Causes And Solutions Of CNC Machining Faults

Causes and Solutions of CNC Machining Faults

The effect of the CNC machining workpiece's machining arc should not be overlooked. It is important to note that this effect can greatly impact the final product, which is why it is essential to consider it. When machining a workpiece using CNC technology, this effect is of particular importance. Given that, it is advisable to know more about the machining arc effect of CNC machining of a workpiece.

The size and quality of the machined part may not be ideal if there is resonance, which occurs when vibration frequencies overlap. This can be caused by various factors such as processing technology, inappropriate parameter settings, and high feed speeds, resulting in unsynchronized arc processing. Loose or overly tight screws can also affect synchronization, while worn timing belts exacerbate the problem. To resolve the issue, the resonating parts should be identified and their frequency altered to avoid resonance. The processing technology and programming should also be optimized for the material being worked on, and stepping motors should be operated within suitable speeds. The placement of the machine tool, stability, and tightness of tool holders, as well as other related issues such as wear and gap size, should be checked. Replacing the timing belt may also be necessary.

cnc-machining-acrylic

The large taper phenomenon observed in CNC machining workpieces is primarily due to improper adjustments in the machine tool placement level. Uneven placement leads to one end being higher and the other lower. Also, when the long axis is turned, the material produced is relatively harder, and the cutting tool bites deeper, causing tool yielding. Often, the tailstock thimble is not concentric with the main shaft. To solve these issues, one can use a level to adjust the machine tool's level, establish a sturdy foundation, and secure the machine tool to avoid any mishaps. Additionally, improving the machine tool's toughness, selecting an appropriate process, and outlining the correct cutting feed can prevent the tool from yielding forcefully. Finally, adjusting the tailstock can also help to solve this problem.

The phase light of the CNC machining driver is normal, but the size of the workpiece to be processed varies. The reason is that the long-term high-speed operation of the tool holder of the machine tool causes the wear of the screw and the bearing. The repeated positioning accuracy of the tool holder will deviate during long-term use. The carriage can return to the machining starting point precisely every time, but the dimensions of the machining workpiece will still change. This phenomenon is usually caused by the spindle. The high-speed rotation of the spindle causes serious bearing wear, resulting in changes in the machining dimensions. Solution: Use a dial gauge to lean against the bottom of the tool holder, edit a fixed cycle program through the system, check the repeat positioning accuracy of the tool holder, adjust the screw clearance, and replace the bearing. Use a dial indicator to check the repeated positioning accuracy of the tool holder, adjust the machine or replace the tool holder; the dial indicator is used to check whether the processed workpiece is accurately returned to the starting point of the program. Overhaul the spindle and replace the bearings, if possible.

CNC machining workpieces can suffer from accuracy issues and poor surface finishes due to a combination of reasons. Firstly, the tool tip may be damaged or dull, which can lead to size discrepancies and surface roughness. Secondly, the machine tool may experience resonance or instability issues, causing further inaccuracies. Thirdly, crawling of the machine may occur due to worn carriage rails or loose balls.

Fortunately, there are steps that can be taken to rectify these issues. For example, blunt or damaged knives can be resharpened or replaced with better ones. The machine tool can be leveled and stabilized by laying a solid foundation and ensuring proper fixing. To address issues with crawling, worn carriage rails or damaged balls can be replaced as needed.

Maintenance is also critical to ensuring CNC machines function optimally. Regular cleaning and lubrication can help reduce friction. Appropriate coolants should be selected for workpiece processing, and higher spindle speeds should be used where feasible to meet processing requirements. Through these measures, the accuracy and surface finish of CNC machined workpieces can be improved upon significantly.