JP3254993B2 - Mold structure of insert molded body of thin board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manufacturing method and a mold structure for manufacturing an insert molding of a thin substrate by injection molding.

[0002]

2. Description of the Related Art FIG. 34 is a sectional view showing a conventional insert molded body, and FIG. 35 is a sectional view showing a mold structure for molding the conventional insert molded body. In the figure, 101 is a lower mold having a desired shape, 102 is an upper mold for forming a desired shape by applying a pressing pressure to a resin so as to conform to the shape of the lower mold 101, and 103 is positioning and fixing a thin substrate. Guide pins 104 for performing insert molding, 106,
Reference numeral 107 denotes one outer cover and the other outer cover formed by dividing the insert molded body 104 into two parts in the plate thickness direction and molding them by a thermoplastic resin. In addition, this type of thin substrate insert molded body 104 is manufactured by hot press molding.

Next, the operation will be described with reference to the drawings. The jackets 106 and 107 are formed in advance into a shape for forming the insert molded body 104 by hot press molding or press punching of a resin sheet. And the envelopes 106, 10
7 is slightly larger than the size required to form the insert molded body 104 into a desired shape. After such preparation, the outer mold 106, the thin substrate 1
08, so that the guide pins 10
Insert through 3. The lower mold 101 and the upper mold 102
The heating is performed to a temperature at which the outer cover 106 and the outer cover 107 are melted. When the upper mold 102 is pressurized, the heating temperature is rapidly transmitted to the outer cover 106 and the outer cover 107 and re-melted. It flows into the desired mold shape under pressure and adheres to the mold. After that, it cools and solidifies to completion.

[0004] Here, as an example of a method of forming the insert molded body 104, a molding method using a hot press has been described. However, there is another method using an injection molding machine. In this method, the thin substrate 1 is placed via positioning pins or the like. In order to pour the resin into the gap between the upper and lower molds of the thin substrate 108, there is no problem if the resin is filled in a well-balanced manner at the same time. When the resin excessively flows into the mold, the thin substrate 108 is pushed by the resin in the opposite direction, and it becomes very difficult to hold the thin substrate 108 at the center of the insert molded body in the thickness direction.

[0005]

Since the conventional method of manufacturing the insert molded body 104 of a thin substrate and the mold structure have been described above, the conventional manufacturing method and mold structure have the following problems. Had. Forming by hot pressing requires the jacket 106 and the jacket 107, which are intermediate products sandwiching the thin substrate 108, and requires man-hours to manufacture the intermediate products. In the molding by hot pressing, the jackets 106 and 107 are inserted into the insert molded body 104.
It is necessary to mold the resin slightly larger than necessary to form it into the desired shape, to protrude the resin from the product by pressurization, and to completely fill it.Therefore, it is necessary to finish the protruded resin with a knife or the like. Was. In molding by hot pressing, it is necessary to heat the mold to the melting temperature of the resin at the time of molding, and a large amount of time is required for heating.
In molding by an injection molding machine, it is very difficult to hold the thin substrate 108 at the center of the insert molded body in the thickness direction, and it is difficult to mold the outer casings 106 and 107 to a uniform thickness.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has improved the productivity of an insert molded product of a thin substrate formed by injection molding, and is inexpensive and stable in quality. It is an object of the present invention to obtain an insert molded article.

[0007]

[Means for Solving the Problems]

According to the present invention, there is provided a mold structure for an insert molded body of a thin substrate, wherein a mold-side positioning portion for positioning the thin substrate by engaging with a substrate-side positioning portion provided on the thin substrate is provided. An insert having a carved portion formed in a predetermined shape on a surface opposite to one surface of the thin substrate and having a gate for conducting resin, a first pocket and a second pocket for holding the insert. And a runner for supplying the injected resin by engaging with the nested gate held in the first and second pockets.
And a closing surface for closing the other surface of the thin substrate positioned on the nest held by the first pocket by being mounted on the first forming die. And a second mold having an engraved portion engraved in a predetermined shape opposite to the other surface of the thin substrate positioned on the nest held by the second pocket. It is.

Further, in the mold structure of the insert molded body of the thin substrate according to the present invention, the nested gate is such that the resin injected from the gate presses the end of the thin substrate toward the closed surface side. It is provided as follows.

In the mold structure of the insert molding of a thin substrate according to the next invention, the closing surface of the second molding die is provided with a groove near the outer periphery of the thin substrate to be closed.

A mold structure for an insert molded body of a thin substrate according to the next invention is provided so as to be slidable at a gate opening of a nest held by a second molding die, and is provided with a runner and a gate. A gate cutting block having an opening for engaging with the gate and conducting the resin, and a block sliding means for sliding the gate cutting block.

In the mold structure of the insert molding of a thin substrate according to the next invention, the block sliding portion slides the gate cutting block in conjunction with the opening of the first and second molding dies. It is to let.

Further, the mold structure of the insert molding of the thin substrate according to the next invention is provided with a temperature adjusting means for keeping the second molding die at the thermal deformation temperature of the injected resin.

Further, the manufacturing method of the insert molding of the thin substrate according to another aspect of the present invention are those having a temperature adjustment step to keep the temperature of the second mold to heat deformation temperature of the injected resin.

Further, according to the present invention, there is provided a mold structure for an insert molded body of a thin substrate, wherein a mold-side positioning portion for positioning the thin substrate by engaging with a substrate-side positioning portion provided on the thin substrate is provided. A nested part provided with a gate for conducting resin in a carved portion carved in a predetermined shape on a surface opposite to one surface of the positioned thin substrate, and a pocket for holding the nested part is provided. A first molding die provided with a runner for supplying the injected resin by engaging with the nested gate held in the first molding die, and insert molding the thin-walled substrate by mounting the first molding die on the first molding die. A second forming die having a forming part for forming a body, and an engaging position moving means for moving an engaging position of the first and second forming dies from the first engaging position to the second engaging position. And the molding portion is provided at the first engagement position. A closing surface that closes the other surface of the thin substrate positioned on the nest held by the pocket, and the second positioning position positioned on the nest held by the pocket at the second engagement position. It has a carved portion carved in a predetermined shape facing the other surface of the thin substrate.

Further, the mold structure of the insert molding of a thin substrate according to the next invention detects that the first and second molding dies have moved from the first engagement position to the second engagement position. It is provided with a movement detecting means.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, a method for manufacturing an insert molded body of a thin substrate according to an embodiment of the present invention will be described. FIG. 1 is a structural view showing an insert molded product of a thin substrate formed by the method for producing an insert molded product of a thin substrate according to the present invention. FIG. 1 (a) is a plan view and FIG. 1 (b) is a side view. Show.
1 is a thin substrate, 2 is a thermoplastic elastomer resin surrounding the thin substrate 1, and 2a is a lower side of the thermoplastic elastomer resin obtained by dividing the thermoplastic elastomer resin 2 in a thickness direction (hereinafter, referred to as a lower resin). Reference numeral 2b denotes an upper side of the thermoplastic elastomer resin (hereinafter, referred to as an upper side resin). 3
Is an insert molded body of a thin substrate in which a thin substrate 1 is incorporated and an outer shape is formed to a desired shape by a thermoplastic elastomer resin 2. Reference numeral 15a denotes a positioning hole which is a substrate-side positioning portion formed in the thin substrate 1.

The thermoplastic elastomer resin 2 constituting the insert molding 3 of the thin substrate according to the present invention has dielectric and mechanical properties so as to enclose the 0.3 mm thin substrate 1 provided with the electronic circuit pattern. , For example, using a resin blended with a polypropylene resin and a thermoplastic olefin-based elastomer resin. In particular, the purpose of coating with a uniform thickness is used as a high-frequency antenna for mobile phones, wireless devices, and the like, and is an important factor for obtaining excellent gain performance.

Next, the insert molding 3 of this thin substrate
The method for manufacturing the will be described. FIG. 2A is a plan view showing a state in which the thin substrate 1 is mounted on the lower mold 1a.
(B) is a side view showing the relationship between the thin substrate 1, the lower mold 1a, and the upper mold 1b. As described above, the lower resin 2
In order to cover the thin substrate 1 to a uniform thickness with the upper resin 2a and the upper resin 2b, the thin substrate 1 is positioned on the lower mold 4a in which the lower shape is cut into two as shown in FIG. Positioning hole 15a in the stepped positioning pin 15
Is inserted and set, and the upper direction of the thin substrate 1 is the thin substrate 1
Upper mold 4 having a closed surface which is a flat surface for closing
b, and in a first injection step, the lower engraved portion of the lower mold 4a is filled with resin by primary injection, and the lower resin 2a shown in FIGS. It is molded to obtain a semi-molded body in which the upper surface of the thin substrate 1 is not yet wrapped.

Next, in a second injection step, the upper mold 4b is removed, and as shown in FIG. A second injection is performed into the engraved portion having the upper shape of the upper mold 5 and the resin is filled therein.
Form b. At this time, after the primary injection molded part is re-melted by the plasticization temperature of the secondary injection resin, the lower resin 2a as the primary injection molded part and the upper resin 2b as the secondary injection molded part are melted.
Are joined to obtain an insert molded body 3 of a thin substrate having a desired shape.

In the conventional method using an injection molding machine, the thin substrate 1 is temporarily placed at a desired position via positioning pins and the like, and the resin is poured into gaps between upper and lower molds of the thin substrate 1 at this time. There is no problem if the resin is filled up and down at the same time in a well-balanced manner. It is very difficult to hold the thin substrate 1 at the center of the insert molded body in the thickness direction.

In the first embodiment, the lower resin 2a forming the upper surface of the thin substrate 1 and the upper resin 2b forming the lower surface
Is formed one by one so that the thin substrate 1 is held at the center of the insert molded body 3 of the thin substrate by the injection molding method.

Embodiment 2 FIG. In the first embodiment, the method of manufacturing the insert molded body 3 of the thin substrate has been described.
5 will be described with reference to FIGS.
In the drawings, the same reference numerals as those in FIGS. 1 to 4 denote the same or corresponding parts, and a description thereof will be omitted. FIG. 5 is a perspective view showing a mold structure for producing the insert molded body 3 of a thin substrate. In FIG. 5, reference numeral 6 denotes a movable mold, 7 denotes a fixed mold, 8 denotes a dividing line for dividing the movable mold 6 and the fixed mold 7, and the movable mold is divided by the dividing line 8. 6 and the fixed mold 7 can be separated. FIG. 6 is an explanatory view showing a state where the movable mold 6 and the fixed mold 7 of the mold structure of the insert molded body 3 of the thin substrate are divided at the dividing line surface 8. In FIG. 6, reference numeral 9 denotes a movable mold 6 which is provided in
The closed surface 10 which is a flat surface for closing the upper surface of the thin substrate 1 when the lower resin 2a shown in FIG. 1 is formed is an engraved space for forming the upper resin 2b shown in FIG. 1 by secondary injection. . Reference numeral 11 denotes a runner which is a resin flow path provided in the fixed mold 7; 12a, a primary ejection side pocket for accommodating the nest 13 shown in FIG. 7; The pockets 12 a and 12 b are connected to the runner 11. Reference numeral 13 denotes a nest having a space of a carved portion for molding the lower resin 2a, a positioning pin 15 and a gate 16, and 14 denotes a T-shaped runner switching valve for manually rotating the T-shaped groove. This allows the thermoplastic elastomer resin 2 to flow at any one of the primary injection side and the secondary injection side, or both the primary injection side and the secondary injection side.

FIG. 7 is a structural view showing the structure of the insert 13. FIG. 7 (a) is a plan view, and FIG. 7 (b) is a sectional view showing a side surface. In the figure, a nest 13 has a positioning hole 15a.
The thin substrate 1 having the following is set by engaging with the positioning pin 15, and an engraved portion below the nest 13 is provided so that the lower resin 2 a is molded at the time of the primary injection, and the resin flows into the engraved portion. Is provided with a resin inlet gate 16. The gate 16 is provided in the pocket 1 of the fixed mold 7.
It communicates with the runner 11, which is the resin flow path when stored in the 2a, 12b. FIG. 8 is a plan view showing a state in which the insert 13 in which the thin substrate 1 is set is stored in the pocket 12a of the fixed mold 7 in order to perform the primary injection, and FIG. FIG. 10 is a cross-sectional view showing a state in which the fixed mold 7 is closed, and FIG.
Ejector pin 1 from below to remove nest 13 from
FIG. 11 is an explanatory view showing the state of the insert 13 on the fixed side 7 pushed up by 7 and the spool 11 which is a resin flow path. FIG. 11 shows the insert 13 after the primary injection has been completed for secondary injection. FIG. 12 is a plan view showing a state where the mold 7 is housed in a pocket 12b of the mold 7, and FIG.
FIG. 13 is a sectional view showing a state in which is closed, and FIG. 13 shows the insert 13 in the fixed mold 7 pushed up by the ejector pin 17 from below to take out the insert 13 from the pocket 12b of the fixed mold 7 after the secondary injection. FIG. 14 is a plan view showing a state where the insert molded body 3 of the thin substrate is taken out with the spool 11 after the secondary injection.

Next, the operation will be described with reference to the drawings. In FIG. 7, a thin substrate 1 having a positioning hole 15a for positioning and fixing the
5 and fixed in the primary injection pocket 12a of the fixed mold 7 as shown in FIG. At this time, the runner switching valve 14 is oriented so as to flow toward the primary injection pocket 12a. Next, as shown in FIG. 9, the movable mold 6 is clamped, and the closed surface 9 provided on the movable plate 6 is closed.
To close the upper surface of the thin substrate 1. In this state, the thermoplastic elastomer resin 2 is filled from below the thin substrate 1,
The primary injection is completed by molding the lower resin 2a. afterwards,
The insert 13 is pushed up by the ejector pin 17 and the runner 1
1 is aligned with the end face of the insert 13 and cut by hand using a nipper, a cutter or the like, and after the primary injection is completed, the insert 13 filled with the lower resin 2a is taken out. Runner 1 cut at this time
1 is discharged out of the mold.

Next, the insert 13 after the primary injection is set in the secondary injection pocket 12b of the fixed mold 7 as shown in FIG. 11, and the runner switching valve 14 is used for the secondary injection on the secondary injection side. The flow is switched so as to flow into the pocket 12b. Next, as shown in FIG. 12, the movable mold 6 is tightened, and the upper engraved part 10 of the secondary injection product divided into two parts provided on the movable mold 6 is combined with the insert 13 to form the upper engraved part 10. Is filled with the thermoplastic elastomer resin 2 and the upper resin 2
b, and the secondary injection is completed. Thereafter, the insert 13 is pushed up by the ejector pin 17 as shown in FIG. 13 to obtain the insert molded body 3 of the thin substrate with the runner 11 as shown in FIG. Later, the runner 11 is eliminated to obtain the desired insert molded body 3 of a thin substrate.

In the second embodiment, the injection step
Usually, two-color molding machines having two injection nozzles are used to perform such molding. However, very few manufacturers have two-color molding machines, and the number of ordering manufacturers is limited. .
According to this embodiment, a commonly used nozzle 1 is obtained by exchanging the insert 13 and performing injection molding.
This makes it possible to use the injection molding machine of the present invention, and to realize a mold structure of the injection molding machine that can hold the thin substrate 1 at the center of the insert molding 3 of the thin substrate.

Embodiment 3 In the second embodiment, the mold structure of the insert molded body 3 of the thin substrate has been described. In this embodiment, an example in which the gate of the resin inlet of the insert 13 has an angle will be described with reference to FIGS. In the drawings, the same reference numerals as those in FIGS. 1 to 14 denote the same or corresponding parts, and a description thereof will be omitted. FIG. 15 is a cross-sectional view showing the insert 13a according to the third embodiment. The insert 13a provided with the engraved portion forming the lower resin 2a of the upper and lower divisions of the insert molded body 3 of the thin substrate is a fixed mold. 7 shows a state of being housed. The insert 13a has a positioning pin 15 for fixing the thin substrate 1 and a resin injection gate 16a through which the thermoplastic elastomer resin 2 flows into the engraved portion for molding the lower resin 2a at the time of primary injection. The gate 16a has an angle 18 so that when the thermoplastic elastomer resin 2 is primarily injected, the resin is sprayed from below the thin substrate 1.

FIG. 16 is an explanatory view showing a gate shape having no angle 18 like the gate 6a of the present invention.
In this gate shape, the thermoplastic elastomer resin 2 is injected from the horizontal direction of the thin substrate 1 so that the thermoplastic elastomer resin 2 enters between the thin substrate 1 and the closing surface 9 for closing during the primary injection. 2 shows a state in which the problem that the tip of the thin substrate 1 is deformed occurs. FIG. 17 is a cross-sectional view showing a state where the movable mold 6 having the closing surface 9 is mounted on the fixed mold 7 after the primary injection. FIG.
In the above, the gate 16a provided on the insert 13a has an angle 1 so that the tip of the gate 16a is blown against the thin substrate 1 from the plate side.
It has eight. FIG. 18 is an enlarged view showing the shape near the gate in FIG. 17 in an enlarged manner.

Next, the operation will be described with reference to the drawings. FIG.
, A plurality of positioning holes 15a for positioning and fixing
Through the positioning pin 15 of the insert 13a, and fix the insert 13a to the pocket 12 of the fixed mold 7.
a. Next, as shown in FIG.
Is mounted on the fixed mold 7 and clamped, and the upper surface of the thin substrate 1 is closed by the closing surface 9. In this state, the thermoplastic elastomer resin 2 is filled from below the thin substrate 1 with the gate 16a, and primary injection is performed. At this time, the thermoplastic elastomer resin 2 is filled from below the thin substrate 1 through the runner 11, which is a resin flow path, and the gate 16a, which is a resin injection port. The gate 16a, which is a resin injection port, has an angle 18 and the thermoplastic elastomer resin 2 has the angle 1
8 generates a force to push the thin substrate 1 obliquely upward and closes the thin substrate 1 at the time of primary injection.
Is always pushed up to the closing surface 9 provided in the. in this way,
By providing an angle 18 on the gate 16a, the thin substrate 1
There is no problem that the tip of the thin substrate 1 is deformed, and insert molding of the thin substrate 1 can be performed in a stable state.

Embodiment 4 FIG. In the fourth embodiment, the lower resin 2a around the thin substrate 1 after the primary injection is used to strengthen the fusion bonding between the lower resin 2a formed by the primary injection and the upper resin 2b formed by the secondary injection. In order to strengthen the melt strength by increasing the fusion bonding surface area by providing ribs, a production die structure of the insert molding 3 of a thin substrate for this purpose is shown in FIG.
This will be described with reference to FIG. In the drawings, the same reference numerals as those in FIGS. 1 to 14 denote the same or corresponding parts, and a description thereof will be omitted. FIG.
9 is a perspective view showing a state in which the mold structure according to Embodiment 4 is opened. In FIG. 19, reference numeral 6a denotes a movable mold according to this embodiment, and a groove 19 is provided on a closed surface 9a which is a flat surface for closing the upper part of the thin substrate 1 at the time of primary injection. FIG. 20 is an explanatory diagram illustrating the positional relationship between the groove 19 and the insert 12. FIG. 21 is an explanatory diagram illustrating the structure of the lower resin 2a formed after the primary injection. In FIG. 21, reference numeral 20 denotes a rib provided on the outer periphery of the lower resin 2a by the groove 19 during the primary injection.

Next, the operation will be described with reference to the drawings. Nesting 1
3 is set in the pocket 12a on the primary injection side, and the movable mold 6a and the fixed mold 7 are closed. At this time, the upper portion of the thin substrate 1 is closed by the closing surface 9 a provided with the groove 19 at the time of the primary injection of the movable mold 6 a around the thin substrate 1. A movable mold 6a is provided on a closing surface 9a for closing the upper portion of the thin substrate 1.
Is closed, a space of a groove 19 is formed around the thin substrate 1, and the thermoplastic elastomer resin 2 is filled in the lower engraved portion of the upper and lower halves of the insert 13 by the primary injection, and at the same time, the groove 19 is formed. The rib 20 is also filled with the thermoplastic elastomer resin 2, and a rib 20 protrudes around the outer periphery of the lower resin 2 a, that is, around the thin substrate 1.

Next, the process proceeds to the secondary injection step as described in the second embodiment. Due to the projections of the ribs 20, the area of fusion with the lower resin 2a after the primary injection at the time of the secondary injection increases, and the insert molded body 3 of a thin substrate that is more strongly melt-bonded can be obtained.

Embodiment 5 In the fourth embodiment, the production mold is heated to the heat deformation temperature of the thermoplastic elastomer resin 2 to adjust the temperature, and the thermoplastic elastomer resin 2 on the primary injection side and the secondary injection side is melted again to improve the fusion strength. A method of manufacturing an insert molded body of a thin substrate to be formed and a mold structure used in the manufacturing method will be described.

A path for circulating a heated fluid (not shown) is provided in the lower mold 4a shown in FIG. 2 or the fixed mold 7 shown in FIGS. 5 and 6, and heated water or oil or the like is provided in the path. Temperature adjusting means for adjusting the temperature of the fixed mold 7 to be circulated is added. Alternatively, the temperature adjusting means embeds a heater or the like directly in the fixed mold 7 and heats the thermoplastic elastomer resin 2.
The temperature for heating to the heat deformation temperature of is adjusted. However, when the temperature of the mold is not adjusted, the temperature at the time of injection is 200 ° C.
In the vicinity, the thermoplastic elastomer resin 2 is melted and injected, but after the primary injection is completed, the lower mold 4a or the product forming portion of the insert 13 is cooled to the temperature of the insert immediately after the thermoplastic elastomer resin 2 is filled. It is. The secondary injected thermoplastic elastomer resin 2 is instantaneously at around 200 ° C., but is immediately cooled to the mold temperature, and the thermoplastic elastomer resin 2 after the primary injection and the thermoplastic elastomer resin 2 at the time of the secondary injection. Cannot be firmly fused. To solve this,
The temperature of the fixed mold 7 is heated to the heat deformation temperature of the thermoplastic elastomer resin 2, and the resin after the primary injection is not cooled to room temperature but is maintained at the heat deformation temperature, and the lower resin 2 a is kept in a semi-solid state. The thermoplastic elastomer resin 2 in the semi-solid state after the primary molding in the next injection is again melted by the secondary injection heat.

By adopting the method and the structure of the insert molded body of the thin substrate described in the fifth embodiment, the fusion between the lower resin 2a and the upper resin 2b can be further strengthened. it can. The reason why the mold temperature was determined to be equal to or lower than the thermal deformation temperature of the thermoplastic resin is that if the temperature is further increased, the shape of the lower resin 2a formed by the primary injection may be melted again and the shape may be lost. is there.

Embodiment 6 FIG. In the second embodiment, when removing the nest after the primary injection, the resin of the gate portion is manually removed using a nipper or a cutter, but in the sixth embodiment, the removal of the gate portion is automated. For this purpose, a block structure which is slidable in a direction perpendicular to the gate opening, has a gate shape for conducting the injected resin, and cuts the gate by the shearing force of this block is shown in FIGS. 22 and 23. This will be described below.
In the drawings, the same reference numerals as those in FIGS. 6 to 8 denote the same or corresponding parts, and a description thereof will be omitted. FIG. 22 is a plan view showing the structure of the fixed mold 7a according to the sixth embodiment, and FIG.
2 is a side view of the block 21 shown in FIG. 2 as viewed from an arrow 22b, in which a fixed mold 7a includes a gate 16 formed at the time of primary injection.
The block 21 for automatically cutting the resin of the portion is stored, and the block 21 is slidable in the direction of arrow 22. The block 21 has a thick neck portion 21a and a thin neck portion 21b, and the narrow neck portion 21b is provided with a cutout portion 21c as an opening so that the thermoplastic elastomer resin 2 injected into the gate 16 of the insert 13 flows. Have been.

Next, the operation will be described with reference to the drawings. FIG.
The primary injected thermoplastic elastomer resin 2
Flows from the runner 11 through the cutout 21 of the block 21 through the gate 16 into the engraved portion of the insert 13 to form the lower resin 2a. Before pushing up the insert 13 by the ejector pin 17, block sliding means for sliding the block 21 in the direction of the arrow 22a simultaneously with an external force (not shown) such as hydraulic pressure or mold opening from outside, for example, the block 21 by an angular mechanism. Slide the block 2
The runner 11 is automatically torn by the shear force of the notch 21c, and the resin at the gate 16 is automatically cut.

Embodiment 7 In the above-described Embodiment 6, in the mold structure for manufacturing the insert molded body 3 of the thin substrate, the resin cutting of the gate part is automatically performed after the primary molding. However, in order to more reliably perform the resin cutting of the gate part, the sliding is performed. The moving block is provided with a sharp edge at a portion where the thermoplastic elastomer resin 2 flows, and a mold structure capable of more reliably cutting the resin at the gate portion by the effect of a sharp edge blade is shown in FIGS.
5 will be described.

FIG. 24 is a side view of the block 21d as viewed from the arrow 22b shown in FIG. 22, and the block 21d has a thick neck portion 21e and a thin neck portion 21f. A square hole 21g, which is an opening, is provided so that the thermoplastic elastomer resin 2 injected to the port 16 flows. FIG. 25 shows the block 21d and the runner-1.
FIG. 22 is an explanatory view showing the relationship between 1 and the gate 16, wherein a sharp edge having an angle 23 is formed on one side of a square hole 21g in a block 21d, and the block 21d is pulled out in the direction of arrow 22a shown in FIG. Then, the sharp edge cuts into the resin remaining in the gate 16 portion.

Next, the operation will be described with reference to the drawings. FIG.
In the same manner as above, the primary injected thermoplastic elastomer resin 2
Flows through the gate 16 from the runner 11 through the square hole 21g of the block 21d, into the engraved portion of the nest 13, and forms the lower resin 2a. Before pushing up the insert 13 by the ejector pin 17, the block 21 d slides in the direction of the arrow 22 a at the same time as an external force (not shown) such as hydraulic pressure or mold opening from outside, for example, slides the block 21 d by an angular mechanism. Let block 2
Due to the shear force of the square hole 21g of 1d and the effect of the sharp-edged knife, the runner 11 can be automatically torn more effectively and the resin at the gate 16 can be cut with a weaker force.

In the seventh embodiment, the block 21d
The cut portion for the resin is made into a square hole 21g, so that the cutout portion 21 shown in FIG.
In the shape of c, the runner 11 may escape in the upward direction and the resin at the gate 16 may not be reliably cut. However, since the seventh embodiment has a hole shape, the runner 11 has a hole shape.
Can be prevented from escaping upward and can be reliably cut automatically. Further, in the seventh embodiment, an example was described in which the shape of the opening was a square hole, but the opening was formed in another polygonal or round shape, and the gate was slid when the block was slid.
A sharp edge may be provided in a direction in which the resin bites into the resin of the gate portion.

Embodiment 8 FIG. In the second embodiment, the insert 13 is manually taken out of the mold structure for manufacturing the insert molded body 3 of the thin substrate, and is replaced with each of the primary injection and the secondary injection. A mold structure in which the product engraving portion in the side mold is slid to move from the primary injection to the secondary injection will be described with reference to FIGS.

FIG. 26 is a sectional view showing a structure of the mold structure according to the eighth embodiment in a mold-clamped state. This molding die is a cavity block slidable in the direction of arrow 59 in a fixed die 57. 58. This cavity block 58 is provided with a nest 13 shown in FIG.
It has a lower engraved portion 60 and a positioning pin 15 on the lower side of the product having the same shape as the above, so that the thin substrate 1 can be set. Reference numeral 56 denotes a movable mold, which has a closed surface 61 for closing the thin substrate 1 at the time of the primary injection, and an upper engraved portion 62 at the upper and lower parts of the product which forms the upper part of the product at the time of the secondary injection. FIG. 27 is a cross-sectional view showing a mold opening state of the mold structure shown in FIG. 26, FIG. 28 is a cross-sectional view showing a state of a molding die during a first injection step of the mold structure shown in FIG. 26, and FIG.
FIG. 7 is a cross-sectional view showing a state of a molding die during a second injection step of the die structure shown in FIG.

Next, the operation will be described with reference to the drawings. FIG.
In the first injection step, the thin substrate 1 is fixed
The cavity block 58 of No. 7 is set in the product engraving portion 60 below the upper and lower two parts for the primary injection, and then the movable mold 56 is mounted on the fixed mold 57 to fasten the mutual molds. At this time, the product engraving part 6 under the upper and lower two parts for primary injection
Reference numeral 0 denotes a movable mold 56 for closing the thin substrate 1 at the time of primary injection.
The thin substrate 1 is brought into close contact with the closed surface 61 of the movable mold 56 by the resin injection pressure. Next, the thermoplastic elastomer resin 2 is primarily injected into the product engraved portion 60 below the upper and lower two-parts for the primary injection, and the lower resin 63 that is the lower part of the two parts of the product is manufactured. The mold is opened again, and the resin at the gate portion of the lower resin 63 is cut by hand using a nipper or a cutter, and the resin at the gate portion is discharged out of the mold.

Next, the cavity block 58 in the fixed mold 57 shown in FIG. 29 is indicated by an arrow to a position opposed to the upper product engraved portion 62 in the upper and lower two-parts for secondary injection of the movable mold 56. To fill the thermoplastic elastomer resin 2 into the two-part upper armament engraving portion 62 of the product on the secondary injection side. At this time, after the primary injection molded part is re-melted by the plasticization temperature of the secondary injection resin, the primary injection molded part and the secondary injection molded part are joined in the cooling step, and the insert molded body 3 of the thin substrate is obtained.

With the above-described structure, the structure of the molding die is such that the product engraving portion 63 in the fixed mold 57 is slid and moved from the primary injection to the secondary injection. The process and the transition to the secondary injection process are labor-saving, and the molding time can be shortened.

Embodiment 9 FIG. In the ninth embodiment, a description will be given of a mold structure for automatically cutting the resin at the gate portion, which is a resin flow path, when shifting from the primary injection to the secondary injection. FIG. 30 is a sectional view showing a manufacturing die structure of an insert molded body of a thin substrate according to the ninth embodiment. In FIG. 30, reference numeral 56a denotes a movable mold, and a flat portion 61 for closing the thin substrate 1 at the time of the primary injection.
And a movable cavity block 64 provided with an upper engraved portion 62 of a product upper and lower divided into two parts, which forms a product upper part at the time of secondary injection. This movable side cavity block 64
Is supported by the movable mold 56a by the coil spring 65 and is movable within a predetermined range in the vertical direction. Also,
The movable-side cavity block 64 is configured such that the shape below the upper and lower two-parts for primary molding provided in the fixed-side cavity block 58a engages with the gate portion for flowing the resin into the engraved portion 60 when the mold is closed. Is provided with a gate block 66. The gate block 66 is movable
a above the movable side cavity block 6
4 is engaged with a hole having the same shape as the gate block 66 provided therein, and can slide up and down in this hole. That is,
When the mold is opened, the movable mold 56a and the gate block 66 are raised first, and the movable cavity block 64 is pressed downward by the coil spring 65 so that the coil spring 65
Until the pressure is released from compression
4 is pressed by the cavity block 58a on the fixed side, and rises with a delay to the movable mold 56a. Also,
Reference numeral 58a denotes a fixed-side cavity block provided with a primary injection product engraving portion 60 installed on the fixed-side mold 57a. A gate block 67 is provided at the gate of the fixed-side cavity block 58a at a position where the gate block 67 engages with the movable-side cavity block 64 when the mold is closed.
Is mounted slidably in the vertical direction supported by a coil spring 68 attached to the gate block 6 when the mold is opened.
7 can be pushed up.

Next, the operation will be described with reference to the drawings. FIG.
Shows a state in which the movable-side cavity block 64 is pressed downward by the coil spring 65 against the fixed-side cavity block 58a when the movable-side mold 56a is opened. As shown in FIG. 31, after the primary injection, as the movable mold 56a moves upward when the mold is opened, the gate block 66 in the movable cavity block 64 simultaneously rises, but the movable cavity block 64 moves upward. 64 is pushed down by the coil spring 65 and rises with a time difference. That is, the cavity block 64 on the fixed side and the cavity block 58a on the fixed side remain closed during this time difference. At this time, at the same time, the gate block 67 of the fixed mold 57a is pushed up from below by the coil spring 68, and the shearing force generated at this time can automatically cut the resin of the gate portion generated by the primary injection.

The gate block 67 is positioned at a position where it engages with the gate port of the cavity block 58a on the fixed side as shown in FIG.
The resin is supplied to the product engraving portion 60 of the fixed side cavity block 58a through the square hole at the time of injection, and the coil spring 68 is injected after injection.
The resin at the gate is automatically cut by the shearing force of the gate. With such a configuration,
It is possible to automatically cut the resin at the gate,
The work of cutting the resin at the gate portion can be saved, and the molding time can be shortened.

Embodiment 10 FIG. In the tenth embodiment, when the process shifts from the primary injection process to the secondary injection process as a safety device, the mold closing operation occurs unless it is confirmed that the fixed side cavity block 58 shown in FIG. 26 has completely moved to one side. An example in which no sequence circuit is provided will be described. FIG. 32 shows a detection switch 69a,
It is explanatory drawing which shows the type | mold structure provided with 69b, 69c. FIG. 33 is an explanatory diagram for explaining the operation of the detection switches 69a, 69b, 69c and the output operation of this type structure.

Next, the operation will be described with reference to the drawings. The state shown in FIG. 32 shows the state of the primary injection shown in FIG. 33. The detection switch 69a is ON, the detection switch 69b is OFF, and the detection switch 69c is ON. In this state, the fixed-side cavity is in the position of the primary injection. It is confirmed that there is
A primary injection is performed. Next, in the state of the secondary injection, the detection switch 69a is OFF, the detection switch 69b is ON,
The detection switch 69c is in the ON state. In this state, it is confirmed that the fixed-side cavity has moved to the secondary injection position, and the secondary injection is performed. In the mold open state, each detection switch is in the state shown in Table 1, and the injection is in the blocking state.

In the tenth embodiment, an example has been described in which a microswitch is used as a detection switch as a position detecting means. However, the present invention is not limited to the microswitch, but may be a switch for switching a signal indicating a state, such as a proximity switch or a photoelectric sensor. Good. As described above, by detecting the moving position of the mold structure and performing the molding operation, the operation can be performed more safely.

[0054]

According to the present invention, the mold structure of the insert molded body of the thin substrate is provided with a mold-side positioning portion for positioning the thin substrate in the insert, and is opposed to one surface of the positioned thin substrate. A gate for conducting the resin is provided in a carved portion carved in a predetermined shape on the surface, and a first pocket and a second pocket for holding the insert are provided in the first mold, and the first and second pockets are provided. A runner for engaging with the nested gate held in the second pocket and supplying the injected resin is provided, and the first mold is mounted on the second mold by attaching the runner to the first mold. A predetermined surface opposing the closing surface for closing the other surface of the thin substrate positioned on the nest held in the pocket and the other surface of the thin substrate positioned on the nest held in the second pocket; So that it has a carved part carved into the shape Then, by inserting the insert into the first and second pockets and molding, it is possible to use an ordinary one-nozzle injection molding machine, and also to inject both surfaces of the thin substrate positioned in the insert one by one with resin. Since the molding is performed, it is possible to provide an insert molded body of a thin substrate which can form an insert molded body of a thin substrate holding the center of the thin substrate.

According to the next invention, the mold structure of the insert molded body of the thin board is such that the nested gate presses the end of the thin board to the closing surface side by the resin which has passed through the gate. In this case, the resin injected from the gate presses the end of the thin substrate toward the closed surface side, so that
The effect of providing a mold structure of an insert molded body of a thin substrate capable of molding an insert molded body of a thin substrate in a stable state without causing a problem that an end portion of the thin substrate is deformed. Play.

Further, according to the next invention, when the mold structure of the insert molded body of the thin substrate is provided with a groove on the closed surface of the second mold near the outer periphery of the thin substrate to be closed,
Since the resin is filled in the groove by the primary injection, a rib-like projection is formed on the resin near the outer periphery of the molded thin substrate by performing the primary injection on the nest held in the first pocket, and the second The area of fusion with the resin injected secondarily into the nest held in the pockets is increased by the rib-shaped projections, so that an insert molded body of a thin substrate that is more firmly fusion-bonded can be formed.

Further, according to the next invention, the mold structure of the insert molded body of the thin substrate is changed to the following.
A block sliding means which is slidably provided in a gate opening of the insert held by the second mold, and which has an opening for engaging the runner with the gate to conduct the resin; However, when the gate block is slid, the block sliding means slides the gate block, and the runner is automatically torn by the shearing force of the opening of the gate block. Therefore, there is an effect that the resin at the gate portion can be automatically cut.

According to another aspect of the present invention, the mold structure of the insert molded body of the thin substrate is such that the block sliding portion includes the first and second blocks.
When the gate cutting block is slid in conjunction with the opening of the molding die, the block sliding means becomes first and second.
The gate block is slid in conjunction with the opening of the molding die, and the runner is automatically torn by the shearing force of the opening of the gate cut block. It has an effect that can be cut.

Further, according to the next invention, when the mold structure of the insert molded body of the thin substrate is provided with temperature adjusting means for maintaining the second mold at the heat deformation temperature of the injected resin, Since the temperature of the resin molded by the primary injection injected into the nest held in the pocket is heated and maintained to the heat deformation temperature of the resin, the molding is performed by the secondary injection injected into the nest held in the second pocket. The obtained resin is melted with the semi-solid resin molded by the previous injection, so that it is possible to form an insert molded body of a thin substrate which is more strongly melt-bonded.

Further, according to the next invention, the method for manufacturing an insert molded body of a thin substrate is provided with a temperature adjusting step of maintaining the temperature of the second molded portion at the thermal deformation temperature of the injected resin. Since the temperature of the resin molded in the first injection step is heated and maintained to the thermal deformation temperature of the resin, the resin molded in the second injection step melts with the semi-solid state resin molded by the previous injection. Therefore, it is possible to form an insert molded body of a thin substrate that is more strongly melt-bonded.

According to the next invention, the mold structure of the insert molded body of the thin substrate is provided with a mold-side positioning portion for positioning the thin substrate in the insert, and the die structure is opposed to one surface of the positioned thin substrate. A gate for energizing the resin is provided in a carved portion formed in a predetermined shape on the surface to be formed, and a pocket for holding the insert is provided in the first molding die, and a gate for the insert held in the pocket. And a runner for supplying the injected resin by engaging with the first mold.
And a molding portion mounted on the molding die to form an insert molded body of the thin substrate, wherein the engagement position moving means moves the engagement positions of the first and second molding dies from the first engagement position to the first engagement position. And a closing surface for closing the other surface of the thin substrate positioned at the nest held by the pocket at the first engaging position, and a second engaging position. In the first engagement position, when the thin-walled substrate positioned at the nest held in the pocket has an engraved portion engraved in a predetermined shape facing the other surface, the thin substrate is held in the pocket at the first engagement position. A primary injection is performed by engaging the nest with the closing surface, and then the second injection is performed.
The secondary injection can be performed by moving to the engagement position of the nest and the engraved part of the molding part, so the transition to the primary injection step and the secondary injection step is labor-saving and the molding time is shortened. It has an effect that can be done.

Further, according to the next invention, the mold structure of the insert molded body of the thin substrate is detected when the first and second molding dies have moved from the first engagement position to the second engagement position. When the movement detecting means is provided, the molding operation can be performed by detecting the movement position of the molding die, and there is an effect that the operation can be performed more safely.

[Brief description of the drawings]

FIG. 1 is a structural diagram showing an insert molded body of a thin substrate formed by a method of manufacturing an insert molded body of a thin substrate and a mold structure according to the present invention.

FIG. 2 is a structural diagram showing a mold structure of an insert molded body of a thin substrate according to Embodiment 1 of the present invention.

FIG. 3 is a plan view showing a state of the insert molded body of the thin substrate after the end of the primary injection according to the first embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a mold structure of an insert molded body of a thin substrate at the time of secondary injection according to Embodiment 1 of the present invention.

FIG. 5 is a perspective view showing a mold structure of an insert molded body of a thin substrate according to a second embodiment of the present invention.

FIG. 6 is an explanatory view showing a state where the mold structure shown in FIG. 5 is opened.

FIG. 7 is a structural diagram showing a nested structure according to a second embodiment of the present invention.

FIG. 8 is a plan view showing a state of nesting at the time of primary injection by a mold structure of an insert molded body of a thin substrate according to a second embodiment of the present invention.

FIG. 9 is a side sectional view showing the mold clamping state of FIG. 8;

FIG. 10 is an explanatory diagram illustrating a state in which a nest is removed after primary injection from a mold structure of an insert molded body of a thin substrate according to a second embodiment of the present invention.

FIG. 11 is a plan view showing a state at the time of secondary injection using a mold structure of an insert molded body of a thin substrate according to Embodiment 2 of the present invention.

FIG. 12 is a side sectional view showing the mold clamping state of FIG. 11;

FIG. 13 is an explanatory diagram illustrating a state in which a nest is taken out after secondary injection from a mold structure of an insert molded body of a thin substrate according to a second embodiment of the present invention.

FIG. 14 is a plan view showing an insert molded body of a thin substrate formed with a runner after the end of secondary injection according to Embodiment 2 of the present invention.

FIG. 15 shows a nested gate according to the third embodiment of the present invention.
FIG.

FIG. 16 is an explanatory view showing a conventional gate shape.

FIG. 17 is a side sectional view showing a state of nesting at the time of primary injection in a mold structure of an insert molded body of a thin board according to Embodiment 3 of the present invention.

18 is an enlarged view of the vicinity of the nested gate shown in FIG.

FIG. 19 is a structural diagram showing a mold structure of an insert molded body of a thin substrate according to Embodiment 4 of the present invention.

20 is an explanatory diagram illustrating a relationship between a groove provided in the mold structure shown in FIG. 19 and a thin substrate.

FIG. 21 is an explanatory diagram illustrating a state of a protrusion formed according to a fourth embodiment of the present invention.

FIG. 22 is an explanatory diagram illustrating a gate cutting block provided in a mold structure according to a sixth embodiment of the present invention.

FIG. 23 is a side view showing a gate cutting block according to a sixth embodiment of the present invention.

FIG. 24 is a side view showing a gate cutting block according to a seventh embodiment of the present invention.

FIG. 25 is a side view showing a gate cutting block in another mode according to the seventh embodiment of the present invention.

FIG. 26 is a structural diagram showing a mold structure of an insert molded body of a thin substrate according to an eighth embodiment of the present invention.

FIG. 27 is an explanatory diagram showing a mold opening state of the mold structure shown in FIG. 26;

FIG. 28 is an explanatory view showing a state at the time of primary injection of the mold structure shown in FIG. 26;

FIG. 29 is an explanatory view showing a state at the time of secondary injection of the mold structure shown in FIG. 26;

FIG. 30 is a structural diagram showing a mold structure of an insert molded body of a thin substrate according to Embodiment 9 of the present invention.

FIG. 31 is an explanatory diagram showing a mold opening state of the mold structure shown in FIG. 30;

FIG. 32 is a structural diagram showing a mold structure of an insert molded body of a thin board according to Embodiment 10 of the present invention.

FIG. 33 is an explanatory diagram illustrating the operation of the movement detecting means according to the tenth embodiment of the present invention.

FIG. 34 is a cross-sectional view of a conventional thin-substrate insert molded body.

FIG. 35 is a cross-sectional view showing a mold structure of a conventional insert molded body of a thin substrate.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 thin substrate, 2 thermoplastic elastomer resin, 3 insert molded body of thin substrate, 4a lower mold having first engraved portion (first molded portion), 4b upper mold having closed surface (second molded portion) 5, upper mold having a carved portion (third molding), 6, 56 movable mold (second molding), 7, 57 fixed mold (first molding), 9,
61 Closed surface of movable side mold, 10, 62 Engraved portion of movable side mold, 11 runner, 12 pocket, 13
Nesting, 15 positioning pin, 15a positioning hole, 16
Gate, 19 movable mold groove, 20 rib, 21,
66, 67 Gate cutting block, 60 Engraved part of nest, 69 Movement detecting means.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI B29C 45/78 B29C 45/78 45/80 45/80 // B29K 21:00 B29K 21:00 B29L 9:00 B29L 9:00 31:34 31:34 (58) Field surveyed (Int. Cl. ⁷ , DB name) B29C 45/12-45/84 B29C 33/12-33/18

Claims (9)

(57) [Claims] A mold positioning portion for positioning the thin substrate by engaging with a substrate positioning portion provided on the thin substrate, and a predetermined position on a surface opposite to one surface of the positioned thin substrate. A nest provided with a gate for conducting the resin in the engraved portion engraved in the shape of, and a first pocket and a second pocket for holding the nest at respective positions are provided, and these first and second pockets are provided. A first molding die provided with a runner for supplying the injected resin by engaging with the nested gate held in the second pocket; and mounting the first molding die on the first molding die. A closing surface for closing the other surface of the thin substrate positioned on the nest held by the first pocket, and the other of the thin substrate positioned on the nest held by the second pocket; In a predetermined shape facing the surface of A mold structure of an insert molded body of a thin substrate provided with a second molding die having a carved portion. 2. A nested of gate - DOO, the gate - claim 1, characterized in that the injected resin from bets is provided so as to press the end portion of the thin substrate on the closing surface side Mold structure of insert molded body of thin board. 3. A process according to claim 1 closing surface of the second mold, characterized in that with a groove near the outer periphery of the thin substrate which closes
The mold structure of the insert molded body of the thin substrate according to the above. 4. A gate which is slidably provided in a gate opening of a nest held by a second mold and has an opening for engaging with a runner and the gate to conduct the resin. 2. The mold structure of an insert molded body for a thin substrate according to claim 1 , further comprising a block for cutting the gate and a block sliding means for sliding the block for gate cutting. 5. The insert according to claim 4 , wherein the block sliding portion slides the gate cutting block in conjunction with opening of the first and second molds. Mold structure of molded body. 6. The mold structure for an insert molded body of a thin substrate according to claim 1 , further comprising a temperature adjusting means for maintaining the second molding die at a thermal deformation temperature of the injected resin. 7. The mold structure of an insert molded body for a thin substrate according to claim 1 , further comprising a temperature adjusting step of maintaining a temperature of the second molding die at a thermal deformation temperature of the injected resin. 8. A mold-side positioning portion for positioning the thin substrate by engaging with a substrate-side positioning portion provided on the thin substrate, and a predetermined position is provided on a surface facing one surface of the positioned thin substrate. A nest provided with a gate for conducting the resin in the engraved portion engraved in the shape of, and a pocket for holding the nest are provided, and the nest is engaged with the gate of the nest held in the pocket. A first molding die having a runner for supplying the injected resin, a second molding die having a molding portion mounted on the first molding die to form an insert molded body of a thin substrate, Engaging position moving means for moving the engaging positions of the first and second molds from the first engaging position to the second engaging position;
At the engaging position, the closing surface closing the other surface of the thin substrate positioned at the nest held by the pocket; and at the second engaging position, the nest held by the pocket. A mold structure for an insert molded body of a thin substrate, comprising: an engraved portion engraved in a predetermined shape so as to face the other surface of the positioned thin substrate. 9. The apparatus according to claim 8 , further comprising a movement detecting means for detecting that the first and second molds have moved from the first engagement position to the second engagement position. Mold structure of insert molded body of thin substrate to be used.