CN203124943U - Plasma cutting torch nozzle - Google Patents
Plasma cutting torch nozzle Download PDFInfo
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- CN203124943U CN203124943U CN 201320122941 CN201320122941U CN203124943U CN 203124943 U CN203124943 U CN 203124943U CN 201320122941 CN201320122941 CN 201320122941 CN 201320122941 U CN201320122941 U CN 201320122941U CN 203124943 U CN203124943 U CN 203124943U
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- cutting
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- cutting torch
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Abstract
The utility model discloses a plasma cutting torch nozzle which comprises a hollow conical nozzle body. The front end of the nozzle body is provided with a cylindrical nozzle passage. The length-to-diameter ratio L/D of the nozzle passage ranges from 1 to 2.4. The plasma cutting torch nozzle is made of IACS (international annealed copper standard) high-conductivity material more than 90% in conductivity. Surface roughness of the inner surface of the channel passage is smaller than Ra1.6. The plasma cutting torch nozzle has the advantages that burn of the nozzle by plasma arc can be reduced effectively, the service life of the nozzle is prolonged significantly, and application cost is reduced.
Description
Technical field
The utility model relates to a kind of plasma cutting machines, is specifically related to a kind of plasma cutting nozzle of cutting torch.
Background technology
The plasma cutting nozzle of cutting torch is the consumable accessory in the plasma cutting machines.Existing plasma cutting nozzle of cutting torch, in order to improve cutting power, the draw ratio L/D design load of its nozzle oral area big (be commonly L/D〉2.4), draw ratio is more big, flow through time of nozzle cavity of plasma arc is also just more long, and the time that nozzle is burnt by plasma arc is also just long; Again owing to be subjected to plasma gas flow velocity stability influence, it is overheated and cause the nozzle scaling loss to be prone to nozzle.
The existing normally used material of nozzle material is alloyed copper, and the electric conductivity of alloyed copper, thermal conductivity are relatively poor, thus cause the metal surface resistance of jet hole big, calcination jet hole easily.
Based on above reason, the existing easy scaling loss of plasma cutting nozzle of cutting torch, the cutting life-span is short, has greatly improved processing cost.
Summary of the invention
Technical problem to be solved in the utility model is to solve the plasma cutting nozzle of cutting torch shortcoming that scaling loss is fast when cutting, the cutting life-span is short.
For addressing the above problem, plasma cutting nozzle of cutting torch of the present utility model comprises the conical nozzle body of hollow, and the nozzle body front end is provided with the nozzle passage of cylindrical shape, and the ratio range of the draw ratio L/D of nozzle passage is 1～2.4; The whole conductance that adopts of plasma cutting nozzle of cutting torch of the present utility model is made greater than the high conductivity material of 90%IACS; The surface roughness of its nozzle passage inner surface is below Ra1.6.
After adopting technique scheme, because the scope of nozzle passage draw ratio (the diameter ratio of axial length and circular hole) L/D is 1-2.4, thereby reduced the sheet resistance between nozzle and the plasma arc, shorten plasma arc and flow through time of nozzle passage, reduce plasma arc burning nozzle passage.The nozzle passage roughness makes and has improved the plasma arc flow velocity by the plasma arc gas nozzle passage of flowing through fast below Ra1.6, reduces the high temperature at plasma gas center to the heat transmission of nozzle passage.Thereby can effectively reduce plasma arc to the burning of nozzle, significant prolongation nozzle service life, reduce use cost.
Further, plasma cutting nozzle of cutting torch of the present utility model, the draw ratio of its nozzle passage is 1.4 to 2.2.Can further improve the cutting life-span.
Further, plasma cutting nozzle of cutting torch of the present utility model, the draw ratio of its nozzle passage is 2, the surface roughness of nozzle passage inner surface is Ra1.0, can reach maximum life span.
Description of drawings
The profile of the plasma welding torch that Fig. 1 is made up of plasma cutting nozzle of cutting torch, electrode, radome;
Fig. 2 is the structural representation of plasma cutting nozzle of cutting torch of the present utility model;
Among Fig. 2: L represents the length of nozzle passage; D represents the diameter of nozzle passage.
The specific embodiment
Below in conjunction with accompanying drawing the utility model is described further:
As shown in Figure 1, plasma welding torch is made of nozzle body 1, electrode 2, radome 5, electrode 2 is installed in nozzle body 1 inner chamber, radome 5 is installed in nozzle body 1 front position and assembling between the two forms the cooling chamber 3 around nozzle body 1 front end, outside secondary air flows in cooling chamber 3 during work, the arrow indication in streamer mode such as the accompanying drawing.
Wherein electrode 2 is made of two parts: electrode 2 front end centres are provided with the emitter 21 for the emission of plasma arc; Electrode 2 inside are formed with a cooling chamber 22.
As shown in Figure 2, the plasma cutting nozzle of cutting torch, the conical nozzle body 1 that comprises hollow, nozzle body 1 front end is provided with the nozzle passage 10 of cylindrical shape, plasma arc 4 is realized extruding by nozzle passage 10 and is shunk and raising density, plasma arc is heated up and is accelerated simultaneously, sprays to workpiece then, makes the workpiece local melting so that workpiece is cut.
The plasma arc production process, at first be to apply high frequency voltage between electrode 2 and the plasma cutting nozzle of cutting torch, the guide's arc that ignites discharges between them, the plasma air-flow produces from plasma cutting nozzle of cutting torch rear cavity, along with flowing of plasma air-flow, guide's arc that electrode produces is shifted to plasma cutting nozzle of cutting torch front end center, simultaneously the dump of executing between electrode 2 and the plasma cutting nozzle of cutting torch, interrupt guide's electric arc, main arc ignites.Plasma arc sprays to the nozzle passage 10 of spray nozzle front end at a high speed.By nozzle passage 10 plasma arc is pushed then and compress, improve density, produce the high temperature and high speed injection stream, workpiece is cut.
Because each starting the arc rises and cuts or bore a hole all is to produce guide's arc by elder generation between electrode 2 and the plasma cutting nozzle of cutting torch, and the high temperature article on plasma cutting nozzle of cutting torch front end of guide's arc is a kind of damage.In the prior art, be to improve cut quality, what take is the method for simple increasing nozzle passage draw ratio L/D, and its draw ratio generally requires greater than 2.4.Before the main arc that ignites, guide's electric arc is trapped near the plasma cutting nozzle of cutting torch oral area always, because its big L/D ratio design, longer in the time that the nozzle oral area stops, heat more concentrates on the oral area of nozzle.That is to say to have cut at every turn and cut or bore a hole all in the loss of aggravation to nozzle passage 10.Thereby the big L/D ratio design will obviously be shortened the plasma cutting nozzle of cutting torch life-span.
Experiment is found: the influence of 10 roughness article on plasma cutting nozzle of cutting torch life-spans of nozzle passage greatly, to carrying out surface treatment at nozzle passage 10 inner surfaces, reduce surface roughness, can reduce air-flow by resistance, the raising plasma flow velocity of metal surface, shorten arc in the nozzle oral area surface time of staying, thereby improve the metal life-span.
Thereby plasma cutting nozzle of cutting torch of the present utility model comprises the conical nozzle body 1 of hollow, and nozzle body 1 front end is provided with the nozzle passage 10 of cylindrical shape, and the ratio range of the draw ratio L/D of nozzle passage 10 is 1～2.4.The surface roughness of nozzle passage 10 inner surfaces is below Ra1.6.
After adopting such scheme, plasma cutting nozzle of cutting torch of the present utility model can reach higher cutting power, can effectively improve the metal life-span again.
Experiment is also found: the electric conductivity of nozzle influences burning of nozzle, and the material of poor electric conductivity burns more fast.
Thereby the whole conductance that adopts of this plasma cutting nozzle of cutting torch is made greater than the high conductivity material of 90%IACS, and adoptable material ranges is extensive, and for example T2, T1, TU2T can further improve service life.
By calorimetric analysis and equate the oral area loss of cutting steel plate rear nozzle under the condition, it is as follows that plasma cutting nozzle of cutting torch of the present utility model and contrast product are compared the result:
The air-flow that contrast product is drawn is the column air-flow, and the air-flow that nozzle is drawn in the utility model is the spindle air-flow; Both temperature all can reach more than 900 degree.Because difference and nozzle passage 10 length of its airflow shaped shorten, the flow velocity of air-flow of the present utility model (arc column) will be higher than contrast product, thereby has guaranteed cutting power, and electric arc shortened greatly in the time that the nozzle oral area stops simultaneously, had prolonged the metal life-span.
Cutting will take place after the generation of guide's arc nozzle will carry out the gas switching earlier, switches the required time of gas, wishes that in theory gas switches the synchronization of finishing in the main arc appearance.This whole handoff procedure is finished at the oral area of nozzle.Yet replacement process is subjected to the influence of cutting steam supply time length, before pilot arc disappears, the cutting aperture inboard because of and electrode between discharge continue to heat.Because of the big draw ratio design of contrast product, air-flow (arc column) becomes column easily to cause the fusion of cutting aperture internal surface, and ablated area increases.
After the voltage change such as rising of the arc voltage that cutting aperture or little circular arc or acute angle cause because of shape, electric arc interrupts guaranteeing electric current, gas pressure to a certain degree, the setting value of cutting speed in order to prevent from cutting, therefore more prolong the time of pilot arc, easilier stayed the ablation scar on the cut workpiece surface.
Embodiment one
Cutting object: thickness is 25MM, and material is the ship plate of Q235 carbon steel; Experimental technique: perforation back cutting endoporus Φ 30 cylindrical Φ 40mm annular workpieces.By the perforation number of times of cut workpiece after the starting the arc, verify the cutting of plasma cutting nozzle of cutting torch of the present utility model and contrast product life-span and cut quality, and carry out the utility model result according to the consume state of experimental phenomena and consumable accessory and prove.
In the present embodiment, the draw ratio L/D=2 of nozzle passage 10; The surface roughness of nozzle passage 10 inner surfaces is Ra1.6.Nozzle as a comparison case, its L/D=2.5.In the lifetime of a nozzle, add up quantity and the checking cutting effect of its steel plate perforation.
Experimental result:
1) nozzle accumulative total cut workpiece number of the present utility model: 530; Perforation number: 1060 times; Cutting Length: 116.5m.Cutting back consumable accessory state: a small amount of scaling loss of nozzle head, blackening, oxidized, the hole becomes greatly a little, the slight internal scaling loss, endoporus adheres to a small amount of slag.
2) contrast groups accumulative total cut workpiece number: 320; Perforation number: 640 times; Cutting Length: 70.3m.Cutting back consumable accessory state: the nozzle scaling loss, blackening, oxidized, Kong Bianda is crooked, inner scaling loss, endoporus adheres to a small amount of slag.
Experimental result can be found, nozzle of the present utility model, and in the perforation purposes, its life-span is 1.65 times of Comparative Examples, thereby the utility model can reduce production costs greatly, and production efficiency is provided.
Embodiment two
Cutting object: thickness is 20MM, and material is the ship plate of Q235 carbon steel.In the present embodiment, plasma cutting nozzle of cutting torch of the present utility model, the L/D=2 of its nozzle passage 10; Nozzle passage 10 the Inner hole wall be polished into surface roughness Ra 1.0; The material of nozzle is copper product T2.Contrast groups L/D=2.8.In the lifetime of a nozzle, add up the line length of its cutting steel plate.Line of cut length is 1,657,566mm in the plasma cutting nozzle of cutting torch of the present utility model, lifetime; Contrast groups is 919,193mm at the line length of nozzle cuts sheet material in useful life period; Nozzle of the present utility model is 1.8 times of imported product service life, can reduce production costs greatly.
Embodiment three
Unique difference of present embodiment and embodiment two be with nozzle passage 10 the Inner hole wall be polished into surface roughness Ra 0.8.In the lifetime of a nozzle, add up the line length of its cutting steel plate.Line of cut length is 1,463,786mm in the plasma cutting nozzle of cutting torch of the present utility model, lifetime; Contrast groups is 919,193mm at the line length of nozzle cuts sheet material in useful life period; Nozzle of the present utility model is 1.6 times of imported product service life.
Found through experiments, plasma cutting nozzle of cutting torch of the present utility model, the whole conductance that adopts is greater than the high conductivity material manufacturing of 90%IACS, the draw ratio of nozzle passage 10 is set to 1.4 to 2.2, the Inner hole wall surface roughness of nozzle passage 10 can reach service life preferably below Ra1.6.
Also find by experiment, plasma cutting nozzle of cutting torch of the present utility model, the whole conductance that adopts is greater than the high conductivity material manufacturing of 90%IACS, the draw ratio L/D=2 of its nozzle passage 10; It is optimum combination that the Inner hole wall of nozzle passage 10 is polished into surface roughness Ra 1.0, under the prerequisite that guarantees cut quality, can reach the highest service life.
Plasma cutting nozzle of cutting torch of the present utility model is 10MM～25MM in cutting thickness, when material is the ship plate of Q235 carbon steel, especially possesses very high cost performance.
Plasma cutting nozzle of cutting torch of the present utility model by the optimal design to the surface roughness of nozzle passage 10 draw ratios, nozzle-integrated conductance, nozzle passage 10 inner surfaces, significant prolongation nozzle service life, reduces use cost.
Claims (3)
1. plasma cutting nozzle of cutting torch, comprise the conical nozzle body (1) that adopts the hollow that conductance makes greater than the material of 90%IACS, nozzle body (1) front end is provided with the nozzle passage (10) of cylindrical shape, it is characterized in that: the ratio range of the draw ratio L/D of nozzle passage (10) is 1～2.4; The surface roughness of nozzle passage (10) inner surface is below Ra1.6.
2. plasma cutting nozzle of cutting torch according to claim 1, it is characterized in that: the draw ratio of nozzle passage (10) is 1.4 to 2.2.
3. plasma cutting nozzle of cutting torch according to claim 1, it is characterized in that: the draw ratio of nozzle passage (10) is 2, the surface roughness of nozzle passage (10) inner surface is Ra1.0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320122941 CN203124943U (en) | 2013-03-19 | 2013-03-19 | Plasma cutting torch nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320122941 CN203124943U (en) | 2013-03-19 | 2013-03-19 | Plasma cutting torch nozzle |
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| Publication Number | Publication Date |
|---|---|
| CN203124943U true CN203124943U (en) | 2013-08-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320122941 Expired - Fee Related CN203124943U (en) | 2013-03-19 | 2013-03-19 | Plasma cutting torch nozzle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103143826A (en) * | 2013-03-19 | 2013-06-12 | 安徽西锐重工科技有限公司 | Spray nozzle of plasma cutting torch |
-
2013
- 2013-03-19 CN CN 201320122941 patent/CN203124943U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103143826A (en) * | 2013-03-19 | 2013-06-12 | 安徽西锐重工科技有限公司 | Spray nozzle of plasma cutting torch |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130814 Termination date: 20160319 |