SU975268A1 - Spindle assembly of machine for working stepped buttress threads - Google Patents

Description

(54) SPINDLE ASSEMBLY MACHINE FOR PROCESSING STEP-UP THREADED THREADS

one

 The invention relates to a machine tool industry, and more specifically to spindle assemblies of machines for machining stepped resistant threads, when it is necessary to cut threads of the same pitch into steps of different diameters.

The spindle unit of the machine for processing Step stop threads is known, which contains a connecting input shaft and spindle kinematic chain in which is included; e1 differential with carrier and satellites, mechanism for controlling the spindle spin cycle with stops through a given angle and gear transmission setting the spindle angle with two-gear gear mounted on the pre-spindle shaft I.

A disadvantage of the known spindle assembly is that the mechanism for controlling the rotation cycle of the spindle is made in the form of a cam mechanism, which works with shocks and high contact loads and which complicates the design and does not provide sufficient reliability and durability. ,

The aim of the invention is to simplify the design and increase reliability and durability.

To achieve this goal, the spindle rotation control mechanism is made in the form of a rotary drum with a closed spiral coil, which interacts with a longitudinally movable gear rack in engagement with one crown of a two-turn GNR-stern, the second crown of which is coupled with satellites differential, driven by, 0 kinematically connected with a swivel drum. At the same time, the kinematic connection between the carrier and the rotary drum is made in the form of a worm gear, the worm gear is mounted on the same axis with the rotary drum, and the worm gear is connected to the distributing shaft connected to the input shaft with the gear wheel, coupled with a crown made on the carrier.

FIG. 1 shows a kinematic scheme of a machine for machining stepped stop threads; in fig. 2 is a scan of the spiral turn of the rotary drum with a spindle rotation diagram.

Claims (1)

From the drive motor 1 through the pulley 2, the belt drive 3, the starting electromagnet-. The coupling sleeve 4 and the pulley 5 are transmitted to the input shaft 6 of the spindle assembly which is paired with 11) winds 7 and 8 is connected to the dispensing palan 9. The luecTcpiiH 10 is fixed to the shaft 9 and the worm is to 11. The gear 10 is in engagement with the gear teeth made on the differential shaft 12, and the screw to the screw wheel 13 mounted on the shaft 14 together with the drum 15 having a closed spiral coil 16, which interacts through two rollers 17 with the shaft 18 axially in place with the bar 18. The rail 18 is in engagement with the crown of 19 two-pinion gear, the second the crown 20 of which is coupled with satellites 21 differentials. The satellites 22 are coupled with a gear wheel 23 mounted on a pre-spindle shaft 24. On the same shaft, a two-crown block 25 is mounted, which is engaged with a block 26 fixed on the schndeldel 27. The change of engagement of the crowns of these blocks is carried out -. The change in the magnitude of the angle ци of rotation of the chisel (in practice, H 30 ° or 60 °). A workpiece 29 is mounted in a clamping device 28 mounted on the spindle 27. The spindle is connected kinematically with the spindle 33 by the gear wheels 30 and the interchangeable gears 31 and 32 to the driving screw 33, which, when interacting with the nut 34, moves the carriage 35, on which the cross slide 36 is mounted, bearing tool holder 37 with a cutter. The cross slide is equipped with an individual controllable drive, which consists of an electric motor 38, a pair of gears 39 and 40 n of the lead screw 41. A closed spiral coil 16 of the drum 15 (Fig. 2) consists of four sections: section a spindle and (spsp. 0); spindle acceleration section b; a section with a uniform rotation of an ashline with a given speed when machining one stage of a piece; and section d of the braking spindle. The proposed spy node works as follows. In the clamping device 28 in a strictly oriented angular position, the workpiece 29 is set and, via the starting electromagnetic clutch 4, from the engine I, through a belt drive, rotation is communicated to the input shaft 6 and, via a pair of gears 7 and 8, to the dispensing shaft 9, which divides the movement into two flow. The first flow: through the neck 10, the rotation is transmitted to the carrier 12 of the differential, while the satellites 21 and 22 roll around the crown 20. The second flow: through the worm to the 11 and the worm wheel. 13 the rotation is connected to the drum 15, the closed spiral coil 16 of which interacts with the rollers 17, reciprocates the rail 18 according to the law determined by the nature of the curvature of the spiral turn 16. When the rollers 17 pass through the section from the spiral turn, the rail 18 rotates the rims 19 and 20 of the two-pinion gear in the direction coinciding with m of rotation of the gear wheel 23, as a result of which uniform rotation from the distributing shaft 9 is transmitted in two streams to the shaft 24 and the block 25 sitting on it, and from it through the block 26 to the spindle 27 with the latching device 28 and the product 29. By means of gears 30 and the interchangeable gears 31 and 32, the rotation coordinated with the spindle is transmitted to the drive screw 33, which, through the nut 34, communicates the translational movement of the carriage 35, which results in processing the thread of the thread that is located on one stage of the workpiece 29. As and the drum 15. the rollers 17 are transferred to the area d of the spiral turn 16 when the rims 19 and 20 rotate in an alternating direction relative to the rotation of the gear wheel 23, thus achieving the braking of the spindle 27. When the rollers 17 go to the section a of the spiral coil 16, the direction of rotation of the rims 19 and 20 is opposite to the indicated one, at this time the gear wheel 23 does not rotate, as a result of which the spindle 27 stops and the carriage 35 stops with it. At the moment the spindle stops, by means of a controllable engine (for example, from the CNC system) vodits transfer cross slide 36 with tool holder 37 for processing the next stage of the article 29. The rollers 17 then proceeds to the portion d to effect acceleration of the spindle to) the desired rotational speed, which is supported with a portion, as described above. Such a design of the spindle assembly makes it possible to carry out sequential threading in various stages with spindle stops at equal angles, during which the cutting tool is transferred to the next stage to be processed. The introduction of a gear rack assembly, which interacts with the differential and is controlled by a rotary drum, ensures a smooth, unstressed rotation of the spindle with stops in accordance with a given cycle, thus improving reliability and durability, as well as simplifying the design of the spindle assembly. Claims. The spindle unit of the machine for machining stepped stop threads, containing a connecting input shaft and a spindle, a kinematic chain in which is included. A differential with planet carrier and satellites, a spindle vortex cycle control mechanism with stops through a predetermined angle and a gear transmission setting the magnitude of the spindle rotation angle with a twin-pinion gear mounted on a pre-spindle shaft, characterized in that, g in order to simplify the design and improve reliability and durability, the mechanism for controlling the rotation cycle of the spindle is made in the form of a rotary drum having a closed spiral coil that interacts with the insertion into the spindle assembly movable in the longitudinal direction From the direction of the toothed rack, which meshes with one of the two-pinion gears, the second crown of which is coupled with the satellites of the differential, the carrier of which is knnematnically connected with the swivel Barab1 (1 1 -I / 7 L7 Zf22 2Z 26 I 2, Spindle assembly according to § 1, characterized in that the kinematic connection between the planet carrier and the rotary drum is made in the form of a worm gear, the worm gear of which is installed on the same axis with the rotary drum, and the worm to — on the dispensing shaft connected to the input shaft connected to the gear shaft a procedure linked with a toothed wheel made on a carrier. Sources of information taken into account in the examination I. Spindle node of the machine for processing stepped stop threads of the German company. Smyuier, 1914. 35 33 - W t but F fdo d -