CN101947633A - Die forging process and special die for final stage blade of large half-RPM (Revolution per Minute) nuclear turbine - Google Patents

Die forging process and special die for final stage blade of large half-RPM (Revolution per Minute) nuclear turbine Download PDF

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Publication number
CN101947633A
CN101947633A CN2010102783741A CN201010278374A CN101947633A CN 101947633 A CN101947633 A CN 101947633A CN 2010102783741 A CN2010102783741 A CN 2010102783741A CN 201010278374 A CN201010278374 A CN 201010278374A CN 101947633 A CN101947633 A CN 101947633A
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CN
China
Prior art keywords
die
forging
blank
die forging
patrix
Prior art date
Application number
CN2010102783741A
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Chinese (zh)
Inventor
刘玉宝
倪明明
李湘军
邵燃
徐大懋
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无锡透平叶片有限公司
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Priority to CN2010102783741A priority Critical patent/CN101947633A/en
Publication of CN101947633A publication Critical patent/CN101947633A/en

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Abstract

The invention provides a die forging process for a final stage blade of a large half-RPM (Revolution per Minute) nuclear turbine. The die forging of only single forging die is required to ensure the die forging forming of a blade forge piece, so that the manufacturing cost of the blade is reduced, the die forging cycle is shortened, and the processing efficiency is improved; moreover, the correction times inside the die of the blade forge piece is effectively reduced, and the production capacity of forging is increased. The invention has the technical scheme comprising the following steps of: upsetting a bar by using an oil press, stretching the bar in radial direction to prepare a blank, and forging the stretched blank in a forging die for forming; then, thermally cutting off the flashing fins for the die forging, and thermally correcting for the die forging; and finally, thermally treating. The process is characterized in that the radial stretching for preparing the blank adopts an electro-hydraulic hammer to carry out free forging and stretching to prepare the blank, and the blank is optimized into the structure with most circular cross sections and partial flat square cross sections. The invention also provides a special die which comprises an upper die and a lower die, wherein the four corner endss of the upper die are provided with guide pillars, and the lower die is correspondingly provided with guide sleeves. The special die is characterized in that the outer sides of the die cavities of the upper die and the lower die are side upright wall structures which are mutually overlapped, and the guide pillars and the guide sleeves are respectively arranged on the side upright wall structures of the upper die and the lower die.

Description

Large-scale half speed nuclear steam turbine final blades contour forging technique and particular manufacturing craft
Technical field
The present invention relates to technical field of hot working, be specially large-scale half speed nuclear steam turbine final blades contour forging technique and particular manufacturing craft.
Background technology
At present external large-scale half speed nuclear steam turbine final blades contour forging technique be with bar with hydraulic press or horizontal forging and upsetting machine heading after radial forging pulling base, then through blocking, finish forging, adopt in the mould room temperature pressurize to proofread and correct after the final heat treatment.Its shortcoming is: the blank shape of cross section after the radial forging pulling is for circular, owing to be subjected to the influence of blade profile shape, its forging molding must pass through blocking and finish-forging, this just needs to make blocker and finisher two secondary forging dies, and general blade production mould has the characteristics of the many kinds of small lot, it is higher that die cost accounts for the ratio of total manufacturing cost, thus its die cost height, the manufacturing cost height of blade; And because the blank cross section is more single circle, causes wide string blade to fill type and relatively take material, the stock utilization of forging is low, thereby also makes the manufacturing cost height of blade; And die forging needs blocking and finish-forging, and because of the mould volume is big, a press can't be installed two secondary forging dies simultaneously, so blocking and finish-forging can't carry out continuously, and its die forging cycle is long, and working (machining) efficiency is low; In addition, adopt in mould the room temperature pressurize to proofread and correct after its heat treatment, the service time of its clutch type flypress, long, the forging die number of times of entering the court was more, and it is low to forge the production capacity of producing.
Summary of the invention
At the problems referred to above, the invention provides large-scale half speed nuclear steam turbine final blades contour forging technique, the single secondary forging die die forging of its needs can guarantee the blade forging die-forging forming, reduces the blade manufacturing cost greatly, shortens the die forging cycle, improves working (machining) efficiency; It can effectively reduce the number of times of proofreading and correct in the clutch type flypress mould on the blade forging, improves and forges the production production capacity; For this reason, the present invention also provides particular manufacturing craft.
Its technical scheme is such, with bar hydraulic press heading, then described bar is radially pulled out base, again the blank after the described pulling is put into forging mold and carry out forging molding, then earnestly removing of overlap carried out in die forging, carry out the thermal recalibration of die forging again, heat-treat at last, it is characterized in that: the described base that radially pulls out, adopt electric liquid hammer open die forging pulling base, blank is optimized for cross section part except that circle is the version of deltiod.
It is further characterized in that: adopt thermal recalibration in the mould after described die forging, hot trimming; After described final heat treatment, on hydraulic press, carry out the manual correction of room temperature.
Large-scale half speed nuclear steam turbine final blades die forging particular manufacturing craft, it comprises patrix and counterdie, four jiaos of ends of described patrix are provided with guide pillar, described counterdie correspondence is provided with guide pin bushing, it is characterized in that: the die cavity outside of described patrix and counterdie corresponds to the straight wall construction of side of mutual fit, and described guide pillar and guide pin bushing are arranged in respectively on the straight wall construction of side of described patrix and counterdie.
It is further characterized in that: the guiding single face gap of described guide pillar and guide pin bushing is 0.6mm~0.7mm; It is 0.4mm~0.5mm that described patrix cooperates the single face gap with the straight wall of side of counterdie.
Compare with external large-scale half speed nuclear steam turbine final blades contour forging technique, the beneficial effect of technology of the present invention is: its pulling base adopts electric liquid hammer open die forging pulling base, make the cross section of its blank have circular cross-section and square-section simultaneously, can satisfy wide string blade well and forge the requirement of filling type, improve the forging stock utilization; Simultaneously, since its blank circular cross-section and square-section and deposit and satisfied the requirement that type is filled in wide string blade forging well, it is promptly plastic to make follow-up forging only need carry out the secondary forging die die forging of list, reduced the cost that a secondary mould is got the raw materials ready and made, shortened the die forging cycle, improve the production efficiency of blade forging, reduced production cost; After the heat treatment, on hydraulic press, carry out the manual correction of room temperature, the room temperature pressurize is proofreaied and correct in the mould of external employing, it can effectively proofread and correct leaf curling and the profile distortion that causes in forging, cooling and the heat treatment process, guarantee the precision of blade die forging piece preferably, go up number of corrections in the clutch type flypress mould thereby effectively reduce, improve production capacity, thereby further reduce the blade manufacturing cost.Dedicated integral formula forging die structure of the present invention, its guide pillar and guide pin bushing structural configuration are on the straight wall construction of side, its whole process guide that can guarantee patrix and counterdie closure is accurate, solves blade because of the blade that side force causes greatly forges the offsetting problem, further guarantees the precision of blade die forging piece.
Description of drawings
Fig. 1 is special-purpose mould sectional structure schematic diagram in the large-scale half speed nuclear steam turbine of the present invention final blades contour forging technique;
Fig. 2 is the blank structure schematic diagram of bar after radially pulling out base in the technology of the present invention;
Fig. 3 be among Fig. 2 A-A to the sectional structure schematic diagram;
Fig. 4 be among Fig. 2 B-B to the sectional structure schematic diagram;
Fig. 5 be among Fig. 2 C-C to the sectional structure schematic diagram;
Fig. 6 be among Fig. 2 D-D to the sectional structure schematic diagram;
Fig. 7 be among Fig. 2 E-E to the sectional structure schematic diagram;
Fig. 8 be among Fig. 2 F-F to the sectional structure schematic diagram.
The specific embodiment
Technology of the present invention is with bar hydraulic press heading, adopt electric liquid hammer open die forging radially to pull out base to bar then, see Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7 and Fig. 8, its blank structure cross section part except that circle is deltiod (Fig. 3, double dot dash line represents that this cross section, three places can be flat according to the suitable bat of moulding requirement among Fig. 5 and Fig. 7), its single secondary forging die die forging adopts the Forging Technology of the every fiery deflection of many fire control of chamber system to reach the effect of blocking and finish-forging, blank after will pulling out is again put into forging mold and is carried out forging molding, hot trimming, thermal recalibration in the mould, heat-treat again, on hydraulic press, carry out the manual correction of room temperature after the heat treatment.After described die forging, hot trimming, adopt thermal recalibration in the mould, can in time proofread and correct the distortion that hot trimming causes like this, guarantee the dimensional accuracy on the blade vertical direction.In the technology of the present invention, the bar heading also can adopt electric liquid hammer heading; Adopt pneumatic hammer or preforming machine that bar is carried out open die forging and radially pull out base, also the effect that can reach blank circular cross-section and square-section and deposit.
See Fig. 1, particular manufacturing craft of the present invention, it comprises patrix 1 and counterdie 2,1 four jiaos of ends of patrix are provided with guide pillar 3, counterdie 2 correspondences are provided with guide pin bushing 4, the die cavity outside of patrix 1 and counterdie 2 corresponds to the straight wall construction of side of mutual fit, and guide pillar 3 is arranged in respectively on the straight wall construction of side of described patrix and counterdie with guide pin bushing 4.Guide pillar 3 is 0.6mm~0.7mm with the guiding single face gap 6 of guide pin bushing 4; Patrix cooperates single face gap 7 to be 0.4mm~0.5mm with the straight wall of side of counterdie.Among Fig. 1,5 is blank.In the blank forging process, patrix 1 and counterdie 2 matched moulds, blank 5 has begun thick guiding with (be blank generation plastic deformation before) guide pillar 3 and guide pin bushing 4 before patrix 1 contacts, treat that the straight wall construction of side of patrix 1 and counterdie 2 just began smart guiding when blank 5 crimped onto less degree, end up to forging.Patrix 1 and the guide pillar guide pin bushing structure of counterdie 2 and cooperating of the straight wall construction of side can guarantee the accuracy that leads in the forging process, solve blade because of the blade that side force causes greatly forges lateral displacement and problem of misalignment, guarantee the precision of blade die forging piece.

Claims (6)

1. large-scale half speed nuclear steam turbine final blades contour forging technique, with bar hydraulic press heading, then described bar is radially pulled out base, again the blank after the described pulling is put into forging mold and carry out forging molding, then earnestly removing of overlap carried out in die forging, carry out the thermal recalibration of die forging again, heat-treat at last, it is characterized in that: the described base that radially pulls out, adopt electric liquid hammer open die forging pulling base, blank is optimized for cross section part except that circle is the version of deltiod.
2. large-scale half speed nuclear steam turbine final blades contour forging technique according to claim 1 is characterized in that: adopt thermal recalibration in the mould after described die forging, hot trimming.
3. large-scale half speed nuclear steam turbine final blades contour forging technique according to claim 2 is characterized in that: after described final heat treatment, carry out the manual correction of room temperature on hydraulic press.
4. large-scale half speed nuclear steam turbine final blades die forging particular manufacturing craft, it comprises patrix and counterdie, four jiaos of ends of described patrix are provided with guide pillar, described counterdie correspondence is provided with guide pin bushing, it is characterized in that: the die cavity outside of described patrix and counterdie corresponds to the straight wall construction of side of mutual fit, and described guide pillar and guide pin bushing are arranged in respectively on the straight wall construction of side of described patrix and counterdie.
5. large-scale half speed nuclear steam turbine final blades die forging particular manufacturing craft according to claim 4, it is characterized in that: the guiding single face gap of described guide pillar and guide pin bushing is 0.6mm~0.7mm.
6. large-scale half speed nuclear steam turbine final blades die forging particular manufacturing craft according to claim 5, it is characterized in that: it is 0.4mm~0.5mm that described patrix cooperates the single face gap with the straight wall of side of counterdie.
CN2010102783741A 2010-09-11 2010-09-11 Die forging process and special die for final stage blade of large half-RPM (Revolution per Minute) nuclear turbine CN101947633A (en)

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Application Number Priority Date Filing Date Title
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102162469A (en) * 2011-04-14 2011-08-24 四川振强模锻有限公司 Aluminum blade of fan and manufacturing technology thereof
CN104707926A (en) * 2013-12-12 2015-06-17 陕西宏远航空锻造有限责任公司 Molding and forging method of large arched forging stock
CN104959505A (en) * 2015-07-22 2015-10-07 李孟平 Improved blade forging device and forging method thereof
CN105499464A (en) * 2016-01-11 2016-04-20 无锡透平叶片有限公司 Steam turbine separation plate blade mold and designing method thereof
CN105598350A (en) * 2015-12-28 2016-05-25 无锡透平叶片有限公司 Forging process for Nimonic101 alloy blade forging
CN106378403A (en) * 2016-08-31 2017-02-08 无锡派克新材料科技股份有限公司 Switching section molding method
CN107282849A (en) * 2017-07-13 2017-10-24 安徽众鑫科技股份有限公司 A kind of automobile differential left half axle forging technology
CN111014553A (en) * 2019-12-06 2020-04-17 陕西宏远航空锻造有限责任公司 Forging method for controlling size angle of irregular triangular rough shape

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CN1048994A (en) * 1989-10-18 1991-02-06 航空工业部红原锻铸厂 Large-size steam turbine titanium alloy linear leaf forging and device
KR20050119802A (en) * 2004-06-17 2005-12-22 현대중공업 주식회사 Closed-die forging method and die of crank throw pintaper part
CN201170119Y (en) * 2008-03-21 2008-12-24 哈尔滨汽轮机厂有限责任公司 Full rotary speed air cooling steam turbine last stage blade
CN101758133A (en) * 2010-02-25 2010-06-30 无锡透平叶片有限公司 Edge flashing and off-clipping mechanism for large-blade die forging piece

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KR20050119802A (en) * 2004-06-17 2005-12-22 현대중공업 주식회사 Closed-die forging method and die of crank throw pintaper part
CN201170119Y (en) * 2008-03-21 2008-12-24 哈尔滨汽轮机厂有限责任公司 Full rotary speed air cooling steam turbine last stage blade
CN101758133A (en) * 2010-02-25 2010-06-30 无锡透平叶片有限公司 Edge flashing and off-clipping mechanism for large-blade die forging piece

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102162469A (en) * 2011-04-14 2011-08-24 四川振强模锻有限公司 Aluminum blade of fan and manufacturing technology thereof
CN104707926A (en) * 2013-12-12 2015-06-17 陕西宏远航空锻造有限责任公司 Molding and forging method of large arched forging stock
CN104707926B (en) * 2013-12-12 2017-01-04 陕西宏远航空锻造有限责任公司 A kind of large-scale arc forging stock molding forging method
CN104959505A (en) * 2015-07-22 2015-10-07 李孟平 Improved blade forging device and forging method thereof
CN105598350A (en) * 2015-12-28 2016-05-25 无锡透平叶片有限公司 Forging process for Nimonic101 alloy blade forging
CN105598350B (en) * 2015-12-28 2017-11-07 无锡透平叶片有限公司 A kind of forging technology of Nimonic101 alloy vanes forging
CN105499464A (en) * 2016-01-11 2016-04-20 无锡透平叶片有限公司 Steam turbine separation plate blade mold and designing method thereof
CN105499464B (en) * 2016-01-11 2018-11-09 无锡透平叶片有限公司 A kind of partition board of steam turbine blade mold and its design method
CN106378403A (en) * 2016-08-31 2017-02-08 无锡派克新材料科技股份有限公司 Switching section molding method
CN107282849A (en) * 2017-07-13 2017-10-24 安徽众鑫科技股份有限公司 A kind of automobile differential left half axle forging technology
CN111014553A (en) * 2019-12-06 2020-04-17 陕西宏远航空锻造有限责任公司 Forging method for controlling size angle of irregular triangular rough shape

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