Research Of Grinding Tool Of Single-layer Electroplated CBN And Optimization Design For Its Structure

The emergence and applications of CBN abrasive have triggered a great abrasive industry revolution in the 20th century, The abrasive made of CBN have widely applied in all areas of grinding. Deep narrow high-precision machining process has always been a problem, Therefore research and development of new single-layer plating CBN abrasive will be the strong support for the traditional mechanical finishing process.For many high precision of narrow deep socket machining in the parts made of difficult-to-machine materials from the aerospace, automotive, hydraulic pumps and other high-precision parts, especially the narrow deep socket with width more than 2 mm, High precision narrow and deep socket can be machined with traditional bond or sintering .But when machining the socket with width less than 2mm with traditional process, The abrasive easily sheds ,Which lead to the wheel's short expectancy and low precision. To guarantee the precision, The abrasive must be dressed during the machining; But the abrasive are easily broken during the machining and dressing because the thickness of the machining part is very thin. Moreover the costs are usually high. Therefore the development of new abrasive (abrasive plated with CBN) is urgent. Compared with the traditional abrasives, abrasives plated with single-layer CBN have many advantages in production process, working accuracy and life. In recent years, electroplating CBN abrasive related research has been made a great deal of progress, but in thin electroplating CBN Grinding Wheel Technology is also in the development stage, the successful production of high-precision thin electroplating CBN grinding wheels' life is low and production costs are too high. Based on the theory and electroplating Deep narrow grinding characteristics, the thin electroplating CBN grinding wheel matrix design, manufacture and electroplating process has been analyzed, and simple grinding plating experiments and tests have been done.Currently the main problems of thin electroplating CBN grinding wheel are poor contour and uniformity. Debris from the impact of reasons of contour and uniformity, This article draws a comparison of craft characteristic of falling sand and burying sand, and proposes the new technology methods, That is the combination of suspending sand and burying sand. then this article design sets at the granulating substance plan, and proposes that nickel plating, granulating substance and thicker plating are separately done, substance is granulated at the wheel matrix, the whole process are completed in six regions, and substance is granulated on both sides and three circumferential surfaces of each region at the same time., Clamp is designed according to granulating substance design and manufacturing requirements, Which fundamentally solves the CBN abrasive contours and the distribution of uniform issues. Base on the theory of electroplating, technical analysis, and the mastered experience, electroplating experiments have been done.High grinding temperature, and wheel deforming easily are key issues of grinding narrow and deep socket, This article from the improvement radiation condition and the grinding surface's cooling performance, favors the reduced grinding wheel internal stress and the correction substrate distortion embarks Specially design clamp of the wheel, and optimizes the wheel and the overall structure. Considering the link speed is great when grinding, the wheel is easy to have the vibration. Therefore, the transient equilibrium and the static balance balancing has been made by experiment as well as the application of finite element method calculates grinding wheel's natural frequency, which has avoided the resonance region, reduced in the abrasive machining process vibration.To confirm grinding wheel's grinding performance and the use reliability, this article designs the orthogonal experiment to carry on the abrasive machining, first misses extremely are used to obtain grinding amount used (link speed, to feed quantity, grinding depth) influence. Then the superior grinding amount is obtained by the roughness relations' direct-viewing chart of grinding speed, feed quantity, grinding depth. Considering the processing efficiency, the misses extremely result is further confirmed by single factor experiment most superior combination which is the grinding amount used v=37.5m/s, ap=4mm/min, h=15mm, processing surface roughness value =0.046 is obtained. Moreover, the experiment also confirms that the thin CBN grinding wheel can machine the socket with width approximately 1.85mm and depth 15mm when grinding high-speed steel at high cutting velocity and slow feed grinding. This table has also proven that this craft of the suspending—burying sand can satisfy the processing technological requirement, therefore, the suspending—burying sand craft is feasible.