A CNC shearing machine is a machine that uses one blade to move in a reciprocating linear motion relative to another blade to cut sheet metal. By utilizing an active upper blade and a fixed lower blade with a proper blade gap, it applies shearing force to metal sheets of various thicknesses, resulting in the fragmentation and separation of the sheets into the desired dimensions.
A high-speed shearing machine is a type of forging and pressing machinery primarily used in the metal processing industry. The product finds extensive applications in various industries such as aviation, light industry, metallurgy, chemical, construction, shipbuilding, automotive, power, electrical appliances, and decoration, providing the required machinery and complete equipment.
Long-term use and lack of maintenance can inevitably lead to some malfunctions. When encountering issues during our usage, how should we go about resolving them?
1. Can we avoid the problem of ‘banana bending' during shearing?
Regarding the shearing of sheet metal, the issue of 'banana bending' can arise when using shearing machines and, currently, it is considered unavoidable. The problem becomes more severe with thicker sheets or narrower strips. However, certain measures can be taken to reduce it, such as adding anti-distortion devices or keeping the materials separated after they have been sheared to achieve the desired result.
2. After stepping on the foot pedal switch, if the blade fails to rise and produces abnormal noises, what could be the cause?
The main reason for this issue is likely to be the material getting stuck and causing blockages on the upper and lower edges of the shearing machine. Additionally, there could be several factors contributing to this problem, such as the electromagnetic reversing valve spool being stuck or not functioning properly due to foreign objects or lack of movement during surface polishing. Another possibility is that the combination valve's various spools may not provide a proper seal due to foreign objects. Furthermore, the flow control orifices inside the combination valve might be obstructed, requiring inspection and cleaning. The slow or non-coordinated return of the upper knife frame to the upper dead point might be due to the mismatched actions between the upper knife frame and the material pressing cylinder. Additionally, insufficient nitrogen pressure in the return cylinder could also be a factor, which needs to be checked and adjusted to the rated pressure.
3. What is the basis for adjusting the blade gap in a CNC shearing machine?
A CNC shearing machine is a type of shearing machine, and when adjusting the blade gap, it should be determined and carried out based on the thickness of the material to be cut from a professional perspective. If the material thickness is between 1-3mm, the blade gap adjustment value should be set at 1-2mm. For material thicknesses ranging from 4-10mm, the blade gap adjustment value should be set at 3-5mm.
4. Why would the blade holder of a guillotine shearing machine drop down?
The return principle of a guillotine shearing machine is based on the combination of nitrogen gas and hydraulic fluid, which is controlled by a flexible electromagnetic valve to provide pressure for the return stroke. If there is a lack of nitrogen gas or hydraulic fluid inside the hydraulic cylinder, the blade holder may drop down. In such cases, it is necessary to replenish the hydraulic cylinder with nitrogen gas and hydraulic fluid to restore proper operation.
5. What causes any valve to get stuck, and how can it be resolved?
It may be due to the prolonged usage of hydraulic fluid, which might have become contaminated, or the poor quality of the oil itself. In such cases, it is recommended to change the hydraulic fluid regularly and use higher-quality oil to ensure optimal performance.
6. How to resolve the issue of high oil temperature?
Generally, hydraulic system failures, such as clogged filters, contaminated or degraded hydraulic fluid, are the common causes. In such cases, it is necessary to inspect the filters, hydraulic fluid, and other components. If required, promptly replace the clogged or damaged parts with new ones.
7. How to resolve significant blade vibration while shearing sheet metal?
It could be due to a loose connection between the slide and the hydraulic cylinder or blade edge wear. Another possibility is that the back pressure setting is too high, causing blade vibration during no-load operation. To address these issues, you need to inspect the slide connection to identify any loose spots. Next, check the extent of blade edge wear. Finally, adjust the back pressure according to the standard to effectively resolve the blade vibration problem.
8. Why can't the shear angle of the shearing machine be adjusted to increase or decrease?
There are two common situations: the first one is the failure of the shear angle control valve's control section, corresponding to PLC output points or relays malfunctioning. For this situation, the appropriate inspection and repair are needed. The second one is the failure of the shear angle control valve itself. In such cases, it is generally recommended to clean the shear angle control valve.
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