How machining automotive parts mould

2019-12-13

The latest development of automotive plastic molds is a direct connection between an external computer and a CNC machine through an RS-232C serial port, which enables fast and accurate transmission of NC programs, and the external computer can be used with multiple CNCs with the same or different control systems. The machine tools are connected for information sharing, and can manage the information in the production process in the CNC section composed of multiple machine tools to reduce production preparation, especially the preparation time of the CNC NC program.

Most of the existing high-speed machining CAD / CAM software has the analysis function of remaining machining allowance, and can adopt a reasonable semi-finish machining strategy according to the size and distribution of the remaining machining allowance.

When processing the automotive mold core, try to cut the knife from the outside of the workpiece and then cut it into the workpiece horizontally. When cutting in and out of the workpiece, the tool should use inclined (or arc) cutting in and out as much as possible to avoid vertical cutting in and out.

Climbcutting can reduce cutting heat, reduce tool stress and work hardening, and improve processing quality.

The main goal of semi-finishing automotive mold is to make the contour of the workpiece flat and the surface finishing allowance uniform. This is especially important for tool steel molds, because it will affect the change of the cutting area of the tool and the change of the tool load during finishing. , Which affects the stability of the cutting process and the quality of the finished surface.

The optimization process of plastic automotive molds includes: the calculation of the contour after rough machining, the calculation of the maximum remaining machining allowance, the determination of the maximum allowable machining allowance, and the partitioning of the profile (such as grooves, corners) of the remaining machining allowance greater than the maximum allowable machining allowance. Areas where the transition radius is smaller than the radius of the roughing tool) and the calculation of the tool center trajectory during semi-finishing.

Upsetting is based on volume model, while finishing is based on surface model.

The previously developed CAD / CAM system's geometric description of the parts is discontinuous. Because there is no intermediate information describing the machining model after roughing and before finishing, the remaining machining allowance distribution and the maximum remaining machining allowance on the rough machining surface Both are unknown. Therefore, the semi-finishing strategy should be optimized to ensure that the workpiece surface has a uniform remaining machining allowance after semi-finishing.

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