A cross-expansion method

Abstract

The invention discloses a crossed pore expanding method. The crossed pore expanding method comprises the following steps: (1) according to the materials and specifications of blanks for pore expansion, calculating the pore expansion force and expansion coefficient; (2) selecting a mold series needed for pore expansion and the diameter of a matching pore expansion needle, wherein a mold consists of an upper half part and a lower half part, the upper half part consists of a substrate, a pore expansion needle extension rod, a pore expansion beam, a pore expansion needle, a pore expansion rod and a upsetting pad, the lower half part consists of a pore expansion tube, a pore expansion punch, a blank position and a shearing ring; and (3) starting pore expansion, starting from small series, entirely changing the lower half part of the mold after a series of blank production is completed, and deciding whether the upsetting pad of the upper half part is changed according to the requirements of technology, correspondingly changing the upsetting pad when the expansion coefficient of the next series of blank is more than or equal to 1.30 or the pore expansion force is more than or equal to 10MN, and so on, all blanks are produced. The mold changing work can be simplified, the working efficiency can be improved, and meanwhile, the service life of the mold can also be prolonged.

Description

technical field [0001] The invention relates to a hole-enlarging method of an extruded pipe, in particular to a cross-hole-expanding method. Background technique [0002] With the rapid development of steel pipe extrusion technology, there are more and more hole reaming specifications of the billet. Therefore, the mold series and specifications of the hole reaming machine are also more and more detailed. The accuracy of the mold of the reaming machine is mainly reflected in the close cooperation of each series of reaming extension rods and reaming rods, upsetting pads and reaming pins, upsetting pads and reaming cylinders, reaming cylinders and reaming rods Above, the part of the reaming cylinder mainly involves the tight fit of the pressure ring, the fit of the reaming pin and the reaming head, and the fit of the reaming pin and the blank. [0003] With the continuous change of reaming process requirements and the increase of reaming specifications, more and more molds nee...

AI Technical Summary

Problems solved by technology

It is very troublesome to replace a whole set of molds, which not only wastes a lot of time and affects production efficiency, but also causes the accumulation of molds due to the diversity of mold specifications, wasting money

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