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 bett...
The Purpose Standardize the management of the scrapping of the company's metal stamping dies, prevent the loss of company assets, and formulate this system specially. Scope of application It is suitable for the management of the company's scrap molds. Definition If the molds listed in the assets of the company fall under one of the following circumstances, the use management department may apply for scrapping. 1. Molds that exceed the specified service life. 2. The mold is severely damaged by accidents or accidents, and molds that cannot be repaired or have no repair value. 3. Metal stamping dies that have not reached the service life, but due to safety, quality, efficiency and other issues, the repair still fails to meet the minimum requirements of the customer's product process or affects the production safety and efficiency. 4. Product customers have stopped placing orders or have not placed orders for molds in several years. 4. Responsibilities 1. Responsibilities of th...
KOVAR parts are commonly used as metal casing materials in the electronic packaging industry. Because they have a linear expansion coefficient close to that of molybdenum group glass, and can produce less sealing stress during the sealing (melting) process with molybdenum group glass, so To obtain good air-tightness, in order to make the metal tube and shell to achieve air-tight sealing, in the entire sealing process, the annealing process undoubtedly plays an important role as a link between the previous and the next. The internal stress generated during KOVAR machining also prepares the material structure for the implementation of the subsequent process-the sealing process of the metal parts. The main purpose of annealing Kovar shell before sealing is to: (1) Eliminate machining stress. When Kovar undergoes plastic machining deformation during cold working, about 10% to 15% of the applied energy is converted into internal energy, which is commonly referred to as internal stre...
The power transmitter is a combination of multiple precision parts and requires careful use and maintenance. Before using a power transmitter, you need to know its principle.
What is the principle of a power transmitter? Introduction to the principle and characteristics of power transmitters
Principle of power transmitter
transmitter
The power transmitter is mainly composed of three-phase isolated sampling circuit, A/D converter, single chip microcomputer, DSP device, D/A converter, calibration amplifier and special thick film integrated V/I converter.
After the three-phase AC input signal passes through the three-phase isolation sampling circuit, the common ground tracking voltage signal of the three-phase current and the three-phase voltage signal is formed. Under the control of the single-chip microcomputer, the A/D converter performs multi-point synchronous sampling on it, and the sample is obtained The data is calculated by the DSP device according to the principle of electrical engineering to calculate the three-phase active power (digital quantity) of the measured signal, and then the digital signal representing the three-phase power is converted into an analog quantity by the D/A converter, which is amplified and calibrated by the calibration amplifier Then, a direct current voltage output VZ is formed; the VZ output is passed through a dedicated thick film integrated V/I converter to form a 0-20mA or 4-20mA direct current output IZ.
Performance characteristics of power transmitter
As a professional instrument salesperson, you must be familiar with the characteristics of power transmitters and be more professional when communicating with customers.
The three ports of analog output, input, output, and power supply are isolated from each other.
Good linearity and high precision.
Automatic zero calibration and excellent temperature characteristics ensure the long-term stability of the instrument and avoid the need for periodic calibration of the transmitter.
All parameters are digitally calibrated. The analog adjustment of the conventional potentiometer is abandoned, the hardware circuit is simplified, and the reliability and stability of the whole machine are improved.
Perfect electromagnetic compatibility design, with strong anti-electromagnetic interference ability.
Full use of SMT devices, so that the product has the advantages of small size, low power consumption, and light weight.
Digital output
The input is isolated from the power supply and the output. For power transmitters using optical fiber transmission, the optical fiber not only plays a transmission role, but also plays a role in isolation. It can completely avoid the loss and interference of the transmission link, and is suitable for high-precision measurement in various complex electromagnetic environments;
The digital output transmitter is convenient for networked and intelligent applications.
The digital output power transmitter can form a virtual instrument together with the transmission system and the host computer. The function and display mode of the virtual instrument are determined by the software, which can realize multi-parameter values, meters, real-time waveforms, trend curves, and bar graphs. , Pie chart, vector diagram and so on.
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