CN109513865B

CN109513865B - Forging forming method for water chamber end socket with side nozzle

Info

Publication number: CN109513865B
Application number: CN201811345735.2A
Authority: CN
Inventors: 朱洪洋; 董凯; 黄健
Original assignee: Shanghai Electric Shmp Casting & Forging Co ltd
Current assignee: Shanghai Electric Shmp Casting & Forging Co ltd
Priority date: 2018-11-13
Filing date: 2018-11-13
Publication date: 2020-09-08
Anticipated expiration: 2038-11-13
Also published as: CN109513865A

Abstract

The invention provides a forging forming method of a water chamber end socket with a side nozzle, which comprises the following steps: step one, compacting; firstly, carrying out heat cutting to reduce weight, then carrying out heat preservation in a furnace, compacting, then returning to the furnace, heating, carrying out two-heading and two-drawing, wherein the axial forging ratio is more than or equal to 3; step two, material distribution; carrying out sectional profiling on the blank after the first step, dividing the blank into a side tube mouth part and a bowl-shaped main body part, drawing out the side tube mouth part to be long, marking five surfaces and two half surfaces, then carrying out staggered square drawing, and finally rounding the rest octagonal part; thirdly, the bowl-shaped main body part is rotationally ground, the bowl-shaped main body part is completed by using the profiling flat anvil and the special lower die, and meanwhile, the shape of the side nozzle part is not damaged; and step four, carrying out twice normalizing and once tempering treatment on the heat treatment after forging to obtain the forged piece. By the method, a welding seam when the connecting pipe is manufactured separately and welded together finally is directly reduced, the manufacturing cost is reduced, and the safety factor of the whole part is improved.

Description

Forging forming method for water chamber end socket with side nozzle

Technical Field

The invention relates to the field of casting, in particular to a forging and forming method of a water chamber end socket with a side nozzle.

Background

With the development of nuclear power technology, forgings for nuclear power stations are continuously developed towards integration and miniaturization. In a nuclear power steam generator, a water chamber end socket is an important part in the whole part and plays a role of a solution circulation exchange valve. Because the water chamber end socket is in the working environment, the design side considers the aspects of safety, manufacturing and the like, in the design of the latest steam generator component, the connecting pipe and the water chamber end socket are integrated together to form a water chamber end socket forge piece with an asymmetric side nozzle to reduce welding seams and increase the safety factor of the whole component.

The water chamber end socket with the side nozzle has the following remarkable characteristics: the water chamber sealing head has asymmetric side pipe nozzles and low bowl-shaped part height, so that the possibility of stamping and forming is limited. Furthermore, forging in a fully covered manner can result in significant material waste, which is generally not a concern. In conclusion, the forging of the water chamber end socket with the side nozzle has higher difficulty.

Disclosure of Invention

The invention aims to provide a method for effectively solving the problem of manufacturing a water chamber end socket with an asymmetric side nozzle from nothing to nothing.

In order to solve the technical problem, the invention provides a forging forming method of a water chamber end socket with a side nozzle, which comprises the following steps: step one, compacting; firstly, carrying out heat cutting to reduce weight, then carrying out heat preservation in a furnace, compacting, then returning to the furnace, heating, carrying out two-heading and two-drawing, wherein the axial forging ratio is more than or equal to 3; step two, material distribution; carrying out sectional profiling on the blank after the first step, dividing the blank into a side tube mouth part and a bowl-shaped main body part, drawing out the side tube mouth part to be long, marking five surfaces and two half surfaces, then carrying out staggered square drawing, and finally rounding the rest octagonal part; thirdly, the bowl-shaped main body part is rotationally ground, the bowl-shaped main body part is completed by using the profiling flat anvil and the special lower die, and meanwhile, the shape of the side nozzle part is not damaged; and step four, carrying out twice normalizing and once tempering treatment on the heat treatment after forging to obtain the forged piece.

Preferably, the temperature range of the furnace entering heat preservation in the step one is 1150-1250 ℃.

Preferably, in the second step, the depth of the mark is 500 mm.

Preferably, in the second step, the anvil feeding amount is 300mm each time, and the rolling reduction amount is 150 mm.

Preferably, in the fourth step, the temperature range of the normalizing treatment is 900-990 ℃.

Preferably, in the fourth step, the temperature range of the tempering treatment is 600 ℃ to 700 ℃.

Preferably, in the second step, a ten thousand ton press and a special tool auxiliary tool are assembled for sectional forming.

Drawings

FIG. 1 is a drawing of a forging using the water chamber end enclosure with side nozzles of the present invention.

FIG. 2 is a schematic diagram of the number stamp division of the forging forming method of the water chamber end socket with the side nozzle of the invention.

FIG. 3 is a schematic sectional forming view of the forging forming method of the water chamber end socket with the side nozzle of the invention.

FIG. 4 is a schematic view of a profiling flat anvil in the forging forming method of the water chamber end socket with the side nozzle.

FIG. 5 is a schematic view of a profiling lower die in the forging forming method of the water chamber end socket with the side nozzle of the invention.

Detailed Description

The invention provides a sectional profiling forming method for completing forging forming of a water chamber end socket with an asymmetric side nozzle.

Firstly, compacting; as the bottom of the asymmetric side nozzle and the bottom of the water chamber end enclosure are integrally molded and the side nozzle is solid (as shown in figure 1), the wall of the asymmetric side nozzle and the bottom of the water chamber end enclosure are thick, and a large steel ingot needs to be deformed greatly to break up metallurgical defects. Firstly, reducing weight of a hot cutting handle, then keeping the temperature of 1150-1250 ℃ in a furnace, performing JTS (joint test system) on the steel pipe till 2300mm, then returning the steel pipe to the furnace for heating, performing two-heading and two-drawing, wherein the axial forging ratio is more than or equal to 3.

Secondly, distributing materials; the following two problems exist during material distribution:

1. the side nozzle portion and the main body portion are different in center;

2, the bowl-shaped main body part needs to be pressed into a round shape, and the side nozzle part needs to be pressed into a square shape;

the blank is firstly drawn into a length of about 3485mm with a #3000mm, five sides and two half sides of the mark with a mark depth of about 500mm (as shown in figure 2), then staggered drawing (about 1620mm 1770mm 4060mm) is carried out according to the anvil feeding amount of 300mm and the rolling amount of about 150mm, and finally the residual octagonal part is rounded to-phi 3000mm 1770mm (as shown in figure 3).

Thirdly, finishing the bowl-shaped main body part by rotationally grinding; a contoured anvil (as shown in fig. 4) and a special lower die (as shown in fig. 5) are designed to complete the "bowl" shaped body portion without destroying the shape of the asymmetric side nozzle.

And fourthly, performing 900-990 ℃ normalizing and 600-700 ℃ tempering twice after the post-forging heat treatment to obtain a blank state with good shape and internal structure.

The invention solves the forging problem of the water chamber end socket with the asymmetric side nozzle.

By adopting a compaction scheme of two upsetting, two drawing and one JTS, the nozzle part and the bowl-shaped main body part are subjected to sectional profiling, the main body part is subjected to rotary grinding and is subjected to finish forming, and a two-positive-one-time forging post-treatment mode can provide a forging blank with good size and internal organization, so that the forging problem of the water chamber end socket with the asymmetric nozzle is solved.

The invention discloses a sectional profiling forming method of a water chamber end socket with a side nozzle, which is developed by considering the material utilization rate and combining the production capacity of a factory according to the shape characteristics of the water chamber end socket with the side nozzle. By the method, a welding seam when the connecting pipe is manufactured separately and welded together finally is directly reduced, the manufacturing cost is reduced, and the safety factor of the whole part is improved. The manufacturing problem of the water chamber end socket with the asymmetric side pipe nozzle from nothing to now is effectively solved.

Claims

1. A forging forming method for a water chamber end socket with a side nozzle is characterized by comprising the following steps:

step one, compacting; firstly, carrying out heat cutting to reduce weight, then carrying out heat preservation in a furnace, compacting, then returning to the furnace, heating, carrying out two-heading and two-drawing, wherein the axial forging ratio is more than or equal to 3;

step two, material distribution; carrying out sectional profiling on the blank after the first step, dividing the blank into a side tube mouth part and a bowl-shaped main body part, drawing out the side tube mouth part to be long, marking five surfaces and two half surfaces, then carrying out staggered square drawing, and finally rounding the rest octagonal part;

thirdly, the bowl-shaped main body part is rotationally ground, the bowl-shaped main body part is completed by using the profiling flat anvil and the special lower die, and meanwhile, the shape of the side nozzle part is not damaged;

and step four, carrying out twice normalizing and once tempering treatment on the heat treatment after forging to obtain the forging with the side nozzle water chamber end enclosure.

2. The forging and forming method of the water chamber end socket with the side nozzle according to claim 1, wherein the temperature range of the furnace entering and heat preservation in the first step is 1150-1250 ℃.

3. The forging and forming method of the water chamber end socket with the side nozzle of claim 1, wherein in the second step, the depth of the mark is 500 mm.

4. The forging and forming method of the water chamber end socket with the side nozzle of claim 1, wherein in the second step, the anvil feeding amount is 300mm each time, and the rolling reduction amount is 150 mm.

5. The forging and forming method of the water chamber end socket with the side nozzle of claim 1, wherein in the fourth step, the temperature range of the normalizing treatment is 900-990 ℃.

6. The forging and forming method of the water chamber end socket with the side nozzle of claim 1, wherein in the fourth step, the temperature range of the tempering treatment is 600 ℃ to 700 ℃.

7. The forging and forming method of the water chamber end socket with the side nozzle of claim 1, wherein in the second step, a ten thousand ton press is adopted and a special tool and an auxiliary tool are assembled for sectional forming.