SU904915A1 - Trepanning drill - Google Patents

Description

(54) RING DRILL

one

The invention relates to the processing of metals by cutting and can be used to obtain through holes with ring drills.

Known annular drill bit, containing a housing having the form of a hollow cylinder, on the end part of which the cutting elements are fixed. When machining the through holes with such drills, core 1 remains in their casing after the passage.

A disadvantage of the known construction is that when removing the core, the integrity of the edges of the cutting elements is disturbed due to their chipping.

The aim of the invention is to provide a free exit from the drill body of the remaining core.

This goal is achieved by the fact that the annular drill is equipped with retainers installed in the housing grooves and designed to interact with the cutting elements, and in the housing there are holes for additional spring drills in contact with the pin.

FIG. 1 shows the proposed circular drill in the non-working position, a general view; in fig. 2 shows a section BB in FIG. one;

in fig. 3 shows a section BB in FIG. one; Fig. 4 shows a diagram of the position of the cutting elements during operation of the drill; on fiig. 5 is a diagram of the position of the cutting elements when the core leaves the drill body.

The annular drill consists of a body 1 with a tapered shank of the cutting elements 2 installed in the body 1 with the possibility of free rotation on the pins 3, placed in the slots 4 of the body and spring-loaded with the help of springs 5, as well as clamps 6.

The tool works as follows.

When not in use, i.e. Before bringing the drill to the workpiece 7, 15, there is a gap D between its cutting elements 2 and clamps 6, which is ensured by the fact that the pins 3, on which the cutting elements 2 are mounted, are pressed by the springs 5 to the bottom of the grooves 4. When the ring drill goes to the workpiece 7 and in contact with it, the cutting elements 2 together with the pins 3 begin to move relative to the body 1 of the drill until the gap D disappears and the cutting elements 2 with their po3

The surfaces will not interact with the identical in shape surfaces of the latches 6. When the cutting elements 2 stop against the latches 6, further movement of the tool with a working feed is accompanied by a hole processing.

At the end of processing, i.e. When drilling the billet to the full depth and the output of the cutting elements 2 from the workpiece 7, they again, under the action of the springs 5, move away from the fixings 6 (a gap A appears between the cutting elements 2 and the fixings 6).

At this time, the pins 3 move along the grooves 4 until they stop at their bottom. At the same time, the core 8, under the influence of its gravity, tends to go down and, acting on the cutting elements 2, rotates them on the pins 3 (within the limits allowed by aaj), which ensures the free exit of the core 8 from the drill body 1 even if it is skewed .

Thus, by providing a free exit of the core, it is possible to reduce the auxiliary time to two times.

when machining through holes. In addition, damage to the cutting edges is prevented and, accordingly, tool life is increased.

Claims (2)

Invention Formula An annular drill, in the grooves of the housing of which cutting elements are mounted on pins, characterized in that, in order to ensure a free exit from the drill core of the remaining core, the circular drill is provided with retainers installed in the grooves of the housing and designed to interact with the cutting elements, and in the housing are made holes for additional springs inserted into the drill bit that are in contact with the pin. Sources of information taken into account in the examination 1. Device and tools for machine work. Lenizdat, 1976, p. 35, rice 28 A-U1 6I uchKHI fe.2 2.J TH / 2.