A method of manufacturing a bushing with flange

 

(57) Abstract:

The invention relates to the processing of metals by pressure and can be used in the manufacture of cold die forging parts type bushing with a flange and a stepped cavity. After cutting the original piece align its ends and direct extrusion receive the cylindrical section of smaller diameter. The interface of the above-mentioned section of the workpiece with a cylindrical section of larger diameter is done on the radius. The extrusion of the billet to form an internal cavity, and through precipitation flange. Simultaneously with the formation of the flange to produce the calibration depth previously extruded inner cavity under the subsequent formation of the extruded inner cavity of smaller diameter. Then punch a hole for threading. The result is improved part quality and tool life. 1 Il.

The invention relates to the processing of metals by pressure, and in particular to methods of cold massive forming parts type bushing with a flange and a stepped internal cavities.

There is a method of cold forming elongated hollow parts, where the first p is P> and perform direct extrusion part, forming the outline of the face, then on the third position rebuff hex and squeeze the internal cavity at the ends, on the fourth position finally squeeze out of the internal cavity and form the blueprint under the punch, on the last position are punching holes (U.S. Pat. 3186209, CL 72-334).

The disadvantages of this method are:

- uneven distribution of deformation and consequently the mechanical properties of the height of the product;

low tool life on the third position when forming the cylindrical protrusion on the side of the hexagon method closed precipitation and simultaneous backward extruding the inner cavity;

- complex design of the tool and its adjustment.

The closest technical solution is a method of manufacturing a multi-faceted flange nuts with a hollow cylindrical podgotovka, the essence of which is that from the Bay dimensional cut the workpiece in the first position produce alignment of the ends with the design of the one end of the radius, then the workpiece is transferred to the second position rotated 180owhere is extruded hollow cylindric the Russian form, then the workpiece is transferred in parallel to the third position and squeeze the polyhedron to the next position of the workpiece is transferred in parallel, where rebuff the flange and finally make out the outline under the punched hole on the last position of the workpiece transfer 180owhere punch hole (RF, U.S. Pat. 2101123, CL 21 To 1/70).

The disadvantages of this method are:

- uneven distribution of deformation and consequently the mechanical properties in the cross-sections of the product, the possibility of cracking;

- complex design of the tool at the second position, and accordingly, the low resistance of the tool in the same position;

- low quality parts due to the uneven design of the flange when it is upsetting to the fourth position.

The invention solves the problem of improving the part quality and increase tool life due to more uniform distribution of strain in the cross-sections of the stamped blanks, eliminate voids and forming cracks, the optimal choice of the diameter of the original piece.

The problem is solved by the fact that in the method of manufacturing a bushing with a flange that includes a segment of the original piece with a round p the infusion and shaping by extrusion of the inner cavity, as well as education on the workpiece draught flange and punching holes for threading, according to the invention, the direct extrusion is carried out by obtaining between the cylindrical sections of the workpiece larger and smaller diameters of the surface of the coupling made according to the radius, and education on the workpiece flange is produced simultaneously with the calibration depth previously extruded inner cavity under the subsequent formation of the extruded inner cavity of smaller diameter, while the diameter Dzaginitial workpiece radius R forming the surface of the pair of cylindrical sections of larger and smaller diameters and depths h calibration internal cavity selected from h conditions:

< / BR>
R = (0,951,1)(D-d)

h = (0,90,95)H,

where D1- diameter of the bushing flange;

d - outer diameter of the cylindrical section of the sleeve of smaller diameter;

D - outer diameter of the cylindrical section of the sleeve of larger diameter;

H - the height of the cylindrical section of the sleeve of larger diameter and flange.

The invention is illustrated in the drawing.

The method is as follows.

Nut with flange made on cold-formed machine MG. About the transfer to the second position rotated 180oproduce backward extrusion of the inner cavity and the design of the outer surface of the larger cylindrical section And the sleeve, that is, a cylindrical section of larger diameter, and with the opposite end of the direct extrusion of the outer surface of the smaller cylindrical section B of the sleeve, i.e. a cylindrical section of smaller diameter, the surface of the coupling between the cylindrical sections of radius R and form a small recess. Next, the workpiece is transferred by 180oon the third position, where they are provided on the workpiece flange draught, at the same time from the opposite end of gauged by the depth of the previously extruded cavity under the subsequent formation of the extruded inner cavity of smaller diameter. On this same position with the end face of a cylindrical section of smaller diameter to calibrate the preliminary idea for punching holes for threading. On the next position of the workpiece is transferred by 180owhere squeeze the inner cavity of smaller diameter, is formed into an outer chamfer and the final blueprint for punching holes for threading on the end of the smaller cylindrical section B of the sleeve. At the last position of the workpiece, PNIA sleeve with flange provides optimal conditions of plastic deformation of the workpiece and ensures high quality products.

A method of manufacturing a bushing with a flange that includes a segment of the original piece with a circular cross section, the alignment of its ends, receiving a cylindrical section of smaller diameter direct extrusion and shaping by extrusion of the internal cavity, as well as education on the workpiece draught flange and punching holes for threading, characterized in that the direct extrusion is carried out by obtaining between the cylindrical sections of the workpiece larger and smaller diameters of the surface of the coupling made according to the radius, and education on the workpiece flange is produced simultaneously with the calibration depth previously extruded inner cavity under the subsequent formation of the extruded inner cavity of smaller diameter, when this diameter Dzaginitial workpiece radius R forming the surface of the pair of cylindrical sections of larger and smaller diameters and depths h calibration of the internal cavity are selected from conditions

< / BR>
R = (0,951,1)(D-d);

h = (0,90,95)H,

where D1- diameter of the bushing flange;

d - outer diameter of the cylindrical section of the sleeve of smaller diameter;

D - outer diameter of the cylindrical section of the sleeve of larger diameter is

 

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