SU759254A1 - Apparatus for directing movement of portable gas cutting machine - Google Patents

Description

The invention relates to gas processing of metals, and more specifically to auxiliary devices used to direct the working movement of gas cutting machines along a given cutting line.

The invention can most effectively be used to cut curved contours of sheet metal parts with portable gas-cutting machines.

A well-known flexible guide for setting the working displacement of portable gas-cutting machines ¹⁰ . This flexible rail is a metal strip with a thickness

1.5-2.0 mm, while the width of the strip is ΙΟΙ 5 mm wider than the gauge of the gas-firing machine. On the right side of the rail at a distance of ¹⁵

5-10 mm made a groove with a width of 1.52.0 mm and a depth of 1 mm for contact with the support roller of a moving gas-cutting machine [1).

It is also known a device for guiding ²⁰ movements of portable gas-cutting machines, comprising a flexible guide with magnets fixed on it [2],

2

This device is costly to set up auxiliary time.

The aim of the invention is to increase productivity by reducing the auxiliary time for tuning.

This goal is achieved by the fact that the guide is made in the form of a package of plates connected to each other movably, with some of the plates made of elastic material, and the remaining plates are made of plastic.

FIG. 1 shows a device for guiding the movement of portable gas-cutting machines; general form; in fig. 2 - section plates; in fig. 3 - the device is in working position.

The device for guiding the movement of portable gas-cutting machines consists of a flexible guide, made of a set of plates, bounded on both sides by elastic (for example, steel) plates 1, and inside there are plates 2 and 3 of plastic material. Plates 1 and 2 are interconnected by screws 3 installed in the slots 4 for. ensure mobility plas759254

Tin relative to each other. Plates 2 are made of annealed oxygen-free copper brand MB according to GOST 859-66 with a thickness of 0.8-1.2 mm. Plates 1 are made of steel spring tape grade 6ОС2А according to GOST- ₅

-2614-65 thickness of 0.4-0.6 mm. The length of the entire guide is equal to the length of the cut. The guide is equipped with a set of compact permanent magnets 5 with the clamping force of each 0.1 kgf for attaching the device ₁₀

to sheet metal 6.

The device works as follows.

Before starting work, the guide is bent by preliminary marking or by a template in order to obtain the necessary curvature- ₁₅ linear cut contour. In this case, in the steel plates 1, elastic deformation forces arise, which tend to straighten them to their initial position, which allows avoiding bends and obtaining smooth curvature radii. At the same ₂ θ time, the small thickness of the plates 1 and their great flexibility allows to produce almost any bends. Copper plates 2, located between the steel plates 1, due to their high plasticity, repeat the bends of ₂ 5 steel plates 1. Curved profile. the elastic ruler will be maintained under the condition that the elastic force of the steel plates 1 will be equal to or less than the force required to straighten the curved copper plates 3θ 2, i.e. Р ₂ , where Р, is the force of elastic defor- ₍

matsi steel plates; P ₂ - the force of elastic deformation of copper plates.

35

where is e

3

. ί

- modulus of elasticity (E _cx = 2,1-10 ⁴ kg / mm ² ';

It = 1.15-10 ⁴ kg / mm ² ); _g

- moment of inertia of the section (3 “^

4Ζ ’

where L is the plate width, K is the plate height ₄₀ );

- flexure deflection

^ Art. ³ Art. "

e ³ g "

'therefore E _st Zet ⁼ Em'Zm ^or Lm = 1.83 b _st .

From here we can conclude that. the total thickness of the copper plates should be approximately twice the total thickness of the steel plates. We practically accept the cross section of a flexible ruler, equal to 10x30mm. When bending a flexible ruler, its copper plates 2 and steel plates 1 slide along each other’s surface, which makes it possible to avoid the appearance of a corrugation along the internal radii of curvature. The curved ruler is fixed on the sheet 6 with the help of permanent magnets 5, the roller 7 of the gas-cutting machine (not shown) is mounted on it and the cutting is started in the usual way.

The proposed device for the direction of movement of portable gas-cutting machines in comparison with the known samples of similar equipment allows to increase the productivity of gas cutting by reducing the setting time of the gas-cutting machine for its direction. given cut line ..

Claims (1)

Claim A device for guiding the movement of portable gas-cutting machines, containing a flexible guide with magnets attached to it, characterized in that, in order to increase productivity by reducing the auxiliary time for tuning, the guide is made in the form of a package, plates connected one to another with a moveable part of the plates made of elastic material, and the remaining plates of plastic.