CN1986088A - Method of raising utilization rate of roll - Google Patents

Abstract

The method of raising utilization rate of rolls is applied for cold rolling and leveling product. The method features that in the cold rolling system, the support roll in rolling mill after being used to minimum size is reformed into the support roll in leveling machine for further use and the working roll in leveling machine after being used to minimum size is reformed into the working roll in rolling mill for further use. The method can raise utilization rate of rolls effectively and lower production cost.

Description

Improve the method for utilization rate of rolls

Technical field

The present invention relates to a kind of method that improves utilization rate of rolls, be applied to the rolling and smooth field of cold-rolled products.

Background technology

For cold rolling and smooth production, roll consumption has occupied very big proportion in cold rolling total production cost, and therefore, people constantly utilize various means control ton steel rider consumptions, to reduce production costs.

Restricted by rolling mill structure and system's frequency response, the stock removal of general every roll has a strong impact on the production cost of ton steel between 40-70mm.

Summary of the invention

The object of the present invention is to provide a kind of method that improves utilization rate of rolls, this method can improve effectively roll utilization rate, can effectively reduce production costs.

For achieving the above object, technical scheme of the present invention is: a kind of method that improves utilization rate of rolls, it is characterized in that: in whole cold rolling system, 1) to use to the minimum dimension the transformation of the way be that the backing roll of planisher continues to use to the milling train backing roll, method for remanufacturing is: when the milling train backing roll is used to minimum dimension, milling train backing roll after will using up earlier is worked into appearance and size near the planisher backing roll as roller stock, material will be excised to the backing roll roller footpath size near planisher in position, milling train backing roll roller footpath, heat-treat then, be refined to the appearance and size of planisher backing roll at last, the backing roll roller footpath size of planisher; Hardness of roll body after the heat treatment requires to reach 60～65HS, depth of hardening 〉=50mm; The roll shaft shoulder and axle journal hardness are 40～45HS; Hardness 35～55HS after the whole modifier treatment;

2) after the working roll of planisher is used minimum dimension, changing system into operation roll of mill continues to use, method for remanufacturing is: after the working roll of planisher is used minimum dimension, planisher working roll after will using up earlier is worked into appearance and size near operation roll of mill as roller stock, position, planisher working roll roller footpath will be excised material and be arrived near operation roll of mill roller footpath, planisher working roll axle head cut-out material is near the operation roll of mill axle head, heat-treat then, be refined to appearance and size, the operation roll of mill roller footpath size of operation roll of mill at last; Hardness of roll body after the heat treatment requires to reach 95～100HSC, depth of hardening 〉=25mm; The roll shaft shoulder and axle journal hardness are 50～55HSC; Hardness 40～55HS after the whole modifier treatment.

In whole cold rolling system, for planisher,, need big working roll roller footpath for guaranteeing mechanical performance of products, simultaneously, because roll-force is less, therefore, the roller of backing roll footpath is less.For cold-rolling mill, reduce the roller footpath of working roll, can effectively reduce roll-force and roll torque, simultaneously, need very big roll-force during owing to work, therefore, backing roll roller footpath is very big.

The present invention utilizes in whole cold rolling system, the different process requirement of cold-rolling mill and planisher breaker roll, the roller footpath of reasonable disposition milling train and planisher, after the working roll of employing planisher is used minimum dimension, changing system into operation roll of mill continues to use, it is that the backing roll of planisher continues to use that the milling train backing roll is used to the minimum dimension the transformation of the way, the stock removal of every roll is brought up to present 80-140mm by original 40-70mm, effectively reduce the roller consumption, the production cost of products that reduces, this method can improve the utilization rate of roll effectively.

Description of drawings

Fig. 1 is a planisher backing roll assembling sectional drawing

Fig. 2 is a planisher working roll assembling sectional drawing

Fig. 3 is working roll figure

Fig. 4 is the working roll sectional drawing of milling train, planisher

Among the figure: the 1-backing roll, 2-backing roll fore side four-line column roller bearing, 3-backing roll fore side bearing block, 4-backing roll transmission side bearing block, the 5-thrust bearing, 6-backing roll fore side end cap, 7-backing roll transmission side end cap, 8-backing roll transmission side four-line column roller bearing, 9-milling train backing roll outer contour, 10-planisher backing roll outer contour, 11-oil gas inlet, 12-backing roll roll neck; The 13-working roll, 14-working roll fore side four-row tapered roller bearing, 15-working roll fore side bearing block, 16-working roll transmission side bearing block, 17-working roll fore side end cap, 18-working roll transmission side end cap, the inboard end cap of 19-fore side, the inboard end cap of 20-transmission side, 21-working roll transmission side four-row tapered roller bearing, 22-planisher working roll outer contour, 23-operation roll of mill outer contour.

The specific embodiment

In order to understand the present invention better, further illustrate content of the present invention below in conjunction with embodiment, but content of the present invention not only is confined to the following examples.

A kind of method that improves utilization rate of rolls, in whole cold rolling system, it is that the backing roll of planisher continues to use that the milling train backing roll is used to the minimum dimension the transformation of the way; After the working roll of planisher is used minimum dimension, change system into operation roll of mill and continue to use.

It is that the backing roll of planisher continues to use that described milling train backing roll is used to the minimum dimension the transformation of the way:

As shown in Figure 1, two chain line parts (label 9) are the profiles of the backing roll of milling train, and it is of a size of Φ 1300/1150 * 1500mm (size among Fig. 1-2, Fig. 4 all is mm); Solid line part (label 10) is the profile of planisher backing roll, and it is of a size of Φ 1200/1100 * 1500mm.After Φ 1150 diameters are arrived in the backing roll reconditioning of milling train, can't use as the backing roll of milling train, just can use its transformation of the way this moment for the backing roll of planisher, the method for the transformation of the way is that the milling train backing roll after will using up earlier is worked into appearance and size (noting must also will staying this moment certain allowance to use for fine finishining) near the planisher backing roll as roller stock; In this example mainly be position, milling train backing roll roller footpath to excise material near the backing roll roller of planisher directly size (roll neck of planisher is of a size of Φ 680mm in this example, the backing roll roll neck of milling train is of a size of Φ 800mm), heat-treat then, be refined to the appearance and size of planisher backing roll, the backing roll roller footpath size (mainly being meant the processing of roller footpath and body surface here) of planisher at last.Because what roll material adopted is Cr alloy forged steel, so the hardness of roll body after the heat treatment requires to reach 60～65HS (depth of hardening 〉=50mm); The roll shaft shoulder and axle journal hardness are 40～45HS; Hardness 35～55HS after the whole modifier treatment.The body of roll of roll, the HS hardness of roll neck is measured on its bus, the bus number of mensuration all is no less than 4, and bus should evenly distribute, along the barrel length direction and circumferentially difference of hardness be not more than 4HS, and the counter roller difference of hardness is less than 4HS.Like this transformation of the way back use as the backing roll of planisher also have～reconditioning quality of 50mm can use, and so just reached the purpose that makes full use of roll.The design's design concept is that the minimum working roll that planisher backing roll maximum functional roller directly is designed to less than the milling train backing roll directly is best.

From cost, backing roll～20 shown in the last figure ton.By the present market price～50,000/ton, such roll just is worth about 1,000,000 yuan, and the installation quantity of a single chassis reversable mill backing roll is 2, adds the quantity of spare part, the total quantity of the backing roll of reasonable disposition should be no less than 6, so its fund amount that takies is bigger.If therefore can effectively prolong time life-cycle of roll, this can reduce the operating cost of steel rolling mill greatly.

After the working roll of described planisher is used minimum dimension, change system into operation roll of mill and continue to use:

As Fig. 2, Fig. 3, shown in Figure 4, two chain line parts (label 23) are the profiles of the working roll of milling train among Fig. 2, and it is of a size of Φ 425/385 * 1500mm; Solid line part (label 22) is the profile of planisher working roll, and it is of a size of Φ 480/430 * 1500.After Φ 430 diameters are arrived in the working roll roller reconditioning of planisher, can't use as the working roll of planisher, just can use the working roll of its transformation of the way for milling train this moment, the method of the transformation of the way is that the planisher working roll after will using up earlier is worked into appearance and size near operation roll of mill (note must also will staying this moment certain allowance for fine finishining with) as roller stock, mainly be that material will be excised to (planisher working roll roll neck is of a size of Φ 266.7mm in this example near operation roll of mill roller footpath in position, roller footpath in this example, the operation roll of mill roll neck is of a size of Φ 220.662mm, also have axle head also to need to excise a part of material), heat-treat then, be refined to the appearance and size of operation roll of mill at last, operation roll of mill roller footpath size (mainly being meant the processing of roller footpath and body surface here).Because what roll material adopted is Cr alloy forged steel, so the hardness of roll body after the heat treatment requires to reach 95～100HSC (depth of hardening 〉=25mm); The roll shaft shoulder and axle journal hardness are 50～55HSC; Hardness 40～55HS after the whole modifier treatment.The body of roll of roll, the HS hardness of roll neck is measured on its bus, and the bus number of mensuration all is no less than 4, and bus should evenly distribute, and be not more than 2HS along barrel length direction difference of hardness, and the counter roller difference of hardness is less than 2HS.The design's design concept is that the minimum working roll of planisher working roll directly is designed to maximum functional roller footpath greater than operation roll of mill, has so just reached the purpose that makes full use of roll.

Therefore according to this thinking, by reasonable structural design, not only can make the backing roll of milling train can change a social system the backing roll that becomes planisher, the working roll of planisher can be changed a social system the working roll that becomes milling train, and for six-high cluster mill, its intermediate calender rolls also can be changed a social system and be working roll.Just utilized roll fully by rational design like this, its value is embodied fully, also the operating cost that reduces for steel rolling mill.

Claims (1)

1. method that improves utilization rate of rolls, it is characterized in that: in whole cold rolling system, 1) to use to the minimum dimension the transformation of the way be that the backing roll of planisher continues to use to the milling train backing roll, method for remanufacturing is: when the milling train backing roll is used to minimum dimension, milling train backing roll after will using up earlier is worked into appearance and size near the planisher backing roll as roller stock, material will be excised to the backing roll roller footpath size near planisher in position, milling train backing roll roller footpath, heat-treat then, be refined to the appearance and size of planisher backing roll at last, the backing roll roller footpath size of planisher; Hardness of roll body after the heat treatment requires to reach 60～65HS, depth of hardening 〉=50mm; The roll shaft shoulder and axle journal hardness are 40～45HS; Hardness 35～55HS after the whole modifier treatment;

2) after the working roll of planisher is used minimum dimension, changing system into operation roll of mill continues to use, method for remanufacturing is: after the working roll of planisher is used minimum dimension, planisher working roll after will using up earlier is worked into appearance and size near operation roll of mill as roller stock, position, planisher working roll roller footpath will be excised material and be arrived near operation roll of mill roller footpath, planisher working roll axle head cut-out material is near the operation roll of mill axle head, heat-treat then, be refined to appearance and size, the operation roll of mill roller footpath size of operation roll of mill at last; Hardness of roll body after the heat treatment requires to reach 95～100HSC, depth of hardening 〉=25mm; The roll shaft shoulder and axle journal hardness are 50～55HSC; Hardness 40～55HS after the whole modifier treatment.

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