(1) main material of resin grinding wheel problems, inappropriate material. Material performance is bad, do not wear; steel unrefined, with a large number of smelting defects; punch, forging forging modified imperfect, remains subject to heat treatment problems.
(2) resin grinding wheel structure design of die structure is unreasonable. Slender punches not designed to reinforce, bad outlet appeared a heap, unloading power punch, Ambassador under alternating load and so on.
(3) grinding production process is not perfect, mainly in the mold poor quality of forging inner heat treatment technology and process issues, causing the mold quench not, soft spots and uneven hardness.