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Method for prolonging service life of hot forging die

A technology of die life and hot forging, applied in the manufacture of tools, forging/pressing/hammer devices, forging/pressing/hammering machinery, etc. Hardness, the effect of improving the service life

Inactive Publication Date: 2018-06-05
SHANDONG LUNAN GRP ENERGY EQUIP MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Over the years, in order to solve the above problems, professional workers at home and abroad have continuously improved the service life of hot forging dies, conducted a large number of scientific researches and extensive production practices, such as: constantly developing new materials for hot forging dies, strengthening process equipment, and improving die design. and the level of manufacturing technology have promoted the technological progress of the mold manufacturing industry, but the overall situation is still not very satisfactory

Method used

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  • Method for prolonging service life of hot forging die

Examples

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Effect test

Embodiment 1

[0033] In this embodiment, a small and medium-sized mold with a hot forging material of 5CrNiMo and a height of 260 mm is used as an example, and the mold undergoes forging, annealing, quenching, tempering and laser cladding in sequence.

[0034] A method for improving the service life of a hot forging die, specifically comprising the following steps:

[0035] S1: Forging, the initial forging temperature is 1200°C, the final forging temperature is 800°C, and the air cooling is 30s.

[0036] S2: annealing, heating the mold to 800°C, holding it for 4 hours, cooling to 370°C, out of the furnace, air-cooling to room temperature, sampling 4 points, and performing step S3 when the hardness is 185HB-210HB, otherwise, repeating step S2.

[0037] S3: Quenching, heating the mold, the heating process adopts the gradient heating method, the heating rate is 180 ℃ / h, and when the temperature is 350 ℃, 540 ℃, 720 ℃, hold for 1 hour, heat to 850 ℃, hold for 5 hours, and release, Cool to 750°...

Embodiment 2

[0045] In this embodiment, a small and medium-sized mold with a hot forging material of 5CrNiMo and a height of 370 mm is used as an example, and the mold undergoes forging, annealing, quenching, tempering and laser cladding processes in sequence.

[0046] A method for improving the service life of a hot forging die, specifically comprising the following steps:

[0047] S1: Forging, the initial forging temperature is 1250°C, the final forging temperature is 830°C, and the air cooling is 40s.

[0048]S2: annealing, heating the mold to 810°C, holding for 4.5h, cooling to 320°C, out of the furnace, air-cooling to room temperature, sampling 4 points, and performing step S3 when the hardness is 185HB-210HB, otherwise, repeating step S2.

[0049] S3: Quenching, heating the mold, the heating process adopts the gradient heating method, the heating rate is 150°C / h, and when the temperature is 350°C, 540°C, and 720°C, the temperature is kept for 1-1.5h, heated to 860°C, and the temperat...

Embodiment 3

[0057] In this embodiment, a large mold with a hot forging material of 5CrNiMo and a height of 380 mm is used as an example, and the mold undergoes forging, annealing, quenching, tempering and laser cladding in sequence.

[0058] A method for improving the service life of a hot forging die, specifically comprising the following steps:

[0059] S1: Forging, the initial forging temperature is 1300°C, the final forging temperature is 850°C, and the air cooling is 60s.

[0060] S2: Annealing, heating the mold to 820°C, holding for 5h, cooling to 375°C, out of the furnace, air-cooling to room temperature, sampling 4 points, and performing step S3 when the hardness is 185HB-210HB, otherwise, repeating step S2.

[0061] S3: Quenching, heating the mold, the heating process adopts the gradient heating method, the heating rate is 170°C / h, and when the temperature is 350°C, 540°C, 720°C, the temperature is kept for 1.5h, then heated to 870°C, kept for 6 hours, and released from the furna...

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Abstract

The invention discloses a method for prolonging the service life of a hot forging die. The die is sequentially subjected to the technologies of forging and pressing, annealing, quenching, tempering and laser cladding. According to the method, the die heat treatment technology and the laser cladding technology are combined, and a brand new die hot forging method is formed; by utilization of the heat treatment technology, forging inner stress is eliminated, grains are refined, and die hardness uniformity is promoted; and by utilization of the laser cladding technology, a cladding layer excellentin abrasion resisting performance is formed, influences of conventional abrasion on the service life of the die are weakened, the service life of the die is prolonged, and the enterprise operating cost is reduced.

Description

technical field [0001] The invention relates to the technical field of hot forging die processing, in particular to a method for improving the service life of a hot forging die. Background technique [0002] In the machinery manufacturing industry, various hot forging dies are called the mother of forging production. In the process of use, the internal fracture of the forging die is very serious in the early stage. Some dies have fatigue cracks after dozens of pieces, and some die cavities collapse. From the investigation of the forging site, we learned that the annual scrap loss of special mold steel represented by 5CrNiMo material is more than 20 tons, and the market economic value is about 320,000 yuan. The loss caused by the delay in construction is even more difficult to estimate. Therefore, the short service life of hot forging dies has always been a major problem in the forging industry, and it is also a difficult problem for manufacturing enterprises to develop and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C21D8/00C22C19/07C22C32/00B21J13/02
CPCB21J13/02C21D8/005C22C19/07C22C32/0052C23C24/103
Inventor 宋承军石虎李云海李永伟李刚王俊平刘和庆胡敬涛
Owner SHANDONG LUNAN GRP ENERGY EQUIP MFG
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