SU1340922A1 - Arrangement for clamping workpieces to a lathe - Google Patents

Abstract

The invention relates to devices for clamping parts on lathes. The aim of the invention is to increase productivity by reducing the time to fix the part. The device contains a cam cartridge and a mechanized key. In order to reduce the fixing time of the part, key centering mechanisms and a key holding mechanism in a suspended state are introduced into the device. The first is made in the form of a pneumatic cylinder, the stem of which is equipped with a lock. On the periphery of the cartridge are nests. The second one is made in the form of a bracket fixed on the key and interacting with spring-loaded stops fixed on the spindle head. Due to this mechanism, the key is held in a weighted connection, then, with respect to the circular guides, which allows turning the cartridge to bring its socket closer to the latch action zone. Then, using a pneumatic cylinder, a retainer is inserted into the socket, which ensures the insertion of a rod and a key coupling half into the coupling half of the cam movement actuator. Next, the key rotates and the part is clamped or unclamped. 7 il. I (/

Description

The invention relates to a machine tool industry, in particular to devices for clamping parts on lathes.

The aim of the invention is to increase productivity by reducing the time to fix the part.

FIG. 1 shows the device, a general view; in fig. 2 shows section A-A in FIG. one; in fig. 3 is a view B in FIG. one; in fig. 4 shows section B-B in FIG. one; Fig. 5 shows the node I in Fig. 1; in fig. 6 - section G-Y in FIG. four; in fig. - node II in FIG. 4. The device contains a cam cartridge 1 (Fig. 1) and a mechanized key 2 mounted on the housing 3. The housing 3 is fixed on the U-shaped bracket 4, which is able to swing on the circular guide 5 by means of rollers 6 fixed in the walls of the П- shaped bracket 4. The circular guide 5 consists of two sectors I and K (Fig. 2), fastened together by spacers 7, and mounted on a plate 8 rigidly fixed to the spindle head 9. The guide 5 has stops 10 (along one on each side) for preventive tim decay emergency key 2 with the guide 5.

The device is equipped with a mechanized key centering mechanism, which is made in the form of a pneumatic cylinder 11 (Fig. 4), the stem 12 of which is equipped with a conical lock L (Fig, 5) that interacts with conical sockets M made on the periphery of the body of the cartridge 1 along a cylindrical generatrix. The surfaces of the conical clamp L and the conical socket M have equal tapers. The number of sockets M is equal to the number of cams in the cartridge 1.

A pointer 13 is inserted into the device (Fig. 1) of the position of the cartridge 1 with the workpiece, which is fixed by the U-shaped bracket 4. On the outer surface of the cartridge 1 there are 3 risks (Fig. 3) H, P and P, equidistant from the cam sockets 1, including the zone of action M of the conical shank L. The slope of the conical clamp L must be

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D-d J.

The device is equipped with a mechanical key holding mechanism in a suspended state, made in the form of a bracket 14 (Fig. 6) mounted on the body 3 of a mechanized key 2. The bracket 14 cooperates with spring-loaded springs 15 stops 16 placed in. housings 17 mounted on headstock 9.

To automate the closure of the teeth of the half-coupling 18 of the mechanized key 2 and the teeth of the half-coupling 19 of the screw 20 of the chuck of the chuck 1 (Fig. 7), an pneumatic cylinder 21 is provided (fig. 4). The rod 22 of the pneumatic cylinder 21 is connected to the spindle 23 of the mechanized key 2. With the possibility of rotating the spindle (not shown). On the spindle 23 of the motorized key 2, a working head, including, is mounted by a spline connection. housing 24 spring loaded 25 in the direction of travel.

The key 26 is kept from falling out of the housing 24 from the splines. The torque from the spindle 23 is transmitted through a pinching connection to the housing 24, from which the screws 28 are provided through the pins 27 to the coupling half 18. From the housing coupling half depressing from the housing 24, screws 28 are provided.

The coupling half 19 of the screw 20 is centered with a bracket 29, which is mounted on the chuck 1. The working head is equipped with a centering rod C, which provides precise grip. gear couplings 18 and 19 when interacting with the centering 1 m hole T in the screw 20 of the chuck of the cartridge 1.

The workpiece clamp control is automatic and carried out from the control panel. Push button on the remote stop cartridge 1 in polo

when the 13 position indicator

cartridge 1 with detail is in the zone G of the action of the conical clamp L, at the maximum approaching the combination of the indicator 13 with the risky P.

After centering (aligning) the part in the cartridge 1, the toggle switch is located on the guide 5 in the weighted state by means of spring-loaded stops 16 and the bracket 14 can be rotated (Fig. 6) in both directions.

From the control panel, the compressed air is admitted to the rodless cavity of the pneumatic cylinder 11, the mechanized key 2 and the cartridge are fixed

1 by means of a conical retainer L and a conical socket M. In this case, the axis of the rod coincides

C (Fig. 7) of the working head and the hole T of the screw 20. In the case where the pointer 13, being in the zone of action Ж of the conical clamp L, was not aligned with the risk R, during fixation, the springs 15 are compressed by the stops 16 and the mechanized rotation key

2. on rollers 6 from the action latch L.

After installing the workpiece, the toggle 1 switches the toggle switch on the control panel to the Centering position J, turns on the motor of rotation of the spindle 23 of the mechanized key 2 and simultaneously compresses the compressed air into the rodless cavity of the pneumatic cylinder 21, making a radial movement with the rotation of the coupling 18.

When clamping a part in a 4-jaw chuck, it must first be centered (aligned) with a small torque MK; on the spindle 23, after which the part must be clamped in the chuck finally with the torque on the spindle 23 equal to MK / J. MXk 0.3-0.5 M ((j ,. For this, in the part clamp control circuit in cartridge 1, two overcurrent relays (not shown) are provided, which are switched on by a toggle switch selectively from a control panel (not shown) and turn off the motor the key when the torque on the spindle reaches 23 mp or,.

Centering rod C of the working head enters the hole T of the screw 20, the teeth of the coupling halves 18 and 19 are closed and the part is pre-clamped in the cartridge 1 with the Mitf torque,. .

When the ends of the teeth of the half coupling 18 are pressed into the ends of the teeth of the half coupling 19, the spring 25 is compressed by the spindle 23 by means of the rod 22 of the pneumatic cylinder 21. The ends of the teeth of the half coupling 18 slip through the ends of the teeth of the half coupling 19, but under the action of the spring 25 and the rotation of the half coupling 18,

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the teeth close and clamp the parts in the chuck with torque,.

After centering (aligning) the parts in the cartridge I, the toggle switch on the control panel is switched to the Final Clamp position.

The final clamping of the part in the chuck is performed in the same sequence as the preliminary clamping - centering.

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The final clamping of the part in the chuck is made when the torque on the spindle reaches 3-M | f. When this moment is reached, the motor of the key 2 is switched off.

Compressed air is supplied to the rod end of the pneumatic cylinders 11 and 21. The half coupling 18 and the conical retainer L are returned to their original position.

Cams of the cartridge 1 can be clamped selectively, for example through 180 or sequentially.

Claims (1)

Invention Formula A device for clamping parts to a lathe, comprising a cam cartridge and a mechanized key mounted on a housing mounted for rotation on a circular guide mounted on the spindle head of the machine centering the axis of the cartridge, in order to increase productivity by time for fixing the part, it is equipped with a key centering mechanism and a mechanism for keeping it in a suspended state, while the centering mechanism is designed as a pneumatic cylinder with a piece com equipped with a conical latch designed to interact with sockets made on the periphery of the cartridge case, and the key holding mechanism in a suspended state is made in the form of a bracket rigidly fixed on the key case and designed to interact with the device in the device with two spring-loaded stops, i mounted on the spindle stock of the machine. 7 Aa FIG. 2 Type B Fig.Z 21 go r g / 7 6 Editor N.Shvyschka Compiled by A. Gavryushin Tehred M. Didyk 4385/17 Circulation 974 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 Fi.7 Proofreader E.Roshko