CN104525855B - Metal mold technique based on V method casting inner container of icebox mould strand - Google Patents

Metal mold technique based on V method casting inner container of icebox mould strand Download PDF

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Publication number
CN104525855B
CN104525855B CN201410778854.2A CN201410778854A CN104525855B CN 104525855 B CN104525855 B CN 104525855B CN 201410778854 A CN201410778854 A CN 201410778854A CN 104525855 B CN104525855 B CN 104525855B
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casting
die
punch
iron blocks
sand
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CN104525855A (en
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陈敏
李健
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CHUZHOU JINNUO INDUSTRIAL Co Ltd
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CHUZHOU JINNUO INDUSTRIAL Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C9/00Moulds or cores; Moulding processes
    • B22C9/02Sand moulds or like moulds for shaped castings
    • B22C9/03Sand moulds or like moulds for shaped castings formed by vacuum-sealed moulding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C15/00Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/28Compacting by different means acting simultaneously or successively, e.g. preliminary blowing and finally pressing

Abstract

The invention discloses a kind of metal mold technique based on V method casting inner container of icebox mould strand, it is a kind of based on vacuum casting process, combine the new technology of market product feature, its purpose is to solve to use sand casting die for inner yield rate low, die surface easily produces the various casting flaw such as pin hole, shrinkage porosite.Avoiding technological design difficulty when manufacturing and designing all-metal type big, die manufacturing cost is high simultaneously, the problem producing heavy castings difficulty.

Description

Metal mold technique based on V method casting inner container of icebox mould strand
Technical field
The present invention relates to casting technology field, be specifically related to a kind of based on V method casting inner container of icebox mould strand Metal mold technique.
Background technology
Household electrical appliances die for inner is the one of vacuum plastics sucking moulding, and the fineness of mould surface is wanted by product Ask the highest.The quality of mould surface directly influences the surface quality after inner bag shapes and yield rate, because of This is for liner forming mould, and its forming surface roughness requirements is not more than Ra=0.8 μm, and surfacing, Smooth, without sand holes, pore-free.
At present, the general Sand Moulding Process casting household electrical appliances die for inner that uses, but for appearance profile size greatly, Interior cavity structure is more complicated and needs to lay the die for inner of cooling water pipe, die cavity when using full sand casting It is not easy finishing, and the type that easily collapses.Sand mold heat transfer coefficient is less, and in die cavity, metallic solution temperature is in Time above liquidus is longer, so metal alloy is easily formed coarse grain, tissue contracting in process of setting Pine, the surface roughness determining foundry goods post processing to a certain extent is higher.Meanwhile, in cast product Shrinkage cavity and pore easily occur, cast(ing) surface is easily generated sand holes and scab, therefore uses sand casting inner bag Mould yield rate is relatively low.
In order to refine cast-internal texture of coarse crystal, eliminate the casting flaw of cast(ing) surface, can use All-metal type cast mould, but all-metal type manufacturing cost is high, and the Operational preparation cycle is long, metal Type processing time consuming, laborious, produce heavy castings more difficult.Permanent mold casting be particularly suitable for batch the biggest, Middle-size and small-size foundry goods, and die for inner is usually single-piece production, without batch part, and casting dimension is relatively big, institute To use metal mold production mould can reach die surface quality requirement, but production cost is high, the cycle Long.Considering from financial cost and technical difficulty, all-metal type technique is not suitable for the system of die for inner strand Make.
Summary of the invention
The technical problem to be solved is to provide a kind of mechanization degree higher, reduces work strong Degree, improves the metal mold technique based on V method casting inner container of icebox mould strand of product quality.
The technical problem to be solved realizes by the following technical solutions:
A kind of metal mold technique based on V method casting inner container of icebox mould strand, comprises the technical steps that:
A) complete the threedimensional model design of inner bag product based on computer aided design software, cast according to inner bag Inner bag product threedimensional model is pre-processed by part X-Y scheme, and its content includes: adding of Mechanical processing of casting surplus Add, and the design of casting technique;
B) inside and outside concave-convex mold parting based on computer aided design software and the design of other running gate system, Specifically include: sprue, cross gate, ingate, rising head equidimension size and location, steam vent and The design of pre-buried water pipe tube seat, carries out PROCESS FOR TREATMENT to model simultaneously, and as increased drafting angle, design is spelled Connect pattern, and process two punch models;
C) model mould assembling and putting, according to sandbox size, selects appropriate punch model, model Selection shape to be followed is similar, the principle that draw ratio is close, especially can not be model the biggest for height difference Put together, punch location is put to same template;
D) disposable die is made: cover sandbox with the punch being well placed, make disposable die, then By die body take out, the most again will after the loose piece breakage of model take out, it is impossible to destroy sand mold shape and Film.Thus make a disposable die;
E) design of frozen iron blocks and putting, the heat storage coefficient of cast iron chill is relatively big, can absorb more heat Amount, has stronger Quench ability, and cast iron cold iron is easy to make, with low cost simultaneously, be widely used, So selecting casting pig as frozen iron blocks material in this casting technique;
The polygon of die for inner foundry goods profile generally rule, therefore commonly uses frozen iron blocks and is designed as rectangular block, Its worksheet area is sized so as to three types:
No. 1 specification 200mm × 400mm;
No. 2 specification 100mm × 150mm;
No. 3 specification 50mm × 100mm;
Frozen iron blocks is while carrying out limit rounding, and the big I of fillet is processed making as required, frozen iron blocks table 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 when mould local form is more complicated individually designed to produce frozen iron blocks, facilitates moulding, really Protect the accurate of cavity dimension and shape;
Inwall conformal at die puts frozen iron blocks structure casting mold punch profile, and frozen iron blocks is close to the most recessed Mould Internal periphery, it is ensured that casting dimension accuracy, fills up with dry sand at the gap between frozen iron blocks, the completeest Fill out tight frozen iron blocks with sand after becoming the structure of a local, and consolidation sand mold prevents frozen iron blocks from shifting, at chill The back side is welded with T-shaped hook, strengthens the bonding strength of frozen iron blocks and sand mold, and whole chill metal mold cavity will not Dislocation comes off;
After the internal good chill of cloth of punch and dry sand, whole sandbox puts plain bumper jolt ramming, is then taken out very by top box Sky, and the form film of disposable die is pasted on top box, nowel cancels negative pressure of vacuum, then under Box disintegration, now obtains the punch with chill;
F) making of die, the making of die is relatively simple compared to punch, is first pressed by corresponding model It is placed on template according to symmetrical structure, is positioned to accurately, then model be carried out overlay film and vacuumize, cover Film is the same with punch after completing, and selects suitable chill to be close to around model, and then back-up sand consolidation is taken out Vacuum, takes out model;
G) melting of aluminium alloy, reasonably to control temperature of aluminum liquid well during aluminium alloy smelting, general aluminium liquid temperature Degree reach to remove the gred when 690 DEG C, the temperature of Metamorphism treatment at about 700-750 DEG C, the temperature of blowing refining Degree is at 700-750 DEG C, and the aluminium liquid after refining is skimmed after standing a period of time, and last aluminium liquid pouring temperature controls At about 700-750 DEG C.
H) unpacking after foundry goods cools down naturally and take out foundry goods, the cast product produced under this technique is through follow-up Working process rear surface is highly polished, without sand holes, the existence of pin hole, thus to the inner bag product after shaping Qualification rate is greatly improved.
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 founding Casting uses manual work, and this invention is set up on the basis of mechanization vacuum pressing and casting, and labour intensity is low, It is suitable for modernization industry Production requirement.
2) reducing the casting flaw of foundry goods, the quality of production and the qualification rate of cast product are greatly improved, this Chill is cooled down technique in item invention and vacuum casting process combines, because outer die cavity uses frozen iron blocks structure The metal mold made, aluminium alloy is full of cast(ing) surface consecutive solidification, foundry goods under iron chill shock chilling effect after die cavity Surface solidification speed is accelerated, and dendrite has little time to grow up, so obtain is tiny, fine and close crystalline structure.
3) secondary formative technology achieves the moulding of complicated shape, and general complicated shape is because cannot the demoulding Problem and cannot realize, the present invention make use of secondary moulding, the method decomposing disposable die cavity, it is achieved The moulding of complex-shaped surface mould.
4) use vacuum casting process can improve casting accuracy, decrease reserved processing capacity, because vacuum Casting higher compared to the stability of manual casting, compared to traditional 4mm allowance, model uses Being numerical control moulding process, surplus reduces to 2mm, it is achieved that reduces strand processing weight and reaches about 50%.
5) due to vacuum pressing and casting use dry sand casting, moisture-free in sand, can greatly reduce because of The quality problems such as the sand holes that cause for steam, bubble.
6) vacuum pressing and casting need not use the chemicals such as substantial amounts of paint, and resin glue, decreases a large amount of Gaseous contamination.
7) utilize vacuum pressing and casting to produce product, during cast, pernicious gas is all extracted into blast pipe In road, substantially improve the working environment in workshop, reduce and pollute.
Detailed description of the invention
For the technological means making the present invention realize, creation characteristic, reach purpose and effect and be readily apparent from Solve, below in conjunction with specific embodiment, the present invention is expanded on 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 machined surface biasing to be thickeied according to inner bag foundry goods X-Y scheme, fast automatic interpolation casting The allowance of part and other necessary sized, then utilize polyurethane foamed material to process design recessed Mould and punch model.
The most first die model is fixed on positioning mould board, puts suitable dimension in the profile of model the most again Chill, leave certain gap between chill, the negative pressure ventilation when of conveniently vacuumizing, while put chill While add sand, convenient fixing chill position.
3. because the model of punch is complex, directly processing spill cannot moulding, and numerical control is molded nothing Method processes the concave shape of complexity, so for complicated box casting, the method using secondary moulding, Directly process the punch shape of needs, then utilize this punch vacuum moulding to go out a die, then exist Being well placed the running gate system of design on die, running gate system plastic sheeting to be wrapped up, simultaneously in die On wall, while put chill limit to add sand, negative-pressure pipeline is put in matrix, in order to increase moulding intensity simultaneously, After adding sand, it is put into plain bumper jolt ramming, then extrusion forming.
4. the model of upper nowel is sprayed, dry, then carry out mould assembling cast.Note: cast Time should intensified negative pressure degree, in order to avoid the type that collapses.When pouring into a mould, aluminium alloy solution temperature controls at 700 DEG C Left and right, completes cast at the appointed time.
5. using the method to produce household electrical appliances die for inner strand, technique is advanced, and casting yield is high, foundry goods Surface quality has reached unprecedented height.
The general principle of the present invention and principal character and advantages of the present invention have more than been shown and described.One's own profession Skilled person will appreciate that of industry, the present invention is not restricted to the described embodiments, above-described embodiment and explanation The principle that the present invention is simply described described in book, 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 both fall within claimed invention model In enclosing.Claimed scope is defined by appending claims and equivalent thereof.

Claims (1)

1. a metal mold technique based on V method casting inner container of icebox mould strand, it is characterised in that bag Include following processing step:
A) complete the threedimensional model design of inner bag product based on computer aided design software, cast according to inner bag Inner bag product threedimensional model is pre-processed by part X-Y scheme;
B) inside and outside concave-convex mold parting based on computer aided design software and the design of other running gate system, Specifically include: sprue, cross gate, ingate, Riser Dimensions size and location, steam vent and pre- Bury the design of water pipe tube seat, model is carried out PROCESS FOR TREATMENT simultaneously;
C) model mould assembling and putting, according to sandbox size, selects appropriate punch model, model Selection shape to be followed is similar, the principle that draw ratio is close, it is impossible to height is differed the biggest model and is placed on Together, punch location is put to same template;
D) disposable die is made: cover sandbox with the punch being well placed, make disposable die, then By die body take out, the most again will after the loose piece breakage of model take out, it is impossible to destroy sand mold shape and Film;
E) design of frozen iron blocks and putting, the heat storage coefficient of cast iron chill is relatively big, can absorb more heat Amount, has stronger Quench ability;Frozen iron blocks is while carrying out limit rounding, and fillet size is carried out as required Processing and fabricating;
Inwall conformal at die puts frozen iron blocks structure casting mold punch profile, and frozen iron blocks is close to the most recessed Mould Internal periphery, it is ensured that casting dimension accuracy, fills up with dry sand at the gap between frozen iron blocks, the completeest Fill out tight frozen iron blocks with sand after becoming the structure of a local, and consolidation sand mold prevents frozen iron blocks from shifting, at chill The back side is welded with T-shaped hook, strengthens the bonding strength of frozen iron blocks and sand mold, and whole chill metal mold cavity will not Dislocation comes off;
After the internal good chill of cloth of punch and dry sand, whole sandbox puts plain bumper jolt ramming, is then taken out very by top box Sky, and the form film of disposable die is pasted on top box, nowel cancels negative pressure of vacuum, then under Box disintegration, now obtains the punch with chill;
F) making of die: first corresponding model is placed on template according to symmetrical structure, location Wanting accurately, then model to be carried out overlay film and vacuumize, overlay film is the same with punch after completing, and selects suitably Chill is close to around model, then back-up sand consolidation, vacuumizes, and takes out model;
G) melting of aluminium alloy, reasonably to control temperature of aluminum liquid well during aluminium alloy smelting, temperature of aluminum liquid reaches Removing the gred during to 690 DEG C, the temperature of Metamorphism treatment is at 700-750 DEG C, and the temperature of blowing refining exists 700-750 DEG C, the aluminium liquid after refining is skimmed after standing a period of time, and last aluminium liquid pouring temperature controls 700-750℃;
H) unpack after foundry goods cools down naturally and take out foundry goods.
CN201410778854.2A 2014-12-15 2014-12-15 Metal mold technique based on V method casting inner container of icebox mould strand Active CN104525855B (en)

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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
CN105312496B (en) * 2015-12-07 2017-03-29 河北安迪模具有限公司 V method moulding teeming lines
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
CN106180568B (en) * 2016-09-07 2018-12-14 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 mold slab
CN107052262B (en) * 2016-12-29 2019-08-09 滁州鑫诺实业有限公司 A kind of V method model casting technique casting electronic appliance mold complex class pedestal
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

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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
CN102773409B (en) * 2012-07-24 2014-01-01 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
CN103658526B (en) * 2013-11-26 2016-03-02 滁州金诺实业有限公司 Be beneficial to the vacuum sealed molding inner container of icebox template class aluminium alloy castings technique of cooling
CN103658525B (en) * 2013-11-26 2016-01-13 滁州金诺实业有限公司 A kind of V method mould casting electronic appliance mold strand

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