Die forging drawing is a kind of forging drawing, and it is also referred to as forging drawing or blank drawing for short. In addition to the requirements in the "forging drawing" bar, the drawing of die forging must also be considered for its own characteristics: the position of die dividing line, the selection of die forging slope, the determination of piercing and connecting pattern, the influence of forging process on the direction of forging fiber; The position of the test bar, the location of the mark, the steel number, etc. Qualified forgings must also meet the following requirements: the forgings forged according to the forging process specifications, the full size of the forgings should meet the requirements of the die forging drawing dimensions, at the same time, must meet the requirements of the die forging drawing as specified in the technical conditions, such as heat treatment hardness, displacement size, the size of the brim mark, bending, wall thickness difference. Surface defects, removal of oxide scale and mechanical properties.
Die forging drawings for crankshaft forging press: Die forging drawings for crankshaft forging press are basically the same as those for hammer forging drawings, but there are three special considerations: (1) Forging press with a plunger can be erected to forge forgings with long bars (i.e. the axis of the rod is in line with the direction of slider movement) to reduce die splitting. The margin of the forgings on the surface is reduced and the consumption of the rough edge metal is reduced; (2) The average size of the forgings on the forging press is 30-50% smaller than that on the hammer, and the specific figures can be determined according to the relevant manuals; (3) If the forgings are removed from the die groove by hand tongs, the die forging inclination is determined as well as the forgings on the hammer, when the plunger is used. When the forging is ejected, the die forging inclination can be significantly reduced, but it can not be completely eliminated, otherwise the ejector bar will be overloaded.