Blank inner rib overturning die for cylinder workpiece with transverse inner ribs

Abstract

The invention relates to a blank inner rib overturning die for a cylinder workpiece with transverse inner ribs. The blank inner rib overturning die comprises a male die, a female die and a lower ejector rod. The blank inner rib overturning die is characterized in that the male die comprises a male die correcting ring, a male die pressing plate, a connecting rod mechanism, a spring, a pressing rod, a limiting pipe and a pressing ring; the male die pressing plate is fixedly connected to the lower end of the pressing rod, the male die correcting ring is arranged on the pressing rod in a sleeving manner, and the connecting rod mechanism is connected with the male die correcting ring and the male die pressing plate; the spring is arranged in the limiting pipe, and the spring and the limiting pipe are arranged on the pressing rod between the male die pressing plate and the male die correcting ring together in a sleeving manner, and are fixed on the male die pressing plate through the pressing ring; the female die comprises an inner overturning female die body, an inner overturning female die body supporting ring and a lower die plate; and the overturning female die is connected to the inner overturning female die supporting ring, and the inner overturning female die supporting ring is fixed to the lower die plate. According to the blank inner rib overturning die, the problem of difficult demolding due to extrusion of the large-and-small-opening cylinder workpiece are solved, the shearing stress during overturning is reduced, material breakage during overturning is prevented, and the extrusion quality of the outer surface of a cylinder is improved.

Description

technical field [0001] The invention belongs to an extrusion method for forming metal material parts, in particular to an overturned blank inner rib mold with a transverse blank inner rib cylindrical workpiece. Background technique [0002] At present, for cylindrical workpieces with transverse internal ribs at the ends, such as certain types of large pressure vessels (see figure 1 ) manufacturing, the structural characteristics of the workpiece: ①The cylinder is thin-walled (10mm), and the end is thick-walled (width 100, thick 100), the overall thickness is different, and it cannot be stretched and formed by sheet metal; ②Extrusion method can only Forming a thick-walled cylinder with the same inner diameter (110) as the end portion results in a large waste of material. [0003] like figure 1 As shown, for the cylindrical workpiece 1 with transverse internal ribs, the traditional forming process mostly adopts the machining method after extrusion, casting method, and weldin...

AI Technical Summary

Problems solved by technology

The material utilization rate of this method is less than 20%, and the performance of machined parts is low, which cannot meet the high strength requirements of pressure vessels

[0004] 1. Traditional casting is used for forming. There are many defects in castings, such as pores, trachoma, etc., which lead to low yield due to porosity, coarse grains, and low mechanical properties, which make it difficult to meet high mechanical property requirements.

[0005] 2. Firstly, the stamping method is used to process the workpiece in sections. The horizontal rib part 1-1 is extruded and then machined. The straight wall part of the cylinder workpiece is formed by thin plate stretching, and then the straight wall part is welded to the horizontal rib. There are many processes and the weld strength is low, so it is difficult to meet the requirements of high mechanical properties of large pressure vessels

[0006] 3. Extrusion is used to form the cylindrical workpiece first, and the bar is subjected to pier roughening, and then back-extruded into a cylindrical part with a wall thickness of 110, and then mechanically processed; the wall thickness of the extrusion cylinder is large, the machining allowance is large, and the machine High cost, time-consuming and labor-intensive, low utilization rate of materials

[0007] In short, for the manufacture of cylindrical workpieces with transverse internal ribs at the end, there are problems of material utilization, low strength of ring ribs, long machining period and high cost in traditional technology.

The key is to extrude the barrel-shaped parts with large mouths, and there is no mold that is easy to demould

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