SU1209367A1 - Apparatus for working articles - Google Patents

Description

The invention relates to metal working, in particular, to a device for machining parts using automatic systems for controlling the movement of a part or tool.

The purpose of the invention is to show the accuracy of the machining performance of parts by making a self-propelled cutting head and controlling its speed depending on the magnitude of vibrations.

The device uses a non-power tool, the rigidity of which is infinite due to this technological solution, when the cutting head is located between two simultaneously processed parts, the longitudinal (relative) speed of the cutting head is determined by the angle of elevation of the helix on the intake cone part and the speed of rotation. blanks. The level of vibrations during cutting is estimated by the variable component of the thermo-EMF and is measured by the natural thermo-EMF of the thermocouple part-tool.

The drawing shows a diagram of a device for processing shafts.

The device contains machining parts 1, a cutting head 2, the latter and details 1 form a natural thermocouple, which is used as a sensor of frequencies and amplitudes of relative oscillations, device 3 for measuring thermal EMF, unit 4 for comparing the level of vibrations, unit 5, amplifier 6, controlled drive 7, spindle 8, gears 9-11, rod 12 and driven spindle 13.

The treatment is carried out as follows.

With rotating parts x 1 (their initial linear velocities are equal and directed in one direction and set according to the conditions of the kinematics of the cutting process and tool life) they are engaged with them. Cutting self-propelled head 2, made in the form of a milling cutter and consisting of three parts: fence, semi-finishing and finishing. The intake part of the cutting self-propelled head is tapered and provided with a screw thread, which creates, when the parts rotate, an axial force that freezes

cutting head along the machined parts. Next, the semi-finish and clean part of the cutting head enters the cutting process. At the moment of insertion, a thermo-emf of a natural thermocouple occurs; a cutting head — a part, which is measured by device 3 and fed as an electrical signal to a vibration control unit 4, in which a variable component of thermo-emf is released, proportional to the level of vibrations, occurring during cutting, and is compared with the predetermined level of vibrations from the setter 5.

If the vibration level specified in block 4 is exceeded, the error signal is extracted, which is supplied to the input of amplifier 6 (for example, a thyristor), the latter accumulates a control signal for the controlled drive 7, which regulates the rotation of spindle 8 and gears 9 and 11. The wheel 10 is parasitic and has free rotation relative to the rod of the spindle 12, and the wheels 9 and 11 are fixed on the spindle x 8 and 13. The rod 12 is fixed on the machine bed (not shown) between two simultaneously processed parts, and it also serves ravl guide for linear movement of self-propelled cutting unit 2. Performance increases with a processing scheme in several times, as several parts simultaneously processed, and the processing modes are increased in connection with povsh1eniem tool rigidity. In addition, the rotating tool has high resistance characteristics due to the optimum temperature conditions and does not require an additional feed drive.

The linear feed rate control system of the cutting head is made on standard elements and blocks. The cutting head is made of steel 9XC with a hardness of the cutting part of HPC 60. The supply of the cutting head (relative speed) varies within 0.02-0.54 mm / rev, as a function of the revolutions of the part, continuously adjustable from 200-1200 rev. / min The cutting head has the following basic parameters: angle of the intake cone 4 10 °, ugo. lifting screw grooves jW,

312093674

rake angle of semi-finish part to the axis at an angle in the plan, 4 12, rear. Chistov UGOL on the back surface d.7 °. the part, the angle of inclination of the screw groove. To reduce friction when cutting and 150, the cutting edges are inclined using coolant.

Compiled by V.Vlodavky Editor M.Blanar Tehred S.Migunova Proofreader G. Reshetnik

Order 364/7 Circulation 1000iSubscription

VShPI State Committee of the USSR

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

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Branch ShSh Patent, Uzhgorod, st. Project, 4

Claims (1)

DEVICE FOR PART DAYS ON a metal cutting machine, comprising a cutting head located between two parts equipped with a rotation drive and intended for their simultaneous processing, and a vibration sensor of the cutting head relative to the parts, characterized in that, for the purpose of increasing the accuracy and productivity of processing, the cutting the head is made in the form of a self-propelled milling cutter, consisting of three parts, the first of which is a fence and is made conical with a screw thread on it, and the second and third parts are responsibly in the semi-finished and final parts, the head is mounted with the possibility of rotation and axial movement along the axes of the workpieces, and a thermocouple sensor of a natural thermocouple is used as an oscillation sensor; rotation of parts. SU ,,, 1209367>