SU933374A1 - Apparatus for changing working heads - Google Patents

Description

(5) DEVICE FOR CHANGING WORKING HEADS

one

The invention relates to machine tooling, namely, devices for automatic tool changing on milling and boring machines.

A device for changing working heads on milling and boring machines is known, which comprises a table for accommodating working heads and a mechanism for fastening them to the slider face. The fastening mechanism has rotating rolling pins, passing through the holes of the table, with the possibility of coupling with the clamping screws 1 embedded in the bodies of the working heads.

A disadvantage of the known construction is that the axial force of movement of the head clamp mechanism is fully transmitted to the thread of the clamping screws, which significantly reduces the device’s performance and durability, as well as the fact that the clamping mechanism does not control the mounting process of the working heads, so that it is impossible to automate fastening heads on the end of the slide.

The purpose of the present invention is to improve the performance, reliability and durability of the device.

To achieve this goal, the working heads are equipped with a follower mechanism and thrust bearings located in their housings, and the clamping screws are made of two parts interconnected through an additionally inserted splined hub. The lower parts of the clamping screws are installed in thrust bearings, and their upper threaded parts are provided with stop collars and are spring-loaded.

In addition, the tracking mechanism is designed as a control sensor and two rods, one of them being integrated into the lower part of the clamping screw with the possibility of constant contact with the upper part. The second rod is mounted in a rolling pin with the possibility of contact

with the first rod and interaction with the sensor control.

FIG. 1 shows a general view of a device for changing slave heads; in fig. 2 - section A-A of FIG. one; in fig. 3 section bb FIG. one.

Table 1, rotatable around axis II, bears rotatable around its axis AND-AND spring-loaded nests 2, on which face working heads 3 are installed. The table is mounted on a rotary, around the axis GI-I1 lever k and fixed to the machine base by means of bracket 5 6. From below (Kronshteyn has a mechanism for fastening the heads to the end of the slider 7 of the milling and boring headstock, which is a plate 8 on which four driving devices 9 of the rotating rolling pins are installed 10. Rolling pins can receive translational movement along its axis t hydraulic cylinders 11. In the lower position they are removed from the holes 12 of the table 1 and the holes 13 of the socket 2 and make it possible to rotate the table 1 around the axis I-1. to change the working heads. In the upper position of the rolling pin they engage with the clamping screws and can produce a clamp or spin working head to the end of the slide 7.

The clamping screw of the working head consists of two parts. The lower part 14 is fixed axially in the housing of the working head 15 by means of thrust bearings 16. The upper part of the screw 17, having a threaded end 18 and thrust collar 19, receives rotation from the screw 10 of the fastening mechanism of the working heads by means of the lower part of the screw 1 through a slotted sleeve

20. The fastening of the working head with the slider 7 is done with the help of a nut.

21 fixedly connected to the slider 7. Inside the lower part of the clamping screw there is a rod 22, which is constantly pressed by means of a spring 23

to the top of the clamping screw 17 and follows it over the length of the screwing during the clamping and spinning process.

The rolling pin is rotated by known rotational drive drives, for example, an electromechanical clamping head-2k, having control of the magnitude of the torque and automatically switching off when the adjusted value of this moment is reached. From below, the rolling pin 10 has a slotted shank, due to which it is driven into rotation from the clamping head 2k through the gearbox 25 and can be moved along its axis by means of a pull 2b rigidly connected to the hydraulic cylinder rod 11. From above the rolling pin has a rectangular tooth 27, which it in its upper position, it engages with the end teeth 28 of the clamping screw of the working heads I and causes the latter to rotate. The axial force of movement of the hydraulic cylinder rod is transmitted to the rolling pin through the spring 29 and when engaged with the clamping screw of the working head 14 is perceived by the thrust bearing 16. The upper part of the clamping screw 17 does not carry the axial load from the screw and the screw end 18 is loaded only by the force of the spring 23.

Inside the rolling pin, the rod 30I is spring-loaded upwards with a spring 31. In the upper position of the rolling pin, the rod 30 interacts with the rod 22 located in the clamping screw of the working head, following the movement of the upper part of the clamping screw 17 of the working head during the clamping and spinning process. The movement of the rod 30 through the pin 32, passing through the grooves in the rolling pin, is transmitted to the sleeve 33 and the outer sleeve 3 associated with it, kept from rotation by the bar 35. The sleeve 3k is a stop moving along the axis of the rolling pin 30 and acting on control sensor 36 controlling the automatic cycle of clamping and spinning. The sensor control 36 is mounted on a bracket 37 associated with a step 26.

Claims (2)

The device works as follows. To fix the working head 3, which is installed in the slot 2 in the position necessary for operation on the table 1 of the device, the slider 7 of the milling boring headstock is brought to the device so that the axis of the spindle of the slider is aligned with the axis II-II of the working head. Then the slider is moved down to the docking with the working head 3. To compensate for the inaccuracy of the axial movement of the 11 slider when docking, the spring-loaded nest 2 sags. By means of the hydraulic cylinder 11, the rolling pins 10 are moved to their upper position, in which they engage with the clamping screws Ik of the working head. Further, the rotation of the rolling pin drive in the clamping direction is activated. At the beginning of the clamping and at a certain length of screwing the threaded end 18 of the upper part of the clamping screw 17 with the nut of the slider 21, the monitoring sensor 36 is in the pressed position, so that the rotational drive of the rollers 10 can turn the clamping screws until it stops automatically. a predetermined torque of the clamping of the working head to the slide, and after passing. With the clamping screw of the specified screwing-in length, the control sensor 36 moves to the down position. At the end of the process of clamping the rolling pin, the rolling pin is lowered to its lower position, the headstock with the working head clamped on the slider is moved to work in the working area of the machine. In the event of a malfunction of the thread of one of the clamping screws of the head, screwing does not occur. The clamping screw rotates, but does not have axial movement, therefore the control probe BZ remains in the depressed position, and after a certain period of time from the start of the start of the clamping process, the drive of the sparse rotation automatically stops and a fault signal is sent to the device control pool. To secure the working head, the headstock with the working head fixed to the slider is moved to the device in such a way as to set the working head in the nest 2. Then the rolling pins 10 are brought to their upper position and the drive of the pins rotates in the clamping direction. During the spinning process, after unscrewing the clamping screw 17 from the nut 21 for a predetermined length of movement, the monitoring sensor 36 is pressed, and after a certain period of time, the rotational drive of the rolling pin is automatically turned off, the rolling pin is lowered to its lower position. After the end of the pressing process, the working head remains in the nest 2 of the device, the headstock is moved to the working area of the machine for working with a vertical spindle (without a head). If it is necessary for the workhead to work with the head in another position relative to the slider face, the latter, after pressing the working head, rises, undocking from the head. The slot 2, together with the working head, is rotated to the required position for operation, and then the cycle is repeated. The application of the present invention will improve the performance and reliability of the device. 1. Device for changing working heads on milling and pacTOMHbix machines, comprising a table for placing working heads and a mechanism for attaching working heads to the slider face, having rotating rolling pins passing through table openings with the possibility of coupling with built-in clamping screws in working bodies of working heads , characterized in that, in order to improve the performance and durability of the device, the working heads are equipped with a follow-up mechanism and thrust bearings located in their housings, and the clamping screws s are made of two parts interconnected through an additionally inserted splined hub, the lower parts of the clamping screws are installed in thrust bearings, and their upper threaded parts are provided with stop collars and are spring-loaded. 2. The device according to claim 1, characterized in that the follow-up mechanism is made in the form of a control sensor and two rods, one of which is embedded in the lower part of the clamping screw with the possibility of constant contact with the upper part of the clamping screw, and the second rod is mounted in a rolling pin with the possibility of contact with the first rod and interaction with the sensor control. Sources of information taken into account in the examination 1. USSR Author's Certificate Vt 613878, cl. B 23 O 3/155, 1976. 1 Aa