Front cap spinning forming device and technology for blast-furnace tuyere small sleeve

Abstract

The invention relates to a front cap spinning forming device and technology for a blast-furnace tuyere small sleeve. The front cap spinning forming device comprises a machine frame, wherein the machine frame is of a cross-shaped structure, and the machine frame comprises a base and two side seats; a first guide rail and a second guide rail are arranged on the base, and the first guide rail and thesecond guide rail are both arranged in the transverse direction. The forming technology comprises the following steps that step1, a copper cake blank is prepared; step 2, the copper cake blank is heated; step 3, the copper cake blank is placed; and step 4, the copper cake blank is subjected to strong spinning. According to the front cap spinning forming technology for the blast-furnace tuyere small sleeve, compared with a front cap stamping forming technology, the materials are saved, secondary processing is not needed, the precision can be controlled, the heat conduction of a strong spinningfront cap in a deep-cylinder shape is 30% higher than the heat conduction of a stamping front cap in a short-cylinder shape.

Description

technical field [0001] The invention relates to a front cap spinning forming equipment for a small sleeve of a blast furnace tuyere and a process thereof, belonging to the technical field of blast furnace smelting equipment. Background technique [0002] The blast furnace tuyere cover that is used at present is all made of metal copper, and the blast furnace tuyere cover is at the furnace hearth position. The hot air with a temperature of 1100℃~1200℃ is sprayed into the blast furnace from the small tuyere sleeve. The small tuyere sleeve is easily melted by the hot air and corroded by the dripping slag and iron, resulting in a short service life. If it is not handled in time, it may easily cause safety or production. The accident caused great inconvenience to the production of the blast furnace. [0003] At present, the molding process of the front cap used in the blast furnace tuyere small sleeve is to use copper rods to extrude on a heavy-duty press. The front cap produced...

AI Technical Summary

Problems solved by technology

[0004] 1. There will be small slag inclusions, interlayers, and cracks that are not easy to find at the front end. These small defects are extremely difficult to detect during stamping, welding, and pressure testing. Small cracks occur at the front end of the sleeve, which reduces the heat radiation resistance of the tuyeres and causes the tuyeres to be scrapped quickly;

[0005] 2. The length of the extruded part cannot exceed 380mm. Due to the limitation of stamping processing itself, the extensibility of the material has a certain limit, and deep barrel-shaped products cannot be processed;

[0006] 3. During the drafting process, the punch will scratch the inner wall of the front cap, resulting in a certain depth of pull marks, which are too many and inevitable, and affect the tensile strength of the front cap;

[0007] 4. Because the length of the extruded front cap is limited, the space of the water cavity at the back of the tuyere cover is huge, and the huge water cavity will generate too much dead water area, which will also reduce the water outlet speed, resulting in an increase in the resistance of the water head and affecting heat dissipation;

[0008] 5. The larger the rear water cavity, the more gas will remain in the rear cavity. The tuyere is made of pure copper, and pure copper conducts heat quickly. Whether it is the front end or the rear end of the tuyere, any factor that affects heat conduction will affect the tuyere. The overall heat dissipation effect, over time, will reduce the crystal structure and fatigue strength of materials and welds

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