Week 10 - Challenge 2- Attachment Feature Creation (Dog House)

What is draft analysis?

A draft analysis is used to see if the draft of a part is sufficient for the molding process and if the part will separate correctly from the mold. The draft refers to the angle between the face of a part and the direction of pull (refers to direction of the selected plane/face of a part) of each mold side.

Draft angles ?

A draft angle is calculated as a degree measurement (or, less often, an inch or millimeter measurement) from the vertical axis of a mold, and it helps account for thermoplastic shrinkage, a practical reality of the injection molding process for most materials.

TOOING DIRECTION ?

Tooling design is a specialized area of manufacturing engineering which comprises the analysis, planning, design, construction, and application of tools, methods, and procedures necessary to increase manufacturing productivity.

WHAT IS CLASS A, B, C SURFACES ?

Class A Surfaces

Class A surfaces are the highest quality surfaces and are typically found on the visible, outer parts of a product that end-users see. These surfaces require the highest level of finish and precision.Class A surfaces are free of any visible defects, imperfections, or blemishes. They have a flawless appearance with no visible waviness, distortion, or surface irregularities.These surfaces are often used for exterior car body panels, consumer electronics, and other products where aesthetics and appearance are critical.

Class B Surfaces:

Class B surfaces are of medium quality and are used for parts that are not directly visible to the end-user but are still visible when the product is disassembled or inspected closely.While Class B surfaces are not as critical in terms of appearance as Class A surfaces, they still need to meet certain quality standards and be free from major defects. Some minor imperfections may be acceptable.Examples of Class B surfaces can include the interior components of a car, where the surfaces are not as visible as the exterior but still need to have a reasonable level of finish.

Class C Surfaces:

Class C surfaces are the lowest quality surfaces and are typically used for parts that are entirely hidden from view once a product is assembled.These surfaces do not require a high level of finish or precision. They may have visible imperfections and may not be cosmetically appealing.Class C surfaces are often used for internal support structures, functional components, or parts that are concealed within a product and do not affect its appearance.

An explanation should be given on the way of creating the tooling axis, particularly the Bisecting methodThe best direction for Class A surface inspection is the largest direction seen from the normal angle. Then subtract the area, create a point and create a line.

 To evaluate a Class A surface, it's important to identify the optimal viewing angle that provides the best visibility of its edges in a normal view.

Once the ideal viewing direction is determined, proceed to extract the specific surface of interest. Afterward, create a point on this extracted surface and extend a line from that point.

 

 

 The draft analysis has been completed on the final body. Please disregard the doghouse portion, as it will be produced using a different tooling axis.

On the solid body, you will notice areas highlighted in green, indicating a draft angle of 3 degrees or greater. In contrast, areas highlighted in blue represent a negative draft angle, which is a requirement for the base side of the solid body.

There are also some red portions present on a surface, denoted as 'A,' which will appear in certain areas. The red lines represent fillets, which are considered acceptable.

 When the draft angle measures 2.9 degrees, you may observe some areas turning green, and this is considered acceptable.

The presence of red color indicates that these areas are vertical portions.

 

 For the dog house, two different tooling axes have been established. The first axis is intended for the outer part, and it is indicated by the green color, which signifies a draft angle of 1.5 degrees.

In terms of measurement, a value of 1.45 has been used, considering the tolerance.

The inner portion of the dog house is displayed in blue, but it's not essential to focus on it because a separate tooling axis will be employed to create the inner part.

 

 The inner portion is shown in green when using the second tooling axis. However, it's important to note that the second tooling axis should be set to a horizontal orientation.

For the inner part, a draft angle of 0.5 degrees should be taken into consideration.