ＤＤＶ Hydraulic Servo Pump Series

Wide choice with outstanding features

Opton has spent 15years of researching and development of DDV hydraulic servo pump as decisive solution of
various problems with large-sized hydraulic pipe benders, and now the developed products are lined
in wide series of capacities and features
as a new generation NC hydraulic solution device for improving many serious concern like accuracy stability,
noises, heat generation,lubricant consumption and coolant requirement.

1)DDV Hydraulic Servo pump in two major application patterns

  This product, once installed as a hydraulic source to a new production facility,
  energy- &, space-saving yet with higher accuracy performance becomes realistic to make advantageous difference
  with competitors. This product, if installed in a package for replacement to an old production facilities,
  all disadvantages currently existing will find out the way out. 


2)Opton's DDV Hydraulic Servo Pump by features ;

①High accuracy and longer stability

  ＤＤＶ Hydraulic Servo Pump is composed of two main mechanics connected in hybrid design concept, 
  one is a reversible piston pump powered by non-leak type constant volume hydraulic media and the other is
  AC servo drive. Operation concept is that three operation factors of the cylinder, or velocity, direction
  and thrust force are controlled by the number of turns, direction and torque of AC servo drive.
  This means that the piston pump works as hydraulic-powered reduction gear installed at the AC servo drive,
  and therefore requires no magnetic valve that is a must for conventional hydraulic system.
  This leads to an advantage of high operation accuracy totally uninfluenced by oil temperature,
  thus can utilize almost full performance of AC servo drive.

②Thermal and noise generation in negligible level

  Conventional hydraulic servo valve causes high heat generation by actuator oil passing in a narrow throttle valve,
  and more than 50% of the total electricity is wasted as heat with the balance only left for effective power.
  A large hydraulic container and complicated distribution system and pump resonate to create uncomfortable noise.
  DDV hydraulic pump, thanks to no throttle valve needed and the pump staying stopped when the cylinder at its
  halt-mode, causes heat generation at only 5% or less worth of total input electricity or more than 95% for real works.
  The noise would be leveled at only 1/10 of the conventional system.

③DDV with small-sized air-cooled tank against conventional system with large-sized tank

  Conventional hydraulic system normally needs large-sized hydraulic- and water-tank to avoid heat-derived
  deterioration  of hydraulic quality. The DDV Pump, thanks to non-leak type system, causes little quality
  deterioration only from minimal level of heating, thus no large-sized tank needed and hydraulic media required
  only 1/10 or less as that of conventional one, and air-cooling system is sufficient..

④DDV pump applications

  Save-energy & accuracy enhancement of an existing machine with servo-valve type hydraulic system
  A complicated hydraulic distribution system with magnetic valves and a large-sized tank are removed
  and a linear scale is mounted on the NC axial cylinder.One DDV pump is mounted to the machine having
  the cylinders being controlled for sequential operation, while as much DDV pumps as that of cylinders needs
  be installed to the machine with the cylinders for parallel operation.By this new DDV-control system being
  implemented, an existing production equipment is dressed to the one of the latest version

  Application to a new machine with size-, energy-, and accuracy-oriented design
  Conventional AC servo drive +ball screw can be replaced by DDV pump + hydraulic cylinder.
  By this implementation, the instantaneous operation torque rises three times as high for several seconds,
  which would be ideal for instantaneous-power required press-work.
  Further advantage is mechanical machine failure will be substantially reduced thanks to the shock-absorbing
  performance by the hydraulic cylinder.

  NC Pipe bender with servo-valve that is replaced by DDV system
  For accuracy-oriented work, low heat generating DDV pump is ideal to replace accuracy-needed boosters
  for power supply and pressure-die that needs be eased from heavily influence by large hydraulic temperature
  variation through morning and day time.

⑤Cost
 
 Conventional idea has been like employment of many single purposed magnetic valves, complicated distribution
 system to control cylinders. Now with DDV pump available in the market, AC servo drive will only control
 a reversible  hydraulic pump for the total cylinder control. No large-sized tank, magnetic valves nor distribution
 system needed,  which is a big cost cutting.More than standard cost cut should be stressed for the machine
 with several cylinders  on sequential control, while the machine with the cylinder on parallel control. remaining
 standard in terms of the cost.

3)Packaging of DDV pack/DDV pump and controller unit

  This is a cost oriented version of DDV Hydraulic Servo Pump and NC unit combined.
  With this DDV pack being once employed, general purposed hydraulic machinery currently in service are easily
  upgraded to that of NC version and/or new designed NC machinery are also of easy access with supporting team
  from Opton.

4)Typical machine model with successful installation of DDV hydraulic servo system

  The machine of Opton brand
  ＣＮＣ Pipe Benders, CNC Hammering Hydroformer, CNC Multi Bender,  CNC Stretching Benders

Installation of DDV Hydraulic Servo pump to the production equipment by client's make

Opton has ever delivered this package as many as about 1000 units to be installed to various types of
machinery that clients have made out of their own design. The machinery include press machine,
powder press-molding machine, insertion machine, press-brake, injection molding machine, tire-inflator,
tire-wheel caulking machine, spinning machine, blow-forming machine, sheet-spring press machine,
sheet-spring conveyor line.Press-die cushion, casting-gate controller, rolling machine, roll former,
rolling machine for paper production, end-former,press-cutter,film winder, bulge former, tube expander etc.

Table A-1 ＤＤＶ Hydraulic Servo Pump Selection Guide_Table-2 Cylinder-driven DDV Servo Pump Selection Guide.pdf