Japan’s Nissei Plastic Industrial Co., Ltd., recently developed a new hybrid type vertical injection molding machine, dubbed the TWX220RIII25V, which offers one of the industry’s lowest machine heights with a 2,110-kN (220-ton) clamping force. Nissei will accept orders starting on May 1, 2019.
|The new WX220RIII25V vertical injection molding machine (above) is significantly lower in profile than the old 220-tonne type (below).|
The TWX220RIII25V was developed based on the best-selling TNX-RIII Series hybrid type vertical machine, which is widely used for numerous insert molding applications in the automotive and electronics industries. It is equipped with a new compound-type clamping mechanism and offers low-profile structures throughout the machine.
The most notable feature of the new machine is the compound type clamping mechanism that realizes a more compact machine size. It consists of a high-speed cylinder, high-pressure clamping cylinder, and half-nut mechanism, which replace the conventional type cylinder that controls both high-speed clamping and high-pressure clamping with one clamping cylinder. Because of this new mechanism, the mold mounting height is lowered to 1,000 mm (about 30% lower than conventional machines), making mold installation/setup, insert, and product takeout easier than ever before. The overall machine height is about 10% lower, offering excellent flexibility for the installation space (height).
The new machine is also equipped with a direct-pressure type clamping mechanism that evenly transmits clamping force. It is resistant to temperature change, generating consistent clamping force according to the setting. Setting optimal (low) clamping force, which is gentle to the mold, is easy, and its simple and clean mechanism maintains the machine precision for an extended period. Further, the quantity of hydraulic oil required has been reduced by 52% thanks to the new compound type clamping mechanism (saving resources and cost).
In addition, the TWX220RIII25V’s optimized bed structure permits flexible robot layout. It can easily be incorporated into automated systems with takeout robots, articulated robots, and two-arm robots ideal for different molded products and molding processes. Further, its design permits easy conversion to a three-stage mold mounting face.
The machine is equipped with a three-tie-bar wide turntable, and the mold open/close stroke and maximum daylight opening are 100mm wider, accommodating more complex and larger molds. Turntable rotation and ejector motion are driven by servomotor, achieving faster cycle, smooth mechanical motion, and high rotation stop precision. It can prevent the misalignment of the inserts.
A concept machine was exhibited at the Nagoya Plastic Industry Exhibition last October. Since the expo was held in Tokai region, the area where many automotive parts suppliers who need vertical machines are located, it was well-received for its compact design that revolutionizes the concept of the vertical injection molding machine. Nissei plans to manufacture 40 of the 220-ton injection machines annually.