SU1404217A1 - Automatic machine for thread cutting - Google Patents

Abstract

The invention relates to a machine tool industry and can be used to cut internal threads of a predominantly small diameter in difficult-to-machine materials. The aim of the invention is to increase productivity and expand technological capabilities by increasing tool life, cutting conditions and simultaneously cutting threads in parts with different pitch. The automat includes a housing 1 in which a spindle 2 is mounted, which is connected with the drive. The spindle 2 is made in the form of an ultrasonic double-sided head and contains intertwined and fixed between 15 metal-fixed 15 and rotary 16 disks with holes symmetric with respect to the axis and mounted between the piezo-ceramic disks 13 and the concentrators 14. The rotary disks 16 are kinematically connected through differentials 18 and 20 with gears 10 and drive 6. Clamping mechanisms 8 are mounted on gears x 10 with the possibility of axial movement under the action of spring 9. 3 silt, s (L

Description

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The invention relates to a machine tool industry and can be used to cut internal threads, preferably of small diameter, in details of hard-to-machine materials,

The purpose of the invention is to increase productivity and expand technological capabilities by increasing tool life and cutting modes when cutting threads in small-diameter nuts from hard-to-machine materials and simultaneously cutting threads in parts with different steps.

Fig, i shows a diagram of the machine; in fig. 2 is a section A-A in FIG. 1 in FIG. 3 - spindle.

The machine includes a housing 1, in which a spindle 2 is mounted carrying a gear 3, which is connected to a rotational drive 6 by means of gears 4 and 5. The spindle 2 is installed with the end with a smooth surface “x” in the sliding bearing, and the other, with a threaded external thread b, is inserted into the nut 7 fixed on the body 1 of the automaton, forming a copier pair. The spindle 2 is located between two workpiece clamping mechanisms 8, installed with the help of springs 9 with the possibility of axial movement in the driven gears x 10, connected by means of gear wheels 11 and electromagnetic safety couplings 12 with rotational drive 6. The spindle 2 is made in the form of a two-sided ultrasonic head and contains interfaced metal fixed 15 and rotary 16 disks interconnected with each other and mounted between piezoceramic discs 13 and concentrators 14, fixed holes 16, which are symmetrical and symmetrically located with respect to the axis of the spindles. connected by means of differentials 18 via gears 19, differentials 20 and gears 11 with driven gears 10 and with a 6 rotation drive. In the body 1 of the machine installed limit switches 21, limiting the movement of the tap sh.

The automaton works as follows.

When turning on the drive 6 rotation through the safety clutch 12, the gear wheel 11 and the driven gear10

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nude 10 is transmitted to the clamping device 8 with the workpiece, and through the gears 5, 4 and 3 - to the spindle 2. When the spindle 2 rotates in the fixed nut 7, it axially moves relative to the body 1 of the machine, which ensures the axial feed of the tap 22.

Rotation of the workpiece and the tool in opposite directions (due to the introduction of the p-razitnogo gear wheel 4) ensures the maximum cutting speed. As the cutting resistance moment increases (as the tap is deepened or for another reason), the safety clutch link 12 slides relative to the lead, and the rotational speed of the workpiece decreases. When changing the speed of rotation of the workpiece, the differential 20 rotates the gear wheel 19 at a speed directly proportional to the amount of change in the speed of rotation of the workpiece, the differential 18, adding this speed to the speed of rotation of the spindle, turns the disk 16 relative to the disk 15 by an angle proportional to the change of speed, so that when the speed of rotation of the workpiece decreases, the holes 17 on the disks 15 and 16 move to coincidence, which leads to an increase in the amplitude of the tool oscillations, a decrease in the speed of the cutting resistance moment and, accordingly, to an increase in cutting speed. Thus, the cutting speed is automatically set to the maximum possible for these conditions.

Upon reaching the limiting value of the moment of resistance installed on the safety clutch, the latter disconnects gears 10 and 11 from the engine. In this case, the workpiece begins to rotate from the tap 22 at the same speed. And in the same direction, thread cutting is stopped, and the workpiece, compressing the spring 9, moves with the tool until the end switch 21 activates the reverse. When the reverse occurs, the tap 22 is inflated out of the cut thread and at the same time threading the counter-. In the opposite position a tap 22, which practically excludes idle.

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Claims (1)

Invention Formula A threading machine with a double-sided spindle with an axial movement mechanism, kinematically connected with the drive of the machine and located between the two mechanisms for clamping workpieces, kinematically connected with the drive of the machine through a safety coupling and installed coaxially with the tool spindle, It is due to the fact that, in order to increase productivity and expand technological capabilities, the machine is equipped with a system of differentials and two gears on the one hand, automatically connected with the drive of the automaton, and on the other with the mechanisms of the clamping of workpieces, which are installed with the possibility of axial movement, when the automaton is equipped with two pairs of piezoceramic discs mounted on the spindle and two pairs of metal spindles mounted at the two ends of the spindle holes, symmetrically located about their axes, with one of the disks in each pair installed with the possibility of rotation and kinematically connected with the drive of the machine through a system of differentials. M