RU1814994C - Thread cutting chuck - Google Patents

Abstract

Usage: the chuck provides threading without jamming the threading tool. SUMMARY OF THE INVENTION: the cartridge comprises a housing 1, a ball safety coupling, one coupling half 5 of which is axially movable and spring-loaded with a spring 4, and the other half coupling 6 is stationary. The pin 8 is fixed to the pin 3 inside the sleeve 2. During the threading process, in case of overloading the tool 9, the safety clutch is activated and the thread cutting process is stopped. When the coupling half 5 is turned relative to the coupling half 6, the balls 11 again pop into the grooves 12. The shape of the grooves 12 provides a sharp movement of the coupling half 5 together with the hammer 8. The hammer 8 strikes the tool shank. 3 ill.

Description

The invention relates to mechanical engineering and can be used for cutting internal threads and drilling deep holes.

The purpose of the invention is to increase the efficiency of thread cutting by preventing jamming of the tool.

The goal is achieved. that in the device containing the cartridge, rigidly connected to one of the half-couplers of the Ball coupling, the second half of which is mounted with axial displacement, the movable half-coupling is equipped with a striker mounted coaxially to the cartridge with the possibility of interaction with the tool shank, and the connecting balls of the safety coupling are mounted on its end surfaces grooves, the input bevels of which are located at right angles,

In the proposed device, the implementation of the input bevels, grooves of the coupling half at a right angle provides, when the coupling engages, a sharp axial movement of the coupling half with the striker, which, impact into the tool shank, provides oscillation of the coupling. Thus, the proposed device eliminates the need for a special source of vibrations, which greatly simplifies the design, and the imposition of vibrations on the tool only with an increase in torque significantly increases the wear resistance of the tool.

Figure 1 shows the proposed device; figure 2 is a section aa in figure 1; in Fig.3 is a section along BB in Fig.1.

The cartridge comprises a housing 1, a sleeve 2 rigidly mounted on a spindle, and through a pin Z. passing through a longitudinal groove. bushings associated with a movable spring-loaded spring 4, a half-clutch 5 of a ball safety clutch, a fixed half-clutch 6 is fixed in a chuck with a cartridge 7. The pin 8 is fixed on the pin 3 inside the sleeve 8. The tool 9 is fixed in the chuck 7 so that its shank extends beyond the end face of the cams 10 and enters the hole of the sleeve 2. The connecting balls 1T of the safety clutch are mounted in blind grooves 12 made on the end surfaces of the coupling halves, facing each other.

Entrance slopes of 13 grooves are made at a right angle. The stroke of the movable clutch is selected from the condition that the striker abuts against the tool shank when moving the movable coupling half down.

The device operates as follows, ..

When the machine drive is turned on, the housing 1 with the sleeve 2 rotates and transmits torque through the safety coupling to the cartridge 7 with thread-cutting

With the tool 9, the usual thread cutting process is underway. In case of overloading the tool, the torque increases, under the influence of which the coupling half 5 overcomes the force of the spring 4 and the connecting balls 11 come out of its grooves, interrupting the transmission of torque to the chuck. The threading process is terminated. When turning the coupling half 5 relative to the stationary coupling half 6

the connecting balls 11 again pop into the grooves 12. The absence of input bevels (making them at a right angle) ensures that the balls move into the grooves when the movable coupling half abruptly moves

together with the striker 8 down, struck the shank of the tool.

A series of strokes, applied briskly to the tool shank during rotation of the movable coupling half relatively non-stationary, provides axial vibrations of the tool, which leads to a decrease in cutting force and, accordingly, to a decrease in torque

Torque reduction results

to engage the coupling halves and continue the threading process.

The adjustment of the value of the vibrational energy is carried out by changing the preload force of the spring 4, and the adjustment

impact frequencies - due to the number of grooves performed on the ends of both coupling halves.

Thus, the proposed device is compact, easy to maintain and does not require an additional drive. Advantage.

Claims (1)

. The only fact is that the tool is not subjected to additional loads during normal cutting conditions, which increases its wear resistance. The claims A chuck for threading, comprising a housing, a ball safety coupling, one coupling half of which is rigidly connected to the housing, and the other coupling half mounted with the possibility of axial movement and spring-loaded, so that and, in order to increasing the efficiency of thread cutting by preventing jamming of the Tool, the chuck is equipped with a striker mounted coaxially with a housing and rigidly connected to another coupling half, wherein the grooves for mounting the balls, in cross section, are made in the shape of a rectangular trapezoid. Aa