CN103639367B - There is case V method core manufacturing craft - Google Patents
There is case V method core manufacturing craft Download PDFInfo
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- CN103639367B CN103639367B CN201310270744.0A CN201310270744A CN103639367B CN 103639367 B CN103639367 B CN 103639367B CN 201310270744 A CN201310270744 A CN 201310270744A CN 103639367 B CN103639367 B CN 103639367B
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Abstract
The invention discloses one and have case V method core manufacturing craft, be specially: the core print part of core is extended to certain length, extension is placed in sandbox.Manufacturing with the moulding of V method of core, step is: core box apperance vacuumizes, overlay film; Spray paint, oven dry; Put into " core sand case "; Add sand, jolt ramming; Strike off sandbox upper surface sand, epiphragma; " core sand case " vacuumizes, core box apperance goes vacuum; Molding.For complex structure, an inconvenient core of direction depanning, core box adopts and is divided into two pieces or polylith diaphragm capsule block, the molding from different directions of each module.For the core of two or more core print, as long as a core print is with " sandbox core print ", all the other core prints are by normal core print design.Scheme makes the overlay film of V legal system core process, and the operations such as epiphragma become simple possible, and conveniently, processing ease, applicability is wide, is convenient to implement for the handling of core, lower core.Be not only applicable to the core manufacturing foundry goods surrounding side, be more suitable for sand cores of castings such as manufacturing casing, pipe fitting, pump case.
Description
Technical field
The present invention relates to casting field, being specifically related to one has case V method core manufacturing craft, is adapted to the core that medium-and-large-sized foundry goods is produced in the moulding of V method.Be not only applicable to the core making foundry goods surrounding side, be more suitable for making casing, pipe fitting (as straight-through, threeway, elbow), pump case, the core of the foundry goods such as valve body.
Background technology
The moulding of V method as third generation formative method, does not use binding agent when moulding at casting industry, thus casting falling sand, scale removal process is simple, and foundry goods low cost of manufacture, equipment investment is few.And casting dimension accuracy is high, surface smoothness is high.Sharpest edges are that production environment cleans, and have no irritating odor, old sand is fully recovering almost, and the discarded object of castings production process is few, is called Green foundry, is used widely in recent years.
Although V method is cast with lot of advantages, being greatly limited property of V method casting application.Because V method core-making technique is not resolved, it is simple that the casting of V method is only applicable to part-structure, the foundry goods of centreless or few core.Now, the core used in the casting of V method, generally manufactures by methods such as resin sand, water-glass sand, precoated sands, and this adds equipment investment on the one hand, adds manufacturing cost, brings certain difficulty also to the sand process in later stage.When particularly resin sand core is larger, more, because gas forming amount is large, causes casting defect, time serious, cause casting wasted product.Therefore, V method core-making technique is the yoke of V method cast growth all the time.
Summary of the invention
In order to overcome the V legal system core problem in existing V method foundry engieering, V method is cast and is more widely used, the invention provides one has case V method core manufacturing craft.
One has case V method core manufacturing craft, is specially: casting Technology Design extends to certain length the locating core head part of core, and extension is placed in sandbox.This sandbox is called " core sand case ", and the core print in sandbox and sandbox is called " sandbox core print ", and it forms a part for whole fuse.The cavity shape of core box apperance is formed by the core shape of actual foundry goods and locating core head part, and not containing " sandbox core print " part, the location of core completes by location core print, and core box apperance is be with the mold-like structure of vacuum tank.Manufacturing with the moulding of V method of core, processing step is: core box apperance vacuumizes, overlay film; Spray paint, dries; Put into " core sand case " at core box upper surface; Add sand, jolt ramming; Strike off sandbox upper surface sand, epiphragma; " core sand case " vacuumizes, and core box goes vacuum; Molding, namely coremaking complete.
Further, described in have case V legal system core technique with sandbox, be called " core sand case ", tank wall is double layer hollow hermetically-sealed construction, material is iron and steel or other metals, and inwall has aspirating hole and screen pack, and top box mouth contacts with plastic sheeting with nowel mouth, require impulse-free robustness, smooth, smooth.Outer wall is provided with case axle, suspension ring, vacuum tube joint.
The location of core completes by location core print, and " sandbox core print " does not play the role of positioning, and will reserve the space that " sandbox core print " takies when technological design in sand mold.And around " sandbox core print ", reserve enough gaps (20-40 millimeter).
For larger core, if length is more than one meter.Arrange arbor vacuum tube in " core sand case ", play arbor effect on the one hand, on the other hand, make vacuum in core even, sand core strength is consistent.Vacuum tube tube wall has breeder tube, has stainless steel filter screen outside wall.Fig. 7 is shown in by this kind of sandbox, Fig. 8.
Further, described core box is the mold-like structure of band vacuum tank, and vacuum tank outer wall is provided with vacuum tube joint, is connected with vacuum line.The cavity shape of core box apperance is formed, not containing " sandbox core print " part by the core shape of actual foundry goods and locating core head part.The upper surface of core box is location core print and the interfacial epitaxial planar of sandbox core print, and this plane is equivalent to the template face of common V method moulding apperance, contacts during this face coremaking with " core sand case ", and overlay film, need flat smooth.
External boundary size is slightly larger than the outer wall dimension of " core sand case ".As Fig. 1, Fig. 2, Fig. 3.
Further, more complicated for structure, an inconvenient core of direction depanning, core box adopts and is divided into two or more diaphragm capsule block, each module has independently vacuum tank, and each core box intermodule has alignment pin to locate, and core box upper surface has pattern draft (0 °-3 °) along parting direction.
Further, after matched moulds, because core inner chamber lateral dimension is greater than core print size, make core box interior space than greatly suitable for reading, core box is deeply recessed, be difficult to the core of overlay film, at the independent overlay film in surface of the corresponding core of each core box module, during overlay film, 50-80 millimeter surplus film is reserved outside overlay film surface, be beneficial to face seal, each core box overlay film surface spraying material, dry.Carry out matched moulds, clamping afterwards.Undertaken by above-mentioned processing step again.After final molding, the unnecessary film of each core box module seam crossing is removed, then paste along seam with adhesive tape, avoid gas leakage.
Further, after lower core, with " core print sandbox " in loose sand filling mo(u)ld bottom half gap around.Prick a few place of plastic sheeting between loose sand and mo(u)ld bottom half with crooked chisel afterwards, make it to communicate.Then, then with plastic sheeting loose sand surface is sealed with the die joint overlay film of mo(u)ld bottom half.Such filled out loose sand just becomes one overall with mo(u)ld bottom half by vacuumizing, and possesses some strength, to ensure after mould assembly the stable of core in casting process.
Further, for the core of two or more core print, as long as a core print is with " sandbox core print ", all the other core prints are by normal self-hardening sand technique core print design.
" sandbox core print " can be placed in type, according to casting structure, also " sandbox core print " can be placed on outside type.See Figure 11, Figure 13, Figure 14.
Further, this has case V method core manufacturing craft, and make the overlay film of V legal system core process, the operations such as epiphragma become simple possible.Can solve in the major part of V method casting, the making of large-scale core.Further, the handling of core, lower core are all more convenient.Be not only applicable to the core of foundry goods surrounding side, be more suitable for and manufacture casing, pipe fitting (as straight-through, threeway, elbow), pump case, the core of valve body class foundry goods.In being applicable to, the making of heavy castings core.Having given full play to the advantage of V method casting, is the pioneering development of V method casting.
Accompanying drawing explanation
Fig. 1, Fig. 2, Fig. 3 are " core sand case ", core box structure and coremaking schematic diagram
In figure, 1-core sand case 2-case axle 3-suspension ring 4 sandbox vacuum tube joint 5-locates core print 6-core 7-core box upper surface 8-" sandbox core print " 9-core box inwall, outer wall 10-core box apperance 11-core box vacuum tube joint
Fig. 4, Fig. 5, Fig. 6 are the mould assembly schematic diagrames of core and upper and lower type
In figure, 201-mo(u)ld top half 202-mo(u)ld bottom half 203-core 204-cope vacuum tube joint breach 205-core sand case vacuum tube joint Fig. 2-2 is the top views removing mo(u)ld top half, and Fig. 2-3 is P direction view after mould assembling (band top boxs)
The core box that Fig. 9 is made up of two points, left and right diaphragm capsule and coremaking schematic diagram.Wherein " core sand case " is with arbor vacuum tube.Fig. 7, Fig. 8 are " core sand case " sketches, eliminate the aspirating hole of vacuum tube, screen pack etc. in figure.In figure, 301-parts core box 302-on the left side and parts core box 303-core 304-core sand case 305 arbor vacuum tube on the right side
Figure 10, Figure 11 are pipe fitting, the core box of threeway class core, coremaking and lower core schematic diagram,
Figure 10 is the sandbox of later half core box and band arbor vacuum tube, coremaking schematic diagram.11 is lower core schematic diagrames, and " core sand case " is in the outside of sand mold.401-core sand case 402-later half core box 403-core box upper surface 404-core 405-core box alignment pin or hole 406-mo(u)ld bottom half 407-foundry goods die cavity in figure
Figure 12, Figure 13, Figure 14 are the core box of pipe joint core, coremaking and lower core schematic diagram,
Figure 12 is sandbox, the coremaking schematic diagram of later half core box and band arbor vacuum tube.Figure 13, Figure 14 are lower core schematic diagrames, and " core sand case " is in the outside of sand mold.501-core sand case 502-arbor vacuum tube 503-later half core box 504 core box upper surface 505 alignment pin or hole 506-core 507-mo(u)ld bottom half 508-foundry goods die cavity in figure
Detailed description of the invention
Core print designs: in casting technique, general core has core print, and the effect of core print is located and fixes core in sand mold.The present invention extends core print length, and extension is placed in sandbox, and this sandbox is called " core sand case ", and the core print in sandbox and sandbox is called " sandbox core print ", and it forms a part for whole fuse.
The length of " sandbox core print " is mainly considered in lower core process, and the suspension ring of hanging " core sand case " can make core keep balance in the horizontal direction substantially, are convenient to lower core.
For longer core, hanging core body part can be considered, but must hang by soft ribbons, in order to avoid damage core.
The location of core completes by core print.The technological parameter (core print size, clearance etc.) of core print design is identical with common self-hardening sand.Difference is core that this V method is manufactured many " sandbox core print ", and it is a part for core print, the location of core completes by location core print, and " sandbox core print " does not play the role of positioning.The space that " sandbox core print " takies will be reserved in sand mold when technological design.And enough gaps are reserved around " sandbox core print ".Play in core process like this, " core sand case " does not contact with sand mold, is convenient to lower core, does not also affect core location.
In sand mold, reserve the vacuum tube joint of " core case " outer wall and suspension ring, space that case axle takies, and retain certain interval, vacuum tube joint stretched out outside sandbox.
According to casting structure, to some casing, pump case, tubing foundry goods, " sandbox core print " can be placed on outside sand mold.Make sand mold shape simpler.As shown in Figure 11, Figure 13.
" core sand case " designs: " core sand case " structure is similar to common V method sandbox, and be tank wall double layer hollow hermetically-sealed construction, material is iron and steel or other metals, and inwall has aspirating hole and screen pack, and sandbox outer wall is provided with vacuum tube joint, suspension ring, case axle.As shown in Figure 1, Figure 2, Figure 3 shows.
The size of sandbox is according to the design of core print size, and inner wall of sand box size fundamental sum location core print outer profile size is identical.See Fig. 1, Fig. 3.
If core size comparatively large (if length is more than 1 meter), arbor vacuum tube can be set up in sandbox inside, the length of vacuum tube and lateral dimension relevant to core size and shape, length extended sandbox lower surface extension is to sand core internal, make sand core internal vacuum even, increase the intensity of core.Vacuum tube also plays arbor effect, further increases the intensity of core.Vacuum tube tube wall has breeder tube.Stainless steel filter screen is had outside wall.See Figure 12, Figure 13.
The length of " core sand case " is exactly " sandbox core print ", length, both unified (not containing built-in arbor vacuum tube).See Fig. 1 and Fig. 4, Fig. 5.
The design of core box: core box mold-like structure is similar to V method moulding apperance, be made up of the apperance of band vacuum tank, vacuum tank is connected with vacuum line.The cavity shape of core box apperance is formed, not containing " sandbox core print " part by the core shape of actual foundry goods and locating core head part.The upper surface of core box outwards extends along the interface of locating core print and sandbox core print, and form a plane, this plane is equivalent to the template face of common V method mould.This plane wants flat smooth, and boundary dimensions is slightly larger than the outer wall dimension of " core sand case ".As Fig. 1, Fig. 2
The making of core: first, vacuumizes core box, then the EVA film of heating is overlayed on core box inner chamber and core box upper surface, and EVA film will reserve 50-80 millimeter surplus in sandbox surrounding, so that seal with sandbox outer wall.At film surface spray paint after overlay film finishing, dry.
Then, put " core sand case " at core box upper surface; Add sand, jolt ramming; Struck off by sandbox upper surface sand, cover common plastic film, sandbox surrounding reserves 50-80 millimeter surplus.Note the suspension ring of sandbox, case axle and vacuum tube joint position when putting sandbox, the handling of core, lower core and mould assembly be convenient to.Vacuumize then to " core sand case ", reserved film is affixed to sandbox wall surface, sealing.
Be remove core box vacuum again, the case axle of hanging " core sand case " carries out molding, and core is separated with core box, takes out core.
Finally core is placed on above cushion or loose sand, the hanging position of conversion core, is changed into the suspension ring of hanging sandbox by the case axle of hanging sandbox, be beneficial to core horizontal positioned, prepare lower core.
After core molding and in handling, lower core, mould assembly and casting process, core keeps vacuum always, removes after a while after pouring.
Fig. 1 is " core sand case ", core box structure and coremaking schematic diagram;
Fig. 4, Fig. 5, Fig. 6 are the mould assembly schematic diagrames of core and mo(u)ld top half, mo(u)ld bottom half
Further, for comparatively complex structure, an inconvenient core of direction depanning, core box adopts and is divided into two pieces or polylith core box module, and each module has independently vacuum tank, and each core box intermodule has alignment pin to locate.Conveniently divide diaphragm capsule, above core box, have certain pattern draft in parting direction.General 0 °-3 °.
The processing step of at this moment coremaking is: matched moulds clamping → each module vacuumizes → overlay film, spray paint, oven dry → put into sandbox → back-up sand jolt ramming → sandbox epiphragma → sandbox suitable for reading to vacuumize → each diaphragm capsule block go vacuum → molding (parting).
Further, after matched moulds, because core inner chamber lateral dimension is greater than core print size, make core box interior space than greatly suitable for reading, core box is deeply recessed, be difficult to the core of overlay film, will the independent overlay film in surface of the corresponding core of each core box module (during overlay film, reserve 50-80 millimeter surplus film outside overlay film surface, be beneficial to face seal), each core box overlay film surface spraying material, carries out matched moulds, clamping afterwards.Down carry out by above-mentioned processing step again.After final molding, the unnecessary film of each core box module seam crossing is removed.Paste along seam with adhesive tape again, avoid gas leakage.See Fig. 7, Figure 10, Figure 12
After lower core, with " sandbox core print " gap around of loose sand filling mo(u)ld bottom half.Prick a few place of plastic sheeting between loose sand and mo(u)ld bottom half with crooked chisel afterwards, make it to communicate.Then, then with plastic sheeting loose sand surface is sealed with the die joint overlay film of mo(u)ld bottom half.Such filled out loose sand just becomes one overall with mo(u)ld bottom half by vacuumizing, and possesses some strength, to ensure after mould assembly the stable of core in casting process.
According to casting structure, some casing, tubing foundry goods, can be placed on " sandbox core print " outside sand mold.Make sand mold shape simpler, volume reduces.See Figure 10, Figure 11 and Figure 12, Figure 13
The enforcement of this programme is to professional and technical personnel's easy understand.The above case, signal do not limit the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. one kind has case V method core manufacturing craft, be specially: during casting Technology Design, the core print part of core is extended to certain length, extension is placed in sandbox, form " sandbox core print ", it forms a part for whole core, this sandbox is called " core sand case ", core box apperance band vacuum tank, and vacuum tank is connected with vacuum line, manufacturing with the moulding of V method of core, processing step is: core box apperance vacuumizes, overlay film; Spray paint, oven dry; Put into " core sand case " at core box upper surface; Add sand, jolt ramming; Strike off sandbox upper surface sand, epiphragma; " core sand case " vacuumizes, core box goes vacuum; Molding, namely coremaking complete.
2. there is case V method core manufacturing craft according to claim 1, it is characterized in that: made core is with sandbox, and the tank wall of " core sand case " is double layer hollow hermetically-sealed construction, and inwall has aspirating hole and screen pack, material is iron and steel or other metals, top box mouth contacts with plastic sheeting with nowel mouth, requires impulse-free robustness, smooth, smooth, outer wall is provided with case axle, suspension ring, vacuum tube joint.
3. there is case V method core manufacturing craft according to claim 1, it is characterized in that: core location completes by location core print, and " sandbox core print " does not play the role of positioning, and reserves enough gaps in sand mold around " sandbox core print ".
4. have case V method core manufacturing craft according to claim 1, it is characterized in that: for larger sandbox, in sandbox, vacuum tube is set, vacuum tube length and radial dimension relevant to core size and shape, on the one hand play arbor effect; On the other hand, make vacuum in core even, sand core strength is consistent, and add the intensity of core, vacuum tube tube wall has breeder tube, has stainless steel filter screen outside wall.
5. there is case V method core manufacturing craft according to claim 1, it is characterized in that: described core box is the mold-like structure of band vacuum tank, vacuum tank outer wall is equipped with vacuum tube joint, the upper surface of core box is location core print and the interfacial epitaxial planar of sandbox core print, this plane is equivalent to the template face of common V method moulding apperance, contact with " core sand case " during this face coremaking and overlay film, flat smooth.
6. there is case V method core manufacturing craft according to claim 1, it is characterized in that: more complicated for structure, an inconvenient core of direction depanning, core box adopts and is divided into two pieces or polylith diaphragm capsule block, the molding from different directions of each module, each module has independently vacuum tank, and each core box intermodule has alignment pin to locate, and core box upper surface has pattern draft along parting direction.
7. there is case V method core manufacturing craft according to claim 1, it is characterized in that: after core box matched moulds, because core lateral dimension is greater than core print size, make core box interior space than greatly suitable for reading, or core box is darker, be difficult to the core of overlay film, at the independent overlay film in surface of the corresponding core of each core box module, during overlay film, 50-80 millimeter surplus eva film can be reserved outside overlay film surface, each core box overlay film surface spraying material, dries; Carry out matched moulds, clamping afterwards; Down carry out by above-mentioned processing step again, after final molding, the unnecessary film of each core box module seam crossing is removed, then paste by the seam of adhesive tape along core box module, avoid gas leakage, the method is highly suitable for making casing, pipe fitting, as straight-through, threeway, elbow, pump case, the core of valve body class foundry goods.
8. have case V method core manufacturing craft according to claim 1, it is characterized in that: for the core of two or more core print, as long as one of them core print is with " sandbox core print ", all the other core prints are by normal core print design.
9. there is case V method core manufacturing craft according to claim 1, it is characterized in that: " sandbox core print " leaves gap around and between sand mold, after lower core, fill up the gap of mo(u)ld bottom half with loose sand and overlay film sealing makes loose sand and mo(u)ld bottom half together vacuumize, became one, increase core stability.
10. there is case V method core manufacturing craft according to claim 1, it is characterized in that: " sandbox core print " can be placed in type, according to casting structure, also " sandbox core print " can be placed on outside type.
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| CN104801671A (en) * | 2015-04-30 | 2015-07-29 | 柳州科尔特锻造机械有限公司 | V-method casting process |
| CN105108067B (en) * | 2015-08-31 | 2017-08-25 | 宁夏共享模具有限公司 | It is a kind of to lift the method that explosion core mould fills sand shaping |
| CN117862427B (en) * | 2024-03-12 | 2024-05-17 | 华翔(翼城)工业装备有限公司 | Production line for V-method casting |
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| US3964534A (en) * | 1974-03-04 | 1976-06-22 | Ford Motor Company | Casting method with a vacuum bonded dry sand core |
| SU1311840A1 (en) * | 1985-03-07 | 1987-05-23 | Предприятие П/Я Г-4874 | Casting tool for making,,particularly,,large-size cores by vacuum-film moulding |
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