CN108927492A - A kind of cast steel intermediate product of diesel engine manufacturing process - Google Patents
A kind of cast steel intermediate product of diesel engine manufacturing process Download PDFInfo
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- CN108927492A CN108927492A CN201810931588.0A CN201810931588A CN108927492A CN 108927492 A CN108927492 A CN 108927492A CN 201810931588 A CN201810931588 A CN 201810931588A CN 108927492 A CN108927492 A CN 108927492A
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- cast steel
- manufacturing process
- intermediate product
- processing
- diesel engine
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 55
- 229910001208 Crucible steel Inorganic materials 0.000 title claims abstract description 44
- 239000013067 intermediate product Substances 0.000 title claims abstract description 38
- 238000003801 milling Methods 0.000 claims abstract description 32
- 238000000227 grinding Methods 0.000 claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000002844 melting Methods 0.000 claims abstract description 15
- 230000008018 melting Effects 0.000 claims abstract description 15
- 229910052751 metal Inorganic materials 0.000 claims abstract description 14
- 239000002184 metal Substances 0.000 claims abstract description 14
- 239000003110 molding sand Substances 0.000 claims abstract description 12
- 238000005498 polishing Methods 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000005516 engineering process Methods 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims description 30
- 238000005266 casting Methods 0.000 claims description 17
- 238000004321 preservation Methods 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 10
- 238000005422 blasting Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 230000000630 rising effect Effects 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 238000009740 moulding (composite fabrication) Methods 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 230000003746 surface roughness Effects 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 239000000919 ceramic Substances 0.000 claims description 2
- 238000009845 electric arc furnace steelmaking Methods 0.000 claims description 2
- 238000007670 refining Methods 0.000 claims description 2
- 239000000047 product Substances 0.000 abstract description 7
- 230000000704 physical effect Effects 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Classifications
-
- 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
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D31/00—Cutting-off surplus material, e.g. gates; Cleaning and working on castings
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The present invention proposes a kind of cast steel intermediate product of diesel engine manufacturing process, comprising the following steps: mold manufacture, melting and pour, demould and knockout processing, finishing, surface polishing treatment, heat treatment, rough milling and corase grinding process and finish-milling process and fine grinding；The present invention proposes the physical property that cast steel intermediate product can be improved by heat treatment, improve the strength and stiffness of cast steel intermediate product, cast steel intermediate product is unlikely to deform, shrinkage stress and fire check will not be generated, manufacturing process of the present invention is compared with traditional cast steel intermediate product processing technology simultaneously, manufacturing process of the present invention does not use water largely, technical process is simply easily realized, effectively raise product quality, the trial-production period is shortened simultaneously, production cost is saved, molding sand and excess metal remaining on intermediate crude green body can be removed by being handled by knockout, product surface quality can be improved, guarantee that intermediate crude green body surface does not have flaw.
Description
Technical field
The present invention relates to diesel engine manufacturing field more particularly to a kind of cast steel intermediate product of diesel engine manufacturing process.
Background technique
Cast steel intermediate product of diesel engine is one of the critical component of marine low-speed high-power diesel engine.Existing diesel engine cast steel
In the manufacturing process of intermediate, intermediate casting is easy to produce biggish shrinkage stress in process of setting, is easy to produce hot tearing
The manufacturing process of line, some cast steel intermediate product of diesel engine is subtracted using control pouring molten steel temperature and raising sand mold entirety deformability
Small shrinkage stress reduces the generation of crackle, but since the solidification of the heat energy-saving position of intermediate casting is later, casting intermediate still holds
Easily there is shrinkage cavity and shrinkage porosite, forms formation of crack, while having used a large amount of resource to set in the manufacturing process of some cast steel intermediate products
It is standby, high production cost, inadequate environmental protection and economy.Therefore, the present invention proposes a kind of cast steel intermediate product of diesel engine manufacturing process to solve
Shortcoming in the prior art.
Summary of the invention
In view of the above-mentioned problems, the present invention proposes the physical property that cast steel intermediate product can be improved by heat treatment, improve
The strength and stiffness of cast steel intermediate product, cast steel intermediate product are unlikely to deform, and will not generate shrinkage stress and fire check, while the present invention
For manufacturing process compared with traditional cast steel intermediate product processing technology, manufacturing process of the present invention does not use water, technical process largely
It is simple easily to realize, product quality is effectively raised, while shortening the trial-production period, has saved production cost.
The present invention proposes a kind of cast steel intermediate product of diesel engine manufacturing process, comprising the following steps:
Step 1: mold manufacture
The cast steel intermediate product design drawing drawn out according to computer software, further according to design drawing manufacture core box, molding sand and sand core, then
Core box, molding sand and sand core are assembled, mold is made；
Step 2: it melting and pours
Cast steel material is subjected to melting processing, metal liquid is made, then metal liquid is cast in mold and carries out casting and forming,
Cooling treatment is carried out after casting and forming；
Step 3: demoulding and knockout processing
Mold after cooling treatment is subjected to demoulding processing, obtains intermediate crude green body, then intermediate crude green body is subjected to knockout processing；
Step 4: finishing
Remaining riser, running channel and extra molding sand on knockout treated intermediate crude green body are subjected to finishing removal, guaranteed intermediate
Body crude green body any surface finish free from admixture, is made intermediate blank；
Step 5: surface polishing treatment
The surface of intermediate blank is processed by shot blasting；
Step 6: heat treatment
Intermediate blank after polishing treatment is heated, is kept the temperature again after heating, cooling treatment is carried out after heat preservation, it is cooling
It carries out rise again heating and secondary isothermal holding again afterwards, carries out cooling down after secondary isothermal holding；
Step 7: rough milling and corase grinding processing
Intermediate blank after heat treatment is subjected to rough milling, then the intermediate blank after rough milling is subjected to corase grinding and is added
Work；
Step 8: finish-milling processing and fine grinding
Intermediate blank after corase grinding processing is subjected to finish-milling processing, then the intermediate blank after retrofit is subjected to fine grinding and is added
Work.
Further improvement lies in that: computer software is one of CAD, CAE or CAM technology in the step 1.
Further improvement lies in that: melting processing is using in electric-arc furnace steelmaking or ladle refining furnace in the step 2
One kind, melting treatment temperature is 1580-1600 degrees Celsius in the step 2, and it is 40-50 minutes that melting, which handles the time, the step
Casting and forming temperature is 1500-1600 degrees Celsius in rapid two, and the casting and forming time is 1.2-1.5 hours, and the cooling treatment is
Cooling by water, cooling by water temperature are 400-450 degrees Celsius.
Further improvement lies in that: in pouring in the step 2, first slowly metal liquid is poured into mold and is poured
Note 20 minutes, then Quick pouring 20 minutes, were slowly poured 10 minutes again after metal liquid reaches upper riser.
Further improvement lies in that: the mold after cooling treatment is first subjected to demoulding processing in the step 3, obtains centre
Body crude green body, then by demoulding, treated the heat preservation of intermediate crude green body 40-60 hours, and intermediate crude green body is put into inertia knockout after heat preservation
Machine carries out knockout processing, and knockout treatment temperature is 300-320 degrees Celsius.
Further improvement lies in that: polishing treatment carries out Shot Blasting using impeller head in the step 5, at the ball blast
Managing the ball blast material used is one of shot, aluminum shot, ceramic or steel sand.
Further improvement lies in that: it first carries out the intermediate blank after polishing treatment to be heated to 600- in the step 6
650 degrees Celsius, heat preservation 5-6 hours is carried out after heating again, cooling treatment is carried out after heat preservation, is cooled to 280-300 degrees Celsius, cooling
It carries out rising again again after processing being heated to 450 degrees Celsius, carries out secondary isothermal holding 3-4 hours after heating of rising again, secondary heat preservation
Cooling down is carried out after processing to 220-250 degrees Celsius.
Further improvement lies in that: according to a kind of cast steel intermediate product of diesel engine manufacturing process described in claim 1, feature exists
In: in the step 7 end face of the intermediate blank after heat treatment is first subjected to rough milling, then to process
End face processes the end face of remaining intermediate blank as positioning datum, and rough milling is after the completion with the intermediate after rough milling
The bottom surface of blank and perpendicular to bottom surface a plane as positioning datum, corase grinding processing is carried out to the end face of intermediate blank.
Further improvement lies in that: the finish-milling processing in the rough milling and the step 8 in the step 7 is all made of number
Control milling machine is processed, and the corase grinding processing in the step 7 and the fine grinding in step 8 are all made of numerically control grinder and are added
Work.
Further improvement lies in that: the intermediate blank surface roughness in the step 8 after fine grinding is 0.3-0.4
Micron.
The invention has the benefit that the physical property of cast steel intermediate product can be improved by heat treatment, cast steel is improved
The strength and stiffness of intermediate, cast steel intermediate product are unlikely to deform, and will not generate shrinkage stress and fire check, while the present invention manufactures
For technique compared with traditional cast steel intermediate product processing technology, manufacturing process of the present invention does not use water largely, and technical process is simple
It easily realizes, effectively raises product quality, while shortening the trial-production period, saved production cost, being handled by knockout can
To remove molding sand and excess metal remaining on intermediate crude green body, product surface quality can be improved, guarantee intermediate crude green body table
Face does not have flaw, and prediction test die can be carried out by drawing mold design figure by computer software, can be right before manufacture production
Manufacturing process carries out simplation examination, improves the manufacture efficiency of later period manufacture, improves the integrity of technique.
Detailed description of the invention
Fig. 1 is process flow chart of the invention.
Specific embodiment
In order to realize invention technological means, reach purpose and effect is easy to understand, below with reference to specific implementation
Mode, the present invention is further explained.
A kind of cast steel intermediate product of diesel engine manufacturing process, comprising the following steps:
Step 1: mold manufacture
According to the cast steel intermediate product design drawing drawn out in CAM technology, further according to design drawing manufacture core box, molding sand and sand core, then
Core box, molding sand and sand core are assembled, mold is made；
Step 2: it melting and pours
Electric arc furnaces is added in cast steel material and carries out melting processing, metal liquid is made, then metal liquid is slowly poured into mold
Interior casting 20 minutes, then Quick pouring 20 minutes, slowly carry out for casting 10 minutes again after metal liquid reaches upper riser
Casting and forming carries out cooling by water after casting and forming, and melting treatment temperature is 1600 degrees Celsius, and it is 45 points that melting, which handles the time,
Clock, casting and forming temperature are 1550 degrees Celsius, and the casting and forming time is 1.4 hours, and cooling by water temperature is 450 degrees Celsius；
Step 3: demoulding and knockout processing
Mold after cooling treatment is subjected to demoulding processing, obtains intermediate crude green body, then will demoulding treated intermediate crude green body
Intermediate crude green body is put into inertia knock-out grid after heat preservation and carries out knockout processing by heat preservation 50 hours, and knockout treatment temperature is 300 Celsius
Degree；
Step 4: finishing
Remaining riser, running channel and extra molding sand on knockout treated intermediate crude green body are subjected to finishing removal, guaranteed intermediate
Body crude green body any surface finish free from admixture, is made intermediate blank；
Step 5: surface polishing treatment
Intermediate blank is put into the Shot Blasting that impeller head carries out intermediate blank surface, the ball blast material that Shot Blasting uses
For shot；
Step 6: heat treatment
It first carries out the intermediate blank after polishing treatment to be heated to 620 degrees Celsius, carries out heat preservation 5 hours, heat preservation after heating again
After carry out cooling treatment, be cooled to 285 degrees Celsius, carry out rising again again after cooling treatment being heated to 450 degrees Celsius, heating of rising again
After carry out secondary isothermal holding 4 hours, after secondary isothermal holding carry out cooling down to 230 degrees Celsius；
Step 7: rough milling and corase grinding processing
First the intermediate blank after heat treatment is carried out using the end face that CNC milling machine carries out intermediate blank in step 7
Rough milling, then processes the end face of remaining intermediate blank using the end face that processes as positioning datum, and rough milling is complete
After using the bottom surface of the intermediate blank after rough milling and perpendicular to bottom surface a plane as positioning datum, by intermediate
Blank clamping carries out corase grinding processing to the end face of intermediate blank on numerically control grinder；
Step 8: finish-milling processing and fine grinding
Intermediate blank clamping after corase grinding processing is subjected to finish-milling processing on CNC milling machine, then by the centre after retrofit
Chaeta base clamping carries out fine grinding on numerically control grinder, and the intermediate blank surface roughness after guaranteeing fine grinding is 0.3
Micron.
The physical property that cast steel intermediate product can be improved by being heat-treated, improves the strength and stiffness of cast steel intermediate product,
Cast steel intermediate product is unlikely to deform, and will not generate shrinkage stress and fire check, while in manufacturing process of the present invention and traditional cast steel
Between body processing technology compare, manufacturing process of the present invention not largely use water, technical process is simply easily realized, is effectively raised
Product quality, while the trial-production period is shortened, production cost has been saved, can have been removed by knockout processing residual on intermediate crude green body
Product surface quality can be improved in the molding sand and excess metal deposited, and guarantees that intermediate crude green body surface does not have flaw, passes through computer
Software on Drawing mold design figure can carry out prediction test die, can carry out simplation examination to manufacturing process before manufacture production,
The manufacture efficiency for improving later period manufacture, improves the integrity of technique.
The basic principles, main features and advantages of the invention have been shown and described above.The technical staff of the industry should
Understand, the present invention is not limited to the above embodiments, and the above embodiments and description only describe originals of the invention
Reason, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes and improvements
It all fall within the protetion scope of the claimed invention.The claimed scope of the invention is by appended claims and its equivalent circle
It is fixed.
Claims (10)
1. a kind of cast steel intermediate product of diesel engine manufacturing process, it is characterised in that: the following steps are included:
Step 1: mold manufacture
The cast steel intermediate product design drawing drawn out according to computer software, further according to design drawing manufacture core box, molding sand and sand core, then
Core box, molding sand and sand core are assembled, mold is made；
Step 2: it melting and pours
Cast steel material is subjected to melting processing, metal liquid is made, then metal liquid is cast in mold and carries out casting and forming,
Cooling treatment is carried out after casting and forming；
Step 3: demoulding and knockout processing
Mold after cooling treatment is subjected to demoulding processing, obtains intermediate crude green body, then intermediate crude green body is subjected to knockout processing；
Step 4: finishing
Remaining riser, running channel and extra molding sand on knockout treated intermediate crude green body are subjected to finishing removal, guaranteed intermediate
Body crude green body any surface finish free from admixture, is made intermediate blank；
Step 5: surface polishing treatment
The surface of intermediate blank is processed by shot blasting；
Step 6: heat treatment
Intermediate blank after polishing treatment is heated, is kept the temperature again after heating, cooling treatment is carried out after heat preservation, it is cooling
It carries out rise again heating and secondary isothermal holding again afterwards, carries out cooling down after secondary isothermal holding；
Step 7: rough milling and corase grinding processing
Intermediate blank after heat treatment is subjected to rough milling, then the intermediate blank after rough milling is subjected to corase grinding and is added
Work；
Step 8: finish-milling processing and fine grinding
Intermediate blank after corase grinding processing is subjected to finish-milling processing, then the intermediate blank after retrofit is subjected to fine grinding and is added
Work.
2. a kind of cast steel intermediate product of diesel engine manufacturing process according to claim 1, it is characterised in that: in the step 1
Computer software is one of CAD, CAE or CAM technology.
3. a kind of cast steel intermediate product of diesel engine manufacturing process according to claim 1, it is characterised in that: in the step 2
Melting processing is using one of electric-arc furnace steelmaking or ladle refining furnace, and melting treatment temperature is in the step 2
1580-1600 degrees Celsius, the melting processing time is 40-50 minutes, and casting and forming temperature is taken the photograph in the step 2 for 1500-1600
Family name's degree, casting and forming time are 1.2-1.5 hours, and the cooling treatment is cooling by water, and cooling by water temperature is taken the photograph for 400-450
Family name's degree.
4. a kind of cast steel intermediate product of diesel engine manufacturing process according to claim 1, it is characterised in that: in the step 2
In pour, first slowly metal liquid is poured into mold and is poured 20 minutes, then Quick pouring 20 minutes, work as molten metal
Body is slowly poured 10 minutes again after reaching upper riser.
5. a kind of cast steel intermediate product of diesel engine manufacturing process according to claim 1, it is characterised in that: in the step 3
The mold after cooling treatment is first subjected to demoulding processing, obtains intermediate crude green body, then will demoulding treated that intermediate crude green body is protected
It is 40-60 hours warm, intermediate crude green body is put into inertia knock-out grid after heat preservation and carries out knockout processing, knockout treatment temperature is 300-
320 degrees Celsius.
6. a kind of cast steel intermediate product of diesel engine manufacturing process according to claim 1, it is characterised in that: in the step 5
Polishing treatment carries out Shot Blasting using impeller head, and the ball blast material that the Shot Blasting uses is shot, aluminum shot, ceramic
Or one of steel sand.
7. a kind of cast steel intermediate product of diesel engine manufacturing process according to claim 1, it is characterised in that: in the step 6
It first carries out the intermediate blank after polishing treatment to be heated to 600-650 degrees Celsius, carries out heat preservation 5-6 hours after heating again, protect
Cooling treatment is carried out after temperature, is cooled to 280-300 degrees Celsius, carries out rising again again after cooling treatment being heated to 450 degrees Celsius, is returned
It is carried out secondary isothermal holding 3-4 hours after temperature heating, cooling down is carried out after secondary isothermal holding to 220-250 degrees Celsius.
8. a kind of cast steel intermediate product of diesel engine manufacturing process according to claim 1, it is characterised in that: in the step 7
An end face of the intermediate blank after heat treatment is first subjected to rough milling, then using the end face that processes as positioning datum
The end face of remaining intermediate blank is processed, with the bottom surface of the intermediate blank after rough milling and vertical after the completion of rough milling
In bottom surface a plane as positioning datum, corase grinding processing is carried out to the end face of intermediate blank.
9. a kind of cast steel intermediate product of diesel engine manufacturing process according to claim 1, it is characterised in that: in the step 7
Rough milling and the step 8 in finish-milling processing be all made of CNC milling machine and processed, the corase grinding in the step 7 adds
Fine grinding in work and step 8 is all made of numerically control grinder and is processed.
10. a kind of cast steel intermediate product of diesel engine manufacturing process according to claim 1, it is characterised in that: the step 8
Intermediate blank surface roughness after middle fine grinding is 0.3-0.4 microns.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810931588.0A CN108927492A (en) | 2018-08-16 | 2018-08-16 | A kind of cast steel intermediate product of diesel engine manufacturing process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810931588.0A CN108927492A (en) | 2018-08-16 | 2018-08-16 | A kind of cast steel intermediate product of diesel engine manufacturing process |
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Family
ID=64445493
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Cited By (4)
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| CN110408750A (en) * | 2019-07-24 | 2019-11-05 | 南通灵顿机械有限公司 | A kind of turbocharger middle body surface de-stress processing method |
| CN113969342A (en) * | 2021-10-29 | 2022-01-25 | 浙江红马铸造有限公司 | Machining process of casting part |
| CN114799748A (en) * | 2022-04-22 | 2022-07-29 | 河南省合亨矿山机械有限公司 | Production process of anchorage device product |
| CN115519324A (en) * | 2022-11-03 | 2022-12-27 | 苏州耀玮彤机械有限公司 | Surface precision milling method for special-shaped hardware parts of automobile |
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| CN115519324A (en) * | 2022-11-03 | 2022-12-27 | 苏州耀玮彤机械有限公司 | Surface precision milling method for special-shaped hardware parts of automobile |
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