Patent Application
20180243953
The present invention relates to a resin-molding device, resin-molding method, and method for producing a resin-molded product.
It has been common to seal electronic parts with a resin material in order to protect the electronic parts from light, heat, moisture and other environmental factors. Patent Literature 1 discloses a resin-sealing device designed to obtain resin-sealed products free of qualitative variations even when the various resin-sealing conditions become different due to the shape of the product to be molded as well as other factors. The resin-sealing device includes: a section for supplying a product to be molded with resin (“target product”); a target-product measurement section for measuring the thickness of a semiconductor chip mounted on the target product; a resin supply section for supplying, to the target product, a liquid resin to be used for the resin sealing; a resin-molding section for resin-molding the target product supplied with the liquid resin by means of a sealing die; a molded-product measurement section for measuring the thickness of the resin-sealed portion of the molded product obtained through the resin-molding; a storage section for the molded product; and a control section for controlling each of these sections. The control section further includes a regulation means for regulating the amount of resin to be supplied to the target product through the resin supply section based on the results of the measurements by the measurement sections.
Patent Literature 1: JP 2006-315184 A
Patent Literature 2: JP 2007-125783 A
Patent Literature 3: JP 2010-094931 A
In the resin-sealing device described in Patent Literature 1, no consideration is given to the fact that the molding die or a member to which the molding die is attached may undergo distortion or similar deformation during the die-clamping process. Therefore, the problem of an unwanted deformation of the resin-molded product due to the deformation of the molding die or other related members has been inevitable.
The problem to be solved by the present invention is to provide a resin-molding device, resin-molding method, and method for producing a resin-molded product which can prevent the resin-molded product from being significantly affected even when the molding die or a member to which the molding die is attached is deformed due to the die-clamping operation.
One mode of the resin-molding device according to the present invention developed for solving the previously described problem includes:
a) a first platen and a second platen;
b) a first molding die to be attached to the first platen;
c) a second molding die to be attached to the second platen and arranged so as to face the first molding die;
d) a die-clamping mechanism for clamping the first molding die and the second molding die together by decreasing the distance between the first platen and the second platen, and for separating the first molding die and the second molding die from each other by increasing the distance between the first platen and the second platen; and
e) a flatness adjuster including an adjustment member for adjusting the parallelism between the die surface of the first molding die and the die surface of the second molding die, or the flatness of a resin-molded product to be molded with the first molding die and the second molding die.
Another mode of the resin-molding device according to the present invention developed for solving the previously described problem includes:
a) a first platen and a second platen;
b) a first molding die to be attached to the first platen;
c) a second molding die to be attached to the second platen and arranged so as to face the first molding die, the second molding die including a bottom-surface member and a side-surface member constituting a cavity;
d) a die-clamping mechanism for clamping the first molding die and the second molding die together by decreasing the distance between the first platen and the second platen, and for separating the first molding die and the second molding die from each other by increasing the distance between the first platen and the second platen; and
e) a flatness adjuster to be arranged between the first platen and the first molding die, the flatness adjuster including an adjustment member for adjusting the parallelism between the die surface of the first molding die and the die surface of the second molding die, or the flatness of a resin-molded product to be molded with the first molding die and the second molding die.
One mode of the resin-molding method according to the present invention developed for solving the previously described problem includes:
a preparation process including a step of preparing: a first platen and a second platen; a first molding die to be attached to the first platen; a second molding die to be attached to the second platen and arranged so as to face the first molding die; a die-clamping mechanism for clamping the first molding die and the second molding die together by decreasing the distance between the first platen and the second platen, and for separating the first molding die and the second molding die from each other by increasing the distance between the first platen and the second platen; and a flatness adjuster including an adjustment member for adjusting the parallelism between the die surface of the first molding die and the die surface of the second molding die, or the flatness of a resin-molded product to be molded with the first molding die and the second molding die; and
a die-clamping process including a step of clamping the first molding die and the second molding die together.
Another mode of the resin-molding method according to the present invention developed for solving the previously described problem includes:
a preparation process including a step of preparing: a first platen and a second platen; a first molding die to be attached to the first platen; a second molding die to be attached to the second platen and arranged so as to face the first molding die, the second molding die including a bottom-surface member and a side-surface member constituting a cavity; a die-clamping mechanism for clamping the first molding die and the second molding die together by decreasing the distance between the first platen and the second platen, and for separating the first molding die and the second molding die from each other by increasing the distance between the first platen and the second platen; and a flatness adjuster to be arranged between the first platen and the first molding die, the flatness adjuster including an adjustment member for adjusting the parallelism between the die surface of the first molding die and the die surface of the second molding die, or the flatness of a resin-molded product to be molded with the first molding die and the second molding die;
a target-object supply process including a step of supplying an object to be molded to the first molding die;
a resin-material supply process including a step of supplying a resin material to the cavity of the second molding die; and
a die-clamping process including a step of clamping the first molding die and the second molding die together.
A method for producing a resin-molded product according to the present invention developed for solving the previously described problem includes a step of producing a resin-molded product by the resin-molding method according to the present invention.
With the resin-molding device, resin-molding method, or method for producing a resin-molded product according to the present invention, it is possible to prevent the resin-molded product from being significantly affected even when the molding die or a member to which the molding die is attached is deformed due to the die-clamping operation.
Embodiments of the resin-molding device, resin-molding method, and method for producing a resin-molded product are hereinafter described using
The resin-molding device 10 in the present embodiment is constructed on a pedestal 131 placed on a floor, the pedestal having a rectangular shape on a plan view. Four vertical tie bars 132 are respectively provided at the four corners of the pedestal 131 (only two of the tie bars 132 are shown). A first platen (upper platen, which corresponds to the fixed platen in the present invention) 11 and second platen (lower platen, which corresponds to the movable platen in the present invention) 12 are arranged above the pedestal 131. The upper ends of the tie bars 132 are respectively connected to the four corners of the first platen 11, thereby holding the first platen 11 in the immobile state. The second platen 12 have through-holes formed at its four corners, through which the tie bars 132 are inserted, thereby allowing for the vertical movement of the second platen 12. A toggle link 133 which is the drive mechanism for making the second platen 12 vertically move (the die-clamping mechanism in the present invention) is located between the pedestal 131 and the second platen 12. The toggle link 133 has two toggle mechanisms. The points of action of the two toggle mechanisms are attached to the lower surface of the second platen 12. Within the space between the first and second platens 11 and 12, a molding die 16 and other elements are arranged, as will be described later. Although the resin-molding device 10 in the present embodiment has the first (upper) platen 11 provided as the fixed platen in the immobile state and the second (lower) platen 12 provided as the movable platen, the states of the two platens may be reversed. It is also possible to provide both first and second platens 11 and 12 as movable platens. In that case, each of the first and second platens 11 and 12 should be provided with the toggle link 133 or similar die-clamping mechanism. In place of the toggle link 133 used in the drive mechanism (die-clamping mechanism) in the present embodiment, a different type of die-clamping mechanism may be used, such as a hydraulic or pneumatic drive mechanism, or a die-clamping mechanism which uses a ball screw or similar element.
Below the first platen 11, an upper heater plate 151, flatness adjuster 14, and upper die 161 (the first molding die in the present invention) of the molding die 16 are sequentially arranged in the top-to-bottom direction. A heater plate is a plate member made of a metal, such as iron, stainless steel or Ti-6Al-4V alloy, in which a heater is embedded. It should be noted that the components in the present embodiment as well as their order of arrangement are mere examples. The configuration of those components and their order of arrangement may be appropriately changed as long as the flatness adjuster 14 is located at such a position where it can adjust the parallelism between the die surface of the upper die 161 (the first molding die in the present invention) and that of a lower die 162 (the second molding die in the present invention), or the flatness of a resin-molded product to be molded with the molding die 16. The upper die 161 of the molding die 16 is located at the die arrangement section of the first platen 11 In many cases, this die arrangement section is located in a central area on the plate surface of the first platen 11, although it does not always need to be in that area. The die surface of the upper die 161 is the surface which faces the lower die 162 and includes, for example, the surface to which a substrate 22 should be attached. The die surface of the lower die 162 is the surface which faces the upper die 161 and includes, for example, the bottom surface of cavity C (this surface is the upper surface of a bottom-surface member 1623, which will be described later). An upper ambient air blockage member 174 fitted with O-rings 173 and 175 at its upper and lower ends is arranged along the circumferential edge of the lower surface of the first platen 11. During the die-clamping operation of the molding die 16, the space in which the molding die 16 is located is shielded from the surrounding area by the O-ring 173, upper ambient air blockage member 174 and O-ring 175 as well as a lower ambient air blockage member 172 and O-ring 171, which will be described later.
Above the second platen 12, a lower heater plate 152 and the lower die 162 (the second molding die in the present invention) of the molding die 16 are arranged. The lower die 162 of the molding die 16 is located at the die arrangement section of the second platen 12. This die arrangement section also does not always need to be in the central area on the plate surface of the second platen 12, although the upper and lower dies 161 and 162 must be arranged so that they directly face each other. The lower die 162 includes: a lower-die base plate 1621; a lower-die side block 1622 which is a member for guiding the lower-die base plate 1621 into the die arrangement section; a bottom-surface member 1623 fixed to the central portion on the upper surface the lower-die base plate 1621; and a side-surface member 1625 shaped like a frame surrounding the bottom-surface member 1623 and arranged on the upper surface of the lower-die base plate 1621 via an elastic member 1624, such as a spring. In a resin-molding process (which will be described later), the cavity C is formed by the upper surface of the bottom-surface member 1623 and the inner side surface of the side-surface member 1625. The lower ambient air blockage member 172 is arranged along the circumferential edge of the upper surface of the second platen 12 via the O-ring 171.
As shown in
In
The flatness adjuster 14 in the present embodiment is located between the upper heater plate 151 and the upper die 161. It is also possible to arrange the flatness adjuster 14 between the lower die 162 and the lower heater plate 152. That is to say, the flatness adjuster 14 can be located at one or both of the upper and lower dies 161 and 162.
An upper-die side block 191 fixed to the upper heater plate 151 is located on the lateral side of the upper block 161. A pressing plate 192 (the support member in the present invention) for supporting the upper die 161 is attached to the lower end of the upper-die side block 191. The pressing plate 192 is fixed with a bolt 193 (the fixation member in the present invention) which is inserted through the pressing plate 192 and the upper-die side block 191 into a screw hole formed in the upper heater plate 151. Loosening the bolt 193 allows the pressing plate 192 and the upper die 161 to move downward, thereby allowing the upper die 161 to be replaced as needed. That is to say, the upper-die side block 191, pressing plate 192 and bolt 193 constitute a mechanism corresponding to the attachment mechanism in the present invention. The attachment mechanism allows the upper die 161 to be attached to the first platen 11 in a freely removable form.
An operation of the resin-molding device 10 in the first embodiment is hereinafter described using
The adjustment of the flatness adjuster 14 is performed as follows: Initially, the bolt 193 is loosened to make the upper die 161 move downward along with the pressing plate 192 (
The next step is to change the arrangement of the adjustment members 141 placed in the adjustment member holder portions 142 of the detached flatness adjuster 14 as well as the height, diameter (cross-sectional area) and/or rigidity (material) of the adjustment members 141 to be used. Specifically, the arrangement and/or other factors related to the adjustment members 141 are changed so that a predetermined degree of parallelism is achieved between the die surface of the upper die 161 and that of the lower die 162 when the molding die 16 is clamped, with the result that the resin-molded product to be eventually molded with the molding die 16 will have a predetermined degree of flatness. For example, if a resin-molded product prepared in a die-clamping test (which will be described later) has a local portion that is thicker than the other portions, adjustment members 141 having a larger diameter (cross-sectional area) are arranged at and near the thick portion, while adjustment members having a smaller diameter (cross-sectional area) are arranged at the other portions. By this arrangement, the flatness of the resin-molded product is maintained and the variation in its thickness is reduced. If the flatness adjuster 14 is also provided between the lower die 162 and the lower heater plate 152, the flatness of the resin-molded product can be adjusted on both the upper and lower sides, whereby the degree of freedom of the adjustment is increased and the flatness of the resin-molded product can be more finely adjusted. In the present embodiment, adjustment members 141 with a larger cross-sectional area are arranged in the central region, while adjustment members 145 with a smaller cross-sectional area are arranged in the peripheral region. After the adjustment members 141 and 145 have been rearranged, the flatness adjuster 14 is once more loaded in the resin-molding device 10 (
After the flatness adjuster 14 has been fixed, the upper and lower heater plates 151 and 152 are energized. Subsequently, the object to be molded, i.e. the substrate 22 on which the electronic parts 21 are mounted, is attached to a predetermined position on the upper die 161 (
After the substrate 22 has been fastened to the upper die 161, a release film 23 is attached so as to cover the cavity C of the lower die 162. The release film 23 is tightly fitted onto the upper surface and inner wall surface of the side-surface member 1625 as well as the upper surface of the bottom-surface member 1623 with a suction mechanism (not shown) provided in the lower die 162. Subsequently, a predetermined amount of granular or powdery resin material 24 is supplied into the cavity C in which the release film 23 has been fitted (
Next, the toggle link 133 is operated to drive the second platen 12 upward. The lower heater plate 152 and the lower die 162 placed on the second platen 12 are thereby lifted. In this motion, the upper surface of the side-surface member 1625 initially comes in contact with the lower surface of the substrate 22. The second platen 12 and other components in this state are further lifted, whereby the elastic member 1624 is compressed, allowing the bottom-surface member 1623 to move upward in relation to the side-surface member 1625, and the electronic parts 21 mounted on the substrate 22 are immersed in the molten resin 25. In this state, the molding die 16 is clamped (
After the resin-sealed product created by the resin-molding method according to the present embodiment is removed, a circumferential portion of the product is cut off to remove unnecessary portions of the cured resin. If a plurality of electronic parts are collectively sealed with resin as in the previously described example, the product is cut at predetermined positions to obtain the individual parts. That is to say, it is often the case that an intermediate product created by the resin-molding method needs to be further processed to be the completed product. The method for producing a resin-sealed product (resin-molded product) in the present embodiment includes such a process in addition to the processes of the previously described resin-sealing method (resin-molding method).
A method of adjusting the flatness adjuster 14 included in the resin-molding device 10 as a characteristic component in the present embodiment is hereinafter described.
The first platen 11, second platen 12, upper heater plate 151, lower heater plate 152, upper die 161, lower die 162 and other members of the resin-molding device 10 each have a variation in shape at the point of production within their respective tolerances. The variation in the shape of each individual member is small. However, when those members are assembled or attached as parts of the resin-molding device 10, the variations in their respective shapes are accumulated to such an extent that affects the parallelism of the die surfaces in the molding die 16. If the resin-sealing process is performed using the molding die 16 with the parallelism of its die surfaces deteriorated, the flatness of the resin-molded product to be eventually obtained will also be significantly deteriorated. Besides, during the process of clamping the molding die 16, the toggle link 133 applies force to two points (in the example of the present embodiment) on the second platen 12 to drive this platen upward, while the first platen 11, which is immobile, is pulled downward at the portions to which the four tie bars 132 (in the example of the present embodiment) are fixed. That is to say, in each of the first and second platens 11 and 12, an amount of force is locally applied at specific locations, which may also lower the parallelism of the die surfaces in the molding die 16 and thereby deteriorate the flatness of the resin-molded product. In a conventional case, if the first platen 11 is distorted in the die-clamping process, the distortion is directly reflected in the upper die 161 and may possibly deteriorate the flatness of the resin-sealed product. In the present embodiment, even in the case where the upper die 161 is distorted in the die-clamping process, the effect of the variation in its shape can be reduced by appropriately adjusting the arrangement and/or other factors related the adjustment members 141 in the flatness adjuster 14 so as to constantly maintain the flatness of the resin-molding product.
It is difficult to exactly identify all factors that affect the parallelism of the die surfaces in the molding die 16 and the flatness of the resin-molded product, since there are various factors other than the tolerances of the related members as well as the force which acts during the process of clamping the molding die 16 as mentioned earlier; for example, in the heating process using the heater plates, the temperature of each member may slightly vary depending on the location and cause an uneven deformation. However, it is possible to previously investigate the variation in the flatness of the resin-molded product due to such factors, for example, by a preliminary die-clamping test. In the die-clamping test, as shown in
The flatness adjuster 14 in the resin-molding device 10 according to the first embodiment is configured by setting the adjustment members 141 in the adjustment member container 143 in which the adjustment member holder portions 142 are provided. Alternatively, a flatness adjuster 54 as shown in
As shown in
A first flatness adjuster 34A, first upper heater plate 351A, first lower heater plate 352A and first molding die 36A (first upper die 361A and first lower die 362A) are provided between the fixed platen 31 and the upper movable platen 321. Similarly, a second flatness adjuster 34B, second upper heater plate 351B, second lower heater plate 352B and second molding die 36B (second upper die 361B and second lower die 362B) are provided between the upper movable platen 321 and the lower movable platen 322. The first and second molding dies 36A and 36B are located at the same position (die arrangement section) on the plan view. The toggle link 333 is connected to the lower surface of the lower movable platen 322. The upper ends of the tie bars 332 are fixed to the lower surface of the fixed platen 31.
Similarly to the flatness adjuster 14 in the first embodiment, the first and second flatness adjusters 34A and 34B both include adjustment members 341 and an adjustment member container 343. It is naturally possible to use a flatness adjuster 541 which includes bolts 542 and adjustment pins 543 as in the previously described variation. A similar flatness adjuster may also be provided at the lower die of each molding die. As in the first embodiment, the number density (or height, cross-sectional area or rigidity (material)) of the adjustment members 341 in the present embodiment is set so as to maintain the parallelism of the die surfaces of the first and second molding dies 36A and 36B during the die-clamping process in the resin-molding device 30, and thereby make the resin-molded product uniform in flatness.
In the resin-molding device 30 according to the second embodiment, the lower movable platen 322 is driven upward by the toggle link 333, whereby the upper movable platen 321 is also driven upward via the second lower heater plate 352B, second molding die 36B, second upper heater plate 351B and second flatness adjuster 34B. The die-clamping operation is thereby performed in the space between the upper movable platen 321 and the lower movable platen 322 as well as in the space between the upper movable platen 321 and the fixed platen 31. In this manner, the device in the present embodiment can simultaneously clamp the two molding dies by a single operation of the toggle link 333, whereby the production efficiency of the resin-molded products is improved. In the present resin-molding device 30, the lower movable platen 322, second molding die 36B, upper movable platen 321 and other related members are sequentially driven upward by the operation of the toggle link 333. As a different configuration, the upper and lower movable platens 321 and 322 may be linked with each other through a linkage mechanism including a rack-and-pinion system (or the like) so that the upper and lower movable platens 321 and 322 move in an interlocked manner, e.g. so that the moving distance of the lower movable platen 322 becomes two times the moving distance of the upper movable platen 321 (for example, see Patent Literature 3).
The resin-molding system 40 includes a plurality of molding modules 41, one resin-material-and-substrate refilling module 42, one resin-molded-product unloading module 43, and a transfer mechanism 44 penetrating through those modules. The resin-molding system 40 further includes: a resin-material-and-substrate supply device 45 which can be transferred between the resin-material-and-substrate refilling module 42 and the plurality of molding modules 41 by the transfer mechanism 44; and a resin-molded-product unloading device 46 which can be transferred between the plurality of molding modules 41 and the resin-molded-product unloading module 43 by the transfer mechanism 44. These components will be hereinafter described.
Each molding module 41 corresponds to one resin-molding device 10 in the first embodiment and additionally includes an auxiliary transfer mechanism 411 for transferring the resin-material-and-substrate supply device 45 and the resin-molded-product unloading device 46 between the transfer mechanism 44 and the resin-molding device 10.
The resin-material-and-substrate supply device 45, with a substrate 22 contained in its upper section and a resin material 24 (e.g. in a granular or powdery form) in its lower section, is transferred to a position near the resin-molding device 10 by the transfer mechanism 44 and the auxiliary transfer mechanism 411. Then, the device supplies the resin material 24 into the cavity C of the resin-molding device 10, and the substrate 22 into the upper die 161. For example, a device having a construction similar to the resin supply device described in Patent Literature 2 can be used as the device for supplying the resin material 24 into the cavity C. As for the device for supplying the substrate 22 into the upper die 161, a commonly known manipulator can be used. The resin-material-and-substrate refilling module 42 includes: a resin-material refilling device 421 having a hopper for refilling the resin-material-and-substrate supply device 45 with the resin material 24; and a substrate storage unit (magazine) 422 for storing the substrates 22 to be used for refilling the resin-material-and-substrate supply device 45. It is not always necessary to perform the supply of the substrate 22 and the resin material 24 through a single device; they can be supplied by using different devices. As already explained in the first embodiment, a configuration for simultaneously supplying the release film 23 and the resin material 24 into the cavity C may also be adopted.
The resin-molded-product unloading device 46 is transferred to a position near the resin-molding device 10 by the transfer mechanism 44 and the auxiliary transfer mechanism 411. Subsequently, by using the manipulator, the device removes the resin-molded product which includes the electronic parts 21 mounted on the substrate 22 and sealed with the cured resin 26, from the upper die 161 of the resin-molding device 10. The removed product is transferred to the resin-molded-product unloading module 43 by the auxiliary transfer mechanism 411 and the transfer mechanism 44. The resin-molded-product unloading module 43 includes a resin-molded-product storage unit (magazine) 431 for storing the resin-molded products which have been unloaded.
The molding modules 41 can be attached to and detached from each other in the direction in which the resin-material-and-substrate supply device 45 is transferred by the transfer mechanism 44 (the lateral direction in
With the resin-molding system 40 according to the present embodiment, after the process of supplying the resin material 24 into the cavity C and attaching the substrate 22 to the upper die 161 has been completed in one molding module 41, the supply of the resin material 24 and the attachment of the substrate 22 in another molding module 41 can be performed while the die-clamping process is being performed in the former molding module 41. This allows multiple tasks to be simultaneously performed in parallel in the plurality of molding modules 41 and thereby improves the production efficiency of the resin-molded products. The number of molding modules 41 can be freely increased or decreased as needed in the process of manufacturing the resin-molding system 40 or after the completion of the resin-molding system 40.
The resin-material-and-substrate refilling module 42 and the resin-molded-product unloading module 43 in the previously described resin-molding system 40 are provided as separate modules. However, the two modules may be integrated into a single module. That is to say, the resin-material refilling device 421, substrate storage unit 422 and resin-molded-product storage unit 431 may be included in a single module. Additionally, the resin-material-and-substrate refilling module 42 may also be provided with one resin-molding device 10 of the first embodiment. It is also possible to integrate the resin-material-and-substrate supply device 45 and the resin-molded-product unloading device 46 into a single device by using the same manipulator for both the supply of the substrate and the unloading of the resin-molded product.
Any of the previous embodiments is a mere example and can be appropriately changed within the spirit of the present invention.
Although any of the previously described embodiments is concerned with the case of the compression molding, the flatness adjuster and other members can similarly be applied in the case of performing the resin molding by a different method, such as the transfer molding.
The method for producing a resin-molded product according to the first embodiment includes the process of cutting the resin-molded product in addition to the processes of the resin-molding method. However, the method for producing a resin-molded product according to the present invention is not limited to such a case. For example, an additional process may also be included along with the process for molding a resin (e.g. compression-molding process) by the resin-molding method according to the present invention, or there may be no such additional process included. The additional process may be different from the cutting process mentioned earlier.
The previously described embodiments have been concerned with the case where the resin-sealed surface (molded surface) of the resin-molded product will be flat when the die surfaces of the upper and lower dies are parallel to each other. Depending on the properties of the resin used for the resin molding, the operation of clamping the molding die with the die surfaces of the upper and lower dies being parallel to each other may cause the resin-molded surface of the resin-molded product to be warped after the die is opened. In such a case, the warpage should be taken into account in adjusting the arrangement and/or other factors related to the adjustment members in the flatness adjuster.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2017-033888 | Feb 2017 | JP | national |
