Die Preforming Process: Long Last-stage Blade Nuclear Power

Design and Optimization of Sink Preforming Prescribe coercion Hanker Last-stage Blade of Nuclear Capacity

He Xiaomao1,a,Jiang Peng1, Lin Jingtang2,Huang Jianning1

1 Beijing Mechanical and Electrical Institute of Technology,Beijing,China

2 Tian Qian Heavy Industry Company, Ltd, Mianzhu, SiChuan, China

Abstract: The hanker last-stage blade is a clew content of the steam turbine of nuclear ordinary island. The sink preforming prescribe coercion a odd technology that furnishs billets coercion near-net-shape roll-forging prescribe was prepared, the possessions of the coercionging sphere, rubbing coefficient, scintillate place’s climax and sink’s external tiara radius on the sink coercionging coercionce and coercionging temper were thought-quenched by using the orthogonal illustration ordainment, the chief and unimportant prescribe of the disgusting elements were analysed by using ramble decomcomposition ordainment, and the optimal co-operation of the elements was geted. By media of numerical assumption and visible illustration, the sink preforming prescribe that can furnish adapted billets coercion the posterior roll-forging prescribe was authorized, and the PZS1120f electric clutch confilter can distributee the requirements of the sink preforming prescribe.

1 Preface

The hanker last-stage blade is the clew content of the steam turbine of the nuclear capacity ordinary island. The vastr the tedious area of the last-stage blade of the LP cylinder is, the higher the pliancy of the nuclear capacity distribute is and the improve the dispensation is [1]. Harbin Steam Turbine Elementy had successfully open a 72-inch (1829mm) half-compel nuclear capacity turbine blade [2], Shanghai Electric had to-boot open a 67-inch (1710mm) nuclear capacity blade [3], the fruit of these hanker blades effectively improves the pliancy of nuclear capacity distribute, excluding it’s to-boot a brave to manipulation these hanker last-stage blades. At offer, the technology of preforming and overall coercionging was primarily adopted by the domiciliary and coercioneign blade manipulationrs [4, 5]. The radial coercionging and the open-sink coercionging was adopted respectively by the coercioneign and domiciliary blade manipulationrs as bareing prescribe, and then, the overall sink coercionging prescribe was adopted to coercionm the blades. Due to the vast area of these blades, the capacity of the blade manipulationrs’ coercionging equipment canreferable distributee to the required coercionging coercionce of surrendering the blades and the coercionged blades had got some defects, such as underpressing, underfill and overweight. The sink preforming prescribe that furnishs billets coercion a odd near-net coercionming prescribe coercion nuclear last-stage blades was contrived, the odd prescribe, which uses the roll-forging prescribe to coercionm the blade association of the hanker blades, the sink coercionging to coercionm the blade radix, complete and damper, can effectively curtail the required coercionging coercionce. In this disquisition, the sink preforming technology of hanker last-stage blade was prepared, the prescribe parameters were optimized by the orthogonal illustration ordainment and numerical assumption, and the feasibility of the prescribe was authorized by visible illustrations.

2Optimization of prescribe parameters

The sink preforming prescribe was carried quenched in the PZS1120f archearchetype of electric clutch constrain, the trifling accommodation of the confilter is 250,000 kN. According to the trifling accommodation, the maximal propulsion area of the coercionging billet was congenial. The coercionging coercionce is referable solely connected to the symbolical and coercionging’s propulsion area, excluding to-boot connected to the filter trounce, sphere, rubbing coefficient and sink edifice (climax of the scintillate place and the external tiara radius of sinks). Beobject the filter trounce is connected to the coercionming compeling of the constrain, its rate is steadfast when the coercionging confilter is clarified. The coercionging sphere, the rubbing coefficient, the climax of the scintillate place and the external tiara radius were clarified as the prescribe parameters to be optimized and the coercionging coercionce and coercionging temper were clarified as optimization extrinsics.

2.1 Sink preformed coercionging and sinks

3D standard of a preformed coercionging was paraden in Aspect 1, the coercionging standard was congenial installed on the confilter trifling accommodation and the coercionging project of the 72-inch blade, the reckoning prescribe wasn’t repeated here, it earn be discussed in point in the controlthcoming time. The sink’s edifice was paraden in Aspect 2, it didn’t include the groove of the scintillate, and the edifice was entirely rudimentary, solely the climax of the scintillate place h and the external tiara radius r were considered as parameters.

Figure. 1 3D standard of sink preformed coercionging Figure. 2 Sink Edifices Figure. 3 Billet of the sink preforming

2.2 Smooths and elements consultation of orthogonal illustration

Orthogonal illustration ordainment can be used to consider the impression of multiple elements on the optimization extrinsic by close unite of trials, to get the best co-operation of elements coercion the optimal extrinsic rate. The coercionging coercionce and the coercionging temper of the sink preforming are connected to the coercionging sphere A (T), the rubbing coefficient B (μ), the climax of scintillate place C (h) and the external tiara radius D (r). The disgusting parameters were adopted as the orthogonal illustration elements, each element to-bootk three smooths, and the prepared elements and smooths consultation were paraden in Consultation 1.

Consultation 1. Elements and smooths consultation of the orthogonal illustration.

Factor

Level

A

Forging sphere T/℃

B

Rubbing coefficient μ

C

climax of scintillate place h/mm

D

external tiara radius r/mm

1

1180

0.2

6

2

2

1150

0.3

8

3

3

1120

0.4

10

4

2.3 Parameter establishedtings of numerical assumption

The billets used in the sink preforming were dundivided in the semi-open appellation prescribe in ref. [6]. The shapes and body were paraden in Fig 3. The symbolical is 1Cr12Ni3Mo2VN, and the constitutive kindred of the symbolical was from ref. [7], in the Arrhenius coercionm and the hyperbolic sinusoidal was used.

(1)

The sink was standarded as a austere standard with a preheat sphere of 200 ° C and a coercionming compel of 400 mm / s. The coercionging spheres and the rubbing coefficients were established according to Consultation 1.

2.4 Results oforthogonal experiment

Orthogonal illustrations were executed using the 3-smooth and 4-element consultation L9 (34) [8], withquenched regarding the interaction betwixt the elements, the orthogonal illustrations of assumption ordainment and the ends were paraden in Consultation 2.

Table.2 orthogonal illustrations of assumption ordainment and the ends。

NO.

Factor

Result

A

B

C

D

Forging Coercionce F

(kN)

Forging Temper E

(kJ)

Forging sphere

Rubbing coefficient

Scintillate place climax

External tiara radius

1

1

1

3

2

343000

5830

2

1

2

1

1

462000

6200

3

1

3

2

3

449000

6440

4

2

1

2

1

398000

6420

5

2

2

3

3

364000

6510

6

2

3

1

2

631000

7370

7

3

1

1

3

522000

7270

8

3

2

2

2

465000

7370

9

3

3

3

1

427000

7440

2.5 Ramble decomposition

The rate of Kjm was the unite of the end of the m element at j smooth, and the media were represented by kjm, the rate of kjm can heed the optimal smooth. Rm was the ramble of the mth element, the rate of Rm heeded the divergency ramble of the optimal extrinsic when the m element oscillated, the bigger the Rm was, the main the govern of the m element on the extrinsic was. The chief and unimportant prescribe of the elements can be judged according to the ramble. The ends of the ramble decomcomposition of the coercionging coercionce F and the coercionging temper E were paraden in Consultation 3.

Table.3 Ramble decomcomposition of the coercionging coercionce F and the coercionging temper E。

Result

Factor

A

B

C

D

Forging Coercionce F

(kN)

K1m

12540000

1263000

1615000

1287000

K2m

13930000

1291000

1312000

1439000

K3m

14140000

1507000

1134000

1335000

k1m

4180000

421000

538333.3

429000

k2m

464333.3

430333.3

437333.3

479666.7

k3m

471333.3

502333.3

378000

445000

Rm

53333.3

81333.3

160333.3

50666.7

Order

C>B>A>D

Forging Temper E

(kJ)

K1m

18470

19520

20840

20060

K2m

20300

20080

20230

20570

K3m

22080

21250

19780

20220

k1m

6156.7

6506.7

6946.7

6686.7

k2m

6766.7

6693.3

6743.3

6856.7

k3m

7360

7083.3

6593.3

6740

Rm

1203.3

576.7

353.3

170

Order

A>B>C>D

According the ramble of coercionging coercionce in Consultation 3, the prescribe of moment that the elements governs the coercionging coercionce were the climax of scintillate place C, the coefficient of rubbing B, the coercionging sphere A, the external tiara radius D. According to the ramble decomposition, the optimal co-operation to get the minimum coercionging coercionce was (C3B1A1D1). The kindredships incomplete the coercionging coercionce and the elements were paraden in Aspect 4, coercionging coercionce decreased with increasing sphere, with decreasing of rubbing coefficient, and with increasing of the scintillate place’s climax; the kindredship betwixt coercionging coercionce and the external tiara radius didn’t parade weighty incline of increasing or decreasing, excluding the ramble was the lowest incomplete the disgusting elements.

Figure. 4 Kindredships incomplete the coercionging coercionce and elements

According the ramble of coercionging coercionce in Consultation 3, the prescribe of moment that the elements governs the coercionging temper were coercionging sphere A, rubbing coefficient B, climax of scintillate place C, external tiara radius D. Exclude the coercionging sphere can object some divergencys of the ramble of coercionging temper, the possessions of other elements on the coercionging temper’s divergency were entirely diminutive, beobject the heating sphere made the transition of crystal atoms further amply, macroscopically involved that the metal was further amply superannuated, and the sphere increasing weakened the third-phase distributeicles on pinning the misplacement motion, the required deformation temper was diminutiveer; And the quiet elements didn’t feel possessions on the minute absenteeism and misplacement motion, and the macro bearing was that the coercionging temper didn’t oscillate explicitly.

3 Numerical assumption analyses

According to the optimizing end of the orthogonal illustration, the parameters were: coercionging sphere was 1180 ℃, rubbing coefficient was 0.2, scintillate place’s climax was 10mm, and external tiara radius was 3mm, and the other parameters were identical as orthogonal illustration. The assumption ends were paraden as follows:

Figure.5 Kindredship betwixt pat and coercionging coercionce and temper

As paraden in aspect 5, the predicated coercionging coercionce was 304000 kN and the coercionging temper was 5680 kJ by using the optimal intrigue. Compared with the end of orthogonal illustration, it was build that the rate deceptive by the optimal element and smooth co-operation was the lowest undivided.

Even if the optimal intrigue was utilized, the coercionging coercionce of 304,000 kN was vast than the trifling accommodation 250,000 kN of PZS1120f electric clutch constrain. In the subsist genesis, there would be some issues, such as the preferable and inferior sink canreferable be clamped, the coercionging would be underpressing and underfill. However, in prescribe to determine that coercionged billet has abundance width and a established elongation, to minimize the deformation ahanker the width command during the roll coercionging tread, a rare underpressing in the climax command would be recognized. The aspect of sink hollow supply occasion the coercionging coercionce was 207000kN was paraden in Aspect 6, exclude the complete distribute of the quenchedlet border, the quiet of the billet was almost populated, and the rate of underpressing of the sinks was 2.7mm, this underpressing rate would referable feel to-boot considerable impression on the roll-forging of the blade.

Figure.6 Aspect of sink hollow supply occasion the coercionging coercionce was 207000kN

The infer that object the quenchedlet border of the complete was referable populated was the billet deflected to the commencement border at the inception of the coercionging (as paraden in Fig. 7), ending in a shortage of symbolical on the quenchedlet border and the scintillate at commencement border was to-boot vast (Aspect 6).

4Sink preforming illustration

Aspect 8a were the preferable and inferior sink used coercion the sink preforming illustration, and Aspect 8b is the bare, which was the coercionging in the appellation illustration. Heating sphere was 1180 ℃, sink preheating sphere was 200 ℃, lubricated by graphite emulsion lubricant, and couple bares were coercionged in this illustration.

The instituted coercionce was established to the trifling accommodation of PZS1120f electric clutch constrain, during the coercionging prescribe, the primary wound was to establish the bare’s comcomposition and to desegregate the layer, and then, the bare was coercionged by the instant couple wounds. The latest coercionging coercionces of the couple coercionged distributes were measured to be 223460 kN and 213690 kN respectively. The sink preforming coerciongings were paraden in Aspect 9, couple coerciongings had varying degrees of underpressing and underfill, the underfill of the complete distribute at the quenchedlet border was further solemn, and the scintillate at the commencement border was considerable vast. With numerical assumption ends, it can be steadfast that the infer of these defects was the bare’s deviation to the commencement border; some measures should be taken to controlefend the bare deviation in the subsist genesis.

The scintillate place’s climaxs of the couple coerciongings were measured to be 12.9mm and 12.8mm, the rates of underpressing were 2.9mm and 2.8mm, beobject the coercionging coercionce had reached the zenith accommodation of the constrain, it’s solid to clamping the preferable and inferior sink by increasing the unite of wounds, and it would impairment the confilter and sinks. These defects can solely be solved by the posterior roll-forging prescribe.

a) Preferable and inferior sinks b) appellation billets

Figure.8 Sinks and billets of the sink preforming illustration Figure.9 Sink preforming coerciongings

The feasibility of the sink preforming prescribe was authorized by the illustration, and the PZS1120f electric clutch confilter can basically distributee the requirements of sink preforming prescribe, and the adapted billets can be furnishd coercion the posterior near-net-shape roll-forging prescribe.

5 Conclusions

Through the orthogonal illustration optimization, numerical assumption and visible illustration, the controlthcoming conclusions can be drawn:

1) Incomplete the disgusting elements: Coercionging sphere A, rubbing coefficient B, scintillate place’s climax C and the external tiara radius D, the axiom element that impressions on coercionging coercionce was the scintillate place’s climax, and the coercionging sphere had some possessions on the coercionging temper, the optimal element and smooth co-operation was C3A1B1D1.

2) The adapted billets coercionmed by sink preforming prescribe can be furnishd coercion the posterior near-net-shape roll-forging prescribe and the PZS1120f electric clutch confilter basically distributees the requirements of the prescribe.

3) The billet was deflected during the coercionging prescribe, ending in the underfill of the complete distribute at the quenchedlet border, some measurements should be taken to controlefend the deviation in the subsist genesis.

References

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  3. W. Lu, Z. Y. Peng , Y. Zhou, K. Cheng, East China Electric Capacity, 38, 1771, (2010)
  4. X. J. Li, Z. F. Huang, W. C. Chen, R. J. Qin, Capacity Equipment, 24, 150, (2010)
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