JPS6320130A - Metallic die rotating device for press machine - Google Patents

Abstract

PURPOSE:To improve the positioning accuracy of a press machine by providing a hollow shaft servomotor on a rotary on a rotary base, and also, installing a metallic die which can slide in the axial direction, on its hollow shaft. CONSTITUTION:A suitable number of servomotors 31 are provided on the upper turret 3, a stator 33 provided with a magnetic pole and a winding is fixed to the upper turret 3, and also, a rotor 35 consisting of a permanent magnet is fixed to a hollow shaft 37. A metallic die punch 7 is inserted and fitted into the hollow shaft 37, so that is can move upward and downward freely in the axial direction through a key groove 39 and a slide key 41, and also, it can rotate together with the hollow shaft 37. According to this mechanism, between the hollow shaft 37 of the servo motor 31 and the punch 7, a play scarcely exists. Accordingly, in this way, the positioning accuracy of the punch 7 is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION a. Field of Industrial Application This invention relates to a press machine, and more particularly to a rotating device for a mold wedged on a rotating base.

b. Conventional press machines For example, when punching a hole of the same shape with a turret punch press in a different direction, or when changing the direction in a nibbling operation,
By appropriately rotating the lower mold, it is possible to continue working with the same mold without replacing the mold. For this purpose, a device for accurately rotating the mold is required, and conventionally, for example, there is a turret punch press shown in FIG. 2 in which a mold rotating device as shown in FIG. 3 is wedged.

FIG. 2 is a front view of the turret pan-de-press 1, in which a plurality of sets of punches 7 and dies 9 are wedged to an upper turret 3 and a lower turret 5, each serving as a rotating base. A workpiece plate W is held between these punches and the die by a clamping device 11.
The punch moves back and forth and left and right, and is processed by a striker 13 provided above the punch.

FIG. 3 is a plan view showing a rotating device for a die (punch) provided in the upper turret 3. FIG. As shown in the figure, among the plurality of punches provided on the same circumference of the upper turret 3,
The two punches 7a and 7b are rotary punches, and are rotatably provided with respect to the upper turret 3 by worm gears 15a and 15b, respectively. Both worm gears 15a,
One end of the worm shaft 15b is connected by a connecting shaft 17, and the other end is provided to slightly protrude from the outer periphery of the turret 3. This protrusion is appropriately connected to a connecting device 19 provided on the frame side of the pande press, and the timing belt 21. Pulley 23° transmission shaft 25. The gear device 27 and the like are driven by a drive device 29.

In this way, many drive parts are interposed between the rotary molds 7a, 7b and the drive device 29, and gaps exist between each part. Therefore, it is difficult to accurately position the mold at a predetermined rotational position. For this reason, some rotary molds are equipped with a mold position detector near the rotary mold to correct the position.

C1 Problems to be Solved by the Invention As mentioned above, the conventional mold rotating device has a complicated mechanism with many driving parts interposed between it and the driving device, and also has a complicated mechanism due to the play between each part. It was difficult to position the mold, and it was necessary to make corrections using a complicated correction device. This invention was devised by paying attention to these points, and by making the rotating shaft of the servo motor hollow, inserting a mold inside the hollow shaft, and directly rotating the mold, it is extremely effective. The object of the present invention is to provide a simple mold rotating device that has no play in the transmission part and allows accurate positioning.

Means for Solving the d1 Problem In order to achieve the above object, the present invention provides a suitable number of hollow shaft servo motors on the rotary base of a press machine, and connects the hollow shafts of these motors to the rotary base. A mold is inserted into this hollow shaft, and the mold is mounted horizontally on the hollow shaft so that it can freely slide in the axial direction with a sliding key and be restrained in the rotational direction. It is composed of

OPERATION Owing to this construction, the mold rotates with the hollow shaft by means of the sliding key with almost no play.

Therefore, accurate positioning is possible. Further, since the mold can freely move in the axial direction of the hollow shaft along the sliding key, punching can be performed without any trouble.

f. Example Next, an example of the present invention will be described based on the drawings. FIG. 1 shows an embodiment of the mold rotating device of the present invention, which is wedged on an upper turret 3.

The servo motor 31 of the embodiment is a step motor, the stator 33 is fixed to the upper turret 3 and has magnetic poles and windings, and the rotor is made of a permanent magnet 35 and is fixed to a hollow shaft 37.

The punch 7 is inserted into the hollow shaft 37, and a sliding key 41 fixed to the hollow shaft 37 is fitted into a key groove 39 provided on the side surface, so that the punch 7 slides vertically and rotates together with the hollow shaft. do. A restoring spring 15 is installed between the pandev and the spring holder 13.

With this configuration, there is almost no play between the hollow shaft of the servo motor and the punch, and therefore highly accurate positioning is possible. In this example, a step motor is used as the 4-novo motor, but a DC or AC servo motor may be used with a feedback mechanism added.

0. Effects of the Invention As understood from the above description, the present invention has the structure set forth in the claims, so it has an extremely simple structure, has no play in the transmission part, and can be positioned accurately. A mold rotation device for a turret punch press can be provided.

[Brief explanation of drawings]

FIG. 1 is a detailed explanatory diagram of the present invention, FIG. 2 is a front view of a turret pan-depress embodying the present invention, and FIG. 3 is an explanatory diagram of a conventional mold rotating device. Explanation of symbols representing main parts in drawings 1...Turret punch press

Claims (1)

[Claims] An appropriate number of hollow shaft servo motors are installed on the rotating base, the hollow shafts of the servo motors are provided to be rotatable relative to the rotating base, and a mold is inserted into this hollow shaft and wedged in the axial direction. A mold rotation device for a press machine, which is characterized by: