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Vacuum heat treatment method of large automobile structural member die-casting die

A technology for vacuum heat treatment and automobile structure, applied in heat treatment furnaces, heat treatment equipment, furnace types, etc., it can solve the problems of mold performance decline and mold life not meeting the requirements, and achieve the effect of damage performance and reduction of cracking risk.

Inactive Publication Date: 2019-09-17
NINGBO HELI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above process has effectively improved the amount of deformation, it has led to a decline in the performance of the mold, making the life of the mold less than the requirement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: the vacuum heat treatment method of instrument panel die-casting mold

[0027] The large instrument panel die-casting mold has an overall size of 940×920×310, a vacuum heat treatment weight of 1256 kg, and a finishing allowance of 2 mm on one side of the mold. After heat treatment, the hardness is required to be HRC44-46.

[0028] The mold is made in an imported vacuum heat treatment furnace. The effective size of the furnace is: 1000mm×1000mm×1500mm, and the rated heat treatment weight is 1500 kg. When loading the furnace, drill a Φ2.2×16 hole on the back of the mold for inserting a thermocouple. The temperature at this point is the surface temperature of the mold, which is recorded as Ts. Insert the thermocouple into the center of the water pipe of the mould, and block both ends with asbestos to ensure that the end of the thermocouple is in contact with the inner wall of the water pipe of the mould. The temperature at this point is the core temperature o...

Embodiment 2

[0047] Embodiment 2: The vacuum heat treatment method of shock tower die-casting mold

[0048] Dimensions of shock tower die-casting mold are 840×820×410, vacuum heat treatment weight is 1456 kg, unilateral finishing allowance is 2mm, and hardness HRC42~46 is required after heat treatment.

[0049] The mold is made in an imported vacuum heat treatment furnace. The effective size of the furnace is: 1000mm×1000mm×1500mm, and the rated heat treatment weight is 1500 kg. When loading the furnace, drill a Φ2.2×16 hole on the back of the mold for inserting a thermocouple. The temperature at this point is the surface temperature of the mold, which is recorded as Ts. Insert the thermocouple into the center of the water pipe of the mould, and block both ends with asbestos to ensure that the end of the thermocouple is in contact with the inner wall of the water pipe of the mould. The temperature at this point is the core temperature of the mould, denoted as Tc. The heat treatment furnac...

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Abstract

The invention discloses a vacuum heat treatment method of a large automobile structural member die-casting die. The vacuum heat treatment method comprises a heating step 1 and a cooling step 2, wherein the heating step 1 is used for heating a die to austenitizing; the cooling step 2 is used for carrying the heating step 1, and the cooling step 2 comprises the following steps that the temperature of the die surface is quenched to 427 DEG C under the cooling pressure of not lower than 10 Bar; the cooling pressure is reduced to 2 Bar, a cooling fan is stopped and a convection fan is started at the same time, and the isothermal process is carried out; when the temperature difference between the core part temperature and the surface temperature is 90 DEG C, or when the isothermal time reaches 10 minutes, the isothermal process is ended; and when the cooling pressure is increased to more than 10 Bar, the convection fan is stopped and the cooling fan is started at the same time, and when the temperature of the die core is quenched to 93 DEG C, the die is discharged from the furnace. The vacuum heat treatment method has the advantages that the cracking risk can be reduced, and the performance of the die-casting die is not damaged.

Description

technical field [0001] The invention relates to a heat treatment process, in particular to a vacuum heat treatment process for a large, complex and long-life die-casting mold. Background technique [0002] Die-casting molds for automobile door inner panels, instrument panels, trunk tail boxes, sub-frames and other body structures are often large in size (over 900 mm in size and over 1,000 kg in weight) and have complex cavities (many core-pulling mechanisms, Uneven thickness), thick wall thickness (more than 300mm). The traditional rapid cooling can easily lead to mold deformation and even cracking. Many heat treatment manufacturers at home and abroad mostly adopt furnace temperature control heating, adopt the heat treatment process of step quenching with cooling pressure less than 10Bar; such as the domestic patent of patent No. When the surface temperature of the mold is cooled to a temperature of 400 ± 50°C during the nitrogen-filled rapid cooling process, control and k...

Claims

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Application Information

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IPC IPC(8): C21D1/20C21D9/00C21D1/30
CPCC21D1/20C21D1/30C21D9/0068
Inventor 王春涛姚杰林真郑东旭陈王海张芳芳
Owner NINGBO HELI TECH CO LTD
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