The method of surface treatment products and device for its implementation

 

(57) Abstract:

The invention relates to a surface treatment before coating, as well as for polishing, grinding or create a rough surface and its hardening. Supplied to the mixing chamber fluid spray stream spray gas component of the centrifugal nozzle with internal mixing, which has two satirically camera with tangential channels for liquid inlet and the spray gas. Formed vortex gas-liquid stream is accelerated in the flow of the working gas is the energy source in a supersonic nozzle, cooled together with the expanding gas in a supersonic nozzle to form abrasive particles in the form of crystallized drops of liquid. Emerging from the nozzle multicomponent stream, consisting of gas drops and zakristallizuetsya droplets of liquid is directed onto the surface of the product. The invention improves the efficiency and productivity of the process. 2 C. and 7 C.p. f-crystals. 2 Il.

The invention relates to the field of surface treatment products, in particular, before coating the gas-dynamic, thermal, plasma and other methods, as well as for the subsequent obrabotkata on the surface and hardening of the latter.

A known method of surface treatment products, providing for the establishment of roughness on the surface in the form of a network of sharp protrusions and recesses of a depth of not less than 600 microns by electrochemical or chemical etching [1].

The disadvantages of the method are its limited technological capabilities, the complexity of the process and poor performance on environmental requirements related to the use of various chemicals for etching.

There is also known a method of surface treatment of parts used for the production and recovery of metal products with thermal spray coatings in mechanical engineering, which provides for surface plastic deformation blasting method balls of high-strength steel and blasting the surface of the oxide [2].

The disadvantages of this method are: the complexity of the process, limited technological capabilities, has a rather small resource of the spray devices.

There is a method of blasting the surface of products, providing a spray of fluid flow sputtering gas, a dispersion liquid in which th [3].

The disadvantages of this method are the low efficiency of the process and limitations in application.

A known method of surface treatment products, which involves the formation of a high-speed liquid jet, mixing it with high-speed flow of carrier gas, the acceleration of the mixture in a supersonic nozzle and the subsequent impact of the flow on the surface [4].

To implement this method is known device containing the site of formation of gas-liquid flow, comprising a source of a gas stream, reservoir, sorter particle dispenser particles, a container of liquid (fluid) environment, two accelerator, made in the form of accelerating supersonic nozzles, one of which is connected to a node for supplying the working gas is the energy source and installed in the mixing chamber of the main spreader nozzle in its subsonic part [4].

The above-described method and device are the closest analogues of the proposed invention.

The disadvantages of this method and device are limited technological and functional capabilities, low resource work accelerating system, lack of effectiveness rabadaba and devices is to expand the technology and functionality of the surface treatment in combination with environmentally friendly process to increase the efficiency of the treatment process, to simplify the design and increase the service life of the accelerating system.

The invention consists in that in the method of surface treatment products, including the formation of liquid jets, mixing it with a high-speed flow of the working gas-the energy, the acceleration of the mixture in a supersonic nozzle and its subsequent impact on the treated surface, according to the invention provides for the formation of a liquid jet by dispersion liquid spray gas using two centrifugal nozzles with internal mixing before the formation of gas-liquid-suspension and acceleration in the supersonic nozzle carried out with the formation in gas-liquid-suspension of the crystallized drops of liquid. The accelerated gas-liquid suspension in the flow of the working gas is the energy source is carried out at a gas pressure of Pg>310 n/m2and gas flow rate M>1, where M is the Mach number. The impact on the workpiece surface is performed by the jet containing a suspension fluid and crystallized liquid droplets in the gas or slurry of the crystallized drops of liquid in gas. As the fluid used and the working carrier gas using air, nitrogen or carbon dioxide, and mixtures thereof.

For the formation of gas-liquid flow device containing the site of formation of gas-liquid flow, the accelerator gas-liquid flow with the mixing chamber and communicates with it accelerating supersonic nozzle, provided with two end manifolds, one of which is located on the cut accelerating supersonic nozzle and connected (or has) with pipe supply fluid, and the other placed at the end of the mixing chamber, and the site of formation of gas-liquid flow is made in the form of coaxially installed in the mixing chamber of a two-component centrifugal nozzles with internal mixing, which has two satirically camera, one with a pipe and has at least one tangential channel to enter the spray gas, and the other is made of at least one tangential channel for input of liquid and placed in a face manifold of the mixing chamber. The mixing chamber and accelerating supersonic nozzle are made with double walls and have the channels for the supply of the fluid, communicating among themselves and with end headers.

The invention is illustrated in Fig. 1 and 2, where Fig. 1 presents a General view of the device for the realization of the Yes of the working fluid at the end of the manifold 2, located on the cut accelerating supersonic nozzle 3 having double walls that have 4 channels for supplying the working fluid into the mixing chamber 5 with double walls and a channel for supplying a working fluid. In the mixing chamber 5 at its front side, opposite to the accelerating supersonic nozzle mounted coaxially two centrifugal nozzle 6 with internal mixing with the deflector 7, pipe 8 for supplying the spray gas in Sovietology chamber 9 with tangential channel 10 input sputtering gas, the end manifold 11 for supplying the working fluid in Sovietology the camera 12 with tangential channel 13 input working fluid. Saariselka the camera 12 is placed in face of the collector 11, which is reported through the mixing chamber and nozzle with the nozzle 1 of the input fluid. The mixing chamber has a pipe 14 with tangential channel 15 input working gas is the energy source.

The described method and device are as follows.

Working gas is the energy source under pressure to the nozzle 14 through a tangential channel 15 serves in the cavity formed by the housing of the mixing chamber 5, the deflector 7 and the wall of the nozzle 6. Ramacieri mixing 5. The twisted flow of working gas through the annular gap along the walls of the mixing chamber 5 is necessary to eliminate the formation, a thin liquid film on the inner surface of the chamber and the input of the subsonic part of the accelerating supersonic nozzle 3, and the dispersion of the working fluid. The so formed vortex gas flow is accelerated in a supersonic nozzle 3. Upon reaching the desired parameters of the gas flow of energy in the nozzle 3 produce feed spray gas in the nozzle 6 to the nozzle 8, and in the end collector 11 of the mixing chamber 5 by means of channels 4 supply of the working fluid located in the walls of the nozzle and the mixing chamber, serves the working fluid. Spray gas in the tangential channel 10 located tangentially to the inner wall of the nozzle 6, comes into its cavity, forming a gas vortex flowing into the mixing chamber 5. The working fluid under pressure from the reservoir 2 through the channels 4 supply, made in the walls of the nozzle and mixing chamber, enters the collector 11, which is tangential to the channel 13 expires in the cavity zavihriteljami camera 12 nozzles 6, forming a vortex flow of the fluid generated in the form of a tapered film at the outlet of satirical dispersion of the latter. The liquid film breaks up into droplets, forming a suspension in the gas volume of the mixing chamber 5. Working gas is the energy source in the form of a vortex flow picks up gas-liquid suspension, there is a mixing of two-phase ow with a working gas-the energy and the acceleration of this mixture in accelerating supersonic nozzle 3. In the nozzle when the expansion of the gas to decrease the static temperature Tarticle<150 K, which ensures crystallization of fine liquid droplets in a joint acceleration flow carrying their gas. When the impact of this flow on the surface is carried out, depending on the specified mode, the gas flow of energy and material, various kinds of processing: cleaning, hardening, polishing or erosion processing, in particular the establishment of the roughness (surface) before coating.

Flowing from the nozzle the flow of suspension depending on the selected options expiration in accelerating supersonic nozzle may contain a mixture of gas and solid crystallized drops of liquid that perform the function of the abrasive particles, or a mixture of gas with liquid drops with crystallized drops of the latter.

When dispergirovany is the root, together with the working gas is the energy source can be carried out at the speed of a gas-energy determined by the Mach number, M > 1.

As a working gas energy use any gas or mixture of gases, in particular air, nitrogen, carbon dioxide.

As the spray gas use the same gases, or mixtures thereof.

As the working fluid use water, and if necessary, the aqueous solutions of substances that alter the crystallization temperature of the latter. The pressure of the gas when accelerating gas-liquid mixture set Pg>3105n/m2.

Method and device simple in its technical essence, provide a wide range of technological and functional capabilities of the process of blasting the surface, allow to increase the productivity and efficiency of the process in combination with environmentally friendly, reduce costs and increase the service life of the spray system, and to simplify the process and device for its implementation. The method and apparatus can also be used individually during the finishing operations of grinding and polishing and for surface cleaning products from contamination (such as buildings), scale or other types of finishing works.

Sources of information the 1975.

4. M. H. WO N95/23673, class B 24 C 5/04, 1995.

1. The method of surface treatment products, including the formation of liquid jets, mixing it with high-speed flow of carrier gas, the acceleration of the mixture in a supersonic nozzle and its subsequent impact on the workpiece surface, characterized in that the formation of gas-liquid stream is carried out by dispersion liquid spray gas component of the centrifugal nozzle with internal mixing before the formation of gas-liquid-suspension and acceleration in the supersonic nozzle carried out with the formation in gas-liquid-suspension of the crystallized drops of liquid.

2. The method according to p. 1, characterized in that the acceleration of the gas-liquid suspension in the flow of the working gas is the energy source is carried out at a gas pressure of Pr> 3 105n/m2and gas flow rate M > 1, where M is the Mach number.

3. The method according to p. 1 or 2, characterized in that the impact on the workpiece surface is performed by the stream containing a mixture of gas, liquid and crystallized drops of liquid.

4. The method according to p. 1 or 2, characterized in that the impact on the workpiece surface is performed by the jet stargasm, as liquid use water.

6. The method according to any of paragraphs.1 to 4, characterized in that the liquid used aqueous solutions of substances that alter the crystallization temperature of the latter.

7. The method according to any of paragraphs.1 - 6, characterized in that as the spray gas using air, nitrogen, carbon dioxide or mixtures thereof.

8. The method according to any of paragraphs.1 - 6, characterized in that the working gas-energy use air, nitrogen, carbon dioxide or mixture of gases.

9. Device for surface treatment of products containing the site of formation of gas-liquid flow, the accelerator gas-liquid flow from the mixing chamber and communicating with it accelerating supersonic nozzle, characterized in that it is provided with two end manifolds, one of which is located on a section of a supersonic nozzle has a nozzle inlet fluid and the other placed at the end of the mixing chamber, and the site of formation of gas-liquid flow is made in the form of coaxially installed in the mixing chamber of a two-component centrifugal nozzles with internal mixing, which has two satirically camera, one with a pipe and has at least oginal to enter the liquid and placed in the end collector mixing chamber, moreover, the mixing chamber and supersonic nozzle are made with double walls and have channels for supplying a fluid, interconnected and mechanical collectors.

 

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