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Thermal treatment method for large-size complex cross section mold for extruding sectional material of train body

A technology for molds and car bodies, applied in the field of heat treatment, can solve the problems of easy cracking, toughness and deficiencies of molds

Active Publication Date: 2011-12-07
JIANGYIN GIANSUN MOLD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, for the heat treatment of extrusion dies, the processes of annealing, furnace cooling, air cooling, quenching and heat preservation, oil quenching and tempering are usually used. However, in actual production, it is found that the dies treated in this way are easy to crack and have insufficient toughness

Method used

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Embodiment Construction

[0014] The invention relates to a heat treatment method for a large complex cross-section mold used for extruding train car body profiles. The process steps of the heat treatment are as follows:

[0015] 1) Spheroidizing annealing: Carry out spheroidizing annealing treatment on the processed mold, the annealing temperature is 890°C, and the annealing time is 36~60H;

[0016] 2) Cooling with the furnace: the annealed mold is cooled at a temperature drop of 30°C / H, so that the mold temperature drops to 500°C;

[0017] 3) Air cooling: then air cool the mold to room temperature;

[0018] 4) Quenching and heat preservation: Quenching treatment is carried out on the air-cooled mold, and the quenching temperature is 1050°C.

[0019] Quenching time is 2~4H;

[0020] 5) Oil quenching: Then immerse the mold in oil to quench to room temperature;

[0021] 6) Four-stage tempering: Carry out four-stage tempering treatment on the mold, the first-stage tempering temperature is 600°C, and t...

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Abstract

The invention relates to a thermal treatment method for a large-size complex cross section mold for extruding a sectional material of a train body. A thermal treatment process comprises the following steps: 1) spheroidizing; 2) furnace cooling; 3) air cooling; 4) quenching and preserving heat; 5) oil quenching; and 6) four-stage annealing. The large-size complex cross section extruding mold for the train body processed by the thermal treatment method for a large-size complex cross section extruding mold of the train body has the advantages of difficult crack and good ductility.

Description

(1) Technical field [0001] The invention relates to a heat treatment method, in particular to a heat treatment method for a large complex cross-section mold for extruding a train body profile, which is used for heat treatment of the mold for extruding a train body profile. (2) Background technology [0002] At present, for the heat treatment of extrusion dies, the processes of annealing, furnace cooling, air cooling, quenching and heat preservation, oil quenching and tempering are usually used. However, it is found in actual production that the dies treated in this way are easy to crack and have insufficient toughness. (3) Contents of the invention [0003] The object of the present invention is to overcome the above disadvantages and provide a heat treatment method for a large complex cross-section extrusion die for a train car body that is not easy to crack, has good uniformity in structure, stable mechanical properties, and high strength and toughness. [0004] The obje...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/00C21D1/32C21D1/18
Inventor 张振峰田学成张孝张理罡
Owner JIANGYIN GIANSUN MOLD