SU1378986A1 - Method of manufacturing parts of shell type - Google Patents

Abstract

The invention relates to the field of metal forming, namely, to the demolition of rotary stretching of deep shell parts of complex geometric shape on CNC machines. The purpose of the invention is to increase productivity due to the intensification of stretching. A round sheet blank is installed and fixed on the end of the mandrel. By turning on the machine spindle, the workpiece is deformed by reciprocating movements of the pressing tool in several passes. For each straight stroke on the billet, a conical section is obtained, and for each reverse stroke, two adjoining conical sections with a zone of conjugation along the radius, spaced at a given distance from the beginning of the conical surface of the section obtained during the direct course. Then, the part is smoothed at this distance, after which the next transition is carried out. The method provides for obtaining deep shell parts of complex geometric shapes. This eliminates the breakage of the workpiece in the area of the transition of the bottom part into the wall of the part and the corrugation of the free flange of the workpiece. 2 Il. with (L

Description

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The invention relates to the processing of metals by pressure, in particular, to methods for the rotary extrusion of deep shell parts of geometrical geometry on CNC machines.

The purpose of the invention is to increase the productivity of the process due to the intensification of the exhaust on CNC machines.

FIG. 1 shows the design of the method implementation; in fig. 2 shows a scheme for manufacturing a housing part according to the proposed method.

The method of manufacturing parts such as shells includes a multi-pass rotary drawing with thinning of parts from the workpiece by reciprocating movements of the pressing tool. At the site of the forward stroke on the workpiece, they form a conic section 1 with a length f ,, and during the reverse course it is redeformed with the formation of two conical sections 2 and 3 that intersect each other along the radius of the conical sections 2 direct movement, at a distance of f .t, is carried out by smoothing 1 conic surface area of E at () In the value of Pjji O1fed. 1 out of dependence

5P1f

where is 1,

the angle of inclination of the conical section of the workpiece, obtained by the direct course of the tool, chosen depending on the initial thickness of the workpiece and the wall thickness of the part from the expression

J u

 - wall thickness of the part; t - the thickness of the original z.ovotovki; Еg, is a stretching tag obtained for one reciprocating tool stroke, determined by the externally established dependence Efr, (5-6) t ”; Rr is the radius of the profile of the pressing tool 5;

n is the number of passes of the pressing tool.

Example. Detail-casing of sheet blanks diametro.m 640 mm and thickness 2.mm mm steel 08 KP with a wall thickness of 1 mm is made on a lathe. The blank 4 is installed and fixed on the end of the mandrel 5 fixed in the rod of the machine. The rotational speed of the workpiece is 500 rpm; feed roller 6 when deformi.

ration 400 mm / min; draw step 9 mm; the angle of inclination of the conic sections is ° 48 °. After the product is preformed, the tool is returned to its original position and the part is calibrated on the mandrel by means of smoothing.

The arrows in FIG. 1 and 2 show the direction of movement of the pressing tool when the workpiece is deformed. Positions 7-9 ... 26-28 (position 10-25 not listed) show the inflection points of the workpiece in the manufacture of the product.

Claims (1)

Invention Formula A method of manufacturing parts such as shells by means of a multi-transition rotary drawing with thinning of the disk blank by reciprocating movements of a pressing tool with subsequent calibration on the mandrel, characterized in that, in order to increase productivity due to the intensification of drawing on CNC machines each crossing on the run they form a conical section with length x2 on it, and during the reverse course it is reformed to form two conical sections with radius conjugation between each other with a interface zone located at the distance E from the beginning of the conical surface, after which the area of the conic surface is smoothed with the length l, the value of L is determined from the dependence five ; where r h 0 five where 13 - t 0 five E; R. p (d) 24-51p p 2Gz2G:,; + G9 (G + Rp) | -Gd sin (f radius of the bottom part of the part; the angle of inclination of the conical surface of the workpiece in the process of its shaping in the tool's forward stroke, selected depending on the initial thickness of the workpiece and the wall thickness of the part from the expression sin f - to part wall thickness; wall thickness of the original billet; the draw rod obtained in one reciprocating pass of the tool, determined from the experimentally established dependence 1 l (5-6) to; pressure profile radius; the number of passes of the pressing tool. 1 Jil a Figg