Die for extrusion parts with hollow cavity (options)

 

(57) Abstract:

The invention relates to the field of metal forming, namely, to designs of dies for extrusion, mainly used in the experimental study of deformation of metal by forging hollow parts with flange and without flange, as well as in small-scale production. The invention solves the problem of extending the functionality of the stamp during extrusion parts with a blind cavity. Die for extrusion parts with hollow cavity is provided with an elastic element that provides a specified displacement matrix in the formation of the flange metal flow in a slit of variable height, pressure sleeve, transmitting the traffic matrix from the press slide, and the adjusting rings, sets the beginning of the motion matrix. Die for extrusion parts with hollow cavity may also be provided with a set of metal rings of different heights, providing a constant gap height between the matrix and punch in the formation of the flange for metal in the crevice of constant height. 2 S. p. f-crystals, 2 Il.

The invention relates to the field of metal forming, namely, to designs of dies for extrusion, HRP parts with flange and without flange; as well as in small-scale production.

Known experimental stamp for deformation of specimens (ed.St. N 700255, B 21 J 5/100). The stamp is designed to improve the measurement accuracy: deforming efforts; efforts on the elements of the material; friction forces that occur on the inner side surface of the die during extrusion, but unsuitable for the study of deformation during extrusion of glasses with a flange at the bottom.

Known designs of the stamps, in which the flange to receive the radial extrusion of the metal in the annular gap of constant height (Ovchinnikov A., fundamentals of theory stamping extrusion presses. -M.: Mashinostroenie, 1983, S. 103, Fig. 2.37; Barkov C. S., Podrabinek L. I. Power settings stamping extrusion in split matrices forging flange. Forging and stamping production, 1979, No. 12, S. 1, Fig. 1). Known constructions do not allow to investigate the forming of the metal at a variable height of the flange, in addition, they are intended for details drive type with flange and unsuitable for stamping products with an internal cavity.

Known also design stamps, according to the scheme of direct extrusion with a free draft of the bottom flange (Forging and the reconstruction does not allow to investigate the formation of the flange for metal in the crevice of constant height and in addition, when the deformation in these stamps procurement must be pre-stamped and have the shape of a Cup.

Closest to the claimed is the stamp for extrusion in a split matrices forging flange (Barkov C. S. Osobaya stamping split matrices forging flange. Forging and stamping production, 1983, No. 9, S. 17, Fig. 2A, right). On the plate through the elastic element based mobile bottom polimetrica having the ability to move in the vertical direction. On the top of volumetric made a groove into which the metal flows when placing the flange in the deformation process. The elastic element is placed in a recess in the plate, lifts polimetrica, providing a more convenient styling of the workpiece in the working area of the stamp, as well as the destruction of stamped products. When deformation of polimetrica moves down, compressing the elastic element, and draws its lower end on the plate. In the hole polimetrica hour is used to create a backwater when dispensed.

Top polimetrica through the die-holder connected to the outer slide of the press double action and moves vertically together with the slider. In the opening paragraph is LASS="ptx2">

's renowned design stamp in the following way. Both the press slide with the upper polimetrica and punch are in the top position. Under the action of the elastic element lower polimetrica raised. Procurement (product) is placed in the lower polimetrica. When enabled, press both the slider is moved down, and the outer slider moves faster than the inner. Top polimetrica relates to its lower end face of the lower volumetric and, compressing the elastic element moves down to rest on the bottom plate. After that the punch connected with the inner slider produces extrusion with a force of Pd, forcing the metal to flow in two directions: vertically and laterally, filling the gap formed by the groove in the lower polimetrica and limited from above the bottom end of the upper polimetrica. Thus, the formation of the flange is of the radial flow of the metal in the crevice of constant height equal to the depth of the grooves.

In the course of deformation of the outer slide of the press presses polimetrica with a force of PCRpreventing the formation of gap between them. After deformation both of the slide is returned together with the upper polimetrica and punch in the source state is="ptx2">

In the known construction the diameter and depth of the grooves in the bottom polimetrica when placing the flange remain constant and examine the metal flow in a slit of variable height in the formation of the flanges, and forming metal during filling of the corners of the stamp during extrusion is not possible.

The basis of the invention is to extend the functionality of a stamp, namely the creation of this design, which would allow us to experimentally investigate the forming of the billet during extrusion parts with a cavity having a bottom flange, and the formation of the flange is: the metal flow in the annular gap of variable height with simultaneous deformation setecho metal in the annular gap of constant height; and for metal in the corners of the stamp during extrusion of the billet, having in the lower part of the conical section.

It is known that the use of blanks, having a conical section at the bottom, allows you to squeeze out the product with high strength bottom part.

The task is the fact that the stamp for extrusion parts with hollow cavity contains a matrix, a die-holder, the punch, peasantization matrix, as well as the adjusting ring gaskets and gland with a through groove placed in the annular groove on the top of the matrix.

In another embodiment, the stamp for extrusion parts with hollow cavity contains a matrix, a die-holder, punch, pancontinental, stove, and also a set of metal rings of different thickness to be installed in the drillings in the plate and respectively on the bottom of the matrix.

In the first case the presence of the elastic element allows you to adjust the magnitude of the change of the gap between the lower end face of the matrix and the plate in the flow of metal into the slit of variable height, the presence of a pressure sleeve moves matrix from the press slide, and adjustment rings allow you to set the desired start of movement of the matrix.

In the second embodiment, the presence of metal rings, which relies on the matrix in its groove, provides a constant gap between the lower end face of the matrix and plate while placing the flange of the metal flow in the radial gap of constant height.

The invention is illustrated by drawings of the General form of the stamp during extrusion parts with the cavity. In Fig. 1 shows vydavlivaniyu between the plate and the bottom end of the movable matrix with simultaneous deformation setecho in the specified slot metal: left - the initial position of the matrix and the beginning of the flowing metal in the gap; on the right is the final design details. In Fig. 2 shows the extrusion of details, with the formation of the flange takes place over the metal in the crevice of constant height, located between the plate and the bottom end of the fixed matrix; on the left is the beginning of the formation of the flange; right - finalize details.

The stamp consists (Fig. 1) attached to the table of a press (not shown) plate 1, in which the annular groove 2. The Jack plate is the matrix 3 having at the lower end of the annular groove 4, the corresponding width specified and opposite. The grooves are placed elastic element 5, which is based on the matrix 3, held in the socket plate 1 by the die-holder 6 that is connected to the plate by means of the mount 7. Between the lower end face of the matrix and plate 1 provided initial gap 8. On the top of the matrix 3 in the groove posted by adjustable ring 9 and relies on push sleeve 10, which is a through groove 11.

The punch 12 having a lower thickness in the working part 13, is connected through pancontinental 14 with the press slide (not shown). The punch 12 is mounted a sleeve 15, uterina direction in the groove 11 of the pressure sleeve 10. The amount of movement of the arm is fixed by the registration device 17 (beam with attached load cell, photocell, emitter, the device type indicator, and so on).

Stamp works as follows. In Fig. 1 shows the position of parts of the stamp during extrusion parts with flange, with the flange design is the metal flow in the gap variable height 8 located between the plate and the bottom end of the matrix. In the initial position of the press slide (not shown) attached peasantization 14, the punch 12 and attached to the plug sleeve 15 is in its upper position. In an annular groove 2, is made in the plate 1, place of the elastic element 5 (polyurethane, rubber, springs and so on), then in the nest plates establish a matrix of 3 so that it rested on the specified elastic element. When tightening of the mount 7 and the die-holder 6 is the effect on the matrix 3 and moves it downward, compressing the elastic element 5 up until between the lower end face of the matrix 3 and the plate 1 will not be set to the desired initial gap 8. Then the matrix lower the workpiece, and an annular groove made on the top of the matrix, place the adjusting ring 9, they set narimousa protrusion of the push sleeve governed selection of rings 9.

After switching on, press the slider is moved down together with the punch 12 and put on him by the sleeve 15 attached to bracket 16. The punch and the lower part of the sleeve is fixed in the matrix. When plastic deformation of the workpiece metal flows in two directions: radial - into the gap 8 between the lower end face of the matrix and plate, forming a flange, and upward in the gap between the working thickened part of the punch 13 and the matrix, making the walls 18 of stamping products. At the right moment, defined by the protrusion of the push sleeve 10, which is regulated by the rings 9, pancontinental 14 presses its lower end to the sleeve 10, forcing them to move down the matrix 3. At this time, the compressed elastic element 5, there is a constant reduction of the gap 8 between the matrix and the plate and simultaneously deformed metal, saakshi and continues to flow into the gap. The formation of the flange 19 over the metal in the crevice of variable height. At the end of the deformation receive the required height of the flange. The magnitude of the displacement matrix is governed by the initial gap between the matrix and the plate when tightening the mount 7. When the metal flow up the top end wall 18 stamped part affects wut who is registering device 17. After deformation of the press slide with peasantization, punch and put on him by the sleeve returns to its original position. Stamped item is removed from the cavity of the matrix, and then the cycle repeats.

Another variant of the stamp shown in Fig. 2, which shows the position of the parts of the stamp during extrusion parts with flange, with the flange design is a radial flow of the metal in the crevice of constant height, located between the lower end face of the matrix and stove.

The stamp consists (see Fig. 2) from the plate 1, in which the annular groove. The Jack plate is the matrix 2 with the bottom end is also provided with an annular groove corresponding to the width specified and opposite. In the grooves, there is a metal ring 3 different heights, which relies on the matrix and is pressed by the die-holder 4 by means of fixing node 5. Between the lower end face of the matrix 2 and the plate 1 by means of a metal ring installed gap 6 that corresponds to the desired thickness of the flange of the extruding parts.

The punch 7 having a lower thickness in the working part 8, is connected via poisonedwaters 9 with the press slide (not shown). The punch is mounted a sleeve 10, to kotorom device 12.

Stamp works as follows. In the initial position of the press slide with attached peasantization 9, the punch 7 and attached to the plug sleeve 10 is in its upper position. In an annular groove made in the plate 1, place the metal ring 3, having different thickness. The total height of the ring should be such that when installed on them matrix 2 between the lower end face of the matrix and the plate 1 there is a gap of 6 equal to the thickness of the flange parts. The die-holder 4 when tightening the mount 5 matrix 2 is firmly pressed against the rings 3. Then the matrix lower the workpiece include a press. The press slide is moved down, the punch 7 and the sleeve 10 are included in the matrix, the punch begins to deform the workpiece.

In Fig. 2 (left) shows the position of parts of the stamp at the beginning of the filling of the gap 6 metal (early education flange).

During extrusion parts metal flows in two directions: radial - into the gap between the lower end face of the matrix 2 and plate 1, forming a flange, and upward in the gap between the working thickened part of the punch 8 and the die, making the wall 13 of the extruding parts.

In Fig. 2 (right) shows the position of parts of the stamp at the time of the final formation on alsaudia up raises the sleeve 10, which are attached to the bracket 11. Vertical movement of the bracket is fixed recording device 12.

After squeezing out the stamped part is removed and the cycle repeats.

The design of the stamp can be used also in the study of filling the metal corners of the stamp in the case of workpieces with a conical section at the bottom. Such blanks are used for extrusion products with high strength bottom part. In this case, remove the metal ring 3 (Fig. 2) and press the matrix 2 to its lower end directly to the plate 1. When deformation of the workpieces is observed for bilateral metal - up (formed wall products) and in the corners of the stamp.

Thus, the proposed stamp for extrusion parts with hollow cavity extends experimental studies of the deformation of blanks for stamping hollow parts with flange, with the formation of the flange with radial flow of the metal as possible in the gap variable and constant height. The stamp also allows to experimentally investigate the flow of metal in the corners of the stamp during extrusion of billets and semi-finished products having castlet as when using the whole volume of the blanks and semi-finished products, and integral with the preliminary application of coordinate grids, moiré patterns, the introduction of isotopes, etc.

The stamp can be used in small-scale production for forming hollow parts with flange and without flange, as well as products with high strength bottom part, and the cavity during extrusion may be cylindrical, conical or stepped. In the case of the stamp you want to remove the bracket 11 and the recording device 12 (Fig. 2). The sleeve 7 will perform the role of the guide sleeve.

The operation of the stamp in the production environment does not require the use of expensive presses, double action, because its design allows you to stamp the parts on conventional presses, designed for extrusion.

The design of the stamp is relatively simple and does not require additional costs for the changeover when switching from one product to another.

1. Die for extrusion parts with hollow cavity containing a matrix, a die-holder, punch, pancontinental, plate, characterized in that the stamp further comprises an elastic element mounted in the drillings in the plate and respectively on the bottom of the matrix, and regulirovanie matrix.

2. Die for extrusion parts with hollow cavity containing a matrix, a die-holder, punch, pancontinental, plate, characterized in that the stamp further comprises a set of metal rings of different thickness to be installed in the drillings in the plate and respectively on the bottom of the matrix.

 

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