CN118768412A - Manufacturing method of equal inner diameter tee and equal inner diameter tee - Google Patents

Abstract

The present application discloses a manufacturing method of a tee with equal inner diameter and a tee with equal inner diameter, and belongs to the field of pipeline technology. The embodiment of the present application provides a manufacturing method of a tee with equal inner diameter, wherein the method obtains a blank tee by extrusion molding a tube blank, obtains a blank tee with an inner diameter deviation that meets the requirements by rounding the blank tee, obtains a blank tee with mechanical properties that meet the requirements by heat treating the blank tee with an inner diameter deviation that meets the requirements, obtains a tee with an inner diameter size that meets the requirements by mechanically processing the inner diameters of the main pipe and branch pipe in the blank tee with mechanical properties that meet the requirements, and then performs groove processing and inspection on the pipe mouth of the tee, and obtains an equal inner diameter tee when the inspection is qualified. It can be seen from this that the method can manufacture an equal inner diameter tee with the same inner diameter as the butt-jointed pipe, thereby meeting the welding requirements between the equal inner diameter tee and the butt-jointed pipe.

Description

Manufacturing method of equal inner diameter tee and equal inner diameter tee

Technical Field

The present application relates to the technical field of pipelines, and in particular to a manufacturing method of a tee with equal inner diameter and a tee with equal inner diameter.

Background Art

Tees are important pipe accessories in pipeline engineering construction, mainly used for pipe branching, direction change, diameter change, etc. Tees are mainly divided into equal inner diameter tees and equal outer diameter tees. Among them, equal outer diameter tees refer to that the theoretical outer diameters of the butt pipe and the tee are equal, and equal inner diameter tees refer to that the theoretical inner diameters of the butt pipe and the tee are equal. To ensure that the theoretical inner diameters of the butt pipe and the tee are equal, it is necessary to ensure that the excess wall thickness of the tee than that of the butt pipe is completely distributed on the outer wall side. It can be seen that the requirements for equal inner diameter tees are relatively stringent. Therefore, how to manufacture equal inner diameter tees has become an urgent problem to be solved in this field.

Summary of the invention

The present application provides a method for manufacturing a tee with equal inner diameter and a tee with equal inner diameter, which can manufacture a tee with equal inner diameter equal to the inner diameter of a butt pipe, thereby meeting the welding requirements between the tee with equal inner diameter and the butt pipe. The technical solution is as follows:

On the one hand, a method for manufacturing a tee with equal inner diameter is provided, the manufacturing method comprising:

Pre-treating the raw materials of the tee to obtain a tube blank;

Extrusion molding is performed on the tube blank to obtain a blank tee;

The blank tee after extrusion forming is calibrated to obtain a blank tee with an inner diameter deviation that meets the requirements;

Heat treating the rough tee with the inner diameter deviation meeting the requirement to obtain the rough tee with the mechanical properties meeting the requirement;

The inner diameters of the first main pipe, the second main pipe and the first branch pipe in the rough tee with the mechanical properties meeting the requirements are machined to obtain a tee with the inner diameter meeting the requirements; wherein, for the tee with the inner diameter meeting the requirements, the inner diameter of the first main pipe is equal to the inner diameter of the first butt pipe, the inner diameter of the second main pipe is equal to the inner diameter of the second butt pipe, and the inner diameter of the first branch pipe is equal to the inner diameter of the third butt pipe;

Beveling the pipe opening of the tee with the inner diameter meeting the requirements to obtain a tee meeting the welding technical requirements;

The tee that meets the welding technical requirements is inspected; if the inspection is qualified, a manufactured tee with equal inner diameter is obtained.

In a possible implementation, if the raw material of the tee is a steel plate, the raw material of the tee is pre-processed to obtain a tube blank, including:

Cutting the tee raw material by flame cutting to obtain a steel plate with a size that meets the requirements;

Performing groove processing on the steel plate by a milling machine;

The steel plate after groove processing is rolled into a cylinder by a plate rolling machine, and the longitudinal seam of the cylinder is welded to obtain the tube blank.

In another possible implementation, the extrusion molding of the tube blank to obtain a blank tee includes:

The tube blank is heated, and the heated tube blank is subjected to hot extrusion drawing and forming by tooling equipment to obtain a blank tee with a target size and a target shape;

marking a cutting line on the blank tee of the target size and target shape;

The blank tee of the target size and target shape is cut according to the cutting line by a flame cutting method to obtain the blank tee.

In another possible implementation, heat treating the rough tee with the inner diameter deviation meeting the requirement to obtain the rough tee with the mechanical properties meeting the requirement includes:

The blank tee with the inner diameter deviation meeting the requirement is heat treated by a quenching heat treatment method; the blank tee after the quenching heat treatment is tempered to obtain the blank tee with the mechanical properties meeting the requirement; or,

The blank tee with the inner diameter deviation meeting the requirements is heat treated by a normalizing heat treatment method to obtain the blank tee with the mechanical properties meeting the requirements.

In another possible implementation, the inner diameters of the first main pipe, the second main pipe, and the first branch pipe in the blank tee with mechanical properties meeting the requirements are mechanically processed to obtain a tee with an inner diameter meeting the requirements, including:

Taking the inner diameters of the first butt-jointed pipe, the second butt-jointed pipe and the third butt-jointed pipe as reference, measuring the roundness deviations of the first main pipe, the second main pipe and the first branch pipe in the rough tee whose mechanical properties meet the requirements;

According to the roundness deviation, an inner diameter processing reference line is marked on the pipe mouth of the blank tee whose mechanical properties meet the requirements;

According to the inner diameter processing reference line, the inner diameters of the first main pipe, the second main pipe and the first branch pipe in the blank tee whose mechanical properties meet the requirements are machined;

The inner surface of the processed rough tee is ground by a processing tool to obtain a tee with an inner diameter that meets the requirements.

In another possible implementation, the manufacturing method further includes:

Sealing the pipe opening of the tee;

Connecting a pressure test device to the sealed tee, and performing a pressure test on the sealed tee under the test parameters of the pressure test device;

In the case that the tee after the sealing treatment passes the pressure test, the step of inspecting the tee that meets the welding technical requirements is performed.

In another possible implementation, the inspecting the tee that meets the welding technical requirements includes at least one of the following:

Under conditions of sufficient light, inspect the appearance of the tee that meets the welding technical requirements;

Using an inspection tool to inspect the size and shape of the tee that meets the welding technical requirements;

The tee that meets the welding technical requirements is subjected to non-destructive testing by means of non-destructive testing equipment.

On the other hand, a tee with equal inner diameter is provided, wherein the tee with equal inner diameter is manufactured by any of the manufacturing methods described above;

The equal inner diameter tee comprises: a first main pipe, a second main pipe and a first branch pipe;

The inner diameter of the first main pipe is equal to the inner diameter of the first docking pipe, the inner diameter of the second main pipe is equal to the inner diameter of the second docking pipe, and the inner diameter of the first branch pipe is equal to the inner diameter of the third docking pipe.

In a possible implementation manner, an inner diameter of the first main pipe is equal to an inner diameter of the second main pipe.

In another possible implementation manner, the inner diameter of the first main pipe, the inner diameter of the second main pipe, and the inner diameter of the first branch pipe are equal.

The embodiment of the present application provides a method for manufacturing a tee with equal inner diameter, wherein the method obtains a blank tee by extruding a tube blank, obtains a blank tee with an inner diameter deviation that meets the requirements by rounding the blank tee, obtains a blank tee with mechanical properties that meet the requirements by heat treating the blank tee with an inner diameter deviation that meets the requirements, obtains a tee with an inner diameter size that meets the requirements by mechanically processing the inner diameters of the main pipe and the branch pipe in the blank tee with mechanical properties that meet the requirements, and then performs groove processing and inspection on the pipe mouth of the tee, and obtains a tee with equal inner diameter when the inspection is qualified. It can be seen that the method can manufacture a tee with equal inner diameter equal to the inner diameter of the butt pipe, thereby meeting the welding requirements between the equal inner diameter tee and the butt pipe.

It is to be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a flow chart of a method for manufacturing a tee with equal inner diameter provided in an embodiment of the present application;

FIG. 2 is a schematic diagram of a tee with equal inner diameter provided in an embodiment of the present application.

The reference numerals represent:

10-first main pipe, 11-second main pipe, 12-first branch pipe, 20-first docking pipe,

21 - second docking pipeline, 22 - third docking pipeline.

DETAILED DESCRIPTION

In order to make the technical solutions and advantages of the present application clearer, the implementation methods of the present application are described in further detail below.

The terms "first", "second", "third" and "fourth" etc. in the specification and claims of the present application and the drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

FIG. 1 is a flow chart of a method for manufacturing a tee with equal inner diameter provided in an embodiment of the present application. Referring to FIG. 1 , the manufacturing method includes:

Step 101: pre-treat the tee raw material to obtain a tube blank.

In this step, the wall thickness of the tee raw material can be calculated first, and then the tee raw material can be selected according to the wall thickness of the tee raw material, and then the selected raw material can be pre-processed to obtain a tube blank.

Among them, the minimum design wall thickness of the equal inner diameter tee can be calculated according to the design technical data of the equal inner diameter tee, and then the wall thickness of the tee raw material can be calculated through experiments, computer simulation analysis and other methods based on the minimum design wall thickness of the equal inner diameter tee, forming method, size and shape after forming.

After calculating the wall thickness of the tee raw material, the chemical composition, mechanical properties, microstructure, size and other tee raw materials that meet the design requirements can be selected according to the design technical data of the equal inner diameter tee. The tee raw material includes at least one of a seamless steel pipe, a welded steel pipe, a steel plate, and a tubular steel billet. The material of the tee raw material can be carbon steel, low alloy steel, stainless steel, etc. with good weldability, and no specific limitation is made to this. The following is an example of a tee raw material of a low alloy steel plate and a low alloy steel seamless steel pipe.

If the raw material of the tee is a low-alloy steel plate, the raw material of the tee is pre-processed to obtain the tube blank in the following process: according to the tube blank size requirements, the raw material of the tee is cut by flame cutting or sawing to obtain a steel plate with the required size; the steel plate is beveled by a milling machine; the steel plate with the beveled steel plate is rolled into a cylinder by a plate rolling machine, and the longitudinal seam of the cylinder is welded to obtain the tube blank.

Among them, the longitudinal seam of the cylinder can be pre-welded in the form of spot welding by manual welding, and then the longitudinal seam of the cylinder can be further welded by manual welding, submerged arc welding and other methods, and finally the tube blank required for manufacturing the tee with equal inner diameter can be obtained.

If the raw material of the tee is a low alloy steel seamless steel pipe, the raw material of the tee is pretreated to obtain a tube blank by cutting the raw material of the tee with flame cutting or sawing to cut the tube sections of the required size to obtain the tube blank.

Step 102: Extrusion-molding the tube blank to obtain a blank tee.

This step can be achieved by following the steps (1) to (3), including:

(1) The tube blank is heated, and the heated tube blank is hot extruded and drawn by a tooling device to obtain a blank tee with a target size and a target shape.

Taking into account the influence of factors such as the type, steel grade, and wall thickness of the tee raw materials, the appropriate extrusion and drawing forming method and equipment can be selected. After the extrusion and drawing forming method and equipment are determined, the tube blank is heated, and then the heated tube blank is hot extruded and drawn through the corresponding tooling equipment to obtain a blank tee with the target size and shape.

After obtaining the blank tee, the forming size and shape of the blank tee can be inspected by using inspection tools such as tape measure, caliper, caliper, ultrasonic measuring instrument, etc. If the inspection is qualified, step (2) is performed. If the inspection is unqualified, the tube blank is continuously hot extruded and drawn until it passes the inspection.

(2) Mark the cutting line on the blank tee.

According to the design drawings and technical requirements of equal inner diameter tees, the reference line is marked on the blank tee, the cutting line is determined based on the reference line, and then the cutting line is marked on the blank tee. Among them, the reference line is the lowest limit that the equal inner diameter tee must meet, and there is a certain margin between the cutting line and the reference line to prevent excessive cutting in some cases, resulting in the final manufactured equal inner diameter tee size not meeting the requirements.

(3) The blank tee of the target size and target shape is cut according to the cutting line by a flame cutting method to obtain the blank tee.

When cutting a blank tee of target size and target shape, the blank tee of target size and target shape can be placed on a rotating platform, and then the remaining materials of the first main pipe, the second main pipe and the first branch pipe in the blank tee of target size and target shape can be cut off along the cutting line by a flame cutting method to obtain the blank tee.

After the rough tee is obtained, the size and shape of the rough tee can be inspected by using inspection tools such as a tape measure, a caliper, a caliper, an ultrasonic measuring instrument, etc. If the inspection is qualified, step 103 is executed.

Step 103: The extruded rough tee is calibrated to obtain a rough tee with an inner diameter deviation that meets the requirements.

In this step, the first main pipe, the second main pipe and the first branch pipe in the extruded rough tee can be calibrated by a roundness calibration tooling device to obtain a rough tee whose inner diameter and roundness deviation meet the requirements.

Step 104: heat-treating the rough tee with the inner diameter deviation meeting the requirements to obtain the rough tee with the mechanical properties meeting the requirements.

In a possible implementation, the rough tee with the inner diameter deviation meeting the requirements is heat treated by a quenching+tempering heat treatment method.

In this implementation, the blank tee with the inner diameter deviation meeting the requirements can be first heat treated by a quenching heat treatment method, and then the blank tee after the quenching heat treatment can be tempered to obtain a blank tee with mechanical properties meeting the requirements and microstructure meeting the requirements.

In another possible implementation, the blank tee with the inner diameter deviation meeting the requirements is heat treated by a normalizing heat treatment method to obtain a blank tee with the mechanical properties meeting the requirements and the microstructure meeting the requirements.

In the embodiment of the present application, different heat treatment methods can be selected for different tee raw materials. For example, when the tee raw material is a low alloy steel plate, a quenching + tempering heat treatment method can be selected, and when the tee raw material is a low alloy steel seamless steel pipe, a normalizing heat treatment method can be selected. Of course, in practical applications, other heat treatment methods can also be selected, which will not be listed here one by one.

It should be noted that after obtaining a rough tee with mechanical properties that meet the requirements, the rough tee can be pre-treated by sandblasting to remove rust. The process can be: using a combination of dry spraying and power tools to clean the oxides, rust, oil stains and other impurities on the surface of the rough tee, and then inspecting the surface quality of the cleaned rough tee. The inspection should meet the technical requirements of appearance inspection, size inspection, non-destructive testing, etc. If the inspection is qualified, step 105 is executed.

Step 105: machining the inner diameters of the first main pipe, the second main pipe and the first branch pipe in the rough tee whose mechanical properties meet the requirements to obtain a tee whose inner diameter size meets the requirements.

Among them, for the tee with the inner diameter size meeting the requirements, the inner diameter of the first main pipe is equal to the inner diameter of the first docking pipe, the inner diameter of the second main pipe is equal to the inner diameter of the second docking pipe, and the inner diameter of the first branch pipe is equal to the inner diameter of the third docking pipe.

This step can be achieved by following the steps (1) to (4), including:

(1) Taking the inner diameters of the first butt joint pipe, the second butt joint pipe and the third butt joint pipe as the reference, measure the roundness deviation of the first main pipe, the second main pipe and the first branch pipe in the rough tee whose mechanical properties meet the requirements.

In this step, a measuring tool may be used to respectively measure the roundness deviation of the first main pipe, the roundness deviation of the second main pipe, and the roundness deviation of the first branch pipe in the rough tee whose mechanical properties meet the requirements.

(2) Based on the roundness deviation, the inner diameter processing reference line is marked on the pipe mouth of the blank tee whose mechanical properties meet the requirements.

According to the roundness deviation of the first main pipe, the inner diameter processing reference line is marked at the pipe mouth of the first main pipe; according to the roundness deviation of the second main pipe, the inner diameter processing reference line is marked at the pipe mouth of the second main pipe; according to the roundness deviation of the first branch pipe, the inner diameter processing reference line is marked at the pipe mouth of the first branch pipe.

(3) According to the inner diameter processing reference line, the inner diameters of the first main pipe, the second main pipe and the first branch pipe in the blank tee whose mechanical properties meet the requirements are machined.

According to the inner diameter machining reference line corresponding to the first main pipe, the inner diameter of the first main pipe is machined by a lathe or a boring machine, and after machining, the inner diameter of the first main pipe is equal to the inner diameter of the first butt pipe.

According to the inner diameter processing reference line corresponding to the second main pipe, the inner diameter of the second main pipe is machined by a lathe or a boring machine, and after the machining, the inner diameter of the second main pipe is equal to the inner diameter of the second butt pipe.

According to the inner diameter processing reference line corresponding to the first branch pipe, the inner diameter of the first branch pipe is machined by a lathe or a boring machine, and after the machining, the inner diameter of the first branch pipe is equal to the inner diameter of the third butt pipe.

In practical applications, equal inner diameter tees can be manufactured according to the inner diameter of the docking pipes. Accordingly, the inner diameters of the first docking pipe, the second docking pipe, and the third docking pipe can be equal or unequal. If the inner diameters of the first docking pipe, the second docking pipe, and the third docking pipe are equal, then the inner diameters of the first main pipe, the second main pipe, and the first branch pipe are equal. If the inner diameters of the first docking pipe and the second docking pipe are equal, but not equal to the inner diameter of the third docking pipe, then the inner diameters of the first main pipe and the second main pipe are equal, but not equal to the inner diameter of the first branch pipe. Of course, the inner diameters of the first docking pipe, the inner diameters of the second docking pipe, and the third docking pipe can also be unequal. In this case, the inner diameters of the first main pipe, the inner diameters of the second main pipe, and the first branch pipe are also unequal.

(4) The inner surface of the processed rough tee is ground by a processing tool to obtain a tee with an inner diameter that meets the requirements.

In this step, power tools can be used to grind the transition lines, edges and corners on the inner surface of the processed rough tee formed by mechanical processing to obtain a tee with a smooth inner surface. The inner diameter of the tee is then detected by tools such as a caliper ruler and a caliper plate. If the test is qualified, a tee with an inner diameter that meets the requirements is obtained.

Step 106: Bevel the pipe opening of the tee whose inner diameter meets the requirements to obtain a tee that meets the welding technical requirements.

In this step, according to the design drawings and technical requirements of equal inner diameter tees, a beveling machine is used to bevel the pipe openings of the first main pipe, the second main pipe and the first branch pipe in the tees whose inner diameter dimensions meet the requirements, so that the bevel form and size of the tee meet the welding technical requirements, thereby obtaining a tee that meets the welding technical requirements.

The manufacturing method provided by the present application can achieve that the inner diameter of the tee is completely equal to the inner diameter of the butt pipe, and the inner diameter non-circularity is not greater than 0.3%. When the two are welded together, there is no misalignment phenomenon and internal matching problem on the inner wall side, so that the tee and the butt pipe are better suitable for the pipeline full-automatic welding method, which is conducive to improving the pipeline welding quality and efficiency, especially the root welding quality. At the same time, there is no wall thickness difference and no inner diameter mutation on the inner wall side of the transition zone between the tee and the butt pipe, which makes it easier for pipeline cleaning and detection equipment to pass through the transition zone between the two, reducing pipeline pressure fluctuations and their impact on the quality of the girth weld.

In the embodiment of the present application, after obtaining the tee that meets the welding technical requirements, step 107 can be directly executed, or the tee can be subjected to a pressure test first, and then step 107 is executed if it passes the pressure test.

In one possible implementation, the process of performing a pressure test on a tee is as follows: sealing the pipe opening of the tee; connecting a pressure test device to the sealed tee, and performing a pressure test on the sealed tee under the test parameters of the pressure test device; if the sealed tee passes the pressure test, executing step 107.

In this implementation, one or a combination of sealing devices such as pipe caps, end caps, blind plates, etc. can be selected for welding sealing, or a detachable sealing device can be used to seal the pipe opening of the tee. Then select the appropriate pressure test equipment, connect the pressure test equipment tightly to the tee, and perform a pressure test on the sealed tee under the test parameters of the pressure test equipment. If the sealed tee has no leakage or deformation within the preset time, it means that the tee has passed the pressure test. If the sealed tee has problems such as leakage and deformation, it means that the tee has failed the pressure test.

If the tee is welded and sealed, the welded part is cut off after the pressure test. In addition, the pressure test can be carried out by one or a combination of hydraulic pressure test, gas pressure test and gas-liquid combined pressure test, etc., which is not specifically limited in the embodiments of the present application.

Step 107: Inspect the tee that meets the welding technical requirements.

In this step, the inspection of the tee that meets the welding technical requirements includes at least one of the following:

Under conditions of sufficient light, inspect the appearance of the tee that meets the welding technical requirements;

Use inspection tools to inspect the size and shape of the tee that meets welding technical requirements;

Non-destructive testing is performed on tees that meet welding technical requirements using non-destructive testing equipment.

Among them, under the condition of sufficient light, the staff can visually inspect the appearance of the tee. The size and shape of the tee can be inspected by inspection tools such as tape measure, caliper, caliper, ultrasonic measuring instrument, etc. The tee can be non-destructively inspected by non-destructive testing equipment such as X-ray, ultrasonic, magnetic powder, and penetration.

In the embodiment of the present application, if the inspection of the tee includes the inspection of the appearance of the tee, the inspection of the size and shape of the tee, and the non-destructive inspection of the tee, the inspection order can be set and changed as needed, and there is no specific limitation on this. For example, the appearance of the tee is inspected first, then the size and shape of the tee are inspected, and finally the non-destructive inspection is performed on the tee. Alternatively, the size and shape of the tee are inspected first, then the appearance of the tee is inspected, and finally the non-destructive inspection is performed on the tee.

Step 108: If the test is qualified, the manufactured equal inner diameter tee is obtained.

When all indicators are tested and qualified, the equal inner diameter tee is obtained.

The embodiment of the present application provides a method for manufacturing a tee with equal inner diameter, wherein the method obtains a blank tee by extruding a tube blank, obtains a blank tee with an inner diameter deviation that meets the requirements by rounding the blank tee, obtains a blank tee with mechanical properties that meet the requirements by heat treating the blank tee with an inner diameter deviation that meets the requirements, obtains a tee with an inner diameter size that meets the requirements by mechanically processing the inner diameters of the main pipe and the branch pipe in the blank tee with mechanical properties that meet the requirements, and then performs groove processing and inspection on the pipe mouth of the tee, and obtains a tee with equal inner diameter when the inspection is qualified. It can be seen that the method can manufacture a tee with equal inner diameter equal to the inner diameter of the butt pipe, thereby meeting the welding requirements between the equal inner diameter tee and the butt pipe.

The embodiment of the present application also provides a tee with equal inner diameter, which is manufactured by any of the above manufacturing methods;

Referring to FIG. 2 , the inner diameter tee comprises: a first main pipe 10 , a second main pipe 11 and a first branch pipe 12 ;

The inner diameter of the first main pipe 10 is equal to the inner diameter of the first docking pipe 20 , the inner diameter of the second main pipe 11 is equal to the inner diameter of the second docking pipe 21 , and the inner diameter of the first branch pipe 12 is equal to the inner diameter of the third docking pipe 22 .

Among them, the inner diameters of the first docking pipe 20, the inner diameters of the second docking pipe 21, and the inner diameters of the third docking pipe 22 may be equal or unequal. If the inner diameters of the first docking pipe 20, the inner diameters of the second docking pipe 21, and the inner diameters of the third docking pipe 22 are equal, then the inner diameters of the first main pipe 10, the inner diameters of the second main pipe 11, and the inner diameters of the first branch pipe 12 are equal. If the inner diameters of the first docking pipe 20, the inner diameters of the second docking pipe 21, and the inner diameters of the third docking pipe 22 are unequal, then the inner diameters of the first main pipe 10, the inner diameters of the second main pipe 11, and the inner diameters of the first branch pipe 12 are unequal.

If the inner diameter of the first docking pipe 20 is equal to the inner diameter of the second docking pipe 21, and is not equal to the inner diameter of the third docking pipe 22, then the inner diameter of the first main pipe 10 is equal to the inner diameter of the second main pipe 11, and is not equal to the inner diameter of the first branch pipe 12. If the inner diameter of the first docking pipe 20 is equal to the inner diameter of the third docking pipe 22, and is not equal to the inner diameter of the second docking pipe 21, then the inner diameter of the first main pipe 10 is equal to the inner diameter of the first branch pipe 12, and is not equal to the inner diameter of the second main pipe 11. If the inner diameter of the second docking pipe 21 is equal to the inner diameter of the third docking pipe 22, and is not equal to the inner diameter of the first docking pipe 20, then the inner diameter of the second main pipe 11 is equal to the inner diameter of the first branch pipe 12, and is not equal to the inner diameter of the first main pipe 10.

The equal inner diameter tee manufactured in the embodiment of the present application can achieve that the inner diameter of the tee is completely equal to the inner diameter of the butt pipe, and the inner diameter non-circularity is no more than 0.3%. When the two are butt-welded, there is no misalignment on the inner wall side and no problem of internal matching, so that the tee and the butt pipe are better suitable for the fully automatic pipe welding method.

A person skilled in the art will understand that all or part of the steps to implement the above embodiments may be accomplished by hardware or by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a disk or an optical disk, etc.

The above description is only for the purpose of facilitating those skilled in the art to understand the technical solution of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. A method for manufacturing a tee with equal inner diameter, characterized in that the manufacturing method comprises: Pre-treating the raw materials of the tee to obtain a tube blank; Extrusion molding is performed on the tube blank to obtain a blank tee; The blank tee after extrusion forming is calibrated to obtain a blank tee with an inner diameter deviation that meets the requirements; Heat treating the rough tee with the inner diameter deviation meeting the requirement to obtain the rough tee with the mechanical properties meeting the requirement; The inner diameters of the first main pipe, the second main pipe and the first branch pipe in the rough tee with the mechanical properties meeting the requirements are machined to obtain a tee with the inner diameter meeting the requirements; wherein, for the tee with the inner diameter meeting the requirements, the inner diameter of the first main pipe is equal to the inner diameter of the first butt pipe, the inner diameter of the second main pipe is equal to the inner diameter of the second butt pipe, and the inner diameter of the first branch pipe is equal to the inner diameter of the third butt pipe; Beveling the pipe opening of the tee with the inner diameter meeting the requirements to obtain a tee meeting the welding technical requirements; The tee that meets the welding technical requirements is inspected; if the inspection is qualified, a manufactured tee with equal inner diameter is obtained. 2. The manufacturing method according to claim 1, characterized in that if the raw material of the tee is a steel plate, the pretreatment of the raw material of the tee to obtain a tube blank comprises: Cutting the tee raw material by flame cutting to obtain a steel plate with a size that meets the requirements; Performing groove processing on the steel plate by a milling machine; The steel plate after groove processing is rolled into a cylinder by a plate rolling machine, and the longitudinal seam of the cylinder is welded to obtain the tube blank. 3. The manufacturing method according to claim 1, characterized in that the extrusion molding of the tube blank to obtain the blank tee comprises: The tube blank is heated, and the heated tube blank is subjected to hot extrusion drawing and forming by tooling equipment to obtain a blank tee with a target size and a target shape; marking a cutting line on the blank tee of the target size and target shape; The blank tee of the target size and target shape is cut according to the cutting line by a flame cutting method to obtain the blank tee. 4. The manufacturing method according to claim 1, characterized in that the heat treatment of the blank tee with the inner diameter deviation meeting the requirements to obtain the blank tee with the mechanical properties meeting the requirements comprises: The blank tee with the inner diameter deviation meeting the requirements is heat treated by a quenching heat treatment method; the blank tee after the quenching heat treatment is tempered to obtain the blank tee with the mechanical properties meeting the requirements; or, The blank tee with the inner diameter deviation meeting the requirements is heat treated by a normalizing heat treatment method to obtain the blank tee with the mechanical properties meeting the requirements. 5. The manufacturing method according to claim 1, characterized in that the inner diameters of the first main pipe, the second main pipe and the first branch pipe in the blank tee with mechanical properties meeting the requirements are mechanically processed to obtain a tee with an inner diameter meeting the requirements, comprising: Taking the inner diameters of the first butt-jointed pipe, the second butt-jointed pipe and the third butt-jointed pipe as reference, measuring the roundness deviations of the first main pipe, the second main pipe and the first branch pipe in the rough tee whose mechanical properties meet the requirements; According to the roundness deviation, an inner diameter processing reference line is marked on the pipe mouth of the blank tee whose mechanical properties meet the requirements; According to the inner diameter processing reference line, the inner diameters of the first main pipe, the second main pipe and the first branch pipe in the blank tee whose mechanical properties meet the requirements are machined; The inner surface of the processed rough tee is ground by a processing tool to obtain a tee with an inner diameter that meets the requirements. 6. The manufacturing method according to claim 1, characterized in that the manufacturing method further comprises: Sealing the pipe opening of the tee; Connecting a pressure test device to the sealed tee, and performing a pressure test on the sealed tee under the test parameters of the pressure test device; In the case that the tee after the sealing treatment passes the pressure test, the step of inspecting the tee that meets the welding technical requirements is performed. 7. The manufacturing method according to claim 1 or 6, characterized in that the inspection of the tee that meets the welding technical requirements includes at least one of the following: Under conditions of sufficient light, inspect the appearance of the tee that meets the welding technical requirements; Using an inspection tool to inspect the size and shape of the tee that meets the welding technical requirements; The tee that meets the welding technical requirements is subjected to non-destructive testing by means of non-destructive testing equipment. 8. A tee with equal inner diameter, characterized in that the tee with equal inner diameter is manufactured by the manufacturing method according to any one of claims 1 to 7; The equal inner diameter tee comprises: a first main pipe, a second main pipe and a first branch pipe; The inner diameter of the first main pipe is equal to the inner diameter of the first docking pipe, the inner diameter of the second main pipe is equal to the inner diameter of the second docking pipe, and the inner diameter of the first branch pipe is equal to the inner diameter of the third docking pipe. 9 . The equal inner diameter tee according to claim 8 , wherein the inner diameter of the first main pipe is equal to the inner diameter of the second main pipe. 10 . The equal inner diameter tee according to claim 8 , wherein the inner diameters of the first main pipe, the second main pipe and the first branch pipe are equal.