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MD-S8000 SERIES

 

MD-INJECTION

• COMPACT AND SELECT INJECTION UNIT

2 Axes Structure    

          Compact and selectable injection unit. two

types of injection units can be mounted on one

model.

 

 

 

• STRONG INJECTION : Long holding time

          NIIGATA's standard injection unit provides superior

performance for long holding pressure although

LP spec is available as an option.

• EXTREMELY SLOW INJECTION SPEED : 0.01 mm/sec

          Precise injection speed control by 0.01 mm/sec. high resolution encoder of 22 bit/rev (4194304 pls) enebles extremely slow injection of 0.01/sec.  stable  low speed and repeatability for thick-walled molding.

 

 • SCREW VARIATION : 0.01 mm/sec

          Wear-resistant screw and barrel as standard spec. Selectable screw designs for various usage and material.

 

 

 

 

 

 

 

• PLATED FEED THROAT BUSH : Rust  & Contamination prevention

         Plated bush of hopper inlet pevents rusting and rust contamination

must have for translucentoptical parts molding.

         Prevents corrosion caused by fluororesin.

• NOZZLE TEMPERATURE CONTROL : (Group control)

          NIIGANA's original temperature control delivers subtle 

temperature setting using 2 heaters and 3 sensors. Sensor

position can be virtually changed by weighting sensor. stable

control of temperature of resin inside nozzle prevents

cobwebbing, drooling and clogging.

MD-CONTROLLER : VERSATILE & PRODUCTIVE

• BPF CONTROL : Unforced filling

          Filling balance is improved by pausing injection that enables unforced filling and dispersion.

                                                                  - Effective for multi-cavity mold, thick-walled mixed parts.

                                                                  - With thick-walled parts, due to changes ingate sealing and skin layer forming,                                                                        surface quality and mold release are improved.

• CPF CONTROL : Peak pressure control  

          ◘ CPF (Constant Pressure Filling) control 

                 - Injection speed decreases as filling progresses.

                 - Pressure maintained when filling pressure reaches to setting value.

                                                                                                                                                     

                                                                                                                                                      ♦ No peak pressure

                                                                                                                                                      ♦ Residual stress reduced

                                                                                                                                                      ♦ Burr, gas burn, deformation improved

   

          ◘ Conventional control 

                 - Filling speed maintained.

                 - Pressure increases as filling progresses.

                 - Peak pressure when filling completed.

                                                                                                                                         

 

                                                                                                                                                      ♦ Peak pressure arises

                                                                                                                                                      ♦ Residual stress 

                                                                                                                                                      ♦ Burr, gas burn, deformation

 

• FLEXIBLE V/P SWITCHOVER

            • Pressure response at the time of shifting from filling process to holding pressure process can be configured.                  • Reduced internal stress inside molded product improves warping and burr.                                                                                                                        

• INJECTION SPEED VECTOR CONTROL 

          Selectable deceleration method for injection speed. Accurate speed switch is possible even with high speed injection.

          ◘ Conventional control (time oriented)

              - Acceleration - start from switch position

                  - Deceleration - start from switch position

          ◘ Vector control (Position oriented)

              - Acceleration - start from switch position

                  - Deceleration - completes by switch position

• STEP CONTROL/POLYLINE CONTROL

         

          Individual setting for injection speed, pressure, back pressure, screw rotation. Speed changed, pressure change method can be selected.

   ◘ Step control                                                                                                                                   ◘ Polyline control 

    - Speed, pressure control by stage                                                                                                                                           - Speed, pressure change in slope

    - Steep change of speed, pressure                                                                                                                                           - Gradual change of speed, pressure

    - For thin wall, multi-cavity mold                                                                                                                                               - For flow mark, jetting improvment

• REVERSE SEAL

          Screw rotation is reversed when metering is complete.

Due to resin pressure difference in front and back of the trap

ring, the trap ring is moved to the inter ring then stops the -

resin flow. Stable parts weight is maintained by minimizing

variation of keeping seal timing.

         

 

• OTHER FEATURES

          ◘ Low pressure clamp force holding

          ◘ Pre-Release of clamp force

          ◘ Screw rotation torque monitoring

          ◘ Ejector torque monitoring

          ◘ Selectable nozzle touch force

MD-SERVO SYSTEM : FAST & ACCURATE

• NIIGATA SERVO CONTROL SYSTEM

     NIIGATA Pressure Feedback Control combined with MITSUBISHI servo system MR-J4 delivers accurate control of injection pressure.

          ◘ Fast time control of 1/1000 sec.

          ◘ Long time holding pressure by original control technilogy.

          ◘ Direct communication between digital load cell and servo amplifier for high responsiveness.

                                                               

• DIGITAL LOAD CELL : High responsive pressure control

          ◘ High noise resistance

                    Accurate control of injection pressure and back pressure

          ◘ Accurate pressure control

                    Precise pressure control by 0.1 MPa

          ◘ High responsivity pressure control (active pressure control)

                    Forward rotation of servo motor when pressure increase

                    Revese rotation of servo motor when pressure increase 

 

 

MD-SET UP : OPERATOR FRIENDLINESS & PRACTICAL

 

• NIIGATA HIPER NAVI : Integrated Information

 

• REDUCED SET UP TIME

                                                                                            - No need to enter mold height and clamp force (for molds with                                                                                                   spring too)

                                                                                            - Accurate adjustment of clamp force

                                                                                            - Automatic detection of pressure for mold protection

                                                                                            - Purge during clamp force adjustment and low pressure mold                                                                                                     protection setting

• CONDITION SETTING/ADVANCED SETTING 

 

 

MD-MAINTENANCE : EFFICIENT & VISIBLE

• REDUCED OPERATING COST

• VISUALIZING OPERATING COST : Energy consumption

     ◘ Electricity consumption displayed.

          - Electicity consumption of motor and heater

          - Electicity consumption per shot

• HIGH RELIABILITY AND EASE OF MAINTENANCE 

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Peak pressure reduced by pause time
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