DME Pre-Machined Insulator Sheets Cut Time, Labor Costs

Originally titled 'Pre-Machined Insulator Sheets Cut Time, Labor Costs'

DME offers a line of pre-machined, high-temperature insulator sheets for standard mold bases.

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DME offers a line of pre-machined, high-temperature insulator sheets for standard mold bases. Pre-machined features include a locating ring clearance hole, assembly screw clearance holes and insulator sheet mounting holes. By pre-machining the sheet to this extent, moldmakers can save labor, time and machine wear, DME says.

The insulator sheets are made of high-compression-strength, asbestos-free material with a maximum recommended service temperature of 550°F, making them well-suited for high-temperature applications. According to the company, the thermal insulating properties of the glass-reinforced polymer composite material inhibit heat transfer from the mold to the platen or from the platen to the mold (depending on the application), conserving energy and prolonging machine life.

The insulator sheets are used on molds and dies between the top clamping plate and the stationary platen, and between the bottom of the ejector housing and the movable platen. They have been redesigned 1/16" shorter on all sides to prevent damage during mold handling and are available in standard 1/4" or 1/2" thicknesses. Custom sizes and machining also are available upon request.

The company also has added two larger sizes to its three-plate extension bushings product line. These two new sizes are available with machine nozzle spherical radii of 0.50" and 0.75", and offer a larger nozzle clearance of 3.765". Made from AISI 4140 steel and hardened to 28-32 HRc, the extension bushings are designed to reduce sprue length to save material, reduce cycle time and help prevent runner hang-ups in three-plate molds by aiding in the ejection of the runner from the mold.

DME also has added new sizes to its Black and Gold top and side interlock product lines. In addition to existing widths from 3" to 3.5", the top interlock line now includes smaller male and female widths ranging from 1" to 2.5". The side interlock line also includes smaller male and female widths of 1" and 1.25", and a larger width of 6". The interlocks are coated with Melonite, a telluride mineral of nickel that improves wear and corrosion resistance, as well as provides more positive alignment of mold plates for longer. Each component can be replaced independently of the others, eliminating the need to swap out an entire set, as required by traditional interlocks. Male top and side interlocks are made from AISI H13 steel and heat-treated to 40-44 HRc, while female interlocks are made from A2 steel and core-hardened to 58-62 HRc.