CN104259390B - A kind of casting method of car engine cover - Google Patents
A kind of casting method of car engine cover Download PDFInfo
- Publication number
- CN104259390B CN104259390B CN201410515784.1A CN201410515784A CN104259390B CN 104259390 B CN104259390 B CN 104259390B CN 201410515784 A CN201410515784 A CN 201410515784A CN 104259390 B CN104259390 B CN 104259390B
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- Prior art keywords
- engine cover
- car engine
- alloy
- casting method
- ceramic
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Classifications
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- 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
- B22C9/04—Use of lost patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
-
- 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
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
Abstract
The present invention relates to the casting method of a kind of car engine cover.Ceramic wear-resisting granule is replaced refractory material by the present invention, the liquid coating being made into binding agent is coated in module surface, make pattern, the molten fusible pattern that loses, injection alloy liquid, along with the cooled and solidified of the alloy liquid injected forms foundry goods, ceramic wear-resisting granule is introduced cast(ing) surface, subsequently heat-treated, make cast(ing) surface increase by one layer of ceramic hardened layer, improve the case hardness of foundry goods.Adopt the casting method of the present invention, foundry goods is once-forming, any surface finish, size are accurate, few cutting or the purpose without cutting can be reached, and surface has ceramic hardened layer, hardness is greatly improved, and therefore process of this invention is particularly practical for preparing car engine cover etc. needs the alloy-steel casting of high surfaces hardness.
Description
The divisional application that the application is based on China's application (2012104057300) and proposes
Technical field
The present invention relates to a kind of casting method, specifically, relate to the casting method of a kind of car engine cover.
Background technology
Casting is one of main method of manufactured parts blank, it it is preparation method quite efficiently, part particularly with some brittle metal or alloy material, the processing method that foundry engieering is commonly used especially, its forming principle is: METAL HEATING PROCESS melted so that it is have mobility, is then poured in the effigurate casting mold die cavity of tool, under the effect of gravity or external force, it is full of die cavity, cools down and be frozen into foundry goods or part.
Traditional casting technique generally comprises following steps: a, shape according to product make the apperance of molding and core making；B, apperance is put in sandbox, carry out mould assembling after back-up sand, consolidation, molding；C, by fusing after liquid metal be poured in the die cavity in sandbox；D, peeling foundry goods.
At present, traditional casting technique all needs substantial amounts of manpower when the preparation of molding sand, in the manufacturing process of sand mold and in the peeling foundry goods in later stage, and labor intensity is relatively big, wastes a large amount of valuable human resources, casting each product to be required for repeating above-mentioned operation, production efficiency is low simultaneously.
Based on drawbacks described above, the present invention is directed to the feature of car engine cover, it is provided that the casting method of the car engine cover of a kind of improvement.
Summary of the invention
It is an object of the invention to provide a kind of casting method that can be used for car engine cover.
Casting method of the present invention is the investment casting method improved, and model casting is also known as " lost-wax casting ".This method is that easy fusible pattern material is injected die mould (in mould), makes fusible pattern, it is assembled into module, is then coated with the liquid coating that application refractory material and binding agent are made on module surface, then spreads fire-resistant sand grains on coating, subsequently so as to shelling of hardening.So repeated multiple times, just form multilamellar shell.Shell is heated, makes fusible pattern be melted out, after housing is fired, toward wherein pouring into liquid alloy, after solidification, namely obtain foundry goods through operations such as cleanings.
Based on the requirement to car engine cover, i.e. good core toughness, torsional fatigue strength is high, case hardness is high, and wearability is good, the present invention using ceramic wear-resisting granule as refractory material, the liquid coating being made into binding agent is coated in module surface, make pattern, inject alloy liquid, along with the cooled and solidified of the alloy liquid injected forms foundry goods, ceramic wear-resisting granule is introduced cast(ing) surface, subsequently heat-treated, make cast(ing) surface increase by one layer of ceramic hardened layer, improve the case hardness of foundry goods.
Specifically, the casting method that invention is described, comprise the following steps:
1) the fusible model of preforming is immersed in the slurry of ceramic particle and colloidal liquid binder composition, described model is formed coating, dry；
2) to step 1) described coating on the slurry that constitutes of sprayable refractory granule or coating refractory material granule and colloidal liquid binder, dry；
3) molten mistake fusible pattern, Baking；
4) alloyage material, alloy material melting, cast；
5) cleaning: include shelling, remove the processing steps such as dead head, cleaning, inspection, soldering；
6) heat treating castings.
Step 1) and 2) in, described drying can be selected for method commonly used in the art, it is preferable that spray drying；
Step 3) adopt process conditions commonly used in the art to carry out, as 200-400 DEG C is incubated 1-3 hour；
Step 4) described in alloy can adopt the following low-alloy steel, composition (weight %) to be: C:0.55～1.24%；Si:0.2～0.35%；Mn:1.05～1.35%；Cr:1.50～1.80%；Ni:1.30～2.20%；Mo:0.20～0.45%；Cu:0.4～0.6%；Ti:0.05～0.08%, N≤0.015；All < 0.005%, O≤25ppm, all the other are Fe and inevitable impurity for S, P.
Adopting model casting, foundry goods is once-forming, and any surface finish, size are accurate, few cutting or the purpose without cutting can be reached, and surface has ceramic hardened layer, hardness is greatly improved, and being particularly suitable for preparing car engine cover etc. needs the alloy-steel casting of high surfaces hardness.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described further.As without specializing, the raw material used by the present invention is commercial.
Embodiment 1
According to following steps, cast car engine cover sample:
1) the fusible model of preforming is immersed in the slurry of ceramic particle and colloidal liquid binder composition, on described model, form coating, spray drying whereby；Described ceramic particle can be carborundum, silicon nitride or tungsten carbide, granule be sized to 20-50 μm；Described colloidal liquid binder is polyacrylamide；In the slurry that ceramic particle and colloidal liquid binder are constituted, the weight ratio of ceramic particle and colloidal liquid binder is 1:0.1；
Wherein, step 1) repeat 3 times；
2) to step 1) described coating on the slurry that constitutes of coating refractory material granule and colloidal liquid binder, spray drying；Wherein, described refractory material is silicon dioxide；The weight ratio that described fire resisting material particle forms material with gelling is 100:5；
Wherein, step 2) repeat 2 times；
3) 1 hour molten mistake fusible pattern of 200 DEG C of insulations, Baking；；
4) alloyage material, chemical composition is in Table 1, and alloy material utilizes vacuum induction melting, fusion temperature: 1580 DEG C, and pouring temperature is 1530 DEG C；
Table 1 chemical component table
5) cleaning: include shelling, remove the processing steps such as dead head, cleaning, inspection, soldering；
6) heat treating castings: 860 DEG C insulation 1 hour after oil quenching, 500 DEG C insulation 1 hour after furnace cooling.
Embodiment 2
According to following steps, cast car engine cover sample:
1) the fusible model of preforming is immersed in the slurry of ceramic particle and colloidal liquid binder composition, on described model, form coating, spray drying whereby；Described ceramic particle is silicon nitride and the mixture of tungsten carbide (weight ratio 10:1), granule be sized to 100-200 μm；Described colloidal liquid binder is polyacrylate；In the slurry that ceramic particle and colloidal liquid binder are constituted, the weight ratio of ceramic particle and colloidal liquid binder is 1:10；
Wherein, step 1) repeat 5 times；
2) to step 1) described coating on the slurry that constitutes of coating refractory material granule and colloidal liquid binder, spray drying；Wherein, described refractory material is magnesium oxide；The weight ratio that described fire resisting material particle forms material with gelling is 100:10；
Wherein, step 2) repeat 3 times；
3) 1 hour molten mistake fusible pattern of 400 DEG C of insulations, Baking；；
4) alloyage material, chemical composition is in Table 1, and alloy material utilizes vacuum induction melting, fusion temperature: 1620 DEG C, and pouring temperature is 1560 DEG C；
5) cleaning: include shelling, remove the processing steps such as dead head, cleaning, inspection, soldering；
6) heat treating castings.Step 6) heat treatment of medium casting can be carried out as follows: oil quenching after 900 DEG C of insulations 3 hours, furnace cooling after 600 DEG C of insulations 3 hours.
Embodiment 3
According to following steps, cast car engine cover sample:
1) the fusible model of preforming is immersed in the slurry of ceramic particle and colloidal liquid binder composition, on described model, form coating, spray drying whereby；Described ceramic particle is tungsten carbide, granule be sized to 50-100 μm；Described colloidal liquid binder is the mixture of polyacrylamide and polyacrylate；In the slurry that ceramic particle and colloidal liquid binder are constituted, the weight ratio of ceramic particle and colloidal liquid binder is 1:0.5；
Wherein, step 1) repeat 3 times；
2) to step 1) described coating on the slurry that constitutes of coating refractory material granule and colloidal liquid binder, spray drying；Wherein, described refractory material is aluminium oxide；The weight ratio that described fire resisting material particle forms material with gelling is 100:1；
Wherein, step 2) repeat 2 times；
3) 2 hours molten mistake fusible patterns of 300 DEG C of insulations, Baking；；
4) alloyage material, chemical composition is in Table 1, and alloy material utilizes vacuum induction melting, fusion temperature: 1600 DEG C, and pouring temperature is 1550 DEG C；
5) cleaning: include shelling, remove the processing steps such as dead head, cleaning, inspection, soldering；
6) heat treating castings: 880 DEG C insulation 2 hours after oil quenching, 550 DEG C insulation 1 hour after furnace cooling.
Embodiment 4
According to following steps, cast car engine cover sample:
1) the fusible model of preforming is immersed in the slurry of ceramic particle and colloidal liquid binder composition, on described model, form coating, spray drying whereby；Described ceramic particle is carborundum, granule be sized to 40-80 μm；Described colloidal liquid binder is polyacrylamide；In the slurry that ceramic particle and colloidal liquid binder are constituted, the weight ratio of ceramic particle and colloidal liquid binder is 1:0.3；
Wherein, step 1) repeat 3 times；
2) to step 1) described coating on sprayable refractory granule；Wherein, described refractory material is the mixture of silicon dioxide and aluminium oxide；
3) 2 hours molten mistake fusible patterns of 280 DEG C of insulations, Baking；
4) alloyage material, chemical composition is in Table 1, and alloy material utilizes vacuum induction melting, fusion temperature: 1620 DEG C, and pouring temperature is 1530 DEG C；
5) cleaning: include shelling, remove the processing steps such as dead head, cleaning, inspection, soldering；
6) heat treating castings: 900 DEG C insulation 1 hour after oil quenching, 500 DEG C insulation 1.5 hours after furnace cooling.
Car engine cover prepared by embodiment 1-4 diametrically samples, sample carries out torsional fatigue strength test, the reverse torsion machine adopting torque capacity to be 4900N m (=500kgf.m), alternation ground changes stress condition and carries out, reaching 1 × 105Stress during the secondary life-span is tried to achieve as fatigue strength.
It addition, to the sample made with the same terms, adopt thickness and the hardness of light microscope determining hardened layer.Result is in Table 2:
The test result of table 2 sample
The present invention adopts investment casting method, and foundry goods is once-forming, and any surface finish, size are accurate, few cutting or the purpose without cutting can be reached, and surface has ceramic hardened layer, hardness is greatly improved, and being particularly suitable for preparing car engine cover etc. needs the alloy-steel casting of high surfaces hardness.
Claims (1)
1. the casting method of a car engine cover, it is characterised in that comprise the following steps:
1) the fusible model of preforming is immersed in the slurry of ceramic particle and colloidal liquid binder composition, on described model, form coating whereby, dry；
2) to step 1) described coating on the slurry that constitutes of sprayable refractory granule or coating refractory material granule and colloidal liquid binder, dry；
3) molten mistake fusible pattern, Baking；
4) alloyage material, alloy material melting, cast；
5) cleaning: include shelling, remove the processing steps such as dead head, cleaning, inspection, soldering；
6) heat treating castings；
Described alloy is the low-alloy steel containing following weight percent composition: C:0.55～1.24%；Si:0.2～0.35%；Mn:1.05～1.35%；Cr:1.50～1.80%；Ni:1.30～2.20%；Mo:0.20～0.45%；Cu:0.4～0.6%；Ti:0.05～0.08%, N≤0.015；All < 0.005%, O≤25ppm, all the other are Fe and inevitable impurity for S, P.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410515784.1A CN104259390B (en) | 2012-10-22 | 2012-10-22 | A kind of casting method of car engine cover |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410515784.1A CN104259390B (en) | 2012-10-22 | 2012-10-22 | A kind of casting method of car engine cover |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210405730.0A Division CN102861873B (en) | 2012-10-22 | 2012-10-22 | Casting method of gear |
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| CN104259390A CN104259390A (en) | 2015-01-07 |
| CN104259390B true CN104259390B (en) | 2016-07-06 |
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| CN106756552A (en) * | 2016-12-15 | 2017-05-31 | 苏州陈恒织造有限公司 | A kind of production technology of wear-resistant gear |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06320233A (en) * | 1993-05-12 | 1994-11-22 | Nippon Steel Corp | Production of double layer steel sheet having remarkably excellent corrosion resistance and boundary breakage resistance |
| CN1530192A (en) * | 2003-03-10 | 2004-09-22 | 中国科学院金属研究所 | Silicon carbide shell production and use in directional solidification |
| CN101289731A (en) * | 2008-05-09 | 2008-10-22 | 莱芜钢铁股份有限公司 | CrMnTi narrow hardenability strip pinion steels and method of manufacture |
| CN102000778A (en) * | 2009-09-02 | 2011-04-06 | 江苏圆通汽车零部件有限责任公司 | Method for casting aluminum alloy automobile engine bracket |
| CN102433513A (en) * | 2011-11-29 | 2012-05-02 | 杨学焦 | Preparation and heat treatment method of low-alloy heat-resistant high-strength steel memebers |
-
2012
- 2012-10-22 CN CN201410515784.1A patent/CN104259390B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06320233A (en) * | 1993-05-12 | 1994-11-22 | Nippon Steel Corp | Production of double layer steel sheet having remarkably excellent corrosion resistance and boundary breakage resistance |
| CN1530192A (en) * | 2003-03-10 | 2004-09-22 | 中国科学院金属研究所 | Silicon carbide shell production and use in directional solidification |
| CN101289731A (en) * | 2008-05-09 | 2008-10-22 | 莱芜钢铁股份有限公司 | CrMnTi narrow hardenability strip pinion steels and method of manufacture |
| CN102000778A (en) * | 2009-09-02 | 2011-04-06 | 江苏圆通汽车零部件有限责任公司 | Method for casting aluminum alloy automobile engine bracket |
| CN102433513A (en) * | 2011-11-29 | 2012-05-02 | 杨学焦 | Preparation and heat treatment method of low-alloy heat-resistant high-strength steel memebers |
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| CN104259390A (en) | 2015-01-07 |
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