JP4371191B2 - Rolled flat dies - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in teeth of a rolled flat die.
[0002]
[Prior art]
Conventionally, a rolling flat die 11 used for involute spline processing is shown in FIG. 2, in which a workpiece bites into the biting tooth portion 12 where the workpiece bites and the tooth height gradually increases, and a workpiece bitten by the biting tooth portion. An adjustment tooth part 13 whose tooth height gradually increases so as to gradually shape the teeth, a finishing tooth part 14 having a substantially constant tooth height, and a relief tooth part 15 that allows the workpiece to escape more easily than a die. Sequentially in the longitudinal direction. The adjustment tooth part 13 may be called a second biting tooth part. The lengths of the biting tooth portion 12, the adjustment tooth portion 13, and the finishing tooth portion 14 are set to be at least equivalent to one rotation of the workpiece. Further, the biting tooth portion and the adjustment tooth portion may be collectively referred to as a biting tooth portion.
[0003]
The biting tooth portion 12 of the conventional rolled flat die is subjected to sandblasting to prevent the flat die 11 and the workpiece from slipping. The adjustment tooth portion 13, the finish tooth portion 14, and the relief tooth portion 15 are not subjected to sand blasting because the workpiece and the flat die teeth 13a, 14a are engaged with each other, and no slip occurs. The tooth tip shape of the tooth 12a of the biting tooth portion 12 is the round radius of the involute spline root where the round radius R12 of the corner 12b on the coast side (when viewed from the biting tooth portion side) is processed. The tooth tip shapes of the teeth 13a and 14a of the adjustment tooth portion 13 and the finish tooth portion 14 are rounded radii R6 at the base of the involute spline in which the round radii R13 and R14 of the corners 13b and 14b on the coast side are processed. It has become. For example, if the workpiece is an involute spline with module 1.058, pressure angle 30 °, number of teeth 23, and roundness radius R5 = 0.35mm, the radius of biting tooth 12a is R12 = 0.25mm. The rounding radii of the adjustment teeth 13a and the finishing teeth 14a are R13 = R14 = 0.35 mm.
[0004]
[Problems to be solved by the invention]
The round radius dimension R14 of the corner of the finish tooth 14a on the tip side of the tip is determined by the size of the workpiece, and the involute spline in which the roundness R12 of the tip side of the bite portion 12a is processed. The reason why the radius is set to be smaller than the radius R6 of the tooth root is to reduce the rolling load of the adjusting tooth.
[0005]
However, as a typical pattern in which such a rolled flat die reaches the end of its service life, first, chipping occurs from the second half of the tooth subjected to the sand blasting process of the biting portion 12, thereby increasing the load on the finish tooth 14 and finishing. Often, tooth damage occurs, leading to the final tool life. Usually, the chipping of the latter half of the biting tooth is likely to occur at the tooth tip on the coast side and has a short life. Accordingly, an object of the present invention is to prevent chipping at the tip of the coast side of the second half of the tooth subjected to sandblasting (the second half of the biting tooth portion) and to extend the life of the rolling flat die.
[0006]
[Means for Solving the Problems]
As a result of research, the present inventors usually found that chipping damage occurs from the coast side tooth tip of the latter half of the tooth first subjected to the sandblasting treatment of the biting portion because the stress due to the rolling process generated in this portion is caused. This is because it is larger than other parts, and the stress concentration at this part is alleviated and distributed to other parts, so that the chipping damage at that part can be delayed, resulting in the extension of the final tool life. I thought it was possible.
[0007]
Therefore, in the present invention, a rolling flat die including a biting tooth portion, an adjustment tooth portion, a finishing tooth portion, and a relief tooth portion for machining an involute spline, the workpiece 1 from the tip portion of the biting tooth portion. The surface of the tooth of the biting tooth portion having a length equal to or greater than the rotation is sandblasted, and the biting tooth portion is a front biting tooth portion having a length equal to or longer than at least 1/2 rotation of the work piece from the tip portion. , And a rear biting tooth portion having a length corresponding to at least a half or more equivalent to the workpiece to be processed from a tooth adjacent to the rear end of the front biting tooth portion, and the adjustment tooth portion is located behind the biting tooth portion. A front adjustment tooth portion extending from the first tooth of the adjustment tooth portion adjacent to the end to a length corresponding to at least the half of the workpiece to be processed and at least a workpiece 1 from the tooth adjacent to the rear end of the front adjustment tooth portion. / 2 times Each of the teeth on the coast side of each tooth of the front biting tooth portion, the rear biting tooth portion, the front adjusting tooth portion, and the rear adjusting tooth portion, comprising a rear adjusting tooth portion up to a considerable length. Is rounded, and the round radius R1 on the coast side of the front biting tooth is less than the round radius R2 on the coast side of the rear biting tooth, and the rear biting tooth The radius R2 of the coast-side corner is equal to or larger than the radius R3 of the coast-side corner of the front adjustment tooth portion, and the radius R4 of the coast-side corner of the rear adjustment tooth portion is the front adjustment tooth. The rolling radius is less than the roundness radius R3 of the corner on the coast side of the portion, and the roundness radius R5 of the tip of the tooth of the finished tooth portion is the same as the roundness radius R6 of the root of the processed involute spline By providing the dice, the above problems can be solved. .
[0008]
That is, R1 <R2, R2 ≧ R3, R3> R4, and R5 = R6. Since the radius of the corner on the coast side of the front bite tooth (hereinafter, “the radius of the corner on the coast side” is simply referred to as “corner radius”) R1 is smaller than the corner radius R2 of the tooth bite on the rear bite. The rolling amount of the corner radius portion of the back biting tooth portion is reduced, the generated stress to the part is reduced, and the occurrence of damage is delayed. Further, the corner radius R2 of the rear bite tooth portion is set to be equal to or larger than the corner radius R3 of the front adjustment tooth portion, the corner radius R4 of the rear adjustment tooth portion is set to be less than the corner radius R3 of the front adjustment tooth portion, and the finished tooth portion Since the corner radius R5 is equal to the round radius R6 of the workpiece, at least the corner radius R2 of the rear biting tooth is maximized. The stress concentration is reduced.
[0009]
At this time, the amount of rolling of the front and rear adjustment tooth portion increases and the stress increases, but it can be seen that the stress concentrated on the corner radius portion of the rear bite tooth portion is dispersed in the front and rear adjustment tooth portion. It is considered that the stress balance of the entire die is improved. Also, since the corner radius is gradually reduced with the rear bite teeth and the front and rear adjustment teeth, and the amount of rolling is increased, the stress does not increase suddenly, and the front and rear adjustment teeth are damaged early. Absent. Rather, in the conventional one, the corner radius portion of the rear biting tooth portion is damaged early, the amount of rolling of the front and rear adjustment tooth portion increases unstablely, and the stress increases. This prevents damage to the parts and prevents an increase in stress on the front and rear adjustment teeth.
[0010]
More preferably, the radius of roundness R1 on the coast side of the front biting tooth is less than the radius R6 of the root of the involute spline to be processed, and the radius of roundness on the coast side of the rear biting tooth is set. R2 is 0.1 to 0.3 module larger than the round radius R1 on the coast side of the front biting tooth, and the round radius R3 on the coast side of the front adjustment tooth is the front portion. The radius R4 of the rear adjustment tooth portion is preferably set to be equal to the rounding radius R5 of the tip of the finish tooth portion, 0.1 to 0.3 modules larger than the radius R1 of the biting tooth portion. ).
[0011]
That is, R1 <R2, R2 ≧ R3, R3> R4, R5 = R6, R1 <R6, R2> R1 + 0.1-0.3 module, R3> R1 + 0.1-0.3 module, R4 = R5 = R6. The corner radius R1 of the front bite tooth is less than the round radius R6 of the workpiece root, and the corner radius R2 of the rear bite tooth is 0.1 to 0.3 than the corner radius R1 of the front bite tooth. The module radius is increased, and the corner radius R3 of the front adjustment tooth is set to 0.1 to 0.3 module larger than the corner radius R1 of the front biting tooth portion, and the corner radius R4, R5 of the rear adjustment tooth portion and the finishing tooth portion is taken. Since the round radius R6 of the tooth root of the workpiece is the same, the amount of increase is balanced, and the corner radius portion of the rear biting tooth portion is less damaged, so that the rolling amount of the front and rear adjustment tooth portion is stabilized.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described. 1A is a side view of a rolling flat die showing an embodiment of the present invention, FIG. 1B is a plan view of FIG. 1A viewed from above, and FIG. 1C is a view of a tooth of a front bite tooth portion. Enlarged view, (d) is an enlarged view of the tooth portion with the rear bite, (e) is an enlarged view of the front adjustment tooth portion, (f) is an enlarged view of the rear adjustment tooth portion, (g) is an enlargement of the finished tooth portion. FIG. In FIG. 1, the rolling flat die 1 of the present invention has a front bite tooth part 2 and a rear bite tooth part 3 in which a bite tooth part 10 in which a workpiece bites and the tooth height gradually increases is substantially equally divided. Consists of. An adjustment tooth portion 20 whose tooth height gradually increases so as to gradually shape the teeth of the workpiece is provided adjacent to the rear biting tooth portion 3, and the adjustment tooth portion 20 is substantially divided into the front adjustment tooth portion 4. And the rear adjusting tooth portion 5. Adjacent to the rear adjustment tooth portion 5, a finish tooth portion 6 having a substantially constant tooth height and a relief tooth portion 15 in which the workpiece can be easily escaped from the die are sequentially provided in the longitudinal direction. For example, the involute spline specifications of the workpiece to be machined are module 1.058, pressure angle 30 °, number of teeth 23, tooth width 20 mm, and radius of tooth round 0.35 mm.
[0013]
The lengths of the front biting tooth portion 2 and the rear biting tooth portion 3 are each equivalent to one rotation of the workpiece. The overall length of the biting tooth portion 10 is equivalent to two rotations of the workpiece. The corner 2b of the coast side tooth tip at the tip of the tooth 2a of the front bite tooth is rounded, and the rounding radius R1 is 0.3 mm, which is slightly larger than the conventional one. Further, the radius R2 of the corner roundness 3b of the tooth 3a of the rear biting tooth portion 3 is set to 0.55 mm, which is sufficiently larger than the conventional radius. In addition, the opposite side of both biting teeth is not chamfered or rounded as in the conventional case.
[0014]
The lengths of the front adjustment tooth part 4 and the rear adjustment tooth part 5 are each equivalent to one rotation of the workpiece. The entire length of the adjustment tooth portion 20 is equivalent to two rotations of the workpiece. The corner 4b of the coast side tooth tip at the tip of the tooth 4a of the front adjustment tooth portion 4 is rounded, the rounding radius R3 is 0.45 mm which is larger than the conventional one, and the opposite side is 0.3 mm. Further, the roundness radius R4 of the corner roundness 5b of the tooth 5a of the rear adjustment tooth portion 5 is 0.35 mm, which is the same as the conventional one, and the opposite side is 0.35 mm, which is the same size. Further, the length of the finish tooth portion 6 is equivalent to the rotation of the workpiece 1.2, roundness is provided at the corners 6b on both sides of the tooth tip of the tooth 6a, and the rounding radius R5 is the same as the roundness of the tooth root of the workpiece. It is 35 mm.
[0015]
【Example】
Using this rolled flat die, involute splines were rolled by an oil-based coolant system. The round radius of the coast side tip of the front bite tooth 2 which is relatively slow to damage is the same as that of a conventional rolling flat die, and the round radius of the coast side tip of the rear bite tooth where damage starts first. Since it was set large, the stress concentration on the coast side tooth tip was alleviated, damage to the tooth portion 3 with the rear bite could be reduced, and a life about 1.5 times longer than before could be obtained.
[0016]
In the examples, the rolling process using the oil-based coolant method has been described. However, even when a water-soluble coolant with low lubricity is used, or when the rolling process is performed by semi-drying by spraying a completely dry or minute mist, this implementation is performed. As in the example, the tool life extension effect can be expected.
[0017]
【The invention's effect】
The corner radius R1 of the front biting tooth of the rolling flat die for machining the involute spline is made smaller than the corner radius R2 of the rear biting tooth, and the corner radius R2 of the rear biting tooth is adjusted to the front. The corner radius R4 of the toothed portion is greater than or equal to the corner radius R4 of the rear adjusting tooth portion, which is less than the corner radius R3 of the front adjusting tooth portion, and the corner radius R5 of the finished tooth portion is the same as the rounding radius R6 of the workpiece. The corner radius R2 of the toothed portion is maximized, and the stress concentration on the coast-side corner radius portion of the rear biting tooth portion is reduced, so that the biting tooth portion where damage begins first with a conventional rolling flat die As a result, it is possible to extend the life of the coast side tooth tip of the tooth, preventing chipping at the coast side tooth tip of the latter half of the sandblasted tooth. It was.
[0018]
Furthermore, the corner radius R1 of the front bite tooth is less than the round radius R6 of the workpiece root, and the corner radius R2 of the rear bite tooth is 0.1 to 0.1 than the corner radius R1 of the front bite tooth. The corner radius R3 of the front adjustment tooth portion is increased by 0.1 to 0.3 modules larger than the corner radius R1 of the front biting tooth portion, and the corner radius R4 of the rear adjustment tooth portion is finished. Since the radius is the same as the roundness radius R5 of the tip of the tooth portion, the stress balance in each tooth portion is improved, and a rolled flat die having a longer life is provided.
[Brief description of the drawings]
1A is a side view of a rolling flat die showing an embodiment of the present invention, FIG. 1B is a plan view of FIG. 1A viewed from above, and FIG. 1C is a tooth of a front bite tooth portion; (D) is an enlarged view of the teeth of the rear bite teeth, (e) is an enlarged view of the teeth of the front adjustment tooth portion, (f) is an enlarged view of the teeth of the rear adjustment tooth portion, (g) ) Is an enlarged view of the teeth of the finished tooth portion.
2A is a side view of a conventional rolled flat die, FIG. 2B is a plan view of FIG. 2A viewed from the top, FIG. 2C is an enlarged view of a tooth of a biting tooth portion, and FIG. The enlarged view of the tooth of an adjustment tooth part, (e) is the enlarged view of the tooth of a finishing tooth part.
[Explanation of symbols]
1,11 Rolled flat dies 2 Front biting teeth 2a, 3a, 4a, 5a, 6a Teeth 2b, 3b, 4b, 5b, 6b Corner of tooth tip (corner of tooth tip)
2c Tip part 3 Rear biting tooth part 4 Front adjustment tooth part 5 Rear adjustment tooth part 6, 14 Finishing tooth part 10, 12 Biting tooth part 13, 20 Adjustment tooth part 15 Relief tooth part

Claims (2)

A rolling flat die consisting of a biting tooth part, an adjustment tooth part, a finishing tooth part and a relief tooth part for processing an involute spline,
The surface of the tooth of the biting tooth part from the tip part of the biting tooth part to a length equivalent to one rotation of the workpiece is sandblasted,
The biting tooth portion is at least a workpiece 1 from the front biting tooth portion extending from the tip portion to a length equivalent to at least a half rotation of the machining workpiece and a tooth adjacent to the rear end of the front biting tooth portion. / It consists of a tooth part with a rear bite up to a length equivalent to 2 rotations or more,
The adjustment tooth portion includes a front adjustment tooth portion extending from a first tooth of the adjustment tooth portion adjacent to the rear end of the biting tooth portion to a length equivalent to at least 1/2 of the workpiece to be processed, and the front adjustment tooth portion. A rear adjustment tooth portion from the tooth adjacent to the rear end to a length equivalent to at least 1/2 of the workpiece to be machined,
Corners on each coast side of each tooth of the front bite tooth part, the rear bite tooth part, the front adjustment tooth part, and the rear adjustment tooth part are rounded,
The radius of radius R1 on the coast side of the front bite tooth is less than the radius R2 of the corner on the coast side of the rear bite tooth,
The radius R2 of the corner on the coast side of the rear biting tooth portion is equal to or greater than the radius R3 of the coast side corner of the front adjustment tooth portion,
The round radius R4 of the coast side corner of the rear adjustment tooth portion is less than the round radius R3 of the coast side corner of the front adjustment tooth portion, and the round radius R5 of the tip of the tooth of the finish tooth portion is A rolling flat die characterized in that it has the same radius R6 as the root of the involute spline to be machined. The radius R1 of the coast side corner of the front biting tooth is less than the radius R6 of the root of the involute spline to be processed,
The radius of radius R2 on the coast side of the rear bite tooth is 0.1 to 0.3 modules larger than the radius of radius R1 on the coast side of the front bite tooth, and the front adjustment tooth The radius R3 of the corner on the coast side of the portion is 0.1 to 0.3 modules larger than the radius R1 of the front bite tooth, and the radius R4 of the rear adjustment tooth is equal to that of the finish tooth. 2. The rolling flat die according to claim 1, wherein the rolling die has the same radius as the corner radius R5.

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