Processing method of air-electric dual-function connecting seat

Abstract

The present application relates to a kind of processing methods of gas-electric dual-function connecting seat, belong to composite precision forming technical field, solve the problem that existing connecting seat cannot satisfy the use demand of pipeline with dual function of aeration and power supply.The processing method of the gas-electric dual-function connecting seat, comprising the following steps: step 1: processing the connecting body of connecting seat and the protrusion on the one end of connecting body;Step 2: processing the through hole on connecting body;Step 3: processing the second groove on both sides of connecting body, the opening slot on protrusion and the first groove on connecting body.The present application realizes the diversification of pipeline function, and a pipeline has both aeration function and power supply function.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of precision forming, and particularly relates to a processing method of a gas-electric dual-function connecting seat. BACKGROUND

[0002] With the development of aerospace technology, miniaturization and structural weight reduction become more and more important, and the corresponding cabin space becomes more and more narrow, so it is required to prepare a pipeline capable of outputting an electric signal and having a ventilation function in a narrow space.

[0003] The existing pipeline has a single function, and a ventilation pipeline and an electric signal pipeline are arranged separately, so that the use demand in a narrow cabin cannot be met. Moreover, the existing connecting seat cannot meet the use demand of the pipeline having the ventilation and electric dual functions. SUMMARY

[0004] In view of the above analysis, the present application aims to provide a processing method of a gas-electric dual-function connecting seat, so as to solve the problem that the existing connecting seat cannot meet the use demand of the pipeline having the ventilation and electric dual functions.

[0005] The main purpose of the present application is achieved by the following technical scheme:

[0006] On one hand, the present application provides a processing method of a gas-electric dual-function connecting seat, comprising the following steps:

[0007] Step 1: processing a connecting main body of the connecting seat and a protrusion at one end of the connecting main body;

[0008] Step 2: processing a through hole on the connecting main body;

[0009] Step 3: processing a second groove on both sides of the connecting main body, an opening groove on the protrusion and a first groove on the connecting main body.

[0010] Optionally, the step 2 comprises processing the through hole on the connecting main body based on an end face of the other end of the connecting main body.

[0011] Optionally, the step 1 further comprises processing external threads on the connecting main body.

[0012] Optionally, the step 3 and the step 2 are processed by using the same reference.

[0013] Optionally, the step 3 comprises the following steps:

[0014] Step 31: simultaneously processing the second groove on both sides of the connecting main body and two first opening grooves on the protrusion;

[0015] Step 32: processing two second opening grooves on the protrusion;

[0016] Step 33: Machining the first groove on the connecting body. Optionally, in step 32, the second opening groove is evenly distributed circumferentially.

[0017] Optionally, step 3 is performed by electrical discharge machining.

[0018] Optionally, the first groove is disposed on the end face of the connecting body, and the second groove is disposed on the side face of the connecting body; the first groove and the second groove are connected.

[0019] On the other hand, the present invention also provides a gas-electric dual-function connector, which is processed by the above-described processing method. The gas-electric dual-function connector includes a connecting body and a protrusion. The protrusion is used for limiting and is located at one end of the connecting body and is arranged circumferentially along the outer surface of the connecting body. The connecting body is used for venting and placing thermocouples. The protrusion has a radially opening groove for the thermocouple to pass through and for the installation of the gas-electric dual-function pipeline. The connecting body has a first groove and a second groove. The first groove is located on the end face of the body, and the second groove is located on the side face of the connecting body. The first groove and the second groove are connected.

[0020] Optionally, the connecting body is provided with an axial through hole for gas to pass through.

[0021] Furthermore, the present invention also provides a dual-function gas-electric pipeline, comprising the aforementioned connector, gas path body, sleeve assembly, thermocouple, connector nozzle, and electrical connector; one end of the gas path body is connected to the connector, and the other end is connected to the connector nozzle, for realizing gas flow in the pipeline; the thermocouple is fixed on the gas path body, and its free end is connected to the electrical connector, for realizing the energizing signal of the pipeline; the sleeve assembly is sleeved on the outside of the gas path body and the thermocouple, for protecting the gas path body and the thermocouple.

[0022] Optionally, the thermocouple is made of platinum-rhodium wire.

[0023] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0024] (1) This invention achieves the ventilation function of the pipeline by providing a first groove on the end face of the connecting body and a through hole along the axial direction of the connecting body, and by suspending the node of the thermocouple at the connection between the first groove and the through hole, allowing gas to enter the through hole and the gas passage body through the gap between the node and the connecting body. The installation of the thermocouple achieves the energizing function of the pipeline, thereby realizing the dual functions of ventilation and energizing.

[0025] (2) By providing a first groove on the end face of the connecting body and a second groove on the outer surface of the connecting body, and connecting the first groove and the second groove, the thermocouple can be placed in the first groove and the second groove in an orderly manner. On the one hand, this reduces the risk of short circuit caused by the thermocouple contacting other metals, and on the other hand, it reduces the overall volume of the pipeline.

[0026] (3) By spraying an insulating coating on the end face of the first groove, the present invention can prevent the connection body from conducting with the thermocouple.

[0027] (4) By setting a slot at the connection between the connecting body and the gas circuit body, the present invention can make the connection between the connecting body and the gas circuit body more secure.

[0028] (5) By providing an insulating part on the outside of the thermocouple, the present invention can make the thermocouple insulated from other metals in the pipeline, thereby enabling the thermocouple to transmit electrical signals and making the transmitted electrical signals clear and stable.

[0029] (6) The present invention can position and limit the main body of the sleeve on the cabin by setting a limiting sleeve outside the main body of the sleeve, thereby saving the internal space of the cabin. By reasonably setting the spacing between multiple limiting sleeves, other lines or components can pass through the gap between adjacent limiting sleeves, further saving the internal space of the cabin.

[0030] (7) In the forming method of the pipeline with dual functions of ventilation and power supply of the present invention, the first sleeve assembly and the second sleeve assembly are not bent and formed first and then put into the gas circuit body. Instead, the first sleeve assembly and the second sleeve assembly are bent and formed after being put into the gas circuit body. This reduces the damage to the insulation part outside the thermocouple during the process of putting into the first sleeve assembly and the second sleeve assembly, and can effectively ensure the insulation between the thermocouple and the rest of the metal parts of the pipeline, thereby improving the pass rate of the pipeline with dual functions of ventilation and power supply of the present invention.

[0031] (8) In the forming method of the pipeline with dual functions of ventilation and power supply of the present invention, an air tightness and / or insulation test is performed after each step of the operation, which can promptly identify problems and deal with them in a timely manner, thereby improving forming efficiency and forming qualification rate.

[0032] (9) The present invention addresses the problem that it is difficult to conduct a positive pressure airtightness test when a thermocouple is bonded in the second groove. By using a vacuum bag to conduct a negative pressure test, the airtightness test can be completed while protecting the thermocouple from damage.

[0033] (10) By setting the flow guide, the present invention restricts the airflow from entering through the through hole on the connecting body 1-1, thereby improving the ventilation effect; on the other hand, it can protect the thermocouple at the front end.

[0034] (11) By setting weak points, the present invention facilitates the breakage and detachment of the pipeline after it has completed its corresponding function.

[0035] (12) By setting up protective tooling, the present invention can effectively prevent breakage at weak points during subsequent turnover and processing.

[0036] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages will become apparent from the description or may be learned by practicing the invention. Attached Figure Description

[0037] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0038] Figure 1 This is a schematic diagram of the pipeline structure of the present invention, which has both ventilation and power supply functions;

[0039] Figure 2 This is a schematic diagram of the gas path assembly structure;

[0040] Figure 3 This is a schematic diagram of the first set of pipe assembly structure;

[0041] Figure 4 This is a schematic diagram of the second sleeve assembly structure;

[0042] Figure 5 A schematic diagram of a structure with a weak point (annular groove) on the main body of the gas passage;

[0043] Figure 6 To protect the schematic diagram of the tooling structure;

[0044] Figure 7 This is a schematic diagram of the flow guide structure;

[0045] Figure 8 This is a schematic diagram of the tool electrode structure of the present invention;

[0046] Figure 9 for Figure 8 Schematic diagram of the cross-section at point AA;

[0047] Figure 10 for Figure 8 Schematic diagram of the cross-section at point BB;

[0048] Figure 11 This is a schematic diagram of the structure when the center line of the discharge end of the tool electrode of the present invention coincides with the central axis of the inner cavity of the stainless steel tube;

[0049] Figure 12This is a schematic diagram of the structure when the center line of the tool electrode of the present invention deviates from the central axis of the inner cavity of the stainless steel tube;

[0050] Figure 13 This is a cross-sectional schematic diagram of the discharge end of the tool electrode of the present invention when it is fitted onto a stainless steel tube.

[0051] Figure 14 This is a schematic diagram of the trajectory of the center point O2 of the discharge end when the discharge end of the tool electrode moves eccentrically around the central axis of the inner cavity of the stainless steel tube in this invention.

[0052] Figure 15 This is a schematic diagram of the motion trajectory of any point O3 on the discharge end of the tool electrode when it moves eccentrically around the central axis of the inner cavity of the stainless steel tube in this invention.

[0053] Figure 16 This is a schematic diagram of the structure of the load-bearing component and the stainless steel tube of the present invention.

[0054] Figure 17 This is a schematic diagram of the annular groove in the stainless steel pipe of the present invention;

[0055] Figure 18 This is a schematic diagram of the structure of the equal-height positioning block, clamping plate and stainless steel tube in this invention.

[0056] Figure 19 This is a schematic diagram of the structure in which the auxiliary support block and the stainless steel pipe work together in this invention.

[0057] Figure label:

[0058] 1. Gas path assembly; 1-1. Connecting body; 1-2. Gas path body; 1-3. Through hole; 1-4. First groove; 1-5. Second groove; 1-6. First opening groove; 1-7. Protrusion; 2. First sleeve assembly; 2-1. First sleeve body; 2-2. First limiting sleeve; 2-3. Connecting sleeve; 3. Second sleeve assembly; 3-1. Second sleeve body; 3-2. Second limiting sleeve; 4. Thermocouple; 5. Connecting nozzle; 6. Electrical connector; 7. Weak point; 8. 8-1. Protective fixture; 8-2. Clamping component; 8-3. Anti-loosening component; 8-4. Through groove; 9. Guide component; 9-1. Guide body; 9-2. Guide cap; 9-3. Guide hole; 10. Tool electrode; 11. Worktable; 12. Height positioning block; 13. Auxiliary bearing block; 14. Clamping plate; 15. Transmission rod; 101. Discharge end; 102. Working end; 103. Non-working end; 104. Conductive end; 16. Machining direction; 17. Eccentric motion direction;

[0059] H1, wall thickness of the stainless steel pipe; H2, wall thickness of the annular groove; α, bevel angle; S 11 S 12 S13 S 14 1. Actual clearance values ​​between four points selected on the circular working end of the tool electrode and the outer end face of the stainless steel tube; S2. Machining clearance; O1. Center point of the discharge end; O2. Center point of the inner cavity of the stainless steel tube; O3. Points selected on the discharge end. Detailed Implementation

[0060] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0061] Example 1

[0062] One specific embodiment of the present invention discloses a pipe connector, such as... Figure 2 As shown, the pipe connector includes a connector body 1-1 for ventilation and placement of thermocouples and a protrusion 1-7.

[0063] The connecting body 1-1 has an axial through hole 1-3. One end of the connecting body 1-1 is connected to the gas passage body 1-2, and the other end has a first groove 1-4 for placing the thermocouple 4. The first groove 1-4 is in the shape of an "I" and its length is equal to the outer diameter of the connecting body 1-1. The through hole 1-3 communicates with the first groove 1-4.

[0064] In a preferred embodiment, the end face of the connecting body 1-1 with the first groove 1-4 is provided with an insulating coating to prevent the connecting body 1-1 from conducting with the thermocouple 4.

[0065] In addition, the connecting body 1-1 is provided with external threads for connection with other components (such as flow guides). The connecting body 1-1 is made of high-temperature resistant alloy material.

[0066] Furthermore, a second groove 1-5 for placing the thermocouple 4 is provided on the side of the connecting body 1-1. This second groove is parallel to the axial direction of the connecting body 1-1 and extends from one end of the connecting body 1-1 to the other end. There are two second grooves 1-5, both of which communicate with the first groove. The two second grooves are symmetrically arranged with respect to the through hole. The thermocouple 4 extends from the first groove 1-4 into the second groove 1-5, then approaches the gas passage body 1-2, is located on the outside of the gas passage body 1-2, and continues to extend along the length direction of the gas passage body 1-2.

[0067] A protrusion 1-7 is located at one end of the connecting body 1-1 and is circumferentially arranged along the outer surface of the connecting body 1-1. The protrusion serves as a limit to prevent over-tightening. The end of the connecting body 1-1 with the protrusion 1-7 is connected to the air passage body 1-2.

[0068] In one possible implementation, the protrusion 1-7 is provided with radially spaced openings. These openings are used for the passage of thermocouples and for pipe installation. Specifically, the openings include first openings 1-6 and second openings. There are two of each type of opening. The two first openings 1-6 and the two second openings are alternately and evenly distributed circumferentially. The two first openings 1-6 communicate with two second recesses to facilitate the passage of thermocouples 4. The two second openings are used for the overall installation of the pipe. Exemplarily, the protrusion 1-7 is a flange structure.

[0069] Example 2

[0070] Another specific embodiment of the present invention discloses a method for processing a pneumatic-electric dual-function connector, used for processing the connector of Embodiment 1, comprising the following steps:

[0071] Step 1: Use a lathe to machine the outline of the connector, namely the connector body, the protrusion at one end of the connector body, and the external thread on the connector body.

[0072] Step 2: Machining through holes on the connecting body.

[0073] Using the other end of the connecting body (i.e., the end face excluding the protruding end) as a reference, a through hole is machined on the connecting body by electrical discharge machining.

[0074] Step 3: Process the second grooves on both sides of the connecting body, the opening grooves on the protrusions, and the first groove on the connecting body, specifically including the following steps:

[0075] Using the same reference as step 2, i.e., still taking the other end of the connecting body (i.e., the end face excluding the protrusion) as the reference, firstly, the second grooves on both sides of the connecting body and the two first opening slots on the protrusion are machined simultaneously by electrical discharge machining; secondly, the two second opening slots on the protrusion are machined by electrical discharge machining; finally, the first groove on the connecting body is machined by electrical discharge machining.

[0076] During processing, the dimensional tolerances of the first and second grooves must be strictly controlled to ensure that the thermocouple with the insulating part (alumina ceramic) does not protrude out of the groove after it is placed.

[0077] Example 3

[0078] A specific embodiment of the present invention discloses a pipeline with dual functions of ventilation and power supply, such as... Figure 1As shown, the system includes a gas path assembly 1, a first sleeve assembly 2, a second sleeve assembly 3, a thermocouple 4, a connector 5, and an electrical connector 6. The gas path assembly 1 is connected to the connector 5 to allow gas to flow through the pipeline. The thermocouple 4 is fixed to the gas path assembly 1, and its free end is connected to the electrical connector 6 to provide an electrical signal for the pipeline. The first sleeve assembly 2 and the second sleeve assembly 3 are fitted over the gas path assembly 1 and the thermocouple 4 to protect them.

[0079] like Figure 2 As shown, the gas path assembly 1 includes a connecting seat and a gas path body 1-2 as described in Embodiment 1. The connecting seat includes a connecting body 1-1, which has an axial through hole 1-3. One end of the connecting body 1-1 is connected to the gas path body 1-2, and the other end has a first groove 1-4 for placing a thermocouple 4. The first groove 1-4 is in the shape of an "I" and its length is equal to the outer diameter of the connecting body 1-1. The through hole 1-3 communicates with the first groove 1-4.

[0080] The first sleeve assembly 2 and the second sleeve assembly 3 are both sleeved on the outside of the gas circuit body 1-2 and the thermocouple 4 to protect the gas circuit body 1-2 and the thermocouple 4, and the second sleeve assembly 3 is located downstream of the first sleeve assembly 2.

[0081] In a preferred embodiment, the end face of the connecting body 1-1 with the first groove 1-4 is provided with an insulating coating to prevent the connecting body 1-1 from conducting with the thermocouple 4.

[0082] A second groove 1-5 is provided on the side of the connecting body 1-1. This second groove is parallel to the axial direction of the connecting body 1-1 and extends from one end of the connecting body 1-1 to the other end. There are two second grooves 1-5, and both of them communicate with the first groove. The two second grooves are symmetrically arranged with respect to the through hole.

[0083] In one possible implementation, the connector further includes a protrusion 1-7 located at the end where the connecting body 1-1 connects to the air passage body 1-2. The protrusion 1-7 is circumferentially arranged along the outer surface of the connecting body 1-1. The connecting body 1-1 has external threads for connection with other components (e.g., flow guides). The protrusion serves as a stop to prevent over-tightening. The protrusion 1-7 has radially opening grooves.

[0084] Specifically, the opening groove includes a first opening groove 1-6 and a second opening groove. There are two of each type of opening groove. The two first opening grooves 1-6 and the two second opening grooves are alternately and evenly distributed circumferentially. The two first opening grooves 1-6 are respectively connected to two second recesses to facilitate the passage of the thermocouple 4. The two second opening grooves are used for the overall installation of the pipeline. For example, the protrusion 1-7 is a flange structure.

[0085] Furthermore, a welding slot (not shown in the figure) is provided at the connection between the connecting body 1-1 and the gas passage body 1-2. This design makes the welding between the connecting body 1-1 and the gas passage body 1-2 more reliable.

[0086] The other end of the gas passage body 1-2 is connected to the connecting nozzle 5. Specifically, the gas passage body 1-2 is a stainless steel pipe with a diameter of 2mm and a wall thickness of 0.5mm.

[0087] like Figure 3 As shown, the first sleeve assembly 2 includes a first sleeve body 2-1, a first limiting sleeve 2-2, and a connecting sleeve 2-3. The first sleeve body 2-1 is a hollow tube, which is fitted onto the outside of the gas path body 1-2 to protect the gas path body 1-2 and the thermocouple 4. The first limiting sleeve 2-2 is a hollow tube, which is fitted onto the outside of the first sleeve body 2-1 to position and limit the first sleeve body 2-1 on the cabin, thereby positioning and limiting the gas-electric dual-function pipeline on the cabin. Specifically, the bottom of the limiting portion of the first limiting sleeve 2-2 is coated and adhered to the cabin wall. The connecting sleeve 2-3 is fitted onto the outside of the first sleeve body 2-1, at one end of the first sleeve body 2-1, and is connected to the connecting body 1-1.

[0088] In a preferred embodiment, there are multiple first limiting sleeves 2-2, which are arranged sequentially along the length of the first sleeve body 2-1, with gaps between adjacent first limiting sleeves for installing and limiting other components, thereby achieving the purpose of making reasonable use of space and arranging components in an orderly manner. The size of the gaps can be determined according to the components that need to be installed and limited.

[0089] In one possible implementation, the first limiting sleeve 2-2 and the connecting sleeve 2-3 are fixedly connected to the first sleeve body 2-1. For example, by welding.

[0090] In addition, the connecting sleeve 2-3 is fixedly connected to the connecting body 1-1, thereby realizing the connection between the first sleeve assembly 2 and the gas circuit assembly 1.

[0091] In one specific embodiment, the first sleeve body 2-1 is a stainless steel pipe with a diameter of 5mm and a wall thickness of 0.8mm.

[0092] The second bushing assembly 3 is located downstream of the first bushing assembly 2 to achieve segmented protection. For example... Figure 4 As shown, it includes a second sleeve body 3-1 and a second limiting sleeve 3-2. The second sleeve body 3-1 is a hollow tube and is located outside the gas passage body 1-2 to protect the gas passage body 1-2 and the thermocouple 4. The second limiting sleeve 3-2 is a hollow tube and is fitted onto the outside of the second sleeve body 3-1 to limit the second sleeve body 3-1 to the cabin.

[0093] Specifically, the second sleeve body 3-1 is a stainless steel pipe with a diameter of 4mm and a wall thickness of 0.3mm.

[0094] The second limiting sleeve 3-2 is a stainless steel tube with a diameter of 5mm and a wall thickness of 0.5mm.

[0095] In a preferred embodiment, such as Figure 5 As shown, a weak point 7 is provided on the gas path body 1-2, between the first sleeve assembly 2 and the second sleeve assembly 3, to facilitate breakage and detachment of the pipeline after it has completed its function. Specifically, the weak point 7 is an annular groove arranged circumferentially along the outer surface of the gas path body 1-2, meaning that the wall thickness of the gas path body 1-2 at the location of the weak point is less than the wall thickness of the gas path body 1-2 without the weak point. For example, the wall thickness of the gas path body 1-2 without the weak point is 0.5 mm, while the wall thickness of the gas path body 1-2 with the weak point is 0.2 mm, and the depth of the annular groove is 0.3 mm.

[0096] Thermocouple 4 is used to transmit electrical signals and has a node on it for generating and transmitting electrical signals. An insulating part is fitted around the outside of thermocouple 4. Thermocouple 4 is wire-shaped, preferably platinum-rhodium wire. The node is located at the connection between the first groove and the through hole and is suspended. The advantage of this arrangement is that it allows gas to enter the through hole and the main gas path through the gap between the node and the connector, thus achieving the gas passage function.

[0097] In one possible configuration, thermocouples 4 located on either side of the node are fixed within two second grooves, with the free ends of thermocouples 4 connected to electrical connectors 6. Exemplarily, thermocouples 4 are fixed within the second grooves by adhesive bonding. The adhesive used may be J303 glue.

[0098] Specifically, the insulation material is alumina ceramic. The advantage of using alumina ceramic is that the pipeline of this invention is used in a high-temperature environment, and alumina has good high-temperature resistance and will not age due to high temperatures, thus providing excellent insulation.

[0099] In a preferred embodiment, the insulating portion includes multiple insulating units, which are arranged sequentially along the length of the thermocouple 4. This segmented arrangement facilitates subsequent bending and shaping of the pipeline and reduces the risk of damage to the insulating portion during bending. For example, each insulating unit is a hollow cylinder with a length of 5 mm, an inner diameter of 0.5 mm, and an outer diameter of 1 mm. The insulating unit is made of alumina ceramic.

[0100] Because the front end of the pneumatic circuit assembly is in a high-temperature environment, the connector at the front end of the pneumatic circuit assembly is made of high-temperature resistant alloy material, the main body of the pneumatic circuit is made of stainless steel, the circuit part uses thermocouples (platinum-rhodium wire) to transmit electrical signals, and the end uses an electrical connector to send electrical signals. Therefore, the circuit part and the pneumatic part must be insulated during the pipeline design and manufacturing process. At the same time, the pipeline components must have the ability to provide limiting and positioning assistance functions in a narrow chamber in order to meet the final use requirements.

[0101] In addition, the pipeline with dual functions of ventilation and power supply in this embodiment also includes a flow guide 9. This flow guide 9 is located at the end of the connecting body 1-1 where the first groove 1-4 is provided, and is used to guide airflow into the through hole of the connecting body 1-1. Figure 7 As shown, the flow guide 9 includes a flow guide body 9-1 and a flow guide cap 9-2 located at one end of the flow guide body 9-1.

[0102] The flow guide body 9-1 is cylindrical, and has a flow guide hole 9-3 that passes through the flow guide body 9-1 and the flow guide cap 9-2. The flow guide hole is axially oriented and is a through hole. The flow guide hole 9-3 has an internal thread to achieve a threaded connection with the connecting body 1-1. After the flow guide is installed on the connecting body 1-1, the end face of the flow guide cap 9-2 is higher than the end face of the connecting body 1-1 with the first groove, thus forming a flow guide channel. The gas first enters the flow guide channel and is then guided into the through hole of the connecting body 1-1.

[0103] Example 4

[0104] Another specific embodiment of the present invention discloses a method for forming a gas-electric dual-function pipeline, which is used to form the pipeline with dual functions of gas transmission and power transmission as in Embodiment 2.

[0105] Before forming the gas-electric dual-function pipeline, each component is first processed and formed, such as the connector, the first sleeve assembly, and the second sleeve assembly. After processing and forming each component, the entire gas-electric dual-function pipeline is not formed as a whole. Instead, the components are assembled first to ensure that they can be assembled smoothly before the entire gas-electric dual-function pipeline is formed as a whole.

[0106] For the processing of the connector, please refer to Embodiment 3. The forming of the first sleeve assembly 2 and the second sleeve assembly 3 will be described below.

[0107] The first sleeve assembly 2 is formed by the following method:

[0108] Step 1: Calculate the length of the first sleeve body 2-1, saw it to cut the material, and remove burrs from the flat end;

[0109] Step 2: Cut multiple first limit sleeves 2-2, saw them to cut them, and remove burrs from the flat end;

[0110] Step 3: Machining and forming connecting sleeves 2-3;

[0111] Step 4: Mark lines on the first sleeve body and use cold welding to weld multiple first limiting sleeves 2-2 and the first sleeve body 2-1 into a whole. When welding each first limiting sleeve, only four points are welded at the front, back, top, and bottom. The welding is sufficient. Control the welding current to avoid weld beads inside the first sleeve body 2-1 during welding.

[0112] Step 5: Fit the connecting sleeve onto one end of the first sleeve body and weld it; the welding method is the same as in Step 4.

[0113] The second sleeve assembly 3 is formed by the following method:

[0114] Step 1: Calculate the length of the second sleeve body 3-1, saw it to cut the material, and remove burrs from the flat end;

[0115] Step 2: Cut the second limiting sleeve 3-2 by wire cutting and remove burrs from the flat end;

[0116] Step 3: Place the second limiting sleeve 3-2 onto the second sleeve body 3-1 and weld it; note that during welding, because the pipe wall is too thin, it is easy to weld through the pipe wall, so a copper rod needs to be added inside.

[0117] The assembly method for a dual-function pneumatic and electrical pipeline includes the following steps:

[0118] Step 1: Connect the main body of the gas circuit to the connector to obtain the gas circuit assembly.

[0119] Step 2: Place the insulating part over the thermocouple and secure the thermocouple to the connector. Details are as follows:

[0120] Step 21: Place the thermocouple node at the connection point of the first groove and the through hole on the connecting body of the connector, and suspend it in the air;

[0121] Step 22: Place multiple insulating units onto the thermocouple in sequence to achieve the purpose of placing the insulating part onto the thermocouple;

[0122] Step 23: Fix the thermocouple into the second groove on the connecting body.

[0123] Step 3: Fit the sleeve assembly over the outside of the gas circuit body and the thermocouple, as follows:

[0124] Step 31: Fit the first sleeve assembly onto the outside of the gas circuit body and the thermocouple;

[0125] Step 32: Insert the second sleeve assembly into the outside of the gas circuit body and the thermocouple, downstream of the first sleeve assembly.

[0126] Furthermore, step 31 also includes: if any insulating unit is damaged during the process of fitting the first sleeve assembly, the damaged insulating unit is removed, and the subsequent insulating units are straightened and refitted.

[0127] Step 4: Connect the main body of the gas circuit to the connecting nozzle.

[0128] Step 5: Connect the free end of the thermocouple to the electrical connector to obtain a gas-electric dual-function pipeline.

[0129] The method for forming the gas-electric dual-function pipeline in this embodiment includes the following steps:

[0130] Step 1: Insert one end of the gas path body 1-2 into the welding slot of the connecting body 1-1, and weld them together using argon arc welding to form a single unit, thus obtaining the gas path assembly 1. During welding, a 10mm allowance is left between the gas path body 1-2 and the connecting body 1-1 to ensure the minimum pipe size meets the requirements for ventilation and forming functions.

[0131] Step 2: Weld the other end of the gas path body 1-2 to the connecting nozzle 5, and conduct a positive pressure airtightness test on the gas path assembly 1 to verify the airtightness of the weld between the connecting body 1-1 and the gas path body 1-2. After the airtightness is qualified, use a 0.5mm iron wire to check the weld for passability to ensure that the through hole on the connecting body can pass through after welding. After ensuring that the through hole on the connecting body can pass through after welding, remove the connecting nozzle 5 and the reserved excess to ensure smooth subsequent sleeve installation. If the airtightness is not qualified, find the cause until the airtightness is qualified.

[0132] Step 3: Fix the thermocouple.

[0133] An insulating coating is sprayed onto the end face of the connecting body 1-1 where the first groove 1-4 is located. The node of the thermocouple 4 is placed at the connection between the first groove 1-4 and the through hole 1-3 on the connecting body 1-1, and is suspended in the air. The insulating part is then fitted onto the thermocouple 4. Afterwards, the thermocouple 4 is glued and fixed to the first groove 1-4 and the second groove 1-5 using J303 adhesive. After bonding, the insulation between the thermocouple 4 and other metal parts of the pipeline is measured.

[0134] Step 4: After confirming that thermocouple 4 is insulated from other metal parts of the pipeline, insert the first sleeve assembly 2 onto the outside of the gas circuit body 1-2 and the thermocouple 4. Details are as follows:

[0135] Two people work together to straighten thermocouple 4 and slowly slide the first sleeve assembly 2 onto it. If any insulation unit on the outside of thermocouple 4 is found to be damaged during the sliding process, the first sleeve assembly 2 can be slowly removed to remove the damaged insulation unit. Then, the remaining insulation units should be straightened and re-slid on. Throughout the sliding process, thermocouple 4 must not be bent or damaged. After sliding, the resistance is measured to ensure the insulation between thermocouple 4 and other metal parts of the tubing. If insulation is not achieved, the first sleeve assembly 2 is removed and re-slid on. After confirming insulation, the first sleeve assembly 2 is welded to the connecting body 1-1. After welding, the resistance is measured again to confirm insulation. If insulation is still not achieved, the cause is investigated until insulation is achieved.

[0136] Step 5: Insert the second sleeve assembly 3 into the outside of the gas circuit body 1-2 and the thermocouple 4.

[0137] Downstream of pipe assembly 2. The precautions for fitting it in are the same as for fitting the first pipe assembly 2. After fitting, measure the resistance to ensure insulation between thermocouple 4 and the rest of the metal parts of the pipe. After confirming insulation, weld the second pipe assembly 3 to the connecting body 1-1. After welding, measure the resistance again to confirm insulation. If there is no insulation, find the cause until insulation is achieved.

[0138] Step 6: According to the design requirements, bend the first sleeve assembly 2 and the second sleeve assembly 3 into shape slowly and carefully. After bending, measure the resistance to ensure that the thermocouple 4 and the rest of the metal parts of the pipeline are insulated. Use J303 adhesive to bond and fix the first sleeve assembly 2 and the second sleeve assembly 3 together to obtain a pipeline with both pneumatic and electrical functions.

[0139] Step 7: Conduct an airtightness test on the pipeline with both pneumatic and electrical functions.

[0140] Since the thermocouple 4 is bonded to the second groove 1-5 of the connecting body 1-1 at this time, it is difficult to conduct a positive pressure airtightness test. In a preferred embodiment, all parts before the weld at the nozzle 5 can be inserted into the airtightness test piece, the opening is sealed with sealing putty, and the airtightness test is conducted by drawing a negative pressure. Specifically, the airtightness test piece can be a vacuum bag.

[0141] Step 8: Connect the free end of thermocouple 4 to electrical connector 6, measure the resistance, and ensure that thermocouple 4 and the rest of the metal parts of the pipeline are insulated.

[0142] Example 5

[0143] Another specific embodiment of the present invention provides a method for processing an annular groove, which is used to process the weak part of the gas-electric dual-function pipeline of Embodiment 2.

[0144] This embodiment uses electrical discharge machining to solve the problem of high-precision machining of annular grooves on ultra-thin and thin-walled tubular parts.

[0145] Specifically, the method includes using the working state of multiple electrical discharge machining points arranged around the circumference of the workpiece by the tool electrode to machine the annular groove on the surface to be machined.

[0146] Among them, the same EDM point includes working state and non-working state. When the distance between the EDM point and the surface to be processed is greater than the threshold, the EDM point is in non-working state.

[0147] When the distance between the EDM point and the surface to be processed is less than or equal to the threshold, the EDM point is in working state.

[0148] The threshold is the discharge distance between the EDM point that meets the processing requirements and the surface to be processed.

[0149] The discharge end 101 includes multiple electrical discharge machining points arranged around the circumference of the workpiece. These multiple electrical discharge machining points can be continuously and uninterruptedly distributed around the circumference of the workpiece, or they can be discontinuously distributed around the circumference of the workpiece, as long as they can achieve continuous machining and forming of the annular groove on the workpiece surface.

[0150] In one possible implementation, one end of the tool electrode 10 is annular, meaning that multiple electrical discharge machining points arranged circumferentially around the workpiece form a continuous annular shape, such as... Figures 8-13 As shown, the inner circle of the ring matches the shape of the annular groove, that is, the inner circle is convex and the annular groove is concave. The cross-sectional dimensions of the convex shape are the same as the cross-sectional shape of the concave shape. The other end of the tool electrode 10 is a conductive end 104, which is electrically connected to an output end of a power supply device installed on the machine tool to introduce current and transmit the current to the inner circle. At this time, the inner circle is a discharge end 101, so that the annular groove on the surface to be processed can be processed through the working state of multiple electrical discharge machining points arranged around the circumference of the workpiece by the discharge end 101.

[0151] In one possible implementation, the discharge end 101 is a rigid structure, fitted onto the outer end face of the gas path body 1-2. Specifically, the gas path body 1-2 is a stainless steel tube. During processing, the stainless steel tube is electrically connected to another output end of the power supply device, and the tool electrode 10 moves eccentrically around the central axis of the inner cavity of the stainless steel tube; wherein, during the eccentric movement of the tool electrode 10, the distance between the inner circular end face of the discharge end 101 and the end face to be processed of the stainless steel tube is constantly changing; when the distance between the EDM point and the surface to be processed is greater than a threshold, the EDM point is in a non-working state, and at this time, the EDM point is a non-working end 103; when the distance between the EDM point and the surface to be processed is less than or equal to the threshold, the EDM point is in a working state, and at this time, the EDM point is a non-working end 103. The EDM machining point is the working end 102. In this way, the working state and non-working state can be changed at the same EDM machining point. The working state of all EDM machining points can jointly realize the machining of the annular groove on the workpiece surface. That is to say, the position of the working end 102 changes continuously within the inner circular end face of the discharge end 101. The circular discharge end of the tool electrode moves eccentrically around the central axis of the inner cavity of the stainless steel tube. All working ends form a continuous annular discharge end around the workpiece. In this way, the discharge end 101 of the tool electrode 10 is avoided to be in a continuous machining state, thereby reducing the wear of the tool electrode 10.

[0152] Among them, the annular discharge end 101 of the tool electrode 10 includes several working ends 102 distributed in a ring. When the discharge end moves eccentrically around the central axis of the inner cavity of the stainless steel tube for processing, the several working ends 102 are in a non-synchronous and non-continuous processing state; and the processing trajectories of the several working ends together constitute the annular groove of the workpiece to be processed.

[0153] Specifically, after the tool electrode 10 moves eccentrically for one revolution, all end faces of the discharge end 101 participate in electrical discharge machining. That is, all working ends 102 constitute a complete discharge end 101, and the machining trajectory of all working ends 102 constitutes an annular groove of the stainless steel tube. Along the deflection direction of the tool electrode 10, the working ends 102 exhibit a "circular motion" phenomenon on the discharge end 101. That is, the position of the working ends 102 is different at different times. In this way, all working ends 102 are processed alternately and in an orderly manner. The machining direction 16 is the circumferential direction around the outer end face of the stainless steel tube, and the plane containing this circumferential direction is perpendicular to the central axis of the inner cavity of the stainless steel tube.

[0154] The criterion for determining whether the discharge end 101 is the working end 102 is whether the distance between the discharge end 101 and the surface to be processed of the stainless steel tube is greater than 50μm. If not, the discharge end 101 is the working end 102; if so, the discharge end 101 is the non-working end 103.

[0155] Specifically, the tool electrode 10 is mounted on a machine tool. During machining, the machine tool drives the tool electrode 10 to make an eccentric motion, thereby enabling the discharge end 101 of the tool electrode to perform electrical discharge machining around the end face of the stainless steel tube. The machining direction 16 is the circumferential direction around the outer end face of the stainless steel tube, and the center line of this circumferential direction coincides with the central axis of the inner cavity of the stainless steel tube.

[0156] Specifically, before the tool electrode 10 makes an eccentric movement, it is necessary to adjust the center of the inner circle of the discharge end 101 of the tool electrode 10 to coincide with the central axis of the stainless steel tube, and there should be a margin gap between the discharge end 101 and the outer end face of the stainless steel tube. That is, the diameter of the inner circle of the discharge end 101 is larger than the outer diameter of the stainless steel tube. For example, the diameter of the inner circle is 10 to 20 mm, which is 5 to 10 times the outer diameter of the stainless steel tube. In this way, it is easy to determine the value of the single-sided feed rate O1O2 during the electrical discharge machining process.

[0157] Among them, the unilateral feed rate O1O2 satisfies:

[0158] O1O2=S1+(H1-H2)-S2

[0159] Wherein, O1 represents the center point of the discharge terminal 101 of the tool electrode 10;

[0160] O2 indicates the center point of the inner cavity of the stainless steel pipe;

[0161] H1 is the wall thickness of the stainless steel pipe;

[0162] H2 is the wall thickness of the annular groove;

[0163] S1 indicates that there is a margin gap between the discharge terminal 101 and the outer end face of the stainless steel tube.

[0164] S2 is the machining clearance, which refers to the closest distance between the working end 102 and the end face of the stainless steel tube 01 when the tool electrode 10 moves eccentrically.

[0165] Wherein, S1 satisfies:

[0166]

[0167] Among them, S 11 S 12 S 13 S 14 The actual clearance value between four points selected on the discharge end 101 of the tool electrode 10 and the outer end face of the stainless steel tube is given. These four points are evenly distributed on the discharge end 101.

[0168] For example, S 11 S 12 S 13 S 14The corresponding values ​​are 2.055mm, 2.060mm, 2.065mm, and 2.050mm, respectively. At this time, S1 = 2.058mm.

[0169] The machining gap S2 is set to 10-50 μm to meet the requirements of electrical discharge machining.

[0170] For example, S2 = 10 μm; H1 = 0.5 mm, H2 = 0.3 mm, S1 = 2.058 mm, and O1O2 = 2.248 mm.

[0171] Among them, the automatic centering module on the machine tool can be used to measure S. 11 S 12 S 13 S 14 If the four values ​​are equal, the center of the inner circle of the discharge end 101 of the tool electrode 10 coincides with the central axis of the inner cavity of the stainless steel tube.

[0172] Among them, after the center of the discharge end 101 of the machine tool adjustment tool electrode 10 is aligned with the central axis of the inner cavity of the stainless steel tube, the actual measured S 11 S 12 S 13 S 14 The closer the four values ​​are, the more accurate the value of S1, and the more accurate the single-sided feed amount O1O2. In this way, the machining gap accuracy can be ensured during the eccentric movement of the tool electrode 10, thereby ensuring the machining depth of the working end 102 and ensuring the dimensional accuracy of the machined annular groove.

[0173] Specifically, after the center of the discharge end 101 of the adjustment tool electrode 10 is aligned with the central axis of the inner cavity of the stainless steel tube, the machine tool drives the tool electrode 10 to make an eccentric movement. The detailed process is as follows.

[0174] The movement trajectories of the center point O1 of the discharge terminal 101 of the tool electrode 10 and the center point O2 of the inner cavity of the stainless steel tube are described below:

[0175] Move the tool electrode 10 so that O1 moves away from O2. The moving distance is the same as the unilateral feed amount O1O2. At this time, the distance between O1 and O2 is O1O2.

[0176] With O2 as the center and O1O2 as the radius, rotate O1 around O2. The trajectory of O1's movement will then be a circle, as shown below. Figure 14 As shown, the center of the circle is O2, and the radius is O1O2;

[0177] During the movement of O1, when the closest distance between the end face of the discharge end 101 and the surface of the stainless steel tube reaches 10μm, the power supply device is turned on to deliver a pulse voltage to the tool electrode 10 and the stainless steel tube, and the metal on the surface of the stainless steel tube is etched away at a processing speed of 0.04g / min until the distance between O1 and O2 is O1O2, and then O1 moves in a circular motion around O2.

[0178] To further illustrate the motion trajectory of the tool electrode 10, an arbitrary point O3 on the discharge terminal 101 is selected, and the trajectory of O3 is used for illustration, as follows:

[0179] The movable tool electrode 10 causes O3 to move toward O2, with a moving distance of O1O2;

[0180] As O1 rotates around O2, at this time, as... Figure 15 As shown, the trajectory of O3 is a circle with the initial position of O3 as the center and O1O2 as the radius;

[0181] During the movement of O3, when the closest distance between the end face of the discharge end 101 and the surface of the stainless steel tube reaches 10μm, the power supply device is turned on to deliver a pulse voltage to the tool electrode 10 and the stainless steel tube, and the metal on the surface of the stainless steel tube is etched at a processing speed of 0.04g / min until the moving distance of O3 reaches O1O2. Then, O3 moves in a circle with its initial position as the center.

[0182] Thus, during the eccentric movement of the tool electrode 10, the distance between the inner circular end face of the discharge end 101 and the outer surface of the stainless steel tube changes continuously. The distance between each part of the inner circular end face of the discharge end 101 and the outer end face of the stainless steel tube changes from close to far away. Consequently, the discharge end 101 changes from the working state to the non-working state, that is, the dynamic transformation between the working end 102 and the non-working end 103 is realized.

[0183] The discharge end 101 has a clearance between itself and the outer end face of the stainless steel tube 01 to ensure that the non-working end 103 at the discharge end 101 and the end face of the stainless steel tube have a sufficiently large non-processing clearance, thereby ensuring that the pulse voltage released at the non-working end 103 cannot erode the metal on the surface of the stainless steel tube. Thus, when the tool electrode 10 moves eccentrically, the working end 102 and the non-working end 103 can be dynamically switched.

[0184] The conductive end 104 of the tool electrode 10 is electrically connected to one output end of the power supply device installed on the machine tool, and the stainless steel tube is electrically connected to the other output end of the power supply device. The power supply device includes a pulse power supply, and its two output ends are respectively connected to the positive and negative terminals of the pulse power supply to output pulse voltage.

[0185] During processing, the stainless steel tube and the discharge end 101 of the tool electrode 10 are immersed in a liquid medium with a certain degree of insulation, for example, kerosene, mineral oil, or deionized water; when a pulse voltage is applied to the discharge end 101 and the stainless steel tube, the liquid medium at the closest point between the stainless steel tube and the discharge end 101 under the given conditions is broken down, forming a discharge channel. Due to the very small cross-sectional area of ​​the channel and the extremely short discharge time, the energy is highly concentrated (10~10). 6 The instantaneous high temperature generated in the discharge area (W / mm) is sufficient to melt or even evaporate the metal on the surface of the stainless steel tube, resulting in a small pit. After the first pulse discharge ends, after a very short interval, the second pulse discharges at the closest point between the other electrodes. This process continues at a high frequency, and the tool electrode 10 continuously feeds into the stainless steel tube. Its shape is eventually replicated on the stainless steel tube, forming the required machining surface. During the machining process, although a small portion of the total energy is released onto the tool electrode 10, causing wear on the tool electrode 10, the working end 102 at the discharge end 101 is constantly changing position due to the eccentric movement of the discharge end 101 around the central axis of the inner cavity of the stainless steel tube. This reduces the wear on the tool electrode 10 by avoiding continuous machining of the working end 102. Consequently, at each moment of machining, the working end 102 of the discharge end 101 maintains a relatively complete shape, improving machining accuracy.

[0186] For example, during the processing, the electrical parameters satisfy:

[0187] Pulse width 30–60 μs, pulse interval 20–30 μs, average machining current 0.8–2 A, average machining voltage 30–60 V.

[0188] Specifically, during processing, the stainless steel tube remains stationary while the tool electrode 10 is moved eccentrically by the machine tool control.

[0189] The tool electrode 10 is connected to a drive device installed on the machine tool. The drive device includes a transmission rod 15. During processing, the machine tool controls the transmission rod 15 to swing, thereby driving the tool electrode 10 to make an eccentric motion through the transmission rod 15.

[0190] Specifically, the transmission rod 15 swings clockwise in the swing plane ZY, which is parallel to the plane where the discharge end 101 is located, thereby realizing the eccentric movement of the tool electrode 10 around the central axis of the inner cavity of the stainless steel tube.

[0191] For example, during the processing, the non-electrical parameters satisfy:

[0192] The swing speed of the transmission rod 15 is 0.4 to 0.6 rpm, the machining gap is 10 to 50 μm, the machining speed is 0.02 to 0.045 g / min, and the single-sided feed rate is 2.214 to 2.316 mm.

[0193] Specifically, such as Figure 16 As shown, the stainless steel pipe is placed on the level positioning block 12 and the auxiliary bearing block 13 to clamp the stainless steel pipe.

[0194] Two equal-height positioning blocks 12 are used to clamp the stainless steel tube on both sides of the position to be processed, so as to ensure the stability of the position of the stainless steel tube during processing. For example, the distance between the two equal-height positioning blocks 12 is 30mm.

[0195] Two equal-height positioning blocks 12 are placed between two auxiliary bearing blocks 13. The two auxiliary bearing blocks 13 are used to support and position the two ends of the stainless steel pipe, further ensuring the stability of the stainless steel pipe during processing.

[0196] Among them, such as Figures 18-19 As shown, the upper surfaces of the equal-height positioning block 12 and the auxiliary support block 13 are flush, and V-shaped grooves are provided on the upper surfaces of the equal-height positioning block 12 and the auxiliary support block 13. The stainless steel tube is placed in the V-shaped groove to limit the movement of the stainless steel tube.

[0197] Furthermore, the clamping plate 14 is placed over the V-groove and engaged with the leveling block 12 to limit the movement of the stainless steel tube, thereby further improving its stability. For example, the V-groove has an angle of 60°-90° and a depth of 5-10mm.

[0198] Before placing the stainless steel tube on the leveling block 12, the tool electrode 10 needs to be aligned using a machine tool. Then, the stainless steel tube is inserted into the discharge end 101 of the tool electrode 10. Finally, the stainless steel tube is clamped using the leveling block 12, the auxiliary support block 13, and the clamping plate 14, and the stainless steel tube is aligned using the leveling block 12 and the auxiliary support block 13.

[0199] Specifically, after the tool electrode 10 is aligned, the position of the equal height positioning block 12 and the auxiliary bearing block 13 on the machine tool is adjusted using the XYZ axis of the machine tool to align the stainless steel tube, ensuring that the central axis of the inner cavity of the stainless steel tube coincides with the center line of the discharge end 101 of the tool electrode 10, so as to determine the value of the single-sided feed amount O1O2, thereby improving the machining accuracy.

[0200] The alignment process for the stainless steel pipe is as follows.

[0201] First, fix two equal-height positioning blocks 12 and two auxiliary bearing blocks 13 on the machine tool's worktable 9. Then, use a dial indicator to align their sides with the machine tool's X-axis, with a parallelism error ≤ 0.01mm.

[0202] Before placing the stainless steel tube on the leveling block 12, the stainless steel tube is first inserted into the discharge end 101 of the tool electrode 10, and then the stainless steel tube is placed on the leveling block 12 and the auxiliary support block 13. In this way, the leveling block 12 and the auxiliary support block 13 are used to align the stainless steel tube.

[0203] One end of the transmission rod 15 is connected to the tool electrode 10 and is parallel to the center line of the discharge end 101 of the tool electrode 10. During the processing, the other end of the transmission rod 15 is mounted on the machine tool so that the machine tool drives the transmission rod 15 to swing, thereby driving the tool electrode 10 to move, so that the discharge end 101 of the tool electrode 10 can make an eccentric movement around the central axis of the inner cavity of the stainless steel tube.

[0204] In this way, the discharge end 101 of the tool electrode 10 moves eccentrically around the central axis of the inner cavity of the stainless steel tube for one revolution, thus completing the processing of the annular groove of the stainless steel tube, achieving one-time processing and significantly improving processing efficiency.

[0205] Compared with the prior art, the discharge end 101 of the tool electrode 10 of the present invention includes a plurality of electrical discharge machining points arranged circumferentially around the workpiece. The same electrical discharge machining point includes a working state and a non-working state. When the tool electrode performs electrical discharge machining on the annular groove of the workpiece, the distance between the electrical discharge machining point and the surface to be machined changes continuously, realizing the transition between the working state and the non-working state. The working state of the plurality of electrical discharge machining points arranged circumferentially around the workpiece realizes the machining of the annular groove on the surface to be machined. In this way, the discharge end 101 of the tool electrode 10 is avoided from being in a continuous machining state, thereby reducing the wear and tear on the tool electrode 10.

[0206] Multiple electrical discharge machining (EDM) points arranged circumferentially around the workpiece form a continuous ring. The inner end of the ring matches the shape of the annular groove and moves eccentrically on the outer end face of the stainless steel tube. During this process, the distance between the inner end face of the discharge end 101 and the surface to be machined is constantly changing. When the inner end face of the discharge end 101 is close to the surface to be machined, the end face of the discharge end 101 is the working end 102. When the end face is far away from the surface to be machined, the end face transforms into the non-working end 103. This achieves dynamic transformation between the working end 102 and the non-working end 103, thereby avoiding the working end 102 of the tool electrode 10 being in a continuous machining state, greatly reducing the wear on the working end 102 of the tool electrode 10, achieving a wear of ≤1% for the tool electrode 10, and further reducing the deformation of the working end face of the tool electrode 10, thereby improving the machining accuracy of the annular groove of the stainless steel tube.

[0207] The discharge end 101 of the tool electrode 10 of the present invention is fitted onto an ultra-thin stainless steel tube and moves eccentrically. During processing, the distance between the discharge end 101 and the ultra-thin stainless steel tube decreases and then increases. During the process of decreasing distance, metal debris is generated between the discharge end 101 and the stainless steel tube. At this time, some of the metal debris is discharged with the working fluid through the processing gap. During the process of increasing distance, the distance between the discharge end 101 and the stainless steel tube can increase by nearly 200 times, which significantly improves the efficiency of metal debris discharge. This avoids the accumulation of metal debris at the discharge end 101 due to untimely discharge, thereby reducing the wear of the tool electrode 10 and avoiding the risk of short circuit caused by direct connection between the tool electrode 10 and the stainless steel tube through metal debris.

[0208] By having the discharge end 101 of the tool electrode 10 made eccentric movement on the ultra-thin stainless steel tube, metal chips can be efficiently discharged, thereby enabling electrical discharge machining with a smaller machining gap. This reduces the machining current and voltage, lowers machining costs, and produces annular grooves with lower surface roughness.

[0209] like Figure 17 As shown, by adjusting the value of the single-sided feed, annular grooves with different wall thicknesses can be processed. By adjusting the shape of the discharge end 101 of the tool electrode 10, different angle α can be processed, laying the foundation for rapid production and mass production of products.

[0210] The discharge end 101 of the tool electrode 10 of the present invention can complete the processing of the annular groove of the ultra-thin stainless steel tube by eccentrically moving around the central axis of the inner cavity of the ultra-thin stainless steel tube once, thus achieving one-time processing and significantly improving processing efficiency.

[0211] By eccentrically moving the discharge end 101 of the tool electrode 10 around the central axis of the inner cavity of the stainless steel tube, the single-sided feed amount of each end face of the discharge end 101 can be made the same, ensuring the consistency of the machining depth of the annular groove, thereby improving the machining accuracy of the annular groove.

[0212] The discharge end 101 of the tool electrode 10 has the same shape as the annular groove, that is, the discharge end 101 is convex and the annular groove is grooved. The cross-sectional dimensions of the convex shape are the same as the cross-sectional shape of the groove. Thus, after the discharge end 101 of the tool electrode 10 moves eccentrically around the central axis of the inner cavity of the ultra-thin stainless steel tube for one revolution, the depth and angle of the processed annular groove are the required depth and angle of the annular groove, and the processing accuracy is significantly improved.

[0213] This invention abandons the traditional turning process for ultra-thin stainless steel tubes. It uses the working end 102 of the tool electrode 10 to discharge and erode the metal on the surface of the ultra-thin stainless steel tube to perform annular groove processing. That is, during the processing, the tool electrode 10 does not contact the surface of the ultra-thin stainless steel tube, so it will not cause deformation and overcomes the problem of damage to the ultra-thin stainless steel tube by cutting force.

[0214] This invention utilizes the eccentric movement of the discharge end 101 of the tool electrode 10 around the central axis of the inner cavity of the ultra-thin stainless steel tube to process the annular groove of the ultra-thin stainless steel tube. That is, during the processing, the ultra-thin stainless steel tube does not need to move, and an annular groove in the shape of a ring can be processed on its outer surface. This overcomes the problem that the coaxiality of the ultra-thin stainless steel tube deteriorates during the rotation process, which affects the processing accuracy.

[0215] During processing, the ultra-thin stainless steel tube is simply placed in the V-shaped groove on the equal height positioning block 12 and the auxiliary bearing block 13, and the upper surface of the ultra-thin stainless steel tube is limited by the clamping plate 14. This allows for the clamping and positioning of the ultra-thin stainless steel tube, which is convenient and ensures the stability of the ultra-thin stainless steel tube during processing.

[0216] The specific steps are as follows:

[0217] Step 1: Use the machine tool to adjust the position of the tool electrode 10 so that the plane where the discharge end 101 of the tool electrode 10 is located is perpendicular to the worktable surface 11 of the machine tool;

[0218] Specifically, the machine tool's worktable 11 is horizontal, and the tool electrode 10 is vertically mounted on the machine tool and connected to the transmission rod mounted on the machine tool.

[0219] Step 2: Use the bearing assembly to clamp the air passage body 1-2 and align the air passage body 1-2;

[0220] Specifically, the main body of the air circuit 1-2 is a stainless steel pipe. First, fix two equal height positioning blocks 12 and two auxiliary bearing blocks 13 on the worktable 11. Use a dial indicator to align their sides parallel to the X-axis of the machine tool. Then, use the machine tool to adjust the position of the equal height positioning blocks 12 and auxiliary bearing blocks 13. The parallelism error should be ≤0.01mm.

[0221] Then place the stainless steel tube on the leveling block 12. Before placing it, pass the stainless steel tube through the inner circle of the lower end of the tool electrode 10. Use the leveling block 12 to ensure that the stainless steel tube is in a horizontal position. The distance between the two leveling blocks 12 is 30mm.

[0222] Next, place both ends of the stainless steel pipe on the auxiliary support block 13, and finally fix it with the clamping plate 14.

[0223] Step 3: Use the machine tool to adjust the center line of the discharge end 101 of the tool electrode 10 to coincide with the central axis of the inner cavity of the stainless steel tube;

[0224] Specifically, the position of the stainless steel tube is first adjusted by moving the bearing component upward along the X-axis of the machine tool so that the processing position of the stainless steel 6 is located within the discharge end 101 of the tool electrode 10.

[0225] Next, the S is measured using the machine tool's automatic centering module. 11 S 12 S 13 S 14 If the four values ​​are equal or the error is within ±0.02mm, then the center of the discharge end 101 of the tool electrode 10 is aligned with the central axis of the inner cavity of the stainless steel tube. If they are not aligned, the position of the bearing component is adjusted by the machine tool until the requirements are met.

[0226] Step 4: Using kerosene and water as the working fluid, perform electrical discharge machining on the stainless steel tube using the tool electrode 10 in the working fluid.

[0227] Specifically, step 4 includes the following steps:

[0228] Step 41: Control the discharge end 101 of the tool electrode 10 to move eccentrically around the central axis of the inner cavity of the stainless steel tube;

[0229] Specifically, the machine tool drives the transmission rod 15 to swing in the YZ plane, thereby controlling the discharge end 101 of the tool electrode 10 to perform eccentric motion around the central axis of the inner cavity of the stainless steel tube via the transmission rod 15. The direction of eccentric motion 17 is shown in the figure. Figure 14 .

[0230] The swing speed of the transmission rod 15 is 0.5 rpm;

[0231] S 11 S12 S 13 S 14 The actual measured values ​​were 2.055mm, 2.060mm, 2.065mm, and 2.050mm, respectively. At this time, S1 = 2.058mm.

[0232] The machining clearance S2 is 10 μm;

[0233] Single-sided feed rate O1O2=S1+(H1-H2)-S2=2.058+(0.5-0.3)-0.01=2.248mm;

[0234] The processing speed is 0.04 g / min.

[0235] Step 42: When the tool electrode 10 is in eccentric motion, energize the tool electrode 10 to perform electrical discharge machining.

[0236] Specifically, the electrical parameters satisfy:

[0237] Pulse width 40μs, pulse interval 26μs, average machining current 1A, average machining voltage 40V.

[0238] The above processing method was used to process annular grooves on ultra-thin stainless steel tubes #01-#10. The processing parameters are shown in Table 1 below.

[0239] Table 1 Processing Parameters

[0240]

[0241] Processing requirements: The wall thickness of the annular groove is 0.3±0.05mm, and the chamfer angle α is 90°.

[0242] The test results are shown in Table 2 below.

[0243] Table 2 Detection Results

[0244]

[0245] The electrode consumption ratio is E / W*100%, where E is the change in the diameter of the discharge end of the tool electrode, and W is the initial diameter of the inner end of the tool electrode.

[0246] As shown in Table 2, the average groove depth of the annular grooves on the 10 stainless steel tubes processed by this invention is 0.2146 mm, with a standard deviation of 0.01427 and a coefficient of variation of 0.07. The annular groove angle is 90°. The average wall thickness of the annular groove is 0.299 mm, with a standard deviation of 0.006681 and a coefficient of variation of 0.02. It can be seen that the processing method of this invention can realize the processing of annular grooves on ultra-thin stainless steel tubes, and the processed annular grooves have high precision and stability, will not damage the ultra-thin stainless steel tubes, and have low wear on the tool electrode.

[0247] A diameter-to-length ratio of 1:100–150 generally qualifies as an ultra-slender shaft. For example, a stainless steel tube used in a certain aircraft product has an outer diameter of 2mm, an inner diameter of 1mm, and a length of 1–1.2m. This stainless steel tube has an outer diameter-to-length ratio of 1:500–600, classifying it as an ultra-slender stainless steel tube. Generally, an annular groove needs to be machined on this ultra-slender steel tube. This annular groove is a ring-shaped recess used to separate the aircraft product's guidance system from the fairing body when the product reaches a predetermined altitude and position.

[0248] Because of the small diameter and thin wall thickness of ultra-thin stainless steel tubes, and the even thinner wall thickness at the annular groove position (e.g., 0.3±0.05mm), it is impossible to determine their important dimensions through direct measurement. When machining a V-shaped annular groove at a certain position of an ultra-thin stainless steel tube, it is difficult to guarantee the wall thickness at the annular groove position using traditional turning methods. This is because the excessive length will cause a greater centrifugal force during the rotation of the workpiece, resulting in poorer coaxiality of the workpiece, and the cutting force generated will easily cause deformation of the ultra-thin stainless steel tube.

[0249] When using existing electrical discharge machining (EDM) equipment to process annular grooves on ultra-thin stainless steel tubes, the ultra-thin stainless steel tube needs to be rotated, and then the tool electrode is used to continuously advance on the surface of the ultra-thin stainless steel tube for processing. However, due to the length of the ultra-thin stainless steel tube, the centrifugal force caused by the rotation of the workpiece during the rotation process will be greater, and the coaxiality of the workpiece will be worse. Similarly, it will be difficult to guarantee the wall thickness at the position of the annular groove. Moreover, during the processing, part of the total energy is released to the tool electrode, which will cause tool wear. The shape of the worn tool electrode is eventually replicated on the ultra-thin stainless steel tube, which seriously affects the processing accuracy of the annular groove.

[0250] Because the wall thickness of the annular groove is thin, the requirements for positioning and machining accuracy are relatively high, and its important dimensions cannot be obtained by direct measurement. When machining an annular groove at a certain position of an ultra-thin stainless steel tube, it is difficult to guarantee the wall thickness of the annular groove using traditional turning equipment. Even with existing electrical discharge machining equipment, it is difficult to guarantee the wall thickness of the annular groove.

[0251] The aforementioned annular groove is formed using the following machining apparatus. This apparatus includes a tool electrode 10 mounted on a machine tool, a support assembly, and a drive assembly. The support assembly is used to clamp the stainless steel tube, and the drive assembly is used to drive the tool electrode 10 to move eccentrically around the central axis of the inner cavity of the stainless steel tube, thereby realizing electrical discharge machining of the annular groove on the stainless steel tube and solving the problem of the difficulty in machining annular grooves on ultra-slender stainless steel tubes.

[0252] Specifically, one end of the tool electrode 10 is annular, with the inner end of the annular circle matching the shape of the annular groove. The other end of the tool electrode 10 is a conductive end 104, electrically connected to an output end of a power supply device installed on the machine tool to introduce current and transmit it to the inner end. At this time, the inner end is the discharge end 101, which is fitted onto the outer end face of the stainless steel tube. During processing, the stainless steel tube is electrically connected to the other output end of the power supply device, and the discharge end 101 of the tool electrode 10 moves eccentrically around the central axis of the inner cavity of the stainless steel tube. During the eccentric movement of the tool electrode 10, the distance between the end face of the discharge end 101 and the end face of the stainless steel tube to be processed changes continuously. A distance of 10-50 μm indicates the working state, i.e., the working end 102, while a distance greater than 50 μm indicates the non-working state, i.e., the non-working end 103. The processing trajectories of all working ends 102 together constitute the annular groove of the ultra-slender stainless steel tube.

[0253] The center of the inner circle of the discharge end 101 of the tool electrode 10 coincides with the central axis of the inner cavity of the stainless steel tube, and there is a margin gap between the discharge end 101 and the outer end face of the stainless steel tube. The diameter of the end face of the discharge end 101 is 20mm, which is 10 times the outer diameter of the stainless steel tube, so as to facilitate the determination of the value of the single-sided feed amount O1O2. During processing, the tool electrode 10 is driven to swing by the drive assembly. At this time, the discharge end 101 of the tool electrode 10 is in an eccentric motion state around the central axis of the inner cavity of the stainless steel tube.

[0254] Among them, the automatic centering module on the machine tool is used to measure S. 11 S 12 S 13 S 14 The corresponding values ​​are 2.055mm, 2.060mm, 2.065mm, and 2.050mm, respectively. At this time, S1 = 2.058mm.

[0255] Where S2 = 10 μm; H1 = 0.5 mm, H2 = 0.3 mm, S1 = 2.058 mm, and O1O2 = 2.248 mm.

[0256] When the center of the discharge end 101 of the adjustment tool electrode 10 coincides with the central axis of the inner cavity of the stainless steel tube, the tool electrode 10 is in an eccentric motion state under the action of the drive assembly.

[0257] The conductive end 104 of the tool electrode 10 is electrically connected to one output end of the power supply device installed on the machine tool, and the stainless steel tube is electrically connected to the other output end of the power supply device. The power supply device includes a pulse power supply, and its two output ends are respectively connected to the positive and negative terminals of the pulse power supply to output pulse voltage.

[0258] During the processing, the electrical parameters must meet the following requirements:

[0259] Pulse width 40μs, pulse interval 26μs, average machining current 1A, average machining voltage 40V.

[0260] Specifically, the aforementioned drive assembly includes a transmission rod 15, one end of which is connected to the tool electrode 10, and the other end of which is mounted on a machine tool. The machine tool can control the transmission rod 15 to swing, thereby causing the discharge end 101 of the tool electrode 10 to move eccentrically around the central axis of the inner cavity of the stainless steel tube. During processing, the stainless steel tube remains stationary.

[0261] During the processing, the non-electrical parameters satisfy the following:

[0262] The swing speed of the transmission rod 15 is 0.5 rpm, the machining gap S2 is 10 μm, the machining speed is 0.04 g / min, and the single-sided feed rate O1O2 is 2.248 mm.

[0263] Specifically, the support assembly includes a height positioning block 12 and an auxiliary support block 13 mounted on the machine tool to place the stainless steel tube on the height positioning block 12 and the auxiliary support block 13 to clamp the stainless steel tube.

[0264] The system includes two equal-height positioning blocks 12, which are located on both sides of the stainless steel pipe to be processed, with a distance of 30mm between them.

[0265] The system includes two auxiliary support blocks 13 and two equal-height positioning blocks 12 located between the two auxiliary support blocks 13, so as to support and position the two ends of the stainless steel pipe through the two auxiliary support blocks 13.

[0266] The upper surfaces of the equal-height positioning block 12 and the auxiliary bearing block 13 are flush, and the upper surfaces of the equal-height positioning block 12 and the auxiliary bearing block 13 are provided with V-shaped grooves. The stainless steel tube is placed in the V-shaped grooves to limit the movement of the stainless steel tube.

[0267] Furthermore, a clamping plate 14 is provided on the leveling positioning block 12. The clamping plate 14 covers the V-groove and is engaged with the leveling positioning block 12 to limit the movement of the stainless steel tube and further improve its stability. For example, the angle of the V-groove is 90° and the depth is 10mm.

[0268] Before placing the stainless steel tube on the leveling block 12, the tool electrode 10 needs to be aligned first. Then, the stainless steel tube is inserted into the discharge end 101 of the tool electrode 10. Finally, the leveling block 12, the auxiliary support block 13 and the clamping plate 14 are used to clamp the stainless steel tube, and the leveling block 12 and the auxiliary support block 13 are used to align the stainless steel tube.

[0269] One end of the transmission rod 15 is connected to the tool electrode 10 and is parallel to the center line of the discharge end 101 of the tool electrode 10. During the processing, the other end of the transmission rod 15 is mounted on the machine tool so that the machine tool drives the transmission rod 15 to swing, thereby driving the tool electrode 10 to move, so as to realize that the discharge end 101 of the tool electrode 10 makes an eccentric movement around the central axis of the inner cavity of the stainless steel tube.

[0270] In this way, the discharge end 101 of the tool electrode 10 moves eccentrically around the central axis of the inner cavity of the stainless steel tube for one revolution, thus completing the processing of the annular groove of the stainless steel tube, achieving one-time processing and significantly improving processing efficiency.

[0271] Example 6

[0272] Because the main body 1-2 of the air passage has a weak point 7, it is very easy for the weak point to break during subsequent handling and processing. Based on the above considerations, this embodiment provides a protective fixture 8 to protect the weak point in embodiment two.

[0273] like Figure 6 As shown, the protective fixture includes a protective body 8-1 and a clamping member 8-2. The protective body 8-1 is used to accommodate the weak part 7 on the gas passage body 1-2, and the clamping member 8-2 is used to fix the gas passage body 1-2 inside the protective body 8-1 to fix the weak part 7. The clamping member 8-2 is sleeved on the protective body 8-1.

[0274] Specifically, one end of the protective body 8-1 is closed, and a through groove 8-4 is provided on it along the radial direction of the protective body 8-1. One end of the air passage body 1-2 passes through the through groove 8-4 until the weak part 7 is located in the through groove 8-4.

[0275] Considering the relatively long length of the gas passage body 1-2, it would be inconvenient to place the weak part within the through groove if one end of the gas passage body 1-2 were to pass through it. Therefore, in a preferred embodiment, the through groove 8-4 extends from one end of the protective body 8-1 to the other end, making the other end of the protective body 8-1 an open end. Since the through groove 8-4 extends from one end of the protective body 8-1 to the other end, during use, it is not necessary to pass one end of the gas passage body 1-2 through the through groove; the weak part 7 can be placed within the through groove 8-4 simply by entering it through the opening at the other end of the protective body 8-1, greatly improving the ease of operation.

[0276] In one possible implementation, the clamping member 8-2 has a through hole through which the protective body passes. The clamping member 8-2 and the protective body 8-1 are threaded together. Exemplarily, the outer surface of the protective body has external threads, and the through hole of the clamping member has internal threads.

[0277] Preferably, the protective fixture further includes an anti-loosening component 8-3. The anti-loosening component 8-3 is located on the outside of the clamping component 8-2, near the opening end of the protective body 8-1, and is used to prevent the clamping component 8-2 from loosening, thereby preventing the weak part from moving out of the through groove 8-4 of the protective body 8-1. The structure of the anti-loosening component 8-3 can be the same as that of the clamping component, or it can adopt other structures, as long as it can effectively prevent the clamping component from loosening.

[0278] To reduce the difficulty of processing, the protective body 8-1 in this embodiment can be made of bolts. A through groove is machined on the screw along the length direction to form a radially through axial groove. Nuts can be used for both the anti-loosening part and the clamping part.

[0279] Those skilled in the art will understand that all or part of the processes of the methods described in the above embodiments can be implemented by a computer program instructing related hardware, and the program can be stored in a computer-readable storage medium. The computer-readable storage medium may be a disk, optical disk, read-only memory, or random access memory, etc.

[0280] This invention provides a novel pipeline structure that satisfies both ventilation and electrical signal transmission functions by analyzing confined spaces and corresponding functional requirements. The use of various small-diameter stainless steel pipes to form the pipeline body and sleeve assembly meets the minimum space and positioning requirements. The selected thermocouple wire structure meets the insulation requirements. The invention features a novel and reasonable arrangement of pipeline welding, sleeve, and bending steps, as well as insulation testing for each step. While effectively forming the pipeline shape, the insulation performance of the components is simultaneously ensured, thus achieving the dual functions of ventilation and electrical signal transmission.

[0281] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A processing method of an air-electric dual function connecting seat, characterized in that, The method comprises the following steps: Step 1: machining a connecting body of the connecting seat and a protrusion at one end of the connecting body; Step 2: machining a through hole on the connecting body; Step 3: machining a second groove on both sides of the connecting body, an opening slot on the protrusion and a first groove on the connecting body; The protrusion is used for limiting and is arranged circumferentially along the outer surface of the connecting body; the connecting body is used for air passage and placing a thermocouple; the protrusion is provided with a radial opening slot for passing the thermocouple and installing a gas-electric dual-function pipeline; the first groove is arranged on the end surface of the connecting body, and the second groove is arranged on the side surface of the connecting body; the first groove and the second groove are communicated; The thermocouple is fixed on the connecting body by the following method: Spraying an insulating coating on the end surface of the connecting body provided with the first groove; Placing a node of the thermocouple at the communication position of the first groove and the through hole on the connecting body and suspending the thermocouple, and sleeving an insulating part on the thermocouple; Adhesively fixing the thermocouple in the first groove and the second groove; Measuring the insulation of the thermocouple and other metal parts of the pipeline.

2. The method of claim 1, wherein the method further comprises: The step 2 comprises machining the through hole on the connecting body with the other end of the connecting body as a reference.

3. The method of claim 1, wherein the method further comprises: The step 1 further comprises machining external threads on the connecting body.

4. The method of claim 2, wherein the method further comprises: The step 3 and the step 2 are machined by using the same reference.

5. The method of claim 4, wherein the method further comprises: The step 3 comprises the following steps: Step 31: simultaneously machining the second groove on both sides of the connecting body and two first opening slots on the protrusion; Step 32: machining two second opening slots on the protrusion; Step 33: machining the first groove on the connecting body.

6. The machining method of the gas-electric dual-function connecting seat according to claim 5, in the step 32, the second opening slots are uniformly distributed circumferentially.

7. The method of claim 1, wherein the method further comprises: The step 3 is machined by electric spark machining.

8. The method of claim 1, wherein the method further comprises: The first groove is arranged on the end surface of the connecting body, and the second groove is arranged on the side surface of the connecting body; the first groove and the second groove are communicated.

9. The method of claim 1, wherein the method further comprises: The connecting body is provided with an axial through hole for passing gas.

10. An electro-gas dual function pipe, characterized by, The connecting seat, the gas pipeline body, the sleeve assembly, the thermocouple, the pipe nozzle and the electric connector obtained by the machining method of any one of claims 1-8 are included; One end of the gas pipeline body is connected with the connecting seat, and the other end is connected with the pipe nozzle, for realizing air passage of the pipeline; the thermocouple is fixed on the gas pipeline body, and a free end thereof is connected with the electric connector, for realizing electric signal passage of the pipeline; The sleeve assembly is sleeved outside the gas pipeline body and the thermocouple, for protecting the gas pipeline body and the thermocouple.

Images