CN115318899A - Bending forming die and bending method for arched pipe fitting - Google Patents

Bending forming die and bending method for arched pipe fitting Download PDF

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Publication number
CN115318899A
CN115318899A CN202211068704.3A CN202211068704A CN115318899A CN 115318899 A CN115318899 A CN 115318899A CN 202211068704 A CN202211068704 A CN 202211068704A CN 115318899 A CN115318899 A CN 115318899A
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China
Prior art keywords
die
bending
cavity
bent
lower die
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CN202211068704.3A
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CN115318899B (en
Inventor
王连东
吴越
杨东峰
杨崇伟
杨阳
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Hubei Shoucheng Industrial Technology Co ltd
Yanshan University
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Hubei Shoucheng Industrial Technology Co ltd
Yanshan University
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Publication of CN115318899A publication Critical patent/CN115318899A/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
    • 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
    • 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
    • B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/003—Positioning devices
    • 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
    • B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/02—Advancing work in relation to the stroke of the die or tool
    • B21D43/04—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work
    • B21D43/10—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by grippers
    • B21D43/105—Manipulators, i.e. mechanical arms carrying a gripper element having several degrees of freedom

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Abstract

The application discloses a bending forming die and a bending method of an arched pipe fitting. The bending forming die is used on a three-way hydraulic press and consists of an upper die, an upper template, a lower die, a lower template, a left side die, a right side die, a left side template, a right side template, a cushion die, a pressing block, a guide plate, an ejector rod and the like; a cushion die and a pressing block are arranged on the inner sides of the left side die and the right side die, and a half I-shaped guide plate is arranged between the front side and the rear side and the lower die plate to prevent the left slide block and the right slide block of the hydraulic press from being bent during working; the middle cavity of the lower die is a semi-cylindrical hole, the left and right side cavities are tilted upwards to form a bent neck, the left and right end cavities are bent downwards, and the cavities of the bent fillets at the inner ends and the outer ends of the left and right bent necks are semi-elliptical. The bending method is divided into three stages: in the first stage and the third stage of pressing the upper die, the left side die and the right side die push the end part of the pipe blank to feed axially, and the arch pipe fitting with large drop is manufactured. The invention has the advantages of small thickness reduction ratio of the outer side wall of the curved fillet, no wrinkle on the inner side, no collapse of the cross section and the like.

Description

Bending forming die and bending method for arched pipe fitting
Technical Field
The invention relates to the technical field of seamless steel pipe plastic forming, in particular to a bending forming die and a bending method for an arched pipe fitting.
Background
The bow-shaped pipe fitting is of a bilateral symmetry structure (see figure 1) and comprises a cross beam, a left side bent neck, a right side bent neck, a left end fist part and a right end fist part. The left side bent neck and the right side bent neck are bent upwards, and the included angles between the left side bent neck and the beam are B respectively 1 Forming a pipe bending fillet I; left end fist portion, right-hand member fist portion downwarping form the crooked fillet II of pipe fitting. The cross sections of the cross beam, the left side bent neck and the right side bent neck are all hollow circles, and the outer diameter d 1 Wall thickness t 1 The outer diameter d of the cross section of the fist part at the left end and the fist part at the right end 2 Smaller than the outer diameter d 1 Wall thickness t 2 Greater than t 1 (ii) a The cross sections of the pipe fitting bending fillet I and the pipe fitting bending fillet II are hollow ellipses, and the radius of the inner side of the pipe fitting bending fillet I is R 1 Outer radius R 2 ，R 1 Smaller than the outer diameter d of the cross beam 1 (ii) a The inner side radius of the pipe bending fillet II is R 3 Outer radius R 4 ，R 3 Smaller than the outer diameter d of the end portion 2 (ii) a The included angles of the left fist part, the right fist part and the beam are B 0 Height difference H 1 ＝(1.2～2.0)d 1 。
The size of the bow-shaped pipe fitting is larger, and the outer diameter d of the cross beam 1 Phi (110-180) mm, wall thickness t 1 The thickness is not less than 12-18 mm, the composite material can be directly used as the front axle of the automobile, and the front axle with a large-drop hollow rectangular section can be prepared by subsequent integral pressing forming, so that the weight of the product is reduced on the premise of ensuring the strength and the rigidity of the front axle of the automobile.
The bow-shaped pipe fitting is manufactured by adopting a traditional winding method or a common stamping and bending method, the bending and forming difficulty is high, the forming quality is difficult to ensure, and the method mainly comprises the following steps:
(1) The shape is more complicated, and the inside of left side muffler, the right side muffler, outer end have the less crooked fillet I of pipe fitting of inboard radius, the crooked fillet II of pipe fitting respectively, and the inboard fold that produces easily during the shaping.
(2) The internal diameter of left end fist portion, right-hand member fist portion is less than the internal diameter of left side curved neck, right side curved neck, and the dabber can't be effectively used, and outside attenuate rate is big when the crooked fillet I of pipe fitting, the crooked fillet II of pipe fitting take shape, and the cross section produces the defect of collapsing easily.
(3) The height difference between the fist part at the left end and the fist part at the right end and the beam is larger, and the maximum height difference can reach the outer diameter d of the beam 1 2 times of the total weight of the composition.
Disclosure of Invention
Aiming at the defects of the traditional bending method or the common stamping and bending method of the arched pipe fitting, the invention provides a bending forming die and a bending method of the arched pipe fitting. The invention can simultaneously form two curved fillets at the inner ends and the outer ends of the left curved neck and the right curved neck in one working procedure, and has high production efficiency.
The technical scheme adopted by the invention for solving the technical problem is as follows: a bending forming die for an arched pipe fitting comprises an upper die, an upper die plate, a lower die plate, a left side die, a right side die, a cushion die, a pressing block, a guide plate and an ejector rod, wherein the upper die is connected with the upper die plate and fixed on a main sliding block of a three-way hydraulic machine; the bottom of the lower die is provided with a boss with the length L, the boss is embedded into a key groove a of the lower template, the left side and the right side of the boss are supported on the upper plane of the lower template, and the lower template is installed on a workbench of the three-way hydraulic press. The left side bent neck and the right side bent neck are bent upwards and form an included angle B with the cross beam 1 (ii) a The left fist part and the right fist part are bent downwards and form an included angle B with the beam 0 (ii) a The cross section external diameter of the cross beam, the left side bent neck and the right side bent neck is phi d 1 Wall thickness t 1 The outer diameter phi d of the cross section of the left fist part and the right fist part 2 Is less than d 1 Wall thickness t 2 Greater than t 1 (ii) a Height difference H between the left-end fist part, the right-end fist part and the beam 1 ＝(1.2～2.0)d 1 。
The left side die and the right side die are identical in structure, connected to the left side template and the right side template and mounted on a left sliding block and a right sliding block of the three-way hydraulic machine. The left side die is a block-shaped body with a narrow upper part and a wide lower part, and a cushion die and a pressing block are arranged in the middle of the inner side and used for clamping the end part of the tube blank; flanges are arranged on the front side and the rear side of the lower part of the left side die, a half I-shaped guide plate is arranged between the flange and the lower die plate, a lower arm of the guide plate is embedded into a key groove b of the lower die plate, and an upper arm of the guide plate is pressed on the flange of the left side die through a sliding plate c, so that the guide of the left side die during the process of feeding is ensured, and a left sliding block of the hydraulic machine is prevented from being subjected to the action of bending moment; the left side die slides left and right on the lower die plate, and a sliding plate a and a sliding plate b are arranged between the left side die and the lower die plate.
The lower die is of a strip-shaped block structure, the bottom of the lower die is provided with a boss, the upper side of the lower die is provided with a cavity, the middle cavity is a semi-cylindrical hole or a stepped semi-cylindrical hole, and the radius of the middle cavity is R 5 Length L of 1 (ii) a The left side and the right side of the middle cavity are upwards warped to form a bent neck, and the radius of the semicircular holes of the left bent neck cavity and the right bent neck cavity is R 5 Forming a lower die bending fillet I with the middle cavity; the left end cavity and the right end cavity are bent downwards to form a lower die bending fillet II with the bent necks on the left side and the right side. The cavity of the lower die bending fillet I and the cavity of the lower die bending fillet II are semiellipse, and the long axis b in the front-back direction 1 ＝(2.10-2.20)R 5 Short half axis a in the height direction 1 ＝(0.84-0.94)R 5 . Height difference H of left end cavity, right end cavity and middle cavity 2 ＝(2.4～4.0)R 5 。
The length L and the height H of the lug boss arranged at the bottom of the lower die directly influence the strength of the lower die, and the length L is the length L of the middle cavity 1 1.40-1.60 times of (A), and the height H is not less than 50mm.
The lower bolster is the block, goes up the plane middle part and sets up keyway an of long L, dark H for hold the boss of lower mould bottom, go up the plane and set up the keyway c of installation slide b about both ends middle part. The lower parts of the front side and the rear side of the left end and the right end of the lower template are provided with key slots b for accommodating lower arms of the guide plates, and the guide plates are fixed on the lower template through screws. The lower part of the lower template is provided with a mandril hole and a screw hole.
The lower template is arranged on a workbench of a three-way hydraulic press, and the center of the lower surface of the lower template is provided with a diameter d 3 The diameter d is arranged at the center of the upper surface of the worktable of the hydraulic press 3 The cylindrical hole ensures the accurate positioning of the die on the workbench through the installation center key, and simultaneously prevents the die from moving left and right during working.
The bending forming method of the arched pipe fitting comprises the following process steps:
step 1:
and (4) feeding the tube blank. The ejector rod is ejected upwards, the feeding manipulator places the tube blank on the ejector rod, and the axis of the tube blank is equal to the axis of the central hole of the left side die and the right side die in height.
Step 2:
the tube blank is positioned left and right, and the left slide block and the right slide block of the three-way hydraulic press respectively drive the left side die and the right side die to advance, so that the end part of the tube blank slides into the inner cavity of the pressing block and is propped against the front plane of the cushion die.
And step 3:
in the first stage of bending, the main slide block of the three-way hydraulic press drives the upper die to compress the middle part of the pipe blank downwards, and the rolling reduction s 1 ，s 1 The total pressure s is 0.20-0.30 times of the total pressure s, the ejector rod supports the middle part of the tube blank to synchronously move downwards, meanwhile, the left slide block and the right slide block of the hydraulic press drive the left side die and the right side die to be inwardly fed from two sides, and the single-side feeding amount s 2 ，s 2 ＝(0.40～0.60)s 1 。
And 4, step 4:
the second stage bending, the main slide block of the three-way hydraulic press drives the upper die to continuously press down by a pressing amount s 3 Is 0.45-0.55 times of total pressure s, the ejector rod supports the pipe blank to synchronously move downwards, and the left side die and the right side die do not feed.
And 5:
in the third stage of bending, the main slide block of the three-way hydraulic press drives the upper die to continuously press down s 4 Until the parting surfaces of the upper die and the lower die are matched, the ejector rod supports the pipe blank to synchronously move downwards; meanwhile, the left slide block and the right slide block of the hydraulic press drive the left side die and the right side die to be in-process, and the single-side feed amount s 5 ＝(0.40～0.60)s 4 。
And 6:
the left slide block and the right slide block of the three-way hydraulic press respectively drive a left side die and a right side die to return, and the main slide block of the three-way hydraulic press drives an upper die to return;
and 7:
the ejector rod ejects the arched pipe fitting out, and the part taking manipulator takes out the parts.
The invention has the beneficial effects that: the invention can manufacture the arc pipe fitting with large fall, and the fall between the left fist part and the beam can reach 2 times of the outer diameter of the beam; the forming quality is good, the thickness reduction rate of the outer side wall of the bending fillet is small, no corrugation is generated on the inner side, and no collapse is generated on the cross section; in a process, two bent fillets at the inner ends of the left bent neck and the right bent neck and two bent fillets at the outer end are formed simultaneously, and the production efficiency is high.
Drawings
The bending forming die and the bending method of the arcuate pipe are further described with reference to the accompanying drawings and embodiments.
FIG. 1 is a schematic view of a segment of a pipe;
FIG. 2 is a schematic structural diagram of a cross section of a curved fillet I of an arched pipe;
FIG. 3 is a front (cross-sectional) view of a bend forming die for arcuate tubing;
FIG. 4 isbase:Sub>A sectional view A-A ofbase:Sub>A front view ofbase:Sub>A bend forming die for arcuate tube members;
FIG. 5 is a schematic structural view of a lower die of a bending forming die for an arcuate tube;
FIG. 6 is a sectional view B-B of the middle cavity of the lower die of the bending forming die for the arched pipe fitting;
FIG. 7 is a C-C section view of a lower die bending fillet I cavity of a bending forming die for an arched pipe fitting;
FIG. 8 is a schematic illustration of the left side die of the bend forming die for arcuate tubing;
FIG. 9 is a P-view of the left side of the bend forming die for arcuate shaped pipe elements;
FIG. 10 is a schematic view of the lower die plate of the bend forming die for the arcuate tube;
figure 11 is a B-B cross-sectional view of the bend forming die lower platen for arcuate tubing.
In the attached drawings, 1-an arched pipe fitting, 1 a-a left end fist part, 1a '-a right end fist part, 1 b-a left side bent neck, 1b' -a right side bent neck, 1 c-a cross beam, 1 d-a pipe fitting bending fillet I,1 e-a pipe fitting bending fillet II, 2-a left side template, 2 a-a right side template, 3-a left side template, 3 a-a right side template, 3 b-a flange, 4-a cushion template, 5-a pressing block, 6-an upper template, 7-an upper template, 8-a guide plate and 9-a lower template, 9 a-key groove a,9 b-key groove b,9 c-key groove c,9 d-ejector rod hole, 9 e-screw hole, 9 f-positioning hole, 10-ejector rod, 11-lower die, 11 a-left end die cavity, 11a '-right end die cavity, 11 b-left side neck bending die cavity, 11b' -right side neck bending die cavity, 11 c-middle die cavity, 11 d-lower die bending fillet I,11 e-lower die bending fillet II,11 f-boss and 12 sliding plate a, 13-sliding plate b and 14-sliding plate c.
Detailed Description
Examples
A bending forming die for an arched pipe fitting is used on a three-way hydraulic press. The forming die comprises an upper die 7, an upper die plate 6, a lower die 11, a lower die plate 9, a left die 3, a right die 3a, a left die plate 2, a right die plate 2a, a cushion die 4, a pressing block 5, a guide plate 8, an ejector rod 10 and the like. The upper die 7 is connected with the upper die plate 6 through a screw and is fixed on a main sliding block of the three-way hydraulic machine; the lower die 11 is embedded into a key groove a (9 a) of the lower die plate 9 through a boss 11f with the length L arranged at the bottom, two sides of the boss at the bottom of the lower die 11 are supported on the upper plane of the lower die plate 9, and the lower die plate 9 is installed on a workbench of a three-way hydraulic machine.
The left side die 3 and the right side die 3a have the same structure, are connected to the left side die plate 2 and the right side die plate 2a, and are arranged on a left sliding block and a right sliding block of the three-way hydraulic machine. The left side die 3 is a block-shaped body with a narrow upper part and a wide lower part, and a cushion die 4 and a pressing block 5 are arranged in the middle of the inner side and used for clamping the end part of the tube blank; flanges 3b are arranged on the front side and the rear side of the lower part of the left side die 3, a half I-shaped guide plate 8 is arranged between the flanges 3b and the lower die plate 9, a lower arm of the guide plate 8 is embedded into a key groove b (9 b) of the lower die plate 9, and an upper arm of the guide plate 8 is pressed on the flange 3b of the left side die 3 through a sliding plate c (14), so that the guide is ensured when the left side die 3 is in operation, and a left sliding block of a hydraulic machine is prevented from being subjected to the action of bending moment; the left side die 3 slides left and right on the lower die plate 9, and a sliding plate a (12) and a sliding plate b (13) are arranged between the left side die and the lower die.
The lower die 11 is of a strip-shaped block structure, the bottom of the lower die is provided with a boss 11f with the length of L, the upper side of the lower die is provided with a cavity, the middle cavity 11c is a semi-cylindrical hole or a step-shaped semi-cylindrical hole, and the length of L is L 1 =980mm, radius R 5 =61.5mm, and the transition arc radius R of the cavity and the upper plane 6 =15mm; the left and right sides of the middle cavity 11c are tilted upwards to form a neck, and the radius R of the left neck cavity 11b and the right neck cavity 11b' is 5 A semicircular hole of =61.5mm, and a lower die bending fillet I (11 d) is formed with the middle cavity 11 c; the left end cavity 11a and the right end cavity 11a' are bent downwards to form a lower die bending fillet II (11 e) together with the left and right bent necks. The cavities of the lower die bending fillet I (11 d) and the lower die bending fillet II (11 e) are semiellipse, and the long axis b in the front-back direction 1 =134mm, minor axis a in the height direction 1 =53mm, and the radius R of the transition arc between the cavity and the upper plane 7 =15mm. The height difference H between the left end cavity (11 a), the right end cavity (11 a') and the middle cavity 11c 2 =200mm, radius R 5 3.25 times of the total weight of the powder.
The length L and the height H of the boss 11f arranged at the bottom of the lower die directly influence the strength of the lower die, and the length L =1520mm and the height H =90mm.
The lower template 9 is a block body, a key groove a (9 a) with a length L and a depth H is arranged in the middle of the upper plane and used for accommodating a boss 11f at the bottom of the lower die 11, and key grooves c (9 c) for installing sliding plates b (13) are arranged in the middle of the left end and the right end of the upper plane. Key grooves b (9 b) are formed in the lower portions of the front side and the rear side of the left end and the right end of the lower template 9 and used for containing lower arms of the guide plate 8, and the guide plate 8 is fixed on the lower template 9 through screws. The lower part of the lower template 9 is provided with a mandril hole 9d and a screw hole 9e.
The lower template 9 is arranged on a workbench of a three-way hydraulic press, and the center of the lower surface of the lower template 9 is provided with a diameter d 3 A positioning hole 9f with a diameter of = 120mm, and a diameter d is arranged at the center of the upper surface of a workbench of the hydraulic press 3 The cylindrical hole ensures the accurate positioning of the die on the workbench through the installation center key, and simultaneously prevents the die from moving left and right during working.
The left bent neck 1b and the right bent neck 1b' of the bow-shaped pipe 1 obtained by bending are bent upwards and are positioned between the cross beam 1cRespectively have an included angle of B 1 =47.2 °, a pipe bend fillet I (1 d) is formed; the left fist part 1a and the right fist part 1a' are bent downwards to form a pipe bending fillet II (1 e). The cross sections of the cross beam 1c, the left bent neck 1b and the right bent neck 1b' are hollow circles, and the outer diameter d 1 = 121mm, wall thickness t 1 =15mm; the cross section external diameter d of the left fist part 1a and the right fist part 1a 2 = 115mm, wall thickness t 1 =16mm; the cross sections of the pipe fitting bending fillet I (1 d) and the pipe fitting bending fillet II (1 e) are hollow ellipses, and the long axes b in the front and back directions 0 =132mm and a minor axis in the height direction of a 0 =104mm; inside radius R of pipe bending fillet I (1 d) 1 =110mm, outside radius R 2 =230mm; the inner side radius of the pipe fitting bending fillet II (1 e) is R 3 =105mm, outside radius R 4 =170mm. The beam 1c is a step-shaped circular tube, and two sides of the beam are higher than the middle part by H 0 =25mm. The included angles between the left fist part 1a and the right fist part 1a' and the beam 1c are B 0 =3 °, height difference H from the beam 1c 1 ＝200mm。
A method of forming an arcuate tube bend forming die as claimed in claim 1, including the steps of:
step 1:
the tube blank is fed, the ejector rod 10 is ejected upwards, the feeding manipulator places the tube blank on the ejector rod 10, and the axis of the tube blank is equal to the axis of the center holes of the left side die 3 and the right side die 3a in height.
And 2, step:
the tube blank is positioned left and right, and a left slide block and a right slide block of the three-way hydraulic press respectively drive a left side die 3 and a right side die 3a to work in, so that the end part of the tube blank slides into the inner cavity of the pressing block 5 and is propped against the front plane of the cushion die 4.
And 3, step 3:
in the first stage of bending, a main sliding block of a three-way hydraulic press drives an upper die 7 to press the middle part of a pipe blank downwards by a pressing amount s 1 ＝50mm，s 1 0.25 times of total pressure drop s =200 mm; the ejector rod 10 supports the middle part of the tube blank to synchronously move downwards, and simultaneously the left slide block and the right slide block of the hydraulic press drive the left side die 3 and the right side die 3a to be in-process from two sides, and the single-side feed amount s 2 ＝25mm。
And 4, step 4:
in the second stage of bending, the main slide block of the three-way hydraulic press drives the upper die 7 to continuously press down by a pressing amount s 3 =100mm, the ejector rod 10 supports the tube blank to synchronously move downwards, and the left side die 3 and the right side die 3a do not feed.
And 5:
in the third stage of bending, the main slide block of the three-way hydraulic press drives the upper die 7 to continuously press down by a pressing amount s 4 =50mm, the ejector rod 10 supports the pipe blank to synchronously move downwards until the parting surfaces of the upper die 7 and the lower die 11 are matched; meanwhile, the left slide block and the right slide block of the hydraulic press drive the right side die 3a of the left side die 3 to be fed inwards from two sides, and the feeding quantity s of one side 5 ＝25mm。
And 6:
the left sliding block and the right sliding block of the hydraulic press respectively drive the left side die 3 and the right side die 3a to return, and the main sliding block of the hydraulic press drives the upper die 7 to return.
And 7:
the top rod 10 ejects the arched pipe fitting 1, and the workpiece taking manipulator takes out the workpiece.

Claims (5)

1. The utility model provides a crooked forming die of bow-shaped pipe fitting, bow-shaped pipe fitting comprises crossbeam (1 c), left side curved neck (1B), right side curved neck (1B '), left end fist portion (1 a), right-hand member fist portion (1 a '), left side curved neck (1B), right side curved neck (1B ') kickup, is B with crossbeam (1 c) contained angle 1 (ii) a The left fist part (1 a) and the right fist part (1 a') are bent downwards, and form an included angle B with the beam (1 c) 0 (ii) a The cross section outer diameters of the cross beam (1 c), the left side bent neck (1 b) and the right side bent neck (1 b') are phi d 1 Wall thickness t 1 The cross-sectional outer diameter phi d of the left fist part (1 a) and the right fist part (1 a') 2 Is less than d 1 Wall thickness t 2 Greater than t 1 (ii) a The height difference H between the left fist part (1 a), the right fist part (1 a') and the beam (1 c) 1 ＝(1.2～2.0)d 1 (ii) a The method is characterized in that: the bending forming die comprises an upper die (7), an upper die plate (6), a lower die (11), a lower die plate (9), a left die (3), a right die (3 a), a left die plate (2), a right die plate (2 a), a cushion die (4), a pressing block (5), a guide plate (8) and an ejector rod (10); the upper die (7) is connected with the upper die plate (6) and fixed on the three directionsA main sliding block of the hydraulic press; the bottom of the lower die (11) is provided with a boss (11 f) with the length L, the boss (11 f) is embedded into a key groove a (9 a) of the lower template (9), the left side and the right side of the boss (11 a) are supported on the upper plane of the lower template (9), and the lower template (9) is installed on a workbench of a hydraulic machine;
the left side die (3) and the right side die (3 a) have the same structure, are connected to the left side template (2) and the right side template (2 a), and are arranged on a left sliding block and a right sliding block of the three-way hydraulic machine; the left side die (3) is a block-shaped body with a narrow upper part and a wide lower part, and a cushion die (4) and a pressing block (5) are arranged in the middle of the inner side and are used for clamping the end part of the tube blank; flanges (3 b) are arranged on the front side and the rear side of the lower part of the left side die (3), a half I-shaped guide plate (8) is arranged between the flange (3 b) and the lower die plate (9), the lower arm of the guide plate (8) is embedded into a key groove b (9 b) of the lower die plate (9), and the upper arm of the guide plate (8) is pressed on the flange (3 b) of the left side die (3) through a sliding plate c (14), so that the guide is ensured when the left side die (3) is in operation, and the left sliding block of the three-way hydraulic machine is prevented from being bent; the left side die (3) slides left and right on the lower die plate (9), and a sliding plate a (12) and a sliding plate b (13) are arranged between the left side die and the lower die plate;
the lower die (11) is of a strip-shaped block structure, the bottom of the lower die is provided with a boss (11 f), the upper side of the lower die is provided with a cavity, the middle cavity (11 c) is a semi-cylindrical hole or a step-shaped semi-cylindrical hole (figure 6), and the length of the middle cavity is L 1 Radius R 5 ，R 5 Is smaller than the outer radius (i.e. d) of the cross beam (1 c) 1 /2) 0.5-1.0 mm larger; the left side and the right side of the middle cavity (11 c) are tilted upwards to form a bent neck, and the semi-circular hole radius of the left bent neck cavity (11 b) and the right bent neck cavity (11 b') is R 5 A lower die bending fillet I (11 d) is formed with the middle cavity (11 c); the left end cavity (11 a) and the right end cavity (11 a') are bent downwards to form a lower die bending fillet II (11 e) together with the bent necks on the left side and the right side; the cavities of the lower die bending fillet I (11 d) and the lower die bending fillet II (11 e) are semiellipses, the long axis is in the front-back direction, and the short half axis is in the height direction; the height difference H between the left end cavity (11 a), the right end cavity (11 a') and the middle cavity (11 c) 1 ＝(2.4～4.0)R 5 ；
The lower template (9) is a block, a key groove a (9 a) with the length L and the depth H is arranged in the middle of the upper plane and used for accommodating a boss (11 f) at the bottom of the lower die (11), and key grooves c (9 c) for mounting sliding plates b (13) are arranged in the middle of the left end and the right end of the upper plane; key grooves b (9 b) are formed in the lower portions of the front side and the rear side of the left end and the rear end of the lower template (9) and used for containing lower arms of the guide plate (8), and the guide plate (8) is fixed on the lower template (9) through screws; the lower part of the lower template (9) is provided with a mandril hole (9 d) and a screw hole (9 e).
2. Bending mould for arcuate tubes according to claim 1, wherein: the cavities of the lower die bending fillet I (11 d) and the lower die bending fillet II (11 e) are semi-ellipses, and the long axes b in the front-back direction 1 ＝(2.10-2.20)R 5 The minor axis a in the height direction 1 ＝(0.84-0.94)R 5 。
3. The bend forming die for arcuate tube as claimed in claim 1, wherein: the length L and the height H of a boss (11 f) at the bottom of the lower die (11) directly influence the strength of the lower die, and the length L of the boss is the length L of a middle cavity (11 c) 1 1.40-1.60 times of (A), and the height H is not less than 50mm.
4. The bend forming die for arcuate tube as claimed in claim 1, wherein: the lower surface center processing diameter d of the lower template (9) 3 A positioning hole (9 f) for setting a diameter d at the center of the upper surface of the table of the three-way hydraulic press 3 The cylindrical hole of (3) guarantees the accurate positioning of mould on the workstation through installation center key, prevents simultaneously that the mould from controlling the drunkenness at the during operation.
5. A method of forming a bow-shaped pipe bending die according to claim 1, wherein: the method comprises the following steps:
step 1:
the method comprises the following steps that a pipe blank is fed, a push rod (10) is pushed upwards, and a feeding manipulator places the pipe blank on the push rod (10) to ensure that the axis of the pipe blank is equal to the axis of central holes of a left side die (3) and a right side die (3 a) in height;
and 2, step:
the pipe blank is positioned left and right, a left sliding block and a right sliding block of the three-way hydraulic press respectively drive a left side die (3) and a right side die (3 a) to work in, so that the end part of the pipe blank slides into the inner cavity of the pressing block (5) and is propped against the front plane of the cushion die (4);
and step 3:
in the first stage of bending, a main sliding block of a three-way hydraulic press drives an upper die (7) to press the middle part of a pipe blank downwards by a pressing amount s 1 The total pressure s is 0.20-0.30 times of the total pressure s, the ejector rod (10) supports the middle part of the tube blank to synchronously move downwards, and simultaneously the left slide block and the right slide block of the hydraulic press drive the left side die (3) and the right side die (3 a) to be fed inwards from two sides, and the single-side feed amount s 2 ＝(0.40～0.60)s 1 ；
And 4, step 4:
in the second stage of bending, the main slide block of the three-way hydraulic press drives the upper die (7) to continuously press down by a pressing amount s 3 The total pressure s is 0.40-0.60 times, the ejector rod (10) supports the pipe blank to synchronously move downwards, and the left side die (3) and the right side die (3 a) do not feed;
and 5:
in the third stage of bending, the main slide block of the three-way hydraulic press drives the upper die (7) to continuously press down by a pressing amount s 4 The ejector rod (10) supports the pipe blank to synchronously move downwards until the parting surfaces of the upper die (7) and the lower die (11) are matched; meanwhile, the left slide block and the right slide block of the hydraulic press drive the left side die (3) and the right side die (3 a) to be fed inwards from two sides, and the feeding quantity s of one side 5 ＝(0.40～0.60)s 4 ；
And 6:
the left slide block and the right slide block of the three-way hydraulic press respectively drive the left side die (3) and the right side die (3 a) to return, and the main slide block of the three-way hydraulic press drives the upper die (7) to return;
and 7:
the top rod (10) ejects the arched pipe fitting (1) out, and the part taking manipulator takes out the parts.
CN202211068704.3A 2022-09-02 2022-09-02 Bending forming die and bending method for arched pipe fitting Active CN115318899B (en)

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