Chap preventing process for aluminum foil pre-pricking pore of aluminum electrolysis capacitor

Abstract

The invention relates to a crack prevention process for an pre-puncture formed on an aluminum foil of an aluminum electrolytic capacitor. The crack prevention process comprises the following steps: a riveting mechanism directly forms the pre-puncture on the aluminum foil in advance; a manipulator for nipping a needle sends a guide needle in position, and the guide needle covers the pre-puncture, thereby overlapping the midline of the guide needle and the midline of the pre-puncture; the combination of the aluminum foil and the guide needle, which is equipped with a guide needle, is subjected to second puncturing and riveting, the punctured and riveted part is the part where the pre-puncture is formed; and a flattening mould is utilized to forge a turnover-flower formed after the second puncturing and riveting into the final turnover-flower shape. The crack prevention process forms the pre-puncture on the aluminum foil in advance, performs second puncturing and riveting after the guideneedle is in position, and further forms the final turnover-flower shape with the flattening mould, thereby solving the problem of impaction crack of the aluminum foil caused by the first puncturing and riveting, completely eliminating the impact on the aluminum foil caused by the second puncturing and riveting, avoiding crack, efficiently solving the problem existed in the prior art, that is, the aluminum foil is easily cracked when being punctured and riveted, and improving the product qualification rate and the product quality.

Description

technical field [0001] The invention relates to a capacitor, in particular to a riveting production process for aluminum foil and guide pins of an aluminum electrolytic capacitor. The invention belongs to the technical field of manufacturing aluminum electrolytic capacitors. Background technique [0002] The lead-out electrodes of aluminum electrolytic capacitors are riveted to the positive and negative aluminum foils by riveting the guide pins (or "leads"). The quality of riveting directly determines the final quality of aluminum electrolytic capacitors. [0003] The production process is as follows: the aluminum foil and the riveting part of the guide pin are overlapped at an angle of 90°, and placed on the riveting mold, and the four riveting pins with the same conical surface are pressed by the hammer and pierced instantly. The overlapping guide pins and aluminum foils form the riveting hole for one embossing, and then put the embossed part on the flattening mold statio...

AI Technical Summary

Problems solved by technology

During this process, due to the difference in aluminum foil material (especially high-pressure aluminum foil), the existence of factors such as poor conical angle of the riveting needle, edge wear and other factors, often lead to aluminum foil cracking at the riveting part, and aluminum foil cracking will make the riveting parts contact The multiplied resistance will increase the impedance, leakage current, and loss tangent of the capacitor, and the capacity will be unstable, resulting in a decline in quality or even scrapping; severe lacerations will also cause internal foil breakage in the core package in the subsequent process, resulting in fatal hidden dangers of quality

Images