Press machine

Abstract

The present invention provides a low-cost press machine in which the amount of swing of a slider during high SPM operation is small. A press machine (1) is provided with: a hydraulic cylinder (30) fordriving a slider (20); a plurality of hydraulic pumps / motors (P / M1 to P / M5) each having a first port connected to a first pressurizing chamber (30A) of the hydraulic cylinder (30); a plurality of servo motors (SM1 to SM5) each connected to a rotating shaft of each hydraulic pump / motor (P / M1 to P / M5); and a slider position controller (100) for controlling the servo motor such that the position ofthe slider is set to a position corresponding to the slider position command signal on the basis of the slider position command signal from the slider position command unit and the slider position signal from the slider position detector (70), the high-pressure accumulator (60) being connected.

Description

technical field [0001] The present invention relates to a press machine, in particular to a high-speed press machine in which the number of strokes per minute (SPM: Shots Per Minute) of a slider is 100 or more. Background technique [0002] When producing IC (Integrated Circuit) lead frames, precision terminals, and other relatively thin precision mass-produced parts with a relatively high SPM of about 100 to 500 SPM, conventionally, mechanical press machines specially suited for high speeds have been used in many cases. . [0003] This type of press machine is composed of a large number of dynamic balance maintaining mechanisms that suppress the swing of the press machine caused by the unbalanced inertial force of the crankshaft and the like under high-speed rotation, and is maintained by the rotation angle between the same bearings as the crankshaft. A special mechanism for maintaining high SPM, such as a special bearing mechanism with a very small gap without unevenness....

AI Technical Summary

Problems solved by technology

[0012] In Patent Document 1, it is described that a hydraulic cylinder is controlled by a hydraulic pump driven by a servo motor, but it is not described to control the position of the slider at a high SPM

In addition, in the hydraulic drive device described in Patent Document 1, there is only one hydraulic pump driven by the servo motor, and it is unrealistic to use one hydraulic pump to operate the hydraulic cylinder at a high SPM.

[0013] In the high-speed stamping machine described in Patent Document 2, the rod of the small-diameter auxiliary cylinder is connected to the piston of the pressure cylinder. When the pressure cylinder is unloaded, the piston advances and retreats at high speed through the auxiliary cylinder. In the case of a small-diameter auxiliary cylinder driven by a pump, it is impossible to make the piston advance and retreat at high speed

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