CN114433706A - Hydraulic forming machining method for blank cover of straight-through ball valve blank - Google Patents
Hydraulic forming machining method for blank cover of straight-through ball valve blank Download PDFInfo
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- CN114433706A CN114433706A CN202210118005.9A CN202210118005A CN114433706A CN 114433706 A CN114433706 A CN 114433706A CN 202210118005 A CN202210118005 A CN 202210118005A CN 114433706 A CN114433706 A CN 114433706A
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000003754 machining Methods 0.000 title description 2
- 238000007789 sealing Methods 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 13
- 230000033001 locomotion Effects 0.000 claims abstract description 7
- 238000003672 processing method Methods 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 5
- 230000001502 supplementing effect Effects 0.000 claims abstract description 4
- 238000003825 pressing Methods 0.000 claims description 22
- 238000005520 cutting process Methods 0.000 claims description 11
- 230000007704 transition Effects 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 238000007493 shaping process Methods 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 238000007667 floating Methods 0.000 description 8
- 238000005266 casting Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005242 forging Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
- B21D26/047—Mould construction
Abstract
The invention discloses a hydraulic forming processing method of a straight-through ball valve blank cover, wherein the blank body is convex, a concave mould which is the same as the convex blank body in shape is designed according to the length of a tube blank, the mould consists of an upper mould and a lower mould, the joint surface of the upper mould and the lower mould passes through the rotation axis of the blank body, the upper mould is arranged on an upper workbench which moves up and down by a press, the lower mould is fixed on a lower workbench of the press, the upper mould is lifted to place the tube blank into the middle of the lower mould, the upper mould is pressed to be combined with the lower mould, a left pressure head and a right pressure head which are provided with sealing gaskets are pressed to two ends of the tube blank by the press, high-pressure liquid is injected into the tube blank to enable the tube blank to expand and be close to the inner wall of a cavity of the upper mould and the lower mould, and the left pressure head and the right pressure head symmetrically perform material supplementing movement in the expansion process until the tube blank is compressed to the structural length required by the blank body. The method is simple and convenient and has good effect.
Description
Technical Field
The invention relates to the field of manufacturing of valve blanks, in particular to a forming and processing method of a straight-through ball valve blank cover.
Background
The blanks of the valve body and the valve cover of the conventional straight-through ball valve are processed respectively, casting and forging processes are mainly adopted, the problems of poor environmental protection and poor casting compactness and quality exist in the casting process, and the problems of low material utilization rate, time consumption in processing and high cost exist in the valve body produced by the forging process, so that the casting and forging processes have defects respectively. The existing straight-through ball valve also has a process of extruding and shrinking the valve body after assembling the ball body and the tubular valve body and then assembling and welding the two end connector bodies, the process has more welding lines and the defects of undetachable maintenance of the sealing surface.
Disclosure of Invention
The invention aims to provide a hydraulic forming processing method of a straight-through ball valve blank cover, which is simple and convenient in method and good in effect.
The technical solution of the invention is as follows:
a hydraulic forming processing method of a blank cover of a straight-through ball valve blank is characterized by comprising the following steps: designing the shape of a ball valve blank containing a valve body valve cover, wherein the left end and the right end of the blank are provided with cylindrical sections with the same diameter, the diameter of the cylindrical sections is the same as the outer diameter of a seamless steel pipe, the middle section of the blank (containing the blank cover, hereinafter called as the blank) is a rotary type capable of accommodating a valve opening and closing ball body, the upper part of the middle section of the blank is provided with or not provided with a small cylindrical section suitable for installing a fixed part at the upper part of the ball valve, the lower part of the middle section of the blank is provided with or not provided with a small cylindrical section for installing the fixed ball valve part, and the transition part of the middle section of the blank and the left and right cylindrical sections is a rotary type transition section suitable for installing a valve seat; according to the determined shape and size of the left and right sections, the middle section, the upper and lower parts and the left and right transition sections, the weight of the blank is obtained under the condition that the wall thickness of each section is equal, and the length of the seamless steel pipe blank with equal weight, equal diameter and equal wall thickness is obtained according to the weight of the blank; the blank body is of a convex shape, a concave mold which is the same as the shape of the convex blank body is designed according to the length of the tube blank, the mold consists of an upper mold and a lower mold, the joint surface of the upper mold and the lower mold passes through the rotation axis of the blank body, the upper mold is arranged on an upper workbench which moves up and down by a press, the lower mold is fixed on a lower workbench of the press, the tube blank is placed in the middle of the lower mold by lifting up the upper mold, the upper mold is pressed to be combined with the lower mold, left and right pressure heads which are provided with sealing gaskets are pressed to two ends of the tube blank by the press, high-pressure liquid is injected into the tube blank to enable the tube blank to expand and press close to the inner wall of a cavity of the upper mold and the lower mold, and the left and right pressure heads symmetrically perform material supplementing movement in the expansion process until the tube blank is compressed to the structural length required by the blank body.
In order to prevent the upper die from being lifted in the hydraulic forming process, the left end and the right end of the upper die and the lower die are provided with anti-lifting clamping sleeves, after the blank body is subjected to pressure maintaining and shaping to reach the required shape, liquid in a valve cavity is discharged, the left pressing head and the right pressing head are withdrawn, the left clamping sleeve and the right clamping sleeve are withdrawn, the upper die is lifted, and the blank body is ejected out of the lower die.
The hydraulic forming processing method of the straight-through ball valve blank cover comprises the following specific steps:
step 1: preparing tube blanks with matched length, the same outer diameter and wall thickness as the diameters of the left end and the right end of the blank body, the same wall thickness and the same weight, and processing the two end surfaces of the tube blanks to be flat so as to be convenient for sealing;
step 2: the left pressing head and the right pressing head return to the original positions, the left clamping sleeve and the right clamping sleeve return to the original positions, the upper die is lifted, and foreign matters in the lower die are cleaned;
and step 3: placing the blank tube in the middle of the lower die, and pressing the upper die downwards;
and 4, step 4: pressing the left and right cutting sleeves into the outer conical surfaces of the left and right ends respectively;
and 5: the left and right pressure heads symmetrically press the two end surfaces of the tube blank, the sealing gaskets ensure the sealing between the left and right pressure heads and the tube blank, liquid is injected into the tube blank through the holes of the left and right pressure heads, gas is exhausted, high pressure is added to make the inner cavity of the tube blank yield and deform and gradually press close to the inner walls of the cavities of the upper die and the lower die, meanwhile, the press applies symmetrical supplementary material motion to the tube blank by the force exceeding the strength limit of the tube blank through the left and right pressure heads until the tube blank is compressed to the structural length required by the blank body, and the blank body achieves the required shape through pressure maintaining and shaping;
step 6: draining liquid in the green body cavity through the hole of the pressure head;
and 7: withdrawing the left and right pressing heads;
and 8: withdrawing the left and right cutting sleeves;
and step 9: lifting the upper die;
step 10: and the ejection column ejects the formed blank out of the lower die, and after the blank is taken out, the ejection column returns to the original position to complete the whole process.
The wall thickness is selected according to the requirement of higher pressure, the appearance of the blank body is designed, the blank body requirement with lower pressure and wall thickness can be covered, the upper die and the lower die are designed according to different standards of the same nominal diameter and the length of the tube blank corresponding to the maximum structural length of the pressure, so that the dies have universality to be suitable for forming and processing ball valve blank bodies with different structural lengths, and the blank body can be manufactured according to the thicker wall thickness required by high pressure and can cover the thinner wall thickness of low pressure, thereby improving the universality of the blank body.
The formed blank body is in three forms of an upper cylindrical boss and a lower cylindrical boss, only an upper cylindrical boss and no cylindrical boss, so as to meet the requirements of different valves (floating or fixed).
The complete blank body is machined into a proper two-section valve body and a valve cover through cutting, and the valve body and the valve cover after the valve is assembled are in all-welded connection and butt-clamped connection and flange connection.
The complete blank body is machined into a proper two-section valve body and a proper valve cover through cutting; the end part of the separated valve body valve cover is directly processed into a welded end ball valve according to the requirement of the connecting pipe, or a flange is welded at the end part of the valve body valve cover according to the requirement to manufacture a flange end connecting ball valve.
The connecting disc suitable for welding the blank body can adapt to various driving modes.
The invention is that the seamless steel tube with the same (or similar) nominal diameter as the valve is pressed on a proper model and a press, the inner pressure and the axial supply force are applied to the seamless steel tube with specific length and wall thickness, and the mold is clamped in an auxiliary way, the seamless steel tube is formed into a complete blank body of a blank body blank cover of the two-way ball valve suitable for the connection of external pipelines and the assembly of internal parts through different combinations of mold adjusting blocks, the blank body can be formed into cylindrical boss configuration forms with different length and wall thickness and valve rods according to different valve types and pressures, and two valve body valve covers of floating or fixed ball valves with different pressures can be obtained through processing. The method is simple and has good effect.
Drawings
The invention is further illustrated by the following figures and examples.
FIG. 1 is a schematic structural diagram of a blank with upper and lower cylindrical bosses.
Fig. 2 is a schematic view of the structure of the blank with only the upper cylindrical boss.
Fig. 3 is a schematic view of a blank structure without cylindrical bosses.
Figure 4 is a schematic view of a parison tube.
Fig. 5 and 6 are schematic diagrams of the blank before and after molding in half.
Fig. 7 is a schematic diagram of a double-clamped valve body and valve cover floating ball valve with an upper cylindrical boss.
FIG. 8 is a schematic view of an all-welded valve body floating ball valve with an upper cylindrical boss.
Fig. 9 is a schematic view of a floating ball valve with a bolted valve body and valve cover having a cylindrical boss.
FIG. 10 is a schematic view of a flange end clamped valve body and valve cover fixed ball valve with upper and lower cylindrical bosses.
Fig. 11 is a schematic view of an all-welded valve body and valve cover fixed ball valve with upper and lower cylindrical bosses.
Fig. 12 is a schematic view of a bolted valve body and bonnet fixed ball valve with upper and lower cylindrical bosses.
Fig. 13 is a schematic view of a floating ball valve with a welded upper boss and a fully welded valve body and valve cover.
FIG. 14 is a schematic view of a welded upper and lower boss fully welded valve body and valve cover fixed ball valve.
FIG. 15 is a schematic view of a welded upper and lower boss butt-clamped valve body and a valve cover flange connected fixed ball valve.
Detailed Description
A blank cover (hereinafter referred to as blank) of a straight-through ball valve and a hydraulic forming processing method are disclosed, the shape of the blank of the ball valve is designed according to the requirements of being suitable for different pressures and structures and being beneficial to forming and high in universality, the left end 11 and the right end 12 of the blank are provided with cylindrical sections with equal diameters, the diameter D of the cylindrical sections is the same as the outer diameter D of a seamless steel pipe blank (hereinafter referred to as a pipe blank), the middle section 13 of the blank is a rotary type capable of accommodating a valve opening and closing ball body, the top of the middle section 13 is provided with a cylindrical section 16 for installing a valve rod, the bottom of the middle section 13 is provided with a lower cylindrical section 17 for fixing the ball valve, the transition parts of the middle section 13 of the blank and the left and right cylindrical sections 11 and 12 are provided with two rotary type transition sections 14 and 15 suitable for installing a valve seat, and the structural length L and the wall thickness t of the blank are determined according to corresponding pressures and standards. According to the shapes of the left and right sections 11 and 12, the middle section 13, the top small cylindrical section 16, the bottom small cylindrical section 17 and the transition sections 14 and 15 determined above, the wall thickness t of each section is equal to obtain the weight W of the blank, and according to the weight W, the length L1 of the tube blank 10 with the same weight as the diameter and the wall thickness of the left and right sections of the blank can be obtained. The specification of a longest structure length L billet with the same nominal diameter D corresponds to the length L1 of the longest billet, a concave die with the same shape as the convex billet is designed according to the length L1, the die consists of an upper die 21 and a lower die 31, the joint surface of the upper die and the lower die passes through the rotation axis X axis of the billet, the symmetric surface A-A of the middle section 13 of the die and the axis Z of the upper cylindrical boss 16 and the lower cylindrical boss 17 have an eccentricity e, the lower cylindrical section 17 corresponds to the upper die 21 and is arranged on an upper working table 20 which moves up and down in the press, and the upper cylindrical section 16 corresponds to the lower die 31 and is fixed on a lower working table 30 of the press. The upper die 21 is arranged in a die hole corresponding to the lower cylindrical section 17 and is provided with an upper adjusting block 121, so that a blank body of the floating ball valve without the lower cylindrical section 17 can be formed. For a blank body which has higher pressure and thicker wall thickness and is difficult to form the upper cylindrical section and the lower cylindrical section, the upper die 21 is provided with the upper adjusting block 121, and the die hole of the lower die 31 corresponding to the upper cylindrical section 16 is provided with the lower adjusting block 131, so that a blank body without the upper cylindrical section 16 and the lower cylindrical section 17 can be formed. Lifting the upper die 21 to place the tube blank 10 in the middle of the lower die 31, pressing the upper die 21 to the lower die 31 for combination, pressing the left and right press heads 61 and 62 provided with the left and right sealing gaskets 51 and 52 to two ends of the tube blank 10 by the press, injecting high-pressure liquid into the tube blank 10 through the holes P on the left press head 61 and the right press head 62 to enable the tube blank 10 to expand and be close to the inner walls of the cavities of the upper and lower dies 21 and 31, keeping the pressing force by the press and enabling the left and right press heads 61 and 62 to symmetrically perform material supplementing movement in the expansion process until the tube blank 10 is compressed to the structural length L required by the blank from the length L1, shaping the blank to the required shape by pressure maintaining, draining the liquid in the cavity of the blank, withdrawing the left and right press heads 61 and 62, lifting the upper die 21, and ejecting the blank out of the lower die 31 by the ejection column 7. For a blank body with thicker wall thickness and longer structural length, in order to prevent the lifting of an upper die 21 in the hydraulic forming process, the left end and the right end of the upper die 21 are provided with the semi-conical ring platforms 22 and 23, the left end and the right end of a lower die 31 are provided with the semi-conical ring platforms 32 and 33, the two left semi-conical ring platforms 22 and 32 form a complete left end outer conical surface with a self-locking cone angle, the two right semi-conical ring platforms 23 and 33 form a complete right end outer conical surface with a self-locking cone angle, the left end inner clamping sleeve 81 and the right end inner clamping sleeve 82 have the diameter and the cone angle matched with the left end outer conical surface and the right end outer conical surface, and the left end inner clamping sleeve 81 and the right end inner clamping sleeve 82 can independently perform locking and releasing motions along the X direction.
The forming method comprises the following specific steps:
step 1: a tube blank 10 with the length of L1, the outer diameter D and the wall thickness t equal to the diameters of the left end and the right end of the blank, the wall thickness equal to the weight is prepared, and two end surfaces of the tube blank 10 are processed to be flat for sealing.
Step 2: the left and right rams 61 and 62 return to their original positions, the left and right ferrules 81 and 82 return to their original positions, and the upper die 21 is lifted up to clean foreign matters in the lower die 31.
And step 3: the raw pipe 10 is placed between the lower dies 31, and the upper die 21 is pressed down.
And 4, step 4: the left and right cutting sleeves 81 and 82 are pressed into engagement with the left and right outer conical surfaces, respectively.
And 5: the left and right pressing heads 61 and 62 symmetrically press the two end surfaces of the tube blank 10, the left and right sealing gaskets 51 and 52 ensure the sealing between the pressing heads and the tube blank, liquid is injected into the tube blank 10 through the holes of the left and right pressing heads 61 and 62, gas is exhausted, high pressure is added to enable the inner cavity of the tube blank 10 to yield and deform and gradually cling to the inner walls of the concave cavities of the upper die 21 and the lower die 31, meanwhile, the press applies force exceeding the strength limit to the tube blank 10 through the left and right pressing heads 61 and 62 to symmetrically move on a symmetrical surface until the tube blank 10 is compressed to the structural length L required by a blank body, and pressure maintaining and shaping are carried out to enable the blank body to reach the required shape.
Step 6: and discharging the liquid in the green body cavity through the hole of the pressure head.
And 7: the left and right rams 61 and 62 are withdrawn.
And 8: the left and right ferrules 81 and 82 are withdrawn.
And step 9: the upper die 21 is lifted.
Step 10: the ejection column 7 ejects the formed blank out of the lower die 31, and after the blank is taken out, the ejection column 7 returns to the original position to complete the whole process.
The forming blank body is provided with a wall thickness according to a higher pressure requirement and the appearance of the blank body is designed, the blank body with lower pressure and wall thickness can be covered, the upper die and the lower die are designed according to different standards of the same nominal diameter and the length of the blank tube corresponding to the maximum structural length of the pressure, and therefore the dies have universality and are suitable for forming and processing ball valve blank bodies with shorter structural lengths, and the universality of the blank body is improved.
The formed blank body can be provided with an upper cylindrical boss and a lower cylindrical boss, and only has the upper cylindrical boss and no cylindrical boss so as to adapt to the requirements of different valves (floating or fixed).
The complete blank body is machined into a proper two-section valve body and a valve cover through cutting, and the valve body and the valve cover after the valve is assembled can be in all-welded connection and butt-clamped connection and flange connection.
The end part of the valve cover of the valve body which is processed and separated can be directly processed into a welded end ball valve according to the requirement of the connecting pipe; and a flange can be welded at the end part of the valve cover of the valve body according to requirements to manufacture a flange end connection ball valve.
The auxiliary pressing conical cutting sleeve can be used for judging whether the conditions of different calibers and pressure blank bodies are selected or not.
The connecting disc suitable for welding can adapt to various driving modes.
Although the present invention has been described with reference to the preferred embodiments, it should be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A hydraulic forming processing method of a blank cover of a straight-through ball valve blank is characterized by comprising the following steps: designing the shape of a ball valve blank containing a valve body valve cover, wherein the left end and the right end of the blank are provided with cylindrical sections with the same diameter, the diameter of the cylindrical sections is the same as the outer diameter of a seamless steel pipe, the middle section of the blank is a rotary type capable of accommodating a valve opening and closing ball body, the upper part of the middle section of the blank is provided with or not provided with a small cylindrical section suitable for mounting a fixed part on the upper part of the ball valve, the lower part of the middle section of the blank is provided with or not provided with a small cylindrical section for mounting the fixed ball valve part, and the transition part between the middle section of the blank and the left and right cylindrical sections is a rotary type transition section suitable for mounting a valve seat; according to the determined shape and size of the left and right sections, the middle section, the upper and lower parts and the left and right transition sections, the weight of the blank is obtained under the condition that the wall thickness of each section is equal, and the length of the seamless steel pipe blank with equal weight, equal diameter and equal wall thickness is obtained according to the weight of the blank; the blank body is of a convex shape, a concave mold which is the same as the shape of the convex blank body is designed according to the length of the tube blank, the mold consists of an upper mold and a lower mold, the joint surface of the upper mold and the lower mold passes through the rotation axis of the blank body, the upper mold is arranged on an upper workbench which moves up and down by a press, the lower mold is fixed on a lower workbench of the press, the tube blank is placed in the middle of the lower mold by lifting up the upper mold, the upper mold is pressed to be combined with the lower mold, left and right pressure heads which are provided with sealing gaskets are pressed to two ends of the tube blank by the press, high-pressure liquid is injected into the tube blank to enable the tube blank to expand and press close to the inner wall of a cavity of the upper mold and the lower mold, and the left and right pressure heads symmetrically perform material supplementing movement in the expansion process until the tube blank is compressed to the structural length required by the blank body.
2. The hydroforming process of a straight-through ball valve blank cap according to claim 1, wherein: in order to prevent the upper die from being lifted in the hydraulic forming process, the left end and the right end of the upper die and the lower die are provided with anti-lifting clamping sleeves, after the blank body is subjected to pressure maintaining and shaping to reach the required shape, liquid in a valve cavity is discharged, the left pressing head and the right pressing head are withdrawn, the left clamping sleeve and the right clamping sleeve are withdrawn, the upper die is lifted, and the blank body is ejected out of the lower die.
3. The hydroforming process of a straight-through ball valve blank cap according to claim 2, wherein: the method comprises the following specific steps:
step 1: preparing tube blanks with matched length, the same outer diameter and wall thickness as the diameters of the left end and the right end of the blank body, the same wall thickness and the same weight, and processing the two end surfaces of the tube blanks to be flat so as to be convenient for sealing;
step 2: the left pressing head and the right pressing head return to the original positions, the left clamping sleeve and the right clamping sleeve return to the original positions, the upper die is lifted, and foreign matters in the lower die are cleaned;
and step 3: placing the blank tube in the middle of the lower die, and pressing the upper die downwards;
and 4, step 4: pressing the left and right cutting sleeves into the outer conical surfaces of the left and right ends respectively;
and 5: the left and right pressure heads symmetrically press the two end surfaces of the tube blank, the sealing gaskets ensure the sealing between the left and right pressure heads and the tube blank, liquid is injected into the tube blank through the holes of the left and right pressure heads, gas is exhausted, high pressure is added to make the inner cavity of the tube blank yield and deform and gradually press close to the inner walls of the cavities of the upper die and the lower die, meanwhile, the press applies symmetrical supplementary material motion to the tube blank by the force exceeding the strength limit of the tube blank through the left and right pressure heads until the tube blank is compressed to the structural length required by the blank body, and the blank body achieves the required shape through pressure maintaining and shaping;
step 6: draining liquid in the green body cavity through the hole of the pressure head;
and 7: withdrawing the left and right pressing heads;
and 8: withdrawing the left and right cutting sleeves;
and step 9: lifting the upper die;
step 10: and the ejection column ejects the formed blank out of the lower die, and after the blank is taken out, the ejection column returns to the original position to complete the whole process.
4. The hydroforming process of a straight-through ball valve blank cap according to claim 1, 2 or 3, characterized in that: the wall thickness is selected according to the requirement of higher pressure, the appearance of the blank body is designed, the blank body requirement with lower pressure and wall thickness can be covered, the upper die and the lower die are designed according to different standards of the same nominal diameter and the length of the tube blank corresponding to the maximum structural length of the pressure, so that the dies have universality to be suitable for forming and processing ball valve blank bodies with different structural lengths, and the blank body can be manufactured according to the thicker wall thickness required by high pressure and can cover the thinner wall thickness of low pressure, thereby improving the universality of the blank body.
5. The hydroforming process of a straight-through ball valve blank cap according to claim 1, 2 or 3, characterized in that: the formed blank body is in three forms of an upper cylindrical boss and a lower cylindrical boss, only an upper cylindrical boss and no cylindrical boss, so as to meet the requirements of different valves.
6. The hydroforming process of a straight-through ball valve blank cap according to claim 1, 2 or 3, characterized in that: the complete blank body is machined into a proper two-section valve body and a valve cover through cutting, and the valve body and the valve cover after the valve is assembled are in all-welded connection and butt-clamped connection and flange connection.
7. The hydroforming process of a straight-through ball valve blank cap according to claim 1, 2 or 3, characterized in that: the complete blank body is machined into a proper two-section valve body and a proper valve cover through cutting; the end part of the separated valve body valve cover is directly processed into a welded end ball valve according to the requirement of the connecting pipe, or a flange is welded at the end part of the valve body valve cover according to the requirement to manufacture a flange end connecting ball valve.
8. The hydroforming process of a straight-through ball valve blank cap according to claim 1, 2 or 3, characterized in that: the connecting disc suitable for welding the blank body can adapt to various driving modes.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210118005.9A CN114433706A (en) | 2022-02-08 | 2022-02-08 | Hydraulic forming machining method for blank cover of straight-through ball valve blank |
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| CN202210118005.9A CN114433706A (en) | 2022-02-08 | 2022-02-08 | Hydraulic forming machining method for blank cover of straight-through ball valve blank |
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2022
- 2022-02-08 CN CN202210118005.9A patent/CN114433706A/en active Pending
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| CN101234464A (en) * | 2008-01-22 | 2008-08-06 | 西安交通大学 | Ball valve core hydraulic expansion method |
| CN106216481A (en) * | 2016-09-14 | 2016-12-14 | 哈尔滨工业大学 | A kind of big section difference odd-shaped cross section pipe fitting swelling pressure combined shaping method |
| CN113028116A (en) * | 2021-03-29 | 2021-06-25 | 陈崇南 | Blank body of circular cavity valve body-containing valve cover suitable for multi-valve valves and machining method |
| CN113028114A (en) * | 2021-04-15 | 2021-06-25 | 陈崇南 | Blank body suitable for flat oval cavity of multi-valve type valve and containing valve body and valve cover and forming method |
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