matrix by forming an etching layer over the matrix surfaces and then forming the diamond coating layer over the matrix surfaces via the etching layer by a low pressure vapor-phase synthesization method. If required, the matrix may further contain COI-CO8 (ISO) free carbon. 4731514 METHOD FOR PREDICTING BREAKING OF WIRE ELECTRODE IN WIRE ELECTRODE TYPE ELECTRIC DISCHARGE MACHINING OPERATION Mohr Naotake, Nagao Saito, Tenpaku ku, Nagoya shi, Aichi, Japan assigned to Mohri Naotak; Mitsubishi Denki Kabushiki Kais In a wire electrode discharge machining method the breaking of the wire electrode is positively detected by detecting a discharge signal between the wire electrode and the workpiece over a predetermined unit period of time, and then monitoring the average value of high frequency components included in the spectrum of the discharge signal which are independent of the vibration of the wire electrode. When the average value of the high frequency components is found to exceed a predetermined level, countermeasures are taken to avoid the breaking of the wire electrode. 4731856 AUTOMATIC ASSEMBLY APPARATUS Philip R Lloyd, Barry M Jones, Pete Saraga, David R Humphreys, Clive Newcomb, South NuhZield, United Kingdom assigned to U S Philips Corporation In automatic assembly apparatus operating under electronic vision control, features on components to be assembled must be recognized and located in position and orientation so that a gripper mechanism may be directed to one component to pick it up and move it into correct position and orientation relative to the other
component for assembly. The invention provides a known parallel projection optical system 8, 9, at the location of each component which provides a plan view for an electronic camera 11 of the components 20, 22 at constant scale regardless of lateral or axial component movements. The grey-level picture of each component provided by the camera is thresholded into a binarized picture at a threshold level which selects a primary component feature 27 within a part of the camera field of view which is certain to contain this feature. From the known location of secondary features 25, 26 and 38, 39, 40 of the component relative to the primary feature, successively limited search areas 35 and 41, 42 are set up within the camera field of view to select these secondary features when thresholded at levels related to the primary threshold. Sufficient features are thereby located in the camera field of view to provide position and orientation information on the component to a computer which directs the gripper 15 to assemble the components. 4734237 PROCESS FOR INJECTION MOLDING CERAMIC COMPOSITION EMPLOYING AN AGAROID GELL-FORMING MATERIAL TO ADD GREEN STRENGTH TO A PREFORM Anthony J Fanelli, Robert D Silvers assigned to Allied Corporation A process for shaping parts from metallic and/or ceramic powders is disclosed. The process comprises the steps of forming a mixture comprising metal and/or ceramic powders, a gel-forming material having a gel strength, measured at a temperature between 0 degrees C. and about 22 degrees C. and a gel consisting essentially of about 4 wt. % of the gel-forming material and water, of at least about 100 g/cm2, and a gelforming material solvent, and molding the mixture at a temperature sufficient to produce a selfsupporting article comprising the powder and a gel. The preferred gel-forming material is an agaroid and the preferred molding process is injection molding.
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