Short nozzle electric spark hole jet processing tooling

Abstract

This utility model relates to a fixture for machining short nozzle EDM orifices, used for irregularly shaped short nozzles. The fixture includes a clamping body and a locking device. By setting a circular positioning groove that matches the circular cross-section of the bottom of the irregularly shaped short nozzle, a radial positioning reference is provided for the nozzle, solving the initial positioning error caused by mismatched positioning references in traditional clamping methods. At the same time, by setting a radially pressing locking device on the top sidewall of the clamping body, a uniform radial clamping force can be applied to the circular part at the bottom of the nozzle, overcoming the problem of uneven clamping force caused by the non-cylindrical structure at the top, and limiting the circumferential deflection tendency of the workpiece during processing, thereby significantly improving clamping stability and repeatability.

Description

Technical Field

[0001] This utility model relates to the field of fixture technology, and in particular to a tooling for machining short nozzle electric spark nozzles. Background Technology

[0002] In the field of EDM nozzle machining, existing fixtures mostly adopt end face clamping or external circular clamping methods. These methods have inherent defects for irregular short nozzles. When the bottom of the nozzle has a circular cross section and the top has a combination of concave arc and vertical section structure, its bottom circular contour needs to be radially positioned. However, the non-cylindrical structure of the top causes the traditional radial clamping force to be uneven. At the same time, end face clamping cannot restrict circumferential deflection, resulting in insufficient clamping stability and ultimately affecting the positional accuracy of multi-angle nozzle machining.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model discloses a short-nozzle EDM machining fixture to solve the problems of uneven radial clamping force caused by the non-cylindrical top structure, and insufficient clamping stability caused by the inability of end face clamping to restrict circumferential deflection, which ultimately affects the positional accuracy of multi-angle nozzle machining.

[0005] The technical solution adopted in this utility model is as follows: A short nozzle EDM machining fixture is used for machining irregularly shaped short nozzles. The bottom cross-section of the irregularly shaped short nozzle is circular, the top of the longitudinal section of the irregularly shaped short nozzle is an arc segment opening downwards, and the two sides of the bottom end of the arc segment are vertical segments. The short nozzle EDM machining fixture includes: The clamping body has a circular positioning groove at its top end, which matches the bottom cross-section of the irregular short nozzle. A locking device is provided on the top side wall of the clamping body, and the locking device radially presses against the bottom end of the irregular short nozzle located in the circular positioning groove.

[0006] A further technical solution is that the bottom end of the clamping body is provided with a drive shaft, the drive shaft is mounted on a rotary drive mechanism, and the rotary drive mechanism drives the clamping body to clamp the irregular short nozzle and rotate.

[0007] A further technical solution is that the bottom of the circular positioning groove is provided with a reference plane that fits against the bottom surface of the nozzle.

[0008] A further technical solution is that the locking device includes at least one locking screw arranged circumferentially along the clamping body, and the side wall of the clamping body is provided with a threaded hole that mates with the locking screw.

[0009] A further technical solution is that the clamping body includes a column and a circular base plate, the column is coaxially disposed on the circular base plate, the circular positioning groove is disposed at the top of the column, and the drive shaft is coaxially disposed at the bottom of the circular base plate.

[0010] A further technical solution is that a number of positioning holes are provided on the base plate along the outer circumference of the column.

[0011] A further technical solution is that the depth of the circular positioning groove is less than the height of the vertical section of the longitudinal profile of the irregular short nozzle.

[0012] A further technical solution is that the bottom of the circular positioning groove and the inner wall of the circular positioning groove are rounded.

[0013] The beneficial effects of this utility model embodiment are as follows: (i) A short nozzle EDM machining fixture for irregularly shaped short nozzles, comprising a clamping body and a locking device. By setting a circular positioning groove that matches the circular cross-section of the bottom of the irregularly shaped short nozzle, a radial positioning reference is provided for the irregularly shaped short nozzle, solving the initial positioning error caused by mismatch of positioning reference in traditional clamping methods; at the same time, by setting a radially pressing locking device on the side wall of the top of the clamping body, a uniform radial clamping force can be applied to the circular part at the bottom of the nozzle, overcoming the problem of uneven clamping force caused by the non-cylindrical structure at the top, and limiting the circumferential deflection tendency of the workpiece during the machining process, thereby significantly improving the clamping stability and repeatability accuracy.

[0014] (ii) Furthermore, the bottom of the fixture body is also provided with a drive shaft, which is mounted on a rotary drive mechanism. The rotary drive mechanism drives the fixture body to rotate while holding the irregularly shaped short nozzle. The fixture body is connected to the external rotary drive mechanism through the drive shaft. During the processing, the clamped irregularly shaped short nozzle is driven to make a precise circumferential motion around its central axis, thereby realizing the processing and positioning of nozzles at different circumferential angles and ensuring the indexing accuracy and positional consistency during multi-hole processing.

[0015] (iii) Further, the fixture includes a column and a circular base plate. The column is coaxially mounted on the circular base plate, a circular positioning groove is located at the top of the column, and a drive shaft is coaxially mounted at the bottom of the circular base plate. For example, several positioning holes are provided on the base plate along the outer circumference of the column. The circumferentially distributed positioning holes reduce the overall weight of the fixture and provide interfaces for subsequent expansion and installation of auxiliary devices, such as angle calibration plates or counterweights, thereby enhancing the adaptability of the fixture system. Attached Figure Description

[0016] Figure 1 This is a front view of the internal structure of a short nozzle EDM machining fixture according to the present invention.

[0017] Figure 2 This is a top view schematic diagram of a short nozzle EDM machining fixture according to the present invention.

[0018] In the picture: 100. Irregular short nozzle; 101. Arc segment; 102. Vertical segment; 200. Clamp body; 201. Circular positioning groove; 202. Reference plane; 203. Positioning hole; 210. Column; 220. Circular base plate; 300. Threaded hole; 400. Drive shaft. Detailed Implementation

[0019] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0020] First embodiment: like Figure 1 As shown, a short nozzle EDM machining fixture is used for an irregularly shaped short nozzle 100. The bottom cross-section of the irregularly shaped short nozzle 100 is circular, and the top of the longitudinal section of the irregularly shaped short nozzle 100 is an arc segment 101 opening downwards. The bottom sides of the arc segment 101 are vertical segments 102. The short nozzle EDM machining fixture includes a clamping body 200 and a locking device. A circular positioning groove 201 is provided at the top of the clamping body 200. Exemplarily, the bottom of the circular positioning groove 201 is provided with a reference plane 202 that fits against the bottom surface of the nozzle. The circular positioning groove 201 matches the bottom cross-section of the irregularly shaped short nozzle 100. Exemplarily, the depth of the circular positioning groove 201 is less than the height of the vertical segments 102 of the longitudinal section of the irregularly shaped short nozzle 100.

[0021] like Figure 1 As shown, a locking device is disposed on the top sidewall of the clamping body 200, and the locking device radially presses against the bottom end of the irregular short nozzle 100 located in the circular positioning groove 201. Exemplarily, the locking device includes at least one locking screw disposed circumferentially along the clamping body 200, and the sidewall of the clamping body 200 is provided with a threaded hole 300 that mates with the locking screw.

[0022] like Figure 1As shown, the bottom end of the fixture 200 is further provided with a drive shaft 400, which is mounted on a rotary drive mechanism. The rotary drive mechanism drives the fixture 200 to rotate while holding the irregular short nozzle 100. The fixture 200 is connected to the external rotary drive mechanism via the drive shaft 400. During the processing, the clamped irregular short nozzle 100 is driven to make precise circumferential motion around its central axis, thereby realizing the processing and positioning of nozzles at different circumferential angles and ensuring the indexing accuracy and positional consistency during multi-hole processing.

[0023] like Figures 1-2 As shown, the fixture body 200 further includes a column 210 and a circular base plate 220. The column 210 is coaxially mounted on the circular base plate 220, a circular positioning groove 201 is provided at the top of the column 210, and a drive shaft 400 is coaxially mounted at the bottom of the circular base plate 220. For example, a plurality of positioning holes 203 are provided on the base plate along the outer circumference of the column 210. The circumferentially distributed positioning holes 203 not only reduce the overall weight of the fixture but also provide an interface for subsequent expansion and installation of auxiliary devices, such as angle calibration plates or counterweights, thereby enhancing the adaptability of the fixture system.

[0024] like Figure 1 As shown, the bottom of the circular positioning groove 201 and the inner wall of the circular positioning groove 201 are further rounded. This prevents interference and collision between the bottom edge of the nozzle and the groove opening, protects the surface accuracy of the nozzle, and reduces the difficulty of clamping operations.

[0025] In operation, this embodiment is as follows: The operator first places the bottom end of the irregular short nozzle 100 into the circular positioning groove 201 at the top of the fixture 200, so that its bottom surface is in contact with the reference plane 202 at the bottom of the groove to achieve axial positioning. At the same time, the matching relationship between the circular positioning groove 201 and the circular cross-section of the bottom end of the nozzle is used to complete the initial radial positioning. Then, the locking screws on the side wall of the fixture 200 are tightened to radially press against the outer circular surface of the bottom end of the nozzle, ensuring that the nozzle is reliably fixed in the circumferential direction. After clamping, the drive shaft 400 at the bottom end of the fixture 200 is installed on the rotary drive mechanism of the EDM machine. During processing, the fixture 200 and the nozzle are rotated as a whole by the rotary drive mechanism according to the nozzle angle requirements, thereby adjusting the circumferential processing orientation so that the electrode can be accurately aligned with the position to be processed and complete the processing of nozzles at different spatial angles.

[0026] In this embodiment, by setting a circular positioning groove 201 that matches the circular cross-section of the bottom end of the irregular short nozzle 100, a radial positioning reference is provided for the irregular short nozzle 100, which solves the initial positioning error caused by the mismatch of the positioning reference in the traditional clamping method. At the same time, by setting a radial clamping locking device on the top side wall of the clamping body 200, a uniform radial clamping force can be applied to the circular part at the bottom end of the nozzle, which overcomes the problem of uneven clamping force caused by the non-cylindrical structure at the top, and also limits the circumferential deflection tendency of the workpiece during the processing, thereby significantly improving the clamping stability and repeatability accuracy.

[0027] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A tooling for machining short nozzle electrical discharge holes, characterized in that, For irregularly shaped short nozzles, the bottom cross-section of the irregularly shaped short nozzle is circular, the top of the longitudinal section of the irregularly shaped short nozzle is an arc segment opening downwards, and the two sides of the bottom end of the arc segment are vertical segments. The tooling for machining the short nozzle EDM nozzle hole includes: The clamping body has a circular positioning groove at its top end, which matches the bottom cross-section of the irregular short nozzle. A locking device is provided on the top side wall of the clamping body, and the locking device radially presses against the bottom end of the irregular short nozzle located in the circular positioning groove.

2. The short-nozzle EDM machining fixture according to claim 1, characterized in that: The bottom end of the clamping body is also provided with a drive shaft, which is mounted on a rotary drive mechanism. The rotary drive mechanism drives the clamping body to rotate while holding the irregular short nozzle.

3. The short-nozzle EDM machining fixture according to claim 1, characterized in that: The bottom of the circular positioning groove is provided with a reference plane that fits against the bottom surface of the nozzle.

4. The short-nozzle EDM machining fixture according to claim 1, characterized in that: The locking device includes at least one locking screw arranged circumferentially along the clamp body, and the side wall of the clamp body is provided with a threaded hole that mates with the locking screw.

5. The short-nozzle EDM machining fixture according to claim 2, characterized in that: The clamping device includes a column and a circular base plate. The column is coaxially disposed on the circular base plate, the circular positioning groove is disposed at the top of the column, and the drive shaft is coaxially disposed at the bottom of the circular base plate.

6. The short-nozzle EDM machining fixture according to claim 5, characterized in that: The base plate has several positioning holes along the outer circumference of the column.

7. The short-nozzle EDM machining fixture according to claim 1, characterized in that: The depth of the circular positioning groove is less than the height of the vertical section of the longitudinal profile of the irregular short nozzle.

8. The short-nozzle EDM machining fixture according to claim 1, characterized in that: The bottom of the circular positioning groove and the inner wall of the circular positioning groove are rounded.

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