Does Injection molding machines with Accumulators in Injection or clamping side have any advantage over conventional machine?

The idea with accumulators is that you will be able to generate much higher oil flow over a short period of time and thereby allow you to move the machine parts very fast e.g. handy if you need extreme fast filling of you mould...
On some machines the accumulators are just added to compensate for a small pump.

Thanks Mr Sommer. I am also told that these accumulators are energy efficient also. But are they worth the price manufacturers are demanding? Can you inform the names of some reputed manufacturer making such machines with accumulators?

Given the right conditions, they will save you some energy. I only know this technology from very big machines (1200 T) and judging from the amount of steel and valves in these systems I do not question that it is a expensive affair (investing in the machines was not my headache at the time). It is some year ago I have been on your side of the table (now I am the annoying customer), so I do not have that kind of feeling with the industry any more.

If it is a question of getting lower energy use, I think that you should ask the machine suppliers for documentation for the savings (in production) achieved with their accumulators. If you have a project on hand, they can base their calculations on that. If it is a question about obtaining higher injection speed you really do not have a choice…

As stated earlier the accumulator(s) can save energy under the certain conditions as it is an energy storage device. This means it store the pressurized oil until needed. This is most commonly used to produce parallel motions [such as core actions with clamp movement as an example] and to produce high flow rates for high speed injection. The later being the most common use today. Servo driven pumps or E machines are more energy conservative

As Peter said accumulators provide fast cycles, check for BMB machines they are large injection molding machines, the pneumatic accumulators guarantees constant circuit pressure during all the functioning phases, high and constant velocit, regulated pressure, absorption of peaks for longer duration of hydraulic components and allow the use of oil necessary for peak requirements. they have hydraulic machines, full electric machines and hybrid machines.

I go With Pete but have ad somethings. Next to faster movement you can also do several moves ad the same time. in Princeple the accumulator cost more energie. but in used to save on the pump you may gain some. to save energie it is i think better to go for electric or hybride machines.they cost more than normal machine so your saving on energie is strongly depending on the energie preis.
suppliers that make these kinds of machnes are Klockner, Krauss, Engel, some Japaneese suppliers and othersits al depending of what your in to.

Raj,The short answer to your question is YES: the accumulator based system is more efficient presuming that “conventional machine” is one that does exactly the same functions without accumulators (apples to apples).The “conventional machines” costs less but use more energy to run. Capital investment vs running costs dilema.
The oil requirement during injection cycle varies significantly (zero during cooling). Conventional machines would have a constant volume pump (less expensive) and if the pump is sized for the highest oil requirement (fast injection), during lower oil need, the pump will dump to the tank the excess oil, creating a lot of heat = loss of energy = loss of $$.Accumulators allow sizing the pump to a medium oil need and when it drops below it, the pump will fill-up the accumulators and when it goes above it, the accumulator will provide that stored oil. Some "conventional machines" have more pumps, with diferent volums for diferent times in the cycle. That also adds cost in hardware and complicates the controls.
Modern systems have variable displacement pumps which accommodate to the oil need during cycle and like Peter says, even such system may require accumulators for a very fast injection speed.
Peter is also right in saying to have the supplier justify one way or the other for your specific application . I know Husky does that.