CN113333673A - Quick preparation method of resin sand casting mold - Google Patents
Quick preparation method of resin sand casting mold Download PDFInfo
- Publication number
- CN113333673A CN113333673A CN202110558289.9A CN202110558289A CN113333673A CN 113333673 A CN113333673 A CN 113333673A CN 202110558289 A CN202110558289 A CN 202110558289A CN 113333673 A CN113333673 A CN 113333673A
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- Prior art keywords
- melting
- casting
- low
- resin sand
- point pattern
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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
- B22C9/04—Use of lost patterns
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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
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
- B22C7/02—Lost 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
- B22C9/04—Use of lost patterns
- B22C9/043—Removing the consumable pattern
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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
- B33Y80/00—Products made by additive manufacturing
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The invention relates to the technical field of sand casting, in particular to a method for quickly preparing a resin sand casting mold. The method comprises the following steps: s1: preparing a low-melting-point pattern by adopting a 3D printing method, wherein the low-melting-point pattern has the same configuration as a casting to be cast; s2: adhering a chilling block to the surface of the low-melting-point pattern corresponding to the part of the casting to be cast, which needs to increase the cooling speed; s3: uniformly coating an anti-seepage coating on the surface of the low-melting-point pattern; s4, placing the low-melting-point pattern coated in the step S3 into resin sand, tightly filling gaps among the low-melting-point pattern with the resin sand, tamping the resin sand, and solidifying the resin sand; s5, removing the low-melting-point pattern by heating, and pouring alloy liquid into the resin sand casting cavity; s6: and after cooling casting is finished, removing the resin sand and taking out the casting. The invention can realize the ultra-fast casting process of 'no mould, no core design', reduce the delivery cycle of the casting by more than 50%, and improve the dimensional accuracy of the casting to more than CT 8.
Description
Technical Field
The invention relates to the technical field of sand casting, in particular to a method for quickly preparing a resin sand casting mold.
Background
In the casting process preparation stage (before production), after the casting pouring scheme (including a pouring system and pouring process parameters) is designed, the core design is carried out based on the three-dimensional modeling of the pouring system, and then the mold design and manufacturing are carried out, or the sand core is printed and sintered, and finally the casting mold is assembled for pouring. Rapid molding and casting is difficult to achieve due to the long cycle of core design, mold manufacturing, or core printing or sintering. In the core design, mold design and mold manufacturing process, a great deal of labor and material cost is consumed in the process preparation stage of the casting, and about (30-50)% of the development period is occupied.
The existing resin sand casting mold preparation method comprises the following steps: machining the whole regular sand block, forming by 3D printing (ink jet method), forming by SLS (selective laser sintering), and making sand mold by metal mold and pounding. The sand mold preparation method related by the invention is different from the 4 sand molds. In addition, because the casting obtained by the traditional method needs to be divided into a plurality of sand cores and sand molds, the size problems of flash, box staggering and the like can occur in the combination process, and the casting is scrapped due to the size out-of-tolerance.
Disclosure of Invention
The purpose of the invention is as follows: the method comprises the steps of preparing a low-melting-point casting pattern by using a 3D printing technology, brushing an anti-invasion coating on the pattern to replace a metal mold, and placing the pattern on a molding line for molding, dewaxing and pouring, so that an ultra-fast casting process of 'mold-free and core-free design' is realized, the delivery cycle of the casting is reduced by more than 50%, and the dimensional precision of the casting is improved to more than CT 8.
The technical scheme of the invention is as follows: in order to achieve the purpose, the invention provides a method for quickly preparing a resin sand casting mold, which comprises the following steps:
s1: preparing a low-melting-point pattern by adopting a 3D printing method, wherein the low-melting-point pattern has the same configuration as a casting to be cast;
s2: adhering a chilling block to the surface of the low-melting-point pattern corresponding to the part of the casting to be cast, which needs to increase the cooling speed;
s3: uniformly coating an anti-seepage coating on the surface of the low-melting-point pattern;
s4, placing the low-melting-point pattern coated in the step S3 into resin sand, tightly filling gaps among the low-melting-point pattern with the resin sand, tamping the resin sand, and solidifying the resin sand;
s5, removing the low-melting-point pattern by heating, and pouring alloy liquid into the resin sand casting cavity;
s6: and after cooling casting is finished, removing the resin sand and taking out the casting.
In one possible embodiment, in step S1, the low-melting-point pattern material is a 3D printable material that melts at 70-80 ℃.
Preferably, the low-melting point pattern material may be one of polystyrene powder and polymethyl methacrylate powder. Because the powder of the pattern is much finer than that of the 3D printing sand mold, the size precision is better than that of the existing 3D printing sand mold.
In one possible embodiment, in step S2, the cold iron block is adhered by the low melting point pattern material. The method has the advantages that the method does not need to adopt means such as pins or magnets to fix the chiller, reduces the number of tools, does not need to design positioning holes on the chiller, and reduces the processing cost of the tools.
In one possible embodiment, in the step S3, the anti-permeation coating includes corundum powder and silica sol, a ratio of the silica sol to the corundum powder is 1: 3.5-4.2, and the corundum powder is Al2O3Powder with a particle size of 800 mesh or more. The impermeable coating is coated on the surface of the pattern and the chill to prevent the molten pattern from permeating into the casting mold.
In one possible embodiment, in step S4, the resin sand may be one of coated sand and self-hardening sand.
In one possible embodiment, in step S5, the heating temperature is controlled to be 220 to 300 ℃ and the holding time is 2 to 3 hours. Because the melting temperature of the pattern material is lower than the decomposition temperature of the resin in the molding sand, when the pattern is melted, the tempering treatment of the molding sand can be simultaneously carried out, the volatile substances which are more than in the molding sand are removed, and the gas generation during the pouring can be effectively avoided, so that the defect of invasive air holes is formed.
In one possible embodiment, in step S6, the resin sand is removed by vibration.
The invention has the beneficial effects that: the invention utilizes 3D printing technology to prepare a casting pattern with low melting point, and the pattern is brushed with anti-invasion coating to replace a metal mold and placed on a molding line for molding, dewaxing and pouring, thereby realizing the ultra-fast casting process of 'no mold and no core design', reducing the delivery cycle of the casting by more than 50 percent, and improving the dimensional precision of the casting to be more than CT 8.
Drawings
FIG. 1 is a schematic diagram of the preparation method of the preferred embodiment of the present invention
Wherein:
1-riser pattern; 2-casting mould sample; 3-pouring channel model; 4-chilling; 5-a coating layer; 6-resin sand; 7-casting mould cavity; 8-casting and casting head.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so that those skilled in the art can understand and read the present invention, and do not limit the conditions for implementing the present invention, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the functions and purposes of the present invention, should still fall within the scope of the present invention.
As shown in fig. 1, a method for rapidly preparing a resin sand mold comprises the following steps:
s1: preparing a low-melting-point pattern by adopting a 3D printing method, wherein the low-melting-point pattern has the same configuration as a casting to be cast, and the low-melting-point pattern consists of a riser pattern 1, a casting pattern 2 and a pouring gate pattern 3; the low-melting-point die sample is obtained by using a 3D printing technology and comprises a casting pouring system structure, a de-waxing system structure and the like, and the low-melting-point die sample can be made of common low-temperature wax materials or 3D printable materials which are melted at 70-80 ℃, such as PS powder and PMMA powder;
s2: adhering a chilling block to the surface of the low-melting-point pattern corresponding to the part of the casting to be cast, which needs to increase the cooling speed; dipping a thin layer of melting die sample material on the working surface of the chilling block, wherein the chilling block is made of one of cast iron, copper or aluminum and is adhered to the surface of a part needing to increase the cooling speed; the part needing to increase the cooling speed comprises a large thick part of the casting or other parts needing machine cooling;
s3: uniformly coating an anti-seepage coating on the surface of the low-melting-point pattern; the anti-seepage coating comprises corundum powder and silica sol, the ratio of the silica sol to the corundum powder is 1:4.0, and the corundum powder is Al2O3Powder;
s4: pounding sand, preparing a casting mold, placing the low-melting-point mold which is coated in the step S3 into resin sand, tightly filling gaps among the low-melting-point mold with the resin sand, adjusting the amount of the resin sand according to production requirements, tamping the resin sand, solidifying the resin sand, and moving or clamping after the resin sand is completely solidified;
s5: removing the low-melting-point pattern by heating, transferring the sand mold and the pattern into a heating furnace, controlling the heating temperature to be 220-300 ℃, keeping the temperature for 2-3 hours, obtaining a casting mold cavity with the same shape as the pattern after the pattern is molten and discharging the casting mold from a preset channel, and pouring alloy liquid after the casting mold is cooled to room temperature or the temperature specified by the casting process;
s6: and removing the box and taking out the casting. After the pouring is finished, after the alloy liquid is cooled to the room temperature, the molding sand is removed by means of vibration and the like, and then a casting and a casting head are obtained.
Taking 3D printing of a PS powder pattern as an example, experiments are carried out on a magnesium-aluminum alloy product to obtain a sample piece, the structure of the sample piece can be cast and formed, and X-ray and fluorescence inspection are used to know that the metallurgical performance of the sample piece is good and casting defects such as air holes and pinholes do not exist.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equally replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application, and are intended to be included within the scope of the present application.
Claims (8)
1. A method for quickly preparing a resin sand casting mold is characterized by comprising the following steps:
s1: preparing a low-melting-point pattern by adopting a 3D printing method, wherein the low-melting-point pattern has the same configuration as a casting to be cast;
s2: adhering a chilling block to the surface of the low-melting-point pattern corresponding to the part of the casting to be cast, which needs to increase the cooling speed;
s3: uniformly coating an anti-seepage coating on the surface of the low-melting-point pattern;
s4, placing the low-melting-point pattern coated in the step S3 into resin sand, tightly filling gaps among the low-melting-point pattern with the resin sand, tamping the resin sand, and solidifying the resin sand;
s5, removing the low-melting-point pattern by heating, and pouring alloy liquid into the resin sand casting cavity;
s6: and after cooling casting is finished, removing the resin sand and taking out the casting.
2. The method as claimed in claim 1, wherein in step S1, the low-melting-point pattern material is selected from a 3D printable material with a melting point of 200-300 ℃ and a melting point of 70-80 ℃.
3. The method for rapidly preparing the resin sand mold as claimed in claim 2, wherein the low-melting-point mold sample material is selected from one of polystyrene powder and polymethyl methacrylate powder.
4. The method as claimed in any one of claims 1 to 3, wherein in step S2, the cold iron block is adhered by the low melting point pattern material.
5. The method for rapidly preparing the resin sand mold as claimed in claim 1, wherein in the step S3, the anti-permeation coating comprises corundum powder and silica sol, the ratio of the silica sol to the corundum powder is 1: 3.5-4.2, and the corundum powder is Al2O3Powder with a particle size of 800 mesh or more.
6. The method as claimed in claim 1, wherein in step S4, the resin sand is selected from coated sand and self-hardening sand.
7. The method for rapidly preparing the resin sand mold as claimed in claim 1, wherein in step S5, the heating temperature is controlled to be 220-240 ℃ and the holding time is 2-3 hours.
8. The method of claim 1, wherein in step S6, the resin sand is removed by vibration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110558289.9A CN113333673A (en) | 2021-05-21 | 2021-05-21 | Quick preparation method of resin sand casting mold |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110558289.9A CN113333673A (en) | 2021-05-21 | 2021-05-21 | Quick preparation method of resin sand casting mold |
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| CN113333673A true CN113333673A (en) | 2021-09-03 |
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| CN202110558289.9A Pending CN113333673A (en) | 2021-05-21 | 2021-05-21 | Quick preparation method of resin sand casting mold |
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Citations (8)
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|---|---|---|---|---|
| JPH06166255A (en) * | 1992-11-30 | 1994-06-14 | Fukutoku Sangyo Kk | Formation of indented character, mark, etc., on surface of metal plate |
| CN106238670A (en) * | 2016-09-19 | 2016-12-21 | 韩昊喆 | Foundry facing and preparation method and application |
| CN107088643A (en) * | 2017-05-09 | 2017-08-25 | 孟州市鑫达制动材料有限公司 | Integral type coke-quenching car door steel alloy monoblock cast processing technology |
| CN107695295A (en) * | 2017-10-23 | 2018-02-16 | 安徽金兰压铸有限公司 | A kind of casting processing method of fusible pattern |
| CN107855467A (en) * | 2017-11-22 | 2018-03-30 | 扬州峰明光电新材料有限公司 | The model casting system and investment casting method of U-shaped magnesium alloy member |
| CN108273963A (en) * | 2018-01-23 | 2018-07-13 | 共享装备股份有限公司 | A kind of casting method for preventing from generating shrinkage defect at the thick big wall of casting |
| EA201700557A1 (en) * | 2017-10-23 | 2019-04-30 | Карагандинский Государственный Технический Университет | MANUFACTURE OF SANDY-RESIN FORMS |
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2021
- 2021-05-21 CN CN202110558289.9A patent/CN113333673A/en active Pending
Patent Citations (8)
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| JPH06166255A (en) * | 1992-11-30 | 1994-06-14 | Fukutoku Sangyo Kk | Formation of indented character, mark, etc., on surface of metal plate |
| CN106238670A (en) * | 2016-09-19 | 2016-12-21 | 韩昊喆 | Foundry facing and preparation method and application |
| CN107088643A (en) * | 2017-05-09 | 2017-08-25 | 孟州市鑫达制动材料有限公司 | Integral type coke-quenching car door steel alloy monoblock cast processing technology |
| CN107695295A (en) * | 2017-10-23 | 2018-02-16 | 安徽金兰压铸有限公司 | A kind of casting processing method of fusible pattern |
| EA201700557A1 (en) * | 2017-10-23 | 2019-04-30 | Карагандинский Государственный Технический Университет | MANUFACTURE OF SANDY-RESIN FORMS |
| CN107855467A (en) * | 2017-11-22 | 2018-03-30 | 扬州峰明光电新材料有限公司 | The model casting system and investment casting method of U-shaped magnesium alloy member |
| CN108273963A (en) * | 2018-01-23 | 2018-07-13 | 共享装备股份有限公司 | A kind of casting method for preventing from generating shrinkage defect at the thick big wall of casting |
| CN110238347A (en) * | 2019-06-24 | 2019-09-17 | 天津忠旺铝业有限公司 | A kind of lost foam casting camshaft running gate system |
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Application publication date: 20210903 |