Installation and adjustment of the die must be very careful. Because the die, especially the large and medium-sized die, is not only expensive, but also difficult to move in large and small quantities. The safety of the human body should always be in the first place. The die with infinite position device should have a pad board between the upper and lower dies.
Solution to the First Big Die Maintenance-Attention Before Punch Use
Clean the punch with a clean cloth.
(2) Check whether there are scratches or dents on the surface. If yes, remove with oil stone.
3. Oil and rust prevention in time.
(4) Be careful not to tilt the punch when installing it. Use soft material tools such as nylon hammer to tap it gently. Only after the punch is positioned correctly can the bolt be tightened.
The Second Solution of Die Maintenance-Installation and Debugging of Die
Special care must be taken to install and adjust the die. Because the die, especially the large and medium-sized die, is not only expensive, but also difficult to move with large weight and trace amount, so the safety of the human body should always be put in the first place. A mattress board should be added between the upper and lower dies of the punching die with infinite position device. After the punch table is cleaned up, the die to be tested in the closing state is placed in the proper position on the table surface. According to the process documents and die design requirements, the selected press slider stroke is adjusted to the position of the lower dead point before the die is moved to the stage and is larger than the closing height of the die 10-15 mm. The slider connecting rod is adjusted and the die is moved to ensure that the die handle is aligned with the hole of the die handle and reaches the appropriate height of the die. Generally, the blanking die first fixes the lower die (not tightening) and then fixes the upper die (tightening). The suitable torque wrench should be used to tighten the T-type bolts of the pressing plate to ensure that the same bolt has a consistent and ideal pre-tightening force. It can effectively prevent manual tightening of threads due to physical strength, gender, hand feeling errors caused by the pre-tightening force is too large or too small, the same thread pre-tightening force is unequal, resulting in the stamping process of upper and lower die displacement, gap changes, gnawing and peeling edge and other faults.
Before the die test, lubricate the die completely and prepare the normal material for production. Start the die 3-5 times in empty stroke to confirm the normal operation of the die and then try again. Adjust and control the depth of the punch into the die, check and verify the performance and operation flexibility of the mechanism and device such as die guide, feeding, pushing, side pressure and elastic pressure, and then adjust properly to achieve the best technical state. Three, five and ten large and medium-sized stamping dies were tested respectively for initial inspection after shutdown, and 10, 15 and 30 for re-inspection after passing the test. Only after marking, punching and burr inspection, all dimensions and shape and position accuracy meet the requirements of the drawings, can the production be delivered.
The Third Solution of Die Maintenance-Stamping Burr
(1) Mould clearance is too large or uneven, and the mould clearance is readjusted.
(2) If the material and heat treatment of the die are improper, the upside-down cone of the die or the edge of the die is not sharp, the material should be selected reasonably and the working part of the die should be made of cemented carbide, and the heat treatment method should be reasonable.
(3) Stamping wear, grinding punch or insert.
(4) Punch into the die too deep, adjust the depth of the punch into the die.
_. The guide structure is not precise or the operation is inappropriate. The guide sleeve of the guide pillar and the guide precision of the punch are overhauled, and the operation of the punch is standardized.
The Fourth Solution to the Maintenance of Dies and Moulds - Scrap Jumping
Large die clearance, short punch, material effect (hard and brittle), high stamping speed, sticky stamping oil or oil droplets caused by too fast adhesion, stamping vibration to produce chip divergence, vacuum adsorption and inadequate core demagnetization can cause waste chips to be brought to the surface of the die.
The sharpness of the edge. The bigger the roundness of the edge, the easier it is to cause the scrap rebound. For stainless steel with thinner material, inclined edge can be used.
(2) For the more regular waste, the complexity of the waste can be increased or the polyurethane ejector can be added to the punch to prevent the waste from jumping, and scratches can be added to the edge of the concave die.
(3) Whether the clearance of the die is reasonable. The unreasonable die clearance is easy to cause scrap rebound, for small diameter hole clearance reduced by 10%, diameter greater than 50.00 mm, gap enlargement.
(4) Increase the depth of injection. The requirement of input modulus is certain when stamping the die at each working station. The input modulus is small, which can easily cause scrap rebound.
(5) Whether there is oil stain on the surface of the material being processed.
_. Adjust the stamping speed and the concentration of stamping oil.
_. Vacuum adsorption.
(5) Demagnetization of punches, inserts and materials.
