JPH0750079Y2 - Press machine with C-shaped frame structure - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press machine having a C-shaped frame structure.

[0002]

2. Description of the Related Art FIG. 4 shows a schematic structure of a C-shaped frame structure press machine. In the figure, reference numeral 1 denotes a C-shaped frame structure whose side shape is similar to the alphabet C as its name indicates. A crankshaft 2 is rotated by a main gear (not shown), and a slide 5 is connected to a crank portion 2a of the crankshaft 2 via a connecting rod 3. In addition, 6 is a bolster for mounting the lower mold.

Therefore, when the crankshaft 2 is rotated, the slide 5 to which the upper die is attached moves up and down, and press working can be performed in cooperation with the lower die.

By the way, in the C-shaped frame structure, as shown in FIG. 4, when the slide 5 moves downward, a downward inertial force F1 is generated. As a result, if the distance between the center of gravity G of the frame 1 and the slide 5 is L1, then the frame center of gravity G is
A moment M1 (= F1 × L1) is generated. Thus,
Conventionally, a press machine having a C-shaped frame structure has been used within a range in which the vertical and longitudinal swings of the crown 1C due to the moment M1 do not affect the desired product accuracy.

[0005]

However, nowadays, there is a strong demand for higher precision, and the shaking due to the moment M1 cannot be ignored. Therefore, uniquely C
Although the rigidity of the shaped frame structure is strengthened, there is a limit to strengthening this rigidity. This is because it violates the requirements for low cost, light weight, and miniaturization.

An object of the present invention is to provide a C-shaped frame structure capable of canceling the vertical and forward / backward swing of the frame by canceling the moment to the center of gravity of the frame due to the vertical movement of the slide without excessively increasing the rigidity of the frame. To provide the press machine.

According to the present invention, in a press machine having a C-shaped frame side surface and a crankshaft provided in the front-rear direction, a balance weight mounted so as to be reciprocable in the vertical direction and the balance weight are slid. And a drive mechanism for reciprocating in a direction opposite to the vertical reciprocating movement of the crankshaft.
A part supported by a bearing that uses the Ebb part as a bearing part
The drive pin is fixed to the
The balance weight is connected to the frame
To guide up and down freely with a guide rod,
Set the eccentric position of the drive pin to 180 with respect to the eccentricity of the crank part.
° Link weights with phase shift
By being configured to be installed in the space provided in
The present invention is characterized in that a dynamic balance device configured to generate an opposite moment for canceling a moment given to the center of gravity of the frame by the inertial force of the slide during press operation is provided.

[0008]

In the present invention having the above structure, when the slide moves up and down, the drive mechanism moves the balance weight up and down in the direction opposite to the slide. Here, the dynamic balance device including the balance weight and the drive mechanism is configured to generate an opposite moment that cancels the moment given by the inertial force of the slide to the frame center of gravity. Therefore, it is possible to prevent the frame from swaying up and down and front and back, so that it is possible to perform high precision machining without excessively increasing the frame rigidity.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of a main part, FIG. 2 is a front view in which a part of the crown is omitted and a part is sectioned, and FIG. 3 is a schematic side view for explaining the operation. Note that FIG. 1 is a vertical cross-sectional view taken along the line AA of FIG.

Here, in the press machine having the C-shaped frame structure, the balance unit 2 including the balance weight 21 is provided.
0 and a drive mechanism 30 are provided, and the moment of inertia of the slide 5 with respect to the center of gravity G of the frame 1 can be canceled.

In FIG. 1, a crankshaft 2 having a crank portion 2a is rotatably mounted in a crown 1C of a frame 1 via bearings 7,7. 12 is a main gear (gear 12G), which is an intermediate gear 11 (gear 11G).
The drive shaft 10 (pinion 10G) is rotated in a predetermined direction via G). A pin 13 having a slider 14 is attached to the main gear 12. This pin 13 (1
4) is a bracket 15 fixed to the crankshaft 2.
It is mounted in the groove 15C.

Therefore, when the drive shaft 10 is rotated by a motor (not shown), the crankshaft 2 is rotated, and the slide 5 can be moved up and down via the connecting rod 3. At this time, the moment M1 that the inertial force F1 of the slide 5 gives to the center of gravity G of the frame 1 is (F1) if the distance between the slide 5 and the center of gravity G is L1 shown in FIG.
X L1). If this moment M1 is left as it is, the frame 1 is shaken up and down and back and forth, and the relative position between the upper die and the lower die is changed.

The balance unit 20 includes a balance weight 21, guide rods 25, 25, etc., and is provided on the front side of the crown 1C. Specifically, in FIG. 2, the balance weight 21 is provided with a hole 21H penetrating up and down, and bushes 26, 26 slidable on the guide rod 25 are attached above and below the hole 21H. Therefore, the balance weight 21 can move up and down freely. In addition, the balance weight 21 is shown in FIG.
The space 21S shown in FIG. 2 is provided and the upper slit 23
A pin 24 is attached to S.

On the other hand, a drive mechanism 30 for moving the balance weight 21 up and down in a direction opposite to the up and down movement of the slide 5.
As shown in FIG. 1, is composed of a drive pin 31 eccentrically fixed to the crankshaft 2 and a link 33 connecting the drive pin 31 and the balance weight 21. That is, the lower end of the link 33 is rotatably supported by the drive pin 31 via the bush 34, and the upper end is rotatably supported by the pin 24 via the bush 35. With this configuration, the balance weight 21 can be accommodated in the space 21S.

Since the axis Z1 of the crank portion 2a and the axis Z2 of the drive pin 31 are upside down with respect to the axis Z of the crankshaft 2 as shown in FIG. , Moves up and down in the direction opposite to slide 5. It is also possible to make the vertical stroke of the balance weight 21 smaller than the vertical stroke of the slide 5 by setting the eccentricity amount e1> e2.

The weight of the balance weight 21 is determined so that the following inertial force (F2) can be generated. In FIG. 3, when the distance between the balance weight 21 and the center of gravity G is L2 and the inertial force of the balance weight 21 is F, the moment M2 with respect to the center of gravity G based on the vertical movement of the balance weight 21 is (F2 × L2). The moment M2 (= F2 × L2) is substantially equal to and opposite to the moment M1 (= F1 × L1) based on the vertical movement of the slide 5.

Further, as shown in FIG. 1, the dynamic balance device (20, 30) is provided on the front surface of the crown 1C and is covered with a cover 1F to ensure work safety.

Reference numeral 40 is a crank angle meter, and a pointer 41
And a scale 42. The pointer 41 is attached to the drive pin 31 via the shaft 43 and the bar 44, and its axis is equal to the axis Z of the crankshaft 2.

In this embodiment having such a structure, when the slide 5 is moved up and down by the crankshaft 2 to perform press working, the drive mechanism 30 moves the balance weight 21 up and down in the direction opposite to the slide 5. Here, the moment M1 (= F1 ×) that the slide 5 gives to the center of gravity G of the frame 1
L1) and the moment M2 (= F2 × L2) generated by the balance weight 21 are substantially equal in absolute value and opposite to each other, and therefore, the frame 1 (especially, the front portion of the crown 1C that holds the slide 5). It is possible to prevent swaying up and down and back and forth.

According to this embodiment, however, the balance unit 20 including the balance weight 21 and the drive mechanism 3 are provided.
And a moment M with respect to the center of gravity G based on the vertical movement of the slide 5 during the press operation of the dynamic balance device.
Since a moment M2 (= F2 × L2) in the opposite direction capable of canceling 1 (= F1 × L1) is generated, the frame 1 (1
C) can be prevented from swinging up and down and in the front-back direction, and high precision press working can be guaranteed. Moreover, since it is not necessary to increase the rigidity of the frame 1 itself excessively, it can be realized at a low cost.

Further, since the dynamic balance device, particularly the balance weight 21 is disposed on the front side of the crown 1C, the press machine does not need to be taller than in the case where it is provided on the same line as the slide 5.

The drive mechanism 30 comprises a drive pin 31 fixed to the crankshaft 2 and a link 33,
Since the balance weight 21 is moved up and down by utilizing the rotational force of the crankshaft 2, the balance weight 21 and the slide 5 can be moved up and down in the opposite direction in perfect synchronization.

Further, the drive mechanism 30 (31, 33)
Is compact because it is stored in the space 21S of the balance weight 21. On the other hand, since the weight of the balance weight 21 itself can be adjusted by using this space 21S to attach and detach the auxiliary weight, the applicability is wide.

Further, a dynamic balance device (2
(0, 30) is provided on the front surface of the crown 1C and covered with the cover 1F, so that work safety can be ensured. Moreover, the height of the dynamic balance device can be made low, which does not interfere with the press work.

Although the balance weight 21 is provided on the front surface of the crown 1C in the above embodiment, the balance weight 21 may be provided closer to the center of gravity G with respect to the slide 5. Further, the structures of the balance weight 21, the drive mechanism 30, and the like are not limited to the above disclosed examples.

[0026]

As described above, according to the present invention, in a press machine having a C-shaped frame side surface, a balance weight mounted so as to reciprocate in the vertical direction and the balance weight in the vertical direction of the slide. A dynamic balance device having a driving mechanism that reciprocates in the opposite direction to the reciprocating motion and configured to generate an opposite moment that cancels the moment given to the center of gravity of the frame by the inertial force of the slide during press operation is provided. Because it is a configuration,
By excessively strengthening the frame rigidity, the conventional drawbacks that were high in cost, large in size, and heavy in weight can be eliminated, the vertical and front / back swing of the frame can be prevented, and the press working accuracy can be further improved.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a main part of an embodiment of the present invention.

FIG. 2 is likewise a front view in which a part of the crown is omitted and a part is sectioned.

FIG. 3 is likewise a schematic side view for explaining the operation.

FIG. 4 is a schematic side view showing a conventional example.

[Explanation of symbols]

 1 frame 1C crown 1F cover 1S space 2 crankshaft 2a crank part 3 connecting rod 5 slide 6 bolster 10 drive shaft 11 intermediate gear 12 main gear 20 balance unit 21 balance weight (dynamic balance device) 21S space 24 pin 30 drive mechanism (dynamic balance) Device) 31 Drive pin 33 Link 40 Crank angle meter 41 Pointer 42 Scale

Claims (1)

[Scope of utility model registration request] 1. The side surface of the frame has a C-shaped structure ,
On the other hand, in a press machine in which a crankshaft is provided in the front-rear direction, a balance weight (21) mounted so as to be capable of reciprocating in the vertical direction, and the balance weight (21) in a direction opposite to the reciprocating movement of the slide (5) in the vertical direction. And a drive mechanism for reciprocating the drive mechanism, wherein the drive mechanism is a crankshaft.
Bearing with the front web portion of the shaft (2) as the bearing portion
Drive pin (31) on the part supported by (7)
Is fixed, and the drive pin (31) and the balance weight (2
1) and the balance weight are connected via a link (33).
Guide rod (21) to frame (1)
(25) guides it up and down freely, and drives pin (3
The eccentric position of 1) is 1 with respect to the eccentricity of the crank part (2a).
The link (33) is separated by shifting the phase by 80 degrees.
Structure inside the space provided in the weight (21)
By doing, slides during press operation
A press machine having a C-shaped frame structure, which is provided with a dynamic balance device configured to generate an opposite moment for canceling a moment given to the center of gravity of the frame (1 ) by the inertial force of (5) .