RU2693707C1 - Method of thin-sheet cylindrical workpieces manufacturing from strip rolled stock and device for its implementation - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention relates to production of round metal workpieces from square billet. Billet is placed in round matrix. Workpiece is settled by reverse die skipping between rolls. Said matrix omissions are made in mutually perpendicular directions, which ensures filling of the whole matrix volume with metal. Matrix forms two groups of parts contacting each other through an elastic ring-damper and a lenticular element. One set of parts comprises a ring and a puncheon articulated therewith with a sliding fit. Puncheon diameter is equal to matrix diagonal. Other group of parts comprises ring and support plate.

EFFECT: improved quality of blanks due to increased accuracy of their manufacture.

5 cl, 3 dwg

Description

The invention relates to the production of round metal billets for subsequent embossing and sheet metal stamping.

A known method of producing thin sheet metal blanks from a sheet or roll, including multi-row cutting of blanks in a staggered order and their cutting with curly knives, partially repeating the contour of blanks cut, with each subsequent cut with scissors carried out after displacing the sheet or knife by half the step of blanks (see for example, application 2011111230, B21D 28/00 of February 24, 2011).

The main disadvantage of this method is the need to strictly ensure the normalized displacement of the sheet or strip before each cut. Violation of this condition leads to increased metal losses in the process of implementing the method.

There is a method of low-waste cutting of metal blanks from a card, including a segment of a square or rectangular card from a sheet, strip or roll, and subsequent cutting by a punch from this card of a blank with a cross-section in the form of a circle or polygon (see, for example, patent 2308343, B21D 28/02 dated July 18, 2005).

The main disadvantage of this method is the increased loss of metal with trimmings.

A known method of manufacturing thin-sheet cylindrical blanks from strip steel, including a square piece in plan, the volume of which is equal to the volume of cylindrical billet produced, and a diagonal equal to the diameter of the cavity of the closed matrix, placing the blank in the specified matrix and plastic deformation of the workpiece by draft [see, for example, Production of precision blanks for cutting and logging // KShP-OMD, 2005, No. 9, p. 22-24].

On the totality of the implemented methods of implementation, the known method is closest to the proposed method of manufacturing thin-sheet cylindrical strip blanks, therefore, adopted as a prototype.

The main disadvantage of this method is the need to implement elevated pressures at the final stage of precipitation, which significantly reduces the efficiency of the tool, in addition, the precipitation method significantly reduces the productivity of the production process.

The proposed method of manufacturing thin-sheet cylindrical blanks from rolled strip is free from this drawback, since the composite method for its implementation is the most effective method of metal processing by pressure - rolling.

These technical results are achieved due to the fact that in a known method of manufacturing thin-sheet cylindrical blanks from rolled strip, including a segment of a square in the plan, the volume of which is equal to the volume of the round semi-finished product being produced, and a diagonal equal to the diameter of the cavity of the closed matrix, placing the blank in the specified matrix and plastic deformation of the workpiece draft, according to the invention is carried out by reversing the pass matrix with forming the workpiece elements between y rolling rollers, wherein the workpiece size is controlled precipitation in the pauses by changing the gap between the rolls.

In addition, the difference in the conditions of metal flow during the upsetting of the billet by rolling rollers from the conditions of its precipitation by flat strikers eliminates, firstly, the elastic deformation of one of the elements forming the matrix, secondly, using gaps in the matrix with the billet between the rollers in mutually perpendicular directions. At the same time, the initial and last blanks of the die with elements forming the workpiece between the rolling rolls are carried out at a constant roll gap.

The implementation of the developed method is carried out using the following device.

The device for implementing the method of manufacturing thin-sheet cylindrical blanks from rolled strip contains a matrix, which is formed by two groups of parts in contact with each other through an elastic shock absorber ring and a lenticular element, while one group of parts contains a ring and a punch jointed with it along a sliding fit whose diameter is equal to the diameter of the matrix, another group of parts contains a ring and a base plate, with the listed parts, a shock absorber ring and a lens-shaped element t have a common symmetry axis.

The working surfaces of the lenticular element are formed by the same radii with centers on the vertical axis of symmetry of the device.

The proposed method of manufacturing thin-sheet cylindrical strip blanks and a device for its implementation are illustrated in FIG. 1-3. FIG. 1 and 2 show the basic techniques for implementing the method. Of these figures and FIG. 3 follow the clarification of the outlines of the basic structural elements of the device that implements this method. In addition, in FIG. 1 and 2 show two variants of arrangement of the main elements of the device when the device symmetry O ₁ O ₂ axis coincides with the vertical axis O _in connecting the centers of the cross sections of the upper and lower rolls; in fig. 3 is a cross-section of the device, explaining the outline and articulation of these elements in plan view. FIG. 1-3 are designated: 1 - preparation; 2 - mill rolls; 3 - the upper part (punch); 4 - ring; 5 - support ring; 6 - ring; 7 - lens; 8 - elastic ring (shock absorber).

The basis of the proposed method of manufacturing thin-sheet cylindrical strip blanks is the draft of the blank 1 by reversing gaps of the matrix M with the blank between the rolls 2 in FIG. 1 and 2. The matrix M, made round, forms a set of elements 3-8, indicated in figures 1 and 2. In the process of passing this set of elements between the rollers 2, the workpiece 1 is lowered in height, reducing its thickness from H to h. In the process of this precipitation, the deformable metal forming the workpiece 1 fills the matrix M (FIG. 1-3), thereby forming the final product. Part of the marked draft precipitation (from the thickness H to the thickness h) are the ironing reversible passages of the set of elements 3-8 between the rolls 2, during which the gap between the rolls 2 does not change. These proglazhivayuschie passes matrix M with the workpiece 1 are required at the beginning and at the end of the deformation of the workpiece 1.

The flow of metal in the process of deformation by rolls differs significantly from its flow in the process of deformation by sediment. In the process of precipitation, a comprehensive flow of metal takes place, in the process of rolling the metal mainly flows in the direction of rolling.

To fill the entire volume of the matrix M with metal (Fig. 3), in the rolling process, the workpiece is deformed by passing the matrix with the workpiece in mutually perpendicular directions. At the same time, for better filling with the metal of the matrix M, the use of the passages of the workpiece 1 between the rollers 2 "in plan with its angle at an angle" is not excluded (see Fig. 3)

Use for precipitation of the workpiece 1 rolls 2 implement plastic deformation of the workpiece by vertical movement of elements 3-8 in the direction of the workpiece 1. The specified movement of elements 3-8 is carried out by contacting the combination of these elements with an arc of the surface of the rolls 2. The noted specificity of the method of deformation of the workpiece 1 means mandatory presence in the set of elements 3-8 elastic element, compensating the specified feature of the plastic deformation of the billet rolls. Such an element is the ring 8.

The matrix M is formed by the upper part of the device containing the part (punch) 3, installed with a gap H - h relative to the ring 4 and connected to this ring along a sliding fit with diameter D ₁ . Part 3 is in contact with the workpiece 1 and essentially for the workpiece 1 is a punch. Ring 4 with a diameter of D ₁ is the guide of this punch, for which it has an inner hole with a diameter of D ₁ .

The lower part of the device contains a support ring 6 having a central cylindrical protrusion with a diameter of D ₂ . The specified cylindrical protrusion of the ring 6 is in contact with the support ring 5, which is the support of the lens 7.

Lens 7 due to the contact with the ring 4 and the ring 5 in the device performs the role of a stabilizing element, flexibly connecting the movable top (parts 3 and 4) and bottom (parts 5 and 6) of the device. Since this connection is movable, the part 4 has the ability to slide, resting on the lens 7, and also to slide together with the lens 7 along its lower surface (in Figs. 1 and 2). The same possibility provides the item 5, which, in contact with the lens 7, has the ability together with the lens 7 to slide relative to the ring 4.

Thanks to the above, the lens 7 in the device is a kind of hinge connecting parts 3 and 4 with parts 5 and 6.

At the specified rolling connection (hinge) during each pass, the device containing elements 3-6 has the ability to rotate relative points O ₂ and O ₁ located on the vertical axis O _in in fig. 1 and 2. This rotation is ensured by the presence of an elastic ring 8 lying on the vertical axis O _in passing through the axes of the upper and lower rolls 2, which is elastically deformed during the passage of the workpiece through the deformation zone.

Note that the best movements in the articulation of these parts occur when making the surfaces of the lens 7 in accordance with FIG. 1. The implementation of this joint is possible with the use of sliding surfaces of the lens 7 of radius R _in + Δ ₁ + Δ ₂ from the centers O ₁ and O ₂ coinciding with the centers of the upper and lower rolls O _in .

The implementation shown in FIG. 1 articulation of elements 1-8 of the device and mill rolls implies the coincidence of the centers O _{in the} upper and lower rolls with the axes of symmetry of these elements in the process of passing the totality of the elements of the workpiece deformation zone.

The application of the method of manufacturing thin-sheet cylindrical blanks suggests, depending on the parameters H and h, an embodiment of the elements of the device that implements the method in accordance with FIG. 2. The essential difference of this embodiment of the method from FIG. 1 is to reduce the radius R, outlining the lens 7. The noted approach is interconnected with the ratio of the sizes H and h realized in the method. The need for the latter manifests itself with an increase in the deformation of the workpiece 1 (i.e. with an increase in the ratio of H and h). As the value of H - h increases, the plastic deformation of the workpiece increases, the participation of the elastic ring 8 in the implementation of the proposed method for manufacturing thin-sheet cylindrical blanks increases.

Thus, the proposed method of producing thin-sheet blanks and a device for its implementation implemented the most effective method of metal forming - rolling. The combination of the noted successfully solved the technical problem of the highly efficient manufacture of thin-sheet cylindrical strip steel billet.

Claims (5)

1. Device for the manufacture of thin-sheet round billet from a square billet, made of rolled strip, characterized in that it contains rolling rolls and a matrix that can be placed between the rolling rolls and contains a coaxially arranged ring mounted in it along a sliding fit to move and contact with the workpiece punch, the diameter of which is equal to the diameter of the matrix, a ring with a central cylindrical protrusion and a contact ring in contact with it, as well as a lens clocking with a matrix and a support ring and an elastic ring. 2. The device under item 1, in which the lens is made with working surfaces of the same radius with the centers located on the vertical axis of symmetry of the device. 3. A method of manufacturing a thin-sheet round billet from a square billet made of rolled strip, characterized in that the device is used according to claim 1 or 2, wherein a billet is placed in the matrix, the volume of which is equal to the volume of the round billet being produced, and the diagonal is equal to the diameter of the matrix cavity , and carry out the plastic deformation of the workpiece by the draft by means of joint reversible rolling of the workpiece located in the specified matrix between the rolling rollers, and the amount of plastic deformation of the reg They can be identified by changing the gap between the rolling rolls between the rolling passes. 4. The method according to p. 3, characterized in that the rolling of the matrix with the workpiece is carried out in mutually perpendicular directions. 5. The method according to p. 3, characterized in that the initial and last passes are carried out at a constant inter-roll gap.

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