FR2672524A1 - LINGOTIERE FOR CONTINUOUS CASTING OF METAL PRODUCTS. - Google Patents

Abstract

The invention relates to an ingot mould (10) for continuous casting of metallic products, for example billets, blooms or slabs, comprising lubricant flow orifices (22) made in its inner face (14) forming a mould. These orifices (22) are uniformly spaced with respect to each other, along the perimeter of this inner face, and open out in concave recesses (24) made in this inner face and whose surface area is substantially greater than the cross-section of the said orifices. Preferably, vertical grooves (26) extend between each concave recess (24) and the lower end (20) of the ingot mould (10) in order to ensure the discharge of the excess lubricant and of the gases caused by the cracking of the lubricant.

Description

The present invention relates to an ingot mold

  for continuous casting of metal products.

  JP-A-60-221156 shows a mold for continuous casting having lubricant outlets, for example mineral oil, opening

on its inner face forming a mold.

  These orifices are distributed around the periphery and

  different heights of the inner face of the mold.

  A first set of orifices is disposed

  above the meniscus formed by the liquid metal which

  flows into the mold A second set of orifices

is disposed under this meniscus.

  In this case, the lubrication of the surface of the metal products that are molded in the mold,

  for example billets or blooms, is sensi-

  in the upper part of it.

  The inner side of the lower part of the lingo

  is subjected to friction from the metal product that leaves through the lower end of the mold, these friction being all the more intense that the mold has, in general, a cross section

  lower in the lower part than in the upper part.

  Moreover, the edges delimiting the edges of the lubrication holes on the internal face of the mold may catch the surface of the metal which solidifies along this inner face and in

affect the quality.

  The known lubrication devices do not provide

  usually not a sufficient diffusion of lubricant

  to allow the slipping of the metal into the mold at the speed usually required in a

continuous casting process.

  Therefore, it is known to improve the sliding of the metal in the mold by submitting

  this one with oscillations directed according to its height.

  In addition to its complexity and cost, this process has the disadvantage of showing wrinkles on the surface

  metal products shaped by the mold.

  The object of the invention is in particular to remedy these various drawbacks and to improve the efficiency of the

lubrication in the mold.

  It relates to a continuous casting mold comprising lubrication means comprising lubricant flow ports, in particular mineral oil, opening into its internal mold face and regularly spaced from each other around the periphery of this inner face, characterized in that the lubricant flow orifices open into concave recesses formed in this internal face and whose surface is substantially greater than the cross section of said orifices. According to other features of the invention: the mold has in its internal face

  grooves each of which extends substantially vertically

  between a concave recess and the lower end of the mold:

  the openings are located at a height of

  between one-third and two-thirds of the height of the mold;

  the concave recesses have a truncated shape

lunch;

  the lubricant is fed from the former

  lower end of the mold, by at least one main conduit connecting this lower end to an annular chamber lubricant distribution, arranged

  in the thickness of the wall of the mold,

  at the height of the orifices, and connected by secondary conduits to each of the outlets;

  Secondary ducts are sensitively oriented

  perpendicularly to the inner face of the mold.

  The invention will be described in more detail below.

  below with reference to the accompanying drawings, in which: Figure 1 is a partial sectional view of an ingot mold according to the invention; FIG. 2 is a view along line 2-2 of FIG. 1, the internal face of the mold being

represented in developed view.

  FIG. 1 shows an ingot mold 10 for forming metallic products, such as blooms, slabs or billets, a portion of which has been represented

wall 12.

  The inner face 14 of the wall 12 forms a mold for liquid metal 16 which is introduced from above

of the mold 10.

  The upper surface of the liquid metal in the

  ingot mold 10 forms a meniscus 18.

  A solidified metal skin 19, for example a billet in formation, is in contact with the face

  14 of the wall 12 This skin 19 will thicken

  from the surface of the meniscus 18, adjacent to the inner face 14, towards the lower end 20 of the

mold 10.

  The wall 12 of the mold 10 is of greater thickness at its lower end 20 than at its upper end 21 Thus, the inner face 14 of the

  wall 12 delimits a volume whose section goes into

increasing.

  As can be seen in FIGS. 1 and 2, lubrication orifices 22 regularly spaced between each other around the periphery of the internal face 14 are arranged at the same height between the first

  third and second third of the height of the mold.

  Each orifice opens into a recess

concave 24 of the inner face 14.

  Each concave recess 24 is centered on the orifice 22 which opens into it and has, for example, a frustoconical shape so that its edges form an angle

weak with the inner face 14.

  Grooves 26, dug in the inner face 14, extend substantially vertically, from each concave recess 24 to the lower end.

20 of the mold 10.

  A main pipe 28 for supplying lubricant

  such as mineral oil in the thicket

  12 of the wall 12, connects the lower end of the mold 10 to an annular distribution chamber 30, formed in the thickness of the wall 12, substantially at the

height of the orifices 22.

  Secondary conduits 32 connect each

  orifice 22 to the distribution chamber 30.

  For manufacturing convenience, the chamber 30 was made by digging a groove 34 all around the mold 10 and closing the groove at the outer face 36 of the wall 12, for example using

  elements 38 welded to the face 36 of the wall 12.

  In the figures, the proportions of the lubrication members such as the orifices 22, the concave recesses 24 and the grooves 26 have been exaggerated with respect to the dimension of the mold, for better

show their disposition.

  For an ingot mold used for the manufacture of billets with a cross section of 170 mm side, the orifices 22 have, for example, a diameter of between 0.5 and 1 mm, and are spaced apart by 5 mm.

  grooves are, for example, 1 mm wide.

  The lubrication means described above

  are used to lubricate the lower part of mold 10.

  This usually comprises lubricating means

  cation at its meniscus, which are known and therefore not described, which are used in a complementary manner with the lubricating means according to the invention. The supply of lubricant lubricating means according to the invention is by the lower end 20 of the mold, through the main conduit 28 The lubricant flows at the inner surface

  14 through the orifices 22 The concave recesses 24

  a good diffusion of the lubricant.

  The grooves 26 make it possible to evacuate the excess lubricant emerging from the orifices 22 as well as the gases produced by the cracking of the oil in contact with the metal.

hot.

  Lubrication of the lower part of the lingo

  10 is much more effective than in the United States.

  Known elements The sliding of the cast metal is improved in such a way that it can be envisaged to eliminate the oscillation means of the mold. The wrinkles on the surface of the cast metal, due to these oscillations, are thus avoided or at least attenuated. and the mold has a

longer life.

  It will also be appreciated that these results are achieved by simple and relatively inexpensive means.

  whose implementation is particularly easy.

Claims (6)

  An ingot mold for continuous casting of metal products, comprising lubricating means comprising orifices (22) for the flow of lubricant, in particular mineral oil, formed in its wall (12) and opening into its inner face (14) forming a mold , these orifices being regularly spaced apart around the periphery of this internal face, characterized in that the orifices (22) open into concave recesses (24) formed in this inner face and whose surface   is substantially greater than the section of the aforesaid these.   Ingot mold according to claim 1, characterized   in that it has in its internal face (14) grooves (26) each of which extends substantially   vertically between a concave recess (24) and the end   lower mold (20).   Ingot mold according to claim 2, characterized   in that the orifices (22) are situated at a height of between one-third and two-thirds of the height of the mold.   4 Ingot mold according to any one of the   cations, characterized in that the recesses   Concave elements (24) have a frustoconical shape.   Ingot mold according to claim 2, characterized   in that the lubricant is supplied from its lower end (20) by at least one main duct (28) connecting this lower end (20) to an annular distribution chamber (30) of the lubricant,   formed in the thickness of the wall (12) of the ingot mold.   re, substantially at the height of the orifices (22) and connected by secondary ducts (32) to each of the orifices (22) flow.   Ingot mold according to claim 5, characterized   in that the secondary ducts (32) are oriented substantially perpendicular to the face internal (14) of the mold.