A special locking bit shaft for a spark machine

Abstract

The utility model discloses a special lock bit axle of spark machine, including drive shaft subassembly, support subassembly, brake component and clamp component, be provided with drive shaft subassembly and brake component on support subassembly, drive shaft subassembly is connected with clamp component, and drive shaft subassembly can be connected different types of clamp component, and brake component can brake or release drive shaft subassembly, the utility model has the beneficial effects that through drive shaft subassembly can connect different types of clamp component, can achieve within 3 minutes fast replacement, and has adopted dual -mode brake device, utilizes brake component as main locking device, utilizes driver as auxiliary locking device, restrains tiny vibration, ensures arbitrary working condition C -shaft no drift, through adopting high resolution grating ruler real -time monitoring the actual angle of drive shaft subassembly, detects eccentric error time, and automatic drive drive shaft subassembly micro -amplitude rotation compensation angle deviation, eliminates the processing surface ripple because of eccentricity.

Description

Technical Field

[0001] This utility model relates to the field of EDM technology, and in particular to a locking shaft specifically for EDM machines. Background Technology

[0002] The industry commonly uses harmonic reducers to achieve high-precision indexing, but they have significant drawbacks: High cost: Harmonic reducers have extremely high requirements for materials and processes, leading to a significant increase in manufacturing costs; Limited load capacity: The flexible transmission characteristics of harmonic gears result in poor impact resistance, and the torque they can carry is usually less than 300Nm, making it difficult to meet the processing needs of large workpieces; Heat dissipation and lifespan issues: Long-term high-load operation easily leads to temperature rise, accelerating the fatigue of flexible gears and shortening their service life; In addition, the fixtures are limited and cannot be quickly replaced, limiting their applicability; Moreover, when machining complex features such as deep holes and irregular cavities, even small eccentricity errors between the electrode and the workpiece can directly lead to deterioration of the surface roughness or even dimensional deviations, requiring repeated shutdowns for manual adjustment, which seriously affects processing efficiency. Utility Model Content

[0003] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0004] In view of the problems existing in the above or prior art, this utility model is proposed.

[0005] Therefore, the purpose of this utility model is to provide a special locking shaft for EDM machines, which is compatible with different types of fixtures, such as swing racks and chucks, and adopts a direct-drive helical gear reducer scheme + dynamic eccentricity compensation algorithm to eliminate the ripples on the machining surface caused by eccentricity.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a special locking shaft for EDM machines, which includes a drive shaft assembly, a support assembly, a brake assembly, and a clamping assembly; the support assembly is provided with the drive shaft assembly and the brake assembly, the drive shaft assembly is connected to the clamping assembly, the drive shaft assembly can be connected to different types of clamping assemblies, and the brake assembly can brake or release the drive shaft assembly.

[0007] As a preferred embodiment of the EDM-specific locking shaft of this utility model, the drive shaft assembly includes a driver, a driver bracket, a coupling, and a transmission shaft; the driver bracket is connected to both the driver and the transmission shaft, the coupling is disposed within the driver bracket, and the driver is driven by the transmission shaft through the coupling.

[0008] As a preferred embodiment of the EDM-specific locking shaft of this utility model, it further includes a limiting component, which is disposed on the support component and can limit the rotation angle of the transmission shaft.

[0009] As a preferred embodiment of the EDM-specific locking shaft of this utility model, the limiting component includes a limiting block, a rotating ring, and a supporting block; a rotating ring is provided on the transmission shaft, and a supporting block is provided on one side of the rotating ring; the limiting block is provided inside the support component, and the limiting block can limit the rotation angle of the supporting block.

[0010] As a preferred embodiment of the EDM-specific locking shaft of this utility model, the rotating ring can rotate with the drive shaft; and at least one set of limiting blocks can be arranged around the drive shaft.

[0011] As a preferred embodiment of the EDM-specific locking shaft of this utility model, the braking assembly includes an electromagnetic brake pad and a brake seat; the electromagnetic brake pad is disposed on the outside of the drive shaft assembly and on the support assembly, and a brake seat is disposed on the upper end of the electromagnetic brake pad; the electromagnetic brake pad uses the switching on and off of power to enable normal operation or braking of the drive shaft assembly.

[0012] As a preferred embodiment of the EDM-specific locking shaft of this utility model, the support assembly includes a mounting plate and an electrode insulating plate; the electrode insulating plate is provided at the lower end of the mounting plate, the mounting plate can support the brake assembly, and through holes are provided on the inner sides of the mounting plate and the electrode insulating plate to allow the drive shaft assembly to pass through.

[0013] As a preferred embodiment of the EDM machine-specific locking shaft of this utility model, the clamping assembly includes a swing frame, which is connected to the drive shaft assembly. The swing frame can adjust the direction and installation height of the target part.

[0014] As a preferred embodiment of the EDM-specific locking shaft of this utility model, the clamping assembly further includes a chuck, which is connected to the drive shaft assembly and can fix the target part.

[0015] The beneficial effects of this utility model's dedicated locking shaft for EDM machines are as follows: Different types of clamping components can be connected via the drive shaft assembly, allowing for rapid replacement within 3 minutes. It also employs a dual-mode braking device, using the brake assembly as the main locking device and the driver as the auxiliary locking device to suppress minute vibrations and ensure C-axis drift-free operation under any working conditions. Furthermore, it utilizes a high-rigidity helical planetary reducer directly connected to a servo motor, achieving low cost and high load capacity through the multi-tooth contact characteristics of helical gear meshing: Compared to harmonic reducers, manufacturing costs are reduced by 40%, and torque capacity is increased by 2.6 times; Zero backlash transmission: Pre-load backlash elimination technology eliminates transmission backlash, achieving a repeatability accuracy of ≤±2″.

[0016] As a preferred embodiment of the control system of this utility model, it includes a dedicated locking shaft for EDM machines and further includes the following steps:

[0017] S1: Real-time monitoring of the actual angle of the drive shaft assembly using a high-resolution grating ruler;

[0018] S2: During the processing, if a radial eccentricity error between the electrode and the workpiece is detected due to clamping or thermal deformation, the system automatically calculates the compensation amount Δθ=arctan(ΔR / L);

[0019] S3: The angular deviation is compensated by a slight rotation of the drive shaft assembly, eliminating the ripples on the machined surface caused by eccentricity.

[0020] The beneficial effects of the control system of this utility model are as follows: This utility model uses a high-resolution grating ruler to monitor the actual angle of the drive shaft assembly in real time. When an eccentric error is detected, the drive shaft assembly is automatically driven to rotate slightly to compensate for the angle deviation, thereby eliminating the ripples on the machined surface caused by eccentricity. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0022] Figure 1 This is a schematic diagram of the chuck fixture for a dedicated locking shaft for EDM machines.

[0023] Figure 2 A schematic diagram of the overall fixture for the EDM machine's dedicated locking shaft, mounted on a swing bracket.

[0024] Figure 3 for Figure 1 Front view of the locking shaft for a medium EDM machine.

[0025] Figure 4 for Figure 3 A sectional view of the locking shaft for a medium EDM machine at point AA.

[0026] Figure 5 for Figure 3 A sectional view of the BB section of the locking shaft for a medium EDM machine.

[0027] Figure 6 A three-dimensional schematic diagram of a hidden brake assembly for a dedicated locking shaft of an EDM machine.

[0028] Figure 7 for Figure 6 Enlarged view of F1 on the dedicated locking shaft for EDM machines. Detailed Implementation

[0029] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0030] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments. Example 1

[0032] Reference Figures 1-7 This is the first embodiment of the present invention. This embodiment provides a special locking shaft for EDM machines, which includes a drive shaft assembly 1, a support assembly 2, a brake assembly 3, and a clamp assembly 4. The support assembly 2 can support the brake assembly 3 and the drive shaft assembly 1. The drive shaft assembly 1 can be used to connect different clamp assemblies 4. The brake assembly 3 can be used to brake or operate the drive shaft assembly 1 normally.

[0033] Specifically, it includes a drive shaft assembly 1, a support assembly 2, a brake assembly 3, and a clamp assembly 4; the support assembly 2 is provided with the drive shaft assembly 1 and the brake assembly 3, the drive shaft assembly 1 is connected to the clamp assembly 4, the drive shaft assembly 1 can be connected to different types of clamp assemblies 4, and the brake assembly 3 can brake or release the drive shaft assembly 1.

[0034] Furthermore, the drive shaft assembly 1 includes a driver 11, a driver bracket 12, a coupling, and a transmission shaft 13; the driver bracket 12 is connected to the driver 11 and the transmission shaft 13 respectively, the coupling is disposed in the driver bracket 12, the driver 11 is driven connected to the transmission shaft 13 through the coupling, and the driver 11 can assist in locking the coupling and the transmission shaft 13.

[0035] Preferably, the driver 11 can be a servo motor.

[0036] Preferably, the driver 11 can be used for auxiliary locking to suppress micro-vibrations.

[0037] Furthermore, it also includes a limiting component 5, which is disposed on the support component 2 and can limit the rotation angle of the drive shaft 13.

[0038] Preferably, the limiting component 5 can be restricted by the limiting component 5, and the corresponding limiting rotation angle can be set as needed.

[0039] Furthermore, the limiting component 5 includes a limiting block 51, a rotating ring 52, and a supporting block 53; the rotating ring 52 is provided on the transmission shaft 13, and the supporting block 53 is provided on one side of the rotating ring 52. The limiting block 51 is provided inside the support component 2, and the limiting block 51 can limit the rotation angle of the supporting block 53.

[0040] Furthermore, the rotating ring 52 can rotate with the drive shaft 13; at least one set of limit blocks 51 can be arranged around the drive shaft 13.

[0041] Preferably, the limiting block 51 is located inside the mounting plate 21 and protrudes inward by a certain length. The abutment block 53 on the rotating ring 52 protrudes by a certain length. When the rotating ring 52 rotates with the drive shaft 13, the abutment block 53 cannot rotate when it reaches the position of the limiting block 51, thus limiting the rotation angle.

[0042] Preferably, two sets of limit blocks 51 can be provided, so that the abutment block 53 can rotate between the two sets of limit blocks 51.

[0043] Furthermore, the brake assembly 3 includes an electromagnetic brake pad 31 and a brake seat 32; the electromagnetic brake pad 31 is disposed on the outside of the drive shaft assembly 1 and on the support assembly 2, and the upper end of the electromagnetic brake pad 31 is provided with a brake seat 32. The electromagnetic brake pad 31 uses the switching on and off of power to enable the drive shaft assembly 1 to operate normally or brake.

[0044] Preferably, the electromagnetic brake pad 31 is energized and engaged: when current passes through the magnetic coil of the electromagnetic brake pad, an electromagnetic force is generated, which engages the brake pad and separates it from the drive shaft 13. At this time, the drive shaft can operate normally or start.

[0045] Power-off braking: When the current is cut off, the electromagnetic force disappears, and the brake pads contact the drive shaft 13 under the action of the spring or other mechanical device, generating a frictional torque, which causes the drive shaft to stop quickly.

[0046] Furthermore, the support assembly 2 includes a mounting plate 21 and an electrode insulating plate 22; the electrode insulating plate 22 is provided at the lower end of the mounting plate 21, and the mounting plate 21 can support the brake assembly 3. Through holes are provided on the inner sides of the mounting plate 21 and the electrode insulating plate 22, allowing the drive shaft assembly 1 to pass through.

[0047] Furthermore, the clamping assembly 4 includes a swing frame 41, which is connected to the drive shaft assembly 1. The swing frame 41 can adjust the orientation and installation height of the target part.

[0048] Furthermore, the clamping assembly 4 also includes a chuck 42, which is connected to the drive shaft assembly 1 and can fix the target part.

[0049] It should be noted that the clamping assembly 4 can also be other clamping devices.

[0050] In summary, this utility model allows for the connection of different types of clamping assemblies 4 via the drive shaft assembly 1, enabling rapid replacement within 3 minutes. It also employs a dual-mode braking device, using the brake assembly 3 as the main locking device and the driver 11 as the auxiliary locking device to suppress minor vibrations and ensure C-axis drift-free operation under any working conditions. A high-rigidity helical planetary reducer with a torque capacity ≥800Nm is directly connected to the servo motor, achieving the following through the multi-tooth contact characteristics of helical gear meshing: Low cost and high load: Compared to harmonic reducers, manufacturing costs are reduced by 40%, and torque capacity is increased by 2.6 times; Zero backlash transmission: Pre-load backlash elimination technology eliminates transmission backlash, achieving a repeatability accuracy ≤±2″. Example 2

[0051] Reference Figures 1-7 This is the second embodiment of the present invention. Based on embodiment 1, it also includes a control system, including S1: real-time monitoring of the actual angle of the drive shaft assembly 1 through a high-resolution grating ruler;

[0052] S2: During the processing, if a radial eccentricity error ΔR is detected between the electrode and the workpiece due to clamping or thermal deformation, the system automatically calculates the compensation amount Δθ=arctan(ΔR / L), where L is the electrode length.

[0053] S3: The angular deviation is compensated by a slight rotation of the drive shaft assembly 1, eliminating the ripples on the machined surface caused by eccentricity.

[0054] In industrial machining, the post-clamping calibration of electrodes plays a crucial role in ensuring machining accuracy. Traditionally, after electrode clamping, operators must manually calibrate the parallelism between the electrode and the workpiece along the X and Y axes using specialized tools. This process involves sequentially adjusting the electrode's position along the X and Y axes, repeatedly observing, measuring, and fine-tuning to achieve parallelism between the electrode and the workpiece.

[0055] However, this traditional calibration method has many drawbacks. Firstly, the operation is cumbersome, requiring operators to concentrate intensely and repeatedly perform meticulous measurements and adjustments, consuming a significant amount of time and energy. Statistics show that completing a single electrode-workpiece parallelism calibration takes an average of several hours, greatly reducing production efficiency. Secondly, human operation inevitably involves individual differences; different operators have varying techniques and experience levels, making it difficult to guarantee calibration accuracy. The high rate of defective products due to calibration errors results in significant economic losses for enterprises.

[0056] Once the automatic alignment system for the locking axis is activated, it immediately enters its working state. First, the system controls the electrode to slowly approach the workpiece, performing an automatic edge-touching operation. During this process, high-precision sensors installed at key locations on the locking axis begin to function, quickly and accurately acquiring position data of the electrode and workpiece in contact along both the X and Y axes.

[0057] The acquired raw data is rapidly transmitted to the system's core computing module. Here, advanced algorithms perform in-depth analysis of this data, calculating the angular deviation between the electrode and the workpiece along the X and Y axes. Based on these precise calculations, the system generates corresponding control commands, specifying the direction and angle of rotation required for the locking axis.

[0058] Next, the locking shaft, guided by instructions and powered by its high-precision rotary drive, smoothly and quickly rotates to the designated angle. During rotation, the system continuously monitors the locking shaft's rotation status, ensuring its accuracy is controlled within a minimal error range. Once the locking shaft completes its rotation, the electrode and workpiece are parallel. At this point, the system issues a notification signal, informing the operator that the calibration is complete and subsequent processing steps can begin. The entire operation is seamless, greatly simplifying the complex process of traditional calibration and significantly improving work efficiency and calibration accuracy.

[0059] In summary, this utility model uses a high-resolution grating ruler to monitor the actual angle of the drive shaft assembly 1 in real time. When an eccentric error is detected, the drive shaft assembly 1 is automatically driven to rotate slightly to compensate for the angle deviation, thereby eliminating the ripples on the machined surface caused by eccentricity.

[0060] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structural equivalents but also equivalent structures. Without departing from the scope of this invention, other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0061] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the present invention as currently considered, or those features that are not relevant to implementing the present invention) may be omitted.

[0062] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0063] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A locking shaft specifically for EDM machines, characterized in that: It includes a drive shaft assembly (1), a support assembly (2), a brake assembly (3), and a clamp assembly (4); the support assembly (2) is provided with the drive shaft assembly (1) and the brake assembly (3), the drive shaft assembly (1) is connected to the clamp assembly (4), the drive shaft assembly (1) can be connected to different types of clamp assemblies (4), and the brake assembly (3) can brake or release the drive shaft assembly (1).

2. The EDM-specific locking shaft as described in claim 1, characterized in that: The drive shaft assembly (1) includes a driver (11), a driver bracket (12), a coupling, and a transmission shaft (13); the driver bracket (12) is connected to the driver (11) and the transmission shaft (13) respectively; the coupling is disposed in the driver bracket (12); the driver (11) is connected to the transmission shaft (13) through the coupling; the driver (11) can assist in locking the coupling and the transmission shaft (13).

3. The EDM-specific locking shaft as described in claim 2, characterized in that: It also includes a limiting component (5), which is disposed on the support component (2) and can limit the rotation angle of the drive shaft (13).

4. The EDM-specific locking shaft as described in claim 3, characterized in that: The limiting component (5) includes a limiting block (51), a rotating ring (52), and a supporting block (53); the rotating ring (52) is provided on the transmission shaft (13), and a supporting block (53) is provided on one side of the rotating ring (52). The limiting block (51) is provided inside the support component (2), and the limiting block (51) can limit the rotation angle of the supporting block (53).

5. The EDM-specific locking shaft as described in claim 4, characterized in that: The rotating ring (52) can rotate with the drive shaft (13); at least one set of the limiting blocks (51) can be arranged around the drive shaft (13).

6. The EDM-specific locking shaft as described in any one of claims 1 to 5, characterized in that: The brake assembly (3) includes an electromagnetic brake pad (31) and a brake seat (32); the electromagnetic brake pad (31) is disposed on the outside of the drive shaft assembly (1) and on the support assembly (2); the upper end of the electromagnetic brake pad (31) is provided with a brake seat (32); the electromagnetic brake pad (31) uses the power on and off to operate the drive shaft assembly (1) normally or brake it.

7. The EDM-specific locking shaft as described in claim 6, characterized in that: The support assembly (2) includes a mounting plate (21) and an electrode insulating plate (22); the lower end of the mounting plate (21) is provided with the electrode insulating plate (22), the mounting plate (21) can support the brake assembly (3), and the inner sides of the mounting plate (21) and the electrode insulating plate (22) are provided with through holes, which allow the drive shaft assembly (1) to pass through.

8. The EDM-specific locking shaft as described in claim 1, characterized in that: The clamp assembly (4) includes a swing frame (41) which is connected to the drive shaft assembly (1) and the swing frame (41) can adjust the direction and installation height of the target part.

9. The EDM-specific locking shaft as described in claim 8, characterized in that: The clamping assembly (4) further includes a chuck (42) which is connected to the drive shaft assembly (1) and can fix the target part.

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