CN103639362B - A kind of non air exit hole resin sand full mold casting method - Google Patents
A kind of non air exit hole resin sand full mold casting method Download PDFInfo
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- CN103639362B CN103639362B CN201310699954.1A CN201310699954A CN103639362B CN 103639362 B CN103639362 B CN 103639362B CN 201310699954 A CN201310699954 A CN 201310699954A CN 103639362 B CN103639362 B CN 103639362B
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Abstract
The invention discloses a kind of non air exit hole resin sand full mold casting method, comprise and make apperance and running gate system, moulding, smelting and pouring and shaping sand removal step, in described making apperance and running gate system step, the upper surface of apperance pre-sets allowance, described step of overall modelling does not roll steam vent, described running gate system comprises the sprue that some vertically arranged tops are provided with cup, and the volume of cup is greater than the volume of sprue; The bottom of sprue is communicated with the cross gate be arranged in parallel with apperance length direction, the lower surface of cross gate and the bottom surface of apperance flush with or slightly higher than the bottom surface of apperance, the length of cross gate is 60% of apperance length, on cross gate, interval arranges some ingates be communicated with apperance, in described cast step, by some cups casting of molten metal simultaneously.Do not prick during moulding of the present invention and establish steam vent, during cast, apperance is not burnt, and does not produce pernicious gas, is conducive to the protection of environment.
Description
Technical field
The present invention relates to a kind of casting technique, specifically a kind of cavityless casting method.
Background technology
Cavityless casting adopts styrofoam apperance to replace common apperance, application furan resin self curing sand carries out moulding, the direct casting of molten metal of apperance is not taken out after having made type, under the effect of molten metal, apperance burning, gasification and disappear, molten metal replaces the locus occupied by original apperance, obtains the casting method of the foundry goods identical with apperance shape after cooled and solidified.
The production process of cavityless casting is generally: 1) make apperance and running gate system: adopt styrofoam to make apperance and running gate system, and apperance is the same with foundry goods entity and have certain allowance, and running gate system designs according to apperance; 2) moulding: apperance is mated with prefabricated running gate system and combines, and in apperance the some rising head models of fixed placement, apperance, running gate system and rising head model surface coating coating; Stably be placed in sandbox or melt pit by complete for the assembly of apperance, running gate system and rising head model after coating dries, in sandbox or melt pit, fill the also real resin sand of Chong make casting mold, above the top, apperance of casting mold, roll some steam vents be in communication with the outside; 3) smelting and pouring: adopt smelting equipment refining molten metal, after resin sand sclerosis, molten metal is injected casting mold by sprue, and molten metal enters the apperance in sandbox or melt pit along running gate system, completes the burning of apperance, gasification, disappearance process; 4) shaping sand removal: treat the complete coagulation forming of the molten metal of apperance and pouring and riser systems, mould casting is taken out by resin sand, cleans out.
Running gate system is molten metal is introduced the passage that apperance offers when being cast, mainly comprise sprue, cross gate and ingate, sprue top is in communication with the outside, bottom vertical connection cross gate, cross gate is arranged near apperance, and cross gate is communicated with by ingate with apperance.The casting dimension accuracy that cavityless casting is produced is high, and surface roughness is good.And without the need to molding in production process, simplify castings production operation, therefore cavityless casting production method obtains and promotes rapidly.But because cavityless casting is when pouring into a mould, the gas that apperance gasification produces can cause more serious environmental pollution.Along with improving constantly of environmental requirement, need to invest considerable capital to guarantee to produce meet the requirement of environmental protection, this adds increased production cost, limit further developing of enterprise.
Summary of the invention
The technical issues that need to address of the present invention are to provide a kind of environmental protection, free of contamination non air exit hole resin sand full mold casting method.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is:
A kind of non air exit hole resin sand full mold casting method, comprises and makes apperance and running gate system, moulding, smelting and pouring and shaping sand removal step, and in described making apperance and running gate system step, the upper surface of apperance pre-sets the allowance for collecting residue,
Do not roll steam vent in described step of overall modelling, described running gate system comprises the sprue that some vertically arranged tops are provided with funnel shaped cup, and the volume of described cup is greater than the volume of sprue; The bottom of sprue is communicated with the cross gate be arranged in parallel with apperance length direction, the lower surface of cross gate and the bottom surface of apperance flush with or slightly higher than the bottom surface of apperance, the length of described cross gate is 60% of apperance length, and on cross gate, interval arranges some ingates parallel to each other be communicated with apperance
In described cast step, by some cups casting of molten metal simultaneously, the speed that described molten metal injects each cup must ensure that sprue is closed by the molten metal in cup.
Further improvement of the present invention is: top is provided with the both sides that the sprue of cup, cross gate and ingate are symmetricly set on apperance length direction.
Further improvement of the present invention is: the exit cross-section of described ingate is for oval, and the major axis of described ellipse is 40 ~ 50mm, and oval minor axis is 30 ~ 40mm, the circle of the cross section of described sprue to be diameter be 110 ~ 120mm.
Further improvement of the present invention is: the distance between two adjacent ingates of homonymy is 400 ~ 500mm.
Further improvement of the present invention is: the speed that described molten metal injects each cup is 220 ~ 300kg/s.
Further improvement of the present invention is: in described casting process, and arrange pressure case iron at casting mold end face, the weight of described pressure case iron is 3 ~ 5 times of casting weight.
Owing to have employed technique scheme, the technological progress that the present invention obtains is:
The present invention does not prick when moulding and establishes steam vent, and the whole die cavity of casting mold is entity, and do not have oxygen in casting mold die cavity during cast, apperance is not burnt, and does not produce pernicious gas, is conducive to the protection of environment.Cross gate length is 60% of apperance length, and cross gate is arranged on the bottom of apperance, is convenient to the impurity of casting mold die cavity floating to upper surface, prevents from occurring dreg defect at cast-internal in the process injecting molten metal, improves the quality of foundry goods.Running gate system arranges multiple tracks sprue and ingate, be conducive to molten metal and be full of casting mold die cavity fast, to the endothermic reaction in the resistance of molten metal and gasification when alleviating apperance gasification, improve the mobility of molten metal, being convenient to simultaneously filling casting mold stably when pouring into a mould.The cross section of ingate is set to ellipse, improves pushing off the slag effect, and in scale removal process, cutting polishing is convenient, is conducive to foundry goods attractive in appearance.
Poring rate is 220 ~ 300kg/s, ensures that the duration of pouring is short, prevents oxygen from entering casting mold, avoid apperance to burn.
Pressure case iron is set at casting mold end face, prevents the molten metal entering casting mold die cavity when pouring into a mould from damaging casting mold, ensure that in casting process, casting mold is intact.The weight of pressure case iron is 3 ~ 5 times of casting weight, avoids causing security incident, ensures safety in production.
Accompanying drawing explanation
Fig. 1 is the structural representation of running gate system of the present invention.
Wherein, 1, apperance, 2, sprue, 3, cross gate, 4, ingate, 5, cup.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further details:
A kind of non air exit hole resin sand full mold casting method, comprises and makes the step such as apperance and running gate system, moulding, smelting and pouring and shaping sand removal.For the cavityless casting method of lathe casting in the present embodiment, described lathe casting finished product profile is a cuboid framework, and long is 15m, wide 3.2m, and high 2.1m, casting weight is 83t.
Make apperance according to casting finished products, described apperance is identical with casting finished products profile, and the allowance that the machined surface of casting finished products is arranged is 20mm.For ensureing casting product quality, when making apperance, the upper surface of apperance pre-sets has the certain thickness allowance for collecting residue.In the present embodiment, the allowance of the upper surface of apperance increases 2 ~ 3mm than the allowance of other machined surface, makes the slag inclusion, impurity etc. that float up to foundry goods upper surface can remove clean by carrying out machining to upper surface, ensures the quality of foundry goods.
In described step of overall modelling, running gate system and apperance combine, and structure as shown in Figure 1, does not roll steam vent in step of overall modelling.Described running gate system comprises sprue 2, cross gate 3 and ingate 4.The circle of the cross section of described sprue to be diameter be 110 ~ 120mm, sprue vertical level is arranged, and sprue top arranges cup 5, and the end face of cup is higher than apperance upper surface 400 ~ 600mm.Described cross gate 3 vertical connection is in sprue 2 bottom, the setting of cross gate 3 is parallel with apperance length direction, be positioned at the bottom of apperance both sides, the lower surface of cross gate and the bottom surface of apperance flush with or slightly higher than the bottom surface of apperance, the length of cross gate is 60% of apperance length, the cross section of cross gate is inverted isosceles trapezoid, and the upper base length of described isosceles trapezoid is 120 ~ 140mm, and length of going to the bottom is 100 ~ 120mm.Described ingate 4 is arranged between cross gate and apperance, and the shape of cross section of ingate is oval.Ingate and cross gate vertical connection are arranged, and the major axis of ingate port of export cross section ellipse is 40 ~ 50mm; Oval minor axis is 30 ~ 40mm.For making molten metal uniform pack casting mold die cavity, top is provided with the sprue 2 of cup 5, cross gate 3 and ingate 4 and arranges in the bilateral symmetry of the length direction of apperance.For ensureing molten metal Fast Filling casting mold die cavity, cross gate arranges the cup of some roads sprue and correspondence, cross gate vertically arranges an ingate at interval of 400 ~ 500mm, inject molten metal by the cup of several sprues during cast simultaneously, molten metal enters die cavity by the ingate port of export, the casting mold of filling simultaneously.
In the present embodiment, in the step of overall modelling of lathe casting, the circle of the cross section of described sprue to be diameter be 120mm, on every bar cross gate, vertical connection is provided with three road sprues.The upper base of described cross gate isosceles trapezoid is long is 140mm, and going to the bottom long is 120mm.The major axis of the port of export ellipse of described ingate is 50mm, and minor axis is 40mm.
Complete in moulding, when pouring into a mould, for preventing the too large damage casting mold of the buoyancy of the molten metal entering casting mold die cavity, arrange pressure case iron at casting mold end face, the weight of described pressure case iron is 3 ~ 5 times of casting weight.Described cast step, when the wall thickness of apperance is greater than 40mm, pouring temperature is 1280 ~ 1320 DEG C; When the wall thickness of foundry goods is less than or equal to 40mm, pouring temperature is 1330 ~ 1350 DEG C.By some cups casting of molten metal simultaneously when pouring into a mould, the speed that described molten metal injects each cup must ensure that sprue is closed by the molten metal in cup, and the speed that molten metal injects each cup is 220 ~ 300kg/s.Inject molten metal in six cups corresponding on the present embodiment Zhong You six road sprue, the injection rate of molten metal is 280kg/s simultaneously.
Claims (6)
1. a non air exit hole resin sand full mold casting method, comprise and make apperance and running gate system, moulding, smelting and pouring and shaping sand removal step, it is characterized in that: in described making apperance and running gate system step, the upper surface of apperance pre-sets the allowance for collecting residue
Do not roll steam vent in described step of overall modelling, described running gate system comprises the sprue (2) that some tops perpendicular to horizontal plane layout are provided with funnel shaped cup (5), and the volume of described cup (5) is greater than the volume of sprue (2); The bottom of sprue (2) is communicated with the cross gate (3) be arranged in parallel with apperance length direction, the lower surface of cross gate and the bottom surface of apperance flush with or slightly higher than the bottom surface of apperance, the length of described cross gate is 60% of apperance length, on cross gate, interval arranges some ingates (4) parallel to each other be communicated with apperance
In described cast step, by some cups casting of molten metal simultaneously, the speed that described molten metal injects each cup must ensure that sprue is closed by the molten metal in cup.
2. a kind of non air exit hole resin sand full mold casting method according to claim 1, is characterized in that: top is provided with the both sides that the sprue (2) of cup (5), cross gate (3) and ingate (4) are symmetricly set on apperance length direction.
3. a kind of non air exit hole resin sand full mold casting method according to claim 2, it is characterized in that: the exit cross-section of described ingate is for oval, the major axis of described ellipse is 40 ~ 50mm, oval minor axis is 30 ~ 40mm, the circle of the cross section of described sprue to be diameter be 110 ~ 120mm.
4. a kind of non air exit hole resin sand full mold casting method according to claim 2, is characterized in that: the distance between two adjacent ingates of homonymy is 400 ~ 500mm.
5. a kind of non air exit hole resin sand full mold casting method according to claim 1, is characterized in that: the speed that described molten metal injects each cup is 220 ~ 300kg/s.
6. a kind of non air exit hole resin sand full mold casting method according to claim 1, is characterized in that: in described casting process, and arrange pressure case iron at casting mold end face, the weight of described pressure case iron is 3 ~ 5 times of casting weight.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310699954.1A CN103639362B (en) | 2013-12-19 | 2013-12-19 | A kind of non air exit hole resin sand full mold casting method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310699954.1A CN103639362B (en) | 2013-12-19 | 2013-12-19 | A kind of non air exit hole resin sand full mold casting method |
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| CN103639362A CN103639362A (en) | 2014-03-19 |
| CN103639362B true CN103639362B (en) | 2015-12-02 |
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| CN104399881B (en) * | 2014-11-21 | 2017-03-29 | 宜昌船舶柴油机有限公司 | The casting method of low-speed diesel for large-bore vessel bearing block steel-casting |
| CN108311646A (en) * | 2018-04-13 | 2018-07-24 | 芜湖久弘重工股份有限公司 | A kind of large-sized numerical control grinder bed disappearance proplasm preparation method |
Citations (2)
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| CN200995262Y (en) * | 2007-02-01 | 2007-12-26 | 广西玉柴机器股份有限公司 | Pouring caster of cylinder end |
| CN202555765U (en) * | 2012-04-18 | 2012-11-28 | 六安市发达铸造有限公司 | Pouring mold for bases of lathe beds |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0655242A (en) * | 1992-08-07 | 1994-03-01 | Tokyo Tekko Co Ltd | Lost foam pattern casting method and casting device |
| JPH10235451A (en) * | 1997-02-26 | 1998-09-08 | Iwasaki:Kk | Mold for partial precision casting, and casting method |
| JPH1190583A (en) * | 1997-09-12 | 1999-04-06 | Mitsubishi Kagaku Basf Kk | Full-mold casting method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200995262Y (en) * | 2007-02-01 | 2007-12-26 | 广西玉柴机器股份有限公司 | Pouring caster of cylinder end |
| CN202555765U (en) * | 2012-04-18 | 2012-11-28 | 六安市发达铸造有限公司 | Pouring mold for bases of lathe beds |
Non-Patent Citations (2)
| Title |
|---|
| 大平板类铸件实型铸造工艺的实践;孙长富，等;《铸造技术》;20090715(第7期);第103-109页 * |
| 实型铸造生产42吨磨床床身工艺技术总结;韩永生，等;《中国第二届消失模铸造技术国际会议暨第九届实型(消失模)铸造学术年会》;20061015;第303-310页 * |
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