CN112091545A - Stainless steel fuel oil high-pressure oil pipe and manufacturing process thereof - Google Patents
Stainless steel fuel oil high-pressure oil pipe and manufacturing process thereof Download PDFInfo
- Publication number
- CN112091545A CN112091545A CN202010970489.0A CN202010970489A CN112091545A CN 112091545 A CN112091545 A CN 112091545A CN 202010970489 A CN202010970489 A CN 202010970489A CN 112091545 A CN112091545 A CN 112091545A
- Authority
- CN
- China
- Prior art keywords
- stainless steel
- joint
- pressure oil
- pipe
- oil pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 202
- 239000010935 stainless steel Substances 0.000 title claims abstract description 201
- 239000003921 oil Substances 0.000 title claims abstract description 120
- 239000000295 fuel oil Substances 0.000 title claims abstract description 53
- 238000004519 manufacturing process Methods 0.000 title claims description 21
- 238000007789 sealing Methods 0.000 claims description 121
- 239000000446 fuel Substances 0.000 claims description 53
- 238000000137 annealing Methods 0.000 claims description 40
- 238000005498 polishing Methods 0.000 claims description 25
- 238000012545 processing Methods 0.000 claims description 24
- 238000005452 bending Methods 0.000 claims description 23
- 238000004140 cleaning Methods 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 8
- 238000005520 cutting process Methods 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 5
- 238000007689 inspection Methods 0.000 claims description 5
- 238000009987 spinning Methods 0.000 claims description 5
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 description 11
- 238000003754 machining Methods 0.000 description 6
- 239000000428 dust Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000005482 strain hardening Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 229910001039 duplex stainless steel Inorganic materials 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000010147 laser engraving Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/004—Joints; Sealings
- F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention provides a stainless steel fuel oil high-pressure oil pipe, which comprises a body and two joints, and is characterized in that: the body both ends are first tip and second tip respectively, and two joints are first joint and second joint respectively, the first tip and the first joint integrated into one piece of body, the second tip and the second joint integrated into one piece of body. The invention solves the problems in the prior art that: how to enable the stainless steel fuel oil high-pressure oil pipe to be connected with the corresponding joints with different hardness at two ends in a seamless and leakage-free manner.
Description
Technical Field
The invention relates to the technical field of fuel oil high-pressure oil pipes for connecting a high-pressure oil pump and a high-pressure oil rail in a direct injection engine, in particular to a stainless steel fuel oil high-pressure oil pipe and a manufacturing process thereof.
Background
Firstly, the stainless steel fuel oil high-pressure oil pipe needs to be connected with a corresponding joint in the using process and has no gap between the stainless steel fuel oil high-pressure oil pipe and the corresponding joint, so that oil leakage is avoided, and how to enable the stainless steel fuel oil high-pressure oil pipe to be connected with the corresponding joint in a seamless mode becomes a problem to be solved.
In addition, the existing fuel oil high-pressure oil pipe manufacturing process has two types, one type is that the high-pressure oil pipe consisting of the oil pipe, the machining sealing joint, the copper ring and the nut is integrally brazed at high temperature, so that the sealing joints at the two ends of the high-pressure oil pipe are soft in hardness. The reliability of the fitting seal of the soft sealing joint and the soft pipe joint is lowered; meanwhile, the nut is subjected to high-temperature annealing in the technical process, the nut is softened, the locking performance of the nut is greatly reduced, and the reliability of oil pipe sealing is greatly reduced; and in addition, the sealing joints at two ends of the high-pressure oil pipe are subjected to cold forming, the hardness of the sealing joints is greatly improved due to the cold work hardening effect, the sealing joints cannot be effectively sealed and matched with the hard pipe joints of the hand pieces to yield, and the sealing reliability is reduced. Both of these approaches present a significant risk to the tubing seal.
Therefore, how to meet the sealing requirement matched with a soft counter-hand pipe joint and the sealing requirement matched with a hard counter-hand pipe joint when the same fuel high-pressure oil pipe is used becomes a problem to be solved urgently. In addition, how to avoid the nut from being subjected to high-temperature annealing in the technical process, the locking performance of the nut is prevented from being greatly reduced, and the problem of greatly reducing the reliability of oil pipe sealing also needs to be solved.
Disclosure of Invention
The invention aims to provide a stainless steel fuel oil high-pressure oil pipe and a manufacturing process thereof, which mainly solve the problems in the prior art that: how to enable the stainless steel fuel oil high-pressure oil pipe to be in seamless connection with the corresponding joint; the second problem is that: how to use the same fuel oil high-pressure oil pipe, can meet the sealing requirement matched with the soft counterpart pipe joint, can also meet the problem of the sealing requirement matched with the hard counterpart pipe joint at the same time; the third problem is that: how to avoid the problem that the nut is subjected to high-temperature annealing in the process, the locking performance of the nut is greatly reduced, and the sealing reliability of the oil pipe is greatly reduced, and the stainless steel fuel oil high-pressure oil pipe and the manufacturing process thereof are provided.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a stainless steel fuel oil high pressure fuel pipe, includes body and two joints, its characterized in that: the body both ends are first tip and second tip respectively, and two joints are first joint and second joint respectively, the first tip and the first joint integrated into one piece of body, the second tip and the second joint integrated into one piece of body.
Further, the inner part of the first joint and/or the inner part of the second joint are hollow parts in cylindrical shapes, and the outer part of the first joint and/or the outer part of the second joint are in spherical or double-spherical structures;
or the inner part of the first joint and/or the inner part of the second joint are hollow parts formed by spherical surfaces or double spherical surfaces, and the outer part of the first joint and/or the outer part of the second joint are in spherical surfaces or double spherical structures.
Further, the body is bent into at least three bending parts.
Furthermore, the bending angle of at least one bending part close to the middle part of the body ranges from 90 degrees to 170 degrees; the hardness of the first joint is different from that of the second joint; the body is sleeved with two back-to-back nuts.
Furthermore, the first end part of one end of the body and the first joint are soft sealing joints formed by cold forming and then high-temperature annealing; the second end part of the other end of the body and the second joint are hard sealing joints formed through cold forming.
Further, the hardness value of the soft sealing joint of the stainless steel fuel high-pressure oil pipe is between 110 and 230HV 1; the hardness value of the hard sealing joint of the stainless steel fuel high-pressure oil pipe is between 240 and 440HV 1.
Furthermore, the stainless steel fuel high-pressure oil pipe is also sleeved with at least two nuts, and the nuts are positioned on the stainless steel fuel high-pressure oil pipe between the soft sealing joint and the hard sealing joint; the nut is not subjected to high temperature annealing treatment.
A manufacturing process of a stainless steel fuel high-pressure oil pipe relates to the stainless steel fuel high-pressure oil pipe, and is characterized by comprising the following steps:
step S1: cutting off the stainless steel straight pipe;
step S2: turning the outer diameters of two ends;
step S3: chamfering the two ends;
step S4: cleaning for the first time;
step S5: cold forming a port at one end of the stainless steel straight pipe;
step S6: polishing for the first time;
step S7: second cleaning
Step S8: annealing at high temperature;
step S9: marking for the first time;
step S10: two nuts are sleeved;
step S11: a port at the other end of the cold-formed stainless steel straight pipe;
step S12: polishing for the second time;
step S13: cleaning for the third time;
step S14: marking for the second time;
step S15: detecting the size of the sealing joint;
step S16: bending the pipe;
step S17: detecting the position degree and the tube shape of the sealing joint;
step S18: performing appearance inspection;
step S19: and (7) packaging and warehousing.
Further, the step S2 specifically includes the following steps:
step S2-1: providing a turning device;
step S2-2: and (3) placing the stainless steel straight pipe after material breakage into turning equipment, and precisely turning the outer diameters of two ends of the stainless steel straight pipe through the turning equipment, wherein the length of the outer diameter is 2-20mm, and the surface precision of the outer diameter is Rz0.8-10.
Further, the step S3 specifically includes the following steps:
step S3-1: providing a processing device for chamfering two end ports of a stainless steel straight pipe;
step S3-2: the turned stainless steel straight pipe is placed into chamfering processing equipment, chamfering is carried out on the inner diameter and the outer diameter of pipe orifices at two ends of the stainless steel straight pipe through the chamfering processing equipment, the outer diameter of the pipe orifices is subjected to chamfering or chamfering, and the inner diameter of the pipe orifices is subjected to chamfering.
Further, the step S5 specifically includes the following steps:
step S5-1: providing cold forming equipment for cold forming a stainless steel straight pipe port;
step S5-2: and (3) carrying out cold forming processing on the port at one end of the stainless steel straight pipe through cold forming equipment.
Further, the step S6 specifically includes the following steps:
step S6-1: and (3) polishing the stainless steel straight pipe sealing joint (actually, the sealing joint which corresponds to one end of the soft joint and is not annealed at high temperature) with one cold-formed end for the first time, and polishing by adopting a grinding wheel to improve the surface precision to Rz0.8-10, or polishing by adopting mechanical spinning to improve the surface precision to Rz0.8-10.
Further, the step S8 specifically includes the following steps:
step S8-1: providing a high temperature annealing device;
step S8-2: and (3) carrying out high-temperature annealing on the stainless steel straight pipe with one end subjected to cold forming and polishing.
The utility model provides a stainless steel fuel high pressure oil pipe which characterized in that: one end sealing joint of the stainless steel fuel high-pressure oil pipe is a soft sealing joint which is subjected to cold forming and then annealed at high temperature, and the other end sealing joint of the stainless steel fuel high-pressure oil pipe is a hard sealing joint which is subjected to cold forming.
A manufacturing process of a stainless steel fuel high-pressure oil pipe relates to the stainless steel fuel high-pressure oil pipe, and is characterized by comprising the following steps:
step S1: cutting off the raw material stainless steel straight pipe, and performing primary cold forming processing on a port at one end of the stainless steel straight pipe;
step S2: carrying out high-temperature annealing on a port at one end of the stainless steel straight pipe subjected to the first cold forming processing to form a soft sealing joint;
step S3: two back-to-back nuts are sleeved in the stainless steel straight pipe through the port of the other unprocessed end of the stainless steel straight pipe;
step S4: cold forming the other unprocessed end port of the stainless steel straight pipe to form a hard sealing joint;
step S5: and bending the stainless steel straight pipe with the processed ports at the two ends to form the stainless steel fuel oil high-pressure oil pipe with the soft sealing joint at one end and the hard sealing joint at the other end.
In view of the technical characteristics, the invention has the following beneficial effects:
1. according to the stainless steel fuel oil high-pressure oil pipe, the first end part and the first joint are integrally formed to form sealing connection, and the second end part and the second joint are integrally formed to form sealing connection, so that the stainless steel fuel oil high-pressure oil pipe is connected with the corresponding joint in a seamless mode, and oil leakage is avoided.
2. According to the stainless steel fuel oil high-pressure oil pipe, the inside of the first joint is a cylindrical hollow part, and the outside of the first joint is of a spherical surface or double-spherical surface structure; this design enhances the strength of the first joint. I.e. the problem of how to improve the strength of the first joint is solved here.
3. The body of the stainless steel fuel high-pressure oil pipe is bent into at least three bending parts. Wherein the bending angle of at least one bending part close to the middle part of the body ranges from 90 degrees to 170 degrees; the design ensures that the body of the stainless steel fuel high-pressure oil pipe has more stretching flexibility, reduces the rigidity of the body, ensures the axial force of the nut, and further ensures the sealing reliability of the sealing structure formed between the body and the counterpart piece through the nut.
4. According to the stainless steel fuel oil high-pressure oil pipe, the hardness of the first joint and the hardness of the second joint are different, so that when the same fuel oil high-pressure oil pipe is used, the sealing requirement matched with a soft counterpart pipe joint can be met, and meanwhile, the sealing requirement matched with a hard counterpart pipe joint can also be met.
5. According to the stainless steel fuel oil high-pressure oil pipe with the soft sealing joint at one end and the hard sealing joint at the other end, the soft sealing joint can be matched with a harder opponent pipe joint, the hard sealing joint can be matched with an opponent pipe joint, meanwhile, the nut is not subjected to annealing treatment, good screwing and sealing reliability is kept, the soft sealing joint is matched with the actual hardness condition of the opponent pipe joint of the fuel oil high-pressure oil pipe, and the sealing reliability is improved through soft-hard matching.
6. The stainless steel fuel oil high-pressure oil pipe and the manufacturing process thereof economically and reliably carry out high-temperature annealing on one end of the stainless steel fuel oil high-pressure oil pipe, avoid the annealing of a nut and a cold-formed sealing joint at the other end, and ensure that the stainless steel fuel oil high-pressure oil pipe can be matched with the reliable assembly of the hand piece pipe joint with different hardness.
7. According to the manufacturing process of the stainless steel fuel high-pressure oil pipe, the outer surfaces of the two ends of the straight pipe are turned, so that surface defects such as strain indentation and collision are eliminated, and the surface roughness is improved; the high-temperature annealing is carried out on the sealing joint at one end, so that the surface hardness of the sealing joint is reduced, and the sealing reliability of the hard hand piece pipe joint is improved; the original locking and sealing functions of the nut are kept by avoiding high-temperature annealing of the nut; by cold forming the sealing joint at the other end, higher rigidity is kept, and reliable sealing can be performed with the soft hand piece pipe joint.
Drawings
FIG. 1 is a schematic structural diagram of a stainless steel fuel oil high-pressure oil pipe in example 1.
FIG. 2 is a schematic structural diagram of a stainless steel fuel oil high-pressure oil pipe in example 2.
FIG. 3 is a schematic structural view of a stainless steel fuel oil high-pressure oil pipe according to example 3.
FIG. 4 is a flow chart of the manufacturing process of the stainless steel fuel oil high-pressure oil pipe in example 4.
In the figure: 1 is a stainless steel fuel oil high-pressure oil pipe body; 1-1 is a first end; 1-2 is a second end; 2 is a soft sealing joint; 3 is a hard sealing joint; 4 is a bending part; 5 is a nut; 8 is a first joint; and 9 is a second joint.
Detailed Description
The invention will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Referring to fig. 1, an embodiment 1, this embodiment 1 provides a stainless steel fuel oil high-pressure oil pipe, including a body 1 and two joints, and its characteristics are: the two ends of the body 1 are respectively a first end part 1-1 and a second end part 1-2, the two joints are respectively a first joint 8 and a second joint 9, the first end part 1-1 of the body 1 and the first joint 8 are integrally formed, and the second end part 1-2 of the body 1 and the second joint 9 are integrally formed.
The inner part of the first joint 8 and/or the inner part of the second joint 9 are hollow parts in cylindrical shapes, and the outer part of the first joint 8 and/or the outer part of the second joint 9 are in spherical or double-spherical structures; or the inside of the first joint 8 and/or the inside of the second joint 9 are hollow parts formed by spherical surfaces or double spherical surfaces, and the outside of the first joint 8 and/or the outside of the second joint 9 are in a spherical surface or double spherical surface structure.
In embodiment 1, it is preferable that the outer portion of the first joint 8 and the outer portion of the second joint 9 are spherical surfaces, and the inner portion of the first joint 8 and the inner portion of the second joint 9 are hollow portions formed by spherical surfaces, so that the spherical surface has a large area, and is easy to process and measure, and has high quality reliability.
Alternatively, the shape of the soft sealing joint 2 and/or the hard sealing joint 3 of the stainless steel fuel high-pressure oil pipe is a sphere type or a cone type or a double sphere type or a cylinder type. The sealing joint shapes of the soft sealing joint 2 and/or the hard sealing joint 3 include, but are not limited to, a sphere type, a cone type, a double sphere type, and a cylinder type, and their respective geometric combinations.
The body 1 is bent into at least three bending parts 4. The bending angle of at least one bending part 4 close to the middle part of the body 1 ranges from 90 degrees to 170 degrees; the bending radius of the bending part 4 is more than 5mm, so that the actual assembly requirement is met.
The hardness of the first joint 8 is different from that of the second joint 9, the soft sealing joint 2 formed by the first joint 8 is included, and the hard sealing joint 3 formed by the second joint 9 is included; therefore, the stainless steel fuel oil high-pressure oil pipe body 11 can be matched with the hand piece pipe joints with different hardness for reliable assembly.
Two back-to-back nuts 5 are sleeved on the body 1. The nut 5 is positioned between the soft sealing joint 2 and the hard sealing joint 3 on the stainless steel fuel high-pressure oil pipe;
referring to fig. 2, embodiment 2 specifically, embodiment 2 provides a stainless steel fuel oil high pressure oil pipe, and embodiment 2 is different from embodiment 1 in that the outer portion of the first joint 8 and the outer portion of the second joint 9 are spherical surfaces, and the inner portion of the first joint 8 and the inner portion of the second joint 9 are hollow portions in cylindrical shapes, so that the outer spherical surfaces of the two joints are designed to be large in area, easy to machine and measure, and good in quality reliability. Meanwhile, the interiors of the two joints are cylindrical hollow parts, so that the strength of the two joints can be increased.
Referring to fig. 3, embodiment 3 is specific, and embodiment 3 provides a stainless steel fuel oil high-pressure oil pipe, and embodiment 2 is different from the previous embodiments in that the inside of the first joint 8 and/or the inside of the second joint 9 are hollow portions formed by double spherical surfaces, and the outside of the first joint 8 and/or the outside of the second joint 9 are of a double spherical surface structure.
Referring to fig. 4, an embodiment 4, this embodiment 4 provides a manufacturing process of a stainless steel fuel high-pressure oil pipe, which relates to the stainless steel fuel high-pressure oil pipe described in any one of embodiments 1 to 3, and is characterized by comprising the following steps:
step S1: cutting off the stainless steel straight pipe; the step S1 specifically includes the following steps:
step S1-1: providing machining equipment and chip removal tool equipment;
step S1-2: performing machining material breaking and chip removal on the raw material stainless steel straight pipe through machining equipment and chip removal tool equipment; raw materials stainless steel straight tube, the straight tube is not revised to the supplied materials that also generally length is longer, need carry out the material breakage to it and handle, be about to raw materials stainless steel straight tube and carry out the material breakage according to the required length of product and handle, machining equipment at this moment adopts the chip removal frock to carry out the chip removal processing when carrying out the material breakage, is to avoid the metal fillings scratch straight tube surface that raw materials stainless steel straight tube material breakage in-process produced, influences the machining effect of follow-up manufacturing procedure.
Step S2: turning the outer diameters of two ends; the step S2 specifically includes the following steps:
step S2-1: providing a turning device;
step S2-2: placing the stainless steel straight pipe after material breaking into turning equipment, and precisely turning the outer diameters of two ends of the stainless steel straight pipe through the turning equipment, wherein the length of the outer diameter is 2-20mm, and the surface precision of the outer diameter is Rz0.8-10; the outer diameters of the two ends are turned to improve the surface precision of the outer diameters of the two ends.
Step S3: chamfering the two ends; the step S3 specifically includes the following steps:
step S3-1: providing a processing device for chamfering two end ports of a stainless steel straight pipe;
step S3-2: placing the turned stainless steel straight pipe into chamfering processing equipment, chamfering the inner and outer diameters of pipe orifices at two ends of the stainless steel straight pipe through the chamfering processing equipment, chamfering or squaring the outer diameter of the pipe orifice, and squaring the inner diameter of the pipe orifice; for example, the outer diameter is rounded at R0.1-R5 or at a chamfer angle of C0.1-C5, and the inner diameter is chamfered at a chamfer angle of C0.1-C5. Preparing for the subsequent cold forming processing of the two ends of the stainless steel straight pipe.
Step S4: cleaning for the first time; the step S4 specifically includes the following steps:
step S4-1: and (3) carrying out primary cleaning for removing oil stains and dust on the chamfered stainless steel straight pipe. The first cleaning comprises the step of cleaning the whole inside and the outside of the stainless steel straight pipe, particularly cleaning the inner diameter and the outer diameter of pipe openings at two ends of the stainless steel straight pipe, removing oil stains and dust, and mainly preparing for subsequent cold forming and first polishing.
Step S5: cold forming a port at one end of the stainless steel straight pipe; the step S5 specifically includes the following steps:
step S5-1: providing cold forming equipment for cold forming a stainless steel straight pipe port; at the moment, the stainless steel straight pipe can be clamped by the tool in a rotating mode, and the cold forming processing of the end of the stainless steel straight pipe is carried out by the die.
Step S5-2: carrying out cold forming processing on a port at one end of the stainless steel straight pipe through cold forming equipment; the port of the end of the stainless steel straight pipe is placed into cold forming equipment, the port of the end of the stainless steel straight pipe is subjected to cold forming by a die through clamping of a tool, the cold forming is also called as first cold forming of one end of the stainless steel straight pipe, and the port of the stainless steel straight pipe subjected to cold forming is prepared for subsequent high-temperature annealing. The forming step is within 1 step or 5 steps according to the size and the shape of the sealing joint.
Step S6: polishing for the first time; the step S6 specifically includes the following steps:
step S6-1: and (3) polishing the stainless steel straight pipe sealing joint (actually, the sealing joint which corresponds to one end of the soft joint and is not annealed at high temperature) with one cold-formed end for the first time, and polishing by adopting a grinding wheel to improve the surface precision to Rz0.8-10, or polishing by adopting mechanical spinning to improve the surface precision to Rz0.8-10. According to the size and the shape of the sealing joint, the steps of grinding wheel polishing and mechanical spinning polishing are 1 step or within 5 steps.
Step S7: the step S7 of cleaning for the second time specifically includes the following steps:
step S7-1: and carrying out secondary cleaning for removing oil stains and dust on the stainless steel straight pipe subjected to primary polishing. And the second cleaning comprises cleaning the whole inside and outside of the stainless steel straight pipe, particularly cleaning the inner diameter and the outer diameter of pipe openings at two ends of the stainless steel straight pipe, removing oil stains and dust, and mainly preparing for subsequent high-temperature annealing.
Step S8: annealing at high temperature; the step S8 specifically includes the following steps:
step S8-1: providing a high temperature annealing device;
step S8-2: carrying out integral high-temperature annealing on the stainless steel straight pipe with one end which is subjected to cold forming and polishing; during high-temperature annealing, air, reducing gas, hydrogen, nitrogen or ammonia decomposition gas can be used for high-temperature annealing, a mesh belt tunnel furnace or induction equipment can be used for annealing, the annealing temperature of the workpiece is 950-1190 ℃, and the time is 1-10 min. The temperature of each heating area of the muffle of the tunnel furnace is set to be 800-1300 ℃, the speed of a mesh belt is 100-500 mm/min, and the atmosphere dew point is controlled to be below five ℃ below zero when reducing gas, hydrogen, nitrogen or ammonia decomposition gas is used.
Step S9: marking for the first time; the step S9 specifically includes the following steps:
step S9-1: and marking the stainless steel straight pipe subjected to high-temperature annealing for the first time, namely, marking the error-proofing mark. The stainless steel tube is marked, such as by dotting, on its body near the end where it has been annealed at high temperature.
Step S10: two nuts 5 are sleeved; the step S10 specifically includes the following steps:
step S10-1: two nuts 5 are selected to be sleeved in from the other unformed end of the stainless steel straight pipe back to complete the sleeve connection of the nuts 5 and the stainless steel straight pipe, the two nuts are sleeved on the stainless steel straight pipe back to back, so that the operation efficiency is high, and the matching directions of the nuts and the two ends of the stainless steel straight pipe cannot be wrong. At this moment, the two nuts 5 are sleeved on the stainless steel straight pipe, the stainless steel straight pipe is subjected to cold forming and high-temperature annealing, so that the nuts 5 can be completely prevented from being subjected to high-temperature annealing, namely the two nuts 5 do not carry out high-temperature annealing together with the stainless steel straight pipe, and further the hardness and hardness of the nuts 5 can not be influenced, the nuts 5 can keep original good hardness, the fastening effect of the nuts 5 on workpieces (namely the two ends of the stainless steel straight pipe) is better, and the fastening and fixing effect of the two ends of the stainless steel fuel high-pressure oil pipe and the corresponding parts is better.
Step S11: a port at the other end of the cold-formed stainless steel straight pipe; the step S11 specifically includes the following steps:
step S11-1: and putting the port at the other end of the stainless steel straight pipe into cold forming equipment, clamping by a tool, and simultaneously carrying out cold forming processing on the other end of the stainless steel straight pipe by using a mould to form a hard sealing joint 3. The other end of the stainless steel straight pipe at this moment is the end which is not annealed at high temperature, actually is the end of the stainless steel straight pipe which is not processed, and two nuts 5 are sleeved into the end of the stainless steel straight pipe, and the forming process steps are 1 step or within 5 steps.
Step S12: polishing for the second time; the step S12 specifically includes the following steps:
step S112-1: and (3) polishing the hard sealing joint 3 at the other end port of the stainless steel straight pipe for the second time, wherein the surface precision is improved to Rz0.8-10 by adopting grinding wheel polishing, or the surface precision is improved to Rz0.8-10 by adopting mechanical spinning polishing, and the stainless steel straight pipe is processed into the stainless steel fuel oil high-pressure oil pipe. One end of the stainless steel fuel oil high-pressure oil pipe formed at the moment is a soft sealing joint 2 subjected to cold forming and high-temperature annealing, the other end of the stainless steel fuel oil high-pressure oil pipe is a hard sealing joint 3 only subjected to cold forming, and the hard sealing joint 3 is not subjected to the high-temperature annealing process.
Step S13: cleaning for the third time; the step S13 specifically includes the following steps:
step S13-1: and (3) performing cold forming processing on the port at the other end of the stainless steel straight pipe to form the stainless steel straight pipe of the hard seal joint 3 (namely the stainless steel fuel oil high-pressure oil pipe which is processed by the hard seal joint 3), and performing third cleaning, wherein the third cleaning comprises cleaning the whole inside and outside of the stainless steel straight pipe, removing oil stains and dust, and ensuring the cleanliness of the product, especially in the pipe.
Step S14: marking for the second time; the step S14 specifically includes the following steps:
step S14-1: and marking for the second time on the nut 5 or the pipe body of a stainless steel straight pipe (namely a stainless steel fuel oil high-pressure oil pipe) for product tracing identification. For example, two-dimensional code or plain code laser engraving identification can be carried out on the nut 5 or the stainless steel straight pipe body, and an independent ID code is given to each stainless steel straight pipe or stainless steel fuel oil high-pressure oil pipe for product tracing.
Step S15: detecting the size of the sealing joint; the step S15 specifically includes the following steps:
step S15-1: and (3) carrying out 100% geometric dimension and form and position tolerance detection on the soft sealing joint 2 and the hard sealing joint 3 at two ends of the stainless steel fuel high-pressure oil pipe. For example, the specific items detected are: the ball diameter and tolerance of the sealing surface of the soft sealing joint 2 and/or the hard sealing joint 3, the profile of the sealing surface, the ball diameter and tolerance of the compression surface, and the like.
Step S16: bending the pipe; the step S16 specifically includes the following steps:
step S16-1: and bending the stainless steel fuel high-pressure oil pipe to form at least one bent part 4, wherein the bending radius of the bent part 4 is more than 5 mm. The bent portion 4 is for meeting the requirements of practical applications, such as product installation requirements.
Step S17: detecting the position degree and the tube shape of the sealing joint; the step S17 specifically includes the following steps:
step S17-1: and the bent stainless steel fuel high-pressure oil pipe is detected by using mechanical detection tool equipment or optical imaging detection tool equipment, and the respective position degrees of the soft sealing joint 2 and the hard sealing joint 3 and the pipe type of the stainless steel fuel high-pressure oil pipe are detected. For example, the purpose of the detection is not to judge whether the processed stainless steel fuel high-pressure oil pipe meets the acceptance requirements.
Step S18: performing appearance inspection; the step S18 specifically includes the following steps:
step S18-1: and (4) carrying out appearance inspection on the stainless steel fuel high-pressure oil pipe by virtue of magnifying glass equipment, and removing defective parts such as flaws and the like. For example, the standard of appearance inspection can be flaw-free, wiredrawing-free, impression-free, pit-free, indentation-free and bump-free.
Step S19: and (7) packaging and warehousing.
The nut 5 is not subjected to high temperature annealing. The two nuts 5 are sleeved into the oil pipe after one end of the stainless steel straight pipe is annealed at high temperature and before the other end of the stainless steel straight pipe is cold-formed, the initial state of the nuts 5 is kept, the high-temperature annealing process is not carried out, and good screwing and sealing reliability is guaranteed.
The hardness value of the soft sealing joint 2 of the stainless steel fuel high-pressure oil pipe is between 110 and 230HV1, including 110HV1 and 230HV 1; the hardness value of the hard sealing joint 3 of the stainless steel fuel high-pressure oil pipe is between 240 and 440HV1, including 240HV1 and 440HV 1. The hardness value of the soft sealing joint 2 and the hardness value of the hard sealing joint 3 are selected to correspond to different austenitic, martensitic and duplex stainless steels.
One end sealing joint of the stainless steel fuel high-pressure oil pipe is a soft sealing joint 2 which is subjected to cold forming and then high-temperature annealing, and the other end sealing joint of the stainless steel fuel high-pressure oil pipe is a hard sealing joint 3 which is subjected to cold forming. At the moment, the sealing joint at one end of the stainless steel fuel high-pressure oil pipe only consists of a stainless steel pipe, the shape of the sealing joint is formed by cold forming, then high-temperature annealing is carried out, the cold hardening effect is eliminated, and the hardness value of the soft sealing joint 2 is reduced. The hard sealing joint 3 at the other end of the stainless steel fuel high-pressure oil pipe only consists of a stainless steel pipe, the shape of the sealing joint is formed by cold forming, the hardness value of the hard sealing joint 3 is improved by cold work hardening, the hard sealing joint is actually formed by cold forming and then annealed at high temperature at the sealing joint at one end of the high-pressure oil pipe, and the other end is formed by cold forming and is not annealed at high temperature. In addition, the stainless steel material used for the stainless steel fuel high-pressure oil pipe comprises all austenite, martensite, ferrite and duplex stainless steel, and the raw material of the stainless steel fuel high-pressure oil pipe is preferably cold-rolled or cold-drawn stainless steel seamless steel pipe. The stainless steel pipe of the stainless steel fuel high-pressure oil pipe has an outer diameter of 4-20 mm and a wall thickness of 0.5-6 mm.
In specific embodiment 5, the stainless steel high-pressure oil pipe for fuel oil provided in this embodiment 5 is the same as the stainless steel high-pressure oil pipe for fuel oil in specific embodiment 1, and only the steps of the manufacturing process of the stainless steel high-pressure oil pipe for fuel oil of this embodiment 5 are simpler, and the method includes the following steps:
step S1: cutting off the raw material stainless steel straight pipe, and performing primary cold forming processing on a port at one end of the stainless steel straight pipe;
step S2: carrying out high-temperature annealing on a port at one end of the stainless steel straight pipe subjected to the first cold forming processing to form a soft sealing joint 2;
step S3: two back-to-back nuts 5 are sleeved in the stainless steel straight pipe through the port of the other unprocessed end;
step S4: performing cold forming processing on the unprocessed other end port of the stainless steel straight pipe to form a hard sealing joint 3;
step S5: and bending the stainless steel straight pipe with the processed ports at the two ends to form the stainless steel fuel oil high-pressure oil pipe with the soft sealing joint 2 at one end and the hard sealing joint 3 at the other end.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (15)
1. The utility model provides a stainless steel fuel oil high pressure fuel pipe, includes body and two joints, its characterized in that: the body both ends are first tip and second tip respectively, and two joints are first joint and second joint respectively, the first tip and the first joint integrated into one piece of body, the second tip and the second joint integrated into one piece of body.
2. The stainless steel fuel high-pressure oil pipe according to claim 1, characterized in that: the inner part of the first joint and/or the inner part of the second joint are cylindrical hollow parts, and the outer part of the first joint and/or the outer part of the second joint are spherical surfaces or double-spherical structures;
or the inner part of the first joint and/or the inner part of the second joint are hollow parts formed by spherical surfaces or double spherical surfaces, and the outer part of the first joint and/or the outer part of the second joint are in spherical surfaces or double spherical structures.
3. The stainless steel fuel high-pressure oil pipe according to claim 2, characterized in that: the body is bent into at least three bending parts.
4. The stainless steel fuel high-pressure oil pipe according to claim 3, characterized in that: the bending angle of at least one bending part close to the middle part of the body ranges from 90 degrees to 170 degrees; the hardness of the first joint is different from that of the second joint; the body is sleeved with two back-to-back nuts.
5. The stainless steel fuel oil high-pressure oil pipe according to any one of claims 1 to 4, characterized in that: the first end part of one end of the body and the first joint are soft sealing joints formed by cold forming and then high-temperature annealing; the second end part of the other end of the body and the second joint are hard sealing joints formed through cold forming.
6. The stainless steel fuel high-pressure oil pipe according to claim 5, characterized in that: the hardness value of the soft sealing joint of the stainless steel fuel high-pressure oil pipe is between 110 and 230HV 1; the hardness value of the hard sealing joint of the stainless steel fuel high-pressure oil pipe is between 240 and 440HV 1.
7. The stainless steel fuel high-pressure oil pipe according to claim 6, characterized in that: the stainless steel fuel high-pressure oil pipe is also sleeved with at least two nuts, and the nuts are positioned on the stainless steel fuel high-pressure oil pipe between the soft sealing joint and the hard sealing joint; the nut is not subjected to high temperature annealing treatment.
8. A manufacturing process of a stainless steel fuel high-pressure oil pipe relates to the stainless steel fuel high-pressure oil pipe according to claim 7, and is characterized by comprising the following steps:
step S1: cutting off the stainless steel straight pipe;
step S2: turning the outer diameters of two ends;
step S3: chamfering the two ends;
step S4: cleaning for the first time;
step S5: cold forming a port at one end of the stainless steel straight pipe;
step S6: polishing for the first time;
step S7: second cleaning
Step S8: annealing at high temperature;
step S9: marking for the first time;
step S10: two nuts are sleeved;
step S11: a port at the other end of the cold-formed stainless steel straight pipe;
step S12: polishing for the second time;
step S13: cleaning for the third time;
step S14: marking for the second time;
step S15: detecting the size of the sealing joint;
step S16: bending the pipe;
step S17: detecting the position degree and the tube shape of the sealing joint;
step S18: performing appearance inspection;
step S19: and (7) packaging and warehousing.
9. The manufacturing process of a stainless steel fuel oil high pressure oil pipe according to claim 8, characterized in that: the step S2 specifically includes the following steps:
step S2-1: providing a turning device;
step S2-2: and (3) placing the stainless steel straight pipe after material breakage into turning equipment, and precisely turning the outer diameters of two ends of the stainless steel straight pipe through the turning equipment, wherein the length of the outer diameter is 2-20mm, and the surface precision of the outer diameter is Rz0.8-10.
10. The manufacturing process of the stainless steel fuel oil high-pressure oil pipe according to claim 9, characterized in that: the step S3 specifically includes the following steps:
step S3-1: providing a processing device for chamfering two end ports of a stainless steel straight pipe;
step S3-2: the turned stainless steel straight pipe is placed into chamfering processing equipment, chamfering is carried out on the inner diameter and the outer diameter of pipe orifices at two ends of the stainless steel straight pipe through the chamfering processing equipment, the outer diameter of the pipe orifices is subjected to chamfering or chamfering, and the inner diameter of the pipe orifices is subjected to chamfering.
11. The manufacturing process of a stainless steel fuel oil high pressure oil pipe according to claim 10, characterized in that: the step S5 specifically includes the following steps:
step S5-1: providing cold forming equipment for cold forming a stainless steel straight pipe port;
step S5-2: and (3) carrying out cold forming processing on the port at one end of the stainless steel straight pipe through cold forming equipment.
12. The manufacturing process of a stainless steel fuel oil high pressure oil pipe according to claim 11, wherein: the step S6 specifically includes the following steps:
step S6-1: and (3) polishing the stainless steel straight pipe sealing joint (actually, the sealing joint which corresponds to one end of the soft joint and is not annealed at high temperature) with one cold-formed end for the first time, and polishing by adopting a grinding wheel to improve the surface precision to Rz0.8-10, or polishing by adopting mechanical spinning to improve the surface precision to Rz0.8-10.
13. The manufacturing process of a stainless steel fuel oil high pressure oil pipe according to claim 12, wherein: the step S8 specifically includes the following steps:
step S8-1: providing a high temperature annealing device;
step S8-2: and (3) carrying out high-temperature annealing on the stainless steel straight pipe with one end subjected to cold forming and polishing.
14. The utility model provides a stainless steel fuel high pressure oil pipe which characterized in that: one end sealing joint of the stainless steel fuel high-pressure oil pipe is a soft sealing joint which is subjected to cold forming and then annealed at high temperature, and the other end sealing joint of the stainless steel fuel high-pressure oil pipe is a hard sealing joint which is subjected to cold forming.
15. A manufacturing process of a stainless steel fuel high-pressure oil pipe, which relates to the stainless steel fuel high-pressure oil pipe as claimed in claim 7 or 14, and is characterized by comprising the following steps:
step S1: cutting off the raw material stainless steel straight pipe, and performing primary cold forming processing on a port at one end of the stainless steel straight pipe;
step S2: carrying out high-temperature annealing on a port at one end of the stainless steel straight pipe subjected to the first cold forming processing to form a soft sealing joint;
step S3: two back-to-back nuts are sleeved in the stainless steel straight pipe through the port of the other unprocessed end of the stainless steel straight pipe;
step S4: cold forming the other unprocessed end port of the stainless steel straight pipe to form a hard sealing joint;
step S5: and bending the stainless steel straight pipe with the processed ports at the two ends to form the stainless steel fuel oil high-pressure oil pipe with the soft sealing joint at one end and the hard sealing joint at the other end.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010146760 | 2020-03-05 | ||
| CN2020101467609 | 2020-03-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112091545A true CN112091545A (en) | 2020-12-18 |
Family
ID=73759156
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022022561.5U Active CN213116516U (en) | 2020-03-05 | 2020-09-16 | Stainless steel fuel high-pressure oil pipe |
| CN202010970489.0A Pending CN112091545A (en) | 2020-03-05 | 2020-09-16 | Stainless steel fuel oil high-pressure oil pipe and manufacturing process thereof |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022022561.5U Active CN213116516U (en) | 2020-03-05 | 2020-09-16 | Stainless steel fuel high-pressure oil pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN213116516U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN213116516U (en) * | 2020-03-05 | 2021-05-04 | 上海威克迈龙川汽车发动机零件有限公司 | Stainless steel fuel high-pressure oil pipe |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1520637A1 (en) * | 2003-09-30 | 2005-04-06 | Bayerische Motoren Werke Aktiengesellschaft | Method of making a fork for a steering shaft member and fork made by this method |
| CN204664713U (en) * | 2015-06-05 | 2015-09-23 | 杭州燊燊模具有限公司 | Rapid pipe joint |
| CN107511643A (en) * | 2017-09-25 | 2017-12-26 | 伊顿上飞（上海）航空管路制造有限公司 | Commercial airliner double-walled stainless steel tube processing method and frock |
| CN207064893U (en) * | 2017-05-04 | 2018-03-02 | 山东龙口油管有限公司 | A kind of G. D. I engine high-pressure oil pipe |
| CN109746280A (en) * | 2018-12-28 | 2019-05-14 | 无锡威孚施密特动力系统零部件有限公司 | A kind of manufacturing process of stainless steel heading structure in-cylinder direct-jet high pressure oil pipe |
| CN213116516U (en) * | 2020-03-05 | 2021-05-04 | 上海威克迈龙川汽车发动机零件有限公司 | Stainless steel fuel high-pressure oil pipe |
-
2020
- 2020-09-16 CN CN202022022561.5U patent/CN213116516U/en active Active
- 2020-09-16 CN CN202010970489.0A patent/CN112091545A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1520637A1 (en) * | 2003-09-30 | 2005-04-06 | Bayerische Motoren Werke Aktiengesellschaft | Method of making a fork for a steering shaft member and fork made by this method |
| CN204664713U (en) * | 2015-06-05 | 2015-09-23 | 杭州燊燊模具有限公司 | Rapid pipe joint |
| CN207064893U (en) * | 2017-05-04 | 2018-03-02 | 山东龙口油管有限公司 | A kind of G. D. I engine high-pressure oil pipe |
| CN107511643A (en) * | 2017-09-25 | 2017-12-26 | 伊顿上飞（上海）航空管路制造有限公司 | Commercial airliner double-walled stainless steel tube processing method and frock |
| CN109746280A (en) * | 2018-12-28 | 2019-05-14 | 无锡威孚施密特动力系统零部件有限公司 | A kind of manufacturing process of stainless steel heading structure in-cylinder direct-jet high pressure oil pipe |
| CN213116516U (en) * | 2020-03-05 | 2021-05-04 | 上海威克迈龙川汽车发动机零件有限公司 | Stainless steel fuel high-pressure oil pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| CN213116516U (en) | 2021-05-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111946511B (en) | Stainless steel fuel oil high-pressure oil pipe and manufacturing process thereof | |
| CN112404163B (en) | Preparation method of high-performance difficult-deformation metal precision seamless pipe | |
| CN105583588A (en) | Machining method for inner ring and outer ring of conical roller bearing | |
| CN103624095B (en) | A kind of production technology of fine diamond turning | |
| CN112091545A (en) | Stainless steel fuel oil high-pressure oil pipe and manufacturing process thereof | |
| CN101920304B (en) | Method for forging large steel shaft forging | |
| CN104070330A (en) | Processing technology for improved drill stems | |
| CN102407425A (en) | Method for manufacturing ventilated steel tube made of hull steel | |
| CN102407426A (en) | Method for manufacturing low alloy steel tube of low-temperature pressure vessel | |
| CN100349686C (en) | Friction welding method for making short tie-in oil pipe | |
| CN108443306A (en) | A kind of electric motor of automobile shaft and its processing method | |
| CN103103920B (en) | Manufacturing method for tempering cable clip applied to suspension bridge | |
| CN106584036A (en) | Welded type seamless tube machining method | |
| CN111862319B (en) | Reconstruction method and system for weld joint microcrack morphology and expansion trend | |
| CN118357688B (en) | Titanium alloy air bottle manufacturing method | |
| CN111993000A (en) | Machining method for symmetrical stepped gear shaft of automobile | |
| JPS63220939A (en) | Forging method | |
| CN101988370A (en) | Short-process flexible drill rod producing equipment and process | |
| JPH08243680A (en) | Upsetting method for tube | |
| CN112756859B (en) | Method for confirming gap between end plug and inner welding seam of cladding tube | |
| Chung et al. | Bending Formability of Ferritic Stainless Steels for Application to Tubular Exhaust Manifolds | |
| CN115121722A (en) | Machining process of complex flared conduit | |
| Nanjo et al. | Spinning workability of Al-Mg-Si alloy extruded tube using the forming die | |
| CN114211258B (en) | Preparation process of high-precision seamless steel tube | |
| CN103878553B (en) | The processing method of high accuracy V-ring shape bearing assembly |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 201112 No. 96, Jiangchao Road, Minhang District, Shanghai Applicant after: Saiwo Zhizao (Shanghai) Technology Co.,Ltd. Address before: No.20196 minchao Road, Pujiang Town, Shanghai Applicant before: SHANGHAI WINKELMANN LONGCHUAN (SWL) MOTORCOMPONENTS Co.,Ltd. |
|
| CB02 | Change of applicant information |