Before operating, the travel operation is run for three-time start-up and shut-down (in cold weather, the idle operation shall be required for oil pump for three minutes).
It is necessary to check the button, switches and valves are flexible and reliable. Not only until the pressure is normal in hydraulic system and the guild rail of mould frame is moved on the column, it is permitted to operate.
The end surface of steel bar should be flat. The center of pressed workpiece and the center of piston should be aligned.
It is necessary to be familiar with the control and application of positioning devices and the pressure for a variety of steel bar in end upset. The allowance tolerance of pressure is not more than ±1MPa of the specified pressure. It is ensured that the quality is accepted.
When the large and long workpiece is extruded, center rest shall be used to prevent the workpiece from deformation and avoid overturning when it is loosen.
In operation, it is necessary often to check that four column nuts are firmly fastened. If they are loose, they are fastened immediately. If the machine swings when it operates, it is necessary to shut down for check.
If the piston of cylinder shakes or the oil pump squeals, the air existing must be vented.
It is necessary often to check oil tank and oil level. It is prohibited for oil to be overflowed.
It is necessary to keep the hydraulic oil in better quality. The oil temperature is not surpass45℃.
When the operating valve or relief valve fails or the safety device is not perfected, the machine does not operate. Once the governing valve and pressure gauge are adjusted and locked with lock nut, it is prohibited for other persons to adjust them again.
When upgradeing cylinder, if the pressure is too high, it is necessary to check or adjust the spill valve. Don’t operate until the failure is removed.
After every 15 workpieces are extruded, the cuttings, remained in the holding rack (female mould) in extrusion of steel bar, must be removed with a special tool.
The operator must carry out the visual inspection for the finished end. If it is not qualified, it should be reworked. When it is reworked, the old upset end should be cut off and the end of it shall be upset again. It is not permitted secondly to upset the end of steel bar with the upset end.
Before shut-down, the mould should be in open status. The shut-down procedure is shown as follows: At first release the working oil pressure, and then switch off the control power supply and finally cut off the master power supply.
After working, it is necessary to clean the machine and sweep the working site to keep clean and tidy, fill in the operation record for relief of a shift.
To take care of the machine that you operate is the obligation of every operator. |
