CN109128032B - High-nickel austenitic ductile iron engine exhaust pipe back fire feeding process - Google Patents
High-nickel austenitic ductile iron engine exhaust pipe back fire feeding process Download PDFInfo
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- CN109128032B CN109128032B CN201811313623.9A CN201811313623A CN109128032B CN 109128032 B CN109128032 B CN 109128032B CN 201811313623 A CN201811313623 A CN 201811313623A CN 109128032 B CN109128032 B CN 109128032B
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- casting
- fire
- exhaust pipe
- pouring
- riser
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- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000008569 process Effects 0.000 title claims abstract description 19
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 18
- 229910001141 Ductile iron Inorganic materials 0.000 title claims abstract description 17
- 238000005266 casting Methods 0.000 claims abstract description 67
- 239000002893 slag Substances 0.000 claims abstract description 18
- 239000004576 sand Substances 0.000 claims abstract description 5
- 238000009825 accumulation Methods 0.000 claims abstract description 4
- 229910001566 austenite Inorganic materials 0.000 claims description 2
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 abstract description 30
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 28
- 238000004519 manufacturing process Methods 0.000 abstract description 23
- 229910052742 iron Inorganic materials 0.000 abstract description 14
- 238000009413 insulation Methods 0.000 abstract description 5
- 230000007547 defect Effects 0.000 abstract description 4
- 239000002002 slurry Substances 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 238000007528 sand casting Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/082—Sprues, pouring cups
-
- 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
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/088—Feeder heads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/20—Stack moulds, i.e. arrangement of multiple moulds or flasks
-
- 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
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Exhaust Silencers (AREA)
Abstract
The utility model discloses a high-nickel austenitic ductile iron engine exhaust pipe back fire feeding process, which belongs to the technical field of automobile part production and comprises a casting process and a casting mould, wherein the casting mould comprises a sand mould, a sand core and a pouring system, and the pouring system comprises a straight pouring channel, a cross pouring channel arranged at the lower part of the straight pouring channel and inner pouring channels arranged at two sides of the cross pouring channel; the tail end of the ingate is connected with a fire inlet provided with a slag accumulating bag, and the middle part of the air inlet flange surface of the exhaust pipe body is provided with a heat insulation riser. According to the utility model, fire is fed from the back of the casting, and casting cavity gas is discharged from the riser of the air inlet flange, so that the molten iron is not wrapped by an isolated gas bag in the casting process; the slag accumulation bag is designed at the front end of the casting fire inlet, so that on one hand, the impact force of molten iron on a cavity is slowed down, the molten iron stably enters the cavity, and other casting defects such as slurry inclusion and the like are avoided; solves the problems of skinning, air holes and shrinkage porosity of castings, and is also suitable for production and casting of triethylamine cold cores.
Description
Technical Field
The utility model relates to the technical field of automobile part production, in particular to a high-nickel austenitic ductile iron engine exhaust pipe back fire inlet process.
Background
The high nickel austenite spheroidal graphite cast iron engine exhaust pipe has wide application in middle and high grade car engines. Sand casting is a basic process for mass production of high nickel ductile iron castings. The triethylamine method cold core box core making has the advantages of high efficiency, energy saving, good casting surface quality, high dimensional accuracy, good sand core collapsibility and the like, and is suitable for mass production of sand casting.
The high nickel ductile iron has the technical characteristics of poor fluidity of molten steel, large solidification shrinkage, high casting temperature and the like. The shrinkage porosity of the casting is large, and the surface is easy to be mixed and skinned. Meanwhile, the exhaust pipe has a complex structure, irregular shape, high runner precision, thinner wall thickness and great casting process difficulty.
In practical casting production application, due to the large ventilation rate of precoated sand, unreasonable design of a pouring system and other reasons, peeling problems sometimes occur, the proportion of casting pores and shrinkage porosity defects is large, and the production of products is restricted. Especially when the triethylamine cold core is used in mass production, the skinning and the choking are serious, and the rejection rate of castings is extremely high. In order to improve the yield of castings and the production efficiency, an ideal solution is required to be sought from the pouring system.
The patent document with publication number CN201410432490.2 discloses a pouring process of an exhaust pipe of a light vehicle, which is characterized by comprising the following technical processes: the position of the pouring gate is moved to the pipe orifice part in the middle of the exhaust pipe from the side, so that molten iron is injected into the cavity from the two pipe orifices, and gas in the cavity is respectively discharged from the two pouring channels under the pushing of rising molten iron, and meanwhile, the gap of the core head is timely adjusted. However, in the casting process, the gas in the cavity is discharged from the casting channel, the phenomena of skinning and choking of the casting are serious, the defects of air holes, shrinkage porosity and the like are more, and the qualification rate of the finished product is low.
The patent with the publication number of CN205904387U discloses a high nickel ductile iron exhaust pipe pouring system, which comprises a sprue, transverse runners arranged at two sides of the lower part of the sprue and inner runners arranged at two sides of the transverse runner; the tail end of the ingate is connected with a feeding riser, the feeding riser is connected with air inlet flange surfaces on two sides of the exhaust pipe body through a short-circuit ingate, the middle part of the air inlet flange surface of the exhaust pipe body is provided with a heat insulation riser, and an air outlet flange of the exhaust pipe body is provided with a heat insulation riser; when the utility model is adopted to pour the exhaust pipe of the type, the process yield is improved to 42% from the original 33%; meanwhile, the use of a ceramic slag-avoiding net is eliminated, and the phenomenon of shrinkage porosity and air leakage at the root of the air outlet flange is solved; the product percent of pass is improved to 94% from the original 69%; meanwhile, the sealing performance and the toughness of the exhaust pipe can be greatly improved, the service life of the exhaust pipe is prolonged, and the maintenance cost is saved. However, the system adopts front fire, although the yield of the product is improved, the peeling defect phenomenon is serious and accounts for 15-30%, the casting defective rate is extremely high, a great amount of repair time and cost are required to be input, and the product quality is affected.
Disclosure of Invention
In view of the above, the utility model provides a high-nickel austenitic ductile iron engine exhaust pipe back fire feeding process, which solves the problem of skinning air holes of castings and is also suitable for production and casting of triethylamine cold cores.
In order to solve the technical problems, the utility model adopts the following technical scheme:
the back fire feeding process of the high-nickel austenitic ductile iron engine exhaust pipe comprises a casting process and a casting mold, wherein the casting mold comprises a sand mold, a sand core and a pouring system, and the pouring system comprises a sprue, a runner arranged at the lower part of the sprue and inner runners arranged at two sides of the runner; the tail end of the ingate is connected with a fire inlet provided with a slag accumulating bag, and the middle part of the air inlet flange surface of the exhaust pipe body is provided with a heat insulation riser.
Further, the fire inlet is arranged at the back of the exhaust pipe body and/or the air outlet flange surface.
Furthermore, the height of the slag accumulating bag is 15-45 mm higher than that of the fire inlet, and the slag accumulating bag is a square riser or a round riser.
Further, the exhaust pipe is a four-cylinder or six-cylinder exhaust pipe.
Further, the pouring system is a plurality of pieces.
Furthermore, the casting process adopts back fire feeding, and cavity gas is sequentially discharged to a heat-insulating riser in the middle of the air inlet flange surface.
The beneficial effects of the utility model are as follows:
in the prior art, the molding line is produced by one mold with two parts, and the riser on the surface of the air inlet flange is heated in front. According to the production process, the air hole proportion of the casting is up to 30% in cold core test production of triethylamine, so that the actual production always uses a hot core box for core making, and even if the hot core is used, the peeling air hole proportion of the casting can be up to 20% in the humid air environment in summer. Then, the casting process is simulated and analyzed, the skinning position is found to be a molten iron intersection position, and the molten iron intersection wraps the cavity gas, so that an isolated gas pocket is formed. The problem of the skinning of the casting produced before is serious, and if the problem of the skinning of the cold core of the casting is to be completely solved, the phenomenon that molten iron meets at the pipe wall position and an isolated air pocket appears is needed to be avoided.
On the basis, the mould and the process are redesigned, a slag accumulating bag is designed at the fire inlet of the casting, the slag accumulating bag can have various forms, can be a square riser or a round riser, and the height of a single slag accumulating bag is 15-45 mm higher than that of the fire inlet. And the cavity gas is sequentially discharged to the riser of the air inlet flange, and an isolated air bag is not formed at the pipe wall position.
According to the utility model, fire is fed from the back of the casting, and casting cavity gas is discharged from the riser of the air inlet flange, so that the molten iron is ensured not to wrap an isolated gas bag in the casting process. The slag accumulation bag is designed at the front end of the casting fire inlet, so that on one hand, the impact force of molten iron on a cavity is slowed down, the molten iron stably enters the cavity, and other casting problems such as slurry inclusion and the like are avoided.
The utility model completely changes the original design mode of the pouring system, so that the triethylamine cold core process can be practically applied to actual production, one die is adopted for multiple pieces, the production efficiency is improved, the production cost is saved, the casting basically has no skinning phenomenon, and the qualification rate is more than 96.5 percent.
Drawings
The present utility model will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural view of a casting system of a casting mold according to a first embodiment of the present utility model.
Fig. 2 is a schematic structural view of a casting system of a casting mold according to a second embodiment of the present utility model.
Fig. 3 is a schematic structural view of a casting system of a casting mold according to a third embodiment of the present utility model.
Fig. 4 is a schematic structural view of a casting system of a casting mold of a comparative example of the present utility model.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to fig. 1 to 4 of the embodiments of the present utility model. It will be apparent that the described embodiments are some, but not all, embodiments of the utility model. All other embodiments, which are obtained by a person skilled in the art based on the described embodiments of the utility model, fall within the scope of protection of the utility model.
Example 1
As shown in fig. 1, the embodiment provides a back fire feeding process of an exhaust pipe of a high-nickel austenitic ductile iron engine, which comprises a casting process and a casting mold, wherein the casting mold comprises a sand mold, a sand core and a pouring system, and the pouring system comprises a sprue 1, a runner 2 arranged at the lower part of the sprue 1 and inner runners 4 arranged at two sides of the runner 2; the tail end of the ingate 4 is connected with a fire inlet provided with a slag ladle 3, and the middle part of an air inlet flange surface 6 of the exhaust pipe body 9 is provided with a heat insulation riser 5. The fire inlet is arranged on the back of the exhaust pipe body 9 and the air outlet flange surface 7. The height of the slag ladle 3 is 15-45 mm higher than that of the fire inlet, and the slag ladle 3 is a square riser or a round riser. The exhaust pipe is a four-cylinder exhaust pipe. The pouring system is formed by six pieces of one die. The casting process adopts back fire feeding, and cavity gas is sequentially discharged to a heat-preserving riser in the middle of the air inlet flange surface.
In this embodiment, the sprue 1 is vertically connected with the runners 2, the number of the runners 2 is four, each runner 2 is connected with three ingates 4, and the three ingates 4 are disposed at two sides of a single runner 2. The inner parts of the straight pouring gate 1, the transverse pouring gate 2 and the inner pouring gate 4 are communicated. In this embodiment, six exhaust pipe bodies 9 in total, each exhaust pipe body 9 is provided with a fire inlet at the back and the end face of the gas outlet flange 7, wherein the slag ladle 3 arranged at the end part of the fire inlet at the back is a square riser, and the slag ladle 3 arranged at the end part of the fire inlet at the end face of the gas outlet flange 7 is a round riser. Two heat preservation risers 5 are arranged in the middle of the air inlet flange 6. In actual production, cavity gas is sequentially discharged to an air inlet flange riser, an isolated air bag is not formed at the pipe wall, a casting bipartite factory directly uses triethylamine to produce a cold core, and the casting does not have the problem of skinning.
Example two
As shown in fig. 2, this embodiment provides an improvement of the back fire feeding process of the exhaust pipe of the high-nickel austenitic ductile cast iron engine, which is based on the first embodiment, unlike the first embodiment, in this embodiment, the number of the cross runners 2 is six, the end part of each cross runner 2 is connected with one short-circuit ingate 8, each short-circuit ingate 8 is connected with two ingates 4, and the tail end of the ingate 4 is connected with a fire inlet provided with a slag ladle 3. The two slag-accumulating bags 3 are round risers, and three heat-insulating risers 5 are arranged in the middle of the air inlet flange 6. The casting process adopts back fire feeding, and cavity gas is sequentially discharged to a heat-preserving riser in the middle of the air inlet flange surface. The embodiment is also a six-piece mold, no isolated air pocket is formed at the pipe wall, the triethylamine cold core is used for production, and the casting has no peeling problem.
Example III
As shown in fig. 3, this embodiment provides an improvement of the back fire feeding process of the exhaust pipe of the high nickel austenitic ductile cast iron engine, which is based on the first embodiment, unlike the first embodiment, the present embodiment is a mold eight, and the runners include two first runners 21 disposed at two ends of the sprue 1 and four second runners 22 disposed on the first runners 21, wherein two second runners 22 are disposed on one first runner 21, and the ends of the second runners 22 are connected with the inner runner 4. The eight exhaust pipe bodies 9 are bilaterally symmetrical and are the same up and down. The casting process adopts back fire feeding, and cavity gas is sequentially discharged to a heat-preserving riser in the middle of the air inlet flange surface. The embodiment is also eight pieces of a mould, no isolated air bag is formed at the pipe wall, the triethylamine cold core is used for production, and the casting has no peeling problem.
Comparative example
This comparative example provides a high nickel austenitic ball-cast engine vehicle exhaust pipe fire-in process, east-west molding line production, using a one-die two piece, air-in flange face riser, front fire-in, as shown in fig. 4. According to the production process, the air hole proportion of the casting is up to 30% in cold core test production of triethylamine, so that the actual production always uses a hot core box for core making, and even if the hot core is used, the peeling air hole proportion of the casting can be up to 20% in the humid air environment in summer. The skinning position is found to be a molten iron intersection position, and the molten iron intersection wraps the cavity gas, so that an isolated gas bag is formed. The problem of skinning of the casting produced before is serious, and the position corresponds to the identification position. If the problem of cold core skinning of castings is to be completely solved, the phenomenon that molten iron meets at the pipe wall position and an isolated air pocket appears is required to be avoided.
While the foregoing is directed to the preferred embodiments of the present utility model, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present utility model, and such modifications and adaptations are intended to be comprehended within the scope of the present utility model.
Claims (4)
1. The utility model provides a high nickel austenite nodular cast iron engine blast pipe back advances fire technology, includes casting technology and casting mould, casting mould includes sand mould, psammitolite and gating system, its characterized in that: the pouring system comprises a straight pouring gate, a cross pouring gate arranged at the lower part of the straight pouring gate and inner pouring gates arranged at two sides of the cross pouring gate; the tail end of the inner pouring channel is connected with a fire inlet provided with a slag accumulating bag, and the middle part of the air inlet flange surface of the exhaust pipe body is provided with a heat-insulating riser;
the fire inlet is arranged on the back of the exhaust pipe body and/or the air outlet flange surface;
the height of the slag accumulation bag is 15-45 mm higher than that of the fire inlet, and the slag accumulation bag is a square riser or a round riser.
2. The high nickel austenitic ductile iron engine exhaust back fire entering process of claim 1, wherein: the exhaust pipe is a four-cylinder or six-cylinder exhaust pipe.
3. The high nickel austenitic ductile iron engine exhaust back fire entering process of claim 1, wherein: the pouring system is a plurality of pieces.
4. The high nickel austenitic ductile iron engine exhaust back fire entering process of claim 1, wherein: the casting process adopts back fire feeding, and cavity gas is sequentially discharged to a heat-preserving riser in the middle of the air inlet flange surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811313623.9A CN109128032B (en) | 2018-11-06 | 2018-11-06 | High-nickel austenitic ductile iron engine exhaust pipe back fire feeding process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811313623.9A CN109128032B (en) | 2018-11-06 | 2018-11-06 | High-nickel austenitic ductile iron engine exhaust pipe back fire feeding process |
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| CN109128032A CN109128032A (en) | 2019-01-04 |
| CN109128032B true CN109128032B (en) | 2024-01-12 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109940134B (en) * | 2019-05-05 | 2024-02-27 | 山东格新精工有限公司 | DISA vertical green sand molding line cylinder mold and casting process thereof |
| CN110000339A (en) * | 2019-05-09 | 2019-07-12 | 上海圣德曼铸造海安有限公司 | A kind of sand mould structure of automobile engine exhaust pipe |
| CN111421115B (en) * | 2019-12-20 | 2021-12-14 | 西峡县内燃机进排气管有限责任公司 | Casting method of heat-resistant cast steel thin-wall exhaust manifold and sand mould for casting |
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