JP2002066686A - Gear forming method and device thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely secure the strength of a double stage gear having a spur gear and a helical gear and increase yield of raw material and simplify the manufacturing process and reduce the manufacturing cost. SOLUTION: A gear forming device 10 has a fixed part 14 and a movable part 16. The fixed part 14 is provided with a center guide 24, a lower punch 40 which is rotatable on the outer peripheral face of the center guide 24 and a die 84 by which the helical gear tooth forming part 86 is cut in the inner peripheral part. The angle θ of the tooth 87 of the helical gear tooth forming part 86 is set 30<θ<45 deg. with regard to the axial direction. The movable part 16 is provided with a mandrel 96, an insert punch sleeve 98 fitted in the mandrel 96, and the upper punch 112 which is slidable on the outer peripheral face of the insert punch sleeve 98. A spur gear forming part 136 is cut in the tip of the inner peripheral face of the upper punch 112.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear forming method and apparatus for forming gears by hot forging or cold forging.

[0002]

2. Description of the Related Art For example, a two-stage gear having a straight tooth portion and a helical tooth portion is used in a transmission of an automobile having a synchronization mechanism. In order to manufacture this two-stage gear, a method of manufacturing a two-stage gear by performing cutting with a cutter on a molded body having a straight tooth profile formed by hot forging to form a helical tooth profile. There is.

As another method, a two-stage gear is formed by welding a molded body having a straight tooth profile and a molded body having a helical tooth profile formed by cutting with a cutter and forming a helical tooth profile. Manufacturing method.

[0004]

However, in the manufacturing method according to the prior art described above, a helical tooth profile is cut by a cutter with respect to a formed body having a straight tooth profile formed by hot forging. In such a case, the torsion line (flow of the fiber structure due to plastic deformation) generated in the molded body may be cut by the cutter. As a result, there is a problem that the strength of the manufactured gear is remarkably reduced, and the material yield is deteriorated due to chips generated during cutting.

[0005] Further, when a molded body having a straight tooth profile and a molded body formed by cutting with a cutter and having a helical tooth profile are joined by welding or the like, a complicated welding operation is performed. Must be
It has been pointed out that the manufacturing process becomes complicated and the manufacturing cost rises.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a gear having a straight tooth profile and a helical tooth profile without performing machining or welding work by a cutter or the like. By manufacturing the gear, it is possible to ensure the strength of the gear, improve the material yield, and simplify the manufacturing process and reduce the manufacturing cost. An object is to provide a molding method and an apparatus therefor.

[0007]

According to the present invention, a gear material is placed on one end of a lower punch having external teeth, a mandrel is inserted into the gear material, and an insert punch sleeve and an upper punch are used. A first step of pressing the gear blank, and releasing the pressing force of the insert punch sleeve against the gear blank to separate the insert punch sleeve from the gear blank; and further pressing the gear blank by the upper punch. As a result, the gear material is caused to flow into the first tooth forming part formed on the die with which the external teeth mesh and the second tooth forming part formed on the upper punch, thereby forming the tooth part of the gear. And a third step of rotating the lower punch under the action of a knockout punch to release the gear from the die. It is characterized in. In this case, a helical tooth portion is formed on the gear material by the first tooth forming portion, and a straight tooth portion is formed on the gear material by the second tooth forming portion.

The present invention is also directed to a center guide, a knockout punch, a lower punch rotatably disposed on the outer peripheral surface of the center guide, and a first meshing with external teeth formed on the lower punch. A mandrel, an insert punch sleeve fitted to the mandrel, and a second slidable outer peripheral surface of the insert punch sleeve so as to face the die. An upper punch having a tooth forming portion is provided, and the knockout punch, the mandrel, and the upper punch are respectively connected to a first driving mechanism, a second driving mechanism, and a third driving mechanism, and While inserting a mandrel inside, the gear punch is formed by pressing the gear material with the insert punch sleeve and the upper punch. , The second driving mechanism and the third
Moving the knockout punch under the driving action of the first driving mechanism after the mandrel, the insert punch sleeve, and the upper punch are integrally separated from the gear under the driving action of the driving mechanism. And rotating the lower punch to release the gear from the die.

According to the present invention, since the first tooth-forming portion is formed in a helical shape and the second tooth-forming portion is formed in a straight shape, the helical member can be formed from the gear material without performing machining or welding by a cutter or the like. A two-stage gear having a tooth profile and a straight tooth profile can be manufactured at once. Thereby, it is possible to prevent the forging line generated in the forged molded body from being cut by mistake, and to avoid welding work. Accordingly, it is possible to reliably ensure the strength of the gear after molding, and it is possible to avoid generation of chips during molding of the gear, thereby improving the material yield and simplifying the gear manufacturing process. And a reduction in manufacturing cost can be achieved.

Further, when the gear is released from the die after the gear is formed from the gear material, the insert punch sleeve is fitted to the mandrel for centering the gear material. By synchronously driving the third drive mechanism and the third drive mechanism, the mandrel, the insert punch sleeve, and the upper punch can be integrally separated from the gear. Therefore, for example, there is no need to provide a dedicated pin for moving the mandrel or a drive mechanism for moving the pin. Therefore, the gear is formed only by installing three drive mechanisms for moving the insert punch sleeve, the upper punch, and the knockout punch before the gear is formed from the gear material and the gear is released from the die. be able to.

In the gear forming apparatus for carrying out the above-described gear forming method, a holder having a pin insertion opening formed therein is fitted to the upper punch, and a pin is implanted in the die. The upper punch and the die may be connected and rotated by being inserted into the pin insertion opening. The first tooth forming portion may be formed in a helical shape, and the second tooth forming portion may be formed. It is preferable to form it straight. That is, since the die and the upper punch are connected via the pin, the die and the upper punch can rotate in synchronization. Therefore, when the gear material is pressed by the upper punch, the flesh of the gear material flows into the helical first tooth forming portion and presses the first tooth forming portion to rotate the die. This allows the flesh of the gear material to flow reliably into the straight second tooth forming portion formed on the upper punch, thereby forming a straight tooth portion.

Further, it is preferable that the angle θ of the first tooth forming portion with respect to the axial direction of the tooth is set within a range of 30 ° <θ <45 °. When the angle θ is increased in the range of 30 ° <θ <45 °, the contact area between the teeth of the formed gear can be increased as much as possible. This allows, for example,
When a predetermined load is applied to the gear, the larger the contact area between the teeth is, the smaller the load applied per unit area becomes. Therefore, the load applied to the teeth constituting the gear is reduced, and the gear The life of the teeth can be prolonged, and the generation of the meshing sound between the teeth can be reduced as much as possible. In addition, since the load on the teeth constituting the gears is reduced, the reduction in the strength of the teeth can be prevented. For example, when a gear formed according to the present invention is used for a transmission of an automobile, the gear width is reduced. As a result, the transmission itself can be made compact. That is, according to the purpose, the angle θ of the first tooth forming portion with respect to the axial direction of the tooth is set to 30 ° <θ <4.
Since the desired angle can be set within the range of 5 °, the degree of freedom in design is improved.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A gear forming method according to the present invention will be described in detail below with reference to a preferred embodiment in relation to a gear forming apparatus, with reference to the attached FIGS. 1 to 9A and 9B. . The use of the gear forming device is not limited, but is preferably used, for example, for forming a two-stage gear used in a transmission of an automobile having a synchro mechanism.

The gear forming apparatus 10 according to the present embodiment
This is for forging a ring-shaped gear material 12 (see FIG. 9A) to form a two-stage gear 130 (see FIG. 9B), and has a fixed portion 14 and a movable portion 16 as shown in FIG. . The fixing portion 14 includes a gantry 18. The gantry 18 has a first concave portion 20 formed at a substantially central portion thereof, and a substantially rectangular shape formed radially outward with respect to the first concave portion 20. A second recess 22 is included. A substantially cylindrical center guide 24 is erected within the first recess 20 so as to extend upward in FIG. 1 from the first recess 20, and a claw portion surrounds the center guide 24. A first holder 30 including a main body 26 and a main body 28 is fixed on a first annular convex portion 32 formed between the first concave portion 20 and the second concave portion 22. The center guide 24 has a circumferential surface formed by the claw portion 2.
6 and a gap 3 surrounding the center guide 24 between the center guide 24 and the main body 28.
4 are formed.

A plurality of substantially cylindrical knockout punches 36 are provided concentrically so as to surround the center guide 24 through the mount 18, the claw portions 26 and the gap portions 34. The knockout punch 36 is centered by the center guide 24, and an annular spacer 38 mounted on the claw portion 26 of the first holder 30 is fixed to one end of the knockout punch 36, and The other end of the knockout punch 36 is connected to a first driving mechanism (not shown) at a lower part in FIG. Further, on the spacer 38, a lower punch 40 that can rotate around the outer peripheral surface of the center guide 24 is placed. In FIG. 1, the lower punch 40 is formed such that a lower portion is formed as a thick portion 42 and then an upper portion is formed as a thin portion 46 via a tapered portion 44. Helical external teeth 48 are engraved on the outer periphery of the distal end of the thin portion 46. Therefore, under the action of the first drive mechanism, the knockout punch 36 can move up and down in the vertical direction,
The lower punch 40 is also vertically movable via the spacer 38.

As shown in FIG. 2, gas dampers 54 are provided at the four corners of the second concave portion 22 at predetermined intervals from the axis of the center guide 24. A disk-shaped set plate 58 is fixed to the rod 56 of the gas damper 54 (see FIG. 1). As can be understood from FIG. 1, a coil spring 64 is interposed so as to surround the first annular projection 32, the first holder 30, and the knockout punch 36.

On the second annular convex portion 66 formed radially outward of the second concave portion 22, an annular bulging portion 68 is provided so as to cover the gas damper 54 and the set plate 58. Is fixed.
The outer peripheral surface 74 of the second holder 70 projects radially outward from the outer peripheral surface 72 of the gantry 18.

Further, an annular guide member 78 is attached to an annular flat portion 76 formed above the set plate 58, and a spacer 80 surrounding the lower punch 40 is rotated on the guide member 78. It is placed freely. A die 84 is fixed to the upper portion of the spacer 80, and a concave portion 82 having a tapered portion 81 is formed at the upper center of the die 84. On the outer peripheral portion of the upper flat surface 85 of the die 84, a synchronization pin 91 is implanted along the axis and directed upward in FIG. 1, and communicates with the recess 82 to form the helical tooth profile of the two-stage gear 130. A helical tooth forming portion 86 is formed to form the portion 132 (see FIG. 9B) (FIG. 3).
reference). The teeth 87 of the helical tooth forming part 86 are shown in FIG.
As shown in the figure, the blades are inclined at an angle θ with respect to the axial direction and are engraved at equal intervals over the entire circumference. In the present embodiment, the angle θ is preferably set in a range of 30 ° <θ <45 °.

An annular third holder 88 is fixed to the upper portion of the second holder 70, and the gas damper 54
The second stopper portion 92 provided on the die 84 in the radial direction of the die 84 is directed inward in the radial direction of the third holder 88 by the elastic force of the third holder 88. The first stopper portion 90 provided on the holder 88 is engaged.
A fourth holder 93 is fitted to the outer peripheral surfaces 72, 74, 89 of the gantry 18, the second holder 70, and the third holder 88, respectively.

As shown in FIG. 1, the movable portion 16 includes a rod 94, a substantially cylindrical mandrel 96 fixed to a substantially central portion of one end of the rod 94, and an insert fitted to the mandrel 96. And a punch sleeve 98. The mandrel 96 is for centering the gear blank 12 when forging the gear blank 12. The outer peripheral surface of the insert punch sleeve 98 has a first linear portion 100 and a first linear portion 10 from below in FIG.
First inclined at a predetermined angle in a direction away from the axis from 0
, A second linear portion 104 extending in the axial direction from the first taper portion 102, and a second linear portion 1
It comprises a second tapered portion 106 inclined at a predetermined angle in a direction away from the axis with respect to the axis, and a third linear portion 108 extending from the second tapered portion 106 in the axial direction. Further, the other end of the rod 94 is connected to a second driving mechanism (not shown) in the upper part of FIG. Therefore, under the action of the second drive mechanism, the rod 94 can move vertically in the vertical direction.

Further, a spacer 110 is provided so as to surround the rod 94, and an annular upper punch 112 slidable on the outer peripheral surface of the insert punch sleeve 98 is provided on the bottom surface of the spacer 110. Punch 1 on this
The inner peripheral surface of the fourth straight portion 1 is shown in FIG.
14, a third tapered portion 116 inclined at a predetermined angle in a direction away from the axis from the fourth linear portion 114, and a fifth linear portion extending in the axial direction from the third tapered portion 116 118, and a fourth tapered portion 120 inclined at a predetermined angle in a direction away from the axis from the fifth linear portion 118.
A fifth tapered portion 122 conforming to the shape of the tapered portion 81 formed in the concave portion 82 is formed. As will be understood from FIG. 1, a first straight portion 100 formed on the insert punch sleeve 98, a fourth straight portion 114 formed on the upper punch 112, and a fourth straight portion 114 formed on the insert punch sleeve 98. 2 straight portion 104 and the upper punch 1
12 is in contact with the fifth straight portion 118 formed therein.

A straight tooth forming portion 136 for forming the straight tooth portion 134 (see FIG. 9B) of the two-stage gear 130 is formed at the tip of the fourth straight portion 114 formed on the upper punch 112. (See FIG. 4). As shown in FIG. 4, the straight tooth profile portion forming portion 136 has a chamfer portion 138 at its tip, and is engraved over the entire circumference at equal intervals in the axial direction.

On the outer peripheral surface of the upper punch 112, a fifth holder 124 for supporting and fixing the upper punch 112 in the direction of the spacer 110 is fitted, and the spacer 110 and the fifth holder 124 are fitted with the spacer 110. A sixth holder 126 that is rotatable on the outer peripheral surface of is provided. This fifth
The holder 124 has a synchronization pin insertion hole 127 formed so as to cut out a part of the outer peripheral surface of the fifth holder 124. The synchronization pin insertion port 127 faces the synchronization pin 91 implanted in the die 84. The spacer 110 and the sixth holder 126 are connected to a third driving mechanism (not shown) in the upper part of FIG. Therefore, under the action of the third drive mechanism, the spacer 11
The 0 and the sixth holder 126 are vertically movable in the vertical direction. That is, the upper punch 112 is slidable vertically on the outer peripheral surface of the insert punch sleeve 98. The second drive mechanism (not shown) and the third drive mechanism (not shown) can be driven independently or synchronously.

The gear forming apparatus 10 according to the present embodiment
Basically, the configuration is as described above. Next, the operation and effects of the present invention will be described in relation to the gear forming method.

First, a second drive mechanism and a third drive mechanism (not shown) are driven in synchronization with each other, so that the movable section 16 is separated from the fixed section 14 as shown in FIG. Then, the ring-shaped gear material 12 (see FIG. 9A) is placed on the thin portion 46 of the lower punch 40. At this time, a part of the external teeth 48 engraved on the outer peripheral portion of the distal end of the thin portion 46 is engaged with the helical tooth forming portion 86 engraved on the inner peripheral portion of the die 84.

Thereafter, the second drive mechanism and the third drive mechanism (not shown) are driven synchronously to move the movable section 16 vertically downward so that the movable section 16 approaches the fixed section 14. (See FIG. 5). In this case, the upper punch 1 is inserted into the tapered portion 81 formed in the concave portion 82 of the die 84.
The fifth tapered portion 122 formed on the die 12 abuts, and the synchronization pin 91 implanted on the upper flat surface 85 of the die 84 is inserted into the synchronization pin insertion hole 127 formed on the fifth holder 124. And the mandrel 96 is the gear material 1
2 is inserted inside. Moreover, the gear blank 12 is pressed vertically downward by the insert punch sleeve 98 and the upper punch 112. Thereby, the gas damper 54
The set plate 58 and the spacer 80 against the resilience of
And the die 84 is pressed vertically downward. Therefore, the third
The engagement effect of the second stopper 92 provided on the die 84 with the first stopper 90 formed on the holder 88 is released, and the first stopper 90 and the second stopper 92 are disengaged.
The first gap portion 128 is formed between the first gap portion 128 and the stopper portion 92 (see FIG. 5). Further, since the lower punch 40 is rotatable on the outer peripheral surface of the center guide 24, the outer teeth 4
8 further meshes with the helical tooth forming portion 86 (see FIG. 5). At that time, a part of the meat of the gear material 12 flows in the helical tooth forming portion 86.

Next, a second drive mechanism (not shown) is driven to move the insert punch sleeve 98 vertically upward, and a third drive mechanism (not shown) is driven to drive the upper punch 112. Further, it is moved vertically downward. As a result, the pressing action of the insert punch sleeve 98 against the gear blank 12 is released, and the second punch blank 98 is inserted between the gear blank 12 and the insert punch sleeve 98.
Is formed (see FIG. 6). At the same time, against the resilience of the gas damper 54, the set plate 58,
The spacer 80 and the die 84 are further pressed vertically downward by the upper punch 112, and the first gap 1 formed between the first stopper 90 and the second stopper 92 is formed.
28 is expanded (see FIG. 6). At this time, gear material 1
The second flesh further flows into the helical tooth formation 86.
At this time, the gear material 12 rotates the outer peripheral surface of the mandrel 96 by a predetermined angle in a predetermined direction, and the helical tooth forming portion 86 is engraved in a helical shape. The helical tooth forming portion 86 is pressed while spirally flowing in the helical tooth forming portion 86. That is, a spiral force is applied to the die 84 in a direction away from the axis, but since the die 84 is pressed vertically downward by the upper punch 112, the die 84 The material 12 rotates by a predetermined angle in the rotation direction. In other words, the die 84 and the spacer 80 fixed to the bottom surface of the die 84
However, it rotates integrally on the guide member 78 about the shaft by a predetermined angle in the rotation direction of the gear blank 12. This allows
The helical tooth 132 of the two-stage gear 130 is formed (see FIG. 9B).

Further, at this time, since the die 84 and the fifth holder 124 are integrally connected by the synchronization pin 91, the die 84 is rotated in a predetermined direction by a predetermined angle, so that the fifth holder 124 is rotated. The holder 124, the upper punch 112 fitted to the fifth holder 124, and the sixth holder 126 that covers the fifth holder 124 are integrally rotated in synchronization with the die 84. As a result, the flesh of the gear blank 12 also flows into the straight tooth forming portion 136 engraved on the inner periphery of the tip of the upper punch 112. Accordingly, the straight tooth forming portion 136 of the two-stage gear 130 is also formed (see FIG. 9B).

Then, the second drive mechanism and the third drive mechanism (not shown) are driven synchronously to separate the movable section 16 from the fixed section 14 (see FIG. 7). That is, the mandrel 96, the insert punch sleeve 98, and the upper punch 1
12 will be integrally separated from the two-stage gear 130. As a result, the downward pressing force applied to the set plate 58, the spacer 80, and the die 84 against the elastic force of the gas damper 54 is released, and the die 8
The 4th second stopper 92 engages with the first stopper 90 of the third holder 88 (see FIG. 7).

Thereafter, the knockout punch 36 is moved vertically upward under the action of a first drive mechanism (not shown). At this time, the lower punch 40 rotates vertically upward while the external teeth 48 of the lower punch 40 mesh with the helical tooth forming portion 86 of the die 84 via the spacer 38 fixed to the knockout punch 36. At this time, the die 84 is engaged with the helical tooth profile 132 of the formed two-stage gear 130 and the helical tooth profile 86.
Is returned by a predetermined angle in a predetermined direction about the axis. That is, a state before the gear blank 12 is formed (a state shown in FIG. 1). As a result, the two-stage gear 130 is released from the die 84 (see FIG. 8).

The two-stage gear 130 is a transfer device (not shown)
Is transported to the next step, and is finally machined to a predetermined size and shape to complete the product.

[0032]

As described above, according to the present invention,
A two-stage gear having a helical tooth portion and a straight tooth portion can be manufactured at once from a gear material without performing machining or welding work with a cutter or the like. Thereby, it is possible to prevent the forging wire generated in the forged molded body from being cut by mistake, and it is possible to avoid as much as possible a complicated welding operation as in the related art. Therefore, it is possible to reliably ensure the strength of the gear after molding, and it is possible to avoid the generation of chips during molding of the gear, thereby improving the material yield and simplifying the manufacturing process. In addition, the manufacturing cost can be reduced.

Further, since the die and the upper punch are connected via the pins, the die and the upper punch can rotate in synchronization. Therefore, by pressing the gear blank with the upper punch, the flesh of the gear blank flows into the helical tooth forming section and presses the helical tooth forming section to rotate the die. As a result, the flesh of the gear material flows reliably into the straight tooth forming part formed on the upper punch, and the straight tooth part can be formed.

When the gear is released from the die after the gear is formed from the gear material, the insert punch sleeve is fitted to the mandrel for centering the gear material. By synchronously driving the third drive mechanism and the third drive mechanism, the mandrel, the insert punch sleeve, and the upper punch can be integrally separated from the gear. Therefore, for example, there is no need to provide a dedicated pin for moving the mandrel or a drive mechanism for moving the pin. Therefore, the gear is formed only by installing three drive mechanisms for moving the insert punch sleeve, the upper punch, and the knockout punch before the gear is formed from the gear material and the gear is released from the die. be able to.

Further, the angle θ of the helical tooth forming portion formed on the die with respect to the axial direction of the tooth is 30 ° <θ <45.
Is set to an angle within the range of ゜, the angle θ is set to 30 ° <
When the angle is increased within the range of θ <45 °, the contact area between the teeth of the formed gear can be increased as much as possible. Thus, for example, when a predetermined load is applied to the gear, the larger the contact area between the teeth is, the smaller the load applied per unit area is, so the load applied to the gear teeth is reduced. The life of the gear can be prolonged, and the generation of meshing noise between the teeth can be reduced as much as possible. Moreover,
By reducing the load on the gear teeth, the reduction in the strength of the teeth can be prevented. For example, when a gear formed according to the present invention is used in a transmission of an automobile, the gear width can be reduced, and thus the transmission can be reduced. The compactness of itself is achieved. That is, since the angle θ of the helical tooth forming portion with respect to the axial direction of the teeth can be set to a desired angle within a range of 30 ° <θ <45 ° according to the purpose, a specific effect of improving the degree of freedom in design is obtained. Can be

[Brief description of the drawings]

FIG. 1 is a partially omitted longitudinal sectional view showing a gear forming apparatus according to an embodiment.

FIG. 2 is an explanatory diagram viewed from the line II-II in FIG. 1;

FIG. 3 is a partially omitted enlarged longitudinal sectional view showing a die constituting the gear forming apparatus of FIG. 1;

FIG. 4 is a partially omitted enlarged longitudinal cross-sectional view showing a straight tooth forming shape portion engraved on an upper punch constituting the gear forming apparatus of FIG. 1;

5 is a partially omitted longitudinal sectional view showing a state in which the gear material is pressed by an insert punch sleeve and an upper punch in the gear forming apparatus of FIG. 1;

FIG. 6 is a partially omitted longitudinal sectional view showing a state in which the gear blank is further pressed by an upper punch from the state shown in FIG. 5;

FIG. 7 is a partially omitted vertical cross-sectional explanatory view showing a state where a movable portion is separated from a fixed portion in the gear forming device of FIG. 1;

FIG. 8 is a partially omitted vertical cross-sectional view showing a state in which the forged two-stage gear is released from the die in the gear forming apparatus of FIG. 1;

FIG. 9A is a perspective view showing a gear material, and FIG. 9B
FIG. 3 is a perspective view showing a two-stage gear after forging.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Gear forming device 12 ... Gear material 24 ... Center guide 36 ... Knockout punch 40 ... Lower punch 48 ... External teeth 86 ... Helical tooth forming part 87 ... Teeth 96 ... Mandrel 98 ... Insert punch sleeve 112 ... Upper punch 130 ... Two steps Gear 132: Helical tooth profile 134: Straight tooth profile 136: Straight tooth profile

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoichi Uehara 8-1, Honcho, Wako-shi, Saitama Honda Motor Co., Ltd. Wako Factory, Saitama Seisakusho Co., Ltd. Shioya 14 Nichidai Ujitawara Plant (72) Inventor Yasuyuki Kondo Zenjiji Ujitawara-cho, Shizuki-gun, Kyoto Shiotani 14 Futami (Nichidai Ujitawara Plant) F-term (reference) 3J030 BA01 BA05 BC06 BD09 CA10 4E087 AA02 AA10 CA14 EC13 EE02 HA02 HA04 HA82

Claims (6)

[Claims] A first material in which a gear material is placed on one end of a lower punch having external teeth, a mandrel is inserted into the gear material, and the gear material is pressed by an insert punch sleeve and an upper punch. And releasing the pressing force on the gear material by the insert punch sleeve to separate the insert punch sleeve from the gear material, and further pressing the gear material by the upper punch, so that the external teeth A second step of forming the gear tooth profile by flowing the gear material into the first tooth profile formed on the mating die and into the second tooth profile formed on the upper punch; A third step of rotating the lower punch under the action of a punch to release the gear from the die;
A gear forming method characterized by comprising: 2. The gear forming method according to claim 1, wherein a helical tooth is formed on the gear material by the first tooth forming part, and a straight tooth is formed on the gear material by the second tooth forming part. A gear forming method, wherein a part is formed. 3. A center guide, a knockout punch,
A lower punch rotatably disposed on the outer peripheral surface of the center guide; and a die having a first tooth forming portion that meshes with external teeth formed on the lower punch. A knockdown punch, wherein a mandrel, an insert punch sleeve fitted to the mandrel, and an upper punch slidable on an outer peripheral surface of the insert punch sleeve and formed with a second tooth forming portion are provided; The mandrel and the upper punch are connected to a first drive mechanism, a second drive mechanism, and a third drive mechanism, respectively, and the insert punch sleeve and the upper punch are connected to each other while the mandrel is inserted into a gear material. Presses the gear material to form a tooth profile of the gear, and drives the manwheel under the action of the second drive mechanism and the third drive mechanism. After the rel, the insert punch sleeve, and the upper punch are integrally separated from the gear, the lower punch is rotated by moving the knockout punch under the driving action of the first driving mechanism. A gear forming apparatus, wherein the gear is released from the die. 4. The gear forming apparatus according to claim 3, wherein a holder having a pin insertion opening is fitted to the upper punch, a pin is implanted in the die, and the pin is the pin. A gear forming device, wherein the upper punch and the die are connected and rotated by being inserted into an insertion opening. 5. The gear forming device according to claim 3, wherein the first tooth forming portion is formed in a helical shape, and the second tooth forming portion is formed in a straight shape. Gear forming equipment. 6. The gear forming device according to claim 3, wherein the angle θ of the first tooth forming portion with respect to the axial direction of the tooth is:
A gear forming apparatus characterized by being in the range of 30 ° <θ <45 °.