CN115781197A - Diffusion connection tool and diffusion connection method for rocket engine nozzle - Google Patents
Diffusion connection tool and diffusion connection method for rocket engine nozzle Download PDFInfo
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- CN115781197A CN115781197A CN202211619331.4A CN202211619331A CN115781197A CN 115781197 A CN115781197 A CN 115781197A CN 202211619331 A CN202211619331 A CN 202211619331A CN 115781197 A CN115781197 A CN 115781197A
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Abstract
The invention provides a diffusion connection tool and a diffusion connection method for a rocket engine nozzle, and belongs to the field of welding tools. The tool solves the problems of large tool design difficulty, long processing period and high cost in the traditional mechanical loading process mode of the existing double-layer spray pipe structure manufacturing, has sealing performance, and can bear the gas pressure of 2MPa at 900 ℃. And placing the products to be welded in the tool, and realizing diffusion connection of the products to be welded by sealing the high-pressure environment in the tool. The invention provides a diffusion bonding tool which has sealing performance, can bear gas pressure of 2MPa at 900 ℃, places a product to be bonded in the tool, and can realize diffusion bonding of the product to be bonded by sealing a high-pressure environment in the tool.
Description
Technical Field
The invention belongs to the field of welding tools, and particularly relates to a diffusion connection tool and a diffusion connection method for a rocket engine nozzle.
Background
The rocket engine jet pipe is a device for accelerating airflow by changing the geometric shape of the inner wall of a pipe section, controls the gas flow by the size of the throat area of the jet pipe, enables the gas in a combustion chamber to keep a preset pressure, and is an important part for the capacity conversion of the rocket engine.
The double-layer spray pipe structure of the rocket engine mainly comprises two types, wherein one type is a copper steel structure spray pipe with the inner wall made of heat conducting materials and the outer wall made of strength materials, and the other type is a double-layer spray pipe structure which adopts TA15 titanium alloy materials and is used for reducing the quality of the engine and improving the thrust-weight ratio. Particularly, with the vigorous development of commercial aerospace, the demand of the jet pipe is remarkably increased, but the current units for matching are not enough.
In order to realize the diffusion connection of the inner wall and the outer wall, the traditional method is to design an inner wall expanding type tool, and diffusion bonding force is provided through the combined action of the outward normal expanding force of the tool and the inward tightening force of the outer wall tool. The method needs to strictly control the machining dimensional tolerance of the tool, the outer wall needs to reserve a larger wall thickness, the molded surface of the tool needs to be changed along with the change of the spray pipes with different structures, and therefore the tool needs to be put into the tool again, the tool cost is higher, the machining period is longer, and the cost is high.
Disclosure of Invention
In view of the above, the invention aims to provide a rocket engine nozzle diffusion connection tool and a diffusion connection method, so as to solve the problems of large tool design difficulty, long processing period and high cost in the traditional mechanical loading process mode of the existing double-layer nozzle structure manufacturing, and the tool has sealing property and can bear the gas pressure of 2MPa at 900 ℃. And placing the products to be welded in the tool, and realizing diffusion connection of the products to be welded by sealing the high-pressure environment in the tool.
In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a rocket engine spray tube diffusion bonding frock, its places in the furnace chamber of vacuum diffusion bonding equipment, should connect the frock and include upper cover plate, jar body and inflation system, the upper cover plate is installed to the top of jar body, and the part of treating the welding is placed at jar internal, still pass through breather pipe Shen Rulu intracavity when inflation system is connected with jar body.
Furthermore, a sealing structure is arranged between the upper cover plate and the tank body.
Furthermore, the sealing structure is made of a titanium alloy plate.
Furthermore, the thickness of the titanium alloy plate is 1-2mm.
Furthermore, a temperature measuring hole is arranged at the bottom of the tank body and used for placing a temperature sensor probe.
Further, the gas charging system is an argon bottle.
Furthermore, the tank body is made of 304 stainless steel or cast steel Cr25N i 20。
A diffusion bonding method using a rocket engine nozzle diffusion bonding tool specifically comprises the following steps:
(1) Processing a raw material forging stock by a numerical control processing method, wherein a flow channel on the outer side of the inner wall of the forging stock is processed in place according to the drawing requirement, a 1-2mm allowance is reserved on the inner side of the inner wall, an inner profile of the outer wall is processed in place, a 1-2mm allowance is reserved on the outer profile, process allowances are reserved at the upper end and the lower end of the inner wall and the outer wall, and a circumferential weld locking bottom structure is designed for subsequent electron beam welding;
(2) Plating a nickel layer with the thickness of 0.08-0.12mm on the diffusion surfaces of the inner wall and the outer wall in a chemical plating mode;
(3) Assembling the inner wall and the outer wall in place, and completing vacuumizing of an inner flow passage and circular seam lock bottom sealing welding of the edge of the part by the assembled part in an electron beam welding mode;
(4) Placing the sealed parts into a diffusion bonding tool, placing the diffusion bonding tool in a furnace chamber of vacuum diffusion bonding equipment, compacting an upper cover plate, and vacuumizing the furnace chamber to 10 DEG -4 After Pa, the tank body is heated to 900-980 ℃, argon is filled into the tank body, and the pressure in the tank body reaches 1.5 -3 The MPa lasts for 2-6h, and the diffusion connection of the copper steel structure spray pipe is realized;
(5) And then stopping pressurizing, keeping the vacuum state in the tank body, cooling along with the furnace, and taking out the spray pipe to finish the product diffusion connection.
Compared with the prior art, the rocket engine nozzle diffusion bonding tool and the rocket engine nozzle diffusion bonding method have the beneficial effects that:
(1) The invention provides a high-temperature-resistant and high-pressure-resistant sealing tool, which realizes the diffusion connection of inner and outer wall structures of a nozzle in the tool by loading high-pressure argon in the tool, and solves the problems of high tool design difficulty, long processing period and high cost in the traditional mechanical loading process mode of manufacturing a double-layer nozzle structure.
(2) The invention provides a diffusion bonding tool which has sealing performance, can bear gas pressure of 2MPa at 900 ℃, places a product to be bonded in the tool, and can realize diffusion bonding of the product to be bonded by sealing a high-pressure environment in the tool.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of a product with a double-layer nozzle structure;
FIG. 2 is a schematic structural view of a rocket engine nozzle diffusion bonding tool according to the present invention;
FIG. 3 is an enlarged view of a portion of the rocket engine nozzle diffusion bonding tooling of the present invention;
in the figure: 1-an upper cover plate, 2-a tank body, 3-an argon bottle, 4-a first air inlet, 5-a second air inlet, 6-a furnace chamber and 7-a sealing structure.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely explained below with reference to the drawings in the embodiments of the present invention. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict, and the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments.
1. First embodiment, referring to fig. 2 to 3, the embodiment will be described, and a rocket engine nozzle diffusion bonding tool is placed in a furnace chamber 6 of a vacuum diffusion bonding apparatus, and includes an upper cover plate 1, a tank body 2 and an inflation system, wherein the upper cover plate 1 is installed above the tank body 2, a part to be welded is placed in the tank body 2, and the inflation system is connected with the tank body 2 and extends into the furnace chamber 6 through a vent pipe. The gas charging system is an argon bottle 3.
And a sealing structure is arranged between the upper cover plate 1 and the tank body 2.
The bottom of the tank body 2 is provided with a temperature measuring hole for placing a temperature sensor probe.
The tank body 2 is made of 304 stainless steel or cast steel Cr25N i 20, high temperature resistance and high pressure resistance.
Taking the structure shown in fig. 1 as an example, the inner wall of the double-layer spray pipe structure is made of copper, the outer wall of the double-layer spray pipe structure is made of steel materials, the inner wall of the double-layer spray pipe structure is uniformly distributed with groove-shaped flow channels, the upper part and the lower part of the outer wall are respectively provided with an annular flow channel, and after the contact surfaces of the inner wall and the outer wall are connected in a diffusion mode, an integral flow channel system can be formed between the inner wall and the outer wall.
The invention designs a diffusion bonding tool, as shown in fig. 2. The tool main body structure is composed of an upper cover plate 1 and a tank body 2, a sealing stem 7 is arranged between the upper cover plate 1 and the tank body 2, a vent pipe is connected to the tank body 2, and the vent pipe is connected with an argon bottle 3. When the tool is used, a product to be welded is placed in the tank body 2 in advance, the whole tank body 2 is placed in a furnace chamber 6 of vacuum diffusion connection equipment, a titanium alloy plate with the thickness of 1-2mm is padded between the upper cover plate 1 and the tank body 2 to serve as a sealing material, boron nitride is coated on the plate and the tank body 2, and the upper cover plate 1 is pressed downwards through an upper pressing head of the equipment to realize sealing in the tank body 2.
The breather pipe of the tank body 2 is connected with an inflation system (argon gas bottle 3), the argon gas bottle 3 is connected with the air inlet pipe in the furnace chamber 6 through a three-way valve, namely the argon gas bottle 3 is connected with two air inlet pipes, one is connected with the tank body 2, and the other is stretched into the furnace chamber 6. The three-way valve is opened, and when the equipment furnace chamber 6 is vacuumized, the tank body 2 can also be vacuumized; when the three-way valve is closed, argon can be filled into the tank body 2 through the argon bottle.
The tool with the structure can be repeatedly utilized, and is suitable for diffusion connection of double-layer structure spray pipes with various structures and profiles. By adjusting the pressure intensity of the argon inside and the thickness allowance of the spray pipe wall, the deformation of the internal groove-shaped flow passage is within 0.1mm while the diffusion connection quality is ensured.
The invention relates to a diffusion bonding tool and a diffusion bonding method, which are suitable for diffusion bonding of a double-layer structure spray pipe with an inner wall made of pure copper material and an outer wall made of S-06 steel; and diffusion connection of the TA15 titanium alloy double-layer structure spray pipe.
The diffusion bonding method of the diffusion bonding tool specifically comprises the following steps:
1. the forging stock of the raw material is processed by a numerical control processing method, a flow channel on the outer side of the inner wall is processed in place according to the requirement of a drawing, and a margin of 1-2mm is reserved on the inner side of the inner wall. The inner profile of the outer wall is processed in place, 1-2mm of allowance is left on the outer profile, and process allowance is left on the upper end and the lower end of the inner wall and the outer wall, so that a circumferential weld seam locking bottom structure is designed for subsequent electron beam welding.
2. Plating 0.08-0.12mm nickel layer on the diffusion surface of the inner and outer walls by chemical plating.
3. And assembling the inner wall and the outer wall in place, and performing vacuumizing of an inner flow channel and circular seam lock bottom sealing welding of the edge of the part on the assembled part in an electron beam welding mode.
4. Placing the sealed and welded parts into a diffusion connection tool, placing the diffusion connection tool into a furnace chamber 6 of vacuum diffusion welding equipment, compacting an upper cover plate 1, and vacuumizing the furnace chamber 6 to 10 -4 And after Pa, heating the tank body 2 to 900-980 ℃, starting to fill argon into the tank body 2, and maintaining the pressure in the tank body 2 to 1.5-3MPa for 2-6h to realize the diffusion connection of the copper-steel structure spray pipe. And then stopping pressurizing, keeping the vacuum state in the tank body 2, cooling along with the furnace, and taking out the spray pipe to finish the product diffusion connection.
The embodiments of the invention disclosed above are intended merely to aid in the explanation of the invention. The examples are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention.
Claims (9)
1. The utility model provides a rocket engine spray tube diffusion bonding frock which characterized in that: the welding fixture is arranged in a furnace chamber (6) of vacuum diffusion welding equipment, and comprises an upper cover plate (1), a tank body (2) and an inflation system, wherein the upper cover plate (1) is installed above the tank body (2), parts to be welded are placed in the tank body (2), and the inflation system is connected with the tank body (2) and extends into the furnace chamber (6) through a vent pipe.
2. The rocket engine nozzle diffusion bonding tool of claim 1, wherein: a sealing structure is arranged between the upper cover plate (1) and the tank body (2).
3. The rocket engine nozzle diffusion bonding tool of claim 2, wherein: the sealing structure is made of a titanium alloy plate.
4. A rocket engine nozzle diffusion bonding tool according to claim 3, characterized in that: the thickness of the titanium alloy plate is 1-2mm.
5. The rocket engine nozzle diffusion bonding tool of claim 1, wherein: the bottom of the tank body (2) is provided with a temperature measuring hole for placing a temperature sensor probe.
6. The rocket engine nozzle diffusion bonding tool of claim 1, wherein: the gas charging system is an argon bottle (3).
7. The rocket engine nozzle diffusion bonding tool of claim 1, wherein: the tank body (2) is made of 304 stainless steel or cast steel Cr25N i 20。
8. A diffusion bonding method using a rocket engine nozzle diffusion bonding tool as recited in any one of claims 1-7, characterized in that: the method specifically comprises the following steps:
(1) Processing a raw material forging stock by a numerical control processing method, wherein a flow channel on the outer side of the inner wall of the forging stock is processed in place according to the requirement of a drawing, a 1-2mm allowance is reserved on the inner side of the inner wall, an inner profile of the outer wall is processed in place, a 1-2mm allowance is reserved on the outer profile, process allowances are reserved on the upper end and the lower end of the inner wall and the outer wall, and a circumferential weld bottom locking structure is designed for subsequent electron beam welding;
(2) Plating a nickel layer with the thickness of 0.08-0.12mm on the diffusion surfaces of the inner wall and the outer wall in a chemical plating mode;
(3) Assembling the inner wall and the outer wall in place, and completing vacuumizing of an inner flow passage and circular seam lock bottom sealing welding of the edge of the part by the assembled part in an electron beam welding mode;
(4) Placing the sealed and welded parts into a diffusion connection tool, placing the diffusion connection tool into a furnace chamber 6 of vacuum diffusion welding equipment, compacting an upper cover plate 1, vacuumizing the furnace chamber 6, heating a tank body 2, then starting to fill argon into the tank body 2, and ensuring that the pressure in the tank body 2 reaches 1.5 -3 The MPa lasts for 2-6h, and the diffusion connection of the copper steel structure spray pipe is realized;
(5) And then stopping pressurizing, keeping the vacuum state in the tank body 2, cooling along with the furnace, and then taking out the spray pipe to finish the product diffusion connection.
9. A diffusion bonding method of a rocket engine nozzle diffusion bonding tool as recited in claim 5, wherein: in the step (4), the furnace chamber (6) is vacuumized to 10 DEG -4 After Pa, the tank body (2) is heated to 900-980 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211619331.4A CN115781197A (en) | 2022-12-15 | 2022-12-15 | Diffusion connection tool and diffusion connection method for rocket engine nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211619331.4A CN115781197A (en) | 2022-12-15 | 2022-12-15 | Diffusion connection tool and diffusion connection method for rocket engine nozzle |
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| Publication Number | Publication Date |
|---|---|
| CN115781197A true CN115781197A (en) | 2023-03-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211619331.4A Pending CN115781197A (en) | 2022-12-15 | 2022-12-15 | Diffusion connection tool and diffusion connection method for rocket engine nozzle |
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| CN (1) | CN115781197A (en) |
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- 2022-12-15 CN CN202211619331.4A patent/CN115781197A/en active Pending
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