Some mould makers prefer to perform certain rough machining operations on the mould block before the mould undergoes normalizing heating, while others prefer to carry out the latter process immediately after receipt of the steel. Where the former method is…
Of all the casting processes, i.e. casting is by far the best suited to the high production of quality parts. There are some restrictions as to the metals which can be supplied as die castings and as to the complexity…
Castings Materials:Any resin available in liquid form can be cast. Castable resins include phenolics, polyesters, epoxies, silicones and acrylics. Types of molds The type of mold used depends on the plastic, the size and shape of the part, and other…
Elements of Plastic Mold Tooling Costs Besides the time in hours required to build tools for a given plastics part, the items of materials, maintenance and amortization of the tools enter the estimate. Overhead costs for keeping the toolroom also…
Estimating System for Plastic Molds Cost estimating for plastics molding requires thorough consideration of several factors. These factors may be listed as follows: 1. Estimate of tooling costs. 2. Estimate of plastics materials and other raw materials costs. 3. Estimate…
What Is Electroplating or Electro-Deposition? Electroplating or electro-deposition is a process whereby atoms or molecules (the smallest indivisible portions of a substance having the properties of the substance) of metal or some other material are precipitated from a liquid solution,…
Decorative vs Industrial or Hard Chromium Plating Chromium plating manifests itself in two commercial forms namely “decorative” and “industrial” or “hard” chromium plating. The nature, functions and purposes of the two types are distinctly different, and they are not interchangeable.…
HARD CHROMIUM PLATING FOR THE PLASTICS INDUSTRY The purpose of this paper is to fully analyze the relevant technical problems of the electroplater and those of the plastics mold, tool, die and equipment manufacturer in an effort to effect a…
What hardness for plastic molds? How hard should a plastic mold be? A tempest in a teacup has been raging since the first attempt to swap ideas on plastic mold design. To one molder, 48 Rockwell “C” is sufficient; to…
THE DESIGN OF A SIMPLE INJECTION TYPE MOLD An injection type mold is a mold into which a plastics material is introduced from an exterior heating, or plasticizing, cylinder. Such a mold operates at a constant temperature; cool, or slightly…
