CN110434237B - Elbow split die and elbow manufacturing method - Google Patents

Elbow split die and elbow manufacturing method Download PDF

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Publication number
CN110434237B
CN110434237B CN201910826938.1A CN201910826938A CN110434237B CN 110434237 B CN110434237 B CN 110434237B CN 201910826938 A CN201910826938 A CN 201910826938A CN 110434237 B CN110434237 B CN 110434237B
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China
Prior art keywords
lower die
die
sliding
mold
guide part
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CN201910826938.1A
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CN110434237A (en
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王朝永
王小龙
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Henan Yongfude Science & Technology Co ltd
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Henan Yongfude Science & Technology Co ltd
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Priority to CN201910826938.1A priority Critical patent/CN110434237B/en
Publication of CN110434237A publication Critical patent/CN110434237A/en
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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
    • 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
    • B21D7/00—Bending rods, profiles, or tubes
    • B21D7/06—Bending rods, profiles, or tubes in press brakes or between rams and anvils or abutments; Pliers with forming dies

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Abstract

The application relates to the field of pipe bending, in particular to a pipe bending split die and a pipe bending manufacturing method. The parting surface of the elbow split mold is a curved surface, the elbow split mold is provided with a mold cavity extending along a first direction, and the elbow split mold comprises a substrate, an upper mold and a lower mold assembly; 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 descends, the first guide part can be propped against the second guide part and relatively move so as to enable the first sliding lower die to be close to the fixed lower die and be clamped. When the upper die is used for manufacturing the straight pipe, the first sliding lower die and the fixed lower die are close to each other, and bending stress of the straight pipe is released in the process of the mutual approaching. The 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

Elbow split die and elbow manufacturing method
Technical Field
The application relates to the field of pipe bending, in particular to a pipe bending split die and a pipe bending manufacturing method.
Background
In the prior art, most of bent pipes are formed by pressing straight pipes, but in the pressing process, the stress at different positions along the length direction of a pipe body is different, and the problems that the pressing is not easy to control, the wall thickness difference at different positions along the length direction of the final bent pipe is large and the like exist.
Disclosure of Invention
The embodiment of the application aims to provide a pipe bending split die and a pipe bending manufacturing method, which aim to solve the problem that the quality of a pipe bending pressed by the existing pipe bending die is poor.
The first aspect of the application provides a return bend split mold, return bend split mold's die joint is the curved surface, and return bend split mold is provided with along the die cavity of first direction extension, and return bend split mold includes base member, goes up mould and lower mould subassembly.
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 in sliding connection with the base body, and can move along a first direction to approach or depart 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 descends, the first guide part can be propped against the second guide part and relatively move so as to enable the first sliding lower die to be close to the fixed lower die and be clamped.
In the process of driving the upper die to press down, the straight pipe is bent and contracted towards the middle, and bending stress is generated by deformation of the straight pipe. The upper die and the fixed lower die fix the middle part of the straight pipe, so that the middle part of the straight pipe can be prevented from moving, the gap between the first sliding lower die and the fixed lower die is gradually reduced, the first sliding lower die and the fixed lower die are mutually close to release the bending stress of the straight pipe, the problems of uneven thickness of the bent pipe, cracks and the like caused by stress concentration in the compression process of the straight pipe are avoided, and the quality of the bent pipe is improved. The first guide part is matched with the second guide part, so that the first sliding lower die can automatically approach to the fixed lower die in the die assembly process, and no additional external driving is needed. The precision can be controlled well 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 being capable of at least partially conforming to the second guide surface when the upper die is lowered.
By at least partial fitting of the first guide surface and the second guide surface, the first guide portion can be abutted against the second guide portion and can move relatively stably.
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 positioned on the side wall of the clamping groove and faces the fixed lower die.
Or the upper die is convexly provided with a wedge block, and the second guide surface is positioned on the wedge 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 positioned on the side wall of the clamping groove and is opposite to the fixed lower die.
Through the cooperation of wedge and draw-in groove, realize that first guide portion can support with second guide portion and remove relatively steadily. The wedge block has better positioning effect, and in the process that the upper die contacts the first sliding lower die, the wedge block can extend into the clamping groove more accurately.
In some embodiments of the first aspect of the present application, after clamping, the facing surfaces of the fixed lower die and the first sliding lower die correspond to the peak or trough positions of the die cavity.
The straight pipe is contracted after being compressed, and bending stress of the straight pipe is larger at the position corresponding to the wave crest and the wave trough of the bent pipe. Therefore, the gaps of 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 stress release 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 elbow split mold further includes a limiting member disposed on one side or both sides of the first sliding lower mold, the limiting member having an abutting surface extending along 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.
The supporting surface of the limiting piece supports against the first sliding lower die to limit the first sliding lower die to move along the direction perpendicular to the first direction.
In some embodiments of the first aspect of the present application, the lower die assembly further comprises a second sliding lower die.
The second sliding lower die is in sliding connection with the substrate, and is arranged on one side of the fixed lower die, which is far away from the first sliding 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 descends, the third guide part can be propped against the fourth guide part and relatively move so as to enable the second sliding lower die to be close to the fixed lower die and be clamped.
When the bent pipe split die is used, the straight pipe is bent and contracted towards the middle when the upper die is pressed down, and the straight pipe deforms to generate stress. The upper die and the fixed lower die fix the middle part of the straight pipe, the gap between the first sliding lower die and the fixed lower die is gradually reduced, and the stress of the straight pipe is released; the gap between the second sliding lower die 5 and the fixed lower die gradually decreases, and the stress of the straight pipe is released. When the pipe length is longer, lower die assembly has two at least stress relief clearance, can avoid stress concentration to lead to each point shrink inconsistent and lead to the uneven problem of thickness well, improves the quality of return bend.
In some embodiments of the first aspect of the present application, the lower die assembly further comprises a third sliding lower die.
The third sliding lower die is in sliding connection with the base body, and is arranged at one side of the first sliding lower die far away from the fixed lower die; the third sliding lower die is provided with a fifth guide part;
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 propped against the fifth guide part and relatively move so that the third sliding lower die can be close to the fixed lower die and clamped.
When the bent pipe split die is used, the straight pipe is bent and contracted towards the middle when the upper die is pressed down, and the straight pipe deforms to generate stress. The upper die and the fixed lower die fix the middle part of the straight pipe, the gap between the first sliding lower die and the fixed lower die is gradually reduced, and the stress of the straight pipe is released; and the gap 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 disposed side-by-side.
The elbow split mold is provided with a plurality of mold cavities, and can be used for pressing a plurality of multi-conjoined elbow molding blanks, namely a plurality of multi-elbows at one time.
In some embodiments of the first aspect of the present application, the mold cavity comprises a first straight tube section, a curved tube section, and a second straight tube section connected in sequence.
A second aspect of the present application provides a method for manufacturing an elbow, the method for manufacturing an elbow using the elbow split mold provided in the first aspect, the method for manufacturing an elbow comprising:
the fixed lower die and the first sliding lower die are provided with a preset distance.
The straight tube is placed in the mold cavity.
Driving the upper die to downwards move the first sliding lower die to be close to the fixed lower die, and closing the dies; and then opening the die to take out the bent pipe.
The bending stress in the bending process of the straight pipe can be effectively released by adopting the bending split die to manufacture the bent pipe, the problem of uneven thickness of the bent pipe caused by large stress differences at all positions is solved to a great extent, and the quality of the bent pipe is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a first state of an elbow split mold according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a second state of the elbow split mold according to the embodiment of the present application;
fig. 3 is a schematic structural view of another view angle of the second state of the elbow split mold according to the embodiment of the present application;
FIG. 4 illustrates a schematic cross-sectional view of several mold cavities provided in an embodiment of the present application;
fig. 5 shows a schematic structural diagram of an upper die according to an embodiment of the present application;
FIG. 6 illustrates two implementations of a first guide and a second guide provided in embodiments of the present application;
fig. 7 is a schematic structural view showing a first state of the lower die set according to the embodiment of the present application;
FIG. 8 is a schematic view showing a second state of the lower die assembly according to the embodiment of the present application;
fig. 9 shows a schematic structural view of a first sliding lower die according to 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 pipe split mold; 11-a first direction; 101-a mold cavity; 102-a first straight pipe section; 103-bending a pipe section; 104-a second straight pipe section; 110-matrix; 120-upper die; 121-a second guide; 122-a second guide surface; 123-clamping grooves; 124-fourth guides; 130-a lower die assembly; 131-fixing the lower die; 132-a first sliding lower die; 133-a first guide; 134-a first guide surface; 135-wedge blocks; 140-limiting pieces; 150-a second sliding lower die; 151-third guide.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of 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 apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the embodiments of the present application, it should be understood that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, or the azimuth or positional relationship commonly put in use of the product of the application, or the azimuth or positional relationship commonly understood by one skilled in the art, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present application.
Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not 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 explicitly specified and limited otherwise, the terms "disposed," "mounted," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
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 an embodiment of the present application, fig. 3 shows a schematic structural diagram of another view angle of the second state of the elbow split mold 100 provided in an embodiment of the present application, and referring to fig. 1 to fig. 3, the embodiment provides an elbow split mold 100 mainly used for pressing a straight pipe into an elbow. Elbows may be used to make elbows.
The parting surface of the elbow split mold 100 is a curved surface, the curved surface refers to a surface different from a plane, the shape of the curved surface can be set according to the shape of the target elbow, and the specific shape of the curved surface is not limited in the application.
In this embodiment, the parting surface is in a smoothly transitional wavy shape, and the parting surface includes a first plane, a smoothly transitional curved surface and a second plane which are sequentially continuous 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 intervals. 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 than a number of mold cavities 101. The cavities 101 are arranged in parallel. The elbow split mold 100 is provided with a plurality of mold cavities 101, and can be used for pressing a plurality of multi-connected elbow molding blanks, namely a plurality of multi-elbows at one time. The term "plurality" as used herein refers to two or more.
Fig. 4 shows a schematic cross-sectional view of several mold cavities 101 provided in an embodiment of the present application, and from top to bottom, three cross-sectional views l, m, n of the mold cavity 101 are shown, wherein the top l shows the cross-sectional shape of the mold cavity 101 of the embodiment shown in fig. 2.
In this embodiment, the die cavity 101 includes a first straight tube segment 102, a bend tube segment 103, and a second straight tube segment 104 that are connected in sequence. The first straight tube section 102 and the second straight tube section 104 refer to tube lumens extending in the first direction 11, the bent tube section 103 is substantially wavy, and the uppermost section l of fig. 4 shows the bent tube section 103 having four peaks and four valleys. Further, the bend section 103 may have one, two, three or more bend point lumens. In other words, the undulating bend segment 103 may have at least one peak, or have at least one trough. 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 that are connected in sequence. Alternatively, the mold cavity 101 includes a straight section, a curved section, and a straight section connected in sequence. Accordingly, in the present application, the lengths of the curved section and the straight section are 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 for supporting the lower die assembly 130, and the upper die 120 and the lower die assembly 130 are assembled to form the die cavity 101.
The lower die assembly 130 includes a fixed lower die 131 and a first sliding lower die 132, the fixed lower die 131 being fixedly connected with the base 110; the first sliding lower die 132 is slidably connected to the base 110, and the first sliding lower die 132 can move in the first direction 11 to approach or separate from the fixed lower die 131; the first sliding lower die 132 is provided with a first guide 133.
The upper die 120 is provided with a second guide portion 121 that mates with the first guide portion 133, and when the upper die 120 is lowered, the first guide portion 133 can abut against and relatively move with the second guide portion 121 to bring the first sliding lower die 132 close to the fixed lower die 131 and clamp the same. In other words, when the upper die 120 is lowered, the first guide portion 133 can abut against the second guide portion 121, so that the first sliding lower die 132 is moved in the first direction 11 to approach the fixed lower die 131 until the die is closed.
The arrow on the right side in fig. 2 refers to the movement direction of the upper die 120 when the upper die 120 descends.
When the bent pipe split mold 100 is used, a straight pipe is placed in the mold cavity 101, the upper mold 120 is driven to press down, the second guide part 121 of the upper mold 120 abuts against the first guide part 133 of the first sliding lower mold 132, the first sliding lower mold 132 approaches the fixed lower mold 131 until the mold is closed under the interaction of the first guide part 133 and the second guide part 121, and in the process of pressing down the upper mold 120, the straight pipe is bent and contracted towards the middle, and bending stress is generated by deformation of the straight pipe. The upper die 120 and the fixed lower die 131 fix the middle part of the straight pipe, so that the middle part of the straight pipe can be prevented from moving, the gap between the first sliding lower die 132 and the fixed lower die 131 is gradually reduced, the stress of the straight pipe is released in the process that the first sliding lower die 132 and the fixed lower die 131 are close to each other, the problems of uneven thickness of the bent pipe, cracks and the like caused by stress concentration in the compression process of the straight pipe are avoided, and the quality of the bent pipe is improved.
In addition, by the cooperation of the first guide portion 133 and the second guide portion 121, the first sliding lower die 132 can spontaneously approach the fixed lower die 131 during the die clamping process, and no additional external driving 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 precision can be well controlled while the manufacturing cost of equipment is saved.
Fig. 5 is a schematic structural diagram of an upper die 120 according to an embodiment of the present application, please refer to fig. 2 and 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 be at least partially fitted when the upper die 120 is lowered.
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 be fitted when the upper die 120 is lowered. Further, when the first guide surface 134 is in contact with the second guide surface 122 and moves relatively, the first slide lower die 132 receives the force of the upper die 120 and has a large component force in the first direction 11 in order to accommodate a large relative displacement of the upper die 120 in the first direction 11, while the first guide surface 134 is in contact with the second guide surface 122. The angle α (see fig. 7) between the first guiding surface 134 and the first direction 11 is 30-60 °, further α may be 40-55 °, for example 45 °. Correspondingly, the angle between the first guiding surface 134 and the first direction 11 may also be 30-60 °, further 40-55 °, for example 45 °. It will be appreciated that in other embodiments, the angle between the second guiding surface 122 and the first direction 11 may be 70 °,25 °, etc.
Further, in the present embodiment, the first sliding lower die 132 is convexly provided with a wedge block 135, and the first guiding surface 134 is located on the wedge block 135 and faces away from the fixed lower die 131; the upper die 120 is provided with a clamping groove 123 matched with the wedge block 135, and the second guide surface 122 is positioned at the bottom wall of the clamping groove 123.
When the upper die 120 descends, the wedge block 135 extends into the clamping groove 123, and the first guide surface 134 abuts against the second guide surface 122, moves relatively, and closes the die.
In other embodiments of the present application, the wedge block 135 may be disposed on the upper die 120, and the clamping groove 123 is disposed on the first sliding lower die 132.
In other embodiments of the present application, the first guide portion 133 and the second guide portion 121 may also take other forms.
For example, fig. 6 shows two implementations of the first guide portion 133 and the second guide portion 121 provided in the embodiment 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 and move relatively.
The first guiding portion 133 may be irregularly shaped, referring to the left schematic view in fig. 6, for example, the first guiding portion 133 is in a fan shape, 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 die is closed.
Referring to the right side of fig. 6, for example, in some embodiments, the first guide portion 133 is a protruding block protruding away from the fixed lower die 131, the second guide portion 121 has a groove with a bottom wall, and the free end of the first guide portion 133 can extend into the groove and slide relative to the second guide portion 121 until the die is closed.
It is understood that, in other embodiments of the present application, the first guiding portion 133 and the second guiding portion 121 may have other shapes, and the contact manner between the first guiding portion 133 and the second guiding portion 121 may be point contact, line contact or surface contact during the process of abutting and relatively moving the first guiding portion 133 and the second guiding portion 121.
Fig. 7 is a schematic structural diagram of a first state of the lower die assembly 130 according to an embodiment of the present application, and fig. 8 is a schematic structural diagram of a second state of the lower die assembly 130 according to an embodiment of the present application.
Referring to fig. 7 and 8, as described above, the fixed lower die 131 is fixedly connected to the base 110; the first sliding lower die 132 is slidably coupled to the base 110. In the present embodiment, the fixed lower die 131 is fixedly connected to the base 110 by bolts, and it is understood that the fixed lower die 131 and the base 110 may be integrally formed.
In this embodiment, in order to make the first sliding lower die 132 better match with the fixed lower die 131, and avoid the skew during the sliding process, the elbow split mold 100 further includes a limiting element 140, where the limiting element 140 is disposed on one side of the first sliding lower die 132, and the limiting element 140 has a supporting surface (not labeled in the figure) extending along the first direction 11 and supporting against the first sliding lower die 132; the limiting member 140 is fixedly connected with the base 110 or the upper die 120.
In other words, the limiting member 140 may be fixedly connected to the base 110 or the upper die 120, and the first sliding lower die 132 may slide relative to the limiting member 140, and in 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 to move along the direction perpendicular to the first direction 11.
In this embodiment, the limiting member 140 is fixedly connected to the base 110. The limiting piece 140 is provided with a chute extending along the first direction 11, the first sliding lower die 132 is convexly provided with a convex rib matched with the chute, and mutual supporting between the first sliding lower die 132 and the limiting piece 140 is realized through matching of the convex rib and the chute.
In other embodiments of the present application, the limiting member 140 may be disposed in the middle of the base 110, where the limiting member 140 includes a sliding rail extending along the first direction 11, and the bottom of the first sliding lower die 132 is slidably connected with the limiting member 140 to achieve a limiting effect.
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 far away from the parting surface) of the first sliding lower die 132 is provided with a number of grooves matching with the sliding rail, the sliding rail matches with the grooves to realize the relative sliding of the first sliding lower die 132 and the base 110, and the first sliding lower die 132 is restricted from sliding along the first direction 11. The number of slide rails and grooves may be one, two, three, four or even more.
In other embodiments of the present application, the limiting member 140 may be provided in other structures.
Fig. 9 shows a schematic structural diagram of a first sliding lower die 132 provided in an embodiment of the present application.
As described above, in the present embodiment, the first sliding lower die 132 is convexly provided with the wedge blocks 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 both sides of the first sliding lower die 132 in the direction perpendicular to the first direction 11.
Further, in other embodiments of the present application, a wedge 135 and a slot 123 may be provided in the upper die 120. Correspondingly, a clamping groove 123 and a wedge block 135 are arranged on the first sliding lower die 132.
In the present embodiment, the position of the wedge block 135 is located in the middle of the first sliding lower die 132, and in other embodiments of the present application, the position of the wedge block 135 may be located at an end of the first sliding lower die 132 or other positions, such as point a, point B, point C or point D in fig. 8.
Accordingly, two wedge blocks 135 may be arbitrarily selected from the point a, the point B, the point C or the point D, and it is understood that only one wedge block 135 may be provided in the first sliding lower die 132.
In other embodiments, the first guide 133 is not a wedge 135, and the position of the first guide 133 is the same when it is of other shape or other structure. Accordingly, the position of the second guide 121 is correspondingly matched with the first guide 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 at a side of the fixed lower die 131 away from the first sliding lower die 132; the second sliding lower die 150 is provided with a third guide 151.
The upper die 120 is provided with a fourth guide portion 124 (see fig. 4) mated with the third guide portion 151, and when the upper die 120 is lowered, the third guide portion 151 can abut against and relatively move with the fourth guide portion 124 to bring the second sliding lower die 150 close to the fixed lower die 131 and clamp it.
In the present embodiment, the positions, structures, the number, and the connection relationship with the second slide lower die 150 of the third guide portions 151 are the same as those of the first guide portions 133. The fourth guide portions 124 are identical in position, structure, and number to the second guide portions 121. And will not be described in detail here. In other embodiments, the second sliding lower die 150 and the first sliding lower die 132 may also be different in structure. For example, the position, structure, number, etc. of the third guide portions 151 may be different from those of the first guide portions 133.
The second sliding lower mold 150 and the first sliding lower mold 132 are respectively disposed at two opposite sides of the fixed lower mold 131 along the first direction 11. Accordingly, the lengths of the second sliding lower die 150 and the first sliding lower die 132 in the first direction 11 may be the same or different.
When the bend 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, the gap between the first sliding lower die 132 and the fixed lower die 131 is gradually reduced, and the stress of the straight pipe is released; the gap between the second sliding lower die 150 and the fixed lower die 131 gradually decreases, releasing 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 mold 150 is also configured with a limiting member 140, and the position, structure and connection relationship between the limiting member 140 and the second sliding lower mold 150 are shown in the above description about the limiting member 140 of the first sliding lower mold 132, which is not described herein again.
Further, in some embodiments of the present application, the lower die assembly 130 further includes a third sliding lower die (not shown).
The third sliding lower die is in sliding connection with the base 110, and is arranged at 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 that mates with the fifth guide portion, and when the upper die 120 is lowered, the sixth guide portion can abut against and relatively move with the fifth guide portion to enable the third sliding lower die to 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), the first sliding lower die 132 and the third sliding lower die being disposed on the same side of the fixed lower die 131, and being arranged along the first direction 11.
Further, the arrangement of the fifth guide portion and the sixth guide portion is the same as the arrangement of the first guide portion 133 and the second guide portion 121, and accordingly, the third sliding lower die is also provided with a stopper 140, and the stopper 140 is the same as the stopper 140 of the first sliding lower die 132, and will not be repeated here.
When the bend 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, the gap between the first sliding lower die 132 and the fixed lower die 131 is gradually reduced, and the stress of the straight pipe is released; the gap between the third sliding lower die and the fixed lower die 131 gradually decreases, releasing the stress of the straight tube.
When the pipe length is long, the lower die assembly 130 is provided with at least two stress release positions, 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.
In other words, in the present application, the lower die assembly 130 may include one sliding lower die or two sliding lower dies. In the embodiment including two sliding lower molds, the two sliding lower molds may be located on both sides of the fixed lower mold 131 in the first direction 11, or may be located on 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, 10, etc. more sliding lower dies. The plurality of sliding lower molds are all slidably connected 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 a fixed lower die 131 and a first sliding lower die 132 provided in the 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 approach each other until they are clamped, the opposite surfaces of the fixed lower die 131 and the first sliding lower die 132 correspond to the trough of the mold cavity 101. Such as the position shown by line i in fig. 10.
The surface of the fixed lower die 131 and the first sliding lower die 132 facing each other means a surface of the fixed lower die 131 adjacent to the first sliding lower die 132, and a surface of the first sliding lower die 132 adjacent to the fixed lower die 131.
In other embodiments of the present application, the surface of the fixed lower die 131 facing the first sliding lower die 132 may correspond to the peak of the cavity 101, for example, the position shown by the broken line ii in fig. 10.
The straight pipe is contracted after being compressed, and bending stress of the straight pipe is larger at the position corresponding to the wave crest and the wave trough of the bent pipe. Therefore, the gaps between the fixed lower die 131 and the first sliding lower die 132 are disposed at the positions corresponding to the peaks or valleys of the die cavity 101, which is beneficial to release stress, so as to reduce the influence of poor quality caused by different stresses.
Alternatively, in other embodiments of the present application, the facing surfaces of the fixed lower mold 131 and the first sliding lower mold 132 may correspond to the positions of the mold cavity 101 between the peaks or the valleys, for example, the positions shown by the dashed lines iii and iv in fig. 10.
Accordingly, the surfaces of the second slide lower die 150 and the fixed lower die 131 facing each other may correspond to the positions of the peaks of the cavity 101; alternatively, the surfaces of the second slide lower die 150 and the fixed lower die 131 facing each other may correspond to the positions of the valleys of the cavity 101; alternatively, the surfaces of the second slide lower die 150 and the fixed lower die 131 facing each other may correspond to the positions of the cavity 101 between the peaks or the valleys.
The main principle of the pipe bending split mold 100 provided in the embodiment of the present 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 124 of the upper die 120 abuts against the third guide 151 of the second slide lower die 150. The upper die 120 continues to be pressed down, and the second guide part 121 and the first guide part 133 are abutted against each other and move mutually, so that the first sliding lower die 132 moves along the first direction 11 under the action of the upper die 120 to approach the fixed lower die 131; the fourth guide portion 124 and the third guide portion 151 abut against each other and move relative to each other, so that the second sliding lower die 150 moves in the first direction 11 under the action of 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, and can prevent the first sliding lower die 132 and the second sliding lower die 150 from tilting.
The elbow split mold 100 provided in the embodiment of the application has at least the following advantages:
the bent pipe split mold 100 includes a first sliding lower mold 132 and a fixed lower mold 131, and when the upper mold 120 presses a straight pipe, the first sliding lower mold 132 and the fixed lower mold 131 approach each other, and in the process of the approaching each other, bending stress of the straight pipe is released. Accordingly, the second sliding lower die 150 and the fixed lower die 131 are brought close to each other, and in the process of this mutual approaching, the bending stress of the straight pipe is released. The 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 mutual approaching of the first sliding lower die 132 and the fixed lower die 131 is achieved by the second guide portion 121 and the first guide portion 133 abutting against each other and moving each other, in which process no driving force is required except for driving the upper die 120 downward. Accordingly, the second sliding lower die 150 and the fixed lower die 131 are brought close to each other by the fourth guide portion 124 and the third guide portion 151 abutting against each other and moving each other, and in this process, no driving force is required other than driving the upper die 120 downward.
In the process of pressing the 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 manufacturing cost of equipment is low.
The application also provides a method for manufacturing the bent pipe, in this embodiment, the method for manufacturing the bent pipe adopts the bent pipe split mold 100, and the method for manufacturing the bent pipe mainly comprises the following steps:
a predetermined distance is provided between the fixed lower die 131 and the first sliding lower die 132; further, the preset distance is set as: the upper die 120 can be pushed down to bring the first slide lower die 132 close to the fixed lower die 131 and clamp the length range.
Placing a straight tube in the mold cavity 101;
driving the upper die 120 to downwards drive the first sliding lower die 132 to be close to the fixed lower die 131, and closing the die; and then opening the die to take out the bent pipe.
Further, in this embodiment, in the process of driving the upper die 120 downward, a high-pressure fluid is introduced into the straight pipe by using an internal high-pressure device, and after the die is closed, the pressure is maintained for a period of time, and then the bent pipe is taken out.
The main advantages of the elbow split mold 100 provided in the embodiment of the present application are:
the bending stress in the bending process of the straight pipe can be effectively released by adopting the bending split mold 100 to manufacture the bent pipe, the problem of uneven thickness of the bent pipe caused by large stress differences at all positions is solved to a great extent, and the quality of the bent pipe is improved.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims (8)

1. The split mould for the bent pipe is characterized in that the parting surface of the split mould for the bent pipe is a curved surface, the split mould for the bent pipe is provided with a mould cavity extending along a first direction, and the split mould for the bent pipe comprises a substrate, an upper mould and a 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 in sliding connection with the base body, and can move along the first direction to be close to or far 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 descends, the first guide part can prop against the second guide part and relatively move so as to enable the first sliding lower die to be close to the fixed lower die and be clamped;
the first guide part is provided with a first guide surface, the second guide part is provided with a second guide surface, and when the upper die is downward, the first guide surface and the second guide surface can be at least partially jointed;
after the die is assembled, the opposite surfaces of the fixed lower die and the first sliding lower die correspond to the wave crest or wave trough positions of the die cavity.
2. The elbow split mold according to claim 1, wherein the first sliding lower mold is convexly provided with a wedge block, and the first guide surface is positioned on 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 positioned on the side wall of the clamping groove and faces the fixed lower die;
or, the upper die is convexly provided with a wedge block, and the second guide surface is positioned on the wedge 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 positioned on the side wall of the clamping groove and is opposite to the fixed lower die.
3. The elbow split mold according to claim 1, further comprising a stopper provided on 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.
4. The elbow split mold of claim 1, wherein the lower mold assembly further comprises a second sliding lower mold;
the second sliding lower die is in sliding connection with the base body, and is arranged on one side of the fixed lower die far away from the first sliding 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 descends, the third guide part can prop against the fourth guide part and relatively move so as to enable the second sliding lower die to be close to the fixed lower die and be clamped.
5. The elbow split mold of claim 1, wherein the lower mold assembly further comprises a third sliding lower mold;
the third sliding lower die is in sliding connection with the base body, and is arranged on one side of the first sliding lower die away from the fixed lower die; the third sliding lower die is provided with a fifth guide part;
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 prop against the fifth guide part and relatively move so that the third sliding lower die can be close to the fixed lower die and be clamped.
6. The elbow split mold according to claim 1, wherein the elbow split mold is provided with a plurality of the mold cavities arranged side by side.
7. The split elbow mold of claim 6, wherein the mold cavity comprises a first straight pipe section, a bent pipe section, and a second straight pipe section connected in sequence.
8. A method for manufacturing an elbow, wherein the method for manufacturing an elbow uses the elbow split mold according to any one of claims 1 to 7, and the method for manufacturing an elbow comprises:
enabling a preset distance to be reserved between the fixed lower die and the first sliding lower die;
placing a straight pipe in the die cavity;
driving the upper die to downwards drive the first sliding lower die to be close to the fixed lower die, and closing the dies; and then opening the die to take out the bent pipe.
CN201910826938.1A 2019-09-02 2019-09-02 Elbow split die and elbow manufacturing method Active CN110434237B (en)

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CN103753118A (en) * 2013-12-09 2014-04-30 北京航星机器制造有限公司 Bending method of large-diameter thin-wall aluminum pipe and die
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CN106862363A (en) * 2017-04-14 2017-06-20 济南大学 Internal high pressure forming die
CN107321850A (en) * 2017-08-17 2017-11-07 偃师华科管件有限责任公司 A kind of large-scale pipeline pipe fitting processes the installation method with straight length split elbow module
CN208450378U (en) * 2018-05-21 2019-02-01 湛江明迪汽车零部件制造有限公司 A kind of bend pipe mould
CN109807279A (en) * 2019-02-28 2019-05-28 广东南海昌和模具有限公司 A kind of double forming die for pier head for automobile fitting bend pipe
CN210450610U (en) * 2019-09-02 2020-05-05 河南永福德科技股份有限公司 Split die for bent pipe

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011177730A (en) * 2010-02-26 2011-09-15 Hitachi Automotive Systems Ltd Molding method and molding device of metal tube using bulging processing
CN202367016U (en) * 2011-12-01 2012-08-08 浙江精艺管件有限公司 Automatic pipe bending device
CN103753118A (en) * 2013-12-09 2014-04-30 北京航星机器制造有限公司 Bending method of large-diameter thin-wall aluminum pipe and die
CN106311836A (en) * 2016-08-31 2017-01-11 北京星航机电装备有限公司 Forming method and device for large-pipe-diameter thin-wall pipeline moving towards complex space
CN106862363A (en) * 2017-04-14 2017-06-20 济南大学 Internal high pressure forming die
CN107321850A (en) * 2017-08-17 2017-11-07 偃师华科管件有限责任公司 A kind of large-scale pipeline pipe fitting processes the installation method with straight length split elbow module
CN208450378U (en) * 2018-05-21 2019-02-01 湛江明迪汽车零部件制造有限公司 A kind of bend pipe mould
CN109807279A (en) * 2019-02-28 2019-05-28 广东南海昌和模具有限公司 A kind of double forming die for pier head for automobile fitting bend pipe
CN210450610U (en) * 2019-09-02 2020-05-05 河南永福德科技股份有限公司 Split die for bent pipe

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