Sixth, ED-NC-32 EDM machine tool Fault phenomenon; C-axis often runs at high speed, no alarm signal; there is no alarm signal when starting from C-axis high speed. According to the analysis of the fault phenomenon that the C-axis speed is close to the maximum speed at the time of stall, the following three aspects are first considered: (1) speed command (VCMD) abnormality; (2) speed feedback loop abnormal; (3) servo amplifier abnormality. Use the HP54602 digital memory oscilloscope to observe...
Third, DK7725E CNC wire cutting machine Symptom: The pulse power supply output is faulty. The machine tool generates a corresponding pulse width and interval by the multi-vibrator, and is inverted and amplified by the transistor V1. When the control machine sends a pulse power signal, the relay K2 is sucked, and the pulse waveform signal is transmitted to the power amplifier circuit through the emitter output device V2. For machine tool discharge machining. S1 is the debugging switch. When the...
First, Sanguang brand CNC wire cutting machine Fault phenomenon: Stepper motor is out of step. The working principle of the stepper motor is shown in Figure 1. S1 is a feed switch that uses a normally closed contact. The PA of NAND input 2 is the stepper motor control signal from the computer. When the feed switch is turned off, or the control signal PA is at a low level (0.8 V or less), the output of the NAND gate is at a high level, and the input terminal of the photocoupler V1 does not have...
CNC machine tools are the key equipment of modern manufacturing. The output and technical level of a national CNC machine tool represent the manufacturing level and competitiveness of the country to some extent. So far, the technical level, performance and quality of CNC machine tools in China are still far from those in foreign countries. Simple CNC lathes with low technical content still dominate. High-end CNC machine tools and functional components mostly rely on imports. Therefore, although...
First, the cause of abnormal processing accuracy The cause of abnormal machining accuracy is concealed and the diagnosis is difficult. Based on years of practical experience, the author summarizes five main reasons: the machine feed unit is changed or changed; the zero offset of the machine axes is abnormal; the axial back gap is abnormal; the motor running state is abnormal, that is, the electrical and control parts are abnormal. Mechanical failures such as lead screws, bearings, couplings and...
Yu Jianxun, deputy general manager of Shaanxi Hanjiang Machine Tool Co., Ltd. Shaanxi Hanjiang Machine Tool Co., Ltd. is a leading manufacturer of precision thread grinders invested by the state in 1969. It is a large-scale backbone enterprise of machinery industry. It mainly produces precision thread grinder series, worm grinder, special special machine, precision measuring instrument, high precision CNC precision machine tool and rolling function. Parts and other products. Hanjiang Machine...
1 The influence of NC programming on machine tool machining accuracy and its solution 1.1 The influence of the choice of programming origin on the machining accuracy and control measures When programming NC, the first factor to consider is the determination of the programming origin. Generally speaking, the determination of the programmed coordinate system requires the relevant operator to consider the characteristics of the required machined parts and drawings, etc., in which the determination...
The machining process of CNC machine tools involves a wide range of factors, and there are many influencing factors. When processing the workpiece, the processing characteristics of CNC machine tools should be considered. 1. Analyze the dimensioning method in the part drawing Figure 1 Unified reference labeling method The method of engraving the size or directly labeling the coordinate size with the same reference is a unified reference labeling method. The marking method (shown in Figure 1) is...
In production, it often encounters faults in the machining accuracy of CNC machine tools. Such faults are highly concealed and difficult to diagnose. The main causes of such failures are the following: 1) The machine feed unit has been changed or changed 2) The zero offset (NULLOFFSET) of each axis of the machine tool is abnormal. 3) Axial backlash (BACKLASH) anomaly 4) The motor is running abnormally, that is, the electrical and control parts are faulty. 5) In addition, the preparation of the...
Quickly establish the machining accuracy of CNC carving equipment in three minutes This article is suitable for CNC engraving machine beginners to quickly popularize knowledge. Let's look at the machine first, the verticality, flatness, positioning accuracy and repeated positioning accuracy between the shafts. Taking the positioning accuracy as a simple example of 0.01mm / 300mm, this is the theoretical maximum accuracy that can be achieved for each 300mm of the device. At 0.01mm. Look at the...
Because more and more factories use automatic control, manual operation is replaced by mechanical or automation equipment, the executive body is required to act as an interface between the control system and the valve mechanical movement, and the implementing agency is required to enhance the work safety performance and Environmental protection performance. In some hazardous situations, automated actuator installations reduce personnel injuries. Some special valves require emergency opening or...
Compared with the internal cylindrical grinding machine of lathes, milling machines, etc., the use of CNC system later, due to its special requirements for CNC system. In recent decades, with the realization of CNC technology, continuous grinding wheel dressing, automatic compensation, automatic wheel change, multi-table, automatic transmission and clamping workpiece, CNC technology has gradually become popular in surface grinding machines and internal cylindrical grinding. Internal grinding...
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