A method of manufacturing hollow parts

 

The invention relates to the processing of metals by pressure and can be used to produce hollow parts by forging. Produce extrusion of the original piece punch in the matrix with the design of the bottom, sides and top end detail and the establishment of a compensation overflow. The center punch on the inner surface of the matrix. Compensation Burr formed by grooves located on the surface of the punch. Through these grooves is the air outlet items. The result is the expansion of technological capabilities of the method. 2 Il.

The invention relates to the field of metal forming and can be used to produce hollow parts by forging.

A known method of manufacturing hollow parts by extrusion of the original piece punch in the matrix with the design of the bottom part and the top end parts and the establishment of a compensation Burr, in this design the top end items carry a punch, which center on the inner surface of the matrix (Cold forging. Directory./Ed. by G. A. Navrotsky. - M.: Machinists for deburring additional mechanical machining that is not always valid from the operating conditions of the items in the machines, which reduces the technological capabilities of the method.

Another disadvantage is the possibility of the absence of air from the cavity parts, which affects the quality of performance of the cavity, an open end and securing the height of the part.

The technical result of the invention is expressed in expanding the technological capabilities of the method by providing a complete bottom end and top end detail with minimal treatment of the latter.

This is achieved in that in the method of manufacturing hollow parts, including the extrusion of the original piece punch in the matrix with the design of the bottom, sides and top, and the establishment of a compensation Burr, in this design the top end items carry a punch, which center on the inner surface of the matrix, the establishment of a compensation Burr produced by the grooves located on the surface of the punch of the conditions of access through them air from the cavity details.

The characteristic formation of the compensation Burr produced by the grooves, "located on the surface of the punch" is significant, as it provides the minute details, and its open end, and the precision of high-altitude dimensions of the part. In the prototype the sign is missing, the establishment of a compensation Burr is produced at the bottom, with the possible failure of high-quality cavity part and an open end, due to the possibility of the absence of air from the cavity part, and height details.

In Fig.1 shows stamp of the extrusion of Fig.2 - section a-a in Fig.1.

Obtained by any method of the cylindrical workpiece 1 is subjected to a preliminary shaping by extrusion punch 2 in matrix 3, forming the cavity 4, the wall 5 and the top end 6.

The change in the shape of the bottom part 7 of the workpiece 1 is derived from the ejector 8 with axial displacement. The final shaping of the workpiece 1 at the precise altitude of the dimensions of the finished parts, in particular the cavity 4, the wall 5 and the end face 6, is provided with centering punch 2 on the inner surface of the matrix 3, and the establishment of a compensation fin 9 is carried out by means of grooves 10 are located on the surface of the punch terms and conditions of access through them air from the cavity details.

The invention is industrially applicable. Proof is the fact making hollow parts: seals and enclosures performe

A method of manufacturing hollow parts, including the extrusion of the original piece punch in the matrix with the design of the bottom, sides and top end detail and the establishment of a compensation Burr, in this design the top end items carry a punch, which center on the inner surface of the matrix, characterized in that the formation of the compensation Burr produced by the grooves located on the surface of the punch of the conditions of access through them air from the cavity details.



 

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SUBSTANCE: apparatus includes supporting plate and housing with openings and duct. Punch, upper and lower stops are mounted in housing. Said stops may be in contact with blank by their flat notched surface. Movable lower stop is arranged in openings of housing and on supporting plate; it engages with said plate by its smooth surface. Hydraulic cylinder joined by its rod with lower stop is mounted on supporting plate. Upper stop is in the form of cylinder mounted in housing in such a way that it restricts together with punch inner cylindrical cavity of hydraulic system providing motion of lower stop. Said hydraulic system also includes duct of housing and hydraulic cylinder.

EFFECT: enlarged manufacturing possibilities of apparatus due to increased range of changing relation of shear deformation to compression deformation of blank.

2 dwg

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