Silicon nitride ceramic nozzle inner hole electrolytic machining tooling

Abstract

This utility model relates to the field of nozzle processing technology, and in particular to a tooling for electrolytic machining of the inner hole of a silicon nitride ceramic nozzle. It includes a base on which a tooling mechanism is mounted for nozzle positioning. The tooling mechanism includes: a main assembly comprising several housings fixed to the top of the base; four circumferentially distributed guide seats fixed inside each housing; a locating pin slidably mounted inside each guide seat; a protruding rod fixed inside each locating pin; a ring mounted inside each housing; four circumferentially distributed guide grooves inside the ring; and the protruding rod located inside each guide groove. A control assembly is mounted on the base and used to control the positioning of the nozzle by the main assembly. Automatic centering and clamping of the nozzle is achieved through rotational drive, ensuring that the inner hole is coaxial with the electrode. A uniform gap is maintained between the electrode and the inner hole for electrolyte flow, and a return channel is provided to prevent liquid accumulation, ensuring the accuracy and stability of the electrolytic machining.

Description

Technical Field

[0001] This utility model relates to the field of nozzle processing technology, specifically to a tooling for electrolytic machining of the inner hole of a silicon nitride ceramic nozzle. Background Technology

[0002] With the increasing demand for high-performance ceramic components in aerospace, energy and power fields, silicon nitride ceramics, due to their excellent high temperature resistance, corrosion resistance and mechanical properties, are widely used in key components such as advanced engine nozzles, which puts forward higher requirements for high-precision and complex surface internal hole processing technology.

[0003] According to CN115090976A, an electrolytic machining fixture and method for fuel nozzle nozzles are disclosed. This technology discloses "an electrolytic machining fixture and method for fuel nozzle nozzles. The fixture mounts the cathode on a cathode positioning and alignment component and then onto the machine tool spindle via a spindle connecting block, allowing for easy vertical movement and adjustment of the cathode. The installation and removal of the cathode is very convenient, and the verticality of the cathode can be easily adjusted, ensuring the verticality of the nozzle machining on the fuel nozzle. Furthermore, the open flow field design of the electrolyte flow channel allows for more flexible and varied structural design. By using the electrolytic machining fixture of this invention, electrolytic machining technology can be applied to the machining of fuel nozzle nozzles. Electrolytic machining is based on the principle of electrochemical anodic dissolution for material removal, is unaffected by material cutting performance, has no cathode wear, can be used for a long time, has high processing efficiency, produces high-quality nozzle surfaces without recast layers, and is well-suited for mass production."

[0004] In the prior art, during the electrolytic machining of the inner hole of a silicon nitride ceramic nozzle, the high hardness and brittleness of the ceramic material make it easy for the nozzle to break due to uneven force caused by traditional mechanical clamping methods. At the same time, it is difficult to ensure the precise coaxiality between the electrode and the inner hole, resulting in uneven electrolytic machining gaps, which affects machining accuracy and surface quality. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a tooling for electrolytic machining of the inner hole of a silicon nitride ceramic nozzle. The nozzle is automatically centered and clamped by rotation drive, ensuring that the inner hole is coaxial with the electrode. At the same time, a uniform gap is left between the electrode and the inner hole to allow the electrolyte to flow, and a return channel is set to prevent liquid accumulation, thus ensuring the accuracy and stability of electrolytic machining.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a tooling for electrolytic machining of the inner hole of a silicon nitride ceramic nozzle, comprising a base, wherein a tooling mechanism is provided on the base for nozzle positioning, and the tooling mechanism includes:

[0007] The main component includes several housings fixed to the top of the base. Inside each housing, four guide seats are fixed in a circular pattern. A positioning pin is slidably installed inside each guide seat. A protruding rod is fixed inside each positioning pin. A ring is installed inside each housing. The ring has four guide grooves in a circular pattern, and the protruding rod is located inside the guide grooves.

[0008] A control component, mounted on the base, is used to control the positioning of the nozzle by the main body component;

[0009] The electrode assembly includes an electrode plate fixed to the top of the base, with several electrode heads fixed to the top of the electrode plate, and the electrode heads are located at the center inside the housing.

[0010] Preferably, the main component further includes a gear ring fixed to the outer wall of the ring, a shaft lug fixed to the outer wall of the housing, and a gear rotatably mounted inside the shaft lug and meshing with the gear ring for transmission.

[0011] Preferably, the control component includes a mounting bracket fixed to the rear end of the top of the base, a guide rail fixed to the upper end of the mounting bracket, and a rack slidably mounted inside the guide rail and meshing with a gear for transmission.

[0012] Preferably, the control component further includes an extension lug fixed to one side of the rear end of the rack, a threaded seat fixed to one end of the mounting bracket, a knob screw installed through the threaded seat, and the knob screw being rotatably connected to the extension lug.

[0013] Preferably, the main body component further includes four cavities circumferentially distributed at the lower end of the housing.

[0014] Preferably, both the gear ring and the gear are made of polyetheretherketone (PEEK).

[0015] Beneficial effects

[0016] This invention provides a tooling for electrolytic machining of the inner hole of a silicon nitride ceramic nozzle. Compared with the prior art, it has the following advantages:

[0017] 1. By rotating the knob screw and engaging the extension lug, the rack slides along the inside of the guide rail. When the rack moves, it drives the ring to rotate through the gear and gear ring. When the ring rotates, it drives the positioning pin to slide along the inside of the guide seat through the guide groove and the protrusion, thereby achieving automatic centering and clamping of the nozzle, making the nozzle inner hole coaxial with the electrode head, and ensuring the uniformity of electrolytic processing.

[0018] 2. After the nozzle is placed inside the housing, the electrode head extends into the nozzle. The electrode head matches the inner bore contour of the nozzle, and there is a gap between them to meet the electrolyte flow space required for electrolytic processing. Furthermore, since the electrode plate extends into the housing through the cavity, it provides a return channel for the electrolyte, avoiding short circuits or corrosion caused by liquid accumulation in the processing area. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0020] Figure 2 This is a schematic diagram of the main components in this utility model;

[0021] Figure 3 This is a cross-sectional view of the main components of this utility model;

[0022] Figure 4 This is a schematic diagram of the control component in this utility model;

[0023] Figure 5 This is a schematic diagram of the electrode assembly in this utility model.

[0024] In the diagram: 1. Base; 2. Tooling mechanism; 21. Main component; 211. Housing; 212. Guide seat; 213. Positioning pin; 214. Protruding rod; 215. Ring; 216. Guide groove; 217. Gear ring; 218. Shaft lug; 219. Gear; 2110. Cavity; 22. Control component; 221. Mounting bracket; 222. Guide rail; 223. Rack; 224. Extension lug; 225. Threaded seat; 226. Knob screw; 23. Electrode assembly; 231. Electrode plate; 232. Electrode head. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. 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.

[0026] Please see Figure 1 - Figure 5 This utility model provides a technical solution: a tooling for electrolytic machining of the inner hole of a silicon nitride ceramic nozzle, including a base 1, on which a tooling mechanism 2 is provided for nozzle positioning, the tooling mechanism 2 including:

[0027] The main component 21 includes several housings 211 fixed to the top of the base 1. Four guide seats 212 are fixed inside the housings 211. A positioning pin 213 is slidably installed inside the guide seats 212. A protruding rod 214 is fixed inside the positioning pin 213. A ring 215 is installed inside the housings 211. Four guide grooves 216 are opened inside the ring 215, and the protruding rod 214 is located inside the guide grooves 216.

[0028] Control component 22 is mounted on base 1 and is used to control the positioning of nozzle by main body component 21;

[0029] The electrode assembly 23 includes an electrode sheet 231 fixed to the top of the base 1. Several electrode heads 232 are fixed to the top of the electrode sheet 231, and the electrode heads 232 are located at the center inside the housing 211.

[0030] In this embodiment, after the nozzle is placed inside the housing 211, the electrode head 232 extends into the nozzle. The electrode head 232 matches the inner bore contour of the nozzle, and there is a gap between them to meet the electrolyte flow space required for electrolytic processing. When the ring 215 rotates, the guide groove 216 cooperates with the protrusion 214 to drive the positioning pin 213 to slide along the inside of the guide seat 212, thereby realizing automatic centering and clamping of the nozzle, making the inner bore of the nozzle and the electrode head 232 coaxial, and ensuring the uniformity of electrolytic processing.

[0031] Specifically, the main component 21 also includes a gear ring 217 fixed to the outer wall of the ring 215, and a shaft lug 218 fixed to the outer wall of the housing 211. A gear 219 is rotatably installed inside the shaft lug 218 and meshes with the gear ring 217 for transmission.

[0032] In this embodiment, when the rack 223 moves, the gear 219, in conjunction with the gear ring 217, drives the ring 215 to rotate.

[0033] Specifically, the control component 22 includes a mounting bracket 221 fixed to the top rear end of the base 1. A guide rail 222 is fixed to the upper end of the mounting bracket 221. A rack 223 is slidably installed inside the guide rail 222 and meshes with a gear 219 for transmission.

[0034] In this embodiment, the movement trajectory of the rack 223 is constrained by the guide rail 222 to eliminate radial wobble, ensure that the gear 219 meshes without backlash, and improve the positioning repeatability accuracy.

[0035] Specifically, the control component 22 also includes an extension ear 224 fixed to one side of the rear end of the rack 223, a threaded seat 225 fixed to one end of the mounting bracket 221, a knob screw 226 installed inside the threaded seat 225 with through threads, and the knob screw 226 is rotatably connected to the extension ear 224.

[0036] In this embodiment, rotating the knob screw 226 in conjunction with the extension lug 224 drives the rack 223 to slide along the inside of the guide rail 222.

[0037] Specifically, the main component 21 also includes four cavities 2110 distributed circumferentially at the lower end of the housing 211.

[0038] In this embodiment, the electrode sheet 231 can extend into the housing 211 through the cavity 2110 and provide a return channel for the electrolyte, thus preventing liquid accumulation in the processing area from causing short circuits or corrosion.

[0039] Specifically, both gear ring 217 and gear 219 are made of polyetheretherketone (PEEK).

[0040] In this embodiment, it has excellent corrosion resistance, self-lubrication and insulation properties, and can work stably in the electrolytic processing environment for a long time without maintenance and without generating stray current corrosion.

[0041] The working principle and usage process of this utility model are as follows: First, after the nozzle is placed inside the housing 211, the electrode head 232 extends into the nozzle. The electrode head 232 matches the inner hole contour of the nozzle, and there is a gap between them to meet the electrolyte flow space required for electrolytic processing. Furthermore, since the electrode plate 231 extends into the housing 211 through the cavity 2110, it provides a return channel for the electrolyte, avoiding short circuits or corrosion caused by liquid accumulation in the processing area.

[0042] Then, by rotating the knob screw 226 in conjunction with the extension lug 224, the rack 223 is driven to slide along the inside of the guide rail 222. When the rack 223 moves, the gear 219 in conjunction with the gear ring 217 drives the ring 215 to rotate. When the ring 215 rotates, the guide groove 216 in conjunction with the protrusion 214 drives the positioning pin 213 to slide along the inside of the guide seat 212, thereby achieving automatic centering and clamping of the nozzle, making the nozzle inner hole coaxial with the electrode head 232, and ensuring the uniformity of electrolytic processing.

[0043] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0044] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A tooling for electrolytic machining of the inner hole of a silicon nitride ceramic nozzle, comprising a base (1), characterized in that: The base (1) is provided with a tooling mechanism (2) for nozzle positioning. The tooling mechanism (2) includes: The main body component (21) includes several housings (211) fixed to the top of the base (1). Inside the housing (211) are four guide seats (212) arranged in a circle. Inside the guide seats (212) are slidably mounted a positioning pin (213). Inside the positioning pin (213) are a protruding rod (214). Inside the housing (211) is a ring (215). Inside the ring (215) are four guide grooves (216) arranged in a circle, and the protruding rod (214) is located inside the guide groove (216). A control component (22) is mounted on the base (1) and is used to control the positioning of the nozzle by the main body component (21); The electrode assembly (23) includes an electrode sheet (231) fixed to the top of the base (1), and a plurality of electrode heads (232) are fixed to the top of the electrode sheet (231), and the electrode heads (232) are located at the center inside the housing (211).

2. The electrolytic machining fixture for the inner hole of a silicon nitride ceramic nozzle according to claim 1, characterized in that: The main component (21) also includes a gear ring (217) fixed to the outer wall of the ring (215), and a lug (218) fixed to the outer wall of the housing (211). A gear (219) is rotatably installed inside the lug (218) and meshes with the gear ring (217) for transmission.

3. The electrolytic machining fixture for the inner hole of a silicon nitride ceramic nozzle according to claim 1, characterized in that: The control component (22) includes a mounting bracket (221) fixed to the top rear end of the base (1). A guide rail (222) is fixed to the upper end of the mounting bracket (221). A rack (223) is slidably installed inside the guide rail (222) and meshes with a gear (219) for transmission.

4. The electrolytic machining fixture for the inner hole of a silicon nitride ceramic nozzle according to claim 3, characterized in that: The control component (22) also includes an extension ear (224) fixed to one side of the rear end of the rack (223), and a threaded seat (225) fixed to one end of the mounting bracket (221). A knob screw (226) is installed inside the threaded seat (225) with a through thread, and the knob screw (226) is rotatably connected to the extension ear (224).

5. The electrolytic machining fixture for the inner hole of a silicon nitride ceramic nozzle according to claim 1, characterized in that: The main component (21) also includes four cavities (2110) distributed circumferentially at the lower end of the housing (211).

6. The electrolytic machining fixture for the inner hole of a silicon nitride ceramic nozzle according to claim 2, characterized in that: The gear ring (217) and gear (219) are both made of polyetheretherketone (PEEK).

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