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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

Semikron SKM200GAL173D

Semikron SKM200GAL173D
#SKM200GAL173D Semikron SKM200GAL173D New Igbt Module 1.7kv 220a Semitrans 3., SKM200GAL173D pictures, SKM200GAL173D price, #SKM200GAL173D supplier
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Email: sales@shunlongwei.com

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SKM200GAL173D Features:

• MOS input (voltage controlled)
• N channel, Homogeneous Si
• Low inductance case
• Very low tail current with low temperature dependence
• High short circuit capability, self limiting to 6 * Icnom
• Latch-up free
• Fast & soft inverse CAL diodes8)
Isolated copper baseplate sing DCB Direct Copper Bonding
• Large clearance (13 mm) and creepage distances (20 mm).
Typical Applications:
• AC inverter drives on mains 575 - 750 VAC
• DC bus voltage 750 - 1200 VDC
• Public transport (auxiliary syst.)
• Switching (not for linear use)
1) Tcase = 25 °C, unless otherwise specified 2) IF = – IC, VR = 1200 V, – diF/dt = 1000 A/µs, VGE = 0 V
6) The free-wheeling diodes of the GAL, GAR and D1 types have the data of the inverse diodes
of SKM 300 GA 173 D
8) CAL = Controlled Axial Lifetime Technology.
Maximum ratings and characteristics 
.Absolute maximum ratings (Tc=25°C unless without specified)
Collector-Emitter voltage Vces:1700V
Gate-Emitter voltage VGES:±20V
Collector current Ic:220A
Collector current Icp:440A
Collector power dissipation Pc:1250W
Collector-Emitter voltage VCES:4000V
Operating junction temperature Tj:+150°C
Storage temperature Tstg :-40 to +125°C
 


Igbt Module 1.7kv 220a Semitrans 3.

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