CN109513866A - The extrusion forming method of nuclear power water chamber head - Google Patents

The extrusion forming method of nuclear power water chamber head Download PDF

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Publication number
CN109513866A
CN109513866A CN201811345763.4A CN201811345763A CN109513866A CN 109513866 A CN109513866 A CN 109513866A CN 201811345763 A CN201811345763 A CN 201811345763A CN 109513866 A CN109513866 A CN 109513866A
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CN
China
Prior art keywords
water chamber
nuclear power
chamber head
power water
extrusion forming
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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
Application number
CN201811345763.4A
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Chinese (zh)
Inventor
李向
黄健
董凯
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Shanghai Electric Heavy Forging Co Ltd
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Shanghai Electric Heavy Forging Co Ltd
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Publication date
Application filed by Shanghai Electric Heavy Forging Co Ltd filed Critical Shanghai Electric Heavy Forging Co Ltd
Priority to CN201811345763.4A priority Critical patent/CN109513866A/en
Publication of CN109513866A publication Critical patent/CN109513866A/en
Pending legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21JFORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/002Hybrid process, e.g. forging following casting
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21JFORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J1/00Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
    • B21J1/06Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations

Abstract

The present invention provides a kind of extrusion forming method of nuclear power water chamber head, and using Steel ingot feeder head is first pressed, the mode for then cutting T shoulder removes the defect at ingot body riser end;Blank heating to suitable temperature range and is kept the temperature, by carrying out the big forging ratio jumping-up of more fire time to blank, " WHF " forging method suppresses pulling and the integration of operation of " JTS " forging method center compacting, greatly improve blank internal performance quality, then excision blank riser and bottom deposit area defect, jumping-up modifies blank shape, is adapted blank diameter and extrusion die;By the way that blank is put into dedicated mold extrusion forming, the height profiling manufacture of " China's dragon No.1 " nuclear power water chamber head may be implemented in this method, it solves in " China's dragon No.1 " nuclear power water chamber head forming process, stock utilization is low, steel ingot weight, machining difficulty is big and working hour grows and metal flow technical problem rambunctious.

Description

The extrusion forming method of nuclear power water chamber head
Technical field
The present invention relates to metal material formings, and in particular to a kind of extrusion forming method of nuclear power water chamber head.
Background technique
" China's dragon No.1 " nuclear power water chamber head is also referred to as primary side end socket, steam generator lower head, is mounted on Nuclear Power Station Island component steam generator bottom is the channel of coolant disengaging steam generator in primary Ioops, is in steam generator Critical component.The design of part feature of " China's dragon No.1 " nuclear power water chamber head is as shown in Figure 1.The characteristics of water chamber head forging, is: Diameter is big (diameter >=3600mm), and wall thickness (wall thickness >=350mm), ozzle is more and complex-shaped, and (see Fig. 1) is simultaneously because be in In the environment of deep-etching and radiation, therefore it is also required to that there is good internal performance.
The manufacturing method of " China dragon No.1 " nuclear power water chamber head is broadly divided into three kinds: 1, all standing is machined after forming, and 2, imitative Shape flat anvil rotation is ground into shape, and 3, stamping.According to the shape of forging, in actual production, based on first two.Three kinds of forming arrangements It is low to there is stock utilization, steel ingot weight, the feature that machining difficulty is big and working hour is long.Currently on the market, the common system of pipe fitting The scheme of making is extrusion molding, more mature.There is material unevenness when extruding causes the metal flows such as thickness difference to control precision The problem of.
Summary of the invention
The technical problem to be solved by the present invention is to provide a kind of extrusion forming method of nuclear power water chamber head, solve " Hua Long In No.1 " nuclear power water chamber head forming process, stock utilization is low, steel ingot weight, and machining difficulty is big and working hour grows and metal stream Move technical problem rambunctious.
In order to solve the above technical problems, the present invention provides a kind of extrusion forming methods of nuclear power water chamber head, including with Lower step: Step 1: using first pressure-pad mouth, then remove the defect at ingot body riser end in a manner of cutting T shoulder;Step 2: into furnace It is kept the temperature, surface and the center portion temperature difference are not more than 50 DEG C;Then it comes out of the stove the side of pulling out, table temperature is cooled to 780 DEG C and does JTS forging;Step 3: It is kept the temperature into furnace, surface and the center portion temperature difference are not more than 50 DEG C;Then it comes out of the stove the jumping-up side of pulling out, table temperature is cooled to 780 DEG C or so and is JTS Forging;Step 4: being kept the temperature into furnace, surface and the center portion temperature difference are not more than 50 DEG C;Then jumping-up of coming out of the stove pulling, cleaning surface lack It falls into, cuts off Above The Ingot Bottom crystallizing field defect;It is kept the temperature Step 5: melting down, the round as a ball finishing forging stock shape of jumping-up and removing surface Trace cuts pincers handle, cuts average face;Step 6: being kept the temperature into furnace, surface and the center portion temperature difference are not more than 50~100 DEG C;Then go out Furnace descale, makes any surface finish, is finally putting into extrusion die drag chamber and is squeezed, and with squeezing, upper mold cooling 4.5 is small When after demoulded.
Preferably, T shoulder size is radially 100mm~200mm, and axial is 200mm~300mm.
Preferably, holding temperature range is 1200 DEG C~1260 DEG C.
Preferably, step 2 pulls out ratio >=2.5 to upsetting in five than 1.6~2.2 in step 3.
Preferably, lower die designs boss at corresponding water chamber head ozzle position, in extrusion process will be at boss Blank squeezes out blind hole, forms the ozzle of water chamber head;Lower die designs groove at lug boss position on the outside of the corresponding water chamber head, at Blank forms boss in extrusion process when shape, realizes that the profiling to boss on the outside of water chamber head manufactures.
Preferably, formation zone chamfered shape in upper mold lower part is identical as profile on the inside of nuclear power water chamber head forging, extrusion die 5 °~8 ° of upper mold drafting angle.
Preferably, in step 6, front upper and lower mould center alignment is squeezed, error is no more than ± 10mm.
Preferably, in step 6, lower die is combined type profile mould, and 100~200mm thickness steel wire winding can be used.
Preferably, it in step 6, is touched using fine iron chain and breaks forging or with high pressure spray mechanism of qi scale removal.
Preferably, the extrusion forming method of nuclear power water chamber head is for manufacturing " China's dragon No.1 " nuclear power water chamber head part.
Detailed description of the invention
Fig. 1 is " China's dragon No.1 " nuclear power water chamber head part schematic diagram.
Fig. 2 is in the extrusion forming method of nuclear power water chamber head of the invention by big forging ratio jumping-up, " WHF " of more fire time Forging method suppresses pulling and the integration of operation of " JTS " forging method center compacting carries out base schematic diagram.
Fig. 3 is extrusion die upper mold schematic diagram in the extrusion forming method of nuclear power water chamber head of the invention.
Fig. 4 is extrusion die lower die schematic diagram in the extrusion forming method of nuclear power water chamber head of the invention.
Fig. 5 is forging schematic diagram after shaping in the extrusion forming method of nuclear power water chamber head of the invention.
Specific embodiment
The present invention is matched using ten thousand tons of press and ten thousand tons of extruders, and assembly tooling and particular manufacturing craft, carries out blank pressure It is real, after clearing up surface, by the method for dedicated extruded mold extrusion molding, produce the forging (Fig. 1) for meeting size requirement.It should The height profiling manufacture of " China's dragon No.1 " nuclear power water chamber head may be implemented in method, solves in " China's dragon No.1 " nuclear power water chamber head In forming process, stock utilization is low, steel ingot weight, and machining difficulty is big and working hour is long and metal flow technology rambunctious is asked Topic.Using Steel ingot feeder head is first pressed, the mode for then cutting T shoulder removes the defect at ingot body riser end;By blank heating to suitable temperature Degree range is simultaneously kept the temperature, and by carrying out the big forging ratio jumping-up of more fire time to blank, " WHF " forging method suppresses pulling and " JTS " The integration of operation of forging method center compacting, greatly improves blank internal performance quality, then cuts off blank riser and bottom deposit Area's defect, jumping-up modify blank shape, are adapted blank diameter and extrusion die, and ratio of height to diameter of the ingot h/d≤2.6;Again will Blank heating is to suitable temperature range and is kept the temperature, after the upper and lower mould of extrusion die is carried out assembly adjustment alignment center, out Blank is put into extrusion die lower die by furnace, extrusion molding is carried out to blank by the extruding force of the upper and lower mould of extrusion die, by base Material is demoulded after being placed in extrusion die cooling 4~5h or so.
Specific step is as follows:
Step 1: using first pressure-pad mouth, then cut T shoulder mode (T shoulder size radial (100~200) × axial (200~ 300)) remove the defect at ingot body riser end;
Step 2: carrying out 1200~1260 DEG C of heat preservations into furnace, surface and the center portion temperature difference are not more than 50 DEG C;Then it comes out of the stove and pulls out Side, table temperature are cooled to 780 DEG C or so and do " JTS ";
Step 3: carrying out 1200~1260 DEG C of heat preservations into furnace, surface and the center portion temperature difference are not more than 50 DEG C;Then it comes out of the stove jumping-up The side of pulling out, table temperature are cooled to 780 DEG C or so and do " JTS " (upsetting pulls out ratio >=2.5 than 1.6~2.2);
Step 4: carrying out 1200~1260 DEG C of heat preservations into furnace, surface and the center portion temperature difference are not more than 50 DEG C;Then it comes out of the stove jumping-up Pulling is cleared up surface defect (upsetting is than 1.6~2.2), and Above The Ingot Bottom crystallizing field defect is cut off;
Step 5: melting down 1200~1260 DEG C of carry out heat preservations, the round as a ball finishing forging stock shape of jumping-up and removing surface trace, cut Handle is clamped, average face is cut;
Step 6: carrying out 1200~1260 DEG C of heat preservations into furnace, surface and the center portion temperature difference are not more than 50~100 DEG C;Then go out Furnace descale, makes any surface finish, is finally putting into extrusion die drag chamber and is squeezed, and with squeezing, the cooling 4.5h of upper mold is left It is demoulded behind the right side.
For the extrusion molding of realization " China's dragon No.1 " nuclear power water chamber head, a set of dedicated extrusion die is devised, is had There are following characteristics: (see Fig. 3, Fig. 4):
Consider that the thermal expansion coefficient of blank 1.01~1.02 designs corresponding die size in mold design;
Upper mold lower part formation zone chamfered shape is identical as profile on the inside of " China's dragon No.1 " nuclear power water chamber head forging, extrusion die 5 °~8 ° of upper mold drafting angle of tool;
Lower die is combined type profile mould, adopts a split structure design, is demoulded after assembling and complete convenient for mold.
Lower die designs boss (formed punch) at corresponding water chamber head ozzle position, in extrusion process by blank at boss Blind hole is squeezed out, the ozzle of water chamber head is formed;
Lower die designs groove on the outside of the corresponding water chamber head at lug boss position, blank is formed convex in extrusion process when forming Platform realizes that the profiling to boss on the outside of water chamber head manufactures;
To reduce cost, while increasing lower die intensity, cast sturcture substituted using steel wire winding about 100~200mm thickness, Increase safety coefficient.
Other control items:
1. blank pays attention to destruction of the jaw to forging after trimming, avoid repeatedly clamping same position;
2. squeezing front upper and lower mould is aligned center, axis based error is no more than ± 10mm;
3. using modes scale removals such as fine iron chain impact forging (or with high pressure spray mechanism of qi).
" Hua Long is developed in conjunction with extrusion forming method feature according to the shape feature of " China's dragon No.1 " nuclear power water chamber head The extrusion forming method of No.1 " nuclear power water chamber head, by tooling and particular manufacturing craft, blank is directly squeezed into after forging state compacting Shape, it is low to efficiently solve stock utilization, steel ingot weight, and machining difficulty is big and working hour is long and metal flow technology rambunctious is asked Topic.

Claims (10)

1. a kind of extrusion forming method of nuclear power water chamber head, which comprises the following steps:
Step 1: then removing the defect at ingot body riser end in a manner of cutting T shoulder using first pressure-pad mouth;
Step 2: being kept the temperature into furnace, surface and the center portion temperature difference are not more than 50 DEG C;Then it comes out of the stove the side of pulling out, table temperature is cooled to 780 DEG C and does JTS forging;
Step 3: being kept the temperature into furnace, surface and the center portion temperature difference are not more than 50 DEG C;Then it comes out of the stove the jumping-up side of pulling out, table temperature is cooled to 780 DEG C or so do JTS forging;
Step 4: being kept the temperature into furnace, surface and the center portion temperature difference are not more than 50 DEG C;Then jumping-up of coming out of the stove pulling, cleaning surface lack It falls into, cuts off Above The Ingot Bottom crystallizing field defect;
It is kept the temperature Step 5: melting down, the round as a ball finishing forging stock shape of jumping-up and removing surface trace cut pincers handle, cut average face;
Step 6: being kept the temperature into furnace, surface and the center portion temperature difference are not more than 50~100 DEG C;Then it comes out of the stove descale, makes surface It is bright and clean, it is finally putting into extrusion die drag chamber and is squeezed, demoulded with squeezing after upper mold cools down 4.5 hours.
2. the extrusion forming method of nuclear power water chamber head as described in claim 1, which is characterized in that T shoulder size is radially 100mm~200mm, axial is 200mm~300mm.
3. the extrusion forming method of nuclear power water chamber head as described in claim 1, which is characterized in that holding temperature range is 1200 DEG C~1260 DEG C.
4. the extrusion forming method of nuclear power water chamber head as described in claim 1, which is characterized in that upsetting ratio in step 2 to five 1.6~2.2, ratio >=2.5 are pulled out in step 3.
5. the extrusion forming method of nuclear power water chamber head as described in claim 1, which is characterized in that lower die is in corresponding water chamber envelope Boss is designed at head tube mouth position forms the pipe of water chamber head blank at boss is squeezed out blind hole in extrusion process Mouth;Lower die designs groove on the outside of the corresponding water chamber head at lug boss position, blank forms boss in extrusion process when forming, real Now the profiling of boss on the outside of water chamber head is manufactured.
6. the extrusion forming method of nuclear power water chamber head as described in claim 1, which is characterized in that upper mold lower part formation zone wheel Profile shape is identical as profile on the inside of nuclear power water chamber head forging, and 5 °~8 ° of extrusion die upper mold drafting angle.
7. the extrusion forming method of nuclear power water chamber head as described in claim 1, which is characterized in that in step 6, before extruding The alignment of upper and lower mould center, coaxiality error are no more than ± 20mm.
8. the extrusion forming method of nuclear power water chamber head as described in claim 1, which is characterized in that in step 6, lower die is 100~200mm thickness steel wire winding can be used in combined type profile mould.
9. the extrusion forming method of nuclear power water chamber head as described in claim 1, which is characterized in that in step 6, using thin Iron chains, which touches, breaks forging or with the methods of high pressure spray mechanism of qi scale removal.
10. the extrusion forming method of nuclear power water chamber head as described in claim 1, which is characterized in that nuclear power water chamber head Extrusion forming method can be used for manufacturing " China's dragon No.1 " nuclear power water chamber head part.
CN201811345763.4A 2018-11-13 2018-11-13 The extrusion forming method of nuclear power water chamber head Pending CN109513866A (en)

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CN102825187A (en) * 2011-06-17 2012-12-19 上海重型机器厂有限公司 Forging method for ellipsoidal head ring forge piece of third generation nuclear power plant steam generator
CN102825190A (en) * 2011-06-17 2012-12-19 上海重型机器厂有限公司 Method for forging and compacting thick tube plate of nuclear power equipment
CN104550589A (en) * 2013-10-15 2015-04-29 上海重型机器厂有限公司 Forging forming method of lower head forge piece for CAP1400 nuclear power pressurizer
CN206065162U (en) * 2016-08-25 2017-04-05 上海航天设备制造总厂 A kind of compressor wire winds liquid-filled chamber

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