JP3802805B2 - Hot press molding method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hot press molding method and a hot press apparatus for performing press molding by heating and pressurizing a molded product between hot plates, and particularly used for raising a hot plate and the like, and for pressing a molded product. The present invention relates to a method for controlling a pump that is a hydraulic source of a hydraulic mechanism or a pump for a hot press apparatus. Furthermore, the present invention relates to detection means used for controlling the hydraulic mechanism.
[Prior art]
[0002]
The hot press molding method is a molding method that is significantly different from other presses in that the molded product such as a laminate is heated and pressed over a long period of 1 to 3 hours. Since the time is about 30 seconds, as a result, the ratio of the rising time of the hot plate or the like in one molding cycle is extremely small as compared with the heating / pressurizing time. Therefore, conventionally, as shown in Japanese Examined Patent Publication No. 4-2360, the rising of the hot plate and the pressurization of the molded product are performed by a single constant discharge type pump without taking into consideration the rising time of the hot plate or the like. I went. The constant discharge type pump used in this apparatus is a pump having a discharge amount necessary for supplying oil into the large-diameter cylinder when the hot plate or the like is raised, and a discharge pressure necessary for pressurizing the press-molded product. Is used. However, in the case of the constant discharge type pump of this apparatus, the hydraulic pressure in the cylinder is controlled by the same discharge amount as when the hot plate or the like is raised even during pressurization of the press-molded product, which is wasteful in terms of energy efficiency. There were many.
[0003]
In addition, as shown in registered utility model No. 30148863, there is a method in which the cylinder has a two-stage structure, a small-diameter cylinder is used when the hot plate or the like is raised, and a large-diameter cylinder is used to press the pressed product. There is a problem that the structure of the cylinder becomes complicated, leading to an increase in manufacturing cost.
Furthermore, it is conceivable to solve the problem by using a variable pump as the pump of the hydraulic mechanism of the hot press apparatus. However, when raising the hot plate, etc., it is necessary to secure a large discharge amount to the cylinder, to ensure a predetermined discharge pressure during long press forming, and to make the discharge amount an efficient low discharge amount. However, there is too much difference in the optimum discharge amount in each case, and it is difficult to apply a constant pressure for a long time with a variable pump that is generally used, and control in a low rotation region is possible. It has been difficult to perform the control because of instability.
[0004]
[Problems to be solved by the invention]
The present invention was made in view of the above circumstances, and in a hot press molding method and apparatus thereof that requires a long pressurization time of a press molded product, without increasing the rate of rise when the hot plate or the like is raised, The purpose is to efficiently drive the pump during heating and pressurization of the press-molded product to improve energy efficiency. Or it aims at suppressing the manufacturing cost of the equipment for it.
[0005]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a hot press molding method comprising a movable plate that is moved up and down by a hydraulic mechanism with respect to an upper plate, and presses a plurality of hot plates between the upper plate and the movable plate. In a hot press molding method in which a molded product is disposed, the movable platen is raised, and the press molded product is heated and pressed between the hot plates for a long time, the hydraulic source of the hydraulic mechanism is driven by a motor A large-capacity pump having a large discharge amount and a small-capacity pump driven by a motor different from the motor and having a smaller discharge amount and a higher discharge pressure than the large-capacity pump. Are connected to cylinders that both raise the movable platen and pressurize the press-formed product. When raising the movable platen, the large-capacity pump and the small-capacity pump are driven to feed oil to the cylinder. And exercising the delay timer is stopped driving the large capacity pump motor at a predetermined timing, characterized by pressurizing the press molded product by driving only the small-capacity pump.
[0006]
Therefore, when the hot plate rises, oil is supplied to the cylinder from both the large-capacity pump and the small-capacity pump, and the hot plate can be raised, and the delay pump works to stop the large-capacity pump at a predetermined timing. As a result, when the press-molded product is pressurized, the pressurization can be efficiently performed by driving the small capacity pump.
[0007]
According to a second aspect of the present invention, there is provided a hot press molding method comprising a movable plate that is moved up and down by a hydraulic mechanism with respect to the upper plate, and presses a plurality of hot plates between the upper plate and the movable plate. In a hot press molding method in which a molded product is disposed, the movable platen is raised, and the press molded product is heated and pressed between the hot plates for a long time, the hydraulic source of the hydraulic mechanism is driven by a motor A large-capacity pump having a large discharge amount and a small-capacity pump driven by a motor different from the motor and having a smaller discharge amount and a higher discharge pressure than the large-capacity pump. Are respectively connected to cylinders that both raise the movable platen and pressurize the press-formed product, and the hydraulic mechanism has hydraulic pressure detecting means for detecting the hydraulic pressure of the cylinder or a pipe line communicating with the cylinder. When raising the movable platen, the large-capacity pump and the small-capacity pump are driven to feed oil to the cylinder, and the hydraulic pressure detection means detects that the hydraulic pressure of the hydraulic mechanism is equal to or higher than a predetermined pressure. Then, the driving of the motor of the large-capacity pump is stopped, and the press-formed product is pressurized by the driving of only the small-capacity pump .
[0008]
Therefore, it is possible to stop the large-capacity pump by detecting that pressurization of the press-molded product between all hot plates is started and the hydraulic pressure in the cylinder starts to rise, and pressurizing efficiently It can be performed.
[0009]
According to a third aspect of the present invention, there is provided a hot press molding method comprising a movable plate that is moved up and down by a hydraulic mechanism with respect to the upper plate, and presses a plurality of hot plates between the upper plate and the movable plate. In a hot press molding method in which a molded product is disposed, the movable platen is raised, and the press molded product is heated and pressed between the hot plates for a long time, the hydraulic source of the hydraulic mechanism is driven by a motor A large-capacity pump having a large discharge amount and a small-capacity pump driven by a motor different from the motor and having a smaller discharge amount and a higher discharge pressure than the large-capacity pump. Are respectively connected to cylinders that perform both raising of the movable platen and pressurization of the press molded product, and provided with position detecting means for detecting the raised position of the hot plate, movable platen or press molded product, and the movable platen. When ascending, the large-capacity pump and the small-capacity pump are driven to feed oil to the cylinder, and when the rising position of the hot plate, movable platen or press-molded product is detected by the position detection means, The drive of the motor is stopped, and the press-formed product is pressurized by the drive of only the small capacity pump .
[0010]
Therefore, by detecting the rising position of the hot plate, the movable platen or the press-molded product, the large capacity pump can be stopped and the pressurization can be performed efficiently.
[0011]
According to a fourth aspect of the present invention, there is provided a hot press molding method comprising a movable plate that is moved up and down by a hydraulic mechanism with respect to the upper plate, and presses a plurality of hot plates between the upper plate and the movable plate. In a hot press molding method in which a molded product is disposed, the movable platen is raised, and the press molded product is heated and pressed between the hot plates for a long time, the hydraulic source of the hydraulic mechanism is driven by a motor A large-capacity pump having a large discharge amount and a small-capacity pump driven by a motor different from the motor and having a smaller discharge amount and a higher discharge pressure than the large-capacity pump. Are respectively connected to cylinders that perform both raising of the movable platen and pressurization of the press molded product, and provided with position detecting means for detecting the raised position of the hot plate, movable platen or press molded product, and the movable platen. When ascending, the large-capacity pump and the small-capacity pump are driven to feed oil to the cylinder, and when the rising position of the hot plate, movable platen or press-molded product is detected by the position detection means, The driving of the motor is stopped, and the movable platen is raised at a lower speed by driving only the small capacity pump, and then the press-formed product is pressurized .
[0012]
The hot press molding method according to claim 5 of the present invention is the hot press molding method according to any one of claims 1 to 4, wherein the large capacity pump and the small capacity pump are constant discharge type pumps. It is characterized by.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, in order to clarify the present invention, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a hot press apparatus of the present invention and its hydraulic mechanism. FIG. 2 shows the detection means of the hot press apparatus according to the second embodiment of the present invention.
[0014]
In FIG. 1, reference numeral 1 denotes a hot press apparatus. As is well known, a movable platen 3 that can be moved up and down with respect to an upper platen 2 is provided, and a hot plate 4 as a press plate is interposed between them. A plurality of (seven in addition to the uppermost heating plate 4a in this embodiment) are arranged at a predetermined distance. A ram 6 of a cylinder 5 is attached to the movable plate 3, and the movable plate 3 is moved together with the ram 6 by feeding oil from a plurality of pumps 8, 9 which are hydraulic sources of a hydraulic mechanism to the cylinder chamber 7 of the cylinder 5. Be raised. As the movable platen 3 is raised, the hot plates 4 except the uppermost hot plate 4a are also raised, and a press-molded product 10 such as a laminated printed wiring board disposed on each hot plate 4 is interposed between the hot plates 4. It is heated and pressurized and press-molded. In the present invention, the cylinder 5 both raises the movable platen 3 and pressurizes the press-molded product 10.
[0015]
An example of the hydraulic mechanism of the hot press apparatus 1 will be described in detail. In the cylinder chamber 7 of the cylinder 5, a small capacity pump 8 driven by a motor M1 and a large capacity pump 9 driven by a motor M2 are connected via a pipe line or the like. It is connected.
The small capacity pump 8 is mainly used for pressurization of the press-molded product 10 and has a smaller discharge amount and higher discharge pressure than the large capacity pump 9. In this embodiment, a constant discharge amount type gear pump is used, and a maximum discharge amount of 15 liters / min (when the discharge pressure is 9 MPa) is used. As an example of this embodiment, it is desirable for the small capacity pump 8 to have a maximum discharge amount of 10 liter / min to 20 liter / min and a maximum discharge pressure of about 8 MPa to 20 MPa. And in the case of the hot press apparatus 1, although the required applied pressure changes with the areas of the molded object 10, the thing to about 20 Mpa is used.
[0016]
The large-capacity pump 9 is for sending a large volume of oil to the cylinder chamber 7 of the cylinder 5 when the movable platen 3 is raised, and has a larger discharge amount and lower discharge pressure than the small-capacity pump 8. It is done. In an example of this embodiment, a constant discharge amount type screw pump is used as the large capacity pump 9, and a maximum discharge amount of 300 liters / min (when the discharge pressure is 0.3 MPa) is used. The large-capacity pump 9 depends on the volume of the cylinder chamber 7, but it is desirable that the maximum discharge amount be about 200 liter / min to 400 liter / min as an example.
In addition, about a pump, you may use another kind of well-known pump, and you may use the variable pump by inverter control etc. for each or one side.
[0017]
A pipe 13 is connected to the large capacity pump 9 connected to the tank 12 toward the cylinder chamber 7, and a check valve for preventing a backflow of oil to the large capacity pump 9 is provided in the pipe 13. 14 is provided. On the other hand, a pipe 15 is connected from the small-capacity pump 8 connected to the tank 12 toward the cylinder chamber 7, and the pipe 15 is connected to the cylinder 15 at a portion closer to the cylinder chamber 7 than the check valve 14 of the pipe 13. A pipeline 13 is connected.
[0018]
A three-way solenoid valve 16 is provided in the pipe line 15, the A port of the three-way solenoid valve 16 is connected to the pipe line 15 toward the cylinder chamber 7, and the B port is a pilot type check valve described later. 17 is connected to a pilot line 18 to 17. The A port side pipe line 15 is provided with a check valve 19 for preventing back flow of oil to the small capacity pump 8 side. In addition, a relief valve 20 is provided branching from a pipe line 15 between the three-way electromagnetic valve 16 and the small capacity pump 8.
[0019]
By the check valves 14 and 19, the pipes 13a and 15a on the cylinder chamber 7 side from the check valves 14 and 19 in the pipes 13 and 15 have the same pressure as the cylinder chamber 7, and the pipe 13a 15a, a variable electromagnetic relief valve 21 (unload valve) is provided. Further, a pilot check valve 17 is provided branching off from the pipelines 13a and 15a, and the pilot check valve 17 is provided by the hydraulic pressure from the pilot pipeline 18 connected from the B port of the three-way solenoid valve 16 as described above. The valve 17 is opened so that the oil in the cylinder chamber 7 is returned to the tank. Further, a pressure switch PS1 for outputting a rise confirmation signal is connected to the pipelines 13a and 15a as a hydraulic pressure detection means so that the hydraulic pressure in the cylinder chamber 7 and the pipelines 13a and 15a can be detected. The pressure switch PS1 is connected to the control means 22, and the motor M2 of the large capacity pump 9 is stopped and the variable electromagnetic relief valve 21 is controlled via the control means 22.
[0020]
The hot press apparatus 1 is provided with a limit switch LS1 for detecting the lower limit position of the movable platen 3 and a limit switch LS2 as position detecting means for detecting the upper limit position of the movable platen 3. Then, by detecting the upper limit position of the movable platen 3 using LS2, control programs such as temperature control of the hot plate 4 and pressure control of the cylinder 5 for heating and pressurizing the press-molded product 10 are started.
[0021]
Next, an example of a press molding method using the hot press apparatus 1 will be described with reference to FIG.
When the press-molded product 10 in which the laminated material and the mirror plate are overlapped is arranged on each hot plate 4 of the hot press apparatus 1 by a loader (not shown), the door of the hot press apparatus 1 is closed. When it is detected by a detection means (not shown) that the door is closed, a pump for evacuating the vacuum chamber 11 is activated. The vacuum gauge detects that the inside of the vacuum chamber 11 has reached a predetermined vacuum pressure, the motor M2 is driven via the control means 22, and the large capacity pump 9 is driven.
[0022]
On the other hand, the small capacity pump 8 is driven throughout the entire process, and the oil sent from the small capacity pump 8 is unloaded from the pilot check valve 17 when the molded product 10 is loaded. When the vacuum gauge detects that the vacuum chamber 11 has reached a predetermined vacuum pressure, the solenoid C of the three-way solenoid valve 16 is actuated via the control means 22 almost simultaneously with the driving of the large capacity pump 9. The three-way solenoid valve 16 is switched to the solenoid C side, and the pilot check valve 17 is closed.
[0023]
Then, oil is fed from the large-capacity pump 9 and the small-capacity pump 8 to the same cylinder chamber 7 where both the movable platen 3 is raised and the press-molded product 10 is pressurized, and the ram 6 of the cylinder 5 is raised and attached to the ram 6. The movable platen 3 is raised at a predetermined speed. At this time, the variable electromagnetic relief valve 21 is set to be relatively low because the large-capacity pump 9 having a low discharge pressure is driven. The movable platen 3 sequentially pushes up the plurality of hot plates 4 and the press-molded product 10 on the hot plate, and the press-formed product 10a arranged on the second hot plate 4b from the top eventually becomes the uppermost hot plate 4a. Abut.
[0024]
Even if the press-molded product 10a comes into contact with the uppermost heat plate 4a, oil is still sent from the large capacity pump 9 and the small capacity pump 8 into the cylinder chamber 7, so that the cylinder chamber 7 and the pipe line 13a, The hydraulic pressure of 15a rises, and in the example of this embodiment, when the hydraulic pressure reaches 0.45 MPa, the pressure switch PS1 is activated. When the pressure switch PS1 is turned on, a rise confirmation signal is output, the current to the motor M2 is cut off via the control means 22, and the driving of the large capacity pump 9 is stopped. As an example, the set value of the pressure switch PS1 is set to about 0.4 MPa to 0.6 MPa. Therefore, the predetermined timing for stopping the large-capacity pump 9 in the present invention includes after the pressurization of the press-molded product 10 is started, but the pressure inside the cylinder chamber 7 is necessary for pressurization of the press-molded product 10. It is the state before becoming.
[0025]
After the large-capacity pump 9 is stopped, only the remaining small-capacity pump 8 is driven so that low discharge amount and high discharge pressure oil is sent to the cylinder chamber 7 to pressurize the press-formed product 10. Then, when the limit switch LS2 is detected next, program control for heating and pressurizing the press-molded product 10 is started, and temperature control of the hot plate 4 is started. The set pressure of the variable electromagnetic relief valve 21 is switched to the high pressure side, and the hydraulic pressure in the cylinder chamber 7 is controlled in multiple stages while the press-molded product 10 is pressurized by the variable electromagnetic relief valve 21. As an example, the pressure in the cylinder chamber 7 is preferably in the range of about 8 MPa to 20 MPa.
[0026]
In this embodiment, the rising time of the hot plate 4 and the like is scheduled to be 30 seconds, and the heating / pressurization time of the press-molded product 10 is scheduled to be 2.5 hours. For example, the rising time of the hot plate 4 is about 20 seconds to 1 minute, and the heating / pressurizing time of the press-molded product 10 is about 1 hour to 3 hours.
[0027]
When the pressurization of the press-molded product 10 is completed, the pressure setting of the variable electromagnetic relief valve 21 is lowered by the command from the control means 22 and the pressure is released. Next, the solenoid O of the three-way solenoid valve 16 is activated, the supply of oil from the small capacity pump 8 to the pipe line 15a through the A port of the three-way solenoid valve 16 is shut off, and only from the B port to the pilot pipe line 18 Oil is supplied, the pilot check valve 17 is opened, and the oil in the cylinder chamber 7 and the pipelines 13 a and 15 a is returned to the tank 12. As the hydraulic pressure in the cylinder chamber 7 decreases, the ram 6 is lowered by its own weight, and at the same time, the movable platen 3 and the like are also lowered.
[0028]
Next, the second embodiment is shown in FIG. 2, and as a position detecting means in which a projector 23 and a light receiver 24 are mounted in the vicinity of the lower surface of the uppermost hot plate 4a of the hot press apparatus 1. A photoelectric sensor 25 is provided. The photoelectric sensor 25 is composed of a transmission type fiber sensor, and a projector 23 is attached to a frame (not shown) on one side in the vacuum chamber 11, and a light receiver 24 is attached to a frame (not shown) on the other side. An optical axis 26 from 23 to the light receiver 24 is provided so as to scan slightly below the lower surface of the uppermost heat plate 4a from one side to the other side in parallel with the heat plate 4a. In this embodiment, the position of the optical axis 26 of the photoelectric sensor 25 is set 5 mm below the lower surface of the hot plate 4a.
[0029]
When the movable platen 3 or the like is raised, the press-formed product 10a disposed on the second hot plate 4b from the top is detected by blocking the optical axis 26 of the photoelectric sensor 25 as the position detecting means, When the photoelectric sensor 25 is turned on (or off), a rise confirmation signal is transmitted to the control means 22. Then, the drive of the large-capacity pump 9 is stopped via the control means 22, and the rising speed of the movable platen 3 or the like is reduced, so that the impact on the press-formed product 10 is buffered. Alternatively, after the press molded product 10a is detected by the photoelectric sensor 25, the delay timer may be operated to stop the large-capacity pump 9, or the discharge amount of the variable pump may be controlled.
[0030]
Although the photoelectric sensor 25 is described as being mounted in the vacuum chamber 11, a lens is provided on the wall of the vacuum chamber 11, or the wall of the vacuum chamber 11 is made of transparent glass or the like, and the photoelectric sensor 25 is placed outside the vacuum chamber 11. In this case, an amplifier type may be used.
Further, photoelectric sensors 25 are attached below all the hot plates 4 to detect the presence or absence of sticking of the molded product 10 to the lower surface of the hot plate 4 when the hot plate 4 is lowered, and hot press the molded product 10 by a take-out machine. You may make it prevent the taking-out mistake from the apparatus 1. FIG.
[0031]
The present invention is not limited to the above embodiment, and the position detecting means uses the limit switch LS2 instead of the photoelectric sensor 25, and the movable plate 3 or the hot plate 4 except the uppermost hot plate 4a is raised. The position may be detected, an increase confirmation signal may be output based on the detection timing, and the large capacity pump 9 may be stopped via the control means 22. As for the position to be detected, the limit switch LS2 detects the position where the molded product 10a arranged on the second hot plate 4b from the top is in contact with the uppermost heat plate 4a or just before the contact. Then, the large capacity pump 9 may be stopped.
[0032]
Further, the position detecting means uses a laser sensor provided in the vicinity of the lower surface of the uppermost hot plate in place of the photoelectric sensor 25 to detect the raised position of the hot platen 4 excluding the movable platen 3 or the uppermost hot plate 4a. Alternatively, an increase confirmation signal may be output based on the detection timing, and the large capacity pump 9 may be stopped via the control means 22. In this case, the laser sensor may be a transmission type or a reflection type.
[0033]
In the above-described embodiment, the hot press device 1 that is a combination of a large capacity pump and a small capacity pump is described as an example of a plurality of pumps. One pump may be stopped. For large hot presses, for example, two large-capacity pumps, two medium-capacity pumps, and two small-capacity pumps are provided, and the pumps are selectively stopped by detection means such as pressure switches, limit switches, and photoelectric sensors. You may make it make it. In pressurizing and heating the press-molded product 10, energy-efficient molding can be performed by the remaining medium capacity pump and / or small capacity pump. As described above, the present invention does not limit the number of pumps, the discharge amount, and the discharge pressure provided in plural, and various combinations other than those described above are also included in the technical idea of the present invention.
[0034]
Furthermore, the cylinder 5 used in the present invention performs both raising of the movable platen 3 and pressurization of the molded product 10, and a plurality of pumps (for example, a large capacity pump 9 and a small capacity pump 8) are the same cylinder 5. The number of cylinders 5 is not limited to one as long as they are connected to each other, and may be two or more. Therefore, when there are a plurality of cylinders 5, it is sufficient if at least one of the plurality of pumps connected to one of the cylinders is stopped at a predetermined timing and the remaining cylinders are pressurized. .
In addition to the position of the cylinder 5 provided on the machine base, for example, a plurality of cylinders are provided above the upper board 2, the rods of the cylinders are coupled to the movable board, and the rods are contracted so that the movable board is retracted. A so-called pitless type may be used.
Further, the hot press apparatus 1 may be one without the vacuum chamber 11.
[0035]
【The invention's effect】
The present invention provides a large-capacity pump and a small-capacity pump having a smaller discharge amount and higher discharge pressure than the large-capacity pump as the hydraulic source of the hydraulic mechanism of the hot press apparatus , and both pumps are connected to the same cylinder, and a movable plate is provided. When raising, press both the large-capacity pump and the small-capacity pump to feed oil to the cylinder, stop driving the large-capacity pump at a predetermined timing, and pressurize the press molding by driving the small-capacity pump In comparison with a conventional hot press device that uses the same pump to raise and press the hot plate, etc., the large capacity pump is stopped during the pressurization time and only the small capacity pump is driven. This has the effect of reducing the power consumption of the motor that drives the pump. Moreover, since a complicated cylinder is not used, the manufacturing cost of equipment can be suppressed.
[0036]
In addition, a photoelectric sensor or laser sensor is provided near the lower surface of the uppermost hot plate as a position detecting means for the hot plate of the hot press device, so that the position of the press molded product is detected without directly contacting the hot plate. In particular, when the thickness of the press-formed product is changed, there is an effect that it is not necessary to finely adjust the detection means based on troublesome calculation. Furthermore, the ascending speed of the movable platen can be reduced immediately before the press-molded product and the lower surface of the hot plate abut, and the impact on the press-molded product can be buffered.
[Brief description of the drawings]
FIG. 1 is a view showing a hot press apparatus of the present invention and a hydraulic mechanism thereof.
FIG. 2 is a diagram showing detection means of a hot press apparatus according to a second embodiment of the present invention.
[Explanation of symbols]
1 ……… Hot press device 2 ……… Upper plate 3 ……… Movable platen 4 ……… Hot plate 5 ……… Cylinder 6 ……… Ram 7 ……… Cylinder chamber 8 ……… Small capacity pump 9… ...... Large-capacity pump 10 ... Molded article 11 ... Vacuum chamber 12 ... Tank 13 ... Pipe 14 ... Check valve 15 ... Pipe 16 ... Three-way solenoid valve 17 ... Pilot check valve 18... Pilot line 19... Check valve 20... Relief valve 21... Variable electromagnetic relief valve 22... Control means 23. ... Motor M2 ... Motor PS1 ... Pressure switch LS1 ... Limit switch LS2 ... Limit switch

Claims (5)

A movable plate that is moved up and down by a hydraulic mechanism is provided with respect to the upper plate, a press-molded product is disposed on a plurality of hot plates between the upper plate and the movable plate, and the movable plate is raised to move the heat plate In a hot press molding method in which heating and pressurization of a press-molded product is performed between plates for a long time ,
The hydraulic source of the hydraulic mechanism includes a large capacity pump driven by a motor and having a large discharge amount, and a small capacity pump driven by a motor different from the motor and having a smaller discharge amount and a higher discharge pressure than the large capacity pump. The large-capacity pump and the small-capacity pump are respectively connected to cylinders that perform both raising of the movable platen and pressurization of the press-molded product,
When raising the movable platen, the large-capacity pump and the small-capacity pump are driven to feed oil to the cylinder, and a delay timer is operated to stop driving the motor of the large-capacity pump at a predetermined timing. A method of forming a hot press, wherein the press-formed product is pressurized by only driving. A movable plate that is moved up and down by a hydraulic mechanism is provided with respect to the upper plate, a press-molded product is disposed on a plurality of hot plates between the upper plate and the movable plate, and the movable plate is raised to move the heat plate In a hot press molding method in which heating and pressurization of a press-molded product is performed between plates for a long time ,
The hydraulic source of the hydraulic mechanism includes a large capacity pump driven by a motor and having a large discharge amount, and a small capacity pump driven by a motor different from the motor and having a smaller discharge amount and a higher discharge pressure than the large capacity pump. The large-capacity pump and the small-capacity pump are respectively connected to cylinders that both raise the movable platen and pressurize the press-formed product, and the hydraulic mechanism has a hydraulic pressure of the cylinder or a pipe line communicating with the cylinder. Oil pressure detecting means for detecting is provided,
When the movable platen is raised, the large-capacity pump and the small-capacity pump are driven to feed oil to the cylinder. When the hydraulic pressure detection means detects that the hydraulic pressure of the hydraulic mechanism is equal to or higher than a predetermined pressure, A hot press molding method, wherein driving of a motor of a capacity pump is stopped, and a press-molded product is pressurized only by driving of a small capacity pump. A movable plate that is moved up and down by a hydraulic mechanism is provided with respect to the upper plate, a press-molded product is disposed on a plurality of hot plates between the upper plate and the movable plate, and the movable plate is raised to move the heat plate In a hot press molding method in which heating and pressurization of a press-molded product is performed between plates for a long time ,
The hydraulic source of the hydraulic mechanism includes a large capacity pump driven by a motor and having a large discharge amount, and a small capacity pump driven by a motor different from the motor and having a smaller discharge amount and a higher discharge pressure than the large capacity pump. The large-capacity pump and the small-capacity pump are respectively connected to cylinders that perform both ascent of the movable platen and pressurization of the press-formed product, and position detection for detecting the ascending position of the hot plate, movable platen or press-formed product. Means are provided,
When the movable platen is raised, the large-capacity pump and the small-capacity pump are driven to feed oil to the cylinder, and the raised position of the hot plate, movable platen or press-molded product is detected by the position detecting means. A hot press molding method, wherein driving of a motor of a large-capacity pump is stopped, and a press-molded product is pressurized only by driving of a small-capacity pump. A movable plate that is moved up and down by a hydraulic mechanism is provided with respect to the upper plate, a press-molded product is disposed on a plurality of hot plates between the upper plate and the movable plate, and the movable plate is raised to move the heat plate In a hot press molding method in which heating and pressurization of a press-molded product is performed between plates for a long time ,
The hydraulic source of the hydraulic mechanism includes a large capacity pump driven by a motor and having a large discharge amount, and a small capacity pump driven by a motor different from the motor and having a smaller discharge amount and a higher discharge pressure than the large capacity pump. The large-capacity pump and the small-capacity pump are respectively connected to cylinders that perform both ascent of the movable platen and pressurization of the press-formed product, and position detection for detecting the ascending position of the hot plate, movable platen or press-formed product. Means are provided,
When the movable platen is raised, the large-capacity pump and the small-capacity pump are driven to feed oil to the cylinder, and the raised position of the hot plate, movable platen or press-molded product is detected by the position detecting means. A hot press molding method comprising: stopping a motor of a large-capacity pump, raising a movable plate by lowering an ascent rate by driving only a small-capacity pump , and then pressurizing a press-molded product. The hot press molding method according to any one of claims 1 to 4, wherein the large capacity pump and the small capacity pump are constant discharge type pumps.

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