CN203390017U

CN203390017U - Flexible core rod used for stretching and bending hollow metal pipe section bar

Info

Publication number: CN203390017U
Application number: CN201320292527.7U
Authority: CN
Inventors: 倪慨宇; 陈漪
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-05-27
Filing date: 2013-05-27
Publication date: 2014-01-15
Anticipated expiration: 2023-05-27

Abstract

Provided is a flexible core rod used for stretching and bending a hollow metal pipe section bar. The flexible core bar is formed by a substrate (30), a plurality of upper cushion blocks (31), a connection sheet (30), a plurality of lower cushion blocks (33), a plurality of positioning bolts (34) and a plurality of inserting dialing sheets (35). Each of the upper cushion blocks (31) is in the shape of a trapezoid, and a threaded hole is arranged on each of the upper cushion blocks; a triangle gap is formed between adjacent upper cushion blocks (31); each of the lower cushion blocks (31) is also in the shape of a trapezoid, and a step hole is arranged in each of the lower cushion blocks; each of the positioning bolts (34) passes through the connection sheet via one step hole and then is threaded in one threaded hole; there is a gap (d) between the upper cushion blocks (31) and the lower cushion blocks (33) when positioning screws are tightly screwed; and the plurality of the inserting dialing sheets (35) can be inserted in the gap. By use of the flexible core bar, it is ensured that a bending surface of a rectangular tube is free from upwards-protruding or downwards-concave deformation defects in a stretch forming process, so quality of stretched and tension-flexure members is ensured.

Description

A kind of flexible plug for stretch bending hollow metal pipe profile

Technical field

The utility model relates to a kind of flexible plug, especially relates to a kind of flexible plug for stretch bending hollow metal pipe profile.

Background technology

Track train since coming out always as a kind of important vehicles and extensive use, particularly in recent years since, high-speed railway passenger development is rapidly.In order to ensure high-speed railway passenger from heavy and light, aluminum alloy materials is widely used among the manufacturing of the appurtenances such as door and window of train, wherein aluminum rectangular tube has obtained technical staff's extensive concern.At present, the aluminum rectangular tube that is applied to the vehicle component such as door pillar, doorframe of track train mainly adopts stretch wrap forming technique to carry out bending, makes it meet the shape need of train composition.

In stretch wrap forming process, first aluminum rectangular tube is applied to the tensile stress close to yield strength, make material enter plastic period; Subsequently, keep this tensile stress rectangular tube is crooked until fit in stretch bending mold; Finally strengthen tensile stress until reach 120% left and right of yield strength.After stretch bending process, the plastic deformation producing in aluminum rectangular tube settles out, and can obtain the satisfactory formed parts of shape.

Due to the aluminum rectangular tube thin-wall section that is hollow, under the substantial load of stretch wrap forming, the effect of Tensile stress or extrusion stress, be out of shape inhomogeneous, the gross distortion that cross section depression can occur or protrudes, the longitudinal surface that causes the aluminum rectangular tube after stretch wrap forming,, usually there is recessed or epirelief in crooked curved interior face particularly.Thereby the stretch wrap forming member section shape of producing all can not meet the requirement as track train door pillar or doorframe component with longitudinal surface configuration.This major defect in shape of stretch wrap forming member, has seriously limited hollow tube section bar that stretch bending process the produces range of application in mechanical field.

In order to solve aluminum rectangular tube, in stretch bending process middle section, there is the problem of the gross distortion of depression or protrusion, Chinese patent document CN1970185A discloses a kind of stretch bending process of hollow extruded aluminum alloy profile, in order to guarantee that longitudinal surface of tubing does not deform, first by one end of tubing solder up closely, sealing end is erect down, from the other end of tubing, fill sand, then pour water in tubing; Subsequently the tubing of filling sand and aqueous mixtures is put into refrigerating chamber freezing, after husky aqueous mixtures freezes, with timber wedge, clog the other end of tubing; Finally pipe clamping is shaped in the enterprising line bend of stretch benders.While adopting this technique, need in tubing, pour into sand and water, then carry out freezing, the loaded down with trivial details production efficiency that affected of operating process.In addition, the intensity that in tubing, canned sand tightness and husky aqueous mixtures freeze after freezing can affect the stability of forming process, but the freezing strength of sand tightness and husky aqueous mixtures is all difficult to control, thereby is difficult to control the stability of forming process.

In order to guarantee the stability of tubing stretch wrap forming, and improve the production efficiency of stretch bending process, need a kind of longitudinal surface of member method that do not deform that can guarantee reliably, easily in stretch bending process process of research and development badly.

Summary of the invention

In order to solve above-mentioned technical problem, the purpose of this utility model has been to provide the clamp pad on a kind of clamping head of can be reliable, convenient, promptly aluminum rectangular tube being fixed on to stretch benders.In order to reach this object, the utility model has adopted following technical scheme.

A kind of flexible plug for stretch bending hollow metal pipe profile, this flexible plug inserts the position to be bent of hollow metal pipe profile, it is characterized in that: described flexible plug consists of substrate, a plurality of upper cushion block, brace, a plurality of lower cushion block, a plurality of bolt and a plurality of plug sheet; Described upper cushion block is trapezoidal, is provided with screwed hole on it, between two adjacent upper cushion blocks, forms a vee; Described lower cushion block is also trapezoidal, is provided with stepped hole on it; Described bolt is screwed into described screwed hole after passing described brace by described stepped hole; Under the state of described bolt locking, between described upper cushion block and lower cushion block, there is Yi Ge gap; Described a plurality of plug sheets can insert described gap (d) along brace.

In a preferred technical scheme, this flexible plug has 12 upper cushion blocks, 12 lower cushion blocks, 24 bolts and 4 plug sheets.

In another optimal technical scheme, four described plug sheet length are successively decreased successively, insert respectively the 1st, 4,7,10 residing positions of cushion block.

Preferably, described substrate (30) and a plurality of upper cushion block (31) are one-body molded.

Advantage of the present utility model is in stretch bending process, this flexible plug is inserted in the cavity of hollow tube section bar, flexible plug is connected to the inner surface of hollow tube section bar cavity, given the ability of hollow tube section bar opposing radial pressure, the crooked inner surface that can ensure hollow tube section bar in stretch bending process there will not be epirelief or recessed etc. is out of shape unexpectedly, can ensure the apparent mass of stretch wrap forming member.

Flexible core bar structure of the present utility model is simple, is easy to manufacture.Install and use process simple and easy, be applicable to repeatedly Reusability.For the hollow tube core of different model specification, easily design different flexible core bar structures, and then improve the scope of application of plug.

Accompanying drawing explanation

Fig. 1 is aluminum rectangular tube schematic diagram;

Fig. 2 is door pillar or the doorframe component finished product schematic diagram after stretch wrap forming;

Fig. 3 is positive two side views of flexible plug of the present utility model;

Fig. 4 is flexible plug cutaway view of the present utility model.

The specific embodiment

Below in conjunction with accompanying drawing, describe performance of the present utility model in detail, but their also paired not restrictions of the present utility model are only for example.Simultaneously by illustrating that advantage of the present utility model will become more clear and easily understand.

As shown in Figure 1, for the production of the raw material of high-speed railway passenger door pillar of the present utility model or doorframe component, be aluminum rectangular tube 1, silicomanganese aluminum rectangular tube particularly.Rectangular tube 1 by rectangular shaped rim 11, in partition 12, upper side edge 13 form, rectangular shaped rim 11 by cut off 12 and separately form two tubular cavities, be i.e. upper plenum 14 and lower cavity 15.Rectangular tube 1 is applied to bending and can obtain high-speed railway passenger door pillar as shown in Figure 2 or the finished product of doorframe component 2.In Fig. 2, door pillar or doorframe component 2 have one or the more than one section of stretching 21 and one or more than one bending section 22.

Required being understood, the flexible plug scope of application of the present utility model includes but are not limited to rectangular tube, can be also the pipe profile in round tube or other different in nature cross sections.The flexible plug scope of application of the present utility model includes but not limited to aluminium alloy hollow pipe profile, can be also the pipe profile of stainless steel hollow tube section bar or other materials.

In order to guarantee that rectangular tube is in stretch bending process process, longitudinally surperficial, the distortion that particularly curved interior face does not meet accident, need to give the ability that tubing is resisted radial pressure.For this reason in the utility model special design the flexible plug in a cavity that can insert aluminum rectangular tube, this flexible plug is given the ability of tubing opposing radial pressure in stretch bending process process, and crooked along with the bending of rectangular tube, thereby guarantee the distortion that curved interior face does not meet accident; After stretch bending process completes, plug can take out and reinstatement in the rectangular tube from bending forming, upper once production, continues to use.

Below with reference to Fig. 3-4, introduce the concrete structure of flexible plug.Flexible plug 3 consists of substrate 30, a plurality of upper cushion block 31, brace 32, a plurality of lower cushion block 33, a plurality of bolt 34 and a plurality of plug sheet 35.

Substrate 30 consists of metal, can produce in the axial direction strain.A plurality of upper cushion blocks 31 are to make trapezoidal block by hard metal, between two adjacent upper cushion blocks 31, form a vee, all have two blind screws on each on cushion block 31.The slip that brace 32 is made for elastic sheet metal, its width is identical with upper cushion block 31, offer above for a plurality of through holes through bolt, in an end of brace 32, be also provided with a drag hook hole lower cushion block 33 for trapezium structure, shape and size match with the triangular cut on upper cushion block 31, all offer two step-like through holes on each lower cushion block 33.Bolt 34 penetrates from the step-like through hole of lower cushion block 33, by after the through hole of brace 32, is screwed in blind screw of cushion block 31.Blind screw hole depth of cushion block in appropriate design is, the length of stepped hole of lower cushion block 33 and the length of bolt 34, make under the state of bolt locking, between upper cushion block 31 and lower cushion block 33, there is Yi Ge space d, the width of this space d is greater than the thickness of brace 32, and preferably the width in this gap is about four times of brace 32 thickness.Like this, when bolt 34 locking, between bolt 34 and the stepped hole of lower cushion block 33, be slidably matched.Plug sheet 35 consists of elastic sheet metal, and its width is equal to or less than the distance between corresponding two bolts, and this plug sheet 35 in use inserts in the gap d between upper cushion block 31 and lower cushion block 33 along brace 2.Plug Pian35 one end has a drag hook hole.

The size of the flexible plug 3 as required size of the tubing of stretch bending is determined.The in the situation that of stretch bending rectangular tube, the curved outer butt of the end face of upper cushion block 31 and rectangular tube, therefore, the end face width of upper cushion block 31 is identical with rectangular tube height; The thickness that the height of upper cushion block 31, lower cushion block 33 is added brace 2 and four plug sheets 35 should equal the width of rectangular tube.

Below for the installation process of the briefing flexible plug of the present utility model of stretch bending rectangular tube.Under original state, 24 bolts are screwed into after the through hole by the stepped hole on lower cushion block 33, brace 2 respectively in the screw of upper cushion block 31 and locking.At this time, owing to having space d between upper cushion block 31 and lower cushion block 33, and lower cushion block 33 is slidably matched with bolt, therefore, and can the sliding along bolt of lower cushion block 33.The height of going up like this cushion block 31, lower cushion block 33 is still less than the rectangular tube width for the treatment of stretch bending after adding the thickness of brace 2, easily the substrate of flexible plug 3 30 end faces is inserted in the cavity of rectangular tube along the curved outer of rectangular tube.Four plug sheets 35 are inserted in the d of space successively along brace 2, and so, space d is occupied full, and lower cushion block 33 is pushed to the curved outer of rectangular tube, and lower cushion block 33 will be connected to the inner surface of the cavity of rectangular tube.Confirm that four plug sheets 35 all accurately insert, after each positioning parts of flexible plug 3 is good, flexible plug 3 is served to stretch benders together with rectangular tube and carry out stretch bending.Due in whole stretch bending process, the surface of upper cushion block 31 and lower cushion block 33 is connected to the inner surface of rectangular tube cavity always, ideally given rectangular tube and resisted the ability of radial pressure, and then guaranteed that the curved interior face of rectangular tube can not produce unexpected distortion.

After stretch bending process completes, by the drag hook hole of plug sheet 35, successively plug sheet 35 is taken out from gap d.Now, due to the existence of gap d, lower cushion block 33 cushion block 31 directions that can make progress are slided, and between flexible plug 3 and the rectangular tube bending, produce and become flexible.Subsequently, by the drag hook hole on brace 2, can at an easy rate whole flexible plug 3 be taken out from the rectangular tube bending.Because substrate 30, brace 2 and plug sheet 35 are in stretch bending process, all in the strain stage, after writing out bending stress, flexible plug 30 is returned to original state.Subsequently, flexible plug just can be among stretch bending be produced next time.

In a preferred embodiment, be provided with 33,24 bolts 34 of 12 lower cushion blocks and four plug sheets 35.The length of four plug sheets 35 is successively decreased successively, and wherein the first plug sheet can insert 1# cushion block, the second plug sheet can insert 4# cushion block, and the 3rd plug sheet can insert 7# cushion block, and the 4th plug sheet can insert 10# cushion block.In the process of plug is installed, according to first to the 4th order, insert successively in the d of space; In unloading the process of plug, the order according to the 4th to first, extracts plug sheet successively out.Because lower cushion block 33 is slidably matched with bolt 34, after four plug sheets take out respectively, the gap of generation again between upper and lower cushion block, makes plug be able to activity in rectangle pipeline section, so experimental results show that the process of taking-up plug is very convenient quick.

Easily expect, the length of each plug sheet and the position of insertion thereof can be adjusted according to technological requirement.

In a further advantageous embodiment, substrate 30 and a plurality of upper cushion block 31 can adopt identical material one-body molded, or obtain by milling vee in bar block of material.

Easily expect, corresponding to the pipe profile of round tube or other odd-shaped cross sections, only need to design the flexible plug of different cross section shape and can realize.

The problem of outside of belly depressed deformation while adopting flexible plug of the present invention can solve the stretching of rectangular metal pipe.The method that this plug adopts layering to take out, compares traditional method and has advantages of simple and practical.Brace and plug sheet adopt resilient steel disc, and adopt a plurality of trapezoid block structures, have guaranteed that this plug is can only bend in one direction not fragile, can adopt common metal manufacture, and cost is low, and processing is quick.For the larger plug of mass ratio, under the prerequisite of proof strength, can do loss of weight and process, easy to operate.

By reference to the accompanying drawings the specific embodiment of the present utility model has been carried out to exemplary description above, obvious scope of the present utility model is not limited to this, and the various distortion of making in the thought the utility model proposes all do not exceed scope of the present utility model.

Claims

1. the flexible plug for stretch bending hollow metal pipe profile, this flexible plug (3) inserts the position to be bent of hollow metal pipe profile, it is characterized in that: described flexible plug (3) consists of substrate (30), a plurality of upper cushion block (31), brace (32), a plurality of lower cushion block (33), a plurality of bolt (34) and a plurality of plug sheet (35); Described upper cushion block (31) is trapezoidal, is provided with screwed hole on it, between two adjacent upper cushion blocks (31), forms a vee; Described lower cushion block (33) is also trapezoidal, is provided with stepped hole on it; Described bolt (34) is screwed into described screwed hole after passing described brace (32) by described stepped hole; Under the state of described bolt (34) locking, between described upper cushion block (31) and lower cushion block (33), there is Yi Ge gap (d); Described a plurality of plug sheets can insert described gap (d) along brace (2).

2. the flexible plug for stretch bending hollow metal pipe profile according to claim 1, is characterized in that: this flexible plug has 12 upper cushion blocks (31), 12 lower cushion blocks (33), 24 bolts (34) and 4 plug sheets.

3. the flexible plug for stretch bending hollow metal pipe profile according to claim 2, is characterized in that: four described plug sheet length are successively decreased successively, insert respectively the 1st, 4,7,10 residing positions of cushion block.

4. the flexible plug for stretch bending hollow metal pipe profile according to claim 1, is characterized in that: described substrate (30) and a plurality of upper cushion block (31) are one-body molded.