TWI644755B - Indexing chuck - Google Patents

Abstract

The indexing chuck comprises a clamping seat, an indexing shaft, a piston and a positioning shaft. The indexing shaft is rotatably disposed in the clamping seat, and the piston is reciprocally movable in the clamping seat, and the positioning shaft can be The piston is disposed in the clamping seat along the axial direction thereof, wherein the piston has a first oblique guiding portion, and the positioning shaft has a second oblique guiding portion, the first and the second oblique direction therebetween The guiding portions are snapped together, so that the positioning shaft is driven by the piston during the movement of the piston to approach or move away from the indexing axis, thereby achieving the effect of positioning the workpiece or releasing the workpiece. It can be seen from the above that the indexing chuck of the present invention can not only simplify the structure to reduce the cost, but also can use the cooperation between the first and second oblique guiding portions to increase the holding force of the positioning shaft to the workpiece when subjected to centrifugal force. .

Description

Indexing chuck

The present invention relates to a lathe chuck, and more particularly to an indexing chuck that can effectively simplify the structure.

The so-called indexing chuck mainly uses the telescopic ejector to hold the workpiece on the indexing axis. After each process is completed, the angle of the workpiece relative to the tool is adjusted by the indexing axis. The next process can be carried out directly without recalibrating the position of the workpiece, thereby solving the problem of precision caused by the repeated disassembly and assembly of the workpiece.

As far as conventional technology is concerned, the ejector achieves the effect of elongation and shortening through the interaction between the rack and the worm and the worm, but these transmission parts increase the structural complexity, which leads to an increase in manufacturing cost.

SUMMARY OF THE INVENTION A primary object of the present invention is to provide an indexing chuck that simplifies the structure to reduce manufacturing costs.

In order to achieve the above object, the indexing chuck of the present invention comprises a clamping seat, an indexing shaft, and a positioning assembly. The center of the holder has a workpiece receiving groove, and the holder has an indexing shaft groove communicating with the workpiece receiving groove and a positioning axis communicating with the workpiece receiving groove on opposite sides of the workpiece receiving groove. a groove, in addition, the clamping seat further has a piston groove radially communicating with the positioning shaft groove; the indexing shaft is rotatably disposed in the indexing shaft groove of the clamping seat for driving the workpiece to rotate for angle adjustment The positioning assembly has a piston and a positioning shaft, the piston is horizontally movably disposed in the piston groove of the clamping seat and has a first oblique guiding portion, the positioning shaft is movably disposed along the axial direction thereof The positioning slot of the clamping seat has a second oblique guiding portion, and the first oblique guiding portion of the piston and the second oblique guiding portion of the positioning shaft are engaged with each other, so that the positioning The shaft can be moved toward or away from the indexing axis by the movement of the piston in the piston groove to achieve the effect of positioning the workpiece or releasing the workpiece.

As apparent from the above, the indexing chuck of the present invention drives the positioning shaft to advance or retreat by means of the inclined surface guiding, and the various transmission components used in the prior art are omitted in terms of structure, so that the purpose of simplifying the structure can be surely achieved.

More preferably, the first oblique guiding portion protrudes from the outer circumferential surface of the piston, and the second oblique guiding portion is recessed from the outer circumferential surface of the positioning shaft. Thereby, after the first and second oblique guiding portions are engaged with each other, the positioning shaft achieves the effect of advancing and retreating by lateral movement of the piston.

More preferably, the first oblique guiding portion of the piston has a first end and a second end, and the distance between the first end and the workpiece receiving groove of the clamping seat is greater than the second end and the clip a distance between the workpiece receiving grooves of the seat, when the second oblique guiding portion of the positioning shaft is located at the first end of the first oblique guiding portion of the piston, the positioning axis is located at the positioning axis of the clamping seat In the slot, the workpiece can be mounted on the indexing shaft at a time, and when the second oblique guiding portion of the positioning shaft is located at the second end of the first oblique guiding portion of the piston, the positioning shaft extends The clamping seat is positioned outside the positioning slot, and the positioning axis will hold the workpiece to complete the positioning. After the positioning of the workpiece is completed, the positioning shaft moves under the centrifugal force toward the second end of the first oblique guiding portion of the piston, so that the positioning shaft can increase the holding force of the workpiece. In order to achieve the purpose of improving processing stability.

The detailed construction, features, assembly or use of the indexing collet provided by the present invention will be described in the detailed description of the subsequent embodiments. However, it should be understood by those of ordinary skill in the art that the present invention is not limited by the scope of the invention.

Referring to Figures 1 and 2, the indexing collet 10 of the present invention includes a clamping seat 20, an indexing shaft 30, and a positioning assembly 40.

The holder 20 has a body 21 and a cover 22 which is disposed on the base 21. The center of the base 21 has an elongated groove 211. The cover 22 has an opening 221, and the opening 221 of the cover 22 is connected. The elongated grooves 211 of the seat body 21 are such that the two together form a workpiece receiving groove 23. The base body 21 has a first arc groove 213 connecting the elongated groove 211 and a second arc groove 215 connecting the elongated groove 211 on opposite sides of the elongated groove 211, and the cover 22 is at The two opposite sides of the opening 221 respectively have a third arc slot 223 connecting the opening 221 and a fourth arc slot 225 of a communication opening 221, and the first arc slot 213 of the seat body 21 corresponds to the third arc slot 223 of the cover 22, An indexing shaft groove 24 is formed between the two, and the second arc groove 215 of the seat body 21 corresponds to the fourth arc groove 225 of the cover body 22, so that a connecting workpiece is formed between the two. The positioning shaft groove 25 of the groove 23 is disposed coaxially with the positioning shaft groove 24 and the positioning shaft groove 25. In addition, the seat body 21 further has a piston groove 26 and an end plug 27. The extending direction of the piston groove 26 is parallel to the extending direction of the workpiece receiving groove 23, and the center of the piston groove 26 is in radial communication with the positioning shaft groove 25. The end plug 27 is provided at one end of the piston groove 26 for closing the piston groove 26.

The indexing shaft 30 is rotatably disposed in the indexing shaft groove 24 of the clamping seat 20 for fixing the workpiece 12 so that the workpiece 12 can be angularly adjusted by the rotation of the indexing shaft 30.

The positioning assembly 40 has a piston 50 and a positioning shaft 60. The piston 50 is disposed in the piston groove 26 of the clamping seat 20 and can horizontally reciprocate between the two ends of the piston groove 26 by the action of fluid pressure. The positioning shaft 60 can be disposed on the clamping seat 20 along the axial movement of itself. Positioned in the shaft groove 25. As shown in FIG. 3, the outer circumferential surface of the piston 50 protrudes from the first oblique guiding portion 51, and the outer circumferential surface of the positioning shaft 60 is recessed with a second oblique guiding portion 61. The piston 50 and the positioning shaft 60 The first and second oblique guiding portions 51, 61 are coupled to each other, wherein the length of the first oblique guiding portion 51 of the piston 50 is greater than the second oblique guiding portion of the positioning shaft 60. The first oblique end portion 51 of the piston 50 has a first end 52 and a second end 53. The distance between the first end 52 and the workpiece receiving groove 23 is greater than the second end 53 and the workpiece capacity. The distance between the slots 23 is set.

As can be seen from the above, as shown in FIG. 4, when the piston 50 is located at the left end of the piston groove 26, the second oblique guiding portion 61 of the positioning shaft 60 is located at the first end of the first oblique guiding portion 51 of the piston 50. 52, the positioning shaft 60 is not extended beyond the positioning shaft groove 25 of the clamping seat 20, and the user can place the workpiece 12 in the workpiece receiving groove 23 of the clamping seat 20 and fix it to the indexing shaft 30.

After the fixing of the workpiece 12 is completed, as shown in Fig. 5, the piston 50 is pushed by the fluid pressure from the left end of the piston groove 26 to the right end of the piston groove 26, and guided by the second oblique direction during the movement of the piston 50. The portion 61 pushes the first oblique guiding portion 51 of the positioning shaft 60 such that the positioning shaft 60 gradually protrudes out of the positioning shaft groove 25 until the second oblique guiding portion 61 of the positioning shaft 60 is located at the first oblique direction of the piston 50. When the second end 53 of the guiding portion 51 is used, the positioning shaft 60 holds the workpiece 12 to the top. At this time, the positioning of the workpiece 12 is completed, and then the workpiece 12 can be driven to rotate relative to the tool (not shown). The tool cuts the workpiece 12.

During the rotation of the workpiece 12 together, the centrifugal force received by the positioning shaft 60 itself causes the positioning shaft 60 to move toward the second end 53 of the first oblique guiding portion 51 of the piston 50, so that the centrifugal force continues to act. In the meantime, the positioning shaft 60 can increase the holding force on the workpiece 12, so that the workpiece 12 can further improve the stability, thereby obtaining good machining accuracy.

In summary, the indexing chuck 10 of the present invention uses the inclined surface guiding manner to drive the positioning shaft 60 to advance or retreat. On the one hand, the various transmission components used in the prior art are omitted, thereby achieving the effect of simplifying the structure. On the one hand, in the processing of the workpiece 12, the stability can be increased by the action of the centrifugal force, thereby achieving the purpose of improving the machining accuracy.

10 indexing chuck 12 workpiece 20 clamping seat 21 seat body 211 elongated groove 213 first arc groove 215 second arc groove 22 cover body 221 opening 223 third arc groove 225 fourth arc groove 23 workpiece receiving groove 24 Indexing shaft groove 25 positioning shaft groove 26 piston groove 27 end plug 30 indexing shaft 40 positioning assembly 50 piston 51 first oblique guiding portion 52 first end 53 second end 60 positioning shaft 61 second oblique guiding portion

Fig. 1 is a perspective view showing the appearance of the indexing chuck of the present invention. Figure 2 is an exploded perspective view of the indexing chuck of the present invention. Figure 3 is an exploded perspective view of the positioning assembly provided by the indexing collet of the present invention. Figure 4 is a partial plan cross-sectional view of the indexing chuck of the present invention, mainly showing the state in which the workpiece is mounted on the indexing shaft. Fig. 5 is another partial plan sectional view showing the indexing chuck of the present invention, mainly showing the state in which the positioning shaft positions the workpiece. Figure 6 is similar to Figure 5 and mainly shows the state when the indexing chuck drives the workpiece to rotate.

Claims (7)

An indexing chuck includes: a clamping seat having a workpiece receiving groove, wherein the clamping seat has a connecting shaft groove communicating with the workpiece receiving groove on one of two opposite sides of the workpiece receiving groove The workpiece accommodating the positioning groove of the groove, the clamping seat further has a piston groove radially communicating with the positioning shaft groove; an indexing shaft rotatably disposed in the indexing shaft groove of the clamping seat; and a positioning The assembly has a piston and a positioning shaft, the piston is horizontally movably disposed in the piston groove of the clamping seat and has a first oblique guiding portion, and the positioning shaft is axially movable along the clamping body The positioning slot of the seat has a second oblique guiding portion, and the first oblique guiding portion of the piston and the second oblique guiding portion of the positioning shaft are engaged with each other, so that the positioning shaft can be The indexing axis approaches or moves away from the indexing axis by the horizontal movement of the piston. The indexing chuck of claim 1, wherein the outer circumferential surface of the piston protrudes from the first oblique guiding portion, and the outer circumferential surface of the positioning shaft is recessed by the second oblique guiding portion. The indexing chuck of claim 1, wherein the first oblique guiding portion of the piston has a first end and a second end, the first end being between the workpiece receiving groove of the holder The distance is greater than a distance between the second end and the workpiece receiving groove of the holder. When the second oblique guiding portion of the positioning shaft is located at the first end of the first oblique guiding portion of the piston, the distance is The positioning shaft is located in the positioning shaft groove of the clamping seat, and when the second oblique guiding portion of the positioning shaft is located at the second end of the first oblique guiding portion of the piston, the positioning shaft extends out of the clamping seat Position outside the shaft groove. The indexing chuck of claim 3, wherein when the second oblique guiding portion of the positioning shaft is located at the second end of the first oblique guiding portion of the piston, the positioning shaft is received by itself The rotating centrifugal force acts to maintain the second end of the first oblique guiding portion of the piston. The indexing chuck of claim 1, wherein the indexing axis groove and the positioning shaft groove are coaxially corresponding. The indexing chuck of claim 1, wherein the extending direction of the workpiece receiving groove is parallel to the extending direction of the piston groove. The indexing chuck of claim 1, wherein the length of the first oblique guiding portion is greater than the length of the second oblique guiding portion.