Carbide products and processed hard grind materials. Carbide high hardness, wear resistance, super-hard materials instead of traditional silicon carbide and corundum carbide abrasive machining the workpiece to prevent the workpiece surface burns, microcracks. Metamorphic layers too deep notch or other defects, improve processing efficiency and cost-saving grinding. Superhard material hardness is much higher than ordinary abrasive grinding capacity of its composite involute broaches hopout bore hole to the workpiece, the advantages are: (1) using this technique knife workpiece spline hole, The ability to reliably ensure workpiece bore concentricity between the various shaped surfaces, which can be unified with the small-diameter circular surface of the workpiece as a positioning reference in subsequent processing steps, greatly facilitate the subsequent processing steps workpiece positioning mandrel and test mandrel production, and can reliably guarantee the position of all machining accuracy of the workpiece surface. (2) Composite involute tooth jump bore broach is a quality, economically better broach. Because this technology uses cutter knife hopout reasonable manner and spline arrangement edge open backlash teeth structure can be reliably knife manufacturing quality assurance techniques, greatly facilitate the broach manufacturing, this technique manufacturing cost of the knife almost ordinary composite involute broach the same. 2000-10000) times the normal abrasive, so various forms carbide grinding can be achieved with super-hard materials.