JP3189711U - Fusing crater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fusing crater suitable for a case where a flammable gas containing 18% by volume or more and 40% by volume or less of ethylene and the balance of which is hydrogen and unavoidable impurities is used as a combustion gas. SOLUTION: The crater which is a fusing crater containing 18% by volume or more and 40% by volume or less of ethylene and using a flammable gas whose balance is hydrogen and unavoidable impurities is an oxygen discharge port 14A for discharging oxygen gas. And a plurality of mixed gas discharge ports 13A that are arranged so as to surround the oxygen discharge port 14A and discharge the mixed gas of the combustible gas and the oxygen gas. The surface roughness of the inner wall surface 12C of the oxygen discharge port 14A is 1.4 μm or less in Ra, and the oxygen discharge port 14A and the plurality of mixed gas discharge ports 13A are located on the same plane A. [Selection diagram] Fig. 3

Description

  The present invention relates to a fusing crater, and more particularly, for fusing suitable for gas fusing using a combustible gas containing 18 vol% or more and 40 vol% or less of ethylene, the balance being hydrogen and unavoidable impurities. It relates to the crater.

Acetylene (C ₂ H ₂ ) is widely used as a combustion gas in gas fusing, gas welding and the like. Acetylene is excellent in burning rate and burning strength and is suitable as a combustion gas.

  However, acetylene may decompose and explode when stored and transported in the state of compressed gas. Therefore, acetylene is stored and transported in a dissolved gas state dissolved in a solvent such as acetone or dimethylformamide. As a result, acetylene has problems such as being unsuitable for mass transportation using a collection container or a large container.

  On the other hand, instead of acetylene, it has been proposed to use 38% by volume or more and 45% by volume or less of ethylene, with the balance being hydrogen and inevitable impurities as the combustion gas (for example, Patent Document 1). reference).

Japanese Patent No. 4848060

  The combustion characteristics of a mixed gas of hydrogen gas and ethylene gas (hereinafter referred to as “hydrogen-ethylene gas”) are different from those of acetylene conventionally used. For this reason, it is considered preferable to use a crater considering the combustion characteristics of “hydrogen-ethylene gas” for gas fusing using “hydrogen-ethylene gas”. Moreover, in the said patent document 1, when content of ethylene will be less than 38 volume%, since the problem of generation | occurrence | production of shoulder sagging and the adhesion amount of slag generate | occur | produces, content of ethylene shall be less than 38 volume%. Is not preferred. However, by using a crater suitable for “hydrogen-ethylene gas”, “hydrogen-ethylene gas” having an ethylene content of less than 38% by volume may be used for gas fusing.

  The present invention has been made to cope with such problems, and an object of the present invention is to provide a fusing crater suitable for use of “hydrogen-ethylene gas” as a combustion gas.

  A fusing crater according to the present invention heats a fusing part of a steel material by a flame formed by burning a combustible gas containing 18% by volume or more and 40% by volume or less of ethylene, with the balance being hydrogen and inevitable impurities. It is a fusing crater that blows off the steel material at the fusing part by blowing oxygen gas to the fusing part. The fusing crater includes an oxygen discharge port for discharging oxygen gas, and a plurality of mixed gas discharge ports that are disposed so as to surround the oxygen discharge port and discharge a mixed gas of combustible gas and oxygen gas. . The surface roughness of the inner wall surface of the oxygen discharge port is 1.4 μm or less in Ra, and the oxygen discharge port and the plurality of mixed gas discharge ports are located on the same plane.

  In gas fusing, by increasing the piercing speed of the steel material, not only can fusing be performed efficiently, but also the occurrence of shoulder sag and slag adhesion can be suppressed. The inventors have studied in detail the structure of a fusing crater that can increase the piercing speed of steel. As a result, the surface roughness of the inner wall surface of the oxygen discharge port is set to Ra of 1.4 μm or less, and the plurality of mixed gas discharge ports are disposed so as to surround the oxygen discharge port, and the oxygen discharge port and the plurality of mixed gases are disposed. It has been found that the piercing speed of the steel material can be increased by arranging the discharge port so as to be located on the same plane. The fusing crater of the present invention can increase the piercing speed of the steel material by adopting such a structure. As described above, according to the fusing crater of the present invention, it is suitable for the case where a combustible gas containing 18 volume% or more and 40 volume% or less of ethylene and the balance of hydrogen and inevitable impurities is used as a combustion gas. A fusing crater can be provided.

  The fusing crater may include an inner cylinder member and an outer cylinder member disposed so as to surround the inner cylinder member. An oxygen flow path that extends in the longitudinal direction and through which oxygen gas passes is formed in the central portion in the radial direction of the inner cylindrical member, and is formed between the inner peripheral surface of the outer cylindrical member and the outer peripheral surface of the inner cylindrical member. The region may extend in the longitudinal direction and be a mixed gas flow path for the mixed gas to pass through. The tip of the oxygen channel may be an oxygen discharge port, and the tip of the mixed gas channel may be a mixed gas discharge port.

  Further, in the fusing crater, the tip of the inner peripheral surface of the inner cylinder member constituting the wall surface surrounding the oxygen flow path, the tip of the outer peripheral surface of the inner cylinder member constituting the wall surface surrounding the mixed gas flow path, and the mixed gas The tip of the inner peripheral surface of the outer cylinder member constituting the wall surface surrounding the flow path may be located on the same plane.

  By adopting such a structure, the fusing crater of the present invention can be easily produced.

  In the fusing crater, the mixed gas channel may be bent at the tip so as to approach the oxygen channel. Accordingly, it is possible to provide a fusing crater that is more suitable when a combustible gas containing 18% by volume or more and 40% by volume or less of ethylene and the balance of hydrogen and inevitable impurities is used as the combustion gas.

  As is clear from the above description, according to the fusing crater of the present invention, a combustible gas containing 18 volume% or more and 40 volume% or less of ethylene, the balance being hydrogen and inevitable impurities is used as the combustion gas. A fusing crater suitable for the case can be provided.

It is a schematic side view which shows the structure of a crater. It is a schematic front view which shows the structure of a crater. It is a schematic sectional drawing of the crater along line segment III-III of FIG. It is a flowchart which shows the outline of the procedure of fusing.

  Hereinafter, an embodiment of the present invention will be described. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

  Referring to FIG. 1, crater 1, which is a fusing crater in the present embodiment, contains 18% by volume or more and 40% by volume or less of ethylene supplied from the rear end 20 side, with the balance being hydrogen and inevitable impurities. A flame can be formed by discharging a mixed gas of combustible gas and oxygen gas composed of the above from the tip 10 side and igniting the discharged mixed gas. With reference to FIGS. 2 and 3, the crater 1 includes an inner cylinder member 12 and an outer cylinder member 11 surrounding the inner cylinder member 12. As shown in FIG. 3, an oxygen channel 14 that extends in the longitudinal direction (front end 10 -rear end 20 direction) and through which oxygen gas passes is formed at the center of the inner cylinder member 12. The tip of the oxygen flow path 14 is an oxygen discharge port 14A for discharging oxygen gas.

  On the other hand, between the outer cylinder member 11 and the inner cylinder member 12, a gas mixture that extends in the longitudinal direction (front end 10-rear end 20 direction) and through which a mixed gas of the combustible gas and oxygen gas passes. A flow path 13 is formed. And the front-end | tip of the mixed gas flow path 13 becomes the mixed gas discharge port 13A which discharges mixed gas. A plurality of the mixed gas flow paths 13 are formed so as to surround the oxygen flow path 14 in a plane perpendicular to the longitudinal direction. As a result, as shown in FIG. 2, a plurality of mixed gas discharge ports 13A are arranged so as to surround the oxygen discharge port 14A when viewed from the end face side (front end side). As shown in FIG. 3, the oxygen discharge port 14 </ b> A and the plurality of mixed gas discharge ports 13 </ b> A are located on the same plane A. If it demonstrates from another viewpoint, the oxygen discharge port 14A which discharges oxygen gas is formed in the inner cylinder member 12, and between the inner cylinder member 12 and the outer cylinder member 11, several mixed gas discharge ports 13A are formed. Is formed. And the front-end | tip of the outer cylinder member 11 and the front-end | tip of the inner cylinder member 12 are located on the same plane A. FIG. More specifically, the inner peripheral surface of the inner cylindrical member 12 (inner wall surface of the oxygen discharge port 14A) 12C constituting the wall surface surrounding the oxygen flow path 14 and the wall surface surrounding the mixed gas flow path 13 are formed. The tip 12B of the outer peripheral surface of the cylindrical member 12 and the tip 11A of the inner peripheral surface of the outer cylindrical member 11 constituting the wall surface surrounding the mixed gas flow path 13 are located on the same plane A. Further, referring to FIG. 3, the mixed gas channel 13 is bent so as to approach the oxygen channel 14 at the tip. Further, the surface roughness of the inner wall surface 12C of the oxygen discharge port 14A is 1.4 μm or less in terms of Ra.

  Here, an example of the steel material fusing method using the crater 1 will be described. Referring to FIG. 4, first, a steel material is prepared (S11), and the steel material is in a state capable of being cut.

  Next, the crater 1 disposed at the tip of the torch is supplied with a mixed gas of combustible gas and oxygen gas containing 18% by volume or more and 40% by volume or less of ethylene with the balance being hydrogen and inevitable impurities. Then, a flame is formed by burning (S12). Specifically, referring to FIGS. 1 to 3, first, for example, a mixed gas of the combustible gas supplied from a cylinder and oxygen gas supplied from another cylinder passes through the mixed gas flow path 13. It is sent from the rear end 20 side to the front end 10 side. A flame is formed by igniting the mixed gas discharged from the mixed gas discharge port 13A.

  Next, the part (melting part) which should be cut | disconnected of the said steel materials is heated with the flame formed in step (S12) (S13). Thereafter, for example, oxygen gas (pure oxygen) supplied from a cylinder is sent from the rear end 20 side to the front end 10 side through the oxygen flow path 14. Then, oxygen gas discharged from the oxygen discharge port 14A is blown to the fusing part heated by the flame. Thereby, the steel material of the said melted part burns and melts. Furthermore, the molten steel material is removed by spraying oxygen gas discharged from the crater (S14).

  Then, by moving the torch along the portion of the steel material to be cut, the melting and removal of the steel material proceed sequentially. Thereby, cutting of steel materials is achieved (S15). By the above procedure, the melting of the steel material is completed. At this time, the piercing speed of the steel material can be increased by using the crater 1 in the present embodiment. Therefore, fusing can be performed efficiently. Moreover, by increasing the piercing speed of the steel material, it is possible to suppress adhesion of shoulder sag and slag at the cut portion. As a result, even ethylene-hydrogen gas having an ethylene content of less than 38% by volume can be used for fusing steel.

  A combustible gas containing 18 vol% or more and 40 vol% or less of ethylene with the balance being hydrogen and inevitable impurities was prepared, and an experiment was conducted to investigate the influence on the piercing time due to the difference in the structure of the crater. The experimental procedure is as follows.

  First, a steel material (JIS standard SS400) having a thickness of 9 mm was prepared. On the other hand, in addition to the conventional acetylene crater No. 3 and ethylene crater No. 3, the crater for fusing of the present invention (developed product) was prepared. The newly developed crater has the structure described in the above embodiment. In the ethylene crater, the surface roughness of the inner wall surface of the oxygen discharge port is set to 1.4 μm or less in Ra, and the inner cylinder member The structure is changed so that the tip and the tip of the outer cylinder member are located on the same plane. In other words, the ethylene crater basically has the same structure as the crater of the developed product, but the inner cylinder member is shorter than the outer cylinder member at the tip, and the outer cylinder member is closer to the tip than the inner cylinder member. It protrudes. The acetylene crater, on the other hand, has an acetylene that discharges acetylene, which is a combustion gas, in a plane perpendicular to the longitudinal direction, although the tip of the inner cylinder member and the tip of the outer cylinder member are located on the same plane as the developed product. The discharge port is different from the developed product in that it has an annular shape surrounding the oxygen discharge port for discharging oxygen gas.

  A piercing test of the steel material was performed using the crater, and the characteristics of the crater were evaluated based on the time until completion of the piercing. By shortening the piercing time, it is possible not only to efficiently cut the steel material, but also to suppress slag adhesion to the shoulder of the cut portion and the steel material. Details of the experimental conditions and the experimental results are shown in Table 1.

表１を参照して、開発品の火口を使用した場合、エチレンと水素との混合比にかかわらず、従来の火口を使用した場合に比べてピアッシング時間が短くなっている。このことから、開発品の火口は、１８体積％以上４０体積％以下のエチレンを含有し、残部が水素および不可避的不純物からなる可燃性ガスを用いた溶断に適した火口であることが確認される。

Referring to Table 1, when the developed crater is used, the piercing time is shorter than when a conventional crater is used regardless of the mixing ratio of ethylene and hydrogen. From this, it is confirmed that the crater of the developed product is a crater suitable for fusing using a combustible gas containing 18 volume% or more and 40 volume% or less of ethylene, and the balance being hydrogen and inevitable impurities. The

  It should be understood that the embodiments and examples disclosed herein are illustrative in all respects and are not restrictive in any respect. The scope of the present invention is defined not by the above description but by the scope of the utility model registration request, and is intended to include all modifications within the scope and meaning equivalent to the scope of the utility model registration request.

  The fusing crater of the present invention can be applied particularly advantageously to fusing using a combustible gas containing 18% by volume or more and 40% by volume or less of ethylene with the balance being hydrogen and inevitable impurities as the combustion gas.

  1 crater, 10 tip, 11 outer cylinder member, 11A tip of inner peripheral surface, 12 inner cylinder member, 12A tip of inner peripheral surface, 12B tip of outer peripheral surface, 12C inner wall surface, 13 mixed gas flow path, 13A mixed gas discharge Outlet, 14 oxygen flow path, 14A oxygen outlet, 20 rear end.

Claims (4)

  18% by volume to 40% by volume of ethylene is contained, and the remainder is heated by a flame formed by burning a combustible gas composed of hydrogen and inevitable impurities, and oxygen gas is blown onto the fusing part while heating the fusing part. A fusing crater for fusing the steel material at the fusing portion, and an oxygen discharge port for discharging oxygen gas, and a gas mixture of the combustible gas and oxygen gas, which is disposed so as to surround the oxygen discharge port A surface roughness of the inner wall surface of the oxygen discharge port is 1.4 μm or less, and the oxygen discharge port and the plurality of mixed gas discharge ports are A fusing crater located on the same plane.   An inner cylinder member and an outer cylinder member disposed so as to surround the inner cylinder member, and an oxygen flow for allowing oxygen gas to pass through the longitudinally central portion of the inner cylinder member. A path is formed, and a region between the inner peripheral surface of the outer cylinder member and the outer peripheral surface of the inner cylinder member extends in the longitudinal direction and becomes a mixed gas flow path for the mixed gas to pass therethrough. 2. The fusing crater according to claim 1, wherein a front end of the oxygen channel is the oxygen discharge port, and a front end of the mixed gas channel is the mixed gas discharge port.   Surrounding the front end of the inner peripheral surface of the inner cylinder member constituting the wall surface surrounding the oxygen flow path, the front end of the outer peripheral surface of the inner cylinder member constituting the wall surface surrounding the mixed gas flow path, and the mixed gas flow path The crater for fusing according to claim 2, wherein the tip of the inner peripheral surface of the outer cylinder member constituting the wall surface is located on the same plane. 4. The fusing crater according to claim 2, wherein the mixed gas flow path is bent so as to approach the oxygen flow path at a tip portion. 5.

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