SU1687365A1 - Device for reciprocating movement of continuous casting mould - Google Patents

Abstract

This invention relates to metallurgy, in particular to continuous casting machines. The purpose of the invention is to reduce the size and expand the technological capabilities of the device. The device includes a frame for the mold, supported by flexible elements — springs, and a drive New in the device is an increase in flexible elements with different stiffness. 1 il.

Description

This invention relates to metallurgy, in particular to continuous casting machines.

The aim of the invention is to reduce the size and expansion of technological capabilities.

The drawing schematically shows the proposed device, side view.

The device consists of a swinging frame 1 with a mold 2 installed on it. Frame 1 rests on elastic elements 3 and 4, made in the form of springs. The actuator 5 is pivotally connected to the mold 2.

The device works as follows.

When the frame 1 with the mold 2 is moved downward, the springs in the supports 3 and 4 are deformed. Moreover, the spring in support 3 is deformed to a lesser extent than the spring in support 4, i.e. h3 - ru. The mold 2 will move along a curved path with a radius of curvature Rn relative to

point O, then when on frame 1 the points of attachment of springs to supports 3 and 4 will also move along a curvilinear trajectory with a radius of curvature of HziRz relative to the same center of curvature of point O.

This condition will be observed when the deformations of the springs in the supports 3 and 4 are directly proportional to the radii of curvature of the trajectory along which they move, i.e.

From RJh / i

This condition will be observed when the mold 2 moves upwards. Thus, the mold will move along a predetermined curved path.

The deformations are inversely proportional to the ir-hardness and directly proportional to the forces acting on them. From this it follows that the stiffness of the elastic elements in the rigging of the rigidity of the congestion at certain loadings is reversible to

WITH

with

about with

CJ

about

(L

the radii of curvature of the trajectory along which they move:

zj Ra

23 R4

In the general case, the coordinate of the elastic element relative to the trajectory of the mold axis will also affect the deformation. Therefore, if the mass of moving parts is taken equal to unity, then the deformations in the supports will be

34 L az

Bs

h4

(az + 34) gz (az + a) Z4

where az and 34 are the coordinates of the elastic elements 3 and 4 relative to the trajectory of the axis of the mold. It follows that

Bz fa 34. az

h4 R4 (az + 34jz3 (az + 34) Z4

 34 Z4 33Z3

Example. Caster radial type with a radius of curvature of the technological axis m for blanks with a section of 125x125 mm through the mold mass of kg. The distance between the supports of the mold mm.

Mold progress mm.

R3 Ro-az 6000-500-5500 mm;

R4 R0-t- 34 6000 + 500 6500 mm.

The stiffness and working stroke of the springs in supports 3 and 4 are as follows:

LZ R3. u R3 10 5500., p;, b3 b01-12-125-11

mm

  12

13 mm

 QX-1 2 x h3

ABOUT

y x

6500 Ro 6000

1000 1 hp / ic / - - x -th 45.45 kg / mm;

1000. 1

x - 38.46 kg / mm.

Jl

B4 2 support 3 must be installed

spring, designed for operating force -k- -2-500 kg, working stroke 11 mm and 45.45

tbnost- Shb than stiffness in the support 4.

In support 4, the spring should be selected for a working force of 500 kg, working stroke 13 mm and rigidity 1.182 times less than rigidity in support 3. When installing springs with selected characteristics, the mold will reciprocate along a circular arc with a radius of m.

The same device can also be used on a continuous casting machine with a different curvature of the technological axis, if we replace the springs in the mold supports in accordance with

1.182 times more

changes in the initial conditions of the reciprocating motion.

For example, for rocking the mold along an arc of radius m with other data h 0 10 mm, az 34 600 mm; Q 2000 kg is required mm, RV8600 mm;

7400

8,000

 9.25 mm

ten

.g 10.75 x -Q-JT 108.1 kg / mm;

15

х - 93.02 kg / mm 1U, / 5

20

25

thirty

35

40

45

50

55

In addition to the considered example, when, in which the layout solution of the device is simplified, two other cases are possible. This simplifies the design of the device due to the unification of the supports of the mold.

In addition, if the spring stiffnesses in the supports will be the same and the supports will be at the same distance from the center of gravity of the movable swing system, the mold will move in a straight line, and at different distances x in a curve.

R of the proposed device, the weight and dimensions are reduced by about 2.5 times due to the fact that the reciprocating movement of the mold will be carried out by swinging only one frame.

Since the springs in the mold supports are subject to pre-deformation by a force greater than the mass of moving parts and friction force in the mold, the gaps in the kinematic pairs of the drive are selected to one side and they will not play a negative role during the reciprocating movement of the mold. Therefore, there are no obstacles to the operation of the device in the high-frequency rolling mode of 100–120 or more cycles per minute. In this case, the stroke of the mold can be both small (1-4) mm and large (up to 20 mm).

The device can be used in modes of operation that combine different values of the amplitude and oscillation frequency of the mold. This expands the technological capabilities of the device. The maximum casting speed, high surface quality and minimum lubricant consumption in the mold can be determined as functions of two variables - the frequency of the swing cycles and the stroke of the mold. Moreover, the device allows these parameters to be selected in a wide range of values. The presence of springs in the supports along the forming preform and thereby reducing the friction of the ingot crust against the walls of the mold, which helps to reduce the number of breakouts.

Claims (1)

Apparatus of the Invention A device for reciprocating a mold, comprising a frame for mounting a mold, supported on elastic elements, and an actuator, characterized in that, in order to reduce overall dimensions and expand the process capabilities, the elastic elements are made in the form of springs, in which the stiffness and the distance between their supports and the axis of the crystallizer are related by the dependence 2з az FU Z4 34 R3 where gz and z4 - spring stiffness; a and a are the distances the springs are removed from the axis of the mold; R3 and Poison are the distances the springs are removed from the point of movement of the mold frame. 15 four