CCSi designs and manufactures high quality specimen cutting dies completely inhouse at our facility in Akron, OH. Our complete vertical integration allows CCSi to provide exceptional quality dies at competitive prices.
Our process starts with high, quality American made tool steel. We then grind, machine, harden, wire EDM, sharpen, and dimensionally certify the dies. The wire EDM manufacturing process creates perfectly vertical interior walls. This allows the die to be sharpened repeatedly without altering the dimensional characteristics of the sample and provides excellent long term value.
All CCSi dies come with the serial and model number laser engraved for easy identification. Also included is a rugged, foam lined carrying case for protection while the die is not in use.
Our standard dies have no adapters and are intended for use in a “clicker” style press.
CCSi manufactures these high quality Specimen Cutting Dies for determining certain vulcanization characteristics of vulcanizable rubber compounds using an oscillating disk cure meter (oscillating disk rheometer or ODR), as described in ASTM D2084 ‘Standard Test Method for Rubber Property-Vulcanization Using Oscillating Disk Cure Meter’.
The specimen is placed in a chamber, a cavity formed by two vertically opposed cylinders. The lower containing a rotor (biconical disc) which is oscillated through a specified degree of an arc, with ±1º being standard.
The chamber is heated to a specified temperature and closed under a force of 11 kN (2500 lbf), embedding the rotor in the specimen. The volume of the specimen is stipulated as 8 – 11 cm³, which may be calculated as a function of the mass, provided the relative density (specific gravity, SG) is known. A specimen with a specific gravity of 1.15 SG will have a mass of 13 g and a volume of 11 cm³, for example.
Therefore, it is necessary to first determine the density of the subject material, then adjust the mass accordingly after the specimens are die cut. The proper volume of the specimen will cause it to slightly overflow upon closure of the chamber, forming ‘flash’, a flattened circular bead, around the specimen. If the volume is too great (overfill), it may prevent proper closure and negatively effect temperature recovery, too little volume (under fill) may also result in erroneous results.
The CCSi D2084 specimen die is designed to cut a 30mm, circular specimen from a test piece, slightly smaller than the diameter of the cavity. The die-cut specimen is weighed, and the mass adjusted according to the calculation using the predetermined specific gravity. The specimens may be plied, or trimmed, as necessary.
This represents a considerable savings in time over procedures where small pieces are ‘stacked’ to obtain the needed mass. It also improves test determinations by reducing the ‘cold rotor’ effect (the transference of heat from the rotor to a large mass of the specimen material ‘stacked’ atop it) and by reducing the occurrence of chamber ‘overfill’ or ‘under fill’.
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