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Heat treatment technology of 45 steel die for metal casting

A technology for metal castings and steel molds, which is applied in the field of heat treatment of 45 steel molds for metal castings. It can solve the problems of uneven mold quality, poor surface quality, and cracking of castings, so as to achieve smooth mold surface, uniform hardness distribution, and improve the quality of finished products. rate effect

Active Publication Date: 2018-04-20
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) Annealing the mold for metal castings, the specific annealing process is: put the mold into a vacuum heating furnace, uniformly increase the temperature within 180 minutes, heat the mold to 600°C, keep it for 200 minutes, and then uniformly cool it down by 260°C within 260 minutes. Reduce the temperature of the mold to 340°C;

[0021] (2) Fill the vacuum heating furnace with argon gas. When the argon gas is filled in the vacuum heating furnace, start heating, and the temperature is evenly increased within 300 minutes. The mold is heated to 820°C and held for 360 minutes. During the heating and holding process , Argon is uniformly introduced, and the amount of argon introduced 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 is finished, transfer the mold to the quenching furnace under the heat preservation state, and use high-pressure mixed gas for quenching and cooling. During quenching, the high-p...

Embodiment 2

[0028] (1) Annealing 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, keep it for 180 minutes, and then uniformly lower the temperature by 260°C within 260 minutes. Reduce the temperature of the mold to 400°C;

[0029] (2) Fill the vacuum heating furnace with argon gas. When the argon gas is filled in the vacuum heating furnace, start heating. The temperature is evenly increased within 300 minutes. The mold is heated to 860°C and held for 300 minutes. During the heating and holding process , Argon is uniformly introduced, and the amount of argon introduced is 3V, and V is the volume of the vacuum heating furnace.

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

Embodiment 3

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

[0037] (2) Fill the vacuum heating furnace with argon gas, and when the argon gas is filled in the vacuum heating furnace, start heating. The temperature is evenly raised within 300 minutes. The mold is heated to 850°C and held for 340 minutes. During the heating and holding process , Argon is uniformly introduced, and the amount of argon introduced 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 is finished, transfer the mold to the quenching furnace under the heat preservation state, and use high-pressure mixed gas for quenching and cooling. During quenching, the high-pressure mix...

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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 automobile parts production, and specifically 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, inhalation or other casting methods, in order to ensure the individual quality and overall consistency of the castings. , You need to strictly check the mold. [0003] Traditional molds are prone to problems such as poor surface quality and uneven quality of the mold itself, easy deformation, and deviation of dimensions during heat treatment. Therefore, casting cracks, uneven hardness distribution of castings, surface wrinkles, etc. often occur when castings are produced. This phenomenon leads to a decrease in the yield of castings, increases the production cost of the enterprise, and reduces the production efficiency...

Claims

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Application Information

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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