Overlaying manufacture repair technology for roll forging die

A technology of manufacturing process and mold surfacing welding consumables, which is applied in the field of hot forging rotary mold surfacing welding manufacturing and repair, and can solve problems such as cold and heat fatigue, cracking, and wear

Active Publication Date: 2013-07-03
HUBEI TRI RING AXLE
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Due to the harsh working conditions of the forging die, the service life is low, and

Method used

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  • Overlaying manufacture repair technology for roll forging die
  • Overlaying manufacture repair technology for roll forging die
  • Overlaying manufacture repair technology for roll forging die

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[0030] The specific method of the roll forging die surfacing manufacturing process of the present invention includes the following process steps:

[0031] ⑴. First, select low heat-resistant steel 5CrMnMo, 5CrNiMo mold steel as the base material, heat treatment hardness of 34-42HRC, according to the long rod forgings roll forging refined billet cavity size to expand 11-20 mm to make the mold, the mold is preheated to Keep the temperature at 550°C for 10 hours. The cost of 5CrMnMo and 5CrNiMo materials is low, and the heat treatment process is not complicated and mature. They have good cutting performance, impact resistance, crack resistance and medium hardenability. However, it has poor wear resistance, thermal fatigue resistance, thermal stability, and high temperature oxidation resistance.

[0032] ⑵Secondly, choose the hardness HRC34~42 surfacing metal welding material, and surfacing the bottom layer with the thickness of 3~6mm in the mold cavity. Hardness HRC34~42 surfacing m...

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Abstract

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.

Description

technical field [0001] The invention belongs to the technical field of mold surfacing welding technology. In particular, it relates to a hot-forging rotary mold surfacing welding manufacturing and repairing method. Background technique [0002] Forging molding is an advanced processing method with high production efficiency, good processing quality and saving raw materials. It is widely used in machinery, motors, automobiles, tractors, aviation, light industry, petrochemical, and power industries. Molds are in high demand. Due to the harsh working conditions and low service life of forging dies, early failures such as cracking, wear, collapse, and cold and heat fatigue often occur. It is of great economic significance to repair forging metal molds by surfacing welding to prolong their service life. At present, the die surfacing technology has been widely used in the forging die of plane parting, and has obtained good results. Roll forging refined billet manufacturing lon...

Claims

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Application Information

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IPC IPC(8): B23P6/00B23K9/04
Inventor 宋斌张金刚邓正友周发明李伟蒋林涛周光铸郭际朱国军
Owner HUBEI TRI RING AXLE
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