SU1699685A1 - Apparatus for setting tool motion route - Google Patents

Abstract

The invention relates to the processing of metals by pressure, in particular to the rotary drawing of shell parts. The purpose of the invention is to increase productivity. The device includes a copying system with elements of toolpaths mounted on a hydrosupport, systems for switching elements of motion paths and self-aligning

Description

The invention relates to the field of metal forming, in particular, to rotary drawing (PB) of shell parts without deliberate thinning, and can be used in automated lathe-pressing machines (ATDS) with a cyclic program control system (DSP).

The aim of the invention is to increase labor productivity by reducing the number of operations, reducing the production preparation time for the changeover of a machine with a cyclic program control system.

Figure 1 shows fragments of a hydraulic circuit with semi-structural elements; figure 2 - forming trajectories with PB.

The device contains a clamp 1, a pressing mandrel 2 on which the workpiece 3 is attached, an electrically insulated pressing roller 4 to which a low voltage is applied, mounted on a holder made in the form of a rocker arm 5 with supporting elements 6 interacting with the plunger 7, the reduced chamber 8 the pressure generated by the hydraulic station with the tank and the safety valve (not shown). The pressure roller 4 is electrically insulated from the rocker arm 5. The chamber 8 is mounted on the front of the movable slide 9 of the hydrosupport. Under the action of adjustable pressure in the chamber 8, the plunger 7, through the supporting elements 6, pushes the rocker arm 5 with the roller 4 up to the stop by the hinges 10 to the end of the oval grooves in the cheeks of the chamber 8.

The caliper 11 of the machine is driven by a hydraulic cylinder 12 innings. The hydrosupport carries the next slide valve 13. The plunger 7 is kinematically connected with the probe 14 of the pusher 15 and two hinges,

Elements 4-8 of the device constitute a hydraulic head, the hydraulic slide includes a movable slide 9, a follower

spool 13, probe 14, as well as other components and parts (fixed guides for the slide 9, the rod and the piston).

The hydraulic circuit of the device consists of valves 16-19, flow controllers 20-23, and a hydraulic sensor consisting of a housing 24, a plunger 25 and an adjusting screw 26 insulated from the housing. In the housing 24 there is a cylindrical cavity under the plunger 25. The chambers of the cylindrical cavity formed to the right and to the left of the plunger are connected by holes in the housing walls, respectively, with a drain.

hydrosupport and with discharge from the safety valve. In its lower part, the cylindrical cavity is connected via a slot-like channel to an opening in the wall of the housing connected to the tank of the hydrostation. The throttling elements of flow regulators 20 and 22 are driven into rotation by means of electromechanisms 27 and 28, the plunger 7 has a protrusion that, when moving it deep into the chamber, reduces.

The pressure is pressed to the limit switch 29. The distributor 16 serves to reverse the flow of oil in the trajectory formation mode, i.e. for reversing the motion of the slide 9 of the hydrospin. AT

in the copy mode, the electromagnet coil is de-energized. The distributor 17 connects an additional oil flow to the hydrosupport during the return pass. The distributor 18 serves to switch the automatic rotational rotation (ARV) programs. If the electromagnet coil is de-energized, then a group of flow controllers 20 and 21 (program I) is connected; if the electromagnet is turned on, it is connected

0 group of regulators 22 and 23 (program II), the inclusion of an electromagnet is possible (Fig. 2) at the transition point MRV - PRV (projection rotary extrusion) under the following simultaneous conditions: pressing

the limit switch 29, the absence of an electrical circuit in the hydro sensor and only upon completion of the roller smoothing the molded part of the shell when the machine slide moves to the left.

The principle of operation of a hydrosensor is based on a comparison of the variable costs of cf drain lines from the hydrosupport and from the safety valve of the hydrostation. In sum, these two flow rates are always constant and equal to the flow rate of the pump of the hydraulic station. Therefore, an increase (or decrease) in the flow rate at the drain of the hydraulic support valve inevitably leads to a decrease (or increase) in the flow rate at the drain through the safety valve.

If the slide 9 of the hydrosusport is stationary, the flow of fluid through the hydrosupport, and therefore; through the left chamber of the cylindrical cavity of the hydro sensor is zero. In this case, the entire flow rate from the pump of the hydroelectric station through the safety valve and the right chamber of the hydro sensor is drained into the tank. The pressure of the fluid passing through the right chamber of the hydrosensor cavity presses the plunger 25 to the adjusting screw 26. Thus, an electrical circuit creates a low-voltage power source + - intermediate relay coil (not shown in Fig. 1) - screw 26 - plunger 25 - housing 24 - grounding. If the slide 9 of the hydrosupport starts to move along its guides, the working fluid enters the left chamber of the hydrosensor gauge through the hydrosupport drain line. Through the right chamber of the cavity of the hydro sensor, the flow rate of fluid from the safety valve decreases as much as the flow rate of the drain through the left chamber increases. At some point, the pressure of the fluid in the left chamber will exceed the pressure in the right, and the plunger will shift to the right by opening the contact screw 26 - plunger 25 / The flow rate of the drained fluid from the hydraulic support is distributed by the speed of movement of the slide along the rails and the trajectory . The angle of inclination of the trajectory is determined by the geometric sum of the vectors: the speed vector of the working feed of the turning support 11 (constant value) and the speed vector of the movement of the slide of the hydrosupport along its guides. It follows from the above that by screwing in the adjusting screw 26, it is possible to establish the location of the electrical contact, which corresponds to the cost ratio in the left and right cavities of the hydro sensor, which determines the desired inclination of the movement trajectory during the PWD.

The distributor 19 serves to switch the hydraulic system from the copy mode to the formation mode of the loop-like paths using flow controllers. The switching on of the electromagnet is carried out under the same conditions as in the previous case, however, the electrocontact of the hydro sensor must be closed. The part of the hydraulic circuit that provides power to the feed cylinder 12 is not shown.

The device works as follows.

The flat disc metal blank 3 is mounted on the end of the pressing mandrel 2, fixed by the clamp 1, and a rotational movement is associated with it. In the initial position, the machine support 11 is to the right, so that the pressing roller 4 is to the right of the disk blank. Since the electromagnets of the 1b 19 distributors are de-energized, the oil from the hydraulic station 5 Cs enters the next slide valve 13, all the flow controllers pass. In the initial position, the plunger 7 is pushed under the pressure of the working fluid in the chamber 8 of the reduced pressure up to the stop by the balls 10 to the end of the oval groove. cavity hy.drosupport. AT

5, as a result of the slide 9, the hydrosupport is in its extreme forward position. Since the discharge flow from the hydrosupport is zero, the plunger 25 of the hydraulic sensor is pressed against the adjusting screw 26. With the button turned on, the cycle starts the working feed of the machine support 11, driven by a 12-cylinder hydraulic cylinder. The roller approaches the rotating workpiece and touches it. The test is started.

5 trajectories. At the moment of contact, the roller - circuit electrical circuit occurs, which is a signal for switching on the electromagnets of the distributors 16-19. Now working fluid from hydrostation

0 flows through the distributors 19m 18 to the flow controller 20 and after it through the distributor 16 to the next slide valve 13 through the discharge line. Since the core of the next slide valve 13 is shifted to the extreme

5, the left position, the working fluid flows unimpeded into the rodless cavity of the hydrosupport. The working fluid from the rod end through the distributor 16 enters the hydraulic sensor and the cable to the tank. The slide 9 of the hydrosupport starts moving away from the axis of the mandrel 2. The fluid flow passing through the left chamber of the hydro sensor cavity is greater than the flow passing through the right chamber (from the side of the safety valve), and the plunger 25 no longer closes the electrical circuit 26 - plunger 25 - body 24 (weight). However, the electromagnet of the distributor 18 is not turned on, since the limit switch 29 is not pressed.

As a result of the addition of two movements — the feed of the machine caliper 11 and the movement of the slide of the hydrosynchronous 9 — the trajectory of the forward movement is formed. If the ratio of the speeds of motion remains unchanged, i.e. in the case that the flow control throttle 20 is not driven by an electromechanical mechanism 27, the path is a straight line.

After the time relay contact has been triggered, the machine support feed 11 is reversed. At this moment, the rotation of the throttle of the flow controller 20 also stops (the electromechanism 27 stops) and at the same time the power supply circuit of the solenoid coil of the distributor 17 is broken. As a result, an additional oil flow is supplied to the hydrosupport through the flow controller 21. Since at the time of the reversal the valve of the distributor 16 also switches, the total flow of the working fluid is fed into the rod cavity of the slide of the hydrosupport. The hydraulic sensor plunger 25 still does not touch the adjusting screw 26. A reverse return path is formed right up until the roller is pressed onto the mandrel through the workpiece 3. At the moment the mandrel of the rocker 6 contacts the rocker, the plunger 7 is pressed, the working fluid from chamber 8 is displaced, the limit switch 29 is pressed, which provides the break of the power supply circuit of the electromagnet of the distributor 19. At the same time, the hydraulic system goes into copy mode. Fluid, by the flow controllers, is fed through the distributor 16 to the next spool 13, the effect on which through the pusher 15, the plunger 7 and the rocker arm 5 comes from the roller 4. This effect is determined during the feeding process by the forming mandrel. From the moment the mandrel roller is touched during a certain period of time determined by the setting of the time relay, the roller slides to the right along the molded shell section - an element of the operation called ironing. Distributor electromagnet 18 is not included. Upon completion of the ironing movement to the right, the machine caliper reverses the feed direction, and then the same ironing is carried out to the left. At the end of ironing to the left, depending on whether the electrical contact takes place screw 26 - plunger 25 - body 34 (weight), the hydraulic system either remains in copy mode, if there is no contact, or switches to

forming loop-shaped paths if there is a contact. This completes the test trajectory.

Formation of loop-shaped convex trajectories of MPI 1 on the first program

is carried out with the participation of the electromechanism 27. In the process of direct passes, with it, the throttle of the flow controller 20 is turned, and the flow of oil into the rodless

the cavity of hydro-dilyudra. As a result, a convex trajectory is formed.

If a low-voltage voltage is applied to the pressure roller, the direct passage path is convex at the time of the electrical contact of the roller-workpiece. If, however, the length of the forward path is determined by the setting of the time relay, the termination of this path occurs at the moment when the relay trips to

some intermediate point of the flange. The last option is implemented in a series of trajectories of the MHE 1 (Fig. 2), the first is the MRV 2. The electroautomatic system also provides the interruption of the convex trajectory

straight pass if the roller is obstructed in the form of a shoulder of the mandrel. The final loop-shaped trajectories of the MRI 1 are shown in FIG.

If at the end of the next trajectory and the subsequent double proglazhiv-nii roller will be on the plot of the generatrix with an angle of inclination, corresponding to the PWR mode, the process switches to this mode and simultaneously switches the ARV

On program II, the electromagnetic distributor 18 is turned on.

Now upon completion of the PDF, flow controllers 22 and 23 are involved in the formation of the trajectory. Since their adjustment differs from the adjustment of the regulators 20 and 21, the shaping mode in program II with the MPB 2 is completely autonomous.

Upon completion of the complete shaping process, the system enters the

copying, the machine caliper feeds to the right, and a total ironing of the whole casing occurs.

The pressure roller returns to its original position at the end of the mandrel.

The device allows ARVs to be very complex in configuration of shells at two levels.

The use of the proposed device for specifying toolpaths with self-tuning elements will significantly reduce the cost of manufacturing parts by reducing the number of operations, in general piece-calculating time. The efficiency of the device is higher, the more often the production objects are changed. In this respect, the proposed device is more effective than all known control systems, including numerical software.

The use of the device will allow at least 7-8 times to reduce the time of technology development in mastering the production of new parts, 2.5-3 times to reduce the time for changeover of the machine during the transition to the manufacture of the next product. Responding to the demands of flexibility and broad versatility, the device is particularly effective in the conditions of multi-product small-scale and individual production.

Claims (2)

1. An apparatus for setting toolpaths comprising a hydraulic station with a tank and a safety valve, a copying system with elements of toolpaths mounted on a hydrosupport, and a system for switching elements of movement trajectories, characterized in that it is equipped with a self-tuning system made in the form of two regulators of fluid flow with throttling elements and actuators of changing their flow area, two regulators of reverse passage yes liquids and four fluid flow distributors, the copying system is equipped with a follow valve, a probe mounted on a hydrosupport, a hydraulic head, a mounted hydrosupport and made in the form of a housing with a pressure-reducing chamber, in which a plunger with a protrusion and a rocker arm, kinematically connected with the tool and the plunger, are fitted with the possibility of free movement, interacting with the bump the plunger, and the plunger is connected with the following hydraulic slide valve by means of a gigabyte, the switching system of the elements of the movement trajectories is made in the form of a hydraulic fluid flow meter. 2. The device according to claim 1, wherein the hydro sensor is made in the form of a housing with a cylindrical cavity placed in a cylindrical cavity with the possibility of free movement a plunger and a slot-like channel located along the cylindrical cavity forming a cavity, while at one of the ends of the housing in the base zone of the cylindrical cavity an adjusting screw insulated electrically from the housing is mounted with the possibility of its end interacting with the end of said plunger; the connecting part of the cylindrical cavity on the side of the adjusting screw with the drain from the hydrosupport, the opposite part - with the discharge of the safety valve of the hydrostation and the output of the slit channel - with the tank of the hydrostation. / program Program Fie.2 triple trajectory