CN104162734A - Arc forming method for plasma cutting machine - Google Patents

Abstract

The invention discloses an arc forming method for a plasma cutting machine, and relates to an arc forming method of the cutting machine. The arc forming method includes the steps that a plasma power supply gives out an arcing signal; compressed air enters a fixed sleeve to be divided in the fixed sleeve; the first part of the compressed air enters a flow-fixed sleeve, then flows through a spiral air guide groove and forms spiral air flow through the spiral air guide groove; the spiral air flow is heated, resolved and ionized through arcing and finally a spiral fiber bundle which is highly centralized is formed; the second part of the compressed air sequentially flows through a first gap and an air passageway, enters a containing space inside a nozzle protection cap and is finally sprayed outwards through a third through hole to form protective air flow, wherein the spiral fire bundle is protected at the center through the protective air flow. Sections of panels cut by the plasma cutting machine are smooth, the inclination of notches can be ensured within three degrees, no metal residue is left on the back faces of the notches, and secondary machining is not needed.

Description

CUT goes out arc method

Technical field

What the present invention relates to a kind of cutting machine goes out arc method, and a kind of CUT goes out arc method specifically.

Background technology

In current sheet material manufacture field, for hard plate material especially steel plate, add man-hour, using the most common cutting machine is CUT, CUT is comprised of seven parts conventionally, i.e. power supply, control system, water-cooling system, gas device, plasma cutter head device, CUT body and processing work platform.Current CUT cutter head device is comprised of plasma cutting gun and injector electrode, when plasma power supply sends starting the arc signal, injector electrode sends electric arc, compressed air heats, decomposes and ionizes in electric arc, the oxygen cutting metal generation exothermic reaction generating, form otch, existing CUT can only carry out roughing to sheet material, not only there is the problem that otch gradient is excessive, edge is more coarse in the workpiece processing, and need to carry out secondary operations to completing the workpiece of cutting, be therefore necessary to improve.

Summary of the invention

The object of the invention is in order to overcome the weak point of background technology, and provide a kind of CUT to go out arc method.

To achieve these goals, technical scheme of the present invention is: CUT goes out arc method, it is characterized in that: comprise that plasma power supply sends starting the arc signal, compressed air enters in fixed cover and in fixed cover, splits into first's compressed air and second portion compressed air, wherein, first's compressed air is entered in constant current cover by air-guiding hole and constant current cover top, entering into first's compressed air in constant current cover can flow through and be located at the helical form wind guide tank of cutting electrode upper end, and under the effect of helical form wind guide tank, form helical form air-flow, helical form air-flow heats up under arcing, decompose, ionization, the final helical form fire bundle that produces high concentration, second portion compressed air is flowed through successively and is located at the first gap between fixed cover and constant current cover, be located at the air duct of fixed cover lower end, and enter in the appearance matter space of protecting in mouth cap, final second portion compressed air sprays and forms protectiveness air-flow by being located at the third through-hole that protects mouth cap lower end, described protectiveness air-flow protects helical form fire bundle in central authorities.

Due to the fire bundle gushing out in the shape of a spiral; and there is the air-flow of protectiveness to this helical form fire Shu Jinhang protection; therefore in practical work process; the fire bundle that contains CUT ejection of the present invention is high concentration shape; cuts sheet material process moderate heat bundle rotating speed can not reduce and deformation less; contain that the sheet material tangent plane that CUT of the present invention cuts out is more smooth, otch gradient can guarantee three degree with interior, the otch back side is residual without metallic residue, does not need to carry out secondary operations again.

Accompanying drawing explanation

Fig. 1 is that constant current cover does not comprise air-guiding hole, and air duct is while being fourth hole, the syndeton schematic diagram of the present invention and plasma cutting gun.

Fig. 2 is that constant current cover does not comprise air-guiding hole, and air duct is when be comprised of the second gap and fifth hole, the syndeton schematic diagram of the present invention and plasma cutting gun.

Fig. 3 is the structural representation of cutting head.

Fig. 4 is the structural representation of constant current cover.

Fig. 5 is the structural representation of fixed cover.

Fig. 6 is the structural representation that protects mouth cap.

Fig. 7 is the structural representation of cutting electrode.

1-cutting head in figure, 11-location-plate, 2-cutting electrode, 21-helical form wind guide tank, 22-zirconium hafnium tungsten alloy electrode, 23-the first cylinder, 24-the second cylinder, 25-three cylindrical, 3-constant current cover, 31-air-guiding hole, 4-fixed cover, 41-positioning round table, 42-the first gap, 43-the second gap, 5-protects mouth cap, 6-plasma cutting gun, 71-the first through hole, 72-the second through hole, 73-third through-hole, 74-fourth hole, 75-fifth hole, 8-air duct.

The specific embodiment

Below in conjunction with accompanying drawing, describe performance of the present invention in detail, but they do not form limitation of the invention, only for example.By explanation, make advantage of the present invention more know and easily understand simultaneously.

Consult accompanying drawing known: CUT goes out arc method, it is characterized in that: comprise that plasma power supply sends starting the arc signal, compressed air enters in fixed cover 4 and in fixed cover 4, splits into first's compressed air and second portion compressed air, wherein, first's compressed air overlaps 3 tops by air-guiding hole 31 and constant current and enters in constant current cover 3, entering into first's compressed air in constant current cover 3 can flow through and be located at the helical form wind guide tank 21 of cutting electrode 2 upper ends, and under the effect of helical form wind guide tank 21, form helical form air-flow, helical form air-flow heats up under arcing, decompose, ionization, the final helical form fire bundle that produces high concentration, second portion compressed air is flowed through successively and is located at the first gap 42 between fixed cover 4 and constant current cover 3, be located at the air duct 8 of fixed cover 4 lower ends, and enter in the appearance matter space of protecting in mouth cap 5, final second portion compressed air sprays and forms protectiveness air-flow by being located at the third through-hole 73 that protects mouth cap 5 lower ends, described protectiveness air-flow protects helical form fire bundle in central authorities.

During real work, the present invention also comprises that CUT goes out arc device, go out fixed cover 4, the cutting electrode 2 of being located at fixed cover 4 inside that arc device comprises that upper end is connected with plasma cutting gun 6, be sleeved on cutting electrode 2 upper ends and be positioned at fixed cover 4 inside constant current cover 3, be located at fixed cover 4 lower ends and protecting mouth cap 5, be located at that to protect mouth cap 5 inner and be the cutting head 1 of hollow structure for hollow structure.

Cutting electrode integral body is made with red copper, cutting electrode 2 upper ends are provided with the helical form wind guide tank 21 that cross section is rectangular teeth structure, go out the large footpath 12mm of the helical form wind guide tank described in arc device, path 8mm, pitch of thread 2mm, line number is 9, during real work, helical form wind guide tank can also be other dimensional parameters, as long as helical form wind guide tank is rectangular teeth structure.Cutting electrode 2 lower ends pass from fixed cover 4 bottoms and are positioned at cutting head 1, and cutting electrode 2 middle parts, lower end are provided with zirconium hafnium tungsten alloy electrode 22 (content proportioning 1:1:8), and the length of zirconium hafnium tungsten alloy electrode 22 should be not less than 2mm.

Cutting electrode 2 comprise be located at middle part the second cylinder 24, be connected the first cylinder 23 with the second cylinder 24 upper ends, with the three cylindrical 25 being connected with the second cylinder 24 lower ends, helical form wind guide tank 21, the three cylindrical 25 middle parts, lower end that the second cylinder 24 is provided with rectangular dentation are provided with zirconium hafnium tungsten alloy electrode 22.

Preferably, described the first cylinder 23, the second cylinder 24 and the second cylinder 25 are monolithic construction, and the diameter of the second cylinder 24 is greater than the diameter of the first cylinder 23, and the diameter of the first cylinder 23 is identical with the diameter of three cylindrical 25.

Cutting head integral body is made with red copper, and cutting head 1 top is provided with location-plate 11, and cutting head 1 center bottom is provided with for spraying the first through hole 71 of plasma fire bundle.

The whole material of protecting mouth cap 5 is red copper, protecting mouth cap 5 upper ends is threaded with fixed cover 4 lower ends, the lower end of protecting mouth cap 5 is provided with a plurality of settings uniformly at intervals and for spraying the third through-hole 73 of air, protects mouth cap 5 center bottom and be provided with the second through hole 72 coaxial with fire jetting hole and that restraint for spraying plasma fire.

Distance between described third through-hole 73 and cutting head 1 bottom is 3～4mm, and the aperture of third through-hole 73 is 0.5～1mm, and adjacent pitch of holes of being separated by between third through-hole 73 is 1～3mm.The axis of described third through-hole 73 and the angle between horizontal plane are 45～90 °.

The whole material of fixed cover is industrial insulating ceramics, fixed cover 4 inner sides, bottom are provided with positioning round table 41, the sidewall of fixed cover 4 and constant current are overlapped between 3 upper ends and are provided with the first gap 42, and described the first gap 42 is communicated with the appearance matter space in protecting mouth cap 5 by being located at the air duct 8 of fixed cover 4 lower ends.

During actual installation, fixed cover lower end is external screw thread, and protects mouth cap upper end screw-internal thread fit; There is internal thread fixed cover upper end, and internal thread coordinates with plasma cutting gun.

The sidewall of constant current cover 3 is provided with the air-guiding hole 31 that a plurality of intervals are in tilted layout, and constant current is overlapped 3 lower ends and is connected with positioning round table 41 by described location-plate 11.The axis of described air-guiding hole 31 and the angle between horizontal plane are 45～75 °, and the aperture of air-guiding hole is 1～1.5mm, and the pitch of holes between adjacent two air-guiding holes is 1～2.5mm.Preferably, on constant current cover 3, be covered with air-guiding hole 31.

Described air duct 8 can be following two kinds of structures:

A. air duct 8 is for being located at the fourth hole 74 of fixed cover 4 lower ends, and fourth hole 74 upper ends are communicated with described the first gap 42, and fourth hole 74 lower ends are communicated with the appearance matter space in protecting mouth cap 5.

B. air duct 8 comprises and is located at fixed cover 4 lower ends and the second gap 43 between 3 lower ends is overlapped in constant current, on described location-plate 11 and positioning round table 41, be equipped with a plurality of fifth holes 75 that arrange uniformly at intervals, fifth hole 75 upper ends are communicated with the second gap 43 and the first gap 41 successively, fifth hole 75 lower ends with protect mouth cap 5 in appearance matter space be communicated with.The aperture of described fifth hole 75 is 0.5～1mm, and the pitch of holes between adjacent two fifth holes 75 is 1～3mm.

Described fixed cover 4, constant current cover 3, cutting electrode 2, protect between mouth cap 5 and cutting head 1 and be coaxially arranged.

Due to go out arc device by cutting head, cutting electrode, constant current cover, fixed cover, protect mouth cap five parts and form, therefore it is more accurate, compact to go out the structure of arc device.Due to cutting head, cutting electrode with to protect mouth cap be mainly to be made by red copper, constant current cover and fixed cover are mainly made by industrial ceramic, therefore it is lower to go out the manufacturing cost of arc device.When needs will go out arc device and be installed on CUT, staff only needs to go out arc device and is placed in plasma cutting gun lower end, installs simple and without danger.Finally; owing to going out fire bundle that arc device gushes out in the shape of a spiral; and there is the air-flow of protectiveness to this helical form fire Shu Jinhang protection; therefore in practical work process; the fire bundle that contains the CUT ejection of arc device is high concentration shape; cuts sheet material process moderate heat bundle rotating speed can not reduce and the deformation of fire bundle less; contain that the sheet material tangent plane that the CUT of arc device cuts out is more smooth, otch gradient can guarantee three degree with interior, the otch back side is residual without metallic residue, do not need again sheet material to be carried out to secondary operations.

Other unaccounted part all belongs to prior art.

Claims (1)

1. CUT goes out arc method, it is characterized in that: comprise that plasma power supply sends starting the arc signal, compressed air enters in fixed cover (4) and in fixed cover (4), splits into first's compressed air and second portion compressed air,

Wherein, first's compressed air is entered in constant current cover (3) by air-guiding hole (31) and constant current cover (3) top, entering into first's compressed air in constant current cover (3) can flow through and be located at the helical form wind guide tank (21) of cutting electrode (2) upper end, and under the effect of helical form wind guide tank (21), form helical form air-flow, helical form air-flow heats up, decomposes, ionizes under arcing, the final helical form fire bundle that produces high concentration

The air duct (8) that second portion compressed air is flowed through successively and is located at the first gap (42) between fixed cover (4) and constant current cover (3), is located at fixed cover (4) lower end; and enter in the appearance matter space of protecting in mouth cap (5); final second portion compressed air sprays and forms protectiveness air-flow by being located at the third through-hole (73) that protects mouth cap (5) lower end, and described protectiveness air-flow protects helical form fire bundle in central authorities.