JP2000061977A - Sealing injection molding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing injection molding device in which injection molding and sealing molding are not separately performed, low pressure injection is enabled, miniaturization is contrived, installation area is small, and cost reduction of a molding machine is contrived. SOLUTION: In the sealing injection molding device 20, a turning means 25, a vertically moving means 25A and spirally moving means 25B are provided respectively in an axis connected to the body of an agitating injection plunger of an injection part 21. Furthermore an injection cylinder 23 is formed into cylindrical slenderness and a heater of the injection part is fitted so as to surround the injection cylinder, The injection part 21 in which the agitating injection plunger is inserted into the injection cylinder 23, is incorporated into a mold 40 which is fitted between a fixed plate 20A and a moving plate 20B, so as to be directly joined.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention supplies a sealant housed in a hopper from a supply unit for supplying the sealant to a weighing unit.
The sealing material, which has been measured in a predetermined amount while being melted in the measuring section, is pushed toward the injection section by the measurement plunger, and the stirring material is melted to a predetermined temperature in the injection section and stirred, and the stirring injection plunger is operated. The present invention relates to a sealing injection molding apparatus for injecting a cavity toward a cavity through a runner of a mold.

[0002]

2. Description of the Related Art Conventionally, as this type, Japanese Patent Laid-Open No.
There is one such as that shown in FIG.

Referring to FIG. 7, the sealing injection molding device 15 is composed of an in-line screw injection molding machine 1A and a sealing molding machine 9.

The sealing material heated and melted by the plasticizing means 1 is supplied into the required number of cylinders 10 through the hot runners 8A in the hot runner structure 8 and fitted into the respective cylinders 10. The molten sealing material in the cylinder 10 is injected by the piston 11, and the electronic component 7 is sealed and molded in the cavities 5 and 6 engraved in the upper and lower molds 3 and 4 of the mold 2.

[0005]

However, in such a conventional sealing injection molding apparatus 15, as the plasticizing means 1 for the sealing material, an in-line screw injection molding machine 1A for injecting at a high injection pressure is separately provided. Since it is used for the body, it occupies a large occupied area, and in addition, the sealing molding machine 9 that receives the high injection pressure of the injection molding machine 1A to mold becomes large, and the cost of both molding machines 1A and 9 becomes high. Had challenges.

[0006] Therefore, the present invention provides a sealing injection molding apparatus which can achieve downsizing by low pressure injection, a small installation area, and cost reduction of a molding machine without separate injection molding and sealing molding. It is intended to be provided.

[0007]

In order to achieve the above-mentioned object, the invention described in claim 1 supplies a sealing material housed in a hopper from a supply portion for supplying to a measuring portion, and the measuring portion. The sealing material, which has been measured in a predetermined amount while being melted by, is pushed toward the injection part by the measurement plunger, and the sealing material that is melted and stirred at the predetermined temperature in the injection part is operated by the stirring injection plunger. Is a sealing injection molding device for injecting toward a cavity through a runner of the above, wherein a shaft connected to the stirring injection plunger main body of the injection section is provided with each means of rotation / vertical movement and spiral movement, The cylinder is formed in a cylindrical elongated shape, an injection unit heater is installed so as to surround the cylinder, and the injection unit in which the stirring injection plunger is fitted in the injection cylinder is installed between a fixed plate and a moving plate. In the mold It is characterized in that assembled so as to directly.

According to a second aspect of the present invention, in the sealing injection molding apparatus according to the first aspect, each of the means is a stirring rod projecting by being biased by a spring inserted in a hollow stirring injection plunger body. Is rotated in a state of protruding from the lower side of the stirring injection plunger to stir the sealing material, and the stirring injection plunger body is moved downward along the outer surface of the stirring rod to move the sealing material. There are three mechanical operations, a vertical motion for pushing and ejecting and a spiral motion for pushing and ejecting while rotating and agitating, and driving the rotary motor and vertical motor respectively.
It is characterized in that it is transmitted to a shaft connected to the stirring injection plunger through a belt so that the three mechanical operations can be single-acting or double-acting.

According to a third aspect of the present invention, in the sealing injection molding apparatus according to the first aspect, the stirring rod is provided with a plurality of protruding pieces on the outer surface.

According to a fourth aspect of the invention, the sealing material stored in the hopper is supplied from the supply portion to the measuring portion, and the sealing material measured in a predetermined amount while being melted in the measuring portion is weighed. A sealing injection molding device in which a plunger is pushed toward an injection part and a sealing material heated by the injection part and melted to a predetermined temperature is injected toward a cavity through a runner of a mold by the operation of an injection plunger. There is a vertical movement means on the shaft connected to the injection plunger body, the injection cylinder is formed into a slender cylindrical shape, the injection section heater is mounted so as to surround the injection cylinder, and the injection plunger is inserted into the injection cylinder. It is characterized in that the ejected part is assembled so as to be directly connected to the mold mounted between the fixed plate and the movable plate.

According to a fifth aspect of the present invention, in the sealing injection molding apparatus according to the fourth aspect, the vertical movement means is a vertical movement mechanism operation for lowering the injection plunger to press / inject a sealing material. Therefore, the drive of the vertical movement motor is driven by a pulley.
It is characterized in that it is transmitted to a shaft connected to the injection plunger main body through a belt so that the injection plunger can be moved up and down.

According to a sixth aspect of the present invention, in the sealing injection molding apparatus according to the fourth or fifth aspect, a cartridge heater is inserted into the injection plunger body.

According to a seventh aspect of the present invention, in the sealing injection molding apparatus according to the first or fourth aspect, the injection plunger body is made of a material having a low thermal conductivity or a hollow body in order to reduce heat radiation. I am trying.

The invention according to claim 8 is the sealing injection molding apparatus according to claim 1 or 4, characterized in that the heater of the injection portion is a casting heater.

According to a ninth aspect of the present invention, in the sealing injection molding apparatus according to the first or fourth aspect, a supply cylinder provided with an inlet for the sealing material is provided in the hopper, and the supply cylinder has a supply plunger. Is fitted and connected to the measuring cylinder.

The invention according to claim 10 is the invention according to claim 1 or 4.
In the sealed injection molding apparatus described, the inside of the hopper,
It is characterized in that the auxiliary supply tool is attached to the outside or both of them.

[0017]

DETAILED DESCRIPTION OF THE INVENTION

[0018]

First Embodiment A sealing injection molding device according to a first embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is an overall view showing a sealing injection molding apparatus according to the first embodiment.

In FIG. 1, 20 is a sealing injection molding apparatus,
21 is an injection part, 26 is a metering part, 30 is a supply part, and 40 is a mold.

The supply unit 30 is provided with a hopper 34 containing a sealing material 36 such as granules, flakes or powder, and the lower end of the hopper 34 is connected to the inlet 34a of the weighing cylinder 28 of the weighing unit 26. I am letting you.

Further, the measuring unit 26 includes the measuring cylinder 2
The tip end of 8 is the inlet 2 of the injection cylinder 23 of the injection unit 21.
It is connected to 3a.

The stirring injection plunger 22A provided in the injection cylinder 23 of the injection unit 21 is rotated by the vertical movement and spiral movement means 25, 25A, 25B by the motor 2.
Ball screw 25a and ball screw nut 2 inserted into the shaft connected to the stirring injection plunger body 22a via the pulley belts 25g and 25g from 5c and 25d.
5b is driven.

Further, the stirring injection plunger 22A operated by selecting these three means is the molten sealing material 36b.
Is sealed and injection-molded into the cavity 47 through the runner 46 of the mold 40 clamped between the fixed plate 20A and the movable plate 20B.

As described above, the supply unit 30, the measuring unit 26, the ejection unit 21, and the respective means 25, 25A, 25B are positioned on the fixed plate 20A without being separately placed, and the fixed plate 20A.
The die 40 located below the mold is directly connected by the injection unit 21 to be integrated.

FIG. 2 is a cross-sectional view of the essential parts showing in more detail the construction of the sealing injection molding apparatus 20 of FIG.

In FIG. 2, the hopper 3 serving as the supply unit 30.
In Fig. 4, a stirring screw 37 is installed inside thereof, and a so-called supply auxiliary tool 38 such as a vibrator 35 is installed outside the wall surface of the hopper 34. Further, the supply heater 33 is attached near the inflow port 34a to assist the melting of the sealing material 36.

Therefore, the granular sealing material 36 accommodated in the hopper 34 is melted by these supply aids 38 without being bridged at the inlet 34a and obstructing the inflow. It will flow in.

In the measuring unit 26, a measuring plunger 27 is fitted in the measuring cylinder 28. The outer circumference of the measuring cylinder 28 is surrounded by a measuring unit heater 29. The tip of the measuring cylinder 28 is connected to a push port 23 a provided in the injection cylinder 23.

Therefore, in the measuring unit 26, the supply unit 3
The sealing material 36 that has flowed in from 0 is melted by the metering unit heater 29 in a state where the push-in port 23a is closed, and the metering plunger 27 retreats to a position where a predetermined amount is reached.

In the injection section 21, 22A is a stirring injection plunger fitted in an injection cylinder 23, and an injection section heater 24 is mounted so as to surround the injection cylinder 23 on its outer periphery.

The injection heater 24 is a cast-in heater, which is a cast-in sheath heater having a plurality of heat zones, so that a predetermined temperature can be controlled at a predetermined temperature.

Further, the casting heater, which is the injection heater 24, is provided with a cooling port 24a so that a heat medium such as a liquid or a gas can be circulated so that the temperature control width can be narrowed.

Since the heater is cast in this way, there is little temperature change and oxidative deterioration, and breakage is less likely to occur.
Uniform surface heating is possible.

As the heater, a band heater may be used when the surface shapes can be closely attached.

Further, by covering the outside of the injection heater 24 with a cover plate 24b, it is possible to prevent heat radiation and convection from the outside air to avoid the influence on the injection heater 24.

Therefore, since the temperature of the injection section 21 can be controlled with high accuracy, the sealing material 36 is melted to a predetermined temperature,
Further, the temperature after the sealing material 36 is melted can be kept constant, and good fluidity can be obtained.

The stirring injection plunger 22A includes a hollow stirring injection plunger main body 22a and the main body 22a.
The spring 22c inserted in the spring 22c
The stirring injection plunger body 22a is biased by c and projects from the lower side of the stirring injection plunger body 22a.

The stirring rod 22b has a plurality of protruding pieces 22d on its outer surface. In the first embodiment,
The four protruding pieces 22d are provided over the entire length of the stirring rod 22b, and are formed in a cross shape in cross section.

Further, the stirring injection plunger body 22a
Is connected to the shaft 25e at its upper part. The shaft 25e has a ball screw groove e1 and a ball spline groove e.
Processed by crossing 2 and.

The ball screw 25a is attached to the shaft 25e.
The ball screw nut 25b and the ball screw nut 25b so as to vertically overlap with each other on the shaft 25e, and the rotation motor 25c and the vertical movement motor 25d are respectively connected to the pulley belts 25g and 25g.
Are connected via.

Accordingly, when only the vertical movement motor 25d is driven, the shaft 25e moves up and down, and the vertical movement means 25 for vertically moving the stirring injection plunger main body 22a to press and inject the melted sealing material 36b, and the rotation. Motor 25c
When only the shaft is driven, the shaft 25e rotates, and together with the stirring rod 22b protruding from the stirring injection plunger body 22a, the shaft 25e rotates, and the rotating means 25A that stirs the sealing material 36b melted in the pot 23b. , 3 with spiral moving means 25B for rotating, stirring and moving downward to press and eject
Each of the means is configured to be selectable as a single-action or double-action mechanism operation.

In the die part 40, 41 is an upper die, 42 is a lower die, 47 is a cavity carved in each die,
Reference numeral 5 denotes a cull insert provided so that the stirring rod 22b that has moved downward comes into contact with the melted sealing material 36b.
After that, the molten sealing material 36b is injected into the cavity 47 maintained at the curing temperature of the molten sealing material 36b to form a mold structure for sealing the electronic component.

FIG. 3 shows the injection section 21 in which the stirring injection plunger main body 22a is moved downward in the direction of the arrow from the stirring state shown in FIG.

That is, the stirring injection plunger main body 22a is moved downward against the spring 22c by either the vertical moving means 25 or the spiral moving means 25B connected to the stirring injection plunger main body 22a.

Then, the stirring rod 22b comes into contact with the cull insert 45, the stirring injection plunger body 22a is moved downward along the stirring rod 22b, the melted sealing material 36b is pressed, and the mold 40 is culled. Along the child 45, through the runner 46,
The state of being ejected toward the cavity 47 is shown.

The operation of the sealing injection molding apparatus 20 configured as described above will be described with reference to FIGS.

First, in the supply unit 30, the sealing material 36 housed in the hopper 34 is driven into the measuring cylinder 26 by driving the supply assisting tool 38 such as the stirring screw 37 and the vibrator 35, and at the same time, the sealing material is sealed. Since 36 receives the heat of the supply heater 33, melting starts.

The inflowing sealing material 36 is brought into a molten state by the heating of the heater 29 of the measuring portion, and the measuring plunger 27 is retracted to a predetermined position to complete the measurement. Subsequently, the stirring injection plunger main body 22a is raised, and the measuring plunger 27 is advanced to be pushed into the pot 23b of the injection cylinder 23.

Sealing material 26b pushed into pot 23b
Is heated by the injection unit heater 24 to a predetermined temperature, and further, as shown in FIG. 2, by operating the rotating means 25A to rotate the shaft 25e, the mixture is projected from the stirring injection plunger main body 22a. The molten sealant 36b in the pot 23b is agitated by the stirring rod 22b present, and the filler filled in the sealant 36b is dispersed and the temperature is homogenized.

When the molten sealing material 36b is homogenized to a predetermined temperature, the stirring injection plunger body 22a is moved downward along the stirring rod 22b as shown in FIG. The molten sealing material 36b pressed by is injected into the cavity 47 of the mold 40 to seal the electronic component fitted in the cavity 47. Production can be performed by repeating this mechanical operation.

[0052]

Second Embodiment A second embodiment of the present invention will be described with reference to FIG.

FIG. 4 is a cross-sectional view of essential parts showing a sealing injection molding apparatus according to the second embodiment.

In FIG. 4, the supplying section 30, the measuring section 26,
The mold 40, the injection cylinder 23, the injection part heater 24, and the cover plate 24b of the injection part 21 are the same as those in the first embodiment shown in FIGS. 1 to 3, and the injection plunger 22 of the injection part 21 is used.
The injection plunger 22
Is only the vertical movement.

That is, the injection plunger 22 different from the first embodiment has a cylindrical shape without the stirring rod 22b (see FIG. 2), and the injection cylinder 2
In order to prevent the heat radiation of the sealing material 36b melted in 3, the material having a small thermal conductivity or a hollow body made of the same material is used.

The injection plunger body 221 is connected to the vertical moving shaft 25f, and the vertical moving shaft 25f is fitted with a ball screw 25a and is connected to the vertical moving motor 25d via a pulley belt 25g. Vertical movement means 2
5 is provided.

Therefore, the injection plunger 2 which is difficult to radiate heat
2 is used to melt the sealing material 36b to a predetermined temperature
Can be easily pressed / injected toward the mold 40 by the mechanical operation of only the vertical movement means 25.

As described above, by making the mechanism operation of the injection plunger 22 only by the vertical moving means 25, the sealing injection molding apparatus 20 can be further downsized and reduced in cost.

The other structure and operation are the same as those in the first embodiment, and therefore their explanations are omitted.

Here, the material having a small thermal conductivity means
It refers to steel materials such as high carbon steel, tool steel and nickel chrome steel, and ceramics.

(Modification 1) FIG. 5 is a sectional view showing a modification of the portion A in FIG. 4A.

In FIG. 5, reference numeral 30 denotes a supply unit, which is a hopper 3
4 is provided with a supply cylinder 32 having an inlet 34b into which the sealing material 36 falls.

Then, the supply plunger 31 fitted in the supply cylinder 32 forcibly and yet the supply cylinder 3
2 is heated and pressed by the supply heater 33 to melt the sealing material 36, and is supplied into the measuring cylinder 28.

In the supply unit 30, the amount of the sealing material 36 forcedly flown into the measuring cylinder 28 from the inflow port 34a by the supply plunger 31 is insufficient because the unmelted portion is too large. When the plunger 27 does not retreat to the predetermined position, the supply plunger 31 is raised again and the supply of the shortage is repeated.

Therefore, when the sealing material 36 is in the form of granules, powder, or the like, which is difficult to measure accurately, it is very effective when used as the supply portion 30.

It should be noted that this modified example 1 may be used in the first embodiment shown in FIGS.

(Modification 2) FIG. 6 is a partial sectional view showing Modification 2 of the injection plunger of the injection unit according to the second embodiment.

That is, 221 is an injection plunger main body having the same outer shape as the injection plunger 22 shown in FIG. 4, and 241 is a cartridge heater.

Further, the injection plunger main body 221 is formed with a cylindrical space 222 so that the cartridge heater 241 can be fitted therein.

In the second embodiment, the rod-shaped cartridge heater 3 is provided in the concentric cylindrical space 222.
41 is inserted and the lead wire 242 is pulled out from the cartridge heater 241 and a temperature control unit (not shown)
To form an injection plunger 220 with a built-in heater.

Therefore, by controlling the temperature of the injection plunger body 221, not only the heat radiation is prevented but also
It is possible to positively melt the sealing material 36 and maintain the temperature of the molten sealing material 36b.

[0072]

As described above, according to claims 1 to 8.
According to the invention, the injection part and the die are directly connected to each other to form an integral structure, and the temperature control of the injection part is severely controlled, so that the good flowability of the melted sealing material is obtained and the filler is dispersed. In addition, the injection pressure is lowered, the sealing molding apparatus can be downsized, the installation area is reduced, and the cost can be reduced.

According to the ninth aspect of the present invention, since the supply cylinder forcibly supplying the sealing material is provided in the hopper, the sealing material such as granules, flakes, and powders, which are difficult to flow, is supplied. Has become more reliable and the weighing accuracy has improved.

According to the tenth aspect of the present invention, by mounting the supply assisting tool, the supply to the measuring section can be surely performed without the bridge being blocked at the inlet to prevent the inflow.

[Brief description of drawings]

FIG. 1 is an overall view showing a sealing injection molding device according to a first embodiment of the present invention.

FIG. 2 is a main-portion cross-sectional view showing the sealing injection molding device according to the first embodiment.

FIG. 3 is a main-portion cross-sectional view showing an injection state of the injection unit according to the first embodiment.

FIG. 4 is a cross-sectional view of essential parts showing a sealing injection molding apparatus according to Embodiment 2 of the present invention.

FIG. 5 is a cross-sectional view showing a modified example 1 of the portion shown in FIG. 4A.

6 is a partial cross-sectional view showing a modified example 2 of the injection plunger of FIG.

FIG. 7 is a schematic explanatory view of a sealing injection molding device according to a conventional technique.

[Explanation of symbols]

20 ... Sealing injection molding device 20A ... Fixing plate 20B ... moving plate 21 ... Injection part 22A ... Stirring injection plunger 22a ... Agitation injection plunger body 23 ... Injection cylinder 24 ... Injector heater 25 ... Vertical movement means 25A ... Rotating means 25B ... Spiral movement means 25e ... axis 40 ... Mold

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H01L 21/56 H01L 21/56 TF term (reference) 4F206 AD19 AH37 AL12 JA07 JB17 JD05 JF01 JQ31 JQ47 5F061 AA01 BA01 CA21 DA03 DA12 DA16 DE06

Claims (10)

[Claims] 1. A sealant stored in a hopper is supplied from a supply unit that supplies the sealant toward a metering unit, and the sealant, which is measured in a predetermined amount while being melted by the metering unit, is directed toward an injection unit by a metering plunger. A sealing injection molding device for injecting a sealing material, which is pushed in, melted and stirred at a predetermined temperature in the injection portion, toward a cavity through a runner of a mold by the operation of a stirring injection plunger, On the shaft connected to the stirring injection plunger main body of each part, each means of rotation / vertical movement and spiral movement is provided, and the injection cylinder is formed into a cylindrical elongated shape, and the injection part heater is mounted so as to surround it. A sealing injection molding apparatus, characterized in that the injection part, in which the stirring injection plunger is fitted in an injection cylinder, is assembled so as to be directly connected to the mold mounted between a fixed plate and a moving plate. . 2. The aforesaid means is rotated in a state where a stirring rod urged by a spring inserted into a hollow stirring injection plunger body and protruding is protruded from a lower side of the stirring injection plunger. Rotating operation to stir the sealing material and vertical movement operation to move the stirring injection plunger main body downward along the outer surface of the stirring rod to press and inject the sealing material and rotate to move downward while stirring. The three mechanical operations of the spiral dynamic operation of pressing and injecting are transmitted to the shafts connected to the stirring injection plunger via pulleys and belts, respectively, and driving of the rotation motor and the vertical movement motor is transmitted. The sealed injection molding apparatus according to claim 1, wherein the operation can be performed in a single action or a double action. 3. The sealing injection molding apparatus according to claim 1, wherein the stirring rod is provided with a plurality of protruding pieces on its outer surface. 4. A sealing part stored in a hopper is supplied from a supply part to a measuring part, and a sealing material, which is measured in a predetermined amount while being melted in the measuring part, is directed to an injection part by a measuring plunger. A sealing injection molding apparatus for injecting a sealing material, which has been heated by the injection section and melted to a predetermined temperature, into a cavity through a runner of a mold by the operation of the injection plunger. The vertical movement means is provided on the shaft connected to the main body, the injection cylinder is formed into a slender cylindrical shape, the injection part heater is mounted so as to surround the injection cylinder, and the injection part is inserted into the injection cylinder. A sealing injection molding apparatus, wherein the mold is mounted so as to be directly connected to the mold mounted between a fixed plate and a movable plate. 5. The vertical movement means is a vertical movement mechanism operation of lowering the injection plunger to press and inject a sealing material, and the vertical movement motor is driven by a injection belt main body via a pulley belt. The sealing injection molding apparatus according to claim 4, wherein the injection plunger is moved up and down by being transmitted to a shaft connected to the injection plunger. 6. A cartridge heater is inserted into the injection plunger body, and the cartridge heater is inserted into the injection plunger body.
The sealed injection molding apparatus described. 7. The sealed injection molding apparatus according to claim 1, wherein the injection plunger body is made of a material having a low thermal conductivity or a hollow body in order to reduce heat radiation. 8. The encapsulation injection molding apparatus according to claim 1, wherein the injection section heater is a casting heater. 9. A supply cylinder provided with an inlet for the sealing material is provided in the hopper, and a supply plunger is fitted in the supply cylinder to be connected to the measuring cylinder. 4. The sealing injection molding device according to 4. 10. The sealing injection molding apparatus according to claim 1, wherein a supply auxiliary tool is attached to the inside, the outside, or both of the hopper.