A pipeline with pneumatic and electric dual functions

Abstract

The present application relates to a kind of pipeline with pneoelectric dual function, belong to composite precision forming technical field, solve the single function of existing pipeline, air pipeline and the pipeline of electric signal are set apart, cannot satisfy the use demand in narrow cabin problem.The pipeline with pneoelectric dual function, including air path component, sleeve pipe component, thermocouple, connector nozzle and electric connector;The air path component is connected with the connector nozzle, for realizing the aeration of pipeline;The thermocouple is fixed on the air path component, and its free end is connected with the electric connector, for realizing the electric signal of pipeline;The sleeve pipe component is set on the outside of air path component and the thermocouple, for protecting air path component and the thermocouple.The present application realizes the diversification of pipeline function, a pipeline has both aeration function, and has electric function.

Description

Technical Field

[0001] This invention relates to the field of precision forming technology, and in particular to a pipeline with both pneumatic and electrical functions. Background Technology

[0002] With the development of aerospace technology, miniaturization and structural weight reduction have become increasingly important, which in turn makes cabin space increasingly smaller. Therefore, it is necessary to manufacture pipelines that can output electrical signals and have ventilation capabilities in a small space.

[0003] The existing piping system has a single function, with separate ventilation and electrical signal lines, which cannot meet the usage requirements of a confined space. Summary of the Invention

[0004] Based on the above analysis, the present invention aims to provide a pipeline with dual pneumatic and electrical functions to solve the problem that existing pipelines have only one function, and the ventilation pipeline and the electrical signal pipeline are set up separately, which cannot meet the usage requirements in a small cabin.

[0005] The objective of this invention is mainly achieved through the following technical solutions:

[0006] On one hand, the present invention provides a pipeline with dual pneumatic and electrical functions, including a pneumatic assembly, a sleeve assembly, a thermocouple, a connector, and an electrical connector; the pneumatic assembly is connected to the connector to enable airflow in the pipeline; the thermocouple is fixed to the pneumatic assembly, and its free end is connected to the electrical connector to enable an electrical signal for the pipeline; the sleeve assembly is sleeved on the outside of the pneumatic assembly and the thermocouple to protect the pneumatic assembly and the thermocouple.

[0007] Optionally, the gas path assembly includes a connector and a gas path body; the connector includes a connector body, the connector body has an axial through hole, one end of the connector body is connected to the gas path body, and the other end has a first groove for placing the thermocouple, the first groove communicating with the through hole.

[0008] Optionally, a second groove is provided on the side of the connecting body. The second groove is parallel to the axial direction of the connecting body and extends from one end of the connecting body to the other end. The second groove communicates with the first groove.

[0009] Optionally, the connector further includes a protrusion located at one end of the connector body that connects to the gas passage body, and the protrusion is circumferentially arranged along the outer surface of the connector body.

[0010] Optionally, the cannula assembly includes a first cannula assembly and a second cannula assembly; the second cannula assembly is located downstream of the first cannula assembly.

[0011] Optionally, a weak section is provided between the first sleeve assembly and the second sleeve assembly to facilitate the breakage and detachment of the pipeline after it has completed its corresponding function.

[0012] Optionally, the weak part is an annular groove provided circumferentially along the outer surface of the gas passage body.

[0013] Optionally, the depth of the annular groove is 0.3 mm.

[0014] Optionally, the main body of the gas path is a stainless steel pipe with a diameter of 2 mm and a wall thickness of 0.5 mm.

[0015] On the other hand, the present invention also provides a method for forming a pipeline with both pneumatic and electrical functions, comprising the following steps:

[0016] Step 1: Connect one end of the gas circuit main body to the connecting body;

[0017] Step 2: Place the thermocouple in the groove of the connecting body;

[0018] Step 3: Fit the sleeve assembly over the outside of the gas circuit body and the thermocouple;

[0019] Step 4: Bend the sleeve assembly into shape;

[0020] Step 5: Connect the other end of the gas circuit body to the connecting nozzle, and connect the free end of the thermocouple to the electrical connector to obtain a pipeline with both gas and electrical functions.

[0021] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0022] (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.

[0023] (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.

[0024] (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.

[0025] (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.

[0026] (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.

[0027] (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.

[0028] (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.

[0029] (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.

[0030] (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.

[0031] (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.

[0032] (11) By setting weak points, the present invention facilitates the breakage and detachment of the pipeline after it has completed its corresponding function.

[0033] (12) By setting up protective tooling, the present invention can effectively prevent breakage at weak points during subsequent turnover and processing.

[0034] 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

[0035] 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.

[0036] Figure 1 This is a schematic diagram of the pipeline structure of the present invention, which has dual functions of ventilation and power supply;

[0037] Figure 2 This is a schematic diagram of the gas path assembly structure;

[0038] Figure 3 This is a schematic diagram of the first set of pipe assembly structure;

[0039] Figure 4 This is a schematic diagram of the second sleeve assembly structure;

[0040] Figure 5 A schematic diagram of a structure with a weak point (annular groove) on the main body of the gas passage;

[0041] Figure 6 To protect the schematic diagram of the tooling structure;

[0042] Figure 7 This is a schematic diagram of the flow guide structure;

[0043] Figure 8 This is a schematic diagram of the tool electrode structure of the present invention;

[0044] Figure 9 for Figure 8 Schematic diagram of the cross-section at point AA;

[0045] Figure 10 for Figure 8 Schematic diagram of the cross-section at point BB;

[0046] 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 gas path body;

[0047] Figure 12 This 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 gas passage body;

[0048] 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 the gas path body.

[0049] Figure 14This is a schematic diagram of the motion 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 gas path body in this invention.

[0050] 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 gas path body.

[0051] Figure 16 This is a schematic diagram of the structure of the bearing component and the air passage body of the present invention.

[0052] Figure 17 This is a schematic diagram of the annular groove structure of the main gas passage in this invention;

[0053] Figure 18 This is a schematic diagram of the structure of the equal-height positioning block, clamping plate and air passage body in this invention;

[0054] Figure 19 This is a schematic diagram of the structure in which the auxiliary support block and the main air passage body cooperate in this invention.

[0055] Figure label:

[0056] 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;

[0057] H1, wall thickness of the main gas passage; H2, wall thickness of the annular groove; α, oblique angle; S 11 S 12 S 13 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 air path body; S2. Machining clearance; O1. Center point of the discharge end; O2. Center point of the inner cavity of the air path body; O3. Points selected on the discharge end. Detailed Implementation

[0058] 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.

[0059] Example 1

[0060] A specific embodiment of the present invention discloses a pipeline with dual functions of ventilation and power supply, such as... Figure 1 As 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.

[0061] like Figure 2 As shown, the gas path assembly 1 includes a connecting seat and a gas path body 1-2. 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] Specifically, the second sleeve body 3-1 is a stainless steel pipe with a diameter of 4mm and a wall thickness of 0.3mm.

[0076] The second limiting sleeve 3-2 is a stainless steel tube with a diameter of 5mm and a wall thickness of 0.5mm.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] Example 2

[0086] Another specific embodiment of the present invention discloses a method for processing a connector for a gas-electric dual-function pipeline, used for processing the connector of Embodiment 1, comprising the following steps:

[0087] 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.

[0088] Step 2: Machining through holes on the connecting body.

[0089] 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.

[0090] 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:

[0091] 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.

[0092] 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.

[0093] Example 3

[0094] 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 1.

[0095] 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.

[0096] The processing of the connector is described in Example 2. The forming of the first sleeve assembly 2 and the second sleeve assembly 3 are described below.

[0097] The first sleeve assembly 2 is formed by the following method:

[0098] 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;

[0099] Step 2: Cut multiple first limit sleeves 2-2, saw them to cut them, and remove burrs from the flat end;

[0100] Step 3: Machining and forming connecting sleeves 2-3;

[0101] 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.

[0102] 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.

[0103] The second sleeve assembly 3 is formed by the following method:

[0104] 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;

[0105] Step 2: Cut the second limiting sleeve 3-2 by wire cutting and remove burrs from the flat end;

[0106] 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.

[0107] The assembly method for a dual-function pneumatic and electrical pipeline includes the following steps:

[0108] Step 1: Connect the main body of the gas circuit to the connector to obtain the gas circuit assembly.

[0109] Step 2: Place the insulating part over the thermocouple and secure the thermocouple to the connector. Details are as follows:

[0110] 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;

[0111] Step 22: Place multiple insulating units onto the thermocouple in sequence to achieve the purpose of placing the insulating part onto the thermocouple;

[0112] Step 23: Fix the thermocouple into the second groove on the connecting body.

[0113] Step 3: Fit the sleeve assembly over the outside of the gas circuit body and the thermocouple, as follows:

[0114] Step 31: Fit the first sleeve assembly onto the outside of the gas circuit body and the thermocouple;

[0115] Step 32: Insert the second sleeve assembly into the outside of the gas circuit body and the thermocouple, downstream of the first sleeve assembly.

[0116] 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.

[0117] Step 4: Connect the main body of the gas circuit to the connecting nozzle.

[0118] Step 5: Connect the free end of the thermocouple to the electrical connector to obtain a gas-electric dual-function pipeline.

[0119] The method for forming the gas-electric dual-function pipeline in this embodiment includes the following steps:

[0120] 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.

[0121] 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.

[0122] Step 3: Fix the thermocouple.

[0123] 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.

[0124] 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:

[0125] 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.

[0126] Step 5: Insert the second sleeve assembly 3 onto the outside of the gas circuit body 1-2 and the thermocouple 4, downstream of the first sleeve assembly 2. The precautions for insertion are the same as for inserting the first sleeve assembly 2. After insertion, measure the resistance to ensure insulation between the thermocouple 4 and the rest of the metal parts of the pipeline. After confirming insulation, weld the second sleeve assembly 3 to the connecting body 1-1. After welding, measure the resistance again to confirm insulation. If insulation is not achieved, investigate the cause until insulation is achieved.

[0127] 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.

[0128] Step 7: Conduct an airtightness test on the pipeline with both pneumatic and electrical functions.

[0129] 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.

[0130] 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.

[0131] Example 4

[0132] 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 1.

[0133] 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.

[0134] 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 an annular groove on the surface to be machined.

[0135] 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.

[0136] 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.

[0137] The threshold is the discharge distance between the EDM point that meets the processing requirements and the surface to be processed.

[0138] 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.

[0139] 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.

[0140] In one possible implementation, the discharge end 101 is a rigid structure, and is sleeved on the outer end face of the gas path body 1-2. During processing, the gas path body is electrically connected to the other output end of the power supply device, and the tool electrode 10 moves eccentrically around the central axis of the inner cavity of the gas path body. 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 gas path body continuously changes. When the distance between the electrical discharge machining point and the surface to be processed is greater than a threshold, the electrical discharge machining point is in a non-working state, and at this time, the electrical discharge machining point is a non-working end 103. When the distance between the electrical discharge machining point and the surface to be processed is less than or equal to a threshold, the distance between the discharge end 101 and the surface to be processed is equal to a threshold. When the threshold is reached, the electrical discharge machining point is in the working state. At this time, the electrical discharge machining point is the working end 102. In this way, the transition between the working state and the non-working state can be realized at the same electrical discharge machining point. The working states of all electrical discharge machining points can jointly realize the machining of the annular groove on the surface to be machined. 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 gas path body. All working ends form a continuous annular discharge end around the circumference of 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.

[0141] 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 gas path body 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.

[0142] 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 the annular groove of the gas path body. 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 gas path body, and the plane containing this circumferential direction is perpendicular to the central axis of the inner cavity of the gas path body.

[0143] 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 gas path body 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.

[0144] 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 gas path body. The machining direction 16 is a circumferential direction around the outer end face of the gas path body, and the center line of this circumferential direction coincides with the central axis of the inner cavity of the gas path body.

[0145] 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 gas path body, and there should be a margin gap between the discharge end 101 and the outer end face of the gas path body, that is, the diameter of the inner circle of the discharge end 101 is larger than the outer diameter of the gas path body. For example, the diameter of the inner circle is 10 to 20 mm, which is 5 to 10 times the outer diameter of the gas path body. In this way, it is easy to determine the value of the single-sided feed rate O1O2 during the electrical discharge machining process.

[0146] Among them, the unilateral feed rate O1O2 satisfies:

[0147] O1O2=S1+(H1-H2)-S2

[0148] Wherein, O1 represents the center point of the discharge terminal 101 of the tool electrode 10;

[0149] O2 represents the center point of the main cavity of the gas passage;

[0150] H1 is the wall thickness of the main gas passage;

[0151] H2 is the wall thickness of the annular groove;

[0152] S1 indicates that there is a margin gap between the discharge end 101 and the outer end face of the gas path body;

[0153] S2 is the machining clearance, which refers to the closest distance between the working end 102 and the end face of the air passage body 01 when the tool electrode 10 moves eccentrically.

[0154] Wherein, S1 satisfies:

[0155]

[0156] 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 gas path body is given. These four points are evenly distributed on the discharge end 101.

[0157] For example, 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.

[0158] The machining gap S2 is set to 10-50 μm to meet the requirements of electrical discharge machining.

[0159] For example, S2 = 10 μm; H1 = 0.5 mm, H2 = 0.3 mm, S1 = 2.058 mm, and O1O2 = 2.248 mm.

[0160] 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 gas path body.

[0161] Among them, after the center of the discharge end 101 of the machine tool adjusting tool electrode 10 is aligned with the central axis of the inner cavity of the gas path body, the actual measured S 11 S 12 S 13 S 14The 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.

[0162] 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 gas path body, the machine tool drives the tool electrode 10 to make an eccentric movement. The detailed process is as follows.

[0163] 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 gas path body are described below:

[0164] 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.

[0165] 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;

[0166] During the movement of O1, when the closest distance between the end face of the discharge end 101 and the surface of the gas path body reaches 10μm, the power supply device is turned on to deliver a pulse voltage to the tool electrode 10 and the gas path body, and the metal on the surface of the gas path body is etched 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.

[0167] 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:

[0168] The movable tool electrode 10 causes O3 to move toward O2, with a moving distance of O1O2;

[0169] 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;

[0170] During the movement of O3, when the closest distance between the end face of the discharge end 101 and the surface of the gas path body reaches 10μm, the power supply device is turned on to deliver a pulse voltage to the tool electrode 10 and the gas path body, and the metal on the surface of the gas path body 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.

[0171] 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 gas path body 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 gas path body 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.

[0172] The discharge end 101 has a clearance between its outer end face and the gas path body 01 to ensure that the non-working end 103 at the discharge end 101 has a sufficiently large non-machining clearance with the end face of the gas path body. This ensures that the pulse voltage released at the non-working end 103 cannot erode the metal on the surface of the gas path body. Thus, when the tool electrode 10 moves eccentrically, the working end 102 and the non-working end 103 can be dynamically switched.

[0173] 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 air circuit body 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.

[0174] During processing, the gas path body 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 gas path body, the liquid medium at the closest point between the gas path body and the discharge end 101 under the current 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 gas path body, resulting in a small pit. After the first pulse discharge ends, after a very short interval, the second pulse makes a breakthrough discharge at the closest point between the other electrodes. This cycle repeats at a high frequency, and the tool electrode 10 continuously feeds into the gas path body. Its shape is eventually replicated on the gas path body to form the required machining surface. During the machining process, although a small portion of the total energy is also 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 by the eccentric movement of the discharge end 101 around the central axis of the inner cavity of the gas path body. This reduces the wear on the tool electrode 10 by avoiding continuous machining of the working end 102. As a result, at each moment of machining, the working end 102 of the discharge end 101 maintains a relatively complete shape, improving machining accuracy.

[0175] For example, during the processing, the electrical parameters satisfy:

[0176] Pulse width 30–60 μs, pulse interval 20–30 μs, average machining current 0.8–2 A, average machining voltage 30–60 V.

[0177] Specifically, during processing, the machine tool controls the eccentric movement of the tool electrode 10, while the main body of the air passage remains stationary.

[0178] 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.

[0179] 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 gas path body.

[0180] For example, during the processing, the non-electrical parameters satisfy:

[0181] 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.

[0182] Specifically, such as Figure 16 As shown, the main body of the gas circuit is placed on the equal-height positioning block 12 and the auxiliary support block 13 to clamp the main body of the gas circuit.

[0183] Two equal-height positioning blocks 12 are used to clamp the two sides of the area to be processed on the main body of the air passage to ensure the stability of the area to be processed during the processing. For example, the distance between the two equal-height positioning blocks 12 is 30mm.

[0184] Two equal-height positioning blocks 12 are placed between two auxiliary support blocks 13. The two auxiliary support blocks 13 are used to support and position both ends of the gas circuit body, further ensuring the stability of the gas circuit body during the processing.

[0185] Among them, such as Figure 18-19 As shown, the upper surfaces of the equal-height positioning block 12 and the auxiliary support block 13 are flush, and the upper surfaces of the equal-height positioning block 12 and the auxiliary support block 13 are provided with V-shaped grooves. The main body of the air passage is placed in the V-shaped grooves to limit the position of the main body of the air passage.

[0186] Furthermore, the clamping plate 14 is placed over the V-groove and engaged with the level positioning block 12 to limit the movement of the air passage body, thereby further improving its stability. For example, the V-groove has an angle of 60°-90° and a depth of 5-10mm.

[0187] Before placing the gas path body on the leveling block 12, the tool electrode 10 needs to be aligned using a machine tool. Then, the gas path body is inserted into the discharge end 101 of the tool electrode 10. Finally, the gas path body is clamped using the leveling block 12, the auxiliary support block 13, and the clamping plate 14, and the gas path body is aligned using the leveling block 12 and the auxiliary support block 13.

[0188] 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 air passage body, ensuring that the central axis of the inner cavity of the air passage body 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.

[0189] The alignment process for the main gas path is as follows.

[0190] 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.

[0191] Before placing the gas path body on the leveling block 12, the gas path body is first inserted into the discharge end 101 of the tool electrode 10, and then the gas path body 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 gas path body.

[0192] 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 gas path body.

[0193] In this way, the discharge end 101 of the tool electrode 10 can complete the machining of the annular groove of the gas passage body by eccentrically moving around the central axis of the inner cavity of the gas passage body, thus achieving machining in one go and significantly improving machining efficiency.

[0194] 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.

[0195] Multiple electrical discharge machining 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 air passage body. 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 changes to the non-working end 103. This realizes the 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 thus reducing the deformation of the working end face of the tool electrode 10, thereby improving the machining accuracy of the annular groove of the air passage body.

[0196] The discharge end 101 of the tool electrode 10 of the present invention is fitted onto the ultra-thin and long air passage body and moves eccentrically. During processing, the distance between the discharge end 101 and the ultra-thin and long air passage body changes from large to small and then from small to large. During the process of the distance changing from large to small, metal debris is generated between the discharge end 101 and the air passage body. At this time, some of the metal debris will be discharged with the working fluid through the processing gap. During the process of the distance changing from small to large, the distance between the discharge end 101 and the air passage body 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 the tool electrode 10 directly connecting to the air passage body through metal debris.

[0197] By having the discharge end 101 of the tool electrode 10 move eccentrically on the ultra-slender gas path body, 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.

[0198] like Figure 17As 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.

[0199] 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 and long air passage body by moving eccentrically around the central axis of the inner cavity of the ultra-thin and long air passage body once, thus achieving one-time processing and significantly improving processing efficiency.

[0200] By eccentrically moving the discharge end 101 of the tool electrode 10 around the central axis of the inner cavity of the gas path body, 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.

[0201] 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-slender air passage body 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.

[0202] This embodiment abandons the traditional turning process for ultra-thin stainless steel tubes. Instead, 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. In other words, 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.

[0203] In this embodiment, the discharge end 101 of the tool electrode 10 is eccentrically moved 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 be moved, 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.

[0204] 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.

[0205] The specific steps are as follows:

[0206] 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;

[0207] 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.

[0208] Step 2: Use the bearing assembly to clamp the air passage body 1-2 and align the air passage body 1-2;

[0209] 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.

[0210] Then place the air circuit body on the level positioning block 12. Before placing it, pass the air circuit body through the inner circle of the lower end of the tool electrode 10. Use the level positioning block 12 to ensure that the air circuit body is in a horizontal position. The distance between the two level positioning blocks 12 is 30mm.

[0211] Next, place both ends of the main gas path on the auxiliary support block 13, and finally fix it with the clamping plate 14.

[0212] 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 gas path body;

[0213] Specifically, the position of the air passage body is first adjusted by moving the bearing component upward along the X-axis of the machine tool so that the position to be processed of the stainless steel 6 is located within the discharge end 101 of the tool electrode 10.

[0214] 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 gas path body. If they are not aligned, the position of the bearing component is adjusted by the machine tool until the requirements are met.

[0215] Step 4: Using kerosene and water as working fluids, perform electrical discharge machining on the gas circuit body using tool electrode 10 in the working fluids.

[0216] Specifically, step 4 includes the following steps:

[0217] 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 gas path body;

[0218] 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 gas path body through the transmission rod 15. The direction of eccentric motion 17 is shown in the figure. Figure 14 .

[0219] The swing speed of the transmission rod 15 is 0.5 rpm;

[0220] S 11 S 12 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.

[0221] The machining clearance S2 is 10 μm;

[0222] Single-sided feed rate O1O2=S1+(H1-H2)-S2=2.058+(0.5-0.3)-0.01=2.248mm;

[0223] The processing speed is 0.04 g / min.

[0224] Step 42: When the tool electrode 10 is in eccentric motion, energize the tool electrode 10 to perform electrical discharge machining.

[0225] Specifically, the electrical parameters satisfy:

[0226] Pulse width 40μs, pulse interval 26μs, average machining current 1A, average machining voltage 40V.

[0227] The above processing method was used to process the annular groove of the ultra-slender air passage body of parts #01-#10. The processing parameters are shown in Table 1 below.

[0228] Table 1 Processing Parameters

[0229]

[0230]

[0231] Processing requirements: The wall thickness of the annular groove is 0.3±0.05mm, and the bevel angle α is 90°. The test results are shown in Table 2 below.

[0232] Table 2 Detection Results

[0233]

[0234]

[0235] 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.

[0236] As shown in Table 2, the average groove depth of the annular grooves of the 10 gas path bodies processed in this embodiment is 0.2146 mm, the standard deviation is 0.01427, and the coefficient of variation is 0.07. The annular groove angle is 90°. The average wall thickness of the annular groove is 0.299 mm, the standard deviation is 0.006681, and the coefficient of variation is 0.02. It can be seen that the processing method of the present invention can realize the processing of annular grooves of ultra-thin and long gas path bodies. The processed annular grooves have high precision and stability, will not damage the ultra-thin and long gas path bodies, and have less wear on the tool electrode.

[0237] A diameter-to-length ratio of 1:100–150 generally qualifies as an ultra-slender shaft. For example, the outer diameter of the main air passage component used in a certain aircraft product is 2mm, the inner diameter is 1mm, and the length is 1–1.2m. The outer diameter-to-length ratio of this main air passage component is 1:500–600, classifying it as an ultra-slender air passage component. Generally, an annular groove needs to be machined into this ultra-slender steel tube. This annular groove is a recessed groove used to separate the aircraft product's guidance system from the fairing body when the product reaches a predetermined altitude and position.

[0238] Because the ultra-thin air passage body has a small diameter and thin wall thickness, and the wall thickness at the annular groove position is even thinner, such as 0.3±0.05mm, its important dimensions cannot be obtained by 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 longer the length, the greater the centrifugal force caused by the workpiece rotation during the rotation process, the worse the coaxiality of the workpiece will be, and the cutting force generated can easily cause deformation of the ultra-thin stainless steel tube.

[0239] 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.

[0240] 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.

[0241] 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 air passage body, 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 air passage body, thereby realizing electrical discharge machining of the annular groove of the air passage body and solving the problem that it is difficult to machine annular grooves on ultra-slender air passage bodies.

[0242] 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 air circuit body. During machining, the air circuit body 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 air circuit body. During the eccentric movement of the tool electrode 10, the distance between the end face of the discharge end 101 and the end face to be machined of the air circuit body 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 machining trajectories of all working ends 102 together form an annular groove of an ultra-slender stainless steel tube.

[0243] 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 gas path body, and there is a margin gap between the discharge end 101 and the outer end face of the gas path body. The diameter of the end face of the discharge end 101 is 20mm, which is 10 times the outer diameter of the gas path body, 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 component. 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 gas path body.

[0244] 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.

[0245] Where S2 = 10 μm; H1 = 0.5 mm, H2 = 0.3 mm, S1 = 2.058 mm, and O1O2 = 2.248 mm.

[0246] 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 gas path body, the tool electrode 10 is in an eccentric motion state under the action of the drive component.

[0247] 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 air circuit body 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.

[0248] During the processing, the electrical parameters must meet the following requirements:

[0249] Pulse width 40μs, pulse interval 26μs, average machining current 1A, average machining voltage 40V.

[0250] 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 air passage body. During machining, the air passage body remains stationary.

[0251] During the processing, the non-electrical parameters satisfy the following:

[0252] 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.

[0253] Specifically, the support assembly includes a height positioning block 12 and an auxiliary support block 13 mounted on the machine tool to place the air passage body on the height positioning block 12 and the auxiliary support block 13 to clamp the air passage body.

[0254] The system includes two equal-height positioning blocks 12, which are located on both sides of the part of the gas path body to be processed, and the distance between the two equal-height positioning blocks 12 is 30mm.

[0255] 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 gas path body through the two auxiliary support blocks 13.

[0256] The upper surfaces of the equal-height positioning block 12 and the auxiliary support block 13 are flush, and the upper surfaces of the equal-height positioning block 12 and the auxiliary support block 13 are provided with V-shaped grooves. The main body of the air passage is placed in the V-shaped grooves to limit the position of the main body of the air passage.

[0257] Furthermore, a clamping plate 14 is provided on the leveling positioning block 12. The clamping plate 14 covers the V-shaped groove and is engaged with the leveling positioning block 12 to limit the position of the air passage body and further improve the stability of the air passage body. For example, the angle of the V-shaped groove is 90° and the depth is 10mm.

[0258] Before placing the gas path body on the leveling block 12, the tool electrode 10 needs to be aligned first. Then, the gas path body 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 gas path body, and the leveling block 12 and the auxiliary support block 13 are used to align the gas path body.

[0259] 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 gas path body.

[0260] In this way, the discharge end 101 of the tool electrode 10 can complete the machining of the annular groove of the gas passage body by eccentrically moving around the central axis of the inner cavity of the gas passage body, thus achieving machining in one go and significantly improving machining efficiency.

[0261] Example 5

[0262] 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 1.

[0263] 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.

[0264] 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.

[0265] 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 8-4 if one end of the gas passage body 1-2 were to pass through the through groove. Therefore, in a preferred embodiment, the through groove 8-4 extends from one end of the protective body 8-1 to the other end of the protective body 8-1, 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 only needs to enter from the opening at the other end of the protective body 8-1 to ensure that the weak part 7 is located within the through groove 8-4, greatly improving the ease of operation.

[0266] 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.

[0267] 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.

[0268] 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.

[0269] 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.

[0270] 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 air passage components to form the pipeline body and sleeve assembly meets the minimum space and positioning requirements. The selected thermocouple wire structure satisfies insulation requirements. The invention features novel and reasonable design of pipeline welding, sleeve, and bending steps, along with insulation testing for each step. This effectively shapes the pipeline while simultaneously ensuring the insulation performance of the components, thus achieving both ventilation and electrical signal transmission functions.

[0271] 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 pipe with air and electricity dual functions, characterized in that, The gas circuit assembly is connected with the pipe connector, and is used for realizing ventilation of the pipeline; the thermocouple is fixed on the gas circuit assembly, and a free end of the thermocouple is connected with the electric connector, and is used for realizing an electric signal of the pipeline; The sleeve assembly is sleeved outside the gas circuit assembly and the thermocouple, and is used for protecting the gas circuit assembly and the thermocouple; The connecting seat comprises a connecting body, an axial through hole is arranged on the connecting body, one end of the connecting body is connected with the gas body, and a first groove for placing the thermocouple is arranged on an end face of the other end of the connecting body, and the first groove is communicated with the through hole; A second groove is arranged on a side face of the connecting body, the second groove is parallel to the axial direction of the connecting body, and extends from one end of the connecting body to the other end, and the second groove is communicated with the first groove; The node of the thermocouple is arranged in a suspended mode at the communication position of the first groove and the through hole. The connecting seat further comprises a protrusion, the protrusion is arranged at one end of the connecting body connected with the gas body, and the protrusion is arranged in a circumferential direction along the outer surface of the connecting body. The sleeve assembly comprises a first sleeve assembly and a second sleeve assembly; the second sleeve assembly is arranged downstream of the first sleeve assembly.

2. The gas-electric dual function pipe according to claim 1, wherein A weak part is arranged between the first sleeve assembly and the second sleeve assembly, so as to facilitate the breakage and falling off of the pipeline after the corresponding function is completed.

3. The gas-electric dual function pipe according to claim 1, wherein The weak part is an annular groove arranged in a circumferential direction along the outer surface of the gas body.

4. The gas-electric dual function pipe according to claim 3, wherein The depth of the annular groove is 0.3 mm.

5. The gas-electric dual function pipe according to claim 4, wherein The gas body is a stainless steel pipe, the diameter is 2 mm, and the wall thickness is 0.5 mm.

6. The gas-electric dual function pipe according to claim 5, wherein A method for forming the pipeline with gas and electric dual functions according to any one of claims 1-7 comprises the following steps:

7. The gas-electric dual function pipe according to claim 1, wherein Step 1: connecting one end of the gas body with the connecting body; 8. A method of forming a pipe having a dual function of gas and electricity, characterized by, Step 2: placing the thermocouple in the groove of the connecting body; Step 3: sleeving the sleeve assembly outside the gas body and the thermocouple; Step 4: bending and forming the sleeve assembly; Step 5: connecting the other end of the gas body with the pipe connector, and connecting the free end of the thermocouple with the electric connector, to obtain the pipeline with gas and electric dual functions. ​ ​

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