Key Points In Design Of Forging Drawings For Multi-directional Die Forging

Key points in design of forging drawings for multi-directional die forging

1, the selection of the die surface of forgings, the principle of the choice of die surface in addition to the general according to open die forging, but also according to the forming characteristics of multi-directional die forging to consider the mold, technology and other aspects of the problem. (1) The layout of the die surface should be dizzy to meet the requirements of forgings relative to the mold face, especially for the forgings with no protruding abutment, shoulder and branch buds.

The die surface shape chooses the plane as much as possible and avoids the surface.

(2) The position of the center of the forging hole, the multi-directional die forgings are with the hole forgings, the surface forging drawing should be determined in the horizontal direction as far as possible, and the deformation of the hole is in the upsetting state. (3) The combination of molds, because multi-directional die forging using a number of die surface, so that the mold into more than one block, the combination of shapes.

But the monolithic mold manufacture is simple, but must combine the multiple modules the size and the match precision good closed die chamber, when chooses the mold surface, simultaneously considers makes the module easy to combine, and the work is stable and reliable. (4) The calculation of clamping force, in the multi-directional die forging, the clamping force of the concave die on the blank is generally the punch to the extrusion of the material of the squeeze forming force of 1 4 times times, so the clamping force is greater than the forming force.

Therefore, the maximum projection surface of the forgings should be placed under the action of the main hydraulic cylinder of the equipment, that is, the direction of the clamping force is designed to produce the maximum pressing force in the equipment. 2, forging machining allowances and tolerances, multi-directional die forgings, especially some medium and small forgings, often closed precision die forging form, therefore, the design of forging drawings should be as close as possible to the shape of the product parts contour, a large reduction in machining allowances and tolerances.

The machining allowances and tolerances used in multi-directional die forging are generally selected as 20%-50% of common open die forgings for hot-die forging presses. 3, fillet radius and deep hole angle, the size of the fillet radius of the multi-directional die forgings is the same as that of the closed die forgings, the 1/4?1/2 of the general die forging is advisable.