Forming method for a multi-functional pipeline and multi-functional pipeline

Abstract

The present invention relates to a forming method for a multi-functional pipeline and a multi-functional pipeline, belonging to the field of composite precision forming technology, and solves the problem that the existing pipelines have a single function, the ventilation pipelines and the pipelines for conducting electrical signals are separately arranged, and the use requirements in a narrow cabin cannot be met. The forming method for the multi-functional pipeline comprises the following steps: inserting one end of an air path main body into a welding slot of a connection main body, welding, welding the other end to a nozzle, and performing an airtight test on the air path assembly; fixing a thermocouple; sleeving a first sleeve assembly outside the air path main body and the thermocouple; welding the first sleeve assembly and the connection main body; welding a second sleeve assembly and the connection main body; bending and forming the first sleeve assembly and the second sleeve assembly, and fixing the first sleeve assembly and the second sleeve assembly to obtain a pipeline with both air and electricity functions; the present invention realizes the diversification of pipeline functions, and one pipeline has both ventilation function and power conduction function.

Description

Technical Field

[0001] The present invention relates to the field of precision forming technology, and particularly to a forming method for a multi-functional pipeline and a multi-functional pipeline. Background Art

[0002] With the development of aerospace technology, miniaturization and structural weight reduction have become increasingly important. Correspondingly, the cabin space has become increasingly narrow. Therefore, it is required to prepare pipelines with dual functions of being able to output electrical signals and having ventilation capabilities in a narrow space.

[0003] The existing pipelines have a single function, and the ventilation pipelines and the pipelines for transmitting electrical signals are separately arranged, which cannot meet the usage requirements in a narrow cabin. Summary of the Invention

[0004] In view of the above analysis, the present invention aims to provide a forming method for a multi-functional pipeline and a multi-functional pipeline, so as to solve the problem that the existing pipelines have a single function, the ventilation pipelines and the pipelines for transmitting electrical signals are separately arranged, and cannot meet the usage requirements in a narrow cabin.

[0005] The purpose of the present invention is mainly achieved through the following technical solutions:

[0006] On the one hand, the present invention provides a forming method for a multi-functional pipeline, including the following steps:

[0007] Step 1: Insert one end of an air path main body provided with an axial through hole into the welding slot of a connection main body, and weld to obtain an air path assembly;

[0008] Step 2: Weld the other end of the air path main body to a nozzle, and perform an airtightness test on the air path assembly to check the airtightness of the weld between the connection main body and the air path main body;

[0009] Step 3: Fix a thermocouple on the air path main body;

[0010] Step 4: Sleeve a first sleeve assembly outside the air path main body and the thermocouple; after sleeving, measure the resistance to ensure that the thermocouple is insulated from other metal parts; weld the first sleeve assembly and the connection main body; after welding, measure the resistance again to confirm whether it is insulated;

[0011] Step 5: Sleeve a second sleeve assembly outside the air path main body and the thermocouple, downstream of the first sleeve assembly; after sleeving, measure the resistance to ensure that the thermocouple is insulated from other metal parts; weld the second sleeve assembly and the air path main body; after welding, measure the resistance again to confirm whether it is insulated;

[0012] Step 6: Bend and form the first sleeve assembly and the second sleeve assembly, and fix the first sleeve assembly and the second sleeve assembly to obtain a pipeline with both air and electricity functions;

[0013] Step 7: Connect the free end of the thermocouple to the electrical connector, measure the resistance, ensure that the thermocouple is insulated from the rest of the metal parts of the pipeline, and obtain a gas-electric dual-functional pipeline.

[0014] Optionally, step 2 further includes performing a passability check on the weld after the weld between the main body to be connected and the gas path main body is airtight, so as to ensure that the through hole on the main body to be connected can pass gas after welding.

[0015] Optionally, step 3 includes the following steps:

[0016] Step 31: Spray an insulating coating on the end face of the connection main body provided with the first groove;

[0017] Step 32: Place the node of the thermocouple at the connection of the first groove and the through hole on the connection main body, and set it in suspension, and sleeved the insulating part on the thermocouple;

[0018] Step 33: Bond and fix the thermocouple in the first groove on the end face of the connection main body and the second groove provided on the side of the connection main body;

[0019] Step 34: Measure the insulation between the thermocouple and other metal parts.

[0020] Optionally, before step 1, it further includes forming the first sleeve assembly and the second sleeve assembly respectively.

[0021] Optionally, forming the first sleeve assembly includes the following steps:

[0022] Calculate the length of the first sleeve main body, saw and cut the material, and remove the burrs at the flat end;

[0023] Cut multiple first limiting sleeves, saw and cut the material, and remove the burrs at the flat end;

[0024] Machining to form the connecting sleeve;

[0025] Sequentially sleeved multiple first limiting sleeves on the first sleeve main body and weld them;

[0026] Sleeve the connecting sleeve on one end of the first sleeve main body and weld it.

[0027] Optionally, forming the second sleeve assembly includes the following steps:

[0028] Calculate the length of the second sleeve main body, saw and cut the material, and remove the burrs at the flat end;

[0029] Cut the second limiting sleeve, cut the material by wire cutting, and remove the burrs;

[0030] Sleeve the second limiting sleeve on the second sleeve main body and weld it.

[0031] Optionally, an airtight test is also included between step 6 and step 7 for the gas-electric dual-functional pipeline.

[0032] Optionally, the airtight test is carried out by means of drawing negative pressure.

[0033] Optionally, in step 1, when welding, a margin is left between the gas path main body and the connection main body.

[0034] On the other hand, the present invention also provides a gas-electric dual-functional pipeline, which is formed by using the above-mentioned forming method. The multi-functional pipeline includes a gas path assembly, a thermocouple, a first sleeve assembly and a second sleeve assembly; the gas path assembly is used to realize the ventilation of the pipeline; the thermocouple is fixed on the gas path assembly to realize the power-on signal of the pipeline.

[0035] Compared with the prior art, the present invention can at least achieve one of the following beneficial effects:

[0036] (1) In the forming method of the pipeline with dual functions of ventilation and power-on of the present invention, instead of bending and forming the first sleeve assembly and the second sleeve assembly first and then sleeving them on the gas path main body, the first sleeve assembly and the second sleeve assembly are bent and formed after being sleeved on the gas path main body, which reduces the damage to the insulating part outside the thermocouple during the process of sleeving the first sleeve assembly and the second sleeve assembly, can effectively ensure the insulation between the thermocouple and the rest of the metal parts of the pipeline, and improves the qualification rate of the pipeline with dual functions of ventilation and power-on of the present invention.

[0037] (2) In the forming method of the pipeline with dual functions of ventilation and power-on of the present invention, after each operation is completed, airtightness and / or insulation tests are carried out, which can timely detect problems and deal with them in time, improving the forming efficiency and forming qualification rate.

[0038] (3) Aiming at the problem that it is difficult to carry out a positive pressure airtight test because the thermocouple is bonded in the second groove, by using a vacuum bag to carry out a negative pressure test, it can not only ensure the completion of the airtight test, but also protect the thermocouple from damage.

[0039] (4) The present invention realizes the ventilation function of the pipeline by setting a first groove on the end face of the connection main body, setting a through hole along the axial direction of the connection main body, and suspending the node of the thermocouple at the communication part of the first groove and the through hole, so that the gas can enter the through hole and the gas path main body through the gap between the node and the connection main body. The power-on function of the pipeline is realized by setting the thermocouple, and thus the dual functions of ventilation and power-on are realized.

[0040] (5) The present invention reduces the risk of short - circuit caused by the contact between the thermocouple and other metals and decreases the overall volume of the pipeline by setting a first groove on the end face of the connection body, a second groove on the outer surface of the connection body, and connecting the first groove and the second groove, so that the thermocouple can be orderly placed in the first groove and the second groove.

[0041] (6) The present invention can prevent the connection body from conducting electricity with the thermocouple by spraying an insulating coating on the end face of the first groove.

[0042] (7) The present invention can make the connection between the connection body and the gas - path body more firm by setting a slot at the connection between the connection body and the gas - path body.

[0043] (8) By sleeving an insulating part outside the thermocouple, the present invention can insulate the thermocouple from other metals in the pipeline, thereby realizing the function of the thermocouple to transmit electrical signals and making the transmitted electrical signals clear and stable.

[0044] (9) By setting a limiting sleeve outside the sleeve body, the present invention can position and limit the sleeve body on the cabin body, thus saving the internal space of the cabin body. By reasonably setting the distance between multiple limiting sleeves, other lines or components can pass through the gaps between adjacent limiting sleeves, further saving the internal space of the cabin body.

[0045] (10) By setting a flow - guiding part, on the one hand, the present invention restricts the airflow from entering through the through - holes on the connection body 1 - 1, improving the ventilation effect; on the other hand, it can protect the thermocouple at the front end.

[0046] (11) By setting a weak part, the present invention facilitates the break - off of the pipeline after it has completed its corresponding functions.

[0047] (12) By setting a protection tooling, the present invention can effectively prevent the pipeline from breaking at the weak part during subsequent turnover and processing.

[0048] In the present invention, the above - mentioned technical solutions can also be combined with each other to achieve more preferred combination schemes. Other features and advantages of the present invention will be described in the subsequent specification, and some advantages can be made obvious from the specification or understood by implementing the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The drawings are only for the purpose of showing specific embodiments and are not considered as a limitation to the present invention. Throughout the drawings, the same reference signs represent the same components.

[0050] Figure 1 It is a schematic structural diagram of a pipeline with dual functions of ventilation and power supply according to the present invention;

[0051] Figure 2 It is a schematic structural diagram of the gas path component;

[0052] Figure 3 It is a schematic structural diagram of the first sleeve component;

[0053] Figure 4 It is a schematic structural diagram of the second sleeve component;

[0054] Figure 5 It is a schematic structural diagram of the gas path main body provided with a weak part (annular groove);

[0055] Figure 6 It is a schematic structural diagram of the protection tooling;

[0056] Figure 7 It is a schematic structural diagram of the flow guide part;

[0057] Figure 8 It is a schematic structural diagram of the tool electrode of the present invention;

[0058] Figure 9 It is for Figure 8 The schematic cross-sectional view at A-A in

[0059] Figure 10 It is for Figure 8 The schematic cross-sectional view at B-B in

[0060] Figure 11 It is a schematic structural diagram 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;

[0061] Figure 12 It is a schematic structural diagram 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;

[0062] Figure 13 It is a schematic cross-sectional view when the discharge end of the tool electrode of the present invention is sleeved on the stainless steel tube;

[0063] Figure 14 It is a schematic diagram of the movement track of the center point O2 of the discharge end when the discharge end of the tool electrode in the present invention moves eccentrically around the central axis of the inner cavity of the stainless steel tube;

[0064] Figure 15 It is a schematic diagram of the movement track of any point O3 on the discharge end when the discharge end of the tool electrode in the present invention moves eccentrically around the central axis of the inner cavity of the stainless steel tube;

[0065] Figure 16 It is a schematic structural diagram of the cooperation between the bearing component and the stainless steel tube in the present invention;

[0066] Figure 17 It is a schematic structural diagram of the annular groove of the stainless steel tube in the present invention;

[0067] Figure 18 Schematic diagram of the structure of the equal-height positioning block, clamping plate and stainless steel pipe in the present invention;

[0068] Figure 19 Schematic diagram of the structure of the auxiliary bearing block and the stainless steel pipe in the present invention.

[0069] Reference numerals:

[0070] 1. Gas path assembly; 1-1. Connection main body; 1-2. Gas path main 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 main body; 2-2. First limiting sleeve; 2-3. Connection sleeve; 3. Second sleeve assembly; 3-1. Second sleeve main body 3-1; 3-2. Second limiting sleeve; 4. Thermocouple; 5. Nozzle; 6. Electrical connector; 7. Weak part; 8. Protection tooling; 8-1. Protection main body; 8-2. Compression part; 8-3. Locking part; 8-4. Through slot; 9. Flow guide part; 9-1. Flow guide main body; 9-2. Flow guide cap; 9-3. Flow guide hole; 10. Tool electrode; 11. Workbench surface; 12. Equal-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 movement direction; H1. Wall thickness of the stainless steel pipe; H2. Wall thickness of the annular groove; α. Oblique angle; S 11 、S 12 、S 13 、S 14 、Actual margin clearance values between four points selected on the circular working end of the tool electrode and the outer end face of the stainless steel pipe; S2. Machining clearance; O1. Center point of the discharge end; O2. Center point of the inner cavity of the stainless steel pipe; O3. Point selected on the discharge end. Detailed implementation manners

[0071] The following will specifically describe the preferred embodiments of the present invention with reference to the drawings. The drawings form a part of the present invention and are used together with the embodiments of the present invention to explain the principle of the present invention, rather than to limit the scope of the present invention.

[0072] Embodiment 1

[0073] A specific embodiment of the present invention discloses a pipeline with dual functions of ventilation and power supply, as Figure 1As shown in the figure, it includes a gas path component 1, a first sleeve component 2, a second sleeve component 3, a thermocouple 4, a nozzle 5 and an electrical connector 6. The gas path component 1 is connected to the nozzle 5 to realize the ventilation of the pipeline. The thermocouple 4 is fixed on the gas path component 1, and its free end is connected to the electrical connector 6 to realize the power-on signal of the pipeline. The first sleeve component 2 and the second sleeve component 3 are sleeved outside the gas path component 1 and the thermocouple to protect the gas path component 1 and the thermocouple 4.

[0074] As Figure 2 shown in the figure, the gas path component 1 includes a connection seat and a gas path main body 1-2. The connection seat includes a connection main body 1-1. An axial through hole 1-3 is provided on the connection main body 1-1. One end of the connection main body 1-1 is connected to the gas path main body 1-2, and a first groove 1-4 for placing the thermocouple 4 is provided on the end surface of the other end. The first groove 1-4 is in the shape of a "one" character, and its length is equal to the outer diameter of the connection main body 1-1. The through hole 1-3 is communicated with the first groove 1-4.

[0075] Both the first sleeve component 2 and the second sleeve component 3 are sleeved outside the gas path main body 1-2 and the thermocouple 4 to protect the gas path main body 1-2 and the thermocouple 4, and the second sleeve component 3 is located downstream of the first sleeve component 2.

[0076] In a preferred embodiment, an insulating coating is provided on the end surface of the connection main body 1-1 where the first groove 1-4 is provided, so as to prevent the connection main body 1-1 from conducting with the thermocouple 4.

[0077] A second groove 1-5 is provided on the side surface of the connection main body 1-1. The second groove is parallel to the axis of the connection main body 1-1 and extends from one end of the connection main body 1-1 to the other end. The number of the second grooves 1-5 is two, and both are communicated with the first groove. The two second grooves are symmetrically arranged with respect to the through hole.

[0078] In a possible embodiment, the connection seat further includes a protrusion 1-7. The protrusion is provided at one end of the connection main body 1-1 connected to the gas path main body 1-2, and the protrusion 1-7 is circumferentially arranged along the outer surface of the connection main body 1-1. External threads are provided on the connection main body 1-1 for connection with other components (such as a flow guide). The protrusion plays a limiting role to prevent over-tightening. A radial opening groove is provided on the protrusion 1-7.

[0079] Specifically, the opening groove includes a first opening groove 1-6 and a second opening groove. The number of both the first opening grooves 1-6 and the second opening grooves is two. The two first opening grooves 1-6 and the two second opening grooves are alternately and evenly distributed circumferentially. Two of the first opening grooves 1-6 are respectively communicated with the two second grooves to facilitate the passage of the thermocouple 4. The two second opening grooves are for the overall installation of the pipeline. Exemplarily, the protrusion 1-7 is a flange structure.

[0080] Further, a welding slot (not shown in the figure) is provided at the connection between the connection body 1-1 and the gas path body 1-2. Through the above arrangement, the welding between the connection body 1-1 and the gas path body 1-2 can be made more reliable.

[0081] The other end of the gas path body 1-2 is connected to the nozzle 5. Specifically, the gas path body 1-2 is a stainless steel pipe with a diameter of 2 mm and a wall thickness of 0.5 mm.

[0082] As Figure 3 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 in a hollow tubular shape and is sleeved outside the gas path body 1-2 for protecting the gas path body 1-2 and the thermocouple 4. The first limiting sleeve 2-2 is in a hollow tubular shape and is sleeved outside the first sleeve body 2-1 for positioning and limiting the first sleeve body 2-1 on the cabin body, thereby positioning and limiting the gas-electric dual-functional pipeline on the cabin body. Specifically, the bottom of the limiting part of the first limiting sleeve 2-2 is smeared and adhered to the cabin wall. The connecting sleeve 2-3 is sleeved outside the first sleeve body 2-1 and at one end of the first sleeve body 2-1 and is connected to the connection body 1-1.

[0083] In a preferred embodiment, the number of the first limiting sleeves 2-2 is multiple, and the multiple first limiting sleeves are arranged in sequence along the length direction of the first sleeve body 2-1, and a gap is provided between adjacent first limiting sleeves for installing and limiting other components, so as to achieve the purpose of reasonably utilizing space and arranging components in an orderly manner. The size of the gap can be determined according to the components to be installed and limited.

[0084] In a possible embodiment, 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.

[0085] In addition, the connecting sleeve 2-3 is fixedly connected to the connection body 1-1, thereby realizing the connection between the first sleeve assembly 2 and the gas path assembly 1.

[0086] In a specific embodiment, the first sleeve body 2-1 is a stainless steel pipe with a diameter of 5 mm and a wall thickness of 0.8 mm.

[0087] The second sleeve assembly 3 is arranged downstream of the first sleeve assembly 2 to achieve segmented protection. As Figure 4 shown, it includes a second sleeve body 3-1 and a second limiting sleeve 3-2. The second sleeve body 3-1 is in a hollow tubular shape and is arranged outside the gas path body 1-2 for protecting the gas path body 1-2 and the thermocouple 4. The second limiting sleeve 3-2 is in a hollow tubular shape and is sleeved outside the second sleeve body 3-1 for limiting the second sleeve body 3-1 on the cabin body.

[0088] Specifically, the second sleeve body 3-1 is a stainless steel tube with a diameter of 4 mm and a wall thickness of 0.3 mm.

[0089] The second limiting sleeve 3-2 is a stainless steel tube with a diameter of 5 mm and a wall thickness of 0.5 mm.

[0090] In a preferred embodiment, as Figure 5 shown, a weak part 7 is provided between the gas path body 1-2, the first sleeve assembly 2 and the second sleeve assembly 3 to facilitate the breaking and falling off of the pipeline after the corresponding functions are completed. Specifically, the weak part 7 is an annular groove provided along the circumferential direction of the outer surface of the gas path body 1-2, that is, the wall thickness of the gas path body 1-2 at the location where the weak part is provided is smaller than the wall thickness of the gas path body 1-2 at the location where the weak part is not provided. For example, the wall thickness of the gas path body 1-2 where the weak part is not provided is 0.5 mm, while the wall thickness of the gas path body 1-2 where the weak part is provided is 0.2 mm, and the depth of the annular groove is 0.3 mm.

[0091] The thermocouple 4 is used to transmit electrical signals, and nodes are provided thereon, and the nodes are used to generate and send electrical signals. An insulating part is sleeved outside the thermocouple 4. The thermocouple 4 is filamentous, preferably platinum-rhodium wire. The nodes are placed at the connection of the first groove and the through hole and are suspended. The advantage of the above setting is that: the gas can enter the through hole and the gas path body through the gap between the nodes and the connecting seat to realize the ventilation function.

[0092] In a possible way, the thermocouple 4 on both sides of the node is respectively fixed in two second grooves, and the free end of the thermocouple 4 is connected to the electrical connector 6. Exemplarily, the thermocouple 4 is fixed in the second groove by an adhesive bonding method. The selected adhesive can be J303 glue.

[0093] Specifically, the material of the insulating part is alumina ceramic. The advantage of using alumina ceramic is that: since the application environment of the pipeline of the present invention is a high-temperature environment, and alumina has good high-temperature resistance and will not age due to high temperature, it can play a good insulating effect.

[0094] In a preferred way, the insulating part includes a plurality of insulating units, and the plurality of insulating units are arranged in sequence along the length direction of the thermocouple 4. Sectional setting. In this embodiment, by setting the insulating part to include a plurality of insulating units, the sectional setting of the insulating part is realized, which is convenient for subsequent bending and forming of the pipeline, and the insulating part is not easily damaged during the bending and forming process. Exemplarily, the 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 material of the insulating unit is alumina ceramic.

[0095] Since the front end of the gas path component is in a high-temperature environment, the connecting seat at the front end of the gas path component is made of a high-temperature-resistant alloy material, the main body of the gas path is made of stainless steel, the circuit part uses a thermocouple (platinum-rhodium wire) to transmit electrical signals, and the electrical connector is used to send electrical signals at the end. Therefore, during the pipeline design and manufacturing process, it is required that the circuit part and the gas path part be insulated. At the same time, it is also required that the pipeline components have the functions of limiting and positioning assistance in a narrow cabin to meet the final use requirements.

[0096] In addition, the pipeline with dual functions of ventilation and power supply in this embodiment further includes a flow guide member 9. The flow guide member 9 is provided at the end of the connection main body 1-1 where there is a first groove 1-4, and is used to guide the airflow into the through hole of the connection main body 1-1. As Figure 7 shown, the flow guide member 9 includes a flow guide main body 9-1 and a flow guide cap 9-2 provided at one end of the flow guide main body 9-1.

[0097] The flow guide main body 9-1 is cylindrical, and is provided with a flow guide hole 9-3 that penetrates the flow guide main body 9-1 and the flow guide cap 9-2. The flow guide hole is axially arranged and is a through hole. An internal thread is provided in the flow guide hole 9-3 to achieve threaded connection with the connection main body 1-1. After the flow guide member is installed on the connection main body 1-1, the end face of the flow guide cap 9-2 is higher than the end face of the connection main body 1-1 where the first groove is provided, so as to form a flow guide channel. The gas first enters the flow guide channel and then is guided into the through hole of the connection main body 1-1.

[0098] Embodiment 2

[0099] Another specific embodiment of the present invention discloses a forming method for a gas-electric dual-function pipeline, which is used to form the pipeline with dual functions of ventilation and power supply in Embodiment 1.

[0100] Before forming the gas-electric dual-function pipeline, each component is first processed and formed, such as the connecting seat, the first sleeve assembly, the second sleeve assembly, etc. After each component is processed and formed, the whole gas-electric dual-function pipeline is not integrally formed first, but each component is assembled first. After ensuring that each component can be assembled smoothly, the whole gas-electric dual-function pipeline is integrally formed.

[0101] For the processing of the connecting seat, refer to Embodiment 3. The forming of the first sleeve assembly 2 and the second sleeve assembly 3 will be introduced separately below.

[0102] The first sleeve assembly 2 is formed by the following method:

[0103] Step 1: Calculate the length of the first sleeve main body 2-1, saw and cut the material, and remove the burrs at the flat end;

[0104] Step 2: Cut a plurality of first limiting sleeves 2-2, saw and cut the material, and remove the burrs at the flat end;

[0105] Step 3: Machining and forming the connecting sleeve 2-3;

[0106] Step 4: Mark lines on the first sleeve body, and by means of cold welding, weld multiple first limiting sleeves 2-2 and the first sleeve body 2-1 into a whole. When welding each first limiting sleeve, only weld four points at the front, back, top and bottom, and ensure firm welding. Control the welding current to avoid the formation of welding beads inside the first sleeve body 2-1 during welding;

[0107] Step 5: Sleeves the connecting sleeve on one end of the first sleeve body and welds it; the welding method is the same as that in Step 4.

[0108] The second sleeve assembly 3 is formed by the following method:

[0109] Step 1: Calculate the length of the second sleeve body 3-1, saw and cut the material, and remove burrs at the flat ends;

[0110] Step 2: Cut the second limiting sleeve 3-2 by wire cutting, and remove burrs at the flat ends;

[0111] Step 3: Sleeve the second limiting sleeve 3-2 on the second sleeve body 3-1 and weld it; note that during welding, due to the too thin pipe wall, the pipe wall is likely to be welded through, and a copper bar needs to be padded inside.

[0112] The assembly method of the gas-electric dual-function pipeline includes the following steps:

[0113] Step 1: Connect the gas path body with the connecting seat to obtain the gas path assembly.

[0114] Step 2: Sleeve the insulating part on the outside of the thermocouple and fix the thermocouple on the connecting seat. Specifically as follows:

[0115] Step 21: Place the node of the thermocouple at the communication part of the first groove and the through hole on the connecting body of the connecting seat and set it in suspension;

[0116] Step 22: Sleeve multiple insulating units on the thermocouple in sequence, so as to sleeve the insulating part on the thermocouple;

[0117] Step 23: Fix the thermocouple in the second groove on the connecting body.

[0118] Step 3: Sleeve the sleeve assembly on the outside of the gas path body and the thermocouple. Specifically as follows:

[0119] Step 31: Sleeve the first sleeve assembly on the outside of the gas path body and the thermocouple;

[0120] Step 32: Sleeve the second sleeve assembly on the outside of the gas path body and the thermocouple, downstream of the first sleeve assembly.

[0121] Further, step 31 further includes: during the process of sleeving the first sleeve assembly, if an insulating unit is damaged, the damaged insulating unit is removed, and the subsequent insulating units are smoothed and then sleeved again.

[0122] Step 4: Connect the gas path main body to the connection nozzle.

[0123] Step 5: Connect the free end of the thermocouple to the electrical connector to obtain a gas-electric dual-functional pipeline.

[0124] The forming method of the gas-electric dual-functional pipeline in this embodiment includes the following steps:

[0125] Step 1: Insert one end of the gas path main body 1-2 with an axial through-hole into the welding slot of the connection main body 1-1, and weld it with argon arc welding to integrate the two into a gas path assembly 1. During welding, a 10-mm margin is left between the gas path main body 1-2 and the connection main body 1-1, aiming to meet the minimum pipeline size for ventilation and forming functions.

[0126] Step 2: Weld the other end of the gas path main body 1-2 to the connection nozzle 5, and conduct a positive-pressure airtightness test on the gas path assembly 1 to check the airtightness of the weld between the connection main body 1-1 and the gas path main body 1-2. After the airtightness is qualified, use a 0.5-mm iron wire to check the passability of the weld to ensure that the through-hole on the connection main body can conduct air after welding. Ensure that the through-hole on the connection main body can conduct air after welding, and remove the connection nozzle 5 and the reserved margin to ensure smooth sleeving in the subsequent process. If the airtightness is unqualified, find the cause until the airtightness is qualified.

[0127] Step 3: Fix the thermocouple on the gas path main body.

[0128] Spray an insulating coating on the end face of the connection main body 1-1 with the first groove 1-4, place the node of the thermocouple 4 at the connection between the first groove 1-4 and the through-hole 1-3 on the connection main body 1-1, and set it suspended. Then, sleeve the insulating part on the thermocouple 4. After that, bond and fix the thermocouple 4 in the first groove 1-4 on the end face of the connection main body 1-1 and the second groove 1-5 on the side of the connection main body with J303 glue. After bonding, measure the insulation between the thermocouple 4 and other metal parts of the pipeline.

[0129] Step 4: After confirming the insulation between the thermocouple 4 and other metals of the pipeline, sleeve the first sleeve assembly 2 outside the gas path main body 1-2 and the thermocouple 4. Specifically as follows:

[0130] For dual - person operation, straighten the thermocouple 4, and slowly slide the first sleeve assembly 2 onto it. During the sliding process, if it is found that a certain insulation unit outside the thermocouple 4 is damaged, the first sleeve assembly 2 can be slowly removed, the damaged insulation unit can be removed, and then the subsequent insulation units can be smoothed out and slid on again. During the entire sliding process, the thermocouple 4 must not be bent or damaged. After sliding on, measure the resistance to ensure the insulation between the thermocouple 4 and other metal parts of the pipeline. If there is no insulation, remove the first sleeve assembly 2 and slide it on again. After confirming insulation, weld the first sleeve assembly 2 and the connection main body 1 - 1. After welding, measure the resistance again to confirm whether there is insulation. If there is no insulation, find the reason until insulation is achieved.

[0131] Step 5: Slide the second sleeve assembly 3 onto the outside of the gas path main body 1 - 2 and the thermocouple 4, downstream of the first sleeve assembly 2. The precautions during sliding are the same as those for sliding on the first sleeve assembly 2. After sliding on, measure the resistance to ensure the insulation between the thermocouple 4 and the remaining metal parts of the pipeline. After confirming insulation, weld the second sleeve assembly 3 and the gas path main body 1 - 2. After welding, measure the resistance again to confirm whether there is insulation. If there is no insulation, find the reason until insulation is achieved.

[0132] Step 6: Bend the first sleeve assembly 2 and the second sleeve assembly 3 into the required shape according to the design requirements. When bending, it should be slow and careful. After bending, measure the resistance to ensure the insulation between the thermocouple 4 and the remaining metal parts of the pipeline. Bond and fix the first sleeve assembly 2 and the second sleeve assembly 3 with J303 glue to obtain a pipeline with both gas and electricity functions.

[0133] Step 7: Conduct an airtightness test on the pipeline with both gas and electricity functions.

[0134] Since the thermocouple 4 is bonded in the second groove 1 - 5 of the connection main body 1 - 1 at this time, it is difficult to conduct a positive - pressure airtightness test. In a preferred embodiment, therefore, all parts in front of the weld at the nozzle 5 can be placed in the airtight test piece, and the mouth is sealed with sealant clay, and the airtightness test is carried out by means of negative pressure pumping. Specifically, the airtight test piece can be a vacuum bag.

[0135] Step 8: Connect the free end of the thermocouple 4 to the electrical connector 6, measure the resistance, and ensure the insulation between the thermocouple 4 and the remaining metal parts of the pipeline.

[0136] Embodiment III

[0137] A specific embodiment of the present invention discloses a pipeline connection seat, as Figure 2 shown. The pipeline connection seat includes a connection main body 1 - 1 and a protrusion 1 - 7 for passing gas and placing the thermocouple.

[0138] The structure of the connection body 1-1 is the same as that in the first embodiment. An axial through hole 1-3 is provided on the connection body 1-1. One end of the connection body 1-1 is connected to the gas path body 1-2, and a first groove 1-4 for placing the thermocouple 4 is provided on the end face of the other end. The first groove 1-4 is in a "one" shape, and its length is equal to the outer diameter of the connection body 1-1. The through hole 1-3 is communicated with the first groove 1-4.

[0139] In a preferred embodiment, an insulating coating is provided on the end face of the connection body 1-1 where the first groove 1-4 is provided, so as to prevent the connection body 1-1 from conducting electricity with the thermocouple 4.

[0140] In addition, an external thread is provided on the connection body 1-1 for connection with other components (such as a flow guiding member). The connection body 1-1 is made of a high-temperature resistant alloy material.

[0141] Further, a second groove 1-5 for placing the thermocouple 4 is provided on the side surface of the connection body 1-1. The second groove is parallel to the axis of the connection body 1-1 and extends from one end of the connection body 1-1 to the other end. The number of the second grooves 1-5 is two, and both are communicated 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 path body 1-2 and is located outside the gas path body 1-2, and continues to extend along the length direction of the gas path body 1-2.

[0142] A protrusion 1-7 is provided at one end of the connection body 1-1 and is arranged circumferentially along the outer surface of the connection body 1-1. The protrusion plays a limiting role to prevent over-tightening. The end of the connection body 1-1 where the protrusion 1-7 is provided is connected to the gas path body 1-2.

[0143] In a possible embodiment, a radial opening groove is provided on the protrusion 1-7. The opening groove is used for the thermocouple to pass through and for the installation of the pipeline. Specifically, the opening groove includes a first opening groove 1-6 and a second opening groove. The number of both the first opening groove 1-6 and the second opening groove is two. The two first opening grooves 1-6 and the two second opening grooves are alternately and evenly distributed circumferentially. Two of the first opening grooves 1-6 are respectively communicated with the two second grooves to facilitate the passage of the thermocouple 4. The two second opening grooves are used for the overall installation of the pipeline. Exemplarily, the protrusion 1-7 is a flange structure.

[0144] Embodiment 4

[0145] Another specific embodiment of the present invention discloses a processing method for a connection seat of a gas-electric dual-functional pipeline, which is used to process the connection seat of the first embodiment, and includes the following steps:

[0146] Step 1: Use a lathe to turn out the outer shape of the connection seat, that is, the connection body, the protrusion at one end of the connection body, and the external thread on the connection body.

[0147] Step 2: Machine the through hole on the connecting body.

[0148] Taking the other end of the connecting body (i.e., the end face excluding the end with the protrusion) as the reference, machine the through hole on the connecting body by electrical discharge machining.

[0149] Step 3: Machine the second grooves on both sides of the connecting body, the opening grooves on the protrusion, and the first groove on the connecting body, which specifically includes the following steps:

[0150] Using the same reference as in Step 2, that is, still taking the other end of the connecting body (i.e., the end face excluding the end with the protrusion) as the reference. First, machine the second grooves on both sides of the connecting body and the two first opening grooves on the protrusion simultaneously by electrical discharge machining; second, machine the two second opening grooves on the protrusion by electrical discharge machining; finally, machine the first groove on the connecting body by electrical discharge machining.

[0151] During machining, it is necessary to strictly control the dimensional tolerances of the first groove and the second groove so that the thermocouple sleeved with the insulating part (aluminum oxide ceramic) will not protrude from the groove after being placed in the groove.

[0152] Embodiment Five

[0153] Since the weak part 7 is provided on the gas path body 1-2, during subsequent turnover and machining processes, it is extremely easy to cause fracture at the weak part. Based on the above considerations, this embodiment provides a protection tooling 8 for protecting the weak part in Embodiment One.

[0154] As Figure 6 shown, the protection tooling includes a protection main body 8-1 and a pressing member 8-2. The protection main body 8-1 is used to accommodate the weak part 7 on the gas path body 1-2, and the pressing member 8-2 is used to fix the gas path body 1-2 in the protection main body 8-1 to achieve the fixation of the weak part 7. The pressing member 8-2 is sleeved on the protection main body 8-1.

[0155] Specifically, one end of the protection main body 8-1 is closed, and a through groove 8-4 along the radial direction of the protection main body 8-1 is provided thereon. One end of the gas path body 1-2 passes through the through groove 8-4 until the weak part 7 is located in the through groove 8-4.

[0156] Considering that the gas path main body 1-2 is relatively long, if one end of the gas path main body 1-2 needs to pass through the through slot to place the weak part in the through slot, the operation is inconvenient. Therefore, in a preferred embodiment, the through slot 8-4 extends from one end of the protection main body 8-1 to the other end of the protection main body 8-1, so that the other end of the protection main body 8-1 is an open end. Since the through slot 8-4 extends from one end of the protection main body 8-1 to the other end of the protection main body 8-1, during use, there is no need to pass one end of the gas path main body 1-2 through the through slot. Only by entering the weak part 7 from the opening at the other end of the protection main body 8-1 can the weak part 7 be located in the through slot 8-4, greatly improving the convenience of the operation.

[0157] In a possible embodiment, the pressing member 8-2 is provided with a through hole for the protection main body to pass through. The pressing member 8-2 and the protection main body 8-1 are threadedly connected. Exemplarily, the outer surface of the protection main body is provided with an external thread, and the through hole of the pressing member is provided with an internal thread.

[0158] Preferably, the protection tooling further includes a lock prevention member 8-3. The lock prevention member 8-3 is provided on the outer side of the pressing member 8-2, near the open end of the protection main body 8-1, and is used to prevent the pressing member 8-2 from loosening, thereby preventing the weak part from moving out of the through slot 8-4 of the protection main body 8-1. The structure of the lock prevention member 8-3 can be the same as that of the pressing member, or other structures can be adopted as long as it can play a role in preventing the pressing member from loosening.

[0159] In order to reduce the processing difficulty, the protection main body 8-1 of this embodiment can adopt a bolt, and an axial through slot that radially penetrates can be machined along the length direction on the screw rod. Both the lock prevention member and the pressing member can adopt nuts.

[0160] Embodiment Six

[0161] Another specific embodiment of the present invention provides a method for machining an annular groove for machining the weak part of the gas-electric dual-functional pipeline in Embodiment One.

[0162] This embodiment adopts an electric discharge machining method to solve the problem that it is difficult to achieve high-precision machining of annular grooves on ultra-thin and long tubular parts.

[0163] Specifically, the method includes machining an annular groove on the surface to be machined by using the working states of a plurality of electric discharge machining points of the tool electrode arranged circumferentially around the workpiece to be machined.

[0164] Among them, the same electric discharge machining point includes a working state and a non-working state. When the distance between the electric discharge machining point and the surface to be machined is greater than the threshold value, the electric discharge machining point is in the non-working state;

[0165] When the distance between the electric discharge machining point and the surface to be machined is less than or equal to the threshold value, the electric discharge machining point is in the working state;

[0166] Among them, the threshold value is the discharge distance between the electric discharge machining point that meets the machining requirements and the surface to be machined.

[0167] Among them, the discharge end 101 includes a plurality of electric discharge machining points arranged circumferentially around the workpiece to be machined. The plurality of electric discharge machining points arranged circumferentially around the workpiece to be machined can be continuously and uninterruptedly distributed circumferentially around the workpiece to be machined, or can be discontinuously distributed circumferentially around the workpiece to be machined, as long as the continuous machining and forming of the annular groove on the surface to be machined can be realized.

[0168] In a possible implementation manner, one end of the above tool electrode 10 is circular ring-shaped. That is to say, a plurality of electric discharge machining points arranged circumferentially around the workpiece to be machined form a continuous circular ring shape, as Figures 8 - 13 shown. The inner circular end of the circular ring matches the shape of the annular groove, that is, the inner circular end is convex, the annular groove is concave, and the cross-sectional dimension of the convex shape is the same as the cross-sectional shape of the concave shape; the other end of the tool electrode 10 is the conductive end 104, which is electrically connected to an output end of a power supply device arranged on the machine tool to introduce current and transmit the current to the inner circular end. At this time, the inner circular end is the discharge end 101, so as to realize the machining of the annular groove on the surface to be machined through the working state of a plurality of electric discharge machining points arranged circumferentially around the workpiece to be machined at the discharge end 101.

[0169] In a possible implementation, the above-mentioned discharge end 101 is of a rigid structure, and the discharge end 101 is sleeved on the outer end face of the gas path main body 1-2. Specifically, the gas path main body 1-2 is a stainless steel pipe. During processing, the stainless steel pipe 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 stainless steel pipe; 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 to-be-machined end face of the stainless steel pipe is constantly changing; when the distance between the electric discharge machining point and the to-be-machined surface is greater than the threshold value, the electric discharge machining point is in a non-working state, and at this time, this electric discharge machining point is the non-working end 103; when the distance between the electric discharge machining point and the to-be-machined surface is less than or equal to the threshold value, the electric discharge machining point is in a working state, and at this time, this electric discharge machining point is the working end 102. In this way, the transformation between the working state and the non-working state is realized at the same electric discharge machining point, and the working states of all the electric discharge machining points jointly realize the machining of the annular groove on the to-be-machined surface. That is to say, the position of the working end 102 is constantly changing within the inner circular end face of the discharge end 101, and the circular discharge end of the tool electrode moves eccentrically around the central axis of the inner cavity of the stainless steel pipe for one week, and all the working ends form a continuous circular discharge end around the circumference of the to-be-machined part. In this way, the discharge end 101 of the tool electrode 10 is prevented from being in a continuous machining state, thereby reducing the loss of the tool electrode 10.

[0170] Among them, the circular discharge end 101 of the tool electrode 10 includes a plurality of working ends 102 distributed annularly. When the discharge end moves eccentrically around the central axis of the inner cavity of the stainless steel pipe for machining, the plurality of working ends 102 are in a non-synchronous and non-continuous machining state; and the machining trajectories of the plurality of working ends jointly constitute the annular groove of the to-be-machined part.

[0171] Specifically, after the tool electrode 10 moves eccentrically for one week, all the end faces of the discharge end 101 participate in the electric discharge machining, that is, all the working ends 102 constitute the complete discharge end 101, and the machining trajectories of all the working ends 102 constitute the annular groove of the stainless steel pipe; along the deflection movement direction of the tool electrode 10, the working end 102 shows a "circular motion" phenomenon on the discharge end 101, that is, at different times, the positions of the working end 102 are different. In this way, all the working ends 102 are alternately and orderly machined, and the machining direction 16 is the circumferential direction around the outer end face of the stainless steel pipe, and the plane where this circumferential direction is located is perpendicular to the central axis of the inner cavity of the stainless steel pipe.

[0172] Among them, the judgment criterion for whether the discharge end 101 is the working end 102 is whether the distance between the discharge end 101 and the to-be-machined surface of the stainless steel pipe is greater than 50 μm. If not, then this discharge end 101 is the working end 102. If so, then this discharge end 101 is the non-working end 103.

[0173] Specifically, the tool electrode 10 is installed on a machine tool. During machining, the machine tool drives the tool electrode 10 to perform eccentric motion. In this way, the discharge end 101 of the tool electrode realizes 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.

[0174] Specifically, before the tool electrode 10 performs eccentric motion, it is necessary to adjust the center of the inner circular end of the discharge end 101 of the tool electrode 10 to coincide with the central axis 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, that is, the diameter dimension of the inner circular end of the discharge end 101 is larger than the outer diameter dimension of the stainless steel tube. Exemplarily, the diameter of the inner circular end is 10 - 20 mm, which is 5 - 10 times the outer diameter of the stainless steel tube. In this way, during the electrical discharge machining process, it is convenient to determine the value of the unilateral feed amount O1O2.

[0175] Among them, the unilateral feed amount O1O2 satisfies:

[0176] O1O2 = S1 + (H1 - H2) - S2

[0177] Among them, O1 represents the center point of the discharge end 101 of the tool electrode 10;

[0178] O2 represents the center point of the inner cavity of the stainless steel tube;

[0179] H1 is the wall thickness of the stainless steel tube;

[0180] H2 is the wall thickness of the annular groove;

[0181] S1 is the margin gap between the discharge end 101 and the outer end face of the stainless steel tube;

[0182] S2 is the machining gap, that is, the closest distance between the working end 102 and the end face of the stainless steel tube 01 when the tool electrode 10 performs eccentric motion.

[0183] Among them, S1 satisfies:

[0184]

[0185] Among them, S 11 、S 12 、S 13 、S 14 are the actual margin gap values between four points selected on the discharge end 101 of the tool electrode 10 and the outer end face of the stainless steel tube, and these four points are evenly distributed on the discharge end 101.

[0186] Exemplarily, S 11 、S 12 、S 13 、S 14They are 2.055 mm, 2.060 mm, 2.065 mm, and 2.050 mm respectively. At this time, S1 = 2.058 mm.

[0187] Among them, the machining gap S2 takes a value of 10 - 50 μm to meet the requirements of electrical discharge machining.

[0188] Exemplarily, S2 = 10 μm; H1 = 0.5 mm, H2 = 0.3 mm, S1 = 2.058 mm. At this time, O1O2 = 2.248 mm.

[0189] Among them, the automatic centering module on the machine tool can be used to measure S 11 、S 12 、S 13 、S 14 Among them, if the four values are equal, the center of the inner circle end of the discharge end 101 of the tool electrode 10 coincides with the central axis of the inner cavity of the stainless steel tube.

[0190] Among them, after using the machine tool to adjust the center 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, the actually measured S 11 、S 12 、S 13 、S 14 The closer the four values are, the more accurate the value of S1 is, and further the more accurate the unilateral feed amount O1O2 is. In this way, during the eccentric movement of the tool electrode 10, the accuracy of the machining gap can be ensured, and further the machining depth of the working end 102 can be guaranteed to ensure the dimensional accuracy of the machined annular groove.

[0191] Specifically, after adjusting the center 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, the machine tool is used to drive the tool electrode 10 to perform eccentric movement. The detailed process is as follows.

[0192] The movement trajectories of the center point O1 of the discharge end 101 of the tool electrode 10 and the center point O2 of the inner cavity of the stainless steel tube are described as follows:

[0193] Move the tool electrode 10 so that O1 moves away from O2, and the moving distance is the same as the unilateral feed amount O1O2. At this time, the distance between O1 and O2 is O1O2;

[0194] With O2 as the center and O1O2 as the radius, rotate O1 around O2. At this time, the moving trajectory of O1 is a circle, as Figure 14 shown. The center of this circle is O2, and the radius is O1O2;

[0195] Among them, during the process of moving O1, when the closest distance between the end face of the discharge end 101 and the surface of the stainless steel tube reaches 10 μm, the power supply device is turned on to supply pulsed 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 0.04 g / min until the distance between O1 and O2 is O1O2, and then O1 makes a circular motion around O2.

[0196] To further illustrate the movement trajectory of the tool electrode 10, any point O3 on the discharge end 101 is selected, and the trajectory of O3 is described as follows:

[0197] Move the tool electrode 10 so that O3 moves towards O2, and the moving distance is O1O2;

[0198] When O1 rotates around O2, at this time, as Figure 15 shown, the trajectory of O3 is: a circle with the initial position of O3 as the center and O1O2 as the radius;

[0199] Among them, during the process of moving O3, when the closest distance between the end face of the discharge end 101 and the surface of the stainless steel tube reaches 10 μm, the power supply device is turned on to supply pulsed 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 0.04 g / min until the moving distance of O3 reaches O1O2, and then O3 makes a circular motion with its initial position as the center.

[0200] In this way, 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, and 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. Furthermore, 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.

[0201] Among them, there is a margin gap between the discharge end 101 and the outer end face of the stainless steel tube 01 to ensure that the non - processing gap between the non - working end 103 at the discharge end 101 and the end face of the stainless steel tube is large enough, so as to ensure that the pulsed voltage released at the non - working end 103 cannot etch the metal on the surface of the stainless steel tube. In this way, during the eccentric movement of the tool electrode 10, the dynamic transformation between the working end 102 and the non - working end 103 can be realized.

[0202] Among them, the conductive end 104 of the tool electrode 10 is electrically connected to an output end of a power supply device arranged on the machine tool, and the stainless steel tube is electrically connected to the other output end of the power supply device. Among them, the power supply device includes a pulsed power supply, and its two output ends are respectively connected to the positive and negative electrodes of the pulsed power supply to output pulsed voltage.

[0203] 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. Exemplarily, the medium is kerosene, mineral oil or deionized water. When a pulsed 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 current conditions is broken down to form 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 W / mm), and the instantaneous high temperature generated in the discharge area is sufficient to melt and even evaporate the metal on the surface of the stainless steel tube, resulting in the formation of a small pit. After the first pulsed discharge ends, after a very short interval, the second pulse discharges by breaking down the closest point between the other two electrodes. Thus, it cycles repeatedly at a high frequency. The tool electrode 10 continuously feeds towards the stainless steel tube, and its shape is finally replicated on the stainless steel tube to form the required processed surface. During the processing, although a small part of the total energy is also released to the tool electrode 10, causing loss of the tool electrode 10, however, by the eccentric movement of the discharge end 101 of the tool electrode 10 around the inner cavity central axis of the stainless steel tube, the working end 102 at the discharge end 101 is constantly changing its position. In this way, by avoiding continuous processing of the working end 102, the loss of the tool electrode 10 is reduced. Furthermore, at each moment of processing, the working end 102 of the discharge end 101 maintains a relatively complete shape, improving the processing accuracy.

[0204] Exemplarily, during the processing, the electrical parameters satisfy:

[0205] Pulse width 30 - 60 μs, pulse interval 20 - 30 μs, average machining current 0.8 - 2 A, average machining voltage 30 - 60 V.

[0206] Specifically, during processing, the machine tool controls the eccentric movement of the tool electrode 10 while the stainless steel tube remains stationary.

[0207] Among them, the tool electrode 10 is connected to a driving device provided on the machine tool. The driving device includes a transmission rod 15. During processing, the machine tool controls the swing of the transmission rod 15. Furthermore, the tool electrode 10 is driven by the transmission rod 15 to perform eccentric movement;

[0208] Specifically, the transmission rod 15 swings clockwise in the swing plane ZY, and the swing plane ZY is parallel to the plane where the discharge end 101 is located. In this way, the eccentric movement of the tool electrode 10 around the inner cavity central axis of the stainless steel tube is realized.

[0209] Exemplarily, during the processing, the non-electrical parameters satisfy:

[0210] The swing speed of the transmission rod 15 is 0.4 - 0.6 rpm, the machining gap is 10 - 50 μm, the machining speed is 0.02 - 0.045 g / min, and the unilateral feed amount is 2.214 - 2.316 mm.

[0211] Specifically, as Figure 16 shown, the stainless steel pipe is placed on the equal-height positioning blocks 12 and the auxiliary bearing blocks 13 to clamp the stainless steel pipe.

[0212] Among them, two equal-height positioning blocks 12 are used to clamp both sides of the position to be machined of the stainless steel pipe respectively, so as to ensure the stability of the position to be machined of the stainless steel pipe during the machining process. Exemplarily, the distance between the two equal-height positioning blocks 12 is 30 mm.

[0213] Among them, the two equal-height positioning blocks 12 are placed between the two auxiliary bearing blocks 13, and the two auxiliary bearing blocks 13 are used to support and position both ends of the stainless steel pipe, further ensuring the stability of the stainless steel pipe during the machining process.

[0214] Among them, as Figures 18 - 19 shown, the upper end faces of the above-mentioned equal-height positioning blocks 12 and the auxiliary bearing blocks 13 are flush, and V-shaped grooves are provided on the upper end faces of the equal-height positioning blocks 12 and the auxiliary bearing blocks 13. The stainless steel pipe is placed in the V-shaped groove to limit the stainless steel pipe.

[0215] Furthermore, the clamping plate 14 is covered on the V-shaped groove and clamped on the equal-height positioning blocks 12 to limit the stainless steel pipe, further improving the stability of the stainless steel pipe. Exemplarily, the angle of the V-shaped groove is 60° - 90°, and the depth is 5 - 10 mm.

[0216] Among them, before placing the stainless steel pipe on the equal-height positioning blocks 12, it is first necessary to use the machine tool to perform center alignment on the tool electrode 10, then insert the stainless steel pipe into the discharge end 101 of the tool electrode 10, and finally use the equal-height positioning blocks 12, the auxiliary bearing blocks 13 and the clamping plate 14 to clamp the stainless steel pipe, and perform alignment on the stainless steel pipe through the equal-height positioning blocks 12 and the auxiliary bearing blocks 13.

[0217] Specifically, after the tool electrode 10 is aligned, the positions of the equal-height positioning blocks 12 and the auxiliary bearing blocks 13 on the machine tool are adjusted by using the XYZ axes of the machine tool to align the stainless steel pipe, ensuring that the central axis of the inner cavity of the stainless steel pipe coincides with the center line of the discharge end 101 of the tool electrode 10, so as to determine the value of the unilateral feed amount O1O2, thereby improving the machining accuracy.

[0218] Among them, the alignment process of the stainless steel pipe is as follows.

[0219] First, fix two equal-height positioning blocks 12 and two auxiliary bearing blocks 13 on the workbench 9 of the machine tool. Then, use a dial indicator to align the side surface parallel to the X-axis of the machine tool, with the parallelism error ≤ 0.01 mm.

[0220] Before placing the stainless steel pipe on the equal-height positioning block 12, first insert the stainless steel pipe into the discharge end 101 of the tool electrode 10. Then, place the stainless steel pipe on the equal-height positioning block 12 and the auxiliary bearing block 13. In this way, the alignment of the stainless steel pipe is achieved through the equal-height positioning block 12 and the auxiliary bearing block 13.

[0221] One end of the transmission rod 15 is connected to the tool electrode 10 and is parallel to the central axis of the discharge end 101 of the tool electrode 10. During the machining process, the other end of the transmission rod 15 is installed on the machine tool, and the machine tool drives the transmission rod 15 to swing. Then, the transmission rod 15 drives the tool electrode 10 to move, so 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 pipe.

[0222] In this way, when 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 pipe for one week, the machining of the annular groove of the stainless steel pipe can be completed, achieving one-time machining in place, and the machining efficiency is significantly improved.

[0223] Compared with the prior art, the discharge end 101 of the tool electrode 10 of the present invention includes a plurality of electric discharge machining points arranged circumferentially around the workpiece to be machined. The same electric discharge machining point includes a working state and a non-working state. When the tool electrode performs electric discharge machining on the annular groove of the workpiece to be machined, the distance between the electric discharge machining point and the surface to be machined continuously changes, realizing the transition between the working state and the non-working state. The working states of the plurality of electric discharge machining points arranged circumferentially around the workpiece to be machined realize the machining of the annular groove on the surface to be machined. In this way, it is avoided that the discharge end 101 of the tool electrode 10 is in a continuous machining state, thereby reducing the loss of the tool electrode 10.

[0224] A plurality of electric discharge machining points arranged circumferentially around the workpiece to be machined form a continuous circular ring. The inner circular end of the ring matches the shape of the annular groove. It moves eccentrically on the outer end face of the stainless steel tube. During this process, the distance between the inner circular end face of the discharge end 101 and the surface to be machined is constantly changing; when the inner circular end face of the discharge end 101 approaches the surface to be machined, the end face of the discharge end 101 is the working end 102, and when the end face moves away from the surface to be machined, the end face transforms into a non-working end 103, realizing the dynamic transformation between the working end 102 and the non-working end 103. Thus, it is avoided that the working end 102 of the tool electrode 10 is in a continuous machining state, greatly reducing the loss of the working end 102 of the tool electrode 10, achieving a tool electrode 10 loss ≤ 1%, 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.

[0225] The discharge end 101 of the tool electrode 10 of the present invention moves eccentrically on the ultra-thin and long stainless steel tube. During machining, the distance between the discharge end 101 and the ultra-thin and long stainless steel tube changes from large to small and then from small to large. During the process of the distance changing from large to small, metal debris will be generated between the discharge end 101 and the stainless steel tube. At this time, some metal debris will be discharged with the working fluid through the machining gap. During the process of the distance changing from small to large, the distance between the discharge end 101 and the stainless steel tube can increase by nearly 200 times, significantly improving the efficiency of discharging metal debris. Thus, it is avoided that the metal debris accumulates at the discharge end 101 due to untimely discharge, thereby reducing the loss of the tool electrode 10 and avoiding the risk of short circuit caused by the direct connection of the tool electrode 10 to the stainless steel tube through the metal debris.

[0226] By the discharge end 101 of the tool electrode 10 moving eccentrically on the ultra-thin and long stainless steel tube, metal debris can be efficiently discharged, and then electric discharge machining can be carried out with a smaller machining gap. Thus, the machining current and machining voltage values can be reduced, the machining cost is reduced, and an annular groove with a lower surface roughness can be obtained.

[0227] As Figure 17 shown, by adjusting the value of the unilateral feed amount, the machining of annular grooves with different wall thicknesses can be realized. By adjusting the shape of the discharge end 101 of the tool electrode 10, the machining of different bevel angles α can be realized, laying a foundation for the rapid production and batch production of products.

[0228] The discharge end 101 of the tool electrode 10 of the present invention moves eccentrically around the inner cavity central axis of the ultra-thin and long stainless steel tube for one week, and the machining of the annular groove of the ultra-thin and long stainless steel tube can be completed, achieving one-time machining in place, and the machining efficiency is significantly improved.

[0229] By means of the eccentric movement of the discharge end 101 of the tool electrode 10 around the inner cavity central axis of the stainless steel tube, the unilateral 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.

[0230] The shape of the discharge end 101 of the tool electrode 10 is the same as that of the annular groove, that is, the discharge end 101 is in a convex shape, and the annular groove is in a concave shape. The cross-sectional dimension of the convex shape is the same as the cross-sectional shape of the concave shape. Thus, after the discharge end 101 of the tool electrode 10 makes an eccentric movement around the inner cavity central axis of the ultra-thin and long stainless steel tube for one week, the depth and bevel angle of the machined annular groove are the required depth and bevel angle of the annular groove, and the machining accuracy is significantly improved.

[0231] The present invention abandons the traditional turning machining method for ultra-thin and long stainless steel tubes, and uses the working end 102 of the tool electrode 10 to discharge and erode the metal on the surface of the ultra-thin and long stainless steel tube to machine the annular groove. That is, during the machining process, the tool electrode 10 does not contact the surface of the ultra-thin and long stainless steel tube, and will not cause its deformation, overcoming the problem of damage to the ultra-thin and long stainless steel tube caused by the cutting force.

[0232] The present invention uses the eccentric movement of the discharge end 101 of the tool electrode 10 around the inner cavity central axis of the ultra-thin and long stainless steel tube to machine the annular groove on the ultra-thin and long stainless steel tube. That is, during the machining process, the ultra-thin and long stainless steel tube does not need to move, and an annular groove can be machined on its outer surface, overcoming the problem that the coaxiality becomes poor during the rotation of the ultra-thin and long stainless steel tube and affecting the machining accuracy.

[0233] During machining, only need to place the ultra-thin and long stainless steel tube in the V-shaped groove on the equal-height positioning block 12 and the auxiliary bearing block 13, and use the clamping plate 14 to limit the upper surface of the ultra-thin and long stainless steel tube, then the clamping and positioning of the ultra-thin and long stainless steel tube can be realized. The clamping is convenient and can ensure the stability of the ultra-thin and long stainless steel tube during the machining process.

[0234] The specific steps are as follows:

[0235] 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 workbench surface 11 of the machine tool;

[0236] Specifically, the workbench surface 11 of the machine tool is a horizontal plane, the tool electrode 10 is vertically installed on the machine tool and is connected to the transmission rod installed on the machine tool.

[0237] Step 2: Use the bearing assembly to clamp the gas path main body 1-2 and align the gas path main body 1-2;

[0238] Specifically, the gas path main body 1-2 is a stainless steel pipe. First, fix two equal-height positioning blocks 12 and two auxiliary bearing blocks 13 on the workbench surface 11. Use a dial indicator to align the side of the blocks with the X-axis of the machine tool, and use the machine tool to adjust the positions of the equal-height positioning blocks 12 and the auxiliary bearing blocks 13. Among them, the parallelism error ≤ 0.01mm.

[0239] Then place the stainless steel pipe on the equal-height positioning blocks 12. Before placing, pass the stainless steel pipe through the inner circular end at the lower end of the tool electrode 10. Ensure that the stainless steel pipe is in a horizontal position through the equal-height positioning blocks 12. The distance between the two equal-height positioning blocks 12 is 30mm;

[0240] Next, place both ends of the stainless steel pipe on the auxiliary bearing blocks 13, and finally fix it with the clamping plate 14.

[0241] 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 pipe;

[0242] Specifically, first adjust the position of the stainless steel pipe by moving the bearing assembly in the X-axis direction of the machine tool, so that the position to be processed of the stainless steel 6 is located inside the discharge end 101 of the tool electrode 10;

[0243] Next, through the automatic centering module of the machine tool, measure S 11 、S 12 、S 13 、S 14 If the four values are equal or the error is within ±0.02mm, the center of the discharge end 101 of the tool electrode 10 coincides with the central axis of the inner cavity of the stainless steel pipe. If not, continue to adjust the position of the bearing assembly through the machine tool until the requirements are met.

[0244] Step 4: Use kerosene and water as the working fluid, and use the tool electrode 10 to perform electrical discharge machining on the stainless steel pipe in the working fluid.

[0245] Specifically, Step 4 includes the following steps:

[0246] Step 41: Control 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 pipe;

[0247] Specifically, the machine tool drives the transmission rod 15 to swing in the YZ plane, and then controls 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 pipe through the transmission rod 15. The eccentric motion direction 17 is shown in Figure 14 .

[0248] Among them, the swing speed of the transmission rod 15 is 0.5rpm;

[0249] S 11 、S12 , S 13 , S 14 The actual measured values are 2.055 mm, 2.060 mm, 2.065 mm, and 2.050 mm respectively. At this time, S1 = 2.058 mm;

[0250] The machining gap S2 is 10 μm;

[0251] The unilateral feed rate O1O2 = S1 + (H1 - H2) - S2 = 2.058 + (0.5 - 0.3) - 0.01 = 2.248 mm;

[0252] The machining speed is 0.04 g / min.

[0253] Step 42: When the tool electrode 10 performs eccentric movement, power is supplied to the tool electrode 10 to perform electrical discharge machining.

[0254] Specifically, the electrical parameters satisfy:

[0255] Pulse width 40 μs, pulse interval 26 μs, average machining current 1 A, average machining voltage 40 V.

[0256] The above machining method is used to machine the annular grooves of #01 - #10 ultra-thin and long stainless steel pipes, and the machining parameters are shown in Table 1 below.

[0257] Table 1 Machining Parameters

[0258]

[0259] Machining requirements: The wall thickness of the annular groove is 0.3 ± 0.05 mm, and the bevel angle α is 90°. The test results are shown in Table 2 below.

[0260] Table 2 Test Results

[0261]

[0262]

[0263] Among them, the electrode consumption ratio is E / W * 100%, where E is the change in the diameter size of the discharge end of the tool electrode, and W is the initial diameter size of the inner circular end of the tool electrode.

[0264] As can be seen from Table 2, the average value of the groove depth of the annular grooves of the 10 stainless steel pipes processed by the present invention is 0.2146 mm, the standard deviation is 0.01427, and the coefficient of variation is 0.07. The angles of the annular grooves are all 90°. The average value of the wall thickness of the annular grooves 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 on ultra-thin and long stainless steel pipes, and the processed annular grooves have high precision and stability, will not damage the ultra-thin and long stainless steel pipes, and have less loss of the tool electrode.

[0265] Generally, when the ratio of the diameter to the length reaches 1:100 - 150, it belongs to an ultra-thin and long shaft. For example, the outer diameter of the stainless steel pipe used in a certain flight product is 2 mm, the inner diameter is 1 mm, and the length is 1 - 1.2 m. The ratio of the outer diameter to the length of this stainless steel pipe is 1:500 - 600, which belongs to an ultra-thin and long stainless steel pipe. Generally, an annular groove needs to be processed on the ultra-thin and long steel pipe. This annular groove is an annular groove, which is used to separate the guidance system of the flight product from the product fairing when the product reaches the predetermined height and position.

[0266] Due to the small diameter and thin wall thickness of the ultra-thin stainless steel pipe, and the wall thickness at the position of the annular groove is even thinner, such as 0.3 ± 0.05 mm, its important dimensions cannot be obtained by direct measurement; when processing a V-shaped annular groove at a certain position on the ultra-thin and long stainless steel pipe, it is difficult to ensure the wall thickness dimension at the position of the annular groove by using the traditional turning processing method. This is because the longer the length, the greater the centrifugal force caused by the rotation of the workpiece during the rotation process, the worse the coaxiality of the workpiece, and the cutting force generated is likely to cause the ultra-thin and long stainless steel pipe to deform.

[0267] When using the existing electric discharge machining device to process the annular groove of the ultra-thin and long stainless steel pipe, it is necessary to rotate the ultra-thin and long stainless steel pipe, and then use the tool electrode to continuously advance on the surface of the ultra-thin and long stainless steel pipe for processing. However, due to the long length of the ultra-thin and long stainless steel pipe, the greater the centrifugal force caused by the rotation of the workpiece during the rotation process, the worse the coaxiality of the workpiece, and it will also make it difficult to ensure the wall thickness dimension at the position of the annular groove; and during the processing process, a part of the total energy is released to the tool electrode, which will cause tool loss, and the shape of the worn tool electrode is finally replicated on the ultra-thin and long stainless steel pipe, seriously affecting the processing accuracy of the annular groove.

[0268] Due to the thin wall thickness at the position of the annular groove, the requirements for positioning and processing accuracy are relatively high, and its important dimensions cannot be obtained by direct measurement; when processing an annular groove at a certain position on the ultra-thin and long stainless steel pipe, it is difficult to ensure the wall thickness dimension at the position of the annular groove by using the traditional turning processing device, and even if the existing electric discharge machining device is used, it is difficult to ensure the wall thickness dimension at the position of the annular groove.

[0269] The above-mentioned annular groove is completed by the following processing device. The processing device includes a tool electrode 10 installed on a machine tool, a bearing component, and a driving component. Among them, the bearing component is used to clamp the stainless steel pipe, and the driving component is used to drive the tool electrode 10 to eccentrically move around the inner cavity central axis of the stainless steel pipe, so as to realize the electric discharge machining of the annular groove on the stainless steel pipe, and solve the problem that it is difficult to machine the annular groove on the ultra-thin and long stainless steel pipe in the prior art.

[0270] Specifically, one end of the tool electrode 10 is circular, the inner circular end of the circle matches the shape of the annular groove, and 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 arranged on the machine tool to introduce current and transmit the current to the inner circular end. At this time, the inner circular end is a discharge end 101, and the discharge end 101 is sleeved on the outer end face of the stainless steel pipe; during processing, the stainless steel pipe is electrically connected to the other output end of the power supply device, and the discharge end 101 of the tool electrode 10 eccentrically moves around the inner cavity central axis of the stainless steel pipe. Among them, during the eccentric movement of the tool electrode 10, the distance between the end face of the discharge end 101 and the to-be-machined end face of the stainless steel pipe is constantly changing. When the distance is 10 - 50 μm, it is in the working state, that is, the working end 102, and when the distance is greater than 50 μm, it is in the non-working state, that is, the non-working end 103. Among them, the processing trajectories of all the working ends 102 together form the annular groove of the ultra-thin and long stainless steel pipe.

[0271] Among them, the center of the inner circular end of the discharge end 101 of the tool electrode 10 coincides with the inner cavity central axis of the stainless steel pipe, and there is a margin gap between the discharge end 101 and the outer end face of the stainless steel pipe. Among them, the end face diameter of the discharge end 101 is 20 mm, which is 10 times the outer diameter of the stainless steel pipe, so as to facilitate determining the value of the unilateral feed amount O1O2; during processing, the driving component drives the tool electrode 10 to swing. At this time, the discharge end 101 of the tool electrode 10 is in a state of eccentrically moving around the inner cavity central axis of the stainless steel pipe.

[0272] Among them, using the automatic centering module on the machine tool, measure S 11 、S 12 、S 13 、S 14 are 2.055 mm, 2.060 mm, 2.065 mm, 2.050 mm respectively. At this time, S1 = 2.058 mm.

[0273] Among them, S2 = 10 μm; H1 = 0.5 mm, H2 = 0.3 mm, S1 = 2.058 mm. At this time, O1O2 = 2.248 mm.

[0274] Among them, after adjusting the center of the discharge end 101 of the tool electrode 10 to coincide with the inner cavity central axis of the stainless steel pipe, the tool electrode 10 is in an eccentric movement state under the action of the driving component.

[0275] Among them, the conductive end 104 of the tool electrode 10 is electrically connected to an output end of a power supply device arranged on the machine tool, and the stainless steel tube is electrically connected to the other output end of the power supply device. Among them, the power supply device includes a pulse power supply, and its two output ends are respectively connected to the positive and negative electrodes of the pulse power supply for outputting a pulse voltage.

[0276] Among them, during the processing, the electrical parameters satisfy:

[0277] Pulse width 40 μs, pulse interval 26 μs, average machining current 1 A, average machining voltage 40 V.

[0278] Specifically, the above-mentioned driving assembly includes a transmission rod 15. One end of the transmission rod 15 is connected to the tool electrode 10, and the other end of the transmission rod 15 is installed on the machine tool. The machine tool can control the swing of the transmission rod 15, and then the transmission rod 15 drives 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. Among them, during machining, the stainless steel tube remains stationary.

[0279] Among them, during the processing, the non-electrical parameters satisfy:

[0280] 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 unilateral feed amount O1O2 is 2.248 mm.

[0281] Specifically, the bearing assembly includes an equal-height positioning block 12 and an auxiliary bearing block 13 installed on the machine tool to place the stainless steel tube on the equal-height positioning block 12 and the auxiliary bearing block 13 for clamping the stainless steel tube.

[0282] Among them, there are two equal-height positioning blocks 12, and the two equal-height positioning blocks 12 are respectively located on both sides of the position to be machined of the stainless steel tube, and the distance between the two equal-height positioning blocks 12 is 30 mm.

[0283] Among them, there are two auxiliary bearing blocks 13, and the two equal-height positioning blocks 12 are located between the two auxiliary bearing blocks 13 to support and position both ends of the stainless steel tube through the two auxiliary bearing blocks 13.

[0284] Among them, the upper end surfaces of the equal-height positioning block 12 and the auxiliary bearing block 13 are flush, and V-shaped grooves are provided on the upper end surfaces of the equal-height positioning block 12 and the auxiliary bearing block 13. The stainless steel tube is placed in the V-shaped groove for limiting the stainless steel tube.

[0285] Further, a clamping plate 14 is also provided on the equal-height positioning block 12. The clamping plate 14 covers the V-shaped groove and is clamped on the equal-height positioning block 12 to limit the stainless steel pipe, further improving the stability of the stainless steel pipe. Exemplarily, the angle of the V-shaped groove is 90° and the depth is 10 mm.

[0286] Among them, before placing the stainless steel pipe on the equal-height positioning block 12, it is first necessary to perform center alignment on the tool electrode 10, then insert the stainless steel pipe into the discharge end 101 of the tool electrode 10, and finally use the equal-height positioning block 12, the auxiliary bearing block 13 and the clamping plate 14 to clamp the stainless steel pipe, and align the stainless steel pipe through the equal-height positioning block 12 and the auxiliary bearing block 13.

[0287] Among them, 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 installed on the machine tool to drive the transmission rod 15 to swing through the machine tool, and then drive the tool electrode 10 to move through the transmission rod 15, so as to realize the eccentric movement of the discharge end 101 of the tool electrode 10 around the inner cavity central axis of the stainless steel pipe.

[0288] In this way, when the discharge end 101 of the tool electrode 10 makes one revolution of eccentric movement around the inner cavity central axis of the stainless steel pipe, the processing of the annular groove of the stainless steel pipe can be completed, achieving one-time processing in place, and the processing efficiency is significantly improved.

[0289] Those skilled in the art can understand that all or part of the processes of implementing the above method embodiments can be completed by instructing relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium. Among them, the computer-readable storage medium is a disk, an optical disc, a read-only memory or a random access memory, etc.

[0290] The present invention provides a new pipeline structure that can meet two functions of ventilation and sending electrical signals through the analysis of narrow spaces and corresponding functional requirements. Selecting stainless steel pipes with a variety of small diameters to form the pipeline body and the sleeve assembly can meet the minimum requirements of space and positioning. The selected thermocouple wire structure can meet the insulation requirements. Novel and reasonable pipeline welding, casing, and bending steps are set, as well as insulation detection for each step. On the basis of effectively forming the pipeline shape, the insulation performance of the parts is ensured synchronously, achieving the two functions of pipeline ventilation and sending electrical signals.

[0291] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A forming method for a multi-functional pipeline, characterized in that, It includes the following steps: Step 1: Insert one end of the gas path body provided with an axial through hole into the welding slot of the connection body and weld to obtain a gas path assembly; Step 2: Weld the other end of the gas path body to the nozzle, and conduct an airtightness test on the gas path assembly to inspect the airtightness of the weld between the connection body and the gas path body; Step 3: Fix the thermocouple on the gas path body; Step 4: Sleeve the first sleeve assembly outside the gas path body and the thermocouple; after sleeving, measure the resistance to ensure insulation between the thermocouple and other metal parts; weld the first sleeve assembly and the connection body; after welding, measure the resistance again to confirm whether there is insulation; Step 5: Sleeve the second sleeve assembly outside the gas path body and the thermocouple, downstream of the first sleeve assembly; after sleeving, measure the resistance to ensure insulation between the thermocouple and other metal parts; weld the second sleeve assembly and the gas path body; after welding, measure the resistance again to confirm whether there is insulation; Step 6: Bend and form the first sleeve assembly and the second sleeve assembly, and fix the first sleeve assembly and the second sleeve assembly to obtain a pipeline with gas-electric dual functions; Step 7: Connect the free end of the thermocouple to the electrical connector, measure the resistance to ensure insulation between the thermocouple and the remaining metal parts of the pipeline to obtain a multi-functional pipeline; The said Step 3 includes the following steps: Step 31: Spray an insulating coating on the end face of the connection body provided with the first groove; Step 32: Place the node of the thermocouple at the communication part of the first groove and the through hole on the connection body and set it in suspension, and sleeve the insulating part on the thermocouple; Step 33: Bond and fix the thermocouple in the first groove on the end face of the connection body and the second groove arranged on the side of the connection body; Step 34: Measure the insulation between the thermocouple and other metal parts.

2. The forming method of the multi-functional pipeline according to claim 1, characterized in that, The said Step 2 also includes conducting a passability inspection on the weld after the weld between the connection body to be connected and the gas path body is airtight to ensure that the through hole on the connection body can conduct air after welding.

3. The forming method of the multi-functional pipeline according to claim 1, characterized in that Before Step 1, it also includes forming the first sleeve assembly and the second sleeve assembly respectively.

4. The forming method of the multi-functional pipeline according to claim 3, characterized in that Forming the first sleeve assembly includes the following steps: Calculate the length of the first sleeve body, saw and cut the blank, and remove burrs at the flat end; Cut blank for multiple first limiting sleeves, saw and cut the blank, and remove burrs at the flat end; Machining to form the connecting sleeve; Sequentially sleeve multiple first limiting sleeves on the first sleeve body and weld; Sleeve the connecting sleeve on one end of the first sleeve body and weld.

5. The forming method of the multi-functional pipeline according to claim 3, characterized in that Forming the second sleeve assembly includes the following steps: Calculate the length of the second sleeve body, saw and cut the blank, and remove burrs at the flat end; Cut blank for the second limiting sleeve, cut the blank by wire cutting, and remove burrs; Sleeve the second limiting sleeve on the second sleeve body and weld.

6. The forming method of the multi-functional pipeline according to any one of claims 1-5, characterized in that Between Step 6 and Step 7, it also includes conducting an airtightness test on the multi-functional pipeline.

7. The forming method of the multi-functional pipeline according to claim 6, characterized in that, The said airtightness test is carried out by the method of pumping negative pressure.

8. The forming method of the multi-functional pipeline according to claim 1, characterized in that In the said Step 1, during welding, there is a margin between the gas path body and the connection body.

9. A multi-functional pipeline, characterized in that, Obtained by forming with the forming method described in any one of claims 1-8, the multi-functional pipeline includes a gas path assembly, a thermocouple, a first sleeve assembly and a second sleeve assembly; The gas path component is used to realize the ventilation of the pipeline; the thermocouple is fixed on the gas path component to realize the power-on signal of the pipeline.

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