Factors Affecting CNC Machining Prices

Nowadays, CNC machining has demonstrated its importance in various industries, such as military industry, medicine, aviation, automobile, motorcycle, electric power and other fields have been highly dependent on CNC machining. At present, there are more and more companies like Jiahangaero that can provide CNC service. When we choose a machining manufacturer, we need to understand what affects the price of CNC.

Machine

A complete cnc processing system consists of machine tools, workpieces, fixtures and tools. Machining accuracy is related to the accuracy of the entire process system. Various errors of the process system will be reflected in different forms as processing tolerances under different circumstances. cnc machine accuracy is an important factor affecting the quality of prototype parts. When the accuracy of the machine is poor, some parts are damaged or the clearance of each part is not adjusted properly, various defects will appear in the prototype during the cnc machining process.

Therefore, we must not only choose the appropriate turning angle, appropriate cutting amount and CNC processing method, but also understand the influence of machine tool precision on the quality of CNC processing. The maintenance of the machine directly affects the processing quality and production efficiency of the prototype. In order to ensure working precision and prolong its working life, all machines must be properly maintained. Usually after the machine has been running for 500 hours, a level of maintenance is required.

CNC machining method

There are many CNC machining methods, cutting machining is one of the most common. During the cutting process, the workpiece is subjected to force and heat changes, and the physical and mechanical properties of the metal material will also be slightly hardened, so the choice of cutting tools plays an important role. In general, the material for making the tool should be selected according to the material of the workpiece to be processed. Otherwise, thorns related to the tool will be formed on the surface of the workpiece, which will easily increase the roughness of the workpiece and reduce the surface quality at the same time. In addition to tool factors, the cutting environment and cutting processing conditions, such as cutting amount, cutting lubrication, etc., also have an impact on the processing quality. In the cnc machining process, the machining system is the commander-in-chief of the entire cutting process. All cnc machining processes are executed according to the system, so the precision and rigidity of the machining system are also one of the main factors affecting the quality of machining. There are two principles for processing technology arrangement:

• Dispersed processing: use multiple processes to manufacture complex parts and decompose them into multiple machines for processing.

• Concentrated processing: compound machine functions, such as CNC turning and milling compound, laser ultrasonic vibration processing, grinding, five-axis linkage, etc.

All processes are completed by one machine. According to the structural analysis of the workpiece, the use of different processing methods is also an important factor affecting the processing quality.

Processing requirements

For precision parts with large volume and complex shape, more materials are required, and the waste generated by processing will also increase, and the cost will also increase. Tighter tolerances increase the cost of CNC machining. Tighter tolerances require more time and more effort to produce parts. It also needs better quality control equipment for inspection. Tighter tolerances will dictate the tools, machines and cutting techniques used to make the parts.

Material

Machining materials are generally divided into plastics and metals. Each material has its own characteristics. It is also important to select the appropriate material according to the requirements and applications of the workpiece during processing. The consistency of the material is better, otherwise the quality of the same part may vary. When the material hardness is appropriate, try to ensure that the material does not deform. These are important prerequisites for assessing quality. Different materials also affect the cost of raw materials, and the price of metal raw materials itself fluctuates greatly. Take aluminum as an example. From January 2020 to July 2023, the lowest aluminum price in China was 12,000 yuan per ton, and the highest was 24,000 yuan per ton. The price difference is huge.

QC

After the machine has finished processing the workpiece, inspection is the last critical step before delivery to the customer. Machining inspection generally needs to pay attention to two aspects:

• 1 Inspection procedure—the inspection process includes the inspection process, as well as relevant regulations, systems, standards, etc. Generally speaking, the inspection process is the intervention and intervention methods of the inspection in the production process, including first inspection, self-inspection, mutual inspection and full-time inspection.

• 2 Inspection method - refers to how to inspect and inspect the standard. The inspection of machined parts is generally based on mechanical drawings, and the products are inspected through inspection instruments and measuring tools.

Traditional machining testing and more modern machining testing Traditional machining testing instruments include micrometers, dial indicators, vernier cards, planes, rulers, levels, and various plug gauges and ring gauges. More modern machining testing instruments include optical collimators, projectors, three-dimensional measuring instruments, theodolites, laser detectors, etc. Qualified mechanical product inspectors must master the knowledge of inspection instruments and measuring tools related to unit products. In the cnc processing process, to control the processing quality, it is necessary to understand and analyze various influencing factors that the processing quality cannot meet the requirements, and at the same time take effective technical measures to overcome them.

Post-processing

Many users'products require follow-up processing due to different fields involved, such as oxidation, spraying, heat treatment, etc. These processes are also an aspect of increasing product costs. Therefore, engineers must conduct sufficient evaluation of the product when designing the product. And measure the price/performance ratio.

With the continuous improvement of modern production levels, the requirements for the quality of machined products are also getting higher and higher. Only by taking comprehensive measures for quality control can we finally achieve the purpose of improving the service life of the equipment and improving the service life of the equipment, taking into account economic benefits and energy saving in the process of processing. At the same time, the quality of machining must be guaranteed in order to promote the long-term and stable development of the machining industry.