SU1310058A1 - Method of extruding rod-type parts - Google Patents

Abstract

The invention relates to pressure treatment of metals. The purpose of the invention is to reduce deforming forces, increase tool life and quality of the parts produced. Before direct extrusion of core parts, a billet in the form of a cylinder is obtained, on the whole side surface of which closed annular grooves are made, for example, oval, and the deformation process is carried out in two stages in one press stroke, and in the first stage, the billet is reduced along the protrusions with the degree of deformation 0.15-0.20 when it is pushed into the die, in the second stage, direct extrusion is carried out. When the workpiece is reduced at the first stage of deformation, the protrusions are crushed and, in their place, are formed in a manner preventing the displacement of grease from the grooves. 6 Il. with (L el 00

Description

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The invention relates to the processing of metals by pressure and can be used to extrude core parts.

The aim of the invention is to reduce energy costs.

Fig. 1 shows the first deformation stage — reduction of the workpiece; in fig. 2 - node I in figure 1; in fig. 3 shows the node T T in FIG. 1, after being reduced in FIG. 4 - the second stage of deformation - direct extrusion of the part; in fig. 5 shows a PT assembly in FIG. A (prior to extrusion); in fig. 6 shows the assembly 1U in FIG. 4 (after extrusion),

The method is carried out as follows.

A special blank with closed annular grooves A (Fig. 1) is obtained from the initial billet. The circular grooves on the billet are made by plastic deformation, for example, by means of rolling rollers. Then the special billet is annealed, phosphated and saponified. Immediately prior to stamping, a liquid lubricant is applied to the workpiece, for example, by dipping. As a lubricating medium, for example, castor oil, glycerin, a consistent mixture of molybdenum disulfide or powdered graphite with mineral oil, and others can be used.

The diameter of the projections of the special billet D is chosen so that when pushing it into the matrix 1 through the centering arm 2, the reduction process is carried out from the segment 1) 10 deformations 0.15-0.20. The diameter of the cavities D, zybirshe 1 so that after the reduction of the gripping blanks in the matrix 1, the grooves A, filled with the lubricating medium (Fig. 1) are preserved. The thickness of the lubricant layer in the grooves A may be 0.05-0.5 mm, depending on the viscosity of the lubricant, the rate of deformation, the yield strength of the deformable. metal size and billet diameter.

When the punch 3 pushes the workpiece 4 through the shaping funnel B of the matrix 1, the protrusions B are crushed, and the excess grease is displaced from. For c-55 parts, including the receipt of the entry of billet 4 in cylindrical-cylindrical billet, on the side part of the matrix 1 on the place of the ridge surface of which are made locks cylindrical indented grooves are formed, annealing, phosphating height h, which are acted upon, saponified, applied to sealing pressures that prevent the lubricant from being displaced from the grooves A during the extrusion process, because the walls of the matrix and the side surface of the cooking are separated by a layer of lubricant throughout the entire process of extrusion and sweat and friction are brought to the m minimum. This is especially important when issuing core parts from high blanks (H 3 P), when, due to the significant effect of friction,

extrusion becomes impossible I

In the extrusion process in the region

of the shaping funnel E, the contact pressures increase, the lubrication from the annular grooves is displaced onto the surface of the funnel and the calibrator on the surface and thereby ensures an optimal friction regime close to hydrodynamic,

Example. The core part is made of 15X steel as follows. From the original billet, any rollers make a special billet. Then, this preform is annealed, phosphated and washed according to the well-known conditions. They are lubricated with a mixture of molybdenum disulfide with mineral oil, placed in a matrix and defamed in two stages: in the first stage, the preform is reduced to a diameter D, 8 from the diameter D 8.5 mm. mm, in the second stage, the process of extrusion of a rod with a diameter of 5 mm is carried out. The force of issuing the pouring on display of the 1st force-measuring device was 11.3 tf, IIpi squeezing the same part by a known method, the force of issuing the seam was 14.2 tf, and during the extrusion of the first part

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Poins), made of steel Р6М5 and heat-treated for hardness NS 59 - 61, subjecting it to slumping and bending in the middle of HGii. Thus, the extrusion force of the proposed method is 20-25% lower compared to a known method.

Claims (1)

Claim method: Extrusion rod 1 sealing pressures that prevent the lubricant from displacing from the grooves A during the extrusion process, So the matrix walls and the side surface of the workpiece are separated by a lubricant layer during the entire extrusion process and friction loss is minimized. This is especially important when extruding core parts from high blanks (H 3 R), when due to the significant effect of friction extrusion becomes impossible .. I In the extrusion process in the field of the shaping funnel E, the contact pressures increase, the lubrication of the annular grooves is displaced onto the surface of the crater and the calibrating friction, and thus provides an optimal friction mode close to hydrodynamic, Example. The core part of the steel 15X is made as follows. From the original billet knurled rollers receive a special billet. Then, the billet is annealed, phosphated, and washed by known modes Mj are smeared with a mixture of molybdenum disulfide with mineral oil, placed in a matrix and deformed in two stages: in the first stage, the billet is reduced to D, 8 mm in diameter from D 8.5 mm to The second stage involves the extrusion of a rod with a diameter of d 5 mm. The extrusion force on the display of the 1st force-measuring device was 11.3 tf, IIpi squeezing the same part by a known method, the force ejecting the seams was 14.2 tf, and during the extrusion of the first part details, including the production of a cylindrical billet, on the side surface of which there are made closed grooves, annealing, phosphating, saponification, application on Poins), made of steel Р6М5 and heat-treated for hardness NS 59 - 61, subjecting it to slumping and bending in the middle of HGii. Thus, the extrusion force of the proposed method is 20-25% lower compared to a known method. Claim method: Extrusion rod 1 the surface of the workpiece lubrication and subsequent deformation, characterized in that, in order to reduce energy consumption, the grooves are performed along the entire length of the side surface of the workpiece, and the process of deformation is carried out in two stages in one working stroke; in this case, in the first stage, the workpiece is reduced along the protrusions between the grooves with a degree of deformation of 0.15-0.20 by pushing it into the matrix, and in the second stage, direct extrusion is carried out. Phage. Fig.Z FIG. five FIG. 6 FIG. H (leave; uj L. Quick Editor H, 1Te-ed V. Kajr's extract Order 1819/7 Circulation 733 Subscription VIISHI State Government: USSR Committee by icho (;) and discoveries, Mo (chva, li-35, Raushsk shares., j ,,) Production of a single-numbered ticker frnif perception, Uzhgorod, v., I .11; orkt1 a, Proofreader A.TiicKO