Electroplating layer stress measurement device

Abstract

The invention relates to an electroplating layer stress measurement device, which consists of an AC excitation power source, an electroplating power source, a measurement sensor, a correction sensor, a cathode piece and a computer. The measurement sensor comprises a first magnetic sensing piece C forming a closed magnetic loop with a primary excitation winding N1 and a secondary sensing winding N2 wound thereon, and insulation paint being coated on the surface of the first magnetic sensing piece C except for a plane electroplating area. The correction sensor comprises a second magnetic sensing piece C' with the same structure, shape and magnetic property with the first magnetic sensing piece C, wherein the surface is sealed and insulated. The primary winding N1 and N1' of the two sensors are connected to the AC excitation power source after series connection, and the secondary winding N2 and N2' are respectively connected to a first amplifier and a second amplifier 2. The cathode piece is used for measuring the type of the stress. The electroplating layer stress measurement device has the advantages of short measurement period, high application measurement precision within the low-stress range and the like; and besides the type of the plating layer stress and the horizontal stress value, the device also can be used for measuring the connection force between the metal plating layer and the base body during the electric crystallization process.

Description

1. Technical field [0001] The invention relates to the measurement of force, especially a device for measuring the internal stress of electroplating layer. 2. Background technology [0002] As we all know, with the emergence of precision electroforming and micro-electroforming technology, many mechanical and mold parts with complex shapes and high precision requirements are made by electroforming. During the electroforming process, the casting coating will generate internal stress. Once the stress is too large, the casting will be deformed and scrapped, causing economic losses to production. The coating stress of castings is closely related to the process conditions of electroplating, and is affected by process parameters such as current density, temperature, metal ions in the bath and the content of various additives, and these parameters will continue to change during the electroforming process. During the casting process, samples are taken from the plating solution in th...

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