Research On Forming Grinding Technology Of Special Spiral Surface Tool

With the development of modern industrial manufacturing,which has made progress towards high efficiency, low cost, low energy direction, people put forward higher requirements for the quality and performance of NC tool. Extrusion Taps has been widely used in automotive, aerospace, electronic communication products, manufacturing and other industries as internal thread processing model of tool and the ball head high performance milling cutter. At present,some enterprise in our country have the capacity of producing ball head milling cutters and high performance extrusion cutters, but most processing equipment and software are imported from abroad, the core technology is not open to the public, which has seriously hindered the innovation and development of China’s high performance CNC tool grinding forming technology. Although we have been engaged in the research, manufacturing and marketing of High Performance NC cutter for decades, a big gap between the foreign advanced grinding technology and domestic technology still exists.Therefore, in this paper, according to the motion characteristics of thread tool grinder and MKW6025five axis CNC tool grinder, I respectively study the extrusion tap and CNC grinding of Ball-end cutter forming technology by using differential geometry, coordinate transformation and numerical analysis theory.The paper mainly includes the following contents:1. The function, structure of SK722thread tool grinder and MKW6025five axis CNC tool grinder and motion mode are introduced, spiral surface grinding forming principle is analyzed,the mathematical model of rotary section and the contact condition of the tool (wheel)and the workpiece are derived and the interference phenomenon in the process of grinding profile is discussed.2. The extrusion Taps and ball end cutter structure are analyzed,the squeeze tap end section, the ball head milling cutter edge curve and the spiral groove and the front and back cutting edge surface model are established. The structure parameters and the contact and impact on the performance of cutting tools are studied. 3. Based on the structure characteristics of the forming principle and the existing grinding tool grinding machines, the processing technology, mathematical model of the processing path are determined. According to the machine tool control system language standard, automatic generation of software system for NC processing code is composed by using Visual C++programming language.4. A virtual machining platform is build and the simulation of grinding process taps and ball end cutter extrusion are done respectively by using NCSIMUL NC machining simulation software. The correctness of the mathematical model and software system are verified, and both analysis about the NC grinding results from the macro and micro and optimization of cutting tool structure parameters are finished, which provides the reference for the selection of the actual production process parameters in machining.