Machining of hole parts Most of the hole machining of the parts adopts a multi-blade composite type (blade machine clamp, insert welding combination) structure, and the grinding is replaced by reaming and squeezing. In the process of one-time walking, the hole finishing is completed, the rotation speed reaches 3000r/min, the cutting speed is 1.5~3m/min, the precision is 5~7, the roughness Ra=0.7μm, the gun drilling speed reaches 8000r/ Min, Ra = 2 μm. The precision boring and reamer produced by Mapal in Germany is widely used in the automotive industry due to its unique structure, ultra-precise internal hole precision, excellent surface roughness and high economic efficiency. The Mapal tool is a single-edged cutting tool with a precision ground indexable insert. Two or more supporting guide bars are arranged on the cutter body, and the support guide bars also support the corresponding positions at the same time as the blades enter the workpiece cutting, and absorb the vibration and resistance caused by the cutting, and ensure the inside. The roundness and cylindricity of the hole are within 1 to 3 μm, and the hole diameter tolerance is H6. In the processing of valve tunnel holes in automobile engines, the machining accuracy and surface quality are superior to gun drilling. The cylinder hole boring adopts double-station, machine tool spindle built-in and axial reciprocating push-pull rod mechanism. The reciprocating passes are used for rough and fine boring, respectively, and the boring speed is up to 800 m/min. Processing of flat parts Most of the milling of plane parts adopts the diameter and axial bidirectional adjustable high-speed close-tooth face milling cutter with dense teeth, over-position and repeated clamping structure. The milling cutter has a diameter of 250 to 400 mm and an axial runout of ≤ ± 0.0025 mm. The machining of the part assembly plane is milled, with roughness Ra=0.7μm and unevenness <0.02mm. The insert of the fine milling cutter can be adjusted with an eccentric screw with an adjustment accuracy of 0.002 mm. In the medium feed finishing milling process, the normal blade and the smoothing blade are arranged reasonably, and the surface roughness of the parts can be obviously improved; when the large feed finishing is finished, all the polishing blades are used to obtain the ideal surface roughness. When milling aluminum alloy workpieces, various sizes of milling cutters with different pitches and large axial and radial rake angles are used. The rake face of the tool is polished, and the cutting force is small during cutting without vibration. Good quality. For the machining of the main bearing cap of the crankshaft, the special tool for broaching of the inverted and arranging machine clamps is used for the razor-type, and 713 pieces of indexable carbide coating (TiCN) blades are installed. The feed rate is 25m/min. 1750 pieces, the cutting allowance of broaching is 1.5~3mm. In the processing of connecting rods of automobiles, the separation surface breaking process and the double-sided horizontal double-axis circular table surface grinding process are all high-quality and high-efficiency processing techniques commonly used in foreign connecting rod production. Machining of shaft parts The machining of the crankshaft main journal and the connecting rod journal of the automobile is a double-station car-specific tool for broaching. The cutter head has a diameter of 700mm, and the cutter disc is equipped with 40 pieces of carbide coated blades. Each 10 pieces is 1 set, the cutting speed is 150m/min, the fast forward speed is 4.6m/min, and the radial cutting allowance is 1.5. ~3mm. In addition, some parts of the shaft end of the outer cylindrical surface processing using the forming combination of external milling, reaming special tools, one pass to complete the outer circle and end face roughing, instead of single-blade turning process. ? Gear processing Cylindrical gear machining Most of the foreign countries use a multi-coated high-speed hob (cutting speed of 110m / min or more) and radial shaving knife roll, shaving, to shave grinding. A large number of CNC cutting equipment is used to greatly improve the processing efficiency, and the machining accuracy can be stabilized at level 7 or above. Hard tooth surface cutting with hard alloy tools has become an important research field. High-speed hobbing of more than 100m/min in China is applied in some joint ventures. Dental caries, grinding teeth, and radial shaving also have different degrees of application, but most of them are poor in processing efficiency, precision and stability, and generally only achieve 8 levels of precision. 2. Straight bevel gear processing A large number of foreign countries use precision forging technology to retain the cutting technology in the occasions with high precision requirements. At present, the domestic precision forging process has been applied, but it is rarely used in automobile production, and most of them still adopt the cutting technology. 3. Spiral bevel gear processing Most of the spiral bevel gears in foreign countries use CNC milling machine to cut teeth. After heat treatment, they use CNC grinding machine to grind teeth. Paired fine assembly or CNC milling machine. After heat treatment, the machine is ground by CNC gear grinding machine to better correct heat treatment deformation. Can be paired with the assembly. Hardened surface scraping technology has certain applications in spiral bevel gear machining. Both Gleason and Oerlikon have introduced the latest design, analysis and measurement software for six-axis CNC equipment, making the spiral bevel gear design, machining, and tooth profile correction an intelligent closed-loop system. The gear measurement center is used for advanced measurement and automatic detection, which makes the measurement accurate, high precision and high efficiency. The spline tooth shape processing on several transmission shafts of the engine adopts double-station, paired configuration, squeezing and special tools for chipless machining, and reciprocating motion, and the spline tooth shape is extruded. Most of the domestic spiral bevel gears are processed by ordinary milling machines, and the teeth are machined after heat treatment. The cutting precision is low, and the real function of the grinding tooth is not exerted. The heat treatment deformation of the material has poor controllability. The CNC gear grinding machines of Gleason and Oerlikon, which were just introduced by FAW Group and Dongfeng Motor Co., have not been used for production. Gear inspection generally uses a weekly inspection instrument, an involute inspection instrument, a base gauge, etc., and a few manufacturers use a gear inspection center. Contour Brush,Eyeshadow Brush,Makeup Brush Liya Beauty Accessories Co., Ltd. , http://www.chinapowderpuff.com Previous page 1 2 Next page