东莞市三合机电设备有限公司

The mold patches the cold welding machine research and development process to introduce:
     Patches the cold welding machine internationally to call ELECTRO SPARK DEPOSITION, is applies by former Soviet Union's experts is similar develops in the electric discharge manufacturing machine Electro Discharge Machining circuitry research. The main application is uses high degree of hardness materials and so on tungsten carbide to carry on the coating processing to the mold/metal surface, enhances the resistance to wear, the thermal stability, bears the fever to stick and so on performance. Initial manufacturing machine coating thickness most greatly only could achieve 30üm about, therefore was unable to meet the patching needs. Afterward, underwent the massive research development, raised its output, improved the welding torch structure and the welding rod material ingredient. In view of the former porpoising type electrode, has used the rotary system electrode, and prevents the deposited metal using the argon shield the oxidation, the nitriding, has realized the continual multi-layered patching built-up welding, enhanced the patching built-up welding thickness, thus pushes to the market as the mold/metal repair manufacturing machine.
  Does not have the die making department's injection molding regarding these to form the factory, when the mold product presents the burr, uses the former welding method to repair mold's words, the mold can have the distortion, even thermal crack. If has not discharged manufacturing machine or milling machine cutting metal built-up welding Yu Rou and so on equipment, only then pays the high quota the repair expense to entrust the mold factory repair. Repair period, because machine's engine off can create the delivery detention.
   On the contrary, if will use this company's mold to patch the cold welding machine to carry on the repair not to have the distortion, flaws and so on undercut, may repair the mold simply. Metal built-up welding -odd meat may control to several silk. Does not need the special precision work machine, so long as with the small buffing machine, the dresser, the file, tools and so on oilstone carries on the manual precision work, the injection molding forms the factory to be possible from to present the burr to these mold product the mold to be divided the profile spot to carry on the repair simply, namely time-saving is also economical.
Three gather the mold to patch the cold welding machine to introduce:
1.    Principle of work:
           The mold patches the cold welding machine's principle is, use charge electric capacity, by 10-3~10-1 second cycle, 10-6~10-5 second ultra short time electric discharge. The electrode material and the mold contact spot will be heated up 8000~12000°C, the plasma condition's molten metal will transit by the metallurgy way to the work piece surface layer. What shown in Figure 1 is (built-up welding, coating) schematic drawing and each characteristic. A area is the built-up welding to the work piece surface coating or the built-up welding level, because has had the alloy function with the parent metal, to the work piece interior proliferation, the melt infiltrated, has formed diffusion layer B, obtained high strength
Union

2. Realizes the cold welding (hot piping to enter lowly):
Why can realize the cold welding, as shown in Figure 2, the discharge time (Pt) (It) compares with the next electric discharge time interval extremely short, the machine will have the enough relative stand-by time, the quantity of heat will proliferate the outside through the mold basic body, therefore the mold is processed the spot not to have the thermal accumulation. Although mold's elevation of temperature pauses nearly in the room temperature, but reason which, because the instant melts, the electrode acme's temperature may achieve 1000°C about.

4.  The mold patches the cold welding machine characteristic:

1.    Realizes the true cold welding, in the repair process the work piece does not need preheating or the heat preservation, in the built-up welding instantaneous process enters without the hot piping, thus the work piece does not distort, not the annealing, the undercut and the residual stress, does not change the work piece metal organization condition.
2.    The repair bond strength is high, because the welding rod is in instantaneous and shifts by the electric arc ionization to with above its contact work piece, therefore the bonding strength high will not fall off
3.    The repair precision is high, coating thickness from several microns to several millimeters, only need polish, polishing. May also carry on the vehicle, the mill, to dig, to rub, and later periods and so on galvanization processes.
4.    But one machine multipurpose, may carry on functions and so on built-up welding repair, superficial strengthening.
5.    The economical usability is high, may the online repair, raise the production efficiency on the spot, saving of time and expense. And the easy to operate, trains anybody after the short-term to be possible to carry on the operation use.
6.    Is suitable the parent metal to be broad, including each kind of molding tool steel, the stainless steel, the tool steel, the cast iron, the cast-aluminium, the aluminum alloy, the copper alloy, the nickel alloy and so on, as well as all may the electric conduction conductor.
7.    The environmental protection performance is good, does not have the noise, the dust, the waste liquid, the glare, different smelly.
8.    Even if the repair built-up welding level wears, may carry on the identical spot repairs the built-up welding many times.
9.    Using inert gas protections and so on argon, may obtain the high quality built-up welding level.
10.    As a result of the use revolving welding rod, will not produce sticks the silk principle elephant, the operation is easy, to obtain the high quality built-up welding level, moreover the built-up welding level's remainder may control is very small, thus has saved the precision work time.