CN114473648B - Magnetic grinding device based on dynamic magnetic field assistance - Google Patents
Magnetic grinding device based on dynamic magnetic field assistance Download PDFInfo
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- CN114473648B CN114473648B CN202210219999.3A CN202210219999A CN114473648B CN 114473648 B CN114473648 B CN 114473648B CN 202210219999 A CN202210219999 A CN 202210219999A CN 114473648 B CN114473648 B CN 114473648B
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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
- B24B1/005—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes using a magnetic polishing agent
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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
- B24B37/00—Lapping machines or devices; Accessories
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Mechanical Engineering (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
The invention discloses a magnetic grinding device based on dynamic magnetic field assistance, which comprises a workpiece transmission mechanism, a magnetic field assistance mechanism and a magnetic abrasive, wherein the workpiece transmission mechanism is used for installing a pipe fitting to be polished and driving the pipe fitting to be polished to rotate; the magnetic field auxiliary mechanism comprises a static magnet, a dynamic magnet and a magnet moving assembly, wherein the static magnet is arranged on one side of the pipe fitting to be polished, the dynamic magnet is arranged on the magnet moving assembly, and the dynamic magnet is positioned on the other side of the pipe fitting to be polished and is driven by the magnet moving assembly to be close to and far away from the static magnet so as to change the distribution of magnetic force lines between the static magnet and the dynamic magnet; the magnetic abrasive is used for filling the to-be-polished position in the to-be-polished pipe fitting, is arranged along the magnetic force lines and can turn over along with the change of the magnetic force lines. The invention has novel and reasonable structure, and utilizes the dynamic change of the magnetic field to update the rolling of the abrasive particles arranged on the magnetic force line at the position to be polished, thereby increasing the utilization rate and improving the polishing efficiency.
Description
Technical Field
The invention relates to the technical field of part polishing, in particular to a magnetic grinding device based on dynamic magnetic field assistance.
Background
At present, polishing technologies of the inner surfaces of pipe fittings mainly comprise an electrochemical polishing technology, a magnetic grinding and polishing technology, an electrolysis-magnetic force composite grinding and polishing technology, a rotary magnetic pole auxiliary magnetic grinding and polishing technology, an ultrasonic auxiliary magnetic grinding and polishing technology and an alternating magnetic field auxiliary magnetic grinding and polishing technology.
However, in the existing polishing technology for pipe parts:
the electrochemical polishing technology has the advantages that the electrolyte is complex in configuration and high in cost during processing, the application range of the technology is limited, the technology can only be used for polishing conductive materials, the polishing effect is difficult to ensure, and the problems of environmental pollution and the like exist.
And (II) the magnetic grinding and polishing technology is characterized in that the magnet is static relative to the movement of the workpiece in the processing, the magnetic field is relatively static, abrasive particles are fixed along the arrangement position of magnetic lines, the abrasive particles participating in cutting are not updated, the polishing efficiency is low, and the cost is high.
(III) although the electrolytic-magnetic polishing technique is high in polishing efficiency, problems in electrochemical polishing and magnetic polishing still remain.
And (IV) compared with the magnetic grinding and polishing technology, the rotary magnetic pole auxiliary magnetic grinding and polishing technology improves the polishing efficiency, but because the auxiliary magnetic pole part is difficult to fix, the structure is complex, the processing range is limited, meanwhile, the auxiliary magnetic pole can form a magnetic loop with an external magnetic pole, the magnetic field intensity in a unit space is increased, and the magnetic abrasive particles acquire additional pressure under the adsorption action of the auxiliary magnetic pole. As the grinding pressure is increased, the acting force among the magnetic grinding particles is increased, the rigidity of the magnetic grinding particle groups is enhanced, the rolling auxiliary effect of the magnetic grinding particles cannot be normally exerted, the phenomenon of superposition of grinding tracks is easy to occur, and the surface quality of a workpiece is not improved.
And (V) during the processing of the ultrasonic magnetic grinding and polishing technology, the defect wave is easy to appear on the workpiece during polishing due to the addition of ultrasonic vibration.
In view of the foregoing, it is necessary to provide a new polishing technique to overcome the problems of low abrasive particle utilization and low polishing efficiency caused by the fixed abrasive particle positions in the conventional polishing technique for pipe parts.
Disclosure of Invention
The invention aims to provide a magnetic grinding device based on dynamic magnetic field assistance, which can enable abrasive particles arranged on a magnetic line to roll and update through dynamic change of a magnetic field, so that the utilization rate of the abrasive particles is increased, and the polishing efficiency is improved, and the problems of low utilization rate of the abrasive particles and low polishing efficiency caused by fixed abrasive particle positions in the conventional pipe fitting part polishing technology are solved.
In order to achieve the above object, the present invention provides the following solutions:
the invention provides a magnetic grinding device based on dynamic magnetic field assistance, which comprises:
the workpiece transmission mechanism is used for installing a pipe fitting to be polished and driving the pipe fitting to be polished to rotate;
the magnetic field auxiliary mechanism comprises a static magnet, a dynamic magnet and a magnet moving assembly; the static magnet is arranged on one side of the pipe fitting to be polished through a static magnet clamp, the dynamic magnet is arranged on the magnet moving assembly, and the dynamic magnet is positioned on the other side of the pipe fitting to be polished and is driven by the magnet moving assembly to be close to and far away from the static magnet, so that the distribution of magnetic force lines between the static magnet and the dynamic magnet is changed;
the magnetic abrasive is used for being filled at a position to be polished in the pipe fitting to be polished, and comprises ferromagnetic particles and abrasive particles, wherein the abrasive particles are arranged at the position to be polished along the magnetic force lines and can turn over along with the change of the magnetic force lines.
Optionally, the stationary magnet includes a first permanent magnet, and the dynamic magnet is a dynamic permanent magnet; the N pole of the first permanent magnet is arranged opposite to the S pole of the dynamic permanent magnet; or the S pole of the first permanent magnet is arranged opposite to the N pole of the dynamic permanent magnet.
Optionally, the stationary magnet includes a second permanent magnet and a third permanent magnet, and the dynamic magnet is a dynamic permanent magnet; the second permanent magnet, the third permanent magnet and the dynamic permanent magnet are distributed on the periphery of the pipe fitting to be polished at intervals, wherein one of the second permanent magnet and the third permanent magnet and the dynamic permanent magnet is arranged with the S pole facing the pipe fitting to be polished, and the other of the second permanent magnet and the third permanent magnet is arranged with the N pole facing the pipe fitting to be polished;
or one of the second permanent magnet and the third permanent magnet and the dynamic permanent magnet are arranged with the N pole facing the pipe fitting to be polished, and the other one of the second permanent magnet and the third permanent magnet is arranged with the S pole facing the pipe fitting to be polished.
Optionally, when the dynamic permanent magnet is located at a position closest to the pipe fitting to be polished, the second permanent magnet, the third permanent magnet and the dynamic permanent magnet are uniformly distributed on the periphery of the pipe fitting to be polished in circumference.
Optionally, the workpiece transmission mechanism includes:
the device comprises a first base, a second motor and a spindle seat, wherein the first base is provided with the first motor and the spindle seat, and a spindle is rotatably arranged on the spindle seat;
the transmission assembly comprises a driving wheel, a driven wheel and a transmission belt, wherein the driving wheel is connected with the first motor, the driven wheel is connected with one end of the main shaft, and the driving wheel is connected with the driven wheel through the transmission belt;
the three-jaw chuck is arranged at the other end of the main shaft and used for clamping one end of the pipe fitting to be polished.
Optionally, the workpiece transmission mechanism further includes a centering frame, and the centering frame includes:
the second base is vertically provided with an upright post;
the first cantilever beam is perpendicular to the pipe fitting to be polished, one end of the first cantilever beam is mounted on the upright post, and the position of the first cantilever beam along the height direction of the upright post is adjustable;
the second cantilever beam is perpendicular to the pipe fitting to be polished and is positioned below the first cantilever beam; one end of the second cantilever beam is arranged on the upright post, and the position of the second cantilever beam along the height direction of the upright post is adjustable;
the guide assembly comprises three groups of pulleys, one group of pulleys are rotatably arranged at the other end of the first cantilever beam, two groups of pulleys are rotatably arranged at the other end of the second cantilever beam along the length extending direction of the second cantilever beam, the rotation axis of any pulley is parallel to the axis of the pipe fitting to be polished, and the pulleys on the first cantilever beam are positioned between the two groups of pulleys on the second cantilever beam; the other end of the pipe fitting to be polished is inserted between the first cantilever beam and the second cantilever beam and is in rolling contact with any pulley.
Optionally, the magnet moving assembly includes:
the wire rail is perpendicular to the pipe fitting to be polished;
the lead screw sliding block assembly comprises a lead screw and a linear rail displacement table in threaded connection with the lead screw, the lead screw is parallel to the linear rail and is rotatably arranged on the linear rail, and the linear rail displacement table is in sliding fit with the linear rail; one end of the screw rod, which is far away from the pipe fitting to be polished, is connected with a second motor;
and the dynamic magnet clamp is arranged on the linear rail displacement table and is used for installing the dynamic magnet.
Optionally, the magnetic abrasive is a magnetic fluid, and the magnetic fluid is a mixture of grinding fluid, ferromagnetic particles and abrasive particles.
Optionally, plant cellulose is also added into the magnetic fluid.
Optionally, the motor control device further comprises a control mechanism, wherein the control mechanism is electrically connected with the first motor and the second motor.
Optionally, the device further comprises a bottom plate, wherein the bottom plate is provided with the standing magnet clamp, the first base and the wire rail.
The invention also provides another magnetic grinding device based on dynamic magnetic field assistance, which comprises:
the workpiece transmission mechanism is used for installing a pipe fitting to be polished and driving the pipe fitting to be polished to rotate;
the magnetic field auxiliary mechanism comprises three electromagnets, and the three electromagnets are distributed on the periphery of the pipe fitting to be polished; any electromagnet is provided with independent current coils, and at least one current coil can be switched back and forth between a power-on state and a power-off state so as to change the distribution of magnetic force lines among the three electromagnets;
the magnetic abrasive is used for being filled at a position to be polished in the pipe fitting to be polished, and comprises ferromagnetic particles and abrasive particles, wherein the abrasive particles are arranged at the position to be polished along the magnetic force lines and can turn over along with the change of the magnetic force lines.
Compared with the prior art, the invention has the following technical effects:
the magnetic grinding device based on the dynamic magnetic field assistance is novel and reasonable in structure, the magnet moving assembly drives the dynamic magnet to intermittently keep away from the static magnet, so that the distribution of magnetic lines between the static magnet and the dynamic magnet is changed, the ferromagnetic particles arranged on the magnetic lines (or called as magnetic induction lines) at the position to be polished are changed in position by utilizing the dynamic change of the magnetic field, so that abrasive particles attached to the surfaces of the ferromagnetic particles are rolled and updated, different abrasive particles are contacted and cut at different angles at the position to be polished in a pipe fitting to be polished, the problem that the abrasive particles are overused to generate passivation, the utilization rate of the abrasive particles is increased, and the polishing efficiency is improved is solved, so that the problems of low abrasive particle utilization rate and low polishing efficiency caused by the fixed abrasive particle position in the conventional pipe fitting part polishing technology are effectively solved.
The magnetic grinding device based on the dynamic magnetic field assistance is of a brand new design, and compared with the magnetic grinding polishing and rotary magnetic pole assistance polishing technology, the magnetic grinding device has the advantages that the polishing efficiency and the surface quality are improved; compared with the ultrasonic-assisted magnetic grinding technology and the alternating magnetic field-assisted grinding technology, the method improves the participation rate of abrasive particles in the polishing process and reduces the processing cost.
In some technical schemes, the magnetic grinding device based on the dynamic magnetic field assistance provided by the invention adopts magnetic fluid as a magnetic abrasive, the magnetic fluid is magnetic composite fluid formed by mixing grinding fluid, ferromagnetic particles and abrasive particles, the magnetic fluid can effectively roll under the action of the dynamic magnetic field, high-efficiency polishing is realized, the magnetic grinding device is an environment-friendly material, the cost is low, the consumption is low, the only consumable is the grinding fluid, and the grinding fluid contains 97% of water, so that the magnetic grinding device has no toxicity and fire hazard, and completely meets the environment-friendly emission standard.
In another magnetic grinding device based on dynamic magnetic field assistance, the permanent magnets are replaced by the electromagnets, at least one of the electromagnets is powered off according to a certain frequency, the magnetic field can be correspondingly changed according to the power-off frequency, and the effect of turning abrasive particles can be achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a top view of a magnetic grinding device based on dynamic magnetic field assistance according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of A-A of the dynamic magnetic field assisted magnetic abrasion device disclosed in FIG. 1;
FIG. 3 is a schematic structural view of a centering frame disclosed in an embodiment of the present invention;
fig. 4 is a schematic diagram of wiring of a first motor and a second motor and a control system according to an embodiment of the present invention.
Wherein, the reference numerals are as follows: 100. magnetic grinding device based on dynamic magnetic field assistance;
1. a magnetic abrasive; 2. pipe fittings to be polished; 31. a second permanent magnet; 32. a third permanent magnet; 4. a dynamic magnet; 5. standing the magnet clamp; 6. a dynamic magnet clamp; 7. a first base; 8. a first motor; 81. a motor bracket; 9. a spindle base; 10. a main shaft; 11. a driving wheel; 12. driven wheel; 13. a transmission belt; 14. a three-jaw chuck; 15. a centering frame; 151. a second base; 152. a column; 153. a first cantilever beam; 154. a second cantilever beam; 155. a pulley I; 156. a second pulley; 157. a third pulley; 16. a wire rail; 17. a screw rod; 18. a linear rail displacement table; 19. a second motor; 20. a bottom plate; 21. a coupling.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a magnetic grinding device based on dynamic magnetic field assistance, which can change the positions of ferromagnetic particles arranged on a magnetic line through dynamic change of a magnetic field, so that abrasive particles attached to the surfaces of the ferromagnetic particles are rolled and updated, thereby increasing the utilization rate of the abrasive particles and improving the polishing efficiency, and solving the problems of low utilization rate of the abrasive particles and low polishing efficiency caused by fixed positions of the abrasive particles in the conventional pipe fitting part polishing technology.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Example 1
As shown in fig. 1 to 2, the present embodiment provides a magnetic grinding device 100 based on dynamic magnetic field assistance, which mainly includes a workpiece transmission mechanism, a magnetic field assistance mechanism and a magnetic abrasive, wherein the workpiece transmission mechanism is used for installing a pipe fitting 2 to be polished and driving the pipe fitting 2 to be polished to rotate; the magnetic field auxiliary mechanism comprises a static magnet, a dynamic magnet 4 and a magnet moving assembly, wherein the static magnet is arranged on one side of a pipe fitting 2 to be polished through a static magnet clamp 5, the dynamic magnet 4 is arranged on the magnet moving assembly, the dynamic magnet 4 is positioned on the other side of the pipe fitting 2 to be polished, and the dynamic magnet 4 is driven by the magnet moving assembly to be close to and far away from the static magnet, so that the distribution of magnetic force lines between the static magnet and the dynamic magnet 4 changes, and the dynamic magnet 4 is driven to be far away from and close to the static magnet repeatedly, so that the distribution of magnetic force lines between the static magnet and the dynamic magnet 4 changes in a certain rule. The magnetic abrasive 1 is used for being filled in a position to be polished in a pipe fitting 2 to be polished, and comprises ferromagnetic particles and abrasive particles, wherein the abrasive particles are attached to the surfaces of the ferromagnetic particles, are arranged at the position to be polished along magnetic lines of force, and can turn over along with the change of the magnetic lines of force.
In this embodiment, the stationary magnet includes only the first permanent magnet, and the dynamic magnet 4 is a dynamic permanent magnet; the N pole of the first permanent magnet is arranged opposite to the S pole of the dynamic permanent magnet; or the S pole of the first permanent magnet is arranged opposite to the N pole of the dynamic permanent magnet. In this case, the first permanent magnets and the dynamic magnets 4 are preferably distributed symmetrically on both sides of the tube 2 to be polished.
In addition, the stationary magnet may further include two permanent magnets, namely a second permanent magnet 31 and a third permanent magnet 32, and the dynamic magnet 4 is a dynamic permanent magnet; the second permanent magnet 31, the third permanent magnet 32 and the dynamic permanent magnet are distributed at intervals on the periphery of the pipe fitting 2 to be polished, wherein one of the second permanent magnet 31 and the third permanent magnet 32 and the dynamic permanent magnet are arranged with the S pole facing the pipe fitting 2 to be polished, and the other of the second permanent magnet 31 and the third permanent magnet 32 is arranged with the N pole facing the pipe fitting 2 to be polished; or one of the second permanent magnet 31 and the third permanent magnet 32 and the dynamic permanent magnet are arranged with the N pole facing the pipe fitting 2 to be polished, and the other one of the second permanent magnet 31 and the third permanent magnet 32 is arranged with the S pole facing the pipe fitting 2 to be polished. Preferably, when the dynamic permanent magnets are located at the position closest to the pipe fitting 2 to be polished, the second permanent magnets 31, the third permanent magnets 32 and the dynamic permanent magnets are uniformly distributed on the periphery of the pipe fitting 2 to be polished circumferentially, and the second permanent magnets 31, the third permanent magnets 32 and the dynamic permanent magnets are arranged at intervals of 120 degrees in the circumferential direction, as shown in fig. 2.
In this embodiment, as shown in fig. 1, the workpiece transmission mechanism includes a first base 7, a transmission assembly and a three-jaw chuck 14, a first motor 8 and a spindle seat 9 are disposed on the first base 7, the first motor 8 is supported and fixed by a motor bracket 81, and a spindle 10 is rotatably mounted on the spindle seat 9 by a bearing; the transmission assembly comprises a driving wheel 11, a driven wheel 12 and a transmission belt 13, wherein the driving wheel 11 is connected with the output end of the first motor 8, the driven wheel 12 is connected with one end of the main shaft 10, and the driving wheel 11 and the driven wheel 12 are connected through the transmission belt 13 to form a transmission belt mechanism; a three-jaw chuck 14 is mounted to the other end of the main shaft 10 for clamping one end of the pipe 2 to be polished. Wherein, the main shaft seat 9 is arranged on the first base 7 through bolts; the driving wheel 11 is connected with the output shaft of the first motor 8 through interference fit, and the driven wheel 12 is connected with the main shaft 10 through interference fit; the three-jaw chuck 14 is mounted on the spindle 10 by a screw connection.
In this embodiment, as shown in fig. 1 and 3, the workpiece transmission mechanism further includes a centering frame 15, where the centering frame 15 includes a second base 151, a first cantilever beam 153, a second cantilever beam 154, and a guiding component, and a vertical column 152 is vertically disposed on the second base 151, and the vertical column 152 is perpendicular to the pipe 2 to be polished; the first cantilever beam 153 is perpendicular to the pipe fitting 2 to be polished, the first cantilever beam 153 is perpendicular to the upright post 152, one end of the first cantilever beam 153 is mounted on the upright post 152, and the position of the first cantilever beam 153 along the height direction of the upright post 152 is adjustable; the second cantilever beam 154 is perpendicular to the pipe fitting 2 to be polished and is positioned below the first cantilever beam 153, and the second cantilever beam 154 is parallel to the first cantilever beam 153; one end of the second cantilever beam 154 is mounted on the upright 152, and the position of the second cantilever beam 154 along the height direction of the upright 152 is adjustable. The guiding assembly comprises three groups of pulleys, namely a pulley one 155, a pulley two 156 and a pulley three 157, wherein one group of pulleys, namely a pulley one 155, are rotatably arranged at the other end (namely a cantilever end) of the first cantilever beam 153, and two groups of pulleys, namely a pulley two 156 and a pulley three 157, are rotatably arranged at the other end (namely a cantilever end) of the second cantilever beam 154 along the length extending direction of the second cantilever beam 154; the rotation axis of any pulley is parallel to the axis of the pipe 2 to be polished, and the pulley one 155 on the first cantilever beam 153 is located between the pulley two 156 and the pulley three 157 on the second cantilever beam 154; the end of the pipe 2 to be polished, which is far away from the three-jaw chuck 14, is used to be inserted between the first cantilever beam 153 and the second cantilever beam 154, and is in rolling contact with the pulley one 155, the pulley two 156 and the pulley three 157. Preferably, the pulley one 155 is located on the vertical line of the centers of the pulley two 156 and the pulley three 157, that is, the midpoint of the central line of the pulley two 156 and the pulley three 157 is in line with the center of the pulley one 155, so as to ensure that the pipe 2 to be polished is firmly clamped between the pulley one 155, the pulley two 156 and the pulley three 157. The number of pulley blocks of the guide assembly is not limited to the three groups; the pulley one 155, the pulley two 156 and the pulley three 157 may be replaced by bearing structures, which can support the pipe 2 to be polished without restricting the rotation of the pipe 2 to be polished.
In this embodiment, the upright 152 may be mounted on the second base 151 by bolts. The upright post 152 is provided with an adjusting through groove along the height extending direction, as shown in fig. 3, the first cantilever beam 153 and the second cantilever beam 154 are preferably fastened in the adjusting through groove by bolts and nuts; the first cantilever beam 153 and/or the second cantilever beam 154 can be adjusted up and down along the upright post 152 by unscrewing the bolts and nuts, and the first cantilever beam 153 and/or the second cantilever beam 154 is fixed on the upright post 152 by screwing the bolts and nuts after being adjusted to a proper position.
In this embodiment, as shown in fig. 1 and 2, the magnet moving assembly includes a wire rail 16, a screw slider assembly and a dynamic magnet fixture 6, wherein the wire rail 16 is perpendicular to the pipe 2 to be polished; the lead screw sliding block assembly comprises a lead screw 17 and a linear rail displacement table 18 in threaded connection with the lead screw 17, the lead screw 17 is parallel to the linear rail 16 and is rotatably arranged on the linear rail 16, and the linear rail displacement table 18 is in sliding fit with the linear rail 16; one end of the screw rod 17, which is far away from the pipe fitting 2 to be polished, can be connected with a second motor 19 through a coupler 21; the dynamic magnet fixture 6 is mounted on a linear rail displacement table 18 for mounting the dynamic magnet 4. The dynamic magnet clamp 6 is preferably connected to a linear rail displacement table 18 through a bolt, and the linear rail displacement table 18 can reciprocate along the screw rod 17 under the rotation of the screw rod 17; the dynamic permanent magnet 3 and the dynamic magnet holder 6 reciprocate with the linear rail displacement stage 18.
In this embodiment, the magnetic abrasive 1 is preferably a magnetic fluid, and the magnetic fluid is a mixture of grinding fluid, ferromagnetic particles, plant cellulose and abrasive particles.
In this embodiment, the motor further comprises a control mechanism, and the control mechanism is electrically connected with the first motor 8 and the second motor 19. As shown in FIG. 4, the control mechanism mainly comprises a direct current power supply, a first controller, a second controller, a first speed regulator and a second speed regulator. The input end of the direct current power supply is connected with 220V household alternating current (grounded), the output port I is connected with the input end of the controller I, and the output port II is connected with the input end of the controller II; the output end of the first controller is connected with the first motor 8, and the control end of the first controller is connected with the first speed regulator; similarly, the output end of the second controller is connected with the second motor 19, and the control end is connected with the second speed regulator. The control mechanism can be used for controlling the start and stop, the rotation rate and the rotation frequency of the first motor 8 and the second motor 19, so that the automatic operation of the magnetic grinding device is realized.
In this embodiment, as shown in fig. 1, the base plate 20 is further comprised of a base plate 20, and the stationary magnet holder 5, the first base 7, the wire rail 16, and the second base 151 are mounted on the base plate 20. Preferably, the stationary magnet fixture 5, the first base 7, the wire rail 16 and the second base 151 are all fixed to the bottom plate 20 by screw connection.
In this embodiment, the adopted stationary magnet fixture 5 and the dynamic magnet fixture are preferably plate structures, and the first permanent magnet, the second permanent magnet 31 and the third permanent magnet 32 are respectively embedded in the stationary magnet fixture 5 and can be fixed on the stationary magnet fixture 5 by interference fit, bolting and other manners. Similarly, the dynamic magnet 4 is embedded in the dynamic magnet clamp and can be fixed on the dynamic magnet clamp by interference fit, bolting and the like.
The working principle of the magnetic grinding device 100 based on the dynamic magnetic field assist of the present embodiment will be specifically described below by taking the arrangement of the second permanent magnet 31, the third permanent magnet 32, and the dynamic magnet 4 as an example. As shown in fig. 2, the second permanent magnet 31, the third permanent magnet 32 and the dynamic magnet 4 are uniformly distributed on the periphery of the pipe fitting 2 to be polished at intervals, one of the second permanent magnet 31 and the third permanent magnet 32 is set with an S pole towards the pipe fitting 2 to be polished, the other is set with an N pole towards the pipe fitting 2 to be polished, and the dynamic magnet 4 is set with an S pole towards the pipe fitting 2 to be polished.
One end of the pipe fitting 2 to be polished passes through the stationary magnet clamp 5 to be fixed on the three-jaw chuck 14, the other end is inserted between the first cantilever beam 153 and the second cantilever beam 154 of the centering frame 15, the first motor 8 is started, the main shaft 10, the three-jaw chuck 14 and the pipe fitting 2 to be polished are driven to synchronously rotate through the transmission belt 13, the dynamic magnet clamp 6 drives the dynamic magnet 4 to do periodic reciprocating linear motion along with the linear rail displacement table 18, namely the dynamic magnet 4 reciprocates for a plurality of times to be far away from and close to the second permanent magnet 31 and the third permanent magnet 32; a certain amount of magnetic fluid (namely, a magnetic abrasive 1) is injected into the pipe fitting 2 to be polished, the magnetic fluid forms a flexible cluster structure under the action of a magnetic field, ferromagnetic particles are distributed along magnetic lines, abrasive particles are attached to the surfaces of the ferromagnetic particles, micro cutting is carried out at the contact position of the pipe wall of the pipe fitting 2 to be polished, along with the reciprocating motion of the dynamic magnet 4, the magnetic field distribution is changed continuously according to a certain periodicity rule, so that the positions of the ferromagnetic particles at the contact position of the inner pipe wall of the pipe fitting 2 to be polished are changed, and the abrasive particles attached to the surfaces of the ferromagnetic particles are updated and rolled continuously, thereby achieving the effect of efficient polishing. According to the technical scheme, a brand new design is provided, the dynamic permanent magnet moves according to a certain frequency, the magnetic field changes regularly, and abrasive particles arranged on the magnetic force line are continuously rolled and updated, so that the utilization rate of the abrasive particles is increased, and the polishing efficiency is improved.
In the embodiment, plant cellulose can be mixed into the magnetic fluid to enhance the viscosity of the magnetic fluid and improve the polishing quality of the magnetic fluid on the pipe in the overturning process.
Therefore, the magnetic grinding device based on the dynamic magnetic field assistance is novel and reasonable in structure, the dynamic magnet is driven by the magnet moving assembly to intermittently keep away from the static magnet, so that the distribution of magnetic lines of force between the static magnet and the dynamic magnet changes, and abrasive particles arranged on the magnetic lines of force (or called as 'magnetic induction lines') at positions to be polished are rolled and updated by utilizing the dynamic change of the magnetic field, so that different abrasive particles are contacted and cut at different angles at the positions to be polished in a pipe fitting to be polished, the transition use of the abrasive particles is avoided, passivation is generated, the utilization rate of the abrasive particles is increased, and the polishing efficiency is improved, so that the problems of low abrasive particle utilization rate and low polishing efficiency caused by the fixed abrasive particle positions in the conventional pipe fitting part polishing technology are effectively solved.
The magnetic grinding device based on the dynamic magnetic field assistance is of a brand new design, and compared with the magnetic grinding polishing and rotating magnetic pole assistance polishing technology, the magnetic grinding device has the advantages that the polishing efficiency and the surface quality are improved; compared with the ultrasonic-assisted magnetic grinding technology and the alternating magnetic field-assisted grinding technology, the method improves the participation rate of abrasive particles in the polishing process and reduces the processing cost.
The magnetic grinding device based on the dynamic magnetic field assistance adopts magnetic fluid as a magnetic abrasive, the magnetic fluid is a magnetic composite fluid formed by mixing grinding fluid, ferromagnetic particles, plant cellulose and abrasive particles, the magnetic composite fluid can effectively roll under the action of the dynamic magnetic field, high-efficiency polishing is realized, the magnetic grinding device is an environment-friendly material, the cost is low, the consumption is low, the only consumable is the grinding fluid, the grinding fluid contains 97% of water, and the magnetic grinding device has no toxicity and fire hazard and completely accords with the environment-friendly emission standard.
Example two
The present embodiment also proposes another magnetic grinding device 100 based on dynamic magnetic field assistance, which is different from the first embodiment only in that an electromagnet is used to replace the permanent magnet in the first embodiment, meanwhile, no magnet moving assembly is provided, and any one electromagnet is simultaneously arranged on the periphery of the pipe 2 to be polished through a fixed support. Except for this, the rest is the same as the first embodiment, and will not be described here again.
The present embodiment will be specifically described below by taking the arrangement of three groups of electromagnets as an example.
The three electromagnets are uniformly distributed on the periphery of the pipe fitting 2 to be polished at intervals; any electromagnet is provided with independent current coils, one of the current coils can be switched back and forth between the power-on state and the power-off state for multiple times, so that the distribution of magnetic force lines between the three electromagnets is changed, and the effect that abrasive particles turn over along with the change of the magnetic force lines is achieved.
In the embodiment, three electromagnets are uniformly distributed around the pipe fitting 2 to be polished at 120 degrees, and the current coil of one electromagnet is electrified and de-electrified reciprocally according to a certain frequency, so that the magnetic field is correspondingly changed according to the frequency of electrification and de-electrification, and the effect of rolling and updating abrasive particles at the moment is achieved. Compared with the magnetic grinding and polishing technology and the rotary magnetic pole auxiliary polishing technology, the technology improves the polishing efficiency and the surface quality; compared with the ultrasonic-assisted magnetic grinding technology and the alternating magnetic field-assisted grinding technology, the method improves the participation rate of abrasive particles in the polishing process and reduces the processing cost.
It should be noted that it will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present invention; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (6)
1. Magnetic grinding device based on dynamic magnetic field assistance, characterized by comprising:
the workpiece transmission mechanism is used for installing a pipe fitting to be polished and driving the pipe fitting to be polished to rotate; the workpiece transmission mechanism comprises a first base, a transmission assembly, a three-jaw chuck and a centering frame, wherein a first motor and a spindle seat are arranged on the first base, and a spindle is rotatably arranged on the spindle seat; the transmission assembly comprises a driving wheel, a driven wheel and a transmission belt, wherein the driving wheel is connected with the first motor, the driven wheel is connected with one end of the main shaft, and the driving wheel is connected with the driven wheel through the transmission belt; the three-jaw chuck is arranged at the other end of the main shaft and used for clamping one end of the pipe fitting to be polished; the centering frame comprises a second base, a first cantilever beam, a second cantilever beam and a guide assembly, wherein a stand column is vertically arranged on the second base, the first cantilever beam is perpendicular to the pipe fitting to be polished, one end of the first cantilever beam is arranged on the stand column, the position of the first cantilever beam along the height direction of the stand column is adjustable, the second cantilever beam is perpendicular to the pipe fitting to be polished and is positioned below the first cantilever beam, one end of the second cantilever beam is arranged on the stand column, and the position of the second cantilever beam along the height direction of the stand column is adjustable; the guide assembly comprises three groups of pulleys, one group of pulleys are rotatably arranged at the other end of the first cantilever beam, two groups of pulleys are rotatably arranged at the other end of the second cantilever beam along the length extending direction of the second cantilever beam, the rotation axis of any pulley is parallel to the axis of the pipe fitting to be polished, and the pulleys on the first cantilever beam are positioned between the two groups of pulleys on the second cantilever beam; the other end of the pipe fitting to be polished is inserted between the first cantilever beam and the second cantilever beam and is in rolling contact with any pulley;
the magnetic field auxiliary mechanism comprises a static magnet, a dynamic magnet and a magnet moving assembly; the static magnet is arranged on one side of the pipe fitting to be polished through a static magnet clamp, the dynamic magnet is arranged on the magnet moving assembly, and the dynamic magnet is positioned on the other side of the pipe fitting to be polished and is driven by the magnet moving assembly to be close to and far away from the static magnet, so that the distribution of magnetic force lines between the static magnet and the dynamic magnet is changed; the static magnet comprises a second permanent magnet and a third permanent magnet, and the dynamic magnet is a dynamic permanent magnet; the second permanent magnet, the third permanent magnet and the dynamic permanent magnet are distributed on the periphery of the pipe fitting to be polished at intervals, wherein one of the second permanent magnet and the third permanent magnet and the dynamic permanent magnet is arranged with the S pole facing the pipe fitting to be polished, and the other of the second permanent magnet and the third permanent magnet is arranged with the N pole facing the pipe fitting to be polished; or one of the second permanent magnet and the third permanent magnet and the dynamic permanent magnet are arranged with N poles facing the pipe fitting to be polished, and the other one of the second permanent magnet and the third permanent magnet is arranged with S poles facing the pipe fitting to be polished; when the dynamic permanent magnet is positioned at the position closest to the pipe fitting to be polished, the second permanent magnet, the third permanent magnet and the dynamic permanent magnet are uniformly distributed on the periphery of the pipe fitting to be polished in a circumferential manner;
the magnetic abrasive is used for being filled at a position to be polished in the pipe fitting to be polished, and comprises ferromagnetic particles and abrasive particles, wherein the abrasive particles are arranged at the position to be polished along the magnetic force lines and can turn over along with the change of the magnetic force lines.
2. The dynamic magnetic field assisted magnetic grinding device according to claim 1, wherein the stationary magnet comprises a first permanent magnet, and the dynamic magnet is a dynamic permanent magnet; the N pole of the first permanent magnet is arranged opposite to the S pole of the dynamic permanent magnet; or the S pole of the first permanent magnet is arranged opposite to the N pole of the dynamic permanent magnet.
3. The dynamic magnetic field assisted magnetic grinding apparatus of claim 1, wherein the magnet moving assembly comprises:
the wire rail is perpendicular to the pipe fitting to be polished;
the lead screw sliding block assembly comprises a lead screw and a linear rail displacement table in threaded connection with the lead screw, the lead screw is parallel to the linear rail and is rotatably arranged on the linear rail, and the linear rail displacement table is in sliding fit with the linear rail;
one end of the screw rod, which is far away from the pipe fitting to be polished, is connected with a second motor;
and the dynamic magnet clamp is arranged on the linear rail displacement table and is used for installing the dynamic magnet.
4. The dynamic magnetic field assisted magnetic grinding apparatus according to any one of claims 1 to 2, wherein the magnetic abrasive is a magnetic fluid, which is a mixture of an abrasive liquid, the ferromagnetic particles, and the abrasive particles.
5. The dynamic magnetic field assisted magnetic grinding apparatus of claim 3 further comprising a control mechanism electrically coupled to the first motor and the second motor.
6. Magnetic grinding device based on dynamic magnetic field assistance, characterized by comprising:
the workpiece transmission mechanism is used for installing a pipe fitting to be polished and driving the pipe fitting to be polished to rotate;
the magnetic field auxiliary mechanism comprises three electromagnets, and the three electromagnets are distributed on the periphery of the pipe fitting to be polished; any electromagnet is provided with independent current coils, and at least one current coil can be switched back and forth between a power-on state and a power-off state so as to change the distribution of magnetic force lines among the three electromagnets;
the magnetic abrasive is used for being filled at a position to be polished in the pipe fitting to be polished, and comprises ferromagnetic particles and abrasive particles, wherein the abrasive particles are arranged at the position to be polished along the magnetic force lines and can turn over along with the change of the magnetic force lines.
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| CN202210219999.3A CN114473648B (en) | 2022-03-08 | 2022-03-08 | Magnetic grinding device based on dynamic magnetic field assistance |
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| CN202210219999.3A CN114473648B (en) | 2022-03-08 | 2022-03-08 | Magnetic grinding device based on dynamic magnetic field assistance |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6267651B1 (en) * | 2000-01-10 | 2001-07-31 | Qed Technologies, Inc. | Magnetic wiper |
| CN201178721Y (en) * | 2008-02-20 | 2009-01-14 | 王健 | Health care shoes with fixed magnet block and movable magnet block on bottom |
| CN202804889U (en) * | 2012-07-20 | 2013-03-20 | 武汉理工大学 | Magnetically-adjustable magnetofluid grinding tester |
| CN102953035B (en) * | 2012-11-02 | 2014-04-09 | 温州职业技术学院 | Multi-mode atternation coupling magnetic field assisted electrical arc ion plating deposition arc source apparatus |
| CN205508228U (en) * | 2016-01-26 | 2016-08-24 | 北京天强创业电气技术有限责任公司 | Developments magnetic field and magnetic line of force science popularization display device |
| CN110253346A (en) * | 2019-07-09 | 2019-09-20 | 辽宁科技大学 | A kind of rotary slotted magnetic pole polishing inner surface of pipe fitting device and method |
| CN112476064A (en) * | 2019-09-11 | 2021-03-12 | 长春工业大学 | Vibration-assisted magnetic abrasive polishing device and method for microstructure |
| CN112222956A (en) * | 2020-10-15 | 2021-01-15 | 长春工业大学 | Polishing device, polishing method and application based on dynamic magnetic field |
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