The invention discloses an overlaying manufacture repair technology for a roll
forging die, belonging to the technical field of die overlaying technologies. According to the overlaying manufacture repair technology, the problems of poorer
wear resistance at normal temperature and high temperature, cold-heat
fatigue resistance,
heat stability and high-temperature
oxidation resistance due to direct use of low-heat-resistant steel 5CrMnMo and 5CrNiMo in the prior art are mainly solved. The overlaying manufacture repair technology is mainly characterized by comprising the following treatment steps of selecting the low-heat-resistant steel 5CrMnMo and 5CrNiMo die steel as substrates and enabling the heat treatment
hardness HRC (Rockwell
Hardness) to be 34-42, or integrally
processing the surface of a die cavity to be repaired downwards or outwards for 10-15mm and preheating before
welding the die; overlaying a priming coat with the thickness of 3-6mm by using an overlaying
metal welding material with HRC of 34 to 42; overlaying a
transition layer with the thickness of 3-6mm by using a die overlaying
welding material with HRC of 42 to 48; overlaying a work layer with the thickness of 5-8mm by using an
alloy overlaying material with HRC greater than 55; and carrying out
tempering treatment after welding, furnace cooling to 90-190DEG C and discharging the material out of the furnace. The overlaying manufacture repair technology disclosed by the invention has the characteristics that the manufacturing period of the die is shortened,
processing expenses are saved and the
downtime is shortened and is mainly used for an overlaying manufacture and
repair method of a hot
forging rotary die.