bearing and lubrication technology with special reference to i.c. motors
1
BOOK REVIEWS 331 Friction-Welding of Metals (Svarka metallov treniem) by V. I. VILL’, Mashgiz, Moscow, 1959; 87 pp., 47 figs., 5 tables, 26 refs. A description is given of the friction-welding process, in which two parts are joined by pressing them together under axial force when in mutual rotation. The typical sequence of events is that initially boundary friction occurs; this is rapidly replaced by seizure and the friction rises to a maximum. The friction then decreases as intense plastic deformation occurs and the temperature rises - in the case of steel, to goo-r3oo’C. Finally, at a chosen instant the rotation is stopped and the parts are allowed to cool under the axial force. The advantages of the process are economy in energy, adaptability to automation, speed of operation and the quality of the weld. The disadvantages are limitations in the shape of the parts being joined, due to a need for a circular or annular interface and for a degree of symmetry in the flow of heat from the two sides of the interface. The diameters of parts currently friction-welded range from 3.5 to zoo mm. The process can be used widely when two similar metals are to be joined, but less widely for dissimilar metals: steel-copper welds require preheating of one part; welds of aluminum to steel and to copper are unsatisfactory. The book also reviews theories of contact, friction and seizure, and discusses the temperature dependence of the friction forces. The practical procedures for selecting the rotational speed, axial force and duration of the welding cycle are outlined. The final chapters describe a number of practical friction-welding machines and list problems requiring further study. For translation see abstracts, Wear, 4 (1961) 173. F.W.S. Wear, 4 (1961) 33’ Lager- und Schmiertechnih insbesondere van Vwbrennungsmotoren (Bearing and lubrication tech- nology with special reference to i.c. motors) by REINHOLD KAMPS, with contributions on rolling bearing technology by HANS PERRET, VDI-Verlag GMBH, Diisseldorf, 1957; 8 chapters, 364 pp. 308 figs., 70 tables, zag refs.; 24 x 7 cm; D.M. 38.--. This is a fascinating book written by experienced engineers of the famous Daimler-Benz A.G., Stuttgart. It is a “how we do it” story, in essence told to a young engineer entering the works. It is assumed that the reader has had a sound education in engineering and can absorb and adapt from this book the specialized knowledge necessary for the design of modern bearings. Half of the monograph is dedicated to information on sliding and rolling bearings ; both materials and constructions are thoroughly reviewed with emphasis on the choice of materials. Then follows a valuable, more specialized section on bearings for i.c. engines, while the last part of the book, touching on other bearing and friction problems, is rather too short to be of real help to the novice. There are numerous references to practical experience from the D.-B. works and tables of hitherto unpublished data. Otherwise the treatment of materials and lubricants is based essentially on work of the British and American school, while the discussion of constructions refers more to original German work. The contributions by PERRET should be of interest to a wider circle of readers than is suggested by the title of the book. All interested in this field and with a sufficient command of German will find this low-priced monograph not only a richly illustrated collection of facts, but also a source of inspiration. G.Sa. Wear, 4 (1961) 331 On Fractures Caused by Explosions and Impacts. JOHN S. RINEHART. Quarterly of the Colorado School of Mines, Vol. 55, No. 4, Colorado School of Mines, Golden, Colorado, October 1960; 155 pp., g3 figs., 8 tables, 7 refs., $z.oo. Professor Rinehart has recently summarized his findings on “The role of stress waves in the com- minution of brittle, rocklike materials” in a contribution to an international Symposium “Stress Wear, 4 (1961) 331-33s
Transcript of bearing and lubrication technology with special reference to i.c. motors
BOOK REVIEWS 331
Friction-Welding of Metals (Svarka metallov treniem) by V. I. VILL’, Mashgiz, Moscow, 1959; 87 pp., 47 figs., 5 tables, 26 refs.
A description is given of the friction-welding process, in which two parts are joined by pressing them together under axial force when in mutual rotation. The typical sequence of events is that initially boundary friction occurs; this is rapidly replaced by seizure and the friction rises to a maximum. The friction then decreases as intense plastic deformation occurs and the temperature rises - in the case of steel, to goo-r3oo’C. Finally, at a chosen instant the rotation is stopped and the parts are allowed to cool under the axial force.
The advantages of the process are economy in energy, adaptability to automation, speed of operation and the quality of the weld. The disadvantages are limitations in the shape of the parts being joined, due to a need for a circular or annular interface and for a degree of symmetry in the flow of heat from the two sides of the interface. The diameters of parts currently friction-welded range from 3.5 to zoo mm. The process can be used widely when two similar metals are to be joined, but less widely for dissimilar metals: steel-copper welds require preheating of one part; welds of aluminum to steel and to copper are unsatisfactory.
The book also reviews theories of contact, friction and seizure, and discusses the temperature dependence of the friction forces. The practical procedures for selecting the rotational speed, axial force and duration of the welding cycle are outlined. The final chapters describe a number of practical friction-welding machines and list problems requiring further study.
For translation see abstracts, Wear, 4 (1961) 173. F.W.S.
Wear, 4 (1961) 33’
Lager- und Schmiertechnih insbesondere van Vwbrennungsmotoren (Bearing and lubrication tech- nology with special reference to i.c. motors) by REINHOLD KAMPS, with contributions on rolling bearing technology by HANS PERRET, VDI-Verlag GMBH, Diisseldorf, 1957; 8 chapters, 364 pp. 308 figs., 70 tables, zag refs.; 24 x 7 cm; D.M. 38.--.
This is a fascinating book written by experienced engineers of the famous Daimler-Benz A.G., Stuttgart.
It is a “how we do it” story, in essence told to a young engineer entering the works. It is assumed that the reader has had a sound education in engineering and can absorb and adapt from this book the specialized knowledge necessary for the design of modern bearings.
Half of the monograph is dedicated to information on sliding and rolling bearings ; both materials and constructions are thoroughly reviewed with emphasis on the choice of materials.
Then follows a valuable, more specialized section on bearings for i.c. engines, while the last part of the book, touching on other bearing and friction problems, is rather too short to be of real help to the novice.
There are numerous references to practical experience from the D.-B. works and tables of hitherto unpublished data. Otherwise the treatment of materials and lubricants is based essentially on work of the British and American school, while the discussion of constructions refers more to original German work.
The contributions by PERRET should be of interest to a wider circle of readers than is suggested by the title of the book.
All interested in this field and with a sufficient command of German will find this low-priced monograph not only a richly illustrated collection of facts, but also a source of inspiration.
G.Sa.
Wear, 4 (1961) 331
On Fractures Caused by Explosions and Impacts. JOHN S. RINEHART. Quarterly of the Colorado School of Mines, Vol. 55, No. 4, Colorado School of Mines, Golden, Colorado, October 1960; 155 pp., g3 figs., 8 tables, 7 refs., $z.oo.
Professor Rinehart has recently summarized his findings on “The role of stress waves in the com- minution of brittle, rocklike materials” in a contribution to an international Symposium “Stress
Wear, 4 (1961) 331-33s
