CN103182480B - Gravity casting process for engine cylinder cover - Google Patents
Gravity casting process for engine cylinder cover Download PDFInfo
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- CN103182480B CN103182480B CN201110457838.XA CN201110457838A CN103182480B CN 103182480 B CN103182480 B CN 103182480B CN 201110457838 A CN201110457838 A CN 201110457838A CN 103182480 B CN103182480 B CN 103182480B
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- core
- sand core
- water jacket
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Abstract
The invention discloses a gravity casting process for an engine cylinder cover. The gravity casting process comprises a molding step, a casting step and a mold opening step. A mold used for gravity casting the engine cylinder cover obtained after the molding step is finished comprises a bottom mold, an air inlet side mold, an air exhaust side mold, a front mold, a rear mold and a water jacket sand core, wherein the bottom mold, the air inlet side mold, the air exhaust side mold, the front mold and the rear mold enclose a swage mold of the mold; a mold cavity of the swage mold is provided with the water jacket sand core; a mold cavity of the mold is disposed between the lower surface of the water jacket sand core and the bottom surface of the mold cavity; the water jacket sand core is provided with a plurality of sand core air inlets penetrating through the water jacket sand core up and down and a plurality of sand core air outlets penetrating through the water jacket sand core up and down; the upper surface of the water jacket sand core is provided with a sand core cavity; and the sand core cavity is provided with a sand core cover plate for closing the sand core cavity.
Description
Technical field
The present invention relates to a kind of engine cylinder cover gravity casting technique.
Background technology
Engine cylinder cover is the critical component of engine, and its outline is for being about 400mm × 170mm × 120mm.Client is high to casting dimension precision prescribed, flat appearance, clear-cut are complete; Cast-internal dense structure, the casting flaw such as pore-free, shrinkage porosite; Requirement castings material is alusil alloy, tensile strength >=235Mpa that material is corresponding, extends >=1, and requires No leakage under 2bar air pressure; Again because foundry goods uniform wall thickness is interval at 4-5mm, but there is the isolated thick large shape and structure of many places Wall-Thickness Difference more than 2 times; And jacket core gas forming amount is large, and due to structure restriction, cannot effectively be vented, it is comparatively large therefore to cast difficulty, easily produces pore and shrinkage defect, and the unreasonable of sand core of water jacket design in this and casting die has much relations.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, providing a kind of engine cylinder cover casting process, it is by reducing the capacity of sand core of water jacket, thus the high quality of production of engine cylinder cover foundry goods in ground.
A kind of technical scheme realizing above-mentioned purpose is: a kind of engine cylinder cover gravity casting technique, comprising: molding step, casting step and die sinking step;
After described molding step completes the mould obtained for engine cylinder cover gravity casting comprise: bed die, air inlet side form, exhaust side form, front end mould, rear end mould and sand core of water jacket, described bed die, described air inlet side form, described exhaust side form, described front end mould and described rear end mould surround the pattern of described mould, placing sand core of water jacket in the die cavity of described pattern, is the die cavity of described mould between the lower surface of described sand core of water jacket and the bottom surface of described die cavity;
Described sand core of water jacket arranges and somely runs through the core air admission hole of described sand core of water jacket and some core steam vents running through described sand core of water jacket up and down up and down, the upper surface of described sand core of water jacket arranges core cavity, described core cavity arranges core end cap, described core cavity is closed.
Further, on described sand core of water jacket, described core cavity is between described core air admission hole and described core steam vent.
Further, state mould and also comprise mould bases, described bed die is arranged on described mould bases, and described mould bases arranges guide rail, and described air inlet side form and described exhaust side form are arranged on described guide rail, and can along described guide rail slippage.
Further, described die sinking step is undertaken by mobile described air inlet side form and described exhaust side form.
Further, described front end mould arranges cup, and described cup connects described die cavity by rising head, in casting step, molten metal pours in described cup, and described molten metal is through described rising head, enter in described die cavity, and cooled and solidified is shaping in described die cavity.
Further, described pattern is made up of metal material, before described sand core of water jacket (7) puts into the die cavity die cavity of described pattern, and the preheating at 200 DEG C-350 DEG C of described pattern, and remove the rusty stain of described cavity surface, and at the surface of described die cavity coating releasing agent.
Further, arrange some blind holes in the bottom surface of described bed die, arrange cooling body in described blind hole, described cooling body is exported by cooling medium inlet, cooling medium runner and cooling medium and forms, and described cooling medium inlet connects water source or air compressor
Further, between the sidewall of described cooling body and described blind hole, thermal insulation layer is set.
Have employed the technical scheme of a kind of engine cylinder cover gravity casting technique of the present invention, namely arrange core cavity at the upper surface of described sand core of water jacket, described core cavity arranges core cover plate, described core cavity is closed by described core cover plate.Its technique effect is: in the process of producing shape and structure intricate casting, reduce the capacity of sand core of water jacket, foundry goods is avoided to produce the defect such as pore, pine contracting, improve product percent of pass, simultaneously improving work situation condition, reduce the labour intensity of operating personnel, improve production efficiency.
Accompanying drawing explanation
Fig. 1 is the structural representation of the pattern used in a kind of engine cylinder cover gravity casting technique of the present invention;
Fig. 2 is the structural representation of the sand core of water jacket used in a kind of engine cylinder cover gravity casting technique of the present invention;
Fig. 3 is the bottom surface structure schematic diagram of the bed die used in a kind of engine cylinder cover gravity casting technique of the present invention.
Detailed description of the invention
Refer to Fig. 1 to Fig. 2, in order to understand technical scheme of the present invention better, below by embodiment particularly, and be described in detail by reference to the accompanying drawings:
A kind of engine cylinder cover gravity casting technique of the present invention comprises molding step, cast step and die sinking step;
Described molding step comprises: make pattern operation, make sand core of water jacket operation and core setting.
Refer to Fig. 1, in described making pattern operation, use metal material to make bed die 1, air inlet side form 2, exhaust side form 3, front end mould 4 and rear end mould 5 respectively.Again described bed die 1, described air inlet side form 2, described exhaust side form 3, described front end mould 4 and described rear end mould 5 are surrounded described pattern, the inside of described pattern is the die cavity of described pattern.Described bed die 1 is fixed on a die holder 6, described die holder 6 arranges guide rail 61, described air inlet side form 2 and described exhaust side form 3 are arranged on described guide rail 61, in die sinking process, described air inlet side form 2 and described exhaust side form slide in the opposite direction along guide rail described in 3, complete described die sinking step.
In this external described making sand core of water jacket operation, at the upper surface of described sand core of water jacket 7, a core cavity 73 is set, described core cavity 73 arranges core end cap 74, the size of described core end cap 74 is mated with the size of described core cavity 73, and described core cavity 73 is closed by described core end cap 74.
In the present embodiment, described state sand core of water jacket 7 arranges somely run through the core air admission hole 71 of described sand core of water jacket 7 and some core steam vents 72 running through upper and lower described sand core of water jacket 7 up and down, described core cavity 73 and described core cover plate 74 are between described core air admission hole 71 and described core steam vent 72.
The object that described sand core of water jacket 7 arranges described core cavity 73 and described core cover plate 74 is: in the process of producing shape and structure intricate casting, reduce the capacity of sand core of water jacket, foundry goods is avoided to produce the defect such as pore, pine contracting, improve product percent of pass, simultaneously improving work situation condition, reduce the labour intensity of operating personnel, improve production efficiency.
Described sand core of water jacket 7 makes to obtain in special metal die, the bottom surface of the die cavity of described metal die arranges boss, the position of described boss is corresponding with the position of described core cavity 73, before the described sand core of water jacket 7 of making, described metal die wants first preheating on heated by natural gas utensil, and the temperature of preheating is 220 DEG C-400 DEG C.Then in described metal die, insert particle diameter at 50-100 object precoated sand, complete the making of described sand core of water jacket 7, while the described sand core of water jacket 7 of making, make described core cover plate 74, finally described core cover plate 74 is covered on described core cavity 73.
Before carrying out that described sand core of water jacket 7 is put into the core setting of the die cavity of described pattern, described pattern to be carried out preheating on heated by natural gas utensil, the temperature of preheating is 220 DEG C-350 DEG C, simultaneously, the rusty stain of cavity surface, remaining coating and other foreign material are removed, simultaneously at the surface of described die cavity coating releasing agent with jetting tool.
In core setting, describedly state the one side described die cavity bottom surface dorsad that sand core of water jacket 7 is provided with described core cavity 73 and described core cover plate 74, place upward, therefore upper surface is called, described sand core of water jacket 7 is smooth, the surface not being provided with described core cavity 73 and described core cover plate 74 side is placed downwards towards the bottom surface of described die cavity, therefore becomes lower surface, the bottom surface of described die cavity i.e. the end face of described bed die 1.The die cavity 8 of the mould for end cover of engine gravity casting used in a kind of engine cylinder cover casting process of the present invention is formed between the bottom surface of described die cavity and described sand core of water jacket 7.Described front end mould 4 arranges a cup 41, described cup 41 is communicated with described die cavity 8 by rising head simultaneously.
Described casting step comprises melting operation, cast operation and cooling forming operation
In described casting step, the molten metal being used for casting is alusil alloy molten metal, the melt temperature of described alusil alloy molten metal is 730 DEG C-750 DEG C, then also will through refining, degasification, slagging-off, the purified treatment such as aluminium liquid process such as rotten, in the hope of obtaining, there is highly purified alusil alloy molten metal, completing described melting operation.
The temperature of the molten metal of alusil alloy described in casting step is 720-730 DEG C.Described alusil alloy molten metal enters described die cavity 8 from the described rim of a cup 41 that waters through described rising head, completes described cast operation, and within the time of 200 seconds cooled and solidified, become engine cylinder cover foundry goods, complete described molding procedure.
An other improvement in a kind of engine cylinder cover casting process of the present invention is: the bottom surface of described bed die 1 arranges some blind holes 11, cooling body 12 is set in described blind hole, described cooling body exports 123 by cooling medium inlet 121, cooling medium runner 122 and cooling medium and forms, and described cooling medium inlet 121 connects water source or air compressor.
The object of such design is: improve the Quench ability with die cavity thermal center 81 correspondence position of described die cavity 8 on described bed die 1, solves isolated thick large wall construction place on foundry goods and organizes the problem of shrinkage porosite.Shape and structure can be produced complicated and there is the foundry goods of better quality.As engine cylinder cap etc.
Between the sidewall of described blind hole 11 and described cooling body 12, thermal insulation layer 13 is set, described thermal insulation layer 13 can be asbestos material, like this at described cooling body 12 to when described bed die 1 cools with die cavity thermal center 81 correspondence position of described die cavity 8, other position on described bed die 1 is not had an impact.
Between described cooling body 12 and the diapire of described blind hole 11, seal washer 14 is set, makes between described cooling body 12 and described blind hole 11 fixing.Be fixed on supplementary for described cooling body 12 on the bottom surface of described bed die 1 by bolt 15 simultaneously.
Described cooling body 12 connects thermocouple, and connect LPC interface controller by described thermocouple, by described LPC interface controller, control described water or compressed-air actuated flow, make the temperature with die cavity thermal center 81 correspondence position of described die cavity 8 on described bed die 1,50 DEG C are no more than with the temperature difference of described other position of bed die 1
Be finally die sinking step, namely by oppositely moving described air inlet side form 2 and exhaust side form 3, complete die sinking, completing described die sinking operation; Cast gate again on engine cylinder cover foundry goods described in place to go and rising head, complete and remove dead head operation, and described cast gate and described rising head refer to the clout at rising head place described in the cup 41 that described foundry goods corresponds to described mould; It is remove sand core of water jacket operation that frame gets off, and finally described engine cylinder cover foundry goods is carried out to the finishing step of the fine finishining process such as polishing finishing and shotblasting, finally obtains engine cylinder cover.
Those of ordinary skill in the art will be appreciated that, above embodiment is only used to the present invention is described, and be not used as limitation of the invention, as long as in spirit of the present invention, all will drop in Claims scope of the present invention the change of the above embodiment, modification.
Claims (7)
1. an engine cylinder cover gravity casting technique, comprising: molding step, casting step and die sinking step:
After described molding step completes the mould obtained for engine cylinder cover gravity casting comprise: bed die (1), air inlet side form (2), exhaust side form (3), front end mould (4), rear end mould (5) and sand core of water jacket (7), described bed die (1), described air inlet side form (2), described exhaust side form (3), described front end mould (4) and described rear end mould (5) surround the pattern of described mould, sand core of water jacket (7) is placed in the die cavity of described pattern, it is the die cavity (8) of described mould between the lower surface of described sand core of water jacket (7) and the bottom surface of described die cavity, it is characterized in that:
Described sand core of water jacket (7) arranges and somely runs through the core air admission hole (71) of described sand core of water jacket (7) and some core steam vents (72) running through described sand core of water jacket up and down up and down, the upper surface of described sand core of water jacket (7) arranges core cavity (73), described core cavity (73) arranges core end cap (74), described core cavity (73) is closed;
In the bottom surface of described bed die (1), some blind holes (11) are set, cooling body (12) is set in described blind hole (11), described cooling body (12) exports (123) by cooling medium inlet (121), cooling medium runner (122) and cooling medium and forms, and described cooling medium inlet (121) connects water source or air compressor;
Described cooling body (12) connects thermocouple, and connect LPC interface controller by described thermocouple, by described LPC interface controller, control water or compressed-air actuated flow, make the temperature with die cavity thermal center (81) correspondence position of described die cavity (8) on described bed die (1), be no more than 50 DEG C with the temperature difference of described bed die (1) other position.
2. a kind of engine cylinder cover gravity casting technique according to claim 1, it is characterized in that: on described sand core of water jacket (7), described core cavity (73) is positioned between described core air admission hole (71) and described core steam vent (72).
3. a kind of engine cylinder cover gravity casting technique according to claim 1 and 2, it is characterized in that: described mould also comprises mould bases (6), described bed die (1) is arranged on described mould bases (6), described mould bases (6) is arranged guide rail (61), described air inlet side form (2) and described exhaust side form (3) are arranged on described guide rail (61), and can along described guide rail (61) slippage.
4. a kind of engine cylinder cover gravity casting technique according to claim 3, is characterized in that: described die sinking step is undertaken by mobile described air inlet side form (2) and described exhaust side form (3).
5. a kind of engine cylinder cover gravity casting technique according to claim 1 and 2, it is characterized in that: cup (41) is set on described front end mould (4), described cup (41) connects described die cavity (8) by rising head, in casting step, molten metal pours in described cup (41), described molten metal is through described rising head, enter in described die cavity (8), and cooled and solidified is shaping in described die cavity (8).
6. a kind of engine cylinder cover gravity casting technique according to claim 1 and 2, it is characterized in that: described pattern is made up of metal material, before described sand core of water jacket (7) puts into the die cavity die cavity of described pattern, the preheating at 200 DEG C-350 DEG C of described pattern, and remove the rusty stain of described cavity surface, and at the surface of described die cavity coating releasing agent.
7. a kind of engine cylinder cover gravity casting technique according to claim 1, is characterized in that: arrange thermal insulation layer (13) between the sidewall of described cooling body (12) and described blind hole (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110457838.XA CN103182480B (en) | 2011-12-31 | 2011-12-31 | Gravity casting process for engine cylinder cover |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110457838.XA CN103182480B (en) | 2011-12-31 | 2011-12-31 | Gravity casting process for engine cylinder cover |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103182480A CN103182480A (en) | 2013-07-03 |
| CN103182480B true CN103182480B (en) | 2015-07-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110457838.XA Active CN103182480B (en) | 2011-12-31 | 2011-12-31 | Gravity casting process for engine cylinder cover |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104722715B (en) * | 2015-04-15 | 2016-09-14 | 温州瑞明工业股份有限公司 | A kind of heater of cylinder head casting rising head |
| CN105397027A (en) * | 2015-12-02 | 2016-03-16 | 株洲中航动力精密铸造有限公司 | Casting method of casting |
| CN105855473B (en) * | 2016-05-27 | 2018-10-19 | 江铃汽车股份有限公司 | Engine cylinder body core assembling technology, Engine cylinder body sand core and sand core group |
| CN105880475B (en) * | 2016-06-21 | 2017-11-10 | 王仙寿 | Engine cylinder cover casting mould |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8332318D0 (en) * | 1983-12-02 | 1984-01-11 | Austin Rover Group | Cylinder head |
| JPH11229955A (en) * | 1998-02-13 | 1999-08-24 | Daihatsu Motor Co Ltd | Cylinder head structure in internal combustion engine |
| CN2923109Y (en) * | 2006-07-13 | 2007-07-18 | 广西玉柴机器股份有限公司 | Casting mould of diesel engine cylinder lid |
| CN201380269Y (en) * | 2009-04-09 | 2010-01-13 | 江苏万盛铸造有限公司 | Core making die for cylinder head water jacket of multi-cylinder diesel engine |
| CN201543775U (en) * | 2009-11-13 | 2010-08-11 | 广西玉柴机器股份有限公司 | Casting mold of water jacket core of cylinder cover |
| CN201684893U (en) * | 2010-02-25 | 2010-12-29 | 芜湖市金贸流体科技股份有限公司 | Diesel engine cylinder water jacket core casting mold |
| CN201669411U (en) * | 2010-05-07 | 2010-12-15 | 宁波强盛机械模具有限公司 | Cooling device of aluminum alloy metal type casting die |
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2011
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