematically shows a part of the mold 1 that has been opened.
In the mold clamped state, a cavity 4 is provided between the fixed mold 2 and the movable mold 3.
And the core pin 5 provided on the fixed mold 2 side is inserted into the cavity 4. A mold opening push-out pin 6 is mounted in the fixed mold 2, and a product take-out push-out pin 7 is mounted in the movable mold 3. In the fixed mold 2 and the movable mold 3, a temperature adjusting fluid passage 8 is penetrated around the cavity 4. Although not shown, the mold 1 is provided with a spool, a runner, a gate, and the like.
【０００９】まず、成形手順を簡単に述べる。図１の型
締め状態でキャビティ４に溶湯（例えばアルミニウム合
金）を注入すると、キャビティ４内で溶湯が凝固して製
品９が成形される。その後、図２に示すように型開きす
ると、製品９が可動型３とともに移動して固定型２から
離れる。このとき、型開き用押出ピン６が突出して製品
９を押し出し、その型離れを助ける。次に、製品取出用
押出ピン７が突出して製品９が可動型３から離れる。製
品９の取出し後、離型剤をスプレーする。First, the molding procedure will be briefly described. When a molten metal (for example, an aluminum alloy) is injected into the cavity 4 in the mold clamped state of FIG. 1, the molten metal is solidified in the cavity 4 to form a product 9. After that, when the mold is opened as shown in FIG. 2, the product 9 moves together with the movable mold 3 and separates from the fixed mold 2. At this time, the mold-opening push-out pin 6 projects to push out the product 9 and help the mold release. Next, the product extraction push-out pin 7 projects and the product 9 separates from the movable mold 3. After taking out the product 9, a release agent is sprayed.
【００１０】本実施例のダイカスト鋳造方法は下記の特
徴を有する。第一に、寸法精度を必要とする製品９の孔
１０を成形するための中子ピン５が固定型２に取り付け
られている。従って、図２の型開き状態で、この孔１０
は外気にさらされて冷却収縮する。しかし、型開き直後
にこの孔１０から中子ピン５が既に引き抜かれているた
め、この孔１０の円形内周面１０ａが中子ピン５から離
れて開放され、この内周面１０ａの内径が冷却収縮によ
り例え小さくなっても、中子ピン５の引き抜き時にこの
内周面１０ａに生じ易いかじりや焼付きはなくなる。The die casting method of this embodiment has the following features. First, the core pin 5 for forming the hole 10 of the product 9 that requires dimensional accuracy is attached to the fixed mold 2. Therefore, in the mold open state of FIG.
Is exposed to the outside air and shrinks by cooling. However, since the core pin 5 has already been pulled out of this hole 10 immediately after opening the mold, the circular inner peripheral surface 10a of this hole 10 is released apart from the core pin 5, and the inner diameter of this inner peripheral surface 10a is Even if the core pin 5 is reduced in size due to cooling shrinkage, galling and seizure that are likely to occur on the inner peripheral surface 10a at the time of pulling out the core pin 5 are eliminated.
【００１１】第二に、中子ピン５の抜け勾配を０度００
分から０度２０分位にした。従って、孔１０の円形内周
面１０ａもこの抜け勾配に合わせて成形される。製品９
の用途にも左右されるが、この程度の抜け勾配の範囲で
あれば、精度の高いはめあい公差を得ることができる。Secondly, the clearance of the core pin 5 is set to 0 degrees 00.
From 0 minutes to 0 degrees and 20 minutes. Therefore, the circular inner peripheral surface 10a of the hole 10 is also shaped according to this draft. Product 9
Although it depends on the use of, the fit tolerance can be obtained with high accuracy in this range of the draft.
【００１２】第三に、この抜け勾配にした場合、中子ピ
ン５の引き抜きによるかじりや焼付きが孔１０の円形内
周面１０ａに生じる心配が残る。この点については、型
開き直後に中子ピン５が孔１０から引き抜かれるため、
孔１０の収縮度合いが小さくなり、かじりや焼付きは生
じにくい。しかし、かじりや焼付きをより確実に防止す
るために温度調節用流体通路８を利用して金型１内にお
けるキャビティ４の周辺温度や中子ピン５の表面温度を
制御している。例えば、中子ピン５の表面温度について
は、中子ピン５の引き抜き直後で３５０℃以下に設定
し、離型剤スプレー開始直前で２００℃以上に設定して
いる。この温度制御については、中子ピン５の形状に関
する条件や、離型剤塗布条件や、中子ピン５の冷却及び
キュアリングタイム（凝固時間）等に関する鋳造条件を
設定し、その各種条件で前記温度設定になるように、温
度調節用流体通路８に通す流体に関する条件を各種変更
する。Thirdly, in the case of this draft angle, there is a concern that galling or seizure due to pulling out the core pin 5 may occur on the circular inner peripheral surface 10a of the hole 10. Regarding this point, since the core pin 5 is pulled out from the hole 10 immediately after opening the mold,
The degree of shrinkage of the holes 10 becomes small, and galling and seizure are unlikely to occur. However, in order to more surely prevent galling and seizure, the temperature control fluid passage 8 is used to control the ambient temperature of the cavity 4 and the surface temperature of the core pin 5 in the mold 1. For example, the surface temperature of the core pin 5 is set to 350 ° C. or lower immediately after the core pin 5 is pulled out, and is set to 200 ° C. or higher immediately before the release agent spray is started. Regarding this temperature control, conditions relating to the shape of the core pin 5, conditions for applying the release agent, casting conditions relating to the cooling and curing time (solidification time) of the core pin 5, etc. are set, and the above-mentioned conditions are used. Various conditions relating to the fluid passing through the temperature adjusting fluid passage 8 are changed so that the temperature is set.
【００１３】第四に、型開き用押出ピン６が突出して製
品９を押し出すので、前記抜け勾配を小さくしても、製
品９の型離れが良くなる。本実施例のダイカスト鋳造方
法は、上記の特徴を有するため、製品９の孔１０の内周
面１０ａが精度の高いはめあい公差になるとともに、そ
の内周面１０ａのかじりや焼付きがなくなる。従って、
成形後の機械加工を省略でき、製品９の製造コストを低
下させることができる。Fourth, since the mold opening push-out pin 6 projects to push out the product 9, the product 9 can be released from the mold well even if the relief gradient is small. Since the die casting method of this embodiment has the above-mentioned characteristics, the inner peripheral surface 10a of the hole 10 of the product 9 has a highly accurate fitting tolerance, and the inner peripheral surface 10a is free from galling and seizure. Therefore,
Machining after molding can be omitted, and the manufacturing cost of the product 9 can be reduced.
【００１４】[0014]
【発明の効果】本発明のダイカスト鋳造方法によれば、
成形後の機械加工を省略して製品９の製造コストを低下
させることができる。According to the die casting method of the present invention,
The manufacturing cost of the product 9 can be reduced by omitting machining after the molding.
【図１】 本実施例のダイカスト鋳造方法に利用される
金型の型締め状態を示す部分断面図である。FIG. 1 is a partial cross-sectional view showing a mold clamping state of a mold used in a die casting method of this embodiment.
【図２】 同じく型開き状態を示す部分断面図である。FIG. 2 is a partial cross-sectional view showing the mold opening state of the same.
【図３】 従来のダイカスト鋳造方法に利用される金型
の型締め状態を示す部分断面図である。FIG. 3 is a partial cross-sectional view showing a mold clamping state of a mold used in a conventional die casting method.
【図４】 同じく型開き状態を示す部分断面図である。FIG. 4 is a partial cross-sectional view showing the mold opening state as well.
１…金型、２…固定型、３…可動型、４…キャビティ、
５…中子ピン、６，７…押出ピン、８…温度調節用流体
通路、９…製品、１０…孔、１０ａ…内周面。1 ... Mold, 2 ... Fixed type, 3 ... Movable type, 4 ... Cavity,
5 ... Core pin, 6, 7 ... Extrusion pin, 8 ... Temperature control fluid passage, 9 ... Product, 10 ... Hole, 10a ... Inner peripheral surface.
Claims (1)
を有する中子ピン（５）を取り付けた固定型（２）と、
この固定型（２）に対し開閉可能にした可動型（３）と
からなる金型（１）を型締めしてこの両型（２，３）間
で形成されるキャビティ（４）に溶湯を注入するととも
に、この金型（１）内の温度調節用流体通路（８）によ
り中子ピン（５）の表面温度を制御し、 次に、前記金型（１）を型開きして固定型（２）から可
動型（３）を離し、可動型（３）側にある製品（９）の
孔（１０）から固定型（２）側の中子ピン（５）を引き
抜いてこの孔（１０）の内周面（１０ａ）を開放し、 その後、この製品（９）を可動型（３）から取り出すこ
とを特徴とするダイカスト鋳造方法。1. A fixed mold (2) to which a core pin (5) having a draft of 0 degrees 00 minutes to 0 degrees 20 minutes is attached,
A mold (1) consisting of a movable mold (3) that can be opened and closed with respect to the fixed mold (2) is clamped, and molten metal is poured into a cavity (4) formed between the molds (2, 3). While injecting, the surface temperature of the core pin (5) is controlled by the temperature control fluid passage (8) in the mold (1), and then the mold (1) is opened to a fixed mold. The movable die (3) is separated from (2), and the core pin (5) side of the fixed die (2) is pulled out from the hole (10) of the product (9) on the movable die (3) side, and this hole (10) is pulled out. ), The inner peripheral surface (10a) is opened, and then the product (9) is taken out from the movable mold (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25583694A JPH08117958A (en) | 1994-10-20 | 1994-10-20 | Die casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25583694A JPH08117958A (en) | 1994-10-20 | 1994-10-20 | Die casting method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08117958A true JPH08117958A (en) | 1996-05-14 |
Family
ID=17284279
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25583694A Pending JPH08117958A (en) | 1994-10-20 | 1994-10-20 | Die casting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08117958A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7287572B2 (en) | 2005-05-24 | 2007-10-30 | Tsubakimoto Chain Co. | Method for die casting an aluminum base frame used in a transmission device |
-
1994
- 1994-10-20 JP JP25583694A patent/JPH08117958A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7287572B2 (en) | 2005-05-24 | 2007-10-30 | Tsubakimoto Chain Co. | Method for die casting an aluminum base frame used in a transmission device |
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