Base Bracket Design

DRAFT ANALYSIS AND PLASTIC MODELING OF BASE BRACKET DESIGN

OBJECTIVE:

The main of this project is to perform the Draft Analysis and model the Base Bracket Design through the given Class-A surface. Beginning with the creation of the tooling axis, Class B surface development, and then Class C surface and then merging Class A, B, C surfaces to form a plastic component. BY considering the thickness as 2.5mm

ABSTRACT:

Draft:

• A draft angle is a slant that is applied to each side of most features of an injection molded part. In other words Draft is providing tapers on the product features such as walls ribs posts and bosses that lie parallel to the direction of the release from the mold part ejection
• The nominal draft is 3mm for plastic components and for automotive sheet metal components is 7mm

Tooling axis :

• It is defined as the direction in which the molds opens or core and cavity, with the help of tooling axis created along x and Y axes are used for creating the Main Tooling axis by using the bisecting method

PROCEDURE

Connectivity of Class A surface:

• The first and foremost thing to do is to check for the connectivity of the surfaces this is to ensure that there are no gaps between the surfaces if gaps are present then it should be resolved.
• This can be done visually or by creating boundaries, if their gaps are present they are graphically represented by green lines. If not while performing boundary command it shows an error.

Creation of Dummy axis :

• This is a normal line which we construct by analysing the best possible direction(X/Y/Z axis) for the draft for the part, this axis is only for reference and is not used for Tooling Axis

Creation of Tooling Axis for Class A surface:

• Taking the dummy axis as a reference, intersect the class A surface along the different axis (XY/YZ/ZX ) Check for the possible places where the part might face difficulties while ejecting the component from the mold.
• Lines are drawn at the places where the part boundary has difficulties
• Later the Tooling axis in one direction (let’s say X) is obtained by bisecting the lines drawn in the above process
• In the same way, the other axis is also checked and then the Tooling axis in another direction(let’s say Y) is drawn

Now both Tooling axes are bisected and the final Tooling direction is obtained which is further used for all draft analysis axis and later unto developing Class C and Class B surfaces.

Publication:

• The publication is used for easy access to published components. These will come handy while modeling (we are not required to search the entire tree structure for a particular operation) 

DRAFT ANALYSIS:

• Click the Inset—Analysis -- (Feature) Draft Analysis icon
• If material is not on There will be a warning message is shown and then we need to select the material
• The Draft Analysis dialog box is displayed. It gives information on the display (color scale), the draft direction, and the direction value

DEVELOPMENT OF CLASS B SURFACE:

Class B surface is created by extracting each wall and untrimmed walls extrapolating the walls and then trimming the extra surfaces and offsetting it to a certain value based upon the thickness of the component where it is 2.5 mm. The offset surface will be the B-Surface

DEVELOPMENT OF CLASS C SURFACE :

This surface is obtained by sweeping the boundaries of the Class A surface along the Tooling Axis direction, it connects A and B surfaces

 Using B and C surfaces a closed surface is formed by trimming the extra surfaces 

The Final trim part is converted into a solid component using closed surface command

The Final trim part is converted into a solid component using closed surface command.

CLOSED SURFACE PLASTIC MODEL: