JPH09164530A - Sealing molding apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing molding apparatus capable of clamping a sealing mold under equal pressure and not generating molding inferiority. SOLUTION: A sealing molding apparatus 21 is constituted by providing a toggle link mechanism between a platen 25 and a table 24 and providing the ball screw 31 piercing the central part of the table 24 to protrude upwardly and connecting the toggle link mechanism to the traveling nut 31 threaded with the ball screw 31. The traveling nut 32 is moved up and down by rotating the ball screw 31 to operate the toggle link mechanism 26 to move the platen up and down. In this sealing molding apparatus 21, a holding means 27 holding a bearing 31a so as to prevent the falling of the ball screw 31 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an encapsulation molding apparatus for encapsulating a semiconductor or the like with a resin.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional example of this type. That is, in the sealing molding apparatus 1B shown in FIG. 5, the crown 2 and the bed 3B are tied together.
4, the platen 5 is slidably provided on the tie bar 4, and the lower die 11b is fastened to the upper surface of the platen 5 and the upper die 11a is fastened to the lower surface of the corresponding crown 2. And
A toggle link mechanism 7 is provided below the platen 5 as a movable means of the platen 5, and is connected to a drive means 8 such as a drive motor or a drive belt to form a platen drive mechanism 6B.

The toggle link mechanism 7 is composed of upper, middle, and lower toggle links 7c, 7d, and 7e around a movable wheel 7b screwed to a ball screw 7a, and each component is assembled by a hinge pin 7f. ing. This toggle link mechanism 7
Has a substantially H shape, and a middle toggle link 7d is attached to the left and right ends of the H-shaped horizontal one.
b is assembled. A screw is provided on the inner surface of the movable wheel 7b, and a ball screw 7a is screwed therein.
Further, as the driving means 8, a pulley 9c is provided below the ball screw 7a, and the pulley 9c is mounted on the shaft of the drive motor 8B fixed to the bed 3B via the drive belt 10. -Linked to 9d.

Therefore, when the drive motor 8B is rotated, the ball screw 7 is passed through the pulleys 9c and 9d and the drive belt 10.
As a rotates forward and backward, the movable wheel 7b moves up and down.
Then, one end of the movable wheel 7b is pin-connected, and the other end is connected to the upper and lower links 7c and 7e.
Results in pushing / pulling the connecting portion 7g with the upper / lower links 7c and 7e, and the platen 5 moves up and down by bending / extending of the upper / lower link connecting portion 7g, so that the mold clamping die of the resin molding die 11 can be opened. It is a drive mechanism 6B.

[0005]

However, in such a conventional device, the movable wheel 7b is shaken so that the ball screw 7a is deformed by the load being applied to the left and right by the movement of the left and right toggle links. .

Therefore, the movable wheel 7b is eccentrically worn, or the hinge pin 7f is apt to be worn due to a heavy load, and when minute vibrations are also generated, the wear is further accelerated and the crown 2 and the platen are accelerated. The parallelism with 5 deteriorated, and the mold clamping was not perfect, which was a cause of defective molding.

Therefore, the present invention is to provide a sealing and molding apparatus capable of clamping the sealing and molding die with a uniform pressure so as to prevent defective molding.

[0008]

In order to achieve the above object, the invention of a sealing molding apparatus according to claim 1 is such that a crown to which an upper mold is fastened is provided at an upper end portion of a tie bar,
A table is fastened in parallel to the lower end in parallel, a platen having a lower die fastened to the upper surface is slidably provided between the two, and a toggle link mechanism is provided between the platen and the table. A ball screw penetrating through the center of the table and protruding upward is provided, the toggle link mechanism is connected to the traveling nut screwed to the ball screw, and the ball screw is rotated to move the traveling nut up and down. Then, the toggle link mechanism is actuated to move the platen up and down.
A holding means for holding the bearing is provided so as to prevent the ball screw from falling.

In such a structure, the traveling nut, in which the ball screw is screwed without causing the shaft to tilt, moves up and down with high accuracy.

According to a second aspect of the present invention, in the sealing molding apparatus according to the first aspect, the holding means projects a plurality of support columns upward on the table and connects the support columns. While being connected by a member, a bearing provided at the upper end of the ball screw is fixed to the connecting member, and a guide bush connected to the traveling nut is slidably fitted to at least one of the plurality of columns. It is characterized by being.

In such a structure, since it is supported by a plurality of columns, it becomes a highly rigid holding means. Further, even if a large load is applied from the toggle link side, the guide post can prevent the tip from falling.

According to a third aspect of the present invention, a toggle link mechanism is provided between the platen and the table, and a ball screw nut penetrating the center of the table and protruding upward is screwed into the toggle link mechanism. A ball screw is provided, the tip of the ball screw is fixed to the connecting bar, the toggle link mechanism is connected from the connecting bar, and the ball screw nut is rotated to move the connecting bar up and down to move the toggle bar. In a sealing molding apparatus in which a link mechanism is operated to move the platen up and down, a plurality of columns are projected upward on the table, and the columns are connected by a connecting member, while the plurality of columns are connected to each other. A guide bush connected to the connecting bar is slidably fitted to at least one of the columns.

In such a structure, since the load from the toggle link side is received by the guide post supported by the plurality of columns, the ball screw is prevented from tilting.

According to a fourth aspect of the present invention, in the sealing molding apparatus according to the first to third aspects, an ejector rod for ejecting a molded product from the lower mold when the platen descends is provided on the connecting member. The feature is that it is provided.

In such a structure, the ejector mechanism can be provided without making a complicated mechanism.

According to a fifth aspect of the present invention, in the encapsulation molding apparatus according to the first to third aspects, a spacer is provided between the crown and the back surface of the upper mold, and the spacer contacts the upper mold and the lower mold. It is characterized in that it is formed so that the parallelism of the surfaces can be obtained.

In such a case, when the toggle ring mechanism is worn and the parallelism between the contact surfaces of the upper die and the lower die is lost, the spacer is processed to absorb the amount of wear. The parallelism can be maintained.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION

[0019]

Embodiment 1 of the present invention will be described below with reference to FIGS. 1 to 3.

FIG. 1 is a front view of the encapsulation molding apparatus, and FIG.
FIG. 3 is a side view of the same device. Further, FIG. 3 shows a toggle link mechanism of the same device as a perspective view.

First, this structure will be described with reference to FIGS.

1 and 2, the upper end 22a of the tie bar 22 has a crown 23 to which an upper die is fastened and a lower end 2
A platen 25, to which a table 24 is fixedly fastened in parallel and a lower die is fastened, is slidably provided on the 2b.

A holding means 27 is provided between the platen 25 and the table 24.

That is, as shown in FIG. 3, the holding means 27 has six columns 27 extending upward from the upper surface of the table 24.
a is provided, and the upper portions of the three columns 27a are connected to each other by an H-shaped connecting member 27b. The center column of each of the three columns 27a is provided with a sliding surface as a guide post 27c. A plurality of ejector rods are provided upward on the connecting member 27b.

A ball screw 31 is provided upward so as to pass through the center of the table 24. Bearings 31a are provided at both ends of this ball screw 31,
They are fixedly held by the table 24 and the connecting member 27b, respectively.

A traveling nut 32 is movably screwed into an intermediate portion of the ball screw 31,
The traveling nut 32 is provided with a connecting bar 32a in the front-rear direction and a fixed link 32b in the left-right direction, and the connecting bar 32a is connected to the guide bush 33 and fitted to the guide post 27c.

The fixed link 32b is a toggle link C.
26c, and the toggle link C26c is connected to the toggle links B, D 26b, 26d. The toggle link B26b is close to the center of the platen 25 so as to reduce the bending deformation of the platen 25, and the toggle link A2 fixed near the plunger drive unit 34.
6a. Also, toggle link D 26d
Is a toggle link E 26 fixed to the upper surface of the table 24.
connected to e.

As shown in FIGS. 1 and 2, the table 24
A drive mechanism 35 is provided on the lower surface of the.

That is, the ball screw 31 shaft passing through the table 24 is provided with a pulley 36, and the pulley 36 is connected via a belt 37 to a pulley 36a provided on a shaft of a drive motor 38 having a reduction gear.

A plunger drive mechanism 39 is provided on the lower surface of the platen 25. That is, the traveling nut 41 of the transfer ball screw 40 is fixed to the central portion of the lower surface of the platen 25, and the traveling nut 41 is provided with a concentric shaft pulley 42 on the lower surface side. A transfer motor 43 is mounted on the platen 25, and a pulley 42a is provided on the shaft of the transfer motor 43. The two pulleys 42, 42a are connected via a belt 44, and the transfer motor 43
The transfer ball screw 40 moves up and down by the rotation.

The stopper 40a comes into contact with the traveling nut 41 and stops when it reaches the upper limit.

Further, as shown in FIGS. 1 and 3, a position detecting device 45 is provided for detecting the vertical movement position of the platen 25.

Further, a mold 29 for sealing molding is provided between the platen 25 and the crown 23. A spacer 30 is provided between the upper die 29a and the crown 23 so as to be fastened to the crown 23 together with the upper die 29a.

Next, the operation will be described.

As shown in FIG. 1, a metal mold is clamped between the upper surface of the platen 25 and the lower surface of the crown 23, which correspond to each other, and sealing molding is performed.

First, the drive motor 3 which is the drive mechanism 35.
8, the ball screw 31 is rotated through the pulleys 36, 36a and the belt 37. The traveling nut 32 screwed to the ball screw 31 rises, the fixed link 32b integrally provided to the traveling nut 32 rises, and the toggle link C 26c is pushed out in the horizontal direction, so that the toggle links B, D 26b. , 26c rise in the vertical direction, and the platen 25 having the lower mold 29b is pushed up and clamped between the upper mold 29a and the lower mold 29a.

Then, when the mold is clamped, the transfer drive mechanism 39 provided on the side surface of the platen is then transferred.
Is activated, the transfer ball screw 40 rotates and rises, and pushes the plunger 29c in the mold 29 to move the cavity 29
A sealing resin is injected into d and cured. Then, the transfer ball screw 40 is reversely rotated and lowered to return the plunger to the original position to complete the sealing molding.

Subsequently, the drive mechanism 35 is reversely driven to pull down each toggle link of the toggle link mechanism 26. Therefore, the platen 25 to which the lower mold 29b is fastened
Moves down, and the molded product on which the ejector rod 28 provided on the connecting member 27b is formed is released from the mold.

By repeating this operation, the production of the sealing molding can be performed.

[0040]

Embodiment 2 of the present invention is shown in FIG.
Based on FIG. 2 and FIG. 4, the difference from the first embodiment will be described with the same reference numerals for the same functions.

In the figure, 27b is a connecting member, and the connecting member 2
7b are six columns 27a from the upper surface of the table 24 in the upward direction.
Is provided, and the upper portions of the three columns 27a are connected to each other by separate connecting members 27b. The center column of each of the three columns 27a is provided with a sliding surface as a guide post 27c. Further, the connecting member 27b is provided with a plurality of ejector rods 28.

Further provided is a ball screw 31 penetrating through the central portion of the table 24 and protruding upward, and a ball screw nut 32c is screwed into the ball screw 31, and the tip end of the ball screw 31 is fixed to the connecting bar 32a. The toggle link mechanism 26 is connected by the connecting bar 32a.

The ball screw nut 32c is rotatably provided on the table 24, and the pulley 3 of the drive mechanism 35 is provided.
6 is connected by a shaft so as to be interlocked with the rotation of the pulley 36.

Therefore, the drive motor 3 which is the drive mechanism 35.
8, the ball screw nut 32c is rotated through the pulleys 36, 36a and the belt 37. The ball screw 31 is raised by the rotation of the ball screw nut 32c which is screwed, and the connecting bar 32a fixed to the ball screw 31 is raised and the toggle link C 26c is pushed out in the horizontal direction, so that the toggle links B and D are released. 26b and 26c rise in the vertical direction, and the platen 25 having the lower die 29b is pushed up and clamped between the upper die 29a and the lower die 29a.

When the sealing molding is completed, the driving mechanism 35
Is reversely driven to pull down each toggle link of the toggle link mechanism 26. Therefore, the platen 25 to which the lower mold 29b is fastened is lowered, and the molded product on which the ejector rod 28 provided on the connecting member 27b is formed is released from the mold.

By repeating this operation, sealing molding is produced.

The other functions and actions are the same as those in the first embodiment, and the description thereof will be omitted.

[0048]

Since the present invention is configured as described above, it has the following effects.

According to the first aspect of the present invention, by providing the holding means, the ball screw can be prevented from falling down and uneven wear is less likely to occur together with the traveling nut screwed with the ball screw.

Therefore, the vertical movement can be performed accurately, uniform pressure can be formed, and the defective rate can be reduced. According to the second aspect of the invention, the ball screw is supported by the highly rigid holding means supported by the plurality of columns, and since the traveling nut is supported by the guide post, a large force is applied from the toggle link side. However, since the platen, which is prevented from being deformed and is fastened to the die with high precision, is movable, it is possible to form an even pressure in the die and prevent defective molding.

According to the third aspect of the present invention, since the load from the toggle link side is received by the guide post supported by the plurality of columns, the ball screw smoothly moves up and down without causing the shaft to tilt. Therefore, wear is reduced and the life of the device is extended.

According to the fourth aspect of the present invention, if the ejector rod is simply provided on the connecting member of the holding means at the lower part of the platen and the platen descends, the platen penetrates the platen to activate the ejector portion (not shown) of the die. The ejector function can be provided without providing a complicated mechanism. Therefore, an inexpensive structure can be obtained.

According to the fifth aspect of the present invention, the amount of wear can be offset and parallelism can be secured by simply cutting the spacer, and an expensive die can be cut in accordance with poor precision of the molding apparatus. It is not necessary to perform shim adjustment every time the mold is mounted, and therefore, the number of man-hours for mounting the mold can be reduced. In addition, since uniform pressure molding can be performed, defective molding can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view of a sealing and molding apparatus showing Embodiments 1 and 2 of the present invention.

FIG. 2 is a view taken in the direction of arrow A in FIG. 1;

FIG. 3 is a perspective view of a portion B of FIG.

FIG. 4 is a perspective view of a B part showing the second embodiment of FIG. 1.

FIG. 5 is a schematic view of a sealing molding apparatus showing a conventional example.

[Explanation of symbols]

 21 ... Sealing molding device 22 ... Tie bar 23 ... Crown 24 ... Table 25 ... Platen 26 ... Toggle link mechanism 27 ... Holding means 27a ... Strut 27b ... Connecting member 28 ... Ejector rod 29 ... Mold 30 ... Spacer 31 ... Ball screw 31a … Bearing 32… Traveling nut 32c… Ball screw nut

Claims (5)

[Claims] 1. A crown, to which an upper mold is fastened, is fixed to an upper end portion of a tie bar, and a table is fixed to a lower end portion in parallel.
A platen having a lower mold fastened to the upper surface is slidably provided between the two, and a toggle link mechanism is provided between the platen and the table, and penetrates through the center of the table to project upward. A ball screw is provided, and the toggle link mechanism is connected to a traveling nut screwed to the ball screw,
By rotating the ball screw, the traveling nut is moved up and down to operate the toggle link mechanism, and the platen is moved up and down, in order to prevent the ball screw from falling. An encapsulation molding apparatus comprising a holding means for holding a bearing. 2. The holding means comprises a plurality of support columns projecting upward from the table, the support columns being connected by a connecting member, and a bearing provided at an upper end portion of the ball screw being connected to the connecting member. The encapsulation molding apparatus according to claim 1, wherein a guide bush connected to the traveling nut is slidably fitted to at least one of the plurality of struts while being fixed to the. 3. A toggle link mechanism is provided between the platen and the table, and a ball screw having a ball screw nut penetrating through the center of the table and protruding upward is provided, and the ball screw is provided. The tip end of the connection bar is connected to the connection bar, the toggle link mechanism is connected from the connection bar, and the ball screw nut is rotated to move the connection bar up and down to operate the toggle link mechanism to move the platen. In a sealing molding apparatus configured to move up and down, a plurality of support columns are provided on the table so as to project upward, and each support column is connected by a connecting member, and at least one of the plurality of support columns is connected to the connection bar. An encapsulation molding apparatus, wherein a guide bush connected to the fitting unit is slidably fitted. 4. The encapsulation molding apparatus according to claim 1, further comprising an ejector rod for ejecting a molded product from the lower mold when the platen descends, the ejector rod being provided on the connecting member. 5. A spacer is provided between the crown and the back surface of the upper mold, and is formed so that the contact surface between the upper mold and the lower mold can be parallelized. The encapsulation molding apparatus according to.