SU774735A1

SU774735A1 - Tool for cross-wedge rolling

Info

Publication number: SU774735A1
Application number: SU782640066A
Authority: SU
Inventors: Александр Михайлович Рыклин; Юрий Петрович Ромадин; Герман Прокопьевич Тетерин; Федор Филиппович Дубяга; Михаил Яковлевич Калачинский
Priority date: 1978-07-04
Filing date: 1978-07-04
Publication date: 1980-10-30

Description

вой, определ емой соотношением т- - текущее значение ргщиуса заготовки в зоне обжати ; радиус исходной заготовки рещиус заготовок после пр катки ; длина зоны обжати ; текущее значение абсциссы измен ющеес от О до t. Эта зависимость получаетс из следующего соотношени : выпукла п верхность описана кривой, определ емой зависимостью jicoai c где г - текущее значение радиуса заготовки в зоне обжати fW любой наперед заданный за кон распределени относит ных единичных обжатий по не зоны обжати ; посто нные интегрировани определ емые из граничных условийhowling, determined by the ratio of t- - the current value of the feed billet in the area of reduction; the radius of the original billet reschius billets after rolling; the length of the compression zone; the current value of the abscissa varies from 0 to t. This relationship is obtained from the following relationship: the convex surface is described by a curve determined by the dependence jicoai c where r is the current value of the workpiece radius in the reduction zone fW any predetermined distribution of the relative single reductions in the non-reduction zone; constant integrations determined from boundary conditions

(2) (2)

где г - радиус исходной заготовки;where r is the radius of the original billet;

г - радиус обжатой части заготовки после прокатки;g - the radius of the compressed part of the workpiece after rolling;

- длина зоны обжати . По зависимости (1) можно расчитать профиль образующей боковой деформируюцей поверхности, обеспечиваю (ций любое наперед заданное распределение единичных обжатий t д.(iC) (где U - абсолютна величина единичного обжати ). - the length of the compression zone. According to (1), it is possible to calculate the profile of the lateral surface forming a surface, providing (for any given distribution of single reductions t d (iC)) (where U is the absolute value of a single reduction).

В качестве первого приближени к оптимальному варианту можно распределение единичных обжатий по длине зоны обжати прин ть равномернымAs a first approximation to the optimal variant, the distribution of single reductions along the length of the reduction zone can be made uniform

(3)(3)

(х. const(h. const

Подставка услови (3) в зависимость (1), интегрирование и использование граничных условий (2) дастThe support of condition (3) to dependence (1), integration and use of boundary conditions (2) will give

У- тY-t

Профиль образующей боковой деформирующей поверхности, расчитаннойProfile forming lateral deforming surface, calculated

Claims

Invention Formula

0 A tool for cross-wedge rolling containing a deforming wedge with FoIiU1iruyuschie and Kshibrukimi edges, characterized in that, in order to improve the quality of rolled billets and increase the efficiency of the process, the formacade face is made with a convex surface in the cross section of the described curve, the shape of which is determined by the ratio

% FF

current radius value

where r is the curve describing the cross section of the forming face of the tool; radius of the original billet; radius of the workpiece after rolling;

g

the length of the compression zone; current abscissa value,

X varies from O to t. Sources of information taken into account during the examination 1. Makumok EM Cross-wedge rolling. Minsk, Science and Technology, 1974, p. 8-9. according to the formula (4), ensures uniform distribution of single reductions along the length of the reduction zone. FIG. 1 is given the deformation scheme of the deforming wedge; in fig. Fig. 2 shows the known and described profiles (straight line 1 shows the known straight line profile, curve 2 shows the profile of the lateral surface forming the formula (4); Fig. 3 shows the known and described dependencies of the distribution of unit reductions (curve I shows the distribution of unit reductions with the linear side forming surface, the AND curve — with a pattern calculated by the formula (4). These calculations were made with mm, g 10 mm, wedge angle equal to 9 Using a new profile forming a lateral deforming surface working tool (wedge) reduces the uneven distribution of single reductions along the length of the zone of reduction, increase the total reduction of the workpiece without destroying its axial zone, improves product quality, reduces the unevenness of tool wear and increases its durability.