RU2155112C2 - Die set for making parts from rod - Google Patents

Abstract

FIELD: plastic metal working, namely, in metallurgical industry branch for making parts such as lamps of rail joining, connection braces and eyes. SUBSTANCE: die set includes units for preliminary and final bending having dies and mandrels, member for fixing blank and mechanism for moving blank from preliminary bending unit to final bending unit. In unit for final bending member for fixing blank is mounted on cross piece spring- loaded in bending direction. Member for fixing blank is in the form of supporting plate with protrusion restricting (together with cross piece) cavity for placing blank. Supporting plate is mounted with possibility of regulating its position relative to mandrel. EFFECT: possibility of making three-dimensional parts of high accuracy, enhanced reliability of die set operation. 2 cl, 6 dwg

Description

 The invention relates to the processing of metals by pressure and is intended for use in the metallurgical industry in the manufacture of bar components such as rail fasteners, connecting brackets and loops.

 A known stamp for the manufacture of parts from a bar (see ed. Certificate of the USSR N 649488, class B 21 D 35/00, publ. In B.I. 1979, N 8), containing nodes of preliminary and final bending, including corresponding matrices and mandrels, as well as a sliding mechanism for moving the workpiece from the preliminary bending unit to the final bending unit - these signs coincide with the essential features of the claimed invention.

 The disadvantage of this stamp is the limited technical ability to bend complex parts of a spatial shape due to the inability to rotate a pre-bent workpiece.

 Known stamp for the manufacture of parts from a bar (see Russian patent N 2062161, CL B 21 D 22/02, published 06/20/96, Bulletin N 17), containing the nodes of the preliminary and final bending, including the corresponding matrix and mandrel, clamp blanks, traverse and sliding mechanism for moving the blank from the preliminary bending unit to the final bending unit - these signs coincide with the essential features of the claimed invention. The clamp of the workpiece is installed inside the mandrel and is made in the form of a rod having a working section located above the end surface of the mandrel.

 The disadvantage of this stamp is the low accuracy of the details of the spatial shape due to the inability to adjust the position of the pre-bent workpiece relative to the mandrel in the final bending unit.

 Closest to the technical nature of the claimed is a stamp for the manufacture of parts from a bar (see USSR patent N 1817723, CL B 21 D 35/00, 22/02, published 05/23/93, Bull. N 19), containing nodes preliminary and final bending, including the corresponding matrixes and mandrels, a spring-loaded clamp of the workpiece and a sliding mechanism for moving the workpiece from the preliminary bending unit to the final bending unit - these signs coincide with the essential features of the claimed invention. The clamp of the workpiece is placed between the nodes of the preliminary and final bending and is recessed by the workpiece when it is moved by the slide mechanism.

 The disadvantage of this stamp is the low accuracy of the details of the spatial shape due to the unstable position of the pre-bent workpiece relative to the mandrel in the final bending unit, since the workpiece may collide with the gate mechanism from the mandrel.

 For analogues and prototype, the common reason that impedes obtaining the required technical result is the impossibility of obtaining exact details of the spatial form.

 The basis of the invention is the task in the stamp for the manufacture of parts from a bar by installing the clamp of the workpiece in the final bending unit on the traverse and making the clamp in the form of a support plate with protrusions to ensure accurate spatial details and reliable operation of the stamp.

 To solve these problems, the stamp for the manufacture of parts from the bar contains the nodes of the preliminary and final bending, including the corresponding matrix and mandrel, the clamp of the workpiece and the slide mechanism for moving the workpiece from the preliminary bending unit to the final bending unit. Unlike the prototype, in the final bending unit, the workpiece retainer is mounted on a traverse spring-loaded in the direction of bending and is made in the form of a support plate with a protrusion, which forms, together with the traverse, a cavity for accommodating the workpiece.

 In particular cases of the stamp, the support plate is made with the possibility of its regulation relative to the mandrel.

 The above features of the claimed invention provide a technical result, which consists in obtaining the exact details of the spatial form and increase the reliability of the stamp.

 A causal relationship between the totality of the essential features of the claimed invention and the achieved technical result is as follows.

 The installation of the workpiece retainer in the final bending unit on a traverse spring-loaded in the direction of bending allows you to precisely fix the workpiece relative to the mandrel of the final bending unit at a predetermined level corresponding to the location of the beam surface facing the workpiece.

 The implementation of the latch in the form of a support plate with a protrusion, forming together with the traverse a cavity for placing the workpiece, makes it possible to accurately orient and fix the pre-bent workpiece relative to the mandrel until the start of the final bend and thereby obtain the exact detail of the spatial shape. Accurate fixation of the workpiece in the traverse cavity does not cause the workpiece to collide with the slide mechanism and to malfunction of the stamp, which increases the reliability of its operation in automatic mode.

 The implementation of the base plate with the possibility of adjusting its position relative to the mandrel makes it possible to compensate for inaccuracies in the manufacture of the stamp or the deviation of the dimensions of the pre-bent workpiece by approximating or removing the base plate relative to the mandrel, for example, by changing the thickness of the gaskets between the base plate and the traverse. In this case, an increase in the accuracy of orientation of the workpiece relative to the mandrel is achieved and the accuracy of the curved part of the spatial shape increases.

The invention is illustrated by drawings, which depict:
in FIG. 1 - stamp for the manufacture of parts from a bar;
in FIG. 2 is a section along AA in FIG. 1;
in FIG. 3 - stamp in the position corresponding to the beginning of the working stroke;
in FIG. 4 is a plan view of the stationary part of the stamp in FIG. 3;
in FIG. 5 is an example of a rail fastener terminal detail;
in FIG. 6 - intermediate position of the workpiece in the stamp when it is transferred to the final bending unit.

 The stamp for the manufacture of parts from a rod contains a pre-bending unit 1, including a matrix 2 mounted on a movable plate 3 of the bending machine, a mandrel 4 mounted on a fixed plate 5, a sleeve knife 6 for cutting the rod, and a stop 7 for measuring the length of the workpiece. The final bending assembly 8 includes a matrix 9, a mandrel 10, a traverse 11, covering the mandrel 10 along the contour and spring-loaded in the direction of bending relative to the fixed plate 5 by the springs 12, the workpiece clamp 13 mounted on the traverse 11 and made in the form of a support plate 14 with a protrusion 15. Traverse 11 together with the protrusion 15 forms a cavity 16 for accommodating a pre-bent workpiece 17.

 The gate mechanism 18 for moving the workpiece from the pre-bending unit 1 to the final bending unit 8 contains a wedge 19 mounted on a movable plate 3, in which a shaped groove 20 is made. In the groove is a roller 21, mounted on an axis 22, which is fixed in two flat gates 23 The gates 23 interacting with the pre-curved billet 17 are made with the possibility of reciprocating movement on the stand 24.

 To regulate the position of the support plate 14 in the direction of approach or removal from the mandrel 10 between the support plate 14 and the end of the beam 11 are interchangeable gaskets 25.

 The stamp works as follows. In the pre-bending unit 1, through the bushing knife 6, the initial bar 26 arrives until the stop 7 touches, which is cut by the edge of the matrix 2 at the knife 6 during the working stroke of the plate 3. Then the bar is bent by the matrix 2 around the mandrel 4 until the workpiece receives a flat shape 17. During the return stroke of the movable plate 3, the roller of the mechanism for moving the workpiece from the pre-bending unit to the final bending unit, rolling around the inclined part of the groove 20 of the wedge 19, moves the flat gates 23 along the stand 24. Moving onto the pre-curved billet 17 located I’m on the mandrel 4, the sliders 23 remove the workpiece from the mandrel 4, then push the workpiece with one end on the end of the beam 11, rotate it 90 degrees and slide it until the workpiece touches the support plate 14. Thanks to the placement of the workpiece 17 in the cavity between the beam 11 and the protrusion 15 of the latch 13, the workpiece is fixed at a predetermined level relative to the mandrel 10 of the final bending unit. The restriction on the ability to move the workpiece 17 in side relative to the mandrel 10 by touching the workpiece of the support plate 14 allows you to accurately orient the pre-bent workpiece before the final bending of its matrix 9 during the next working stroke of the stamp. In this case, there is no malfunction in the work of the stamp due to the collision of the workpiece with the mandrel 10. The edges of the matrix 9 move the traverse 11 along the mandrel 10, compressing the springs 12, and near the mandrel 10 there is a place for bending the workpiece 17. If necessary, adjust the position of the workpiece 17 relative to the mandrel 10 to obtain the dimensional accuracy of the finished part, the thickness of the gaskets 25 decreases or increases between the support plate 14 and the end of the beam 11. After bending the workpiece to its final spatial shape, the beam 11 is returned by the springs 12 and pushes the finished workpiece from the mandrel. In the stamp, two billets are simultaneously bent at nodes 1 and 8.

 In a stamp for the manufacture of rail fastening terminals mounted on a horizontal bending machine with a force of 1000 kN, parts with an accuracy of up to 0.7 mm are manufactured without malfunctioning when re-laying a pre-bent workpiece.

 Thus, in the manufacture of the inventive stamp parts of a spatial shape provides high precision parts and reliable operation of the stamp.

Claims (2)

 1. A stamp for the manufacture of parts from a bar, containing the nodes of the preliminary and final bending, including the corresponding matrix and mandrel, the workpiece clamp and the slide mechanism for moving the workpiece from the preliminary bending node to the final bending unit, characterized in that the workpiece clamp is installed on the final bending unit on spring-loaded in the direction of bending of the traverse and made in the form of a support plate with a protrusion, forming together with the traverse a cavity to accommodate the workpiece.  2. The stamp according to claim 1, characterized in that the base plate is arranged to adjust its position relative to the mandrel.

Images