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…
Air Hardening Tool Steels Air hardening tool steels find their chief applications, as far as plastics tooling is concerned, as materials for hobs, impression parts which require extremely low distortion on heat treatment, and cutting tools for fabricating the molded,…
Carburizing Steels Plain carbon and alloy carburizing steels may be obtained in S. A. E. grades, and in grades very nearly conforming to S. A. E. analyses, but sold under trade names. These steels are used for many kinds of…
Mould cooling systems The most effective cooling method for any mould would be to pump the coolant through the cooling channels counter-current to the flow of molten plastic into the mould- This method is adopted for pressure die casting and…