CN115255107A - Hydraulic forming sealing head and design method thereof - Google Patents
Hydraulic forming sealing head and design method thereof Download PDFInfo
- Publication number
- CN115255107A CN115255107A CN202210784253.7A CN202210784253A CN115255107A CN 115255107 A CN115255107 A CN 115255107A CN 202210784253 A CN202210784253 A CN 202210784253A CN 115255107 A CN115255107 A CN 115255107A
- Authority
- CN
- China
- Prior art keywords
- sealing
- section
- conical
- alpha
- diameter
- 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
- 238000007789 sealing Methods 0.000 title claims abstract description 220
- 238000000034 method Methods 0.000 title claims description 18
- 230000007704 transition Effects 0.000 claims abstract description 8
- 238000002347 injection Methods 0.000 claims description 24
- 239000007924 injection Substances 0.000 claims description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000005336 cracking Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Images
Classifications
-
- 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
- B21D26/045—Closing or sealing means
-
- 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
-
- 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
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2113/00—Details relating to the application field
- G06F2113/14—Pipes
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Geometry (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Computational Mathematics (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Pure & Applied Mathematics (AREA)
- Computer Hardware Design (AREA)
- Evolutionary Computation (AREA)
- General Engineering & Computer Science (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention provides a hydraulic forming sealing head which comprises a sealing head body, wherein the sealing head body comprises a guide body and a sealing body; the guide body is of a cylindrical structure, and the sealing body comprises a first conical sealing section and a cylindrical guide section; the first conical sealing section is coaxially and integrally connected with the guide body, and the diameter of the first conical sealing section is gradually reduced from one end close to the guide body to one end far away from the guide body; the cylindrical guide section and the first conical sealing section are coaxially and integrally connected with each other, one end of the guide body is far away from the cylindrical guide section, an arc transition section is arranged at the joint of the cylindrical guide section and the first conical sealing section, and a guide fillet is arranged on the edge of the sealing end face and the end face of the cylindrical guide section, which is far away from one end of the first conical sealing section, for the sealing end face. The invention designs the sealing stage of the sealing head into a cone shape, and the axial force on the sealing head acts on the die through the tube blank, thereby eliminating the axial force acting on the tube blank, further eliminating the local plastic deformation of the tube blank and improving the quality of a hydraulic forming piece.
Description
Technical Field
The invention relates to the technical field of metal pipe hydraulic forming processing, in particular to a hydraulic forming sealing head and a design method thereof.
Background
As shown in figure 1, the common hydroforming sealing head has a parallel structure of the sealing section, and the sealing head of the structure moves along the axial direction of a tube blank during sealing to extrude the tube blank, and finally, the end part of the tube blank is locally plastically deformed to form the seal. However, in this sealing method, when the lengths of the tube blanks are not consistent, for a longer tube blank, as shown in fig. 2, the tube blank is extruded too much during the sealing process, and large local plastic deformation is easily generated, and the deformation is difficult to eliminate in the hydraulic forming process, so that the quality of the finished product is reduced; when the perpendicularity of the pipe end face with respect to the axis of the pipe blank is poor, as shown in fig. 3, it is difficult to form a reliable seal.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a hydraulic forming sealing head and a design method thereof.
The invention provides a hydraulic forming sealing head which comprises a sealing head body, wherein the sealing head body comprises a guide body and a sealing body; the guide body is of a cylindrical structure, and the sealing body comprises a first conical sealing section and a cylindrical guide section; the first conical sealing section is coaxially and integrally connected with the guide body, and the diameter of the first conical sealing section is gradually reduced from one end close to the guide body to one end far away from the guide body; the cylindrical guide section and the first conical sealing section are coaxially and integrally connected with each other, one end of the guide body is far away from the cylindrical guide section, an arc transition section is arranged at the joint of the cylindrical guide section and the first conical sealing section, and a guide fillet is arranged on the edge of the sealing end face and the end face of the cylindrical guide section, which is far away from one end of the first conical sealing section, for the sealing end face.
Preferably, the diameter of the lower bottom surface of the first conical sealing section is smaller than that of the guide body, and an annular thrust surface is formed on the end surface of the guide body close to one end of the first conical sealing section.
Preferably, the diameter of the cylindrical guide section is equal to the diameter of the upper bottom surface of the first conical sealing section.
Preferably, the sealing structure further comprises a forming die, wherein the forming die is provided with an inlet and outlet hole matched with the sealing body, the inlet and outlet hole comprises a first cylindrical sealing section, a second conical sealing section and a second cylindrical sealing section which are sequentially arranged along the depth direction of the inlet and outlet hole, the diameter of the lower bottom surface of the second conical sealing section is equal to the inner diameter of the first cylindrical sealing section, and the diameter of the upper bottom surface of the second conical sealing section is equal to the inner diameter of the second cylindrical sealing section; the inner diameter of the first cylindrical sealing section is equal to the outer diameter of the guide body, and the second conical sealing section is in clearance fit with the first conical sealing section.
Preferably, the taper angle of the first tapered sealing section is equal to the taper angle of the second tapered sealing section.
Preferably, the height h1 of the first conical sealing section is smaller than the height h2 of the second conical sealing section, and the difference between h1 and h2 is 3-5mm.
Preferably, still include water injection pole and connecting screw, sealed head body is seted up and is run through the countersunk screw hole that extends to its inside from sealed terminal surface, and the water injection pole is provided with the connection screw, and connecting screw passes countersunk screw hole and stretches into in the connection screw hole with water injection pole threaded connection, the water injection pole be provided with the water injection hole of connecting the screw intercommunication, connecting screw runs through and sets up the perforating hole with the water injection hole intercommunication.
Preferably, the seal body is kept away from the terminal surface of sealing end face one end and is offered the step hole coaxial and the intercommunication with the countersunk screw hole, and the step hole includes big footpath section and path section, and big footpath section setting is kept away from countersunk screw hole one side in the path section, and water injection rod tip is provided with the connection platform that passes big footpath section and stretch into in the path section, is provided with the suit in the big footpath section and connects the bench sealing washer.
Preferably, the second conical sealing section is in circular arc transition with the joint of the second conical sealing section and the second cylindrical sealing section.
The invention further provides a taper angle alpha design method of the first taper seal section in the hydraulic forming seal head, which comprises the following steps:
s1, calculating the minimum cone angle min (alpha) based on the formula (1),
wherein: f1Is the mold clamping force in the unit of N; p is hydroforming pressure in MPa; a is the projected area of the hydroformed part in mm2：F2The unit N is the thrust of a hydro-cylinder of the hydraulic forming sealing head; theta is the friction angle between the sealing head and the pipe fitting, theta = tan-1Mu; mu is the friction coefficient between the sealing head and the pipe fitting;
s2, judging whether the minimum cone angle min (alpha) is reasonable or not; if min (alpha) belongs to (0 degrees, 90 degrees), the minimum cone angle is reasonable, and S3 is executed; otherwise, adjusting the clamping force F1Or hydro-forming sealing head cylinder thrust F2And executing S1;
s3, designing the offset distance L between the outer contour line of the flared tube blank and the end contour line of the original tube blank based on the formula (2)1
Wherein: l is1The offset distance of the outer edge contour line of the pipe blank after flaring relative to the outer edge contour line of the original pipe blank is in unit mm; l is a radical of an alcohol2The effective sealing length of the sealing head is in unit mm;
s4, calculating the maximum taper angle max (alpha) based on the formula (3)
Wherein: epsilonbElongation at break (mm/mm) of the pipe; c1The perimeter of the contour line of the outer edge of the pipe blank after flaring is in unit mm; c0The perimeter of the contour line of the outer edge of the original tube blank is unit mm; the lambda safety factor ranges from 1.05 to 1.25;
s5, judging whether the minimum cone angle min (alpha) and the maximum cone angle max (alpha) are reasonable or not; if min (alpha) is more than or equal to max (alpha), reasonably executing S6; otherwise, adjusting the clamping force F1Or hydro-forming sealing head cylinder thrust F2And adjust L1Or L2Then executing S1;
s6, selecting an appropriate taper angle alpha between min (alpha) and max (alpha).
According to the hydraulic forming sealing head provided by the invention, a guide fillet is designed between the cylindrical guide section and the sealing end surface, so that the sealing head body can be smoothly inserted into a pipe blank; the sealing body of the sealing head body is provided with a first conical sealing section, the first conical sealing section axially extrudes the tube blank to expand the end part of the tube blank into a cone shape, and at the moment, the first conical sealing section is tightly attached to the end part of the tube blank and the end part of the tube blank is tightly attached to the second conical sealing section of the forming die to form good sealing; the connection part of the first conical sealing section and the cylindrical guide section is provided with an arc transition section which is beneficial to the material flow of the tube blank; the invention designs the sealing stage of the sealing head into a cone shape, has low requirements on the length consistency of the tube blank and the perpendicularity of the end face and the axis of the tube blank, is suitable for tube blanks with various section shapes, and the axial force on the sealing head acts on a die through the tube blank, thereby eliminating the axial force acting on the tube blank, avoiding the tube blank from generating larger plastic deformation while ensuring effective sealing, improving the quality of a hydraulic forming piece, and solving the problems of larger local plastic deformation and poor sealing caused by the extrusion of the tube blank by the sealing head in a hydraulic forming process.
Drawings
FIG. 1 is a schematic sealing diagram of a prior art hydroformed sealing head;
FIG. 2 is a schematic diagram of a conventional hydroformed sealing head sealing a relatively long tubular blank;
FIG. 3 is a schematic diagram of a conventional hydroforming head sealing a tube blank having an end face with poor perpendicularity relative to the axis of the tube blank;
FIG. 4 is a schematic structural view of a hydroformed sealing head according to the present invention;
FIG. 5 is an enlarged view taken at A in FIG. 4;
FIG. 6 is a schematic structural diagram of a sealing head body in a hydraulic forming sealing head according to the present invention;
FIG. 7 is a sealing schematic of a hydroformed sealing head according to the present invention;
FIG. 8 is a schematic view of a connection screw of a hydraulically formed seal head according to the present invention;
FIG. 9 is a view of a portion of a forming die in a hydraulic forming head according to the present invention;
FIG. 10 is a comparison of the contour line of the outer edge of the pipe blank after flaring and the contour line of the outer edge of the original pipe blank according to the present invention;
fig. 11 is a flow chart of a method for designing a hydroformed sealing head according to the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanying figures of the present invention are described in detail below, and it is apparent that the described embodiments are a part, not all or all of the embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making creative efforts based on the embodiments of the present invention, shall fall within the protection scope of the present invention.
With reference to fig. 4 to 9, the present invention proposes a hydroforming sealing head comprising a sealing head body 1 and a forming die 2, wherein:
the sealing head body 1 comprises a guide body 1-1 and a sealing body 1-2. The guide body 1-1 is in a cylindrical structure, and the sealing body 1-2 comprises a first conical sealing section 1-21 and a cylindrical guide section 1-22. The first conical sealing section 1-21 is coaxially and integrally connected with the guide body 1-1, the diameter of the first conical sealing section 1-21 is gradually reduced from one end close to the guide body 1-1 to one end far away from the guide body 1-1, the diameter of the lower bottom surface of the first conical sealing section 1-21 is smaller than that of the guide body 1-1, and the end surface of one end, close to the first conical sealing section 1-21, of the guide body 1-1 forms an annular thrust surface 1-11. The cylindrical guide section 1-22 and one end of the first conical sealing section 1-21 far away from the guide body 1-1 are coaxially and integrally connected, the diameter of the cylindrical guide section 1-22 is equal to the diameter of the upper bottom surface of the first conical sealing section 1-21, an arc transition section 1-23 is arranged at the joint of the cylindrical guide section 1-22 and the first conical sealing section 1-21, the end surface of the cylindrical guide section 1-22 far away from one end of the first conical sealing section 1-21 is a sealing end surface 1-24, and the edge of the sealing end surface 1-24 is provided with a guide fillet 1-25.
The forming die 2 is provided with an inlet and outlet hole 2-1 matched with the sealing body 1-2 body, the inlet and outlet hole 2-1 comprises a first cylindrical sealing section 2-11, a second conical sealing section 2-12 and a second cylindrical sealing section 2-13 which are sequentially arranged along the depth direction, the joint of the second conical sealing section 2-12 and the second cylindrical sealing section 2-13 is in arc transition, the diameter of the lower bottom surface of the second conical sealing section 2-12 is equal to the inner diameter of the first cylindrical sealing section 2-11, and the diameter of the upper bottom surface of the second conical sealing section 2-12 is equal to the inner diameter of the second cylindrical sealing section 2-13. The inner diameter of the first cylindrical sealing section 2-11 is equal to the outer diameter of the guide body 1-1, and the second conical sealing section 2-12 is in clearance fit with the first conical sealing section 1-21.
In the embodiment, guide fillets 1-25 are designed between the cylindrical guide sections 1-22 and the sealing end faces 1-24, so that the sealing head body 1 can be smoothly inserted into the tube blank a; the sealing body 1-2 of the sealing head body 1 is provided with a first conical sealing section 1-21 which expands the end part of the tube blank a into a cone, and at the moment, the first conical sealing section 1-21 is tightly attached to the end part of the tube blank a and the second conical sealing section 2-12 of the forming mould 2 to form sealing; the circular arc transition sections 1-23 are arranged at the joints of the first conical sealing sections 1-21 and the cylindrical guide sections 1-22, so that the material flow of the tube blank a is facilitated.
In this embodiment, the taper angle of the first tapered seal segments 1-21 is equal to the taper angle of the second tapered seal segments 2-12. The height h1 of the first conical sealing section 1-21 is smaller than the height h2 of the second conical sealing section 2-12, and the difference between h1 and h2 is 3-5mm. The tight fit between the first conical sealing sections 1-21 and the end part of the tube blank a and between the end part of the tube blank a and the second conical sealing sections 2-12 of the forming die 2 is ensured, and good sealing is formed.
Further, please refer to fig. 4, fig. 6, and fig. 8, further comprising a water injection rod 3 and a connection screw 4, wherein the sealing head body 1 is provided with a countersunk screw hole 1-3 extending from the self-sealing end surface 1-24 to the inside thereof, the water injection rod 3 is provided with a connection screw hole, the connection screw 4 passes through the countersunk screw hole 1-3 and extends into the connection screw hole to be in threaded connection with the water injection rod 3, the water injection rod 3 is provided with a water injection hole 3-1 communicated with the connection screw hole, and the connection screw 4 is provided with a through hole 4-1 communicated with the water injection hole 3-1. The center of the sealing head body 1 is provided with a countersunk screw hole 1-3, a connecting screw 4 penetrates through the countersunk screw hole 1-3 to connect the sealing head body 1 and the water injection rod 3, and the center of the connecting screw 4 is provided with a through hole 4-1, so that hydraulic forming liquid can conveniently flow into the pipe blank a.
Further, referring to fig. 4, 6 and 8, a stepped hole 1-4 coaxial with and communicated with the countersunk screw hole 1-3 is formed in the end face of the sealing body 1-2, which is far away from one end of the sealing end face 1-24, the stepped hole 1-4 comprises a large-diameter section and a small-diameter section, the large-diameter section is arranged on the side, away from the countersunk screw hole 1-3, of the small-diameter section, a connecting table penetrating through the large-diameter section and extending into the small-diameter section is arranged at the end of the water injection rod 3, and a sealing ring 1-5 sleeved on the connecting table is arranged in the large-diameter section. The sealing head body 1 is provided with step holes 1-4 for mounting and positioning the sealing head body 1 and the water injection rod 3, and the sealing rings 1-5 are mounted at the step holes 1-4 for sealing between the sealing head body 1 and the water injection rod 3.
The working principle of the invention is as follows: when the hydraulic forming process is started, the sealing head body 1 is contacted with the tube blank a, the tail end of the tube blank a is contacted with the sealing head body 1 along with the axial movement of the sealing head body 1, and the sealing head body 1 is provided with first conical sealing sections 1-21, so that the tube blank a is gradually expanded to form a cone; finally, the tube blank a and the first conical sealing sections 1-21 of the sealing head body 1 and the tube blank a and the second conical seals 2-12 of the hydraulic forming die 2 are in close contact, and good sealing is formed. The invention designs the sealing stage of the sealing head into a cone shape, and the axial force on the sealing head acts on the die through the tube blank, thereby eliminating the axial force acting on the tube blank, further eliminating the local plastic deformation of the tube blank and improving the quality of a hydraulic forming piece.
In the design of the conical sealing head, the size of the conical angle of the conical sealing head is a key design factor; the taper angle is too small, so that the upper die and the lower die can be jacked open in the sealing process, the die assembly is poor, and the quality of a final finished product is influenced; the excessive taper angle can lead to the pipe mouth cracking of the pipe blank, and influence the sealing effect and the quality of the finished product. The invention also provides a design method of the taper angle of the first taper sealing section in the hydraulic forming sealing head based on two risks in the use process of the taper sealing head.
Referring to fig. 11, the method for designing the taper angle of the first tapered sealing section in the hydraulic forming sealing head according to the present invention includes the following steps:
s1, calculating the minimum cone angle min (alpha) based on the formula (1),
wherein: f1Is the clamping force in N; p is hydroforming pressure in MPa; a is the projected area of the hydroformed part in mm2：F2Thrust of a hydraulic forming sealing head oil cylinder is expressed by N; theta is the friction angle between the sealing head and the pipe fitting, theta = tan-1Mu; mu is the friction coefficient between the sealing head and the pipe fitting;
s2, judging whether the minimum cone angle min (alpha) is reasonable or not; if min (alpha) belongs to (0 degrees, 90 degrees), the minimum cone angle is reasonable, and S3 is executed; otherwise, adjusting the clamping force F1Or hydro-forming sealing head cylinder thrust F2And executing S1;
s3, designing the offset distance L between the outer contour line of the flared tube blank and the port contour line of the original tube blank based on the formula (2)1
Wherein: l is a radical of an alcohol1The offset distance of the outer edge contour line of the flared tube blank relative to the outer edge contour line of the original tube blank is unit mm; l is2The effective sealing length of the sealing head is unit mm;
s4, calculating the maximum taper angle max (alpha) based on the formula (3)
Wherein: epsilonbElongation at break (mm/mm) of the pipe; c1The perimeter of the contour line of the outer edge of the pipe blank after flaring is in unit mm; c0The perimeter of the contour line of the outer edge of the original tube blank is unit mm; the lambda safety factor ranges from 1.05 to 1.25;
s5, judging whether the minimum cone angle min (alpha) in the step S1 and the maximum cone angle max (alpha) in the step S4 are reasonable or not; if min (alpha) is more than or equal to max (alpha), reasonably executing S6; otherwise, adjusting the clamping force F1Or hydro-forming sealing head cylinder thrust F2And adjust L1Or L2Then executing S1;
s6, selecting a proper taper angle alpha between min (alpha) and max (alpha).
The sealing head designed by the design method can effectively avoid the phenomenon that the upper die and the lower die are pushed open by the sealing head in the sealing process, and can effectively avoid the phenomenon of cracking of the edge of the tube blank caused by flaring.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. The hydraulic forming sealing head is characterized by comprising a sealing head body (1), wherein the sealing head body (1) comprises a guide body (1-1) and a sealing body (1-2); the guide body (1-1) is of a cylindrical structure, and the sealing body (1-2) comprises a first conical sealing section (1-21) and a cylindrical guide section (1-22); the first conical sealing section (1-21) is coaxially and integrally connected with the guide body (1-1), and the diameter of the first conical sealing section (1-21) is gradually reduced from one end close to the guide body (1-1) to one end far away from the guide body (1-1); the end face of the cylindrical guide section (1-22), which is far away from one end of the guide body (1-1), is a sealing end face (1-24), and the edge of the sealing end face (1-24) is provided with a guide round angle (1-25).
2. Hydroforming head according to claim 1, characterized in that the diameter of the lower base of the first conical sealing section (1-21) is smaller than the diameter of the guide body (1-1), the end face of the guide body (1-1) near one end of the first conical sealing section (1-21) forming an annular thrust surface (1-11).
3. Hydroforming head according to claim 1, characterized in that the diameter of the cylindrical guide section (1-22) is equal to the diameter of the upper base of the first conical sealing section (1-21).
4. The hydroforming seal head according to any one of claims 1 to 3, further comprising a forming die (2), wherein the forming die (2) is provided with an access hole (2-1) adapted to the body of the seal body (1-2), the access hole (2-1) comprises a first cylindrical seal section (2-11), a second cylindrical seal section (2-12) and a second cylindrical seal section (2-13) which are arranged in sequence along the depth direction, the diameter of the lower bottom surface of the second cylindrical seal section (2-12) is equal to the inner diameter of the first cylindrical seal section (2-11), and the diameter of the upper bottom surface of the second cylindrical seal section (2-12) is equal to the inner diameter of the second cylindrical seal section (2-13); the inner diameter of the first cylindrical sealing section (2-11) is equal to the outer diameter of the guide body (1-1), and the second conical sealing section (2-12) is in clearance fit with the first conical sealing section (1-21).
5. Hydroforming head according to claim 4, characterized in that the taper angle of the first conical sealing section (1-21) is equal to the taper angle of the second conical sealing section (2-12).
6. Hydroforming sealing head according to claim 4, characterized in that the height h1 of the first conical sealing section (1-21) is smaller than the height h2 of the second conical sealing section (2-12), the difference between h1 and h2 being 3-5mm.
7. The hydroformed seal head according to any of claims 1 to 3, further comprising a water injection rod (3) and a connecting screw (4), wherein the seal head body (1) is provided with a countersunk screw hole (1-3) extending through the self-sealing end face (1-24) to the inside thereof, the water injection rod (3) is provided with a connecting screw hole, the connecting screw (4) passes through the countersunk screw hole (1-3) and extends into the connecting screw hole to be in threaded connection with the water injection rod (3), the water injection rod (3) is provided with a water injection hole (3-1) communicated with the connecting screw hole, and the connecting screw (4) is provided with a through hole (4-1) communicated with the water injection hole (3-1) in a penetrating manner.
8. The hydroformed sealing head according to claim 7, characterized in that the end face of the body of the sealing body (1-2) remote from the sealing end face (1-24) is provided with a stepped hole (1-4) coaxial and communicating with the countersunk screw hole (1-3), the stepped hole (1-4) comprises a large diameter section and a small diameter section, the large diameter section is arranged at the side of the small diameter section remote from the countersunk screw hole (1-3), the end of the water injection rod (3) is provided with a connecting platform extending into the small diameter section through the large diameter section, and the large diameter section is provided with a sealing ring (1-5) sleeved on the connecting platform.
9. Hydroforming head according to claim 4, characterized in that the second conical sealing section (2-12) merges with the second conical sealing section (2-13) in a circular arc transition.
10. A method of designing a hydroformed sealing head according to claims 1 to 9, characterized in that the taper angle a design of the first tapered sealing section (1-21) comprises the following steps:
s1, calculating a minimum cone angle min (alpha) based on a formula (1),
wherein: f1Is the mold clamping force in the unit of N; p is hydroforming pressure in MPa; a is the projected area of the hydroformed part in mm2：F2The unit N is the thrust of a hydro-cylinder of the hydraulic forming sealing head; theta is the friction angle between the sealing head and the pipe fitting, theta = tan-1Mu, mu; mu is the friction coefficient between the sealing head and the pipe fitting;
s2, judging whether the minimum cone angle min (alpha) is reasonable or not; if min (alpha) belongs to (0 degrees, 90 degrees), the minimum cone angle is reasonable, and S3 is executed; otherwise, adjusting the clamping force F1Or hydro-forming sealing head cylinder thrust F2And executing S1;
s3, designing the offset distance L between the outer contour line of the flared tube blank and the end contour line of the original tube blank based on the formula (2)1
Wherein: l is1The offset distance of the outer edge contour line of the pipe blank after flaring relative to the outer edge contour line of the original pipe blank is in unit mm; l is a radical of an alcohol2The effective sealing length of the sealing head is unit mm;
s4, calculating the maximum taper angle max (alpha) based on the formula (3)
Wherein: epsilonbElongation at break (mm/mm) of the pipe; c1The perimeter of the contour line of the outer edge of the pipe blank after flaring is in unit mm; c0The perimeter of the contour line of the outer edge of the original tube blank is unit mm; the lambda safety factor ranges from 1.05 to 1.25;
s5, judging whether the minimum cone angle min (alpha) and the maximum cone angle max (alpha) are reasonable or not; if min (alpha) is more than or equal to max (alpha), reasonably executing S6; otherwise unreasonable and adjustedIntegral clamping force F1Or hydro-forming sealing head cylinder thrust F2And adjust L1Or L2Then executing S1;
s6, selecting an appropriate taper angle alpha between min (alpha) and max (alpha).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210784253.7A CN115255107A (en) | 2022-07-05 | 2022-07-05 | Hydraulic forming sealing head and design method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210784253.7A CN115255107A (en) | 2022-07-05 | 2022-07-05 | Hydraulic forming sealing head and design method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115255107A true CN115255107A (en) | 2022-11-01 |
Family
ID=83763712
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210784253.7A Pending CN115255107A (en) | 2022-07-05 | 2022-07-05 | Hydraulic forming sealing head and design method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115255107A (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0623441A (en) * | 1992-02-19 | 1994-02-01 | Sango Co Ltd | Method for sealing end part in hydraulic bulging work |
| JP2004160537A (en) * | 2002-09-19 | 2004-06-10 | Sumitomo Metal Ind Ltd | Reducing tube stock for bulging, method for manufacturing hydrostatic bulging die and reducing tube stock, hydrostatic bulging device, hydrostatic bulging method for reducing tube, and bulged article |
| CN101259501A (en) * | 2008-04-18 | 2008-09-10 | 哈尔滨工业大学 | Tubular product internal high-pressure forming special-shaped cross section sealing method and sealing punch |
| CN201461590U (en) * | 2009-06-22 | 2010-05-12 | 宝山钢铁股份有限公司 | Sectional sealing head mechanism for hydraulic forming of pipes |
| CN202097262U (en) * | 2011-06-02 | 2012-01-04 | 佛山市南海兴迪机械制造有限公司 | Push head structure for sealing pipe end of novel tube stock liquid charging forming pipe |
| CN106853473A (en) * | 2016-12-06 | 2017-06-16 | 柳州科瑞科技有限公司 | A kind of zigzag for forming high pressure in pipe is cut somebody's hair |
| CN106862360A (en) * | 2017-01-16 | 2017-06-20 | 柳州科瑞科技有限公司 | A kind of internal high pressure forming of embedded occlusion sealing structure is cut somebody's hair |
| CN208083148U (en) * | 2018-03-27 | 2018-11-13 | 勋龙智造精密应用材料（苏州）股份有限公司 | A kind of staged ram head for pipe end high pressure sealing |
| KR20210106683A (en) * | 2020-02-21 | 2021-08-31 | 주식회사 세교텍 | Hydroforming Molding Device for Air Suspension Cylinder Forming |
| CN214719748U (en) * | 2020-07-28 | 2021-11-16 | 隆昌山川机械有限责任公司 | Profiling pushing head of hydraulic forming die |
| CN215391878U (en) * | 2021-07-26 | 2022-01-04 | 佛山市永恒液压机械有限公司 | Pipe forming punch and pipe forming equipment are pressed to card |
-
2022
- 2022-07-05 CN CN202210784253.7A patent/CN115255107A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0623441A (en) * | 1992-02-19 | 1994-02-01 | Sango Co Ltd | Method for sealing end part in hydraulic bulging work |
| JP2004160537A (en) * | 2002-09-19 | 2004-06-10 | Sumitomo Metal Ind Ltd | Reducing tube stock for bulging, method for manufacturing hydrostatic bulging die and reducing tube stock, hydrostatic bulging device, hydrostatic bulging method for reducing tube, and bulged article |
| CN101259501A (en) * | 2008-04-18 | 2008-09-10 | 哈尔滨工业大学 | Tubular product internal high-pressure forming special-shaped cross section sealing method and sealing punch |
| CN201461590U (en) * | 2009-06-22 | 2010-05-12 | 宝山钢铁股份有限公司 | Sectional sealing head mechanism for hydraulic forming of pipes |
| CN202097262U (en) * | 2011-06-02 | 2012-01-04 | 佛山市南海兴迪机械制造有限公司 | Push head structure for sealing pipe end of novel tube stock liquid charging forming pipe |
| CN106853473A (en) * | 2016-12-06 | 2017-06-16 | 柳州科瑞科技有限公司 | A kind of zigzag for forming high pressure in pipe is cut somebody's hair |
| CN106862360A (en) * | 2017-01-16 | 2017-06-20 | 柳州科瑞科技有限公司 | A kind of internal high pressure forming of embedded occlusion sealing structure is cut somebody's hair |
| CN208083148U (en) * | 2018-03-27 | 2018-11-13 | 勋龙智造精密应用材料（苏州）股份有限公司 | A kind of staged ram head for pipe end high pressure sealing |
| KR20210106683A (en) * | 2020-02-21 | 2021-08-31 | 주식회사 세교텍 | Hydroforming Molding Device for Air Suspension Cylinder Forming |
| CN214719748U (en) * | 2020-07-28 | 2021-11-16 | 隆昌山川机械有限责任公司 | Profiling pushing head of hydraulic forming die |
| CN215391878U (en) * | 2021-07-26 | 2022-01-04 | 佛山市永恒液压机械有限公司 | Pipe forming punch and pipe forming equipment are pressed to card |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102825161B (en) | The manufacture method of cylinder apparatus | |
| CN102554009B (en) | Fluid pressure forming method for small-radius elbow | |
| JP5221910B2 (en) | Pipe expansion method | |
| CN204953710U (en) | Pipe fitting throat mold processing | |
| CN105598265A (en) | Overall forming method of small-relative-bending-radius and large-diameter-thickness-ratio thin-walled bent pipe fitting | |
| CN106180280A (en) | A kind of for heavy caliber seamless steel pipe end diameter-setting equipment and method | |
| CN112975308B (en) | Processing technology for extrusion molding of pipe end with sealing groove | |
| JP2006272350A (en) | Punch for diametrically eccentrically enlarging work and production method of diametrically eccentrically enlarged pipe | |
| CN104550289A (en) | Multi-male-die one-time extrusion forming method for spatial bending pipe | |
| CN108787845B (en) | Hydraulic forming device for large-diameter thin-wall metal pipe fitting | |
| CN103008478A (en) | Hydraulic punching and flanging mould used for interior high-pressure forming member | |
| CN115255107A (en) | Hydraulic forming sealing head and design method thereof | |
| CN204338600U (en) | Conical pipe cold-extrusion shaping device | |
| CN204412904U (en) | A kind of preformed drift of punching flanging bore on high-strength steel sheet | |
| CN102601203A (en) | Device for improving plate forming limit and method for improving plate forming limit by aid of device | |
| CN111957804B (en) | Device for liquid-filling bending forming of thin-walled tube and forming method thereof | |
| CN210907441U (en) | Forming die assembly for inner and outer reducing pipe fittings | |
| CN111299979B (en) | Preparation process of cold extrusion piston tube | |
| CN111112431B (en) | Method for liquid-filled extrusion forming and blade obtained thereby | |
| CN105537306A (en) | Method and pipe blank for reducing metal tearing area at tail end of extruded pipe | |
| CN102744343B (en) | Forging method of thin-wall drill bit and through diameter reducing die | |
| CN104550287A (en) | Cold extrusion moulding device for tapered pipe | |
| CN204018470U (en) | The hydraulic pressure pwc building mortion of complex pipes | |
| CN213915659U (en) | Internal high-pressure forming pushing head device | |
| CN111085590A (en) | Deep conical part precision forming process method |
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 |