Patent EA-000180-B1 (EA)
Title: Casting mould for use in the aluminothermic welding together of rails
Inventor: KUSTER FRANK
IPC: B23K23/00
Filed: 1996-11-06
Abstract: 1. Casting mould for welding rail ends (1, 2) using weld metal, said casting mould comprising two identical halves made of heat-resisting material and with a gap therebetween to be welded, wherein the cavity is limited by the rail ends (1, 2), a system of risers is provided in the casting mould the area of their cross-section being A, and air ducts (10), the area of their cross-section being correspondingly B, while, the welding gap and an influx (4) having the width WB are located symmetrically towards the vertical cross medium plane (3), and besides risers (9), air ducts (10) are located symmetrical towards the vertical longitudinal medium plane (5) of the rail ends (1, 2), characterized in that the centre of gravity of at least one riser of the A area lying on one side from the longitudinal medium plane (5) is spaced at Casting mould according to Claims 1-12, characterized in that such distance y from the side (11) of the rail bottom (8) which is determined depending on the width FB of the rail bottom (8) and that the B area of at least one air duct (10) lying on one side from the longitudinal medium plane (5) is chosen depending on the A area of the riser (9) wherein y value ranges from 0.0025 FB to 0.0004 FB and B/2 is between 0.05 to 20.00 A. 2. Casting mould according to Claim 1, characterized in that the centre of gravity of the B area of the air duct (10) is spaced at a distance x from the influx top (4), which is determined based on the width FB of the rail bottom (8), wherein x value ranges from 0.25 FB to 0.350 FB. 3. Casting mould according to Claim 1, characterized in that at least one air duct (10) is provided along each side from the cross medium plane (3) and at least two air ducts (10) are spaced at a distance z from each other and said distance depends on the width WB of the influx (4) wherein z value ranges from 0.25 WB to 0.95 WB. 4. Casting mould according to Claims 1-3, characterized in that y value ranges from 0.010 FB to 0.325 FB. 5. Casting mould according to Claims 1-4, characterized in that x value ranges from 0.010 FB to 0.25 FB. 6. Casting mould according to Claims 1-5, characterized in that z value ranges from 0.1 WB to 0.9 WB. 7. Casting mould according to Claims 1-6, characterized in that B/2 value ranges from 0.05 A to 0.75 A. 8. Casting mould according to Claims 1-7, characterized in that y value ranges from 0.05 FB to 0.25 FB. 9. Casting mould according to Claims 1-8, characterized in that x value ranges from 0.05 FB to 0.20 FB. 10. Casting mould according to Claims 1-9, characterized in that z value ranges from 0.4 WB to 0.8 WB. 11. Casting mould according to Claims 1-10, characterized in that y value ranges from 0.075 FB to 0.200 FB. 12. Casting mould according to Claims 1-11, characterized in that x value ranges from 0.075 FB to 0.150 FB. 13. Casting mould according to Claims 1-12, characterized in that z value ranges from 0.55 WB to 0.70 WB. 14. Casting mould according to Claims 1-13, characterized in that the gap between the rail ends (1, 2) determines the size of the welding space, which is from 25 mm to 40 mm wide.