SU584976A1 - Semi-automatic thread-cutting lathe rest - Google Patents

Description

The invention relates to the field of machine-tool construction, in particular to support for thread-turning semi-automatic machines with a reversible spindle, designed to cut external threads in series from both sides in both directions of travel.

The known support for a threaded semi-automatic screwdriver with a longitudinal feed screw includes a cutter feed mechanism with two face stepped copiers mounted on two shafts, a two-sided probe that interacts in a neutral position with a spring-loaded lock, a tool holder with two additional cutter holders rotating in a plane, perpendicular to a longitudinal feed, with the tool holder being driven by a hydraulic cylinder and connected to the probe lever system 1.

The aim of the invention is to improve the quality of processing and reliability of the machine in operation.

This is achieved by the fact that the double-sided probe is made in the form of screw jacks with right and left threads, interacting on one side with the stop nuts in the probe body and on the other side with a two-way rack-and-pinion nut. Part

jacks located between the threaded sections are cylindrical with mounted on it with the possibility of moving along the axis of worm wheels, the screws of which are equipped with gears mounted with the possibility of moving along the axes and interconnected through the parasitic gear wheel with the possibility of disengaging from it .

The drawing shows the kinematic scheme of the proposed., Support for threaded semi-automatic.

In the guides 1 of the frame of the threaded semi-automatic machine, the caliper body 2 is mounted, on which the tool holder 3 is installed, pivoting in a plane perpendicular to the longitudinal feed of the caliper, and equipped with two two rotating in the same plane holders 4 and 5 with cutters 6 and 7.

The toolholder is driven by a hydraulic cylinder 8 with two springs and is connected through a pull 9 and a lever 10 with a feed mechanism consisting of a slider 11, an adjustable probe 12, two shafts 13 and 14 with face stepped copiers 15 and 16, a double ratchet mechanism 17 and hydraulic cylinders 18.

Claims (1)

Adjustable probe 12 (its body) is fixed on the slider 11 and contains two screw jacks 19 and 20 with right and left threads. two worm gears 21 and 22, a gear drive consisting of two gears 23 and 24 interconnected by parasitic gear 25, a pinion gear 26 with a double-sided nut drive 27 with a right and left thread and a locking screw nut 28. Each of the jacks has two threaded a section of equal pitch and direction, one of which is placed in a thrust nut 29 (30) fixedly mounted in the probe body, and the other in a swiveling two-sided nut drive gear 27. Between the threaded sections there is a cylindrical section on which Connections movably along the axis are mounted worm gears of gears 21 and 22. On the worm shafts 31 and 32 of the said gears are installed with help and keyed connection movably along the axis of gear wheel 23 and 24. In the probe body there is a slot interacting with the latch 33. On the shafts 13 and 14, the control drums 34 and 35 are installed, the shaft 14 being hollow, and the shaft 13 being placed inside it. On the drums 34 and 35, stops 36 and 37 are installed, which cooperate with the corresponding end switches 38 and 39. The device operates as follows. In the drawing, the caliper is shown in its original position. In this case, the cutters 6 and 7 do not touch the machined part, the latch 33 fixes the probe 12 in the neutral position, the end switches are pressed. During the working stroke of the caliper, with pressure being applied to one of the cavities of the hydraulic cylinder 8, the tool holder 3 is rotated and one of the cutters, for example 7, crashes into the machined part, which at the same time rotates counter-clockwise. At the same time, the tool holder, through the rod 9 and the lever 10, moves the probe 12 up to the stop of the jack 20 to the corresponding stage of the cam 16, which determines the depth of penetration of the tool. At the completion of the first working stroke of the caliper, the pressure with the hydraulic cylinder 8 is released and the springs return the tool holder and the probe to the neutral position. At the same time, the rotation of the product and the direction of travel of the caliper are reversed. When pressure is applied to the other cavity of the hydraulic cylinder 8, the cutter 6 comes into operation, and the jack 19 goes to the corresponding stage of the copier 15. Then the hydraulic cylinder 18 drives the ratchet mechanism 17, one half of which turns the copier 16 to the next stage, and the other is prepared to rotate the copier 15. The cutting cycle is repeated. During the first rotation of each of the copiers, end switches 38 and 39 are released, which remain free during the entire processing of the product. Upon completion of the complete rotation of each of the copiers, the end switches are pressed and the processing of the product ends. Control of the initial position of both copiers after processing the previous product prevents breakage of the incisors and the defect during processing of the subsequent product. If you need to adjust the depth of the initial incision of the cutters 6 and 7, the outreach of the jacks 19 and 20 of the stop nuts 29 and 30 is changed. To do this, the rail 26 and the gear nut 27 move the lock nut 28. By turning the gear nut, the threaded sections jacks 19) 20 interconnected with it. Then, by turning one of the shafts 31, 32, the worm gears 21, 22 are driven. The jacks 19, 20 rotate simultaneously in the nuts 29, 30 and the gear nut 27, changing their reach from the hoop body 12. At the completion of the adjustment process, the nut 28 is turned into opposite the original direction and driven through the rail 26 to the nut-propeller 27, which attracts the jacks to each other, with the result that gaps in the nuts 29 and 30 are selected and the position of the jacks is securely fixed. If necessary, the departure of only one jack can be changed. For this, gears 23 and 24 are disengaged from gear 25. As the overhang of the jacks changes, the distance to the stages of the copiers 15, 16 and, accordingly, the toolholder stroke changes. In the event of a change in the jack outliers, it becomes necessary to adjust the cutting angles. For this, the holders 4 and 5 are pivoted in the tool holder 3. A threaded semi-automatic caliper made in this way ensures a stable cutter installation on each pass, which helps stabilize the thread shaping process and the quality of the machined surface, and removing the additional control drum improves the reliability of the threaded semi-automatic tapping machine. Claims for a threaded semi-automatic screwdriver with a longitudinal screw drive with a cutter feed mechanism with two face stepped copiers mounted on two shafts, a two-sided probe that interacts in neutral position with a spring-loaded lock, a tool holder with two additional tool holders, rotatable in the plane, a perpendicular longitudinal feed, the toolholder being driven by a hydraulic cylinder and connected to a lever gauge, characterized in that o, in order to improve the quality of processing, the double-sided probe is made in the form of two screw jacks with right and left threads, interacting on one side with stop nuts in the probe body and on the other side with a double-side gear nut, driven by a rack and pinion gear, and part of the jacks located between the threaded sections, is made cylindrical with mounted on it with the possibility of moving along the axis of the worm wheels, the screws of which are equipped with gears, installed 5584976g with the possibility of movement along the sources of information, taken into attention and interconnected through the parasitic during examination: gear with the possibility of withdrawal from the grip-1. USSR Copyright Certificate № 410891, nor with her.kl B 23 G 1/00, 1969. 0: t