CN1321780A

CN1321780A - Horizontal water spray quenching cooling equipment of cold-rolled roll

Info

Publication number: CN1321780A
Application number: CN 00108411
Authority: CN
Inventors: 杨平生; 饶云福
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-04-30
Filing date: 2000-04-30
Publication date: 2001-11-14

Abstract

The horizontal spray quenching equipment consists of main sprayer, auxiliary sprayer, workpiece support and driving system and water pump, it is a semi-cyclic open type horizontal spray cooling equipment. After having been heated to quenching temp. the roll for cold rolling whole-body is directly placed in said equipment, at the same time of continuous rotation it can be cooled by means of high-pressure uniform spray water. It has no need of local heat insulating or shielding measures for workpiece, and its operation is convenient, and its spray cooling area and cooling speed can be regulated, its quenching hardness is high and uniform, and depth of hardened layer is large.

Description

Horizontal water spray quenching cooling equipment of cold-rolled roll

The invention belongs to the quenching heat treatment technology of metal heat treatmet technical field, particularly cold roll.

Reach technical indicators such as desired surface hardness, uniformity of hardness, effective depth of hardening for the body of roll that makes cold roll, cold roll finally all will be handled through quench hardening." thermal treatment handbook (China Machine Press, in November, 1994 version) P356-362 discloses three kinds of typical quenching technologys, from the actual treatment situation, wherein differential heating quenching and induction quenching all are difficult to obtain enough degree of depth, uniform high rigidity hardened layer.And the desired roll neck thermal insulation of whole heating quenching, very difficulty and unreliable is brought bigger difficulty to hardening step, and is easily produced quenching crack.So cold roll is on the low side work-ing life at present, is a weak link in the Iron And Steel Industry.

The objective of the invention is to design a kind of water spray quenching cooling equipment on the basis of the whole heating quenching-tempering process of routine, make the body of roll obtain high rigidity hardened layer enough degree of depth, uniform, roll neck obtains high fatigue resistance.

After adopting the present invention, the heat treatment process of cold roll is: the method that 1. adopts whole heating, make cold roll be warming up to austenitizing temperature: 2. cold roll to be placed in the quenching device proposed by the invention, carry out spray quenching, water spraying time mainly grasp do not make the body of roll cause voluntarily tempering gets final product, generally get the t=3-4min/100mm diameter; 3. after cold roll being taken out in the quenching device, cold roll is carried out cooling off second time (conventional oil cooling or air cooling) according to the supercooled austenite transition curve of steel; 4. the conventional low-temperaturetempering of cold roll.

Quenching cooler of the present invention as shown in Figure 1, different is with general spray quenching device: this device is the horizontal water-jet of a kind of semi-ring open type.Its structure is made of following four parts: 1. semi-ring formula main jet hydrophone.The inwall of this water-jet is drilled with numerous spout hole of evenly arranging, and its effect is to the body of roll cooling of spraying water strongly.Can end at the soft zone edge that Ministry of Machine-Building Industry's JB3734-84 standard laid down by the ministries or commissions of the Central Government is allowed to control actual water spray district with baffle plate shaded portions spout hole.2. workpiece (roll) supporting, location and transmission system.This system drives main drive shaft by electric motor by speed reduction unit, and roll is at the uniform velocity rotated with 60 rev/mins speed, makes roller surface periodically be subjected to spraying cooling, obtains uniform surface hardness and case depth.The radial location of roll is that the installation site by main drive shaft and driven shaft guarantees that axial location is then determined by the retaining ring on the axle.3. secondary water-jet is implemented the water spray cooling to roll neck.4. water pump and pipeline are that 3-5 atmospheric water pump supplied with the quench cooled agent to water-jet with pressure.

Enforcement of the present invention can reach following effect: 1. adopt whole heating, need not any thermal insulation or shielding measure in whole heating process of cooling, technological operation is simplified.2. owing to designed semi-ring open type water-jet, the loading and unloading of quenching workpiece, location are all very convenient, and can observe directly the work-piece cools situation in quenching process.3. adopt main jet hydrophone and secondary water-jet respectively the body of roll and roll neck to be cooled off, be convenient to the roll of unlike material is regulated neatly by customer requirements the Hardness Match of the body of roll and roll neck.4. hardness of roll body is high and even, and case depth is big; Roll neck fatigue strength height.Roll does not produce tangible quenching strain, is difficult for producing quenching crack.5. this device is suitable for the roll of different size is implemented to quench within the specific limits.

1 is the main jet hydrophone in the accompanying drawing, and 2 is secondary water-jet, and 3 is main drive shaft, and 4 is driven shaft, and 5 is retaining ring, and 6 is belt pulley, and 7 is cold roll.

The invention will be further described by the following examples.

Embodiment 1.φ 175 * 220 cold rolls, material 9Cr2Mo is heated to 900 ℃ continuously with cold roll, is incubated 30 minutes, winches in the quenching device with 3.5 atmospheric pressure spray quenchings 6 minutes, and cooling fluid is that concentration is 15% CaCl ₂The aqueous solution.Hang out the back oil cooling, then in 180 ℃ of tempering 20 hours.Test result: body surface hardness HRc63～65, case depth 12mm.About roll neck hardness HRc50.

Embodiment 2.φ 200 * 350 segmentation compound material cold rolled rollers, rolling body material GCr15, roll neck material 45 steel.Cold roll is heated to 890 ℃ continuously, is incubated 40 minutes, winch in the quenching device and cooled off 7 minutes, hung out the back oil cooling 30 minutes, then in 160 ℃ of tempering 20 hours with 3.5 barometric point water sprays.Test result: hardness of roll body HRc62～64, case depth 8mm.Roll neck hardness HRc40～45.

Claims

1. the whole heating of a cold roll water spray quenching cooling equipment is characterized in that roll in rotation, is subjected to the even pressure cooling of high pressure spraying cooling fluid.

2. refrigerating unit according to claim 1 is characterized in that setting up separately main jet hydrophone and secondary water-jet, respectively the body of roll and roll neck is cooled off.

3. refrigerating unit according to claim 1, it is semi-circular to it is characterized in that the main jet hydrophone adopts, and forms the horizontal water-jet of open type.

4. refrigerating unit according to claim 1 is characterized in that reaching the retaining ring of settling thereon by main drive shaft, driven shaft, can accurately locate by breaker roll.

5. refrigerating unit according to claim 1 is characterized in that on the main jet hydrophone plate washer being installed, and can regulate the water spray area.Require 4 described locating devices in conjunction with patent, thereby make this quenching cooler can be suitable for the hardening step of different size roll within the specific limits.

6. refrigerating unit according to claim 1 quenches applicable to various water base quench cooled liquid.