CN116652120A - Casting method of heavy-duty robot ductile iron casting - Google Patents
Casting method of heavy-duty robot ductile iron casting Download PDFInfo
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- CN116652120A CN116652120A CN202310685331.2A CN202310685331A CN116652120A CN 116652120 A CN116652120 A CN 116652120A CN 202310685331 A CN202310685331 A CN 202310685331A CN 116652120 A CN116652120 A CN 116652120A
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- casting
- sand
- heavy
- casting method
- flange
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- 238000005266 casting Methods 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 31
- 229910001141 Ductile iron Inorganic materials 0.000 title claims abstract description 17
- 239000004576 sand Substances 0.000 claims abstract description 52
- 238000001816 cooling Methods 0.000 claims abstract description 14
- 238000000465 moulding Methods 0.000 claims abstract description 11
- 239000003973 paint Substances 0.000 claims abstract description 7
- 230000001680 brushing effect Effects 0.000 claims abstract description 5
- 235000000396 iron Nutrition 0.000 claims abstract description 3
- 238000003754 machining Methods 0.000 claims abstract description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 67
- 239000000377 silicon dioxide Substances 0.000 claims description 8
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000011248 coating agent Substances 0.000 abstract description 4
- 238000000576 coating method Methods 0.000 abstract description 4
- 238000007528 sand casting Methods 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 16
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 9
- 239000011593 sulfur Substances 0.000 description 9
- 229910052717 sulfur Inorganic materials 0.000 description 9
- 229910052742 iron Inorganic materials 0.000 description 8
- 238000012545 processing Methods 0.000 description 8
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 6
- 239000011777 magnesium Substances 0.000 description 6
- 229910052749 magnesium Inorganic materials 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000010410 layer Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- SRSXLGNVWSONIS-UHFFFAOYSA-N benzenesulfonic acid Chemical group OS(=O)(=O)C1=CC=CC=C1 SRSXLGNVWSONIS-UHFFFAOYSA-N 0.000 description 1
- 229940092714 benzenesulfonic acid Drugs 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000007849 furan resin Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010587 phase diagram Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C23/00—Tools; Devices not mentioned before for moulding
- B22C23/02—Devices for coating moulds or cores
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The application discloses a casting method of a heavy-duty robot ductile iron casting, and belongs to the field of sand casting. A casting method of a heavy-duty robot ductile iron casting comprises the following steps: s1, placing a circle of cooling cores at the bottom of a large casting flange of a die, and placing follow-up cooling irons at end face machining positions of small flanges and on the large casting flange; s2, placing used sand into the die of the S1, and pouring the die to obtain a cavity; and S3, brushing sulfur-seepage-proofing paint on the part of the cavity, and closing and pouring to obtain the heavy-duty robot ductile iron casting. The method can solve the problem of batch scrapping of castings caused by partial disqualification of castings due to uneven thickness of the sulfur-proof coating; the problems of cost waste and instability caused by batch use of new sand in order to reduce the ignition quantity in the molding process can be solved; so as to ensure that the casting production of the heavy-duty robot of a certain model in the family of Faonaceae is finished with low cost, high efficiency and high quality.
Description
Technical Field
The application relates to a casting method of a heavy-duty robot ductile iron casting, and belongs to the field of sand casting.
Background
In the process of producing ductile iron castings by using furan resin sand, as the main component of the curing agent is benzenesulfonic acid, most foundry works take the problem of casting cost into consideration, silica sand can be recycled by adopting a sand rubbing regeneration mode, but the common mechanical regeneration method cannot effectively solve the residual curing agent on the surface of the silica sand, which leads to exceeding standard of sulfur elements on the surface of the silica sand in the long time, leads to spheroidization degradation of castings after molding casting, influences the mechanical properties of the castings, and seriously leads to batch scrapping, and the problems are solved by adding new sand proportion during molding of resin sand and reducing the ignition loss.
Disclosure of Invention
Because of the limitation of the product structure and considering the molding production efficiency, the process design of a heavy-duty robot of the family Fanac is 1-type and 2-piece, the process structure design is complex, and because the layout of the design runner is close to the casting, the whole heat force field of the casting is affected, and serious spheroidization degradation is caused to the part of the casting. The method comprises the following steps: (1) the casting process layout is 1-type 2 pieces, the process layout is compact, the heat is concentrated, the die is large, and if the whole appearance is made of new sand, the casting cost is high; (2) the thickness of the casting flange is 40mm, the wall thickness around the flange is 12mm, the local change trend of the casting is obvious, and the rapid cooling of the thick and large part of the casting is not facilitated; (3) the casting cavity has large area, and if the whole cavity is coated with the sulfur-proof paint, the production efficiency is affected, and the casting cavity is coated by hand, and the consistency is poor.
The application provides a casting method of a heavy-duty robot ductile iron casting, which solves the problems by adopting the principle of reducing the chemical reaction between magnesium element and sulfur element, and accelerates the overflow of sulfur gas and reduces the sulfur element content in casting mould by changing the mould structure; meanwhile, the chill is locally used, so that the solidification of molten iron is accelerated, and the reaction time of magnesium element and sulfur element is reduced; forming an anti-seepage interlayer by using the anti-seepage paint; and the sulfur element in the used sand is isolated by the core sand locally. The problem of spheroidization decline of a heavy-duty robot of the family Faanaceae is solved by adopting the four points above in consideration of the cost and efficiency.
According to the method, a cold core (new sand) with a fixed shape is produced firstly, the cold core is placed at a designated position in advance in the molding process of a cavity, then old sand is placed according to a conventional molding process, the old sand and the cavity form an isolation barrier through a cold core sand block, the reaction of sulfur element and magnesium element is reduced, and meanwhile, the whole brushing of sulfur-proof paint is changed into local brushing, so that the casting production efficiency is improved.
A casting method of a heavy-duty robot ductile iron casting comprises the following steps:
s1, placing a circle of cooling cores at the bottom of a large casting flange of a die, and placing follow-up cooling irons at end face machining positions of small flanges and on the large casting flange;
s2, placing used sand into the mold of the S1 according to a conventional molding process, and performing mold reversing to obtain a cavity;
and S3, brushing sulfur-seepage-proofing paint on the part of the cavity, and closing and pouring to obtain the heavy-duty robot ductile iron casting.
As a specific embodiment of the application, the large flange and the small flange of the casting are defect surfaces which are easy to generate in the casting, and are particularly shown in figures 8-10.
As a specific embodiment of the present application, in step S1, the cooling core is made of new sand.
As a specific embodiment of the application, in the step S1, the thickness of the cooling core is 45-55mm.
Alternatively, the thickness of the chill is independently selected from any value or range of values between any two of 45mm, 46mm, 47mm, 48mm, 49mm, 50mm, 51mm, 52mm, 53mm, 54mm, 55mm.
As a specific embodiment of the application, in the step S1, the diameter of the cooling core is 380-400mm. The diameter of the cooling core refers to the outer diameter.
Alternatively, the diameter of the chill is independently selected from any value or range of values between any two of 380mm, 382mm, 384mm, 386mm, 388mm, 390mm, 392mm, 394mm, 396mm, 398mm, 400mm.
As a specific embodiment of the application, in the step S1, the thickness of the follow-up chill is 20-21mm.
In step S1, the thickness of the flange is 34-45mm;
the peripheral wall thickness of the flange is 10-15mm.
The flange refers to a generic term for flanges other than the casting large and small flanges.
Alternatively, the thickness of the flange is independently selected from any value or range between any two of 34mm, 35mm, 36mm, 37mm, 38mm, 39mm, 40mm, 41mm, 42mm, 43mm, 44mm, 45 mm.
Optionally, the peripheral wall thickness of the flange is independently selected from any of 10mm, 11mm, 12mm, 13mm, 14mm, 15mm or a range between any two.
As a specific embodiment of the application, step S2 includes adding new sand into the old sand, then placing the old sand added with the new sand into the mold of S1, and performing reverse molding to obtain a cavity;
the new sand accounts for more than 50% of the total silica sand;
the total silica sand refers to the sum of the new sand and the old sand.
Alternatively, the ratio of the green sand is independently selected from any value of 50%, 60%, 70%, 80%, 90%, 100% or a range between any two.
In step S3, the upper die and the lower die which form the cavity are combined together, molten iron is poured, and the heavy-duty robot ductile iron casting is obtained through cleaning and processing stages.
In step S3, a vent groove is provided in the upper die at a position on the following chill surface.
The application has the beneficial effects that:
the casting method of the heavy-duty robot ductile iron casting provided by the application can solve the problem that batch scrapping of castings is caused by partial disqualification of castings due to uneven thickness of the sulfur-proof coating; the problems of cost waste and instability caused by batch use of new sand in order to reduce the ignition quantity in the molding process can be solved; so as to ensure that the casting production of the heavy-duty robot of a certain model in the family of Faonaceae is finished with low cost, high efficiency and high quality.
Drawings
Fig. 1 is an enlarged view of a portion of a prior art mold.
Fig. 2 is a top view of the mold.
FIG. 3 is a schematic diagram of a cooling insert according to the present disclosure.
Fig. 4 is a working mold disclosed in the present application.
FIG. 5 shows a partial surface coating of a cavity with sulfur-proof coating according to the present disclosure.
Fig. 6 is a diagram of a heavy duty robotic ductile iron casting made by the casting method of the present disclosure.
Fig. 7 is a golden phase diagram of a heavy duty robotic ductile iron casting of the present disclosure.
FIG. 8 is a diagram of the relative positions of the large casting flange in the mold according to the present disclosure.
Fig. 9 is a diagram of the relative positions of the small flanges of the present disclosure in a mold.
FIG. 10 is a diagram of the placement of the large and small flanges of the castings of the present disclosure in a mold.
List of parts and reference numerals:
1. casting large flanges; 2. a cooling core; 3. random chill; 4. and a small flange.
Detailed Description
The present application is described in detail below with reference to examples, but the present application is not limited to these examples.
Unless otherwise indicated, all starting materials in the examples of the present application were purchased commercially.
Unless otherwise indicated, conventional testing methods or instrumental recommended testing methods are employed.
The analysis method in the embodiment of the application is as follows:
metallographic analysis was performed using vertA 1.
Example 1
1. The sand core is produced by adopting a cold core process, and a plurality of quarter circles (shown in figure 4) with the thickness of 50mm and the diameter of 390mm are placed at the bottom of the large flange of the casting so as to form a circle at the bottom of the large flange of the casting.
The solidification of the thick and large part is quickened by adopting a local chill adding mode, and a piece of follow-up chill with the thickness of 20-21mm is added on the defect surface which is extremely easy to generate of the casting, namely, on the processing position of the end face of the small flange;
and adding a plurality of follow-up chill with the thickness of 20-21mm at the large flange of the casting, and enclosing into a circle.
2. And placing the used sand into a mold with a circle of follow-up chill and a circle of chill cores according to a conventional molding process, and demolding after the used sand is solidified to obtain the cavity. Thereby providing an insulating barrier between the used sand and the cavity by the chill sand block (as shown in fig. 5). The mold cavity is locally cooled by adopting a cooling core (new sand), so that the large-area use of the new sand is avoided, and the production cost is reduced.
3. The cavity shown in fig. 5 is taken as a lower die and is combined with an upper die (as shown in fig. 2), and an exhaust groove is reserved at the upper die corresponding to the following type chill (so that sulfur gas overflows conveniently, meanwhile, the discharge of the cold molten iron at two sides of the lower flange surface (the dirty melting and converging of the molten iron is increased), and the loss of magnesium elements for molten iron is reduced). And pouring, cleaning and processing to obtain the heavy-duty robot ductile iron casting.
The thickness of the whole wall of the casting is 12mm, only the thickness of the processing position is thicker, and according to the solidification sequence principle, the magnesium element in the molten iron is not solidified as soon as the reaction is completed, so that the problem can not be caused, and therefore, only the thick and large part is brushed with the sulfur-proof paint (shown in figure 5), so that a separation layer is formed between the casting and the used sand, the corrosion of the sulfur element in the used sand into the molten iron is prevented, and the magnesium element in the molten iron is reserved.
Comparative example
The experimental procedure is the same as in example 1, except that the proportion of old sand to new sand is changed when silica sand is added in step "2", and specific parameters are shown in table 1.
The experimental procedure is the same as in example 1, except that no chill and/or random is added in step "1", see table 2 for specific parameters.
Analytical example
The casting processing position is not required to be provided with a flaky graphite layer (5 mm), 1 casting is generally required to be returned in whole batches, the requirement is strict, and the casting processing position is not provided with the flaky graphite layer only by increasing the proportion of new sand to 50%, and the concrete results are as follows:
TABLE 1
TABLE 2
As shown in fig. 7, the cast is metallographic observed after being unpeened, and no problem is found;
as shown in FIG. 6, the cast processing position is processed without a graphite flake layer, and all the processing is qualified after being sent to a client.
While the application has been described in terms of preferred embodiments, it will be understood by those skilled in the art that various changes and modifications can be made without departing from the scope of the application, and it is intended that the application is not limited to the specific embodiments disclosed.
Claims (8)
1. The casting method of the heavy-duty robot ductile iron casting is characterized by comprising the following steps of:
s1, placing a circle of cooling cores at the bottom of a large casting flange of a die, and placing follow-up cooling irons at end face machining positions of small flanges and on the large casting flange;
s2, placing used sand into the die of the S1, and pouring the die to obtain a cavity;
and S3, brushing sulfur-seepage-proofing paint on the part of the cavity, and closing and pouring to obtain the heavy-duty robot ductile iron casting.
2. Casting method according to claim 1, characterized in that in step S1 the chill core is made of virgin sand.
3. Casting method according to claim 1 or 2, characterized in that in step S1 the thickness of the chill is 45-55mm.
4. A casting method according to any one of claims 1 to 3, wherein in step S1, the diameter of the chill is 380 to 400mm.
5. A casting method according to any one of claims 1 to 3, wherein in step S1, the thickness of the shape-following chill is 20 to 21mm.
6. A casting method according to any one of claims 1 to 3, wherein in step S1, the flange has a thickness of 34 to 45mm;
and/or the peripheral wall thickness of the flange is 10-15mm.
7. A casting method according to any one of claims 1 to 3, characterized in that step S2 comprises adding new sand to the old sand, then placing the old sand with the new sand added to the mold of S1, and obtaining a cavity after reverse molding;
the new sand accounts for more than 50% of the total silica sand;
YH2361115CN
the total silica sand refers to the sum of the new sand and the old sand.
8. A casting method according to any one of claims 1 to 3, wherein in step S3, a vent groove is provided in the upper die at a position on the following chill face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310685331.2A CN116652120A (en) | 2023-06-09 | 2023-06-09 | Casting method of heavy-duty robot ductile iron casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310685331.2A CN116652120A (en) | 2023-06-09 | 2023-06-09 | Casting method of heavy-duty robot ductile iron casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116652120A true CN116652120A (en) | 2023-08-29 |
Family
ID=87715013
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310685331.2A Pending CN116652120A (en) | 2023-06-09 | 2023-06-09 | Casting method of heavy-duty robot ductile iron casting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116652120A (en) |
-
2023
- 2023-06-09 CN CN202310685331.2A patent/CN116652120A/en active Pending
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