Method and die for drawing inclined-bottom vessel swinging female die with bottom inclination angle smaller than 45 degrees

Abstract

The invention discloses a method and a die for drawing a rocking concave die of an inclined bottom vessel with a bottom surface inclination angle of less than 45 degrees. The die comprises a male die, a female die assembly and a swing shaft, the female die assembly comprises a female die and a blank holder, and the swing shaft is located at a proper position of the outer edge of the female die assembly. The deep drawing method comprises the steps that a plate blank is clamped by the female die assembly and inclines to form an included angle of 0 degree along with the end face of the male die; the press sliding block moves downwards to apply acting force to the acting point of the female die assembly, so that the female die assembly drives the slab to swing / rotate around the swing axis relative to a static component; the female die assembly swings to a preset angle, and drawing deformation on the periphery of a female die opening is synchronously finished; the press sliding block ascends and stays at a high position, the female die assembly drives the workpiece to reversely swing around the swing axis to reset by means of an elastic jacking device, the die part influencing taking-out of the workpiece is removed, and the inclined bottom vessel workpiece is taken out. According to the method, the plate blank is simply, conveniently and reliably drawn into the inclined-bottom vessel workpiece, wherein the dome is not obviously thinned, and the area around the dome is not prone to wrinkling.

Description

technical field [0001] The invention belongs to the technical field of mechanical parts manufacturing technology, and relates to a stamping forming process with a plastic metal plate whose thickness t ranges from (0.1 to 10) millimeters as the processing object, in particular to a deep drawing method and a mold thereof, and specifically relates to a bottom surface inclination angle less than 45° The deep-drawing method and mold of the slanted bottom dish rocking die. Background technique [0002] For sheets with a small thickness t, in order to ensure the surface quality of the workpiece, stamping is generally carried out at room temperature (commonly known as cold stamping); if t is large, even greater than 10 mm, the sheet can be heated and pre-pressed according to relevant specifications. Hot mold, red punch processing, but generally will reduce the surface quality of the workpiece. [0003] Bowls, cups, plates, saucers, spoons, tubes, basins, boxes (without lids), cover...

AI Technical Summary

Problems solved by technology

The advantage of splicing is strong adaptability, almost any shape of dish can be made, generally no special mold is needed (but some general tools may be used), and the wall thickness of the part is not thinned or the thinning is very small; It is poor integrity, affected by factors such as human operation differences and uneven residual stress after welding, the shape accuracy of the workpiece is not high, the consistency is poor (if mass production), and the production process is cumbersome, the production cycle is long, and the efficiency is low.

The advantage of oscillating punch forming is that the initial contact surface between the punch and the blank is larger, which reduces the suspended area, which is beneficial to alleviate the thinning of the dome and the wrinkling of the side wall; the disadvantage is that for general small and medium parts, the blank holder The space within the perimeter of the ring is limited, and it is difficult to set up a hinge mechanism and a trolley (for supporting use) that can withstand a large force; in addition, the change rule of the blank holder force provided by the elastic die is that it increases slowly in the early stage and increases rapidly in the later stage. , there is a large deviation from the ideal state that the drawing needs to increase rapidly in the early stage and decrease in the later stage; it is also difficult for the elastic die to control the deformation of the flange area without wrinkling

The disadvantage is that the wall thickness of the workpiece is significantly thinned, limited by the rigidity of the machine tool and tool head, the shape accuracy is limited, and the efficiency is not high

Using the pendulum-type die can realize compound action (that is, the punch can bend the workpiece twice or more when it goes down once), which has high efficiency and can also reduce the friction between the mold and the workpiece, which is beneficial to avoid or reduce the friction between the mold and the workpiece. damage; but the die structure is more complex

[0023] Checking the existing literature, no segmented oscillating die is used for deep drawing. The fundamental reason is that the segmented oscillating die can only be used for forming (bending) developable curved surfaces, not for forming (deep drawing) of non-developable curved surfaces. ; There is no overall swing die for deep drawing

[0024] To sum up, in the existing technology for forming slanted bottom dishes, the splicing and forming integrity is poor, the shape precision of the workpiece is not high, and the production efficiency is low; the conventional mold is drawn deep, the punch and the die move in a straight line relative to each other, and the convex and concave molds move in a straight line at the initial stage of forming. The contact area between the mold and the blank is small, the dome of the part is easy to thin, and the initial contact area of ​​the ring is easy to wrinkle; liquid-filled deep drawing and liquid punch deep drawing have high requirements on equipment, and it takes a lot of money to clean the adhesion on the part. Liquid; bulging will cause the thickness of the part to be significantly thinner, and the degree of deformation is limited; the thickness of the part obtained by incremental forming and multi-point forming is also significantly thinner, and the shape accuracy is limited, and the efficiency is not high

The existing swing punch is difficult to adapt to small and medium-sized workpieces, and it has not been used for deep drawing of Class C inclined bottom dishes; the pendulum die can be used for bending, but not for deep drawing

[0025] In a word, it is difficult to easily and reliably obtain sloping-bottom dishes with insignificant thickness reduction by using existing methods and molds with existing structures, especially it is difficult to easily and reliably obtain Class C sloping-bottom dishes with inconspicuous thickness reduction.

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