Many customers ask about the maintenance details of the hot runner system

Many customers ask about the maintenance details of the hot runner system

Many customers have asked about the maintenance details of the hot runner system, Tengsheng precision hot runner today to talk with you about some precautions and details of the usual maintenance of the hot runner system.

1. Maintenance of discharge board

Disassembly method of discharge plate:

Can first use two screwdriver balance pry up, and then use both hands to balance the force out.

Disassembly reason analysis:

Find out the cause and then do the corresponding treatment, must not blindly dispose. In case of disassembly difficulties, it should be checked whether the mold is cleaned, whether the locking screws are all removed, and whether the mold damage caused by the card material should be caused.

Points for assembly after disassembly:

When loading and unloading plates, clean the punch and discharge plate first, add lubricating oil to the guide post and punch entry, place it smoothly, and press it into place with both hands, and repeat several times. If it is too tight, the cause should be identified (whether the guide column and guide sleeve are normal, whether there is damage to various parts, whether the new punch can smoothly pass the discharge plate position is correct), and then the corresponding treatment should be found out the cause.

If the fixed plate has a pressing block, check whether the stolen material on the discharge backboard is enough. The material contact surface between the discharge plate and the concave die produces indentation after a long time of stamping (the material gap between the discharge plate and the concave die is generally 0.03-0.05mm;

The equiheight sleeve should be checked for accuracy. If it is not high enough, it will cause the discharge plate to tilt, and its precision guidance and smooth pressure function will be destroyed.

When the indentation is serious, it will affect the pressing accuracy of the material, resulting in abnormal product size and instability, and it is necessary to repair or re-grinding the discharge insert and discharge plate. It must be maintained.

2, mold clearance adjustment

When the gap is large, the cross section is more and the raw edge is larger, the gap is small, the cross section is less, and the reasonable gap is obtained by shifting. After adjustment, appropriate records should be made, and marks can also be made on the edge of the concave die for subsequent maintenance operations.

Die core positioning hole due to frequent and multiple combination of die core and wear, resulting in large gap after assembly (loose after assembly) or uneven gap (positioning deviation), will cause the shape of the section after punching is bad, punch is easy to break, resulting in burr, etc., you can check the section condition after hedge cutting, make appropriate gap adjustment.

Daily production should pay attention to the collection and preservation of the original mold in the best condition of the material belt, such as subsequent production is not smooth or mold variation, can be used as a reference for mold maintenance. In addition, the auxiliary system, such as whether the top pin is worn, whether it can be topped, whether the guide nail and the bushing are worn, should pay attention to check and maintain.

3. Guide part inspection

The wear and tear of the guide parts and the destruction of the accuracy of the mold reduce the accuracy of the mold, and the various parts of the mold will have problems, so it must be properly maintained and replaced regularly.

How is the clearance between the guide post and the guide sleeve, whether there are burn or wear marks, and whether the oil feeding state of the mold guide is normal should be checked.

Check the condition of the spring (discharge spring and top spring, etc.) to see whether it is broken, or although it has not been broken for a long time, it has lost the original strength of fatigue, must be regularly maintained and replaced, check the accuracy of the guide parts, if the guide nail is worn, it has lost the correct accuracy and function of the material guide, and must be replaced. Otherwise, it will cause damage to the mold or the production is not smooth.

4, mold maintenance

Replace the punch to test whether the discharge block and the die are smooth, and test whether the gap between the insert and the die is uniform, and replace the die to test whether the gap between the insert and the punch is uniform.

When disassembling the mold, attention should be paid to the original condition of the mold, so as to facilitate recovery during subsequent mold installation. The thickness of the gasket should be engraved on the part and recorded if it is padded or shifted.

The effective length of the punch should be checked whether the effective length of the punch is enough when the rear punch becomes short after the grinding punch. Replace the broken punch to find out the cause, and check whether the corresponding die has a broken edge, whether it needs to grind the cutting edge.

After installation, check whether the concave die surface is flat with the die surface, assemble the punch to check whether the gap between the punch and the fixed block or the fixed plate is enough, and check whether there is an active margin for the pressing block. The assembly die should be placed horizontally, and then the flat iron block is placed on the surface of the die with a copper rod to tap it into place, and it must not be tilted and hammered into the bottom of the die.

After the assembly of the punch die and the die core, it is necessary to check the care belt, whether the parts are installed incorrectly or incorrectly, check whether the die and the die pad are installed incorrectly, whether the blanking hole is blocked, whether the new parts need to steal material, whether the material needs to be stolen is enough, and whether the mold needs to be locked.

Pay attention to the stripper screw locking confirmation, locking should be from the inside to the outside, balance force cross-locking, do not lock a screw and then lock another screw, so as to avoid the stripper tilt resulting in punch fracture or mold accuracy reduction.

These are the four big points about the maintenance of the hot runner system, and they are also the places where problems often occur, usually pay attention, if there is a problem, you can find Tengsheng precision hot runner after-sales department, we will help you deal with these problems in the first time.