JP6470167B2 - Screw rolling device - Google Patents

Description

  The present invention relates to a thread rolling device.

  Conventionally, a thread rolling device rotates a material to be processed and forms a screw on the surface of the material by a fixed rolling die, or fixes a material to be processed by a rotating rolling die that fixes and rotates the material to be processed. A method of forming a screw on the surface is used.

  The screw rolling device described in Patent Document 1 includes a rolling die, a die rotating shaft that attaches a rolling die to the tip, a rotation motor that rotates the die rotating shaft, a die rotating shaft, and a feed mechanism that sends the rotating motor in the axial direction. Is provided. The rolling die has a main hole penetrating back and forth on the axis, and with the end of the wire inserted into the main hole, the rolling die is rotated together with the die rotation shaft by the operation of the rotary motor, and a screw is attached to the surface of the wire. Roll. The screw rolling device described in Patent Document 1 is suitable for rolling a screw on a workpiece that is unsuitable for rotation, for example, because the wire is fixed.

JP-A-9-52138

  However, the screw rolling device described in Patent Document 1 has a problem that the size of the thread that can be rolled is limited because the range of the rotational speed of the rolling die is limited by the torque performance of the rotary motor.

  Moreover, since the rotary motor is sent to an axial direction with a die | dye rotating shaft, the screw rolling apparatus of patent document 1 cannot fix the signal supply line of a rotary motor. The wiring path of the signal supply line changes following the rotating motor that moves, and the signal supply line may be shaken with the movement of the rotary motor. If ripples are superimposed on the signal for motor control due to changes or fluctuations in the wiring path of the signal supply line, uneven rotation of the rolling dies will occur, and there is a possibility that the accuracy of the screws rolled to the material will deteriorate. There was also a problem that there was.

  Moreover, since the thread rolling apparatus described in Patent Document 1 is provided with a feeding mechanism below the rolling die, scraps peeled off from the wire during rolling or the lubricating liquid sprayed on the rolling die falls and feeds. There is also a problem that the accuracy of the feed drive of the die table is lowered due to adhesion to the mechanism.

  The present invention has been made in view of such circumstances, and an object of the present invention is to increase the range of the rotational speed of the rolling die and to increase the range of thread sizes that can be rolled. It is to provide a manufacturing apparatus.

A screw rolling device according to the present invention is provided with a rolling die attached to an end, a die rotating shaft having a central hole communicating with a main hole of the rolling die, and the die rotating shaft being rotatable about an axis. A screw rolling device comprising: a supporting die table; a rotary motor that generates a driving force for driving the die rotating shaft; and a feed mechanism that moves the die table in the axial direction of the die rotating shaft; The die rotation shaft is driven by the rotary motor via a speed change mechanism that varies the rotational speed of the die rotation shaft, and the speed change mechanism includes a plurality of input side gears coupled to the rotation motor, and the die a plurality of output-side gear mounted on the rotary shaft, the rotational speed by the set of the input side gear and said output gear is variable meshing with each other, the die table axis direction of the die rotary shaft The rotation motor is fixed to the base plate, the speed change mechanism has a spline shaft connected to the rotation motor, and the input side gear It is attached to a sleeve that is slidably supported by the spline shaft, and is supported by the die base so as to be rotatable about the axis of the spline shaft.

In the present invention, the range of the rotational speed of the rolling die attached to the die rotating shaft is widened by the speed change mechanism to widen the range of the screw size that can be rolled, and the rotary motor is fixed to the base plate. Therefore, the signal supply line of the rotary motor can be fixed.

  In the thread rolling device according to the present invention, the base plate is erected vertically, and the spline shaft is disposed above the die rotation shaft.

  In the present invention, since the base plate is erected vertically, the spline shaft of the speed change mechanism can be provided above the rolling die, and the feed mechanism can be provided on the side of the rolling die. Scraping from the material and contamination of the mechanism due to the fall of the lubricating liquid sprayed onto the rolling die are prevented.

According to the present invention, can range of the rotational speed of the rolling die attached to die roll rotating shaft is wider range of rolling possible thread size What Do extensively by the speed change mechanism, the rotation motor to the base plate Since the arrangement can be fixed, the signal supply line of the rotary motor can be fixed.

It is a perspective view which shows the external appearance of the screw rolling apparatus which concerns on Embodiment 1 of this invention. It is a perspective view which shows the external appearance of a rolling die part. It is a top view of a screw rolling device. It is a front view of a screw rolling device. It is a left view of a screw rolling device. It is a front view which shows the principal part of a rotation motor and a transmission mechanism. It is sectional drawing which shows the principal part of a die | dye rotating shaft. It is a schematic diagram for demonstrating the variation of the rotational speed by a transmission mechanism. It is a schematic diagram for demonstrating the variation of the rotational speed by a transmission mechanism. It is a perspective view which shows the external appearance of the screw rolling apparatus which concerns on the modification of this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a thread rolling device according to the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is a perspective view showing an external appearance of a thread rolling device 100 according to Embodiment 1 of the present invention. In the screw rolling device 100 according to the present invention, since a rolling die rotates around an axis to form a screw as a material to be processed, a screw for a processing object unsuitable for rotation, for example, a wire material subjected to bending processing or the like. Suitable for rolling. In the following description, a wire is taken as an example of the material to be processed, but the material to be processed is not limited to this.

  The screw rolling device 100 includes a gantry 1, a base plate 2, a feed mechanism 3, a die table 4, a rotary motor 5, a speed change mechanism 6, a die rotating shaft 7, and a rolling die 8. The gantry 1 connects a bottom portion 11 formed by welding rectangular pipes or the like in a rectangular shape, two struts 12a erected from the middle of two opposite sides of the bottom portion 11, and upper and lower portions of the strut 12a. The beams 13a and 13b, and the columns 12b standing upright in the middle of the beams 13a and 13b are provided.

  In addition, the gantry 1 has an upper portion 14 provided to face the bottom portion 11 so as to place the table 15 in the middle portion in the height direction of the columns 12a and 12b. By surrounding the periphery of the table 15 with the frame 16 or placing a tray on the table 15, it becomes a tray for debris peeled off from the wire during rolling, or a lubricating liquid sprayed on the rolling die 8. The gantry 1 has a clamp base 17 for holding a wire to be processed. The clamp table 17 is fixedly disposed at a position facing the rolling die 8 by an arm member extending from the frame 1. The clamp base 17 is fixed with a block formed with a groove into which the bent wire is fitted, and a block formed with a contact surface that comes into contact with the wire for positioning the wire. Note that the screw rolling device 100 is appropriately attached with a box-shaped cover that covers the entire device, and a part of the cover can be removed, thereby improving the efficiency of the screw rolling operation.

  The base plate 2 has a rectangular plate shape, is vertically fixed and fixed to the columns 12 a and 12 b, and is disposed on the upper side of the table 15. The base plate 2 is composed of, for example, four rectangular pipe members, each side of a rectangle, provided with reinforcing members that connect the middle portions of two opposite sides as appropriate to increase rigidity, and a flat plate on both sides. It can be formed by pasting by welding or the like. The long side of the base plate 2 is horizontal and the short side is vertical, and the main surface 2a of the base plate 2 faces the horizontal direction. On the main surface 2 a of the base plate 2, a feed mechanism 3, a die base 4, a rotary motor 5, a speed change mechanism 6, a die rotating shaft 7, and a rolling die 8 are arranged.

  FIG. 2 is a perspective view showing an appearance of the rolling die 8 portion. The rolling dies 8 are axially arranged in parallel with the main hole 8a into which the end portion of the wire is inserted at the front end portion and in parallel with the central axis direction of the main hole 8a, and are arranged in parallel at equal intervals on the circumference. It has three cylindrical rolls 81. The roll 81 is provided with a screw on a side surface. The wire inserted from the main hole 8 a of the rolling die 8 contacts the side surface of the roll 81. As the rolling die 8 rotates around the axis, the screw provided on the side surface of the roll 81 bites into the wire and forms a screw by plastic deformation on the surface of the wire.

  3 is a plan view of the thread rolling device 100, FIG. 4 is a front view of the thread rolling device 100, and FIG. 5 is a left side view of the thread rolling device 100. FIG. The feed mechanism 3 includes two sets of linear guides including a guide rail 31 and a block 32, a ball screw including a screw shaft 33 and a nut 34, and a feed motor 35. The two guide rails 31 are respectively provided on two horizontally extending support members 21 fixed to the base plate 2, and are spaced apart from each other in the vertical direction along the main surface 2 a of the base plate 2. Arranged so as to extend in the horizontal direction. Two blocks 32 are provided on each guide rail 31, and each block 32 is fitted to the guide rail 31 and is slidably supported by the guide rail 31. The die table 4 is attached to a total of four blocks 32 provided on the two guide rails 31.

  The screw shaft 33 is disposed at the center of the two guide rails 31 in parallel with the guide rail 31 and is supported by a bearing portion fixed to the base plate 2 so as to be rotatable around the axis. The nut 34 is attached to the die base 4 and is screwed to the screw shaft 33. The feed motor 35 is fixed to the base plate 2 via a bracket, and the rotation shaft is connected to one end of the screw shaft 33. The nut 34 is moved in the axial direction of the screw shaft 34 together with the die base 4 by rotating the screw shaft 33 around the axis by the feed motor 35.

  The die table 4 has a rectangular plate shape, and is vertically arranged on the upper side of the table 15. The main surface 4a of the die table 4 is parallel to the main surface 2a of the base plate 2 and faces the horizontal direction. The die table 4 is attached to the four blocks 32 of the feed mechanism 3 and can move in the horizontal direction along the guide rail 31 by the feed operation of the feed mechanism 3. The die table 4 supports the speed change mechanism 6, the die rotating shaft 7 and the rolling die 8 arranged on the main surface 4 a of the die table 4.

  The rotary motor 5 is fixed to the base plate 2 via a bracket 22. A rotating shaft of the rotary motor 5 is coupled to one end of a spline shaft 61 of the transmission mechanism 6 described later by a coupling 51. The signal supply line to the rotary motor 5 can be provided with a wiring path on the bracket 22, the base plate 2, and the mount 1 fixed to the base plate 2. The bracket 22, the base plate 2, the gantry 1, and the rotary motor 5 serving as a wiring path do not move during the rolling of screws. Therefore, the signal supply line to the rotary motor 5 is fixedly provided on the wiring path, so that the wiring path does not change during the rolling of the screw, and vibration is suppressed.

  The transmission mechanism 6 includes a spline shaft 61, input side gears 62 and 63, and output side gears 65 and 66. One end of the spline shaft 61 is connected to a coupling 51 attached to the rotation shaft of the rotary motor 5, and the other end is supported rotatably around the axis by a support portion 23 erected on the base plate 2. The axial direction of the spline shaft 61 is parallel to the axial directions of the guide rail 31 and the screw shaft 33 of the feed mechanism 3. The input side gears 62 and 63 are spur gears having different pitch circle diameters of the gears, and are inserted through the spline shaft 61.

  FIG. 6 is a front view showing the main parts of the rotary motor 5 and the speed change mechanism 6. Two sleeves 64 are inserted into the spline shaft 61, and input side gears 62 and 63 are attached to the main body portions of the sleeves 64. The housing portion of each of the sleeves 64 is attached to support portions 42 and 43 arranged on the die base 42. The input side gears 62 and 63 attached to the main body of each sleeve 64 rotate together with the spline shaft 61. Further, the input side gears 62 and 63 move in the axial direction on the spline shaft 61 together with the die base 4 that moves by the feed operation of the feed mechanism 3. The main body portion of the sleeve 64 is accommodated in the housing portion of the sleeve 64 via a bearing, is slidable with respect to the spline shaft 41, is restricted in rotation, and is rotatable with respect to the housing portion. is there.

  The support portion 42 and the support portion 43 have long holes 42 a and 43 a whose longitudinal direction is the axial direction of the spline shaft 61 at four locations on the bottom plate portion attached to the die base 4. The support portion 42 and the support portion 43 are attached to the die base 4 by passing a fastener such as a screw through the long hole 42 a and the long hole 43 a and screwing into a screw hole provided in the die base 4. The support portion 42 and the support portion 43 can be moved in the axial direction of the spline shaft 61 by an amount corresponding to the longitudinal dimension of the long hole 42a and the long hole 43a to change the mounting position on the die base 4.

  The output side gears 65 and 66 of the speed change mechanism 6 are spur gears having different pitch circle diameters, and are attached to the end of the die rotating shaft 7 opposite to the end where the rolling die 8 is mounted (FIG. 4). reference). The output side gear 65 is paired with the input side gear 62, and the output side gear 66 is paired with the input side gear 63. The pitch circle diameters of the input side gear 62 and the output side gear 65 shown in the figure are the same, and the rotation speeds of the rotary motor 5 and the die rotary shaft 7 are the same. On the other hand, the ratio of the pitch circle diameters of the input side gear 63 and the output side gear 66 is 2 to 1, and the die rotating shaft 7 can be rotated at a rotational speed twice that of the rotary motor 5.

  FIG. 7 is a cross-sectional view showing a main part of the die rotating shaft 7. The die rotation shaft 7 has a cylindrical shape, is supported via a bearing in a through hole of a support portion 44 disposed on the die table 4, and can rotate around an axis. The axis of the die rotation shaft 7 is parallel to the guide rail 31 and the screw shaft 33 of the feed mechanism 3 and the spline shaft 61 of the speed change mechanism 6. The die rotation shaft 7 is disposed below the spline shaft 61 and on the lateral sides of the guide rail 31 and the screw shaft 33 of the feed mechanism 3. As described above, the output side gears 65 and 66 of the speed change mechanism 6 are attached to the end of the die rotating shaft 7 opposite to the end where the rolling die 8 is mounted. The die rotating shaft 7 rotates around the axis along with the rotation of the output side gears 65 and 66.

  The die rotating shaft 7 has a frustoconical mounting hole 71 at the end where the rolling die 8 is mounted, and a center hole 72 penetrating from the end to the other end. The rolling die 8 has a diameter reduced toward the end, a truncated cone-shaped mounting portion 82 that fits in the mounting hole 71 of the die rotating shaft 7, and a cylinder that fits on the outer peripheral surface of the end of the die rotating shaft 7. A chuck 83 is provided. The rolling die 8 is attached coaxially to the die rotation shaft 7 by a cylindrical chuck 83, and the rotation around the axis is constrained by the die rotation shaft 7. The main hole 8 a of the rolling die 8 penetrates from the tip end side to the end face on the mounting portion 82 side and communicates with the center hole 72 of the die rotating shaft 7. When forming a long threaded portion, the end portion of the wire rod passes through the end surface of the mounting portion 82 from the main hole 8 a of the rolling die 8 and is inserted into the center hole 72 of the die rotating shaft 7.

  Next, the operation of the screw rolling device 100 will be described. The input side gear and the output side gear to be engaged with each other by the speed change mechanism 6 are set in accordance with the wire diameter of the wire rod formed on the shaft end. When the rotational speed of the die rotating shaft 7 is constant, when the wire diameter of the wire is small, the moving speed at which the contact portion of the roll 81 of the rolling die 8 that contacts the surface of the wire moves on the surface of the wire decreases. It is not possible to ensure the moving speed of the contact portion on the surface of the wire necessary for plastic deformation of the wire. For this reason, when the wire diameter of the wire is small, it is necessary to increase the rotation speed of the die rotation shaft 7. In this embodiment, the rotation speed of the die rotation shaft 7 is twice the rotation speed of the rotation motor 5. The input side gear 63 and the output side gear 66 are engaged with each other.

  FIG. 8 and FIG. 9 are schematic diagrams for explaining the change of the rotation speed by the speed change mechanism 6. FIG. 8 shows a setting state in which the input side gear 63 and the output side gear 66 are meshed to increase the rotational speed of the die rotating shaft 7 when the wire diameter of the wire is small. The input side gear 63 is disposed at a position where the attachment position of the support portion 43 to the die base 4 is moved in the axial direction of the spline shaft 61 through the long hole 43 a and meshes with the output side gear 66. On the other hand, the input side gear 62 is arranged at a position where the attachment position of the support portion 42 to the die base 4 is moved in the axial direction of the spline shaft 61 by the long hole 42 a and the meshing with the output side gear 65 is released.

  In the present embodiment, the ratio of the pitch circle diameters of the input side gear 63 and the output side gear 66 is 2: 1, and the die rotating shaft 7 can be rotated at a rotational speed twice that of the rotary motor 5. For example, when the maximum rated rotational speed of the rotary motor 5 is 2000 RPM (revolutions / minute), the rotational speed of the die rotating shaft 7 can be increased up to 4000 RPM, and the screw can be used even when the wire diameter of the wire is small. It is possible to secure the moving speed on the surface of the wire rod at the contact portion with the wire rod surface of the roll 81 that is necessary when rolling the wire.

  FIG. 9 shows a setting state in which the input side gear 62 and the output side gear 65 are meshed so that the rotational speed of the die rotating shaft 7 is equal to the rotational speed of the rotary motor 5 when the wire diameter of the wire is large. . The input side gear 62 is arranged at a position where the mounting position of the support portion 42 on the die base 4 is moved in the axial direction of the spline shaft 61 through the long hole 42 a and meshes with the output side gear 65. On the other hand, the input side gear 63 is arranged at a position where the attachment position of the support portion 43 to the die base 4 is moved in the axial direction of the spline shaft 61 by the long hole 43a and the meshing with the output side gear 66 is released.

  In the present embodiment, the input side gear 62 and the output side gear 65 have the same pitch circle diameter, and the die rotating shaft 7 can be rotated at the rotational speed of the rotary motor 5. For example, when the maximum rated rotation speed of the rotary motor 5 is 2000 RPM, the rotation speed of the die rotation shaft 7 can be rotated at a maximum of 2000 RPM. When the wire diameter of the wire is large, the moving speed of the contact portion with the wire surface of the roll 81 on the surface of the wire is higher than that when the wire diameter of the wire is small, and the contact portion necessary for screw rolling. Can be secured.

  After setting the input side gear and the output side gear to be engaged with each other by the speed change mechanism 6 according to the wire diameter of the wire, a holding block corresponding to the wire to be processed is fixed to the clamp base 17, and the wire is attached to the block. Hold. Next, the rotary motor 5 is rotated, and at the same time, the die base 4 is fed by the feed mechanism 3, the end of the wire to be processed is passed through the main hole 8 a of the rolling die 8, and the end is bitten by the roll 81. . The feed speed of the feed mechanism 3 corresponding to the rotational speed of the die rotating shaft 7 is set according to the pitch of the screw to be rolled onto the wire, and the die base 4 is fed to roll the screw onto the wire. When a long screw is formed on the wire, the wire passes through the end surface of the mounting portion 82 from the main hole 8 a of the rolling die 8 and is inserted into the center hole 72 of the die rotating shaft 7.

  After the die base 4 is fed by the feed mechanism 3 by the length of the screw to be rolled into the wire rod, the rotary motor 5 is rotated in the reverse direction, the feed speed of the feed mechanism 3 is reversed in the positive and negative directions, and the die base 4 is pulled back. The wire rod is pulled out from the main hole 8a of the rolling die 8, and the screw rolling is completed. In addition, the length of the screw to be rolled into the wire is allowed to a dimension that allows the feed mechanism 3 to feed the die table 4. Further, when a rolling die having a clutch mechanism for separating the roll 81 from the axis of the rolling die 8 is used, the clutch mechanism is actuated to release the biting of the roll 81 on the wire, and the feed mechanism 3 uses the die. The base 4 may be pulled back to pull out the wire from the main hole 8 a of the rolling die 8.

  As described above, according to the present embodiment, in the thread rolling device 100, the rolling die 8 is mounted on the end portion of the die rotating shaft 7 having the central hole 72 therethrough. The center hole 72 of the die rotating shaft 7 communicates with a main hole 8a that penetrates from the tip end side of the rolling die 8 to the end face on the mounting portion 82 side. The support portion 44 is disposed on the die base 4 and supports the die rotation shaft 7 so as to be rotatable around the axis. The rotation motor 5 generates a driving force for driving the die rotation shaft 7. The feed mechanism 3 moves the die table 4 in the axial direction of the die rotation shaft 7. The die rotating shaft 7 is driven by the rotary motor 5 via the speed change mechanism 6 that makes the rotation speed variable. In the screw rolling device 100, since the rotational speed of the die rotating shaft 7 is variable by the speed change mechanism 6, the range of the rotational speed of the rolling die 8 that rotates together with the die rotating shaft 7 is widened and can be rolled. The range of the wire diameter of the wire, that is, the thread size that can be rolled can be widened.

  Further, the thread rolling device 100 includes a plurality of input side gears 62 and 63 in which the speed change mechanism 6 is connected to the rotary motor 5 and an end portion opposite to an end portion on which the rolling die 8 of the die rotating shaft 7 is mounted. Output side gears 65 and 66 attached to the motor. The input side gear 62 is paired with the output side gear 65, and the input side gear 63 is paired with the output side gear 66. Since the thread rolling device 100 can be set in two stages: a setting in which the input side gear 62 and the output side gear 65 are engaged with each other by the speed change mechanism 6 and a setting in which the input side gear 63 and the output side gear 66 are engaged with each other. 8 becomes variable, and the range of the rotational speed of the rolling die 8 is widened.

  Further, the screw rolling device 100 includes a base plate 2 that supports the die table 4 so as to be movable in the axial direction of the die rotation shaft 7. The rotary motor 5 is fixed to the base plate 2 via a bracket 22. The spline shaft 61 of the speed change mechanism 6 is connected to the rotation shaft of the rotary motor 5 by a coupling 51. The input side gears 62 and 63 are attached to a sleeve 64 that is slidably supported by the spline shaft 61, and can be rotated around the axis of the spline shaft 61 by support portions 42 and 43 disposed on the die base 4. It is supported. Since the rotary motor 5 is fixed to the base plate 2, the screw rolling device 100 can be fixed by wiring the signal supply line of the rotary motor 5 on the bracket 22, the base plate 2 and the mount 1.

  In the thread rolling device 100, the base plate 2 is vertically installed and fixed to the gantry 1, and the spline shaft 61 is disposed above the die rotating shaft 7. In the screw rolling device 100, since the base plate 2 is erected vertically, the spline shaft 61 of the speed change mechanism 6 is positioned above the rolling die 8, and the feed mechanism 3 is lateral to the rolling die 8 in the horizontal direction. It is possible to prevent dirt from being peeled off from the wire during rolling or contamination of the mechanism due to the fall of the lubricating liquid sprayed onto the rolling die. The scraps peeled off from the wire during rolling and the lubricating liquid sprayed onto the rolling die 8 fall on the table 15 on the gantry 1 and can be easily recovered after rolling by placing a tray on the table 15, for example. .

(Modification)
In the first embodiment described above, the screw rolling device 100 stands upright with the base plate 2 fixed to the gantry 1, but the base plate 2 may be provided horizontally on the gantry 1. FIG. 10 is a perspective view showing the external appearance of the thread rolling device 100 according to a modification of the present invention. The configurations of the feed mechanism 3, the base base 4, the rotary motor 5, the speed change mechanism 6, the die rotating shaft 7, and the rolling die 8 and the arrangement on the base plate 2 are the same as those in the first embodiment. The structure and operation of each mechanism and component in the modification are the same as those in the first embodiment, and the description is omitted for the sake of brevity.

  Since the feed mechanism 3 is arranged below the rolling die 8 in the screw rolling device 100 shown in FIG. 10, the upper part of the feed mechanism 3 is preferably covered with a cover component formed of a thin plate material, and the wire rod is rolled during rolling. It is preferable to prevent dirt from being peeled off or contamination of the mechanism part due to the fall of the lubricating liquid sprayed onto the rolling die 8. Note that the spline shaft 61 of the speed change mechanism 6 is positioned on the side of the rolling die 8 in the horizontal direction.

  Since the structure of each mechanism and parts on the rolling die base 2 is the same as that of the first embodiment, the rotational speed of the die rolling shaft 7 is variable by the speed change mechanism 6 in the screw rolling device 100, and the die rotating shaft 7. Accordingly, the range of the rotational speed of the rolling die 8 that rotates together can be widened, and the wire diameter of the wire that can be rolled, that is, the range of the screw size that can be rolled can be widened. Further, since the rotary motor 5 is fixed to the base plate 2, the screw rolling device 100 can be fixed by wiring the signal supply line of the rotary motor 5 on the bracket 22, the base plate 2 and the mount 1. it can.

  Furthermore, the thread rolling device 100 does not need to extend the columns 12a and 12b of the gantry 1 shown in the first embodiment to the upper part of the device, but when a box-shaped cover that covers the entire device is attached, the height of the device is This is the same level as in the first embodiment. In the first embodiment, in order to prevent the apparatus from overturning, the columns 12a and 12b are erected in the middle of the opposite two sides of the bottom 11, and the bottom 11 protrudes to the back side of the columns 12a and 12b. In the thread rolling device 100 according to the modified example, the base plate 2 is horizontally arranged on the gantry 1, so that the stability of the device against overturning is improved, and the bottom 11 is stretched to the back side of the columns 12 a and 12 b. There is no need to configure it.

  In the first embodiment and the above-described modification, the screw rolling device 100 includes the speed change mechanism 6 that can change the rotational speed of the die rotating shaft 7 in two stages. You may make it the structure which makes a gear into 3 or more sets. By making the rotational speed of the die rotating shaft 7 variable in three or more stages, the rotational speed range of the die rotating shaft 7 can be further expanded, or the rotational speed of the die rotating shaft 7 can be set finely within a certain range. it can.

  In the first embodiment and the above-described modification, the speed change mechanism 6 is configured with spur gears for the input side gear and the output side gear, but similarly, a gear configuration in which the rotational speed of the die rotating shaft 7 is variable. It is also possible to change to.

  In the first embodiment and the above-described modification, the screw rolling device 100 uses a rolling die 8 in which a screw is rolled on a wire with three rolls 81 spaced from the axis. Other types of rolling dies may be used. In addition, the mounting portion 82 and the cylindrical chuck 83 for mounting the rolling die 8 on the die rotating shaft 7 may be formed using parts or parts based on other methods.

  Further, in the first embodiment and the above-described modification example, the wire rod is taken as an example of the processing target of the screw rolling device 100, but the processing target may be an axial one. Since the rolling die 8 rotates and rolls, the thread rolling device 100 is suitable for thread rolling with respect to a workpiece that is unsuitable for rotation, but is also used for thread rolling with respect to a workpiece that can be rotated satisfactorily. be able to.

  The present invention is not limited to the above-described embodiments, but covers the technical scope of the invention described in the claims and the equivalent scope thereof.

2 Base plate 3 Feed mechanism 4 Die base 5 Rotating motor 6 Transmission mechanism 61 Spline shaft 64 Sleeve 62, 63 Input side gear 65, 66 Output side gear 7 Die rotation shaft 72 Center hole 8 Rolling die 8a Main hole 100 Screw rolling apparatus

Claims (2)

A die rotating shaft having a center hole communicating with a main hole of the rolling die, a die base that rotatably supports the die rotating shaft around an axis, and the die rotating shaft. A screw rolling device comprising: a rotary motor that generates a driving force for driving the die base; and a feed mechanism that moves the die base in the axial direction of the die rotary shaft,
The die rotary shaft is driven by the rotary motor via a speed change mechanism that makes the rotational speed of the die rotary shaft variable .
The speed change mechanism has a plurality of input side gears connected to the rotary motor and a plurality of output side gears attached to the die rotation shaft, and is a combination of the input side gear and the output side gear that mesh with each other. The rotation speed is variable,
A base plate for supporting the die table movably in the axial direction of the die rotation axis;
The rotary motor is fixed to the base plate,
The speed change mechanism has a spline shaft connected to the rotary motor,
The input side gear is attached to a sleeve that is slidably supported by the spline shaft, and is supported by the die base so as to be rotatable around the axis of the spline shaft. apparatus. 2. The screw rolling device according to claim 1, wherein the base plate is erected vertically, and the spline shaft is disposed above the die rotation shaft .

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