SU1333536A1 - Cutting tool having internal cooling - Google Patents

Abstract

The invention relates to metal working, namely to incisors with internal cooling. The aim of the invention is to increase the efficiency of crushing and chip removal by applying pressure pulses to the cutting zone. When cutting, lubricating cooling fluid (coolant) through channels 2 and 3 of housing 1, channel 8 of chipbreaker 4 and longitudinal grooves 13 on insulator 9 located in channel 8 are connected with them to laminate jets part 5 through the opening 14. The coolant in the recess I2 between the axial electrode 11 and the electrode 10 is at rest. When a high voltage pulse is applied to the electrodes 10 and 11, breakdown and hydraulic shock occur, the pressure of which through the hole 14 falls under the chips and breaks them. 3 il. & CO with CO JV CO O5

Description

The invention relates to metal working, namely to incisors with internal cooling.

The aim of the invention is to increase the efficiency of crushing and chip removal by applying pressure pulses to the cutting zone.

Figure 1 shows the cutter, top view; figure 2 - section aa in Fig .; in FIG. 3, node I in FIG. 2

The cutter comprises a housing 1 with channels 2 and 3 for supplying coolant (coolant), mounted on the housing 1 a chip breaker 4 and a cutting part 5 mounted on the housing; 1 by chip breaker A. The latter is fixed on housing 1 by means of cracker 6 and bolts 7. In chip breaker 4, channel 8 is made associated with channels 2 and 3 of case 1. In addition, the cutter contains insulator 9 fixed in channel 8 of the mattress 4, and electrodes 10 and P. In the insulator 9, there is a notch 12 on the side of the cutting part 5, and longitudinal grooves 13 on the outer surface thereof associated with the channel 8. The electrode 10 is connected to the housing 1 and fixed to the wall of the notch 12 the insulator 9, and the electrode 1 is fixed in the insulator 9 coaxially with the groove 2.

The cutter works as follows.

When cutting the coolant through the channels 2, 3, 8 and the longitudinal grooves 13 in the form of laminar jets is fed to the outlet 14 of the channel 8, through which it flows under the chips. In this case, in the cylindrical recess 12 there is a portion of the coolant in a state of relative rest.

During the cutting process, under normal conditions (without generating high pressure pulses), the coolant penetrates

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The contact surfaces of the chips and the frequency are thus repeated in the same 5 to a small depth. This establishes a state of dynamic equilibrium between the chip formation zones and the secondary plastic deformation in the workpiece, i.e. the processes in the chip formation zone depend on the contact processes in the secondary plastic deformation zone. An internal cooling cutter, comprising a housing with a cutting part and with channels for supplying coolant (coolant), is installed in a sequence.

The diameter of broken chips depends on the frequency of penetration of CO / K into the contact zone and corresponds to the generation frequency and high pressure pulses.

Claims (1)

Invention Formula The condition in the first zone cannot be changed without changing the stress state in another zone. When applied to electrodes 10 and a high voltage pulse, 55 A chip breaker on the body with a cadite breakdown of the electrode gap, ending with the formation of an electric discharge channel, which causes the occurrence of a shock wave opposite the outlet 14 - a water hammer. The energy of the shock wave passing through the hole 14 for chips 3 is spent on overcoming the resistance to penetration of liquid on the contact surfaces of the chips and the front surface of part 5. The coolant penetrating into the friction zone to a greater depth under the action of pulse pressure causes a significant change in the contact processes causing the transition to the boundary friction without significant second} plastic plastic deformations. In this case, the existing state of dynamic equilibrium between the chip formation zone and the zone of secondary plastic deformations is disturbed. When boundary friction occurs, the coefficient of friction between the chips and the front surface of the tool is significantly reduced, which leads to a change in the stress state in the contact zone of the chip - part 5. However, to meet the dynamic equilibrium condition, the stress state in the chip formation instantaneously changes. This change causes a discontinuity in the cutting layer in the chip formation zone, i.e. natural chip breaking. And further, the chips, touching the housing of the struc- turer, separate from the bulk. When a shock wave occurs, another portion of coolant or products of different reactions penetrate the contacting surface of the chip and tool. Thus, the cycle is repeated in the same sequences. The diameter of broken chips depends on the frequency of penetration of CO / K into the contact zone and corresponds to the generation frequency and high pressure pulses. Invention Formula a breaker with a channel connected to the channels of the housing, an insulator and electrodes placed in the housing, the first of which is installed in the isolator and the second is connected to the housing, characterized in that, in order to increase the efficiency of crushing and removal of chips . An undercut is made in the insulator on the side of the cutting part, the first electrode in the insulator is aligned coaxially with the undercut, and the second is on the wall of the undercut, and longitudinal grooves associated with the chip breaker channel are made on the outer surface of the insulator. Ft g / " / J tf Pas.j Editor L.Povkhan Compiled by V. Briskina Tehred M. Morgenthal Order 3910/15 Circulation 785 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 Proofreader A.T. sko