CN104525858B - Vacuum pressing and casting electronic appliance mold aluminium alloy castings built-in pipe technique - Google Patents

Vacuum pressing and casting electronic appliance mold aluminium alloy castings built-in pipe technique Download PDF

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Publication number
CN104525858B
CN104525858B CN201410779323.5A CN201410779323A CN104525858B CN 104525858 B CN104525858 B CN 104525858B CN 201410779323 A CN201410779323 A CN 201410779323A CN 104525858 B CN104525858 B CN 104525858B
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China
Prior art keywords
casting
die
pipe
sand
water pipe
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CN201410779323.5A
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CN104525858A (en
Inventor
李健
徐乔
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CHUZHOU XINNUO 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00Casting in, on, or around objects which form part of the product
    • B22D19/16Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills

Abstract

The invention discloses a kind of vacuum pressing and casting electronic appliance mold aluminium alloy castings built-in pipe technique, on the basis of secondary formative technology, combine the new technology of our company's products characteristics, its purpose is to solve to use sand casting die for inner yield rate low, Mechanical processing of casting surplus is big, die surface easily produces pin hole, the various casting flaw such as shrinkage porosite, in order to solve the problems referred to above, so the technique that have employed vacuum pressing and casting, on the basis of vacuum casting process, achieve the research of technique of pre-buried water pipe, this technique is remained while improving casting quality, achieve energy-conservation purpose.Thing followed problem is that traditional built-in pipe technique then cannot be useful on vacuum casting process.

Description

Vacuum pressing and casting electronic appliance mold aluminium alloy castings built-in pipe technique
Technical field
The present invention relates to casting technology field, be specifically related to a kind of vacuum pressing and casting electronic appliance mold aluminium alloy castings Built-in pipe technique.
Background technology
Household electrical appliances die for inner is the one of vacuum plastics sucking moulding, refrigerator producer by mould is heated, Then ABS plastic is softened plastics sucking moulding.The heating of mould is by being embedded in the water inside aluminium alloy castings Pipe realizes, and circulate in water pipe hot water, realizes the temperature to unitary mould by controlling discharge and temperature Degree controls.
At present, general employing Sand Moulding Process casting household electrical appliances die for inner, the pre-buried of water pipe then passes through at sand Making tube seat in type in advance, then the shape of tube seat is worked it out by moulding, will be curved according to tube seat size in advance Copper pipe or the stainless steel tube of system are placed in tube seat, by using the iron wire pipe clamp of U-shaped, are fixed by pipeline, Then with damp sand, the two ends of pipeline are blocked, reserve interface position, pre-buried copper pipe or stainless steel tube Scribble one layer of graphite, play the heat insulation effect preventing and softening and prevent aluminum liquid circulation copper pipe from entering pipeline.
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 vacuum pressing and casting electronic appliance mold aluminium alloy castings built-in pipe technique of product quality.
The technical problem to be solved realizes by the following technical solutions:
A kind of vacuum pressing and casting electronic appliance mold aluminium alloy castings built-in pipe technique, comprises the technical steps that:
A) based on digital control processing polyurethane foam model, this model is to add technique ginseng according to three-dimensional modeling Number Design and Machining out, such as: add allowance, drafting angle, water pipe tube seat, and water Injection system etc.;
B) first bend water pipe, according to the pipeline on polyurethane foam model, manually bend out all sizes Water pipe, the material of water pipe uses copper pipe or stainless steel tube, the bending radius of a diameter of 12mm or 14mm Cannot be less than 40 millimeters, bending sections is long-pending cannot be less than full-sized 70%, and spare interface length cannot be less than 80 millimeters;
C) polyurethane foam model mould assembling and putting, according to punch moulded dimension size, selects suitable sand Case, then overlay film, model evacuation, then add sand, jolt ramming, overlay film, sandbox evacuation, take out model, Obtain a die model, select suitable chill to be close to around die model, then back-up sand consolidation, Evacuation, takes out die model;
D) die model is processing when, is reserved with the position of tube seat, so this die model inwall stays There is the shape for lugs of tube seat, now, tube seat fixing tool is fixed on tube seat high spot;This tube seat frock Being made up of two parts, one is the iron wire of fixing water pipe, in the position of tube seat through thin film, is responsible for being wrapped in On water pipe, two is positioner, is one block of square iron with hook, serves fixing iron wire position, prevents Stop bit moves and the effect of chill, and according to 100~150 millimeters of each distances, this frock is booked whole pipe Road, inserts iron wire in sand mold;
E), after the internal good chill of cloth of punch model and dry sand, whole sandbox puts plain bumper jolt ramming, then by upper Case evacuation, and the form film of disposable die model is pasted on top box, nowel is cancelled vacuum and is born Pressure, then descends box disintegration, now obtains the die model with positioning tool;
F) installation of pipeline, to be coated with one layer of fire clay before installing water pipe, baking is dried the most in an oven, At least temperature more than 300 degree is toasted 15 minutes, cools down after taking-up, because the thin film that negative pressure casting uses High temperature cannot be born, it is stuck on pipeline according to corresponding shape after cooling, then by stretching before Iron wire is fastened water pipe, and water pipe termination resin sand model is blocked, spare interface position, solid with adhesive tape Determine resin sand;
G) melting of aluminium alloy, reasonably to control temperature of aluminum liquid well during aluminium alloy smelting, general aluminum liquid temperature Degree reaches to remove the gred when 690 DEG C, and the temperature of Metamorphism treatment is at about 710 DEG C, and the temperature of blowing refining exists 730℃.Aluminum liquid after refine is skimmed after standing a period of time, because containing pipeline, temperature of aluminum liquid needs slightly Low, the cast last aluminum liquid pouring temperature containing pipe foundry goods controls at about 700 DEG C;
H) unpacking taking-up foundry goods after foundry goods natural cooling, notes, because frock has iron wire to be connected with foundry goods, noting Taking-up frock recycles.
The invention has the beneficial effects as follows:
1) have employed the mode of vacuum pressing and casting, mechanization degree is higher, reduces labor intensity.Tradition founding Casting uses manual work, and this invention is set up on the basis of mechanization vacuum pressing and casting, and labor 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) on the basis of vacuum casting process, it is achieved that the research of technique of pre-buried water pipe, foundry goods is being improved This technique is remained, it is achieved that energy-conservation purpose while quality.
Accompanying drawing explanation
Fig. 1 is mould assembling schematic diagram of the present invention;
Fig. 2 is nowel moulding schematic diagram of the present invention;
Fig. 3 is top box moulding schematic diagram of the present invention;
Fig. 4 is water pipe positioning tool structure chart of the present invention.
1, positioning tool, 2, vacuum sand box;3, chill;4, running gate system model;5, dry sand;6、 Die model;7, punch model;8, negative-pressure pipeline;9, water pipe.
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 being specifically illustrating, the present invention is expanded on further.
See Fig. 1-4: a kind of vacuum pressing and casting electronic appliance mold aluminium alloy castings built-in pipe technique, including following work Skill step:
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 model 6 and punch model 7, wherein leave tube seat position on die model 6 in advance.
2. Fig. 4 is that I takes charge of the water pipe positioning tool 1 of design, this frock according to tube seat size and depth design, Frock includes the iron wire part 101 of fixing water pipe, convenient through thin film, and the locating piece of settling position 102, prevent frock to be subjected to displacement, in order to adapt to the technique of vacuum pressing and casting, have employed and be embedded in die model On 6, water pipe location and the effect of chill are simultaneously worked as.
3. Fig. 2 is display nowel moulding schematic diagram.First punch model 7 is fixed on positioning mould board, then Put the chill 3 of suitable dimension again in the profile of punch model 7, between chill 3, leave certain gap, set Upper vacuum sand box 2, while put chill 3 limit to add dry sand 5, convenient fixing chill 3 position, adds after sand completes and shakes Real sandbox, then evacuation.
4. Fig. 3 is top box moulding schematic diagram, is also the feature place of the present invention, because the mould of punch model 7 Type is complex, directly processing spill cannot moulding, and numerical control molding cannot process complexity spill Shape, so for complicated box casting, the method using secondary moulding, directly processing needs Punch shape, then utilizes this punch vacuum moulding to go out a die model 6, then on die model 6 It is well placed the running gate system 4 of design, and positioning tool 1 is fixed on corresponding pipeline, every 100~150mm mono-, tool for placing working tools limit, limit adds sand, puts in matrix by negative-pressure pipeline 8 simultaneously, in order to increase Add moulding intensity, after adding sand, be put into plain bumper jolt ramming, then extrusion forming.
5. after punch moulding completes, by the water pipe 9 that bent according to pipeline, it is embedded in groove, then profit Water pipe 9 is fixed on pipeline by the iron wire part 101 stretched by frock.
6. 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.
The ultimate 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 (2)

1. a vacuum pressing and casting electronic appliance mold aluminium alloy castings built-in pipe technique, it is characterised in that include as Lower processing step:
A) based on digital control processing polyurethane foam model;
B) first bend water pipe, according to the pipeline on polyurethane foam model, manually bend out required size Water pipe;
C) polyurethane foam model mould assembling and putting, according to punch moulded dimension size, selects suitable sand Case, then overlay film, model evacuation, then add sand, jolt ramming, overlay film, sandbox evacuation, take out model, Obtain a die model, select suitable chill to be close to around die model, then back-up sand consolidation, Evacuation, takes out die model;
D) die model is processing when, is reserved with the position of tube seat, tube seat fixing tool is fixed on Tube seat high spot;This frock is booked whole pipeline according to 100~150 millimeters of each distances, iron wire is inserted Enter in sand mold;
E), after the internal good chill of cloth of punch model and dry sand, whole sandbox puts plain bumper jolt ramming, then by upper Case evacuation, and the form film of disposable die model is pasted on top box, nowel is cancelled vacuum and is born Pressure, then descends box disintegration, now obtains the die model with positioning tool;
F) installation of pipeline, to be coated with one layer of fire clay before installing water pipe, baking is dried the most in an oven, Temperature more than 300 DEG C is toasted 15 minutes, cools down, be stuck in pipe according to corresponding shape after cooling after taking-up Lu Shang, is then fastened water pipe by the iron wire stretched before, and water pipe termination resin sand model blocks up Living, spare interface position, with adhesive tape fixing resin sand;
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 710 DEG C, and the temperature of blowing refining is at 730 DEG C, smart Aluminum liquid after refining is skimmed after standing a period of time, and the cast last aluminum liquid pouring temperature containing pipe foundry goods controls 700℃;
H) unpacking taking-up foundry goods after foundry goods natural cooling.
Vacuum pressing and casting electronic appliance mold aluminium alloy castings built-in pipe technique the most according to claim 1, its It is characterised by: the material of described water pipe uses copper pipe or the stainless steel tube of a diameter of 12mm or 14mm, curved Bilge radius cannot be less than 40 millimeters, and bending sections is long-pending cannot be less than full-sized 70%, and spare interface length is not Must be less than 80 millimeters.
CN201410779323.5A 2014-12-15 2014-12-15 Vacuum pressing and casting electronic appliance mold aluminium alloy castings built-in pipe technique Active CN104525858B (en)

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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
CN106890974A (en) * 2017-03-21 2017-06-27 珠海市润星泰电器有限公司 A kind of semisolid pressure casting mould
CN109648063B (en) * 2017-10-12 2021-04-06 烟台吉森新材料科技有限公司 Fixing structure and method for water cooling pipe in buried pipe casting
CN108858912A (en) * 2018-06-06 2018-11-23 江苏瀚皋机械有限公司 A kind of vacuum forming mold suction hole manufacture craft
CN109986057B (en) * 2019-04-23 2021-05-28 临沂大学 Aluminum alloy made household air conditioner stop valve and manufacturing method thereof
CN110860656A (en) * 2019-11-05 2020-03-06 北京遥感设备研究所 Precise forming method for complex inner runner structure
CN111940677A (en) * 2020-07-23 2020-11-17 中国第一汽车股份有限公司 Casting method of pre-embedded die of stainless steel water-cooling pipe

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DE10014591C1 (en) * 2000-03-27 2001-08-02 Actech Gmbh Adv Casting Tech Process for increasing pouring in sand molds with directional solidification of castings
JP5124163B2 (en) * 2007-04-19 2013-01-23 独立行政法人国立高等専門学校機構 Casting equipment
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
CN102806311B (en) * 2012-08-30 2014-05-14 贵州安吉航空精密铸造有限责任公司 Forming process of complicated titanium alloy investment casting pipeline

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Effective date of registration: 20210301

Address after: 239000, No. 401, East Xin'anjiang Road, Chuzhou City, Anhui Province

Patentee after: CHUZHOU XINNUO INDUSTRIAL Co.,Ltd.

Address before: No. 999, Huadong Road, Chuzhou Development Zone, Anhui Province 239000

Patentee before: CHUZHOU JINNUO INDUSTRIAL Co.,Ltd.