High pressure high temperature preparation process of metal complex inner curved surface composite structure

Abstract

A kind of metal complex inner curved surface composite structure high pressure high temperature preparation process, including high-pressure pipeline, pressurizing device, heating device and preparation device, pressurizing device is made of overpressure bottle, compressor, filter, pressure gauge and check valve;Overpressure bottle and compressor, compressor and filter, overpressure bottle and sintering container are connected by high-pressure pipeline, pressure gauge and check valve are arranged on high-pressure pipeline;Heating device is made of temperature controller, current controller and furnace control and heater, furnace control and heater are connected with temperature controller and current controller by wire, furnace control and heater are connected with sintering container by high-temperature pipeline;Preparation device is made of metal powder container and sintering container, metal powder container left end is connected with filter, sintering container is connected with overpressure bottle, metal powder container and furnace control and heater by pipeline, metal powder is diffusion consolidated to obtain metal inner curved surface composite structure component by high pressure and high temperature.

Description

TECHNICAL FIELD

[0001] The application relates to the field of complex inner curved surface preparation, in particular to a high-pressure high-temperature preparation process for a metal complex inner curved surface composite structure. BACKGROUND

[0002] At present, all the downhole drilling tools such as full-metal motors have complex curved surfaces such as spiral curved surfaces and special-shaped curved surfaces, and the machining of the complex curved surfaces is mostly carried out by using cylindrical inner broaches, electrolytic corrosion machining and casting forming at home and abroad, but there are problems such as great machining control difficulty, low inner curved surface precision, difficult surface strengthening and short axial machining length. The high-pressure high-temperature preparation process for a metal complex inner curved surface composite structure is provided in the paper, and the complex inner curved surface such as a spiral inner curved surface is taken as an example. SUMMARY

[0003] In order to solve the problems of low inner curved surface precision, great machining difficulty of long parts and difficult inner curved surface strengthening in traditional machining, the high-pressure high-temperature preparation process for a metal complex inner curved surface composite structure is provided.

[0004] The high-pressure high-temperature preparation process for a metal complex inner curved surface composite structure is provided, and the following technical scheme is specifically adopted:

[0005] The high-pressure high-temperature preparation process for a metal complex inner curved surface composite structure comprises a pressurizing device, a heating device and a preparation device, and the pressurizing device, the heating device and the preparation device are connected by high-pressure resistant pipelines and high-temperature resistant pipelines, characterized in that the pressurizing device comprises an overpressure bottle, a compressor, a filter, a pressure gauge and a check valve, the overpressure bottle and the compressor are connected by a high-pressure resistant pipeline, the compressor and the filter are connected by a high-pressure resistant pipeline, the pressure gauge is arranged on the high-pressure resistant pipeline of the compressor and the filter, the overpressure bottle and a sintering container are connected by a high-pressure resistant pipeline, and the pressure gauge and the check valve are arranged on the pipeline.

[0006] The heating device comprises a temperature controller, a current controller and a furnace control and heater, the furnace control and heater are respectively connected with the temperature controller and the current controller through wires, and the furnace control and heater are connected with the sintering container by a high-temperature resistant pipeline; the preparation device comprises a metal powder container and a sintering container, the metal powder container is a cuboid container for containing metal powder, the left end of the metal powder container is connected with the filter, and the sintering container is connected with the overpressure bottle, the metal powder container and the furnace control and heater through pipelines.

[0007] The sintering container comprises a steel sleeve, a base layer sleeve, a metal powder cavity, a working layer spiral sleeve, a hard powder cavity, a spiral curved graphite mold, a powder injection port, an ultrahigh pressure interface, a fixing support and a high temperature connection port, the steel sleeve is a cylindrical tube body, the inner surface of the steel sleeve is in contact with the outer surface of the base layer sleeve; the working layer spiral sleeve is a spiral body, the shape of the spiral body is designed according to the spiral body to be processed, and the cavity formed by the combination of the base layer sleeve and the working layer spiral sleeve is a metal powder cavity; the spiral curved graphite mold is designed according to the spiral body to be processed, and the cavity formed by the combination of the working layer spiral sleeve and the spiral curved graphite mold is a hard powder cavity; the whole sintering container is fixed on the fixing support.

[0008] The outer surface of the working layer spiral sleeve is a spiral surface, and the inner surface combined with the spiral curved graphite mold is also a spiral surface.

[0009] One end of the spiral curved graphite mold is a protruding cylinder, which is matched with one end of the steel sleeve with two annular cavities; the two annular cavities of the steel sleeve are located on one side of the end face of the steel sleeve, and are symmetrical with the center of the end face as the center line, and one annular cavity of the steel sleeve is located on the other side of the end face and on the center of the end face.

[0010] The metal powder container is a sealed container, the inside is a cavity, one side of the bottom of the container is provided with a connecting hole, the connecting hole is provided with a threaded hole, and the threaded hole is used for connecting with a compressor; the other side of the upper part is provided with a connecting hole, and the connecting hole is provided with a threaded hole, and the threaded hole is used for connecting with a furnace control and a heater.

[0011] The outer surface of the metal powder cavity is a base layer sleeve cylindrical inner tube surface, the inner surface is a working layer spiral sleeve outer spiral surface, and the two sides of the metal powder cavity chamber are connected with the annular cavities of the steel sleeve; the outer surface of the hard powder cavity is a working layer spiral sleeve cylindrical inner tube surface, the inner surface is a spiral curved graphite mold outer spiral surface, and the two sides of the hard powder cavity chamber are connected with the annular cavities of the steel sleeve.

[0012] In summary, the present application has at least one of the following beneficial technical effects:

[0013] 1. The graphite mold is designed by an inner spiral curved surface, the inner spiral curved surface is converted into an outer spiral surface of graphite, the processing is easier, and a complex metal inner spiral curved surface part can be prepared;

[0014] 2. High pressure and high temperature metal powder sintering is adopted, a heat treatment and tempering process for improving the texture of steel in the traditional process is saved, the site and heating equipment are saved, and the economic benefit is higher.

[0015] 3. Under the action of high temperature and high pressure, the dense working layer is obtained by using powder atom diffusion connection, and then the base layer is filled with different metal powders to sinter the base layer again, so as to form a composite structure, realize the inner surface strengthening of the inner helical surface, and solve the problem that the helical inner surface is difficult to be strengthened by traditional processing. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a three-dimensional frame diagram of the high-pressure and high-temperature preparation process of the metal complex inner curved surface composite structure in the embodiment;

[0017] Figure 2 is a flow chart of the high-pressure and high-temperature preparation process of the metal complex inner curved surface composite structure in the embodiment;

[0018] Figure 3 is a schematic diagram of the assembly of the helical mold, the cover and the steel sleeve;

[0019] Figure 4 is a cross-sectional schematic diagram of the axial position of the helical mold, the cover and the steel sleeve;

[0020] Figure 5 is a cross-sectional schematic diagram of the radial position of the helical mold, the cover and the steel sleeve;

[0021] Figure 6 is a schematic diagram of the working layer cover structure in the preparation process;

[0022] Figure 7 is a schematic diagram of the graphite helical mold structure in the preparation process;

[0023] BRIEF DESCRIPTION OF DRAWINGS

[0024] 1. Overpressure bottle; 2. Compressor; 3. Filter; 4. Pressure gauge; 5. Metal powder container; 6. One-way valve; 7. Sintering container; 701. Steel sleeve; 702. Base layer cover; 703. Metal powder cavity; 704. Working layer helical cover; 705. Hard powder cavity; 706. Helical curved surface graphite mold; 707. Powder injection port; 708. Ultra-high pressure interface; 709. Fixed support; 710. High-temperature connection port; 8. Temperature controller; 9. Current controller; 10. Furnace control and heater. DETAILED DESCRIPTION

[0025] The following will be described in detail in combination with the accompanying drawings Figures 1-7 The application is further described in detail.

[0026] The application discloses a high-pressure and high-temperature preparation process of a metal complex inner curved surface composite structure. Referring to Figure 1 , Figure 3 and Figure 5The metal complex inner curved surface composite structure high pressure high temperature preparation process is composed of a pressurizing device, a heating device and a preparation device, and the pressurizing device, the heating device and the preparation device are connected by high-pressure resistant pipelines and high-temperature resistant pipelines. The pressurizing device is composed of an overpressure bottle 1, a compressor 2, a filter 3, a pressure gauge 4 and a one-way valve 6. The overpressure bottle 1 and the compressor 2 are connected by a high-pressure resistant pipeline, the compressor 2 and the filter 3 are connected by a high-pressure resistant pipeline, the pressure gauge 4 is arranged on the high-pressure resistant pipeline of the compressor 2 and the filter 3, and the overpressure bottle 1 and a sintering container 7 are connected by a high-pressure resistant pipeline, and the pressure gauge 4 and the one-way valve 6 are arranged on the pipeline. The heating device is composed of a temperature controller 8, a current controller 9 and a furnace control and heater 10. The furnace control and heater 10 are respectively connected with the temperature controller 8 and the current controller 9 by wires, and the furnace control and heater 10 and the sintering container 7 are connected by a high-temperature resistant pipeline.

[0027] The preparation device is composed of a metal powder container 5 and the sintering container 7. The metal powder container 5 is a cuboid container for containing metal powder, and the left end is connected with the filter 3. The sintering container 7 is connected with the overpressure bottle 1, the metal powder container 5 and the furnace control and heater 10 by pipelines. The sintering container 7 is composed of a steel sleeve 701, a base layer sleeve 702, a metal powder cavity 703, a working layer spiral sleeve 704, a hard powder cavity 705, a spiral curved surface graphite mold 706, a powder injection port 707, an ultrahigh pressure interface 708, a fixing support 709 and a high-temperature connection port 710. The steel sleeve 701 is a cylindrical pipe body, and the inner surface of the steel sleeve 701 is in contact with the outer surface of the base layer sleeve 702. The working layer spiral sleeve 704 is a spiral body, and the shape of the spiral body is designed according to the spiral body to be processed. The cavity formed by the combination of the base layer sleeve 702 and the working layer spiral sleeve 704 is the metal powder cavity 703. The spiral curved surface graphite mold 706 is designed according to the spiral body to be processed, and the cavity formed by the combination of the working layer spiral sleeve 704 and the spiral curved surface graphite mold 706 is the hard powder cavity 705. The whole sintering container 7 is fixed on the fixing support 709.

[0028] Reference Figure 4 and Figure 5, the sintering container 7 comprises a steel sleeve 701, a base layer sleeve 702, a metal powder cavity 703, a working layer spiral sleeve 704, a hard powder cavity 705, a spiral curved graphite mold 706, a powder injection port 707, an ultra-high pressure interface 708, a fixed support 709 and a high temperature connection port 710, the steel sleeve 701 is a cylindrical tube body, the inner surface of the steel sleeve 701 is in contact with the outer surface of the base layer sleeve 702; the working layer spiral sleeve 704 is a spiral body, the spiral body is designed according to the spiral body to be processed, and the cavity formed by the combination of the base layer sleeve 702 and the working layer spiral sleeve 704 is the metal powder cavity 703; the spiral curved graphite mold 706 is designed according to the spiral body to be processed, and the cavity formed by the combination of the working layer spiral sleeve 704 and the spiral curved graphite mold 706 is the hard powder cavity 705, and the entire sintering container 7 is fixed on the fixed support 709.

[0029] Referring to Figure 3 , Figure 5 and Figure 6 , the outer surface of the working layer spiral sleeve 704 is a spiral surface, and the inner surface combined with the spiral curved graphite mold 706 is also a spiral surface; the spiral curved graphite mold 706 is a spiral body, and the outer surface is a spiral surface; one end of the spiral curved graphite mold 706 is a protruding cylinder, which cooperates with one end of the steel sleeve 701 with two annular cavities; the two annular cavities of the steel sleeve 701 are located on one side of the end face of the steel sleeve 701, and are symmetrical with the center of the end face as the center line, and one annular cavity of the steel sleeve 701 is located on the other side of the end face of the steel sleeve 701 and is located on the center of the end face.

[0030] The outer surface of the metal powder cavity 703 is the cylindrical inner barrel surface of the base layer sleeve 702, the inner surface is the outer spiral surface of the working layer spiral sleeve 704, and the chambers on both sides of the metal powder cavity 703 are connected with the annular cavities of the steel sleeve 701; the outer surface of the hard powder cavity 705 is the cylindrical inner barrel surface of the working layer spiral sleeve 704, the inner surface is the outer spiral surface of the spiral curved graphite mold 706, and the chambers on both sides of the hard powder cavity 705 are connected with the annular cavities of the steel sleeve 701.

[0031] Working principle:

[0032] The metal complex inner curved surface composite structure high pressure high temperature preparation process works, first, on the ground, the components of the preparation process are assembled, specifically: the connecting pipeline of the overpressure bottle 1 is two branches, one branch connects the compressor 2, and the other branch connects the sintering container 7; the working layer spiral sleeve 704 is installed on the spiral curved surface graphite mold 706 in a rotating manner, and then installed in the base layer sleeve 702, and the base layer sleeve 702 is installed in the steel sleeve 701; the pipeline at the other end of the compressor 2 passes through the filter 3, and then connects the metal powder container 5; the other end of the metal powder container 5 is connected to the sintering container 7 through a high-pressure resistant pipeline, and the other end of the sintering container 7 is connected to the furnace control and heater 10 through a high-pressure resistant pipeline; the furnace control and heater 10 are connected to the temperature controller 8 and the current controller 9 through wires.

[0033] Referring to Figure 2 After the above installation work is completed, first, the metal powder in the metal powder container 5 is filled into the hard powder cavity 705 in the sintering container 7 through the overpressure bottle 1 and the compressor 2, high-pressure gas is introduced to uniformly act on the spiral curved surface graphite mold 706 and the working layer spiral sleeve 704, and at the same time, the temperature controller 8 and the current controller 9 are adjusted to control the furnace control and heater 10 to heat so that the temperature in the sintering container 7 rises until the powder is densified and solidified, and after maintaining for a period of time, the temperature is slowly lowered to obtain a dense working layer.

[0034] Then, another kind of metal powder is filled into the metal powder container 5, and then the metal powder in the metal powder container 5 is filled into the metal powder cavity 703 in the sintering container 7 through the overpressure bottle 1 and the compressor 2, and high-pressure gas is introduced to uniformly act on the metal powder cavity 703, and at the same time, the temperature controller 8 and the current controller 9 are adjusted to control the furnace control and heater 10 to heat so that the temperature in the sintering container 7 rises until the metal powder in the metal powder cavity 703 is again densified and solidified, and after maintaining for a period of time, the temperature is slowly lowered to obtain a dense base layer, thereby obtaining a metal inner curved surface composite structure component.

[0035] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made on the basis of the structure, shape, principle of the present application should be covered by the protection scope of the present application.

Claims

1. A high pressure high temperature preparation process of a metal complex inner curved surface composite structure, comprising a pressurizing device, a heating device and a preparation device, wherein the pressurizing device, the heating device and the preparation device are connected by high-pressure resistant pipes and high-temperature resistant pipes, characterized in that, The pressurizing device is composed of an overpressure bottle (1), a compressor (2), a filter (3), a pressure gauge (4) and a one-way valve (6); the overpressure bottle (1) and the compressor (2) are connected by high-pressure pipelines, the compressor (2) and the filter (3) are connected by high-pressure pipelines, the high-pressure pipelines of the compressor (2) and the filter (3) are provided with the pressure gauge (4), the overpressure bottle (1) and a sintering container (7) are connected by high-pressure pipelines, and the pipelines are provided with the pressure gauge (4) and the one-way valve (6); the heating device is composed of a temperature controller (8), a current controller (9) and a furnace control and heater (10), the furnace control and heater (10) is connected with the temperature controller (8) and the current controller (9) by wires respectively, and the furnace control and heater (10) and the sintering container (7) are connected by high-temperature pipelines; the preparation device is composed of a metal powder container (5) and the sintering container (7), the metal powder container (5) is a cuboid container for containing metal powder, and the left end is connected with the filter (3), and the sintering container (7) is connected with the overpressure bottle (1), the metal powder container (5) and the furnace control and heater (10) by pipelines respectively; The sintering container (7) comprises a steel sleeve (701), a base layer sleeve (702), a metal powder cavity (703), a working layer spiral sleeve (704), a hard powder cavity (705), a spiral curved surface graphite mold (706), a powder injection port (707), an ultrahigh pressure interface (708), a fixing support (709) and a high-temperature connection port (710), the steel sleeve (701) is a cylindrical pipe body, and the inner surface of the steel sleeve (701) is in contact with the outer surface of the base layer sleeve (702); the working layer spiral sleeve (704) is a spiral body, the spiral body is adapted to the spiral body to be processed, and the cavity formed by the combination of the base layer sleeve (702) is the metal powder cavity (703); the spiral curved surface graphite mold (706) is adapted to the spiral body to be processed, and the cavity formed by the combination of the working layer spiral sleeve (704) is the hard powder cavity (705), and the whole sintering container (7) is fixed on the fixing support (709); The outer surface of the working layer spiral sleeve (704) is a spiral surface, and the inner surface combined with the spiral curved surface graphite mold (706) is also a spiral surface; the spiral curved surface graphite mold (706) is a spiral body, and the outer surface is a spiral surface; The metal powder in the metal powder container (5) is filled into the hard powder cavity (705) in the sintering container (7) through the overpressure bottle (1) and the compressor (2), high pressure gas is introduced to uniformly act on the spiral curved graphite mold (706) and the working layer spiral sheath (704), the temperature controller (8) and the current controller (9) are adjusted, the furnace control and the heater (10) are heated to make the temperature in the sintering container (7) rise until the powder is densified and solidified, the temperature is slowly lowered after being kept for a period of time, and the dense working layer is obtained; another kind of metal powder is filled into the metal powder container (5), the metal powder in the metal powder container (5) is filled into the metal powder cavity (703) in the sintering container (7) through the overpressure bottle (1) and the compressor (2), high pressure gas is introduced to uniformly act on the metal powder cavity (703), the temperature controller (8) and the current controller (9) are adjusted, the furnace control and the heater (10) are heated to make the temperature in the sintering container (7) rise until the metal powder in the metal powder cavity (703) is densified and solidified again, the temperature is slowly lowered after being kept for a period of time, and the dense substrate layer is obtained, and the metal inner curved surface composite structure part is obtained.

2. The metal complex inner curved surface composite structure high pressure high temperature preparation process according to claim 1, characterized in that: The spiral curved graphite mold (706) has a protruding cylinder at one end, which cooperates with one end of the steel sleeve (701) provided with two annular cavities; the two annular cavities of the steel sleeve (701) are located on one side of the end face of the steel sleeve (701) and are symmetrical about the center line of the center of the two end faces, and one annular cavity of the steel sleeve (701) is located on the other side of the end face of the steel sleeve (701) and is located on the center of the end face.

3. The process for high pressure high temperature fabrication of metal complex inner curved surface composite structure according to claim 1, characterized in that: The metal powder container (5) is a sealed container with a cavity inside, a connecting hole is arranged on one side of the bottom of the container, threads are processed on the connecting hole, and the connecting hole is used for being connected with the compressor (2); a connecting hole is arranged on the other side of the upper portion, threads are processed on the connecting hole, and the connecting hole is used for being connected with the furnace control and the heater (10).

4. The process for high pressure high temperature fabrication of metal complex inner curved surface composite structure according to claim 1, characterized in that: The outer surface of the metal powder cavity (703) is a cylindrical inner barrel surface of the substrate layer sheath (702), the inner surface is an outer spiral surface of the working layer spiral sheath (704), and the two sides of the cavity of the metal powder cavity (703) are connected with the annular cavities of the steel sleeve (701); the outer surface of the hard powder cavity (705) is a cylindrical inner barrel surface of the working layer spiral sheath (704), the inner surface is an outer spiral surface of the spiral curved graphite mold (706), and the two sides of the cavity of the hard powder cavity (705) are connected with the annular cavities of the steel sleeve (701). The outer surface of the metal powder cavity (703) is a cylindrical inner barrel surface of the substrate layer sheath (702), the inner surface is an outer spiral surface of the working layer spiral sheath (704), and the two sides of the cavity of the metal powder cavity (703) are connected with the annular cavities of the steel sleeve (701); the outer surface of the hard powder cavity (705) is a cylindrical inner barrel surface of the working layer spiral sheath (704), the inner surface is an outer spiral surface of the spiral curved graphite mold (706), and the two sides of the cavity of the hard powder cavity (705) are connected with the annular cavities of the steel sleeve (701).

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