SU846148A1 - Arrangement to lathe for cutting inner threads - Google Patents

Description

The invention relates to a machine tool. It is known to adapt to a lathe for cutting an internal thread containing a mandrel mounted in a mandrel hole with the possibility of moving a sleeve in which a rod is mounted with a slider interacting with a cutting tool l A disadvantage of the known adaptation is the complexity of its design . The purpose of the invention is to simplify the design of the device. To achieve this goal, a bushing with a mandrel and a stem with a bushing are connected through threaded connections, and a hole with a longitudinal groove is made at the end of the stem, in which the rod inserted into the device with a pin that interacts with the groove the cutting tool and on the slider are made of interacting helical gears, and the rod has an interaction with the sleeve through a gear coupling inserted into the tool. FIG. 1 shows a device, a longitudinal section; in fig. 2 the same, top view; in fig. 3 shows section A-A in FIG. one; in fig. 4 shows a section BB in FIG. one; in fig. 5 shows a section B-B in FIG. 2. The device comprises a mandrel 1, in which there is a cutter 2 along the Other groove, as well as a radial feed mechanism for the cutter and a mechanism for automatically removing the cutter from the threaded groove. The structure of both mechanisms includes a device containing a helical gear 3, made on the cutter 2 and coupled at a right angle c. by the rail 4 on the slider 5, which is located in the longitudinal groove of the mandrel 1 and is closed by the lid 6. The slider 5 is connected by a lock with the rod 7, which is located in the axial hole of the mandrel. The rod has a threaded part forming a screw pair with an internal thread in the sleeve 8, on the outer surface of which a large step thread is cut, forming a screw pair with a thread of the mandrel 1. The sleeve 9 is fixedly attached to the sleeve 8, connected by an extension spring 10 to the body of the support 11 . In the hole of the rod 7 with the possibility of longitudinal

displacement is the rod 12

about the pin 13, entering the longitudinal

AZ of the rod 7. The collar of the rod enters the bore of the sleeve 8 and is secured against longitudinal movement by the toothed olumufta 14, screwed to the end

sleeves 8. On the square part of the rod 12 there is a spring-loaded half-coupling socket 15, with a limb, coupled with the half-coupling 14. The mechanism for automatically removing the cutter from the thread, besides the device described above, includes a stop 11, which is a sleeve that can be worn on the mandrel longitudinal movement. A key 16 protects the anvil case against rotation relative to the mandrel. The spring 17 of the housing of the emphasis is pressed against the restrictive ring 18 attached to the mandrel. On the right-hand end of the body of the anvil 11 there is a latch 19 for the handle 9, on the left end there is a movable anvil 20. The fixture is fixed in the tool holder of the turning machine with the holder 21 and screws 22.

The fixture works the following way.

The holder 21 is secured in the tool holder of the lathe. Frame 1 is inserted into the hole of the holder and secured with screws 22. Handle 9 rotates and pushes onto latch 19. In the rotation process, sleeve 8 moves along the thread of the large tag of the mandrel 1 together with the rod 7, permanently joining the number with a gear coupling of parts 14 and 15. Since the rod 7 is connected to the slide 5 with a lock, the latter also receives a longitudinal movement and with the rail 4 acts on the rail 3 of the cutters, due to which the cutter receives a partial displacement of a constant value depending on the thread pitch on the sleeve 8, the angle of its rotation and the gear ratio of the gear rack to the direction of the treated surface. The mandrel 1 is inserted into the hole in which the threads are to be cut, the cutter 2 must then be led to the surface to be machined before contact. This feed is made by a radial feed mechanism in the following manner.

Spring-loaded coupling half 15 is retracted to the right and rotates around an axis, while the rod 12 rotates, which pin 13 acts on the walls of the groove of the rod 7, causing the latter to rotate and move along the thread in the hole in the sleeve 8. The rod 7 is connected to the slide block

5 and through the slats 4 of the n / pc-uioM 2, which receives the radius: the feed. When the radial feed of the gear is stopped, the coupling closes again. Then the control 1 is removed from the hole and the radial feed mechanism through the limb on the coupling half 15 sets the depth of the first pass, at the end of the passage the mechanism EE automatically takes the tool out of the threaded groove. It works in the following way.

The movable stop 20 in contact with the end of the workpiece squeezes the spring, and the latch 19 lowers the handle 9, which under the action of the spring 10 rotates the sleeve 8 to its original position, while the sleeve receives movement along the axis. The amount of this movement depends on the thread pitch and the angle of rotation of the sleeve. Since the sleeve 8 is connected by a gear coupling to the rod 12 and through it to the rod 7 and the slider 5, which is connected to the cutter 2 by the rack 4, the latter receives a radial movement from the workpiece and leaves the thread. At this point, a support feed reversal is given, and the mandrel 1 is led out of the hole. The radial feed mechanism sets the depth of the j Toporo passage, etc.

Claims (1)

1. USSR author's certificate №61699, cl. B 23 G 5/12, 1939j