Procedure for shaping box and tube-like items with lugs and punch for implementation of this procedure

FIELD: metallurgy.

SUBSTANCE: invention refers to metal forming operations and can be implemented at various branches of industry (machine building, ship building etc) at fabrication of box and tube-like items out of sheet metal and tubes. The procedure consists in bending sheet work-piece per several passes. Lengthwise edges are alternately bent at the first pass. During the second pass the work-piece is bent from each bent lengthwise edge to the middle of the work-piece. Simultaneously there are formed specified curvature and lugs in lengthwise direction. Further, the middle part of the work piece is bent in cross direction. During successive passes lugs from one side of the work-piece to its middle are bent from edges made at the first pass. The same is made from the other end to the middle of the work-piece with increase of applied load to a maximal in the middle part of the work-piece. The punch consists of interacting upper and lower deforming units in form of a puncheon and matrix. Working surfaces of the puncheon and matrix correspond to cross and lengthwise section of item by shape. The puncheon and the matrix are made with lugs corresponding to lugs on items and with recesses. The recesses are located between the lugs and do not contact the item.

EFFECT: reduced labour input at shaping work-pieces of big thickness and reduced consumption of material.

7 cl, 1 ex, 3 dwg

 

The invention relates to the field of metal forming and can be used in various industries like engineering, shipbuilding and so on) in the manufacture of box-shaped and tubular sheet metal and pipes.

Well-known and widely used ways of shaping sheet parts using cold deformation, as well as using local heatings (Kuklin O.S, Shebarshin VP technological equipment hull plating shops. L.: "Shipbuilding", 1988).

Currently in the industry are used in the following analogues of the proposed technical solutions using multijunction methods of forming sheet parts of complex configuration, universal and special stamps for their implementation, namely: inventions by A.S.№№1042842, 1072951, 1194897, 1250348, 1291235, 1298656 and other

Closest to the claimed is a method of forming tubular parts of the sheet and the device for its implementation by the RF patent №2250149. The way the prototype includes the bending of the workpiece by means of its rotary-local deformation, attached parallel to the longitudinal edges of the workpiece, the bending start with alternate bended form longitudinal edges, and then make subsequent step-by-step bending of the workpiece from each p is dognuts edge to the middle of the billet.

Device for forming tubular parts of the sheet at the specified prototype contains interactive deforming the upper and lower nodes, with the upper deforming unit is designed in the form of the pressure roller device with the possibility of reciprocating movement in a vertical plane, and the bottom deforming unit is designed in the form of a supported beam.

The above method and apparatus can be applied using a special bending-straightening machines with drive rollers, at present, however, such machines are available only for a relatively small effort (up to 25 TC) and, consequently, they can get the items only from wood thickness up to 20 mm

The present invention is the provision of forming a complex hard-of double curvature components of pieces of large thickness requires the thinning of the workpiece, using traditional forging equipment and acceptable performance, economy of material of workpieces, as well as expanding Arsenal of technical means used in the molding of parts.

The technical result provided by the present invention is to reduce the complexity and increase the efficiency of forming hard parts dual krivis the s of pieces of large thickness when using traditional forging equipment, and reduction in material consumption.

This effect is achieved by the execution sequence forming on transitions to prevent homeopathy by applying drawing and creating technologically necessary thinning at the established patterns of distribution along the length of the part of double curvature. In hard areas of the workpiece can be used for local heating, which reduces the elastic aftereffect and obtaining the required thinning without unwanted side strain.

Flexible parts is carried out for several transitions. On the first transition are pogibko edges to the tubular parts of the cylindrical surface, for box - rectilinear form.

On the second transition are bending from each bent longitudinal edges to the middle of the workpiece with the formation of a given length of the projections. Moreover, the protrusions when bending receive a curvature in the longitudinal and transverse directions. With significant dimensions of the parts bending produced sequentially from one edge to the middle part, and then from the second edge to the middle part. And on the second transition shall forming protrusions incomplete profile.

At the next transition produce the final bending from one longitudinal Kronk is to the middle of the workpiece, and then from the other edge to the middle part of obtaining a given shape of the protrusion and a given transverse curvature of the part. The final bending exercise on the Central line items.

The invention is illustrated by the schemes in relation to the manufacture of the coupling fillet for repair of the corrugation of existing pipelines (TU 1469-001-01297858-01):

- figure 1 is a longitudinal section of the parts in the process of morphogenesis in stamps;

- figure 2 - cross section details the process of forming the stamp according to claim 5 of the formula of the invention (section a-a in figure 1);

- figure 3 - cross section details the process of forming the stamp on p.6-7 claims.

To explain the proposed method of forming figure 1 is shown in the stamp blank box part 1, the thickness s with technological allowance 3 and 2 shows the locations of future projections. These protrusions are formed for one to three consecutive transition in the stamp (figure 1), consisting of the punch 4 and interacting with the matrix 5. For workpieces of double curvature on the ledges details (fillets) of the punch and the matrix have their stamp protrusions with corner radii Rinand Rn(figure 2), creating a double curvature due to the thinning of the workpiece parts on the value of Δs. The necessary stretching of the preform in the longitudinal L and transverse to the Δ inthe direction depends on the geometry of the part, and the thinning is calculated as Δs=Δl-Δin. Between adjacent protrusions in the matrix and the punch stamp procurement details for the application of a force shaping will be free to increase, receiving the specified form without homeopathy.

Shaping the workpiece on the first transition (figure 3) begin with a bended form edges 3 of part 1 of obtaining a given curvature edges. The second transition is exercised by the bending of the workpiece from each of the bent longitudinal edges to the middle of the workpiece with the formation of a given curvature and protrusions in the longitudinal direction. Then take further bending the middle part of the workpiece in the transverse direction without a full education projections. On subsequent transitions form the projections obtained at the first transition edges on one side of the workpiece prior to its middle with the consistent growth efforts, up to the maximum of PII(2) in the middle of the workpiece, and then from the other edge in the same way to the middle of the workpiece parts.

In the particular case of the proposed method after forming the first parts of the same size measure the resulting extract its edges, reduce the allowance and the size of the billet parts on the amount of the allowance and then shaping the subsequent parts carried the t without technological allowance 3 (1-3).

In another particular case, if necessary, considerable hood and thinning of the workpiece (for conventional steels from 8% in places protrusions 2 figure 1-3) carry out local heating of the width of the ledge with the increase of heating temperature on the width and length of the projection from its edges to the middle, while the highest temperature for low-carbon and low-alloy steels does not exceed 800°C.

In yet another particular case, before the first transition carry out the shaping of the workpiece surface without protrusions on the cylindrical surface with the smallest set inner radius of the part or use a blank cut from a pipe.

To implement the inventive method offers the stamp shown in figure 1, containing the interacting deforming the upper and lower nodes in the form of the punch 4 and the matrix 5, the operating surfaces of which conform to the shape of the transverse and longitudinal cross-section details. The inventive stamp differs from the prototype in that areas receiving projections on the details of the punch and the matrix have corresponding protrusions and between the notches precluding contact of the punch and die with the item.

In the particular case of the proposed stamp on the side surfaces of the sensor (see figure 2) replaceable inserts, select in the formation process without removing the bending load capacity CR is pernah 7 and release 8 bolts. While working surfaces of the inserts 6 are made on the shape of the surface of the workpiece 1, and the thickness of the liners is chosen taking into account the springback of the workpiece defined by a debugging process of formation, depending on the type of material of the workpiece. For easy removal of inserts 6 have a bevel angle αVKgreater angle of friction (steel 6-8°).

In another particular case, the declared stamp matrix 5 has a slanted boundary the transverse edges with bent edges of the parts to eliminate undesirable side deformation (curvature) in areas receiving projections that we must set the bevels shims 9 (see figure 1).

As an example of the use of the proposed technical solutions figure 1-3 shows the use of them for making fillet couplings P6 (TU 1469-001-01297858-01) for repair of existing pipelines. In this case, as shown by comparative calculations of the performance of various processes of morphogenesis, including hot bending, stamping explosion, gerostamoulos and other methods, the application of the proposed method and stamps will reduce metal and energy equipment and tooling 3-5 times, while reducing unit time flexible to 3.5-4.5 hours per clutch P6 instead of 5.5-9.0 hours with other methods.

1. Method of forming box-shaped or tubular parts with tabs included is the overall bending sheet stock successive deformation for several transitions, characterized in that the first transition curve begin with alternate bended form longitudinal edges, the second transition is carried out subsequent bending of the workpiece from each of the bent longitudinal edges to the middle of the workpiece with the formation of a given curvature and protrusions in the longitudinal direction, followed by bending the middle part of the workpiece in the transverse direction, and in subsequent transitions form the projections obtained at the first transition edges on one side of the workpiece prior to its middle with the consistent growth efforts, up to the maximum in the middle part of the workpiece, and then from the other edge in the same way to the middle of the workpiece.

2. The method according to claim 1, characterized in that after forming the first part measured the resulting extract its edges and forming subsequent parts carry without technological allowances.

3. The method according to claim 1 or 2, characterized in that before the second transition in places protrusions provide local heating of the width of the ledge with increasing the heating temperature from the edges of the tabs to the middle.

4. The method according to claim 1, characterized in that before the first transition carry out the shaping of the workpiece surface without protrusions on the cylindrical surface with the smallest set inner radius of the part.

5. Stamp for fourmeau is obrazovaniya box-shaped or tubular parts with projections by the method according to claims 1 to 4, characterized in that it contains no interaction between the upper and lower deforming the nodes in the form of the punch and die, which are made with work surfaces, transverse and longitudinal sections which correspond to the transverse and longitudinal cross-section details, ledges where they get to detail and located between the tabs with the notches made with the exception of their contact with the item.

6. The stamp according to claim 5, characterized in that it has placed on the lateral surfaces of the punch and die replacement liners, which are designed formation process without removing the bending load is performed with the working surface in the form of a given workpiece surface and have a thickness that is selected to account for springback of the workpiece material.

7. The stamp according to claim 6, characterized in that the matrix is made with bevels on the edge of the transverse edges with bent edges of the parts to eliminate undesirable side strain from thinning harvesting in areas receiving projections.



 

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