JPH07276096A - Crank type press device - Google Patents

Abstract

PURPOSE:To reduce the size of the mechanical press and incorporate the mechanical press compactly in a machining device even when the mechanical press is incorporated in the machining device equipped with plural press mechanisms. CONSTITUTION:A crank shaft 9 is driven and rotated by the driving source consisting of a motor 7 and a speed reducer 4, and a ram 13 which is connected to the crank arm 10 of the crank shaft 19 through a connecting rod 12 is moved forward and backward through the rotary driving of the crank shaft. The speed reducer 4 which whose input shaft and output shaft have a common axis or are parallel to each other is used, the output shaft of the motor 7 is arranged in parallel to and in the same direction with the input shaft 2 of the speed reducer 4, and the output shaft 3 of the speed reducer 4 is connected to the crank shaft 9 while both the shafts are aligned with each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressing apparatus suitable for trimming or bending a thin plate such as a semiconductor lead frame.

[0002]

2. Description of the Related Art A conventional hydraulic press is mainly used for punching and bending a semiconductor lead frame. The clean conditions of the above have become more and more severe, and due to this relationship, there are increasing attempts to use a mechanical press instead of the hydraulic press, which has a factor for obstructing the clean conditions such as oil smoke (for example, Japanese Patent Publication No.
No. 33439, JP-A-3-155496, and JP-A-3-155499).

However, the mechanical press also has some factors that hinder the expansion of its use, and one of them is the problem of increasing the size of the device. That is, the mechanical press has a significantly larger size of the press mechanism portion than the hydraulic press, and for example, a press mechanism corresponding to the number of steps such as a transfer processing device that performs transfer trimming and bending of thin plates. When it is necessary to provide a unit, the size of each press mechanism unit is added, and the entire apparatus becomes considerably larger than when a hydraulic press is used.

[0004]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to reduce the size of a mechanical press and also to make it compact when it is installed in a processing apparatus having a plurality of press mechanism parts. To do.

[0005]

In order to achieve the above objects, the present invention has a crankshaft rotatably driven by a drive source composed of a motor and a speed reducer, and is connected to a crank arm of the crankshaft via a connecting rod. Regarding a crank type press device configured to move a ram forward and backward according to the rotational drive of a crankshaft, a speed reducer in which an input shaft and an output shaft have a common axis core or are parallel to each other is used. The motor is arranged so that its output shaft is parallel to and in the same direction as the input shaft of the speed reducer, and the output shaft of the speed reducer is connected to the crank shaft with both shaft cores aligned.

This structure is characterized in that each shaft of the drive system, that is, the output shaft of the motor, the input / output shaft of the speed reducer, and the crank shaft are all arranged in parallel to each other. Thus, the size can be reduced to a significant level, that is, the size of the entire processing device can be reduced to a range comparable to the case where a hydraulic press is used when incorporated in a transfer processing device or the like.

Further, the parallel arrangement structure of the respective axes makes it possible to freely set the arrangement of the motor with respect to the speed reducer at any of the upper, lower, left and right positions. It is possible to give great flexibility to the connection with the mechanical part of. Also, this also makes it possible to significantly avoid an increase in the size of the transfer processing apparatus or the like as a whole.

Regarding the adjustment of the arrangement of such a motor,
The motor is attached to the connecting plate attached to the input shaft side of the reducer at its output shaft side, and the mounting direction of the connecting plate to the reducer is changed rotationally to freely arrange the motor relative to the reducer vertically and horizontally. It is preferable to be able to set to.

For directly connecting the output shaft of the speed reducer to the crank shaft in the same direction, a fitting hole is formed in the crank shaft or the output shaft of the speed reducer, and the mating shaft is fitted into the fitting hole. It is preferable to use a structure in which both shafts are connected to each other because the size can be further reduced as compared with the case of using a coupling or the like.

[0010]

EXAMPLE An example of the present invention will be described below. The present embodiment is an example of a press device which has a maximum pressing force of 3 tons for transfer processing of an IC lead frame.

Specifically, as shown in FIGS. 1 and 2,
The press machine 1 according to the present embodiment has a speed reducer 4 having a structure in which the input shaft 2 and the output shaft 3 have a common axis.
A connecting plate 5 is attached to the speed reducer 4 such that the input shaft 2 thereof projects to the front side. A servomotor 7 is attached to the connecting plate 5 in a state where the output shaft 6 thereof projects to the front side, and the output shaft 6 of the servomotor 7 is connected to the input shaft 2 of the speed reducer 4 by a timing belt 8. . That is, the output shaft 6 of the servo motor 7 is parallel to the input shaft 2 of the speed reducer 4 and oriented in the same direction.

The output shaft 3 of the speed reducer 4 has a bearing 9
The crankshaft 9 supported by b and 9b is connected with their axes aligned. Specifically, a connection hole 9j is formed in one end of the crankshaft 9, and the output shaft 3 of the speed reducer 4 is fitted into the connection hole 9j for keying. The crankshaft 9 has a disk-shaped crank arm 10, to which a connecting rod 12 is connected via a crankpin 11, and a ram 13 is attached to the base end of the connecting rod 12. Are connected by a ram pin 14.

The outer peripheral surface of the ram 13 is regulated by a bearing 17 provided in a guide hole 16 of a mounting plate 15 for incorporating the press device 1 into a transfer processing device or the like. While being regulated, it moves back and forth as indicated by arrow X in accordance with the rotation of the crankshaft 9 by the rotational driving force of the servomotor 7.

The forward / backward movement is such that the total stroke St is 80 m.
m, the effective stroke Se is 40 mm, and the actual pressing and bending such as punching and bending are performed within a range of 2-3 mm from the bottom dead center D of the effective stroke Se (FIG. 2).
During this pressure processing, the maximum speed is 50 mm / sec, and in other cases, 160 mm / sec is the maximum speed. These operation controls are based on the data obtained by the resolver 7r attached to the servo motor 7,
It is performed by a combination of speed control and torque control in the servo motor 7. The total stroke of 80 mm is a stroke for exchanging molds and the like, and the actual machining work is performed within the effective stroke range.

In the press machine 1 having the above-mentioned structure, by changing the mounting direction of the connecting plate 5 to the speed reducer 4, the positional relationship of the servo motor 7 with respect to the speed reducer 4 can be freely changed vertically and horizontally. . An example thereof is shown in FIG. The state of FIG. 3 is an example in which the servomotor 7 is arranged beside the speed reducer 4, and the reverse is naturally possible.

FIGS. 4 and 5 show examples of the fitting relations when a plurality of press devices 1 are juxtaposed by appropriately combining such arrangement variations of the servo motor 7. The example of FIG. 4 is an example in which two servomotors 7 are arranged side by side in order to save space in the vertical direction when there are two units side by side. On the other hand, the example of FIG. 5 is an example in which three or more units are arranged side by side, and the servo motor 7 is additionally mounted in order to save space in the lateral direction.

[0017]

As described above, in the press device according to the present invention, all axes of the drive system are arranged so as to be parallel to each other, and the arrangement relationship of the servo motor and the speed reducer can be freely set. Therefore, it is possible to reduce the size compared to the conventional mechanical press machine, and improve the assemblability when incorporating it into the host mechanism.For example, transfer processing equipment used for processing lead frames for semiconductors can be used for hydraulic presses. Instead, it makes it easier to adopt a mechanical press, which can contribute to dealing with the problem of obstructing clean conditions due to oil smoke and the like.

[Brief description of drawings]

FIG. 1 is a side view including a partial cross section of a pressing device according to an embodiment of the present invention.

FIG. 2 is a side view including a partial cross section as seen from the direction of arrow DA in FIG.

FIG. 3 is a side view of an example in which a servo motor is laterally attached to the press device of FIG.

FIG. 4 is a side view of an example in which two press devices of FIG. 1 in which servo motors are horizontally mounted are arranged side by side.

FIG. 5 is a side view of an example in which three or more pressing devices of FIG.

[Explanation of symbols]

 1 Pressing Device 2 Input Shaft 3 Output Shaft 4 Reduction Gear 5 Connecting Plate 6 Output Shaft 7 Servo Motor 9 Crank Shaft 9j Fitting Hole 10 Crank Arm 12 Connecting Rod 13 Ram

Claims (3)

[Claims] 1. A drive source composed of a motor and a speed reducer drives a crank shaft to rotate, and a ram connected to a crank arm of the crank shaft via a connecting rod moves back and forth in response to the rotary drive of the crank shaft. In the crank type press device, the input shaft and the output shaft have a common axis or are parallel to each other, and a motor is used for this speed reducer, and the output shaft is parallel to the input shaft of the speed reducer. A crank-type press device characterized in that the output shaft of the speed reducer is connected to the crank shaft with both shaft cores aligned and arranged so that they are oriented in the same direction. 2. The crank type press apparatus according to claim 1, wherein a fitting hole is formed in the crankshaft or the output shaft of the speed reducer, and the mating shaft is fitted in the fitting hole to connect both shafts. . 3. A motor is attached to a connecting plate attached to the input shaft side of the speed reducer at the output shaft side thereof, and the mounting direction of the connecting plate to the speed reducer is rotationally changed to thereby arrange the motor relative to the speed reducer. The crank type press device according to claim 1 or 2, wherein the crank type press device can be freely set up, down, left and right.