CN106312478B - A kind of ship gear-box - Google Patents
A kind of ship gear-box Download PDFInfo
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- CN106312478B CN106312478B CN201610892211.XA CN201610892211A CN106312478B CN 106312478 B CN106312478 B CN 106312478B CN 201610892211 A CN201610892211 A CN 201610892211A CN 106312478 B CN106312478 B CN 106312478B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/14—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass gear parts, e.g. gear wheels
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Abstract
The invention discloses a kind of ship gear-box, which includes following components：C, Si, Mn, Fe, Mg, Zn, Mn, Cr, Ti, Ni, Nb, V, Cu, P, S, rare earth, surplus Al；Gear-box high intensity, the hardness of the present invention, wearability, corrosion resistance and oxidation resistance are good, and yield strength and tensile strength are high and its processing method is simple, at low cost, good moldability.
Description
Technical field
The present invention relates to a kind of gear-boxes, and in particular to a kind of ship gear-box.
Background technology
In order to promote civilian China, ships used for military purposes design, the level of aggregation manufactured, national correlation department propped up energetically in recent years
The design and production of ship and its crucial auxiliary equipment are held, the development in ship key auxiliary equipment market is greatly facilitated, nevertheless,
The ship that China uses at present is still to be introduced from foreign countries the 1960s and 1970s with gear box technology, independent research and development capacity
It is weaker, there is a certain distance with advanced international standard, the complement rate of ship gear-box is non-in China's Ship production
Often low, especially gear box for high-power ship still relies primarily on import so far, the serious phenomenon of " machines such as ship " often occurs；
Marine gearbox is one of deceleration mechanism and propulsion system of various ship indispensabilities, and comprehensive quality is directly related to
The overall performance of ship, marine gearbox must be reduced weight as far as possible, improved while long-life and high reliability is met
Shock resistance etc., a kind of ship that can overcome drawbacks described above of research and development are urgently to be resolved hurrily as those skilled in the art with gear-box
Technical problem.
Invention content
The technical problems to be solved by the invention are, for above shortcoming of the existing technology, to propose that a kind of ship is used
Gear-box, gear-box high intensity, the hardness, wearability, corrosion resistance and oxidation resistance are good, yield strength and tensile strength it is high and
Its processing method is simple, at low cost, good moldability.
The present invention solve more than technical problem technical solution be：
A kind of ship gear-box, the gear case body include following components by mass percentage：C：0.20-0.23%,
Si：3-5%, Fe：0.6-0.8%, Mg：5-7%, Zn：0.5-0.8%, Mn：0.1-0.3%, Cr：0.4-0.6%, Ti：0.08-
0.13%, Ni：0.8-1.0%, Nb：0.02-0.04%, V：0.01-0.03%, Cu≤0.2%, P≤0.03%, S≤0.02%, rare earth：
0.01-0.04%, surplus Al；
Chemical composition is the component of rare earth by mass percentage：La：18-23%, Sc：11-13%, Y：15-17%, Sm：20-
22%；Nd：18-21%, Ce：5-8%, Gd：The sum of 8-12%, the above components is 100%；
The ship is prepared according to the following steps with gear case body：
（1）Ship gear case body mold is made as Modeling Material using molding sand and core sand, before casting mold is made, first to making
Molding sand in section bar material, which is placed in baker, is dried；
（2）Each ingredient of ship gear case body is heated into melting, obtains material liquid after all melting, temperature rises to
Then 650-720 DEG C of heat preservation 20-30min rises to 750-780 DEG C, and carries out essence using pure argon gas using rotary getter
Degasification is refined, the alterant for adding in the mixing of Al-10Sr and Na salt after degasification into material liquid carries out Metamorphism treatment；
（3）By the material liquid injection step after Metamorphism treatment（1）In in molding mold, mold both sides setting sprue and
The ingate of dispersion is first poured into a mould on one side during cast, and when material liquid is about covered with mold half, both sides are injected simultaneously, are realized under
Consecutive solidification on and since casting is big, can shorten material liquid filling time, reduce flow, open sprue and dispersion in this way
Ingate mitigates hot-spot phenomenon, is then demoulded after air-cooled and ship gear case body blank is made；
（4）For step（3）In ship heated at 300-350 DEG C with gear case body blank, then with 20-26
DEG C/speed of h keeps the temperature 1.5-2h when being cooled to 175 DEG C, then it is air-cooled to room temperature；
（5）Ship is carried out with gear case body blank at strengthened shot peening；
（6）Tank body blank is placed into processing tooth socket on roughing tooth groove machine tool and carries out coarse milling tooth form process；
（7）By step（6）In ship heated at 320-370 DEG C with gear case body blank, then with 15-20 DEG C/
The speed of h keeps the temperature 1-2h when being cooled to 205 DEG C, be then air-cooled to room temperature；
（8）The ship that will be cooled to room temperature is heated to 150-190 DEG C with gear case body blank, then carries out at carburizing
Reason, the Carburization Treatment, less than in the environment of the oxygen concentration in air, ship are added with gear case body blank in oxygen concentration
Heat to surface forms carburized layer；
（9）Nitrizing Treatment is carried out with gear case body blank to the ship after carburizing, by ship gear case body blank
It send into closed container and is passed through nitrogen, first will warm up 280-330 DEG C of holding 1h, be then heated to 410 DEG C of heat preservation 5-7h, most
After be heated to 540 DEG C heat preservation 1.5-2h, be then furnace-cooled to 180 DEG C and be air-cooled to room temperature again；
（10）To step（9）In ship carry out Tempering and Quenching with gear case body blank, Tempering and Quenching will be passed through
Ship afterwards is placed on lathe with gear case body blank and carries out finish turning process, and carries out finish-milling and cut tooth form process obtaining ship
Oceangoing ship gear case body finished product；
（11）X-ray inspection is carried out to obtained finished product, examines qualified packaging and storage.
In the component of middle case of the present invention, added with Si, it can improve the casting character of alloy, and silicon can form solid with aluminium
Solution, silicon form eutectic with aluminium, improve the high temperatures of alloy, reduce shrinking percentage, no hot cracking tendency；Cu can improve the stream of alloy
Dynamic property, tensile strength and hardness；Mg can improve intensity and yield limit, improve the machinability of alloy, exist containing magnesium --- --
When with excellent corrosion resistance；Zn can improve mobility in the alloy, increase red brittleness, but can reduce corrosion resistance, will
Zn controls exist --- and corrosion resistance can be strictly controlled, while there is good casting character and mechanical performance, machining also compares
Preferably；Fe is the harmful element in alloy, and the sheet or acicular structure of Al-Si-Fe are present in alloy, it can reduce machinery
Performance so that the mobility of alloy lowers, hot crackability increase, but alloy is very strong to the adhesive attraction of mold, when Fe contains
Particularly strong when amount is below 0.6%, after more than 0.6%, mold sticking just considerably reduces, therefore Fe is strict controlled in by the present invention
0.6-0.8% is beneficial to die casting；Mn can reduce the adverse effect of iron in the alloy so that the sheet that is formed in alloy by iron and
Acicular structure becomes fine and closely woven texture, stringent to control Mn ranging from ----because excessively high Mn contents can cause segregation；
Ni can improve the intensity and hardness of alloy in the alloy, and Ni is as the effect of iron, the stringent advantageous casting warp of content for controlling Ni
Bright and clean surface can be obtained after polishing；Add in --- Ti can notable refining aluminum alloy grain structure, improve the mechanicalness of alloy
Can, low-alloyed hot cracking tendency drops.
The technical solution that further limits of the present invention as：
In aforementioned ship gear-box, step（10）The Tempering and Quenching of middle progress, the concrete operations of Tempering and Quenching are：
It is combined using normalizing and tempering, a normalizing+double tempering, first time temperature is more than second of temperature；Normalizing：
450 DEG C of normalizing temperature, to temperature after keep the temperature 10min；It is tempered for the first time：Using heat stepwise, first segment heating temperature is 240 DEG C,
Keep the temperature 15min after to temperature, second segment heating temperature is 450 DEG C, to temperature after keep the temperature 9min, carry out second after being then air-cooled to room temperature
Secondary tempering；Be heated to 540 DEG C, to temperature after keep the temperature 15min.
In aforementioned ship gear-box, which includes following components by mass percentage：C：0.20%, Si：
3%, Fe：0.6%, Mg：5%, Zn：0.5%, Mn：0.1%, Cr：0.4%, Ti：0.08%, Ni：0.8%, Nb：0.02%, V：0.01%,
Cu≤0.2%, P≤0.03%, S≤0.02%, rare earth：0.01%, surplus Al；
Chemical composition is the component of rare earth by mass percentage：La：18%, Sc：12%, Y：15%, Sm：21%；Nd：18%,
Ce：5%, Gd：11%, the sum of the above components are 100%.
In aforementioned ship gear-box, which includes following components by mass percentage：C：0.23%, Si：
5%, Fe：0.8%, Mg：7%, Zn：0.8%, Mn：0.3%, Cr：0.6%, Ti：0.13%, Ni：1.0%, Nb：0.04%, V：0.03%,
Cu≤0.2%, P≤0.03%, S≤0.02%, rare earth：0.04%, surplus Al；
Chemical composition is the component of rare earth by mass percentage：La：22%, Sc：11%, Y：15%, Sm：20%；Nd：18%,
Ce：6%, Gd：8%, the sum of the above components are 100%.
In aforementioned ship gear-box, which includes following components by mass percentage：C：0.21%, Si：
4%, Fe：0.7%, Mg：6%, Zn：0.6%, Mn：0.2%, Cr：0.5%, Ti：0.09%, Ni：0.9%, Nb：0.03%, V：0.02%,
Cu≤0.2%, P≤0.03%, S≤0.02%, rare earth：0.03%, surplus Al；
Chemical composition is the component of rare earth by mass percentage：La：19%, Sc：13%, Y：16%, Sm：20%；Nd：18%,
Ce：5%, Gd：9%, the sum of the above components are 100%.
The beneficial effects of the invention are as follows：
Without adding a large amount of alloy in the composition of the babinet, cost, selective addition trace alloying element are reduced
Cr, Nb and V；The addition of Cr is mainly the increase in quenching degree, significantly improves intensity, hardness and wearability, also increases preparation
The corrosion resistance and oxidation resistance of the babinet gone out；
The affinity of Nb and C is bigger, and Nb is combined prior to C after adding in and generated niobium carbide（NbC）, it effectively prevent intergranular rotten
Erosion；
The addition of Nb, V have advantage a, the raising of heating temperature and the extension of soaking time in melting, austenite crystal
Carbon is formed when grain is increasing, the little particle of nitride diffusion plays austenite grain boundary fixed function, prevention austenite crystal grain length
Greatly, the Coarsening Temperature of babinet is improved；B, when temperature continuously decreases during production carries out, the carbon of Nb, V, nitride are in austenite
Solubility product reduce, the effect of deformation-induced precipitation in addition, carbon, nitride austenite before ferritic transformation disperse analyse
Go out, become ferritic nucleating agent, ferrite is made largely to be formed under smaller degree of supercooling, be not easy to grow up, so as to refine iron
Ferritic crystal grain improves yield strength and tensile strength.
Be added to lanthanide rare in babinet of the present invention, due to more than rare earth element metallic atomic radius than iron atom half
Diameter is big, it is easy to fill up in its crystal grain and defect, and generate the film that can hinder crystal grain continued growth, so as to making crystal grain refinement and
Performance is improved, meanwhile, rare earth element is easily and oxygen, sulphur, lead and other elements chemical combination generate the high compound of fusing point, can play purification
Effect.
Blank carries out modifier treatment again after coarse milling tooth form, and the overall mechanical properties that can improve blank control heat treatment
Deflection can improve the processing efficiency and processing quality of blank, using double annealing, effectively go de-stress.
It is handled using strengthened shot peening, improves fatigue strength, particularly improve the bending of the gap regions of case-hardening component
Fatigue strength and torsional fatigue strength；Can also surface vibration abrasion and fretting corrosion, improve tear strength；Improve for stress
The corrosion resistance of crevice corrosion and vibration crevice corrosion.
The present invention is also added into the alterant of Al-10Sr and Na salt mixing, and the scheme not gone bad individually using Sr is used
The elongation highest that the alterant of mixing goes bad, tensile strength is preferable, and the independent Metamorphism treatments of mechanical property Sr are compared and greatly improved.
Specific embodiment
Embodiment 1
The present embodiment provides a kind of ship gear-box, which includes following components by mass percentage：
C：0.20%, Si：3%, Fe：0.6%, Mg：5%, Zn：0.5%, Mn：0.1%, Cr：0.4%, Ti：0.08%, Ni：0.8%, Nb：
0.02%, V：0.01%, Cu≤0.2%, P≤0.03%, S≤0.02%, rare earth：0.01%, surplus Al；
Chemical composition is the component of rare earth by mass percentage：La：18%, Sc：12%, Y：15%, Sm：21%；Nd：18%,
Ce：5%, Gd：11%, the sum of the above components are 100%；
Ship is prepared according to the following steps with gear case body：
（1）Ship gear case body mold is made as Modeling Material using molding sand and core sand, before casting mold is made, first to making
Molding sand in section bar material, which is placed in baker, is dried；
（2）Each ingredient of ship gear case body is heated into melting, obtains material liquid after all melting, temperature rises to
Then 650 DEG C of heat preservation 20min rise to 750 DEG C, and carry out refining degasification, degasification using pure argon gas using rotary getter
The alterant that the mixing of Al-10Sr and Na salt is added in backward material liquid carries out Metamorphism treatment；
（3）By the material liquid injection step after Metamorphism treatment（1）In in molding mold, mold both sides setting sprue and
The ingate of dispersion is first poured into a mould on one side during cast, and when material liquid is about covered with mold half, both sides are injected simultaneously, then through sky
Ship gear case body blank is made in demoulding after cold；
（4）For step（3）In ship heated at 300 DEG C with gear case body blank, then with the speed of 20 DEG C/h
Degree keeps the temperature 1.5h when being cooled to 175 DEG C, is then air-cooled to room temperature；
（5）Ship is carried out with gear case body blank at strengthened shot peening；
（6）Tank body blank is placed into processing tooth socket on roughing tooth groove machine tool and carries out coarse milling tooth form process；
（7）By step（6）In ship heated at 320 DEG C with gear case body blank, then with the speed of 15 DEG C/h
1h is kept the temperature when being cooled to 205 DEG C, is then air-cooled to room temperature；
（8）The ship that will be cooled to room temperature is heated to 150 DEG C with gear case body blank, then carries out Carburization Treatment, should
Carburization Treatment less than in the environment of the oxygen concentration in air, carries out with gear case body blank ship to be heated to table in oxygen concentration
Face forms carburized layer；
（9）Nitrizing Treatment is carried out with gear case body blank to the ship after carburizing, by ship gear case body blank
It send into closed container and is passed through nitrogen, first will warm up 280 DEG C of holding 1h, be then heated to 410 DEG C and keep the temperature 5h, it is finally heated
To 540 DEG C of heat preservation 1.5h, then it is furnace-cooled to 180 DEG C and is air-cooled to room temperature again；
（10）To step（9）In ship carry out Tempering and Quenching with gear case body blank, Tempering and Quenching will be passed through
Ship afterwards is placed on lathe with gear case body blank and carries out finish turning process, and carries out finish-milling and cut tooth form process obtaining ship
Oceangoing ship gear case body finished product；
The concrete operations of Tempering and Quenching are：It is combined using normalizing and tempering, a normalizing+double tempering, for the first time
Temperature is more than second of temperature；Normalizing：450 DEG C of normalizing temperature, to temperature after keep the temperature 10min；It is tempered for the first time：Using
Heat stepwise, first segment heating temperature are 240 DEG C, to temperature after keep the temperature 15min, second segment heating temperature is 450 DEG C, to Wen Houbao
Warm 9min carries out second of tempering after being then air-cooled to room temperature；Be heated to 540 DEG C, to temperature after keep the temperature 15min；
（11）X-ray inspection is carried out to obtained finished product, examines qualified packaging and storage.
Embodiment 2
The present embodiment provides a kind of ship gear-box, C：0.23%, Si：5%, Fe：0.8%, Mg：7%, Zn：0.8%, Mn：
0.3%, Cr：0.6%, Ti：0.13%, Ni：1.0%, Nb：0.04%, V：0.03%, Cu≤0.2%, P≤0.03%, S≤0.02% are dilute
Soil：0.04%, surplus Al；
Chemical composition is the component of rare earth by mass percentage：La：22%, Sc：11%, Y：15%, Sm：20%；Nd：18%,
Ce：6%, Gd：8%, the sum of the above components are 100%；
Ship is prepared according to the following steps with gear case body：
（1）Ship gear case body mold is made as Modeling Material using molding sand and core sand, before casting mold is made, first to making
Molding sand in section bar material, which is placed in baker, is dried；
（2）Each ingredient of ship gear case body is heated into melting, obtains material liquid after all melting, temperature rises to
Then 720 DEG C of heat preservation 230min rise to 780 DEG C, and carry out refining degasification, degasification using pure argon gas using rotary getter
The alterant that the mixing of Al-10Sr and Na salt is added in backward material liquid carries out Metamorphism treatment；
（3）By the material liquid injection step after Metamorphism treatment（1）In in molding mold, mold both sides setting sprue and
The ingate of dispersion is first poured into a mould on one side during cast, and when material liquid is about covered with mold half, both sides are injected simultaneously, then through sky
Ship gear case body blank is made in demoulding after cold；
（4）For step（3）In ship heated at 350 DEG C with gear case body blank, then with the speed of 26 DEG C/h
Degree keeps the temperature 2h when being cooled to 175 DEG C, is then air-cooled to room temperature；
（5）Ship is carried out with gear case body blank at strengthened shot peening；
（6）Tank body blank is placed into processing tooth socket on roughing tooth groove machine tool and carries out coarse milling tooth form process；
（7）By step（6）In ship heated at 370 DEG C with gear case body blank, then with the speed of 20 DEG C/h
2h is kept the temperature when being cooled to 205 DEG C, is then air-cooled to room temperature；
（8）The ship that will be cooled to room temperature is heated to 190 DEG C with gear case body blank, then carries out Carburization Treatment, should
Carburization Treatment less than in the environment of the oxygen concentration in air, carries out with gear case body blank ship to be heated to table in oxygen concentration
Face forms carburized layer；
（9）Nitrizing Treatment is carried out with gear case body blank to the ship after carburizing, by ship gear case body blank
It send into closed container and is passed through nitrogen, first will warm up 330 DEG C of holding 1h, be then heated to 410 DEG C and keep the temperature 7h, it is finally heated
To 540 DEG C of heat preservation 2h, then it is furnace-cooled to 180 DEG C and is air-cooled to room temperature again；
（10）To step（9）In ship carry out Tempering and Quenching with gear case body blank, Tempering and Quenching will be passed through
Ship afterwards is placed on lathe with gear case body blank and carries out finish turning process, and carries out finish-milling and cut tooth form process obtaining ship
Oceangoing ship gear case body finished product；
The concrete operations of Tempering and Quenching are：It is combined using normalizing and tempering, a normalizing+double tempering, for the first time
Temperature is more than second of temperature；Normalizing：450 DEG C of normalizing temperature, to temperature after keep the temperature 10min；It is tempered for the first time：Using
Heat stepwise, first segment heating temperature are 240 DEG C, to temperature after keep the temperature 15min, second segment heating temperature is 450 DEG C, to Wen Houbao
Warm 9min carries out second of tempering after being then air-cooled to room temperature；Be heated to 540 DEG C, to temperature after keep the temperature 15min；
（11）X-ray inspection is carried out to obtained finished product, examines qualified packaging and storage.
Embodiment 3
The present embodiment provides a kind of ship gear-box, which includes following components by mass percentage：
C：0.21%, Si：4%, Fe：0.7%, Mg：6%, Zn：0.6%, Mn：0.2%, Cr：0.5%, Ti：0.09%, Ni：0.9%, Nb：
0.03%, V：0.02%, Cu≤0.2%, P≤0.03%, S≤0.02%, rare earth：0.03%, surplus Al；
Chemical composition is the component of rare earth by mass percentage：La：19%, Sc：13%, Y：16%, Sm：20%；Nd：18%,
Ce：5%, Gd：9%, the sum of the above components are 100%；
Ship is prepared according to the following steps with gear case body：
（1）Ship gear case body mold is made as Modeling Material using molding sand and core sand, before casting mold is made, first to making
Molding sand in section bar material, which is placed in baker, is dried；
（2）Each ingredient of ship gear case body is heated into melting, obtains material liquid after all melting, temperature rises to
Then 690 DEG C of heat preservation 20-30min rise to 760 DEG C, and carry out refining degasification using pure argon gas using rotary getter, remove
The alterant that the mixing of Al-10Sr and Na salt is added in the backward material liquid of gas carries out Metamorphism treatment；
（3）By the material liquid injection step after Metamorphism treatment（1）In in molding mold, mold both sides setting sprue and
The ingate of dispersion is first poured into a mould on one side during cast, and when material liquid is about covered with mold half, both sides are injected simultaneously, then through sky
Ship gear case body blank is made in demoulding after cold；
（4）For step（3）In ship heated at 330 DEG C with gear case body blank, then with the speed of 24 DEG C/h
Degree keeps the temperature 1.8h when being cooled to 175 DEG C, is then air-cooled to room temperature；
（5）Ship is carried out with gear case body blank at strengthened shot peening；
（6）Tank body blank is placed into processing tooth socket on roughing tooth groove machine tool and carries out coarse milling tooth form process；
（7）By step（6）In ship heated at 340 DEG C with gear case body blank, then with the speed of 18 DEG C/h
1.5h is kept the temperature when being cooled to 205 DEG C, is then air-cooled to room temperature；
（8）The ship that will be cooled to room temperature is heated to 170 DEG C with gear case body blank, then carries out Carburization Treatment, should
Carburization Treatment less than in the environment of the oxygen concentration in air, carries out with gear case body blank ship to be heated to table in oxygen concentration
Face forms carburized layer；
（9）Nitrizing Treatment is carried out with gear case body blank to the ship after carburizing, by ship gear case body blank
It send into closed container and is passed through nitrogen, first will warm up 300 DEG C of holding 1h, be then heated to 410 DEG C and keep the temperature 6h, it is finally heated
To 540 DEG C of heat preservation 1.8h, then it is furnace-cooled to 180 DEG C and is air-cooled to room temperature again；
（10）To step（9）In ship carry out Tempering and Quenching with gear case body blank, Tempering and Quenching will be passed through
Ship afterwards is placed on lathe with gear case body blank and carries out finish turning process, and carries out finish-milling and cut tooth form process obtaining ship
Oceangoing ship gear case body finished product；
The concrete operations of Tempering and Quenching are：It is combined using normalizing and tempering, a normalizing+double tempering, for the first time
Temperature is more than second of temperature；Normalizing：450 DEG C of normalizing temperature, to temperature after keep the temperature 10min；It is tempered for the first time：Using
Heat stepwise, first segment heating temperature are 240 DEG C, to temperature after keep the temperature 15min, second segment heating temperature is 450 DEG C, to Wen Houbao
Warm 9min carries out second of tempering after being then air-cooled to room temperature；Be heated to 540 DEG C, to temperature after keep the temperature 15min；
（11）X-ray inspection is carried out to obtained finished product, examines qualified packaging and storage.
In addition to the implementation, the present invention can also have other embodiment.It is all to use equivalent substitution or equivalent transformation shape
Into technical solution, all fall within the present invention claims protection domain.
Claims (5)
1. a kind of ship gear-box, which is characterized in that the gear case body includes following components by mass percentage：C：
0.20-0.23%, Si：3-5%, Fe：0.6-0.8%, Mg：5-7%, Zn：0.5-0.8%, Mn：0.1-0.3%, Cr：0.4-0.6%,
Ti：0.08-0.13%, Ni：0.8-1.0%, Nb：0.02-0.04%, V：0.01-0.03%, Cu≤0.2%, P≤0.03%, S≤
0.02%, rare earth：0.01-0.04%, surplus Al；
Chemical composition is the component of the rare earth by mass percentage：La：18-23%, Sc：11-13%, Y：15-17%, Sm：20-
22%；Nd：18-21%, Ce：5-8%, Gd：The sum of 8-12%, the above components is 100%；
The ship is prepared according to the following steps with gear case body：
（1）Ship gear case body mold is made as Modeling Material using molding sand and core sand, before casting mold is made, first to Modeling Materials
Molding sand in material, which is placed in baker, is dried；
（2）Each ingredient of ship gear case body is heated into melting, obtains material liquid after all melting, temperature rises to 650-
Then 720 DEG C of heat preservation 20-30min rise to 750-780 DEG C, and carry out refining using pure argon gas using rotary getter and remove
Gas, the alterant for adding in the mixing of Al-10Sr and Na salt after degasification into material liquid carry out Metamorphism treatment；
（3）By the material liquid injection step after Metamorphism treatment（1）In in molding mold, mold both sides setting sprue and dispersion
Ingate, first pour into a mould on one side during cast, when material liquid is about covered with mold half, both sides are injected simultaneously, then after air-cooled
Ship gear case body blank is made in demoulding；
（4）For step（3）In ship heated at 300-350 DEG C with gear case body blank, then with 20-26 DEG C/h
Speed keep the temperature 1.5-2h when being cooled to 175 DEG C, be then air-cooled to room temperature；
（5）Strengthened shot peening processing is carried out with gear case body blank to ship；
（6）Tank body blank is placed into processing tooth socket on roughing tooth groove machine tool and carries out coarse milling tooth form process；
（7）By step（6）In ship heated at 320-370 DEG C with gear case body blank, then with 15-20 DEG C/h's
Speed keeps the temperature 1-2h when being cooled to 205 DEG C, be then air-cooled to room temperature；
（8）The ship that will be cooled to room temperature is heated to 150-190 DEG C with gear case body blank, then carries out Carburization Treatment, should
Carburization Treatment less than in the environment of the oxygen concentration in air, carries out with gear case body blank ship to be heated to table in oxygen concentration
Face forms carburized layer；
（9）Nitrizing Treatment is carried out with gear case body blank to the ship after carburizing, by ship with gear case body blank send to
In closed container and nitrogen is passed through, is first heated to 280-330 DEG C of holding 1h, 410 DEG C is then heated to and keeps the temperature 5-7h, it is finally heated
To 540 DEG C of heat preservation 1.5-2h, then it is furnace-cooled to 180 DEG C and is air-cooled to room temperature again；
（10）To step（9）In ship carry out Tempering and Quenching with gear case body blank, will be after Tempering and Quenching
Ship is placed on lathe with gear case body blank and carries out finish turning process, and carry out finish-milling cut tooth form process obtain ship use
Gear case body finished product；
（11）X-ray inspection is carried out to obtained finished product, examines qualified packaging and storage.
2. ship gear-box according to claim 1, it is characterised in that：Step（10）The Tempering and Quenching of middle progress,
The concrete operations of the Tempering and Quenching are：It is combined using normalizing and tempering, a normalizing+double tempering, is tempered for the first time
Temperature is more than second of temperature；Normalizing：450 DEG C of normalizing temperature, to temperature after keep the temperature 10min；It is tempered for the first time：Using segmentation
Heating, first segment heating temperature are 240 DEG C, to temperature after keep the temperature 15min, second segment heating temperature is 450 DEG C, to temperature after keep the temperature
9min carries out second of tempering after being then air-cooled to room temperature；Be heated to 540 DEG C, to temperature after keep the temperature 15min.
3. ship gear-box according to claim 1, it is characterised in that：The gear case body wraps by mass percentage
Include following components：C：0.20%, Si：3%, Fe：0.6%, Mg：5%, Zn：0.5%, Mn：0.1%, Cr：0.4%, Ti：0.08%, Ni：
0.8%, Nb：0.02%, V：0.01%, Cu≤0.2%, P≤0.03%, S≤0.02%, rare earth：0.01%, surplus Al；
Chemical composition is the component of the rare earth by mass percentage：La：18%, Sc：12%, Y：15%, Sm：21%；Nd：18%,
Ce：5%, Gd：11%, the sum of the above components are 100%.
4. ship gear-box according to claim 1, it is characterised in that：The gear case body wraps by mass percentage
Include following components：C：0.23%, Si：5%, Fe：0.8%, Mg：7%, Zn：0.8%, Mn：0.3%, Cr：0.6%, Ti：0.13%, Ni：
1.0%, Nb：0.04%, V：0.03%, Cu≤0.2%, P≤0.03%, S≤0.02%, rare earth：0.04%, surplus Al；
Chemical composition is the component of the rare earth by mass percentage：La：22%, Sc：11%, Y：15%, Sm：20%；Nd：18%,
Ce：6%, Gd：8%, the sum of the above components are 100%.
5. ship gear-box according to claim 1, it is characterised in that：The gear case body wraps by mass percentage
Include following components：C：0.21%, Si：4%, Fe：0.7%, Mg：6%, Zn：0.6%, Mn：0.2%, Cr：0.5%, Ti：0.09%, Ni：
0.9%, Nb：0.03%, V：0.02%, Cu≤0.2%, P≤0.03%, S≤0.02%, rare earth：0.03%, surplus Al；
Chemical composition is the component of the rare earth by mass percentage：La：19%, Sc：13%, Y：16%, Sm：20%；Nd：18%,
Ce：5%, Gd：9%, the sum of the above components are 100%.
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| DE102009013502A1 (en) * | 2009-03-17 | 2010-09-23 | Daimler Ag | Device for manufacturing a gearbox housing for a vehicle, comprises a casting mold, where a circular recess, into which a shaft is introducible, is disposed in a part area of the casting mold |
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