SU1609561A1 - Method of producing thread with variable pitch - Google Patents
Method of producing thread with variable pitch Download PDFInfo
- Publication number
- SU1609561A1 SU1609561A1 SU884445625A SU4445625A SU1609561A1 SU 1609561 A1 SU1609561 A1 SU 1609561A1 SU 884445625 A SU884445625 A SU 884445625A SU 4445625 A SU4445625 A SU 4445625A SU 1609561 A1 SU1609561 A1 SU 1609561A1
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- SU
- USSR - Soviet Union
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- workpiece
- thread
- pitch
- tool
- linear dimensions
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Abstract
Изобретение относитс к машиностроению, а именно к изготовлению резьбовых изделий, и может быть использовано при нарезании резьбы в гайках. Цель изобретени - упрощение процесса нарезани резьбы за счет снижени трудоемкости процесса изменени линейных размеров заготовки. Перед нарезанием резьбы заготовку гайки на части ее высоты сжимают осевой силой, затем производ т нарезание резьбы. После удалени инструмента снимают осевую силу сжати . Усилие сжати определ ют по математической зависимости. 3 ил.The invention relates to mechanical engineering, in particular to the manufacture of threaded products, and can be used when cutting threads in nuts. The purpose of the invention is to simplify the thread cutting process by reducing the labor intensity of the process of changing the linear dimensions of the workpiece. Before threading, the blank of the nut is compressed by a portion of its height with an axial force, then threading is performed. After removal of the tool, the axial compressive force is removed. Compression force is determined by mathematical dependence. 3 il.
Description
Изобретение относитс к машиностроению , а именно к изготовлению резьбы, и может быть использовано при нарезании резьбы в-гайках.The invention relates to mechanical engineering, in particular to the manufacture of threads, and can be used in threading in-nuts.
Целью изобретени вл етс упрощение процесса нарезани резьбы за счет снижени трудоемкости процесса изменени линейных размеров заготовки.The aim of the invention is to simplify the process of threading by reducing the complexity of the process of changing the linear dimensions of the workpiece.
На фиг. 1 показано распределение напр жений по виткам резьбы и характер распределени нагрузки по виткам гайки; на фиг. 2 и 3 - нагружение заготовки гайки усилием сжати при нарезании резьбы по предлагаемому способу.FIG. Figure 1 shows the stress distribution across the threads and the nature of the load distribution across the nut turns; in fig. 2 and 3 - loading the billet nut with a compressive force when cutting the thread according to the proposed method.
Дл того, чтобы разгрузить витки резьбы болта, расположенные у отпорного торца гайки, особенно ее первый виток, в которых имеет место наибольша концентраци напр жени , ведуща к снижению сопротивлени усталости, необходимо несколько увеличить шаг резьбы гайки в районе ее опорного торца. Дл этого заготовку гайки 1 сжимают вдоль оси пуансоном 2, причем сжимающую силу прикладывают к части гайки по высоте. После чего производ т нарезание резьбы инструментом со стандартным шагом, соответствующим шагу сопр женного болта.In order to relieve the threads of the bolt located at the nut's butt-end, especially its first turn, in which the greatest stress concentration occurs leading to a decrease in fatigue resistance, it is necessary to slightly increase the nut thread pitch in the area of its bearing end. For this, the blank 1 is compressed along the axis by the punch 2, and a compressive force is applied to the part of the nut in height. After that, threading is performed with a tool with a standard step corresponding to the step of the mating bolt.
После нарезани резьбы и извлечени инструмента из обработанной гайки, снимают усилие сжати . Полученна резьба будет иметь переменный шаг-стандартный в верхней части и увеличенный в нижней части, находившийс под воздействием усили сжати .After threading and removing the tool from the treated nut, relieve the compressive force. The thread obtained will have a variable pitch-standard in the upper part and an enlarged in the lower part, which was under the influence of the compression force.
При конической форме гайки или при ее небольшой высоте, гайку следует сжимать по всей высоте, что дает тот же эффект. Но шаг в этом случае будет посто нный.With the conical shape of the nut or with its small height, the nut should be compressed to its full height, which gives the same effect. But the step in this case will be permanent.
Величину усили сжати : определ ют по формулеThe amount of compression force: determined by the formula
р 1фнф1,p 1fnf1,
где Р - шаг резьбы инструмента;where P is the thread pitch of the tool;
AI - задаваема максимальна погрешность шага резьбы гайки;AI - we set the maximum error of the thread pitch of the nut;
Аг - измеренна максимальна погреш; ность шага инструмента;Ar - measured maximum error; ness of tool pitch;
СПSP
сwith
о о ю елoh oh you ate
0s0s
Е - модуль упругости материала гайки;E is the elastic modulus of the nut material;
А - площадь поперечного сечени заготовки гайки, причём знак - беретс если измеренный шаг инструмента больше номинального , шага резьбы, + - если больше.A is the cross-sectional area of the nut blank, and the sign - is taken if the measured tool pitch is more than the nominal, thread pitch, + - if it is larger.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU884445625A SU1609561A1 (en) | 1988-05-18 | 1988-05-18 | Method of producing thread with variable pitch |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU884445625A SU1609561A1 (en) | 1988-05-18 | 1988-05-18 | Method of producing thread with variable pitch |
Publications (1)
Publication Number | Publication Date |
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SU1609561A1 true SU1609561A1 (en) | 1990-11-30 |
Family
ID=21383454
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU884445625A SU1609561A1 (en) | 1988-05-18 | 1988-05-18 | Method of producing thread with variable pitch |
Country Status (1)
Country | Link |
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SU (1) | SU1609561A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2523712C1 (en) * | 2011-04-28 | 2014-07-20 | Нитто Сеико Ко., Лтд. | Self-cutting screw |
-
1988
- 1988-05-18 SU SU884445625A patent/SU1609561A1/en active
Non-Patent Citations (1)
Title |
---|
Авторское свидетельство СССР ivfe 1348101. кл. В 23 G 1/00, 1985. * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2523712C1 (en) * | 2011-04-28 | 2014-07-20 | Нитто Сеико Ко., Лтд. | Self-cutting screw |
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