CN103639367A

CN103639367A - Core production technology through V method with box

Info

Publication number: CN103639367A
Application number: CN201310270744.0A
Authority: CN
Inventors: 张志国
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-06-22
Filing date: 2013-06-22
Publication date: 2014-03-19
Anticipated expiration: 2033-06-22
Also published as: CN103639367B

Abstract

The invention discloses a core production technology through a V method with a box. The technology concretely comprises: a core head part of a sand core is extended to certain length, and the extended part is placed in a sand box; the sand core is produced through V method molding. The steps are as follows: a core box pattern is subjected to vacuum pumping, film overlaying, paint spraying and drying and then placed into a "core sand box"; sand is added and jolt ramming is carried out; the sand on the upper surface of the sand box is smoothed and a film is covered; the "core sand box" is subjected to vacuum pumping and the core box pattern is subjected to vacuum removal; pattern drawing is carried out. To a sand core with a complex structure and which has difficulty in mold stripping in the same direction, the core box is divided into two blocks or a plurality of pattern box blocks, and each pattern block is subjected to pattern drawing from different directions. To a sand core with above two core heads, as long as one core head is equipped with "a sand box core head", other core heads are designed according to normal core heads. The procedures of film overlaying, film covering and the like are simple and practicable during the core production process through a V method. The lifting of a sand core and core setting are convenient. The technology has easy operation, wide applicability and is convenient for implementation. The technology is suitable for producing sand cores at side surfaces of a casting and is further suitable for producing casting sand cores of box bodies, pipe fittings, pump shells and the like.

Description

There is case V method core manufacturing craft

Technical field

The present invention relates to casting field, be specifically related to a kind of case V method core manufacturing craft that has, be adapted to the core that medium-and-large-sized foundry goods is produced in the moulding of V method.Be not only applicable to manufacture 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 the foundry goods such as valve body.

Background technology

The moulding of V method as third generation formative method, is not used binding agent at casting industry when moulding, thus casting falling sand, scale removal process is simple, foundry goods low cost of manufacture, and equipment investment is few.And casting dimension accuracy is high, surface smoothness is high.Sharpest edges are that production environment is clean, have no irritating odor, and old sand is fully recovering almost, and the discarded object of castings production process is few, are called green casting.Be 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 using in the casting of V method, generally manufactures by methods such as resin sand, water-glass sand, precoated sands, and this has increased equipment investment on the one hand, has increased manufacturing cost, brings certain difficulty also to the sand processing in later stage.When particularly resin sand core is larger, more, because gas forming amount is large, cause casting defect, when 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, the casting of V method is more widely used, the invention provides a kind of case V method core manufacturing craft that has.

There is a case V method core manufacturing craft, be 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 core shape and the locating core head part of actual foundry goods, not containing " sandbox core print " part.The location of core completes by location core print.Core box apperance is the apperance structure with vacuum tank.

Manufacturing with the moulding of V method of core, processing step is: core box apperance vacuumizes, overlay film; Spray paint, dries; At core box upper surface, put into by " core sand case "; Add sand, ram-jolt; Strike off sandbox upper surface sand, epiphragma; " core sand case " vacuumizes, and core box goes vacuum; Molding, coremaking complete.

Further, described in have case V method core manufacturing craft 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, requirement is without burr, 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 " do not play the role of positioning, and will in sand mold, reserve the space that " sandbox core print " takies when technological design.And reserve enough gaps (20-40 millimeter) around at " sandbox core print ".

For larger core, if length is more than one meter.In " core sand case ", arbor vacuum tube is set, plays arbor effect on the one hand, on the other hand, make the interior vacuum of core even, sand core strength is consistent.Vacuum tube tube wall has breeder tube, and wall has stainless steel screen pack outward.Fig. 3-1 is shown in by this kind of sandbox, Fig. 3-2.

Further, described core box is the apperance structure with 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 by core shape and the locating core head part of actual foundry goods, not containing " sandbox core print " part.The upper surface of core box is the interfacial epitaxial planar of location core print and sandbox mind.This plane is equivalent to the template face of common V method moulding apperance.During this face coremaking, contact with " core sand case ", and overlay film, need smooth smooth.

External boundary size is slightly larger than the outer wall dimension of " core sand case ".As Fig. 1-1, Fig. 1-2, Fig. 1-3.

Further, for compared with complex structure, an inconvenient core of direction depanning, core box adopts and is divided into two or more diaphragm capsule pieces, each module has independently vacuum tank, and each core box intermodule has alignment pin location, 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 internal space ratio suitable for reading large, core box is recessed dark, the core that is difficult to overlay film, the independent overlay film in surface (during overlay film, reserve minimum 50-80 millimeter surplus film outside overlay film surface, be beneficial to face seal) at the corresponding core of each core box module, each core box overlay film surface spraying material, dries.Carry out afterwards matched moulds, clamping.By above-mentioned processing step, undertaken again.After final molding, the unnecessary film of each core box module seam crossing is removed.With adhesive tape, along seam, paste again, avoid gas leakage.

Further, after lower core, with " core print sandbox " gap around in loose sand filling mo(u)ld bottom half.With crooked chisel, prick several places of plastic sheeting between loose sand and mo(u)ld bottom half afterwards, make it to communicate.Then, then with plastic sheeting loose sand surface and the die joint overlay film of mo(u)ld bottom half are sealed.The loose sand of filling out just becomes an integral body with mo(u)ld bottom half by vacuumizing like this, possesses some strength, guarantees after mould assembly the stable of core in casting process.

Further, for the core of two or more core prints, need only a core print 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 Fig. 4-2, Fig. 5-2, Fig. 5-3..

Further, this has case V method core manufacturing craft, makes the overlay film of V legal system core process, the operations such as the epiphragma simple possible that becomes.Can solve in the major part of V method casting, the manufacturing of large-scale core.And 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 manufacturing of heavy castings core.The advantage of having given full play to the casting of V method is the pioneering development of V method casting.

Accompanying drawing explanation

Fig. 1-1, Fig. 1-2, Fig. 1-3rd, " core sand case ", core box structure and coremaking schematic diagram

1-core sand case 2-case axle 3-suspension ring 4 sandbox vacuum tube joint 5-location core print 6-core 7-core box upper surface 8-" sandbox core print " 9-core box inwalls, outer wall 10-core box apperance 11-core box vacuum tube joint in figure

Fig. 2-1, Fig. 2-2, Fig. 2-3rd, the mould assembly schematic diagram of core and upper and lower type

Top view Fig. 2-3 that 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 are mo(u)ld bottom half and core (removing mo(u)ld top half) are for P is to view (band top box)

Fig. 3-3rd, the core box and the coremaking schematic diagram that by two minutes diaphragm capsules in left and right, are formed.Wherein " core sand case " is with arbor vacuum tube.Fig. 3-1, Fig. 3-2nd, " core sand case " sketch, has saved aspirating hole, screen pack of vacuum tube 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 tubes on the right side

Fig. 4-1, Fig. 4-2nd, the core box of pipe fitting, threeway class core, coremaking and lower core schematic diagram Fig. 4-1 are for later half core box and with the sandbox of arbor vacuum tube, coremaking schematic diagram.Fig. 4-2nd, lower core schematic diagram, " core sand case " is in the outside of sand mold.The later half core box 403-of 401-core sand case 402-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

Fig. 5-1, Fig. 5-3rd of Fig. 5-2., the core box of pipe joint core, coremaking and lower core schematic diagram Fig. 5-1 are for later half core box and with sandbox, the coremaking schematic diagram of arbor vacuum tube.Fig. 5-2, Fig. 5-3rd, lower core schematic diagram, " core sand case " is in the outside of sand mold.Later half core box 504 core box upper surface 505 alignment pins of 501-core sand case 502-arbor vacuum tube 503-or hole 506-core 507-mo(u)ld bottom half 508-foundry goods die cavity in figure

The specific embodiment

Core print design: in casting technique, general core has core print, the effect of core print is located and fixing 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 " mainly considers in lower core process, and the suspension ring of hanging " core sand case " can make core keep in the horizontal direction balance substantially, are convenient to lower core.

For longer core, can consider to hang core body part, but must be with soft band hanging, 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 be the core manufactured of this V method many " sandbox core print ", it is a part for core print, the location of core completes by locating core print, and " sandbox core print " do not play the role of positioning.When technological design, in sand mold, reserve the space that " sandbox core print " takies.And reserve enough gaps around at " sandbox core print ".Play like this in core process, " core sand case " do not contact with sand mold, is convenient to lower core, do not affect core location yet.

In sand mold, reserve the space that the vacuum tube joint of " core case " outer wall and suspension ring, case axle take, and retain certain interval, vacuum tube joint is 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 Fig. 4-2, Fig. 5-2.

" core sand case " design: " core sand case " structure is similar to common V method sandbox, is tank wall double layer hollow hermetically-sealed construction, and 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 Fig. 1-1, Fig. 1-2.Shown in Fig. 1-3.

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. 1-1, Fig. 1-3.

If core size is 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 are relevant to core size and shape, the extended sandbox lower surface of length extension is inner to core, make core internal vacuum even, increase the intensity of core.Vacuum tube also plays arbor effect, has more increased the intensity of core.Vacuum tube tube wall has breeder tube.Wall has stainless steel screen pack outward.See Fig. 5-1, Fig. 5-2.

The length of " core sand case " is exactly " sandbox core print ", length, both unified (containing built-in arbor vacuum tubes).See Fig. 1-1 and Fig. 2-1, Fig. 2-2.

The design of core box: core box apperance structure is similar to V method moulding apperance, is comprised of the apperance with vacuum tank, and vacuum tank is connected with vacuum line.The cavity shape of core box apperance is formed by core shape and the locating core head part of actual foundry goods, not containing " sandbox core print " part.The upper surface of core box is outwards to extend along the interface of locating core print and sandbox core print, forms a plane, and this plane is equivalent to the template face of common V method mould.It is smooth smooth that this plane is wanted, and boundary dimensions is slightly larger than the outer wall dimension of " core sand case ".As Fig. 1-1, Fig. 1-2

Manufacturing of core: first, core box is vacuumized, then the EVA film of heating is overlayed on to core box inner chamber and core box upper surface, EVA film will flow out minimum 50-80 mm wide surplus in sandbox surrounding.So that seal with sandbox outer wall.After overlay film finishing, at film surface spray paint, dry.

Then, at core box upper surface, put " core sand case "; Add sand, ram-jolt; Sandbox upper surface sand is struck off, cover common plastic film, sandbox surrounding flows out 50-80 mm wide surplus.While putting sandbox, note suspension ring, case axle and the vacuum tube joint position of sandbox, be convenient to the handling of core, lower core and mould assembly.

Vacuumize then to " core sand case ", reserved film is affixed to sandbox wall surface, sealing.

Be to remove core box vacuum again, the case axle of hanging " core sand case " carries out molding, makes core separated with core box, takes out core.

Finally core is placed on to cushion or above loose sand, changes the hanging position of core, by the case axle of hanging sandbox, changed into the suspension ring 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, after pouring, removes after a while.

Fig. 1-1st, " core sand case ", core box structure and coremaking schematic diagram;

Fig. 2-1, Fig. 2-2, Fig. 2-3rd, the mould assembly schematic diagram of core and mo(u)ld top half, mo(u)ld bottom half

Further, for compared with complex structure, an inconvenient core of direction depanning, core box adopts and is divided into two or polylith core box module, and each module has independently vacuum tank, and each core box intermodule has alignment pin location.For convenient minute diaphragm capsule, above core box, in parting direction, there is certain pattern draft.General 0 °-3 °.

The processing step of at this moment coremaking is: vacuumize → overlay film of matched moulds clamping → each module, spray paint, oven dry → put into vacuumize → each diaphragm capsule piece of sandbox → back-up sand ram-jolt → sandbox epiphragma → sandbox suitable for reading to go vacuum → molding (parting).

Further, after matched moulds, because core inner chamber lateral dimension is greater than core print size, make core box internal space ratio suitable for reading large, core box is recessed dark, the core that is difficult to overlay film, will be at the independent overlay film in surface (during overlay film, reserve minimum 50-80 millimeter surplus film outside overlay film surface, be beneficial to face seal) of the corresponding core of each core box module, each core box overlay film surface spraying material, carries out matched moulds, clamping afterwards.By above-mentioned processing step, down carry out again.After final molding, the unnecessary film of each core box module seam crossing is removed.With adhesive tape, along seam, paste again, avoid gas leakage.See Fig. 3-3, Fig. 4-1, Fig. 5-1

After lower core, " the sandbox core print " of use loose sand filling mo(u)ld bottom half gap around.With crooked chisel, prick several places of plastic sheeting between loose sand and mo(u)ld bottom half afterwards, make it to communicate.Then, then with plastic sheeting loose sand surface and the die joint overlay film of mo(u)ld bottom half are sealed.The loose sand of filling out just becomes an integral body with mo(u)ld bottom half by vacuumizing like this, possesses some strength, guarantees 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 Fig. 4-1, Fig. 4-2 and Fig. 5-1, Fig. 5-2

The enforcement of this programme is easily understood professional and technical personnel.The above case, signal do not limit the present invention.Within the spirit and principles in the present invention all, to do any modifications, are equal to replacement and improvement etc., within all should being included in protection scope of the present invention.

Claims

1. there is a case V method core manufacturing craft, be specially: during casting Technology Design, the core print of core is partly 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, and the moulding of V method is used in manufacturing of core, and processing step is: core box apperance vacuumizes, overlay film; Spray paint, oven dry; At core box upper surface, put into by " core sand case "; Add sand, ram-jolt; Strike off sandbox upper surface sand, epiphragma; " core sand case " vacuumizes, core box goes vacuum; Molding, coremaking complete.

2. according to there being case V method core manufacturing craft described in claims 1, it is characterized in that, made core is with sandbox, the tank wall of " core sand case " is double layer hollow hermetically-sealed construction, inwall has aspirating hole and screen pack, and material is iron and steel or other metals, and top box mouth contacts with plastic sheeting with nowel mouth, requirement is without burr, smooth, smooth, outer wall is provided with case axle, suspension ring, vacuum tube joint.

3. according to there being case V method core manufacturing craft described in claims 1, it is characterized in that, core location completes by location core print, and " sandbox core print " do not play the role of positioning, and in sand mold, at " sandbox core print ", reserves enough gaps (20-40 millimeter) around.

4. according to there being case V method core manufacturing craft described in claims 1 and 2, it is characterized in that, for larger sandbox (length of inwall is more than 1 meter), vacuum tube is set in sandbox, vacuum tube length and radial dimension are relevant to core size and shape, outside the extended case actinal surface of length, play on the one hand arbor effect; On the other hand, make the interior vacuum of core even, sand core strength is consistent, has increased the intensity of core, and vacuum tube tube wall has breeder tube, and wall has stainless steel screen pack outward.

5. according to there being case V method core manufacturing craft described in claims 1 and 2, it is characterized in that, described core box is the apperance structure with vacuum tank, vacuum tank outer wall is equipped with vacuum tube joint, the upper surface of core box is the interfacial epitaxial planar of location core print and sandbox mind, this plane is equivalent to the template face of common V method moulding apperance, contacts and overlay film during this face coremaking with " core sand case ", smooth smooth.

6. according to there being case V method core manufacturing craft described in claims 1 and 2, it is characterized in that, more complicated for structure, an inconvenient core of direction depanning, core box adopts and is divided into two or polylith diaphragm capsule piece, the molding from different directions of each module, and each module has independently vacuum tank, each core box intermodule has alignment pin location, and core box upper surface has pattern draft (0 °-3 °) along parting direction.

7. according to there being case V method core manufacturing craft described in claims 1 to 6, it is characterized in that.After core box matched moulds, because core lateral dimension is greater than core print size, make core box internal space ratio suitable for reading large, or core box is darker, is difficult to the core of overlay film, can be at the independent overlay film in surface of the corresponding core of each core box module.During overlay film, reserve minimum 50-80 millimeter surplus eva film (being beneficial to face seal) outside overlay film surface, each core box overlay film surface spraying material, dries.Carry out afterwards matched moulds, clamping.By above-mentioned processing step, down carry out again, after final molding, the unnecessary film of each core box module seam crossing is removed.With adhesive tape, along the seam of core box module, paste, avoid gas leakage, the method is highly suitable for manufacturing casing, pipe fitting (as straight-through, threeway, elbow), pump case, the manufacturing of valve body class sand cores of castings.

According to claims 1 to, described in 7, have case V method core manufacturing craft, it is characterized in that, for the core of two or more core prints, 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. according to there being case V method core manufacturing craft described in claims 1 to 8, it is characterized in that, " sandbox core print " around and between sand mold, leave gap, after lower core, gap the overlay film sealing of with loose sand, filling up mo(u)ld bottom half together vacuumize loose sand and mo(u)ld bottom half, became one, and increase core stability.

10. according to there being case V method core manufacturing craft described in claims 1 to 9, 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.