SU816604A1

SU816604A1 - Self-supporting shaped mandrel

Info

Publication number: SU816604A1
Application number: SU792763435A
Authority: SU
Inventors: Александр Андреевич Фотов; Александр Яковлевич Фролов; Геннадий Петрович Моисеев; Михаил Матвеевич Класс; Юрий Григорьевич Хороших
Priority date: 1979-05-07
Filing date: 1979-05-07
Publication date: 1981-03-30

Description

(54) САМОУСТАНАВЛИВАЮЩАЯСЯ ПРОФИЛЬНАЯ ОПРАВКА(54) SELF-INSTALLING PROFILE EDGE

1one

Изобретение относитс к обработке металлов давлением, в частности может быть использовано в трубном производстве.The invention relates to the processing of metals by pressure, in particular, can be used in pipe production.

Известна самоустанавливающа с профильна оправка, включающа зоны редуцировани и калибровани , обжимную зону с образующими граней и верщин многогранника , выполненными в виде выпукло-вогнутых кривых, сопр женных между собой и с зоной калибровани 1.A self-adjusting profile mandrel is known, including reducing and calibrating zones, a crimping zone with forming faces and vertices of a polyhedron, made in the form of convex-concave curves, interconnected with each other and with a calibration zone 1.

Недостатком известного устройства вл етс снижение качества труб, вследствие резкого перегиба образующей в зоне редуцировани оправки.A disadvantage of the known device is a reduction in the quality of the pipes, due to the sharp bending of the generators in the area of the reduction of the mandrel.

Цель изобретени - улучщение качества труб и повыщение производительности оправки .The purpose of the invention is to improve the quality of the pipes and increase the productivity of the mandrel.

Поставленна цель достигаетс тем, что образующие граней и верщин многогранника описаны идентичными кривыми, плавно сопр женными с зоной редуцировани , причем все аналогичные точки сопр жени лежат в одном поперечном сечении оправки, а касательные, проход щие через точки сопр жени кривых, образуют с осью оправкиThe goal is achieved by the fact that the faces and vertices of the polyhedron are described by identical curves that are smoothly mated to the reduction zone, all similar mating points in the same cross section of the mandrel, and the tangents passing through the junction points of the curves form with the axis of the mandrel.

угол, св занный с углом волоки соотноц/ениемangle related to die angle

У(1-).In (1-).

где d - угол волоки;where d is the die angle;

п - количество граней многогранника. На фиг. 1 изображена самоустанавливающа с оправка; на фиг. 2 - сечение оправки в точке В на фиг. 1; на фиг. 3 - сечение оправки в точке С на фиг. 1; на фиг. 4 - узел I на фиг. 1.n is the number of faces of the polyhedron. FIG. 1 shows a self-aligning mandrel; in fig. 2 is a cross section of the mandrel at point B in FIG. one; in fig. 3 is a cross section of the mandrel at point C in FIG. one; in fig. 4 — node I in FIG. one.

Предлагаема оправка выполнена с одинаковой щириной граней а. По всей длине характер образующих верщин и граней идентичен , они имеют вид выпукло-вогнутых кривых, разделенных точкой перегиба А. В случае более резкого перегиба кривые 1 Имеют в точке А касательную 2, наклоненную к оси оправки под углом /. При менее резком перегибе кривые 3 имеют вид более плавный и касательную 4 с углом Д + АД.The proposed mandrel is made with the same width of the faces a. Over the entire length, the character of the forming vertices and faces is identical, they have the form of convex-concave curves separated by the inflection point A. In the case of a more sharp inflection, the curves 1 have a tangent 2 at point A, inclined to the axis of the mandrel at an angle /. With a less sharp bend, curves 3 look smoother and tangent 4 with an angle of D + BP.

Оправка по длине состоит из четырех участков:Mandrel length consists of four sections:

ip-участок редуцировани с посто нным сечением;reduction ip-section with constant cross-section;

Claims

B and crimping areas, respectively, with concave and convex forming; k-calibrating area with constant cross section. At points B and C, the curves forming the crimping section smoothly mate with the surfaces of the reduction and calibration sections. All similar interface points, cr; 1s, between each other and with the calibration and reduction sections lie in the same cross section of the mandrel. The proposed mandrel works as follows. When the tube moves along the mandrel in the initial stage, at the moment of contact of the tube with the mandrel, there is an intense deformation along the vertices of the polyhedron. The rounded sections 5 cut into the metal, and there is no metal deformation on the face x 6 yet. Then a portion of the metal passes through the zone Ео with a convex generatrix and passes into the zone with a concave generatrix, after which it enters the calibrating zone, where the pipe receives the final profile. Smooth conjugation of curves 1 with sections of constant cross section at points B and C eliminates the bends of metal fibers, reducing the work of deformation, which helps to reduce the dragging and improve the quality of the pipes. The invention is a self-aligning mandrel with a constant face width along the length, including reducing and calibrating zones, a crimping zone with forming faces and vertices of a polyhedron, made in the form of convex-concave curves, seamlessly interconnected with each other and with a calibration zone, differing with that, with the aim of improving the quality of the pipes and increasing the productivity, forming the faces and vertices of the polyhedron are described by identical curves that are smoothly matched with the reduction zone, all similar points with The stresses lie in the same cross section of the mandrel, and the tangents passing through the points of the conjugate curves form with the axis of the mandrel the angle associated with the drawing angle with the ratio j8 o ((l--). where flt is the drawing angle; n is the number facets of a polyhedron. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 537726, class B 21 C 3/16, 1975.

(rtsg.Z

fig.if