SU994086A1

SU994086A1 - Method of producing holes in sheet blanks

Info

Publication number: SU994086A1
Application number: SU813342449A
Authority: SU
Inventors: Виктор Алексеевич Тимощенко
Original assignee: Timoshchenko Viktor A
Priority date: 1981-09-18
Filing date: 1981-09-18
Publication date: 1983-02-07

Description

1- -:. : one- -:. :

Изобретение относитс к обр.аботке листстого металла давлением и может быть использовано дл получени отверстий с чистой повергаостью среза в различных отрасл х машино- и приборостроени .The invention relates to the machining of sheet metal by pressure and can be used to produce openings with a clean cut angle in various machine-building and instrumentation fields.

Известен способ получени отверстий в листовых заготовках, заключающийс в том, что в заготовке пробивают отверстие с контуром, эквидвютантным контуру готового отверсти , и оставл ют припуск по всему контуру, а затем припуск зачищают A known method of producing holes in sheet blanks is that a hole is punched into the blank with a contour equidistant to the contour of the finished hole and an allowance is left around the entire contour and then the allowance is cleaned.

Этот способ не позвол ет добитьс необходимого качества поверхности среза .This method does not allow to achieve the required quality of the cut surface.

Целью изо зетени вл етс повышение качества поверхности среза и повышение геометрической точности получаемого отверсти .The aim of the design is to improve the quality of the cut surface and increase the geometric accuracy of the resulting hole.

Это достигаетс тем, что при получении отверстий в листовых заготовках способом, заключающимс в пробивке отверсти с припуском по всему контуруThis is achieved by the fact that upon receiving the holes in the sheet blanks by the method of piercing the hole with an allowance along the whole contour

И последук цей зачистке припуска, в процессе пробивки получают отверстке, ограниченное контуром с чередующимис uj-. ступами и .впадинами, верщины которых распологкены на эквидистантны коитуру готового отверсти лини х, рассто ние из которых от контура готового отверсти не меньше О,О51, где i - толщина заготовки, выступы и впадины имеют треугольную форму, имеют высоту О,О50 ,07-t и расположены с шагом не более 0,15t.And afterwards, in the process of punching, cleaning of the allowance is obtained to an orifice limited by a contour with alternating uj-. Stupas and valleys, the vertices of which are arranged on equidistant lines of the finished hole, the distance of which from the contour of the finished hole is not less than O, O51, where i is the thickness of the workpiece, the projections and depressions have a triangular shape, have a height of O, O50, 07 -t and are located in increments of not more than 0.15t.

На фиг. 1 показана схема образовани отверсти ; на фиг. 2 - участок отверсти после пробивки и после зачистки; на фиг. 3 - штамп дл осуществлени описываемого спосба.FIG. Figure 1 shows the hole pattern; in fig. 2 - hole area after punching and after stripping; in fig. 3 - stamp for carrying out the described method.

Пример осуществлени способа.An example of the method.

Claims

The workpiece 1 is placed on the die matrix 2 with a working hole corresponding to the contour of the required response, in particular, circular circular. Press the workpiece with a puller 3 and a punch 4 with punching and stripping 3 & steps. At first punch a hole in a limited way; The contour with alternating protrusions and depressions, and at the same time, allowance for stripping and then this allowance for stripping with a step of a punch are left around the contour. The protrusions and depressions of the punched hole and, accordingly, the penetrative punch 4 stage are triangular in shape with a height of 11 O, O5-0.07 t, where t is the thickness of the workpiece, and S pitch is no more than ODB. The tops of the protrusions and depressions formed during punching and, accordingly, the penetration punch stage is located; wives in the rain: and x, equidistant Koktur of the resulting hole, in the example described, on the circumference. The circumference, which is closest to the contour of the resulting hole and, accordingly, to the contour of the cleaning stage of the punch, is not less than 0.05t from the contour of the resulting cleaning hole. Due to the fact that the separation of this stage occurs along the broken line, the bending moment is reduced and, as a result, the bend of the separated part is reduced. This leads to a decrease in weighting of the material in the separation zone. At the second stage, when the distorted metal layer is removed, the punch-off stage is formed with a clean, without chipping, cut surface. 6 The use of this method will make it possible to obtain products with holes in the universal equipment, possessing high precision and high quality of the cut surface. The method of obtaining holes in sheet blanks, which consists in punching a hole with an allowance throughout the contour and then, characterized in that, in order to improve the quality of the cut surface, in the punching process, an opening is formed that is bounded by a contour with alternating protrusions and depressions whose tops are located on the equidistant contour of the finished hole of the line, of which the line closest to the contour of the finished hole is located at a distance of not less than 0.05 t, where t is the thickness of the workpiece, blunt and hollow have a triangular shape with a height of О, О50, 07t and a step of not more than 0.1 St. Sources of information taken into account with the expertise 1; Malov A. N. Cold stamping technologists, M., Mashinostroenie, 1969, p. 63, FIG. 23 a (prototype).