Method for attachment of rock destroying inserts of drilling tools and working elements of sinking machines

FIELD: mining.

SUBSTANCE: method for attachment of rock destroying inserts in working element of drilling tools and sinking machines involves inserts location in bushes made of flexible material that are pressed-in into working element of drilling tool and sinking machines, note that there are longitudinal channels on bushes external surface for air supply and distribution of stresses during pressing-in.

EFFECT: increase of error-free running time of working elements.

 

Mountain ranges containing rock fortress more than 5 on a scale of Professor Rzhevsky VV [1], are broken by drilling and blasting operations.

The drilling of boreholes and drilling openings produced by the drilling tool (working body), Portorosa parts which are reinforced with inserts of hard metal, industrial diamonds, etc.) [2].

Mounting inserts in the drilling tool is made by soldering or press-fit (interference fit).

The aforementioned attachment methods have some significant drawbacks.

So when soldering inserts, the latter is heated to the melting temperature of the solder, which has a negative effect on the properties of hard alloys.

Mount inserts by pressing leads to the fact that in solid alloys are formed residual compressive stress, which are added to the working voltage, taking place at the destruction (by cutting the chip or the strike of the rocks.

Impact summing voltages for inserting the leads to premature breakage of the latter.

The aim of the invention is to provide a method of mounting inserts in the working bodies of the drilling tool and the working bodies of heading machines.

This goal is achieved by the fact that Portorosa inserts are placed in the sleeve, made of ductile metal, for example copper.

On the outer surface the sleeves are made of grooves, for example, in the form of a triangle. The grooves may be parallel to the imaginary axis of the sleeves or along a helical line.

The pressing inserts in plastic sleeve reduces tension and compression increases the actual contact surface.

In addition, when exposed rocks on insert, formed by bending stresses, i.e. compression and tension. Under the action of these stresses, the plastic inserts are deformed, thereby decreasing the total stress acting on the insert.

Cutting grooves on the outer surface of the bushing has two purposes. First, when the pressing inserts creates a piston effect, which increases the pressing force. The grooves compressed air escapes and the compression does not occur.

Secondly, the presence of grooves on the outer surface of the sleeves allows the bushings when they are pressing to deform, which increases the actual surface contact with them as with inserts, and the material of the working body.

The proposed method of mounting inserts drilling tool and working bodies sinking machinery increases the MTBF their working bodies.

Literature

1. Rzhevsky CENTURIES Processes of surface mining.

2. Kogan B. I. Technological quality assurance production of mining machines and tools.

Mounting method species the destructive inserts in the working body of the drilling tool and sinking machinery, characterized in that the inserts are placed in the sleeves, made of ductile metal, which is pressed into the working body of the drilling tool and sinking machinery, and on the outer surface of the sleeves are made of longitudinal grooves.



 

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