CN102773409B - Method for manufacturing casting blank of die for inner containers of household appliances on basis of metal cavity with cold iron structure - Google Patents
Method for manufacturing casting blank of die for inner containers of household appliances on basis of metal cavity with cold iron structure Download PDFInfo
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- CN102773409B CN102773409B CN201210257721.1A CN201210257721A CN102773409B CN 102773409 B CN102773409 B CN 102773409B CN 201210257721 A CN201210257721 A CN 201210257721A CN 102773409 B CN102773409 B CN 102773409B
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Abstract
The invention discloses a method for manufacturing a casting blank of a die for inner containers of household appliances on the basis of a metal cavity with a cold iron structure, and relates to the technical field of aluminum alloy casting. The method includes particular steps of constructing an outer cavity by cold iron blocks on the periphery of a manufactured wood mold in a form following manner; filling gaps among the cold iron blocks by clay sand, tightly filling the corresponding cold iron blocks by clay sand after each local structure is completed, and compacting a sand mould to prevent the cold iron blocks from moving; constructing a sand core of an inner cavity by the same method after the outer cavity is constructed; opening a case to take out the wood mould after the sand core of the inner cavity is manufactured so that a cavity of a casting is formed; drying the cavity of the casting and the sand core consisting of clay sand; preheating the cavity of the casting at the preheating temperature of 200 DEG C before pouring of the cavity of the casting; casting melted aluminum alloy into the cavity of the casting; and opening the case to take out the casting after the cavity of the casting is cooled naturally. The method is mainly used for casting the die for the inner containers of the household appliances, the surface of a casting product produced by the process is high in smoothness and does not have sand holes or pin holes after the surface of the casting product is treated in a follow-up machining process, and accordingly yield of molded inner container products is greatly increased.
Description
Technical field:
The present invention relates to the aluminium alloy casting technology field, relate in particular to a kind of method of manufacturing household electrical appliances inner bag mould strand based on chill structure metal mold cavity.
Background technology:
Household electrical appliances inner bag mould is a kind of of vacuum plastics sucking moulding, and product requires very high to the fineness of mould surface.Surface quality and yield rate after the quality of mould surface directly has influence on inner bag and is shaped, therefore for liner forming mould, its forming surface roughness requires to be not more than Ra=0.8 μ m, and surfacing, smooth, without sand holes, pore-free.
At present, generally adopt greensand mold cast household electrical appliances inner bag mould, but large for the appearance profile size, interior cavity structure is more complicated and need to lay the inner bag mould of cooling water pipe, and while using full sand casting, die cavity is not easy finishing and the type that easily collapses.The sand mold heat transfer coefficient is less, and in die cavity, the metallic solution temperature is longer in time above liquidus, so metal alloy easily forms coarse grain, organizes shrinkage porosite in process of setting, has determined that to a certain extent the surface roughness of foundry goods post processing is higher.Simultaneously, easily occur shrinkage cavity and pore in cast product, cast(ing) surface easily produces sand holes and scab, therefore adopts sand casting inner bag mould yield rate lower.
For the inner texture of coarse crystal of refinement foundry goods, eliminate the casting flaw of cast(ing) surface, can adopt all-metal type cast mould, but all-metal type manufacturing cost is high, the production preparatory period is long, and metal mold processing time consuming, effort are produced heavy castings more difficult.Permanent mold casting is particularly suitable for larger, middle-size and small-size foundry goods in batches, and the inner bag mould is generally single-piece production, without the batch part, and casting dimension is larger, so use the metal mold production mould can reach the die surface quality requirement, but production cost is high, the cycle is long.From financial cost and technical difficulty, consider, all-metal type technique is not suitable for the manufacture of inner bag mould strand.
Summary of the invention:
Technical problem to be solved by this invention is to overcome the defect of prior art, provide a kind of chill structure that utilizes to be designed to the casting new method that metal mold cavity is manufactured household electrical appliances inner bag mould, to its objective is in order solving and to use sand casting inner bag mould yield rate low, die surface easily produces the various casting flaws such as pin hole, shrinkage porosite; While having avoided manufacturing and designing the all-metal type, the technological design difficulty is large simultaneously, and die manufacturing cost is high, produces the problem of heavy castings difficulty.
Technical problem to be solved by this invention realizes by the following technical solutions.
A kind of method of manufacturing household electrical appliances inner bag mould strand based on chill structure metal mold cavity, is characterized in that, concrete steps comprise:
A. at the die cavity outside the frozen iron blocks structure that utilizes of the peripheral conformal of the wooden model mould of making, frozen iron blocks is close to the mould outline, guarantees casting dimension accuracy;
B. the gap between frozen iron blocks place is filled up with clay-bonded sand, fill out tight frozen iron blocks with clay-bonded sand after completing the structure of a part, and the consolidation sand mold prevents the frozen iron blocks displacement at every turn;
C. after outer die cavity construction complete, use the same method and construct again interior die cavity core;
D. the interior die cavity core rear unpacking taking-up wooden model that completes, form the foundry goods die cavity;
E. the core of foundry goods die cavity and clay-bonded sand formation is dried, all contain moisture content in frozen iron blocks, clay-bonded sand, need to dry away moisture content, guarantee dry environment in casting mold, otherwise produce a large amount of steam or react and form pore, pin hole in foundry goods with steam during casting metal liquid;
F. before cast, also need the foundry goods die cavity is carried out to preheating, preheat temperature is 200 ℃;
G. melted aluminium alloy is poured in the foundry goods die cavity;
H. the taking-up foundry goods of can unpacking after naturally cooling.
The described frozen iron blocks back side is welded with T shape hook, strengthens the bonding strength of frozen iron blocks and sand mold, and when unpacking the taking-up wooden model, whole chill metal mold cavity can not misplace, and causes the mistake of cavity dimension like this.
During described aluminium alloy smelting, temperature of aluminum liquid is removed the gred while reaching 690 ℃, and the rotten temperature of processing is at 710 ℃, and the temperature of blowing refining is at 730 ℃, and the aluminium liquid after refining was skimmed after standing a period of time, and aluminium liquid pouring temperature is controlled at 720 ℃.
The cast product of producing under this technique is highly polished through following process processing rear surface, without the existence of sand holes, pin hole, thereby the inner bag product percent of pass after moulding is significantly improved.
Beneficial effect of the present invention is: 1. the quality of cast product and qualification rate improve greatly, because outer die cavity adopts the metal mold of frozen iron blocks structure, aluminium alloy is full of cast(ing) surface consecutive solidification under the iron chill shock chilling effect after die cavity, the cast(ing) surface setting rate is accelerated, dendrite has little time to grow up, so what obtain is tiny, fine and close crystalline structure; The crystal grain of foundry goods is thinner, and the inferior looks between crystallographic axis, shrinkage porosite, pore are got over disperse, even not there will be casting flaw; Chill has increased the thermograde of process of setting, has strengthened the feeding effect of rising head; Under the effect of chill, the metallic inclusion on crystal boundary and impurity disperse distribute simultaneously, thereby have improved mechanical property; So the quality of production and the qualification rate of cast product are improved to a great extent.
2. the free degree of frozen iron blocks design is high, can be according to inner bag mould local form design frozen iron blocks, shape-designing is convenient and swift, improved production efficiency, utilize the outer die cavity of frozen iron blocks structure metal to overcome sand mold and be difficult for the difficulty of repairing, save the high cost of manufacturing all-metal mould, reduced production cost, improved economic benefit.
3. the raising casting accuracy, reduced reserved processing capacity, reduces strand weight and reach 15% left and right; Use the outer die cavity of chill can improve casting accuracy, can produce the foundry goods of the various models of size of shape and structure complexity, can make the casting dimension Deviation Control between ± 0.5mm.
4. casting Technology Design is flexible, can change the thermograde of process of setting according to selection chill working surface area and the position of casting section thickness flexible in size, forms the order that solidifies of consecutive solidification.
5. molding sand can be repeatedly used, and can reduce the molding sand consumption, has reduced raw-material consumption, has reduced production cost.
The accompanying drawing explanation:
The structural representation that Fig. 1 is wooden model in the present invention;
The schematic diagram that Fig. 2 is the outer die cavity of frozen iron blocks structure.
The specific embodiment:
For technological means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
As shown in Figure 1 and Figure 2, a large aluminum alloy template class strand is manufactured by pre-buried stainless steel pipes technique, and specific implementation method is as follows:
1. complete the threedimensional model design of inner bag product based on computer aided design software CAD MBM; According to inner bag foundry goods X-Y scheme, utilize the biasing surface order by machined surface biasing thickening, the allowance of fast automatic interpolation foundry goods; Take out for the ease of wooden model 6, need to carry out the withdrawing pattern processing to foundry goods, will note during withdrawing pattern: size two ends, withdrawing pattern place size conforms part tolerance; Make wall thickness as far as possible evenly or thickness be more or less the same, drafting angle is generally got 1 ° of left and right.
2. according to wooden model design processing technology, utilize the dividing body order, 3D solid step designed in 1. with each datum level rationally splits accurately; To guarantee during fractionation that the sheet number is more few better, get the raw materials ready according to splitting the body wooden model, complete the assembly of wooden model mould.
3., after design determines running gate system 1, the wooden model 6 that the step of take assembles in 2., for basic, carries out moulding in sandbox 3; Around wooden model 6 outlines conformal lay frozen iron blocks 4, the T shape hook 5 of frozen iron blocks 4 back sides welding has been strengthened the bonding strength of frozen iron blocks 4 with core 2; More complicated when the mould local feature, in the time of can not constructing die shape with the rectangle chill, need to design and manufacture separately the conformal frozen iron blocks; After the good outer die cavity of structure, die cavity core and running gate system 1 in manufacturing; After completing moulding work, unpack and take out wooden model 6, carry out the cleaning of die cavity.
4. die cavity has been cleared up and rear metal mold cavity and core has been dried, the moisture content of going out wherein.Before cast, it is carried out to preheating, preheat temperature is generally 200 ℃, guarantees environment dry in casting mold.
Above demonstration and described basic principle of the present invention, principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; that in above-described embodiment and specification, describes just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (3)
1. a method of manufacturing household electrical appliances inner bag mould strand based on chill structure metal mold cavity, is characterized in that, concrete steps comprise:
A. at the die cavity outside the frozen iron blocks structure that utilizes of the peripheral conformal of the wooden model mould made; B. the gap between frozen iron blocks place is filled up with clay-bonded sand, fill out tight frozen iron blocks with clay-bonded sand after completing the structure of a part, and the consolidation sand mold prevents the frozen iron blocks displacement at every turn;
C. after outer die cavity construction complete, use the same method and construct again interior die cavity core;
D. the interior die cavity core rear unpacking taking-up wooden model that completes, form the foundry goods die cavity;
E. the core of foundry goods die cavity and clay-bonded sand formation is dried;
F. before cast, also need the foundry goods die cavity is carried out to preheating, preheat temperature is 200 ℃;
G. melted aluminium alloy is poured in the foundry goods die cavity;
H. the taking-up foundry goods of can unpacking after naturally cooling.
2. the method for manufacturing household electrical appliances inner bag mould strand based on chill structure metal mold cavity according to claim 1, it is characterized in that: the described frozen iron blocks back side is welded with T shape hook.
3. the method for manufacturing household electrical appliances inner bag mould strand based on chill structure metal mold cavity according to claim 1, it is characterized in that: during described aluminium alloy smelting, temperature of aluminum liquid is removed the gred while reaching 690 ℃, the rotten temperature of processing is at 710 ℃, the temperature of blowing refining is at 730 ℃, aluminium liquid after refining was skimmed after standing a period of time, and aluminium liquid pouring temperature is controlled at 720 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210257721.1A CN102773409B (en) | 2012-07-24 | 2012-07-24 | Method for manufacturing casting blank of die for inner containers of household appliances on basis of metal cavity with cold iron structure |
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| CN201210257721.1A CN102773409B (en) | 2012-07-24 | 2012-07-24 | Method for manufacturing casting blank of die for inner containers of household appliances on basis of metal cavity with cold iron structure |
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| CN102773409A CN102773409A (en) | 2012-11-14 |
| CN102773409B true CN102773409B (en) | 2014-01-01 |
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| CN103658504B (en) * | 2013-11-26 | 2016-06-29 | 滁州金诺实业有限公司 | The technique of sand-cast aluminium alloy strand |
| CN104801667B (en) * | 2013-12-31 | 2017-05-17 | 中国航空工业集团公司沈阳飞机设计研究所 | Method for preventing generation of casting crack of high temperature alloy mold |
| CN104493103B (en) * | 2014-12-15 | 2016-08-17 | 滁州金诺实业有限公司 | The sand casting household electrical appliances pre-buried technique of die for inner water pipe |
| CN104525857B (en) * | 2014-12-15 | 2016-07-13 | 滁州金诺实业有限公司 | Inner container of icebox mould box structure is cast based on V method |
| CN104525855B (en) * | 2014-12-15 | 2016-09-07 | 滁州金诺实业有限公司 | Metal mold technique based on V method casting inner container of icebox mould strand |
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| CN104525858B (en) * | 2014-12-15 | 2016-11-30 | 滁州金诺实业有限公司 | Vacuum pressing and casting electronic appliance mold aluminium alloy castings built-in pipe technique |
| CN104525856B (en) * | 2014-12-15 | 2016-07-06 | 滁州金诺实业有限公司 | Inner container of icebox mould top box formative technology is cast based on V method |
| CN106141106A (en) * | 2015-03-31 | 2016-11-23 | 株式会社日立制作所 | The coating method of the coating of metal casting mould and this metal casting mould |
| CN104826986A (en) * | 2015-04-20 | 2015-08-12 | 鞍山千钢机械制造有限公司 | Method used for preventing sand adhesion of sand mould castings, and sand mould prefabricated components |
| CN104999059A (en) * | 2015-07-20 | 2015-10-28 | 柳州市建西机械铸造厂 | Heat treatment process of cast parts |
| CN105081214A (en) * | 2015-08-31 | 2015-11-25 | 苏氏精密制造技术（北京）股份有限公司 | Casting method |
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| CN107661967A (en) * | 2017-11-25 | 2018-02-06 | 山西江淮重工有限责任公司 | Aluminium copper structural member casting internal densener structure and its laying method |
| CN109434062A (en) * | 2018-11-23 | 2019-03-08 | 中船海洋动力部件有限公司 | For improving the dark chill and its laying method of cast structure nodularization |
| CN110918923B (en) * | 2019-12-03 | 2021-05-25 | 兰州高压阀门有限公司 | Casting process of sequential directional solidification double-layer conical shell structure casting |
| CN113996754B (en) * | 2021-10-22 | 2023-07-28 | 共享装备股份有限公司 | Sand mould for casting and application thereof |
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Patent Citations (5)
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| JPS58119434A (en) * | 1982-01-08 | 1983-07-15 | Eagle Ind Co Ltd | Sliding material for mechanical seal |
| CN1907597A (en) * | 2006-08-22 | 2007-02-07 | 沪东重机股份有限公司 | Casting method for exhaust branch pipe of thin-wall ball iron triplet |
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