Machining method for large-sized inner-hexagon blind hole

Abstract

The invention discloses a machining method for a large-sized inner-hexagon blind hole. The machining method comprises following steps: step 1, drilling a bottom hole and heating; step 2, punching; step 3, separating a workpiece from an inner-hexagon punch. In the step 2, an opened backing plate is connected between two first equal-height cushion blocks on a workbench of a press machine in an overlapping mode; the lower end of the workpiece is located between the two first equal-height cushion blocks and the upper end of the workpiece is arranged at the upper end of an opening in an overlapping mode; the punch is aligned at the bottom hole of the workpiece; the press machine is operated such that a pressure head downwardly punches the punch a punch bottom disc; and the punch is punched in the bottom hole of the workpiece for finishing punching operation. In the step 3, two second equal-height cushion blocks are relocated on the workbench of the press machine; the punch bottom disc is in overlap joint with an upper edge of the two second equal-height cushion blocks; the workpiece is located between the two second equal-height cushion blocks; an opened pressing plate is placed on an upper end surface of the workpiece; an open groove of the opened pressing plate donwardly rides onto the punch bottom disc; the press machine is operated such that the pressure head downwardly punches the opened pressing plate; and the punch is taken out of the inner-hexagon blind hole. The machining method for the large-sized inner-hexagon blind hole is advantaged by being convenient in operation, high in working efficiency and stable in product quality.

Description

technical field [0001] The invention belongs to the technical field of mechanical equipment manufacturing, and relates to a processing method for a large-size inner hexagonal blind hole. Background technique [0002] In mechanical equipment, it is often encountered some small batches of parts with hexagonal blind holes, such as bolts, etc. These hexagonal blind holes are usually used for the rotation and fastening of hexagonal wrenches, and the dimensional accuracy is not high. For the circumscribed circle diameter For the processing of small-sized and small-batch internal hexagonal blind holes less than 25MM, the bottom hole is usually drilled first, and then the bottom hole is heated with an oxyacetylene flame to red heat, and then punched out with a hammer hammering the internal hexagonal punch. The disadvantage is that it is not easy to take out the punch after it is punched in; and for the inner hexagonal blind hole with a circumscribed circle diameter greater than 25MM...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a processing method for large-size internal hexagonal blind holes, which solves the

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