US3744546A - Oxygen flushing pressure die-casting method - Google Patents
Oxygen flushing pressure die-casting method Download PDFInfo
- Publication number
- US3744546A US3744546A US00172579A US3744546DA US3744546A US 3744546 A US3744546 A US 3744546A US 00172579 A US00172579 A US 00172579A US 3744546D A US3744546D A US 3744546DA US 3744546 A US3744546 A US 3744546A
- Authority
- US
- United States
- Prior art keywords
- gas
- oxygen
- casting
- die
- casting method
- 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
- 238000004512 die casting Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 34
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 239000001301 oxygen Substances 0.000 title claims abstract description 25
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 25
- 238000011010 flushing procedure Methods 0.000 title description 3
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910001882 dioxygen Inorganic materials 0.000 claims abstract description 24
- 239000011261 inert gas Substances 0.000 claims abstract description 23
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 24
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 6
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 3
- 239000001569 carbon dioxide Substances 0.000 claims description 3
- 239000001307 helium Substances 0.000 claims description 3
- 229910052734 helium Inorganic materials 0.000 claims description 3
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 3
- 238000005266 casting Methods 0.000 abstract description 32
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 239000011148 porous material Substances 0.000 description 21
- 239000000155 melt Substances 0.000 description 11
- 239000008246 gaseous mixture Substances 0.000 description 9
- 230000007547 defect Effects 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000007711 solidification Methods 0.000 description 4
- 230000008023 solidification Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 235000010724 Wisteria floribunda Nutrition 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/14—Machines with evacuated die cavity
Definitions
- This invention relates to an oxygen flush pressure die-casting method and more particularly to an improved oxygen flush pressure die-casting method for obtaining sound die-cast products substantially free of either blow holes or shrinkage holes.
- Pressure die-casting is an effective and efficient mass-production casting method for obtaining castings having a beautiful cast surface and high dimensional precision but is subject to the drawback that numerous pores are produced in the castings and reduce their strength.
- the main cause for such pores in these die-cast products is the entrapment of air present in the die cavity and injecting sleeve (where injection casting is used) into the melt which appears as numerous blow holes in the products.
- oxygen gas is fed into a die-casting apparatus in advance so that the die cavity and injecting sleeve may be filled with the oxygen gas to replace the air initially present in such spaces and then molten metal is injected'into the die cavity so that the oxygen gas is entrapped into the melt where it reacts with the melt and ultimately appears in the form of fine oxide particles dispersed in the casting.
- shrinkage pores are farlarger. than similar pores produced by contained air-bubbles in conventionally produced castings and are of irregular form, while the pores or blow holes produced'by air bubbles are substantially spherical. Further, whereas the'holes caused by air bubbles are generally distributed over substantially all the parts of the casting, shrinkage pores primarily occur in zones where solidificationof the melt is retarded, such as in the thick parts of the casting, and therefore can be distinctly distinguished from the holes produced by the :air bubbles.
- An object of the present invention is therefore to provide an oxygen flush pressure die-casting method whereby the formation of large shrinkage pores in the castings is prevented as well as the production of blow holes so that structurally sound die-cast products substantially free of internal defects can be obtained.
- This casting was made by injecting the melt at a casting temperature of 700 C. and amelt injecting'velocity of m/sec. first by a conventional pressure die-casting method wherein no replacement with oxygen gas was made, second, by the oxygen flush method wherein an industrial pure oxygen gas of a purity of 99.9 percent was'introduced into the die-casting apparatus to replace the air present in the die cavity, and third, by the die-casting method according to the present invention wherein the air in the die cavity was replaced with a gaseousmixture of the same industrial'pure oxygen gas with'sufficiently added nitrogen gas to make 1.5 percentby volume on the total volume.
- the amount of inert gas to be added to the oxygen gas introduced into the casting apparatus according to the present invention should be limited to a range of l to percent by volume or preferably about 1 to 5 percent by volume to achieve the shrinkage pore elimination effect without introducing internal defects in the casting substantially due to the formation of gas bubbles in the injected melt.
- the amount of added inert gas is less than the above mentioned range, the effect of controlling shrinkage pores produced in the casting will be reduced while, if that range is exceeded, pores from gas bubbles will increase and the soundness of the casting will be impaired.
- Inert gases useful for addition to the oxygen gas in the present invention are those which will not react substantially or at all with the metal melt at the casting temperature. According to experiments, it has been found that not only such normally accepted inert gases as nitrogen gas, argon gas or helium gas but also such quasi-inert gases as carbon dioxide or a gaseous mixture of these gases can be used.
- the respective gases in introducing a gaseous mixture of an oxygen gas and an inert gas into a die cavity, the respective gases may be separately fed at a proper volume ratio through gas feeding ports provided in the injecting sleeve or in the casting die of the diecasting apparatus or may be prepared beforehand as a uniform gaseous mixture at a proper volume ratio and fed as such through a gas feeding port. Since a more uniform gaseous mixture can be fed and filled in the die cavity, the latter feeding method has shown a more favorable result.
- an oxygen flush pressure die-casting method for injection casting of molten metal into a die cavity wherein air present in said die cavity is displaced in advance with oxygen gas fed into the cavity, the improvement comprising the step of adding a small amount of at least I percent by volume of an inert gas to said oxygen gas which is to displace the air present in said die cavity.
- An oxygen flush pressure die-casting method according to claim 1 wherein the amount of inert gas added to said oxygen gas is inthe range of 1-10 Vol percent of the total gas mixture fed into said die cavity.
- An oxygen flush pressure die-casting method according to claim 1 wherein said oxygen gas and inert gas are homogeneously mixed exteriorly of the die cavity and then fed into the die cavity through a gas feeding inlet provided in a die casting device.
- An oxygen flush pressure die-casting method wherein said oxygen gas and inert gas are fed separately into said die cavity through separate gas feeding inlets provided in a die-casting device.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Manufacture Of Alloys Or Alloy Compounds (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP45071740A JPS5021145B1 (de) | 1970-08-18 | 1970-08-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3744546A true US3744546A (en) | 1973-07-10 |
Family
ID=13469209
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US00172579A Expired - Lifetime US3744546A (en) | 1970-08-18 | 1971-08-17 | Oxygen flushing pressure die-casting method |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US3744546A (de) |
| JP (1) | JPS5021145B1 (de) |
| BE (1) | BE771394A (de) |
| CA (1) | CA952687A (de) |
| DE (1) | DE2141452A1 (de) |
| FR (1) | FR2102331B1 (de) |
| GB (1) | GB1310071A (de) |
| IT (1) | IT942154B (de) |
| NL (1) | NL7111323A (de) |
| SE (1) | SE381413B (de) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4085791A (en) * | 1976-01-26 | 1978-04-25 | International Lead Zinc Research Organization, Inc. | Method of pore-free die casting |
| US6308766B1 (en) * | 1999-03-05 | 2001-10-30 | Alusuisse Technology & Management Ltd. | Process for die-casting light-weight metals |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3999593A (en) * | 1976-02-19 | 1976-12-28 | International Lead Zinc Research Organization, Inc. | Method and apparatus for pore-free die casting |
| KR102602006B1 (ko) * | 2021-10-07 | 2023-11-14 | 김준수 | 복잡한 내부 형상을 갖는 제품의 제조방법 |
-
1970
- 1970-08-18 JP JP45071740A patent/JPS5021145B1/ja active Pending
-
1971
- 1971-08-16 GB GB3836871A patent/GB1310071A/en not_active Expired
- 1971-08-17 BE BE771394A patent/BE771394A/xx unknown
- 1971-08-17 US US00172579A patent/US3744546A/en not_active Expired - Lifetime
- 1971-08-17 CA CA120,742A patent/CA952687A/en not_active Expired
- 1971-08-17 NL NL7111323A patent/NL7111323A/xx unknown
- 1971-08-17 SE SE7110466A patent/SE381413B/xx unknown
- 1971-08-18 IT IT52357/71A patent/IT942154B/it active
- 1971-08-18 FR FR7130067A patent/FR2102331B1/fr not_active Expired
- 1971-08-18 DE DE19712141452 patent/DE2141452A1/de active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4085791A (en) * | 1976-01-26 | 1978-04-25 | International Lead Zinc Research Organization, Inc. | Method of pore-free die casting |
| US6308766B1 (en) * | 1999-03-05 | 2001-10-30 | Alusuisse Technology & Management Ltd. | Process for die-casting light-weight metals |
Also Published As
| Publication number | Publication date |
|---|---|
| NL7111323A (de) | 1972-02-22 |
| IT942154B (it) | 1973-03-20 |
| CA952687A (en) | 1974-08-13 |
| SE381413B (sv) | 1975-12-08 |
| BE771394A (fr) | 1971-12-31 |
| GB1310071A (en) | 1973-03-14 |
| FR2102331A1 (de) | 1972-04-07 |
| DE2141452A1 (de) | 1972-03-09 |
| JPS5021145B1 (de) | 1975-07-21 |
| FR2102331B1 (de) | 1975-07-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5058653A (en) | Process for lost foam casting of metal parts | |
| US3703922A (en) | Process for the manufacture of nodular cast iron | |
| US3744546A (en) | Oxygen flushing pressure die-casting method | |
| US5161595A (en) | Process for the lost foam casting, under low pressure, of aluminium alloy articles | |
| US2310766A (en) | Casting metals | |
| JPH0317236A (ja) | 発泡金属の製造方法 | |
| KR920006111B1 (ko) | 대기용해에 의한 알루미늄-리튬합금의 제조방법 | |
| JPH0985389A (ja) | 鋳造用多孔質金型材及びその製造方法 | |
| AU633154B2 (en) | Method of controlling the rate of heat extraction in mould casting | |
| KR20010015138A (ko) | 마그네슘 합금의 용해 방법 | |
| US3548914A (en) | Soluble core fabrication | |
| US4057098A (en) | Method of producing thin-walled castings | |
| US4166604A (en) | Mold for fabricating a sparger plate | |
| JP2872863B2 (ja) | チクソキャスト用ビレットの製造方法 | |
| US2380201A (en) | Manufacture of castings | |
| JPH0740032A (ja) | 金型鋳造法とその装置 | |
| US4225544A (en) | Method for fabricating a sparger plate for use in degassing of molten metal | |
| GB1198108A (en) | Method of Producing Beryllium Particulate Composites | |
| GB1406026A (en) | Prevention of shrinkage cavities and voids in metal ingots | |
| JPH0227065B2 (de) | ||
| SU1320015A1 (ru) | Способ модифицировани чугуна в литейной форме | |
| JP3215769B2 (ja) | アルミニウム合金製鋳造品の成形方法 | |
| RU2188733C2 (ru) | Смесь для литейных форм и стержней | |
| JPH0780597A (ja) | アルミニウム合金鋳物の消失模型による鋳造方法 | |
| CN114472839A (zh) | 高强韧稀土镁合金筒形铸件的成形方法 |