CN102921895B - Method for improving yield of heat-resistant steel exhaust manifold investment castings - Google Patents
Method for improving yield of heat-resistant steel exhaust manifold investment castings Download PDFInfo
- Publication number
- CN102921895B CN102921895B CN201210460130.4A CN201210460130A CN102921895B CN 102921895 B CN102921895 B CN 102921895B CN 201210460130 A CN201210460130 A CN 201210460130A CN 102921895 B CN102921895 B CN 102921895B
- Authority
- CN
- China
- Prior art keywords
- exhaust manifold
- head
- casting
- heat
- rising
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The invention relates to a method for improving the yield of heat-resistant steel exhaust manifold investment castings, which comprises the following steps: putting three risers on the flange side at the bottom of an exhaust manifold, and forming a casting head at the convergence port of four branch pipes of the exhaust manifold; and arranging exhaust pipes on the risers and connecting the exhaust pipes to the top of the pouring head. The method has the benefits that the process yield can be remarkably improved and is improved from the original 38.8 percent to 49.1 percent, and the relative improvement rate is close to 30 percent.
Description
Technical field
The invention belongs to metal casting technology, be specifically related to a kind of technological design scheme that improves automobile engine heat resisting steel exhaust manifold model casting casting process yield.
Background technology
Automobile gas exhausting manifold branch is to collect the waste gas of discharging from the each cylinder of engine the parts discharged to blast pipe, is one of engine eight large main parts size, and the height of whole gas extraction system operating efficiency depends on design and the manufacture of exhaust manifold.
At present, about the report of exhaust manifold casting technique has: application number is 200610107204.0, denomination of invention is the Chinese invention patent of " high nickel austenite spheroidal graphite cast iron automobile exhaust branch pipe and casting method ".In March, 2009, " based on AnyCasting exhaust manifold sand casting numerical simulation and the experimental study " that Chen Yong, Yang Xiangjie deliver; In October, 2011, " casting Technology Design of exhaust manifold foundry goods and optimization " that Zhao Xinwu, poplar placate etc. delivers all produces by sand casting.But all exist because of exhaust manifold structure complexity, sand casting somatotype difficulty, core loose piece is many, and combination core is many, and core is completely under the encirclement of high temperature iron liquid, and gas is difficult to the deficiency of discharging.Therefore in casting process, very easily there is the defects such as shrinkage porosite, shrinkage cavity, pore.
Based on exhaust manifold structure complexity, and the each spot size difference of exhaust manifold is large, and isolated thermal center is many, places rising head difficulty, produces to traditional sand casting and has brought larger difficulty.Model casting is a kind of Special Processes of Metal Castings technology complex-shaped, thin-walled parts that is particularly suitable for casting, and the foundry goods obtaining has higher dimensional accuracy and low surface roughness.In recent years, there is the exploration that model casting technology is produced automobile gas exhausting manifold branch, found but produce, adopted existing model casting design to produce the low deficiency of heat resisting steel automobile gas exhausting manifold branch product yield.
Summary of the invention
Produce the defects such as shrinkage porosite, shrinkage cavity, pore that vehicle engine exhaust divided manifold exists for solving sand casting process, the present invention adopts investment casting method to produce heat resisting steel exhaust manifold, and a kind of technological design scheme that improves heat resisting steel automobile gas exhausting manifold branch full form casting process yield rate is provided.
Exhaust manifold casting structure figure as shown in Figure 1.This exhaust manifold foundry goods is complex-shaped, and wall thickness dimension differs greatly, and tube wall place thickness is only 4mm, and thick thickness reaches 54mm; Isolated thermal center is many, places rising head difficulty; Meanwhile, model casting is not suitable for adopting placement chill to improve process of setting.According to product technology requirement, existing technological design scheme as shown in Figure 2, is specially: place three rising heads on flange in the bottom limit, offer dead head at mouthful place that converges of 4 arms.And three blast pipes are set on rising head are connected to cast gate middle part.Calculate with test result and show that the product yield of this process program is 38.8%.
Flowing of existing process program found with process of setting analysis, adopt sprue feeding, because the design of running channel spot size is excessive, reduce the product yield of foundry goods.According to product technology requirement, the invention provides a kind of optimization method of high technology yield rate, as shown in Figure 3.
Improving a design for heat resisting steel automobile gas exhausting manifold branch full form casting process yield rate, is to place three rising heads on exhaust manifold flange in the bottom limit, offers dead head at mouthful place that converges of 4 arms of exhaust manifold; And blast pipe is set on each rising head is connected to dead head top.
The distinguishing feature that the present invention compared with prior art had is:
1) change dead head structure, increased Riser Dimensions, to increase riser feeding distance, obtained the good foundry goods of surface quality.Rising head concrete structure and size are as Fig. 4, and shown in 6, volume is from original 78cm
3be increased to 126cm
3.
2) reduced sprue spot size, blast pipe has been moved to sprue top simultaneously.The concrete size of sprue is as Fig. 5, and shown in 7, volume is from the 958cm of former technique
3be decreased to 370cm
3.
3) significantly improve product yield.Product yield brings up to 49.1% by original 38.8%, relatively increase rate nearly 30%.
Accompanying drawing explanation
Fig. 1 is exhaust manifold structure schematic diagram.
Fig. 2 is existing technological design scheme schematic diagram.
Fig. 3 is the inventive method design schematic diagram.
Fig. 4 is existing process program rising head geometric graph.
Fig. 5 is existing process program sprue geometric graph.
Fig. 6 is technological design rising head geometric graph of the present invention.
Fig. 7 is technological design sprue geometric graph of the present invention.
In figure, dimensional units is mm.
The specific embodiment
Embodiment 1
The technological design of existing process program exhaust manifold
Place three rising heads on flange in the bottom limit, and offer cast gate at mouthful place that converges of 4 arms.Rising head volume is 78cm
3, (unit: mm) as shown in Figure 4.Sprue volume is 958cm
3, (unit: mm) as shown in Figure 5.There is shrinkage porosite, shrinkage cavity defect in the flange in the bottom of gained foundry goods and the contact-making surface of rising head, its product yield is 38.8%.
Embodiment 2
Process program exhaust manifold of the present invention technological design
Place three rising heads on flange in the bottom limit, and offer cast gate at mouthful place that converges of 4 arms.Rising head volume is 126cm
3, (unit: mm) as shown in Figure 6, sprue volume is 370cm
3, (unit: mm) as shown in Figure 7.The flange in the bottom of gained foundry goods and the contact-making surface of rising head are without shrinkage porosite, shrinkage cavity defect, and its product yield reaches 49.1%.
Claims (1)
1. improving a method for heat resisting steel automobile gas exhausting manifold branch model casting yield rate, is to place three rising heads on exhaust manifold flange in the bottom limit, offers dead head at mouthful place that converges of 4 arms of exhaust manifold; And blast pipe is set on each rising head is connected to dead head top; Rising head is " L " type, and rising head volume is increased to 126cm
3, sprue is the assembly of round platform and cylinder, sprue volume is decreased to 370cm
3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210460130.4A CN102921895B (en) | 2012-11-15 | 2012-11-15 | Method for improving yield of heat-resistant steel exhaust manifold investment castings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210460130.4A CN102921895B (en) | 2012-11-15 | 2012-11-15 | Method for improving yield of heat-resistant steel exhaust manifold investment castings |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102921895A CN102921895A (en) | 2013-02-13 |
| CN102921895B true CN102921895B (en) | 2014-07-09 |
Family
ID=47636900
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210460130.4A Expired - Fee Related CN102921895B (en) | 2012-11-15 | 2012-11-15 | Method for improving yield of heat-resistant steel exhaust manifold investment castings |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102921895B (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0284229A (en) * | 1988-09-20 | 1990-03-26 | Mitsubishi Motors Corp | Expendable pattern casting method |
| JPH0399747A (en) * | 1989-09-11 | 1991-04-24 | Honda Motor Co Ltd | Method for casting dual type exhaust manifold |
| CN2452648Y (en) * | 2000-11-02 | 2001-10-10 | 沈兴关 | Temp. keeping riser |
| CN102554130B (en) * | 2012-01-31 | 2014-08-13 | 西峡县内燃机进排气管有限责任公司 | Casting method for high-nickel austenite nodular cast iron exhaust manifold |
-
2012
- 2012-11-15 CN CN201210460130.4A patent/CN102921895B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN102921895A (en) | 2013-02-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100364693C (en) | Casting method for exhaust branch pipe of thin-wall ball iron triplet | |
| CN102489667B (en) | Casting method for spheroidal graphite cast iron main bearing cap of gasoline engine and casting mould applying same | |
| CN103506580B (en) | The casting method of large-scale thin-wall valve body steel-casting | |
| CN104148587B (en) | The casting method and device of brake disc disk body and thus obtained brake disc disk body | |
| CN102554130B (en) | Casting method for high-nickel austenite nodular cast iron exhaust manifold | |
| CN205904387U (en) | Nickelic magnesium iron blast pipe the gating system | |
| CN103273006B (en) | A kind of fitting device of Sand-Faced Metal Mould Casting brake-shoe and production method | |
| CN103203432B (en) | Cast steel wheel center mold and using method thereof | |
| CN103480804B (en) | A kind of casting method without chill marine diesel cylinder cover | |
| CN201768879U (en) | Vertical casting mould for nodular cast iron | |
| CN104190874B (en) | Super-low sulfur phosphorus HTHP valve body cast shaping process | |
| CN102049472A (en) | Method for casting special case casting core mould | |
| CN101486071B (en) | Technique and equipment for pouring flanged fitting combination | |
| CN103639370A (en) | Casting method for flywheel | |
| CN109128032B (en) | High-nickel austenitic ductile iron engine exhaust pipe back fire feeding process | |
| CN112872297A (en) | Stepped feeding casting process for large-scale profile section casting | |
| CN104174819A (en) | Casting technology for three-stage planetary frame of ocean platform climbing machine | |
| CN102921895B (en) | Method for improving yield of heat-resistant steel exhaust manifold investment castings | |
| CN103008562A (en) | Vertical casting device for integral cylinder head casting | |
| CN208712834U (en) | It is a kind of to can be realized low pressure casting die cooling step by step | |
| CN104525869A (en) | A casting method of an ultrafine high-nickel-content air tube | |
| CN201419230Y (en) | Core for water jacket of engine cylinder cover | |
| CN109719241B (en) | Short-process casting and forging integrated process for steel | |
| CN103551509A (en) | HXB2 axle box casting method | |
| CN104028700A (en) | Cylinder body water jacket core and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140709 Termination date: 20161115 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |