The quality of forgings is very important to the forging plant, and the leaders also attach great importance to it. How should forging plants improve the quality of forgings?

In order to improve the quality of forgings, it is necessary to clean forgings, improve the cutting conditions of forgings and prevent surface defects from expanding. It is necessary to clean the surfaces of blanks and forgings at any time during the production of forgings. Remove the surface defects of forgings with a deoxidation leather machine.

Forgings are usually descaled by a descaling machine before forging after heating. The principle of phosphorus removal by high pressure water is adopted. The oxide scale on cold forgings can be removed by pickling or sandblasting. Non-ferrous alloy oxide scale is less, but it should be cleaned by pickling before and after forging to find and remove surface defects in time. Surface defects of blanks or forgings mainly include cracks, folds, scratches and mixtures. If these defects are not removed in time, it will have adverse effects on the subsequent forging process, especially aluminum, magnesium, titanium and their alloys. The defects of the above-mentioned nonferrous alloy forgings exposed after pickling are generally cleaned with a file, scraper, grinder or pneumatic tool. The defects of steel forgings were cleaned by the principle of high-pressure water dephosphorization.

Technological characteristics of die forging of aluminum alloy forgings

When selecting parting surface for aluminum alloy forgings, besides the same factors as steel forgings, uniform deformation should also be considered in particular. If the parting surface is not selected reasonably, it is easy to make the flow line of the forging disorder, and the end of the flow line is exposed after cutting off the burrs, and aluminum alloy forgings are more likely to have defects such as flowing through and rib-piercing cracks on the parting surface, thus reducing their fatigue strength and stress corrosion resistance. Ideally, the parting surface is generally formed by backward extrusion, and the streamline is distributed along the shape of the forging. The parting surface is formed by forging method, and the inner corner is easy to fold, flow through and the grain structure is uneven.

The surface oxidation, pollution and metallographic structure of aluminum alloy forgings are not obvious during forging, so the machining allowance should be less than that of steel, titanium alloy and superalloy. Aluminum alloy has great adhesion. In actual production, the die forging slope of 7 is usually adopted to facilitate feeding. If there is an ejection device, 1 ~ 5 can also be used.

The design of fillet radius is particularly important for aluminum alloy forgings. The small fillet radius not only makes the metal flow difficult and the fiber breaks, but also makes the forgings fold and crack, reducing the service life of the forgings. Therefore, the radius of fillet should be increased as much as possible. The fillet radius of aluminum alloy forgings is generally larger than that of steel forgings. In order to prevent aluminum alloy forgings from cracking on the parting line after cutting, the height of burr groove bridge and fillet radius of forgings are 30% larger than that of steel forgings.

Aluminum alloy forgings are not suitable for rolling and stretching dies. Because in rolling and stretching the blank, it is easy to produce cracks inside the blank. Generally, single-mode forging is adopted. Especially for forgings with complex shapes, multiple sets of dies and multiple die forging should be used. Make the blank of simple shape gradually transition to the forging with complex shape, so that the metal flows evenly, the filling is convenient and the fiber is continuous. Due to the high adhesion and poor fluidity of aluminum alloy, the working surface of the die needs to be carefully polished, and the wear direction is along the direction of metal flow, and the roughness of the working surface of the die reaches above 1.6. In order to reduce the surface thermal stress on the working surface of forging die, facilitate the flow of metal, fill the die and ensure the final forging temperature, the die must be preheated before working, and the preheating temperature is 250-400℃.

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