A discharge block seat used in the chip packaging process

Abstract

The invention relates to a discharge block seat used in a chip packaging process, which comprises a discharge block seat main body, on which a limiting part of a rib cutting tool is detachably fixed. The left and right inner walls of the main body of the discharge block seat are symmetrically provided with a plurality of grooves, and the alloy insert is detachably fixed on the main body of the discharge block seat through the grooves. The present invention uses a detachable insert to replace the limit piece integrally formed with the main body of the unloading block seat in the prior art. The limit piece will be in contact with the rib cutting tool, thereby causing the wear of the limit piece. Using the detachable alloy insert of the present invention as the limit piece can only replace the limit piece after the limit piece is worn without replacing the entire The unloading block seat can prolong the service life of the unloading block seat. In addition, the stopper can be manufactured by using an alloy with higher hardness, so that the cost can be saved while prolonging the service life of the unloading block seat.

Description

Technical field: [0001] The invention relates to the field of chip packaging, in particular to a discharge block seat used in the chip packaging process, especially in the rib cutting step. Background technique: [0002] In the existing integrated circuit chip production process, there are generally the following steps: silicon wafer thinning, silicon wafer cutting, chip mounting, chip interconnection, molding technology, deburring, rib trimming, soldering, and coding. Among them, the trimming process refers to the removal of the horizontal ribs and side bars connecting the pins on the lead frame, and the so-called forming process (Forming) is to bend the pins into a certain shape to meet the needs of assembly. Triming generally uses an automatic trimming machine for overall punching, that is, all products that are trimmed and formed by a whole set of knives at one time. The punching specifications used for some common chip package trimming are shown in the following table: ...

AI Technical Summary

Problems solved by technology

Therefore, in the automatic rib cutting machine, the part in contact with the tool during the punching process needs to withstand high-frequency and high-strength punching and friction, refer to the attached image 3 , as a part to support the chip to be cut and the unloading block, the unloading block seat generally has a limit piece that limits the rib cutting tool. It is the surface that is most prone to wear in the whole machine due to multiple contact and friction with the tool. Due to such high-frequency contact and friction, the unloading block seat is often easily damaged and has a low life. In the process of automatic rib cutting, Once the unloading block seat is worn out, it is easy to aggravate the gap between the rib cutting tool and the circuit colloid, resulting in too much resin remaining between the circuit pins, and the two pins are short-circuited with tin, resulting in defective products

[0006] Therefore, how to effectively improve the wear resistance of the wear-resistant surface of the unloading block seat is a problem to be solved by those skilled in the art. Taking into account factors such as processing difficulty, product cost and service life, an integral unloading block seat of ordinary steel is generally used , and this kind of unloading block seat is easy to wear during the high-speed punching process due to its low hardness (generally less than 60 hardness), and has a low service life. After damage, only a new unloading block seat can only be replaced as a whole

In the prior art, the unloading block seat of high hardness material is generally seldom used, because the increase in material hardness will make it more difficult to process and the cost will be higher, and the unloading block seat itself is in a high-frequency stamping environment during use Under the circumstances, high-strength materials are used in time. Although the number of punching resistance and life of the tool has been improved, the cost and processing difficulty have also increased significantly.

[0007] It can be seen that the unloading block seat used on the current automatic rib cutting machine has problems such as low life, easy wear, and high replacement cost

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