SU818768A1 - Dynamometric mandrel for countersinking - Google Patents

Description

one

The present invention relates to mechanical engineering, in particular, can be used when reaming holes on metal-cutting lathes of the type equipped with adaptive control systems for elastic displacements of the AIDS system.

Dynamic mandrels for countersinking are known, comprising a hollow body and a measuring part with an amplifying device.

The disadvantage of such mandrels is their low accuracy of information on the magnitude and direction of elastic displacement at the end of the AIDS system. The mandrel designs do not allow measurement of elastic displacements caused by the action of the tangential component of the cutting force. Mandrels cannot be used for machining holes with additional support.

The aim of the invention is to measure the intrinsic elastic torsional deformations during countersinking.

The goal is achieved by the fact that the dynamometric mandrel for countersinking is provided with an outer tube, one end of which is fixedly mounted on the housing through the carrier sleeve and the other end freely on the rolling support located

in the tail part of the hollow body, and interacts with the measuring part. When this mandrel is equipped with a bolt-nozzle installed in the front of the housing,

internal channels which are used

for supplying cooling lubrication

fluid (coolant) in the working area of the countersink.

FIG. 1 schematically depicts a common

type of torque gauge for countersinking; in fig. 2 is a section A-A of FIG. one; in fig. 3 - scheme of using additional support.

The dynamometer mandrel consists of a hollow body 1 on which a fixed

installed by fitting and pins 2 supporting sleeve 3, which serves to fix the rotation of the mounted countersink 4. On the non-sleeve sleeve 3 with a diametrical clearance relative to the housing 1, an outer pipe 5 is fixed with one end representing rolling support. At the right end of the pipe 5 fixed two

Claims (2)

bracket 7, in which the core 8 of inductive contactless primary converters are located. Anchor 8 is made in the form of screws with a disk base. For fixing each core, nuts 9 are used. On the hollow case 1, opposite to the anchors 8, the brackets 11 are fixed by screws 10. On each of the brackets there is a coil 12 of inductance of the primary converter. The measuring part of the dynamometer mandrel is protected by a casing 13, which is attached to the hollow body 1. There is a gap between the casing 13 and the pipe 5, which allows the latter to rotate. On the cover 14, which closes the rear part of the casing 13, a connector 15 is installed, through which power is supplied to the inductance 12 and the signals from the latter are fed to the amplifying device 16 (UPU). The mounted countersink is fastened on a dynamometer mandrel by means of a hollow bolt 17 and a washer 18. A lubricant / coolant is supplied through the fitting 19. The size of the air gaps Aj and Ar between the working ends of the cores 8 and the inductors 12 is adjusted by moving the brackets 11 or the axial movement of the cores 8. Coolant to the working area of the countersink 4 is supplied both from the front and rear of the latter. The torque wrench is installed in the tool holder 20 of the lathe and rigidly attached thereto by means of bolts 21. To carry out machining using an additional 22 front support, a bolt assembly 23 is used instead of the bolt 17, which serves as a guide element of the torque wrench. The bolt head is precisely centered in the bore of the hollow body 1. The torque tool for countersinking works as follows. During the rough cantilever (the length of the hole in the workpiece B does not exceed 5-6 diameters of the latter), the countersink cylindrical part of the hollow mandrel body 1 is twisted under the action of tangential components of the cutting forces that occur on each tooth of the land countersink and applied relative to the axis of the mandrel at a distance equal to the radius of the hole. As a result of the twisting, the outer part of section I-I will change its angular position with respect to section II-II for section and-and the place of attachment of the mandrel in the tool holder 20 of the machine. In this case, the outer pipe 5 is rotated, since its left end is rigidly connected to the carrier sleeve 3 (and it is with body i), and the right end is based on the rolling support. As a result of the rotation of the tube relative to the cross section P-II, the angular position of the cores 8 relative to the inductors 12 changes. This leads to a change in the size of the air gaps D and L2 and, accordingly, to a change in the coefficients of self-induction of the spacers proportional to the angular rotation of the outer tube 5. Electrical signals from inductive primary transducers, proportional to the angular rotation of the outer tube, are summed up and fed to the UPA 16 ruchivani sectional relatively Senen II-II and II arisen magnitude of torque, and the tangential components of the cutting forces. When processing the input data of the workpiece (the value of the machining allowance, the hardness of the material being processed) and the cutting tool blunted, the value of the tangential component of the cutting force and, consequently, the torque, changes. This causes a change in the angle of rotation of the pipe 5 and the gaps AI and AZ. Electrical signals proportional to the resulting deviation of the angle of rotation of the pipe 5 are fed to the VGA, which generates a corresponding signal to make the necessary adjustment to the course of the processing of the holes or holes in the batch of blanks (for example, by changing the axial amount of the mandrel). Claims 1. Countersink bore with hollow body and measuring part with amplifying device, characterized in that, in order to measure its own elastic torsional deformations at countersinking, it is equipped with an outer tube, one end of which is fixed through a supporting sleeve on the case, and the other is free on the rolling support located in the tail section of the hollow case, and interacts with the measuring part. 2. The mandrel according to claim 1, distinguished by the fact that it is equipped with a bolt-nozzle installed in the front of the case, the internal channels of which are used to supply a cooling-lubricating fluid to the countersink work area. Sources of information taken into account in the examination 1. The author's certificate of the USSR 424693, cl. In 23B 35/00, published. 1974. 2. Authors certificate of the USSR 323194, cl. In 23В 49/00, published. 1972. / sixteen 23 (Pui.i 20