CN111112952A - Integral forming process for pipe seat of boiler header - Google Patents
Integral forming process for pipe seat of boiler header Download PDFInfo
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- CN111112952A CN111112952A CN201911396544.3A CN201911396544A CN111112952A CN 111112952 A CN111112952 A CN 111112952A CN 201911396544 A CN201911396544 A CN 201911396544A CN 111112952 A CN111112952 A CN 111112952A
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- tube
- seat
- inner diameter
- diameter line
- tube seat
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
Abstract
The invention discloses an integral forming process of a boiler header pipe seat, which comprises the following steps: A) scribing an inner diameter line of a tube hole, an inner diameter line and an outer diameter line of a tube seat and a tube seat manufacturing range line on a tube body; B) processing a pipe hole on the cylinder according to an inner diameter line; C) integrally manufacturing and molding the tube seat on the tube body by adopting a 3D printing mode for the metal printing material according to the inner diameter line, the outer diameter line and the manufacturing range line of the tube seat, wherein the tube seat comprises a tube body of the tube seat and a root reinforcing transition section; D) carrying out 100% nondestructive inspection on the whole tube seat; E) heat treatment is carried out after the pipe seat is integrally formed; the invention has the advantages of small early preparation workload, high automation degree, low labor intensity and high processing efficiency, and can improve the working environment and improve the stability and reliability of the product quality.
Description
Technical Field
The invention relates to a forming process of a boiler header pipe seat.
Background
The header is an important pressure-bearing part of a power station boiler, a plurality of tube seats with the diameter of phi 100 mm-phi 355.6mm and the wall thickness of 10-75 mm are arranged on a cylinder body of the header, and the tube seats are usually machined into tube seats by adopting forgings or seamless steel tubes and then connected to a header cylinder body in a welding mode; as shown in figure 1, because the welding groove is a saddle-shaped groove, the saddle drop of the welding line is large, the cross sections of the shoulder welding line 5 and the abdomen welding line 6 are greatly different, the welding filling amount is extremely uneven, the welding bead arrangement difficulty is large, the welding line forming control requirement is high, and the welding difficulty is large. Therefore, manual or semi-automatic welding operation modes such as 'manual argon tungsten-arc welding assembly point, bottoming + manual electric arc welding filling cover surface' or 'manual argon tungsten-arc welding assembly point, bottoming + manual electric arc welding transition + gas shielded welding filling and cover surface' are usually adopted, so that the method not only has the advantages of more preliminary preparation work, low automation degree, high labor intensity, low efficiency and poor welding environment, but also ensures the quality of the welding completely depending on the operation level and responsibility of a welder, and is difficult to ensure the stability and reliability of the product quality.
Disclosure of Invention
The invention aims to provide an integral forming process of a boiler header pipe seat, aiming at the defects in the prior art, and the integral forming process has the advantages of small early preparation workload, high automation degree, low labor intensity and high processing efficiency, and can improve the operating environment and improve the stability and reliability of product quality.
In order to achieve the aim, the invention discloses an integral forming process of a boiler header pipe seat, which is characterized by comprising the following steps of: A) scribing an inner diameter line of a tube hole, an inner diameter line and an outer diameter line of a tube seat and a tube seat manufacturing range line on a tube body; B) processing a pipe hole on the cylinder according to an inner diameter line; C) integrally manufacturing and molding the tube seat on the tube body by adopting a 3D printing mode for the metal printing material according to the inner diameter line, the outer diameter line and the manufacturing range line of the tube seat, wherein the tube seat comprises a tube body of the tube seat and a root reinforcing transition section; D) carrying out 100% nondestructive inspection on the whole tube seat; E) heat treatment is carried out after the pipe seat is integrally formed;
the invention makes the tube seats integrally formed by scribing and 3D printing, saves a plurality of processes of tube seat preparation in the earlier stage, reduces the occupation of numerical control machine processing equipment, applies advanced 3D printing (additive manufacturing) technology, is favorable for realizing the intellectualization and automation of production and manufacture of the tube seats of products such as a boiler header and the like, is particularly suitable for manufacturing the tube seats which are inclined in a non-radial direction, a non-orthogonal direction and the like on a cylinder body and special tube seats with less quantity and materials, has low labor intensity and high processing efficiency, can improve the working environment and improve the stability and reliability of the product quality;
as a further improvement of the invention, in the step A), the diameter d of the inner diameter line of the tube hole of the scribed barrel body is the value obtained by subtracting 2b from the diameter of the inner diameter line of the tube seat, the value of b is 0-5 mm, and the diameters of the inner diameter line of the scribed barrel body and the inner diameter line of the scribed tube hole are both smaller than the designed inner diameters d1 of the tube seat and the tube hole; after the step C, machining allowance of the inner diameter of the tube seat of the tube body and the inner diameter of the tube hole is removed, so that the inner diameters of the tube seat and the tube hole reach the designed inner diameter d 1; when the quality of the inner surface of the pipe seat and the joint of the pipe seat and the barrel body is difficult to meet the requirements of design and manufacturing standards, the quality can be improved and the coaxiality of the pipe seat and the pipe hole can be ensured by machining;
as a further improvement of the invention, the metal printing material is metal alloy powder or metal alloy wire, and the material and the performance of the metal printing material are the same as or similar to those of the cylinder; the bonding strength after 3D printing can be ensured;
as a further improvement of the invention, the nondestructive inspection of the step D is one or the combination of more than two of magnetic powder inspection, penetration inspection or ultrasonic flaw detection;
as a further improvement of the invention, the heat treatment in the step E is a whole heat treatment or a local heat treatment, and during the local heat treatment, the heating and heat-preserving region should include the whole tube seat and the header cylinder body within the range of at least 200mm on both sides of the tube seat; all can meet the requirements;
in conclusion, the invention has the advantages of small early preparation workload, high automation degree, low labor intensity and high processing efficiency, and can improve the working environment and the stability and reliability of product quality.
Drawings
Fig. 1 is a schematic view of a welding structure of a conventional header.
FIG. 2 is a front view of a header using an embodiment of the present invention.
Fig. 3 is a left side view of fig. 2.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Taking a certain project as an example, as shown in fig. 2 and 3, the boiler header cylinder 1 is made of 12Cr1MoVG with the specification of phi 363 × 50, and the cylinder 1 is arranged with a tube seat 2 made of 12Cr1MoVG with the specification of phi 216 × 35; the pipe seat 2 is orthogonal to the header cylinder 1, the pipe seat 2 axially passes through the center of the header cylinder 1, and the distance between the axis of the pipe seat 2 and the diameter center line of the cylinder 1 is 0 mm; the included angle between the axis of the tube seat 2 and the axis of the tube body 1 is 0 degree; the included angle between the axis of the tube seat 2 and the diameter central line of the tube body 1 is 0 degree; the integral forming process of the boiler header pipe seat of the embodiment comprises the following steps of: A) scribing an inner diameter line of a tube hole 3, an inner diameter line of a tube seat 2, an outer diameter line d2 and a tube seat manufacturing range line d3 on a tube body 1, wherein the diameters of the inner diameter line of the tube hole 3 and the inner diameter line of the tube seat 2 are both d, and the diameters d of the inner diameter line of the tube hole 3 and the inner diameter line of the tube seat 2 are smaller than the designed inner diameters d1 of the tube seat 2 and the tube hole 3; B) processing a pipe hole 3 on the cylinder 1 according to an inner diameter line d; C) the method comprises the following steps of integrally manufacturing and molding a tube seat 2 on a barrel body 1 by adopting a 3D printing mode according to an inner diameter line, an outer diameter line and a manufacturing range line of the tube seat 2, wherein the tube seat 2 comprises a tube seat barrel body with an outer diameter of D2 and an inner diameter of D and a root reinforcing transition section with a diameter of D3, and the 3D printing process is to melt metal alloy powder or metal alloy wire materials with the same material and performance and then weld the metal alloy powder or metal alloy wire materials on the barrel body 1; D) machining allowance of the inner diameter of the pipe seat 2 and the inner diameter of the pipe hole 3 is removed, so that the inner diameters of the pipe seat 2 and the pipe hole 3 reach the designed inner diameter d 1; E) performing 100% nondestructive inspection on the whole tube seat 2, wherein the nondestructive inspection is one or a combination of more than two of magnetic powder inspection, penetration inspection or ultrasonic inspection; E) the heat treatment can be carried out after the pipe seat 2 is integrally formed, the integral heat treatment or the local heat treatment can be carried out, when the local heat treatment is carried out, the heating and heat preservation area comprises the whole pipe seat 2 and the header cylinder body in the range of at least 200mm at two sides of the pipe seat 2, and the temperature and the heat preservation time are determined according to the material and the size of a workpiece;
according to the invention, the tube seats 2 are integrally manufactured and formed by scribing and 3D printing, so that a plurality of processes of tube seat preparation in the earlier stage are omitted, the occupation of numerical control machine processing equipment is reduced, and the advanced 3D printing (additive manufacturing) technology is applied, so that the production and the manufacture of the tube seats of products such as a boiler header and the like are intelligentized and automated, the labor intensity is low, the processing efficiency is high, the operating environment is improved, and the stability and the reliability of the product quality are improved; the quality of the inner surface of the tube seat 2 and the joint of the tube seat 2 and the tube body 1 can meet the requirements of design and manufacturing standards, the quality can be improved through machining, and the coaxiality of the tube seat 2 and the tube hole 3 can be ensured; the material and performance of the metal printing material are the same as or similar to those of the cylinder body 1, so that the bonding strength after 3D printing can be ensured;
the invention is not limited to the above embodiment, for example, the diameter of the inner diameter line of the pipe hole 3 can be slightly smaller than that of the inner diameter line of the pipe seat 2, which is convenient for improving the quality of the joint of the pipe seat 2 and the barrel 1; when the quality of the inner surface of the tube seat 2 and the joint of the tube seat 2 and the tube body 1 meets the requirements of design and manufacturing standards, the inner diameter of the tube hole 3 and the inner diameter of the tube seat 2 are designed inner diameters d1 of the tube seat 2 and the tube hole 3 when the lines are drawn; the invention is suitable for the header pipe seat with the pipe seat 2 obliquely intersected with the header cylinder 1, the axial direction of the pipe seat eccentric with the center of the header cylinder, the axial line of the pipe seat eccentric with the diameter center line of the cylinder, and the axial line of the pipe seat forming a certain included angle with the axial line of the cylinder and the axial line of the pipe seat with the diameter center line of the cylinder, and has more outstanding advantages compared with the traditional process.
Claims (5)
1. The integral forming process of the boiler header pipe seat is characterized by comprising the following steps of: A) scribing an inner diameter line of a tube hole, an inner diameter line and an outer diameter line of a tube seat and a tube seat manufacturing range line on a tube body; B) processing a pipe hole on the cylinder according to an inner diameter line; C) integrally manufacturing and molding the tube seat on the tube body by adopting a 3D printing mode for the metal printing material according to the inner diameter line, the outer diameter line and the manufacturing range line of the tube seat, wherein the tube seat comprises a tube body of the tube seat and a root reinforcing transition section; D) carrying out 100% nondestructive inspection on the whole tube seat; E) and carrying out heat treatment after the pipe seat is integrally formed.
2. The integral forming process of the boiler header pipe seat according to claim 1, wherein: in the step A), the diameter d of the inner diameter line of the tube hole of the scribed barrel body is the diameter of the inner diameter line of the tube seat minus 2b, the value of b is 0-5 mm, and the diameters of the inner diameter line of the scribed barrel body and the inner diameter line of the scribed diameter line of the tube hole are both smaller than the designed inner diameters d1 of the tube seat and the tube hole; after step C, machining allowance for the inner diameter of the tube seat of the cylinder body and the inner diameter of the tube hole is removed, so that the inner diameters of the tube seat and the tube hole reach the designed inner diameter d 1.
3. The integral forming process of the boiler header pipe seat according to claim 1 or 2, wherein: the metal printing material is metal alloy powder or metal alloy wire, and the material and the performance of the metal printing material are the same as or similar to those of the tube seat.
4. The integral forming process of the boiler header pipe seat according to claim 3, wherein: and D, performing nondestructive inspection in the step D, wherein the nondestructive inspection is one or a combination of more than two of magnetic powder inspection, penetrant inspection and ultrasonic inspection.
5. The integral forming process of the boiler header pipe seat according to claim 4, wherein: and E, performing integral heat treatment or local heat treatment, wherein during the local heat treatment, the heating and heat-preserving area comprises the whole pipe seat and the header cylinder body within the range of at least 200mm at two sides of the pipe seat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911396544.3A CN111112952A (en) | 2019-12-30 | 2019-12-30 | Integral forming process for pipe seat of boiler header |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911396544.3A CN111112952A (en) | 2019-12-30 | 2019-12-30 | Integral forming process for pipe seat of boiler header |
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| CN111112952A true CN111112952A (en) | 2020-05-08 |
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| CN201911396544.3A Pending CN111112952A (en) | 2019-12-30 | 2019-12-30 | Integral forming process for pipe seat of boiler header |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113102767A (en) * | 2021-03-18 | 2021-07-13 | 北京控制工程研究所 | 3D printing process method for integrally preparing plate type surface tension storage tank |
| US20230104816A1 (en) * | 2021-10-05 | 2023-04-06 | Delavan Inc. | Material deposition for fluid nozzle joints |
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2019
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113102767A (en) * | 2021-03-18 | 2021-07-13 | 北京控制工程研究所 | 3D printing process method for integrally preparing plate type surface tension storage tank |
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| US11890692B2 (en) * | 2021-10-05 | 2024-02-06 | Collins Engine Nozzles, Inc. | Material deposition for fluid nozzle joints |
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Application publication date: 20200508 |
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