JP3245673B2 - Outer Diameter Rolling Combined Machining Equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an external diameter rolling combined machining apparatus which finishes the outer peripheral surface of a small-diameter cylinder of a stepped shaft and a chamfered surface of a tip of the cylinder with a rotary tool.

[0002]

2. Description of the Related Art Roller burnishing has been conventionally used as a method for efficiently and relatively highly mirror-finishing the outer diameter, that is, the outer peripheral surface of a metal such as an aluminum pipe, a steel pipe or a shaft pipe in a short time. In this method, the surface of the workpiece is rolled with a roller to give it a slight plastic deformation, and the surface is mirror-finished to reduce sliding resistance and improve corrosion resistance. It is often used because it has many advantages, such as improvement of fatigue strength, improvement of fatigue strength due to generation of compressive residual stress near the surface, and possibility of dimensional modification by small deformation.

[0003] Roller burnishing uses tools of various shapes corresponding to various types of machined surfaces. Generally, a tool roller is mechanically pressed against the machined surface while the machine roller is pressed against the machined surface. Processing is performed by moving up. That is, the tool is rotationally driven and propulsion driven with respect to the workpiece,
Roller burnishing is performed in a desired range while changing the processing position.

[0004] As a device for finishing the outer surface of a relatively long column, cylinder, or the like, there is a device described in Japanese Utility Model Publication No. 7-15723. In this device, a plurality of tool rollers are arranged in contact with the inner peripheral surface of a cylindrical tool head, and the tool rollers are arranged.
The rar is rotatably locked to the frame, and is disposed at a predetermined angle with respect to the axis of the frame.
When the frame is rotated, the tool roller spirals on the outer peripheral surface of the workpiece while rotating. The tool roller is constrained by a groove in the frame, and the frame is rotatably fixed to the cylindrical member so as not to move in the axial direction, so that the workpiece is relatively sent in the axial direction. Will be.

That is, when a rotational torque is applied to the frame, a part of the rotational driving force becomes a feed force, so that another power for feeding and driving the workpiece is not required. Since a feed force is generated by the machining operation, it means that the workpiece does not require a rotation holding unit (chuck) other than the tool roller.

Further, the tool head has a taper on the inner peripheral surface, and the diameter of the taper decreases as it goes deeper. This side surface of a substantially cylindrical tool roller having a tapered side surface opposite to the taper of the tool head is in close contact with the inner peripheral surface of the tool head and moves in the axial direction integrally with the frame. Mounted as possible. Therefore, the tool diameter can be set corresponding to the outer diameter of the workpiece by moving and adjusting the frame in the axial direction.

As an apparatus for efficiently mirror-finishing the outer peripheral surface of a small-diameter-side column of a stepped shaft, Japanese Utility Model Application Laid-Open No. 4-1556.
There is No. 6. In the case of the roller burnishing device with the reversing mechanism of the embodiment shown in this issue, the tool diameter is set by moving and adjusting the tool head in the axial direction instead of the frame. This device is capable of processing the outer peripheral surface of the small diameter side cylinder of the stepped shaft, and after finishing the processing operation, inverts the frame before the large diameter side cylinder of the stepped shaft hits the entrance of the device to turn the workpiece. Discharge to the inlet side of the device.

[0008]

When the tapered chamfered surface or the R-shaped chamfered surface is formed at the tip of the small diameter side of the stepped shaft, the outer diameter rolling machine with the reversing mechanism is used. After machining the outer peripheral surface of the small-diameter side cylinder of the shaft with a taper, as another process, the machining surface of the tapered chamfered portion or the R-shaped chamfered portion is machined by another dedicated rolling machine. Since the roller burnishing device with the reverse rotation mechanism does not require a rotation holding unit other than the tool roller of the workpiece, it is a highly productive device, but a processing unit having a different shape is formed on the same workpiece. In some cases, processing had to be performed in a separate step using another dedicated rolling device, and overall productivity did not increase.

When machining the outer peripheral surface of the small diameter side cylinder of the stepped shaft, there is no need for chucking since the tool roller holds, feeds, and processes the workpiece. Therefore, the processing could be performed with high efficiency by using the roller burnishing device with the reversing mechanism. However, when processing the tapered chamfered surface or the R-shaped chamfered surface next time, it is necessary to chuck the workpiece for holding and feeding the workpiece because a normal rolling machine is used. The workability and productivity were relatively low.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and includes a rolling compaction machining of the outer peripheral surface of a small-diameter-side column of a stepped shaft and a machining surface of a tapered chamfer or an R-shaped chamfer. It is an object of the present invention to provide an external diameter rolling combined machining apparatus capable of performing rolling in a process and requiring no chucking.

[0011]

According to a first aspect of the present invention, there is provided an outer diameter compaction device for a cylindrical workpiece having a tapered or round chamfer at a tip end. An outer diameter rolling combined machining apparatus for rolling an outer peripheral surface, wherein a plurality of first tool rollers for rolling and rolling in contact with the outer peripheral surface of the cylindrical portion, and in contact with the outer peripheral surface of the chamfered portion. A plurality of second tool rollers for rolling, a tool head having a tapered inner peripheral surface that forms a guide surface for the first tool roller and the second tool roller, and a coaxial inner periphery of the tool head. The first tool roller and the second tool roller are fitted and locked, and a frame having a hollow portion into which the workpiece can be inserted, and the tool head and the frame are relatively positioned. Driving means for rotating, and the axial position of the workpiece To detection means for output, and control means for reversing the direction of movement of the workpiece on the basis of the output of the detection means, comprising the

According to a second aspect of the present invention, there is provided an outer diameter rolling machine according to the first aspect, wherein the first tool roller and the second tool are provided. Rollers are evenly and alternately arranged in the outer peripheral direction of the workpiece, and the first tool roller has a frusto-conical shape, and contacts the outer peripheral surface of the cylindrical portion at a side surface thereof, and the workpiece is The processing surface of the second tool roller, which is arranged to be inclined at a predetermined angle with respect to the center axis of the workpiece and is in contact with the outer peripheral surface of the chamfered portion, is a processing side surface of the first tool roller in the axial direction of the workpiece. The first tool roller is disposed between the front end and the rear end of the portion and is located inside the processing side surface of the first tool roller in the radial direction of the workpiece.

According to a third aspect of the present invention, there is provided an external diameter compaction apparatus according to any one of the first to second aspects, wherein the first tool roller is provided. Is approximately 1/2 of the taper angle of the inner peripheral surface of the tool head.
Has a taper angle of which a side surface portion is in contact with a tapered inner peripheral surface of the tool head and an outer peripheral surface of the columnar portion, and the introduction side of the workpiece is a frustoconical shape having a large diameter side. The second tool roller has a frusto-conical shape in which the introduction side of the workpiece is a small-diameter side, and further has a constricted portion at an intermediate portion of the side surface, and both end portions of the side surface are the tool head. The tapered inner peripheral surface is in contact with the constricted portion is disposed so as to contact the outer peripheral surface of the chamfered portion, between the tool head and an outer cylindrical member disposed outside the tool head. A tool diameter adjusting member fixed to the tool head and screwed to the outer cylinder member is interposed.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A portion to be processed of a workpiece to be rotary-processed by an outer diameter rolling and rolling combined machining apparatus according to the present invention has a columnar portion, and a tip portion of the columnar portion is formed in a previous stage. It is tapered and chamfered by a normal lathe. The tip portion may be tapered by a lathe or the like. When the tip is tapered into an R shape or the like, the portion becomes a rotating body having a cross-sectional curve. A plurality of first tool rollers are in contact with the outer peripheral surface of the cylindrical portion of the workpiece while rotating, and perform rolling compaction. The plurality of second tool rollers rotate and contact the outer peripheral surface of the tapered chamfered portion or the R-shaped chamfered portion at the tip end of the workpiece to perform outer diameter rolling.

Furthermore, the present invention can be implemented in the following modes. A first tool roller and a second tool roller,
As shown in FIGS. 2 and 3, they are arranged evenly and alternately in the circumferential direction. The first tool roller is formed into a frusto-conical shape, and is brought into contact with the workpiece on the side surface thereof. As shown in FIG. 4, the first tool roller is disposed at an angle θ with respect to the center axis of the workpiece, and rotates around its own center axis clockwise as viewed from the right in FIG. However, the workpiece is stationary without moving in the axial direction of the workpiece. Therefore, the first
When the tool roller performs only rotation as described above (hereinafter referred to as case 2), the workpiece moves rightward (inside the apparatus) while rotating counterclockwise when viewed from the right in FIG. . In the case where the first tool roller not only rotates as described above, but also revolves around the center axis of the workpiece (hereinafter referred to as Case 1), the workpiece is not shown in FIG.
Move to the right at.

The second tool roller has a machined surface disposed between a front end (workpiece introduction side) and a rear end of a machined side surface of the first tool roller in the axial direction of the work piece. The first tool roller is disposed inside a processing side surface of the first tool roller in a radial direction of the processing portion. Therefore,
The workpiece is first bitten by the first tool roller and moves toward the inside of the apparatus while the outer peripheral surface of the cylindrical portion is being processed, and then the outer peripheral surface of the tapered chamfered portion at the tip thereof. Alternatively, the outer peripheral surface of the rounded chamfered portion comes into contact with the processing surface of the second tool roller to be processed. While the second tool roller is rolling the workpiece, the first tool roller is also rolling. After the workpiece has contacted the second tool roller, the workpiece cannot proceed further, and the feed force of the first tool roller acts as a pressing force against the second processing roller. . Detecting means detects the axial position of the workpiece when the chamfered portion, which is the tip of the workpiece, comes into contact with the second tool roller, and based on the output of the detecting means, determines the moving direction of the workpiece. Invert. The mechanism for reversing the moving direction will be described later. The shape of the chamfered portion is not limited to the round shape, but may be any curved shape capable of rolling.

Further, the present invention may be implemented in the following mode. An external diameter rolling combined machining apparatus includes a tool head arranged to surround a workpiece. The tool head has a hollow portion whose inner peripheral surface is tapered, and has a structure in which a workpiece is introduced into the hollow portion. The frame has the same longitudinal central axis as the tool head and the workpiece, and is located inside the hollow portion of the tool head and outside the workpiece. The frame has a roller groove for rotatably fitting and locking the first tool roller and the second tool roller. The frame is cylindrical and has a hollow portion, and the workpiece is introduced into the hollow portion and is processed by rotation of the first tool roller and the second tool roller.

The first tool roller has a frusto-conical shape,
The side surface contacts the tapered inner peripheral surface of the tool head,
The side surface on the opposite side of the contact portion by 180 degrees contacts the outer peripheral surface of the cylindrical portion of the workpiece. The taper angle of the first tool roller is approximately の of the taper angle of the tool head. Also,
Since the first tool roller is disposed such that the introduction side of the workpiece is on the large diameter side, the contact surface of the first tool roller with the workpiece is horizontally disposed, and the cylindrical shape of the workpiece is obtained. The part can be contacted. As described above, the first tool roller has an angle θ with respect to the center axis of the workpiece as shown in FIG.
In this state, the taper angle of the first tool roller is determined such that the contact surface with the workpiece becomes horizontal in this state.

The second tool roller has a cylindrical or frusto-conical shape having a constricted portion at an intermediate portion of the side surface. In the case of the frusto-conical shape, the introduction side of the workpiece is the small diameter side. The second tool roller contacts the tapered inner peripheral surface of the tool head at both end portions of the side surface excluding the intermediate constriction portion of the side surface, and the intermediate constriction portion is processed at an angle opposite to the contact portion by 180 degrees. It comes into contact with the outer peripheral surface of the tapered portion at the tip of the object. The intermediate constricted portion, which is not processed with the tapered chamfered portion at the tip end of the workpiece, and both end side surfaces have a structure that does not interfere with or contact the cylindrical outer peripheral portion of the workpiece. In the case of the second tool roller having a frusto-conical shape and the introduction side of the workpiece is on the large diameter side, if the taper angle is equal to or less than a predetermined value, this structure can be adopted and used. It is possible.

An outer cylinder member is provided outside the tool head, and a tool diameter adjusting member is provided between the tool head and the outer cylinder member. The inner peripheral surface of the outer cylinder member is threaded, and the outer peripheral surface is threadedly connected to the tool diameter adjusting member having the threaded portion at the both threaded portions. The tool diameter adjusting member is fixed to the tool head. The outer peripheral surface of the tool head may be machined with a screw, and the inner peripheral surface of the tool diameter adjusting member may be machined with a screw.

Since the outer cylinder member and the tool diameter adjusting member are screwed together, the relative position between them in the longitudinal direction can be adjusted by rotating the tool diameter adjusting member. By adjusting the relative position of the tool diameter adjusting member with respect to the outer cylinder member, it is possible to adjust the relative position of the tool head and the outer cylinder member connected to the tool diameter adjusting member. That is, by rotating the tool diameter adjusting member, the tool head can be moved in and out of the outer cylinder member in the longitudinal direction.

Since the frame is fixed to the outer cylinder member in the longitudinal direction, if the tool head moves in and out of the outer cylinder member in the longitudinal direction, the tool head moves in and out of the frame in the longitudinal direction. . If the positional relationship between the tool head and the frame in the longitudinal direction changes, the positions at which the first tool roller and the second tool roller contact the inner peripheral taper portion of the tool head are changed, and the workpiece of the tool roller is changed. It is possible to finely adjust the contact diameter, that is, the tool diameter, and adjust and set the tool diameter according to the diameter of the workpiece. The setting of the tool diameter is performed before machining.

To prevent the tool diameter from changing during the machining operation,
That is, a fixing nut is attached to an outer peripheral thread portion of the tool adjusting member in order to prevent the coupling position between the outer cylinder member and the tool diameter adjusting member from changing. Also, the tool diameter can be set by sandwiching an adjusting ring between the fixed nut and the tool diameter adjusting member.

In case 1 (when the first tool roller rotates and revolves around the workpiece at the same time), the frame is driven to rotate around the central axis of the workpiece, and the outer cylinder member rotates. Fixed to disable. At this time, the tool diameter adjusting member and the tool head are also fixed non-rotatably. As the frame rotates, the tool rollers revolve around the workpiece while rotating at the same time. Normally,
A pulley is attached to the frame, and the frame is driven by a motor or the like via a timing belt or a V-belt. A flange is attached to the outer cylinder member, and the flange is attached to the device frame and fixed non-rotatably by the flange. The device is fixed to a surface plate or the like.

In case 2 (when the first tool roller performs only rotation and does not revolve around the workpiece), the tool head is driven to rotate about the center axis of the workpiece, and the frame does not rotate. Since the tool head rotates and the frame does not rotate, the tool roller only rotates and does not revolve around the workpiece. Since the tool head rotates, the tool diameter adjusting member and the outer cylinder member to which the tool head is fixed also rotate integrally. To achieve this, usually
A pulley is attached to the outer cylinder member, and the outer cylinder member is driven by a motor or the like via a timing belt or a V-belt, so that the tool diameter adjusting member and the tool head rotate. An apparatus housing is disposed outside the outer cylinder member via a bearing, and the apparatus housing is fixed to a surface plate or the like. The frame is fixed to the device housing. Therefore, even if the tool head rotates, the frame does not rotate.

The external diameter rolling combined machining apparatus of the present invention includes a detecting means for detecting an axial position of a workpiece. The workpiece is introduced into the external-diameter rolling combined machining apparatus, is bitten by the first tool roller, and is further drawn into the apparatus by the feed force of the first tool roller. Is set so that the detection means generates an output at the same time. Based on the output of the detecting means, the moving direction of the workpiece is reversed by the control means provided in the apparatus. Reversing the moving direction of the workpiece is case 1
In the case of, the direction of movement of the workpiece is reversed by reversing the direction of rotation of the electric motor in order to reverse the direction of rotation of the frame. In case 2, the rotation direction of the electric motor is reversed to reverse the rotation direction of the tool head.

A structure in which a detection rod is disposed inside the frame, and the workpiece introduced into the apparatus hits the detection rod, and moves the detection rod when the workpiece moves inside the frame toward the back. Good. At the same time that the tip of the workpiece hits the second tool roller, the detection rod may activate a limit switch attached to the outside of the frame to be turned on, and the motor may be reversed by a signal from the limit switch. In this case, there is a time delay from when the workpiece hits the second tool roller, that is, after the detection rod operates the limit switch and before the electric motor actually reverses. Rolling of the outer peripheral surface of the tapered portion at the tip of the workpiece is performed by the tool roller.

[0028]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of an external diameter rolling combined machining apparatus according to the present invention.

FIG. 1 shows an outer diameter rolling combined machining apparatus 1 according to an embodiment.
FIG. Here, the stepped shaft 2 which is the workpiece
Cylindrical processing surface 2A and its rounded tip chamfering surface 2
The cross section of the external diameter rolling combined machining apparatus 1 for machining B is shown together with the stepped shaft 2.

In FIG. 1, the tool head 3 has a tapered through hole 4 whose tip is wide and its back side is gradually narrowed. The first tool roller 8 and the first tool roller 8 rotatably fitted and locked inside the first roller groove 6 and the second roller groove 7 formed in the frame 5 on the inner peripheral surface of the through hole 4. Two tool rollers 9 are arranged in close contact. As shown in FIG. 2, the first tool rollers 8 and the second tool rollers 9 are arranged uniformly and alternately at an angular interval of 60 degrees in the outer peripheral direction of the frame 5.

As shown in FIG. 3, the first tool roller 8 has a frusto-conical shape having a tapered side surface, and the tapered side surface contacts the inner peripheral surface of the through hole 4. The taper angle of the first tool roller 8 is substantially half the taper angle of the inner peripheral surface of the tool head 3.
When one side of the tapered shape contacts the inner peripheral surface of the tool head, the side opposite to the side by 180 degrees is tapered so as to contact in parallel with the cylindrical processing surface 2A of the stepped shaft 2 which is the workpiece. Determine the angle. Therefore, the contact side surface of the first tool roller 8 with the workpiece forms the side surface of the virtual cylinder. The diameter of the circle at the bottom of this virtual cylinder is the diameter of the tool diameter.

As shown in FIG. 5, the second tool roller 9 has a frusto-conical shape having a tapered portion and a constricted portion including an R portion at an intermediate portion of the side surface, and the introduction side of the workpiece is the small diameter side. . The front end taper portion 9A and the rear end taper portion 9B are arranged so as to contact the inner peripheral surface of the through hole 4. Since the constricted tapered portion 9C is arranged so that the insertion side of the stepped shaft 2 forms the side surface of the virtual frustoconical cone having the large diameter side, it does not contact the cylindrical processing surface 2A of the stepped shaft 2. The constricted R portion 9D is formed so as to be in close contact with the R-shaped tip chamfered surface 2B of the stepped shaft 2. Since the tip tapered portion 9A is also arranged so that the insertion side of the stepped shaft 2 constitutes the side surface of the virtual frustoconical cone having the larger diameter side, it does not contact the cylindrical processing surface 2A of the stepped shaft 2.

As shown in FIG. 4, the first tool roller 8
Are arranged at an angle θ with respect to the longitudinal axis of the stepped shaft 2. In consideration of this arrangement, the taper angle of the first tool roller 8 is determined so that the contact surface of the first tool roller 8 with the cylindrical processing surface 2A is parallel. Frame 5
FIG. 4 shows the longitudinal axis of the stepped shaft 2 as a center.
Turn clockwise as viewed from the right. Therefore, the first tool roller 8 revolves around the stepped shaft 2 in this direction, and at the same time, rotates around its own central axis in this direction. Stepped shaft 2
As seen from FIG. 4, the first tool roller 8 makes a spiral movement as shown in FIG. The first tool roller 8 is structurally restrained in the longitudinal direction of the stepped shaft 2. Therefore, the stepped shaft 2 moves from left to right while rotating counterclockwise as viewed from the right in FIG. After the stepped shaft 2 is bitten by the first tool roller 8, the cylindrical processing surface 2 </ b> A is subjected to rolling by the first tool roller 8 while the feed force of the first tool roller 8 feeds the inside of the apparatus. Sent to. Therefore, it is not necessary to restrain the stepped shaft 2 with a chuck in order to rotate and feed the stepped shaft 2.

As shown in FIG. 3, the second tool roller 9 has a constricted R portion 9D which is a processing surface thereof, and the first tool roller 8
Is located slightly deeper in the apparatus 1 than the center of the processing surface of the first tool roller 8, and is located closer to the radial center axis of the stepped shaft 2 than the processing surface of the first tool roller 8. Therefore, the stepped shaft 2 bitten by the first tool roller 8 moves to the inner side of the device 1 and its front chamfered surface 2B comes into contact with the constricted R portion 9D of the second tool roller 9. Even after the contact, the feed force acts on the stepped shaft 2, but the constricted R portion 9D prevents the stepped shaft 2 from moving in the longitudinal direction. This feed force acts as a pressing force for pressing the stepped shaft 2 against the second tool roller 9, and enables the constricted R portion 9D of the second tool roller 9 to roll the tip chamfering portion 2B. I have.

The shape of the chamfered portion does not necessarily have to be an R shape, but may be a tapered shape or a curved shape other than an arc. However, the rotating body must have a shape that gradually becomes thinner toward the tip and has the same central axis as the cylindrical portion.

The frame 5 for fitting and locking the first tool roller 8 and the second tool roller 9 is disposed inside the through hole 4 of the tool head 3 with the same central axis as the tool head 3. I have. The frame 5 has a hollow portion, and the tool rollers 8 and 9 are arranged at the front end side from the center portion. However, the frame 5 has a flange portion at the rear end side (back side of the apparatus) from the center portion. The frame 5 is fixed to a frame stem 5A having a hollow portion and having the same central axis through a bolt at the flange portion. The frame stem 5A is a frame spring 5
It is attached to the frame drive shaft 5C via B. The frame drive shaft 5C has the same central axis as the frame 5 and has a hollow portion. The frame stem 5A includes a frame drive shaft 5
C is arranged to surround the frame 5 side. The frame spring 5B is housed in a cylindrical cavity formed between the frame stem 5A and the frame drive shaft 5C. The frame stem 5A cannot move because it abuts on the frame drive shaft 5C in the depth direction of the tool head 3, but can move in the opposite direction against the repulsive force of the frame spring 5B.

Frame stem 5A of frame drive shaft 5C
A driven pulley 10 for a timing belt for driving the frame 5 is attached to a shaft end in a direction opposite to the above, and a timing belt 13 is attached to a driven pulley 12 attached to an output shaft of a motor 11. ing.

On the other hand, the frame 5 and the frame drive shaft 5C
A detection rod 14 for detecting the processing limit position of the stepped shaft 2 which is loosely urged toward the stepped shaft insertion side and is movable in the axial direction is disposed on the center axis of the hollow portion. Detection rod 14
A detection tip 15 for detecting the axial position of the stepped shaft 2 is formed at the tip of the detection rod.
A cam head 16 is attached to the end opposite to 5. When the stepped shaft 2 comes to the processing limit position, that is, the chamfered processing surface 2B at the tip of the stepped shaft 2 is
The limit switch 17 is attached so that the cam head 16 activates the limit switch 17 when it comes into contact with the constricted R portion 9D. Limit switch 1
7 operates to turn on the limit switch 17. The output of the limit switch 17 is connected to a control circuit 18, and the output of the motor 11 is controlled according to the output of the control circuit 18.
Can be switched between normal rotation and reverse rotation. That is, the prime mover 11 is rotating forward until the limit switch 17 operates,
After the limit switch 17 is operated, a control circuit 18 is arranged so that the prime mover 11 rotates in the reverse direction.

When the motor 11 rotates in the reverse direction, the frame 5 rotates in the reverse direction, and the tool rollers 8 and 9 rotate in the reverse direction. The reverse rotation of the first tool roller 8 causes the stepped shaft 2 to reverse the moving direction. That is, since the first tool roller 8 generates a reverse feed force toward the insertion side of the device 1, the stepped shaft 2 moves toward the insertion side. Simultaneously with the reverse rotation of the frame 5, the constricted R portion 9D of the second tool roller 9 is moved to the stepped shaft 2
The contact with the front end chamfered portion 2B is stopped to separate, and the rolling in this portion is completed.

The cam head 16 operates the limit switch 17 when the chamfered surface 2B at the tip of the stepped shaft 2 comes into contact with the constricted portion 9D of the second tool roller 9. There is a time delay from the contact of the chamfered surface 2B at the tip with the constriction R portion 9D of the second tool roller 9 to the reverse rotation of the motor 11, so that the constriction of the second tool roller 9 during this time delay. Tip chamfering part 2B by R part 9D
Is carried out. If necessary, a timer may be operated after the limit switch 17 is operated, and a further time delay may be provided before the prime mover reverses. When the prime mover reverses and the stepped shaft 2 reverses the movement, the limit switch 17 changes from ON to OFF.
The prime mover 11 continues to rotate reversely until the stepped shaft 2 is disengaged from the first tool roller 8. The cam head 16
Can be set at a predetermined position according to the shape of the workpiece.

Further, a limit switch is mounted so that the cam head 16 of the detection rod 14 activates the limit switch immediately before the cylindrical processing surface 2A of the stepped shaft 2 comes into contact with the first tool roller 8. May be turned on to start the forward rotation of the prime mover 11, and the limit switch may be turned off to stop the reverse rotation of the prime mover 11.

The tool diameter adjusting member 19 is provided outside the tool head 3.
Are fixed to the tool head 3 and are arranged so as to surround the rear end of the frame 5 where the flange portion is located and the frame stem 5A. The tool diameter adjusting member 19 has an externally threaded portion on its outer peripheral portion. An outer cylindrical member 20 having an inner threaded portion meshing with the outer threaded portion on the inner peripheral surface is disposed so as to surround the tool diameter adjusting member 19 at the tip end. The outer cylinder member 20 further has a rear end
The frame drive shaft 5C is rotatably fixed via a thrust bearing 21 and a radial bearing 22 so as to surround the frame drive shaft 5C.

Since the outer cylinder member 20 and the tool diameter adjusting member 19 are screwed together, the tool diameter adjusting member 19 is rotated around the longitudinal axis so that the tool diameter adjusting member 19 is moved in and out of the outer cylinder member 20. be able to. Therefore, since the tool diameter adjusting member 19 is fixed to the tool head 3, the tool head 3 can be moved in and out of the outer cylinder member 20. Further, the movement of the frame 5 in the depth direction of the apparatus 1 is restricted by the frame drive shaft 5C and the thrust bearing 21. Therefore, the tool head 3 can be moved in and out of the frame 5 by rotating the tool diameter adjusting member 19. Thereby, the first tool roller 8 and the second
Tool roller 9 can be slid along the inner peripheral tapered surface of the tool head 3, and as a result, a fine adjustment setting of the tool diameter can be performed. Adjustment and setting of the tool diameter are performed before the start of rolling compaction.

As described above, the frame stem 5A
Is the frame drive shaft 5C in the direction of the back side of the tool head 3.
, But cannot move, but can move in the opposite direction against the repulsive force of the frame spring 5B. Further, the first tool roller 8 rolling on the tapered inner peripheral surface of the tool head automatically feeds the stepped shaft 2 toward the back side of the apparatus 1 by the feed inclination angle θ. Frame stem 5 if
A is urged to the back of the device 1. However, conversely, when the stepped shaft 2 is automatically fed toward the device 1 insertion side of the device 1, the frame stem 5 </ b> A is urged toward the device 1 insertion side.

When the prime mover 11 rotates forward and the stepped shaft 2 is automatically fed toward the back of the apparatus, the frame stem 5A abuts against the frame drive shaft 5C and the first tool While maintaining the tool diameter of the roller 8, the cylindrical processing surface 2A of the stepped shaft 2 is subjected to rolling processing, and further, the tip chamfering processing section 2B is subjected to rolling processing. However, when the motor 11 reverses and the stepped shaft 2 reverses the moving direction and is discharged to the insertion side of the device 1, the frame spring 5 </ b> B is compressed, and the first spring on the inner peripheral tapered surface of the tool head 3 is compressed.
The contact position of the tool roller 8 and the second tool roller 9 is shifted along the inner peripheral surface of the tool head 3 from the back side of the apparatus to the insertion side so that the first tool roller 8 and the second tool roller 9 face each other. Increase the spacing and increase the tool diameter. As a result, when the stepped shaft 2 is discharged, the first tool roller 8 and the second tool roller 9 are retreated and burnishing is not performed, and the first tool roller 8 is placed on the cylindrical processing surface 2A of the stepped shaft 2. No spiral scratches due to the small-diameter end portion of 8 and no rotational scratches due to the constricted R portion 9D of the second tool roller 9 on the tip chamfering surface 2B.

The leading end of the first tool roller 8 on the workpiece introduction side has an R shape with a large radius of curvature in order to make smooth contact with the stepped shaft 2. Strictly speaking, the taper angle of the first tool roller 8 is slightly larger than の of the taper angle of the inner peripheral surface of the tool head 3. Has a back taper in the insertion direction. That is, the tool diameter of the first tool roller 8 is minimum at the point where the R-shaped portion on the workpiece introduction side ends and shifts to the frustoconical portion, and the burnishing load is maximum at this portion. The tool diameter of the first tool roller 8 gradually increases from the tip side to the back side of the first tool roller 8 considering only the frusto-conical portion. Therefore, when the stepped shaft 2 is bitten by the first tool roller 8 and undergoes rolling work, the maximum value of the burnishing load is on the stepped shaft 2 from the tip end side of the stepped shaft 2 to the other end side. Will move towards it.

The first tool roller 8 is locked by the frame 5, and the innermost surface of the frame 5 hits the front end surface of the frame stem 5A so that it cannot be moved further back. I have. Therefore, the first tool roller 8 does not move from the introduction side to the back side along the inner peripheral surface of the tool head 3 due to the rolling.

[0048]

According to the outer diameter rolling combined machining apparatus of the present invention, in addition to the cylindrical machined surface of the workpiece, the tapered or rounded chamfered machined surface at the tip can be compacted in one machining step. It can be carried out. Therefore, the production efficiency can be increased, and a significant cost reduction can be achieved.

Further, according to the external diameter rolling combined machining apparatus of the present invention, a feed force can be applied to the workpiece by the tool roller, and thus the workpiece is held (chucking) for movement or rotation. Is unnecessary. Further, after the rolling, the workpiece can be automatically discharged to the insertion side. Therefore, the production efficiency can be further improved, and a significant cost reduction can be achieved. In addition, tool rollers for processing a cylindrical surface of a workpiece and tool rollers for processing a tapered surface at a tip and a curved surface at a tip are alternately arranged on the inner peripheral surface of a single tool head on a circle. Complex machined surfaces shorter than the roller length can be easily machined. Further, the structure of the tool (tool head, tool roller, frame) is simple, inexpensive, has a long service life, and can reduce both the initial cost and the operating cost.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an external diameter rolling combined machining apparatus according to an embodiment.

FIG. 2 is a cross-sectional view of a portion of the frame where a tool roller is provided.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a schematic view showing a movement of a first tool roller as viewed from a workpiece.

FIG. 5 is a sectional view taken along line BB of FIG. 2;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Outer diameter rolling combined machining apparatus 2 Stepped shaft 2A Cylindrical machining surface 2B Tip chamfering surface 3 Tool head 4 Through hole 5 Frame 5A Frame stem 5B Frame spring 5C Frame drive shaft 6 First roller groove 7 Second roller Groove 8 First tool roller 9 Second tool roller 9A Tip taper 9B Trailer taper 9C Neck taper 9D Neck R Cam head 17 Limit switch 18 Control circuit 19 Tool diameter adjusting member 20 Outer cylinder member 21 Thrust bearing 22 Radial bearing

Claims (3)

(57) [Claims] An outer diameter rolling combined machining apparatus for rolling an outer peripheral surface of a cylindrical workpiece having a tapered or rounded chamfered portion at a front end thereof, wherein the outer peripheral surface of the cylindrical portion is A plurality of first tool rollers that contact and compact by rolling; a plurality of second tool rollers that contact and compact by rolling on the outer peripheral surface of the chamfered portion; the first tool roller and the second A tool head having a tapered inner peripheral surface on which a guide surface of a tool roller is formed; coaxially disposed on an inner periphery of the tool head, engaging and locking the first tool roller and the second tool roller; A frame having a hollow portion into which the workpiece can be inserted, driving means for relatively rotating the tool head and the frame, and a chamfer of the workpiece contacting a second tool roller. /> detecting the axial position detection signal at the contact point And <br/> Ru detecting means to output the, and characterized by receiving a detection signal from the detecting means, and a control means for reversing the direction of movement of the workpiece based on the detection signal OD rolling combined machining equipment. 2. The first tool roller and the second tool roller are evenly and alternately arranged in an outer peripheral direction of the workpiece, and the first tool roller has a frusto-conical shape and has a side surface. In the portion, the processing surface of the second tool roller is in contact with the outer peripheral surface of the columnar portion, is disposed at a predetermined angle with respect to the center axis of the workpiece, and contacts the outer peripheral surface of the chamfered portion. Located between the front end and the rear end of the processing side surface of the first tool roller in the axial direction of the workpiece, and,
2. The first tool roller is disposed so as to be located inside a processing side surface portion of the first tool roller in a radial direction of the workpiece. 3.
Outer diameter rolling combined machining apparatus according to item 1. 3. The first tool roller has a taper angle of about １ ／ of a taper angle of an inner peripheral surface of the tool head,
The side surface portion is in contact with the tapered inner peripheral surface of the tool head and the outer peripheral surface of the columnar portion, and the introduction side of the workpiece has a frusto-conical shape with a large diameter side, and the second tool roller Has a frusto-conical shape in which the introduction side of the workpiece is the small diameter side, and further has a constricted portion in the middle portion of the side surface, and both end portions of the side surface are formed on the tapered inner peripheral surface of the tool head. And the constricted portion is disposed so as to contact an outer peripheral surface of the chamfered portion, and is fixed to the tool head between the tool head and an outer cylinder member provided outside the tool head, and A tool diameter adjusting member screw-coupled to the outer cylinder member was interposed.
An external diameter rolling combined machining apparatus according to claim 1.