Shank structure for cutter clamping

Abstract

The invention discloses a shank structure for cutter clamping. The shank structure comprises a shank body (3), a cylinder clamp (2) and a screw cap (1), wherein tapers of an outer taper section (2.3) of the cylinder clamp (2) and an inner taper section (3.4) of the shank body (3) are both 3 degrees; a straight positioning section (2.5) is arranged at the tail section of the cylinder clamp (2); a straight transition section (2.4) is arranged between the positioning section (2.5) and the outer taper section (2.3); a diameter of the straight transition section (2.4) is smaller than a diameter of the positioning section (2.5); a closing end of a spit groove (2.6) is positioned on the transition section (2.4); a positioning surface (3.5) fitting the positioning section (2.5) is arranged in a shaft hole of the shank body (3); and the outer peripheral surface of the positioning section (2.5) is bonded with the positioning surface (3.5). The cylinder clamp of the shank structure for cutter clamping is positioned by three surfaces, so that the positioning effect is good; the precision is high; the clamping force is strong; the pull is easy; and the use cost is low.

Description

technical field [0001] The invention relates to the technical field of tool assembly, in particular to a tool handle structure for tool clamping. Background technique [0002] On lathes and milling machines, when clamping tools, the tool handle structure is used for auxiliary clamping. The current knife handle structure includes a knife handle body, a collet, and a nut. The knife rod of the tool is inserted into the collet, and the collet is clamped in the handle. The nut is threadedly connected to the handle. The collet is advanced so that the collet is forced to shrink in diameter, clamping the shank of the tool. The front end of the collet in the prior art is provided with an inclined surface for matching with the inner inclined wall of the nut and an annular groove for engaging with the snap ring provided in the inner cavity of the nut, and the collet is provided with an outer cone The front part of the handle is provided with a connecting part for matching with the nu...

AI Technical Summary

Problems solved by technology

But the problem is that the collet and the handle of the prior art are generally only positioned by the slope of the front end of the collet and the outer cone section of the collet, and the outer cone section usually adopts a larger taper. Both the clamping force and the stability of the clamping are insufficient

And after long-term use, it is inevitable that there will be a certain deviation in the thread fit before the connection between the nut and the handle, and the force between the collet and the handle will be uneven. The outer cone section of the collet and the inner cone of the handle The fitting surfaces between segments are prone to slight scratches or abrasions, which will not only greatly affect the clamping force and centering accuracy between the tool handle and the collet, but also cause some fitting surfaces to be tightly assembled, making it difficult for the collet to When pulling out from the holder shaft hole

But the problem is that the collet of the prior art has too high requirements on the precision of the taper surface, and it is difficult to process it by simple sandpaper grinding. Therefore, the structure of the tool handle of the prior art has a short service life, needs to be replaced frequently, and has a high cost of use.

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