JP2000068292A - Transfer method for molded frame and positioning device for transfer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for transferring molded frame and a positioning device for transfer with both of which a molded frame can be transferred by surely positioning or fixing the frame, even with respect to frame with large warpage. SOLUTION: A positioning device for transferring a molded frame 1 formed by molding a resin on a lead frame incorporates a plate 6 for mounting the frame 1 and a positioning means and a fixing means mounted on the plate 6. The positioning means is provided with a guide slope 8a, which guides the relief hole 7 of the molded resin section 1a of the frame 1 and the overall frame 1 to the mounting position of the frame 1 on the plate 6. The fixing means is provided with retaining claws 13, which retain the side sections of the frame 1 by pressing the sections against the plate 6 and the actuating mechanism of the claws 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a positioning device for transferring a mold frame, which is formed by molding a resin into an IC lead frame, one by one in an IC assembling apparatus. It is about.

[0002]

2. Description of the Related Art Conventionally, a lead frame (for convenience of explanation,
After the molding resin is molded into the lead frame and after the molding resin molding is called the mold frame), the package (mold resin)
When processing the upper surface or the mold frame, the mold frames are transported one by one into the apparatus by an external chuck transport mechanism.

The fed mold frame is conveyed while being positioned or fixed in each apparatus. For example, in a rotary mold frame positioning / transporting technique in which the upper surface of a package is laser-marked with the mold frame as it is, as shown in FIG. On the upper surface of the rotary table 3, an escape portion 3 a of the package 2 and a suction nozzle 6 of a suction device (not shown) are provided on a lower portion of the package 2.
Thus, the package lower surface 5 is conveyed while being sucked and positioned.

[0004]

By the way, after the mold resin is molded on the lead frame of the IC, the mold frame is warped in a mountain warp state in the longitudinal direction. In particular, when the frame width and the package are large and the number of mounted frames is large, the amount of shrinkage of the mold resin and the frame greatly affects each other. Therefore, even with such a mold frame, a means for transporting the mold frame one by one with high accuracy is required.

However, in the positioning / transporting technique having the above-described structure, the amount of warpage in the longitudinal direction of the frame generated when molding the resin into the lead frame is 3 to 10 mm.
Large mold frame, especially the thick frame (0.25mm) and large package external dimensions, the package floats from the setting surface of the table even if it is set while pressing the mold frame from the top during setting. There were many.

Accordingly, when the mold frame is transported in such a state, there arises a problem that the mold frame is displaced or the mold frame jumps out of the rotary table.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method and apparatus for transferring a mold frame that can be reliably positioned or fixedly transferred to such a mold frame.

[0008]

In order to solve the above-mentioned problems, according to the present invention, when a mold frame is transferred to a lead frame after being molded with a resin, the transfer is performed with the mold frame mounted on a transfer positioning device. A method of conveying a mold frame, wherein the positioning device comprises:
Including a plate on which a mold frame to be conveyed is mounted, positioning means and fixing means for the mold frame on the plate, and in a state where the frame side portion of the mold frame is pressed onto the plate and fixed by the fixing means, positioning is performed. A method of transporting the mold frame by transporting the apparatus itself was adopted.

In this case, the fixing means has a function of performing a closing operation of pressing the frame side portion on the plate and an opening operation of releasing the pressing, and the opening and closing operation is performed several times when the mold frame is fixed. It is also very suitable to do so.

Further, according to the present invention, there is provided a positioning device for transporting a mold frame used for transporting a mold frame after molding a resin into a lead frame, comprising: a plate on which a mold frame to be transported is mounted; Including positioning means and fixing means provided in the, the positioning means comprises a relief hole of the mold resin portion of the mold frame, and a guide slope to guide the entire mold frame to a position to be mounted on the plate,
The fixing means is configured to include a pressing claw that presses the frame side portion of the mold frame onto the plate, and an operating mechanism of the pressing claw.

In this case, a flat U-shaped piece may be provided on the plate so as to surround both ends in the longitudinal direction of the mold frame from the outside, and the inner surface of the piece may be formed as a guide slope.

[0012] Further, the plate is provided with a rotating shaft extending in the longitudinal direction of the plate, and the base end side of the holding claw is fixed to the rotating shaft so that the distal end can rotate with the rotating shaft, and the tip of the holding claw is provided. A spring that urges the rotating shaft in the direction that presses the frame side onto the plate on the side, a link that protrudes from the rotating shaft, and a movable member that applies force to the tip of this link to rotate the tip of the holding claw in the opening direction May be provided.

In addition, a vertical guide surface having a height before and after the thickness of the mold frame may be provided below the guide slope. In addition, the U-shaped piece and the holding claw may be provided so as to be exchangeable to those having different dimensions corresponding to the type of the mold frame to be mounted.

Further, it is also possible to adopt a configuration in which a plurality of pins are provided on the plate to enter into positioning holes existing on the frame side of the mold frame.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1A and 1B show a configuration of a positioning device for transferring a mold frame according to an embodiment of the present invention, wherein FIG. 1A is a plan view of a main part, FIG. 1B is a side view, and FIG. FIG. 4 is a sectional view taken along line AA of FIG. FIGS. 2A and 2B are explanatory views of the operation, in which FIG. 2A is a side view showing a state when the mold frame is set, and FIG.

The transport positioning apparatus according to the present embodiment includes a plate 6 on which a mold frame 1 to be transported is mounted, and positioning means and fixing means provided on the plate 6, wherein the positioning means comprises a mold frame 1 And a guide inclined surface 8a for guiding the entire mold frame to a position to be mounted on the plate 6. The fixing means presses the frame side portion of the mold frame 1 onto the plate 6. The holding claw 13 is provided with an operating mechanism of the holding claw 13.

Next, these details will be described.
The plate 6 is made of a flat rectangular plate. The first portion which is a relief portion of a portion protruding below the mold resin 1a mounted on the mold frame 1 at the center of the plate 6
When the mold frame 1 is placed in accordance with the first relief hole 7, the guide piece of the mold frame 1 is provided at a position corresponding to both longitudinal ends of the mold frame 1. A U-shaped piece 8 is fixed on the plate 6 with screws 8c.

Two second relief holes (long holes) 9 are provided on both sides between the first relief holes 7 and both ends of the plate 6 in the width direction, respectively. Axis 1
0 is provided. The shaft 10 extends in the longitudinal direction of the second clearance hole 9, that is, in the longitudinal direction of the plate 6. here,
Consideration is given so that the shaft 10 can rotate at the center of the thickness of the plate 6.

Specifically, both ends of the shaft 10 are supported by the plate 6 and are rotatable, and one end protrudes from the end surface of the plate 6. One end of the link 12 is fixed to this protruding portion of the shaft 10, and the other end is a free end extending radially outward of the shaft 10. The center shaft 11a of the bearing 11 is attached to the other end (free end) of the link 12 to form a rolling guide at the other end.

The link 12 is, as shown in FIG.
The other end is fixed to the shaft 10 at an angle so that the rolling guide side faces obliquely upward. In the illustrated example, the angle is about 45 degrees.

At both sides in the width direction of the first relief hole 7, the frame side of the mold frame 1 is
A pair of holding claws 13 for holding are arranged on the top. The base end side of the holding claw 13 is detachably fixed to the shaft 10 by a screw 18. The reason why it is detachable is that the holding claws 13 can be replaced.

A coil spring 14 for applying a pressing force to the tip of the holding claw 13 is set on the shaft 10. The coil spring 14 holds the one end 14 a of the
And the other end 14b is bridged to the plate 6 so that the tip of the holding claw 13 is inward (in the closing direction).
It is biased in the direction to rotate. Thereby, the pressing claw 13 is designed so that the frame side portion of the mold frame 1 can be pressed onto the plate 6 at the tip end side.

The pressing claw 13 is provided on the shaft 1 so as to press almost the entire length of the frame side in the longitudinal direction.
It is formed long in the 0 axis direction. Therefore, two coil springs 14 are arranged for one holding claw 13, that is, four in total.

The holding claw 13 and the link 12 are both fixed to the shaft 10, but both have a certain fixed angle. This angle is approximately 135 degrees as shown in FIG. The reason why such an angle is set is that, as will be described later, a force (opening / closing arm 17) applied to the other end portion of the link 12 equipped with the bearing 11 is used to open and close the holding claw 13. This is to make it happen.

The planar shape of the first relief hole 7 is the plate 6
Mold resin part 1 of mold frame 1 mounted on top
2A is slightly larger than the plane shape of FIG.
As shown in (1), care is taken so that the lower surface portion of the frame side is in contact with the plate 6 around the first relief hole 7.

The U-shaped piece 8 is arranged so that its inner surface part surrounds both ends in the longitudinal direction of the mold frame 1 from the outside, and the inner surface part is a guide slope 8a which is inclined downward. Is formed. The guide slope 8 a guides both end portions in the longitudinal direction of the mold frame 1 and a frame side portion near the both ends to position the mold frame 1 at a target mounting position on the plate 6.

In the transport positioning device having such a configuration, the following operations and functions are exhibited. In FIG. 2, when the mold frame 1 sealed with resin by the transfer arm 16 is transferred to the upper part of the plate 6 by the transfer mechanism (not shown), the opening / closing arm 17 interlocking with the vertical mechanism (not shown) is connected to the link 12. When the bearing 12 is lowered onto the bearing 11 attached to the free end of the shaft 12 and pressed down while receiving the rolling action of the bearing 11, one end of the link 12 is fixed to the shaft 10.
0 is rotated outward.

When the shaft 10 rotates, the holding claw 13 fixed to the shaft 10 rotates outward in the opening direction and is opened.
The mold frame 1 is set while being guided by the guide slope 8a with the holding claws 13 opened.

After the setting is completed, the arm 17 is raised.
When the arm 17 is raised, the holding claw 13 is moved to the coil spring 1.
The mold frame 1 is rotated inward by the urging force of 4, and presses and fixes the frame side portion of the mold frame 1.

As described above, since the frame side portion is fixed by the method of firmly pressing the frame side portion of the mold frame 1 on the plate 6 by the holding claws 13, even if the mold frame 1 is warped, the U-shaped piece 8 The mold frame 1 is set flat inside, so that the mold frame 1 does not shift during transportation. This allows
Even if the transport speed is increased, it is possible to perform stable transport without deviation, pop-out or the like.

In particular, by applying a pressing force to the holding claws 13 of the mold frame 1 by the coil springs 14, the mold frame 1 is absorbed while absorbing the warpage of the mold frame 1.
Is pressed down on the plate 6, the mold frame 1 is always set in a flat state, and when transported to the next step, there is no mistake in the next step. Further, the plate 6 is provided with a holding mechanism mainly composed of a controllable holding claw, so that it can be introduced into an automatic machine.

As described above, by adopting a method in which the mold frame 1 is mounted on the positioning device, and is positioned and fixed, and the entire positioning device is transported, reliable positioning and transport can be performed.

In carrying the positioning device, for example, the plate 6 may be fixed to the carrying means in advance. In such a case, the problem can be easily solved by equipping the transport means with a fixing jig or the like. Although there are various transporting means, for example, the rotary table 3 shown in FIG. 7 can be used.

For the U-shaped piece 8, as shown in FIG. 1, it is very difficult to set up an alignment pin 15 on the plate 6 and to provide a hole for the pin 15 in the piece 8. It is suitable. This is because dimensions A and B in FIG.
As shown in the figure, a plurality of types of pieces 8 processed by changing the dimensions A and B so as to match the size and shape of the mold frame to be conveyed are prepared, and easily exchanged when exchanging with the suitable pieces 8. This is because it can be used.

Also, as shown in FIG. 3 (b), a plurality of types of pressing claws 13 prepared by changing the dimension C are prepared according to the frame width, and are replaced with suitable pressing claws. It is also very suitable to do so. Therefore, in any case, it is desirable to attach it detachably using screws or the like. This is because, by exchanging the pieces 8 and the holding claws 13, it is possible to cope with various types of mold frames having different widths and lengths.

As shown in FIG. 4, when the mold frame 1 is set on the plate 6, the mold frame 1 is located in a guide hole (not shown) which has been previously processed on the frame side of the mold frame 1. However, it is very preferable to adopt a configuration in which several guide pins 20 are erected. In this case, a relief 21 for the guide pin 20 is provided on the holding claw 13.

By providing the guide pins 20 on the plate 6, when setting the mold frame 1 on the plate 6, the guide pins 20 can be passed through the guide holes on the frame side and set with high precision.

FIG. 5 shows a guide slope 8 provided on a U-shaped piece 8.
It is a partial section side view showing other embodiments of a. In this embodiment, a straight portion (vertical guide surface) 8b (having a height D) larger than the thickness of the frame side is provided below the guide slope 8a at the bottom of the piece 8.

When the mold frame 1 is set with a slight displacement as shown in FIG. 6A when the mold frame 1 is set on the plate 6 by the holding claws 13, the guide frame 8 a And slide down, and set in the vertical guide surface 8b as shown in FIG. 6 (b).

Thus, when the mold frame 1 is transported with a slight shift due to the warpage of the mold frame 1 or the play of the frame guide in the previous process, the mold frame 1 is set slightly off the vertical guide surface 8b. However, when pressed down by the pressing claws 13, the frame side slides down from the guide slope 8a and is set in the vertical guide surface 8b, so that the mold frame 1 can be set stably.

The pressing claws 13 of the mold frame 1
A method of correcting the mounting position of the mold frame 1 by performing opening and closing operations several times may be adopted. Then, when the mold frame 1 is set, the warpage of the mold frame 1 is large and the mold frame 1 is not set properly.
The mold frame 1 moves little by little in the piece 8 when the holding claw is opened and closed, such as one that is not set in the piece 8 by one opening and closing operation of the holding claw 13, and is set while sliding. As a result, a setting mistake at the time of setting the mold frame 1 can be eliminated.

[0042]

As described above, according to the present invention, when transporting the mold frame after molding the resin into the lead frame, the plate for mounting the mold frame to be transported, and the mold frame on the plate A method of transporting a mold frame by transporting a positioning device itself in a state where a frame side portion of a mold frame is pressed and fixed on a plate by a fixing device using a positioning device including a positioning device and a fixing device with respect to the mold frame Is adopted, so that it is possible to reliably position or fix and convey even a mold frame having a large warpage.

According to the positioning device for transferring a mold frame according to the present invention, the frame side portion of the mold frame is fixed by firmly pressing the frame side portion of the mold frame with the holding claws. Even if there is, the mold frame is set flat at a predetermined position, and the mold frame does not shift during transportation. As a result, even if the transport speed is increased, it is possible to perform stable transport without deviation, pop-out or the like. In addition, when transported to the next step, mistakes in the next step can be eliminated. In addition, since the plate is provided with a pressing mechanism mainly including a controllable pressing claw, introduction to an automatic machine can be enabled.

[Brief description of the drawings]

FIGS. 1A and 1B show a configuration of a positioning device for transferring a mold frame according to an embodiment of the present invention, wherein FIG. 1A is a plan view of a main part, FIG. 1B is a side view, and FIG. FIG. 4 is a sectional view taken along line AA of FIG.

FIGS. 2A and 2B are explanatory views of the operation of the positioning device according to the embodiment of the present invention, wherein FIG. 2A is a side view showing a state when a mold frame is set, and FIG.

3A and 3B are configuration diagrams according to the embodiment of the present invention, in which FIG. 3A is a plan view illustrating a dimensional relationship of a U-shaped piece, and FIG. 3B is a side view illustrating a dimensional relationship of a pressing claw.

FIG. 4 is a plan view of a positioning device showing another embodiment of the present invention.

FIG. 5 is a partial sectional view showing another embodiment of the guide means of the present invention.

FIG. 6 is a partial sectional view for explaining the operation of the guide means shown in FIG.

7 (a) is a plan view and FIG. 7 (b) is a sectional view of a main part, showing a conventional method of transporting a mold frame.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mold frame (lead frame) 1a Mold resin 6 Plate 7 First relief hole 8 U-shaped piece 8a Guide slope 9 Second relief hole 10 Axis 11 Bearing 11a Central axis 12 Link 13 Holding claw 14 Coil spring 15 Pin 17 Opening / closing Arm 20 guide pin

Claims (8)

[Claims] 1. A method of transporting a mold frame, wherein the mold frame is transported while being mounted on a transport positioning device when transporting the mold frame after molding the resin into a lead frame, wherein the positioning device comprises: Including a plate on which a mold frame to be conveyed is mounted, positioning means and fixing means for the mold frame on the plate, and in a state where the frame side portion of the mold frame is pressed onto the plate and fixed by the fixing means, positioning is performed. A method of transporting a mold frame, comprising transporting the mold frame by transporting the apparatus itself. 2. The fixing means has a function of performing a closing operation of pressing the frame side portion on the plate and an opening operation of releasing the pressing, and performs the opening and closing operation several times when the mold frame is fixed. The method for conveying a mold frame according to claim 1, wherein: 3. A positioning device for transporting a mold frame used for transporting a mold frame after molding resin on a lead frame, comprising: a plate on which a mold frame to be transported is mounted; and a positioning device mounted on the plate. Means and fixing means, wherein the positioning means comprises a relief hole for the mold resin portion of the mold frame, and a guide slope for guiding the entire mold frame to a position to be mounted on the plate, and the fixing means,
A positioning device for transporting a mold frame, comprising: a pressing claw for pressing a frame side portion of a mold frame onto a plate to sandwich the same; and an operating mechanism of the pressing claw. 4. A flat U-shaped piece disposed on the plate so as to surround both ends in the longitudinal direction of the mold frame from outside, and an inner surface of the piece is formed on the guide slope. The positioning device for transferring a mold frame according to claim 3. 5. The plate is provided with a rotating shaft extending in a longitudinal direction of the plate, and a base end side of the holding claw is fixed to the rotating shaft so that a distal end side can rotate with the rotating shaft, and a holding claw is provided. A spring that urges the rotating shaft in the direction that presses the frame side onto the plate at the tip side of the link, a link that protrudes from the rotating shaft, and applies a force to the tip of this link to rotate the tip of the holding claw in the opening direction The positioning device for transferring a mold frame according to claim 3, further comprising a movable member that causes the movable member to move. 6. The positioning device for transporting a mold frame according to claim 3, wherein a vertical guide surface having a height of about the thickness of the mold frame is provided below the guide slope. 7. The U-shaped piece and the holding claw are provided so as to be exchangeable to those having different dimensions corresponding to the type of a mold frame to be mounted.
7. The apparatus for positioning a mold frame according to any one of claims 6 to 6. 8. A plate according to claim 3, wherein a plurality of pins are provided on said plate to enter into positioning holes present on the frame side of the mold frame.
The positioning device for conveying a mold frame according to any one of the above.