Method for shaping sheet parts, multi-function bending and straightening machine tool for performing the method

FIELD: plastic working of metals, possibly bending and straightening sheet parts of different contours.

SUBSTANCE: method comprises steps of using polyhedral rotary jibs for shaping sheet parts in addition to lower driven roller shaping member; in order to move blank to new bending lines using crane jibs; in order to hold and to reliably move worked blank using self-rolling barrel-shaped supports arranged under blank. Machine tool for performing the method includes polyhedral rotary beams having on their faces different-configuration recesses. It is possible to use inserts mounted in recesses of beams. Deforming members may be in the form of quick-changeable rollers.

EFFECT: simplified design, enlarged manufacturing possibilities.

4 cl, 3 dwg

 

The invention relates to the machining of parts with pressure and can be used for bending and straightening of sheet workpieces of various shapes.

Well-known and widely distributed for bending and straightening of sheets of the press and rotary rolling machines (rollers)that implement the processes of the element forming the elastic-plastic bending with the use of the pressure elements in the form of punches stamps or long work rolls. These processes are characterized by great efforts of morphogenesis (up to 5,000 cu) with a high level of the stock, energy and metal consumption processes, which is a significant disadvantage (Kuklin O.S, A. Sitnikov. Prospects of shaping technology in the manufacture of parts of hulls of ships. Abstracts of the III international conference "Morintech-99", SPb. 1999).

Noted disadvantages of the conventional processes flexible and bending-straightening equipment will be repaired by the application of multifunctional bending-straightening machines and machine made, using the principles of rotary-local deformation (see, for example, the patents of the Russian Federation No. 2102170 from 18.01.93; No. 2129929 from 06.08.97). However, the closest (prototype) to the claimed solution is the method of forming the bent sheet parts and bending-straightening machine for its implementation (patent RF №2191082 IPC 21 D 11/00; 11/20; /02; 7/02, publ. 20.10.2002, BI No. 29).

According to the prototype of the method of forming sheet parts rotary-local deformation of the roller forming elements in the form of an upper pressure and a lower drive rollers includes moving the workpiece, as well as its maintenance and positioning, which use positioners with thrust rollers, and the positioning is done according to the thrust roller positioners, and maintenance and move - supporting rollers.

Bending-straightening machine for forming curved sheet parts for the prototype comprises a frame and placed on her upper and lower beam, bearing respectively the upper and lower roller deforming elements, the top of which is mounted on the shaft of the power drive with the possibility of reciprocating movement in a vertical plane, the bottom is made with a rotational drive, and installed with the possibility of interaction between themselves and synchronous movement along the traverse, as well as positioners for maintaining and positioning parts. This bed is made of C-shaped, each of the positioners is made in the form of a base with a swivel frame and installed it with the possibility of reciprocating movement of the carriage on which are mounted horizontal support rollers and Vertica is Ino-resistant rollers.

According to the method and bending-straightening machine for forming axisymmetric parts used at least three positioners installed evenly spaced around the circumference relative to the workpiece. For shaping parts from the blank of elongated positioners installed with the possibility of maintaining the long sides of the workpiece. For editing and finishing of roll-formed sheet parts working surface of the lower roller deforming element is made with a smaller curvature than the top of the deforming element.

The disadvantages of the above technical solutions of the prototype, requiring further improvement, is the design complexity of the machine and mnogovershinnoe process for forming and straightening of small and medium-sized sheet parts. Therefore, the present invention is to simplify the shaping technology and equipment design, as well as the reduction of metal consumption. The solution of this problem consists in refusing positioners, as well as from and thrust rollers to maintain the workpiece. The technical result of this decision lies in the possibility of forming a more simple way and, at the same time, expanding the technological capabilities of the equipment.

This goal reaches what I provided the proposed method of forming and a multi-bending-straightening machine have the following differences from the prototype (thus taking into account the fact that according to the classification systems of the same type in the absence of the positioner device for implementing the method correct to call the machine, not the machine. Cm. "Machines of the bending-straightening multi-function on the principles of rotary-local deformation. General technical requirements". RDRL-079-2002, St. Petersburg, FSUE CRIST", 2002):

By the way:

in the process of forming in the bottom of the drive roller shaping element using a multifaceted rotating beams, the sides of which there are cavities of various shapes, plane or convex, in turn interacts with the upper deforming roller, for moving the workpiece at the transition to the new line bending is used crane, and to maintain and sustainable movement of workpiece used samosatene barrel-shaped supports, which are installed underneath the workpiece;

On the device:

- multi-function bending-straightening machine is installed at the side of the lower drive roller versatile rotary beams, the sides of which there are cavities of various shapes, plane or convex, the imp is United with alternate engagement with the upper pressure roller, axis of the upper deforming element on the carriage mounted crane moved in a horizontal plane together with him, and to maintain the workpiece installed samosatene barrel supports are placed under the workpiece.

In private cases, the decisions of the proposed device has the following differences from the prototype:

- depressions in the faces of the rotating beam is planar, in which is inserted a removable liners, interacting with the upper deforming roller;

- upper and lower deforming elements are in the form of a quick-change rollers with different radii of transverse curvature, consistently approaching a given radius of curvature of the workpiece during its rotary-local deformation taking into account the springback of the material.

The invention consists in the fact that as of the method and device adopted for the prototype, excluded maintaining and positioning the workpiece at its ends positioners with a support and thrust rollers. The sustainable maintenance and movement of the workpiece is achieved by using Samogitia barrel-shaped supports, which are installed underneath the workpiece. Bearings run directly on the floor from the movement of the workpiece, she reported actuator deforming rollers. In addition, the movement of the workpiece when the transition is on a new line bending exercise-cranes mounted on the carriage along the axis of movement of the upper deforming element and movable together with the latter when the reciprocating movement of the carriage. -Cranes with hoists is provided by moving the workpiece in both longitudinal and transverse directions.

In addition, the solution offers additional forming elements made in the form of a multi-faceted rotating beams, the sides of which holes of various shapes, plane or convex, interacting with the upper deforming roller. Fillets between the working surfaces of the faces of the beams provide an exception collapse and scratches on the surface of the workpieces. Reversal of faces deforming beams provides the expansion of technological possibilities of process and equipment.

A particular case of the solution is the implementation of the top and bottom of the deforming rollers quick and with different transverse radii of curvature that gradually approach a given radius of curvature of the workpiece during its rotary-local deformation taking into account the springback of the material.

The essence of the invention is illustrated at:

figure 1 - General view of the multifunctional bending-straightening machine;

figure 2 - cross section of a rotary deforming beams and removable liner;

F. the D.3 - side view of the multifunctional bending-straightening machine with crane beams and barrel-shaped bearings for support of the workpiece.

Multifunctional bending-straightening machine (figure 1) consists of the frame 1, including the top 2 and bottom 3 of the bar. On the upper cross beam 2 is posted carriage 4 with the actuator 5 on the shaft 6 which carries a quick-change top deforming element (pressure roller 7 with transverse radius of curvature Rp. Top deforming element 7 has the ability reciprocating movement in a vertical plane from the actuator 5 and together with the latter along the beam 2 on the carriage 4. Bottom deforming element is designed as a drive roller 8 with the rotation drive 9, and alongside it are placed on one or both sides of the rotary deforming the beam 10, having (2) deepening of various forms 11, plane or convex, which can be formed by the use of interchangeable inserts 12, interacting with the upper deforming roller 7. Between working surfaces of the faces 11 of the rotary beams and removable inserts are rounding radii rinon the mating faces 13 are selected according to the springback of the workpiece material, which is approximately 40% greater at rotary local deformation than the free bending is a result of the investment of the neutral axis of the cross-section of the workpiece from the middle line of its cross-section (research Report, GCLI-3210-028-99, SPb. FSUE CRIST", 1999).

Maintaining the workpiece 14 in the forming process is carried out (figure 3) barrel-shaped bearings 15, which are installed underneath the workpiece. The transition from one line bending to another is crane-beams 16 with hoists 17, which are mounted on the axis of the upper deforming roller 7 on the carriage 4.

Method of forming sheet parts using multi-function bending-straightening machine is as follows: sheet workpiece 14 is subjected to rotary local deformation between the upper deforming pressure roller 7 and the lower deforming element in the form of a drive roller 8, thus producing either rotary-local bending of the workpiece, if the lower roller 8 has a recess and no radial crimping of the workpiece on the roller or rotary-local bending with compression, i.e. rolling. When the position of the upper 7 and lower 8 deforming rollers shown in figure 1, is forming along the workpiece along the longitudinal lines of the bend, when you turn the top of the deforming roller 90° forming is carried out on transverse lines using a multi-faceted rotating beams, the sides of which there are a variety of deepening, plane or convex, formed, for example, a removable liner. The change of the deflection W is cooking in the area of pressure or change effort is achieved by rolling a curve of double curvature.

When the shape of the workpiece between the upper deforming roller 7 and deforming beams 10 forming the workpiece 14 is along the lines of bending across the workpiece. If beams are used with the recess 11, as a rule, is rotary-local bending across the workpiece; if there is compression of the billet in deepening or beams are used with flat or convex inserts 12, then realized the rolling of the workpiece along the transverse lines of bending. The transition from one longitudinal line of the bend to another is carried out step-by-step movement of the workpiece crane beams 16 in the direction along the workpiece, moving the carriage 4 and installed it crane-beams 16; the transition from one transverse line of bend to another by moving the workpiece in step a telpher 17 crane 16. The transition from one line bending to another is carried out at elevated upper deforming roller 15-30 mm above the surface of the workpiece. Maintaining the workpiece from sagging is semipermissive on the shop floor barrel-shaped bearings 15 mounted under procurement manual 1-3 pieces on each side of the machine depending on the size of the workpiece.

The proposed method and a multi-bending-straightening machine for its implementation do minisinoo bustamove bending and PRA the ku methods rotary-local deformation.

The proposed solutions allow you to:

to reduce the stock, material and energy intensity of processes in 6-15 times;

to simplify the design and to simultaneously expand the technological capabilities of the equipment used.

Specific decisions on the method of forming sheet parts tested on the head samples multifunctional bending-pavlinich machines MBSM-25 and EASC-30K at the shipyards S.-Petersburg and Riga. While the dimensions of the workpiece was within 3-16×1000-2000×1000-6000 mm. mm

1. Method of forming sheet parts rotary-local deformation of the deforming roller elements in the form of an upper pressure and a lower drive rollers, including maintaining and moving the workpiece, characterized in that the deformation using multi-faceted rotating beams, the sides of which there are cavities of various shapes, plane or convex, interacting with the upper roller, for moving the workpiece at the transition to the new line bending is used crane, and to maintain and sustainable movement of workpiece used samosatene barrel-shaped supports, which are installed underneath the workpiece.

2. Multifunctional bending-straightening machine for forming sheet parts containing a frame and placed on it the top and bottom roller deforming elements, the top of which is mounted on the shaft of the power drive with the possibility of reciprocating movement in vertical and horizontal planes, and the bottom is made with a rotational drive, characterized in that the side of the lower roller set with alternate engagement with the upper deforming element multifaceted rotating beams, the sides of which are made recesses of various shapes, plane or convex along the axis of movement of the upper deforming element mounted crane moved in a horizontal plane together with him, and to maintain the workpiece installed samosatene barrel support.

3. Multifunctional bending-straightening machine according to claim 2, characterized in that the facets of rotating beams made with flat recesses, into which is inserted a removable liners, interacting with the upper deforming roller.

4. Multifunctional bending-straightening machine according to claim 2, characterized in that the upper and lower deforming elements are in the form of a quick-change rollers with different radii of transverse curvature, consistently approaching a given radius of curvature of the workpiece during its rotary-local deformation considering springback.



 

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