Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
  • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
  • B22D11/0637—Accessories therefor
  • B22D11/0648—Casting surfaces
  • B22D11/066—Side dams

Definitions

• the invention relates to a method for operating a strip casting machine for producing a metal strip according to the preamble of claim 1 and a device for performing the method.
• sealing plates When casting between two casting rolls forming a casting gap, sealing plates are placed against the end faces of the casting rolls in order to limit and hold the molten metal between the rolls.
• the refractory sealing plates are usually pressed against the rotating casters.
• the sealing surfaces are exposed to high wear. In the area of the sealing edges, undesired partial solidifications can occur, which in turn lead to damage to the sealing plates along the roller edges.
• the washing out or removal of the sealing plates in the edge area of the casting rolls leads to poor casting edges of the metal strip and to the formation of fins in this area.
• the resulting metal strip with possible fins can, on the one hand, cause further wear on the sealing plates, on the other hand, edge cracks can occur in the metal strip, which make substantial trimming cuts unavoidable and thus result in yield losses, which impairs the economic efficiency of the process.
• the object of the present invention is to propose a method of the type mentioned at the outset and to provide an apparatus for carrying out the method, with which the strip edge quality can be significantly improved and the economy of the method can be increased.
• the sealing plates are moved oscillatingly in and against the direction of rotation of the casting rolls during the casting operation, the movement taking place alternately along one or the other casting roll edge, the partial solidification in their formation can be largely prevented and at most stripped off, and the resultant Metal tape gets clean tape edges.
• Belt edge cracks and strong signs of wear on the sealing plates are avoided, which increases the cost-effectiveness of the process (yield losses due to substantial trimming cuts are eliminated, and longer casting sequences are possible).
• FIG. 1 shows a perspective illustration of a first exemplary embodiment of a device for generating oscillating movements on side seals of a roller band casting machine
• FIG. 2 shows a part of the roller band casting machine with the device according to FIG. 1 in a section
• FIG. 3 shows a part of the roller band casting machine with the device according to FIG. 1 in a side view
• Fig. 4 schematically shows a side seal
• 5 schematically shows the side seal according to FIG. 4 during the oscillating movement along a first casting roller edge
• 6 shows schematically the side seal according to FIG. 4 during the oscillating movement along a second casting roller edge
• FIG. 7 shows a lower part of the device according to FIG. 1 in a perspective illustration and in partial section
• FIG. 8 shows the part of Figure 7 in plan view.
• 9 shows an upper part of the device according to FIG. 1 in a perspective illustration and in partial section; 10 shows the part according to FIG. 9 in plan view; and
• FIG. 11 shows a perspective illustration of a second exemplary embodiment of a device for generating oscillating movements on side seals of a roller band casting machine.
• FIG. 1 to 3 show a device 1 for generating oscillating movements on side seals 2 of a roller band casting machine, which is provided for the production of a metal strip by continuously pouring molten metal between two casting rollers forming a casting gap.
• the casting rolls are shown in FIG. 2 and are designated by reference numbers 3, 4.
• Two side seals 2 arranged on both end faces of the casting rolls 3, 4 limit the length of the casting gap and thus determine the width of the metal strip to be produced.
• a device 1 is provided for each side seal 2.
• the side seals 2 each comprise a refractory sealing plate 2b accommodated in a holding frame 2a (cf. FIG. 3), which is actuated by means of an adjusting device 5 which is known per se and is therefore not further described. gene the end faces 3a, 4a of the casting rolls 3, 4 is adjustable.
• the adjusting device 5 is arranged on a frame 6.
• the adjusting device 5 is assigned a base plate 10 of the device 1. On the base plate 10 on the one hand and on the holding frame 2a of the side seal 2 on the other hand, a fork-shaped holder 11, 12 is attached, the vertically extending legs of which are each connected to one another by a horizontally directed transverse bolt 13, 14.
• a substantially vertically oriented piston / cylinder unit is attached to the two transverse bolts 13, 14 and is easily pivotable in a vertical plane parallel to the base plate 10 and to the side seal 2, for which purpose the inner surfaces of the legs on both brackets 11, 12 can be slightly convex, for example.
• the piston / cylinder unit which is operatively connected to a drive in a manner not shown, is intended to give the side seal 2 an oscillating movement with its lifting / lowering movement, which, however, according to the invention is not vertical, but in and against the direction of rotation U 3 or U 4 (FIG. 2) of the casting rolls 3, 4 runs alternately along one or the other casting roll edge 3k or 4k, as illustrated in FIGS. 5 and 6.
• U 3 or U 4 FIG. 2
• each point of the so-called sealing holding area 7 of the sealing plate 2b is moved from a neutral position c into an oscillating movement on the circumference of a circle with a center D 3 (axis of rotation of the casting roll 3) and with the roll radius a in Direction of rotation U 3 , ie in the casting direction, to bottom dead center d and backwards, counter to the direction of rotation U 3 , to top dead center b.
• FIG. 6 shows that each point of the sealing area 7 from a neutral position f on the circumference of a circle with a center D 4 (axis of rotation of the casting roller 4) and with the roller radius a in the direction of rotation U 4 between a bottom dead center g and an upper one Dead center e can oscillate.
• the side seal 2 on the one hand and the stationary base plate 10 on the other hand are guide elements. elements assigned, a first part for guiding the side seal 2 along the one casting roll edge 3k and a second part for guiding the side seal 2 along the other casting roll edge 4k. Adjustment means are also provided, by means of which the first or the second part of the guide elements can be used alternately.
• three position cylinders 20, 23, 24 are attached, preferably screwed on, one of which, the position cylinder 20, is arranged in the lower region of the device 1 such that its axis in the area of the casting gap, ie essentially in a plane common to the two casting roller axes D 3 , D 4 .
• the two other position cylinders 23, 24 are positioned symmetrically in relation to the vertical center plane of the base plate 10 or the side seal 2 in the upper area of the device 1, ie they are assigned to the expanded area of the side seal 2 and are located on both sides of the fork-shaped holder 11 for the piston / cylinder unit.
• the lower position cylinder 20 is provided with a holder 25 for two mutually facing guide cylinders 33, 34 which are arranged at right angles to the position cylinder 20 and whose adjustable pistons 33a, 34a each serve as carriers for a guide roller 35, 36.
• the guide rollers 35, 36 are rotatably mounted on bolts 35a, 36a which are directed at right angles to the pistons 33a, 34a and connected to them.
• the guide rollers 35, 36 can be pressed from both sides onto a lower circular guide 40, preferably screwed on, mounted on the side seal 2 or on its holding frame 2a.
• the circular guide 40 has outer or guide surfaces 41, 42 which are rounded in cross section and which interact with correspondingly shaped peripheral surfaces 35u, 36u of the guide rollers 35, 36.
• the lower position cylinder 20 and the lower circular guide 40 are arranged below the lower bracket 12 for the piston / cylinder unit 15.
• a guide cylinder 43, 44 (cf. in particular FIG. 2) is also held on the upper position cylinders 23, 24, the pistons 43a, 44a of which each serve as a carrier for a guide roller 45, 46.
• the guide rollers 45, 46 are in turn rotatably mounted on bolts 45a, 46a which are at right angles to the pistons 43a, 44a (cf. FIGS. 7 and 8).
• two upper circular guides 51, 52 are attached, preferably screwed, in the upper region, each of which is provided with a lateral guide surface 53, 54 directed towards the outer edge of the side seal 2.
• the curved guide surfaces 53, 54 which are curved outwards in cross section each interact with correspondingly shaped peripheral surfaces 45u, 46u of the guide rollers 45, 46.
• the upper circular guides 51, 52 are arranged such that their guide surfaces 53, 54 each lie on the circumference of the previously mentioned circle with the radius a and center D 3 (circular guide 51) and D 4 (circular guide 52).
• the respective outer surface 41 and 42 of the lower circular guide 40 is also located on the circumference of the respective circle.
• the upper guide cylinders 43, 44 are directed such that when their pistons 43a, 44a are adjusted, the guide rollers 45, 46 are at right angles to the corresponding guide surfaces 53 , 54 can be adjusted and brought into tangential contact with them.
• pistons 33a, 43a and pistons 34a, 44a are actuated alternately according to the invention and thus the guide rollers 35, 45 are pressed alternately on guide surfaces 41, 53 and guide rollers 36, 46 on guide surfaces 42, 54, as a result of which the oscillating lifting / lowering movement of the pistons / Cylinder unit 15 alternately offset the side seal 2 in oscillation according to FIG. 5 and in oscillation according to FIG. 6.
• two separate circular guides, each with an outer surface could of course also be mounted on the holding frame 2a.
• the oscillation frequency can be varied, with the movement of the side seals 2 or of the refractory sealing plates 2b integrated in them in the direction of rotation U 3 or U 4 of the casting rolls 3, 4, ie in the casting direction, slightly faster, at the same speed or even considerably slower can be as the movement of the rotating surface of the casting rolls 3, 4. In other words: it can be a minimal lead, a synchronization or possibly even a substantial lag.
• the movement of the sealing plates 2b against the direction of rotation U 3 or U of the casting rolls 3, 4, that is to say the retraction movement, can take place faster, at the same speed, or also significantly more slowly than the movement of the casting direction mentioned above.
• the oscillation frequency can vary depending on the casting speed. For simple control, however, the oscillation frequency can also be determined using a conventional casting speed.
• the stroke of the sealing plates 2b can advantageously be ⁇ 0.5 to ⁇ 10 mm and be driven at a speed which can be up to 10% faster during the casting direction movement and up to 10 times slower during the retraction movement.
• the side seals 2 or the refractory sealing plates 2b integrated therein oscillate during the casting operation in and against the direction of rotation U 3 or U 4 of the casting rolls 3, 4, the movement taking place alternately along one or the other casting roll edge 3k, 4k, the partial solidification in their formation can be largely prevented and at most stripped off, and the resulting metal strip receives clean strip edges.
• the band edge cracks and strong signs of wear on the sealing plates 2b are avoided, which increases the cost-effectiveness of the process (loss in yield due to substantial trimming cuts are eliminated, and longer casting sequences are possible).
• FIG. 11 shows a further embodiment of a device 1 ′ for generating oscillating movements on side seals of a roller band casting machine. It in turn has a stationary base plate 100, opposite which a further plate 102 connected to the side seal is movably arranged.
• the side seal itself is not shown in FIG. 1, but the plate 102 is attached to the already mentioned holding frame of the side seal which receives a sealing plate.
• the movable plate 102 has on its outer circumference two lateral guide surfaces 103, 104, each on the circumference of a circle with the casting roll radius a and a center D 3 or D 4 corresponding to the axis of rotation of the respective casting roll 3 or 4 (see FIG. 4 and Fig. 5).
• the guide surfaces 103, 104 are operatively connected to two guide roller pairs 105, 106, 107, 108 which are attached to the stationary base plate 100 and are arranged symmetrically to the vertical central plane of the base plate, of which one pair of guide rollers 105, 106 in a lower pair and the other pair of guide rollers 107, 108 in an upper, extended area are arranged.
• a recess 110 which is symmetrical with respect to its vertical center plane and into which two eccentrics 111, 112 protrude from behind, through the base plate 100.
• the eccentric 111, 112 can not be seen from the drawing and itself Drive located outside the hot area via a drive shaft 113 and a gear transmission 114, 115; 116, 117 are driven in opposite directions.
• the gearwheel 114 is arranged on the drive shaft 113, the gearwheel 115 which engages with it sits on a shaft assigned to the eccentric 111 and mounted in a holder 120, on which a further gearwheel 116 is also arranged which is in engagement with a gear 117 driving the other eccentric 112.
• the two eccentrics 111, 112 and the inner surfaces of the recess 110 are positively matched to one another such that when the eccentrics 111, 112 rotate, the movable plate 102 with its guide surfaces 103, 104 is in constant contact with the lower guide rollers 105, 106 remains, but is pressed alternately on one or the other upper guide roller 107, 108.
• the plate 102 and with it the side seal performs a kind of oscillating V movement, alternately along one or the other cast roller edge 3k or 4k.
• the stroke of the sealing plates can preferably be between 0 and 1 mm to between 0 and 20 mm.
• the side seal with the movable plate 102 and the base plate 100 with the holder 120 and the gearwheels 115, 116, 117 mounted therein form a unit which, after preheating, from below for the fixed drive or for the gearwheel 114 arranged on the drive shaft 113 is retracted, the gear 115 being brought into engagement with the fixed gear 114.
• the two upper guide rollers 107, 108 according to FIG. 11 could be omitted and the guidance of the movable plate 102 by the two eccentrics 111, 112 engaging in the recess 110.
• the plate 102 would then be held and guided on the one hand by these eccentrics 111, 112 and on the other hand by the two guide rollers 105, 106 located at the lower end.
• a spring element advantageously a compression spring, can be arranged between the plate 102 and the base plate 100, which causes the movable plate 102 with the inner surfaces of its recess 110 to always be pressed downward against the eccentric, so that the positive engagement is free of play Eccentric is guaranteed.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Continuous Casting (AREA)
• Winding, Rewinding, Material Storage Devices (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=34427746

Family Applications (1)

Country Status (7)

Families Citing this family (8)

Family Cites Families (6)

• 2003
  • 2003-10-08 CH CH01708/03A patent/CH696756A5/de not_active IP Right Cessation
• 2004
  • 2004-10-07 AT AT04765871T patent/ATE350185T1/de active
  • 2004-10-07 EP EP04765871A patent/EP1670603B1/fr not_active Expired - Lifetime
  • 2004-10-07 CN CNB2004800295303A patent/CN100384566C/zh not_active Expired - Fee Related
  • 2004-10-07 DE DE502004002581T patent/DE502004002581D1/de not_active Expired - Lifetime
  • 2004-10-07 US US10/573,249 patent/US7594534B2/en not_active Expired - Fee Related
  • 2004-10-07 WO PCT/EP2004/011210 patent/WO2005035170A1/fr active IP Right Grant

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events