CN113547282B - Production process of corrugated pipe assembly - Google Patents
Production process of corrugated pipe assembly Download PDFInfo
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- CN113547282B CN113547282B CN202010337243.XA CN202010337243A CN113547282B CN 113547282 B CN113547282 B CN 113547282B CN 202010337243 A CN202010337243 A CN 202010337243A CN 113547282 B CN113547282 B CN 113547282B
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- 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
- B23P15/001—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass valves or valve housings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K41/00—Spindle sealings
- F16K41/10—Spindle sealings with diaphragm, e.g. shaped as bellows or tube
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Abstract
The invention discloses a production process of a corrugated pipe assembly, which comprises the following steps: prefabricating a valve rod according to a required size; carrying out heat treatment on the valve rod; hard grinding the bottom end of the valve rod by a hard grinding machine; welding the corrugated pipe and the corrugated pipe seat group; performing stress heat treatment on the welded corrugated pipe and the valve seat; bending the elastic sheet of the valve clack towards the connecting groove by using a press machine and abutting against the shaft shoulder; welding the valve clack, the corrugated pipe and the valve seat; and performing stress heat treatment on the welded valve clack, the corrugated pipe and the valve seat. The corrugated pipe assembly is not easy to generate the situation of welding seam cracking after being used for a long time, the strength of the corrugated pipe assembly and the valve rod after heat treatment is increased, the axial bending deformation of the valve rod is reduced to a certain extent, the structural stability is high, the abrasion in the corrugated pipe assembly and the unilateral pressure (abrasion force) on the valve body caused by the integral axial deformation of the corrugated pipe assembly are avoided, and the frequent shutdown maintenance is not needed.
Description
Technical Field
The invention relates to the field of corrugated pipe valves, in particular to a production process of a corrugated pipe assembly.
Background
Valves using bellows as the sealing element for the valve stem are often used in applications where tight valve stem sealing is required, such as in high vacuum applications and in the nuclear industry. The corrugated pipe is used to replace the stuffing box of common valve or be used together with the stuffing box. Bellows shut-off valves and bellows gate valves are common. In order to facilitate the assembly of the corrugated pipe gate valve or the stop valve, an assembly part of the corrugated pipe, the valve clack and the valve rod is already arranged in the prior art, and when the corrugated pipe valve is assembled, the assembly part is integrally arranged inside the valve body, so that the process is simple, convenient and fast. However, the bellows assembly has a certain defect, the valve rod is bent axially along with the prolonging of the use period, so that the valve rod and the valve seat are seriously abraded on one side, in addition, the bellows and the valve seat and the bellows and the valve clack are welded, and cracks are easy to appear along with the opening and closing oscillation of the bellows, so that the frequency of later maintenance and inspection is high. In view of the above problems, the present invention provides a process for producing a bellows assembly.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a process for producing a bellows assembly.
The utility model provides a production technology of bellows subassembly, the bellows subassembly includes disk seat, bellows, valve clack and valve rod, bellows welded fastening is in the disk seat below, the valve clack welding is in the bellows bottom, and the valve clack center forms the spread groove, and the valve clack has at least two shell fragments that extend towards the disk seat by the spread groove periphery, the valve rod passes through the shell fragment to be connected with the valve clack, and the valve rod has the shaft shoulder and carries on spacingly with the shell fragment, production technology includes:
Prefabricating a valve rod according to a required size, wherein the allowance of the bottom end of the valve rod is 0.2 +/-0.02 mm;
carrying out heat treatment on the valve rod: placing the valve rod in a heat treatment furnace, heating to 600 ℃, and keeping the temperature constant for 30 min; heating to 800 deg.C, and keeping the temperature constant for 30 min; heating to 1230 deg.C and maintaining for 30 min; then carrying out cryogenic treatment, placing the valve rod in a cooling container, cooling to-80 ℃, and preserving heat for at least 90 min; tempering the valve rod to 150 ℃ in a first stage, and keeping the temperature for at least 90 min; and (3) carrying out second-stage tempering treatment on the valve rod: tempering to 150 ℃, and keeping the temperature for at least 90 min;
hard grinding the bottom end of the valve rod by a hard grinding machine, adding W5 diamond micropowder during the hard grinding process, wherein the machine tool rotation speed is 50-70rpm, the pressure is 2-3atm, the grinding amount in unit time is 0.0002-0.0005 mm/h, and the grinding is stopped when the actual length of the valve rod is +/-0.02 mm;
welding the corrugated pipe and the valve seat, wherein a first welding seam and a second welding seam are formed at the bottom of the valve seat and the top of the corrugated pipe, the first welding seam is formed between the inner ring of the corrugated pipe and the bottom of the valve seat, the second welding seam is formed at a position 51-0 mm away from the inner ring of the corrugated pipe, energy is controlled to be input uniformly in the welding process, and the formed welding seams are guaranteed to be uniform;
and (3) performing stress heat treatment on the welded corrugated pipe and the valve seat: firstly, placing the corrugated pipe and the valve seat in a heat treatment furnace, heating to 1100 ℃, and preserving heat for 20-30 min; secondly, rapidly putting the corrugated pipe and the valve seat into cold water to be cooled to normal temperature; finally, the corrugated pipe and the valve seat are placed in a heat treatment furnace to be heated to 550 ℃, and the temperature is kept for 5 hours;
The bottom of the valve rod extends into the connecting groove, the elastic sheet of the valve clack is bent towards the connecting groove by a press machine and is abutted against the shaft shoulder, and the ratio of the thickness of the elastic sheet to the thickness of the notch of the press machine is 6: 1;
welding the valve flap, the corrugated pipe and the valve seat, wherein a third welding seam and a fourth welding seam are formed between the top of the valve flap and the bottom of the corrugated pipe, the third welding seam is formed between the inner ring of the corrugated pipe and the bottom of the valve seat, the fourth welding seam is formed at a position 8-10 mm away from the inner ring of the corrugated pipe, and the formed welding seams are guaranteed to be consistent in the welding process;
and (3) performing stress heat treatment on the welded valve clack, the corrugated pipe and the valve seat: placing in a heat treatment furnace, heating to 500 deg.C, and keeping the temperature for 10 min; continuously heating to 800 deg.C, and keeping the temperature for 10 min; continuously heating to 1100 ℃ and preserving heat for 20-30 min; quickly putting the valve clack, the corrugated pipe and the valve seat into cold water to be cooled to normal temperature; finally, the corrugated pipe and the valve seat are placed in a heat treatment furnace to be heated to 550 ℃, and the temperature is kept for 5 hours.
Specifically, when the corrugated pipe and the valve seat are welded, during welding, the first welding seam and the second welding seam comprise two layers of welding beads, the first layer of welding beads are welded by thin welding rods, and the second layer of welding beads are welded by thick welding rods.
Specifically, the diameter of the thin electrode is phi 3.2mm, and the diameter of the thick electrode is phi 4.0 or phi 5.0 mm.
Specifically, the corrugated pipe is made of WCB, WCC, LCB and LC, the valve seat is made of A105 and LF2, and the corrugated pipe and the valve seat are made of J507 welding rods.
Specifically, the method further comprises a first preheating treatment step before the step (4): and (4) preheating the corrugated pipe, wherein the preheating range is 20-30 mm from the top of the corrugated pipe downwards.
Specifically, before the step (7), a second preheating step is further included: preheating the corrugated pipe within the range of 20-30 mm from the first part of the corrugated pipe.
The invention has the beneficial effects that: the corrugated pipe assembly is not easy to generate the situation of weld cracking after long-term use, the strength of the corrugated pipe assembly and the valve rod after heat treatment is increased, the axial bending deformation of the valve rod is reduced to a certain extent, the structural stability is high, the abrasion in the corrugated pipe assembly and the unilateral pressure (abrasion force) on the valve body caused by the integral axial deformation of the corrugated pipe assembly are avoided, and the frequent shutdown maintenance is not needed.
Drawings
FIG. 1 is a schematic structural view of a bellows assembly according to the present invention;
FIG. 2 is a graph showing a heat treatment in step (2);
FIG. 3 is a graph showing the heat treatment in step (8).
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention will be further described with reference to the accompanying drawings.
In order to solve the above technical problems, the present invention provides a process for producing a bellows assembly.
Implement a production technology of bellows subassembly, integrative piece of bellows includes disk seat 1, bellows 2, valve clack 3 and valve rod 4, bellows welded fastening is in the disk seat below, the valve clack welding is in the bellows bottom, and 3 centers of valve clack form spread groove 5, and valve clack 3 has at least two shell fragments 6 that extend towards disk seat 1 by spread groove 5 periphery, valve rod 4 bottom stretches into in the spread groove 5, valve rod 4 forms shaft shoulder 7 in the position department that corresponds shell fragment 6, and the lower part of shaft shoulder 7 forms annular 8, it is spacing that the butt is carried out through shaft shoulder 7 in stretching into annular 8 to shell fragment 6. The valve clack 3 is provided with a diversion ring groove 13 at the position close to the bottom end of the corrugated pipe 2. The thickness of the elastic sheet 6 is 2-5 mm. And will generally be selected adaptively according to the size of the bellows valve.
The process for producing the bellows assembly is described below in connection with two specific embodiments.
Example 1
The production process comprises the following steps:
(1) prefabricating a valve rod according to the required size, wherein the allowance of the bottom end of the valve rod is 0.2 +/-0.02 mm;
(2) and carrying out heat treatment on the valve rod: placing the valve rod in a heat treatment furnace, heating to 600 ℃, and keeping the temperature constant for 30 min; heating to 800 deg.C, keeping the temperature constant for 30 min; heating to 1230 deg.C and maintaining for 30 min; then carrying out cryogenic treatment, placing the valve rod in a cooling container, cooling to-80 ℃, and preserving heat for 90 min; tempering the valve rod to 150 ℃ in a first stage, and keeping the temperature for 90 min; and (3) carrying out second-stage tempering treatment on the valve rod: tempering to 150 ℃, and preserving heat for 90 min;
(3) hard grinding the bottom end of the valve rod by a hard grinding machine, adding W5 diamond micropowder during the hard grinding process, wherein the machine tool rotation speed is 50-70rpm, the pressure is 2-3atm, the grinding amount in unit time is 0.0002-0.0005 mm/h, and the grinding is stopped until the actual length of the valve rod is +/-0.02 mm;
(4) welding the corrugated pipe and the valve seat, wherein a first welding seam 9 and a second welding seam 10 are formed at the bottom of the valve seat and the top of the corrugated pipe, the first welding seam 9 is formed between the inner ring of the corrugated pipe and the bottom of the valve seat, the second welding seam 10 is formed at a position 5-10 mm away from the inner ring of the corrugated pipe, and the formed welding seams are ensured to be consistent in the welding process; during welding, the first welding seam 9 and the second welding seam 10 both comprise two layers of welding beads, the first layer of welding bead is welded by adopting a thin welding rod, the second layer of welding bead is welded by adopting a thick welding rod, and specifically, the diameter phi of the thin welding rod is 3.2mm, and the diameter phi of the thick welding rod is 4.0.
(5) And performing stress heat treatment on the welded corrugated pipe and the valve seat: firstly, placing the corrugated pipe and the valve seat in a heat treatment furnace, heating to 1100 ℃, and preserving heat for 30 min; secondly, rapidly putting the corrugated pipe and the valve seat into cold water to be cooled to normal temperature; finally, the corrugated pipe and the valve seat are placed in a heat treatment furnace to be heated to 550 ℃, and the temperature is kept for 5 hours; after the stress heat treatment, the stress at the welding position of the corrugated pipe and the corrugated pipe seat is reduced, the defect that the welding seam has cracks after long-term use is avoided, and the later maintenance frequency is reduced; meanwhile, the integral hardness of the corrugated pipe assembly is increased to a certain degree, the axial bending deformation is reduced to a certain degree, the structural stability is high, the abrasion in the corrugated pipe assembly and the unilateral pressure (abrasion force) on the valve body caused by the integral axial deformation of the corrugated pipe assembly are avoided, and the valve is not required to be frequently stopped, overhauled and maintained.
(6) The bottom of the valve rod extends into the connecting groove, the elastic sheet of the valve clack is bent towards the connecting groove by utilizing a press machine and is abutted against the shaft shoulder, the ratio of the thickness of the elastic sheet to the thickness of the notch of the press machine is 6: 1, the thickness of the elastic sheet is 4mm, and the width of the notch of the press machine is 32 mm;
(7) the valve clack, the corrugated pipe and the valve seat are welded, a third welding line 11 and a fourth welding line 12 are formed between the top of the valve clack and the bottom of the corrugated pipe, the third welding line 11 is formed between the inner ring of the corrugated pipe and the bottom of the valve seat, the fourth welding line 12 is formed at a position 8mm away from the inner ring of the corrugated pipe, and the formed welding lines are guaranteed to be consistent in the welding process. During welding, third welding seam 11 and fourth welding seam 12 include 2 ~ 3 layers of welding beads, and the first layer welding bead adopts thin welding rod to weld, and remaining two-layer welding bead adopts thick welding rod to weld, and is concrete, thin welding rod diameter phi 3.2mm, thick welding rod diameter phi 4.0.
(8) And (3) performing stress heat treatment on the welded valve clack, the corrugated pipe and the valve seat: placing in a heat treatment furnace, heating to 500 deg.C, and keeping the temperature for 10 min; heating to 800 deg.C, and maintaining the temperature for 10 min; continuously heating to 1100 deg.C and maintaining the temperature for 20 min; quickly putting the valve clack, the corrugated pipe and the valve seat into cold water to be cooled to normal temperature; finally, the corrugated pipe and the valve seat are placed in a heat treatment furnace to be heated to 550 ℃, and the temperature is kept for 5 hours.
Specifically, the corrugated pipe is made of WCB or WCC, the valve seat is made of A105, and the corrugated pipe and the valve seat are made of J507 welding rods.
The valve rod is made of stainless steel, carbon steel or alloy steel, and the hardness of the valve rod is about HRC40 after quenching, and the hardness of the valve rod is increased to more than HRC60 after cryogenic treatment. Like this, the valve rod is difficult for appearing the deformation in the use in later stage, that is to say axial deformation reduces, consequently can not lead to the fact wearing and tearing to the bellows seat, in addition, also helps improving overall structure's stability.
Example 2
The production process comprises the following steps:
(1) prefabricating a valve rod according to the required size, wherein the allowance of the bottom end of the valve rod is 0.2 +/-0.02 mm;
(2) and carrying out heat treatment on the valve rod: placing the valve rod in a heat treatment furnace, heating to 600 ℃, and keeping the temperature constant for 30 min; heating to 800 deg.C, keeping the temperature constant for 30 min; heating to 1230 deg.C and maintaining for 30 min; then, carrying out cryogenic treatment, placing the valve rod in a cooling container, cooling to-80 ℃, and preserving heat for 100 min; tempering the valve rod to 150 ℃ in a first stage, and keeping the temperature for 120 min; and (3) carrying out second-stage tempering treatment on the valve rod: tempering to 150 ℃, and keeping the temperature for at least 90 min;
(3) Hard grinding the bottom end of the valve rod by a hard grinding machine, adding W5 diamond micropowder during the hard grinding process, wherein the machine tool rotation speed is 50-70rpm, the pressure is 2-3atm, the grinding amount in unit time is 0.0002-0.0005 mm/h, and the grinding is stopped until the actual length of the valve rod is +/-0.02 mm;
(4) a first preheating step: preheating the corrugated pipe, wherein the preheating range is 20-30 mm from the top of the corrugated pipe to the bottom, and the preheating treatment adopts electric heating.
(5) Welding the corrugated pipe and the valve seat, wherein a first welding seam and a second welding seam are formed between the bottom of the valve seat and the top of the corrugated pipe, the first welding seam is formed between the inner ring of the corrugated pipe and the bottom of the valve seat, the second welding seam is formed at a position 5-6 mm away from the inner ring of the corrugated pipe, and the formed welding seams are ensured to be consistent in the welding process; during welding, the first welding seam and the second welding seam both comprise two layers of welding beads, the first layer of welding bead is welded by adopting a thin welding rod, the second layer of welding bead is welded by adopting a thick welding rod, and specifically, the diameter phi of the thin welding rod is 3.2mm, and the diameter phi of the thick welding rod is 5.0.
(6) And performing stress heat treatment on the welded corrugated pipe and the valve seat: firstly, placing the corrugated pipe and the valve seat in a heat treatment furnace, heating to 1100 ℃, and preserving heat for 30 min; secondly, rapidly putting the corrugated pipe and the valve seat into cold water to be cooled to normal temperature; finally, the corrugated pipe and the valve seat are placed in a heat treatment furnace to be heated to 550 ℃, and the temperature is kept for 5 hours;
(7) The bottom of the valve rod extends into the connecting groove, the elastic sheet of the valve clack is bent towards the connecting groove by utilizing a press machine and is abutted against the shaft shoulder, the ratio of the thickness of the elastic sheet to the thickness of the notch of the press machine is 6: 1, the thickness of the elastic sheet is 4mm, and the width of the notch of the press machine is 32 mm;
(8) a second preheating treatment step: preheating the corrugated pipe, wherein the preheating range is 20-30 mm from the first part of the corrugated pipe to the upper part.
(9) And welding the valve clack, the corrugated pipe and the valve seat, wherein a third welding line and a fourth welding line are formed between the top of the valve clack and the bottom of the corrugated pipe, the third welding line is formed between the inner ring of the corrugated pipe and the bottom of the valve seat, the fourth welding line is formed at a position 8mm away from the inner ring of the corrugated pipe, and the formed welding lines are ensured to be consistent in the welding process. During welding, the third welding seam and the fourth welding seam include 2 ~ 3 layers of welding beads, and the first layer welding bead adopts thin welding rod to weld, and remaining two-layer welding bead adopts thick welding rod to weld, and is concrete, thin welding rod diameter phi 3.2mm, thick welding rod diameter phi 5.0.
(10) And (3) performing stress heat treatment on the welded valve clack, the corrugated pipe and the valve seat: placing in a heat treatment furnace, heating to 500 deg.C, and keeping the temperature for 10 min; continuously heating to 800 deg.C, and keeping the temperature for 10 min; continuously heating to 1100 ℃ and keeping the temperature for 30 min; quickly putting the valve clack, the corrugated pipe and the valve seat into cold water to be cooled to normal temperature; finally, the corrugated pipe and the valve seat are placed in a heat treatment furnace to be heated to 550 ℃, and the temperature is kept for 5 hours.
Specifically, the material of the corrugated pipe is LCB or LC, the material of the valve seat is LF2, and J507 welding electrodes are adopted for the corrugated pipe and the valve seat.
The welding rod selection of the valve clack, the corrugated pipe and the valve seat made of different materials during welding is provided: the valve clack is made of CF8 and is welded with a corrugated pipe material F304 by adopting an A132 or A137 stainless steel welding rod; the valve flap is made of CF3 and is welded with the corrugated pipe by 304L, and A002 welding rods are adopted; the valve flap is made of CF8M and the corrugated pipe is welded in F316, and A212 or A217 stainless steel welding rods are adopted; the valve clack is made of CF3M and the corrugated pipe is welded with 316L, and an A022 welding electrode is adopted; the valve clack is made of WCB, WCC and LCB, is welded with 1Cr13 corrugated pipe material, and adopts A302 or A307 stainless steel welding rods. The valve clack is made of WC5, WC6, WC9, 1Cr5M0, is welded with the valve seat by F304 and F316, and adopts A402 or A407 stainless steel welding rods. The valve clack is made of WC5, WC6, WC9 and 1Cr5M0, is welded with the valve seat by 1Cr13, and adopts A402 or A407 stainless steel welding electrodes.
In specific implementation, the following preparation work is required before welding: and (3) strictly cleaning the welding groove and the range of 20mm on two sides of the welding groove before welding, wherein water, oil, rust, oxides and the like are not required in the range. Casting defects such as sand inclusion, cracks, looseness and the like are not allowed at the groove. If the defects exist, welding can be carried out after repair welding is carried out according to the casting repair welding process. The welding rod before welding is dried according to the temperature and time specified by the welding rod specification, and the dried welding rod is placed into a welding rod heat-preserving cylinder at about 150 ℃ for use and taking at any time.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides a production technology of bellows subassembly, the bellows subassembly includes disk seat, bellows, valve clack and valve rod, bellows welded fastening is in the disk seat below, the valve clack welding is in the bellows bottom, and the valve clack center forms the spread groove, and the valve clack has two at least shell fragments that extend towards the disk seat by the spread groove periphery, the valve rod passes through the shell fragment to be connected with the valve clack, and the valve rod has the shaft shoulder and carries on spacingly with the shell fragment, its characterized in that, production technology includes:
(1) prefabricating a valve rod according to the required size, wherein the allowance of the bottom end of the valve rod is 0.2 +/-0.02 mm;
(2) carrying out heat treatment on the valve rod: placing the valve rod in a heat treatment furnace, heating to 600 ℃, and keeping the temperature constant for 30 min; heating to 800 deg.C, keeping the temperature constant for 30 min; heating to 1230 deg.C and maintaining for 30 min; then carrying out cryogenic treatment, placing the valve rod in a cooling container, cooling to-80 ℃, and preserving heat for at least 90 min; tempering the valve rod to 150 ℃ in a first stage, and keeping the temperature for at least 90 min; and (3) carrying out second-stage tempering treatment on the valve rod: tempering to 150 ℃, and keeping the temperature for at least 90 min;
(3) Hard grinding the bottom end of the valve rod by a hard grinding machine, adding W5 diamond micropowder during the hard grinding process, grinding the valve rod until the actual length of the valve rod is +/-0.02 mm, wherein the rotating speed of a machine tool is 50-70rpm, the pressure is 2-3atm, and the grinding amount in unit time is 0.0002-0.0005 mm/S;
(4) welding the corrugated pipe and the valve seat, wherein a first welding seam and a second welding seam are formed at the bottom of the valve seat and the top of the corrugated pipe, the first welding seam is formed between the inner ring of the corrugated pipe and the bottom of the valve seat, the second welding seam is formed at a position 5-10 mm away from the inner ring of the corrugated pipe, energy is controlled to be input uniformly in the welding process, and the formed welding seams are guaranteed to be consistent;
(5) and (3) performing stress heat treatment on the welded corrugated pipe and the valve seat: firstly, placing the corrugated pipe and the valve seat in a heat treatment furnace, heating to 1100 ℃, and preserving heat for 20-30 min; secondly, rapidly putting the corrugated pipe and the valve seat into cold water to be cooled to normal temperature; finally, the corrugated pipe and the valve seat are placed in a heat treatment furnace to be heated to 550 ℃, and the temperature is kept for 5 hours;
(6) the bottom of the valve rod extends into the connecting groove, the elastic sheet of the valve clack is bent towards the connecting groove by a press machine and is abutted against the shaft shoulder, and the ratio of the thickness of the elastic sheet to the thickness of the notch of the press machine is 6: 1;
(7) welding the valve flap, the corrugated pipe and the valve seat, wherein a third welding seam and a fourth welding seam are formed between the top of the valve flap and the bottom of the corrugated pipe, the third welding seam is formed between the inner ring of the corrugated pipe and the bottom of the valve seat, the fourth welding seam is formed at a position 8-10 mm away from the inner ring of the corrugated pipe, and the formed welding seams are ensured to be uniform in the welding process;
(8) And (3) performing stress heat treatment on the welded valve clack, the corrugated pipe and the valve seat: placing in a heat treatment furnace, heating to 500 deg.C, and keeping the temperature for 10 min; continuously heating to 800 deg.C, and keeping the temperature for 10 min; continuously heating to 1100 ℃ and preserving heat for 20-30 min; quickly putting the valve clack, the corrugated pipe and the valve seat into cold water to be cooled to normal temperature; finally, the corrugated pipe and the valve seat are placed in a heat treatment furnace to be heated to 550 ℃, and the temperature is kept for 5 hours.
2. The process for producing a bellows assembly according to claim 1, wherein: when the corrugated pipe and the valve seat are welded, during welding, the first welding seam and the second welding seam comprise two layers of welding beads, the first layer of welding bead is welded by adopting a thin welding rod, and the second layer of welding bead is welded by adopting a thick welding rod.
3. The process for producing a bellows assembly according to claim 1, wherein: the diameter of the thin welding rod is phi 3.2mm, and the diameter of the thick welding rod is phi 4.0 or phi 5.0 mm.
4. The process for producing a bellows assembly according to claim 1, wherein: the corrugated pipe is made of WCB, WCC, LCB and LC, the valve seat is made of A105 and LF2, and the corrugated pipe and the valve seat are made of J507 welding rods.
5. The process for producing a bellows assembly according to claim 1, wherein: the method also comprises a first preheating treatment step before the step (4): and (4) preheating the corrugated pipe, wherein the preheating range is 20-30 mm from the top of the corrugated pipe downwards.
6. The process for producing a bellows assembly according to claim 1, wherein: before the step (7), a second preheating treatment step is also included: preheating the corrugated pipe within the range of 20-30 mm from the first part of the corrugated pipe.
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| CN109158460A (en) * | 2018-08-22 | 2019-01-08 | 中国原子能科学研究院 | A kind of manufacturing method of bellows |
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| CN109158460A (en) * | 2018-08-22 | 2019-01-08 | 中国原子能科学研究院 | A kind of manufacturing method of bellows |
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