CN104148612B - Feeder head coating structure and treatment method of aluminum alloy low-pressure cast - Google Patents
Feeder head coating structure and treatment method of aluminum alloy low-pressure cast Download PDFInfo
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- CN104148612B CN104148612B CN201410421149.7A CN201410421149A CN104148612B CN 104148612 B CN104148612 B CN 104148612B CN 201410421149 A CN201410421149 A CN 201410421149A CN 104148612 B CN104148612 B CN 104148612B
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- coating
- rising head
- feeder head
- refractory material
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Abstract
The invention relates to a feeder head coating structure and treatment method of an aluminum alloy low-pressure cast. The feeder head coating structure comprises a mold and a feeder head formed by a cavity in the mold. The feeder head is communicated with a mold cavity forming a cast body, and a sintered feeder head coating is arranged between the mold and the feeder head. The thicknesses, from the bottom of the feeder head to an opening, of the feeder head coating are gradually decreased to form a gradient. The feeder head coating with the gradient is adopted for making the coating at the bottom of the feeder head be thick, the thicknesses from the bottom of the feeder head to the opening are gradually decreased, in this way, the thermal insulation effect is excellent, molten metal at the bottom of the feeder head is prevented from solidifying firstly in the process of feeding, it can be effectively guaranteed that sufficient feeding is performed on the cast through the feeder head, the feeder head coating has certain surface strength and smoothness after sintering, the adhesion property of the coating on the mold is good, the combination between coatings is good, the possibility that in the casting process, the high-temperature molten aluminum erodes the coating is lowered, and the feeder head coating is effectively prevented from falling off in the process of cast stripping.
Description
Technical field
The present invention relates to metal-mold low-pressure casting field, more particularly, to a kind of aluminium alloy low pressure casting pressing port coating structure and
Processing method.
Background technology
Low pressure casting has been all at home and abroad ripe casting technique, and metal-mold low-pressure casting makes gold by external force effect
Belong to liquid to flow filling gold genotype die cavity coagulation forming against gravity direction.The method preparation cast(ing) surface have fineness good,
The advantages of consistency is high, mechanical property is good.
In low pressure casting often running gate system cannot feeding to foundry goods position adopt riser feeding, in current rising head
Coating treatment frequently with method be at rising head brushing one layer of heat preservation coating, at rising head coating refractory material, at rising head
Put the riser buss of shaping or fill insulation material at the rising head back side.
Brush one layer of fireproof coating in rising head, because coating is relatively thin, needed for heat insulation effect difficult to reach cast scene
Requiring, shrinkage porosite region being made when aluminium liquid pouring temperature is low to extend to foundry goods body thus leading to foundry goods to be scrapped.In rising head
Although brushing refractory material can obtain good feeding effect, due to refractory coating rough surface, aluminum in casting process
Liquid makes the coating in the rising head in the foundry goods demoulding drop to the etch of coating, makes rising head lose the feeding capacity to foundry goods.?
Although placing the riser buss shaping at rising head can solve the problems, such as that two methods lead to, there is difference due on single foundry goods
The rising head of shape, riser buss customized more difficult, pour into a mould every mould need to reappose riser buss, that is, increased cast-in-site operative employee
Sequence, increased production cost again.Insulation material is filled at the rising head back side, needs larger rising head, is affected sometimes by die size
Cannot realize.
Content of the invention
The purpose of the present invention is to overcome prior art defect, provides the firm aluminium alloy of a kind of high insulating effect, coating low
Die casting rising head coating structure and processing method.
The technical scheme of coating structure of the present invention is:
The rising head being formed including mould and cavity thereon, the mold cavity of rising head and formation foundry goods body communicates, described
Be provided with the rising head coating through oversintering between mould and rising head, thickness at rising head bottom to opening for the described rising head coating by
Decrescence little, form gradient.
Described rising head coating bottom thickness is 5～10mm.
Described rising head coating gradient is 30～60 °.
Described rising head coating includes number refractory material of a floor boning successively on mould and No. two refractory material of a floor,
A described refractory material and No. two refractory materials between form a floor transition zone through sintering.
The technical scheme of rising head Coating Processes of the present invention is: specifically includes following steps:
1) coat number refractory material of a floor at the rising head of mould, a refractory material is at rising head bottom to opening
Thickness is gradually reduced, and forms gradient；
2) processed with No. two refractory materials on the surface of a refractory material and uniformly brush flat；
3) mould is heated to 280～400 DEG C and is incubated 2～4h, form rising head coating.
A described refractory material is pasty state, and described No. two refractory materials are powdery.
The present invention relative to existing technologies, has a following beneficial technique effect:
The present invention using the rising head coating with gradient so that the thick coating of rising head bottom, at rising head bottom to opening
Thickness be gradually reduced, so heat insulation effect is excellent, prevents the molten metal of rising head bottom during feeding from first solidifying, can effectively protect
Card rising head abundant feeding to foundry goods, and rising head coating through oversintering so that rising head coating has certain surface strength and bright and clean
Degree, adhesion property on mould for the coating is good, and being well combined between coating is so that rising head coating will not take off in casting cycle
Fall, the etch to rising head coating for the casting process high temperature molten metal can be reduced, when effectively preventing the casting process medium casting demoulding again
Rising head coating shedding.
Further, rising head coating of the present invention adopts refractory material and its transition zone of two-layer mutually bonding, better ensures that
Coating layer thickness and surface evenness are so that better heat preservation；Transition zone enhances the adhesion between two-layer refractory material, has
Effect prevents coating shedding.
The present invention passes through to form coating using applied in two coats refractory material, and makes coating have gradient it is ensured that the present invention emits
Mouth coating has good heat insulation effect, improves rising head to the feeding effect during aluminium alloy low pressure casting pouring, and
Coating brush flat after handling process through oversintering, effectively improve the surface strength of rising head coating, reduce casting process high temperature aluminum
The etch to rising head coating for the liquid, effectively prevents rising head coating in casting process from coming off in the foundry goods demoulding.
Further, number refractory material of the present invention is pasty state, and No. two refractory materials are powdery so that in sintering process easily
Produce transition zone, strengthen the adhesion between two-layer refractory material, effectively prevent coating shedding.
Brief description
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the partial enlarged drawing of rising head and rising head coating at present invention p in FIG；
Wherein: 1- foundry goods body；2- rising head；3- rising head coating；4- mould；Number refractory material of 31-；No. bis- fire resistings of 32-
Material；33- transition zone.
Specific embodiment
Below in conjunction with the accompanying drawings the present invention is described in further details:
See figures.1.and.2, the present invention includes the rising head 2 that mould 4 and cavity thereon are formed, rising head 2 one face opening and and
The mold cavity forming foundry goods body 1 communicates, and is provided with the rising head coating 3 through oversintering between mould 4 and rising head 2, and rising head applies
Floor 3 includes number refractory material 31 of a floor mutually boning and No. two refractory material 32 of a floor, and a refractory material 31 is bonded in
It is gradually reduced to the thickness at opening on mould 4 and from rising head 2 bottom, form 30～60 ° of gradient, the coating layer thickness of its bottom
5～10mm；The transition zone 33 of two kinds of refractory material intermediate formation can increase the combination between two kinds of refractory materials simultaneously, effectively anti-
Only coating shedding.
The processing method of the present invention comprises the steps:
1) refractory material 31 of a floor pasty state, the surface shape of a refractory material 31 are coated at the rising head 2 of mould
Shape requires there is certain gradient, and bottom is thick, and surrounding is thin, is gradually reduced to the thickness at opening from rising head 2 bottom；
2) No. two refractory materials 32 in the surface powdery of a refractory material 31 process and uniformly brush flat；
3) mould is heated to 280～400 DEG C and is incubated 2～4h, form bottom thickness 5～10mm, there are 30～60 °
The rising head coating 3 of gradient.
The present invention passes through to form coating using applied in two coats refractory material, and makes coating have gradient it is ensured that the present invention emits
Mouth coating has good heat insulation effect, improves rising head to the feeding effect during aluminium alloy low pressure casting pouring, and
Coating brush flat after handling process through oversintering, effectively improve the surface strength of rising head coating, reduce casting process high temperature aluminum
The etch to rising head coating for the liquid, effectively prevents rising head coating in casting process from coming off in the foundry goods demoulding.Number fire resisting of the present invention
Material is pasty state, and No. two refractory materials are powdery so that easily producing transition zone in sintering process, strengthen two-layer refractory material it
Between adhesion, effectively prevent coating shedding.
By handling process of the present invention it is ensured that coating of the present invention is thicker, rising head has good heat insulation effect, improves and emits
Mouthful to the feeding effect during aluminium alloy low pressure casting pouring, and through oversintering, improve rising head coating surface strength and
Combination between fineness and enhancing coating, reduces the etch to rising head coating for the casting process high temperature aluminium liquid, effectively prevents
In casting process, rising head coating comes off in the foundry goods demoulding.
Claims (6)
1. a kind of aluminium alloy low pressure casting pressing port coating structure it is characterised in that: include mould (4) and cavity thereon formed
Rising head (2), the mold cavity of rising head (2) and formation foundry goods body (1) communicates, and is provided between described mould (4) and rising head (2)
Rising head coating (3) through oversintering, described rising head coating (3) is gradually reduced to the thickness at opening from rising head (2) bottom, is formed
Gradient.
2. a kind of aluminium alloy low pressure casting pressing port coating structure according to claim 1 it is characterised in that: described rising head applies
Layer (3) bottom thickness is 5～10mm.
3. a kind of aluminium alloy low pressure casting pressing port coating structure according to claim 1 it is characterised in that: described rising head applies
Layer (3) gradient is 30～60 °.
4. a kind of aluminium alloy low pressure casting pressing port coating structure according to claim 1-3 any one it is characterised in that:
Described rising head coating (3) includes number refractory material (31) of a floor boning successively on mould (4) and No. two fire proofed wood of a floor
Material (32), a described refractory material (31) and No. two refractory materials (32) between form a floor transition zone through sintering
(33).
5. a kind of aluminium alloy low pressure casting pressing port Coating Processes, specifically include following steps:
1) coat number refractory material (31) of a floor at rising head (2) place of mould (4), a refractory material (31) is from rising head (2)
Bottom is gradually reduced to the thickness at opening, forms gradient；
2) processed with No. two refractory materials (32) on the surface of a refractory material (31) and uniformly brush flat；
3) mould is heated to 280～400 DEG C and is incubated 2～4h, form rising head coating (3).
6. a kind of aluminium alloy low pressure casting pressing port Coating Processes according to claim 5 it is characterised in that: described one
Number refractory material (31) is pasty state, and described No. two refractory materials (32) are powdery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410421149.7A CN104148612B (en) | 2014-08-25 | 2014-08-25 | Feeder head coating structure and treatment method of aluminum alloy low-pressure cast |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410421149.7A CN104148612B (en) | 2014-08-25 | 2014-08-25 | Feeder head coating structure and treatment method of aluminum alloy low-pressure cast |
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| CN104148612A CN104148612A (en) | 2014-11-19 |
| CN104148612B true CN104148612B (en) | 2017-01-18 |
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| CN106493304A (en) * | 2016-10-18 | 2017-03-15 | 大亚车轮制造有限公司 | The preparation method of the metal sprue bush containing ceramic coating |
| CN112620589B (en) * | 2020-12-18 | 2023-02-21 | 陕西法士特汽车传动集团有限责任公司 | Riser bush and casting method based on riser bush |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0620585B2 (en) * | 1985-05-04 | 1994-03-23 | 旭テック株式会社 | Casting model and its manufacturing method |
| CN1071161C (en) * | 1999-01-18 | 2001-09-19 | 华中理工大学 | Metal-type top heat-conductive coating |
| CN2544862Y (en) * | 2002-05-22 | 2003-04-16 | 龙口市大川活塞有限公司 | Piston mould |
| JP3895251B2 (en) * | 2002-10-01 | 2007-03-22 | 日本鋳鉄管株式会社 | Hot casting member for centrifugal casting provided with a heat insulating layer and method for forming the heat insulating layer |
| CN200939499Y (en) * | 2006-08-07 | 2007-08-29 | 济南圣泉集团股份有限公司 | Novel heating and warming riser sleeve |
| CN204052858U (en) * | 2014-08-25 | 2014-12-31 | 陕西法士特汽车传动集团有限责任公司 | A kind of aluminium alloy low pressure casting pressing port coating structure |
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