RU2456113C2 - Method of concentric angular forming of barrel- or cup-type parts - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming and may be used in hammer shops for production of hollow parts. Die for concentric angular forming comprises outer container with opening mounted on press table, said opening accommodating mandrel, inner container with through channel, and driven male die. Mandrel is secured on press table. Inner container is arranged inside pouter container to displace axially and make axially symmetric impression between its end face and mandrel end face. Inner container may be pressed against thrust. Note here that thrust vertical position may be adjusted relative to press table and locked at said position by appropriate structural element.

EFFECT: optimum metal structure of finished article.

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Description

The present invention relates to the processing of metals by pressure and can be used in the forge shops of metallurgical and engineering plants in the manufacture of hollow parts.

A known tool for concentric angular pressing of parts such as a glass containing a container and mounted on a press table coaxial to the container of the mandrel, while the container has a through channel for the drive punch, and between the opposite ends of the pair: the container and the mandrel is formed by an axisymmetric stream (US Pat. US No. 3263468 Cl. 72-267, publ. 1966).

A disadvantage of the known tool is the difficulty in ensuring the desired quality of the finished parts due to insufficient rational structure during deformation, which impairs the strength characteristics of the parts under conditions of their loading under extreme conditions.

A stamp is known that contains an outer container and a mandrel mounted on the press table in the hole of this container, as well as an inner container mounted with the possibility of axial movement along this container with a through channel for the drive punch, while between the opposite ends of the pair: the inner container and the mandrel are formed by an axisymmetric stream (Production of axisymmetric shells with intensification of shear strain. Basyuk S.T. Levochkin SB, Grinberg I.V. Light alloy technology, No. 3, 2009, pp. 110-115 - prototype).

A disadvantage of the known stamp is that the initial dimensions in the axial direction of the axisymmetric stream correspond to the axial dimensions of this part of the finished part. This circumstance narrows down the technological capabilities in the initial stage of deformation of the initial billet and, accordingly, does not provide a rational structure.

The proposed stamp for concentric angular pressing of parts such as cups or bowls contains an external container mounted on the press table with an opening, mounted on the press table and placed in the hole of the said outer container, the mandrel, an inner container with a through channel mounted inside the outer container with the possibility of axial movement and formation between its end and end the mandrel of an axisymmetric stream, and a drive punch placed in the through channel of the inner container.

The proposed stamp is characterized in that the inner container is made to be pressed against a stop made with the possibility of adjusting its vertical position relative to the press table and fixing in this position by means of a force element for axially adjusting the initial dimensions of the axisymmetric stream.

The technical result of the invention is the ability to set in the initial position the axial dimensions of the said stream, larger than the corresponding dimensions of the bottom of the finished part, and, accordingly, provides a rational structure, that is, an increase in the quality of the finished parts.

The invention is illustrated by drawings, which show the stages of the hot stamping of parts.

For a part without an additional section of the annular wall:

figure 1 - left - the beginning of the first stage;

on the right - the end of the first stage and the beginning of the second stage;

figure 2 - left - the end of the second stage and the beginning of the third stage;

on the right is the end of the third stage.

For parts with an additional section of the annular wall:

figure 3 - on the left is the beginning of the first stage;

on the right - the end of the first stage and the beginning of the second stage;

figure 4 - left - the end of the second stage and the beginning of the third stage;

on the right is the end of the third stage.

In the embodiment of the manufacture of a bowl type part 1 (FIG. 2) from the initial blank 2, the stamp comprises an outer mandrel 4 mounted on the press table 3 and an outer container 5 mounted on the press table. Inside the container 5, an axial container 6 with a through channel is mounted for axial movement for placement of the workpiece 2. The mandrel 4 is placed in the opening of the container 5. The drive punch 7 is placed in the channel of the container 6. To fix the container 6 in the upper position in the axial direction by the force Pk, pressing it against the abutment 8, a power element is provided nt (spring 9). This position can be adjusted vertically by link 10 relative to the press table, and accordingly, the initial dimensions are provided in the axial direction of the axisymmetric stream between the opposite ends of the pair: inner container 6 and mandrel 4. Stop force Ru> Pk.

Examples of the manufacture of parts illustrate the functioning of the elements of the stamp.

Examples.

1. We made a part 1 of a bowl type (Fig. 2) with an outer diameter of Dн = 450 mm and an inner diameter of Dвн = 360 mm from AK-6 aluminum alloy. The initial prepared blank 2 had a diameter of D = 350 mm. The latter was heated and placed in the through channel of the container 6. When Pk is applied to the punch 7, the first stage of formation of the intermediate preform begins: the preform 2 material is deposited on the mandrel 4 with the formation at the end of the preform 2 thickenings 11 in the area adjacent to the mandrel 4. The formation of a thickening 11 in said axisymmetric stream leads to the appearance of a force Po acting on the container 6 in the direction opposite to the direction of the force Pk. When the magnitude of the force Po exceeds the magnitude of the force Pk, the container 6 "pops up." In this case, in the thickening 11, the conditions of comprehensive compression are provided. This is the beginning of the second stage. At this stage, the formation of the punch 7 on the mandrel 4 is completed with the simultaneous application in the zone of large diameters of the formed washer 12 through the container 6 of the force Pk in the same direction as the force Pn. In this case, the overall diametrical dimensions D of the washer 12 are limited by the inner surface of the opening of the container 5. The “pop-up” container 6 ceases to contact the stop 8. This stage ends when the stop 13 reaches the counter surface of the slider 14 on which the punch 7. is mounted. In the third stage, the punch is moved together 7 and the container 6 extruded the annular wall 15 of the bowl type part 1 from the washer 12. The wall 15 was extruded into an annular gap limited by the surfaces of rotation: from the inside - the outer surface of the inner con eynera 6, outside - the inner surface of the outer container 5. At the end of this phase emphasis 8 "recessed" inner container 6 and clearance occurs final shape and dimensions of the finished part 1 type bowl. The design of the experimental stamp provided the opportunity (not shown) to extract the finished part.

2. A piece 16 of a glass type was made (Fig. 4) with an outer diameter of Db = 430 mm and an inner diameter of Db = 360 mm from a MA2-1 magnesium alloy.

The initial preform had a diameter of D = 300 mm.

Hot concentric angular pressing of the heated initial billet was carried out similarly to that described in the previous example, but in the third stage, simultaneously with the formation of reverse extrusion of the annular wall 15 by direct extrusion, an additional section of this wall was formed in the annular gap formed by the rotation surfaces: from the inside - the outer surface of the mandrel 17, from the outside - the inner surface of the outer container 5.

Thus, the proposed method can improve the quality of the parts due to the intensification of shear deformations.

Claims (1)

A stamp for concentric angular pressing of parts such as glasses or cups, comprising an outer container mounted on a press table with an opening, mounted on a press table and placed in a hole of said outer container, a mandrel, an inner container with a through channel mounted inside the outer container with the possibility of axial movement and formation between its end and end the mandrel of an axisymmetric stream, and a drive punch located in the through channel of the inner container, characterized in that The early container is made with the possibility of pressing it against a stop, made with the possibility of regulating its vertical position relative to the press table and fixing in this position by means of a power element for axially adjusting the initial dimensions of the axisymmetric stream.

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