JP4227551B2 - Work rotation device - Google Patents

Description

  The present invention relates to a workpiece rotating device of a deep hole processing machine using a long tool such as a gun drill.

A deep hole processing machine that uses a long tool such as a gun drill generally employs a tool rotation method in which a workpiece is fixed and the tool is rotated. The advantage of this tool rotation method is that machining is possible even for irregularly shaped workpieces and large workpieces that cannot be rotated. The gun drill is advanced while rotating, and deep holes are machined in the workpiece. The tip of the gun drill is provided with a steady rest to suppress the shake of the tool that is the gun drill (for example, see Patent Document 1).
However, this tool rotation method has a drawback in that a deep hole is misaligned.
Therefore, as a method of eliminating this misalignment, a work and tool rotation method for rotating the work is adopted. By rotating the workpiece, the misalignment of the deep hole is corrected, high-precision machining can be performed, and the feed can be increased by an increase in the number of rotations of the workpiece, so that productivity can be improved.

  FIG. 5A is a front view of a conventional deep drilling machine for gun drills. As shown in FIG. 5A, a base 22 a is placed on the bed 21 of the deep hole processing machine 20. A guide rail 22b is disposed on the base 22a, and a table 22c slidable in the Z1 axis (left and right) direction is disposed on the guide rail 22b. On this table 22c, a headstock 23 is placed on the right side facing the front, and a long gun drill 24 is mounted on the spindle of the headstock 23. Similarly, a guide rail (not shown) is disposed on the left side of the bed 21, and a slide 21 a slidable in the Z2 axis (left and right) direction is disposed on the guide rail. A conventional work rotation device 30 is placed on the slide 21a.

FIG. 5B is an external view of a conventional workpiece rotating device 30. As shown in FIG. 5B, the spindle stock 31 of the workpiece rotating device 30 is provided with a rotatable spindle (not shown). A collet chuck 33 is attached to the main shaft, and a collet 34 is attached to the collet chuck 33. A cylinder 35 for clamping (gripping) and unclamping (releasing) the workpiece W by opening and closing the collet 34 is built in the rear portion of the headstock 31. In order to rotate the workpiece W, a belt 36b is hung between a pulley 36a fitted on the outer periphery of the main shaft and a pulley 36a provided on the motor shaft of the motor 36c, so that the rotational force of the motor 36c is increased. The work W is rotated by being transmitted to the main shaft.
JP 2001-105215 A (paragraph 0023, FIG. 4)

  However, since the conventional workpiece rotating device 30 does not have a penetrating hollow structure, there is a problem that only a short workpiece can be processed and a long workpiece cannot be processed. Further, since the work rotating device cannot penetrate the rear end portion of the long workpiece, there is a problem that the work rotating device cannot be machined even if the workpiece rotating device is reversed to process from the rear end portion of the workpiece.

  Therefore, the present invention was devised to solve these problems, and even when the workpiece is long, the workpiece can be clamped. From the rear end of the workpiece, the workpiece rotating device is reversed. It is an object of the present invention to provide a hollow structure work rotation device capable of processing the above.

The invention of the workpiece rotating device 10 according to claim 1 is a workpiece rotating device that includes a clamp mechanism that clamps the workpiece and is equipped with a motor that rotates the workpiece, and is fitted to the body 1 and the body 1. A substantially ring-shaped housing 2 in which a flange portion 2a is formed, bearings 3 and 3 are fitted in the housing 2 and rotatably supported, a gear 13 is fixed to the outer periphery, and a tapered hole 4a is provided to the inner periphery. Are attached to a tapered hole 4a of the main shaft 4 and have a cylindrical collet 5 having an outer peripheral screw portion 5a at the rear end thereof, and are screwed to the outer peripheral screw portion 5a of the collet 5, co that the collet retraction ring 6 having an outer peripheral threaded portion 6a, the tip portion 7a is fitted into the rear outer peripheral portion 4b of the spindle 4, the rear end portion 7b is screwed to the outer circumferential screw portion 6a of the collet retraction ring 6 Le A retraction knob 7, a front Symbol housing 2 and the end bracket 11 is fitted into the formed space, the cylinder portion 12 of the piston 8 is inserted for advance and retreat in the main shaft axially by the hydraulic fluid, idling the gear 13 The gear 14 meshes, the idle gear 14 meshes with the gear 15 fitted on the motor shaft 16a, and the motor 16 generates a rotational force. The main shaft 4, the collet 5 and the collet pulling ring 6 are Bearings 9a and 9b are provided so as to sandwich an inner peripheral convex portion 8a formed to protrude from the inner periphery of the piston 8 on the outer periphery 7c of the collet pulling knob 7 so as to pass through the workpiece so that it can pass through. the bearings 9a, characterized in that rotatably supports the collet retraction knob 7 through 9b A work rotating device 10 of the hollow structure.

  The invention according to claim 2 is the workpiece rotating device 10 according to claim 1, wherein the collet 5 is mounted on the main shaft 4.

  The invention according to claim 3 is the workpiece rotating device 10 according to claim 2, wherein the collet retracting ring 6 is screwed to the rear end of the collet 5.

  According to the first aspect of the present invention, the workpiece rotating device having a hollow structure can be clamped even if the workpiece is long, and the workpiece rotating device can be reversed and processed from the rear end of the workpiece. It is possible to provide a workpiece rotating device that has no restriction in direction.

  According to the second aspect of the present invention, since the main shaft has the function of the conventional collet chuck, the collet chuck itself becomes unnecessary and a compact work rotating device can be provided.

  According to the invention of claim 3, since the collet retracting ring is screwed to the rear end of the collet, the work can pass through the collet retracting ring, and the work rotating device can be reversed from the rear end of the work. Can also drill deep holes.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 shows a deep hole processing machine using a long tool of a gun drill, FIG. 1 (a) is a front view of the deep hole processing machine 20, and FIG. 1 (b) is a left side view of the deep hole processing machine 20. It is. In addition, the description which overlaps with description of above-mentioned FIG. 4A attaches | subjects the same code | symbol, and abbreviate | omits description. As shown in FIG. 1A, a high-power panel 28 is disposed on the right side of the front view of the bed 21. Further, as shown in FIG. 1B, guide rails 21b and 21b are disposed on the left side of the bed 21 of the gun drill deep hole processing machine 20, and a Z2 axis (on the guide rails 21b and 21b) A slide 21a that is slidable in the (left-right) direction is provided. The work rotation device 10 is placed on the slide 21a.
As shown in FIG. 1 (b), at the rear of the deep hole processing machine 20, a high-pressure coolant is supplied from the cutting edge for cooling the cutting edge of the gun drill 24 (see FIG. 1 (a)) and discharging chips. A high-pressure coolant unit 29 for injecting is installed. Further, the chips and coolant liquid cut out by the cutting edge of the gun drill 24 are first recovered by the tip box 26 (see FIG. 1A), and then recovered by the large tip box 26b through the chute 26a.

FIG. 2 is a cross-sectional view showing the workpiece rotating device 10 of the present invention. As shown in FIG. 2, the body 1 which is the main body of the work rotation device 10 is placed and fixed on a slide 21a (see FIG. 1A).
A substantially ring-shaped housing 2 is fitted into a hole 1a provided in the body 1, and a flange portion 2a is fixed to the body 1 by a bolt 1b.
The main shaft 4 has a tapered hole 4 a on the inner periphery, and the main shaft 4 is rotatably supported on the housing 2 via bearings 3 and 3. A gear 13 is fixed to the outer periphery of the main shaft 4.
The collet 5 mounted in the tapered hole 4a of the main shaft 4 has a cylindrical shape, penetrates so that the rod-shaped workpiece W can pass through, and has an outer peripheral threaded portion 5a at the rear end portion of the collet 5.
A plurality of slits 5b are formed at the tip of the collet 5 and are easily elastically deformed.
The collet drawing ring 6 for drawing the ring-shaped collet 5 is screwed to the outer peripheral screw portion 5a of the collet 5, and has an outer peripheral screw portion 6a at the rear end portion.
The collet retraction knob 7 has a front end portion 7a fitted to the rear end outer peripheral portion 4b of the main shaft 4, a rear end portion 7b screwed to the outer peripheral screw portion 6a of the collet retraction ring 6, and a piston 7 on the outer periphery 7c. 8 is rotatably supported by bearings 9a and 9b sandwiching an inner peripheral convex portion 8a protruding on the inner periphery.
The cylinder part 12 has a piston 8 inserted in a space formed by the housing 2 and the end bracket 11. When the piston 8 is retracted and advanced in the axial direction of the main shaft 4 by the working fluid that is air, the collet 5 is opened and closed by the tapered hole 4a provided in the inner periphery of the front end portion of the main shaft 4, and the workpiece W is clamped and unclamped. . Thus, the clamp mechanism which clamps the workpiece | work W is incorporated.
In the motor 16, the gear 15 fitted in the motor shaft 16 a meshes with the idle gear 14, the idle gear 14 meshes with the gear 13 fixed to the main shaft 4, and the motor 16 transmits the rotational force to the main shaft 4. To rotate the workpiece W.
As described above, the workpiece rotating device 10 is configured as described above.

Here, operation | movement of the deep hole processing machine 20 using the workpiece | work rotation apparatus 10 is demonstrated with reference to FIG. 1, FIG.
(1) When the workpiece W is inserted into the cylindrical collet 5 of the workpiece rotating device 10 and the workpiece clamp button (not shown) on the operation panel 27 (see FIG. 1A) is pressed, the high-pressure air is supplied to the pneumatic joint A. The piston 8 is retreated (moved leftward in FIG. 2), the cylindrical collet 5 is retreated, and the workpiece W is clamped (gripped).
(2) When a forward button (not shown) of the work rotating device 10 is pressed, the air cylinder 21c (see FIG. 1B) moves forward (Z2 axis), and the work W is pressed against the drill bush of the chip box 26.
(3) When a rotation start button (not shown) of the workpiece rotating device 10 is pressed, the motor 16 rotates, and rotational force is transmitted to the gear 15, the idle gear 14, and the gear 13 to rotate the main shaft 4.
(4) Press the spindle rotation start button (not shown) of the headstock 23 to rotate the gun drill 24. Press the coolant start button (not shown). When a forward start button (not shown) of the headstock 23 is pressed, the headstock 23 disposed on the table 22c of the deep hole drilling machine 20 is pressurized from the cutting edge of the gun drill 24 (see FIG. 3A). The coolant liquid is jetted and advanced by cutting feed toward the tip of the rotated workpiece W. Then, cutting starts. 3 is an explanatory diagram showing the machining status of the work rotation device 10, (a) is an explanatory diagram showing the first step, (b) is an explanatory diagram showing the second step. As shown in FIG. 3A, in the case of a long workpiece W, the first step processes about half of the workpiece W by clamping with a collet 5 (see FIG. 2).
(5) Subsequently, the work rotating device 10 is reversed. Then, as shown in FIG. 3B, the remaining half of the deep hole is machined according to the same procedure, and the headstock 23 returns to the original position (see FIG. 1).
(6) When the retreat button (not shown) of the work rotating device 10 is pressed, the air cylinders 21c and 21c (see FIG. 1B) retreat (Z2 axis), and the work W is moved from the chip box 26 (see FIG. 1). Are separated.
(7) When a work unclamp button (not shown) is pressed, high-pressure air is supplied from the pneumatic joint B, the piston 8 moves forward, the collet 5 moves forward, and the grip of the work W is released. Therefore, the work is completed by taking the workpiece W out of the machine.
As described above, if the deep hole machining of the long workpiece W which cannot be performed by the conventional workpiece rotating device 30 (see FIG. 5) is the workpiece rotating device 10 of the present invention, it can be processed.

FIG. 4 shows a drilling method when the long workpiece W has the protrusion Wa, FIG. 4 (a) is an explanatory view showing the first step, and FIG. 4 (b) shows the workpiece W inverted. It is explanatory drawing which shows a 2nd process. As shown in FIG. 4A, a branch-like projection is formed on one shaft end of the workpiece W. In the first step in this case, the workpiece W is inserted from the front of the workpiece rotating device 10 and clamped by a collet, and then a half of the workpiece W is machined by the gun drill 24. Further, as shown in FIG. 4B, in the second step, the workpiece W is once extracted, turned over, inserted from the rear of the workpiece rotating device 10 and similarly clamped by a collet, and then by a gun drill 24. The remaining half of the workpiece W is processed.
As described above, in the conventional workpiece rotating device 30 (see FIG. 5), the first step can be performed, but the second step cannot be performed. However, the workpiece rotating device 10 of the present invention has the protrusion Wa. Even long workpieces W can be processed.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and can be implemented with appropriate modifications. For example, as shown in FIG. 2, the collet 5 of the work rotating device 10 is mounted on the front side, but the housings 2 and 2 may be mounted on the body 1 from both sides, and double collets 5 and 5 may be provided. .

The deep hole processing machine which uses the long tool of a gun drill is shown, (a) is a front view of a deep hole processing machine, (b) is a left view of a deep hole processing machine. It is sectional drawing which shows the workpiece | work rotation apparatus of this invention. The use condition of a workpiece | work rotating apparatus is shown, (a) is explanatory drawing which shows the state which processes the half of a workpiece | work, (b) is explanatory drawing which shows the state which reverses and processes a workpiece | work rotating apparatus. The drilling method in case a protrusion is in a long workpiece | work is shown, (a) is explanatory drawing which shows a 1st process, (b) is explanatory drawing which shows a 2nd process. It is a front view of the conventional deep hole processing machine for gun drills, (b) is an external view of the conventional workpiece rotating apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Body 1a Hole 1b Bolt 2 Housing 2a Flange part 3 Bearing 4 Main shaft 4a Tapered hole 4b Outer peripheral part of rear end 5 Collet 5a Outer peripheral thread part 6 Collet retracting ring 6a Outer peripheral thread part 7 Collet retracting knob 7a Front end part 7b Rear end part 7c Outer peripheral part 8 Piston 8a Inner peripheral convex part 9a, 9b Bearing 10 Work rotating device 11 End bracket 12 Cylinder part 13, 15 Gear 14 Idle gear 16 Motor 16a Motor shaft 20 Deep hole processing machine

Claims (3)

A work rotation device with a built-in clamp mechanism that clamps the work and a motor that rotates the work.
Body (1),
A substantially ring-shaped housing (2) fitted to the body (1) and having a flange (2a) formed thereon;
Bearings (3, 3) are fitted into the housing (2) and rotatably supported, a gear (13) is fixed to the outer periphery, and a main shaft (4) having a tapered hole (4a) on the inner periphery. ,
A cylindrical collet (5) mounted in the tapered hole (4a) of the main shaft (4) and having an outer peripheral thread portion (5a) at the rear end;
A collet lead-in ring (6) screwed to the outer peripheral threaded portion (5a) of the collet (5) and having an outer peripheral threaded portion (6a) at the rear end;
Tip (7a) is fitted to the rear end outer peripheral portion (4b) of the spindle (4), the rear end (7b) is collet screwed to the outer circumferential screw portion (6a) of the collet retraction ring (6) Retraction knob (7);
Before SL is fitted into the space formed by the housing (2) and end bracket (11), a cylinder portion of the piston (8) has been inserted to advance and retreat in the main shaft axially by the working fluid (12),
An idler gear (14) meshes with the gear (13), and a gear (15) fitted into a motor shaft (16a) meshes with the idler gear (14), thereby generating a rotational force. ,
The main shaft (4), the collet (5), and the collet pull-in ring (6) are configured with a hollow structure that penetrates so that the workpiece can pass through,
Bearings (9a, 9b) are provided on the outer periphery (7c) of the collet pull-in knob (7) so as to sandwich an inner peripheral convex portion (8a) formed protruding from the inner periphery of the piston (8). 9b), the collet retracting knob (7) is rotatably supported by a hollow structure work rotating device (10).
  The work rotating device (10) according to claim 1, wherein the collet (5) is mounted on the main shaft (4).   The work rotating device (10) according to claim 2, wherein the collet retracting ring (6) is screwed to a rear end of the collet (5).

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