JPH0584766A - Mold device - Google Patents

Abstract

PURPOSE:To provide the title device enhanced in cleaning properties and maintenance properties, reduced in its size in a vertical direction as a whole and capable of performing molding of high accuracy. CONSTITUTION:Both of a mold driving mechanism and a molding material pushing-in mechanism are set to an electromotive type driven by a motor and a mold driving nut 39 is provided in a lower plate 31. The lower part of a mold driving ball screw 48 is allowed to protrude downwardly through the lower plate 31 having a pulley 43 or a belt 45 arranged thereto. Further, the mold driving ball screw 48 is formed into a hollow shape and a molding material pushing-in ball screw is inserted in the screw and a molding material pushing-in nut is provided to the rotary shaft of a molding material pushing-in motor or in coaxial relation thereto corresponding to the central part of a lower mold 38.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding apparatus used for resin-sealing semiconductor parts, for example.

[0002]

2. Description of the Related Art Conventionally, as this type of molding apparatus, the one shown in FIG. 4 has been provided.

In this device, a tie bar 2 is erected on a lower plate 1, a moving plate 3 is vertically movably fitted to the tie bar 2, and an upper plate 4 is fixedly provided on an upper end portion of the tie bar 2. Has been. Further, the upper plate 4 is provided with an upper die 5 on the lower surface thereof, and the moving plate 3 is provided with a lower die 6 on the upper surface thereof.

On the lower plate 1, there are provided, for example, two die driving hydraulic cylinders 7, which push up the moving plate 3 from the state shown in the drawing to lower the die 6.
Is pressed against the upper mold 5 to clamp the mold.

A plunger 8 is provided in the lower die 6, and the plunger 8 is pushed up by a hydraulic cylinder 9 for pushing the molding material provided in the central portion of the lower surface of the moving plate 3.
A mold material (softening resin) is pushed into the cavity of the mold composed of the lower mold 6 and the upper mold 5.

By the way, semiconductor parts are manufactured in a clean environment, and in recent years, in order to correspond to the cleanliness and to improve the maintainability, in recent years, the hydraulic cylinders 7, for driving the mold and pushing the molding material are used. 9
Instead of the above, conversion to an electric type in which a motor is used as a drive source is attempted.

FIG. 5 shows the mold driving mechanism,
It shows the one that has been converted to the electric type.

In this case, a moving plate 13 is vertically movably fitted to a tie bar 12 provided upright on the lower plate 11, and a nut 14 is connected under the moving plate 13 by a tubular connecting body 15. Are provided. Further, the ball screw 16 is mounted on the lower plate 11 with the bearings 17, 18, 1
The ball screw 16 is rotatably supported by the ball screw 9 and is erected. The nut 14 is screwed to the ball screw 16. on the other hand,
A pulley 20 is attached to a lower end portion of the ball screw 16 protruding below the lower plate 11 by a lock nut 21, and a belt 22 is hung on the pulley 20 and is rotated by a belt 22 from a die driving motor (not shown). Driving force is applied.

Therefore, in this case, the pulley 2 is driven by the die driving motor (not shown) via the belt 22.
The ball screw 16 is rotated integrally with 0, and by the rotation of the ball screw 16, the nut 14 is screwed back and forth along the ball screw 16 to move the moving plate 13 up and down through the tubular connecting body 15. The mold is clamped and the mold is opened.

[0010]

The invention is not limited to the above,
In order to ensure good workability of this type of molding apparatus, it is desirable that the overall size in the vertical direction be kept small.

However, according to the above-mentioned one, it is necessary to secure a space between the lower plate 11 and the moving plate 13 which is longer than the length A of the nut 14 in which the nut 14 fits. The vertical size had become large.

Further, from the nut 14, the ball screw 16 has a stroke larger than the vertical movement of the moving plate 13 (dimension B).
It is necessary to project, and it is necessary to secure a space corresponding to the space between the lower plate 11 and the moving plate 13, so that the overall size in the vertical direction is further increased.

In addition, it is necessary to provide an electric mold material pushing mechanism in the above-mentioned apparatus, and if it is provided with a ball screw mechanism similar to the above, another ball screw is provided on the extension of the ball screw 16. As a result, it is necessary to secure the space, and the size in the vertical direction of the whole becomes even larger.

On the other hand, the movable plate 13 (lower mold) must be moved in a correct posture in order to perform a highly accurate mold that does not cause defects such as flash.

However, according to the above, when the electrically driven molding material pushing mechanism is provided by the ball screw mechanism similar to the above, the drive motor is generally separated from the ball screw and biased to one of the moving plates 13. Since the movable plate 13 is provided at a position, an eccentric load is applied to the movable plate 13 and the posture thereof deteriorates, so that the above-described highly accurate mold cannot be performed.

The present invention has been made in view of the above circumstances. Therefore, a first object of the present invention is to provide an electric motor drive which is cleaner and has improved maintainability, and has an overall vertical size. A second object of the present invention is to provide a molding apparatus that is also of an electrically driven type and that can perform high-precision molding.

[0017]

In order to achieve the above-mentioned first object, in the molding apparatus of the present invention, the movable mold is moved on the base and pressed against the other mold, and the mold is clamped. A mold driving nut that is molded by pushing a mold material into a clamped mold and is installed in the above-mentioned base and receives a rotational driving force from a mold driving motor. And a mold driving ball screw which is screwed in and screwed forward and backward by the rotation of the mold driving nut to reciprocate the movable mold.

Further, also in order to achieve the first object,
In the molding apparatus of the present invention, in the above configuration,
Further, the die driving nut is adapted to receive the rotational driving force from the die driving motor by the transmission mechanism arranged below the base, and the die driving ball screw is attached to the base of the anti-movable portion. It is characterized in that it is provided so as to project downward.

Further, in order to achieve the first object, in the molding apparatus of the present invention, the movable mold is moved on the base and pressed against the other mold to clamp the mold, and the mold is clamped in the mold. In a mold in which a molding material is pushed in and molded, a mold driving nut to which a rotation driving force is given from a mold driving motor and a screw which is screwed into the mold driving nut and is rotated by the rotation of the mold driving nut. A hollow mold driving ball screw that advances and retreats to move the movable mold back and forth, a mold material pressing ball screw inserted in the mold driving ball screw, and a mold material pressing ball screw are screwed back and forth. A nut for pushing the molding material,
A molding material pushing motor for rotationally driving the molding material pushing nut is provided.

In order to achieve the second object, in the molding apparatus of the present invention, the movable mold is moved on the base and pressed against the other mold to clamp the mold, and the mold is clamped in the mold. In the one in which the molding material is pushed in to mold, a molding material pushing nut for rotating and retracting the molding material pushing ball screw by being given a rotational driving force from the molding material pushing motor is provided at the center of the movable mold. It is characterized in that it is provided so as to correspond to the part and be provided in the same body as or coaxial with the rotary shaft of the motor for pushing the molding material.

[0021]

Among the above-mentioned means, in the case where the base for driving is provided with the mold driving nut for receiving the rotational driving force from the mold driving motor and screwing the mold driving ball screw back and forth, the base is mounted on the base. It is not necessary to secure a space in which the die driving nut is located, and the vertical size of the whole can be reduced accordingly.

Further, the anti-movable mold portion of the mold driving ball screw is provided so as to project below the base on which a transmission mechanism for giving the rotational driving force from the mold driving motor to the mold driving nut is arranged. In this case, the space below the base, which is secured for replacement of the transmission mechanism parts, can be effectively used as a space for accommodating the protruding portion of the mold driving ball screw. There is no need to secure a space for accommodating the protruding portion of the screw, and this also makes it possible to reduce the overall size in the vertical direction.

Further, in the case where the mold driving ball screw is formed in a hollow shape and the mold material pressing ball screw is inserted into the mold driving ball screw to advance and retreat, both ball screws can be arranged in a stack. It is not necessary to secure a space on the base for arranging them on the extension of each other, and this also makes it possible to reduce the overall size in the vertical direction.

A molding material pressing nut for screwing the molding material pressing ball screw back and forth is provided so as to correspond to the central portion of the movable mold and is attached coaxially with the rotary shaft of the molding material pressing motor. In the thing, the motor for pushing the mold material can also be provided corresponding to the central part of the movable mold, and it is possible to avoid applying an unbalanced load to the movable mold,
Molding can be performed while maintaining the correct posture of the movable mold.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

First, in FIG. 1, the lower plate 3 as a base is shown.
1 is shown below, and a space 33 having a dimension C from the floor surface 32 is secured below it by legs not shown. On the other hand, a tie bar 34 is placed on the lower plate 31.
Are provided upright at four corners, a moving plate 35 is fitted on the tie bar 34 so as to be vertically movable, and an upper plate 36 is fixedly provided at an upper end portion. Further, the upper plate 36 is provided with an upper die 37 on the lower surface thereof, while the moving plate 35 is provided with a movable lower die 38 on the upper surface thereof. in this case,
The lower die 38 is provided with its center portion aligned with that of the moving plate 35.

A die driving nut 39 is rotatably supported by bearings 40, 41 and 42 in the center of the lower plate 31, and is installed inside. Further, the pulley 43 is attached by the bolts 44, the belt 45 is placed on the pulley 43 under the lower plate 31, and the belt 45 applies a rotational driving force from a die driving motor (not shown).

On the other hand, a connecting member 46 is provided at the center of the lower surface of the moving plate 35.
Mold drive ball screw 48 attached to the
Is screwed into the mold driving nut 39, and the lower part, which is an anti-movable mold part, is projected below the lower plate 31.

Here, as shown in FIG.
6 and the ball screw 48 for driving the mold are both hollow. Of these, a molding material pushing motor 49 is disposed in the center of the connecting body 46. In this molding material pushing motor 49, a molding material pushing nut 50 is provided in the same body as the rotary shaft thereof, and a molding material pushing ball screw 51 is screwed into the molding material pushing nut 50, The lower part protruding downward is inserted into the mold driving ball screw 48 so as to be vertically movable. On the other hand, a mold material pressing plunger 52 is attached to the upper part of the mold material pressing ball screw 51 protruding upward from the mold material pressing nut 50. or,
With respect to the mold material pushing plunger 52, a guide portion 53 for guiding the mold material pushing plunger 52 in the vertical direction while restraining the mold material pushing plunger 52 in a non-rotatable manner is provided in the connecting body 46.

In the case of the above structure, the mold driving motor (not shown) rotates the mold driving nut 39 integrally with the pulley 43 via the belt 45, and the rotation of the mold driving nut 39 drives the mold. Since the ball screw 48 is screwed back and forth and moves up and down, the moving plate 35 is also moved up and down via the connecting body 46, and by the ascending movement, the lower die 38 is pressed against the upper die 37 which is a mating die to perform die clamping. .. On the contrary, the lower mold 38 is separated from the upper mold 37 by the downward movement to open the mold.

With the mold clamped, the molding material pushing motor 49 drives the molding material pushing nut 5 to move.
When 0 is rotated, the ball screw 51 for pushing the molding material is also screwed back and forth to move up and down.
The mold material pushing plunger 52 is pushed up, and the mold material (softening resin) is pushed into the cavity of the mold formed by the lower mold 38 and the upper mold 37. On the contrary, by downward movement, the mold material pushing plunger 52 is pulled down and returned to the original position. Then, at this time, the lower portion of the ball screw 51 for pushing the molding material moves up and down in the ball screw 48 for driving the mold.

As described above, in this structure, the die drive mechanism and the mold material pushing mechanism are electrically driven by the ball screws 48 and 51 using the motor as a drive source, respectively. It is possible to improve the cleanliness and maintainability as compared with those described above.

Further, a die driving nut 39 which is given a rotational driving force from the die driving motor to advance and retract the die driving ball screw 48 is provided inside the lower plate 31 (base). Therefore, it is not necessary to secure a space where the die driving nut 39 is located on the lower plate 31, and the overall size in the vertical direction can be reduced accordingly.

Further, a pulley 43 and a belt 45, which are a transmission mechanism for applying a rotational driving force from the mold driving motor to the mold driving nut 39, are arranged on the lower part of the mold driving ball screw 48 which is an anti-movable mold part. Since it is provided so as to protrude below the lower plate 31, the pulley 43 and the belt 4
5, particularly, the space 33 below the lower plate 31 which is secured for replacement of the belt 45, which is often worn, accommodates the above-mentioned protruding portion of the mold driving ball screw 48, which is required for the vertical stroke of the moving plate 35 or more. It can also be effectively used as a space, and it is not necessary to secure a space for accommodating the protruding portion of the die driving ball screw 48 on the lower plate 31. This also reduces the overall size in the vertical direction. be able to.

Further, since the mold driving ball screw 48 is formed in a hollow shape and the mold material pressing ball screw 51 is inserted into the mold driving ball screw 48 and moved up and down, both ball screws 48 are provided. , 51 can be stacked and a space for arranging them on the extension of each other is provided on the lower plate
Since it is not necessary to secure it on 1,
The overall vertical size can be reduced.

Since the overall size in the vertical direction can be reduced in this way, the workability of the molding apparatus can be ensured satisfactorily.

On the other hand, the ball screw 51 for pushing the molding material
Since the molding material pushing nut 50 for screwing back and forth is provided in the same body as the rotating shaft of the molding material pushing motor 49 corresponding to the central portion of the lower die 38 (movable die), the molding material pushing motor 49 Can also be provided corresponding to the central portion of the lower mold 38. Therefore, it is possible to avoid applying an unbalanced load to the lower mold 38, and it is possible to perform molding while maintaining the posture of the lower mold 38 correctly. It is possible to perform high-precision molding without causing defects.

In contrast to the above, FIG. 3 shows a different embodiment of the present invention, in which the nut 54 for pushing the molding material is provided separately from the rotary shaft 55 of the motor 49 for pushing the molding material coaxially. The same balance effect as described above can be obtained even in this case.

In addition, the present invention is not limited to the embodiment described above and shown in the drawings. Particularly, as a transmission mechanism for applying the rotational driving force from the die driving motor to the die driving nut 39. Other than the pulley 43 and the belt 45, for example, a plurality of combined gears may be used, and various modifications may be made without departing from the scope of the invention.

[0040]

The present invention is as described above,
It has the following effects.

In the molding apparatus of claim 1, the movable mold is moved on the base and pressed against the other mold to perform mold clamping, and the mold material is pushed into the mold to mold. And a mold driving nut which is installed in the base and receives a rotational driving force from a mold driving motor, and a mold driving nut which is screwed into the mold driving nut and is screwed forward and backward by the rotation of the mold driving nut. By having a ball screw for driving the die that reciprocates the die,
Not only can the cleaning be improved and the maintainability can be improved, but also the size in the vertical direction of the whole can be reduced, so that the workability can be favorably ensured.

According to a second aspect of the present invention, there is provided the molding apparatus according to the second aspect, further comprising a die driving nut, which receives a rotational driving force from a die driving motor by a transmission mechanism arranged below the base. By providing the mold driving ball screw such that the anti-movable mold portion projects below the base, cleanliness and maintainability can be improved, and at the same time, the overall structure can be improved. The size in the vertical direction can be made much smaller, and good workability can be ensured.

In the molding apparatus of claim 3, the movable mold is moved on the base and pressed against the other mold to perform mold clamping, and the mold material is pushed into the mold to mold. A mold driving nut to which a rotational driving force is applied from a mold driving motor, and a hollow shape which is screwed into the mold driving nut and is screwed back and forth by the rotation of the mold driving nut to reciprocate the movable mold. For driving the mold, the ball screw for pushing the mold material inserted in the ball screw for driving the mold, the nut for pushing the mold material for pushing the ball screw for pushing the mold material, and the nut for pushing the mold material. By having a motor for pushing the molding material that rotates the pushing nut, it is possible to achieve cleanliness and maintainability. Above, it can be made smaller overall size of the vertical direction, to better ensure the workability.

In the molding apparatus of claim 4, the movable mold is moved on the base and pressed against the other mold to clamp the mold, and the mold material is pushed into the mold for molding. There is a mold material pressing nut for rotating and retracting the mold material pressing ball screw when a rotational driving force is applied from the mold material pressing motor. Since the movable mold can be moved in the correct posture by providing the same as or coaxial with the rotary shaft of the motor, a highly accurate mold can be performed without causing defects such as flash.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention.

FIG. 2 is an enlarged vertical sectional view mainly of a molding material pushing mechanism portion.

FIG. 3 is a view corresponding to FIG. 2 showing a different embodiment of the present invention.

FIG. 4 is a view corresponding to FIG. 1 showing a conventional example.

FIG. 5 is an enlarged view corresponding to FIG. 1 showing a different conventional example.

[Explanation of symbols]

31 is a lower plate (base), 37 is an upper mold (mating type), 3
8 is a lower die (movable die), 39 is a die driving nut, 44 is a pulley (transmission mechanism), 45 is a belt (transmission mechanism), 48 is a die driving ball screw, 49 is a molding material pushing motor, and 50 is A molding material pushing nut, 51 is a molding material pushing ball screw, 54 is a molding material pushing nut, and 55 is a rotating shaft.

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Claims (4)

[Claims] 1. A movable mold is moved on a base and pressed against a mating mold to clamp the mold, and a mold material is pushed into the mold that has been clamped for molding. A mold driving nut that is internally installed in the mold and is given a rotational driving force from a mold driving motor, and a mold drive that is screwed into the mold driving nut and is moved forward and backward by the rotation of the mold driving nut to reciprocate the movable mold. And a ball screw for use in molding. 2. A mold driving nut receives a rotational driving force from a mold driving motor by a transmission mechanism arranged below the base, and a mold driving ball screw moves the anti-movable mold portion to a base of the base. The molding apparatus according to claim 1, wherein the molding apparatus is provided so as to project downward. 3. A mold is driven by moving a movable mold on a base and pressing it against a mating mold, and pressing a mold material into the mold that has been clamped for molding. A mold driving nut to which a rotational driving force is applied from a motor, and a hollow mold driving screw that is screwed into the mold driving nut and is screwed back and forth by the rotation of the mold driving nut to reciprocate the movable mold. A ball screw, a ball screw for pushing the mold material inserted into the ball screw for driving the mold, a nut for pushing the mold material for screwing the ball screw for pushing the mold material, and a nut for pushing the mold material in rotation. A molding apparatus, comprising: a molding material pushing motor. 4. A mold is clamped by moving a movable mold on a base and pressing it against a mating mold, and the mold material is pushed into the mold that has been clamped for molding. A molding material pressing nut that is given a rotational driving force from a driving motor to screw the molding material pressing ball screw back and forth, in correspondence with the central portion of the movable mold, and the same as the rotating shaft of the molding material pressing motor or A molding device characterized by being installed coaxially with it.