SU86720A1 - Device for clamping material on turret lathes and automatic machines - Google Patents

Description

A device is proposed that is used in turning-turret lathes and automatic machines and is used for clamping rod material in a cartridge through a hollow spindle.

Devices of the same designation comprising a clamping sleeve cooperating in axial displacement via intermediate rollers with a draw tube passing inside a hollow spindle and controlling a collet, lever or wedge cartridge, are known.

The stroke of the clamping sleeve and the stroke of the draw tube in such devices are of constant magnitude. Therefore, after reaching the required clamping of the machined rod, the contact between the clamping sleeve and the intermediate rollers is transferred from the conical surface to the cylindrical surface and the device closes. When the bar diameter is smaller than the one on which the device is adjusted, the contact between the clamping sleeve and the intermediate rollers will change from a conical surface to a cylindrical one before the bar is clamped. With a bar of a larger diameter, there will be excessive deformation of parts of the device, and sometimes its destruction.

In the described device, this disadvantage is eliminated. In it, the clamping clutch also has a constant stroke length, but the clamping of the bar, depending on the size of the deviations of its diameter, occurs at different sites along the clutch stroke. This provides the ability to clamp uncalibrated bars, with the clamping force remaining constant and independent of the diameter of the clamped material.

FIG. 1 shows a longitudinal section of the device; in fig. 2 is a section taken along line AA in FIG. one; in fig. 3 is a section along the BB line in FIG. one; in fig. 4-sweep cams.

On the hollow shpinddel 1 movably along its axis mounted thrust sleeve 2, on which is located the clamping clutch 3, first part number 86720

ma along its axis for a constant value of the cam movement of the automaton. L1ufta 3, when it moves forward, interacts with the Oochorazny rollers 4. The rollers, in turn, interact on one side with the conical end of the thrust sleeve 2, and on the other through the sleeve 5, which is attracted by springs b to the sleeve 2} and the other shayoi 7 and cracker 8, with tightening tube 9 located inside spindle 1.

The rear end of the spindle is fitted with an overrunning clutch comprising a casing W rigidly fixed on the spindle with a cam washer 11 and two concentric bushings 12 and 13, which interact with screw loops at their ends with a washer 11 and loaded with tangential springs 14 and 15, which tend to inform the bushings angular and axial displacement relative to the washer 11. In the sockets of the sleeve 12 are located the rollers 16, which are loaded with springs 17 and are used to jam the sleeve 13 in the casing 10.

When the clamping clutch 3 is moved forward (according to the drawing to the right), until the clamping jaws of the cathron meet the material of the sleeve 12 and 13, the action of the springs 14 and 15 rotates around their axes and also moves to the right under the action of the screw knuckles; at the same time, the sleeves 2 and 5, the rollers 4, the clamp 7, the cracker 8, and the pulling tube 9 move to the right. In this case, a gap is taken between the clamping jaws and the iron and the material. After meeting the jaws with the material, the sleeve 5 stops, and the clamping sleeve 3 with its further movement causes the sleeves 2 and 13 to move to the left, compressing the springs 6, and the sleeve 13 simultaneously rotates about its axis and squeezes the springs 15. As a result, the rollers 16, the sleeve 13 is wedged in the casing 10 and its further movement along the axis of the spindle becomes impossible.

Upon further movement of the clamping clutch 3, the material is clamped and the contact between the clutch 3 and the rollers 4 is transferred to a cylindrical surface, the entire device is closed.

The amount of clamping force of the material is adjusted by nuts 18 and 19, the position of which determines the angle of rotation of the sleeve 13 until it is jammed by the rollers 16 and the succession, and the stroke of the stop sleeve 2 to the left until it stops and the position of the rollers 4 is identical to the profile of the clamping sleeve from which begins to tighten the material.

The clamping force at a certain position of the nuts 18 and 19 is constant and does not depend on the diameter of the clamped material.

When moving the clamped sleeve 13 to the left, the material is released from the clamping first, then iodine acts on the right end of the coupling 3, the sleeve 12 moves to the left and simultaneously rotates around the spindle axis, compressing the spring 14, resulting in rollers 16 splitting the sleeve 13 and all parts of the device move to the outermost left starting position.

Subject invention

Claims (2)

1. A device for clamping material on lathe turret machines and automatic machines using a roller clamping coupling, a pulling tube extending inside the spindle, and a collet, lever or wedge cartridge (for bar material or piece blanks), characterized in that clamping with a constant force of uncalibrated material by means of a constant axial movement of the outer sleeve of the clamping coupling of various movements of the pulling pipe, in accordance with deviations of the diameter of the clamped material It is equipped with a mechanism for the axial movement and fixation of the stop sleeve of the clamping coupling. 2. The form of the device according to claim 1, characterized in that the axial movement and fixation mechanism of the stop sleeve is made in the form of a roller overtaking clutch consisting of a casing mounted on a rod and two concentrically arranged sleeves receiving angular and axial movement under the action of tangential springs and face cams of the casing and interacting with their ends with the outer and thrust hubs of the clamping coupling. shchu / sh A L