The method of forming the flat bottom with the running of a tubular workpiece

 

(57) Abstract:

Usage: when forming the flat bottoms of the running tool friction tubular blanks. The inventive method of forming a flat bottom when running a tubular piece with a fracture forming a right angle tool friction with the ruled surface are supplied with energy to deform the metal of the rotating workpiece and rotatable in an arc of diffraction of deforming the tool. At successive stages of the formation of the bottom of the tubular workpiece reported move in mutually opposite directions along the axis, and moving the workpiece in the first stage of forming is carried out in the direction of the tool, and the second stage in the opposite direction will agree with the change of direction of the velocity vector displacement of the center of application of deforming force of the tool along the arc of a circle located at a given technological parameters of the process of deformation distance equidistant arc rounding of the deforming tool. The method provides the expansion of technological capabilities and improving the efficiency of the process of forming flat bottom. 5 Il.

The disadvantage of this method of forming the bottom of the running tool friction is the narrow range of localization of the deformation zone, which significantly reduces the technological capabilities of the method.

The aim of the invention is the expansion of technological capabilities and increase the efficiency of the method of forming the bottom of a tubular preform by expanding the range of controlled movement of the local deformation of the metal of the workpiece in the area of contact of the tool with the workpiece.

This is achieved by the fact that in the known method of forming the bottom of the tubular blank by rolling tool friction tubular workpiece reported move in mutually opposite directions along the axis, and the direction of movement of the workpiece coordinate with the change of direction of the velocity vector displacement of the center of application of the external force deformation to the tool in an arc of a circle located at a given technological parameters of the process of deformation distance equidistant arc geologinen in front part of the bottom of the hole.

In Fig. 1 shows the interaction between the workpiece with a tool for mutual testing and axial feed of the tubular workpiece in the direction of the tool; Fig.2 scheme of interaction between the tool and the workpiece in the area of the contact surface of Fig.3 technological scheme of forces acting from the side of the tool on the workpiece in a spatial coordinate system rotating around the Y-axis with its center located on the contact surface instru - ment with the metal of the billet of Fig.4 a diagram of the sequential steps of forming a bottom with a Central hole under a mutual testing and axial movements of the workpiece V'Cand VCand scheme forces applied externally to the instrument; Fig. 4B, the layout of the velocity vectors move the center of effort of the deformation along the arc of a circle, equidistant arc rounding of the deforming tool at stages I and II forming the bottom of Fig. 5 schematic structural diagram of the method of forming a bottom with a Central hole.

Under the proposed method the tubular workpiece 1 is heated to forging temperature by the end of rotate around its longitudinal axis with angular velocityIand running flat the Oia efforts deformation and friction forces applied from the side of the workpiece from the tool applied force P, providing the movement of the tool in the process of running. Simultaneously with the mutual testing of the tubular workpiece 1 report moving along its axis at the stage of formation of I to the value of L in the direction of the tool with the speed V'3(Fig.1-3). While movement of the workpiece along the axis and moving the tool along the arc of rolling in the deformation introducing additional amounts of metal, it is more warming in the most intense area of the deformation zone, thanks to intensifying the process of bending deformation in the cross section of the tubular workpiece. At this point a on the workpiece 1 is moved to the position a', then the point a' is moved to point a and then at point a'. These moving points on the workpiece and, accordingly, the moving amounts of the metal in the zone of deformation is carried out by moving the plane of the tool ehc consistently in the position of ea 'c' and at the final stage of formation of the bottom position ea"'c". The tool slides along the generatrix, and the workpiece is deformed in the diameter and in the longitudinal direction. Created by local pressure of the tool on the metal layer, what causes the hollow billet radial tensile stresses, causing thickening of the walls of the hollow billet (Fig.4A).

During the rotation of the workpiece in a clockwise direction (Fig.2) and mutual testing the boundaries of the speakers of the deformation is bending the wall of the shell, on the border of the BS is the straightening of the shell, between the borders of the as and BS straightened shell element is moved, overcoming the friction force at the contact surface, on the border BS again bent. In the process of bending and moving of metal the length of the section of the deformation zone by moving the workpiece along its axis in the direction of the tool at the first stage, the formation of the bottom (Fig.2 and 4A) is changed in size, thus there is a shift of the surface layers of metal towards the end of the deformation on the end face of the workpiece with decreasing radius of the mechanical part of the dt.

Technological scheme of forces acting from the side of the tool on the workpiece (Fig.3) in a spatial coordinate system represented by the normal force N and its components, which influence on the deformation process varies over time with changes in the magnitude and direction of the force components (NzNyNxas is the tool with the workpiece. At the first stage, the formation of the bottom of the tangential component of Nzdirected along the generated surface and is summed with the power to ensure that the movement of the workpiece along its axis in the direction of the tool with the speed V'C.

At the second stage of the formation of the bottom (Fig.4A) stocking report for axial movement along its axis by the calculated value from the tool. At the second stage of the formation of the bottom, with appropriate rotation of the coordinate system in the zone of deformation around the Y-axis increases the value of the components of Nx, the value of which is summed with the power to ensure that the movement of the workpiece along the axis with velocity VC. The zone of deformation is localized closer to the axis of the workpiece, due to which intensifies the process of forming the Central part of the flat bottom.

At successive stages of formation of a flat bottom (Fig.4A) increases the thickening of the walls in the zone of maximum width of the contact area of the workpiece, moving in the direction of the Central hole of the bottom.

The direction of movement of the tubular workpiece along the axis coordinates at the I and II stages of the formation of the bottom with the change of direction of the velocity vectors /SUB>ABOUTC.E.V( Fig.4A) equidistant arc rounding of the deforming tool.

At the first stage, the formation of the bottom velocity vectors move ABOUTC.E.application of deforming force of summed with the velocity vector of the moving workpiece V'C. In point OC.E."' the direction of the vectors VC-VC"' changes, and accordingly alter the direction of movement of the workpiece on the opposite V"C. At the second stage of the formation of the bottom velocity vectors of displacement of the center of application of force P are summed with the velocity vector of the moving workpiece V"C(Fig.4B). Stages I and II forming the bottom correspond to successive positions of the deforming tool 0-3 and 4-5 respectively (Fig. 4A). At the second stage, with the output of the center for the application of deforming force of the tool in position 0C.E.V(Fig.4A) completes the formation of the bottom, which corresponds to the position of the deforming tool in position 5 (Fig. 4A).

Implementation of the proposed method of forming a flat bottom with a Central hole is implemented according to the circuit diagram shown in Fig.5. Energy for deformation is applied to a rotating workpiece I and the tool and workpiece about the axis center O with successive stages of formation of the bottom of the workpiece simultaneously with the rotation of the report move along its axis in mutually opposite directions. The tool 2 is fixed in the rotary cage 3 and carry out running-in of the workpiece 1 in the first stage of the formation of the bottom (Fig.4) while moving the workpiece along its axis in the direction of the tool on the calculated value of L, with 0C.E.the application of force P deformation 4 move along the arc 0C.E.0C.E.IIIlocated equidistant arc of the rolling tool around the workpiece. At a formative stage II procurement report moving along its axis in the direction of the tool, the center of application of the force P of the deformation moves in an arc 0C.E.III0C.E.V(Fig.4), located equidistant arc of the rolling tool around the workpiece. The hydraulic cylinder 5 creates a constant force P through the rod 6 and the plug 7 to pin 8, and the direction of application of force P at different points on the arc of the rolling OC.E.0C.E.Vcharacterized by the angleiwith respect to a plane perpendicular to the axis of the workpiece. The rotation axis of the cylinder in the process of formation of the bottom is ly R arc diffraction the speed of the axial movement of the workpiece is changing in a wide range of stress-strain state of metal and range of movement of the center of the localization of the deformation zone.

Technical and economic efficiency of the proposed method is achieved by expanding the technological capabilities of the method and increase the efficiency of formation of the bottom.

METHOD of FORMING a FLAT BOTTOM WHEN RUNNING a TUBULAR piece with a fracture forming a right angle with a flat instrument friction with ruled surface, which are supplied with energy to deform the metal of the rotating workpiece and rotatable in an arc of diffraction of deforming tool, characterized in that the tubular workpiece at successive stages of the formation of the bottom of the report move in mutually opposite directions along the axis, and the direction of movement of the workpiece coordinate with the change of direction of the velocity vector displacement of the center of application of deforming force of the tool along the arc of a circle located at a given technological parameters of the process of deformation distance equidistant arc of ogiba

 

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