Flat die-cutter operation and its technical defects and adjustments
1.Cautions for die-cutter testingBite adjustmentTake out the rolled cardboard to adjust the bite, when the edge of the die to the first rolling edge is about 16 mm, and the front baffle on both sides of the handle is adjusted to the minimum, the bite is at least 8-12 mm.Adjust the scrap die●The gap between the upper die and the lower die shall be 4mm, be the same on both side.●Low speed operation equipment, rolling cut out a piece of cardboard.●Turn on the scrap setting switch and press the button until the cardboard arrives.●Align the upper die with the crossbolt of the cardboard●Lower the die frame so that it is targeted on the cardboard, and then to the lowest point.First piece inspectionIt is important to note that the the mold frame can be pulled out when the equipment operating angle between 170-240 degrees, and the steel plate can be pulled out between 170-190 degrees.●Press the button to fix the mold frame, pull out the mold frame and push out the center bolt of the mold lock frame.●Open two plastic sheets and hold the fiber tape for reinforcement.●Adjust the rolling pressure so that the degree of cardboard cut to 70%, 30% of that will be filled by fiber tape.●Check whether there is break phenomenon, if not broken, with fiber tape in the reinforcement diagram above.●Check that whether the scoring line is good, if the scoring line is not obvious, with the fiber tape on the scoring line of the appropriate map.●Use a tape measure to measure the dimensions of the rolled semi - finished products.●Measure the length, width and height of the semi-finished product to see if it is consistent with the size of the order drawing.●Put down two plastic plates, pull out the clamping frame and push into the machine, press the clamping frame and holder button.●Then feed another piece of cardboard, press the alarm to start the machine, and then roll the cardboard and test repeatedly, until where the cutting point completely broken.●Start the main engine motor on the main control panel of the paper feeding department, and make it run in the debugging state. When adjusting the machine, the speed is generally 1600 pieces/hour, not too fast.2.Cautions for die - cutter batch productionChief conductor's work itemIn mass production, we need to pay attention to the mold, electrical eye, quality, sound, preparation. Firstly, the mold should be reinforced at any time. In fact, the electrical eye is easily blocked by dust, once blocked the machine will stop. So it is very important to clean the eyes. Secondly, the quality is likely to be involved in many problems like the scoring cracks, or carrying dust. Then die cutting pressure can generally reach several hundred tons, the highest can reach 350 tons, so in this case, we should pay attention to whether there is abnormal sound of the machine, if there is abnormal sound, it is easy to damage the equipment. Finally, the preparation should be careful and cautious.Paper feeding operatorsAt the time of mass production, we should note that, the cardboard should not be set too high, generally, AB flute is less than 50, A flute is less than 50-80, B flute is less than 100-120, this is a relatively reasonable paper stack. In addition, cardboard must be close to the center of the baffle, the baffle on both sides of gate and rear baffle to be stacked neatly.Paper delivery operatorsWhen the cardboard into the machine, the connecting rod will send the rolled cardboard to the splicing unit, we should always observe whether the connecting rod is normal. After the cardboard is pressed through the connecting rod, the paper falls on the guide rod of the connecting cylinder, and is put on the conveyor belt by counting the number of electric eyes, and the product is output by the conveyor belt.Notes after the mass productionAfter mass production, we need to remove the die and filling map.Remove the die: Open the window of the die unit, loosen the fixed switch of the die, the red light is on, pull out the die, remove the die and put it back on the die frame.Remove the filling map: Push out the fixing screws on both sides of the knife mold holder, clamp the knife mold holder and rotate it 360 degrees. Open the plastic sheet and take out the filling map and put it back on the filling map holder.The quality of the product is determined by the supplementary drawing and the die. If there is no supplementary drawing, the supplementary drawing can not be adjusted for at least an hour. This is an important factor why the efficiency in many companies is not high.3.Die - cutting technical defects and adjustments The reasons and solutions of scoring cracksDie - cutting process adjustment is a big problem in scoring cracks, there are six main aspects:●The scraps falling on the die plate.Solution: clean up the scraps●Paper error.Solution: The paper material is better, the scoring line should be a little lower, the paper material is bad, scoring line should be a little higher.●The flute direction factor:Solution: Because of the horizontal and vertical difference, the pressure is also different. Apply cork chips or sponges where there is a lot of stress●Blunt knife with a lot of pressure will cause scoring cracks.Solution: Replace the knife or adjust the middle scoring gap.●There is too little moisture on the paper.Solution: Wipe the scoring part with water to increase humidity●Scoring cutter is too longSolution: Replace a shorter oneHow to avoid cardboard and trimming cracks? After the knife cutting down, cardboard cracks on both side, why is that? Because the cardboard before cutting itself has a tension, when the tension broke, the cardboard was ruptured. Base paper has little water, knife and scoring line is too close, all of these will destroy the quality of cardboard and cardboard thickness. How to avoid that?The first method is to crush the edge of the cardboard. On the top of the knife, covered with batten so that it will crush the cardboard a little bit, cardboard tension at this time will get a certain buffer, which is not easy to break.The second method is that the knife line uncovers the batten, but batten should be 1.4mm higher than the knife, batten scoring should be 0.4mm-1.1mm lower than k-line so the scoring line will not crack.The edge of the flute will be crushed after the carton is rolled, paste the sponge in right place. The edge of the flute is easy to get crushed after the carton is rolled, but it can be solved to paste sponge according to different parts with different hardness.Generally speaking, the circumference of the knife inside to stick a high hardness of the sponge, so it will be easy to let the scrap flip out. If the hardness is 30℃-40℃, you can stick a lower hardness sponge on the side, say 17℃-25℃.How to keep long dimension knife edge in flat when installing wood shape knife and scoring? We will find that there is no arc in the arched part of the knife below, which will easily cause stress on this part, and the strength of the knife will be very poor. In the process of rolling, the stress part is not able to cut off, and giving rise to crack. So when you're making a knife, you have to pay attention to the arc of the knife.When the curved knife rolled into the cardboard, the height is 0.5mm-1mm, you can imagine, when the die-cutting knife pressed down, if there is no air between the cardboard and the knife, then because of the air pressure, the knife is not cut down. Therefore, only when the die-cutting knife and the cardboard has a air vent, the cardboard can be oothly pressed down. Of course, what is more important is that we must install the template along a straight line.How to reduce adding adhesive tape to the back plate in the process of production in terms of oil pressure flat roller with new dies?How do you calculate the pressure during the initial rolling? The calculation formula of the standard rolling is the circumference of the pressing knife *4 tons +30 tons. For example, the actual cutting edge circumference is 5.94 meters, rounding off to 6 meters, the pressure is 6*4+30=54 tons, which is the standard rolling pressure.It is important to note that before the new die rolling, not to add the tape on the back plate, when the rolling part is divided into 90% of full knife, 10% of non broken, then to add. Repair tape should not be more than three layers, if too thick, it will lead to the knife inaccuracy, different machine production should use different back pad. If the back plate too thick, other parts will not be cut off.How to connect the knife to the carton, and how to fix the knife with the common knife? In the template on the knife, we should pay attention to reinforcement. Because there is a seam at the knife joint, if there is no reinforcement, the paper powder is easy to jam in the gap, thus causing the displacement of the whole mold. So in this position, there's going to be a reinforcing iron.Die - rolling knife, what can be selected to avoid paper power jammed and knife turn over? There is a pull along the corrugated direction, in this case, it will produce some paper powder and turning over the knife. There are three main reasons:●The knife slide off.●When cutting to the position of the flute peak.●A blunt knife.●Rolling pressure is too high;Solution:●Put some protective iron around the edge of the slot.●Cork batten can protect the blade, it will be used when making a new mold.●Attention to the direction of the flute, that can avoid burrs and paper powder.●Reduce paper powder. Wave knife for cutting die. Wave knife can be divided into 2mm, 3mm and 4mm according to the spacing.The scrape method of the knife In the case of corrugated shape is vertical, slot type and cross type are better scrape mode.Double scoring line have better crushing effect.In terms of cardboard is easy to break, we can use double scoring line, that is, two concealed lines, so that the cardboard will be folded with a radian.Situations to folding 90° and 180° In the case of 90 ° pressure angle, the curvature of the entire cardboard will be elongated, in the case of 180° pressure angle, we need to add hardness of 45° sponge on both sides of the line to crush the cardboard. As you can see, whether the cardboard is compressed, the surface rupture degree is different, when the cardboard curve is more than 90°, close to 180°, you need to use a high hardness of the sponge, and crush the flute at the folding part as far as possible.Cork batten to prevent rough edges and sponge paste methods Prevent burr, basically use the double action of cork stripe and sponge. Generally speaking, use cork batten on one side of the knife, with sponge on the other side, use cork batten in the middle of the knife, use sponge on the side, through the different adjustment of pressure, avoid the burr.The installation method of the scrape knife of flat rolling dieThere is a problem with the knife arrangement when installing a scrape knife.The traditional mode is basically to use of horizontal installation, but because the direction of operation is vertical, the confetti is not easy to fall off in this mode. Therefore, it is recommended to use the vertical arrangement mode.
The Effect of Plate Lock Loosening and its Solution
