Cutter head

Abstract

To improve the processing accuracy on a gear by restraining chattering vibrations during processing of the gear with a cutter head.SOLUTION: A cutter head 1 has a plurality of cutter heads 1 with cutter blades 4 arranged at the same interval as an interval of tooth grooves 3 and given first to Mth numbers in sequence in the circumferential direction of the cutter head 1, where cutter blades with prescribed numbers have been thinned out from the cutter blades 4. There is no common divisor other than 1 in the number N of the tooth grooves 3 and the number M of the cutter blades 4. There are common divisors other than 1 and M in the number M of the cutter blades 4. The prescribed numbers of the cutter blades 4 that are thinned out are numbers with the same remainder when divided by a divisor of the number M of the cutter blades.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a cutter head for skiving a workpiece to form a gear. [Background technology]

[0002] Skiving is one method for forming a gear from a workpiece. In skiving, a cutter head is positioned so that it intersects with the workpiece at a fixed angle. The cutter head has a plurality of cutter blades arranged side by side in the circumferential direction of the cutter head. The cutter blades are arranged at an equal pitch in the circumferential direction of the cutter head (see, for example, Patent Document 1). As the cutter head rotates, the workpiece rotates in synchronization with the rotation of the cutter head, thereby machining the workpiece. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-33732 Summary of the Invention [Problem to be solved by the invention]

[0004] When machining large-diameter or large-module gears using the skiving process described above, chatter vibrations can occur during machining. This can reduce the precision of the gears. One of the causes of chatter vibrations during machining is the cutting resistance of the cutter blades against the workpiece. Therefore, reducing the number of cutter blades that simultaneously come into contact with the workpiece can be considered to reduce the cutting resistance.

[0005] However, reducing the number of cutter blades in the entire cutter head reduces the outer diameter of the cutter head. In this case, the support rigidity of the cutter head decreases, making it difficult to suppress chatter vibration. An object of the present invention is to suppress chatter vibration during gear machining using a cutter head and improve gear machining accuracy. [Means for solving the problem]

[0006] A cutter head according to a first aspect of the present invention is a cutter head for forming a gear having N tooth grooves by skiving. The cutter head according to this aspect includes a plurality of cutter blades, each of which is arranged at the same interval as the spacing between the tooth grooves and numbered sequentially from 1 to M in the circumferential direction of the cutter head, with a predetermined number of cutter blades thinned out. The number of tooth grooves N and the number of cutter blades M have no common divisor other than 1. The number of cutter blades M has divisors other than 1 and M. The predetermined number of the cutter blade to be thinned out is the number that leaves the same remainder when divided by a divisor of the number of cutter blades M.

[0007] A cutter head according to a second aspect of the present invention is a cutter head for forming a gear having N tooth grooves by skiving. The cutter head according to this aspect includes a plurality of cutter blades, which are arranged at intervals equal to the intervals between the tooth grooves and are numbered sequentially from 1 to M in the circumferential direction of the cutter head, with predetermined cutter blades thinned out. The number of tooth grooves N and the number of cutter blades M have no common divisors other than 1. The number of cutter blades M has no divisors other than 1 and M. The predetermined cutter blades to be thinned out are positioned at predetermined intervals in the order in which they enter predetermined tooth grooves among the plurality of tooth grooves.

[0008] A cutter head according to a third aspect of the present invention is a cutter head for forming a gear having N tooth grooves by skiving. The cutter head according to this aspect includes a plurality of cutter blades, each of which is arranged at the same interval as the spacing between the tooth grooves and numbered sequentially from 1 to M in the circumferential direction of the cutter head, with a predetermined number of cutter blades thinned out. The number of tooth grooves N and the number of cutter blades M have a common divisor other than 1. The number of cutter blades M has a divisor other than 1 and M. The predetermined number of the cutter blade to be thinned out is a number that leaves the same remainder when divided by a divisor of the number of cutter blades M.

[0009] A cutter head according to a fourth aspect of the present invention is a cutter head for forming a gear having N tooth grooves by skiving. The cutter head according to this aspect includes a plurality of cutter blades, which are arranged at intervals equal to the spacing between the tooth grooves and are numbered sequentially from 1 to M in the circumferential direction of the cutter head, with predetermined cutter blades thinned out. The number of tooth grooves N and the number of cutter blades M have a common divisor other than 1. The number of cutter blades M has a divisor other than 1 and M. The predetermined cutter blades to be thinned out are positioned at predetermined intervals in the order in which they enter each of the common divisor's number of predetermined tooth grooves among the plurality of tooth grooves. [Effects of the Invention]

[0010] According to the cutter head of the present invention, the cutter blades are arranged in a manner in which a predetermined number of cutter blades are thinned out from a plurality of cutter blades arranged at the same intervals as the tooth grooves. Therefore, the reduction in the outer diameter of the cutter head is suppressed compared to when the number of cutter blades is reduced while maintaining the same spacing between the cutter blades. Furthermore, the reduced number of cutter blades also reduces the number of cutter blades that simultaneously contact the workpiece. This reduces cutting resistance, thereby suppressing chatter vibrations during gear machining. This improves gear machining accuracy. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 2 is a side cross-sectional view showing a cutter head and a workpiece according to the embodiment. [Figure 2] FIG. 2 is a top view showing the cutter head and the workpiece. [Figure 3] FIG. 2 is a top view showing the normal arrangement of cutter blades of the cutter head. [Figure 4] 10 is a table showing a normal arrangement of cutter blades according to a first example of the first embodiment. [Figure 5] 4 is a table showing the arrangement of cutter blades of a cutter head according to a first example of the first embodiment. [Figure 6] 10 is a table showing a normal arrangement of cutter blades according to a second example of the first embodiment. [Figure 7]10 is a table showing the arrangement of cutter blades of a cutter head according to a second example of the first embodiment. [Figure 8] 10 is a table showing a normal arrangement of cutter blades according to examples of the second embodiment. [Figure 9] 10 is a table showing the arrangement of cutter blades of a cutter head according to an example of the second embodiment. [Figure 10] 10 is a table showing normal arrangements of cutter blades according to examples of the third and fourth embodiments. [Figure 11] 10 is a table showing the arrangement of cutter blades of a cutter head according to an example of the third embodiment. [Figure 12] 10 is a table showing the arrangement of cutter blades of a cutter head according to an example of the fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, a cutter head according to an embodiment will be described with reference to the drawings. FIG. 1 is a side cross-sectional view showing a cutter head 1 and a workpiece 2 according to an embodiment. FIG. 2 is a top view showing the cutter head 1 and the workpiece 2 according to an embodiment. The cutter head 1 forms a gear having a plurality of tooth grooves 3 by cutting the workpiece 2 using a skiving process. The cutter head 1 and the workpiece 2 rotate synchronously with each other by a driving device (not shown). As shown in FIG. 1, a rotation axis A1 of the cutter head 1 is inclined with respect to a rotation axis A2 of the workpiece 2.

[0013] As shown in FIG. 2, the cutter head 1 has a plurality of cutter blades 4. The arrangement of the cutter blades 4 of the cutter head 1 is such that a predetermined number of cutter blades 4 are thinned out from the normal arrangement of the cutter blades 4 shown in FIG. 3. In the normal arrangement, the plurality of cutter blades 4 are arranged at the same intervals as the intervals between the plurality of tooth grooves 3 of the workpiece 2. In this embodiment, the arrangement of the cutter blades 4 of the cutter head 1 is determined by thinning out a predetermined number of cutter blades 4 from the normal arrangement in accordance with the number M of cutter blades 4 in the normal arrangement and the number N of tooth grooves 3 of the workpiece 2. The arrangement of the cutter blades 4 of the cutter head 1 according to the first to fourth embodiments will be described below.

[0014] In the following description, as shown in Fig. 3, the normally arranged cutter blades 4 are numbered from 1 to M in order in the circumferential direction of the cutter head 1. In Fig. 3, the number in parentheses next to the symbol attached to each cutter blade 4 indicates the number of each cutter blade 4. For example, 4(2) means the second cutter blade 4.

[0015] 2, the tooth spaces 3 of the workpiece 2 are numbered from 1 to N in the circumferential direction of the workpiece 2. In FIG. 2, the number in parentheses of the symbol assigned to each tooth space 3 indicates the number of each tooth space 3. For example, 3(3) indicates the third tooth space 3.

[0016] (First embodiment) In the first embodiment, the arrangement of the cutter blades 4 of the cutter head 1 is determined according to the following rules (1-1) to (1-3). (1-1) The number N of tooth grooves 3 and the number M of cutter blades 4 have no common divisor other than 1. (1-2) The number M of cutter blades 4 has divisors other than 1 and M. (1-3) The predetermined number of cutter blades 4 to be thinned out is a number that leaves the same remainder when divided by a divisor of the number M of cutter blades 4.

[0017] (First Example of First Embodiment) FIG. 4 is a table showing the relationship between the tooth gaps 3 of the workpiece 2 according to the first example of the first embodiment and the normally arranged cutter blades 4 corresponding to each tooth gap 3. In FIG. 4, column B1 shows the number of the tooth gap 3. Column B2 shows the number of cycles for cutting the tooth gap 3. One cycle means that N tooth gaps 3, from the first to the Nth, are cut. Furthermore, the numbers within the dashed line B3 show the numbers of the normally arranged cutter blades 4 corresponding to each tooth gap 3.

[0018] For example, in the table of Fig. 4, in the first cycle, the first to fourteenth cutter blades 4 correspond to the first to fourteenth tooth spaces 3, respectively. Also, the first to ninth cutter blades 4 correspond to the fifteenth to twenty-third tooth spaces 3, respectively. In other drawings, the numbers of the tooth spaces 3 of the workpiece 2, the number of cycles, and the numbers of the cutter blades 4 are shown in the same arrangement as in Fig. 4.

[0019] As shown in FIG. 4, in the first example of the first embodiment, the number N of tooth spaces 3 is 23. The number M of cutter blades 4 is 14. Therefore, the above-mentioned rules (1-1) and (1-2) are satisfied. When rules (1-1) and (1-2) are satisfied, each tooth space 3 is cut by all M cutter blades 4. For example, as shown in FIG. 4, the first tooth space 3 is cut once by all of the first to fourteenth cutter blades 4 during 14 cycles. Similarly, the second and subsequent tooth spaces 3 are cut once by all of the first to fourteenth cutter blades 4 during 14 cycles.

[0020] Fig. 5 is a table showing the arrangement of the cutter blades 4 of the cutter head 1 according to the first example of the first embodiment. In the table of Fig. 5, the numbers of certain cutter blades 4 have been thinned out from the table of Fig. 4. The numbers of the thinned cutter blades 4 are numbers that leave the same remainder when divided by a divisor of the number M of cutter blades 4.

[0021] In detail, the 2nd, 4th, 6th, 8th, 10th, 12th, and 14th cutter blades 4 have been thinned out. These are numbers that, when the number of cutter blades 4, 14, is divided by the divisor 2, the remainder is 0. Therefore, the cutter head 1 has an arrangement of cutter blades 4 in which the 1st, 3rd, 5th, 7th, 9th, 11th, and 13th cutter blades 4 are arranged, and the 2nd, 4th, 6th, 8th, 10th, 12th, and 14th cutter blades 4 have been thinned out.

[0022] As shown in Fig. 5, each tooth space 3 is cut by all of the cutter blades 4 of the cutter head 1. For example, the first tooth space 3 is cut by all of the first, third, fifth, seventh, ninth, eleventh, and thirteenth cutter blades 4 during 14 cycles. Similarly, the second and subsequent tooth spaces 3 are cut once by all of the first, third, fifth, seventh, ninth, eleventh, and thirteenth cutter blades 4 during 14 cycles.

[0023] Also, for example, in a normal arrangement, the cutter blades 4 are assumed to contact four tooth spaces 3 simultaneously. In the cutter head 1 according to the first example of the first embodiment, the number of cutter blades 4 that simultaneously contact tooth spaces 3 is reduced by thinning out the cutter blades 4 as described above, as shown by the dashed line B4 in FIG. 5. This reduces cutting resistance, thereby suppressing chatter vibrations during gear machining. This improves gear machining accuracy.

[0024] The first, third, fifth, seventh, ninth, eleventh, and thirteenth cutter blades 4 may be thinned out. These are numbers that leave a remainder of 1 when the number of cutter blades 4, 14, is divided by the divisor 2.

[0025] Alternatively, cutter blades 4 having numbers that leave the same remainder when 14, the number of cutter blades 4, is divided by a divisor of 7, may be thinned out. In this case, the 7th and 14th cutter blades 4 may be thinned out. These are numbers that leave a remainder of 0 when 14, the number of cutter blades 4, is divided by a divisor of 7. The 1st and 8th cutter blades 4 may be thinned out. These are numbers that leave a remainder of 1 when 14, the number of cutter blades 4, is divided by a divisor of 7. The 2nd and 9th cutter blades 4 may be thinned out. These are numbers that leave a remainder of 2 when 14, the number of cutter blades 4, is divided by a divisor of 7. The 3rd and 10th cutter blades 4 may be thinned out. These are numbers that leave a remainder of 3 when 14, the number of cutter blades 4, is divided by a divisor of 7. Similarly, cutter blades 4 having numbers that leave a remainder of 4 or greater when 14, the number of cutter blades 4, is divided by a divisor of 7 may be thinned out.

[0026] Alternatively, the combinations of cutter blades 4 with these numbers may be thinned out. As described above, the first example of the first embodiment satisfies (1-3) as described above. In summary, the first example of the first embodiment satisfies rules (1-1), (1-2), and (1-3).

[0027] (Second Example of First Embodiment) FIG. 6 is a table showing the relationship between the tooth grooves 3 of the workpiece 2 according to the second example of the first embodiment and the normally arranged cutter blades 4 corresponding to each tooth groove 3. In the second example of the first embodiment, the number N of tooth grooves 3 is 23. The number M of cutter blades 4 is 15. Therefore, the above-mentioned rules (1-1) and (1-2) are satisfied.

[0028] FIG. 7 is a table showing the arrangement of cutter blades 4 of a cutter head 1 according to a second example of the first embodiment. In the table of FIG. 7, the numbers of certain cutter blades 4 have been thinned out from the table of FIG. 6. The numbers of the thinned cutter blades 4 are numbers that leave the same remainder when divided by a divisor of the number M of cutter blades 4. Therefore, the second example of the first embodiment satisfies the above-mentioned rule (1-3). In summary, the second example of the first embodiment satisfies rules (1-1), (1-2), and (1-3).

[0029] In detail, the 3rd, 6th, 9th, 12th, and 15th cutter blades 4 have been thinned out. These are numbers that, when the number of cutter blades 4, 15, is divided by the divisor 3, the remainder is 0. Therefore, the cutter head 1 has an arrangement of cutter blades 4 in which the 1st, 2nd, 4th, 5th, 7th, 8th, 10th, 11th, 13th, and 14th cutter blades 4 are arranged, and the 3rd, 6th, 9th, 12th, and 15th cutter blades 4 have been thinned out.

[0030] As shown in Fig. 7, each tooth groove 3 is cut by all of the cutter blades 4 of the cutter head 1. For example, the first tooth groove 3 is cut by all of the first, second, fourth, fifth, seventh, eighth, tenth, eleventh, thirteenth, and fourteenth cutter blades 4 during 15 cycles. Similarly, the second and subsequent tooth grooves 3 are cut by all of the first, second, fourth, fifth, seventh, eighth, tenth, eleventh, thirteenth, and fourteenth cutter blades 4 during 15 cycles. Also, as in the first embodiment, by thinning out the cutter blades 4 as described above, the number of cutter blades 4 that simultaneously contact the tooth grooves 3 is reduced.

[0031] (Second embodiment) Next, the arrangement of the cutter blades 4 of the cutter head 1 according to the second embodiment will be described. In the second embodiment, the arrangement of the cutter blades 4 of the cutter head 1 is determined according to the following rules (2-1) to (2-3). (2-1) The number N of tooth grooves 3 and the number M of cutter blades 4 have no common divisor other than 1. (2-2) The number M of cutter blades 4 has no divisors other than 1 and M. (2-3) The predetermined cutter blades 4 to be thinned out are positioned at predetermined intervals in the order of insertion into the predetermined tooth grooves 3 among the plurality of tooth grooves 3.

[0032] (Example of the second embodiment) FIG. 8 is a table showing the relationship between the tooth grooves 3 of the workpiece 2 according to an example of the second embodiment and the normally arranged cutter blades 4 corresponding to each tooth groove 3. In this example of the second embodiment, the number N of tooth grooves 3 is 23. The number M of cutter blades 4 is 13. Therefore, the above-mentioned rules (2-1) and (2-2) are satisfied.

[0033] FIG. 9 is a table showing the arrangement of cutter blades 4 of a cutter head 1 according to an example of the second embodiment. In the table of FIG. 9, the numbers of certain cutter blades 4 have been thinned out from the table of FIG. 8. The thinned cutter blades 4 are positioned at predetermined intervals in the order in which they are inserted into certain tooth grooves 3 among the plurality of tooth grooves 3. Therefore, the example of the second embodiment satisfies the above-mentioned rule (2-3). In summary, the example of the second embodiment satisfies rules (2-1), (2-2), and (2-3).

[0034] In detail, the 8th, 12th, 3rd, and 7th cutter blades 4 have been thinned out. These are the numbers of the cutter blades 4 that are located every third cutter blade 4 in the order of the cutter blades 4 that fit into the first tooth groove 3 (1st, 11th, 8th, 5th, 2nd, 12th, 9th, 6th, 3rd, 13th, 10th, 7th, and 4th). Therefore, the cutter head 1 has an arrangement of cutter blades 4 in which the 1st, 2nd, 4th, 5th, 6th, 9th, 10th, 11th, and 13th cutter blades 4 are arranged, and the 3rd, 7th, 8th, and 12th cutter blades 4 have been thinned out.

[0035] As shown in Fig. 9, each tooth groove 3 is cut by all of the cutter blades 4 of the cutter head 1. For example, the first tooth groove 3 is cut by all of the first, second, fourth, fifth, sixth, ninth, tenth, eleventh, and thirteenth cutter blades 4 during 13 cycles. Similarly, the second and subsequent tooth grooves 3 are cut by all of the first, second, fourth, fifth, sixth, ninth, tenth, eleventh, and thirteenth cutter blades 4 during 13 cycles. Also, as in the first embodiment, by thinning out the cutter blades 4 as described above, the number of cutter blades 4 that simultaneously contact the tooth grooves 3 is reduced.

[0036] The predetermined number is not limited to two, but may be one or more than two.

[0037] (Third embodiment) Next, the arrangement of the cutter blades 4 of the cutter head 1 according to the third embodiment will be described. In the third embodiment, the arrangement of the cutter blades 4 of the cutter head 1 is determined according to the following rules (3-1) to (3-3). (3-1) The number N of tooth grooves 3 and the number M of cutter blades 4 have a common divisor other than 1. (3-2) The number M of cutter blades 4 has divisors other than 1 and M. (3-3) The predetermined number of cutter blades 4 to be thinned out is a number that leaves the same remainder when divided by a divisor of the number M of cutter blades 4.

[0038] (Example of the third embodiment) FIG. 10 is a table showing the relationship between the tooth grooves 3 of the workpiece 2 according to an example of the third embodiment and the normally arranged cutter blades 4 corresponding to each tooth groove 3. In this example of the third embodiment, the number N of tooth grooves 3 is 22. The number M of cutter blades 4 is 14. Therefore, the above-mentioned rules (3-1) and (3-2) are satisfied.

[0039] FIG. 11 is a table showing the arrangement of cutter blades 4 of a cutter head 1 according to an example of the third embodiment. In the table of FIG. 11, the numbers of certain cutter blades 4 are thinned out from the table of FIG. 10. The predetermined numbers of the cutter blades 4 to be thinned out are numbers that leave the same remainder when divided by a divisor of the number M of cutter blades 4. Therefore, the example of the third embodiment satisfies the above-mentioned rule (3-3). In summary, the example of the third embodiment satisfies rules (3-1), (3-2), and (3-3).

[0040] In detail, the 2nd, 4th, 6th, 8th, 10th, 12th, and 14th cutter blades 4 have been thinned out. These are numbers that, when the number of cutter blades 4, 14, is divided by the divisor 2, the remainder is 0. Therefore, the cutter head 1 has an arrangement of cutter blades 4 in which the 1st, 3rd, 5th, 7th, 9th, 11th, and 13th cutter blades 4 are arranged, and the 2nd, 4th, 6th, 8th, 10th, 12th, and 14th cutter blades 4 have been thinned out.

[0041] As shown in FIG. 11 , each odd-numbered tooth gap 3 is cut by all of the cutter blades 4 of the cutter head 1. For example, the first tooth gap 3 is cut by all of the first, third, fifth, seventh, ninth, eleventh, and thirteenth cutter blades 4 during seven cycles. However, the even-numbered tooth gaps 3 are not cut. Therefore, after machining the odd-numbered tooth gaps 3, the cutter head 1 and the workpiece 2 are shifted by one tooth gap 3, and machining is performed again. As a result, the even-numbered tooth gaps 3 are also cut by all of the first, third, fifth, seventh, ninth, eleventh, and thirteenth cutter blades 4 during seven cycles. Furthermore, as in the first embodiment, by thinning out the cutter blades 4 as described above, the number of cutter blades 4 that simultaneously contact the tooth gaps 3 is reduced.

[0042] (Fourth embodiment) Next, the arrangement of the cutter blades 4 of the cutter head 1 according to the fourth embodiment will be described. In the fourth embodiment, the arrangement of the cutter blades 4 of the cutter head 1 is determined according to the following rules (4-1) to (4-3). (4-1) The number N of tooth grooves 3 and the number M of cutter blades 4 have a common divisor other than 1. (4-2) The number M of cutter blades 4 has divisors other than 1 and M. (4-3) The predetermined cutter blades 4 to be thinned out are positioned at predetermined intervals in the order of entering each of the predetermined tooth grooves 3 of a common divisor number among the plurality of tooth grooves 3.

[0043] (Example of the fourth embodiment) Rules (4-1) and (4-2) are the same as the above-mentioned rules (3-1) and (3-2), respectively. Therefore, in the normal arrangement of the example of the fourth embodiment, similar to the example of the third embodiment shown in Figure 10, the number N of tooth grooves 3 is 22. The number M of cutter blades 4 is 14.

[0044] FIG. 12 is a table showing the arrangement of cutter blades 4 of a cutter head 1 according to an example of the fourth embodiment. In the table of FIG. 12, the numbers of certain cutter blades 4 have been thinned out from the table of FIG. 10. The thinned cutter blades 4 are positioned every certain number of adjacent tooth grooves 3 that are a common divisor of the plurality of tooth grooves 3. In this example, since the common divisor is 2, the thinned cutter blades 4 are positioned every third adjacent tooth groove 3 in the order in which they are placed. Therefore, the example of the fourth embodiment satisfies the above-mentioned rule (4-3). In summary, the example of the fourth embodiment satisfies rules (4-1), (4-2), and (4-3).

[0045] Specifically, the ninth, eleventh, thirteenth, second, fourth, and sixth cutter blades 4 have been omitted. These numbers refer to the numbers of the cutter blades 4 that are positioned every other cutter blade in the order of the cutter blades 4 that fit into the first tooth groove 3 (the first, ninth, third, eleventh, fifth, thirteenth, and seventh cutter blades in FIG. 10), and the numbers of the cutter blades 4 that are positioned every other cutter blade in the order of the cutter blades 4 that fit into the second tooth groove 3 (the second, tenth, fourth, twelve, sixth, fourteenth, and eighth cutter blades in FIG. 10). Therefore, the cutter head 1 has an arrangement of cutter blades 4 in which the first, third, fifth, seventh, eighth, tenth, twelfth, and fourteenth cutter blades 4 are arranged, and the second, fourth, sixth, ninth, eleventh, and thirteenth cutter blades 4 have been omitted. Strictly speaking, according to rule (4-3), the eighth cutter blade is also omitted. However, in this embodiment, the common divisor is 2, so the mth (e.g., first) and (m+1)th (e.g., second) tooth spaces 3 are independent. It is desirable that the machining conditions for the two independent tooth spaces 3 are the same. Therefore, in this embodiment, in order to make the number of blades in the two tooth spaces 3 the same, the cutter head 1 has an arrangement that includes an eighth cutter blade 4. However, the eighth cutter blade may also be thinned out.

[0046] In the example of the fourth embodiment, as shown in FIG. 12, similarly to the first embodiment, the number of cutter blades 4 that simultaneously contact the tooth grooves 3 is reduced by thinning out the cutter blades 4 as described above.

[0047] According to the cutter head 1 according to the present embodiment described above, the cutter blades 4 are arranged in such a manner that a predetermined number of cutter blades 4 are thinned out from a plurality of cutter blades 4 arranged at the same intervals as the tooth grooves 3. Therefore, the reduction in the outer diameter of the cutter head 1 is suppressed compared to when the number of cutter blades 4 is reduced while maintaining the spacing between the cutter blades 4. Furthermore, by reducing the number of cutter blades 4, the number of cutter blades 4 that simultaneously come into contact with the workpiece 2 is also reduced. This reduces cutting resistance, thereby suppressing chatter vibrations during gear machining. This improves gear machining accuracy.

[0048] Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications are possible without departing from the gist of the invention.

[0049] In the above embodiment, the cutter head 1 processes the workpiece 2 into an internal gear. However, the cutter head 1 may also process the workpiece 2 into an external gear. [Industrial Applicability]

[0050] According to the present invention, chatter vibrations occurring when a gear is machined by a cutter head are suppressed, and the machining accuracy of the gear is improved. [Explanation of symbols]

[0051] 1: Cutter head, 3: Tooth groove, 4: Cutter blade

Claims

1. A manufacturing method for forming a gear having N tooth grooves by skiving using a cutter head, The cutter head includes a plurality of cutter blades, at least some of which are arranged at unequal intervals by thinning out cutter blades with predetermined numbers from among the cutter blades which are assumed to be arranged at the same intervals as the intervals between the tooth grooves and numbered sequentially from 1st to Mth in the circumferential direction of the cutter head, The number N of tooth grooves and the number M of cutter blades have no common divisor other than 1, The number M of cutter blades has a divisor other than 1 and M, The predetermined number of the cutter blades to be thinned out is a number that leaves the same remainder when divided by a divisor of the number M of the cutter blades, forming a gear having the N tooth grooves by cutting a workpiece with the cutter head. Manufacturing method.

2. A manufacturing method for forming a gear having N tooth grooves by skiving using a cutter head, the cutter head includes a plurality of cutter blades, which are assumed to be arranged at the same intervals as the intervals between the tooth grooves and numbered sequentially from 1st to Mth in the circumferential direction of the cutter head, with predetermined cutter blades thinned out; The number N of tooth grooves and the number M of cutter blades have no common divisor other than 1, The number M of cutter blades has no divisors other than 1 and M, the predetermined cutter blades to be thinned out are positioned at intervals of a predetermined number in the order in which they enter predetermined tooth grooves among the tooth grooves, forming a gear having the N tooth grooves by cutting a workpiece with the cutter head. Manufacturing method.

3. A manufacturing method for forming a gear having N tooth grooves by skiving using a cutter head, the cutter head includes a plurality of cutter blades, at least some of which are arranged at unequal intervals by thinning out predetermined cutter blades from among cutter blades which are assumed to be arranged at the same intervals as the tooth grooves and numbered sequentially from 1st to Mth in the circumferential direction of the cutter head, the number N of tooth grooves and the number M of cutter blades have a common divisor other than 1, The number M of cutter blades has a divisor other than 1 and M, the predetermined cutter blades to be thinned out are positioned at predetermined intervals in the order of entering the predetermined tooth grooves of the common divisor number among the tooth grooves, forming a gear having the N tooth grooves by cutting a workpiece with the cutter head. Manufacturing method.

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