CN112372428B - Steel pipe circumferential weld inner burr grinding device and grinding method thereof - Google Patents
Steel pipe circumferential weld inner burr grinding device and grinding method thereof Download PDFInfo
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- CN112372428B CN112372428B CN202011270687.2A CN202011270687A CN112372428B CN 112372428 B CN112372428 B CN 112372428B CN 202011270687 A CN202011270687 A CN 202011270687A CN 112372428 B CN112372428 B CN 112372428B
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- steel pipe
- circumferential weld
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
- B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
- B24B9/04—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of metal, e.g. skate blades
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
- B24B1/002—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes using electric current
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B27/00—Other grinding machines or devices
- B24B27/0007—Movable machines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/02—Frames; Beds; Carriages
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/04—Headstocks; Working-spindles; Features relating thereto
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B47/00—Drives or gearings; Equipment therefor
- B24B47/10—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces
- B24B47/12—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces by mechanical gearing or electric power
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B47/00—Drives or gearings; Equipment therefor
- B24B47/10—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces
- B24B47/14—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces by liquid or gas pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B47/00—Drives or gearings; Equipment therefor
- B24B47/22—Equipment for exact control of the position of the grinding tool or work at the start of the grinding operation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
- B24B49/12—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation involving optical means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
Abstract
The invention relates to a steel pipe circumferential weld inner burr grinding device and a grinding method thereof, and the device comprises a frame unit, a linear moving unit, a linear sliding table, a lifting unit, a rotary driving unit, a high-pressure air pump, a high-pressure air jetting disc, a grinding wheel and a mounting and holding unit, wherein the linear moving unit is arranged on a vehicle body, the lifting unit is arranged on the linear sliding table, the rotary driving unit is arranged on a lifting platform, the high-pressure air pump, the high-pressure air jetting disc, the grinding wheel and the mounting and holding unit are all arranged on a rotating shaft of the rotary driving unit, the high-pressure air pump is close to the lifting platform, and the high-pressure air jetting disc, the grinding wheel and. According to the invention, the pulse current is adopted to assist in grinding the inner burrs at the circumferential weld of the steel pipe, so that the plasticity resistance of the inner burrs at the circumferential weld of the steel pipe is reduced, the service life of the grinding wheel is prolonged, the grinding cost is reduced, meanwhile, the tips of the inner burrs rapidly melt and fill cracks at the circumferential weld of the steel pipe by the high-frequency pulse current, and the welding quality and the grinding quality of the inner burrs at the circumferential weld of the steel pipe are improved.
Description
Technical Field
The invention belongs to the technical field of steel pipe inner burr grinding, and particularly relates to a steel pipe circumferential weld inner burr grinding device and a grinding method thereof.
Background
The steel pipe is an important component in the modern manufacturing industry and the transportation industry, a plurality of steel pipes are required to be welded due to the limitation of the length of the steel pipe and the different purposes of the steel pipe in the actual use process, so that the steel pipe can meet the relevant requirements, but inner burrs with different shapes are generated at the ring welding part of two mutually welded steel pipes, and the grinding wheel is seriously damaged during grinding due to the difference of the shapes and the sizes of the inner burrs, so that the service life of the grinding wheel is greatly reduced; and cracks are generated at the welded part, and the cracks are not only the most common one of the welding defects, but also the most destructive one. When a welded joint containing cracks is subjected to external load, stress concentration can be generated at the crack tip, the stress concentration can seriously reduce the overall mechanical property of the welded joint and even can cause sudden fracture, and in addition, tiny cracks in the welded joint can gradually expand under the action of external dynamic load and finally cause the joint to fail due to fatigue fracture, and finally the operation of related projects and production activities is seriously influenced.
The influence caused by the inner burrs can be solved by grinding the inner burrs of the circumferential weld of the steel pipe, but the service life of the grinding wheel can be greatly shortened by the traditional grinding method, the grinding efficiency is low, the replacement frequency of the grinding wheel is high, cracks exist on the ground surface after grinding is completed, the stress at the welding position is insufficient, and the requirement of the market on high-quality welding of the steel pipe cannot be met. However, the pulse current has different requirements on whether the pulse current is applied to the inner burrs with different shapes and the magnitude of the applied pulse current, because the inner burrs with smaller widths can cause point discharge and serious damage to the grinding wheel if the pulse current is applied to the inner burrs; on the other hand, after the inner burrs are ground, due to the existence of a grinding device and errors, the inner burrs with a certain height still exist on the inner wall of the steel pipe circumferential weld, cracks can exist around the inner burrs, and the existence of the inner burrs and the cracks can influence the efficiency of the steel pipe in gas and liquid transportation.
Disclosure of Invention
Aiming at the situation, the invention provides a steel pipe circumferential weld inner burr grinding device and a grinding method thereof, which apply pulse current to a steel pipe circumferential weld, reduce the plasticity resistance of the inner burr at the steel pipe circumferential weld, improve the grinding efficiency and the grinding quality of the inner burr at the steel pipe circumferential weld, further improve the service life of a grinding wheel, reduce the cost, reduce and eliminate inner burrs and cracks at the steel pipe circumferential weld due to grinding errors of a grinding device and the grinding by stronger pulse current, and improve the welding quality and the grinding quality at the steel pipe circumferential weld.
The invention adopts the technical scheme that the device for grinding the inner burrs of the circumferential weld of the steel pipe comprises a frame unit, a linear moving unit, a linear sliding table, a lifting unit, a rotary driving unit, a high-pressure air pump, a high-pressure air jetting disc, a grinding wheel and a holding unit, wherein the frame unit comprises a vehicle body, universal wheels, a numerical control table, a pulse power supply and a temperature feedback system, the universal wheels are arranged at the bottom of the vehicle body, a manual pushing hand is arranged at the first end of the vehicle body, the numerical control table, the pulse power supply and the temperature feedback system are all arranged on the vehicle body, and the numerical control table and the pulse power supply as well as the numerical control table and the temperature feedback system are all connected and communicated through connecting wire harnesses; the linear moving unit is arranged in the middle of the vehicle body, the lifting unit is arranged on the linear sliding table and comprises hydraulic oil cylinders and a lifting platform, the hydraulic oil cylinders are uniformly distributed at the corners of the linear sliding table, the first ends of the hydraulic oil cylinders are fixedly connected with the linear sliding table, and the second ends of the hydraulic oil cylinders are fixedly connected with the lifting platform; the lifting platform is provided with the rotary driving unit, the rotary driving unit comprises a rotary shaft, a bearing seat, a driven gear, a rotary motor, a second supporting seat and a driving gear, the rotary shaft is a hollow shaft, the rotary shaft is supported in the middle of the lifting platform through the bearing seat, the driven gear is arranged at the first end of the rotary shaft, the rotary motor is fixedly arranged on the lifting platform through the second supporting seat, an output shaft of the rotary motor is connected with the driving gear through a coupler, and the driving gear is in meshing transmission with the driven gear; the high-pressure air pump, the high-pressure air jet disc, the grinding wheel and the holding unit are all arranged on the rotating shaft, the high-pressure air pump is close to the lifting platform, the high-pressure air injection disc, the grinding wheel and the mounting and holding unit are all positioned at the second end of the rotating shaft, the high-pressure air pump is communicated with the high-pressure air jet disc through a high-pressure vent pipe arranged on the outer side of the rotating shaft in a surrounding way, and the outer cambered surface of the high-pressure air injection disc is uniformly provided with high-pressure nozzles, the high-pressure air injection disc is positioned on the right side of the grinding wheel, the left side of the grinding wheel is provided with the holding unit, the holding unit comprises a holding disc and a detection connector, the holding disc is connected with the numerical control table through a connecting wire harness, the detection connectors are uniformly distributed on the cambered surface on the outer side of the holding disc, the first end surface of each detection connector is provided with a pulse electrode, and the first side surface and the second side surface of the detection connector are respectively provided with a binocular camera and an infrared temperature measuring head.
Further, the linear motion unit includes lead screw, first supporting seat, linear electric motor, guide rail, slider, connecting plate and screw, the first end of lead screw pass through the bearing support in on the first supporting seat, just the second end of lead screw pass through the shaft coupling with linear electric motor's output shaft, the guide rail is located respectively on the automobile body, the slider is located the first terminal surface of sharp slip table, just department is equipped with in the middle of sharp slip table bottom the connecting plate, the screw is located on the connecting plate, just the slider with guide rail sliding connection, the screw with screw drive connects.
Preferably, a bearing block is arranged in the middle of the lifting platform.
Preferably, the axial distance between the high-pressure air injection disc and the grinding wheel ranges from 4mm to 6 mm.
Preferably, the first end face of the grinding wheel coincides with the first end face of the holding disc.
Preferably, one side of sharp slip table is equipped with lift control switch, just lift control switch includes pressure boost button, decompression button and pressurize button.
In another aspect of the present invention, a grinding method for a steel pipe circumferential weld inner burr grinding device is provided, which includes the following steps:
s1, moving the frame unit to a steel pipe grinding station;
s2, controlling the hydraulic oil cylinder to lift, so that the central axis of the rotating shaft coincides with the central axis of the steel pipe;
s3, starting the linear motor to drive the linear sliding table to move forwards, so that the mounting and holding unit is aligned with the end face of the circumferential weld of the steel pipe;
s4, starting the rotating motor, feeding back the real-time form of the steel pipe circumferential weld to the numerical control console through the binocular camera, judging whether the end face width of the inner burr of the steel pipe circumferential weld is larger than 2mm, executing the step S5 when the end face width of the inner burr of the steel pipe circumferential weld is larger than 2mm, and executing the step S6 when the end face width of the inner burr of the steel pipe circumferential weld is smaller than 2 mm;
s5, switching on the pulse electrode power supply, and applying pulse current to the circumferential weld of the steel pipe;
s6, starting the linear motor to drive the linear sliding table to move forwards continuously, so that the grinding surface of the grinding wheel is aligned with the end surface of the steel pipe circumferential weld;
s7, starting the rotating motor, and grinding the circumferential weld of the steel pipe;
s8, feeding back the temperature of the steel pipe circumferential weld to the numerical control table in real time through the infrared temperature measuring head, judging whether the temperature of the steel pipe circumferential weld is higher than 600 ℃, starting the high-pressure air pump when the temperature of the steel pipe circumferential weld is higher than 600 ℃, and introducing high-pressure air with the pressure of 40MPa into the high-pressure air injection disc, and starting the high-pressure air pump when the temperature of the steel pipe circumferential weld is lower than 600 ℃ and introducing high-pressure air with the pressure of 30MPa into the high-pressure air injection disc;
s9, judging whether the height of the inner burrs at the steel pipe circumferential weld is larger than 0.4mm or not, executing the step S7 when the height of the inner burrs at the steel pipe circumferential weld is larger than 0.4mm, and executing the step S10 when the height of the inner burrs at the steel pipe circumferential weld is smaller than 0.4 mm;
s10, stopping introducing high-pressure gas into the high-pressure gas injection disc;
s11, starting the linear motor to drive the linear sliding table to move backwards, so that the mounting and holding unit is aligned with the end face of the circumferential weld of the steel pipe;
and S12, switching on the pulse electrode power supply, and applying pulse current to the steel pipe circumferential weld joint to heat and melt the crack tip at the steel pipe circumferential weld joint, thereby reducing and eliminating cracks at the steel pipe circumferential weld joint.
The invention has the characteristics and beneficial effects that:
1. according to the steel pipe circumferential weld inner burr grinding device and the grinding method thereof, the linear moving unit and the lifting unit are arranged, so that the positions of the grinding wheel and the holding unit can be adjusted, and the grinding device can better finish grinding of the inner burr of the steel pipe circumferential weld.
2. According to the steel pipe circumferential weld inner burr grinding device and the grinding method thereof, the high-pressure air injection disc, the grinding wheel and the mounting and holding unit are all assembled at the front end of the rotating shaft, and the high-pressure air injection disc, the grinding wheel and the mounting and holding unit with different sizes are replaced, so that the steel pipe circumferential weld inner burrs of steel pipes with different pipe diameters can be ground, and the high-pressure air injection disc, the grinding wheel and the mounting and holding unit have high applicability.
3. According to the steel pipe circumferential weld inner burr grinding device and the grinding method thereof, the pulse current is adopted to assist in grinding the inner burrs at the steel pipe circumferential weld, the plasticity resistance of the inner burrs at the steel pipe circumferential weld can be reduced through the pulse current, the inner burrs at the steel pipe circumferential weld are further convenient to grind, the service life of a grinding wheel is prolonged, and the cost is reduced.
4. According to the device and the method for grinding the burrs in the steel pipe circumferential weld provided by the invention, before grinding is finished, a stronger pulse current is adopted, so that the burr tips at the steel pipe circumferential weld, which are left due to a grinding device and errors, are melted under the action of high temperature, and the molten metal fills some tiny cracks in the steel pipe circumferential weld, so that the cracks at the steel pipe circumferential weld can be eliminated and reduced, and the welding quality and stress at the steel pipe circumferential weld are improved.
Drawings
FIG. 1 is a schematic view of the overall structure of the internal burr grinding device for the steel pipe circumferential weld of the present invention;
FIG. 2 is a schematic view of the installation of the linear motion unit of the present invention on the vehicle body;
FIG. 3 is a schematic view of the installation of the rotary driving unit, the lifting unit and the linear sliding table of the present invention;
FIG. 4 is a front view of the rotary drive unit, the lifting unit, and the linear slide table of the present invention;
FIG. 5 is a schematic view of a rotary shaft according to the present invention;
FIG. 6 is a schematic structural diagram of a holding unit according to the present invention;
FIG. 7 is a schematic view of embodiment 1 of the present invention;
fig. 8 is a flow chart of the grinding method of the present invention.
The main reference numbers:
a frame unit 1; a vehicle body 11; a manual push handle 111; a universal wheel 12; a numerical control table 13; a pulse power supply 14; a temperature feedback system 15; a linear moving unit 2; a lead screw 21; a first support base 22; a linear motor 23; a guide rail 24; a slider 25; a connecting plate 26; a nut 27; a linear sliding table 3; a lift control switch 31; a lifting unit 4; a hydraulic cylinder 41; a lifting platform 42; a bearing block 43; a rotation drive unit 5; a rotating shaft 51; a bearing seat 52; a driven gear 53; a rotating electric machine 54; a second support seat 55; a drive gear 56; a high-pressure air pump 6; a high-pressure breather pipe 61; a high-pressure air injection disc 7; a high-pressure shower head 71; a grinding wheel 8; a mounting unit 9; a holding disc 91; a detection connector 92; a pulse electrode 921; a binocular camera 922; an infrared temperature measuring head 923; the wiring harness 10 is connected.
Detailed Description
The technical contents, structural features, attained objects and effects of the present invention are explained in detail below with reference to the accompanying drawings.
The invention provides a steel pipe circumferential weld inner burr grinding device, as shown in figure 1, which comprises a frame unit 1, a linear moving unit 2, a linear sliding table 3, a lifting unit 4, a rotary driving unit 5, a high-pressure air pump 6, a high-pressure air jet disc 7, a grinding wheel 8 and a holding unit 9, wherein the frame unit 1 comprises a vehicle body 11, a universal wheel 12, a numerical control table 13, a pulse power supply 14 and a temperature feedback system 15, the universal wheel 12 is arranged at the bottom of the vehicle body 11, a manual pushing hand 111 is arranged at the first end of the vehicle body 11, the numerical control table 13, the pulse power supply 14 and the temperature feedback system 15 are all arranged on the vehicle body 11, the numerical control table 13 and the pulse power supply 14 and the numerical control table 13 and the temperature feedback system 15 are all connected and communicated through a connecting wire harness 10, the temperature feedback system 15 mainly transmits real-time temperature detected by an infrared temperature measuring head 923 to the numerical control table 13 for adjusting the pressure of the pulse power supply and controlling the high-pressure of the high-pressure air pump 6, and the pulse electrode 921, the steel pipe inner burr and the pulse power supply form a closed loop.
As shown in fig. 2, the linear moving unit 2 is disposed at the middle portion of the vehicle body 11, and the linear moving unit 2 includes a lead screw 21, a first supporting seat 22, a linear motor 23, a guide rail 24, a slider 25, a connecting plate 26 and a nut 27, a first end of the lead screw 21 is supported on the first supporting seat 22 through a bearing, and a second end of the lead screw 21 is connected to an output shaft of the linear motor 23 through a coupling, the guide rail 24 is disposed on the vehicle body 11, the slider 25 is disposed on a first end surface of the linear sliding table 3, the connecting plate 26 is disposed at the middle of the bottom of the linear sliding table 3, the nut 27 is disposed on the connecting plate 26, the slider 25 is slidably connected to the guide rail 24, and the nut 27 is drivingly connected to the lead screw 21.
Preferably, one side of the linear sliding table 3 is provided with an elevation control switch 31, and the elevation control switch 31 includes a pressurization button, a depressurization button, and a pressure maintaining button.
As shown in fig. 3, a lifting unit 4 is arranged on the linear sliding table 3, the lifting unit 4 includes a hydraulic oil cylinder 41 and a lifting platform 42, the hydraulic oil cylinder 41 is uniformly distributed at the corner of the linear sliding table 3, the first end of the hydraulic oil cylinder 41 is fixedly connected with the linear sliding table 3, and the second end of the hydraulic oil cylinder 41 is fixedly connected with the lifting platform 42.
As shown in fig. 4 and 5, the elevating platform 42 is provided with a rotation driving unit 5, the rotation driving unit 5 includes a rotation shaft 51, a bearing seat 52, a driven gear 53, a rotation motor 54, a second support seat 55 and a driving gear 56, the rotation shaft 51 is a hollow shaft, the rotation shaft 51 is supported at the middle part of the elevating platform 42 through the bearing seat 52, the driven gear 53 is provided at the first end of the rotation shaft 51, the rotation motor 54 is fixed on the elevating platform 42 through the second support seat 55, the output shaft of the rotation motor 54 is connected with the driving gear 56 through a coupling, and the driving gear 56 is in mesh transmission with the driven gear 53.
Preferably, the lifting platform 42 is provided with a bearing block 43 at a middle position.
As shown in fig. 6, the high pressure air pump 6, the high pressure air disk 7, the grinding wheel 8 and the mounting and holding unit 9 are all disposed on the rotating shaft 51, the high pressure air pump 6 is close to the lifting platform 42, the high pressure air disk 7, the grinding wheel 8 and the mounting and holding unit 9 are all disposed at the second end of the rotating shaft 51, the high pressure air pump 6 is communicated with the high pressure air disk 7 through a high pressure vent pipe 61 surrounding the rotating shaft 51, the high pressure nozzles 71 are uniformly distributed on the outer arc surface of the high pressure air disk 7, the high pressure air disk 7 is disposed at the right side of the grinding wheel 8, the mounting and holding unit 9 is disposed at the left side of the grinding wheel 8, the mounting and holding unit 9 is coaxially matched with the rotating shaft 51, the mounting and holding unit 9 axially fixes the grinding wheel 8, the mounting and holding unit 9 includes a mounting and holding disc 91 and a detection connector 92, the mounting and holding disc 91 is connected with the numerical control station 13 through a connection harness 10, and the detection connector 92 is uniformly distributed on the outer arc surface of the mounting and holding disc 91, the first end face of the detection connector 92 is provided with a pulse electrode 921, and the first side face and the second side face of the detection connector 92 are respectively provided with a binocular camera 922 and an infrared temperature measuring head 923.
Preferably, the axial distance between the high-pressure air injection disc 7 and the grinding wheel 8 is 4-6 mm, so that the high-efficiency cooling performance can be guaranteed, the high-pressure air injection disc 7 and the grinding wheel 8 can not be in direct contact, and the high-pressure air injection device 7 is prevented from being damaged due to high temperature generated during grinding of the grinding wheel 8.
Preferably, the first end face of the grinding wheel 8 coincides with the first end face of the holding disc 91, i.e. the holding unit 9 is mounted in close contact with the grinding wheel 8, limiting the axial movement of the grinding wheel 8. The rotary shaft 51 is a hollow shaft, the connecting harness 10 is inserted into the second end of the rotary shaft 51, and contacts with the holding disc 91 of the holding unit 9 through the round hole at the foremost end of the rotary shaft 51, and in order to prevent the connecting harness from winding when the rotary shaft 51 and the holding unit 9 rotate, the connecting harness contacts with the inner wall of the hole of the holding unit 9 only and is not fixed.
In another aspect of the present invention, a grinding method for a steel pipe circumferential weld inner burr grinding device is provided, which includes the following steps:
s1, moving the frame unit 1 to a steel pipe grinding station;
s2, controlling the hydraulic oil cylinder 41 to lift, so that the central axis of the rotating shaft 51 is overlapped with the central axis of the steel pipe 112;
s3, starting the linear motor 23 to drive the linear sliding table 3 to move forwards, so that the mounting and holding unit 9 is aligned with the end face of the circumferential weld of the steel pipe 112;
s4, starting the rotating motor 54, feeding back the real-time form of the circumferential weld of the steel pipe 112 to the numerical control table 13 through the binocular camera 922, judging whether the end face width of the inner burr of the circumferential weld of the steel pipe 112 is larger than 2mm, executing the step S5 when the end face width of the inner burr of the circumferential weld of the steel pipe 112 is larger than 2mm, and executing the step S6 when the end face width of the inner burr of the circumferential weld of the steel pipe 112 is smaller than 2 mm;
s5, switching on a power supply of the pulse electrode 921, and applying pulse current to the circumferential weld of the steel pipe 112;
s6, starting the linear motor 23 to drive the linear sliding table 3 to move forwards continuously, so that the grinding surface of the grinding wheel 8 is aligned with the end surface of the circumferential weld of the steel pipe 112;
s7, starting the rotating motor 54, and grinding the circumferential weld of the steel pipe 112;
s8, feeding the temperature of the circumferential weld of the steel pipe 112 back to the numerical control table 13 in real time through the infrared temperature measuring head 923, judging whether the temperature of the circumferential weld of the steel pipe 112 is higher than 600 ℃, starting the high-pressure air pump 6 when the temperature of the circumferential weld of the steel pipe 112 is higher than 600 ℃, introducing high-pressure air with the pressure of 40MPa into the high-pressure air injection disc 7, starting the high-pressure air pump 6 when the temperature of the circumferential weld of the steel pipe 112 is lower than 600 ℃, and introducing high-pressure air with the pressure of 30MPa into the high-pressure air injection disc 7;
s9, judging whether the height of the inner burrs at the circumferential weld of the steel pipe 112 is greater than 0.4mm or not, executing the step S7 when the height of the inner burrs at the circumferential weld of the steel pipe 112 is greater than 0.4mm, and executing the step S10 when the height of the inner burrs at the circumferential weld of the steel pipe 112 is less than 0.4 mm;
s10, stopping introducing the high-pressure gas into the high-pressure gas injection disc 7;
s11, starting the linear motor 23 to drive the linear sliding table 3 to move backwards, so that the mounting and holding unit 9 is aligned with the end face of the circumferential weld of the steel pipe 112;
and S12, switching on a power supply of the pulse electrode 921, and applying pulse current to the circumferential weld joint of the steel pipe 112, so that the crack tip of the circumferential weld joint of the steel pipe 112 is heated and melted, and cracks at the circumferential weld joint of the steel pipe 112 are reduced and eliminated.
The method comprises the following specific operation steps:
as shown in fig. 7 and 8, the device for grinding inner burrs of a steel pipe circumferential weld and the grinding method thereof of the invention specifically comprise the following steps during operation:
s1, moving the frame unit 1 to a steel pipe grinding station;
s2, controlling the hydraulic oil cylinder 41 to rise, enabling the central axis of the rotating shaft 51 to coincide with the central axis of the steel pipe 112, and pressing a pressure maintaining button in the lifting control switch 31 on one side of the linear sliding table 3 when the rotating shaft 51, the high-pressure air injection disc 7, the grinding wheel 8 and the like rise to a specified height to keep the hydraulic oil cylinder 41 stable and safe;
s3, starting the linear motor 23, driving the linear sliding table 3 to move forwards on the guide rail 24 through the transmission of a screw rod nut, and aligning the installing and holding unit 9 with the end face of the circumferential weld of the steel pipe 112;
s4, starting a rotating motor 54, driving a rotating shaft 51 to rotate through the meshing transmission of a driving gear 56 and a driven gear 53, controlling the rotating shaft 51 and the holding unit 9 to rotate at a low speed through a numerical control console 13, feeding back the real-time form of the circumferential weld of the steel pipe 112 to the numerical control console 13 through a binocular camera 922, judging whether the end face width of the inner burr of the circumferential weld of the steel pipe 112 is larger than 2mm, executing a step S5 when the end face width of the inner burr of the circumferential weld of the steel pipe 112 is larger than 2mm, and executing a step S6 when the end face width of the inner burr of the circumferential weld of the steel pipe 112 is smaller than 2 mm;
s5, switching on a power supply of the pulse electrode 921, and applying pulse current to the circumferential weld of the steel pipe 112, so as to reduce the plasticity of burrs in the circumferential weld of the steel pipe 112 and facilitate grinding of a grinding wheel, wherein parameters of the pulse current are shown in Table 1.
TABLE 1 reduction of pulse current parameters for resistance to shaping at the circumferential weld of a steel pipe
S6, starting the linear motor 23 to drive the linear sliding table 3 to move forwards continuously, so that the grinding surface of the grinding wheel 8 is aligned with the end surface of the circumferential weld of the steel pipe 112, and no pulse current is applied to the circumferential weld of the steel pipe 112 at the moment, so that the linear sliding table is mainly used for preventing the inner burrs from generating point discharge and damaging the inner wall of the steel pipe 112;
s7, starting the rotating motor 54, driving the grinding wheel 8 to rotate through the rotating shaft 51, and grinding the circumferential weld of the steel pipe 112;
s8, feeding the temperature of the circumferential weld of the steel pipe 112 back to the numerical control table 13 in real time through the infrared temperature measuring head 923, judging whether the temperature of the circumferential weld of the steel pipe 112 is higher than 600 ℃, starting the high-pressure air pump 6 when the temperature of the circumferential weld of the steel pipe 112 is higher than 600 ℃, introducing high-pressure air with the pressure of 40MPa into the high-pressure air injection disc 7, starting the high-pressure air pump 6 when the temperature of the circumferential weld of the steel pipe 112 is lower than 600 ℃, and introducing high-pressure air with the pressure of 30MPa into the high-pressure air injection disc 7;
s9, judging whether the height of the inner burrs at the circumferential weld of the steel pipe 112 is greater than 0.4mm or not, executing the step S7 when the height of the inner burrs at the circumferential weld of the steel pipe 112 is greater than 0.4mm, and executing the step S10 when the height of the inner burrs at the circumferential weld of the steel pipe 112 is less than 0.4 mm;
s10, stopping introducing the high-pressure gas into the high-pressure gas injection disc 7;
s11, starting the linear motor 23, driving the linear sliding table 3 to move backwards on the guide rail 24 through the transmission of a screw rod nut, and aligning the installing and holding unit 9 with the end face of the circumferential weld of the steel pipe 112;
and S12, switching on a power supply of the pulse electrode 921, and applying pulse current to the circumferential weld joint of the steel pipe 112 to heat and melt the crack tip of the circumferential weld joint of the steel pipe 112, so as to reduce and eliminate cracks at the circumferential weld joint of the steel pipe 112, wherein parameters of the pulse current are shown in Table 2.
TABLE 2 pulse Current parameters for reducing and eliminating cracks at circumferential weld of steel pipes
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope defined by the claims of the present invention.
Claims (6)
1. A steel pipe circumferential weld inner burr grinding device is characterized by comprising a frame unit, a linear moving unit, a linear sliding table, a lifting unit, a rotary driving unit, a high-pressure air pump, a high-pressure air jet disc, a grinding wheel and a holding unit,
the frame unit comprises a vehicle body, universal wheels, a numerical control platform, a pulse power supply and a temperature feedback system, wherein the universal wheels are arranged at the bottom of the vehicle body, a manual pushing handle is arranged at the first end of the vehicle body, the numerical control platform, the pulse power supply and the temperature feedback system are all arranged on the vehicle body, and the numerical control platform and the pulse power supply and the numerical control platform and the temperature feedback system are all connected and communicated through connecting wire harnesses;
the linear moving unit is arranged in the middle of the vehicle body, the lifting unit is arranged on the linear sliding table and comprises hydraulic oil cylinders and a lifting platform, the hydraulic oil cylinders are uniformly distributed at the corners of the linear sliding table, the first ends of the hydraulic oil cylinders are fixedly connected with the linear sliding table, and the second ends of the hydraulic oil cylinders are fixedly connected with the lifting platform;
the lifting platform is provided with the rotary driving unit, the rotary driving unit comprises a rotary shaft, a bearing seat, a driven gear, a rotary motor, a second supporting seat and a driving gear, the rotary shaft is a hollow shaft, the rotary shaft is supported in the middle of the lifting platform through the bearing seat, the driven gear is arranged at the first end of the rotary shaft, the rotary motor is fixedly arranged on the lifting platform through the second supporting seat, an output shaft of the rotary motor is connected with the driving gear through a coupler, and the driving gear is in meshing transmission with the driven gear;
the high-pressure air pump, the high-pressure air jet disc, the grinding wheel and the holding unit are all arranged on the rotating shaft, the high-pressure air pump is close to the lifting platform, the high-pressure air injection disc, the grinding wheel and the mounting and holding unit are all positioned at the second end of the rotating shaft, the high-pressure air pump is communicated with the high-pressure air jet disc through a high-pressure vent pipe arranged on the outer side of the rotating shaft in a surrounding way, and the outer cambered surface of the high-pressure air injection disc is uniformly provided with high-pressure nozzles, the high-pressure air injection disc is positioned on the right side of the grinding wheel, the left side of the grinding wheel is provided with the holding unit, the holding unit comprises a holding disc and a detection connector, the holding disc is connected with the numerical control table through a connecting wire harness, the detection connectors are uniformly distributed on the cambered surface on the outer side of the holding disc, the first end surface of each detection connector is provided with a pulse electrode, the first side face and the second side face of the detection connector are respectively provided with a binocular camera and an infrared temperature measuring head;
the first end surface of the grinding wheel is overlapped with the first end surface of the holding disc, namely the holding unit is tightly contacted and installed with the grinding wheel, and the axial movement of the grinding wheel is limited; the rotating shaft is a hollow shaft, a connecting wire harness penetrates through the hollow shaft, the connecting wire harness is led to the second end of the rotating shaft and is in contact with a holding disc of the holding unit through a round hole in the foremost end of the rotating shaft, and in order to prevent the connecting wire harness from being wound when the rotating shaft and the holding unit rotate, the connecting wire harness is only in contact with the inner wall of the hole of the holding unit and is not fixedly connected with the inner wall of the hole of the holding unit.
2. The steel pipe circumferential weld inner burr grinding device of claim 1, characterized in that, the rectilinear movement unit includes lead screw, first supporting seat, linear electric motor, guide rail, slider, connecting plate and screw, the first end of lead screw pass through the bearing support in on the first supporting seat, just the second end of lead screw pass through the shaft coupling with linear electric motor's output shaft, the guide rail is located respectively on the automobile body, the slider is located the first terminal surface of straight line slip table, just department is equipped with in the middle of the straight line slip table bottom the connecting plate, the screw is located on the connecting plate, just the slider with guide rail sliding connection, the screw with screw transmission connects.
3. The device for grinding the inner burrs of the circumferential weld of the steel pipe according to claim 1, wherein a bearing block is arranged in the middle of the lifting platform.
4. The device for grinding the burrs in the circumferential weld of the steel pipe according to claim 1, wherein the axial distance between the high-pressure air injection disc and the grinding wheel ranges from 4mm to 6 mm.
5. The device for grinding the burrs in the circumferential weld of the steel pipe according to claim 1, wherein a lifting control switch is arranged on one side of the linear sliding table and comprises a pressurizing button, a pressure reducing button and a pressure maintaining button.
6. A grinding method for realizing the steel pipe girth weld inner burr grinding device according to any one of claims 1 to 5, characterized by comprising the steps of:
s1, moving the frame unit to a steel pipe grinding station;
s2, controlling the hydraulic oil cylinder to lift, so that the central axis of the rotating shaft coincides with the central axis of the steel pipe;
s3, starting the linear motor to drive the linear sliding table to move forwards, so that the mounting and holding unit is aligned with the end face of the circumferential weld of the steel pipe;
s4, starting the rotating motor, feeding back the real-time form of the steel pipe circumferential weld to the numerical control console through the binocular camera, judging whether the end face width of the inner burr of the steel pipe circumferential weld is larger than 2mm, executing the step S5 when the end face width of the inner burr of the steel pipe circumferential weld is larger than 2mm, and executing the step S6 when the end face width of the inner burr of the steel pipe circumferential weld is smaller than 2 mm;
s5, switching on the pulse electrode power supply, and applying pulse current to the circumferential weld of the steel pipe;
s6, starting the linear motor to drive the linear sliding table to move forwards continuously, so that the grinding surface of the grinding wheel is aligned with the end surface of the steel pipe circumferential weld;
s7, starting the rotating motor, and grinding the circumferential weld of the steel pipe;
s8, feeding back the temperature of the steel pipe circumferential weld to the numerical control table in real time through the infrared temperature measuring head, judging whether the temperature of the steel pipe circumferential weld is higher than 600 ℃, starting the high-pressure air pump when the temperature of the steel pipe circumferential weld is higher than 600 ℃, and introducing high-pressure air with the pressure of 40MPa into the high-pressure air injection disc, and starting the high-pressure air pump when the temperature of the steel pipe circumferential weld is lower than 600 ℃ and introducing high-pressure air with the pressure of 30MPa into the high-pressure air injection disc;
s9, judging whether the height of the inner burrs at the steel pipe circumferential weld is larger than 0.4mm or not, executing the step S7 when the height of the inner burrs at the steel pipe circumferential weld is larger than 0.4mm, and executing the step S10 when the height of the inner burrs at the steel pipe circumferential weld is smaller than 0.4 mm;
s10, stopping introducing high-pressure gas into the high-pressure gas injection disc;
s11, starting the linear motor to drive the linear sliding table to move backwards, so that the mounting and holding unit is aligned with the end face of the circumferential weld of the steel pipe;
and S12, switching on the pulse electrode power supply, and applying pulse current to the steel pipe circumferential weld joint to heat and melt the crack tip at the steel pipe circumferential weld joint, thereby reducing and eliminating cracks at the steel pipe circumferential weld joint.
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Effective date of registration: 20221205 Address after: No. 58, Jintan Avenue, Jintan District, Changzhou City, Jiangsu Province, 213200 Patentee after: Sokosais (Jiangsu) Machinery Technology Co.,Ltd. Address before: 066004 No. 438 west section of Hebei Avenue, seaport District, Hebei, Qinhuangdao Patentee before: Yanshan University |