SU931302A1 - Method and apparatus for plasma machining - Google Patents

Description

(54) METHOD OF PLASMA-MECHANICAL PROCESSING AND DEVICE FOR ITS IMPLEMENTATION

one

The invention relates to a plasma-mechanical treatment, and is intended primarily for the machining of chamfers and creams of sheet blanks of intractable materials.

There is a method of processing the edges and chamfers of sheet blanks with a plasma jet G1.

Such a method, despite its high performance, does not in many cases provide the required surface quality both in the height of irregularities and in the depth of a defective, thermally and chemically modified layer.

The known method and device for milling difficult-to-cut materials with a preheated shear layer by a plasma jet 2.

This method, providing a high quality of the treated surface, does not provide high performance when removing large allowances, since it is associated with the transformation into chips because of the large energy costs for heating the metal to be removed.

The purpose of the invention is to increase productivity when machining edges and chamfers of sheet blanks of hard-to-machine materials and improving the quality of the machined surface.

The goal is achieved by the fact that in the method of plasma-mechanical processing the plasma jet moving relative to the workpiece together with the tool, is used in the cutting mode, cutting part of

Give it an allowance, which is then from; they die with a special knife, and the rest & 15 shuys, part of the allowance heated in the process of cutting to the softening temperature is removed with a mechanical cutting tool.

In addition, in a device for carrying out a method comprising a plasma torch and a cutting tool, between the plasma torch and the mechanical cutting

The drawing shows the proposed device.

The device contains a plasma torch 1, a milling cutter 2 and a special knife 3, which are fixed at a certain distance 1 gei j from each other. The blank 4 moves at a feed rate S, while the plasma jet 5 cuts off the main part of the allowance h, which in the form of a hot bayonet 6 is bent out with the knife 3 o to the side, freeing the treatment area for the milling cutter 2, which mechanically removes a part of the allowance heated prior to softening by the plasma jet 5 when cutting.

The invention will improve the quality of -15 in the machined surface of chamfers and edges on difficult-to-machine materials, as well as improve performance,

Claims (2)

1. A method of laser-mechanical processing, in which the plasma jet is moved in front of the cutting tool at the same speed, characterized in that, in order to increase productivity and to obtain high quality machined surface of chamfers and edges on difficult-to-process materials, the plasma jet cuts off part of the removed allowance which is then folded down, after which the remainder of the allowance heated during the cutting process is removed with a mechanical cutting tool. 2. A device for carrying out the method according to claim 1, comprising a plasma torch and a cutting tool, characterized in that, in order to increase productivity, a knife is located between the plasma torch and the mechanical cutting tool. Sources of information taken into account in the examination 1. BYKHOVSKY DG Plasma cutting. L., Mechanical Engineering, 1972, p. 157. 2, UK Patent No. 135114 Cl. In 23 R 25/00, 1976.