Diamond paste is a soft abrasive tool made of diamond micro-powder abrasive and paste-like bond, which can also be called loose abrasive tool. It is used to grind hard and brittle materials to obtain a high surface finish. It has good grinding performance, no corrosiveness, good lubrication and cooling, and can improve the efficiency and the smoothness and flatness of the workpiece. It is the ideal high-precision grinding paste.
Diamond paste is also divided into water-soluble abrasive paste and oil-soluble abrasive paste. The oil-soluble grinding paste has good wettability, low grinding force and low grinding heat. It is mainly used for processing high-finish hard alloy and other high-hard alloy parts, instruments and meters, measuring tools, cutting tools, abrasive tools, etc. The water-soluble abrasive paste has low viscosity, easy removal and high processing efficiency. It is mainly used for processing slightly corrosive metals, circuit boards, glass, ceramics, gems, agate and other non-metallic hard and brittle materials. According to the difference of the diamond powder used, it can be divided into polycrystalline diamond abrasive paste and single crystal diamond abrasive paste. Different from single crystal diamond abrasive paste, polycrystalline diamond abrasive paste uses polycrystalline diamond powder as the main abrasive, which has strong self-sharpening properties and can meet the high standards of customers.
Uses of diamond paste
Diamond paste is a commonly used polishing agent, if used properly, a very good polishing effect can be obtained.
Polishing tools, from different types of fibers to sticky pads, are suitable for materials of different hardness. Such as nylon, paper, velvet, cotton, etc.
Pay attention to when polishing:
a. Polishing should be carried out in a dust-free and ventilated place, because hard dust particles are easy to adhere to the diamond paste and will damage the surface that is about to be polished;
b. Each polishing tool should only be used for one type of diamond paste, and pay attention to dust:
c. Wash hands and workpieces every time the diamond paste is changed;
d. Adjust the polishing pressure to match the hardness of the polishing tool and the particle size of the diamond paste. For the finest diamond paste, the pressure is only as large as the weight of the polishing tool.
e. Polishing should start from the corners, edges, pieces or other parts of the mold.
4.0 Solution to problems in polishing:
The main problem with polishing is over-polishing. The so-called over-polishing means that the longer the polishing time, the worse the surface condition. Excessive surface polishing usually refers to the following two phenomena: "orange peel-like peeling" and "pinholes". It should be pointed out that the chances are usually greater when using machine polishing.
4.1 Orange peel-like peeling layer:
After polishing, orange peel-like irregular peeling appears on the surface of the workpiece. The main reason is that the material is soft and the polishing pressure is too large. The hard material can withstand higher polishing pressure and is not easy to be over-polished.
When the polishing surface is deteriorated, increase the polishing pressure to continue polishing. Doing so will inevitably increase the polishing of the surface.
To re-repair the surface of the material after deterioration, the following methods can be used:
Method 1: Use fine sanding to remove the deteriorating layer of the surface before polishing, and then start polishing after the final polishing is completed. A lower polishing pressure should be used during polishing.
Method 2: Release the stress when the temperature is lower than the last tempering temperature of 25°C (45F), and repeat the polishing before polishing until the surface condition is satisfactory. Start polishing again, but the polishing pressure should be lower than the previous polishing pressure.