CN111347181A - Laser welding positioning tool for vibrating cylinder pressure sensor assembly and machining process - Google Patents
Laser welding positioning tool for vibrating cylinder pressure sensor assembly and machining process Download PDFInfo
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- CN111347181A CN111347181A CN202010264869.2A CN202010264869A CN111347181A CN 111347181 A CN111347181 A CN 111347181A CN 202010264869 A CN202010264869 A CN 202010264869A CN 111347181 A CN111347181 A CN 111347181A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/0426—Fixtures for other work
- B23K37/0435—Clamps
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- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention discloses a laser welding positioning tool and a processing technology used in the processing process of a vibrating cylinder pressure sensor component, the tool comprises a compression nut and an extrusion cushion block which are respectively arranged at two ends of an outer cylinder, the outer cylinder is arranged between the compression nut and the extrusion cushion block in a pressing way, a positioning core shaft extends into the outer cylinder through an inner hole matched with the inner diameter of the outer cylinder on the extrusion cushion block, the end part of the positioning core shaft is in threaded connection with the compression nut, limiting planes facing coil holes are arranged at coil holes on the positioning core shaft corresponding to the coil holes, one end of a heat dissipation block is sleeved with a coil base and extends into the coil holes, the top end of a jacking screw is arranged at the other end of a heat dissipation block, the jacking screw and the corresponding coil hole are arranged in the same axial direction, and the jacking screw is screwed in. The tool is small in disassembly difficulty and small in influence on the size of the assembly. The process adopts the technological processes of laser welding positioning and vacuum brazing, and can complete the welding of the whole batch of components by only one set of tool at least.
Description
Technical Field
The invention belongs to the technical field of welding tools, and particularly relates to a laser welding positioning tool for a vibrating cylinder pressure sensor assembly and a machining process.
Background
Pressure of vibration cylinderThe sensor component requires that 4 coil bases 4 with the wall thickness of about 0.4mm are welded on the circumference of the outer cylinder 3, 4 holes matched with the outer diameter of the coil bases 4 are uniformly processed on the outer cylinder 3 along the circumferential direction of the outer circle, the coil bases 4 are arranged in the corresponding holes of the outer cylinder to form four intersecting line welding seams during processing, and the leakage rate of the welding seams at the 4 positions after welding is required to be not more than 1 × 10-10Pa.m3The distance between two opposite coil bases 4 has the dimensional tolerance of +/-0.1 mm, and the symmetry degree relative to the center of the inner circle of the outer cylinder 3 is less than 0.1 mm; the outer cylinder 3 and the coil base 4 are made of dissimilar materials, the wall thickness of the coil base is thin, a welding seam is of a tubular structure, the size requirement of the welded assembly is high, and vacuum brazing is the most suitable method at present.
The existing welding process flow is as follows: 1) a mandrel tool with a low linear expansion coefficient is used for ensuring the distance size and the symmetry size, and the outer cylinder 3 and the coil holder 4 are assembled in sequence; 2) coating paste nickel-based brazing filler metal at the position of a welding seam; 3) pressing 4 coil bases 4 to the plane of the mandrel by using a jacking tool; 4) carrying out vacuum brazing at the welding temperature of about 1000 ℃; 5) taking down the welded assembly from the tool; 6) the distance and symmetry dimensions of the assembly are checked using a three-coordinate or projection detector. The following problems exist in the process flow: 1) each component needs to use one set of welding tool, the tool needs a large amount during large-scale processing, for example, 100 sets of tools are needed for welding 100 components at one time; 2) the jacking tool is of a threaded structure, threads deform under stress at high temperature, the phenomenon of serious clamping stagnation of the threads is easy to occur, the disassembly efficiency is influenced, even the assembly cannot be taken out, and the repair rate of the daily jacking tool is more than 30%; 3) the raw material with low linear expansion coefficient is expensive, so that the tooling cost is high; 4) in the process of taking the component off the mandrel, the coil holder 4 is tightly attached to the plane of the mandrel to form larger friction force, so that the taking-off difficulty is higher, and the phenomena of component deformation, clamping and the like can be inevitably caused; 5) under the influence of various factors such as tooling, welding high-temperature deformation, an assembly process, a disassembly process and the like, the welded assembly has a certain proportion of size out-of-tolerance and needs to be subjected to size detection in whole batch; 6) the condition that brazing filler metal is adhered to the tool exists in the vacuum brazing process, and the tool and even the assembly are scrapped simultaneously.
Disclosure of Invention
Object of the Invention
Aiming at the problems in the prior art, the laser welding positioning tool is better in positioning effect and lower in assembly disassembly difficulty, and the machining process is higher in qualified rate, higher in efficiency and lower in cost.
Technical solution of the invention
In order to achieve the purpose, the invention adopts the following technical scheme:
a laser welding location frock for vibration section of thick bamboo pressure sensor subassembly course of working, this frock is including setting up in gland nut and the extrusion cushion at urceolus both ends respectively, the urceolus is pressed and is located between gland nut and the extrusion cushion, the location dabber extends in the urceolus with urceolus internal diameter assorted hole on the extrusion cushion, and the tip and the gland nut threaded connection of location dabber, the coil hole department that corresponds the urceolus on the dabber all is provided with the spacing plane towards the coil hole, a pot head of radiating block is equipped with the coil base and extends the coil downthehole, the other end of radiating block is located on the top of top set screw, and the coil hole axle center syntropy that top set screw and correspond sets up, top set screw locates in the guiding mechanism who has the guiding hole soon.
Preferably, the guide mechanism is an arc clamp, threaded holes are coaxially formed in the two ends of the guide mechanism, the two ends of the guide mechanism extend to the outer sides of the two opposite side coil holes of the outer barrel respectively, and the jacking screws corresponding to the heat dissipation blocks in the coil holes on the two opposite sides are rotatably arranged in the threaded holes in the two ends of the guide mechanism respectively.
Preferably, the inner hole of the extrusion cushion block is a stepped hole, the positioning mandrel is a stepped shaft, the other end of the positioning mandrel is a large-diameter end, and the other end of the positioning mandrel is clamped in the inner hole of the extrusion cushion block.
Preferably, the positioning mandrel is provided with four limiting planes which are opposite to each other in pairs and are symmetrical by taking the axis of the positioning mandrel as a symmetry axis.
Preferably, the distance tolerance between every two opposite limiting planes on the positioning mandrel is +/-0.005 mm, and the symmetry degree is not more than 0.005 mm.
Preferably, the inner hole of the extrusion cushion block is a two-stage stepped hole with a small upper part and a large lower part, and the matching length of the hole with the smaller inner diameter and the positioning mandrel is 5-10 mm.
Preferably, the heat dissipation block is made of copper.
Preferably, the hardness of the positioning mandrel is HRC 40-HRC 60.
Preferably, the extrusion cushion block and the positioning core shaft are coaxially arranged, and the gap between the inner hole of the extrusion cushion block and the outer circle of the positioning core shaft is not more than 0.01 mm.
The processing technology of the vibrating cylinder pressure sensor assembly comprises the following steps:
1) assembling: assembling an extrusion cushion block on a positioning mandrel, assembling an outer cylinder on the positioning mandrel, fixing the outer cylinder, the extrusion cushion block and the positioning mandrel by using a compression nut, installing 2 coil bases into two symmetrical holes of the outer cylinder, arranging a heat dissipation block in the coil base, screwing a jacking screw into a thread of a guide mechanism, and jacking the heat dissipation block by using the guide mechanism and the jacking screw to enable the coil base to be tightly attached to the positioning mandrel 8; 2) laser welding and positioning: carrying out laser welding positioning by using a pulse laser welding machine, controlling the energy of a single pulse to be 4J-6J so as to ensure that a welding spot has certain strength but does not burn through a coil base, protecting the welding seam by using inert gas in the positioning process, and uniformly distributing 3-4 spot welding positions along each intersecting line welding seam; 3) and (3) second positioning: taking down the guide mechanism and the heat dissipation block, and repeating the steps 1) and 2) to position the other two coil bases by laser welding; 4) cleaning: wiping off metal dust/steam near the positioning point by using absorbent cotton dipped with alcohol; 5) disassembling: taking down the guide mechanism, the jacking screw and the heat dissipation block, taking down the compression nut, taking down the positioned component from the positioning mandrel, and pressing out the component from the positioning mandrel by using a hand press according to needs; 6) checking the size of a first workpiece: checking whether the size of the assembly after the first piece is positioned meets related requirements by using a three-coordinate or projection detector; 7) batch positioning: after the size of the first component meets the requirement, carrying out laser welding positioning on the whole batch of components according to the requirements 1) to 5); 8) solder coating: uniformly coating a paste nickel-based brazing filler metal at the position of a positioned welding seam of the assembly, wherein the brazing filler metal is required to completely cover the welding seam; 9) vacuum brazing: and (3) putting the components which are subjected to laser welding positioning and solder coating into a vacuum brazing furnace, and if the number of the components exceeds the maximum furnace loading amount of the brazing furnace, carrying out batch-wise operation according to the actual condition, and then carrying out vacuum brazing according to the temperature curve of the selected brazing filler metal.
Preferably, the inert gas used in the positioning process in step 2) comprises argon and nitrogen.
THE ADVANTAGES OF THE PRESENT INVENTION
The invention has the advantages that:
(1) the tool is small in disassembly difficulty and small in influence on the size of the assembly. According to the invention, the extrusion cushion block 7 is additionally arranged, so that after laser welding positioning, the assembly can be ejected out of the core shaft by applying force to the extrusion cushion block by using a hand press with the threaded end on the positioning core shaft 8 as a fulcrum.
(2) The optional face of frock raw and other materials widens. In the invention, except that the positioning core shaft 8 is made of a material with good wear resistance and difficult deformation, other tools can be made of stainless steel, aluminum alloy, copper alloy and other materials, and compared with the existing tool which only adopts a material with a low thermal expansion coefficient, the convenience of tool processing is improved.
(3) The consistency of assembly is guaranteed. Through using the bow clamp 1 of packing into the puller screw 6 to transmit the puller force to the plane inside the coil base 4 through the radiating block 5, the size difference that the puller force is inconsistent to lead to when can avoid bare-handed compressing has guaranteed the uniformity of assembly at every turn.
(4) The process tool has less demand. By adopting the process flow of laser welding positioning firstly and vacuum brazing secondly, the welding of the whole batch of components can be completed by only one set of tool at least, and compared with the prior art that one component needs one set of tool, the tool requirement is greatly reduced. The welding efficiency is improved. The condition that the number of single furnace welding in the prior art is limited by the number of tools is changed, a batch of assemblies are often subjected to vacuum brazing for multiple times, and once welding can be realized when the number of the assemblies is smaller than the maximum furnace loading amount of a vacuum brazing furnace. The disassembly difficulty is reduced. The invention only needs to disassemble the assembly after laser welding positioning, and the assembly and the tool are not influenced by factors such as high temperature, welding flux and the like in the laser welding positioning process, so that the assembly can be easily separated from the tool. The processing period is shortened. The laser welding positioning and solder coating process in the invention is approximately equivalent to the processing time of the assembly process in the prior art, but the invention can reduce the number of vacuum brazing furnaces and the number of size checks and shorten the processing period by about 40 percent. The qualification rate is improved. The invention can improve the qualification rate of the assembly to more than 95 percent, and compared with the qualification rate of about 60 to 70 percent in the prior art, the qualification rate can be improved by 25 percent.
Drawings
FIG. 1 is a side view of the assembly of the present invention assembled with a laser welding positioning fixture used in the process of making a vibrating cylinder pressure sensor assembly.
Fig. 2 is a sectional view a-a of fig. 1.
FIG. 3 is an exploded view of the assembly of the laser welding positioning tool for the vibrating cylinder pressure sensor assembly during processing.
In the figure: 1-a bow-shaped clamp, 2-a compression nut, 3-an outer cylinder, 4-a coil base, 5-a heat dissipation block, 6-a tightening screw, 7-a pressing cushion block, 8-a positioning mandrel and 81-a limiting plane.
Detailed Description
The technical solution of the present invention will be explained below with reference to the accompanying drawings.
See fig. 1-3, a laser welding positioning tool for a vibrating cylinder pressure sensor component machining process, the tool comprises a compression nut 2 and an extrusion cushion block 7 which are respectively arranged at two ends of an outer cylinder 3, the outer cylinder 3 is arranged between the compression nut 2 and the extrusion cushion block 7 in a pressing mode, a positioning core shaft 8 extends into the outer cylinder 3 through an inner hole matched with the inner diameter of the outer cylinder 3 on the extrusion cushion block 7, the end part of the positioning core shaft 8 is in threaded connection with the compression nut 2, the relative position of the outer cylinder 3 after being installed is guaranteed to be unchanged through threaded connection between the compression nut 2 and the positioning core shaft 8, a limiting plane 81 facing a coil hole is arranged at a coil hole corresponding to the outer cylinder 3 on the positioning core shaft 8, and four limiting planes 81 are arranged on the positioning core shaft 8 in a pairwise opposite mode and are symmetrically. One pot head of radiating block 5 is equipped with coil holder 4 and extends the coil downthehole, guarantees that laser welding positioning process part is difficult for burning through putting into coil holder 4 with radiating block 5, and the other end of radiating block 5 is located on the top of top set screw 6, and the coil hole axle center syntropy that just top set screw 6 and correspond sets up, and top set screw 6 is located soon in the guiding mechanism 1 that has the guiding hole. The extrusion cushion block 7 is mainly used for the disassembly process after the laser welding positioning is finished, and the related size of the assembly is ensured by the positioning core shaft 8.
In this embodiment, the guiding mechanism 1 is a bow-shaped clamp, threaded holes are coaxially formed in two ends of the guiding mechanism 1, two ends of the guiding mechanism 1 extend to the outer sides of two opposite side coil holes of the outer cylinder 3 respectively, the jacking screws 6 corresponding to the heat dissipation blocks 5 in the coil holes on two opposite sides are rotatably arranged in the threaded holes at two ends of the guiding mechanism 1 respectively, and the jacking screws 6 are screwed into the bow-shaped clamp 1 and then transmit jacking force to the inner plane of the coil base 4 through the heat dissipation blocks 5.
The inner hole of the extrusion cushion block 7 is a stepped hole, the positioning core shaft 8 is a stepped shaft, the extrusion cushion block 7 is in clearance fit with the positioning core shaft 8, the other end of the positioning core shaft 8 is a large-diameter end, and the other end of the positioning core shaft 8 is clamped in the inner hole of the extrusion cushion block 7.
The inner hole of the extrusion cushion block 7 is a two-stage stepped hole with a small upper part and a large lower part, and the matching length of the hole with the smaller inner diameter and the positioning mandrel 8 is 5-10 mm. Extrusion cushion 7 and 8 coaxial settings of location dabber and the extrusion cushion 7 hole is not more than 0.01mm with the clearance between the 8 excircles of location dabber to the transmission direction of control extrusion process power all follows the cylindrical axial of dabber.
The heat dissipation block 5 is made of copper.
The hardness of the positioning mandrel 8 is HRC 40-HRC 60.
The processing technology of the vibrating cylinder pressure sensor assembly comprises the following steps: 1) assembling: the following assembly was performed in the order shown in FIG. 1: assembling an extrusion cushion block 7 on a positioning mandrel 8, assembling an outer cylinder 3 on the positioning mandrel 8, fixing the outer cylinder 3, the extrusion cushion block 7 and the positioning mandrel by using a compression nut 2, installing 2 coil bases 4 into two symmetrical holes of the outer cylinder 3, installing a heat dissipation block 5 in the coil base 4, screwing a jacking screw 6 into a thread of an arch clamp 1, and jacking the heat dissipation block 5 by using the arch clamp 1 and the jacking screw 6 to enable the coil bases 4 to be tightly attached to the positioning mandrel 8; 2) laser welding and positioning: carrying out laser welding positioning by using a pulse laser welding machine, controlling the energy of a single pulse to be 4J-6J so as to ensure that a welding spot has certain strength but cannot burn through the workpiece 2, protecting the welding seam by using inert gas (argon, nitrogen and the like) in the positioning process, and uniformly distributing 3-4 positions of spot welding positioning along each intersecting line welding seam; 3) and (3) second positioning: taking down the arch clamp and the heat dissipation block, and repeating the steps 1) and 2) to position the other two coil bases 4 by laser welding; 4) cleaning: wiping off metal dust/steam near the positioning point by using absorbent cotton dipped with alcohol; 5) disassembling: take off bow-shaped clamp 1, top tight screw 6 and radiating block 5, take off gland nut 2, take off the subassembly that will fix a position from positioning core axle 8, can use the hand press as required to extrude the subassembly from positioning core axle 8, promptly: pressing the extrusion cushion block 7 by taking the threaded end of the positioning mandrel 8 as a fulcrum; 6) checking the size of a first workpiece: checking whether the size of the assembly after the first piece is positioned meets related requirements by using a three-coordinate or projection detector; 7) batch positioning: after the size of the first component meets the requirement, carrying out laser welding positioning on the whole batch of components according to the requirements 1) to 5); 8) solder coating: uniformly coating a paste nickel-based brazing filler metal at the position of a positioned welding seam of the assembly, wherein the brazing filler metal is required to completely cover the welding seam; 9) vacuum brazing: the components which are subjected to laser welding positioning and solder coating are placed in a vacuum brazing furnace, if the number of the components exceeds the maximum furnace loading amount of the brazing furnace, batching is carried out according to actual conditions, then vacuum brazing is carried out according to a temperature curve of selected brazing filler metal, the coil base 4 is lengthened from the laser welding positioning point to two ends along the axis direction in the welding temperature rise process, the coil base 4 is shortened from the two ends to a brazing welding seam in the welding temperature reduction process, and the relative position change of the coil base 4 and the outer cylinder 3 before and after brazing can be ensured in a small range; 10) and (4) performing size spot check: according to the relevant size requirement of the process maturity, the three-coordinate measurement is generally carried out by sampling 10-20% of each batch, and the measurement can be carried out without carrying out measurement after the process is stable, and the verification is carried out in the subsequent product processing process.
In order to improve the precision of each relevant dimension after laser welding positioning of the assembly, the machining precision of each tool needs to be improved, the fit clearance between each tool and the part to be welded is required to be as small as possible, the tool is generally leveled according to the existing numerical control machine, the distance between every two opposite limiting planes 81 on the positioning core shaft 8 is required according to the assembly, the distance dimensional tolerance is +/-0.005 mm, and the symmetry degree is not more than 0.005 mm. The size of the outer circle of the positioning mandrel 8 matched with the inner circle of the outer cylinder 3 is controlled according to the reduction of 0.005mm of the lower limit of the diameter of the inner hole of the outer cylinder 3. The heat dissipation block 5 is cylindrical, the gap between the excircle of the heat dissipation block and the inner hole of the coil holder 4 is controlled within 0.02mm, and the heat dissipation block 5 with a plurality of specifications and sizes needs to be processed and selected according to actual conditions due to the fact that the heat dissipation block has processing errors, so that the best heat dissipation effect is ensured by laser welding positioning.
The above-mentioned embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the same, and not to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the scope of the present invention. The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (10)
1. A laser welding location frock for vibration section of thick bamboo pressure sensor subassembly course of working, its characterized in that: the tool comprises a compression nut (2) and an extrusion cushion block (7) which are respectively arranged at two ends of an outer barrel (3), the outer barrel (3) is arranged between the compression nut (2) and the extrusion cushion block (7) in a pressing way, a positioning core shaft (8) extends into the outer barrel (3) through an inner hole which is arranged on the extrusion cushion block (7) and is matched with the inner diameter of the outer barrel (3), the end part of the positioning core shaft (8) is in threaded connection with the compression nut (2), the coil holes of the positioning core shaft (8) corresponding to the outer cylinder (3) are all provided with a limiting plane (81) facing the coil holes, one end of the heat dissipation block (5) is sleeved with the coil seat (4) and extends into the coil holes, the top end of the jacking screw (6) is propped against the other end of the heat dissipation block (5), and the jacking screw (6) and the corresponding coil hole are arranged in the same axial direction, and the jacking screw (6) is arranged in the guide mechanism (1) with the guide hole in a rotating manner.
2. The laser welding positioning tool for the machining process of the vibrating cylinder pressure sensor assembly according to claim 1, wherein the laser welding positioning tool comprises: the guide mechanism (1) is an arc-shaped clamp, threaded holes are coaxially formed in the two ends of the guide mechanism (1), the two ends of the guide mechanism (1) extend to the outer sides of the outer cylinder (3) and the two opposite side coil holes respectively, and jacking screws (6) corresponding to heat dissipation blocks (5) in the coil holes on the two opposite sides are rotatably arranged in the threaded holes in the two ends of the guide mechanism (1) respectively.
3. The laser welding positioning tool for the machining process of the vibrating cylinder pressure sensor assembly according to claim 1, wherein the laser welding positioning tool comprises: the inner hole of the extrusion cushion block (7) is a stepped hole, the positioning mandrel (8) is a stepped shaft, the other end of the positioning mandrel (8) is a large-diameter end, and the other end of the positioning mandrel (8) is clamped in the inner hole of the extrusion cushion block (7).
4. The laser welding positioning tool for the machining process of the vibrating cylinder pressure sensor assembly according to claim 1, wherein the laser welding positioning tool comprises: the positioning mandrel (8) is provided with four limiting planes (81) which are opposite to each other in pairs and are symmetrical by taking the axis of the positioning mandrel (8) as a symmetry axis.
5. The laser welding positioning tool for the machining process of the vibrating cylinder pressure sensor assembly according to claim 4, wherein the laser welding positioning tool comprises: the distance tolerance between every two opposite limiting planes (81) on the positioning mandrel (8) is +/-0.005 mm, and the symmetry degree is not more than 0.005 mm; the inner hole of the extrusion cushion block (7) is a two-stage stepped hole with a small upper part and a large lower part, and the matching length of the hole with the smaller inner diameter and the positioning mandrel (8) is 5-10 mm; the extrusion cushion block (7) and the positioning mandrel (8) are coaxially arranged, and the gap between the inner hole of the extrusion cushion block (7) and the outer circle of the positioning mandrel (8) is not more than 0.01 mm.
6. The laser welding positioning tool for the machining process of the vibrating cylinder pressure sensor assembly according to claim 1, wherein the laser welding positioning tool comprises: the heat dissipation block (5) is made of copper.
7. The laser welding positioning tool for the machining process of the vibrating cylinder pressure sensor assembly according to claim 1, wherein the laser welding positioning tool comprises: the hardness of the positioning core shaft (8) is HRC 40-HRC 60.
8. The process for machining by using the laser welding positioning tool for the vibrating cylinder pressure sensor assembly as claimed in any one of claims 1 to 7 is characterized by comprising the following steps of:
1) assembling: assembling an extrusion cushion block (7) on a positioning mandrel (8), assembling an outer cylinder (3) on the positioning mandrel (8), fixing the outer cylinder (3), the extrusion cushion block (7) and the positioning mandrel (8) by using a compression nut (2), arranging 2 coil bases (4) into two symmetrical holes of the outer cylinder (3), arranging a radiating block (5) in the coil base (4), screwing a puller screw (6) into a thread of a guide mechanism (1), and tightly jacking the radiating block (5) by using the guide mechanism (1) and the puller screw (6) to enable the coil bases (4) to be tightly attached to the positioning mandrel (8); 2) laser welding and positioning: performing laser welding positioning by using a pulse laser welding machine, wherein an inert gas is used for protecting welding seams in the positioning process, and 3-4 spot welding positions are uniformly distributed along each intersecting line welding seam; 3) and (3) second positioning: taking down the guide mechanism (1) and the heat dissipation block, and repeating the steps 1) and 2) to position the other two coil bases (4) by laser welding; 4) cleaning: wiping off metal dust/steam near the positioning point by using absorbent cotton dipped with alcohol; 5) disassembling: taking down the guide mechanism (1), the jacking screw (6) and the heat dissipation block (5), taking down the compression nut (2), taking down the positioned component from the positioning mandrel (8), and pressing out the component from the positioning mandrel (8) by using a hand press according to needs; 6) checking the size of a first workpiece: checking whether the size of the assembly after the first piece is positioned meets related requirements by using a three-coordinate or projection detector; 7) batch positioning: after the size of the first component meets the requirement, carrying out laser welding positioning on the whole batch of components according to the requirements 1) to 5); 8) solder coating: uniformly coating a paste nickel-based brazing filler metal at the position of a positioned welding seam of the assembly, wherein the brazing filler metal is required to completely cover the welding seam; 9) vacuum brazing: and (3) putting the components which are subjected to laser welding positioning and solder coating into a vacuum brazing furnace, and if the number of the components exceeds the maximum furnace loading amount of the brazing furnace, carrying out batch-wise operation according to the actual condition, and then carrying out vacuum brazing according to the temperature curve of the selected brazing filler metal.
9. The process of manufacturing a vibrating cylinder pressure sensor assembly as set forth in claim 8, wherein: inert gases used in the positioning process in the step 2) comprise argon and nitrogen.
10. The process of manufacturing a vibrating cylinder pressure sensor assembly as set forth in claim 8, wherein: the energy of a single pulse in the step 2) is controlled to be 4J-6J.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010264869.2A CN111347181A (en) | 2020-04-07 | 2020-04-07 | Laser welding positioning tool for vibrating cylinder pressure sensor assembly and machining process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010264869.2A CN111347181A (en) | 2020-04-07 | 2020-04-07 | Laser welding positioning tool for vibrating cylinder pressure sensor assembly and machining process |
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| CN111347181A true CN111347181A (en) | 2020-06-30 |
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| CN202010264869.2A Pending CN111347181A (en) | 2020-04-07 | 2020-04-07 | Laser welding positioning tool for vibrating cylinder pressure sensor assembly and machining process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115673583A (en) * | 2022-11-01 | 2023-02-03 | 成都科力深传感技术有限公司 | High-precision stress-free welding method based on laser welding and brazing |
-
2020
- 2020-04-07 CN CN202010264869.2A patent/CN111347181A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115673583A (en) * | 2022-11-01 | 2023-02-03 | 成都科力深传感技术有限公司 | High-precision stress-free welding method based on laser welding and brazing |
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