The method of manufacturing of non-ferrous metals and alloys parts with two cavities

 

(57) Abstract:

Usage: ways of making cold extrusion of non-ferrous metals and alloys parts with two cavities, one of which has a thin wall. The inventive when working stroke of the press slide one punch form a thin-walled cavity, and the other thick-walled with an inner annular projections of a certain size. Upon return of the slide to its original position eat produce parts with punch and simultaneously eliminate these annular projections, calibrating a side surface of a thick-walled cavity. 4 Il.

The invention relates to the processing of metals by pressure, and in particular to methods of manufacturing a cold extrusion of non-ferrous metals and alloys parts with two cavities, one of which is thin-walled.

A known method of manufacturing parts with two cavities, formatted sequential extrusion [1].

The disadvantages of this method include the presence of two operations of the extrusion and the inability to manufacture parts with thin wall non-ferrous metals, since the removal of parts from punch thin wall loses its stability and crushed. In addition, the presence Tr also a method of manufacturing parts by simultaneous extrusion of two cavities [2].

The method has several disadvantages. It is unsuitable for extrusion of thin-walled cavities in the parts made of nonferrous metals and alloys, since the removal of parts with punch after deformation is crumbling wall. In addition, the use of tube pullers accompanied by an increase in the length of the punch and the decrease in its strength, and core - complicates the design of the stamp and increases the complexity of manufacture and adjustment.

The invention solves the problem of manufacturing the extrusion of non-ferrous metals and alloys parts with two cavities, one of which is thin-walled. The problem is solved as follows. When working stroke of the press slide one punch form a thin-walled cavity, and the other thick-walled with an inner annular projections diameter (0,986-0,997) D and radius (0,23-0,30) D, where D is the diameter of the thick-walled cavity, and the total area of the annular projections is equal to (2-4) F, where F is the area of the side surface of the working portion of the punch forming thin-walled cavity, and when the return of the press slide to its original position eat produce parts with punch and eliminate these annular projections, calibrating a side surface of a thick-walled cavity.

Sushestvennuyu. Thin-walled cavity is formed by a single punch, and thick - other, on the side surface of which is made annular groove is filled with metal during deformation. When reverse motion of the press slide metal, saakshi in grooves keeps the item on the punch and, playing the role of a stripper, removes it from the plug, forming a thin-walled cavity. Upon further movement of the press slide carry out taking part with a punch, while eliminating the annular projections and calibrating thick-walled cavity.

In Fig.1 is a diagram of a stamp to realize the proposed technical solution; Fig.2 - the material after extrusion cavity; Fig. 3 - the item after removal from the punches and elimination of annular projections calibration the side surface of the thick-walled cavity; Fig.4 - profile of the working part of the plug, forming a thick-walled cavity.

Legend: 1 - stamped item (product), 2 - punch forming thin-walled cavity (according to Fig. the lower punch), 3 - punch, forming a thick-walled cavity (upper plug), 4 - ring groove on the plug, 5 - sleeve, 6 matrix 7 - the mobile plate.

The proposed method for the manufacture of Svetlana press (not shown), and the sleeve 5 to the movable plate 7. In matrix 6 on the plug 2 is pushed by the workpiece and turn the press. The slider moves down and moves the sliding plate 7, and the sleeve 5 is included in the matrix 6. Is bilateral extrusion cavities details of the punches 2 and 3. It is known that metal lighter forms a thick-walled (Fig.1 - top) than thin (bottom) cavity.

The sleeve 5 is pressed on the end face of the semi-finished product, and together with the plunger 3 moves the metal down, making the bottom, thin-walled cavity. Punch 3 on your side of the working surface has an annular groove 4, in which flows the metal during extrusion. Thus, in the bottom position of the press slide item 1 has two cavity - walled (bottom) and thick (top), and in the upper cavity in a workpiece formed annular projections placed in the annular grooves 4 of the plug 3. When the press slide up the metal, saakshi in the annular groove securely holds the cake mix on the top plug and remove it from the lower punch, fixing on top. Upon further movement of the press slide, the plate 7 stops its motion and the sleeve 5, is attached to the plate 7, removes item 1 with the upper punch. Simultaneously with the withdrawal /P> The authors experimentally during extrusion of parts of two standard sizes of various non-ferrous alloys (AD, AD1) were installed size drillings on the punches, which was worked out taking into account the elastic deformation of the workpiece material, the stress of removing the items from the lower punch and the subsequent calibration of the internal surface of the cavity when removing items from the top of the punch.

Thus, the authors found that the diameter d of the annular projections is equal to (0,986-0,997) D, where D is the diameter of the upper cavity. At higher values the item is not removed from the bottom of the punch, and at smaller values when the removal of parts from the upper punch and the calibration cavity surface was observed distortion of the geometry of the upper side of the part. The radius of annular protrusions is equal to (0,23-0,30) D. At smaller values of the radius of the saw cut metal when removing items from the top of the punch, and at large values of the item was removed from the bottom of the punch.

The total area of the annular projections is equal to (2-4) F, where F is the area of the side surface of the working part of the lower punch forming thin-walled cavity. At lower values the item is not removed from the bottom of the punch, and at large values required to make patient decisions.

Detail of "glass" (Fig. 3) product SOP-40 is stamped from alloy AT or AD1. The semi-finished product (Fig.2) receive bilateral squeezing at the end of the stroke of the press slide in the stamp, the scheme of which is shown in Fig.1. In a thick-walled upper region is formed circular protrusions tool, profile and dimensions of the working part of which is shown in Fig.4. After removal from the upper punch and calibration of the internal lateral surface of the cavity to receive the item (Fig.3). The height of the working band on the lower punch is equal to 1 mm

The METHOD of MANUFACTURING of non-FERROUS METALS AND ALLOYS PARTS WITH TWO CAVITIES, including the calibration of the ends of the billet, extrusion of the two cavities simultaneously by two punches, characterized in that when working stroke of the press slide one punch form a thin-walled cavity, and the other thick-walled with an inner annular projections diameter (0,986 - 0,997) D and radius (0,23 - 0,30) D, where D is the diameter of the thick-walled cavity, and the total area of the annular projections is equal to (2 - 4) F, where F is the area of the side surface of the working portion of the punch forming thin-walled cavity, and when you return to the press slide to its original position eat produce parts with punch and although the

 

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