Runner strip structure

Abstract

The invention provides a runner strip structure which comprises a runner strip body, wherein a main runner and a sub-runner are arranged at the top of the runner strip body, and the main runner is connected with the sub-runner. The runner strip is characterized in that an alloy gate insert is arranged on the outer side of the runner strip body, and a runner splicing strip is arranged on the outer side of the alloy gate insert. The gate on the runner strip is made into the independent wear-resistant alloy gate, the gate can be prevented from becoming large due to wear, and gate waste can be easily separated from a plastic-sealed body. The alloy gate has good wear resistance, the runner strip does not need to be replaced frequently during volume production, and only the very small alloy gate insert is required even the runner strip needs to be replaced. The gate insert further has the advantages of simplicity in processing, short processing period and low processing cost.

Description

technical field [0001] The invention relates to a runner strip structure, which is used for the injection molding part of a semiconductor packaging mold. Background technique [0002] During the injection process of semiconductor packaging, the molding compound will have a great impact on the gate of the sprue damage in the molding part. like figure 1 As shown, it is a schematic structural diagram of a traditional runner strip. The runner strip includes a main runner body 3. The top of the main runner body 3 is provided with a main runner 1 and a branch runner 2, and the main runner 1 is connected to the branch runner 2. Because some plastic sealing compounds contain more silicon particles, the hardness of the plastic sealing materials is relatively high, and the plastic sealing materials also have the characteristics of firm welding. When the injection pressure of the press reaches 200 tons, the plastic sealing compound is injected into the cavity through the main channel...

AI Technical Summary

Problems solved by technology

It is difficult to separate the gate waste from the plastic package, and a large gate residue will be formed on the product. If the gate residue is large, the quality of the product will decline, and sometimes the plastic package will be cracked.

This requires the replacement of the sprue bar. If the entire sprue bar needs to be replaced, the processing of the sprue bar is more complicated, vacuum quenching is required, the processing cycle is relatively long, and the processing cost is also high. It is not cost-effective to replace the sprue bar.

Replace the sprue bar of the same steel part, and the gate is also not very wear-resistant

Images