CN102107230A

CN102107230A - Shaping device for preparing bent tube by virtue of differential-velocity extrusion of dual male dies

Info

Publication number: CN102107230A
Application number: CN 201010528713
Authority: CN
Inventors: 马叙; 封志龙; 宋继顺; 马静云
Original assignee: Tianjin University of Technology
Current assignee: Tianjin University of Technology
Priority date: 2010-11-03
Filing date: 2010-11-03
Publication date: 2011-06-29
Anticipated expiration: 2030-11-03
Also published as: CN102107230B

Abstract

A forming device for preparing pipe bending parts by differential extrusion with double convex dies. The extrusion forming device includes a mold forming part, a mold fixing part and a guide part; the mold forming part includes a die, a punch, a mandrel and an extrusion block; The mold fixing part includes a base fixing plate, a support seat, a slide plate, and a die fixing plate; the guiding part of the mold includes a guide column, a guide sleeve, a top plate, and a base fixing plate. The invention has the advantages that: the mold adopts horizontal extrusion, which increases the length range of extruded bent pipe fittings. The concave mold and the concave mold fixing plate of the mold forming part are all in the form of blocks, which is convenient for the removal of the workpiece and the re-extrusion of the blank after the extrusion is completed. The mandrel fixing plate is guided by the guide rod and the dovetail groove, and is ejected manually by the screw rod. The center line of the die, the punch and the mandrel are in a straight line, which is easy to assemble and adjust. By changing the extrusion speed of the punches A and B, the extrusion speed difference between the punches A and B is manufactured, and this difference is used to prepare the pipe bending parts. The device has a reasonable structure, simple process, and the wall thickness of the pipe bending parts Uniform and wrinkle-free, no distortion in cross-section, reliable quality, and wide application prospects.

Description

A kind of shaped device of biconvex mould differential extruding preparation pipe bending part

Technical field

In the present invention relates to, the technology of preparing of thin-wall pipes bool, particularly a kind of device of crooked pipe fitting arbitrarily that adopts on the biconvex mould differential extrusion modling plane.

Background technology

Along with the development of molding equipment and manufacturing technology, the pipe bending part of complicated shape is more and more frequent the particularly high in technological content industrial circle appearance of industrial circle, and as the oil transportation of aircraft, boats and ships, automobile, gas pipeline also has the part support.Because use bending pipe fitting to replace original wire rod or plastic pipe, can reduce weight, improve durability.Widespread usage along with pipe bending part, people are also more and more higher to the requirement of the bending quality of tubing and forming technology, the traditional handicraft method is curved as pushing away, there are some defectives mostly in the bending pipe fitting that rolls productions such as bending, as the attenuate of lateral wall with break the thickening of madial wall, defectives such as wrinkling and distortion of cross section, and the angle of bend and the direction of pipe fitting are limited, can not reach any bending.

Summary of the invention

The invention provides a kind of can be in same plane to the different directions bending, the angle of bend scope is 90 °～180 °, and the biconvex mould differential extrusion forming device of the preparation pipe bending part that is controlled of angle of bend.

Technical scheme of the present invention is:

A kind of shaped device that adopts biconvex mould differential extruding preparation pipe bending part, it is characterized in that: extrusion forming device comprises mould molding part, mould fixing part and targeting part; Mould molding partly comprises die, punch, mandrel and crushing block, and concave die cavity top is divided into cylindrical, and discharge end is the frustum of a cone, punch is that semi-annular shape (is seen Fig. 5-f), die, the center line of punch, blank center line and plug central lines, blank is to expect with one heart; Mould fixing part comprises base fixed head, supporting seat, slide plate, die block, die block has dovetail groove, is slidingly matched between slide plate and the fixed head, and die block is connected with die, half of die block is fixed on the base fixed head, and the base fixed head is fixed on the gripper shoe; The center of base fixed head is provided with discharging opening, and mould molding partly is positioned at die block, and mandrel is embedded in the slide plate, and the plug lower end is positioned at die conical outlet place; Targeting part comprises lead, guide pin bushing, top board, base fixed head, slide plate, and guide pin bushing is fixed in the slide plate, joins for little gap cunning between lead and the guide pin bushing, guarantees the accurate slip of slide plate.

The frustum of a cone of described die discharge end, tapering are 45 °～60 °, and frustum height h is 15mm～30mm, and the recipient height is columniform height H 〉=50mm in the concave die cavity.

Bending pipe fitting wall thickness 3mm 〉=t 〉=0.5mm; Angle of bend is 180 ° 〉=α 〉=90 °.

The height of setting punch A is H _A, the height of punch B is H _B, the height of blank is H, the speed of punch A is V _A, the speed of punch B is V _B, then must satisfy:

V _A＞V _BThe time,

V _B＞V _AThe time,

Speed difference between punch A and the punch B is on duty push time of whole blank with fireballing punch must be less than the height of slow-footed punch.

Die, the die block of described mould molding part all adopt block form, are convenient to push the taking-up of workpiece after finishing and the extruding once more of blank.

Operation principle of the present invention:

The present invention, is applied to extruding force respectively on punch A and the B by hydraulic means the metal stock moulding by biconvex mould differential extrusion forming device, and punch A and B obtain different speed under the effect of extruding force separately.Punch A, B are to the motion of blank direction, extrusion billet.Because the movement velocity difference of punch A, B is stressed different with the blank two ends that punch A contacts with B so the power that punch A, B are squeezed on the blank is also different, so the material flowing velocity at blank two ends is also different.There is a speed difference between punch A and the B, produced a uneven velocity field in the process that makes the blank of their effects extrude downwards.This uneven velocity field shows the flow velocity difference of each particle when material flows out, and the speed difference of each material particle has caused the bending of pipe when flowing out.Flow by the control metal material uneven, promptly control the speed difference between punch A and the punch B, can the same plane of moulding in bending arbitrarily, difform pipe bending part.

Advantage of the present invention is: mould adopts horizontal extruding, has improved the length range of extruding bending pipe fitting.The die of mould molding part, die block all adopts block form, is convenient to push the taking-up of workpiece after finishing and the extruding once more of blank.The mandrel fixed head is by guide post and dovetail groove guiding, by screw rod by manually ejecting.Die and punch, mandrel center line point-blank, easy to assembly being easy to adjusted.By changing the extrusion speed of punch A, B, make the extrusion speed difference between punch A, the B, utilize this difference to prepare pipe bending part, this apparatus structure is reasonable, technology is simple, the pipe bending part wall thickness is even and wrinkle resistant, cross section is undistorted, reliable in quality is with a wide range of applications.

Description of drawings

Fig. 1, Fig. 2 are the apparatus structure schematic diagram of any bending pipe fitting in biconvex mould differential extrusion modling plane.

Fig. 3, Fig. 4 are the device A-A generalized section of any bending pipe fitting in biconvex mould differential extrusion modling plane.

Fig. 5 is the typical part perspective view.

Among Fig. 1-4: 1. lead 2. base fixed heads 3. die plate inserts 1,2 4. blanks 5. crushing block A, B 6. die blocks 1,2 7. slide plate 8. guide pin bushings-1 9. leads 10. top boards 11. punch A, B 12. screws-1 13. supporting seat 14. screw rods 15. screw rod fixed heads 16. round pins nail-1 17. screw-2 18. hex nut 19. mandrel 20. screws-3 21. screw-3 22. guide pin bushing-2 23. guide pillar 24. screws-4 25. screw-5 26. round pins nail-2 27. round pins follow closely-3

Among Fig. 5: Fig. 5-a die plate insert 1; Fig. 5-b die plate insert 2; 5-c die plate insert constitutional diagram; The 5-d blank;

Fig. 5-e crushing block combination; Fig. 5-f punch figure; The 5-g mandrel; Fig. 5-h slide plate

The specific embodiment

Embodiment 1:

The shaped device of biconvex mould differential extruding preparation pipe bending part, extrusion forming device comprises mould molding part, mould fixing part and targeting part; Mould molding partly comprises die plate insert 1 and 2, mandrel 19 and crushing block A and B, die plate insert 1,2 is separately fixed on die block 1 and 2 by screw 24 and pin 25, punch is made up of two semi-annular shape cylinders, the die that die plate insert is formed, the geometric center lines of mandrel and punch is positioned at same straight line after the mould assembling; Mould fixing part comprises base fixed head 2, supporting seat 13, slide plate 7, die block 6, on the die block 6-2 dovetail groove is arranged, between slide plate 7 and the die block for being slidingly matched, die block 6-2 is fixed on the base fixed head 2 by screw 21 and pin 27,2 of base fixed heads are fixed on the supporting seat 13 by screw 17 and pin 16, base fixed head 2, supporting seat 13, slide plate 7, die block 6 during processing and manufacturing, the demanding flatness of contact-making surface between them and the depth of parallelism guarantee the accurate location and the operation of mould.The guiding of mould has two kinds of forms, is respectively dovetail groove and guide pillar, guide pin bushing.Mandrel 19 is fixed on the slide plate 7, and slide plate 7 enters in the concave die cavity mandrel by the slip of dovetail groove and lead 9 and guide pin bushing 8 accurately.Sectional type die block 6-1 and 6-2 pass through to guide pillar 23 and guide pin bushing 23 guiding, and be fastening by screw 24.Die plate insert, die block are made the taking-up of depositing in workpiece that sectional type is convenient to blank.The mould pressures partially is punch and crushing block, when the hydraulic press plunger carries the punch operation, at first punch enters the slide plate of fixed central spindle, it between mould lead and the guide pin bushing little matched in clearance, guarantee accurately slipping into of punch, after punch contacted with extruding is fast, the crushing block extrusion billet made it to produce plastic deformation.

In the present embodiment, the internal diameter of bend pipe is 20mm, and wall thickness is 3mm, and blank is 5052 aluminium alloys, and the tapering of die discharge end is 59 °, and spherical radius is 20mm, and the pressure of hydraulic press is 100t, and there is centre bore at the blank center, and temperature is a room temperature.

The working procedure of present embodiment is: after final-assembly die is finished and is fixed on the horizontal hydraulic machine, blank 4 is put into die plate insert 3, mandrel 19 upper ends are fixed on the slide plate 7, and the port of export that crushing block 5 and blank 4 are positioned at die plate insert 3 is passed in plug 19 lower ends; Punch 11-A and 11-B accept the loading of hydraulic press, act on the blank 4 by crushing block 5-A and 5-B, because it is different with the loading on the 11-B that the horizontal hydraulic machine that begins to set acts on punch 11-A, makes punch 11-A obtain different extrusion speed with 11-B under the effect of different extruding forces.Punch 11-A and 11-B are to the motion of blank direction, extrusion billet.Because the movement velocity difference of punch A, B is stressed different with the blank two ends that punch A contacts with B so the power that punch A, B are squeezed on the blank is also different, so the material flowing velocity at blank two ends is also different.There is a speed difference between punch A and the B, produced a uneven velocity field in the process that makes the blank of their effects extrude downwards.This uneven velocity field shows the flow velocity difference of each particle when material flows out, and the speed difference of each material particle has caused the bending of pipe when flowing out.By the uneven field that the control metal material flows, promptly control the speed difference between punch A and the punch B, make tubing bend, thereby obtain our needed pipe bending part.

The pipe bending part wall thickness of present embodiment preparation is even and wrinkle resistant, cross section is undistorted, has a extensive future.

Claims

1. A molding device for preparing pipe bending parts by differential extrusion with double convex dies, characterized in that: the extrusion molding device includes a mold forming part, a mold fixing part and a guide part; the mold forming part includes a die, a punch, a core Shaft and extrusion block, the upper part of the cavity of the concave mold is cylindrical, the discharge end is a conical frustum, the punch is semi-circular, the center line of the die, the center line of the punch, the center line of the billet and the center line of the mandrel coincide, and the billet is Concentric material; mold fixing part includes base fixing plate, support seat, slide plate, die fixing plate, die fixing plate has dovetail groove, sliding fit between sliding plate and fixing plate, die fixing plate is connected with die, and die is fixed Half of the plate is fixed on the base fixed plate, and the base fixed plate is fixed on the support plate; the center of the base fixed plate is provided with a discharge port, the mold forming part is located in the die fixed plate, the mandrel is embedded in the slide plate, and the lower end of the mandrel is It is located at the tapered exit of the die; the guide part includes a guide column, a guide sleeve, a top plate, a base fixing plate, and a slide plate.

2. According to claim 1, the forming device for preparing pipe bending parts by differential extrusion of double convex dies is characterized in that: the truncated cone at the discharge end of the die has a taper of 45° to 60°, and the height h of the truncated cone is 15mm to 30mm, the height of the extrusion cylinder is the height of the cylinder in the cavity of the concave model H≥50mm.

3. According to claim 1, the forming device for preparing pipe bending parts by differential extrusion of double convex dies is characterized in that: the wall thickness of the curved pipe parts formed by the device is 3mm≥t≥0.5mm; the bending angle is 180°≥α≥90 °.

4. According to claim 1, the forming device for preparing pipe bending parts by differential extrusion of double convex dies is characterized in that: the height of the punch A is set to be H _A , the height of the punch B to be H _B , and the height of the blank is is H, the speed of punch A is V _A , and the speed of punch B is V _B , then it must meet:

When V _A >V _B ,

When V _B >V _A ,

5. According to claim 1, the forming device for preparing pipe bending parts by differential extrusion of double convex dies is characterized in that: the die and the die fixing plate of the mold forming part are all in the form of blocks, which is convenient for extrusion After completion, the workpiece is taken out and the billet is extruded again.