JPH0318106Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The present invention is a method of centering an annular workpiece and firmly holding the workpiece in order to incorporate other parts into the workpiece or machine it. The present invention relates to a positioning clamp device.

<Prior Art> A conventional positioning clamp device for an annular workpiece involves fitting the inner diameter of the workpiece into a cylindrical guide member having an outer diameter that is approximately the same as the inner diameter of the workpiece, and a drawbar provided at the center of this guide member. It is known that a clamp arm automatically opens and clamps a workpiece by lowering the clamp arm.

[Problems to be solved by the invention] However, in the positioning clamp device for an annular workpiece as described above, since the inner diameter of the workpiece and the outer diameter of the cylindrical guide member are almost equal, it is difficult to attach and detach the workpiece to and from the guide member smoothly. Moreover, since there is a small clearance between the inner diameter of the workpiece and the outer diameter of the guide member, there is a problem that accurate centering cannot be performed.

The present invention was developed in view of the above-mentioned problems, and its purpose is to provide a positioning clamp for annular workpieces that has an extremely simple workpiece fitting device and that can reliably center the workpiece in a predetermined position. We are in the process of providing equipment.

<Means for Solving the Problems> In order to achieve the above object, the annular workpiece positioning clamp device according to the present invention includes a cylindrical holder into which the annular workpiece is inserted, and a receptacle for receiving the workpiece. A stand is provided, and a plurality of tension pieces and a plurality of L-shaped clamp arms are disposed on the peripheral edge of the cylindrical holder so as to be freely retractable. A drawbar is attached to the center of the cylindrical holder so as to be movable in the axial direction, and a slide cam having a cam surface that can engage with the tension piece and the inside of the clamp arm is inserted into the drawbar. An elastic member is provided between the drawbar and the slide cam to bias the slide cam when the drawbar is retracted. In addition, an arm support ring for pivotally connecting the clamp arm is disposed in the lower part of the cylindrical holder so as to be movable in the axial direction, and the arm support ring has a ring so as to move along with the drawbar during the retraction operation of the drawbar. An engaging portion for engagement is provided.

<<Operation>> First, when the annular workpiece is attached, the drawbar is raised and the tension piece and clamp arm are located on the same plane as the outer circumference of the cylindrical holder or inside it. When the annular workpiece is inserted into the cylindrical holder in this state, the annular workpiece is supported by the pedestal and held horizontally. Next, when the drawbar is lowered, the cam surface of the slide cam attached to the drawbar engages with the inner ends of the plurality of tension pieces and the plurality of clamp arms, causing these tension pieces and clamp arms to protrude outward from the cylindrical holder. let By simultaneously projecting the plurality of tension pieces outward and pressing against the inner diameter of the annular workpiece, the annular workpiece is positioned concentrically with the cylindrical holder and centered. It is held in a semi-clamped state. When the drawbar is further lowered from this state, it engages with the drawbar from the arm support ring and moves with it, thereby lowering the clamp arm pivotally connected to the arm support ring. It is firmly clamped between it and the tip of the arm. After assembling parts or performing mechanical processing on the annular workpiece in this clamped state, when the drawbar is raised, the force pushing the tension piece and clamp arm outward is removed, and the finished annular workpiece is The cylindrical holder can be easily removed and a new annular workpiece can be attached to the apparatus of the present invention for processing.

<<Example>> Below, a positioning and clamping device for an annular workpiece according to a preferred embodiment of the present invention will be described in detail.

In the figure, reference numeral 1 indicates a fixed base, and a lower end flange portion 2a of a cylindrical holder 2 is fixed to an annular upper end surface of the fixed base 1. This flange part 2a
An annular pedestal 3 is attached to the top surface, and the top end of this pedestal 3 surrounds the cylindrical portion 2b of the cylindrical holder 2 at a distance of about 1,000 feet, and its top end surface is a horizontal surface. There is.

The upper end surface of the cylindrical holder 2 is closed by a top plate 4, and the inside thereof is hollow. Three through holes 5 are formed at equal intervals in the circumferential direction in the cylindrical portion 2b of this cylindrical holder 2, and tension pieces 6 are placed in each through hole 5.
is inserted and fitted so as to be slidable in the radial direction. Also,
Three longitudinal holes 7 are formed at equal intervals in this cylindrical portion 2b, and each longitudinal hole 7 is located in the center of the two through holes 5. Then, an inverted L-shaped clamp arm 8 with the upper part as the short side is inserted into each vertically long hole 7,
The upper clamp 8a of this clamp arm 8 can freely extend and retract from the vertically elongated hole 7 in the radial direction.

A draw bar 9 is disposed at the center of the interior of the cylindrical holder 2 so as to be movable up and down, and a slide cam member 10 is inserted through the draw bar 9. An end plate 11 is screwed to the upper end of the drawbar 9, and three first compression springs 12 are provided between the end plate 11 and the slide cam member 10, which are arranged at equal intervals in the circumferential direction. The slide cam member 10 is always urged downward by the spring 12. A first tapered cam surface 13 is formed on the circumferential surface of the slide cam member 10 at a position facing each tension piece 6, and a second tapered cam surface 13 is formed at a position facing each L-shaped clamp arm 8. A tapered cam surface 14 is formed. And the second
The tapered cam surface 14 is formed to extend downward from the first tapered cam surface 13.
Note that the corner of the tension piece 6 facing the first tapered cam surface 13 is formed to have the same inclination angle as this cam surface 13. An annular collar member 15 is attached to the shaft of the drawbar 9 below the slide cam member 10, and a drawbar 9 is attached to the lower end of the drawbar 9.
A screw 16 is formed which is screwed into the device part that drives the.

An arm support ring 17 is vertically movably disposed between the lower end flange portion 2a of the cylindrical holder 2 and the fixed base 1, and the lower end of the clamp arm 8 is attached to the peripheral edge of the ring 17 by a pin 18. It is pivoted. Further, between this ring 17 and the fixed base 1, three second compression springs 19 are arranged at predetermined intervals.
The ring 17 is always elastically biased upward. The drawbar 9 is inserted into the central through hole 20 of this arm support ring 17.
The annular collar member 15 of the drawbar 9 is located above the drawbar 9. The outer diameter of this annular collar member 15 is formed larger than the diameter of the central through hole 20, so that when the drawbar 9 descends, this annular collar member 15
5 and the arm support ring 17 will engage and descend together.

A horizontal hole is formed in the lower end flange portion 2a of the cylindrical holder 2 at a position facing the L-shaped clamp arm 8, and a third compression spring 22 is housed in the hole by a screw plug 21. The mold clamp arm 8 is always urged toward the inside of the cylindrical holder 2. Further, the lower end of a leaf spring member 23 is screwed onto the lower part of the tension piece 6 in the cylindrical portion 2b of the cylindrical holder 2, and the upper part of this leaf spring member 23 presses against the outer surface of the tension piece 6 to hold it. It is constantly biased inward.

The clamp device according to the above embodiment of the present invention centers and fixes the annular work 24 as shown, for example, the casing of a torque converter, concentrically with the cylindrical holder 2, and fixes the annular work 24 as shown in the figure, for example, the casing of a torque converter, by centering it concentrically with the cylindrical holder 2.
This is to enable automatic processing of blades, such as fitting or welding blades into the casing of a torque converter.
The operation of the clamp device will be explained below.

First, as shown in FIG. 1, when the draw bar 9 is raised and the slide cam member 10 is positioned upward, the L-shaped clamp arm 8 is tilted inward by the third compression spring 22. The upper end clamp portion 8a is located on the same cylindrical surface as the cylindrical portion 2b of the cylindrical holder 2, and the tension piece 6 is also located on the plate spring member 23.
Therefore, it is located on the same cylindrical surface as the cylindrical portion 2b of the cylindrical holder 2. In this state, the annular work 2
4 Insert the central opening into the cylindrical holder 2 from above,
This work 24 is supported on the pedestal 3. still,
It is preferable that the outer diameter of the cylindrical portion of the cylindrical holder 2 is made sufficiently smaller than the central opening of the workpiece 24 to facilitate insertion of the workpiece into the holder 2.

When the drawbar 9 is pulled downward from the state shown in FIG. The clamp part 8a hits the inner corner of the arm 8 and tilts outward against the third compression spring 22, thereby moving the clamp part 8a toward the upper surface of the workpiece 24 on the receiving table 3. Following this, the first tapered cam surface 13 formed on the slide cam member 10
When the tension piece 6 hits the upper and inner inclined surface of the tension piece 6,
protrude outward. These tensioning pieces 6 are of the same shape and are provided at equal intervals at three locations on the periphery of the cylindrical holder 2, and these tensioning pieces 6 are simultaneously projected outward.
is positioned coaxially with the cylindrical holder 2. When this tension piece 6 is caused to project outward by the first cam surface of the slide cam member 10 and the centering of the annular workpiece 24 is completed, the L-shaped clamp arm 8 also moves outward by a predetermined angle. The clamp part 8a is pressed against the upper surface of the workpiece 24 on the receiving table 3.
This pressing force is obtained only by tilting the clamp arm, and the workpiece 24 is in a semi-clamped state which is not sufficient for subsequent machining of the workpiece 24.

When the drawbar 9 is further lowered from this half-clamped state, as shown in FIG.
An annular collar member 15 integrally attached to the arm engages the arm support ring 17 and causes the arm support ring 17 to be lowered together with the drawbar 9 against the second compression spring 19. When the arm support ring 17 descends in this way, the crank arm 8 whose lower end is pivotally attached to it also descends at the same time, so that the clamp portion 8a of the crank arm 8 exerts a vertical force on the workpiece 24 on the pedestal 3. Because of this, the workpiece 24 can be clamped in a firmly centered state so that it does not shift in position during subsequent processing.

To release the clamp after processing the workpiece 24, the drawbar 9 may be raised. That is, when the drawbar 9 is raised, the first and second tapered cam surfaces 1 of the slide cam member 10
3 and 14 are separated upward from the tension piece 6 and the clamp arm 8, the tension piece 6 and the clamp arm 8 are moved inward by the action of the leaf spring member 23 and the third compression spring 22, respectively. In order to occupy the state shown in Fig. 1, the workpiece 24
can be easily pulled out above the cylindrical holder 2.

<<Effects>> As described above, according to the positioning and clamping device for an annular work according to the present invention, the annular work can be reliably centered and clamped to the cylindrical holder by one action of lowering the drawbar, thereby achieving automation. It is a simple device suitable for

Furthermore, by making the outer diameter of the cylindrical holder sufficiently smaller than the diameter of the central opening of the annular workpiece, it can be easily inserted into and removed from the clamping device, resulting in extremely good operability. .

[Brief explanation of the drawing]

The figures show a positioning and clamping device for an annular workpiece according to the present invention, in which FIG. 1 is a sectional view in an unclamped state, and FIG. 2 is a sectional view in a clamped state. 2... Cylindrical holder, 3... Rest, 6... Tension piece, 8... Clamp arm, 9... Draw bar, 10... Slide cam member, 12, 19, 2
2... Compression spring, 13, 14... Cam surface,
17... Arm support ring, 24... Annular workpiece.

Claims (1)

[Scope of utility model registration request] A holder for receiving the annular work is provided on the outer periphery of a cylindrical holder through which the annular work is inserted, and a plurality of tension pieces and a plurality of L-shaped clamp arms are arranged on the periphery of the cylindrical holder so as to be freely retractable. At the same time, a drawbar is attached to the center of the drawbar so as to be movable in the axial direction, and a slide cam having a cam surface that can be engaged with the inside of the tension piece and the clamp arm is inserted into the drawbar, and the drawbar and the slide cam are connected to each other. An elastic member is provided between the cylindrical holder and the slide cam to bias the slide cam when the drawbar is retracted, and an arm support ring that pivotally connects the clamp arm is disposed below the cylindrical holder so as to be movable in the axial direction. A positioning and clamping device for an annular workpiece, characterized in that the arm support ring has an engaging portion that engages with the drawbar so as to move with the drawbar during a retracting operation of the drawbar.