JP5008189B2 - Gear forming method and apparatus - Google Patents

Description

  The present invention relates to a gear forming method and an apparatus therefor.

Conventionally, a material is inserted into an outer die engraving space having a tooth mold on the inner peripheral surface, and both end surfaces in the axial direction of the material are pressed by one end punch and the other end punch to form a gear having a tooth shape on the outer peripheral surface. A method is known (see Patent Document 1).
Japanese Patent No. 3758103

  As shown in FIG. 7, the forming apparatus for forming the gear includes an outer mold 112 having a die-sculpting space 115 in which a tooth die 116 is formed on the inner peripheral surface, and one end face for forming one end face in the axial direction of the gear W101. The mold 122, the other end face mold 123 that molds the other end face of the gear W101 in the axial direction, and the one end punch 124 and the other end punch 125 that can advance and retreat into the mold engraving space 115 of the outer mold 112 are provided.

  Here, at the time of forging, the other end face mold 123 presses the outer mold 112 in the axial direction, and the material W100 in the mold engraving space 115 presses the tooth mold 116 of the outer mold 112 in the direction perpendicular to the axis. The stress concentrates on the axial end of the tooth mold 116 of the outer mold 112. Therefore, in general, a C surface 118 is formed at the end of the tooth mold 116 in the axial direction so that the end of the tooth mold 116 in the axial direction is not missing.

  Therefore, when the material W100 is pressed by the one end punch 124 and the other end punch 125, the tooth profile 101 is formed while the meat of the material W100 flows into the C surface 118 of the axial end portion of the tooth mold 116, and the axis line of the gear W111. In some cases, a radial protrusion 105b protruding in the radial direction is formed on the direction end portion 108.

  When the gear W111 having the radial convex portion 105b is assembled to the product and meshed with the mating gear, there is a problem that the radial convex portion 105b contacts the mating gear and the meshing becomes shallow.

  This invention is made | formed in view of the said situation, and it aims at providing the shaping | molding method and apparatus of a gear which have favorable meshing | engagement.

Molding process of the gear of the present invention is a molding method of a gear having teeth on an outer peripheral surface, in the outer mold having a tooth die to press the material in the axial direction, the axial direction both ends of the tooth profile, in the radial direction A preliminary gear forming step of forming a preliminary gear having a protruding radial projection, and a pierced gear formed by punching the auxiliary gear or the axis of the auxiliary gear in the outer mold is moved to one side in the axial direction to press-fitting the axial one end with one end radial protrusions direction protrusions in the outer mold in the tooth die, one having one end tooth trace direction protrusion protruding in the tooth trace direction from the axial end face of the tooth-order While forming the gear, the primary gear is moved to the other side in the axial direction in the outer mold, and the other axial end having the other radial radial convex portion of the radial convex portion is placed in the outer mold. Press-fit, and has the other end streak direction convex part protruding in the streak direction from the axial end surface of the tooth profile And having a gear forming step of forming the next gear, a.

The gear molding apparatus of the present invention has an engraving space in which a tooth mold is formed on an inner peripheral surface, an outer mold having a C surface or an R surface at an axial end portion of the tooth mold, and an axis of the outer mold. an end face type in contact with the end face, has a punch that can advance and retreat in the Profiler space, a, in the axial direction both ends, and a molding station for molding a preliminary gear having a radial protrusion protruding radially the preliminary gear or piercing shaped gear punched the axis of the preliminary gear is moved in the axial direction one side in an outer mold, the axial direction one-end having one end radially projecting portion in the radial direction protrusions have a first knockout pressed into the tooth-shaped outer mold, a primary press-fitting station for molding the primary gear wheel having one end tooth trace direction protrusion protruding in the tooth trace direction from the axial end face of the tooth, the outer mold and the primary gear wheel And move the other end of the radial convex portion to the other side in the axial direction. A secondary gear having a second knockout that press-fits the other end in the axial direction into the outer tooth shape and having a convex portion in the other end protruding from the axial end surface of the tooth profile in the tooth trace direction. It has a first feature of having a secondary press-fitting station .

  The gear shaping apparatus according to the present invention has a second feature that the end face forming portion for forming the end face in the axial direction of the end face type preliminary gear has a protruding portion protruding in the axial direction.

According to the molding method of the gears of the present invention, in the molding method of a gear having teeth on an outer peripheral surface, in the outer mold having a tooth die to press the material in the axial direction, the axial direction both ends of the tooth profile, the diameter A preliminary gear forming step for forming a preliminary gear having a radial protrusion projecting in the direction, and a pierced gear formed by punching the axis of the auxiliary gear or the auxiliary gear, and moving the auxiliary gear to one side in the axial direction within the outer mold the axial one end with one end radially projecting portion in the radial direction protrusions press-fitted into the outer mold in the tooth die, the end tooth trace direction protrusion protruding in the tooth trace direction from the axial end face of the tooth The primary gear is formed , and the primary gear is moved in the axial direction to the other side in the outer mold, so that the other end in the axial direction having the other radial radial convex portion is the outer tooth shape The other end streak direction convex part which is press-fitted into and protrudes in the tooth streak direction from the axial end surface of the tooth profile. Because having a gear forming step of forming the secondary gears, the one end and the other end radially protruding portion has one end and is plastically deformed to the other tooth trace direction protrusions, tooth trace direction protrusion of the molded gear Does not hinder the meshing with the counter gear, and can provide a gear having a good mesh with the counter gear.

Further, according to the gear molding apparatus of the first feature of the present invention, the gear has a die-sculpting space in which a tooth die is formed on the inner peripheral surface, and the C surface or the R surface is provided at the axial end of the tooth die. It has an outer mold, abutting an end face type axial end surface of the outer mold, anda punch which can advance and retreat in the Profiler space, in the axial direction both ends, a radial protrusion protruding radially with A forming station for forming the spare gear and a pierced formed gear punched from the spare gear or the shaft center of the spare gear are moved to one side in the axial direction in the outer mold, and one end of the radial convex portion is radially convex. part have a first knockout press-fitting the axial one end portion to the tooth-shaped outer mold having one molding the primary gear wheel having one end tooth trace direction protrusion protruding from the axial end face of the tooth in the tooth trace direction order and press-fitting station, is moved to the other side in the axial direction of the primary gear in an outer mold, the radially projecting portion The other end streak direction convex part which has the 2nd knockout which press-fits the other end part of the direction of an axis which has the other end radial direction convex part to an external type tooth shape, and projects in a tooth streak direction from the axial direction end face of a tooth form And a secondary press-fitting station for forming a secondary gear having the above-described structure, the gear forming method of the present invention can be realized.

  Furthermore, according to the gear shaping apparatus of the second feature of the present invention, the end face forming portion for forming the end face in the axial direction of the end face type spare gear has a convex portion protruding in the axial direction, so the spare gear is formed. In this case, the flow of the meat is hindered by the convex portion, and it is difficult for the meat to flow into the C surface or the R surface of the axial end portion of the tooth mold, and the protruding amount of the radial convex portion can be reduced. It is possible to reduce the amount of protrusion from the gear end surface of the tooth-line direction convex portion formed by plastic deformation of the portion.

  Embodiments of the present invention will be described below with reference to FIGS. 1A is a sectional front view of a material, FIG. 1B is a sectional front view of a spare gear, FIG. 1C is a sectional front view of a pierced gear, and FIG. 1D is a sectional view of a primary gear. It is a front view, (e) is a cross-sectional front view of a secondary gear. 2 to 6 show the gear forming apparatus of the present invention, and FIG. 2 is a cross-sectional front view showing a state in which the outer mold and the material are conveyed by the conveying device. FIG. 3 shows a forming station, in which the left half is a state before pressing the material, and the right half is a partial cross-sectional front view showing a state where the material is pressed and a spare gear is formed. FIG. 4 shows a piercing station, in which the left half is a state before forming a through hole in the spare gear, and the right half is a part representing the state in which the axis of the spare gear is punched to form a pierced gear. It is a cross-sectional front view. FIG. 5 shows the primary press-fitting station, the left half is the state before press-fitting the axial end of the pierced gear into the outer mold, and the right half is the axial end of the pierced gear with the outer mold It is a partial cross section front view showing the state which press-fits and shape | molds a primary gear. FIG. 6 shows the secondary press-fitting station, the left half is the state before the other axial end of the primary gear is press-fitted into the outer mold, and the right half is the outer end of the primary gear in the axial direction. It is a partial cross section front view showing the state which press-fits in and shape | molds a secondary gear.

  A forming process of the secondary gear W4 from the cylindrical material W0 will be described with reference to FIG.

  As shown in FIG. 1A, the material W0 has a cylindrical shape. When both ends in the axial direction of the material W0 are pressed, a preliminary gear W1 having a tooth profile 1 on the outer peripheral surface is formed as shown in FIG. The tooth profile 1 of the spare gear W1 has one end radial protrusion 5a projecting radially from the tooth profile 1 at one axial end 8a of the spare gear W1, and the other axial end 8b of the spare gear W1. It has the other end radial convex part 5b which protrudes from the tooth profile 1 in the radial direction. When the axis of the spare gear W1 is punched, a pierced gear W2 having a through hole 7 extending in the axial direction is formed in the axis as shown in FIG. Next, one end 8a in the axial direction of the piercing gear W2 is press-fitted into a tooth mold 16 of the outer mold 12 to be described later, and one end protruding from the one end surface in the axial direction in the tooth trace direction as shown in FIG. The primary gear W3 having the tooth line direction convex portion 6a is formed. Subsequently, the other end 8b in the axial direction of the primary gear W3 is press-fitted into a tooth mold 16 of the outer mold 12 to be described later, and as shown in FIG. The secondary gear W4 having the end tooth line direction convex portion 6b is formed. Here, the primary gear W3 and the secondary gear W4 correspond to the gears W3 and W4 of the present invention, and the one end radial convex portion 5a and the other end radial convex portion 5b correspond to the radial convex portion 5 of the present invention. The one axial end 8a and the other axial end 8b correspond to the axial end 8 of the present invention, and the one end streak direction convex portion 6a and the other end streak direction convex portion 6b correspond to the teeth of the present invention. It corresponds to the stripe direction convex part 6.

  Next, based on FIGS. 2 to 6, from the conveying device 11, a forming station 21 for forming the preliminary gear W1 from the material W0, a piercing forming station 31 for forming the pierced forming gear W2 from the preliminary gear W1, and a pierced forming gear W2. The primary press-fitting station 41 for forming the primary gear W3 and the secondary press-fitting station 51 for forming the secondary gear W4 from the primary gear W3 will be described.

  2 includes an outer mold 12, a material W0 in the outer mold 12, a spare gear W1, a piercing gear W2, and a primary gear W3 sequentially from the material W0 inlet, a molding station 21, and a piercing molding station. 31, an apparatus for transporting to the primary press-fitting station 41 and the secondary press-fitting station 51, an arm 14 for gripping the outer mold 12, and an advanceable / retractable stopper for holding the material W 0 put into the mold carving space 15 of the outer mold 12 13. The outer die 12 conveyed by the conveying device 11 has a carved space 15 in which a tooth die 16 is formed on the inner peripheral surface, and an arm protrusion 17 into which the arm 14 is fitted is formed on the outer peripheral surface. It is molded into. And the C surface 18 is shape | molded in the axial direction both ends of the tooth mold 16.

  The molding station 21 shown in FIG. 3 includes an end mold 22 and the other end mold 23 that grip the outer mold 12 and the material W0 in the outer mold 12 in the axial direction, and an end punch 24 that presses one end surface of the material W0. And the other end punch 25 that presses the other end surface of the material W0. The one end face mold 22 has a one end punch insertion hole 26 for inserting one end punch 24 in the axial center, and the other end face mold 23 has another end punch insertion hole 27 for inserting the other end punch 25 in the axial center. The one end face forming portion 61 for forming one end face in the axial direction of the auxiliary gear W1 of the one end face mold 22 has a circumferential one end face mold convex portion 28 protruding in the axial direction in the molding space 15 of the outer mold 12. The other end face forming portion 62 for forming the other end face in the axial direction of the auxiliary gear W1 of the other end face mold 23 is a circumferential other end face type convex portion protruding in the axial direction into the carved space 15 of the outer mold 12. 29. Here, the one end face mold 22 and the other end face mold 23 correspond to the end face molds 22, 23 of the present invention, and the one end punch 24 and the other end punch 25 correspond to the punches 24, 25 of the present invention. The mold convex part 28 and the other end face type convex part 29 correspond to the convex parts 28 and 29 of the present invention, and the one end face forming part 61 and the other end face forming part 62 correspond to the end face forming parts 61 and 62 of the present invention. Applicable.

  The piercing molding station 31 shown in FIG. 4 includes an end holding die 32 and an other end holding die 33 for holding the outer die 12 and the auxiliary gear W1 in the outer die 12 in the axial direction, and a piercing punch for punching the axis of the auxiliary gear W1. 34. The one end holding mold 32 has one end punch insertion holes 36 for inserting the piercing punches 34 in the axial center, and the other end holding mold 33 has the other end piercing punch insertion holes 37 for inserting the piercing punches 34 in the axial center.

  The primary press-fitting station 41 shown in FIG. 5 includes a first outer mold holding mold 42 and a second outer mold holding mold 43 that hold the outer mold 12 in the axial direction, and one axial end 8a of the piercing molded gear W2 at the outer mold 12. A first knockout 44 that is press-fitted into the tooth mold 16. The first outer mold holding mold 42 has a first knock-out insertion hole 46 for inserting the first knock-out 44 into the axial center.

  The secondary press-fitting station 51 shown in FIG. 6 includes a third outer mold holding mold 52 and a fourth outer mold holding mold 53 that hold the outer mold 12 in the axial direction, and an axial other end 8b of the primary vehicle W3. And a second knockout 54 for taking out the secondary gear W4 from the tooth mold 16 after being press-fitted into the 12 tooth molds 16. The fourth outer mold holding mold 53 has a second knockout insertion hole 56 for inserting the second knockout 54 into the axis. Here, the primary press-fit station 41 and the secondary press-fit station 51 correspond to the press-fit stations 41 and 51 of the present invention, and the first knockout 44 and the second knockout 54 correspond to the knockouts 44 and 54 of the present invention.

  Next, a method of forming the gear W4 from the columnar material W0 will be sequentially described.

  First, as shown in FIG. 2, a columnar material W <b> 0 obtained by cutting a wire to a required length is put into a carving space 15 of the outer mold 12 held by an arm 14 constituting the transport device 11. A stopper 13 is provided in the transport device 11 below the outer mold 12, and the material W <b> 0 is held in the outer mold 12.

  Then, as shown in the left half of FIG. 3, the outer mold 12 and the material W0 conveyed by the conveyance device 11 (not shown) are arranged on the one end face mold 22 of the molding station 21. Then, the other end face mold 23 moves on the outer mold 12 and is closed. Subsequently, as shown in the right half of FIG. 3, the one end punch 24 and the other end punch 25 simultaneously move in the direction of the material W0 to press the material W0, thereby forming the preliminary gear W1 having the tooth profile 1 on the outer peripheral surface.

  Here, both end surfaces in the axial direction of the tooth mold 16 have C surfaces 18, one end face type convex portions 28 of the one end face mold 22, and other end face type convex portions 29 of the other end face mold 23. Therefore, while the one end face type convex part 28 and the other end face type convex part 29 prevent the inflow of meat into the C surface 18, some of the meat flows into the C surface 18, and the tooth profile 1 of the spare gear W 1. One end radial projection 5a and the other end radial projection 5b projecting in the radial direction are formed on the one axial end 8a and the other axial end 8b.

  Further, the auxiliary gear W1 is formed with one end projecting portion 3a projecting in the axial direction from the axial end surface of the tooth profile 1 on one end surface in the axial direction, and in the axial direction from the other axial end surface of the tooth profile 1 in the other axial end surface. The other end protruding portion 3b protruding in the shape is formed. A substantially conical end conical recess 2a is formed on the axial center of the one end protruding portion 3a, and a substantially conical other end conical recess 2b is formed on the axial center of the other end protruding portion 3b. Between the one end surface in the axial direction of the tooth profile 1 and the one end protruding portion 3a, a circumferential one end circumferential concave portion 4a is formed. Between the other end surface in the axial direction of the tooth profile 1 and the other end protruding portion 3b, a circumferential shape is formed. The other end circumferential recess 4b is formed.

  Next, as shown in the left half of FIG. 4, the outer mold 12 conveyed by the conveying device 11 (not shown) and the spare gear W <b> 1 held in the outer mold 12 are placed on the one end holding mold 32 of the piercing molding station 31. Be placed. Then, the other end holding mold 33 moves on the outer mold 12 and is closed. Subsequently, as shown in the right half of FIG. 4, the piercing punch 34 moves downward, punches out the axis of the spare gear W1, and forms the piercing gear W2 having the through hole 7 in the shaft.

  Further, as shown in the left half part of FIG. 5, the outer mold 12 conveyed by the conveying device 11 (not shown) and the pierce forming gear W <b> 2 held in the outer mold 12 are the first outer mold holding mold of the primary press-fitting station 41. 42. Next, the second outer mold holding mold 43 moves on the outer mold 12 to fix the outer mold 12. Subsequently, as shown in the right half part of FIG. 5, the first knockout 44 moves upward, and the axial one end 8 a including the one end radial projection 5 a of the piercing molded gear W <b> 2 is press-fitted into the tooth mold 16. Then, the primary gear W3 having the one-end streak direction convex portion 6a protruding in the streak direction from the one axial end surface of the tooth profile 1 is formed.

  Thereafter, as shown in the left half of FIG. 6, the outer mold 12 conveyed by the conveying device 11 (not shown) and the primary gear W <b> 3 held in the outer mold 12 are the third outer mold holding mold of the secondary press-fitting station 51. 52. Next, the fourth outer mold holding mold 53 moves on the outer mold 12 to fix the outer mold 12. Subsequently, as shown in the right half of FIG. 6, the second knockout 54 moves downward, and the other axial end 8 b including the other end radial protrusion 5 b of the primary gear W <b> 3 is placed in the tooth mold 16. The secondary gear W4 having the other end streak direction convex portion 6b protruding from the other end face in the axial direction of the tooth profile 1 in the tooth streak direction is molded. Then, the second knockout 54 further moves downward to take out the secondary gear W4 from the outer mold 12, and the molding of the secondary gear W4 is completed.

  The secondary gear W4 thus formed is assembled to the product and meshes with the counterpart gear. At this time, the one end toothed direction convex portion 6a and the other end toothed direction convex portion 6b formed on the secondary gear W4 do not hinder the meshing with the mating gear.

  As described above, according to the gear molding method of the present invention, in the gear molding method having the tooth profile 1 on the outer peripheral surface, the material W0 is pressed in the axial direction in the outer mold 12 having the tooth profile 16, and the tooth profile is obtained. A preliminary gear forming step of forming a preliminary gear W1 having a radial convex portion 5 protruding in the radial direction at one axial end portion 8, and an axial end portion 8 having the radial convex portion 5 as the outer mold 12; A gear forming step of forming gears W3 and W4 having tooth-line-direction convex portions 6 that are press-fitted into the tooth mold 16 and protrude in the tooth-line direction from the axial end surface of the tooth profile 1, and thus project in the radial direction. When the secondary gear W4 is assembled to the product and meshes with the mating gear, the radial projection 5 is plastically deformed into the tooth trace direction convex portion 6 protruding in the tooth trace direction from the axial end surface of the tooth profile 1. Will not be disturbed.

  Further, according to the gear molding apparatus of the present invention, the engraving space 15 in which the tooth die 16 is formed is provided on the inner peripheral surface, and the C surface 18 or the R surface is provided at the axial end of the tooth die 16. The outer die 12, end face dies 22, 23 that abut on the axial end face of the outer die 12, and punches 24, 25 that can advance and retreat in the engraving space 15. Press fitting having a molding station 21 for molding a preliminary gear W1 having a protruding radial projection 5 and knockouts 44, 54 for pressing the axial end 8 having the radial projection 5 into the tooth die 16 of the outer mold 12. Since the stations 41 and 51 are included, the method for forming the gears W3 and 44 of the present invention can be realized.

  Furthermore, according to the gear forming apparatus of the present invention, the end surface forming portions 61 and 62 for forming the end surfaces in the axial direction of the spare gear W1 of the end surface molds 22 and 23 have the protruding portions 28 and 29 protruding in the axial direction. When forming the preliminary gear W1, it becomes difficult for the meat to flow into the C surface 18 of the axial end portion of the tooth die 16, the amount of protrusion of the radial convex portion 5 can be reduced, and the radial convex portion 5 is plastically deformed. The protrusion amount from the axial direction end surface of the tooth trace direction convex part 6 shape | molded can be made small.

  In this embodiment, the one end radial convex portion 5a and the other end radial convex portion 5b are formed on the one axial end portion 8a and the other axial end portion 8b of the preliminary gear W1, but as shown in FIG. In addition, the present invention can also be applied to the case where the radial convex portion 5 is formed on only one of the axial end portion 8a and the axial other end portion 8b of the preliminary gear W1.

  Further, in the present embodiment, the C surface 18 is provided at the axial end portion of the tooth mold 16, but an R surface may be provided at the axial end portion of the tooth mold 16.

  Furthermore, although the present Example has demonstrated the spur gear, it is also applicable to the case of a helical gear.

(A) is a sectional front view of the material, (A) is a sectional front view of the spare gear, (C) is a sectional front view of the pierced formed gear, and (D) is a sectional front view of the primary gear. And (e) is a sectional front view of the secondary gear. It is a cross-sectional front view showing the state which is conveying the outer mold | type and a raw material with the conveying apparatus of this invention. The molding station of this invention is represented, A left half part is a state before pressing a raw material, A right half part is a partial cross section front view showing the state which presses a raw material and shape | molds a spare gear. The piercing molding station of the present invention is represented, the left half is a state before forming a through hole in the spare gear, the right half is a partial cross-section showing the state of punching the axis of the spare gear and molding the pierced gear It is a front view. 1 represents the primary press-fitting station of the present invention, the left half is the state before press-fitting one axial end of the pierced molded gear into the outer mold, and the right half is press-fitted one axial end of the pierced molded gear into the outer mold. And it is a fragmentary sectional front view showing the state which shape | molds a primary gear. Represents the secondary press-fitting station of the present invention, the left half is the state before the other axial end of the primary gear is press-fitted into the outer mold, and the right half is the other end in the axial direction of the primary gear is the outer mold. It is a partial cross-sectional front view showing the state which press-fits and shape | molds a secondary gear. The conventional gear shaping | molding apparatus is represented, The left half part is the state before pressing a raw material, The right half part is a partial cross section front view showing the state which presses a raw material and shape | molds a gearwheel.

Explanation of symbols

1 Tooth profile
5a One end radial projection
5b Radial convex part at the other end
6a One-side streak direction convex part
6b Convex direction convex part at the other end
8 axially both ends
8a Axial end
8b Other axial end portion 12 Outer die 15 Die-sculpting space 16 Tooth die 18 C surface 21, 31 Molding station 22, 23 End surface die 24, 25 Punch 28, 29 Convex portion
41 Primary press-fitting station
51 Secondary press-fitting station
44 first knockout
54 Second knockout 61, 62 End surface forming part W0 Material W1 Spare gear
W2 Pierced gear
W3 primary gear
W4 Secondary gear

Claims (3)

In the method of forming a gear having a tooth profile (1) on the outer peripheral surface,
In outer mold (12) in having the tooth die (16) to press the material (the W0) in the axial direction, the axial direction both ends of the tooth (1) (8), the radial protrusion protruding radially A preliminary gear forming step of molding the preliminary gear (W1) having (5);
The preliminary gear (W1) or a pierced gear (W2) in which the axis of the preliminary gear (W1) is punched is moved to one side in the axial direction in the outer mold (12), and the radial protrusion ( axial one end with one end radially projecting portion (5a) of one of the 5) (8 a) is pressed into the tooth form (16) of said outer die (12), the axial direction of the tooth (1) one end tooth trace direction protrusion protruding in the tooth trace direction from the end surface while forming a primary gear wheel (W 3) having a (6 a), the other side in the axial direction the primary gear wheel of (W3) in the outer mold (12) The other axial end portion (8b) having the other radial end portion (5b) of the other end portion in the radial direction (5) is moved into the tooth shape (16) of the outer die (12). A secondary gear that is press-fitted and has the other end streak direction convex portion (6b) projecting in the tooth streak direction from the axial end surface of the tooth profile (1). Molding method of gears and having a a gear forming step of forming a W4). An outer die (12) having a carved space (15) in which a tooth die (16) is formed on the inner peripheral surface, and having a C surface (18) or an R surface at the axial end of the tooth die (16). When,
End face molds (22, 23) contacting the axial end faces of the outer mold (12);
Has a punch (24, 25) which can advance and retreat in the Profiler space (15), axially both ends (8), the preliminary gear having radial protrusion protruding in a radial direction (5) ( A molding station (21) for molding W1);
The preliminary gear (W1) or a pierced gear (W2) in which the axis of the preliminary gear (W1) is punched is moved to one side in the axial direction in the outer mold (12), and the radial protrusion ( one end radial protrusions of 5) (5a) possess axial one end portion (8 a) the outer mold (12) first knockout (4 4 is press-fitted to the tooth die (16) of) with one end tooth trace direction protrusions from the axial end face projecting tooth trace direction to the primary press-station molding a primary gear wheel (W3) having (6a) (4 1) of the tooth (1),
The primary gear (W3) is moved in the axial direction to the other side in the outer mold (12), and the other axial end is provided with the other end radial projection (5b) of the radial projection (5). A second knockout (54) having a second knockout (54) for press-fitting the portion (8b) into the tooth mold (16) of the outer mold (12) and protruding in the tooth trace direction from the axial end face of the tooth profile (1) And a secondary press-fitting station (51) for forming a secondary gear (W4) having a directional convex portion (6b) . The end surface forming portions (61, 62) for forming the end surfaces in the axial direction of the auxiliary gear (W1) of the end surface type (22, 23) have convex portions (28, 29) protruding in the axial direction. The gear forming apparatus according to claim 2.

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