JP2638536B2 - Salt core for casting - Google Patents
Salt core for castingInfo
- Publication number
- JP2638536B2 JP2638536B2 JP51695A JP51695A JP2638536B2 JP 2638536 B2 JP2638536 B2 JP 2638536B2 JP 51695 A JP51695 A JP 51695A JP 51695 A JP51695 A JP 51695A JP 2638536 B2 JP2638536 B2 JP 2638536B2
- Authority
- JP
- Japan
- Prior art keywords
- salt core
- pressure
- casting
- pressing
- sodium chloride
- 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 - Fee Related
Links
Landscapes
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は塩化ナトリウムの粉末よ
りなる塩中子に関するもので、鋳造用の中子として利用
されるものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a salt core made of sodium chloride powder and is used as a core for casting.
【０００２】[0002]
【従来の技術】塩化ナトリウムの粉末を油圧プレスで強
圧して鋳造用の中子が成形されている。2. Description of the Related Art Casting cores are formed by strongly pressing sodium chloride powder with a hydraulic press.
【０００３】従来の加圧方法は一段の加圧方式で、圧力
変化曲線を第３図Ｂに示し、加圧時間は約６秒で加圧力
はほぼ２０００kg／cm2 以上である。A conventional pressurizing method by pressurizing system of one step, represents the pressure change curve in FIG. 3 B, pressing time pressure in about 6 seconds is approximately 2000 kg / cm 2 or more.
【０００４】加圧力は面圧力２０００kg／cm2 以下では
塩中子の面粗度が荒く、鋳造時に溶湯が浸入して製品の
面粗度が悪化するものである。When the pressing force is less than 2,000 kg / cm 2 , the surface roughness of the salt core is rough, and the molten metal infiltrates during casting to deteriorate the surface roughness of the product.
【０００５】[0005]
【発明が解決しようとする課題】塩化ナトリウムの加圧
力を面圧で２０００kg／cm2 以上とした場合、加圧速度
が２ｍ／see 以上にすると密度が不均一になり、割れが
発生する。When the pressing force of sodium chloride is 2000 kg / cm 2 or more in terms of surface pressure, if the pressing speed is 2 m / see or more, the density becomes uneven and cracks occur.
【０００６】また、リング状の塩中子を成形した場合に
は第４図に示すように表面に割れ２が発生する。１はリ
ング状の塩中子である。When a ring-shaped salt core is formed, a crack 2 is generated on the surface as shown in FIG. 1 is a ring-shaped salt core.
【０００７】この割れの発生を抑えるためには加圧時間
３５〜４０秒の加圧速度を２mm/see以下にする必要があ
り、これを第３図Ｃの一点鎖線に示す。In order to suppress the occurrence of cracks, it is necessary to set the pressing speed for a pressing time of 35 to 40 seconds to 2 mm / see or less, which is shown by the dashed line in FIG. 3C.
【０００８】加圧速度が２mm／see は通常の粉末成形の
加圧速度の１／５以下であり、この様に遅い速度を得る
ためには油圧装置の複雑な制御が必要であり、設備費が
高価となり、又遅い連度を安定して得ることは非常に難
しく、加圧時間が長くなり生産性が低下するという問題
点がある。[0008] The pressing speed of 2 mm / see is 1/5 or less of the pressing speed of ordinary powder molding, and in order to obtain such a low speed, complicated control of a hydraulic device is required, and equipment cost is increased. However, there is a problem that it is expensive, and it is very difficult to stably obtain a slow connection, and the pressurizing time is prolonged and the productivity is reduced.
【０００９】本発明は鋳造用中子に使用する塩化ナトリ
ウムの粉末に油圧プレスが加圧する場合に、１０mm／se
e 以上の加圧速度にて割れがなく密度も均一に成形出来
る塩中子を技術的課題とするものである。According to the present invention, when a hydraulic press presses sodium chloride powder used for a casting core, the pressure is 10 mm / se.
The object of the present invention is to provide a salt core which can be molded without cracks and at a uniform density at a pressing speed of e or more.
【００１０】[0010]
【課題を解決するための手段】前記課題を解決するため
に講じた技術的手段は次のようである。すなわち、塩化
ナトリウム粉末よりなく塩中子に於て、前記塩化ナトリ
ウム粉末を最初に１５００〜２１００kg／cm2 の面圧ま
で加圧し、次に面圧を零まで戻し、これを１回以上繰り
返した後、最終加圧することにより形成した塩中子であ
る。The technical measures taken to solve the above problems are as follows. That is, the sodium chloride powder was first pressurized to a surface pressure of 1500 to 2100 kg / cm 2 in the salt core rather than the sodium chloride powder, and then the surface pressure was returned to zero, and this was repeated one or more times. Later, it is a salt core formed by final pressing.
【００１１】[0011]
【作用】１段加圧から加圧の途中で圧力を零とし、再度
加圧するもので、これを１回以上繰り返し最終圧力まで
加圧することにより、塩中子は密度が均一で、割れの発
生がまつたくないものである。[Function] The pressure is reduced to zero in the middle of pressurization from the first stage pressurization, and pressurized again. This is repeated one or more times to the final pressure, so that the salt core has a uniform density and cracks occur. Is something that you don't want to keep.
【００１２】[0012]
【実施例】以下実施例について説明する。Embodiments will be described below.
【００１３】塩化ナトリウムの粉末に油圧プレスで加圧
して鋳造用の中子成形する場合に加圧方法を１段加圧か
ら加圧の途中で圧力を零に落とし、再度加圧する方法を
行うものである。In the case of pressing a sodium chloride powder with a hydraulic press to form a core for casting, the pressing method is a method in which the pressure is reduced from zero to zero in the middle of pressing and then pressurized again. It is.
【００１４】第１図の加圧方法は加圧を開始して面圧が
１５００〜２１００kg／cm2 に到達した時点で圧力を零
に戻し、再び加圧するもので、この曲線をＡ1 に示す。[0014] pressurizing method of Figure 1 is returned to zero pressure when the surface pressure to start the pressurization has reached the 1500~2100kg / cm 2, in which pressurized again shows the curve A 1 .
【００１５】そして、この動作を１回以上すなわちＡ2
に示すように繰り返した後、最終圧力Ａ3 まで加圧す
る。This operation is performed one or more times, that is, A 2
After repeated as shown in, pressurized to a final pressure A 3.
【００１６】第１図は３回繰り返しの場合の圧力変化を
示し、それによつて成形された塩中子を第２図に示す
が、前記の方法によつて成形された塩中子１は密度が均
一であり成形時の残留応力に耐えることができ割れの発
生がないものである。FIG. 1 shows the change in pressure in the case of three repetitions, and FIG. 2 shows the salt core formed by the above method. Are uniform, can withstand residual stress during molding, and have no cracks.
【００１７】[0017]
【発明の効果】本発明は次の効果を有する。すなわち、
従来技術としてガス抜き作動として面圧１００kg/cm2〜
５００kg/cm2付近まで加圧し、圧力を零に戻す操作を数
回繰り返した後、最終加圧する方法もあるが、これは型
内に閉じ込まれた空気を除去するものであり、割れの発
生を抑えることはできない。The present invention has the following effects. That is,
As a conventional technology, degassing operation has a surface pressure of 100 kg / cm 2 ~
500 kg / cm 2 near to pressurize, after repeating several times the operation to return to zero pressure, there is a method of applying a final pressure, which is intended to remove any air incorporated closed the mold, the cracking Cannot be suppressed.
【００１８】これに対し本発明の方法で行えば、加圧時
間の短縮により生産性が向上とし、油圧の制御が簡単で
設備費が低減し、密度のバラツキの減少により品質が向
上し、塩中子の割れの防止が出来るものである。On the other hand, when the method of the present invention is used, the productivity is improved by shortening the pressurizing time, the control of the hydraulic pressure is simple, the equipment cost is reduced, and the quality is improved by reducing the variation in the density. It can prevent the core from cracking.
【図１】本実施例の場合の圧力変化曲称を示す図であ
る。FIG. 1 is a diagram showing pressure change tunes in the case of the present embodiment.
【図２】本実施例の塩中子の説明図である。FIG. 2 is an explanatory diagram of a salt core of the present embodiment.
【図３】従来例の圧力変化曲称示す図である。FIG. 3 is a diagram showing a pressure change music title of a conventional example.
【図４】塩中子の割れの説明図である。FIG. 4 is an explanatory view of cracking of a salt core.
１ リング状の塩中子 ２ 割れ 1 ring-shaped salt core 2 crack
Claims (1)
鋳造用の塩中子に於て、前記塩化ナトリウム粉末を最初
に１５００〜２１００kg／cm2 の面圧まで加圧して、次
に面圧を零まで戻し、これを１回以上繰り返した後、最
終加圧することにより形成した鋳造用塩中子。1. In a salt core for casting formed by forcing sodium chloride powder under high pressure, the sodium chloride powder is first pressed to a surface pressure of 1500 to 2100 kg / cm 2 , and then the surface pressure is reduced. A salt core for casting formed by returning to zero, repeating this one or more times, and finally pressing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP51695A JP2638536B2 (en) | 1995-01-06 | 1995-01-06 | Salt core for casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP51695A JP2638536B2 (en) | 1995-01-06 | 1995-01-06 | Salt core for casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07195148A JPH07195148A (en) | 1995-08-01 |
| JP2638536B2 true JP2638536B2 (en) | 1997-08-06 |
Family
ID=11475944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP51695A Expired - Fee Related JP2638536B2 (en) | 1995-01-06 | 1995-01-06 | Salt core for casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2638536B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021124542A1 (en) * | 2019-12-20 | 2021-06-24 | 本田金属技術株式会社 | Breathable salt core and method for manufacturing same |
| JP2021098212A (en) | 2019-12-23 | 2021-07-01 | トヨタ自動車株式会社 | Method for producing salt core |
-
1995
- 1995-01-06 JP JP51695A patent/JP2638536B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07195148A (en) | 1995-08-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |