PIPE DIES | MACHINERY
Tooled up: advances in pipe dies
The latest applications in pipe dies include models that reduce scrap, boost line speed or allow automatic adjustment of dimensions on the fly
Tooling is crucial to the smooth running of an extrusion operation – and as producers look to streamline and accelerate production, many will look to new designs of die to achieve this. Davis-Standard has introduced its 3000A
(automatic) crosshead for rubber hose applications. The 3000A crosshead helps hose manufacturers
reduce scrap and accelerate start-up times for smaller lots. This results in material savings, quick product changes, simpler maintenance and improved quality, says the company. “Every component on the 3000A is engineered
to improve processing while providing cost savings,” said Joe Wnuk, vice president of elastomer and profile systems at Davis-Standard. “There are production advan- tages when it is used as part of a fully integrated and automated elastomer line, or when used separately as a second step in the manufacturing process. In many cases, the return on investment can be realised in less than a year.” The proprietary crosshead
incorporates an automatic, servo- driven concentricity adjustment system, in which the core tube/tip assembly is adjusted via joystick control. This helps the operator to minimise eccentricity, boost concentricity and reduce down- time during product changeovers.
www.pipeandprofile.com
In addition, the servo drives enable monitoring and adjustments throughout the run to account for variations between lots, between day and night production, and corrections for gum space adjust- ments. A hydraulic pump system is not needed, and the compact design does not require hoses. Features such as a tapered mandrel and engi-
neered flow paths ensure consistent flow through all speed ranges, says the company. The thrust bearing supported core tube/pin assembly enables wall thickness modification under pressure without interruption. Die adjusting screws are located in removable inserts to protect the body from thread damage. A larger surface area in the
water jacket improves heat transfer efficiency. Models are available to accommodate 2in (50mm), 3in (76mm), 4.5in (102mm) and 5.5in (140mm) diameter braids. “One of the best features of this
automatic design is the precision adjustment, which contributes to material savings due to tighter tolerances within specifications,” said Wnuk. “This is especially valuable with frequent product and dimension changes, which are becoming more and more common.” Davis-Standard’s aftermarket group can review existing lines to
May 2020 | PIPE & PROFILE EXTRUSION 31
Main image and below: Davis-Stand- ard’s 3000A crosshead helps hose manufacturers reduce scrap and cut start-up times for smaller lots
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50
