Plastics Machine Building

Technical parts

The requirements for a machine capable of molding technical parts are complex and challenging including:

• The machine must have high process accuracy which requires a low inertia transmission and high response servodrive
• The process needs to be stable and repeatable which requires a highly efficient, low wear transmission with full digital control
• The injection power needs to be sufficient for short fill times and system heavy duty for long hold-on times

To answer the unique set of requirements for high performance all-electric injection molding machinery, Moog created a unique injection system using a non-linear approach and combined it with our highly dynamic servomotors, servodrives, and machine controllers . The result is a machine offering higher injection rates, minimum power consumption, and reduced maintenance burden yet with the longer hold-on needed for complex technical parts.

Thin-wall parts

Moog has a range of flexible solutions to improve molding of thin wall parts and can help you design linear and non-linear systems that provide

• higher injection rates
• higher productivity
• precise process control

Higher Injection Rates
Machines for molding thin-wall parts require higher injection rates to fill complicated shaped molds in a mere fraction of a second. Higher injection rates require lower system inertia for faster acceleration. Moog’s solution uses a non-linear actuator and highly dynamic servomotor to drive the injection screw. This reduces overall inertia and maximizes energy efficiency, making more power and higher speed available in a shorter time compared with the ball screw/timing belt arrangements widely used on all-electric injection molding machines.

Higher Productivity
Performance of the clamp side determines whether or not a machine realizes its productivity potential. Reductions in dry cycle time can be achieved simply by using a low inertia transmission on the clamping side. Driving the clamp actuator directly instead of using a timing belt transmission results in up to a 50 percent reduction in clamping time.

Using larger motors and drives to drive the actuator on the clamp side increases machine cost. Moog uses sophisticated “field weakening” algorithms on drives to provide more speed from motors with a given torque.

Reductions in downtime also contribute directly to higher productivity. High injection rates subject transmissions to large forces. Therefore, injection units must be designed to be low friction and hard wearing for reduced maintenance burden and total cost of ownership. Moog’s crank and rack-and-pinion type injection units operate for up to 30,000 hours without major maintenance.

Precise Process Control
The transition from injection to hold-on is one of the most critical, quality relevant parts of the injection molding process. Moog’s dynamic servomotors and intelligent drives improve machine control for a more repeatable process and tighter tolerances on part weight.