A kind of electric spark compound machining machine tool and working method thereof

Abstract

The present invention discloses an electrospark machining center and a working method thereof, which relate to the field of welding, and include a truss, a base, a gear drive module, a screw drive module, a telescopic rod, and an electrospark machining module; the truss includes a vertical frame and a horizontal beam; the truss is arranged on the base; the gear drive module is arranged on the base, and the gear drive module is located at the lower part of the truss. The present invention overcomes the technical problem that the processing points of the existing electrospark machining center are limited, and provides a reliable solution for multi-angle electrospark machining. The electrospark machining center and the working method thereof adjust the processing points of the electrospark machining module through an adjustment mechanism in which the gear drive module, the screw drive module, and the telescopic rod cooperate with each other; by setting the workpiece in the internal through hole of the guide frame, the electrospark machining points can be arranged at any point on the outer peripheral surface of the workpiece, and each outer peripheral surface of the workpiece can be welded.

Description

Technical Field

[0001] The invention relates to the technical field related to welding, in particular to an electric spark composite machining machine tool and a working method thereof. Background Art

[0002] The EDM medium directly affects the efficiency, precision, surface quality and environmental protection of the processing technology. The EDM medium commonly used in industry mainly includes oil-based working fluid and water-based working fluid. The oil-based working fluid has high processing precision, but there is a fire hazard. Harmful gases will be released during the processing, and the carbon precipitated during the processing will affect the processing stability and efficiency; the water-based working fluid does not have a fire hazard, but there is electrolytic corrosion during the processing, which will seriously affect the processing precision and may corrode the machine tool. Furthermore, the oil bath and water bath limit the processing of workpieces at multiple angles; for this reason, the prior Chinese invention patent application number CN201710023496.8 proposed a technical means to improve the efficiency of EDM in atmospheric pressure cold plasma jet by adding a coaxial high-speed air jet; the prior Chinese invention patent application number CN201910139858.9 proposed a quasi-dry high-speed EDM method, using the mixture of atmospheric pressure cold plasma jet proposed by the invention patent number CN201610874299.2 and the coaxial spray jet proposed by the present invention as the EDM medium, and applying ultrasonic vibration to the workpiece at the same time; when working, 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, and the mixed medium 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 processed is completely submerged in the mixed medium, and will not interfere with the machine tool during processing. 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 processing feedback signal. After the processing is completed, the cold plasma jet and coaxial spray jet mixed medium generating device and the electric spark machining machine tool are turned off.

[0003] The present invention aims to study and propose a method that can be separated from an oil-based working fluid pool or a water-based working fluid pool based on the prior art, thereby overcoming the technical problem of limited machining points of an EDM machine tool and providing a reliable solution for multi-angle EDM machining. Summary of the invention

[0004] Based on the prior art, the present invention provides an electric spark compound machining machine tool and a working method thereof.

[0005] In order to solve the technical problem that the machining points of the above-mentioned EDM machine tool are limited, the present invention provides the following technical solutions: 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; 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; 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.

[0006] 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.

[0007] 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.

[0008] 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.

[0009] Particularly, one end of the telescopic rod is connected to the adapter.

[0010] As a preferred technical solution of the present invention, the screw drive module includes a screw drive motor, a screw, and a drive nut.

[0011] The driving nut sleeved on the lead screw performs reciprocating linear motion along the lead screw driven by the lead screw driving motor; and one end of the telescopic rod is hinged on the driving nut; as the lead screw reciprocates, one end of the telescopic rod performs swinging motion; the driving nut and the telescopic rod can provide suspension support or supporting support for the EDM module.

[0012] By adopting the above technical solution, when the gear is close to or located at the top of the gear ring, the drive nut can be driven to move to the lower part of the screw, and at this time, the telescopic rod provides abutment support for the electrospark machining module; when the gear is close to or located at the bottom of the gear ring, the drive nut can be driven to move to the upper part of the screw, and at this time, the telescopic rod provides suspension support for the electrospark machining module.

[0013] As a preferred technical solution of the present invention, one side of the driving nut is connected to an articulated seat, and the articulated seat is connected to the telescopic rod through a Hooke's hinge.

[0014] As a preferred technical solution of the present invention, the electrospark machining module includes a motor, a rotating seat, a second screw drive module, and a welding head; the motor is arranged on the adapter, and the rotating seat is arranged at the rotation output end of the motor; the welding head is connected to the rotating seat through the second screw drive module.

[0015] After the EDM module reaches the EDM point, the motor adjusts the angle of the welding head so that the welding head faces the workpiece. At this time, the second lead screw drive module adjusts the distance between the welding head and the workpiece, and the electrode pulse discharges to complete the EDM welding operation.

[0016] As a preferred technical solution of the present invention, the processing machine tool also includes a suspension support module, which includes a second gear, a rack, a second telescopic rod, and a second gear drive mechanism; the rack is arranged on the crossbeam; the second gear is meshed with the rack; one end of the second telescopic rod is connected to the adapter, and the other end is hinged to the second gear.

[0017] The support stability of the EDM module can be further increased by adding the second telescopic rod. Specifically, the support stability is improved by forming a triangular stable structure with the triangles formed by the telescopic rod and each end point of the second telescopic rod.

[0018] A working method of an electrospark composite machining machine tool comprises the following steps: 1) The EDM machine tool is assembled and the workpiece is placed on a workbench; 2) driving the gear to move to the processing point, adjusting the telescopic rod and the lead screw drive module to complete the support of the EDM module; 3) adjusting the rotating seat of the EDM module so that the welding head is directly opposite to the welding point; adjusting the distance between the welding head and the welding point by the second lead screw driving module; 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.

[0019] Among them, in step 2), the telescopic rod is configured with a corresponding first displacement sensor and pressure sensor, the screw drive module is provided with a second displacement sensor, and the gear drive motor is provided with a motor counter; the first displacement sensor, the second displacement sensor, the pressure sensor, and the motor counter are all connected to the data acquisition module; the data acquisition module is connected to the MPU (microprocessor); the microprocessor calculates and controls the EDM module to accurately move to the processing point.

[0020] In addition, in step 2), the processing points can be accurately controlled by using a CCD industrial camera.

[0021] In step 4), the welding head uses a mixture composed of coaxial spray jets as an EDM medium, and a vibrating element (such as a transducer) can be selectively provided to apply ultrasonic vibration to the workpiece.

[0022] In step 5), operations at different welding points can be achieved by moving the EDM module without moving the workpiece to adjust the EDM point.

[0023] The beneficial effects of the present invention are: This type of EDM composite machine tool and its working method adjust the processing points of the EDM module through an adjustment mechanism in which a gear drive module, a screw drive module, and a telescopic rod cooperate with each other. By setting the workpiece in a through hole inside a guide frame, the EDM processing points can be arranged at multiple points on the outer peripheral surface of the workpiece, and welding can be performed on multiple points on the outer peripheral surface of the workpiece.

[0024] The electrospark composite machining machine tool and the working method thereof, by adding a suspension support module, make the triangle formed by the telescopic rod and each end point of the second telescopic rod form a triangular stable structure to improve the support stability; thereby further improving the support stability of the electrospark machining module, and by arranging two groups of spark machining modules on both sides of the gear drive module, the possible electrospark machining points can be further expanded; thereby avoiding the problem of reduced welding point accuracy that may be caused by moving the workpiece and welding other points of the workpiece; and at the same time, the arrangement of the two groups of electrospark machining modules can further improve the machining efficiency.

[0025] The electrospark composite machining machine tool and the working method thereof avoid the problem of immersing the workpiece in an oil bath or a water bath and limiting the welding point by adopting a mixture composed of coaxial spray jets as an electrospark machining medium. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying 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 of the present invention. In the accompanying drawings: Figure 1 It is a first structural schematic diagram of an EDM machine tool of the present invention; Figure 2 It is a second structural schematic diagram of an EDM machine tool of the present invention; Figure 3 is a first schematic diagram of the transmission structure of the present invention; Figure 4 is a second schematic diagram of the transmission structure of the present invention; Figure 5 It is a structural schematic diagram of the adapter of the present invention; Figure 6 yes Figure 2 A partial enlarged view of the suspension support module in part A; Figure 7 It is a structural schematic diagram of the guide frame of the present invention; Figure 8 It is a structural schematic diagram of the EDM module of the present invention; Fig. 9 It is a structural diagram of embodiment 3 of the present invention.

[0027] In the figure: 1. Truss; 1.1. Vertical frame; 1.2. Crossbeam; 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. Gear ring; 3.9. Guide wheel; 3.10. Adapter; 4. Screw drive module; 4.1. Screw drive motor; 4.2. Screw; 4.3. Drive nut; 5. Telescopic rod; 6. EDM module; 6.1. Motor; 6.2. Rotating seat; 6.3. Second 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 DESCRIPTION

[0028] The preferred embodiments of the present invention are 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.

[0029] Embodiment 1: like Figure 1-Figure 9 As shown, the present invention seeks protection for an electrospark compound machining machine tool, comprising a truss 1, a base 2, a gear drive module 3, a screw drive module 4, a telescopic rod 5 and an electrospark 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 lower part of the truss 1; the screw drive module 4 is arranged on the vertical frame 1.1 of the truss 1; the two ends of the telescopic rod 5 are respectively hinged to the gear drive module 3 and the screw drive module 4; the telescopic rod 5 is connected to the electrospark machining module 6 on the side close to the gear drive module 3.

[0030] Among them, the screw drive module 4 and the gear drive module 3 cooperate with each other to adjust the position of the telescopic rod 5 in the vertical and horizontal directions, and adjust the position of the screw drive module 4 connected to one side of the telescopic rod 5 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 3; the specific arrangement method of the electrospark machining points will be elaborated in detail in the subsequent scheme.

[0031] Wherein, the gear driving module 3 comprises a bracket 3.1, a guide frame 3.2, a gear guiding groove 3.3, a guide wheel guiding groove 3.4, a through hole 3.5, a gear 3.6, a gear driving 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 guiding 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 guiding groove 3.3; the guide wheel guiding groove 3.4 is integrally formed on the outside of 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 driving motor 3.7, the guide wheel 3.9 is slidably arranged in the guide wheel guiding groove 3.4; the gear 3.6 and the guide wheel 3.9 are respectively arranged on both sides of the adapter 3.10.

[0032] 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 can allow the workpiece to be processed to pass through the guide frame 3.2, and the electrospark machining points arranged around the outer circumference of the gear driving module 3 can realize welding operations on specific points of the workpiece; the adjustment part of the electrospark machining points is carried out in the following manner: the gear 3.6 and the guide wheel 3.9 are respectively arranged on both sides of the adapter 3.10, the gear driving motor 3.7 drives the gear 3.6 to move on the gear ring 3.8, and 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 electrospark machining module 6 on the telescopic rod 5 also moves to a corresponding point accordingly.

[0033] In particular, one end of the telescopic rod 5 is hinged on the adapter 3.10.

[0034] The screw drive module 4 includes a screw drive motor 4.1, a screw 4.2, and a drive nut 4.3.

[0035] The driving nut 4.3 sleeved on the lead screw 4.2 performs reciprocating linear motion along the lead screw 4.2 driven by the lead screw driving motor 4.1; and one end of the telescopic rod 5 is hinged on the driving nut 4.3; as the lead screw 4.2 reciprocates, one end of the telescopic rod 5 performs a swinging motion; the driving nut 4.3 and the telescopic rod 5 can provide suspension support or supporting support for the EDM module 6.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] Embodiment 2: 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.

[0041] By adding the second telescopic rod 7.3, the support stability of the EDM 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.

[0042] Embodiment three: See also Fig. 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.

[0043] Embodiment 4: The method of use includes the following steps: 1) The EDM machine tool is assembled and the workpiece is placed on a workbench; 2) driving the gear 3.6 to move to the processing point, adjusting the telescopic rod 5 and the lead screw drive module 4 to complete the support of the EDM module 6; 3) adjusting the rotating seat 6.2 of the EDM module 6 so that the welding head 6.4 is directly opposite to the welding point; adjusting the distance between the welding head 6.4 and the welding point through the second lead screw driving 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.

[0044] Among them, in step 2), the telescopic rod is configured with a corresponding first displacement sensor and pressure sensor, the screw drive module is provided with a second displacement sensor, and the gear drive motor is provided with a motor counter; the first displacement sensor, the second displacement sensor, the pressure sensor, and the motor counter are all connected to the data acquisition module; the data acquisition module is connected to the MPU (microprocessor); the microprocessor calculates and controls the EDM module to accurately move to the processing point.

[0045] In addition, in step 2), the processing points can be accurately controlled by using a CCD industrial camera.

[0046] In step 4), the welding head uses a mixture composed of coaxial spray jets as an EDM medium, and a vibrating element (such as a transducer) can be selectively provided to apply ultrasonic vibration to the workpiece.

[0047] In step 5), operations at different welding points can be achieved by moving the EDM module without moving the workpiece to adjust the EDM point.

[0048] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, 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); and the side of the telescopic rod (5) close to the gear drive module (3) is connected to an electric spark machining module (6).

2. The electrospark compound machining machine tool according to claim 1, characterized in that: 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).

3. The electrospark compound machining machine tool according to claim 2, 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 bracket (3.1); 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).

4. The electrospark compound machining machine tool according to claim 3, 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).

5. The electrospark compound machining machine tool according to claim 4, 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's hinge.

6. The electrospark compound machining machine tool according to claim 4, 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).

7. The electrospark compound machining machine tool according to claim 6, characterized in that: The processing machine tool also includes a suspension support module (7).

8. The electrospark compound machining machine tool according to claim 7, characterized in that: 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).

9. A working method of an EDM machine tool, applied to an EDM machine tool according to any one of claims 1 to 8, characterized in that: The steps include: 1) The EDM machine tool is assembled and the workpiece is placed 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.

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