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The method of chemically depositing nickel and implanting diamond particles onto a tool does not have this disadvantage. The advantage of this method is that the cutting layer is absolutely uniform along any complex profile, and the hardness of the coating is significantly higher than that of the electrochemical method.
The composition of the electroless nickel plating solution is: nickel sulfate 25 g / L; sodium acetate 15 g / L; ethylene glycol 15 g /; sodium hypophosphite 20 g / L; thiourea 0.0015 g / L. The process specification is: solution temperature 92 ± 2 ° C, PH = 5 ~ 6. In order to better wet the diamond particles and promote their implantation into the cutting layer (by number and distribution uniformity), a special surfactant should be added to the solution.
Two rows of diamond particles are arranged in the cutting layer, and the layer thickness of 100 μm is achieved within 5 to 7 hours. The post-plating tool should be heat treated at a temperature of 350 ° C for 1 h. The tool profile thus obtained fully meets the requirements for direction and profile, and the microhardness of the coating on any section of the surface is 9000 to 10000 MPa.
Chemically plating nickel-diamond cutting layers on tools
The gear for the shaving cutter and the modified honing wheel, on which the nickel-diamond cutting layer is applied, is generally electrochemically performed. The main problem in the manufacture of such tools is to ensure the required geometry of the tooth profile. Due to the uneven thickness of the coating, the size of the modified tooth profile is very complicated and does not always meet the requirements after correction.