1、 Processing type:
- Hole processing:
- Drilling: before drilling on the machining center, the center drill must be used for positioning, and then the drill bit 0.5 ~ 2mm smaller than the drawing size shall be used for drilling, and finally the appropriate drill bit shall be used for finishing.
- Reaming processing: when reaming the workpiece, it is also necessary to use the center drill to locate, then drill with a drill 0.5 ~ 0.3mm smaller than the drawing size, and finally ream with a reamer. When reaming, pay attention to control the spindle speed within 70 ~ 180rpm / min.
- Boring: to boring the workpiece, first use the center drill to locate, then use the drill 1 ~ 2mm smaller than the drawing size to drill, then use the rough boring cutter (or milling cutter) to process to the left side of 0.3mm machining allowance, finally use the pre adjusted size of the fine boring cutter for fine boring, and the last fine boring allowance shall not be less than 0.1mm.
- Direct numerical control (DNC) operation:
- Before DNC NC machining, the workpiece should be clamped, the zero position should be set, and the parameters should be set.
- Open the processing program to transfer data in the computer for checking, then let the computer enter DNC state, and input the file name of the correct processing program.
- Press the tape key and the program start key on the machine tool, and the machine controller will flash LSK.
- Press enter on the computer to process DNC data.
2、 Contents and scope of workers’ self inspection:
- Before processing, the processor must see clearly the contents of the process card, know clearly the parts to be processed, the shape, the dimensions of the drawing and the processing contents of the next process.
- Before the workpiece is clamped, the blank size should be measured to see if it meets the requirements of the drawing. When the workpiece is clamped, it must be carefully checked whether its placement is consistent with the programming operation instruction.
- After rough machining, self inspection should be carried out in time to adjust the data with errors in time. The main content of self inspection is the position and size of the processing part.
(1) Whether the workpiece is loose or not;
(2) . whether the workpiece is correctly divided into parts;
(3) Whether the dimension from the processing part to the datum edge (datum point) meets the drawing requirements;
(4) The position and size of processing parts. After checking the position and size, measure the rough machined shape ruler (except arc).
- Finish machining can only be carried out after rough machining and self checking. After finishing, the workers should carry out self inspection on the shape and size of the processing parts: check the basic length and width of the processing parts on the vertical plane; measure the base point size marked on the drawing for the processing parts on the inclined plane.
