KR101252011B1 - Zig system for polishing of magnetic core and the method for the same - Google Patents

Abstract

PURPOSE: A jig system for polishing a magnetic core and a polishing method are provided to produce magnetic cores in bulk because a polishing process can be performed while a plurality of magnetic cores are fixed on burn. CONSTITUTION: A jig system for polishing a magnetic core comprises a base plate(20), a fixing plate(60), a side plate(40), and a center plate(30). The fixing plate is connected to the upper and lower surfaces of the magnetic core to the right angle direction with respect to the axial direction of the magnetic core while the cross section of the magnetic core(10) faces the top side with respect to the base plate. The side plate is mounted on the base plate so that the cross section of the magnetic core maintains level.

Description

Zig System for Polishing of Magnetic Core and the Method for the same}

The present invention relates to a method for polishing a cut surface of a split magnetic core and a jig system for fixing a core for polishing, and more particularly, to a split core, which is a cut magnetic core, using a jig. It is fixed to maintain a constant fixed state so that the polished surfaces are on a plane, minimizing voids when joining the split cores together, and supplying a coolant during polishing to proceed the polishing. The present invention relates to a magnetic core polishing jig system and a polishing method capable of mass production while maintaining a certain level or more of quality by preventing deformation and deformation of materials.

In general, the magnetic core is produced by winding the iron plate, and the manufactured magnetic core is widely used in sensors, power modules, and the like because the magnetic core becomes a magnetic material, that is, an electromagnet by an induction current. The magnetic core may have various types of structures, but is typically manufactured by using a ring-shaped ring core, which is typically shown in FIG. 1 because an electric current flows through the core. As shown, the ring core is cut in half to form a split core for ease of installation or repair. The split core has a cut surface, and a pair of split cores are bonded to each other so that the cut surfaces correspond to each other in a state where the wires are positioned inside. However, roughened cuts create air gaps, which can be fatal to the function of the magnetic core. In this case, the gap is minimized by realizing the cut surface to be in a mutually flat plane by grinding.

That is, a representative example of the need for such a polishing process is a split core manufacturing process based on a ring core, and presents a problem based on this. After cutting the center of the ring core-based split core manufacturing process, the cutting surface is polished to improve the roughness of the cutting surface or to minimize the air gap between the cutting surfaces generated by the pairing of the pairs in the case of sensors or power modules. There is a case where polishing is required. Such conventional polishing processes are generally divided into three processes, and problems of each process are as follows.

In the polishing step 1, the cutting surface of the core is polished on a disk-paper which rotates on the basis of a rotor. At this time, since the cutting surface of the core is exposed to abrasive stone for a long time, a significant frictional heat is generated on the cutting surface, which results in deformation of the core surface material. In addition, since the process depends on the skill of the operator, the structural deformation of the surface of which the flatness of the core surface is different and the respective surfaces are not coplanar, which is a main cause of voids when the two split cores are combined with each other. Such a manual process or a polishing process that does not take into account misalignment between the surfaces does not allow uniform work between the pairs of the cut cores, and thus increases the voids caused by the misalignment between the core surfaces. It can act as the opposite to worsen.

 In the polishing process 2, a rougher grain (the size of the mesh constituting the pepper) is set on the stone plate (flat plate of stone material), and the polished surface of the split core on which the polishing process 1 is completed is polished. . Coefficient to measure the degree of polishing completion. There is no quantified criterion, but there is no more detailed quantitative reference value except for nonconformities that are highly structurally deformed because they rely on the operator's visual identification. In the case of polishing by human hands, unnecessary radius is generated on the friction surface of the core, which may cause voids between the surfaces of another core.

 In the polishing process 3, all the other processes are the same as in the polishing process 2, and a smaller mesh size is used than the paper used in the polishing process. The problem is also the same.

In addition, since the core (including the split core) becomes a magnetic material, that is, an electromagnet by an induction current, when the excessive heat is applied to the surface of the core during the manufacturing process except the heat treatment (annealing) process, the appearance is the same, It is greatly influenced, and consequently, it is a major cause of the degradation of the efficiency of the core. These problems are particularly serious when the core is used as a sensor or power supply, and the non-uniformity of these products is causing a serious increase in product cost.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a jig system in which a plurality of split cores are fixed so that the cutting surfaces are all horizontally maintained with respect to the polishing machine, and the polishing is supplied while supplying the coolant while the jig is fixed to the jig. By minimizing heat generation during the polishing process of the polishing surface, it is possible to provide a magnetic core polishing jig and a polishing method that can be mass-produced with good quality and standard control within a certain level.

As a specific means for achieving the above object, the present invention is a magnetic core polishing jig system for fixing the magnetic core to be cut along the axial direction and to polish the cut surface A base plate forming a horizontal plane; Upper and lower fixing plates installed on the base plate to be in contact with the upper and lower surfaces of the magnetic core in a direction perpendicular to the axial direction of the magnetic core while the cut surface of the magnetic core is placed upward. ; The magnetic core polishing jig system includes a side plate which is in close contact with the side surface of the magnetic core and is assembled to the base plate so that the cut surface of the magnetic core is horizontal.

Preferably, a center plate in close contact with the upper and lower surfaces of the magnetic core is installed on the upper surface of the base plate.

Preferably, the center plate is fixed by an adjustment bolt fastened through the slot of the slider fixed to the upper surface of the base plate to adjust the position of the center plate in the axial direction.

Preferably, the pinion gear is fitted to the side of the center plate, the rack gear is engaged with the pinion gear on the upper surface of the base plate to adjust the position of the center plate in the axial direction.

Preferably, the upper and lower fixing plates are horizontally fitted to a support installed behind the support plate, and a head of a bolt screwed to the support is rotatably fitted to be positioned along the axial direction.

Preferably, a spring is provided between the support and the upper and lower fixing plates to provide an elastic force for pushing the support toward the magnetic core.

Preferably, the upper and lower fixing plate and the center plate is formed with a pointer of a protruding shape so that the point contact is made to the portion in contact with the magnetic core.

As another specific means for achieving the above object, the present invention is a magnetic core polishing method for cutting a magnetic core made of a wound iron along the axial direction and polishing the cut surface, the plurality of magnetic cores Seating on the jig; Leveling the cut surface of the magnetic core horizontally; Completely fixing the leveled magnetic core to a jig; Grinding the cut surface of the magnetic core fixed to the jig with abrasive stone and simultaneously introducing cooling water; Separating, cleaning and cleaning the magnetic core from the jig.

Preferably, the method includes controlling the temperature within ± 4 ° C of the magnetic core surface temperature before grinding the surface temperature of the magnetic core cut surface in the step of adding cooling water while polishing.

The present invention as described above has the following effects.

(1) Compared to the prior art, the flatness of the surface of the cut surface of the magnetic core is realized by using a rotary grinding machine generated in the prior art by implementing a right angle (90 degrees) between three axes (X, Y, Z axes) coordinate planes. The structural deformation of the magnetic core surface (three-axis failure at right angles) and the minimization of voids generated at the polishing surface during core bonding and the unevenness of quality that depended on the skill of the operator in the precision polishing process are solved. By minimizing the height of the friction surface (working surface), shortening the friction exposure time, and minimizing the frictional heat generated by adding coolant during the polishing process, the magnetic core minimizes the deformation of the core characteristics generated during the machining process. It has the effect of increasing the ultimate magnetic core efficiency compared to the existing method. As a result, it is possible to solve the non-standardity generated by man's manual process, reduction of loss caused by excessive voids when combining split cores, and low productivity due to low efficiency. Extending the ability to work with magnetic cores can also dramatically reduce manufacturing costs. Therefore, the present invention can achieve the effect of realizing the magnetic core of uniform quality in structure, dimensions and performance, and the productivity improvement by reducing the incidence of nonconformity and the manufacturing line divided into the existing three processes into one process. By changing, there is an effect of improving the efficiency of the process.

(2) Mass production system because designing cascade type jig system that can cope with various sizes of magnetic core can respond quickly to change, fix many magnetic cores at once and proceed polishing process There is an effect that the cornerstone can be provided.

1 is a perspective view of a magnetic core polished by the present invention.
2 is a perspective view of a magnetic core polishing jig according to the present invention.
3 is an exploded perspective view of a magnetic core polishing jig according to the present invention.
4 is an operation diagram of a magnetic core polishing jig according to the present invention.
5 is a perspective view of a magnetic core polishing jig according to another embodiment of the present invention.
6 is an exploded perspective view of a magnetic core polishing jig according to another embodiment of the present invention.
7 is a flow chart for the magnetic core polishing method according to the present invention.

The objects, features and advantages of the present invention described above will become more apparent from the following detailed description. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention relates to polishing a cut surface of a magnetic core as described above. Referring to FIG. 1, there is shown a circular core, ie a split core 10 divided in half. Cut in half to form a semicircular shape and a cut surface 11 is formed. The cut surface 11 should be polished. As shown the two cutting planes 11 are parallel because they are cut by one plane. The other part has semi-circular curves, so it can be seen that this is a tricky task even by hand. It is also very difficult to fix the cutting surface 11 to be horizontal.

A jig according to a preferred embodiment of the present invention is shown in FIGS. Referring to the drawings, the jig has a base plate 20 forming a horizontal plane and the magnetic core 10 in a state in which the cutting surface 11 of the magnetic core 10 is placed on the base plate 20 facing upward. The upper and lower fixed plate 60 is fixed to contact the upper and lower surfaces of the magnetic core 10 in a direction perpendicular to the axial direction of the magnetic core 10, and is in close contact with the side surfaces of the magnetic core 10. A side plate 40 assembled to the base plate 20 so that the cutting surface 11 of the core 10 is horizontal, and the magnetic core 10 is in close contact with the upper and lower surfaces and the upper surface of the base plate 20 It includes a center plate 30 installed in.

The base plate 20 is formed of a plate having a constant thickness and forming a horizontal plane, and serves to support the remaining parts of the jig. In addition, the base plate 20 is fixed using an electromagnet method or a mechanical clamp so that the magnetic core 10 can be polished on a horizontal portion of the polishing apparatus in a state where all the magnetic cores 10 are completely installed. As described above, polishing is performed by the abrasive stone 200 as shown in FIG. 4 while the base plate 20 is fixed.

A support plate 21 having an upper surface of an arc shape may be installed on the upper surface of the base plate 20 so as to support the circular arc portion of the magnetic core 10. Installing the support plate 21 may help to level the cut surface 11 more quickly.

Referring to FIG. 3, the upper and lower fixing plates 60 are horizontally fitted to each support 50 installed at the rear thereof, and are bolted to the support 50 to be positioned along the axial direction. The head of 51 is rotatably fitted. The support 50 is vertically erected to be seated in the groove 20c formed on the side of the base plate 20 and fastened to the side fastening hole 20d of the base plate 20 by the fastening bolt 53 to be assembled and fixed. do. Assembling hole 50c formed in the support 50 is formed in the slot type of the upper and lower long holes so that the height of the support 50 can be adjusted. Two guide pins 62 are formed in the upper and lower fixing plates 60, respectively, and the pins 62 are fitted into the guide holes 50a of the support 50, and the upper and lower fixing plates 60 are supported by the support 50. 60) is configured to be supported. A bolt hole 50b is formed between the guide holes 50a, and the adjusting bolt 51 is screwed to the bolt hole 50b, and the end of the adjusting bolt 51 is fixed to the handle 52 to hold the handle. By turning 52, the adjusting bolt 51 and the handle 52 are moved back and forth with respect to the axial direction. The head 51a of the adjustment bolt 51 is fitted into the groove 60a of the upper and lower fixing plates 60, and accordingly, when the adjusting bolt 51 rotates back and forth, the bolt head 51a rotates up and down and the upper and lower fixing plates ( Only 60). The upper and lower fixing plate 60 is formed with a pointer 61 protruding so that the point contact is made in contact with the magnetic core 10. Therefore, the fixing plates 60 and the magnetic core 10 are in point contact, and thus, precise leveling is possible.

The center plate 30 is fixed by the adjusting bolt 23 fastened through the slot 22a of the slider 22 fixed to the upper surface of the base plate 20 in the axial direction of the center plate 30. The position is adjusted. In the center plate 30, a pointer 31 is formed to protrude so that point contact is made at a portion contacting the magnetic core 10. Therefore, the center plate 30 and the magnetic core 10 are in point contact to enable precise horizontal alignment.

The side plate 40 is provided at one side of the base plate 20, and a groove 20b is formed at a portion where the side plate 40 is installed, and the height of the side plate 40 is formed at the groove 20b. Adjustable seat Like the support 50, the side plate 40 is also assembled to the base plate 20 by the adjustment bolt 25, but has a slot-shaped assembly hole 40a formed of upper and lower holes to adjust its height. . Therefore, by adjusting the height of the side plate 40 in accordance with the size of the magnetic core 10 by the operator's choice it is fixed by tightening the adjustment bolt (25).

Work is first fixed to the center plate 30 through the slot 22a of the slider 22 to adjust the adjustment bolt 23 to fit the magnetic core 10 size. The magnetic core 10 is placed on the support plate 21 and the height of the side plate 40 is adjusted to the size of the magnetic core 10 while the upper and lower surfaces of the magnetic core 10 are in contact with the pointer 31 of the center plate 30. While adjusting, the side plate 40 is fixed by tightening the bolt 25 and the magnetic core 10 is adjusted on the support plate 21 so that the side plate 40 and the magnetic core cutting surface 11 are parallel to each other. Then, the handle 52 of the support 50 is rotated so that the pointer 61 of the upper and lower fixing plates 60 comes into close contact with the upper and lower surfaces of the magnetic core 10. This secures the magnetic core 10. When the magnetic core 10 is fixed, polishing is performed according to the flowchart of FIG. 7.

Referring to FIG. 4, the base plate 20 is fixed to the polishing apparatus by using an electromagnet method or a mechanical clamp in a state in which the magnetic cores 10 are fixed to the jig for polishing. In this state, the abrasive stone 200 descends as shown in FIG. 4 to perform polishing.

Referring to Figure 7, the entire magnetic core polishing method is shown. The magnetic core 10 is seated (S1) and the cut surface 11 of the magnetic core 10 is horizontally aligned as described above (S2), and then the magnetic core 10 is completely fixed to the jig (S3). Then, the cutting surface 11 of the magnetic core 10 fixed to the jig is polished with abrasive stone as shown in FIG. 4 and at the same time, the cooling water is added to maintain the temperature of the magnetic core cutting surface 11 between 18.4 and 21.7 degrees. (S4). By doing so, it is possible to completely prevent the change in the physical properties of the cutting surface 11 to ensure the product quality. Finally, after removing and arranging the polished magnetic core 10 from the jig, the next magnetic core 10 is repeatedly polished in the same manner.

Meanwhile, the jig according to the second embodiment of the present invention is shown in FIGS. 5 and 6. As shown, the difference from the previous embodiment is that the spring 100 is installed between the support 50 and the upper and lower fixing plate 60, and the point of changing the axial feed and fixation of the center plate 30 in gear form. to be.

Base plate 20, side plate 40, the upper and lower fixing plate 60 and the support 50 is the same in configuration as the previous embodiment. Therefore, the work of leveling the cutting surface 11 with the magnetic core 10 on the jig is made in the same way. However, since the spring 100 is inserted into the adjustment bolt 51 of the support 50, the fixing plate 60 is always pushed by the spring 100 so as to push the magnetic core 10 to the magnetic core 10. ) Is more reliably prevented.

In addition, adjustment of the center plate 30 in the axial direction is performed by using the rack 122 and the pinion 123 instead of the slider 22. That is, the rack 122 is installed on the upper surface of the base plate 20, and the pinion 123 and the handle 125 which are engaged with the rack 122 are installed on the rotating shaft 124, and the rotating shaft hole is provided on the side of the center plate 30. It is assembled to 30a. Accordingly, when the handle 125 is turned, the rack 122 and the pinion 123 are engaged with each other, and the center plate 30 moves along the axial direction, thereby adjusting the position of the center plate 30.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, modifications, and changes are possible within the scope without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

10 magnetic core 20 base plate
30: center plate 40: side plate
50: support 60: upper and lower fixed plate
100: spring 200: abrasive stone

Claims (10)

A magnetic core polishing jig system for fixing a magnetic core to cut a wound magnetic core along its axial direction and to polish the cut surface thereof.
A base plate forming a horizontal plane;
Upper and lower fixing plates installed on the base plate to be in contact with the upper and lower surfaces of the magnetic core in a direction perpendicular to the axial direction of the magnetic core while the cut surface of the magnetic core is placed upward. ;
A side plate closely attached to a side of the magnetic core and assembled to the base plate such that the cut surface of the magnetic core is horizontal;
A center plate installed on an upper surface of the base plate so as to be in close contact with the upper and lower surfaces of the magnetic cores;
Magnetic core polishing jig comprising a. delete The method of claim 1,
The center plate is fixed by an adjustment bolt fastened through the slot of the slider fixed to the base plate upper surface of the magnetic core polishing jig to adjust the position in the axial direction of the center plate. The method of claim 1,
The pinion gear is fitted to the side surface of the center plate, the rack gear that is engaged with the pinion gear is installed on the upper surface of the base plate jig for adjusting the position of the center plate in the axial direction. The method of claim 1,
The upper and lower fixing plates are supported by being horizontally fitted to a support installed at the rear thereof, and a magnetic core polishing jig in which a head of a bolt screwed to the support is rotatably fitted to be positioned along the axial direction. The method of claim 5,
And a spring provided magnetic core polishing jig provided between the support and the upper and lower fixing plates to provide an elastic force for pushing the support toward the magnetic core. The method according to any one of claims 1, 3, 4, 5, and 6,
Magnetic core polishing jig formed in the upper and lower fixed plate is formed with a pointer of the protruding shape so that the point contact is made in contact with the magnetic core. The method according to any one of claims 1, 3, and 4,
Magnetic core polishing jig is formed in the center plate is a pointer of the protruding shape so that the point contact is made to the portion in contact with the magnetic core. A plurality of magnetic core polishing methods for cutting a wound magnetic core along its axial direction and polishing the cut surface thereof,
Mounting the plurality of magnetic cores on a jig;
Leveling the cut surface of the magnetic core horizontally;
Completely fixing the leveled magnetic core to a jig;
Grinding the cut surface of the magnetic core fixed to the jig with abrasive stone and simultaneously introducing cooling water;
Separating, cleaning and cleaning the magnetic core from the jig;
Magnetic core polishing method comprising a. 10. The method of claim 9,
Magnetic core polishing method of controlling the surface temperature of the magnetic core cutting surface within ± 4 ℃ compared to the temperature before polishing the surface in the step of adding the cooling water while polishing.

Images