CN106238659B

CN106238659B - A kind of large electric power plant rotor forging technology

Info

Publication number: CN106238659B
Application number: CN201610706852.1A
Authority: CN
Inventors: 葛艳明; 王远林; 沈益新
Original assignee: Jiangsu Jinyuan High-End Equipment Co Ltd
Current assignee: Jiangsu Jinyuan High-End Equipment Co Ltd
Priority date: 2016-08-24
Filing date: 2016-08-24
Publication date: 2018-08-14
Anticipated expiration: 2036-08-24
Also published as: CN106238659A

Abstract

The present invention relates to a kind of large electric power plant rotor forging technologies, it is characterised in that：Include the following steps：1) for the first fire by blank Heating Steel Ingots to 1200~1220 DEG C, chamfered edge keeps the temperature 6 hours；2) the convex recessed swage block of circular arc dentation is used, to 1) step obtain blank material jumping-up, dial it is long, then use air blast water spray square billet is as cold as by force to 800 DEG C, it is pressed one time by 1-2-3-4 sequences using the convex recessed swage block of circular arc dentation, 90 ° of overturning sequence pressure one time again；3) 2) blank material that step is obtained, it is heated to 880~900 DEG C of recrystallization temperature, using the convex recessed swage block jumping-up of circular arc dentation, it dials long, it is furnace-cooled to 320~350 DEG C of temperature range later and keeps the temperature 2 3h, it is heated to 680~700 DEG C of temperature range later and keeps the temperature 18~20h, is furnace-cooled to 150 DEG C and comes out of the stove.The product of the technique productions has internal modification uniform, and residual stress is small, and crystal grain refinement eliminates internal flaw, and the intensity and toughness of forging greatly improved.

Description

A kind of large electric power plant rotor forging technology

Technical field

The invention belongs to technical field of forging more particularly to a kind of large electric power plant rotor forging technologies.

Background technology

It is generally known that large electric power plant rotor will bear the centrifugal force of high speed rotation generation under high temperature operation and transmit torque The bending stress generated with dead weight requires rotor to have intensity height, good toughness, structure property such complicated working condition is small Uniformly, residual stress is small etc..Forging technology traditional at present has the drawback that stress concentration, rotor center area horizontal plastic property are low It is higher with brittle transition temperature, it be easy to cause rotor rupture.

Invention content

In order to solve the above-mentioned technical problem the purpose of the present invention, provides a kind of large electric power plant rotor forging technology, including with Lower step：1) for the first fire by blank Heating Steel Ingots to 1200 ~ 1220 DEG C, chamfered edge keeps the temperature 6 hours；2) use circular arc dentation convex Recessed swage block, to 1) step obtain blank material jumping-up, dial it is long, then use air blast water spray square billet is as cold as by force to 800 DEG C, using circular arc The convex recessed swage block of dentation is pressed one time by 1-2-3-4 sequences, 90 ° of overturning sequence pressure one time again；3) 2) base that step is obtained Material is heated to 880 ~ 900 DEG C of recrystallization temperature, using the convex recessed swage block jumping-up of circular arc dentation, dials long, is furnace-cooled to 320 later DEG C~350 DEG C of temperature range and heat preservation~3h, it is heated to 680 DEG C~700 DEG C of temperature range later and keeps the temperature 18~20h, 150 DEG C are furnace-cooled to come out of the stove；The convex recessed swage block of circular arc dentation, including upper swage block and lower swage block, upper swage block are the both sides conical surface Protrusion is arranged to the arc convex surface of more than two equal radiis of protrusion to centre, and by circular arc camber between adjacent circular arc convex surface Smooth excessive, lower swage block is the arc convex surface that the V-type conical surface is recessed to the intermediate more than two equal radiis for being arranged to protrusion, adjacent Arc convex surface between by circular arc camber it is smooth excessively, also by the smooth mistake of circular arc camber between the arc convex surface and the V-type conical surface Degree, the both sides conical surface angle and V-type conical surface angle it is equal be all α, α can change within the scope of 135 °~155 °.

Compared with prior art, it is an advantage of the invention that：Uniform with internal modification, residual stress is small, and crystal grain refinement disappears In addition to internal flaw, the intensity and toughness of forging greatly improved.

Specific implementation mode

Embodiment one

A kind of large electric power plant rotor forging technology, it is characterised in that：Include the following steps：

1) for the first fire by blank Heating Steel Ingots to 1200 DEG C, chamfered edge keeps the temperature 6 hours；2) use circular arc dentation convex recessed Swage block, to 1) step obtain blank material jumping-up, dial it is long, then use air blast water spray square billet is as cold as by force to 800 DEG C, using circular arc dentation Convex recessed swage block is pressed one time by 1-2-3-4 sequences, 90 ° of overturning sequence pressure one time again；3) blank material obtained to 2) step, adds Heat is to 880 DEG C of recrystallization temperature, using the convex recessed swage block jumping-up of circular arc dentation, dials long, is furnace-cooled to 320 DEG C of temperature model later It encloses and keeps the temperature 2, be heated to 680 DEG C of temperature range later and keep the temperature 18h, be furnace-cooled to 150 DEG C and come out of the stove；The circular arc dentation is convex Recessed swage block, including upper swage block and lower swage block, upper swage block are more than two phases that both sides conical surface protrusion is arranged to protrusion to centre The arc convex surface of equal radiuses, and it is smooth excessively by circular arc camber between adjacent circular arc convex surface, lower swage block is during the V-type conical surface is recessed to Between be arranged to protrusion more than two equal radiis arc convex surface, by the smooth mistake of circular arc camber between adjacent arc convex surface Degree, also smooth excessively by circular arc camber between the arc convex surface and the V-type conical surface, the both sides conical surface angle and V-type conical surface folder Equal angle is all α, and α is 135 °.

Embodiment two

1) for the first fire by blank Heating Steel Ingots to 1210 DEG C, chamfered edge keeps the temperature 6 hours；2) use circular arc dentation convex recessed Swage block, to 1) step obtain blank material jumping-up, dial it is long, then use air blast water spray square billet is as cold as by force to 800 DEG C, using circular arc dentation Convex recessed swage block is pressed one time by 1-2-3-4 sequences, 90 ° of overturning sequence pressure one time again；3) blank material obtained to 2) step, adds Heat is to 890 DEG C of recrystallization temperature, using the convex recessed swage block jumping-up of circular arc dentation, dials long, is furnace-cooled to 340 DEG C of temperature model later 2.5h is enclosed and kept the temperature, be heated to 690 DEG C of temperature range later and keeps the temperature 19h, 150 DEG C is furnace-cooled to and comes out of the stove；The circular arc dentation Convex recessed swage block, including upper swage block and lower swage block, upper swage block be both sides conical surface protrusion to centre be arranged to protrude two with The arc convex surface of upper equal radii, and it is smooth excessively by circular arc camber between adjacent circular arc convex surface, lower swage block is recessed for the V-type conical surface It is smooth by circular arc camber between adjacent arc convex surface to the arc convex surface of the intermediate more than two equal radiis for being arranged to protrusion Excessively, also smooth excessively by circular arc camber between the arc convex surface and the V-type conical surface, the both sides conical surface angle and the V-type conical surface Equal angle is all α, and α is 145 °.

Embodiment three

1) for the first fire by blank Heating Steel Ingots to 11220 DEG C, chamfered edge keeps the temperature 6 hours；2) use circular arc dentation convex recessed Swage block, to 1) step obtain blank material jumping-up, dial it is long, then use air blast water spray square billet is as cold as by force to 800 DEG C, using circular arc dentation Convex recessed swage block is pressed one time by 1-2-3-4 sequences, 90 ° of overturning sequence pressure one time again；3) blank material obtained to 2) step, adds Heat is to 900 DEG C of recrystallization temperature, using the convex recessed swage block jumping-up of circular arc dentation, dials long, is furnace-cooled to 350 DEG C of temperature model later 3h is enclosed and kept the temperature, be heated to 700 DEG C of temperature range later and keeps the temperature 20h, 150 DEG C is furnace-cooled to and comes out of the stove；On the circular arc dentation Convex recessed swage block, including upper swage block and lower swage block, upper swage block are the two or more that both sides conical surface protrusion is arranged to protrusion to centre The arc convex surface of equal radii, and it is smooth excessively by circular arc camber between adjacent circular arc convex surface, lower swage block is that the V-type conical surface is recessed to Centre is arranged to the arc convex surface of more than two equal radiis of protrusion, by the smooth mistake of circular arc camber between adjacent arc convex surface Degree, also smooth excessively by circular arc camber between the arc convex surface and the V-type conical surface, the both sides conical surface angle and V-type conical surface folder Equal angle is all α, and α is 155 °.

Claims

1. a kind of large electric power plant rotor forging technology, it is characterised in that：Include the following steps：

1) for the first fire by blank Heating Steel Ingots to 1200~1220 DEG C, chamfered edge keeps the temperature 6 hours；2) under using circular arc dentation convex Concave anvil, to 1) step obtain blank material jumping-up, dial it is long, then use air blast water spray square billet is as cold as by force to 800 DEG C, using circle-arc tooth The convex recessed swage block of shape is pressed one time by 1-2-3-4 sequences, 90 ° of overturning sequence pressure one time again；3) 2) blank material that step is obtained, It is heated to 880~900 DEG C of recrystallization temperature, using the convex recessed swage block jumping-up of circular arc dentation, dials long, it is furnace-cooled to 320 later~ 350 DEG C of temperature range simultaneously keeps the temperature 2-3h, is heated to 680~700 DEG C of temperature range later and keeps the temperature 18~20h, is furnace-cooled to 150 DEG C are come out of the stove；The convex recessed swage block of circular arc dentation, including upper swage block and lower swage block, upper swage block are that both sides conical surface protrusion arrives Centre is arranged to the arc convex surface of more than two equal radiis of protrusion, and by the smooth mistake of circular arc camber between adjacent circular arc convex surface Degree, lower swage block are the arc convex surface that the V-type conical surface is recessed to the intermediate more than two equal radiis for being arranged to protrusion, adjacent circular arc It is smooth excessively by circular arc camber between convex surface, it is also smooth excessively by circular arc camber between the arc convex surface and the V-type conical surface, it is described Both sides conical surface angle and V-type conical surface angle it is equal be all α, α can change within the scope of 135 °~155 °.