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CAM与自动编程 封志明 18682697865@163.com.

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Presentation on theme: "CAM与自动编程 封志明 18682697865@163.com."— Presentation transcript:

1 CAM与自动编程 封志明

2 VIII、 Fixed-Axis Surface Contouring
--Chapter VIII-- Fixed-Axis Milling Overview How to Create Planar Milling Operation Fixed-Axis Milling Geometry Fixed-Axis Milling Drive Method Mechanical University

3 To be able to Create Fixed-axis contour Milling.
Chapter VIII To understand the Fixed-axis milling. To understand the Drive Methods of Fixed-axis Surface Contouring. Objectives To be able to Create Fixed-axis contour Milling.

4 8.1 Surface Contouring Overview
8.1.1 Surface Contouring Introduction Fixed-axis Surface Contouring operations and Variable-axis Surface Contouring operations finish areas on contoured surfaces by removing material along the part contours. You can control the Tool Axis and Projection Vector options to create tool paths that follow the contours of very complex surfaces. Surface Contouring For Fixed-axis Surface Contouring operations , the tool axis remains parallel to a specified vector. For Variable-axis Surface Contouring operations, the tool axis constantly changes orientation as it moves along the tool path.

5 8.1 Surface Contouring Overview
8.1.1 Surface Contouring Introduction To create a Surface Contouring operation, you should specify: Part Geometry (optional) 1 Drive Geometry 2 Projection Vector (required if Part Geometry is specified) 3 Tool Axis 4

6 8.1 Surface Contouring Overview
8.1.1 Surface Contouring Introduction Drive Geometry can include part geometry or geometry that is not associated with the part. The software creates drive points from the specified Drive Geometry to control the tool position. When Part Geometry is not specified, the software positions the tool directly on the drive points. When Part Geometry is specified, the software positions the tool where the drive points project onto the Part Geometry. The selected Drive Method determines how you define the drive points required to create a tool path.

7 8.1 Surface Contouring Overview
8.1.1 Surface Contouring Introduction The selected Drive Method determines how you define the drive points required to create a tool path. Some Drive Methods create a string of drive points along a curve while others create an array of drive points within an area. The Projection Vector defines how the drive points project to the Part Surface, and which side of the Part Surface the tool contacts. The selected Drive Method determines which Projection Vectors are available.

8 1. Fixed-Axis Milling Overview 8.1 Surface Contouring Overview
8.1.1 Surface Contouring Introduction Mill Fixed Axis Variable Axis Planar Mill Contour Mill Surface Contour Sequential Mill Cavity Mill

9 1. Fixed-Axis Milling Overview 8.1 Surface Contouring Overview
8.1.2 Fixed-axis Surface Contouring Operation Subtypes

10 1. Fixed-Axis Milling Overview 8.1 Surface Contouring Overview
Suitable Occasion Drive Geometry Tool axis remains parallel to a specified vector. Define the drive Points required to create a tool path Complex surfaces finishing

11 1. Fixed-Axis Milling Overview
8.2 Valid geometry for Fixed-axis Surface Contouring Geometry Tab.8-2 Valid geometry for Fixed-axis Surface Contouring

12 1. Fixed-Axis Milling Overview
8.2 Valid geometry for Fixed-axis Surface Contouring Geometry The specified part geometry works in combination with the drive geometry (usually a boundary) to define the cut region. You may specify Bodies (sheet or solid), Faceted Bodies, Surface Region features, or Faces as Part Geometry.

13 1. Fixed-Axis Milling Overview
8.3 Drive Methods Drive Method Drive methods define the Drive Points required to create a tool path. It allow you to create a string of Drive Points along a curve or an array of Drive Points within a boundary.

14 4. Fixed-Axis Milling Drive Method
8.3 Drive Methods 10 Methods Method Definition 1 Curve/Point Defines Drive geometry by specifying points and selecting curves 2 Spiral Defines Drive Points that spiral outward from a specified center point 3 Boundary Defines cut regions by specifying Boundaries and Loops 4 Area Milling Defines cut regions by specifying Cut Area geometry. Drive geometry isn't required. 5 Surface Area Defines an array of Drive Points that lie on a grid of Drive Surfaces

15 4. Fixed-Axis Milling Drive Method
8.3 Drive Methods 10 Methods Method Definition 6 Streamline Builds an implied drive surface from the selected geometry 7 Tool Path Defines Drive Points along the tool path of an existing CLSF to create a similar Surface Contouring tool path 8 Radial Cut Generate Drive Paths perpendicular to and along a given boundary, using a specified Stepover distance, Bandwidth and Cut Type 9 Flow Cut Generates Drive Points along concave corners and valleys formed by Part Surfaces 10 Text Select annotation and specify a depth to engrave text on the part.

16 4. Fixed-Axis Milling Drive Method
8.3 Drive Methods ① Curve/Point When specifying points, the Drive Path is created as linear segments between the specified points. When specifying curves or edges, Drive Points are generated along the selected curves and edges. The curves may be open or closed, contiguous or noncontiguous, planar or non-planar. Points for Open Path Points for Closed Path Drive geometry defined by curves

17 4. Fixed-Axis Milling Drive Method
8.3 Drive Methods ① Curve/Point Custom Cut Feed Rate add custom feed rate values to each set of curves. Cut Step Number : Controls the number of points placed on each curve or edge Tolerance : Specify the maximum allowable chordal deviation between the Drive Curve and the line extending between two consecutive Drive Points.

18 4. Fixed-Axis Milling Drive Method
8.3 Drive Methods ② Spiral The drive points are created within the plane normal to the projection vector and containing the center point. It maintains a constant cutting speed and smooth motion, so it is useful for high speed machining applications. The Center Point defines the center of the spiral and it is where the tool begins cutting. Spiral Drive Method

19 4. Fixed-Axis Milling Drive Method
8.3 Drive Methods ② Spiral Max Spiral Radius Limits the area to be machined by specifying a Maximum Radius

20 4. Fixed-Axis Milling Drive Method
8.3 Drive Methods ② Spiral Stepover Specifies the distances between successive cut passes Stepover Distance for Spiral Drive

21 4. Fixed-Axis Milling Drive Method
8.3 Drive Methods ② Spiral Cut Direction Defines the direction the Drive Path cuts in relationship to the spindle rotation Climb Cut and Conventional Cut

22 4. Fixed-Axis Milling Drive Method
8.3 Drive Methods ③ Boundary Cut regions are defined by Boundaries, Loops, or a combination of both. It works in much the same way as Planar Milling. Boundaries may be created from a sequence of curves, an existing permanent boundary, points, or a face. Boundary Drive Method

23 4. Fixed-Axis Milling Drive Method
8.3 Drive Methods ③ Boundary Tolerance Specify the inside and outside tolerance values for the boundary Offsets Specify how much material to leave along the boundary Containment Defines cut regions by creating loops along exterior edges of selected part

24 4. Fixed-Axis Milling Drive Method
8.3 Drive Methods ④ Area Milling It’s similar to the Boundary Drive Method, but requires no drive geometry. Cut Area may be defined by selecting Surface Regions, Sheet Bodies, or Faces. You may further constrain the cut regions by Steep Containment. You should use the Area Milling Drive Method in place of the Boundary Drive Method whenever possible. Boundary Drive Method

25 4. Fixed-Axis Milling Drive Method
8.3 Drive Methods ④ Area Milling Steep Containment restricts the cut area based on the steepness of the tool path Non-steep Directional Steep

26 4. Fixed-Axis Milling Drive Method
8.3 Drive Methods ④ Area Milling Stepover specifies the distances between successive cut passes The 1 indicates the scallop height, and the 2 indicates the stepover

27 4. Fixed-Axis Milling Drive Method
8.3 Drive Methods ⑦ Radial Cut The Radial Cut Drive Method enables you to generate Drive Paths perpendicular to and along a given boundary, using a specified Stepover distance, Bandwidth and Cut Type. This drive method is useful in creating cleanup operations. Radial Cut Drive Method Direction is Defined by Boundary Indicators

28 4. Fixed-Axis Milling Drive Method
8.3 Drive Methods ⑦ Radial Cut Band on Material/ Opposite Side Defines the total width of the machined area measured in the plane of the boundary. Path Direction Determines the direction the tool travels along the boundary.

29 4. Fixed-Axis Milling Drive Method
8.3 Drive Methods ⑨ Flow Cut It is used for Removing excess material in corners prior to finishing or Removing the uncut material left behind by a previous, larger ball cutter. It generates tool paths one level at a time along the concave corners and valleys formed by part surfaces. It avoids embedding the tool when it moves from one side to the other. Flow cut

30 4. Fixed-Axis Milling Drive Method
8.3 Drive Methods ⑨ Flow Cut Maximum Concavity determine which sharp corners and deep valleys will be cut Concavity Angle

31 4. Fixed-Axis Milling Drive Method
8.3 Drive Methods ⑨ Flow Cut Concavity of 179 Degrees Concavity of 160 Degrees

32 4. Fixed-Axis Milling Drive Method
8.3 Drive Methods ⑨ Flow Cut Flowcut type Single Pass Multiple Passes Reference Tool Offsets Reference Tool

33 4. Fixed-Axis Milling Drive Method
8.3 Drive Methods ⑨ Flow Cut Reference Tool Diameter specifies the width of the finishing cut region based on the diameter of the roughing ball cutter. The software calculates the bi-tangency contact points from the specified Reference Tool Diameter and then uses these points to define the cut region for the finishing operation. Reference Tool

34 4. Fixed-Axis Milling Drive Method
8.4 Drive Methods Projection Vector enables you to define how the Drive Points project to the Part Surface, and the side of the Part Surface the tool contacts. The types of Projection Vectors available depend upon the Drive Method. The Projection Vector option is common to all Drive Methods except Flow Cut. Drive Point Projects to Part Surface

35 4. Fixed-Axis Milling Drive Method
8.6 Create a Fixed Contouring operation Steps ① On the Insert toolbar, click Create Operation    , or choose Insert→Operation. ② In the Operation Subtype group, click FIXED_CONTOUR ③ In the Location group, select the following: Program PROGRAM Tool MILL Geometry WORKPIECE Method MILL_FINISH ④ Click OK, the Fixed-Contour Mill dialog box is displayed. ⑤ Select Drive Method. ⑥ Click Generate  .

36 4. Fixed-Axis Milling Drive Method
8.7 Fixed Contouring operation Example Flowcut Multiple operation Path Fixed Contouring Operation Model Area Milling Drive Method

37 THANKS 封志明/机械工程学院 2019年4月27日


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