Quality Control And Inspection Methods For CNC Processed Metal Parts (cnc Parts Processing)

Quality control and inspection methods for CNC processed metal parts (cnc parts processing)

The quality of CNC machining of metal parts does not meet the standard requirements. If the situation is minor, the product will be scrapped and the delivery date will be delayed. If the situation is serious, it will cause equipment failure and even lead to safety accidents. A trustworthy machining factory must put quality control first.

Dimensional accuracy determines whether parts can be assembled

Among many metal parts, there are no design drawings, and the dimensional tolerances marked on the drawings are like a lifeline to them. Since its establishment in 2013, Jiebri has completed more than 12,000 precision parts processing cases, in which every product involved has undergone strict dimensional inspection procedures. During the entire processing process, high-precision three-dimensional coordinate measuring machines, micrometers and other tools will be used to repeatedly check the quality control and inspection methods of CNC processed metal parts (CNC parts processing) to ensure that there are no errors in key data such as diameter, length, hole spacing, etc. If the dimensions are out of tolerance, the parts cannot be installed into the equipment, and all parts will have to be reworked or even scrapped. The losses caused will be extremely huge.

In actual operating situations, workers engaged in processing need to conduct self-inspections every time they complete a processing step, and then inspectors will conduct random inspections based on different batches. This double guarantee method can block and intercept most size problems, thereby preventing batches of defective products from flowing into the next production link.

Surface quality directly affects service life

For metal parts, there should be no burrs or scratches on the surface, rust spots are also not allowed, and the processing texture should not be uneven. The impact of problems like this is not only reflected in the appearance, but also leads to a decrease in the fatigue strength of the parts and a decrease in corrosion resistance. When Jebray processes digital electronic product casings and robot parts, it strictly controls the surface roughness and uses microscopes and profilometers to check for microscopic defects.

In terms of precision parts, surface quality is related to the fit gap and sealing effect. For example , how to evaluate the quality of CNC machining services ? How to evaluate the quality of CNC machining services when key parts in automobiles have long-term vibration or high temperature environment? If there are tiny cracks on the surface, they may break, causing serious consequences. The same is true for key parts in office automation equipment.

Material composition determines performance stability

The same batch of metal materials with different furnace numbers may have different chemical compositions. Quality control must start from the source. Each batch of incoming materials must be analyzed for composition to confirm that the carbon content, alloying element ratio, impurity content, etc. are all in compliance with standards. When Jebray customizes high-end casings and non-standard parts for customers, it will strictly carry out material incoming inspection to prevent mixing of materials or the use of inferior materials.

If the material composition does not meet the standards, even if the processing dimensions are extremely precise, the parts may deform, crack, or wear prematurely after being subjected to external forces. This kind of problem often appears after a period of use, and the maintenance cost is extremely high.

Process monitoring prevents batch scrapping

During the CNC machining process, various factors such as tool wear, lack of coolant, and thermal deformation of the machine tool will affect the quality. JB's technical team monitors cutting parameters in real time during processing, replaces tools regularly and compensates for errors. At the same time, automated testing equipment is combined to automatically carry out a measurement every time several parts are processed. Once the data is abnormal, the machine will be shut down immediately for adjustment.

This preventive control method is more effective than post-event inspection. In 2019, Jiebri carried out a batch of precision shell processing work in response to the customer needs of a certain intelligent robot. During this process, the system detected slight wear on the tool. Subsequently, through timely replacement, the risk of scrapping of 300 products was avoided.

Problem feedback drives continuous improvement

Even with strict quality control, occasionally there will be individual products that do not meet standard requirements. The focus is on how to deal with and prevent it. Jiebri has built a complete problem recording and traceability system. Every time a quality problem occurs, the root cause will be analyzed to evaluate the quality of CNC machining services , and the process documents will be modified or employees will be trained. For example, during the processing of non-standard parts, there was a situation where the position of the threaded hole was offset. After careful investigation, it was found that the positioning fixture was loose, and then the fixture inspection was included in the daily inspection list.

With such closed-loop management, the recurrence rate of similar problems is getting lower year by year. Even product defects reported by customers can be responded to within 24 hours and a rectification plan can be formulated.

Choosing a processing plant depends on the quality system

To individually evaluate the quality of services of a factory engaged in CNC machining, one cannot just rely on looking at the price or delivery date. It is also necessary to explore whether it has complete inspection equipment, standard operating procedures, and quality management certification. Jiebri provides services in the fields of digital electronics, automobiles, robots, etc., and has always regarded "high-quality products and services" as its goal. We warmly welcome people to visit the factory to observe the testing equipment and on-site management.

Have you ever encountered project delays due to parts quality issues or equipment malfunctions? You are welcome to share relevant experiences in the comment area and like it so that more friends in the procurement field can avoid minefields.