CN112705674A - Simple method for arranging chilling blocks in 3DP printing sand mold - Google Patents
Simple method for arranging chilling blocks in 3DP printing sand mold Download PDFInfo
- Publication number
- CN112705674A CN112705674A CN201911020276.5A CN201911020276A CN112705674A CN 112705674 A CN112705674 A CN 112705674A CN 201911020276 A CN201911020276 A CN 201911020276A CN 112705674 A CN112705674 A CN 112705674A
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- CN
- China
- Prior art keywords
- sand mold
- chilling
- block
- sand
- casting
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- B22C9/02—Sand moulds or like moulds for shaped castings
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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
- B22C9/12—Treating moulds or cores, e.g. drying, hardening
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D15/00—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
Abstract
The invention relates to the casting industry, and provides a simple method for 3DP printing of chill in a sand mold, which mainly solves the problem that the chill needs to be arranged in the sand mold because shrinkage porosity is generated at a hot spot of a casting when the sand mold is printed. And reserving a space for placing the chill in the sand mold, coating a casting type binder on the back and the side of the chill after the sand mold is printed, bonding the sand mold, brushing a coating on the front of the chill, the side seam where the chill is matched with the sand mold, drying, and then closing the box for pouring. By applying the method, the process yield of the casting is improved, the product quality is improved, and the defects of printing sand casting are reduced. The effects of rapid trial production of casting samples and small-batch production are realized.
Description
Technical Field
The invention relates to the casting industry, and aims to solve the problem that a chill cannot be embedded during printing a sand mold, and the method is suitable for molding large complex castings, improves the process yield, the product quality and the geometric dimension precision of the castings, and reduces the defects of manufacturing the castings by printing the sand mold. The progress of trial-production of casting samples and small-batch production is accelerated. The sand-iron ratio is high, and the requirement of environmental protection production is met.
Background
The large complex casting has high geometric dimension precision, small matching error between the key contour surface and the three-dimensional figure contour surface, even unsmooth transition between a curved surface and a plane, between the curved surface and the curved surface, and accurate matching between the manual molding shape and the sand core, so that the large casting with high precision and sharp end can be manufactured only by adopting a 3DP printing sand mold.
Disclosure of Invention
The invention aims to provide a simple method for 3DP printing of chill in a sand mold, which mainly solves the problem that the chill needs to be arranged in the sand mold because a casting is prevented from generating shrinkage porosity at a hot spot when the sand mold is printed. And reserving a space for placing a chill in the sand mold, coating a casting type adhesive on the back and the side of the chill after printing the sand mold to bond the sand mold, scraping side seams by using a high-concentration alcohol-based zircon powder coating, brushing the alcohol-based zircon powder coating for 2-3 times on the chill and the inner cavity surface of the molding sand, brushing the coating on the side seams at the front of the chill, matching the chill and the sand mold, drying, and then pouring in a box. The process yield of the casting is improved, the product quality is improved, and the defects of printing sand casting are reduced. The progress of trial-production of casting samples and small-batch production is accelerated.
The embodiment of the invention provides a simple method for 3DP printing of chilling blocks in sand molds, which comprises the following steps: preparing in an early stage, determining a process scheme, designing a sand mold, designing a chilling block, performing MAGMA simulation, bonding the chilling block, brushing coating, drying, combining boxes and pouring; the key process contents are as follows:
determining a process scheme: according to the geometric dimension of a casting drawing, designing the specification and the number of feeding heads, the specification and the number of a pouring system, the specification and the number of cold iron positions, an air outlet channel, a pouring cup and an air outlet hole, and determining the shape and the three-dimensional dimension of a printing sand mold and a sand core, wherein the sand mold and the sand core are made of alkali phenolic resin self-hardening sand, and the cold iron piece is made of nodular cast iron; a space for placing the chilling blocks is reserved when the sand mould is designed, and the three-dimensional size of the space is 0.5-2mm larger than that of the chilling blocks; taking a small value when the shape of the chilling block is small, and taking a large value when the shape of the chilling block is large; when designing the chiller, the factor that the chiller expands under high temperature is considered, the three-dimensional geometric dimension of the chiller is 1-3mm smaller than the geometric dimension of the reserved three-dimensional space of the sand mold, the small value is taken when the chiller block type is small, the large value is taken when the chiller block type is large, the chiller is processed by attaching the chiller to the cavity surface of the casting, and the roughness reaches below Ra6.3 mu m; when the cold iron block is embedded into the reserved space of the sand mold, the cold iron and the molding sand are bonded by using a casting type adhesive, the side seam is strickled off by using high-concentration alcohol-based zircon powder coating, the cold iron and the inner cavity surface of the molding sand are brushed with the alcohol-based zircon powder coating for 2-3 times, the combined part of the cold iron and the molding sand is dried by using flame, the sand mold enters the furnace and is heated to 180 degrees centigrade and 200 degrees centigrade, and the heat is preserved for 8-12 hours.
Drawings
FIG. 1 is a schematic view of the structure of the present invention
Wherein: 1. sand mould, 2, feeding head, 3, sand core, 4, pouring gate system, 5, gas outlet channel, 6, pouring cup, 7, gas outlet hole, 8, chill, 9, casting adhesive, 10 and casting cavity.
The invention has the positive effects that:
the chill is arranged in the printing sand mold, the key contour surface of the casting is in accordance with the contour surface of the three-dimensional drawing, the error is small, the curved surface is in smooth transition with the plane, the curved surface and the curved surface, the process yield of the casting is improved, the casting is prevented from being shrunk at a hot spot, the casting defect of the printing sand mold is reduced, the product quality is high, the trial casting samples are realized, and the effect of quick small-batch production progress is achieved.
Detailed Description
The actual operation is implemented as follows: preparing in an early stage, determining a process scheme, designing a sand mold, designing a chilling block, performing MAGMA simulation, bonding the chilling block, brushing coating, drying, combining boxes and pouring;
the specific method comprises the following steps:
the preliminary preparation work is done, the pattern of the casting 10 is familiar, and the three-dimensional perspective view of the casting 10 is drawn.
Evaluating and determining a process scheme, designing the specification and the number of feeding heads 2, the specification and the number of a pouring system 4, the position specification and the number of chills 8, a gas outlet channel 5, a pouring cup 6 and a gas outlet hole 7, and determining the shape and the three-dimensional size of a printing sand mould according to the geometric dimension of a three-dimensional stereograph, wherein the sand mould material is alkali phenolic resin self-hardening sand, and the chiller material piece is nodular cast iron;
a space for placing a chiller 8 is reserved when the sand mould 1 is designed, and the three-dimensional size of the space is 0.5-2mm larger than that of the chiller; when 8 blocks of the chilling block are small, the small value is taken, and when 8 blocks of the chilling block are large, the large value is taken;
when designing the chilling block 8, the factor that the chilling block expands under high temperature is considered, the three-dimensional geometric dimension of the chilling block is 1-3mm smaller than the geometric dimension of the reserved three-dimensional space of the sand mould 1, the small value is taken when the chilling block 8 is small, the large value is taken when the chilling block 8 is large, and the processing roughness of the surface of the chilling block 8, which is close to the casting cavity 10, is less than Ra6.3 mu m;
after the whole set of process module is designed, the MAGMA software is used for simulating the solidification result, the process rationality is verified, the defect-free process is completed, the defect is produced, after the process scheme is modified, the solidification result is simulated again until the defect-free process is completed, the chill 8 is manufactured on the basis of qualified process evaluation, and a 3DP printer is started to manufacture the sand mold.
Printing a sand mold 1 and a sand core 3, when a chill block is embedded into a reserved space of the sand mold 1, bonding a chill 8 and the sand mold 1 by using a casting type adhesive 9, scraping a side seam by using a high-concentration alcohol-based zircon powder coating, brushing the alcohol-based zircon powder coating for 2-3 times on the surface of the chill 8 and the inner cavity of the sand mold 1, drying the joint part of the chill 8 and the sand mold 1 by using flame, heating the sand mold 1 in a furnace to 160-fold sand-adding 200 ℃, preserving heat for 8-12 hours, taking the sand mold out of the furnace after drying, placing a core joint box, inscribing argon in a cavity, and waiting for pouring.
Claims (5)
1. A simple method for 3DP printing of internal chill of a sand mold comprises the following steps: preparing in an early stage, determining a process scheme, designing a sand mold (1), designing a chilling block (8), MAGMA simulation, adhering the chilling block (8), brushing coating, drying, assembling a box and pouring.
2. The simple method for manufacturing the internal chill of the 3DP printing sand mold according to claim 1, is characterized by determining a process scheme: according to the geometric dimension of a casting (10), the specification and the number of feeding heads (2), the specification and the number of a pouring system (4), the position specification and the number of chills (8), an air outlet channel (5), a pouring cup (6) and an air outlet hole (7) are designed, the shapes and the three-dimensional dimensions of a printing sand mold (1) and a sand core (3) are determined, the sand mold (1) and the sand core (3) are made of alkali phenolic resin self-hardening sand, and a chill (8) part is made of nodular cast iron.
3. The simple method for arranging the chilling blocks in the 3DP printing sand mold according to claim 1, wherein a space for placing the chilling blocks (8) is reserved when the sand mold (1) and the sand core (3) are designed, and the three-dimensional size of the space is 0.5-2mm larger than that of the chilling blocks (8); the small value is taken when the cold iron (8) block type is small, and the large value is taken when the cold iron (8) block type is large.
4. The simple method for arranging the chilling block in the 3DP printing sand mold according to claim 1, wherein the factor that the chilling block (8) expands due to high temperature is considered when the chilling block (8) is designed, the three-dimensional geometric dimension of the chilling block (8) is 1-3mm smaller than the geometric dimension of the reserved three-dimensional space of the sand mold (1), the small value is taken when the block shape of the chilling block (8) is small, the large value is taken when the block shape of the chilling block (8) is large, the surface of the chilling block (8) attached to the casting cavity (10) is processed, and the roughness reaches below Ra6.3 μm.
5. The simple method for installing the chilling block in the 3DP printing sand mold according to claim 1, wherein when the chilling block (8) is embedded into the reserved space of the sand mold (1), the chilling block (8) is bonded with the sand mold (1) through a casting type adhesive (9), the side seam is leveled by using a high-concentration alcohol-based zircon powder coating, the alcohol-based zircon powder coating is brushed for 2-3 times on the chilling block (8) and the inner cavity surface of the sand mold (1), the joint of the chilling block (8) and the sand mold (1) is dried through flame, and the sand mold (1) enters a furnace to be heated to 180-fold temperature of 200 ℃ and is kept warm for 8-12 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911020276.5A CN112705674A (en) | 2019-10-25 | 2019-10-25 | Simple method for arranging chilling blocks in 3DP printing sand mold |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911020276.5A CN112705674A (en) | 2019-10-25 | 2019-10-25 | Simple method for arranging chilling blocks in 3DP printing sand mold |
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| CN112705674A true CN112705674A (en) | 2021-04-27 |
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| CN201911020276.5A Pending CN112705674A (en) | 2019-10-25 | 2019-10-25 | Simple method for arranging chilling blocks in 3DP printing sand mold |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114210944A (en) * | 2021-11-29 | 2022-03-22 | 四川维珍高新材料有限公司 | Composite 3D printing preparation method of casting sand mold with chilling block and casting sand mold |
| CN115319021A (en) * | 2022-06-27 | 2022-11-11 | 日月重工股份有限公司 | Method for producing large steel casting through 3D printing |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106862494A (en) * | 2017-02-28 | 2017-06-20 | 宁夏共享模具有限公司 | A kind of preparation method of the 3D printing core with direct-cooled chill |
| CN107282892A (en) * | 2017-07-21 | 2017-10-24 | 北京航星机器制造有限公司 | A kind of 3D printing core formative method of aluminium alloy castings |
| CN107962165A (en) * | 2017-12-11 | 2018-04-27 | 云南昆船机械制造有限公司 | A kind of casting method of the molding assembly chill in 3D printing resin sand core |
| CN109954857A (en) * | 2019-04-26 | 2019-07-02 | 共享装备股份有限公司 | The fixing tool and fixing means of 3D printing sand mold chill |
-
2019
- 2019-10-25 CN CN201911020276.5A patent/CN112705674A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106862494A (en) * | 2017-02-28 | 2017-06-20 | 宁夏共享模具有限公司 | A kind of preparation method of the 3D printing core with direct-cooled chill |
| CN107282892A (en) * | 2017-07-21 | 2017-10-24 | 北京航星机器制造有限公司 | A kind of 3D printing core formative method of aluminium alloy castings |
| CN107962165A (en) * | 2017-12-11 | 2018-04-27 | 云南昆船机械制造有限公司 | A kind of casting method of the molding assembly chill in 3D printing resin sand core |
| CN109954857A (en) * | 2019-04-26 | 2019-07-02 | 共享装备股份有限公司 | The fixing tool and fixing means of 3D printing sand mold chill |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114210944A (en) * | 2021-11-29 | 2022-03-22 | 四川维珍高新材料有限公司 | Composite 3D printing preparation method of casting sand mold with chilling block and casting sand mold |
| CN114210944B (en) * | 2021-11-29 | 2023-11-17 | 四川维珍高新材料有限公司 | Composite 3D printing preparation method of casting sand mold with chill and casting sand mold |
| CN115319021A (en) * | 2022-06-27 | 2022-11-11 | 日月重工股份有限公司 | Method for producing large steel casting through 3D printing |
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Application publication date: 20210427 |
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| RJ01 | Rejection of invention patent application after publication |