The Basic Mold Process Can Be Summarized in Seven High-Level Steps:
1. Preparing and Analyzing Design Models
• Drafts, draft/ thickness checks.
2. Creating the Mold Model
• Reference model, shrinkage, and workpiece.
3. Creating Mold Volumes
• Sliders and other sketched volumes.
4. Creating Parting Surfaces
5. Creating Mold Components
• Split Mold Volumes and create cavity insert parts.
6. Creating Mold Features
• Waterlines, runners, and ejector pin holes.
7. Filling and Opening the Mold
• Create a molding and open the mold.
Figure 3 – Filling and Opening the Mold
Preparing and Analyzing Design Models
When you create a mold for a design model, you should first inspect the model and analyze it to verify that it is indeed ready to be molded. Typically, the reference model geometry that you use for a mold model is derived from the design model. You can analyze the design model and reference model for adequate draft features and consistent thickness, adding draft features if necessary. It is critical that the final reference model has sufficient draft so that it can be cleanly ejected from the mold.
Creating the Mold Model
Start the mold design by creating a mold manufacturing model. Creo Parametric automatically creates the mold assembly when you create the
mold manufacturing model. The mold manufacturing model is also referred to as the Mold Model. Next, you assemble the reference model, which can be either the design model that is to be molded or a new model derived from the design model. You can account for the contraction of the molding part during cooling in the molding process by applying a shrinkage factor to the reference model. You also create or assemble the workpiece that represents the full volume of all the mold components that are needed to complete the mold model.
Creating Mold Volumes
You can create mold volumes manually using sketch-based features. A mold volume is a three-dimensional, enclosed surface quilt with no mass in the workpiece of a mold model. You can also create a special type of mold volume called a slider, automatically, by having Creo Parametric detect undercut areas in the mold model.
Creating Parting Surfaces
You can create parting surfaces for the mold model using the skirt surface technique. The skirt surface technique requires parting lines that you create by using silhouette curves. You can use the parting surfaces to split the workpiece into separate mold volumes later in the mold design process. You can also create parting surfaces manually.
Creating Mold Components
You can split the workpiece volume into one or more mold volumes based on the parting surfaces. The main mold volumes are classified into core and cavity. Once the desired mold volumes are created and split, you can create the mold components, including sliders, from the mold volumes. The mold components are fully functional parts that you can open and modify in the Part mode of Creo Parametric. You can also machine the components using Creo NC.
Creating Mold Features
You can create regular and user-defined assembly features to facilitate the molding process. Regular features include mold-specific features such as waterlines, runners, and ejector-pin clearance holes. You can also create user-defined features from regular cuts and slots that are placed on mold models to create sprues.
Filling and Opening the Mold
You can create the molding component that represents the filled mold cavity.
Creo Parametric creates the molding component automatically by determining the volume remaining in the workpiece after extracting the mold components.
You can then define the steps for the mold-opening process for every component in the mold model except the reference model and workpiece.
During the mold opening analysis you can determine whether there is interference with any static components for each of the steps that you define.