CN107523744A - A kind of casting method of inexpensive bent axle - Google Patents
A kind of casting method of inexpensive bent axle Download PDFInfo
- Publication number
- CN107523744A CN107523744A CN201710984812.8A CN201710984812A CN107523744A CN 107523744 A CN107523744 A CN 107523744A CN 201710984812 A CN201710984812 A CN 201710984812A CN 107523744 A CN107523744 A CN 107523744A
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- China
- Prior art keywords
- casting
- mould
- sand
- weight
- molten iron
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Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/04—Cast-iron alloys containing spheroidal graphite
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/06—Cast-iron alloys containing chromium
Abstract
The invention discloses a kind of casting method of inexpensive bent axle, the casting method comprises the following steps：1) formative technology；2) melting batch；3) molten iron is refined, wherein refining temperature is 1510 DEG C；4) breed three times；5) pour into a mould：Molten iron after inoculation is poured into shell mould casting mold, wherein pouring temperature is 1380 DEG C~1400 DEG C；Unpack：Unpacked after casting complete in 52 55 minutes and take out casting, the casting is cooled to nature, sand is fallen, burr polishing is cleaned out；And tempering.The present invention shortens the production cycle in the case where ensureing mechanical performance, reduces production cost.
Description
Technical field
The present invention relates to a kind of casting process, particularly a kind of casting method of inexpensive bent axle.
Background technology
For engine, bent axle is one of strength member of engine, and its structure and stress are all extremely complex, work
Load is big, and the requirement to material is very high.Tradition uses at present high intensity, high-elongation QT800-6 bent axles use in cast
Late inoculation；After cast terminates, nature is cooled to, falls drop, polishing cleans out burr；Then it is put into normalizing furnace,
Again heat up normalizing；After crankcase temperature reaches the temperature of normalizing, take out bent axle and be placed on cooling car, using water smoke cooling just
Fire, during cooling, the turning crankshaft in misting cooling, make bent axle normalizing uniform；After the completion of normalizing, then use tempering side
Formula goes de-stress, then carries out cleaning circulation.In such a mode, casting is before normalized treatment, most as cast condition bent axle elongation percentage
More than 6% can not be stably reached, normalized treatment is primarily to improve the elongation percentage of bent axle, and production power consumption is high, and production cost is high,
Life cycle of the product is grown, and labor intensity is big.
The content of the invention
It is an object of the present invention to provide a kind of casting method of inexpensive bent axle.The present invention is ensureing mechanical performance
In the case of, shorten the production cycle, reduce production cost.
Technical scheme：A kind of casting method of inexpensive bent axle, it is characterised in that the casting method includes
Following steps：
1) formative technology：A, using resin sand, the degree of its composition is as follows for raw material：Resin 1.2%；Curing agent
0.3%；Remaining is molding sand；B, sand mold is made using described resin sand, with forming resin bonded sand mould after mould mould assembling, and made
The axial line of Shi Suoshu resin bonded sand mould is parallel with horizontal plane, after the completion of described resin bonded sand mould axial line and horizontal plane phase
Vertically；C, described resin bonded sand mould forms ￠ 45mm down gate, ￠ 40mm ingate is single pours into, described down gate with
Ingate is connected by horizontal runway；
2) melting batch：It is by weight 20 parts of the pig iron, 45 parts of 35 parts of foundry returns, steel scrap prepared furnace charges, will prepares
Furnace charge be placed in middle frequency furnace and carry out melting, Carbon pick-up is carried out using carburant, and add manganese, tin and copper, makes to dissolve
The composition by weight percent of molten iron afterwards is Cu：0.4%th, Sn：0.05%th, Mn：0.70-0.75%, C：4.0-4.1%, S：≤
0.02%th, Si：2.5-2.6%, P：≤ 0.03%, Ti：＜ 0.04%, Mg：0.03-0.06%；
3) molten iron is refined, wherein refining temperature is 1510 DEG C；
4) breed three times, including：Nodularization and first time inoculation are carried out simultaneously, molten iron is subjected to spheroidization and inoculation processing,
Wherein the weight of nodulizer taps a blast furnace the 0.9% of water to be predetermined, wrap in the weight of inovulant that adds be the predetermined molten iron discharging
The 0.9% of amount；Second of inoculation：Wherein when water of tapping a blast furnace is the 4/5 of the predetermined water of tapping a blast furnace, random inoculant
Weight predetermined taps a blast furnace the 0.6% of water to be described；Third time inoculation：After wherein the slag of molten iron is cleaned out, cross bag and add
Enter the weight of inovulant and tap a blast furnace the 0.35% of water to be predetermined；
5) pour into a mould：Molten iron after inoculation is poured into shell mould casting mold, wherein pouring temperature is 1380 DEG C~1400 DEG C；Open
Case：Unpacked after casting complete in 52-55 minutes and take out casting, the casting is cooled to nature, sand is fallen, will be draped over one's shoulders
Cutting edge of a knife or a sword polishing cleans out；And tempering.
In the casting method of foregoing inexpensive bent axle, the refinement step terminates the weight of the chemical composition in rear molten iron
Percentage is：C：3.35%；Si：1.2%；Mn：0.35%；Cu：0.75~1.0%；P ＜ 0.07%；S ＜ 0.020%；Cr ＜
0.25。
Compared with prior art, 1.2% resin that the present invention uses, the resin sand conduct of 0.3% curing agent composition
Molding sand, Forming Quality are good；Present invention eliminates the normalized treatment process of traditional mode of production, have adjusted each chemical element in crankshaft material
Content proportioning, and more effectively refined graphite using breeding three times before pouring into a mould, and improve the roundness of graphite nodule, carried
The high performance of material, makes the intensity of bent axle and elongation percentage identical with traditional bent axle, effectively reduces the cost of product, shortening
Production cycle.The present invention in molten iron by adding the alloying elements such as Cu, Sn, Mn, increase and refinement pearlite；By in ball
Change first time inoculation, second of intensive inoculation processing and the third time inoculation in processing bag, increase external nucleus, make
Crystal grain and graphite are tiny, and graphite nodule roundness improves；The control with technical parameters such as pouring temperatures is selected, to obtaining required pearl
Body of light amount and its stability have guaranteeing role, so as to improve the tensile strength of bent axle, bent axle material is stably reached skill
Art requirement.By the casting technique of the present invention, the defect rate of bent axle product is low, and qualification rate is up to more than 99.5%, Ge Xiangxing
It can reach standard, wherein：Tensile strength up to 720MPa, elongation percentage 6.8 or so, body hardness HB230-240 it
Between.
Embodiment
With reference to embodiment, the present invention is further illustrated, but is not intended as the foundation limited the present invention.
Embodiment.A kind of casting method of inexpensive bent axle, it is characterised in that the casting method comprises the following steps：
1) formative technology：A, using resin sand, the degree of its composition is as follows for raw material：Resin 1.2%；Curing agent
0.3%；Remaining is molding sand；B, sand mold is made using described resin sand, with forming resin bonded sand mould after mould mould assembling, and made
The axial line of Shi Suoshu resin bonded sand mould is parallel with horizontal plane, after the completion of described resin bonded sand mould axial line and horizontal plane phase
Vertically；C, described resin bonded sand mould forms ￠ 45mm down gate, ￠ 40mm ingate is single pours into, described down gate with
Ingate is connected by horizontal runway；
2) melting batch：It is by weight 20 parts of the pig iron, 45 parts of 35 parts of foundry returns, steel scrap prepared furnace charges, will prepares
Furnace charge be placed in middle frequency furnace and carry out melting, Carbon pick-up is carried out using carburant, and add manganese, tin and copper, makes to dissolve
The composition by weight percent of molten iron afterwards is Cu：0.4%th, Sn：0.05%th, Mn：0.70-0.75%, C：4.0-4.1%, S：≤
0.02%th, Si：2.5-2.6%, P：≤ 0.03%, Ti：＜ 0.04%, Mg：0.03-0.06%；
3) molten iron is refined, wherein refining temperature is 1510 DEG C；
4) breed three times, including：Nodularization and first time inoculation are carried out simultaneously, molten iron is subjected to spheroidization and inoculation processing,
Wherein the weight of nodulizer taps a blast furnace the 0.9% of water to be predetermined, wrap in the weight of inovulant that adds be the predetermined molten iron discharging
The 0.9% of amount；Second of inoculation：Wherein when water of tapping a blast furnace is the 4/5 of the predetermined water of tapping a blast furnace, random inoculant
Weight predetermined taps a blast furnace the 0.6% of water to be described；Third time inoculation：After wherein the slag of molten iron is cleaned out, cross bag and add
Enter the weight of inovulant and tap a blast furnace the 0.35% of water to be predetermined；
5) pour into a mould：Molten iron after inoculation is poured into shell mould casting mold, wherein pouring temperature is 1380 DEG C~1400 DEG C；Open
Case：Unpacked after casting complete in 52-55 minutes and take out casting, the casting is cooled to nature, sand is fallen, will be draped over one's shoulders
Cutting edge of a knife or a sword polishing cleans out；And tempering.
The percentage by weight that the refinement step terminates the chemical composition in rear molten iron is：C：3.35%；Si：1.2%；
Mn：0.35%；Cu：0.75~1.0%；P ＜ 0.07%；S ＜ 0.020%；Cr ＜ 0.25.
1.2% resin that the present invention uses, the resin sand of 0.3% curing agent composition are good as molding sand, Forming Quality；
Present invention eliminates the normalized treatment process of traditional mode of production, have adjusted the content proportioning of each chemical element in crankshaft material, and
Using breeding three times before cast, graphite has more effectively been refined, and has improved the roundness of graphite nodule, has improved the performance of material,
Make intensity and the elongation percentage of bent axle identical with traditional bent axle, effectively reduce the cost of product, shorten the production cycle.This hair
It is bright to pass through the alloying element such as addition Cu, Sn, Mn in molten iron, increase and refinement pearlite；Pass through in spheroidising bag
Inoculation, second of intensive inoculation processing and third time inoculation, increase external nucleus, make crystal grain and graphite thin
It is small, and graphite nodule roundness improves；The control with technical parameters such as pouring temperatures is selected, to the either pearlite occurred needed for acquisition and its surely
It is qualitative that there is guaranteeing role, so as to improve the tensile strength of bent axle, bent axle material is stably reached technical requirements.Pass through this
The casting technique of invention, the defect rate of bent axle product is low, and qualification rate is up to more than 99.5%, and properties can reach mark
Standard, wherein：Tensile strength is up to 720MPa, and elongation percentage is 6.8 or so, and body hardness is between HB230-240.
Claims (2)
1. a kind of casting method of inexpensive bent axle, it is characterised in that the casting method comprises the following steps：
1) formative technology：A, using resin sand, the degree of its composition is as follows for raw material：Resin 1.2%；Curing agent
0.3%；Remaining is molding sand；B, sand mold is made using described resin sand, with forming resin bonded sand mould after mould mould assembling, and made
The axial line of Shi Suoshu resin bonded sand mould is parallel with horizontal plane, after the completion of described resin bonded sand mould axial line and horizontal plane phase
Vertically；C, described resin bonded sand mould forms ￠ 45mm down gate, ￠ 40mm ingate is single pours into, described down gate with
Ingate is connected by horizontal runway；
2) melting batch：It is by weight 20 parts of the pig iron, 45 parts of 35 parts of foundry returns, steel scrap prepared furnace charges, the stove that will be prepared
Material, which is placed in middle frequency furnace, carries out melting, and Carbon pick-up is carried out using carburant, and adds manganese, tin and copper, makes after dissolving
The composition by weight percent of molten iron is Cu：0.4%th, Sn：0.05%th, Mn：0.70-0.75%, C：4.0-4.1%, S：≤
0.02%th, Si：2.5-2.6%, P：≤ 0.03%, Ti：＜ 0.04%, Mg：0.03-0.06%；
3) molten iron is refined, wherein refining temperature is 1510 DEG C；
4) breed three times, including：Nodularization and first time inoculation are carried out simultaneously, molten iron is subjected to spheroidization and inoculation processing, wherein
The weight of nodulizer taps a blast furnace the 0.9% of water to be predetermined, wrap in the weight of inovulant that adds be the predetermined water of tapping a blast furnace
0.9%；Second of inoculation：Wherein when water of tapping a blast furnace is the 4/5 of the predetermined water of tapping a blast furnace, the weight of random inoculant
Predetermined the 0.6% of water is tapped a blast furnace to be described；Third time inoculation：After wherein the slag of molten iron is cleaned out, it is pregnant to cross bag addition
Educate the weight of agent and tap a blast furnace the 0.35% of water to be predetermined；
5) pour into a mould：Molten iron after inoculation is poured into shell mould casting mold, wherein pouring temperature is 1380 DEG C~1400 DEG C；Unpack：
Unpacked after casting complete in 52-55 minutes and take out casting, the casting is cooled to nature, sand is fallen, by burr
Polishing cleans out；And tempering.
2. the casting method of inexpensive bent axle according to claim 1, it is characterised in that the refinement step terminates rear iron
The percentage by weight of chemical composition in water is：C：3.35%；Si：1.2%；Mn：0.35%；Cu：0.75~1.0%；P ＜
0.07%；S ＜ 0.020%；Cr ＜ 0.25.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710984812.8A CN107523744A (en) | 2017-10-20 | 2017-10-20 | A kind of casting method of inexpensive bent axle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710984812.8A CN107523744A (en) | 2017-10-20 | 2017-10-20 | A kind of casting method of inexpensive bent axle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107523744A true CN107523744A (en) | 2017-12-29 |
Family
ID=60684853
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710984812.8A Withdrawn CN107523744A (en) | 2017-10-20 | 2017-10-20 | A kind of casting method of inexpensive bent axle |
Country Status (1)
| Country | Link |
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| CN (1) | CN107523744A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110576148A (en) * | 2019-09-19 | 2019-12-17 | 许智勇 | Casting process of automobile crankshaft |
| CN111850383A (en) * | 2020-08-04 | 2020-10-30 | 富士和机械工业（昆山）有限公司 | High-strength and high-elongation nodular cast iron material and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102259159A (en) * | 2011-06-08 | 2011-11-30 | 苏州市海威特铸造厂 | Process for casting crank shaft |
| CN104745917A (en) * | 2013-12-25 | 2015-07-01 | 青岛玉光精铸厂 | Casting process for crankshaft |
| CN105945235A (en) * | 2016-06-30 | 2016-09-21 | 广西玉柴机器股份有限公司 | Crankshaft casting method |
-
2017
- 2017-10-20 CN CN201710984812.8A patent/CN107523744A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102259159A (en) * | 2011-06-08 | 2011-11-30 | 苏州市海威特铸造厂 | Process for casting crank shaft |
| CN104745917A (en) * | 2013-12-25 | 2015-07-01 | 青岛玉光精铸厂 | Casting process for crankshaft |
| CN105945235A (en) * | 2016-06-30 | 2016-09-21 | 广西玉柴机器股份有限公司 | Crankshaft casting method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110576148A (en) * | 2019-09-19 | 2019-12-17 | 许智勇 | Casting process of automobile crankshaft |
| CN111850383A (en) * | 2020-08-04 | 2020-10-30 | 富士和机械工业（昆山）有限公司 | High-strength and high-elongation nodular cast iron material and preparation method thereof |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20171229 |
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| WW01 | Invention patent application withdrawn after publication |