CN108115111A - A kind of forming method of turbine runner blade - Google Patents
A kind of forming method of turbine runner blade Download PDFInfo
- Publication number
- CN108115111A CN108115111A CN201611073721.0A CN201611073721A CN108115111A CN 108115111 A CN108115111 A CN 108115111A CN 201611073721 A CN201611073721 A CN 201611073721A CN 108115111 A CN108115111 A CN 108115111A
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- CN
- China
- Prior art keywords
- blade
- green compact
- steel plate
- electroslag smelting
- smelting casting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D23/00—Casting processes not provided for in groups B22D1/00 - B22D21/00
- B22D23/06—Melting-down metal, e.g. metal particles, in the mould
- B22D23/10—Electroslag casting
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
A kind of forming method of turbine runner blade of the present invention, steel plate is used as raw material, molding blade green compact is prepared in electroslag smelting casting method, the envelope surface of runner bucket is generated by three-dimensional modeling, the upper and lower mould of pressure-shaped mould is prepared using Computerized Numerical Control processing technology according to envelope surface, skiving processing locally does steel plate according to envelope surface；It is distorted shape by steel plate hot forming；3 D intelligent expansion is carried out to blade using finite element analysis software, hot moulding blade mold and electroslag smelting casting blade green compact are made according to the blade profile size after expansion, electroslag smelting casting green compact is then heated to material normalizing temperature and is kept the temperature, electroslag smelting casting blade green compact hot-die is finally pressed into three-dimension curved surface blade using molding apparatus.The present invention has many advantages, such as to improve blade material utilization rate, reduces processing capacity, shortens the processing duration and improve blade mechanical property, particularly improves inherent quality and corrosion resistance；Allowance is small, has saved material, shortens the process-cycle, has saved energy consumption.
Description
Technical field
The invention belongs to the manufacturing technology fields of turbine runner blade, particularly relate to a kind of turbine runner blade
Forming method.
Background technology
Heart of the rotary wheel of water turbine as hydrogenerator is the key that the potential energy of water is converted to rotating mechanical energy portion
Part；In general, rotary wheel of water turbine is twisted into the blade of definite shape including one group, and it is arranged according to certain rules on runner shaft, water
Stream flows through blade surface, and impact runner rotates, so as to achieve the purpose that energy is converted；Prior art turbine runner blade uses
Forging type manufacture, often manufacture one piece of blade just need it is a set of pour mold, there are about 30~50 pieces of blades in a general power station, make
It is high to obtain die manufacturing cost, the production cycle is long；Turbine runner blade belongs to the large-scale plate steel-casting of three-dimensional twisted structure, is
Quality requirement highest, the representative casting of manufacture difficulty maximum in the hydraulic turbine；Runner bucket quality quality with molded line accurately with
It is no, directly affect efficiency, cavitation resistive property and the operation stability of runner.
The content of the invention
The present invention addresses the above problem, makes up the deficiencies in the prior art, provide a kind of turbine runner blade into
Type method.
To achieve the above object, the present invention adopts the following technical scheme that.
A kind of forming method of turbine runner blade of the present invention, it is characterised in that：Steel plate is used as raw material, with electroslag
Casting method prepares molding blade green compact, and the envelope surface of runner bucket is generated by three-dimensional modeling, is used according to envelope surface
Computerized Numerical Control processing technology prepares the upper and lower mould of pressure-shaped mould, and skiving processing is locally done to steel plate according to envelope surface；Steel plate is hot pressed into
Shape is distorted shape；3 D intelligent expansion is carried out to blade using finite element analysis software, according to the blade profile ruler after expansion
Very little making hot moulding blade mold and electroslag smelting casting blade green compact, are then heated to material normalizing temperature simultaneously by electroslag smelting casting green compact
Electroslag smelting casting blade green compact hot-die is finally pressed into three-dimension curved surface blade by heat preservation using molding apparatus.
As a preferred embodiment of the present invention, the above-mentioned steel plate used is stainless steel plate；Runner bucket can be increased
Corrosion resistance.
As another preferred embodiment of the present invention, green compact appearance and size is molded according to the blade of expansion, is returned with reference to blade
Bullet amount makes the hot-die compression mould of flexible adjustable.
As another preferred embodiment of the present invention, electroslag smelting casting blade green compact hot-die is pressed into three-dimensional using molding apparatus
The process of curved surface bucket is：Electroslag smelting casting blade green compact is placed on hot-die compression mould, be forced into upper/lower die gap≤
1.5mm, pressurize, dwell time determine that the i.e. dwell time is 4+ (0.02~0.04) h, wherein h according to the maximum gauge h of blade
Unit is mm, and dwell time unit is min.
As the present invention another preferred embodiment, between steel plate is placed on the upper and lower mould of pressure-shaped mould, be forced into,
Basic gapless between lower die and blade, pressurize to temperature drop to less than 350 DEG C.
Compared with prior art, present invention has the advantages that.
1st, the forming method of a kind of turbine runner blade disclosed in this invention, have improve blade material utilization rate,
Reduce processing capacity, shorten the processing duration and improve blade mechanical property, it is excellent particularly to improve inherent quality and corrosion resistance etc.
Point.
2nd, the present invention uses steel plate as raw material, and molding blade green compact, appearance and size and leaf are prepared in electroslag smelting casting method
Piece three-dimensional developed dimension near-net-shape makes hot moulding blade mold and electroslag smelting casting leaf according to the blade profile size after expansion
Electroslag smelting casting green compact is then heated to material normalizing temperature and kept the temperature by piece green compact, finally utilizes molding apparatus by electroslag smelting casting
Blade green compact hot-die is pressed into three-dimension curved surface blade；It is only processed a little by the blade blank after above-mentioned hot moulding and just may conform to leaf
The requirement of piece finishing size, allowance is small, has saved material, shortens the process-cycle；Due to conventional turbine blade just
Ignition technique is typically also the held for some time between 1100-1200 DEG C, therefore, by the heating of electroslag smelting casting blade green compact, is protected
Normalizing effect is played while warm, a subsequent normalizing heat treatment procedure can be reduced, saved energy consumption；Compare conventional cast
Blade and steel plate molding blade, using the blade interior good quality of the method for the invention production, shorten the production cycle, drop
Low allowance, mechanical property are improved significantly.
Specific embodiment
A kind of forming method of turbine runner blade of the present invention, it is characterised in that：Steel plate is used as raw material, with electroslag
Casting method prepares molding blade green compact, and the envelope surface of runner bucket is generated by three-dimensional modeling, is used according to envelope surface
Computerized Numerical Control processing technology prepares the upper and lower mould of pressure-shaped mould, and skiving processing is locally done to steel plate according to envelope surface；Steel plate is hot pressed into
Shape is distorted shape；3 D intelligent expansion is carried out to blade using finite element analysis software, according to the blade profile ruler after expansion
Very little making hot moulding blade mold and electroslag smelting casting blade green compact, are then heated to material normalizing temperature simultaneously by electroslag smelting casting green compact
Electroslag smelting casting blade green compact hot-die is finally pressed into three-dimension curved surface blade by heat preservation using molding apparatus.
As a preferred embodiment of the present invention, the above-mentioned steel plate used is stainless steel plate；Runner bucket can be increased
Corrosion resistance.
As another preferred embodiment of the present invention, green compact appearance and size is molded according to the blade of expansion, is returned with reference to blade
Bullet amount makes the hot-die compression mould of flexible adjustable.
As another preferred embodiment of the present invention, electroslag smelting casting blade green compact hot-die is pressed into three-dimensional using molding apparatus
The process of curved surface bucket is：Electroslag smelting casting blade green compact is placed on hot-die compression mould, be forced into upper/lower die gap≤
1.5mm, pressurize, dwell time determine that the i.e. dwell time is 4+ (0.02~0.04) h, wherein h according to the maximum gauge h of blade
Unit is mm, and dwell time unit is min.
As the present invention another preferred embodiment, between steel plate is placed on the upper and lower mould of pressure-shaped mould, be forced into,
Basic gapless between lower die and blade, pressurize to temperature drop to less than 350 DEG C.
The specific forming method following steps of turbine runner blade of the present invention：（1）Runner blade is generated by three-dimensional modeling
The envelope surface of piece；（2）The upper and lower mould of pressure-shaped mould is prepared using Computerized Numerical Control processing technology according to envelope surface；（3）By the bag of uniform thickness
Network curved surface makees three-dimensional expansion, determines blank size and shape；（4）Skiving processing locally does steel plate according to envelope surface；（5）It will
Steel plate is heated to 1050 DEG C ± 10 DEG C, keeps the temperature 8~15 minutes；（6）Between steel plate is placed on the upper and lower mould of pressure-shaped mould, add
Basic gapless between upper and lower mould and blade is depressed into, pressurize to temperature drops to 680 DEG C or more；（7）Mold is opened, taking-up is hot pressed into
Shape part；（8）Steel plate is again heated to 1110 DEG C ± 20 DEG C, keeps the temperature 10~18 minutes；（9）Steel plate is placed on pressure-shaped mould
Between upper and lower mould, basic gapless between upper and lower mould and blade is forced into, pressurize to temperature drops to less than 400 DEG C；（10）Release,
Check blade and die clearance, it is desirable that≤1.5mm；（11）Hot forming part is taken out, carrying out subsequent mechanical to hot forming part adds
Work is examined, storage.
It is understood that above with respect to the specific descriptions of the present invention, it is merely to illustrate the present invention and is not limited to this
The described technical solution of inventive embodiments, it will be understood by those of ordinary skill in the art that, still the present invention can be carried out
Modification or equivalent substitution, to reach identical technique effect；As long as meeting using needs, all protection scope of the present invention it
It is interior.
Claims (5)
1. a kind of forming method of turbine runner blade, it is characterised in that：Steel plate is used as raw material, in electroslag smelting casting method
Molding blade green compact is prepared, the envelope surface of runner bucket is generated by three-dimensional modeling, digital control processing is used according to envelope surface
Technology prepares the upper and lower mould of pressure-shaped mould, and skiving processing is locally done to steel plate according to envelope surface；It is distortion by steel plate hot forming
Shape；3 D intelligent expansion is carried out to blade using finite element analysis software, heat is made according to the blade profile size after expansion
Blade mold and electroslag smelting casting blade green compact are molded, electroslag smelting casting green compact is then heated to material normalizing temperature and is kept the temperature, most
Electroslag smelting casting blade green compact hot-die is pressed into three-dimension curved surface blade using molding apparatus eventually.
2. a kind of forming method of turbine runner blade according to claim 1, it is characterised in that：The steel plate is
Stainless steel plate.
3. a kind of forming method of turbine runner blade according to claim 1, it is characterised in that：According to the leaf of expansion
Piece is molded green compact appearance and size, with reference to blade springback capacity, makes the hot-die compression mould of flexible adjustable.
4. a kind of forming method of turbine runner blade according to claim 1, it is characterised in that：Utilize molding apparatus
The process that electroslag smelting casting blade green compact hot-die is pressed into three-dimension curved surface blade is：Electroslag smelting casting blade green compact is placed on hot moulding
On mold, upper/lower die gap≤1.5mm, pressurize are forced into, the dwell time determines according to the maximum gauge h of blade, i.e. pressurize
Time is 4+ (0.02~0.04) h, and wherein h unit is mm, and dwell time unit is min.
5. a kind of forming method of turbine runner blade according to claim 1, it is characterised in that：Steel plate is placed on
Between the upper and lower mould of pressure-shaped mould, basic gapless between upper and lower mould and blade is forced into, pressurize to temperature drops to less than 350 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611073721.0A CN108115111A (en) | 2016-11-29 | 2016-11-29 | A kind of forming method of turbine runner blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611073721.0A CN108115111A (en) | 2016-11-29 | 2016-11-29 | A kind of forming method of turbine runner blade |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108115111A true CN108115111A (en) | 2018-06-05 |
Family
ID=62226823
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611073721.0A Pending CN108115111A (en) | 2016-11-29 | 2016-11-29 | A kind of forming method of turbine runner blade |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108115111A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109108577A (en) * | 2018-08-28 | 2019-01-01 | 浙江众立机械制造有限公司 | Propeller producing process based on hot investment casting |
-
2016
- 2016-11-29 CN CN201611073721.0A patent/CN108115111A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109108577A (en) * | 2018-08-28 | 2019-01-01 | 浙江众立机械制造有限公司 | Propeller producing process based on hot investment casting |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180605 |
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| WD01 | Invention patent application deemed withdrawn after publication |