CN210450610U

CN210450610U - Split die for bent pipe

Info

Publication number: CN210450610U
Application number: CN201921451811.8U
Authority: CN
Inventors: 王朝永; 王小龙
Original assignee: Henan Yongfude Science & Technology Co ltd
Current assignee: Henan Yongfude Science & Technology Co ltd
Priority date: 2019-09-02
Filing date: 2019-09-02
Publication date: 2020-05-05
Anticipated expiration: 2029-09-02

Abstract

The application relates to the field of elbow processing, in particular to an elbow split die. The parting surface of the bend pipe split mold is a curved surface, the bend pipe split mold is provided with a mold cavity extending along a first direction, and the bend pipe split mold comprises a base body, an upper mold and a lower mold component; the lower die assembly comprises a fixed lower die and a first sliding lower die; the first sliding lower die is provided with a first guide part; the upper die is provided with a second guide part matched with the first guide part, and when the upper die moves downwards, the first guide part can be abutted against the second guide part and moves relatively to enable the first sliding lower die to be close to the fixed lower die and to be matched with the fixed lower die. When the upper die presses the straight pipe, the first sliding lower die and the fixed lower die are close to each other, and the bending stress of the straight pipe is released in the process of the mutual close. Stress concentration is eliminated, the problem of uneven thickness of the bent pipe is solved, and the quality of the bent pipe is improved.

Description

Split die for bent pipe

Technical Field

The application relates to the field of elbow processing, in particular to an elbow split die.

Background

In the prior art, most bent pipes are formed by pressing straight pipes, but in the pressing process, the stress at different positions in the length direction of the pipe body is different, so that the pressing is not easy to control, and finally the wall thickness difference at different positions in the length direction of the bent pipe is large.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of this application is to provide an return bend components of a whole that can function independently mould, it aims at improving the not good problem of return bend quality of current return bend mould suppression.

This application first aspect provides a return bend components of a whole that can function independently mould, and the die joint of return bend components of a whole that can function independently mould is the curved surface, and return bend components of a whole that can function independently mould is provided with the die cavity that extends along first direction, and return bend components of a whole that can function independently mould includes the base member, goes up mould and lower mould component.

The lower die assembly comprises a fixed lower die and a first sliding lower die, and the fixed lower die is fixedly connected with the base body; the first sliding lower die is connected with the base body in a sliding mode and can move along a first direction to be close to or far away from the fixed lower die; the first sliding lower die is provided with a first guide part;

the upper die is provided with a second guide part matched with the first guide part, and when the upper die moves downwards, the first guide part can be abutted against the second guide part and moves relatively to enable the first sliding lower die to be close to the fixed lower die and to be matched with the fixed lower die.

In the process of driving the upper die to press downwards, the straight pipe bends and shrinks towards the middle, and the straight pipe deforms to generate bending stress. Go up the mould and fix the straight tube middle part with fixed lower mould, can avoid straight tube middle part position to remove, the clearance between first slip lower mould and the fixed lower mould reduces gradually, and first slip lower mould is close to the bending stress of release straight tube each other with fixed lower mould, avoids the straight tube compression in-process because stress concentration and lead to the turn pipe uneven thickness and the crack scheduling problem appears, improves the quality of return pipe. The first guide part is matched with the second guide part, so that the first sliding lower die can spontaneously approach to the fixed lower die in the die closing process, and no additional external drive is needed. The precision can be well controlled while the manufacturing cost of the equipment is saved.

In some embodiments of the first aspect of the present application, the first guide portion has a first guide surface and the second guide portion has a second guide surface, the first guide surface and the second guide surface being at least partially conformable when the upper die is moved downward.

The first guide part can abut against the second guide part and move relatively stably through at least partial fitting of the first guide surface and the second guide surface.

In some embodiments of the first aspect of the present application, the first sliding lower die is convexly provided with a wedge block, and the first guide surface is located on the wedge block and faces away from the fixed lower die; the upper die is provided with a clamping groove matched with the wedge-shaped block, and the second guide surface is located on the side wall of the clamping groove and faces the fixed lower die.

Or the upper die is convexly provided with a wedge-shaped block, and the second guide surface is positioned on the wedge-shaped block and faces the fixed lower die; the first sliding lower die is provided with a clamping groove matched with the wedge-shaped block, and the first guide surface is located on the side wall of the clamping groove and faces away from the fixed lower die.

Through the cooperation of wedge and draw-in groove, realize that first guide portion can support with the second guide portion and hold and move relatively steadily. The wedge has better positioning action, and in the process of the first slip lower mould of last mould contact, the wedge can stretch into the draw-in groove comparatively accurately.

In some embodiments of the first aspect of the present application, after clamping, the facing surfaces of the stationary lower die and the first sliding lower die correspond to the locations of peaks or valleys of the mold cavity.

The straight pipe is contracted after being compressed, and the bending stress of the straight pipe is larger at the positions corresponding to the wave crests and the wave troughs of the bent pipe. Therefore, the gaps between the fixed lower die and the first sliding lower die are arranged at the positions corresponding to the wave crests or the wave troughs of the die cavity, so that the release of stress is facilitated, and the influence of poor quality caused by different stresses is reduced.

In some embodiments of the first aspect of the present application, the split elbow die further includes a limiting member disposed on one side or both sides of the first sliding lower die, and the limiting member has an abutting surface extending along the first direction and abutting against the first sliding lower die; the locating part is fixedly connected with the base body or the upper die.

The abutting surface of the limiting part abuts against the first sliding lower die to limit the first sliding lower die to move along the direction vertical to the first direction.

In some embodiments of the first aspect of the present application, the lower die assembly further comprises a second slide lower die.

The second sliding lower die is connected with the base body in a sliding mode and arranged on one side, away from the first sliding lower die, of the fixed lower die; the second sliding lower die is provided with a third guide part;

the upper die is provided with a fourth guide part matched with the third guide part, and when the upper die moves downwards, the third guide part can be abutted against the fourth guide part and moves relatively to enable the second sliding lower die to be close to the fixed lower die and to be matched with the fixed lower die.

When the bent pipe split mold is used, when the upper mold is pressed down, the straight pipe is bent and contracted towards the middle, and the straight pipe deforms to generate stress. The upper die and the fixed lower die are used for fixing the middle part of the straight pipe, and the gap between the first sliding lower die and the fixed lower die is gradually reduced to release the stress of the straight pipe; the clearance between the second sliding lower die 5 and the fixed lower die is gradually reduced, and the stress of the straight pipe is released. When the pipe length is longer, the lower die assembly is provided with at least two stress release gaps, so that the problem of uneven thickness caused by inconsistent contraction of each point due to stress concentration can be well avoided, and the quality of the bent pipe is improved.

In some embodiments of the first aspect of the present application, the lower die assembly further comprises a third slide lower die.

The third sliding lower die is connected with the base body in a sliding mode and arranged on one side, away from the fixed lower die, of the first sliding lower die; the third sliding lower die is provided with a fifth guide part;

and the upper die is provided with a sixth guide part matched with the fifth guide part, and when the upper die descends, the sixth guide part can be abutted against the fifth guide part and relatively moves so that the third sliding lower die can be close to the fixed lower die and is matched with the die.

When the bent pipe split mold is used, when the upper mold is pressed down, the straight pipe is bent and contracted towards the middle, and the straight pipe deforms to generate stress. The upper die and the fixed lower die are used for fixing the middle part of the straight pipe, and the gap between the first sliding lower die and the fixed lower die is gradually reduced to release the stress of the straight pipe; the clearance between the third sliding lower die and the fixed lower die is gradually reduced, and the stress of the straight pipe is released.

In some embodiments of the first aspect of the present application, the elbow split mold is provided with a plurality of mold cavities arranged side by side.

The bending pipe split mold is provided with a plurality of mold cavities, and a plurality of multi-connected elbow forming blanks, namely a plurality of multi-bent pipes, can be obtained by one-time pressing.

In some embodiments of the first aspect of the present application, the mold cavity comprises a first straight section, a bent section, and a second straight section connected in series.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 is a schematic diagram illustrating a first state of a split elbow mold according to an embodiment of the present disclosure;

FIG. 2 is a schematic structural diagram illustrating a second state of a split elbow mold according to an embodiment of the present disclosure;

FIG. 3 is a schematic structural diagram illustrating another perspective view of a second state of a split elbow mold according to an embodiment of the present application;

FIG. 4 illustrates a schematic cross-sectional view of several mold cavities provided by embodiments of the present application;

FIG. 5 is a schematic structural diagram of an upper mold provided in an embodiment of the present application;

fig. 6 shows two embodiments of the first guide part and the second guide part provided in the examples of the present application;

FIG. 7 is a schematic structural diagram illustrating a first state of a lower die assembly according to an embodiment of the present application;

FIG. 8 is a schematic structural diagram illustrating a second state of a lower die assembly according to an embodiment of the present application;

fig. 9 is a schematic structural view of a first sliding lower die provided in an embodiment of the present application;

fig. 10 shows a schematic structural view of a fixed lower die and a first sliding lower die provided in an embodiment of the present application.

Icon: 100-bending the pipe split mould; 11-a first direction; 101-a mold cavity; 102-a first straight tube segment; 103-bending the pipe section; 104-a second straight tube section; 110-a substrate; 120-upper die; 121-a second guide; 122-a second guide surface; 123-card slot; 124-a fourth guide; 130-a lower die assembly; 131-fixing the lower die; 132-a first sliding lower die; 133-a first guide; 134-a first guide face; 135-wedge block; 140-a stop; 150-a second sliding lower die; 151-third guide portion.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the embodiments of the present application, it should be understood that the terms "upper", "lower", and the like refer to orientations or positional relationships based on those shown in the drawings, or orientations or positional relationships that are conventionally arranged when products of the application are used, or orientations or positional relationships that are conventionally understood by those skilled in the art, and are used for convenience of description and simplification of the description, but do not refer to or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be considered as limiting the present application.

Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, and may for example be fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Examples

Fig. 1 shows a schematic structural diagram of a first state of an elbow split mold 100 provided in an embodiment of the present application, fig. 2 shows a schematic structural diagram of a second state of the elbow split mold 100 provided in the embodiment of the present application, fig. 3 shows a schematic structural diagram of another perspective view of the second state of the elbow split mold 100 provided in the embodiment of the present application, please refer to fig. 1 to fig. 3, the embodiment provides an elbow split mold 100, which is mainly used for pressing a straight pipe into an elbow pipe. Elbows may be used to make the elbows.

The parting surface of the bend pipe split mold 100 is a curved surface, the curved surface is a surface different from a plane, the shape of the curved surface can be set according to the shape of a target bend pipe, and the specific shape of the curved surface is not limited in the present application.

In this embodiment, the parting surface is a wave shape with smooth transition, and the parting surface includes a first plane, a curved surface with smooth transition, and a second plane that are consecutive in sequence along the first direction 11.

The elbow split mold 100 is provided with a mold cavity 101 extending in the first direction 11. In this embodiment, the elbow split mold 100 is provided with two mold cavities 101 arranged side by side, and the two mold cavities 101 are arranged at an interval. In other embodiments of the present application, the elbow split mold 100 may also include only one mold cavity 101, or may include three, four, or more mold cavities 101. The mold cavities 101 are arranged in parallel. The bend split mold 100 is provided with a plurality of mold cavities 101, so that a plurality of multi-connected elbow molding blanks, namely a plurality of multi-bends, can be obtained by one-time pressing. The term "plurality" as described in this application refers to two or more.

Fig. 4 shows a schematic cross-sectional view of several mold cavities 101 provided in the embodiment of the present application, showing three cross-sectional views, i, m, and n, of the mold cavity 101 from top to bottom, wherein the uppermost view, i, shows the cross-sectional shape of the mold cavity 101 of the embodiment shown in fig. 2.

In this embodiment, the mold cavity 101 comprises a first straight pipe section 102, a bent pipe section 103 and a second straight pipe section 104 connected in series. The first straight section 102 and the second straight section 104 refer to a lumen extending in the first direction 11, the bend section 103 is substantially wave-shaped, and the bend section 103 shown in the uppermost l of fig. 4 has four wave crests and four wave troughs. Further, the elbow section 103 may have a lumen with one, two, three or more inflection points. In other words, the wavy pipe bend 103 may have at least one peak, or at least one valley. Referring again to fig. 4, in other embodiments of the present application, the shape of the mold cavity 101 may also be as shown by m or n in fig. 4. For example, the mold cavity 101 includes a straight section, a curved section, and a straight section connected in series. Alternatively, the mold cavity 101 includes a straight segment, a curved segment, and a straight segment connected in sequence. Accordingly, in the present application, the length of the curved section and the straight section is not limited.

Referring again to fig. 1, 2 and 3, the elbow split mold 100 includes a base 110, an upper mold 120 and a lower mold assembly 130. The base 110 is mainly used to support the lower mold assembly 130, and the upper mold 120 and the lower mold assembly 130 are clamped to form the mold cavity 101.

The lower die assembly 130 comprises a fixed lower die 131 and a first sliding lower die 132, and the fixed lower die 131 is fixedly connected with the base 110; the first sliding lower die 132 is slidably coupled to the base 110, and the first sliding lower die 132 is movable in the first direction 11 to approach or separate from the fixed lower die 131; the first slide lower die 132 is provided with a first guide portion 133.

The upper die 120 is provided with a second guide portion 121 matched with the first guide portion 133, and when the upper die 120 descends, the first guide portion 133 can abut against the second guide portion 121 and move relatively to cause the first sliding lower die 132 to approach the fixed lower die 131 and to be clamped. In other words, when the upper mold 120 moves downward, the first guide portion 133 can abut against the second guide portion 121, and the first sliding lower mold 132 moves in the first direction 11 to approach the fixed lower mold 131 until the mold is closed.

The arrow on the right side in fig. 2 indicates the moving direction of the upper die 120 when the upper die 120 descends.

When the elbow split mold 100 is used, a straight pipe is placed in the mold cavity 101, the upper mold 120 is driven to press downwards, the second guide portion 121 of the upper mold 120 abuts against the first guide portion 133 of the first sliding lower mold 132, the first sliding lower mold 132 is close to the fixed lower mold 131 until the mold is closed under the interaction of the first guide portion 133 and the second guide portion 121, the straight pipe bends and shrinks towards the middle in the process of pressing the upper mold 120 downwards, and the straight pipe deforms to generate bending stress. Go up mould 120 and the fixed straight tube middle part of fixed lower mould 131, can avoid straight tube middle part position to remove, the clearance between first slip lower mould 132 and the fixed lower mould 131 reduces gradually, and the stress of the process release straight tube that first slip lower mould 132 and fixed lower mould 131 are close to each other avoids the straight tube compression in-process because stress concentration leads to the turn the corner pipe uneven thickness and the crack scheduling problem appears, improves the quality of return bend.

In addition, the first guide part 133 and the second guide part 121 cooperate with each other, so that the first sliding lower die 132 can spontaneously approach the fixed lower die 131 during the mold clamping process, and no additional external drive is required. One upper die 120 is correspondingly matched with the first sliding lower die 132 and the fixed lower die 131, so that the manufacturing cost of the device is saved, and the precision can be well controlled.

Fig. 5 is a schematic structural diagram of an upper mold 120 according to an embodiment of the present disclosure, please refer to fig. 2 and fig. 5. In the present embodiment, the first guide portion 133 has a first guide surface 134 (see fig. 7), and the second guide portion 121 has a second guide surface 122, and the first guide surface 134 and the second guide surface 122 can at least partially abut when the upper die 120 descends.

Further, in the present embodiment, the first guide surface 134 and the second guide surface 122 are parallel to each other, and the first guide surface 134 and the second guide surface 122 can abut when the upper die 120 moves downward, further, when the first guide surface 134 and the second guide surface 122 abut and move relatively, in order to allow for a large relative displacement of the upper die 120 with respect to the first lower slide die 132 in the first direction 11, and when the first guide surface 134 abuts against the second guide surface 122, the first lower slide die 132 receives the urging force of the upper die 120 and causes a large component force to occur in the first direction 11, an angle α (see fig. 7) between the first guide surface 134 and the first direction 11 is 30 to 60 °, further α may be 40 to 55 °, for example, 45 °, accordingly, an angle between the first guide surface 134 and the first direction 11 may be 30 to 60 °, further 40 to 55 °, for example, 45 °.

Further, in this embodiment, the first sliding lower die 132 is convexly provided with a wedge block 135, and the first guide surface 134 is located at the wedge block 135 and faces away from the fixed lower die 131; the upper mold 120 is provided with a locking groove 123 matching with the wedge 135, and the second guide surface 122 is located on the bottom wall of the locking groove 123.

When the upper mold 120 moves downward, the wedge block 135 extends into the notch 123, and the first guide surface 134 abuts against the second guide surface 122 and moves relatively to the second guide surface to close the mold.

In other embodiments of the present application, the wedge block 135 may also be disposed on the upper mold 120, and the slot 123 is disposed on the first sliding lower mold 132.

In other embodiments of the present application, the first guide portion 133 and the second guide portion 121 may also adopt other manners.

For example, fig. 6 shows two embodiments of the first guide portion 133 and the second guide portion 121 provided in the embodiments of the present application, please refer to fig. 6. In other embodiments of the present application, the first guide surface 134 and the second guide surface 122 may not be parallel, as long as the first guide surface 134 and the second guide surface 122 can abut against each other and move relatively.

The first guiding portion 133 may be irregular, for example, as shown in the left diagram of fig. 6, the first guiding portion 133 is fan-shaped, the second guiding portion 121 has a groove, the first guiding portion 133 can extend into the groove, and the lower end of the groove slides relative to the first guiding portion 133 until the mold is closed.

Referring to the right view of fig. 6, for example, in some embodiments, the first guiding portion 133 is a protruding block protruding away from the fixed lower mold 131, the second guiding portion 121 has a groove having a bottom wall, and a free end of the first guiding portion 133 can extend into the groove and slide relative to the second guiding portion 121 until the mold is closed.

It is understood that in other embodiments of the present application, the first guide portion 133 and the second guide portion 121 may have other shapes, and during the process of abutting and relatively moving the first guide portion 133 and the second guide portion 121, the contact manner between the first guide portion 133 and the second guide portion 121 may be point contact, line contact, or surface contact.

Fig. 7 shows a schematic structural diagram of a first state of the lower mold assembly 130 according to an embodiment of the present disclosure, and fig. 8 shows a schematic structural diagram of a second state of the lower mold assembly 130 according to an embodiment of the present disclosure.

Referring to fig. 7 and 8, as mentioned above, the fixed lower mold 131 is fixedly connected to the base 110; the first slide lower die 132 is slidably coupled to the base 110. In the present embodiment, the fixing lower die 131 and the base 110 are fixedly connected by bolts, and it is understood that the fixing lower die 131 and the base 110 may be integrally formed.

In order to enable the first sliding lower die 132 to better fit with the fixed lower die 131 and avoid the skew in the sliding process, the bend split mold 100 further includes a limiting member 140, the limiting member 140 is disposed at one side of the first sliding lower die 132, and the limiting member 140 has a supporting surface (not shown) extending along the first direction 11 and supporting against the first sliding lower die 132; the limiting member 140 is fixedly connected to the base 110 or the upper mold 120.

In other words, the limiting member 140 may be fixedly connected to the base 110, or may be fixedly connected to the upper die 120, the first sliding lower die 132 may slide relative to the limiting member 140, and during the sliding process, the abutting surface of the limiting member 140 abuts against the first sliding lower die 132 to limit the first sliding lower die 132 from moving along the direction perpendicular to the first direction 11.

In the present embodiment, the limiting member 140 is fixedly connected to the base 110. The limiting member 140 is provided with a sliding groove extending along the first direction 11, the first sliding lower die 132 is convexly provided with a convex rib matched with the sliding groove, and the first sliding lower die 132 and the limiting member 140 are abutted to each other through matching of the convex rib and the sliding groove.

In other embodiments of the present application, the limiting member 140 may be disposed in the middle of the base 110, the limiting member 140 includes a slide rail extending along the first direction 11, and the bottom of the first sliding lower die 132 is slidably connected to the limiting member 140 to achieve the limiting function.

For example, in other embodiments, the base 110 is convexly provided with at least one sliding rail, the sliding rail extends along the first direction 11, the lower end (the end away from the parting surface) of the first sliding lower die 132 is provided with a number of grooves matched with the sliding rail, and the sliding rail and the grooves are matched to realize the relative sliding between the first sliding lower die 132 and the base 110 and limit the sliding of the first sliding lower die 132 along the first direction 11. The number of the sliding rails and the grooves can be one, two, three, four or even more.

In other embodiments of the present application, the position-limiting member 140 may also be configured in other structures.

Fig. 9 shows a schematic structural view of the first sliding lower die 132 according to an embodiment of the present application.

As mentioned above, in the present embodiment, the first sliding lower die 132 is convexly provided with the wedge block 135, and in the present embodiment, in order to achieve a better guiding effect, the first sliding lower die 132 is provided with two wedge blocks 135, and the two wedge blocks 135 are disposed on two sides of the first sliding lower die 132 along a direction perpendicular to the first direction 11.

Further, in other embodiments of the present application, a wedge 135 and a slot 123 may be disposed on the upper mold 120. Accordingly, a locking groove 123 and a wedge 135 are formed in the first lower slide mold 132.

In the present embodiment, the wedge 135 is located in the middle of the first sliding lower die 132, and in other embodiments of the present application, the wedge 135 may be located at the end of the first sliding lower die 132 or at another position, such as a point a, B, C, or D in fig. 8.

Accordingly, two wedge blocks 135 may be arbitrarily selected from points a, B, C, or D, and it is understood that only one wedge block 135 may be provided in the first slide lower die 132.

In other embodiments, the first guide 133 is not the wedge block 135, and the first guide 133 may be located in other shapes or other structures. Accordingly, the position of the second guide part 121 correspondingly matches the first guide part 133.

Further, in the present embodiment, the lower die assembly 130 further includes a second sliding lower die 150, and the second sliding lower die 150 is disposed on a side of the fixed lower die 131 away from the first sliding lower die 132; the second slide lower die 150 is provided with a third guide portion 151.

The upper mold 120 is provided with a fourth guide portion 124 (see fig. 4) that matches the third guide portion 151, and when the upper mold 120 descends, the third guide portion 151 can abut against the fourth guide portion 124 and move relatively to bring the second slide lower mold 150 close to the fixed lower mold 131 and mold it.

In the present embodiment, the position, structure, number, and connection relationship with the second sliding lower die 150 of the third guide part 151 are the same as the first guide part 133. The position, structure, and number of the fourth guide portions 124 are the same as those of the second guide portions 121. And will not be described in detail herein. In other embodiments, the second slide lower die 150 and the first slide lower die 132 may have different structures. For example, the third guide parts 151 may be different in position, structure, number, etc. from the first guide parts 133.

The second sliding lower die 150 and the first sliding lower die 132 are respectively disposed on two opposite sides of the fixed lower die 131 along the first direction 11. Accordingly, the lengths of the second slide lower die 150 and the first slide lower die 132 in the first direction 11 may be the same or different.

When the bend pipe split mold 100 is used, the straight pipe bends and contracts toward the middle when the upper mold 120 is pressed down, and the straight pipe deforms to generate stress. The upper die 120 and the fixed lower die 131 fix the middle part of the straight pipe, and the gap between the first sliding lower die 132 and the fixed lower die 131 is gradually reduced to release the stress of the straight pipe; the gap between the second sliding lower die 150 and the fixed lower die 131 is gradually reduced to release the stress of the straight pipe.

When the pipe length is longer, the lower die assembly 130 has at least two stress release gaps, so that the problem of uneven thickness caused by inconsistent shrinkage of each point due to stress concentration can be well avoided, and the quality of the bent pipe is improved.

Further, in the present embodiment, the second sliding lower die 150 is also provided with a limiting member 140, and the position, structure and connection relationship between the limiting member 140 and the second sliding lower die 150 refer to the limiting member 140 of the first sliding lower die 132, which is not described herein again.

Further, in some embodiments of the present application, the lower die assembly 130 further includes a third slide lower die (not shown in the figures).

The third sliding lower die is slidably connected with the base 110, and the third sliding lower die is arranged on one side of the first sliding lower die 132 away from the fixed lower die 131; the third sliding lower die is provided with a fifth guide portion.

The upper die 120 is provided with a sixth guide portion matching the fifth guide portion, and when the upper die 120 descends, the sixth guide portion can abut against the fifth guide portion and move relatively so that the third sliding lower die can approach the fixed lower die 131 and be clamped.

In other words, in some embodiments, the lower die assembly 130 may include two sliding lower dies (a first sliding lower die 132 and a third sliding lower die), and the first sliding lower die 132 and the third sliding lower die are disposed on the same side of the fixed lower die 131 and arranged in the first direction 11.

Further, the fifth guide portion and the sixth guide portion are arranged in the same way as the first guide portion 133 and the second guide portion 121, and accordingly, the limiting member 140 is also disposed on the third sliding lower die, and the limiting member 140 is the same as the limiting member 140 of the first sliding lower die 132, and will not be described again here.

When the bend pipe split mold 100 is used, the straight pipe bends and contracts toward the middle when the upper mold 120 is pressed down, and the straight pipe deforms to generate stress. The upper die 120 and the fixed lower die 131 fix the middle part of the straight pipe, and the gap between the first sliding lower die 132 and the fixed lower die 131 is gradually reduced to release the stress of the straight pipe; the gap between the third sliding lower die and the fixed lower die 131 is gradually reduced to release the stress of the straight pipe.

When the pipe length is longer, the lower die assembly 130 has at least two stress release positions, so that the problem of uneven thickness caused by inconsistent contraction of each point due to stress concentration can be well avoided, and the quality of the bent pipe is improved.

In other words, in the present application, the lower die assembly 130 may include one sliding lower die or may include two sliding lower dies. In the embodiment including two sliding lower molds, the two sliding lower molds may be respectively located at both sides of the fixed lower mold 131 in the first direction 11, or may be both located at one side of the fixed lower mold 131.

Further, in other embodiments of the present application, the lower die assembly 130 may include 3, 4, 5, or 10, etc. more sliding lower dies. The plurality of sliding lower molds are slidably coupled to the base 110. The plurality of sliding lower molds may be uniformly or non-uniformly disposed at both sides of the fixed lower mold 131.

Fig. 10 shows a schematic structural view of the fixed lower die 131 and the first sliding lower die 132 according to an embodiment of the present application.

Referring to fig. 10 and 4, in the present embodiment, after the fixed lower die 131 and the first sliding lower die 132 are close to each other and are closed, the facing surfaces of the fixed lower die 131 and the first sliding lower die 132 correspond to the valley positions of the cavity 101. Such as the position shown by line i in fig. 10.

The facing surfaces of the fixed lower die 131 and the first sliding lower die 132 refer to the surfaces of the fixed lower die 131 close to the first sliding lower die 132 and the surfaces of the first sliding lower die 132 close to the fixed lower die 131.

In other embodiments of the present application, the facing surfaces of the fixed lower die 131 and the first sliding lower die 132 may correspond to the peaks of the cavity 101, for example, the position shown by the dashed line ii in fig. 10.

The straight pipe is contracted after being compressed, and the bending stress of the straight pipe is larger at the positions corresponding to the wave crests and the wave troughs of the bent pipe. Therefore, the gap between the fixed lower die 131 and the first sliding lower die 132 is set at a position corresponding to the peak or the valley of the cavity 101, which facilitates the release of the stress, so as to reduce the influence of poor quality caused by the difference of the stress.

Alternatively, in other embodiments of the present application, the facing surfaces of the fixed lower die 131 and the first sliding lower die 132 may correspond to the positions of the mold cavity 101 between the peaks or the valleys, such as the positions shown by the dashed lines iii and iv in fig. 10.

Correspondingly, the facing surfaces of the second sliding lower die 150 and the fixed lower die 131 may also correspond to the positions of the wave crests of the mold cavity 101; alternatively, the facing surfaces of the second sliding lower die 150 and the fixed lower die 131 may correspond to the positions of the valleys of the cavity 101; alternatively, the facing surfaces of the second sliding lower die 150 and the fixed lower die 131 may correspond to the positions of the cavities 101 between the peaks or the valleys.

The main principle of the bend split mold 100 provided by the embodiment of the application is as follows:

the upper die 120 is pressed down, and the second guide portion 121 of the upper die 120 abuts against the first guide portion 133 of the first slide lower die 132; the fourth guide portion 124 of the upper die 120 abuts the third guide portion 151 of the second slide lower die 150. The upper die 120 is further pressed down, the second guide portion 121 and the first guide portion 133 abut against each other and move to each other, so that the first sliding lower die 132 moves in the first direction 11 to be close to the fixed lower die 131 by the upper die 120; the fourth guide portion 124 and the third guide portion 151 abut against each other and move to move the second sliding lower die 150 in the first direction 11 by the upper die 120 to approach the fixed lower die 131 until the die is closed, and in this process, the stopper 140 restrains the first sliding lower die 132 and the second sliding lower die 150, so that the first sliding lower die 132 and the second sliding lower die 150 can be prevented from being inclined.

The split elbow die 100 provided by the embodiment of the application has at least the following advantages:

the pipe bending split mold 100 includes a first sliding lower mold 132 and a fixed lower mold 131, and when the straight pipe is pressed by the upper mold 120, the first sliding lower mold 132 and the fixed lower mold 131 approach each other, and in the process of this approach, the bending stress of the straight pipe is released. Accordingly, the second sliding lower die 150 and the fixed lower die 131 approach each other, and in the process of this approach, the bending stress of the straight pipe is released. Stress concentration is eliminated, the problem of uneven thickness of the bent pipe is solved, and the quality of the bent pipe is improved.

The first sliding lower die 132 and the fixed lower die 131 approach each other by the second guide portion 121 and the first guide portion 133 abutting against each other and moving each other, and in this process, no driving force is required other than the downward movement of the upper die 120. Accordingly, the second sliding lower die 150 and the fixed lower die 131 approach each other by the fourth guide portion 124 and the third guide portion 151 abutting each other and moving each other, in which process, no driving force is required other than the downward movement of the driving upper die 120.

In the process of pressing a straight pipe, the upper die 120 drives the first sliding lower die 132 and the second sliding lower die 150 to be close to the fixed lower die 131 to realize die assembly, so that the die assembly precision is high, and the equipment manufacturing cost is low.

The method for manufacturing the bent pipe by adopting the bent pipe split mold 100 mainly comprises the following steps:

a preset distance is formed between the fixed lower die 131 and the first sliding lower die 132; further, the preset distance is set to: the upper die 120 is pressed down to a length range in which the first slide lower die 132 can be brought close to the fixed lower die 131 and clamped.

Placing the straight tube in the mold cavity 101;

driving the upper die 120 to move downwards to enable the first sliding lower die 132 to approach the fixed lower die 131, and closing the dies; then opening the mold and taking out the bent pipe.

Further, in the present embodiment, in the process of driving the upper mold 120 to move downward, an internal high pressure device is used to introduce high pressure fluid into the straight pipe, and after mold closing, the pressure is maintained for a period of time, and then the bent pipe is taken out.

The main advantages of the bend split mold 100 provided by the embodiment of the present application are:

the bending stress in the straight pipe bending process can be effectively released by adopting the bending pipe split mold 100 to manufacture the bending pipe, the problem of uneven thickness of the bending pipe caused by large stress difference at each position is solved to a great extent, and the quality of the bending pipe is improved.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. The split die for the bent pipe is characterized in that a parting surface of the split die for the bent pipe is a curved surface, the split die for the bent pipe is provided with a die cavity extending along a first direction, and the split die for the bent pipe comprises a base body, an upper die and a lower die assembly;

the lower die assembly comprises a fixed lower die and a first sliding lower die, and the fixed lower die is fixedly connected with the base body; the first sliding lower die is connected with the base body in a sliding mode and can move along the first direction to be close to or far away from the fixed lower die; the first sliding lower die is provided with a first guide part;

2. An elbow split mold according to claim 1, wherein the first guide portion has a first guide surface and the second guide portion has a second guide surface, the first guide surface and the second guide surface being at least partially conformable when the upper mold is lowered.

3. The pipe bending split mold according to claim 2, wherein the first sliding lower mold is convexly provided with a wedge block, and the first guide surface is located at the wedge block and faces away from the fixed lower mold; the upper die is provided with a clamping groove matched with the wedge-shaped block, and the second guide surface is located on the side wall of the clamping groove and faces the fixed lower die.

4. The pipe bending split mold according to claim 2, wherein the upper mold is convexly provided with a wedge-shaped block, and the second guide surface is located at the wedge-shaped block and faces the fixed lower mold; first slip lower mould be provided with the draw-in groove that the wedge matches, first guide face is located the lateral wall of draw-in groove and dorsad fixed lower mould.

5. The split elbow mold according to claim 1, wherein after the mold closing, the opposing surfaces of the fixed lower mold and the first sliding lower mold correspond to the positions of the peaks or the valleys of the mold cavity.

6. The pipe-bending split mold according to claim 1, further comprising a stopper provided at one side or both sides of the first sliding lower mold, the stopper having an abutting surface extending in the first direction and abutting against the first sliding lower mold; the limiting piece is fixedly connected with the base body or the upper die.

7. The elbow split mold of claim 1, wherein the lower mold assembly further comprises a second sliding lower mold;

and the upper die is provided with a fourth guide part matched with the third guide part, and when the upper die descends, the third guide part can be abutted against the fourth guide part and relatively moves to enable the second sliding lower die to be close to the fixed lower die and to be matched with the fixed lower die.

8. The elbow split mold of claim 1, wherein the lower mold assembly further comprises a third sliding lower mold;

and the upper die is provided with a sixth guide part matched with the fifth guide part, and when the upper die descends, the sixth guide part can be abutted against the fifth guide part and relatively moves so that the third sliding lower die can be close to the fixed lower die and is matched with the fixed lower die.

9. The split elbow mold according to claim 1, wherein the split elbow mold is provided with a plurality of the mold cavities arranged side by side.

10. The elbow split mold of claim 9, wherein the mold cavity comprises a first straight section, a bent section, and a second straight section connected in series.