An electric discharge composite machining tool and its working method

Abstract

The present invention discloses an electric discharge composite machining tool and its working method, which relates to the field of welding, and includes a truss, a base, a gear drive module, a lead screw drive module, a telescopic rod, and an electric discharge machining module; the truss includes a vertical frame and a cross beam; the truss is arranged on the base; the gear drive module is arranged on the base, and the gear drive module is located below the truss. The present invention overcomes the technical problem that the machining points of the existing electric discharge machine tool are restricted, and provides a reliable solution for multi-angle electric discharge machining. This kind of electric discharge composite machining tool and its working method adjust the machining points of the electric discharge machining module through an adjustment mechanism in which the gear drive module, the lead screw drive module, and the telescopic rod cooperate with each other; by arranging the workpiece in the through hole inside the guiding frame, the electric discharge machining points can be arranged at any point on the outer peripheral surface of the workpiece, and welding can be performed on each outer peripheral surface of the workpiece.

Description

Technical Field

[0001] The present invention relates to the technical field of welding, and particularly to an electric spark composite machining tool and its working method. Background Art

[0002] The dielectric used in electric spark machining directly affects the efficiency, accuracy, surface quality, and environmental protection of this machining process. The commonly used dielectrics in industry mainly include oil-based working fluids and water-based working fluids. Oil-based working fluids have high machining accuracy, but there are fire hazards, harmful gases will be released during the machining process, and the carbon precipitated during the machining process will affect the machining stability and efficiency; water-based working fluids have no fire hazards, but there is electrolytic corrosion during machining, which will seriously affect the machining accuracy and may rust the machine tool. Further, the oil bath and water bath limit the machining of workpieces at multiple angles; for this reason, the prior Chinese patent application number CN201710023496.8 proposed a technical means of adding a coaxial high-speed air jet to improve the electric spark machining efficiency in the atmospheric pressure cold plasma jet; the prior Chinese patent application number CN201910139858.9 proposed a quasi-dry high-speed electric spark machining method, using a mixture composed of the atmospheric pressure cold plasma jet proposed in the invention patent with the patent number CN201610874299.2 and the coaxial spray jet proposed in the present invention as the dielectric for electric spark machining, and applying ultrasonic vibration to the workpiece at the same time; during operation, the tool electrode is connected to the negative pole of the pulse power supply, the workpiece is connected to the positive pole of the pulse power supply, the mixed dielectric composed of the cold plasma jet and the coaxial spray jet is applied between the tool electrode and the workpiece, and the nozzle position is adjusted to ensure that the area to be machined is completely submerged in the mixed dielectric and will not interfere with the machine tool during machining. The motion command is transmitted to the machine tool motion platform through the control computer, and the feed speed is adjusted in time according to the machining feedback signal. After machining is completed, the device for generating the mixed dielectric of the cold plasma jet and the coaxial spray jet and the electric spark machining tool are turned off.

[0003] Based on the existing technology, the present invention aims to research and propose a reliable solution for multi-angle electric spark machining, which can be separated from the oil-based working fluid pool or the water-based working fluid pool, thereby overcoming the technical problem that the machining points of the electric spark machine tool are restricted. Summary of the Invention

[0004] Based on the existing technology, the present invention provides an electric spark composite machining tool and its working method.

[0005] In order to solve the above technical problem that the machining points of the electric spark machine tool are restricted, the present invention provides the following technical solutions:

[0006] The present invention claims protection for an electrospark compound machining machine tool, comprising a truss, a base, a gear drive module, a lead screw drive module, a telescopic rod and an electrospark machining module;

[0007] The truss includes a vertical frame and a horizontal beam; the truss is arranged on the base; the gear driving module is arranged on the base, and the gear driving module is located at the lower part of the truss;

[0008] The lead screw drive module is arranged on one side of the vertical frame of the truss; the two ends of the telescopic rod are respectively hinged to the gear drive module and the lead screw drive module; the side of the telescopic rod close to the gear drive module is connected to an electric spark machining module.

[0009] As a preferred technical solution of the present invention, the screw drive module and the gear drive module cooperate with each other to adjust the position of the telescopic rod in the vertical and horizontal directions, and adjust the position of the screw drive module in the vertical and horizontal directions; thereby, the electrospark machining points can be arranged at any position around the outer peripheral surface of the gear drive module; the specific arrangement of the electrospark machining points will be elaborated in detail in subsequent solutions.

[0010] As a preferred technical solution of the present invention, the gear drive module includes a bracket, a guide frame, a gear guide groove, a guide wheel guide groove, a through hole, a gear, a gear drive motor, a gear ring, a guide wheel and an adapter; the guide frame is detachably arranged on the bracket; the through hole is arranged at the center of the bracket; the gear guide groove is arranged on the periphery of the through hole; the gear ring is arranged on the periphery of the gear guide groove; the guide wheel guide groove is integrally formed on the outside of the guide frame; the gear is meshed with the gear ring, the gear is connected to the gear drive motor, and the guide wheel is slidably arranged in the guide wheel guide groove; the gear and the guide wheel are respectively arranged on both sides of the adapter.

[0011] As a preferred technical solution of the present invention, the through hole and the gear guide groove are both arranged inside the guide frame; the through hole enables the workpiece to be processed to pass through the guide frame, and the electrospark machining points are arranged around the outer circumference of the gear driving module, thereby realizing welding operations on specific points of the workpiece; the adjustment part of the electrospark machining point is carried out in the following manner: the gear and the guide wheel are respectively arranged on both sides of the adapter, the gear driving motor drives the gear to move on the gear ring, the guide wheel rotates in the guide wheel guide groove, and plays a limiting role in the movement of the above-mentioned gear; when the gear moves to a certain point on the gear guide groove, the electrospark machining module also moves to a corresponding point accordingly.

[0012] Particularly, one end of the telescopic rod is connected to the adapter.

[0013] As a preferred technical solution of the present invention, the lead screw drive module includes a lead screw drive motor, a lead screw, and a drive nut.

[0014] The drive nut sleeved on the lead screw makes a reciprocating linear motion along the lead screw under the drive of the lead screw drive motor; and one end of the telescopic rod is hinged to the drive nut; as the lead screw reciprocates, one end of the telescopic rod makes a swinging motion; the drive nut and the telescopic rod can provide suspension support or abutment support for the electric discharge machining module.

[0015] By adopting the above technical solution, when the gear approaches or is located at the top of the gear ring, the drive nut can be driven to move to the lower part of the lead screw. At this time, the telescopic rod provides abutment support for the electric discharge machining module; when the gear approaches or is located at the bottom of the gear ring, the drive nut can be driven to move to the upper part of the lead screw. At this time, the telescopic rod provides suspension support for the electric discharge machining module.

[0016] As a preferred technical solution of the present invention, one side of the drive nut is connected to a hinge seat, and the hinge seat is connected to the telescopic rod through a Hooke's joint.

[0017] As a preferred technical solution of the present invention, the electric discharge machining module includes a motor, a rotating seat, a second lead screw drive module, and a welding head; the motor is arranged on the adapter, and the rotating seat is arranged at the rotating output end of the motor; the welding head is connected to the rotating seat through the second lead screw drive module.

[0018] After the electric discharge machining module reaches the electric discharge machining point, the angle of the welding head is adjusted by the motor so that the welding head faces the workpiece; at this time, the distance between the welding head and the workpiece is adjusted by the second lead screw drive module, and electrode pulse discharge is carried out to complete the electric discharge welding operation.

[0019] As a preferred technical solution of the present invention, the processing machine tool further includes a suspension support module, and the suspension support module includes a second gear, a rack, a second telescopic rod, and a second gear drive mechanism; the rack is arranged on the cross beam; the second gear meshes with the rack; one end of the second telescopic rod is connected to the adapter in a rotating manner, and the other end is hinged to the second gear.

[0020] By adding a second telescopic rod, the support stability of the electric discharge machining module can be further increased. Specifically, the support stability is improved by forming a triangular stable structure with the telescopic rod and the endpoints of the second telescopic rod.

[0021] A working method for an electro-discharge composite machining tool, comprising the following steps:

[0022] 1) Assemble the electro-discharge composite machining tool and arrange the workpiece on the workbench;

[0023] 2) Drive the gear to move to the machining position, adjust the telescopic rod and the lead screw drive module to complete the support for the electro-discharge machining module;

[0024] 3) Adjust the rotating seat of the electro-discharge machining module to align the welding head with the welding position; adjust the distance between the welding head and the welding position through the second lead screw drive module;

[0025] 4) Connect the welding head electrode and the workpiece electrode, and perform pulsed discharge to complete the welding of one position;

[0026] 5) Continuously repeat steps 1)-4) to complete the operations at all welding positions.

[0027] Among them, in step 2), the telescopic rod is equipped with corresponding first displacement sensors and pressure sensors, the lead screw drive module is provided with second displacement sensors, and the gear drive motor is provided with a motor counter; the first displacement sensors, second displacement sensors, pressure sensors, and motor counters are all connected to the data acquisition module; the data acquisition module is connected to an MPU (microprocessor); the electro-discharge machining module is accurately moved to the machining position through calculation and control by the microprocessor.

[0028] In addition, in step 2), the accurate control of the machining position can also be achieved through a CCD industrial camera.

[0029] In step 4), the welding head uses a mixture composed of coaxial spray jets as the electro-discharge machining medium, and a vibration member (such as a transducer) can be selectively set to apply ultrasonic vibration to the workpiece.

[0030] In step 5), the operations at different welding positions can be achieved by moving the electro-discharge machining module without moving the workpiece to adjust the electro-discharge machining position.

[0031] The beneficial effects of the present invention are:

[0032] For this electro-discharge composite machining tool and its working method, the machining position of the electro-discharge machining module is adjusted through an adjustment mechanism that cooperates with each other by a gear drive module, a lead screw drive module, and a telescopic rod. By arranging the workpiece in the internal through hole of the guiding frame, the electro-discharge machining positions can be arranged at multiple positions on the outer peripheral surface of the workpiece, and welding can be performed at multiple positions on the outer peripheral surface of the workpiece.

[0033] This kind of electric discharge machining compound machine tool and its working method improve the support stability by adding a suspension support module, so that the triangle formed by the end points of the telescopic rod and the second telescopic rod constitutes a triangular stable structure; thereby further improving the support stability of the electric discharge machining module. By arranging two groups of spark machining modules on both sides of the gear drive module, the possible electric discharge machining points can be further expanded; and the problem of reduced accuracy of the welding points that may occur when welding other points of the workpiece is avoided; at the same time, the arrangement of the two groups of electric discharge machining modules can further improve the machining efficiency.

[0034] This kind of electric discharge machining compound machine tool and its working method avoid the problem of restricting the welding points by immersing the workpiece in an oil bath or a water bath by using a mixture composed of coaxial spray jets as the electric discharge machining medium. Brief Description of the Drawings

[0035] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0036] Figure 1 is the first structural schematic diagram of an electric discharge machining compound machine tool of the present invention;

[0037] Figure 2 is the second structural schematic diagram of an electric discharge machining compound machine tool of the present invention;

[0038] Figure 3 is the first schematic diagram of the transmission structure of the present invention;

[0039] Figure 4 is the second schematic diagram of the transmission structure of the present invention;

[0040] Figure 5 is the structural schematic diagram of the adapter of the present invention;

[0041] Figure 6 is Figure 2 the partial enlarged view of the suspension support module of part A in

[0042] Figure 7 is the structural schematic diagram of the guiding frame of the present invention;

[0043] Figure 8 is the structural schematic diagram of the electric discharge machining module of the present invention;

[0044] Figure 9 is the structural schematic diagram of Embodiment 3 of the present invention.

[0045] In the figure: 1. Truss; 1.1 Vertical frame; 1.2 Cross beam; 2. Base; 3. Gear drive module; 3.1 Bracket; 3.2 Guide frame; 3.3 Gear guide groove; 3.4 Guide wheel guide groove; 3.5 Through hole; 3.6 Gear; 3.7 Gear drive motor; 3.8 Ring gear; 3.9 Guide wheel; 3.10 Adapter; 4. Lead screw drive module; 4.1 Lead screw drive motor; 4.2 Lead screw; 4.3 Drive nut; 5. Telescopic rod; 6. Electric discharge machining module; 6.1 Motor; 6.2 Rotary seat; 6.3 Second lead screw drive module; 6.4 Welding head; 7. Suspension support module; 7.1 Second gear; 7.2 Rack; 7.3 Second telescopic rod; 7.4 Second gear drive mechanism. Detailed implementation mode

[0046] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0047] Embodiment 1:

[0048] As Figures 1 - 9 shown, the present invention claims protection for an electric discharge composite machining machine tool, including a truss 1, a base 2, a gear drive module 3, a lead screw drive module 4, a telescopic rod 5, and an electric discharge machining module 6; the truss 1 includes a vertical frame 1.1 and a cross beam 1.2; the truss 1 is arranged on the base 2; the gear drive module 3 is arranged on the base 2, and the gear drive module 3 is located below the truss 1; the lead screw drive module 4 is arranged on the vertical frame 1.1 of the truss 1; both ends of the telescopic rod 5 are hinged to the gear drive module 3 and the lead screw drive module 4 respectively; an electric discharge machining module 6 is connected to the side of the telescopic rod 5 close to the gear drive module 3.

[0049] Among them, through the mutual cooperation of the lead screw drive module 4 and the gear drive module 3, the position of the telescopic rod 5 in the vertical and horizontal directions is adjusted, and the position of the lead screw drive module 4 connected to one side of the telescopic rod 5 in the vertical and horizontal directions is adjusted; thus, it can be realized that the electric discharge machining points can be arranged at any position around the outer peripheral surface of the gear drive module 3; the specific arrangement method of the electric discharge machining points will be described in detail in the subsequent solutions.

[0050] Among them, the gear drive module 3 includes a bracket 3.1, a guide frame 3.2, a gear guide groove 3.3, a guide wheel guide groove 3.4, a through hole 3.5, a gear 3.6, a gear drive motor 3.7, a gear ring 3.8, a guide wheel 3.9, and an adapter 3.10; the guide frame 3.2 is detachably arranged on the bracket 3.1; the through hole 3.5 is arranged at the center of the bracket 3.1; the gear guide groove 3.3 is arranged on the outer periphery of the through hole 3.5; the gear ring 3.8 is arranged on the outer periphery of the gear guide groove 3.3; the guide wheel guide groove 3.4 is integrally formed on the outside of the guide frame 3.2; the gear 3.6 meshes with the gear ring 3.8, the gear 3.6 is connected to the gear drive motor 3.7, the guide wheel 3.9 is slidably arranged in the guide wheel guide groove 3.4; the gear 3.6 and the guide wheel 3.9 are respectively arranged on both sides of the adapter 3.10.

[0051] Among them, the through hole 3.5 and the gear guide groove 3.3 are both arranged inside the guide frame 3.2; the through hole 3.5 enables the workpiece to be processed to pass through the inside of the guide frame 3.2, and the electric discharge machining points arranged around the outer peripheral surface of the gear drive module 3 can realize the welding operation of specific points on the workpiece; the adjustment of the electric discharge machining points is carried out in the following way: the gear 3.6 and the guide wheel 3.9 are respectively arranged on both sides of the adapter 3.10, the gear drive motor 3.7 drives the gear 3.6 to move on the gear ring 3.8, the guide wheel 3.9 rotates in the guide wheel guide groove 3.4, and plays a limiting role in the movement of the above-mentioned gear 3.6; when the gear 3.6 moves to a certain point on the gear ring 3.8, the electric discharge machining module 6 on the telescopic rod 5 also correspondingly moves to a corresponding point.

[0052] Particularly, one end of the telescopic rod 5 is hinged to the adapter 3.10.

[0053] Among them, the lead screw drive module 4 includes a lead screw drive motor 4.1, a lead screw 4.2, and a drive nut 4.3.

[0054] The drive nut 4.3 sleeved on the lead screw 4.2 makes a reciprocating linear motion along the lead screw 4.2 under the drive of the lead screw drive motor 4.1; and one end of the telescopic rod 5 is hinged to the drive nut 4.3; as the lead screw 4.2 reciprocates, one end of the telescopic rod 5 makes a swinging motion; the drive nut 4.3 and the telescopic rod 5 can provide suspension support or abutment support for the electric discharge machining module 6.

[0055] Specifically, when the gear 3.6 is close to or located at the top of the gear ring 3.8, the drive nut 4.3 can be driven to move to the lower part of the screw 4.2. At this time, the telescopic rod 5 provides abutment support for the EDM module 6; when the gear 3.6 is close to or located at the bottom of the gear ring 3.8, the drive nut 4.3 can be driven to move to the upper part of the screw 4.2. At this time, the telescopic rod 5 provides suspension support for the EDM module 6.

[0056] One side of the driving nut 4.3 is connected to an articulated seat 4.4, and the articulated seat 4.4 is connected to the telescopic rod 5 through a Hooke's hinge.

[0057] Among them, the EDM module 6 includes a motor 6.1, a rotating seat 6.2, a second screw drive module 6.3, and a welding head 6.4; the motor 6.1 is arranged on the adapter 3.10, and the rotating seat 6.2 is arranged on the rotation output end of the motor 6.1; the welding head 6.4 is connected to the rotating seat 6.2 through the second screw drive module 6.3.

[0058] After the EDM module 6 reaches the EDM point, the motor 6.1 is used to adjust the angle of the welding head 6.4 so that the welding head 6.4 faces the workpiece; at this time, the distance between the welding head 6.4 and the workpiece is adjusted by the second lead screw drive module 6.3, and the electrode pulse discharges to complete the EDM welding operation.

[0059] Embodiment 2:

[0060] See also Figure 3 Compared with the first embodiment, the processing machine tool further includes a suspension support module 7, which includes a second gear 7.1, a rack 7.2, a second telescopic rod 7.3, and a second gear drive mechanism 7.4; the rack 7.2 is arranged on the crossbeam 1.2; the second gear 7.1 is meshed with the rack 7.2; one end of the second telescopic rod 7.3 is connected to the adapter 3.10, and the other end is hinged to the second gear 7.1.

[0061] By adding the second telescopic rod 7.3, the support stability of the electrospark machining module 6 can be further increased. Specifically, the support stability is improved by forming a triangular stable structure with the triangles formed by the telescopic rod 5 and the ends of the second telescopic rod 7.3.

[0062] Embodiment three:

[0063] See also Figure 9 The screw drive module 4, the telescopic rod 5, the electric spark machining module 6 and the suspension support module 7 can be two groups.

[0064] Embodiment 4:

[0065] The usage method includes the following steps:

[0066] 1) Assemble the electric discharge machining compound machine tool and arrange the workpiece on the workbench;

[0067] 2) Drive the gear 3.6 to move to the machining point, and adjust the telescopic rod 5 and the lead screw drive module 4 to complete the support for the electric discharge machining module 6;

[0068] 3) Adjust the rotating seat 6.2 of the electric discharge machining module 6 to make the welding head 6.4 face the welding point; adjust the distance between the welding head 6.4 and the welding point through the second lead screw drive module 6.3;

[0069] 4) Connect the welding head electrode and the workpiece electrode, and perform pulsed discharge to complete the welding of one point;

[0070] 5) Continue to repeat steps 1)-4) to complete the operations at all welding points.

[0071] Among them, in step 2), the telescopic rod is configured with corresponding first displacement sensors and pressure sensors, the lead screw drive module is provided with second displacement sensors, and the gear drive motor is provided with a motor counter; the first displacement sensors, second displacement sensors, pressure sensors, and motor counter are all connected to the data acquisition module; the data acquisition module is connected to the MPU (microprocessor); the electric discharge machining module is accurately moved to the machining point through calculation and control by the microprocessor.

[0072] In addition, in step 2), the accurate control of the machining point can also be achieved through a CCD industrial camera.

[0073] In step 4), the welding head uses a mixture composed of coaxial spray jets as the electric discharge machining medium, and a vibration member (such as a transducer) can be selectively set to apply ultrasonic vibration to the workpiece.

[0074] In step 5), the operations at different welding points can be achieved by moving the electric discharge machining module without moving the workpiece to adjust the electric discharge machining point.

[0075] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electrospark compound machining machine tool, characterized in that: It comprises a truss (1), a base (2), a gear drive module (3), a lead screw drive module (4), a telescopic rod (5) and an electric spark machining module (6); The truss (1) comprises a vertical frame (1.1) and a horizontal beam (1.2); the truss (1) is arranged on the base (2); the gear drive module (3) is arranged on the base (2), and the gear drive module (3) is located at the bottom of the truss (1); The lead screw drive module (4) is arranged on one side of the vertical frame (1.1); the two ends of the telescopic rod (5) are respectively hinged to the gear drive module (3) and the lead screw drive module (4); the side of the telescopic rod (5) close to the gear drive module (3) is connected to an electric spark machining module (6); The gear drive module (3) comprises a bracket (3.1), a guide frame (3.2), a gear guide groove (3.3), a guide wheel guide groove (3.4), a through hole (3.5), a gear (3.6), a gear drive motor (3.7), a gear ring (3.8), a guide wheel (3.9) and an adapter (3.10); The processing machine tool also includes a suspension support module (7); The suspension support module (7) comprises a second gear (7.1), a rack (7.2), a second telescopic rod (7.3), and a second gear drive mechanism (7.4); the rack (7.2) is arranged on the crossbeam (1.2); the second gear (7.1) is meshed with the rack (7.2); one end of the second telescopic rod (7.3) is connected to the adapter (3.10), and the other end is hinged to the second gear (7.1).

2. The electrospark compound machining machine tool according to claim 1, characterized in that: The guide frame (3.2) is detachably arranged on the bracket (3.1); the through hole (3.5) is arranged at the center of the guide frame (3.2); the gear guide groove (3.3) is arranged on the periphery of the through hole (3.5); the gear ring (3.8) is arranged on the periphery of the gear guide groove (3.3); the guide wheel guide groove (3.4) is integrally formed and arranged outside the guide frame (3.2); the gear (3.6) is meshed with the gear ring (3.8), the gear (3.6) is connected to the gear drive motor (3.7), and the guide wheel (3.9) is slidably arranged in the guide wheel guide groove (3.4); the gear (3.6) and the guide wheel (3.9) are respectively arranged on both sides of the adapter (3.10).

3. The electrospark compound machining machine tool according to claim 2, characterized in that: The lead screw drive module (4) comprises a lead screw drive motor (4.1), a lead screw (4.2), and a drive nut (4.3).

4. The electrospark compound machining machine tool according to claim 3, characterized in that: One side of the driving nut (4.3) is connected to a hinge seat (4.4), and the hinge seat (4.4) is connected to the telescopic rod (5) via a Hooke hinge.

5. The electrospark compound machining machine tool according to claim 3, characterized in that: The electric spark machining module (6) comprises a motor (6.1), a rotating seat (6.2), a second screw drive module (6.3), and a welding head (6.4); the motor (6.1) is arranged on the adapter (3.10); the rotating seat (6.2) is arranged on the rotating output end of the motor (6.1); and the welding head (6.4) is connected to the rotating seat (6.2) via the second screw drive module (6.3).

6. A working method of an EDM machine tool, applied to an EDM machine tool as claimed in claim 5, characterized in that: The steps include: 1) The EDM machine tool is assembled and the workpiece is arranged on a workbench; 2) The driving gear (3.6) moves to the processing point, and the telescopic rod (5) and the lead screw driving module (4) are adjusted to complete the support of the EDM module (6); 3) adjusting the rotating seat (6.2) of the electric spark machining module (6) so that the welding head (6.4) faces the welding point; and adjusting the distance between the welding head (6.4) and the welding point through the second screw drive module (6.3); 4) Connect the welding head electrode and the workpiece electrode, pulse discharge, and complete the welding of one point; 5) Continue to repeat steps 1)-4) to complete the operation of all welding points.

Images