CN107962154B - A kind of forming method of large revolving body casting - Google Patents
A kind of forming method of large revolving body casting Download PDFInfo
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- CN107962154B CN107962154B CN201711234330.7A CN201711234330A CN107962154B CN 107962154 B CN107962154 B CN 107962154B CN 201711234330 A CN201711234330 A CN 201711234330A CN 107962154 B CN107962154 B CN 107962154B
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- sand core
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- outer profile
- casting
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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
- B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
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- 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
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
- B22C9/103—Multipart cores
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- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The present invention provides a kind of forming methods of large revolving body casting, solve traditional molding methods, high production cost, the long technology drawback of fabrication cycle, specific forming method are as follows: the molding cope down of the first cavity is formed by inner cavity sand core, second cavity and third cavity are formed by center sand core, casting structure of the outer profile slope less than 1, casting mold type chamber corresponding to it with the completely identical in structure outer profile sand core of the outer contour shape of the part casting by forming, the inner-cavity structure of the outer profile sand core is identical with the outer contour shape structure of inner cavity sand core, outer profile slope is greater than 1 casting structure, casting mold type chamber corresponding to it with the completely identical in structure apperance of the outer contour shape of the part casting by forming.The method of the present invention significantly reduces production cost and the production cycle of single-piece and small lot production large revolving body casting.
Description
Technical field
The invention belongs to the cast molding technology field of heavy castings more particularly to the molding sides of large revolving body class casting
Method.
Background technique
As shown in Figure 1 to Figure 3, water power rotary type casting has structure simple, and overall size variation is smaller, seamlessly transits
The features such as.Large revolving body class casting is produced using traditional molding methods, needs to make outer mold and core box, by casting mold and sand core
Casting produces such casting after assembly, but for the casting that single-piece or small lot produce, using traditional molding methods, production cost
It is high, and fabrication cycle is long.
Summary of the invention
When the present invention carries out single-piece or small lot production for large revolving body class casting, high production cost, fabrication cycle
Long technical problem proposes a kind of new formative method, and specific technical solution is as follows:
Large revolving body casting according to the present invention, outer profile are conical rotary table, and inner-cavity structure includes: mutually to interconnect
The first logical cavity, the second cavity, third cavity.
Specific forming method are as follows: the molding cope down of the first cavity is formed by inner cavity sand core, the second cavity and third cavity by
Center sand core is formed, casting structure of the outer profile slope less than 1, corresponding to casting mold type chamber by the foreign steamer with the part casting
The completely identical in structure outer profile sand core of profile shape is formed, the inner-cavity structure of the outer profile sand core and the foreign steamer profile of inner cavity sand core
Shape structure is identical, and outer profile slope is greater than 1 casting structure, corresponding to casting mold type chamber by outer with the part casting
The completely identical in structure apperance of chamfered shape is formed.
Further, the material of apperance is one of timber, metal, resin, evaporative pattern, preferably evaporative pattern, for
Single-piece or small lot production, the cost of evaporative pattern are low.
Further, the forming method of outer profile sand core are as follows: the coating gypsum coating on the outer surface of inner cavity sand core, then to
Inner cavity sand core upstream resin sand, after inner cavity sand core is coated completely by resin sand, with outer die face scraper plate around the center of inner cavity sand core
Axis rotation, forms the outer profile sand core after rotating a circle.Preferably, outer die face scraper plate is by rotary middle spindle and board group of strike-ofing
At, the surface that wherein stragith edge is contacted with molding sand, shape and structure is identical as the corresponding outer profile shape of generatrix structure of casting.
Further, the top design of apperance has the structure of the core print of the fixed center sand core.
Further, the forming method of the molding cope down of the first cavity are as follows: coat gypsum on the outer surface of inner cavity sand core
Coating, then outer profile sand core is placed on it, and the center overlapping of axles of inner cavity sand core and outer profile sand core, in outer profile sand core
Gypsum coating is coated on outer surface, the first sandbox is placed in the template for placing inner cavity sand core and outer profile sand core, to the first sand
Resin sand is flowed into case, the mould turnover after molding sand hardening, after taking out inner cavity sand core, then to placing the second sandbox above the first sandbox,
Resin sand is flowed into the second sandbox, molding is the molding cope down for forming first cavity after molding sand hardening.
Since casting structure is big, the geomery of the first cavity is also very big, inner cavity sand core is made using core box, then core
Box is just very huge, on the one hand at high cost, is on the other hand also unfavorable for execute-in-place, therefore the present invention is preferably, by multiple small
Sand core combines to form inner cavity sand core, specifically includes: the identical monomer sand core of multiple shape and structures and scraper plate striking sand core, Duo Gedan
Outer profile after body sand core and the combination of scraper plate striking sand core is identical with the shape, structure of first cavity.Wherein, scraper plate
The forming method of striking sand core are as follows: by multiple monomer sand cores combination after, to combination after sand core inner cavity in flow into resin sand, fill up
Sand core surface is struck off using plane scraper plate afterwards.The forming method of monomer sand core are as follows: fill out core sand into core box, be opened after hardening.
The forming method of large revolving body casting of the present invention, specific implementation step are as follows:
S1: preparation inner cavity sand core and center sand core；
S2: it prepares outer profile sand core: inner cavity sand core is placed in template, coat gypsum on the outer surface of inner cavity sand core
Coating, then to inner cavity sand core upstream resin sand, after the inner cavity sand is coated completely by resin sand, with outer die face scraper plate around described
The center axis rotation of inner cavity sand core forms the outer profile sand core after rotating a circle；
S3: it prepares top case: coating gypsum coating on the outer surface of outer profile sand core, put on the top of outer profile sand core
Apperance is set, the first sandbox is placed in the template described in step S2, is identified on outer profile sand core and apperance according to casting technique
Handle, subsidy, running gate system are hung in chill, test block, flow into resin sand into the first sandbox, and the mould turnover after molding sand hardening takes out inner cavity
After sand core, then to the second sandbox of placement above the first sandbox, it is according to casting technique mark riser, riser neck, subsidy, casting
System, flows into resin sand into the second sandbox, and the molding after molding sand hardening, the second sandbox forms top case；
S4: it prepares drag box: by the first mold turnover of sandbox in step S3, then molding, making the outer profile sand core and hardening
Sand mold afterwards is detached from, and the first sandbox forms drag box；
S5: the assembly center sand core in drag box after mould assembling, completes casting process.
The technical effects of the invention are that: 1. make outer profile sand core using outer die face scraper plate, eliminate the outer apperance of production
Process, reduce production cost, shorten the production cycle；2. making outer profile sand core on the sand core of inner cavity, on the one hand save
The usage amount of core sand, when still further aspect can guarantee the center overlapping of axles of two sand cores, top case and drag box mould assembling, on
The structure of lower mold can be to just, being not in dimensional discrepancy；3. in modeling process, on inner cavity sand core and outer profile sand core
Gypsum coating is coated, inner cavity sand core and outer profile sand core adhesion are prevented, prevents outer profile sand core and sand mold adhesion thereon；This hair
Obviously landing reduces production cost, shortens the production cycle.
Detailed description of the invention
Fig. 1 is a kind of outer profile structural schematic diagram of water power revolving body casting in specific embodiment；
Fig. 2 is a kind of inner-cavity structure schematic diagram of water power revolving body casting in specific embodiment；
Fig. 3 be in specific embodiment a kind of water power revolving body casting along the cross-sectional view of the plane by central axis；
Fig. 4 is the composed structure schematic diagram of inner cavity sand core in embodiment two；
Fig. 5 is the bottom view of Fig. 4；
Fig. 6 is the manufacturing process schematic diagram of outer profile sand core in specific embodiment；
Fig. 7 is the structural schematic diagram after outer profile sand core and apperance assembling；
Fig. 8 is the schematic diagram of nowel moulding in specific embodiment；
Fig. 9 is the schematic diagram in large revolving body casting forming method, in specific implementation step S3 after the first mold turnover of sandbox；
Figure 10 is the schematic diagram that technique information is identified in top box modeling process；
Schematic diagram when Figure 11 is top box moulding；
Figure 12 is the structural schematic diagram of top case；
Figure 13 is the structural schematic diagram after center sand core and drag box assembly；
Specific embodiment
In order to which technical problems, technical solutions and advantages to be solved are more clearly understood, tie below
Attached drawing is closed, the present invention is described in further details.It should be appreciated that specific embodiment described herein is only used to explain this
Invention, is not intended to limit the present invention.
The present embodiment by taking large-scale water power revolving body steel-casting as an example, the specific structure of the casting as shown in Fig. 1 to Fig. 3,
Outer profile is conical rotary table, and inner-cavity structure includes: the first interconnected cavity 1, the second cavity 2, third cavity 3.
Embodiment one
The specific forming method of the casting are as follows: the molding cope down of the first cavity 1 is formed by inner cavity sand core 5,2 He of the second cavity
Third cavity 3 is formed by center sand core 6, casting structure of the outer profile slope less than 1, corresponding to casting mold type chamber by with the portion
Divide the outer contour shape of casting the completely identical in structure formation of outer profile sand core 4, the inner-cavity structure of the outer profile sand core 4 and inner cavity
The outer contour shape structure of sand core 5 is identical, outer profile slope be greater than 1 casting structure, corresponding to casting mold type chamber by
With the completely identical in structure formation of apperance 10 of outer contour shape of the part casting.Wherein, apperance 10 is evaporative pattern, apperance 10
Top design have the fixed center sand core 6 core print structure,
As shown in fig. 6, the forming method of outer profile sand core 4 are as follows: gypsum coating is coated on the outer surface of inner cavity sand core 5,
Again to the upper resin sand of inner cavity sand core 5, after inner cavity sand core 5 is coated completely by resin sand, with outer die face scraper plate 7 around inner cavity sand core
5 center axis rotation forms the outer profile sand core 4 after rotating a circle.Wherein, outer die face scraper plate 7 is by rotary middle spindle 71
It is formed with stragith edge 72, the surface that wherein stragith edge 72 is contacted with molding sand, the outer profile bus of shape and structure and corresponding casting
Shape and structure is identical.
The forming method of the molding cope down of first cavity 1 are as follows: gypsum coating is coated on the outer surface of inner cavity sand core 5, then
Outer profile sand core 4 is placed on it, and the center overlapping of axles of inner cavity sand core 5 and outer profile sand core 4, in the outer of outer profile sand core 4
Gypsum coating is coated on surface, the first sandbox 91 is placed in the template for placing inner cavity sand core 5 and outer profile sand core 4, to first
Resin sand is flowed into sandbox, the mould turnover after molding sand hardening, after taking out inner cavity sand core 5, then to placing second above the first sandbox 91
Sandbox 92 flows into resin sand into the second sandbox 92, and the molding that molding forms first cavity 1 after molding sand hardening is hung
Tire 8.
The forming method of large-scale water power revolving body steel-casting, specific implementation step are as follows:
S1: preparation inner cavity sand core 5 and center sand core 6；
S2: it prepares outer profile sand core 4: inner cavity sand core 5 is placed in template, coated on the outer surface of inner cavity sand core 5
Gypsum coating, then to the upper resin sand of inner cavity sand core 5, after inner cavity sand core 5 is coated completely by resin sand, with outer die face scraper plate 7
Around the center axis rotation of the inner cavity sand core 5, outer profile sand core 4 is formed after rotating a circle；
S3: it prepares top case: gypsum coating is coated on the outer surface of outer profile sand core 4, as shown in fig. 7, in outer profile
Apperance 10 is placed on the top of sand core 4, places the first sandbox 91 in the template described in step S2, according to casting technique described outer
Chill, test block are identified on profile sand core 4 and apperance 10, hangs handle, subsidy, running gate system, flow into resin sand into the first sandbox 91,
The mould turnover after molding sand hardening, after taking out inner cavity sand core 5, then to the second sandbox 92 is placed above the first sandbox 91, according to founder
Skill identifies riser, riser neck, subsidy, running gate system, flows into resin sand into the second sandbox 92, the molding after molding sand hardening, the
Two sandboxes form top case, as shown in figure 12；
S4: prepare drag box: by 91 mould turnover of the first sandbox in step S3, then molding, make the outer profile sand core 4 with it is hard
Sand mold after change is detached from, and the first sandbox forms drag box；
S5: as shown in figure 13, the assembly center sand core 6 in drag box after mould assembling, completes casting process.
Above-mentioned steps S3 and S4 is as shown in Figs. 8 to 11.
Embodiment two
On the basis of example 1, inner cavity sand core 5 is improved, combines it by multiple small sand cores and is formed, such as Fig. 4
With shown in Fig. 5, specific structure includes: the identical monomer sand core 51 of 6 shape and structures and scraper plate striking sand core 52, multiple monomer sand
Outer profile after core 51 and scraper plate striking sand core 52 combine is identical with the shape, structure of the first cavity 1.Wherein, scraper plate is scraped
The forming method of sand core 52 processed are as follows: by multiple monomer sand cores 51 combination after, to combination after sand core inner cavity in flow into resin sand, fill out
Sand core surface is struck off using plane scraper plate 11 after full.The forming method of monomer sand core 51 are as follows: fill out core sand into core box, opened after hardening
Mould.
The embodiment, the specific steps of casting forming method are identical with implementing one.
The above is merely preferred embodiments of the present invention, be not intended to limit the invention, it is all in spirit of the invention and
Made any modifications, equivalent replacements, and improvements etc. within principle, should all be included in the scope of the present invention.
Claims (9)
1. a kind of forming method of large revolving body casting, the outer profile of the large revolving body casting is conical rotary table, inner cavity
Structure includes: interconnected the first cavity (1), the second cavity (2), third cavity (3), which is characterized in that
The molding cope down of first cavity (1) is formed by inner cavity sand core (5)；
Second cavity (2) and third cavity (3) are formed by center sand core (6)；
Casting structure of the outer profile slope less than 1, corresponding to casting mold type chamber by the outer contour shape knot with the part casting
The identical outer profile sand core (4) of structure is formed, the inner-cavity structure of the outer profile sand core (4) and the outer profile of inner cavity sand core (5)
Shape and structure is identical；
Outer profile slope be greater than 1 casting structure, corresponding to casting mold type chamber by the outer contour shape knot with the part casting
The identical apperance of structure (10) formation；
The forming method of the molding cope down of first cavity (1) are as follows: coat gypsum on the outer surface of the inner cavity sand core (5)
Coating, then the outer profile sand core (4) is placed on it, and the center of the inner cavity sand core (5) and the outer profile sand core (4)
Overlapping of axles coat gypsum coating on the outer surface of the outer profile sand core (4), are placing the inner cavity sand core (5) and described
The first sandbox (91) are placed in the template of outer profile sand core (4), flow into resin sand into the first sandbox, are turned over after molding sand hardening
Case after taking out the inner cavity sand core (5), then to placement the second sandbox (92) above the first sandbox, tree is flowed into the second sandbox
Rouge sand, molding is the molding cope down (8) for forming first cavity (1) after molding sand hardening.
2. a kind of forming method of large revolving body casting according to claim 1, which is characterized in that the apperance (10)
Material be one of timber, metal, resin, evaporative pattern.
3. a kind of forming method of large revolving body casting according to claim 1, which is characterized in that the outer profile sand
The forming method of core (4) are as follows: gypsum coating is coated on the outer surface of the inner cavity sand core (5), then to the inner cavity sand core (5)
Upper resin sand, after the inner cavity sand core (5) is coated completely by resin sand, with outer die face scraper plate (7) around the inner cavity sand core
(5) center axis rotation forms the outer profile sand core (4) after rotating a circle.
4. a kind of forming method of large revolving body casting according to claim 3, which is characterized in that the outer die face is scraped
Plate (7) is made of rotary middle spindle (71) and stragith edge (72), the surface that wherein stragith edge (72) is contacted with molding sand, shape knot
Structure is identical as the corresponding outer profile shape of generatrix structure of casting.
5. a kind of forming method of large revolving body casting according to claim 1, which is characterized in that the inner cavity sand core
(5) include: the identical monomer sand core (51) of multiple shape and structures and scraper plate striking sand core (52), multiple monomer sand cores (51) and scrape
Outer profile after plate striking sand core (52) combination is identical with the shape, structure of first cavity (1).
6. a kind of forming method of large revolving body casting according to claim 5, which is characterized in that the scraper plate striking
The forming method of sand core (52) are as follows: by multiple monomer sand cores (51) combination after, to combination after sand core inner cavity in flow into resin sand,
Sand core surface is struck off using plane scraper plate (11) after filling up.
7. a kind of forming method of large revolving body casting according to claim 5, which is characterized in that the monomer sand core
(51) forming method are as follows: fill out core sand into core box, be opened after hardening.
8. a kind of forming method of large revolving body casting according to claim 1, which is characterized in that the apperance (10)
Top design have the fixed center sand core (6) core print structure.
9. a kind of forming method of large revolving body casting according to claim 3 or 5, which is characterized in that the molding
The specific steps of method are as follows:
S1: the inner cavity sand core (5) and center sand core (6) are prepared；
S2: it prepares the outer profile sand core (4): the inner cavity sand core (5) is placed in template, in the inner cavity sand core (5)
Outer surface on coat gypsum coating, then to the upper resin sand of the inner cavity sand core (5), when the inner cavity sand core (5) is by resin
After sand coats completely, with outer die face scraper plate (7) around the center axis rotation of the inner cavity sand core (5), institute is formed after rotating a circle
State outer profile sand core (4)；
S3: it prepares top case: gypsum coating is coated on the outer surface of the outer profile sand core (4), in the outer profile sand core
(4) apperance (10) is placed on top, is placed the first sandbox (91) in the template described in step S2, is existed according to casting technique
Chill, test block are identified on the outer profile sand core (4) and apperance (10), hangs handle, subsidy, running gate system, are flowed into the first sandbox
Enter resin sand, the mould turnover after molding sand hardening, after taking out the inner cavity sand core (5), then to placing the second sandbox above the first sandbox
(92), riser, riser neck, subsidy, running gate system are identified according to casting technique, resin sand is flowed into the second sandbox, to molding sand
Molding after hardening, the second sandbox form top case；
S4: drag box is prepared: by the first mold turnover of sandbox in step S3, then molding, after making the outer profile sand core (4) and hardening
Sand mold be detached from, the first sandbox forms drag box；
S5: assembly drag box and top case complete moulding by casting process.
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| CN109454205B (en) * | 2018-12-13 | 2024-01-26 | 淮海工业集团有限公司 | Sand mould of curved surface revolution body |
| CN109396340B (en) * | 2018-12-26 | 2020-06-30 | 黄石新兴管业有限公司 | Casting process method for manufacturing large-scale gray cast iron bottom plate |
| CN111408692B (en) * | 2020-03-30 | 2021-09-14 | 共享铸钢有限公司 | Method for forming cylinder block |
| CN111558696B (en) * | 2020-05-22 | 2022-05-13 | 共享铸钢有限公司 | Forming method of ring-shaped steel casting |
| CN113134570B (en) * | 2021-03-30 | 2023-01-06 | 共享铸钢有限公司 | Modeling method for large-scale curved surface structure casting |
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