scholarly journals Precision Cutting of the Molds of an Optical Functional Texture Film with a Triangular Pyramid Texture

Micromachines ◽  
2020 ◽  
Vol 11 (3) ◽  
pp. 248
Author(s):  
Huang Li ◽  
Zhilong Xu ◽  
Jun Pi ◽  
Fei Zhou
Keyword(s):  
Area Ratio ◽  
Shape Error ◽  
Average Roughness ◽  
Optical Texture ◽  
Included Angle ◽  
Triangular Pyramid ◽  
Technical Requirements ◽  
Exit Burr ◽  
Five Axis ◽  
Two Sides

Based on an analysis of the precision and preparation technology of an optical texture film with a triangular pyramid texture, the technical requirements of the original mold were determined, and precision shaping planning technology was adopted to process the original mold. The shape error of the optical texture mold of the triangular pyramid was assessed by defining the area ratio of the retro-reflection. The influence of the tool nose radius and exit burr on the area ratio of the retro-reflection were analyzed. By optimizing the cutting tools, cutting materials and cutting boundaries, a five-axis ultra-precision machining system was used to plan the triangular pyramid structure with a base length of 115 µm and an included angle between two sides of 70.5°. The experimental results indicate that the dimension error of the triangular pyramid element is less than 1 µm, the angle error of the included angle between two sides is less than 0.05°, and the average roughness of the side of the triangular pyramid can reach 9.2 nm, which satisfies the processing quality requirements of the triangular pyramid texture mold.

Electric Machine Technology Needs Analysis of the Linear Motor

2014 ◽  
Vol 490-491 ◽  
pp. 1138-1141
Author(s):  
Yu Ping Zhao ◽  
Yu Hai Xu
Keyword(s):  
Control System ◽  
Machine Tool ◽  
High Speed ◽  
Linear Motor ◽  
Test System ◽  
Electric Machine ◽  
Special Role ◽  
Technical Requirements ◽  
Drive Control ◽  
Five Axis

This article is in view of the linear motor aspects of application development in the field of electric machine tool equipment technical requirements analysis, linear motor with its high speed and high acceleration transmission has been in processing center, CNC milling machine, lathe, grinding machine, compound machine, laser is widely used in machine tools and heavy machine tool, in the aerospace, automotive, mold, energy, general machinery in areas such as plays a special role. Linear motor has precise control test system, reasonable matching of the technical indicators, to make it on the electric machine driven by linear motor can realize stable precision mobile and linear motor used for electric spark machine tool is another innovative application achievement of the modern advanced manufacturing industry. Domestic electric machine mostly adopts five axis NC gear rack drive control system, using the linear motor drive control system was still in the stage of research, to promote the linear motor is widely used in the field of electric machine, and the demand analysis.

A Strategy For Avoiding A Hidden Trap In Trigonometry

1982 ◽  
Vol 75 (6) ◽  
pp. 502
Author(s):  
James P. Herrington
Keyword(s):  
Included Angle ◽  
Two Sides

The solution of an oblique triangle, given two sides and the included angle, can contain a hidden trap often overlooked by both students and textbooks. If one of the unknown angles is obtuse, it is possible to obtain an erroneous solution for the triangle.

Motion Tuning Method of Linear Axes and Rotary Axis Under a Constant Cutting Speed Vector at End-Milling Point With a Five-Axis Controlled Machining Center

2015 ◽  
Author(s):  
Takamaru Suzuki ◽  
Takakazu Ikegami ◽  
Takayuki Akai ◽  
Toshiki Hirogaki ◽  
Eiichi Aoyama ◽  
...  
Keyword(s):  
Surface Quality ◽  
End Milling ◽  
High Surface ◽  
Cutting Speed ◽  
Surface Shape ◽  
Feed Speed ◽  
Shape Error ◽  
Rotary Axis ◽  
Machining Center ◽  
Five Axis

Recently It is difficult to maintain the high surface quality ingenerating curved surface shape under five-axis controlled end-milling. In this study, we aimed at maintaining feed speed vector at milling point by controlling two linear axes and a rotary axis with a five-axis machining center, to improve machined surface quality and suggested a method for solving shape error of machined workpiece considering differences of three axes’s sarvo characteristics. As the results, it could be seen that shape error greatly decreased based on the proposed method.

Cosine Triples

1976 ◽  
Vol 69 (2) ◽  
pp. 119-124
Author(s):  
Charles G. Moore
Keyword(s):  
The Other ◽  
Included Angle ◽  
The Law ◽  
Law Of Cosines ◽  
Two Sides

This investigation of cosine triples was instigated by a chance observation. For years I have used triangles with integral sides for the purpose of quizzing students on the law of cosines. The law of cosines states that the square of the length of any side of a triangle is equal to the sum of the squares of the lengths of the other two sides minus twice the product of the lengths of those two sides and the cosine of the angle between them. For example, given the triangle with sides 6 and 7, and included angle 20 degrees, the student is expected to find the remaining side using the law of cosines (fig. 1).

II. Technical Requirements

1945 ◽  
Vol 39 (6) ◽  
pp. 1126-1137
Author(s):  
Gerhard Colm
Keyword(s):  
Government Policy ◽  
Full Employment ◽  
Free Enterprise ◽  
Final Solution ◽  
Planned Economy ◽  
Technical Requirements ◽  
The Government ◽  
High Level ◽  
Two Sides ◽  
Level Production

Maintaining high-level production and employment is widely recognized today as a desirable objective of government policy. Those who oppose the government's accepting express responsibility for the achievement of this objective insist that government in a free-enterprise economy is not equipped to live up to such a responsibility. Criticism comes from two sides. Protagonists of a laissez-faire economy fear that a government pledged to assure full employment will be driven into more and more planning and regimentation. Protagonists of a planned economy, on the other hand, insist that any attempt to solve the problem of full employment within the framework of free enterprise will be futile. They fear that such an effort will only delay the transition to a planned economy, which they believe is the only final solution of our economic and social problems. Both kinds of critics maintain that the technical requirements of a policy designed to maintain full employment are incompatible with a free-enterprise economy.What, then, are the technical requirements of a policy of full employment? Is the government equipped, or can it be equipped, to do the job without paying the price of adopting a regimented economy? Perhaps those who speak of full employment in a free-enterprise economy are driven into the same dilemma in which the oldster found himself when telling his grandchild about the alligator chasing the frog. The frog jumped from the log into the river, swam through the river, hopped on land—the alligator coming closer and closer. When the alligator finally cornered the frog under a tree and opened his mouth to swallow him, things were getting desperate for both frog and story-teller. The old man knew only one solution: “The frog looked up and Baw the tree and just as the ‘gator's jaws were closing down, the frog flew up into the tree.” “But Grandpa,” said the little boy, “frogs can't fly.” “‘Deed they cain't, Son, ‘deed they cain't,” was the answer, “but this frog flew … he had to.”

scholarly journals XI. A proposed Improvement in the Solution of a Case in Plane Trigonometry

1826 ◽  
Vol 10 (1) ◽  
pp. 168-170
Author(s):  
William Wallace
Keyword(s):  
Present State ◽  
Considerable Improvement ◽  
Mathematical Science ◽  
Included Angle ◽  
The Third ◽  
Two Sides ◽  
Made In ◽  
Elementary Theories

In the present state of mathematical science, cultivated as it has been, with assiduity, during the two preceding centuries, it can hardly be expected that any considerable improvement remains to be made in Plane Trigonometry, one of its most elementary theories. There is, however, one case in the resolution of oblique-angled triangles, which appears to me to admit of a solution somewhat more simple and convenient than those which are commonly known; it is that in which two sides and the included angle are given to find the third side.

Improved Accuracy of a Machining Tool With a Constant Cutting Speed Vector and Outside Approach Path

2020 ◽  
Author(s):  
Takamaru Suzuki ◽  
Shoya Iwama ◽  
Toshiki Hirogaki ◽  
Eiichi Aoyama ◽  
Takakazu Ikegami ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Cutting Speed ◽  
Feed Speed ◽  
Actual Process ◽  
Shape Error ◽  
Direct Drive ◽  
Wireless Internet ◽  
Machined Surface ◽  
Machining Center ◽  
Five Axis

Abstract A five-axis machining center is equipped with a direct drive motor on a rotary axis and is capable of synchronous control, which makes it a feasible tool for quickly and accurately machining complicated three-dimensional surfaces such as propellers and hypoid gears. However, the accuracy of the machined shape and consistency of the freeform machined surface both need to be improved. We developed a method for maintaining the feed speed vector at the milling point by controlling three axes of the five-axis machining center (two linear and one rotary) to improve the quality of the machined surface considering differences in the servo characteristics of the three axes during the actual process. Experimental results showed that using the proposed method with an outside approach path for the machining tool greatly reduced the shape error. The effectiveness of the proposed method was verified by using a wireless Internet of Things holder to monitor the machining force.

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