CN111346980A - Pipe joint rolling connection forming tool and rolling connection process based on high filling rate - Google Patents
Pipe joint rolling connection forming tool and rolling connection process based on high filling rate Download PDFInfo
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- CN111346980A CN111346980A CN202010237402.9A CN202010237402A CN111346980A CN 111346980 A CN111346980 A CN 111346980A CN 202010237402 A CN202010237402 A CN 202010237402A CN 111346980 A CN111346980 A CN 111346980A
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- 238000000034 method Methods 0.000 title claims abstract description 29
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- 238000003780 insertion Methods 0.000 claims abstract description 4
- 230000037431 insertion Effects 0.000 claims abstract description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 6
- 239000000956 alloy Substances 0.000 claims description 6
- 238000010923 batch production Methods 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 5
- 238000005493 welding type Methods 0.000 claims description 4
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 3
- 229910000997 High-speed steel Inorganic materials 0.000 claims description 3
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- 238000013461 design Methods 0.000 abstract description 3
- 230000014509 gene expression Effects 0.000 abstract description 2
- 238000012797 qualification Methods 0.000 abstract 1
- 238000007789 sealing Methods 0.000 description 8
- 238000012545 processing Methods 0.000 description 4
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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
- B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
- B21D39/04—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes with tubes; of tubes with rods
- B21D39/046—Connecting tubes to tube-like fittings
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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
- B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
- B21D43/003—Positioning devices
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Abstract
The invention provides a pipe joint rolling connection forming tool based on a high filling rate and a rolling connection process. The tool comprises an inner diameter expander and a clamping die; the method is characterized in that: the mandrel which is sleeved in the mandrel sleeve in the inner diameter expander and used for implementing rolling rotation is of a split structure and is divided into a working end and a non-working end; the working end is a part which is used for inserting the core rod into the metal guide pipe to perform rolling rotation by matching with the core rod sleeve during working, and is provided with a cone structure, and the outer diameter of the working end is gradually reduced in the direction pointing to the insertion direction; the taper of the working end of the core rod meets a certain relational expression. The rolling process is characterized in that the high-hardness and smooth roller pins are in contact with the inner wall of the metal conduit by adopting the tool, so that the surface layer of the metal conduit is subjected to local plastic deformation to generate surface compressive stress, and the rolling connection is realized after the material of the conduit wall rolls into the pipe joint with the groove. The invention has the advantages of reasonable structural design, improved performance of rolled finished products, high qualification rate and the like.
Description
Technical Field
The invention relates to the technical field of pipe forming processing equipment, in particular to a pipe joint rolling connection forming tool and a rolling connection process based on high filling rate.
Background
At present, the connection mode of the airplane guide pipe mainly comprises a flaring connection mode and a rolling connection mode, and the flaring connection mode has the defects that the shape error and the surface roughness error generated in the manufacturing process are difficult to eliminate, the sealing performance is poor, the self-locking performance is poor, a fuse is usually locked, and the weight of the airplane is greatly increased due to the large area of the sealing surface of the flaring connection mode. In contrast, the roll joining process has certain advantages.
The rolling connection process has the characteristics of high sealing performance, light weight, shock resistance, self locking, no need of safety, convenience in maintenance and the like, is widely applied to foreign airplanes, is a mature and reliable connection technology, and solves the problem of leakage of high-pressure catheters by utilizing a self-sealing principle that the higher the pressure is, the better the sealing is, after the pipe joint and the catheters are connected in a rolling manner.
However, the rolling connection process has some defects due to the influence of some factors, the invention mainly researches the influence of the rolling filling rate on the rolling process, and the influence of the filling rate on the rolling forming quality is specifically as follows:
1. the rolling filling rate is insufficient, the appropriate gradient of the maximum effective rolling area and the thinning of the plastic deformation wall thickness of the conduit cannot be achieved, and the compressive stress of the inner surface of the conduit and the contact stress of the outer surface of the conduit are insufficient, so that the bending fatigue performance is unqualified.
2. The rolling filling rate is insufficient, the combination with the pipe joint is obviously not tight, namely the contact stress between the outer wall of the conduit and the pipe joint is insufficient, the sealing effect cannot be achieved, oil leakage can occur, and the air tightness and pressure resistance are unqualified.
3. The rolling filling rate is not enough, the filling of the conduit material in the groove of the pipe joint is less, the axial resistance is small when the pipe is axially stretched, and the conduit can be broken or leaked, so that the connection strength performance is unqualified.
Therefore, how to design a roll-bonding forming tool and a roll-bonding process are the key to ensure the quality of roll-bonding forming, and become the problem to be solved at present.
Disclosure of Invention
According to the technical problems of oil leakage, fracture, poor connection strength and the like of the conduit caused by insufficient filling rate of the rolling connection process, the high-filling-rate-based pipe joint rolling connection forming tool and the rolling connection process are provided. The invention mainly adopts a split structure and the matching of the core rod with a certain taper and the core rod sleeve, and feeds back the core rod to the rolling process by controlling the shearing rate in the rolling process, so that the rolled conduit and the pipe joint have higher filling rate, various connection performance indexes of the conduit and the pipe joint are improved, and high-quality assessment standards are met.
The technical means adopted by the invention are as follows:
a pipe joint rolling connection forming tool based on high filling rate comprises an inner diameter expander and a clamping die; the method is characterized in that:
the mandrel which is sleeved in the mandrel sleeve in the inner diameter expander and used for implementing rolling rotation is of a split structure and is divided into a working end and a non-working end; the working end is a part of the mandrel which is matched with the mandrel sleeve and used for being inserted into the metal guide pipe to perform rolling rotation during working, the working end is of a cone structure, and the outer diameter of the working end is gradually reduced in the direction pointing to the insertion direction;
the taper of the working end of the core rod is 2 α so as to meet the following requirements:
sinα＝(tf-t0)/2h
wherein α is rolling half cone angle with unit of degree tfThe inner diameter of the rolled conduit is mm; t is t0Rolling the inner diameter of the front guide pipe by mm; h is the length of the rolling part of the roller pin, mm, and the taper of the core rod can ensure the optimal rolling effect.
Furthermore, at least 3 rolling needles are equidistantly distributed between the working end of the mandrel and the mandrel sleeve along the circumferential direction of the mandrel, the rolling needles are arranged in an accommodating groove formed in the mandrel sleeve, and the distance from the front end of the accommodating groove to the front end of the mandrel sleeve is 5-10 mm.
Further, the axial direction of the roller pin forms an included angle with the axial direction of the mandrel, the roller pin is provided with a head part and a rolling part, the length of the roller pin is equal to or slightly greater than the length of the pipe joint, the diameter of the roller pin is equal to or slightly smaller than 1/3 of the nominal inner diameter of the metal guide pipe, the end faces of the two ends of the roller pin are provided with a rounding structure, and the rounding of the head part is greater than that of the tail part of the rolling part.
The inner diameter expander comprises a main body, wherein a thrust ball bearing, a stack spring and an adjusting nut are arranged in the main body to limit the mandrel sleeve in the main body, the tail end of the mandrel sleeve is locked through a set screw and a locking nut, the mandrel sleeve is arranged on the outer side of the mandrel, the mandrel can axially and relatively move in the mandrel sleeve, and the mandrel sleeve and the main body synchronously and axially move;
the spring gasket is arranged in a groove in the main body, close to one side of the working end of the mandrel, the spring gasket is axially positioned by a retainer ring for a hole, a spring is sleeved outside a mandrel sleeve part matched with the working end of the mandrel, one end of the spring is fixed in the spring gasket, the other end of the spring is embedded in a rubber ring, and when the spring naturally extends, the rubber ring is positioned outside the accommodating groove and blocks the roller pin.
Furthermore, the working end material of the core rod is different from the base material of the non-working end, and hard alloy which is not easy to wear during batch production is adopted.
Furthermore, the mandrel sleeve is of a V-shaped welding type structure or an integral type structure, when the V-shaped welding type structure is adopted, the left end of the mandrel sleeve, which is bounded by a V-shaped welding position, is used as a connecting section and is prepared from alloy steel, the right end of the mandrel sleeve is used as a working section, namely, the part matched with the working end of the mandrel is made of hard alloy or high-hardness die steel which ensures that the mandrel sleeve is not easily abraded in batch production, and the two parts are made of different materials, so that the service life of the mandrel sleeve can be ensured, and the working section is convenient to replace; the needle roller material is made of high-wear-resistance high-toughness powder high-speed steel.
Further, the clamping die comprises a positioning sleeve and a half clamping die; the positioning sleeve is integrated and used for fixing the pipe joint, the integrated structure eliminates the damage to the sealing surface of the pipe sleeve in the clamping process, and meanwhile, the uniformity and consistency of the pipe sleeve on the stressed supporting surface are guaranteed. The semi-clamping die is split and used for fixing the catheter positioning sleeve and the catheter, and meanwhile, certain reservation is reserved for the axial extension amount of the metal catheter in a rolling mode.
The invention also discloses a rolling connection process which is characterized in that the pipe joint and the metal conduit are rolled by adopting the pipe joint rolling connection forming tool based on the high filling rate, and the rolling connection process specifically comprises the following steps:
fixing a pipe joint to be connected with a metal conduit on a clamping die, wherein the pipe joint comprises a pipe sleeve or a light straight-through, the inner diameter expander is driven by a stepping shaft, the working end of a core rod is inserted into the metal conduit along with the core rod sleeve, a high-hardness and smooth roller pin is contacted with the inner wall of the metal conduit, the working end of the core rod rotates and advances to drive the roller pin distributed at equal intervals to be contacted with the inner wall of the conduit, so that the surface layer of the core rod is subjected to local plastic deformation to generate surface compressive stress, the wall material of the metal conduit is pressed into a groove of the pipe joint to achieve the maximum set torque of rolling, the outer wall of the metal conduit is subjected to contact stress with the pipe joint, and after the metal conduit is completely rolled in place.
After the conduit and the pipe joint are molded, the pipe joint generates elastic deformation, the conduit generates elastic deformation, part of materials generate plastic deformation, and the elastic recovery directions of the contact parts of the conduit and the pipe joint are opposite, so that the conduit and the pipe joint are tightly connected, the surface residual compressive stress is increased, and the fatigue performance is improved.
Further, the shear thinning rate phi of the metal conduit is controlled in the rolling processtThe diameter of the cut film is between 15 and 40 percenttSatisfies the following conditions:
фt＝(tf-t0)/2t×100％；
wherein, tfFor rolling the rear catheterInner diameter, mm; t is t0Rolling the inner diameter of the front guide pipe by mm; t is the nominal wall thickness of the catheter, mm.
Further, the amount of pressing in of the material of the pipe wall of the metal conduit is controlled to be larger than the filling amount of the material in the groove of the pipe joint in the rolling process, and the method specifically comprises the following steps:
π*D*h*sina(D+h*sinα)/2＞π*a1*b1*(D+b1)+π*a2*b2*(D+b2)
+π*a3*b3*(D+b3)
wherein, VGroove I＝π*a1*b1*(D+b1)；
VGroove II＝π*a2*b2*(D+b2)；
VGroove III＝π*a3*b3*(D+b3)；
a1, a2 and a3 are the groove widths of the three grooves respectively and are in mm;
b1, b2 and b3 are the groove depths of the three grooves respectively in mm;
d is the nominal outer diameter of the metal conduit in mm.
Compared with the prior art, the invention has the following advantages:
1. the core rod provided by the invention is of a split structure, is locked by the fastening screw, and is made of a base material different from a cone material, so that the service life of the core rod can be prolonged, and the rolling quality is improved.
2. The taper of the cone at the working end of the mandrel provided by the invention can ensure that the metal guide pipe material is rolled into the pipe joint with the groove to have better filling rate, and the rolling needles are ensured to smoothly enter the metal guide pipe without falling off.
3. The included angle is formed between the axial direction of the rolling needle and the axial direction of the core rod, so that the forward rotation of the expander can be automatically fed in the rolling process, and the slow and uniform axial flow and radial flow of metal conduit materials in the rolling process are ensured.
In summary, the rolling connection forming tool and the rolling process provided by the invention contact the high-hardness and smooth roller pins with the inner wall of the metal conduit, so that the surface layer of the metal conduit is subjected to local plastic deformation to generate surface compressive stress, and the conduit material is rolled into the pipe joint with the groove to realize rolling connection. According to the rolling connection process provided by the invention, when the safety coefficient n is considered to be 1.5, in order to ensure that a connection strength test is qualified, the filling rate of the pipe joint and the conduit after rolling forming is not lower than 80%.
For the reasons, the invention can be widely popularized in the field of pipe forming and processing equipment.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a sectional view of a pipe joint and a pipe after the pipe joint and the pipe are roll-formed by using the roll connection forming tool provided by the invention.
Fig. 2 is a schematic view illustrating the calculation of the volume of the rolled pipe joint groove in fig. 1.
Fig. 3 is a schematic diagram of a calculation mode of a rolling volume of a catheter.
FIG. 4 is a schematic view of the structure of the core rod sleeve and the holding groove of the present invention.
Fig. 5 is a schematic structural view of the needle roller of the present invention.
FIG. 6 is a schematic structural view of an inner diameter expander in the roll-bonding forming tool according to the present invention.
FIG. 7 is a schematic view of the roll-bonding molding tool according to the present invention in use.
FIG. 8 is a schematic view of the structure of the rolling connection forming tool of the present invention in which the clamping mold and the pipe sleeve are engaged.
Fig. 9 is a schematic structural view of the cooperation between the clamping die and the light through hole in the roll-bonding forming tool of the invention.
In the figure: 1. a core rod; 2. locking the nut; 3. tightening the screw; 4. a mandrel cover; 5. adjusting the nut; 6. folding the spring; 7. a main body; 8. a thrust ball bearing; 9. a spring washer; 10. a retainer ring for a bore; 11. a spring; 12. a rubber ring; 13. rolling needles; 14. a positioning sleeve; 15. half clamping a die; 16. pipe sleeve; 161. a groove I; 162. a groove II; 163. a groove III; 17. a metal conduit; 18. light straight-through.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. 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.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. Any specific values in all examples shown and discussed herein are to be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the absence of any contrary indication, these directional terms are not intended to indicate and imply that the device or element so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be considered as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
As shown in fig. 6 and 7, the invention provides a pipe joint roll-bonding forming tool based on high filling rate, which comprises an inner diameter expander and a clamping die; the inner diameter expander comprises a main body 7, wherein a thrust ball bearing 8, a stack spring 6 and an adjusting nut 5 are arranged in the main body 7, the mandrel sleeve 4 is limited in the main body 7, the tail end of the mandrel sleeve 4 is locked through a set screw 3 and a locking nut 2, the mandrel sleeve 4 is sleeved outside a mandrel 1, the mandrel 1 can move axially relative to each other in the mandrel sleeve 4, and the mandrel sleeve 4 and the main body 7 synchronously move axially; the adjusting nut 5 can be pre-tightened by the stack spring 6, the front and rear positions of the mandrel sleeve 4 can be adjusted by the adjusting nut 5, and the adjusting nut 5 is provided with threaded holes which are distributed at equal intervals; the locking nut 2 can define the position of the core rod 1, so that the core rod 1 can move in the core rod sleeve 4. The threaded hole is matched with the set screw 3 and used for adjusting the planes of the adjusting nut 5 and the core rod sleeve 4, so that the adjusting nut 5 rotates together with the core rod sleeve under the pressing force of the stack spring 6, and the internal thread of the adjusting nut 5 is matched with the external thread of the core rod sleeve 4, so that the core rod sleeve 4 is axially positioned. The mutual matching among the laminated spring 6, the adjusting nut 5 and the thrust ball bearing 8 ensures the fixation of the rolling tool, the axial direction is adjustable, and meanwhile, certain pretightening force is provided.
The spring gasket 9 is arranged in a groove on one side of the working end of the mandrel 1 in the main body 7, the spring gasket 9 is axially positioned by a retainer ring 10 for holes, a spring 11 is sleeved on the outer side of the mandrel sleeve 4 matched with the working end of the mandrel 1, one end of the spring 11 is fixed in the spring gasket 9, the other end of the spring 11 is embedded in a rubber ring 12, and when the spring 11 naturally extends, the rubber ring 12 is positioned on the outer side of the accommodating groove to block the roller pin 13.
The mandrel 1 which is sleeved in the mandrel sleeve 4 in the inner diameter expander and used for implementing rolling rotation is of a split structure and is divided into a working end and a non-working end; the working end material of the core rod 1 is different from the base material of the non-working end, and hard alloy which is not easy to wear during batch production, such as YL10.2, is adopted.
The working end is a part of the mandrel 1 which is matched with the mandrel sleeve 4 and used for being inserted into the metal guide pipe 17 to perform rolling rotation during working, the working end has a cone structure, and the outer diameter of the working end is gradually reduced in the direction pointing to the insertion direction; the taper of the cone ensures that the material of the guide tube 17 is well filled when being rolled into the tube joint (the tube sleeve 16 or the light straight-through 18) with the groove, and ensures that the roller pin 13 smoothly enters the guide tube 17 without falling off.
Wherein, the taper of the working end of the core rod 1 is 2 α to satisfy the following conditions:
sinα＝(tf-t0)/2h
wherein α is rolling half cone angle with unit of degree tfThe inner diameter of the rolled conduit is mm; t is t0Rolling the inner diameter of the front guide pipe by mm; h is the length of the rolling part of the roller pin 13, and mm.
At least 3 roller pins 13 are equidistantly distributed between the working end of the mandrel 1 and the mandrel sleeve 4 along the circumferential direction of the mandrel 1, the roller pins 13 are arranged in accommodating grooves formed in the mandrel sleeve 4, the distance from the front end of the accommodating groove to the front end of the mandrel sleeve 4 is 5-10mm, and the accommodating grooves can fix the roller pins 13 to play a role of a retainer (as shown in fig. 4). The holding tank of mandrel cover has the oblique angle, guarantees that the corotation of internal diameter expander can be from feeding when the roll extrusion, and axial flow and radial flow are slow, even when guaranteeing the roll extrusion of pipe material. Wherein, B1 is the inclination of holding tank, generally 2 ° -5 °, B2 and B3 are the length and the width of holding tank, and the unit is mm, and B2 and B3 adapt to length and the diameter of kingpin 13, and the clearance fit is selected to the cooperation relation, guarantees the free rotation of kingpin 13 in the holding tank.
The mandrel sleeve 4 is of a V-shaped welding structure, the welding position is preferably at a position about 10mm away from the accommodating groove, and the edge of the accommodating groove is prone to cracking due to the fact that abrasion is easily generated in the relative movement process of the edge of the accommodating groove and the roller pin 13. The core rod sleeve 4 is preferably made of alloy steel, such as 35CrMo and the like, by taking the V-shaped welding position as a boundary and taking the left end as a connecting section; the right end is a working section, namely, the part matched with the working end of the core rod 1 adopts hard alloy or high-hardness die steel which is difficult to wear during batch production, such as Cr12MoV and the like.
As shown in fig. 5, the axial direction of the needle roller 13 forms an included angle with the axial direction of the mandrel 1, and mainly plays a role in feeding the axial component of the rolling torque; the roller pin 13 has no taper, is a cylinder, and is provided with a head part R and a rolling part, wherein the length of the head part R does not participate in rolling and plays a transitional role, and the length of the rolling part is an effective length H (the length of the roller pin is H), so that effective rolling is realized; the length of the roller pin 13 is equal to or slightly greater than the length of the pipe joint, the diameter of the roller pin 13 is equal to or slightly less than 1/3 of the nominal inner diameter of the metal guide pipe 17, the end faces of two ends of the roller pin 13 are provided with a fillet structure, and the fillet R at the head part is greater than the fillet R at the tail part of the rolling part, so that sharp-edge indentation formed by rolling is avoided. The material of the needle roller 13 is high-wear-resistance high-toughness powder high-speed steel.
The clamping die comprises a positioning sleeve 14 and a half clamping die 15; the positioning sleeve 14 is integral and is used for fixing the pipe joint; the half clamping die 15 is split and used for fixing the guide pipe positioning sleeve 14 and the guide pipe 17, the damage to the sealing surface of the pipe joint in the clamping process is eliminated through the integral structure, and meanwhile, the uniformity and the consistency of the pipe joint on a stress supporting surface are guaranteed.
As shown in fig. 8 and 9, the metal conduit 17 is preset in the pipe sleeve 16 or the light straight-through 18, the pipe sleeve 16 is preset in the positioning sleeve 14 (the light straight-through 18 does not need the positioning sleeve 14), then the pipe sleeves are respectively put into the corresponding half clamping dies 15, and the other half clamping dies are locked by the clamp to complete clamping of the clamping dies and the pipe joint.
The invention also discloses a rolling connection process, which is used for rolling the pipe joint and the metal conduit by adopting the pipe joint rolling connection forming tool based on the high filling rate, and specifically comprises the following steps:
fixing a pipe joint which needs to be connected with a metal guide pipe 17 on a clamping die, wherein the pipe joint comprises a pipe sleeve 16 or a light straight-through 18, the inner diameter expander is driven by a stepping shaft, the working end of the core rod 1 is inserted into the metal guide pipe 17 along with the core rod sleeve 4, the high-hardness and smooth roller pins 13 are contacted with the inner wall of the metal guide pipe 17, the working end of the core rod 1 rotates and advances to drive the roller pins 13 which are equidistantly distributed to be contacted with the inner wall of the guide pipe, so that the surface layer of the core rod 1 is locally plastically deformed to generate surface compressive stress, the pipe wall material of the metal guide pipe 17 is pressed into a groove of the pipe joint to reach the maximum set torque of rolling, the outer wall of the metal guide pipe 17 is contacted with the pipe joint, and after all the rollers are.
The forming process comprises the following steps: the conduit material is subjected to the combined action of friction and rolling between the roller pins 13 and the pipe joint, namely, axial flow and radial flow exist, so that the conduit material is sheared to be thin, the conduit material is embedded into the grooves of the pipe joint, the larger the radial displacement of the roller pins 13 in a certain range is, the more the conduit material is embedded into the grooves, the radial displacement of the roller pins is controlled by input torque (driven by a motor), and the torque is related to the conduit material, the outer diameter, the wall thickness and the design structure of the pipe joint.
Thereby, the shear rate phi of the metal conduit 17 is controlled in the rolling processtThe intervention is between 15 percent and 40 percent, which is beneficial to improving the performance of the workpiece formed by rolling.
The shear thinning rate phitSatisfies the following conditions:
фt＝(tf-t0)/2t×100％；
wherein, tfThe inner diameter of the rolled conduit is mm; t is t0Rolling the inner diameter of the front guide pipe (namely the nominal inner diameter of the guide pipe) in mm; t is the nominal wall thickness of the catheter, mm.
As shown in fig. 1 to fig. 3, the amount of the pressed material of the pipe wall of the metal conduit 17 is controlled to be greater than the amount of the filled material in the groove of the pipe joint during the rolling process, so as not to cause over rolling and incomplete rolling, specifically:
π*D*h*sinα(D+h*sinα)/2＞π*a1*b1*(D+b1)+π*a2*b2*(D+b2)
+π*a3*b3*(D+b3)
wherein, VGroove I＝π*a1*b1*(D+b1)；
VGroove II＝π*a2*b2*(D+b2)；
VGroove III＝π*a3*b3*(D+b3)；
a1, a2 and a3 are the groove widths of three grooves (a groove I161, a groove II 162 and a groove III 163) respectively, and the unit is mm;
b1, b2 and b3 are the groove depths of the three grooves respectively in mm;
d is the nominal outer diameter of the metal conduit in mm.
Example 1
The filling volume V of the groove material of the pipe joint is pi x a1 b1 (D + b1) + pi x a2 b2 (D + b2) + pi x a3 b3 (D + b3), the pressing-in volume W of the conduit material is pi x D h sin α (D + h sin α)/2, the taper of the working end of the mandrel 1 is matched, W is larger than V, and the proper t is selectedfThe shear thinning rate is phitBetween 15 percent and 40 percent, h (effective length of the roller pin) is approximately equal to the length of the pipe joint, and the diameter of the roller pin is approximately equal to t0And/3, the taper of the core rod is 2 α, the rolling forming process can provide theoretical basis for rolling processing, and technological parameters are optimized.
The pipe sleeve 16 is made of stainless steel 15-5PH, the metal conduit 17 is made of titanium alloy Ti-3Al-2.5V, rolling forming is carried out, relevant material parameters of the pipe sleeve 16 and the metal conduit 17 are shown in table 1,
TABLE 1 relevant Material parameters
The rolling connection forming tool is adopted to finish the rolling processing of the titanium pipe and the stainless steel pipe, and the performance assessment requirement that multiple batches of multi-specification test pieces pass the HB5966 requirement can be obtained in order to ensure that the connection strength test is qualified when the safety coefficient n is 1.5 and the filling rate is not lower than 80%.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A pipe joint rolling connection forming tool based on high filling rate comprises an inner diameter expander and a clamping die; the method is characterized in that:
the mandrel which is sleeved in the mandrel sleeve in the inner diameter expander and used for implementing rolling rotation is of a split structure and is divided into a working end and a non-working end; the working end is a part of the mandrel which is matched with the mandrel sleeve and used for being inserted into the metal guide pipe to perform rolling rotation during working, the working end is of a cone structure, and the outer diameter of the working end is gradually reduced in the direction pointing to the insertion direction;
the taper of the working end of the core rod is 2 α so as to meet the following requirements:
sinα＝(tf-t0)/2h
wherein α is rolling half cone angle with unit of degree tfThe inner diameter of the rolled conduit is mm; t is t0Rolling the inner diameter of the front guide pipe by mm; h is the length of the rolling part of the roller pin, and mm.
2. The high-filling-rate-based pipe joint roll-connection forming tool is characterized in that at least 3 rolling needles are equidistantly distributed between the working end of the mandrel and the mandrel sleeve along the circumferential direction of the mandrel, the rolling needles are arranged in a containing groove formed in the mandrel sleeve, and the distance from the front end of the containing groove to the front end of the mandrel sleeve is 5-10 mm.
3. The high-filling-rate-based pipe joint roll-to-roll connection forming tool is characterized in that the axial direction of the roller pin forms an included angle with the axial direction of the mandrel, the roller pin is provided with a head portion and a rolled portion, the length of the roller pin is equal to or slightly greater than the length of the pipe joint, the diameter of the roller pin is equal to or slightly smaller than 1/3 of the nominal inner diameter of the metal guide pipe, the end faces of two ends of the roller pin are provided with a fillet structure, and the fillet of the head portion is greater than the fillet of the tail portion of the rolled portion.
4. The high-filling-rate pipe joint roll-connection forming tool is characterized in that the inner diameter expander comprises a main body, a thrust ball bearing, a stack spring and an adjusting nut are arranged in the main body to limit the mandrel sleeve in the main body, the tail end of the mandrel sleeve is locked through a set screw and a locking nut, the mandrel sleeve is arranged on the outer side of a mandrel, the mandrel can axially and relatively move in the mandrel sleeve, and the mandrel sleeve and the main body synchronously and axially move;
the spring gasket is arranged in a groove in the main body, close to one side of the working end of the mandrel, the spring gasket is axially positioned by a retainer ring for a hole, a spring is sleeved outside a mandrel sleeve part matched with the working end of the mandrel, one end of the spring is fixed in the spring gasket, the other end of the spring is embedded in a rubber ring, and when the spring naturally extends, the rubber ring is positioned outside the accommodating groove and blocks the roller pin.
5. The high-filling-rate-based pipe joint roll-connection forming tool is characterized in that the material of the working end of the core rod is different from the material of the base body of the non-working end, and hard alloy which is not easy to wear during batch production is adopted.
6. The pipe joint roll-pressing connection forming tool based on the high filling rate according to claim 1, wherein the mandrel sleeve is of a V-shaped welding type structure or an integral type structure, when the V-shaped welding type structure is adopted, the left end of the mandrel sleeve, which is bounded by a V-shaped welding position, is a connecting section and is made of alloy steel, and the right end of the mandrel sleeve is a working section, namely, a part matched with the working end of the mandrel is made of hard alloy or high-hardness die steel which ensures that the part is not easily abraded in batch production; the needle roller material is made of high-wear-resistance high-toughness powder high-speed steel.
7. The high-filling-rate-based pipe joint roll-connection forming tool is characterized in that the clamping die comprises a positioning sleeve and a half clamping die; the positioning sleeve is integrated and is used for fixing the pipe joint; the half-clamping die is split and used for fixing the catheter positioning sleeve and the catheter.
8. A rolling connection process is characterized in that the pipe joint and a metal conduit are rolled by the pipe joint rolling connection forming tool based on high filling rate according to any claim from 1 to 7, and the rolling connection process specifically comprises the following steps:
fixing a pipe joint to be connected with a metal conduit on a clamping die, wherein the pipe joint comprises a pipe sleeve or a light straight-through, the inner diameter expander is driven by a stepping shaft, the working end of a core rod is inserted into the metal conduit along with the core rod sleeve, a high-hardness and smooth roller pin is contacted with the inner wall of the metal conduit, the working end of the core rod rotates and advances to drive the roller pin distributed at equal intervals to be contacted with the inner wall of the conduit, so that the surface layer of the core rod is subjected to local plastic deformation to generate surface compressive stress, the wall material of the metal conduit is pressed into a groove of the pipe joint to achieve the maximum set torque of rolling, the outer wall of the metal conduit is subjected to contact stress with the pipe joint, and after the metal conduit is completely rolled in place.
9. The rolling connection process according to claim 8, wherein the shear thinning rate phi t of the metal conduit is controlled to be between 15% and 40% in the rolling process, and the shear thinning rate phi t is controlled to be betweentSatisfies the following conditions:
фt＝(tf-t0)/2t×100％；
wherein, tfThe inner diameter of the rolled conduit is mm; t is t0Rolling the inner diameter of the front guide pipe by mm; t is the nominal wall thickness of the catheter, mm.
10. The roll joining process according to claim 9, wherein the amount of the pressed material into the wall of the metal pipe is controlled to be greater than the amount of the filled material into the groove of the pipe joint during the rolling process, and specifically:
π*D*h*sinα(D+h*sinα/2＞π*a1*b1*(D+b1)+π*a2*b2*(D+b2)+π*a3*b3*(D+b3)
wherein, VGroove I＝π*a1*b1*(D+b1)；
VGroove II＝π*a2*b2*(D+b2)；
VGroove III＝π*a3*b3*(D+b3)；
a1, a2 and a3 are the groove widths of the three grooves respectively and are in mm;
b1, b2 and b3 are the groove depths of the three grooves respectively in mm;
d is the nominal outer diameter of the metal conduit in mm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113669520A (en) * | 2021-09-01 | 2021-11-19 | 西安卓锐航空科技有限公司 | Pipe joint for inducing cold flow by axial resultant force of asymmetric ring grooves and connecting method |
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| CN104815911A (en) * | 2015-04-01 | 2015-08-05 | 玉环县和成铜业有限公司 | Expansion tool |
| CN108971364A (en) * | 2018-08-28 | 2018-12-11 | 航珍航空技术（上海）有限公司 | Flareless inward turning single lead screw ex truding briquetting machine and its expander |
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| JPH09170610A (en) * | 1995-12-19 | 1997-06-30 | Hitachi Ltd | Method of joining zirconium alloy tube with stainless steel tube |
| CN201632543U (en) * | 2010-01-04 | 2010-11-17 | 浙江双飞无油轴承有限公司 | Split type shaping mandrel |
| CN203887082U (en) * | 2014-06-19 | 2014-10-22 | 洛阳隆华传热节能股份有限公司 | Tube plate positioning tube expander |
| CN104815911A (en) * | 2015-04-01 | 2015-08-05 | 玉环县和成铜业有限公司 | Expansion tool |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113669520A (en) * | 2021-09-01 | 2021-11-19 | 西安卓锐航空科技有限公司 | Pipe joint for inducing cold flow by axial resultant force of asymmetric ring grooves and connecting method |
| CN113669520B (en) * | 2021-09-01 | 2022-07-22 | 西安卓锐航空科技有限公司 | Pipe joint for inducing cold flow by axial resultant force of asymmetric ring grooves and connecting method |
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| CN111346980B (en) | 2021-01-05 |
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