Composite toward high efficiency crankshaft machining technology
590Hits2014-04-27 08:19:23 Source:iscar
Composite toward high efficiency crankshaft machining technology
The crankshaft machining technology status
Domestic old crankshaft production line consists of ordinary machine tools and special machine tools, production efficiency and relatively low degree of automation.Rough machining equipment generally USES multiple blade lathe turning crankshaft main journal and the connecting rod journal, process quality stability, easy to produce larger processing stress, to meet the reasonable machining allowance.Finishing more than the ordinary coarse grinding crankshaft grinding machine - half - fine grinding, polishing, usually by manual operation, the processing quality is not stable, size uniformity is poor.The old production line is one of the main characteristics of common equipment is too much, according to the processing and nodular cast iron crankshaft, a production line 35 ~ 40 sets of equipment.The author has explored the south a forged steel crankshaft production line, roughing USES ordinary milling spindle neck and neck, then nc car main journal and the connecting rod journal, again through multi-channel processes of grinding way to finish machining process.Production line equipment is up to more than 60 units, product flow line length, area occupies large area, production efficiency is to rely on multiple devices completely decomposition processes and room to improve.
However, today's engine crankshaft manufacturing industry is facing the following problems:
（1） Many varieties and small batch production
（2）Short delivery time.
（3）Reduce the manufacturing cost
（4）Hard cutting material machining difficulty increased significantly, the emergence of a proposed many need to solve in the processing of subjects, such as cutting
（5） To protect the environment, with or without cutting fluid, require less namely dry cutting or dry cutting.
It is based on the above new situation, in the 21st century, the efficient composite processing technology and equipment manufacturing industry has been rapidly used, production efficiency has been greatly improved, the engine crankshaft production line production equipment to reduce the number of I once saw in a car engine crankshaft production line, all only about 13 equipment, product flow line is short, high machining efficiency, easy to quality management.
The crankshaft efficient processing technology
In the mid - 1990 - s abroad and developed new type of crankshaft milling machine, CNC high-speed crankshaft rough machining process and make up a new step, in the CNC crankshaft milling and CNC high-speed crankshaft milling, milling exist within the following disadvantages: not easy to knife, the cutting speed is low (usually greater than 160 m/min) for a long time, machine tools, cutting investment is more, the process cycle time is longer than the other.And high-speed CNC crankshaft milling has the following advantages: high cutting speed (up to 350 m/min), cutting shorter, process cycle time is shorter, less cutting force, low temperature rise, high tool life and workpiece in fewer knife, higher machining accuracy, flexible is better.Therefore, CNC high-speed crankshaft milling outside will be the development direction of crankshaft rough machining.
The author south Asian automotive co., LTD in jiangsu fiat cars crankshaft production line to see German company BOEHRINGER represent two sets of processing equipment, a platform for nc crankshaft car - pull machine, another one for CNC high speed of the crankshaft milling, experience the feeling of a "very sharp".According to expert introduction, car - machine is especially suitable for myself in the crankshaft journal have heavy cutting groove, crankshaft counterweight side without processing, and high speed milling is not axial have heavy cutting groove machining crankshaft.Here is a brief introduction of VDF OM - 315 four high speed servo outside milling machine processing performance: the machine is designed for automobile engine crankshaft Germany BOEHRINGER represent companies design and manufacture of flexible CNC milling machine, the equipment used rotary workpiece and cutter feed servo control technology, the muscle can be a clamping servo tracking milling rotary center does not change the crankshaft crankshaft connecting rod journal.VDF o M - 315 four high speed servo outside milling lathe bed with integration of composite material structure, electronic synchronous rotation drive on both ends of the workpiece, dry cutting, high machining accuracy, high cutting efficiency, etc.Using SIEMENS 840 d CNC control system, equipment operating instructions on the man-machine interface, by basic parameters can be automatically generated input parts processing procedures, can be processing length 450 ~ 450 mm and 380 mm in diameter slewing within various crankshaft, connecting rod journal error of plus or minus 0.02 mm in diameter.