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Composite modification sealing friction pair of laser texturing and alloyage and processing method thereof

A technology of sealing friction and compound modification, which is applied in the direction of engine sealing, metal processing equipment, manufacturing tools, etc., can solve the problems of not considering the impact of the wear resistance of the sealing ring, high friction coefficient of the sealing friction pair, wear, etc., to achieve Improve friction and wear properties, improve surface wear resistance, and reduce wear rate

Inactive Publication Date: 2009-09-09
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing research focuses on improving the thickness and stiffness of the liquid film under the condition of full oil lubrication, but does not consider the impact on the wear resistance of the sealing ring under the condition of lean oil and dry friction, let alone from the perspective of material surface modification to improve wear performance in lean and dry friction conditions
[0004] In short, the defects of the prior art are: the friction coefficient of the sealing friction pair is still high under the condition of lean oil and dry friction, and the wear is serious

Method used

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  • Composite modification sealing friction pair of laser texturing and alloyage and processing method thereof
  • Composite modification sealing friction pair of laser texturing and alloyage and processing method thereof
  • Composite modification sealing friction pair of laser texturing and alloyage and processing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Embodiment 1: 45 steel sealing rings (outer diameter 44mm, inner diameter 36mm, thickness 8mm, hardness HRC25, its chemical composition (wt%) are C: 0.46; Mn: 0.67; Si: 0.28; P: 0.017; S: 0.025 ; Cr: 0.04) polished to Ra = 0.02 ~ 0.04 μm, ultrasonically cleaned with acetone for 3 minutes;

[0021] Use a Nd:YAG pulse laser with a wavelength of 1064nm, an output pulse energy of 30μJ, a pulse frequency of 1-100Hz, and a pulse width of 450-500ns to process the surface of the sealing material such as figure 1 Shown are micropores with a diameter of 200 μm, a depth of 20–30 μm, a circumferential distance of 300 μm, an axial distance of 300 μm, and a density of 20.9%.

[0022] Put the etched micromodeling sample into a 15KW double-glow plasma metallization furnace, and use it as the cathode, with pure chromium (φ100mm×5mm, purity 99.9%) as the source, the distance between the cathode and the source is 20mm, and the furnace is evacuated to 1.0×10 -2 Pa, fill 99.9% high-purity...

Embodiment 2

[0027] Embodiment 2: 45 steel seal rings (outer diameter 44mm, inner diameter 36mm, thickness 8mm, hardness HRC25, its chemical composition (wt%) is C: 0.46; Mn: 0.67; Si: 0.28; P: 0.017; S: 0.025 ; Cr: 0.04) polished to Ra = 0.02 ~ 0.04 μm, ultrasonically cleaned with acetone for 3 minutes;

[0028] Use Nd:YAG pulsed laser (laser wavelength: 1064nm; laser output pulse energy: 30μJ; laser pulse frequency: 1-100Hz; laser pulse width: 450-500ns) to process such as figure 1 Shown are micropores with a diameter of 100 μm, a depth of 20-30 μm, a circumferential distance of 800 μm, an axial distance of 800 μm, and a density of 2%.

[0029] Put the sample that has undergone laser micromodeling into a 15KW double-glow plasma metallization furnace, and use it as the cathode, with pure molybdenum (φ100mm×5mm, purity 99.9%) as the source, the distance between the cathode and the source is 20mm, and the furnace is evacuated to 1.0×10 -2 Pa, fill 99.9% high-purity argon gas to 40-45Pa, w...

Embodiment 3

[0034] Embodiment 3: 45 steel rings (outer diameter 44mm, inner diameter 36mm, thickness 8mm, hardness HRC25, its chemical composition (wt%) are C: 0.46; Mn: 0.67; Si: 0.28; P: 0.017; S: 0.025; Cr: 0.04) polished to Ra=0.02~0.04μm, ultrasonic cleaning with acetone for 3min;

[0035] Use Nd:YAG pulsed laser (laser wavelength: 1064nm; laser output pulse energy: 30μJ; laser pulse frequency: 1-100Hz; laser pulse width: 450ns) to process the sealing material surface such as figure 2 Shown are grooves with a length of 5 mm, a width of 100 μm, a depth of 20-30 μm, perpendicular to the rubbing direction, and a pitch of 500-800 μm radially distributed at equal intervals.

[0036] Put the sample after laser micro-modelling, polishing and cleaning into a 15KW double-glow plasma metallization furnace, and use it as the cathode, with pure Mo (φ100mm×5mm, purity 99.9%) as the source, the distance between the cathode and the source is 20mm, the furnace Internal vacuum to 1.0×10 -2 Pa, fil...

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Abstract

The invention discloses a composite modification sealing friction pair of laser texturing and alloyage and a processing method thereof. The surface of the material alloyage comprises texturing. The surface of the material alloyage of the friction pair is the surface of plasma chromium impregnation or molybdenum impregnation. The texturing on the surface of the friction pair materials is a miniature hole or a groove. The processing method based on the sealing friction pair comprises the following steps: first, a sealing sample is polished and treated and cleaned by ultra audible sound; then, the surface of the polished sealing sample is sculptured with texturing by a pulse laser; and finally, after being sculptured with the texturing, the sample carries out plasma chromium impregnation or molybdenum impregnation treatment. The sealing friction pair reduces the friction coefficient of a sealing friction pair by using laser texturing and improves the surface friction resistance performance by using the surface alloyage. The composite modification of the laser surface texturing and the surface alloyage improves the frictional wear performance of the sealing friction pair in the states of lean oil and dry friction. The processing method of the sealing friction pair is simple and easy to carry out and convenient to implement.

Description

technical field [0001] The invention belongs to a modified sealing friction pair and a surface composite modification method, in particular to a sealing friction pair modified by laser micro-modeling and alloying and a processing method. Background technique [0002] The dynamic seal of the transmission mechanism of a heavy-duty vehicle usually works under the severe conditions of high pressure (P), high speed (V), and poor oil. Due to the increase of the sealing pressure, the seal is usually in a state of no oil or less oil during the start-up process. Poor lubrication status will cause greater damage to the sealing surface and will accelerate failure. In addition, the bearing capacity of the parallel contact seal oil film is limited, and the thickness of the oil film becomes thinner under high pressure, resulting in too much metal-to-metal contact, which is in a state of mixed friction, with a high friction coefficient, severe wear, and burnout. In order to improve the pe...

Claims

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Application Information

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IPC IPC(8): F16J15/16B24B1/00B23K26/36C23C10/08C23C10/10B23K26/362B23K26/364
Inventor 熊党生李建亮万轶戴基卉
Owner NANJING UNIV OF SCI & TECH
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