CN112916998A - Deep hole structure repairing method based on friction plunger welding and stopper rod applied by same - Google Patents
Deep hole structure repairing method based on friction plunger welding and stopper rod applied by same Download PDFInfo
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- CN112916998A CN112916998A CN202110138237.6A CN202110138237A CN112916998A CN 112916998 A CN112916998 A CN 112916998A CN 202110138237 A CN202110138237 A CN 202110138237A CN 112916998 A CN112916998 A CN 112916998A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
- B23K20/1215—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding for other purposes than joining, e.g. built-up welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
- B23K20/122—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding
- B23K20/128—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding making use of additional material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/24—Preliminary treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
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Abstract
The invention provides a deep hole structure repairing method based on friction plug welding and a plug rod applied by the method. The repairing method comprises the following steps: removing the internal damage of the hole structure and processing hole plugging; obtaining a stopper rod, and installing the stopper rod at the output end of the friction plug repair welding equipment; the stopper rod rotates and descends into the plug hole, the bottom surface of the stopper rod is contacted and rubbed with the bottom of the plug hole, along with the continuous downward feeding of the stopper rod, the contact surface of the stopper rod is continuously converted into a flowable thermoplastic material and is filled between the stopper rod and the plug hole, and the friction plug repair welding equipment stops rotating and continuously applies downward top forging pressure to the stopper rod so as to form a solid-phase connected welding seam; and re-processing the deep hole structure at the position of the welding seam. The friction plug welding process is adopted, and the internal damaged hole structure is repaired in a solid phase connection mode, so that the mechanical property of the hole structure can be enhanced, the service life is prolonged, and the friction plug welding process is suitable for various hole structures, in particular for deep hole structures.
Description
Technical Field
The invention relates to the technical field of mechanical welding and additive repair, in particular to a deep hole structure repair method based on friction plug welding and a plug rod applied to the method.
Background
Threaded connections are one of the most common methods used in mechanical connections, where the internal and external threads are complex to apply force and deform after making up the connection, and the external threaded component often fails in fatigue before the internal threaded component under alternating loads, particularly in the harsh environment of repeated tension. In the advanced maintenance process, the defects of the threaded holes can be mainly divided into five types of characteristics: firstly, the screw teeth deform, and the screw teeth generate permanent plastic deformation due to unreasonable stress of the threaded holes; second, cracks, machining or material defects propagate damage to form cracks; thirdly, a gap and a thread crest are cracked and lost; fourthly, corrosion is carried out, and the thread generates new phases under the chemical action of corresponding environment media so as to fail; and fifthly, scratching is mainly influenced by the deformation of screw threads of the bolts, inclusion of hard matters or corrosion and the like, and scratching damage is caused in a screwing-in and screwing-out path in the process of disassembly or assembly. The rail transit equipment has a large number of threaded holes and deep hole structures, and the structures cause damage such as threaded hole abrasion, tooth mouth fracture and the like due to vibration and corrosion in the running process of a vehicle or repeated overhauling and disassembly, so that the whole parts are scrapped. The traditional repairing methods comprise methods of embedding a steel wire threaded sleeve, welding and plugging, brazing and the like, but all have the problem of reliability. In particular, the welding and plugging process is easy to cause the performance deterioration and deformation of the base material due to large heat influence, and the reliability of the whole parts is reduced. For example, in the manufacturing and maintenance processes of high-speed motor car parts, the threads need to be repeatedly disassembled and assembled, the thread damage condition of the threaded hole is continuously found during thread maintenance, and in order to ensure the safe operation of a vehicle, the damaged threaded hole is repaired by adopting the process of repairing the threaded hole after reaming and then re-processing the threads.
The friction plunger welding is a solid phase connection technology, can realize defect repair and connection of iron-based alloy, nonferrous metal and alloy, generates heat through friction in the welding process, has the welding temperature lower than the melting point of materials, has extremely low welding thermal stress and residual stress, has compact joint tissues and is not easy to generate defects, has wide application prospect, and particularly has great development potential in the fields of aerospace, rail transit, ships and the like. The friction plug welding is suitable for repairing the surface defects of the hole structure, and is different from the traditional defect repairing method of fusion welding: the traditional fusion welding method is not suitable for repairing the defect deeply buried under the surface of a workpiece due to high heat input and difficult control, the friction plug welding can be used for repairing the defect at a deeper position, and the defect repair quality is higher due to the solid connection, so that the joint performance can not be obviously deteriorated.
The friction plunger welding needs to process a plug hole at a defect position, a plug rod fixed on a main shaft of a welding machine rotates at a high speed, meanwhile, the plug rod feeds into the plug hole, the main shaft stops rotating at the moment of feeding completion, and upsetting pressure with a certain magnitude is applied and load is preserved. The friction plunger welding process has higher requirement on the rigidity of equipment, and the power provided by the main shaft is large enough to ensure that the coaxiality of the plunger and the plug hole is not influenced in the plunger feeding stage. Therefore, how to repair deep hole structures such as threaded holes by friction plunger welding is an urgent technical problem to be solved.
Disclosure of Invention
The invention provides a deep hole structure repairing method based on friction plunger welding and a stopper rod applied to the method, and aims to solve the problem that in the prior art, the repairing reliability of deep hole structures such as threaded holes is poor.
The invention provides a deep hole structure repairing method based on friction plug welding, which comprises the following steps:
s1, removing internal damage of the deep hole structure to be repaired, and processing the deep hole structure into a plug hole for solid phase filling;
s2, obtaining a stopper rod matched with the contour of the stopper hole;
s3, fixing the deep hole structure to be repaired, and installing the stopper rod at the output end of the friction stopper repair welding equipment;
s4, the stopper rod is driven by the friction plug repair welding device to rotate and descend into the plug hole, the bottom surface of the stopper rod is in contact with and rubs against the bottom of the plug hole, the contact surface of the stopper rod is continuously transformed into a flowable thermoplastic material and filled between the stopper rod and the plug hole along with the continuous downward feeding of the stopper rod, and the friction plug repair welding device stops rotating and continuously applies downward top forging pressure to the stopper rod so as to form a solid-phase connected welding seam;
and S5, removing the stopper rod and the generated flash, and re-processing the deep hole structure at the position of the welding seam.
According to the deep hole structure repairing method based on friction plunger welding, the size of the obtained stopper rod meets the requirement that the side wall of the stopper rod is in clearance fit with the side wall of the plug hole.
According to the deep hole structure repairing method based on friction plug welding, provided by the invention, the material of the deep hole structure to be repaired is steel, aluminum alloy or cast iron.
According to the deep hole structure repairing method based on friction plug welding provided by the invention, the deep hole structure to be repaired comprises a threaded hole, a pin hole or a hole structure with a tooth mouth.
According to the deep hole structure repairing method based on friction plug welding, provided by the invention, the depth range of the deep hole structure to be repaired is 20-150 mm, and the diameter range is 10-25 mm.
According to the deep hole structure repairing method based on friction plug welding, in step S4, the rotating speed of the plug rod is 5000-8000 rpm, the consumption height of the contact surface of the plug rod is 5-20 mm, the time of the upsetting and pressing process is 3-30 seconds, the pressure applied by friction plug repair welding equipment during plug rod welding is 20-60kN, and the upsetting pressure applied to the plug rod is 20-80 kN.
According to the deep hole structure repairing method based on friction plug welding, in step S3, the method further comprises the steps of positioning the axis of the plug hole by using an edge finder, and driving the plug rod to be coaxial with the plug hole by using the friction plug repair welding equipment.
The invention also provides a stopper rod, which is applied to the deep hole structure repairing method based on friction plug welding, and comprises the following steps:
the top of the rod body is provided with a clamping part used for clamping the friction plug repair welding equipment, the middle of the rod body is provided with a transition section, the bottom of the rod body is provided with a consumption section, and the diameter of the consumption section is smaller than the inner diameter of the plug hole.
According to the stopper rod provided by the invention, the transition section is constructed into a cone, and the end part of the consumption section is constructed into a circular truncated cone shape.
According to the stopper rod provided by the invention, the bottom of the consumption section is configured with a transition fillet with the radius smaller than 3 mm.
According to the friction plunger welding-based deep hole structure repairing method and the plunger rod applied by the method, the friction plunger welding process is adopted, the hole structure with internal damage is repaired in a solid-phase connection mode, the repaired welding seam position has the advantages of small welding deformation, low residual stress after welding, good welding seam performance, no defects and the like, the functional hole structure is re-processed in the welding seam area, the mechanical property of the hole structure can be enhanced, the service life is prolonged, and the method is suitable for various hole structures, and is particularly suitable for the deep hole structure.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic repairing diagram in step 1 of a deep hole structure repairing method based on friction plug welding provided by the invention;
FIG. 2 is a schematic diagram of a hole plugging structure after step 1 of the deep hole structure repairing method based on friction plug welding provided by the invention is completed;
FIG. 3 is a schematic structural diagram of a plug rod entering the interior of a plug hole in step 4 of the deep hole structure repairing method based on friction plug welding provided by the invention;
FIG. 4 is a schematic structural diagram of a continuous downward feeding of a stopper rod in step 4 of the deep hole structure repairing method based on friction plug welding provided by the invention;
FIG. 5 is a schematic structural diagram of the deep hole structure repairing method based on friction plug welding, in which the contact surface of the plug rod in step 4 is transformed into a flowable thermoplastic material and is filled between the plug rod and the plug hole;
FIG. 6 is a schematic repairing diagram in step 5 of the deep hole structure repairing method based on friction plug welding provided by the invention;
FIG. 7 is a schematic diagram of a hole structure after completion of repair in step 5 of the deep hole structure repair method based on friction plug welding provided by the invention;
FIG. 8 is a schematic view of the structure of a stopper rod provided by the present invention;
FIG. 9 is a schematic cross-sectional view A-A of FIG. 8;
reference numerals:
1: milling cutters; 2: a screw tap; 3: a workpiece;
4: plugging the hole; 5: a stopper rod; 51: a clamping portion;
52: a transition section; 53: and (4) a consumption section.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The method for repairing a deep hole structure based on friction plug welding according to the present invention is described below with reference to fig. 1 to 9, and includes:
and S1, removing the internal damage of the deep hole structure to be repaired, and processing the deep hole structure into a plug hole 4 for solid phase filling. In step S1, as shown in fig. 1 and 2, the internal damage of the hole-like structure in the workpiece 3 may be removed and processed into the tap hole 4 by using a tool such as a milling cutter 1 or a tap 2, or the damaged portion may be removed and processed by using another machine.
And S2, obtaining the stopper 5 matched with the contour of the stopper hole 4. In step S2, as shown in fig. 8 and 9, the stopper rod 5 may be machined or selected to a suitable size to ensure it matches the tap hole 4.
S3, fixing the deep hole structure to be repaired by using a tool, installing the stopper rod 5 at the output end of friction plug repair welding equipment (a friction welding machine and the like can be adopted), and adjusting the position of the stopper rod 5 to enable the stopper rod to coincide with the axis of the plug hole 4. In step S3, a driving force is provided by the friction plug repair welding device to drive the stopper rod 5 to feed and rotate downward so as to contact and rub the stopper rod with the plug hole, the edge finder is used to position the axis of the plug hole 4, and the friction plug repair welding device is used to drive the stopper rod 5 to be coaxial with the plug hole 4. After centering, the horizontal positions of the plug hole 4 and the plug rod 5 are kept unchanged, and only the vertical displacement of the plug rod 5 is adjusted, so that only one centering is needed before welding is started.
S4, the stopper rod 5 is driven by the friction plug repair welding device to rotate and slowly descend into the plug hole 4 (shown in figure 3), the bottom surface of the stopper rod 5 is contacted and rubbed with the bottom of the plug hole 4 (shown in figure 4), the contact surface of the stopper rod 5 is continuously transformed into flowable thermoplastic material and filled between the stopper rod 5 and the plug hole 4 as the stopper rod 5 is continuously fed downwards, and the friction plug repair welding device stops rotating and continuously applies downward upsetting pressure to the stopper rod 5 so as to form a solid-phase connected welding seam (shown in figure 5). In step S4, the friction plug repair welding device drives the stopper 5 to move in three stages: 1. a contact stage of the plug rod 5 and the plug hole 4; 2. a stable welding stage; 3. and (5) upsetting. Specifically, the stopper 5 is placed in the plug hole 4 under the drive of the friction plug repair welding apparatus, when the stopper 5 reaches the bottom of the plug hole 4, the bottom of the stopper 5 is in contact with the plug hole 4, and under the rotary drive and pressure of the friction plug repair welding apparatus, the contact surface of the stopper 5 reaches a thermoplastic state due to heat generated by friction, and is continuously fed downward as the stopper 5 until the gap between the stopper 5 and the plug hole 4 is completely filled with the thermoplastic material. It should be understood that in this step, whether the stopper 5 is transformed into the thermoplastic state can be judged by the stopper 5 feeding length, that is, when the stopper 5 can be fed downward, the bottom material thereof is proved to be consumed, so that it is known that the bottom material of the stopper 5 is transformed into the thermoplastic material to be filled in the gap between the stopper 5 and the plug hole 4 at this time.
And S5, removing the stopper 5 and the generated flash, and re-processing the deep hole structure at the position of the welding seam. In step S5, as shown in fig. 6 and 7, the redundant stopper 5 and the flash are removed by machining, and the deep hole structure can be remachined by using the tools such as the milling cutter 1 and the tap 2.
The hole structure repaired by the repairing method has higher mechanical property and fatigue property, taking the M16 threaded hole processed after the Q345 steel matrix is repaired as an example, the tensile strength can reach 550-600MPa, the yield strength can reach 380-420MPa, the elongation can reach 20-30%, and the impact toughness at the temperature of minus 20 ℃ can reach 20-50J; under the conditions of 140MPa and 0.1 stress ratio, the fatigue life of the composite material is more than 10000000 times under the condition of using 12.9-grade bolt connection; under the experimental condition of a higher stress range, the 12.9-grade bolt is subjected to fatigue fracture, the repaired internal thread is not damaged, and the internal thread after the bolt is replaced can still ensure the stable and reliable connection effect.
According to the friction plunger welding-based deep hole structure repairing method and the stopper rod 5 applied by the method, the friction plunger welding process is adopted, the hole structure with internal damage is repaired in a solid-phase connection mode, the repaired welding seam position has the advantages of small welding deformation, low residual stress after welding, good welding seam performance, no defects and the like, the functional hole structure is re-processed in the welding seam area, the mechanical property of the hole structure can be enhanced, the service life is prolonged, and the method is suitable for various hole structures, and is particularly suitable for the deep hole structure.
In one embodiment, the obtained size of the stopper rod 5 satisfies the condition that the side wall of the stopper rod 5 is in clearance fit with the side wall of the plug hole 4, and the clearance between the stopper rod 5 and the plug hole 4 can ensure that the stopper rod 5 can be smoothly fed, so that the stopper rod 5 is prevented from touching the side wall of the plug hole 4 before high-speed rotation, which would affect the final weld forming or generate defective connection.
In one embodiment, the material of the deep-hole structure repaired by the friction plug welding-based deep-hole structure repairing method is steel, aluminum alloy or cast iron.
In one embodiment, the hole-like structure repaired by the deep hole structure repairing method based on friction plug welding comprises but is not limited to a straight hole-like structure such as a threaded hole, a pin hole or a tapped hole structure.
In one embodiment, the depth range of the hole structure repaired by the deep hole structure repairing method based on friction plug welding is 20-150 mm, and the diameter range is 10-25 mm.
In one embodiment, in step S4, the stopper rod 5 is driven by a friction plug repair welding device to rotate at 5000-8000 rpm; the consumption height of the contact surface of the stopper rod 5 from the beginning to the end of welding is 5-20 mm; the upsetting and pressing process time is 3-30 seconds under the action of the friction plug repair welding equipment; the pressure applied by the friction plug repair welding equipment in the stable welding stage is 20-60kN, and the upsetting pressure applied by the friction plug repair welding equipment to the stopper rod 5 in the upsetting stage is 20-80 kN.
As shown in fig. 8 and 9, the present invention further provides a stopper rod 5, and the stopper rod 5 is applied to the deep hole structure repairing method based on friction plug welding of the present invention, and the stopper rod 5 includes:
the top of the rod body is provided with a clamping part 51 for clamping the friction plug repair welding equipment, the middle of the rod body is provided with a transition section 52, the bottom of the rod body is provided with a consumption section 53, and the diameter of the consumption section 53 is smaller than the inner diameter of the plug hole 4; the surface roughness Ra of the rod body is less than or equal to 3.2.
In the embodiment, the holding part 51 of the top structure of the rod body is a pair of grooves, and the output end of the friction plug repair welding device can be held and locked in the grooves, so that the transmission of pressure and torque is realized; the transition section 52 is a region with gradually reduced outer diameter, and the diameter of the consumption section 53 at the lower part of the transition section is ensured to be smaller than the inner diameter of the plug hole 4, so that deformation or fracture is avoided in the feeding process; the end surface of the consumption section 53 is used to generate heat by friction with the bottom surface of the tap hole 4, so that the consumption section 53 becomes thermoplastic and fills in the gap between the tap hole 4 and the stopper rod 5, thereby forming a weld of solid phase connection.
The stopper rod 5 adopted by the invention is suitable for the friction plug welding-based deep hole structure repairing method, the stopper rod 5 is connected with friction plug repair welding equipment through the clamping part 51, the transition of the transition section 52 ensures that the consumed section 53 of the stopper rod 5 is matched with the size of the stopper hole 4, and the friction between the consumed section 53 of the stopper rod 5 and the bottom surface of the stopper hole 4 generates heat, so that the consumed section 53 is changed into a thermoplastic state and is filled in a gap between the stopper hole 4 and the stopper rod 5, and a solid-phase connected welding seam is formed. Through the cooperation of stopper 5 and consent 4, can restore the internal damage of pore class structure, can strengthen the mechanical properties of pore class structure, increase of service life.
Further, the transition section 52 is configured as a cone, and the end of the consumption section 53 is configured as a truncated cone.
Furthermore, the bottom of the consumption section 53 is configured with a transition fillet with a radius smaller than 3mm, and the transition fillet can ensure that the size of the tail end of the stopper rod 5 and the bottom of the plug hole 4 are smoothly matched, so that the initial friction heat production process is stable.
Taking the repair of the threaded hole as an example, the repair method comprises the following steps:
the method comprises the following steps: removing the damaged part of the threaded hole, and processing a plug hole for repairing at the position of the damaged threaded hole;
step two: processing and selecting a stopper rod matched with the size of the plug hole for repairing;
step three: fixing the workpiece with the repairing plug hole on a welding tool; the plug rod matched with the plug hole is fixed on a main shaft of the welding machine, and the main shaft of the welding machine is operated to adjust the position of the plug rod so that the axial center line of the plug rod is superposed with the axial center line of the plug hole and has the same axle center;
step four: operating the welding machine to enable the stopper rod to rotate at a high speed to a stable stage and slowly descend to enter the stopper hole;
step five: the bottom surface of the stopper rod is in contact with the bottom of the stopper hole and then is rubbed, and the generated heat enables the material of the contact interface of the stopper rod to reach a thermoplastic state; the stopper rod continues to be fed down the axis until the space between the stopper hole and the stopper rod is completely filled with thermoplastic material;
step six: stopping the main shaft, and simultaneously applying upset forging pressure with a certain magnitude downwards along the axial direction of the stopper rod and keeping for a period of time;
step seven: stopping the welding process, taking out the plug hole and the plug rod which are connected together and finish the upset welding, and removing redundant plug rods and generated flashes;
step eight: and (4) re-processing a new threaded hole at the position of the repair welding seam after repair.
In the welding process, the coaxiality of the stopper rod and the plug hole needs to be ensured, and a certain load is ensured to be applied downwards along the axial direction of the stopper rod and is also ensured during upsetting, so that the requirements on the rigidity, the stability and the power of welding equipment are higher.
In this example, the welding process parameters included a stopper rod rotation speed of 6000rpm, a welding pressure of 30kN, an upset pressure of 45kN, and an upset time of 5 s. The consumption of the stopper rod, the welding pressure and the upsetting pressure are related to the depth of the threaded hole to be repaired, and if the depth of the threaded hole to be repaired is increased, the consumption of the stopper rod, the welding pressure and the upsetting pressure need to be correspondingly increased; the material of the stopper rod is preferably selected to be the same as the material of the workpiece with the nozzle.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A deep hole structure repairing method based on friction plug welding is characterized by comprising the following steps:
s1, removing internal damage of the deep hole structure to be repaired, and processing the deep hole structure into a plug hole for solid phase filling;
s2, obtaining a stopper rod matched with the contour of the stopper hole;
s3, fixing the deep hole structure to be repaired, and installing the stopper rod at the output end of the friction stopper repair welding equipment;
s4, the stopper rod is driven by the friction plug repair welding device to rotate and descend into the plug hole, the bottom surface of the stopper rod is in contact with and rubs against the bottom of the plug hole, the contact surface of the stopper rod is continuously transformed into a flowable thermoplastic material and filled between the stopper rod and the plug hole along with the continuous downward feeding of the stopper rod, and the friction plug repair welding device stops rotating and continuously applies downward top forging pressure to the stopper rod so as to form a solid-phase connected welding seam;
and S5, removing the stopper rod and the generated flash, and re-processing the deep hole structure at the position of the welding seam.
2. The friction plug welding-based deep hole structure repairing method according to claim 1, wherein the obtained size of the plug rod is such that a clearance fit exists between the side wall of the plug rod and the side wall of the plug hole.
3. The friction plug welding-based deep-hole structure repairing method according to claim 1, wherein the material of the deep-hole structure to be repaired is steel, aluminum alloy or cast iron.
4. The friction plug welding-based deep-hole structure repairing method according to claim 1, wherein the deep-hole structure to be repaired comprises a threaded hole, a pin hole or a tapped hole structure.
5. The friction plug welding-based deep hole structure repairing method is characterized in that the depth range of the deep hole structure to be repaired is 20-150 mm, and the diameter range of the deep hole structure to be repaired is 10-25 mm.
6. The friction plug welding-based deep hole structure repairing method is characterized in that in step S4, the rotating speed of the plug rod is 5000-8000 rpm, the consumption height of the contact surface of the plug rod is 5-20 mm, the upsetting and pressing process time is 3-30 seconds, the pressure applied by the friction plug repair welding equipment during the plug rod welding is 20-60kN, and the upsetting pressure applied to the plug rod is 20-80 kN.
7. The friction plug welding-based deep hole structure repairing method according to claim 1, wherein in step S3, the method further comprises positioning the axial center of the plug hole by using an edge finder, and driving the plug rod to be coaxial with the plug hole by using the friction plug repair welding equipment.
8. A stopper rod applied to a friction plug welding based deep hole structure repairing method according to any one of claims 1 to 7, the stopper rod comprising:
the top of the rod body is provided with a clamping part used for clamping the friction plug repair welding equipment, the middle of the rod body is provided with a transition section, the bottom of the rod body is provided with a consumption section, and the diameter of the consumption section is smaller than the inner diameter of the plug hole.
9. Stopper rod according to claim 8, wherein the transition section is configured as a cone and the end of the consumption section is configured as a truncated cone.
10. Stopper rod according to claim 8, wherein the bottom of the consumption segment is configured with a transition fillet with a radius of less than 3 mm.
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| CN114102048A (en) * | 2021-10-23 | 2022-03-01 | 国营芜湖机械厂 | Method for repairing cracks of outer cylinder of actuator cylinder |
| CN114310144A (en) * | 2021-12-24 | 2022-04-12 | 中车永济电机有限公司 | Friction plug welding repair method for nodular cast iron screw hole |
| CN114346597A (en) * | 2021-12-17 | 2022-04-15 | 国营芜湖机械厂 | Remanufacturing and repairing process for aluminum alloy filter screen bracket of aircraft fuel electric pump |
| CN114682902A (en) * | 2022-04-07 | 2022-07-01 | 中南大学 | Friction repairing method |
| CN115476030A (en) * | 2022-08-26 | 2022-12-16 | 国营四达机械制造公司 | Internal thread friction stir welding repair processing method |
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| CN114346597B (en) * | 2021-12-17 | 2023-04-14 | 国营芜湖机械厂 | Remanufacturing and repairing process for aluminum alloy filter screen bracket of aircraft fuel electric pump |
| CN114310144A (en) * | 2021-12-24 | 2022-04-12 | 中车永济电机有限公司 | Friction plug welding repair method for nodular cast iron screw hole |
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| CN115722787A (en) * | 2022-09-05 | 2023-03-03 | 天津大学 | Joint structure and friction preheating quick drawing type friction plug repair welding method |
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