CN109848833B - Method and device for polishing inner surface of long straight pipe by electromagnetic-peristaltic composite grinding - Google Patents
Method and device for polishing inner surface of long straight pipe by electromagnetic-peristaltic composite grinding Download PDFInfo
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- CN109848833B CN109848833B CN201910073339.7A CN201910073339A CN109848833B CN 109848833 B CN109848833 B CN 109848833B CN 201910073339 A CN201910073339 A CN 201910073339A CN 109848833 B CN109848833 B CN 109848833B
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Abstract
The invention relates to a method and a device for grinding and polishing the inner surface of a long straight pipe by electromagnetic-peristaltic composite grinding and polishing, comprising a base box body, an abrasive particle updating and storing device, an abrasive particle conveying pipe, a conversion head, a magnetic field generating device, a clamp device, an abrasive particle recycling pipe and a reciprocating device. The advantages are that: the finishing processing of the inner surface of the long straight pipe is realized, the pipe fitting stationary rotating electromagnetic field is adopted for grinding, and the phenomena of deflection and tail flicking caused by the rotation of the workpiece are avoided; the abrasive can be automatically replaced, so that the processing efficiency and the service life of the pipe fitting are improved.
Description
Technical Field
The invention relates to a method and a device for polishing the inner surface of a long straight pipe by electromagnetic-peristaltic composite grinding.
Background
Along with the development of high-precision technical industries such as aerospace, medical appliances and the like, higher requirements are also put forward on the quality of the inner surfaces of long straight pipes with different apertures. The uneven quality of the inner surface of the pipe fitting can lead to uneven pressure and flow velocity of gas or liquid in the pipe fitting to generate surge phenomenon, and the service life of the pipe fitting is reduced. Finishing the inner surface of a long straight pipe (the diameter is 2-200mm, and the length is more than 2 m) is difficult to realize by the traditional method.
Chinese patent publication No. CN203236309U discloses a magnetic force grinding device for synchronous polishing of inner and outer surfaces of a straight pipe, chinese patent publication No. CN108326639a discloses a precise grinding device and process for inner and outer surfaces of an elongated pipe, both devices can grind and polish inner walls of the pipe, but when the long straight pipe is grinded and polished, deflection, tail flick and other phenomena can occur due to rotation of the pipe, so that the pipe collides with the grinding device, and the pipe is damaged. If a plurality of short straight pipes are processed, although a better grinding effect can be achieved, the end parts of the short pipes need to be cut and wasted, and the yield is far lower than that of the long straight pipes. Meanwhile, in the prior art, the grinding track for the finishing processing of the inner wall of the pipe is single, the self-sharpening property of the magnetic grinding particles cannot be well updated, and the grinding efficiency is low.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method and a device for polishing the inner surface of a long straight pipe by magnetic-peristaltic composite grinding, which can realize the finishing processing of the inner surface of the long straight pipe, adopt a rotating electromagnetic field to grind, and avoid the phenomena of deflection and tail flicking caused by workpiece rotation and collision. The grinding material recycling device is beneficial to recycling the grinding material, the grinding material is automatically replaced, the grinding track is complicated, and the processing efficiency and the service life of the pipe fitting are improved.
In order to achieve the above purpose, the present invention is realized by the following technical scheme:
the device comprises a base box body, an abrasive particle updating and storing device, an abrasive particle conveying pipe, a conversion head, a magnetic field generating device, a clamp device, an abrasive particle recycling pipe and a reciprocating device, wherein the abrasive particle updating and storing device is arranged in the base box body;
the reciprocating device comprises a slide rail baffle plate, a fixture device fixing plate, a slide rail, a magnetic field generating device fixing plate, a screw rod, a bearing, a coupler, a motor base, a slide rail base, a slide block locking screw and a screw nut; a sliding rail is fixed on a sliding rail base fixed on the base box body, two ends of the sliding rail are fixedly connected with sliding rail baffles, one end of a screw rod is connected with a motor through a coupler, the other end of the screw rod is connected with the sliding rail baffles through a bearing, the screw rod is in threaded connection with a screw nut, and the screw nut is fixedly connected with a fixing plate of the magnetic field generating device; a plurality of sliding blocks are arranged on the sliding rail; the fixture device fixing plate and the magnetic field generating device fixing plate are respectively fixed on the sliding block; the motor is fixed on the base box body through the motor base; the fixture device fixing plate is fixedly connected with the fixture device, the magnetic field generating device fixing plate is fixedly connected with the magnetic field generating device, the motor drives the screw rod to rotate, and the screw rod drives the screw nut to drive the magnetic field generating device to move; the sliding block is fixedly connected with the sliding rail through a sliding block locking screw.
The magnetic field generating device comprises a magnetic pole frame, an adjusting screw, an electromagnet and a magnetic yoke, wherein the electromagnet is fixed on the magnetic pole frame, a through hole is formed in the middle of the magnetic yoke, a pipe fitting can pass through the through hole, magnetic pole frame positioning holes are uniformly distributed on the circumference of the magnetic yoke, the electromagnet is fixedly connected with the magnetic pole frame, and the magnetic pole frame is fixedly connected with the magnetic yoke through the adjusting screw and the magnetic pole frame positioning holes; the magnetic yoke is fixedly connected with the magnetic field generating device fixing plate.
The magnetic pole frame is provided with a long hole, the adjusting screw penetrates through the long hole to be fixedly connected with the magnetic yoke, and the magnetic pole frame is of an L-shaped structure.
The abrasive particle updating and storing device comprises an abrasive particle storing box, a peristaltic pump, a stirring motor, a box cover, a stirring shaft coupler and a stirring brush, wherein the abrasive particle storing box is fixedly arranged in a machine seat box body; the peristaltic pump is fixedly arranged on the base box body; one end of the abrasive particle conveying pipe passes through the peristaltic pump to be connected with the conversion head, and the other end of the abrasive particle conveying pipe extends into the abrasive particle storage box through the box cover; one end of the abrasive particle recovery pipe is connected with the conversion head, and the other end of the abrasive particle recovery pipe extends into the abrasive particle storage box through the box cover.
The fixture device comprises a claw, a chuck seat, a gauge seat knob, a magnetic gauge seat and a chuck seat fixing hole, wherein the claw is embedded in the chuck, the chuck is hollow, a pipe fitting can pass through the chuck, the chuck seat is locked and fixed with the chuck, the chuck seat is provided with the chuck seat fixing hole, the chuck seat is fixed on the magnetic gauge seat through the chuck seat fixing hole and a bolt, and the gauge seat knob is arranged above the magnetic gauge seat.
Still include the control box, the control box is installed in the upper right side of base box, has arranged display screen and operating panel on the control box.
The fixture devices are arranged on two sides of the reciprocating device, the magnetic field generating devices are arranged between the two fixture devices, and the number of the magnetic field generating devices is more than 2.
A method for polishing the inner surface of a long straight pipe by magnetic-peristaltic composite grinding comprises the following steps:
1) The pipe fitting passes through the clamp devices on two sides and the middle magnetic field generating device, the machining length is adjusted, a magnetic meter seat on the clamp devices on two sides and a sliding block locking screw on the reciprocating device are locked, a magnetic pole frame on the magnetic field generating device is adjusted, the distance between an electromagnet and the pipe fitting is ensured to be less than 3mm, and the adjusting screw is locked;
2) Uniformly stirring magnetic grinding particles, water-based grinding liquid and water according to the proportion of 2:3:5, pouring the mixture into an abrasive grain storage box, and placing a box cover on the abrasive grain storage box;
3) Setting the magnetic field intensity of the electromagnet through an operation panel; setting the direction of the current flowing through the electromagnet and the energizing time of an electric pulse signal, namely the energizing time of the electromagnet;
the grinding pressure generated by the magnetic grinding is as follows:
in the formula (1), B is magnetic induction intensity, mu m Relative permeability, mu, of the magnetic abrasive particles 0 For air permeability, 4 pi×10 is taken -7 H/m, wherein the grinding pressure P is in direct proportion to the square of the magnetic induction intensity B, the larger the grinding pressure is, the larger the grinding pressure of the magnetic brush on the inner surface of the pipe fitting is, the larger the material removal amount is, the higher the grinding efficiency is, and when two magnetic poles form an N-S loop, the magnetic pole loop distance is short, and the magnetic induction intensity between the magnetic poles is larger;
4) Starting a stirring motor to uniformly distribute magnetic grinding particles in flowing liquid, starting a peristaltic pump, generating a rotating magnetic field by an electromagnet, and adsorbing the magnetic grinding particles to form a magnetic brush; the electromagnet is powered off to realize the replacement of the magnetic grinding particle cutting edge at the moment of power-off, the magnetic brush is pressed on the inner surface of the pipe fitting in a profiling way, the motor drives the screw rod to rotate, the screw rod drives the magnetic field generating device to reciprocate on the screw rod, the magnetic particle brush rotates along with the magnetic pole along with the reciprocating movement of the magnetic field generating device along the pipe fitting, a spiral grinding track is formed on the inner surface of the pipe fitting, and the magnetic particle brush and the pipe fitting generate relative motion; the magnetic particle brush is used for continuously wiping and scoring the inner surface of the pipe fitting, so that the micro grinding of the inner surface of the pipe fitting is realized, and the finishing processing of the inner surface of the pipe fitting is finished.
Compared with the prior art, the invention has the beneficial effects that:
the invention realizes the finishing processing of the inner surface of the long straight pipe, adopts the pipe fitting stationary rotating electromagnetic field to grind, and avoids the phenomena of deflection and tail flick caused by the rotation of the workpiece, and collision occurs. The abrasive particle updating and storing device is favorable for recycling the abrasive particles, the abrasive particles can be automatically replaced, and the magnetic field generating device is combined to complicate the grinding track, so that the processing efficiency is improved, and the service life of the pipe fitting is prolonged. Compared with the permanent magnet, the electromagnet can better control the on-off of magnetism, so that the utilization rate of the magnetic brush is improved, and the working efficiency is further improved. The problem of traditional long straight tube rotation produces the deflection and interferes is solved, degree of automation is high, solves the abrasive grain and changes the problem many times, practices thrift the cost, green.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic structural view of the reciprocating means.
Fig. 3 is a schematic view of the installation of a nut.
Fig. 4 is a schematic structural view of the magnetic field generating device.
Fig. 5 is a schematic view of the structure of the abrasive grain update storage device.
Fig. 6 is a schematic structural view of the clamp device.
Fig. 7 is a schematic view of a conventional polishing track.
FIG. 8 is a schematic representation of the abrasive track of the method of the present invention.
In the figure: the grinding wheel device comprises a machine seat box body 2-a grinding wheel updating storage device 3-a grinding wheel conveying pipe 4-a conversion head 5-a magnetic field generating device 6-a pipe fitting 7-a clamp device 8-a grinding wheel recovery pipe 9-a reciprocating device 10-a control box 11-a display screen 12-an operation panel 13-a box body door 14-a sliding rail baffle 15-a clamp device fixing plate 16-a sliding rail 17-a magnetic field generating device fixing plate 18-a lead screw 19-a bearing 20-a coupling 21-a motor 22-a motor base 23-a sliding rail base 24-a sliding block 25-a sliding block locking screw 26-a magnetic pole frame 27-a magnetic pole frame positioning hole 28-an adjusting screw 29-an electromagnet 30-a magnetic yoke 31-a fixing hole 32-a grinding wheel storage box 33-a peristaltic pump 34-a stirring motor 35-a box cover 36-a stirring coupling 37-a stirring brush 38-a claw 39-a chuck 40-a chuck seat 41-a gauge knob 42-a magnetic gauge seat 43-a chuck seat fixing hole 44-a screw nut.
Detailed Description
The present invention will be described in detail below with reference to the drawings of the specification, but it should be noted that the practice of the present invention is not limited to the following embodiments.
Referring to fig. 1, a device for grinding and polishing the inner surface of a long straight tube by magnetic-peristaltic composite grinding and polishing comprises a base box body 1, a grinding particle updating and storing device 2, a grinding particle conveying pipe 3, a conversion head 4, a magnetic field generating device 5, a clamp device 7, a grinding particle recycling pipe 8 and a reciprocating device 9, wherein the grinding particle updating and storing device 2 is arranged in the base box body 1, one end of a pipe fitting 6 is communicated with the grinding particle conveying pipe 3 through the conversion head 4, the other end of the pipe fitting is communicated with the grinding particle recycling pipe 8 through the conversion head 4, the other end of the grinding particle conveying pipe 3 and the other end of the grinding particle recycling pipe 8 are connected with the grinding particle updating and storing device 2 in a box manner, the reciprocating device 9 is fixed on the base box body 1, and the clamp device 7 and the magnetic field generating device 5 are arranged on the reciprocating device 9; the base box body 1 is also provided with a control box 10, the control box 10 is arranged at the upper right side of the base box body 1, and a display screen 11 and an operation panel 12 are arranged on the control box 10. The clamp devices 7 are arranged on two sides of the reciprocating device 9, the magnetic field generating devices 5 are arranged between the two clamp devices 7, and the number of the magnetic field generating devices 5 is more than 2.
Referring to fig. 2 and 3, the reciprocating device 9 includes a slide rail baffle 14, a fixture device fixing plate 15, a slide rail 16, a magnetic field generating device fixing plate 17, a screw 18, a bearing 19, a coupling 20, a motor 21, a motor base 22, a slide rail base 23, a slide block 24, a slide block locking screw 25, and a screw 44; a slide rail 16 is fixed on a slide rail base 23 fixed on the base box 1, two ends of the slide rail 16 are fixedly connected with a slide rail baffle 14, one end of a lead screw 18 is connected with a motor 21 through a coupler 20, and the other end is connected with the slide rail baffle 14 through a bearing 19; a plurality of sliding blocks 24 are arranged on the sliding rail 16, and a nut 44 on the magnetic field generating device fixing plate 17 is in threaded connection with the lead screw 18; the fixture device fixing plate 15 and the magnetic field generating device fixing plate 17 are respectively fixed on the slide block 24; the fixture device fixing plate 15 is fixedly connected with the fixture device 7, the magnetic field generating device fixing plate 17 is fixedly connected with the magnetic field generating device 5, and the motor 21 is fixed on the base box 1 through the motor base 22; the motor 21 drives the screw rod 18 to rotate, the screw rod 18 drives the screw nut 44 to reciprocate on the screw rod 18, so that the magnetic field generating device 5 moves and the clamp device 7 cannot be driven to reciprocate; the slide block 24 for fixing the fixture device fixing plate 15 is manually adjusted, so that the slide block 24 moves relative to the slide rail 16, and the position of the fixture device 7 is adjusted, and the slide block 24 is fixedly connected with the slide rail 16 through the slide block locking screw 25.
Referring to fig. 4, the magnetic field generating device 5 includes a magnetic pole frame 26, an adjusting screw 28, an electromagnet 29, and a magnetic yoke 30, wherein the electromagnet 29 is fixed on the magnetic pole frame 26, a through hole is provided in the middle of the magnetic yoke 30, a pipe fitting 6 can pass through the through hole, magnetic pole frame positioning holes 27 are uniformly distributed on the circumference of the magnetic yoke 30, the electromagnet 29 is fixedly connected with the magnetic pole frame 26, and the magnetic pole frame 26 is fixedly connected with the magnetic yoke 30 through the adjusting screw 28 and the magnetic pole frame positioning holes 27; the yoke 30 is provided with a fixing hole 31, and the yoke 30 is fixedly connected to the magnetic field generating device fixing plate 17 by the fixing hole 31. The magnetic pole frame 26 is provided with a long hole, the adjusting screw 28 passes through the long hole and is fixedly connected with the magnetic yoke 30, the magnetic pole frame 26 is of an L-shaped structure, the short side part is used for installing the electromagnet 29, and the long side part is provided with a long hole.
Referring to fig. 5, the abrasive particle updating and storing device 2 comprises an abrasive particle storing box 32, a peristaltic pump 33, a stirring motor 34, a box cover 35, a stirring shaft coupler 36 and a stirring brush 37, wherein the abrasive particle storing box 32 is fixedly arranged in the base box 1, the box cover 35 is fixed on the abrasive particle storing box 32, the stirring motor 34 is fixed on the box cover 35, and an output shaft of the stirring motor 34 is connected with the stirring brush 37 extending into the abrasive particle storing box 32 through the stirring shaft coupler 36; peristaltic pump 33 is fixedly mounted on base box 1; one end of the abrasive particle conveying pipe 3 passes through the peristaltic pump 33 to be connected with the conversion head 4, and the other end of the abrasive particle conveying pipe extends into the abrasive particle storage box 32 through the box cover 35; one end of the abrasive grain recovery pipe 8 is connected with the conversion head 4, and the other end extends into the abrasive grain storage box 32 through the box cover 35.
Referring to fig. 6, the fixture device 7 includes a claw 38, a chuck 39, a chuck seat 40, a gauge seat knob 41, a magnetic gauge seat 42, and a chuck seat fixing hole 43, where the claw 38 is embedded in the chuck 39, the chuck 39 is hollow, the pipe 6 can pass through the chuck 39, the chuck seat 40 locks and fixes the chuck 39, the chuck seat 40 is provided with the chuck seat fixing hole 43, the chuck seat 40 is fixed on the magnetic gauge seat 42 through the chuck seat fixing hole 43 and a bolt, the gauge seat knob 41 is installed above the magnetic gauge seat 42, and the magnetic gauge seat 42 is fixed on the fixture device fixing plate 15 by screwing the gauge seat knob 41.
Referring to fig. 7, in the conventional magnetic grinding method, the peripheral magnetic pole rotates to drive the magnetic grinding particles to make a reciprocating spiral track along the axial direction of the pipe fitting 6, the grinding track is single, and the grinding efficiency is low; referring to fig. 8, in the electromagnetic-peristaltic composite grinding and polishing long straight pipe grinding method, on the existing grinding track, a peristaltic pump 33 is added to supply the magnetic grinding particles to the grinding track along the axial direction of the pipe fitting 6, the grinding tracks are staggered and complicated, the intersecting angle of the tracks is small, and the grinding is uniform and compact.
Referring to fig. 1-8, the method for polishing the inner surface of the long straight pipe by magnetic-peristaltic composite grinding comprises the following steps:
1) The pipe fitting 6 passes through the two side clamp devices 7 and the middle magnetic field generating device 5, the machining length is adjusted, the magnetic gauge stand 42 on the two side clamp devices 7 and the sliding block locking screw 25 on the reciprocating device 9 are locked, the magnetic pole frame 26 on the magnetic field generating device 5 is adjusted, the distance between the electromagnet 29 and the pipe fitting 6 is ensured to be less than 3mm, and the adjusting screw 28 is locked;
2) Magnetic abrasive particles, water-based abrasive liquid, and water were mixed in a ratio of 2:3:5 (example: 500g of magnetic grinding particles, 750ml of water-based grinding fluid and 1250ml of water) are uniformly mixed and poured into the grinding particle storage box 32, and the box cover 35 is arranged on the grinding particle storage box 32;
3) The magnetic field intensity of the electromagnet 29 (example: the magnetic field strength B is 0.5 to 0.6 tesla); setting the rotation speed and grinding time of a rotating magnetic field N-N-S-S generated by the electromagnet 29, the direction of the current flowing through the electromagnet 29 and the energizing time of an electric pulse signal, namely the energizing time of the electromagnet 29; peristaltic rate was set at 35rpm;
the grinding pressure generated by the magnetic grinding is as follows:
in the formula (1): b is magnetic induction intensity, mu m Relative permeability, mu, of the magnetic abrasive particles 0 For air permeability, 4 pi×10 is taken -7 H/m。
The larger the grinding pressure is, the larger the material removal amount is, and the higher the grinding efficiency is. When two magnetic poles form an N-S loop, the magnetic pole loop is close, and the magnetic induction intensity between the magnetic poles is larger.
4) The stirring motor 34 is started to uniformly distribute the magnetic grinding particles in the flowing liquid, the peristaltic pump 33 is started, the electromagnet 29 generates a rotating magnetic field, the positive current is set to be N level, and the negative current is set to be S level, as shown in fig. 4. Electromagnet 29a is electrified with positive current, electromagnet 29b is electrified with negative current for 2s; electromagnet 29a is powered off, electromagnet 29b is powered on with positive current, electromagnet 29c is powered on with negative current, and the electromagnet is powered on for 2s; electromagnet 29b is powered off, electromagnet 29c is powered on with positive current, electromagnet 29d is powered on with negative current, and the electromagnet is powered on for 2s; electromagnet 29c is powered off, electromagnet 29d is powered on with positive current, electromagnet 29a is powered on with negative current, and the electromagnet is powered on for 2s; and the rotating magnetic field is formed by sequentially circulating, and the rotating speed is controlled by the energizing time. The direction of energization of electromagnet 29 is shown in the following table:
| S 1 | S 2 | S 3 | S 4 | |
| a | N | |||
| b | S | N | ||
| c | S | N | ||
| d | S | N |
adsorbing the magnetic grinding particles to form a magnetic brush; the electromagnet 29 is powered off to realize the replacement of the magnetic grinding particle cutting edge at the moment of power-on, the magnetic brush is pressed on the inner surface of the pipe fitting 6 in a profiling way, the motor 21 drives the screw rod 18 to rotate, the screw rod 18 drives the magnetic field generating device 5 to reciprocate on the screw rod 18, and the magnetic particle brush rotates along with the magnetic pole along with the reciprocating movement of the magnetic field generating device 5 along with the pipe fitting 6, so that a spiral grinding track is formed on the inner surface of the pipe fitting 6 and generates relative movement with the pipe fitting 6; the inner surface of the pipe fitting 6 is continuously rubbed and scored by the magnetic particle brush, so that the micro grinding of the inner surface of the pipe fitting 6 is realized, and the finishing processing of the inner surface of the pipe fitting 6 is finished.
According to the invention, the pipe fitting 6 is fixed by the fixture device 7, and the finishing processing of the inner surface of the pipe fitting 6 can be realized by utilizing the magnetic grinding method under the condition that the pipe fitting 6 is not moved, and the abrasive can be used for multiple times, so that the replacement of the cutting edge of the magnetic grinding particle is facilitated, the service life of the magnetic grinding particle is prolonged, the grinding track is complicated, and the grinding efficiency is improved. The problem of traditional long straight tube rotation produces the deflection and interferes is solved, solves the abrasive grain and changes the problem many times, practices thrift the cost, green.
Claims (7)
1. The device for polishing the inner surface of the long straight pipe by magnetic-peristaltic composite grinding is characterized by being used for measuring the diameter: finishing the inner surface of a long straight pipe with the length of 2-200mm and the length of more than 2 m; the device comprises a base box body, an abrasive particle updating and storing device, an abrasive particle conveying pipe, a conversion head, a magnetic field generating device, a clamp device, an abrasive particle recycling pipe and a reciprocating device, wherein the abrasive particle updating and storing device is arranged in the base box body;
the reciprocating device comprises a slide rail baffle plate, a fixture device fixing plate, a slide rail, a magnetic field generating device fixing plate, a screw rod, a bearing, a coupler, a motor base, a slide rail base, a slide block locking screw and a screw nut; a sliding rail is fixed on a sliding rail base fixed on the base box body, two ends of the sliding rail are fixedly connected with sliding rail baffles, one end of a screw rod is connected with a motor through a coupler, the other end of the screw rod is connected with the sliding rail baffles through a bearing, the screw rod is in threaded connection with a screw nut, and the screw nut is fixedly connected with a fixing plate of the magnetic field generating device; a plurality of sliding blocks are arranged on the sliding rail; the fixture device fixing plate and the magnetic field generating device fixing plate are respectively fixed on the sliding block; the motor is fixed on the base box body through the motor base; the fixture device fixing plate is fixedly connected with the fixture device, the magnetic field generating device fixing plate is fixedly connected with the magnetic field generating device, the motor drives the screw rod to rotate, and the screw rod drives the screw nut to drive the magnetic field generating device to move; the sliding block is fixedly connected with the sliding rail through a sliding block locking screw;
the method for polishing the inner surface of the long straight pipe by magnetic-peristaltic composite grinding is characterized by comprising the following steps of:
1) The pipe fitting passes through the clamp devices on two sides and the middle magnetic field generating device, the machining length is adjusted, a magnetic meter seat on the clamp devices on two sides and a sliding block locking screw on the reciprocating device are locked, a magnetic pole frame on the magnetic field generating device is adjusted, the distance between an electromagnet and the pipe fitting is ensured to be less than 3mm, and the adjusting screw is locked;
2) Uniformly stirring magnetic grinding particles, water-based grinding liquid and water according to the proportion of 2:3:5, pouring the mixture into an abrasive grain storage box, and placing a box cover on the abrasive grain storage box;
3) Setting the magnetic field intensity of the electromagnet through an operation panel; setting the direction of the current flowing through the electromagnet and the energizing time of an electric pulse signal, namely the energizing time of the electromagnet;
the grinding pressure generated by the magnetic grinding is as follows:
in the formula (1), B is magnetic induction intensity, mu m Relative permeability, mu, of the magnetic abrasive particles 0 For air permeability, 4 pi×10 is taken -7 H/m, wherein the grinding pressure P is in direct proportion to the square of the magnetic induction intensity B, the larger the grinding pressure is, the larger the grinding pressure of the magnetic brush on the inner surface of the pipe fitting is, the larger the material removal amount is, the higher the grinding efficiency is, and when two magnetic poles form an N-S loop, the magnetic pole loop distance is short, and the magnetic induction intensity between the magnetic poles is larger;
4) Starting a stirring motor to uniformly distribute magnetic grinding particles in flowing liquid, starting a peristaltic pump, generating a rotating magnetic field by an electromagnet, and adsorbing the magnetic grinding particles to form a magnetic brush; the electromagnet is powered off to realize the replacement of the magnetic grinding particle cutting edge at the moment of power-off, the magnetic brush is pressed on the inner surface of the pipe fitting in a profiling way, the motor drives the screw rod to rotate, the screw rod drives the magnetic field generating device to reciprocate on the screw rod, the magnetic particle brush rotates along with the magnetic pole along with the reciprocating movement of the magnetic field generating device along the pipe fitting, a spiral grinding track is formed on the inner surface of the pipe fitting, and the magnetic particle brush and the pipe fitting generate relative motion; the magnetic particle brush is used for continuously wiping and scoring the inner surface of the pipe fitting, so that the micro grinding of the inner surface of the pipe fitting is realized, and the finishing processing of the inner surface of the pipe fitting is finished.
2. The device for grinding and polishing the inner surface of a long straight tube by combining magnetism and peristalsis according to claim 1, wherein the magnetic field generating device comprises a magnetic pole frame, an adjusting screw, an electromagnet and a magnetic yoke, wherein the electromagnet is fixed on the magnetic pole frame, a through hole is arranged in the middle of the magnetic yoke, a pipe fitting can pass through the through hole, magnetic pole frame positioning holes are uniformly distributed on the circumference of the magnetic yoke, the electromagnet is fixedly connected with the magnetic pole frame, and the magnetic pole frame is fixedly connected with the magnetic yoke through the adjusting screw and the magnetic pole frame positioning holes; the magnetic yoke is fixedly connected with the magnetic field generating device fixing plate.
3. The device for polishing the inner surface of the long straight tube by magnetic-peristaltic composite grinding of claim 2, wherein the magnetic pole frame is provided with a long hole, the adjusting screw is fixedly connected with the magnetic yoke through the long hole, and the magnetic pole frame is of an L-shaped structure.
4. The device for grinding and polishing the inner surface of the long straight tube by the magnetic-peristaltic composite grinding and polishing device according to claim 1, wherein the abrasive particle updating and storing device comprises an abrasive particle storage box, a peristaltic pump, a stirring motor, a box cover, a stirring shaft coupling and a stirring brush, the abrasive particle storage box is fixedly arranged in a machine seat box body, the box cover is fixedly arranged on the abrasive particle storage box, the stirring motor is fixedly arranged on the box cover, and an output shaft of the stirring motor is connected with the stirring brush extending into the abrasive particle storage box through the stirring shaft coupling; the peristaltic pump is fixedly arranged on the base box body; one end of the abrasive particle conveying pipe passes through the peristaltic pump to be connected with the conversion head, and the other end of the abrasive particle conveying pipe extends into the abrasive particle storage box through the box cover; one end of the abrasive particle recovery pipe is connected with the conversion head, and the other end of the abrasive particle recovery pipe extends into the abrasive particle storage box through the box cover.
5. The device for polishing the inner surface of the long straight pipe by magnetic-peristaltic composite grinding is characterized in that the fixture device comprises a clamping jaw, a chuck seat, a gauge seat knob, a magnetic gauge seat and a chuck seat fixing hole, wherein the clamping jaw is embedded in the chuck, the chuck is hollow, a pipe fitting can pass through the chuck, the chuck seat is locked and fixed with the chuck, the chuck seat is provided with the chuck seat fixing hole, the chuck seat is fixed on the magnetic gauge seat through the chuck seat fixing hole and a bolt, and the gauge seat knob is arranged above the magnetic gauge seat.
6. The device for polishing the inner surface of a long straight tube by magnetic-peristaltic composite grinding according to claim 1, further comprising a control box, wherein the control box is arranged on the upper right side of the base box, and a display screen and an operation panel are arranged on the control box.
7. The device for polishing the inner surface of a long straight tube by magnetic-peristaltic composite grinding according to claim 1, which is characterized in that
The clamp devices are arranged at two sides of the reciprocating device, the magnetic field generating device is arranged between the two clamp devices,
the number of the magnetic field generating devices is more than 2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910073339.7A CN109848833B (en) | 2019-01-25 | 2019-01-25 | Method and device for polishing inner surface of long straight pipe by electromagnetic-peristaltic composite grinding |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910073339.7A CN109848833B (en) | 2019-01-25 | 2019-01-25 | Method and device for polishing inner surface of long straight pipe by electromagnetic-peristaltic composite grinding |
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| CN109848833B true CN109848833B (en) | 2023-06-16 |
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