JPH0325018B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for separating and transporting a packaged lead frame and cull (resin part) in a multi-pot molding device.

[Conventional technology]

One of the current trends is that transfer molds are becoming larger in size in order to mold a large number of molds at one time in order to increase production efficiency. However, as the size of the mold increases, the loading frame becomes heavier and the workload becomes heavier, so there is an idea to automate the manual work.
This automation method is described in the literature (see "LSI Factory Automation" New Process Technology Collection, first edition published March 31, 1981, publisher: Yoshiyuki Murakawa, producer: KK Edipock), but it tends to result in larger equipment. This may reduce floor space efficiency. It is also a method that is relatively easy to implement without changing the current process, although it is not efficient in terms of investment. In order to achieve complete unmanned operation using this method, the following items need to be automated.
(a) Setting the lead frame into the loading frame, (b) Setting the loading frame into the mold, (c) Preheating the tablet (resin) and charging it into the mold, (d) Operating the molding device, (e) Removing the packaged lead frame and loading frame, (f) cleaning the mold, and (g) separating the cull, runner, gate, etc.

FIG. 3 shows an IC frame formed through the above steps. In the figure, 1 is a lead frame;
2 is a molded IC, 3 is a gate part, and 4 is a cull part. FIG. 4 shows an apparatus for separating the lead frame 1, cull portion 4, and gate portion 3 and transporting them to the next process. In the figure, a frame 1 packaged by a molding device is fed onto a pair of belts 5, 5a and abutted against a fixed block 7 by a push-up block 6. After that, the frame 1 and the cull part 4 are separated by the cull separation blocks 8 and 8a.
In order to separate the gate part 3, the lead frame 1 is pushed down to separate the frame, cull, and gate part, and only the frame 1 part falls onto the belts 5, 5a, and the frame 1 is held down by the presser belts 9, 9a. It is then sent to the next process. Next, the cull portion 4 that was fixed to the fixed block 7 by the uplift block 6 is moved to the inclined block 10 as the upthrust block 6 is lowered.
It is stored in the storage box 11. Note that 12 is a lead frame feeding guide, and 13 is a drive belt.

In the above-mentioned equipment, the cull part and lead frame are separated and the unnecessary cull part is allowed to fall under its own weight, and the entire frame warps due to resin curing during molding, so how can these be transported? is important. Incidentally, the lead frame 1 that has been aligned in the next process is sent to the deburring process because the deburred residue remains at the end of the frame.

[Problem that the invention seeks to solve]

However, in the above device, after separating the lead frame 1 from the cull portion 4 and the gate portion 3, when the cull is dropped and placed against the inclined block 10 and stored in the storage box 11, the burr portion of the cull is removed from the inclined block 10. However, when the next lead frame is separated from the lead frame, it is pushed up by the push-up block and the frame is deformed, resulting in a mistake in the separation of the lead frame or a mistake in carrying out the lead frame.
Furthermore, a roller is required to press down the frame 1 from above in order to prevent the lead frame separated from the cull from warping that occurs during molding.

As described above, the present invention provides a method for separating and transporting lead frames by forcibly discharging the cull to prevent the cull from getting caught and to ensure removal, thereby transporting the lead frame to the next process without any trouble. The purpose is to provide.

[Means for solving problems]

The method for separating and carrying out culls in this invention includes the steps of loading the cull part of an IC frame having an IC part and a cull part onto a cull carrying belt, loading the IC part onto the IC carrying belt, and pushing the cull part with a lower block. The process of lifting the IC frame and sandwiching it between the IC frame and the upper block, the process of pushing down the IC part to separate it from the cull part and lowering it onto the IC carry-out belt, and the process of lifting the IC part with the cull part lifted. It consists of a step of transporting the cull to the next process using a transport belt, and a step of lowering the cull onto the cull transport belt and transporting it.

[Effect]

The function of this invention is that by going through each of the above steps, the cull part is reliably separated from the IC part while being sandwiched between the upper block and the lower block, and after the cull part is unloaded onto the cull carrying belt. , which are forcibly discharged.

〔Example〕

FIG. 1 is a process diagram showing an embodiment of the present invention, and FIG. 2 is a side view. In the figure, 1 is the IC part sent from the molding machine, 4 is the left and right IC
This is the cull part to which part 1 is connected. 14 is an IC transport belt on which the left and right IC sections 1 are mounted and transported;
It is endlessly wound around a pair of left and right pulleys 16 supported on a shaft 15, and a guide plate 17 for the IC section 1 is provided at the outer end of the shaft 15. 18 is the shaft 1 of the pulley 16
A cull carrying belt 20 for carrying out the cull 4 is wound around a pulley 19 coaxially supported at 5, and 20 is a lower block that can be raised and lowered to push up the cull 4.
Above this lower block 20 is the block 20.
There is also an upper block 21 that clamps the cull portion 4. 22 is a cull separation block that separates the cull section 4 from the IC section 1; and 23 is a frame carry-out belt that picks up the IC section 1 from above the IC carry-out belt 14, corrects warping of the IC section, and carries out the frame which can be raised and lowered.

Next, the method for separating and transporting cals will be explained according to each process diagram. First, as shown in FIG.
As shown in b, as the lower block 20 rises, the frame pushes up the cull portion 4 and is clamped together with the upper block 21 to lift the IC frame. In this state, as shown in c, the cal separation block 22
is lowered to separate the IC part 1 from the cull part 4 and remove the IC.
Then, as shown in d, the frame carrying-out belt 23 is lowered to sandwich the IC part 1 together with the IC carrying-out belt 14 and carried out to the next process. At this time, when carrying out the IC section 1,
The warpage of the IC part is corrected. On the other hand, as shown in e, the remaining cull portion 4 that has been sandwiched between the upper and lower blocks 20 and 21 is placed on the cull delivery belt 18 by the lower block 20 descending as shown in f, and then by the rotation of the belt 18. After being carried out, the cull portion 4 is disposed of in a discharge box 24 as shown in FIG.

In this way, in the above-mentioned cull separation and transport method, the IC section 1 and the cull section 4 are separated and only the IC section is carried out first, and then the cull section 4 is forcibly placed on a special belt and discharged. I did it like this, so the IC
There is no possibility that the part and the cull part are mixed together. Also,
Since the IC part 1 is carried out while being held between the frame carry-out belt 23 of the carry-out belt 14, warping of the IC part can be corrected during carrying out.

〔Effect of the invention〕

As explained above, in the method for separating and carrying out culls of the present invention, the cull portions can be placed on a special belt and forcibly disposed of in a predetermined discharge box. Also, when carrying out, the IC part is carried out to the next process while holding down the cull part, and then the cull part is carried out, so the IC
There is no possibility that there are any cull parts mixed in, and a series of operations can be carried out reliably and without any problems. This allows efficient cal separation.

[Brief explanation of drawings]

Fig. 1 a to f are process diagrams showing the method of the present invention, Fig. 2 is a side view, Fig. 3 is a plan view of a conventional lead frame, and Fig. 4 is a diagram showing a conventional cull separation method. . 1...IC section, 4...Cull section, 14...IC carry-out belt, 17...Guidance plate, 18...Cull carry-out belt, 20...Lower block, 21...Upper block, 22...Cull separation block , 23...Frame carry-out belt.

Claims (1)

[Claims] 1 Loading the cull part of an IC frame equipped with an IC part and a cull part onto a cull carrying-out belt, loading the IC part onto the IC carrying-out belt, and pushing the cull part up from the cull carrying belt with a lower block, and a step of lifting the IC frame so as to sandwich it between the IC frame and the upper block, a step of pushing up the IC part while the IC frame is lifted, separating it from the cull part, and lowering it onto the IC carry-out belt. A method for separating and carrying out culls, which comprises the steps of: transporting the IC part with the IC part lifted up to the next process using an IC carry-out belt; and lowering the cull part onto the cull carrying belt, carrying it out, and disposing of it.