WO2008108537A1

WO2008108537A1 - Bracket process of manufacture for orthodontics

Info

Publication number: WO2008108537A1
Application number: PCT/KR2008/000447
Authority: WO
Inventors: Jeng-Soo Choi
Original assignee: Jeng-Soo Choi
Priority date: 2007-03-06
Filing date: 2008-01-24
Publication date: 2008-09-12
Also published as: KR100741460B1

Abstract

A method for manufacturing a bracket for orthodontics is disclosed, in which it is easy to manufacture a hook, and a rubber ring engaged to an engaging groove of a hook is stably engaged to teeth while not separating from the same.

Description

BRACKET PROCESS OF MANUFACTURE FOR ORTHODONTICS

Technical Field

[1] The present invention relates to a method for manufacturing a bracket for orthodontics, and in particular to a method for manufacturing a bracket for orthodontics in which it is easy to manufacture a hook, and a rubber ring engaged to an engaging groove of a hook is stably engaged to teeth while not separating from the same.

[2]

Background Art

[3] Orthodontics is a work for correcting non-matched teeth. Orthodontics also includes a therapy for an abnormal surrounding tissue of a tooth, which may worsen a tooth arrangement, and a correction for entire teeth or a mismatch of teeth or a mismatch between upper and lower jaws.

[4] As shown in Figure 1, an orthodontic apparatus used for orthodontics includes a bracket 2 attached to a tooth 1, and a wire 7 inserted into an outer side of the bracket 2 for connecting the bracket 2.

[5] The mismatching tooth correction method using the above orthodontic apparatus is as follows. First of all, an adhesive is coated on a certain surface of the tooth 1 to be corrected. When an adhesive is semi-solidified after a certain time, the bracket 2 is attached.

[6] The position of the bracket 2 is adjusted for an easier insertion of the wire 7. It needs to wait until the semi- solidified adhesive is fully solidified. When the adhesive is fully solidified, the wire 7 is inserted into the slots 3 of the brackets 2 attached to the teeth 1. A rubber 8 is inserted into the side grooves 2a of the bracket so that the wire 7 is not separated from the slots 3 of the bracket 2.

[7] A wing 4 longer than other wings 4 is formed on a side surface of the bracket 2. The wing 4 is provided with an engaging groove 5 in which the rubber ring 9 is inserted. The longer wing 4 having the engaging groove 5 is called a hook 6.

[8] The hook 6 is formed on one side surface of the bracket 2 for the reason that it needs a certain space between the neighboring teeth 1 by pulling the same. The brackets 2 are attached to the neighboring teeth 1 in such a manner that the engaging grooves 5 of the hooks 6 are oriented opposite to each other. Two hooks 6 remain being pulled from each other by inserting the rubber ring 9 into the engaging grooves 5 of two hooks 6.

[9] Figures 2 through 6 are schematic plane views illustrating a state that the hook 6 is being processed in the bracket 2. When a bracket 2 having the wing 4 of Figure 2 is prepared, a drilling work D is performed between the wings 4 in a direction from the up portion to the down portion as shown in Figure 3, so that the engaging grooves 5 are formed at both sides of each wing 4 as shown in Figure 4.

[10] When the engaging grooves 5 are formed on the inner surfaces of the wings 4, as shown in Figure 5, one wing 4 among a plurality of wings 4 is cut, so that one wing 4 having the engaging groove 5 is formed, namely, the hook 6 is formed. When the hook 6 is formed, as shown in Figure 6, the corners of the bracket 2 are polished through a polishing work.

[11] However, the above conventional bracket manufacturing method has some problems.

[12] When the hook 6 having the engaging groove 5 is formed, a drilling work D is performed between the wings 4, and the engaging groove 5 is formed on the inner surfaces of the wings 4. One wing 4 among a plurality of wings 4 is cut using a cutter(not shown). Since the hook 6 of the bracket is manufactured through a drilling work and cutting work in the conventional art, two different tools and two different work processes are separately needed. So, the conventional bracket manufacturing method is complicated, and the work time is so delayed.

[13] As another problem of the conventional art, since the engaging groove 5 formed in the hook 6 does not have a substantial depth, when the corners of both sides of the engaging groove 5 are polished, the rubber ring(not shown) supported in the engaging groove 5 may be separated from the same.

[14] The engaging groove 5 formed in the conventional bracket 2 is formed by means of a drilling work D. So, since the engaging groove 5 has a small arc corresponding to part of the diameter of the drill D, it has a shallow depth and wide width. When the bracket 2 having the engaging groove 5 is polished, the corners of both sides of the engaging groove 5 are polished, and the boundary of the engaging groove 5 are damaged, so that the rubber ring mounted in the engaging groove 5 is easily separated.

[15] When the engaging groove 5 is formed deeper, it is needed to use a drill D having a larger diameter. When the engaging groove 5 is formed with a large diameter drill D, the depth of the engaging groove 5 may increase, but the width of the engaging groove 5 increases as well. So, the rubber is not tightly supported in the engaging groove 5.

[16]

Disclosure of Invention Technical Problem

[17] Accordingly, it is an object of the present invention to provide a method for manufacturing a bracket for orthodontics in which a hook of a bracket can be more easily manufactured.

[18] It is another object of the present invention to provide a method for manufacturing a bracket for orthodontics in which a rubber ring can be stably supported in an engaging groove. [19]

Technical Solution

[20] To achieve the above objects, there is provided a method for manufacturing a bracket for orthodontics which comprises a plate cutting step in which a rectangular raw material is cut into a plurality of longitudinal bars having a length longer than a width; a slot formation step in which a slot is formed on a center of one side of the cut bar in a longitudinal direction; a side groove formation step in which a first side groove and a second side groove are formed at a center of both sides of the bar so that the both sides of the bar are divided into an upper wing formed of a first wing and a second wing and a base of a lower side; a base cutting step in which an end of the base of one side in the base of the bar is cut; a cutting-out step in which a longitudinal bar is cut-out depending the size of the bracket for manufacturing a long bar; a wing divide groove formation step in which the first and second wings are divided for thereby manufacturing a pair of first wings and a pair of second wings, respectively, and a wing divide groove being orthogonal to the slot is formed on a center of one side of the cutout bracket; a bracket fixing step in which the bracket having a wing divide groove is set in a vise; a first wing cutting step in which the cutter is moved toward the first wing of the set bracket and cuts only one first wing between a pair of first wings; and an engaging groove formation step in which the cutter is moved toward the non-cut first wing between a pair of the first wings and manufactures an engaging groove in the non-cut first wing.

[21] In the first wing cutting step and the engaging groove formation step, the cutter moves toward a pair of the first wings and cuts one first wing between a pair of the first wings, and then forms an engaging groove on one side of the non-cut first wing.

[22] In the first wing cutting step, the cutting length of the first wing is 1.4mm~ 1.6mm.

[23] In the engaging groove formation step, the depth of the engaging groove is

0.2mm~ 1.5mm.

[24] In the engaging groove formation step, the width of the engaging groove is

0.3mm~ 1.5mm.

[25] In the engaging groove formation step, the revolution of the cutter is

5000rpm~16000rpm.

[26] In the engaging groove formation step, the cross section of the end of the cutter is a semicircular shape.

[27] A cutter cuts a first wing between a pair of first wings and then forms an engaging groove on a side surface of the non-cut other one, so that it is possible to concurrently perform a first wing cutting work and an engaging groove forming work with one work by operating the cutter. So, the hook forming process of the bracket is decreased, and the productivity is enhanced.

[28] Since the engaging groove is formed as the cutter, which cut the first wing between a pair of the wings already, keeps moving toward the non-cut first wing, it is possible to form an engaging groove with an enough depth on the first wing by properly adjusting the forwarding distance of the cutter. So, even when the corners of the engaging groove are polished during the polishing and shining works, since the rubber ring is inserted in the engaging groove with a substantial depth, it can be stably supported in the engaging groove while not separating from the same.

[29]

Advantageous Effects

[30] In the present invention, a hook of a bracket can be more easily manufactured. A rubber ring can be stably supported in an engaging groove. [31]

Brief Description of the Drawings

[32] The present invention will become better understood with reference to the accompanying drawings which are given only by way of illustration and thus are not limitative of the present invention, wherein;

[33] Figure 1 is a schematic perspective view illustrating a conventional bracket for orthodontics;

[34] Figures 2 through 6 are schematic plane views illustrating a conventional method for manufacturing a bracket for orthodontics;

[35] Figure 7 is a schematic perspective view illustrating a state that a bar is manufactured by cutting a raw material;

[36] Figure 8 is a schematic perspective view illustrating a state that a slot is formed in a bar;

[37] Figures 9 and 10 are schematic perspective views illustrating a state that a side groove is formed at both sides of a bar;

[38] Figure 11 is a schematic perspective view illustrating a state that part of a base is cut;

[39] Figure 12 is a schematic perspective view illustrating a bar is cut with a certain size depending on the size of a bracket to be manufactured;

[40] Figure 13 is a schematic perspective view illustrating a state that a wing divide groove is formed on one surface of a cut bracket;

[41] Figure 14 is a schematic perspective view illustrating a state that one end of a wing of a bracket is cut;

[42] Figure 15 is a schematic perspective view illustrating a state that an engaging groove is formed on the other end of a wing;

[43] Figures 16 through 18 are schematic plane views illustrating a state that a first wing cutting step and an engaging groove processing step are sequentially performed;

[44] Figure 19 is a schematic perspective view illustrating a finished product after a polishing and shining work are completed; and

[45] Figure 20 is a flow chart of a method for manufacturing a bracket for orthodontics according to the present invention.

[46]

Best Mode for Carrying Out the Invention

[47] In the present invention, the method for manufacturing a bracket for orthodontics comprises a plate cutting step SlO in which a rectangular raw material 11 is cut into a plurality of longitudinal bars 12 having a length longer than a width; a slot formation step S20 in which a slot 13 is formed on a center of one side of the cut bar 12 in a longitudinal direction; a side groove formation step S30 in which a first side groove 14 and a second side groove 15 are formed at a center of both sides of the bar 12 so that the both sides of the bar 12 are divided into an upper wing formed of a first wing 16 and a second wing 17 and a base 18 of a lower side; a base cutting step S40 in which an end of the base 18 of one side in the base 18 of the bar 12 is cut; a cutting-out step S50 in which a longitudinal bar 12 is cut-out depending the size of the bracket 20 for manufacturing a long bar 12; a wing divide groove formation step S60 in which the first and second wings 16 and 17 are divided for thereby manufacturing a pair of first wings 16 and a pair of second wings 17, respectively, and a wing divide groove 19 being orthogonal to the slot 13 is formed on a center of one side of the cut-out bracket 20; a bracket fixing step S70 in which the bracket 20 having a wing divide groove 19 is set in a vise; a first wing cutting step S80 in which the cutter 23 is moved toward the first wing 16 of the set bracket 20 and cuts only one first wing 16 between a pair of first wings 16; and an engaging groove formation step S90 in which the cutter 23 is moved toward the non-cut first wing 16 between a pair of the first wings 16 and manufactures an engaging groove 21 in the non-cut first wing 16.

[48]

Mode for the Invention

[49] The features and advantages of the present invention will be well understood with the accompanying drawings and descriptions of the same.

[50] As shown in Figure 19, the bracket for orthodontics manufactured in the method of the present invention comprises a slot 13 formed on an upper center of the bracket 20, first and second side grooves 14 and 15 formed at both sides of the bracket 20, a base 18 formed on a lower side of the bracket 20 with the helps of the first and second side grooves 14 and 15, first and second wings 16 and 17 formed at both upper sides of the bracket 20 with the helps of the first and second side grooves 14 and 15, a wing divide groove 19 which is formed on an upper center of the bracket 20 while being orthogonal to the slot 13 for thereby dividing the first and second wings 16 and 17 in one pair, and a hook 22 formed of the first wing 16 and an engaging groove 21.

[51] Here, the slot 13 is inclined inwards from the upper side of the bracket 20 with an inclination angle of 2-11°. The first side groove 14 formed at one side in the side grooves formed at both sides of the bracket 20 is parallel with a horizontal line. The angle of the first side groove 14 keeps 0 ° with respect to the horizontal line.

[52] The second side groove 15 formed in the other side of the bracket 20 is inclined upwards from the side of the bracket 20 to its inner side with an inclination angle of 10 0 in an upward direction with respect to the horizontal like.

[53] The rubber ring(not shown) is engaged at the first and second side grooves 14 and

15, and the wire(not shown) inserted into the slot 13 is inwardly supported in the slot 13 with the help of the rubber ring. The second side groove 15 is inclined at an angle of 10° for the reason that it should be easily separated when one side of the rubber ring is engaged thereto. When the angle of the second side groove 15 is larger than 10°, the escape of the rubber ring can be prevented, but in this case it is hard to form the second side groove 15, and the second wing 17 of the upper side of the second side groove 15 may be easily damaged.

[54] The base 18 is used for attaching the bracket 20 to a surface of the tooth. Namely, an adhesive is coated on the lower surface of the base 18, and it is attached to the surface of the tooth.

[55] The wing divide groove 19 divides the first and second wings 16 and 17, respectively, so that a pair of first wings 16 and a pair of second wings 17 are orthogonal to the slot 13 at a center of the bracket 20, respectively. So, the first and second wings 16 and 17 are provided in pairs, respectively, with the help of the wing divide groove 19. One first wing 16 between a pair of the first wings 16 is cut, and an engaging groove 21 is formed in the non-cut other one.

[56] A hook 22 is formed in the non-cut first wing 16 for engaging a rubber by forming the engaging groove 21 using the cutter 23.

[57] Namely, the hook 22 is formed in the non-cut first wing 16 for engaging the rubber ring by forming an engaging groove 21 using the cutter 23.

[58] The thickness of the cutter 23 for forming the engaging groove 21 is preferably

0.3mm~ 1.5mm. When the thickness of the cutter 23 is below 0.3mm, the rubber ring cannot be properly inserted into the engaging groove 21. When the thickness of the cutter 23 is above 1.5mm, since a relatively wider area of engaging groove 21 is formed, the working time for the engaging groove 21 increases, and the rubber ring may not be tightly engaged by means of the wider engaging groove 21.

[59] The engaging groove 21 is formed as follows. Namely, the cutter 23 moves toward a pair of the first wings 16, and cuts one first wing 16 between a pair of the first wings 16 and keeps moving and then forms an engaging groove 21 at one side of the remaining first wing 16 which is not cut.

[60] So, the cutting work of the first wing 16 and the work for forming the engaging groove 21 can be concurrently performed with one work of the cutter 23. Therefore, the manufacture of the hook 22 of the bracket 20 is decreased, and the productivity is enhanced.

[61] The depth of the engaging groove 21 is preferably 0.2mm~ 1.5mm. When the depth of the engaging groove 21 is below 0.2mm, the rubber ring cannot be substantially inserted into the engaging groove 21. In particular, during the polishing and shining works after forming the hook 22, the rubber ring inserted in the shallow engaging groove 21 may be easily separated while the corners of the opening of the engaging groove 21 is being polished. When the depth of the engaging groove 21 is above 1.5mm, the rubber ring is surely inserted, but the hook 22 of the engaging groove 21 may be easily damaged, and the upper side of the hook 22 may be easily broken.

[62] The method for manufacturing a bracket for orthodontics of the present invention comprises a plate cutting step SlO in which a rectangular raw material 11 is cut into a plurality of longitudinal bars 12 having a length longer than a width; a slot formation step S20 in which a slot 13 is formed on a center of one side of the cut bar 12 in a longitudinal direction; a side groove formation step S30 in which a first side groove 14 and a second side groove 15 are formed at a center of both sides of the bar 12 so that the both sides of the bar 12 are divided into an upper wing formed of a first wing 16 and a second wing 17 and a base 18 of a lower side; a base cutting step S40 in which an end of the base 18 of one side in the base 18 of the bar 12 is cut; a cutting-out step S50 in which a longitudinal bar 12 is cut-out depending the size of the bracket 20 for manufacturing a long bar 12; a wing divide groove formation step S60 in which the first and second wings 16 and 17 are divided for thereby manufacturing a pair of first wings 16 and a pair of second wings 17, respectively, and a wing divide groove 19 being orthogonal to the slot 13 is formed on a center of one side of the cut-out bracket 20; a bracket fixing step S70 in which the bracket 20 having a wing divide groove 19 is set in a vise; a first wing cutting step S80 in which the cutter 23 is moved toward the first wing 16 of the set bracket 20 and cuts only one first wing 16 between a pair of first wings 16; and an engaging groove formation step S90 in which the cutter 23 is moved toward the non-cut first wing 16 between a pair of the first wings 16 and manufactures an engaging groove 21 in the non-cut first wing 16.

[63] As shown in Figures 7 and 20, in a plate cutting step SlO, a rectangular raw material 11 is cut into longitudinal bars 12 having a longer length than a width. In this step, as shown in Figure 7, the wide raw material 11 is cut into bars 12 depending on the width of the bracket 20.

[64] As shown in Figures 8 and 20, when the bars 12 are made, a slot formation step S20 is performed for forming a slot 13 at a center of the bar 12 in a longitudinal direction. The slot 13 is formed at a plane center of the bar 12 in a longitudinal direction. Here, the slot 13 is inclined in an inward direction from the plane side of the bar 12, and the inclination angle of the slot 13 is 2-11°. A wire 7 is engaged to the slot 13 for orthodontics. As the wire 7 is tightened depending the orthodontic level, the wire is pushed inwards for thereby pressurizing the bracket 20, so that the orthodontics is performed.

[65] As shown in Figures 9, 10 and 20, when the slot 13 is formed in the bar 12, in a side groove formation step S30, first and second side grooves 14 and 15 are formed at both center portions of the bar 12 so that the both sides of the bar 12 become an upper wing and a base 18 of a lower side formed of the first and second wings 16 and 17.

[66] The first side groove 14 of one side of the side grooves is parallel with respect to the horizontal line, and the formation angle of the first side groove 14 is 0° with respect to the horizontal line.

[67] As shown in Figure 10, the second side groove 15 is formed at the other one of the both sides of the bar 12. Here, the second side groove 15 is inclined in an upward direction from the side of the bar 12 to the inner side. It has an inclination angle of 10° in an upward direction with respect to the horizontal line.

[68] The rubber ring is engaged to the first and second side grooves 14 and 15, respectively, and the wire inserted in the slot 13 is inwardly supported by means of the engaged rubber ring. Here, the second side groove 15 is inclined at about 10° for the reasons that one side of the rubber ring is not easily escaped when it is engaged.

[69] When the angle of the second side groove 15 is larger than 10°, the escape of the rubber ring can be prevented, but forming the second side groove 15 is hard, and the second wing 17 of the upper side of the second side groove 15 may be easily damaged.

[70] The base 18 is provided at a lower side with the helps of the first and second side grooves 14 and 15 formed at both sides of the bar 12, and the first and second wings 16 and 17 are provided at both upper sides.

[71] As shown in Figures 11 and 20, when the first and second side grooves 14 and 15 are formed at both sides of the bar 12, the end of the base 18 of one side of the base 18 of the bar 12 is cut in a base cutting step S40. In this base cutting step S40, since the base 18 of one side is cut, the slot 13 is positioned at the center of the bar 12.

[72] Once one end of the base 18 is cut, as shown in Figures 12 and 20, the longitudinal bar 12 is cut depending on the size of the bracket 20 to be manufactured in a cutting- out step S50. In the cutting-out step S50, the front and rear width of the bracket 20 is adjusted depending on the size of the bracket 20 to be manufactured.

[73] When the bracket 20 is cut depending on the size, as shown in Figures 13 and 20, the first and second wings 16 and 17 are divided, respectively, for thereby manufacturing a pair of first wings 16 and a pair of second wings 17, and a wing divide groove 19 orthogonal to the slot 13 is formed at the center of one side of the cut-out bracket 20 in a wing divide groove formation step S60.

[74] The wing divide groove 19 is formed on a center of the upper surface of the bracket

20 and forms a cross shape groove along with the slot 13. The first and second wings 16 and 17 are provided in pairs, respectively, with the help of the wing divide groove 19. One first wing 16 between a pair of the first wings 16 is cut, and an engaging groove 21 is formed in the non-cut first wing 16.

[75] When the wing divide groove 19 is formed in the bracket 20, as shown in Figure 20, the bracket 20 with the wing divide groove 19 is set in a vise(not shown) in a bracket fixing step S70.

[76] Here, the bracket 20 is fixed, so that in a state that the bracket 20 is fixed in the vise, one first wing 16 between a pair of the first wings 16 is cut, and the engaging groove

21 is formed in the non-cut first wing 16 for thereby finally manufacturing the hook 22. Here, the bracket 20 fixed in the vise is set so that the cutter 23 works in an optimum state for the above-described operations.

[77] As shown in Figures 14, 15 and 20, when the wing divide groove 19 is formed in the bracket 20, the cutter 23 is moved toward the first wing 16 of the set bracket 20, and only one first wing 16 between a pair of the first wings 16 is cut in a first wing cutting step S 80.

[78] The thickness of the cutter 23 used in the first wing cutting step S80 is preferably

0.3mm~ 1.5mm.

[79] When the thickness of the cutter 23 is below 0.3mm, the rubber ring is not properly inserted into the engaging groove 21. When the thickness of the cutter 23 is above 1.5mm, since a relatively wider area of the engaging groove 21 is processed, the processing time of the engaging groove 21 is extended. In addition, the rubber ring may not be tightly supported by means of the wider engaging groove 21.

[80] The cutting length of the first wing 16 to be cut by the cutter 23 is preferably

1.4mm~ 1.6mm.

[81] When the cutting length of the first wing 16 is below 1.4mm, it is impossible to manufacture the engaging groove 21 in the non-cut first wing 16. When the cutting length of the first wing 16 is above 1.6mm, since the cutting portion partially overlaps the first side groove 14, the length of the first side groove 14 decreases as deep as the overlapped depth. As a result, the rubber ring is not properly engaged to the first side groove 14.

[82] When one first wing 16 between a pair of the first wings 16 is cut, as shown in

Figures 15 through 20, the cutter 23 is moved toward the non-cut first wing 16, and the engaging groove 21 is formed in the non-cut first wing 16 in an engaging groove formation step S90.

[83] In the engaging groove formation step S90, the cutter 23 moves toward a pair of the first wings 16 and cuts one first wing 16 between a pair of the first wings 16 and keeps moving and forms the engaging groove 21 in one side of the non-cut first wing 16.

[84] So, the first wing cutting work and engaging groove formation work are concurrently performed with one work that the cutter 23 is moved. The manufacturing process of the hook 22 of the bracket 20 decreases, and the productivity is enhanced.

[85] The depth of the engaging groove 21 is preferably 0.2mm~1.5mm.

[86] When the depth of the engaging groove 21 is below 0.2mm, the rubber ring is not substantially inserted into the engaging groove 21. Since the corners of the opening of the engaging groove 21 may be polished during the polishing and shining works after the hook 22 is processed, the rubber ring may be easily separated from the shallow engaging groove 21. When the depth of the engaging groove 21 is above 1.5mm, the rubber ring may be surely inserted, but the hook 22 of the engaging groove 21 may be weakened, so that the upper end of the hook 22 may be easily broken.

[87] The width of the engaging groove 21 is preferably 0.3mm~ 1.5mm.

[88] When the thickness of the engaging groove 21 is below 0.3mm, the rubber ring may not be properly inserted into the engaging groove 21. When the thickness of the engaging groove 21 is above 1.5mm, since a relatively wider area of the engaging groove 21 is processed by means of the cutter 23, the processing time of the engaging groove 21 increases, and the rubber ring may be not tightly supported by means of the wider engaging groove 21.

[89] In the engaging groove formation step S90, the revolution of the cutter 23 is preferably 5000rpm~16000rpm.

[90] When the revolution of the cutter 23 is below 5000rpm, the processing speed of the engaging groove 21 is decreased, and the surrounding portions of the engaging groove 21 may not be smooth. When the revolution of the cutter 23 is above 16000rpm, the processing speed of the engaging groove 21 is increased, and the roughness of the processed surface of the engaging groove 21 is poor, and the consumption of electric power increases.

[91] In the engaging groove formation step S90, the cross section of the end of the cutter

23 may be a channel shape or a semicircular shape. In case that the cross section of the end of the cutter 23 is formed in a semicircular shape, the rubber ring having a semicircular cross section is closely contacted with the inner side of the semicircular engaging groove 21. So, since the contact area between the rubber ring and the engaging groove 21 increases, a friction resistance between the same is maximized, so that the rubber ring is more stably supported in the engaging groove 21 of the hook 22.

[92] In the engaging groove formation step of the present invention, the cutter 23, which has cut one first wing 16 between a pair of the first wings 16, keeps moving toward the non-cut first wing 16 and manufactures an engaging groove, so that it is possible to form an engaging groove 21 having a substantial depth at the first wing 16 by adjusting the moving distance of the cutter 23. As shown in Figure 19, even when the corners of the engaging groove 21 are polished after the polishing and shining works, since the rubber ring is stably inserted into the substantially deep engaging groove 21, it can not be easily separated from the same.

[93] In the first wing cutting step S80 and the engaging groove formation step S90, the cutter 23 moves toward a pair of the first wings 16 and cuts one first wing 16 between a pair of the first wings 16 and keeps moving and forms an engaging groove 21 at one side of the non-cut first wing 16. In another embodiments of the present invention, the engaging groove formation step S90 may be performed after the cutter 23 moves forward and stops after finishing the first wing cutting step S 80.

[94] In the above operation, it is possible to check the overall states of the cuter 23 before the engaging groove formation step S90 while the cutter 23 moves backward and stops. At this time, it is possible to properly cope with the general actions such as a cutter exchange, a reassembling, a foreign substance removal or something.

[95]

Industrial Applicability

[96] As described above, since the first wing cutting work and engaging groove formation work can be concurrently performed with one time work that the cutter moves. So, the manufacturing process of the hook of the bracket is shortened, and the productivity is enhanced. Since it is possible to form an engaging groove having a substantial depth in the first wing by properly adjusting the moving distance of the cutter. Even when the corners of the engaging groove are polished during the polishing and shining works, the rubber ring can be stably supported in the engaging groove with a substantial depth.

[97]

Sequence Listing

[98] orthodontics, polishing, wire, bar

Claims

[1] A method for manufacturing a bracket for orthodontics, comprising: a plate cutting step SlO in which a rectangular raw material 11 is cut into a plurality of longitudinal bars 12 having a length longer than a width; a slot formation step S20 in which a slot 13 is formed on a center of one side of the cut bar 12 in a longitudinal direction; a side groove formation step S30 in which a first side groove 14 and a second side groove 15 are formed at a center of both sides of the bar 12 so that the both sides of the bar 12 are divided into an upper wing formed of a first wing 16 and a second wing 17 and a base 18 of a lower side; a base cutting step S40 in which an end of the base 18 of one side in the base 18 of the bar 12 is cut; a cutting-out step S50 in which a longitudinal bar 12 is cut-out depending the size of the bracket 20 for manufacturing a long bar 12; a wing divide groove formation step S60 in which the first and second wings 16 and 17 are divided for thereby manufacturing a pair of first wings 16 and a pair of second wings 17, respectively, and a wing divide groove 19 being orthogonal to the slot 13 is formed on a center of one side of the cut-out bracket 20; a bracket fixing step S70 in which the bracket 20 having a wing divide groove 19 is set in a vise; a first wing cutting step S 80 in which the cutter 23 is moved toward the first wing 16 of the set bracket 20 and cuts only one first wing 16 between a pair of first wings 16; and an engaging groove formation step S90 in which the cutter 23 is moved toward the non-cut first wing 16 between a pair of the first wings 16 and manufactures an engaging groove 21 in the non-cut first wing 16.

[2] The method of claim 1, wherein in said first wing cutting step S80 and said engaging groove formation step S90, the cutter 23 moves toward a pair of the first wings 16 and cuts one first wing 16 between a pair of the first wings 16, and then forms an engaging groove 21 on one side of the non-cut first wing 16.

[3] The method of claim 1, wherein in said first wing cutting step S80 and said engaging groove formation step S90, the cutter 23 moves toward a pair of the first wings 16 and cuts one first wing between a pair of the first wings 16, and the first wing cutting step S 80 is finished, and then the cutter 23 moves backwards and stops, and then moves forward and forms an engaging groove 21 on one side of the non-cut first wing 16 in the engaging groove formation step S90. [4] The method of either claim 1 or claim 2, wherein in said first wing cutting step

S80, the cutting length of the first wing 16 is 1.4mm~ 1.6mm. [5] The method of either claim 1 or claim 2, wherein in said engaging groove formation step S90, the depth of the engaging groove 21 is 0.2mm~1.5mm. [6] The method of either claim 1 or claim 2, wherein in said engaging groove formation step S90, the width of the engaging groove 21 is 0.3mm~ 1.5mm. [7] The method of either claim 1 or claim 2, wherein in said engaging groove formation step S90, the revolution of the cutter 23 is 5000rpm~16000rpm. [8] The method of either claim 1 or claim 2, wherein in said engaging groove formation step S90, the cross section of the end of the cutter 23 is a semicircular shape. [9] The method of either claim 1 or claim 2, wherein in said engaging groove formation step S90, the cross section of the end of the cutter 23 is a channel shape.