CN101342542A

CN101342542A - Channel steel rolling method

Info

Publication number: CN101342542A
Application number: CNA2008103042833A
Authority: CN
Inventors: 王代文; 陶功明
Original assignee: Panzhihua New Steel and Vanadium Co Ltd
Current assignee: Panzhihua New Steel and Vanadium Co Ltd
Priority date: 2008-08-29
Filing date: 2008-08-29
Publication date: 2009-01-14
Anticipated expiration: 2028-08-29
Also published as: CN101342542B

Abstract

The invention discloses a groove-steel rolling method. The obliquity difference between the outside rollers of a pass of orifice and the previous pass of orifice is confirmed in accordance with the suspension height of the roll-collar and the groove depth. Under general conditions, the obliquity difference between the outside rollers of the previous pass of orifice and the next pass of orifice is positive, i.e. the obliquity of the outside roller of the previous pass of orifice is greater than the obliquity of the outside roller of the next pass of orifice; when the suspension height of a pass is greater than the groove depth and the groove depth is greater than or equal to 110mm, the obliquity difference between the outside rollers of the previous pass of orifice and the next pass of orifice is negative, i.e. the obliquity of the outside roller of the previous pass of orifice is smaller than the obliquity of the outside roller of the next pass of orifice; the stress point of the next pass or orifice is transferred to the inside roller from the outside roller, and as a result, the phenomenon that the suspension height of the roll-collar is greater than the groove depth and broken-off roll-collar is easy to occur when the groove depth is relatively big; thereby, the rolling production-line maintenance time is shortened and the production efficiency is improved; the invention is particularly applicable to the field of groove-steel rolling.

Description

Channel steel rolling method

Technical field

The present invention relates to the channel steel rolling field, especially a kind of on traditional pass design basis improved channel steel rolling method.

Background technology

Present channel steel rolling normally adopts the method production of continuous casting and rolling.In the operation of rolling, steel billet through roughing, in roll, a plurality of rolling passes of finish rolling and become channel-section steel.The corresponding pass of each passage, correspondingly, the pass that rolling channel steel uses is a pass schedule, and this system comprises several passes of a series of gradual changes, in order to make steel billet be deformed to the finished product channel-section steel gradually, the shank gradient of last a time pass is greater than the shank gradient of following a time pass.The shank gradient parameter of pass has two, be the outside roller gradient of pass and the inner roller gradient of pass, for the single pass in the pass schedule, it generally is the gradient of determining its inner roller according to the parameters such as gradient, channel-section steel width of its outside roller, when the outside of last a time pass roller gradient during greater than the outside roller gradient of following a time pass, the inner roller gradient of last a time pass is also greater than the outside roller gradient of descending a time pass.

When the collars flying height of certain a time greater than the groove degree of depth and the groove degree of depth during more than or equal to 110mm, the outside roller of this passage pass is often owing to the stressed excessive rolling mill roll that breaks away from, be commonly called as " breaking collars off with the fingers and thumb ", take place stopping production to change roll after " breaking collars off with the fingers and thumb ".Solve frequent " breaking collars off with the fingers and thumb " problem that takes place following approach is arranged: 1) in theory, can increase the collars width of outside roller, but be subjected to pass width, quantity and roll length restriction, this method has difficulties and generally is not used; 2) roll material of improvement outside roller changes cast steel or forged steel roll into by grain roll, but the easily sticking iron scale of cast steel or forged steel roll causes product surface quality poor; 3) optimize pass, reduce drafts, but this kind mode need increase rolling pass, owing to be subjected to milling train quantity and roll length restriction, this kind mode can't be implemented.。

Summary of the invention

In order to overcome existing channel steel rolling method the deficiency of " breaking collars off with the fingers and thumb " takes place easily, technical problem to be solved by this invention provides a kind of channel steel rolling method that can prevent " breaking collars off with the fingers and thumb " phenomenon.

The technical solution adopted for the present invention to solve the technical problems is: channel steel rolling method, in the employed pass of the rolling pass of middle milling train group, the pass outside roller slope difference a that determines this passage a time preceding according to the collars flying height and the groove degree of depth of this passage with it.

The outside roller slope difference a of the pass of this passage a time preceding with it, before being meant the outside roller gradient of pass of a time as minuend, the outside roller gradient of the pass of this passage as subtrahend through subtraction obtain poor.Generally speaking, the pass of this passage a time preceding with it outside roller slope difference is promptly gone up the outside roller gradient of the outside roller gradient of a time pass greater than following a time pass for just.

The invention has the beneficial effects as follows: when the collars flying height of certain a time is greater than the groove degree of depth and the groove degree of depth 〉=110mm in the central milling train group, the pass outside roller slope difference of this passage a time preceding with it is for negative, be the outside roller gradient of the outside roller gradient of its preceding a time pass less than this passage pass, make the stress point of this passage pass be transferred to inner roller by outside roller, thereby fundamentally solved incidental " breaking collars off with the fingers and thumb " phenomenon this moment, reduce the maintenance time of rolling line, improved production efficiency.

Description of drawings

Fig. 1 is the schematic diagram of the first passage pass.

Fig. 2 is the schematic diagram of the second passage pass.

Fig. 3 is the schematic diagram of the 3rd passage pass.

Fig. 4 is the schematic diagram of four-pass pass.

Fig. 5 is the schematic diagram of the 5th passage pass.

Fig. 6 is the schematic diagram of the 6th passage pass.

Fig. 7 is the schematic diagram of the 7th passage pass.

Fig. 8 is the partial schematic diagram of collars.

Be labeled as 1-outside roller, 2-inner roller, the outside roller gradient of x%-pass, H1-collars flying height, the H2-groove degree of depth among the figure.

The specific embodiment

The present invention is further described below in conjunction with drawings and Examples.

As Fig. 1～shown in Figure 8, channel steel rolling method of the present invention, in the employed pass of the rolling pass of middle milling train group, roller slope difference a outside the pass of determining this passage a time preceding according to the collars flying height H1 and the groove depth H 2 of this passage with it.

Because the general diameter of collars of roughing unit is thicker, the collars vary in diameter is little, and this moment, the plasticity of steel billet was better than the follow-up plasticity of steel billet when rolling, be difficult for taking place " breaking collars off with the fingers and thumb ", the finish to gauge unit is the passage of last typing, the shank gradient of its pass is determined, and the collars flying height H1 in the middle milling train group is bigger greater than groove depth H 2 and groove depth H 2, thereby the improvement of channel steel rolling method of the present invention is mainly used on the pass of middle milling train group, through test, the collars flying height H1 of certain a time is during greater than groove depth H 2 and groove depth H 2 〉=110mm, need make pass outside roller slope difference a＜0 of this passage a time preceding with it, be that a is negative, the pass outside roller gradient of this passage just can avoid this passage that " breaking collars off with the fingers and thumb " takes place greater than the pass outside roller gradient of its preceding a time.

Further be, consider that can not to make the roll-force of follow-up rolling pass excessive, in middle milling train group, as the collars flying height H1 of this passage during greater than groove depth H 2 and groove depth H 2 〉=110mm, the pass outside roller slope difference a of this passage a time preceding with it satisfies :-2%≤a＜0.

According to the difference of channel-section steel model, rolling total passage is generally seven passages or six passages, and correspondingly, pass outside roller slope difference should be the 5th passage or four-pass mutually for negative passage.

Embodiment:

Test is applied to channel steel rolling method of the present invention the rolling groove design of No. 24 channel-section steels.

As Fig. 1～shown in Figure 8, No. 24 channel-section steels are via seven passage roll formings, this channel steel rolling method is in middle milling train group, according to the collars flying height H1 of certain passage and the pass outside roller slope difference of groove depth H 2 definite this passage a time preceding with it, wherein roller gradient in the pass of the four-pass outside is littler by 2% than the pass outside roller gradient of the 5th passage, has stopped outside the pass of original the 5th passage the roller phenomenon of " breaking collars off with the fingers and thumb ".

Claims

1. channel steel rolling method is characterized in that: in the employed pass of the rolling pass of middle milling train group, and the pass outside roller slope difference a that determines this passage a time preceding according to the collars flying height and the groove degree of depth of this passage with it.

2. channel steel rolling method as claimed in claim 1 is characterized in that: when the collars flying height of this passage greater than the groove degree of depth and the groove degree of depth during more than or equal to 110mm, pass outside roller slope difference a＜0 of this passage a time preceding with it.

3. channel steel rolling method as claimed in claim 2 is characterized in that: rolling total passage is seven passages, and described this passage is the 5th passage.

4. channel steel rolling method as claimed in claim 2 is characterized in that: rolling total passage is six passages, and described this passage is a four-pass.

5. as claim 2,3 or 4 described channel steel rolling methods, it is characterized in that: the pass outside roller slope difference a of this passage a time preceding with it satisfies :-2%≤a＜0.