CN102658342B - Rolling machining method for propellers of stainless steel ships - Google Patents
Rolling machining method for propellers of stainless steel ships Download PDFInfo
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- CN102658342B CN102658342B CN201210133370.3A CN201210133370A CN102658342B CN 102658342 B CN102658342 B CN 102658342B CN 201210133370 A CN201210133370 A CN 201210133370A CN 102658342 B CN102658342 B CN 102658342B
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Abstract
The invention discloses a rolling machining method for propellers of stainless steel ships. The method comprises the following steps: 1, taking materials, namely taking stainless steel round tubes to make propeller hubs, and taking stainless steel plates to make propeller blanks; 2, heating before rolling, namely heating the propeller blanks at the temperature of between 800 and 1,150DEG C in a heating furnace; 3, rolling, namely rolling the heated propeller blanks by using a rolling machine; 4, shaping and heating, namely performing secondary heating on inclined plane propellers in the heating furnace at the temperature of between 700 and 900DEG C; 5, performing mold pressing for shaping, namely adopting mold pressing equipment which comprises an oil press and a shaper, putting the propellers subjected to secondary heating in the shaper, and pressing and forming the propellers to obtain curved surface stainless steel propellers; 6, welding, namely welding the formed propellers to the propeller hubs through electric welding; and 7, polishing, namely sanding oxide layers and welded positions on the surfaces of the welded propellers, and polishing by using a rag wheel to obtain the propellers of the stainless steel ships. The stainless steel thick plate materials are made through processes of heating and rolling, reheating, mould pressing and shaping into shaped propellers which have flexible structure and good strength, and the boat has saved energy consumption and good speed.
Description
Technical field
The present invention relates to a kind of processing method of motor-driven marine propeller, particularly relate to the rolling-type processing method of stainless steel marine propeller.
background technology
Power ship propulsion plant is under sail mainly screw, and screw structure directly affects propulsive efficiency, under identical horsepower (power), the proportional relation of the thickness of propeller blade and weight and fltting speed, the blade of screw is thinner, and weight is lighter, advance effectively, ship's speed is just faster.Because ship travels in the environment of ocean salt, be unable to undergo carbon steel, the cast iron of seawater corrosion and all can not process screw, so have screw multiselect, with cast copper, produce, if but cast copper propeller blade is thin, in the situation that shallow water is encountered barrier, intensity just can not guarantee, is easy to fracture damage, therefore, can only be processed into the blade of heavy wall, heavy cast copper screw has restricted the speed of ship, and service life is short, and repair and replacement expense is high.On the other hand, the lagging edge of existing cast copper propeller blade is arc-shaped side, makes to advance effect to be subject to again certain impact, and the ship's speed that slowed down, has increased energy consumption.In order to change the shortcoming of cast copper screw, people's stainless steel material on probation is produced marine propeller, because the mobility of stainless steel molten steel is very poor, if adopting stainless steel casting propeller blade but cannot realize, another kind of way application stainless sheet steel is made the blade of screw by composite welding, but in the middle of composite bed, there is cavity, cause whole blade profile wall thickness, the requirement that does not reach energy saving and speed increasing.If adopt, forge processing stainless steel propeller blade, needing strict controlled working temperature is 900 ℃-1100 ℃, due to blade thin edge, in air, be easy to coolingly, can not keep the condition of high temperature, in addition, the periphery of propeller blade is thin, middle part is thick, and vane thickness is inhomogeneous, and pneumatic hammer is difficult to forge processing.
summary of the invention
The object of the invention is the shortcoming existing in order to overcome prior art, a kind of employing stainless steel thick plate material is provided, by heating roll extrusion, the operation such as heating and mould pressing sizing again, make the propeller arrangement of moulding dexterous, intensity is good, the saving energy of ship, the rolling-type processing method of fireballing stainless steel marine propeller.
The technical scheme of the rolling-type processing method of stainless steel marine propeller of the present invention is: it is characterized in that:
First step feeding: get stainless pipe and make stainless steel propeller hub, get corrosion resistant plate blade blank processed;
Heating before second step roll extrusion: adopt heating furnace, corrosion resistant plate blade blank is put into heating furnace and be heated to 800 ℃-1150 ℃;
The 3rd step roll extrusion: application roller press carries out roll extrusion to the stainless steel blade blank after heating, described roller press comprises frame and rolling mechanism, described frame comprises base, bottom plate is set on base, four jiaos of bottom plate arrange guide pillar, fixed head is installed at the top of guide pillar, between bottom plate and upper mounted plate, there is portable plate, four jiaos of portable plates have pilot hole to match with guide pillar activity, described rolling mechanism comprises seaming roll and lower live-rollers, below described portable plate, install bearing, match with upper bearing (metal) in two of upper seaming roll, by upper roller motor, the rotating shaft after reducing gear speed change drives rotation to upper seaming roll, upper seaming roll rotation speed n=1-3 rev/min, hydraulic cylinder is set on upper mounted plate, hydraulic cylinder connects oil pump through petroleum pipeline, the piston rod of hydraulic cylinder connects portable plate, hydraulic cylinder presses down or the movement of rising upper seaming roll by portable plate, two of described lower live-rollers coordinates with lower bearing, lower bearing is arranged on bottom plate, by lower roller motor, the output shaft after gear-box slows down drives rotation to lower live-rollers, the rotating speed of lower live-rollers and the synchronization of upper seaming roll, on base and bottom plate, raceway is set, the height of raceway is highly consistent above with lower live-rollers, and the stainless steel blade blank after heating enters between upper seaming roll and lower live-rollers, by making tapered plane blade after roll extrusion through raceway,
The 4th step sizing heating: tapered plane blade is put into heating furnace post bake to 700 ℃-900 ℃;
The 5th step mold pressing sizing: mold pressing modular system comprises hydraulic press and shaper, stainless steel blade after post bake is placed in shaper, the curved surface of shaper is according to the requirement design of marine propeller, mould is divided into lower stock mould and upper dynamic model, by shaper, oppresses after moulding to obtain curved surface stainless steel blade;
The 6th step welding: get the curved surface stainless steel blade after stainless steel propeller hub and moulding, adopt the stainless steel blade after electric weld handle moulding to be welded on stainless steel propeller hub;
The 7th polishing: first with emery wheel, oxide layer and the weld of the stainless steel blade surface after welding are carried out to sanding, then carry out making stainless steel marine propeller after polishing with full-disk buff.
The invention discloses a kind of rolling-type processing method of stainless steel marine propeller, take stainless pipe material and make propeller hub, the material that will select diameter and pipe thickness to be consistent according to the size of manufacturing screw, like this as long as cutting length, and need not process the profile of propeller hub and the size in aperture, save material, reduce processing charges.One of welding mutually of the blade of screw and propeller hub is thicker, blade is just thinner more outward, a this blade thick and attenuate gradually relies on roll extrusion out, so the stainless steel materials thickness of taking is slightly thicker than or is equal to the thickness of propeller shank, first on the stainless plate of bulk, carry out the line of size and shape, cut into stainless steel blade blank, cutting tool comprises employing plasma cutting or sawing or gas cutting etc. again.Heating before roll extrusion, adopt heating furnace, stainless steel blade blank is put into heating furnace to be heated, heating-up temperature is 800 ℃ of-1150 ℃ of states, roll extrusion is different from the equipment forging and method, key technology of the present invention is the technology and equipment of roll extrusion, adopt a kind of special roller press, this roller press comprises rack section and rolling mechanism part, described frame comprises base, bottom plate, upper mounted plate and intermediate active plate, three blocks of plates are by four guide pillars (or claiming column) series winding, and upper and lower two boards maintains static, and intermediate active plate is done up and down.Rolling mechanism comprises a lower live-rollers that can only rotate, the upper seaming roll that another root can rotate and do to press down, processed blade between upper and lower roll by time the double action of being rolled and pressing, particularly go up the downward pressure of seaming roll generation for continuing to increase, so it is thick that the blade after rolled starts, attenuate gradually then, this meets the requirement that propeller shank is thick, tip is thin.Even and if the corrosion resistant plate after this rolling technology heating also can continue processing in the situation that temperature declines, concrete structure and annexation about rolling mechanism, be included in below portable plate and install bearing, two of upper seaming roll is made axle and is matched with upper bearing (metal), roller motor is set on the base of frame, upper roller motor is through reducing gear speed change, in order to make less power of motor drive upper seaming roll, so reducing gear is more piece gear reduction, rotating speed is become to very slow, the output revolving shaft of reducing gear after speed change drives seaming roll by shaft coupling, rotation speed n=1-3 rev/min of upper seaming roll, rotating torque is very large like this.Upper seaming roll not only rotates, to press down simultaneously, just can make processed blade attenuation, play roll extrusion function, the mechanism that upper seaming roll is pressed down comprises the oil pump being arranged on base, is arranged on the hydraulic cylinder on upper mounted plate, and the piston rod of hydraulic cylinder connects portable plate, it is adjustable that pressure is controlled, under the effect of pressure fuel pump, make portable plate on seaming roll press down.The rotation that lower live-rollers produces, that lower roller motor is set on base, lower roller motor drives lower live-rollers very slowly through the rotating speed of more piece gear-box deceleration rear output shaft equally, make the synchronization of lower live-rollers and upper seaming roll, upper seaming roll and lower live-rollers carry out after rolling and processing processed blade, make the metallographic structure of stainless steel blade that variation occur, intensity is improved.Trial product detects through species abundance in Baosteel in Shanghai industrial technology Services Co., Ltd, and hot strength is 270MPa, surpasses more than designing requirement 250MPa, and percentage elongation reaches 640MPa left and right, the index that is above standard 500MPa.On base and bottom plate, raceway is set, the height of raceway (upper surface) is consistent with the height of lower live-rollers (above), processed stainless steel blade blank passes through between upper seaming roll and lower live-rollers by raceway, after process finishing, under the effect of oil pump, make again seaming roll raise, take out the blade after processing, this roller press not only can be processed the length direction of blade, can also process two broadsides of blade.By roller press, blade is reached after the thickness of designing requirement, again blade is put into heating furnace and carry out post bake, after blade is softening by post bake to 700 ℃-900 ℃, be put in shaper, shaper be positioned on hydraulic press (hydraulic press be specifically configured to prior art, can purchase from the market) in, comprise lower stock mould and upper dynamic model, the die cavity of mould carries out Design and manufacture according to the shape of screw, by blade after sizing mold pressing, become curved surface, cambered blade is welded on propeller hub, with emery wheel, the oxide layer of weld and blade surface is carried out to sanding, polishing, obtain the stainless steel marine propeller of moulding.
The rolling-type processing method of stainless steel marine propeller of the present invention, described heating furnace is electrothermal furnace or coke-fired furnace.Described corrosion resistant plate blade blank is put into heating furnace and is heated to 1000 ℃-1100 ℃.Described tapered plane blade is put into heating furnace post bake, is heated to 800 ℃.Described hydraulic cylinder is two, and cylinder pressure is 300MPa-800MPa.
accompanying drawing explanation
Fig. 1 is the main TV structure schematic diagram of stainless steel marine propeller roller press;
Fig. 2 is the plan structure schematic diagram of stainless steel marine propeller roller press;
Fig. 3 is the main TV structure schematic diagram of hydraulic press and shaper.
The specific embodiment
The rolling-type processing method that the present invention relates to a kind of stainless steel marine propeller, as shown in Fig. 1-Fig. 3, is characterized in that:
First step feeding: get stainless pipe and make stainless steel propeller hub, get corrosion resistant plate blade blank processed;
Heating before second step roll extrusion: adopt heating furnace, corrosion resistant plate blade blank is put into heating furnace and be heated to 800 ℃-1150 ℃;
The 3rd step roll extrusion: application roller press carries out roll extrusion to the stainless steel blade blank after heating, described roller press comprises frame and rolling mechanism, described frame comprises base 1, bottom plate 12 is set on base, four jiaos of bottom plate arrange guide pillar 11, fixed head 13 is installed at the top of guide pillar 11, between bottom plate 12 and upper mounted plate 13, there is portable plate 14, four jiaos of portable plates have pilot hole 141 to match with guide pillar 11 activities, described rolling mechanism comprises seaming roll 2 and lower live-rollers 3, described portable plate 14 is installed bearing 142 below, match with upper bearing (metal) 142 in two of upper seaming roll 2, by upper roller motor 21, the rotating shaft after reducing gear 22 speed changes 28 drives rotation to upper seaming roll 2, upper seaming roll rotation speed n=1-3 rev/min, hydraulic cylinder 24 is set on upper mounted plate 13, hydraulic cylinder 24 connects oil pump 26 through petroleum pipeline 27, the piston rod 25 of hydraulic cylinder connects portable plate 14, hydraulic cylinder 24 presses down or the movement of rising by 14 pairs of upper seaming rolls 2 of portable plate, two of described lower live-rollers 3 coordinates with lower bearing 31, lower bearing is arranged on bottom plate 12, by lower roller motor 32, the output shaft after gear-box 35 slows down 33 drives rotation to lower live-rollers 3, the synchronization of the rotating speed of lower live-rollers 3 and upper seaming roll 2, on base and bottom plate 12, raceway 5 is set, the height of raceway and lower live-rollers 3 36 highly consistent above, stainless steel blade blank after heating enters between upper seaming roll 2 and lower live-rollers 3, by making tapered plane blade after roll extrusion through raceway,
The 4th step sizing heating: tapered plane blade is put into heating furnace post bake to 700 ℃-900 ℃;
The 5th step mold pressing sizing: mold pressing modular system comprises hydraulic press 6 and shaper 7, stainless steel blade after post bake is placed in shaper 7, the curved surface of shaper 7 is according to the requirement design of marine propeller, mould is divided into lower stock mould 72 and upper dynamic model 71, by shaper, oppresses after moulding to obtain curved surface stainless steel blade;
The 6th step welding: get the curved surface stainless steel blade after stainless steel propeller hub and moulding, adopt the stainless steel blade after electric weld handle moulding to be welded on stainless steel propeller hub;
The 7th polishing: first with emery wheel, oxide layer and the weld of the stainless steel blade surface after welding are carried out to sanding, then carry out making stainless steel marine propeller after polishing with full-disk buff.
Take stainless pipe material, the material that select diameter and pipe thickness to be consistent according to the size of manufacturing screw is made propeller hub, like this as long as cut length, and need not process the profile of propeller hub and the size in aperture, saves material, reduces processing charges.One of welding mutually of the blade of screw and propeller hub is thicker, blade is just thinner more outward, a this blade thick and attenuate gradually relies on roll extrusion out, so the stainless steel materials thickness of taking is slightly thicker than or is equal to the thickness of propeller shank, first on the stainless plate of bulk, carry out the line of size and shape, cut into stainless steel blade blank, cutting tool comprises employing plasma cutting or sawing or gas cutting etc. again.Heating before roll extrusion, adopt heating furnace, stainless steel blade blank is put into heating furnace to be heated, heating-up temperature is 800 ℃ of-1150 ℃ of states, roll extrusion is different from the equipment forging and method, key technology of the present invention is the technology and equipment of roll extrusion, adopt a kind of special roller press, this roller press comprises rack section and rolling mechanism part, described frame comprises base 1, bottom plate 12, upper mounted plate 13 and intermediate active plate 14, three blocks of plates are by four guide pillar 11(or title column) series winding, on, lower two boards maintains static, intermediate active plate 14 is done up and down.Rolling mechanism comprises a lower live-rollers 3 that can only rotate, the upper seaming roll 2 that another root can rotate and do to press down, processed blade between upper and lower roll by time the double action of being rolled and pressing, particularly go up the downward pressure of seaming roll 2 generations for continuing to increase, so it is thick that the blade after rolled starts, attenuate gradually then, this meets the requirement that propeller shank is thick, tip is thin.Even and if the corrosion resistant plate after this rolling technology heating also can continue processing in the situation that temperature declines, concrete structure and annexation about rolling mechanism, be included in portable plate 14 and install bearing 142 below, two of upper seaming roll 2 is made axle and is matched with upper bearing (metal) 142, on the base 1 of frame, roller motor 21 is set, upper roller motor is through reducing gear 22 speed changes, in order to make less power of motor drive upper seaming roll 2, so reducing gear 22 is more piece gear reduction, rotating speed is become to very slow, the output revolving shaft of reducing gear after speed change drives seaming roll 2 by shaft coupling, rotation speed n=1-3 rev/min of upper seaming roll, rotating torque is very large like this.Upper seaming roll not only rotates, to press down simultaneously, just can make processed blade attenuation, play roll extrusion function, the mechanism that upper seaming roll 2 is pressed down comprises the oil pump 26 being arranged on base 1, is arranged on the hydraulic cylinder 24 on upper mounted plate 13, and the piston rod 25 of hydraulic cylinder connects portable plate, it is adjustable that pressure is controlled, under the effect of oil pump 26 pressure, make portable plate on seaming roll 2 press down.The rotation that lower live-rollers 3 produces, that lower roller motor 32 is set on base 1, lower roller motor drives lower live-rollers 3 very slowly through the rotating speed of more piece gear-box 35 deceleration rear output shafts 33 equally, make the synchronization of lower live-rollers and upper seaming roll, upper seaming roll 2 carries out after rolling and processing processed blade with lower live-rollers, make the metallographic structure of stainless steel blade that variation occur, intensity is improved.Trial product detects through species abundance in Baosteel in Shanghai industrial technology Services Co., Ltd, and hot strength is 270MPa, surpasses more than designing requirement 250MPa, and percentage elongation reaches 640MPa left and right, the index that is above standard 500MPa.On base 1 and bottom plate 12, raceway 5 is set, the height of raceway (upper surface) is with above lower live-rollers 3() height consistent, processed stainless steel blade blank passes through between upper seaming roll 2 and lower live-rollers 3 by raceway 5, after process finishing, under the effect of oil pump 26, make again seaming roll raise, take out the blade after processing, this roller press not only can be processed the length direction of blade, can also process two broadsides of blade.By roller press, blade is reached after the thickness of designing requirement, again blade is put into heating furnace and carry out post bake, after blade is softening by post bake to 700 ℃-900 ℃, be put in shaper, what shaper 7 was positioned on hydraulic press 6(hydraulic press is specifically configured to prior art, can purchase from the market) in, comprise lower stock mould 72 and upper dynamic model 71, the die cavity of mould carries out Design and manufacture according to the shape of screw, by the rear blade of sizing mold pressing 7, become curved surface, cambered blade is welded on propeller hub, with emery wheel, the oxide layer of weld and blade surface is carried out to sanding, polishing, obtain the stainless steel marine propeller of moulding.Described heating furnace is electrothermal furnace or coke-fired furnace.Described corrosion resistant plate blade blank is put into heating furnace and is heated to 1000 ℃-1100 ℃.Described tapered plane blade is put into heating furnace post bake, is heated to 800 ℃.Described hydraulic cylinder 24 is two, and cylinder pressure is 300MPa-800MPa.
Claims (5)
1. the rolling-type processing method of stainless steel marine propeller, is characterized in that:
First step feeding: get stainless pipe and make stainless steel propeller hub, get corrosion resistant plate blade blank processed;
Heating before second step roll extrusion: adopt heating furnace, corrosion resistant plate blade blank is put into heating furnace and be heated to 800 ℃-1150 ℃;
The 3rd step roll extrusion: application roller press carries out roll extrusion to the stainless steel blade blank after heating, described roller press comprises frame and rolling mechanism, described frame comprises base (1), bottom plate (12) is set on base, four jiaos of bottom plate arrange guide pillar (11), fixed head (13) is installed at the top of guide pillar (11), between bottom plate (12) and upper mounted plate (13), there is portable plate (14), four jiaos of portable plates have pilot hole (141) to match with guide pillar (11) activity, described rolling mechanism comprises seaming roll (2) and lower live-rollers (3), described portable plate (14) is installed bearing (142) below, match with upper bearing (metal) (142) in two of upper seaming roll (2), by upper roller motor (21), the rotating shaft (28) after reducing gear (22) speed change drives rotation to upper seaming roll (2), upper seaming roll rotation speed n=1-3 rev/min, hydraulic cylinder (24) is set on upper mounted plate (13), hydraulic cylinder (24) connects oil pump (26) through petroleum pipeline (27), the piston rod of hydraulic cylinder (25) connects portable plate (14), hydraulic cylinder (24) presses down or the movement of rising upper seaming roll (2) by portable plate (14), two of described lower live-rollers (3) coordinates with lower bearing (31), lower bearing is arranged on bottom plate (12), by lower roller motor (32), the output shaft (33) after gear-box (35) slows down drives rotation to lower live-rollers (3), the synchronization of the rotating speed of lower live-rollers (3) and upper seaming roll (2), on base and bottom plate (12), raceway (5) is set, the height of raceway is highly consistent with (36) above lower live-rollers (3), stainless steel blade blank after heating enters between upper seaming roll (2) and lower live-rollers (3) through raceway, by making tapered plane blade after roll extrusion,
The 4th step sizing heating: tapered plane blade is put into heating furnace post bake to 700 ℃-900 ℃;
The 5th step mold pressing sizing: mold pressing modular system comprises hydraulic press (6) and shaper (7), stainless steel blade after post bake is placed in shaper (7), the curved surface of shaper (7) is according to the requirement design of marine propeller, mould is divided into lower stock mould (72) and upper dynamic model (71), by shaper, oppresses after moulding to obtain curved surface stainless steel blade;
The 6th step welding: get the curved surface stainless steel blade after stainless steel propeller hub and moulding, adopt the stainless steel blade after electric weld handle moulding to be welded on stainless steel propeller hub;
The 7th polishing: first with emery wheel, oxide layer and the weld of the stainless steel blade surface after welding are carried out to sanding, then carry out making stainless steel marine propeller after polishing with full-disk buff.
2. the rolling-type processing method of stainless steel marine propeller as claimed in claim 1, is characterized in that described heating furnace is electrothermal furnace or coke-fired furnace.
3. the rolling-type processing method of stainless steel marine propeller as claimed in claim 1, is characterized in that described corrosion resistant plate blade blank puts into heating furnace and be heated to 1000 ℃-1100 ℃.
4. the rolling-type processing method of stainless steel marine propeller as claimed in claim 1, is characterized in that described tapered plane blade puts into heating furnace post bake, is heated to 800 ℃.
5. the rolling-type processing method of stainless steel marine propeller as claimed in claim 1, is characterized in that described hydraulic cylinder (24) is two, and cylinder pressure is 300MPa-800MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210133370.3A CN102658342B (en) | 2012-05-03 | 2012-05-03 | Rolling machining method for propellers of stainless steel ships |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210133370.3A CN102658342B (en) | 2012-05-03 | 2012-05-03 | Rolling machining method for propellers of stainless steel ships |
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| CN102658342A CN102658342A (en) | 2012-09-12 |
| CN102658342B true CN102658342B (en) | 2014-03-26 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109352265B (en) * | 2018-08-28 | 2020-03-31 | 浙江众立机械制造有限公司 | Propeller machining process |
| CN114248983B (en) * | 2020-09-21 | 2023-08-01 | 广东天机工业智能系统有限公司 | Automatic processing production line |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1160151B (en) * | 1983-01-07 | 1987-03-04 | Innocente Riganti Off Mec | PROPELLER MANUFACTURING PROCEDURE |
| CN2136805Y (en) * | 1992-09-10 | 1993-06-23 | 广西南宁市摩力特种合金铸造厂 | Stainless steel propeller |
| GB2306353B (en) * | 1995-10-28 | 1998-10-07 | Rolls Royce Plc | A method of manufacturing a blade |
| CN2297384Y (en) * | 1996-05-04 | 1998-11-18 | 蓝学军 | Stainless screw propeller |
| CN1063687C (en) * | 1997-10-16 | 2001-03-28 | 杨光兴 | Technique for integral casting of stainless steel propeller |
| JP5452025B2 (en) * | 2008-05-19 | 2014-03-26 | 株式会社日立製作所 | Blades, impellers, turbo fluid machinery |
| JP4295813B1 (en) * | 2008-11-13 | 2009-07-15 | 株式会社金沢鉄工所 | Integrated press molding method and press machine for hollow nozzle blade for steam turbine |
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Application publication date: 20120912 Assignee: Three county HENGGUAN Machinery Factory Assignor: Huang Shansong Contract record no.: 2014330000231 Denomination of invention: Rolling machining method for propellers of stainless steel ships Granted publication date: 20140326 License type: Exclusive License Record date: 20140616 |
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Effective date of registration: 20201224 Address after: Silitang village, pubagang Town, Sanmen County, Taizhou City, Zhejiang Province 317100 Patentee after: SANMEN HENGGUAN PROPELLER Co.,Ltd. Address before: 318013 No.147, Baozhen Road, Taozhu Town, Linhai City, Taizhou City, Zhejiang Province Patentee before: Huang Shansong |
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