JP3132889U - Servo press machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use a power transmission mechanism operated by a general-purpose servo motor to output necessary power, to accurately control the position and speed of a slide, and to reduce the cost of the entire machine. A press device is provided.
Two sets of upper and lower ends are attached to the left and right sides of both sides of a slide 5 and an upper frame 6 corresponding to a pair of general-purpose servomotors SM1 and SM2 attached to both upper surfaces of the upper frame 6. A toggle mechanism TG1, TG2 having a symmetric structure is provided. The toggle mechanism TG1, TG2 is pivotally connected to the middle of the toggle mechanism TG1, TG2, is inserted and supported under the upper frame 6, and is rotated by the servo motors SM1, SM2. The screw member is slidably engaged with the ball screw 10 so as to move up and down, and both the toggle mechanisms TG1 and TG2 are expanded and contracted with respect to the upper frame 6 by the screw member that moves up and down by the rotation of the ball screw 10 to move the slide 5 up and down. It is configured as follows.
[Selection] Figure 2

Description

  The present invention relates to a servo press apparatus, and more particularly to an improvement of a servo press apparatus using a servo motor as a drive source.

  Conventionally, various press machines, small and medium, have been applied according to different application fields such as the size, shape and molding conditions of workpieces. Large press machines are especially popular in the field of deep drawing. in use. As a power transmission mechanism of a large press machine, for example, a link mechanism is generally known, and the slide is driven up and down by the power transmission mechanism.

  The main gear constituting the power transmission mechanism is connected to an electric main motor via a gear train, a clutch, and a flywheel, and the main gear is rotated by the electric main motor via the clutch and the gear train. It has become.

  In large press machines such as those described above, the slide forming speed at the time of machining can be changed and the slide stroke length (top dead center) in order to adapt the molding conditions during deep drawing to various workpieces. The length of the bottom dead center) is variable, and the point of correcting the slide inclination caused by the offset load is a problem.

  By the way, when the molding speed is changed, it is conventionally handled by changing the number of rotations of the electric main motor. In this case, however, one cycle time of the press operation is changed. If the speed is slowed down, the cycle time becomes longer and the productivity decreases, and the conventional configuration cannot cope with the point that the slide stroke length is variable. Furthermore, it is necessary to adjust on the mold side in terms of correcting the tilt of the slide.

  For these reasons, in recent years, in small and medium press machines, there has been proposed a servo press device in which a slide is directly driven by a servo motor through a predetermined power transmission mechanism and its motion is precisely controlled (for example, patents). Reference 1).

Japanese Patent Laid-Open No. 10-277799

  In the servo press device, a die is attached to the upper surface of a bolster that is horizontally disposed at the lower portion of the frame, and a servo motor and the rotational force of the servo motor are reciprocated to the slide at the upper portion of the frame. A power transmission mechanism that transmits the motion is mounted.

  The servo motor is provided with speed detecting means for detecting the rotational speed, such as a pulse generator, and the rotational speed of the servo motor is controlled by controlling the current by the servo control device. Is transmitted to the power transmission mechanism.

  However, in a power transmission mechanism that reciprocates the slide of a servo press in a small-to-medium-size press machine, when the weight increases, this is controlled at a high speed and a large output capable of large output to precisely control the position and speed of the slide. Servo motor is required.

  Therefore, at present, it is difficult to obtain a large servo motor that outputs a large power that can be used practically, so that it has a problem that the cost of the entire machine increases because it becomes a custom-made product.

  The present invention has been made paying attention to such problems, and by using a power transmission mechanism operated by a general-purpose servo motor, it is possible to output the necessary power and accurately control the position and speed of the slide. An object of the present invention is to provide a servo press device that can reduce the cost of the entire machine.

In order to solve the above-mentioned object, a servo press apparatus according to claim 1 of the present invention comprises a bolster 3 supported on a base 2 of a press machine 1 and having a lower mold M1 attached to the upper surface thereof, and the base 2 A slide 5 having an upper mold M2 attached to the lower surface thereof so as to face the lower mold M1 on the upper surface of the bolster 3 and inserted and supported by the four pedestals 4 standing and held on the upper surface of the bolster 3; An upper frame 6 attached to the upper end of the pedestal 4 and disposed opposite to the upper surface of the slide 5, a servo motor attached to the upper surface of the upper frame 6, and an intermediate between the slide 5 and the upper frame 6. In the servo press device comprising a power transmission mechanism mounted and moved up and down the slide 5 by the servo motor, the servo motor comprises a pair of general-purpose servo motors SM1 and SM2, and the power transmission mechanism comprises the slide 5 And upper frame 6 It has a symmetrical structure in which upper and lower ends are attached to both the left and right sides of the opposing surfaces and are spaced apart from each other, and corresponds to the pair of general-purpose servo motors SM1 and SM2 that are attached to both sides of the upper frame 6 to be separated from each other. The toggle mechanisms TG1 and TG2 are arranged so as to be connected to each other, and the toggle mechanisms TG1 and TG2 are arranged in the middle of the front-rear direction having a symmetrical structure and are pivotally connected to each other. Means 8 is provided so as to be movable up and down by the rotational driving force of the pair of servomotors SM1 and SM2, and the toggle operating means 8 is connected to the output shaft of the servomotors SM1 and SM2 so as to face downward. The ball screw 10 is inserted into and supported by the screw screw 10 and is moved up and down by the ball screw 10 that is rotationally driven by the activation of the servo motors SM1 and SM2. Servo characterized in that both of the toggle mechanisms TG1 and TG2 that are pivotably engaged with the child members are extended and retracted relative to the upper frame 6 so that the slide 5 moves up and down with respect to the bolster 3. It is a press device.
According to the servo press device described above, when the pair of general-purpose servo motors SM1 and SM2 are activated, the screw member 12 is moved up and down by the ball screw 10 that is rotationally driven, so that the screw member 12 can be pivoted. The combined toggle mechanisms TG1 and TG2 expand and contract with respect to the upper frame, and the slide 5 moves up and down with respect to the bolster 3. When the slide 5 moves downward, necessary power is given to the slide 5 by two sets of toggle mechanisms TG1 and TG2 driven by a pair of general-purpose servomotors SM1 and SM2.

  The present invention has the following effects.

  According to the first aspect of the present invention, the slide is moved up and down via a power transmission mechanism having a toggle mechanism driven by using a pair of general-purpose servomotors, so that an output of necessary power can be obtained. The position and speed of the slide can be accurately controlled, and the cost of the entire machine can be reduced.

  Embodiments of the present invention will be described below.

  1 to 5 show an embodiment of the present invention. FIG. 1 is a front view of a servo press apparatus according to the present invention, which is equipped with a power transmission mechanism for moving a slide up and down using a pair of general-purpose servo motors, and FIG. 2 is an X arrow of the servo press apparatus. FIG. 3 is a plan view of the servo press device, FIG. 4 shows a state in which the slide is raised by the power transmission mechanism, (a) is an enlarged front view of the power transmission mechanism, and (b) is an enlarged side view of the power transmission mechanism. FIGS. 5A and 5B show a state where the slide is lowered by the power transmission mechanism. FIG. 5A is an enlarged front view of the power transmission mechanism, and FIG. 5B is an enlarged side view of the power transmission mechanism.

  1 to 3, a servo press apparatus (hereinafter referred to as a press machine 1) has a bolster 3 for mounting a lower die M1 mounted on a base (bed) 2 of the press machine 1. On the bolster 3, a clamper for attaching a metal mold to a processing position is disposed although not particularly shown.

  Four pedestals 4 are erected and held on the base 2, and a slide 5 is inserted into and supported by the four pedestals 4 so as to face the bolster 3 so as to be vertically movable. An upper mold M2 is attached to the lower surface of the slide 5 so as to face the lower mold M1.

  Further, an upper frame 6 is attached to the upper ends of the four pedestals 4 inserted through the slide 5 so as to face the slide 5, and a pair of general-purpose servos are spaced apart diagonally on the upper surface of the upper frame 6. Motors SM1 and SM2 are attached.

  Between the slide 5 and the upper frame 6, a pair of power transmission mechanisms TG1 and TG2 for moving the slide 5 up and down by the general-purpose servomotors SM1 and SM2 are interposed.

  The power transmission mechanisms TG1 and TG2 are composed of two sets of toggle mechanisms, and are a pair of symmetrical structures with upper and lower ends attached to the left and right sides of both sides of the slide 5 and the upper frame 6 facing each other. It arrange | positions so that it may operate | cooperate so that it may correspond to a pair of general purpose servomotor SM1, SM2 on the said upper frame 6. FIG. A guide column G is inserted and held in the center of the upper frame 6, and the lower end of the guide column G is attached to the center upper surface of the slide 5, and serves as a guide when the slide 5 moves up and down. .

  As shown in FIG. 2, the toggle mechanisms TG1 and TG2 are arranged in the middle in the front-rear direction having a symmetrical structure and are connected to each other so as to be pivotable. The toggle mechanism 8 is rotated by the pair of servo motors SM1 and SM2. It can be moved up and down by a driving force.

  The toggle actuating means 8 is screwed into a ball screw 10 connected to the output shafts of the servo motors SM1 and SM2 and vertically inserted and supported by the upper frame 6 so as to face the lower side of the upper frame 6. Both of the toggle mechanisms TG1 and TG2 that are pivotally engaged with the screw member 12 that moves up and down by the ball screw 10 that is rotationally driven by the activation of the motors SM1 and SM2 are expanded and contracted with respect to the upper frame 6, and the slide 6 is moved. The bolster 3 is configured to move up and down.

  Specifically, the screw member 12 includes a driven pulley having a ball screw 10 rotatably supported by a holder H attached to the upper frame 6 and an output of the driven pulley and the servomotors SM1 and SM2 attached to the upper end thereof. It is configured to be movable up and down by rotating in the forward and reverse directions via a belt stretched between drive pulleys attached to the respective shafts.

  The toggle mechanisms TG1 and TG2 include an upper holder 14 attached to the lower surface of the upper frame 6 and the slide 6 as shown in FIGS. 4 (a), 4 (b) and FIGS. 5 (a), 5 (b). A lower holder 15 attached to the upper surface of the upper holder 14, a first link member L1 having one end pivotally supported on the support shaft 16 of the upper holder 14 and the other end pivotally attached to the pivot 18, and both sides of the screw member 12 A second link member L2 having one end supported by the support shaft 22 and the other end pivotally attached to the pivot 18 of the first link member L1, and a pair of one formed on the support shaft 20 of the lower holder 15 on one end side. The arm R is pivotally supported so as to be pivotable, and the other end is composed of a third link member L3 pivotally attached to the pivot 18.

  When the press machine 1 configured as described above is in an initial state, the pair of general-purpose servomotors SM1 and SM2 is in a state where the slide 6 is held at the rising end as shown in FIGS. 4 (a) and 4 (b). Is in a stopped state.

  In this state, the screw member 12 is held at the rising end, the toggle mechanisms TG1 and TG2 engaged with the screw member 12 are reduced with respect to the upper frame 6, and the slide 6 is positioned at the rising end. Accordingly, the upper mold M2 is positioned at the rising end together with the slide 6.

  Next, when press working is started by the press machine 1, as shown in FIGS. 5 (a) and 5 (b), the pair of general-purpose servo motors SM 1 and SM 2 are activated so that both ball screws 10 are simultaneously moved in one direction. The screw member 12 is driven to rotate and moves downward.

  By this downward movement, the support shaft 22 supporting one end of the second link member L2 is lowered, and the first link member L1 is moved along the support shaft 16 of the upper holder 14 while moving the pivot 18 on the other end side downward. As a center, it swings on both outer sides of the press machine 1.

  As a result, the third link member L3 that has been inclined inward until now is positioned at the rising end by swinging and standing on both outer sides of the press machine 1 around the support shaft 20 of the lower holder 15. The slide 5 that has been moved is guided by the four pedestals 4 to move downward, and the workpiece is pressed by the upper mold M2 on the lower surface of the slide 5 and the lower mold M1 on the bolster 3. At the time of this press working, necessary power is given to the slide 5 by the two sets of toggle mechanisms TG1 and TG2.

  In this manner, the slide 6 is configured to move up and down by a power transmission mechanism including the toggle mechanisms TG1 and TG2 using a pair of general-purpose servomotors SM1 and SM2 without using a large servomotor as in the prior art. Thus, the necessary power can be output, the position and speed of the slide 6 can be accurately controlled, and the cost of the entire press machine can be reduced.

1 is a front view of a servo press apparatus according to the present invention, which includes a power transmission mechanism that moves a slide up and down using a pair of general-purpose servo motors. FIG. 2 is a view in the direction of arrow X in FIG. 1 according to the present invention. It is a top view of the servo press apparatus which concerns on this invention. The state where the slide rose by the power transmission mechanism is shown (a) is an enlarged front view of the power transmission mechanism, and (b) is an enlarged side view of the power transmission mechanism. The state which the slide fell by the power transmission mechanism is shown, (a) is an enlarged front view of the power transmission mechanism, (b) is an enlarged side view of the power transmission mechanism.

Explanation of symbols

1 Press machine (servo press machine)
2 beds (base)
3 Bolster 4 Leg pillar 5 Slide 6 Upper frame 8 Toggle actuating means 10 Ball screw 12 Screw member 14 Upper holder 15 Lower holder 16 Support shaft 18 Axis 20 Support shaft 22 Support shaft H Holder L1 First link member L2 Second link member L3 First 3-link member M1 Lower mold M2 Upper mold R-arm SM1, SM2 General-purpose servo motor TG1, TG2 Toggle mechanism (power transmission mechanism)

Claims (1)

The bolster 3 supported on the base 2 of the press machine 1 and having the lower mold M1 attached to the upper surface thereof, and the four pedestals 4 erected and held on the base 2 are inserted and supported so as to be movable up and down. A slide 5 having an upper die M2 attached to the lower surface so as to face the lower die M1 on the upper surface of the bolster 3, and an upper frame attached to the upper ends of the four pedestals 4 and opposed to the upper surface of the slide 5 And a power transmission mechanism that is interposed between the slide 5 and the upper frame 6 and moves the slide 5 up and down by the servo motor. In
The servo motor is composed of a pair of general-purpose servo motors SM1 and SM2, and the power transmission mechanism has a symmetrical structure in which upper and lower ends are attached to the left and right sides of both sides of the slide 5 and the upper frame 6 which are opposed to each other. And provided with two sets of toggle mechanisms TG1 and TG2 arranged to correspond to the pair of general-purpose servomotors SM1 and SM2 mounted on both sides of the upper surface of the upper frame 6 so as to be separated from each other,
The toggle mechanisms TG1 and TG2 can be moved up and down by the rotational driving force of the pair of servo motors SM1 and SM2 in the middle of the symmetric structure in the front-rear direction and pivotally connected to each other. The toggle actuating means 8 is coupled to the output shafts of the servo motors SM1 and SM2 and screwed into a ball screw 10 inserted and supported by the upper frame 6 so as to face downward, and the servo motors SM1 and SM2 Both the toggle mechanisms TG1 and TG2 that are pivotally engaged with the screw members that are moved up and down by the ball screw 10 that is rotationally driven by the activation of the slide are extended and retracted with respect to the upper frame 6 so that the slide 5 is moved with respect to the bolster 3. The servo press device is configured to move up and down.

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