JP3616721B2 - Mold frame transfer method and transfer positioning device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mold frame transport method and a transport positioning apparatus for positioning and transporting mold frames after molding resin molding onto an IC lead frame one by one in an IC assembly apparatus, for example.
[0002]
[Prior art]
Conventionally, after molding resin molding into a lead frame (for convenience of explanation, a lead frame before molding resin molding is referred to as a lead frame, and after molding resin molding is referred to as a molding frame), it is processed into the upper surface of the package (molding resin) or the molding frame. In the case of carrying out, the mold frames are conveyed one by one into the apparatus by an external chuck conveying mechanism.
[0003]
The sent mold frame is conveyed in a state of being positioned or fixed in each apparatus.
For example, in the rotary mold frame positioning and conveying technology in which the mold frame is laser-printed on the upper surface of the package, as shown in FIG. 7, a piece 4 provided with a taper 4 a for guiding the mold frame 1 is attached to the turntable 3. The package lower surface 5 is adsorbed and positioned on the upper surface of the rotary table 3 by a suction nozzle 6 of a suction device (not shown) from the lower portion of the escape portion 3a of the package 2 and the lower surface position of the package 2. Conveying.
[0004]
[Problems to be solved by the invention]
By the way, the mold frame after molding resin molding on the lead frame of the IC is warped in a state of being warped in the longitudinal direction. In particular, when the frame width and the package are large and the number of mountings is large, the shrinkage amount of the mold resin and the frame greatly affects each other, and the frame after molding the resin is greatly warped and wavy. Therefore, it is necessary to provide means for accurately transporting the mold frame one by one in the apparatus.
[0005]
However, in the positioning and conveying technique having the above-described configuration, a mold frame having a large amount of arch warp in the longitudinal direction of 3 to 10 mm generated when the lead frame is molded with resin molding, particularly a package having a large frame thickness (0.25 mm). When a mold frame having a large outer dimension is set while pressing the mold frame from above at the time of setting, the package often floats from the set surface of the table.
[0006]
Therefore, when the mold frame is conveyed in such a state, there arises a problem that the mold frame is displaced or the mold frame jumps out of the rotary table.
[0007]
Therefore, an object of the present invention is to provide a mold frame transport method and a transport positioning device that can be reliably positioned or fixed and transported with respect to such a mold frame.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides a mold frame transport method for transporting a mold frame mounted on a transport positioning device when transporting a mold frame after molding resin molding on a lead frame. The positioning device includes a plate on which the mold frame to be transported is mounted and positioning means and fixing means for the mold frame on the plate, and the fixing means presses and fixes the frame side portion of the mold frame on the plate. In this state, a method of transporting the mold frame by transporting the positioning device itself was adopted.
[0009]
At that time, the fixing means has a function of performing a closing operation for pressing the frame side portion on the plate and an opening operation for releasing the pressing, and the opening / closing operation is performed several times when the mold frame is fixed. Very suitable.
[0010]
Also, in the present invention, a mold frame transport positioning device used when transporting a mold frame after molding resin molding on a lead frame, the plate mounting the mold frame to be transported, and the plate equipped Positioning means and fixing means, the positioning means comprising a relief hole in 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 includes the mold frame A pressing claw that presses and sandwiches the frame side portion on the plate and an operation mechanism of the pressing claw.
[0011]
In this case, there may be a planar U-shaped piece arranged on the plate so as to surround both ends in the longitudinal direction of the mold frame from the outside, and the inner side surface of the piece may be formed on the guide slope.
[0012]
In addition, the plate is provided with a rotating shaft extending in the longitudinal direction of the plate, the proximal end side of the pressing claw is fixed to the rotating shaft, the distal end side can be rotated together with the rotating shaft, and the frame is formed on the distal end side of the pressing claw A spring that urges the rotating shaft in the direction of pressing the side onto the plate, 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 presser claw in the opening direction It is also possible to adopt a configuration.
[0013]
Moreover, the vertical guide surface used as the height before and behind the thickness of a mold frame can also be provided in the lower part of a guide slope.
Moreover, it can also be set as the structure provided so that the U-shaped piece and the press nail | claw can be replaced | exchanged for the thing of a different dimension corresponding to the kind of mold frame which should be mounted.
[0014]
Furthermore, it is also possible to adopt a configuration in which a plurality of pins that project into positioning holes existing on the frame side of the mold frame are provided on the plate.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
1A and 1B show the configuration of a mold frame transfer positioning device according to an embodiment of the present invention. FIG. 1A is a plan view of a main part, FIG. 1B is a side view, and FIG. It is an AA sectional view taken on the line. 2A and 2B are operation explanatory views, in which FIG. 2A is a side view showing when the mold frame is set, and FIG. 2B is a side view showing after setting.
[0016]
The transport positioning apparatus according to the present embodiment includes a plate 6 on which the mold frame 1 to be transported is mounted, positioning means and fixing means equipped on the plate 6, and the positioning means is a mold resin of the mold frame 1. 1a portion relief hole 7 and a guide slope 8a for guiding the entire mold frame to a position to be mounted on the plate 6, the fixing means pressing the frame side portion of the mold frame 1 against the plate 6 The claw 13 and the operation mechanism of the pressing claw 13 are provided.
[0017]
Next, these details will be described. The plate 6 is made of a flat rectangular plate. A first escape hole (long hole) 7 is provided in the central portion of the plate 6 as a relief portion of the portion projecting downward from the mold resin 1 a mounted on the mold frame 1. In addition, when the mold frame 1 is placed, a U-shaped piece 8 which is a guide piece of the mold frame 1 is fixed on the plate 6 with screws 8c at positions matched to both ends of the mold frame 1 in the longitudinal direction.
[0018]
Two second escape holes (long holes) 9 are provided on both sides between the first escape hole 7 and both ends in the width direction of the plate 6, and a shaft 10 is provided in each of the second escape holes 9. Is provided. The shaft 10 extends in the longitudinal direction of the second relief 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.
[0019]
Specifically, both ends of the shaft 10 are supported by the plate 6 and can rotate, and one end portion 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. A center shaft 11a of the bearing 11 is attached to the other end portion (free end) of the link 12 to constitute a rolling guide at the other end portion.
[0020]
As shown in FIG. 1B, the link 12 is fixed to the shaft 10 with a certain angle so that the rolling guide side of the other end portion faces obliquely upward. In the illustrated example, it is around 45 degrees.
[0021]
A pair of pressing claws 13 that press the frame side of the mold frame 1 onto the plate 6 are disposed on both sides in the width direction of the first clearance hole 7. The proximal end side of the presser claw 13 is detachably fixed to the shaft 10 by screws 18. The reason why it is detachable is to allow the presser claw 13 to be exchanged.
[0022]
A coil spring 14 for applying a pressing force to the tip of the pressing claw 13 is set on the shaft 10. The coil spring 14 is attached in a direction in which one end portion 14a is passed over the presser pawl 13 and the other end portion 14b is passed over the plate 6 so that the tip end portion of the presser pawl 13 is rotated inwardly (in the closing direction). It is fast. Thus, 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 side.
[0023]
The presser claw 13 is formed long in the axial direction of the shaft 10 so as to press almost the entire longitudinal direction of the frame side. Therefore, two coil springs 14 are arranged with respect to one holding claw 13, for a total of four.
[0024]
The presser pawl 13 and the link 12 are both fixed to the shaft 10, but both have a fixed angle. This angle is approximately around 135 degrees as shown in FIG. This angle is set, as will be described later, by using a force (open / close arm 17) applied to the other end portion of the link 12 equipped with the bearing 11 to open / close the holding claw 13. This is to make it happen.
[0025]
The planar shape of the first relief hole 7 is slightly larger than the planar shape of the mold resin portion 1a of the mold frame 1 mounted on the plate 6, and as shown in FIG. Is in contact with the plate 6 around the first clearance hole 7.
[0026]
Further, the U-shaped piece 8 is arranged so that the inner side surface portion surrounds both ends in the longitudinal direction of the mold frame 1 from the outside, and the inner side surface portion is formed on a guide slope 8a inclined downward. ing. The guide slopes 8 a are for guiding the both end portions of the mold frame 1 in the longitudinal direction and the frame side portions in the vicinity thereof and positioning them at the target mounting positions on the plate 6.
[0027]
The transport positioning device having such a configuration exhibits the following operations and functions.
In FIG. 2, when the mold frame 1 resin-sealed by the transport arm 16 is transported to the upper part of the plate 6 by a transport mechanism (not shown), the opening / closing arm 17 interlocked with the vertical mechanism (not shown) is linked 12. When the bearing 11 is lowered on the bearing 11 attached to the free end and pushed downward while receiving the rolling action of the bearing 11, the one end side of the link 12 is fixed to the shaft 10, so that the shaft 10 rotates outward. Be made.
[0028]
When the shaft 10 rotates, the presser claw 13 fixed to the shaft 10 rotates and opens outward in the opening direction. The mold frame 1 is set while being guided by the guide slope 8a in a state in which the presser claw 13 is opened.
[0029]
After completing the setting, the arm 17 is raised. When the arm 17 is raised, the pressing claw 13 is rotated inward by the urging force of the coil spring 14 to press and fix the frame side portion of the mold frame 1.
[0030]
In this way, the frame side portion of the mold frame 1 is fixed to the plate 6 by the method of firmly pressing the mold frame 1 with the pressing claws 13, so that even if the mold frame 1 is warped, it is flat in the U-shaped piece 8. Therefore, the mold frame 1 is not displaced during transportation. This makes it possible to carry out stable conveyance without shifting or popping out even if the conveyance speed increases.
[0031]
In particular, since the mold frame 1 is pressed onto the plate 6 while absorbing the warp of the mold frame 1 by applying a pressing force to the pressing claws 13 of the mold frame 1 with the coil spring 14, the mold frame 1 is always in a flat state. When set and transported to the next process, mistakes in the next process can be eliminated . In addition, since the plate 6 is equipped with a pressing mechanism mainly composed of controllable pressing claws, it can be introduced into an automatic machine.
[0032]
By adopting the method of carrying the entire positioning device in a state where the mold frame 1 is mounted and fixed on the positioning device in this way, reliable positioning and conveyance can be performed.
[0033]
When the positioning device is transported, for example, the plate 6 portion may be fixed to the transporting means in advance. In that case, the problem can be solved easily by providing a fixing jig or the like on the conveying means side. Although there are various conveying means, for example, the rotary table 3 shown in FIG.
[0034]
For the U-shaped piece 8, as shown in FIG. 1, it is also very suitable that a positioning pin 15 is erected on the plate 6 and a hole through which the pin 15 passes is provided in the piece 8. . This is because, as shown by dimensions A and B in FIG. 3A, a plurality of types of pieces 8 processed by changing dimensions A and B so as to match the size and shape of the mold frame to be conveyed are prepared and adapted. This is because it can be easily exchanged for use when the piece 8 is exchanged.
[0035]
Also, as shown in FIG. 3 (b), a plurality of types of presser claws 13 that are processed by changing the dimension C are prepared in accordance with the frame width, and they are exchanged with suitable presser claws for use. Very suitable. Therefore, in any case, it is desirable to attach it detachably with screws or the like. This is because by exchanging the piece 8 and the holding claw 13, it is possible to deal with a variety of products having different mold frame widths and lengths.
[0036]
In addition, as shown in FIG. 4, in a state where the mold frame 1 is set on the plate 6, it is located in a guide hole (not shown) that is processed in advance on the frame side of the mold frame 1. It is very preferable to have a configuration in which several guide pins 20 are erected. In that case, a relief portion 21 for the guide pin 20 is provided in the presser claw 13.
[0037]
By providing the guide pins 20 on the plate 6, when the mold frame 1 is set on the plate 6, the guide pins 20 can be passed through the guide holes on the frame side and set with high accuracy.
[0038]
FIG. 5 is a partial cross-sectional side view showing another embodiment of the guide slope 8 a provided on the U-shaped piece 8. In this embodiment, at the bottom of the piece 8, a straight portion (vertical guide surface) 8 b larger (height D) than the frame side plate thickness is provided below the guide slope 8 a.
[0039]
When the mold frame 1 is set, when the mold frame 1 is set slightly shifted as shown in FIG. 6A, the mold frame 1 is guided to the guide slope 8a portion when it is pressed onto the plate 6 by the pressing claws 13. It slips down and is set in the vertical guide surface 8b as shown in FIG.
[0040]
Thereby, when the mold frame 1 is transported with a slight shift due to warpage of the mold frame 1 or the amount of play of the frame guide in the previous process, it is set slightly apart from the vertical guide surface 8b. Since the frame side slides down from the guide slope 8a and is set in the vertical guide surface 8b when pressed by the pressing claw 13, the mold frame 1 can be stably set.
[0041]
In addition, you may employ | adopt the method of correcting the mounting position of the mold frame 1 by opening / closing the press nail | claw 13 of the mold frame 1 several times. Then, when the mold frame 1 is set, the presser claw opening / closing operation such as the one that the warp of the mold frame 1 is not set correctly and that the presser claw 13 is not set in the piece 8 by one opening / closing operation of the presser claw 13 etc. Sometimes the mold frame 1 moves little by little in the piece 8 and is set while sliding. Thereby, the setting mistake at the time of setting of the mold frame 1 can be eliminated.
[0042]
【The invention's effect】
As described above, according to the present invention, when a mold frame after molding resin molding on a lead frame is transported, a plate on which the mold frame to be transported is mounted, positioning means for the mold frame on the plate, and fixing Since the positioning device including the means is used and the mold frame is conveyed by conveying the positioning device itself in a state where the frame side portion of the mold frame is pressed onto the plate and fixed by the fixing means, Even a mold frame with a large warp can be reliably positioned or fixed and conveyed.
[0043]
Further, according to the mold frame transport positioning device according to the present invention, the frame side portion of the mold frame is fixed to the plate by firmly pressing the frame side portion of the mold frame with the pressing claws. Is set flat at a predetermined position, and the mold frame is not displaced during conveyance. This makes it possible to carry out stable conveyance without shifting or popping out even if the conveyance speed increases. In addition, mistakes in the next process can be eliminated when transported to the next process. Furthermore, since the plate is equipped with a pressing mechanism mainly composed of controllable pressing claws, it can be introduced into an automatic machine.
[Brief description of the drawings]
FIGS. 1A and 1B show a structure of a positioning apparatus for conveying a mold frame according to an embodiment of the present invention, wherein FIG. 1A is a plan view of an essential part, FIG. 1B is a side view, and FIG. It is an AA sectional view taken on the line.
2A and 2B are operation explanatory views of the positioning device according to the embodiment of the present invention, in which FIG. 2A is a side view showing when the mold frame is set, and FIG. 2B is a side view showing after setting;
3A and 3B are configuration diagrams according to the embodiment of the present invention, in which FIG. 3A is a plan view showing a dimensional relationship of a U-shaped piece, and FIG. 3B is a side view showing a dimensional relationship of a presser 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.
6 is a partial cross-sectional view for explaining the operation of the guide means shown in FIG.
7A and 7B show a conventional mold frame conveying method, in which FIG. 7A is a plan view and FIG. 7B is a cross-sectional view of a main part.
[Explanation of symbols]
1 Mold frame (lead frame)
DESCRIPTION OF SYMBOLS 1a Mold resin 6 Plate 7 1st relief hole 8 U-shaped piece 8a Guide slope 9 2nd relief hole 10 Axis 11 Bearing 11a Center axis 12 Link 13 Holding claw 14 Coil spring 15 Pin 17 Opening / closing arm 20 Guide pin

Claims (8)

A mold frame transport method for transporting a mold frame mounted on a transport positioning device when transporting a mold frame after molding resin molding on a lead frame, wherein the positioning device is a mold frame to be transported And a positioning means and a fixing means for the mold frame on the plate,
The fixing means has a function of performing a closing operation for pressing the frame side portion on the plate and an opening operation for releasing the pressing, and the positioning means is a guide slope for guiding the entire mold frame to a position to be mounted on the plate. Have
After performing the opening and closing operation of the fixing means several times when the mold frame is fixed, the mounting position of the mold frame is corrected and positioned by the guide slope,
A method of transporting a mold frame, wherein the mold frame is transported by transporting the positioning device itself in a state in which the frame side portion of the mold frame is pressed onto the plate and fixed by a fixing means. The mold according to claim 1, wherein the fixing means has a presser claw that is formed so as to be able to press almost the entire longitudinal direction of the frame side of the mold frame onto the plate. Frame transport method. A positioning device for transporting a mold frame used when transporting a mold frame after molding resin molding on a lead frame, a plate on which a mold frame to be transported is mounted, positioning means and fixing means equipped on the plate, The positioning means includes a relief hole in the mold resin portion of the mold frame and a guide slope that guides the entire mold frame to a position to be mounted on the plate, and the fixing means includes a frame side portion of the mold frame. A mold frame conveyance positioning device comprising: a pressing claw that presses and clamps the plate on the plate; and an operating mechanism for the pressing claw. The planar U-shaped piece arranged on the plate so as to surround both ends in the longitudinal direction of the mold frame from the outside, and the inner side surface of the piece is formed on the guide slope. Positioning device for conveying mold frames. The plate is provided with a rotating shaft extending in the longitudinal direction of the plate, the proximal end side of the pressing claw is fixed to the rotating shaft, the distal end side can be rotated together with the rotating shaft, and the distal end side of the pressing claw A spring that urges the rotating shaft in the direction of pressing the frame side onto the plate, a link protruding from the rotating shaft, and a movable member that applies a force to the tip of the link to rotate the tip of the presser claw in the opening direction. The positioning apparatus for transporting a mold frame according to claim 3, wherein the positioning apparatus is provided. 5. The positioning apparatus for conveying a mold frame according to 3 or 4, wherein a vertical guide surface having a height before and after the thickness of the mold frame is provided below the guide slope. The mold frame according to any one of claims 3 to 6, wherein the U-shaped piece and the holding claw are provided so as to be exchangeable with ones having different dimensions corresponding to the type of the mold frame to be mounted. Positioning device for transport. A plurality of pins protruding into positioning holes existing on the frame side of the mold frame are provided on the plate so as to convey the mold frame according to any one of claims 3 to 7. Positioning device.

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