CN111408644A - Forming die and forming process for pipe hole flanging - Google Patents
Forming die and forming process for pipe hole flanging Download PDFInfo
- Publication number
- CN111408644A CN111408644A CN201910013047.4A CN201910013047A CN111408644A CN 111408644 A CN111408644 A CN 111408644A CN 201910013047 A CN201910013047 A CN 201910013047A CN 111408644 A CN111408644 A CN 111408644A
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- China
- Prior art keywords
- push rod
- processed
- bottom hole
- die
- pipe
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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
- B21D19/00—Flanging or other edge treatment, e.g. of tubes
- B21D19/08—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws
- B21D19/088—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws for flanging holes
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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
- B21D19/00—Flanging or other edge treatment, e.g. of tubes
- B21D19/08—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws
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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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
Abstract
The invention relates to the technical field of pipe hole flanging, and particularly provides a forming die and a forming process of pipe hole flanging. The forming die for the pipe hole flanging comprises a plurality of internal dies and a push rod assembly, at least one part of the internal dies can freely enter the pipe fitting to be processed, the push rod assembly can freely enter the pipe fitting to be processed, and a preset bottom hole is formed in the pipe wall of the pipe fitting to be processed. Under the condition that the push rod assembly and the selected inner die both enter the pipe fitting to be processed, the push rod assembly pushes the selected inner die to enable the selected inner die to move towards the direction of the preset bottom hole at the position corresponding to the preset bottom hole, and the selected inner die extrudes the preset bottom hole to form a flanging. Through such mould, can form the turn-ups of co-altitude not, solve with the help of pulling out the hole collude adopt pull out the hole technology to carry out the turn-ups to specific bottom outlet and can only form a high turn-ups, have the problem of certain limitation. And the forming die is not limited by the size of a bottom hole preset on the pipe fitting to be processed, so that the application range is expanded.
Description
Technical Field
The invention relates to the technical field of pipe hole flanging, and particularly provides a forming die and a forming process of pipe hole flanging.
Background
In the air conditioner, gas in an evaporator is collected to a gas collecting pipe through a plurality of branch pipes and is conveyed to a condenser of an outdoor unit through the gas collecting pipe to exchange heat with outdoor air. The gas collecting pipe and the branch pipes are fixed together in a welding mode. Particularly, the pipe wall of the gas collecting pipe is provided with a plurality of openings, each opening is provided with a flanging, the branch pipe is inserted into the opening, and the flanging and the branch pipe are welded at the flanging to realize the connection of the branch pipe and the gas collecting pipe.
Generally, the flanging forming of the pipe wall opening adopts a hole pulling process, specifically: and processing a bottom hole on the pipe wall, extending the hole-pulling hook into the bottom hole, and simultaneously pulling out the hole-pulling hook to form a flanging by rotating the hole-pulling hook around the central shaft of the bottom hole at a high speed. However, under the condition that the upper bottom hole of the pipe wall is processed, the flanging with only one height can be formed by using the hole pulling hook, and certain limitation is realized.
Accordingly, there is a need in the art for a new solution to the above problems.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, to solve the problem that flanging a specific bottom hole by using a hole-pulling process with the help of a hole-pulling hook can only form a high-degree flanging, the invention provides a forming die for flanging a pipe hole, on one hand, the forming die comprises a plurality of inner dies, at least one part of the inner dies can freely enter a pipe to be processed, and a preset bottom hole is arranged on the pipe wall of the pipe to be processed; the push rod assembly can freely enter the pipe fitting to be processed; and under the condition that the push rod assembly and the selected inner die both enter the pipe fitting to be processed, the push rod assembly can push the selected inner die to move towards the direction of the preset bottom hole at the position corresponding to the preset bottom hole so as to extrude the preset bottom hole to form the flanging.
In a preferred technical solution of the above forming mold, the push rod assembly includes a first push rod and a second push rod both capable of freely entering the pipe to be processed, and under a condition that the push rod assembly and the selected inner mold both enter the pipe to be processed, the selected inner mold is located between the first push rod and the second push rod, so that the first push rod and the second push rod push the selected inner mold in a manner of moving in opposite directions.
In a preferred embodiment of the above forming mold, the first push rod and/or the second push rod form a guiding structure at the end portions close to each other, so that the selected inner mold can move towards the preset bottom hole by means of the guiding structure during the process of moving the first push rod and the second push rod towards each other.
In a preferred technical solution of the above forming mold, the guiding structure is an expanding structure that is inclined outward from a direction away from the preset bottom hole toward a direction close to the preset bottom hole.
In the preferable technical scheme of the forming mold, an avoiding structure is formed on the expanding structure, and in the process that the first push rod and the second push rod push the selected inner mold to move towards the direction of the preset bottom hole in a mode of moving in opposite directions, the moving distance of the selected inner mold towards the direction of the preset bottom hole is increased through the matching of the end parts, close to each other, of the first push rod and/or the second push rod and the avoiding structure.
In a preferred technical solution of the above forming mold, the inner mold is a spherical structure.
In a preferred technical scheme of the forming die, the forming die comprises an outer die, and the outer die is used for being fixed at a position corresponding to the preset bottom hole outside the pipe fitting to be processed so as to form the flanging by matching the outer die with the selected inner die.
The pipe hole flanging forming die comprises a plurality of inner dies and a push rod assembly, wherein at least one part of the inner dies can freely enter a pipe to be processed, the push rod assembly can freely enter the pipe to be processed, and a preset bottom hole is formed in the pipe wall of the pipe to be processed. Under the condition that the push rod assembly and the selected inner die both enter the pipe fitting to be processed, the push rod assembly pushes the selected inner die to enable the selected inner die to move towards the direction of the preset bottom hole at the position corresponding to the preset bottom hole, and the selected inner die extrudes the preset bottom hole to form a flanging.
At least one part of the internal molds can freely enter the pipe fitting to be processed, and the selected internal molds move towards the direction of the preset bottom hole at the position corresponding to the preset bottom hole by means of the push rod through selecting different internal molds, so that flanges with different heights can be formed. And the inner die can freely enter the pipe fitting to be processed, and the forming die is not limited by the size of a preset bottom hole on the pipe wall of the pipe fitting to be processed, so that the application range is expanded.
In a preferred technical scheme of the invention, the push rod assembly comprises a first push rod and a second push rod which can freely enter the pipe fitting to be processed, and the selected inner die is positioned between the first push rod and the second push rod under the condition that the push rod assembly and the selected inner die both enter the pipe fitting to be processed. Therefore, the push rod can conveniently push the selected internal mold to enable the selected internal mold to move towards the direction of the preset bottom hole at the position corresponding to the preset bottom hole, operation is convenient, the mold is simple in structure, and manufacturing cost is low. Preferably, the forming die comprises an outer die, and the outer die is used for being fixed at a position corresponding to the preset bottom hole outside the pipe fitting to be processed so as to be matched with the selected inner die to extrude the preset bottom hole to form a flanging. The forming quality of the flanging is ensured by the arrangement of the outer die.
On the other hand, the invention provides a forming process of a pipe hole flanging, which comprises the following steps: providing a plurality of inner dies, wherein at least one part of the inner dies can freely enter the pipe fitting to be processed, and a preset bottom hole is formed in the pipe wall of the pipe fitting to be processed; providing a push rod assembly which can freely enter the pipe to be processed; selecting an inner mold according to the target height of a flanging formed on a preset bottom hole and the size of the preset bottom hole; moving the selected inner die into a position corresponding to the preset bottom hole in the pipe fitting to be processed; and the push rod assembly enters the pipe fitting to be processed and pushes the selected inner die to move towards the direction of the preset bottom hole by a distance corresponding to the target height.
In a preferred technical solution of the above molding process, the push rod assembly includes a first push rod and a second push rod both capable of freely entering the pipe to be processed, and the step of the push rod assembly entering the pipe to be processed and pushing the selected inner mold to move toward the preset bottom hole by a distance corresponding to the target height specifically includes: respectively enabling the first push rod and the second push rod to enter the pipe fitting from two ends of the pipe fitting to be machined, and enabling the selected inner die to be located between the first push rod and the second push rod; and enabling the first push rod and the second push rod to push the selected inner die to move towards the direction of the preset bottom hole by a distance corresponding to the target height in a mode of opposite movement.
In a preferred technical solution of the above molding process, the molding process further includes the steps of: providing an outer mold; the outer die is used for being fixed at a position, corresponding to the preset bottom hole, outside the pipe fitting to be machined, so that the flanging is formed through the matching of the outer die and the selected inner die.
It should be noted that the forming process of the pipe hole flanging has all the technical effects of the forming die of the pipe hole flanging, and details are not repeated herein.
Drawings
Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:
fig. 1 is an exploded view of a forming die and a pipe to be processed according to a first embodiment of the present invention;
fig. 2 is a top view of the forming die and the pipe to be processed according to the first embodiment of the present invention after being assembled;
FIG. 3 is a cross-sectional view taken along plane A-A of FIG. 2;
fig. 4 is a plan view of the forming die of the first embodiment of the present invention in a state of forming a flange on the pipe wall of the pipe to be processed;
FIG. 5 is a cross-sectional view taken along plane B-B of FIG. 4;
fig. 6 is a schematic structural view of an inner mold in the forming mold of the present invention;
fig. 7 is another schematic structural view of the inner mold in the molding die of the present invention;
fig. 8 is an exploded view of a forming die and a pipe member to be processed according to a second embodiment of the present invention;
fig. 9 is a top view of the forming die and the pipe to be processed according to the second embodiment of the present invention after being assembled;
FIG. 10 is a cross-sectional view taken along plane C-C of FIG. 9;
fig. 11 is a plan view of a forming die according to a second embodiment of the present invention in a state where a flange is formed on a pipe wall of a pipe to be processed;
FIG. 12 is a cross-sectional view taken along plane D-D of FIG. 11;
fig. 13 is an exploded view of a forming die and a pipe member to be processed according to a third embodiment of the present invention;
fig. 14 is a top view of the forming die of the third embodiment of the present invention assembled with a pipe to be processed;
FIG. 15 is a cross-sectional view taken along plane E-E of FIG. 14;
fig. 16 is a plan view of a forming die according to a third embodiment of the present invention in a state where a flange is formed on a pipe wall of a pipe to be processed;
FIG. 17 is a cross-sectional view taken along plane F-F of FIG. 16;
fig. 18 is a diagram of the main steps of the tube bore flanging forming process according to an embodiment of the invention.
List of reference numerals:
1. an inner mold; 2. a push rod assembly; 21. a first push rod; 22. a second push rod; 23. a guide structure; 24. an avoidance structure; 25. a cavity; 3. a pipe fitting to be processed; 31. presetting a bottom hole; 32. flanging; 41. a first outer mold; 411. a first semicircular groove; 412. a first bolt hole; 413. opening a hole; 42. a second outer mold; 421. a second semi-circular groove; 422. a second bolt hole.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. For example, although the pipe to be machined in the following embodiments is made of copper, a person skilled in the art may adjust the pipe to be machined as needed to adapt to a specific application, and the material of the pipe to be machined, for example, the pipe to be machined flanged by the forming die of the present invention may be a stainless steel material, an aluminum material, or other materials with good ductility. Obviously, the technical solution after adjustment still falls into the protection scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; either directly or indirectly through intervening media, or through the communication between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1 to 7, fig. 1 is an exploded view of a forming die and a pipe member to be processed according to a first embodiment of the present invention; fig. 2 is a top view of the forming die and the pipe to be processed according to the first embodiment of the present invention after being assembled; FIG. 3 is a cross-sectional view taken along plane A-A of FIG. 2; fig. 4 is a plan view of the forming die of the first embodiment of the present invention in a state of forming a flange on the pipe wall of the pipe to be processed; FIG. 5 is a cross-sectional view taken along plane B-B of FIG. 4; fig. 6 is a schematic structural view of an inner mold in the forming mold of the present invention; fig. 7 is another schematic structural view of the inner mold in the molding die of the present invention.
In a first embodiment of the present invention, as shown in fig. 1 to 5, a pipe wall of a pipe 3 to be processed made of copper has a preset bottom hole 31, and a forming die for flanging the pipe hole includes four inner dies 1 and a push rod assembly 2. Specifically, the inner molds 1 are four spheres with different diameters, and the four inner molds 1 can freely enter the pipe fitting 3 to be processed from the pipe end of the pipe fitting 3 to be processed; the push rod assembly 2 includes a first push rod 21 and a second push rod 22, and a right end of the first push rod 21 and a left end of the second push rod 22 each have a guide structure 23, such as a slope structure (shown in fig. 3) inclined outward from a direction away from the preset bottom hole 31 toward the preset bottom hole 31.
As shown in fig. 2 and 3 and according to the orientation shown in fig. 3, in the use process of the pipe hole flanging forming die, one inner die 1 is selected to be placed from the end of the pipe 3 to be processed to the position corresponding to the preset bottom hole 31 in the pipe 3 to be processed, namely, the position right below the preset bottom hole 31, the first push rod 21 penetrates through the left end of the pipe 3 to be processed, and the second push rod 22 penetrates through the right end of the pipe 3 to be processed. Under the action of external force, the first push rod 21 and the second push rod 22 move in opposite directions and reach the state shown in fig. 3, the inclined surface of the guide structure 23 contacts the selected inner mold 1, the first push rod 21 and the second push rod 22 continue to move in opposite directions, the inclined surface of the guide structure 23 extrudes the selected inner mold 1, the selected inner mold 1 moves upwards under the action of component force in the vertical direction, the upper portion of the selected inner mold 1 extrudes the preset bottom hole 31, and finally the state shown in fig. 5 is reached to form the flanging 32. Under the condition that the size of the preset bottom hole 31 is kept unchanged, spheres (different inner molds 1) with different diameters move towards the direction of the preset bottom hole 31 from the position, corresponding to the preset bottom hole 31, in the pipe fitting 3 to be processed by means of the push rod assembly 2, and the preset bottom hole 31 is extruded to form flanges 32 with different heights. The first push rod 21 and the second push rod 22 may be manually pushed to move toward each other, the first push rod 21 and the second push rod 22 may be manually pushed to move toward each other by a force increasing mechanism, or a driving device such as a hydraulic pump or a motor may be used to drive the first push rod 21 and the second push rod 22 to move toward each other. In addition, the height of the flanging 32 is the distance between the highest point of the flanging 32 and the highest point of the outer surface of the pipe wall of the pipe 3 to be processed.
The plurality of internal molds 1 can freely enter the pipe fittings 3 to be processed, and the push rod assembly 2 pushes the selected internal molds 1 to move towards the direction of the preset bottom hole 31 at the position corresponding to the preset bottom hole 31 so as to extrude the preset bottom hole 31 to form the flanging 32. By adopting the forming die to carry out flanging forming, the size limitation of the preset bottom hole 31 on the pipe wall of the pipe fitting 3 to be processed can be avoided, and the application range is enlarged. The first push rod 21 and the second push rod 22 penetrate into the pipe fitting 3 to be processed from two ends of the pipe fitting 3 to be processed respectively, the selected inner die 1 is conveniently pushed to move towards the direction of the preset bottom hole 31 at the position corresponding to the preset bottom hole 31, and the die is simple in structure and low in manufacturing cost. Centre form 1 is the spheroid, convenient manufacturing to in waiting to process the position orientation that corresponds with predetermineeing bottom outlet 31 in the pipe fitting 3 and predetermineeing the in-process that the bottom outlet 31 direction removed, centering precision is high. The guide structures 23 at the two ends of the first push rod 21 and the second push rod 22 are arranged to be inclined plane structures, so that the manufacture is convenient, and the manufacture difficulty of the die is reduced.
It will be understood by those skilled in the art that the inner mold 1 is a sphere merely as an exemplary illustration, and those skilled in the art can adjust it as required to suit the specific application, for example, the inner mold 1 may be the structure shown in fig. 6, the inner mold 1 is a cylinder, the lower side of the cylinder is symmetrically formed with two inclined planes, and in use, the guiding structures 23 at the ends of the first push rod 21 and the second push rod 22 push the two inclined planes at the lower part of the cylinder to move the inner mold 1 toward the preset bottom hole 31; the inner mold 1 may also be of the structure shown in fig. 7, the upper portion of the inner mold 1 is a hemisphere structure, the lower portion of the inner mold 1 is a cylinder, and the lower portion of the cylinder is symmetrically formed with two inclined planes, and in the using process, the guiding structures 23 at the ends of the first push rod 21 and the second push rod 22 extrude the two inclined planes at the lower portion of the cylinder under the pushing of an external force, so that the inner mold 1 moves towards the direction of the preset bottom hole 31. In addition, the material of the pipe 3 to be processed is not limited to copper material, and the material of the pipe 3 to be processed may be stainless steel material, aluminum material, or other material with good ductility.
It will be understood by those skilled in the art that the ramp structure is also described as the guide structure 23, and those skilled in the art can adjust the ramp structure as needed to suit the specific application, for example, the guide structure 23 may be an inclined groove, or one of the ends of the first push rod 21 and the second push rod 22 near each other may be formed with the guide structure 23, which is a ramp structure, and the end of the other of the first push rod 21 or the second push rod 22 is a vertical surface. Under the state that the end parts of the first push rod 21 and the second push rod 22 are contacted with the selected inner mold 1, the push rods with the end parts having the inclined surface structure are pushed, so that the selected inner mold 1 moves towards the direction of the preset bottom hole 31.
Referring to fig. 8 to 12, fig. 8 is an exploded view of a forming die and a pipe member to be processed according to a second embodiment of the present invention; fig. 9 is a top view of the forming die and the pipe to be processed according to the second embodiment of the present invention after being assembled; FIG. 10 is a cross-sectional view taken along plane C-C of FIG. 9; fig. 11 is a plan view of a forming die according to a second embodiment of the present invention in a state where a flange is formed on a pipe wall of a pipe to be processed; fig. 12 is a cross-sectional view taken along plane D-D of fig. 11.
In the second embodiment of the present invention, as shown in fig. 8 to 12, the avoidance structure 24 is formed on the slope structure (the guide structure 23) of the end portion where the first push rod 21 and the second push rod 22 are close to each other. Specifically, the avoiding structure 24 is two grooves arranged in parallel in the vertical direction on the inclined surface structure at the end of the first push rod structure 21 and three grooves arranged in parallel in the vertical direction on the inclined surface structure at the end of the second push rod structure 21. In the process that the first push rod 21 and the second push rod 22 push the selected inner mold 1 to move towards the direction of the preset bottom hole 31, the end parts of the first push rod 21 and the second push rod 22, which are close to each other, enter the grooves (avoiding structures 24) at the end parts of the other end parts (as shown in fig. 12), so that the situation that the avoiding structures 24 are not provided is avoided, the lower parts of the end parts of the first push rod 21 and the second push rod 22, which are close to each other, abut against each other, and the first push rod 21 and the second push rod 22 are limited to move continuously towards each other, the moving distance of the selected inner mold 1 towards the direction of the preset bottom hole 31 is increased, the selected inner mold 1 can move above the first push rod 21 and the second push rod 22, and a flanging 32 with a higher height can be formed under the condition that the difference between the inner diameter of the preset bottom hole 31 and the diameter of the.
It will be understood by those skilled in the art that the grooves on the ramp structures at the ends of the first and second pushrods 21, 22 near each other may be reversed; in addition, the number of the grooves on the first push rod 21 is two, and the number of the grooves on the second push rod 22 is three, which is only an exemplary description, and those skilled in the art can adjust the number as needed to suit the specific application, for example, the number of the grooves on the first push rod 21 can be one, three, four, etc., and correspondingly, the number of the grooves on the second push rod 22 is two, four, five, etc.
With continued reference to fig. 8-12, preferably, the molding die includes an outer die including a first outer die 41 and a second outer die 42. The first outer die 41 and the second outer die 42 are respectively provided with a first semicircular groove 411 and a second semicircular groove 421 which are matched with the outer surface shape of the pipe fitting 3 to be processed, the first outer die 41 and the second outer die 42 are respectively provided with four first bolt holes 412 and four second bolt holes 422 at positions corresponding to four corners of the first outer die 41, and the middle part of the first outer die 41 is also provided with an opening 413. As shown in fig. 9 to 12, in the use state, the first outer die 41 and the second outer die 42 clamp the pipe 3 to be processed in the middle through the first semicircular groove 411 and the second semicircular groove 421, and the opening 413 and the preset bottom hole 31 are made to be in a coaxial position, and then the first outer die 41, the second outer die 42 and the pipe 3 to be processed are fixed together by bolts (not shown) penetrating the first bolt holes 412 and the second bolt holes 422. It should be noted that, the forming mold includes a plurality of sets of first outer mold 41 and second outer mold 42, and the size of the opening 413 on different first outer molds 41 is different so as to match with the use of a plurality of inner molds 1.
In the process that the first push rod 21 and the second push rod 22 push the selected inner mold 1 and move the selected inner mold 1 towards the direction of the preset bottom hole 31, the selected inner mold 1 presses the preset bottom hole 31, so that the material at the edge of the preset bottom hole 31 moves upwards and deforms, and is finally pressed on the inner wall of the opening 413. The forming quality of the flanging 32 is ensured by the arrangement of the outer die. The outer dies are provided as a first outer die 41 and a second outer die 42 which can be separated, so that the outer dies are convenient to assemble with the pipe fitting 3 to be processed.
It will be appreciated by those skilled in the art that the outer die comprising the first outer die 41 and the second outer die 42 is only an alternative embodiment and that the skilled person will be able to adapt it as required to the specific application, for example the outer die may be a block structure formed with a through hole matching the outer diameter of the pipe to be machined and an opening extending perpendicular to the through hole from one side to the through hole, the block structure being provided with a threaded hole extending from the surface to the through hole on the side opposite the opening. In a use state, the pipe fitting to be processed penetrates into the through hole, the preset bottom hole and the open hole in the pipe wall of the pipe fitting to be processed are in the coaxial position, the stud is screwed into the threaded hole, so that the end part, close to the pipe fitting to be processed, of the stud is tightly abutted against the surface of the pipe fitting to be processed, the pipe fitting to be processed is tightly pressed on the inner wall of the through hole, and the pipe fitting to be processed and the outer die are fixed.
In the first and second embodiments, the push rod assembly 2 comprises the first push rod 21 and the second push rod 22, and the first push rod 21 and the second push rod 22 push the selected inner die 1 to move towards the preset bottom hole 31 in a manner of penetrating from both ends of the pipe 3 to be processed to move towards each other, which is only an alternative embodiment, and it will be understood by those skilled in the art that the push rod assembly may comprise nested first push rods and second push rods (as shown in fig. 13 to 17) or may be in other suitable forms, etc.
Embodiments in which the pusher bar assembly includes nested first and second pusher bars will now be described.
Referring to fig. 13 to 17, fig. 13 is an exploded view of a forming die and a pipe member to be processed according to a third embodiment of the present invention; fig. 14 is a top view of the forming die of the third embodiment of the present invention assembled with a pipe to be processed; FIG. 15 is a cross-sectional view taken along plane E-E of FIG. 14; fig. 16 is a plan view of a forming die according to a third embodiment of the present invention in a state where a flange is formed on a pipe wall of a pipe to be processed; fig. 17 is a cross-sectional view taken along plane F-F of fig. 16.
In a third embodiment of the present invention, as shown in fig. 13 to 17 and according to the orientation shown in fig. 15, the push rod assembly comprises a first push rod 21 and a second push rod 22, a guide structure 23, such as a ramp structure, is formed at the right end of the first push rod 21, a cavity 25 capable of allowing the first push rod 21 to pass through is formed at the middle part of the second push rod 22, and the cavity 25 is upwardly opened near the right end of the second push rod 22. In the using state, the second push rod 22 penetrates from the left end of the pipe fitting 3 to be processed to the position of the cavity 25 close to the alignment of the opening at the right end of the second push rod 22 and the preset bottom hole 31 and is kept still, and the selected inner die 1 is positioned in the cavity 25. The first push rod 21 penetrates the second push rod 22 from the left end of the cavity 25 and pushes it to the right, and the inclined plane structure of the guide structure 23 at the right end of the first push rod 21 extrudes the selected inner mold 1 to move the selected inner mold 1 toward the preset bottom hole 31, so that the selected inner mold 1 extrudes the preset bottom hole 31 to form a flange 32. It will be appreciated by those skilled in the art that the second push rod 22 can also be threaded from the right end of the tubular 3 to be processed.
Referring to fig. 18 with continued reference to fig. 8-12, fig. 18 is a diagram of the main steps of a tube bore flanging forming process according to an embodiment of the present invention.
As shown in fig. 18, the forming process of the pipe hole flanging mainly comprises the following steps:
s100, providing a plurality of internal molds;
s200, providing a push rod assembly;
s300, selecting an inner mold according to the target height of the flanging and the size of a preset bottom hole;
s400, moving the selected inner die into a position, corresponding to a preset bottom hole, in the pipe fitting to be processed;
s500, enabling the push rod assembly to enter the pipe fitting to be processed and pushing the selected inner die to move towards the direction of the preset bottom hole by a distance corresponding to the target height;
at least one part of the internal molds can freely enter the pipe fitting to be processed, and a preset bottom hole is formed in the pipe wall of the pipe fitting to be processed; the push rod assembly can freely enter the pipe fitting to be processed.
Specifically, in the process of flanging the pipe fitting 3 to be machined, a plurality of inner molds 1 and push rod assemblies 2 are provided, and one inner mold 1 is selected according to the aperture size of a bottom hole 31 preset in the pipe wall of the pipe fitting 3 to be machined and the target height of flanging. Specifically, the height of the flange 32 satisfies the formula: h is 1/2(D-D), wherein h is the height of the flanging, D is the diameter of the sphere (the selected inner die 1), and D is the aperture of the preset bottom hole 31. The diameter D of the sphere (selected inner mold 1) can be obtained according to the formula h ═ 1/2(D-D) based on the aperture D of the preset bottom hole 31 and the height h of the flange 32, and the inner mold 1 with the corresponding size is selected according to the diameter D of the obtained sphere (selected inner mold 1). Then, the selected inner die 1 is moved into the pipe 3 to be processed at a position corresponding to the predetermined bottom hole 31, for example, the selected inner die 1 is pushed into the pipe 3 to be processed at a position corresponding to the predetermined bottom hole 31 from the end of the pipe 3 to be processed by a dedicated push rod. And finally, penetrating the push rod assembly into the pipe fitting 3 to be processed from the end part of the pipe fitting 3 to be processed and pushing the selected inner die 1 to move towards the direction of the preset bottom hole 31 by a distance corresponding to the height of the flanging 32. As shown in fig. 8 to 12 and according to the orientation shown in fig. 10, preferably, the push rod assembly includes a first push rod 21 and a second push rod 22, the first push rod 21 and the second push rod 22 penetrate into the pipe 3 to be processed from two ends of the pipe 3 to be processed, and then the first push rod 21 and the second push rod 22 move towards each other, the first push rod 21 and the second push rod 33 push the selected inner mold 1, so that the selected inner mold 1 moves upwards by a distance corresponding to the height of the flange 32, and the selected inner mold 1 presses the preset bottom hole 31 to form the flange 32.
Preferably, the molding process further comprises the steps of:
and providing an outer die, wherein the outer die is used for being fixed at a position corresponding to the preset bottom hole outside the pipe fitting to be processed so as to form a flanging by matching the outer die with the selected inner die.
As shown in fig. 8 to 12, the outer molds include a first outer mold 41 and a second outer mold 42. The first outer die 41 and the second outer die 42 are respectively provided with a first semicircular groove 411 and a second semicircular groove 421 which are matched with the outer surface shape of the pipe fitting 3 to be processed, the first outer die 41 and the second outer die 42 are respectively provided with four first bolt holes 412 and four second bolt holes 422 at positions corresponding to four corners of the first outer die 41, and the middle part of the first outer die 41 is also provided with an opening 413. The first outer die 41 and the second outer die 42 sandwich the pipe 3 to be processed through the first semicircular groove 411 and the second semicircular groove 421, and the opening 413 is positioned coaxially with the preset bottom hole 31, and then the first outer die 41, the second outer die 42 and the pipe 3 to be processed are fixed together by bolts (not shown) inserted into the first bolt holes 412 and the second bolt holes 422. By providing the outer die and fixing the outer die and the pipe 3 to be processed together, the molding quality of the flange 32 is ensured.
As can be seen from the above description, in the technical scheme of the present invention, the tube hole flanging forming die includes a plurality of inner dies and a push rod assembly, at least a portion of the plurality of inner dies can freely enter the pipe to be processed, the push rod assembly can freely enter the pipe to be processed, and a preset bottom hole is formed in a tube wall of the pipe to be processed. The push rod assembly comprises a first push rod and a second push rod which can freely enter a pipe fitting to be processed, the first push rod and/or the second push rod form a guide structure on the end portions close to each other, and the guide structure is an outward inclined expanding structure from the direction away from the preset bottom hole to the direction close to the preset bottom hole. Preferably, an avoiding structure is formed on the expanding structure. In the process that the first push rod and the second push rod move in opposite directions to push the selected internal mold to move towards the direction of the preset bottom hole, the selected internal mold moves towards the direction of the preset bottom hole by means of the guide structure, and the moving distance of the selected internal mold towards the direction of the preset bottom hole is increased by matching the end parts, close to each other, of the first push rod and/or the second push rod with the avoidance structure. Through the cooperation of the push rod assembly and the inner die, a flanging can be conveniently formed at the preset bottom hole of the pipe wall of the pipe fitting to be processed. And the forming die is not limited by the size of a preset bottom hole on the pipe wall of the pipe fitting to be processed, so that the application range is expanded.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. The utility model provides a flanging of pipe hole forming die which characterized in that, forming die includes:
at least one part of the plurality of inner molds can freely enter the pipe fitting to be processed, and a preset bottom hole is formed in the pipe wall of the pipe fitting to be processed; and
the push rod assembly can freely enter the pipe fitting to be processed; and is
Under the condition that the push rod assembly and the selected inner die both enter the pipe fitting to be processed, the push rod assembly can push the selected inner die to move towards the direction of the preset bottom hole at the position corresponding to the preset bottom hole so as to extrude the preset bottom hole to form the flanging.
2. The forming die of claim 1, wherein the push rod assembly comprises a first push rod and a second push rod which can freely enter the pipe to be processed,
and under the condition that the push rod assembly and the selected inner die both enter the pipe fitting to be processed, the selected inner die is positioned between the first push rod and the second push rod so as to enable the first push rod and the second push rod to push the selected inner die in a mode of opposite movement.
3. The forming die of claim 2, wherein the first push rod and/or the second push rod form a guide structure at ends close to each other so as to
In the process that the first push rod and the second push rod move oppositely, the selected inner die can move towards the direction of the preset bottom hole by means of the guide structure.
4. The molding die of claim 3, wherein the guide structure is a divergent structure that is inclined outward from a direction away from the predetermined bottom hole toward a direction close to the predetermined bottom hole.
5. The forming die of claim 4, wherein the expanding structure is formed with an avoiding structure,
and in the process that the first push rod and the second push rod push the selected inner die to move towards the direction of the preset bottom hole in a mode of opposite movement, the moving distance of the selected inner die towards the direction of the preset bottom hole is increased through the matching of the end parts, close to each other, of the first push rod and/or the second push rod and the avoidance structure.
6. The forming die according to any one of claims 1 to 5, wherein the inner die is a spherical structure.
7. The forming die as claimed in any one of claims 1 to 5, wherein the forming die comprises an outer die, and the outer die is used for being fixed at a position corresponding to the preset bottom hole outside the pipe to be processed, so that the flange is formed by matching the outer die and the selected inner die.
8. The forming process of the pipe hole flanging is characterized by comprising the following steps of:
providing a plurality of inner dies, wherein at least one part of the inner dies can freely enter the pipe fitting to be processed, and a preset bottom hole is formed in the pipe wall of the pipe fitting to be processed;
providing a push rod assembly which can freely enter the pipe to be processed;
selecting an inner mold according to the target height of a flanging formed on a preset bottom hole and the size of the preset bottom hole;
moving the selected inner die into a position corresponding to the preset bottom hole in the pipe fitting to be processed;
and the push rod assembly enters the pipe fitting to be processed and pushes the selected inner die to move towards the direction of the preset bottom hole by a distance corresponding to the target height.
9. The molding process according to claim 8, wherein the push rod assembly comprises a first push rod and a second push rod both capable of freely entering into the pipe to be processed,
the step of enabling the push rod assembly to enter the pipe fitting to be machined and push the selected inner die to move towards the direction of the preset bottom hole by the distance corresponding to the target height specifically comprises the following steps of:
respectively enabling the first push rod and the second push rod to enter the pipe fitting from two ends of the pipe fitting to be machined, and enabling the selected inner die to be located between the first push rod and the second push rod;
and enabling the first push rod and the second push rod to push the selected inner die to move towards the direction of the preset bottom hole by a distance corresponding to the target height in a mode of opposite movement.
10. The molding process according to claim 8 or 9, further comprising the steps of:
providing an outer mold;
the outer die is used for being fixed at a position, corresponding to the preset bottom hole, outside the pipe fitting to be machined, so that the flanging is formed through the matching of the outer die and the selected inner die.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910013047.4A CN111408644A (en) | 2019-01-07 | 2019-01-07 | Forming die and forming process for pipe hole flanging |
| PCT/CN2020/070643 WO2020143607A1 (en) | 2019-01-07 | 2020-01-07 | Forming mold for tube hole flanging, and forming process therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910013047.4A CN111408644A (en) | 2019-01-07 | 2019-01-07 | Forming die and forming process for pipe hole flanging |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111408644A true CN111408644A (en) | 2020-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910013047.4A Pending CN111408644A (en) | 2019-01-07 | 2019-01-07 | Forming die and forming process for pipe hole flanging |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN111408644A (en) |
| WO (1) | WO2020143607A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113333500A (en) * | 2019-02-22 | 2021-09-03 | 四川龙立可不锈钢管业有限公司 | Method for processing bypass branch pipe of pipeline |
| CN116276106A (en) * | 2023-03-05 | 2023-06-23 | 广州市迅兴精密工业有限公司 | Hole flanging processing die for automobile die metal stamping part |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2020143607A1 (en) | 2020-07-16 |
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Application publication date: 20200714 |