CN101963275A

CN101963275A - Hollow tube

Info

Publication number: CN101963275A
Application number: CN2009101612358A
Authority: CN
Inventors: 杨秀珍; 锺清旗
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-07-24
Filing date: 2009-07-24
Publication date: 2011-02-02

Abstract

The invention relates to a hollow tube, in particular to a hollow tube for manufacturing a bicycle frame. The hollow tube is mainly made by the following steps of: supporting a 6-4Ti alloy sheet on a feed mechanism, connecting the 6-4Ti alloy sheet to a forming die after discharging, performing a cold-rolling and punching process, winding along the forming die to form a spiral tube, and then performing welding operation. The tube has the advantages of higher intensity and deformation resistance when used in the bicycle frame.

Description

Hollow tube

Technical field

The present invention is a kind of hollow tube, especially refer to a kind of hollow tube that is used to make the vehicle body of bicycle, it is to make its distortion form spiral helicine hollow tube in the cold-rolling and punching mode 6-4Ti sheet alloy, will obtain preferable intensity and on-deformable hollow tube after the screw thread seam welding.

Background technique

Differentiation along with the epoch, the use of bicycle is except being the basic running vehicle, more become the utensil of complex functions such as having leisure, motion concurrently, government also in each department active development cycle path or bicycle sports place, provides more and more many car user's mouths to use.Because the lifting of bicycle car trader research and development ability, the car type voluntarily of various function is designed moulding successively, so for demands such as the intensity of frame, weight, also be developed generation because of excellent material day by day, and the requirement of very high-quality is arranged.

Look into (seeing also shown in Fig. 1,2), standard bicycle vehicle body tube manufacture, generally make hollow tube 10 (that is: seamed pipe) with the welding of metal materials such as iron, aluminum alloy, it mainly is with the winding up roller extrusion process of sheet metal 11 through roll squeezer, make the sheet metal 11 on plane form the pipe shape, impose weld job in the conglobate sheet metal of roll-in 11 adjacent two ends again, make it form complete hollow tube 10.Look into, the hollow tube of making in the above described manner 10, the welding bead 12 of its welding are to be a straight line again, and multiple these welding bead 12 parts are to be the more weak part of stress with whole hollow tube 10, so the situation that this hollow tube 10 is very easily deformed and destroyed by this weld.So apply to frame for the pipe fitting that obtains better quality, then there is the artificer to attempt adopting Ti metal or titanium alloy as the material of making hollow tube, with Ti metal or and alloy as tubing products, have good mechanical propertys such as antirust, light weight, high strength.But because Ti metal and have special process conditions seems complicated relatively in the processing, and Ti metal is the metal with Memorability, thus have the high elasticity reply volume, technical in the traditional cold processing, must grasp special technology to overcome difficulties.

In view of this, this creator is based on the gains in depth of comprehension of specially grinding this field for a long time, and design research and development under excelsior spirit, qualification is a mother metal with 6-4Ti alloy (Ti-6AL4V), processing method with cold-rolling and punching and welding, obtain the pipe fitting of preferable quality, when making its vehicle body pipe fitting that applies to bicycle, have advantages such as light weight, preferable tensile strength and fatigue performance.

Summary of the invention

Purpose of the present invention, promptly be to improve the not good problem of traditional hollow tube quality, and design a kind of 6-4Ti alloy that welds in a spiral manner, make it form the body of hollow shape, when making this body apply to the frame skeleton, have preferable intensity and on-deformable advantage.

For reaching this purpose, the present invention mainly be with the bearing of 6-4Ti sheet alloy on feedworks, be attached on the forming die after making the discharging of 6-4Ti sheet alloy, after imposing the cold-rolling and punching means earlier, be wound into the helical body along forming die, impose weld job again, make it form hollow tube body.

Description of drawings

Fig. 1 is known hollow tube shaping schematic view.

Fig. 2 is known hollow tube stereogram.

Fig. 3 is a body shaping schematic view of the present invention ().

Fig. 4 is a cold-rolling and punching 6-4Ti sheet alloy schematic representation of the present invention ().

Fig. 5 is a cold-rolling and punching 6-4Ti sheet alloy schematic representation of the present invention (two).

Fig. 6 is a body shaping schematic view of the present invention (two).

Fig. 7 is body welding schematic representation of the present invention.

Fig. 8 is a body stereogram of the present invention.

Fig. 9 is a body draw shaping schematic view of the present invention.

Figure 10 is stereogram behind the body draw of the present invention.

The primary clustering symbol description

One, known structure

10 hollow tubes

11 sheet metals

12 welding beads

Two, the present invention's structure

20 6-4Ti sheet alloys

30 feedworkss

40 forming dies

41 forming endses

42 discharge ends

43 press the limit

50 towards piece

51 inner groovies

60 welding mechanisms

70 bodys

80 pressing molds

Embodiment

The technological means that relevant the present invention is used in order to reach the goal sincerely cooperates the embodiment shown in graphic now again, is described in detail as follows:

See also shown in Figure 3, the present invention mainly be with 20 bearings of 6-4Ti sheet alloy on feedworks 30, make 6-4Ti sheet alloy 20 send through feedworks 30, be attached to after the discharging on the forming die 40, this 6-4Ti sheet alloy 20 has proper width, and thickness is below 3mm, and forming die 40 is cylindric mould rod, front end is a forming ends 41, the rear end then is a discharge end 42, the circle footpath of forming ends 41 is slightly less than discharge end 42, and the surface of forming ends 41 convexes with and press limit 43, and this presses the top position on limit 43, be provided with one towards piece 50, should can go continuous elevating movement because of the transmission of stamping press towards piece 50, have inner groovy 51, and make this inner groovy 51 and press limit 43 and be corresponding shape towards piece 50 bottoms.

Please consult simultaneously shown in Fig. 4,5, when 6-4Ti sheet alloy 20 is delivered to forming die 40 through feedworks 30, have an angle between 6-4Ti sheet alloy 20 and the forming die 40, this angle is preferable with 40 degree to 50 degree; The forming ends 41 of 6-4Ti sheet alloy 20 warp let-off forming dies 40 press limit 43 time, promptly be subjected to towards the punching press of piece 50 and bending deflection, the degree of deformation of this 6-4Ti sheet alloy 20 depends on and presses limit 43 and form fit towards piece 50 bottom inner groovies 51, especially need consider the elastic recovery amount (being memory characteristic) of Ti metal, obtain predetermined circularity after making its punching press, and just be applied in discharge end 42 outer surfaces that are slightly larger than forming ends 41, continuing feeding and repeating under the operation of punching press, this 6-4Ti sheet alloy 20 i.e. moulding one tubular body in a spiral manner, and be applied in the discharge end 42 of forming die 40, after the helix body of making predetermined length, can take out (shown in 6) by the discharge end 42 of forming die 40, and the 6-4Ti sheet alloy 20 behind cold-rolling and punching, the comparatively driving fit of lines gap of its spiral, multiple hold on both sides of the road, weld with welding mechanism 60 and fix and form a hollow tube body 70 (as Fig. 7 in the spiral lamination that the shape hollow tubular product is adjacent in the shape of a spiral, shown in 8).

See also shown in Fig. 9,10, in order to obtain the better 6-4Ti alloy hollow tube of machinery, the body 70 that can again welding be finished imposes draw operation through pressing mold 80 again, it is to utilize pressing mold 80 die cavitys to be slightly less than body 70 external diameters, make behind the punching press draw, the titanium alloy molecular changes, make its crystalline transition become more fine tissue, and then the tensile strength and the fatigue performance of raising titanium alloy, simultaneously, also, make the welding bead on body 70 surfaces disappear the program of having saved body 70 surperficial rubbing downs because of the change of titanium alloy surface molecule.Through the post-job body 70 of the draw, can again body 70 be imposed the stress relief annealing program that about 600 degree are heated under the protection of inert gas, make this body 70 after the stress relief annealing program, keep high strength, but the excellent quality that specific elongation promotes.

By the moulding of above-mentioned body 70, multiple because this body 70 is that 6-4Ti sheet alloy 20 is made its tubular body that forms spiral with cold-rolling and punching distortion in the adjacent both sides end of the spiral lines of this tubular body, welded with welding mechanism 60 and fixedly to be formed body.So the welding bead of this body 70 also on average is distributed in body 70 peripheries around establishing in a spiral manner, make body 70 integrated stress average, so can effectively increase its intensity and reduce amount of deformation, have simultaneously advantages such as splendid tensile strength, lightweight and erosion resisting again because of the 6-4Ti alloy, so when this body 70 applies to the frame pipe fitting, can reach the good effect that promotes bicycle quality and performance.

Address the embodiment shown in the drawings as can be known from above institute, the present invention is compared to general known structure of tube body, really has obvious improvement, and the technological means of its utilization really forms for this creator research and development, so the present invention has met patent requirement really, filing an application in the whence in accordance with the law, and prays and grant patent for praying.In addition, the above structure that is disclosed of the present invention is to be preferred embodiment of the present invention, and the equivalence of doing according to structure of the present invention changes such as, must contain to be placed on claim of the present invention.

Claims

1. hollow tube, it mainly is to make its bending deflection towards the piece punching press and then to obtain predetermined circularity with the 6-4Ti sheet alloy, and be wound in forming die in a spiral manner and form spiral helicine body, welded fixing and a hollow tube body that form with welding mechanism again.

2. hollow tube as claimed in claim 1, it is characterized in that: this 6-4Ti sheet alloy can be sent through feedworks, be attached on the forming die after the discharging, the forming die front end is a forming ends, the rear end then is a discharge end, the circle footpath of forming ends is slightly less than discharge end, and the surface of forming ends convexes with and presses the limit, this top position that presses the limit is to having one towards piece, should can go continuous elevating movement because of the transmission of stamping press towards piece, has inner groovy towards the piece bottom, and make this inner groovy and press the limit and be corresponding shape, when the 6-4Ti sheet alloy is sent forming ends to forming die through feedworks, promptly be subjected to towards the punching press of piece and the circularity that obtains to be scheduled to, this can make 6-4Ti sheet alloy moulding one tubular body in a spiral manner, and a hollow tube is fixed and formed to multiple the welding with welding mechanism in the screw thread seam.

3. hollow tube as claimed in claim 1 is characterized in that: have a charging angle between this 6-4Ti sheet alloy and the forming die, this angle is between 40 degree are spent to 50, and the thickness of 6-4Ti sheet alloy is below 3mm.