The latest development of automotive plastic molds is t […]
The latest development of automotive plastic molds is the direct connection between an external computer and a CNC machine tool through the RS-232C serial port, which can directly transmit NC programs quickly and accurately, and the external computer can be connected to multiple CNCs with the same or different control systems. The machine tools are connected to share information, and can manage the information in the production process in the numerical control section composed of multiple machine tools, so as to reduce the production preparation, especially the preparation time of the numerical control NC program.
Most of the existing CAD/CAM software for high-speed machining of molds has the remaining machining allowance analysis function, and can adopt a reasonable semi-finishing machining strategy according to the size and distribution of the remaining machining allowance.
When the box mould is processing the mold core, try to cut from the outside of the workpiece and then cut into the workpiece horizontally. When the tool cuts in and cuts out the workpiece, the inclined (or circular arc) cut in and out should be used as much as possible to avoid vertical cut in and out.
Climb cutting can reduce cutting heat, reduce tool stress and work hardening, and improve machining quality.
The main goal of semi-finishing mold semi-finishing is to make the contour of the workpiece flat and the surface finish machining allowance is uniform. This is especially important for tool steel molds, because it will affect the change of the cutting layer area of the tool and the change of the tool load during finishing. , Thereby affecting the stability of the cutting process and the quality of the finished surface.
The plastic mold optimization process includes: calculation of the contour after rough machining, calculation of the maximum remaining machining allowance, determination of the maximum allowable machining allowance, and partitioning of the surface with the remaining machining allowance greater than the maximum allowable machining allowance (such as grooves and corners) Equal transition radius is smaller than the area of roughing tool radius) and calculation of tool center path during semi-finishing.
Rough machining is based on the volume model, and finishing is based on the surface model.
The previously developed CAD/CAM system has discontinuous description of the geometry of the part. Since there is no intermediate information describing the machining model after rough machining and before finishing, the remaining machining allowance distribution and the maximum remaining machining allowance of the rough machining surface All are unknown. Therefore, the semi-finishing strategy should be optimized to ensure that the surface of the workpiece after semi-finishing has a uniform remaining machining allowance.