CN106493295B - A kind of casting technique of large scale magnesium alloy flat structure part - Google Patents
A kind of casting technique of large scale magnesium alloy flat structure part Download PDFInfo
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- CN106493295B CN106493295B CN201611024803.6A CN201611024803A CN106493295B CN 106493295 B CN106493295 B CN 106493295B CN 201611024803 A CN201611024803 A CN 201611024803A CN 106493295 B CN106493295 B CN 106493295B
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- flat structure
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/088—Feeder heads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The present invention relates to the casting method of alloy workpiece, a kind of casting technique of large scale magnesium alloy flat structure part is disclosed, including Step 1: preparation before cast；Step 2: smelting and pouring；The step of further comprising, for example, casting method is sand casting, gravity-assist pouring, it is divided into two-part mo(u)lding and alloy melting up and down and uses flux method, gravity-assist pouring.The present invention realizes the high quality casting of large scale magnesium alloy flat structure part, and its indices reaches design requirement, achieves casting flawless, meets the beneficial effects such as I class castings desires without shrinkage cavity defect, internal soundness and fluoroscopic examination.
Description
Technical field
The present invention relates to a kind of casting technique of large scale magnesium alloy flat structure part, particularly directed to casting
Magnesium alloy structural part, by reasonably designing running gate system, feeding head, cast parameter, obtain high quality, zero defect casting.
Background technology
Compared with ferrous materials, cast magnesium alloy has that volume mass is small, specific strength is high, corrosion stability is good, machinability
The features such as energy is well and casting character is excellent.In order to mitigate construction weight on product, product performance is improved, it is more and more
Parts employ light material, application of the magnesium alloy in space flight and aviation is more and more extensive, large-scale magnesium alloy parts demand
Amount is also increasing.
For large-scale magnesium alloy flat structure part, its size is big, wall thickness is thin, and usually I classes casting, to the inside of casting
Quality requirement is high, the defects of owing casting, slag inclusion, crackle is easily being produced during castings production, qualification rate is low.Therefore, for
Large-scale magnesium alloy flat structure part, will obtain high quality casting, and the rational design of its casting technique is particularly significant.
In addition, for large-scale magnesium alloy flat structure part, its heat treatment deformation is also a problem, due to product size
Greatly, the phenomenon of warpage is easily produced in heat treatment process, is also difficult to ensure that whether final size is enough by correction.
The content of the invention
The problem of it is an object of the invention to overcome large-scale magnesium alloy flat structure part qualification rate low, pass through long-term life
Production practice and process summary, propose a kind of casting technique of flat structure part, can effectively solve the flat knot of large-scale magnesium alloy
Component easily produces the problem of owing the casting flaws such as casting, slag inclusion, crackle and its heat treatment deformation in process of production.
In order to reach foregoing invention purpose, the present invention is that technical scheme is to provide one kind used by solving its technical problem
The casting technique of large scale magnesium alloy flat structure part, comprises the following steps：
Step 1: the preparation before cast；
Using sand casting, gravity-assist pouring, it is divided into two-part mo(u)lding up and down；
Allowance is set in the upper plane of casting, lower plane sets allowance；
Running gate system uses running channel, and alloy can fully flow when being poured into a mould with guarantee；
Feeding head is set on casting angle, to ensure that heavy wall punch position is without casting flaw at this；
Feeding head is set in the junction of casting internal diameter, totally 8, is distributed on eight angles of casting, to ensure at this
Feeding effect；
Feeding head is set before the ingate of casting, to ensure the feeding effect at this；
L1 Shaped Iron Chills are set in the bottom surface at eight angles of casting, to improve the cooling velocity at the heavy wall；
Position before casting ingate sets chill before cast gate, to reduce the concentration of the heat before cast gate；
Bottom surface chill is set in casting lower surface, to ensure casting according to consecutive solidification in a manner of from the bottom up；
Step 2: smelting and pouring；
2.1 dispensing：With ZM6 alloys are taken, Nd amounts calculate with 2.5%, and Zn amounts calculate with 0.5%, and Zr amounts calculate with 1.0%, its
Remaining is magnesium amount, to check Fe, Si content：Fe ﹤ 0.01%, Si ﹤ 0.01%；
2.2 charging：Crucible is heated to 400 DEG C~500 DEG C, then adds flux, then furnace charge is added into crucible, is added
Expect order：Foundry returns → magnesium ingot of foundry returns → remelting of non-remelting；
2.3 heating：Aluminium alloy is melted and heated up, if pilot process has partial combustion, sprinkles flux, temperature liter immediately
Zn ingots, Mg-Nd intermediate alloys and Mg-Zr intermediate alloys are sequentially added during to 760 DEG C~780 DEG C；
2.4 refining：Aluminium alloy temperature is refined when dropping to 750 DEG C~770 DEG C with agitator；
2.5 stand：Aluminium alloy is warming up to 800 DEG C, poured into a mould after standing 8 minutes~10 minutes；
2.6 cast：Pouring temperature is 750 DEG C, cooling cast；
2.7 teeming rising heads：When aluminium alloy rises to 1/3rd height of rising head, with 730 DEG C of aluminium alloy teeming rising heads 1 time.
Large scale magnesium alloy flat structure part casting technique of the present invention, due to taking above-mentioned technological measure, is realized
The casting of large scale magnesium alloy flat structure part, its indices reach design requirement, achieve casting flawless, without shrinkage cavity
The beneficial effect such as defect, superior in quality.
Brief description of the drawings
Fig. 1 is the front view of large scale magnesium alloy flat structure part foundary methods drawing；
Fig. 2 is the B-B sectional views of large scale magnesium alloy flat structure part foundary methods drawing；
Fig. 3 is the A-A sectional views of large scale magnesium alloy flat structure part foundary methods drawing.
Embodiment
Illustrate the preferred embodiments of the present invention below in conjunction with the accompanying drawings.
Fig. 1 is the front view of large scale magnesium alloy flat structure part foundary methods drawing；Fig. 2 is the flat knot of large scale magnesium alloy
The B-B sectional views of component foundary methods drawing；Fig. 3 is the A-A sectional views of large scale magnesium alloy flat structure part foundary methods drawing.Figure
In 1 ~ 3：1st, structural member upper surface；2nd, structural member lower surface；3rd, structural member rib；4th, rising head M1；5th, rising head M2；6th, rising head M3；
7th, ingate；8th, cross gate；9th, sprue；10th, steel wool；11st, iron sheet screen pack；12nd, chill L1；13rd, chill L2；14th, it is cold
Iron L3
As shown in the figures above, the wheel of the maximum large scale magnesium alloy flat structure part of the inventive method casting to be used
Wide size is：1300×1000×80(mm)（Length × width × height）, it is flat structure part, and upper flat wall thickness is 6mm（In diagram
1）, lower plane wall thickness is 8mm（2 in diagram）, center section reinforcement is 6mm（3 in diagram）.
For above-mentioned castings desire without casting flaws such as shrinkage cavity, crackle, cold shuts, internal soundness reaches I classes casting in HB7780 will
Ask, casting carries out fluoroscopic examination.A kind of casting technique of large scale magnesium alloy flat structure part of the present invention is wanted according to above-mentioned
Ask, take following processing step：
Step 1: the preparation before cast
Before cast, technological design takes following measures：
1.1 casting methods are sand casting, gravity-assist pouring, are divided into two-part mo(u)lding up and down（See Fig. 1）；
1.2 set allowance 6mm in the upper plane of casting, and lower plane sets allowance 5mm；
1.3 Casting shrinkages are designed as 1.1%；
1.4 design pouring temperatures are 750 DEG C, ensure casting to fill type complete；
1.5 running gate systems use flat ingate 7, are each side there is 6, and are located at top box, to ensure to pour into a mould
Shi Hejin can fully flow, and will not cool down the too fast phenomenon for occurring owing casting because of molten metal, its size be 30 × 25 (mm) (it is wide ×
It is high)；
1.6 running gate systems use trapezoidal cross gate 8, be dimensioned to 40 × 35 × 40 (mm) (upper end × lower end ×
It is high)；
1.7 running gate systems use circular sprue 9, are dimensioned to 22mm, and gradient is 1 °.
1.8 set M1 feeding heads 4 on casting angle, to ensure at this heavy wall punch position without casting flaw, totally 8,
It is distributed on eight angles of casting, its size is 50mm（It is long）×60mm（It is wide）× 200mm (height), width gradient：6°；
1.9 set M2 feeding heads 5 in the junction of casting internal diameter, to ensure the feeding effect at this, avoid the occurrence of contracting
Hole shrinkage porosite, totally 4, its size is 80mm（It is long）×40mm（It is wide）× 200mm (height), width gradient：6°；
1.10 set M3 feeding heads 6 before the ingate of casting, to ensure the feeding effect at this, avoid due to cast gate
Preceding heat is high, at a temperature of slow down, produce shrinkage cavity shrinkage porosity, totally 12, its size is 100mm（It is long）×40mm（It is wide）×200mm
(height), width gradient：6°；
1.11 set L1 Shaped Iron Chills 12 in the bottom surface at eight angles of casting, to improve the cooling velocity at the heavy wall, avoid
The generation of casting flaw, thickness 20mm；
1.12 position before casting ingate 7 sets chill 13 before cast gate, to reduce the concentration of the heat before cast gate, avoids
The generation of shrinkage cavity shrinkage porosity, thickness 20mm；
1.13 set bottom surface chill 14 in casting lower surface 2, to ensure casting according to consecutive solidification in a manner of from the bottom up,
Ensure the internal soundness of casting, its thickness is 5mm；
1.14 set iron sheet screen pack 11 and steel wool 10, steel wool to be placed on directly in the trapezoidal cross gate 8 of running gate system
Position corresponding to running channel, screen pack are placed on the outside of steel wool, can play a part of good pushing off the slag.
Step 2: smelting and pouring；Further comprise the steps：
Alloy melting uses flux method, gravity-assist pouring
2.1 dispensing：With ZM6 alloys are taken, Nd amounts calculate with 2.5%, and Zn amounts calculate with 0.5%, and Zr amounts calculate with 1.0%, its
Remaining is magnesium amount, to check Fe, Si content：Fe ﹤ 0.01%, Si ﹤ 0.01%；
2.2 charging：Crucible is heated to 400 DEG C~500 DEG C, then adds flux, then furnace charge is added into crucible, is added
Expect order：Foundry returns → magnesium ingot of foundry returns → remelting of non-remelting；
2.3 heating：Aluminium alloy is melted and heated up, if pilot process has partial combustion, sprinkles flux, temperature liter immediately
Zn ingots, Mg-Nd intermediate alloys and Mg-Zr intermediate alloys are sequentially added during to 760 DEG C~780 DEG C；
2.4 refining：Aluminium alloy temperature is refined when dropping to 750 DEG C~770 DEG C with agitator.Method of refining：Vertical Square
Constantly refining agent is spread to drastically stirring up and down, during stirring on liquid stream crest.It is 15 minutes~20 minutes to stir the time；
2.5 stand：Aluminium alloy is warming up to 800 DEG C, poured into a mould after standing 8 minutes~10 minutes；
2.6 cast：Pouring temperature is 750 DEG C, cooling cast；
2.7 teeming rising heads：When aluminium alloy rises to 1/3rd height of rising head, with 730 DEG C of aluminium alloy teeming rising heads 1 time.
The specific embodiment of the present invention is described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring the substantive content of the present invention.
Claims (10)
1. a kind of casting technique of large scale magnesium alloy flat structure part, it is characterised in that comprise the following steps：
Step 1: the preparation before cast；
Using sand casting, gravity-assist pouring, it is divided into two-part mo(u)lding up and down；
Allowance is set in the upper plane of casting, lower plane sets allowance；
Running gate system uses running channel, and alloy can fully flow when being poured into a mould with guarantee；
Feeding head is set on casting angle, to ensure that heavy wall punch position is without casting flaw at this；
Feeding head is set in the junction of casting internal diameter, totally 8, is distributed on eight angles of casting, to ensure the feeding at this
Effect；
Feeding head is set before the ingate of casting, to ensure the feeding effect at this；
L1 Shaped Iron Chills are set in the bottom surface at eight angles of casting, to improve the cooling velocity at the heavy wall；
Position before casting ingate sets chill before cast gate, to reduce the concentration of the heat before cast gate；
Bottom surface chill is set in casting lower surface, to ensure casting according to consecutive solidification in a manner of from the bottom up；
Step 2: smelting and pouring；
2.1 dispensing：With ZM6 alloys are taken, Nd amounts calculate with 2.5%, and Zn amounts calculate with 0.5%, and Zr amounts calculate with 1.0%, and remaining is
Magnesium amount, to check Fe, Si content：Fe ﹤ 0.01%, Si ﹤ 0.01%；
2.2 charging：Crucible is heated to 400 DEG C~500 DEG C, then adds flux, then furnace charge is added into crucible, charging time
Sequence：Foundry returns → magnesium ingot of foundry returns → remelting of non-remelting；
2.3 heating：Aluminium alloy is melted and heated up, if pilot process has partial combustion, sprinkles flux immediately, temperature rises to 760
DEG C~780 DEG C when sequentially add Zn ingots, Mg-Nd intermediate alloys and Mg-Zr intermediate alloys；
2.4 refining：Aluminium alloy temperature is refined when dropping to 750 DEG C~770 DEG C with agitator；
2.5 stand：Aluminium alloy is warming up to 800 DEG C, poured into a mould after standing 8 minutes~10 minutes；
2.6 cast：Pouring temperature is 750 DEG C, cooling cast；
2.7 teeming rising heads：When aluminium alloy rises to 1/3rd height of rising head, with 730 DEG C of aluminium alloy teeming rising heads 1 time.
A kind of 2. casting technique of large scale magnesium alloy flat structure part as claimed in claim 1, it is characterised in that institute
State in step 1：Allowance 6mm is set in the upper plane of casting, lower plane sets allowance 5mm.
A kind of 3. casting technique of large scale magnesium alloy flat structure part as claimed in claim 1, it is characterised in that institute
State in step 1：Casting shrinkage is designed as 1.1%.
A kind of 4. casting technique of large scale magnesium alloy flat structure part as claimed in claim 1, it is characterised in that institute
State in step 1：It is 750 DEG C to design pouring temperature, ensure casting to fill type complete.
A kind of 5. casting technique of large scale magnesium alloy flat structure part as claimed in claim 1, it is characterised in that institute
State in step 1：Running gate system uses flat ingate, is each side there is 6, and is located at top box, with ensure cast when
Alloy can fully flow, and its size is wide × high：30mm×25mm.
A kind of 6. casting technique of large scale magnesium alloy flat structure part as claimed in claim 1, it is characterised in that institute
State in step 1：Running gate system uses trapezoidal cross gate, is dimensioned to upper end × lower end × high 40mm × 35mm × 40mm.
A kind of 7. casting technique of large scale magnesium alloy flat structure part as claimed in claim 1, it is characterised in that institute
State in step 1：Running gate system uses circular sprue, is dimensioned to 22mm, and gradient is 1 °.
A kind of 8. casting technique of large scale magnesium alloy flat structure part as claimed in claim 1, it is characterised in that institute
State in step 1：Feeding head is set on casting angle, its size is length × width × height 50mm × 60mm × 200mm, width side
To gradient：6°；In the junction of casting internal diameter, feeding head is set, its size is length × width × height 80mm × 40mm × 200mm,
Width gradient：6°；Feeding head is set before the ingate of casting, totally 12, its size be length × width × height 100mm ×
40mm × 200mm, width gradient：6°.
A kind of 9. casting technique of large scale magnesium alloy flat structure part as claimed in claim 1, it is characterised in that institute
State in step 1：In the bottom surface at eight angles of casting, L1 Shaped Iron Chills, thickness 20mm are set；Position before casting ingate is set
Put chill before cast gate, thickness 20mm；Bottom surface chill is set in casting lower surface, its thickness is 5mm；In the trapezoidal horizontal stroke of running gate system
Iron sheet screen pack and steel wool, steel wool is set to be placed on position corresponding to sprue in running channel, screen pack is placed on steel wool
Outside.
A kind of 10. casting technique of large scale magnesium alloy flat structure part as claimed in claim 1, it is characterised in that
In the step 2.4：Refining is drastically stirred up and down using vertical direction, is constantly spread refining agent on liquid stream crest during stirring, is stirred
The dynamic time is 15 minutes~20 minutes.
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| JPS5927750A (en) * | 1982-08-06 | 1984-02-14 | Toyota Motor Corp | Casting method of magnesium alloy |
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| CN1666830A (en) * | 2005-04-07 | 2005-09-14 | 中国南方航空动力机械公司 | Method for casting large-scale complex thin-wall Mg alloy castings |
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