JP2605178B2 - Work mounting jig for internal gear cutting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Industrial Field of the Invention The present invention relates to a work mounting jig for internal gear cutting.

B. Conventional technology When forming internal teeth on a work, fix the work mounting jig on the table of the gear cutting machine, mount the work on this work mounting jig, and use a cutter provided on the gear cutting machine to set the internal gear. Cut teeth.

FIG. 4 shows an example of this type of conventional work mounting jig for internal gear cutting. In FIG. 1, reference numeral 1 denotes a table of a gear cutting machine, on which a base 2 is fixed. A casing 3 is fixed to the base 2, and a center guide 4 is fixed to the base 2 at the center of the casing 3. Reference numeral 5 denotes a work placed on a work receiving surface 6 of the casing 3, and a centering hole 5a is formed in the work 5, and the center guide 4 is inserted into the centering hole 5a to perform centering. Reference numeral 7 denotes a draw bar which is moved up and down by a cylinder (not shown). The work 5 is pressed downward by a clamping plate 8 fixed to the tip of the draw bar 7 and clamped. Further, a concave groove 10 is formed in the center guide 4, the concave groove 10 communicates with a groove 12 formed in the casing 3, and a hole 11 is formed in the clamping plate 8. The chips shaved by the cutting are discharged to the outside through the holes 11, the concave grooves 10, and the grooves 12.

C. Problems to be Solved by the Invention However, such a conventional work mounting jig for internal gear cutting has the following five problems.

(1) Since the clamping plate 8 is located above the concave grooves 10 and the grooves 12 for discharging the chips, the chips that have not fallen into the holes 11 accumulate on the clamping plate 8, and Poor emission.

(2) When the work 5 is replaced with the next work after the completion of the gear cutting, the fastening plate 8 must be removed, and it takes time to replace the work.

(3) Since the portion to be clamped by the clamping plate 8 and the portion to be cut by the cutter 9 are separated in the axial direction, the work 5 is easily bent due to the cutting resistance, and the internal teeth are cut. Poor surface finish.

(4) Since the work is centered on the jig by a so-called spigot method, a predetermined clearance (for example, about 0.01 to 0.03 mm) must be formed between the centering hole 5a and the center guide 4. For this reason, when the work 5 is clamped downward with the fastening plate 8, the center of the work 5 is deviated from the center of the center guide by this gap, and the centering accuracy is poor. As a result, desired gear cutting accuracy cannot be obtained.

(5) If cutting chips adhere to the outer peripheral surface of the center guide 4 together with the cutting oil when removing the work 5, when the next work 5 is mounted on the center guide 4, there is a galling between the centering hole 5 a and the center guide 4. Occurs. For this reason, every time the work 5 is removed, it is necessary to manually clean the outer peripheral surface of the center guide 4, resulting in poor workability.

An object of the present invention is to facilitate the discharge of chips shaved by a cutter, shorten the time required for workpiece replacement, improve cutting conditions for gear cutting, improve gear cutting accuracy, and improve the cleaning performance when replacing workpieces. An object of the present invention is to provide a work mounting jig for internal gear cutting that can save labor.

D. Means for Solving the Problems To be described with reference to FIG. 1 showing an embodiment, the present invention comprises a base 22 and a work fixed to the base 22,
Inner hollow body 24, 26 formed with receiving surface 26a on which 29 is placed
Are extrapolated to the inner hollow bodies 24, 26, and the inner hollow bodies 24, 26
The cylinder chamber 32 is formed between the cylinder chamber 32 and the outer peripheral surfaces of the inner hollow bodies 24 and 26 are slid by the pressure oil introduced into the cylinder chamber 32 to move in one direction, and attached by the elastic body 23 in the other direction. Outer hollow bodies 30 and 31 to which power is applied and inner hollow bodies 24 and 26
A ring-shaped work holding member having an inner diameter in which the work 29 can be inserted, which is provided coaxially with the inner hollow bodies 24 and 26, and accommodates the work 29 on the inner circumferential side of the ring and receives the inner circumferential edge. The work 29 is deformed toward the surface 26a and the
A work holding member 28 for centering the work 29 and clamping it to the receiving surface 26a by pressing it toward 2, and provided in the outer hollow bodies 30, 31 to move the outer hollow bodies 30, 31 in one direction. And a pressing member 33 that presses the inner peripheral edge of the work holding member 28 to deform it toward the receiving surface 26a, and discharges chips and the like on the upper surface of the base 22 surrounded by the inner hollow bodies 24 and 26 to the outside. The above object is achieved by forming the grooves 25a and 22a.

E. Operation The ring-shaped work holding member 28 clamps the work 29 directly downward from the outside of the work 29. Therefore, the work
Clamping from the inside of 29 is unnecessary, the upper part of the base 22 is completely opened, and the chips fall reliably on the base 22 and are discharged from the discharge grooves 25a and 22a. Further, only by loosening the pressing of the pressing member 33 against the work holding member 28, the work 29
The clamping force to the workpiece 29 is released, and the work 29 can be easily attached and detached. Further, the work 29 is clamped on its outer peripheral surface side,
As a result, the vicinity of the cut portion can be clamped outside the cut portion, and the cutting conditions are improved. Furthermore, since the work holding member 28 is deformed and clamped while the work 29 is centered, there is no gap between the two and the work 29 and the work holding member 28 are not misaligned. Further, since the work holding member 28 is located outside the work 29, even if the work 29 is removed, it is possible to prevent chips from adhering to the work holding member 28.

In the above sections D and E for describing the configuration of the present invention, the drawings of the embodiments are used for easy understanding of the present invention, but the present invention is not limited to the embodiments.

F. Embodiment Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

In FIG. 1 and FIG. 2, reference numeral 21 denotes a table of a gear cutting machine.
Has been fixed. On the upper surface of the base 22, six concave grooves 22a are formed radially from the inner side to the outer side, and the concave grooves 22a are inclined downward and outward. A spring 23 having an urging force in the axial direction is provided on a peripheral portion of the upper surface of the base 22, and urges the cylinder tube 30 upward as described later.

Reference numeral 24 denotes a cylinder rod fixed to the base 22, and a hollow hole 24a is formed at the center of the cylinder rod 24,
A center boss 25 on a substantially disk fixed to the center of the upper surface of the base 22 is provided coaxially with the hollow hole 24a. Six concave grooves 25a are formed radially on the upper surface of the center boss 25, and these concave grooves 25a are positioned so as to face the concave grooves 22a of the base 22, and cutting powder or cutting is formed through the concave grooves 25a, 22a. Drain the oil outside.

Reference numeral 26 denotes a guide ring on a substantially hollow disk. The guide ring 26 is fixed to the upper surface of the cylinder rod 24 via a pin 24b, and the hollow hole 26a communicates with the hollow hole 24a. A work receiving surface 26a is formed on the upper surface on the inner peripheral edge side of the guide ring 26, and a plurality of pinholes 27 connected to an air supply passage 22d described later are formed on the work receiving surface 26a on the circumference. An upwardly inclined surface 26c is formed from the work receiving surface 26a of the guide ring 26 toward the outer peripheral side, and an upright wall 26d is formed on the outermost peripheral side. A so-called ring span 28 in the shape of a disc spring is fitted on the inner peripheral side of the standing wall 26d,
The work 29 is placed on the work receiving surface 26a through the hollow hole 28a of the ring span 28.

The ring span 28 has an outer end 28 as shown in FIG.
b, a notch 28c formed radially outward and an inner end 28d thereof
Each has a notch 28e formed radially inward, and is deformed by pressing its inner peripheral edge downward to deform the work 29.
And presses and fixes it to the work receiving surface 26a.

Reference numeral 30 denotes a vertically movable cylinder tube externally inserted into the cylinder rod 24. The cylinder tube 30 is constantly urged upward by the above-described spring 23, and pressurizes the cylinder chamber 32 formed between the cylinder rod 24 and the cylinder tube 30. When the oil is supplied, it descends against the urging force of the spring 23. Reference numeral 31 denotes a substantially cylindrical drum fixed to the cylinder tube 30 via a half-moon pin 36, and a circular clamp plate 33 is provided on the upper surface of the drum 31.
Has been fixed. A hollow hole 33a into which the work 29 is inserted is formed at the center of the round fastening plate 33, and a projection 33b protruding downward by engaging the upper surface of the inner end 28d of the ring span 28 at the inner end thereof. Are formed. 34 is internal teeth 2 on work 29
This is a cutter for processing 9a.

A center joint 35 is rotatably inserted into the center of the base 22, and a hydraulic port 35a formed in the center joint 35 communicates with the cylinder chamber 32 via an oil passage 22b. The air port 35b formed in the center joint 35 communicates with the pinhole 27 via the air passage 22c.

 Next, the operation of the embodiment of the present invention will be described.

The air is supplied to the airport 35b, and is ejected from the pinhole 27 through the air passage 22c. Next, the work 29 is placed on the work receiving surface 26a through the hollow hole 33a of the round clamping plate 33 and the hollow hole 28a of the ring span 28 by a robot hand (not shown), and pressure oil is supplied to the hydraulic port 35a. This pressure oil is supplied to the cylinder chamber 32 through the oil passage 22b, and the cylinder tube 30 descends against the spring 23, so that the round clamping plate 33 also descends. The protrusion 33b of the round fastening plate 33 pushes down the inner end 28d of the ring span 28, whereby the ring span 28 is deformed downward on the inner end 28d side with the outer end 28b as a fulcrum. Since the ring span 28 has the same resilience as a disc spring, the ring span 28 presses the work 29 inward from the inner end portion 28d side to center the work 29 and simultaneously presses the work 29 against the work receiving surface 26a. At this time, the pinhole 27 is completely closed by the work 29, and the pressure sensor provided in the air circuit (not shown) is turned on. For example, a buzzer or a lamp is made to blink by an ON signal of this sensor, and the centering of the work 29 and the completion of clamping are notified.

Thereafter, the cutter 34 cuts the internal teeth 29a.
At this time, since the inner end 28d of the ring span 28 clamps the work 29 in the vicinity of the gear cutting portion, chatter due to the processing does not occur, and a good cut surface can be obtained. Moreover, the inner peripheral surface on the inner end portion 28d side and the work 29
Because there is no gap between the outer peripheral surface of the
Accurate centering is possible, resulting in highly accurate internal teeth
29a is processed. Next, the chips shaved by the cutter 34 fall onto the concave groove 25a whose upper part of the groove is completely open, and are reliably and smoothly discharged to the outside through the concave groove 22a together with the cutting oil. .

After the machining of the internal teeth 29a is completed, when the pressure oil in the cylinder chamber 32 is discharged from the hydraulic port 35a, the cylinder tube 30
Is pushed up by the spring 23 and the projection of the round clamping plate 33 is
The pressing of the ring span 28 by 33b is released, the ring span 28 is restored to its original shape, and the clamp of the work 29 is released. The work 29 is removed by a robot hand (not shown), and the next work can be placed on the receiving surface 26a.

In the case of replacing the work 29 in this manner, it is not necessary to manually remove a fixture or the like as in the related art, and the work can be automatically and easily replaced. Furthermore, when the work 29 is removed, since the inner end 28d is located outside the work 29, chips do not adhere to the inner end 28d. As a result, only the inside of the jig needs to be cleaned with the cutting oil, and the cleaning of the inside of the jig can be automated.

In the configuration of the above embodiment, the table 22 serves as a base,
The cylinder rod 24 and the guide ring 26 constitute an inner hollow body, the cylinder tube 30 and the drum 31 constitute an outer hollow body, the ring span 28 constitutes a work holding member, and the round clamping plate 33 constitutes a pushing member.

G. Effects of the Invention As described above, according to the present invention, a workpiece is placed on a workpiece receiving surface formed on a hollow body, and a ring-shaped workpiece holding member disposed outside the workpiece is deformed. The center of the workpiece is clamped to the receiving surface, and a groove is provided to communicate the inside of the hollow body with the outside. As a result, highly accurate internal tooth processing becomes possible, and chips and the like easily fall into the hollow body and are reliably discharged to the outside.

[Brief description of the drawings]

1 to 3 show one embodiment of the present invention.
2 is an exploded perspective view, FIG. 3 is a plan view of a ring span, and FIG. 4 is a cross-sectional view showing a conventional work mounting jig for cutting an internal gear. 22: Base, 22a, 25a: Concave groove 23: Spring, 26a: Workpiece receiving surface 27: Pinhole, 28: Ring span 29: Workpiece, 30: Cylinder tube 32: Cylinder chamber, 33: Round clamp plate 33b: Projection

Claims (1)

(57) [Claims] An inner hollow body fixed to the base and having a receiving surface on which a work is mounted on an upper surface; and an inner hollow body externally inserted into the inner hollow body. An outer hollow body in which a cylinder chamber is formed, and the outer peripheral surface of the inner hollow body is moved in one direction by sliding on an outer peripheral surface of the inner hollow body with pressure oil introduced into the cylinder chamber, and is biased by an elastic body in the other direction. And provided coaxially with the inner hollow body on the inner hollow body,
A ring-shaped work holding member having an inside diameter into which the work can be inserted, wherein the work is accommodated on an inner peripheral side of a ring, and an inner peripheral edge is deformed to the receiving surface side to move the work from the outer peripheral surface thereof. A work holding member for centering the work and clamping to the receiving surface by pressing the work toward the table; and a work holding member provided in the outer hollow body, the work holding being performed by moving the outer hollow body in the one direction. A pressing member for pressing an inner peripheral edge of the member to deform the receiving surface side, and a groove for discharging chips and the like on the upper surface of the base surrounded by the inner hollow body to the outside is formed. Features a work mounting jig for internal gear cutting.