Concept of a New Method for Helical Surface Machining on Lathe

2017 ◽  
pp. 235-241
Author(s):  
Dániel Kiss ◽  
Tibor Csáki
Keyword(s):  
New Method ◽  
Helical Surface ◽  
Surface Machining

Facetting value of helical thread surface received by enveloping

2021 ◽  
pp. 35-38
Author(s):  
Е.В. Глушко ◽  
О.В. Арестов ◽  
Ю.Я. Фершалов
Keyword(s):  
Surface Roughness ◽  
New Method ◽  
Roughness Parameters ◽  
Helical Surface ◽  
Normal Line ◽  
Thread Surface ◽  
Joint Surfaces ◽  
Metal Treatment ◽  
Line Level

В морской технике применяются различные резьбовые соединения. Детали судовых механизмов подвергаются в процессе работы вибрациям и переменным нагрузкам, которые приводят их к разрушениям, потере герметичности и к внеплановым остановкам судовых машин.. Для повышения эксплуатационных свойств и увеличения срока службы резьбовых соединений проводят анализ качества сопрягаемых поверхностей, в частности, параметров шероховатости. В предлагаемой статье исследуется величина огранки винтовой поверхности резьбы образующаяся при осуществлении нового метода изготовления резьбы огибанием. Процесс обработки металла, к которому относится новый метод нарезания, заключается в касании лезвия инструмента и обрабатываемого материала прерывистым касанием. Нарезание резьбы осуществляется, специальной червячной фрезой. При прерывистом резании обрабатываемая поверхность оказывается, как бы составленной из отдельных криволинейных площадок (граней), Линия стыка граней имеет определенную высоту по нормали к поверхности, при нарезании резьбы - к винтовой поверхности. Высота стыка граней определяет качественный показатель шероховатости поверхности, называемый волнистостью. При нарезании резьбы червячной фрезой высота стыка граней (волнистость винтовой поверхности) зависит от числа зубьев фрезы. Задача исследования состоит в том, чтобы выяснить, каким должно быть число зубьев фрезы для получение заданной шероховатости винтовой поверхности резьбы и как это влияет на качество поверхности резьбы. Так же в статье рассмотрено графическое описание процесса получения огранки резьбы и пример расчета числа гребенок фрезы. There are many different thread joints used on marine facilities. While in operation, components of the mechanisms undergo vibrations with repeated stresses that leads to their failures, loss of tightness, and unscheduled shutdowns of the equipment. The analyses of joint surfaces quality, e.g. roughness parameters, are conducted to enhance serviceability of the thread joints and to prolong their lifespan. The article studies facetting value of a helical thread surface while applying a new method of thread production – enveloping. The new method of cutting that is a process of metal treatment involves non-continuous contacting an instrument blade and the material being cut. The cutting of the thread is done with a special hob cutter. Due to the non-continuous cutting, a treated surface becomes as if consisting of curved pads or faces. The faces junction line has a specific normal line level towards the surface and towards the helical surface during the cutting. The height of the junction defines qualitative indicator of the surface roughness known as undulation. When cutting the thread with a hob cutter the height of the faces junction - undulation of a helical surface – depends on a cutter teeth number. The research objective is to specify the cutter teeth number needed to achieve the required roughness of a thread helical surface as well as to determine how it influences on the quality of the thread surface. The paper also provides several drawings illustrating the process of obtaining the thread facetting and the example of calculation of a cutter chaser number.

Rotary Contact Method for 5-Axis Tool Positioning

2012 ◽  
Vol 134 (2) ◽  
Author(s):  
Wengang Fan ◽  
Xiaochun Wang ◽  
Yonglin Cai ◽  
Hong Jiang
Keyword(s):  
New Method ◽  
Open Form ◽  
Contact Method ◽  
Machining Simulation ◽  
Surface Machining ◽  
Tool Positioning ◽  
Positioning Algorithm ◽  
Toroidal Cutter ◽  
Multipoint Machining ◽  
Offset Surface

In this paper, a new 5-axis tool positioning algorithm called the rotary contact method (RCM) for open concave surface machining using the toroidal cutter is developed. The RCM comes from the reverse thinking of multipoint machining (MPM) method and apparently distinguishes the traditional tool positioning principles, as it determines the optimal tool positions based on the offset surface instead of the design surface. The basic idea of the RCM is to determine the initial tool location first and then rotate the tool for required contact. The RCM can not only guarantee gouge-free tool positions without the additional local gouge checking and correction process but also effectively produce big machined strip width for open form surface machining just like the MPM. Besides, this new method is simple to implement. Machining simulation was performed to verify the validity of the RCM.

The Development of Cutter Location Algorithm for the 6-Axis Simultaneous CNC Abrasive Belt Grinding Complex Surface

2009 ◽  
Vol 416 ◽  
pp. 375-380 ◽  
Author(s):  
Zhi Huang ◽  
Yun Huang ◽  
Wei Wen Zhang ◽  
Yue Yu Wu
Keyword(s):  
Complex Surface ◽  
New Method ◽  
Belt Grinding ◽  
Calculation Algorithm ◽  
Surface Machining ◽  
Location Data ◽  
Abrasive Belt ◽  
Nc Program ◽  
Grinding Tool ◽  
Tool Position

This paper brings forward a new method of calculating the cutter location data for 6-axis simultaneous CNC abrasive belt grinding complex surface based on the ACIS software kit, expatiates this belt grinding tool position calculation algorithm and key technique of software development, and verifies this algorithm with turbine blade on the 6-axis belt grinder, finally summarizes this new method also be applicable to other similar surface machining NC program system.

Analytical Boundary Method for Obtaining Feed Scallop of Toroidal Cutter in Multi-Axis Milling

2017 ◽  
Vol 728 ◽  
pp. 48-53 ◽  
Author(s):  
Hendriko Hendriko
Keyword(s):  
Inclination Angle ◽  
New Method ◽  
Free Form ◽  
Scallop Height ◽  
Surface Machining ◽  
Boundary Method ◽  
Surface Profiles ◽  
Free Form Surface ◽  
Toroidal Cutter

This paper presents a new method to calculate the feed scallop height for a toroidal cutter during a free-form surface machining in multi-axis milling. The proposed method is an extended analytical boundary method to define the cut geometry during a free-form surface milling. The algorithm was developed by taken into account the existence of inclination angle. The proposed method was successfully implemented to calculate the scallop for two model parts with different surface profiles. The accuracy was verified by comparing the scallop height calculated using the proposed method with those measured using Siemens-NX. The results proved that the proposed method was accurate

scholarly journals A cutter path generation strategy for helical surface machining of screw rotor

2019 ◽  
Vol 103 (1) ◽  
pp. 003685041988218
Author(s):  
Yuchun Kuang ◽  
Wei Lin ◽  
Zongzheng Dong ◽  
Longmei Wu ◽  
Qin Wang
Keyword(s):  
Path Generation ◽  
Helical Surface ◽  
Surface Machining ◽  
Cutting Test ◽  
Cutting Surface ◽  
Cutter Path ◽  
Disk Mill ◽  
Screw Rotor ◽  
Mill Cutter ◽  
Cutter Path Generation

In this article, the disk mill cutter path generation strategy for the machining of complex helical surface via a currently developed minimal orientation-distance algorithm based on spatial discretization method is studied. The strategy proposed here is, first, to establish the helical surface and cutting surface in the unique coordinate system. Then, the two surfaces are divided into a series of parts by n equidistant planes, and the minimal orientation-distance algorithm is used to determine all the cutter locations. Finally, on the basis of Archimedes helical interpolation, cutter path is generated within the specified tolerance limit. The effectiveness of the proposed strategy is confirmed numerically and experimentally by a case of virtual cutting test in VERICUT software and actual machining. This strategy can be applied to a broad range of helical surface machining.

Selective Sampling and Orientation of Non-Homogeneous Tissues

1968 ◽  
Vol 26 ◽  
pp. 98-99
Author(s):  
C. C. Clawson ◽  
L. W. Anderson ◽  
R. A. Good
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Light Microscopy ◽  
Random Sampling ◽  
New Method ◽  
Microscope Examination ◽  
Small Areas ◽  
Selective Sampling ◽  
Large Numbers ◽  
Specific Orientation

Investigations which require electron microscope examination of a few specific areas of non-homogeneous tissues make random sampling of small blocks an inefficient and unrewarding procedure. Therefore, several investigators have devised methods which allow obtaining sample blocks for electron microscopy from region of tissue previously identified by light microscopy of present here techniques which make possible: 1) sampling tissue for electron microscopy from selected areas previously identified by light microscopy of relatively large pieces of tissue; 2) dehydration and embedding large numbers of individually identified blocks while keeping each one separate; 3) a new method of maintaining specific orientation of blocks during embedding; 4) special light microscopic staining or fluorescent procedures and electron microscopy on immediately adjacent small areas of tissue.

A new method for the determination of nitrates

1960 ◽  
Vol 23 ◽  
pp. 227-232 ◽  
Author(s):  
P WEST ◽  
G LYLES
Keyword(s):  
New Method
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