JPH04176512A - Work mounting jig for internal tooth cutting - Google Patents

Abstract

PURPOSE:To smooth ejection of chips and to reduce time for replacing a work by mounting the work on a work receiving surface formed on hollow bodies and by deforming a work pressing member in the ring state arranged on its outside so as to center the work with clamping it on the receiving surface. CONSTITUTION:Inner hollow bodies 24 and 26 in which a receiving surface 26a is formed are fixed on a base 22, and outer circumferential surfaces of the inner hollow bodies 24 and 26 are slid by pressure oil introduced into a cylinder chamber 32 formed between the hollow bodies 24 and 26 so as to be moved in one direction, while outer hollow bodies 30 and 31 to which a force is applied to the other direction by an elastic body 23 are inserted into the hollow bodies 24 and 26. And a work pressing member 28 for storing 29 and deforming an inner circumferential edge to the side of the receiving surface 26a so as to center the work 29 and to clamp it on the receiving surface 26a is provided, and a pushing member 33 for pushing and deforming the inner circumferential edge of the work pressing member 28 by movement of the outer hollow bodies 30 and 31 are provided. Moreover, grooves 25a and 22a for ejecting chips on an upper surface of the base 22 surrounded by the inner hollow bodies 24 and 26 to outside are formed on a center guide 25 and the base 22.

Description

[Detailed description of the invention] A. Industrial application field The present invention relates to a workpiece mounting jig for internal gear cutting.

B. Conventional technology When forming internal teeth on a workpiece, a workpiece mounting jig is fixed on the table of a gear cutting machine, the workpiece is mounted on this workpiece mounting jig, and a cutter provided on the gear cutting machine is used to cut internal teeth. Cut your teeth.

FIG. 4 shows an example of a conventional workpiece mounting jig for this type of internal gear cutting. In the figure, 1 is a table of a gear cutting machine, and a base 2 is fixed on top of this table 1. A casing 3 is fixed to the base 2, and the casing 3
A center guide 4 is fixed to the base 2 at the center. 5 is a work placed on the work receiving surface 6 of the casing 3, and this work 5 has a centering hole 5a formed therein.

The center guide 4 is inserted into the centering hole 5a to perform centering. Reference numeral 7 denotes a drawer which is moved up and down by a cylinder (not shown), and the workpiece 5 is pressed downward and clamped by a tightening plate 8 fixed to the tip of the drawer half, and internal teeth are cut into the workpiece 5 by a cutter 9.

Further, a groove 10 is formed in the center guide 4, and this groove 10 communicates with a groove 12 formed in the casing 3. Furthermore, a hole 11 is formed in the tightening plate 8.
The chips shaved by the cutter 9 are removed from the hole 11° and the concave groove 10.
, and are discharged to the outside through the groove 12.

Problems to be Solved by the C0 Invention However, when it comes to mounting jigs for workpieces for conventional internal gear cutting, there are the following five problems.

(1) Since the clamping plate 8 is located above the concave groove 10 and the groove 12 for discharging chips, the chips that do not fall into the hole 11 will accumulate on the clamping plate 8, and the chips will be removed. Poor drainage.

(2) When replacing the workpiece 5 with the next workpiece after gear cutting is completed, the clamping plate 8 must be removed, and it takes time to replace the workpiece.

(3) Since the part clamped by the clamping plate 8 and the part cut by the cutter 9 are separated in the axial direction, the workpiece 5 is easily bent due to cutting resistance and chatter is likely to occur, and the internal teeth cannot be cut. The accuracy of the finished surface is poor.

(4) Since the workpiece is centered on the jig using a so-called piloting method, a predetermined gap (for example, about 0.01 to 0°03 m+) must be formed between the centering hole 5a and the center guide 4. Must be. For this reason, the workpiece 5 is
When clamped downward, the center of the workpiece 5 deviates from the center of the center guide by this gap bone, resulting in poor centering accuracy. As a result, the desired gear cutting accuracy cannot be obtained.

(5) If chips and cutting oil adhere to the outer peripheral surface of the center guide 4 when removing the workpiece 5, galling may occur between the centering hole 5a and the center guide when attaching the next workpiece 5 to the center guide 4. Occur. For this reason, it is necessary to manually clean the outer circumferential surface of the center guide 4 every time the workpiece 5 is removed, resulting in poor workability.

The purpose of the present invention is to smoothly discharge chips cut by a cutter, shorten the time for changing workpieces, improve cutting conditions for gear cutting, improve gear cutting accuracy, and reduce cleaning when changing workpieces. A workpiece attachment for internal gear cutting that can save time and effort lies in providing a jig.

Means for Solving Problems No. 90 The present invention will be explained in conjunction with FIG. 1 showing an embodiment of the invention. A cylinder chamber 32 is formed between the inner hollow body 24.26 in which 26a is formed and the hollow body 24.26 that is inserted into this hollow body 24.26, and the pressure oil introduced into the cylinder chamber 32 is The outer hollow body 3 slides on the outer peripheral surface of the inner hollow body 24, 26 and moves in one direction, and is biased in the other direction by the elastic body 23.
0.31, a ring-shaped work holder provided on the inner hollow bodies 24 and 26, and a work 2 on the inner circumferential side of the ring.
9 and deforms the inner peripheral edge toward the receiving surface 26a to center the workpiece 29 and clamp it to the receiving surface 26a. It is provided with a pushing member 33 that presses and deforms the inner peripheral edge of the base 22, and further has grooves 25a and 22a for discharging chips and the like on the upper surface of the base 22 surrounded by the inner hollow body 24 and 26. , thereby achieving the above objective.

The E0 action ring-shaped work holding member 28 clamps the work 29 directly downward from the outside of the work 29.

Therefore, there is no need to clamp the workpiece 29 from inside, the upper part of the base 22 is completely opened, and chips are removed from the base 22.
2 and the discharge groove 25a.

It is discharged from 22a. In addition, by simply loosening the pressure on the workpiece holding member 28 by the pushing member 33, the workpiece 29 can be
The clamping force on the workpiece 29 is released, and the workpiece 29 can be easily attached and detached. Furthermore, the workpiece 29 is clamped on its outer circumferential surface side, and as a result, the vicinity of the cutting portion can be clamped on the outside thereof, resulting in favorable cutting conditions. Furthermore, since the workpiece 29 is clamped while centering it by deforming the workpiece holding member 28, there is no gap between the two, and there is no misalignment between the workpiece 29 and the workpiece holding member 28. Moreover, since the workpiece holding member 28 is located outside the workpiece 29, even if the workpiece 29 is removed, chips are prevented from adhering to the workpiece holding member 28.

In the above-mentioned sections and section E, which describe the present invention in detail, figures of embodiments are used to make the present invention easier to understand, but the present invention is not limited to the embodiments.

F. Examples Examples of the present invention will be described below with reference to FIGS. 1 to 3.

In FIGS. 1 and 2, 21 is a table of a gear cutting machine, and a disc-shaped base 22 is fixed to the upper surface of this table 21. On the upper surface of the base 22, six concave grooves 22a are formed radially from the inside to the outer periphery, and the grooves 22a are sloped downward toward the outside. A spring 23 having a biasing force in the axial direction is installed on the peripheral edge of the upper surface of the base 22, and biases the cylinder tube 30 upward as will be described later.

24 is a cylinder rod fixed to the base 22;
A hollow hole 24a is formed in the center of the cylinder rod 24, and a substantially disc-shaped center boss 25 fixed to the center of the upper surface of the base 22 is disposed coaxially with the hollow hole 24a. There are six radial grooves 2 on the top surface of the center guide 25.
5a is formed, and this groove 25a is positioned so as to face the groove 22a of the base 22.
.

Cutting powder and cutting oil are discharged to the outside through 22a.

Reference numeral 26 denotes a guide ring on a substantially hollow disk. This guide ring 26 is fixed to the upper surface of the cylinder rod 24 via a pin 24b, and its hollow hole 26a communicates with the hollow hole 24a. A workpiece receiving surface 26a is formed on the upper surface of the inner peripheral edge of the guide ring 26, and a plurality of pinholes 27 are opened on the circumference of the workpiece receiving surface 26a, and the workpiece receiving surface 26a is connected to an air supply passage 22d, which will be described later. An inclined surface 26c having an upward slope is formed from the winding receiving surface 26a of the labor idle ring 26 toward the outer circumferential side, and a vertical wall 26d is formed on the outermost circumferential side. A so-called ring span 28 shaped like a disc spring is fitted into the inner peripheral side of the vertical wall 26d, and the workpiece 29 is
It is inserted through the hollow hole 28a of the ring span 28 and placed on the workpiece receiving surface 26a.

The ring span 28 has its outer end 2 as shown in FIG.
8b has a notch 28C formed radially outward, and an inner end 28d thereof has a notch 28e formed radially inward, and when the inner peripheral edge is pressed downward, the workpiece 29 is deformed. The workpiece is press-fixed to the workpiece receiving surface 26a while centering the workpiece.

Reference numeral 30 denotes a cylinder tube that is fitted onto the cylinder rod 24 and is movable up and down, and is constantly urged upward by the spring 23 described above to apply pressure to the cylinder chamber 32 formed between the cylinder rod 24 and the cylinder tube 30. When oil is supplied, it moves downward against the biasing force of the spring 23. 31 is a substantially cylindrical drum fixed to the cylinder tube 30 via a half-moon pin 36;
A final tightening plate 33 is fixed to the upper surface of 1. End tightening plate 33
A hollow hole 33a into which the work 29 is inserted is formed at the center of the hole 33a, and the inner end 28 of the ring span 28 is formed at the inner end of the hollow hole 33a.
A protrusion 33b is formed that protrudes downward so as to engage with the upper surface of d. 34 is a cutter for machining the internal teeth 29a on the workpiece 29.

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.

Airport 35b formed in 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 explained.

Air is supplied to the air port 35b and is ejected from the pinhole 27 through the air passage 22c. Next, the workpiece 29 is placed on the workpiece receiving surface 26a by passing through the hollow hole 33a of the rounding plate 33 and the hollow hole 28a of the ring span 28 by a robot hand (not shown), and the workpiece 29 is placed on the workpiece receiving surface 26a.
Supply pressure oil to a. This pressure oil is supplied to the cylinder chamber 32 through the oil passage 22b, and as the cylinder tube 30 descends against the spring 23, the rounding plate 33 also descends. The protrusion 33b of the round tightening plate 33 pushes down the inner end 28d of the ring span 28, and thereby the ring span 2
8, the inner end 28d side deforms downward with the outer end 28b as a fulcrum. Since the ring span 28 has a spring characteristic similar to that of a disc spring, it presses the workpiece 29 inward from the inner end 28d side to center it, and at the same time presses it against the workpiece receiving surface 26a. At this time, the pinhole 27 is completely closed by the workpiece 29, and a pressure sensor provided in an air circuit (not shown) is turned on. For example, the ON signal of this sensor causes a buzzer or a lamp to blink to notify completion of centering and clamping of the workpiece 29.

Thereafter, the internal teeth 29a are cut using the cutter 34. At this time, since the inner end 28cl of the ring span 28 clamps the workpiece 29 in the vicinity of the gear-cutting part, chatter due to machining does not occur, and a good cut surface can be obtained.

Moreover, since the inner circumferential surface on the inner end 28d side and the outer circumferential surface of the workpiece 29 are clamped without a gap, accurate centering is possible, and as a result, highly accurate internal teeth 29a can be machined. be done. Next, the chips cut out by the cutter 34 fall onto the groove 25a whose upper part is completely open, and are reliably and smoothly discharged to the outside through the groove 22a along with the cutting oil. .

After 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 pressure on the ring span 28 by the protrusion 33b of the rounding plate 38 is released. The ring span 28 is restored to its original shape, and the workpiece 29 is unclamped. The workpiece 29 is removed by a robot hand (not shown), and the next workpiece can be placed on the receiving surface 26a.

When replacing the workpiece 29 in this way, there is no need to manually remove fixing tools or the like as in the conventional case, and the workpiece can be easily replaced automatically.

Furthermore, when the work 29 is removed, the inner end 28d
is located outside the work 29, so the inner end 28d
Chips will not adhere to the surface. As a result, it is only necessary to clean the inside of the jig with cutting oil, and cleaning of the inside of the jig can also be automated.

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

G6 As described in detail in the invention, 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. In addition to centering the workpiece and clamping it to the receiving surface, we also provided a groove that communicates the inside of the hollow body with the outside, making it easy to automate the workpiece loading and unloading, and make the clamping point axially close to the internal tooth machining area. This enables high-precision internal tooth machining, and chips and the like easily fall into the hollow body and are reliably discharged to the outside.

[Brief explanation of the drawing]

Figures 1 to 3 show one embodiment of the present invention.
2 is an exploded perspective view thereof, FIG. 3 is a plan view of a ring span, and FIG. 4 is a sectional view showing a conventional workpiece mounting jig for cutting internal gears. 22: Table 22a, 25a: Concave groove 23 spring 26a: Work receiving surface 27: Pinhole 28 Nilingespan 29: Work 3
0 Niji Linda tube 32 Niji Linda chamber 33:
Rounding plate 33b = protrusion

Claims (1)

[Claims] A base; an inner hollow body fixed to the base and having a receiving surface on its upper surface for placing a workpiece; and a cylinder inserted into the hollow body between the hollow body and the base. an outer hollow body that forms a chamber and moves in one direction by sliding on the outer peripheral surface of the inner hollow body with pressure oil introduced into the cylinder chamber, and is biased in the other direction by an elastic body; A ring-shaped workpiece holder provided on the inner hollow body, the workpiece is accommodated on the inner circumferential side of the ring, and the inner circumferential edge is deformed toward the receiving surface to center the workpiece and clamp it to the receiving surface. and a pushing member that presses and deforms the inner peripheral edge of the workpiece holding member by the movement of the outer hollow body,
A workpiece mounting jig for internal gear cutting, characterized in that a groove is formed to discharge chips and the like on the upper surface of the base surrounded by the inner hollow body to the outside.