JPH04347608A - Transfer molding machine - Google Patents

Abstract

PURPOSE:To obtain the sufficient mold clamping pressure and also to prevent moldings from being dirtied due to oil without deteriorating durability. CONSTITUTION:A table 4 is freely supported to the upper part of a base 1 via the rods 3 with permitted vertical movement. The table 4 is elevated and driven via a ball screw 21, and a nut 25 by a motor 20. A rotary disk 31 is freely rotatably provided on the base 1. A first supports 41 are downward projected on the table 4. A second supports 42 are upward projected on the rotary disk 31. Both the first supports 41 and the second supports 42 are alternately made parallel in the horizontal direction at a mold opening time and aligned in the vertical direction and mutually collide at a closing time. The supporting member 5 of a bottom force is elevated and driven for the table 4 by a hydraulic cylinder device 51. Thereby amount of oil in the device 51 is reduced. Sufficient mold clamping force is generated by the device 51. The ball screw 21, resists the mold clamping pressure by the help of the supports 41, 42.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer molding machine, and more particularly to a mold clamping device thereof.

0002

[Prior Art] For example, in the resin packaging of IC chips, transfer molding is performed using a thermosetting resin. It is equipped with a mold clamping device that opens and closes the mold by moving the mold vertically, and a transfer device that transfers the resin to the cavity formed in the mold in the mold clamped state. . In the mold clamping device, for example, an upper mold mounting plate to which an upper mold is attached is fixed to the upper end of a rod erected on a base, and a lower mold mounting plate to which a lower mold is attached is fixed to an intermediate position of the rod. A mold mounting plate is supported so as to be movable in the vertical direction, and the mold is clamped by raising this lower mold mounting plate. In the conventional mold clamping device, the lower mold mounting plate is driven vertically by a hydraulic cylinder device over its entire stroke. However, if the lower mold mounting plate is driven throughout its entire stroke by a hydraulic cylinder device,
The amount of oil used in hydraulic cylinder devices increases, and as the amount of oil increases, there is a greater possibility that molded products will be contaminated by leaked oil. This is a particular problem in molded products such as IC chips where staining is undesirable.

[0003] Therefore, for example, it is conceivable to drive the lower mold mounting plate by an electric motor via a ball screw mechanism. However, it is difficult to generate sufficient mold clamping pressure using only the ball screw mechanism, and if an attempt is made to increase the mold clamping pressure, there is a possibility that the mold clamping pressure cannot be withstood.

0004

[Problems to be Solved by the Invention] In the mold clamping device of the conventional transfer molding machine, the lower mold mounting plate was driven by a hydraulic cylinder device over its entire stroke, so leaked oil caused molded products to be damaged. There was a problem in that there was a greater risk of contamination. On the other hand, even if the lower mold mounting plate is driven, for example, by an electric motor via a ball screw mechanism, it is difficult to generate sufficient mold clamping pressure, and if you try to increase the mold clamping pressure, this mold clamping pressure A problem arises in that there is a possibility that it will not be tolerated. SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and provide a transfer molding machine that can prevent molded products from being contaminated, provide sufficient mold clamping pressure, and have excellent durability.

[0005]

[Means for Solving the Problems] In order to achieve the above-mentioned object, the transfer molding machine of the present invention moves the lower mold of a mold consisting of an upper mold and a lower mold in the vertical direction. In a transfer molding machine, the mold clamping device includes a mold clamping device that performs mold opening and clamping operations of the mold, and a transfer device that transfers resin to a cavity formed in the mold in the mold clamping state. , a base, an upper mold support member provided above the base, a table supported movably in the vertical direction between the base and the upper mold support member, and moving the table in the vertical direction. a table drive mechanism; a first support provided on one of the base and the table so as to protrude toward the other; a rotary body provided on the rotary body so as to protrude toward one of the base and the table, and a first support that moves between a position in which it is vertically aligned with the first support and a position in which it is out of alignment with the first support as the rotary body rotates; 2 supports, a lower mold support member that is supported movably in the vertical direction above the table and supports the lower mold from below, and a lower mold support member that is provided between the table and the lower mold support member and that is attached to the table. On the other hand, it is equipped with a cylinder device that moves the lower mold support member in the vertical direction.

[0006]

[Operation] With the above structure, when transfer molding is performed by supporting the upper mold on the upper mold support member and supporting the lower mold on the lower mold support member, the table is placed against the base before mold clamping. is lowered, and the first support and the second support are located side by side in the horizontal direction. During mold clamping, the table is first raised relative to the base by the drive of the table drive mechanism, and then the rotating body rotates to align the first support and the second support in the vertical direction, and then,
The lower mold support member is raised relative to the table by driving the cylinder device, and the lower mold is pressed against the upper mold with sufficient mold clamping pressure. At this time, the first support and the second support, which are aligned in the vertical direction, come into contact with each other and receive mold clamping pressure. Then, in the mold-clamped state, the resin is transferred to a cavity formed in the mold by a transfer device. In addition, when opening the mold, conversely, after the lower mold support member is lowered relative to the table by the drive of the cylinder device, the rotating body rotates and the first support and the second support are separated, and the table drive mechanism is driven. As the table is lowered relative to the base, the lower mold is separated from the upper mold.

[0007]

Embodiments Hereinafter, embodiments of the present invention will be explained in detail with reference to the accompanying drawings. 1 to 3 show an embodiment of the transfer molding machine of the present invention. In these figures, 1 is a base, and 2 is an upper mold supporting member located above the base 1. With the mounting plate, these base 1
and the upper mold mounting plate 2 are connected and fixed by four rods 3. A table 4 is supported on these rods 3 so as to be movable in the vertical direction between the base 1 and the upper mold mounting plate 2.
A lower mold support member 5 is supported on the top so as to be movable in the vertical direction. The upper mold mounting plate 2 has the upper mold 6 attached to its lower side, and the lower mold support member 5 has the lower mold 7 attached to its upper side and supports it from below. . A mold cavity 8 is formed between the upper mold 6 and the lower mold 7 in a clamped state. Further, a shot cavity 9 communicating with the mold cavity 8 is formed vertically through the lower mold 7 . A mold clamping device 11 is provided from the base 1 to the table 4 for opening and clamping the molds 6 and 7 by moving the lower mold 7 in the vertical direction. Further, the lower mold support member 5 includes a mold cavity 8 from the shot cavity 9.
A transfer device 12 is provided to transfer the resin to.

The mold clamping device 11 has a table drive mechanism 13 that moves the table 4 in the vertical direction. First, the table drive mechanism 13 will be explained. A support shaft 16 is rotatably supported through the base 1 by a bearing 17 with the vertical direction being the axis of rotation, and a pulley 18 is fixed to the lower end of the support shaft 16. Further, an electric servo motor 20 is fixed to the outer circumference of the base 1 via a bracket 19, and a pulley 22 is fixed to an output shaft 21 of the motor 20.
An endless belt 23 is provided between the pulley 18 of the support shaft 16 and the
is being passed over. A ball screw 24 is integrally and coaxially provided on the upper part of the support shaft 16. On the other hand, a nut 25 is fixed to the lower side of the table 4 via a support member 26 and a bolt 27, and the ball screw 24 is screwed into this nut 25. In this way, the spindle 16 and the ball screw 24 are rotationally driven by the motor 20, and the table 4 is moved up and down together with the nut 25 accordingly. Further, on the base 1, a rotating disk 31, which is a rotating body, is mounted on a support shaft 1.
It is rotatably supported coaxially with 6. A thrust bearing 32 is interposed between the rotating disk 31 and the base 1, and a radial bearing 33 is interposed between the rotary disk 31 and the support shaft 16. It is also rotatable. Also, a plurality of push-up pins 35 are incorporated into the base 1, each of which is urged upward by a spring 34 and hits the rotating disk 31 from below. Furthermore, an air cylinder device 36 is provided on the outer periphery of the base 1, and a rack 38 fixed to the piston rod 37 of the air cylinder device 36 is fixed to the outer periphery of the rotating disk 31. It meshes with pinion 39. In this way, the air cylinder device 36 causes the rotary disk 3 to
1 is rotatably driven. Further, on the lower surface of the table 4, a plurality of cylindrical first supports 41, for example six, located on one circumference around the rotation axis of the rotary disk 31 are fixed and protruded downward. These first supports 41 have a diameter smaller than the spacing between them. On the other hand, on the upper surface of the rotary disk 31, a plurality of cylindrical second supports 42, for example six, are arranged upwardly on the rotation axis of the rotary disk 31 and located on a circumference having the same diameter as the circumference. It is fixed in a protruding manner. These second supports 42 have the same arrangement pitch and diameter as the first supports 41, and move between positions where they are vertically aligned with the first supports 41 and positions where they are out of alignment with the rotation of the rotating disk 31. It looks like this. Furthermore, a lower push-up pin 43 is provided protrudingly on the rotating disk 31. On the other hand, an upper push-up pin 44 is passed through the table 4 and the lower mold support member 5 so as to be movable up and down, and when the mold is opened, the lower push-up pin 44
3, the upper push-up pin 44 is pushed up a little, and the molded product ejection pin 45, which is vertically movably penetrated through the lower mold 7, is pushed up slightly by the upper push-up pin 44. The lower mold support member 5 is composed of a plurality of plate materials stacked in the vertical direction, and a lower mold mounting plate 47 supported movably in the vertical direction by the rod 3 is fixed on the spacer 46. ing. A plurality of thin hydraulic cylinder devices 51 are provided on the top of the table 4, and these hydraulic cylinder devices 5
1, the piston rod 52 that moves up and down is connected to the lower mold support member 5.
is in contact with the lower surface of the spacer 46. In this way, the lower mold support member 5 is driven in the vertical direction with respect to the table 4 by the hydraulic cylinder device 51. Further, a plurality of springs 54 are incorporated in the table 4 to urge the lower mold support member 5 downwardly with respect to the table 4 via bolts 53 fixed to the spacer 46.

Next, the transfer device 12 will be explained. A nut 61 is supported within the lower mold support member 5 so as to be rotatable only with the vertical direction as the axis of rotation, and a ball screw 62 is screwed into the nut 61. This ball screw 62 is prevented from rotating relative to the lower mold support member 5 by a key. And ball screw 6
A shot cavity 9 of the lower mold 7 is provided at the upper end of the mold 2.
A plunger 64 is integrally fitted therein so as to be slidable in the vertical direction. Further, an electric servo motor 66 is fixed to the outer circumference of the lower mold mounting plate 47 via a bracket 65, and a pulley 68 fixed to the output shaft 67 of this motor 66 and the nut 61 are fixed to the outer periphery of the lower mold mounting plate 47. An endless belt 70 is stretched between the pulley 69 and the pulley 69. In this way, the nut 61 is rotated by the drive of the motor 66, and the plunger 64 is moved in the vertical direction together with the ball screw 62.

Next, the operation of the above structure will be explained. The transfer molding machine is used, for example, for resin packaging of IC chips using thermosetting resin. During transfer molding, the upper mold 6 is attached to the upper mold attachment plate 2, and the lower mold attachment plate 47 is attached to the upper die attachment plate 2.
Attach the lower mold 7 to. Before the mold clamping, as shown in FIG. 1, the table 4 is lowered relative to the base 1, and as shown in FIG. 3, the first support 41 and the second support 42 are horizontally They are located side by side and offset from each other. In this mold open state, a resin material is introduced into the shot cavity 9 of the lower mold 7. Next, as shown in FIG. 2, during mold clamping, the ball screw 2 is first driven by the motor 20 of the table drive mechanism 13.
4 and nuts 25, the table 4 is raised relative to the base 1. This table 4 has its first support 4
1 rises until the lower end of the second support 42 is located slightly above the upper end of the second support 42. After that, air cylinder device 3
6 rotates the rotating disk 31 via the rack 38 and pinion 39. This rotating disk 31 rotates until the first support 41 and the second support 42 are aligned in the vertical direction. Incidentally, when the rotary disk 31 rotates in this manner, the push-up pin 35 biased by the spring 34 slightly lifts the rotary disk 31 to reduce sliding resistance. Next, the piston rod 52 of the hydraulic cylinder device 51 rises to raise the lower mold support member 5 with respect to the table 4, and the lower mold 7 is pressed against the upper mold 6. At this time, the final mold clamping force is generated by the hydraulic cylinder device 51, so that sufficient mold clamping pressure is obtained.
1 and the second support 42 contact each other and receive mold clamping pressure. In the mold clamping state, the plunger 64 is raised via the nut 61 and the ball screw 62 by driving the motor 66 of the transfer device 12, and the resin is transferred from the shot cavity 9 to the mold cavity 8 by the plunger 64. . Also, when opening the mold,
Contrary to when the mold is clamped, first the piston rod 52 of the hydraulic cylinder device 51 is lowered, and the lower mold support member 5 is lowered by gravity and the biasing force of the spring 54. Thereafter, the rotary disk 31 is rotated by the drive of the air cylinder device 36, and the first support 41 and the second support 42 are separated. Further, by driving the table drive mechanism 13, the table 4 is lowered with respect to the base 1, and the lower mold 7 is separated from the upper mold 6.

As described above, in the above embodiment, most of the entire stroke of the lower mold support member 5 during mold clamping is performed by the table drive mechanism consisting of the electric servo motor 20, the ball screw 24, the nut 25, etc. 13, the stroke of the hydraulic cylinder device 51 can be small, so a hydraulic cylinder device 51 that uses a small amount of oil can be employed. In other words, even if the hydraulic cylinder device 51 has a small stroke in order to reduce the amount of oil, the total stroke of the lower mold support member 5 can be made sufficiently large. and,
In the case of the illustrated embodiment, the amount of oil can be reduced to about 1/10 compared to the case where the lower mold support member is raised and lowered only by a hydraulic cylinder device. Therefore, molded products such as ICs can be prevented from being contaminated by leaked oil. Nevertheless, since the final mold clamping force is generated by the hydraulic cylinder device 51, sufficient mold clamping pressure can be obtained. Also,
Although the ball screw 24, nut 25, etc. that make up the table drive mechanism 13 are weak in strength,
Since the supports 41 and 42 receive the mold clamping pressure, the table drive mechanism 13 can be protected from the mold clamping pressure, resulting in good durability.
There is no need to make the ball screw 24 thicker.

Note that the present invention is not limited to the above-mentioned embodiments, but can be implemented in various modifications. for example,
In the embodiment described above, the rotating body was provided on the base side, but it is also possible to provide the rotating body on the table side.

[0013]

Effects of the Invention The present invention provides a mold clamping device that opens and clamps the mold by moving the lower mold of the mold consisting of an upper mold and a lower mold in the vertical direction. , a transfer molding machine comprising a transfer device that transfers resin to a cavity formed in the mold in a mold clamping state, the mold clamping device includes a base and an upper mold provided above the base. a mold support member, a table supported movably in the vertical direction between the base and the upper mold support member, a table drive mechanism for moving the table in the vertical direction, and a table driving mechanism for moving the table in the vertical direction; a first support provided to protrude toward the base; a rotating body rotatably supported by the other of the base and the table with the vertical direction as the axis of rotation; a second support that is provided to protrude toward one side and moves between a position in which it is vertically aligned with the first support and a position in which it is out of alignment with the first support as the rotating body rotates; and a second support that is movable in the vertical direction to a position above the table. a lower mold support member that is supported by and supports the lower mold from below; and a cylinder device that is provided between the table and the lower mold support member and moves the lower mold support member in the vertical direction with respect to the table. Since it is equipped with a cylinder device, the stroke of the lower mold support member by this cylinder device can be reduced, and even if the cylinder device is hydraulic, the amount of oil can be reduced, preventing molded products from leaking oil. In addition, by generating the final mold clamping force with a cylinder device, sufficient mold clamping pressure can be obtained, and furthermore, the table drive mechanism is a weak one using a ball screw etc. The durability can also be improved by receiving mold clamping pressure from the support.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a transfer molding machine showing an embodiment of the present invention when the mold is opened.

FIG. 2 is a sectional view of a transfer molding machine showing an embodiment of the present invention during mold clamping.

FIG. 3 is a cross-sectional view taken along line AA in FIG. 1;

[Explanation of symbols]

1 Base 2 Upper mold mounting plate (upper mold support member) 4 Table 5 Lower mold support member 6 Upper mold 7 Lower mold 8 Mold cavity (cavity) 11 Mold clamping device 12 Transfer device 13 Table drive mechanism 31 Rotation Disc (rotating body) 41 1st support 42 2nd support

Claims (1)

[Claims] 1. A mold clamping device that performs mold opening and clamping operations of the mold by vertically moving the lower mold of a mold consisting of an upper mold and a lower mold, and a mold clamping state. In the transfer molding machine, the mold clamping device includes a base, an upper mold support member provided above the base, and a transfer device for transferring resin to a cavity formed in the mold. , a table supported movably in the vertical direction between the base and the upper mold support member;
a table driving mechanism for moving the table in the vertical direction; a first support provided on one of the base and the table to protrude toward the other; and a first support for rotating the table in the vertical direction. a rotating body rotatably supported in the axial direction; and a position provided on the rotating body to protrude toward one of the base and the table and vertically aligned with the first support as the rotating body rotates. and a second support that moves between the detached positions; a lower mold support member that is supported movably in the vertical direction above the table and supports the lower mold from below; and the table and the lower mold support member. 1. A transfer molding machine comprising: a cylinder device disposed between the tables for vertically moving a lower mold support member with respect to the table;