Rotary drawing of axisymmetric shells with distribution of the deformation zone

Yakovlev, S. P.; Трегубов, В. И.; Pilipenko, O. V.; Ремнев, К. С.

doi:10.3103/s1068798x15040243

Cited by 3 publications

(4 citation statements)

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“…The operations are performed in the following sequence [11,12]: cutting pipes into dimensional workpieces; machining (turning, boring); heat treatment (quenching, tempering); machining (fine turning, boring); rotary drawing (first and second transitions); crimping the thickening; low temperature annealing. Analysis of the technology of manufacturing extended axisymmetric bodies, taking into account earlier studies in the field of rotary drawing [13][14][15][16], allowed us to assume that the inner base diameter of the workpiece has a great influence on their accuracy characteristics. In a rotary drawing, the workpiece is positioned with a base hole on a mandrel fixed in the machine chuck and pressed by the center.…”

Section: Obtained Resultsmentioning

confidence: 99%

“…The developers of the technology for the manufacture of extended axisymmetric bodies using a rotary drawing, state that depending on the deformation modes, the diameter of the base hole can both decrease and increase [11][12][13][14][15][16]. Since during rotary drawing the deformation zone moves from one end of the workpiece to the other along a helical line during its rotation, it can be assumed that the rotary drawing is a bifurcation point of the technological process, in which there is no influence of previous operations on the dimensions and properties of the workpiece.…”

Section: Obtained Resultsmentioning

confidence: 99%

“…In works [16,17], it was found that the diameters of the base hole of the workpiece before (х = 116.15 +0,15 mm) and after (у = 116 +0,35 mm) the drawing obey the normal distribution law; statistical characteristics are also determined. Showing a linear relationship between x and y, which can be written as a straight line equation.…”

Section: Obtained Resultsmentioning

confidence: 99%

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Relationship of the method of obtaining the original billet with the accuracy of manufacturing of the extended axisymmetric bodies

Yamnikov¹,

Rodionova²,

Матвеев³

2020

cisisr

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A comparative description of the technology for producing blanks for the artillery shell cases or the rocket shell bodies using flat rolled stock or rolled tubular products is given. It is noted that the lower cost of flat rolled stock leads to its wider application for stamping blanks of cartridge caps or bodies, including cutting a circle from flat rolled stock, convolution and several transitions of drawing, alternating with heat treatment. It is noted that the disadvantage of this technology are the errors in the shape of the blanks, amounting to 0.75÷1.5 of the tolerance for diametrical dimensions. When machining, these errors decrease according to the laws of copying the errors, however, the anisotropy of the material of the part blank leads to the appearance of errors in the shape-ovality and curvature of the pipe, which lead to the formation of a large radial runout of the prefabricated rocket body. It has been found that the scattering fields of all output quality parameters exceed the existing tolerances: radial runout of the assembled body by 1.3 times; ovality of the middle centering bulge by 2.15 times. It is shown that the technological process of manufacturing prefabricated housings using initial blanks from flat rolled stock does not provide the required precision technology reliability. For the manufacture of monolithic extended axisymmetric bodies, hot-rolled thickwalled pipes are used as an initial billet. The operations are performed in the following sequence: cutting pipes into dimensional workpieces; machining (turning, boring); heat treatment (quenching, tempering); machining (fine turning, boring); rotary drawing (first and second transitions); crimping the thickening; low temperature annealing. Statistical studies have found a regression equation showing at a confidence level β = 0.95, dependence of the diameter of the base hole of the workpiece after drawing in from the current value of the diameter before drawing.

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Section: Obtained Resultsmentioning

confidence: 99%

Section: Obtained Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Relationship of the method of obtaining the original billet with the accuracy of manufacturing of the extended axisymmetric bodies

Yamnikov¹,

Rodionova²,

Матвеев³

2020

cisisr

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show abstract

“…Thin-walled truncated tapering axisymmetric shells, such as nozzles, fairings and deflectors take special place in manufacturing processes [1,2]. The complexity of their manufacturing is related to the possibility of corrugating, which leads to significant reduce of quality of the product and to loss of its operational characteristics.…”

Section: Introductionmentioning

confidence: 99%