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42CrMo or 40Cr steering knuckle nitrocarburizing treatment process

A treatment process and steering knuckle technology, which is applied in the field of nitrocarburizing treatment of 42CrMo or 40Cr steering knuckles, to achieve the effect of enhancing bending resistance

Inactive Publication Date: 2014-06-25
HEFEI AAM AUTOMOBILE DRIVELINE & CHASSIS SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the disadvantages of the existing salt bath nitrocarburizing that the co-infiltration effect is poor, and to provide a 42CrMo or 40Cr steering knuckle Soft nitriding treatment process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1, comprises the following steps:

[0022] 1) Process the 42CrMo steering knuckle to the finished product size and perform modulation treatment at a temperature of 580°C; quenching and tempering hardness of 28HRC.

[0023] 2) Cleaning of the workpiece: Check the surface of the workpiece if there are decarburized layers, rust spots, sharp corners, and sharp edges, which need to be polished. If there is no such situation by visual inspection, then clean it. When cleaning the workpiece, first wash off the surface oil with alkali for 20 minutes, then move to the rinsing tank to wash off the surface cleaning solution with water, and rinse for 5-10 minutes;

[0024] 3) Steering knuckle preheating: move the workpiece to the preheating furnace, the temperature of the preheating furnace is 370°C (holding temperature), and the holding time is 35 minutes.

[0025] 4) Steering knuckle nitrocarburization: the steering knuckle is moved to the nitriding furnace at a temper...

Embodiment 2

[0027] Embodiment 2, comprises the following steps:

[0028] 1) Process the 40Cr steering knuckle to the finished product size, and perform modulation treatment at a temperature of 580°C; quenching and tempering hardness of 28HRC.

[0029] 2) Cleaning of the workpiece: Check the surface of the workpiece if there are decarburized layers, rust spots, sharp corners, and sharp edges, which need to be polished. If there is no such situation by visual inspection, then clean it. When cleaning the workpiece, first wash off the surface oil with alkali for 20 minutes, then move to the rinsing tank to wash off the surface cleaning solution with water, and rinse for 5-10 minutes;

[0030] 3) Steering knuckle preheating: move the workpiece to the preheating furnace, the temperature of the preheating furnace is 370°C (holding temperature), and the holding time is 35 minutes.

[0031] 4) Steering knuckle nitrocarburization: the steering knuckle is moved to the nitriding furnace at a tempera...

Embodiment 3

[0033] Embodiment 3, comprises the following steps:

[0034] 1) Process the 42CrMo steering knuckle to the finished product size and perform modulation treatment at a temperature of 580°C; quenching and tempering hardness of 28HRC.

[0035] 2) Cleaning of the workpiece: Check the surface of the workpiece if there are decarburized layers, rust spots, sharp corners, and sharp edges, which need to be polished. If there is no such situation by visual inspection, then clean it. When cleaning the workpiece, first wash off the surface oil with alkali for 20 minutes, then move to the rinsing tank to wash off the surface cleaning solution with water, and rinse for 5-10 minutes;

[0036] 3) Steering knuckle preheating: move the workpiece to the preheating furnace, the temperature of the preheating furnace is 370°C (holding temperature), and the holding time is 35 minutes.

[0037] 4) Steering knuckle nitrocarburization: the steering knuckle is moved to the nitriding furnace at a temper...

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PUM

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Abstract

The invention relates to a 42CrMo or 40Cr steering knuckle nitrocarburizing treatment process. The treatment process comprises the following steps: (1) hardening and tempering a steering knuckle at the temperature of 580+ / -5 DEG C until reaching the tempering hardness of 24HRC to 30HRC (Rockwell Hardness); (2) cleaning the steering knuckle after being hardened and tempered so as to remove oil dirts from the surface of the steering knuckle; (3) preheating the steering knuckle at the temperature of 370+ / -10 DEG C; (4) transferring the steering knuckle into a nitrogenation oven and soaking the steering knuckle in a cyanide carbonitriding medium for salt bathing under conditions that the temperature ranges from 570 DEG C to 620 DEG C, the value of CNO<-> of a fused salt ranges from 38% to 50% and the air flux ranges from 400L / h to 600L / h; and (5) taking the steering knuckle from the oven, boiling the steering knuckle in 5% to 10% of Na2CO3 aqueous solution for 10 to 15 minutes, neutralizing the steering knuckle in 2% of boiling phosphoric acid solution, washing the steering knuckle in 10% of copper sulfate or ferrous sulfate solution at a room temperature and scouring the steering knuckle in cold water for more than 25 minutes at the room temperature. The method has the advantages that the nitrocarburizing treatment of the whole steering knuckle is carried out, so that the problems that the steering knuckle is complicated in structure and shape, multiple in thickness changes, large in gradient and difficult in heat treatment control are solved; and meanwhile, the bending resistance and the torsion resistance of components and parts are enhanced by virtue of the nitrocarburizing treatment carried out on the whole steering knuckle.

Description

Technical field: [0001] The invention relates to a method for salt bath nitrocarburizing of metal surfaces, in particular to a nitrocarburizing process for steering knuckles with complex structures of 42CrMo or 40Cr, which can make the structure compact, The shape is complex, the thickness of the parts changes, and the bending, torsion and impact resistance of mechanical parts are enhanced. Background technique: [0002] The steering knuckle is one of the main parts on the steering axle of the car, which can make the car run stably and transmit the driving direction sensitively. The function of the steering knuckle is to bear the front load of the car, support and drive the front wheel to rotate around the kingpin to make the car turn. When the car is running, it bears variable impact loads, so it is required to have high strength. The conventional heat treatment process of the steering knuckle is high-frequency quenching at the bearing neck after quenching and tempering,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/56
Inventor 王解生唐自玉班景能王国花
Owner HEFEI AAM AUTOMOBILE DRIVELINE & CHASSIS SYST