The high speeds and pressures of high-performance hybrid and hydraulic machines
The exceptional energy efficiency and cleaner molding environment of other all-electric machines
Ultra-high precision and repeatability that exceed belt-and-pulley driven all-electric machines
Available in various model sizes up to 200 tons, the SED Injection Molding Machines features four direct-drive, Sumitomo-built, AC servo motors with full closed-loop control and digital sensors. All four motions — plasticizing, injection, clamping and ejection-are controlled by these motors. Each motion except plasticizing uses a ball screw, and all four motors are beltless, providing superior mechanical efficiency, repeatability and durability, and avoiding the problems associated with belt wear/adjustment and belt dust.
Extensive R&D has gone into the design of the SED motors to achieve a lighter, more compact, low inertia design with the best mechanical configuration for each motion. The result is a low inertia system that draws power only as it is needed, is easier and faster to stop and start, and is exceptionally precise. And the use of permanent magnet stators has made these synchronous motors even more energy efficient.
When you make the comparison with other manufacturers' all-electrics and hybrids, the SED Injection Molding Machine's difference is clear due to features such as:
Up to 50-millisecond velocity response for narrow pitch
connectors and micromolding
Unerring velocity control, from .01 mm/sec to maximum for
improved precision on a wide range of parts
SK-II Control option for the industry's highest level of fill precision
and density control
New CPP clamp design with increased platen rigidity and
improved force distribution
Faster, quieter clamp open/close speed (1200mm/sec)
Added width between tie bars and a larger overall platen area
Unique auto lube system that protects the ball screws and allows
a clean molding environment
Easy-to-use N-VIII control with 12" touch screen, internal memory
for 200 mold setups and full SPC/QC capabilities
3 days free in-plant training
24/48 Month Warranty
The Injection Unit
| Previous Series
This diagram compares the compact, low-inertia, direct-drive configuration of the SED (left) with the previous model. The SED's motor for injection uses a load cell to provide feedback that dictates the speed and torque required for precision injection pressure. The screw drive motor works together with a position transducer.
Sumitomo's commitment to continuous improvement is evident throughout the SED Series. You'll find a wider range of available injection units. Improved performance and energy efficiency. Plus innovative new features that "push the envelope" of precision and repeatability.
The SED's direct-drive motors feature a lighter, more compact, low inertia design — and the advantages of this design are substantial.
First, there's the higher injection power (torque) and velocity. With injection speeds up to 500mm/sec, and injection pressures up to 2900 kgf/cm² the SED provides the performance capabilities for the most demanding applications.
Second, there's faster velocity response, unaffected by belt elasticity. Well-suited for narrow pitch connectors and micro-sized parts, the SE30D, for example, has a 50-millisecond velocity response with a maximum injection velocity of 500 mm/sec.
Third, the SED delivers unerring velocity control from .01 mm/sec to the maximum velocity, providing improved precision on wide range of parts including thick-wall lenses, visually critical and thin-wall parts.
Simultaneous with these performance improvements, the energy efficiency of the motors has been further improved through the use of permanent magnet stators. Being synchronous rather than induction type motors, power is not drawn to maintain position, thus lowering energy use. The new motors also have been designed to accept a broader range of incoming power without requiring a transformer.
For accurate, stable control of shot size, three plasticizing programs allow the operator to set the plasticizing end position and select sharp, standard or soft ramping of screw speed. There are also now 10 modes available for ramping control of injection fill and hold, and screw pullback delay has been added as standard.
The SED's PID temperature control system optimizes melt conditions with 2-second sampling and 0.1°C settable barrel zones. A Fine Flow Control screw assembly, for easier color change and superior pressure transmission, is standard.
Programmable switchover from velocity to hold — selectable by position, external signal, or pressure — delivers precision filling. Hold pressure is settable and accurate to 1kgf/cm2 from 0 to 2400 depending on machine size.
Flash Speed Mode (Standard)-At injection speeds of 300mm/sec and higher, the SED automatically goes into Flash Speed mode. In this mode, fast response control of velocity and pressure, before and after V/P switchover, prevents short shots and warp from overpacking.
Synchro-Plast Control (Option)-For resins with low viscosity or uneven pellet size, this option optimizes the control of both screw position and back pressure, ensuring plasticizing stability.
The Industry's Most Advanced Injection Control
The SK-ll Control option uses a specially designed screw tip assembly and control software to:
Eliminate back flow during screw pull back
Improve shot density control by pre-set pressure and forward
screw speed, automatically compensating for any changes in
Achieve new levels of fill precision (weight and density) and
peak pressure stability
On completion of recovery, the check ring is mechanically sealed, completely shutting off material flow (or back flow). Pressure is then put on the screw prior to injection. When the pre-set pressure is reached, the machine control calculates the required density correction for the next shot to achieve the correct shot weight. The pressure and speed at which the forward motion occurs are set on the Injection Option control screen for the SK-ll.
For clamping and ejection, the SED features two, direct-drive, digitally controlled AC servo motors. Full closed-loop control of mold open/close position and speed, plus monitoring by precise optical encoders, ensure maximum mold protection and consistent molding cycles.
The SED has "raised the bar" for clamping performance with several significant
improvements and added features.
New direct-drive technology has allowed the clamp open/close
speed to be increased 50% — to 1200mm/sec — and vibration has
been lowered, for improved cycle times and smooth, quiet operation
Faster response time and a higher ejector speed of 333mm/sec
are also made possible by the SED's direct-drive technology
The new CPP (Center Press Platen) clamp design plus the
SED's increased platen rigidity provide improved force
distribution, elimination of short-short and flash problems,
and improved mold protection
The horizontal clearance between tie bars has been
extended, allowing for the installation of larger mold
bases and ease of mold changeover
Connecting ejector rods from the mold to the knockout
plate is easier now, too, due to added access space
A new ejector impact absorber feature helps prevent parts
from sticking to the ejector pins
Moving platen supports have been redesigned with a larger
shoe for added support area-and they've been made a
Other features added as standard include an emergency
stop button on the non-operation side and a clear, PMMA
window on the clamp guard
Applications flexibility and superior mold protection
SED clamp operation also provides the capabilities needed for a wide range of applications. Three-stage mold open/close speed control can be used to tailor machine operation to specific mold requirements. Excellent clamp force linearity, from low to high tonnage, enables optimum setting of clamp force to suit parts with different projected areas. And selectable auto-ramping modes can be used to optimize clamp open and close profiles for fast cycling with shock-free movement.
Optional multi-toggle clamp force control offers two modes: a high-cycle mode in which filling can begin during clamping for improved cycle time; and a gas-release mode in which filling can begin during low-pressure clamping for improved part quality.
Plus, mold protection is never an issue with the SED. With low pressure mold protection settable to 0.3mm, and mold open/close positions settable to 0.1mm, precision mold protection is ensured and there's no banging — even at high speeds. Mold open stop position accuracy of 20 microns, an important factor for take-out robots and 3-plate molds, is ensured with monitoring by precise optical encoders and full closed-loop control.