CN101433927A

CN101433927A - Method for bending micro-radius of U-shaped pipe

Info

Publication number: CN101433927A
Application number: CNA2008102348432A
Authority: CN
Inventors: 乔迎才; 唐支翔; 王耀锋; 杨晨; 王承益
Original assignee: NANJING BAOSE CO Ltd
Current assignee: NANJING BAOSE CO Ltd
Priority date: 2008-11-19
Filing date: 2008-11-19
Publication date: 2009-05-20

Abstract

The invention provides a bending method for a micro-radius of a U-shaped pipe of which the elbow pipe radius R is far less than 0.5 time of the pipe diameter. The bending method comprises the following steps: after a straight pipe is filled with steel balls the diameter of which is 5 to 15 percent of the inside diameter of the straight pipe, both ends of the straight pipe are sealed; the straight pipe is bended into the U-shaped pipe of which the elbow pipe radius is 0.5 to 1 time of the inside diameter of the straight pipe; straight-pipe sections opposite to the U-shaped pipe are pressed, so that the straight-pipe sections are close to each other until the required distance is reached; and the steel balls are poured out.

Description

U-shaped pipe method for bending micro-radius

Technical field

The present invention relates to U-shaped pipe method for bending micro-radius.

Technical background

Using the curved U-shaped pipe of special-purpose machines and tools equipment is a kind of mature technique, and traditional bent tube technique method is applicable to clod wash, the requirement of hot bending radius size that standard provides.For example: the elbow radius R of pipe is generally 2～3 times pipe diameter).If the experience size (the U-shaped pipe of 1 times even 0.5 times pipe diameter) that the pipe elbow radius is curved less than standard must adopt special method to bend.As adopt in pipe and irritate sand, rubble, can meltability (fusing point is low than the tubing fusing point) metallic lead or the method for wearing the steel wire rope etc. of suitable dimension.Fill is (soft excessively owing to not possessing support strength in bending the compressive deformation process in the pipes such as this method medium sand, stone, lead, extruding property is bad) and surface support hardness, so being in to bend to defeat, the curved neck of U-shaped pipe compels down, pipe is flat, in to fill thing and then flat, the reversible deformation drag effect that does not have, and fill out thing in traditional and come out in manage pretty troublesome, particularly low-melting-point metal lead is also wanted post bake, complex process and contaminated environment.And bend elbow radius R much smaller than the U-shaped pipe below 0.5 times of pipe diameter, then there is not any bibliographical information mistake so far.

Summary of the invention

The purpose of this invention is to provide the bending method of a kind of elbow radius R much smaller than the little radius of U-shaped pipe below 0.5 times of pipe diameter.

The method of this U-shaped pipe bending micro-radius may further comprise the steps:

A. with after filling up the steel ball that diameter is straight tube internal diameter 5-15% in the straight tube, seal the straight tube two ends;

B. straight tube being bent into elbow radius is the 0.5-1 U-shaped pipe doubly of straight tube internal diameter;

C. suppress the relative straight length of U-shaped pipe, make straight length mutually near the distance that extremely needs;

E. pour out steel ball.

As improvement, d in steps behind step c, before the step e: the curved neck section of U-shaped pipe is carried out full circle with a pair of Hough mould.

As improvement, steel ball is the bearing steel pearl.

This method has solved the problem that elbow radius that the traditional standard empirical data gives can not be too little, satisfied the requirement of particular design to process, fill out thing in the main inventive point of this method is to fill in the pipe and adopt steel ball, bearing steel pearl preferably, it has sliding, pliability, intensity is good, case hardness is good, the conformal situation is good.Fill is (soft excessively owing to not possessing support strength in bending the compressive deformation process in traditional pipe, anti-extruding is bad) and surface support hardness, so being in to bend to defeat, curved neck compels down, pipe is flat, in to fill thing and then flat, the reversible deformation drag effect that does not have, and fill out thing in traditional and come out in manage pretty troublesome, particularly low-melting-point metal lead is also wanted post bake, very difficult and pollution working environment.

With the Hough mould the curved neck section of U-shaped pipe being carried out full circle is to the curved little straightening in neck place.After bend pipe bends, because the slip of inner stuffing supporting frame point reorganization changes when bending distortion, may make curved neck place have certain oval situation, the present invention has adopted the oval trimming of curved neck, and little ellipse at curved neck place is reached and straight tube circularity basically identical.

This method pressure testing system U-shaped pipe bends radius can reach little radius size (for example conventional U-shaped pipe φ 34x7, elbow radius R is at 60～70mm, and among the present invention elbow radius R less than below the 5mm), curved neck place outward appearance polishing, (R＜5mm) the design size requirement of U-shaped pipe, this process also can be suppressed the bend pipe of other specifications to reach little radius.The U-shaped pipe that adopts this method to bend, elbow radius R can the value of reaching capacity R=1mm.

Description of drawings

Fig. 1 is a schematic diagram when bending beginning.

Fig. 2 is the schematic diagram when finishing that bends.

Schematic diagram when Fig. 3 is clamping plate matched moulds shaping beginning.

Fig. 4 is the left view of Fig. 3.

U-shaped pipe schematic diagram when Fig. 5 is clamping plate matched moulds shaping end.

Fig. 6. be curved neck shaping schematic diagram.

Fig. 7 is a Hough mould schematic diagram.

Fig. 8 is the front view of Fig. 7.

Specific embodiments

The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.

U-shaped pipe method for bending micro-radius comprises the steps (accompanying drawing):

Bend:, fill steel ball, the pipe end seal of granularities suitable (diameter be bend pipe internal diameter about 10%) in the straight tube 6 referring to Fig. 1,2.Side by side on the multiple-grooved roller that five are put into the press-bending frock.The press-bending frock comprises the distance plate 2 that plays fixedly multiple-grooved roller effect, multiple-grooved drift 1, and multiple-grooved roller 11, grooved roller set bolt 4, grooved roller bending resistance jacking block 5, roll adjustment plate 3 are the outside plate when packing different size diameter and wall thickness bend pipe distance plate into.Elbow radius is 1 times of straight tube internal diameter.It is curved that the startup hydraulic press slowly is stamped into pipe U-shaped, and clamping plate 3, grooved roller set bolt 4 ensure that not producing deformation in the bend pipe pressing process becomes flat.

The clamping plate matched moulds is shaped: referring to Fig. 3,4, suppress U-shaped Guan Sigen side by side one group put between the template die 8 between gang of cavities 7, the end gang of cavities 9, slowly start hydraulic press, by last gang of cavities and the relative straight length of end gang of cavities compacting U-shaped pipe, make straight length mutually near the distance that extremely needs; This moment, the U-shaped pipe became little radius U-shaped pipe (referring to Fig. 5) under the matched moulds compressive state.

Curved neck shaping: after the clamping plate matched moulds is shaped, because the slip of inner stuffing supporting frame point reorganization changes when the compression of clamping plate matched moulds, make the curved neck place of bend pipe have certain oval situation, adopted the oval trimming of curved neck for this reason, referring to Fig. 6,7,8, start hydraulic press, carry out full circle with the curved neck section of 10 pairs of U-shaped pipes of a pair of Hough mould, the curved neck position circularity that makes curved neck place have little ellipse by root reaches consistent with straight tube circularity.

Fill in the unloading pipe: remove the two ends capping of U-shaped pipe, pour out steel ball, steel ball can be recycled.

This bending method and means, adopt outside limits distortion facility with in fill the thing restrained deformation and combine.Bend pipe bends in the process to stoping under curved power effect, curved neck place is protruding and adopted frock clamping reversible deformation measure to two outside deformation, and interior charges can be played a supporting role on the opposite direction of deformation in that curved neck place is recessed, and are curved recessed to distortion in stoping, and force bend pipe to be shaped by the design size requirement.

Claims

1. U-shaped pipe method for bending micro-radius is characterized in that: may further comprise the steps:

E. pour out steel ball.

2. method according to claim 1 is characterized in that: d in steps behind step c, before the step e: the curved neck section of U-shaped pipe is carried out full circle with a pair of Hough mould.

3. method according to claim 1 is characterized in that: steel ball is the bearing steel pearl.