CN107649652B - Using the complex-shaped surface mould aluminum casting manufacturing method of sand copper combination core - Google Patents
Using the complex-shaped surface mould aluminum casting manufacturing method of sand copper combination core Download PDFInfo
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- CN107649652B CN107649652B CN201710860950.5A CN201710860950A CN107649652B CN 107649652 B CN107649652 B CN 107649652B CN 201710860950 A CN201710860950 A CN 201710860950A CN 107649652 B CN107649652 B CN 107649652B
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- core
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
- B22C9/103—Multipart cores
Abstract
A kind of complex-shaped surface mould aluminum casting casting method using sand copper combination core is provided, corresponding sand core and copper core are made for cast aluminium product cavity structure division, and combination core is formed after completing combination and is put it into mold inner-cavity, related roasting type work is carried out by casting technique, aluminum water is poured into, die sinking, which takes out aluminium casting and removes outside, is stained with sand；Then so that sand is gone completely into loose sand aluminium casting heating, take out aluminium casting, then clear up the remaining sand in aluminium casting；Finally the aluminium casting cleared up is put into the concentrated nitric acid of room temperature and is impregnated, copper core is eroded, that is, completes the production with the aluminium casting of complex internal type chamber.The present invention combines coring processed using sand core and copper core, arbitrarily complicated shape can be produced with copper product and inner core small in size, it is not limited by sand core die joint, aluminium casting internal cavity size can be made to accomplish very little, regular shape and dimensional accuracy height, make especially suitable for complex-shaped surface mould aluminium casting inner core, reduce manufacture difficulty, working efficiency is improved, guarantees product quality.
Description
Technical field
The invention belongs to cast aluminium technical fields, and in particular to a kind of complex-shaped surface mould aluminum casting manufacturer using sand copper combination core
Method.
Background technique
Precoated sand, resin sand, water-glass sand production sand core is usually used in existing aluminium casting, and this sand core is generally minimum
Wall thickness can accomplish 3 millimeters or so, and shape is unable to too complex, if encountering complicated inner flow passage part, often incapability is
Power.With the development of technology, aluminum products part gradually develops to small and inner cavity complexity direction, and the connection runner of partial lumen is thick
Degree often at 3 millimeters hereinafter, and it is complex-shaped, form multiple curved shape, nonmetallic inner core manufacture difficulty is very big, and
Cause casting to be scrapped because casting impulse force is easy disconnected core when casting, causes product accident rate high.It is therefore desirable to propose to improve.
Summary of the invention
Present invention solves the technical problem that: a kind of complex-shaped surface mould aluminum casting manufacturing method using sand copper combination core is provided,
The present invention combines coring processed using sand core and copper core, with copper product can produce arbitrarily complicated shape and it is small in size in
Core is not limited by sand core die joint, and aluminium casting internal run-through cavity dimension can be made to accomplish very little, regular shape and size essence
Degree is high, especially suitable for the production of complex-shaped surface mould aluminium casting inner core, reduces manufacture difficulty, improves working efficiency, guarantees product
Quality.
The technical solution adopted by the present invention: the complex-shaped surface mould aluminum casting manufacturing method of core is combined using sand copper, including following
Step:
Step 1: corresponding copper core is made for cast aluminium interiors of products complex-shaped surface mould structure division；
Step 2: corresponding sand core is made for cast aluminium product cavity simple structure part, according to structure, is being made
During sand core, copper core described in step 1 is directly squeezed into sand core, makes to be integrally formed sand copper combination core；Alternatively, making
When sand core, connection shape corresponding with copper core described in step 1 and position are reserved in sand core internal, after sand core makes, by step
Copper core described in one is fixed together with the sand core made, is formed sand copper and is combined core；
Step 3: the combination core of sand copper described in step 2 is put into ready mold inner-cavity, is done by casting technique
Good related roasting type work, pours into aluminum water；
Step 4: after the workpiece solidification that sand copper combination core and mold in the step 3 are formed, aluminium casting is taken out in die sinking
Part, ball blast, which removes, is stained with sand outside aluminium casting；
Step 5: aluminium casting described in step 4 is heated to 300 degrees Celsius or more, heat preservation 1 hour or more, casts the aluminium
Core binder completely burnout inside part makes sand go completely into loose sand, takes out aluminium casting, then pass through vibration and the side removed
Method clears up the remaining sand in aluminium casting；
Step 6: the aluminium casting cleared up in the step 5 being put into the concentrated nitric acid of room temperature and is impregnated, copper core is eroded,
Complete the production with the aluminium casting of complex internal type chamber.
Wherein, the copper core in the step 1 is made of red copper.
Further, required knot is made in the mode that punching press of becoming a useful person can be used in the copper core in the step 1, machine adds or casts
Structure.
Further copper core, which is fixedly connected with position with the sand core made, in the step 2 is fixed by binder.
Further, sand is to complete on a vibration table inside the vibratory cleaning aluminium casting described in step 5, described
Removing sand inside aluminium casting is to purge to remove by high pressure draught.
Further soaking time can be according to the thickness and length of copper core in room temperature concentrated nitric acid for aluminium casting in the step 6
Degree determined within 2-12 hours.
Further, the concentrated nitric acid concentration in the step 6 is not less than 68%.
The present invention compared with prior art the advantages of:
1, this programme combines coring processed using sand core and copper core, with copper product can produce arbitrarily complicated shape and
Inner core small in size is not limited by sand core die joint, and aluminium casting internal run-through cavity dimension can be made to accomplish such as 0.2 milli of very little
Rice is thick, and regular shape and dimensional accuracy height provide conveniently to make aluminum casting small in size and inner cavity complexity, it is difficult to reduce manufacture
Degree guarantees product quality；
2, this programme can make sand core and copper core in advance, and finishing type core after the two group core is manufactured, core side under product is made
Just, convenient for manufacture, working efficiency is improved, reduces the volume and weight of product assembly.
Specific embodiment
The embodiment of the present invention is described below.
Using the complex-shaped surface mould aluminum casting manufacturing method of sand copper combination core, comprising the following steps:
Step 1: corresponding copper core is made for cast aluminium interiors of products complex-shaped surface mould structure division, copper core is preferably adopted
It is made of red copper, wherein punching press of becoming a useful person can be used in copper core, machine adds or required structure is made in the mode that casts, and processing method is more, adds
Work is convenient, reduces the difficulty that complex-shaped surface mould corresponds to core production；
Step 2: making corresponding sand core for cast aluminium product cavity simple structure part, according to structure, combines sand
Two methods can be used in core and copper core: one is during making sand core, copper core described in step 1 directly being squeezed into sand core
It is integrated, it forms sand copper and combines core, such as resin sand filled type, the copper core made is put into the position that sand mold mould is set,
Then back-up sand, after sand mold solidification, copper core and sand core are just solidified and are integrated, and here it is described to break into one；Another kind is making
When sand core, connection shape corresponding with copper core described in step 1 and position are reserved in sand core internal, after sand core makes, by step
Copper core described in one is fixed together with the sand core made, is formed sand copper and is combined core, copper core is fixedly connected with portion with sand core
Position is fixed by binder, to core drying for standby.During group core, a group core tooling completion group core can be used when necessary；
Step 3: the combination core of sand copper described in step 2 is put into ready mold inner-cavity, is done by casting technique
Good related roasting type work, pours into aluminum water；
Step 4: after the workpiece solidification of sand copper combination core in the step 3 and mould shape, aluminium casting is taken out in die sinking,
Sand is stained with outside ball blast removal aluminium casting；
Step 5: aluminium casting described in step 4 is heated to 300 degrees Celsius or more, heat preservation 1 hour or more, makes the aluminium
The core binder completely burnout of cast-internal, makes sand go completely into loose sand.According to different product, the time may have variation,
300 degrees Celsius or more can be sinterable by the coagulator of all sand molds, but when internal sand thickness is more thick and solid, heat-transfer rate is slow,
It is possible that local temperature is inadequate, the time need to be extended.Aluminium casting is taken out after sand is scattered, then clear by vibration and the method removed
Manage the remaining sand in aluminium casting, wherein sand is to complete on a vibration table inside the vibratory cleaning aluminium casting, the removing aluminium
Cast-internal sand is to purge to remove by high pressure draught；
Step 6: the aluminium casting cleared up in the step 5 is put into the concentrated nitric acid of room temperature and is impregnated, it is preferred that impregnated
Time can determine within 2-12 hours according to the thickness and length of copper core.Because aluminium casting in room temperature concentrated nitric acid surface formed it is blunt
Change film, and no longer and nitric acid reaction, and copper and nitric acid energy Fast Persistence react, and generate Cu (No3)2, it is soluble easily in water, therefore
Copper material inside aluminium casting is no longer sent out after the aluminium and concentrated nitric acid passivation reaction in type chamber because chemical reaction is completely dissolved in nitric acid
Biochemical reaction erodes copper core in this way, that is, completes the production with the aluminium casting of complex internal type chamber.Preferably, described dense
Concentration of nitric acid is not less than 68% (mass fraction).
The present invention combines coring processed using sand core and copper core, can produce arbitrarily complicated shape and body with copper product
The small inner core of product, can make aluminium casting through-lumen be shaped to arbitrary surface, such as be made into helicla flute, internal more bending knots
Structure, multiple spot run through the inner cavity of weave in, are not limited by sand core die joint, and its manufactured size precision is high；And it can
So that aluminium casting internal run-through cavity dimension accomplishes very little, such as the through-lumen of 0.2 millimeters thick, shape are extremely regular；The present invention
Especially suitable for production complex-shaped surface mould and the inner core of aluminium casting small in size, lower core is convenient, reduces the volume and again of product totality
Amount reduces manufacture difficulty, guarantees product quality, improves working efficiency.
Above-described embodiment, only presently preferred embodiments of the present invention, is not intended to limit the invention practical range, therefore all with this
The equivalence changes that content described in invention claim is done should all be included within scope of the invention as claimed.
Claims (4)
1. using the complex-shaped surface mould aluminum casting manufacturing method of sand copper combination core, it is characterised in that: the following steps are included:
Step 1: corresponding copper core is made for cast aluminium interiors of products complex-shaped surface mould structure division, the copper core is using purple
Copper is at punching press of becoming a useful person can be used in the copper core, machine adds or required structure is made in the mode that casts, and the red copper material can be made
It produces arbitrarily complicated shape and inner core small in size, is not limited by sand core die joint, make aluminium casting internal run-through cavity dimension
Minimum accomplishes 0.2 millimeter；
Step 2: making corresponding sand core for cast aluminium product cavity simple structure part, according to structure, in production sand core
In the process, copper core described in step 1 is directly squeezed into sand core, makes to be integrally formed sand copper combination core；Alternatively, in production sand core
When, connection shape corresponding with copper core described in step 1 and position are reserved in sand core internal, it, will be in step 1 after sand core makes
The copper core is fixed together with the sand core position made, is formed sand copper and is combined core；
Step 3: the combination core of sand copper described in step 2 is put into ready mold inner-cavity, carries out phase by casting technique
Roasting type work is closed, aluminum water is poured into；
Step 4: after the workpiece solidification that sand copper combination core and mold in the step 3 are formed, aluminium casting is taken out in die sinking, throws
Sand is stained with outside ball removal aluminium casting；
Step 5: aluminium casting described in step 4 is heated to 300 degrees Celsius or more, heat preservation 1 hour or more, is made in the aluminium casting
The core binder completely burnout in portion makes sand go completely into loose sand, takes out aluminium casting, then clear by vibration and the method removed
Manage the remaining sand in aluminium casting；Sand is to complete on a vibration table inside the vibratory cleaning aluminium casting, the removing aluminium casting
Internal sand is to purge to remove by high pressure draught；
Step 6: the aluminium casting cleared up in the step 5 being put into the concentrated nitric acid of room temperature and is impregnated, and erodes copper core, i.e., complete
At the production of the aluminium casting with complex internal type chamber.
2. the complex-shaped surface mould aluminum casting manufacturing method according to claim 1 using sand copper combination core, it is characterised in that:
Copper core, which is fixedly connected with position with the sand core made, in the step 2 is fixed by binder.
3. the complex-shaped surface mould aluminum casting manufacturing method according to claim 1 using sand copper combination core, it is characterised in that: institute
State in step 6 aluminium casting soaking time in room temperature concentrated nitric acid can be determined according to the thickness and length of copper core 2-12 hours with
It is interior.
4. the complex-shaped surface mould aluminum casting manufacturing method according to claim 1 or 3 using sand copper combination core, feature exist
In: the concentrated nitric acid concentration in the step 6 is not less than 68%.
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| CN201710860950.5A CN107649652B (en) | 2017-09-21 | 2017-09-21 | Using the complex-shaped surface mould aluminum casting manufacturing method of sand copper combination core |
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| CN107649652B true CN107649652B (en) | 2019-04-26 |
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| CN113390453A (en) * | 2020-03-12 | 2021-09-14 | 昆山市世达精密机械有限公司 | Aluminum casting machining method |
| CN113441686A (en) * | 2020-03-28 | 2021-09-28 | 昆山市世达精密机械有限公司 | Method for manufacturing aluminum casting with complex cavity |
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| GB549016A (en) * | 1941-04-30 | 1942-11-03 | Birmingham Aluminium Casting | Improved method of casting metal articles |
| CN201988681U (en) * | 2011-02-15 | 2011-09-28 | 深圳市建升精密五金有限公司 | Improvement of mould core material of deep hole mould |
| CN103056349A (en) * | 2013-01-09 | 2013-04-24 | 南昌航空大学 | Method for flowingly corroding complicated slender copper tube cores made of aluminum alloy castings |
| CN103639360A (en) * | 2013-11-25 | 2014-03-19 | 成都新航工业科技有限公司 | Method for carrying out plaster mould precise investment casting by utilizing copper pipes |
| CN104493143A (en) * | 2014-12-19 | 2015-04-08 | 中国南方航空工业(集团)有限公司 | Sand removal method for casts |
| CN105951050A (en) * | 2016-06-06 | 2016-09-21 | 中国工程物理研究院激光聚变研究中心 | Quick dissolving mold core capable of shortening removal time and using method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB549016A (en) * | 1941-04-30 | 1942-11-03 | Birmingham Aluminium Casting | Improved method of casting metal articles |
| CN201988681U (en) * | 2011-02-15 | 2011-09-28 | 深圳市建升精密五金有限公司 | Improvement of mould core material of deep hole mould |
| CN103056349A (en) * | 2013-01-09 | 2013-04-24 | 南昌航空大学 | Method for flowingly corroding complicated slender copper tube cores made of aluminum alloy castings |
| CN103639360A (en) * | 2013-11-25 | 2014-03-19 | 成都新航工业科技有限公司 | Method for carrying out plaster mould precise investment casting by utilizing copper pipes |
| CN104493143A (en) * | 2014-12-19 | 2015-04-08 | 中国南方航空工业(集团)有限公司 | Sand removal method for casts |
| CN105951050A (en) * | 2016-06-06 | 2016-09-21 | 中国工程物理研究院激光聚变研究中心 | Quick dissolving mold core capable of shortening removal time and using method thereof |
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| Title |
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| 铝合金壳体的细孔铸造工艺;武彬杰;《特种铸造及有色合金》;20080630;第28卷(第3期);第216-218页 |
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