SU921729A1 - Apparatus for cutting thread - Google Patents

Description

(54) DEVICE FOR THREAD CUTTING

one

The invention relates to chiselling and can be used in metal-cutting machines, aggregate and automatic lines for threading. A threading device is known in which case there are driving and driven spindles interconnected with each other and with an electromagnet consisting of a stator and a core 1.

A significant drawback of the known device is the difficulty of obtaining a higher oscillation amplitude of the driven spindle, which ensures high quality threads in difficult-to-work materials.

The purpose of the invention is to improve the quality of cut threads in difficult-to-cut materials.

The goal is achieved by inserting an end cam located on the drive spindle, the rods in contact with it and installed on the driven spindle, an intermediate roller and a ball coupling connecting the end of the driven spindle and the intermediate roller, a sleeve with a slope of 11Hfvni grooves installed 1 the free end of the intermediate roller, a rod with a finger that is placed in the groove of the sleeve, a membrane mounted on and ampoule and connected to the rod, while the electromagnet measles is placed on the rod, and its stator is in the device case.

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FIG. 1 shows the proposed device, a longitudinal section; in fig. 2 a cam sweep} in FIG. 3 - sleeve with inclined slots, seen from above.

The device includes a housing 1, in which a quill is placed. A rotor 3 is installed on the shawpee 2, which is in contact with the cam 4, the leading spindle 5 is placed on the quill 2, on which the drive wheel 6, the face X cam 7 and the membrane 8 are mounted. In the case of threading with a different pitch, an interchangeable cam is mounted on the driving spindle 5. In the master spindle 5

Set the spindle 9 with a device for attaching the thread-luerd tool 10, for example, a tap. On the driven spindle 9 there are reinforced roles 1Ш 11 that are in contact with the end cam 7, the end face cam 7 has two curves of elevation equal to the angle of the thread rise thread-forming tool. A kinematic closure ensures a spring 12, At the rear end of the driven spindle 9 a ball clutch 13 is installed, the balls of which fit into the grooves of the shaft 14 placed inside the leading linshell 5. On the roller 14, the sleeve 1b is rigidly fixed with two slots, with walls of which the pin 16 is fixed in the rod 17. The rod 17 is connected via a membrane 8 to the leading sheeter 5. On the right rod 17 is installed the measles 18 of the electropump, the stator 19 of which is fixed in the quillies 2, The workpiece 20 is also shown on the line. phenomenon working cycle track (not shown).

The proposed device works as follows.

When turning on the drive, the driving spindle 5 rotates through the drive wheel 6, and the roller 3 with the quill 2 gets axially displaced from the cam 4. Between these movements there is a hard kinematic link — one turn of the leading spindle the quill moves the quill spacing . Simultaneously with the rotation and axial movement of the driving spindle 5, the rotation is transmitted through the membrane 8, the rod 17, the sleeve 15, the roller 14, the ball coupling 13 to the driven pin: indel 9, in which the thread forming tool 10 is fixed. The ball coupling 13 provides the axial mixing of the spindle 9 regarding shaft 14 and them. transverse relative displacement.

Simultaneously with the rotation of the drive, an alternating voltage is applied to the electromagnet stator 19. The anchor 18 receives axial vibrations, which are transmitted by the rod 17 to the finger 16. The finger 16 contacts the walls of the inclined pezas of the sleeve 15, the co-ora through the latter receives a twist of the ShzS oscillations. Torsional vibrations by means of the roller 14, the ball clutch 13 are transferred onto the driven spindle.

9. Driven Schlindel 9 receives torsional vibrations, which through rollers 11 and face cam 7 are transformed into vibrations along a helical line.

The amplitude of the oscillations of the driven spin 9 can be quite high and reach values

A (,

where D is the nominal diameter of the thread;

SL - the width of the pen tap;

P - the number of feathers tap;

oL. lifting angle of the cut thread.

Thus, the thread-forming tool Yu obtains rotation and cce displacement and additional oscillations along the helix corresponding to the pitch of the thread being cut.

When moving the pintles 2 with the tap 10 in the part 2O, a thread is cut. Upon reaching the required cutting length, a command is issued to the control circuit of the device to reverse the drive. The tap is unscrewed from the workpiece 20. The quench 2 returns to its original position.

The use of the proposed device allows to improve the quality of the threads being cut, as the tool oscillates along a helical line, which allows to reduce the contact friction between the tap and the thread being cut, improve the chip condition, and the helix oscillations coinciding with the screw line cut threads, do not break the thread and do not contribute to the formation of waviness on the coils of the latter, moreover, a rigid kinematic connection is provided between the tool rotation and its movement - and one turn of the spindle, the tap moves by the pitch of the thread being cut, and the resulting oscillations can be increased in amplitude to a significant amount

1SH1.

The proposed device also makes it possible to reduce losses from scrap and to increase the durability of the tap, since tool wear on the back surface and improved machining accuracy and machining of difficult-to-cut materials.

Claims (1)

1. USSR author's certificate No. 565783, cl. In 23G, 1/16, 1976. FIG. Fig 3