Numerical control programming of tubing taper

Most of the connecting parts of petroleum fittings are tubing threads with strict sealing requirements. Usually, if these products fail to meet the sealing requirements, they are considered to be unqualified. Based on this, more and more manufacturers are beginning to use CNC lathes to process such higher-demand threads. Moreover, the thread accuracy is detected using a threaded single gauge instead of a simple hydrostatic test. The main factors that usually affect the tubing thread seal are: tooth shape, taper, pitch and so on. The tooth type is now generally ensured by the use of a forming tool, and the pitch can be adjusted intuitively by a single measuring instrument, but only the taper needs to be counted.

Roller Bearing

Roller bearing, one of the two members of the class of rolling, or so-called antifriction, bearings (the other member of the class is the Ball Bearing). Like a ball bearing, a roller bearing has two grooved tracks, or races, but the balls are replaced by rollers. The rollers may be cylinders or truncated cones. Only radial loads (i.e., loads perpendicular to the axis of rotation) can be carried when the rollers are cylindrical, but with conical rollers both radial and thrust, or axial, loads (i.e., ones parallel to the axis of rotation) can be carried. A needle bearing has cylindrical rollers that are relatively slender and completely fill the space between the races; in many cases the inner race is dispensed with. Because there is line contact between a roller and the races, while in a ball bearing there is point contact, in a given space a roller bearing can carry a greater radial load than a ball bearing.

Roller bearings are used in all main shaft and auxiliary drive shaft applications to support pure radial load, and allow for axial shaft elongation due to temperature changes with no additional load effect on the bearing. They are usually located at the ends of the turbine and compressor shafts and are often mounted in a housing, but separated from it by a layer of pressurized oil known as a squeeze film damper.

In many cases, instead of having a separate inner race for roller bearings, the [inner race" is an integral part of the shaft or stub shaft. This reduces complexity, weight, and build-up of concentricity tolerances. Overall, this is cost effective, but the cost of replacement or repair is likely to be higher than for separate inner races.

Roller Bearing,Self-Aligning Roller Bearing,Double Row Roller Bearing,Neddle Roller Bearing

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