The pattern is the first critical step in the production of castings. High-quality castings can only result from a high quality pattern. At Richmond Foundry, meeting the customers’ requirements comes first. Pattern construction can be made from wood, metal or resin from a customer’s sample, drawing or both. Upon completion of the pattern, Richmond produces and evaluates samples to guarantee that all the customers’ requirements have been met as cast. Once the customer sample has been approved, production is implemented. Richmond Foundry LLC possesses the capability to construct new patterns or adapt existing patterns from other foundries.

The main function of a pattern is to:

  • Shape the mold cavity
  • Provide accurate dimensions
  • Provide a means of delivering liquid metal into the mold (this is the gating system)
Pattern Shop

A single piece pattern, or loose pattern, is a replica of the part desired. Gated patterns connect a number of loose patterns together with a series of runners that direct metal flow to the critical areas of the mold.

Match plate patterns, known as the cope and drag, are mounted on opposite sides of the board. This allows for the patterns to be quickly pressed into the molding material. This type is used for larger castings.

All patterns are constructed with allowances for dimensional or structural changes that occur during the casting process. These allowances are for shrinkage when the alloy metal solidifies in the mold. The amount of shrinkage depends on the type of metal and on the sand casting process used.

Our complete pattern shop has the capabilities to mount patterns and perform modifications.  Markings, runners, gating and risers can be adjusted for production anomalies, such as shrinkage or distortions during metal solidification. This inhouse capability allows Richmond to provide quick turnarounds of any pattern modifications necessary to achieve client timelines.

Richmond’s engineering team has complete quality control and the ability to modify a pattern as required to accommodate changes in conditions. Our engineers are always glad to sit down with our clients and determine what patterns are needed or if an existing pattern can be altered to fit the customers’ current requirements.

Learn more about Richmond Foundry LLC