Method for processing thick line blank of alloy wire rod made from leadless metal spraying material

Abstract

The invention discloses a processing method of a coarse blank of a lead-free metal sprayed alloy wire, which belongs to the technical field of spraying metal material processing which is used for spraying end faces of a metalized film capacitor. The invention adopts a horizontal continuous casting technique, which includes the following steps: lead-free metal sprayed alloy melt of prepared portions is transferred into a continuous casting furnace, wherein, the temperature of the alloy melt in the furnace is controlled between 450 and 750 DEG C; then the alloy melt flows into a crystallizer to be cooled to form wire casting blanks with a diameter of 8 to 14 millimeters; and then the alloy melt runs out of the crystallizer with the function of a traction device to form coarse blanks, wherein, the traction speed of the traction device is 0.35 to 0.65 meter per minute, and the diameter of the pressure chuck can be over 100 millimeters. The process of the invention is designed reasonably, and is capable of eliminating the defects of bubbles, oil inclusion, core wrapping, etc, in coarse blanks. The invention provides a new way of processing lead-free metal sprayed materials and can effectively improve product quality.

Description

technical field [0001] The invention relates to a method for processing a thick wire billet of a lead-free alloy wire material sprayed with gold, and belongs to the technical field of processing metal materials for gold-sprayed end faces of metallized film capacitors. Background technique [0002] Lead-free gold spray material is mainly used for lead-free gold spray on the end face of metallized film capacitors, with tin-zinc as the base, antimony and copper are added to form a tin-zinc-antimony-copper quaternary alloy, and a small amount of improved elements are added as needed, including : One or more of bismuth, silver, indium, nickel, gallium, phosphorus, chromium, titanium, cobalt, mixed rare earths and germanium. With the development of lead-free electronic information materials in the world, the market of lead-free gold-sprayed materials is expanding rapidly. However, due to the limitation of processing technology, there are still many defects in the product quality o...

AI Technical Summary

Problems solved by technology

The thick wire billet produced by the above extrusion method has many defects that are difficult to overcome, such as air bubbles in the thick wire billet, cracks caused by oil inclusion, and core wrapping caused by poor welding of the end faces of the two ingots during extrusion. Phenomena, etc., all of which will have extremely bad consequences on the final product, such as gun blockage, disconnection, and fire explosion during the gold spraying process, especially likely to cause large fluctuations in the current of the gold spraying equipment and cause automatic shutdown, etc., in the gold spraying layer of the capacitor Coarse particles can be clearly seen on the end face, which restricts its further promotion and use

[0003] The existing horizontal continuous casting technology is generally used for the processing of copper and aluminum materials. This is because copper and aluminum are metal materials with a single melting point, which are materials that are easy to carry out horizontal continuous casting. Composed of various elements, the melting point of solid and liquid phases differ greatly (generally above 100°C), and a variety of complex intermetallic compounds are formed. It is a metal material that is difficult to carry out horizontal continuous casting.

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