JPH0761558B2 - Press machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a press machine capable of producing a thin product with high accuracy.

"Prior Art" Conventionally, a press machine shown in FIG. 2 is known as a press machine for manufacturing thin products such as IC chip lead frames and floppy disks.

In FIG. 2, reference numeral 1 is a bolster to which the lower mold 2 is attached. A slide table 4 on the lower surface of which the upper mold 3 is attached is arranged above the bolster 1, and a rod connecting plate 5 is arranged below the bolster 1. Holes 6 and 6 are formed in the bolster 1, and guide rods 7 and 7 are inserted into the holes 6 and 6 so as to penetrate the bolster 1 and extend in the vertical direction. The upper ends of the guide rods 7, 7 are fixed to the slide table 4, and the lower ends thereof are fixed to the plate 5. The guide rods 7, 7 are supported by the roller guide bushes 8, 8 so that they can move only in the vertical direction.

On the other hand, below the plate 5, a flywheel 9 which is rotationally driven by a drive source (not shown) is arranged. An upper end of a connecting rod 11 is rotatably attached to the plate 5 via a pin 10, and the flywheel 9 is connected to the flywheel 9 via a pin 12 at a position separated from the central axis thereof by a certain dimension.
The lower end of the is rotatably attached.

This press machine connects the rotary motion of the flywheel 9 to the connecting rod.
Convert to linear motion by 11 and move the plate 5 up and down,
This motion is transmitted to the slide table 4 via the guide rods 7 and 7, whereby the upper mold 3 is moved up and down with respect to the lower mold 2.

"Problems to be Solved by the Invention" Problems to be solved by the present invention are the following problems that occur in the above press machine. That is, in the above press machine, the rotary motion of the flywheel 9 is converted into a linear motion by the connecting rod 11 to move the slide table 4 up and down. In this configuration, since the lower end portion of the connecting rod 11 is rotated, the horizontal component force acting on the connecting rod 11 is applied to the plate 5 and the guide rods 7, 7.
Is transmitted to the slide table 4 via the, and finally a horizontal force is applied to the upper mold 3. The horizontal component force applied to the upper die 3 is extremely small when the press machine is operated at a low speed, but becomes a large force when the press machine is operated at a high speed, which greatly affects the manufacturing accuracy of the product. come. Therefore, the above-mentioned press machine has a problem that the dynamic accuracy is deteriorated during high-speed operation.

"Means for Solving Problems" Among the inventions, the first invention is to arrange a slide table having an upper mold attached to a lower surface above a bolster having a lower mold attached to an upper surface, and to arrange the bolster and the slide. An oscillating arm is supported above or below the table so that one end thereof can move vertically with the other end as a fulcrum, and the oscillating arm is provided between the end portions of the oscillating arm. A drive mechanism is provided which is provided with a slider movable in any direction, the slider and the slide table or a member connected to the slide table are connected by a connecting rod, and the swing arm is moved vertically with the other end as a fulcrum. Is provided.

The second invention is, in addition to the constituent features of the first invention, provided with a die height adjusting mechanism for varying the vertical position of a member supporting the other end of the swing arm. .

"Embodiment" FIG. 1 is a diagram showing an embodiment of the present invention. In this figure, the same elements as those shown in FIG. 2 are designated by the same reference numerals. It should be noted that the description of the same component parts as those shown in FIG. 2 is omitted.

The press machine shown in FIG. 1 mainly differs from the press machine shown in FIG. 2 in the structure of the drive unit of the slide table 4.

That is, in this press machine, the swing arm 20 is arranged below the plate 5 so as to extend in a substantially horizontal direction. The swing arm 20 is supported so that one end 21 side of the swing arm 20 can move up and down with the other end 22 as a fulcrum. This swing arm 20 has a large diameter hole 23 at one end 21 thereof.
And a guide recess 24 extending in the direction between the end portions 21 and 22 is formed at the center in the length direction. An eccentric ring 25 is arranged in the hole 23 at a constant distance from the wall surface of the swing arm 20, and a large number of bearings 26, 26, ... Are provided between the wall surface and the outer peripheral surface of the eccentric ring 25. It is inserted so that it cannot be pulled out to the outside. The eccentric wheel 25 is fixed to a main shaft 27 that is rotatably driven by a drive source (not shown) at a position eccentric from the center axis thereof. With this structure, the swing arm 20 moves in the vertical direction and the horizontal direction when the eccentric shaft 25 rotates together with the main shaft 27. Thus, the eccentric wheel 25, the main shaft 27, and the drive source constitute a drive mechanism 28 that moves the swing arm 20 in the above direction.

In addition, the swing arm 20 is provided in the guide recess 24 of the swing arm 20.
A slider 29 is disposed at a fixed distance from the upper and lower wall surfaces of the slider 29, and a large number of bearings 30, 30 ... It is installed in a closed state. Based on this configuration, the slider 29 moves the swing arm 20 in the guide recess 24.
It is movable in the direction between the ends 21 and 22 of the. The plate 5 and the slider 28 are connected by a connecting rod 31. That is, pins 32 and 33 are fixed to the plate 5 and the slider 28, respectively, and upper and lower ends of the connecting rod 31 are rotatably attached to the pins 32 and 33.
In this case, the connecting rod 31 is connected to the connecting rod guide bush 34.
Due to this, lateral movement is restricted, and only vertical movement is possible.

On the other hand, the frame 36 arranged on one side of the plate 5
An adjusting bolt 37 is attached to the shaft so as to be rotatable and immovable in the directions of arrows A and B. An L-shaped adjusting arm 38 is screwed to the thread portion of the adjusting bolt 37 so as to be unrotatable and movable in the directions of arrows A and B. An upper end of a connecting rod 39 is rotatably connected to a lower end of the adjusting arm 38 via a pin 40, and a lower end of the connecting rod 39 is a swing arm 20.
Is rotatably connected to the other end of the pin via a pin 41.
When the adjusting bolt 37 is rotated under this structure, the adjusting arm 38 moves in the directions of arrows A and B, and the upper end portion of the connecting rod 39 moves in the same direction, whereby the swing arm 20. The other end of moves vertically. This swing arm 20
Each member that moves the other end of the up and down is a die height adjustment mechanism.
Comprises 41.

Next, the operation of the press machine configured as described above will be described.

In order to operate this press machine, the lower mold 2 and the upper mold 3 are attached to the bolster 1 and the slide table 4, respectively, and the die height is adjusted (this adjustment will be described later), and then a drive source (not shown) is attached. The main shaft 27 and the eccentric wheel 25 are rotated by operating them. When the eccentric wheel 25 rotates, the swing arm
One end 21 side of 20 swings vertically with pin 41 as a fulcrum. At this time, the swing arm 20 swings horizontally also while swinging the connecting arm 39 with the pin 40 as a fulcrum. When the swing arm 20 swings vertically and horizontally in this way, the slider 29 arranged in the guide recess 24 of the swing arm 20 moves up and down, thereby connecting rods connected to the slider 29. 31 moves up and down. At this time, the connecting rod 31 moves only in the vertical direction by being guided by the connecting rod guide bush 34. At this time, the slider
Since the swing arm 20 swings in the horizontal direction, 29 is an end portion of the swing arm 20 in the guide recess 24.
Relative movement between 21,22 direction. When the connecting rod 31 moves up and down, the plate 5, the guide rods 7 and 7, and the slide table 4 move up and down in conjunction with the rod 31, so that the upper die 3 moves up and down with respect to the lower die 2.

As described above, in this press machine, when the eccentric wheel 25 is rotated to swing the swing arm 20 in the vertical direction and the horizontal direction, the slider 29 causes the end portions 21, 2 of the swing arm 20 to move.
2 Since it moves relatively in the direction between the
Almost no horizontal component force is applied to. Therefore, in this press machine, almost no horizontal component force is applied to the guide rods 7, 7, the slide table 4, and the upper die 3, so that the upper die 3 is set with respect to the lower die 2 even at high speed operation. The product can be manufactured with high precision because the product can be accurately rolled down to the specified position. Also, in this press machine, since no horizontal force is applied to the vertically moving guide rods 7,7, these rods 7,7 move smoothly inside the bushes 8,8 ,. It is possible to prevent scratches.

Further, in this press machine, bearings 26, 26, ..., 30, 30 ... Are provided between the eccentric wheel 25 and the swing arm 20, and between the slider 29 and the swing arm 20, respectively. Therefore, the heat generated in these parts can be received in a very small amount. Further, since the connecting rod 31 hardly rotates with respect to the pin 32, almost no heat is generated in these connecting portions.
In addition, since the rotation range of the connecting rod 31 with respect to the pin 33 is small, the heat generated in these connecting portions is extremely small. Here, it is important that a small amount of heat is generated between the connecting rod 31 and the pins 32 and 33 and in the vicinity thereof.
That is, such a small amount of heat can prevent thermal expansion of the connecting rod 31, and keep the positional relationship between the molds 2 and 3 (precision of the bottom dead center of the upper mold 3) accurate. You can
In addition, the small amount of heat generated between the connecting rod 31 and the pins 32 and 33 allows the gap between these connecting portions to be set to a small value, which can prevent rattling between each member and improve accuracy. It is possible to improve.

To adjust the die height in the above press machine, the bolt 37 is operated. That is, when the bolt 37 is rotated, the arm 38 moves in the directions of arrows A and B to move the pin 40.
Move in the same direction, whereby the connecting rod 39 changes the vertical position of the end 22 of the swing arm 20. When the position of the end portion 22 of the swing arm 20 changes, the vertical position on the slide table 4 side changes via the connecting rod 31, whereby the die height adjustment is performed.

The present invention is not limited to the one in which the drive unit of the slide table is below the bolster as in the above-described embodiment.
It can also be applied to a press machine in which the drive unit is arranged above the bolster and the slide table.

[Advantages of the Invention] According to the present invention, a swing arm is provided above or below the bolster and the slide table, the swing arm being supported so that one end thereof can move in the vertical direction with the other end as a fulcrum. The swing arm is provided with a slider that is movable in the direction between the ends of the swing arm, and the slider and the slide table or a member connected to the slide table are connected by a connecting rod. If the slider is vertically swung with the other end as a fulcrum, the slider moves relative to the both ends of the swing arm to move the connecting rod only in the vertical direction. No horizontal force is applied to the upper mold attached to the. Therefore, even when high-speed operation is performed, the upper die moves downward only in a predetermined state, and the dynamic accuracy can be improved. Therefore, the press machine according to the present invention is suitable as a press machine for producing products requiring high accuracy, for example, thin products such as IC chip lead frames and floppy disks.

[Brief description of drawings]

FIG. 1 is a side view of a part of a press machine shown as an embodiment of the present invention in cross section, and FIG. 2 is a side view of a part of a conventional press machine in cross section. 1 ... Bolster, 2 ... Lower mold, 3 ... Upper mold, 4 ...
Slide table, 20 …… Swing arm, 21,22 …… End of swing arm, 28 …… Drive mechanism, 29 …… Slider, 31…
… Connecting rod, 41… Die height adjustment mechanism.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Victory Kanda 3 No. 1 Kogane-cho, Niigata City, Niigata Mitsubishi Metal Co., Ltd. Niigata Works (72) Inventor Masanobu Tanaka 1 No. 3 Kogane-cho, Niigata City, Niigata Mitsubishi Metal Co., Ltd. Niigata Manufacturing Company

Claims (2)

[Claims] 1. A bolster having a lower mold attached to an upper surface thereof, a slide table movably supported above the bolster and having a lower upper mold attached thereto, and a bolster disposed above or below the bolster and the slide table. A swing arm whose one end side is supported so as to be movable in the vertical direction with the other end as a fulcrum, and a slider which is swingably supported by the swing arm in the direction between the ends of the swing arm. A connecting rod having one end rotatably attached to the slider and the other end rotatably attached to the slide table or a member connected to the slide table, and the swing arm. A press machine comprising: a drive machine that moves up and down with an end as a fulcrum. 2. A bolster having a lower die attached to an upper surface thereof, a slide table movably supported above the bolster and having an upper die attached to a lower surface thereof, and above or below the bolster and the slide table. A swing arm that is disposed so that one end thereof can move vertically with the other end as a fulcrum, and a swing arm that is movably supported by the swing arm in the direction between the ends of the swing arm. A slider, one end rotatably attached to the slider, the other end rotatably attached to the slide table or a member connected to the slide table, and the swing arm. And a drive mechanism for vertically moving the other end of the swing arm as a fulcrum, and a die height adjustment for varying the vertical position of a member supporting the other end of the swing arm. Press machine, characterized by comprising; and a mechanism.