CN115807880A - Gas-electric dual-function pipeline easy to break and fall off and processing method of weak part - Google Patents

Gas-electric dual-function pipeline easy to break and fall off and processing method of weak part Download PDF

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Publication number
CN115807880A
CN115807880A CN202211518172.9A CN202211518172A CN115807880A CN 115807880 A CN115807880 A CN 115807880A CN 202211518172 A CN202211518172 A CN 202211518172A CN 115807880 A CN115807880 A CN 115807880A
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stainless steel
pipeline
gas
tool electrode
main body
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马向宇
刘正然
周福见
荣田
高海涛
刘太盈
李伟超
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Beijing Xinghang Electromechanical Equipment Co Ltd
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Beijing Xinghang Electromechanical Equipment Co Ltd
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Abstract

The invention relates to an easy-to-break and-drop gas-electricity dual-function pipeline and a processing method of a weak part, belongs to the technical field of composite precision forming, and solves the problem that a pipeline is difficult to break and drop after corresponding functions are completed because no structural design for breaking and dropping a pipeline main body with the gas-electricity dual-function pipeline exists in the prior art. The gas-electric dual-function pipeline easy to break and fall off comprises a gas circuit component, a thermocouple, a filler neck and an electric connector; the gas circuit component is connected with the filler neck and is used for realizing the ventilation of the pipeline; the thermocouple is fixed on the gas circuit component, and the free end of the thermocouple is connected with the electric connector and used for realizing an electrifying signal of a pipeline; the gas circuit component comprises a connecting seat and a gas circuit main body; the gas circuit main body is provided with a weak part so as to facilitate the breaking and falling of the pipeline. The invention realizes the diversification of the functions of the pipelines, and one pipeline has the functions of ventilation and electrification.

Description

Gas-electric dual-function pipeline easy to break and fall off and processing method of weak part
Technical Field
The invention relates to the technical field of precision forming, in particular to a gas-electricity dual-function pipeline easy to break and fall and a processing method of a weak part.
Background
With the development of aerospace technology, miniaturization and structural weight reduction become more and more important, and cabin space becomes narrower and narrower correspondingly, so that a pipeline with dual functions of outputting electric signals and having ventilation capacity in a narrow space is required to be prepared.
The existing pipeline has single function, and the ventilation pipeline and the pipeline of the power-on signal are separately arranged, so that the use requirement in the narrow cabin body cannot be met. In addition, the pipeline main body with the gas-electricity dual-function pipeline is not broken and falls off in the prior art, so that the pipeline is difficult to break and fall off after corresponding functions are completed.
Disclosure of Invention
In view of the above analysis, the present invention is directed to provide an easily broken and detached gas-electric dual-function pipeline and a method for processing a weak portion, so as to solve the problem that the pipeline is difficult to break and detach after the corresponding function is completed because there is no structural design for breaking and detaching a pipeline main body having the gas-electric dual-function pipeline in the prior art.
The invention is mainly realized by the following technical scheme:
on one hand, the invention provides an easy-to-break and easy-to-fall gas-electric dual-function pipeline, which comprises a gas circuit component, a thermocouple, a nozzle and an electric connector; the gas circuit component is connected with the filler neck and is used for realizing the ventilation of the pipeline; the thermocouple is fixed on the gas circuit component, and the free end of the thermocouple is connected with the electric connector and used for realizing an electrifying signal of a pipeline; the gas circuit component comprises a connecting seat and a gas circuit main body; the gas circuit main body is provided with a weak part so as to facilitate the breaking and falling of the pipeline.
Optionally, the weak portion is an annular groove circumferentially arranged along the outer surface of the gas path main body.
Optionally, the depth of the groove is 0.3mm.
Optionally, the gas circuit assembly further comprises a sleeve assembly, wherein the sleeve assembly is sleeved outside the gas circuit assembly and the thermocouple and used for protecting the gas circuit assembly and the thermocouple; the sleeve assembly comprises a first sleeve component and a second sleeve component, and the second sleeve component is arranged at the downstream of the first sleeve component; the weakened portion is disposed between the first and second sleeve components.
Optionally, the wall thickness of the gas path main body is 0.2mm.
On the other hand, the invention also provides a processing method of the weak part on the gas-electric dual-function pipeline, which is used for processing the weak part on the gas-electric dual-function pipeline which is easy to break and fall off, and the processing method comprises the steps of utilizing the working states of a plurality of electric spark processing points which are arranged around the circumference of the stainless steel pipe of the tool electrode to realize the processing of the broken groove on the surface to be processed;
and changing the distance between the electric spark machining point and the surface to be machined to enable the same electric spark machining point to be in a working state or a non-working state.
Optionally, when the distance between the electric spark machining point and the surface to be machined is greater than a threshold value, the electric spark machining point is in a non-working state;
when the distance between the electric spark machining point and the surface to be machined is smaller than or equal to a threshold value, the electric spark machining point is in a working state;
processing the annular groove on the surface to be processed by the working state of a plurality of electric spark processing point positions arranged around the circumferential direction of the part to be processed;
the threshold value is the discharge distance between the electric spark machining point position meeting the machining requirement and the surface to be machined.
Optionally, the discharge end of the tool electrode is sleeved on the gas circuit main body, and during machining, the discharge end of the tool electrode eccentrically moves around the central axis of the inner cavity of the gas circuit main body.
Optionally, in the eccentric motion of the tool electrode, the one-sided feed O 1 O 2 Satisfies the following conditions:
O 1 O 2 ＝S 1 +(H 1 -H 2 )-S 2
wherein H 1 The wall thickness of the stainless steel tube; h 2 The wall thickness of the breaking groove; s 1 The distance between the discharge end of the tool electrode and the outer end face of the stainless steel tube is the distance before machining; s 2 Is a machining gap;
wherein, the distance S between the discharge end of the tool electrode and the outer end surface of the stainless steel tube 1 Satisfies the following conditions:
Figure BDA0003972587240000031
wherein S is 11 、S 12 、S 13 、S 14 The four points are uniformly distributed on the circular discharge end of the tool electrode for the actual allowance gap value between the four points selected on the circular discharge end of the tool electrode and the outer end face of the stainless steel pipe.
Optionally, the step 2 includes the following steps:
in addition, the invention also provides a weak part processing device which is used for processing the weak part.
Compared with the prior art, the invention can realize at least one of the following beneficial effects:
(1) The pipeline provided by the invention has the functions of ventilating and sending electric signals, and simultaneously has the design that the pipeline is broken and falls off after the corresponding functions are completed. Through the setting and the accurate processing of weak part, can be convenient for the rupture of pipeline after accomplishing corresponding function and drop.
(2) The pipeline is convenient to break and fall off after the corresponding functions are finished by arranging the weak part.
(3) According to the invention, through arranging the protection tool, the fracture at the weak part in the subsequent turnover and processing processes can be effectively prevented.
(4) The weak part is processed on a pipeline applied to a narrow space, and due to the small diameter, the thin wall thickness and the thinner wall thickness of the position of the breaking groove, the wall thickness of the position of the breaking groove is difficult to ensure by adopting the traditional turning processing mode. The invention provides an electric spark machining method, wherein a discharge end of a tool electrode comprises a plurality of electric spark machining points which are circumferentially arranged around a workpiece to be machined, the same electric spark machining point comprises a working state and a non-working state, when the tool electrode is used for electric spark machining of an annular groove of the workpiece to be machined, the distance between the electric spark machining points and the surface to be machined is continuously changed, the conversion between the working state and the non-working state is realized, and the working states of the plurality of electric spark machining points which are circumferentially arranged around the workpiece to be machined realize the machining of a weak part, so that the discharge end of the tool electrode is prevented from being in a continuous machining state, the loss of the tool electrode is reduced, the deformation of the working end surface of the tool electrode is reduced, and the machining precision of the weak part on a pipeline is improved.
(5) According to the invention, the first groove and the through hole along the axial direction of the connecting body are arranged on the end surface of the connecting body, and the node of the thermocouple is arranged at the communication position of the first groove and the through hole in a suspension manner, so that gas can enter the through hole and the gas circuit body through the gap between the node and the connecting body, and the ventilation function of the pipeline is realized. The electric conduction function of the pipeline is realized by arranging the thermocouple, and then the double functions of ventilation and electric conduction are realized.
(6) According to the invention, the first groove is formed in the end face of the connecting main body, the second groove is formed in the outer surface of the connecting main body, and the first groove and the second groove are communicated, so that the thermocouples can be orderly arranged in the first groove and the second groove, on one hand, the risk of short circuit caused by contact of the thermocouples with other metals is reduced, and on the other hand, the overall volume of the pipeline is reduced.
(7) According to the invention, the insulating coating is sprayed on the end face of the first groove, so that the connection main body and the thermocouple can be prevented from being conducted.
(8) According to the invention, the slot is arranged at the connecting position of the connecting main body and the gas circuit main body, so that the connecting main body and the gas circuit main body are connected more firmly.
(9) The insulating part is sleeved outside the thermocouple, so that the thermocouple can be insulated from other metals of the pipeline, the function of electric signal transmission of the thermocouple can be realized, and the transmitted electric signal can be clear and stable.
(10) The limiting sleeve is arranged outside the sleeve main body, so that the sleeve main body can be positioned and limited on the cabin body, and the internal space of the cabin body is saved. Through rationally setting up the interval between a plurality of spacing sleeve pipes, can make other circuit or part can pass through from the space between the adjacent spacing sleeve pipe, further save the inner space of the cabin body.
(11) According to the forming method of the pipeline with the ventilation and electrification dual functions, the first sleeve component and the second sleeve component are not bent and formed firstly and then sleeved into the gas path main body, but the first sleeve component and the second sleeve component are bent and formed after being sleeved into the gas path main body, so that the damage to an insulating part outside a thermocouple is reduced in the process of sleeving the first sleeve component and the second sleeve component, the insulation of the thermocouple and the rest metal parts of the pipeline can be effectively guaranteed, and the qualification rate of the pipeline with the ventilation and electrification dual functions is improved.
(12) In the method for forming the pipeline with the double functions of ventilation and electrification, the airtightness and/or insulation test is carried out after each step of operation, the problem can be found in time and the pipeline can be processed in time, and the forming efficiency and the forming qualified rate are improved.
(13) Aiming at the problem that a thermocouple is bonded in the second groove and a positive pressure airtight test is difficult to carry out, the vacuum bag is adopted for carrying out negative pressure pumping test, so that the airtight test can be ensured to be finished, and the thermocouple can be protected from being damaged.
(14) According to the invention, the flow guide piece is arranged, so that on one hand, the air flow is limited from entering from the through hole on the connecting main body 1-1, and the ventilation effect is improved; on the other hand, the thermocouple at the tip can be protected.
In the invention, the technical schemes can be combined with each other to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
FIG. 1 is a schematic structural diagram of a pipeline with dual functions of ventilation and energization according to the present invention;
FIG. 2 is a schematic view of the gas circuit assembly;
FIG. 3 is a schematic view of a first sleeve assembly;
FIG. 4 is a schematic view of a second sleeve assembly;
FIG. 5 is a schematic structural view of a gas path body with a weakened portion (annular groove);
FIG. 6 is a schematic view of a protection tool;
FIG. 7 is a schematic view of the structure of the flow guide;
FIG. 8 is a schematic view of a tool electrode configuration of the present invention;
FIG. 9 isbase:Sub>A schematic cross-sectional view taken at A-A of FIG. 8;
FIG. 10 is a schematic cross-sectional view taken at B-B of FIG. 8;
FIG. 11 is a schematic structural view of the discharge end center line of the tool electrode of the present invention coinciding with the central axis of the inner cavity of the stainless steel tube;
FIG. 12 is a schematic view showing the structure of the tool electrode according to the present invention when the center line of the tool electrode is deviated from the central axis of the inner cavity of the stainless steel pipe;
FIG. 13 is a schematic cross-sectional view of the discharge end of the tool electrode of the present invention fitted over a stainless steel tube;
FIG. 14 is a view showing the center O of the discharge end of the tool electrode of the present invention moving eccentrically around the central axis of the inner cavity of the stainless steel tube 2 The motion track schematic diagram of (a);
FIG. 15 is a schematic view showing that when the discharge end of the tool electrode of the present invention eccentrically moves around the central axis of the inner cavity of the stainless steel tube, any point O on the discharge end 3 The motion track schematic diagram of (a);
FIG. 16 is a schematic view of the structure of the load bearing assembly of the present invention engaged with a stainless steel tube;
FIG. 17 is a schematic view of the structure of the stainless steel pipe annular groove of the present invention;
FIG. 18 is a schematic view of the structure of the combination of the equal-height positioning blocks, the clamping plates and the stainless steel tube in the present invention;
FIG. 19 is a schematic view of the structure of the auxiliary bearing block and the stainless steel tube.
Reference numerals:
1. a gas circuit component; 1-1, connecting the main body; 1-2, a gas path main body; 1-3, through holes; 1-4, a first groove; 1-5, a second groove; 1-6, a first open slot; 1-7, convex; 2. a first cannula assembly; 2-1, a first sleeve body; 2-2, a first limit sleeve; 2-3, connecting a sleeve; 3. a second sleeve assembly; 3-1, second sleeve body 3-1;3-2, a second limiting sleeve; 4. a thermocouple; 5. a filler neck; 6. an electrical connector; 7. a weakened portion; 8. protecting the tool; 8-1, protecting the main body; 8-2, a pressing piece; 8-3, an anti-loosening element; 8-4, through grooves; 9. a flow guide member; 9-1, a flow guide main body; 9-2, a flow guide cap; 9-3, flow guide holes; 10. a tool electrode; 11. a work table surface; 12. equal-height positioning blocks; 13. an auxiliary bearing block; 14. a clamping plate; 15. a transmission rod; 101. a discharge end; 102. a working end; 103. a non-working end; 104. a conductive terminal; 16. a machine direction; 17. a direction of eccentric motion;
H 1 the wall thickness of the stainless steel tube; h 2 The wall thickness of the annular groove; alpha, oblique angle; s 11 、S 12 、S 13 、S 14 Actual allowance gap values between four points selected from the circular working end of the tool electrode and the outer end face of the stainless steel pipe; s 2 Machining a gap; o is 1 A discharge end center point; o is 2 The center point of the inner cavity of the stainless steel pipe; o is 3 And a point selected on the discharge end.
Detailed Description
The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and which together with the embodiments of the invention serve to explain the principles of the invention and not to limit its scope.
Example one
In an embodiment of the present invention, a pipeline with dual functions of ventilation and power-on is disclosed, as shown in fig. 1, including an air path assembly 1, a first sleeve assembly 2, a second sleeve assembly 3, a thermocouple 4, a filler neck 5 and an electrical connector 6. The air path component 1 is connected with the filler neck 5 and used for realizing the ventilation of the pipeline. The thermocouple 4 is fixed on the gas circuit component 1, and the free end of the thermocouple is connected with the electric connector 6 and used for realizing the electrifying signal of the pipeline. The first sleeve component 2 and the second sleeve component 3 are sleeved on the outer sides of the gas circuit component 1 and the thermocouple and used for protecting the gas circuit component 1 and the thermocouple 4.
As shown in fig. 2, the air path assembly 1 includes a connection seat and an air path body 1-2. The connecting seat comprises a connecting body 1-1, an axial through hole 1-3 is formed in the connecting body 1-1, one end of the connecting body 1-1 is connected with the gas path body 1-2, a first groove 1-4 for placing a thermocouple 4 is formed in the end face of the other end of the connecting body 1-1, the first groove 1-4 is in a straight shape, and the length of the first groove is equal to the outer diameter of the connecting body 1-1. The through hole 1-3 communicates with the first groove 1-4.
The first sleeve component 2 and the second sleeve component 3 are sleeved on the outer sides of the gas path main bodies 1-2 and the thermocouples 4 and used for protecting the gas path main bodies 1-2 and the thermocouples 4, and the second sleeve component 3 is located on the downstream of the first sleeve component 2.
In a preferred embodiment, the end face of the connecting body 1-1 provided with the first recess 1-4 is provided with an insulating coating, thereby preventing the connecting body 1-1 from conducting with the thermocouple 4.
The connecting body 1-1 is provided on its side with a second groove 1-5 parallel to the axial direction of the connecting body 1-1 and extending from one end of the connecting body 1-1 to the other. The number of the second grooves 1-5 is two, and the second grooves are communicated with the first grooves. The two second grooves are symmetrically arranged relative to the through hole.
In a possible embodiment, the connecting seat further comprises a protrusion 1-7, the protrusion is arranged at one end of the connecting body 1-1 connected with the air path body 1-2, and the protrusion 1-7 is circumferentially arranged along the outer surface of the connecting body 1-1. The connecting body 1-1 is provided with external threads for connection with other components, such as a flow guide. The protrusion plays a limiting role and prevents excessive screwing. The bulges 1-7 are provided with radial open slots.
Specifically, the open grooves include first open grooves 1-6 and second open grooves. The number of the first opening grooves 1 to 6 and the second opening grooves is two. The two first open grooves 1-6 and the two second open grooves are alternately and uniformly distributed along the circumferential direction. Wherein the two first open grooves 1-6 are respectively communicated with the two second grooves so as to facilitate the thermocouple 4 to pass through. The two second open grooves are used for integrally installing the pipeline. Illustratively, the projections 1-7 are of a flange configuration.
Further, a welding slot (not shown in the figure) is arranged at the joint of the connecting body 1-1 and the gas path body 1-2. Through the arrangement, the welding of the connecting main body 1-1 and the gas circuit main body 1-2 can be more reliable.
The other end of the gas path main body 1-2 is connected with a filler neck 5. Specifically, the gas path main body 1-2 is a stainless steel tube with a diameter of 2mm and a wall thickness of 0.5mm.
As shown in fig. 3, the first bushing assembly 2 includes a first bushing body 2-1, a first stop bushing 2-2, and a coupling bushing 2-3. The first sleeve main body 2-1 is in a hollow tubular shape, is sleeved on the outer side of the gas circuit main body 1-2 and is used for protecting the gas circuit main body 1-2 and the thermocouple 4. The first limiting sleeve 2-2 is in a hollow tubular shape, is sleeved outside the first sleeve main body 2-1 and is used for positioning and limiting the first sleeve main body 2-1 on the cabin body, so that the gas-electricity dual-function pipeline is positioned and limited on the cabin body. Specifically, the bottom of the limiting part of the first limiting sleeve 2-2 is coated and adhered to the cabin wall. The connecting sleeve 2-3 is sleeved outside the first sleeve main body 2-1 and at one end of the first sleeve main body 2-1 and is connected with the connecting main body 1-1.
In a preferred embodiment, the number of the first limiting sleeves 2-2 is multiple, the multiple first limiting sleeves are sequentially arranged along the length direction of the first sleeve main body 2-1, and a gap is formed between every two adjacent first limiting sleeves and used for installing and limiting other components, so that the purposes of reasonably utilizing space and orderly arranging the components are achieved. The size of the gap can be determined according to the components to be mounted and limited.
In one possible embodiment, the first position limiting sleeve 2-2 and the connecting sleeve 2-3 are fixedly connected to the first sleeve body 2-1. Such as welding.
In addition, the connecting sleeve 2-3 is fixedly connected with the connecting body 1-1, so that the connection of the first sleeve component 2 and the air path component 1 is realized.
In one specific embodiment, the first sleeve body 2-1 is a stainless steel tube with a diameter of 5mm and a wall thickness of 0.8mm.
The second sleeve assembly 3 is arranged downstream of the first sleeve assembly 2 for segment protection. As shown in fig. 4, which includes a second sleeve body 3-1 and a second stop sleeve 3-2. The second sleeve main body 3-1 is in a hollow tubular shape, is arranged on the outer side of the gas circuit main body 1-2 and is used for protecting the gas circuit main body 1-2 and the thermocouple 4. The second limiting sleeve 3-2 is in a hollow tubular shape, is sleeved outside the second sleeve main body 3-1, and is used for limiting the second sleeve main body 3-1 on the cabin body.
Specifically, the second sleeve body 3-1 is a stainless steel tube with a diameter of 4mm and a wall thickness of 0.3mm.
The second limiting sleeve 3-2 is a stainless steel pipe with the diameter of 5mm and the wall thickness of 0.5mm.
In a preferred embodiment, as shown in fig. 5, a weak portion 7 is provided on the gas path main body 1-2 between the first sleeve component 2 and the second sleeve component 3 to facilitate breaking and falling off of the pipeline after the corresponding function is completed. Specifically, the weak part 7 is an annular groove arranged along the circumferential direction of the outer surface of the gas path main body 1-2, that is, the wall thickness of the gas path main body 1-2 where the weak part is arranged is smaller than that of the gas path main body 1-2 where the weak part is not arranged. For example, the wall thickness of the gas path main body 1-2 without the weak portion is 0.5mm, while the wall thickness of the gas path main body 1-2 with the weak portion is 0.2mm, and the depth of the annular groove is 0.3mm.
The thermocouple 4 is used for transmitting electric signals, a node is arranged on the thermocouple 4 and used for generating and sending the electric signals, and an insulating part is sleeved outside the thermocouple 4. The thermocouple 4 is a wire, preferably a platinum rhodium wire. The node is arranged at the communication position of the first groove and the through hole and is suspended in the air. The advantages of the above arrangement are: make gas can get into through-hole and gas circuit main part through the gap of node with the connecting seat, realize the function of ventilating.
In one possible way, the thermocouples 4 located on both sides of the node are respectively fixed in the two second grooves, and the free ends of the thermocouples 4 are connected with the electric connector 6. Illustratively, the thermocouple 4 is fixed in the second recess by means of bonding. The adhesive can be J303 glue.
Specifically, the insulating portion is made of alumina ceramic. The advantages of using alumina ceramics are: the application environment of the pipeline is a high-temperature environment, and the alumina has good high-temperature resistance, cannot age due to high temperature and can play a good insulation effect.
In a preferred embodiment, the insulating portion includes a plurality of insulating units, and the plurality of insulating units are arranged in order in the longitudinal direction of the thermocouple 4. And (4) setting in sections. This embodiment sets up the subsection setting of insulating part through setting up insulating part into including a plurality of insulating units, has realized the insulating part, is convenient for follow-up to pipeline bending to difficult damage insulating part among the bending process. Illustratively, the insulating unit is a hollow cylinder having a length of 5mm, an inner diameter of 0.5mm and an outer diameter of 1mm. The insulating unit is made of alumina ceramics.
Because the foremost end of gas circuit subassembly is in high temperature environment, therefore the connecting seat of the foremost end of gas circuit subassembly chooses for use high temperature resistant alloy material, the gas circuit main part adopts stainless steel material, the circuit part adopts thermocouple (platinum rhodium silk) transmission signal of telecommunication, terminal power consumption connector sends the signal of telecommunication, consequently require circuit part and gas circuit part insulating in pipeline design and manufacturing process, the part that also requires the pipeline simultaneously possesses in narrow and small cabin body can give spacing, the location auxiliary function can just satisfy final use demand.
In addition, the pipeline with the dual functions of ventilation and electrification in the embodiment further comprises a flow guide piece 9. The flow guide member 9 is provided at an end of the connecting body 1-1 on which the first groove 1-4 is provided, for guiding the air flow into the through hole of the connecting body 1-1. As shown in fig. 7, the flow guide member 9 includes a flow guide body 9-1 and a flow guide cap 9-2 provided at one end of the flow guide body 9-1.
The flow guiding main body 9-1 is cylindrical, and is provided with a flow guiding hole 9-3 which is communicated with the flow guiding main body 9-1 and the flow guiding cap 9-2, and the flow guiding hole is axially arranged and is a through hole. The flow guide hole 9-3 is internally provided with internal threads to realize threaded connection with the connecting body 1-1. After the flow guide piece is arranged on the connecting body 1-1, the end face of the flow guide cap 9-2 is higher than the end face of the connecting body 1-1 provided with the first groove, so that a flow guide channel is formed, and gas firstly enters the flow guide channel and then is guided into the through hole of the connecting body 1-1.
Example two
The invention further discloses a method for processing the connecting seat of the gas-electric dual-function pipeline, which is used for processing the connecting seat of the first embodiment and comprises the following steps:
step 1: the appearance of the connecting seat is turned by the lathe, namely the connecting body, the bulge at one end of the connecting body and the external thread on the connecting body.
Step 2: and processing a through hole on the connecting body.
The through hole in the connecting body is machined by means of electric discharge machining with the other end of the connecting body (i.e., the end face of the end not including the projection) as a reference.
And step 3: the processing connecting body both sides the second recess, the bellied open slot on and the connecting body on the first recess, specifically include following step:
adopting the same reference as the step 2, namely still taking the other end of the connecting main body (namely the end surface of one end not comprising the bulge) as the reference, firstly, simultaneously processing second grooves at two sides of the connecting main body and two first open grooves on the bulge in an electric spark machining mode; secondly, processing two second open grooves on the bulges in an electric spark processing mode; and finally, processing a first groove on the connecting body in an electric spark machining mode.
The dimensional tolerance of the first groove and the second groove needs to be strictly controlled during processing, so that the thermocouple sleeved with the insulating part (alumina ceramic) can not protrude out of the groove after being arranged in the groove.
EXAMPLE III
The invention further discloses a method for forming the gas-electric dual-function pipeline, which is used for forming the pipeline with dual functions of ventilation and electrification in the first embodiment.
Before the gas-electric dual-function pipeline is formed, various components such as a connecting seat, a first sleeve component, a second sleeve component and the like are firstly machined and formed. After each part is machined and formed, the whole gas-electric dual-function pipeline is not integrally formed, but each part is assembled firstly, so that the parts can be smoothly assembled, and then the whole gas-electric dual-function pipeline is integrally formed.
Processing of the coupling socket referring to example two, the formation of the first and second ferrule assemblies 2 and 3, respectively, is described below.
The first sleeve assembly 2 is formed by the following method:
step 1: calculating the length of the first sleeve main body 2-1, sawing and blanking, and removing burrs at the flat end;
step 2: blanking a plurality of first limiting sleeves 2-2, sawing and blanking, and removing burrs at the flat end;
and 3, step 3: machining and forming the connecting sleeve 2-3;
and 4, step 4: scribing on the first sleeve main body, welding a plurality of first limiting sleeves 2-2 and the first sleeve main body 2-1 into a whole in a cold welding mode, wherein only four points are welded at the front, the back, the upper and the lower parts of each first limiting sleeve during welding, so that the welding is firm, the welding current is controlled, and welding beading is prevented from occurring in the first sleeve main body 2-1 during welding;
and 5: sleeving a connecting sleeve at one end of a first sleeve main body and welding; the welding mode is the same as that of the step 4.
The second sleeve member 3 is formed by the following method:
step 1: calculating the length of the second sleeve main body 3-1, sawing and blanking, and removing burrs at the flat end;
step 2: blanking a second limiting sleeve 3-2, performing linear cutting blanking, and removing burrs at the flat end;
and step 3: sleeving a second limiting sleeve 3-2 on the second sleeve main body 3-1, and welding; note that when welding, the pipe wall is too thin, so that the phenomenon of welding the pipe wall through easily occurs, and a copper rod needs to be added inside.
The assembly method of the gas-electric dual-function pipeline comprises the following steps:
step 1: and connecting the gas path main body with the connecting seat to obtain a gas path assembly.
Step 2: the insulating part is sleeved outside the thermocouple, and the thermocouple is fixed on the connecting seat. The method comprises the following specific steps:
step 21: placing a node of the thermocouple at a communication position between the first groove and the through hole on the connecting main body of the connecting seat, and suspending the node;
step 22: sequentially sleeving the plurality of insulation units on the thermocouple, thereby sleeving the insulation part on the thermocouple;
step 23: the thermocouple is secured in a second recess in the connecting body.
And step 3: locate the outside of gas circuit main part and thermocouple with thimble assembly cover, specifically as follows:
step 31: sleeving the first sleeve component into the gas path main body and the outer part of the thermocouple;
step 32: and sleeving the second sleeve component on the outer parts of the gas path main body and the thermocouple and the downstream of the first sleeve component.
Further, step 31 further comprises: in the process of sleeving the first sleeve component, if the insulation units are damaged, the damaged insulation units are removed, and the insulation units are sleeved again after being arranged smoothly.
And 4, step 4: the gas path main body is connected with the filler neck.
And 5: and connecting the free end of the thermocouple with the electric connector to obtain the gas-electric dual-function pipeline.
The forming method of the gas-electric dual-function pipeline comprises the following steps:
step 1: one end of the gas path main body 1-2 is inserted into the welding slot of the connecting main body 1-1, and the two are welded by argon arc welding to form a whole, so that the gas path component 1 is obtained. During welding, 10mm of allowance is left between the gas circuit main body 1-2 and the connecting main body 1-1, and the purpose is as follows: minimum duct size for ventilation and forming functions.
And 2, step: and welding the other end of the gas path main body 1-2 with the filler neck 5, and performing a positive pressure airtight test on the gas path component 1 to test the airtightness of a welding seam between the connecting main body 1-1 and the gas path main body 1-2. And (4) after the airtightness is qualified, checking the trafficability of the welding seam by using a 0.5mm iron wire so as to ensure that the through hole in the connecting main body can be ventilated after welding. The through hole on the connecting body can be ventilated after welding, and the filler neck 5 and the reserved allowance are removed, so that the subsequent smooth sleeve can be ensured. And if the airtightness is not qualified, searching the reason until the airtightness is qualified.
And step 3: and fixing the thermocouple.
And spraying an insulating coating on the end face of the connecting main body 1-1 provided with the first groove 1-4, placing a node of the thermocouple 4 at the communication position of the first groove 1-4 and the through hole 1-3 on the connecting main body 1-1 in a suspended manner, and sleeving the insulating part on the thermocouple 4. Then, the thermocouple 4 is adhesively fixed in the first recess 1-4 and the second recess 1-5 by using a J303 adhesive. After the bonding is completed, the insulation between the thermocouple 4 and other metal parts of the pipeline is measured.
And 4, step 4: after the thermocouple 4 is confirmed to be insulated from other metal of the pipeline, the first sleeve component 2 is sleeved outside the gas circuit main bodies 1-2 and the thermocouple 4. The method comprises the following specific steps:
the thermocouple 4 is straightened by double operation, the first sleeve pipe component 2 is slowly sleeved, if a certain insulating unit outside the thermocouple 4 is damaged in the sleeving process, the first sleeve pipe component 2 can be slowly faded down, the damaged insulating unit is removed, then the following insulating unit is tidied smoothly and sleeved again, the thermocouple 4 cannot be bent or damaged in the whole sleeving process, the resistance is measured after the completion of the sleeving, and the insulativity of the thermocouple 4 and other metal parts of a pipeline is ensured. If not, the first sleeve assembly 2 is removed and re-inserted. And after the insulation is confirmed, welding the first sleeve component 2 and the connecting body 1-1, measuring the resistance again after the welding is finished, and confirming whether the insulation is available. If not, the reason is searched until insulated.
And 5: the second sleeve component 3 is sleeved outside the gas path main bodies 1-2 and the thermocouple 4, and the second sleeve component is sleeved outside the gas path main bodies
Downstream of the sleeve assembly 2. The same considerations apply when setting in as when setting in the first sleeve assembly 2. After the sleeve is sleeved, the resistance is measured to ensure that the thermocouple 4 is insulated from the rest metal parts of the pipeline. And after the insulation is confirmed, welding the second sleeve component 3 and the connecting body 1-1, measuring the resistance again after the welding is finished, and confirming whether the insulation is available. If not, the reason is searched until insulated.
Step 6: according to design requirements, the first sleeve component 2 and the second sleeve component 3 are bent and formed, the bending needs to be slow and careful, and after the bending is finished, the resistance is measured, so that the thermocouple 4 is ensured to be insulated from the rest metal parts of the pipeline. And (3) bonding and fixing the first sleeve component 2 and the second sleeve component 3 by using J303 glue to obtain the pipeline with the gas-electricity dual functions.
And 7: and carrying out an airtight test on the pipeline with the pneumatic and electric functions.
Since the thermocouple 4 is bonded in the second groove 1-5 of the connection body 1-1 at this time, it is difficult to perform the positive pressure airtight test. In a preferred embodiment, all parts of the filler neck 5 before the weld seam can be inserted into a gas-tight test piece, the mouth is sealed by sealing cement, and the gas-tight test is carried out by means of negative pressure suction. In particular, the airtight test piece may be a vacuum bag.
And step 8: the free end of the thermocouple 4 is connected with the electric connector 6, and the resistance is measured, so that the thermocouple 4 is ensured to be insulated from the rest metal parts of the pipeline.
Example four
According to another embodiment of the invention, a method for processing an annular groove is provided, which is used for processing a weak part of the gas-electric dual-function pipeline obtained in the first embodiment.
The embodiment adopts an electric spark machining mode to solve the problem that the existing method is difficult to realize high-precision machining of the annular groove on the ultra-slender and thin-walled tubular member.
Specifically, the method comprises the step of processing the annular groove on the surface to be processed by utilizing the working state of a plurality of electric spark processing point positions of the tool electrode, which are circumferentially arranged around the part to be processed.
The same electric spark machining point comprises a working state and a non-working state, and when the distance between the electric spark machining point and the surface to be machined is greater than a threshold value, the electric spark machining point is in the non-working state;
when the distance between the electric spark machining point and the surface to be machined is smaller than or equal to a threshold value, the electric spark machining point is in a working state;
the threshold value is the discharge distance between the electric spark machining point position meeting the machining requirement and the surface to be machined.
Wherein, discharge end 101 includes a plurality of electric spark processing point locations that wait that machined part circumference set up that encircle, and a plurality of electric spark processing point locations that wait that machined part circumference sets up of encircleing can treat continuous uninterrupted distribution of machined part circumference for encircleing, also can treat that machined part circumference is discontinuous distribution for encircleing, can realize treating that the continuous processing of annular groove takes shape on the machined surface can.
In a possible embodiment, one end of the tool electrode 10 is annular, that is, a plurality of electrical discharge machining points circumferentially arranged around the workpiece to be machined form a continuous annular shape, as shown in fig. 8-13, the inner circle end of the annular ring is matched with the annular groove in shape, that is, the inner circle end is convex, the annular groove is concave, and the cross-sectional size of the convex shape is the same as the cross-sectional shape of the concave groove; 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 disposed on the machine tool, and is used to introduce a current, and transmit the current to an inner circle end, which is a discharge end 101 at this time, so as to implement the machining of the annular groove on the surface to be machined in a working state of a plurality of electrical discharge machining points surrounding the circumferential direction of the workpiece to be machined through the discharge end 101.
In one possible embodiment, the discharge end 101 is a rigid structure, and the discharge end 101 is sleeved on the outer end surface of the stainless steel tube gas path main body 1-2. Specifically, the gas path main body 1-2 is a stainless steel tube. When in processing, the stainless steel pipe is electrically connected with the other output end of the power supply device, and the tool electrode 10 eccentrically moves around the central axis of the inner cavity of the stainless steel pipe; wherein, in the process of the eccentric motion of the tool electrode 10, the distance between the inner circle end surface of the discharge end 101 and the end surface to be processed of the stainless steel tube is continuously changed; when the distance between the electric spark machining point and the surface to be machined is greater than the threshold value, the electric spark machining point is in a non-working state, and at the moment, the electric spark machining point is a non-working end 103; when the distance between the electrical discharge machining point and the surface to be machined is smaller than or equal to the threshold value, the electrical discharge machining point is in a working state, and at the moment, the electrical discharge machining point is a working end 102, so that the working state and the non-working state are converted at the same electrical discharge machining point, the working states of all the electrical discharge machining points jointly realize the machining of the annular groove on the surface to be machined, namely, the position of the working end 102 is changed continuously in the inner circular end surface of the discharge end 101, the circular discharge end of the tool electrode eccentrically moves for a circle around the central axis of the inner cavity of the stainless steel tube, and all the working ends form continuous annular discharge ends around the circumferential direction of the workpiece to be machined, so that the discharge end 101 of the tool electrode 10 is prevented from being in a continuous machining state, and the loss of the tool electrode 10 is further reduced.
The annular discharge end 101 of the tool electrode 10 comprises a plurality of working ends 102 which are distributed annularly, and when the discharge end eccentrically moves around the central axis of the inner cavity of the stainless steel pipe to be machined, the working ends 102 are in a non-synchronous and non-continuous machining state; and the processing tracks of the plurality of working ends jointly form an annular groove of the workpiece to be processed.
Specifically, after the tool electrode 10 eccentrically moves for one circle, all end surfaces of the discharge end 101 participate in the electric spark machining, that is, all the working ends 102 form the complete discharge end 101, and the machining tracks of all the working ends 102 form the annular groove of the stainless steel pipe; along the deflection motion direction of the tool electrode 10, the working ends 102 have a circular motion phenomenon on the discharge end 101, that is, the positions of the working ends 102 are different at different times, so that all the working ends 102 are processed alternately and orderly, the processing direction 16 is the circumferential direction around the outer end surface of the stainless steel tube, and the surface where the circumferential direction is located is perpendicular to the central axis of the inner cavity of the stainless steel tube.
The criterion for determining whether the discharge end 101 is the working end 102 is whether the distance between the discharge end 101 and the surface to be processed of the stainless steel tube is greater than 50 μm, if not, the discharge end 101 is the working end 102, and if so, the discharge end 101 is the non-working end 103.
Specifically, the tool electrode 10 is mounted on a machine tool, and during machining, the machine tool drives the tool electrode 10 to perform eccentric motion, so that the discharge end 101 of the tool electrode surrounds the end surface of the stainless steel tube to perform electric discharge machining, the machining direction 16 is a circumferential direction around the outer end surface of the stainless steel tube, and a central line of the circumferential direction coincides with a central axis of an inner cavity of the stainless steel tube.
Specifically, before the tool electrode 10 performs the eccentric motion, the center of the inner circular end of the discharge end 101 of the tool electrode 10 needs to be adjusted 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 surface of the stainless steel tube, i.e. the diameter of the inner circular end of the discharge end 101 is larger than the outer diameter of the stainless steel tube, illustratively, the diameter of the inner circular end is 10-20 mm, which is 5-10 times the outer diameter of the stainless steel tube. Thereby, during the electric discharge machining, the determination of the one-side feed O is facilitated 1 O 2 The value of (c).
Wherein the one-side feed amount O 1 O 2 Satisfies the following conditions:
O 1 O 2 ＝S 1 +(H 1 -H 2 )-S 2
wherein, O 1 Represents the center point of the discharge end 101 of the tool electrode 10;
O 2 representing the center point of the inner cavity of the stainless steel pipe;
H 1 the wall thickness of the stainless steel tube;
H 2 the wall thickness of the annular groove;
S 1 a margin gap is formed between the discharge end 101 and the outer end face of the stainless steel pipe;
S 2 the machining gap is the closest distance between the working end 102 and the end face of the stainless steel tube 01 when the tool electrode 10 is eccentrically moved.
Wherein S is 1 Satisfies the following conditions:
Figure BDA0003972587240000181
wherein S is 11 、S 12 、S 13 、S 14 The four points are evenly distributed on the discharge end 101 for the actual margin gap value between the four points selected on the discharge end 101 of the tool electrode 10 and the outer end surface of the stainless steel pipe.
Exemplary, S 11 、S 12 、S 13 、S 14 Respectively 2.055mm, 2.060mm, 2.065mm, 2.050mm, in which case S 1 ＝2.058mm。
Wherein the machining gap S 2 The value is 10-50 μm to meet the requirement of electric spark machining.
Exemplary, S 2 ＝10μm；H 1 ＝0.5mm，H 2 ＝0.3mm，S 1 =2.058mm, in which case O 1 O 2 ＝2.248mm。
Wherein the measurement S can be performed by means of an automatic centering module on the machine tool 11 、S 12 、S 13 、S 14 If the four values are equal, the center of the inner circular 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.
Wherein, after the center of the discharge end 101 of the tool electrode 10 is adjusted by the machine tool 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 of (1) are, the more precise the value of S1 and thus the one-sided feed O 1 O 2 The more precise, the more precise the machining gap and thus the machining depth of the working end 102 during the eccentric movement of the tool electrode 10, the more precise the dimensional accuracy of the machined annular groove.
Specifically, after the center of the discharge end 101 of the tool electrode 10 is adjusted to coincide with the central axis of the inner cavity of the stainless steel tube, the tool electrode 10 is driven by a machine tool to perform eccentric motion, and the detailed process is as follows.
At the center point O of the discharge end 101 of the tool electrode 10 1 And the center point O of the inner cavity of the stainless steel pipe 2 Is set toThe following are as follows:
moving the tool electrode 10 so that O 1 Away from O 2 Distance of travel and one-side feed O 1 O 2 Same, at this time, O 1 And O 2 A distance of O between 1 O 2 ；
With O 2 Centered on O 1 O 2 To a radius, adding O 1 Around O 2 Rotation at this time, O 1 The locus of the movement is a circle, as shown in fig. 14, the center of which is O 2 Radius is O 1 O 2 ；
Wherein in the movement of O 1 When the shortest distance between the end face of the discharge end 101 and the surface of the stainless steel tube reaches 10 μm, the power supply is started to supply pulse voltage to the tool electrode 10 and the stainless steel tube, and metal on the surface of the stainless steel tube is etched at a processing speed of 0.04g/min until O is reached 1 And O 2 Has a distance of O 1 O2, then O 1 Around O 2 Performing a circular motion.
To further illustrate the motion trajectory of the tool electrode 10, an arbitrary point O on the discharge end 101 is selected 3 With O 3 Is illustrated as follows:
moving the tool electrode 10 so that O 3 Towards O 2 Moving by a distance O 1 O 2 ；
At O 1 Around O 2 During rotation, at this time, O is shown in FIG. 15 3 The trajectory of (a) is: with O 3 Is taken as the center of a circle and takes O as the center 1 O 2 A circle with a radius;
wherein at O 3 In the moving process, when the shortest distance between the end surface of the discharge end 101 and the surface of the stainless steel tube reaches 10 micrometers, a power supply device is started to transmit pulse voltage to the tool electrode 10 and the stainless steel tube, and metal on the surface of the stainless steel tube is etched at the processing speed of 0.04g/min until O 3 A moving distance of O 1 O 2 Then, O 3 Then, the circular motion is performed by taking the initial position as the center of a circle.
Therefore, in the process of the eccentric motion of the tool electrode 10, the distance between the inner circle end surface of the discharge end 101 and the outer surface of the stainless steel tube is changed continuously, the distance between each part of the inner circle end surface of the discharge end 101 and the outer end surface of the stainless steel tube is changed from close to far, and further, the discharge end 101 is changed from the working state to the non-working state, namely, the dynamic change between the working end 102 and the non-working end 103 is realized.
An allowance gap is formed between the discharge end 101 and the outer end face of the stainless steel tube 01, so that a non-machining gap between the non-working end 103 of the discharge end 101 and the end face of the stainless steel tube is large enough, and the pulse voltage released from the non-working end 103 cannot erode metal on the surface of the stainless steel tube. Thus, dynamic switching between the working end 102 and the non-working end 103 is achieved when the tool electrode 10 is moved eccentrically.
The conductive end 104 of the tool electrode 10 is electrically connected to one output end of a power supply device disposed on the machine tool, and the stainless steel tube is electrically connected to the other output end of the power supply device, wherein the power supply device includes a pulse power supply, and two output ends of the pulse power supply are respectively connected to the positive electrode and the negative electrode of the pulse power supply for outputting pulse voltage.
During processing, the stainless steel tube and the discharge end 101 of the tool electrode 10 are immersed in a liquid medium with a certain degree of insulation, for example, kerosene, mineral oil or deionized water; when pulse voltage is applied to the discharge end 101 and the stainless steel tube, the liquid medium at the closest point between the stainless steel tube and the discharge end 101 under the current condition is broken down to form a discharge channel, and the sectional area of the channel is very small, so that the discharge time is very short, and the energy is highly concentrated (10-10) 6 W/mm), the instantaneous high temperature generated in the discharge area is enough to melt and even evaporate the metal on the surface of the stainless steel pipe, so that a small pit is formed; after the first pulse discharge is finished, and a short interval time is passed, the second pulse is punctured and discharged at the closest point between the two electrodes, so that the high-frequency cycle is repeated, the tool electrode 10 is continuously fed to the stainless steel pipe, and the shape of the tool electrode is finally copied on the stainless steel pipe to form the required machining surface; during the machining process, a small part of the total energy is also released to the tool electrode 10, resulting in the tool electrode 10 loss, however, the discharge end 101 of the tool electrode 10 eccentrically moves around the central axis of the inner cavity of the stainless steel tube, and the working end 102 at the discharge end 101 continuously changes positions, so that the loss of the tool electrode 10 is reduced by avoiding continuous processing of the working end 102, and then the working end 102 of the discharge end 101 keeps a relatively complete shape at each time of processing, thereby improving the processing precision.
Illustratively, during the machining, the electrical parameters satisfy:
the pulse width is 30-60 mus, the pulse interval is 20-30 mus, the average processing current is 0.8-2A, and the average processing voltage is 30-60V.
Specifically, during machining, the tool electrode 10 is controlled by the machine tool to move eccentrically, and the stainless steel pipe is kept still.
The tool electrode 10 is connected with a driving device arranged on a machine tool, the driving device comprises a transmission rod 15, and when machining is carried out, the machine tool controls the transmission rod 15 to swing, so that the tool electrode 10 is driven to do eccentric motion through the transmission rod 15;
specifically, the transmission rod 15 swings clockwise in a swing plane ZY parallel to the plane of the discharge end 101, thereby realizing the eccentric motion of the tool electrode 10 around the central axis of the inner cavity of the stainless steel tube.
Illustratively, during the machining process, the non-electrical parameters satisfy:
the swing speed of the transmission rod 15 is 0.4-0.6 rpm, the machining clearance is 10-50 mu m, the machining speed is 0.02-0.045 g/min, and the unilateral feeding amount is 2.214-2.316 mm.
Specifically, as shown in fig. 16, the stainless steel pipe is placed on the contour positioning block 12 and the auxiliary bearing block 13 to clamp the stainless steel pipe.
The two equal-height positioning blocks 12 are used for clamping two sides of the position to be machined of the stainless steel pipe respectively, so that the stability of the position to be machined of the stainless steel pipe is ensured in the machining process. Illustratively, the distance between two contour blocks 12 is 30mm.
The two equal-height positioning blocks 12 are placed between the two auxiliary bearing blocks 13, and the two ends of the stainless steel pipe are supported and positioned by the two auxiliary bearing blocks 13, so that the stability of the stainless steel pipe in the machining process is further ensured.
As shown in fig. 18 to 19, the upper end surfaces of the equal-height positioning block 12 and the auxiliary bearing block 13 are flush, V-shaped grooves are formed in the upper end surfaces of the equal-height positioning block 12 and the auxiliary bearing block 13, and the stainless steel pipe is placed in the V-shaped grooves to limit the position of the stainless steel pipe.
Further, cover grip block 14 on V type groove to the joint is on equal altitude locating piece 12 to spacing stainless steel pipe, further improve stainless steel pipe's stability. Illustratively, the angle of the V-shaped groove is 60-90 degrees, and the depth is 5-10mm.
Before the stainless steel pipe is placed on the equal-height positioning block 12, firstly, a machine tool is used for centering and aligning the tool electrode 10, then the stainless steel pipe is inserted into the discharge end 101 of the tool electrode 10, finally, the equal-height positioning block 12, the auxiliary bearing block 13 and the clamping plate 14 are used for clamping the stainless steel pipe, and the equal-height positioning block 12 and the auxiliary bearing block 13 are used for centering the stainless steel pipe.
Specifically, after the tool electrode 10 is aligned, the XYZ axes of the machine tool are utilized to adjust the positions of the equal-height positioning block 12 and the auxiliary bearing block 13 on the machine tool so as to align the stainless steel tube, ensure that the central axis of the inner cavity of the stainless steel tube coincides with the central line of the discharge end 101 of the tool electrode 10, and facilitate determination of the unilateral feeding amount O 1 O 2 And further, the machining accuracy is improved.
The alignment process of the stainless steel pipe is as follows.
Firstly, fixing 2 equal-height positioning blocks 12 and 2 auxiliary bearing blocks 13 on a workbench 9 of a machine tool, and then utilizing a dial indicator pull gauge to align the side surface of the equal-height positioning blocks to be parallel to an X axis of the machine tool, wherein the parallelism error is less than or equal to 0.01mm.
Before the stainless steel pipe is placed on the equal-height positioning block 12, the stainless steel pipe is firstly penetrated into the discharging end 101 of the tool electrode 10, and then the stainless steel pipe is placed on the equal-height positioning block 12 and the auxiliary bearing block 13, so that the stainless steel pipe is aligned through the equal-height positioning block 12 and the auxiliary bearing block 13.
Wherein, one end of the transmission rod 15 is connected with the tool electrode 10 and is parallel to the central line of the discharge end 101 of the tool electrode 10; in the machining process, the other end of the transmission rod 15 is mounted on the machine tool so as to drive the transmission rod 15 to swing through the machine tool, and further drive the tool electrode 10 to move through the transmission rod 15, so that the discharge end 101 of the tool electrode 10 performs eccentric motion around the central axis of the inner cavity of the stainless steel pipe.
Therefore, the discharge end 101 of the tool electrode 10 eccentrically moves around the central axis of the inner cavity of the stainless steel pipe for a circle, so that the processing of the annular groove of the stainless steel pipe can be completed, one-time processing in place is realized, and the processing efficiency is obviously improved.
Compared with the prior art, the discharge end 101 of the tool electrode 10 comprises a plurality of electric spark machining points which are arranged around the circumference of the workpiece to be machined, the same electric spark machining point comprises a working state and a non-working state, when the tool electrode is used for electric spark machining of the annular groove of the workpiece to be machined, the distance between the electric spark machining points and the surface to be machined is continuously changed, the conversion between the working state and the non-working state is realized, and the working states of the electric spark machining points which are arranged around the circumference of the workpiece to be machined realize the machining of the annular groove on the surface to be machined, so that the discharge end 101 of the tool electrode 10 is prevented from being in a continuous machining state, and further the loss of the tool electrode 10 is reduced.
The plurality of electric spark machining point positions arranged around the circumferential direction of the workpiece to be machined form a continuous ring shape, the shape of the inner circle end of the ring is matched with that of the annular groove, the ring is sleeved on the outer end surface of the stainless steel pipe to perform eccentric motion, and in the process, the distance between the inner circle end surface of the discharge end 101 and the surface to be machined is changed continuously; when the inner circle end face of the discharge end 101 is close to the surface to be processed, the end face of the discharge end 101 is the working end 102, when the end face is far away from the surface to be processed, the end face is changed into the non-working end 103, dynamic change between the working end 102 and the non-working end 103 is realized, therefore, the working end 102 of the tool electrode 10 is prevented from being in a continuous processing state, the loss of the working end 102 of the tool electrode 10 is greatly reduced, the loss of the tool electrode 10 is not more than 1%, further, the deformation of the working end face of the tool electrode 10 is reduced, and therefore the accuracy of processing the annular groove of the stainless steel pipe is improved.
According to the tool electrode 10, the discharging end 101 is sleeved on the ultra-long stainless steel pipe to perform eccentric motion, when the tool electrode is machined, the distance between the discharging end 101 and the ultra-long stainless steel pipe is reduced from large to small and then increased from small to large, metal debris can be generated between the discharging end 101 and the stainless steel pipe in the process of reducing the distance from large to small, at the moment, part of the metal debris can be discharged along with working liquid through a machining gap, in the process of reducing the distance from small to large, the distance between the discharging end 101 and the stainless steel pipe can be increased by nearly 200 times, the efficiency of discharging the metal debris is remarkably improved, the metal debris is prevented from being accumulated at the discharging end 101 due to untimely discharge of the metal debris, the loss of the tool electrode 10 is reduced, and the risk of short circuit caused by the fact that the tool electrode 10 is directly connected with the stainless steel pipe through the metal debris is avoided.
The discharge end 101 of the tool electrode 10 is sleeved on the ultra-long stainless steel tube to perform eccentric motion, so that metal chips can be efficiently discharged, and further, the electric spark machining with a small machining gap is realized, so that the machining current and the machining voltage can be reduced, the machining cost is reduced, and an annular groove with low surface roughness can be obtained.
As shown in fig. 17, the machining of the annular grooves with different wall thicknesses can be realized by adjusting the value of the single-side feeding amount, the size machining of different oblique angles α can be realized by adjusting the shape of the discharge end 101 of the tool electrode 10, and a foundation is laid for the rapid production and the mass production of products.
The discharge end 101 of the tool electrode 10 eccentrically moves for a circle around the central axis of the inner cavity of the ultra-long stainless steel pipe, so that the processing of the annular groove of the ultra-long stainless steel pipe can be finished, the one-time processing in place is realized, and the processing efficiency is obviously improved.
The discharging end 101 of the tool electrode 10 eccentrically moves around the central axis of the inner cavity of the stainless steel pipe, so that the single-side feeding amount of the end surface of each position of the discharging end 101 is the same, the consistency of the processing depth of the annular groove is ensured, and the processing precision of the annular groove is improved.
The shape of the discharge end 101 of the tool electrode 10 is the same as that of the annular groove, namely the discharge end 101 is convex, the annular groove is groove-shaped, the cross-sectional dimension of the convex is the same as that of the groove-shaped cross-sectional dimension, therefore, after the discharge end 101 of the tool electrode 10 eccentrically moves around the central axis of the inner cavity of the ultra-long stainless steel pipe for one circle, the depth and the bevel angle of the processed annular groove are the required depth and bevel angle of the annular groove, and the processing precision is obviously improved.
The invention abandons the traditional turning mode for the ultra-long stainless steel pipe, utilizes the working end 102 of the tool electrode 10 to discharge and corrode and remove metal on the surface of the ultra-long stainless steel pipe, and carries out annular groove processing, namely in the processing process, the tool electrode 10 is not in contact with the surface of the ultra-long stainless steel pipe, so that the deformation of the ultra-long stainless steel pipe is avoided, and the problem of damage to the ultra-long stainless steel pipe caused by cutting force is solved.
According to the invention, the discharge end 101 of the tool electrode 10 eccentrically moves around the central axis of the inner cavity of the ultra-long stainless steel pipe to process the annular groove of the ultra-long stainless steel pipe, namely, in the processing process, the ultra-long stainless steel can be processed into the annular groove on the outer surface without moving, so that the problem that the processing precision is influenced by the coaxiality of the ultra-long stainless steel pipe in the rotation process is solved.
When the clamping device is used, the stainless steel pipes with the ultra-long lengths only need to be placed in the V-shaped grooves in the equal-height positioning blocks 12 and the auxiliary bearing blocks 13, the clamping plate 14 is used for limiting the upper surfaces of the stainless steel pipes with the ultra-long lengths, the clamping and the positioning of the stainless steel pipes with the ultra-long lengths can be achieved, the clamping is convenient, and the stability of the stainless steel pipes with the ultra-long lengths in the machining process can be ensured.
The method comprises the following specific steps:
step 1: adjusting the position of the tool electrode 10 by using the machine tool, so that the plane where the discharge end 101 of the tool electrode 10 is located is vertical to the working table 11 of the machine tool;
specifically, the worktable 11 of the machine tool is a horizontal plane, and the tool electrode 10 is vertically installed on the machine tool and connected with a transmission rod installed on the machine tool.
Step 2: clamping the gas circuit main body 1-2 by using a bearing assembly, and aligning the gas circuit main body 1-2;
specifically, the gas path main body 1-2 is a stainless steel tube. Firstly, fixing two equal-height positioning blocks 12 and two auxiliary bearing blocks 13 on a working table top 11, aligning the side surfaces of the equal-height positioning blocks and the two auxiliary bearing blocks to be parallel to the X axis of a machine tool by using a dial indicator, and adjusting the positions of the equal-height positioning blocks 12 and the auxiliary bearing blocks 13 by using the machine tool, wherein the error of parallelism is less than or equal to 0.01mm.
Then placing the stainless steel pipe on the equal-height positioning blocks 12, penetrating the stainless steel pipe through the inner round end of the lower end of the tool electrode 10 before placing, ensuring that the stainless steel pipe is in a horizontal position through the equal-height positioning blocks 12, and ensuring that the distance between the two equal-height positioning blocks 12 is 30mm;
then both ends of the stainless steel pipe are placed on the auxiliary bearing blocks 13 and finally fixed by the clamping plates 14.
And step 3: the center line of the discharge end 101 of the tool electrode 10 is adjusted by a machine tool to coincide with the central axis of the inner cavity of the stainless steel pipe;
specifically, the position of the stainless steel tube is first adjusted by moving the carrier assembly in the X-axis direction by the machine tool so that the position to be machined of the stainless steel 6 is located within the discharge end 101 of the tool electrode 10;
then, by means of the automatic centering module of the machine tool, measure S 11 、S 12 、S 13 、S 14 If the four numerical values are equal or the error is within +/-0.02 mm, the coincidence of the center of the discharge end 101 of the tool electrode 10 and the central axis of the inner cavity of the stainless steel tube is realized, and if the four numerical values are not coincident, the position of the bearing assembly is continuously adjusted by a machine tool until the requirements are met.
And 4, step 4: kerosene and water were used as working liquids, and the stainless steel pipe was subjected to electric discharge machining using the tool electrode 10 in the working liquid.
Specifically, step 4 includes the steps of:
step 41: controlling the discharge end 101 of the tool electrode 10 to eccentrically move around the central axis of the inner cavity of the stainless steel pipe;
specifically, the machine tool drives the transmission rod 15 to swing on the YZ plane, and then the discharge end 101 of the tool electrode 10 is controlled to perform eccentric motion around the central axis of the inner cavity of the stainless steel tube through the transmission rod 15, and the eccentric motion direction 17 is shown in fig. 14.
Wherein the swing speed of the transmission rod 15 is 0.5rpm;
S 11 、S 12 、S 13 、S 14 actual measurement values were 2.055mm, 2.060mm, 2.065mm, and 2.050mm, respectively, at which time S was measured 1 ＝2.058mm；
Machining gap S 2 Is 10 μm;
single side feed O 1 O 2 ＝S 1 +(H 1 -H 2 )-S 2 ＝2.058+(0.5-0.3)-0.01＝2.248mm；
The processing speed was 0.04g/min.
Step 42: when the tool electrode 10 is eccentrically moved, the tool electrode 10 is energized to perform electric discharge machining.
Specifically, the electrical parameters satisfy:
pulse width 40 μ s, pulse interval 26 μ s, average machining current 1A, and average machining voltage 40V.
The annular groove processing is carried out on #01 to #10 pieces of ultra-long stainless steel pipes by using the processing method, and the processing parameters are shown in the following table 1.
TABLE 1 processing parameters
Figure BDA0003972587240000281
Processing requirements are as follows: the wall thickness of the annular groove is 0.3 +/-0.05 mm, and the bevel angle alpha is 90 degrees.
The results are shown in Table 2 below.
TABLE 2 test results
Figure BDA0003972587240000282
Figure BDA0003972587240000291
Wherein, the electrode consumption ratio is E/W100%, wherein E is the diameter size variation of the discharge end of the tool electrode, and W is the initial diameter size of the inner circle end of the tool electrode.
As can be seen from Table 2, the average value of the groove depth of the annular groove of 10 stainless steel pipes processed by the method is 0.2146mm, the standard deviation is 0.01427, the dispersion coefficient is 0.07, the angles of the annular groove are all 90 degrees, the average value of the wall thickness of the annular groove is 0.299mm, the standard deviation is 0.006681, and the dispersion coefficient is 0.02.
The ratio of the diameter to the length is 1. For example, the stainless steel tube used on a certain aviation product has the outer diameter of 2mm, the inner diameter of 1mm and the length of 1-1.2 m, and the ratio of the outer diameter to the length of the stainless steel tube is 1-600, and the stainless steel tube belongs to an ultra-long stainless steel tube. An annular groove is generally required to be processed on the ultra-long steel pipe, and the annular groove is an annular groove and used for separating the flying product guidance system from the product fairing body when a product reaches a preset height and position.
Because the diameter of the superfine stainless steel pipe is small, the wall thickness is thin, and the wall thickness of the annular groove is thinner, such as 0.3 +/-0.05 mm, the important size of the superfine stainless steel pipe cannot be obtained through direct measurement; when a V-shaped annular groove is machined at a certain position of the ultra-long stainless steel pipe, the wall thickness of the position of the annular groove is difficult to ensure by adopting the traditional turning machining mode, because the centrifugal force of the workpiece caused by overlong length in the rotation process is larger, the coaxiality of the workpiece is poorer, and the generated cutting force easily causes the ultra-long stainless steel pipe to deform.
If the existing electric spark machining device is adopted to machine the annular groove of the ultra-long stainless steel pipe, the ultra-long stainless steel pipe needs to be rotated, and then the tool electrode is continuously pushed on the surface of the ultra-long stainless steel pipe for machining, but because the ultra-long stainless steel pipe is longer, the centrifugal force causing the rotation of a workpiece in the rotation process is larger, the coaxiality of the workpiece is poorer, and the wall thickness at the position of the annular groove is difficult to ensure; in the machining process, part of the total energy is released to the tool electrode, so that tool loss is caused, the shape of the lost tool electrode is finally copied on the ultra-long stainless steel pipe, and the machining precision of the annular groove is seriously influenced.
The wall thickness of the annular groove is thin, so that the requirements on positioning and machining precision are high, and the important size of the annular groove cannot be obtained through direct measurement; when the annular groove is machined at a certain position of the ultra-long stainless steel pipe, the wall thickness of the annular groove is difficult to ensure by adopting the traditional turning machining device, and even if the existing electric spark machining device is adopted, the wall thickness of the annular groove is difficult to ensure.
The above-mentioned annular groove is finished by using the following processing device. The machining device comprises a tool electrode 10, a bearing assembly and a driving assembly, wherein the tool electrode 10, the bearing assembly and the driving assembly are installed on a machine tool, the bearing assembly is used for clamping a stainless steel pipe, and the driving assembly is used for driving the tool electrode 10 to eccentrically move around the central axis of an inner cavity of the stainless steel pipe so as to realize electric spark machining of an annular groove of the stainless steel pipe, and solve the problem that the existing annular groove is difficult to machine on a super-slender stainless steel pipe.
Specifically, one end of the tool electrode 10 is annular, the inner circle end of the annular is matched with the annular groove in shape, the other end of the tool electrode 10 is a conductive end 104, and the conductive end is electrically connected with one output end of a power supply device arranged on the machine tool and used for introducing current and transmitting the current to the inner circle end, at the moment, the inner circle end is a discharge end 101, and the discharge end 101 is sleeved on the outer end face of the stainless steel pipe; when the tool electrode 10 eccentrically moves, the distance between the end face of the discharge end 101 and the end face to be machined of the stainless steel tube is continuously changed, the distance is 10-50 μm, namely the working end 102, and the distance greater than 50 μm, namely the non-working end 103, is in a working state. Wherein, the processing tracks of all the working ends 102 form an annular groove of the ultra-long stainless steel tube together.
Wherein the inner round end of the discharge end 101 of the tool electrode 10The center coincides with the central axis of the inner cavity of the stainless steel pipe, and a margin gap is arranged between the discharge end 101 and the outer end surface of the stainless steel pipe, wherein the diameter of the end surface of the discharge end 101 is 20mm and is 10 times of the outer diameter of the stainless steel pipe, so that the unilateral feeding amount O can be determined conveniently 1 O 2 A value of (d); during processing, the tool electrode 10 is driven to swing by the driving assembly, and at the moment, the discharge end 101 of the tool electrode 10 is in an eccentric motion state around the central axis of the inner cavity of the stainless steel pipe.
In which the measurement S is carried out by means of an automatic centering module on the machine tool 11 、S 12 、S 13 、S 14 Respectively 2.055mm, 2.060mm, 2.065mm, 2.050mm, in which case S 1 ＝2.058mm。
Wherein S is 2 ＝10μm；H 1 ＝0.5mm，H 2 ＝0.3mm，S 1 =2.058mm, at this time, O 1 O 2 ＝2.248mm。
After the center of the discharge end 101 of the tool electrode 10 is adjusted to coincide with the central axis of the inner cavity of the stainless steel tube, the tool electrode 10 is in an eccentric motion state under the action of the driving assembly.
The conductive end 104 of the tool electrode 10 is electrically connected to one output end of a power supply device disposed on the machine tool, and the stainless steel tube is electrically connected to the other output end of the power supply device, wherein the power supply device includes a pulse power supply, and two output ends of the pulse power supply are respectively connected to the positive electrode and the negative electrode of the pulse power supply for outputting pulse voltage.
Wherein, in the course of processing, the electrical parameter satisfies:
pulse width 40 μ s, pulse interval 26 μ s, average machining current 1A, and average machining voltage 40V.
Specifically, the driving assembly comprises a transmission rod 15, one end of the transmission rod 15 is connected with the tool electrode 10, the other end of the transmission rod 15 is mounted on a machine tool, the transmission rod 15 can be controlled to swing through the machine tool, 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. Wherein, during processing, the stainless steel pipe is kept still.
Wherein, in the processing process, the non-electric parameters satisfy:
the swing speed of the driving rod 15 is 0.5rpm, and the machining gap S 2 10 μm, a processing speed of 0.04g/min, a single-side feed O 1 O 2 Is 2.248mm.
Specifically, the bearing assembly comprises an equal-height positioning block 12 and an auxiliary bearing block 13 which are installed on a machine tool, so that the stainless steel pipe is placed on the equal-height positioning block 12 and the auxiliary bearing block 13 to clamp the stainless steel pipe.
Wherein, two equal-height positioning blocks 12 are arranged, the two equal-height positioning blocks 12 are respectively positioned at two sides of the position to be processed of the stainless steel pipe, and the distance between the two equal-height positioning blocks 12 is 30mm.
Wherein, be equipped with two auxiliary bearing blocks 13, two equal altitude locating pieces 12 are located between two auxiliary bearing blocks 13 to support, fix a position the both ends of stainless steel pipe through two auxiliary bearing blocks 13.
The upper end faces of the equal-height positioning block 12 and the auxiliary bearing block 13 are flush, V-shaped grooves are formed in the upper end faces of the equal-height positioning block 12 and the auxiliary bearing block 13, and the stainless steel pipe is placed in the V-shaped grooves to limit the position of the stainless steel pipe.
Furthermore, the equal-height positioning blocks 12 are also provided with clamping plates 14, and the clamping plates 14 cover the V-shaped grooves and are clamped on the equal-height positioning blocks 12 to limit the stainless steel pipes, so that the stability of the stainless steel pipes is further improved. Illustratively, the V-groove has an angle of 90 ° and a depth of 10mm.
Before the stainless steel pipe is placed on the equal-height positioning block 12, firstly, the tool electrode 10 needs to be centered and aligned, then, the stainless steel pipe penetrates into the discharge end 101 of the tool electrode 10, finally, the equal-height positioning block 12, the auxiliary bearing block 13 and the clamping plate 14 are used for clamping the stainless steel pipe, and the stainless steel pipe is aligned through the equal-height positioning block 12 and the auxiliary bearing block 13.
Wherein, one end of the transmission rod 15 is connected with the tool electrode 10 and is parallel to the central line of the discharge end 101 of the tool electrode 10; in the machining process, the other end of the transmission rod 15 is mounted on the machine tool so as to move through the machine tool to drive the transmission rod 15 to swing, and then the transmission rod 15 drives the tool electrode 10 to move, so that the discharge end 101 of the tool electrode 10 performs eccentric motion around the central axis of the inner cavity of the stainless steel pipe.
Therefore, the discharge end 101 of the tool electrode 10 eccentrically moves for a circle around the central axis of the inner cavity of the stainless steel pipe, so that the annular groove of the stainless steel pipe can be machined, one-time machining is realized, and the machining efficiency is remarkably improved.
EXAMPLE five
Because the gas path main body 1-2 is provided with the weak part 7, the weak part is easy to break in the subsequent turnover and processing processes. In view of the above, the present embodiment provides a protection tool 8 for protecting the weak portion in the first embodiment.
As shown in fig. 6, the protection tool comprises a protection main body 8-1 and a pressing piece 8-2, the protection main body 8-1 is used for accommodating the weak portion 7 on the gas circuit main body 1-2, and the pressing piece 8-2 is used for fixing the gas circuit main body 1-2 in the protection main body 8-1 so as to fix the weak portion 7. The pressing piece 8-2 is sleeved on the protection main body 8-1.
Specifically, one end of the protection main body 8-1 is closed, a through groove 8-4 along the radial direction of the protection main body 8-1 is formed in the protection main body, and one end of the air path main body 1-2 penetrates through the through groove 8-4 until the weak part 7 is located in the through groove 8-4.
Considering that the gas circuit main body 1-2 is longer, if one end of the gas circuit main body 1-2 needs to pass through the through groove, the weak part can be placed in the through groove, and the operation is inconvenient. Thus, in a preferred embodiment, the through-slot 8-4 extends from one end of the protective body 8-1 to the other end of the protective body 8-1, such that the other end of the protective body 8-1 is an open end. Because the through groove 8-4 extends from one end of the protection main body 8-1 to the other end of the protection main body 8-1, when the gas circuit protection device is used, one end of the gas circuit main body 1-2 does not need to penetrate through the through groove, and the weak part 7 only needs to enter from the opening at the other end of the protection main body 8-1, so that the weak part 7 can be positioned in the through groove 8-4, and the operation convenience is greatly improved.
In a possible embodiment, the pressure element 8-2 is provided with a through hole for the passage of the protective body. The pressing piece 8-2 is in threaded connection with the protection body 8-1. Illustratively, the outer surface of the protection main body is provided with external threads, and the through hole of the pressing piece is provided with internal threads.
Preferably, the protection tool further comprises an anti-loosening element 8-3. The anti-loosening piece 8-3 is arranged on the outer side of the pressing piece 8-2 and close to the opening end of the protection main body 8-1 and is used for preventing the pressing piece 8-2 from loosening so as to prevent the weak part from moving out of the through groove 8-4 of the protection main body 8-1. The structure of the anti-loosening piece 8-3 can be the same as that of the pressing piece, and other structures can be adopted as long as the function of preventing the pressing piece from loosening can be achieved.
In order to reduce the processing difficulty, the protection main body 8-1 of the embodiment can adopt a bolt, a through groove is processed on the screw rod along the length direction to form a radial through groove, and the anti-loosening piece and the pressing piece can both adopt nuts.
Those skilled in the art will appreciate that all or part of the flow of the method implementing the above embodiments may be implemented by a computer program, which is stored in a computer readable storage medium, to instruct related hardware. The computer readable storage medium is a magnetic disk, an optical disk, a read-only memory or a random access memory.
The invention provides a new pipeline structure capable of meeting two functions of ventilation and electric signal transmission by analyzing narrow space and corresponding functional requirements, a stainless steel pipe forming pipeline main body and a sleeve pipe assembly with various small diameters can meet the minimum requirements of space and positioning, the selected thermocouple wire structure can meet the insulation requirements, corresponding pipeline welding, sleeve pipe and bending steps are arranged in a novel and reasonable mode, insulation detection is carried out aiming at each step, the insulation performance of parts is synchronously ensured on the basis of effectively forming the appearance of the pipeline, and two functions of ventilation and electric signal transmission of the pipeline are achieved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.

Claims (10)

1. A gas-electric dual-function pipeline easy to break and fall off is characterized by comprising a gas circuit component, a thermocouple, a filler neck and an electric connector;
the gas circuit assembly is connected with the filler neck and is used for realizing ventilation of a pipeline; the thermocouple is fixed on the gas circuit component, and the free end of the thermocouple is connected with the electric connector and used for realizing an electrifying signal of a pipeline;
the gas circuit component comprises a connecting seat and a gas circuit main body; the gas circuit main body is provided with a weak part so as to facilitate the breaking and falling of the pipeline.
2. A gas-electric dual-function pipeline easy to break and fall off according to claim 1, wherein the weak portion is an annular groove circumferentially arranged along the outer surface of the gas channel main body.
3. A gas-electric double-function pipeline easy to break off according to claim 2, wherein the depth of the groove is 0.3mm.
4. The easy-to-break and-off gas-electric dual-function pipeline as claimed in claim 1, further comprising a sleeve assembly, wherein the sleeve assembly is sleeved outside the gas circuit assembly and the thermocouple for protecting the gas circuit assembly and the thermocouple;
the sleeve assembly comprises a first sleeve component and a second sleeve component, and the second sleeve component is arranged at the downstream of the first sleeve component; the weakened portion is disposed between the first and second sleeve assemblies.
5. A gas-electric dual-function pipeline easy to break and fall off according to claim 1, wherein the wall thickness of the gas pipeline main body is 0.2mm.
6. A processing method of a weak part on a pipeline with gas and electricity double functions is characterized in that the processing method is used for processing the weak part on the pipeline with gas and electricity double functions which is easy to break and fall off and is disclosed by any one of claims 1 to 5, and the processing method comprises the steps of utilizing the working state of a plurality of electric spark processing points which are arranged around the circumference of a stainless steel pipe of a tool electrode to realize the processing of a breaking groove on a surface to be processed;
and changing the distance between the electric spark machining point and the surface to be machined to enable the same electric spark machining point to be in a working state or a non-working state.
7. The method for processing the weak part on the pipeline with gas and electricity dual functions as claimed in claim 6,
when the distance between the electric spark machining point and the surface to be machined is larger than a threshold value, the electric spark machining point is in a non-working state;
when the distance between the electric spark machining point and the surface to be machined is smaller than or equal to a threshold value, the electric spark machining point is in a working state;
processing an annular groove on the surface to be processed by the working states of a plurality of electric spark processing point positions arranged around the circumference of the part to be processed;
the threshold is the discharge distance between the electric spark machining point position meeting the machining requirement and the surface to be machined.
8. The method for machining the weak part on the pipeline with the gas-electric dual-function as claimed in claim 7, wherein the discharging end of the tool electrode is sleeved on the gas circuit main body, and during machining, the discharging end of the tool electrode eccentrically moves around the central axis of the inner cavity of the gas circuit main body.
9. The method for processing the weak part on the pipeline with gas and electricity dual functions as claimed in claim 8, wherein: in the eccentric motion of the tool electrode, the single-side feed amount O 1 O 2 Satisfies the following conditions:
O 1 O 2 ＝S 1 +(H 1 -H 2 )-S 2
wherein H 1 The wall thickness of the stainless steel tube; h 2 The wall thickness of the breaking groove; s. the 1 For the discharge end of the tool electrode before machiningThe distance between the outer end faces of the stainless steel pipes; s. the 2 Is a machining gap;
wherein the distance S between the discharge end of the tool electrode and the outer end face of the stainless steel tube 1 Satisfies the following conditions:
Figure FDA0003972587230000021
wherein S is 11 、S 12 、S 13 、S 14 The four points are uniformly distributed on the circular discharge end of the tool electrode for the actual allowance gap value between the four points selected on the circular discharge end of the tool electrode and the outer end face of the stainless steel pipe.
10. A processing apparatus for a weak portion, characterized by being adapted to process a weak portion as claimed in any one of claims 6 to 9.
CN202211518172.9A 2022-11-30 2022-11-30 Gas-electric dual-function pipeline easy to break and fall off and processing method of weak part Pending CN115807880A (en)

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