CN111001788B - Differential low-pressure pouring method for reinforcing by resin sand after core assembly - Google Patents
Differential low-pressure pouring method for reinforcing by resin sand after core assembly Download PDFInfo
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- CN111001788B CN111001788B CN201911359060.1A CN201911359060A CN111001788B CN 111001788 B CN111001788 B CN 111001788B CN 201911359060 A CN201911359060 A CN 201911359060A CN 111001788 B CN111001788 B CN 111001788B
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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
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
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Abstract
The invention relates to a differential low-pressure pouring method for reinforcing a core assembly by using resin sand, and belongs to the technical field of mechanical product equipment casting. Firstly, filling resin sand in the other parts except the metal pipe in the metal bottom sand box, scraping the upper end surface of the resin sand, and forming a bottom reinforced resin sand structure after the resin sand is hardened; assembling cores on the upper end surfaces of the bottom reinforced resin sand, sleeving a plurality of annular metal middle sand boxes around the assembled cores after the core assembly is finished, and filling resin sand in gaps between the metal middle sand boxes and the assembled cores to form a middle reinforced resin sand structure; covering the metal sand box with a metal cover on the upper end face of the metal sand box, continuously filling resin sand from the upper end face of the metal sand box, scraping, and forming an upper reinforced resin sand structure after the resin sand is solidified and hardened; the outer side surfaces of the metal bottom sand box and the metal cover sand box are connected with circular rings, the locking pull rod penetrates through the circular rings and is matched with the locking pull rod through nuts to be locked, and then differential and low-pressure pouring is carried out.
Description
Technical Field
The invention belongs to the technical field of mechanical product equipment casting, and particularly relates to a differential low-pressure pouring method for reinforcing by resin sand after core assembly.
Background
The traditional core making technology adopts a metal mold to make a sand mold (core), the structures such as mold draft, parting surface, exhaust and the like need to be designed, if the structure of a product needs to be modified, the mold needs to be modified at first, and then trial production is carried out. The whole period is long, the adaptability of the die is poor, and the requirements on the size precision and the appearance of large thin-wall parts with complex structures are difficult to guarantee particularly when the large thin-wall parts are cast.
For large aluminum alloy thin-wall castings, in order to achieve light weight, the castings are not designed with draft angles. The production is carried out according to the traditional process, and the proper special sandbox, external mold, core box and pouring channel are designed and produced; then molding by resin sand, making a core, taking a mold, repairing the mold, brushing coating, polishing and baking; then closing the box, setting the core, buckling the box, smearing the box, locking and pouring. The production cycle is long, the manufacturing difficulty is high, the labor and time are wasted, the efficiency is low, the cost is high, and the delivery can not be completed according to the quality on time.
In order to reduce the production cost and improve the core making efficiency, the structure of the resin sand core needs to be changed, the complex sand core is decomposed into a plurality of simple sand cores, so that the sand core box is simple to manufacture and high in size precision, and then the core is assembled for pouring. The method opposite to the traditional pouring process can ensure that the resin sand core is simple in design and manufacture, the contact surface of the casting is convenient to brush and brush, the polishing is easy, the surface is smooth, and the poured aluminum alloy casting has the advantages of high dimensional precision, clear external outline, good appearance quality, compact structure, high comprehensive quality of the casting, shortened production period and greatly reduced cost. However, after the rapid core assembly of the baked sand core is completed, all the resin sand cores need to be fixed, and the resin sand cores can bear pressure casting under poor pressure and low pressure without expanding, so that the method becomes a great problem: the binding is tight, the sand can fall off when the binding is tight, and poor and low-pressure pouring can not be carried out. Therefore, how to overcome the defects of the prior art is a problem which needs to be solved in the technical field of casting of the mechanical product equipment at present.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a differential low-pressure casting method for reinforcing a core by using resin sand after core assembly.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a differential low-pressure casting method for reinforcing with resin sand after core assembly comprises the following steps:
the middle of the metal bottom sand box is fixedly connected with a metal pipe, and the metal pipe is axially vertical to the horizontal plane;
filling resin sand in the metal bottom sand box except the metal pipe, scraping the upper end surface of the resin sand, and forming a bottom reinforced resin sand structure after the resin sand is solidified and hardened;
then assembling cores on the upper surface of the bottom reinforced resin sand structure, sleeving a plurality of annular metal middle sand boxes around the cores after the cores are assembled, and filling resin sand in gaps between the metal middle sand boxes and the cores to form a middle reinforced resin sand structure;
covering the metal cover sand box on the upper end of the metal middle sand box, then continuously filling resin sand between the middle reinforced resin sand structure and the metal cover sand box, scraping the upper surface of the middle reinforced resin sand structure, and forming an upper reinforced resin sand structure after the resin sand is solidified and hardened; therefore, the upper reinforcing resin sand structure, the middle reinforcing resin sand structure and the bottom reinforcing resin sand structure wrap and fasten the core assembly to be fixed into a whole;
the outer side surfaces of the metal bottom sand box and the metal cover sand box are connected with a plurality of circular rings, the circular rings are symmetrically arranged, the locking pull rod penetrates through the upper circular ring and the lower circular ring which correspond to each other and is matched with the locking pull rod through a nut for locking, and then differential and low-pressure pouring is carried out.
Further, it is preferable that the raw materials of the resin sand used for the bottom-reinforced resin sand structure and the middle-reinforced resin sand structure include sand, resin and a curing agent; the mass ratio of the sand to the resin to the curing agent is 50: 1: 0.4-0.5;
the raw materials of the resin sand adopted by the upper reinforced resin sand structure comprise sand, resin and a curing agent; the mass ratio of the sand to the resin to the curing agent is 50: 1: 0.8-1.
Further, it is preferable that the number of the metal flasks is 4.
Further, it is preferable that the size of the metal drag flask is the same as the size of the metal cover flask.
The invention considers the characteristics that the resin sand has better fluidity, easy compactness, heat preservation, air permeability, adjustable solidification time, high strength after hardening, high rigidity and almost no deformability, and the resin sand has the advantages of high strength of 0.6-0.9 MPa and no deformation in the subsequent carrying and box closing locking processes.
On the premise of meeting the effective sand eating quantity, the sand eating quantity can be selected between 50-150 mm according to the size and the complexity of a casting, the size of the sand core is reasonably controlled, and a bottom sand box, a middle sand box and a cover sand box can be manufactured by using light sections, so that the production cost is reduced.
When the bottom reinforced resin sand structure and the middle reinforced resin sand structure are constructed, the groove is preferably pressed on the upper surface of the bottom reinforced resin sand structure (the specific position of the groove is not limited), so that the upper reinforced resin sand structure, the middle reinforced resin sand structure and the bottom reinforced resin sand are positioned, and the case staggering caused by uneven stress in the hoisting process is prevented.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a differential low-pressure pouring method for reinforcing with resin sand after core assembly, differential low-pressure pouring is carried out by the method, compared with the traditional core making process technology, the efficiency of the manufacturing production cycle is improved by more than one time, the product forming rate is improved by more than one time, 100% forming can be realized, and the poured casting has high dimensional precision, clear external contour, good appearance quality, compact structure and high comprehensive quality.
Drawings
FIG. 1 is a front view of the differential low pressure casting method of the present invention reinforced with resin sand after core assembly;
FIG. 2 is a left side view of FIG. 1;
FIG. 3 is a top view of FIG. 1;
FIG. 4 is a perspective view of the core assembly;
FIG. 5 is an exploded view of the core assembly;
wherein, 1, a metal bottom sand box; 2. a bottom reinforced resin sand structure; 3. assembling a core; 4. an upper reinforced resin sand structure; 5. a metal drag box; 6. a metal-covered flask; 7. locking the pull rod; 8. a middle reinforced resin sand structure; 9. a gap type auxiliary pouring channel; 10. 1# sand core; 11. 2# sand core; 12. 3# sand core; 13. 4# sand core; 14. 5# sand core; 15. 6# sand core; 16. 7# sand core; 17. 8# sand core; 18. 9# sand core; 19. 10# sand core; 20. 11# sand core; 21. 1#2 sand core; 22. the No. 13 sand core; 23. a # 14 sand core; 24. 15# sand core; 25. a # 16 sand core; 26. and (5) internal chill.
Detailed Description
The present invention will be described in further detail with reference to examples.
It will be appreciated by those skilled in the art that the following examples are illustrative of the invention only and should not be taken as limiting the scope of the invention. The examples do not specify particular techniques or conditions, and are performed according to the techniques or conditions described in the literature in the art or according to the product specifications. The materials or equipment used are not indicated by manufacturers, and all are conventional products available by purchase.
As shown in fig. 1 to 5, a differential low pressure casting method for reinforcing a core by resin sand after core assembly comprises the following steps:
the middle of the metal bottom sand box 1 is fixedly connected with a metal pipe, the metal pipe is axially vertical to a horizontal plane, and the metal pipe is used as a pouring gate of the core assembly;
filling resin sand in the metal bottom sand box 1 except the metal pipe, scraping the upper end surface of the resin sand, and forming a bottom reinforced resin sand structure 2 after the resin sand is solidified and hardened;
then, assembling cores on the upper surface of the bottom reinforced resin sand structure 2, after the cores 3 are assembled, sleeving a plurality of annular metal middle sand boxes 5 around the cores 3, and filling resin sand in the gaps between the metal middle sand boxes 5 and the cores 3 to form a middle reinforced resin sand structure 8;
covering the metal cover sand box 6 on the upper end of the metal middle sand box 5, then continuously filling resin sand between the middle reinforced resin sand structure 8 and the metal cover sand box 6, scraping the upper surface of the resin sand, and forming an upper reinforced resin sand structure 4 after the resin sand is solidified and hardened; therefore, the upper reinforcing resin sand structure 4, the middle reinforcing resin sand structure 8 and the bottom reinforcing resin sand structure 2 wrap and fasten the core assembly 3 to be fixed into a whole;
the outer side surfaces of the metal bottom sand box 1 and the metal cover sand box 6 are connected with a plurality of circular rings, the circular rings are symmetrically arranged, the locking pull rod 7 penetrates through the upper circular ring and the lower circular ring which correspond to each other and is matched with the locking pull rod 7 through a nut for locking, and then differential and low-pressure pouring is carried out.
Preferably, the raw materials of the resin sand adopted by the bottom reinforced resin sand structure 2 and the middle reinforced resin sand structure 8 comprise sand, resin and a curing agent; the mass ratio of the sand to the resin to the curing agent is 50: 1: 0.4-0.5;
the raw materials of the resin sand adopted by the upper reinforced resin sand structure comprise sand, resin and a curing agent; the mass ratio of the sand to the resin to the curing agent is 50: 1: 0.8-1. Compared with the resin sand adopted by the bottom reinforced resin sand structure 2 and the middle reinforced resin sand structure 8, the consumption of the curing agent in the raw materials of the resin sand adopted by the upper reinforced resin sand structure 4 is doubled, so that the curing speed is increased, and the curing speed is changed from 45-60min to 10-20 min.
Preferably, there are 4 of said metal middleboxes 5.
Preferably, the dimensions of the metal drag flask 1 are the same as the dimensions of the metal cover flask 6.
The manufacturing method of the metal bottom sand box 1 comprises the following steps: firstly, channel steel is adopted to manufacture a square frame, then reinforcing ribs are welded in the square frame, preferably, the reinforcing ribs are welded into a grid shape, and a metal pipe is welded in the middle to be used as a pouring gate. When the resin sand is filled, the resin sand is filled in the grid.
The manufacturing method of the metal cover sand box 6 comprises the following steps: firstly, channel steel is adopted to manufacture a square frame, and then reinforcing ribs are welded in the square frame, preferably, the reinforcing ribs are welded into a grid shape. When the resin sand is filled, the resin sand is filled in the grid.
In the production of the resin sand, it is preferable to produce the resin sand by a continuous sand mixer.
As shown in figure 5, the core assembly 3 is composed of a sand core which is formed by embedding internal chill and a gap type auxiliary pouring gate in 1# to 16# small sand cores, coating, polishing and drying.
The strength of the core assembly 3 is increased by three to five times under the tight wrapping of the metal bottom sand box 1, the metal cover sand box 6, the metal middle sand box 5, the upper reinforced resin sand structure 4, the middle reinforced resin sand structure 8 and the bottom reinforced resin sand structure 2, and the pull rods on the periphery of the metal bottom sand box 1 and the metal cover sand box 6 are locked, so that the core assembly can bear two to three times of the twenty to thirty tons of box lifting force generated by differential and low-pressure crystallization pressurization of a parting surface, and can be increased by one time (0.12 to 0.3 MPa) when differential and low-pressure (0.06 to 0.15 MPa) casting is carried out, so that the formation of air holes in the casting process is reduced, and a high-quality large thin-wall aluminum alloy casting is obtained.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. A differential low-pressure casting method for reinforcing with resin sand after core assembly is characterized by comprising the following steps:
the middle of the metal bottom sand box is fixedly connected with a metal pipe, and the metal pipe is axially vertical to the horizontal plane;
filling resin sand in the metal bottom sand box except the metal pipe, scraping the upper end surface of the resin sand, and forming a bottom reinforced resin sand structure after the resin sand is solidified and hardened;
then assembling cores on the upper surface of the bottom reinforced resin sand structure, sleeving a plurality of annular metal middle sand boxes around the cores after the cores are assembled, and filling resin sand in gaps between the metal middle sand boxes and the cores to form a middle reinforced resin sand structure;
covering the metal cover sand box on the upper end of the metal middle sand box, then continuously filling resin sand between the middle reinforced resin sand structure and the metal cover sand box, scraping the upper surface of the middle reinforced resin sand structure, and forming an upper reinforced resin sand structure after the resin sand is solidified and hardened; therefore, the upper reinforcing resin sand structure, the middle reinforcing resin sand structure and the bottom reinforcing resin sand structure wrap and fasten the core assembly to be fixed into a whole;
the outer side surfaces of the metal bottom sand box and the metal cover sand box are connected with a plurality of circular rings which are symmetrically arranged, the locking pull rod penetrates through an upper circular ring and a lower circular ring and is matched with the locking pull rod through a nut for locking, and then differential and low-pressure pouring is carried out;
the raw materials of the resin sand adopted by the bottom reinforced resin sand structure and the middle reinforced resin sand structure comprise sand, resin and a curing agent; the mass ratio of the sand to the resin to the curing agent is 50: 1: 0.4-0.5;
the raw materials of the resin sand adopted by the upper reinforced resin sand structure comprise sand, resin and a curing agent; the mass ratio of the sand to the resin to the curing agent is 50: 1: 0.8-1;
when the bottom reinforced resin sand structure and the middle reinforced resin sand structure are constructed, grooves are pressed on the upper surface of the bottom reinforced resin sand structure.
2. The method of differential low pressure casting reinforced with resin sand after core assembly of claim 1, wherein there are 4 of said metal drag boxes.
3. The method of differential low pressure casting reinforced with resin sand after core assembly according to claim 1, wherein the size of the metal drag flask is the same as that of the metal cover flask.
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| CN201911359060.1A CN111001788B (en) | 2019-12-25 | 2019-12-25 | Differential low-pressure pouring method for reinforcing by resin sand after core assembly |
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| CN111001788B true CN111001788B (en) | 2021-09-14 |
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| CN111515377B (en) * | 2020-05-29 | 2022-05-03 | 中国航发南方工业有限公司 | Complex thin-wall aluminum-magnesium alloy casting and casting method thereof |
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| US3656539A (en) * | 1969-01-29 | 1972-04-18 | Amsted Ind Inc | Apparatus for casting molten metal |
| JPH02127957A (en) * | 1988-11-08 | 1990-05-16 | Nissan Motor Co Ltd | Method for casting cylinder head |
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| CN104308081A (en) * | 2014-10-21 | 2015-01-28 | 沈阳铸造研究所 | Method for V-method shaping anti-gravity pouring of aluminum alloy casting |
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| CN109518073A (en) * | 2018-11-26 | 2019-03-26 | 中信重工机械股份有限公司 | A kind of zigzag spheroidal graphite cast-iron platform and its casting method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102343418B (en) * | 2011-08-29 | 2013-07-10 | 西安西工大超晶科技发展有限责任公司 | Casting method of three-dimensional flow aluminum alloy impeller casting |
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- 2019-12-25 CN CN201911359060.1A patent/CN111001788B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3656539A (en) * | 1969-01-29 | 1972-04-18 | Amsted Ind Inc | Apparatus for casting molten metal |
| JPH02127957A (en) * | 1988-11-08 | 1990-05-16 | Nissan Motor Co Ltd | Method for casting cylinder head |
| CN103008612A (en) * | 2012-11-15 | 2013-04-03 | 北京航星机器制造公司 | Multi-element combined-type low-pressure pouring method and combined-type sand core |
| CN104308081A (en) * | 2014-10-21 | 2015-01-28 | 沈阳铸造研究所 | Method for V-method shaping anti-gravity pouring of aluminum alloy casting |
| CN105834363A (en) * | 2016-06-03 | 2016-08-10 | 扬州峰明金属制品有限公司 | Precise low-pressure lost wax casting system |
| CN109518073A (en) * | 2018-11-26 | 2019-03-26 | 中信重工机械股份有限公司 | A kind of zigzag spheroidal graphite cast-iron platform and its casting method |
| CN109249004A (en) * | 2018-11-30 | 2019-01-22 | 北京航星机器制造有限公司 | A kind of low pressure casting snap flask |
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