What are the common faults of tin can lid end making machine? How to deal with them?

Common faults and treatment methods of tin can lid end making machine
As one of the important equipment in the metal packaging industry, the tin can lid end making machine is widely used in the cover end forming and stamping manufacturing of tinplate products such as food cans and chemical cans. Its operation process involves multiple processes such as feeding, positioning, stamping, and trimming, which have high requirements for equipment stability and mold accuracy. In the long-term operation process, some faults that affect production capacity and finished product quality often occur.

Poor feeding or material jamming
Fault manifestation:
During the operation of the equipment, the feeding of the material is intermittently paused, and even the raw material is stuck in the feeding track or mold area, causing the machine to be unable to continue to run.
Possible reasons:
*The feeding mechanism is loose or there is foreign matter accumulated on the track;
*The feeding pulley is worn and the friction is insufficient;
*The raw material burrs, deformation or specification deviation is too large, resulting in jamming;
*Sensor failure, resulting in a disordered feeding rhythm.
Treatment method:
* Check and clean the feeding track, remove burrs or foreign matter;
* Replace the worn feeding wheel or adjust the spring pressure;
* Check whether the raw materials are qualified and replace the batch if necessary;
* Calibrate the feeding sensor or replace the damaged sensor element.

Incomplete stamping or deformation of the finished product
Fault manifestation:
The contour of the cover end after stamping is incomplete, the size deviation is large, and even cracks, indentations or warping deformation appear on the edge.
Possible reasons:
* The upper and lower molds are not aligned correctly and there are deviations;
* The mold is seriously worn and the gap exceeds the limit;
* The stamping pressure is not set enough or the hydraulic system is unstable;
* The material thickness is uneven or the hardness is high.
Treatment method:
* Adjust the mold position to ensure the centering accuracy of the upper and lower molds;
* Repair the mold or replace the aging module;
* Check the oil volume and pressure value of the hydraulic system to eliminate oil leakage or blockage problems;
* Replace the raw materials that meet the process requirements.

Dimensional deviation or eccentricity of the cap end
Fault manifestation:
The diameter, roundness or center hole position of the stamped cap end deviates and cannot be accurately matched with the tank body.
Possible causes:
*The tooling fixture is loose and the material positioning is unstable;
*The mold installation angle is incorrect or the guide column fails;
*The stamping stroke setting is unreasonable.
Handling method:
*Reinforce the fixture and regularly check the positioning device;
*Check the wear of the guide column and guide sleeve and replace them in time;
*Adjust the stroke height and step length according to the process parameters.

The mold has a short service life or is frequently damaged
Fault manifestation:
The mold wears too fast during use, and cracks, corner collapse or gap deviation problems frequently occur.
Possible causes:
*The mold material or heat treatment process is not up to standard;
*The stamping load exceeds the design range;
*Insufficient lubrication causes dry grinding or overheating of the mold.
Handling method:
*Use high-strength and wear-resistant mold materials and ensure the correct heat treatment process;
*Control the stamping pressure and frequency within a reasonable range;
*Regularly add lubricating oil or lubricating sheets to prevent dry running of the mold.

Abnormality of the electric control system or automatic shutdown of the equipment
Fault manifestation:
The control panel cannot respond normally, the machine suddenly stops during operation, or the alarm prompt appears frequently.
Possible causes:
*PLC module failure or program disorder;
*Loose wiring or circuit aging and short circuit;
*Abnormal sensor signal or poor contact.
Handling method:
*Restart the PLC system and perform fault code analysis;
*Check whether the electrical connectors and lines are firm, and replace the aging cables if necessary;
*Replace the failed sensor or calibrate the sensing parameters.

Abnormal stacking or transportation of finished products
Fault manifestation:
The cover end after stamping is flipped, blocked, or dropped during stacking or transportation.
Possible causes:
*Conveyor belt deviation or uneven speed;
*Disordered rhythm of the pusher mechanism;
*Insufficient gripping force of the mechanical arm suction cup or mechanical gripper.
Handling method:
*Adjust the tension of the conveyor belt and re-center the guide wheel;
*Synchronize the pusher and stacking units;
*Check the air pressure system, increase the suction force or replace the worn suction head.

Equipment vibration or abnormal noise
Fault manifestation:
During the operation of the equipment, there is obvious mechanical vibration or abnormal metal impact sound.
Possible causes:
*Bearing damage or poor lubrication;
*Loose coupling, poor gear meshing;
*Loose rack foundation or loose installation.
Solution:
*Check and replace faulty bearings, add lubricating grease;
*Check gear clearance and re-tighten coupling;
*Reinforce anchor bolts to ensure equipment stability.