Loading and unloading of stamping dies for tablet presses and adjustment during tablet pressing
1. Installation of stamping dies
⑴ Installation of upper punch: Loosen the lower punch fixing screw, turn the handwheel to raise the lower punch core rod to a high position, insert the lower punch rod into the hole of the lower punch core rod (pay attention to aligning the notch slope of the lower punch rod with the lower punch fastening screw and inserting it to the bottom), and then tighten the lower punch fixing screw.
⑵ Install the lower punch: Loosen the upper punch fastening nut, insert the upper punch core rod into the hole of the upper punch core rod, insert it to the bottom, use a wrench to clamp the hexagonal lower part of the upper punch core rod, and tighten the upper punch fastening nut.
⑶ Install the middle mold: Loosen the fixing screws of the middle mold, place the middle mold flat into the hole of the middle mold platform, and at the same time punch it down into the hole of the middle mold, press it to the bottom, and then tighten the fixing screws of the middle mold. When placing the middle mold, it is important to keep it flat to avoid getting stuck when tilted and damaging the hole wall.
⑷ Rotate the handwheel by hand to slowly lower the upper punch into the middle mold hole, and observe for any collision or friction. If collision or friction occurs, loosen the fixing screws (two) of the middle mold plate, adjust the position of the fixing of the middle mold plate, so that the upper punch enters the middle mold hole, and then tighten the fixing screws of the middle mold plate. Adjust in this way until there is no collision or friction when the upper punch enters the middle mold, and then the installation is qualified.
2. Adjust the output by turning the handwheel to raise the lower punch to a high position, and observe whether the lower punch surface is aligned with the middle mold plane (whether it is high or low will affect the output). If it is not aligned, loosen the butterfly screw, loosen the gear pressure plate, and transfer the upper adjustment gear to align the lower punch surface with the middle mold plane. Then press the pressure plate back on and tighten the butterfly screw. At this point, shake the handwheel with your hand and run the empty car for more than ten revolutions. If the machine is running normally, you can add materials for pressure testing and proceed to the next step of adjustment.
3. Adjustment of filling depth (i.e. adjustment of tablet weight): Loosen the butterfly screw and loosen the gear pressure plate. Rotate the lower adjustment gear to the left to raise the lower punch rod, which reduces the filling depth (reduces the weight of the tablets). After adjustment, still press the gear teeth pressing plate and tighten the butterfly screw.
4. Adjustment of pressure (i.e. adjustment of tablet hardness): Loosen the connecting rod lock nut, rotate the upper punch rod, and turn it to the left to move the upper punch rod downwards. This increases the pressure and hardness of the pressed tablet; On the contrary, turning right will reduce pressure and lower the hardness of the pill. After adjustment, use a wrench to hold the lower hexagonal part of the punch rod, while still locking the connecting rod locking nut. At this point, the adjustment of the punching die is basically completed. Then start the motor to test more than ten pieces, check the weight, hardness, and surface smoothness of the pieces. If they are qualified, they can be put into production. During the production process, it is still necessary to check the quality of the pills at any time and make timely adjustments.
5. Dismantling of stamping dies
⑴ Disassemble the upper punch: Loosen the upper punch fastening nut to pull out the upper punch rod. If the fit is tight, use pliers to clamp the upper punch rod and pull it out, but be careful not to damage the punch edge.
⑵ Disassemble the middle mold: Loosen the fixing screws of the middle mold, unscrew the downward punch fixing screws, loosen the butterfly screws, and loosen the gear pressure plate. Adjust the gear to raise the lower punch rod by ten millimeters, gently rotate the handwheel to push out a part of the middle mold with the lower punch rod, and remove the middle mold by hand. If the middle mold fits tightly in the hole, do not forcefully rotate the handwheel hard to avoid damaging the parts. At this point, it is necessary to remove the middle mold plate and then take out the middle mold.
⑶ Disassemble the lower punch: First, unscrew the lower punch fixing screw, then turn the handwheel to raise the lower punch core rod to a high position, and you can use your hand to pull out the upper punch rod. If the fit is tight, it can be clamped with pliers (be careful not to damage the edge of the punch).
After disassembling the die, it is necessary to rotate the adjustment gear to retract the lower punch rod by about 10 millimeters. When turning the handwheel to raise the lower punch rod to a higher position, its top should not be higher than the bottom surface of the middle die table (this step should not be ignored to avoid accidents where the lower punch rod collides with the middle die when used again). Then continue to tighten the downward fixing screw.