A processing method for milling free-form surface with ball-end cutter

A processing method and surface processing technology, which can be used in general control systems, instruments, computer control, etc., and can solve problems such as global optimization of cutting width.

Active Publication Date: 2017-03-15
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0005] Aiming at the problem that the global optimization of the cutting width cannot be performed in the milling process of the current complex curved surface with a ball-end cutter, the present invention proposes a processing method for milling a free-form surface by using a ball-end cutter

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  • A processing method for milling free-form surface with ball-end cutter
  • A processing method for milling free-form surface with ball-end cutter
  • A processing method for milling free-form surface with ball-end cutter

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Embodiment Construction

[0042] The following is a detailed description of the technical solution of the present invention in conjunction with the accompanying drawings.

[0043] like Figure 1-8 shown.

[0044] A processing method for milling a free-form surface with a ball-end cutter, such as figure 1 As shown, it mainly includes the following implementation steps:

[0045] Step 1: Mesh the surface to obtain the list of grids contained in the surface and the grid points contained in each grid;

[0046] Step 2: Calculate the cut width tensor coefficient matrix at each grid point, and construct the cut width tensor field;

[0047] Step 3: Search for the degenerate points contained in the cut width tensor field, and extract the three-point degenerate points;

[0048] Step 4: Search for the internal boundary points of the surface with the three-point degenerate point as the starting point, construct the internal boundary of the surface, and obtain the processing characteristics of the surface.

[...

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Abstract

The invention discloses a manufacturing method for milling a free-end surface by utilizing a ball-end cutter and belongs to the technical field of CAD (computer-aided design) / CAM (computer-aided manufacturing). The method includes: measuring cutting width of the position of any cutting contact points on a curved surface in a tensor mode; structuring a second-order tensor field of the cutting width; extracting three-point degradation points in the tensor field and searching internal boundary points of the curved surface by taking the three-point degradation points as a starting point to divide manufacturing areas of the curved surface, wherein each area is defined to be one curved-surface manufacturing feature. Multiple curves are structured in each curved-surface manufacturing feature, so that tangent direction of each point on the curves is ensured to be superposed with the largest feeding direction of cutting width of the point, the curve with the largest average cutting width is selected to be an initial machining line in the area, and tool paths of the curves are calculated by adopting an offset initial machining line to acquire machining paths of the whole curves. By the manufacturing method, the generated tool paths can be ensured to conform to the regional distribution rule corresponding to the feeding direction of the largest cutting width in the scope of the curved surface, length of the tool paths is reduced, and machining efficiency is improved.

Description

technical field [0001] The invention relates to a CAD / CAM technology, in particular to a processing method for a free-form surface, in particular to a processing method for milling a free-form surface by using a ball-end cutter. Background technique [0002] With the continuous improvement of the aerodynamic performance requirements of products, a large number of complex free-form surfaces appear in the parts of aerospace, automobile and ship products. Due to the complexity of geometric properties, most complex free-form surfaces are processed by ball nose cutter milling. It has strong applicability to curved surface shapes, and is suitable for three-axis and multi-axis machine tool processing, but the processing efficiency of ball-end cutter milling is low. The time is usually more than 100 hours. [0003] Cutting width optimization is one of the important ways to optimize the machining efficiency of curved surfaces. A larger cutting width can reduce the length of the curv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/4097
Inventor 李迎光李振瀚刘旭李强马斯博
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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