JPS59147768A - Casting method - Google Patents
Casting methodInfo
- Publication number
- JPS59147768A JPS59147768A JP2331883A JP2331883A JPS59147768A JP S59147768 A JPS59147768 A JP S59147768A JP 2331883 A JP2331883 A JP 2331883A JP 2331883 A JP2331883 A JP 2331883A JP S59147768 A JPS59147768 A JP S59147768A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- pressure
- molds
- molten metal
- casting
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/06—Vacuum casting, i.e. making use of vacuum to fill the mould
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、通気性材質からなる鋳型に設けた鋳型空洞部
を減圧することにより、溶融金属をこの鋳型空洞部に吸
引する鋳造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a casting method in which molten metal is sucked into a mold cavity provided in a mold made of an air-permeable material by reducing the pressure in the mold cavity.
上記の鋳造方法としては、例えは特開昭５５−７７９６
８に開示されている。この方法では、上下の鋳型の見切
面の周縁部を接着し、上鋳型の上部周縁部には、減圧装
置に対応する平坦なシール面を形成し、減圧装置内を一
定圧力に減圧することにより鋳型空洞部も減圧させ、下
鋳型に設けた湯道から溶融金属を鋳型空洞部に吸引する
ものである。The above casting method is, for example, JP-A-55-7796.
8. In this method, the peripheral edges of the parting surfaces of the upper and lower molds are glued together, a flat sealing surface is formed on the upper peripheral edge of the upper mold that corresponds to the pressure reducing device, and the inside of the pressure reducing device is reduced to a constant pressure. The mold cavity is also depressurized and molten metal is sucked into the mold cavity from a runner provided in the lower mold.
本発明の目的は、上記従来の方法における減圧装置が上
下鋳型を密着保持する力をより増大させる鋳造方法を提
供することにある。本発明は１鋳型空洞部に溶融金属を
吸引するときの減圧装置内の圧力よりも、＃型空洞部に
溶融金属を吸引後に上下鋳型を型ばらし装置に搬送する
ときの圧力を小になる制御するようにした鋳造方法であ
る。An object of the present invention is to provide a casting method in which the pressure reduction device used in the conventional method further increases the force with which the upper and lower molds are closely held. The present invention provides control so that the pressure when transporting the upper and lower molds to the mold breaking device after sucking the molten metal into the mold #1 cavity is lower than the pressure inside the pressure reducing device when sucking the molten metal into the #1 mold cavity. This is a casting method designed to
以下本発明を実施例に基いて説明する。第１図は本発明
に用いる鋳型の一例を示す断面図である。The present invention will be explained below based on examples. FIG. 1 is a sectional view showing an example of a mold used in the present invention.
図において、１は上鋳型でシェルモールドなどの熱硬化
性樹脂を含む通気性材質からなっている。In the figure, 1 is an upper mold made of a breathable material containing a thermosetting resin such as a shell mold.
２は下鋳型で、上鋳型と同様の通気性鋳型からなってい
る。上下の鋳型１２の間には、鋳物製品となる鋳型空洞
部３ａ、 ３ｂ・・・が形成されている。下鋳型２には
、各鋳型空洞部３ａ、 ３ｂ・・・に連通し、下方に呻
びる細長い湯道４ａ、 ４ｂ・・・が設けられている。2 is a lower mold, which is made of an air permeable mold similar to the upper mold. Mold cavities 3a, 3b, . . . are formed between the upper and lower molds 12 to form a cast product. The lower mold 2 is provided with elongated runners 4a, 4b, . . . that extend downward and communicate with the mold cavities 3a, 3b, .
５は水平方向に伸びる上下鋳型１．２の見切面である。5 is a parting surface of the upper and lower molds 1.2 extending in the horizontal direction.
下鋳型２の上部の周縁部には、その全周に平坦なシール
部６を設けている。A flat seal portion 6 is provided around the entire circumference of the upper peripheral edge of the lower mold 2.
第２図は、減圧装置７で下鋳型２を上鋳型１と共に吸着
保持したときの状態を示す図である。このとき、減圧装
置７の平坦な下端面は、その全周が下鋳型２の平坦なシ
ール部６に密着させる。また、減圧装置７の内部には空
間部８を設けると共に、空間部８の空気を吸引するため
の吸引口９を設けている。ｅ引目９は、真空ポンプ（図
示せず）などの真空発生装置に接続されている。１０は
減圧装置７を支持するための支柱である。減圧装置７は
、支柱１０に連結された駆動装置（図示せず）により、
上下方向及び水平方向の移動が萌能になっている。FIG. 2 is a diagram showing a state in which the lower mold 2 and the upper mold 1 are held by suction in the pressure reducing device 7. At this time, the entire circumference of the flat lower end surface of the pressure reducing device 7 is brought into close contact with the flat seal portion 6 of the lower mold 2. Further, a space 8 is provided inside the pressure reducing device 7, and a suction port 9 for sucking air from the space 8 is provided. The e-pull 9 is connected to a vacuum generator such as a vacuum pump (not shown). 10 is a support for supporting the pressure reducing device 7. The decompression device 7 is operated by a drive device (not shown) connected to the column 10.
It is capable of vertical and horizontal movement.
次に本発明の作用について説明する。まず、上下鋳型１
．２を鋳型成形材（図示せず）により成形し、第１図に
示すように、上下鋳型１．２をその見切面５で型合せを
行なう。このとき、上下鋳型１２の見切面に接着剤を塗
布して上下鋳型１．２を接着してもよい。Next, the operation of the present invention will be explained. First, upper and lower mold 1
．． 2 is molded using a mold forming material (not shown), and as shown in FIG. 1, the upper and lower molds 1.2 are aligned at their parting surfaces 5. At this time, the upper and lower molds 1.2 may be bonded together by applying an adhesive to the cutout surfaces of the upper and lower molds 12.
続いて、第２図に示すように、減圧装置７を平坦なシー
ル部６の上面まで降下させ、吸引口９に連通している真
空発生装置を作動させて、空間部８を減圧（圧力Ｐｌ）
することにより上下鋳型１．２を減圧装置７で吸着保持
する。このとき、下鋳型２の平坦なシール部６と減圧装
置７の下端面は気密に接合させるようにする。Subsequently, as shown in FIG. 2, the pressure reducing device 7 is lowered to the upper surface of the flat seal portion 6, and the vacuum generator communicating with the suction port 9 is activated to reduce the pressure in the space 8 (pressure Pl )
By doing so, the upper and lower molds 1.2 are held by suction by the pressure reducing device 7. At this time, the flat seal portion 6 of the lower mold 2 and the lower end surface of the pressure reducing device 7 are made to be airtightly joined.
次に、上下鋳型１，２を吸着保持した減圧装に７を支柱
１０の駆動装置を作動させて、第３図に示す溶融金属１
１を収容する炉１２の上方まで移動させる。Next, the molten metal 1 shown in FIG.
1 above the furnace 12 that houses the 1.
続いて、第３図に示すように減圧装置７を降下させ、下
鋳型２の湯道４ａ、 ４ｂ・・・を溶融金＾１１に浸漬
する。続いて、吸引口９に連通している真空ポンプの作
動をより強くして減圧装に７の空間部８の圧力をＰ２に
しく Ｐｚ ＞ １’＋ ） 、空間部８の空気を一定
時間吸引する。すると、空間部８は減圧されると同時に
、上鋳型１は通気性を有する部材がらなっているので鋳
型空洞部３ａ、 ３ｂ・・・も減圧される。Subsequently, as shown in FIG. 3, the pressure reducing device 7 is lowered, and the runners 4a, 4b, . . . of the lower mold 2 are immersed in the molten metal ^11. Next, the operation of the vacuum pump connected to the suction port 9 is strengthened to make the pressure in the space 8 of the decompression device 7 to P2 (Pz >1'+), and the air in the space 8 is sucked for a certain period of time. do. Then, the pressure in the space 8 is reduced, and at the same time, since the upper mold 1 is made of a breathable member, the pressure in the mold cavities 3a, 3b, . . . is also reduced.
鋳型空洞部３ａ、 ３ｂ・・・が減圧されると、溶融金
属１１は細長い湯道４ａ、 ４ｂ・・・を通って鋳型空
洞部３ａ、３ｂ・・・に吸引される。そして、一定時間
（細長い湯道４ａ、４ｂ・・・内の溶融金属の一部が凝
固する程度の時間）経過後、真空ポンプの作動をさらに
強くし、減圧装置７の空間部８の圧力を第５図に示すよ
うにＰａ （Ｐｘ ＞Ｐｇ ＞ｐｓ ）に減圧する。す
ると、溶融金属が吸引された上下鋳型１．２をより強い
吸淘力で吸着保持することができる。続いて、上下鋳型
１２を減圧装置７で吸着保持した状態で型はらし装置ま
で移動させる。続いて、真空発生装置の作動を停止（大
気圧Ｐｏに開放）させ、型はらし装置で上下鋳型１．２
の型はらしを行なって鋳型空洞部３ａ３ｂ・・・に形成
された鋳物製品を取り出す。When the pressure in the mold cavities 3a, 3b, . . . is reduced, the molten metal 11 is sucked into the mold cavities 3a, 3b, . After a certain period of time has elapsed (long enough to solidify a portion of the molten metal in the elongated runners 4a, 4b, etc.), the operation of the vacuum pump is further increased to reduce the pressure in the space 8 of the decompression device 7. As shown in FIG. 5, the pressure is reduced to Pa (Px > Pg > ps). Then, the upper and lower molds 1.2 into which the molten metal has been sucked can be held by suction with a stronger suction force. Subsequently, the upper and lower molds 12 are moved to a mold removal device while being held under suction by the pressure reducing device 7. Next, the operation of the vacuum generator is stopped (opened to atmospheric pressure Po), and the upper and lower molds 1.2 are removed using a mold removal device.
The mold is removed and the cast product formed in the mold cavity 3a3b... is taken out.
なお、上記実施例においては、下鋳型２の平坦なシール
部を減圧装置７で吸着保持する例について説明したが、
第５図に示すように、上鋳型１に平坦なシール部７を設
けて減圧装置７で吸着保持してもよい。In addition, in the above embodiment, an example was explained in which the flat seal portion of the lower mold 2 is held by suction with the pressure reducing device 7.
As shown in FIG. 5, the upper mold 1 may be provided with a flat seal portion 7 and held by suction with a pressure reducing device 7.
以上に説明した本発明は次の効果を有している。The present invention described above has the following effects.
ｌ）鋳型空洞部に溶融金属を吸引後、上下鋳型を炉から
引き上げるとき、減圧装亀内を鋳込重量に見合った分だ
け更に減圧することができるので、上下鋳型を何んらの
支障なく型はらし装置まで搬送することができる。l) When the upper and lower molds are pulled out of the furnace after the molten metal is sucked into the mold cavity, the pressure inside the vacuum chamber can be further reduced by an amount commensurate with the weight of the casting, so the upper and lower molds can be moved without any problems. It can be transported to a mold removal device.
２）第４図に示す通り最初からＰａの圧力で溶融金属を
鋳型空洞部に吸引する（鋳込む）ことも可能であるが、
圧力を下げ過びると鋳物製品の肌が悪くなる。従って、
鋳型空洞部に溶融金属を吸引するときの圧力Ｐ２は、Ｐ
ａ ＞ Ｐｓにした方が鋳肌が良くなる。2) As shown in Figure 4, it is possible to suck (cast) the molten metal into the mold cavity from the beginning with a pressure of Pa;
If the pressure is lowered too much, the skin of the cast product will deteriorate. Therefore,
The pressure P2 when drawing the molten metal into the mold cavity is P
The casting surface will be better if a > Ps.
第１図は本発明に用いる鋳型の一例を示す一部Ｉｌ１面
図、第２図は第１図に示す鋳型を減圧装置で吸着保持し
たときの状態を示す断面図、第３図は第１図に示す鋳型
を浴奮を吸引している状態を示す断面図、第４図は本発
明に用いる鋳型の他の例を示す断面（２）である。
ｌ：上ＳＺ、２：下ｍ型、３ａｓ ３ｂ ： 鋳９３空
洞部４ａ、 ４ｂ ：湯道、６二平坦なシール部、７：
減圧装倉、１１：溶融金属。
第７図
圧
鴫２図 力
４ａ ４ｂ ４ｃ
°［
第５図
・ＩＧｆ″Ｉの大小
昭＋１１５８年′４１・許願第 ２３３１８ 号黛明
°″）名 称 鋳造方法
？＋ｌｉ Ｉｌをする台
補正命令の日付 昭和５８年５月３１日（発送
日）ン市 １１ の λ・１ＳｔＡ明Ｍｌｉｌ
Ｆの「図面の簡単な説明」の媚。
補正の内容
明細瘉第６頁１７〜１８行目の「４第４図は〜断面図は
本発明に用いる鋳型の他の例を示−を断面図である。」
以 上Fig. 1 is a partial plan view showing an example of the mold used in the present invention, Fig. 2 is a cross-sectional view showing the state when the mold shown in Fig. 1 is held by suction with a pressure reducing device, and Fig. 3 is a cross-sectional view showing the mold shown in Fig. 1. FIG. 4 is a cross-sectional view showing the mold shown in the figure in a state in which steam is being sucked, and FIG. 4 is a cross-sectional view (2) showing another example of the mold used in the present invention. l: upper SZ, 2: lower m type, 3as 3b: cast 93 cavity 4a, 4b: runner, 62 flat seal part, 7:
Vacuum loading, 11: Molten metal. Fig. 7 Pressure Drop Fig. 2 Force 4a 4b 4c ° [Fig. Date of correction order for +li Il May 31, 1981 (shipment date)
F's "simple explanation of drawings" is a charm. Details of the amendment, page 6, lines 17-18, ``4 Figure 4 is a sectional view showing another example of the mold used in the present invention.''
Claims (1)
型の周縁部に設けた平坦なシール部に密層可能な減圧装
置に連通した真空発生装置により前記減圧装置内を減圧
し、前記下鋳型に設けた湯道を通して溶融金属を鋳型空
洞部に吸引する鋳造方法において、前記減圧装置内の圧
力を、鋳型空洞部に溶融金属をｇ＆σ１するときの圧力
〉鋳型空洞部に溶融金属を吸引後に上下鋳型を型はらし
装置に搬送するときの圧力にすることを特徴とする鋳造
方法。Upper and lower molds made of a breathable material, and a vacuum generator connected to a pressure reducing device that can be tightly sealed to a flat seal provided on the periphery of the upper mold or the lower mold, reduce the pressure in the pressure reducing device, and remove the pressure inside the lower mold. In a casting method in which molten metal is drawn into a mold cavity through a runner installed in A casting method characterized by applying pressure when transporting the mold to a mold removal device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2331883A JPS59147768A (en) | 1983-02-15 | 1983-02-15 | Casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2331883A JPS59147768A (en) | 1983-02-15 | 1983-02-15 | Casting method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59147768A true JPS59147768A (en) | 1984-08-24 |
Family
ID=12107231
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2331883A Pending JPS59147768A (en) | 1983-02-15 | 1983-02-15 | Casting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59147768A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0225004A2 (en) * | 1985-11-27 | 1987-06-10 | General Motors Corporation | Counter-gravity casting mould |
| EP0226315A2 (en) * | 1985-12-09 | 1987-06-24 | General Motors Corporation | Countergravity casting apparatus |
| JPS6384756A (en) * | 1986-09-24 | 1988-04-15 | ゼネラル モ−タ−ズ コ−ポレ−シヨン | Anti-gravity mold |
| JPH073856U (en) * | 1991-01-21 | 1995-01-20 | ゼネラル・モーターズ・コーポレーション | Anti gravity mold |
-
1983
- 1983-02-15 JP JP2331883A patent/JPS59147768A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0225004A2 (en) * | 1985-11-27 | 1987-06-10 | General Motors Corporation | Counter-gravity casting mould |
| EP0226315A2 (en) * | 1985-12-09 | 1987-06-24 | General Motors Corporation | Countergravity casting apparatus |
| JPS6384756A (en) * | 1986-09-24 | 1988-04-15 | ゼネラル モ−タ−ズ コ−ポレ−シヨン | Anti-gravity mold |
| JPH073856U (en) * | 1991-01-21 | 1995-01-20 | ゼネラル・モーターズ・コーポレーション | Anti gravity mold |
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