JPS6344485B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an indexing chuck for a machine tool that performs predetermined indexing in stages during rotation.

Such indexing chucks are known and have a plurality of plungers that act on the corners of the indexing mechanism. This indexing chuck has a machining surface of 1
It is used for workpieces that are orthogonal in two planes, allows for economical and precise machining, and has achieved good results in a number of different machining purposes. However,
In the valve box of the workpiece gate valve shown as an example in Fig. 4, the workpieces are clamped to the clamping claws of the indexing chuck in machining sections A, B, and C, and the indexing for each machining section is performed by the indexing chuck. Although this is possible during rotation, this valve box has machined parts D and E of the valve seat, making it impossible to index the inclination of these parts and machining them simultaneously. As a solution to this problem, the special public
19158 is known, and this chuck is provided with an additional protrusion in addition to the above-mentioned known indexing chuck, and the protrusion is pushed up from the lower surface of one of the plurality of clamp claws to perform tilt indexing. Therefore, the chuck itself is inevitably large in size, has a complicated structure, and is expensive. Furthermore, due to the large size, the machining rotational speed must be low.

The present invention solves these problems by adding an inclined indexing surface to the indexing surface of the square separator in an indexing chuck having a plurality of plungers that act on the square separators of the conventional indexing mechanism. An indexing chuck for a machine tool, characterized in that an inclined plunger is slidably engaged inside a main plunger that contacts an indexing surface of a square piece, and the inclined plunger is brought into contact with an inclined indexing surface of a square piece. provide.

In explaining the present invention, the basic structure and operation of the indexing chuck will be explained with reference to FIGS. 1 to 3 in order to facilitate understanding of its operation.

FIG. 1 shows a schematic overall view of an indexing chuck 1, which is fixed via a mounting face plate 5 to a spindle 2 of a machine tool (not shown). An oil distribution device 3 is attached to the rear end of the spindle 2, and pressure oil is supplied from a pressure oil supply device (not shown), and the indexing chuck 1 is moved in stages from the oil distribution device 3 through an oil feed pipe 4. The necessary pressure oil is supplied. From the general view shown in FIG.
The structure of the indexing chuck 1 with a is seen. A clamping mechanism 9 and an indexing mechanism 10 are embedded in opposite sides of the chuck body 6, and have clamping claws 7 and 8 attached thereto, respectively. In the illustrated embodiment, the valve body of the gate valve is clamped as a workpiece between the clamping claws 7 and 8 and is rotated by the spindle 2 for machining by a machine tool.

2 and 3 show the X section of FIG. 1, and the square separator 10a of the indexing mechanism 10 is
A method is shown in which the two plungers 13, 14 are indexed step by step. The main plunger 13 and the auxiliary plunger 14 work together with an indexing angle separator made of four edges, so that each plunger 13 and 14 produces a movement in 45° increments. FIG. 2 shows the square sesame 1 of the indexing mechanism 10.
0a indicates a position rotated by 45 degrees by the auxiliary plunger 14. When the auxiliary plunger 14 retreats from the position shown in FIG. 2 and the square separator 10a moves by 45 degrees as the main plunger 13 moves forward, the square separator 10a is in the position shown in FIG.

The movement of the main plunger 13 and the auxiliary plunger 14 is effected by the above-mentioned pressure oil, which is sent from the oil distribution device 3 to the indexing chuck 1 via the oil pipe 4 in the hollow spindle 2. Both plungers 13 and 14 have piston-like large diameter parts at their ends, constitute cylinders on which pressure oil acts on both sides of the large diameter parts, and are sealed by lids 16 and 17, respectively. . It can be seen that the workpiece W clamped between the clamping claws 7 and 8 is located in the cavity of the chuck body 6, which is configured in the shape of a pot, and can be indexed in stages by the indexing mechanism 10.

Next, embodiments of the present invention shown in the drawings will be described. FIG. 5 is a sectional view based on the present invention corresponding to the X section in FIG. 12b
An inclined indexing surface of 12d is also formed. 6th
The figure shows this indexing surface in the Y cross section of FIG. Reference numeral 13a denotes a main plunger, and when its tip abuts against the indexing surface of the square piece 10a, the indexing mechanism 10 is indexed in one predetermined stage. Reference numeral 25 denotes a guide pin for the main plunger 13a provided on the chuck body 6, which engages with a guide groove 24 of the main plunger 13a to position the main plunger 13a in correct contact with each indexing surface of the square piece 10a. be. Reference numeral 15 denotes a tilting plunger, which is coaxially and slidably engaged inside the main plunger 13a, and has a piston-like large diameter portion at its end, and pressure oil acts on both sides of this large diameter portion. 27 is lid 1
Positioning guide pins attached to 6 and 17 engage guide grooves 26 provided in the chuck body 6 to position the respective lids. Reference numeral 23 designates one or more guide shafts provided on the lids 16 and 17, which guide the auxiliary plunger 14 and the tilting plunger 15 and prevent them from rotating. FIG. 7 illustrates this part, and is a Z view of FIG. 5.

The operation will be explained step by step based on FIG. 5 and FIGS. 8 to 17.

FIG. 5 shows a state in which the first stage of indexing corresponding to FIG. Ru. At this time, pressure oil is supplied to the oil ports 19 and 21.

FIG. 8 shows that when pressure oil is supplied to the oil ports 18 and 22, the main plunger 13a retreats and the auxiliary plunger 14 moves forward, so that the auxiliary plunger 14 comes into contact with the indexing surface 11b of the square separator 10a. is moving by 45°. As a result, the workpiece is also tilted. Pressure oil is supplied to oil ports 18 and 22, and at the same time, pressure oil in the cylinder is released from oil ports 19 and 21. In the following explanation, this escape of pressure oil will be omitted.

FIG. 9 shows that with pressure oil being supplied to the oil ports 19 and 21, the auxiliary plunger 14 is retracted, the main plunger 13a is advanced, and the indexing surface 11 of the square separator 10a is
b, the square sesame 10a moves by 45° and the first
The stage identification has been completed. Part B of the workpiece is machined.

In FIG. 10, pressure oil is supplied to the oil port 18 and the main plunger 13a is retracted.

In FIG. 11, pressure oil is supplied from the oil port 20. Therefore, the tilting plunger 15 moves forward simultaneously with the main plunger 13a. Tilt plunger 15
The tip of the main plunger 13a is designed to face outward from the tip of the main plunger 13a.
The tip of 5 is the inclined indexing surface 12a of the square sesame 10a.
The inclination index of θD° is performed by contacting the . Portion D of the workpiece W is machined.

FIG. 12 shows a state in which the corner piece 10a has moved 45 degrees due to the retreat of the main plunger 13a and the advance of the auxiliary plunger 14, and corresponds to FIG. 8 described above.

In FIG. 13, the second stage indexing is completed by the retreat of the auxiliary plunger and the advance of the main plunger 13a. This corresponds to FIG. 9 described above.

FIG. 14 shows a state in which the main plunger 13a is retracted, the auxiliary plunger 14 is advanced, and the square piece 10a has moved by 45 degrees, and corresponds to the above-mentioned FIG. 8.

In FIG. 15, the third stage of indexing is completed with the auxiliary plunger 14 retracting and the main plunger 13a advancing. This corresponds to Fig. 9, and the workpiece W
, part C is processed.

FIG. 16 corresponds to FIG. 10 with the main plunger 13a in a retracted state.

FIG. 17 shows a state in which the tilting plunger 15 and the main plunger 13a move forward at the same time and the auxiliary plunger 14 remains retracted, and the tilting plunger 15 comes into contact with the tilting indexing surface 12d of the square separator 10a, and the square separator 10a θE° tilt. Therefore, the workpiece W is also tilted by θE° and the E section is machined.

In the case of an indexing chuck in which indexing is performed in predetermined steps using a chuck for a machine tool, as shown in the machining of the valve seat of the valve body of the gate valve shown in Figure 4,
For workpieces whose machining parts are not perpendicular to each other in one plane, it is impossible to machine the non-orthogonal machining parts, and machining is performed using a separate special machining jig, which increases the number of man-hours and processes, leading to an increase in costs. . In addition, when using the chuck of the above-mentioned Japanese Patent Publication No. 19158-1915, it is possible to process the valve seat part, but the chuck body is large, complicated, and expensive, and it is difficult to process the chuck, especially for small workpieces. Since the corresponding machining rotation cannot be performed, satisfactory machining accuracy cannot be obtained and the machining time also takes a long time. The present invention solves these problems and is achieved by improving the conventional chuck, and not only performs the conventional predetermined stepwise indexing, but also performs the valve seat machining without clamping the workpiece. It can be processed as is, and there is no need for special jigs. Furthermore, the ability to change the adjustment of the tilt angle by replacing the square piece and the tilt plunger is a feature not found in conventional products. Of course, the workpiece is not limited to the valve box of a gate valve, and can be used to process a wide variety of other multipurpose workpieces.

[Brief explanation of the drawing]

1 to 3 are schematic explanatory views of the indexing chuck. FIG. 1 is an overall view showing a cross section of the main part, and FIGS. 2 and 3 are an X section of the plunger in FIG. 1. A drawing showing movement. FIG. 4 is a drawing showing a processed part of a valve box of a gate valve as an example of a workpiece.
FIG. 5 is a view corresponding to the X section of FIG. 1 of the indexing chuck according to the present invention. Figure 6 shows Y in Figure 5.
A drawing showing a square sesame in cross section. FIG. 7 is a Z-view drawing of FIG. 5. FIGS. 8 to 17 are drawings for explaining the indexing operation, and each of the workpieces is shown in an indexed state as a schematic diagram of a valve box of a gate valve, and the processed portion is indicated by a thick line. 1...Index chuck, 6...Chuck body,
7, 8... Clamp claw, 9... Clamp mechanism, 1
0... Indexing mechanism, 10a... Square sesame, 11a,
11b, 11c, 11d... indexing surface, 12a,
12b...Tilt indexing surface, 13, 13a...Main plunger, 14...Auxiliary plunger, 15...Tilt plunger.

Claims (1)

[Claims] 1 having a plurality of replaceable clamping pawls, at least one of the clamping pawls being radially movable by a clamping mechanism for clamping a workpiece, the clamping pawls being movable along a plurality of axes; In order to machine a workpiece, the auxiliary plunger and the main plunger are alternately brought into contact with the indexing surface of the square separator of the indexing mechanism that drives at least one clamp claw together with the clamped workpiece to achieve a predetermined split. In an indexing chuck that performs indexing in stages, a tilting indexing surface is attached to the square sesame indexing surface of the indexing mechanism, and the tilting plunger can be slid inside the main plunger that comes into contact with a predetermined indexing surface. An indexing chuck for a machine tool, characterized in that the tilting plunger is brought into contact with the tilting indexing surface of a square piece.