Transcript Sweep - Ferdowsi University CAD CAM Lab Website!

SolidWorks Session 5
Ferdowsi University of Mashhad
Dr. Behnam Moetakef Imani
Sweep
Sweep creates a base, boss, cut, or surface by moving a
profile (section) along a path, according to these rules:
o The profile must be closed for a base or boss sweep feature;
the profile may be open or closed for a surface sweep feature.
o The path may be open or closed.
o The path may be a set of sketched curves
contained in one sketch,
a curve, or a set of model edges.
o The start point of the path must lie on
the plane of the profile.
o Neither the section, the path,nor the
resulting solid can be self-intersecting.
o The guide curve must be coincident with
the profile or with a point in the profile sketch.
Simple sweep
• to create a sweep feature a cross-section and a path are required.
• The profile is typically perpendicular to the path, although this is not a
requirement.
• The profile (cross-section) can change along the path, but the overall shape
must remain the same.
Sweep
Sweep is one of the advanced feature in SolidWorks
Sweep can create:
 a base,
boss,
cut,
or surface
by definition, moving a profile
(section) along a path,
will create a sweep feature.
controlling the size, orientation,
and position of the cross-section
as it travels through the sweep.
No trajectory controlled interpolation
trajectory controlled interpolation
Sweep
Steps of creating a simple sweep feature
o Sketch a closed, non-intersecting profile on a plane or a face.
o Create the path for the profile to follow. Use a sketch, existing model edges, or
curves.
o Swept Boss/Base or Swept Cut or Swept Surface
o Select a sketch in the graphics area for Profile
o Select a sketch in the graphics area for Path
To Create a Sweep
Sweep
Sweeps can:
• Use guide curves (more advanced)
• Be created with multiple profiles
• Be created as thin features
Introducing Guide Curve and Path
Path – vertical sketch through
ellipse
Guide curve – spline
Profile - ellipse
Path and guide curve length
•The path and the guide curves may differ in length.
•If the guide curves are longer than the path, the sweep is as long as
the path.
•If the guide curves are shorter than the path, the sweep is as long as
the shortest guide curve
Pierce constraint
Pierce relation
• It acts as if the 3D curve is a length of thread and the sketch point is
the eye of a needle where the thread pierces the needle eye.
• The Pierce relation is most important in the Sweep feature when it is
applied in the profile sketch between endpoints, center points, or
sketch points and the out-of-plane guide curves.
• This is because the Pierce relation determines how the profile
sketch will be solved when it is moved down the sweep path to
create intermediate profiles.
Sweep with Guide curve
Orientation/Twist Control Options
Orientation/Twist Control Options
Orientation/Twist Control Options
Orientation/Twist Control Options
• Sweep follow 1st and
2nd guide curve
Orientation/Twist Control Options
Orientation/Twist Control Options
Guide Curves
Guide Curves: Merge Smooth Faces
Start/End Tangency
Thin Feature
Solid sweep
• cut sweeps
– The most common usage is in creating cuts around
cylindrical bodies.
– This option would also be useful for end mill simulation.
Tool body and path
Cut sweep
sweep cut along a non-tangent path(to check)
Solid sweep
• how Solid sweep handles a tool body following a
helix path
– When you select Follow path for the Orientation/twist
type, and None for Path alignment type, the tool body
correctly follows the tangents of the helix path
Solid sweep
• To keep the tool body perpendicular to a reference as it
follows a helix path,
– select Direction Vector for Path alignment type,
– select a direction to which the tool body remains perpendicular, for
example, the normal to the planar end face of a cylinder.
-The tool body remains parallel to the end face as it follows the
helix path along the cylinder.
- This functionality is important for the tool machining market
Solid sweep
• Tool body must:
– Be a 360-degree revolved feature.
– Contain only analytical geometry, such as lines and
arcs
– Not be merged with the model.
For cut sweeps only, when you select Solid sweep,
the path must be tangent within itself (no sharp
corners) and begin at a point on or within the
tool body profile.
Sweep and solid sweep assignment
Orientation/twist type : Follow path
Path alignment type : None
Loft
To Create Loft
A common Loft example
.‫ مدل نمایید‬loft ‫• سر چکش زیر را با‬
Loft Property Manager : Guide
Curves
Loft Types
Loft : Centerline
Loft : Guide curve and non-planar
profile
Loft : with Start and End
Constraints
Loft : with Start and End
Constraints
Loft : with Start and End
Constraints
Loft : Split Line
‫تمرین‬
‫‪ .1‬مته به قطر خارجی ‪ 20 mm‬را مدل نمایید‪ .‬کلیه ویژه گی های عملکرد مدل شود‪.‬‬
‫‪ .2‬قطعه زیر ‪ impeller‬را به صورت یک جسم صلب مدل نمایید‪ .‬سطوح پره فقط با یک‬
‫سطح مدل شود‪ .‬کلیه لبه های تیز ‪ fillet‬یا پخ زده شود‪.‬‬
‫‪ -3‬با استفاده از دستور ‪ solid sweep‬و منحنی ‪ helix‬با گام متغیر دو نوع پیچ‬
‫انتقال زیر را ایجاد نمایید‪ .‬توجه نمایید که نوک ابزار کروی است‪.‬‬