CN109128032A - A kind of high-nickel austenite nodular cast iron exhaust pipe of engine back is into fire process - Google Patents
A kind of high-nickel austenite nodular cast iron exhaust pipe of engine back is into fire process Download PDFInfo
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- CN109128032A CN109128032A CN201811313623.9A CN201811313623A CN109128032A CN 109128032 A CN109128032 A CN 109128032A CN 201811313623 A CN201811313623 A CN 201811313623A CN 109128032 A CN109128032 A CN 109128032A
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- casting
- exhaust pipe
- cast iron
- nodular cast
- fire
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 230000008569 process Effects 0.000 title claims abstract description 21
- 229910001566 austenite Inorganic materials 0.000 title claims abstract description 17
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 17
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 17
- 229910001141 Ductile iron Inorganic materials 0.000 title claims abstract description 16
- 238000005266 casting Methods 0.000 claims abstract description 53
- 239000002893 slag Substances 0.000 claims abstract description 19
- 239000004576 sand Substances 0.000 claims abstract description 12
- 239000003818 cinder Substances 0.000 claims 1
- 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 21
- 229910052742 iron Inorganic materials 0.000 abstract description 14
- 239000007788 liquid Substances 0.000 abstract description 12
- 238000013461 design Methods 0.000 abstract description 5
- 239000002002 slurry Substances 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 229910001018 Cast iron Inorganic materials 0.000 description 3
- 229910018487 Ni—Cr Inorganic materials 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 208000002352 blister Diseases 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000002500 effect on skin Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000007528 sand casting 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
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 invention discloses a kind of high-nickel austenite nodular cast iron exhaust pipe of engine backs into fire process, belong to automobile part production technique field, including casting technique and casting mould, the casting mould includes sand mold, sand core and running gate system, and the running gate system includes sprue, the cross gate that the sprue lower part is arranged in, the ingate that the cross gate two sides are arranged in；Insulated feeder is arranged in inlet flange Middle face with being connected into burner for accumulated slag packet, the exhaust tube body is equipped in the end of the ingate.From casting back into fire, casting type cavity gas is discharged the present invention from inlet flange riser, guarantees in casting process, iron liquid does not wrap up isolated gas bag；On the one hand casting slows down iron liquid to the impact force of type chamber, iron liquid is made steadily to enter type chamber into burner Front-end Design accumulated slag packet, and avoid being mingled with into other casting flaws such as slurries；It solves the problems, such as sand buckle, stomata, shrinkage porosite, while being also applied for the production casting of triethylamine cold core.
Description
Technical field
The present invention relates to automobile part production technique fields, and in particular to a kind of high-nickel austenite nodular cast iron engine
Exhaust pipe back is into fire process.
Background technique
The high-nickel austenite nodular cast iron exhaust pipe of engine has a wide range of applications in medium-to-high grade motorcar engine.Sand
Mold casting is the basic technology for producing high-Ni-Cr cast iron casting in enormous quantities.Triethylamine method cold core box coremaking has energy-efficient, casting
The advantages that surface quality is good, and dimensional accuracy is high, and sand core is defeated and dispersed good is suitable for sand casting and produces in enormous quantities.
High-Ni-Cr cast iron has molten steel flow poor, and solidification shrinkage is big, the process characteristics such as pouring temperature height.Shrinkage Porosity tendency
Greatly, surface be easily mingled with, peeling.Exhaust pipe structure is complicated simultaneously, in irregular shape, and runner precision is high, and wall thickness is relatively thin, founder
Skill difficulty is big.
In actual casting production application, since precoated sand weary tolerance is big, the reasons such as Design of Runner System is unreasonable, peeling
Problem happens occasionally, bleb, shrinkage defect ratio are very big, restricts the production of product.Especially make in mass production
When with triethylamine cold core, peeling is choked, and fire is especially serious, and rate of wasted casting product is high.In order to improve casting yield, production effect is improved
Rate needs to set about from running gate system, seeks a kind of ideal solution.
The patent document of Publication No. CN201410432490.2 discloses light-duty vehicle exhaust pipe pouring technology, and feature exists
In including following technical process: the position of cast gate being moved on to the nozzle position among exhaust pipe from avris, manages molten iron from two
Mouthful injection type chamber, so that the intracavitary gas of type is in the case where rising molten iron and pushing, respectively by two casting channels discharges, at the same time again
Timely have adjusted the gap of core print.But in the pouring technology, the intracavitary gas of type is discharged out of casting channel, sand buckle
The defects of fiery phenomenon of choking is serious, stomata, shrinkage porosite is more, and product qualified rate is low.
Notification number is that the patent of CN205904387U discloses a kind of high-Ni-Cr cast iron exhaust pipe running gate system, including directly pours
Road, the cross gate that sprue lower part two sides are set, the ingate that the cross gate two sides are set；The ingate end
End connection feeding head, the feeding head are connected by being shorted ingate with the inlet flange face for being vented tube body both sides side
It connects, insulated feeder is arranged in inlet flange Middle face in the exhaust tube body, is arranged on the outlet flange of the exhaust tube body
Insulated feeder；Using the utility model when being poured to the type exhaust pipe, so that product yield is mentioned by original 33%
Rise to 42%；The use that ceramics keep away slag net is eliminated simultaneously, solves the phenomenon that outlet flange root shrinkage porosite gas leakage；Also the production made
Product qualification rate is promoted to 94% by original 69%；The leakproofness of exhaust pipe and toughness can also be made to greatly improve simultaneously, the row of improving
The service life of tracheae, has saved maintenance cost.But the system uses front into fire, although improving the yield rate of product,
Peeling defect phenomenon is serious, accounts for 15-30%, and casting defect ware rate is high, needs to put into a large amount of repair time and cost, influences
Product quality.
Summary of the invention
In view of this, the present invention provides a kind of high-nickel austenite nodular cast iron exhaust pipe of engine backs into fire process,
It solves the problems, such as sand buckle stomata, while being also applied for the production casting of triethylamine cold core.
In order to solve the above technical problems, the technical solution used in the present invention is:
A kind of high-nickel austenite nodular cast iron exhaust pipe of engine back is into fire process, including casting technique and casting mould, institute
Stating casting mould includes sand mold, sand core and running gate system, and the running gate system includes sprue, is arranged in the sprue lower part
Cross gate, the ingates of the cross gate two sides is set；The end of the ingate be equipped with accumulated slag packet into burner phase
Insulated feeder is arranged in inlet flange Middle face in connection, the exhaust tube body.
Further, back and/or the outlet flange face that exhaust tube body is set into burner.
Further, the accumulated slag packet height is higher than described into 15 ~ 45mm of burner, and the accumulated slag packet is rectangular riser or circle
Shape riser.
Further, the exhaust pipe is four cylinders or six cylinder exhaust pipes.
Further, the running gate system is one-mold multiple-member.
Further, using back into fire, type cavity gas is successively expelled in the inlet flange face casting technique
The insulated feeder in portion.
The beneficial effects of the present invention are:
Previous mo(u)lding line production, a mould two pieces, inlet flange face riser are positive into fire.This production technology, the examination life of triethylamine cold core
It produces, bleb ratio is up to 30%, therefore actual production uses always hot box process, even hot core, in summer air tide
Under wet environment, sand buckle stomata ratio can also reach fast 20%.Later, sunykatuib analysis is carried out to casting technique, finds peeling
Position is that iron liquid crosses position, and iron liquid crosses and wraps up type cavity gas, forms isolated gas bag.Sand buckle problem is produced before
Seriously, it if to be fully solved casting cold core peeling problem, needs that iron liquid is avoided to cross in pipe wall position, isolated gas bag occurs.
On this basis, mold and technique are redesigned, in casting into burner, design has accumulated slag packet, and accumulated slag packet can have
Variform can be rectangular riser, be also possible to round riser, and single accumulated slag packet height is higher than into 15 ~ 45mm of burner or so.Type chamber
Gas is successively expelled to inlet flange riser, does not form isolated gas bag in pipe wall position.
From casting back into fire, casting type cavity gas is discharged the present invention from inlet flange riser, guarantees in casting process, iron
Liquid does not wrap up isolated gas bag.On the one hand casting slows down iron liquid to the impact force of type chamber, makes iron liquid into burner Front-end Design accumulated slag packet
Steadily enter type chamber, and avoids being mingled with into other casting problems such as slurries.
The present invention changes original Design of Runner System mode completely, is applied to triethylamine cold core process conscientiously
In actual production, using one-mold multiple-member, production efficiency is improved, has saved production cost, casting is qualified substantially without skin effect phenomenon
Rate reaches 96.5% or more.
Detailed description of the invention
The present invention is described in further detail with reference to the accompanying drawing.
Fig. 1 is the structural schematic diagram of the running gate system of the casting mould of the embodiment of the present invention one.
Fig. 2 is the structural schematic diagram of the running gate system of the casting mould of the embodiment of the present invention two.
Fig. 3 is the structural schematic diagram of the running gate system of the casting mould of the embodiment of the present invention three.
Fig. 4 is the structural schematic diagram of the running gate system of the casting mould of comparative example of the present invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
Attached drawing 1-4, the technical solution of the embodiment of the present invention is clearly and completely described.Obviously, described embodiment is this
A part of the embodiment of invention, instead of all the embodiments.Based on described the embodiment of the present invention, the common skill in this field
Art personnel every other embodiment obtained, shall fall within the protection scope of the present invention.
Embodiment one
As shown in Figure 1, this embodiment offers a kind of high-nickel austenite nodular cast iron exhaust pipe of engine backs into fire process, packet
Include casting technique and casting mould, casting mould includes sand mold, sand core and running gate system, the running gate system include sprue 1,
The ingate 4 that the cross gate 2 of 1 lower part of sprue is set, 2 two sides of cross gate are set；The end of the ingate 4
It holds and is equipped with being connected into burner for accumulated slag packet 3, insulated feeder 5 is arranged in the exhaust tube body 9 in the middle part of inlet flange face 6.
Back and the outlet flange face 7 that exhaust tube body 9 is set into burner.3 height of accumulated slag packet is higher than described into burner
15 ~ 45mm, the accumulated slag packet 3 are rectangular riser or round riser.The exhaust pipe is four cylinder exhaust pipes.The running gate system is
One mould six.For the casting technique using back into fire, type cavity gas is successively expelled to the heat preservation of the inlet flange Middle face
Riser.
Wherein, in the present embodiment, sprue 1 is vertical with cross gate 2 to be connect, and the number of cross gate 2 is four, each horizontal to pour
Three ingates 4 are connected on road 2, the two sides of single cross gate 2 are arranged in three ingates 4.It sprue 1, cross gate 2 and interior pours
The inside in road 4 is connected.In the present embodiment, amount to six exhaust tube bodies 9, each exhaust tube body 9 is at back and outlet
The end face of flange 7 is respectively provided with into burner, and wherein the accumulated slag packet 3 being arranged into burner end at back is rectangular riser, outlet flange 7
The accumulated slag packet 3 that end face is arranged into burner end is round riser.Two insulated feeders 5 are set in the middle part of inlet flange 6.Actual production
In, type cavity gas is successively expelled to inlet flange riser, does not form isolated gas bag in pipe wall position, two subsidiary factories of casting directly make
It is produced with triethylamine cold core, casting is without peeling problem.
Embodiment two
As shown in Fig. 2, this embodiment offers a kind of high-nickel austenite nodular cast iron exhaust pipe of engine backs into fire process, it is
The improvement carried out on the basis of example 1, what is different from the first embodiment is that the number of cross gate 2 is six in the present embodiment
A, the end of each cross gate 2 is all connected with a short circuit ingate 8, and each short circuit ingate 8 connects two ingates 4, inside pours
The end in road 4 being connected with accumulated slag packet 3 is equipped with into burner.Two accumulated slag packets 3 are round riser, are set in the middle part of inlet flange 6
Set three insulated feeders 5.For the casting technique using back into fire, type cavity gas is successively expelled to the inlet flange Middle face
Insulated feeder.The present embodiment is similarly a mould six, does not form isolated gas bag in pipe wall position, raw using triethylamine cold core
It produces, casting is without peeling problem.
Embodiment three
As shown in figure 3, this embodiment offers a kind of high-nickel austenite nodular cast iron exhaust pipe of engine backs into fire process, it is
The improvement carried out on the basis of example 1, what is different from the first embodiment is that the present embodiment is a mould eight, cross gate includes
Two first four second cross gates 22 cross gate 21 and be arranged on the first cross gate 21 at 1 both ends of sprue are set,
Wherein, two the second cross gates 22 are set on first cross gate 21, and the end of the second cross gate 22 is connected with ingate 4
It connects.Eight 9 bilateral symmetries of exhaust tube body are identical up and down.Using back into fire, type cavity gas is successively discharged the casting technique
To the insulated feeder of the inlet flange Middle face.The present embodiment is similarly a mould eight, is not formed in pipe wall position isolated
Gas bag is produced using triethylamine cold core, and casting is without peeling problem.
Comparative example
The comparative example provides a kind of casting of high-nickel austenite spheroidal graphite and starts engine vent pipe into fire process, east mo(u)lding line production long,
Using a mould two pieces, inlet flange face riser, front is into fire, as shown in Figure 4.This production technology, the trial production of triethylamine cold core, casting
Part stomata ratio is up to 30%, therefore actual production uses always hot box process, even hot core, what in summer, there was dampness in the air
Under environment, sand buckle stomata ratio can also reach fast 20%.It was found that peeling position is that iron liquid crosses position, and iron liquid crosses
Type cavity gas is wrapped up, isolated gas bag is formed.Production sand buckle problem is serious before, and position is also corresponded in home position.If
It is fully solved casting cold core peeling problem, needs that iron liquid is avoided to cross in pipe wall position, isolated gas bag occurs.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principles of the present invention, it can also make several improvements and retouch, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (6)
1. a kind of high-nickel austenite nodular cast iron exhaust pipe of engine back is into fire process, including casting technique and casting mould,
The casting mould includes sand mold, sand core and running gate system, it is characterised in that: the running gate system include sprue, setting exist
The cross gate of the sprue lower part, the ingate that the cross gate two sides are set；The end of the ingate be equipped with product
Cinder ladle is connected into burner, and insulated feeder is arranged in inlet flange Middle face in the exhaust tube body.
2. a kind of high-nickel austenite nodular cast iron exhaust pipe of engine back as described in claim 1 is into fire process, feature
It is: back and/or the outlet flange face that exhaust tube body is set into burner.
3. a kind of high-nickel austenite nodular cast iron exhaust pipe of engine back as described in claim 1 is into fire process, feature
Be: for the accumulated slag packet height higher than described into 15 ~ 45mm of burner, the accumulated slag packet is rectangular riser or round riser.
4. a kind of high-nickel austenite nodular cast iron exhaust pipe of engine back as described in claim 1 is into fire process, feature
Be: the exhaust pipe is four cylinders or six cylinder exhaust pipes.
5. a kind of high-nickel austenite nodular cast iron exhaust pipe of engine back as described in claim 1 is into fire process, feature
Be: the running gate system is one-mold multiple-member.
6. a kind of high-nickel austenite nodular cast iron exhaust pipe of engine back as described in claim 1 is into fire process, feature
Be: for the casting technique using back into fire, type cavity gas is successively expelled to the insulated feeder of the inlet flange Middle face.
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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109128032A true CN109128032A (en) | 2019-01-04 |
| CN109128032B CN109128032B (en) | 2024-01-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811313623.9A Active CN109128032B (en) | 2018-11-06 | 2018-11-06 | High-nickel austenitic ductile iron engine exhaust pipe back fire feeding process |
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Cited By (3)
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|---|---|---|---|---|
| CN109940134A (en) * | 2019-05-05 | 2019-06-28 | 山东格新精工有限公司 | A kind of vertical green sand molding line cylinder mold of DISA and its casting technique |
| 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 |
| CN111421115A (en) * | 2019-12-20 | 2020-07-17 | 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109940134A (en) * | 2019-05-05 | 2019-06-28 | 山东格新精工有限公司 | A kind of vertical green sand molding line cylinder mold of DISA and its casting technique |
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| 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 |
| CN111421115A (en) * | 2019-12-20 | 2020-07-17 | 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 |
| 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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| Publication number | Publication date |
|---|---|
| CN109128032B (en) | 2024-01-12 |
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