SU584990A1 - Attachment to engine lathe for cutting variable-pitch thread - Google Patents

Description

(54) DEVICE FOR TURNING AND CRUSHING MACHINE FOR THREAD CUTTING WITH A VARIABLE STEP

The invention relates to metal cutting and is intended for use in various fields of the engineering industry. It can be used, for example, in chemical and food engineering for processing augers of mixing machines.

A device for turning a screw-cutting machine for threading variable pitch, in which the spindle is kinematically connected with the lead screw by means of a guitar of replaceable wheels and a gear mechanism.

In order to expand the technological capabilities in the proposed device, the gear mechanism is made in the form of two blocks of interchangeable gears, a master and a slave, connected to the lead screw through the hydraulic booster and is equipped with an exhaust key associated with the device for its step motion. The device is equipped with a pointer-ruler with a set of cams fixedly mounted on the machine bed, and the caliper is equipped with limit switches included in the control circuit of the stepping movement device.

On the gears of the driven unit of the gear mechanism, key grooves are provided in an amount equal to the number of penetration paths.

This device can also be used for threading variable pitch with continuous and uniform variation, for which the interchangeable gears of the blocks are installed in series with a slight decrease or increase in the number of teeth of these wheels, i.e., Norton cone type, widely used. in the feed boxes of screw-cutting machines.

The drawing shows a kinematic diagram of a device for a screw-cutting lathe for cutting threads with variable pitch.

The device consists of a block of 1 interchangeable gears, loosely seated on the shaft 2, which is connected by coupling 3 to

the input shaft of the hydraulic amplifier 4. In the slot of the shaft 2 there is a rotary key 5, one end of which fits into the corresponding splined groove of one of the gear wheels of the block 1 and is pressed by the circle 6, and the other is in the device 7, which is used to step the key 5 shaft groove 2.

Claims (2)

In the case of cutting multiple threads in the gears of block 1, the number of key slots equal to the number of threads entered is provided. This device may be of electropnection or hydro-mechanical type. The interchangeable gears of the block engage with the corresponding gears of the block 8 rigidly mounted on the shaft 9 and connected by the guitar 10 interchangeable gears to the gearbox 11. The input shaft of the hydraulic booster 4 is connected to the lead screw 13 by means of the coupling 12, which is connected with the rotor nut 14 caliper 15, carrying, for example, a milling head with a cutting tool 16. On the base of the machine fixed line-pointer 17 with located on her cams 18 and 19, interacting with switching devices 20 and 21 for example. limit switches mounted on the caliper 15. The workpiece 22 is secured by a clamping device 23, for example a three-cam self-centering chuck mounted on a speed center pin 24 11. The described device works in the following way. The rotation from the shpindles 24 is transmitted by the intermediate gears of the gearbox 11 to the guitar 10 exchangeable gears and then to the shaft 9 with a block of 8 changeable gears rigidly attached to a new unit. In turn, these wheels impart rotational movement to the respective interchangeable gear wheels of the block 1, which are loosely seated on the shaft 2 between the rings 25. In the case when the tapered end of the extractor 5 is in the groove of one of the wheels of the block 1, the shaft 2 rotates by means of clutch 3 transmits movement to hydraulic booster 4 and clutch 12 to the spindle 13. The mother nut 14, engaging with the screw, converts the rotary motion of the spindle into the translational movement of the caliper 15 with fixed on it astringent tool. Thus, cutting the first portion of the workpiece 22 with a certain step is performed. As the caliper 15 moves, the switching device 20, such as a limit switch, abutting one of the cams 18 installed at predetermined predetermined positions on the ruler 17, gives the command a device that moves the exhaust pin 5 to one rod. Due to this, the next pair of interchangeable gears of blocks 8 and I is put into operation and the size of the thread pitch on the product 22 changes. As the caliper continuously moves from the initial position to the final, determined by the length of the workpiece, when Cams 18, 19 and blocks 8 and 1 of the interchangeable gears, a step change is made on the cut stitch on the product 22. Switching the exhaust tong 5 on the move is performed by a hydraulic amplifier 4 connected by couplings 3 and 12 to the shaft 60 5 J5 2 and the driving screw 13 and transmitting to the last great torques. When cutting threads in opposite parts of an article in the opposite direction, the spindle changes from its direction of rotation. This is achieved by the action of one of the cams 19 installed on the indicator-ruler 17, on the switching device 21, for example, a limit switch, which gives a command to drive the gear box (not shown), thereby changing the direction of rotation of the workpiece 22 and, therefore, the direction of the thread being cut. Thus, by installing the cams 9, a change is made in the direction of the thread being cut in any sequence and any place along the length of the workpiece. When cutting multiple threads, the sequence of work described above is maintained; however, after cutting the thread of the first run, the machine stops and then the pull pin 5 is manually placed under one of the rings 25, disengaged from the wheels of the interchangeable gear unit 1. After that, the workpiece 22, together with the pushpin 24, is rotated until the exhaust pin is inserted into the groove of the extreme gear wheel of the block 1, made, for example, under 180 ° with two-way thread, 120 ° with three-way, etc. The position corresponds to the start of the second run. Further, the cycle of operation of the device is repeated. Claim 1. Device for turning screw-cutting machine for cutting threads with a variable clamp, in which the spindle by means of a guitar of replaceable wheels and a gear mechanism is kinematically connected with a lead screw, characterized in that, in order to extend technological capabilities, a gear mechanism in it made in the form of two blocks of interchangeable gears, one leading and one driven, connected to the lead screw through the hydraulic booster, and provided with an exhaust pin connected with the device for its schagovy movement, and the device is equipped with a pointer-line with a set of cams fixedly mounted on the bed of the machine, and the caliper is set by the limit switches, that are included in the control circuit of the device to the thrust movement. 2. The device according to claim 1, characterized in that on the gears of the driven unit of the gear mechanism, keyways are made in an amount equal to the number of thread starts. Sources of information taken into account in the examination: 1. Author's testimony. No. 212708, cl. In 23 G 3/10, 1968.