CN1027765C - Method for increasing the fatigue life of electrocoated member - Google Patents
Method for increasing the fatigue life of electrocoated member Download PDFInfo
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- CN1027765C CN1027765C CN92105874A CN92105874A CN1027765C CN 1027765 C CN1027765 C CN 1027765C CN 92105874 A CN92105874 A CN 92105874A CN 92105874 A CN92105874 A CN 92105874A CN 1027765 C CN1027765 C CN 1027765C
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- Prior art keywords
- shot
- peening
- coating
- fatigue life
- roll extrusion
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
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- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
The present invention relates to a method for extending the fatigue life of an electroplated member. Electroplating relates to a surface engineering technique with a wide application range; however, the fatigue life of plated member is obviously shortened (by approximately 30%) for the main reason that a great number of cracks and similar cracks exist in a plating layer of which the inner stress number value is as high as a pulling stress state. The present invention adopts shot-blasting or press-rolling technology to carry out cold-work hardening treatment for the surfaces of plating layers and also provides the parameters of the two technologies. Therefore, the application of the method can make the plating layers and the surface of the basal body generate a compression stress layer, and accordingly, the fatigue life of plated materials is a bit higher than that of original members which are not plated.
Description
The present invention relates to a kind of brush that improves and plate the tired member method in work-ing life.
Brush plating is widely applied on the tired member, and the brush plating can make the member resizing, strengthens hardness, wear-resisting, anticorrosion, antimagnetic etc.But a large amount of practices and analytical proof: after middle high-strength steel is handled through technique of brush plating, tangible reduction (approximately reducing by 30%) is arranged its fatigue strength and fatigue lifetime.Up to the present, yet there are no and solve the way that tired member after the brush plating reduces work-ing life.
Measure through scanning electron microscopic observation and X-ray measuring stress instrument, have a large amount of crackles and class crackle in the nickel coating, the coating internal stress is tensile stress state usually, and numerical value is higher; The acting in conjunction of the interior residual tension of defective and coating has just caused the reduction of matrix fatigue strength in the coating, and wherein the coating residual tension is more main factor.Characteristics and the brush of considering the electrocrystallization deposition plate processing parameter change unavoidable when operating, middle low strength steel coating is interior if will thoroughly avoid defective to be difficult to realize, even if plating defect is less, because the coating internal stress is bigger, being superimposed with behind the little plus load on a small quantity so, number of cycles just can make coating crack.Therefore, if will improve the state that the fatigue strength of matrix after the brush plating should at first improve the unrelieved stress of coating surface layer.
According to above-mentioned analysis, the purpose of this invention is to provide a kind of method that improves the work-ing life of the tired member after brush plates.
Task of the present invention is to solve like this: brush plating member is adopted shot-peening or rolling technology, promptly cold working hardening is carried out on its surface and handled, make brushing coating and matrix top layer produce compressive stress layer, thereby improve the fatigue strength after the material brush plating.
Shot-blast process parameter behind the quick nickel of brush plating: glass bullet diameter 0.15～0.25mm, shot-peening air pressure stress 0.15～0.30MPa, jet length 150～300mm, shot peening strength f=0.1A～0.2A.
The quick nickel processing parameter of brush plating again behind the shot-peening: steel bomb ball diameter 0.8～1.0mm, shot-peening air pressure stress 0.20～0.30MPa, jet length 180～250mm, shot peening strength f=0.25～0.35A.
Rolling technology parameter: test specimen rotating speed 370～470r/min, rolling wheel feed 0.30～0.40mm/r, roll extrusion surplus 10～30 μ m.
The S-N curve of respectively organizing test specimen of Fig. 1 shot peening
The amplification relation curve of thickness of coating and fatigue strength after Fig. 2 roll extrusion
The brush plating test specimen of the different thickness of coating of Fig. 3 after roll extrusion fatigue lifetime change curve
The coating internal stress is with the change curve of thickness of coating after Fig. 4 roll extrusion
The advantage that the present invention compared with prior art has is: owing to the tired member of brush plating is executed real shot-peening or roll extrusion processing, make brushing coating and matrix surface produce compressive stress layer, make omit high the fatigue life of the original brush plating member of fatigue life ratio of Brush Plating member.
The invention will be further described with embodiment below:
Brush plating member is adopted shot-peening or rolling technology, cold working hardening is carried out on its surface handled, make brushing coating and matrix top layer produce compressive stress layer.Shot-peening can be divided into plating back shot-peening and earlier to two kinds of brush platings behind the matrix shot-peening, every kind is divided brush plating different thickness again.
First kind of situation:
No. 40 steel brushes are plated shot-peening behind the quick nickel.The thick 0.12mm of coating, bullet diameter 0.2mm, shot-peening air pressure stress 0.20MPa, jet length 200mm, shot peening strength f=0.1A.
Result is as follows:
The thick safe range of stress σ of the thick spray back coating of sequence number coating
-1Shot-peening σ not
-1σ
-1Amplification
（mm） （mm） （MPa） （MPa） （%）
1 0.12 0.10 240 179.8 33.4
2 0.05 0.045 249.7 214.7 16.3
No. 40 steel brushes plate shot-peening behind the quick nickel.The thick 0.12mm of plating brush, glass bullet diameter 0.25mm, shot-peening air pressure stress 0.25MPa, jet length 250mm, shot peening strength f=0.2A.Result:
The thick safe range of stress σ of the thick spray back coating of sequence number coating
-1Shot-peening σ not
-1σ
-1Amplification
（mm） （mm） （MPa） （MPa） （%）
3 0.12 0.10 248.7 179.8 38.3
4 0.05 0.045 252.7 214.7 17.7
Second kind of situation:
To the quick nickel of brush plating again behind No. 40 steel shot-peenings.The thick 0.16mm of plating brush, steel bomb ball diameter 0.8mm, shot-peening air pressure stress 0.25Pa, jet length 200mm, shot peening strength f=0.3A.Result:
The thick safe range of stress σ of sequence number test coating
-1Shot-peening σ not
-1σ
-1Amplification
（mm） （MPa） （MPa） （%）
5 0.12 254.7 177.6 41.6
6 0.05 254.7 214.7 18.6
To the quick nickel of brush plating again behind No. 40 steel shot-peenings.The thick 0.12mm of coating, shot diameter 0.9mm, shot-peening air pressure stress 0.30MPa, jet length 250mm, shot peening strength f=0.35A.
Result is as follows:
The thick safe range of stress σ of sequence number test coating
-1Shot-peening σ not
-1σ
-1Amplification
（mm） （MPa） （MPa） （%）
7 0.12 256.8 177.6 44.6
8 0.05 255.7 214.7 19.1
Fig. 1 is the S-N curve of respectively organizing test specimen of shot peening, wherein: the 1st, plate quick nickel 0.12mm, not the S-N curve of shot-peening test specimen; The 2nd, matrix S-N curve; The 3rd, plate earlier and afterwards spray glass ball test specimen S-N curve; The 4th, the S-N curve of elder generation's spray shot test specimen.By adopting stress peening process all can improve the fatigue strength of brushing coating material before Fig. 1 curve and the visible brush plating of embodiment or after the brush plating.But both mechanism of action are incomplete same.Plating back shot peening mainly is the germinating expansion that stops crackle in the coating; Shot peening should be used bigger shot peening strength before the plating, to cause darker compressive stress layer, the fatigue strength of matrix itself is greatly improved.Brush plating on the matrix behind the shot-peening, crackle on the coating, class crackle are still the source of bringing out that causes MATRIX CRACKING, but because the fatigue resistance of matrix is higher, crackle enters the back or becomes nonpropagating crack or reduced propagation rate, thereby has improved safe range of stress or fatigue lifetime.
The roll extrusion parameter of roll extrusion embodiment one: test specimen rotating speed 400r/min, roll extrusion feed 0.35mm/r, roll extrusion surplus 20 μ m.To thickness of coating be 0.05,0.12, the test specimen 9-11 of 0.2mm, implement roll extrusion and handle back its safe range of stress result:
The sequence number thickness of coating is roll extrusion σ not
-1σ after the roll extrusion
-1Fatigue strength amplification
（mm） （MPa） （MPa） （%）
9 0.05 214.7 219.6 2.3
10 0.12 179.8 224.7 25.0
11 0.2 174.7 236.8 35.5
The roll extrusion parameter of roll extrusion embodiment two: test specimen rotating speed 450r/min, roll extrusion feed 0.30mm/r, roll extrusion surplus 25 μ m.To thickness of coating be 0.05,0.12, the test specimen 12-14 of 0.2mm, implement roll extrusion and handle back its safe range of stress result:
The sequence number thickness of coating is roll extrusion σ not
-1σ after the roll extrusion
-1Fatigue strength amplification
（mm） （MPa） （MPa） （%）
12 0.05 214.7 223.8 4.2
13 0.12 179.8 229.7 27.8
14 0.2 174.7 238.4 36.5
As can be seen from the above results, along with the increase of thickness of coating t, roll extrusion is effective more to the raising of fatigue strength.Basic change rule is seen Fig. 2.As seen from Figure 3, be subjected to the brush plating test specimen of same roll extrusion intensity, increase its fatigue lifetime of also corresponding increase with thickness of coating.Fig. 4 shows: brush plating test specimen has been through having removed the tensile stress on the coating basically after the roll extrusion, and increases with the thickness of coating, and stress also increases gradually.
Though thickness of coating is big more, it is many more that fatigue of materials intensity reduces, yet the big more roll extrusion of thickness of coating is good more to the raising in fatigue of materials intensity and life-span.Within the specific limits, roll extrusion intensity is big more, and the amplitude that fatigue strength improves is big more.
Claims (1)
1, a kind of method that improves fatigue life of electrocoated member is characterized in that brush plating member is adopted following shot-peening or any technology of roll extrusion:
1. shot-blast process behind the quick nickel of brush plating, its parameter is: glass bullet diameter 0.15～0.25mm, shot-peening air pressure stress 0.15～0.30MPa, jet length 150～300mm, shot peening strength f=0.1A～0.2A;
2. the quick nickel technology of brush plating again behind the shot-peening, its parameter is: steel bomb ball diameter 0.8～1.0mm, shot-peening air pressure stress 0.20～0.30MPa, jet length 180～250mm, shot peening strength f=0.25～0.35A;
3. rolling technology, its parameter is; Test specimen rotating speed 370～470r/min, rolling wheel feed 0.30～0.40mm/r, the roll extrusion surplus is 10～30 μ m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92105874A CN1027765C (en) | 1992-07-23 | 1992-07-23 | Method for increasing the fatigue life of electrocoated member |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92105874A CN1027765C (en) | 1992-07-23 | 1992-07-23 | Method for increasing the fatigue life of electrocoated member |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1081474A CN1081474A (en) | 1994-02-02 |
| CN1027765C true CN1027765C (en) | 1995-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN92105874A Expired - Fee Related CN1027765C (en) | 1992-07-23 | 1992-07-23 | Method for increasing the fatigue life of electrocoated member |
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| CN (1) | CN1027765C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EA201792285A1 (en) | 2015-04-17 | 2018-02-28 | Зе Юниверсити Оф Бритиш Коламбия | METHOD OF LEADING METAL SULFIDES BY REAGENTS THAT HAVE THIOCARBONILE FUNCTIONAL GROUPS |
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1992
- 1992-07-23 CN CN92105874A patent/CN1027765C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1081474A (en) | 1994-02-02 |
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