A self-limiting wire guide device for high-speed reciprocating wire EDM wire cutting of fine wires

Abstract

A high-speed reciprocating wire-cutting electric spark wire cutting fine wire cutting self-limiting wire guide device belongs to the field of electric spark wire cutting processing technology. It is characterized in that it includes an upper self-limiting device, a molybdenum wire, and a lower self-limiting device connected in sequence. The upper and lower self-limiting devices are installed in symmetrical positions and have exactly the same structure. The limiting device is composed of components such as a limiting baffle, a fixing hole, a clamping screw, a feed bolt, and a limiting base. The limiting baffle is one on each side to limit the vibration of the electrode wire. The fixing nut is fixed on the limiting base one on each side. The feed bolt is used to fix and adjust the position of the limiting plate in the horizontal direction. The clamping screw is used to fix the position of the limiting plate in the vertical direction. The limiting base is the main body of the self-limiting wire guide. The limiting baffle, the fixing nut, the clamping screw, and the feed bolt are all installed on the limiting base. The use of the limiting device is simple to thread, the electrode wire has a long service life, and the processing surface quality is good.

Description

Technical Field

[0001] The invention relates to the field of electric spark wire cutting processing equipment, in particular to a high-speed reciprocating electric spark wire cutting fine wire cutting self-limiting wire guide device. Background Art

[0002] Wire EDM is a process that uses the instantaneous high temperature generated by pulsed electric spark discharge between the workpiece and the electrode wire to erode the workpiece material. Wire EDM can be divided into two forms according to the wire feeding method and wire feeding speed: low-speed unidirectional wire EDM and high-speed reciprocating wire EDM. The electrode wire of low-speed unidirectional wire EDM is mostly made of brass wire. During processing, the electrode wire runs in one direction at a speed of 0.03m / s-0.2m / s, and the electrode wire can only be used once; high-speed reciprocating wire EDM is an original creation of my country, and the electrode wire on it is mostly made of molybdenum wire. During the processing, the electrode wire runs back and forth at a high speed of 10m / s-12m / s. The electrode wire can run back and forth in a cycle. Due to its extremely high cost performance, it has been widely used in mold, automobile and other processing and manufacturing fields.

[0003] High-speed reciprocating wire EDM is a complex processing system, which is affected by many factors during processing. Among them, the state of the electrode wire has a very obvious impact on the processing. The spatial position of the electrode wire below is more difficult to stabilize than the traditional wire diameter, and the jitter will have an adverse effect on the processing accuracy and surface roughness. In order to enhance the stability of the electrode wire during the reciprocating wire EDM wire cutting process, a wire guide is required to control the state of the electrode wire. There are two main types of commonly used wire guides: ruby ​​round hole wire guide and limit rod wire guide.

[0004] Although the existing ruby ​​wire guide and limit rod wire guide can control the spatial position of the electrode wire to a certain extent, these two wire guides also have obvious disadvantages. The limit rod wire guide limits the electrode wire through the limit rod and the upper and lower guide wheels, but because the limit rod can only limit the electrode wire in a certain direction, the effect is poor when processing parts with complex shapes. In addition, the amount of pressure on the electrode wire on the limit rod cannot be controlled during processing, and the contact angle between the electrode wire and the limit rod is difficult to control. As the processing proceeds, the electrode wire will wear against the limit rod, causing a slit on the limit rod, resulting in poor limiting effect. The ruby ​​wire guide relies on the ruby ​​circular hole to limit the spatial position of the electrode wire. The circular hole can limit the electrode wire in any direction, but as the friction between the electrode wire and the circular hole causes the diameter of the circular hole to become larger and larger, resulting in a poor limiting effect, and the diameter of the ruby ​​limiter circular hole is only about 0.01mm larger than the wire diameter, which increases the difficulty of threading the wire. And as the wire diameter decreases, the difficulty and cost of manufacturing the ruby ​​stopper circular hole increase.

[0005] In view of the shortcomings of ruby ​​wire guides and limit rod wire guides, the present invention proposes a self-limiting wire guide for high-speed reciprocating wire EDM wire cutting. There are two upper and lower limit rings in the self-limiting wire guide, and the spatial position of the electrode wire is controlled by the limiting effect of the limit rings. The limiting hole of the wire guide is simple to process, and there is no direct contact between the electrode wire and the self-limiting wire guide during EDM wire cutting, which can greatly reduce the friction between the electrode wire and the limiter, reduce the loss of the electrode wire, and increase the service life of the electrode wire. The self-limiting wire guide in the present invention is processed using 3D printing rapid prototyping technology and can be quickly customized according to different processing environments, so it has the characteristics of strong applicability. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and to propose a high-speed reciprocating wire-feeding self-limiting wire guide device. By using this device, the friction between the electrode wire and the limiting device can be reduced, and the service life of the electrode wire can be increased while limiting the electrode wire. The limiting mark is formed by electric discharge machining according to the electrode wire used, thereby improving the adaptability of the wire guide to electrode wires of different wire diameters.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A high-speed reciprocating wire-cutting electric spark wire cutting fine wire cutting self-limiting wire guide device, characterized in that it includes an upper self-limiting device, a molybdenum wire, and a lower self-limiting device connected in sequence, the upper and lower self-limiting devices are installed in symmetrical positions and have exactly the same structure, the limiting device is composed of components such as a limiting baffle, a fixing nut, a clamping screw, a feed bolt, and a limiting base, the limiting baffle is one on each side to limit the vibration of the electrode wire, the fixing nut is fixed on the limiting base one on each side, the feed bolt is used to fix and adjust the position of the limiting plate in the horizontal direction, the clamping screw is used to fix the position of the limiting plate in the vertical direction, the limiting base is the main body of the self-limiting wire guide, and the limiting baffle, the fixing nut, the clamping screw, and the feed bolt are all installed on the limiting base. By using the self-limiting wire guide device, the quality of the machined surface can be improved and the stripes generated on the workpiece surface due to the vibration of the electrode wire can be reduced.

[0009] The limit baffle is provided with a limit mark, and the limit marks of electrode wires with different diameters are different. The processing method of the limit mark is simple and easy to operate.

[0010] The two limit baffles in the limit device can form a set of limit rings of the upper self-limiting device, and the other two limit baffles can form a set of limit rings of the lower self-limiting device, and L is the spacing between the limit rings.

[0011] The limiting base is made of PLA material through 3D printing using FDM molding technology, and has a simple structure and can be quickly formed according to actual needs.

[0012] The limiting base comprises upper and lower working fluid flow channels and a molybdenum wire running channel.

[0013] The fixing nut cooperates with the feed bolt, and the end of the feed bolt contacts the limit stopper to limit the position of the electrode wire in the horizontal direction.

[0014] The working fluid flow channel on the limiting base is divided into two, the lower flow channel is the main flow channel to provide working fluid to the wire cutting processing area, and the upper flow channel is the auxiliary flow channel to provide damping effect on the electrode wire through part of the working fluid, thereby further limiting the jitter of the electrode wire.

[0015] The present invention has the following beneficial effects:

[0016] (1) Compared with the traditional ruby ​​round hole wire guide and the limit rod wire guide, the new self-limiting wire guide device has the advantages of simple wire threading and reduced electrode wire wear, which can greatly improve the service life of the electrode wire.

[0017] (2) The electrode wire is limited in any direction by two sets of upper and lower limit rings, avoiding the disadvantage that the traditional limit rod wire guide can only limit in a certain direction, and can reduce the change of the electrode wire in space and reduce the jitter of the electrode wire, thereby improving the processing accuracy and surface quality;

[0018] (3) In the self-limiting wire guide, since the two limiting baffles constituting the limiting ring are not located on the same horizontal plane, the limiting baffles are easy to disassemble, thereby overcoming the disadvantage of the traditional ruby ​​limiting device that is difficult to thread the wire;

[0019] (4) The limit mark of the upper limit baffle on the self-limiting device is processed by the method of electric spark wire cutting. The width of the limit mark produced by the processing can better limit the electrode wire of the electric spark wire cutting. When the limit device is used for processing, the electrode wire and the limit mark are in a critical state of contact. When balanced, the gap is the size of the discharge gap, which can limit the spatial position of the electrode wire and reduce the friction between the electrode wire and the limit hole, thereby increasing the service life of the electrode wire.

[0020] (5) The self-limiting device can limit electrode wires of different diameters. By changing the diameter of the electrode wire in the processing limiting hole, a self-limiting wire guide device suitable for processing electrode wires of different diameters can be processed, which greatly improves the adaptability of the wire guide device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is the assembly diagram of the self-limiting wire guide.

[0022] Figure 2 This is the AA cross-sectional view of the self-limiting wire guide.

[0023] Figure 3 This is the assembly diagram of the self-limiting wire guide.

[0024] Figure 4 This is a diagram of the spatial position between the limit baffle and the electrode wire.

[0025] In the figure: 1-liquid inlet channel, 2-limiting base, 201-fixing hole, 202-lower flow channel, 203-upper flow channel, 3-electrode wire, 4-clamping screw, 5-feed bolt, 6-limit baffle, 601-upper limit baffle of upper self-limiting device, 602-lower limit baffle of upper self-limiting device, 603-upper limit baffle of lower self-limiting device, 604-lower limit baffle of lower self-limiting device, 7-upper self-limiting device, 8-lower self-limiting device. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0027] The present invention provides a high-speed reciprocating wire-cutting electric spark wire cutting wire cutting self-limiting wire guide device, such as Figure 1 and Figure 2 As shown, the limiting base 2 of the self-limiting wire guide is formed by printing PLA material through FDM molding technology. The fixing hole 201 in the limiting base 2 is fixed to the upper and lower wire arms of the wire cutting machine by screws; the limiting base 2 has built-in 3D printed lower flow channel 202 and upper flow channel 203, and the lower flow channel 202 and the upper flow channel 203 are connected to the liquid inlet channel 1. The end of the feed bolt 5 contacts the limiting baffle 6, and the tightening screw 4 lightly presses on the limiting baffle 6 and is connected to the positive pole of the pulse power supply. While feeding the limiting baffle 6 in the horizontal direction, an oscilloscope is used to monitor the inter-electrode discharge state until it is unloaded, and the other three limiting baffles are processed in sequence by this method, such as Figure 3 As shown, the upper self-limiting device 7 and the lower self-limiting device 8 are installed in symmetrical positions.

[0028] During processing, the spatial position between the limit stopper 6 and the electrode wire 3 is as follows: Figure 4 The distance between the two limit baffles 6 in each set of limit rings is L. The limit ring gap L in the device has an isolation and buffering effect on the low-frequency and large-amplitude vibration of the electrode wire, and can be adjusted according to actual processing requirements.

[0029] Regarding the limitation of the protection scope of the present invention, those skilled in the art should understand that, based on the technical solution of the present invention, various modifications or variations that can be made by those skilled in the art without creative work are still within the protection scope of the present invention.

Claims

1. A high-speed reciprocating wire EDM wire cutting wire cutting self-limiting wire guide device, It is characterized in that The invention comprises an upper self-limiting device (7), an electrode wire (3), and a lower self-limiting device (8) which are connected in sequence. The upper and lower self-limiting devices are installed in symmetrical positions and have completely the same structure. The limit device comprises a limit baffle (6), a fixing hole (201), a clamping screw (4), a feed bolt (5), and a limit base (2). The limit baffle (6) is provided at each of the left and right positions to limit the vibration of the electrode wire (3). The fixing hole (201) is on the limit base (2). The feed bolt (5) is used to fix and adjust the position of the limit plate (6) in the horizontal direction. The clamping screw (4) is used to fix the position of the limit plate (6) in the vertical direction. The limit base (2) is a self-limiting device. The main body of the wire guide, the limit baffle (6), the clamping screw (4), and the feed bolt (5) are all installed on the limit base (2); the limit base (2) is made of PLA material through FDM molding technology 3D printing, and the liquid inlet channel (1), the lower flow channel (202), the upper flow channel (203) and the fixing hole (201) are directly printed and formed, and the structure is simple and can be quickly formed according to actual needs; the working fluid flow channel on the limit base (2) is divided into two upper and lower parts, the lower flow channel (202) is the main flow channel to provide working fluid for the wire cutting processing area, and the upper flow channel (203) is the auxiliary flow channel to pass part of the working fluid to provide a damping effect on the electrode wire (3), thereby further limiting the shaking of the electrode wire (3); The upper self-limiting device upper limit baffle (601) and the upper self-limiting device lower limit baffle (602) in the limit device form a set of limit rings of the upper self-limiting device (7), and the lower self-limiting device upper limit baffle (603) and the lower self-limiting device lower limit baffle (604) form a set of limit rings of the lower self-limiting device (10). l is the spacing of the limit rings.

2. A high-speed reciprocating wire EDM wire cutting self-limiting wire guide device according to claim 1, Features: The limit stopper (6) has a limit mark, and the limit marks of electrode wires (3) with different diameters are different. The processing method of the limit mark is simple and easy to operate.

3. A high-speed reciprocating wire EDM wire cutting self-limiting wire guide device according to claim 1, Features: The limiting base (2) contains a running channel for the electrode wire (3).

4. A high-speed reciprocating wire EDM wire cutting self-limiting wire guide device according to claim 1, Features: The fixing hole (201) is fixed to the upper and lower wire arms of the machine tool, and the end of the feed bolt (5) is in contact with the limit stopper (6), thereby limiting the position of the electrode wire in the horizontal direction.

5. The high-speed reciprocating wire EDM wire cutting self-limiting wire guide device according to claim 1, Features: Compared with traditional ruby ​​round hole wire guides and limit rod wire guides, the self-limiting wire guide has the advantages of accurate limiting and positioning, reduced wear of the electrode wire (3), and can greatly increase the service life of the electrode wire (3).

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