CN213317039U - Shaping device for rounding pipe end of metal conduit - Google Patents

Abstract

The utility model discloses a shaping device for rounding the pipe end of a metal conduit, which comprises a base, a conical head pull rod, a multi-petal inner support die, a guide seat and a power source, wherein the conical head pull rod, the multi-petal inner support die, the guide seat and the power source are arranged on the base; meanwhile, the inner support body is sleeved on the conical head pull rod; the inner supporting body is in clearance fit with the guide seat, so that the multi-flap inner supporting die on the inner supporting body can move along the radial direction of the inner supporting die; the conical head pull rod is connected with a power source, and the power source pushes the conical head pull rod to move back and forth so as to drive the inner support body to expand or contract outwards. The shaping device has the advantages of simple structure, high stability, strong load capacity and good tube end shaping effect.

Description

Shaping device for rounding pipe end of metal conduit

Technical Field

The utility model relates to a shaping of the plastic forming pipe end of a metal conduit, more specifically, it relates to a shaping device for the pipe end of the metal conduit is round.

Background

Due to the functional requirements and the limitation of compact assembly space in the fields of aviation, aerospace, aviation, nuclear power and the like, the demand for a pipe with short straight-line sections at two ends of a bent pipe is increased. The straight line section of the pipe end is shortened, the requirement of assembly space is reduced, but the pipe end is too close to the elbow, and the plastic deformation of the elbow bending often causes the defects of deformation such as flattening, collapse and the like of the pipe end. When the pipe end is welded with a flange, a metal hose, a joint and the like, a large welding dislocation is formed, and even exceeds the allowable value of the I-grade welding dislocation height 0.1 delta (delta: the pipe wall thickness) in the technical requirement of conduit welding of QJ2865A, so that the stability and the reliability of the pipe joint are influenced. At present, the plastic forming of the metal conduit and the common shaping process of the pipe end are as follows: 1) extruding the pipe end by adopting a hydraulic extrusion mode of a forming die; 2) the end part of the pipe end is plugged into a conical core rod with the same diameter; 3) the flaring die and the necking die are adopted to perform flaring and then necking. 1) And 2) two shaping modes can play a certain shaping role, but the inside or outside of the pipe is not protected, so that the shaping effect is poor; the 3) shaping mode has complex working procedures and high input mould cost; the shaping mode has no universality for shaping pipe ends of different specifications, and higher die cost is required.

Chinese patent with publication number CN106825273B discloses a round expanding device, which specifically comprises a rebounding device, a round head, a push rod, a frame and a driving device, wherein the rebounding device is connected with the round head, the round head is sleeved on the push rod, the push rod is connected with the driving device, the round head, the push rod and the driving device are all connected on the frame, and the round expanding device solves the problems of relatively complex structure, large number of molds and relatively high cost of the conventional round expanding device, and has the advantages of light and small structure, simple structure and greatly reduced cost.

Chinese patent No. CN204953582U discloses a pipe fitting internal bracing type rounding machine, which specifically comprises a motor, a frame, an eccentric shaft and a rounding mechanism; the circle adjusting mechanism comprises a connecting rod, a conical rod and a supporting head, the connecting rod is connected with the eccentric shaft, the connecting rod is driven by the eccentric shaft to horizontally reciprocate when the eccentric shaft rotates, the conical rod is arranged at the end of the connecting rod, and the conical section of the conical rod is positioned in the supporting head; this pipe fitting internal stay formula rounding machine can accomplish the interior plastic school circle work of pipe fitting, and the during operation noise is low, and work efficiency is high, and this equipment structure is simple in addition, and the expense is low, has reduced the cost of enterprise.

However, the pipe end rounding mechanisms disclosed in the above two patents are both push-expanding internal support structures, which have the following disadvantages:

1) when in rounding, if the push rod does not extend out of the end part of the rounding head to form torque, the rounding head is tilted to form a cone angle, so that the pipe end forms a bell mouth, and an effective rounding effect cannot be obtained;

2) the push rod forms the effort of two directions during the forward motion, including radial effort and axial effort, radial effort promotes the radial expansion of full circle head, but its axial effort promotes full circle head forward motion, and during the school circle, full circle head receives the forward thrust of push rod, needs firm connection structure side to prevent full circle head and frame separation, uses for a long time, and the full circle head can become lax with being connected of frame promptly, and then influences the precision that the pipe was corrected.

SUMMERY OF THE UTILITY MODEL

The utility model provides a shaping device for metal pipe end is rectified circle, this shaping device simple structure, stability are high, load capacity is strong, the pipe end plastic is effectual.

In order to achieve the above purpose, the utility model provides a following technical scheme: the shaping device for rounding the pipe end of the metal conduit comprises a base, a conical head pull rod, a multi-petal inner support die, a guide seat and a power source, wherein the conical head pull rod, the multi-petal inner support die, the guide seat and the power source are arranged on the base; meanwhile, the inner support body is sleeved on the conical head pull rod; the inner supporting body is in clearance fit with the guide seat, so that the multi-flap inner supporting die on the inner supporting body can move along the radial direction of the inner supporting die; the conical head pull rod is connected with a power source, and the power source pushes the conical head pull rod to move back and forth so as to drive the inner support body to expand or contract outwards. Among the above-mentioned technical scheme, the embodiment that the interior support of conical head pull rod drive expands outward includes two kinds of situations: 1) the conical head pull rod moves forwards to drive the inner support body to expand outwards, so that a push-expansion type inner support structure is formed; or 2) the conical head pull rod moves backwards to drive the inner support body to expand outwards, so that a stretching-expanding type inner support structure is formed.

Preferably, the inner conical surfaces of the multi-petal inner supporting die are combined to form a conical stress cavity, the conical head pull rod is located in the stress cavity and is provided with an outer conical surface matched with the stress cavity, the power source pulls the conical head pull rod to move backwards, and the conical head pull rod moves to drive the inner supporting body to expand outwards. The cone head pull rod moves backwards to drive the inner support body to expand outwards to form a stretching-expanding type inner support structure, the end part of an inner support die of the stretching-expanding type inner support structure is stressed, the cone head pull rod can play an effective supporting role on the inner support die, and the formation of torque is avoided, so that the pipe end rounding of the conduit is facilitated.

Preferably, an annular inner cavity structure is formed inside the guide seat, and the annular convex ring is embedded into the annular inner cavity structure so as to axially limit the inner support body on the guide seat.

Preferably, the guide seat is further provided with an elastic element for promoting the inner support body to retract and reset.

Preferably, the elastic part is arranged in the annular inner cavity structure, one end of the elastic part is fixed on the guide seat, and the other end of the elastic part is abutted against the inner support body and gives the inner support body a tendency of inward contraction.

Preferably, the guide holder comprises a guide holder main body and a pressing cover installed on one side of the guide holder main body, the annular inner cavity structure is formed inside the guide holder main body, and the pressing cover is matched with the guide holder main body to axially limit the annular convex ring in the annular inner cavity structure.

Preferably, positioning key grooves are formed in the multi-petal inner supporting die; a limiting groove is formed in the position, corresponding to the positioning key groove, of the pressing cover; the positioning key is embedded in the positioning key groove, and meanwhile, the outer side end of the positioning key is embedded in the limiting groove.

Preferably, the front ends of the multi-petal inner supporting dies are respectively provided with orthopedic sleeves, and the multi-petal orthopedic sleeves are combined into a cylindrical shape and are detachably fixed at the end parts of the inner supporting bodies to be used as orthopedic ends.

Preferably, the catheter further comprises a tube end sheath, wherein the tube end sheath comprises at least two split sheath bodies; when in rounding, the two protective sleeves are separately formed into a cylinder shape and locked by a fastener, and simultaneously the outer contour of the end of the metal conduit to be rounded is coated, so that the end of the metal conduit is positioned between the conical head pull rod and the end protective sleeve.

Preferably, the orthopedic sleeve is made of brass or aluminum bronze; alternatively, the power source is a hydraulic cylinder.

To sum up, the utility model discloses following beneficial effect has:

1. compared with the existing push-expanding type inner supporting structure, the scheme adopts the pull-expanding type inner supporting structure, when in roundness correction, the end part of the inner supporting die is stressed, the conical head pull rod can play an effective supporting role on the inner supporting die, and the torque is prevented from being formed, so that the roundness correction of the pipe end of the conduit is facilitated;

2. the inner supporting die of the utility model runs through the guide seat and the end part of the roundness correction, when the roundness correction is carried out, the inner supporting die is pulled backwards by the pull rod, the guide seat effectively supports the inner supporting die, the axial acting force of the conical head pull rod is balanced, and the inner supporting die can be prevented from moving backwards;

3. the front ends of the multi-petal inner supporting dies of the utility model are respectively provided with the orthopedic sleeves, the multi-petal orthopedic sleeves are combined into a cylinder shape and are fixed on the end part of the inner supporting body in a detachable way to be used as orthopedic ends, and the orthopedic requirements of pipe ends with different specifications can be met by replacing the orthopedic sleeves with different outer diameters;

4. the shaping device also comprises a pipe end sheath which plays a role in protecting the outer contour of the pipe and is beneficial to improving the precision of the roundness correction.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a cross-sectional view of FIG. 1;

FIG. 3 is an exploded view of the structure of the present invention;

fig. 4 is a schematic structural view of the inner supporting mold of the present invention;

FIG. 5 is a schematic view of the working state of the present invention;

fig. 6 is a cross-sectional view of fig. 5.

Reference numerals: 1. an inner support assembly; 101. a conical head pull rod; 102. internally supporting the mold; 10201. a spring mounting hole; 10202. positioning the key slot; 103. an orthopedic sleeve; 104. a spring; 105. a positioning key; 106. a guide seat; 10601. an inner bore; 10602. tightening the screw; 107. a compression cover; 10701. a limiting groove; 10702. a bolt; 108. a force-bearing cavity; 109. a screw; 2. a tube end sheath; 201. the sheath is split; 202. a bolt; 3. a hydraulic cylinder; 301. a piston rod; 302. a nut; 4. a base; 401. a base plate; 402. a riser.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

The embodiment discloses a shaping device for rounding the pipe end of a metal conduit, which comprises a base 4, an inner support assembly 1 arranged on the base 4 and a power source, wherein the power source is a hydraulic cylinder 3, the hydraulic cylinder 3 adopts a piston hydraulic cylinder, and the cylinder diameter is matched with the front-back movement range of a conical head pull rod 101 of the inner support assembly 1, as shown in fig. 1, fig. 2 and fig. 3; the base 4 consists of a bottom plate 401 and a vertical plate 402 which are perpendicular to each other, and the internal support component 1 and the hydraulic cylinder 3 are transversely arranged on the base 4, wherein the internal support component 1 is fixed on the bottom plate 401, and the hydraulic cylinder 3 is transversely fixed on the vertical plate 402; the hydraulic cylinder 3 is transversely installed at the rear end side of the inner support assembly 1, a piston rod 301 of the hydraulic cylinder 3 is in threaded connection with the conical head pull rod 101, and a nut 302 is additionally arranged at the joint for fastening and preventing loosening.

As shown in fig. 3 and 4, the inner support assembly 1 includes a conical head pull rod 101, a multi-petal inner support die 102, and a guide seat; the multi-petal inner supporting die 102 forms an inner supporting body with a cylindrical outline, the inner supporting body penetrates through the guide seat, the front part of the inner supporting body extends out of the guide seat, the rear part of the inner supporting body extends to form an annular convex ring and is axially limited by the guide seat through the annular convex ring, the structure of the annular convex ring is that arc-shaped convex blocks are respectively formed on the multi-petal inner supporting die, and the arc-shaped convex blocks on the multi-petal inner supporting die form an annular convex ring with an annular outline; meanwhile, the inner support body is sleeved on the conical head pull rod 101, specifically, a conical stress cavity is formed by combining the inner conical surfaces of the multi-petal inner support die 102, the conical head pull rod 101 is positioned in the stress cavity, and the conical head pull rod 101 is provided with an outer conical surface matched with the stress cavity; in the radial direction, the inner supporting body is in clearance fit with the guide seat 106, so that the multi-petal inner supporting die 102 on the inner supporting body can move along the radial direction of the inner supporting die 102; the conical head pull rod 101 moves back and forth to drive the inner support body to expand or contract outwards, and meanwhile, the fit clearance between the cylindrical outer profile of the multi-petal inner support die 102 and the guide seat 106 is equal to the expandable range of the inner support die 102. The cross section of the stress cavity is gradually reduced or increased from the front to the back, and when the cross section of the stress cavity is gradually increased from the front to the back, the conical head pull rod 101 moves forwards to drive the inner support body to expand outwards; preferably, the cross section of the stress cavity is gradually reduced from the front to the back, the cross section of the conical pull rod 101 is also gradually reduced from the front to the back, and the conical pull rod 101 moves backwards to drive the inner support body to expand outwards, so that a stretching type inner support structure is formed. The rear end of the conical head pull rod is connected with the hydraulic cylinder, the hydraulic cylinder 3 pulls the conical head pull rod 101 to move backwards, the conical head pull rod 101 moves backwards relative to the inner supporting die 102 and enables the inner supporting die 102 to expand outwards, the inner supporting die 102 expands outwards and extrudes the end part of the pipe end, and therefore the end part of the pipe end is subjected to rounding and shaping. During unloading, the hydraulic cylinder 3 pushes the conical head pull rod 101 to move forwards, the inner supporting die 102 retracts inwards towards the center direction, and the guide pipe can be drawn out from the end part of the inner supporting die 102. Compared with the existing push-expanding type inner supporting structure, when the pipe end is rounded, the end part of the inner supporting die 102 of the pull-expanding type inner supporting structure is stressed, the conical head pull rod 101 can effectively support the inner supporting die 102, and torque is prevented from being formed, so that the pipe end is rounded. And simultaneously, the utility model discloses interior mould 102 that props runs through guide holder 106 and the tip of rounding, during the rounding, interior mould 102 that props receives the pulling force behind conical head pull rod 101, and guide holder 106 plays effective supporting role to interior mould 102 that props, has balanced conical head pull rod 101's axial effort, can prevent interior mould 102 that props and move backward. Meanwhile, the shaping device is simple in structure, high in stability, strong in load capacity and good in pipe end shaping effect.

The guide seat comprises a guide seat main body and a pressing cover arranged on one side of the guide seat main body, an annular inner cavity structure is formed inside the guide seat main body, an annular convex ring is embedded into the annular inner cavity structure, the pressing cover (107) is matched with the guide seat main body (106) to axially limit the annular convex ring in the annular inner cavity structure, and then the inner support body is circumferentially limited on the guide seat; thus, the assembly of the inner support body and the guide seat 106 is facilitated. Similarly, in the radial direction, the inner support body is in clearance fit with the guide seat 106, and the annular convex ring is also in clearance fit with the annular inner cavity structure; thereby enabling the multi-petal inner supporting die 102 on the inner supporting body to move along the radial direction of the inner supporting die 102.

The outer contour of the multi-petal inner support die 102 forms a cylinder shape and is arranged in the guide seat 106, and the periphery of the multi-petal inner support die is limited and supported by the elastic piece and the positioning key 105; specifically, the multi-petal inner supporting die 102 is provided with positioning key slots 10202; limiting grooves 10701 are formed in the position, corresponding to the positioning key slot 10202, of the pressing cover 107, and the limiting grooves 10701 are arranged at equal intervals along the inner wall of the pressing cover 107; the positioning key keyway 10202 is embedded with a positioning key 105, and meanwhile, the outer end of the positioning key 105 is embedded into the limit groove 10701 so as to limit the inner support body on the guide seat 106 in the circumferential direction, thereby avoiding circumferential rotation of the inner support body.

Meanwhile, the guide seat is also provided with an elastic piece for promoting the inner support body to retract and reset, and the specific structure of the elastic piece can be referred to as an authorization notice number CN 106825273B; or the elastic piece is arranged in the annular inner cavity structure, one end of the elastic piece is fixed on the guide seat, and the other end of the elastic piece is abutted against the inner support body and gives the inner support body a tendency of inward contraction; wherein, the elastic element is a spring 104; the outer contour of each flap of inner supporting die 102 is provided with a spring mounting hole 10201, the guide seat 106 is provided with an inner hole 10601 corresponding to the spring mounting hole 10201, one end of the spring 104 is embedded into the spring mounting hole 10201 and is abutted against the inner supporting die 102, the other end of the spring 104 is embedded into the inner hole 10601 and is limited in the inner hole 10601 through a set screw 10602, the spring 104 is arranged to support and reset the inner supporting die 102, and the elastic piece is simple in structure and does not need to be supported by an elastic piece support structure.

Preferably, the front ends of the multi-flap inner supporting dies 102 are respectively provided with orthopedic sleeves 103, the multi-flap orthopedic sleeves 103 are combined into a cylindrical shape and detachably fixed at the end parts of the inner supporting bodies to serve as orthopedic ends, the orthopedic sleeves 103 adopted in the scheme are fixed at the orthopedic ends of the inner supporting dies 102 by screws 109, and therefore the requirements of pipe end orthopedic of different specifications are met by replacing the orthopedic sleeves 103 with different outer diameters. The outer diameter of the orthopedic sleeve 103 is smaller than the inner diameter of the end of the orthopedic pipe, and the difference value of the outer diameter and the inner diameter is smaller than the expandable range of the orthopedic device; and the orthopedic sleeve 103 is made of brass or aluminum bronze, so that obvious indentation on the inner surface of the pipe can be prevented.

Further, the shaping device also comprises a pipe end jacket 2, wherein the pipe end jacket 2 comprises at least two jacket split bodies 201, and the jacket split bodies 201 are semicircular; during rounding, the two sheath split bodies 201 form a cylindrical shape and cover the outer contour of the end of the metal conduit to be rounded, so that the end of the metal conduit is positioned between the conical head pull rod 101 and the end sheath 2, meanwhile, two sides of the end sheath 2 are locked by bolts 202, the inner diameter of the end sheath is larger than the required outer diameter of the end of the metal conduit to be rounded, the difference value of the two is the resilience value of the metal conduit to be rounded, and the outer contour of the conduit is protected. The hydraulic cylinder 3 pulls the conical head pull rod 101 to move backwards, the conical head pull rod 101 moves backwards relative to the inner support die 102 to enable the inner support die 102 to drive the orthopedic sleeve 103 to expand outwards, and the orthopedic sleeve 103 and the pipe end sheath 2 jointly act to extrude the end part of the pipe end, so that the end part of the pipe end is subjected to rounding and shaping. When the pipe is unloaded, the hydraulic cylinder 3 pushes the conical head pull rod 101 to move forwards, the inner supporting die 102 contracts towards the center under the action of the spring 104 and drives the orthopedic sleeve 103 to contract, and the outer contour diameter of the orthopedic sleeve 103 is smaller than the inner diameter of the pipe end, so that the guide pipe can be conveniently drawn out.

The mutual contact surfaces of the conical head pull rod 101, the inner supporting die 102, the guide seat 106 and the pressing cover 107 are smooth surfaces, so that the abrasion of the conical surfaces is reduced, the output resistance of the force of the hydraulic cylinder 3 is reduced, and the structural stability is improved.

The number of the inner supporting die 102, the return spring 104, the positioning key 105 and the limiting groove 10701 of the pressing cover 107 of the inner supporting assembly 1 is the same, and the number of the inner supporting die, the return spring 104, the positioning key 105 and the pressing cover is 4 in this embodiment.

As shown in fig. 5 and 6, the orthopedic sleeve 103 and the pipe end sheath 2 are designed according to the specification of the pipe 5 to be round, and the orthopedic sleeve 103 is fixed to the orthopedic end of the internal bracing die 102 by using a screw 109. When in roundness correction, the orthopedic sleeve 103 is arranged at the pipe end of the pipe to be corrected 5, and the 2-piece sheath split bodies 201 are combined into a cylinder shape and cover the outer contour of the pipe end. The hydraulic cylinder 4 pulls the conical head pull rod 101 to move backwards, the conical head pull rod 101 moves backwards relative to the inner supporting die 102 to enable the inner supporting die 102 to drive the orthopedic sleeve 103 to expand outwards to extrude the end part of the pipe end under the combined action of the conical head pull rod 101 and the pipe end sheath 2, and meanwhile, the conical head pull rod 101 plays an effective supporting role on the orthopedic end, so that the end part of the pipe end is subjected to circle-rectifying and shaping treatment. When the pipe is unloaded, the hydraulic cylinder 3 pushes the conical head pull rod 101 to move forwards, the inner supporting die 102 contracts towards the center under the action of the spring 104 and drives the orthopedic sleeve 103 to contract, and the outer contour diameter of the orthopedic sleeve 103 is smaller than the inner diameter of the pipe end, so that the guide pipe can be conveniently drawn out.

The utility model provides a to a shaping device of metal conduit pipe end rounding. The outer diameter of the orthopedic end of the shaping device is adjustable, so that the pipe end can be conveniently subjected to feeding and discharging during shaping, the feeding and discharging time is saved, and the working efficiency is improved. Aiming at the pipe end shaping of the catheters with different specifications, only the orthopedic sleeve 103 and the pipe end sheath 2 need to be replaced, thereby saving the investment of the die cost and reducing the manufacturing cost.

The directions given in the present embodiment are merely for convenience of describing positional relationships between the respective members and the relationship of fitting with each other. It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (10)

1. The shaping device for rounding the pipe end of the metal conduit comprises a base (4), and a conical head pull rod (101), a multi-segment inner supporting die (102), a guide seat and a power source which are arranged on the base (4), and is characterized in that the multi-segment inner supporting die (102) forms an inner supporting body with a cylindrical outer profile, the inner supporting body penetrates through the guide seat (106), the front part of the inner supporting body extends out of the guide seat, and the rear part of the inner supporting body extends to form an annular convex ring and is axially limited by the guide seat (106) through the annular convex ring; meanwhile, the inner support body is sleeved on the conical head pull rod (101); the inner supporting body is in clearance fit with the guide seat (106), so that the multi-flap inner supporting die (102) on the inner supporting body can move along the radial direction of the inner supporting die (102); the conical head pull rod (101) is connected with a power source, and the power source pushes the conical head pull rod (101) to move back and forth so as to drive the inner support body to expand outwards or contract inwards.

2. The reshaping device for pipe end rounding of a metal conduit according to claim 1, wherein the inner conical surface of the multi-petal inner bracing die (102) is combined to form a conical stress cavity (108), the conical pull rod (101) is positioned in the stress cavity (108), the conical pull rod (101) has an outer conical surface matched with the stress cavity (108), and the power source pulls the conical pull rod (101) to move backwards, and the conical pull rod (101) moves to drive the inner bracing body to expand outwards.

3. The shaping device for pipe end rounding of metal guide pipes according to claim 1 or 2, characterized in that the inside of the guide seat (106) forms an annular inner cavity structure, and the annular convex ring is embedded into the annular inner cavity structure to axially limit the inner support body on the guide seat (106).

4. The shaping device for pipe end rounding of metal conduit according to claim 3, wherein an elastic member for urging the inner frame to retract and return is further installed on the guide holder (106).

5. The truing device for pipe end rounding of metal conduit according to claim 4, characterized in that said elastic member is arranged in said annular inner cavity structure, and one end of the elastic member is fixed on the guide seat (106), and the other end of the elastic member is abutted against said inner support body and gives the inner support body a tendency to retract.

6. The shaping device for pipe end rounding of metal conduit according to claim 1, wherein the guide holder (106) comprises a guide holder body and a pressing cover (107) mounted on one side of the guide holder body, the inner part of the guide holder body forms the annular inner cavity structure, and the pressing cover (107) is matched with the guide holder body to axially limit the annular convex ring in the annular inner cavity structure.

7. The shaping device for rounding the pipe end of a metal conduit according to claim 6, wherein the multi-petal inner support die (102) is provided with positioning key slots (10202); a limiting groove (10701) is formed in the position, corresponding to the positioning key groove (10202), of the pressing cover (107); the embedded positioning key (105) that has of positioning key keyway (10202), simultaneously, the outside end embedding of positioning key (105) is in spacing groove (10701).

8. The orthopedic device for pipe end rounding of metal catheters according to claim 1, characterized in that the front ends of the multi-petal inner supporting dies (102) are respectively provided with orthopedic sleeves (103), and the multi-petal orthopedic sleeves (103) are combined into a cylinder shape and are detachably fixed at the end of the inner supporting body to be used as orthopedic ends.

9. The shaping device for pipe end rounding of metal catheters according to claim 1, further comprising a pipe end sheath (2), the pipe end sheath (2) comprising at least two sheath segments (201); when in rounding, the two sheath split bodies (201) form a cylinder shape and are locked by a fastener, and simultaneously coat the outer contour of the end of the metal conduit to be rounded, so that the end of the metal conduit is positioned between the conical head pull rod (101) and the end sheath (2).

10. The orthopedic device for pipe end rounding of metal catheters according to claim 8, characterized in that the orthopedic sleeve (103) is made of brass or aluminum bronze; or the power source is a hydraulic cylinder (3).

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