JP3722888B2 - Punching press - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a punching press .
[0002]
[Prior art]
Conventionally, for example, as a driving device for moving a conveyed object which is a heavy metal block provided in a punching press, a ball screw which is a power transmission shaft is rotated by a single driving motor, and the above-mentioned via a nut member. A mechanism for moving the mold block is common.
[0003]
[Problems to be solved by the invention]
By the way, in the drive system for moving the above-described conventional conveyed product, a large torque is required to move the heavy conveyed item, and the motor capacity is increased. For this reason, the inertia ratio was increased, taking up space and increasing the weight and cost. In the case of a large torque, there is a problem that the extension and twist of the power transmission shaft increase.
[0004]
SUMMARY OF THE INVENTION An object of the present invention is to provide a driving method and an apparatus for driving a power transmission shaft that reduce the elongation and torsion of the power transmission shaft, improve the dangerous speed, reduce noise and vibration, and reduce the cost. There is.
[0005]
[Means for Solving the Problems]
In view of the above , the present invention provides a C-shaped coupling between a punch holder provided on the upper frame of the frame so as to be movable in the Y-axis direction and a die holder provided on the lower base of the frame so as to be movable in the Y-axis direction. An actuator that is integrally provided with a member and that hits a plurality of punches provided in the punch holder is provided in the punch holder so as to be movable in the X-axis and Y-axis directions, and the punch holder and the die holder are moved in the Y-axis direction. Both sides of the ball screw for movement are rotatably supported on the columns on both sides of the frame via bearings, and the ball screw is pre-tensioned in consideration of the elongation of the ball screw due to heat generation during operation. And both ends of the ball screw are respectively connected to a Y-axis motor .
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below in detail with reference to the drawings. Although the punching press is targeted as a machine incorporating the drive unit of the power transmission shaft, which is the main part of this embodiment, it is not limited to this model, but is intended for all drive systems of general machine tools. It is what.
[0010]
With reference to FIGS. 3, 4, and 5, first, the overall arrangement of the punching press and the incidental equipment will be schematically described for easy understanding.
[0011]
Referring to FIG. 5, the uniaxial moving punching press 1 includes a gate-shaped frame 3, which extends in the X-axis direction (vertical direction in FIG. 5) of the frame 3 and a plurality of LM guide rails 5. Is laid on the base 7.
[0012]
On the LM guide rail 5, a carriage 11 is movable in the X-axis direction via an LM guide 9 (see FIGS. 3 and 4). The carriage 11 is integrally provided on the left and right sides by a stay 13. ing. Each carriage 11 is provided with a plurality of work clamps 15. The work clamp 15 is moved by a Y-axis drive motor 17 to a ball screw 19 (see FIG. 3) and a nut member (not shown) in the Y-axis direction (FIG. 5). In the horizontal direction).
[0013]
The carriage 11 is movable in the X-axis direction from a X-axis drive motor 21 (see FIG. 4) via a ball screw 23 and a nut member (not shown). The workpiece can be positioned at a desired position. Reference numeral 25 denotes a table.
[0014]
Next, the uniaxial moving punching press 1 will be described in more detail.
[0015]
3 and 4 together, a column 29 is erected on the left and right sides of the lower base 27 in the frame 3 constituting the punching press 1, and an upper frame 31 is integrally formed on the upper portion of the column 29. It is provided and configured.
[0016]
In the frame 3, a punch holder 35 having a plurality of punches 33 and a die holder 39 having a plurality of dies 37 opposite to the punch 33 are integrally formed by a C-shaped connecting member 41. Is provided. The lower surface of the die holder 39 extends on the lower base 27 via the LM guide 43 in the Y-axis direction (the left-right direction in FIG. 3 and the direction orthogonal to the drawing in FIG. 4). The upper surface of the punch holder 35 is engaged with an LM guide rail 49 provided on the lower surface of the upper frame 31 via the LM guide 47, and is provided so as to be movable in the axial direction.
[0017]
The punch holder 35 is screwed into a ball screw 51, which is a power transmission shaft extending in the Y-axis direction, via a nut member (not shown), and both ends (left and right sides in FIG. 3) of the ball screw 51 are connected to Y. The shaft drive motors 53A and 53B are connected, and the Y-axis drive motors 53A and 53B are fixed to the frame 3.
[0018]
With the above configuration, when the Y-axis drive motors 53A and 53B are driven, the ball screw 51 as the power transmission shaft rotates, and the punch holder 35 is moved along the LM guide rail 49 by the LM guide 47 via the nut member in the Y-axis direction. Will be moved to. Since the punch holder 35 and the die holder 39 are provided integrally, the holder 39 is also moved in the Y-axis direction along the LM guide rail 45 by the LM guide 43.
[0019]
A plurality of dies 37 are provided in the die holder 39, and a punch holder 35 having a plurality of punches 33 is provided above the die 37 so as to face the die 37. Inside the punch holder 35, a ram cylinder 55, which is an actuator for hitting the punch 33, is provided on the ram carrier 57 so as to be movable in the X-axis direction (direction orthogonal to the screen in FIG. 3, left and right direction in FIG. 4). The ram carrier 57 is provided on the LM guide rail 49 so as to be movable in the Y-axis direction via the LM guide 59.
[0020]
As a driving member for moving the ram carrier 57 in the Y-axis direction, a ram carrier 57 is provided via a nut member (not shown) on a ball screw 61 provided in the punch holder 35 so as to extend in the Y-axis direction. ing. A Y-axis drive motor 63 is connected to the end of the ball screw 61 (on the right side in FIG. 3), and the Y-axis drive motor 63 is fixed to one side of the punch holder 35.
[0021]
Further, as a driving member for driving the ram cylinder 55 in the X-axis direction, a ram cylinder 55 is provided via a nut member (not shown) on a ball screw 65 provided in the ram carrier 57 so as to extend in the X-axis direction. Is provided. An X-axis drive motor 67 is connected to the terminal (right side in FIG. 4) of the ball screw 65, and the X-axis drive motor 67 is fixed to one side of the ram carrier 57.
[0022]
With the above configuration, when the Y-axis drive motor 63 is driven, the ball screw 61 rotates, and the ram carrier 57 is moved in the Y-axis direction via the nut member screwed into the ball screw 61. Further, when the X-axis drive motor 67 is driven, the ball screw 65 rotates, and the ram cylinder 55 is moved in the X-axis direction via a nut member screwed into the ball screw 65.
[0023]
That is, the ram cylinder 55 can move in the X and Y axis directions, and the ram cylinder 55 can be positioned directly above the desired punch 33 among the plurality of punches 33 arranged on the punch holder 35. The punch 33 is hit, and the workpiece is punched in cooperation with the die 37.
[0024]
Next, the drive system of the ball screw 51 which is a power transmission shaft, which is a main part as an example of the embodiment of the present invention, will be described in detail.
[0025]
Referring to FIG. 1, a punch holder 35, which is a conveyed product, is placed on an LM guide rail 45 that extends on the lower base 27 and extends in the Y-axis direction (left-right direction in FIG. 1) via the LM guide rail 43. And a die holder 39 are integrally provided by a connecting member 41 so as to be movable in the Y-axis direction. A ball screw 51, which is a power transmission shaft extending in the Y-axis direction for moving the moving body, is screwed through a nut member 69 provided in the punch holder 35.
[0026]
Both sides of the ball screw 51 are supported by bearings 71 provided on the column 29, and both ends of the ball screw 51 are connected to Y-axis motors 53A and 53B fixed to the column 29 via couplings 73, respectively. The Y-axis drive motors 53A and 53B are, for example, servo motors, the Y-support shaft drive motor 53A is for positioning control, and the Y-axis drive motor 53B is for power assistance without an encoder.
[0027]
The bearing 71 will be described in more detail. Referring to FIG. 2, the bearing portion 71 has a plurality of bearings 77 (for example, angular bearings) mounted in a bearing body 75, and the neck portion 51 </ b> A of the ball screw 51 is fitted into the bearing 77. An end plate 79 is provided on the bearing body 75, and the end plate 79 presses and fixes the outer ring of the bearing 77. Further, the inner ring of the bearing 77 is pressed and fixed by, for example, a double nut which is a tension member 83 through a spacer 81, and the double nut which is the tension member 83 is screwed into a screw portion 51 </ b> B carved in the ball screw 51. Yes.
[0028]
As a function of the above configuration, the bearing 71 of the ball screw 51 is pre-tensioned in advance in consideration of the elongation of the ball screw 51 due to heat generation during operation. For this reason, the double nut which is the tension member 83 is rotated to apply pretension to the ball screw 51.
[0029]
In this state, the servo motors which are Y-axis drive motors 53A and 53B are synchronously driven, the ball screw 51 is rotated, and the punch holder 35 which is a moving body is attached to the Y-axis via a nut member 69 screwed into the ball screw 51. Move and position in the direction.
[0030]
Thus, since the pretension is preliminarily applied to the ball screw 51, the tension becomes close to zero due to the elongation of the ball screw 51 due to heat generation during operation, and in the case of a large torque, the ball screw 51 is less stretched and twisted. Also, the critical speed of the ball screw 51 is improved. In addition, since the drive motors 53A and 53B are provided at both ends of the ball screw 51 to transmit the rotation, other methods, that is, timing belts, gears, and the like are not used. it can.
[0031]
The present invention is not limited to the above-described embodiments of the invention, and can be implemented in other modes by making appropriate changes. For example, in the example of the present embodiment, the pre-tension of the ball screw 51 is applied, but one method of using the ball screw 51 as a spline and absorbing the elongation of the ball screw 51 may be used. It is also possible to absorb the elongation.
[0032]
【The invention's effect】
As can be understood from the above description of the example of the embodiment, according to the present invention , a pre-tension is preliminarily applied to the ball screw for moving the punch holder and the die holder , and a drive motor is connected to both ends. To drive the ball screw .
[0033]
Thus, the elongation and twist of the ball screw are reduced, and the critical speed is improved. Furthermore, since no other rotation transmission member is required, noise and vibration can be reduced and cost can be reduced.
[Brief description of the drawings]
FIG. 1 is an explanatory front view of a drive system showing a main part of the present invention and including a power transmission shaft and a drive motor.
FIG. 2 is an enlarged cross-sectional view taken along a line II in FIG.
FIG. 3 is a front explanatory view showing a punching press according to the present invention.
4 is an enlarged side view illustrating the side viewed from the right side in FIG. 3;
5 is an explanatory plan view of FIG. 3. FIG.
[Explanation of symbols]
1 Punching press 3 Frame 15 Work clamp 33 Punch 35 Punch holder 37 Die 39 Die holder 51 Ball screw (power transmission shaft)
53A, 53B Y-axis drive motor (drive motor)
55 Ram cylinder 57 Ram carrier 71 Bearing portion 83 Tension member

Claims (1)

A punch holder (35) provided on the upper frame (31) in the frame (3) so as to be movable in the Y-axis direction, and a die holder (movable in the Y-axis direction on the lower base (27) in the frame (3)). 39) is integrally provided by a C-shaped connecting member (41), and an actuator for striking a plurality of punches (33) provided in the punch holder (35) is placed in the punch holder (35). Both sides of a ball screw (51) for moving the punch holder (35) and the die holder (39) in the Y-axis direction are provided on both sides of the frame (3) ( 29) is rotatably supported via a bearing portion (71), and a pretension is applied to the ball screw (51) in consideration of the elongation of the ball screw (51) due to heat generation during operation. Punching press, characterized in that the end portions of the ball screw (51) is configured to coupled to the Y-axis motor (53A, 53B) respectively while.

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