A method of manufacturing a hollow stepped parts with a flange in the middle part and the inner annular protrusion on the flange

 

(57) Abstract:

Usage: metal forming, fabrication of parts with deep stepped cavity with an internal annular ledge and a stepped outer surface with a flange in the area of the annular protrusion, such as buildings valves-car cameras. The essence: a cylindrical workpiece sequentially plastically deform, making the outer surface and the flange, and then machined. First stitch in the workpiece hole, equal to the cavity part on the flange, then the direct extrusion of profiled mandrel execute simultaneously external and internal surface detail from the lower end of the flange, and then reducing with the mandrel from the upper end and rebuff in the flange, making at the same time the rest of the part surface, the flange and an inner annular ledge. 5 Il.

The invention relates to the processing of metals by pressure and can be used in the manufacture of parts with deep stepped cavity with a jumper and a stepped outer surface with a flange in the area of jumpers, such as buildings valves car cameras.

There is a method of manufacturing the outer and inner surfaces (1).

The disadvantage of this method is the considerable complexity of the die tooling.

A known method of manufacturing a hollow stepped parts with a flange in the middle part and the inner annular protrusion on the flange, which consists in the fact that the cylindrical workpiece sequentially plastically deform, making the outer surface and the flange, then machined (2).

The disadvantage of this method is the low utilization rate of material and poor performance, due to the use of mechanical processing to produce deep stepped cavity with a jumper.

The technical result achieved by the present invention is to reduce material consumption and improve performance.

This is achieved in that in the method of manufacturing a hollow stepped parts with a flange in the middle part and the inner annular protrusion on the flange, which consists in the fact that the cylindrical workpiece sequentially plastically deform, making the outer surface of the part and the flange, then machined, pre stocking stitch hole equal to the diameter of cavity details on the flange, then direct wydanego end flange, then reduce with the mandrel from the upper end and precipitated in the flange, making at the same time the rest of the part surface, the flange and an inner annular ledge.

In Fig. 1 presents the original cylindrical blank; Fig.2 - tubular blank is punched bottom of Fig.3 is blank after the direct extrusion from the bottom edge; and Fig.4 - procurement after punching from the side of the upper end of Fig.5 - the finished item.

The method is as follows.

Cylindrical blank 1 (Fig.1) with a diameter of 2, equal to the diameter of the flange parts (Fig.5) equal to her volume with regard to waste, riddled with bridging 3 (Fig.2), which removes the waste punch. Thus, receive the tubular workpiece (Fig.2) with an outer diameter of D3equal to the diameter of the flange parts (Fig.5) and an inner diameter of d3equal to the diameter dn(Fig.5) of the cavity in the flange.

Next, the tubular blank is punched by direct extrusion speed punch holder 4 (Fig. 3) in the matrix 5. Receive simultaneously formed from the lower end to the flange of the workpiece 6. Remove the workpiece from the matrix by means of the ejector 7.

is changed and the speed of longitudinal expiration metal, therefore, the longitudinal dimensions of the speed of the punch - frame perform, on the basis of the following dependencies

ho= h, where habout- length speed-punch-clamps (Fig.3);

D - outer diameter of the part in the stage area (diameter points of the matrix);

d - hole diameter (mandrel) in place of the step;

D3- outer diameter of a tubular workpiece (Fig.2);

d3- inner diameter of a tubular workpiece;

h is the length of the steps in detail (Fig.3).

While direct extrusion is the radial compression of the metal punch-holder and the simultaneous appearance of the external and internal surfaces of the part. The top step of the punch-frame issue diameter dn(Fig.3), is equal to the diameter of the cavity of the part (Fig.5).

On the next transition of the workpiece 8 (Fig.4) set in a matrix of 9 with emphasis on the ejector 10 and the flange parts (Fig.5), reducing the punch 11 installed until it stops at the end And the mandrel 12 for several transitions, to determine the amount of deformation of the terms of the longitudinal stability of the workpiece. At the last transition of the reduction in the end produce a closed draught of the workpiece in the area of the flange 1, and the mandrel 12 moves with the punch.

Thus, one of the 15 items (Fig. 5). Then, mechanically treated, which consists in threading the outer 16 and inner 17.

P R I m e R (implementation).

The method is used in the manufacture of the valve body LK-35 for car cameras. Body material - brass L-63, pre-annealed calibrated rod diameter 8,55 mm cut into pieces with a length of 20.5 mm, then the combined extrusion manufactures nut dimensions outer diameter of 8.6 mm, internal 4.5 mm and a length of 27 mm from the bottom. The bottom stitch. The obtained tubular workpiece is subjected to direct extrusion speed punch, receiving the workpiece with dimensions corresponding to the dimensions of the part from the lower end of the flange. Then reduce the workpiece and two transition installed into the hole until it stops at the end of the mandrel with the other hand and draw the outer surface, the flange and the inner surface of the part and the inner annular ledge, with the final design of internal ledge and parts occurs at the end of last activity reduction due to precipitation of the workpiece in the area of the flange.

Thus, compared with the prototype of the proposed method allows to obtain a quality item with slightly is moved utilization of material with improved performance.

A method of MANUFACTURING a HOLLOW STEPPED PARTS WITH a FLANGE IN the MIDDLE PART AND the INNER ANNULAR PROTRUSION on the FLANGE, which consists in the fact that the cylindrical workpiece sequentially plastically deform, making the outer surface and the flange, then machined, characterized in that the pre in stocking stitch hole equal to the diameter of cavity details on the flange, then the direct extrusion of profiled mandrel execute simultaneously external and internal surface detail from the lower end of the flange, and then reducing with the mandrel from the upper end and rebuff in the flange, making at the same time the rest of the part surface, the flange and an inner annular ledge.

 

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