The design, manufacturing and application of Transmission Metal Spur Gear Racks represent the industrial level of a country. This paper introduces the formation history of Transmission Metal Spur Gear Rack involute tooth profile, compares the various processing techniques of cylindrical and bevel Transmission Metal Spur Gear Rack, and summarizes the four development trends of Transmission Metal Spur Gear Rack machining.

1 Introduction

Transmission Metal Spur Gear Rack is an integral part of the national emblem of the People's Republic of China, representing the basis of industry, Transmission Metal Spur Gear Rack design, manufacturing and application level represents a country's industrial level.

The design and manufacture of Transmission Metal Spur Gear Racks can be traced back to the 400 years of the mill, the use of the water tank on the regular arrangement of the stick, in order to pass power. Later, on behalf of the ancient scientific and technological achievements of the guide car is the Transmission Metal Spur Gear Rack mechanism as the core of the mechanical device, the Transmission Metal Spur Gear Rack with bronze casting. Europe's oldest mechanical clock also has Transmission Metal Spur Gear Racks, balance wheels and escapement, these institutions are the first in Europe to rely on escapement for a punctual timer. However, the ancient Transmission Metal Spur Gear Rack is made of wood or cast with metal, can only transfer the rotation between the shaft movement, can not guarantee the stability and accuracy of the transmission.

By the end of the 17th century, people began to study the movement of the Transmission Metal Spur Gear Rack tooth profile shape, many scholars in this area started with painstaking research, paid a lot of effort, and gradually formed three kinds of teeth, that is, Open line As shown in Figure 1.

1674 Danish astronomer Romer first proposed with the external cycloid for the tooth profile curve, in order to get a smooth operation of the Transmission Metal Spur Gear Rack. Outer cycloid profile is the advantage of very low sliding speed, close to pure rolling, contact stress is small, no root cutting phenomenon; the disadvantage is the center distance from the requirements of precision, stability and interchangeability is poor.

In 1765, the Swiss L. Euler proposed the mathematical basis of the analysis of involute tooth profile, and clarified the relationship between the curvature radius and the center position of the curvature of a pair of meshing Transmission Metal Spur Gear Racks. It is suggested that the involute curve is used as the tooth profile curve.

At the end of the 19th century, the principle of cutting teeth and the use of this principle to cut the special machine tools and tools have appeared, Transmission Metal Spur Gear Rack processing has a more complete means, the involute tooth shape showed superiority, involute Transmission Metal Spur Gear Rack gradually Applications accounted for an advantage. The advantage of involute tooth profile is that the involute tooth profile has a small sensitivity from the center, which can be used for various deformation and modification design. It is easy to carry out precision machining and interchangeability. The disadvantage is high contact stress, carrying capacity is not big enough, line contact, wear serious and uneven, root cut.

In order to improve the bearing capacity of the Transmission Metal Spur Gear Rack drive, service life and reduce its size, people began to study the circular tooth profile Transmission Metal Spur Gear Rack. In 1907, the British Frank Humphris (Frank Folece) first proposed a circular tooth profile; 1970, the British engineer R. M. Studer has made a US patent for double circular arc Transmission Metal Spur Gear Rack. Double circular arc Transmission Metal Spur Gear Rack is now increasingly valued by people, in the production played a significant benefit.

The bearing capacity and efficiency of the circular Transmission Metal Spur Gear Rack are high, but it is less prone to manufacture than the involute Transmission Metal Spur Gear Rack. In the modern Transmission Metal Spur Gear Rack, the involute Transmission Metal Spur Gear Rack is still the absolute majority, and the cycloidal Transmission Metal Spur Gear Rack and the circular Transmission Metal Spur Gear Rack are relatively few.

2, Transmission Metal Spur Gear Rack drive in the modern industry position

Transmission Metal Spur Gear Rack transmission is widely used, such as automotive, engineering machinery, mining machinery, port machinery, wind power, ships and defense industry, machinery and equipment manufacturing areas. Almost covers the main industry of modern industrial economy, Transmission Metal Spur Gear Rack transmission has become an indispensable industrial equipment or equipment or key components.

The "two sessions", which have been concluded shortly, have identified 100 major projects and projects implemented by the China Plan (13th Five-Year Plan) in the next five years, including equipment manufacturing, such as aero engines and gas turbines, large aircraft development and development of new generation of high speed and heavy The development of high-end CNC machine tools, the development of industrial robots, service robots, surgical robots and military robots, the development of a variety of farming conditions to adapt to the advanced agricultural products, the development of nuclear medical imaging equipment, superconducting magnetic resonance imaging system, non-invasive Ventilator and other high-performance medical, development of advanced chemical equipment, such as more than 10 items as much. This is made in 2050 to determine the development of 10 key areas of high degree of consistency, which shows the national policy of the great concern for equipment manufacturing. Equipment manufacturing industry can not be separated from the Transmission Metal Spur Gear Rack drive, high precision, high efficiency Transmission Metal Spur Gear Rack transmission is to improve the level of China's equipment manufacturing industry protection.

3, Transmission Metal Spur Gear Rack processing technology comparative analysis

According to the different Transmission Metal Spur Gear Racks, Transmission Metal Spur Gear Rack processing is divided into cylindrical and bevel Transmission Metal Spur Gear Rack processing two categories. Cylindrical Transmission Metal Spur Gear Rack processing mainly processing a variety of cylindrical Transmission Metal Spur Gear Racks, racks, worm Transmission Metal Spur Gear Rack. Commonly used methods are hobbing, teeth, milling, shaving, crowding, tooth, etc .; bevel Transmission Metal Spur Gear Rack processing is divided into linear bevel Transmission Metal Spur Gear Rack processing and curve bevel Transmission Metal Spur Gear Rack processing, mainly for processing straight teeth, helical teeth , Bevel teeth and extended trochoidal Transmission Metal Spur Gear Racks. Commonly used bevel Transmission Metal Spur Gear Rack planer, bevel Transmission Metal Spur Gear Rack teeth, bevel Transmission Metal Spur Gear Rack teeth and so on.