JPH08318448A - Turntable of machine tool - Google Patents

Abstract

PURPOSE: To achieve the division, positioning, and clamping of a turntable in one action by fixing a clamping plate to a table bracket side at the division end, and fitting a clamp roller to hold the clamp plate from the top and the bottom to the turntable side. CONSTITUTION: A worm gear having the self-locking effect is employed in a dividing mechanism of a turntable 2, a stopper bolt 15 is hit at and stopped by a stopper 14 at the division end, and the small driving force is constantly given to a division drive shaft to complete the division, positioning, and clamp in the turning direction of the turntable 2 in one action. The clamp in the vertical direction is of the structure to hold the clamping plate 16 fixed to a table bracket 8 through the turning motion of the turntable 2 by a clamp roller 17 fitted to the turntable 2. The division, positioning, and vertical clamping of the turntable 2 are achieved thereby.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turntable for a machine tool, and more particularly to a machine tool for rotating a turntable to set a work and take out a product.

[0002]

2. Description of the Related Art Conventionally, in machine tools such as column traverse type or vertical type drilling tapping machines,
It has a table surface located outside the machining area for attaching and detaching the work piece and a table surface located in the machining area for machining the work piece. Those equipped with a turntable which makes a reciprocating turning motion of .degree. Are known. Such turntable reassignment requires at least three operations: indexing, positioning (turning direction and vertical direction), and clamping (turning direction and vertical direction).

A conventional worm gear, rack and pinion, low-speed high-torque motor or other drive mechanism is used as the indexing mechanism in this type of conventional turntable, and the drive force is turned off after the indexing operation is completed. Is common. As a positioning method, a stopper is applied, movement of the driving side is restricted, or another method is adopted. In many cases, the clamping method is also used for positioning, and there are methods such as engagement of the curvic coupling, insertion of a positioning pin, or conical coupling. Then, these various elements are combined to form a turntable, and in any case, the reassignment operation is the vertical movement of the table or the pin for releasing the clamp → the indexing operation → the coupling is engaged. Therefore, the vertical movement or the insertion of the positioning pin is required, and these operations are serial, and there is a limit to the replacement of the turntable and the reduction of the time required for positioning.

[0004]

SUMMARY OF THE INVENTION In a machine tool in which a turntable is rotated to set a work and take out a product, the turntable indexing, positioning, and clamp reassignment operations are performed. Operation (ON
It is possible to end by E ACTION) and shorten the reassignment time.

[0005]

Means for Solving the Problems In order to solve the above-mentioned problems, the means adopted by the present invention is a table surface for attaching and detaching a work located outside the machining area and a work surface located within the machining area. In a machine tool having a turntable that performs a 180 ° reciprocating reciprocating motion by arranging the revolving shafts in the center of both table surfaces for self-locking the revolving shaft and the indexing drive source. A stopper and a stopper bolt, which are connected to each other through a worm gear having an action and abut against each other at the indexing end, are arranged on the table bracket and the turntable, and the clamp plate is fixed to the table bracket side at the indexing end. A clamp roller that holds the clamp plate from above and below is attached to the turntable side.

[0006]

According to the turntable of the present invention, a worm gear having a self-locking action is used for the indexing mechanism of the turntable (2), and the stopper bolt (15) is fixed to the stopper (14) at the indexing end. , And indexing drive shaft (12)
By continuously applying a small driving force to the rotary table, the turntable (2) can be indexed and swung in the swivel direction and clamped in the swivel direction in a single operation.
In addition, for vertical clamping, the clamp plate (16) fixed to the table bracket (8) is clamped by the clamp roller (17) attached to the turntable (2) by the indexing movement of the turntable (2). Since the structure is attached, the vertical clamping can be completed in one operation at the same time as the indexing and positioning of the turntable (2).

[0007]

According to the present invention, the turntable (2)
Indexing and positioning, which are the main components of the reallocation operation of
It has become possible to achieve both (the turning direction and the vertical direction) and the clamp (the turning direction and the vertical direction) in one operation.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in detail below with reference to the drawings. In the figure, (1) shows a vertical drilling tapping machine, which is equipped with a turntable (2) of the present invention. The turntable (2) has a first table surface (2a) located outside the machining area and a second table surface (2b) located inside the machining area, and both table surfaces (2a) (2b). A swivel shaft (3) is supported at the center of (), and a 180 ° reciprocating swivel motion is possible. A tool magazine (4) containing a plurality of tools is arranged above the second table surface (2b), and the tool magazine (4) is rotated to index the desired tool (5) and attach it to the spindle. The work (6) on the second table surface (2b) can be processed. By rotating the turntable (2) and exchanging the first table surface (2a) and the second table surface (2b), the work and the product can be exchanged and taken out. The embodiment shown in the drawings applies the present invention to a vertical drilling tapping machine, but needless to say, it is also applicable to a column traverse drilling tapping machine and other machine tools.

Referring to FIGS. 5 and 6, (7) is a base of the drilling tapping machine, and a table bracket (8) is mounted in the base. The turntable
The rotating shaft (3) of (2) is inserted into a bearing tube (9) rotatably supported by the table bracket (8) and rotates integrally. A worm wheel (10) is rotatably mounted on the bearing tube (9), and an indexing drive shaft (12) is rotatably supported by the worm (11) meshing with the worm wheel (10). ) Is connected to an indexing drive source (13) such as a motor. By using a worm gear with self-locking action for the rotary indexing mechanism of the turntable (2), the indexing drive shaft (1
The turntable (2) can be indexed by rotating 2), and the drive shaft (12) is not rotated even when the turning force from the turntable (2) side acts.

Positioning of the turntable (2) in the turning direction is achieved by abutting a stopper bolt (15) on the indexing positioning stopper (14). 4, 7,
As shown in FIGS. 8, 11, and 12, stopper bolts (15) are fixed to the lower surface of the turntable (2) at two locations facing each other in the diametrical direction of the swivel shaft (3), and the stopper bolts (15) come into contact with the stopper bolts (15). A single plate-shaped stopper (14) that touches the table bracket
It is placed on the upper surface of (8). The stopper (14) is preferably located outside the working area, and the turntable (2) is arranged at a position exactly 180 ° pivoted. When the turntable (2) turns, one of the stopper bolts (15) arranged at diametrically opposite positions is engaged with the stopper (14).
The turntable positioning is achieved by hitting against and is clamped. Further, maintaining the positional accuracy of the turntable (2) in the turning direction and the rigidity against the cutting force on the second table surface (2a) are required for the indexing drive source (1
3) After the re-allocation operation is completed, the mechanical play of each part of the indexing mechanism is continued until the next indexing operation in the reverse direction is started.
It is held by giving a small rotational force so that (play) does not occur as backlash. As a method of giving a small turning force, for example, in the present embodiment, the surplus power is supplied to the motor to give the driving force to the turning shaft, but other methods may be used.

For vertical positioning and clamping of the turntable (2), a clamp plate (16) fixed to the table bracket (8) is attached to the turntable (2) side and a finely adjustable clamp roller (17) is provided. It is achieved by sandwiching with). As shown in FIGS. 4, 9, 10, 11, and 12, the clamp plate (16) is an arc-shaped plate member that follows the rotation locus of the turntable (2), and the table bracket (8) within the machining area. It is fixed by horizontally projecting from the side. Further, the clamp roller (17) is arranged on the lower surface of the table (2) at two positions which are opposed to each other in the diametrical direction of the turntable (2) and is vertically spaced so as to sandwich the clamp plate (16) from above and below. It is composed of a set of two rollers arranged with a space between them, and is further installed at two places at intervals in the longitudinal direction of the clamp plate (16). When the turntable (2) is swiveled to approach the indexing position, the clamp roller (17) starts gripping the clamp plate (16), and when the turntable (2) moves to the indexing position as shown in FIG.
As shown in 0, the clamp plate (16) is clamped at two places from above and below and at intervals in the arc direction to position the turntable in the up and down direction, and clamp the turntable at that position for processing. Prevent the vertical movement of the turntable (2). The clamp plate (16) is the stopper.
It is located in the machining area that is diametrically opposed to (14),
Maintains rigidity against cutting force on the table during processing. The position of the clamp roll (17) can be finely adjusted in the vertical direction.

According to the turntable of the present invention, a worm gear having a self-locking action is used for the indexing mechanism of the turntable (2), and the stopper (14) is provided at the indexing end.
Lock the stopper bolt (15) to the
By continuously applying a small driving force to (12), the turning direction for indexing and positioning of the turntable (2) and the clamping in the turning direction can be completed in one operation. Also, the vertical clamp is a table bracket
Attach the clamp plate (16) fixed to (8) to the turntable (2).
Since the clamp roller (17) attached to the is clamped by the indexing turning motion of the turntable (2), the indexing and positioning of the turntable (2) as well as the vertical clamping can be completed in one operation. . Thus, the indexing, positioning (turning direction and vertical direction), and clamp that are the main components of the turntable (2) reassignment operation
It became possible to achieve all of (the turning direction and the vertical direction) in one operation.

Further, a clamp roller for vertically clamping
Since the (17) is arranged in a pair up and down with respect to the clamp plate (16), there is a minus clearance with respect to the clamp plate (16).
It is also possible to apply (preload), turntable (2)
It is possible to improve the vertical rigidity of the. In addition, the clamp plate (16) and clamp roller (17) mounting position, number,
By changing the shape and the like, it is possible to easily change the rigidity of the turntable and the accuracy of the table surface.

[Brief description of drawings]

FIG. 1 is an overall perspective view

FIG. 2 is a perspective view of a main part

FIG. 3 is a view similar to FIG. 2 showing a turning state.

FIG. 4 is a plan view of a turntable.

FIG. 5 is a longitudinal sectional view of a main part.

FIG. 6 is a cross-sectional plan view of the same.

FIG. 7 is a perspective view showing a stopper and a stopper bolt.

FIG. 8 is a view similar to FIG. 7, but rotated in another direction.

FIG. 9 is a perspective view of a clamp plate and a clamp roller.

FIG. 10 is a view similar to FIG. 9 showing a state during clamping.

FIG. 11 is an exploded perspective view of a turntable.

FIG. 12 is an exploded perspective view of a stopper and a clamp plate.

[Explanation of symbols]

 (1) Vertical drilling tapping machine (2) Turntable (2a) First table surface (2b) Second table surface (3) Pivoting axis (4) Tool magazine (5) Tool (6) Workpiece (7) Base ( 8) Table bracket (9) Bearing tube (10) Worm wheel (11) Worm (12) Indexing drive shaft (13) Indexing drive source (14) Stopper (15) Stopper bolt (16) Clamp plate (17) Clamp roller

Claims (1)

[Claims] 1. A table surface for mounting and dismounting a workpiece located outside the machining area and a table surface for machining a workpiece located within the machining area, wherein a swivel axis is arranged at the center of both table surfaces. In a machine tool equipped with a turntable that reciprocates 180 °, a turning shaft and an indexing drive source are connected via a worm gear having a self-locking action, and a stopper that abuts each other at the indexing end. The stopper bolts are arranged on the table bracket and the turntable, the clamp plate is fixed to the table bracket side at the indexing end, and the clamp roller that clamps the clamp plate from above and below is attached to the turntable side. A characteristic machine tool turntable.