Week 9 - Project 1 - Door Trim Lower with Engineering Features
Heat Stakes,Dog House for the Door Trim
Objective-
To Create the Dog House, locators and heat stakes on A Door lower trim through the given Class-A surface by creating tooling direction, the tooling axis for the given Class-A Surface should meet the requirements of the draft angle i.e. minimum 3°and at the end to perform the Draft analysis on the model.
- DOG HOUSE
Dog house is an engineering feature used in plastic trim design. Doghouses are used as supporting feature. Sometimes other engineering features like snaps; locators etc. are mounded on them to increase their strength. Dog houses are subjected to draft analysis to prevent breakage of the component during ejection from mould cavity. Dog house and other engineering components are built on B-surface.
Dog House Design Consideration-
- HEAT STAKES
Heat staking also known as thermoplastic staking is the process of joining two dissimilar materials together. In heat staking we use local heating and cooling to raise the temperature of plastic components and allow plastic reforming to be carried out. This reforming can be used in a wide variety of applications.
Draft Analysis-
Designers of plastic parts and mould tooling manufacturers can use the Draft Analysis tool to check the correct application of draft to the faces of their part. With draft analysis, you can verify draft angles, examine angle changes within a face, as well as locate parting lines, injection, and ejection surfaces in parts.
The Draft Analysis command enables you to detect if the part you drafted will be easily removed.
This type of analysis is performed based on colour ranges identifying zones on the analysed element where the deviation from the draft direction at any point, corresponds to specified values.
Creation of the Tooling Axis-
The Desired tooling Axis is created by the analysis of the direction of the tool in with the part production will be maximized and the cost should be minimum and the least amount of cores and side cores should be used to manufacture the designed part. Here the part which are manufacturing will be created with the help of injection moulding so all the parameters are applied to designed the part.
As Analysed the best tooling direction will be near the y axis so a section intersection is created with the desired plane to obtain the part profile in 2d figure.
Then with the help of the below shown inclined lines two lines are created and then main line which is the bisecting line of the two lines is created as shown so.
With the help of that line the draft analysis is then done on the provided A-class surface to check the outcome.
Creation of Class B, C surface-
After the analysis is done then the provided surface faces are extracted and then they are off-setted to the thickness value which is 2.5mm below the A-class surface after that the extracted surfaces are untrimmed and extended with the help of untrim and extrapolated command in Catia v5 and are trimmed with the other extracted surfaces. Below are the images of the extracted surface.
A Class
B CLASS
C CLASS
For creating the C- class surface once the B-class surface is created then form the A – Class surface the with the help of sweep command and with the tooling direction another surface is created intersecting the B Class surface created and then the surfaces are trimmed to get a single desired surface.
Draft Analysis Reports-
A CLASS DRAFT
B CLASS DRAFT
FEATURES DRAFT
DIFFERENT VIEWS
REPORT PREPARED BY
Rishabh Soni