RU2498876C2 - Method of making brake hose nozzle body blank - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming and may be used for production of parts like brake hose nozzles. After straightening of blank ends, smaller-diameter section is directly extruded at the blank. Then, indirect extrusion is used to form inner cavity. At the next forming position, flange is swaged at the blank and, at a time, conical bearing surface is headed at inclination to blank axis making at least 5 degrees. Then, smaller-diameter inner cavity is extruded and said flange is cut to hexahedron.

EFFECT: higher quality of finished products.

1 dwg

Description

The invention relates to the processing of metals by pressure and can be used in the manufacture of cold stamping parts such as tip of brake hoses.

A known method of cold deformation of elongated hollow parts, in which a measured workpiece is cut, at the first position, the ends are extruded with an external chamfer on one of them, then the workpiece is transferred to the second position and direct extrusion of a smaller diameter section is obtained to obtain internal chamfers on both ends, then the workpiece is transferred to the third position, where the internal recess is extruded from the side of the smaller diameter section, then the workpiece is transferred to the next position ju and perform reverse extrusion of the inner recess from the back side to obtain a hollow cylindrical rod, then at the fifth position, a through inner recess is finally formed in the central part of the workpiece (Korea Pat. No. 20070014246, class B21K 1/16).

The disadvantages of this method are:

- the presence of a flat area on the tool with direct extrusion of a section of a smaller outer diameter of the workpiece in the second position leads to the formation of a rupture of fibers and the appearance of stamping cracks in the above section, the convexity of the end face of a smaller diameter and poor-quality imprints of the inner bevel;

- low tool life in the third position when forming a deep inner recess and in the fourth position when extruding the inner recess with a hollow cylindrical rod protruding therein;

- the method of deformation can be carried out when forming blanks from aluminum, but not applicable in the manufacture of, for example, low-carbon steel.

The closest technical solution is a method of manufacturing a body of a tip of a brake hose, including a segment of the initial billet, aligning its ends, obtaining a cylindrical section of a smaller diameter, forming a cavity by reverse extrusion, forming a flange with a draft, and trimming a flange for a hexagon (RU No. 2428273, B21K 1/16, 09/10/2011).

The disadvantages of this method are:

- when extruding two cavities simultaneously in the fourth position, it is difficult to maintain the geometry on the workpiece itself;

- in the case of oncoming extrusion of two cavities at the same position, the resistance of extrusion tools decreases;

- the formation of folds and crushing of the walls on the workpiece from the side of the cavity of larger diameter during its reverse extrusion;

- the absence of a conical bearing surface, the so-called "dead washer", negatively affects the last operation, ie while trimming the hexagon.

The invention solves the problem of improving the quality of parts, increasing the tightness of the connection and increasing the tool life due to a more uniform distribution of deformations in sections along the height of the stamped blank, eliminating folds and stamping cracks in the inner cavity of the tip blank.

The problem is solved in that in the method of manufacturing a workpiece of the body of the tip of the brake hose, including a segment of the original workpiece, aligning its ends, obtaining a cylindrical section of a smaller diameter by extrusion, forming an internal cavity by reverse extrusion, forming a flange by sediment and then cutting it under the hexagon, according to the invention, upsetting of the flange is carried out simultaneously with the landing of the conical supporting surface with an angle of inclination to the axis of the workpiece, while the angle is chosen at least 5 °, and with its preservation at subsequent positions, and before trimming the flange under the hexagon, the inner cavity of a smaller diameter is squeezed out.

The invention is illustrated by the drawing, which shows the manufacturing process of the workpiece blank tip housing.

The method is as follows.

The blank of the tip body is made on the NH615 cold heading machine. From the rebellion, steel of grade 10U, a measured workpiece is cut off, at the first position, the ends are aligned, then the workpiece is transferred to the second position in parallel and a direct extrusion of a cylindrical section of a smaller diameter with the formation of a mark for the subsequent extrusion of the internal cavity is performed. Next, the workpiece is simultaneously transferred to the third position, where the extrusion of the inner cavity of a larger diameter is carried out. At the next position, a flange is deposited on the workpiece by sediment with the formation of a conical supporting surface with an angle of 5 °, while the previously extruded internal cavity is calibrated from the opposite end in depth. The workpiece is transferred to the fifth position in parallel, where an inner cavity of a smaller diameter is extruded and an outer chamfer is formed on a cylindrical section of a smaller diameter for subsequent thread shaping. At the last position, the hexagon is trimmed. The proposed method for manufacturing the tip body guarantees the high quality of the products obtained, ensures the tightness of the connection of the tip body in the assembly and the high resistance of forming tools.

Claims (1)

A method of manufacturing a blank of the body of the tip of the brake hose, including cutting the initial blank, aligning its ends, obtaining a cylindrical section of a smaller diameter by extrusion, forming an internal cavity by reverse extrusion, the formation of a flange by sediment and its subsequent cutting under the hexagon, characterized in that the flange is upset simultaneously with the upset conical bearing surface with an angle of inclination to the workpiece axis of at least 5 ° and maintaining it at subsequent positions, and before trimming the flange under the hexagon squeeze the inner cavity of a smaller diameter.

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