SU1263398A1

SU1263398A1 - Method of cutting off

Info

Publication number: SU1263398A1
Application number: SU853904023A
Authority: SU
Inventors: Сергей Иванович Козий; Юрий Яковлевич Панкратов; Иван Николаевич Ситник
Original assignee: Куйбышевский Ордена Трудового Красного Знамени Авиационный Институт Им.Акад.С.П.Королева
Priority date: 1985-05-28
Filing date: 1985-05-28
Publication date: 1986-10-15

Abstract

Изобретение относитс к обработке листовых материалов давлением, в частности к способам отрезки припуска на толстолистовых заготовках из слоисто-волокнистых композиционных материалов. Изобретение позвол ет повысить качество получаемых деталей и улучшить услови труда за счет предварительного рассечени припуска на несколько частей. При этом плоскости сечени перпендикул рны плоскости разделени . Обрабатываемый материал 1 зажимают накладками 2. Рассекают припуск на отдельные части. Прикладывают к припуску. усилие, направление которого перпендикул рно плоскости разделени . Затем отдел ют наход щийс под действием сжимаюш ,их усилий припуск от детали ножами 5. 2 з.п.ф-лы, 5 ил. (/) ьо О5 СО СО со ооThe invention relates to the processing of sheet materials by pressure, in particular to methods for cutting allowances on plate blanks from laminated fibrous composite materials. The invention makes it possible to improve the quality of the parts produced and to improve the working conditions by pre-cutting the allowance into several parts. In this plane, the sections are perpendicular to the plane of separation. The material to be processed 1 is clamped with overlays 2. Cut the stock into separate parts. Apply to the seam allowance. force, the direction of which is perpendicular to the plane of separation. Then, the seam allowance, which is under the action of squeezing, is separated from the part with knives 5. 2 C, ff, 5 sludge. (/) oo CO CO co o o

Description

Изобретение относится к обработке листовых материалов давлением, в частности к способам отрезки припуска на толстолистовых заготовках из слоисто-волокнистых композиционных материалов.The invention relates to the processing of sheet materials by pressure, in particular to methods for cutting allowances on plate blanks of laminated fiber composite materials.

Целью изобретения является повышение качества получаемых деталей и улучшение условий труда.The aim of the invention is to improve the quality of the parts and improve working conditions.

На фиг. 1 изображен момент фиксации заготовки в штампе путем приложения сжимающих усилий; на фиг. 2 — момент рассекания припуска на несколько частей; на иг. 3 — момент воздействия на заготовку, зафиксированную в штампе, дополнительным усилием; на иг. 4 — части штампа перед отрезкой; на фиг. 5 — то же, в момент отрезки.In FIG. 1 shows the moment of fixing a workpiece in a stamp by applying compressive forces; in FIG. 2 - the moment of cutting the allowance into several parts; on ig. 3 - the moment of impact on the workpiece, fixed in the stamp, additional effort; on ig. 4 - parts of the stamp before the cut; in FIG. 5 - the same at the time of the cuts.

Способ осуществляется следующим образом.The method is as follows.

Толстолистовую заготовку 1 из слоистоволокнистого композиционного материала фиксируют накладками 2 механизма зажима штампа с заданным усилием путем приложения сжимающих усилий. Усилие, развиваемое механизмом зажима, рассчитывают из условия обеспечения давления по всей площади контакта накладок 2 с поверхностью заготовки 1 в пределах 0,8-0,85 (б^ ).The plate preform 1 of the laminated composite material is fixed by the pads 2 of the clamping mechanism of the stamp with a given force by applying compressive forces. The force developed by the clamping mechanism is calculated from the condition of providing pressure over the entire contact area of the pads 2 with the surface of the workpiece 1 in the range of 0.8-0.85 (b ^).

Припуск, свободный от действия сжимающих усилий, рассекают последовательно на несколько частей клином 3. При этом трещина разрушения не должна достигать плоскости разделения.The allowance, free from the action of compressive forces, is cut sequentially into several parts by the wedge 3. Moreover, the fracture crack should not reach the separation plane.

После завершения процесса расслаивания припуска на последний устанавливают пуансон 4 и прикладывают дополнительное усилие, направление которого перпендикулярно плоскости разделения. При этом происходит изгиб припуска, разделенного на части, а трещины достигают плоскости разделения. Дальнейшему распространению трещин препятствует поле сжимающих напряжений, созданное механизмом зажима.After the process of delamination of the stock is completed, the punch 4 is installed on the last and an additional force is applied, the direction of which is perpendicular to the separation plane. In this case, the allowance is bent, divided into parts, and the cracks reach the separation plane. The further propagation of cracks is prevented by the compressive stress field created by the clamping mechanism.

Пуансон 4 останавливают после достижения трещин разрушения плоскости разделения и воздействуют на обрабатываемый материал ножами 5, отделяя припуск от детали. Наличие углов о/ на ножах 5 обуславливает появление дополнительных сжимающих напряжений, что препятствует образованию таких дефектов на поверхности разделения, как вырывы, расслоение и т.п.The punch 4 is stopped after reaching the fracture of the destruction of the separation plane and act on the processed material with knives 5, separating the allowance from the part. The presence of angles o / on the knives 5 causes the appearance of additional compressive stresses, which prevents the formation of defects on the separation surface, such as tears, delamination, etc.

Пример. Листовой композиционный материал ЖСП толщиной 14,8 мм, шириной 31,5 мм и длиной 53 мм фиксируют в штампе. Припуск последовательно рассекают на три равные части и отделяют припуск от детали ножами с максимальным усилием 3200 кгс. При этом качество среза удовлетворяет техническим требованиям, предъявляемым к изделиям из волокнистых композиционных материалов.Example. ZhSP sheet composite material with a thickness of 14.8 mm, a width of 31.5 mm and a length of 53 mm is fixed in the stamp. The allowance is sequentially cut into three equal parts and the allowance is separated from the part with knives with a maximum force of 3200 kgf. At the same time, the cut quality meets the technical requirements for products made of fibrous composite materials.

Изобретение позволит повысить качество получаемых деталей и улучшить условия труда.The invention will improve the quality of the parts and improve working conditions.

Claims

The invention relates to the processing of sheet materials by pressure, in particular to methods for cutting allowances on plate blanks from laminated fibrous composite materials. The aim of the invention is to improve the quality of the parts produced and the improvement of working conditions. FIG. 1 shows the moment of fixation of the workpiece in the stamp by applying compressive forces; in fig. 2 - the moment of splitting allowance into several parts; on ig. 3 - the moment of impact on the workpiece, fixed in the stamp, by an additional force; on ig. 4 - part of the stamp before cutting; in fig. 5 - the same at the time of the cut. The method is as follows. The plate blank 1 of the composite fiber material is fixed with the pads 2 of the punch clamping mechanism with a predetermined force by applying compressive forces. The force developed by the clamping mechanism is calculated from the conditions for providing pressure over the entire area, the contact of the pads 2 with the surface of the workpiece 1 in the range of 0.8-0.85 (6g). An allowance free of compressive forces is cut successively into several parts by a wedge 3. At the same time, the fracture crack should not reach the separation plane. After the delamination process is completed, a punch 4 is installed on the latter and an additional force is applied, the direction of which is perpendicular to the separation plane. When this occurs, the stock bend is divided into parts, and the cracks reach the separation plane. The further propagation of cracks is prevented by the field of compressive stresses created by the clamping mechanism. The punch 4 is stopped after the fractures of the fracture plane have been reached and the material to be treated is cut with knives 5, separating the stock from the part. The presence of an angle on the knives 5 causes the appearance of additional compressive stresses, which prevents the formation of such defects on the surface of the separation, such as tears, delamination, etc. Example. The sheet composite material GSP with a thickness of 14.8 mm, a width of 31.5 mm and a length of 53 mm is fixed in the chip. The allowance is successively cut into three equal parts and the stock is separated from the part with knives with a maximum force of 3200 kgf. At the same time, the cut quality satisfies the technical requirements imposed on products made of fibrous composite materials. The invention will improve the quality of the parts and improve the working conditions. Claim 1. A method of cutting off predominantly when starting up on thick sheets of laminated fiber composite materials, including fixing the blank in a die by applying compressive forces directed parallel to the separation plane, applying additional forces directed perpendicular to the specified, that, in order to improve the quality of the parts obtained and to improve working conditions, the allowance zone is left free of compressive forces, and before By applying additional force, the seam allowance is cut into several parts, and the cutting planes are perpendicular to the separation plane.

2. A method according to claim 1, characterized in that the stock is cut into equal parts.

3. The method according to claim 1, wherein additional forces are applied until the buckling of the cut parts of the allowance.

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