CN105710349A - Metal mold gravity casting method - Google Patents
Metal mold gravity casting method Download PDFInfo
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- CN105710349A CN105710349A CN201410741138.7A CN201410741138A CN105710349A CN 105710349 A CN105710349 A CN 105710349A CN 201410741138 A CN201410741138 A CN 201410741138A CN 105710349 A CN105710349 A CN 105710349A
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- gravity casting
- metal
- metal mold
- pressure ram
- casting method
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Abstract
The invention provides a metal mold gravity casting method. After molten metal is poured into a metal mold under gravity, an extrusion rod is used at the position of a mould pouring cup to carry out vertical downward extrusion on a mould cavity, and molten metal solidifies, flows and takes shape under pressure. Solidified metal is subjected to plastic deformation under pressure, so that a casting is free of defects, such as shrinkage cavity and shrinkage porosity, and is fine in structure. Mechanical properties are improved, risers and machining allowance are reduced, and metal utilizing rate is high.
Description
Technical field
The invention belongs to metal mold gravity casting field, be specifically related to the casting method that the casting of a kind of metal gravity combines with extruding.
Background technology
Gravity casting refers to that molten metal injects the technique of casting mold under terrestrial gravitation effect, narrow justice generally refers to metal mold casting, mainly for the production of in non-ferrous metal, light casting.Metal liquid is cast under gravity, and filling velocity is slower, it is possible to reduce wrap up in the defect of gas, but complex thin wall castings there will be misrun defect.Metal liquid natural cooling in a mold shrinks, and cast structure is not fine and closely woven, shrinkage porosity defect of contraction cavity even occurs, and casting pressing port and allowance are relatively big, waste material.Being produced as example with the gravitational casting of electric bicycle, hub of motorcycle, adopt center casting, hub centre rising head is high, and wheel hub rim arranges riser feeding so that aluminum 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 problem existing for above metal mold gravity casting, the present invention proposes a kind of method of metal mold gravity casting: molten metal gravity casting is after metal type dies, use pressure ram that described mold cavity is extruded vertically downward in die pouring cup position, make liquid metals solidify under stress, flow forming, there is plastic deformation under stress in frozen metal, make foundry goods without defects such as shrinkage cavity and porosities, organize fine and closely woven, mechanical property improves, reducing rising head and allowance, using rate of metal is high.
The concrete grammar that the present invention proposes a kind of metal mold gravity casting is as follows:
(1), after metal type dies matched moulds, by molten metal gravity casting to described mould, after casting, molten metal liquid level not can exceed that the minimum necking down position of cup.
(2), after gravity casting terminates, adopt pressure ram that described mold cavity is extruded vertically downward in described cup position.Described pressure ram lower end diameter is identical with the minimum necking down of described cup, and middle-end diameter becomes big, identical with described cup interior shape, and restriction pressure ram can stretch into the depth capacity of described mold cavity.Described depth capacity is less than the height of cup position rising head.Described pressure ram moves downward, and keeps constant extruding force after entering described mold cavity, until can not continue to move downward.
(3) after casting solidification cooling, exiting described pressure ram from described mold cavity, foundry goods is taken out in die sinking.
The Advantageous Effects of the present invention:
After metal gravity casting, by described mold cavity is extruded, molten metal is made to solidify flow forming under stress, there is plastic deformation after solidification, it is possible to significantly increase the feeding effect of foundry goods, reduce rising head and allowance, improve using rate of metal, foundry goods is without shrinkage cavity and porosity defect simultaneously, organizes fine and closely woven, and performance improves.The present invention is simple to operate, and cost is low.
Detailed description of the invention
Be produced as example with the gravitational casting of aluminium alloy wheel hub, to a kind of metal mold gravity casting method provided by the invention be embodied as be described in detail.
(1), after metal type dies matched moulds, by molten metal gravity casting to described mould, after casting, molten metal liquid level not can exceed that the minimum necking down position of cup.
(2), after gravity casting terminates, adopt pressure ram that described mold cavity is extruded vertically downward in described cup position.Described pressure ram keeps constant extruding force after stretching into described mold cavity, until can not continue to move downward.Described pressure ram lower end diameter is identical with the described minimum necking down of cup 3, and middle-end diameter becomes big, identical with described cup interior shape, limits described pressure ram and can stretch into the depth capacity of described mold cavity.Described depth capacity is less than the height of aluminium alloy wheel hub center riser.
(3) after aluminium alloy wheel hub solidification cooling, exiting described pressure ram from described mold cavity, aluminium alloy wheel hub is taken out in die sinking.
Claims (6)
1. the method for a metal mold gravity casting, it is characterised in that molten metal gravity casting, after mould, adopts pressure ram vertically downward described mold cavity to be extruded in described die pouring cup position, until casting solidification cooling.
2. a kind of metal mold gravity casting method according to claim 1, it is characterised in that: after gravity casting, molten metal liquid level not can exceed that the minimum necking down position of described die pouring cup.
3. a kind of metal mold gravity casting method according to claim 1, it is characterised in that: described pressure ram is vertically into, after described mold cavity, keeping 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 characterised 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 characterised in that: described pressure ram middle-end diameter is bigger than lower end, identical with the interior shape of described die pouring cup.
6. a kind of metal mold gravity casting method according to claim 1, it is characterised in that: described pressure ram stretches into the depth capacity of described mold cavity and not can exceed that the height of described cup position casting pressing port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410741138.7A CN105710349A (en) | 2014-12-05 | 2014-12-05 | Metal mold gravity casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410741138.7A CN105710349A (en) | 2014-12-05 | 2014-12-05 | Metal mold gravity casting method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105710349A true CN105710349A (en) | 2016-06-29 |
Family
ID=56144338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410741138.7A Pending CN105710349A (en) | 2014-12-05 | 2014-12-05 | Metal mold gravity casting method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105710349A (en) |
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2014
- 2014-12-05 CN CN201410741138.7A patent/CN105710349A/en active Pending
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Legal Events
| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160629 |