JPH1071434A - Gear punching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve quality of a punched gear by arranging a tooth tip protrusion group formed with tooth tip protrusions. SOLUTION: A tooth tip protrusion 5 is positioned at the outer diameter side of a tooth tip corresponding part 3a so as to face a tooth tip corresponding part 3a of a die. A space 52 is formed between the adjacent tooth tip protrusions 5. The tooth tip protrusion 5 is set to face the tooth tip corresponding part 3a of the die in the radial direction of a die hole but substantially not facing the tooth bottom corresponding part 3c. A gear having tooth part is punched from a plate-like stock by this gear punching device. Thus, the group of the tooth tip protrusions 5 continues intermittently on the face where a stock faces and the space 52 is formed between the adjacent protrusions 5. By this method, punching load is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a gear punching device.

[0002]

2. Description of the Related Art Conventionally, a gear punching device for punching a gear from a plate-shaped material has been developed. Japanese Patent Application Laid-Open No. 55-81026 discloses this gear punching apparatus.
As shown in FIG. 1, there is disclosed a gear punching device that includes a die 100, a reverse holder 102, a material holder 104, and a punch 106, and punches a gear from a plate-shaped material Wi. According to this device, the annular projection 200 is formed continuously on the surface of the die 100 facing the material Wi, that is, the upper surface 100c so as to make one round of the axis Pw concentrically. The annular projection 202 is also formed continuously on the surface of the material Wi facing the surface, that is, on the lower surface 104c so as to make one round of the axis Pw concentrically. According to this technique, since the annular projections 200 and 202 are provided, the material holding effect is improved, and the accuracy of the tooth portion of the punched gear is improved.

[0003]

However, in recent years, there has been an increasing demand for improved quality of stamped gears. Although the annular projections 200 and 202 are continuously provided around the gear as in the above-mentioned publication technology, they are not always sufficient for the demand for quality improvement in recent years. In particular, when the width of the tooth tip of the gear is large, a defective fracture surface is often generated at the tooth tip of the gear, and there is a limit in improving the quality of the stamped gear.

The present invention has been made in view of the above-described circumstances, and provides a gear punching device which is advantageous for punching a tooth tip of a gear when punching a gear from a plate-shaped material. That is the task.

[0005]

SUMMARY OF THE INVENTION The inventor of the present invention has been keenly developing a gear punching device, and has a tooth formed by a protruding tooth tip located near a tooth tip of a tooth part of a gear. The inventors have found that the provision of the projection group is advantageous in achieving the above-mentioned problem, and confirmed the results of the tests, thereby completing the present invention.

That is, a gear punching device according to the present invention is a gear punching device for punching a gear having a tooth portion from a plate-shaped material. The present invention is characterized in that a tooth tip projection group formed of tooth tip projections provided near the tooth tip is provided.

[0007]

According to the apparatus of the present invention, a tooth tip projection group formed by tooth tip projections protruding from a surface facing a material near a tooth tip of a gear tooth portion. Is provided. For this reason, the tooth tip projections bite into the vicinity of the region to be the tooth tip of the gear in the material. Therefore, the internal pressure of the region in the material becomes locally higher than that of other portions.

In the apparatus of the present invention, dies and material holders are representative members for forming the tooth tip projections. In consideration of extending the life of the tooth tip projection, it is preferable to form the tooth tip projection on the material holder rather than the die, but depending on the circumstances, a die may be used.

[0009]

【Example】

(First Embodiment) An embodiment of the present invention will be described below with reference to FIGS. In this embodiment, the precision blanking method (fine blankin
g). FIGS. 1A to 1C show the overall configuration of the mold apparatus according to the present embodiment. The mold device is
A die 1 having a die hole 10, a reverse retainer 2 inserted into the die hole 10 so as to be able to move up and down, a material holder 3, and a punch 4 inserted into the insertion hole 30 of the material holder 3 so as to be able to move up and down. .

In the precision punching method, as can be understood from FIG. 1A, when the punch 4 descends in the direction of the arrow Yd together with the material holder 3, the material W is pressed and held in the thickness direction by the material holder 3 and the die 1. Is done. Thereafter, as can be understood from FIG. 1B, since the punch 4 further descends in the direction of the arrow Yd, the material W is subjected to shearing. Thereby, as can be understood from FIG.
Is punched.

In the precision punching method described above, the material W is pressed in the thickness direction by the material presser 3 and the die 1 and the material W is pressed in the thickness direction by the reverse presser 2.
2, it can contribute to precision punching. In the present embodiment, as can be understood from FIG. 2, the insertion hole 30 of the material holder 3 has a substantially gear shape. The insertion hole 30 of the material holder 3 is provided with a tooth tip corresponding part 3a corresponding to the tooth tip of the gear tooth and a tooth root corresponding part 3c corresponding to the tooth root of the gear tooth.

In this embodiment, a tooth tip projection 5 is formed near the tooth tip corresponding portion 3c on the surface of the material presser 3 facing the material W, that is, the lower surface 3k. Thus, a tooth tip projection group 50 is formed. As can be understood from FIG. 2, the tooth tip protrusion group 50 is arranged along a virtual arc line having a radius Rc around the central axis Pc of the insertion hole 30.

As can be understood from FIG. 2, the tooth tip protrusion 5 is located on the outer diameter side of the tooth tip corresponding part 3a so as to face the tooth tip corresponding part 3a of the die 1. Adjacent tooth tip protrusion 5
A space 52 is formed between them. Therefore, as shown in FIG. 2, in the radial direction of the die hole 10, the tooth tip projection 5 faces the tooth tip corresponding portion 3 a of the die 1, but does not substantially face the tooth root corresponding portion 3 c.

The tooth tip projection 5 has an inner surface 5s and an outer surface 5t. As can be understood from FIG. 4, the inner surface 5s of the tooth tip protrusion 5
Is inclined downward in the radial direction, that is, in the direction of the arrow Xi. The outer surface 5t of the tooth tip projection 5 is inclined downward in the radial direction, that is, in the direction of the arrow Xo. Although the height of the tooth tip protrusion 5 can be appropriately selected according to the type of the gear, it is 0.3 to 3.0 mm, particularly 0.5 to 2.0 mm.
It has been.

According to a test conducted by the present inventor, as shown in FIG. 3, the width of the tooth tip protrusion 5 is A [mm], and the tooth tip portion of the gear, that is, the width of the tooth tip corresponding portion 3a of the material holder 3 is set. To B [m
m], it depends on the type of gear, but A =
It is preferable to set (1.0-3) × B, especially A = (1.5-2) × B. In addition, A and B mean the length of the circular arc around the central axis Pc.

In this embodiment, as described above, the blank W is pressed and held in the thickness direction by the blank 3 and the die 1 during the punching. At this time, the tooth tip protrusion 5 locally cuts into the material W. Therefore, in the material W, the internal pressure of the material region near the tooth tip of the gear, that is, the tooth tip corresponding portion 3a, is locally higher than the other regions. Therefore, when punching gears,
Even if the width B of the tooth tip of the gear is large, it is possible to prevent an abnormal fracture surface from being generated at the tooth tip of the gear as compared with the prior art in which the annular projection continuously makes one round. It is advantageous for This has been confirmed in tests.

Further, in the present embodiment, as can be understood from FIG. 2, the tooth tips 5 are intermittently continuous, and a space 52 is formed between the adjacent tooth tips 5 so that the annular shape is formed. As compared with the related art in which the projections 200 and 202 continuously make one round, the internal pressure in the tooth root portion of the gear, that is, the region corresponding to the tooth root corresponding portion 3c in the material W tends to be lower. Therefore, the punching load can be reduced.

In addition, according to the present embodiment, the positioning function for favorably positioning the material W by the tooth tip projections 5 can be secured. By the way, in the present embodiment, the reason why the punching formability of the tooth tip portion of the gear is particularly improved is presumed as follows. That is, at the time of punching, the flesh of the material tends to escape mainly in one direction at the root portion, but tends to escape mainly in three directions at the tip portion. For this reason, it is preferable to increase the internal pressure of the material near the tooth tip.

In this respect, according to the present embodiment, the tooth tip protrusion 5 locally cuts into the material W during the punching as described above.
Therefore, in the material W, the internal pressure in the material region near the tooth tip portion of the gear, that is, in the vicinity of the tooth tip corresponding portion 3a, is locally higher than in other regions, so that the annular projections 200 and 202 continuously rotate one round. As compared with the related art, the abnormal fracture surface at the tooth tip portion of the gear can be suppressed.

(Second Embodiment) A second embodiment shown in FIG.
The tooth tip projection group 5 including the tooth tip projections 5 is formed on the die 1. That is, as can be understood from FIG. 5, the die hole 10 of the die 1 has a substantially gear shape. The die hole 10 of the die 1 is provided with a tooth tip corresponding part 10a corresponding to the tooth tip of the gear tooth and a tooth root corresponding part 10c corresponding to the tooth root of the gear tooth.

In this embodiment, on the surface of the die 1 facing the material W, that is, the upper surface 1k, the tooth tip corresponding portion 1
A tooth tip projection 5 is formed near 0a. Thus, a tooth tip projection group 50 is formed. The tooth tip projection group 50 includes
The die hole 10 is arranged along a virtual arc line having a radius Rd around the central axis Pd. In this embodiment, the same operation and effect as those of the first embodiment can be obtained, and the tooth tip protrusion 5 locally bites into the material W, and the material W has a tooth tip portion of the gear, that is, the vicinity of the tooth tip corresponding portion 3a. The internal pressure in the material region is locally higher than in other regions, and the gear can be punched well.

The configuration of the first embodiment and the configuration of the second embodiment can be combined. That is, as in the first embodiment, on the surface of the material holder 3 facing the material W, that is, on the lower surface 3k, the tooth tip protrusion 5 is formed near the tooth tip corresponding portion 3a, and as in the second embodiment. , Material W in die 1
May be formed near the tooth tip corresponding portion 10a on the surface facing the tip, that is, on the upper surface 1k. In this case, it is preferable that the radius Rd and the radius Rc are matched with each other and the positions of the tooth tip projections are matched.

(Third Embodiment) This embodiment is a case where the present invention is applied to a facing die shearing method which is a typical precision shearing method. The overall configuration of this device is shown in FIGS. The apparatus includes a projection die 6 having a mold projection 62, a breakout punch 7 inserted through the projection die 6, a flat die 8, and an ejector punch 9 inserted through a die hole 80 of the flat die 8. I have.

In the opposing die shearing method, the projection die 6 moves upward together with the breakout punch 7 in the direction of the arrow Yu. The circular die W is pressed and held in the thickness direction by the flat die 8 and the ejector punch 9 waiting on the upper side. Further, as shown in FIG. 6B, the projection die 6 further rises in the direction of the arrow Yu together with the breakout punch 7. As a result, a cut is made in the material W between the mold projection 62 of the projection die 6 and the end face of the flat die 8, and
The extra meat Wm on the outer peripheral portion of the material W is in the radial direction, that is, the arrow X
Flows out in the o direction.

After that, as shown in FIG. 6C, the breakout punch 7 is further raised in the direction of arrow Y2, so that the material W is continuously subjected to shearing, and the gear Wc
Is completed. In this embodiment, as can be understood from FIGS. 7 to 9, the die hole 60 of the projection die 6 has a gear shape. In the die hole 60 of the projection die 6, a tooth tip corresponding part 6a for punching the tooth tip of the gear tooth and a tooth root corresponding part 6c for punching the tooth root of the gear tooth are provided. ing. On the surface of the projection die 6 facing the material W, that is, the upper surface 6k, the thickness of the material W is set in the radial direction, that is, the arrow Xo
An escape groove 67 for escape in the direction is formed radially.

In this embodiment, as can be understood from FIGS. 7 and 8, on the surface of the projection die 6 facing the material W, that is, on the upper surface 6k, the tooth protrusion 5 is located near each tooth tip corresponding portion 6a. Are formed. Thus, a tooth tip projection group 50 is provided. As shown in FIG. 7, the tooth tip projection group 50 is arranged along a virtual arc line having a radius Re around the central axis Pe of the die hole 60 of the projection die 6.

As in the case of the first embodiment, the projection dies 6
In the radial direction, the tooth tip projection 5 is provided so as to face the tooth tip corresponding portion 6 a of the projection die 6. The tooth tip protrusion 5 is located radially outside of the tooth tip corresponding portion 6a of the projection die 6. As shown in FIG. 8, since a space, that is, a relief groove 67 is located between the adjacent tooth tip protrusions 5, the die holes 6 are formed.
In the radial direction of 0, each tooth tip projection 5 faces the tooth tip corresponding part 6a of the projection die 6, but does not substantially face the tooth root corresponding part 6c.

Also in this embodiment, the tooth tip projection 5 is
s and an outer surface 5t. As can be understood from FIG. 9, the inner surface 5 s of the tooth tip protrusion 5 has a substantially parallel surface portion along the axial direction Pe of the die hole 60 of the protrusion die 6. The outer surface 5t of the tooth tip projection 5 is inclined downward in the radial direction, that is, in the direction of the arrow Xo. The height of the tooth tip projection 5 varies depending on the type of gear, but can be 0.3 to 3.0 mm, particularly 0.5 to 2.0 mm. Further, the outer diameter of the material W is preferably fitted to the inner surface 55 of the tooth tip projection 5. This enables the centering of the material and the mold.

According to a test conducted by the present inventor, as shown in FIG. 8, the width of the tooth tip protrusion 5 is C [mm], and the tooth tip portion of the gear, that is, the tooth tip corresponding portion 6a of the projection die 6 is D. [Mm], C = D +
(0.3-3.5), especially C = D + (0.5-1.
5). Also in the present embodiment, the excess thickness flows outward in the radial direction due to the notch processing, the outer diameter of the material W increases, and the tip projections are formed on the mold projections 62 of the projection dies 6 as in the first embodiment. Because 5 is formed,
At the time of punching, the tooth tip projections 5 bite into the material W, and the internal pressure in the tooth tip area is higher than in other parts. for that reason,
The generation of an abnormal fracture surface at the tooth tip of the gear can be suppressed, and the quality of the punched gear can be improved. In this embodiment, the same operation and effect as those of the first embodiment can be obtained, and the gear can be punched well. By the way, in the above-mentioned cutting, the flow output tends to be transmitted also to the flesh of the tooth tip of the gear due to the extra thickness of the tooth root flowing out in the radial direction. As a result, the flesh of the tooth tip escapes in the radially outward direction, and the tooth tip of the punched gear may be underfilled or sagged. In this embodiment, as shown in FIGS. 7 and 8, since the tooth tip projection 5 is formed on the mold projection 62 of the projection die 6, the tooth tip projection 5 has a barrier effect on the material W. In addition, it is possible to suppress the flesh of the material W from flowing out in the radial direction. For this reason, it is possible to suppress the occurrence of underfill or sagging at the tooth tip of the gear, and it is possible to form the tooth tip satisfactorily.

In the present embodiment, as described above, the inner surface 5s of the tooth tip projection 5 has a surface portion substantially parallel to the axial direction Pe of the die hole 60 of the projection die 6, so that the tooth tip projection 5 The barrier effect is improved, which is further advantageous in suppressing underfill and sag at the tooth tip of the gear. As described above, according to the present embodiment, the tooth tip protrusion 5 exerts a barrier effect, and it is possible to suppress the flesh of the material W from flowing out in the radially outward direction, which is advantageous for reducing the outer diameter size of the material W. is there.

(Fourth Embodiment) In the fourth embodiment, as can be understood from FIGS. 10 and 11, the die hole 80 of the flat die 8 is formed.
Has a gear shape. The die hole 80 of the flat die 8 is provided with a tooth tip corresponding part 8a corresponding to the tooth tip of the gear tooth and a tooth root corresponding part 8c corresponding to the tooth root of the gear tooth. On the surface of the flat die 8 that faces the material W, that is, on the lower surface 8k, a tooth tip portion 5 of the gear, that is, a tooth tip projection 5 is formed near the material of the tooth tip corresponding portion 8a. In this embodiment, the same operation and effect as those of the first embodiment can be obtained, and the gear can be punched well.

In this embodiment, the same operation and effect as those of the first embodiment can be obtained, and the gear can be punched well. (Supplementary Note) The following technical ideas can be understood from the above description. When the width of the tooth tip protrusion is A [mm] and the width of the tooth tip of the gear is B [mm], A = (1.0-3) × B, especially A = (1.5-2 2.) The apparatus of claim 1 wherein x is set to x). ○ The width of the tooth tip projection is C [mm], and the tooth tip of the gear is D
2. The apparatus according to claim 1, wherein, when [mm], C = D + (0.3 to 3.5), and in particular, C = D + (0.5 to 1.5). ○ A gear characterized in that a tooth tip group formed by tooth tip projections protruding and located near the tooth tip of the gear tooth is provided on each of both surfaces facing the material. Punching equipment.

[Detailed Description of the Invention]

[0034]

According to the device of the present invention, since the tooth tip projection group formed by the tooth tip projections provided near the tooth tip of the gear tooth portion is provided, Of these, the tooth tip projections dig into the vicinity of the area to be the tooth tip of the gear. For this reason, the internal pressure of the region in the material is locally higher than that of the other portions, as compared with the related art in which the annular protrusion continuously makes one round. Therefore, when a gear is punched out of a material and the tip of the gear is punched well, occurrence of an abnormal fracture surface can be suppressed. Therefore, it can contribute to improving the quality of the gear formed by punching.

Further, according to the apparatus of the present invention, the internal pressure in the vicinity of the tooth root of the punched gear can be made lower than that of the prior art in which the annular projection continuously makes one round. This is advantageous for reduction of

[Brief description of the drawings]

FIG. 1 is a process chart showing the operation of a punching die apparatus according to an embodiment applied to a precision punching method.

FIG. 2 is a bottom view showing a half of a material presser having a tooth tip projection.

FIG. 3 is an enlarged view of the vicinity of a tooth tip protrusion.

FIG. 4 is a sectional view of a material presser.

FIG. 5 is a plan view showing a half of a die having tooth tips.

FIG. 6 is a process chart showing the operation of the punching type apparatus according to the embodiment applied to the opposing die shearing method.

FIG. 7 is a plan view showing a half of a projection die having a tooth tip projection.

FIG. 8 is an enlarged plan view of a main part of a projection die having a tooth tip projection.

FIG. 9 is a sectional view of a projection die having a tooth tip projection.

FIG. 10 is a plan view showing a half of a flat die having tooth tips.

FIG. 11 is a cross-sectional view of a flat die having a tooth tip protrusion.

FIG. 12 is a sectional view of a main part according to the related art.

[Explanation of symbols]

In the figure, 1 is a die, 2 is a reverse press, 3 is a material press, 5
Denotes a tooth tip projection, 50 denotes a tooth tip projection group, 6 denotes a projection die, and 8 denotes a flat die.

Claims (1)

[Claims] 1. A gear punching device for punching a gear having a tooth portion from a plate-shaped material, comprising: a protruding portion positioned on a surface facing the material, near a tooth tip portion of the gear tooth portion; A gear punching device comprising a tooth tip projection group formed by the provided tooth tip projections.