What are the reasons why the hydraulic press machine does not return?

The return stroke of a hydraulic press machine is the process by which the piston of a hydraulic cylinder is pulled from the lower stop (working position) back to the upper stop (initial position) by the action of the hydraulic system after the completion of the working stroke. This process is an important part of the working cycle of a hydraulic press machine, ensuring that the machine is ready for the next working cycle. In the use of hydraulic press machine, sometimes do not return to the problem, the operation of the equipment and production efficiency to produce a variety of negative impacts. So what are the reasons for the hydraulic press machine not to return?

1.Hydraulic system problems

(1) Oil line blockage: the hydraulic machine’s drain or return port may be blocked by debris, resulting in the liquid can not return to the tank, so that the oil pressure rises, and then can not be normal return.

(2) Hydraulic component failure

① Solenoid valve failure: return into the oil solenoid valve or return back to the oil solenoid valve is dead, jammed or plug-in jammed, will lead to return to the oil circuit is not available.

② Relief valve failure: control pressure relief valve solenoid valve is not electric, supply pressure oil, will lead to no pressure on the return.

③ Liquid filling valve failure: press the return, the press can not return, but the system will build pressure, may be the liquid filling valve is not open.

④ Hydraulic pump failure: the hydraulic pump is clogged or worn out, and cannot produce enough hydraulic press machine, resulting in insufficient power on the return stroke.

(3) Hydraulic oil problems

① Abnormal oil temperature: hydraulic oil temperature is too high or too low, will affect the viscosity and fluidity of the hydraulic oil, resulting in the hydraulic system can not work properly.

② Oil contamination: impurities in the hydraulic oil, may lead to blockage of the oil circuit or hydraulic components wear, affecting the return trip.

③ Insufficient oil: insufficient hydraulic oil to meet the oil volume required for normal operation of the hydraulic system, resulting in insufficient pressure during the return trip.

2.Mechanical components problems

(1) Cylinder failure

① Damaged piston seal: The piston seal is damaged, resulting in leakage inside the cylinder and failure to generate sufficient return force.

② Piston rod deformation or bending: piston rod deformation or bending, will lead to the cylinder movement is not smooth, or even jammed, can not return.

③ Cylinder cylinder strain or wear: cylinder cylinder wall strain or wear, will affect the cylinder sealing and movement performance, resulting in return difficulties.

(2) Failure of other mechanical parts

① Press head stagnation or deformation: press head stagnation, deformation or wear and other problems, will affect the normal return of the hydraulic press machine.

② Guide bar problem: guide bar swing, fracture or deformation and other problems, may lead to the hydraulic press machine movement is not smooth, affecting the return stroke.

3.Electrical system problems

(1) Limit switch failure: the upper and lower limit switches of the hydraulic press machine are out of order or damaged, which may result in the cylinder not being able to return properly.

(2) Relay failure: pressure relay is damaged or improperly set, may lead to the hydraulic press machine can not reach the set pressure, and thus can not return.

(3) Solenoid or motor failure: incorrect installation of the solenoid, motor phase wire connection error, etc., may lead to the hydraulic components can not work properly, affecting the return trip.

4.Operation and process problems

(1) Mold bite force is too large: mold bite force is greater than the return force, may lead to the hydraulic machine can not be normal return. At this time, you can loosen the mold and slide connection screws, so that the slide alone return.

(2) Operating mode error: If the hydraulic press machine is in automatic mode, the pressure may not reach the set value, resulting in non-return; if it is a manual mode, it may be the return of the oil circuit problems.

Shanghai ANTISHICNC is a professional manufacturer of hydraulic press machine. The hydraulic press machine designed and manufactured by Shanghai ANTISHICNC have advanced and mature technology in the industries of composite molding, stamping and stretching, powder molding, etc. The hydraulic press machine designed and manufactured by Shanghai ANTISHICNC are popular among customers for their high precision, high productivity and long service life. Shanghai Anticipation’s hydraulic press machine are popular among customers for their high precision, high productivity and long service life. For example, the following 1000 tons of four-column hydraulic press machine.

The 1000-ton four-column hydraulic press machine consists of main machine, hydraulic system and electric control system. The main cylinder adopts piston cylinder structure, which is bolted to the center hole of the upper crossbeam. The cylinder body is rolled, the piston rod is tempered, and the surface is hard chrome plated and polished, which is wear-resistant, beautiful and corrosion-resistant. The machine has two operation modes, manual and semi-automatic, with the function of holding pressure delay.

Remark: The above parameters are for reference only, the actual parameters of the machine please refer to the technical program of Shanghai ANTISHICNC.

If you have hydraulic press machine needs too, welcome to consult Shanghai ANTS Machine Equipment co., ltd. We have rich experience in manufacturing and using hydraulic press machine and can provide you with professional technical support.

Keywords: Hydraulic press machine, Four-column hydraulic press machine, Three-beam four-column hydraulic press machine, Frame hydraulic press machine