CN109746272A - A kind of Novel composite hot roller and its manufacturing method - Google Patents

Abstract

The present invention relates to a kind of Novel composite hot roller and its manufacturing methods, belong to hot roll and manufacture field.Hot roll of the invention is made of hot rolling roller body, and hot rolling roller body includes the body of roll and roller head, and the provided circumferentially about of the body of roll has annular groove, and annular groove bottom is provided with transition zone, is provided with working lining on transition zone.The present invention is according to the stress distribution feature of hot roll, use different welding material, the ingredient and tissue of hot rolling roller surface different parts are changed, to disperse spreading power, the thermal stress born when hot roll work, and then has achieved the purpose that promote hot roll performance；Compared with the correspondence hot roll of conventional method manufacture, the service life of hot roll can be effectively improved, the benefit of processing is improved, reduces the maintenance time of hot roll and milling train, reduces the manufacturing cost of steel, there is good economic benefit.

Description

A kind of Novel composite hot roller and its manufacturing method

Technical field

The present invention relates to a kind of Novel composite hot roller and its manufacturing methods, belong to hot roll and manufacture field.

Background technique

In hot-rolled steel production, the hot roll on rolling mill is the important consumable part for determining rolling mill efficiency and mill bar quality One of, the sole mass of hot roll directly affects the type quality of steel, and hot roll work crossbar transistion high temperature and Under the action of power, surface is repeatedly subjected to rub, and can generate strong abrasion, and therefore, there is quite the quality of hot roll in steel mill High requirement.And the roll that do not stint using whole high-speed steel or hard alloy, in this way, not only substantially increasing production Cost will also cause waste to core of the roll material, therefore, improve the important class that innovation is steel mill to hot roll Topic.

Steel rolling mill improves the mode of innovation to hot roll at present, it is common that using conventional medium carbon steel: such as The materials such as 55Mn2,55Cr, 60CrMnMo, 60SiMnMo, and the mode of its surface hardness is promoted, such as high frequency, intermediate frequency, carburizing Mode.Although this mode has certain effect；But since hot roll can produce in the preparatory process before manufacture and use Raw residual stress and thermal stress, when use, further receive the effect of various cyclic stresses, including bending, torsion, shearing, Contact stress and thermal stress etc., and these stress are uneven and continually changing along the distribution of the body of roll, trace it to its cause not only There is design factor, there are also rolls to wear in use, the continually changing reason of temperature and roller shape, in addition, rolling condition also passes through Often it will appear abnormal conditions, while roll cools down improper after use, also will receive the damage of thermal stress.And roll is except mill Damage is outer, and also often various local damages and surface damage, the above-mentioned reason such as cracked, fracture, peeling, impression do not only result in heat The service life of roll is shorter, also directly affects the benefit and processing quality of steel rolling.

Summary of the invention

It is an object of the invention to: a kind of stress distribution feature according to hot roll is provided, using different welding material, To change the ingredient and tissue of hot rolling roller surface different parts, so that spreading power, the heat dispersing to be born when hot roll work are answered Power and then the Novel composite hot roller and its manufacturing method for reaching promotion hot roll performance.

The present invention is to realize above-mentioned purpose by following technical solution: a kind of Novel composite hot roller, it is by hot rolling Roller body is constituted, and hot rolling roller body includes the body of roll and roller head, it is characterised in that: and the provided circumferentially about of the body of roll has annular groove, Annular groove bottom is provided with transition zone, is provided with working lining on transition zone；The buffer layer material are as follows: 0Cr17Ni4Cu4Nb steel alloy, the layer depth of transition zone are 20-30mm, the working layer be cobalt-chromium-tungsten alloy ( CoCrW) steel alloy, the layer depth of working lining are 10-15mm, and the work layer cross section is in T-shaped.

Its manufacturing method the following steps are included:

1) it, selects suitable blank that hot rolling roller body is made by design size vehicle first, and carries out surface inspection, further according to hot rolling Vehicle produces suitable annular groove to the length of the roller body of roll as required；

2), hot roll body surface greasy dirt is cleaned up with acetone soln, then hot rolling roller body is preheated in baking oven, 200 ° -250 ° of preheating temperature, keep the temperature 20 minutes；

3), after the completion of the preheating of hot rolling roller body, 0Cr17Ni4Cu4Nb steel alloy is dissolved in ring by the way of conventional built-up welding Connected in star bottom, becomes transition zone；

4), after the completion of transition zone built-up welding, cobalt-chromium-tungsten alloy (CoCrW) steel alloy is dissolved in mistake by the way of conventional built-up welding Layer surface is crossed, working lining is become；After the completion of working lining built-up welding, work layer surface is refined using surface grinding machine, is made Its roughness reaches Ra0.8 or more.

Using the intermediate distribution that the stress of hot roll produced by the present invention at work is toward plate (product), heat Roll middle section subjects bigger spreading power, and often hot roll is also cracked, impression, oxidation by intermediate roll surface Layer the defects of falling off (problem), these crackles, impression, oxide layer fall off etc. to be slowly diffused under the action of stress, most Hot roll is caused to be scrapped eventually.And the stress situation that the present invention is born according to plate carry out it is reversed calculate when hot roll works by Then power situation improves hot roll surface texture, change the ingredient and tissue of hot rolling roller surface different parts, from And spreading power, the thermal stress born when hot roll work are dispersed, and then with minimum manufacturing cost and manufacture difficulty, mention The service life of hot roll is risen, can make common enterprise can voluntarily complete the manufacturing process of hot-rolled steel (referring to attached drawing 2).

The beneficial effects of the present invention are: the present invention uses different welding materials according to the stress distribution feature of hot roll Material, changes the ingredient and tissue of hot rolling roller surface different parts, to disperse the spreading born when hot roll work Power, thermal stress, and then achieved the purpose that promote hot roll performance；It, can be with compared with the correspondence hot roll of conventional method manufacture The service life for effectively improving hot roll improves the benefit of processing, reduces the maintenance time of hot roll and milling train, drop The low manufacturing cost of steel has good economic benefit.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of hot roll of the invention；

Fig. 2 is the stress distribution finite element analysis figure of hot roll of the invention at work.

In figure: 1, the body of roll, 2, roller head, 3, annular groove, 4, transition zone, 5, working lining.

Specific embodiment

The Novel composite hot roller is made of hot rolling roller body, and hot rolling roller body includes the body of roll 1 and roller head 2.The body of roll 1 provided circumferentially about has an annular groove 3, and it is 20-30mm, 0Cr17Ni4Cu4Nb that 3 bottom of annular groove, which is provided with layer depth, The transition zone 4 that steel alloy built-up welding is formed, it is 10-15mm, cobalt-chromium-tungsten alloy (CoCrW) that layer depth is provided on transition zone 4 The working lining 5 that steel alloy built-up welding is formed, 5 section of working lining are in T-shaped (referring to Fig. 1).

When the Novel composite hot roller produces, select suitable blank that hot roll sheet is made by design size vehicle first Body, and carry out surface inspection, further according to the length of the hot roll body of roll, vehicle produces suitable annular groove 3 as required；And with third Ketone solution cleans up hot roll body surface greasy dirt, then preheats in baking oven to hot rolling roller body, preheating temperature 200 ° -250 °, keep the temperature 20 minutes.

After the completion of the preheating of hot rolling roller body, 0Cr17Ni4Cu4Nb steel alloy is dissolved by the way of conventional built-up welding Annular groove bottom becomes transition zone 4；After the completion of 4 built-up welding of transition zone, by cobalt chromium by the way of conventional built-up welding Tungsten alloy (CoCrW) steel alloy dissolves on 4 surface of transition zone, becomes working lining 5；5 built-up welding of working lining is completed Afterwards, 5 surface of working lining is refined using surface grinding machine, its roughness is made to reach Ra0.8 or more.

The transition zone 4 and 5 material therefor of working lining of the Novel composite hot roller can be selected as the case may be It selects, but it must be ensured that 4 hardness of transition zone reaches 55HRC or more, and with the good ability for absorbing heat；Work Layer 5 must reach the material of 65HRC or more using hardness, and must assure that the smooth and slickness on surface.

The present invention according to hot roll at work its stress be toward plate (product) intermediate distribution characteristic, carry out It is reversed to calculate stress condition when hot roll works, then pass through 3 bottom of annular groove 3 and annular groove on the body of roll 1 Working lining 5 on the transition zone 4 and transition zone 4 in portion, the spreading power and thermal stress that dispersion hot roll is born when working, And the heat generated by transition zone 4 and hot roll bulk absorption working lining 5, hot roll performance is promoted to reach Purpose.

5 surface of working lining of the Novel composite hot roller is refined using surface grinding machine, and roughness can reach Ra0.8 or more has certain surface quality, the spreading power being subject in production with plate (product) at normal distribution, So as to eliminate the stress of hot roll corner, and then achieve the purpose that promote hot roll service life, and have structure simple, The features such as effect is obvious.

Claims (1)

1. a kind of Novel composite hot roller, it is made of hot rolling roller body, hot rolling roller body include the body of roll (1) and roller head ( 2), it is characterised in that: the provided circumferentially about of the body of roll (1) has annular groove (3), the setting of annular groove (3) bottom Have transition zone (4), working lining (5) are provided on transition zone (4)；Described transition zone (4) material are as follows: 0Cr17Ni4Cu4Nb steel alloy, the layer depth of transition zone (4) are 20-30mm, and the working lining (5) material is cobalt Chromium tungsten alloy steel alloy, the layer depth of working lining (5) are 10-15mm, and the working lining (5) section is in T-shaped；

Its manufacturing method the following steps are included:

1) it, selects suitable blank that hot rolling roller body is made by design size vehicle first, and carries out surface inspection, further according to hot rolling Vehicle produces suitable annular groove (3) to the length of the roller body of roll as required；

2), hot roll body surface greasy dirt is cleaned up with acetone soln, then hot rolling roller body is preheated in baking oven, 200 ° -250 ° of preheating temperature, keep the temperature 20 minutes；

3), after the completion of the preheating of hot rolling roller body, 0Cr17Ni4Cu4Nb steel alloy is dissolved in ring by the way of conventional built-up welding Connected in star (3) bottom, becomes transition zone (4)；

4), after the completion of transition zone built-up welding, cobalt-chromium-tungsten alloy steel alloy is dissolved in transition zone (4) by the way of conventional built-up welding Surface becomes working lining (5)；After the completion of working lining (5) built-up welding, using surface grinding machine to working lining (5) Surface is refined, its roughness is made to reach Ra0.8 or more.