Quench hardening steel free curved surface test piece and milling process

Abstract

The invention discloses quench hardening steel free curved surface test piece and a milling process, designs the quench hardening steel test piece at the upper surface of a free curvature according tothe NURBS curve and provides a machining cutter path planning method of a free curved surface. The UG fixed-axis profile milling is adopted, and intrinsic geometric features of the curved surface ofa workpiece are described, so that a milling path planning method coupled by three driving manners composed of regular curve driving, adaptive sampling point cloud driving and benchmark surface projection curve driving described by intrinsic geometric features is put forward. Since the curvature of complex quench hardening steel profile surface is variable, machining compensation for profile surfaces of different curvatures cannot be directly carried out at a manufacturing site, the position error fluctuation of a machining surface of the curved surface is large, the accuracy of profile surface size is reduced, thus failing to meet machining quality requirement of the quench hardening steel profile surface. According to the method, the above problem can be solved, and meanwhile, the service life of the cutter as well as the machining precision and efficiency can be ensured.

Description

technical field [0001] The patent of the invention relates to the high-speed milling process and machining accuracy of hardened steel molds, in particular to the surface position error of free-form surface milling of hardened steel molds for automobiles, and belongs to the technical field of complex profile processing. Background technique [0002] With the development of the automobile industry, the update speed of models is accelerated to adapt to people's pursuit of new and unique shapes; molds for door and other covering parts that use stamping also need more complex shapes, which puts forward higher requirements for mold processing; for Large and complex surface molds have variable surface characteristics. Due to changes in curvature, the cutting space posture of the tool and the fluctuation of the cutting load of the tool are aggravated, which in turn causes the vibration characteristics of the tool to change, and the contact relationship between the tool and the worker...

AI Technical Summary

Problems solved by technology

[0004] In the present invention, an equivalent hardened steel mold test piece is firstly designed to effectively reflect the variable curvature characteristics of the hardened steel mold, and then the milling performance test is carried out on the test piece to reveal the distribution law of the surface position error, and finally the hardened steel mold is obtained. Compensation method for free-form surface milling of steel molds; it solves the problem that the curvature of complex hardened steel profiles is variable, and it is impossible to directly process and compensate different curvature profiles at the manufacturing site, resulting in large fluctuations in the position error of the curved surface processing surface and a decrease in the accuracy of the profile dimensions. The problem of meeting the quality requirements of hardened steel surface processing

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