Category: Manufacturing Technology knowledge

1. The understanding of preloading of lead screw, wire rail and bearing is high-speed low load light preloading and low-speed heavy load high preloading. The preloading of the screw rod shall be 0.1 times of the dynamic load (according to THK), and the preloading of the rail shall be 0.13 times of the dynamic load (according to SCHNEEBERGER). The light, medium and heavy preloading of the bearing have detailed data on different samples (but the value is small). Moreover, for the lead screw, wire rail and bearing, generally speaking, when the load (axial load for the lead screw) exceeds three…

Flue check valve is also known as reverse flow valve, check valve, back pressure valve and one-way valve. This type of valve is automatically opened and closed by the force generated by the flow of the medium in the pipeline, and belongs to an automatic valve. Many people will wonder whether it has any effect on earth? Is it worth installing one? The following quick screen editor will tell you whether it is worth installing a flue check valve! The check valve is used in the pipeline system. Its main function is to prevent the backflow of the medium and…

In order to ensure the accuracy of NC machining, we conduct data processing on the three-dimensional acceleration sensor and other signals according to the signal time-domain analysis and frequency-domain analysis methods, extract the eigenvalues, and normalize the obtained eigenvalues, establish a neural network model, input the eigenvalues into the neural network for training, input the features to be tested after the training, and output the accuracy evaluation decision results from the neural network. Intelligent evaluation system model According to the hardware system, the machining accuracy evaluation model is established. The model is composed of different layers, including signal acquisition layer,…

Chemical laboratories generally need to use various chemical reagents. In addition to daily use, they also need to store a certain amount of chemical reagents. Most of the chemical reagents have certain toxicity, and some are inflammable and explosive dangerous goods. Therefore, it is particularly important to understand the properties and storage methods of general chemicals. A large amount of chemicals should be placed in the sample storage room and kept by special personnel. Dangerous goods shall be stored according to the management regulations of the national security department. First of all, remember: isolated storage! Inflammable, highly toxic, highly corrosive,…

For machining enterprises, in order to meet the needs of product expansion of the company, it is necessary to refine and revise the man hour quota of the CNC machining center according to the existing production situation of the company, the company's experience for many years, and the production process and characteristics of different models. Next, we will specifically introduce how to formulate the machining hours of the CNC machining center. 1. The significance of working hours in NC Machining Center Considering the current technical level and management level of the enterprise, improve the operation conditions and improve the operation…

Various engine factories at home and abroad have used CNC follow-up grinding machines to complete the processing of cams, and the follow-up grinding machines have completely replaced the eccentric fixture grinding in the past. The follow-up grinder can not only realize the different rotational speeds required for rough and fine grinding, but also automatically change the speed at different curve segments of the cam / crankshaft swing, so as to ensure that the grinding force and grinding amount of each grinding point on the profile are consistent. The flexibility, efficiency and accuracy of the grinder are greatly increased. For example,…

Because the ordinary lathe does not have the programming function like the CNC lathe, and cannot realize the automatic control of the tool head travel, it cannot directly process the spherical surface. The inner spherical surface processed by the CNC machining center is accurate in size and high in accuracy. However, for the workpieces with small quantity and large diameter of inner spherical surface, it is too expensive to use large CNC vertical lathe, and some errors will occur. So how to eliminate the error of NC machining spherical surface? Let's introduce it in detail. 1、 Causes of errors in…

In recent years, 3D printing technology has been paid more and more attention. The research on key technologies has made breakthroughs and the performance has been continuously improved. The application in the military field has made important progress and entered the fast lane of development and application. 3D printing will be widely used in the design of weapons and equipment, the manufacture of complex and expensive components, and maintenance support, and will have a positive impact on the development of weapons and equipment. Compared with traditional manufacturing, 3D printing technology has the advantages of low cost, high speed, good complex…

At the beginning of the design, the structural shape of the parts needs to meet two major requirements, one is the design requirement and the other is the process requirement. At the same time, the structural design of parts should consider not only industrial aesthetics and modeling, but also technological possibility. Most of the common structures on parts are obtained by casting (or forging) and machining, so they are called process structures. Understanding the common process structure of parts is the basis for learning part drawings. Casting process structure on parts 1. Cast fillet In order to facilitate the casting…

Automation based on monitoring computer (PC), programmable controller (PLC), human machine interface (HMI), intelligent instrument, industrial control communication network DCS (distributed control system) and FCS (field bus control system) has become the technical pillar of modern factories and has been widely used in modern production lines at home and abroad. According to the statistics of relevant departments, among the PLCs shipped worldwide in recent years, according to the end users, automobiles account for 23%; Food processing accounted for 16.4%; Chemical industry accounted for 14.6%; Metal mines accounted for 11.5%; Papermaking accounts for 23.1%. It can be seen that the application…