JP4409985B2 - Press molding apparatus, press molding method and molded product - Google Patents

Description

  The present invention comprises an upper die plate on which one or more upper dies are supported, and a lower die plate on which one or more lower dies corresponding to the upper dies are supported. The present invention relates to a press molding apparatus, a method, and a molded article that are pressed and molded using a mold composed of the upper mold and the lower mold.

Conventionally, an upper die plate on which one or more upper dies are supported, and a lower die plate on which one or more lower dies corresponding to the upper dies are supported, and a heat-softened material, Various press molding apparatuses and molding methods for optical elements that are pressed and molded using a mold composed of the upper mold and the lower mold have been proposed (see, for example, Patent Documents 1 to 6).
In the optical element molding apparatus and molding method, Patent Documents 2 and 3 disclose a technique in which an interval adjusting member is arranged, parallelism (interval) is controlled, and alignment is performed.
Further, Patent Documents 1, 4, 5 and 6 disclose a technique for disposing an interval adjusting member and controlling the thickness of a molded product (Patent Document 5 discloses an interval adjusting member having a linear expansion coefficient larger than that of a molded product. Deploy).
As a conventional technique for controlling the parallelism of the press molding apparatus, a distance block (also referred to as a distance adjusting member or a position adjusting block) is provided at a plurality of positions at the peripheral edge between the upper and lower molds so as not to contact the press material during processing. Are arranged respectively.
Conventionally, by adjusting the height of the distance block with a shim as necessary, the deviation in parallelism of the mold is corrected and fine adjustment of the parallelism of the press molding device is performed by hitting. Had gone.
In addition, as a conventional technique for controlling the thickness of a molded product, a distance adjusting member (having a larger linear expansion coefficient than the molded product) is disposed in the mold structure, and the upper mold and the lower mold are re-approached. There is also a technology to regulate this.
Japanese Patent No. 2593243 JP-A-6-227829 Japanese Patent Laid-Open No. 9-002825 Japanese Patent Laid-Open No. 9-077521 JP 2000-072456 A JP 2000-095530 A

In conventional press molding equipment, the parallelism and spacing accuracy of the upper and lower molds are not always satisfactory due to backlash caused by the processing accuracy of the sliding part, thermal strain caused by load, temperature difference, etc. It does not reach, and has a negative effect on the accuracy of the product.
In particular, if the press forming device is large, the processing error is large and the distortion of the sliding part also increases. To suppress this, a large measure is required and the device becomes expensive. However, as the wear of the sliding part progresses during long-term use, the play increases, and the reproducibility of the positional relationship accuracy between the two molds exceeds the practical allowable value, and the practical life of the press molding equipment is shortened. It is very uneconomical, such as shortening.
Here, in the case where the parallelism and interval between the upper die and the lower die are defined by the above-described distance block, the parallelism and interval between the upper die and the lower die are required to be measured by measuring the interval between the molds. Accordingly, it is possible to correct the parallelism of the mold with shims and finely adjust the press molding apparatus by hitting.
However, the adjustment amount at the time of the hitting operation becomes too large, and there is a problem that the press molding apparatus needs to be reattached or the quality of the product varies. Also, during molding, the interval can be defined but cannot be controlled.
In addition, a gap adjusting member (having a larger linear expansion coefficient than that of the molded product) is arranged in the mold structure to control the thickness of the molded product, and the interval can be defined during molding. However, since it cannot be controlled, it is necessary to change the material and thickness of the interval adjusting member every time the molding material and molding conditions change, which is very complicated.
Furthermore, adjusting the parallelism and spacing between the upper and lower molds using a conventional spacing adjustment member requires a complicated operation of measuring the spacing between the molds and sandwiching shims as necessary. However, there is a problem that it becomes necessary to reattach the press molding apparatus or the quality of the product varies.
An object of the present invention is to consider the above-mentioned situation, dispose a gap adjusting member at three or more locations not in contact with the press material in the mold structure, provide a temperature adjusting mechanism in the gap adjusting member, An object of the present invention is to provide a press molding apparatus, a molding method, and a molded product having a function of controlling the parallelism and interval between an upper die and a lower die by utilizing a dimensional change due to a temperature change.

In order to solve the above problems, the invention according to claim 1 is directed to an upper die plate on which one or more upper dies are supported and a lower die on which one or more lower dies corresponding to the upper dies are supported. In a press molding apparatus having a mold structure composed of a mold die plate and pressing the heat-softened press material using the upper mold and the lower mold, the press material in the mold structure does not come into contact A temperature adjusting mechanism that is arranged at three or more positions and that arranges a gap adjusting member between either the upper die plate or the upper die and either the lower die plate or the lower die, and causes a dimensional change of the gap adjusting member. Is provided on the interval adjusting member.
According to a second aspect of the present invention, in the press forming apparatus according to the first aspect, the dimensional change due to the temperature change of the gap adjusting member is a change in the height of the gap adjusting member utilizing expansion and contraction due to temperature. Features.
According to a third aspect of the present invention, in the press forming apparatus according to the first aspect, the dimensional change due to a temperature change of the gap adjusting member is a change in the height of the gap adjusting member utilizing an expansion difference due to a temperature distribution. It is characterized by.
According to a fourth aspect of the present invention, the dimensional change due to the temperature change of the gap adjusting member utilizes the change in the height of the gap adjusting member using expansion and contraction due to temperature and the expansion difference due to temperature distribution. The press forming apparatus according to claim 1, wherein the press forming apparatus is a change in height of the interval adjusting member.
The invention according to claim 5 is the press molding apparatus according to any one of claims 1 to 4, wherein the interval adjusting member is constituted by a plurality of members, and each member includes a temperature adjusting mechanism. Features.

According to a sixth aspect of the present invention, a movable cooling member is provided in the vicinity of the interval adjusting member having a heating mechanism, and the interval adjusting member is cooled by bringing the cooling member into contact with the interval adjusting member. A press molding apparatus according to any one of claims 1 to 5 is characterized.
According to a seventh aspect of the present invention, the cooling member is in contact with at least one of the upper die and the lower die, and a function of cooling the gap adjusting member by contacting the gap adjusting member. The press molding apparatus according to claim 6, which has a function of cooling the mold and the molded product.
The invention according to claim 8 is characterized by the press forming apparatus according to any one of claims 1 to 7, wherein the gap adjusting member or the cooling member is cooled by a fluid.
According to the ninth aspect of the present invention, the surface of the distance adjusting member that abuts against the mold and the surface of the mold that faces the surface are composed of a pair of convex spherical surface and concave spherical surface, and the curvature of the concave spherical surface. The press molding apparatus according to claim 1, wherein is equal to or greater than a curvature of the convex spherical surface.
The invention described in claim 10 is characterized by the press molding apparatus according to any one of claims 1 to 9, wherein a heat insulating mechanism is provided between the gap adjusting member and the mold.
The invention according to claim 11 is characterized in that the press forming apparatus according to any one of claims 1 to 10, wherein a distance detecting means is provided between the upper mold and the lower mold. And
The invention according to claim 12 is the press forming apparatus according to any one of claims 1 to 11, wherein the interval adjusting member is provided with a temperature detecting means.
In addition, the invention described in claim 13 uses the press molding apparatus described in claims 1 to 12 to control the temperature of the interval adjusting member to change the dimensions, thereby adjusting the parallelism and interval between the upper die and the lower die. It is characterized by a press molding method in which the mold is moved under control.
The invention as set forth in claim 14 is characterized by a molded product formed by using the press molding apparatus according to claims 1 to 12.

According to the present invention, the interval adjusting members are arranged at three or more locations that do not contact the press material in the mold structure, the temperature adjusting mechanism is provided on the interval adjusting member, and the temperatures of the interval adjusting members are independently set. By controlling, the parallelism and interval between the upper mold and the lower mold can be controlled to desired values.
In addition, the conventional distance adjusting member only regulates the parallelism and the distance between the upper mold and the lower mold to a constant value. However, the distance adjusting member of the present invention includes a temperature adjusting mechanism. The mold parallelism and spacing can be controlled to desired values.
Furthermore, in the case where a conventional gap adjusting member is provided and the thickness of the molded product is controlled, it is necessary to create a new gap adjusting member material and thickness each time the molding material and molding conditions change. However, since the interval adjusting member of the present invention includes a temperature adjusting mechanism, the parallelism and interval between the upper die and the lower die can be controlled to desired values.
Since the interval adjusting member of the present invention utilizes expansion and contraction due to temperature change, the parallelism and the interval between the upper die and the lower die can be adjusted without removing the interval adjusting member and sandwiching the shim. It can be controlled to a desired value only by adjustment, and there is no need to provide a large-scale device.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic sectional view showing a configuration of a first embodiment of a press molding apparatus according to the present invention. FIG. 2 is a schematic view showing a mold structure excluding the pressure mechanism of the press molding apparatus of FIG.
The press forming apparatus A includes a lower die plate 1 fixed to the main body of the forming device and an upper die plate 2 that moves up and down in a vertical direction so as to be able to contact and separate from the lower die plate 1 (first). In the first embodiment, the upper mold 3 is movable and the lower mold 4 is fixed, but the upper mold 3 may be fixed and the lower mold 4 may be movable, and both the upper mold 3 and the lower mold 4 may be movable).
The mold is a mold for an optical lens array (transfer surface length: A3 length, for example), which is composed of an upper mold 3 and a lower mold 4, and an upper mold 3 and a lower mold having a concave spherical surface 3a and a convex spherical surface 4a facing each other. The transfer surface 4 is mirror-finished by grinding and polishing.
In this example, the upper die 3 is attached to the lower surface of the upper die plate 2 via an upper heat insulating plate 5 (heat insulating mechanism), and the lower die 4 is attached to the lower die plate 1 on the lower die heat insulating plate 6 (heat insulating). Mechanism). The upper mold 3 and the lower mold 4 are provided with a heating mechanism 7 so that the mold and the press material can be heated. Further, a gap adjusting member (temperature sensor) 8 is provided between the upper die plate 2 and the lower die plate 1. In the example shown in FIGS. 1 and 2, the upper die 3 and the lower die 4 are provided with a heating mechanism 7 for heating. However, the upper die plate 2, the lower die plate 1, and the upper die are used for temperature control. 3, the lower mold 4 and the interval adjusting member 8 are provided with a heating mechanism 7 and a cooling mechanism 10 as necessary. In this respect, the configuration shown in the drawings is an example.

FIG. 3 shows the mold structure of FIG. 2, the spacing adjusting member 8 having a structure different from that of FIGS. 1 and 2 (a structure having a plurality of members consisting of planting parts on the table), its heating mechanism 7 and cooling. 3 is a schematic perspective view illustrating the mechanism 10. FIG. FIG. 4 is a schematic view showing a structural modification of the interval adjusting member 8. The spacing adjusting member 8 is provided with a heating mechanism (electric heater) 7 and a cooling mechanism (cooling water (oil) pipe) 10 as shown in FIG. (See FIG. 4). The distance adjusting member 8 is also a temperature sensor, and the detection of this sensor can control the degree of expansion and contraction or bending by adjusting heating or cooling.
Further, as shown in FIG. 2, concave spherical surfaces 2a are respectively formed on the upper heat insulating plate 5 at three locations that do not come into contact with the press material during molding. Each concave spherical surface 2a is formed so as to bend in the same downward direction as the vertical movement direction of the upper mold 3. An interval adjusting member 8 provided with a temperature adjusting mechanism is fixed on the lower mold heat insulating plate 6 below each concave spherical surface 2 a formed at three locations on the upper die plate 2.
The surface facing the concave spherical surface 2a formed on the upper heat insulating plate 5 of the distance adjusting member 8 is a convex spherical surface 8a, and its curvature is equal to or less than the curvature of the concave spherical surface 2a. The spacing adjusting member 8 controls the parallelism and spacing between the upper die 3 and the lower die 4 by utilizing expansion and contraction (specific example is illustrated in FIG. 4) due to the temperature of the aluminum member.
In the above description, the interval adjusting member 8 is provided in the mold structure, and the expandable member is provided with a temperature adjusting mechanism during this time to expand and contract, thereby expanding and contracting in the height direction in the example of FIG. It has been described that the upper and lower heat insulating plates 5 and 6 and the distance between the upper and lower dies 3 and 4 are adjusted and controlled by extending and contracting in the height direction.

Next, FIG. 5 to FIG. 9 show an example in which a cooling member 9 separate from the interval adjusting member 8 is arranged between the interval adjusting member 8 and the upper and lower molds 3 and 4. Here, since the space adjusting member 8 and the upper and lower molds 3 and 4 are cooled by the cooling member 9, the space adjusting member 8 and the upper and lower molds 3 and 4 are, for example, as shown in FIG. The cooling mechanism 10 such as the interval adjusting member 8 may be omitted (although it may be present).
FIG. 5 is a schematic cross-sectional view for explaining the operation of setting a blank (press material) in the mold of FIG. FIG. 6 is a schematic sectional view for explaining the operation of lowering the upper mold in the mold of FIG. That is, the upper die 3 and the lower die 4 are heated and the interval adjusting member 8 is expanded by heating to lower the upper die 3. Here, the lower mold 4 and the upper mold 3 are separated by the expansion of the interval adjusting member 8. FIG. 7 is a schematic sectional view for explaining the movement operation of the cooling member 9 and the contraction of the interval adjusting member 8 in the mold of FIG. During this time, the blank between the lower mold 4 and the upper mold 3 is molded by a press operation by contraction of the expandable member 8.
In FIG. 5, a movable cooling member 9 is provided in the vicinity of the interval adjusting member 8 having the heating mechanism 7, and the interval adjusting member 8 is cooled by bringing the cooling member 9 into contact with the interval adjusting member 8 as shown in FIG. Do.
The cooling member 9 has a function of cooling the gap adjusting member 8 by being brought into contact with the gap adjusting member 8, and cooling of the mold and the molded product by being brought into contact with at least one of the upper die 3 and the lower die 4. It has a function to perform.
FIG. 8 is a schematic cross-sectional view for explaining cooling of the mold by moving the cooling member 9 to the mold in the mold of FIG. FIG. 9 is a schematic cross-sectional view for explaining the mold release operation by the heating operation of the interval adjusting member 8.

FIG. 10 is a diagram showing the relationship between the temperature and the height of the interval adjusting member 8 in the first embodiment. Each interval adjusting member 8 has a height of 300 mm, and is manufactured by grinding and polishing an aluminum member at the same time. The variation width of each interval adjusting member 8 is extremely small.
The relationship between the temperature and the height of the gap adjusting member 8 is, for example, that the width of the gap control when the temperature of the gap adjusting member 8 is changed from 20 ° C. to 100 ° C. is 0.55 mm and the press material from the position near the press material. Can be pressed and applied with sufficient pressure.
Each interval adjustment member 8 is provided with an electric heater and a temperature sensor (not shown), and the electric heater and the temperature sensor are connected to a display device and a controller (not shown), and the display device has a temperature measurement value of each interval adjustment member 8. Is displayed digitally, and the controller is provided with an input device such as a numeric keypad so that the temperature of each interval adjusting member 8 can be controlled independently.
A measurement sensor (not shown) for measuring the distance (parallelism) between the upper die 3 and the lower die 4 is disposed at a location where the press material between the upper die 3 and the lower die 4 is not in contact. The measurement sensor is connected to a display device (not shown).
On the display device, the measured value of the distance between the upper mold 3 and the lower mold 4 measured by each measurement sensor and the parallelism calculated based on the measured value are digitally displayed.
And the cooling member 9 is each arrange | positioned on the line | wire which connects a metal mold | die and each space | interval adjustment member 8, and the cooling member 9 is provided with the cooling function which circulated cooling water (oil), for example. Further, the cooling member 9 is movable, and can come into contact with each interval adjusting member 8 and the mold.
In the first embodiment, aluminum is used for the distance adjusting member 8, but other metals, resins such as polyimide, ceramics, or the like may be used, or a fluid such as oil may be enclosed.
In the first embodiment, the gap adjusting member 8 is provided between the upper die plate 2 and the lower die plate 1. However, the upper die 1 and the upper die 1 are arranged between the upper die plate 2 and the lower die 4. It may be provided between the lower die plates 1 and between the upper die 3 and the lower die 4.

Next, the operation | movement at the time of shaping | molding of the press molding apparatus of this Embodiment comprised as mentioned above is demonstrated collectively. First, a blank molded product (polycarbonate) is supplied into the mold, and the mold and the blank molded product are heated to a temperature near the softening point.
In the first embodiment, polycarbonate is a press-molded object as a blank molded product, but other materials such as glass as well as other resins such as PMMA (polymethyl methacrylate) may be used.
Moreover, press molding may be performed using a film, a sheet, or the like, or molten resin, molten glass, or the like may be injected and filled. In the first embodiment, as an example, an electric heater is used to heat the mold and the blank molded product, but other heating means such as an infrared lamp may be used.
Next, the upper mold | type 3 is moved so that the space | interval adjustment member 8 arrange | positioned may be contacted. Subsequently, the parallelism of the press molding apparatus is measured by measuring the distance between the upper mold 3 and the lower mold 4 of the press molding apparatus using the arranged measurement sensor. And the temperature of each space | interval adjustment member 8 is adjusted so that the space | interval (parallelism) of the upper mold | type 3 and the lower mold | type 4 may become a desired value.
After adjusting the parallelism, the cooling members 9 are moved so that the distance between the upper mold 3 and the lower mold 4 becomes a predetermined value, and the distance adjusting members 8 are brought into contact with each of the distance adjusting members 8 to cool and contract. . Thereby, the upper mold | type 3 contacts a blank molded product, it pinches | interposes with the upper mold | type 3 and the lower mold | type 4, and press-deforms a blank molded product.
After the deformation, each cooling member 9 is moved and brought into contact with the mold to cool the mold and the blank molded product to a temperature below the softening point. After the temperature of the mold and the blank molded product is lower than the softening point, each spacing adjusting member 8 is heated and expanded so that the distance between the upper mold 3 and the lower mold 4 becomes a predetermined value. The mold was raised in parallel and released, and the press-molded product was taken out.
In the first embodiment, each interval adjusting member 8 is heated and the upper die 3 is raised in parallel to release the mold, but the temperature of each interval adjusting member 8 is controlled and the upper die 3 is inclined. The mold release is not limited to parallel mold release, such as releasing a part of the mold and blowing air or the like into the mold while weakening the adhesion to the mold.

11 to 14 show a second embodiment, and show the structure of only the base portion shown in FIG. That is, the height adjustment is performed by utilizing the curvature (warpage) generated by the difference in expansion due to heating. Here, the height adjustment (curvature adjustment) by the interval adjusting member 8 is performed by adjusting the adjustment of the heating mechanism 7 exemplified by the electric heater and the cooling mechanism 10 by the cooling oil.
FIG. 11 is a schematic cross-sectional view illustrating a case where a sheet is supplied in the mold of FIG. FIG. 12 is a schematic sectional view for explaining the operation of lowering the upper mold in the mold of FIG. FIG. 13 is a schematic cross-sectional view for explaining the pressing operation by moving the cooling oil and turning off the heater of the distance adjusting member 8 in the mold of FIG.
FIG. 14 is a schematic cross-sectional view for explaining mold cooling and turning-on and releasing operations of the heater of the interval adjusting member 8. FIG. 15 is a diagram showing the relationship between the heating temperature and the height of the interval adjusting member 8 (here, aluminum material) in the second embodiment.
First, the configuration of the press molding apparatus will be described. 11 and 14, the press molding apparatus includes a lower die plate 1 fixed to the molding apparatus body and an upper die plate 2 that moves up and down so as to be able to contact and separate from the lower die plate 1. Have.
The mold is a light guide path mold (transfer surface φ300 mm), and is composed of an upper mold 3 and a lower mold 4. The upper mold 3 is attached to the lower surface of the upper mold plate 2, and the lower mold 4 is a lower mold. It is fixed to the upper surface of the plate 1.
The upper mold 3 and the lower mold 4 are provided with a heater and a temperature sensor (not shown) so that the mold and the press material can be heated. Further, the interval adjusting member (temperature sensor) 8 is disposed at four locations that do not come into contact with the press material when the lower die is molded.
The spacing adjusting member 8 controls the parallelism and spacing between the upper die 3 and the lower die 4 by utilizing an expansion difference (warpage) due to a temperature distribution (temperature difference) of the aluminum member. Each aluminum member has a height of 50 mm and a length of 300 mm, and is manufactured by grinding and polishing at the same time, and the variation width of each aluminum member is extremely small.
Each aluminum member includes an electric heater, a cooling oil pipe, and a temperature sensor (not shown), and the electric heater and the temperature sensor are connected to a display device and a controller (not shown).

The display device digitally displays the measured value of the temperature of each interval adjusting member 8, and the controller is provided with an input device such as a numeric keypad so that the temperature of each interval adjusting member 8 can be controlled independently. It has become.
Each piping for cooling oil is connected to each mold temperature controller (not shown), and the cooling oil of a predetermined temperature is circulated so that each interval adjusting member 8 can be cooled. FIG. 15 shows the relationship between the temperature difference between the upper surface and the lower surface of the aluminum member and the height.
For example, the width of the interval control when a temperature difference of 30 ° C. is applied to each aluminum member is 0.93 mm, and the press material from the vicinity of the press material can be pressed and a sufficient pressure can be applied.
A measurement sensor that measures the distance (parallelism) between the upper die 3 and the lower die 4 (not shown) is disposed at a location where the press material of the upper die 3 and the lower die 4 does not come into contact. The measurement sensor is connected to a display device (not shown).
On the display device, the measured value of the distance between the upper mold 3 and the lower mold 4 measured by each measurement sensor and the parallelism calculated based on the measured value are digitally displayed.

Next, the operation | movement at the time of shaping | molding of the press molding apparatus of a present Example comprised as mentioned above is demonstrated.
First, the PMMA sheet is supplied into the mold, and the mold and the PMMA sheet are heated to a temperature near the softening point. Next, the upper mold 3 is moved so as to come into contact with the interval adjusting member 8 provided.
Subsequently, the distance between the upper mold 3 and the lower mold 4 of the press molding apparatus is measured by the arranged sensor to measure the parallelism of the press molding apparatus. Then, the temperature difference between the upper surface and the lower surface of each interval adjusting member 8 is adjusted by an electric heater and cooling oil so that the interval (parallelism) between the upper die 3 and the lower die 4 becomes a desired value.
After adjusting the parallelism, the temperature difference between the upper surface and the lower surface of each interval adjusting member 8 is narrowed (adjusted by an electric heater and cooling oil) so that the interval between the upper die 3 and the lower die 4 becomes a predetermined value. The mold 3 is brought into contact with the PMMA sheet, and is sandwiched between the upper mold 3 and the lower mold 4, and the PMMA sheet is pressure-deformed.
After deformation, the mold and PMMA sheet are cooled to a temperature below the softening point. The temperature difference between the upper surface and the lower surface of each spacing adjusting member 8 is expanded so that the distance between the upper mold 3 and the lower mold 4 becomes a predetermined value, and the upper mold 3 is raised in parallel to release the mold. The product was taken out.
For comparison, a molding experiment similar to that of the second embodiment was performed as a conventional example 1 using a mold not provided with a gap adjusting member and a cooling member.
For comparison, as conventional example 2, a molding experiment similar to that of the second embodiment was performed using a mold provided with an interval adjusting member without a temperature control function.

In the first and second embodiments and the conventional examples 1 and 2, the light guide and the optical lens array are created. However, the present invention is not limited to this, and other optical elements and other generally produced by press molding. Can be applied to things.
The center thickness variation width of each lens of the lens array molded in the first embodiment was 0.2 μm, and all molded products could be used.
Moreover, when the variation width of the groove depth of the light guide formed in the second embodiment, Conventional Examples 1 and 2 was measured, the following results were obtained.
Conventional example 1: 20 μm (some grooves were not transferred at all)
Conventional example 2: 8 μm (light efficiency was different and could not be used)
Second embodiment: 0.4 μm (The variation of the groove depth of the mold was 0.3 μm, and the mold shape was almost transferred, and all molded products could be used.)
Since the dimensional change due to the temperature change of the space adjusting member 8 is a change in the height of the space adjusting member 8 utilizing expansion and contraction due to temperature, the parallelism and the space between the upper die 3 and the lower die 4 can be efficiently obtained. The value can be controlled.
When the distance between the upper mold 3 and the lower mold 4 is narrow, the control of the distance between the upper mold 3 and the lower mold 4 may be small when the height of the distance adjusting member 8 utilizing expansion and contraction due to temperature is changed. However, if the dimensional change due to the temperature change of the gap adjusting member 8 is a change in the height of the gap adjusting member 8 using the expansion difference (warp) due to the temperature distribution (temperature difference), the upper mold 3 and the lower mold 4 Even when the interval is narrow, it is possible to secure a sufficient control width of the distance between the upper die 3 and the lower die 4.
The dimensional change due to the temperature change of the interval adjusting member 8 is caused by the change in the height of the interval adjusting member 8 using expansion and contraction due to temperature and the difference in the expansion (warp) due to the temperature distribution (temperature difference). By changing the height, it is possible to further expand the control of the parallelism and the distance between the upper die 3 and the lower die 4 as compared with the case where only one of them is used.
The interval adjusting member 8 is constituted by a plurality of members, and each member is provided with a temperature adjusting mechanism, so that a member having a large height and a member having a large linear expansion coefficient are coarsely adjusted, a member having a small height, and a wire. A member having a small expansion coefficient can improve the accuracy of control of the parallelism and interval between the upper mold 3 and the lower mold 4 such as fine adjustment.

A movable cooling member is provided in the vicinity of the gap adjusting member 8 having a heating mechanism, the cooling member is brought into contact with the gap adjusting member, and the gap adjusting member 8 is cooled by changing the boundary condition, whereby the gap adjusting member 8 is cooled. Can be efficiently cooled, and the molding cycle can be shortened.
The cooling member 9 has a function of cooling the interval adjusting member 8 by being brought into contact with the interval adjusting member 8 and a mold and a mold by being brought into contact with at least one of the movable mold and the fixed side and changing the boundary condition. By cooling the product, the interval adjusting member 8 can be efficiently cooled, and the molding cycle can be shortened.
Since the cooling function of the interval adjusting member 8 or the cooling member 9 is based on the fluid, the interval adjusting member 8 or the cooling member 9 can be efficiently cooled without providing a large-scale device.
When the surface of the distance adjusting member 8 that contacts the mold (upper mold 3 or lower mold 4) and the surface of the mold (upper mold 3 or lower mold 4) that faces the surface are flat, the mold If the degree of parallelism is greatly deviated, contact is made at a point. Therefore, a great load is applied, and there is a possibility that the interval adjusting member 8 or the mold is damaged.
The surface of the distance adjusting member 8 that is in contact with the mold (upper mold 3 or lower mold 4) and the surface of the mold (upper mold 3 or lower mold 4) facing the surface are a pair of convex spherical surface 3a and concave spherical surface 4a. Since the curvature of the concave spherical surface 4a is equal to or greater than that of the convex spherical surface 3a, even when the parallelism of the mold is greatly deviated, the surface can be contacted, and the distance adjusting member 8 or the gold It is possible to prevent the mold from being damaged.

By providing a heat insulation mechanism between the gap adjusting member 8 and the mold (upper mold 3 or lower mold 4), the accuracy of temperature control of the gap adjusting member 8 is improved, and the parallelism between the upper mold 3 and the lower mold 4 and It is possible to control the interval more easily.
The distance between the upper mold 3 and the lower mold 4 in the mold (the parallelism and distance between the upper mold 3 and the lower mold 4 can be adjusted, so that workability can be greatly improved. Since the degree can be measured, it is easy to understand the cause when a defect occurs.
Since the temperature detecting means is provided in the gap adjusting member 8, the temperature of the gap adjusting member 8 can be adjusted while directly measuring the temperature of the gap adjusting member 8, so that the parallelism between the upper die 3 and the lower die 4 and It is possible to control the interval more easily.
Using the press molding apparatus according to the present invention, the dimensional change due to the temperature change of the gap adjusting member 8 is used to control the parallelism and the gap between the upper die 3 and the lower die 4 (mold clamping, pressing, By performing the mold release), it is possible to precisely control the parallelism and spacing between the upper mold and the lower mold without providing a large-scale device, so that it is possible to obtain a press-molded product with good shape accuracy. it can.
By using the press molding apparatus according to the present invention, it is possible to precisely control the parallelism and spacing between the upper mold 3 and the lower mold 4 without providing a large-scale apparatus. Goods can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic sectional drawing which shows the structure of 1st Embodiment of the press molding apparatus by this invention. Schematic which shows a metal mold | die structure except the pressure mechanism of the press molding apparatus of FIG. The schematic perspective view explaining the heating mechanism and cooling mechanism in a space | interval adjustment member. Schematic which shows the structural example of a space | interval adjustment member. The schematic sectional drawing explaining the operation | movement which sets a blank in the metal mold | die of FIG. FIG. 3 is a schematic cross-sectional view for explaining an upper mold lowering operation in the mold of FIG. 2. The schematic sectional drawing explaining the movement of a cooling member and the cooling operation of a space | interval adjustment member in the metal mold | die of FIG. The schematic sectional drawing explaining the movement of a cooling member and cooling of a metal mold | die in the metal mold | die of FIG. The schematic sectional drawing explaining the heating operation and mold release operation | movement of a space | interval adjustment member. The figure which shows the relationship between the temperature of the space | interval adjustment member in 1st Embodiment, and height. The schematic sectional drawing explaining the operation | movement which supplies a sheet | seat in a metal mold | die. The schematic sectional drawing explaining operation | movement of the upper mold | type lowering in a metal mold | die. The schematic sectional drawing explaining the movement of the cooling oil in the metal mold | die, the turning-off of the heater of a space | interval adjustment member, and press operation. FIG. 3 is a schematic cross-sectional view for explaining mold cooling, turning-on of a heater of a distance adjusting member, and mold release operation in a mold. The figure which shows the relationship between the temperature of the space | interval adjustment member in 2nd Embodiment, and height.

Explanation of symbols

A press molding device, 1 lower die plate, 2 upper die plate, 2a concave spherical surface, 3 upper die, 3a concave spherical surface, 4a convex spherical surface, 5 thermal insulation mechanism (upper thermal insulation plate), 6 thermal insulation mechanism (lower thermal insulation) Plate), 7 heating mechanism (electric heater), 8 interval adjusting member (temperature sensor), 8a convex spherical surface, 9 cooling member, 10 cooling mechanism

Claims (14)

  A mold structure comprising: an upper die plate on which one or more upper dies are supported; and a lower die plate on which one or more lower dies corresponding to the upper dies are supported; In a press molding apparatus that presses and molds a heat-softened press material using a lower mold, the upper die plate or the upper mold is located at three or more positions that do not contact the press material in the mold structure. A press forming, characterized in that a spacing adjusting member is disposed between any one of the lower die plate and the lower die, and a temperature adjusting mechanism for causing a dimensional change of the spacing adjusting member is provided in the spacing adjusting member. apparatus.   The press molding apparatus according to claim 1, wherein the dimensional change due to a temperature change of the gap adjusting member is a change in the height of the gap adjusting member utilizing expansion and contraction due to temperature.   2. The press molding apparatus according to claim 1, wherein the dimensional change due to the temperature change of the gap adjusting member is a change in the height of the gap adjusting member using an expansion difference due to a temperature distribution.   The dimensional change due to the temperature change of the interval adjusting member is a change in the height of the interval adjusting member using expansion / contraction due to temperature and a change in the height of the interval adjusting member using an expansion difference due to temperature distribution. The press molding apparatus according to claim 1.   The press forming apparatus according to any one of claims 1 to 4, wherein the interval adjusting member includes a plurality of members, and each member includes a temperature adjusting mechanism.   The cooling member is provided in the vicinity of the interval adjusting member having a heating mechanism, and the interval adjusting member is cooled by bringing the cooling member into contact with the interval adjusting member. The press molding apparatus as described in any one.   The cooling member has a function of cooling the gap adjusting member by bringing it into contact with the gap adjusting member, and a function of cooling the mold and the molded product by being brought into contact with at least one of the upper mold or the lower mold. The press molding apparatus according to claim 6.   The press forming apparatus according to any one of claims 1 to 7, wherein the interval adjusting member or the cooling member performs cooling with a fluid.   The surface of the distance adjusting member that contacts the mold and the surface of the mold that faces the mold are composed of a pair of convex spherical surface and concave spherical surface, and the curvature of the concave spherical surface is equal to or greater than the curvature of the convex spherical surface. The press molding apparatus according to claim 1, wherein the press molding apparatus is provided.   The press molding apparatus according to any one of claims 1 to 9, wherein a heat insulating mechanism is provided between the gap adjusting member and the mold.   The press molding apparatus according to any one of claims 1 to 10, wherein a distance detecting unit is provided between the upper mold and the lower mold.   The press forming apparatus according to any one of claims 1 to 11, wherein the interval adjusting member is provided with a temperature detecting means.   The press molding apparatus according to claim 1 is used to change the dimension by controlling the temperature of the gap adjusting member, and to move the mold by controlling the parallelism and the gap between the upper mold and the lower mold. A press forming method characterized. A molded product formed by using the press molding apparatus according to claim 1.

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