CN103484635A - Metal material surface modification method - Google Patents
Metal material surface modification method Download PDFInfo
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- CN103484635A CN103484635A CN201210189658.2A CN201210189658A CN103484635A CN 103484635 A CN103484635 A CN 103484635A CN 201210189658 A CN201210189658 A CN 201210189658A CN 103484635 A CN103484635 A CN 103484635A
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Abstract
A metal material surface modification method belongs to the technical field of metal material surface modification, and is characterized in that: a processing punch, which acts on the metal material surface, rotates in a high speed while vibrating in a high frequency at the same time, thus mechanical impacts and rotary frictions are generated on the metal material surface, so deformation and refining of crystal particles happen in the surface layer of the metal material because of repeat plastic deformation, and thus the surface modification of metal material is achieved. The head shape of the processing punch is in an arc shape, a ball shape or a frustum shape. The main processing parameters of the modification method comprise: impact force, impact frequency, rotation speed, move speed of the punch, overlap rate between two roads, pre-loaded pressure, and shape and size of the punch. The metal material surface modification method can form a modification layer, in which crystal particles has happened deformation and refining, on the metal material surface, and improves the surface stiffness and anti-fatigue performance of the material.
Description
Technical field:
The invention belongs to the metal surface properties modification technical field, a kind of processing method of improving metal material surface characteristics is provided.
Background technology
Under environment, the failure damage of a lot of metallic substance parts comes from surface under arms, as surface abrasion, surface corrosion, the crack initiation of surface fatigue crackle etc., therefore, as long as improve the material surface performance, just can extend the work-ing life of part.
Metal surface properties modification method commonly used has at present: surface heat is processed, top coat (plating, spraying, built-up welding, deposition etc.), surface alloying, surface self nanometer processing (ultrasonic shot peening, laser shock peening, ultrasonic impact nanometer, revolving-rolling making Nano surface, mechanical mill are processed) etc.Wherein, surface self nanometer is processed and can be obtained the surface nano-structure layer in the situation that do not change material composition, its ultimate principle is to utilize shot-peening particulate, drift or laser blast wave to carry out high-frequency percussion to material surface, make material surface produce intense plastic strain repeatedly, the open grain structure of material surface gradually fragmentation to nanometer scale, in the certain thickness scope, by material surface to inner transition, grain-size increases gradually, until initial grain size does not have obvious interface between nano structure superficial layer and matrix.The acquisition of surface nanometer layer can improve material surface hardness, wear resistance and fatigue crack initiation drag, thereby improves the work-ing life of part.
Current surface self nanometer treatment process is only to utilize the shock action of effects on surface to realize surface modification, and needs to use special-purpose equipment, the equipment complexity, and applicable surface is narrow, and tooling cost is high.For this reason, the present invention proposes a kind of short-cut method that utilizes mechanical shock, spin friction to improve the material surface performance.
Summary of the invention
The invention provides a kind of method of metal surface properties modification, mechanical shock and the spin friction effect of utilization to metal material surface, make metallic substance, in surperficial certain thickness scope, viscous deformation repeatedly occur, make grain deformation, broken refinement, form stress in upper layer, hardness improves, thereby improves the performances such as Surface Wear Resistance of Materials, anti-fatigue performance.
Described metal surface properties modification method, it is characterized in that: the processing drift that acts on metal material surface is rotated and high-frequency vibration, metal material surface is produced to mechanical shock and spin friction effect, make metal material surface, due to viscous deformation repeatedly, grain deformation and refinement occur, thereby realize the surface modification of metallic substance.
The nose shape of processing drift is arc, spherical or taper type, its high-frequency vibration and rotation can utilize electric hammer, electric pick, reciprocating drill to realize, also can design specialized, power tool that parameter is adjustable, to realize rotating speed, surging force, the isoparametric controllable adjustment of frequency of impact.
For different materials and different requirement, as the requirement to different modified layer thickness, different degree of grain refinement and different hardness, by adjusting machined parameters, meet the demands, main parameter comprises: Duplication, precompression, punch shape and size between surging force, frequency of impact, speed of rotation, drift translational speed, twice.
Principle of the present invention: metal material surface is carried out to the mechanical shock effect by drift, make the material in surperficial certain thickness scope that viscous deformation repeatedly occur, the spin friction effect makes the top layer metal produce shearing strain, motion and the propagation of top layer metal Deformation Induced dislocation repeatedly, original grain deforms or the dislocation wall of being bred is cut apart, be refined as gradually fine grained texture, refined crystalline strengthening and work hardening effect improve the top layer metal hardness, surface fatigue crack initiation resistance has improved in top layer fine grained texture, and internal layer not the open grain structure of deformable metal improved the inwardly resistance of expansion of crackle, thereby make the wear resistance of material surface, anti-fatigue performances etc. are improved.
Embodiment
Machining sketch chart is shown in accompanying drawing 1, to process drift (2) is arranged on power tool (1), power tool (1) can adopt electric hammer, reciprocating drill, electric pick (only to impact, do not rotate) or custom-designed power tool, make drift perpendicular to workpiece (3) surface, apply certain precompression and make to process drift (2) workpiece pressing (3), starting power tool (1) makes to process drift (2) and rotates and produce vibratory impulse, it is mobile on workpiece (3) surface that mobile electric instrument (1) drives drift (2), completes impact and the spin friction of whole work surface are processed.Accompanying drawing 2 is the schematic diagram of processing drift (2) mobile a kind of mode on workpiece (3) surface, processing drift (2) is started to move according to band arrow rectilinear direction reciprocating linear in figure by workpiece (3) edge, shift to the other side on one side by workpiece, until complete the processing to whole surface.When drift moves, certain Duplication is arranged between adjacent twice, to guarantee to realize the covering processing to whole.
The end shape of processing drift as shown in Figure 3, can be arc (1), spherical (2), taper type (3), processing drift tail diameter is determined according to power tool chuck size, be generally diameter 8-10mm, the radius-of-curvature of head circular arc, ball or frustum end diameter reach the requirement of modified layer are selected according to machined material, and are complementary with other parameters such as surging force, translational speeds.
The scanning electron microscope pattern that accompanying drawing 4 is a low-Carbon steel specimen cross section after impact and spin friction processing, left side is specimen surface, processing conditions: power tool adopts electric hammer, single-impact power 1.5J, 3900 times/min of frequency of impact, turn/min of rotating speed 850, fixed point processing 5 minutes.Can find out, the surface thick deformation layer of 20-30 μ m of having an appointment, in deformation layer, crystal grain becomes the streamline shape and refinement occurs.Accompanying drawing 5 is microhardness (HV) distribution schematic diagram on the rear sample of processing cross section, in figure on X-coordinate 1,2,3 ... 8 be on the sample cross section by surface to inner hardness test point code name, can find out, the hardness of surface deformation layer (1,2,3,4,5 points) higher than material internal hardness, and nearer apart from surface, hardness is higher.The distortion refinement of upper layer crystal grain and the raising of hardness are conducive to improve Surface Wear Resistance of Materials and anti-fatigue performance.
Claims (3)
1. a metal surface properties modification method, it is characterized in that: the processing drift that acts on metal material surface is rotated and high-frequency vibration, metal material surface is produced to mechanical shock and spin friction effect, make metal material surface layer, due to viscous deformation repeatedly, grain deformation and refinement occur, thereby realize the surface modification of metallic substance.
2. method of modifying according to claim 1, the nose shape of processing drift is arc, spherical or taper type.
3. method of modifying according to claim 1, main machined parameters comprises: Duplication, precompression, punch shape and size between surging force, frequency of impact, speed of rotation, drift translational speed, twice.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210189658.2A CN103484635A (en) | 2012-06-11 | 2012-06-11 | Metal material surface modification method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210189658.2A CN103484635A (en) | 2012-06-11 | 2012-06-11 | Metal material surface modification method |
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| CN103484635A true CN103484635A (en) | 2014-01-01 |
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| CN201210189658.2A Pending CN103484635A (en) | 2012-06-11 | 2012-06-11 | Metal material surface modification method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103820622A (en) * | 2014-03-07 | 2014-05-28 | 山东建筑大学 | Multiple-bump punch used for surface modification of material |
| CN104799925A (en) * | 2015-04-28 | 2015-07-29 | 山东航维骨科医疗器械股份有限公司 | Metal implant with high-density surface for orthopedics department |
| CN105861797A (en) * | 2016-05-27 | 2016-08-17 | 中国科学院金属研究所 | Rotary pressing tool and rotary pressing strengthening method of metal surface |
| CN106271383A (en) * | 2015-05-19 | 2017-01-04 | 天津大学 | A kind of ultrasonic impact and light decorations are utilized to combine the method improving metal part surface performance |
| CN111926161A (en) * | 2020-09-04 | 2020-11-13 | 吉林大学 | Metal material surface strengthening method and device |
| CN112795753A (en) * | 2020-12-25 | 2021-05-14 | 兰州理工大学 | Surface strengthening device and strengthening method for large-diameter metal pipe |
| CN113084743A (en) * | 2021-03-15 | 2021-07-09 | 南京航空航天大学 | Modifying tool for metal surface function reconstruction and manufacturing method thereof |
| CN113621790A (en) * | 2021-09-03 | 2021-11-09 | 南昌航空大学 | High-speed impact-based efficient surface modification method and device |
| EP4086364A4 (en) * | 2019-12-30 | 2023-08-23 | Nanjing University of Aeronautics and Astronautics | Progressive metallic surface micro-nano modification method |
Citations (3)
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| JP2005298879A (en) * | 2004-04-09 | 2005-10-27 | Nippon Steel Corp | Method for producing metal product having fine crystallized surface layer part |
| CN1924030A (en) * | 2005-08-30 | 2007-03-07 | 宝山钢铁股份有限公司 | Metal surface nanolizing method of supersonic wave high-energy surface machinery processing |
| CN101078036A (en) * | 2007-06-22 | 2007-11-28 | 燕山大学 | Surface nano method for silicon-containing high-carbon steel 9SiCr |
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2012
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2005298879A (en) * | 2004-04-09 | 2005-10-27 | Nippon Steel Corp | Method for producing metal product having fine crystallized surface layer part |
| CN1924030A (en) * | 2005-08-30 | 2007-03-07 | 宝山钢铁股份有限公司 | Metal surface nanolizing method of supersonic wave high-energy surface machinery processing |
| CN101078036A (en) * | 2007-06-22 | 2007-11-28 | 燕山大学 | Surface nano method for silicon-containing high-carbon steel 9SiCr |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103820622A (en) * | 2014-03-07 | 2014-05-28 | 山东建筑大学 | Multiple-bump punch used for surface modification of material |
| CN104799925A (en) * | 2015-04-28 | 2015-07-29 | 山东航维骨科医疗器械股份有限公司 | Metal implant with high-density surface for orthopedics department |
| CN106271383A (en) * | 2015-05-19 | 2017-01-04 | 天津大学 | A kind of ultrasonic impact and light decorations are utilized to combine the method improving metal part surface performance |
| CN105861797A (en) * | 2016-05-27 | 2016-08-17 | 中国科学院金属研究所 | Rotary pressing tool and rotary pressing strengthening method of metal surface |
| EP4086364A4 (en) * | 2019-12-30 | 2023-08-23 | Nanjing University of Aeronautics and Astronautics | Progressive metallic surface micro-nano modification method |
| CN111926161A (en) * | 2020-09-04 | 2020-11-13 | 吉林大学 | Metal material surface strengthening method and device |
| CN112795753A (en) * | 2020-12-25 | 2021-05-14 | 兰州理工大学 | Surface strengthening device and strengthening method for large-diameter metal pipe |
| CN113084743A (en) * | 2021-03-15 | 2021-07-09 | 南京航空航天大学 | Modifying tool for metal surface function reconstruction and manufacturing method thereof |
| CN113621790A (en) * | 2021-09-03 | 2021-11-09 | 南昌航空大学 | High-speed impact-based efficient surface modification method and device |
| CN113621790B (en) * | 2021-09-03 | 2022-12-23 | 南昌航空大学 | High-speed impact-based efficient surface modification method and device |
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Application publication date: 20140101 |