RU2025190C1 - Method of manufacturing sleeve-type parts - Google Patents

Abstract

FIELD: plastic working of metals. SUBSTANCE: method involves producing part in a single working stroke of press. Intermediate billet is at first produced by direct extrusion through die onto mandrel with reduced friction force on outer surface of extruded portion of intermediate billet, with part of its bottom being left in die. Then billet walls are calibrated by acting on billet in opposite direction by mandrel. EFFECT: high quality of parts and increased efficiency of method. 3 cl, 2 dwg

Description

 The invention relates to the processing of metals by pressure, and in particular to a technology for manufacturing hollow parts such as a glass.

 A known method of producing parts such as a glass, for example, by direct extrusion of a workpiece onto a mandrel. To reduce the friction forces arising in the annular gap between the extruded workpiece, the matrix walls and the mandrel, a lubricant is introduced [1].

 However, when squeezing long, thin-walled parts or parts from difficult-to-deform materials, a decrease in the friction forces by means of lubrication is not enough; an increase in the deformation force can lead to breakage of the tool or the need for a multi-transition process arises, which leads to a decrease in productivity.

 The closest technical solution to the invention is a method for producing parts such as glasses, which consists in the manufacture of an intermediate workpiece and its subsequent calibration [2].

 The disadvantages of this method are the presence of friction surfaces that increase during the deformation process, which increases the specific loads on the stamping tool and the need to obtain a thick-walled cup for combined extrusion at a separate transition. In addition, using this method, it is impossible to obtain parts such as a glass from hardly deformable materials, as well as parts with an equal bottom and wall.

 The technical result provided by the invention is to reduce the specific load on the tool, as a result of which it is possible to obtain long thin-walled parts, as well as parts from difficult to deform materials.

 This is achieved by the fact that in the method of producing parts such as a cup, which consists in the manufacture of an intermediate preform and its subsequent calibration, the process is carried out in one working stroke of the press, and the intermediate preform is obtained by directly extruding the material from the matrix onto the mandrel, during which the friction forces on the outer the surface of the extruded part of the intermediate preform, leaving part of its bottom in the matrix, and calibration is performed by acting on the intermediate preform with a mandrel in the opposite direction. Calibration is carried out by a hood with thinning or crimping.

 Figure 1 presents a diagram of the manufacture of an intermediate billet (left - the beginning, right - the end of the process); figure 2 is a diagram of the manufacture of calibration (hood with the installation).

 The method is as follows.

 The initial blank in the form of a round cylindrical part is cut from the rod, placed in the container of the matrix 1 and deformed by the punch 2 on the mandrel 3 by direct extrusion through an annular gap formed by the edges of the matrix and mandrel. The size of the gap, i.e. the wall thickness of the intermediate preform is determined by the conditions for the subsequent calibration operation, for example by drawing with thinning or crimping.

 When extruding, friction forces are reduced from the outer surface of the extruded part of the intermediate preform by reducing the contact surface between the outer surface of the preform and the matrix, i.e. the extruded part of the workpiece from the outer surface is not limited by the walls of the matrix. The metal, having left the radius part of the mandrel 3, also does not come into contact with its lateral surface and flows freely along it.

 The extrusion process is completed at the moment when the bottom of a given value is obtained, moreover, part of the bottom of the formed cup is left in the matrix, and the calibration is carried out directly after extrusion. The deformation condition during calibration (for example, a hood with thinning) is favorably affected by heating the workpiece in the previous operation and maintaining the focus of plastic deformation. In addition, there is no need to center the instrument during calibration.

 When the punch 2 is idle, the mandrel 3 is assigned the role of the punch, which is used to carry out the calibration operation, for example, by means of a drawing with refinement or crimping. Matrix acts as a gauge matrix.

PRI me R 1. Obtaining a stamped billet D _ext = 11.8 mm, D _n = 14.2 mm, N = 71.6-75.6 mm, a blind hole depth of 27-31 mm from steel 20 was carried out on the press of the D2430B brand. To implement the proposed method using the original billet D = 14 mm, H = 54 mm, cut off from the bar. The initial preform is placed in a matrix container with a diametral gap of 0.2 mm, while the preform rests on a mandrel.

During the working stroke of the punch 2, the workpiece is deformed through the annular gap between the edges of the matrix and the mandrel to form a cup, a part of the bottom of which is located in the matrix. The resulting intermediate preform has the following dimensions: D = 11,05-11,45 _ext. D _n = 14.45-14.85 mm, N = 61-65 mm, depth of the blind hole 18-22 mm.

 After receiving the intermediate billet in one stroke of the press, a calibration operation is carried out - drawing with thinning to the specified dimensions of the stamped billet.

 Before the deformation process, the initial billet is dipped in a metal-clad lubricant with the addition of water-based SM14-M copper powder, which involves the preparation of the surface of the workpiece before stamping.

PRI me R 2. By the proposed method, from the initial billet D = 5 mm and a height H = 8 mm from steel 16XCH received an intermediate billet D _ext = 3.5 mm; D _n = 6.1 mm, H = 9 mm and a blind hole depth of 5.5 mm. After direct extrusion, calibration is performed by crimping the walls of the glass.

 The method significantly reduces the specific load on the tool. This makes it possible to produce long, thin-walled parts and parts from difficult to deform materials.

Claims (3)

 1. METHOD FOR PRODUCING DETAILS OF TYPE "STAKAN", which consists in manufacturing an intermediate workpiece and its subsequent calibration, characterized in that the process is carried out in one working stroke of the press, and the intermediate workpiece is obtained by directly extruding the material from the matrix onto the mandrel, during which friction forces are reduced on the outer surface of the extruded part of the intermediate preform, leaving part of its bottom in the matrix, and calibration is performed by acting on the intermediate preform with a mandrel in the opposite direction.  2. The method according to claim 1, characterized in that the calibration is carried out by hood with thinning.  3. The method according to claim 1, characterized in that the calibration is carried out by crimping.

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