CN103100696A - Metal mold gravity casting method - Google Patents
Metal mold gravity casting method Download PDFInfo
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- CN103100696A CN103100696A CN 201310053924 CN201310053924A CN103100696A CN 103100696 A CN103100696 A CN 103100696A CN 201310053924 CN201310053924 CN 201310053924 CN 201310053924 A CN201310053924 A CN 201310053924A CN 103100696 A CN103100696 A CN 103100696A
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- gravity casting
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- metal mold
- pressure ram
- casting method
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Abstract
The invention provides a metal mold gravity casting method. After molten metal is cast into a metal mold mould in a gravity mode, an extrusion rod is used for extruding a cavity of the mould downward in a perpendicular mode on the position of a mould pouring cup, so that the molten metal is solidified under pressure and formed in a flowing mode. The solidified metal is deformed in a plastic mode under the pressure, so that the defects such as shrinkage cavities and shrinkage porosities of castings are avoided, organization is compact, mechanical property is improved, dead heads and working allowance are reduced, and a metal use ratio is high.
Description
Technical field
The invention belongs to the metal mold gravity casting field, be specifically related to a kind of metal gravity casting and push the casting method that combines.
Background technology
Gravity casting refers to that molten metal injects the technique of casting mold under the terrestrial gravitation effect, mainly refers to metal mold casting on narrow justice, mainly for the production of in non-ferrous metal, light casting.Metal liquid is cast under Action of Gravity Field, and filling velocity is slower, can reduce the defective of wrapping up in gas, but the misrun defective can appear in the complex thin-wall foundry goods.Metal liquid is naturally cooling contraction in mould, and foundry goods is organized not fine and closely woven, shrinkage porosity defect of contraction cavity even occurs, and casting pressing port and allowance larger, the waste material.
Take the gravitational casting production of electric bicycle, hub of motorcycle as example, employing center casting, wheel hub center riser is high, and the wheel hub rim arranges riser feeding, and making aluminium liquid casting amount is more than 1.5 times of actual Demand of castings, and using rate of metal is low.
Summary of the invention
In order to solve the existing problem of above metal mold gravity casting, the present invention proposes a kind of method of metal mold gravity casting: the molten metal gravity casting is after metal type dies, at die pouring cup position use pressure ram, described mold cavity is pushed vertically downward, make liquid metals at Under Pressure Solidification, flow forming, plastic deformation occurs in the frozen metal under pressure, make foundry goods without defectives such as shrinkage cavity and porosities, organize fine and closely woven, mechanical property improves, reduce rising head and allowance, using rate of metal is high.
It is as follows that the present invention proposes a kind of concrete grammar of metal mold gravity casting:
(1) after the metal type dies matched moulds, in described mould, after casting, the molten metal liquid level can not surpass the minimum necking down position of cup with the molten metal gravity casting.
(2) after gravity casting finishes, at described cup position employing pressure ram, described mold cavity is pushed vertically downward.Described pressure ram lower end diameter is identical with the minimum necking down of described cup, and it is large that the middle-end diameter becomes, identical with described cup interior shape, and the restriction pressure ram can stretch into the depth capacity of described mold cavity.Described depth capacity is no more than the height of cup position rising head.Described pressure ram moves downward, and enters to keep constant extruding force after described mold cavity, until can not continue to move downward.
(3) casting solidification cooling after, withdraw from described pressure ram from described mold cavity, foundry goods is taken out in die sinking.
Useful technique effect of the present invention:
After the metal gravity casting, by described mold cavity is pushed, make molten metal at the Under Pressure Solidification flow forming, solidify rear generation plastic deformation, can improve significantly the feeding effect of foundry goods, reduce rising head and allowance, improve using rate of metal, simultaneously foundry goods is without the shrinkage cavity and porosity defective, organizes fine and closely wovenly, and performance improves.The present invention is simple to operate, and cost is low.
Description of drawings
Fig. 1 aluminium alloy wheel hub gravitational casting and extruding schematic diagram
Reference numeral: 1, aluminium alloy wheel hub; 2, mould; 3, cup; 4, pressure ram; 5, center riser
The specific embodiment
Below in conjunction with Fig. 1, take the gravitational casting production of aluminium alloy wheel hub as example, the concrete enforcement of a kind of metal mold gravity casting method provided by the invention is described in detail.
(1) after metal type dies 2 matched moulds, in described mould 2, after casting, the molten metal liquid level can not surpass the minimum necking down position of cup 3 with the molten metal gravity casting.
(2) after gravity casting finishes, push vertically downward at described cup 3 positions 4 pairs of described mould 2 die cavities of employing pressure ram.Described pressure ram 4 keeps constant extruding force after stretching into described mold cavity, until can not continue to move downward.Described pressure ram 4 lower end diameter are identical with the minimum necking down of described cup 3, and it is large that the middle-end diameter becomes, identical with described cup 3 interior shapes, limits the depth capacity that described pressure ram 4 can stretch into described mold cavity.Described depth capacity is no more than the height of aluminium alloy wheel hub 1 center riser 5.
(3) aluminium alloy wheel hub 1 solidify cooling after, withdraw from described pressure ram 4 from described mould 2 die cavities, aluminium alloy wheel hub 1 is taken out in die sinking.
Claims (6)
1. the method for a metal mold gravity casting, is characterized in that, the molten metal gravity casting pushes described mold cavity at described die pouring cup position employing pressure ram, vertically downward until casting solidification is cooling after mould.
2. a kind of metal mold gravity casting method according to claim 1 is characterized in that: after gravity casting, the molten metal liquid level can not surpass the minimum necking down position of described die pouring cup.
3. a kind of metal mold gravity casting method according to claim 1, is characterized in that: after described pressure ram vertically enters described mold cavity, keep constant extruding force, until can not continue to move downward.
4. a kind of metal mold gravity casting method according to claim 1, it is characterized in that: described pressure ram lower end diameter is identical with the minimum necking down of described die pouring cup.
5. a kind of metal mold gravity casting method according to claim 1, it is characterized in that: described pressure ram middle-end diameter is larger than the lower end, and is identical with the interior shape of described die pouring cup.
6. a kind of metal mold gravity casting method according to claim 1 is characterized in that: the depth capacity that described pressure ram stretches into described mold cavity can not surpass the height of described cup position casting pressing port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201310053924 CN103100696A (en) | 2013-02-05 | 2013-02-05 | Metal mold gravity casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201310053924 CN103100696A (en) | 2013-02-05 | 2013-02-05 | Metal mold gravity casting method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103100696A true CN103100696A (en) | 2013-05-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201310053924 Pending CN103100696A (en) | 2013-02-05 | 2013-02-05 | Metal mold gravity casting method |
Country Status (1)
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| CN (1) | CN103100696A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105817610A (en) * | 2016-05-16 | 2016-08-03 | 宁波工程学院 | Improved casting die and casting method for metal castings |
| CN106975739A (en) * | 2016-01-17 | 2017-07-25 | 梁长城 | The steel die and its fine casting method cast for stainless steel or cast iron |
| CN108176838A (en) * | 2017-12-28 | 2018-06-19 | 银峰铸造（芜湖）有限公司 | Improve the casting technique and casting mould of casting shrinkage cavity shrinkage porosity |
-
2013
- 2013-02-05 CN CN 201310053924 patent/CN103100696A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106975739A (en) * | 2016-01-17 | 2017-07-25 | 梁长城 | The steel die and its fine casting method cast for stainless steel or cast iron |
| CN105817610A (en) * | 2016-05-16 | 2016-08-03 | 宁波工程学院 | Improved casting die and casting method for metal castings |
| CN105817610B (en) * | 2016-05-16 | 2018-05-25 | 宁波工程学院 | A kind of casting mould for metal castings |
| CN108176838A (en) * | 2017-12-28 | 2018-06-19 | 银峰铸造（芜湖）有限公司 | Improve the casting technique and casting mould of casting shrinkage cavity shrinkage porosity |
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Legal Events
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| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130515 |