How soft and manageable fire “snakes” rolled in the hands of the rollers, they are so stubborn and hard to handle in the cold when cutting them on the measuring of the workpiece. Cutting methods — sawing with diamond discs, gas or plasma cutting or not give a smooth, does not require additional processing of the edge of the workpiece, or entail a significant waste of metal.
That is why great interest was aroused pulse set-breaking cold rolled, shown recently at ENEA USSR. And showed her in the pavilion “education”. The fact that she designed in Kommunarsk mining and metallurgical Institute. La-Torah cleverly used technological method… used by glaziers in cutting glass.
Because steklorezy tool does not actually cuts, but only “scratches holes” the surface, disrupting its integrity. Then, using the physico-mechanical properties of the material, enough to make even a little effort — usually the cost of tapping along the notch and the glass is breaking exactly at the scheduled diamond line.
Experiments conducted by staff and students of the Institute showed that the same principle can be cut and rolled. Only the load must be accompanied by a “momentary”: it is known that even such a plastic material, such as resin or var, is broken and chipped when a sharp impact loads.
As the power of the Executive body and decided to use the cylinder-piston group — the explosion of the combustible mixture in the cylinder provides the necessary instantaneous load on the working tool, resembling in action the work of scissors.
The system consists of a line consisting of consecutive conveyor with stepper feed rod, the mechanism causing a cut and vertically positioned power unit (see Fig.).
Pulse break-up is applicable for cutting of round and square products, as well as thick-walled tubes with a maximum cross section of 250 mm Minimum length of the resulting workpieces may be less than the diameter of the rod or tube.
The explosion shears offer high performance — up to 6 lugs per minute — a good level of quality and give a smooth, indicate instead end faces, does not require additional processing.
Actuator installation — cylinder-piston group to the receiver — ensures the concentration of gases of high pressure and subsequent transfer of energy in a pulsed mode to the working tool. Depending on the section of the hire as an energy carrier can be used compressed air or combustible gas mixture, e.g. natural gas with air.
The Institute has created several types of pulse settings, the dimensions of which in terms 1000Х15000 mm, height 3200 mm. high performance, design simplicity, small dimensions and waste-free cutting of rolled provide a considerable economic effect, particularly for series and mass production of blanks.