SU82201A1 - Electrodes for surfacing dies - Google Patents

Description

Known methods for improving the durability of stamps for metal stamping have essential defects.

Chemical-thermal treatment (nitriding, cyanidation, chrome plating, etc.) is applicable only on small dies for stamping with a calm and evenly distributed load on the stamp engraving.

Welding of working engravings of stamps with hard alloys such as stealite, stalinite, sormaite, etc. is possible only by autogenous welding. This method is applied on small stamps with a simple engraving. Hard-prints and stamps with dimensions of over 80 mm can hardly be deposited. Mechanical treatment of the deposited steelite is possible only by time-consuming polishing, which is costly.

Stamping loose prints is applicable only in large-scale mass production.

Resistant punches are produced by applying the described electrodes for arc welding of stamp engravings made of alloyed metal rods to which a three-layer coating is applied — alloying, crushing and slag-forming layers.

Electrodes for surfacing dies, obtained using alloyed wire grades X12M, X12, HVG and CG are covered with a slag layer; It consisted of 55% chalk, 12% sand, 23% fluorspar and 10% titanium dioxide. The deoxidizing layer consists of 38% ferromanganese and 62% ferrosilicon, and the alloying layer is made from ferrotitanium with or without the addition of ferromolybdenum.

Steel rods are coated as follows. A thin alloying layer is applied to the clean surface of the rod.

A thin deoxidizing layer of ferrosilicon and ferromanganese is also applied to the alloying layer and, finally, the surface of the rod is covered with a thick ceramic slag layer.

These three coating compositions are made of fine ground powders with a grain size not larger than J 100. The binding element of the coatings is technically pure liquid soda glass with a content of: no more than 0.080% sulfur and 50% water. L; liquid glass is introduced in the amount of 400-450 g per I kg of dry powder.

The desired fluidity of the applied coatings is regulated. howl d.,: .

The composition and thickness of the layered coatings are shown in the tables. Each dough is applied by dipping or brushing after drying, and in the air of the previous layer. After applying a complete three-layer Hdfo coating, the electrodes are dehydrated in the basins at a temperature of 25 ° - 300 °.

The composition of powders in%

Coating thickness

The thickness of the metal rod, mm

For the manufacture of deposited dies, new U4-U7 carbon stalp blocks are used; Old worn stamps can also be used.

The engraving surface is lowered relative to the plane of the connector by 4-5 mm. On the surface of the engraving, grooves are cut by a w-irina and a depth of 4–5 mm, with the ducks running between them equal to 8–10 mm. The re-guiding of the grooves is perpendicular to the flow of the metal being forged. The grooves are necessary for mechanically strengthening the bond between the deposited layer and the metal of the block. Welding is performed by direct current with a voltage of 55 V (140 a) with 6 mm thick electrodes on a block heated to a temperature of 700-850 °.

The deposited cold stamp is immediately annealed at 720-800 °.

The annealed overlay is easily milled. The milling is carried out at the lowest point on the plane of the connector. The milled die is hardened at a temperature of 920-950 °.

Stamps up to 100 mm thick are released at a temperature of 350-400 °. With a greater thickness, the stamps are not subjected to tempering. The hardness of the weld engraving after quenching and tempering should be at least 40 Rockwell.

Milled and hardened weld stamps are mechanically processed.

The use of the proposed electrodes allows obtaining parts from high-temperature alloys.

Claims (3)

1. Electrodes for surfacing dies made with the use of alloyed wire grades X12M, X12, HVG and CG with a three-layer coating, distinguished by the fact that the layer of the coating contains 55% chalk, 12% sand, 23i% fluoride spar and 10% titanium dioxide; deoxidation, iy - 38% of ferromanganese and 62% of ferrosilicon, and diruyushu.iy incorporates ferrotitanium with or without the addition of ferromolybdenum. 2. Electrodes for welding dies but also. 1, which is based on the fact that when using an X12M or XB 5 electrode wire, the alloying layer is made of ferrotitanium. 3. Electrodes for surfacing dies under item 1, characterized in that when using electrode X12 or CG grade, the alloying layer consists of 35% ferrotitanium and 65% ferromolybdenum. .- 3 -J 82201 Subject invention