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Digital control CNC machining process analysis

Digital control CNC machining process analysis

Process analysis includes the following aspects:

1) Select suitable for processing on CNC machine parts to determine the content of the step.

2) Analysis of the pattern to be machined parts, specifically the processing content and technical requirements, define the machining program based on this part of the development of CNC machining process route, such as the division process, processing in the order, and the interface between the conventional machining process.

   3) design CNC machining step. As step division, part positioning and fixture selection, tool selection, cutting parameters and the determination.

4) adjustment CNC machining step program. As the knife point, tool change point selection, processing route is determined, the compensation of the tool.

5) allocation CNC machining tolerances.

6) processing on CNC machine tools part of the process instruction.

In short, the CNC machining process more content, somewhat similar to ordinary machining.

(1) the structural characteristics of the parts and materials as part of duralumin LY12, the cutting performance is good, typical of thin-walled disc-type structure, larger dimensions, the thickness of the peripheral and internal ribs only 2mm, type cavity depth of 27mm. This part in the process if the process program or process parameters set incorrectly, easily deformed, causing the size of the ultra-poor,

(2) the selection process analysis of the rough parts bar, the use of roughing, finishing technology programs, specific process is as follows: blank → roughing → aging → roughing → finishing → finishing. Rough: Reserved 1.5mm respectively in the outer finishing allowance and end, and the center of the pre-drilled holes. Roughing: respectively in the cavity and the bottom side of the reserve margin 1.5mm, and at the pre-drilled holes φ12mm technological holes. Aging: remove material and process stress. Finishing: fine car face, cylindrical holes and boring process φ6mm, requires the completion of a fixture, in order to ensure concentricity, lay the foundation for subsequent processing. Finishing: ensure that the final requirements of the parts, is focus of this paper.

① roughing cavity roughing is to remove a large margin, and lay the foundation for subsequent finishing, so when the pocket, the low cost of conventional digital control CNC milling machining. This process required by the structure shown in Fig machined parts inside shaped profile, a circular arc corner of R5mm, the finishing allowance even as 1.5mm. And this procedure also require pre-processing required in the positioning hole finishing hole φ12mm place.

② finishing pockets speed up application processing technology in recent years manufacturing technology. In the high-speed machining, since the cutting force is small, can reduce part machining distortion, more suitable for thin-walled parts, and the chip is cut in a short time, most of the heat is taken away cutting chips, thermal deformation of the workpiece small, will help to ensure the size, shape precision parts; high-speed processing can achieve high surface quality, but also greatly shorten the processing cycle, so the combination of the characteristics of such thin-walled disk parts, the choice of high-speed machining for finishing the cavity.

③ positioning hole machining the parts and finishing selection of the center hole φ6mm φ12mm hole as the positioning hole, so it must be in place before finishing the processing cavity. Φ6mm turner center hole when finishing its outer φ301.5mm boring as φ6H8; φ12mm hole by the digital control CNC drilling, milling, reaming to φ12H8.

(3) When finishing the cavity positioning and clamping of parts in order to make the workpiece on the machine can be quickly and correctly clamped and the workpiece during machining than having to find a number of positive, so this process uses two sells targeting methods . In φ6mm and φ12mm hole on the part already exists as a positioning hole, making it easy for tooling, the tooling using a cylindrical flat pin and a pin as the positioning element. Since the parts belong to thin-walled parts, easily deformed, when the workpiece is clamped, the pressure plate should be relatively rigid in the work site, distributed as evenly as possible to ensure the reliability of the clamping, and clamping force size should be appropriate, positioning of the workpiece to prevent damage or deformation of the workpiece inadmissible. The specific positioning and clamping. This clamping manner fully consistent with the characteristics of a machining center, a fixture can complete the processing of all the holes and cavities.

Dimensions accuracy: analysis pattern dimensional accuracy requirements in order to determine the possibility of using the turning process to achieve, and to determine the dimensional accuracy of the control process method.

In that analysis, it can also be converted at the same time a number of dimensions, such as incremental and absolute dimensions of size and dimension chain calculation. In the use of CNC lathe, often to the required size averaging maximum and minimum size limit as programmed dimensions.

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