SU841888A1 - Electroerosion treatment plant - Google Patents

Description

The invention relates to EDM and can be used in machines and devices ’for processing precision holes.

A device for moving an electrode-tool is known, which comprises a vibrator mounted on the Base with a clip for an electrode-tool. In this case, the vibrator is connected with the feed mechanism flj.

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Closest to the proposed one is a device for moving a wire electrode-tool mounted on a machine for precision flashing holes in the bodies of sprayers of fuel nozzles, containing a drive for setting movements, as well as a drive for working movements of the electrode-tool, made in the form of an electromagnetic vibrator, movable part of which is equipped with clamping elements for ".......

capture of the electrode-tool, interacting with the expanding mechanism £ 2].

The disadvantage of this device is that the drives installation and working movements are combined ^S. kinematically with each other they have the same clamping elements. In this case, the operation of the electromagnetic vibrator is affected by its kinematic connections with the drive of the set ⁰ movements, which limits the possibility of increasing the vibration frequency and increases the lateral vibrations * of the moving part on which the electrode-tool is fixed.

The purpose of the invention is to improve the accuracy of processing.

This goal is achieved by the fact that both drives are kinemagically separated from each other, moreover, the movable part of the installation displacement drive is equipped with its own clamping links, and a distribution mechanism is introduced into the device, kinematically connected to the expandable drive of the working displacement drive and the clamping links of the installation drive displacements.

Figure 1 presents a structural diagram of a device; figure 2 section aa in figure 1; in Fig.Z - section bB in Fig.1; figure 4 - device, embodiment.

The device comprises a vibrator 1, on the movable part 2 of which a clip is fixed containing a prism 3 with a clamp 4. An electrode-tool 5 is mounted on the prism 3 with its axis being oriented along the vibration direction of the movable part 2 _{<0 The} clamp 4 is spring-loaded in the direction of the prism 3 and presses against her electrode tool

5. Springing is achieved due to the elastic properties of the material and the refined part. The clamp is connected to the drive 6 of the working and auxiliary feeds installed on the base 7 through the vibrator 1. On the base 7, the drive 8 of the compensation feed (installation displacements) is also installed, containing its own grip 9 with the drive 10, as well as the expanding mechanism Ί1 with the drive 12.

Actuators 8, 10, and 12 may be in the form of electromagnetic ^, hydraulic, or other known devices. Capture 9 is normally open. Drives 6,8,10 and 12 'are connected to the control mechanism 13 made ¹ , for example, in the form of a mechanical or electric programmed switch connected to the regulator of the interelectrode gap. The clamp is locked to the grip 9 in such a way that when the clamp is closed on the electrode-tool 5, the grip 9 is open, and when the clamp is open, the grip is closed. This blocking is carried out through the expanding device 11, which is made with the possibility of pairing with the clip 4 of the clamp and connected to the gripper 9.

The workpiece 15 is mounted on the fixture 14. The power tool 5 is fed along the axis of the hole being machined 16.

In the device (FIGS. 2-4), the expanding device 11 is made in the form of tongs, normally open with a spring, for connecting them with the clamp 4 of the clamp on the base 7, the pusher 17 is moved with the possibility of progressive 841888 4. The gripper 9 is made in the form of a pusher 18 and normally open ticks with thinned elastic sections.

₅ The grip 9 is interfaced with the electrode-tool 5 between the clamp and the vibrator 1. However, in order to further reduce the Beta of the clamp and the movable part 2 and, accordingly, increase the frequency and productivity of processing, the clamp can be interfaced with the electrode-tool 5 in other parts, for example, in the opposite side of the vibrator 1. Expandable 15 device 11 is connected to the grip either through the control mechanism 13 (figure 1), or by rigidly connecting the pushers 17 and 18, i.e. their execution in the form of a single block with 20 one drive 10 (Fig. 4 /. In this case, the drive 10 can be performed, for example, in the form of a lever system or cam (Fig. 3,4,). The drive 8 can be performed, for example, in in the form of a flat 25 κοηο or shaped spring-loaded cam (Fig. 4). Rotation of the drives (cams) 8 and 10 can be performed by one engine 19. A promising design option of the proposed device is the implementation of the vibrator 1 and the drive 6 of the working and auxiliary feed in the form of an electromagnetic device (Fig. .4), which contains winding 20, connected inennaya with the control mechanism 13. The winding 20 (Fig .. 4) is made on a fixed 'to.

parts of the vibrator 1, but can also be performed on the moving part 2., _{40 The} magnetic circuit of the fixed part of the vibrator 1 consists of mutually conjugate elements 21 and 22 having conical inner surfaces. The magnetic core of the movable frequency element _{4 5 is} made in the form of a conical ferromagnetic core 23, mounted on the membranes 24 and 25, mounted with the edges on the housing 26. The vibrator can be made, for example ₅₀ , on an electrodynamic principle ^ or on the basis of hydraulics, the Moving part 2 can be installed not only on elastic membranes 24.25 (Fig. 4 /, but also in other ways, ₅₅ for example, on a parallelogram mechanism or in bearings, but always with the possibility of translational movement along the axis of the electrode-tool 5 by a value of 5 not less than the value of the given working and auxiliary feeds. In the case when, when installing the mobile system on the membranes, in addition to the reciprocating vibrations, there are significant transverse vibrations of the mobile system, the electrode tool 5 can be additionally passed through the conductor, setting renewed in series with the clamp.

The device operates as follows.

. In the clamp of the vibrator I on its movable part 2 between the prism 3 and prizhi-. With the clamping clamp 4, an electric tool 5 is installed. For this, the spring-loaded part of the clamp 4 is squeezed from the prism 3 onto which the electrode-tool 5 is laid, after which the clamp is released. The processing cycle begins with the initial position of the electrode-tool 5. This is done by the compensation feed mechanism, the expanding device 11 of which, under the action of the drive 12, moves the clip 4 away from the prism 3, thereby releasing the electrode-tool 5 from the clamp. Simultaneously with this action, the gripper 9, locked with a clamp, under the action of the drive 10 captures the electrode-tool 5 and under the action of the drive 8 moves it to the workpiece 15 until it stops in its surface. Then, the expanding device 11 releases the clamp 4, and he presses the electrode-tool 5 to the prism 3 ". At the same time capture 9 mastered. " electrode-tool awaits 5. All switching and adjustments are carried out by the control mechanism 13. It is on-_. starts the drive 6 of the working and auxiliary feed, which leads the electrode-tool 5 from the workpiece 15 to a predetermined value. Interelectrode gap required for the process of EDM. Then, the actuator 6 moves the electrode tool 5 in the direction to the part 15 until an opening of a predetermined depth and diameter is obtained. After the end of the working feed, the drive 6 performs an auxiliary feed, removing the electrode tool 5 from the machined hole 16.3a, thereby the workpiece 15 is rotated to the next position or replaced with another, after which the cycle repeats, i.e. electrode-tool 5 is supplied by a com10 mechanism

841888 6 of the sensing feed to the workpiece 15 until it stops, etc. '

In the presented embodiment (FIGS. 2-4, the expansion device II and the gripper 9 are driven by a drive (cam) 10, which translates the pushers 17 and 18, rigidly connected to each other. The gripper 9 moves the electrode-inI tool 5 to the part 15 under the action of the actuator (cam) 8, which together with the actuator (cam) 10 is driven into rotation (one revolution per cycle / by the engine 19. Cam 8 or contacting it "capture 9 (made elastic) when the electrode-tool 5 rests on the part 15 are elastically deformed, thus preventing If the vibrator 1 (Fig. 4) is combined with the drive 6 of the working and auxiliary feed, made electromagnetic from the control mechanism 13, a direct current is supplied to the winding 20 and, by changing the magnitude of this current, the working and auxiliary ⁽ supply. From the mechanism 13 to the winding is also supplied with alternating current controlling the vibration, wherein the winding 20 can be made of two parts, one of which is supplied with direct and the other with alternating current. But you can perform winding and ordinary. In this case, both direct and alternating current are fed to it more, in other words, they are supplied with a pulsating current. Increasing the constant component of this current, the magnetic flux in the magnetic circuit is increased, and the core 23, being attracted to the mutually conjugated elements 21 and 22, is pulled into the vibrator 1. At the same time, the membranes 24 and 25 bend. body 26, and the clamp with the electrode-tool 5 moves in the direction from the part 15, i.e. auxiliary feed. When decreasing the direct current in the winding 20, the electrode-tool 5 moves to the part 15, i.e. work feed is in progress.

The device compared with the known. n 'allows one to reduce by approximately an order of magnitude the transverse vibrations of the electrode tool, which almost 3 times increases the accuracy of hole machining and significantly reduces the number of burns.

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Claims (2)

The invention relates to electrical discharge machining and can be used in machine tools and devices for processing precision holes. A device for moving the tool electrode is known, which comprises a clamping vibrator mounted on the base for a tool electrode. In this case, the vibrator is connected with the relay feed mechanism / The closest to the present invention is a device for moving a wire electrode tool, installed on a machine for precision piercing of openings in fuel injector housings, containing a drive of setting movements, as well as a drive of working movements of the tool electrode , you-, polyenny in the form of an electromagnetic vibrator, the movable part of which is equipped with clamping elements for gripping the electrode tool, interacting with the expanding mechanism 2. The disadvantage of this device is that the drives of the installation and working movements are kinematically connected to each other have the same clamping elements. At the same time, the operation of the electromagnetic generator is affected by its kinematic connections with the drive of the installation movements, which limits the possibility of increasing the frequency of vibration and increases the lateral oscillations of the movable part on which the electrode-tool is fixed. The purpose of the invention is to increase the processing accuracy. The goal is achieved by the fact that both drives are kinematically separated from each other, the moving part of the drive of adjusting movements is provided with its own clamping links, and a distribution mechanism is introduced into the device, kinematically connected to the expanding mechanism of the drive of working movements and the clamping links of adjusting movements. Figure 1 shows the structural diagram of the device; in Fig.2 a section aa in Fig.1; figure 3 - section bb in Fig .; Fig. 4 shows the device, version 1 of the structural embodiment. The device contains a vibrator 1, a clamp containing an prism 3 with a clamp 4 is fixed on the movable part 2. The prism 3 has an electrode-tool 5 with its axis oriented along the direction of vibration of the movable part 2, the clamp 4 is spring-loaded in the direction of the prism 3 and presses to There is an electrode-tool 5. Springing is achieved due to the elastic properties of the material and the refined part. The clamp is connected to the drive 6 of the working and auxiliary feed, installed on the base 7, through the vibrator 1. On the base 7, the drive 8 of the compensation feed is also installed (installation movements containing its own grip 9 with the drive 10, as well as the expansion mechanism 11 with the drive 12. Drives 8, 10, and 12 can be made in the form of electromagnetic, hydraulic, or other known devices. The grip 9 is normally open. Drives 6, 8, 10, and 12 are connected to the control mechanism 13, designed, for example, in the form of a mechanical or electrical device. The clamp is interlocked with gripper 9 in such a way that when clamped on the de-tool 5 tool, clamp 9 is open, and when clamp is open, the clamp is closed. configured to mate with the clamp 4 clamp and connected to the grip 9. The workpiece 15 is mounted on the fixture 14. The electric tool 5 is fed along the axis of the hole to be machined 16. In the device (Fig.2-4) imnoe device 11 is designed as a tongs, normally open by a spring, which is to mate with holder 4, the clamp on the base 7 mounted for movement postupa841888 Tel'nykh pusher 17. The lifter 9 is designed as a plunger 18 and a normally open mites with thinned resilient portions. The gripper 9 mates with the electrode-tool 5 between the clamp and the vibrator 1. However, in order to further reduce the Beta of the clamp and the movable part 2 and correspondingly increase the frequency and processing performance, the clamp can be mated with the electrode-tool 5 in other parts of it the opposite side of the vibrator 1. The expansion device 11 is connected to the gripper 9 either through the control mechanism 13 (Fig. 1) or through a rigid connection of the tappets 17 and 18, i.e. making them in the form of a single unit with one actuator 10 (Fig. 4. In this case, the actuator 10 can be made, for example, in the form of a lever system or cam (Fig. 3.4. The drive 8 can be made, for example, in the form of a plane or fasnr spring-loaded cam (Fig. 4K. Rotation of the Fivods (cams 8 and 10 can be performed by one engine 19. A promising option for the design of the proposed device is the implementation of the vibrator I and the drive 6 of the working and auxiliary feed in the form of an electromagnetic device (Fig. 4), which contains the winding 20 is connected I wired with the control mechanism 13. Winding 20 (Fig. 4) is made on the fixed k. part of the vibrator 1, but can also be mounted on the movable part 2. The magnetic core of the fixed part of the vibrator 1 consists of mutually conjugated elements 21 and 22, I have pixel Conical inner surfaces. The magnetic core of the movable part 2 is made in the form of a conical ferromagnetic core 23 mounted on membranes 24 and 25 mounted with edges on the housing 26. The vibrator can be made, for example, on the electrodynamic principle or on the basis of hydraulics. The mobile part 2 can be installed not only on elastic membranes 24,25 / 4/4, but also in other ways, for example on a paraplelogram-mechanism or B podshpnik, but necessarily with the possibility of translational movement along the axis of the electrode-tool 5 less than the value of the specified working and auxiliary feeds. In the case that when installing a movable system on the membranes, a chrome of reciprocating oscillations, and significant transverse oscillations of the movable system occur, the electrode-tool 5 can be additionally passed through a jig installed in series with the clamp. The device works as follows. In the clamp of the vibrator 1 on its bottom part 2 between the prism 3 and the clamp 4 of the clamp install the electrode tool 5. For this, the spring-loaded part of the clamp 4 is pressed from the prism 3 on which the electrode electrode 5 is placed, after which the presse is released. I start the processing cycle by setting the initial position of the electrode-tool 5. This is performed by the compensating feed mechanism, the expansion device 11 of which, under the action of the actuator 12, moves the clamp 4 away from the prism 3, thereby freeing the electrode-tool 5 from the clamp. Simultaneously with this action, the gripper 9 interlocked with the clamp, under the action of the actuator 10, captures the electrode-tool 5 and under the action of the actuator 8 moves it to the workpiece l5 until it stops against its surface. Then the unclamping device 11 releases the clamp 4, and it presses the electrode tool 5 to the prism J. In this case, the gripper 9 clears the electrode-tool 5. All the switching and adjustment is performed by the control mechanism 13. It turns on the actuator 6 of the working and auxiliary filing, which removes the electrode-tool 5 from the workpiece 15 to the specified value of the interelectrode gap required for the process of electro-electrodynamic processing. Then, the actuator 6 moves the electrode tool 5 in the direction of the part 15 to obtain an orifice of a predetermined depth and diameter. After the end of the working feed, the actuator 6 performs an auxiliary feed, exits the electrode tool 5 from the machined hole 16. Then the workpiece 15 rotates to the next position or is replaced by another, after which the cycle repeats, i.e. The electrode and tool 5 is supplied by a mechanism of compensation sensation feed to the workpiece 15 up to the stop, and so on. In the present embodiment (Figures 2-4), the expanding device II and the gripper 9 are driven by a drive (cam) 10 displacing the translational pushers 17 and 18 rigidly connected to each other. The gripper 9 moves the electrode tool 5 to the part 15 under the action of a drive (cam) 8, which together with the drive (cam 10 is driven into rotation (one revolution per cycle by motor 19. Cam 8 or contact gripper 9 with it (made elastic)) The electrode electrode 5 is resiliently deformed into the part 15, thus preventing excessive deformations. If the vibrator 1 (FIG. 4 is combined with the drive 6 of the working and auxiliary feed, made electromagnetic from the control mechanism 13, a constant current is applied to the winding 20 and cheating. The source of this current is controlled by the working and auxiliary feed. From the mechanism 13, an alternating current controlling vibration is also supplied to the winding 20. At the same time, the winding 20 can be made of two parts, one of which is supplied with a constant and another current. However, it is possible to wind and ordinary. In this case, constant and alternating current are simultaneously applied, i.e., they are fed with a pulsating current, increasing the constant component of this current, increasing the magnetic flux in the magnetic core, and core 23, converse, to zaimno mating elements 21 if 22 is drawn inwardly of the vibrator 1. Thus the membrane 24 and 25 are all yielding with respect to the housing 26, and clamp the electrode-tool 5 is moved in a direction away from the workpiece 15, t.e, osuschest | is the auxiliary supply. When the DC current in the winding 20 decreases, the electrode tool 5 moves to the part 15, i.e. The working feed is completed. The device is compared with the known. This makes it possible to reduce the transverse oscillations of the electrode tool by about three times, which increases the hole machining accuracy by almost 3 times and significantly reduces the number of burns. Claims of the invention are Device1; 1CrHW for electro-eosiric. machining parts with a rod-type electrode-tool- type, containing a drive of installation movements, as well as a drive of working movements of the electrode-tool, made in the form of an electromagnetic vibrator, the movable part of which is equipped with elastic elements for clamping the tool-electrode, interacting with expanding mech-anism, About this - that is, so that, in order to increase the machining accuracy: Both drives are kinematically separated. 8418 J 0 5 88 whereby the movable part of the actuator installation movements is provided with its own clamping links, and the distribution mechanism is introduced into the device, kinematically connected to the expansion mechanism and clamping links. Sources of 11 information taken into account during the examination 1. Panin G. I. Fefelov I., A. Mechanization of the processing of precision parts. L ,, Mechanical Engineering, 1972, p. 276-280, p. 147. 2. USSR author's certificate No. 407702, cl. B 23 P 1/08, 1973. A-A (rig 2 6s