Resin sealing mold

Abstract

To provide a resin sealing mold capable of suppressing an occurrence of resin burrs.SOLUTION: A resin sealing mold according to one aspect of the present invention, which performs resin sealing of a molded product so as to form an exposed surface where a part of the molded product is not covered with resin and is exposed includes a cavity forming part in which the molded product is placed and the resin flows. A recess is formed in a portion of the cavity forming part, the recess having a contact part against which an outer peripheral edge part, which becomes an outer periphery of the exposed surface when a mold is clamped, is pressed over an entire circumference.SELECTED DRAWING: Figure 10

Description

[Technical field]

[0001] The disclosed embodiment relates to a resin-sealed mold. [Background technology]

[0002] Conventionally, there has been known a resin sealing die for sealing a molded article with resin. For example, there has been known a resin sealing die for producing a molded article by sealing a molded article with resin so as to form an exposed surface where a part of the molded article is exposed and not covered with resin.

[0003] Patent Document 1 discloses a technology in which a pressure-applying member is pressed against a molded product, which is the object to be sealed, to prevent resin from entering the portion of the molded product that comes into contact with the pressure-applying member and expose that portion. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2017-011192 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the technology described in Patent Document 1, a part of the molded workpiece and the pressure applying member are in surface contact with each other, so if the molded workpiece is tilted, for example, a gap is formed between the molded workpiece and the pressure applying member, which causes a problem that resin gets into the gap between the molded workpiece and the pressure applying member, resulting in resin burrs.

[0006] One aspect of an embodiment has been made in consideration of the above, and aims to provide a resin-sealed mold that can suppress the occurrence of resin burrs. [Means for solving the problem]

[0007] A resin sealing mold according to one aspect of the embodiment is a resin sealing mold that seals a molded product with resin so as to form an exposed surface in which a portion of the molded product is exposed and not covered by resin, and has a cavity forming portion that forms a cavity into which the molded product is placed and into which resin flows, and a recess is formed in part of the cavity forming portion that has an abutment portion against which the outer periphery, which becomes the outer periphery of the exposed surface when the mold is closed, is pressed all around. Effect of the Invention

[0008] According to one aspect of the embodiment, the occurrence of resin burrs can be suppressed. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view showing an example of the configuration of a resin sealing apparatus according to an embodiment. [Diagram 2] FIG. 2 is a side view showing an example of the configuration of a workpiece according to the embodiment. [Diagram 3] FIG. 3 is a bottom view showing an example of the configuration of the molding workpiece according to the embodiment. [Figure 4] FIG. 4 is a side view showing an example of the configuration of a sleeve terminal according to an embodiment. [Diagram 5] FIG. 5 is a bottom view showing an example of the configuration of the sleeve terminal according to the embodiment. [Figure 6] FIG. 6 is a cross-sectional view showing an example of a resin sealing apparatus according to an embodiment. [Figure 7] FIG. 7 is an enlarged view of region VII shown in FIG. [Figure 8] FIG. 8 is a plan view showing an example of the insert according to the embodiment. [Figure 9] FIG. 9 is a diagram (part 1) showing an example of a resin sealing process using a resin sealing die according to the embodiment. [Figure 10] FIG. 10 is an enlarged view showing an example of the region X shown in FIG. [Figure 11] FIG. 11 is an enlarged view showing an example of the region XI shown in FIG. [Figure 12]FIG. 12 is a plan view showing an example of a contact portion included in the inclined portion of the insert according to the embodiment. [Figure 13] FIG. 13 is a diagram (part 2) showing an example of a resin sealing process using a resin sealing die according to the embodiment. [Figure 14] FIG. 14 is an enlarged view showing an example of the region XIV shown in FIG. [Figure 15] FIG. 15 is an enlarged view corresponding to FIG. 14, showing an example of a resin sealing step using a resin sealing die according to the embodiment (part 3). [Figure 16] FIG. 16 is an enlarged view showing an example of the region XVI shown in FIG. [Figure 17] FIG. 17 is a side view showing an example of the configuration of the molded product according to the embodiment. [Figure 18] FIG. 18 is a bottom view showing an example of the configuration of the molded product according to the embodiment. [Figure 19] FIG. 19 is an enlarged view corresponding to FIG. 10, showing another example of the recess of the insert according to the embodiment. [Figure 20] FIG. 20 is an enlarged view of the area XX shown in FIG. [Figure 21] FIG. 21 is a plan view showing another example of the insert according to the embodiment. [Figure 22] FIG. 22 is an enlarged view corresponding to FIG. 16, showing another example of the recess of the insert according to the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of a resin-sealed mold disclosed in the present application will be described in detail with reference to the accompanying drawings. Note that the present invention is not limited to the embodiment described below.

[0011] <1. Resin sealing equipment configuration> 1, the resin sealing apparatus 100 according to the first embodiment includes a resin sealing mold 1, a plurality of tie bars 4, a fixed platen 5, a movable platen 6, and a transfer unit 7. In order to facilitate understanding of the positional relationship, each axis of an XYZ coordinate system including an X-axis, a Y-axis, and a Z-axis that are orthogonal to each other is shown in several drawings including FIG. 1, and the Z-axis is the up-down direction.

[0012] The multiple tie bars 4 extend parallel to one another in the vertical direction and are supported by a base (not shown). A fixed platen 5 is fixed to the upper end of each tie bar 4, and a movable platen 6 is attached to each tie bar 4 so as to be movable in the vertical direction (Z-axis direction).

[0013] The resin sealing mold 1 includes an upper mold 2 and a lower mold 3. The upper mold 2 is attached to a fixed platen 5, and the lower mold 3 is attached to a movable platen 6. The movable platen 6 is driven by a driving mechanism (not shown) to move in the vertical direction. The upper mold 2 includes an upper chess piece 10 and an upper die set 20 that supports the upper chess piece 10. The lower mold 3 includes a lower chess piece 30 and a lower die set 40 that supports the lower chess piece 30.

[0014] In the resin sealing apparatus 100, the movable platen 6 moves upward, whereby the lower mold 3 comes into contact with the upper mold 2, and the upper mold 2 and the lower mold 3 are clamped together. In the example shown in Fig. 1, the resin sealing apparatus 100 is configured so that the lower mold 3 moves upward (positive direction of the Z axis), but it may also be configured so that the upper mold 2 moves downward (negative direction of the Z axis), or so that the lower mold 3 moves upward and the upper mold 2 moves downward.

[0015] In the resin sealing apparatus 100, the upper mold 2 and the lower mold 3 come into contact with each other and are clamped together to form a resin supply path (e.g., a cull portion and a runner portion, etc.) and a cavity 50 (see Figure 13) in the space between the upper mold 2 and the lower mold 3, and the molded product 60 is resin sealed within the cavity 50 (see Figure 13).

[0016] 1 is configured to resin-seal six molded articles 60, but is not limited to this example, and the number of molded articles 60 that can be resin-sealed simultaneously may be five or less, or seven or more. In addition, in the resin sealing apparatus 100 shown in FIG. 1, six pots 8 in which resin tablets are respectively placed are used to resin-seal six molded articles 60, but is not limited to this example, and the number of pots 8 may be five or less, or seven or more.

[0017] 2 and 3, the molded product 60 includes a lead frame 61 and a plurality of sleeve terminals 62. Each sleeve terminal 62 is formed in a cylindrical shape and is inserted into a corresponding one of a plurality of insertion holes 611 formed in the lead frame 61.

[0018] For example, a press-fit terminal (not shown) or the like is inserted into each sleeve terminal 62 after the resin molding of the molded product 60 by the resin sealing apparatus 100. Each sleeve terminal 62 is, for example, a metal terminal and is also called a pin holder. The molded product 60 includes, for example, an electric component such as a semiconductor element (not shown), but is not limited to this example.

[0019] 4 and 5, each sleeve terminal 62 has a main body 63 with a cavity 631 inside, and an annular flange 64 having an outer diameter larger than that of the main body 63. The above-mentioned press-fit terminal (not shown) or the like is inserted into the cavity 631 of the main body 63 through an opening 641 of the flange 64.

[0020] The resin sealing mold 1 of the resin sealing apparatus 100 seals the molded product 60 with resin so as to form an exposed surface where a portion of the molded product 60 is exposed and not covered with resin, to produce a molded product 70 (see Figures 17 and 18) which will be described later.

[0021] 3, a surface 642 of the flange 64 of each sleeve terminal 62 is formed as an exposed surface during resin sealing by the resin sealing die 1. The surface 642 of the annular flange 64 is a flat surface, but is not limited to this example.

[0022] The configuration of the resin sealing die 1 of the resin sealing apparatus 100 and the resin sealing process of resin sealing the molded product 60 with the resin sealing die 1 of the resin sealing apparatus 100 will be described in detail below.

[0023] <2. Configuration of resin sealing mold 1> 6, in the resin sealing mold 1 of the resin sealing apparatus 100, an upper mold 2 including an upper die chest 10 and a lower mold 3 including a lower die chest 30 are positioned apart from each other in the mold clamping direction (Z-axis direction). In the resin sealing process of the molded product 60, the lower mold 3 is moved in a direction toward the upper mold 2 (positive direction of the Z-axis) and is brought into a mold clamping state in which it abuts against the upper mold 2.

[0024] The upper die chess 10 of the upper die 2 includes a cavity forming portion 11 that forms part of the cavity 50 (see FIG. 13), a runner forming portion (not shown) that forms part of the runner portion (not shown), and a part of the cull forming portion (not shown) that forms the cull portion (not shown). Each of the cavity 50 (see FIG. 13), the cull portion (not shown), and the runner portion (not shown) is a space that is formed by clamping the upper die 2 and the lower die 3 together.

[0025] The lower die chess 30 of the lower die 3 includes a cavity forming portion 31 that forms part of the cavity 50 (see Figure 13), a runner forming portion (not shown) that forms a runner portion (not shown), and a cull forming portion (not shown) that forms a cull portion (not shown).

[0026] The lower chess set 30 includes a plurality of lower chess set body parts 32, a plurality of nesting pieces 33 each movable relative to a corresponding one of the plurality of lower chess set body parts 32, and a plurality of support members 34 each supporting a corresponding one of the plurality of nesting pieces 33.

[0027] The support member 34 is, for example, an elastic member such as a spring, but may be, for example, a hydraulic member, etc., as long as it can hold the insert 33 so as to be movable in the opposite direction to the mold clamping direction (Z-axis negative direction) during mold clamping. The mold clamping direction is the direction in which the upper mold 2 and the lower mold 3 approach each other relatively.

[0028] 7, the lower chess piece main body 32 includes a cavity forming portion 32a forming a part of the cavity forming portion 31, and a plurality of insertion holes 32b through which corresponding ones of the plurality of nesting members 33 are inserted. The lower chess piece main body 32 also includes the above-mentioned runner forming portion and cull forming portion (not shown).

[0029] Each of the inserts 33 is inserted into a corresponding one of the multiple insertion holes 32b in the lower chess piece body 32. The upper surface 35 of the insert 33 shown in FIG. 7 forms a part of the cavity forming portion 31, and has a recess 36 and a flat portion 37 surrounding the recess 36.

[0030] 7, the recess 36 has an annular inclined portion 362 that surrounds a central portion 361 of the recess 36 and is inclined toward the central portion 361 of the recess 36. The inclined portion 362 of the recess 36 is formed with an arc-shaped inclination.

[0031] 7 has a shape that is rotationally symmetrical about central portion 361 and is formed into a shape having a spherical curved surface, but as long as the inclination is formed in an arc, it is not limited to the shape shown in Fig. 7. For example, the arc-shaped inclination may be an inclination in which the inclination angle gradually decreases toward central portion 361, or an inclination in which the inclination angle gradually increases toward central portion 361.

[0032] <3. Resin sealing process by resin sealing apparatus 100> When the resin sealing mold 1 is in the state shown in Fig. 7, each molded article 60 is placed between the upper mold 2 and the lower mold 3 by a conveying device (not shown). In the example shown in Fig. 9, each molded article 60 is placed between the upper mold 2 and the lower mold 3, on the lower die chest 30 of the lower mold 3.

[0033] When the upper mold 2 and the lower mold 3 are clamped together, each of the flanges 64 of the multiple sleeve terminals 62 in each molded product 60 is positioned on a recess 36 formed on the upper surface 35 of a corresponding one of the multiple nests 33, as shown in Figure 10.

[0034] 10 and 11, the inclined portion 362 of the recess 36 has an abutting portion 362a against which the outer peripheral edge portion 642a of the surface 642 of the flange 64 of the sleeve terminal 62 is pressed. The outer peripheral edge portion 642a has an annular shape, the inclined portion 362 of the recess 36 has an outer diameter larger than that of the outer peripheral edge portion 642a, and the inclined portion 362 of the recess 36 is formed with an arc-shaped inclination as described above. Since the abutting portion 362a is a part of the inclined portion 362, it has an arc-shaped inclination.

[0035] Therefore, even if a positional shift occurs along the XY plane when the upper chest piece 10 and the lower chest piece 30 are clamped, as shown in FIG. 12, the inclined portion 362 of the recess 36 can ensure that the area against which the outer peripheral edge portion 642a is pressed can be provided as the abutment portion 362a.

[0036] Thereafter, the movable platen 6 (see FIG. 1) moves upward (positive direction of the Z axis), causing the lower die 3 to move upward (positive direction of the Z axis) toward the upper die 2. When the lower die 3 moves upward (positive direction of the Z axis), the upper die 2 and the lower die 3 are clamped together, and the molded product 60 is sandwiched between the upper die chess 10 of the upper die 2 and the lower die chess 30 of the lower die 3, as shown in FIG.

[0037] When the upper mold 2 and the lower mold 3 are clamped together, the outer peripheral edge 642a of the surface 642 of the flange 64 of the sleeve terminal 62 is pressed against the inclined portion 362 of the recess 36 of the insert 33, and a part of the outer peripheral edge 642a is crushed and deformed. Therefore, even if there is variation in the flatness or surface density of the surface 642 of the flange 64, the outer peripheral edge 642a will be in close contact with the inclined portion 362 of the recess 36 of the insert 33 over the entire circumference.

[0038] Furthermore, a cavity 50 is formed by clamping the upper mold 2 and the lower mold 3 together, and a molded product 60 is placed in the cavity 50. After that, a resin tablet placed in a pot 8 (see FIG. 1) melts, and as shown in FIG. 15, the molten resin 9 fills the cavity 50 via a cull portion and a runner portion (not shown).

[0039] At this time, as described above, the outer peripheral edge portion 642a of the surface 642 of the flange 64 of the sleeve terminal 62 is in close contact with the inclined portion 362 of the recess 36 of the insert 33, so that the intrusion of the resin 9 from the outer peripheral edge portion 642a of the surface 642 of the flange 64 to the portion inward therefrom is suppressed, as shown in FIG. 16 .

[0040] Therefore, an exposed surface is formed on surface 642 of flange 64 of sleeve terminal 62 from outer peripheral edge 642a to its inner portion, and the occurrence of resin burrs on surface 642 of flange 64 of sleeve terminal 62 is suppressed.

[0041] Thereafter, in the resin sealing apparatus 100, the movable platen 6 (see FIG. 1) moves downward (negative Z-axis direction), thereby moving the lower mold 3 downward (negative Z-axis direction). This releases the clamping between the upper mold 2 and the lower mold 3. Then, the molded product 70 (see FIGS. 17 and 18) is removed from the resin sealing mold 1 by a conveying device (not shown).

[0042] 17 and 18, in the molded product 70, a portion of each of the lead frame 61 and the plurality of sleeve terminals 62 is resin-sealed, and a portion of each of the lead frame 61 and the plurality of sleeve terminals 62 is covered with molded resin 71. The molded resin 71 is formed by filling the cavity 50 with the molten resin 9 as described above.

[0043] The molded resin 71 is formed with a plurality of insertion holes 711 each reaching the flange 64 of a corresponding one of the plurality of sleeve terminals 62. After the molded product 70 is incorporated into an apparatus (not shown) or the like, a press-fit terminal (not shown) is inserted into the insertion hole 711. The press-fit terminal (not shown) inserted into the insertion hole 711 is inserted into the insertion hole 611 via an opening 641 in the sleeve terminal 62.

[0044] In the recess 36 in the above-described insert 33, the annular inclined portion 362 has an inclination formed in an arc shape, and therefore the abutting portion 362a has an arc-shaped inclination. However, the annular inclined portion 362 is not limited to this, and as shown in Figs. 19 to 21, the inclination may be formed in a straight line, and the abutting portion 362a may also have a straight line inclination.

[0045] The linear inclination has a constant inclination angle, but is not limited to an inclination having a strictly constant inclination angle, and may have any inclination that allows the outer peripheral edge portion 642a to come into close contact over the entire circumference. The recess 36 shown in Figures 19 to 21 is a truncated cone-shaped recess, and the inclined portion 362 has a shape that is rotationally symmetrical about the central portion 361.

[0046] 19 to 21 forms a part of the cavity forming portion 31, and has a recess 36 and a flat portion 37 surrounding the recess 36. As shown in Fig. 20, the recess 36 has a flat portion 363 including a central portion 361 of the recess 36, and an annular inclined portion 362 surrounding the flat portion 363 and inclined toward the central portion 361 of the recess 36. The inclined portion 362 of the recess 36 is formed so that the inclination is linear.

[0047] When the upper mold 2 and the lower mold 3 are clamped together, the outer peripheral edge 642a of the surface 642 of the flange 64 of the sleeve terminal 62 is pressed against the inclined portion 362 of the recess 36 of the insert 33, and a part of the outer peripheral edge 642a is crushed and deformed. Therefore, even if there is variation in the flatness or surface density of the surface 642 of the flange 64, the outer peripheral edge 642a comes into close contact with the inclined portion 362 of the recess 36 of the insert 33 over the entire circumference.

[0048] Therefore, even if a positional shift occurs along the XY plane when the upper chest piece 10 and the lower chest piece 30 are clamped, as shown in FIG. 21, the inclined portion 362 of the recess 36 can ensure that the area against which the outer peripheral edge portion 642a is pressed around its entire circumference serves as the abutment portion 362a.

[0049] 19 and 20, the molten resin 9 is filled into the cavity 50 via the cull portion and the runner portion (not shown). In this case, since the outer peripheral edge portion 642a of the surface 642 of the flange 64 of the sleeve terminal 62 is in close contact with the inclined portion 362 of the recess 36 of the insert 33 as described above, the resin 9 is prevented from entering the outer peripheral edge portion 642a of the surface 642 of the flange 64 to the portion inward therefrom as shown in FIG.

[0050] Therefore, an exposed surface is formed on surface 642 of flange 64 of sleeve terminal 62 from outer peripheral edge 642a to its inner portion, and the occurrence of resin burrs on surface 642 of flange 64 of sleeve terminal 62 is suppressed.

[0051] In the above-mentioned example, the support member 34 is, for example, an elastic member such as a spring or a hydraulic member, but is not limited to such an example as long as it can support the insert 33. Also, the lower chess set 30 has a lower chess set main body 32 and the insert 33, but the lower chess set main body 32 and the insert 33 may be integrally formed.

[0052] In the above-mentioned example, the outer peripheral edge portion 642a is formed in an annular shape, and the inclined portion 362 has a shape that is rotationally symmetrical about the central portion 361, but as long as the outer peripheral edge portion 642a is configured to be pressed against the abutment portion 362a over the entire circumference, the shapes of the outer peripheral edge portion 642a and the inclined portion 362 are not limited to the above-mentioned example. For example, when the outer peripheral edge portion 642a is formed in a polygon (e.g., a regular polygon), the inclined portion 362 may have the shape of an inclined portion of a recess of a truncated polygonal pyramid (e.g., a truncated regular polygonal pyramid).

[0053] As described above, the resin sealing mold 1 according to the embodiment is a resin sealing mold that resin seals the molded product 60 so as to form an exposed surface where a part of the molded product 60 is exposed without being covered with resin, and has a cavity forming part 31 that forms a cavity 50 where the molded product 60 is placed and into which the resin flows, and a recess 36 having a contact part 362a against which an outer peripheral edge part 642a that becomes the outer periphery of the exposed surface when the mold is closed is pressed over the entire circumference is formed in the cavity forming part 31. As a result, the resin sealing mold 1 can suppress the occurrence of resin burrs in the part that becomes the exposed surface of the molded product 60.

[0054] Moreover, the recess 36 has an annular inclined portion 362 that surrounds the center portion of the recess 36 and inclines toward the center portion of the recess 36, and the abutment portion 362a is formed on the annular inclined portion 362. As a result, even if a positional deviation occurs along the XY plane when the upper die chest 10 and the lower die chest 30 are clamped, the resin sealing mold 1 can secure an area where the outer peripheral edge portion 642a is pressed over the entire circumference as the abutment portion 362a.

[0055] Moreover, the inclined portion 362 is formed to have an arc-shaped incline. This makes it possible for the resin-sealing mold 1 to suppress the occurrence of resin burrs in the portion of the molded product 60 that becomes the exposed surface.

[0056] Moreover, the inclined portion 362 is formed so that the inclination is linear. This makes it possible for the resin-sealing mold 1 to suppress the occurrence of resin burrs in the portion that becomes the exposed surface of the molded product 60.

[0057] In addition, the insert 33 forms a part of the cavity forming part 31 including the recess 36 and is movable in the opposite direction to the mold clamping direction during mold clamping. This makes it possible for the resin sealing mold 1 to prevent excessive force from being applied to the exposed surface of the molded product 60 during mold clamping.

[0058] Further advantages and modifications may readily occur to those skilled in the art. Thus, the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and equivalents thereof. [Explanation of symbols]

[0059] 1 Resin sealing mold 2 Upper mold 3 Lower mold 4 Tie Bar 5 Fixed Platen 6 Movable Platen 7 Transfer Unit 8 Pot 9. Resin 10 Upper Chess 11, 31, 32a Cavity forming part 20 Upper die set 30 Lower Chess 32 Lower chess body 32b,611 Insertion hole 34 Support member 35 Top 36 Recess 37,363 flat area 40 Lower die set 50 Cavity 60 Molded product 61 Lead Frame 62 Sleeve terminal 63 Main body 64 Tsuba 70 Molded products 71 Molding resin 100 Resin sealing equipment 361 Center part 362 Slope 362a Contact part 631 Cavity 641 Aperture 642 Surface 642a Outer periphery 711 Insertion hole

Claims

1. A resin sealing die for sealing a molded product with resin so as to form an exposed surface where a part of the molded product is exposed without being covered with resin, a cavity forming portion that forms a cavity into which the molded product is placed and into which the resin flows; A part of the cavity forming portion has A recess is formed having a contact portion against which the outer peripheral edge portion that becomes the outer periphery of the exposed surface is pressed over the entire circumference when the mold is closed. A resin-encapsulated mold.

2. The recessed portion is a ring-shaped inclined portion surrounding the central portion of the recess and inclined toward the central portion of the recess; The abutment portion is The annular inclined portion is formed 2. The resin sealing mold according to claim 1.

3. The inclined portion is The slope is formed in an arc shape.

3. The resin sealing mold according to claim 2.

4. The inclined portion is The gradient is linear 3. The resin sealing mold according to claim 2.

5. a nest that forms a part of the cavity forming portion including the recess and is movable in a direction opposite to the mold clamping direction during the mold clamping; 3. The resin-sealing mold according to claim 1 or 2.

Images