FR2534163A1 - CONTINUOUS CASTING LINGOTIERE ADJUSTING DEVICE - Google Patents

Abstract

1. Device for the adjustment, during casting, of a mould for the continuous casting of products of rectangular cross-section, comprising two small sides (7) inserted between two large sides (2, 3) and means of clamping the large sides, which are capable of being released to adjust the small sides (7) to a desired width, characterized in that the means of clamping the large sides (2, 3) comprise clamping means located respectively at an upper level (9) and a lower level (10), and separate means, adjustable differently, for controlling the relaxation of the pressure exerted respectively by the upper clamping means n9) and by the lower clamping means (10).

Description

Continuous casting mold control device This

  The invention relates to an adjusting device, during casting, of the short sides of an ingot mold for continuous casting of

  rectangular section products, such as a slab mold.

  Adjustable molds are known which comprise a device

  tif, usually with return cylinders, allowing very wide sides to be pushed aside while the desired adjustment is made to the short sides

  in order to change the width of the slab It is indeed necessary to

  sideways to slide between the long sides, which normally

  imprison them very closely, so as to avoid any risk

  seizing when adjusting width.

  Such a mode of operation can not be suitable when the adjustment is done during casting It can not indeed be tolerated play, otherwise a very small game, between small and large sides, because the steel

  liquid would be likely to infiltrate.

  When one wants, in the current state of the art, to modify

  the setting during casting, stops are installed which make it possible to

  when setting the width, a very small clearance between large and small sides In reality, this solution is not satisfactory, because

  the game in question is conditioned by the deformations of thermal origin

  that, so that the risks of seizure still exist.

  One could think to regulate the pressure on all the return cylinders so that big and small sides stay in contact, with a

  contact pressure sufficiently low that their relative displacements

  are possible without seizing.

  The tests carried out showed that this solution was not satisfactory. Indeed, in the mold the ferrostatic pressure acts, so that the distribution of the contact pressure between small and large sides deviates much from a uniform distribution. so

  risk of seizure, usually in the upper part of the short sides.

  The device of the invention does not have this kind of inconvenience.

  It is of the type comprising clamping devices allowing

  release, during the adjustment of the short sides to the desired width, the pressure

  sion on the long sides, and is characterized in that it is

  equipped with means for regulating differently the

  rage and lower clamping devices.

  The invention will be better understood from the following description

  1 of an exemplary embodiment, with reference to the accompanying drawings, in which: FIG. 1 is an elevational view of the adjustable mold including the device of the invention; FIG. 2 is a section in the direction AA of FIG.

  FIG. 3 is a schematic representation of the hydraulic circuit

  control of the cylinders equipping the device of the invention.

  Referring firstly to all of Figures 1 and 2, the ingotieer of the invention comprises a frame 1 which is fixed a large side 2 The second large side 3, rigidified by a plate 4, is movable The small c 8 tees 7 can move to change the width of the cast product, through conventional mechanisms 8 that have been schematized in form

of screws.

  To allow this adjustment operation during casting,

  two upper clamping devices 9 and two lower clamping devices

  10 allow to loosen and tighten the long side 3 against the short sides 7 The tightening is performed by elastic stacks 5,

  while loosening is controlled for the upper clamping devices.

  9 by two hydraulic cylinders 6, and for the clamping devices

  lower by hydraulic cylinders 11.

  According to the invention, the hydraulic control circuits of the cylinders 6 on the one hand, and the cylinders 1 1 on the other hand, are of separate settings It is thus possible to adjust the loosening of the long side 3 in order to avoid, while moving the short sides 7 during casting,

  jamming of these, despite the ferrostatic pressure and

thermal origin.

  FIG. 3 shows the hydraulic circuit enabling

  according to the invention, separate settings for the upper cylinders

  6 and lower cylinders 11.

  As can be seen in the drawing, the pipes 12 supplying

  the cylinders 6 are joined in a single pipe 13, and the pipes

  14 supplying the cylinders 11 are joined in a single pipe The pipes 13 and 15 each lead to pressure control valves, respectively 16 and 17, then they are combined into one

  pipe 18 on which the hydraulic pressure is applied or released.

  using a conventional electro-valve 19.

  In operation, that is to say during adjustment, the devices 16 and 17 will be adjusted so that the contact pressure between large and small sides has a given uniform value. It will be possible to adjust these pressures so that this contact pressure remains constant for

  different distances of the small sides.

Claims (3)

  1 Setting device during casting of the short sides of an ingot mold for continuous casting of rectangular section products, of the type comprising clamping devices (9, 10) for releasing, during adjustment of the short sides to the desired width , the pressure exerted on the long sides, characterized in that it is equipped with means (6, 11, 16 and 17) allowing   to adjust differently the upper clamping devices (9) and the   lower clamping forces (10).   2 adjusting device according to claim 1,   characterized by the fact that the upper clamping devices (9) and   bottom (10) each comprising at least one pair of cylinders, respectively (6) and (11), hydraulically actuated in the loosening direction, the loosening control circuit comprises two separate branches (13) and (15) of feeding two pairs of cylinders, respectively (6) and (11), each branch (13) or (15) being provided with pressure adjustment means, respectively (16) and (17).   3 adjusting device according to claim 2,   characterized by the fact that each branch of the control circuit of the   rage comprises a single pipe (13), (15) provided with a valve (16) (17) for adjusting the pressure and connected by pipes (12), (14) to the pair of corresponding cylinders (6), (11), the two pipes (13) and (15) being fed from a single pipe (18) provided with itself of a valve (19).