JP2022190233A - Press device and press device control method - Google Patents

Abstract

To provide a press device which can perform accurate control even if conditions such as a weight of molding at the time of pressure molding are changed and so on, and a press device control method.SOLUTION: A press device 11, which lifts a molding M1 placed on a lower pressurizing component 21 together with the lower pressurizing component 21 and pressurizes together between the lower pressurizing component and an upper pressurizing component 19, comprises: pressurizing means 15 for pressurizing the molding M1; a sensor 27 which detects a pressure or a load of the pressurizing means 15; and a sensor 22 which detects a distance between the lower pressurizing component 21 and the upper pressurizing component 19 or a distance of the lower pressurizing component 21 with respect to a press device main body part 12. The molding M1 is brought into contact with the upper pressurizing component 19. The press device further comprises a control device 29 which detects a force of the pressurizing means 15 in the state that gravity combined with the molding M1, the lower pressuring component 21, and portions 16, 17, 18, M2 that are lifted together with the lower pressurizing component 21 and the force of the pressurizing means 15 are balanced.SELECTED DRAWING: Figure 2

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press device and a control method of the press device that raises a molded article placed on a lower pressure member together with the lower pressure member and presses it with the upper pressure member. be.

The press device includes a press device that lowers an upper pressurizing member against the molding placed on the lower pressurizing member and presses it with the lower pressurizing member, and a lower pressurizing member. There is a press device that raises a molding placed on a pressure member together with a lower pressure member and presses it with an upper pressure member. In the case of the latter press device, since the weight of the upper pressurizing device is not added to the pressurizing force, it is easier to perform pressurization control with higher precision than the former press device. In the latter press device, even when the pressurizing means is a single-acting hydraulic cylinder, the lower pressurizing member can be easily lowered (mold opening). For this reason, the latter press apparatus is used as a hot press apparatus for applying pressure between hot plates for a relatively long period of time.

As an example of a press device that lifts the molding placed on the latter lower pressure member together with the lower pressure member and presses it with the upper pressure member, there are patent documents 1 and 2. are known. In Patent Document 1, when the hydraulic press device is performing surface pressure control by the hydraulic pressure control means, the distance is restricted to prevent the plate thickness from changing beyond a predetermined value, and the plate thickness is controlled by the distance control means. It is described that when the contact pressure is being applied, the contact pressure is restricted to prevent the contact pressure from changing beyond a predetermined level. Further, in Patent Document 2, a pump capable of controlling the rotation speed and changing the discharge amount is used as the hydraulic pressure source of the press device, and the pump is controlled to control the pressurization process in the low pressure range of the set hydraulic pressure of 2 MPa or less. is described.

JP-A-63-242500 JP 2012-35317 A

However, both the press apparatus of Patent Document 1 and the press apparatus of Patent Document 2 strictly reflect the weight of the molded product and the weight of the pressurizing member such as a hot plate on which the molded product is placed in the pressure control etc. in the pressurizing process. It wasn't what it was supposed to be. Regarding this point, although it is stated in [0026] of Patent Document 2 that the actual surface pressure p2 cannot be obtained by calculation unless the weight of the pressure plate etc. is subtracted, how is the weight of the pressure plate etc. calculated? However, there is no description as to whether it is reflected in pressure molding.

Therefore, in view of the above problems, the present invention provides a press device and a control method for the press device that can perform accurate control even when conditions such as the weight of the molded product during pressure molding are changed. intended to provide

Other problems and novel features will become apparent from the description of the specification and the accompanying drawings.

A press device according to claim 1 of the present invention is a press device that lifts a molded article placed on a lower pressure member together with the lower pressure member and presses it with the upper pressure member. In, pressurizing means for pressurizing the molded product, a sensor for detecting the pressure or load of the pressurizing means, the distance between the lower pressurizing member and the upper pressurizing member, or the press device main body A sensor for detecting the distance of the lower pressure member is provided. A control device is provided for detecting the force of the pressurizing means in a state where the force of the pressurizing means is balanced with the gravity including the part that rises together with the pressurizing member.

The press apparatus of the present invention is a press apparatus in which a molded article placed on a lower pressure member is lifted together with the lower pressure member and pressed between the upper pressure member and pressurizes the molded article. pressure means for pressing, a sensor for detecting the pressure or load of the pressure means, the distance between the lower pressure member and the upper pressure member or the lower pressure member with respect to the main body of the press device and a sensor for detecting the distance between the molded product and the lower pressure member and the lower pressure member while the molded product is in contact with the upper pressure member. Since the control device is provided to detect the force of the pressurizing means in a state where the force of the pressurizing means is balanced with the gravity combined with the portion where the pressure is applied, the conditions at the time of pressure molding such as the weight of the molded product are not changed. Accurate pressurization control can be performed even in the case of Further, the same effect can be obtained with the control method of the press device of the present invention.

FIG. 4 is a schematic view of the pressing device of the present embodiment when a molding is placed; FIG. 4 is a schematic diagram of the press device of the present embodiment during a reference pressure detection step; FIG. 4 is a flow chart for control of a reference pressure detection process of the press device of the present embodiment; FIG. 5 is a diagram showing a method of calculating a reference pressure in control of a reference pressure detection process of the press device of the present embodiment;

A press apparatus according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. The press device 11 of the present embodiment is a multi-stage hot press, in which a molding placed on a lower pressure member is lifted together with the lower pressure member, and is pressed between the upper pressure member. pressure.

The structure of the press device 11 will be described. An upper platen 12 which is a press body portion fixedly provided on the upper side of the press device 11 and a lower platen 13 on the lower side are connected by tie bars 14 . A pressurizing cylinder 15 as pressurizing means is attached to the lower platen 13 . A pressurizing cylinder 15 which is attached to the lower platen 13 side and is a press main body portion is provided with a ram 16 that moves up and down with respect to a cylinder portion 15a. A lower hot plate 18 as a pressure member is fixedly attached to the upper surface of the movable platen 17 . An upper hot plate 19 as a pressure member is also attached to the lower surface of the upper platen 12 .

Further, between the lower hot plate 18 and the upper hot plate 19, an intermediate hot plate 21 placed on a mounting portion (not shown) and raised as the lower hot plate 18 rises is movably attached. Although one intermediate hot plate 21 is provided in the example of FIG. When there are a plurality of intermediate hot plates 21, the uppermost intermediate hot plate 21 serves as the lower pressure member whose distance from the upper platen 12 is measured. The hot plates 18, 19, and 21 are rectangular metal plates each having a smooth pressure surface and having a predetermined thickness. A passage is formed. Alternatively, heaters may be provided in the hot plates 18, 19 and 21 for direct heating.

One detecting portion 22a of a position sensor 22 is attached to the side surface of the upper platen 12 of the press device 11, and the detected portion 22b of the position sensor 22 is attached to the side surface of the intermediate hot plate 21. As shown in FIG. Accordingly, the position sensor 22 is a sensor for detecting the distance of the intermediate hot plate 21, which is the lower pressing member, with respect to the upper platen 12, which is the main body of the press. In this embodiment, a non-contact laser sensor or ultrasonic sensor is used as the position sensor 22, but a linear scale or the like may be used, and the type is not limited. The position sensor may be attached so that the position between the upper hot plate 19 and the intermediate hot plate 21 attached to the upper platen 12 is directly measured. Further, the position sensor may be one that measures the distance between the lower platen 13, which is the main body of the press, and the intermediate hot plate 21, or one that detects the elevation position of the ram 16, or the like. If the distance between the hot plates 19 and 21 is detected by the position sensor 22, the distance between the hot plates can be detected more accurately. It may be disadvantageous if it is exposed and the life of the position sensor is shortened.

A limit switch 23 is attached inside the upper board 12 . The limit switch 23 can detect that the molding M1 contacts the upper hot plate 19 due to the operation of the pressurizing cylinder 15 . The limit switch 23 may be attached to the side surface of the upper platen 12 or the side surface of the upper hot plate 19 to detect that the intermediate hot plate 21 has risen to the contact position. Also, the limit switch 23 is not essential in the present invention. Furthermore, in this embodiment, the press device 11 is housed in a chamber (not shown) that can be separated from the outside world, and a vacuum pump (not shown) of a vacuum device is connected to the chamber. However, the press device 11 may be pressurized in the atmosphere without a chamber.

The pressurizing cylinder 15 of the present embodiment is a single-acting cylinder, and has only a pressurizing oil chamber 15b inside the cylinder portion 15a, and has a simplified structure. However, the pressurizing cylinder 15 of the pressurizing means may be a double-acting cylinder having a pressurizing oil chamber and a lowering oil chamber. The pressurizing cylinder 15 is connected via a conduit 24 to a rotation speed control pump 25 capable of controlling the rotation speed of the pump. A switching valve 26 is provided in the middle of the pipe 24 to select whether to supply or stop the supply of hydraulic oil. Further, a pressure sensor 27 for detecting the pressure of the hydraulic oil in the pressurizing cylinder 15 is attached to the pipeline 24 or the pressurizing oil chamber 15b of the pressurizing cylinder 15. As shown in FIG. The pressure sensor 27 is a sensor that detects the pressure of the pressurizing means. In this embodiment, the rotation speed control pump 25 is a bidirectionally rotatable gear pump, and the rotation speed of the pump can be controlled by a servomotor 28 . Hydraulic oil is supplied from the tank 20 to the pressurizing cylinder 15 when the rotational speed control pump 25 is rotated forward, and hydraulic oil is returned to the tank 20 when it is rotated in the reverse direction. However, the type of the rotation speed control pump is not limited to a gear pump, and may be an axial piston pump or the like, and may not be a pump that feeds hydraulic oil in both directions. The rotation speed control pump 25 may be a motor other than the servomotor 28 operated by an inverter as long as the rotation speed can be closed-loop controlled. Alternatively, a pressure control type relief valve or the like may be connected to the pipeline 24 of the hydraulic circuit.

A control device 29 is attached to the press device 11 . The control device 29 is often composed of a plurality of control devices including the servo amplifier 30, but is conceptually illustrated as one device here. The controller 29 is connected to the servomotor 28 of the rotation speed control pump 25 and is capable of controlling the current value supplied to the servomotor 28 and the like. It is also connected to the rotary encoder 31 of the servomotor 28, and detects the number of revolutions of the servomotor 28 to enable closed-loop control. The controller 29 is also connected to the solenoid of the switching valve 26 .

Further, the control device 29 is connected to the position sensor 22, the limit switch 23, the pressure sensor 27, and other temperature sensors (not shown) so that the state of the press device 11 can be detected. A storage unit (not shown) in the control device 29 stores a program for sequence-controlling a reference pressure detection process and a pressurization process, which will be described later. is possible. The control device 29 is configured so that the molding M1 is brought into contact with (closely attached to) the upper hot plate 19, which is the upper pressing member, and the molding M1, the intermediate hot plate 21, which is the lower pressing member, and the lower heating plate. It is the gravity combined with the portion (here, the ram 16 + movable platen 17 + lower hot plate 18 + molding M2 placed on the lower hot plate 18) that rises together with the intermediate hot plate 21, which is a pressure member, and pressurizing means. It has a function of performing pressurization control of the pressurizing process using the pressure (force) of the pressurizing means in a state in which the pressure (force) of the pressurizing cylinder 15 is balanced as a reference pressure (reference force).

2, a flow chart of FIG. 3, and a diagram showing a method of calculating the reference pressure of FIG. A detection process will be described. First, as shown in FIG. 1, moldings M2 and M1 such as circuit boards are placed on the upper surface of the lower hot plate 18 and the upper surface of the intermediate hot plate 21, respectively. In general, the circuit boards placed on one hot plate 19, 21 are formed by stacking a plurality of press plates, etc., and the weight of each circuit board to be pressure-molded differs.

Next, the chamber is closed and the chamber is evacuated, or the reference pressure detection process is started while the chamber is open. In the reference pressure detection step, the servo motor 28 is driven to drive the rotational speed control pump 25 by closed loop control, and hydraulic oil is supplied to the pressurizing oil chamber 15b of the pressurizing cylinder 15 via the opened switching valve 26. Supply (s1). As a result, the molded product M2 placed on the movable platen 17 and the lower hot plate 18 is raised together with the ram 16, and the molded product M2 comes into contact with the lower surface of the intermediate hot plate 21 provided movably.

A limit switch 23 detects that the molding M1 and the upper hot plate 19 attached to the upper platen 12 are brought into contact with each other (S2=Y). The contact between the upper hot plate 19 and the molding M1 may be determined by the fact that the pressure sensor 27 detects that the pressure sensor 27 has risen from a certain point. When the limit switch 23 or the like detects that the molding M1 is brought into contact with the upper hot plate 19, and sent to the controller 29, the reference pressure detection step is started.

In the reference pressure detection step, the control device 29 controls the servomotor 28 of the rotation speed control pump 25 (in this case, reverse rotation control) to gradually reduce the pressure (force) of the pressurizing cylinder 15 (s3). At this time, the control of the target pressure of the rotational speed control pump 25 is set so that the later target pressure is lower than the previous target pressure every predetermined time or every scan cycle. At this time, the target pressure drop width is set to a width other than the minimum value. Then, the pressure is gradually decreased by closed-loop control so that the pressure of the pressurizing cylinder 15 follows the target pressure that is sequentially set toward the decreasing direction. Alternatively, at this time, the element of flow rate control may be incorporated to control the pressure drop rate.

When the position sensor 22 detects that the distance of the intermediate hot plate 21, which is the pressure member on the lower side with respect to the upper plate 12, has increased (s4), it corresponds to the force detected by the pressure means at that time. The pressure sensor 27 detects the pressure 1A of the pressurizing cylinder 15 (detection value of the pressure sensor 27) and stores it in the storage section of the controller 29. FIG. The distance between the upper platen 12 and the intermediate hot plate 21 is directly measured by the position sensor 22. The upper hot plate 19, which is the upper pressure member, and the intermediate heat plate 19, which is the lower pressure member, are directly measured. The distance of the plate 21 is also measured indirectly at the same time. At this time, the contact between the lower surface of the upper hot plate 19 and the upper surface of the molded product M1 may be temporarily eliminated, or if the molded product M1 has elasticity, the contact state may be maintained. .

Next, the servo motor 28 of the rotation speed control pump 25 is rotated forward according to a command from the control device 29 to re-supply hydraulic oil to the pressurizing oil chamber 15b of the pressurizing cylinder 15, thereby increasing the pressure (force) of the pressurizing cylinder 15. is gradually increased (s5). At this time, the control of the target pressure of the rotation speed control pump 25 is set so that the later target pressure is higher than the previous target pressure every predetermined time or every scan cycle. The increase width of the target pressure at this time is set to a width other than the minimum value. Then, the pressure is gradually increased by closed-loop control so that the pressure of the pressurizing cylinder 15 follows the target pressure that is sequentially set in the upward direction. Alternatively, at this time, the element of flow rate control may be incorporated to control the pressure rise speed. At the same time, the position sensor 22 detects the distance between the upper platen 12 and the intermediate hot plate 21, and when it is detected that the distance has become smaller (s6), the servomotor 28 of the rotation speed control pump 25 rotates forward. The pressure of the pressurizing cylinder 15 (detected value of the pressure sensor 27) 1B corresponding to the force detected from the pressurizing means at that time is stored in the storage section of the control device 29. FIG.

At this time, the molded product M1, the intermediate hot plate 21, and the portion that is lifted by the pressing means together with the intermediate hot plate (here, the ram 16 + movable platen 17 + lower hot plate 18 + molded product M2) are combined gravity and pressurizing means. If the pressure (force) of the pressurizing cylinder 15 can be balanced, the reference pressure detection step is completed. Note that the state in which the gravity and the pressure are in balance is not limited to a state in which the pressure is perfectly balanced in terms of computation, and may be a state in which the intermediate hot plate 21 does not substantially move up and down.

However, in the present embodiment, achieving a state in which the gravity and the pressure (force) are balanced by one pressure drop control and one pressure rise control of the pressurizing cylinder 15 is hardly assumed. Therefore, the pressure of the pressurizing cylinder 15 when the intermediate hot plate 21, etc. descends (the value detected by the pressure sensor 27) measured and stored last time and the pressure of the pressurizing cylinder 15 when the intermediate hot plate 21, etc. ascends (Detected value of pressure sensor 27) By increasing or decreasing the pressure of the pressure cylinder 15 within the range between 1B, the gravity and the pressure (force) are balanced, and the intermediate hot plate 21 and the like rise. Start the control to search for the pressure of the pressurizing cylinder 15 that does not drop or drop (s7)

When the target pressure is lowered by operating the rotational speed control pump 25 for the second time by, for example, rotating it in the reverse direction, the pressurizing cylinder 15 is controlled within the controllable target pressure every predetermined time or every scan cycle. A command value is sent from the control device 29 to the servo motor 28 of the rotation speed control pump 25 so that the target pressure with a smaller pressure fluctuation range is sequentially set and the pressure is gradually lowered more slowly than the previous time ( s8). Then, the position sensor 22 detects that the distance between the upper platen 12 (including the upper hot plate 19), which is the upper pressure member, and the intermediate hot plate 21, which is the lower pressure member, has increased (s9 ) and the pressure of the pressurizing cylinder 15 at that time (detected value of the pressure sensor 27) 2A are stored in the storage section of the control device 29. FIG.

Next, the servo motor 28 of the rotation speed control pump 25 is rotated forward according to a command from the control device 29 to re-supply hydraulic oil to the pressurizing oil chamber 15b of the pressurizing cylinder 15, thereby increasing the pressure (force) of the pressurizing cylinder. Gradually increase (s5). At this time, the pressure of the pressurizing cylinder (detected value of the pressure sensor 27) when the intermediate hot plate descends this time and the pressure of the pressurizing cylinder (detected value of the pressure sensor 27) when the intermediate hot plate rises last time ) Within the range between 1B, set values are sequentially set such that the range of pressure fluctuations for each predetermined time period or for each scan cycle is smaller than that of the first time, and the target pressure is gradually increased more slowly than the previous time. A set pressure for the pressurizing cylinder 15 is determined, and a command value is transmitted from the control device 29 to the servo motor 28 of the rotation speed control pump 25 . Then, the pressure (force) of the pressurizing cylinder 15 is gradually increased more gently than last time (s10). Note that the pressure may be increased at a relatively high speed up to the vicinity of the hydraulic oil pressure 1B detected in the previous time (s64), and then the pressure may be increased at a low speed from there. At the same time, the position sensor 22 detects the distance between the upper platen 12 and the intermediate hot plate 21, and when it is detected that the distance has become smaller (s11), the servomotor 28 of the rotation speed control pump 25 rotates forward. The pressure of the pressurizing cylinder 15 at that time (detected value of the pressure sensor 27) 2B is stored in the storage unit.

When the pressure of the pressure cylinder 15 decreases or increases, the distance between the upper plate 12 as the upper pressure member and the intermediate hot plate 21 as the lower pressure member fluctuates within a predetermined value or does not fluctuate. The control from (s8) to (s11) is repeated until there is no change in the distance of the intermediate hot plate 21 (when the pressure (force) of the pressurizing cylinder 15 and the gravity of the intermediate hot plate 21 are balanced), The pressure increase control or pressure decrease control of the pressurizing cylinder 15 is ended (s12).

In the flowchart of FIG. 3, after the initial pressure increase control and pressure decrease control of the pressure cylinder 15,
An example is described in which the pressure increase control and the pressure decrease control of the pressurizing cylinder 15 are repeated until the gravity and the pressure (force) are balanced by the pressure decrease control and the pressure increase control of the pressurizing cylinder 15. As for the number of times of pressure increase control and pressure decrease control, it is assumed that the pressure applied by the pressure means (the force that raises the intermediate hot plate 21, which is the pressure member on the lower side, and the molding M1) is zero (0). It is premised that it is generated, and the number of times N is not limited. Further, the reference pressure detection step may be ended when the pressure (increase force) with which the pressurizing means pressurizes the molding M1 becomes zero in either process of pressure increase control or pressure decrease control.

Also, as shown in FIG. 4, which shows the method of calculating the reference pressure, the control of the reference pressure detection process is performed when the first distance detected by the position sensor 22 begins to increase. Pressure 1A, hydraulic oil pressure 1B at which the first distance detected by the position sensor 22 began to decrease, and hydraulic oil pressure 2A, 2 at which the second distance detected by the position sensor 22 began to increase. It is desirable to decrease the range of vertical movement of the hydraulic oil pressure in the pressurizing cylinder 15 while sequentially obtaining the hydraulic oil pressure 2B when the distance detected by the position sensor 22 for the first time starts to decrease. Then, the pressure of the pressurizing cylinder 15 when the variation of the distance by the position sensor 22 disappears is stored in the storage section of the control device 29 as the reference pressure (reference force) of the pressurizing cylinder 15 in the pressurizing step (s13). . That is, the intermediate hot plate 21 of the pressurizing cylinder 15 and the molded product M1 are lifted while the molded product M1 is in contact with (closely attached to) the upper hot plate 19 which is the upper pressing member. A state of zero force is generated, and the force detected from the pressurizing cylinder 15 at that time (value of pressure detected by the pressure sensor 27) is stored as a reference pressure in the storage unit. Pressurization control of the pressurization process is performed using the

In the example of FIG. 4, the pressure of the pressurizing cylinder 15 is increased to increase the distance between the upper platen 12 (including the upper hot plate 19), which is the upper pressurizing member, and the intermediate hot plate 21, which is the lower pressurizing member. is reduced, and the pressure of the pressure cylinder 15 is lowered to reduce the distance between the upper platen 12 (including the upper hot plate 19), which is the upper pressure member, and the intermediate hot plate 21, which is the lower pressure member. After performing the control to increase the distance four times, there is no change in the distance at the fifth operation (the state in which the pressure applied to the molding M1 by the pressure cylinder 15 is zero = the molding M1 and the lower pressure member and the portion that rises together with the lower pressurizing member and the force of the pressurizing means are in equilibrium). However, the pressure increase control or pressure decrease control of the pressurizing cylinder 15 is performed at least once or more, and when the pressure increase control or pressure decrease control of the pressurizing cylinder 15 is performed, the lower side of the upper plate 12 of the press apparatus main body is pressurized. The variation in the distance of the intermediate hot plate 21, which is a member, or the variation in the distance between the upper hot plate 19, which is the upper pressing member, and the intermediate hot plate 21, which is the lower pressing member, is within a predetermined value or the variation is eliminated. The pressure (force) detected from the pressurizing means at the point of time (when the rising force of the pressurizing means is zero) may be used as the reference pressure (reference force) of the pressurizing means in the pressurizing process. .

The state in which the force for raising the pressure member of the pressurizing means is zero when the molding M1 placed on the intermediate hot plate 21 and the upper hot plate 19 are in contact (close contact state) means that the molding M1 The force acting in the direction of pushing up the molding M1 and the intermediate hot plate 21 from the pressurizing cylinder 15 side is substantially zero, and the molding M1 and the intermediate hot plate 21 are not pressed toward the upper hot plate 19. be. The force generated in the pressurizing cylinder 15 at this time is detected by the pressure sensor 27 as the pressure of the working oil, but is naturally a positive pressure. Then, the pressurization control of the next pressurization process is performed based on the pressure (force) of the hydraulic oil. As for the pressure (force) of the hydraulic oil, there is a range as long as it is possible to keep the molding M1 in contact with the upper hot plate 19 and neither rising nor falling. good too.

When the molding M1 is in contact with the upper hot plate 19 and the rising force of the pressurizing cylinder 15 is zero, the pressing force applied to the molding M1 is zero or nearly negligible. However, since the gravity of the intermediate hot plate 21 and the molded product M1 acts on the molded product M2 placed on the lower hot plate 18, the pressing force applied to the molded product M2 is not zero. However, if an auxiliary cylinder or the like is used to lift the intermediate hot plate 21 upward, the pressing force of the molding M2 placed on the lower hot plate 18 can be reduced to zero or near zero. If the auxiliary cylinder or the like is not used, the pressing force for all the moldings can be made zero when the rising force by the pressurizing cylinder 15 is set to zero. This is only the case where the molding M2 is pressure-molded between the upper hot plates 19 provided in the .

The reference pressure obtained in the reference pressure detection step (in the case of an electric motor, the reference force in the reference force detection step) is used for control in the next pressing step. The reference pressure obtained in the reference pressure detection step in the pressurization step may be used as the origin for control, and the control device 29 substitutes the reference pressure into an arithmetic expression to generate a command value and the like. may be used. Alternatively, a command value or the like used in the pressurizing process or the like may be set by interposing calculation by the operator with respect to the reference pressure. Specifically, the force of the pressurizing means is balanced with the combined gravity of the molding M1, the lower pressurizing member, and the portion that rises together with the lower pressurizing member. If the detected value of the hydraulic pressure of the pressure cylinder 15 is 3.0 MPa, the pressure cylinder 15 in the pressurizing process may be controlled by replacing the 3.0 MPa with 0 MPa. Further, the reference pressure may be used when setting the set pressure of the pressure cylinder 15 so as to obtain a desired surface pressure for the molding.

The present invention is not limited to the examples of the embodiments described above, and may be as follows. If the press device 11 lifts the molding placed on the lower pressure member together with the lower pressure member and presses it with the upper pressure member, the shape of the pressure member is The heat plates 18, 19 and 21 are not limited to flat ones. Either one of the pressure member of the upper mold and the pressure member of the lower side may be a mold with concave portions, and the other may be a mold with convex portions.

The upper hot plate 19 on the side of the upper platen 12 of the press device 11 is held by a holding portion provided on the upper platen 12, and when the limit switch 23 is detected or when pressure is applied thereafter, the lower surface of the upper platen 12 and the upper platen are pressed together. The upper surface of the upper hot plate 19 raised with respect to 12 may be brought into contact (close contact). When the upper hot plate 19 is only held, the distance between the upper hot plate 19 and the intermediate hot plate 21 detected by the position sensor 22 attached to the upper plate 12 of the upper hot plate 19 is can be easily measured. However, in other cases, the force of the pressurizing cylinder 15 to raise the intermediate hot plate 21 and the like is zero, the upper hot plate 19 is held by the holding portion, and the upper surface of the molding M1 and the upper hot plate The position sensor 22 indirectly measures the distance between the upper hot plate 19 and the intermediate hot plate 21 when the lower surfaces of the plates 19 are in contact (close contact) (excluding the influence of thermal expansion). When the upper hot plate 19 of the press device 11 is only held by the upper platen 12, the pressure of the pressurizing means is first gradually lowered in the reference pressure detection step, and the upper hot plate 19 is lowered slightly. The control of (S3) in the flow chart of FIG. 3 of the present invention is started from the time when it is held by the holding portion.

As disclosed in Japanese Unexamined Patent Application Publication No. 2002-307467, the press apparatus is provided with a plurality of clamping side cylinders (pressurizing means) on the upper platen, and the rods of the clamping side cylinders are attached to the lower movable platen. Anything is fine. In the case of this device, by increasing or decreasing the pressure in the oil chamber on the mold clamping side below the piston head of the mold clamping side cylinder, the movable platen, the lower hot plate, the intermediate hot plate, etc. are raised and lowered. The pressure in the oil chamber on the mold clamping side is detected when the clamping side cylinder pressure is balanced with the gravity of the member and the rising force of the mold clamping side cylinder is zero.

The press device 11 includes pressurizing means such as a pressurizing cylinder 15 that pressurizes the molding M1 and the like from below, and also lifts the molding M1 and the like together with a lower pressure member 21 and the like to a pressurization start position. A means for elevating the pressure member for moving or lowering it to the mold opening position may be separately provided. Elevating means for the pressure member is composed of a cylinder such as a hydraulic cylinder, an electric motor such as a servomotor, a ball screw mechanism, or the like. In this case, it is common to operate the pressurizing means after locking the raised lower pressurizing member to a tie bar or the like with a half nut or the like.

Further, the pressure control of the pressurizing cylinder 15 of the press device 11 may be performed without using the rotation speed control pump 25 for controlling the rotation speed. That is, pressure control may be performed by a pressure control valve capable of closed-loop control of hydraulic fluid sent from a pump that does not involve rotational speed control. In the case of a press device using a pressure control valve, the set value for decreasing the pressure and the set value for increasing the pressure in the reference pressure detection step are controlled by the control device 29 to control the pressure control valve.

In the pressure drop control of the pressurizing cylinder 15 in the reference pressure detection step of the present invention, the pressure of the pressurizing cylinder 15 is lowered for the second time from the pressure 1A stored when the intermediate hot plate 21 and the like are lowered for the first time. When reducing the pressure, the pressure may be lowered at a relatively high speed up to the vicinity of the pressure 1A, and then the pressure may be lowered at a lower speed. Also in the pressure increase control, when increasing the pressure of the pressurizing cylinder 15 for the second time with respect to the pressure 1B memorized when the intermediate hot plate 21 and the like rise for the first time, the pressure up to the vicinity of the pressure 1B is relatively low. It is possible to increase the pressure at a high speed and then increase the pressure at a low speed. Furthermore, the pressure reduction control of the pressurizing cylinder 15 is performed by reducing the pressure due to leakage of hydraulic oil from the pressurizing cylinder 15 and the hydraulic circuit without performing control by the rotation speed control pump 25 and the pressure control valve at least in part. may be performed. The method using hydraulic fluid leakage can be expected to provide accurate control due to a gradual decrease in pressure, although it takes time.

The pressing means of the press device 11 may be one using an electric motor such as a servomotor. In this case, a combination of a ball screw and a ball screw nut is preferably used as a mechanism for transmitting pressure from the electric motor to the pressure member on the lower side. However, a booster mechanism such as a toggle mechanism or a crank mechanism may also be used. Also, when an electric motor is used, the electric motor for the pressurizing means and the electric motor for raising and lowering the lower pressurizing member may be separate motors. Further, when the pressurizing means of the press device 11 is a servomotor, the sensor for detecting the distance between the upper pressurizing member and the lower pressurizing member may be a rotary encoder attached to the servomotor. A position sensor such as a provided linear scale may be used. When an electric motor is used as the pressurizing means, the load (force) is generally detected by a load cell. good. By simply increasing or decreasing the current value to the electric motor, the torque of the electric motor is increased or decreased, and the displacement of the lower pressure member at that time is detected, and the current value (load) and torque (load) at that time are detected. load) may be detected and used as a reference force. As for the press machine using an electric motor such as a servo motor, the electric motor as a pressurizing means is provided on the upper plate side, and the lower movable plate to which the ball screw nut is inserted is attached to the upper plate. It may be a method of pulling up toward and pressurizing.

The moldings to be pressure-molded in the press machine may be moldings such as various circuit boards, semiconductors, prepregs, resin boards, fiber resin boards, wood plywood, and ceramics. As for the pressurization time, it is effective in cases where the pressurization is performed for a certain period of time or longer (for example, 30 seconds to 10 hours, although not limited to this). On the contrary, it is not preferable, if not impossible, to apply the present invention to a metal stamping press or the like that applies instantaneous pressure. In addition, the present invention is more advantageously used when the weight and thickness of the molding are variable. The weight of the molded product placed on one pressure member is not limited to this, but as an example, when a molded product weighing 1 kg or more is placed on one hot plate, the present invention is preferably used.

Furthermore, the present invention is preferably used when the conditions during pressure molding are changed in addition to when the weight of the molded product is changed. For example, it is preferably used when the temperature of the hydraulic oil used in the pressurizing cylinder 15 changes depending on the season in which the press device 11 is used or the molding conditions. Furthermore, when the temperature of the hot plates 18, 19, 21 of the press device 11 is changed due to the change in the type of molded product, the hot plates 18, 19, 21 and other members of the press device 11 are affected by thermal expansion. It is also suitably used in such cases.

In addition, although the present invention is not enumerated one by one, it is not limited to the above-described embodiments and other variations, and modifications made by those skilled in the art based on the spirit of the present invention, the embodiments and variations It goes without saying that the combination of each of the descriptions in is also applied.

11 press device 12 upper board (press device main body)
13 Lower plate (main body of press device)
14 tie bar 15 pressurizing cylinder (pressurizing means)
16 Ram 17 Movable platen 18 Lower hot plate 19 Upper hot plate (upper pressure member)
20 Tank 21 Intermediate hot plate (lower pressure member)
22 position sensor (sensor)
23 Limit switch 24 Pipe line 25 Rotational speed control pump 26 Switching valve 27 Pressure sensor (sensor)
28 servo motor (motor)
29 control device 30 servo amplifier 31 rotary encoder

Claims (5)

In a press device that raises a molding placed on a lower pressure member together with the lower pressure member and presses it with the upper pressure member,
a pressurizing means for pressurizing the molding;
a sensor that detects the pressure or load of the pressurizing means;
a sensor for detecting the distance between the lower pressure member and the upper pressure member or the distance of the lower pressure member with respect to the main body of the press device;
In a state in which the molded product is in contact with the upper pressure member, the weight of the molded product, the lower pressure member, and the portion that rises together with the lower pressure member; A press device comprising a control device that detects the force of the pressurizing means in a state of equilibrium with the force of the pressurizing means. The pressurizing means is a combination of a pressurizing cylinder and a rotation speed control pump capable of controlling the rotation speed of the motor,
2. The press apparatus according to claim 1, wherein the sensor for detecting pressure or load of said pressurizing means is a pressure sensor for detecting pressure of hydraulic oil. In the method for controlling a press device, the molding placed on the lower pressure member is lifted together with the lower pressure member and pressed between the upper pressure member,
raising the molding and the lower pressure member toward the upper pressure member;
generating a state in which a force for lifting the molded article and the lower pressure member is zero by the pressure means in a state where the molded article is in contact with the upper pressure member;
A method for controlling a press device, wherein the force of the pressurizing means is detected in a state in which the pressurizing means lifts the molding and the lower pressurizing member in a state of zero. 4. The method of controlling a press device according to claim 3, wherein the pressure means in the pressure step is controlled based on the force detected by said pressure means. In the method for controlling a press device, the molding placed on the lower pressure member is lifted together with the lower pressure member and pressed between the upper pressure member,
When it is detected that the molded product and the lower pressure member are lifted toward the upper pressure member and the molded product is brought into contact with the upper pressure member, a reference pressure detecting step is started. ,
In the reference pressure detection step,
Gradually lowering the pressure of the pressurizing means,
When it is detected that the distance between the upper pressure member and the lower pressure member has increased, the pressure of the pressure means is gradually increased, and the pressure of the upper pressure member and the lower pressure member is increased. Detecting the distance of the pressure member at least once or more,
When the pressure of the pressurizing means decreases or increases, the variation in the distance between the upper pressurizing member and the lower pressurizing member or the variation in the distance of the lower pressurizing member from the main body of the press device is within a predetermined value or A control method for a press device, wherein the pressure of the pressurizing means at the time when the fluctuation is eliminated is used as a reference pressure of the pressurizing means.

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