- Email: [email protected]
Effect of electric current on the frictional wear of metal parts
Optimum sulfurizing time and case depths obtainable during that time; agreement between authors’ results and data given by E. 1’. Nadcnskaya [B.T.3 # 6881 ; amenabrhty of medium carbon steel to sulfur impregnation compared with NipCr low alloy steel; details on layers making up the sulfurized case; mechanism underlying the low friction coefficient. (No. 4109, $13.20) Effect of Austempering on the Wear Resistance of Carbon Steel. A. A. Soroko-Novitskaya. Metalloved. i Tevmichesk. Obrabotka Metal., iVo. 4 (1959) 52-3; 2 tables, 350 words. Abrasive wear resistance of carbon steels (0.80,
I .o, and I .2 0/0C) as affected by austempering. Wear testing procedure and results (Table 2). Temperature range of austempering media giving the best combination of mechanical properties. (No. 4574, $2.00) Effect of Electric Current on the Frictional Wear of Metal Parts. P. L. Gordienko and S. L. Gordienko. Vestnik Machinostroeniya, 32, No. 7 (1952) 38; 3 figs., 500 words. Lack of data on electrical phenomena ac-
companying dry and sem-dry friction of metals. Authors’ study of effect of electric current on wear of tin bronze against steel under semi-dry friction. Experimental setup (Fig. I) and procedure. Details on four influencing factors on wear of bronze specimens (Figs. 2a, b, c, d) and numerical results 01). tained in experiments (Fig. 3). Similarity of effect with that observed in electro-erosive machining of metals. (No. 4933, $2.00) On the Properties and Structure of Phosphate Coatings. V. Cupr. Metallobevfliichr, 13 (1960) BIGBr; 1200 words. Study of chemical composition and crystal structure of phosphate coatings with special consideration of the changes they undergo when being dried and when subjected to pressure in the various cold shaping processes. Particulars on coating samples used in study. Aging process with phosphate coatings; its duration and the changes it causes. Why are phosphate coatings able to stand up under temperatures up to 1830’F during shaping operations. Substitution of Fe for Zn ions in older phosphating solutions : resulting need for frequent replacement (No. 4783,$2.90)
6. ANALYSIS AND TESTING
Radiotracer Study of Piston Rings and Cylinder Liner Wear in a Diesel Engine. R. B. Price, D. N. Sunderman, A. W. Carey Jr., W. S. Diethorn and N. J. Beck. Lubrication Eng., 18 (2) (1961) 56-63; IO figs., 2 tables, 7 refs. A radiotracer study of wear in an eightcylinder diesel engine is discussed. Wear is determined by measuring continuously the radioactive wear debris circulated in the engine oil. The wear debris is tagged with radioactive iron-59 and chromium-5r by ir-
radiating selected engine parts in a nuclear reactor. Wear results are reported for piston rings and cylinder liner over a range of engine load, speed, and cooling water temperature. Break-in, steady-state, and transient wear rates are determined. Top and bottom face in addition to front face ring wear was observed. Wear debris was monitored in the exhaust gas as well as in the lubricating oil. The most significant relation developed was the V-shape pattern of ring wear rate plotted I)~YSUS engine speed.
7. MAINTENANC :E (no abstracts) 8.
MACHINING
An Experimental Investigation of Temperature Distribution at Tool-Flank Surface. B. T. Chao, H. L. Li and K. J. Trigger. J. Eng. for Industry (ASME Trans., Ser. B) , 83 (4) (1961)
496-504.
The measurement of temperature distribution at the flank surface of a cutting tool is characterized by the extremely small extent of the surface over which the temperature field is explored. This paper describes a technique which makes use of a moving lead-sulfide, photoconductive, infrared radiation detector. The surface in question is quickly scanned by the detector’s view field. For the level of temperature encountered, data are reprodu-
*ENDTOOL
WEAR
cible and the method may be used to determine temperature distribution over sliding contacts in general. From the measured flank surface temperatures, tool-chip interface temperature distribution was deduced, using geometrical electric analog. Some Controlled Metal-Cutting Studies With Resulfurized Steels. E. G. Thomsen, S. Kobayashi and M. C. Shaw-. J. Eng.
for
83 (4) (1961)
Industry
(ASME
Trans.
Ser. B),
513-522.
Cutting tests, including controlled tool-chip contact area and controlled artificial flank wear-land studies, were made with five resulWear.
j
(1962)
247-2jj
I .o, and I .2 0/0C) as affected by austempering. Wear testing procedure and results (Table 2). Temperature range of austempering media giving the best combination of mechanical properties. (No. 4574, $2.00) Effect of Electric Current on the Frictional Wear of Metal Parts. P. L. Gordienko and S. L. Gordienko. Vestnik Machinostroeniya, 32, No. 7 (1952) 38; 3 figs., 500 words. Lack of data on electrical phenomena ac-
companying dry and sem-dry friction of metals. Authors’ study of effect of electric current on wear of tin bronze against steel under semi-dry friction. Experimental setup (Fig. I) and procedure. Details on four influencing factors on wear of bronze specimens (Figs. 2a, b, c, d) and numerical results 01). tained in experiments (Fig. 3). Similarity of effect with that observed in electro-erosive machining of metals. (No. 4933, $2.00) On the Properties and Structure of Phosphate Coatings. V. Cupr. Metallobevfliichr, 13 (1960) BIGBr; 1200 words. Study of chemical composition and crystal structure of phosphate coatings with special consideration of the changes they undergo when being dried and when subjected to pressure in the various cold shaping processes. Particulars on coating samples used in study. Aging process with phosphate coatings; its duration and the changes it causes. Why are phosphate coatings able to stand up under temperatures up to 1830’F during shaping operations. Substitution of Fe for Zn ions in older phosphating solutions : resulting need for frequent replacement (No. 4783,$2.90)
6. ANALYSIS AND TESTING
Radiotracer Study of Piston Rings and Cylinder Liner Wear in a Diesel Engine. R. B. Price, D. N. Sunderman, A. W. Carey Jr., W. S. Diethorn and N. J. Beck. Lubrication Eng., 18 (2) (1961) 56-63; IO figs., 2 tables, 7 refs. A radiotracer study of wear in an eightcylinder diesel engine is discussed. Wear is determined by measuring continuously the radioactive wear debris circulated in the engine oil. The wear debris is tagged with radioactive iron-59 and chromium-5r by ir-
radiating selected engine parts in a nuclear reactor. Wear results are reported for piston rings and cylinder liner over a range of engine load, speed, and cooling water temperature. Break-in, steady-state, and transient wear rates are determined. Top and bottom face in addition to front face ring wear was observed. Wear debris was monitored in the exhaust gas as well as in the lubricating oil. The most significant relation developed was the V-shape pattern of ring wear rate plotted I)~YSUS engine speed.
7. MAINTENANC :E (no abstracts) 8.
MACHINING
An Experimental Investigation of Temperature Distribution at Tool-Flank Surface. B. T. Chao, H. L. Li and K. J. Trigger. J. Eng. for Industry (ASME Trans., Ser. B) , 83 (4) (1961)
496-504.
The measurement of temperature distribution at the flank surface of a cutting tool is characterized by the extremely small extent of the surface over which the temperature field is explored. This paper describes a technique which makes use of a moving lead-sulfide, photoconductive, infrared radiation detector. The surface in question is quickly scanned by the detector’s view field. For the level of temperature encountered, data are reprodu-
*ENDTOOL
WEAR
cible and the method may be used to determine temperature distribution over sliding contacts in general. From the measured flank surface temperatures, tool-chip interface temperature distribution was deduced, using geometrical electric analog. Some Controlled Metal-Cutting Studies With Resulfurized Steels. E. G. Thomsen, S. Kobayashi and M. C. Shaw-. J. Eng.
for
83 (4) (1961)
Industry
(ASME
Trans.
Ser. B),
513-522.
Cutting tests, including controlled tool-chip contact area and controlled artificial flank wear-land studies, were made with five resulWear.
j
(1962)
247-2jj