JP5027080B2 - Work discharge method of shaft enlargement processing machine - Google Patents

Description

  The present invention relates to a shaft enlargement processing machine that forms an enlarged portion in which a workpiece of a shaft member is partially enlarged, and more particularly to a workpiece discharge method that discharges a workpiece from the shaft enlargement processing machine after processing the enlarged portion.

This type of shaft enlargement processing machine is disclosed in Patent Document 1, for example, and the processing machine of Patent Document 1 includes a pair of sleeve holders (holding cylinders). These sleeve holders are fitted and held at both ends of the work, and in this state, the work is applied with an axial compressive force and rotation around the axis, while one end of the work is held against the axis. Can be tilted.
When the compression force, rotation, and tilt described above are applied to the workpiece, an enlarged portion (collar) having a partially enlarged diameter is formed on the workpiece. The formation of the enlarged portion is completed when the workpiece tilt is restored and the pair of sleeve holders are again arranged on the workpiece axis, and then the processed workpiece is the pair of sleep holders of the processing machine. Discharged from.

  Here, when forming the enlarged portion described above on the workpiece, the workpiece is not enlarged only by the enlarged portion, but the end portion of the workpiece held in the sleeve holder is also enlarged. More specifically, since the end of the work is restrained from the outside in the radial direction by the sleeve holder in this enlargement, a tension output is given to the end of the work in the outside in the radial direction, and the above-described compression force is applied. Due to this, an elastic repulsive force in the axial direction is given. Therefore, the end portion of the workpiece is strongly coupled to the sleeve holder in a state having such tension output and elastic repulsion.

For this reason, when the work is discharged from the pair of sleeve holders, the work is forcibly pushed out from the sleeve holder to extract the work from the pair of sleeve holders, and the inner peripheral surface portion on the open end side of the sleeve holder. Is formed on a reverse taper surface that is slightly expanded in diameter toward the opening end, so that the workpiece can be easily extracted.
Specifically, the work is discharged according to the following procedure.

First, while separating one sleeve holder from the other sleeve holder, the workpiece is forcibly pushed out from the other sleeve holder. At this time, the workpiece is held by one of the sleeve holders. Thereafter, the workpiece is forcibly pushed out from the inside of the sleeve holder, and the workpiece is discharged from the processing machine.
Patent No. 3418698

As described above, since the enlargement of the end portion of the work is constrained by the sleeve holder, the end portion of the work is in a state in which the tension output to the outside in the radial direction and the elastic repulsion force in the axial direction are inherent.
For this reason, as described above, when the work is forcibly extracted from the one sleeve holder after the work is pulled out from the other sleeve holder, the tension output at the end of the work and the elastic repulsive force in the axial direction are rapidly reduced. If released, depending on the friction between the workpiece and the sleeve holder, the release of the elastic repulsion force may be in particular related to the fact that the reverse tapered surface described above is formed on the inner peripheral surface of the sleeve holder. As a result, the workpiece may jump out of the sleeve holder.

Such jumping out of the workpiece may cause an excessive load on the robot hand that carries the workpiece into and out of the processing machine, and may damage the robot hand.
The present invention has been made based on the above-described circumstances, and the object is to discharge the workpiece of the shaft enlargement processing machine that can reliably prevent the workpiece from popping out when the workpiece is discharged from the shaft enlargement processing machine. It is to provide a method.

  In order to achieve the above object, the present invention is a workpiece discharge method applied to the shaft enlargement processing machine including the pair of sleeve holders described above, and this workpiece discharge method is performed after the formation of the enlarged portion with respect to the workpiece is completed. While one sleeve holder is separated from the other sleeve holder in the axial direction among a pair of sleeve holders on the workpiece axis, one end of the workpiece in one sleeve holder is directed toward the other sleeve holder. After extruding and partially removing one end of the work from one sleeve holder, the other end of the work in the other sleeve holder is extruded toward the one sleeve holder, and into the one sleeve holder. Pull out the other end of the workpiece completely from the other sleeve holder while pushing in one end of the workpiece, and then push out one end of the workpiece. Open City, completely extract the end portion of the workpiece from one of the sleeve holder (claim 1).

Specifically, the workpiece is pushed out from the sleeve holder by an extrusion pin disposed coaxially in the sleeve holder (claim 2).
According to the work discharging method described above, the end of the work is partially extracted from the one sleeve holder by a predetermined length before the one end of the work is completely extracted from the one sleeve holder. Thus, the partial withdrawal here releases the tension output and elastic repulsion force inherent in one end of the workpiece. Therefore, after that, when one end of the work is completely extracted from one sleeve holder, the work does not jump out of the sleeve holder.

  When the other end of the work is completely removed from the other sleeve holder, the one end of the work is still held in the one sleeve holder. Even if the force is released, the release here does not cause the workpiece to pop out.

  The workpiece discharge method of the shaft enlargement processing machine according to claims 1 and 2 can reliably prevent the workpiece from popping out due to the tension output and elastic repulsion force inherent in the end of the workpiece when the workpiece is discharged. The workpiece can be discharged safely from

FIG. 1 shows an outline of a shaft enlargement processing machine.
The shaft enlargement processing machine includes a drive side sleeve holder 2 and a pressure side sleeve holder 4 as a pair of sleeve holders, and the sleeve holders 2 and 4 are arranged on the same reference line A. The drive side and pressure side sleeve holders 2 and 4 each have knockout pins 6 as push pins, and these knockout pins 6 are coaxially slidably disposed in the corresponding sleeve holders.

More specifically, the drive side sleeve holder 2 can be rotated around the reference line A and can be tilted with respect to the reference line A, while the pressure side sleeve holder 4 is driven along the reference line A. It is possible to contact and separate.
Therefore, the workpiece W, which is a shaft member, can be disposed along the reference line A between the sleeve holders 2 and 4 in a state where the pressure side sleeve holder 4 is sufficiently separated from the drive side sleeve holder 2. The workpiece W is made of a plastically deformable material such as metal.

  Thereafter, if the pressure-side sleeve holder 4 is moved toward the drive-side sleeve holder 2, both ends of the workpiece W are respectively fitted to the drive-side and pressure-side sleeve holders 2, 4 as shown in FIG. Thus, the workpiece W is held by the drive side and pressure side sleeve holders 2 and 4 while being sandwiched between the knockout pins 6 at both end faces thereof. At this time, the workpiece W is in a state where its axis coincides with the reference line A.

FIG. 2 shows details of the pressure side sleeve holder 4.
The pressure-side sleeve holder 4 has a bore 8 coaxially with the reference line A, and the inner peripheral surface of the bore 8 is formed as an inverted tapered surface 10 whose opening end side portion slightly expands toward the opening end. Has been. Such a reverse taper surface 10 is also provided on the drive side sleeve holder 2. In FIG. 2, the knockout pin 6 is omitted.

After the workpiece W is set between the driving side and pressure side sleeve holders 2 and 4 as described above, the pressure side sleeve holder 4 is moved toward the driving side sleeve holder 2 together with the knockout pin 6 while driving. The side sleeve holder 2 is rotated around the reference line A and is tilted with respect to the reference line A at a predetermined inclination angle.
Therefore, the workpiece W receives a compressive force in the axial direction while being rotated around its axis, while the portion of the workpiece W on the drive side sleeve holder 2 is tilted with respect to the portion of the workpiece W on the pressure side sleeve holder 4 side. To do. Here, the tilt center of the workpiece W is on the reference line A.

  When rotation, compression, and tilting are respectively applied to the workpiece W in this way, the portion of the workpiece W between the drive side sleeve holder and the pressure side sleeve holder 4 is restrained by the sleeve holders 2 and 4. Therefore, as shown in FIG. 3A, the outer peripheral surface bulges due to plastic deformation, and this bulge spreads over the entire circumference as the workpiece W rotates. Therefore, the workpiece W is formed with the enlarged portion H whose diameter is enlarged in a part thereof.

  Thereafter, as the pressure side sleeve holder 4 moves toward the drive side sleeve holder 2, the enlarged portion H further grows. When the enlarged portion H reaches the vicinity of the desired diameter and is sandwiched between the drive side and pressure side sleeve holders 2 and 4, at this point, the drive side sleeve holder 2 is tilted. The axis of the workpiece W is matched with the reference line A again.

Here, the rotation and compression of the workpiece W are continued, and as a result, an enlarged portion H having a desired diameter is formed between the drive side and pressure side sleeve holders 2 and 4 as shown in FIG. Thus, the shaft enlargement processing for the workpiece W is completed. Thereafter, the rotation and compression of the workpiece W are stopped.
Next, a method for discharging the workpiece W from the shaft enlargement processing machine will be described with reference to FIGS.

  First, the pressure side sleeve holder 4 is moved along the reference line A so as to be separated from the drive side sleeve holder 2 side, and the movement here is performed independently of the knockout pin 6 in the pressure side sleeve holder 4. Is done. Therefore, as shown in FIG. 4A, the knockout pin 6 of the pressure side sleeve holder 4 applies the pushing force F1 to one end portion of the work W toward the drive side sleeve holder 2, and from inside the pressure side sleeve holder 4 A part of one end of the work W is relatively extracted. The extraction here is, for example, as small as about 5 mm, but the tension output and the elastic repulsion force inherent in one end portion of the workpiece W are released by the above-described enlargement processing.

  Thereafter, the pushing-out of the workpiece W by the knock-out pin 6 is stopped while continuing the separation movement of the pressure-side sleeve holder 4, and this time, the knock-out pin 6 of the driving-side sleeve holder 2 is moved to the pressure-side sleeve holder 4. Then, the pushing force F2 is applied to the other end portion of the workpiece W, and the other end portion of the workpiece W is completely extracted from the drive side sleeve holder 2 as shown in FIG.

With this extraction, one end of the workpiece W is pushed again into the pressure side sleeve holder 4, and the pushing here is stopped when the enlarged portion H of the workpiece W comes into contact with the pressure side sleeve holder 4. . That is, the knockout pin 6 of the pressure side sleeve holder 4 is retracted to the original position with respect to the pressure sleeve holder 4 as the one end of the work W is pushed.
Thereafter, the knockout pin 6 of the pressure side sleeve holder 4 applies the above-described pushing force F1 again to one end portion of the work W as shown in FIG. 4C, and this time, the one end portion of the work W is moved to the pressure side. It is completely extracted from the sleeve holder 4 and the workpiece W is discharged from the shaft enlargement processing machine. At this time, the separation movement of the pressure side sleeve holder 4 is performed as necessary. That is, when the other end portion of the workpiece W is completely extracted from the drive side sleeve holder 2, the drive side and pressure side sleeve holders 2 and 4 are already sufficiently long enough to extract one end portion of the workpiece W. If it is separated, the separating movement of the pressure side sleeve holder 4 becomes unnecessary.

After the discharge of the workpiece W is completed, the knockout pin 6 of the pressure side sleeve holder 4 is moved back to the original position with respect to the pressure side sleeve holder 4, and the knockout pin 6 of the drive side sleeve holder 2 is moved back to the workpiece W. After the completion of the discharge, or prior to the completion of the discharge, the drive side sleeve holder is moved back to the original position.
At the time of extraction here, the tension output and the elastic repulsion force that were inherent in one end of the workpiece W have already been released in the partial extraction step in FIG. Even if the above-described reverse tapered surface 10 is formed on the inner peripheral surface of the bore 8, the workpiece W does not jump out of the pressure side sleeve holder 4 due to the tension output and the elastic repulsion force, and the shaft enlargement processing machine The workpiece W can be discharged safely from the machine.

As a result, even if the robot hand is used for loading / unloading the workpiece W into / from the shaft enlargement processing machine, the robot hand receives an overload caused by the workpiece W jumping out when the workpiece W is discharged from the shaft enlargement processing machine. No damage to the robot hand can be reliably prevented.
When the other end of the workpiece W is completely removed from the drive side sleeve holder 2, the tension output and elastic repulsion force inherent in the other end portion may work so that the workpiece W jumps out to the pressurizing side sleeve holder 4 side. However, at this time, since one end portion of the workpiece W is still held in the pressure side sleeve holder 4, the tension output and the elastic repulsion force of the other end portion of the workpiece W are moved from the driving side sleeve holder 2 to the workpiece W. It won't pop out.

The present invention is not limited to the above-described embodiment, and various modifications can be made.
For example, in one embodiment, first, one end portion of the work W on the pressure side sleeve holder 4 side is partially extracted, but the other end portion of the work W on the drive side sleeve holder 2 side is first partially removed. In the case of one embodiment, the tension output and the elastic repulsive force are released and the one end of the workpiece W is completely extracted, and then the other end of the workpiece W is completely extracted. Similar effects can be obtained.

It is the schematic of a shaft enlargement processing machine. FIG. 2 is a specific cross-sectional view of the drive side and pressure side sleeve holder of FIG. 1. The procedure of the shaft enlargement processing method by the shaft enlargement processing machine is shown. (A) shows during enlargement processing, and (b) shows the completion of enlargement processing. The procedure of the method of discharging the workpiece from the shaft enlargement processing machine is shown, (a) is a partial extraction step of one end of the workpiece, (b) is a complete extraction step of the other end of the workpiece, and (c) is a workpiece. Each shows a complete extraction process of one end of each.

Explanation of symbols

2 Drive-side sleeve holder 4 Pressure-side sleeve holder 6 Knockout pin (extrusion pin)
8 Bore 10 Reverse taper surface A Reference line F1, F2 Extrusion force H Enlarged part W Workpiece

Claims (2)

Both ends of the work consisting of shaft members are held in a pair of sleeve holders, and in this state, the work is given an axial compressive force and rotation around the axis, while one end of the work is moved with respect to the axis. In a shaft enlargement processing machine that tilts and forms an enlarged portion partially enlarged in the workpiece,
After the formation of the enlarged portion is completed, the workpiece in the one sleeve holder is separated from the other sleeve holder in the axial direction while one sleeve holder is separated from the other sleeve holder among the pair of sleeve holders on the workpiece axis. The one end of the workpiece is extruded toward the other sleeve holder, and the one end of the workpiece is partially removed from the one sleeve holder, and then the other end of the workpiece in the other sleeve holder is removed. Extruding toward the one sleeve holder side, completely pulling out the other end portion of the workpiece from the other sleeve holder while pushing the one end portion of the workpiece into the one sleeve holder, and thereafter, one end of the workpiece The shaft enlargement processing machine is characterized in that the extrusion of the part is resumed and one end of the workpiece is completely extracted from the one sleeve holder. Over click discharge method.   2. The work discharging method for a shaft enlargement processing machine according to claim 1, wherein the work is pushed out from the sleeve holder by push pins arranged coaxially in the sleeve holder. 3.

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