CN104525855A - Metal-type process of casting blank for refrigerator inner liner mold on the basis of V-process casting - Google Patents
Metal-type process of casting blank for refrigerator inner liner mold on the basis of V-process casting Download PDFInfo
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- CN104525855A CN104525855A CN201410778854.2A CN201410778854A CN104525855A CN 104525855 A CN104525855 A CN 104525855A CN 201410778854 A CN201410778854 A CN 201410778854A CN 104525855 A CN104525855 A CN 104525855A
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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
- B22C9/03—Sand moulds or like moulds for shaped castings formed by vacuum-sealed moulding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
- B22C15/28—Compacting by different means acting simultaneously or successively, e.g. preliminary blowing and finally pressing
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Abstract
The invention discloses a metal-type process of a casting blank for a refrigerator inner liner mold on the basis of V-process casting, and relates to a new process adopting a vacuum casting process as the basis and combing the characteristics of marketing products. The metal-type process aims at solving the problems that the finished-product rate of the mold of the inner liner cast by using a sand mold is low, and various casting defects, such as needle holes and shrinkage, are easy to generate on the surface of the mold; simultaneously, the problems of large difficulty of process design in designing and manufacturing all-metal type, high mold-manufacturing cost and difficulty in producing large casting pieces are avoided.
Description
Technical field
The present invention relates to casting technology field, be specifically related to a kind of metal mold technique based on V method casting inner container of icebox mould strand.
Background technology
Household electrical appliances die for inner is the one of vacuum plastics sucking moulding, and product is very high to the smoothness requirements of mould surface.The quality of mould surface directly have influence on inner bag be shaped after surface quality and yield rate, therefore for liner forming mould, its forming surface roughness requirements is not more than Ra=0.8 μm, and surfacing, smooth, without sand holes, pore-free.
At present, general adopt Sand Moulding Process casting household electrical appliances die for inner, but large for appearance profile size, and interior cavity structure is more complicated and need the die for inner of laying cooling water pipe, and when using full sand casting, die cavity is not easy finishing, and the type that easily collapses.Sand mold heat transfer coefficient is less, and in die cavity, to be in time above liquidus longer for metallic solution temperature, so metal alloy easily forms coarse grain, organizes shrinkage porosite in process of setting, the surface roughness determining foundry goods post processing is to a certain extent higher.Meanwhile, easily occur shrinkage cavity and pore in cast product, cast(ing) surface easily produces sand holes and scab, therefore adopts sand casting die for inner yield rate lower.
In order to refinement cast-internal texture of coarse crystal, eliminate the casting flaw of cast(ing) surface, all-metal type cast mould can be adopted, but all-metal type manufacturing cost is high, the Operational preparation cycle is long, metal mold processing time consuming, effort, produces heavy castings more difficult.Permanent mold casting is particularly suitable for larger, the middle-size and small-size foundry goods of batch, and die for inner is generally single-piece production, without batch part, and casting dimension is larger, so use metal mold production mould can reach die surface quality requirement, but production cost is high, and the cycle is long.Consider from financial cost and technical difficulty, all-metal type technique is not suitable for the manufacture of die for inner strand.
Summary of the invention
It is higher that technical problem to be solved by this invention is to provide a kind of mechanization degree, reduces labour intensity, the metal mold technique based on V method casting inner container of icebox mould strand of improving the quality of products.
Technical problem to be solved by this invention realizes by the following technical solutions:
Based on a metal mold technique for V method casting inner container of icebox mould strand, comprise following processing step:
A) complete the threedimensional model design of inner bag product based on computer aided design software, carry out pretreatment according to inner bag foundry goods X-Y scheme to inner bag product threedimensional model, its content comprises: the interpolation of Mechanical processing of casting surplus, and the design of casting technique;
B) based on the design of concave-convex mold somatotype and other running gate system inside and outside computer aided design software, specifically comprise: sprue, cross gate, ingate, rising head equidimension size and position, the design of steam vent and pre-buried water pipe tube seat, PROCESS FOR TREATMENT is carried out to model simultaneously, as increased drafting angle, design Splicing model, and process two punch models;
C) model mould assembling and putting, according to sandbox size, selects appropriate punch model, it is similar that the selection of model will follow shape, the principle that draw ratio is close, especially can not put together highly differing too large model, putting on same template by punch location;
D) make disposable die: cover sandbox with the punch be well placed, make disposable die, then die body is taken out, and then take out after the loose piece breakage of model, shape and the film of sand mold can not be destroyed.So just make a disposable die;
E) frozen iron blocks design and put, the heat storage coefficient of cast iron chill is comparatively large, can absorb more heat, have stronger Quench ability, simultaneously cast iron cold iron easy to make, with low cost, be widely used, so select casting pig as frozen iron blocks material in this casting technique;
Die for inner foundry goods profile is generally the polygon of rule, and therefore conventional frozen iron blocks is designed to rectangular block, and its worksheet size is designed to three types:
No. 1 specification 200mm × 400mm;
No. 2 specification 100mm × 150mm;
No. 3 specification 50mm × 100mm;
Frozen iron blocks leads circle while carry out limit, and the large I of fillet carries out processing and fabricating as required, and frozen iron blocks surface roughness is at about Ra12.5; When pouring into a mould light-alloy, chill thickness δ=(1.0 ~ 2.0) D, D is foundry goods conformal wall thickness; Household electrical appliances die for inner wall thickness is generally about 15mm, so frozen iron blocks thickness is taken as 25mm, needs to design and manufacture frozen iron blocks separately, facilitate moulding when mould local form is more complicated, guarantees the accurate of cavity dimension and shape;
Frozen iron blocks structure casting mold punch profile is put at the inwall conformal of die, frozen iron blocks is close to disposable die Internal periphery, ensure casting dimension accuracy, gap place dry sand between frozen iron blocks is filled up, fill out tight frozen iron blocks with sand after completing the structure of a local, and consolidation sand mold prevents frozen iron blocks to be shifted at every turn, be welded with T-shaped hook at the chill back side, strengthen the bonding strength of frozen iron blocks and sand mold, whole chill metal mold cavity can not misplace and come off;
After the inner good chill of cloth of punch and dry sand, whole sandbox puts plain bumper jolt ramming, is then vacuumized by top box, and pastes on top box by the form film of disposable die, and negative pressure of vacuum cancelled by nowel, then descends box disintegration, now obtains the punch with chill;
F) making of die, the making of die is comparatively simple compared to punch, first corresponding model is placed on template according to symmetrical structure, location wants accurately, then to carry out overlay film to model and vacuumize, the same with punch after overlay film completes, suitable chill is selected to be close to around model, then back-up sand consolidation, vacuumizes, and takes out model;
G) melting of aluminium alloy, temperature of aluminum liquid reasonably will be controlled well during aluminium alloy smelting, general temperature of aluminum liquid removes the gred when reaching 690 DEG C, the temperature of Metamorphism treatment is at about 700-750 DEG C, the temperature of blowing refining is at 700-750 DEG C, skim after aluminium liquid after refining leaves standstill a period of time, last aluminium liquid pouring temperature controls at about 700-750 DEG C.
H) foundry goods is unpacked after naturally cooling and is taken out foundry goods, and the cast product produced under this technique is highly polished through following process process rear surface, without the existence of sand holes, pin hole, thus significantly improves the inner bag product percent of pass after shaping.
The invention has the beneficial effects as follows:
1) have employed the mode of vacuum pressing and casting, mechanization degree is higher, reduces labour intensity.Tradition foundry casting adopts manual work, and this invention is based upon on the basis of mechanization vacuum pressing and casting, and labour intensity is low, is applicable to modernization industry Production requirement.
2) casting flaw of foundry goods is reduced, the quality of production and the qualification rate of cast product improve greatly, chill process for cooling and vacuum casting process combine by the present invention, because outer die cavity adopts the metal mold of frozen iron blocks structure, aluminium alloy is full of cast(ing) surface consecutive solidification under iron chill shock chilling effect after die cavity, cast(ing) surface setting rate is accelerated, and dendrite has little time to grow up, so what obtain is tiny, fine and close crystalline structure.
3) secondary formative technology achieves the moulding of complicated shape, general complicated shape because cannot the demoulding problem and cannot realize, the present invention make use of secondary moulding, decomposes the method for disposable die cavity, achieves the moulding of complex-shaped surface mould.
4) vacuum casting process is adopted to improve casting accuracy, decrease reserved processing capacity, because vacuum pressing and casting is higher compared to the stability of manual casting, compared to traditional 4mm allowance, what model adopted is numerical control moulding process, within surplus is reduced to 2mm, achieves minimizing strand processing weight and reach about 50%.
5) due to vacuum pressing and casting employing is dry sand casting, and moisture-free in sand, can reduce the quality problems such as sand holes, bubble caused because of steam greatly.
6) vacuum pressing and casting does not need to use a large amount of paint, and the chemicals such as resin glue, decreases a large amount of gaseous contaminations.
7) utilize vacuum pressing and casting to produce product, in the process of cast, pernicious gas is all extracted in discharge duct, substantially improves the working environment in workshop, decreasing pollution.
Detailed description of the invention
The technological means realized to make the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with specific embodiment, setting forth the present invention further.
1. the threedimensional model design of inner bag product is completed based on computer aided design software CAD MBM.Biasing surface order is utilized to thicken biased for machined surface according to inner bag foundry goods X-Y scheme, the allowance of fast automatic interpolation foundry goods and other necessary sized, the die then utilizing polyurethane foamed material to process to design and punch model.
2. first die model is fixed on positioning mould board, and then the profile of model puts the chill of suitable dimension, between chill, leave certain gap, negative pressure ventilation when conveniently vacuumizing, while put chill limit to add sand, convenient fixing chill position.
3. because the model of punch is comparatively complicated, direct processing spill cannot moulding, and the shaping concave shape that cannot process complexity of numerical control, so for the box casting of complexity, adopt the method for secondary moulding, directly process the punch shape of needs, then this punch vacuum moulding is utilized to go out a die, then on die, be well placed the running gate system of design, running gate system will wrap up plastic sheeting, simultaneously on the inwall of die, while put chill limit to add sand, negative-pressure pipeline is put into matrix simultaneously, to increase moulding intensity, after adding sand, be put into plain bumper jolt ramming, then extrusion forming.
4. the model of upper nowel is sprayed, dry, then carry out mould assembling cast.Attention: should intensified negative pressure degree when cast, in order to avoid the type that collapses.When pouring into a mould, aluminium alloy solution temperature controls, at about 700 DEG C, to complete cast at the appointed time.
5. adopt the method to produce household electrical appliances die for inner strand, technique is advanced, and casting yield is high, and surface quality of continuous castings reaches unprecedented height.
More than show and describe general principle of the present invention and 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; what describe in above-described embodiment and description 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.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (1)
1., based on a metal mold technique for V method casting inner container of icebox mould strand, it is characterized in that, comprise following processing step:
A) complete the threedimensional model design of inner bag product based on computer aided design software, according to inner bag foundry goods X-Y scheme, pretreatment is carried out to inner bag product threedimensional model;
B) based on the design of concave-convex mold somatotype and other running gate system inside and outside computer aided design software, specifically comprise: sprue, cross gate, ingate, Riser Dimensions size and position, the design of steam vent and pre-buried water pipe tube seat, carries out PROCESS FOR TREATMENT to model simultaneously;
C) model mould assembling and putting, according to sandbox size, selects appropriate punch model, it is similar that the selection of model will follow shape, the principle that draw ratio is close, especially can not put together highly differing too large model, putting on same template by punch location;
D) make disposable die: cover sandbox with the punch be well placed, make disposable die, then die body is taken out, and then take out after the loose piece breakage of model, shape and the film of sand mold can not be destroyed;
E) frozen iron blocks design and put, the heat storage coefficient of cast iron chill is comparatively large, can absorb more heat, have stronger Quench ability; Frozen iron blocks leads circle while carry out limit, and the large I of fillet carries out processing and fabricating as required;
Frozen iron blocks structure casting mold punch profile is put at the inwall conformal of die, frozen iron blocks is close to disposable die Internal periphery, ensure casting dimension accuracy, gap place dry sand between frozen iron blocks is filled up, fill out tight frozen iron blocks with sand after completing the structure of a local, and consolidation sand mold prevents frozen iron blocks to be shifted at every turn, be welded with T-shaped hook at the chill back side, strengthen the bonding strength of frozen iron blocks and sand mold, whole chill metal mold cavity can not misplace and come off;
After the inner good chill of cloth of punch and dry sand, whole sandbox puts plain bumper jolt ramming, is then vacuumized by top box, and pastes on top box by the form film of disposable die, and negative pressure of vacuum cancelled by nowel, then descends box disintegration, now obtains the punch with chill;
F) making of die: first corresponding model is placed on template according to symmetrical structure, location is wanted accurately, then carry out overlay film to model to vacuumize, it is the same with punch after overlay film completes, suitable chill is selected to be close to around model, then back-up sand consolidation, vacuumizes, and takes out model;
G) melting of aluminium alloy, temperature of aluminum liquid reasonably will be controlled well during aluminium alloy smelting, temperature of aluminum liquid removes the gred when reaching 690 DEG C, the temperature of Metamorphism treatment is at 700-750 DEG C, the temperature of blowing refining is at 700-750 DEG C, skim after aluminium liquid after refining leaves standstill a period of time, last aluminium liquid pouring temperature controls at 700-750 DEG C;
H) foundry goods is unpacked after naturally cooling and is taken out foundry goods.
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| CN201410778854.2A CN104525855B (en) | 2014-12-15 | 2014-12-15 | Metal mold technique based on V method casting inner container of icebox mould strand |
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| CN201410778854.2A CN104525855B (en) | 2014-12-15 | 2014-12-15 | Metal mold technique based on V method casting inner container of icebox mould strand |
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| CN104525855A true CN104525855A (en) | 2015-04-22 |
| CN104525855B CN104525855B (en) | 2016-09-07 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104985124A (en) * | 2015-06-05 | 2015-10-21 | 苏州华冲精密机械有限公司 | Novel aluminum alloy plastic uptake mold preparation method |
| CN105312496A (en) * | 2015-12-07 | 2016-02-10 | 河北安迪模具有限公司 | V-process moulding teeming line |
| CN106180568A (en) * | 2016-09-07 | 2016-12-07 | 滁州市鑫鼎机械模具制造有限公司 | A kind of metal mold technique casting inner container of icebox mould strand |
| CN106180569A (en) * | 2016-09-07 | 2016-12-07 | 滁州市鑫鼎机械模具制造有限公司 | A kind of casting inner container of icebox mould top box formative technology |
| CN107052262A (en) * | 2016-12-29 | 2017-08-18 | 滁州鑫诺实业有限公司 | A kind of V method model casting techniques for casting electronic appliance mold complex class base |
| CN109128028A (en) * | 2018-10-29 | 2019-01-04 | 扬州广润机械有限公司 | A kind of casting technique solving magnesium iron vibration motor end cap casting shrinkage porosity defect of contraction cavity |
| CN114985699A (en) * | 2022-05-30 | 2022-09-02 | 共享装备股份有限公司 | Method for marking cold iron position by using process plate and process plate |
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| CN102773409A (en) * | 2012-07-24 | 2012-11-14 | 滁州金诺实业有限公司 | Method for manufacturing casting blank of die for inner containers of household appliances on basis of metal cavity with cold iron structure |
| CN103658526A (en) * | 2013-11-26 | 2014-03-26 | 滁州金诺实业有限公司 | Technology utilizing cooled vacuum molding to obtain refrigerator inner container template aluminium alloy cast |
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| JPS5280219A (en) * | 1975-12-27 | 1977-07-05 | Teruo Uehara | Ship body casting method |
| CN1759953A (en) * | 2005-10-27 | 2006-04-19 | 贾林夫 | Molding method for manufacturing ingot mold through vacuseal molding machine |
| CN102773409A (en) * | 2012-07-24 | 2012-11-14 | 滁州金诺实业有限公司 | Method for manufacturing casting blank of die for inner containers of household appliances on basis of metal cavity with cold iron structure |
| CN103658526A (en) * | 2013-11-26 | 2014-03-26 | 滁州金诺实业有限公司 | Technology utilizing cooled vacuum molding to obtain refrigerator inner container template aluminium alloy cast |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104985124A (en) * | 2015-06-05 | 2015-10-21 | 苏州华冲精密机械有限公司 | Novel aluminum alloy plastic uptake mold preparation method |
| CN105312496A (en) * | 2015-12-07 | 2016-02-10 | 河北安迪模具有限公司 | V-process moulding teeming line |
| CN106180568A (en) * | 2016-09-07 | 2016-12-07 | 滁州市鑫鼎机械模具制造有限公司 | A kind of metal mold technique casting inner container of icebox mould strand |
| CN106180569A (en) * | 2016-09-07 | 2016-12-07 | 滁州市鑫鼎机械模具制造有限公司 | A kind of casting inner container of icebox mould top box formative technology |
| CN107052262A (en) * | 2016-12-29 | 2017-08-18 | 滁州鑫诺实业有限公司 | A kind of V method model casting techniques for casting electronic appliance mold complex class base |
| CN109128028A (en) * | 2018-10-29 | 2019-01-04 | 扬州广润机械有限公司 | A kind of casting technique solving magnesium iron vibration motor end cap casting shrinkage porosity defect of contraction cavity |
| CN114985699A (en) * | 2022-05-30 | 2022-09-02 | 共享装备股份有限公司 | Method for marking cold iron position by using process plate and process plate |
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| CN104525855B (en) | 2016-09-07 |
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