People who do not understand high-precision mirror spark machines think that processing is very difficult to operate, and the ancients often said that "if you want to do a good job, you must first sharpen your tools." "Let's learn the following points that high-precision mirror spark machining must master, understand these processing points, and use high-precision mirror spark machining to process with Lei Xiaomei, you will definitely feel SO easy."
Correct positioning: A. Determine the processing coordinate system and set the processing starting point. B. Determine other auxiliary coordinate systems, such as: standard spherical coordinate system, measurement coordinate system.
According to the size, shape and actual needs of the electrode, determine the amount of unilateral scaling and shaking method.
Determine the maximum machining parameters based on the amount of scaling.
Determine the minimum machining parameters according to the roughness requirements.
According to the principle of IP halving or medium finishing, the IP is decremented by 4-3-2-1 to select each intermediate processing stop.
Comprehensively consider the processing speed, loss and roughness of each gear, and select the best parameters; Loss is prioritized for roughing and speed for medium finishing
Calculate the Z-axis feed and machining allowance according to the machining gap and roughness of each stop, and memorize the following formula: STEP average machining allowance = Z machining allowance * 0.8, actual STEP average = unilateral scaling amount - STEP machining allowance, actual Z machining depth = Z required depth - Z machining allowance.
Memorize the meaning of the following common codes: G00, G01, G02, G03, G24, G54~G959, G80, G83, G85, G90, G91, G92, M02, M04, M05, M98, M99, T85.
Factors to be considered before selecting processing conditions: A. Pay attention to the processing speed, surface roughness, electrode loss ratio, processing allowance these four processing characteristics. B. Note the difference between the surface roughness Rmax indication value after EDM and visual inspection. C. Pay attention to the difference between the electrode loss ratio and the loss value (the processing condition table is the end face loss value). D. When the surface roughness is doubled, the processing speed will drop to less than 1/5 of the original, so the processing conditions must be selected. E. The selection of final finishing conditions should meet the surface roughness required by the drawings.
High-precision mirror spark machine in the premise of ensuring processing accuracy, but also greatly improve the coarse, finishing efficiency, in our usual use of high-precision mirror spark machining, processing requirements are usually diversified, specific problems need to be treated specifically, through practice we can continue to accumulate processing experience, can better enable us to master the law of high-precision mirror spark machining.
