JP2007290313A - Device and method for straightening distortion of molded plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the flatness of a molded synthetic resin flat plate to not higher than 0.5. <P>SOLUTION: A thin and flat product 1 having an area of 1,000 mm<SP>2</SP>or more is injection molded with an injection mold 70. The flat product 1 molded with the injection mold 70 is taken therefrom, and is positioned to fill the distortion straightening mold 40 consisting of a movable distortion straightening mold 10 and a fixed distortion straightening mold 20, using the outer periphery or the corner holes 2a, 2b, 2c, 2d of the flat product 1. A load in the direction reverse to the mold distortion direction is applied to a partial area or the whole area of the flat product, corresponding to the molding distortion of the flat product 1 molded with the injection mold 70. The flat product 1 molded with the injection mold 70 is pressurized and straightened with the distortion straightening mold 40 at a product temperature lower than the molding temperature, cooled at the cooling speed and taken out of the mold at a take-out temperature of a distortion straightened product, thereby executing the straightening of the distortion of the flat plate. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a molded flat plate distortion correcting device and a molded flat plate distortion correcting method capable of reducing the flatness of a molded synthetic resin flat plate having an area of 1000 mm ² or more.

  Generally, as this type of flat plate distortion correcting device, Patent Document 1 in which a synthetic resin flat plate is used as a fuel cell separator is known. This technique is a method for manufacturing a fuel cell separator in which a material obtained by kneading carbon and a thermosetting resin is compression-molded into a predetermined shape by an injection molding movable mold and an injection molding fixed mold, and is molded by heating to a curing temperature. When the separator taken out from the mold after heating to the curing temperature is radiated, the heating temperature of one of the injection molding movable mold and the injection molding fixed mold corresponding to the surface with good heat dissipation is set to the other. A technique for setting the temperature higher than the heating temperature is disclosed.

  Patent Document 2 discloses a device for correcting a synthetic resin container for correcting the bottom wall of an upward-opening type thermoplastic synthetic resin container having a deformed bottom wall. That is, it comprises a heating section, a cooling section arranged side by side, and driving means arranged below both sections, and the heating section can be set to a predetermined high temperature range and is in an inverted state. The cooling section having a movable heat plate capable of placing the inner surface of the bottom wall of the synthetic resin container, and a fixed heat plate that can be set in a predetermined high temperature region and is fixed to face the upper side of the movable heat plate. Is a cooling movable plate on which the inner surface of the bottom wall of the synthetic resin container in an inverted state can be placed, and a cooling means that can be set in a predetermined low temperature region and is fixed above the cooling movable plate. And the drive means operates the elevating mechanism that supports the movable heat plate and the cooling movable plate to be raised and lowered, and operates the elevating mechanism to raise and lower the movable heat plate and the cooling movable plate, Placed on them Wherein at the external surface of the bottom wall of the synthetic resin container having a single fluid pressure cylinder contacting and separating with respect to the stationary heating plate and the cooling means.

And in patent document 3, after shaping | molding a synthetic resin molding with an injection molding machine, the shaping | molding method of the synthetic resin molding which cools while correcting the synthetic resin molding taken out from the injection molding machine with a correction jig Is disclosed.
JP-A-2005-174710 Japanese Patent Laid-Open No. 08-336908 JP-A-11-129288

Regarding the technique of Patent Document 1, when the separator taken out from the mold is radiated, the heating temperature of either the injection-molding movable mold or the injection-molding fixed mold corresponding to the surface with good heat dissipation is set to the other. Although the temperature is set higher than the heating temperature, this technical idea cannot be adopted when the surface areas on both sides are uniform, such as a synthetic resin flat plate.
Moreover, about the technique of the said patent document 2, a movable heat | fever platen is raised, the bottom wall of the synthetic resin container mounted in it is pinched | interposed into a pinching state by pinching | interposing a movable heat | fever platen and a fixed heat | fever plate from both inside and outside. It heats, raises the movable plate for cooling, and cools the bottom wall of the container placed on it from both the inner and outer surfaces with the movable plate and the cooling means under a pinched state. Although it corrects by removing the deformation, it is remolded and cannot be used for processing to reduce the flatness of the molded synthetic resin flat plate.
And about the technique of the said patent document 3, after shaping | molding a synthetic resin molding with an injection molding machine, it cools, correcting the synthetic resin molding taken out from the injection molding machine with a correction jig. According to the confirmation experiment by the inventors, even when trying to reduce the flatness of the molded synthetic resin flat plate, the flatness is 0.5 or less in a thin and large flat plate product such as a fuel cell separator. It was difficult to do.
In addition, the inventors conducted a confirmation experiment on a method of performing annealing for 2 hours by applying a constant load at a high temperature as the most generally considered correction method, but the flatness was reduced to 0.5 or less. The effect to the extent that it was made was not obtained.

  Accordingly, the present invention has been made to solve such problems, and it is an object of the present invention to provide a molded flat plate distortion correcting device and a distortion correcting method thereof that can reduce the flatness of a molded synthetic resin flat plate to 0.5 or less. It is.

According to a first aspect of the present invention, there is provided an injection mold for performing injection molding of a flat product having a thickness of 1000 mm ² or more, for example, a flat product such as a separator for a fuel cell, and the injection mold. The flat plate product molded by the mold is taken out from the injection mold and loaded, and the direction of the molding strain is partially or entirely corresponding to the molding strain of the flat plate product molded by the injection mold. Applying a load in the opposite direction to the plate, the flat plate distortion is determined by the straightening pressure and cooling rate, and the straightening product take-off temperature at a product temperature lower than the molding temperature of the flat product molded by the injection mold. It comprises a distortion correction mold for correcting the above.
Here, the injection mold may be a mold that performs injection molding of a plate material such as a flat plate fuel cell separator having a thin wall thickness of about 3 mm or less and an area of about 1000 mm ² or more. Of course, the flat plate includes a surface irregularity pattern, a texture pattern, and a crosspiece shape that are regarded as a flat plate like a plate material such as a separator for a fuel cell, and is usually based on the outer surface. When doing so, the inside can be used as a reference.
Further, the positioning and loading of the flat plate-shaped product specifies the strain reference position, so that it is sufficient if the specific position can be determined two-dimensionally using the outer periphery or the corner hole.
The load applied to the partial area or the entire area corresponding to the molding strain in the direction opposite to the direction of the molding strain is a load applied to the corresponding part depending on the magnitude of the strain. If it sees partially, it will become the whole, but what is necessary is just to apply the load according to it with respect to a large distortion part.
Furthermore, the above-mentioned distortion correction mold corrects plate distortion at a product temperature lower than the molding temperature of a flat product molded by an injection mold, by pressure and pressure for correction and cooling, and the temperature at which the correction product is taken out. The time for performing distortion correction is set according to the pressure and cooling rate for correction and pressurization, and the temperature at which the correction product is taken out.

  The distortion correction mold of the molded flat plate distortion correction apparatus according to claim 2 is located below the injection mold. Here, the vertical relationship between the distortion correction mold and the injection mold is based on energy consumption with respect to the flow of a flat product, and does not deny implementation other than the positional relationship.

  According to a third aspect of the present invention, there is provided a molded flat plate distortion correcting apparatus for performing injection molding and distortion correction with the same stroke by attaching an injection mold and a distortion correcting mold to the same molding machine.

The method for correcting flat plate distortion according to claim 4 includes an injection molding step of performing injection molding of a thin plate-shaped product having an area of 1000 mm ² or more by an injection mold comprising an injection molding movable mold and an injection molding fixed mold. The flat plate product injection-molded by the injection molding step is taken out from the injection mold and is loaded with positioning, and in accordance with the molding distortion of the flat plate product molded by the injection mold, the partial area or the total area Applying a load in the direction opposite to the direction of the molding strain, the pressure and cooling rate for correcting and pressing at a product temperature lower than the temperature at which the flat product molded by the injection mold is molded, According to the take-out temperature, there is provided a distortion correction process for correcting the plate distortion within the time required for the injection molding process.
Here, the injection mold comprising the injection mold movable mold and the injection mold fixed mold for performing the injection molding is a plate material such as a flat plate fuel cell separator having a thin wall thickness of about 3 mm or less and an area of about 100 cm ² or more. Any mold that performs injection molding may be used. Of course, the flat plate includes a surface irregularity pattern, a texture pattern, and a crosspiece shape that are regarded as a flat plate like a plate material such as a separator for a fuel cell, and is usually based on the outer surface. When doing so, the inside can be used as a reference.
Further, the positioning and loading of the flat plate-shaped product specifies the strain reference position, so that it is sufficient if the specific position can be determined two-dimensionally using the outer periphery or the corner hole.
Then, the pressure applied to the partial area or the entire area corresponding to the molding strain in the direction opposite to the direction of the molding strain is a load applied to the corresponding part depending on the magnitude of the strain. Therefore, if it sees partially, it will become the whole, but what is necessary is just to apply the pressurization according to it to the part with big distortion.
Furthermore, the above-mentioned distortion correction mold corrects plate distortion at a product temperature lower than the molding temperature of a flat product molded by an injection mold, by pressure and pressure for correction and cooling, and the temperature at which the correction product is taken out. The time for correcting the distortion is set according to the pressure and cooling rate for correction and pressurization, and the temperature at which the correction product is taken out, and is set within the injection molding time in terms of work efficiency.

  The said distortion correction process of the shaping | molding flat plate distortion correction method concerning Claim 5 is performed in the downward position of the said injection molding process. Here, the vertical relationship between the distortion correction mold and the injection mold is based on energy consumption with respect to the flow of a flat product, and does not deny implementation other than the positional relationship.

  According to a sixth aspect of the present invention, there is provided a molding flat plate distortion correcting method in which injection molding and distortion correction are performed in the same stroke by attaching an injection mold and a distortion correcting mold to the same molding machine.

The molded flat plate distortion correcting device according to claim 1 performs injection molding of a thin plate-shaped product having an area of 1000 mm ² or more with an injection mold, and the flat plate product molded with the injection mold with the distortion correcting die. Corresponding to the molding distortion of a flat product molded with the injection mold, taken out from the injection mold, positioned and loaded into the distortion correction mold, the direction of the molding distortion is opposite to the partial area or the entire area. Applying a load in the direction of the plate, correct the flat plate distortion at a product temperature lower than the temperature at which the flat plate product molded with the injection mold is molded, by the pressure and cooling rate for correction and pressure, and the temperature at which the correction product is taken out. Is what you do.
In general, a flat product requiring correction is warped and deformed due to molding distortion, and is largely twisted, which is determined by an injection molding machine and a mold. When the same mold and the same injection molding machine are used, almost the same molding distortion appears. Applying a load in a direction opposite to the direction of the molding strain to a partial area or the entire area according to the molding strain so as to impart a strain in the direction opposite to the strain direction to the molding strain, The flat plate distortion is corrected at a product temperature lower than the temperature at which the flat plate product molded by the injection mold is molded, and the pressure and cooling rate for correction and pressurization are specified conditions. The correction product is taken out at the temperature. Therefore, the flatness can be made 0.3 or less.

  Since the distortion correction mold of the molded flat plate distortion correction apparatus of claim 2 is located below the injection mold, in addition to the effect of claim 1, by opening the injection mold, Since the flat product molded by the injection mold moves downward by the action of gravity, distortion correction can be performed immediately after the injection molding. In addition, the conveyance energy can be minimized.

  The molded flat plate distortion correcting device according to claim 3 performs injection molding and distortion correction with the same stroke by attaching the injection mold and the distortion correcting die to the same molding machine. Injection molding and distortion correction can be performed at the timing of molding, and it is not necessary to prepare a dedicated molding machine for injection molding and distortion correction, and a flat product that has been corrected at the timing of injection molding can be molded.

According to a fourth aspect of the present invention, in the injection molding step, a thin plate-shaped product having an area of 1000 mm ² or more is injection-molded by an injection mold composed of an injection molding movable mold and an injection molding fixed mold. Further, the flat plate product injection-molded by the injection molding step is taken out from the injection mold, the flat plate product is positioned and loaded by the distortion correction step, and the flat plate product molded by the injection mold is molded. In response to the above, by applying a load in a direction opposite to the direction of the molding strain to the partial area or the entire area, the product temperature is lower than the temperature at which the flat product molded by the injection mold is molded. The flat plate distortion is corrected within the time required for the injection molding process according to the pressure and cooling rate for correction and pressure, and the temperature at which the correction product is taken out.
In general, a flat product requiring correction is warped and deformed due to molding distortion, and is largely twisted, which is determined by an injection molding machine and a mold. When the same mold and the same injection molding machine are used, almost the same molding distortion appears. Applying a load in a direction opposite to the direction of the molding strain to a partial area or the entire area according to the molding strain so as to impart a strain in the direction opposite to the strain direction to the molding strain, The flat plate distortion is corrected at a product temperature lower than the temperature at which the flat plate product molded by the injection mold is molded, and the pressure and cooling rate for correction and pressurization are specified conditions. The correction product is taken out at the temperature. Therefore, the flatness can be made 0.3 or less.

  Since the distortion correction step of the molded flat plate distortion correction method of claim 5 is performed at a position below the injection molding step, in addition to the effect of claim 4, the injection mold is opened by opening the injection mold. Since the flat product molded by the mold moves downward by the action of gravity, distortion correction can be performed immediately after injection molding. In addition, the conveyance energy can be minimized.

  Since the molding flat plate distortion correction method according to claim 6 performs injection molding and distortion correction with the same stroke by attaching the injection mold and the distortion correction mold to the same molding machine, the effect of claim 3 or claim 4 is achieved. In addition, injection molding and distortion correction can be performed at the timing of injection molding, and there is no need to prepare a dedicated molding machine for injection molding and distortion correction.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a flat product molded with an injection mold using the molded flat plate distortion correcting apparatus according to the first embodiment of the present invention, and FIG. 2 is an injection molding performed with the molded flat plate distortion correcting apparatus according to the first embodiment of the present invention. It is a top view (a) and a side view (b) of an explanatory view of distortion correction. FIG. 3 is an explanatory view showing the positions of injection molding and distortion correction by the molded flat plate distortion correcting apparatus according to Embodiment 1 of the present invention, and (a) is an explanatory view for performing distortion correction at the lower position after injection molding. ) Is an explanatory diagram for performing distortion correction in a lateral position after injection molding. FIG. 4 is an explanatory view before the distortion correction processing by the distortion correction mold by the molded flat plate distortion correcting apparatus according to the first embodiment of the present invention, and FIG. 5 is a pressing side protrusion by the molded flat plate distortion correcting apparatus according to the first embodiment of the present invention. 4 is an explanatory diagram of setting of the receiving projection and corresponds to a cross-sectional view taken along the cutting line AA in FIG. FIG. 6 is an explanatory view after processing of the distortion correction mold by the molded flat plate distortion correction apparatus according to the first embodiment of the present invention.

In FIG. 1, a flat product 1 is a fuel cell separator having a thin wall and an area of about 100 × 200 mm ² or more, and an injection mold 70 comprising an injection molding movable mold 52 and an injection molding fixed mold 62 shown in FIG. It is formed by.
The flat product 1 is formed with corner holes 2a, 2b, 2c, 2d for positioning at the four corners. The corner holes 2a, 2b, 2c, and 2d at the four corners may be omitted, and two or more sides sandwiching the right angle of the flat plate-like product 1 may be positioned based on the mold loading reference. That is, the positioning and loading using the outer periphery of the flat product 1 or the corner holes 2a, 2b, 2c, and 2d specifies the reference position of the distortion. Any means that can be specified two-dimensionally may be used.

In FIG. 2, an injection molding machine movable part 50 and an injection molding machine fixing part 60 are a movable part and a fixed part of a known injection molding machine. A mold mounting plate 51 and a mold mounting plate 61 are respectively attached to the injection molding machine movable portion 50 and the injection molding machine fixing portion 60, and an injection molding movable die 52 and an injection molding fixed die 62 are attached thereto. ing. An injection mold 70 composed of an injection mold movable mold 52 and an injection mold fixed mold 62 is used to mold a flat product 1 such as a fuel cell separator having a thin wall and an area of about 100 × 200 mm ² or more.

The injection molding machine movable unit 50 and the injection molding machine fixing unit 60 are provided with an arm 53 and an arm 63, respectively. The arm 53 and the arm 63 are respectively connected to the correction movable mold 10 via the holder 15 or the holder 25. The mold substrate 11 or the mold substrate 21 of the correction fixing mold 20 is attached. Therefore, simultaneously with the injection molding machine movable part 50, the mold substrate 11 of the correction movable mold 10 operates.
The mold loading reference line 30 has two or more sides sandwiching the corner holes 2a, 2b, 2c, 2d or the right angle of the flat product 1 at the four corners of the flat product 1 as the mold loading reference. The positioning is performed, and it is not always necessary to set the reference position at the lower position.

In the molded flat plate distortion correcting device of the present embodiment, as shown in FIG. 3A, the flat product 1 is formed by an injection molding process at the upper part of the injection molding machine movable unit 50 and the injection molding machine fixing unit 60. In the lower part, the correction process is performed in which the mold substrate 11 of the correction movable mold 10 operates. A cooling pipe 13 or a cooling pipe 23 is provided on the mold substrate 11 of the correction movable mold 10 and the mold substrate 21 of the correction fixed mold 20, and temperature control of the correction movable mold 10 and the correction fixed mold 20 is performed. It is like that.
When the flat product 1 obtained by the injection molding process is dropped by opening the injection molding movable mold 52 and the injection molding fixed mold 62 and positioned by a guide (not shown) of the mold loading reference line 30, Therefore, the correction process is performed by the correction movable mold 10 and the correction fixed mold 20.

  In FIG. 3A, the flat plate-like product 1 obtained by the injection molding process has been described in the process of dropping by opening the injection molding movable mold 52 and the injection molding fixed mold 62, but the present invention is implemented. In this case, the flat product 1 obtained by the injection molding process of the injection molding machine movable unit 50 and the injection molding machine fixing unit 60 is moved in the lateral direction by a hydraulic cylinder, an air cylinder, etc. It is also possible to perform the process shown in FIG. 3B in which a correction process for operating the mold substrate 11 is performed. In any case, since the flat product 1 obtained by the injection molding process has almost the same strain form, if the positioning of the flat product 1 is accurately performed, the injection molding process and the distortion correction process are performed. The positional relationship is not questioned.

In the correction movable mold 10 in FIG. 4, a plurality of correction protrusions 12 (12 a,... 12 i) are disposed on a mold substrate 11. As shown in the conceptual diagram of FIG. 5 cut along the cutting line AA in FIG. 4, the position of the correction protrusion 12a is the virtual reference line X- in FIG. The amount of displacement ha of the upper surface of the flat product 1 displaced upward is measured with respect to X, the amount of displacement ha displaced upward measured is multiplied by N, and the mold of the correction movable mold 10 The height H12a of the correction protrusion 12a from the substrate 11 is
The height H12a of the correction protrusion 12a = correction movable distance hus + displacement amount ha · N
And Note that N times the displacement ha is usually a value from 0.5 to 1.3 as N, and this N is a value depending on the temperature and cooling rate when the flat product 1 is corrected. It is.
The correction movable reference surface is the surface of the mold substrate 11, and has a correction movable distance hus between the flat plate-like product 1 having an ideal plane. The correction fixed mold reference plane is the surface of the mold substrate 21 and has a correction fixed mold distance hds between the flat plate-like product 1 having an ideal plane. The correction protrusions 12 (12a,... 12i) protrude from the surface of the mold substrate 11. The correction protrusions 22 (22a,... 22i) protrude from the surface of the mold substrate 21. These may screw the correction protrusions 12 (12a,... 12i) or the correction protrusions 22 (22a,... 22i) to the mold substrate 11 or the mold substrate 21.

In the correction fixing mold 20 in FIG. 4, a plurality of correction protrusions 22 (22 a,... 22 i) are disposed on a mold substrate 21. Since the flat product 1 is displaced upward with respect to the virtual reference line XX in FIG. 5 on the premise that the flat surface of the flat product 1 is a uniform flat surface, the correction product 22a has a flat product. Ignoring the wall thickness of 1
The height H22a of the correction protrusion 22a = the correction fixed mold distance hds−the height H12a of the correction protrusion 12a.
Set to the height of. In reality, the thickness of the flat product 1 is subtracted. This is the height H22a of the correction protrusion 22a from the mold substrate 21 of the correction fixing mold 20. Naturally, the height H22a of the correction protrusion 22a is lower than the position of the virtual reference line XX.

The position of the correction protrusion 12b of the correction movable mold 10 in FIG. 5 is displaced downward with respect to the virtual reference line XX in FIG. Here, the displacement amount hb of the lower surface of the flat product 1 is measured, and the height H12b of the correction protrusion 12b from the mold substrate 11 of the correction movable mold 10 is defined as the correction movable mold distance hus−the displacement amount hb · N. . That is,
The height H12b of the correction protrusion 12b = correction movable distance hus−displacement amount hb · N
It becomes.

Further, the correction protrusions 22b of the correction fixing mold 20 in FIG. 4 are in relation to the virtual reference line XX of the flat product 1 as shown in FIG. 5 cut along the cutting line AA in FIG. When the height H22b of the correction protrusion 22b is obtained from the displacement amount -hb of the flat product 1 displaced downward,
The height H22b of the correction protrusion 22b = the correction fixed mold distance hds + the height H12b of the correction protrusion 12b
It becomes. In reality, the thickness of the flat product 1 is subtracted.

  Similarly, regarding the positions of the correction protrusions 12c,..., 12i, the displacement hc,..., Hi of the upper surface of the flat product 1 with respect to the virtual reference line XX of the flat product 1 Is multiplied by N and added to the correction movable mold distance hus from the mold substrate 11 of the correction movable mold 10 to obtain the heights H12c,..., H12i of the correction protrusions 12c,. 12c,..., 12i, which is obtained by subtracting N times the displacement amount hc,..., Hi from the correction fixed mold distance hds, is the height H22c of the correction protrusions 22c,.・ H22i. In reality, the thickness of the flat product 1 is subtracted.

Between the correction protrusions 12 (12a,... 12i) of the correction movable mold 10 thus configured and the correction protrusions 22 (22a,... 22i) of the correction fixed mold 20, formed by an injection mold. The flat product 1 is positioned using the corner holes 2a, 2b, 2c, 2d provided at the four corners or two or more sides thereof. In this state, the flat product 1 is at a temperature lower than the injection molding temperature.
If the correction movable mold 10 and the correction fixed mold 20 are relatively moved in this state, the position of the flat product 1 where the distortion is large is the correction protrusions 12a, ..., 12i or the correction protrusions 22a, ..., 22i. Pressurized with. At this time, since the distortion of the flat product 1 is at a temperature lower than the injection molding temperature, only the portion pressed by the correction protrusions 12a, ..., 12i or the correction protrusions 22a, ..., 22i. It does not become a deformation, and it deforms over a wide range because the temperature of the flat product 1 is low. And the shape is fixed by cooling.

  At this time, the correction protrusions 12a,..., 12i of the correction movable mold 10 and the correction protrusions 22a,. A variable that is pressed downward beyond the flat surface of the flat product 1 and has convex strains below each other is a flat plate that makes the variable based on the convex strain from below the ideal of the flat product 1. It pushes upward beyond the surface and corrects it, and when the correction is performed beyond the ideal flat surface of the flat product 1, the distortion of the flat product 1 does not return. Intrinsic distortion can be removed and corrected.

The correction protrusions 12a,..., 12i of the correction movable mold 10 and the correction protrusions 22a,..., 22i of the correction fixed mold 20 are partially convex upward or downward. The area is pressed in the direction opposite to the direction of the molding strain, but when the present invention is carried out, the flat product 1 may be pressed by the surface.
That is, a metal film is formed on the front and back surfaces of the flat product 1 by vapor deposition or sputtering, and the distortion correcting mold 40 including the correcting movable mold 10 and the correcting fixed mold 20 is formed by a die-sinking electric discharge machine using the metal film. The mold formed and formed on the surface of the flat product 1 is used as a correction fixed mold 20 for correcting the back surface, and conversely, the mold formed on the back surface of the flat product 1 is used for correcting the surface. 10 can be used. In this case, logically, correction can be performed with high accuracy, but correction is performed at a product temperature lower than the temperature at which the flat product 1 molded by the injection mold 70 is molded. , Couldn't make that remarkable achievement.

The flat product 1 molded by the injection mold 70 in the present embodiment is taken out from the injection mold 70 and positioned using the outer periphery of the flat product 1 or the corner holes 2a, 2b, 2c, 2d. Then, it is loaded into a strain correction mold 40 composed of the correction movable mold 10 and the correction fixed mold 20 and molded into a partial area or the entire area corresponding to the molding distortion of the flat product 1 molded by the injection mold 70. Since the pressure is applied in the direction opposite to the direction of strain and the flat product 1 molded by the injection mold 70 is corrected at a product temperature lower than the molding temperature, partial strain can be introduced. , 12i of the correction movable mold 10 and correction of a wider range than the end areas of the correction protrusions 22a,..., 22i of the correction fixed mold 20 can be performed. .
Further, since the correction of the plate distortion changes depending on the pressure applied by the strain correction mold 40 including the correction movable mold 10 and the correction fixed mold 20, the cooling rate, and the temperature at which the correction product is taken out, the thickness and area of the flat product 1 are changed. Depending on the surface area, they can be set to conditions for optimal correction.

As described above, the molded flat plate distortion correcting device of the present embodiment has a thin injection molding movable mold 52 for performing injection molding of a flat product 1 such as a fuel cell separator having an area of 1000 mm ² or more, and injection molding. The injection mold 70 composed of the fixed mold 62 and the flat product 1 molded by the injection mold 70 are taken out from the injection mold 70, and the outer periphery or corner holes 2a, 2b, 2c, 2d of the flat product 1 are formed. Corresponding to the molding distortion of the flat plate-like product 1 that has been positioned, loaded, and molded by the injection mold 70, a partial area or the entire area is pressurized in a direction opposite to the molding distortion direction. The straightening movable mold 10 for correcting the flat plate distortion at a product temperature lower than the molding temperature of the flat product 1 molded by the injection mold 70, the pressure and cooling rate for straightening and pressurization, and the takeout temperature of the straightening product. And straightening Those having a straightening die 40 consisting of the mold 20.

Therefore, the thin plate-shaped product 1 having an area of 1000 mm ² or more is injection-molded by the injection mold 70, and the flat product 1 molded by the injection mold 70 with the distortion correcting mold 40 is removed from the injection mold 70. Take out, position and load the distortion correction mold 40 including the correction movable mold 10 and the correction fixed mold 20 using the outer periphery of the flat product 1 or the corner holes 2 a, 2 b, 2 c, 2 d, and mold with the injection mold 70. Corresponding to the molding distortion of the flat plate-like product 1, the flat plate-like product 1 molded by the injection mold 70 is pressed to a partial area or the entire area in a direction opposite to the direction of the molding distortion. Flat plate distortion is corrected at a product temperature lower than the molding temperature by the pressure and cooling rate for correction and pressure, and the temperature at which the correction product is taken out.

In general, the flat product 1 requiring correction is warped and deformed due to molding distortion, and is largely twisted, which is determined by an injection molding machine and a mold. When the same mold and the same injection molding machine are used, almost the same molding distortion appears. Applying a load in a direction opposite to the direction of the molding strain to a partial area or the entire area according to the molding strain so as to impart a strain in the direction opposite to the strain direction to the molding strain, The flat plate distortion is corrected at a product temperature lower than the molding temperature of the flat product 1 molded by the injection mold and the pressure and cooling rate for correction and pressurization are specified conditions. The corrective product is taken out at a temperature of. Therefore, according to the experiments of the inventors, and the flatness of synthetic resin flat plate of 50,000 mm ² or less of the area from the molded 1000 mm ² or more areas can be 0.3 or less. Further, the plate thickness was as thin as about 3 mm or less, and the effect was confirmed.

  Furthermore, since the distortion correction mold 40 is positioned below the injection mold 70, the flat product 1 molded by the injection mold 70 is opened by the action of gravity by opening the injection mold 70. Therefore, distortion correction can be performed immediately after injection molding. In addition, the conveyance energy can be minimized.

Further, the operation of the molded flat plate distortion correcting device of the present embodiment can be regarded as a molded flat plate distortion correcting method.
That is, injection molding of a flat product 1 having a thickness of 1000 mm ² or more, such as a fuel cell separator, is performed by an injection mold 70 including an injection mold movable mold 52 and an injection mold fixed mold 62 in an injection molding process. In addition, the flat product 1 injection-molded by the injection molding process is taken out from the injection mold 70, and the outer periphery of the flat product 1 or the corner holes 2a, 2b, 2c, 2d is used in the distortion correction process. Corresponding to the molding strain of the flat product 1 that is positioned and loaded and molded by the injection mold 70, a partial area or the entire area is applied with a pressing force in a direction opposite to the molding strain direction, and injection is performed. The flat plate 1 is molded within the time required for the injection molding process at a product temperature lower than the temperature at which the flat plate-shaped product 1 molded with the molding die 70 is molded, depending on the pressure and cooling rate for correction and the take-out temperature of the correction product. Since it is intended to perform the correction, it is possible to the configuration and the invention of molding flat straightening methods.

  According to this method of correcting flat plate distortion, in general, a flat product 1 that requires correction is warped and deformed due to forming distortion, and is largely accompanied by twisting, which is determined by an injection molding machine and a mold. The When the same mold and the same injection molding machine are used, almost the same molding distortion appears. Applying a pressing force in a direction opposite to the direction of the molding strain to a partial area or the entire area according to the molding strain so as to give a strain in a direction opposite to the strain direction to the molding strain, Flat plate distortion is corrected at a product temperature lower than the temperature at which the flat plate-shaped product 1 molded by the injection mold 70 is molded, and the pressure and cooling rate for correction and pressurization are predetermined conditions, and the molding distortion does not change. The corrective product is taken out at a specific temperature. Therefore, the flatness can be made 0.3 or less.

  Further, as the distortion correction process, the flat product 1 molded by the injection mold 70 is moved downward by the action of gravity when the injection mold 70 is opened in the lower part of the injection molding process. Since it moves, distortion correction can be performed immediately after injection molding, and the conveyance energy can be minimized.

  The molded flat plate distortion correcting device and the molded flat plate distortion correcting method of the present embodiment are such that injection molding and distortion correction are performed in the same stroke by attaching the injection mold 70 and the distortion correcting mold 40 to the same molding machine. Injection molding and distortion correction can be performed at the timing of molding, and there is no need to prepare a dedicated molding machine for injection molding and distortion correction. Further, when performing continuous processing, there is no sense of incongruity that there are two steps. In particular, in order not to increase the cost due to distortion correction, the structure can be corrected by the same molding machine, and the correction is finished in the state of coming out of the molding machine. Specifically, injection molding is performed in an injection molding machine, and then a correction process is performed. From the injection molding process to the correction process, the product is moved using a dedicated conveying device, and when the correction process is performed, the next injection molding is performed.

  Although the molded flat plate distortion correcting apparatus and the molded flat plate distortion correcting method of the present embodiment have been described in the case of a fuel cell separator as a thin and large flat plate-like product 1, a material that can be realized as a fuel cell separator is conductive. Therefore, a normal thermoplastic resin such as PPS can be used. In addition, it is a thin molded product such as a fuel cell separator, and the flatness of the product function is O.D. 5 or less, and a structure in which an infinite number of ribs are arranged and pressure is applied in the direction opposite to the correction deformation direction at the position where correction deformation is desired even if the product shape cannot be set for the purpose of preventing deformation Since the product is set to the correction jig after the injection molding in a high state and cooled while being corrected, the product temperature when the distortion correction mold 40 is loaded, the temperature control of the distortion correction mold 40, and the product is taken out. The variation in correction conditions does not affect the variation in the amount of product deformation.

  In addition, although the shaping | molding flat plate distortion correction apparatus and shaping | molding flat plate distortion correction method of this Embodiment make injection molding and distortion correction respond | correspond 1: 1, when implementing this invention, distortion correction is carried out several times. It may be repeated.

FIG. 1 is a perspective view of a flat product molded by an injection mold using the molded flat plate distortion correcting apparatus according to Embodiment 1 of the present invention. FIG. 2 is a plan view (a) and a side view (b) of an explanatory view of injection molding and distortion correction by the molded flat plate distortion correcting apparatus according to Embodiment 1 of the present invention. FIG. 3 is an explanatory view showing the positions of injection molding and distortion correction by the molded flat plate distortion correcting apparatus according to Embodiment 1 of the present invention. FIG. 4 is an explanatory diagram before the distortion correction processing by the distortion correction mold by the molded flat plate distortion correction apparatus according to the first embodiment of the present invention. FIG. 5 is an explanatory diagram of the setting of the pressing side protrusion and the receiving side protrusion by the molded flat plate distortion correcting device according to the first embodiment of the present invention. FIG. 6 is an explanatory view after processing of the distortion correction mold by the molded flat plate distortion correction apparatus according to the first embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Flat product 2a, 2b, 2c, 2d Corner hole 10 Correction | amendment movable type | mold 11,21 Mold board | substrate 12 (12a, ..., 12i) Correction protrusion 20 Correction | amendment fixed type | mold 22 (22a, ..., 22i) Straightening projection 40 Straightening mold 52 Injection molding movable mold 62 Injection molding fixed mold 70 Injection molding mold

Claims (6)

An injection mold comprising an injection mold movable mold and an injection mold fixed mold for performing injection molding of a thin plate-shaped product having an area of 1000 mm ² or more;
The flat plate product molded by the injection mold is taken out from the injection mold, and is positioned and loaded, and the partial product or the total area corresponds to the molding distortion of the flat plate product molded by the injection mold. Pressing in the direction opposite to the direction of molding strain, and at a product temperature lower than the temperature at which the flat product molded by the injection mold is molded, depending on the pressure and cooling rate at which pressure is corrected and the temperature at which the corrected product is removed A molded flat plate distortion correcting apparatus, comprising a distortion correcting mold for correcting flat plate distortion.   2. The molded flat plate distortion correcting device according to claim 1, wherein the distortion correcting mold is positioned below the injection mold.   The molded flat plate distortion correction apparatus according to claim 1 or 2, wherein the molded flat plate distortion correcting apparatus performs injection molding and distortion correction with the same stroke by attaching an injection mold and a straightening mold to the same molding machine. Straightening device. An injection molding process for performing injection molding of a thin plate-shaped product having an area of 1000 mm ² or more by an injection mold comprising an injection molding movable mold and an injection molding fixed mold;
The flat plate product injection-molded by the injection molding step is taken out from the injection mold and is loaded with positioning, and in accordance with the molding distortion of the flat plate product molded by the injection mold, the partial area or the total area The pressure and cooling rate for correcting and pressing at a product temperature lower than the temperature at which the flat product molded by the injection mold is pressed by pressing in the direction opposite to the direction of the molding strain, taking out the corrected product And a distortion correcting step of correcting the plate distortion within a time required for the injection molding step depending on the temperature.   The method of claim 4, wherein the distortion correction step is performed at a position below the injection molding step. 5. The molded flat plate strain according to claim 3, wherein the molded flat plate strain correcting method performs injection molding and strain correction with the same stroke by attaching an injection mold and a straightening mold to the same molding machine. Correction method.

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