JP2502266Y2 - Press stroke changing device of press machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a press stroke changing device of a press machine.

(Prior Art) When performing a forming process, a slotting process, or the like in a press machine, it may be necessary to change the punching amount of the punch with respect to the die. In this case, the punch heights are different from each other. It is necessary to prepare a plurality of molds in advance or to use a press machine whose press stroke can be changed.

Conventionally, as a press machine whose press stroke can be changed, there are a hydraulic machine using a servo valve and a press machine having a plurality of strikers having different lengths and selectively using a striker having a predetermined length. Are known.

(Problems to be solved by the invention) When a plurality of dies having different punch heights are used, the press stroke may be constant, but there is a problem that many dedicated dies must be prepared.

A hydraulic press machine with variable press stroke using a servo valve can adjust the press stroke steplessly and properly, but in this case, it is necessary to provide a dedicated hydraulic circuit and the hydraulic unit is It will be a big one.

In a press machine of the type that selects and uses multiple strikers with different striker lengths, the hydraulic unit does not become large, but in reality there is a limit to the number of strikers that can be installed. This is often
The number is two or three. Therefore, various press strokes cannot be obtained, and there is a problem that versatility is lacking.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a press stroke changing device of a press machine which has a simple structure and can change and set the press stroke steplessly and reliably.

[Structure of the Invention] (Means for Solving the Problem) In order to solve the above-mentioned conventional problems, in the present invention, a striker support member for supporting a striker movably in a stroke direction on a ram in a press machine is provided. Provided rotatably, a disk-shaped height adjusting inclined plate that changes the amount of movement of the striker in the stroke direction is configured so that a part of the periphery of this height adjusting inclined plate is located between the ram and the striker. The height adjusting inclined plate includes a flat surface on the ram side and an inclined surface on the striker side so that the plate thickness in the stroke direction continuously changes in the circumferential direction. A servomotor for rotating the striker is provided, and an urging member for urging the striker toward the inclined surface is provided.

(Operation) In the above configuration, the stroke direction of the portion located between the ram and the striker in the peripheral portion of the height adjusting tilt plate is rotated by rotating the height adjusting tilt plate by a predetermined rotation angle by driving the servo motor. Change the plate thickness of. As a result, the amount of movement of the striker in the stroke direction can be changed steplessly in combination with the biasing force of the biasing member, and the press stroke can be changed steplessly.

Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 2 shows a turret punch press as an example of a suitable press machine in which the press stroke changing device according to the present invention is used. The turret punch press is provided with a lower frame 1, left and right columns 3 and 5 which are erected on both sides of the lower frame 1, and an upper portion which is provided between the left and right columns 3 and 5, respectively. And a frame 7.

On the lower frame 1, a work table 9, a work clamp device 11, and a lower turret 15 on which a plurality of dies 13 are attached.
Etc. are provided. The upper frame 7 is provided with an upper turret 19, to which a plurality of punches 17 are attached, a ram 21, a striker 23, a ram drive shaft (crank shaft) 25, and the like.

A press stroke changing device 27 according to the present invention is provided between the ram 21 and the striker 23.

FIG. 2 shows a concrete embodiment of the press stroke changing device 27. Press stroke changing device 27 is a bolt
It is fixedly attached to the lower end of the ram 21 by the 29
It has a striker support member 31 for movably supporting 23 in the press stroke direction, that is, in the vertical direction in the drawing. The striker support member 31 has a cylinder chamber 35 that receives the striker large-diameter portion 33 provided at the base of the striker 23 so as to be slidable in the vertical direction in the figure, and the cylinder chamber 35 holds the striker 23. ing.

An inclined plate support member 39 is integrally attached to one side of the striker support member 31 with a bolt 37. The inclined plate support member 39 is supported by a bearing 41 so that the inclined plate support shaft 43 serves as a vertical axis.
Is rotatably supported. Key 45 for tilt plate support shaft 43
The height adjusting slant plate 47 is fixedly mounted by the key, and the driven gear 49 is fixedly mounted by the key 45. A servo motor 51 is attached to the inclined plate support member 39, and a drive gear 55 that meshes with the driven gear 49 is attached to the output shaft 53 of the servo motor 51.

The height adjusting inclined plate 47 has a disk shape and has a horizontal upper surface 47a and an inclined lower surface 47b. The horizontal upper surface 47a is slidably joined to the ceiling surface 35a of the cylinder chamber 35, and the inclined lower surface 47b is connected to the inclined lower surface 47b. Is slidably joined to the upper end flat surface 57a of the swing connection member 57.

The swing connection member 57 has a hemispherical portion 57b at the lower end portion, and is engaged with the hemispherical concave portion 23a provided at the upper end portion of the striker 23 in the hemispherical portion 57b in a spherical articulated manner.

A compression coil spring 59 is provided between the large diameter portion 33 of the striker 23 and the lower end of the striker support member 31, and the compression coil spring 59 moves the striker 23 into the striker support member 31.
In contrast, it is biased upward in the figure. A compression coil spring 61 having a spring force smaller than that of the compression coil spring 59 is provided between the striker 23 and the swing connection member 57, and the compression coil spring 61 connects the hemispherical portion 57b of the swing connection member 57. The striker 23 is biased in the pressing direction toward the hemispherical recess 23a.

According to the above-described configuration, the driving gear 55 is rotationally driven by the servo motor 51, so that the height adjusting inclined plate 47 is rotationally displaced about the inclined plate support shaft 43 by a predetermined rotational angle with the driven gear 49. Like Due to the rotational displacement of the height adjusting inclined plate 47, this causes the ceiling surface 47a of the striker support member 31 and the upper end flat surface 5 of the swing connection member 57.
The portion (plate thickness in the stroke direction) located between 7a and 7a changes, and the movement amount of the striker 23 in the stroke direction changes steplessly due to the change in vertical thickness in this portion. As a result, the amount of protrusion of the striker 23 from the striker support member 31 changes, and the effective striker length of the striker 23 changes. The change in the effective stroke length of the striker 23 causes the press stroke to change.

In the above, the present invention has been described in detail with respect to a specific embodiment, but the present invention is not limited to this, and various embodiments are possible within the scope of the present invention. It will be apparent to those skilled in the art.

[Effects of the Invention] As can be understood from the above description of the embodiment, in the press stroke changing device of the press machine according to the present invention, the striker is driven by rotating the height adjusting inclined plate by driving the servo motor. The press stroke can be changed steplessly by changing the amount of movement in the stroke direction steplessly. Therefore, it is possible to perform all the slotting and molding processes with a single mold without using a large hydraulic unit, and it is possible to easily adjust the height change due to the polishing of the mold on the striker side. become. Furthermore, by driving the servo adjusting motor to rotate the height adjustment tilt plate by a specified rotation angle, subtle height adjustments such as molding (adjustment of the striker's stroke direction with respect to the ram) can be reliably performed. Will be possible.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a press stroke changing device according to the present invention, and FIG. 2 is a front view showing an embodiment of a turret type punch press having a press stroke changing device according to the present invention. . 21 …… ram, 23 …… striker 27 …… press stroke change device 47 …… height adjustment tilt plate 51 …… servo motor, 57 …… swing connection member

Claims (1)

(57) [Scope of utility model registration request] 1. A striker support member for movably supporting a striker in a stroke direction is provided on a ram of a press machine, and a disk-shaped height adjusting inclined plate for changing the stroke-direction movement amount of the striker is rotatably provided. The height adjusting inclined plate is configured such that a part of its peripheral portion is located between the ram and the striker, and the height adjusting inclined plate has a flat surface on the ram side and is continuously stepless in the circumferential direction on the striker side. A slope motor is provided so as to change the plate thickness in the stroke direction, a servo motor for rotating the height adjusting tilt plate is provided, and a biasing member for biasing the striker toward the tilt surface is provided. A press stroke changing device for a press machine.