CS196176B1 - Method of production of the core bursters for the core barrels for sampling the earth - Google Patents

Description

BACKGROUND OF THE INVENTION The present invention relates to a method for producing a core breaker for cores for excavating soil during excavation of a well.

The core breakers of the core breakers, especially for hard rocks, have so far been produced by machining from solid bar material or thick-walled tubes, the conical internal grooves being formed in the core breaker one by one by cutting.

The disadvantages of this method of producing core breakers are, on the one hand, the considerable waste of material, which, while using a thick-walled tube, decreases somewhat and, in particular, the low production productivity resulting from the relatively difficult preparation of the core breaker blank.

The above-mentioned disadvantages of the known method of manufacturing a core shredder are eliminated by the method according to the invention, which consists in separating a cylindrical annulus blank from the tube, tapering into a truncated cone and then forming a longitudinal inner groove in the tapered blank. whereupon the tapered blank is expanded back to the shape of a cylindrical annulus, wherein the longitudinal internal grooves are rearranged into a conical configuration and then the expanded blank is surface and heat treated.

Said method of manufacture provides the prerequisites for further simplification of production, in which the tapering and widening operation is eliminated, the simplification of production being that the internal grooves in the conical configuration are formed in the cylindrical annulus blank by the prevailing radial pressure of the indentation mandrel.

Particularly advantageous for increasing the productivity of production in the preparation of the blank appears to be that the blank is separated from the pipe by a waste-free separation.

The method of manufacturing a core ripper according to the invention is to be found in the following description, which does not naturally exhaust all other options for the selection and combination of forming and chip operations, and in the drawing where FIG.

FIG. 2 shows a tapered blank with a frustoconical shape, FIG. 3 a tapered blank with longitudinal internal grooves formed by a broach, FIG. 4 a blank extended back to the shape of a cylindrical circular with internal grooves rearranged into a conical arrangement.

The cylindrical annulus blank 11 is obtained by the non-waste cutting of the tube 2, for example by shearing / fig. 1 / or chip cutting.

In the following operation, the blank 1 tapers into a truncated cone shape 3 / FIG. 2 /. The blank is tapered in a forming tool (not shown). When the blank 1 is tapered to a truncated cone 3, its wall thickness does not change.

In a truncated conical blank 3, in the following operation (FIG. 3 / forms longitudinal internal grooves 4. The longitudinal inner grooves 4 are all formed by simultaneous machining, for example, not shown by a mandrel, the bottom of all longitudinal inner grooves 4 being parallel to each other and parallel to the longitudinal axis of the tapered blank (not shown).

The wall thickness of the truncated cone 4 is weakened at the points of the longitudinal inner grooves 4, the wall thinning being greatest at the small diameter of the truncated cone 3.

The production of the longitudinal inner grooves 4 is followed by the operation of expanding the truncated cone 3 back into the shape of a cylindrical annulus, which dimensionally corresponds to the cylindrical annulus obtained from the tube 2. As the truncated cone 8 extends back to its original shape, the longitudinal inner grooves 4 rearrange into a conical configuration, the depth of the inner grooves 6 not changing. The widening of the truncated cone 3 is carried out e.g.

Claims (3)

SUBJECT V Method for producing a core rake for soil removal cores, characterized in that a cylindrical annulus blank is separated from the tube, which is tapered to a truncated cone and then formed in the tapered blank by a longitudinal internal groove through a mandrel, and then the tapered blank it extends back into the shape of a cylindrical annulus, wherein the longitudinal internal grooves are rearranged, into a conical configuration and then with an enlarged mandrel extension mandrel in a closed forming tool. The workpiece 6 thus treated is then subjected to known finishing operations in which its outer surface, for example in the form of a truncated cone, is heat treated and cut longitudinally at least once. The core ripper can be formed from a cylindrical annulus blank 1 without operations by tapering with the aid of an indented grooved mandrel (not shown) which in said blank 5 forms an internal groove under the prevailing radial pressure. The pressed-in inner grooves 6 are conical. Thereafter, the workpiece 1 thus treated is treated by said finishing operations. The semi-finished product is surface and heat treated. Method according to claim 1, characterized in that the internal grooves in the conical configuration are formed in the blank by the prevailing radial pressure of the indented grooved mandrel. Method according to Claims 1 and 2, characterized in that the semifinished product is separated from the pipe by a waste-free separation. 1 sheet of drawings Srveroprafí · ' ^η · P- 7. Moet