SU140660A1 - Automatic spindle thread head - Google Patents

Description

It is known to cut threads in nuts on automatic machines without reversing the rotation of the tap and tightening the nut due to the accelerated rotation of the tool bar in which the nut is fixed.

The peculiarity of the proposed head is that the fastening of the nut is carried out without the fate of additional shiindel, by means of a movable leash, mounted concentrically with respect to the thread-cutting thread.

In order to keep the nut being cut from turning during the cutting process, the head is provided with a non-rotating arm, which is coaxial with the spindle in the axial direction.

FIG. 1 shows the kinematic diagram of the machine; in fig. 2 (a, b, c, d, d, e, and g) –p d the successive positions of shtyry, tap and nut in the thread cutting process.

The tap J is fastened in the collet 2 and rotates together with a pinch 4, which is rotatable from a gear, mounted on sub-supports 5, which are located in quintiles 6. On the second quill 7, a clip 10 from a pinion 9 is mounted on bearings 8 with two plugs m // and springs 12. Both quill are located in the housing 13 and are provided with fingers 14 and 15 with rollers. The rollers enter the profiled grooves of the cylindrical cams 16 and 17. whose rotation provides axial feeds of the piles.

The end cam 18 controls the movement of the support bars 19 on the bracket 20 provided with a roller 21 and a return spring 22, which abuts against the fixed pin 23.

The number and location of the pins 19 is selected depending on the configuration of the nut housing. For ease of feeding and resetting the nut bodies, in some cases, it is advisable to tilt the die head.

No. 1406602

The machine operates as follows (for clarity, the nut is conventionally depicted as a rectangular plate).

The blank from the loading device (fig. 2, a) 24 of the nut is located on the pin x 19 and rests against the abutment 25. At the same time the blank (fig. 2, b) is freely positioned between the two limiters 26. The rotation 1 is constant with a constant speed. and the conical part of it "bites the workpiece along the hole (Fig. 2, c), the pins 19 are lowered by the amount and the workpiece is released from the engagement with the stop 25 and allows it to set itself within the angle a (Fig. 2, b) .

Threading (Fig. 2, d) occurs when the tap is forced to feed. The pins 19 are at the same time stationary, but due to spring loading they can be compensated for by a slight mixing of the workpiece due to some discrepancy between the pitched size and the tap step. When entering Kalnbruyush: her part of the tap into the workpiece is accelerated by taping the value of a tap with the pin 19 removed downwards (Fig. 2, e).

Going out of engagement with the stops 26, the nut gets the opportunity to rotate with the tap. The pins are spring-loaded in the axial direction and rotate in the same direction, but with increased speed. Going down on the tack, these pins grip the nut and screw it off from the taps during its upward retraction (Fig. 2, e), and all parts return to their original position (Fig. 2, g).

Subject invention

Claims (2)

1.Automatic shnindelnaya threading head with a cam feed, and screwing the nut from the tap after cutting due to accelerated rotation of the nut, characterized in that, in order to ensure the screwing of the nut without an additional spindle, the head is equipped with a drive axially movable lead concentric with thread cutting spindle. 2. The head according to claim 1, wherein, in order to keep the nut being cut from turning during the cutting process, the head is provided with a non-rotating axially movable axially with a spindle. Fig. / Rig.2