Method for machining forming hole of annular feed forming mould and reamer

Abstract

The invention discloses a method for machining a forming hole of an annular feed forming mould and a reamer. The method comprises the steps that a center hole is drilled at the center of an inner-wall forming hole of an annular mould body through a center drill firstly; secondly, the forming hole is drilled roughly in the position of the center hole from the inner wall of the annular mould body to the outer wall of the annular mould body through a twist drill; thirdly, the hole is reamed through the forming hole reamer, chamfering is conducted on a hole opening, burrs of the hole opening are removed, and the machined forming hole is smooth, clean and standard. According to the forming hole reamer, a conical-surface counter bit (12) is additionally arranged between a drill bit (11) and a drill handle (13), after the forming hole is reamed, chamfering and burr removal can be conducted on the hole opening without the need for cutter replacement, and therefore machining efficiency is improved.

Description

technical field [0001] The invention relates to a method for processing a forming hole of a feed forming ring die, and also relates to a forming hole reaming drill used for processing the forming hole. Background technique [0002] Feed forming ring die is a ring die used for feed forming, including a ring die body and multiple forming holes set on the ring die body. When in use, the pressure roller rotates in the inner cavity of the ring die to extrude the feed, and the feed is extruded through the forming holes. out, and then cut into feed pellets of a certain length by a cutter installed outside the ring die. [0003] The processing of the existing forming holes is to punch holes from the outer wall of the annular mold to the inner wall of the annular mold. Since the inner wall of the annular mold is an annular surface, the hole is divided into two halves after the forming hole is drilled, and the drill bit cannot be cut. The orifice is squeezed open, causing the orifice...

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Problems solved by technology

[0003] The processing of the existing forming holes is to punch holes from the outer wall of the annular mold to the inner wall of the annular mold. Since the inner wall of the annular mold is an annular surface, the hole is divided into two halves after the forming hole is drilled, and the drill bit cannot be cut. The orifice is squeezed open, causing the orifice to be rough and irregular in shape, and the burrs on the orifice are also difficult to remove, which increases the resistance of the feed forming and affects the appearance of the feed

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