CN102581187A

CN102581187A - Method for forging flat steel by using universal hammerhead

Info

Publication number: CN102581187A
Application number: CN2012100394038A
Authority: CN
Inventors: 张晓敏; 王郁葱
Original assignee: Shanxi Taigang Stainless Steel Co Ltd
Current assignee: Shanxi Taigang Stainless Steel Co Ltd
Priority date: 2012-02-21
Filing date: 2012-02-21
Publication date: 2012-07-18
Anticipated expiration: 2032-02-21
Also published as: CN102581187B

Abstract

A method for forging flat steel by using universal hammerheads comprises feeding red steels to a chamber heating furnace, quickly heating to 1170+/-50 DEG C, holding for 2h, performing cogging at a single-edge reduction amount of 40-45mm and a frequency of 180 times/min, forging billet material into an intermediate billet with a diameter of 440mm after three-pass forging, forging from a machine A to a machine B at a reduced frequency of 90 times/min, a single-edge reduction amount of the R group of hammerheads of 30-40mm, a forging force of the R group of hammerheads of 800-900t, a single-edge reduction amount of the L group of hammerheads of 3-5mm and a forging force of the L group of hammerheads of 150-200t, forging from the machine B to the machine A at the reduced frequency of 90 times/min, a single-edge reduction amount of the L group of hammerheads of 30-40mm, a forging force of the L group of hammerheads of 800-900t, a single-edge reduction amount of the R group of hammerheads of 3-5mm and a forging force of the R group of hammerheads of 150-200t, performing final-pass forging at a single-edge reduction amount of 2-5mm, a forging force of 100-150t and a finish forging temperature not lower than 850 DEG C, and shaping four edges of the forging. The once-heating of flat steel forging is effectively controlled, the once qualified rate of the method through test is 100%, the production efficiency is improved, and at the same time the cost is lowered.

Description

A kind of method of utilizing omnipotent tup to forge band steel

Technical field:

The invention belongs to the method that the omnipotent tup of footpath forging machine forges band steel; Omnipotent tup of the present invention is a U220 set hammer head; It is the T font that its scope of attack is made up of with vertical piece horizontal block, and one of them scope of attack is the wide scope of attack, and another scope of attack is the narrow scope of attack; The length of the wide scope of attack is 600mm, and the length of the narrow scope of attack is 200mm.

Background technology:

Forging machine in footpath is when forging band steel; (code name is that 850mm (length) * 600mm (wide) * 325mm (height), G120 specification are 850mm (length) * 600mm (wide) * 325mm (height) for the F70 specification to adopt a kind of tup-band steel tup; Forging raw material upper limit specification is Φ 650mm, band steel upper limit specification: 420mm * 70 mm of becoming a useful person, thick wide maximum rate: 1: 6; This raw material specification has certain limitation; The steel ingot that steel mill supplies the footpath to forge machine has three kinds, and wherein 8.4t, 5.8t be in the blooming mill cogging, opens to suitable dimension and send forging machine in footpath to forge; Another kind of steel ingot is 6t billet (major part Φ 730mm, microcephaly Φ 600mm), if adopt the band steel tup to forge band steel; Raw material specification is greater than the maximum opening degree of tup; Must forge to suitable dimension through the cogging of round steel tup, band steel tup to be replaced such as melt down and forge once more.In the process of changing tup (changing minimum 2 hours of tup), melting down once more not only wastes coal gas, increases cost, and influences manufacturing schedule.

Summary of the invention:

In order to realize one-heating forming, the energy that avoids waste, the present invention proposes a kind of method of utilizing omnipotent tup to forge band steel.

Technical scheme of the present invention is: select for use omnipotent tup U220 (maximum opening degree Φ 750) to forge, the monolateral 30-45mm of drafts, 180 times/min of high frequency, forging force are that 450-500t and 90 times/min of low frequency, forging force are 800-900t; Be heated to after temperature is 1170 ± 50 ℃ at steel ingot, adopt monolateral drafts 40-45mm, 180 times/min of the frequency to carry out cogging earlier, through after the depressing of three passages through footpath forging machine; Blank is swaged into the waste circle of Φ 440mm, and 45 ℃ of machine jaw rotations are forged in the footpath, implement band steel and forge; When forging from the A car toward the B car, utilize R group (1#, 3#) tup (the monolateral 30-40mm of drafts, the frequency 90 times/min) forge, L group (2#, 4#) is carried out shaping (the monolateral 3-5mm of drafts, the frequency 90 times/min); When forging from the B car toward the A car; Utilize L group tup (the monolateral 30-40mm of drafts, the frequency 90 times/min) forge, the R group is carried out shaping, and (the monolateral 3-5mm of drafts, the frequency 90 times/min) are in whole forging process; Wide (470mm) of until data tup depresses forging, and leptoprosopy carries out shaping (210mm).

The present invention forges through this depressing, and has both avoided delaying production because of changing tup, has guaranteed one-heating forming again, and has guaranteed forging finished surface quality.

Adopt omnipotent tup, avoided not matching because of ingot shape and tup, the raw material secondary melts down, and reduces tup and changes, influence manufacturing schedule, the increase process cost.

The specific embodiment

Present embodiment is directly forged the operation area in Taiyuan Iron and Steel Co. section bar factory and is implemented.

The test steel grade is 20CrMo, ingot shape: 6 tons (billet, steel ingot appearance and size: big area of bed 730mm, microcephaly's size 600mm, ingot height degree 2150mm, cap open height 200mm), forging equipment is 1800 tons of footpath forging machines, forges specification 341mm * 303mm band steel.Adopt omnipotent tup U220 to forge, tup size 850mm (length) * 600mm (wide) * 250mm (height), wide 600mm, leptoprosopy 200mm.

The practical implementation process: the red steel of electric furnace smelting steel ingot (6 tons 10) send the cell-type heating furnace to quickly heat up to 1170 ± 50 ℃, is incubated after 2 hours, adopts monolateral drafts 40-45mm, 180 times/min of the frequency to carry out cogging earlier; Through after the depressing of three passages, blank is swaged into the waste circle of Φ 440mm, 45 ℃ of machine jaw rotations are forged in the footpath; The enforcement band steel forges, and reduces drafts, control range; It is 90 times/min that tup reduces the forging frequency, when forging from the A car toward the B car, and the monolateral drafts 30-40mm of R group tup, forging force 800-900t; The monolateral drafts 3-5mm of L group tup, forging force 150-200t, when forging from the B car toward the A car, the monolateral drafts 30-40mm of L group tup, forging force 800-900t; The monolateral drafts 3-5mm of R group tup, forging force 150-200t, last passage adopts monolateral drafts 2-5mm, forging force 100-150t; Shaping is carried out to four limits of becoming a useful person in final forging temperature >=850 ℃, guarantees to become a useful person surface quality.

Through the enforcement to above process for forging, 20CrMo forges the material surface well, and effect is obvious, and quality further gets a promotion, and forging first-time qualification rate is 100%.

Described waste circle is meant there is not the final bar that is shaped, and belongs to intermediate blank;

Described A, B car are meant that forging machine in footpath has two manipulators, and wherein the A car is meant and directly forges machine material loading manipulator, and the B car refers to directly forge machine blanking manipulator;

R, L group tup are meant that forging machine in footpath has 4 tups, and wherein two tups of symmetry become one group, and its code name is respectively R, L.

Claims

1. method of utilizing omnipotent tup to forge band steel is characterized in that red steel sends into the cell-type heating furnace and quickly heat up to 1170 ± 50 ℃, is incubated after 2 hours; Adopt earlier monolateral drafts 40-45mm, 180 times/min of the frequency to carry out cogging,, blank is swaged into the waste circle of Φ 440mm through after the depressing of three passages; 45 ℃ of machine jaw rotations are forged in the footpath, implement band steel and forge, and reduce drafts; It is 90 times/min that tup forges the frequency, when forging from the A car toward the B car, and the monolateral drafts 30-40mm of R group tup, forging force 800-900t; The monolateral drafts 3-5mm of L group tup, forging force 150-200t, when forging from the B car toward the A car, the monolateral drafts 30-40mm of L group tup, forging force 800-900t; The monolateral drafts 3-5mm of R group tup, forging force 150-200t, last passage adopts monolateral drafts 2-5mm, forging force 100-150t; Final forging temperature >=850 ℃, shaping is carried out on four limits to becoming a useful person.