CN1221036A

CN1221036A - Method for hardening surface of roller and leveller roll and hardening equipment

Info

Publication number: CN1221036A
Application number: CN 97119827
Authority: CN
Inventors: 王树敏
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-12-25
Filing date: 1997-12-25
Publication date: 1999-06-30

Abstract

A surface quenching method and its apparatus for roller or straightening roller are disclosed. Said quenching apparatus is composed of machine tool, argon welder and water nozzle. Said quenching method features that the argon welder moves along the longitudinal direction of roller or straigthtening roller rotating at a certain speed while heating its surface by electric arc protected by argon and the water nozzle under the roller or straightening roller sprays water to the heated surface for quenching. Its advantages are simple apparatus, high quenched harness and not cracking.

Description

Hard-faced method of a kind of roll and straightening roll and quenching apparatus

The invention belongs to roll, straightening roll thermal treatment field, particularly roll, the hard-faced method of straightening roll and quenching apparatus.

Roll, straightening roll hard surfacing great majority adopt induction quenching at present.The iron steel, 1971,57, NO.5,116-125 discloses a kind of like this DFS double frequency shift dynamic formula induction quenching roll, during quenching, then adjusts its quenching temperature and temperature distribution by the Medium frequency induction coil with the low frequency induction coil heats earlier, roll rotates on one side, near Medium frequency induction coil below little by little carrying out spray quenching on one side.This method needs facility investment big, and electrical capacity is also big.Induction heating is more suitable to the plain-barreled roll quenching in addition, and is difficult to shaped roll, the hard surfacing of straightening roll pass.

The Laser Surface Treatment roll of nearest invention, roll rotates along axial line, and laser beam moves vertically, and this method can improve roll hardness, and can also handle superhard roll.But facility investment is big, and in addition, the light beam pulse deposite metal produces small arc crater on roll, should not use on finished product roller.

The purpose of this invention is to provide a kind of roll, the hard-faced method of straightening roll and quenching apparatus, it can increase the hardness of roll, straightening roll, because arc burning is stable, roll, straightening roll hardness are constant, applicable to the hard surfacing of shaped roll, straightening roll, and facility investment is few.

The present invention is achieved by the following technical solutions, and roll, straightening roll are fixed on the head of a bed and the tailstock, and argon-arc torch is fixed on the lathe cutter saddle, and water jet is fixed on below the argon-arc torch, and dial indicator is fixed on above the argon-arc torch.Roll, straightening roll; with the rotation of certain circumferential speed, and welding torch with the speed of working good along the roll axial motion, the argon arc burning; heat on electric arc breaker roll, straightening roll surface, and water jet is to roll, the straightening roll water spray Cooling Quenching of heating simultaneously.Lathe is by the engine lathe transformation of the way or special.

Argon arc burning of the present invention, breaker roll, the heating of straightening roll surface are in the arc heat quantity set; obtain darker hardened layer, roll, straightening roll hardness depth after handling like this are 1.5-5mm, and macrohardness is HRC50; can obtain high-wearing feature like this, this method is thrown porcelain than induction heating and is lacked.

Below in conjunction with accompanying drawing the present invention is further described:

Fig. 1 is a synoptic diagram of the present invention.

As shown in Figure 1, lathe, argon welder, argon-arc torch 2, water jet 1 are prior aries, are general part.Roll, straightening roll 5 are fixed on headstock and the tailstock, between lathe head of a bed chuck and the roll 5 insulating rubber slab is arranged, between the top and tailstock nylon jacket is arranged, between dial indicator seat, welding torch 2 and knife rest insulating rubber slab is arranged, between water jet 1, water coolant and the lathe insulating rubber slab is arranged, there is terminal stud at top place.Adopt the positive level of direct current property tungsten argon arc, the top positive pole that connects, tungsten electrode connects negative pole.Roll, straightening roll 5 materials are cast steel or spheroidal graphite infinitely chilled ductile cast iron.Roll, straightening roll 5 with the circumferential speed of 2-10mm/s along the rotation of roll axial line, roll, straightening roll 5 distances that welding torch 2 is laterally moved then just equal the to burn diameter of arc 3 that whenever circles.3 burnings of argon gas 4 protection electric arcs, roll, straightening roll 5 surfaces are heated 850 ℃-900 ℃, water jet 1 below argon-arc torch 2, roll, straightening roll 5 surface sprinkling Cooling Quenching to having heated simultaneously.For the globule is splashed on argon gas 4, the burning arc 3, shower recedes 15-30 °, argon welder electric current 350A-400A, tungsten electrode diameter 6mm, nozzle diameter 16mm, argon gas 4 flow 12-14l/min, arc voltage 8-15V.At breaker roll, when straightening roll 5 passes quench, on argon-arc torch 2, fixedly dial indicator 6, dial indicator 6 contacts contact with roll, straightening roll 5, according to the continuous rotation handwheel of the value of reading of dial indicator 6, proofread and correct the spacing of argon-arc torch 2 and roll, straightening roll 5, make it maintain a definite value so that electric arc 3 stable burnings.

Claims

1, a kind of roll, the hard-faced method of straightening roll; roll, straightening roll are with certain circumferential speed rotation; knife rest with the speed of working good along roll, straightening roll axial motion; it is characterized in that: argon gas (4) protection electric arc (3) burning; heat on electric arc (3) breaker roll, straightening roll (5) surface, simultaneously water jet (1) breaker roll, straightening roll (5) water spray Cooling Quenching.

2, a kind of roll, the hard-faced equipment of straightening roll, form by lathe and water jet (1), it is characterized in that: argon-arc torch (2) is fixed on the lathe cutter saddle, and water jet (1) is fixed on below the argon-arc torch (2), and dial indicator (6) is fixed on above the argon-arc torch (2).

3, roll according to claim 2, the hard-faced equipment of straightening roll, it is characterized in that: lathe is the engine lathe transformation of the way or special, lathe head of a bed chuck and roll have insulating rubber slab between (5), between the top and tailstock nylon jacket is arranged, between dial indicator seat, welding torch (2) and knife rest insulating rubber slab is arranged, between water jet (1), water coolant and the lathe insulating rubber slab is arranged, there is terminal stud at top place.