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A heat treatment process for an engine shield

An engine shield and process technology, applied in the field of mechanical processing, can solve problems such as difficulty in obtaining comprehensive performance indicators, insufficient cooling, and insufficient cooling, and achieve the effects of easy promotion and use, long water cooling time, and fast water entry speed

Active Publication Date: 2018-06-08
SHANDONG ZHONGTUO NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (2) Insufficient cooling during performance heat treatment
Quenching in the traditional process is usually cooled to 150°C, that is, the subsequent tempering treatment begins when the martensitic transformation point (220°C) is reached, resulting in insufficient cooling
The tempering temperature is 600-630°C. Tempering below 640°C will easily cause high and uneven hardness, high brittleness, low impact value, and poor toughness.
It is difficult to obtain good comprehensive performance indicators

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Engine shroud quenched and tempered steel for heat treatment process includes the following composition by weight percentage: C 0.52%, Cr 1.07%, Si 0.46%, Mn 0.81%, Ni 0.03%, Ti 0.94%, the balance is Fe and non-removable trace elements, and non-removable trace elements ≤ 0.05%.

[0027] A heat treatment process for an engine shield, carried out according to the following steps:

[0028] (1) Normalizing: carry out the second normalizing treatment on the casted engine shield, the specific operation is: before the first normalizing, the temperature of the shield is 680°C, keep it warm for 3 hours, and then raise the temperature for the first normalizing Fire; normalize for the first time and raise the temperature to 860°C, keep warm for 2 hours; then air cool to 380°C; before the second normalizing, put the shield into the furnace at a temperature of 340°C, keep warm for 4 hours, then raise the temperature to 690°C, keep warm for 3 hours; Then raise the temperature for th...

Embodiment 2

[0033] Engine shroud quenched and tempered steel for heat treatment process includes the following composition by weight percentage: C 0.60%, Cr 1.21%, Si 0.66%, Mn 0.92%, Ni 0.04%, Ti 1.08%, the balance is Fe and non-removable trace elements, and non-removable trace elements ≤ 0.05%.

[0034] A heat treatment process for an engine shield, carried out according to the following steps:

[0035] (1) Normalizing: carry out the second normalizing treatment on the casted engine shield, the specific operation is: before the first normalizing, the temperature of the shield is 690°C, keep it warm for 3.5h, and then heat up for the first time Normalizing; for the first normalizing, heat up to 880°C and keep it warm for 2.5 hours; then air cool to 390°C; before the second normalizing, put the shield into the furnace at a temperature of 350°C, keep it warm for 4.5 hours, and then raise the temperature to 700°C, Keep warm for 3.2 hours; then raise the temperature for the second normalizi...

Embodiment 3

[0040] Engine shroud quenched and tempered steel for heat treatment process includes the following composition by weight percentage: C 0.86%, Cr 1.60%, Si 0.83%, Mn 1.10%, Ni 0.05%, Ti 1.23%, the balance is Fe and non-removable trace elements, and non-removable trace elements ≤ 0.05%.

[0041] A heat treatment process for an engine shield, carried out according to the following steps:

[0042](1) Normalizing: carry out the second normalizing treatment on the casted engine shield, the specific operation is: before the first normalizing, the temperature of the shield is 700°C, keep it warm for 4 hours, and then raise the temperature for the first normalizing Fire; normalize for the first time and heat up to 900°C, keep warm for 3 hours; then air cool to 400°C; before the second normalizing, put the shield into the furnace at a temperature of 360°C, keep warm for 5h, then raise the temperature to 720°C, keep warm for 3.5h ; Then raise the temperature for the second normalizing; ...

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Abstract

The invention discloses a heat treatment technology for an engine shield. The heat treatment technology comprises the steps of 1) carrying out normalizing, specifically, carrying out secondary normalizing treatment on the cast-formed engine shield; 2) carrying out high-temperature tempering, specifically, carrying out heat preservation on the normalized shield in a furnace at 340-380 DEG C for 6-8 hours, carrying out high-temperature tempering to increase the temperature to 670-730 DEG C, carrying out heat preservation for 8-10 hours, gradually cooling the shield until the temperature is lower than 120 DEG C, and discharging the shield from the furnace; 3) carrying out quenching, specifically, raising the temperature of the shield to 680-720 DEG C, carrying out heat preservation for 2-3 hours, increasing the temperature to the quenching temperature of 820-880 DEG C, carrying out heat preservation for 4-5 hours, and then carrying out water cooling to the room temperature; and 4) carrying out annealing, specifically, the shield is finally heated to 380-420 DEG c, carrying out heat preservation for 8-10 hours, increasing the temperature to the annealing temperature of 660-720 DEG C, carrying out heat preservation for 10-12 hours, and carrying out air cooling to the room temperature. According to the heat treatment technology, the heating temperature is properly increased and the heat preservation time is prolonged, and therefore the structure of alloy steel of the engine shield can be fully converted, the mechanical property and the impact toughness of the engine shield can be effectively improved, and the good comprehensive mechanical property requirements of the automobile engine shield can be met.

Description

technical field [0001] The invention belongs to the field of mechanical processing, and in particular relates to a heat treatment process for an engine shield. Background technique [0002] The automobile engine guard is a shell part used to carry the automobile engine, which needs to have the characteristics of high temperature resistance, high pressure, high strength and so on. The heat treatment process after the casting of the automobile engine cover is extremely critical. Among them, heat treatment is a process in which metal workpieces are heated to a certain temperature, kept at this temperature for a certain period of time, cooled in oil or water at different speeds, and controlled by changing the surface or internal structure of the metal material. A process. [0003] At present, the deficiencies of the traditional heat treatment process for shields are as follows: [0004] (1) The post-forging heat treatment process mostly adopts normalizing + tempering. The meta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/00C21D1/28C21D1/18C21D1/26C22C38/04C22C38/02C22C38/50
CPCC21D1/18C21D1/26C21D1/28C21D9/0068C22C38/02C22C38/04C22C38/50
Inventor 何飞
Owner SHANDONG ZHONGTUO NEW ENERGY CO LTD
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