SU1754238A1 - Mill for rolling thin films - Google Patents

Abstract

Use: for rolling thin ribbons. Essence of invention. The mill contains a bed in which in the upper and lower bearings there are smooth rolling rolls with their own rolling diameters. On the opposite ends of each of the bearings, from the metal entrance to the deformation zone, are made side, facing each other, protrusions . This makes it possible to increase the reliability of 5 sludge, And Table

Description

The invention relates to the processing of metals by pressure and can be used for the cold rolling of thin ribbons.

It is known that with a decrease in the diameter of the rolls, the contact voltage along the zachate arc decreases. During cold rolling, the elastic compression strain can be significant. Local flattening of the rolls, and in the case of cold rolling and rolled strip, in the deformation zone influences the deformation parameters. Therefore, when rolling strips, in order to reduce elastic deformations and thereby increase the dimensional accuracy of rolled products, small diameter diameters are used, which makes it possible to simultaneously reduce contact stresses and, consequently, energy consumption. But in this case rolls deflection occurs. Getting the minimum thickness of the tape is limited by the size of the diameter of the rolls. To avoid the deflection of work rolls, large-diameter support rolls are used, as for example, this is done in multi-roll mills.

The disadvantage of these devices is the presence of support rolls, those. an intermediate link which has its own errors in the geometrical dimensions of the thickness of the rolled ribbons due to the possible spin of the surface of rotation,

Closest to the present invention is a precision small-sized rolling mill containing a frame, rolls, installed with their own rolling diameters in the upper and lower sliding bearings. At the opposite ends of each roll, pulleys are installed, connected by belt drives from the electric motor of individual RECEIVES. In this mill, there is no intermediate link in the form of support rolls. Thanks to the support of working rollers directly on the bearings, their stiffness and the accuracy of the rolled tapes increase.

A disadvantage of the known mill is that there is no mechanism for limiting the width of the rolled belts. This can cause twisting and, as a result, breakage.

rolls, since the moment transferred to the roll, ceteris paribus, is proportional to the width of the rolled strip.

The whole invention is to increase mill reliability.

The goal is achieved by the fact that in the mill for rolling thin belts containing aapka, installed with their own rolling diameters in the upper and lower sliding bearings, and the drive of the rotation of the legs, each sliding bearing is installed between the legs of the bed and is made for the entire width of the window of each frame and side of the metal entrance to the deformation zone with the protrusion facing each other, while the lower sliding bearing is mounted so that it can be re-routed along the longitudinal axis of the rolls from its own drive.

In Fig.1 schematically depicts a mill, a section; figure 2 is a view of And figure 1; in FIGS. 3 and 4 there are graphs of the relationship between the size of the diameter of the rolls and the width of the rolled tapes in FIG. 3; the material of the rolled tapes 4 is steel 10, and in FIG, 4 the material is copper No. 1); figure 5 - the geometric parameters of the "aha deformation.

The mill contains a frame 1 welded design, in which the upper bearing

2 and the lower bearing 3 are installed with their rolling diameters smooth rolling rolls 4 and 5. The sliding bearings grab the upper and lower semi-cylinders formed respectively by the upper and lower rollers and come into contact with their rolling surfaces after the latter have left the deformation zone. The rolls are equipped with individual drives (not shown) located on their opposite end sides (due to the small diameter of the rolls). At the opposite ends of each of the bearings 2 and 3, from the side of the metal entrance to the deformation zone, there is one side facing each other to the protrusion 6 and 7, which is made integral with the bearing or rigidly fixed on it. The projections are arranged in parallel, and also overlap in height. These protrusions limit the working surface along the length of the rolls. Lower bearing

3 is mounted on the frame with the possibility of movement along the axis of the roll by means of a screw mechanism 8, which is mounted in the bracket 9 with the possibility of interaction with the bearing 3. Together with the side projections 6 and 7, this provides control of the limiting width of the rolled ribbons. Experimentally ustanoz

It is necessary that the height H of the protrusion is limited to from 3/4 d to d, and its width C must be in the range from 1/2 d to d. Experiments have shown that if the height H is greater than the diameter d of the roll when the bearings set half of the cylindrical surface of each roll, the protrusions will expand into the opposite surfaces of the bearings when the roller is flattened.

contact. When H is less than 3/4 d, in the process of increasing the gap between the rollers, the protrusions do not guarantee the width of the deformation zone overlaps. With a width C less than 1/2 d, the protrusion has a low structural strength, and with C more d it increases the dimensions and intensity of the bearings. The adjustment of the working gap between the rollers in the vertical direction is carried out using

screws 10 and 11, fixed in the frame 1.

The protrusions 6 and 7 overlap the rolling zone of the workpiece 12 (figure 5) in a vertical plane and thereby limit its width in accordance with the dependence

AT

rfOrj

Formula derived

16 p tgpatt} based on the dependence for the moment required for rotation of both rolls, taking into account the friction losses in the bearings and equal to М P (20-Hjf). So dl. rotation of one roll moment is equal to М Р (). According to the formula MX / WP r,

... where for a solid shaft Wp- - ,,. Obviously

but what, where P is the rolling force. The proposed construction of the stang can work reliably in the case when the time is less than the allowable and for one roll

BP (a + fd / 2) | -fr,

Based on known dependency

/ Pxxdx

45 a

and calculation formulas contact / Pxdx

A.I.Tselikov for lagging and advancing zones, as well as

dependencies In it equation

TST (T + Td7TJ receive

AT

rd

Mr. Ah 16 K L A

5 + 1

7T7 + /:

h, -, v &

I h j

W

+

1 q2 1 G 2 hH 27T + T)

Bn r / bn. one

Pts G / PN

P (t)

Zn

2fiL

where d tgk coefficient taking into account

influence of contact friction;

 - the length of the arc capture;

Ah - absolute compression;

H is the thickness of the tape before compression;

h - tape thickness after crimping;

Bn is the thickness of the tape in the plane of the neutral section;

fi coefficient of movement between the rolls and the rolled tape.

Based on this equation, we obtain specific dependencies between the size of the diameter of d and the width of the rolled strips B (see Tables 1 and 2).

By adjusting the working gap between the rollers and adjusting the restriction of the width of the tape in accordance with the table. 1 and 2, include drives, together rotating the rolls. Then serves the workpiece in the rolling zone. In this case, the rolls synchronously rotate in different directions and carry out the rolling process. Steel 40X is chosen as the material of the surface, the torsion resistance of which is MPa at H C 46-50. Materials were rolled - steel 10, for which the yield strength of MPa, and copper M1, for which the yield strength of MPa.

Table 1 shows the dependences between the size of the diameter d of the rolls and the allowable width B of the rolled tapes with different shrinking protrusions (the material of the rolled tapes is steel 10).

Table 2 presents the same dependencies (the material of the rolled tapes is copper M1).

As the experiments show, rolling according to the modes given in Tables 1 and 2, did not lead to torsion and breakage of the rolls.

Table 3 shows the results of the experiment on the prototype {W - widths of rolled strips, material - steel 10, Ba - same widths, material - copper M1).

As the results of the experiments show, when rolling on the prototype mill, rolls break down due to twisting (table 3).

Table 4 shows the values of the efforts on

rolls and rolling capacities with different roll diameters and different relative strains (the material of the rolled tapes is steel 10, the calculated width of the tape

 mm, the initial thickness is 0.025 mm and the rolling speed is 0.05 m / s).

As can be seen from the above examples, the proposed mill design increases the reliability of its operation and reduces the energy intensity of the rolling process.

From tab. 1 and 2, it can be seen that with a decrease in the diameter of the rolls and with an increase in calcining, the allowable width of the rolled belts decreases. Comparing table 1 and 2, we see

that with the same roll diameter for different material of rolled tapes, the allowable widths are different, since the yield strengths of the material are different (specific ratios are given in the tables).

In block 4 it is shown that if the width of the tape is 170 mm, with different diameters of the usipi rolls and the power of rolling are different, and with increasing diameter of the rolls the force and power of rolling increase. From Table 4 it can be seen that as the diameter of the rolls increases, the rolling power increases, so the proposed mill design provides energy savings (specific ratios are given in the table).

Claims (1)

Claims An mill for rolling thin belts comprising a bed, rolls mounted with their own rolling diameters in the upper and lower sliding bearings, driving the rolls, characterized in that, in order to increase reliability, each sliding bearing is mounted between the posts of the bed, made over the entire width of the window of each bed and from the side of the metal flow into the deformation zone with the protrusion facing each other, while the lower sliding bearing is installed movable along the longitudinal axis of the rolls from its own drive. Table 1 // ,, CG-g: Sch «I1IIIIi | L- ™ - - “™ ™ J“ HH - 3raa i-no. “I, f | 1L.   hell yeah, distitisti maz, .J & L.L 1-gn-1, 3 hours, 0 6.1 5.2 table 2 Table 3 Table 4 ten J fugues 2 $} and Mr. d.HM FSh.5