3d cnc machine is an automated machine tool controlled by a program. Its performance and applicability are higher than other CNC machine tools. However, due to its technical requirements and other factors, its price is relatively expensive. So, when we choose 3d cnc machine, when you don’t know the price of 3d cnc machine, you must first understand the manufacturer of 3d cnc machine. After learning about the 3d cnc machine manufacturer, we will have a general understanding of the price of the CNC machining center required, and then further understand its after-sales service. This is the so-called equal quality than price, equal price than service. Then the quality is only relative, there is no absolute quality. Therefore, before purchasing a 3d cnc machine, you have to estimate the price range of your purchase.
1. Configuration:
As we all know, 3d cnc machine is composed of multiple core components and related connecting parts. Any problem in any link may cause serious damage to the 3d cnc machine. Therefore, we must first start with the core components:
1. Spindle: The spindle is a major core component of the 3d cnc machine. Most of the machining surface accuracy is related to the spindle, so the quality of the spindle is very important. At present, the spindles produced in mainland China are rarely used on 3d cnc machines, which shows that the quality of the high-speed spindle units produced in mainland China needs to be improved. Taiwan-made spindle units are widely used in the market, and their prices vary greatly according to their brand awareness and market share.
At present, the commonly used spindles of 3d cnc machine on the market have the following brands: royal, KERturn, and the price is long along the way. It is recommended that you choose according to your product requirements. Under normal circumstances, the 3d cnc machine manufacturer can change it for you according to your requirements. The specific details of the configuration should be further discussed with the 3d cnc machine manufacturer. (If conditions permit, please support domestic brands)
2. Ball screw: The most commonly used transmission element in precision machinery. Its main function is to convert rotary motion into linear motion, or convert torque into axial repetitive force, and it has both high precision, reversibility and high efficiency. specialty. Its manufacturing requirements are also relatively high, including material and assembly accuracy.
The ball screw determines the transmission accuracy of the equipment. Its material, accuracy, pre-tightening force, cutting resistance, lubrication, load, etc. may cause the ball screw to wear quickly, create gaps or other irreparable problems. Therefore, this is also the key point.
The commonly used ball screws of CNC machining centers can be divided into P2/C2, P3/C3, P4/C4 according to the accuracy. There are also a small number of CNC machining center manufacturers that choose P5/C5 (the smaller the number, the higher the accuracy), and the rolling level is divided according to the process. And grinding grade, the latter is more accurate than the former.
At present, there are various brands of ball screws commonly used in 3d cnc machine, including mainland China, Taiwan, Japan and Germany. The use of ball screws made in mainland China in CNC machining centers, except for the Nanjing technology which is common on the market, is rarely seen in Hanjiang and Bot. At present, the commonly used ball screw brands for CNC machining centers are: Nanjing Technology, TBI, Yintai, Shanghai Bank, THK, NSK from Japan, and STAR Rexroth from Germany. (If conditions permit, please support domestic brands)
3. Tool magazine: 3d cnc machine tool magazine is divided into three types: hat type, disc type, and chain type, and the number of tool holdings increases sequentially.
The hat-type tool magazine is generally near the spindle head. It requires up and down movements in the spindle direction when changing tools, which takes up working time and reduces work efficiency. It also affects the working stroke range of the spindle direction, but because of its simple structure, the failure rate is relatively low.
The disc tool magazine uses a manipulator to change the tool, and the tool change speed is fast, but the failure rate is relatively high. There are also a few disc type tool magazines and the hat type tool magazine directly changes the tool through the spindle. The chain type is generally used on models with a higher number of tools, and its price increases sequentially. At present, the common tool magazine brands include First Round, Jifu, Shengjie, Deda. Choosing the right brand and type is more important.
4. Guide rail: The commonly used guide rails for 3d cnc machine can be roughly classified into the following three categories according to their accuracy, C ordinary level, H high precision level, and P ultra-precision level. Generally, the guide rails for 3d cnc machine are above H level. According to the type, it can be divided into three types: hard rails, linear slide rails, and steel-inlaid rails.
Hard rail is characterized by good rigidity, but the disadvantage is that because of the large friction resistance, the accuracy and speed are relatively low. Suitable for large cutting amount processing.
There are two common linear slide rails for 3d cnc machine, one is ball guide, the other is roller guide. The ball guide rail, as its name implies, achieves linear sliding through the rolling of steel balls, while the roller guide uses cylindrical rollers to achieve linear sliding, and its friction resistance is less than that of a hard rail. The ball guide rail is point contact, and the roller guide rail is in line contact. Therefore, the friction resistance of the roller guide rail is greater than that of the ball guide rail, and its rigidity is stronger than that of the ball guide rail. Therefore, the guide rails for CNC machining centers are generally hard rails and roller guides, and there are more ball guides for small engraving and milling machines.
The user should pay attention to the following points when choosing a hard rail: 1. The quenching hardness of the guide rail is generally above HRC50°. 2. Whether the worktable is plasticized, (small iron powder or cutting will be generated when the guide rail is rubbed. The plasticized guide rail has strong abrasion resistance and soft material, which can be accommodated in the plastic rail and reduce the wear of the guide rail. The service life of plastic rails is longer than that of non-plastic rails.) Users can choose hard rails or linear rails according to their own conditions. At present, the commonly used linear guide brands for CNC machining centers on the market are: Nanjing Technology, TBI, Yintai, Shanghai Silver, Guizi's THK, and German Rexroth. The price difference is also very large, and it is most important to choose the right one.
5. Bearings: Machine tool spindle bearings are generally equipped by spindle unit manufacturers. Taiwan-made spindle units are generally equipped with Japanese NSK, Swedish SKF or French FAG. Normally, Taiwan-made spindles are generally equipped with small Japanese NSK. As far as the brand is concerned, the selection of this bearing brand is not under the control of CNC machining center manufacturers, and currently it can meet the needs of most users, as long as the brand of the spindle unit is selected.
In addition to the spindle bearing, the lead screw bearing is also the key here. Ball screw bearings for CNC machining centers generally use angular contact ball bearings, but major bearing manufacturers basically have special ball screw bearings based on their use characteristics, which are characterized by a 60-degree contact solution and can withstand higher axial directions. Force, accuracy and rigidity are relatively high. Currently commonly used angular contact ball bearing brands are: Wafangdian Bearing, Luoyang Bearing Research Institute, Harbin Bearing, Taiwan TPI, Japan NSK and other brands. (If conditions permit, please support domestic brands)
6. Bearing lock nut: These two parts are small in size, but they also play an important role. From the above content, we know that the bearings and lead screws for 3d cnc machine are high-precision parts, so the selection of bearing lock nuts is also very important. Some manufacturers have the conditions to produce them by themselves. Most manufacturers purchase from professional bearing lock nut manufacturers, such as Beijing Zhengshuo and Taiwan Yingxi.
7. Coupling: The coupling is the connection between the motor and the lead screw, and is also used for the connection of the spindle motor and the spindle on some direct-coupled boxes. Its role not only plays a role in connection, but also has an important role in transmitting torsion. Therefore, whether on the spindle or on the lead screw, its quality cannot be ignored. At present, there are many brands of couplings used in CNC machining centers, including those made in China, Taiwan, and other imported brands. The price difference is also several times as large.
8. CNC system, servo motor, driver: This part is an important item of the cost of 3d cnc machine. There are also many commonly used brands and the price difference is relatively large, so I will not repeat it here. In the operation of CNC machining center, the proficiency of the system operation is inversely proportional to the failure rate, because many failures or problems are caused by not operating. Therefore, users should choose their own operating habits or system brands with high cost performance.
2. Body and other parts
1. There are many links that affect the quality of 3d cnc machine, and there are many factors. It does not mean that the selected configuration is a good CNC machining center. Therefore, it is also necessary to understand its product manufacturing and assembly processes, such as whether the body castings have undergone aging treatment. ; Can the machining accuracy of the key parts such as the motor seat ensure the accuracy requirements? Can the installation process of the linear rail and the lead screw guarantee the accuracy?
Requirements, etc. Of course, this type of content is generally kept confidential by manufacturers. Users can go to the 3d cnc machine manufacturer to get a rough idea.
3. Machine tool specifications: At present, many 3d cnc machine manufacturers use optical machines for production. The specifications of these manufacturers are basically the same. Some manufacturers are in order to provide users with more value-added products, or to enhance their competitiveness. Of course, some are to reduce costs, and the parameter ranges of machine tools of the same model are also quite different. This content can be reflected from the overall dimensions of the machine tool, technical parameters and the weight of the machine tool.
Machine shape: People rely on clothes, horses and saddles. A good product should have a good appearance. A 3d cnc machine bought from hundreds of thousands or even hundreds of thousands should also have a good appearance. The product is not beautiful and not atmospheric. It is also a measurement basis. Not only the value of the purchase that you think is the value of the purchase, but also the value of the purchase if you want to show it to your friends.
