DE1627459A1 - Method for ignition, if necessary for changing the profile of a crack removal process by means of a shuttering burner - Google Patents

Description

L * AIR LIQUIDE, SOCIETE AKONYME POUR L »ETÜDE KP h » EXPLOIl ^ ÄTION DES PROCEDES GEORGES CLAUDE PAEES (7)

Process for ignition, if necessary for modification of the profile of a crack removal process by means of a peeling furnace

Priority:

based on the registration P.Vv 8 7 211 of December 13, 1966 in Prankfeich

This invention relates to a method for ignition, if necessary for changing "per" profiles * $ ± nks ^; RiÖteeeelti · * generation process · by means of a · peeling torch on a workpiece «This acts on the workpiece with one or more oxygen rays, through one or more flames, the main task of which is to preheat the metal to a sufficient temperature» so that it is in Oxygen burns, and if necessary by auxiliary heating means such as an iron additive in the form of powders or rods, a flammable gas or by heating with a plasma jet.

It is known to use a peeling torch to spot surface defects (Furrows, notches, burn-ins, inclusions, etc.) on workpieces, how to remove raw steel blocks, knobs and slabs.

100830/0201

BATH

The peeling burner can be attached above the piece, however mostly you let the piece pass under the peeling burner, the movement being generally parallel to the longitudinal axis of the piece runs because the mistakes are often in this Direction have their greatest extent. This crack removal There is, however, a process at the defect where the peeling burner begins to work, giving rise to defects such as a hole, sharp edges or point ignition, which eventually give rise to wrinkles and so on.

The method according to the invention, which also apply if the peeling burner is pushed forward automatically, this avoids this error j it is characterized by that it comprises the following sequences of movements, preferably in the described arrangement *

A * The peeling burner is arranged so that the axis of its Make an angle between the nozzle and the surface of the piece 70 -r 90 °, preferably «wipe? 5 - 90 ° forms. the The hot flame of the burner is in its strength for the ignition provided and the flow rate of cutting oxygen is either weak or zero «

B. Allow the nozzle to do at least one of the following movements perform at the same time or one after the other with the other, depending on how the two movements are coupled with each other are"

BATH ORIGINAL

109830/0281

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1. Rotation around an axis parallel to the nozzle axis or together with this one.

2. Relocation of the peeling burner, if necessary with a temporary shift of the piece;} during this movement or movements, the amount of cutting oxygen may be changed in this way » that it has its correct value for crack removal or a weaker value, but never is zero.

G. Tilt the peeling torch and set the amount of cutting oxygen to its value for removing cracks » if it doesn't already have this value; these two operations can be done simultaneously or on top of each other, the inclination being made by moving his Axis by an equal point on the surface of the Lets pass through *

This procedure ignites the work area without errors and, if equips material in the necessary depth and only to the Removing damaged areas «It also allows metal to be removed from the to remove the entire surface of the piece »by removing the The work process over the cracks, existing inclusions, etc. can go deeper «The drawing shows schematically and only by way of example, a preferred embodiment of the egg according to the invention Procedure. It is assumed that, as is generally the case, the surface to be cleared of cracks is horizontal and the peeling burner is above it.

BAD ORiQJNAL

ί09830 / 0281 ~ ^k "

Figure T shows an elevation, partly in section the plane I-I of Fig. 2 with the end of a peeling burner, as applicable to the method of the invention.

Fig. 2 shows the same end piece seen from below.

Fig. 3 shows two successive positions of the peeling burner.

FIGS. K and 5 show the peeling burner in one of the preceding positions and in a following position or in the projection onto a vertical plane, parallel to the plane 26, 28 of FIG. 5 and in a top view.

The end of the burner shown in Fig. 1 and 2 has a channel parallel to the axis 2-2 (kj for the oxygen to remove cracks, a part (6) with holes (8) for the passage of the gas mixture that generates the heating flame (10) , a small nozzle made of two parts, between which there is the passage (l4) for an auxiliary heating medium, iron powder or flammable gas ♦

The flame (16) is created by the combustion of this resource formed in part of the cutting oxygen

In Figures 3 ,. ^ and 5 is the peeling burner end in larger Length ^ but shown in very schematic holes * The surface of the workpiece to be freed from hoisting

BATH ORIGINAL is shown at (18).

, 1Β27459

By peeling burner (20) is shown at the time where it approaches the surface (18). The preheating flame has her for the onset of the process of eliminating hate Intended Intensity, which is the amount of cutting oxygen weak or zero; the axis 2-2 of the torch is vertical to the surface (18), but could use this one Form an angle that decreases to 8 5 ° or even down to 70 °. If the control of the process is running with great temporal accuracy can be made so can already control the amount of tendon oxygen at this point to be tall

In the position 22 the peeling torch is approached to the workpiece / and about the axis 2-2, as indicated by the arrow (23), rotated in order to expand the oxidation bath and when igniting a normal width without too much penetration

and to result in unevenness * This rotation can also be done around another axis parallel to axis 2-2 «While these approaching and turning movements that follow one another or at the same time, the amount of cutting oxygen is brought to a value not equal to Oj that which is intended Flow rate for the crack removal can reach · During these two movements and for the ignition The following stages can be used by a means accomplish how; .

Injecting. Iron powder or combustible gas channel

Introducing a steels tabes in di

Heating of the surface zone (18) where the crack is removed should start by a plasma jet

In Figures 4 and 5 the peeling burner is again in its place Layer (22) drawn, in one of the layers (24) it is in the course of the crack removal, in particular on Beginning of this process. To the peeling burner from the location (22) to get into position (24), one inclines it, with its axis passing through an equal point (27) of the Workpiece can run · The angle (32) that the Axis (26,28) of the nozzle in position (24) with its projection on the surface of the piece forms is greater than 20 ° The angle (34) that the projection of the nozzle axis on this surface with a straight line parallel to the relative displacement of the workpiece compared to the peeling torch, lies in this area and is less than 50 * During this inclination that you make as quickly as possible bring the amount of cutting oxygen to the for the crack removal has a predetermined value, if it has not already had this value

At the latest when the peeling burner has reached position (24), you move the workpiece and reduce the preheating flames if necessary During this shift one can see the angles (32) and (34), the flow rate of cutting oxygen and the feed rate of the piece in relation to the Modify the peeling torch if you have the profile, especially the wants to change the maximum depth and width of the crack removal process; selective crack removal can be

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10983 (1

take * i.e. »with more pronounced removal of metal in places * where this is necessary "in that than ζ · Β * the deep" of the process now change depth in a range from 0.5 to 15 leaves. The burner is on the back burner. And again brought into position (20) as soon as the operation is finished

The process can be changed »without losing the inventive concept is left. For example, the order of the process steps »those with A.B.C. are designated, leave * In process stage A, you can use an auxiliary burner give the indicated direction »during the actual Rissbeseltungsbrenner already the direction he was during who takes on the removal of cracks "

The machine can use several peeling torches to remove cracks have their directions and flow rates of cutting oxygen can be set independently.

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109830/0 ^ 81

Claims (2)

PATENT CLAIMS I. Process for ignition, possibly changing the profile of a locally limited crack removal process on the surface of a workpiece by means of a peeling burner, characterized in that the following stages, preferably in the sequence indicated, contain! A. The peeling torch for crack removal is positioned so that the axis of its nozzle forms an angle of between 70 and 90, preferably between 85 and 90, with the surface of the piece. The strength of the heating flame of the peeling burner is intended for ignition and the flow rate of cutting oxygen may be weak or zero both movements are coupled. 1. Rotation around an axis parallel to the nozzle axis, Or coincident with this one. 2 "Displacement of the peeling burner along its nozzle axis, in order to bring it closer to the piece to be freed of cracks, the peeling burner follows from time to time if necessary. the shifting of the piece, during this movement or movements one may change the cutting 1 0 9 8 3 0 / Π? β j BAD ■.: .. ■ ".". - - "9 -" ■■■■■. ■■ amount of oxygen so that you get your correct Has value or a weak fourth, but never zero i st α C. Tilt the peeling burner and set the amount of oxygen on their value for the removal of cracks one, if it doesn't already have this value; these two processes can be simultaneous or on top of each other done, the inclination being made by the axis of the torch is made to pass through the same point “. 2. The method according to claim T _1, characterized in that a means is used during sequence B to cause the onset of the,! where the crack removal is to begin, by means of a plasma jet ₀ 3 · The method according to claim 1, characterized in that dgß am At the end of sequence C and during the crack removal process that has now been initiated, the angle between the nozzle axis and its Projection onto the surface of the piece is larger than 20 V The angle that the image of the nozzle axis on the Surface of the workpiece with a straight line parallel to the relative Shift forms, lies in this area and is less than 50 °,. 109330/028 "} H-. Method according to claim. 1 and possibly 3, characterized in that the profile and the scope? (Width) of the crack removal process changed during this process by changing the angle, the flow rate of cutting oxygen, the speed of the piece with respect to the
Burner or several of these setting variables changed. bath 103830/0 281 Leers ei t