Quality inspection of resin bonded diamond grindin

1 Molding material quality inspection

Molding material quality inspection includes inspection of raw materials and mixed materials. The inspection of raw materials is to check whether the binder, concentration, and diamond particle size are consistent with the formula; the inspection of mixed materials is to check whether the mixed materials are uniform and loose. The simple inspection method is to use the naked eye or a magnifying glass to see whether the color of the material is consistent. If white, green, red and other spots or small agglomerates appear, it means that the mixture is uneven and must be re-grinded and sieved; another inspection method is to use solvents The inspection method refers to taking several grams of material from different parts of the binding agent, adding them to the solution at 50 ~ 60C and stirring. After a certain period of time, filter out all the solution in a dry filter, and the remaining residue is at 105C. After drying, the quality of the resin is determined. The difference between the original mass and the remaining mass is the resin quality. If the remaining mass (or resin mass) is the same, it means the mixture is uniform. The solvent inspection method is more accurate, but it takes longer.

2 Finished product quality inspection

The main types of waste resin-bonded diamond grinding tools include: uneven structure, loose structure, uneven thickness, out-of-tolerance layer thickness, diamond layer and non-diamond layer occupying each other, de-ringing, cracks, foaming, and subsequent Dimensional out-of-tolerance, poor concentricity, end-face runout, etc. caused during processing. The causes of these scrap problems can be attributed to raw material and mixing problems, molding operation problems, hardening problems and problems in subsequent processing.

3 Waste recycling method of resin-bonded diamond grinding tools The waste recycling of resin-bonded diamond grinding tools utilizes the heat intolerance of the resin to carbonize and dissolve the resin components, thereby recovering diamonds. The specific method is as follows; the first step is to falsely incinerate the resin binder, smash the waste grinding tools into small pieces, and send them to an electric furnace (muffle furnace) for gradual heating to 500C. During the heating process, ensure that the material and air are sufficient In contact with the resin, when the temperature exceeds the normal hardening temperature of the resin (180 C for phenolic resin and 240 C for polyimide resin), the resin components begin to carbonize, and as the temperature increases, it gradually intensifies, and burns out and ashes at 500 C: Chapter 1 The second step is to treat the metal and metal oxides in the binder. Put the burned ash into a beaker and add hydrochloric acid (1:1). Heat and boil and then pour out the waste. Add an appropriate amount of nitric acid and pour it out after heating. Waste liquid: The third step is to treat the carbon. Add perchloric acid to the remaining material and heat it to remove a small amount of carbon. The fourth step is to wash it with water until it is neutral and dry it.