SU1038047A1 - Female die for direct extrusion - Google Patents

Description

The design is suitable for the processing of metals by pressure and can be used for extruding parts with a serrated side surface.

The known matrix for spin-drip arrays containing a lead-in funnel from the surface | water-filled protrusions and extensions extending to the center and calibrating the juice l.

The disadvantage of the known matrix is its low stability, since the configuration of the lead-in funnel surface does not correspond to the true nature of the flow of a deformable metal, which, as is well known, occurs along the line fS m of slip. In addition, this matrix is not intended for the insertion of gear profile products.

A known matrix for direct injection of products, containing a lead-in crow 20 with a curvilinear surface and calibrating juice, made in the alternating protrusions and depressions 2.

The disadvantages of this well-known matrix are also its low durability and / 25 low quality of the products due to the inconsistency of the shape of the lead-in funnel surface and the nature of the flow of a deformable metal, and also due to the fact that the action of con-stroke forces is not taken into account in the form of a funnel. , Kapih influence on the configuration of the deformation zone.

The chain of the invention is the resistance of the matrix and the quality of the imprinted materials.

This goal is achieved by the fact that in the matrix for direct compression,. containing an inlet funnel with a curvilinear surface and calibrating the juice made in the alternating lateral protrusions and hollow n .

FIG. I depicts the matrix in axonometric view: a background section; Fig, 2 cross section of the matrix along the protrusion: the gear profshm; FIG. 3 shows a slip-50 lines field in a deformable metal for a direct compression process; in fig. 4 is a scheme for constructing an arc of a circle, approximately; a model deformation zone.

The matrix for direct insertion of 55. products of a toothed profile, including protrusions and depressions (Fig. I and 2), contains a lead-in funnel I, working across 2, protrusions 3, depressions 4, and protectors formed as part of a paratopic rotation, Suzhagadegos in the center of the funnel, one of the grooves is indicated in FIG. t and 2 (shown in) or in FIG. t.

The matrix works as the following cut-outs, Defor 4 The simulated stream flows towards the worker along the sku along the surfaces of the parabolic grooves cJej k and the lead-in sections) k6tn (Fig. I), and the section of metal flow along the de arc corresponding to the maximum protrusion of the protrusion the profile is the most gentle, gaining steepness when moving to the depression area, which corresponds to the section of the funnel jk C tn, with the maximum steepness going on the RP arc, which corresponds to the maximum part of the depression. Thanks to such a cohort}) of the iGuration of a mattress, the flow of metal occurs with minimal expenditure on those who have overcome external and internal friction forces both in the sides of the protrusions and in the area of the vapal gear profile; In addition, optimal forces are exerted for the lubricant layer to work without breaks, which eliminates the likelihood of being seized and, finally, the residual stresses in 1D the formed metal are reduced by eliminating obstructed deformation zones.

To build a configuration | Surface of the funnel, you must first build a generator whose outlines correspond to the boundary lines of the deformation zone, built for a given ratio of the diameters of the ciliadric receiving part and the cavities of the gear profile of the matrix, as well as taking into account the contact friction forces. Having built with this ofaz the surface profile of the lead-in funnel, on its sections corresponding to the protrusions

the serrated profile is formed by grooves having the shape of a part of a truncated parabolic, the apex of which is sprawled to the center of the base and in association with the working skid. The forming parabolocp simulates the boundary of the deformation zone constructed for a given ratio of the diameters of the cylindrical receiving part and the protrusions of the toothed profile of the matrix.

To build the entry funnel profile, methods were used to graphically draw the fields of slip lines and approximate the boundaries of deformation zones, for example, by circular arcs.

It is known that the shape of the deformation zone (Fig. 3) depends on the values of the coefficient of plastic friction ju-j. tosf, where i is the angle of exit to the surface of the family of slip lines. At ru f O, the slip line emerges at the surface at an angle (–45 (Fig. 3, curve 4) and at | Ut I, at an angle f о or Ц 9О (ibid, curves). In Fig. 3, the vertical segments 2 -2, 3-3, and 4-4 coincide with the forming dielectric receiving part of the die for direct extrusion with the ratios of the diameters of the receiving part and the working section D / 3 "2, 3 and 4. Analysis of slip line fields for process of cold direct extrusion, shows that the exit points and the boundary of the deformation zone on the walls of the matrix containers (Fig. 3, points 2, 3, 4 and 4) with different ratios and DI A are located on the straight line coming out of the point O of the intersection of the axis of the matrix with the plane of the upper edge and calibrating at an angle oil Q and a (26.5 + 28.5 fU / j) ° (in Fig. 3 the angle oi {corresponds to the value of L1 I, and the angle Luo to the value of -). Curves 1-3 are the boundaries of the deformation foci for the ratios D / c) 2.3 and 4, respectively, fU t I, and curve 4 for D / d 4 and U-j O. The boundaries of the deformation foci are outlined by complex curves that are difficult to construct in the practical design of an instrumentation. Therefore, it is advisable to approximate them with more simple lines. Mi, for example, arcs of circles. To construct an arc of a circle, MO-J separating the boundary of the deformation zone dc of a specific matrix (Djd 2, 3, 4, etc.) and a certain value r | lj (Oi- (VI) (Fig. 4) is necessary from the intersection point O the plane of the upper edge of the gauge OD and its generator O, E. to hold straight at the corner, Dttfoi. 0 (item (in Fig. 4, the angle Y DJ {corresponds to the value W -j I, and the angle y о - the value jU -j O) to the intersection with the pattern AD of the shshindrichesky receiving part of the matrix, and the straight OAi segments, or ОО AO, are chords of circular arcs simulating the boundaries of deformation points n RI, I, and jU O, respectively.From the price of a chord (point CI or C J., draw the first - to the intersection with the straight line drawn from point A (Ao) at an angle to the straight line OA and about the AO. equal to | 5 55 + gb, 5 (I - fU,) 3 °. The point of their intersection B d (Bo) n is the center of a circular arc that modifies the boundary of the deforming point. From the glasses B (B) of radius R) there is a circular arc before intersecting with point 0. Thus, in order to build the proposed matrix profile, it is first necessary to construct a feed funnel I or pn (Fig. I), corresponding to the ratio) / (Fig. 2), the gem of which is rotated to obtain the profile of the lead-in funnel I. Then an arc of a circle d e is constructed to simulate the deformation core for the sections with the Mwst ratio which is the image of the truncated paraboloid C an arc at the base equal to Bt and at the vertex - ms (Fig. I). The boundaries of the transitions k j kW from the feed funnel profile to the profile of the bore holes, as well as transitions 1 from the cylindrical to the lead-in part, are rounded off with radii selected from technological considerations (in order to obtain smooth transitions). In addition, the entire top edge of the working surface 2 is rounded (Figs. I and 2). The construction of arcs of circles corresponding to the profile of the lead-in funnel (including the groove) is carried out taking into account the value of gr-r corresponding to this process. The practical production of the profsh of the lead-in funnel and the grooves in the solid matrix can be done with a master-punch, the latter being pressed into the billet of the die. In the case of a sectional matrix, in which the number of sections corresponds to the number of teeth of the product, the manufacture of gpofiley gpofiley can be done by grinding with grinding wheels a special profile with finishing in the assembly of a cylindrical receiving part and the lead-in funnel. Due to the fact that the configuration of the lead-in funnel surface corresponds to the nature of the flow of a deformable metal taking into account the contact friction, a reduction in the load on the matrix is ensured, thereby increasing its durability by approximately 2O% and reducing the likelihood of occurrence in the past when squeezing .

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Claims (1)

DIRECT EXTRACT MATRIX, containing an ejection funnel with a curved surface and a calibrating girdle made in the insertion of alternating lateral protrusions and depressions, characterized in that, p. In order to increase its durability and quality of implements, the surface of the inlet funnel between the planes of symmetry of each two adjacent depressions of the gage belt. made in the form of part of the surface of the truncated parabola, and rotation, tapering towards the center of the inlet funnel. ZTDWT’TlS