1. Remove the front workbench plate, front support arm and shroud
As shown below:
2. Blade removal
(1) When disassembling, remove the blade first, leaving a bolt in the middle of the blade only to loosen it and not remove it, so as to prevent the blade from falling and injuring people.
When all the bolts are removed, two people should take out the lower blade (two bolts can be screwed on the blade for two people to lift)
② Set to “Manual Shift Mode” on the operation panel (This mode can only be performed in stop mode), as shown in the figure.
- Backgauge distance over 900
- Change upper blade shear angle to 0.5° (the greater the angle, the greater the tilt of the upper blade)
- Upper and lower blade clearance changed to 0.5 or more (to prevent the loading of upper and lower blades from bumping each other)
3. Removal of the upper blade
When removing, the middle bolt is only loosened but not removed, then the pressure reducing valve inside the unit is loosened (counterclockwise), as shown below.
The greater the counterclockwise amplitude, the faster the upper blade will drop.
When the upper blade is lowered enough to see the two hidden bolts, close the pressure reducing valve (clockwise to the end) and you can remove the two hidden bolts in the upper blade.
When the upper blade is lowered enough and the operator is able to see the two hidden bolts, close the pressure reducing valve (clockwise to the end) and you can remove the two hidden bolts in the upper blade.
After removing these two bolts, start the unit oil pump and the upper blade returns to the dead spot to remove the upper blade (The upper blade can be tilted at a larger angle for easy removal).
When dismantling, multiple people must work together to prevent injury by using a wooden board in the middle.
4. Clean up oil, dust and dirt from upper and lower blades
Inspect the tool for damage, mark the available surface and prepare it for installation.
5. Blade installation
The installation step is the opposite of the removal step.
Install the blade first, using two bolts to secure it slightly, so it’s easy for two people to carry it.
Attach the bolt to the device and then install the lower blade (Until you can’t screw it on; The hidden bolts on both sides of the upper blade don’t need to be installed first.).
Finally, in the operation panel, adjust to the “Manual shift mode”, set the value as follows:
Backgauge: 900+, shear angle 1.7° (>1.5°), clearance 0.5 (to prevent bumping of the upper and lower blades when mounting).
6. Upper and lower blade fixation
One person must always be in control of the pressure reducing valve when fixed.
The upper blade must descend slowly, and close the pressure reducing valve when the upper and lower blades immediately overlap.
Use a plug ruler to try the clearance of the upper and lower blades, normally a 0.5mm plug ruler will pass (as the clearance is set to 0.5mm).
If the gap is too small (e.g. 0.1 or 0.2) the gap must be changed again in the “Manual Shift Mode”.
If there is no problem with the clearance and the top and bottom are not bumped, continue to release the pressure reducing valve.
Close the pressure reducing valve again (clockwise) when the upper blade immediately touches the lower blade on the far right side, and use the plug ruler again to measure the clearance to prevent the upper and lower blades from bumping due to too little clearance.
Start the oil pump to bring the upper blade ram up to the dead center position, use a wooden plank to hold it between the upper and lower blades, and slowly release the pressure reducing valve.
When the upper and lower blades are sufficiently tightened, tighten the nearby bolts, using the same method, one by one, from left to right.
After all the bolts are tightened, dropping the upper blade, tighten the last two hidden bolts (shorter in length).
7. Gap correction
Use a plug ruler on both sides of the upper and lower blades to make corrections and see if the clearance matches what the machine shows.
If inconsistencies require adjustment, adjust as follows.
(1) Two persons are required to use a live wrench, one to fix the hexagonal bar and one to loosen the nuts on both ends of the bar, as shown in the picture.
Send the nuts at each end to the top, then use a wrench to turn the hex bar (adjusting lever). Rotating the screw clockwise reduces the clearance and rotating the screw counterclockwise increases the clearance (depending on the site).
(2) Use this method to adjust the gap on both sides. The clearance needs to be adjusted to match the machine display and the upper and lower tool sides must also match in order to tighten the nuts on both ends of the screw.
8. Once the gap has been adjusted, it is necessary to verify the correct distance of the backgauge
If an error requires adjustment, adjust as follows.
① Move the backstop to the back (the machine shows the number 900mm), loosen the nut “A” and then loosen the nut “C”, use a wrench to twist the letter “B” (adjusting screw), the size of one turn is about 2.3mm (clockwise to reduce, counterclockwise to enlarge)
② After the backstop adjustment is completed, tighten nut “A” first and then tighten nut “C”, and check the adjustment accuracy through the shearing plate until the test piece passes!