JP2001269800A - Press forming method, and press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressing method and a press in which production efficiency is not degraded but improved and the breakage of a press die is prevented. SOLUTION: A light projecting sensor 21a and a light receiving sensor 21b which project and receive the light in an interlocking manner with the movement of an upper die 11 of the press are installed facing each other so that the light is projected and received in the horizontal direction through a lower space corresponding to the thickness of a work 16 provided below the upper die 11 located on the limit movement position. When the light projected by the light projecting sensor 21a cannot be received by the light receiving sensor 21b, it is judged that a work 16 is stuck to the upper die 11, this state is abnormal and the press is to be stopped. When the light projected by the light projecting sensor 21a can be received by the light receiving sensor 21b, it is judge that no work 16 is not stuck to the upper die 11 and this state is normal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for press-forming while confirming whether or not a work formed by a press-forming machine is left in a press die. The present invention relates to a press-forming method and a press-forming apparatus for stopping a press-forming machine before performing a press twice after confirming the adhered work or the work adhered to a feeder.

[0002]

2. Description of the Related Art Used for package substrates for semiconductors and the like.
The ceramic substrate is made of alumina (Al_Two O _Three ) And aluminum nitride
Ceramic powder raw material consisting of minium (AlN)
Fill the cavity consisting of the lower mold and the die, and
Press molding is performed by applying pressure in upper and lower dies.
Next, the work is sandwiched between the upper and lower dies,
When the lower surface of the workpiece and the die surface are flush
Move to the roller and take out the work. Next, the upper mold
The feeder moves further away from the
In the direction of
Extruded from the machine. At the same time, the feeder
The ceramic powder held in the feeder is
The space between the lower mold and the die is filled for the work.
In the subsequent process, the extruded work is sintered in a firing furnace.
Processing and the like are performed to form a ceramic substrate. Where the press
Take out the formed work to the level of the die upper surface,
When the lower mold separates from the work, the work is moved to the upper mold
At the same time as the next press
Having the problem of damaging the mold by pressing
ing. To deal with this problem,
The molds are regularly cleaned. Also, the feeder
Fill the ceramic powder raw material and at the same time
Press the work that has been press-formed from the press-forming machine
The work is stuck at the end of this feeder
When the feeder returns, it drags the workpiece and the next
When the mold is damaged by press molding at the same time as
I have a problem. To address this issue,
Paste a sponge, etc. at the end of the
We are improving the separation from Da.

[0003]

However, the conventional press forming method as described above has the following problems. (1) The cleaning of the press die needs to be performed while the press molding machine is stopped. However, since the production efficiency is reduced, the number of cleanings is naturally limited. (2) The work that has been pulled up by the upper mold may fall on the way. (3) As a countermeasure against dragging of the work ahead of the feeder, the sponge or the like affixed becomes dirty or worn, and the work is dragged, and the generation time is not constant. (4) It is necessary to stop the press molding machine and remove the feeder to attach the sponge or the like, and if the frequency of regular replacement is increased, the production efficiency is reduced. (5) Due to the above-mentioned problems, the work is double-pressed and the press die is damaged. The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a press molding method and a molding apparatus for preventing a press mold from being damaged without lowering production efficiency, but rather improving the production efficiency. And

[0004]

According to a first aspect of the present invention, there is provided a press forming method for checking whether or not a work remains in a press die in a process of feeding the work from a press die of a press forming machine. A light-emitting sensor and a light-receiving sensor that emit and receive light in response to the movement of the upper mold of the press molding machine, by the thickness of a work provided below the upper mold at the upper limit position of movement. It is installed facing so that it can project and receive light in the horizontal direction through a substantial lower space, and if the light sensor cannot receive the light from the light sensor, it is judged that the work is attached to the upper mold If an abnormality is detected, the press forming machine is stopped, and if the light receiving sensor can receive the light emitted from the light emitting sensor, it is determined that the work is not attached to the upper mold, and the state is determined to be normal, and the press forming machine is operated. In this way, when the work gets stuck on the upper die of the press die,
Light can be emitted in conjunction with the press molding machine, detected by a sensor that can receive light, and the press molding machine can be stopped reliably,
Double punching of press molding can be prevented beforehand, and breakage of the press die can be prevented. Further, the cleaning of the press die may be performed when the press molding machine stops, and the production efficiency is rather improved.

A press forming method according to a second aspect of the present invention is a press forming method for confirming whether or not a work remains in a press die during a process of feeding the work from a press die of a press forming machine. A light sensor that emits light in conjunction with the movement of the feeder of the press molding machine is installed at a predetermined position while the work is being sent out by the feeder and when the feeder is being pulled down so that light can be emitted from above. If the work being sent out by the feeder at the position cannot be detected, or if the work is detected while the feeder is being pulled down, it is determined that there is an abnormality, the press molding machine is stopped, and the work is being sent out from the feeder by the optical sensor at the predetermined position. Is detected, and when the work is not detected during the lowering of the feeder, it is determined to be normal and the press molding machine is operated. As described above, when the work that has been pulled up by the upper mold falls from the upper mold on the way, and when the work is stuck at the tip of the feeder, the optical sensor is activated and detected in conjunction with the movement of the feeder. Therefore, it is possible to reliably stop the press molding machine, prevent double pressing in press molding, and prevent damage to the press die. Further, the sponge or the like at the end of the feeder may be replaced when the press molding machine stops, and the production efficiency is rather improved.

According to a third aspect of the present invention, there is provided a press forming method for checking whether or not a work remains in a press die in a process of feeding the work from a press die of a press forming machine. A light emitting sensor and a light receiving sensor that emit and receive light in response to the movement of the upper die of the press molding machine are provided in a lower space corresponding to a thickness of a work provided at a lower portion of the upper die at the upper limit position of movement. If the light-emitting sensor cannot receive the light emitted from the light-emitting sensor, it is judged that the work is attached to the upper mold and the abnormality is determined. When the molding machine is stopped and the light-receiving sensor can receive the light emitted from the light-emitting sensor, it is determined that the work is not attached to the upper mold and the condition is normal, the press molding machine is operated, and the press molding machine is further operated. Follow feeder movement An optical sensor that emits light while the work is being sent out from the feeder and the feeder is installed at a predetermined position while the feeder is being pulled down so that light can be emitted from above, and the light sensor is being sent out from the feeder at the predetermined position. When the work cannot be detected, or when the work is detected while the feeder is being lowered, it is determined that the work is abnormal, the press molding machine is stopped, and the optical sensor detects the work being fed by the feeder at a predetermined position. If the work is not detected while the feeder is being lowered, it is determined to be normal and the press molding machine is operated. In this way, when the workpiece is pulled up by the upper mold, when the workpiece that is pulled up by the upper mold falls from the upper mold on the way, and when the workpiece is caught at the tip of the feeder, Also, since the light can be detected by the light emitting / receiving sensor linked to the press molding machine and the optical sensor installed in the feeder section, the press molding machine can be stopped reliably.

In accordance with the first aspect of the present invention, there is provided a press forming apparatus which presses a work with a press die of a press forming machine, removes the work from the press die, and sends the work out of the press die. A press forming device that checks the presence or absence of a work remaining in a mold. The press forming device operates in conjunction with the movement of the upper mold of the press forming machine. A light-emitting sensor and light-receiving sensor that are arranged opposite to each other so that light can be emitted and received in the horizontal direction through the lower space equivalent to the thickness, and a workpiece is placed in the upper mold when the light-receiving sensor cannot receive the light emitted by the light-emitting sensor. Stops the press molding machine when it is determined that it is attached and controls the press molding machine to operate when the light-receiving sensor receives light from the light-emitting sensor and determines that the workpiece is not attached to the upper mold. Means A. As described above, the press forming machine can be reliably stopped by confirming the presence or absence of the work with the optical sensor capable of transmitting and receiving light, so that press forming by double punching is prevented beforehand, and breakage of the press die is prevented. Equipment can be provided.

According to a second aspect of the present invention, there is provided a press forming apparatus, wherein a work is pressed by a press die of a press forming machine, the work is taken out of the press die, and the work is sent out from the press die. A press forming device for checking the presence or absence of a work remaining in a mold, which operates in conjunction with the movement of a feeder of the press forming machine, and is located at a predetermined position in the middle of the work being sent out by the feeder and the middle of the withdrawal of the feeder. If the optical sensor that emits light from above and the optical sensor cannot detect a workpiece that is being fed by the feeder at a predetermined position, or if the optical sensor detects a workpiece that is being pulled down, the press molding machine is determined to be abnormal and stopped. When the optical sensor detects a workpiece that is being fed by the feeder at a predetermined position, or when the feeder is pulling down, the workpiece is detected. If not, it is determined that a normal and a control means for actuating the pressing machine. in this way,
Since the presence of a workpiece at a predetermined position can be confirmed by an optical sensor that detects the movement of the feeder, the press molding machine can be stopped without fail. An apparatus for preventing mold breakage can be provided.

According to a third aspect of the present invention, there is provided a press forming apparatus for pressing a work with a press die of a press forming machine, removing the work from the press die, and sending the work out of the press die. A press forming device that checks the presence or absence of a work remaining in a mold. The press forming device operates in conjunction with the movement of the upper mold of the press forming machine. A light-emitting sensor and light-receiving sensor that are arranged opposite to each other so that light can be emitted and received in the horizontal direction through the lower space equivalent to the thickness, and a workpiece is placed in the upper mold when the light-receiving sensor cannot receive the light emitted by the light-emitting sensor. The press molding machine is stopped when it is determined that the work is adhered, and when the light receiving sensor receives the light emitted from the light emitting sensor, it is determined that the work is not attached to the upper mold, and the press molding machine is operated. Control of 1 The step and the feeder of the press forming machine are operated in conjunction with the movement of the feeder, and an optical sensor for projecting light from above at a predetermined position while the work is being sent out by the feeder and while the work is being pulled down, and the optical sensor is positioned at a predetermined position. If it is not possible to detect the work in the middle of sending out, or if the work is detected while the feeder is being lowered, it is determined that there is an abnormality and the press molding machine is stopped, and the optical sensor detects the work in the middle of being sent out at the predetermined position by the feeder. In the case where the work is not detected during the lowering of the feeder, a second control means for determining that the work is normal and operating the press molding machine is provided. As a result, the presence or absence of a work can be confirmed by an optical sensor capable of projecting and receiving light in conjunction with the press molding machine, and the presence or absence of a work can be confirmed by an optical sensor linked to the movement of the feeder, thereby reliably stopping the press molding machine. Therefore, it is possible to provide an apparatus for preventing press forming by double punching and preventing breakage of a press die.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. Here, FIG. 1 is a schematic partial side sectional view for explaining a press forming method according to an embodiment of the present invention, and FIGS. 2A and 2B are presses according to an embodiment of the present invention, respectively. Perspective view showing the upper mold part of the molding apparatus,
FIG. 3 is a perspective view showing a feeder portion of the press forming apparatus according to one embodiment of the present invention. As shown in FIGS. 1 to 3, a press forming apparatus according to an embodiment of the present invention includes a press die of a press forming machine including an upper die 11, a lower die 12, and a die 13. Raw material 1 stored in
Feeder 14 for feeding the work 5 and a light emitting sensor 21a and a light receiving sensor 2 for detecting the presence or absence of the work 16 in the process of sending the press-formed work 16 from the press die.
1b, the optical sensor 22, and control means (first and second control means) (not shown) for determining whether or not the work 16 remains and controlling the stop and operation of the press molding machine. Prevents press molding.

Next, with reference to FIG. 1, a description will be given of a process from press molding to feeding of a workpiece in the press molding method according to one embodiment of the present invention. As shown in (1), the feeder 14 is horizontally moved to a position immediately above a gap having the lower die 12 set at a predetermined position in the die 13 of the press die as a bottom and the die 13 as a wall surface. Then, a powder raw material 15 held inside the feeder 14, for example, a ceramic powder raw material obtained by adding a binder to alumina, aluminum nitride, or the like, is filled into the gap from the bottom opening of the feeder 14. Powder raw material 15 in feeder 14
Is the injection port 14a using a hopper or a pneumatic pumping device.
Supplied by In the case of a ceramic powder raw material, for example, in the case of a ceramic powder raw material, a raw material (primary raw material) of about 2 to 5 μm is granulated into a round shape (secondary raw material) of about 80 μm. The voids are filled at a uniform density using the angle of repose so that the work is not deformed even after press molding and firing.

As shown in (2), when the feeder 14 retreats (in the direction of the arrow), the bottom surface of the feeder 14 is cut flush with the upper surface of the die 13 so that the powder material filled in the voids is cut. 15 is secured as a predetermined raw material amount capable of forming the work 16. During this time, the upper mold 11 is located above.

As shown in (3), the upper mold 11 descends, reaches the surface of the powder material 15 in the lower mold 12 and the die 13, and further descends into the die 13 at the same time as the lower mold 11. When the mold 12 starts to rise, the workpiece 16 is formed by pressing the powder raw material 15 in the die 13 with both the upper mold 11 and the lower mold 12. At this time, the pressing pressure needs to be about 800 kg / cm ² .

As shown in (4), the press pressure by the upper mold 11 and the lower mold 12 is released at the end of the press, but the work 16 is divided into the upper mold 11 and the lower mold 1.
2 and is pushed out to the upper surface of the die 13. By sandwiching the work 16 between the upper mold 11 and the lower mold 12, deformation or breakage of the work 16 caused by friction between the work 16 and the die 13 received when the work 16 is extruded from the die 13 is prevented. .

As shown in (5), the upper mold 11 rises away from the work 16 and reaches the upper limit position of movement. Then, the feeder 14 moves forward and starts pushing the work 16.
At this time, since the upper surface of the lower die 12 is flush with the upper surface of the die 13, the lower die 12 is prevented from being damaged by contact with the feeder 14, and the work 16 is prevented from being chipped by being caught by the die 13. It is carried out.

As shown in (6), the feeder 14 is further advanced, and the work 16 is sent out from the press die. At the same time, the lower die 12 starts to descend, and the powder raw material 15 is transferred to the lower die for the next work. The space formed by the mold 12 and the die 13 is filled. On the other hand, the fed work 16 is sequentially pushed by the next formed work, so that the work position 1
6a, it moves to the work position 16b. In the subsequent step, for example, when the powder raw material is ceramic, the work 16 is packed in a firing jig made of a refractory and sintered in a firing furnace. This is the process from press molding to work delivery.

Next, referring to FIGS. 1 to 3, the work 16-2 in the press forming method according to the present embodiment will be described.
The process of preventing heavy hitting will be described. As described with reference to FIG. 1 (5), the upper mold 11 rises away from the work 16, but the surface of the mold is not changed even after being used for a long time even if it is made of a cemented carbide. Rough, powdered raw material 15
Is easy to catch. In addition, if the surface of the mold is contaminated, the powder raw material 15 is liable to be caught in such a case. For this reason, the work 16 may be stuck to the upper mold 11 and rise together. As shown in FIG. 2, a light emitting sensor 21a and a light receiving sensor 21b which emit and receive light in conjunction with the movement of the upper die 11 of the press molding machine are provided below the upper die 11 at the upper limit position of the movement. When the light is emitted from the light emitting sensor 21a and cannot be received by the light receiving sensor 21b (FIG. 2).
(A)), assuming that the work 16 has adhered to the upper mold 11, the first control means (not shown) determines that the work 16 is abnormal,
The press molding machine is stopped. When the light emitted from the light emitting sensor 21a can be received by the light receiving sensor 21b (FIG. 2B), the work 16 does not exist in the lower space, that is, the work 16 is attached to the upper mold 11. If not, the first control means determines that it is normal and operates the press molding machine continuously.

Further, as described with reference to FIG. 1 (6), there is a case where the feeder 14 moves forward to send out the work 16 from the mold, and when the feeder 14 retreats, the work 16 is attracted and returned. In addition, the work 16 that has been lifted by the upper mold 11 may fall before reaching the upper limit position of the movement of the upper mold 11. In these cases, the sensor composed of the light emitting sensor 21a and the light receiving sensor 21b operates normally, so that it is not possible to catch an abnormality.
As shown in FIG. 3, the feeder 14
At a predetermined position at which the feeder 14 that pushes out the work 16 moves forward one position from the work at the position of the work 16 at the tip when the work 16 is advanced most, in conjunction with the movement of the feeder 14 of the press molding machine. When the work 16 pushed by the light sensor 22 from above and the feeder 14 extrudes to the position is not detected (the work 16 which has been lifted by the upper mold 11 reaches the upper limit of the movement of the upper mold 11). If the work 16 does not exist (for example, if the work 16 does not exist before falling), it is determined by the second control means (not shown) that there is an abnormality, and the press forming machine is stopped. Also, the work 16 pushed out by the feeder 14 is detected, but when the optical sensor 22 detects the work 16 at a predetermined position (for example, the same position as the above-mentioned predetermined position of feeding) when the feeder 14 is pulled down (the feeder 14 moves backward). Sometimes, when the work 16 is pulled back, the second control means determines that there is an abnormality and stops the press forming machine. When the work 16 is detected when the feeder 14 extrudes, and when the work 16 is not detected when the feeder 14 is pulled down, the second control means determines that the work 16 is normal, and the press molding machine is operated.

In the molding method using the press molding apparatus according to the embodiment, the work 16 may not be stuck on the upper mold 11 depending on the shape of the work 16. In this case, confirmation by the light emitting sensor 21a and the light receiving sensor 21b can be omitted. Further, depending on the shape of the work 16, the work 16 may not be pulled back to the feeder 14, and in this case, the confirmation by the optical sensor 22 can be omitted. In addition, the present invention can be applied to a case where a plate-shaped raw material is punched and pressed instead of the powder raw material 15 as a press forming method according to another embodiment. Further, the raw material is not limited to ceramics, but may be metal, resin, or the like. Further, when a plurality of works 16 are formed by one press die, it can be coped with by attaching a plurality of light emitting / receiving sensors and optical sensors.

[0020]

According to the first aspect of the present invention, in the press forming method, the light emitting / receiving sensor, which is linked to the movement of the upper die of the press forming machine, is moved by the thickness of the work provided below the upper die at the upper limit position of the movement. It is installed facing so that it can project and receive light in the horizontal direction through a substantial lower space, and if the light sensor cannot receive the light from the light sensor, it is judged that the work is attached to the upper mold If it is abnormal, stop the press molding machine, and if light can be received, judge that the work is not attached to the upper mold and make it normal, and operate the press molding machine, so the work is stuck on the press mold and Also, the press molding machine can be stopped reliably. Therefore, it is possible to prevent the mold from being damaged by double hitting of the work. Also,
The cleaning of the mold may be performed when the press molding machine is stopped, and the production efficiency can be increased. In the press molding method according to claim 2, an optical sensor that emits light in association with the movement of the feeder of the press molding machine is installed so as to be able to emit light from above while the work is being sent out and pulled down by the feeder. The press molding machine is started and stopped by detecting the existence of the work at the specified position, and the work that has been lifted by the upper mold falls before reaching the upper limit of the movement of the upper mold. Even if there is no work to be pushed by the feeder and the work is stuck to the feeder and returned into the press die, the press molding machine can be stopped reliably. Therefore, it is possible to prevent the mold from being damaged by double hitting of the work. Further, replacement of the sponge and the like of the feeder may be performed when the press molding machine is stopped, and the production efficiency can be increased. In the press molding method according to the third aspect, a light emitting sensor and a light receiving sensor that emit and receive light in association with the movement of the upper die of the press molding machine, and a light that emits light in conjunction with the movement of a feeder of the press molding machine. With the sensor, the presence or absence of the work is detected and judged and the press molding machine is started and stopped, so the work is stuck on the upper mold, and the work caught on the upper mold falls on the way. Even if the work is pulled back to the tip of the feeder, it can be detected by the light emitting / receiving sensor and the optical sensor, so that the press molding machine can be stopped reliably.

In the press forming apparatus according to the fourth aspect of the present invention, the press forming machine operates in conjunction with the movement of the upper die, and the lower part corresponding to the thickness of the work provided below the upper die at the upper limit position of the movement. The light-emitting sensor and light-receiving sensor, which are arranged opposite to each other so that light can be emitted and received in the horizontal direction through the space, and the presence or absence of the work is checked by the light-emitting and light-receiving sensors, and the press molding machine is stopped after judging. Alternatively, since there is provided an operating control means, it is possible to provide a molding apparatus capable of preventing damage to a mold due to double hitting of a workpiece. 6. The press forming apparatus according to claim 5, wherein the optical sensor operates in conjunction with the movement of the feeder of the press forming machine, and projects light from above to a predetermined position while the workpiece is being sent out and pulled down by the feeder, and an optical sensor. Has a control means for checking the presence or absence of a workpiece at a predetermined position, stopping and operating the press molding machine by making a judgment,
It is possible to provide a molding apparatus capable of preventing damage to a mold due to double hitting of a workpiece. In the press forming apparatus according to the sixth aspect, the lower space portion corresponding to the thickness of the work provided below the upper mold at the upper limit position of movement is operated in conjunction with the movement of the upper mold of the press molding machine. A light-emitting sensor and a light-receiving sensor, which are arranged to face each other so that light can be transmitted and received in the horizontal direction, and the presence or absence of a work is checked by the light-emitting and light-receiving sensor to determine whether or not the press molding machine is stopped or activated. An optical sensor that operates in conjunction with the movement of the feeder of the press forming machine, and projects light from above to a predetermined position while the workpiece is being sent out and pulled down by the feeder; Has the second control means for stopping and operating the press molding machine after confirming the presence or absence of the work at the predetermined position, so that the work is pulled up by the upper mold. Even if the workpiece that has been pulled up by the upper mold falls on the way, or if the workpiece gets stuck at the end of the feeder and returns, it can be detected by the light emitting / receiving sensor and optical sensor, so the press molding machine is stopped reliably. And a molding apparatus capable of performing the molding.

[Brief description of the drawings]

FIG. 1 is a schematic partial sectional side view for explaining a press molding method according to an embodiment of the present invention.

FIGS. 2A and 2B are perspective views each showing an upper mold portion of a press forming apparatus according to an embodiment of the present invention.

FIG. 3 is a perspective view showing a feeder portion of the press forming apparatus according to one embodiment of the present invention.

[Explanation of symbols]

11: Upper mold, 12: Lower mold, 13: Die, 14: Feeder, 14a: Injection port, 15: Powder raw material, 16: Work, 16a: Work position, 16b: Work position, 21
a: light emitting sensor, 21b: light receiving sensor, 22: light sensor

Claims (6)

[Claims] 1. A press forming method for confirming whether or not the work remains in a press die in a process of feeding the work from a press die of the press forming machine, wherein A light-emitting sensor and a light-receiving sensor that emit and receive light in conjunction with movement can be horizontally emitted and received through a lower space portion corresponding to the thickness of the work provided below the upper mold at the upper limit position of movement. So that they face each other,
If the light-receiving sensor cannot receive the light emitted from the light-emitting sensor, it is determined that the work is attached to the upper mold, an abnormality is determined, the press molding machine is stopped, and the light emitted from the light-emitting sensor is emitted. When the light receiving sensor is capable of receiving light, it is determined that the work does not adhere to the upper mold, the condition is determined to be normal, and the press forming machine is operated. 2. A press forming method for checking whether or not a work remains in a press die in a process of sending the work from a press die of the press forming machine, wherein the movement of a feeder of the press forming machine is controlled. An optical sensor that emits light in conjunction with
When the work is being sent out by the feeder and installed so that light can be projected from above at a predetermined position in the middle of pulling down the feeder, and the optical sensor cannot detect the work being sent out by the feeder at the predetermined position, or If the work is detected during the lowering of the feeder, it is determined that there is an abnormality, the press molding machine is stopped, and the optical sensor detects the work being sent out by the feeder at the predetermined position, and If the work is not detected while the feeder is being lowered, it is determined that the work is normal and the press forming machine is operated. 3. A press forming method for confirming whether or not the work remains in the press die in a process of sending the work from a press die of a press forming machine, wherein the upper die of the press forming machine is provided. A light-emitting sensor and a light-receiving sensor that emit and receive light in conjunction with movement can be horizontally emitted and received through a lower space portion corresponding to the thickness of the work provided below the upper mold at the upper limit position of movement. So that they face each other,
If the light-receiving sensor cannot receive the light emitted from the light-emitting sensor, it is determined that the work is attached to the upper mold, an abnormality is determined, the press molding machine is stopped, and the light emitted from the light-emitting sensor is emitted. If the light receiving sensor can receive light, it is determined that the work is not attached to the upper mold and it is normal, the press molding machine is operated, and further, in conjunction with the movement of the feeder of the press molding machine. An optical sensor for projecting light is installed so that light can be projected from above at a predetermined position in the course of sending out the work by the feeder and in the process of pulling down the feeder, and the optical sensor is being sent out by the feeder at the predetermined position. If the work cannot be detected, or if the work is detected while the feeder is being lowered, the press molding machine is determined to be abnormal and the press molding machine is stopped, and the optical sensor detects the work. Press forming characterized in that when the work being sent out by the feeder at a fixed position is detected, and when the work is not detected while the feeder is being lowered, the work is determined to be normal and the press forming machine is operated. Method. 4. A process in which a work is pressed by a press die of a press molding machine, the work is removed from the press die, and the work is sent out from the press die. A press-forming apparatus for confirming the presence or absence of a residual, which operates in conjunction with the movement of an upper die of the press-forming machine, and is equivalent to a thickness of the work provided at a lower portion of the upper die at a movement upper limit position. A light-emitting sensor and a light-receiving sensor that are arranged so as to be able to project and receive light in the horizontal direction through the lower space portion, and the work is placed on the upper mold when the light-receiving sensor cannot receive light emitted from the light-emitting sensor. The press molding machine is stopped when it is determined that the workpiece is attached, and when the light receiving sensor receives the light emitted from the light emitting sensor, it is determined that the work is not attached to the upper mold, and the press is pressed. Make molding machine And pressurizing control means. 5. A process in which a work is pressed by a press die of a press molding machine, the work is taken out of the press die, and the work is sent out from the press die. A press forming apparatus for checking the presence or absence of a residual material. The press forming apparatus operates in conjunction with the movement of a feeder of the press forming machine, and is disposed from above at a predetermined position while the work is being sent out by the feeder and when the feeder is being pulled down. An optical sensor that emits light, and when the optical sensor cannot detect the work that is being sent out by the feeder at the predetermined position, or when the work is detected while the feeder is being pulled down, it is determined that the work is abnormal and the press molding is performed. When the optical sensor detects the work being sent out by the feeder at the predetermined position, and when the feeder is lowered. And control means for operating the press forming machine when the work is not detected in the middle of the process and determining that the work is normal. 6. A process in which a work is pressed by a press die of a press molding machine, the work is taken out of the press die, and the work is sent out from the press die. A press-forming apparatus for confirming the presence or absence of a residual, which operates in conjunction with the movement of an upper die of the press-forming machine, and is equivalent to a thickness of the work provided at a lower portion of the upper die at a movement upper limit position. A light-emitting sensor and a light-receiving sensor that are arranged so as to be able to project and receive light in the horizontal direction through the lower space portion, and the work is placed on the upper mold when the light-receiving sensor cannot receive light emitted from the light-emitting sensor. The press molding machine is stopped when it is determined that the workpiece is attached, and when the light receiving sensor receives the light emitted from the light emitting sensor, it is determined that the work is not attached to the upper mold, and the press is pressed. Make molding machine A first control unit that moves and a light that operates in conjunction with the movement of a feeder of the press molding machine and emits light from above to a predetermined position while the workpiece is being sent out by the feeder and the feeder is being pulled down. When the sensor and the optical sensor cannot detect the work being sent out by the feeder at the predetermined position, or when the work is detected while the feeder is being pulled down, it is determined that there is an abnormality and the press molding machine is stopped. Then, if the optical sensor detects the work in the middle of being sent out by the feeder at the predetermined position, and if the work is not detected while the feeder is being lowered, it is determined that the work is normal and the press molding machine is operated. Second control means;
A press molding apparatus characterized by having: