Niehoff's D 1251 double twist buncher works at 1200 tpm
PUBLISHED: 12 Jan 15
Inside Niehoff's D 1251 double twist buncher
In a permanent and close cooperation with renowned cable manufacturers, Maschinenfabrik Niehoff has been designing and building bunching machines and stranders since 1966. The result of this development was the D series of double twist bunching machines whose biggest model, the D 1251 type version, works with a pulling force of 12,000 N. Also its production speed is impressive: In one industrial application, for instance, when used for the manufacture of conductors with a 7 x 3.05 mm design and a compaction of 10 percent the machine works at a speed of 1,200 twists/min (tpm). This is approximately three times as fast as the industry standard production speed!
The D 1251 is foreseen for the manufacture of copper wire strands with a cross-section of up to 95 mm2 and aluminum wire strands with a cross-section of up to 120 mm2 with a steplessly variable lay length of 40 to 500 mm. The strands can be compressed or formed into sector-shaped conductors. The D 1251 is designed for spools with a flange diameter of 1250 mm and a maximum weight of 4 tons. Another advantage of the machine is that no special foundation is required for its installation.
Like all machines of the D series, the D 1251 features a single-bow design and contactless machine data transmission. The result: Lower energy consumption, lower noise emissions, lower maintenance costs than with double-bow machines.
All the new D type machines are operated using a network-compatible Human Machine Interface (HMI) color touchscreen monitor called NMI (Niehoff Machine Interface) which clearly displays any information, instructions and system status messages in the language of the operator. The winding tension is infinitely adjustable and is precisely regulated by an integrated load cell throughout the entire winding operation. The result: Compliance with closest production tolerances and reduction of material use.
Complete Solutions from a Single Source
Maschinenfabrik Niehoff with an experience of more than 60 years engineers and manufactures - except for extruders - nearly all machinery needed for the production of wires made from non-ferrous metals as well as automotive, data and special cables. The Niehoff Group offers products and services that range from development and planning to turnkey projects of complete cable factories. The portfolio includes technical assistance by specialists who speak the languages of the customers, the reliable supply of original Niehoff spare and wear parts, machinery inspection, equipment upgrade and corrective maintenance as well as machine operator and maintenance training courses.
The Group employs about 750 employees worldwide and operates from its headquarters, five manufacturing subsidiaries (in Brazil, the US, the Czech Republic, India, and China) as well as sales and service centers in Japan, Singapore, and Russia.
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