Necking and flaring die and pipe fitting machining structure

Abstract

The utility model relates to the technical field of pipe fitting machining, in particular to a flaring and necking die and a pipe fitting machining structure. The expanding and necking die comprises an outer die and an inner die, the outer die is provided with a machining cavity and a guide cavity which are communicated with each other, at least part of the inner die is installed in the machining cavity through the guide cavity and detachably connected to the outer die, and the outer side wall of the inner die and the inner side wall of the machining cavity are arranged at intervals in the radial direction of the inner die. Wherein a guide section is arranged at one end of the inner die, the inner diameter of the guide cavity is gradually reduced in the axial direction of the outer die and in the direction from the guide cavity to the machining cavity, and the outer diameter of the guide section is gradually increased. According to the expanding and necking die and the pipe fitting machining structure, the problems of high die cost and low machining efficiency existing in machining of pipe fittings with different pipe diameters in the prior art are solved.

Description

Technical Field

[0001] The present application relates to the technical field of pipe fitting processing, and in particular to an expansion and contraction die and a pipe fitting processing structure. Background Art

[0002] At present, in the processing of air-conditioning pipe fittings, it is often necessary to expand or shrink the pipe fittings to meet different connection requirements.

[0003] However, in traditional technology, different diameter pipes often require different molds to achieve expansion and contraction. For example, large diameter pipes require a special contraction mold for contraction, and small diameter pipes require a special expansion mold for expansion. The molds cannot be shared between the two, resulting in more molds required to process pipes with different diameters, resulting in higher mold costs. In addition, when replacing the mold, it is necessary to disassemble and clamp it multiple times, which is cumbersome and reduces processing efficiency. Utility Model Content

[0004] Based on this, it is necessary to provide an expansion and contraction mold and a pipe fitting processing structure to solve the problems of high mold cost and low processing efficiency in the existing processing of pipe fittings with different diameters.

[0005] The present application provides an expansion and contraction mold, which is used to change the diameter of a pipe fitting. The expansion and contraction mold includes an outer mold and an inner mold. The outer mold is provided with a processing cavity and a guide cavity that are interconnected. The inner mold is at least partially installed in the processing cavity through the guide cavity and is detachably connected to the outer mold. Along the radial direction of the inner mold, the outer wall of the inner mold and the inner wall of the processing cavity are spaced apart; wherein, a guide section is provided at one end of the inner mold, and along the axial direction of the outer mold and in the direction from the guide cavity to the processing cavity, the inner diameter of the guide cavity gradually decreases, and the outer diameter of the guide section gradually increases.

[0006] In one embodiment, the cross-sections of the guide cavity and the guide section are both conical, and along the axial direction of the outer mold, the guide section extends out of the guide cavity.

[0007] In one embodiment, the cone angle of the guide cavity ranges from 35° to 45°, and / or the cone angle of the guide section ranges from 35° to 45°.

[0008] In one embodiment, the inner mold and the processing cavity are coaxially arranged.

[0009] In one embodiment, a plane parallel to the axis of the outer mold is defined as a projection plane, and along the radial direction of the inner mold, the projection of the expanded cone surface on the projection plane and the projection of the outer mold on the projection plane do not overlap each other.

[0010] In one of the embodiments, the outer mold is further provided with a through hole, which is arranged at one end of the processing cavity away from the guide cavity and is connected to the processing cavity, and the inner mold is provided with a threaded hole corresponding to the through hole; the expansion and contraction mold also includes a fastener, which passes through the through hole and is threadedly connected to the threaded hole to detachably connect the outer mold and the inner mold.

[0011] In one of the embodiments, the outer mold is also provided with an assembly hole, and the assembly hole is connected to the processing cavity through the through hole; the fastener includes a head and a rod, the head is accommodated in the assembly hole and cooperates with the bottom wall stop of the assembly hole, one end of the rod is connected to the head, and the other end passes through the through hole and is threadedly cooperated with the threaded hole.

[0012] In one embodiment, the outer mold includes a main body and a connecting portion, wherein the connecting portion protrudes and is connected to one axial end of the main body for connecting to a driving member.

[0013] The present application also provides a pipe processing structure, which includes a pipe, a driving member and the expansion and contraction mold described in any one of the above embodiments, wherein the output end of the driving member is connected to the expansion and contraction mold to drive the expansion and contraction mold to move toward the pipe.

[0014] In one of the embodiments, along the radial direction of the inner mold, the gap between the outer wall of the inner mold and the inner wall of the processing cavity is less than or equal to the wall thickness of the tube.

[0015] Compared with the prior art, the expansion and contraction mold and pipe processing structure provided by the present application, when the large diameter pipe fitting needs to be contracted, the end of the large diameter pipe fitting can be set against the inner wall of the guide cavity on the outer mold, and as the large diameter pipe fitting moves toward the processing cavity, the inner diameter of the guide cavity gradually decreases, and the diameter of the large diameter pipe fitting will also gradually decrease, thereby realizing the contraction of the large diameter pipe fitting. When the small diameter pipe fitting needs to be expanded, the end of the small diameter pipe fitting can be set against the outer wall of the guide section on the inner mold, and as the small diameter pipe fitting moves toward the processing cavity, the outer diameter of the guide section gradually increases, and the diameter of the small diameter pipe fitting will also gradually increase, thereby realizing the expansion of the small diameter pipe fitting. In this way, the contraction of large diameter pipe fittings and the expansion of small diameter pipe fittings can be realized simultaneously on one expansion and contraction mold, the operation is simple, and there is no need to replace a new mold, which effectively reduces the mold cost and greatly improves the processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A cross-sectional view of an expansion and contraction mold according to an embodiment of the present application.

[0018] The symbols in the figure mean the following:

[0019] 100, expansion and contraction mold; 10, outer mold; 101, processing cavity; 102, guide cavity; 103, through hole; 104, assembly hole; 11, main body; 12, connecting part; 20, inner mold; 201, threaded hole; 21, guide section; 30, fastener; 301, operating hole; 31, head; 32, rod. DETAILED DESCRIPTION

[0020] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0021] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0023] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are in contact indirectly through an intermediate medium. Moreover, a first feature being “above”, “above”, or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0024] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0025] At present, in the processing of air-conditioning pipe fittings, it is often necessary to expand or shrink the pipe fittings to meet different connection requirements.

[0026] However, in traditional technology, different diameter pipes often require different molds to achieve expansion and contraction. For example, large diameter pipes require a special contraction mold for contraction, and small diameter pipes require a special expansion mold for expansion. The molds cannot be shared between the two, resulting in more molds required to process pipes with different diameters, resulting in higher mold costs. In addition, when replacing the mold, it is necessary to disassemble and clamp it multiple times, which is cumbersome and reduces processing efficiency.

[0027] See also Figure 1 In order to solve the problems of high mold cost and low processing efficiency in the existing processing of pipe fittings with different diameters, the present application provides an expansion and contraction mold 100, which is used to change the diameter of the pipe fitting (not shown), and is mainly used for contracting large-diameter pipe fittings and expanding small-diameter pipe fittings.

[0028] Please continue reading Figure 1 The expansion and contraction mold 100 provided in the present application includes an outer mold 10 and an inner mold 20. The outer mold 10 is provided with a processing cavity 101 and a guide cavity 102 that are interconnected. The inner mold 20 is at least partially installed in the processing cavity 101 through the guide cavity 102 and is detachably connected to the outer mold 10. In the radial direction of the inner mold 20, the outer wall of the inner mold 20 and the inner wall of the processing cavity 101 are arranged at intervals. Among them, a guide section 21 is provided at one end of the inner mold 20. In the axial direction of the outer mold 10 and in the direction from the guide cavity 102 to the processing cavity 101, the inner diameter of the guide cavity 102 gradually decreases, and the outer diameter of the guide section 21 gradually increases.

[0029] It is understandable that when a large-diameter pipe fitting needs to be shrunken, the end of the large-diameter pipe fitting can be set against the inner wall of the guide cavity 102 on the outer mold 10. As the large-diameter pipe fitting moves toward the processing cavity 101, the inner diameter of the guide cavity 102 gradually decreases, and the diameter of the large-diameter pipe fitting will also gradually decrease, thereby achieving the shrinking of the large-diameter pipe fitting. When a small-diameter pipe fitting needs to be expanded, the end of the small-diameter pipe fitting can be set against the outer wall of the guide section 21 on the inner mold 20. As the small-diameter pipe fitting moves toward the processing cavity 101, the outer diameter of the guide section 21 gradually increases, and the diameter of the small-diameter pipe fitting will also gradually increase, thereby achieving the expansion of the small-diameter pipe fitting. In this way, the shrinking of large-diameter pipe fittings and the expansion of small-diameter pipe fittings can be achieved simultaneously on one expansion and contraction mold 100. The operation is simple, and there is no need to replace a new mold, which effectively reduces the mold cost and greatly improves the processing efficiency.

[0030] Specifically, in one embodiment, the cross-sections of the guide cavity 102 and the guide section 21 are both conical, and the conical structure facilitates uniform expansion or contraction of the pipe and avoids large deformation of the pipe, thereby improving the forming rate of expansion and contraction of the pipe.

[0031] In one embodiment, the cone angle of the guide cavity 102 is in the range of 35° to 45°, so that the inner wall of the guide cavity 102 can play a good guiding role in the movement of the large-diameter pipe fitting, thereby facilitating the shrinkage of the large-diameter pipe fitting.

[0032] Among them, the cone angle of the guide cavity 102 is preferably set to 40°. Of course, it can also be set to 35°, 37°, 39°, 41°, 43° or 45°, etc., which are not listed here one by one.

[0033] Furthermore, in one embodiment, the cone angle of the guide section 21 is in the range of 35° to 45°. Similarly, in this configuration, the outer wall of the guide section 21 can play a good guiding role in the movement of the small-diameter pipe fitting, thereby facilitating the expansion of the small-diameter pipe fitting.

[0034] Among them, the cone angle of the guide section 21 is preferably set to 40°. Of course, it can also be set to 35°, 37°, 39°, 41°, 43° or 45°, etc., which are not listed here one by one.

[0035] It should be noted that the cone angle refers to the angle between two generatrixes on the axial section (the section passing through the axis of the cone) of the cone where the guide cavity 102 and the guide section 21 are located.

[0036] However, it is not limited thereto. In other embodiments, the cross-sections of the guide cavity 102 and the guide section 21 may also be set to other shapes, such as an elliptical shape, as long as the same guiding expansion or contraction effect can be achieved.

[0037] In one embodiment, the guide section 21 is extended out of the guide cavity 102 along the axial direction of the outer mold 10, so that the guide section 21 is easy to observe. When the pipe is against the surface of the guide section 21, the position of the pipe relative to the inner mold 20 can be controlled and adjusted, which is beneficial to improve the coaxiality of the pipe and the inner mold 20, so that the wall thickness of the pipe after expansion is uniform.

[0038] Furthermore, in one embodiment, a plane parallel to the axis of the outer mold 10 is defined as a projection plane, and along the radial direction of the inner mold 20, the projection of the guide section 21 on the projection plane does not overlap with the projection of the outer mold 10 on the projection plane. In this way, when pipes of different diameters are against the surface of the guide section 21, the coaxiality of the pipes and the inner mold 20 can be effectively controlled, thereby further improving the reliability of pipe processing.

[0039] Usually, when shrinking or expanding a pipe fitting, it is necessary to ensure not only the outer diameter of the pipe fitting, but also the inner diameter of the pipe fitting. In traditional molds, since they can only play a single expansion and shrinking function, here taking the shrinking of a pipe fitting as an example, at this time, only the outer diameter of the pipe fitting can be guaranteed, but the inner diameter of the pipe fitting cannot be controlled. Therefore, it is often necessary to replace the mold to further process the inner diameter of the pipe fitting. The replacement of the mold requires the mold to be re-clamped, which is not conducive to the control of the concentricity between it and the pipe fitting, and it is easy to reduce the processing quality of the pipe fitting.

[0040] To solve the above problem, in one embodiment of the present application, along the radial direction of the inner mold 20, the gap between the outer wall of the inner mold 20 and the inner wall of the processing cavity 101 can be set to be less than or equal to the wall thickness of the pipe. In this way, when the pipe is shrinking or expanding, by extending the end of the pipe into the gap between the outer wall of the inner mold 20 and the inner wall of the processing cavity 101, it can be ensured that the wall thickness at the pipe mouth is the thickness of the gap. In other words, the inner and outer diameter requirements of the pipe can be met at the same time in one processing, without the need to adjust the mold multiple times, which not only improves the quality stability of the pipe after processing, but also effectively reduces the number of processing times, thereby greatly improving the processing efficiency and reducing the processing cost.

[0041] It can be understood that the outer diameter of the pipe fitting at the pipe opening is equal to the inner diameter of the processing cavity 101 , and the inner diameter of the pipe fitting at the pipe opening is equal to the outer diameter of the inner mold 20 .

[0042] Furthermore, in one embodiment, the inner mold 20 and the processing cavity 101 are coaxially arranged, so as to further ensure the uniformity of the wall thickness at the pipe mouth after the pipe is expanded or shrunk, and prevent the uneven thickness phenomenon, thereby facilitating the further improvement of the quality of the pipe.

[0043] In one embodiment, if Figure 1As shown, the outer mold 10 is further provided with a through hole 103, which is arranged at one end of the processing cavity 101 away from the guide cavity 102 and communicates with the processing cavity 101, and the inner mold 20 is provided with a threaded hole 201 corresponding to the through hole 103. The expansion and contraction mold 100 further includes a fastener 30, which passes through the through hole 103 and is threadedly connected to the threaded hole 201, so as to detachably connect the outer mold 10 and the inner mold 20.

[0044] The outer mold 10 and the inner mold 20 are connected by the fastener 30 , which is simple to connect and can improve the connection efficiency of the inner mold 20 and the outer mold 10 . At the same time, it can also ensure the connection strength of the inner mold 20 and the outer mold 10 .

[0045] Furthermore, in one embodiment, the outer mold 10 is further provided with an assembly hole 104, and the assembly hole 104 is connected to the processing cavity 101 through the through hole 103. The fastener 30 includes a head 31 and a rod 32, the head 31 is accommodated in the assembly hole 104 and cooperates with the bottom wall stopper of the assembly hole 104, one end of the rod 32 is connected to the head 31, and the other end passes through the through hole 103 and is threadedly engaged with the threaded hole 201.

[0046] In this way, all of the fasteners 30 are contained inside the outer mold 10 , which can reduce the probability of interference between the fasteners 30 and other structures, thereby ensuring the reliability of the connection between the fasteners 30 and the outer mold 10 and the inner mold 20 .

[0047] Since the fastener 30 is completely contained inside the outer mold 10, it is more difficult for the fastener 30 to cooperate with external tools. Therefore, in order to reduce the difficulty of rotating the fastener 30, an operating hole 301 may be opened on the fastener 30, wherein the shape of the operating hole 301 is preferably set to be a hexagon.

[0048] In one embodiment, the outer mold 10 includes a main body portion 11 and a connecting portion 12 . The connecting portion 12 protrudes and is connected to one axial end of the main body portion 11 for connecting to a driving member.

[0049] It is understandable that the expansion and contraction die 100 of the present application is connected to the output end of the driving member during operation, so that it can achieve axial movement under the drive of the driving member to perform expansion or contraction processing on the pipe fitting. At this time, by setting the connecting portion 12 to be connected to the driving member, the connection difficulty between the expansion and contraction die 100 and the driving member can be reduced, and at the same time, it is conducive to improving the installation stability of the expansion and contraction die 100, thereby achieving stable movement of the expansion and contraction die 100 along the axial direction.

[0050] Specifically, the processing cavity 101 , the guide cavity 102 and the through hole 103 are all opened in the main body 11 , the assembly hole 104 is opened in the connecting portion 12 , and at least a part of the assembly hole 104 extends into the main body 11 and communicates with the through hole 103 .

[0051] The present application also provides a pipe processing structure, which includes a pipe, a driving member and an expansion and contraction mold 100 of any one of the above embodiments, wherein the output end of the driving member is connected to the expansion and contraction mold 100, and is used to drive the expansion and contraction mold 100 to move toward the pipe, thereby realizing expansion or contraction processing of the pipe.

[0052] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0053] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. An expansion and contraction die for changing the diameter of a pipe, characterized in that: The expansion and contraction mold comprises an outer mold (10) and an inner mold (20), the outer mold (10) is provided with a processing cavity (101) and a guide cavity (102) which are interconnected, the inner mold (20) is at least partially installed in the processing cavity (101) through the guide cavity (102) and is detachably connected to the outer mold (10), and along the radial direction of the inner mold (20), the outer side wall of the inner mold (20) and the inner side wall of the processing cavity (101) are spaced apart; A guide section (21) is provided at one end of the inner mold (20), and along the axial direction of the outer mold (10) and in the direction from the guide cavity (102) to the processing cavity (101), the inner diameter of the guide cavity (102) gradually decreases, and the outer diameter of the guide section (21) gradually increases.

2. The expansion and contraction mold according to claim 1, characterized in that: The cross sections of the guide cavity (102) and the guide section (21) are both conical, and along the axial direction of the outer mold (10), the guide section (21) extends out of the guide cavity (102).

3. The expansion and contraction mold according to claim 2, characterized in that: The cone angle range of the guide cavity (102) is 35° to 45°, and / or the cone angle range of the guide section (21) is 35° to 45°.

4. The expansion and contraction mold according to any one of claims 1 to 3, characterized in that: The inner mold (20) and the processing cavity (101) are coaxially arranged.

5. The expansion and contraction mold according to any one of claims 1 to 3, characterized in that: A plane parallel to the axis of the outer mold (10) is defined as a projection plane, and along the radial direction of the inner mold (20), the projection of the guide section (21) on the projection plane and the projection of the outer mold (10) on the projection plane do not overlap each other.

6. The expansion and contraction mold according to any one of claims 1 to 3, characterized in that: The outer mold (10) is further provided with a through hole (103), the through hole (103) being provided at one end of the processing cavity (101) away from the guide cavity (102) and being in communication with the processing cavity (101), and the inner mold (20) is provided with a threaded hole (201) corresponding to the through hole (103); The expansion and contraction mold further comprises a fastener (30), wherein the fastener (30) passes through the through hole (103) and is threadedly connected to the threaded hole (201) so as to detachably connect the outer mold (10) and the inner mold (20).

7. The expansion and contraction mold according to claim 6, characterized in that: The outer mold (10) is also provided with an assembly hole (104), and the assembly hole (104) is connected to the processing cavity (101) through the through hole (103); The fastener (30) comprises a head (31) and a rod (32); the head (31) is accommodated in the assembly hole (104) and cooperates with a bottom wall stopper of the assembly hole (104); one end of the rod (32) is connected to the head (31), and the other end passes through the through hole (103) and is threadedly cooperated with the threaded hole (201).

8. The expansion and contraction mold according to claim 1, characterized in that: The outer mold (10) comprises a main body (11) and a connecting part (12); the connecting part (12) protrudes from and is connected to one axial end of the main body (11) and is used for connecting a driving member.

9. A pipe processing structure, characterized in that: It comprises a pipe fitting, a driving member and an expansion / contraction mold as described in any one of claims 1 to 8, wherein the output end of the driving member is connected to the expansion / contraction mold for driving the expansion / contraction mold to move toward the pipe fitting.

10. The pipe processing structure according to claim 9, characterized in that: Along the radial direction of the inner mold (20), the gap between the outer wall of the inner mold (20) and the inner wall of the processing cavity (101) is less than or equal to the wall thickness of the tube.

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