Electrospark tool for machining inner wall of thin-walled stainless steel part

Abstract

The utility model relates to a kind of machining thin-walled stainless steel part inner wall's electric spark tooling, and it is related to the field of thin-walled stainless steel part processing.This electric spark tooling can efficiently adapt the inner wall processing of thin-walled stainless steel part, effectively replaces traditional milling machine processing by optimizing structure design, both completely avoid the interference problem that milling machine processing is easy to produce, and significantly reduce the stress deformation risk of thin-walled part, Ensure that processing surface is smooth and continuous, appearance is uniform and consistent.Also, it uses rigid structure easy to make, adapter stability is excellent, can reduce production defective rate, especially suitable for small-batch production and product rapid development scene.In addition, compared with prior art, the tooling does not need milling cutter and angle head, significantly reduces tool cost and equipment investment;It is easy to operate, disassembly is quick, and can improve processing efficiency, help to respond to order demand quickly.

Description

Technical Field

[0001] This utility model relates to the field of thin-walled stainless steel parts processing technology, and in particular to an electrical discharge tooling for processing the inner wall of thin-walled stainless steel parts. Background Technology

[0002] Thin-walled stainless steel parts are widely used in aerospace, precision instruments, and other fields due to their light weight, high strength, and good corrosion resistance. However, their thin walls and easily deformable structure present many challenges for internal wall machining. Traditional machining often relies on milling machines with special tools and angle heads. However, the milling machine machining path is easily limited by the shape of the part, and tool interference frequently occurs when machining complex internal wall structures, resulting in defects such as scratches and dents on the machined surface and poor consistency in the appearance of the finished product.

[0003] To reduce the risk of deformation, existing technologies often adjust by reducing cutting speed and adding clamping fixtures. However, this not only significantly reduces processing efficiency but also requires the investment of special cutting tools and angle heads, increasing equipment and consumable costs. Especially for small-batch production or new product development scenarios, the high cost and low flexibility of traditional processing methods are more prominent, making it difficult to meet enterprises' needs for cost reduction, efficiency improvement, and rapid order response. Summary of the Invention

[0004] The purpose of this invention is to provide an electrical discharge machining (EDM) fixture for machining the inner wall of thin-walled stainless steel parts, so as to solve the problems existing in the prior art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: An electrical discharge machining fixture for machining the inner wall of thin-walled stainless steel parts includes: The base plate is mounted on the worktable of the EDM machine. Two lower C-shaped blocks are installed on the base plate at intervals; The first and second upper C-shaped blocks are detachably connected to the two lower C-shaped blocks, respectively. The inner contours of the first and second upper C-shaped blocks on the opposite side of the two lower C-shaped blocks match the shape of the thin-walled stainless steel part, for clamping the thin-walled stainless steel part; and The conductive connecting rod has its interface end connected to the EDM interface of the EDM forming machine. Its processing end is equipped with a special-shaped electrode adapted to the actual working conditions. The special-shaped electrode at its processing end can process the inner wall of thin-walled stainless steel parts into the corresponding stepped structure. The first upper C-shaped block has a pin in the middle, which is inserted into a rotation hole on the thin-walled stainless steel part to restrict the rotation of the thin-walled stainless steel part.

[0006] In some embodiments, the first upper C-block and the second upper C-block are detachably connected to the two lower C-blocks respectively by a first bolt.

[0007] In some embodiments, both lower C-blocks are detachably connected to the base plate by a second bolt.

[0008] In some embodiments, the two lower C-blocks and the base plate are further positioned relative to each other by locating pins.

[0009] In some embodiments, the base plate is detachably connected to the worktable of the EDM machine via a fourth bolt.

[0010] In some embodiments, the base plate and the worktable of the EDM machine are also limited in relative position by a key.

[0011] In some embodiments, the key is mounted to the bottom of the base plate by a third bolt.

[0012] The beneficial effects of the technical solution provided by this utility model include at least the following: This EDM fixture is highly adaptable to the internal machining of thin-walled stainless steel parts. Through optimized structural design, it effectively replaces traditional milling, completely avoiding interference problems common in milling and significantly reducing the risk of stress deformation in thin-walled parts, ensuring a smooth, continuous, and uniformly aesthetic machined surface. Furthermore, its easily manufactured rigid structure provides excellent transition stability, reducing production defect rates, making it particularly suitable for small-batch production and rapid product development scenarios. In addition, compared to existing technologies, this fixture eliminates the need for milling cutters and angle heads, significantly reducing tooling costs and equipment investment; its ease of operation and quick disassembly also improve machining efficiency and facilitate rapid response to order demands. Attached Figure Description

[0013] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0014] Figure 1 This illustration shows an isometric view of an electrical discharge machining fixture for machining the inner wall of a thin-walled stainless steel part, provided in an exemplary embodiment of the present invention.

[0015] Figure 2 This is a front view schematic diagram of an electrical discharge tooling for machining the inner wall of a thin-walled stainless steel part according to an exemplary embodiment of the present invention.

[0016] Figure 3 This illustration shows a schematic diagram of the conductive link of an electrical discharge tool for machining the inner wall of a thin-walled stainless steel part, provided in an exemplary embodiment of the present invention.

[0017] In the picture: 1. Bolt; 2. First upper C-shaped block; 3. First bolt; 4. Lower C-shaped block; 5. Second bolt; 6. Base plate; 7. Key; 8. The third bolt; 9. Second upper C-shaped block; 10. Positioning pin; 11. Conductive connecting rod; 12. Fourth bolt; 13. Thin-walled stainless steel parts. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] In this specification, identical components are represented by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings of this utility model, while the terms "bottom surface," "top surface," "inner," and "outer" refer to directions towards or away from a specific component, respectively. Furthermore, 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 that feature. In the description of this utility model, "multiple" means two or more.

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This diagram shows an isometric view of an electrical discharge machining fixture for machining the inner wall of a thin-walled stainless steel part, provided in an exemplary embodiment of the present invention. Figure 2 This is a front view schematic diagram of an electrical discharge machining fixture for machining the inner wall of a thin-walled stainless steel part, provided in an exemplary embodiment of the present invention. Figure 3This diagram illustrates the structure of a conductive link in an EDM fixture for machining the inner wall of a thin-walled stainless steel part, provided in an exemplary embodiment of the present invention. The EDM fixture includes: a base plate 6 mounted on the worktable of an EDM machine; two lower C-shaped blocks 4, spaced apart and mounted on the base plate 6; a first upper C-shaped block 2 and a second upper C-shaped block 9, each detachably connected to the two lower C-shaped blocks 4. The inner contours of the first upper C-shaped block 2 and the second upper C-shaped block 9 on the side opposite to the two lower C-shaped blocks 4 are not perpendicular to the thin wall. The stainless steel part 13 is matched in shape and is used to press the thin-walled stainless steel part 13; and the conductive connecting rod 11, whose interface end 111 is connected to the EDM interface of the EDM forming machine, and whose processing end 112 is equipped with a special-shaped electrode adapted to the actual working conditions. The special-shaped electrode of the processing end 112 can process the inner wall of the thin-walled stainless steel part 13 into a corresponding stepped structure; wherein, the middle part of the first upper C-shaped block 2 is provided with a pin 1, which is inserted into the rotation hole on the thin-walled stainless steel part 13 to restrict the rotation of the thin-walled stainless steel part 13.

[0022] In this embodiment, two spaced-apart lower C-shaped blocks 4 form a symmetrical support structure, adapting to the placement requirements of the thin-walled stainless steel part 13 and preventing deformation of the part due to single-point support. The first upper C-shaped block 2, the second upper C-shaped block 9, and the lower C-shaped block 4 are detachably connected and have a contour-adaptive design, allowing for flexible assembly and disassembly of the thin-walled stainless steel part 13. The clamping method, conforming to the part's shape, prevents damage to the thin-walled part due to uneven clamping force while clamping the part. The conductive connecting rod 11 serves both energy conduction and electrode fixing functions, enabling power connection between the EDM machine and the electrode. Its design, adaptable to irregularly shaped electrodes, meets the customized processing requirements of the stepped structure on the inner wall of the thin-walled stainless steel part 13. The engagement of the pin 1 with the rotation hole on the thin-walled stainless steel part 13 not only restricts part rotation but also precisely positions the part during processing, preventing displacement caused by the impact force of EDM.

[0023] In some embodiments, see Figure 1 and Figure 2 The first upper C-block 2 and the second upper C-block 9 are detachably connected to the two lower C-blocks 4 by the first bolt 3 respectively.

[0024] In some embodiments, see Figure 1 and Figure 2 Both lower C-shaped blocks 4 are detachably connected to the base plate 6 via second bolts 5. The two lower C-shaped blocks 4 and the base plate 6 are also limited in relative position by locating pins 10.

[0025] In this embodiment, the positioning pin 10 defines the relative position of the lower C-block 4 and the base plate 6 to avoid installation deviations during bolt connection and ensure consistency between the two clamping operations.

[0026] In some embodiments, see Figure 1 and Figure 2 The base plate 6 is detachably connected to the worktable of the EDM machine via the fourth bolt 12. The base plate 6 and the worktable of the EDM machine are also positioned relative to each other via a key 7. The key 7 is mounted to the bottom of the base plate 6 via the third bolt 8.

[0027] In this embodiment, key 7 serves a positioning function, limiting the relative displacement between base plate 6 and worktable surface, preventing installation deviations during bolt connection, and ensuring consistent positioning of the tooling during repeated clamping. The third bolt 8 secures key 7 to the bottom of base plate 6, preventing key 7 from shifting due to processing impact.

[0028] Next, the working principle of an electrical discharge machining (EDM) tool for processing the inner wall of thin-walled stainless steel parts involved in the embodiments of this utility model will be explained.

[0029] Worktable pretreatment: Compressed air is used to clean the worktable of the EDM machine to remove surface dust, metal shavings and other impurities, so as to avoid impurities affecting the positioning accuracy of the tooling; Overall positioning and fixing of the tooling: Place the EDM tooling on the EDM machine worktable and use a dial indicator (or micrometer) to calibrate the flatness and parallelism of the tooling positioning surface to ensure that the error is controlled within 0.01mm; first, use key 7 to position the base plate 6 on the worktable, and then use the fourth bolt 12 to fasten the base plate 6 to the worktable to complete the overall fixing of the tooling; Clamping of thin-walled stainless steel parts: Place the thin-walled stainless steel part 13 on the positioning support surface of the two lower C-blocks 4, install the first upper C-block 2, and ensure that the pin 1 and the rotation hole of the part 13 are engaged to completely restrict the rotational freedom of the part; then pre-tighten the first bolt 3 to initially fix the first upper C-block 2, and then install the second upper C-block 9. After ensuring that the two upper C-blocks fit tightly with the shape of the thin-walled stainless steel part 13, gradually tighten the two sets of first bolts 3 to complete the final clamping of the thin-walled stainless steel part 13. Installation and calibration of conductive link: Connect the interface end 111 of conductive link 11 to the EDM interface of the EDM forming machine. Use a dial indicator (or micrometer) to calibrate the horizontal accuracy of conductive link 11 to ensure that the error is ≤0.01mm. After calibration, use the equipment's locking structure to lock and fix conductive link 11 to the EDM interface of the EDM forming machine. Electrode installation and machining execution: Install the irregularly shaped electrode adapted to the actual working conditions onto the machining end 112 of the conductive connecting rod 11. Use a dial indicator (or micrometer) to correct the coaxiality and perpendicularity of the irregularly shaped electrode. Use the EDM coordinate system to align the machining start point coordinates. According to the machining requirements of the inner wall step structure of the part, set parameters such as discharge gap, pulse width, and machining depth, and start the EDM to perform inner wall step machining.

[0030] In summary, this EDM fixture is highly adaptable to the internal machining of thin-walled stainless steel parts. Through optimized structural design, it effectively replaces traditional milling, completely avoiding interference problems inherent in milling and significantly reducing the risk of stress deformation in thin-walled parts, ensuring a smooth, continuous, and uniformly aesthetic machined surface. Furthermore, its easily manufactured rigid structure provides excellent transition stability, reducing production defect rates, making it particularly suitable for small-batch production and rapid product development scenarios. In addition, compared to existing technologies, this fixture eliminates the need for milling cutters and angle heads, significantly reducing tooling costs and equipment investment; its ease of operation and quick disassembly also improve machining efficiency and facilitate rapid response to order demands.

[0031] In the embodiments disclosed in this utility model, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments disclosed in this utility model according to the specific circumstances.

[0032] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An electrical discharge machining (EDM) fixture for machining the inner wall of thin-walled stainless steel parts, characterized in that, include: The base plate (6) is installed on the worktable of the EDM machine; Two lower C-shaped blocks (4) are installed on the base plate (6) at intervals; The first upper C-block (2) and the second upper C-block (9) are detachably connected to the two lower C-blocks (4), respectively. The inner contours of the first upper C-block (2) and the second upper C-block (9) on the opposite side of the two lower C-blocks (4) match the shape of the thin-walled stainless steel part (13) for pressing the thin-walled stainless steel part (13); and The conductive connecting rod (11) has an interface end (111) connected to the electrical discharge machining interface of the electrical discharge forming machine. Its machining end (112) is equipped with a special-shaped electrode adapted to the actual working conditions. The special-shaped electrode of its machining end (112) can process the inner wall of the thin-walled stainless steel part (13) into a corresponding stepped structure. The first upper C-shaped block (2) is provided with a pin (1) in the middle, and the pin (1) is inserted into the rotation hole on the thin-walled stainless steel part (13) to restrict the rotation of the thin-walled stainless steel part (13).

2. The electrical discharge machining fixture for machining the inner wall of thin-walled stainless steel parts according to claim 1, characterized in that, The first upper C-block (2) and the second upper C-block (9) are detachably connected to the two lower C-blocks (4) respectively by the first bolt (3).

3. The electrical discharge machining fixture for machining the inner wall of thin-walled stainless steel parts according to claim 1, characterized in that, Both of the lower C-shaped blocks (4) are detachably connected to the base plate (6) by the second bolt (5).

4. The electrical discharge machining fixture for machining the inner wall of thin-walled stainless steel parts according to claim 3, characterized in that, The two lower C-shaped blocks (4) and the base plate (6) are also limited in relative position by positioning pins (10).

5. The electrical discharge machining fixture for machining the inner wall of thin-walled stainless steel parts according to claim 1, characterized in that, The base plate (6) is detachably connected to the worktable of the EDM machine by the fourth bolt (12).

6. The electrical discharge machining fixture for machining the inner wall of thin-walled stainless steel parts according to claim 5, characterized in that, The base plate (6) and the worktable of the EDM machine are also limited in relative position by a key (7).

7. The electrical discharge machining fixture for machining the inner wall of thin-walled stainless steel parts according to claim 6, characterized in that, The key (7) is mounted to the bottom of the base plate (6) by a third bolt (8).

Images