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A heat treatment process for 45 steel molds for metal castings

A technology for metal castings and steel molds, which is applied in the field of heat treatment of 45 steel molds for metal castings, can solve the problems of poor surface quality, different mold quality, cracking of castings, etc. rate effect

Active Publication Date: 2019-02-01
HEFEI NANFANG AUTO PARTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the poor surface quality of traditional molds during heat treatment, the quality of the mold itself is not uniform, it is easy to deform, and the scale is deviated. Phenomenon, lead to the reduction of the yield of castings, increase the production cost of the enterprise, reduce the production efficiency of the enterprise, in order to reduce or reduce the deformation of the mold, improve the quality of the mold and the parts cast by the mold, the present invention provides the following technical solutions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Anneal the mold for metal castings. The specific annealing process is: put the mold into a vacuum heating furnace, uniformly heat up within 180 minutes, heat the mold to 600°C and keep it for 200 minutes, and then uniformly cool down to 260°C within 260 minutes. Reduce the temperature of the mold to 340°C;

[0021] (2) Introduce argon gas into the vacuum heating furnace. When the argon gas is filled in the vacuum heating furnace, start heating and uniformly heat up within 300 minutes. Heat the mold to 820°C and keep it warm for 360 minutes. During the process of heating and heat preservation , the argon gas is uniformly fed in, and the argon gas feed rate is 3.5V, and V is the volume of the vacuum heating furnace.

[0022] (3) When the heat preservation of the mold in step 2 ends, transfer the mold to the quenching furnace under heat preservation, and use high-pressure mixed gas for quenching and cooling. During quenching, the wind direction of the high-pressure mix...

Embodiment 2

[0028] (1) Anneal the mold for metal castings. The specific annealing process is as follows: put the mold into a vacuum heating furnace, raise the temperature uniformly within 180 minutes, heat the mold to 660°C and keep it for 180 minutes, and then uniformly cool down to 260°C within 260 minutes. Reduce the temperature of the mold to 400°C;

[0029] (2) Introduce argon gas into the vacuum heating furnace. When the argon gas is filled in the vacuum heating furnace, start heating and uniformly heat up within 300 minutes. Heat the mold to 860°C and keep it warm for 300 minutes. During the process of heating and heat preservation , the argon gas is evenly introduced, and the amount of argon gas introduced is 3V, where V is the volume of the vacuum heating furnace.

[0030] (3) When the heat preservation of the mold in step 2 is completed, transfer the mold to the quenching furnace under the heat preservation state, and use high-pressure mixed gas for quenching and cooling. During...

Embodiment 3

[0036] (1) Anneal the mold for metal castings. The specific annealing process is: put the mold into a vacuum heating furnace, raise the temperature uniformly within 180 minutes, heat the mold to 640°C and keep it for 200 minutes, and then uniformly cool down to 260°C within 260 minutes. Lower the temperature of the mold to 380°C;

[0037] (2) Introduce argon gas into the vacuum heating furnace. When the argon gas is filled in the vacuum heating furnace, start heating and uniformly heat up within 300 minutes. Heat the mold to 850°C and keep it warm for 340 minutes. During the heating and heat preservation process , the argon gas is uniformly fed in, and the argon gas feed rate is 3.5V, and V is the volume of the vacuum heating furnace.

[0038] (3) When the heat preservation of the mold in step 2 ends, transfer the mold to the quenching furnace under heat preservation, and use high-pressure mixed gas for quenching and cooling. During quenching, the wind direction of the high-pr...

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PUM

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Abstract

The invention discloses a heat treatment technology of a 45 steel die for a metal casting. The heat treatment technology comprises the following steps that firstly, annealing treatment is conducted onthe die, normalizing operation is performed on the die in the protective gas atmosphere after annealing is completed, the die is quenched after normalizing is completed, the die is cooled to the environmental temperature after quenching, and finally, the die is further treated through rapid cooling and further heating operation, so that the die has good hardness. By means of the heat treatment technology of the 45 steel die for the metal casting, the produced died is flat in surface and not easy to deform, the yield of the die is increased, and the hardness distribution of the die is uniform;compared with a die produced through a traditional technology, the die is higher in quality.

Description

technical field [0001] The invention belongs to the technical field of auto parts production, and in particular relates to a heat treatment process of a 45 steel mold for metal castings. Background technique [0002] In the production of many auto parts, it is necessary to inject the smelted liquid metal into the pre-prepared casting shape by casting, injection, suction or other casting methods, in order to ensure the individual quality and overall consistency of the castings , it is necessary to strictly control the mold. [0003] Due to the poor surface quality of traditional molds during heat treatment, the quality of the mold itself is not uniform, it is easy to deform, and the scale is deviated. Phenomenon, lead to the reduction of the yield of castings, increase the production cost of the enterprise, reduce the production efficiency of the enterprise, in order to reduce or reduce the deformation of the mold, improve the quality of the mold and the parts cast by the mo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/00C21D1/26C21D1/25C21D1/74
CPCC21D1/25C21D1/26C21D1/74C21D9/0068
Inventor 王光祥王玉成
Owner HEFEI NANFANG AUTO PARTS