CN1077460C

CN1077460C - Planetary rolling mill of square billets

Info

Publication number: CN1077460C
Application number: CN98125640A
Authority: CN
Inventors: 康祖立; 林竝; 王桂兴
Original assignee: Shougang Corp
Current assignee: Beijing Shougang Machinery & Electric Co., Ltd.
Priority date: 1998-12-23
Filing date: 1998-12-23
Publication date: 2002-01-09
Anticipated expiration: 2018-12-23
Also published as: CN1257760A

Abstract

The present invention relates to a rolling mill of square billets with heavy reduction, which is composed of a mill rack, four groups of planet rollers and a drive mechanism, wherein each group of rollers is composed of a support roller and work rollers around the support roller. The axial lines of the support roller and the work roller are arranged within the same plane. An upper work roller, a lower work roller, a left work roller and a right work roller alternately pass through a rolling deformation zone at intervals by the linkage of an engaged bevel gear. The spreading rate of a pass can achieve six or so. Practically, when each work roller passes through the rolling deformation zone in a microscopic field, only micro press exists. The present invention is suitable for cogging rolling for continuously cast square billets.

Description

Planetary rolling mill of square billets

The present invention relates to a kind of rolling machinery, belong to middle-size and small-size mechanical equipment of steel rolling.

Present middle-size and small-size cogging roughing mill or lifting platform is set with powerful 650 milling trains front and back, or multimachine frame tandem rolling finishes, and cost of equipment is higher.

Purpose of the present invention just provides a kind of novel machining deformation technology that adopts, and is rolling with an equipment a time, finishes the moderate finite deformation amount and is out of shape lower-powered bad planetary rolling of side.

Planetary rolling mill of square billets, comprise frame, four groups of planet rolls, transmission mechanism, about presenting down, arrange by four groups of planet rolls, roll axis is in same plane, every group of planet roll is made up of intermediate support roller 2 and the working roll 1 around it respectively, certain interval is arranged between the working roll 1, the interval of upper working rolls and lower working rolls 1 just is the position of left and right sides working roll 1, the bearing block of described working roll 1 drops on and keeps on the circle 3, and working roll 1 is pressed on the backing roll 2 by spring, keep circle 3 and bevel gear 4 to join together on the axle journal that is enclosed within supporting, the bevel gear 4 of each roller group intermeshes, about the realization, the synchronous rotation of left and right sides working roll, the bearing block of backing roll 2 drop on the frame 8, main transmission 6 drives backing roll by the bevel gear 5 of backing roll spindle nose, and frame 8 is provided with a pair of push rolls 9.

The working roll number of every group of planetary rollers of planetary rolling mill of square billets is Z=8-10.

The present invention has the following advantages:

1. equipment investment is few, and a milling train can replace by several cogging roughing mills;

2. the rolling lengthening coefficient that obtains about 6 of a time;

3. though a deflection is very big, because a plurality of working roll rolling compactions, draught pressure is less, and consumed power is little.

Below in conjunction with accompanying drawing this invention is elaborated.

Fig. 1 (A) is the planetary rolling mill of square billets structure chart

Fig. 1 (B) is a planetary rolling mill of square billets B-B profile

Fig. 2 (A) is the planetary rolling mill of square billets fundamental diagram

Fig. 2 (B) is planetary rolling mill of square billets principle Analysis figure

Shown in Fig. 1 (A) this planetary rolling by about, about the axis arranged of four groups of planet rolls in same facade (Fig. 1 (B)), every group of planetary rollers is made up of round backing roll 2 working roll 1 of similar number, have between the adjacent working roll at interval, its purpose is that upper working rolls and lower working rolls and left and right sides working roll can alternately be staggered by the rolling deformation district, be that upper working rolls and lower working rolls is when being in the deformed area, left and right sides working roll is an interval location, when then left and right sides working roll is come the deformed area, up-down rollers is again at interval, all the time so circulation.

The bearing block of working roll 1 drops on and keeps on the circle 3, and working roll is pressed on the backing roll 2 by spring, spring force is greater than the centrifugal force of working roll, so that working roll contacts with backing roll all the time, keep the unlikely destruction of operative relation of roll shop building, and avoid impacting owing to clearance between roll causes between roller when rolling.Keeping circle 3 is that sky is enclosed within on the axle journal of backing roll, and and axle journal between be provided with bearing, but so that keep each Xingqi thing of rotating speed of circle and backing roll.Keep having the bevel gear 4 of 4, the four groups of planetary rollers of bevel gear that join together to be meshing with each other on the circle 3, in order to about keeping, left and right sides working roll synchronously, and about realizing, left and right sides working roll can be alternately by the rolling deformation district.

Back-up chock drops on the frame 8, and the backing roll spindle nose is equipped with bevel gear 5, and main transmission 6 drives each backing roll by bevel gear 5, and frictionally drives each working roll 1 and does rotation again.The revolution of working roll is to realize by auxilliary transmission 7 transmission bevel gears 4.Synthesizing of major-minor transmission, finished the planet running of working roll, promptly working roll can be done rolling spreading campaign in the deformation of rolled wire district.

Equipment size parameter of the present invention and backing roll footpath D, working roll footpath d, working roll roller are counted Z, barrel length B, roller group axis centre apart from A, their cross dimensions of determining to depend on blank and finished product.These parameters determine that the back keeps physical dimensions such as circle, bevel gear to comprise that arranging of frame just can determine, and retrain in addition each other.

Rolling deformation mechanism of the present invention is referring to accompanying drawing 2 (A), rolled piece is done the rolling spreading by the rolling deformation district continuously successively by the working roll of backing roll periphery, when blank with feed rate Vs millimeter/when being distributed into, layer metal elongation that fall along on the deformed area cambered surface that each working roll is finished depends on the feed S millimeter of blank to each working roll, this is the essence of each working roll small deformation amount on microcosmic, and the continuous accumulation of small deformation amount has formed macroscopical notion that big pressure amount.The metal feed of each working roll is:

In the formula, Np---keeps circle rotating speed (being working roll revolution speed) rev/min Z---working roll number, gets Z=10

The physical concept of formula is that the feed system of blank in the unit interval shared by the working roll number by the deformed area in the unit interval.In fact the S value only is the trace of 1-4 millimeter.So working roll is all little to the drafts and the contact area of rolled piece, therefore draught pressure is also little.

Roller of the present invention is a kinematic parameter, keeps following relationship for keeping working roll to do the planet running:

In Ng=(Nz-Np) the D/d formula, Ng---working roll rotating speed (being that working roll is from rotating speed) rev/min Nz---backing roll rotating speed, rev/min Np---keep circle rotating speed (being working roll revolution speed) rev/min

Actual driving process, it or not the triangle length velocity relation as shown in Fig. 2 (B), because rolled piece is to send to continuously with V8 speed, outermost point (working roll and rolled piece contact point) is non-vanishing, the actual speed relation is trapezoidal, make auxilliary the driving that an increment Delta Vp (Δ Np) be arranged, corresponding to different feed rates, auxilliary driving should be able to be adjusted.

Power energy parameter of the present invention, little in view of rolling contact area, draught pressure is little, calculates that roll torque and rolling power are also little.The resultant direction of draught pressure is shown in the P among Fig. 2 (B), and rolled piece is released in the horizontal component of P power attempt, and the ability of the rolled piece of for this reason not nipping must be provided with a pair of push rolls and rolled piece is forced send into.

Claims

1. planetary rolling mill of square billets, comprise frame, four groups of planet rolls, transmission mechanism, it is characterized in that: arrange about four groups of planet rolls are presented down, roll axis is in same plane, every group of planet roll is made up of intermediate support roller (2) and the working roll (1) around it respectively, working roll has certain interval between (1), the interval of upper working rolls and lower working rolls (1) just is the position of left and right sides working roll (1), the bearing block of described working roll (1) drops on and keeps on the circle (3), and working roll (1) is pressed on the backing roll (2) by spring, keep circle (3) and bevel gear (4) to join together on the axle journal that is enclosed within supporting, the bevel gear of each roller group (4) intermeshes, about the realization, the synchronous rotation of left and right sides working roll, the bearing block of backing roll (2) drops on the frame (8), main transmission (6) drives backing roll by the bevel gear (5) of backing roll spindle nose, and frame (8) is provided with a pair of push rolls (9).

2. planetary rolling mill of square billets as claimed in claim 1 is characterized in that: the working roll number of every group of planetary rollers is Z=8-10.