JPH059798U - Press machine with C-shaped frame structure - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the frame from swaying in the up / down and front / rear directions due to the vertical movement of the slide. [Structure] In a press machine having a frame (1) side surface having a C-shaped structure, a balance weight (21) mounted so as to be capable of reciprocating in the vertical direction and the balance weight (2).
1) has a driving mechanism (30) that reciprocates the slide (5) in the opposite direction to the vertical reciprocating motion, and the inertia force of the slide (5) during press operation is the center of gravity (G) of the frame (1). A press machine having a C-shaped frame structure provided with a dynamic balance device (20, 30) configured to generate an opposite moment (M2) that cancels a moment (M1) applied to the.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a press machine having a C-shaped frame structure.

[0002]

[Prior Art]

 FIG. 4 shows a schematic configuration of a C-shaped frame structure press machine. In the figure, reference numeral 1 is a C-shaped frame structure, and the side shape is similar to the alphabet C, as the name implies. 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 having the upper die mounted thereon 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, when the distance between the center of gravity G of the frame 1 and the slide 5 is L1, the moment M1 (= F1 × L1) is generated at the center of gravity G of the frame. Thus, conventionally, a press machine having a C-shaped frame structure has been used within a range in which the vertical and front-back sway of the crown 1C due to the moment M1 does not affect the desired product accuracy.

[0005]

[Problems to be solved by the device]

 However, in today's demand for even higher precision, the shaking caused by the moment M1 cannot be ignored. Therefore, the rigidity of the C-shaped frame structure is uniquely increased, but there is a limit to increasing the rigidity. This is because it violates the demand for low cost, light weight, and miniaturization.

An object of the present invention is to prevent the frame from moving vertically and backward and forward 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 a structure press machine.

[0007]

[Means for Solving the Problems]

 According to the present invention, in a press machine having a C-shaped frame side surface, a balance weight mounted so as to be able to reciprocate upward and downward, and the balance weight is reciprocated in a direction opposite to the vertical reciprocation of the slide. A dynamic balance device having a drive mechanism and configured to generate an opposite moment that cancels a moment given to the center of gravity of the frame by the inertial force of the slide during press operation.

[0008]

[Action]

 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 opposite direction 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 center of gravity of the frame. 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]

【Example】

 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 a crown is omitted and a part is sectioned, and FIG. Note that FIG. 1 is a vertical cross-sectional view taken along the line AA of FIG.

The C-frame press machine is provided with a dynamic balance device including a balance unit 20 including a balance weight 21 and a drive mechanism 30, and the center of gravity of the frame 1 due to the inertial force of the slide 5 is provided. It is configured so that the moment to G can be canceled.

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

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 M 1 given to the center of gravity G of the frame 1 by the inertial force F1 of the slide 5 is (F1 × L1) when the distance between the slide 5 and the center of gravity G is L1 shown in FIG. If this moment M1 is left as it is, the frame 1 will sway up and down and back and forth, and the relative position between the upper die and the lower die will change.

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. In detail, in FIG. 2, the balance weight 21 is provided with a hole 21H penetrating vertically, 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. The balance weight 21 is provided with a space 21S shown in FIGS. 1 and 2, and a pin 24 is attached to an upper slit 23S.

On the other hand, as shown in FIG. 1, the drive mechanism 30 for moving the balance weight 21 up and down in the direction opposite to the up and down movement of the slide 5 includes a drive pin 31 eccentrically fixed to the crankshaft 2 and a drive pin 31. It comprises a link 33 that connects the 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 such a configuration, the balance weight 21 can be accommodated in the space 21S.

The axis Z1 of the crank portion 2a and the axis Z2 of the drive pin 31 are vertically opposite to the axis Z of the crankshaft 2 as shown in FIG. Moves up and down in the direction opposite to the slide 5. The vertical stroke of the balance weight 21 can be made smaller than the vertical stroke of the slide 5 by setting the eccentricity e1> e2.

Further, 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 due to the vertical movement of the balance weight 21 is (F2 × L2). . The moment M 2 (= 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.

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

In this embodiment having such a configuration, 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 × L1) given to the center of gravity G of the frame 1 by the slide 5 and the moment M2 (= F2 × L2) generated by the balance weight 21 are almost equal in absolute value and opposite to each other. Therefore, it is possible to prevent the frame 1 (in particular, the front surface of the crown 1C that holds the slide 5) from swinging up and down and swinging back and forth.

Therefore, according to this embodiment, the dynamic balance device including the balance unit 20 including the balance weight 21 and the drive mechanism 30 is provided, and the dynamic balance device is used for the vertical movement of the slide 5 during the press operation. Since the moment M1 (= F1 × L1) with respect to the center of gravity G due to the movement is canceled, the moment M2 (= F2 × L2) in the opposite direction can be generated. (1C) can be prevented from swaying up and down, front and back, ensuring high precision press working. Moreover, since it is not necessary to make the rigidity of the frame 1 itself excessively strong, 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 includes a drive pin 31 fixed to the crankshaft 2 and a link 33, and is configured to move the balance weight 21 up and down by using the rotational force of the crankshaft 2. , The balance weight 21 and the slide 5 can be completely synchronized with each other and can be vertically moved in the opposite directions.

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

Further, since the dynamic balance device (20, 30) is arranged on the front surface of the crown 1C and is covered with the cover 1F, work safety can be ensured. Moreover, the height of the dynamic balance device can be made low, which does not interfere with the pressing 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]

[Effect of the device]

 As described above, according to the present invention, in the press machine having the C-shaped side surface of the frame, the balance weight mounted so as to reciprocate in the vertical direction and the balance weight are opposed to the vertical reciprocal movement of the slide. And a drive mechanism that reciprocates in the same direction, and a dynamic balance device that is 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. Therefore, by making the frame rigidity excessively strong, the high cost, large size and heavy weight of the conventional defects can be eliminated, and the vertical and front / back swing of the frame can be prevented, further improving the press working accuracy.

[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)

[Claims for utility model registration] 1. In a press machine having a C-shaped frame side surface, a balance weight mounted so as to be capable of reciprocating in the vertical direction and a reciprocating movement of the balance weight in the vertical direction of a slide. A dynamic balance device having a drive mechanism for reciprocating in the opposite direction 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. A press machine with a characteristic C-shaped frame structure.