Heat treatment technology for engine shield

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

Active Publication Date: 2017-09-22
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] The engine guard quenched and tempered steel used for the heat treatment process includes the following components 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 The trace elements, and the non-removable trace elements ≤0.05%.

[0027] A heat treatment process for engine guards, according to the following steps:

[0028] (1) Normalizing: the engine shield after casting is subjected to the second normalizing treatment, the specific operation is: before the first normalizing, the temperature of the shield is 680℃, the temperature is kept for 3h, and then the temperature is raised for the first normalization. Fire; the temperature of the first normalizing is increased to 860℃ and the temperature is kept for 2h; after that, it is air-cooled to 380℃; before the second normalizing, the temperature of the shield is put into the furnace at 340℃, the temperature is kept for 4h, and then the temperature is increased...

Embodiment 2

[0033] The quenched and tempered steel for the engine cover for the heat treatment process includes the following components 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 The trace elements, and the non-removable trace elements ≤0.05%.

[0034] A heat treatment process for engine guards, according to the following steps:

[0035] (1) Normalizing; the engine shield after casting is subjected to secondary normalizing treatment, the specific operation is: before the first normalizing, the temperature of the shield is 690℃, the temperature is maintained for 3.5h, and then the temperature is raised for the first time Normalizing; the temperature of the first normalizing is raised to 880℃ and holding for 2.5h; after that, it is air-cooled to 390℃; before the second normalizing, the temperature of the shield is put into the furnace at 350℃, holding for 4.5h, then heating to 700℃, Keep the temperature for 3.2h; then in...

Embodiment 3

[0040] The engine guard quenched and tempered steel used for the heat treatment process includes the following components 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 The trace elements, and the non-removable trace elements ≤0.05%.

[0041] A heat treatment process for engine guards, according to the following steps:

[0042] (1) Normalizing; the engine shield after casting is subjected to the second normalizing treatment, the specific operation is: before the first normalizing, the temperature of the shield is 700 ℃, the heat preservation is 4h, and then the temperature is raised for the first normalization. Fire; the first normalizing heats up to 900℃ and keeps it for 3h; then air-cools to 400℃; before the second normalizing, put the shield into the furnace at 360℃, keep it for 5h, then raise it to 720℃, keep it for 3.5h ; Then the temperature is increased for the second normalizing; the second normalizing i...

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PUM

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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 specifically relates to a heat treatment process for an engine shield. Background technique [0002] The automobile engine guard is a shell component used to carry the automobile engine and 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 guard is extremely critical. Among them, heat treatment is a process that heats a metal workpiece to a certain temperature and keeps it at this temperature for a certain period of time, then puts it in oil or water and cools it at different speeds, and controls its performance by changing the appearance of the metal material or the internal structure. [0003] At present, the shortcomings of the traditional heat treatment process of the shield are as follows: [0004] (1) The heat treatment process after forging is mostly normalizing + ...

Claims

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Application Information

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Patent Type & Authority Applications(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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