An automatic wire threading mechanism of a slow wire cutting machine tool
By designing an automatic wire threading mechanism, the electrode wire is driven through the lead hole by water flow, which solves the problem of deionized water affecting wire threading, realizes stable processing in deionized water, and ensures processing accuracy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TAIZHOU ZHUDING NEW MATERIAL MFG CO LTD
- Filing Date
- 2025-06-30
- Publication Date
- 2026-07-07
AI Technical Summary
In slow wire EDM, the presence of deionized water affects the wire threading process, making it difficult to guarantee machining accuracy.
Design an automatic wire threading mechanism including an upper wire threading mechanism, a lower wire threading mechanism, and an electrode wire guiding assembly. Utilize the annular water outlet and wire hole on the guide head to drive the electrode wire to stably pass through the lead hole of the workpiece through water flow. Combined with the hydraulic cylinder drive and the sealing performance of the rubber block, the stability of wire threading in deionized water is achieved.
This technology enables efficient and stable electrode wire threading through the workpiece lead hole in deionized water, ensuring machining accuracy and reliable wire threading.
Smart Images
Figure CN224463858U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wire EDM machine tool technology, and in particular to an automatic wire threading mechanism for a slow wire EDM machine tool. Background Technology
[0002] Wire EDM is a common machining method. Among them, slow wire EDM has the highest machining precision. When the part to be machined on the workpiece is located at the center, a lead hole is usually machined at the center of the workpiece, and then the wire is threaded to achieve machining from the center of the workpiece.
[0003] In existing technologies, to ensure machining accuracy during wire EDM, the workpiece is submerged in deionized water. The deionized water needs to flow to promptly flush away metal particles generated during machining, preventing secondary discharge and thus ensuring machining accuracy. However, the presence of deionized water can interfere with the wire threading process. Utility Model Content
[0004] The purpose of this invention is to provide an automatic wire threading mechanism for a slow wire EDM machine, which can stably guide the electrode wire through the lead hole on the workpiece when the workpiece is submerged in deionized water.
[0005] This utility model provides an automatic wire threading mechanism for a slow wire EDM machine, comprising:
[0006] The upper wire threading mechanism and the lower wire threading mechanism are provided, wherein the guide nozzle of the upper wire threading mechanism leads out the electrode wire, and the guide nozzle of the lower wire threading mechanism receives the electrode wire.
[0007] An electrode wire guiding assembly includes a guiding head and a driving device. The guiding head is located directly below the wire guide nozzle of the upper wire threading mechanism. The driving device drives the guiding head to move up and down. A wire hole is provided in the center of the guiding head, and an annular water outlet is provided on the bottom surface of the guiding head. The wire hole is located in the center of the annular water outlet.
[0008] The guide head moves upward until the electrode wire led out by the upper wire threading mechanism extends into the wire hole. The guide head and the electrode wire move downward synchronously until the annular water outlet is pressed against the lead hole of the workpiece. Water from the annular water outlet drives the electrode wire through the lead hole of the workpiece.
[0009] Preferably, the electrode wire guiding assembly further includes a rubber block, which is fixedly connected to the guiding head. When the guiding head moves downward, the rubber block replaces the bottom surface of the guiding head and abuts against the workpiece.
[0010] Preferably, the rubber block is cylindrical and sleeved on the guide head, and the vertical height of the bottom surface of the rubber block is lower than the vertical height of the bottom surface of the guide head.
[0011] Preferably, the driving device is a hydraulic cylinder, the driving end of the driving device is fixedly connected to the guide head, and the driving device is fixedly connected to the upper threading mechanism.
[0012] Preferably, the driving device includes two hydraulic cylinders that move synchronously, and the two hydraulic cylinders are respectively disposed on both sides of the guide head.
[0013] Preferably, the vertical height of the outer ring sidewall of the annular outlet is lower than the vertical height of the inner ring sidewall of the annular outlet.
[0014] Preferably, the guide head is provided with a water inlet, through which water is supplied to the guide head.
[0015] Preferably, the guide head has two water inlets, which are symmetrically arranged on the side walls on both sides of the guide head.
[0016] Preferably, the automatic wire threading mechanism of the slow wire EDM machine tool further includes a water supply pump, the water outlet of which is connected to the water inlet.
[0017] Preferably, the diameter of the wire hole is between 1 mm and 2 mm.
[0018] The technical solution of this utility model guides the electrode wire drawn from the upper wire threading mechanism to approach the lower wire threading mechanism through the electrode wire guiding assembly. The water flow from the annular outlet on the guide head drives the lower end of the electrode wire in the wire hole to move downward. After the annular outlet is pressed onto the lead wire hole of the workpiece, the water flow from the annular outlet will flow through the lead wire hole of the workpiece, stably driving the lower end of the electrode wire to pass through the lead wire hole of the workpiece. Attached Figure Description
[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0020] Figure 1 This is a front view of the automatic wire threading mechanism of a slow wire EDM machine according to the present invention;
[0021] Figure 2 This is a side view of the automatic wire threading mechanism of a slow wire EDM machine according to the present invention;
[0022] Figure 3 for Figure 2 Assembly diagram of the electrode wire guiding assembly in the automatic wire threading mechanism of a medium-slow wire EDM machine;
[0023] Figure 4 for Figure 1 A cross-sectional view of the guide head in the automatic wire threading mechanism of a medium-slow wire EDM machine;
[0024] Figure 5 for Figure 2 Assembly diagram of the guide head in the automatic wire threading mechanism of a medium-slow wire EDM machine.
[0025] Explanation of reference numerals in the attached figures:
[0026] 1. Upper wire threading mechanism; 2. Lower wire threading mechanism; 3. Electrode wire guiding assembly; 31. Guide head; 311. Guide hole; 312. Annular water outlet; 313. Water inlet; 32. Drive device; 33. Rubber block; 34. Water supply pump; A. Workpiece; B. Electrode wire. Detailed Implementation
[0027] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0028] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0029] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0030] Combination Figures 1 to 5 As shown, the automatic wire threading mechanism of a slow wire EDM machine tool provided by this utility model includes an upper wire threading mechanism 1, a lower wire threading mechanism 2, and an electrode wire guiding assembly 3.
[0031] Combination Figures 1 to 5 As shown, the guide nozzle of the upper wire threading mechanism 1 leads out the electrode wire, and the guide nozzle of the lower wire threading mechanism 2 receives the electrode wire; the upper wire threading mechanism 1 includes an upper conductive block, an upper guide wheel, a wire spool and other structures, and the lower wire threading mechanism 2 includes a lower conductive block, a lower guide wheel, a waste wire basket and other structures.
[0032] The electrode wire guiding assembly 3 includes a guiding head 31 and a driving device 32. The guiding head 31 is located directly below the wire guide nozzle of the upper wire threading mechanism 1. The driving device 32 drives the guiding head 31 to move up and down. The guiding head 31 has a wire hole 311, an annular water outlet 312 and a water inlet 313. The wire hole 311 is located at the center of the guiding head 31. The annular water outlet 312 is provided on the bottom surface of the guiding head 31. The wire hole 311 is located at the center of the annular water outlet 312.
[0033] A height difference can be provided between the outer and inner sidewalls of the annular outlet 312, so that the vertical height of the outer sidewall of the annular outlet 312 is lower than the vertical height of the inner sidewall of the annular outlet 312. The shorter inner sidewall allows the annular water flow discharged from the annular outlet 312 to be better collected at the location of the electrode wire.
[0034] The water inlet 313 is connected to the outlet of the water supply pump 34. The water supply pump 34 supplies water to the guide head 31 through the water inlet 313. The water supply pump 34 is placed on the worktable of the wire cutting machine tool and submerged in deionized water.
[0035] Working process: In the initial state, the guide head 31 is at a high position. At this time, the wire hole 311 on the guide head 31 is connected to the wire guide nozzle of the upper wire threading mechanism 1, and the electrode wire led out by the upper wire threading mechanism 1 naturally enters the wire hole 311.
[0036] Water begins to flow from the annular outlet 312 of the guide head 31. The water flow gathers directly below the wire hole 311 and impacts the lower end of the electrode wire downwards. The guide head 31 and the lower end of the electrode wire move downwards synchronously until the annular outlet 312 is pressed against the lead hole of the workpiece. During this period, the annular outlet 312 continues to flow water downwards and impacts the lower end of the electrode wire.
[0037] After the annular water outlet 312 is pressed onto the lead wire hole of the workpiece, the guide head 31 stops moving downward, but the electrode wire continues to extend downward. The water flow from the annular water outlet 312 will naturally flow into the lead wire hole of the workpiece, driving the electrode wire through the lead wire hole of the workpiece. Finally, the wire threading mechanism 2 receives the electrode wire from below the workpiece, and the guide head 31 moves upward and resets.
[0038] In this embodiment, the electrode wire guided by the electrode wire guide assembly 3 is brought closer to the lower wire threading mechanism 2 by the electrode wire guide assembly 3. The water flow from the annular outlet 312 on the guide head 31 drives the lower end of the electrode wire in the wire hole 311 to move downward. After the annular outlet 312 is pressed against the lead hole of the workpiece, the water flow from the annular outlet 312 will flow through the lead hole of the workpiece, stably driving the lower end of the electrode wire to pass through the lead hole of the workpiece. Even if the workpiece is immersed in deionized water, wire threading can still be performed efficiently and stably.
[0039] In this embodiment, the electrode wire used in slow wire EDM is usually brass wire or galvanized copper wire, with a diameter generally between 0.1mm and 0.3mm. To avoid the electrode wire rubbing against the inner wall of the wire hole 311 and to improve the wire threading error tolerance, the diameter of the wire hole 311 is generally controlled between 1mm and 2mm. The common size of the lead hole on the workpiece is between 2mm and 8mm, and the outer diameter of the annular water outlet 312 is generally not less than 8mm, to ensure that the water flowing into the lead hole can achieve a better traction effect.
[0040] In some embodiments, combined with Figures 3 to 5As shown, the electrode wire guiding assembly 3 also includes a rubber block 33, which is fixedly connected to the guiding head 31. When the guiding head 31 moves downward, the rubber block 33 replaces the bottom surface of the guiding head 31 and abuts against the workpiece. The deformation capacity of the rubber itself allows it to better conform to the top surface of different workpieces, and the sealing capacity of the rubber itself can effectively control water overflow from affecting the guiding effect. The rubber block 33 is cylindrical and sleeved on the guiding head 31. The vertical height of the bottom surface of the rubber block 33 is lower than the vertical height of the bottom surface of the guiding head 31, so that the annular rubber block 33 can be pressed against the lead hole of the workpiece, better connecting the wire hole 311 and the lead hole on the workpiece.
[0041] In some embodiments, combined with Figure 4 As shown, the guide head 31 has two water inlets 313, which are symmetrically arranged on the side walls on both sides of the guide head 31. The two water inlets 313 arranged opposite each other can cause the water flowing into the guide head 31 to impact each other, consuming the kinetic energy of the water flowing into the guide head 31, which helps to improve the stability of the water flowing out of the annular outlet 312.
[0042] In some embodiments, combined with Figures 1 to 3 As shown, the driving device 32 is a hydraulic cylinder, which consists of two synchronously moving hydraulic cylinders. The driving end of the driving device 32 is fixedly connected to the guide head 31, and the driving device 32 is fixedly connected to the upper threading mechanism 1. The two hydraulic cylinders are respectively arranged on both sides of the guide head 31 to ensure the stability of the drive.
[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. An automatic wire threading mechanism for a slow wire EDM machine, characterized in that, include: The upper wire threading mechanism (1) and the lower wire threading mechanism (2) are provided. The guide nozzle of the upper wire threading mechanism (1) leads out the electrode wire, and the guide nozzle of the lower wire threading mechanism (2) receives the electrode wire. Electrode wire guiding assembly (3), the electrode wire guiding assembly (3) includes a guide head (31) and a driving device (32). The guide head (31) is located directly below the guide nozzle of the upper wire threading mechanism (1). The driving device (32) drives the guide head (31) to move up and down. The guide head (31) has a wire hole (311) in the center. The bottom surface of the guide head (31) has an annular outlet (312). The wire hole (311) is located in the center of the annular outlet (312). The guide head (31) moves upward until the electrode wire led out by the upper wire threading mechanism (1) extends into the wire hole (311). The guide head (31) and the electrode wire move downward synchronously until the annular water outlet (312) is pressed onto the lead hole of the workpiece. Water from the annular water outlet (312) drives the electrode wire through the lead hole of the workpiece.
2. The automatic wire threading mechanism of the slow wire EDM machine tool according to claim 1, characterized in that, The electrode wire guiding assembly (3) also includes a rubber block (33), which is fixedly connected to the guide head (31). When the guide head (31) moves down, the rubber block (33) replaces the bottom surface of the guide head (31) and abuts against the workpiece.
3. The automatic wire threading mechanism of the slow wire EDM machine tool according to claim 2, characterized in that, The rubber block (33) is cylindrical and sleeved on the guide head (31), and the vertical height of the bottom surface of the rubber block (33) is lower than the vertical height of the bottom surface of the guide head (31).
4. The automatic wire threading mechanism of the slow wire EDM machine tool according to claim 1, characterized in that, The driving device (32) is a hydraulic cylinder, the driving end of the driving device (32) is fixedly connected to the guide head (31), and the driving device (32) is fixedly connected to the upper threading mechanism (1).
5. The automatic wire threading mechanism of the slow wire EDM machine tool according to claim 4, characterized in that, The drive device (32) includes two hydraulic cylinders that move synchronously and are respectively located on both sides of the guide head (31).
6. The automatic wire threading mechanism of the slow wire EDM machine tool according to claim 1, characterized in that, The vertical height of the outer ring sidewall of the annular outlet (312) is lower than the vertical height of the inner ring sidewall of the annular outlet (312).
7. The automatic wire threading mechanism of the slow wire EDM machine tool according to claim 1, characterized in that, The guide head (31) is provided with a water inlet (313), through which water is supplied to the guide head (31).
8. The automatic wire threading mechanism of the slow wire EDM machine tool according to claim 7, characterized in that, The guide head (31) has two water inlets (313), which are symmetrically arranged on the side walls on both sides of the guide head (31).
9. The automatic wire threading mechanism of the slow wire EDM machine tool according to claim 7, characterized in that, It also includes a water supply pump (34), the outlet of which is connected to the inlet (313).
10. The automatic wire threading mechanism of the slow wire EDM machine tool according to claim 1, characterized in that, The diameter of the wire hole (311) is between 1 mm and 2 mm.