Analysis and solution of coating shedding of electroplated diamond tools

With the development of economy and the progress of science and technology, different industries have basically the same requirements for electroplated diamond tools, namely, high efficiency, long life and high grinding precision. To ensure these characteristics, the coated metal should not only have high hardness and wear resistance, but also be evenly distributed in every part of the matrix, so as not to lose the coating and shorten the life of the tool. In the process of actual use, the coating shedding phenomenon is common. This paper analyzes the causes of this problem and discusses the solutions.
During the use of electroplated diamond tools, due to the use conditions such as grinding force, temperature rise, workpiece impact and other reasons, the metal coating containing diamond will be separated from the steel substrate, which is the coating shedding. In the actual use process, the coating metal layer separation in the metal coating containing diamond: in the use process of the metal coating containing diamond, the metal coating in contact with the workpiece is not normal wear, but abnormal flake or powder fall off, the diamond is not all fall off, but local granular fall off.
Measures to solve the loss of diamond tool coating
In view of the above reasons for coating shedding, the following measures can be taken to solve the problem of coating shedding:
(1) Strengthen pre-plating treatment to completely remove burr, oil, oxide film, rust and oxide skin on the surface of the substrate as far as possible, promote the normal growth of the metal lattice of the coating, and improve the binding force between the metal of the coating and the metal of the substrate.
(2) Optimize the process and procedure, reduce the power failure time during sand unloading, and even continuously discharge sand in the original sand tank, thickening or discharge sand with electric charge in a spare tank, so as to improve the binding force between diamond particles and coating. If there is a power failure in the thickening process, the workpiece should be put into the electrolyte for cathode reduction when re-thickening, and after the reduction, the charged into the tank electroplating to ensure the binding force of the coating.