Manufacturing method of copper-nickel alloy crimped tee joint

Abstract

The application provides a copper-nickel alloy swage tee manufacturing method, which comprises the following steps: step one, blanking: according to the pipe opening type of the swage tee to be manufactured, a main pipe and a branch pipe are prepared, wherein the pipe opening type is divided into a swage equal-diameter tee and a swage unequal-diameter tee; step two, forming: the main pipe and the branch pipe are respectively subjected to swage forming through an end forming machine; step three, main pipe opening drawing: an oval hole is processed through a drilling machine, a semicircular ball is used to draw the oval hole to form a first interface, and a flat opening machine is used for machining; step four, cleaning of the main pipe and the branch pipe; step five, annealing treatment; and step six, welding and detection. Through the copper-nickel alloy swage tee manufacturing method, the swage equal-diameter tee or the swage unequal-diameter tee can be prepared, the applicability of the manufacturing method is improved, the batch production efficiency of the swage tee is improved, the manufacturing cost of the swage tee is reduced, and the stability and reliability of the manufacturing method are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal material processing and manufacturing methods, in particular to a copper-nickel alloy clamp-pressing type tee joint manufacturing method. BACKGROUND

[0002] Due to the excellent resistance to marine biofouling, excellent resistance to seawater corrosion, better strength and plastic processing performance of copper-nickel alloy, it has been widely used in seawater pipeline systems in the field of marine engineering and shipbuilding; among them, thin-walled clamp-pressing type pipe fittings are gradually popularized and applied in the field of construction due to their low cost and convenient construction characteristics, and some foreign marine and shipbuilding engineering has begun to use such products, but at present, copper-nickel alloy clamp-pressing type pipe fittings are not used in domestic shipbuilding and marine fields, and there is no batch production capacity of copper-nickel alloy clamp-pressing type pipe fittings.

[0003] In the invention patent CN112917107A "A stainless steel clamp-pressing type pipe fitting equal-diameter tee joint production process" introduces a stainless steel clamp-pressing type pipe fitting equal-diameter tee joint production process, the production process includes: feeding, laser cutting, chamfering, water swelling forming, punching, high-frequency heating, drawing, flat mouth, pipe fitting cleaning, bright solid solution annealing, polishing and grinding, installing sealing ring, pipe fitting test; Since the above-mentioned invention patent only contains equal-diameter tee joints, it does not contain unequal-diameter tee joints, so it has certain limitations for the preparation of different tee pipe fittings, in addition, the tee joint production process is complex, the manufacturing efficiency is low, and the manufacturing cost is high, in the patent CN213929893U, a clamp-pressing type equal-diameter tee joint is mentioned, the production mode of the tee joint is to obtain two pipe materials with different lengths by cutting, the longer pipe material is used as the main body, and the shorter pipe material is used to make the third clamp-pressing end, a through hole is punched on the side of the longer pipe material, then the two ends of the main body are extruded from the inside to the outside, so that the first clamp-pressing end and the second clamp-pressing end are formed, then the main body is extruded outward from the through hole on the side to form a connecting port, then the shorter pipe material is sleeved on the outside of the connecting port and welded to form a body, that is, the clamp-pressing type equal-diameter tee joint, and finally the shorter pipe material is extruded from the inside to the outside to form the third clamp-pressing end of the body; According to the patent, not only is there no description of the process during the welding process of the branch pipe, but only the structure of the equal-diameter tee joint is described, and no effective method for preparing unequal-diameter tee joints is proposed.

[0004] In summary, there is no public report on the manufacturing method of copper-nickel alloy clamp-pressing type tee joints (equal-diameter tee joints and unequal-diameter tee joints), so it is of great significance to study how to improve the preparation efficiency of clamp-pressing type equal-diameter and unequal-diameter tee joints. SUMMARY

[0005] Therefore, the present application aims to provide a copper-nickel alloy card pressing type tee joint manufacturing method to solve the problems of the prior art, such as the complex preparation method of the copper-nickel alloy card pressing type equal diameter tee joint, the low manufacturing efficiency, the limited batch production of the equal diameter tee joint, and the limited application range of the card pressing type tee joint preparation method, so as to effectively realize the preparation of the card pressing type equal diameter or reducing tee joint, improve the applicability of the manufacturing method, expand the application range of the manufacturing method, improve the batch production efficiency of the card pressing type tee joint, reduce the manufacturing cost of the card pressing type tee joint, and improve the stability and reliability of the manufacturing method.

[0006] To achieve the above-mentioned purpose, the technical scheme of the present application is as follows:

[0007] The present application relates to a copper-nickel alloy card pressing type tee joint manufacturing method, which comprises the following steps:

[0008] Step one, blanking: according to the pipe opening type of the card pressing type tee joint to be manufactured, a copper-nickel alloy seamless pipe is used as the raw material to obtain a main pipe and a branch pipe, wherein the pipe opening type is divided into a card pressing type equal diameter tee joint and a card pressing type reducing tee joint;

[0009] Step two, forming: the main pipe and the branch pipe are respectively subjected to card pressing forming by an end forming machine;

[0010] Step three, main pipe opening pulling: an oval hole is processed at the center position of the main pipe body by a drilling machine, a semicircular ball is used to draw the oval hole to form a first interface, and a pipe opening machine is used for machining;

[0011] Step four, cleaning of the main pipe and the branch pipe: the main pipe and the branch pipe are cleaned by adding cleaning auxiliaries to a vibrating polisher;

[0012] Step five, annealing treatment: the cleaned main pipe and branch pipe are subjected to annealing treatment;

[0013] Step six, welding and detection: the main pipe and the branch pipe are welded by using a laser-arc composite welding method, and are subjected to non-destructive testing.

[0014] Further, the step one comprises:

[0015] Step S11: blanking: the pipe opening type of the card pressing type tee joint is preset as a card pressing type equal diameter tee joint and a card pressing type reducing tee joint;

[0016] Step S12: judging whether the pipe opening type of the card pressing type tee joint to be manufactured is a card pressing type equal diameter tee joint, if yes, executing step S13, and if no, executing step S14;

[0017] Step S13: using copper-nickel alloy seamless pipe of the first specification as raw material, the main pipe and branch pipe are prepared by laser cutting, wherein the main pipe length is recorded as L mm, the branch pipe length is recorded as h mm, L > h, and step two is performed;

[0018] Step S14: using copper-nickel alloy seamless pipe of the second specification and the third specification as raw material respectively, the main pipe and branch pipe are prepared by laser cutting, wherein the main pipe length is recorded as L mm, the branch pipe length is recorded as h mm, L > h, and step two is performed.

[0019] Further, step two includes:

[0020] Step S21: smearing anti-wear and pressure-resistant oil on both ends of the main pipe, and placing the smeared main pipe into an end forming machine;

[0021] Step S22: end forming is performed on both ends of the main pipe by the end forming machine;

[0022] Step S23: smearing anti-wear and pressure-resistant oil on one end of the branch pipe, and placing the smeared branch pipe into the end forming machine;

[0023] Step S24: end forming is performed on one end of the branch pipe by the end forming machine; step three is performed.

[0024] Further, step three includes:

[0025] Step S31: processing an elliptical hole at the center of the main pipe body by a drilling machine;

[0026] Step S32: placing the main pipe with the hole into a hydraulic machine, and setting a semicircular ball on the elliptical hole;

[0027] Step S33: under the pressure of the hydraulic machine, the semicircular ball is separated from the elliptical hole by pressure, wherein the semicircular ball is drawn to form a first interface with the elliptical hole;

[0028] Step S34: machining the end of the first interface by a flat mouth machine to make it flat, and step four is performed.

[0029] Further, the diameter of the semicircular ball is d1 mm, the inner diameter of the first interface is d2 mm, d1 = d2 + ε, and ε is the inner diameter error coefficient.

[0030] Further, step four includes:

[0031] Step S41: placing the main pipe and the branch pipe after the hole drawing into a vibration polishing machine, and adding cleaning aids in the vibration polishing machine;

[0032] Step S42: setting parameters of the vibration polishing machine and polishing, and step five is performed, wherein the parameters include the polishing machine vibration frequency f and the polishing time t1.

[0033] Further, the cleaning auxiliary material includes any one or more of brown corundum abrasive and dishwashing liquid, and the abrasive is spherical.

[0034] Further, the step five includes:

[0035] Step S51: placing the cleaned main pipe and branch pipe into a vacuum heat treatment furnace for annealing;

[0036] Step S52: setting the heating temperature T and holding time t2 of the vacuum heat treatment furnace;

[0037] Step S53: judging whether the main pipe and branch pipe are cooled to the preset temperature T0 with the furnace, yes, executing step S54; no, returning to step S52;

[0038] Step S54: the annealing treatment is completed, the main pipe and branch pipe are taken out, and step six is executed.

[0039] Further, the step six includes:

[0040] Step S61: adopting the laser-arc hybrid welding method to weld the main pipe and branch pipe, to form the required clamp-type equal-diameter or reducing tee joint;

[0041] Step S62: performing non-destructive testing on the weld of the clamp-type equal-diameter or reducing tee joint after the welding is completed.

[0042] Further, the step S61 includes:

[0043] Step S611: welding preparation: removing surface impurities at the welding position and the edge of the main pipe and branch pipe;

[0044] Step S612: fixing the workpiece and the matching tooling, and performing laser teaching;

[0045] Step S613: performing positioning welding fixation on the main pipe and branch pipe after the workpiece assembly is completed, and filling protective gas into the main pipe and branch pipe;

[0046] Step S614: performing welding according to the process procedure requirements;

[0047] Step S615: after the welding is completed, checking the weld surface quality and the weld internal excess height, and executing step S62 after the qualification.

[0048] Compared with the prior art, the copper-nickel alloy clamp-type tee joint manufacturing method has the following beneficial effects:

[0049] Through the manufacturing method, the universal preparation of the card pressure type equal-diameter or unequal-diameter tee joint can be effectively realized, the applicability of the manufacturing method is improved, the application range of the manufacturing method is expanded, the batch production efficiency of the card pressure type tee joint is improved, the manufacturing cost of the card pressure type tee joint is reduced, and the stability and reliability of the manufacturing method are improved. BRIEF DESCRIPTION OF DRAWINGS

[0050] The accompanying drawings, which form a part of the present application, are incorporated herein to provide further understanding of the application and are incorporated herein for illustrative purposes only. The illustrative embodiments of the present application and their description serve to explain the present application. They should not be considered as limiting the present application. In addition, those skilled in the art will appreciate that the present application can be practiced with other embodiments as well, not just the embodiments as described herein.

[0051] In the drawings:

[0052] Figure 1 is a schematic diagram of a card pressure type branch pipe after forming;

[0053] Figure 2 is a schematic diagram of a card pressure type main pipe after forming;

[0054] Figure 3 is a schematic diagram of a card pressure type main pipe after pulling;

[0055] Figure 4 is a schematic diagram of a card pressure type tee joint product;

[0056] Figure 5 is a schematic diagram of a copper-nickel alloy DN65 equal-diameter card pressure type tee joint;

[0057] Figure 6 is a schematic diagram of a copper-nickel alloy DN80 / 50 unequal-diameter card pressure type tee joint.

[0058] Reference signs: 1, main pipe; 11, oval hole; 12, first interface; 2, branch pipe; 3, weld. DETAILED DESCRIPTION

[0059] The inventive concepts of the present disclosure will be described below using terms that are commonly used by those skilled in the art to convey the substance of their work to others skilled in the art. However, these inventive concepts can be embodied in many different forms, and therefore should not be considered as limited to the embodiments described herein.

[0060] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0061] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0062] The present embodiment is directed to the card pressure type tee joint manufacturing technology in the metal processing manufacturing technology, which is the same as the conventional card pressure type tee joint manufacturing technology, that is, the card pressure type tee joint overall structure is composed of a main pipe and a branch pipe.

[0063] In the prior art, only the manufacturing of the clamp-pressing equal-diameter tee is involved, and no effective manufacturing method is proposed for the manufacturing of the clamp-pressing unequal-diameter tee. In addition, it can be seen from the clamp-pressing equal-diameter tee manufacturing method and the production process mentioned in the prior art that the existing clamp-pressing equal-diameter tee production process is produced through feeding, laser cutting, chamfering, water swelling forming, punching, high-frequency heating, drawing, flat mouth, pipe cleaning, bright solid solution annealing, polishing and grinding, installing a sealing ring, and pipe testing. Even if part of the cutting obtains a long and a short pipe material, the longer pipe material is used as the main body, and the shorter pipe material is used as the third clamp-pressing end. The main body is first punched at both ends, and then the outer hole of the main body is extruded to form a connecting port. After installing the third clamp-pressing end, the third clamp-pressing end is finally punched to form a clamp-pressing equal-diameter tee.

[0064] In order to solve the problems that the preparation method of the copper-nickel alloy clamp-pressing equal-diameter tee in the prior art is complex, the manufacturing efficiency is low, the batch production of the equal-diameter tee is limited, and there is no related preparation method of the clamp-pressing unequal-diameter tee in the prior art, which limits the application range of the clamp-pressing tee preparation method; the embodiment proposes a copper-nickel alloy clamp-pressing tee manufacturing method, which comprises the following steps:

[0065] Step one, blanking: according to the pipe type of the clamp-pressing tee to be manufactured, a copper-nickel alloy seamless pipe is used as the raw material to obtain a main pipe 1 and a branch pipe 2, wherein the pipe type is divided into a clamp-pressing equal-diameter tee and a clamp-pressing unequal-diameter tee;

[0066] Step two, forming: the main pipe 1 and the branch pipe 2 are clamp-pressed by an end forming machine;

[0067] Step three, main pipe 1 mouth pulling: an oval hole 11 is processed in the center of the main pipe 1 body by a drilling machine, a semicircular ball is used to draw the oval hole 11 to form a first interface 12, and a mouth flattening machine is used for machining;

[0068] Step four, cleaning of the main pipe 1 and the branch pipe 2: the main pipe 1 and the branch pipe 2 are cleaned by adding cleaning auxiliaries to a vibrating polisher;

[0069] Step five, annealing treatment: the main pipe 1 and the branch pipe 2 after cleaning are subjected to annealing treatment;

[0070] Step six, welding and detection: the main pipe 1 and the branch pipe 2 are welded by a laser-arc composite welding method, and are subjected to non-destructive testing.

[0071] Through the processes of blanking, forming, main pipe 1 pulling, welding, heat treatment, nondestructive testing, etc., the manufacturing of the copper-nickel alloy clamp type tee joint can be successfully realized, and has the characteristics of high efficiency, low cost and stable welding process. In addition, the method is suitable for batch production of copper-nickel alloy clamp type tee joint, effectively realizes the preparation of clamp type equal or unequal tee joint, improves the applicability of the manufacturing method, expands the application range of the manufacturing method, improves the batch production efficiency of the clamp type tee joint, reduces the manufacturing cost of the clamp type tee joint, and improves the stability and reliability of the manufacturing method.

[0072] Step one includes:

[0073] Step S11: blanking: the pipe type of the clamp type tee joint is preset as clamp type equal or unequal tee joint;

[0074] Step S12: determining whether the pipe type of the clamp type tee joint to be manufactured is a clamp type equal tee joint, if yes, executing step S13, otherwise executing step S14;

[0075] Step S13: using copper-nickel alloy seamless pipe of the first specification as raw material, and preparing main pipe 1 and branch pipe 2 by laser cutting, wherein the length of main pipe 1 is L mm, the length of branch pipe 2 is h mm, and L > h, and executing step two;

[0076] Step S14: using copper-nickel alloy seamless pipe of the second and third specifications as raw material, respectively, and preparing main pipe 1 and branch pipe 2 by laser cutting, wherein the length of main pipe 1 is L mm, the length of branch pipe 2 is h mm, and L > h, and executing step two;

[0077] Wherein, using copper-nickel alloy seamless pipe as raw material, after cutting two sections of pipe (i.e. main pipe 1 and branch pipe 2) to the specified size, the end burrs of main pipe 1 and branch pipe 2 need to be removed, wherein main pipe 1 is used to make the main pipe of the formed clamp type equal or unequal tee joint, and branch pipe 2 is used to make the branch pipe of the formed clamp type equal or unequal tee joint, the length of main pipe 1 is greater than the length of branch pipe 2, in this embodiment, the specific values of h and L are set according to the requirements.

[0078] By distinguishing the pipe type of the clamp type tee joint to be manufactured, the application range of the manufacturing method can be effectively enhanced, the applicability of the manufacturing method can be improved, the manufacturing process of the equal or unequal tee joint can be simplified, the manufacturing efficiency of the manufacturing method can be provided, the cost required by using the manufacturing method can be reduced, the stability and reliability of the manufacturing can be greatly improved, and the clamp type tee joint can be produced in batches.

[0079] Step two includes:

[0080] Step S21: Apply anti-wear pressure oil to both ends of the main pipe 1, and place the coated main pipe 1 into the end forming machine, wherein the inner and outer surfaces of both ends of the main pipe 1 are coated with anti-wear pressure oil, and the anti-wear pressure oil needs to be evenly coated;

[0081] Step S22: Perform end forming on both ends of the main pipe 1 by the end forming machine, wherein the end forming requires the two ends of the main pipe 1 to be shaped into a curved surface suitable for clamping and pressing, and then step S23 is performed, and the end of the main pipe 1 is shaped into a three-way main pipe 1;

[0082] Step S23: Apply anti-wear pressure oil to one end of the branch pipe 2, and place the coated branch pipe 2 into the end forming machine, wherein the inner and outer surfaces of one end of the branch pipe 2 are coated with anti-wear pressure oil, and the anti-wear pressure oil needs to be evenly coated;

[0083] Step S24: Perform end forming on one end of the branch pipe 2 by the end forming machine; perform step three, wherein the end forming requires one end of the branch pipe 2 to be shaped into a curved surface suitable for clamping and pressing, and the end of the branch pipe 2 is shaped into a three-way branch pipe 2.

[0084] By performing end clamping and forming on the three-way main pipe 1 and the three-way branch pipe 2 in the same process, the process of the manufacturing method is simplified, and the end of the main pipe 1 and the branch pipe 2 is formed at one time, which is different from the prior art in which the main pipe is first formed at the end, and then the branch pipe is formed at the end after welding, so that the influence on the whole three-way pipe after welding is avoided during the end forming of the branch pipe, and the complexity of end forming is improved. Therefore, by providing step two of the present application, the disadvantages and complexity of end forming of the branch pipe 2 after the main pipe 1 and the branch pipe 2 are welded can be avoided, and the effectiveness of the device end forming is greatly improved, the welding operation steps of the main pipe 1 and the branch pipe 2 are facilitated, the manufacturing efficiency is improved, and the labor cost of manufacturing is reduced.

[0085] Step three includes:

[0086] Step S31: Main pipe 1 pullout: drill an oval hole 11 in the center of the main pipe 1 by a drilling machine, wherein the center position refers to the position shown in the radial symmetry line A of the main pipe 1 in the figure, that is, when the two ends of the main pipe 1 are symmetrical, the radial axis is seated, in addition, the major axis of the oval hole 11 is parallel to the axis of the main pipe 1;

[0087] Step S32: Place the main pipe 1 with the hole in the hydraulic machine, and set a semicircular ball on the oval hole 11, the semicircular ball is made of steel;

[0088] Step S33: Under the pressure of the hydraulic machine, the semicircular ball is separated from the oval hole 11 by pressure, wherein the semicircular ball pulls the oval hole 11 to form a first interface 12;

[0089] Step S34: machining the end of the first interface 12 by a flat mouth machine to make it flat, and executing step four;

[0090] Wherein, the diameter of the semicircle ball is d1 mm, the inner diameter of the first interface 12 is d2 mm, d1 = d2 + ε, ε is the inner diameter error coefficient, and the specific values of d1, d2 and ε are set according to requirements; preferably, ε is 0.5 mm-1 mm.

[0091] Through the setting of the pullout of the main pipe 1 in step three, the main pipe 1 can be effectively pulled out to form the first interface 12 under the action of the hydraulic machine and the semicircle ball, which is used to facilitate the welding preparation of the main pipe 1 and the branch pipe 2. At the same time, the pulling method can not only avoid the high cost problem of the interface between the main pipe and the branch pipe in the prior art which is formed by using the steel ball pressure to extrude the through hole, but also avoid the difficulty of fixing the steel ball. The use of the semicircle ball can effectively enhance the stability of the device structure during the pulling process, and the use of the hydraulic machine can further improve the efficiency and stability of the pulling of the main pipe 1, greatly improve the reliability of manufacturing, reduce the cost of manufacturing, and improve the safety of manufacturing. In addition, in order to consider the rebound problem after the material deformation, the diameter d1 of the semicircle ball is set to be greater than the inner diameter d2 mm of the target first interface 12 by ε, which can effectively avoid the occurrence of cracks when the oval hole 11 is pulled out, and is conducive to finding the center of the semicircle ball, greatly improving the accuracy and precision of the pullout.

[0092] Step four includes:

[0093] Step S41: placing the main pipe 1 and the branch pipe 2 after the pullout into a vibration polishing machine, and adding cleaning aids in the vibration polishing machine, which are used to remove slight scratches and oil stains on the surface of the main pipe 1 and the branch pipe 2;

[0094] Step S42: setting the parameters of the vibration polishing machine and polishing, and executing step five, wherein the parameters include the polishing machine vibration frequency f and the polishing time t1;

[0095] Wherein, the cleaning aids include any one or more of brown corundum abrasive and dishwashing liquid, and the abrasive is spherical. In this embodiment, the specific values of f and t1 are set according to requirements;

[0096] Preferably, spherical brown corundum abrasive is selected, the abrasive size is 10 mm-20 mm, the polishing machine vibration frequency f is 30 Hz / s, and the polishing time t1 is 10 min-20 min.

[0097] The mutual cooperation of the vibration polishing machine and the cleaning auxiliary material is conducive to cleaning the oil stains on the main pipe 1 and the branch pipe 2 in the process by means of the friction of the auxiliary material, and can also polish the slight scratches, so that the main pipe 1 and the branch pipe 2 after cleaning and polishing are smoother and cleaner, and prepare for the subsequent process. In addition, compared with the ceramic steel ball in the prior art, the brown corundum abrasive has the characteristics of high toughness and high strength, and has the characteristics of relatively light weight, high temperature resistance and corrosion resistance. In addition, the brown corundum abrasive can avoid the phenomenon of powdering and bursting during use, thereby greatly improving the safety of the main pipe 1 and the branch pipe 2 during polishing, and improving the reusability of the cleaning auxiliary material and saving manufacturing cost.

[0098] Step five includes:

[0099] Step S51: Put the cleaned main pipe 1 and branch pipe 2 into the vacuum heat treatment furnace for annealing;

[0100] Step S52: Set the heating temperature T and the holding time t2 of the vacuum heat treatment furnace;

[0101] Step S53: Determine whether the main pipe 1 and the branch pipe 2 are cooled to the preset temperature T0 with the furnace, yes, execute step S54; no, return to step S52;

[0102] Step S54: The annealing treatment is completed, and the main pipe 1 and the branch pipe 2 are taken out, and step six is executed; in this embodiment, the specific values of T, t2 and T0 are set according to the requirements;

[0103] Preferably, the heating temperature T is 700-780℃, the holding time t2 is 30-45min, and the main pipe 1 and the branch pipe 2 are taken out when the furnace is cooled to the preset temperature T0 of 200℃. At this time, the hardness of the product end of the main pipe 1 and the branch pipe 2 after annealing treatment should be less than 120HV5.

[0104] Through the setting of step five, the problem of difficult welding caused by the increase of the hardness of the end of the tee main pipe 1 and the branch pipe 2 after the port is pulled out can be effectively avoided, thereby effectively improving the convenience of welding. In addition, the annealing treatment can also improve the toughness and tightness of the main pipe 1 and the branch pipe 2, improve the strength of the main pipe 1 and the branch pipe 2, remove impurities in the main pipe 1 and the branch pipe 2, and improve the quality of the prepared clamp type tee.

[0105] Step six includes:

[0106] Step S61: The main pipe 1 and the branch pipe 2 are welded by using the laser-arc composite welding method to form the required clamp type equal or unequal diameter tee, wherein, as shown in the figure, H is the distance from the end of the branch pipe 2 to the center of the main pipe 1, that is, the distance from the end of the branch pipe 2 to the position where the axial center line of the main pipe 1 is located;

[0107] Step S62: The main pipe 1 and the branch pipe 2 are welded to form a weld 3, and the weld 3 of the clamp-pressing equal-diameter or unequal-diameter tee joint after welding is subjected to non-destructive testing, wherein the non-destructive testing includes radiographic testing and penetration testing of the weld 3, and the detection results should meet the requirements of NB / T 47013.2 "Non-destructive testing of pressure equipment Part 2 Radiographic testing" Level II and NB / T 47013.5 "Non-destructive testing of pressure equipment Part 5 Penetration testing" Level I, respectively;

[0108] The step S61 includes:

[0109] Step S611: Welding preparation: removing surface impurities at the welding position and the edge of the main pipe 1 and the branch pipe 2, wherein the method for removing the surface impurities includes any one or more of mechanical methods and organic solvent cleaning;

[0110] Step S612: Fixing the workpiece and the matching tooling, and demonstrating the laser;

[0111] Step S613: Positioning and welding the main pipe 1 and the branch pipe 2 after assembling the workpiece, and filling protective gas into the main pipe 1 and the branch pipe 2;

[0112] Step S614: Welding strictly according to the requirements of the welding procedure specification;

[0113] Step S615: After welding, checking the surface quality of the weld 3 and the internal excess height of the weld 3, and then executing step S62, wherein the internal excess height of the weld 3 is 0-0.5mm, and the standard for the surface quality of the weld 3 is that the weld 3 and the base material should be smoothly transitioned, and the weld 3 surface is free of defects, wherein the defects include any one or more of cracks, incomplete fusion at the welding position, pores, and welding bumps.

[0114] By using the laser-arc hybrid welding method, additional wire filling can be avoided, and additional machining at the groove is not required. In addition, the heat input to the main pipe 1 and the branch pipe 2 is small, so that the deformation of the main pipe 1 and the branch pipe 2 can be ignored. In addition, the welding method has the characteristics of fast welding speed, high stability of the keyhole, and better weld 3 forming, which can greatly improve the welding quality and the quality of the prepared clamp-pressing equal-diameter or unequal-diameter tee joint, thereby greatly improving the reliability of the manufacturing method.

[0115] Embodiment 1:

[0116] The application has been applied to the manufacture of copper-nickel alloy DN65 equal-diameter clamp-pressing tee joint, and the specific implementation is as follows:

[0117] Step one, blanking: select Φ76.1x2mm copper-nickel alloy seamless pipe material, adopt full-automatic laser cutting pipe, laser cutting pipe has high precision, pipe deformation is small; the length of main pipe 1 and branch pipe 2 is 244±1mm and 77±1mm respectively, remove burrs at the end of main pipe 1 and branch pipe 2 after cutting;

[0118] Step two, forming: evenly smear anti-wear and pressure-resistant oil on the inner and outer surface of 244mm long pipe, i.e. main pipe 1, then put it into end forming machine, form the end into curved surface suitable for clamping and pressing, this part is three-way main pipe 1, the length is 232±1mm; evenly smear anti-wear and pressure-resistant oil on one end of 77mm long pipe, i.e. branch pipe 2, then put the end smeared with anti-wear and pressure-resistant oil into end forming machine, form the end into curved surface suitable for clamping and pressing, this part is three-way branch pipe 2, the length is 71±1mm.

[0119] Step three, main pipe 1 hole pulling: use drilling machine to process an elliptical hole 11 at the center of main pipe 1, the long axis of elliptical hole 11 is parallel to the axis of main pipe 1, wherein the long axis of elliptical hole 11 is 50mm, the short axis of elliptical hole 11 is 15mm, put the main pipe 1 after hole processing on hydraulic machine, put a semicircle ball on elliptical hole 11, pull out the semicircle ball through pressure to form first interface 12, considering the rebound of material deformation, the diameter of semicircle ball needs to be slightly larger than the inner diameter of target first interface 12, the inner diameter of DN65 first interface 12 is 76.1-2x2=72.1mm, the diameter of semicircle ball is Φ72.1+0.9+0.7mm; processing elliptical hole 11 is beneficial to avoid cracks during hole pulling, and is also beneficial to the center finding of pressure ball, put the main pipe 1 after hole pulling on flat machine, process the end of first interface 12 to be flat, the height of processed first interface 12 is 4~5mm.

[0120] Step four, cleaning of main pipe 1 and branch pipe 2: put the main pipe 1 and branch pipe 2 after hole pulling into vibration polisher, add brown corundum abrasive and detergent, remove slight scratches and oil stains on the surface, select spherical brown corundum abrasive, the size of abrasive is 10-20mm; the vibration frequency of polisher is 30Hz / s, the polishing time is 20min.

[0121] Step five, annealing treatment: the hardness of the end of three-way main pipe 1 and branch pipe 2 after hole pulling increases, annealing treatment is needed, put the product into vacuum heat treatment furnace for annealing, the heating temperature is 750±20℃, the holding time is 40min, take out after the furnace is cooled to 100℃. The hardness of the end of product after annealing treatment is 90-100HV5;

[0122] Step six, welding:

[0123] Step S61: adopt laser-arc composite welding method for high-efficiency welding.

[0124] 1) Before welding preparation: the welding position and the surrounding 15mm range are cleaned by mechanical method to remove the surface oxide scale, and the surface is wiped clean with silk cloth dipped with appropriate amount of acetone, and there should be no oil stains and water stains;

[0125] 2) Fix the workpiece and the matching tooling, check whether there is shaking during the rotation of the workpiece, and start the equipment after the check is qualified, and turn on the indicating light for demonstration;

[0126] 3) The laser is in T1 mode for demonstration, and the welding seam 3 is divided into several equal parts for demonstration, each part is about 50mm long, the deformation obvious area is marked and the number of demonstration points is increased, and after the demonstration is completed, the program is run in the mode of turning on the indicating light, whether the movement trajectory deviates from the welding seam 3 is observed and marked;

[0127] 4) In order to prevent the parts from moving during welding, that is, to prevent the main pipe 1 and the branch pipe 2 from moving during welding, positioning welding can be performed after the workpiece is assembled;

[0128] 5) The pipe butt joint of the main pipe 1 and the branch pipe 2 is not beveled, the assembly gap is 0-0.5mm, the positioning welding length is 2-4mm, and the positioning welding interval is 50mm;

[0129] 6) The sleeve pipe, that is, the main pipe 1 and the branch pipe 2, is filled with 99.99% Ar, and the paper adhesive tape is used to block each pipe opening;

[0130] 7) The average power of the laser is 3kW-3.5kW, the welding speed is 600mm / min-1000mm / min, the working distance is 310mm-330mm, the laser pulse is set as square wave, the power peak value is 6-7kW, the base value is 0, the frequency is 100HZ, and the duty cycle is 50-60;

[0131] 8) After welding, the distance between the end of the branch pipe 2 and the center of the main pipe 1 is 113±2mm, and the angle deviation of the branch pipe 2 is ±20';

[0132] 9) The internal excess height of the welding seam 3 is 0-0.5mm;

[0133] 10) After welding, the appearance of the welding seam 3 is checked: the welding seam 3 and the base material should be smoothly transitioned, the welding seam 3 and the heat affected zone surface are free of defects, the defects include any one or more of cracks, incomplete fusion, pores, craters, inclusions, spatters, and the welding seam 3 is free of arc points.

[0134] Step S62: nondestructive testing

[0135] The weld 3 shall be subjected to radiographic testing and penetrant testing, and the results shall meet the requirements of NB / T 47013.2 "Nondestructive Testing of Pressure Equipments Part 2 Radiographic Testing" Class II and NB / T 47013.5 "Nondestructive Testing of Pressure Equipments Part 5 Penetrant Testing" Class I respectively.

[0136] Example 2:

[0137] The application has been applied to the manufacture of the copper-nickel alloy DN80 / DN50 clamp-pressing type reducing tee, and specifically as follows.

[0138] Step one, blanking: select Φ89x2mm and Φ54x1.5 copper-nickel alloy seamless pipe raw materials, adopt full-automatic laser cutting to cut the pipe, the laser cutting pipe has high precision and small pipe deformation, the blanking length of the main pipe 1 is 276±1mm and the length of the branch pipe 2 is 51±1mm, and the burrs at the ends of the main pipe 1 and the branch pipe 2 are removed after cutting.

[0139] Step two, forming: evenly smear the anti-wear and pressure-resistant oil on the inner and outer surfaces of the 274mm-long pipe, i.e. the main pipe 1, then put it into an end forming machine, form the ends into curved surfaces suitable for clamp-pressing, and the length of the main pipe 1 is 262±1mm; evenly smear the anti-wear and pressure-resistant oil on one end of the 50mm-long pipe, i.e. the branch pipe 2, then put the end smeared with the anti-wear and pressure-resistant oil into the end forming machine, form the end into a curved surface suitable for clamp-pressing, and the length of the branch pipe 2 is 44±1mm.

[0140] Step three, main pipe 1 hole pulling: use a drilling machine to process an elliptical hole 11 at the center position of the main pipe 1, and the long axis of the elliptical hole 11 is parallel to the axial direction of the main pipe 1, wherein the long axis of the elliptical hole 11 is 35mm and the short axis of the elliptical hole 11 is 15mm; after the hole is opened, the main pipe 1 is placed on a hydraulic machine, a semicircular ball is placed on the elliptical hole 11, and the semicircular ball is pulled out by pressure to form a first interface 12; considering the rebound of the material after deformation, the diameter of the semicircular ball needs to be slightly larger than the inner diameter of the target first interface 12, the inner diameter of the DN50 first interface 12 is 54-1.5x2=51mm, and the diameter of the semicircular ball is Φ51+0.8+0.6mm; processing the elliptical hole 11 is beneficial to avoid cracks during hole pulling and also beneficial to the pressure ball to find the center; the main pipe 1 after hole pulling is placed on a pipe straightening machine, and the end of the first interface 12 is processed to be flat, and the height of the processed first interface 12 is 4-5mm.

[0141] Step four, cleaning of the main pipe 1 and the branch pipe 2: put the main pipe 1 and the branch pipe 2 after hole pulling into a vibration polisher, add brown corundum abrasive and dishwashing liquid to remove slight scratches and oil stains on the surface; select a spherical brown corundum abrasive, and the size of the abrasive is 10-20mm; the vibration frequency of the polisher is 30Hz / s, and the polishing time is 20min.

[0142] Step five, annealing treatment: the hardness of the end of the tee main pipe 1 and branch pipe 2 after pulling out will increase, and annealing treatment is needed. The product is placed in a vacuum heat treatment furnace for annealing, the heating temperature is 750±20℃, the holding time is 40min, and the product is taken out after the furnace is cooled to 100℃. The hardness of the end of the product after annealing treatment is 90-100HV5;

[0143] Step six, welding:

[0144] Step S61: high-efficiency welding is performed by using the laser-arc hybrid welding method.

[0145] 1) Welding preparation: the welding position and the surrounding 15mm range are cleaned by mechanical method to remove the surface oxide skin, and the surface is cleaned by using silk cloth dipped with appropriate amount of acetone, and there should be no oil stains and water stains left;

[0146] 2) Fix the workpiece and the matching tooling, check whether there is shaking during the rotation of the workpiece, and start the equipment after the check is qualified, and open the indicating light for teaching;

[0147] 3) The laser is in T1 mode for teaching, and the welding seam 3 is divided into several equal parts for teaching, each part is about 50mm long, the positions of the obvious deformation areas are marked and the number of teaching points is increased, and after the teaching is completed, the program is run in the mode of opening the indicating light, and whether the movement trajectory deviates from the welding seam 3 is observed and marked;

[0148] 4) In order to prevent the parts from moving during welding, that is, to prevent the main pipe 1 and the branch pipe 2 from moving during welding, positioning welding can be performed first after the assembly of the workpiece is completed;

[0149] 5) The pipe butt joint of the main pipe 1 and the branch pipe 2 is not beveled, and the assembly gap is 0-0.5mm; the positioning welding length is 2-4mm, and the positioning welding spacing is 50mm;

[0150] 6) The sleeve, that is, the inside of the main pipe 1 and the branch pipe 2 is filled with 99.99% Ar, and the paper adhesive tape is used to block each pipe opening;

[0151] 7) The average power of the laser is 3.5kW-4kW, the welding speed is 600mm / min-1000mm / min, the working distance is 320mm, the laser pulse is set to square wave, the power peak value is 7-8kW, the base value is 0, the frequency is 100HZ, and the duty cycle is 50-60;

[0152] 8) Dimension inspection: the distance between the end of the branch pipe 2 and the center of the main pipe 1 after welding is 93±2mm, and the angle deviation of the branch pipe 2 is ±20';

[0153] 9) The internal excess height range of the welding seam 3 is 0-0.5mm;

[0154] 10) After the welding is completed, the appearance of the weld 3 is checked: the weld 3 and the base material should be smoothly transitioned, the weld 3 and the heat-affected zone surface should be free of defects, including any one or more of cracks, incomplete fusion, pores, craters, inclusions, spatters, and the like, and the weld 3 should be free of arc points.

[0155] Step S62: Non-destructive testing

[0156] The weld 3 should be subjected to radiographic testing and penetrant testing, and the results should meet the requirements of NB / T 47013.2 "Non-destructive Testing of Pressure Equipment Part 2 Radiographic Testing" Class II and NB / T 47013.5 "Non-destructive Testing of Pressure Equipment Part 5 Penetrant Testing" Class I, respectively.

[0157] As can be seen from the above embodiments 1 and 2, the manufacturing method described in the present application can effectively improve the manufacturing of the clamp-pressing equal-diameter or reducing tee joint, and can realize the batch production of the clamp-pressing equal-diameter or reducing tee joint, increase the quality of the clamp-pressing tee joint, improve the efficiency of the clamp-pressing tee joint manufacturing, greatly reduce the cost of manufacturing the clamp-pressing tee joint, and improve the reliability and safety of the manufacturing.

[0158] In the present application, any clamp-pressing tee joint manufacturing technology can include the structure in the copper-nickel alloy clamp-pressing equal-diameter or reducing tee joint manufacturing method described in the present embodiment, and on the basis of the related structure and assembly relationship of the elliptical hole 11 and the clamp-pressing curved surface provided in the present embodiment, the clamp-pressing tee joint also includes conventional components such as the main pipe 1 and the branch pipe 2, which are all prior art and will not be described here.

[0159] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A method for manufacturing a copper-nickel alloy press-fit tee, characterized in that, The method includes the following steps: Step 1, material preparation: According to the type of pipe end of the press-fit tee to be manufactured, copper-nickel alloy seamless pipe is used as raw material to make the main pipe (1) and branch pipe (2). Among them, the pipe end type is divided into press-fit equal diameter tee and press-fit reducing tee. Step 2, Forming: The main pipe (1) and branch pipe (2) are pressed and formed using an end forming machine; Step 3, drawing the main pipe (1): an elliptical hole (11) is machined at the center of the main pipe (1) using a drilling machine. A hemisphere is used to draw the elliptical hole (11) to form the first interface (12), and then the interface is machined using a flat-end machine. The diameter of the hemisphere is d1mm, the inner diameter of the first interface (12) is d2mm, d1=d2+ε, and ε is the inner diameter error coefficient. Step 4: Cleaning of main pipe (1) and branch pipe (2): Clean the main pipe (1) and branch pipe (2) by adding cleaning aids to the vibratory grinder; the cleaning aids include any one or more of brown corundum abrasive and detergent, and the abrasive is spherical; Step 5, Annealing: Anneal the cleaned main pipe (1) and branch pipe (2); Step 6, Welding and Inspection: The main pipe (1) and branch pipe (2) are welded using a laser-arc hybrid welding method, and non-destructive testing is performed. Step four includes: Step S41: Place the main pipe (1) and branch pipe (2) after the end caps are removed into the vibratory grinder and add cleaning materials to the vibratory grinder; Step S42: Set the parameters of the vibratory grinder and perform grinding. Execute step five, wherein the parameters include the grinder vibration frequency f and the grinding time t1.

2. The manufacturing method of a copper-nickel alloy press-fit tee according to claim 1, characterized in that, One of the steps includes: Step S11: Material feeding: The pre-set pipe type of the press-fit tee is press-fit equal diameter tee and press-fit reducing tee; Step S12: Determine whether the pipe type of the required press-fit tee is a press-fit equal diameter tee. If yes, proceed to step S13; otherwise, proceed to step S14. Step S13: Using seamless copper-nickel alloy tubing of the first specification as raw material, the main pipe (1) and branch pipe (2) are obtained by laser cutting. The length of the main pipe (1) is recorded as L mm, and the length of the branch pipe (2) is recorded as h mm. L > h. Then proceed to step two. Step S14: Using seamless copper-nickel alloy pipes of the second and third specifications as raw materials, the main pipe (1) and branch pipe (2) are obtained by laser cutting. The length of the main pipe (1) is recorded as L mm, and the length of the branch pipe (2) is recorded as h mm, where L > h. Then, proceed to step two.

3. The manufacturing method of a copper-nickel alloy press-fit tee according to claim 2, characterized in that, Step two includes: Step S21: Apply anti-wear and pressure-resistant oil to both ends of the main pipe (1) and place the coated main pipe (1) into the end forming machine; Step S22: Perform end forming on both ends of the main tube (1) using an end forming machine; Step S23: Apply anti-wear and pressure-resistant oil to one end of the branch pipe (2) and place the coated branch pipe (2) into the end forming machine; Step S24: Use an end forming machine to form the end of one end of the branch pipe (2); proceed to step three.

4. The manufacturing method of a copper-nickel alloy press-fit tee according to claim 3, characterized in that, Step three includes: Step S31: Drill an elliptical hole (11) at the center of the main pipe (1) using a drilling machine; Step S32: Place the main pipe (1) after the hole is opened on the hydraulic press, and set a hemisphere on the elliptical hole (11); Step S33: Under the pressure of the hydraulic press, the hemisphere is separated from the elliptical hole (11) by the pressure, wherein the hemisphere pulls the elliptical hole (11) to form the first interface (12); Step S34: The end of the first interface (12) is machined by a flat-end machine to make it flat, and then step four is executed.

5. A method for manufacturing a copper-nickel alloy press-fit tee according to claim 4, characterized in that, Step five includes: Step S51: Place the cleaned main pipe (1) and branch pipe (2) into a vacuum heat treatment furnace for annealing; Step S52: Set the heating temperature T and holding time t2 of the vacuum heat treatment furnace; Step S53: Determine whether the main pipe (1) and branch pipe (2) have cooled to the preset temperature T0 with the furnace. If yes, proceed to step S54; otherwise, return to step S52. Step S54: After the annealing process is completed, remove the main pipe (1) and branch pipe (2) and proceed to step six.

6. The manufacturing method of a copper-nickel alloy press-fit tee according to claim 5, characterized in that, Step six includes: Step S61: The main pipe (1) and branch pipe (2) are welded using a laser-arc composite welding method to form the required press-fit equal or different diameter tee; Step S62: Perform non-destructive testing on the weld (3) of the press-fit equal or different diameter tee after welding.

7. A method for manufacturing a copper-nickel alloy press-fit tee according to claim 6, characterized in that, Step S61 includes: Step S611: Welding preparation: Remove surface impurities from the welding positions and edges of both the main pipe (1) and the branch pipe (2); Step S612: Fix the workpiece and its fixtures, and teach the laser. Step S613: After the workpiece assembly is completed, the main pipe (1) and branch pipe (2) are fixed by positioning welding, and protective gas is filled into the main pipe (1) and branch pipe (2); Step S614: Perform welding according to the process specifications; Step S615: After welding is completed, check the surface quality of weld (3) and the internal reinforcement of weld (3) to ensure they are qualified, then proceed to step S62.

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