Multi-Axis NC Turntable Layout for Large Blisk Machining
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Solution Overview
Problem
Traditional five-axis machining centers with horizontal workbenches face challenges in machining blisk parts with large diameters due to increased position compensation values for linear shafts, affecting efficiency and surface quality. Additionally, the horizontal turntable structure requires higher power and larger machine tool sizes, increasing costs.
Innovation Solution
A multi-degree-of-freedom numerical control turntable is designed with a B-shaft rotating assembly, C1-shaft workbench swing assembly, C2-shaft workbench rotating assembly, and S-shaft workbench movement assembly. This configuration allows for joint control of four shaft systems, positioning the cutting edge point close to the five-axis controlling shaft, reducing linear shaft compensation, and enhancing machining efficiency and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a horizontal workbench configuration is used in traditional five-axis machining centers, then the structure is simple and easy to manufacture, but the cutting edge point position becomes too far from the controlling shaft system when machining large diameter blisk parts, causing increased linear shaft position compensation values and reduced machining efficiency and surface quality
Solution Approach 1:
The patent applies dynamics by making the workbench configuration adjustable between horizontal and vertical positions through the swing arm mechanism. This allows the system to dynamically change its configuration based on the specific machining requirements, optimizing the position of the cutting edge relative to the controlling shaft system for different workpiece sizes and types.
Solution Approach 2:
The patent changes the spatial parameter of the workbench configuration from fixed horizontal to adjustable vertical through the swing arm mechanism. This parameter change allows the cutting edge point to be positioned closer to the controlling shaft system, reducing linear shaft compensation requirements and improving both machining accuracy and efficiency.
2Area of stationary object
If a horizontal turntable structure is used for machining large diameter blisk parts, then the workbench can accommodate large workpieces, but the swing arm must be placed horizontally which requires higher power for the rotating shaft, causing larger structure size, larger machine tool model, larger turntable interference space, and higher product cost
Solution Approach 1:
The patent uses dynamics by enabling the swing arm to switch between horizontal and vertical configurations. When machining large diameter parts, the workbench can be positioned vertically, which reduces the power requirements for the swing arm rotating shaft compared to maintaining a horizontal configuration, thereby reducing overall power consumption and structural size.
Solution Approach 2:
The patent applies dimensionality change by utilizing the vertical dimension through the swing arm mechanism. Instead of only horizontal workbench configuration, the system can extend into the vertical dimension, allowing large workpieces to be machined with reduced power requirements and smaller structural footprint.
3Volume of moving object
If a horizontal workbench configuration is used, then the structure is compact, but the turntable interference space increases and overall product cost increases due to higher power requirements
Solution Approach 1:
The patent applies dynamics by making the workbench configuration adjustable between horizontal and vertical positions. This dynamic capability allows the system to optimize its footprint and reduce turntable interference space by utilizing vertical clearance, thereby maintaining a more compact overall machine tool size while reducing structural complexity.
Data Source
AI summary
The present invention discloses a multi-degree-of-freedom numerical control turntable including: a B-shaft rotating assembly; a C1-shaft workbench swing assembly; a C2-shaft workbench rotating assembly; and an S-shaft workbench movement assembly. The B-shaft rotating assembly includes a rotating connection land and a B-shaft power control mechanism; the C2-shaft workbench rotating assembly includes a movement base, a workbench and a C2-shaft power control mechanism; the S-shaft workbench movement assembly includes a swing base and an S-shaft power control mechanism; and the C1-shaft workbench swing assembly includes a swing arm and a C1-shaft power control mechanism, with the C1-shaft line intersecting the B-shaft line. The S-shaft power control mechanism can drive the movement base to move along an S-shaft line on the swing base to cause a region to be machined of a workpiece to approach the intersection point of the C1-shaft line and the B-shaft line. The present invention adds the C1-shaft and S-shaft, so that when the cutting edge point participates in the motion, the coordinate change of the linear shaft is smaller, the compensation range of the linear shaft is smaller, the machining efficiency is higher, and the surface quality and machining accuracy are less affected by the accuracy of the linear shaft.