What are the structural components of the rotary center?

Center, the machine tool component in machining, there are two types: fixed center and movable center. Lathes are used to center and withstand the gravitational and cutting forces of the workpiece. The front center of the lathe The front center of the lathe can be installed directly in the taper of the spindle of the lathe, and the front center and the workpiece rotate together without relative movement, so there is no need to quench.

1) The lathe can sometimes be clamped with a three-jaw self-centering chuck, a self-made 60. The steel front tip of the taper angle. In order to prevent the displacement of the center due to the action of axial force in turning, the clamping part of the chuck on the self-made center should be made into a step type.

When the center of the lathe is removed from the chuck, it must be re-turned60 if it is used again. Cone.

2) There are two kinds of rear centers: fixed centers and rotary centers. When in use, the rear center can be inserted into the taper hole of the tailstock sleeve of the lathe. The fixed center has good cutting performance and accurate centering, but there is sliding friction between the center hole and the hard tip, which is easy to wear and burn out the center.

Lathes are therefore only suitable for low-speed machining of workpieces with high precision requirements. When the lathe supports a small workpiece, it can use an anti-center, and the end of the workpiece is made into a center type.

The movable center is equipped with rolling bearings inside, and the center rotates with the workpiece to work normally at high speeds. However, the rigidity of the live center is poor, and sometimes it will runout and reduce the machining accuracy. Therefore, live centers are only suitable for workpieces that do not require too much precision.

The fixed center supports parts with complex end faces and parts that do not allow center holes. The center is mainly composed of a thimble, a clamping device, a housing, a retaining pin, a bearing and a mandrel. One end of the center can top the center hole or the inner hole of the tube, and the other end can be a spherical or tapered part with a top end, and the center is fixed by a clamping device.

When the part does not allow or cannot make a center hole, the turning can be clamped directly with a clamping device. The shell and mandrel are drilled with pin holes, and the pins of the fixing pins are used to achieve the top dead and alive.

The center can also be used for drilling, nesting and reaming of workpieces. A kind of machine tool general machine tool attachment center, by a three-jaw self-centering chuck or a four-jaw chuck is connected to the housing through fasteners, the housing is provided with a bearing between the housing and the mandrel, and is embedded with a fixing pin, and it is characterized in that one end of the center is a pointed taper and an oblique spline that is convex externally, and the other end is a hemispherical and tapered blind hole that is concave.

There are many types of slewing centers, choose different slewing centers according to the specific conditions of use when using, the wear resistance of the slewing center is very high, there will be no damage when using the slewing center, the slewing center is often used in some large equipment, pay attention to daily maintenance when using the slewing center, so as to ensure the normal operation of the machinery.

Features of the top of the event:

1. Small outer diameter, less interference knife, suitable for high speed, moderate cutting;

2. It can be regularly filled with oil to prolong the service life.

3. It has a certain waterproof function, and it is easy to dissipate heat as a whole;

4. The use of long inclination needle roller bearing, three-point support arrangement structure rigidity, good stability.

Features of the fixed center:

1. Pre-standard tungsten carbide top center;

2. The top core of tungsten carbide is made of SK2, and the hardness reaches 75HRC2;

3. Both the top center and the body need to be precision ground to meet the requirements.

The top plane bearing of the 630 bed is broken, how to replace it.

Features of the slalom center:

1. It has a certain waterproof performance, and it is easy to dissipate heat as a whole;

2. It can be regularly injected with oil to prolong its service life;

3. The outer diameter is smaller, and the interference knife is less, which is more suitable for high speed and moderate cutting work;

4. The arrangement structure of long needle roller bearing with inclination and three-point support is adopted to strengthen its rigidity and excellent stability.

Features of the fixed center:

1. A standard tungsten carbide top core is placed in front;

2. The top center and body all need to be precision ground to meet the specified requirements before they can be used.

3. The top core of tungsten carbide is made of SK2, and the hardness can reach 75HRC2;