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Working principle of slow wire processing

 Slow wire walking, also called low-speed wire walking, is a kind of CNC machining machine tool that uses continuously moving fine metal wire as an electrode to pulse spark discharge on the workpiece to generate a high temperature of over 6000 degrees, ablate metal and cut into a workpiece. The principle of wire processing is the phenomenon that there is a gap between the wire electrode and the workpiece, and the metal is removed by continuous discharge. Since the slow-moving wire cutting machine adopts the method of wire electrode continuous feeding, that is, the wire electrode is processed during the movement, so even if the wire electrode is worn out, it can be continuously supplemented, so it can improve the machining accuracy of the parts and slow the wire. The surface roughness of the workpiece processed by the cutting machine can usually reach Ra=0.8μm and above, and the roundness error, linear error and dimensional error of the slow-moving wire cutting machine are much better t

Classification of CNC Machining Occupation Levels

1. Blue-collar layer:   That is, CNC machining operation technicians, proficient in machining and CNC machining process knowledge, proficient in the operation and manual programming of CNC machine tools (attributes: automated machine tools), understand automatic programming and simple maintenance of CNC machine tools (attributes: automated machine tools), such There is a large market demand for personnel, and they are suitable for operating workers of CNC machine tools (attributes: automated machine tools) in the workshop, but due to their single knowledge, their wages will not be much higher.   2. Gray collar layer:   One, CNC machining programmer:   Master the knowledge of 5 Axis CNC machining Aluminum   technology and the operation of CNC machine tools (attributes: automated machine tools), be familiar with the design and manufacturing expertise of complex molds (title: mother of industry), and be proficient in 3D CAD/CAM software, such as UG, GOOGLE PRO/E, etc. ; Familiar with CNC

Elimination of Gear Backlash in CNC Machining Feed System

Elimination of Gear Backlash in CNC Machining Feed System   The transmission gear in the feed system of the CNC machining machine tool must eliminate the transmission gap between the meshing gears as much as possible, otherwise the motion will lag behind the command signal after each reversal of the feed system, which will affect the machining accuracy (accuracy) ). There are the following two common methods for CNC machining machine tools to eliminate the transmission gear gap.   1. Rigidity adjustment method   The rigid adjustment method is an adjustment method that cannot be automatically compensated for the tooth side clearance after adjustment. Therefore, the pitch tolerance and tooth thickness of the gear must be strictly controlled, otherwise the flexibility of the transmission will be affected. This adjustment method has a relatively simple structure and a better transmission rigidity.   (1) Eccentric shaft adjustment method   As shown in Figure 610, the gear 1 is mounted on th

What is FPGA

FPGA design is not a simple chip research, but mainly uses the FPGA model to design products in other industries. Unlike ASICs, FPGAs are widely used in the communications industry. Through the analysis of the global FPGA product market and related suppliers, combined with the current actual situation in my country and domestic leading FPGA products, we can discover the future development direction of related technologies, which will play a very important role in promoting the overall improvement of my country's technological level.


Compared with traditional chip design, FPGA chips are not simply limited to research and design chips, but can be optimized for products in many fields with the help of specific chip models. From the perspective of chip devices, FPGA itself constitutes a typical integrated circuit in a semi-custom circuit, which contains a digital management module, an embedded unit, an output unit, and an input unit. On this basis, it is necessary for FPGA chips to focus on comprehensive chip optimization design, and to add new chip functions by improving the current chip design, thereby achieving the simplification and performance improvement of the overall chip structure.

Basic structure
FPGA device is a kind of semi-custom circuit in the application-specific integrated circuit, which is a programmable logic array, which can effectively solve the problem of fewer gate circuits in the original device. The basic structure of FPGA includes programmable input and output units, configurable logic blocks, digital clock management modules, embedded block RAM, wiring resources, embedded dedicated hard cores, and underlying embedded functional units. Because FPGA has the characteristics of abundant wiring resources, repeatable programming, high integration, and low investment, it has been widely used in the field of digital circuit design. The FPGA design process includes algorithm design, code simulation and design, board debugging, designers and actual needs to establish the algorithm architecture, use EDA to establish a design plan or HD to write design code, through code simulation to ensure that the design plan meets actual requirements, and finally board Level debugging, use the configuration circuit to download the relevant files to the FPGA chip to verify the actual operation effect.

Working Principle
FPGA adopts the concept of logic cell array LCA (Logic Cell Array), which includes three parts: Configurable Logic Block (CLB), Input Output Block (IOB) and Interconnect. Field programmable gate array (FPGA) is a programmable device. Compared with traditional logic circuits and gate arrays (such as PAL, GAL and CPLD devices), FPGA has a different structure. FPGA uses a small look-up table (16×1RAM) to realize combinational logic. Each look-up table is connected to the input of a D flip-flop, and the flip-flop drives other logic circuits or I/O to form a combination that can be realized. The logic function can also realize the basic logic unit module of the sequential logic function. These modules are connected to each other or I/O modules by metal wires. FPGA logic is realized by loading programming data into the internal static storage unit. The value stored in the memory unit determines the logic function of the logic unit and the connection between modules or between modules and I/O, and finally determines The function that FPGA can realize, FPGA allows unlimited programming.

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