Manufacturing method for needle tube pen point and dotting mechanism

Abstract

The invention discloses a manufacturing method for a needle tube pen point and a dotting mechanism. The manufacturing method comprises the following steps of (1) extruding a needle tube to form a pen point portion; (2) drilling a hole in the pen point portion along the axial direction; (3) performing dotting on the pen point portion along the radial direction; (4) trimming projections; (5) precisely trimming an opening of the pen point portion; and (6) mounting a steel ball and clamping the steel ball. In the manufacturing method, dotting is carried out along the radial direction by the dotting mechanism so that the projections are obtained, and the pen point is tapered. Compared with a method of forming a tapered pen point in a cutting manner, the manufacturing method has the advantages that the time is saved during dotting, so that the production efficiency is improved. The dotting mechanism comprises a wedge and a mandrel, wherein the mandrel is used for supporting and positioning the needle tube; the wedge is provided with an inclined plane; and the inclined plane of the wedge is matched with an inclined plane of the needle tube. When the wedge moves along the axial direction of the mandrel, the inclined plane of the wedge squeezes an inclined plane of an inclined plane body, so that the inclined plane body drives an ejector pin to move along the radial direction of the mandrel; the dotting accuracy is improved; and the production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of a needle pen tip, in particular to a manufacturing method and a dotting mechanism of a needle tube pen tip. Background technique [0002] A ballpoint pen, or ballpoint pen, is a pen that uses a tiny rotating ball made of brass, steel, or tungsten carbide to release ink onto the paper as you write. The refill of the ballpoint pen is usually a needle tube type, which is the core component of the ballpoint pen. In the prior art, the production of the refill of the ballpoint pen usually includes drilling, cutting of the nib, and the like. Nib cutting generally relies on a cutter to cut the nib of the pen core to form a certain taper. On the one hand, this method requires frequent replacement of the tool due to the wear and tear of the tool. On the other hand, the cutting operation itself is time-consuming, thereby reducing the production efficiency of the entire pen core. Contents of the invention [000...

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