Machining method for large high-strength stamping part with inner hole

Abstract

The invention relates to a machining method for a large high-strength stamping part with an inner hole. According to the specific method, sample putting and spreading, blank part size determining, blank part cutting, stamping, inner hole cutting, external straight side shearing, external curve side cutting and leveling are sequentially carried out according to the material performance, the plate thickness, the part shape, the size and related technical requirements of the large high-strength stamping part with the inner hole. Thus, the machining method has the following beneficial effects that equipment with the cut fracture surface quality being relatively high is adopted to machine the size of the inner hole and the size of an outer hole of a stamped blank part, and it can be ensured that no pull crack phenomenon or an extremely small number of pull crack phenomena of the part appear during profiling; and by means of the machining manners of manufacturing an explorator for manual cutting and manufacturing a shearing sample plate for shearing a straight side, the cost of manufacturing a large number of dies can be saved, the die manufacturing time and the die testing and repairing time can be saved, the production cost can be greatly reduced, and timeliness of production is guaranteed.

Description

technical field [0001] The invention is suitable for processing methods such as cold pressing, cutting, shearing and leveling of large-scale high-strength medium-thick plate stamped parts with inner holes, and is suitable for processing large-scale high-strength steel plate stamped parts in the railway wagon manufacturing industry. In particular, it relates to a processing method for a large-scale high-strength stamping part with an inner hole. Background technique [0002] With the development of China's railway freight towards high-speed and heavy-duty, the cold-formed parts of large-scale high-strength medium-thick steel plates will be more and more widely used in railway wagons, and its cold-formed processing technology will also increase. more and more mature. [0003] At present, the general processing technology of large-scale high-strength stamping parts with inner holes, such as the lower side plate of C80E gondola parts (as shown in Figure 1), is: die stamping f...

AI Technical Summary

Problems solved by technology

[0005] ⑴ If the sheet metal is directly used for pressing, it is easy to crack at the corner inside the rib of the part after pressing;

[0006] ⑵ Directly use the die to punch out its external dimensions, which cannot be processed due to the large tonnage, plate thickness and strength of the press;

[0007] ⑶ If the outer dimensions of the parts are punched out with a die, at least two sets of large punching dies are required, the die production cycle is long and the production cost is high;

[0008] ⑷ After stamping and forming, such parts have extremely poor mold fit, that is, poor flatness, and use tooling for leveling, and the adjustment amount can only be controlled manually. Not only is the efficiency low, the labor intensity is high, and the flatness is difficult. ensure

[0011] ⑵ Due to the large punching size and the tonnage limitation of the press, it is impossible to directly punch out the outer dimensions of the parts;

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