Method for making forgings by hot extrusion in extruding press having movable container

FIELD: plastic metal working, possibly forging variable cross section parts by extrusion in hydraulic presses with movable container.

SUBSTANCE: method comprises steps of feeding heated blank to container; pressing out blank in container by means of pressure pad and extruding part of blank to die of die set; forming forging having constant cross section part and thickened part that is formed after upsetting remaining portion of blank; placing part of die set in container according to condition of joining their planes. Upsetting of remaining portion of blank for forming thickened part of forging is realized in cavity between joined planes of die set unit and container. Said cavity is formed due to moving die set unit relative to container before forming thickened part of forging. Upsetting operation is realized due to simultaneous motion of pressure pad and container.

EFFECT: possibility for making forging with complex outer and inner configurations, simplified assortment of technological tools, enhanced quality of forging.

2 cl, 9 dwg

 

The invention relates to the processing of metals by pressure and can be used for stamping the extruded parts with variable cross-section in hydraulic presses with movable container.

It is known that the amount of plastic deformation that can be achieved without destruction (ultimate strain), is influenced by many factors, the main of which mechanical properties of the metal (alloy), temperature-speed conditions of deformation and the scheme of the stress state. The last factor has a great influence on the value of the ultimate strain. The highest marginal deformation is achieved in the absence of tensile stresses and increase compression. One of the most optimal schemes of processing of metals pressure is forming by extrusion, in which plastic deformation occurs in the context of a comprehensive, non-uniform compression, which allows to obtain without destruction of the workpiece is very large degree of deformation in the direction coinciding with the movement of the punch, and in the lateral direction that does not coincide with the movement of the punch. Hot extrusion as the process operation of forming processes used for the manufacture of a wide range of parts (Sokolov N. HP Hot forming by extrusion steel parts, Meters, machinery, 1967, p.25-1).

A known method of manufacturing forging extrusion, comprising the sequentially executed operations: cut blanks from rolled in the stamp, the combination of a rod and drawing the outer contour of the head by a set of metal in the conical cavity of the punch prior to planting and the final shaping of the head. The workpiece using a diameter corresponding to the diameter of the end face of the head, with subsequent processing of the frame and calibrated diameter. Then at the same time produce the formation of a cavity, the calibration of the end heads and the dosing volume through a combination of extrusion, and the design of the outer contour of the head is carried out sequentially on its height when set metal and the final shaping of the landing, with a given profile of the cavity is fixed mandrel (RF patent No. 2205722, 21 To 1/00).

The disadvantage of this method is its low flexibility, a large number of transitions, the profitability of this process scheme is revealed only in terms of large-scale and mass production.

There is a method of hot forming hollow articles in which shaping the product is made by one stroke of the punch, the outer side surface is formed in the collapsible sleeve disposed in the container of a press. Shaping ensures the through redistribution of flow flow of the metal during its simultaneous extrusion into the main cavity and technological projections (radial and axial), then the bottom is removed. The technological section of the protrusions is appointed subject to the conditions of deformation and tool life (patent RF №2191654, 21 J 5/06).

The disadvantage of this method is the difficulty in manufacturing technological tool in the selection and adjustment of process parameters.

A known method of manufacturing a hollow cylindrical articles, comprising a pipe with constant or variable cross-section of the outer side surface and one-sided flange from a piece of cylindrical workpieces, comprising heating the workpiece, the workpiece with the axial opening in the container, pressing the cylindrical part of the product in the gap between the working channel matrix and the mobile press-needle. At the same time carry out the shaping of the flange in the cavity formed by the end face of the container and the surface of the die-holder (patent RF №2216419, 21 23/08).

The disadvantage of this method lies in the limitations of the fact that the cavity for pressing tightly bound and limited by the gap between the ends of the die-holder and container, as a result, you may receive only products with one-sided flange thickening.

A known method of manufacturing forgings hot extrusion presses with movable container, comprising feeding the heated billet into the container, espresso the billet in the container of the press washer, the pressing part in the matrix, a subset of the matrix node, forming stamping part with constant cross section and forming on the stamping thickening by precipitation of the remaining part of the workpiece (SU 632426 And 15/11/1978, 21 23/08) prototype.

The disadvantage of this method is the complexity and high cost of manufacture of the tool, limitations on the formation of a thickening complex configuration and location along the length axis of the manufactured product.

The problem to which this invention is directed, is getting forgings with a variable cross-section of the outer side surface on machines with a movable container, for example protoveratrine.

The technical result achieved in the implementation of the invention is to obtain one of the technological transition of the blanking complex internal and external configurations, including those with thickening on the outer surface, reducing the range of technological tools, the improvement of the quality of surfaces and stability of the geometric dimensions of the products, reduce energy and labor costs and increase opportunities universal press equipment.

This technical result is achieved by the fact that in the proposed method of manufacture of forgings hot extrusion presses with movable container is am, includes feeding the heated billet into the container, repressive billet in the container of the press plate, the pressing part in the matrix, a subset of the matrix node, forming stamping part with constant cross section and forming on the stamping thickening by precipitation of the remaining part of the workpiece, a portion of the matrix node is placed in the container of the conditions for the pair of planes, and the draught of the remaining portion of the workpiece during the formation of thickening is carried out in a cavity between the mating planes of the matrix node and container which is formed by moving the matrix of the node relative to the container before the formation of the thickening, and the precipitate produced by the synchronous movement of the press plate and container.

The method allows the use of forward, backward and lateral extrusion, and combinations thereof. Matrix node in the structure of the die-holder and the matrix may be composed of several technology in the manufacture of parts. Forming forming is performed with one heat one tool set. As a consequence, reduced labor costs, energy intensity of the process and reduced the range of technological tools. Optimal selection processes of metal forming, as well as the applied tool which allows you to expand the range of manufactured parts, to increase their range in mass and size, as well as to improve the dimensional accuracy of the metal structure and the quality of their surfaces.

It is also possible in the manufacture of forgings, having along with the specified thickening thickening on the lateral surface, use a combined matrix, and the formation of a thickening on the lateral surface for the cavity which is formed between the parts of the team matrix.

One of the components of the matrix has a free axial movement, which is carried out simultaneously with the movement of the container.

Figures 1 and 2 is a flow diagram of forming a monolithic rod with a flange having recesses at the rear end stamping: figure 1 is a top starting position before the pressing operation of the matrix 1, container 2, the workpiece 3 and the press washer (figure ledge) 4, bottom extrusion rod 5 and the formation of cavities on the back side of the workpiece, in figure 2 above, the formation of the cavity 6 between the container and the die outlet of the container, the bottom - forming flange 7 after precipitation of the workpiece while moving the container and press the washer.

Figure 3 is the same as in figure 1 and 2 with the formation of the protrusion 8 on the rear side of the stamping.

Figure 4 is the same as in figure 1 and 2 with the formation of the conical flange 9.

Figure 5 is the same as in figure 1 and 2 with the formation of a stepped stem is.

Figure 6 is a flow diagram of forming glass flange, and an upper shaping glass by the method of backward extrusion into the gap between the press needle 10 and the container 2, bottom - punching thickening formed by the drainage of the container 2 from the matrix 1.

7 forming hollow articles with flange: top - direct extrusion of hollow element into the gap between the press needle 10 and Villeroy matrix 13, the bottom - forming thickening (flange) 11.

On Fig: top - direct wypracowanie deaf hollow element 12, bottom - punching thickening.

Figure 9: top diagram forming hollow articles with a flange 13 into the cavity formed in one end surface of the matrix and container, bottom - punching thickening on the lateral surface of the workpiece in the cavity 14 formed between the two parts of the team matrix 15 and 16, and the cavity 14 is formed by the joint of the outlet of the container 2 and the movable part of the matrix 16. The movable part of the matrix folding that provides its removal after removing the items.

Industrial applicability of the claimed method of manufacturing forgings variable cross section by hot extrusion is confirmed by the following specific example on the horizontal, protoveratrine press force 3150 TC. Manufactured shaped billet of titanium alloy VT6 with stud ⊘120 mm, on the other 500 mm, flange ⊘295 mm and height 50 mm lip on the rear end ⊘140 mm and height 150 mm Cylindrical workpiece dimensions ⊘197×385 mm is heated to a temperature of 950°and loaded into container ⊘200 mm Is supressive rod ⊘120×500 mm in a matrix to another (closing stamp), and in the cavity of the press washer ledge ⊘140 x 150 mm, then the container away from the die-holder at a distance corresponding to the undeformed part of the billet, and the simultaneous movement of the container and press the stamp to form the flange ⊘295×50 mm

This method allows a single setup of the workpiece to produce the design of complex internal and external surfaces forming. Sequential execution of internal and external circuit components reduce the clamping, increase tool life and improve the quality of the part. The invention provides waste reduction process, minimizing specific efforts on the instrument and increase its durability, high quality products, expanding the technological capabilities of hot die forging to increase the complexity of the shape of the external circuit and the cavity and improve the service properties of parts with the use of metals and alloys with increased strength. Also significantly expand the technological capabilities of the universal hydraulic PR is sow with a movable container.

1. A method of manufacturing forgings hot extrusion presses with movable container, comprising feeding the heated billet into the container, repressive billet in the container of the press plate, the pressing part in the matrix, a subset of the matrix node, forming stamping part with constant cross section and forming on the stamping thickening by precipitation of the remaining part of the workpiece, characterized in that the part of the matrix node is placed in the container from a pair of planes, and the draught of the remaining portion of the workpiece during the formation of thickening is carried out in a cavity between the mating planes of the matrix node and container which is formed by moving the matrix of the node relative to container prior to forming thickening, and the precipitate produced by the synchronous movement of the press plate and the container.

2. The method according to claim 1, characterized in that in the manufacture of forgings, having along with the specified thickening thickening on the lateral surface, using a combined matrix, and the formation of a thickening on the lateral surface is carried out in a cavity which is formed between the parts of the team matrix.



 

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FIELD: plastic metal working, possibly forging variable cross section parts by extrusion in hydraulic presses with movable container.

SUBSTANCE: method comprises steps of feeding heated blank to container; pressing out blank in container by means of pressure pad and extruding part of blank to die of die set; forming forging having constant cross section part and thickened part that is formed after upsetting remaining portion of blank; placing part of die set in container according to condition of joining their planes. Upsetting of remaining portion of blank for forming thickened part of forging is realized in cavity between joined planes of die set unit and container. Said cavity is formed due to moving die set unit relative to container before forming thickened part of forging. Upsetting operation is realized due to simultaneous motion of pressure pad and container.

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