Method for extruding inner transverse rib of cylindrical piece

Abstract

The invention provides a method for extruding an inner transverse rib of a cylindrical piece. Themethod comprises the following steps: (1) extruding a blank downwards by a left male die and a right male die; (2) moving the left male die and the right male die to the left and the right respectively to press working zones at the head parts of theleft male die and the right male die into a cylinder wall; (3) rotating a female die, and keeping the left male die and the right male die moving to the left and the right; (4) stopping the horizontal separation motion of the left male die and the right male die, extruding the blank again by the left male die and the right male die, and simultaneously keeping the female die rotating to form a cylinder wall with slant fiber texture; (5) stopping the female die from rotating, and combining the left male die and the right male die; (6) after combining the left male die and the right male die, integrally moving the left male die and the right male die downwards to extrude the blank; (7) separating the left male die and the right male die, and rotating the female die; (8) after finishing extrusion and rotation, drawing the left male die and the right male die close to each other; and (9) moving the left male die and the right male die upwards, and pushing an extruded piece out by an ejector rod so as to finish a complete extrusion and rotation process. Accordingto the method, the fiber texture of a cylinder body is distributed spirally and is slant,and the transverse and longitudinal comprehensive performance of the extruded piece is improved.

Description

technical field [0001] The invention belongs to the metal extrusion forming industry, in particular to an extrusion forming extrusion method for inner transverse ribs of cylindrical metal parts. Background technique [0002] For the extrusion of cylindrical parts, the traditional reverse extrusion method can only produce straight-walled cylinders. For the shape of the cylinder wall with inner ring ribs, it cannot be directly extruded, but the method of extrusion thickening the cylinder wall is used. The thick-walled cylinder is extruded, and the excess material is cut off by machining to become high ribs, which leads to a large waste of material and many processes. [0003] Such as figure 1 As shown, use punch 21, die 22 to extrude thickened cylindrical part 1, as figure 2 As shown, the excess wall thicknesses 12 and 13 of the upper and lower parts of the thickened cylinder wall 11 are subsequently cut off by machining, and the remaining middle wall thickness forms the in...

AI Technical Summary

Problems solved by technology

[0004] Various studies have shown that the axial performance of the traditional reverse extrusion straight wall is higher than the lateral performance, and there is anisotropy. For cylindrical parts such as hubs, large bearings, gun barrels, etc. In the direct extrusion method, the direction of the deformed fiber of the tube wall is the same as the axial direction, such as image 3 As shown, the fiber direction 15 of the cylindrical member 16 is the same as the axis of the inner cavity. The traditional extrusion method cannot extrude inner ribs, grooves and oblique fiber structures, and cannot meet the needs of ultra-long-distance continuous load work and long-term continuous The performance requirements of work, high temperature and high frequency stress. Therefore, at present, the difficulty that needs to be solved urgently in reverse extrusion is to squeeze and tilt the direction of the deformed fiber of the cylinder wall to form a continuous spiral shape, such as Figure 4 As marked, the fiber direction 18 of the cylindrical member 17 is in a continuous spiral shape centered on the axis of the lumen

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