SU110871A1 - Method of making a drill - Google Patents

Description

There are known methods for producing spiral drills with spiral channels in their pens, which serve to feed cooling and lubricating substances into the cutting zone under pressure, using rolling and curling the working part of the drill blank.

The known designs of drills increase the durability and strength of the drills, but they are not widely used in industry, as the constructions, in a number of cases, do not provide operational reliability, and their manufacture presents great technological difficulties.

The described method of making drills is a further improvement of the manufacturing process of their manufacture, which is carried out as follows.

Holes of large diameter and smaller length than calculated are drilled in the workpiece. This is done in order to obtain deep holes along the entire length of the working part of the drill during the plastic deformation process. After rolling the working part of the drill frizz. To prevent overlapping / flattening / cross-section of the channels during rolling and curling, the channels of the working and tail parts of the workpiece of the drill before heating are filled with a substance that has a melting point above the heating temperature of the workpiece, then this substance is removed from the channels after rolling and curling. To bring the axes of drilled holes closer to the periphery of the drill and its cutting, we pin to the edges, and also to strengthen the core of the drill, the workpiece is set into rolling streams of forging rollers with a preliminary angular displacement of the planes of the axes of the channels relative to the vertical plane passing through the axis of the workpiece.

FIG. 1 shows a twist drill with channels; FIG. 2 - view of the drill from the side of the cutting edges; in fig. 3 - the same in cross section.

A twist drill consists of a working part 1 and a tail part 2, which are made as a single runner or are joined together by welding.

To obtain a given length of the working part of the finished drill, the blank of this part is equal to half its normal length. In the process of forming the profile of the workpiece, it lengthens to a predetermined value.

In the tail section of the round billet, one axial channel 3 of larger diameter is drilled, and in the working section, equal distance from the axis of two channels inclined to the axis, channels 4 of smaller diameter, converging / butting, connecting / with the tail channel. To obtain deep holes for the entire length of the working part of the drill, from the side of the cutting teeth of the billet, make holes with a larger diameter and smaller length than the calculated one, which, when rolled during plastic deformation, change the cross-sectional shape and are located along the entire profile part of the drill billet.

The channels, in the order of preparation for plastic deformation, to ensure the preservation of the cross section profile and prevent them from closing, are filled with a substance having a melting point above the heating temperature of the billet for rolling and retaining its composition and chemical properties at high pressure.

The channels filled with the warning substance are closed by screw plugs, brewing or other methods. The work piece is heated for plastic deformation and rolled in parallel strands of sector forging rollers.

The profile of the holes in the channels and their location in the pens can be modified by changing the angle of the task of the workpiece in the forging rollers. In particular, to strengthen the core of the drill by some thickening or to bring the cooling channel sections to the cutting edges of the drill, the axis of drilling of the channels is shifted to the periphery of the workpiece, and the task of preparing the rolling brooks is produced with an angular displacement of the vertical axis of the centers of the drilled holes around the longitudinal axis of the workpiece.

Rolling is carried out up to the estimated length of the profile of the drill and the cross-section of the holes, after which the profiled working part is curled. Then the curled drill bit will be placed in a bath of solvent, which will react chemically with the substance filling the channels; at the same time, the reaction product either dissolves or is released as a gas into the environment, freeing the channels and channels from the substance that fills them. Further, the workpiece is subjected to finishing operations.

Such drills solve the problem of high-speed drilling of steel, cast iron and other materials, and reduce the consumption of expensive and scarce high-speed steel.

Subject invention

Claims (3)

1. A method of making drills with spiral channels in their pens for lubricating and cooling substances using rolling and curling the working part of the drill billet, which in order to reduce the processing capacity and simplify the manufacturing process, holes are drilled in the billet a larger diameter and a smaller length than calculated, so that during rolling during plastic deformation to get deep holes for the entire length of the working part of the drill, after which it is curled. 2. Acceptance of the method according to claim 1, differing from that with the aim that, in order to prevent overlapping / flattening / cross-section of the channels during rolling and curling, the drilled holes before heating for rolling should be filled with a substance with a melting point above the heating temperature. blanks for rolling and removed after rolling and curling, 3. Acceptance of the method of PP. 1 and 2, characterized in that, in order to approach the axes of the drilled holes to the periphery of the drill and its cutting edges, as well as to strengthen the core of the drill, the workpiece is set into rolling streams, forging rollers with a preliminary angular displacement of the plane of the axes of the drilled holes with respect to the vertical plane passing through the axis of the workpiece.