CVD diamond thick welding tool

CVD diamond thick film soldering tool is to first cut a good CVD diamond films once welded to the base (usually a class K carbide) to form a composite sheet, and then polishing composite sheet, the  diamond blade  second welded to the tool body, sharpening into the required shape and edge.Manufacturing process: high-quality CVD diamond films prepared by laser cutting → → welded into one composite piece → polishing → secondary composite sheet welded to the tool body → Grinding → test. Here are a few key processes, such as cutting, welding, polishing and grinding, etc.A laser cuttingCVD diamond film hardness, non-conductive (conductive CVD diamond now, but itsresistivity great), strong wear resistance, conventional machining and wire cutting method is not suitable for CVD Diamond Thick cut. Efficient processing method is laser cutting.(2) a weldingA welding means under vacuum CVD diamond thick film substrate is welded to some form a composite sheet. Diamond between the metal and the general poor weldability. Currently, diamond thick welding tool used mainly surface metallization methods. Solder the silver-copper alloy containing titanium, titanium role in the welding process of heating the surface of the diamond film and the reaction to produce an intermediate layer of TiC, the diamond film surface metal, thereby improving the welding strength.Welding Class K matrix is ​​usually carbide. In the high vacuum conditions, using diffusion brazing welding process added, Ag-Cu-Ti alloy as an intermediate layer, the diamond films on cemented carbide substrate weld, weld strength to meet the machining requirements.3 Composite PolishingThe purpose is to polish the upper surface of the blade (i.e., the rake face) polished to a mirror, generally required to achieve Ra0.1μm less. After polishing tool rake face and the chip can reduce friction and adhesion, extend tool life; also can  improve the flatness and sharp blade, improve machining accuracy. Polishing a composite sheet with a special polishing machine.4 secondary weldingSecond welding refers to the composite sheet welded to the tool body. Equipment used mostly for concrete blade   high frequency induction welding equipment, the use of silver-copper solder and solder flux. Soldering temperature is between 650 ~ 700 ℃. Temperature is not too high, the welding process the welding surface should be kept clean. Rational use of flux help to improve weld strength and improving the composite sheet material substrate and knife welding performance. Generally the strength of the second weld 180 ~ 200MPa, the diamond cutting tool to meet the processing requirementsIn addition, in order to improve the appearance of the tool can be worn away excess oil stone of silver and copper, with the blasting method to remove the surface oxide layer with Ni plated with passivation liquid immersion method or tool body to prevent the oxidation of rust.CVD diamond grinding with high hardness and wear resistance, grinding extremely difficult. Now masonry blades   widely used methods similar to PCD tool sharpening.5 Equipment: using a special tool grinder, equipment manufacturers in the United Kingdom COBORN Corporation, Taiwan KARMAM, Switzerland EWAG Corporation and Beijing Dean companies. Its main features include: straight edge grinding and circular grinding, circular grinding, and also includes a cylindrical conical flank flank formation and tapered cylindrical flank with a combination. In order to achieve these functions, requiring major sports machine include: machine tool spindle (wheel) rotational motion; spindle reciprocating linear motion; turret rotary motion, with the precise alignment of the microscope or projector rotation center, get a different tip round arc radius.