JP2009012080A - External tooth forming roller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an external tooth forming roller suitably used in a cup-shaped gear manufacturing apparatus and method which enable a cup-shaped gear to be manufactured by short-time work and with a small forming power. <P>SOLUTION: The external tooth forming roller 30 has an external tooth forming die 30a at the circumferential surface and forms the external tooth on the outer circumferential surface of a workpiece formed into a cup shape by moving in the axial direction of the workpiece while rotating with respect to the workpiece thereby press-deforming the workpiece with the external tooth forming die 30a , wherein the roller is provided with: a tapered part 33 at the distal end side where the roller start to come in contact with the workpiece upon starting the work; and a catching part 34 for biting the workpiece at the starting time of the work and comprising projecting lines, projections, indentations, and knurling tool teeth or file teeth arranged in the tapered part 33. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  More specifically, the present invention relates to a cup-shaped gear having inner teeth and outer teeth on an inner peripheral surface and an outer peripheral surface, respectively, by press-deforming a cup-shaped workpiece. The present invention relates to an external tooth forming roller used in a manufacturing method and a manufacturing apparatus for manufacturing a roller.

  There is a cup-shaped gear in which inner teeth and outer teeth are formed on an inner peripheral surface and an outer peripheral surface by pressing and deforming a workpiece formed in a cup shape, respectively. Such cup-shaped gears include not only those in which both internal teeth and external teeth are used as gears, but also those in which either internal teeth or external teeth are used as gears. For example, although it is used as an internal gear with inward teeth or an external gear with outward teeth, a thin plate material is pressed and deformed to reduce material and weight. If the entire gear is to be formed, the external tooth or the internal tooth having a shape reversed to the internal tooth or the external tooth is inevitably formed with the formation of the internal tooth or the external tooth. This is because external teeth are provided.

  By the way, as a manufacturing method of such a cup-shaped gear, the following two methods can be illustrated typically.

(1) While a cup-shaped workpiece is externally fitted to a mandrel having an inner tooth mold for forming inner teeth, the outer peripheral surface of the workpiece is hit with a tooth groove forming roller for forming tooth grooves of the outer teeth. The method of forming the tooth gap forming roller in the axial direction of the work to form the tooth teeth of the outer teeth one by one, in other words, the inner teeth one by one (see “Patent Document 1” below).

(2) An external tooth forming roller having an external tooth forming die for forming an external tooth by externally fitting a cup-shaped work on a mandrel having an internal tooth forming die for forming an internal tooth and rotating the mandrel. The inner teeth and the outer teeth are formed on the inner peripheral surface and the outer peripheral surface of the workpiece by so-called “rolling” in which the workpiece is moved in the radial direction while rotating and pressed against the workpiece (hereinafter referred to as “Patent Document”). 2 ”).

JP-A-6-126373 JP 2001-58236 A

  However, in the manufacturing method (1), since the internal teeth must be formed one by one, when manufacturing a gear having a large number of teeth, there is a problem that the processing time becomes long. On the other hand, although the manufacturing method of (2) is rolling molding, the gear can be molded in a short time, but the entire peripheral surface of the work formed in a cup shape is pressed and deformed all at once. Therefore, there arises a problem that a large molding force is required and a large manufacturing apparatus must be used.

  The present invention has been made in view of the above-described actual situation, and is suitably used for a cup-shaped gear manufacturing method and a manufacturing apparatus capable of manufacturing a cup-shaped gear by short-time processing and with a small molding force. It is an object to provide an external tooth forming roller that can be used.

The main means taken by the present invention in order to solve the above-mentioned problems are as follows.
"The cup-shaped workpiece is externally fitted to a mandrel having an internal mold on the outer peripheral surface.
Rotating the work with the mandrel,
An external tooth forming roller having an external tooth forming die on the outer peripheral surface is rotated so that the external tooth forming die is synchronized with the internal tooth forming die and moved in the axial direction of the mandrel,
A method of manufacturing a cup-shaped gear, wherein the work is pressed and deformed by the mandrel and the external tooth forming roller to form internal teeth and external teeth on the inner peripheral surface and the outer peripheral surface of the work, respectively. "
It is.

Next, as a manufacturing device,
“A mandrel that has an inner mold on the outer peripheral surface and is externally fitted and rotationally driven with a cup-shaped workpiece;
An external tooth forming die is provided on the outer peripheral surface, and the external tooth forming die and the internal tooth forming die are rotationally driven so as to synchronize with each other and are driven to move in the axial direction of the mandrel, and the workpiece is pressed and deformed by the mandrel. And a cup-shaped gear manufacturing apparatus comprising an outer tooth forming roller for forming inner teeth and outer teeth on the inner peripheral surface and the outer peripheral surface of the workpiece, respectively. "
It is.

  In the manufacturing method and manufacturing apparatus having the above-described configuration, first, the workpiece is pressed and deformed by the rotating mandrel and the rotating external tooth forming roller, so that the workpiece can be processed in a shorter time than when forming the internal teeth one by one. It is possible to form inner teeth and outer teeth on the inner peripheral surface and the outer peripheral surface, respectively. Next, the external tooth forming roller is rotated and moved in the axial direction of the mandrel, so that the workpiece is pressed and deformed, so the amount of the workpiece that is pressed and deformed at a time is small, and the entire peripheral surface of the workpiece is pressed and deformed at once The molding force required is smaller than that required. Therefore, according to the manufacturing method and the manufacturing apparatus, the cup-shaped gear can be manufactured by a short time processing and with a small molding force.

In the above manufacturing method,
“A plate-shaped material is placed on the mandrel, and the material is pressed and deformed by an outer shape processing roller in accordance with the outer shape of the mandrel, thereby forming the workpiece and being externally fitted to the mandrel. Manufacturing method of cup-shaped gear "
It is good.

  According to such a manufacturing method, a cup-shaped gear can be formed from a plate-shaped material through a cup-shaped workpiece by a series of steps. When the material is pressed and deformed by the outer shape processing roller, the inner peripheral surface of the workpiece remains smooth if no material meat flows into the internal gear mold. On the other hand, if the meat of the material is allowed to flow slightly into the inner mold of the mandrel, the inner teeth can be molded on the inner peripheral surface of the workpiece while it is not completed. If it is made to completely flow, the internal teeth that follow the internal tooth mold can be completed on the inner peripheral surface of the workpiece. Here, in the aspect in which the internal teeth are already formed on the inner peripheral surface of the workpiece, in the above-described manufacturing method, only the outer peripheral surface of the workpiece is pressed and deformed by the external tooth forming roller, and the outer teeth are formed on the outer peripheral surface of the workpiece. Will be molded. Moreover, in such an aspect, since an external tooth is shape | molded after an internal tooth is shape | molded, a shaping | molding precision can be improved.

In the above manufacturing apparatus,
"A mandrel drive motor that rotationally drives the mandrel;
A drive motor for an external tooth forming roller that rotationally drives the external tooth forming roller;
A cup comprising: a controller for electrically controlling the mandrel drive motor and the external tooth forming roller drive motor so that the external tooth mold and the internal tooth mold are synchronized. Geared Gear Manufacturing Equipment "
It is good.

  As the means for rotating the mandrel and the external tooth forming roller so that the internal tooth mold and the external tooth mold are synchronized, various means can be adopted. A means including a mandrel drive motor, an external tooth forming roller drive motor, and a controller for electrically controlling the mandrel drive motor and the external tooth forming roller drive motor is employed. By adopting such means, the rotation state of the mandrel and the external tooth forming roller is controlled by a simple method such as electrical control by the control device, so that the internal tooth forming die and the external tooth forming die are surely secured. Can be tuned to. Moreover, even when the mandrel and the external tooth forming roller are changed with the type of cup-shaped gear to be manufactured, it is easy to change the rotation state of both the mandrel and the external tooth forming roller by the control device. From this, versatility as a manufacturing apparatus can be improved.

In the manufacturing apparatus described above,
“A cup-shaped gear manufacturing apparatus comprising an interlocking mechanism that mechanically interlocks the rotation of the mandrel and the external tooth forming roller”
It is good.

  Here, as the interlocking mechanism, an appropriate drive transmission device that transmits the rotational driving force of one member to the other member using an appropriate device such as a gear, a chain, a timing belt, and various links can be employed. .

  The manufacturing apparatus having the above configuration employs an interlocking mechanism that mechanically interlocks the mutual rotation of the mandrel and the external tooth forming roller as a means for synchronizing the internal tooth forming die and the external tooth forming die. It is possible to reliably synchronize the tooth mold and the external tooth mold.

Furthermore, in the manufacturing apparatus described above,
“The mandrel side interlocking mechanism provided on the mandrel side,
Separately from the mandrel side interlocking mechanism, it is provided on the external tooth forming roller side and is connected to the mandrel side interlocking mechanism at a stage prior to the start of workpiece processing. An external tooth forming roller side interlocking mechanism that mechanically interlocks the mutual rotation with the roller;
A mandrel drive motor for rotating the mandrel;
A drive motor for an external tooth forming roller that rotationally drives the external tooth forming roller;
The mandrel drive motor and the mandrel driving mechanism and the external tooth forming roller side interlocking mechanism are synchronized with each other before the mandrel side interlocking mechanism and the external tooth forming roller side interlocking mechanism are connected. A cup-shaped gear manufacturing apparatus comprising a control device that electrically controls a drive motor for an external tooth forming roller "
It is good.

  Although it is easy to control the rotation state of the mandrel and the external tooth forming roller by a motor that rotates and drives the mandrel and the external tooth forming roller, in the process of pressing and deforming the workpiece by the mandrel and the external tooth forming roller, the mandrel and the external tooth roller Since a large stress is applied to the molding roller, there is a possibility that a deviation that cannot be absorbed only by motor control may occur between the rotation of the mandrel and the rotation of the external tooth molding roller. In particular, since a great amount of stress is instantaneously applied to the mandrel and the external tooth forming roller at the start of processing, a large deviation tends to occur between the rotation of the mandrel and the external tooth forming roller. For this reason, there exists a possibility that a high quality cup-shaped gear with favorable dimensional accuracy cannot be manufactured.

  On the other hand, it is possible to reliably synchronize the mandrel and the external tooth forming roller by mechanically interlocking the rotation of the mandrel and the external tooth forming roller. However, in this case, the following problem occurs. That is, since the mandrel and the external tooth forming roller are relatively moved by appropriate movement driving means, the rotation is always performed regardless of the relative position change between the mandrel and the external tooth forming roller. In order to link the two, the structure for realizing the interlock becomes complicated and large, and the entire apparatus becomes complicated and large.

  Therefore, in the above configuration, the mandrel side interlocking mechanism is provided on the mandrel side, the external tooth forming roller side interlocking mechanism is provided on the external tooth forming roller side, and the mandrel side interlocking mechanism and the external tooth forming roller are provided. The side interlocking mechanism is connected at a stage before starting the work of the workpiece, and the mutual rotation of the mandrel and the external tooth forming roller is mechanically interlocked during the processing of the workpiece. Accordingly, the mandrel and the external tooth forming roller can be mechanically synchronized with each other during the processing of the workpiece. Further, since the mandrel side interlocking mechanism and the external tooth forming roller side interlocking mechanism are provided separately, the respective rotations are always interlocked regardless of the relative position change between the mandrel and the external tooth forming roller. A complicated and large-scale structure such as a structure is not required, and the entire apparatus is not unnecessarily complicated and enlarged.

  In addition, the mandrel side interlocking mechanism and the external tooth forming roller side interlocking mechanism are connected at the stage before starting the work of the workpiece. In this connection, a mandrel drive motor for rotating the mandrel, an external motor The mandrel side interlocking mechanism and the external tooth forming roller side interlocking mechanism are controlled to synchronize with each other by a control device that electrically controls an external tooth forming roller drive motor that rotationally drives the tooth forming roller. Therefore, the mandrel side interlocking mechanism and the external tooth forming roller side interlocking mechanism can be smoothly connected, and the entire apparatus can be operated satisfactorily.

As an external tooth forming roller,
“It has an external tooth mold on the outer peripheral surface, moves in the axial direction of the work while rotating with respect to the work formed in a cup shape, and presses and deforms the work by the external tooth mold, and the outer periphery of the work An external tooth forming roller for forming external teeth on the surface,
An external tooth forming roller characterized by having a biting portion that bites the workpiece at a portion that comes into contact with the workpiece at the start of machining.
It is.

  When the workpiece is pressed and deformed by the external tooth forming roller, the external tooth forming roller of the external tooth forming roller does not sufficiently bite the workpiece at the initial stage of processing when the external tooth forming roller starts to contact the work. Slip may occur between the workpiece and the external tooth forming roller. When slipping occurs in this way, external teeth are not formed at an accurate portion of the outer peripheral surface of the workpiece, and processing accuracy may be reduced. In particular, in an external tooth forming roller that is driven to move in the axial direction of the workpiece, such as the external tooth forming roller used in the above-described manufacturing method and manufacturing apparatus, there is a deviation from the outer peripheral surface of the work at the start of processing. Then, the external tooth forming roller moves in the axial direction of the workpiece without correcting the deviation, and the external tooth forming process proceeds. Even if the rotation of the external tooth forming roller is synchronized with the rotation of the workpiece by electrical control or mechanical interlocking, slippage or In some cases, phase shift due to gear backlash or the like may occur.

  On the other hand, in the external tooth forming roller having the above-described configuration, the work and the external tooth forming roller are provided at the initial stage of processing since the portion that contacts the work is provided with a biting portion that bites the work at the start of processing. Slip is less likely to occur between Therefore, according to this external tooth shaping | molding roller, an external tooth can be shape | molded in the exact site | part of the outer peripheral surface of a workpiece | work, and a processing precision can be improved.

  In addition, the biting part may be anything that increases the contact resistance with the workpiece so that slippage between the workpiece and the workpiece is less likely to occur, and as a specific form, protrusions, protrusions, irregularities, knurled eyes, A file or the like can be exemplified.

  As described above, according to the present invention, the cup-shaped gear can be manufactured by a short-time processing and with a small molding force, and can be suitably used for a cup-shaped gear manufacturing method and manufacturing apparatus. Can be provided.

  Next, an example of an embodiment of a cup-shaped gear manufacturing method and manufacturing apparatus and an external gear forming roller according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows an example of a cup-shaped gear manufacturing apparatus 100. The manufacturing apparatus 100 externally fits and rotates a cup-shaped workpiece 2 to a mandrel 20 described later, and press-deforms the workpiece 2 with the mandrel 20 and an external tooth forming roller 30 described later, so that the inner peripheral surface of the workpiece 2 is obtained. A cup-shaped gear is manufactured by molding inner teeth and outer teeth on the outer peripheral surface and the outer peripheral surface, respectively. Note that the manufacturing apparatus 100 of this example also includes an outer shape processing apparatus (not shown) that forms a flat disk-shaped material into a cup-shaped outer shape. The workpiece 2 formed in the above is in a state of being fitted on the mandrel 20.

  The manufacturing apparatus 100 includes a main shaft 10 that is rotatably supported by a frame (not shown) that forms a base of the apparatus, and inner teeth are formed on the inner peripheral surface of the workpiece 2 on the main shaft 10. A mandrel 20 provided with an inner tooth mold 20a for the outer peripheral surface is mounted so as to be replaceable. The main shaft 10 is rotationally driven by a main shaft drive motor 12 via a drive transmission device configured using a timing belt 14, an intermediate pulley 13, and the like. Here, when the main shaft 10 rotates, naturally, the mandrel 20 attached to the main shaft 10 also rotates. Therefore, the main shaft drive motor 12 is also a mandrel drive motor that rotationally drives the mandrel 20. As the main shaft drive motor 12, a servo motor capable of controlling the number of rotations and the rotation angle with high accuracy is used. This main shaft drive motor 12 is connected to a control device 40, and this control device The drive is controlled by 40.

  On the other hand, the external tooth forming roller 30 provided on the outer peripheral surface with an external tooth forming die 30a for forming external teeth on the outer peripheral surface of the work 2 is provided on the frame with respect to the main shaft 10 in the axial direction of the main shaft 10 and It is supported so as to be movable in the radial direction. The external tooth forming roller 30 is driven to move with respect to the main shaft by a moving drive device (not shown) connected to the control device 40 and controlled by the control device 40. Here, as the movement drive device, a device constituted by appropriate devices such as a fluid pressure cylinder and a feed screw mechanism can be used.

  The external tooth forming roller 30 is also rotationally driven by an external tooth forming roller drive motor 32. Here, as the drive motor 32 for the external tooth forming roller, a servo motor capable of controlling the rotation speed and the rotation angle with high accuracy is used. The external tooth forming roller drive motor 32 is connected to the control device 40, and the drive is controlled by the control device 40. In addition, an appropriate drive transmission device (not shown) such as a reduction gear is interposed between the external tooth forming roller drive motor 32 and the external tooth forming roller 30 to drive the low-power external tooth forming roller. A sufficient rotational driving force of the external tooth forming roller 30 can also be obtained by the motor 32.

  By the way, the main shaft 10 and the external tooth forming roller 30 can be individually driven to rotate, but the work 2 is pressed and deformed by the mandrel 20 and the external tooth forming roller 30, and the internal teeth are formed on the peripheral surface of the work 2. In addition, during the molding process of the external teeth, the rotational driving force of the main shaft 10 is transmitted to the external tooth forming roller 30, and the main shaft 10 and the external tooth forming roller 30 are interlocked, thereby forming the internal teeth of the mandrel 20. The mold 20a and the external tooth forming mold 30a of the external tooth forming roller 30 rotate in synchronization. Specifically, a main shaft side gear 11 is attached to a portion of the main shaft 10 below the mandrel 20, and an outer tooth forming roller side gear 31 is attached to the lower end of the external tooth forming roller 30. When the workpiece is attached to or detached from the main shaft 10, the external gear forming roller 30 is largely separated from the main shaft 10, and the main shaft side gear 11 and the external gear forming roller side gear 31 are not engaged with each other. When the external gear forming roller 30 approaches the main shaft 10 with the start of the processing, the main shaft side gear 11 and the external gear forming roller side gear 31 mesh with each other before the processing starts. Thereby, the external gear forming roller 30 rotates in conjunction with the main shaft 10. Further, after the main shaft side gear 11 and the external tooth forming roller side gear 31 are engaged, the internal tooth forming die 20a of the mandrel 20 and the external tooth forming die 30a of the external tooth forming roller 30 are maintained in synchronization.

  Such a gear mechanism using the main shaft side gear 11 and the external tooth forming roller side gear 31 shows a specific example of an interlocking mechanism that interlocks the rotation of the mandrel 20 and the rotation of the external tooth forming roller 30. The main shaft side gear 11 shows a specific example of the mandrel side interlocking mechanism, and the external tooth forming roller side gear 31 also shows a specific example of the external tooth forming roller side interlocking mechanism. The mandrel side interlocking mechanism and the external gear forming roller side interlocking mechanism are not limited to those constituted by a single gear, but may be a gear mechanism using a plurality of gears, or a gear mechanism. Not limited to this, a drive transmission mechanism having another appropriate structure using various links, chains, or the like may be used.

  In this example, the main shaft 10 is fixed to the frame so as not to move, and a high-output rotational driving force can be obtained from the main shaft 10. Therefore, it is preferable to employ an inverter motor as the main shaft drive motor 12. In this case, as shown by a two-dot chain line in FIG. 1, for example, the intermediate pulley 13 is provided with a detection device 15 such as an encoder that can accurately determine the rotation speed and the rotation angle. The main shaft drive motor 12 may be controlled based on information from the detection device 15. The part where the detection device 15 is provided is not limited to the intermediate pulley 13 but may be another part such as the main shaft drive motor 12 or the main shaft 10.

  Next, the operation | movement aspect of the manufacturing apparatus 100 of this example is demonstrated below with the manufacturing method of a cup-shaped gearwheel. As described above, the manufacturing apparatus 100 of the present example includes an outer shape processing apparatus that forms a flat disk-shaped material into a cup-shaped outer shape. First, the material is processed by the outer shape processing apparatus. It explains from.

  As shown in FIG. 2, the material 1 formed into a flat disk shape by punching a steel plate is placed on the upper surface of the mandrel 20 of the main shaft 10 (a), and the presser member 16 above the main shaft 10 is lowered. The material 1 is clamped and fixed by the mandrel 20 and the pressing member 16 (b). Next, the main shaft 10 is rotated, and the material 1 is rotated along with this, and the material 1 is pressed and deformed in accordance with the outer shape of the mandrel 20 by the outer shape processing roller 50 of the outer shape processing apparatus (c). A workpiece 2 having a cup-like appearance is formed from the material 1 (d). Here, the workpiece 2 thus formed in a cup shape has a shape having a disk-like flange portion 2a on the upper end side and a cylindrical portion 2b extending below the flange portion 2a. Further, the workpiece 2 is externally fitted to the mandrel 20 at the end of the forming process of the material 1. Furthermore, in this example, when the workpiece 1 is formed by pressing and deforming the material 1 by the outer shape processing roller 50, the completed internal teeth are molded on the inner surface of the cylindrical portion 2 b of the workpiece 2.

  Although not described in detail, the outer shape processing roller 50 is movably supported by the frame and is driven to move by a driving device (not shown) whose driving is controlled by the control device 40. Further, the outer shape processing roller 50 is rotatably supported by a pedestal portion (not shown) that is movably supported by the frame, and rotates following the material 1 that rotates with the main shaft 10, thereby smoothing the material 1. It is pressed and deformed in a cup shape. Furthermore, the contour processing apparatus of the present example includes a plurality of contour processing rollers 50 such as two, and the material 1 is moved a plurality of times by the plurality of contour processing rollers 50 until it becomes the cup-shaped workpiece 2. A press deformation process is performed.

  Next, as shown in FIG. 3, a cylindrical portion 2 b that is a peripheral surface of the work 2 that is formed in a cup shape and is externally fitted to the mandrel 20 is provided with an inner mandrel 20 and an external tooth forming roller 30. External teeth are molded in the same phase as the teeth. In this forming process, first, the external gear forming roller 30 located at a position sufficiently separated from the main shaft 10 is brought close to the main shaft 10, that is, the workpiece 2 so as not to interfere with the forming process of the material 1 ( a). At this time, since the spindle 10 is driven to rotate and the mandrel 20 and the work 2 are still rotated, the rotation state of the spindle 10 is monitored by the control device 40, and the monitoring result is fed back to provide a mandrel. The external tooth forming roller 30 is rotated so that the external tooth forming die 30a is synchronized with the 20 internal tooth forming dies 20a. Further, in this state, the main shaft side gear 11 and the external tooth forming roller side gear 31 are not connected to each other, and the main shaft 10 and the external tooth forming roller 30 are not interlocked and rotate independently. It is possible.

  Next, the external gear forming roller 30 is lowered with respect to the main shaft 10, and the main shaft side gear 11 and the external gear are formed at a stage before the start of processing, that is, before the external tooth forming roller 30 contacts the workpiece 2. The roller side gear 31 is engaged. At this time, the rotation of the main shaft 10 and the external gear forming roller 30 is controlled so that the main shaft side gear 11 and the external gear forming roller side gear 31 are synchronized, and the main shaft side gear 11 and the external gear forming roller side gear 31 are controlled. Meshes smoothly.

  After the main shaft side gear 11 and the external tooth forming roller side gear 31 are engaged, the external tooth forming roller 30 is further lowered with respect to the main shaft 10, that is, the external tooth forming roller 30 is driven to move in the axial direction of the mandrel 20. Then, the work 2 is pressed by the external tooth forming roller 30, and the peripheral surface of the work 2 is deformed by the internal tooth forming die 20a of the mandrel 20 and the external tooth forming die 30a of the external tooth forming roller 30 (b). At this time, as a matter of course, the internal tooth forming die 20a of the mandrel 20 and the external tooth forming die 30a of the external tooth forming roller 30 remain in synchronization with each other, so Teeth and external teeth are formed, and a high-quality cup-shaped gear 3 with good dimensional accuracy is formed. The external tooth forming roller 30 is rotationally driven by the external tooth forming roller drive motor 32 even during processing, but after the main shaft side gear 11 and the external tooth forming roller side gear 31 are engaged. Since it rotates in conjunction with the main shaft 10, the operation of the external tooth forming roller drive motor 32 may be stopped and the external tooth forming roller 30 may be rotated by the rotational driving force of the main shaft 10.

  By the way, at the time of starting machining, the external teeth forming roller 30 rotates in conjunction with the main shaft 10 by the meshing of the main shaft side gear 11 and the external gear forming roller side gear 31, and the external teeth are applied to the flange portion 2 a of the workpiece 2. The forming roller 30 starts to contact. Then, as the external tooth forming roller 30 moves in the axial direction with respect to the work 2, the external tooth forming die 30a presses the outer peripheral surface of the cylindrical portion 2b of the work 2 to press and deform the peripheral surface of the work 2. However, a truncated cone-shaped tapered portion 33 is provided on the distal end side of the external tooth forming roller 30, and at the initial stage of processing, the tapered portion 33 is formed at the boundary portion between the flange portion 2a and the cylindrical portion 2b. The corner of the workpiece 2 is brought into contact with the workpiece 2 so that the pressing deformation of the workpiece 2 is smoothly started. The tapered portion 33 of the external tooth forming roller 30 is not limited to a truncated cone shape, and may be a curved surface shape such as an R surface or a curved surface appropriately combined with a curvature. By providing the taper portion 33 in this way, the meat of the workpiece 2 can be flowed well in the axial direction before the workpiece 2 is pressed and deformed by the external tooth forming die 30a.

  Further, as shown in FIG. 4, the tapered portion 33 of the external tooth forming roller 30 is provided with a biting portion 34. For this reason, in the initial stage of processing, slippage hardly occurs between the external tooth forming roller 30 and the work 2, and the processing proceeds in a state where the external tooth forming die 30 a is accurately positioned with respect to the work 2. In addition, in this example, as the form of the biting portion 34, an obtuse angled protrusion of 90 to 150 °, more specifically 100 to 120 °, and more specifically about 112 ° is adopted. However, the present invention is not limited to this, and any means may be used as long as it increases the contact resistance with the workpiece 2, such as sharp ridges, protrusions, irregularities, knurled eyes, and file eyes.

  Moreover, as shown in FIG. 5, the biting part 34 may not be provided in the taper part 33, but may be provided in the end surface of the external tooth shaping | molding die 30a. In this example, a chamfered portion 34 formed in an arc shape is provided on the end surface of the external tooth forming die 30a. Further, even when the external tooth forming roller 30 is not provided with the taper portion 33, the biting portion 34 having an appropriate form may be provided in a portion that starts to contact the workpiece 2, such as the tip surface of the external tooth forming die 30a.

  As described above, in the state in which the internal tooth forming die 20a of the mandrel 20 and the external tooth forming die 30a of the external tooth forming roller 30 are synchronized, the external tooth forming roller 30 is rotated and moved in the axial direction of the mandrel 20. The cylindrical portion 2b of the workpiece 2 is pressed and deformed by the mandrel 20 and the external tooth forming roller 30, and is in phase with the internal teeth following the internal tooth forming die 20a of the mandrel 20, as shown in FIG. Thus, the cup-shaped gear 3 is formed on the outer peripheral surface of which the external teeth following the external tooth forming die 30a of the external tooth forming roller 30 are formed. And although abbreviate | omits for details, after completion | finish of a series of processes, the external gear shaping | molding roller 30 moves so that it may space apart from the main axis | shaft 10 largely. In addition, the cup-shaped gear 3 that is externally fitted to the mandrel 20 is pushed out of the mandrel 20 by being pushed upward of the main shaft 10 by the operation of an extrusion device (not shown) assembled inside the main shaft 10. In the cup-shaped gear 3 molded in this way, the outer teeth are molded after the inner teeth are molded, so that the molding accuracy is excellent.

  As mentioned above, although the manufacturing method and manufacturing apparatus of a cup-shaped gearwheel, and an example of the external gear forming roller concerning the present invention were explained in detail, the present invention is not restricted to this, and in the range which does not deviate from the gist of the present invention, Appropriate changes are possible. For example, the external tooth forming roller 30 only needs to move in the axial direction of the mandrel 20 while rotating and press and deform the work 2 with the mandrel 20. Approaching from the direction, it begins to contact a part of the peripheral surface of the work 2, that is, a part of the cylindrical part 2b of the work 2, and the inner teeth and the outer teeth are formed on a part of the cylindrical part 2b. After a part of the workpiece 2 is pressed and deformed in the radial direction, the workpiece 2 is moved in the axial direction of the mandrel 20 to form the inner teeth and the outer teeth over the entire length of the cylindrical portion 2b of the workpiece 2. Good.

It is the schematic which shows an example of the manufacturing apparatus of a cup-shaped gearwheel. It is the schematic which shows the process of shape-processing a raw material to a cup-shaped workpiece | work. It is the schematic which shows the process of manufacturing a cup-shaped gearwheel from a cup-shaped workpiece | work. It is a perspective view which shows an example of an external tooth shaping | molding roller. It is a perspective view which shows another example of an external tooth shaping | molding roller. It is a cross-sectional top view which shows the state which shape | molded the cup-shaped gearwheel with the mandrel and the external gear shaping | molding roller.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Material 2 Workpiece 2a Flange part 2b Cylindrical part 3 Cup-shaped gear 10 Main shaft 11 Main shaft side gear (interlocking mechanism, mandrel side interlocking mechanism)
12 Spindle drive motor (mandrel drive motor)
13 Intermediate pulley 14 Timing belt 15 Detection device 16 Holding member 20 Mandrel 20a Internal tooth forming die 30 External tooth forming roller 30a External tooth forming die 31 External tooth forming roller side gear (interlocking mechanism, external tooth forming roller side interlocking mechanism)
32 Drive motor for external tooth forming roller 33 Tapered portion 34 Chamfered portion 40 Control device 50 Outline processing roller

Claims (2)

The outer peripheral surface has an external mold, and moves in the axial direction of the work while rotating relative to the cup-shaped work, and the outer peripheral surface of the work is pressed and deformed by the external tooth mold. An external tooth forming roller for forming external teeth on
A tapered portion on the tip side, which is the side that starts to contact the workpiece at the start of machining,
An external tooth forming roller comprising a protrusion, protrusion, unevenness, knurled or filed portion provided on the tapered portion, and a biting portion that bites the workpiece at the start of processing. The outer peripheral surface has an external mold, and moves in the axial direction of the work while rotating relative to the cup-shaped work, and the outer peripheral surface of the work is pressed and deformed by the external tooth mold. An external tooth forming roller for forming external teeth on
An external tooth forming roller, comprising a biting portion that is formed in an arc shape on an end surface of the external tooth forming die and bites into a workpiece when processing is started.

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