A process for manufacturing a non-stick steel powder metallurgy tundish nozzle flange

Abstract

The present invention relates to a process for manufacturing a nozzle flange of a powder metallurgy tundish of non-stick steel, which is characterized by: step 1, selecting a cast iron material, first turning it into a round cake shape with a maximum bottom diameter of 200 mm, a conical shape above the round cake shape, and a thickness of the overall basic shape of 48 mm; step 2, finding the center point of the basic shape, turning the bottom surface into a truncated cone shape with an inner hole diameter of 116 mm, a thickness of the truncated cone shape of 4 mm, and an inclination angle of a transition surface between the truncated cone shape and the bottom surface of 45 degrees; step 3, the truncated cone shape is away from the bottom A conical structure is provided at the position of the surface, the diameter of the bottom surface of the conical structure close to the cone is 68.5mm, and the diameter of the conical structure away from the top of the cone is 30mm; step four, the outer diameter of the conical structure is 96mm, and the angle between the inclined surface of the conical structure and the horizontal plane is 45 degrees; step five, three threaded holes with a diameter of 19mm and a spacing angle of 120 degrees are drilled at a position with a center diameter of 160mm; step six, one of the threaded holes is repositioned 60 degrees to drill three 16mm diameter secondary threaded holes.

Description

Technical Field

[0001] The invention belongs to the technical field of tundishes, and in particular relates to a process for manufacturing a nozzle flange of a non-stick steel powder metallurgy tundish. Background Art

[0002] With the increasing requirements for steel quality, various ladle refining technologies have been developed, the purpose of which is to improve the cleanliness and purify the molten steel. The molten steel after refining outside the furnace still cannot meet the requirements of molten steel for powder metallurgy. However, it may be contaminated again when poured into the tundish. Therefore, the tundish cannot be regarded as a simple molten steel transition container, but should be regarded as a continuous metallurgical reactor. The measures adopted in ladle refining can be transplanted to the tundish to further purify the molten steel. For this reason, the concept of tundish metallurgy was proposed and received attention.

[0003] At present, most of the powder metallurgy manufacturers in the world choose stainless steel as the material of the tundish flange nozzle. Because of its high melting point, it is not easily scalded by high-temperature molten steel. However, it has a fatal defect that it is easy to stick to steel powder and cause cold steel at the nozzle: when the powder is atomized in the tundish, the temperature of the molten steel is extremely high, generally above 1520℃. When high-pressure nitrogen is atomized, a vacuum area is easily generated, causing the high-temperature steel powder to splash back onto the nozzle flange of the tundish, and then adhere to it to form a long cone of cold steel, which poses a major safety hazard. Therefore, it is necessary to design a non-stick steel powder metallurgy tundish nozzle flange manufacturing process to solve the above problem. Summary of the invention

[0004] The purpose of the present invention is to provide a process for manufacturing a nozzle flange of a powder metallurgy tundish of non-stick steel in view of the technical problems existing in the prior art. The specific technical scheme is as follows:

[0005] The present invention provides a process for manufacturing a nozzle flange of a powder metallurgy tundish of non-stick steel, and the specific processing steps are as follows: step 1, select a cast iron material, first turn it into a round cake shape with a maximum bottom diameter of 200 mm, and there is a conical shape above the round cake shape, and the thickness of the overall basic shape is 48 mm; step 2, find the center point of the basic shape, turn the bottom surface into a truncated cone shape with an inner hole diameter of 116 mm, the thickness of the truncated cone shape is 4 mm, and the inclination angle of the transition surface between the truncated cone shape and the bottom surface is 45 degrees; step 3, a conical structure is provided at a position of the truncated cone away from the bottom surface, and the conical structure The interior of the structure is a hollow structure, the bottom diameter of the hollow structure close to the cone is 68.5mm, and the top diameter of the hollow structure away from the cone is 30mm; Step 4, the outer diameter of the conical structure is 96mm, and the angle between the inclined surface of the conical structure and the horizontal plane is 45 degrees; Step 5, drill holes at a position 160mm in diameter from the center point of the basic shape, and drill three threaded holes with a diameter of 19mm. The spacing angle of the three threaded holes is 120 degrees; Step 6, one of the threaded holes is repositioned 60 degrees to drill three auxiliary threaded holes with a diameter of 16mm.

[0006] The beneficial effects of the present invention are:

[0007] The present invention selects special cast iron materials and obtains the required size through fine processing, thereby solving the bad phenomenon that the nozzle flange of the powder metallurgy tundish is prone to adhesion during the production process, avoiding the problem that the cast iron flange is prone to rust during use and needs to be cyclically polished, which leads to the flange becoming thinner and requiring replacement, thereby reducing production costs. Such a design is highly practical and has broad market application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a side view of the overall structure of the present invention;

[0009] Figure 2 It is a cross-sectional view of the overall structure of the present invention;

[0010] Figure 3 It is a top view of the overall structure of the present invention;

[0011] Figure 4 It is a bottom view of the overall structure of the present invention;

[0012] 1- pancake shape, 2- cone shape, 3- basic shape, 4- frustum, 5- inclination angle, 6- cone structure, 7- hollow structure, 8- inclined surface, 9- threaded hole, 10- secondary threaded hole. DETAILED DESCRIPTION

[0013] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0014] The present invention provides a process for manufacturing a nozzle flange of a powder metallurgy tundish of non-stick steel, and the specific processing steps are as follows: step 1, select a cast iron material, first turn it into a round cake shape 1 with a maximum bottom diameter of 200 mm, a conical shape 2 is provided above the round cake shape 1, and the thickness of the overall basic shape 3 is 48 mm; step 2, find the center point of the basic shape 3, turn the bottom surface into a truncated cone shape 4 with an inner hole diameter of 116 mm, the thickness of the truncated cone shape 4 is 4 mm, and the inclination angle 5 of the transition surface between the truncated cone shape 4 and the bottom surface is 45 degrees; step 3, a conical structure 6 is provided at a position away from the bottom surface of the truncated cone shape 4, and the conical structure 6 The interior is a hollow structure 7, the bottom diameter of the hollow structure 7 close to the truncated cone 4 is 68.5mm, and the top diameter of the hollow structure 7 away from the truncated cone 4 is 30mm; Step 4, the outer diameter of the conical structure 6 is 96mm, and the angle between the inclined surface 8 of the conical structure 6 and the horizontal plane is 45 degrees; Step 5, drill a hole at a position 160mm in diameter from the center point of the basic shape 3, and drill three threaded holes 9 with a diameter of 19mm, and the spacing angle of the three threaded holes 9 is 120 degrees; Step 6, one of the threaded holes 9 is positioned 60 degrees to drill three secondary threaded holes 10 with a diameter of 16mm.

[0015] This plan has now been implemented in specific projects, and has been put into production for nearly 90 times in a row without any problems of steel sticking or nozzle blockage. This has greatly improved the powder metallurgy tundish technology and the safety factor during production, and has resulted in improvements in both product quality and economic benefits.

[0016] The beneficial effects of the present invention are:

[0017] The present invention selects special cast iron materials and obtains the required size through fine processing, thereby solving the bad phenomenon that the nozzle flange of the powder metallurgy tundish is prone to adhesion during the production process, avoiding the problem that the cast iron flange is prone to rust during use and needs to be cyclically polished, which leads to the flange becoming thinner and requiring replacement, thereby reducing production costs. Such a design is highly practical and has broad market application prospects.

[0018] The above are only preferred embodiments of the present invention, but do not limit the patent scope of the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments, or replace some of the technical features with equivalent ones. Any equivalent structure made by using the contents of the present invention specification and drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the present invention.

Claims

1. A process for manufacturing a non-stick steel powder metallurgy tundish nozzle flange, characterized in that: Step 1: Select cast iron material and turn it into a round cake shape with a maximum bottom diameter of 200 mm, with a conical shape on the top of the round cake, and the thickness of the overall basic shape is 48 mm; Step 2: Find the center point of the basic shape, and turn the bottom surface into a truncated cone with an inner hole diameter of 116 mm. The thickness of the truncated cone is 4 mm, and the inclination angle of the transition surface between the truncated cone and the bottom surface is 45 degrees. Step 3: A conical structure is provided at a position of the bottom surface away from the truncated cone shape, the conical shape forms the outer contour of the conical structure, the inside of the conical structure is a hollow structure, the bottom diameter of the hollow structure close to the truncated cone shape is 68.5 mm, and the top diameter of the conical structure away from the truncated cone shape is 30 mm; Step 4: The outer diameter of the conical structure is 96 mm, and the angle between the inclined surface of the conical structure and the horizontal plane is 45 degrees; Step 5: Drill three threaded holes with a diameter of 19 mm at a position 160 mm away from the center point of the basic shape, and the spacing angle of the three threaded holes is 120 degrees; Step 6: Reposition one of the threaded holes 60 degrees and drill three secondary threaded holes with a diameter of 16 mm.

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