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What should I do when the powder hydraulic press works slowly?

by:WORLD     2022-08-31
What should I do when the powder hydraulic press works slowly?

What should I do if the working speed of the powder hydraulic press is very slow? It is deliberately constrained during the design, but it still cannot be achieved? Why? The hydroforming process of the powder hydraulic press is widely used in the automobile, aviation, aerospace and pipeline industries. Circular, rectangular or special-shaped hollow structural parts with a changed axis, such as special-shaped pipe fittings for the exhaust system of automobiles; non-circular cross-sectional hollow structures, such as engine brackets, instrument panel brackets, body structures (about 11% to 15% of the mass of the car) %); hollow shaft parts and messy pipe fittings, etc.







The running speed of the powder hydraulic press is determined by the working flow rate. The power of the hydraulic pump is proportional to the product of the working pressure and the flow rate, that is, the pump power = P*Q. When the powder hydraulic press returns, the powder hydraulic press load is small, and the working pressure Low, so the flow can be increased without exceeding the output power of the hydraulic pump, that is, the running speed of the powder hydraulic press can be increased. When the powder hydraulic press is working, the powder hydraulic press has a large load and high operating pressure. Therefore, it is necessary to ensure that the hydraulic pump is not overloaded and the flow rate drops, which reduces the working speed of the powder hydraulic press. In a word, to ensure that the hydraulic pump (pump motor) is not overloaded, the flow rate is low when the pressure is high, and the flow rate can be high when the pressure is low. The running speed of the powder hydraulic press is only related to the flow rate, that is, the flow rate is large and the speed is fast. The flow is small and the speed is slow.





We all know that powder hydraulic presses can be used for forming, stretching, shaping, straightening, etc., and hydraulic oil is used to transmit energy, so there will be some vibration during operation. Some friends have misunderstandings in their understanding, thinking that the tonnage is small and small The powder hydraulic press has a lot of vibration, but the large and heavy powder hydraulic press itself will not vibrate due to its heavy tonnage. This is wrong. Today, let's talk about how to correct shock absorption.








Because the liquid storage in the working cylinder of the powder hydraulic press is large, the sudden release will cause vibration, and the backing plate can be thickened on the working table to reduce the storage capacity of the elastic compression energy of the liquid in the working cylinder, which can reduce the vibration. A backing plate of a certain thickness is installed between the molds, and the working stroke of the moving beam is moved upward to reduce the volume of the upper cavity of the working cylinder when the load is suddenly lost, which also reduces the amount of stored liquid elastic energy in a disguised form. Install a one-way throttle valve on the hydraulic control oil circuit of the valve, adjust the clearance of the throttle valve to control the hydraulic control flow, lower the movement speed of the control piston, increase the opening time of the main valve of the hydraulic control one-way valve, and open the main valve first. The small unloading valve on the core opens the main valve again, and the impact and vibration can be eliminated only by extending the pressure relief time; the working cylinder and the plunger are evenly divided into upper and lower sections by using a series plunger, and the upper and lower plungers are up and down when the idle stroke is downward. Descend together with the moving beam. After touching the workpiece, the oil discharge port of the upper cylinder will be closed. The upper chamber of the lower cylinder enters the pressure oil and the lower chamber discharges oil, and pushes the plunger and the moving beam to press down together. When the load is suddenly lost, the upper cylinder plunger remains stationary. , The plunger in the lower cavity is excited downward, the stroke of the plunger of the hydraulic press does not require a lot of energy, and the volume of the upper cavity of the lower cylinder is relatively small, so the elasticity of the liquid stored in the powder hydraulic press is relatively small, which reduces the impact vibration.





To prevent the overload operation of the powder hydraulic press, increase the smoothness according to the rules before each startup, check whether the high-pressure pump, pressure gauge, sealing ring and various valves are normal. Eccentric use, after each pressure test, the inspection is qualified before mass production, and the powder hydraulic press workshop and the surrounding environment are regularly cleaned.

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