JP2008188631A - Pressure molding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure molding apparatus capable of suppressing increase in a manufacturing cost even when high speed motion is required for shortening a cycle time or when a large output is required according to upsizing of a work. <P>SOLUTION: A driving mechanism comprises: a ball screw shaft drooping from a movable member, a first nut threaded onto the upper end portion of the ball screw shaft, a first rotation-transmitting mechanism for transmitting rotation to the first nut, a first driving motor rotationally driving the first nut through the first rotation-transmitting mechanism, a second nut threaded onto the part of the ball screw shaft that is located lower than the first nut, a second rotation-transmitting mechanism for transmitting rotation to the second nut, and a second driving motor rotationally driving the second nut through the second rotation-transmitting mechanism. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pressure molding apparatus. More specifically, the present invention relates to a pressure molding apparatus that pressurizes or heats a work (molded body) such as a resin, a resin sheet, or a substrate and molds the workpiece into a predetermined shape.

  Conventionally, for example, after a work (molded body) is placed between a fixed surface plate to which a lower die is attached and a movable surface plate to which an upper die is attached, the lower die and the upper die are kept at a predetermined temperature. There is a pressure molding apparatus that molds a work by lowering the movable surface plate and pressurizing the work with a predetermined pressing force while heating at (see Patent Document 1).

Japanese Patent Laid-Open No. 10-277796

In the pressure molding apparatus described in Patent Document 1, the drive unit that drives the movable surface plate up and down includes four ball screw mechanisms disposed on the top plate of the apparatus main body and one ball screw mechanism for driving each ball screw mechanism. And a servo motor. For example, if high-speed movement is required to shorten the cycle time or if a large output is required as the workpiece becomes larger, it is necessary to change to a servo motor with a large output capacity. Moreover, since the marketability is low, the cost is high and the delivery time is very long.
In addition, since the motor with a large output capacity is very large, the motor and the ball screw mechanism cannot be stored in the lower part of the main body of the apparatus, and are placed in the upper part of the main body. As a result, the height of the apparatus becomes higher and the installation location is limited.
In addition, when compared with a hydraulic cylinder with the same output, the diameter of the ball screw needs to be several times larger than the ram diameter of the hydraulic cylinder, which is a factor that costs the ball screw several times more than the hydraulic cylinder. It has become one. This is because the ball screw is not inferior in strength to the ram diameter of the hydraulic cylinder of the same diameter but because the strength of the ball screw nut is insufficient, it is necessary to use a large ball screw nut.
Furthermore, as with a motor with a large output capacity, the ball screw also has a large cost and a long delivery time when the screw size is large. Together with a motor with a large output capacity, the cost of manufacturing the device is high and the delivery time is long. The problem of becoming is inevitable.

  Therefore, in view of the above circumstances, the present invention suppresses an increase in manufacturing cost even when high-speed movement is required to shorten the cycle time or when a large output is required in accordance with an increase in the size of a workpiece. An object of the present invention is to provide a pressure molding apparatus capable of performing

  The pressure molding apparatus according to the present invention includes a main body having a base at a lower portion, a fixing member fixed to upper end portions of four guide rods erected on the base, and the base and the fixing member. A movable member that is inserted into the guide rod so as to be movable up and down; a drive mechanism that raises and lowers the movable member inside the base; and a drive control unit that controls the movement of the movable member by the drive mechanism. A pressure molding apparatus including a control panel, wherein the drive mechanism includes a ball screw shaft suspended from the movable member, a first nut screwed into an upper end portion of the ball screw shaft, and the first nut A first rotation transmission mechanism that transmits rotation to the first rotation motor; a first drive motor that rotationally drives the first nut via the first rotation transmission mechanism; and a ball screw shaft that is below the first nut. The second nut and the rotation of the second nut A second rotation transmitting mechanism is reached, it is characterized by comprising a second drive motor for rotationally driving the second nut via a second rotation transmission mechanism.

According to the present invention, the drive mechanism for raising and lowering the movable member is disposed inside the base, and one ball screw shaft coupled to the movable member as the drive mechanism is screwed into the vertical position. Since the first nut and the second nut are driven by the drive motor via the respective rotation transmission mechanisms, a plurality of motors can be arranged without using a motor having a large output capacity. By using a plurality of motors with a small output capacity that are easily available without using a motor with a large output capacity for a long delivery time, it is possible to achieve a low cost and a short delivery time.
In addition, by installing a plurality of ball screw nuts and distributing the load, the diameter of the ball screw can be reduced, so that the cost can be reduced and the delivery time can be reduced.
At this time, if a single motor with a large output capacity is arranged for multiple ball screw nuts, and the force is branched and transmitted by gears, etc., due to processing tolerances and assembly errors, some ball screw nuts The load may be concentrated and the ball screw nut may be destroyed.
For this reason, each ball screw nut and the motor are arranged one-on-one, and it is possible to control the torque of each motor and to distribute the load applied to the nut.

  The pressure molding apparatus of the present invention will be described below with reference to the accompanying drawings. A pressure molding apparatus according to an embodiment of the present invention includes a main body A, a fixed member B, a movable member C, a drive mechanism D, and a control panel E as shown in FIGS. The main body A includes a base 3 composed of a lower frame body 1 framed by a frame 1a and a surface plate 2 assembled on the frame body 1, and an upper frame framed on the base 3 by a frame 4a. It consists of a framework 4. Further, the upper frame body 4 is provided with a transparent opening / closing door 5, a start button 6, and an operation unit 7 for carrying in / out a work (not shown). The start button 6 and the operation unit 7 are electrically connected to the control panel E.

  The fixing member B is fixed to the upper end portions of the four guide rods 8 erected on the base 3. In this embodiment, the fixing member B is attached to the fixed surface plate 11 and the fixed surface plate 11. The upper heating board 12 is comprised. The upper heating plate 12 includes a heating unit (heating mold) 13 disposed at a portion facing the movable member C, and a cooling unit 14 disposed between the heating mold 13 and the fixed surface plate 11. It is equipped with. The heating unit 13 includes a heater 13a disposed at a predetermined position so that the workpiece can be uniformly heated, and the cooling unit 14 heats the workpiece and then heats the heating unit 13 An air nozzle 14a inserted in a predetermined position is provided for cooling.

The movable member C is disposed between the base 3 and the fixed member B, and is inserted into the guide rod 8 through a holder 8a so as to be slidable and movable up and down. Then, it comprises a movable surface plate 21 and a lower heating plate 22 attached to the movable surface plate 21. The lower heating plate 22 is similar to the upper heating plate 12 in that a heating part (heating mold) 23 disposed at a portion facing the fixing member B, the heating mold 23 and the movable surface plate 21 are provided. And a cooling unit 24 disposed between the two. The heating unit 23 incorporates a heater 23a disposed at a predetermined position so that the workpiece can be uniformly heated, and the cooling unit 24 heats the workpiece and then heats the heating unit 23. An air nozzle 24a inserted in a predetermined position is provided for cooling.
The heating settings such as the heating time and heating temperature of the heaters 13a and 23a and the cooling settings such as the supply time and supply amount of the air nozzles 14a and 24a can be selected as appropriate.

The drive mechanism D is disposed inside the base 3 and is rotated by two drive nuts that are screwed to a single ball screw shaft at a predetermined interval by the respective drive motors. It is a mechanism that raises and lowers C. Each nut and the drive motor are arranged one-on-one. In the present embodiment, a ball screw shaft 31 suspended from the lower surface of the movable surface plate 21 of the movable member C via a coupling mechanism D1, and a first nut 32 screwed into the upper end portion of the ball screw shaft 31. The first rotation transmission mechanism D2 that transmits the rotation to the first nut 32, the first drive motor 33 that rotationally drives the first nut 32 via the first rotation transmission mechanism D2, and the first nut 32 A second nut 34 that is screwed to the ball screw shaft 31 in a lower part, a second rotation transmission mechanism D3 that transmits rotation to the second nut 34, and the second nut via the second rotation transmission mechanism D3. And a second drive motor 35 that rotationally drives 34.
Further, in the present embodiment, as the coupling mechanism D1, the detent arm member 36 whose outer peripheral end is guided by the guide rod 8 and whose central portion is coupled to the upper end flange portion 31a of the ball screw shaft 31, and the movable Although a mechanism comprising a connecting ring member 37 for fitting and fixing to the protrusion 21a formed on the lower surface of the surface plate 21 is employed, the mechanism is not particularly limited to this, and other mechanisms are used. It may be employed, or may be omitted and directly connected.
Further, since both the first rotation transmission mechanism D2 and the second rotation transmission mechanism D3 can be the same mechanism, in the present embodiment, the first rotation transmission mechanism D2 will be described, and the second rotation transmission mechanism D3 will be described. Omits the explanation. The first rotation transmission mechanism D2 is wound around a pulley 38 attached to the outer periphery of the first nut 32, a pulley 39 attached to an output shaft on the speed reducer side of the first drive motor 33, and both pulleys 38, 39. A mechanism comprising a timing belt 40, a bearing portion 41 attached to the outer peripheral portion of the end of the first nut 32, and a guide rod 42 for slidably guiding the bearing portion 41 is employed. The bearing portion 41 includes a bearing 41a, an inner member 41b, an outer member 41c, a side plate 41d, and a nut 41e. The upper end of the guide rod 42 is fixed to the surface plate 2 of the base 3.
As the first drive motor 33 and the second drive motor 35, a servo motor with a reduction gear, a servo motor, or a direct drive servo motor can be used.

The control panel E includes a drive control unit E1 that controls the raising and lowering operation of the movable member C by the drive mechanism D, a temperature control unit (not shown) that controls the heaters 13a and 23a, and the like.
As shown in FIG. 4, the drive controller E <b> 1 includes a first driver 51 electrically connected to the first drive motor 33 and a second driver electrically connected to the second drive motor 35. 52 and a controller 53 electrically connected to the first driver 51 and the second driver 52. The first driver 51 and the second driver 52 detect torques to the first drive motor 33 and the second drive motor 35 connected to the drivers 51 and 52, and the torques are detected by the first nut 32 and the second driver 52. The two nuts 34 are driven so as not to exceed the allowable load capacity. The first drive motor 33 and the first driver 51 are connected by an electric wire 54a for position control and an electric wire 54b for torque control, and the second drive motor 35 and the second driver 52 are controlled by position control. The electric wire 55a for electric power and the electric wire 55b for torque control are connected. As an instrument for detecting the position of the movable member C driven by the first drive motor 33 and the second drive motor 35, an encoder (not shown) built in the first drive motor 33 and the second drive motor 35 is used. ) Can be used. Further, as an instrument for detecting the torque of the first drive motor 33 and the second drive motor 35, a torque monitor built in the first drive motor 33 and the second drive motor 35 can be used.

In the present embodiment, the first driver 51 and the second driver 52 drive the first drive motor 33 and the second drive motor 35 based on the position command signal received from the controller 53. . Thereby, the position of the first drive motor 33 and the second drive motor 35 is controlled (hereinafter simply referred to as position control / position control).
However, when the initial position of the first nut 32 and the second nut 34 is slightly different during the assembling work of the drive mechanism D, the initial time applied to the first nut 32 and the second nut 34 is different. Since the load factors are different, for example, the second drive motor 35 receives the load first, the load is concentrated on the second drive motor 35 and the second nut 34, and the life is shortened. Further, when the second drive motor 35 receives a load first and the first drive motor 33 is idle, the control of the first drive motor 33 and the second drive motor 35 collides with each other and the behavior becomes unstable, and hunting ( Periodic fluctuations) may occur.

Therefore, according to the present invention, the position control of the first drive motor 33 and the torque control of the second drive motor 35 can be performed as other control relating to the present embodiment (hereinafter simply referred to as position control / torque control). Called). That is, the first driver 51 drives the first drive motor 33 based on the position command signal received from the controller 53, detects the current torque of the first drive motor 33, and detects the torque. The second drive motor 35 can be driven using a torque command signal to the second drive motor 35. In the present invention, the present invention is not limited to this, and the position of the second drive motor 35 can be controlled and the torque of the first drive motor 33 can be controlled.
In another control according to the present embodiment, the positions of the first nut 32 and the second nut 34 (load contact conditions) are aligned at the time of initial torque control, and then switched to position control. Hunting that occurred early in position control does not occur.
However, since the first drive motor 33 and the second drive motor 35 are equipped with a speed reducer, the motor torque and load are unlikely to be in a proportional relationship, and the speed is reduced when the drive motors 33 and 35 are rotated from the normal rotation to the reverse rotation. The speed reduction mechanism of the machine becomes resistance and torque may hunt suddenly.
However, when the first drive motor 33 and the second drive motor 35 are not a drive motor with a speed reducer or a direct drive motor, the torque of the speed reducer suddenly disappears from the normal rotation to the reverse rotation. Therefore, in this case, control can be performed without causing hunting.

In the present invention, as yet another control according to the present embodiment, the position of the first drive motor 33 is controlled at an initial stage until the workpiece is pressurized, and the second drive motor 35 is torque-controlled. During the pressurization, the position of the first drive motor 33 and the second drive motor 35 can be controlled by switching the control. That is, the first driver 51 drives the first drive motor 33 based on the position command signal received from the controller 53, detects the current torque of the first drive motor 33, and detects the torque. Of the position received by the first driver 51 and the second driver 52 from the controller 53 when pressurizing the workpiece, after driving the second drive motor 35 as a torque command signal to the second drive motor 35. Based on the command signal, the first drive motor 33 and the second drive motor 35 can be driven.
In the present embodiment, the position of the first drive motor 33 and the second drive motor 35 are controlled after the position of the first drive motor 33 is controlled and the torque of the second drive motor 35 is controlled. However, the present invention is not limited to this. The position of the second drive motor 35 is controlled, the torque of the first drive motor 33 is controlled, and then the first drive motor 33 and the second drive are controlled. The position of the motor 35 can be controlled.
In yet another control according to the present embodiment, the positions of the first nut 32 and the second nut 34 (load contact condition) are aligned at the time of initial torque control, and then switched to position control. • Hunting that occurred early in position control does not occur. Further, since the control is switched before the speed reducer starts playing, the above-described hunting of position control / torque control does not occur.
Therefore, in the present invention, in order to obtain high-accuracy control without depending on the accuracy of the assembly operation of the drive mechanism and the resistance of the reduction gear, control for switching from the position control / torque control to the position control / position control is performed. It turns out that it is preferable to do.

1 is a front view in which a pressure molding device according to an embodiment of the present invention is partially cut away. It is the right view which abbreviate | omitted a part of drive mechanism in the pressure molding apparatus of FIG. It is an enlarged view of the drive mechanism of FIG. It is a block diagram for demonstrating the control in this invention.

Explanation of symbols

A body B fixed member C movable member D drive mechanism E control panel E1 drive control unit 1 lower frame 1a, 4a frame 2 surface plate 3 base 4 upper frame 5 open / close door 6 start button 7 operation unit 8 guide rod 8a holder 11 Fixed surface plate 12 Upper heat plate 13, 23 Heating unit 13a, 23a Heater 14, 24 Cooling unit 14a, 24a Air nozzle 21 Movable surface plate 21a Projection unit 22 Lower heat plate 31 Ball screw shaft 31a Flange unit 32 First nut 33 First 1 drive motor 34 2nd nut 35 2nd drive motor 36 arm member 37 connecting ring member 38, 39 pulley 40 timing belt 41 bearing portion 41a bearing 41b inner member 41c outer member 41d side plate 41e nut 42 guide rod 51 first driver 52 first driver 52 2 driver 53 controller 54a, 54b,
55a, 55b Electric wire

Claims (7)

A main body having a base at the bottom;
A fixing member fixed to the upper ends of the four guide rods erected on the base;
A movable member inserted into the guide rod between the base and the fixed member so as to be movable up and down;
A drive mechanism for moving the movable member up and down inside the base;
A pressure molding apparatus comprising: a control panel having a drive control unit that controls a lifting operation of the movable member by the drive mechanism;
The drive mechanism includes a ball screw shaft suspended from the movable member, a first nut screwed into an upper end portion of the ball screw shaft, a first rotation transmission mechanism that transmits rotation to the first nut, A first drive motor that rotationally drives the first nut via a first rotation transmission mechanism, a second nut that is screwed to a ball screw shaft below the first nut, and transmission of rotation to the second nut And a second drive motor that rotates the second nut via the second rotation transmission mechanism, and the nuts and the drive motors are arranged on a one-to-one basis. The drive control unit is electrically connected to the first driver electrically connected to the first drive motor, the second driver electrically connected to the second drive motor, and the first driver and the second driver. 2. The pressure molding apparatus according to claim 1, further comprising a controller to be connected. The pressure molding apparatus according to claim 2, wherein the first driver and the second driver drive the first drive motor and the second drive motor based on a position command signal received from the controller. One of the first driver and the second driver is connected to the one driver based on the command signal of the position received from the controller by one of the first driver and the second driver. And the current torque of the one drive motor is detected, and the other drive motor is used as a torque command signal to the other drive motor of the first drive motor and the second drive motor. The pressure molding apparatus of Claim 2 which drives. One of the first driver and the second driver is connected to the one driver based on the command signal of the position received from the controller by one of the first driver and the second driver. And the current torque of the one drive motor is detected, and the other drive motor is used as a torque command signal to the other drive motor of the first drive motor and the second drive motor. The first driver and the second driver drive the first drive motor and the second drive motor based on a position command signal received from the controller when the workpiece is pressurized after driving. Pressure molding device. The first driver and the second driver detect torques to the first drive motor and the second drive motor connected to the first driver and the second driver, and use the torques for the first nut and the second nut. The pressure molding apparatus according to claim 2, which is driven so as not to exceed an allowable load capacity. 3. The fixed member includes a fixed surface plate and an upper heat platen attached to the fixed surface plate, and the movable member includes a movable surface plate and a lower heat platen attached to the movable surface plate. The pressure molding apparatus according to 3, 4, 5 or 6.