Wire cutting machine and method capable of automatically switching electrode wires

Abstract

The invention discloses a wire cutting machine capable of automatically switching electrode wires, which is provided with a wire passing channel for the electrode wires to automatically pass through, and comprises a first wire storage mechanism, a second wire storage mechanism and a third wire storage mechanism, the second wire storage mechanism is used for winding a second electrode wire; the clamping and conveying mechanism can clamp the electrode wires forwards or backwards, and the electrode wires comprise the first electrode wire and the second electrode wire; the switching mechanism can drive the first electrode wire or the second electrode wire to penetrate into the wire penetrating channel in a butt joint mode so that automatic wire penetrating and cutting can be achieved. The switching mechanism is used for achieving switching between the molybdenum wire and the copper wire, the molybdenum wire is used for primary roughing, the copper wire is used for secondary trimming, automatic wire penetrating and automatic cutting are combined, the two procedures are integrated on one device, automatic switching is achieved, the technological process is greatly simplified, the standby time is shortened, meanwhile, the characteristics and cost of the copper wire and the molybdenum wire are considered, and the production efficiency is improved. And the machining cost is reduced, the automation degree of equipment is greatly improved, and the machining efficiency is remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of wire cutting equipment, and in particular to a wire cutting machine and method for automatically switching electrode wires. Background Art

[0002] CNC wire cutting machines are usually divided into three categories: fast wire cutting machines, medium wire cutting machines and slow wire cutting machines; taking fast wire cutting machines as an example, the wire electrode makes high-speed reciprocating motion, and the wire speed is 8m / s~10m / s. Its working principle is: the wire electrode passes through the pre-drilled small hole on the workpiece, and moves back and forth alternately through the guide wheel driven by the wire drum. The workpiece is installed on the conductive workbench through the insulating plate. The conductive workbench moves in the horizontal plane X and Y coordinate directions according to the given control program to synthesize any plane curve trajectory. The pulse power supply applies a pulse voltage to the wire electrode and the workpiece, the wire electrode is connected to the negative pole of the pulse power supply, and the workpiece is connected to the positive pole of the pulse power supply. When an electric pulse comes, a spark discharge is generated between the wire electrode and the workpiece. The temperature in the center of the discharge channel can instantly reach more than 10,000°C. The high temperature melts the metal of the workpiece, and even a small amount of it is vaporized. The high temperature also vaporizes part of the working fluid between the wire electrode and the workpiece. The vaporized working fluid and metal vapor instantly expand rapidly and have the characteristics of explosion. This thermal expansion and local micro-explosion will throw out the melted and vaporized metal materials to achieve electro-erosion cutting of the workpiece material.

[0003] In actual processing scenarios, in order to balance processing efficiency and precision, medium-speed or high-speed wire cutting machines are often used for the first step of rough processing, and then slow-speed wire cutting machines are used for fine processing. Under the existing technical background, two machines and two processes are required to complete roughing and fine processing, which is inefficient and cumbersome to operate.

[0004] The utility model patent with the publication (announcement) number CN200960574Y discloses a reciprocating and unidirectional composite wire-cut EDM machine tool, which combines the advantages of two types of wire-cut EDM machines, but still fails to achieve automatic switching between two electrode wires, and is still relatively inconvenient to use. Summary of the invention

[0005] The main purpose of the present invention is to provide a wire cutting machine with automatic switching of electrode wires, and to realize automatic switching of electrode wires at the same time.

[0006] To achieve the above object, one aspect of the present invention provides a wire cutting machine for automatically switching electrode wires, having a wire threading channel for automatically threading the electrode wire, comprising:

[0007] A first wire storage mechanism, used for winding a first electrode wire;

[0008] A second wire storage mechanism, used for winding a second electrode wire;

[0009] A clamping and conveying mechanism, wherein the clamping and conveying mechanism can clamp and convey the electrode wire forward or backward, and the electrode wire includes the first electrode wire and the second electrode wire;

[0010] A switching mechanism, wherein the switching mechanism can drive the first electrode wire or the second electrode wire to be connected and inserted into the wire threading channel to realize automatic wire threading and cutting.

[0011] Furthermore, the switching mechanism includes a first switching channel and a second switching channel, and the first switching channel and the second switching channel can both be connected to the wire threading channel, the first electrode wire can pass through the first switching channel to pass through the wire threading channel, and the second electrode wire can pass through the second switching channel to pass through the wire threading channel.

[0012] Furthermore, the first switching channel and the second switching channel are connected to the wire threading channel from different positions and / or different angles.

[0013] Furthermore, the switching mechanism includes a translation driving component, and the translation driving component can drive the first switching channel or the second switching channel to translate and dock with the wire threading channel.

[0014] Furthermore, the switching mechanism comprises a clamping assembly, which can clamp the electrode wire to prevent it from falling off when it is not clamped by the clamping mechanism.

[0015] Furthermore, the clamping mechanism includes a first clamping assembly for clamping the first electrode wire and a second clamping assembly for clamping the second electrode wire.

[0016] Furthermore, the first wire storage mechanism includes a first wire reel and two or more guide members with circular cross-sections, the outer walls of the guide members are provided with limiting guide grooves capable of limiting the vertical translation space of the electrode wire, the widths of the limiting guide grooves of the two or more guide members gradually decrease, the outer wall of the first wire reel is wrapped around the first electrode wire, the first electrode wire is unwound from the first wire reel, and has a preset wire threading direction after passing through the limiting guide grooves with gradually decreasing widths.

[0017] Furthermore, a transfer piece is provided on one side of the second wire storage mechanism, and the second electrode wire can be connected to the second wire storage mechanism through the transfer piece to achieve automatic wire clamping.

[0018] Furthermore, the receiving piece is in the shape of a hollow tube, and the electrode wire can be passed through the receiving piece. The second wire storage mechanism includes a second wire reel and a second drive motor for driving the second wire reel to rotate. The receiving piece is arranged on one side of the second wire reel, and the other side of the second wire reel is provided with a wire connecting mechanism for receiving the first electrode wire. The wire connecting mechanism includes a wire connecting tube for docking with the receiving piece, and the wire connecting tube extends to one side of the second wire reel and is provided with a wire connecting end portion. A cutout is provided on the upper side of the wire connecting end portion to avoid the outer wall of the second wire reel, and a lower edge of the wire connecting end portion extends to one side of the receiving piece. The first electrode wire can be docked and passed through the receiving piece to the wire connecting tube.

[0019] Furthermore, the wire connecting mechanism includes a third clamping and feeding assembly arranged on one side of the wire outlet of the wire connecting tube, the first wire storage mechanism is connected to a first driving motor for controlling its unwinding, and a tension mechanism for detecting and / or adjusting its tension is provided on the wire threading path of the first electrode wire.

[0020] Preferably, the first electrode wire is a copper wire, a molybdenum wire, or a galvanized wire, and the second electrode wire is a molybdenum wire or a galvanized wire.

[0021] Another aspect of the present invention provides an automatic switching method for electrode wires, the wire cutting machine comprising the following steps:

[0022] S1. During rough machining, the switching mechanism drives the second electrode wire to be butted and inserted into the wire threading channel, and the second electrode wire reciprocates under the action of the second wire storage mechanism to cut the workpiece;

[0023] S2, during fine machining, the second electrode wire retreats to a preset position and waits, the switching mechanism drives the first electrode wire to butt and penetrate into the wire-threading channel, and the first electrode wire moves unidirectionally to cut the workpiece;

[0024] S3. After finishing, the first electrode wire is cut off at a designated position and its wire head is placed at a preset position for standby.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The switching mechanism is used to realize the switching between the first electrode wire and the second electrode wire, and combined with automatic wire threading and automatic cutting, which greatly improves the automation degree of the equipment and significantly improves the processing efficiency;

[0027] 2. The second electrode wire can be made of molybdenum wire for the initial roughing, and the first electrode wire can be made of copper wire for the secondary trimming. The two processes are integrated into one device and automatic switching is achieved, which greatly simplifies the process flow and reduces the standby time. At the same time, the characteristics and costs of copper wire and molybdenum wire are taken into account, thereby reducing the processing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0029] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0030] Figure 2 This is a schematic diagram of a switching mechanism according to Embodiment 1 of the present invention;

[0031] Figure 3 This is a schematic diagram of the connection between the transfer member and the wire connection mechanism in Example 1 of the present invention;

[0032] Figure 4 This is a schematic diagram of the docking of the switching mechanism of Example 2 of the present invention;

[0033] Figure 5 This is a schematic diagram of the docking of the switching mechanism according to embodiment 3 of the present invention.

[0034] Explanation of the accompanying drawings: 1-copper wire; 2-molybdenum wire; 3-mounting plate; 4-first wire reel; 5-guide member; 6-limiting guide groove; 7-first switching channel; 8-second switching channel; 9-clamping assembly; 10-clamping mechanism; 11-upper wire threading mechanism; 12-first steering unit; 13-workpiece; 14-lower wire threading mechanism; 15-second steering mechanism; 16-receiving member; 17-second wire reel; 18-second driving motor; 19-wire connecting tube; 20-incision; 21-first clamping assembly; 22-second clamping assembly; 23-third clamping assembly. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0037] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0038] Example 1: Reference Figures 1 to 3 A wire cutting machine for automatically switching electrode wires, comprising a first wire storage mechanism for winding a first electrode wire, a second wire storage mechanism for winding a second electrode wire, an upper wire threading mechanism 11, a lower wire threading mechanism 12, a clamping mechanism 10 (in this embodiment, the specific structure of the clamping mechanism refers to the "clamping mechanism" in the invention patent with the publication (announcement) number CN116252009B) and a switching mechanism. In this embodiment, the first electrode wire is a copper wire 1, the second electrode wire is a molybdenum wire 2, the first wire storage mechanism is used for unwinding the copper wire 1, and the second wire storage mechanism is used for winding and unwinding the molybdenum wire 2. The first wire storage mechanism includes a mounting plate 3, a second wire storage mechanism 14, a second wire storage mechanism 15, a second wire storage mechanism 16, a second wire storage mechanism 17, a second wire storage mechanism 18, a first wire storage mechanism 19, a second wire storage mechanism 20, a second wire storage mechanism 21, a first wire storage mechanism 22, a second wire storage mechanism 23, a first wire storage mechanism 24, a second wire storage mechanism 25, a first wire storage mechanism 26, a second wire storage mechanism 27, a first wire storage mechanism 28, a second wire storage mechanism 29, a first wire storage mechanism 20, a second wire storage mechanism 21, a first wire storage mechanism 24, a second wire storage mechanism 25, a second wire storage mechanism 26, a first wire storage mechanism 27, a second wire storage mechanism 28, a first wire storage mechanism 29, a first wire storage mechanism 20, a second wire storage mechanism 21, a second wire storage mechanism 22, a first wire storage mechanism 24, a first wire storage mechanism 25, a second wire storage mechanism 26, a second wire storage mechanism 27, a first wire storage mechanism 28, a first wire storage mechanism 29, a first wire storage mechanism 20, a second wire storage mechanism A wire drum 4 and two or more guide members 5 with circular cross-sections. This embodiment has four guide members 5. The first wire drum 4 and the guide members 5 are both rotatably connected to the same side end face of the mounting plate 3. The first wire drum 4 is arranged in the middle of the mounting plate 3. The four guide members 5 are evenly distributed on the outer periphery of the first wire drum 4 along the circumference. The outer wall of the guide member 5 is concavely provided with a limiting guide groove 6 for limiting the vertical translation space of the electrode wire. The center lines of the limiting guide grooves 6 of the four guide members 5 are located in the same plane and the width of the limiting guide grooves 6 gradually decreases. The copper wire 1 is unwound from the first wire drum 4 and has a preset threading direction after passing through the limiting guide grooves 6 with gradually decreasing widths. Since the position of the copper wire 1 will change with the change of the unwinding position when the copper wire 1 is unwound, by setting the limiting guide grooves 6 with gradually decreasing widths, the copper wire 1 can be gradually guided, so that the copper wire 1 has a uniform direction and position after being gradually limited by a number of guide members 5, ensuring normal threading and cutting. At the same time, the four guide members 5 are evenly distributed on the outer periphery of the first wire drum 4 along the circumference, which can fully utilize the position space and avoid the overall length of the wire cutting machine being too long.

[0039] Specifically, the switching mechanism includes a first switching channel 7 and a second switching channel 8. Both the first switching channel 7 and the second switching channel 8 can be connected to the wire threading channel. The copper wire 1 can pass through the first switching channel 7 to pass through the wire threading channel, and the second electrode wire can pass through the second switching channel 8 to pass through the wire threading channel. In this embodiment, the switching mechanism includes a translation drive component (not shown in the figure) and a clamping component 9. The translation drive component can drive the first switching channel 7 or the second switching channel 8 to translate and connect to the wire threading channel. In the rough machining program, the switching mechanism drives the second switching channel 8 It is translated and docked to the wire threading channel, and the clamping mechanism 10 clamps the molybdenum wire 2 forward so that the wire head is inserted into the wire threading channel of the upper wire threading mechanism 11, thereby realizing automatic wire threading, automatic wire removal and automatic cutting; when entering the finishing program, the clamping mechanism 10 clamps the molybdenum wire 2 backward so that the wire head is retracted into the second switching channel 8, and at the same time the clamping assembly 9 clamps the molybdenum wire 2, and the translation driving assembly drives the first switching channel 7 to translate and dock to the wire threading channel, and the clamping mechanism 10 clamps the copper wire 1 forward so that the wire head is inserted into the wire threading channel of the upper wire threading mechanism 11, thereby realizing automatic wire threading and automatic cutting.

[0040] The upper wire threading mechanism 11 includes a first steering unit 12. After the electrode wire enters the first steering unit 12, it can be turned at a preset angle, turning the originally horizontal electrode wire downward and entering the lower wire threading mechanism 14 through the processing hole of the workpiece 13. The lower wire threading mechanism 14 includes a second steering mechanism 15. After the electrode wire enters the second steering unit, it can be turned at a preset angle, turning the electrode wire to the side of the second wire storage mechanism and entering the receiving piece 16.

[0041] Specifically, it also includes a lifting drive mechanism, which can drive the upper wire threading mechanism 11 and / or the lower wire threading mechanism 14 to rise and fall to achieve docking or separation between the two. During docking, the upper wire threading mechanism 11 docks above the processing hole of the workpiece 13, and the lower wire threading mechanism 14 docks below the processing hole of the workpiece 13 (or the upper wire threading mechanism 11 directly penetrates the processing hole of the workpiece 13 and docks with the lower wire threading mechanism 14), forming a channel that can automatically thread the wire, thereby realizing automatic threading of the electrode wire.

[0042] The second wire storage mechanism includes a second wire reel 17 and a second driving motor 18 for driving the second wire reel 17 to rotate. The outer wall of the second wire reel 17 is provided with a clamping assembly for clamping the wire head of the molybdenum wire 2 (not shown in the figure, the detailed structure can refer to the utility model patent with the publication (announcement) number CN220330176U). A receiving piece 16 is provided on one side of the second wire reel 17. The receiving piece 16 of this embodiment is a hollow tubular receiving piece 16, which can be passed through the electrode wire. The receiving piece 16 can be translated and docked to the clamping assembly, so that the wire head of the molybdenum wire 2 can be clamped and fixed by the clamping assembly after passing through the receiving piece 16, and is wound around the second wire reel 17 as the second wire reel 17 rotates. When the receiving member 16 translates and acts close to the clamping assembly, the wire outlet of the receiving member 16 is located at the lower edge of one side of the second wire reel 17, and a wire connecting mechanism for receiving the copper wire 1 is provided on the other side of the second wire reel 17. The wire connecting mechanism includes a wire connecting tube 19 for docking with the receiving member 16, and a wire connecting end is provided at one end of the wire connecting tube 19 close to the second wire reel 17. A cutout 20 is provided on the upper side of the wire connecting end to avoid the outer wall of the second wire reel 17, and the lower edge of the wire connecting end extends to below the wire outlet of the receiving member 16. In this embodiment, when the molybdenum wire 2 is connected to the clamping assembly by using the receiving member 16, it is necessary to act on the clamping assembly to make it open, and the wire head of the molybdenum wire 2 enters the clamping assembly and is clamped and fixed; and when the copper wire 1 is connected to the wire connecting tube 19 by using the receiving member 16, the receiving member 16 does not need to act on the clamping assembly, that is, when the receiving member 16 is connected and inserted into the molybdenum wire 2 and the copper wire 1, it is necessary to control the receiving member 16 to move in different distances, so that the molybdenum wire 2 can be connected to the second wire tube 17, and the copper wire 1 can be connected to the wire connecting tube 19 (as an alternative, the receiving member 16 The amount of translation can also remain unchanged by controlling the rotation of the second wire tube 17, so that when the receiving piece 16 is docked and threading the copper wire 1, the clamping assembly on the second wire tube 17 leaves the position of docking and clamping the molybdenum wire 2. In this way, when the copper wire 1 is docked and threading, the receiving piece 16 will not directly act on the clamping assembly during translation, but will be located above the end of the connecting wire. After the wire head of the copper wire 1 passes through the receiving piece 16, it will enter the wire connecting tube 19 from the end of the connecting wire to complete the threading of the copper wire 1. In short, structurally, only one receiving piece 16 is needed to respectively realize the delivery of the copper wire 1 and the molybdenum wire 2).

[0043] It also includes a cutting mechanism (not shown in the figure). After finishing, before switching to the next round of rough processing, the cutting mechanism is used to cut the copper wire 1 at a specified position and make its wire head standby at a preset position, so as to recycle the cut copper wire 1. The wire connecting mechanism includes a third clamping assembly 23 arranged on one side of the wire outlet of the wire connecting tube 19 (in this embodiment, the specific structure of the third clamping assembly 23 refers to the "clamping mechanism" in the invention patent with the disclosure (announcement) number CN116252009B), the first wire storage mechanism is connected to a first drive motor that controls the speed and / or torque of its unwinding, and a tension mechanism (not shown in the figure) for detecting and / or adjusting the tension of the copper wire 1 is provided on the wire threading path of the copper wire 1. When cutting, the third clamping assembly 23 cooperates with the first drive motor to transfer the copper wire 1, and the tension adjustment mechanism keeps the tension of the copper wire 1 within a preset range when cutting. In this embodiment, the cutting mechanism is arranged at the wire outlet of the third clamping assembly. After completing a fine processing, the copper wire 1 can be cut and the wire head can be returned to the first switching channel 7 for standby, and the cut copper wire 1 can be recycled at the same time.

[0044] A wire storage amount dynamic adjustment mechanism is also provided on the wire threading path of the second electrode wire, which is used to obtain the difference between the winding and unwinding speed of the second wire reel 17 and the actual speed at which the electrode wire is clamped by the clamping unit, and adjust the speed of the second wire reel 17 and / or the clamping unit to keep the molybdenum wire 2 reserve on the wire storage amount dynamic adjustment mechanism within a preset range. The specific structure and working principle refer to a dynamic adjustment device for a wire electrode disclosed in the utility model patent with application number CN202320781746.5.

[0045] The working principle of this embodiment is as follows:

[0046] Preliminary preparation: the copper wire 1 is unwound from the first wire drum 4, and after passing through the limiting guide groove 6 with gradually decreasing width, it has a preset wire threading direction. The wire head of the copper wire 1 enters the first switching channel 7 and is clamped by the clamping assembly 9; the molybdenum wire 2 is unwound from the second wire drum 17, and after passing through the dynamic adjustment mechanism of the wire storage amount, the wire head of the molybdenum wire 2 enters the second switching channel 8 and is clamped by the clamping assembly 9.

[0047] Rough machining: The translational drive component can drive the second switching channel 8 to translate and dock to the wire threading channel, and the clamping mechanism 10 clamps the molybdenum wire 2 forward, so that the wire head of the molybdenum wire 2 passes through the upper wire threading mechanism 11, and the upper wire threading mechanism 11 and / or the lower wire threading mechanism 14 are raised and lowered, respectively docking with the processing hole of the workpiece 13 from the upper and lower sides to form a wire threading channel, and the molybdenum wire 2 passes from the upper wire threading mechanism 11 through the processing hole of the workpiece 13 to the lower wire threading mechanism 14, and enters the receiving member 16, and the receiving member 16 moves and docks to the clamping component of the second wire reel 17, and the wire head of the molybdenum wire 2 passes through the clamping component and is clamped and fixed by it to complete automatic wire threading, then, the clamping mechanism 10 releases the clamping of the molybdenum wire 2, and under the driving action of the second drive motor 18, the second wire reel 17 rotates forward or reversely, so that the molybdenum wire 2 moves back and forth to cut the workpiece 13, completing the rough machining cutting of the hole of the workpiece 13.

[0048] Finishing: The translation drive assembly can drive the first switching channel 7 to translate and dock to the wire threading channel, and the clamping mechanism 10 clamps the copper wire 1 forward, so that the wire head of the copper wire 1 passes through the upper wire threading mechanism 11, and the upper wire threading mechanism 11 and / or the lower wire threading mechanism 14 are lifted and lowered, respectively docking with the processing hole of the workpiece 13 from the upper and lower sides to form a wire threading channel, and the copper wire 1 passes from the upper wire threading mechanism 11 through the processing hole of the workpiece 13 to the lower wire threading mechanism 14, and the receiving member 16 translates to dock with the wire end of the wire tube 19, and the copper wire 1 passes from the receiving member 16 into the wire tube 19, and finally passes out from the wire outlet at the other end of the wire tube 19. After finishing, before switching to the next round of rough processing, the cutting mechanism is used to cut the copper wire 1 at the specified position and return its wire head to the first wire cutting channel, and the cut copper wire 1 is recovered at the same time.

[0049] The beneficial effects of this embodiment are as follows:

[0050] 1. The switching mechanism is used to switch between molybdenum wire 2 and copper wire 1. Molybdenum wire 2 is used for the initial roughing, and copper wire 1 is used for the secondary trimming. Combined with automatic wire threading and automatic cutting, the two processes are integrated into one device, and automatic switching is achieved, which greatly simplifies the process flow and reduces the standby time. At the same time, the characteristics and costs of copper wire 1 and molybdenum wire 2 are taken into account, the processing cost is reduced, the degree of automation of the equipment is greatly improved, and the processing efficiency is significantly improved;

[0051] 2. By setting the limiting guide groove with gradually decreasing width, the copper wire 1 can be gradually guided, so that the copper wire 1 has a unified direction and position after being gradually limited by several guide members, ensuring normal wire threading and cutting. At the same time, the four guide members are evenly distributed on the outer periphery of the first wire drum along the circumference, which can make full use of the position space and avoid the overall length of the wire cutting machine being too long;

[0052] 3. The transfer member 16 can connect the molybdenum wire 2 to the second wire tube 17 and the copper wire 1 to the wire connecting tube 19. The structure is scientific and reasonable, simple and reliable. It can realize its function and reduce the cost, and has a very high cost performance.

[0053] Example 2: Reference Figure 4 The difference between this embodiment and Example 1 is that, at the switching mechanism, the clamping mechanism includes a first clamping assembly 21 for clamping the copper wire 1 and a second clamping assembly 22 for clamping the molybdenum wire 2, and the clamping assembly is omitted. When the copper wire 1 is connected to the wire threading channel of the first reversing unit 12 through the first switching channel 7, the first clamping assembly 21 clamps the copper wire 1, and the second clamping assembly 22 clamps the molybdenum wire 2 to prevent it from falling off. Similarly, when the second switching channel 8 of the molybdenum wire 2 is connected to the wire threading channel of the first reversing unit 12, the second clamping assembly 22 clamps the molybdenum wire 2, and the first clamping assembly 21 clamps the copper wire 1 to prevent it from falling off.

[0054] Example 3: Reference Figure 5 The difference between this embodiment and Example 2 is that the translation drive component is omitted, the first switching channel 7 and the second switching channel 8 are fixedly arranged, and are connected to the wire threading channel from different positions and different angles. During rough processing, under the clamping action of the first clamping and feeding component 21, the wire head of the copper wire 1 is placed in the first switching channel 7 on standby, and the molybdenum wire 2 is passed from the second switching channel 8 to the wire threading channel of the first reversing unit 12 under the clamping action of the second clamping and feeding component 22, and automatic wire threading, wire removal and cutting are realized; during fine processing, under the clamping action of the second clamping and feeding component 22, the wire head of the molybdenum wire 2 retracts into the second switching channel 8, and the copper wire 1 is passed from the first switching channel 7 to the wire threading channel of the first reversing unit 12 under the clamping action of the first clamping and feeding component 21, and automatic wire threading and cutting are realized.

[0055] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A wire cutting machine with automatic switching of electrode wires, having a wire threading channel for automatic threading of electrode wires, characterized in that: include: A first wire storage mechanism, used for winding a first electrode wire; A second wire storage mechanism, used for winding a second electrode wire; A clamping and conveying mechanism, wherein the clamping and conveying mechanism can clamp and convey the electrode wire forward or backward, and the electrode wire includes the first electrode wire and the second electrode wire; A switching mechanism, wherein the switching mechanism can drive the first electrode wire or the second electrode wire to be connected and inserted into the wire threading channel to realize automatic wire threading and cutting.

2. The wire cutting machine with automatic switching of electrode wires according to claim 1, characterized in that: The switching mechanism includes a first switching channel and a second switching channel. The first switching channel and the second switching channel can both be connected to the wire threading channel. The first electrode wire can pass through the first switching channel to pass through the wire threading channel. The second electrode wire can pass through the second switching channel to pass through the wire threading channel.

3. The wire cutting machine with automatic switching of electrode wires according to claim 2, characterized in that: The first switching channel and the second switching channel are connected to the wire threading channel from different positions and / or different angles.

4. The wire cutting machine with automatic switching of electrode wires according to claim 2, characterized in that: The switching mechanism includes a translation driving component, and the translation driving component can drive the first switching channel or the second switching channel to translate and dock with the wire threading channel.

5. The wire cutting machine with automatic switching of electrode wires according to claim 4, characterized in that: The switching mechanism comprises a clamping assembly, which can clamp the electrode wire to prevent it from falling off when it is not clamped by the clamping mechanism.

6. The wire cutting machine with automatic switching of electrode wires according to claim 1, characterized in that: The clamping mechanism comprises a first clamping assembly for clamping the first electrode wire and a second clamping assembly for clamping the second electrode wire.

7. The wire cutting machine with automatic switching of electrode wires according to claim 1, characterized in that: The first wire storage mechanism includes a first wire drum and two or more guide members with circular cross-sections. The outer walls of the guide members are provided with limiting guide grooves that can limit the vertical translation space of the electrode wire. The widths of the limiting guide grooves of the two or more guide members gradually decrease. The outer wall of the first wire drum is wound around the first electrode wire. The first electrode wire is unwound from the first wire drum and has a preset wire threading direction after passing through the limiting guide grooves with gradually decreasing widths.

8. The wire cutting machine with automatic switching of electrode wires according to claim 1, characterized in that: A transfer piece is provided on one side of the second wire storage mechanism, and the second electrode wire can be connected to the second wire storage mechanism through the transfer piece to achieve automatic wire clamping.

9. The wire cutting machine with automatic switching of electrode wires according to claim 8, characterized in that: The receiving piece is in the shape of a hollow tube, and the electrode wire can be passed through the receiving piece. The second wire storage mechanism includes a second wire drum and a second drive motor that drives the second wire drum to rotate. The receiving piece is arranged on one side of the second wire drum, and the other side of the second wire drum is provided with a wire connecting mechanism for receiving the first electrode wire. The wire connecting mechanism includes a wire connecting tube for docking with the receiving piece, and the wire connecting tube extends to one side of the second wire drum and is provided with a wire connecting end portion. A cutout is provided on the upper side of the wire connecting end portion to avoid the outer wall of the second wire drum, and a lower edge of the wire connecting end portion extends to one side of the receiving piece. The first electrode wire can be docked and passed through the receiving piece to the wire connecting tube.

10. The wire cutting machine with automatic switching of electrode wires according to claim 9, characterized in that: The wire connecting mechanism includes a third clamping and feeding assembly arranged on one side of the wire outlet of the wire connecting tube, the first wire storage mechanism is connected to a first driving motor for controlling its unwinding, and a tension mechanism for detecting and / or adjusting its tension is provided on the wire threading path of the first electrode wire.

11. The wire cutting machine with automatic switching of electrode wires according to claim 1, characterized in that: The first electrode wire is a copper wire, a molybdenum wire, or a galvanized wire, and the second electrode wire is a molybdenum wire or a galvanized wire.

12. An automatic switching method for electrode wires, used in the wire cutting machine according to any one of claims 1 to 11, characterized in that: The following steps are involved: S1. During rough machining, the switching mechanism drives the second electrode wire to be butted and inserted into the wire threading channel, and the second electrode wire reciprocates under the action of the second wire storage mechanism to cut the workpiece; S2. During fine machining, the second electrode wire retreats to a preset position and waits for operation. The switching mechanism drives the first electrode wire to be butted and threaded into the threading channel. The first electrode wire moves in one direction to cut the workpiece. S3. After finishing, the first electrode wire is cut at a designated position and its wire head is placed at a preset position for standby.

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