WO2016149978A1

WO2016149978A1 - Novel cutting torch and processing method thereof

Info

Publication number: WO2016149978A1
Application number: PCT/CN2015/077266
Authority: WO
Inventors: 于庆先; 徐磊
Original assignee: 于庆先
Priority date: 2015-03-24
Filing date: 2015-04-23
Publication date: 2016-09-29
Also published as: CN104801817A

Abstract

Disclosed are a novel cutting torch and a processing method thereof. The cutting torch is prepared by employing a metal powder injection moulding method, which has the advantages that stainless steel gas cutting torches can be conveniently produced in mass quantities on the premise that functions of the gas cutting torch are ensured. Mechanical processing, such as casting, turning, milling, drilling and other processes and devices can be substantially eliminated. A high-pressure oxygen channel structure is arranged inside. A tube seat (11) is arranged on an inner tube (1). An air inlet end of the inner tube (1) and the tube seat (11) have a taper that matches a cutting machine in the axial direction, which facilitates processing. Since the stainless steel is resistant to high temperature, it is difficult to deform, long in service life, and low in comprehensive costs.

Description

Novel cutting nozzle and processing method thereof

Technical field

The invention relates to a novel cutting nozzle and a processing method thereof.

Background technique

Gas cutting nozzles are mainly divided into machine cutting nozzles and hand cutting nozzles. At present, they are widely used in metal cutting in the industry. All copper materials are mechanically processed to produce, through casting, car, cutting, drilling and attacking. The thread is processed by dozens of steps, the advantage of this method is that the copper material is soft and easy to form; the disadvantage is that the process is complicated, the equipment used is high in cost, and the material utilization rate is low. The three parts of the final cutting nozzle are fastened together. During the use of the cutting nozzle, the slag is more likely to block the nozzle. The material of the traditional cutting nozzle makes the cutting nozzle easily deform at high temperature, and only the cutting nozzle can be replaced. Therefore, the amount of copper gas cutting nozzles in the country is about 500 million a year, which is produced in dozens of factories. The amount used in the world is about 2 billion per year, which consumes a large amount of copper. Although the temperature resistance of stainless steel is nearly 500 ° C higher than that of copper, stainless steel has high hardness and is difficult to machine, so the processing cost is high.

Summary of the invention

In view of the deficiencies of the prior art, the present invention designs a novel gas cutting nozzle comprising an inner tube and an outer casing, wherein the inner tube is provided with a cutting oxygen passage, and the inner tube and the outer casing are assembled to form a mixed gas between the inner tube and the outer casing. The channel has a wing structure on the outside of the inner tube, and the inside of the outer casing has a sinking groove and a rib structure. The inner tube has a high-pressure oxygen passage structure inside, and the inner tube is provided with a tube seat, and the tube seat and the inner tube are integrally provided. The inner tube and the tube seat are provided with a conical sealing surface.

A novel gas cutting nozzle comprises an inner tube and an outer casing, wherein the inner tube is provided with a cutting oxygen passage, and the inner tube and the outer casing are assembled to form a mixed gas passage between the inner tube and the outer casing, and the outer tube has a wing structure outside, and the outer casing The utility model has a sinking groove and a rib structure, wherein the inner tube has a high-pressure oxygen passage structure, the inner tube and the tube seat are arranged in two parts, and the inner tube and the tube seat are provided with a conical sealing surface.

Preferably, the inner tube is located on the same conical surface as the conical sealing surface on the stem, and one or two sealing surfaces are provided on the stem.

Preferably, the inner tube is provided with a circular protrusion, and the inside of the tube seat is provided with a groove matching the circular protrusion.

Optimizedly, the shape of the tube seat is a trapezoidal table, a square table, and a curved table.

Preferably, the axial mating surface of the socket and the corresponding axial matching surface of the sinking groove in the outer casing are tapered together.

Optimizedly, the cutting oxygen passage inside the inner tube consists of a tapered section and a parallel section.

Optimized, the processing method of the new cutting nozzle includes the following steps:

(1) mold design, including a mold in which the tube seat and the inner tube are integrated, and a mold in which the tube seat is separated from the inner tube;

(2) selecting stainless steel water atomization or aerosolized powder;

(3) The stainless steel powder and the binder are uniformly mixed according to the volume ratio, and the mixture is prepared by mixing, extruding and granulating;

(4) According to the size and structure of the gas cutting nozzle specified by the standard, the mold for injection molding is prepared. The requirement for preparing the mold size is based on the shrinkage rate after the blanking of the blank, and the feeding is injected into the mold by the injection molding machine, and the mold is opened. After taking out, it is a blank;

(5) removing the binder in the product by liquid soaking or heating decomposition;

(6) The product after removing the binder is subjected to high-temperature sintering densification to obtain a sintered product;

(7) After the sintered product is subjected to various post-treatments as needed, the tube seat and the inner tube are fixed together, and the inner tube and the tube seat are ground by a conical sealing surface, and after the grinding is completed, the inner tube and the tube seat are The outer tubes are assembled to complete the processing of the cutting nozzle.

Optimizedly, the stainless steel structure is austenitic, the models include 304 and 303, and the particle size is less than 40 microns.

Preferably, the stainless steel powder and the binder are mixed in a volume ratio of from 1 to 0.5:1.5.

Preferably, the binder comprises two or more compositions of polyethylene, polypropylene, EVA, polyvinyl alcohol, polymethyl methacrylate, stearic acid, polyethylene, and paraffin.

Preferably, the sintering temperature is from 1100 ° C to 1600 ° C.

Optimizedly, the density of the article is between 95% and 98% of the density of the stainless steel.

The invention designs a novel gas cutting nozzle and adopts a metal powder injection molding method, and has the advantages that the stainless steel gas cutting nozzle can be conveniently mass-produced under the premise of ensuring the function of the gas cutting nozzle, and almost no mechanical processing is required. Such as casting, car, cutting, drilling and other processes and equipment. Due to the high temperature resistance of stainless steel, it is not easy to be deformed, the service life is greatly extended, and the comprehensive cost is greatly reduced.

The invention adopts austenite as a material. Since the austenite does not have magnetism, the iron filings are not easily adsorbed on the cutting nozzle during cutting, which effectively ensures the normal use of the cutting nozzle, does not cause clogging, and prolongs the service life of the cutting nozzle.

The invention adopts stainless steel water mist pulverization to make stainless steel into a powder of less than 40 micrometers, and is prepared by mixing with a binder to form granules, metal is injection molded into a desired shape, and then degreased, vacuum high temperature heating forming, sealing surface Grinding to produce a gas cutting nozzle. The invention uses stainless steel instead of copper to prepare a gas cutting nozzle, which is suitable for mass production, the cost is basically the same as that of the copper cutting nozzle, and saves a large amount of copper resources; at the same time, since the method basically does not need cutting, a large amount of metal processing equipment and manpower are saved. Since the life of stainless steel cutting nozzle is about 10 times that of copper cutting nozzle, the overall cost is only about one tenth of that of copper cutting nozzle, and it also saves a lot of use cost, such as frequent replacement of machine cutting nozzle. The impact on production, etc. Therefore, the invention will have a subversive change in the traditional manufacturing method of the gas cutting nozzle, which will generate enormous economic and social benefits.

The inner tube of the invention has a high-pressure oxygen channel structure, the inner tube is provided with a tube seat, the tube seat and the inner tube are integrally arranged, the inner tube and the tube seat are provided with a conical sealing surface, and the high-pressure channel is designed to improve the cutting strength. The tube seat and the inner tube are integrally arranged to facilitate the grinding of the subsequent tapered sealing surface, the installation of the tube seat and the inner tube is reduced, the working efficiency is improved, and the taper design makes the cutting nozzle and the machine more conformable, and the sealing performance is improved. , high stability.

The invention has a high-pressure oxygen channel structure inside, and the inner tube is provided with a pipe seat. The axial direction of the inner pipe inlet end and the pipe seat axial direction are provided with a taper matched with the cutting machine, and the high-pressure channel is designed to improve the cutting strength and the pipe socket It is separated from the inner tube and is easy to manufacture and manufacture. The taper design makes the cutting nozzle and the machine more harmonious, and the sealing performance is improved and the stability is high.

The axial matching surface of the inner tube of the invention and the axial matching surface of the tube seat are on the same conical surface, thereby ensuring the accuracy and precision of the cooperation.

The tube seat of the invention is provided with one or two sealing faces. When a sealing surface is provided, the cutting nozzle is suitable for hand cutting, and when two sealing faces are provided, it is suitable for machine cutting, and has wide application range and high practicability.

The inner tube of the invention is provided with a circular protrusion, and the inside of the tube seat is provided with a groove matched with the circular protrusion, so that the assembly and fixation of the tube seat and the inner tube are convenient, and the stability after fixation is strong, and the processing of the cutting mouth is convenient. Improve the accuracy of processing.

The tube seat of the invention is detachable, and the cutting nozzle can be separately manufactured during the manufacturing process, which is convenient for manufacturing and saves production cost.

The shape of the tube seat of the invention has a trapezoidal table, a square table and a curved table, which can adapt to the needs of different working properties, and select different tube seat shapes, which are suitable for hand cutting and machine cutting.

The axial matching surface of the pipe socket of the invention and the corresponding axial matching surface of the sinking groove in the outer casing adopt a taper fit, and the cooperation is more compact, and the working effect is stable.

The cutting oxygen passage inside the inner tube of the invention consists of a tapered section and a parallel section, which increases the oxygen throughput and improves the cutting efficiency.

The invention has the beneficial effects that the taper taper installed in cooperation with the cutting machine is disposed on the inner tube, and only the inner tube is fixed during processing, and then the inner tube is cut, thereby effectively ensuring the inner tube and the wing table cutting surface At the same level, and the processing method is simple without cumbersome processing procedures.

DRAWINGS

Figure 1 is a schematic view showing the structure of a novel cutting nozzle for a machine according to the present invention;

2 is a schematic structural view of an inner tube of a novel cutting nozzle of the present invention;

Figure 3 is a schematic view showing the structure of the outer casing of the novel cutting nozzle of the present invention;

4 is a schematic structural view of a socket of a novel cutting nozzle for a machine according to the present invention;

Fig. 5 is a schematic view showing the structure of a novel hand cutting nozzle of the present invention.

1-inner tube; 2-inner tube conical sealing surface; 3-tube seat conical sealing surface; 4-shell; 5-ribbed table; 6-sinking groove; 7-round projection; 8-mixing gas passage; 9-cut oxygen channel; 10-wing structure; 11-tube holder; 12-high pressure oxygen channel.

detailed description

The invention will be specifically described below in conjunction with the drawings and embodiments.

Example 1:

The technical solution of the present invention is: a novel gas cutting nozzle comprising an inner tube 1 and a casing 4, the inner tube 1 is internally provided with a cutting oxygen passage 9, and the inner tube 1 and the outer casing 4 are assembled between the inner tube 1 and the outer casing 4 Forming a mixed gas passage 8, the outer tube 1 has a wing structure 10 on the outside, the outer casing 4 has a sinking groove 6 and a rib 5 structure, the inner tube 1 has a high-pressure oxygen passage 12 structure therein, and the inner tube 1 is provided with a socket 11 The tube seat 11 and the inner tube 1 are integrally provided, and the inner tube 1 and the tube seat 11 are provided with a conical sealing surface, and the conical sealing surface of the inner tube is located on the same tapered surface as the conical sealing surface 3 of the tube seat, and the inner tube 1 is provided There is a circular protrusion 7, and the inside of the tube seat 11 is provided with a groove matching with the circular protrusion 7. The tube seat 11 has a trapezoidal table, a square table, an arc table, and an axial matching surface of the tube seat 7 and corresponding The axial matching surfaces of the sinking grooves 6 in the outer casing 4 are tapered with each other, and the cutting oxygen passage 9 inside the inner tube 1 is composed of a tapered section and a parallel section. The processing method of the novel cutting nozzle includes the following steps: (1) mold design , including a mold integrated with the inner tube and the inner tube to separate the mold from the inner tube; (2) selecting stainless steel water atomization or aerosolizing powder; (3) no The rust steel powder and the binder are uniformly mixed according to the volume ratio, and are mixed and extruded to form a feed; (4) The mold for injection molding is prepared according to the size and structure of the gas cutting nozzle specified by the standard, and the mold size is prepared. The requirement is that the feeding is injected into the mold by injection molding machine according to the shrinkage rate after the blanking of the blank, and the blank is taken out after the mold is taken out; (5) the blank is removed by liquid immersion or thermal decomposition. (6) The product after removing the binder is subjected to high-temperature sintering densification to obtain a sintered product; (7) the sintered product is subjected to various post-treatments as needed, and the stem and the inner tube are fixed together, and the inner tube is fixed Grinding the conical sealing surface with the tube seat. After the grinding is completed, the inner tube, the tube seat and the outer tube are assembled together to complete the processing of the cutting nozzle. The stainless steel structure is austenite, the model number is 304, and the particle size is smaller than 40 micron, the stainless steel powder and the binder are mixed in a volume ratio of 1:1.5, the binder is composed of polyethylene, polypropylene, EVA, the sintering temperature is 1100 ° C, and the density of the product reaches 95% of the density of the stainless steel.

Example 2:

The difference between this embodiment and the embodiment 1 is that the austenite model number of the embodiment is 303.

Example 3:

The difference between this embodiment and the embodiment 1 is that the stainless steel powder and the binder of the embodiment are in accordance with the body of 0.5:1.5. The product ratio is mixed.

Example 4:

The difference between this embodiment and the embodiment 1 is that the binder of the embodiment consists of polyethylene and paraffin.

Example 5:

The difference between this embodiment and Example 1 is that the sintering temperature of this embodiment is 1600 °C.

Example 6

The difference between this embodiment and the embodiment 1 is that the product density of the present embodiment reaches 98% of the density of the stainless steel.

Example 7

The difference between this embodiment and the embodiment 1 is that the shape of the stem of the embodiment is set to a square table.

Example 8

The difference between this embodiment and the embodiment 1 is that the shape of the stem of the embodiment is set as an arc-shaped table.

Example 9

The difference between this embodiment and the embodiments 1-8 is that the inner tube and the tube seat of the embodiment are provided in two parts.

The described embodiments are a part of the embodiments of the invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts, the austenitic models have the same technical effects in the 3 series, and other models in the 3 series are austenitic. The body is within the scope of protection of the present invention.

Claims

A novel gas cutting nozzle comprises an inner tube and an outer casing, wherein the inner tube is provided with a cutting oxygen passage, and the inner tube and the outer casing are assembled to form a mixed gas passage between the inner tube and the outer casing, and the outer tube has a wing structure outside, and the outer casing The utility model has a sinking groove and a rib structure, wherein the inner pipe has a high-pressure oxygen passage structure, the inner pipe is provided with a pipe seat, the pipe seat and the inner pipe are integrally provided, and the inner pipe and the pipe seat are provided with a conical sealing surface. .
A novel gas cutting nozzle comprises an inner tube and an outer casing, wherein the inner tube is provided with a cutting oxygen passage, and the inner tube and the outer casing are assembled to form a mixed gas passage between the inner tube and the outer casing, and the outer tube has a wing structure outside, and the outer casing The utility model has a sinking groove and a rib structure, wherein the inner tube has a high-pressure oxygen passage structure, the inner tube and the tube seat are arranged in two parts, and the inner tube and the tube seat are provided with a conical sealing surface.
A novel gas cutting nozzle according to claim 1 or 2, wherein the inner tube and the conical sealing surface on the stem are located on the same tapered surface, and the sealing surface of the stem is provided with one or two.
A novel gas cutting nozzle according to claim 2, wherein the inner tube is provided with a circular protrusion, and the inside of the tube seat is provided with a groove which cooperates with the circular protrusion.
A novel gas cutting nozzle according to claim 1 or 2, wherein the tube seat has a trapezoidal table, a square table, and a curved table.
A novel gas cutting nozzle according to claim 1 or 2, wherein the axial mating faces of the stems and the corresponding axially mating faces of the corresponding recesses in the outer casing are tapered together.
A novel gas cutting nozzle according to claim 1 or 2, wherein the cutting oxygen passage inside the inner tube is composed of a tapered section and a parallel section.
The processing method of the novel cutting nozzle includes the following steps:

(1) mold design, including molds for each component;

(2) selecting stainless steel water atomization or aerosolized powder;

(3) The stainless steel powder and the binder are uniformly mixed according to the volume ratio, and the mixture is prepared by mixing, extruding and granulating;

(4) According to the size and structure of the gas cutting nozzle specified by the standard, the mold for injection molding is prepared. The requirement for preparing the mold size is based on the shrinkage rate after the blanking of the blank, and the feeding is injected into the mold by the injection molding machine, and the mold is opened. After taking out, it is a blank;

(5) removing the binder in the product by liquid soaking or heating decomposition;

(6) The product after removing the binder is subjected to high-temperature sintering densification to obtain a sintered product;

(7) After the sintered product is subjected to various post-treatments as needed, the tube seat and the inner tube are fixed together, and the inner tube and the tube seat are fixed. Grinding of the conical sealing surface, after the grinding is completed, the inner tube, the tube seat and the outer tube are assembled together to complete the processing of the cutting nozzle.
The method of manufacturing a gas cutting nozzle according to claim 8, wherein the stainless steel has an austenite structure, the type includes 304 and 303, the particle diameter is less than 40 μm, and the stainless steel powder and the binder are in a range of 1 to 0.5: 1.5. The volume ratio is mixed, and the binder includes two or more compositions of polyethylene, polypropylene, EVA, polyvinyl alcohol, polymethyl methacrylate, stearic acid, polyethylene, and paraffin.
The method of producing a gas torch according to claim 8, wherein the sintering temperature is from 1100 ° C to 1600 ° C, and the density of the product is from 95% to 98% of the density of the stainless steel.