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High-effective Engineering Development and Technology for Planetary-type Grinding
Universally adopted standard conditions in grinding the articles made from badly machine-treated metals and alloys require that we always have to find a compromise way between maximal efficiency and reasonable quality. Research conducted by the Institute for Problem in Machinery of the National Academy of Sciences of Ukraine (IP MASH) define true kinematics conditions to be provided for grinding the metals of various machinability with high quality and efficiency. Provision of these conditions is attained by corresponding measures in kinematics for grinding. In this line, the time interval between two successive operations of cutting removal taken from the same portion of the article under work should be not less than the rated value needed for running the corresponding physicochemical processes.
On the basis of these research, new regimes and grinding methods for flat and curved articles have been designed. To test these new regimes and methods for grinding, lab prototypes have been worked out and checked as follows:
1. Profile grinding machine for group grinding of the tip profile of turbine blades.
2. Multi-seater arrangement in combination with a radial grinding machine intended for planetary grinding of small diameter cylinder articles.
3. Multi-seater arrangement in combination with a radial grinding machine intended for planetary profile grinding the cams of distribution camshafts.
4. Planetary grinding heads for surface grinding machine.
The lab tests have produced the following results: temperature load reduction of grinding is 5-10 times less; reduction of specific energy consumption for grinding is 1,5-2 times less; grinding is defect-free from fracture and sears forming; building-up of residual compression stresses is up to the depth of 35 mu
possibility of internal bottom grinding without excessive cooling application.
The purpose of the project is the development of theoretical basics of new engineering for planetary and planetary-mated grinding used in machining of surface flat and curved articles made from badly machine-treated metals and alloys. This new engineering promotes using technologies fully eliminating probability of creation of grinding defects in the form of fractures and sears.
Partial financial backing for these studies is shared from the NAS of Ukraine budgeting, JSC <<AVTRAMAT>> and PKF <<EMPO-NISAT> Ltd. An additional financial support is assumed to be requested in the framework of scientific programs being exercised by NATO, USAID and USTC.
The authors of the program on the part of Ukraine are:
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