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The Main Production Processes Of Electroplated Diamond Tools
Nov 25, 2017

Empty electroplating:

(1) The workpiece with electricity entered into the slot, to avoid bipolar phenomenon.

(2) After entering the slot, use a 10mm wide brush dipped in plating bath to repeatedly scrub the surface of the workpiece, and timely remove the dirty. The dwell time should not be too long, when required, re-put the workpiece into the bath after a few minutes before taking out to continue processing.

(3) The current density should not be too large, otherwise the coating crystal is irregular. And it cannot strongly combine with the base, easy to fall off during use. In particular, the plating area of the workpiece is very small, it needs to adjust fine-tune the current. The use of impact current can improve the coating capacity, but to prevent the coating scorch.

Coated the abrasive:

(1) The form of coating abrasive is divided into shakeout and buried abrasive method. The former is suitable for flat parts and rolling parts (parallel grinding wheel and circular grinding wheel). It can be complete coated the whole surface of workpiece only one time. Less abrasive required, and the coating thickness is thin. This method is high efficiency, and suitable for mass production. The latter is suitable for multiple surfaces of workpiece. One time coating can be completed different surfaces, but the thicken layer will hinder the electrolyte in the mass transfer and the conductive process. The efficiency of coating abrasive is low, at the same time require more abrasives. So buried abrasives need to be thin appropriately, don’t plate too thick ensure uniform abrasive layer.

(2) Ensure the current density, the current needs to be stable to avoid coating burnt.

(3) On the flat workpiece, make sure to set ancillary anode, that is suspended above the anode liquid (anode and cathode area ratio = 1: 1), corresponding to the workpiece plane, and anode doesn’t connect the power around the slot. 

(4) For the workpieces of both sides coating, it need to wait for 15 ~ 20min after coating one side. When the abrasive is fixed, then turn another surface to plate it.

(5) Converted the direction of the workpiece on time. Such as pendant or monolithic base, after coating 30min, making the upper or lower transposition to ensure that the workpiece on the abrasive evenly.

(6) After the completion of the workpiece on the abrasive, check the quality. Unqualified products (sand accumulation, nickel tumor, leakage of abrasive and other defects) need to timely re-coat, where leakage of abrasive (or the abrasive is too thin) can be re-coated. The current density and time are closely related with the diamond particle size. The larger the diamond particle size, the smaller the required current density and the shorter the time.

Thickening:

(1) The workpiece with electricity entered into the slot, the initial current is less than the standard value, and gradually raise the current to the standard value (30min or so).

(2) Some workpieces in thickening process also need to be indexed (thickening to about half the time or so).

(3) Set the auxiliary anode for thickening of flat parts.

(4) When it need to transfer the slot for thickening, we must pay attention to fine sand pieces can be placed in the coarse abrasive, but coarse abrasive cannot be placed in the fine abrasive.

(5) Each thickening should be buried near the abrasive, so that the coating thickness closes the abrasive size.