CN105665650A - Precoated sand mold for casting stainless steel thin-walled workpiece - Google Patents
Precoated sand mold for casting stainless steel thin-walled workpiece Download PDFInfo
- Publication number
- CN105665650A CN105665650A CN201610263115.9A CN201610263115A CN105665650A CN 105665650 A CN105665650 A CN 105665650A CN 201610263115 A CN201610263115 A CN 201610263115A CN 105665650 A CN105665650 A CN 105665650A
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- Prior art keywords
- cross gate
- mould
- stainless steel
- precoated sand
- casting
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/082—Sprues, pouring cups
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses a precoated sand mold for casting a stainless steel thin-walled workpiece. The precoated sand mold comprises a cover mold, at least one intermediate mold and a bottom mold, which are arranged in order from top to bottom, wherein casting cavities are formed between the adjacent molds; a communicated vertical runner is formed in the cover mold, the intermediate mold and the lower mold; one end of the vertical runner is arranged on a pouring gate on the cover mold, and the other end blocks the bottom mold; the vertical runner is communicated with a transverse runner; the transverse runner is communicated with the casting cavities through auxiliary runners; the casting runners are communicated with exhaust vents. With adoption of the precoated sand mold disclosed by the invention, the stainless steel casting with the thickness of 2-3 mm can be casted; the casting is not liable to crack; the finished product yield is high.
Description
Technical field
The present invention relates to precoated sand mould, particularly relate to the precoated sand mould of cast stainless steel 2-3mm thin-wall part.
Background technology
Current thin-section casting many employings model casting. Metal die is first manufactured in model casting, penetrating, wax machine suppresses wax-pattern with metal die, single wax-pattern is combined on casting system and forms many wax trees, wax tree applies multiple layer refractory, form shell after dry hardening, then the wax in shell is melted so as to flow out, then by Baking so as to firm, finally being molded in shell by the liquid metal of fusing again, namely liquid metal becomes required foundry goods in shell after cooled and solidified.
Model casting advantage: model casting adopts the casting of hot shell, thin-section casting can be produced, the minimum wall thickness (MINI W.) of foundry goods can accomplish 2 millimeters, foundry goods has the high dimensional accuracy of comparison and surface smoothness, so machining operations can be reduced, simply requiring that on part a little allowance is stayed at higher position, even some foundry goods only stays polishing, polishing surplus machining can use.
Model casting shortcoming: the many production procedures of the operation of model casting are complicated, it is necessary to consuming more auxiliary material, Ministry Of Fuel And Power power, production cost is higher. The shell drying time long production cycle processed of model casting is also long.
The easy produced problem of thin-wall stainless steel foundry goods: thin-wall stainless steel; Steel-casting easily occurs crackle in process of production; Cold shut shrinkage cavity; Elephant skin; Misrun and sand gas hole defect.
Usual solution: investment cast
1, casting Technology Design must assure that quick casting, it is to avoid during casting, filling velocity is excessively slow.
2, Baking out before casting mold casting, improves mold temperature.
3, cast temperature is properly increased
4, adopting the measure discharging low temperature molten steel, early stage enters the molten steel of casting mold and discharges casting mold by drainage channel.
Summary of the invention
For solving above-mentioned technical problem, the present invention provides the precoated sand mould of a kind of cast stainless steel thin-wall part, it is possible to the stainless cast steel part that casting 2-3mm is thick, fluid origin foundry goods not easily crackle, yield rate is high.
For realizing above-mentioned technical purpose, the precoated sand mould of the technical scheme is that cast stainless steel thin-wall part, it is made up of the cover mold set gradually from top to bottom, at least one intermediate die and bed die, casting mold cavity is offered between adjacent mould and mould, the sprue being connected it is provided with in cover mold, intermediate die and bed die, one end of sprue is located at casting gate on cover mold, its other end blocks on bed die, sprue is communicated with cross gate, cross gate is connected with casting mold cavity by secondary running channel, is communicated with steam vent on casting mold cavity.
Cross gate of the present invention is opened between cover mold and intermediate die, between intermediate die and intermediate die or between intermediate die and bed die.
Cross gate of the present invention is opened on adjacent mould, and the bottom surface of mould above offers cross gate, and the end face being positioned below mould offers lower cross gate, and upper cross gate and lower cross gate match.
The longitudinal section height of upper cross gate of the present invention is more than the longitudinal section height of lower cross gate, and the ratio of the longitudinal section height of upper cross gate and the longitudinal section height of lower cross gate is more than 2.
The end face of the closure end of sprue of the present invention is lower than the bottom surface of bottom cross gate.
Secondary running channel of the present invention is provided with a plurality of, and a plurality of secondary running channel is symmetrically arranged at the both sides of cross gate.
The longitudinal section of secondary running channel of the present invention is rectangle or trapezoidal.
Secondary running channel of the present invention is opened on the bottom surface of top mould of adjacent mould.
Secondary running channel of the present invention and the size of the communications ports of the cross gate size more than secondary running channel with the communications ports of casting mold cavity.
The longitudinal section height of secondary running channel of the present invention paints depth of section ratio more than 2 with cross gate.
Steam vent of the present invention is Z-shaped hole.
The invention has the beneficial effects as follows:
1, adopting the casting of precoated sand shell core mould, this sand kind has high temperature collapsibility better due to it, and it is a lot of that deformability is better than resin sand, and surface quality of continuous castings is good, easy shaping etc. advantage, is suitable for producing in enormous quantities. But this sand kind gas forming amount is bigger, raising rate than common sand fast a lot, the easy moisture absorption of process operation, whole manufacturing process wants the good technique of strict implement, multilamellar intermediate die can be added as required, utilize the casting cycle of sprue-cross gate-pair running channel, only for molten steel, it is achieved the casting of stainless steel thin-walled member.
2, cross gate structural manufacturing process: cross gate typing is arranged; Upper cross gate is positioned at mould, and lower cross gate is positioned at counterdie, and secondary running channel opening communicates with workpiece cavity on upper cross gate again. This kind of structure is conducive to improving Molten Steel Cleanliness, and does not affect being cast into of molten steel; Molten steel gravity is conducive to slag pore to float, and sand grains sinks down on lower cross gate, makes pure molten steel be cast into casting mold cavity, thus improving workpiece quality.
3, sprue locations of structures: follow principle and be of moderate size, it is to avoid straight-through, just right with workpiece cast gate, is unfavorable for purification of molten steel, and the molten steel flowed down, lower than the bottom surface of bottom cross gate, can be carried out sediment, purify molten steel by the closure end of sprue.
4, the structure of secondary running channel: secondary running channel is uniformly arranged on the both sides of cross gate, realize both sides uniformly to cast, simultaneously, secondary running channel is set to secondary running channel and the size of the communications ports of the cross gate size more than secondary running channel with the communications ports of casting mold cavity, accelerate to be cast into the flowing of molten steel, it is prevented that molten steel misrun and deformation occurs slowly because being cast into.
5, the aspect ratio of cross gate and secondary running channel: the longitudinal section height of secondary running channel paints depth of section ratio more than 2 with cross gate, change the size being cast into mouth, secondary running channel is rising head with cross gate connected entrance, Riser Dimensions design is wanted rationally, general satisfaction casting modulus, rising head is excessive, and its process of setting is relatively slow, making the solidification shrinkage tension suffered by rising head enclosure region relatively big, easily there is fire check in foundry goods; Feeder Design position is generally all distributed in casting section thickness opposite piece should cut relative thinnest part, the existing flow direction flows to thin place for thick place, molten steel of the present invention is conducive to Workpiece shaping from the thin thickness place that flows to, avoid liquid steel temperature to reduce misrun and cold shut shrinkage cavity elephant skin etc. occur, solidification relative equilibrium, reaches to improve finished workpart rate.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention;
Fig. 2 is the structural representation of the cover mold of the present invention;
Fig. 3 is the structural representation of the intermediate die of the present invention;
Fig. 4 is the structural representation of the bed die of the present invention;
Fig. 5 be the cover mold of the present invention look up perspective view;
Fig. 6 is the perspective view of the intermediate die of the present invention;
Fig. 7 is the perspective view of the bed die of the present invention;
Fig. 8 is the perspective view of the running channel of the present invention;
Fig. 9 is the structural representation of the secondary running channel of the present invention;
In figure: 1, cover mold, 2, intermediate die, 3, bed die, 4, casting mold cavity, 5, sprue, 501, closure end, 6, cross gate, 601, upper cross gate, 602, lower cross gate, 7, secondary running channel, 701, rising head, 8, steam vent, 9, cup, 10, screw rod.
Detailed description of the invention
As it can be seen, according to foundry goods drawing making resin-coated sand shell mould model, point bed die; Intermediate die; Cover mold. Cover mold, intermediate die and bed die set gradually from top to bottom, be provided with and extend vertically through resin-coated sand shell mould sprue in the middle part of cover mold, intermediate die, bed die shell mould; This sprue is cylindrical, connects three moulds, and the sprue in cover mold is connected with the cup at cover mold top, the sprue tail end closure in bed die. Foundry goods die cavity is distributed in cross gate both sides, symmetrical, and respectively open a part of die cavity at two adjacent up and down moulds, form complete foundry goods die cavity, foundry goods die cavity is that 4,8,12,16 distributed rectangular are in vertical running channel both sides, sprue avoid with foundry goods die cavity pair running channel lead directly to, bed die, intermediate die, cover mold surrounding be connected to negative and positive rim of the mouth seal be connected; Middle formwork can fold multilamellar. Each stacking adds uses screw-pressing formwork after sealing completes. Cup is connected to cover mold sprue place, and rim of the mouth connects, and namely the liquid stainless steel material of casting high temperature obtains foundry goods.
Sprue is vertically set on each mold layer center, in column type, cross gate is horizontally disposed with and vertical with sprue, the connectivity part of sprue and cross gate is for seamlessly transitting, cross gate is arranged between each mold layer, cross gate is communicated with secondary running channel, secondary running channel connects with casting mold cavity again, the communications ports of secondary running channel and casting mold cavity is positioned at casting mold cavity top, adopts the casting of precoated sand shell core mould, and to have high temperature collapsibility better due to it for this sand kind, it is a lot of that deformability is better than resin sand, surface quality of continuous castings is good, easy shaping etc. advantage, is suitable for producing in enormous quantities. But this sand kind gas forming amount is relatively big, raising rate than common sand fast a lot, the easy moisture absorption of process operation, by this kind of mode of communicating, Impurities of Molten Steel is purified.
The optimal setting form of secondary running channel is be symmetricly set on the both sides of cross gate with the form of 4,8 12,16, namely, namely the secondary running channel of guarantee sprue both sides is even number, ensure that secondary running channel adds up to even number again, it is prevented that asymmetric, go wrong when casting.
Cross gate can be opened between cover mold and intermediate die, between intermediate die and intermediate die or between intermediate die and bed die. Can individually be opened in cover mold bottom surface, intermediate die end face, intermediate die bottom surface or on bed die end face.
Cross gate another kind offers form, it is opened on adjacent mould, the bottom surface of mould above offers cross gate, the end face being positioned below mould offers lower cross gate, upper cross gate and lower cross gate match, and upper cross gate is stitched together with lower cross gate, forms trapezoidal tract and is cross gate, trapezoidal tract is up-narrow and down-wide, and circular arc chamfering is opened in cross gate corner.The longitudinal section height of upper cross gate is more than the longitudinal section height of lower cross gate, and the ratio of the longitudinal section height of upper cross gate and the longitudinal section height of lower cross gate is more than 2. Both longitudinal section aspect ratios are preferably 3,3.5,4,4.5,5. This kind of structure is conducive to improving Molten Steel Cleanliness; Molten steel gravity is conducive to slag pore to float, and sand grains sinks thus improving workpiece quality.
Secondary running channel is opened on the bottom surface of top mould of adjacent mould, for cover mold and intermediate die, cover mold bottom surface is offered cross gate, and intermediate die end face offers lower cross gate, offers a plurality of secondary running channel on upper cross gate, and secondary running channel is rising head with casting mold cavity communications ports. The longitudinal section height of secondary running channel paints depth of section ratio more than 2 with cross gate, and both longitudinal section aspect ratios are preferably 3,3.5,4,4.5,5.
Secondary running channel selects structure to be cuboid or wedge, the communications ports of secondary running channel and cross gate mouth is rectangle, secondary running channel and the size of the communications ports of the cross gate size more than secondary running channel with the communications ports of casting mold cavity, communications ports size change into a progressive formation, belong to smooth change, circular arc chamfering is offered on four limits of secondary running channel, the injection making molten steel is more smooth, optimal setting form is, the link of secondary running channel and cross gate is overbank, and the one end connected with beveled end is cuboid.
Its process of setting of thin-wall part is complicated, and casting process influence factor is a lot, and quality control difficulty is big, crackle, deformation, misrun and sand pore problem often easily occurs. Therefore, the process design method of Thin-Section Steel Castings and thinking are had from the design of general foundry goods bigger different. Its technological design is more focused on requiring reasonably to offer dead head.
Rising head position selection principle: Riser Dimensions design is wanted rationally, general satisfaction casting modulus, and rising head is excessive, its process of setting is relatively slow, makes the solidification shrinkage tension suffered by rising head enclosure region relatively big, and fire check easily occurs in foundry goods; Feeder Design position is generally all distributed in casting section thickness opposite piece should cut relative thinnest part (maximum difference). Molten steel is conducive to Workpiece shaping from the thin thickness place that flows to, it is to avoid liquid steel temperature reduces misrun and cold shut shrinkage cavity elephant skin etc. occurs, solidifies relative equilibrium, reaches to improve finished workpart rate.
The casting method of cast stainless steel thin-wall part:
Step one, according to foundry goods drawing making resin-coated sand shell mould model, make bed die, intermediate die and cover mold, by bed die, intermediate die, cover mold in the way of from bottom to up, stack compresses successively.
Step 2, being injected by the sprue on cover mold molten steel that cast temperature is 1650-1700 DEG C, molten steel passes sequentially through sprue, cross gate, secondary running channel inject casting mold cavity, has cast in 1-3 minute.
Step 3, naturally cool to room temperature, complete casting.
Stack is cast: stack casting improves the better molding of molten steel casting gravitation energy. Produce in enormous quantities and reduce cost raising efficiency.
It is suitable for various thin-wall part yield rate by putting into practice new technology structure in a large number; It is low that high molten steel Utilization rate is greatly improved steady quality cost; Mold-filling capacity is strong; Thin-section casting and trickle character pattern such as trade mark, specifications and models etc. can be produced, the minimum wall thickness (MINI W.) of foundry goods can accomplish 2.5--3 millimeter, new technology adopts precoated sand to reach dimensional accuracy and the surface smoothness that fusible pattern feature has comparison high equally, so machining operations can be reduced, simply on part, require that a little allowance is stayed at higher position, even some foundry goods only stays polishing, polishing surplus machining can use, and substantially can substitute for model casting precision part.
Steam vent connects with casting mold cavity, it is arranged between mould and mould contact surface, steam vent is offered into Z-shaped hole, unnecessary in mould can be died with rage discharge when casting by the steam vent of this kind of structure, until having cast, meanwhile, this structure is possible to prevent the molten steel in casting mold cavity to outpour, because precoated sand self has certain degassing function, it is only necessary to this kind of osculum formula steam vent can complete exhaust work.
Casting process adopts natural cooling, precoated sand is by heat absorption after molten steel heating, insulation effect is played in natural cooling, by being incubated the cooling realized, making rustless steel shaped inner crystallization finer and smoother, internal stress is little, be unlikely to deform, crackle, finished workpart rate is high, realizes without other heat insulation work, and structure is simpler.
For the space in a more step Appropriate application precoated sand, in secondary running channel Shang Kai branch, casting mold cavity can be opened in secondary running channel surrounding, it is achieved pour into a mould simultaneously, difform casting mold cavity can be offered, be suitable for the casting of small articles.
Claims (10)
1. the precoated sand mould of cast stainless steel thin-wall part, it is characterized in that: by the cover mold (1) set gradually from top to bottom, at least one intermediate die (2) and bed die (3) composition, casting mold cavity (4) is offered between adjacent mould and mould, in cover mold (1), intermediate die (2) be provided with the sprue (5) being connected in bed die (3), one end of sprue (5) is opening at cover mold (1), its other end blocks on bed die (3), sprue (5) is communicated with cross gate (6), cross gate (6) is connected with casting mold cavity (4) by secondary running channel (7), casting mold cavity (4) is communicated with steam vent (8).
2. the precoated sand mould of cast stainless steel thin-wall part as claimed in claim 1, it is characterised in that: described cross gate (6) is opened between cover mold (1) and intermediate die (2), between intermediate die (2) and intermediate die (2) or between intermediate die (2) and bed die (3).
3. the precoated sand mould of cast stainless steel thin-wall part as claimed in claim 1, it is characterized in that: described cross gate (6) is opened on adjacent mould, the bottom surface of mould above offers cross gate (601), the end face being positioned below mould offers lower cross gate (602), and upper cross gate (601) and lower cross gate (602) match.
4. the precoated sand mould of cast stainless steel thin-wall part as claimed in claim 3, it is characterized in that: the longitudinal section height of described upper cross gate (601) is more than the longitudinal section height of lower cross gate (602), and the ratio of the longitudinal section height of upper cross gate (601) and the longitudinal section height of lower cross gate (602) is more than 2.
5. the precoated sand mould of cast stainless steel thin-wall part as claimed in claim 1, it is characterised in that: the end face of the closure end (501) of described sprue (5) is lower than the bottom surface of bottom cross gate (6).
6. the precoated sand mould of cast stainless steel thin-wall part as claimed in claim 1, it is characterised in that: described secondary running channel (7) is provided with a plurality of, and a plurality of secondary running channel (7) is symmetrically arranged at the both sides of cross gate (6).
7. the precoated sand mould of cast stainless steel thin-wall part as claimed in claim 1, it is characterised in that: the longitudinal section of described secondary running channel (7) is rectangle or trapezoidal.
8. the precoated sand mould of cast stainless steel thin-wall part as claimed in claim 1, it is characterised in that: described secondary running channel (7) is opened on the bottom surface of top mould of adjacent mould.
9. the precoated sand mould of cast stainless steel thin-wall part as claimed in claim 1, it is characterised in that: described secondary running channel (7) and the size of the communications ports of cross gate (6) size more than secondary running channel (7) with the communications ports of casting mold cavity (4).
10. the precoated sand mould of cast stainless steel thin-wall part as claimed in claim 1, it is characterised in that: the longitudinal section height of described secondary running channel (7) paints depth of section ratio more than 2 with cross gate (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610263115.9A CN105665650A (en) | 2016-04-26 | 2016-04-26 | Precoated sand mold for casting stainless steel thin-walled workpiece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610263115.9A CN105665650A (en) | 2016-04-26 | 2016-04-26 | Precoated sand mold for casting stainless steel thin-walled workpiece |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105665650A true CN105665650A (en) | 2016-06-15 |
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ID=56215721
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610263115.9A Pending CN105665650A (en) | 2016-04-26 | 2016-04-26 | Precoated sand mold for casting stainless steel thin-walled workpiece |
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| CN (1) | CN105665650A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107737879A (en) * | 2017-11-30 | 2018-02-27 | 中国科学院金属研究所 | A kind of running gate system cast suitable for big module and preparation method thereof |
| CN108971435A (en) * | 2018-10-08 | 2018-12-11 | 西安合力汽车配件有限公司 | A kind of casting device and technique for precoated sand bulk article |
| CN112247079A (en) * | 2020-09-28 | 2021-01-22 | 安徽长青建筑制品有限公司 | Stamping die is used in processing of scaffold frame fastener |
| CN113042690A (en) * | 2021-03-12 | 2021-06-29 | 贵州航天风华精密设备有限公司 | Parallel runner for improving production efficiency of castings and construction method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107737879A (en) * | 2017-11-30 | 2018-02-27 | 中国科学院金属研究所 | A kind of running gate system cast suitable for big module and preparation method thereof |
| CN107737879B (en) * | 2017-11-30 | 2023-09-05 | 中国科学院金属研究所 | Pouring system suitable for large-module casting and preparation method thereof |
| CN108971435A (en) * | 2018-10-08 | 2018-12-11 | 西安合力汽车配件有限公司 | A kind of casting device and technique for precoated sand bulk article |
| CN112247079A (en) * | 2020-09-28 | 2021-01-22 | 安徽长青建筑制品有限公司 | Stamping die is used in processing of scaffold frame fastener |
| CN113042690A (en) * | 2021-03-12 | 2021-06-29 | 贵州航天风华精密设备有限公司 | Parallel runner for improving production efficiency of castings and construction method thereof |
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