Gus C Sevastakis

US Patent:

44718306, Sep 18, 1984

Filed:

Oct 31, 1979

Appl. No.:

6/090049

Inventors:

Gus Sevastakis - Toledo OH

International Classification:

B22D 1100

US Classification:

164421

Abstract:

In the art of continuous vertical casting, an improved cooler assembly surrounds the forming die through which molten metal is poured for forming elongated metallic bar products which may be solid or hollow. The cooler assembly includes a cooling sleeve surrounding the die in continuous intimate contact; and a jacket surrounding the cooling sleeve and spaced therefrom to provide space for receiving a coolant. Along a substantial intermediate length of the cooling sleeve is formed a continuous helical or spiral groove for controlling the flow of coolant from the bottom to the top of the cooler assembly while increasing surface contact of the coolant with the cooling sleeve and the jacket itself. Coolant is introduced into and discharged from the cooler assembly at an oblique angle to initiate helical flow of the coolant about the sleeve and also avoid cold spots and consequently grain and strength imperfections in the bar product being cast. The upper and lower ends of the cooling sleeve in its inner regions adjacent the die are recessed to control the heating and cooling of the cooling sleeve itself to avoid warpage of the cooling sleeve which can harmfully unseat the die, to avoid rupture of the welds which fasten the cooling sleeve to the jacket, and to protect the inner edge of the cooling sleeve from damage during handling a set-up time.

US Patent:

41789822, Dec 18, 1979

Filed:

Oct 28, 1977

Appl. No.:

5/846423

Inventors:

Gus Sevastakis - Toledo OH

International Classification:

B22D 1104

US Classification:

164 85

Abstract:

Method and apparatus for continuously casting hollow bars in which a one-piece mandrel is suspended from a support bar secured across the top of a female die by a retaining ring which holds down the female die. A cooler surrounds the female die and the retaining ring is fixed to the cooler. The mandrel extends axially within the female die, and the mandrel support bar leaves relatively large crescent-shaped pouring areas permitting easy access by a pouring spout which dispenses molten metal directly into the space between the female die and the mandrel. Quick connect and disconnect fasteners are employed to secure the support bar to the retaining ring so as to facilitate replacement of the mandrel during a casting operation. A pair of guide pins is also provided to facilitate and center installation of the mandrel.

US Patent:

47067349, Nov 17, 1987

Filed:

Jun 18, 1986

Appl. No.:

6/876303

Inventors:

Gus Sevastakis - Toledo OH

International Classification:

B22D 11124

US Classification:

164443

Abstract:

A continuous casting apparatus comprising a graphite die having an opening therethrough which has an elongated cross section and a cooler body surrounding and supporting the die. The cooler body or graphite die has a plurality of axially extending coolant passages in transversely spaced relation along each of the long sides of the elongated opening. Each coolant passage has an inlet end and an outlet end and the length of the coolant passages decreases progressively from the passage nearest the center to the end of the elongated openings.

US Patent:

44361432, Mar 13, 1984

Filed:

Jun 7, 1983

Appl. No.:

6/500227

Inventors:

Gus Sevastakis - Toledo OH

International Classification:

B22D 1100

US Classification:

164440

Abstract:

A horizontal continuous casting apparatus comprising a furnace having a bottom wall, side walls and a top wall. A holding block is supported within the furnace and has a vertical opening and a horizontal opening communicating with the vertical opening, the vertical opening extending upwardly. A crucible is mounted within the furnace and has a downwardly extending opening. A vertical adapter provides communication between the opening of the crucible and the vertical opening of the holding block. A side wall of the furnace has a horizontal opening. A horizontal adapter provides communication between the horizontal opening of the holding block and a die associated with the horizontal opening. The die extends externally of the furnace and a cooling device is associated with the die such that molten metal passes downwardly from the crucible through the vertical opening and horizontal opening of the holding block and, in turn, through the die wherein the cooling device functions to progressively solidify the metal as it is removed from the die.

US Patent:

45358320, Aug 20, 1985

Filed:

Dec 8, 1983

Appl. No.:

6/559276

Inventors:

Gus Sevastakis - Toledo OH

International Classification:

B22D 1100
B22D 1104

US Classification:

164421

Abstract:

For use in a continuous casting apparatus wherein molten metal flows through a die progressively and is solidified in the die and withdrawn from the die, a die and cooling assembly comprising a tubular die having an external tapered surface which is uniformly tapered radially inwardly in the direction of movement of metal to the die, a cooling sleeve having an internal surface complementary to the external surface of the die and in substantial contact with the external surface of the die and an annular cooling jacket wall surrounding the cooling sleeve and having portions thereof spaced from the sleeve to define a cooling chamber. At least one coolant inlet is provided to the chamber and at least one coolant outlet is provided from the chamber. The inlet and outlet are spaced axially with the outlet being nearest the upper end of the die where the molten metal enters the die and the inlet being nearest the lower end of the die where the solidified metal leaves the die. The cooling sleeve has a plurality of circumferentially spaced integral ribs extending radially outwardly therefrom into close proximity to the inner surface of the cooling jacket wall such that coolant flows in a thin layer along the inner surface of the cooling jacket and in a plurality of axial paths along the surfaces of the ribs.

US Patent:

41517652, May 1, 1979

Filed:

Dec 5, 1977

Appl. No.:

5/857238

Inventors:

Gus Sevastakis - Toledo OH

International Classification:

B23B 100
B23B 538

US Classification:

82 1C

Abstract:

Matching tapered surfaces are cut on male and female parts to be interfitted along the tapered surfaces by utilizing a lathe, having a motor driven tail stock opposite a conventional head stock, with the tail stock being mounted relative to the bed of the lathe for adjustable movement to position the tail stock at a desired taper angle relative to the longitudinal centerline of the lathe. The tail stock is equipped with a "direct mounting" chuck having jaws for holding the parts during the taper cutting operation. In one operation, the male part, which is hollow, is gripped internally thereof by the tail stock chuck, and the taper is cut on the external surface of the part by movement of the cutting tool in a horizontal plane parallel to the centerline of the lathe. Since the tail stock has been preset at the desired tapered angle, the external surface of the male part will be cut with the desired taper. The male part is then removed from the chuck and then the female part is mounted on the chuck of the tail stock by engaging the jaws of the chuck on the external surface of the female part.

US Patent:

46403370, Feb 3, 1987

Filed:

May 1, 1985

Appl. No.:

6/729246

Inventors:

Gus Sevastakis - Toledo OH

International Classification:

B22D 11124

US Classification:

164443

Abstract:

A continuous casting apparatus comprising a cooler body surrounding a graphite die. Alternatively, the cooler body itself defines the opening through which molten metal is passed. The cooler body has a plurality of integral grooves on an outer surface thereof defining ribs, and a shell or a plate encloses the grooves to define axial passages. The ribs have longitudinally spaced recesses in the form of semicircles on the edge of the ribs and indentations greater than the depth of the rib, whereby coolant moving along the axial passages is subjected to a turbulent flow. The coolant moving along the ribs enters the recesses and indentations and expands from the heat and is forced out to provide a continuous agitation of the coolant flow changing the speed of the moving coolant along the ribs for better heat transfer from the cooler body to coolant liquid. The coolant entering the axial passages from the end of the ribs is subjected to more turbulent flow by entering the enlarged section of the axial passages and more agitation is provided for better heat transfer from the increased cooling area and consequently better results are achieved in the cast products.

US Patent:

49017837, Feb 20, 1990

Filed:

Apr 20, 1989

Appl. No.:

7/342636

Inventors:

Gus Sevastakis - Toledo OH

International Classification:

B22D 1104

US Classification:

164421

Abstract:

A continuous casting apparatus wherein molten metal flows through a die progressively and is solidified in the die and withdrawn from the die comprising a die and cooling assembly including a tubular die having an external tapered surface which is uniformly tapered radially inwardly in the direction of movement of metal to the die, a cooling sleeve having an internal surface complementary to the external surface of the die and in substantial intimate surface contact with the external surface of the die, an annular cooling shell surrounding the cooling sleeve and having portions thereof spaced from the sleeve to define a cooling chamber, and at least one inlet to the chamber, at least one outlet from the chamber. The tubular die has an internal surface which is uniformly tapered radially inward in the direction of movement of metal to the die such that as the molten metal flows progressively through the die and is solidified and contracts, substantially intimate contact is maintained between the internal surface of the tubular die and the solidified metal so that improved heat transfer is achieved. The tubular die has a greater external diameter before assembly than the internal diameter of the cooling sleeve before assembly and the cooling sleeve is shrunk fit on the tubular die such that the tubular die is in compression at ambient temperature and the strength of the die is increased and such that as the cooling sleeve temperature increases in usage, intimate contact is maintained between the cooling sleeve and the die.