CN101804429A

CN101804429A - Bending process of double-layer pipe

Info

Publication number: CN101804429A
Application number: CN 201010137287
Authority: CN
Inventors: 刘艳
Original assignee: Dongguan City Qifeng Muffler Co Ltd
Current assignee: Dongguan City Qifeng Muffler Co Ltd
Priority date: 2010-03-26
Filing date: 2010-03-26
Publication date: 2010-08-18

Abstract

The invention relates to a bending process of a double-layer pipe, which comprises the following steps that: an outer layer pipe is fed; an inner layer pipe is fed; one end of the inner layer pipe is made into a flared end; the other end of the inner layer pipe is plugged to form a plugging end; the inner and the outer layer pipes are assembled and welded; special solid stuffing for bending pipe is filled inside the pipes; the inner and the outer layer pipes are bent; the special solid stuffing for bending pipe is dissolved; the pipes are cut; and the double-layer pipes are examined. The bending process has the advantages that the solid stuffing is filled between the two layers of pipe, so the stuffing between the two layers of the pipe is free from being smashed during the pipe bending process, effective supporting between the two layers of the pipe can be realized, a satisfactory distance between the outer side surface of the inner layer pipe and the outer layer pipe after the pipe is bent can be maintained, the shape of the bending part is smooth and aesthetic, and the function of the double-layer pipe can be adequately played in the application.

Description

A kind of bent tube technique of bimetallic tube

Technical field

The present invention relates to a kind of bent tube technique of bimetallic tube.

Background technology

In the prior art, because bimetallic tube has inside and outside two-layer tube wall, therefore, bimetallic tube adds man-hour at bend pipe, and its difficulty of processing is bigger.Especially be the bimetallic tube of compromise face for inner layer tube wall, because of its inner tubal wall surface irregularity, when bend tension, the filling material all can't produce rational action effect to inner layer tube wall.

In the prior art, the bent tube technique of bimetallic tube is:

Outer tube blanking → inner tube blanking → all enlargings of inner tube two ends → pipe end of inside and outside layer pipe assembling and spot welding → shutoff → topping up body filler → freezing → bend pipe → fill thing → drying → Pipe Cutting → final inspection in washing away → dissolving.

The old technology existing problems:

One, because the solid-state back of the freezing one-tenth of original liquid filler fragility is big, easily pulverize during bend pipe, the support of pipe was easily lost efficacy, cause the inner tube curved outer to contact, thereby reduced the effect of bimetallic tube, and crooked position becomes flat more serious with outer tube.

Two, the anti-icing fluid in the refrigerator is to the product facility seriously corroded, causes product to get rusty and service life of equipment obviously shortens.

Three, because refrigerator has used freon, do not meet environmental requirement.

Four, because the freezing time needed more than 10 hours, the production cycle is long.

Five, because refrigerator is configured in by the bending machine ice-cold humidity, work under bad environment.

Summary of the invention

The present invention is directed to above-mentioned existing in prior technology weak point, a kind of bend pipe new technology of bimetallic tube is provided, the bend pipe new technology of bimetallic tube of the present invention, use the solid filling between the two-layer pipe, charges in the time of can guaranteeing bend pipe between the two-layer pipe can not pulverized, and realize the effective support between the two-layer pipe, thereby make inner tube curved outer and outer tube behind the bend pipe keep satisfied distance, given full play to the effect of bimetallic tube, and crooked position shape slyness is attractive in appearance.

Simultaneously, the bend pipe new technology of bimetallic tube of the present invention does not re-use refrigerator, or else can cause the heavy corrosion of anti-icing fluid to product facility.

Owing to do not re-use refrigerator, just do not use freon, help environmental requirement.

Owing to saved freezing operation, the production cycle shortens greatly, and working environment obviously improves.

For realizing above-mentioned purpose, the present invention takes following technical scheme:

Implement the bend pipe new technology of bimetallic tube, described technology comprises the steps:

A. outer tube blanking;

B. inner tube blanking;

C. next an end of inner tube is made flared end;

D. then the other end of inner tube is carried out shutoff, make the shutoff end;

E. next with inner tube, outer tube assembling welding;

F. fill special solid stuffing for bending pipe;

G. carry out the bend pipe operation;

H. dissolve special solid stuffing for bending pipe;

I. Pipe Cutting;

J. final inspection.

The described end with inner tube of step c is made flared end and is meant flared end is diffused into the degree that edge and outer tube can overlap.

The described other end with inner tube of steps d carries out shutoff and is meant this port cover closure, no longer stays any air gap.

Step e is described to be meant inner tube, outer tube assembling welding with the flared end edge of inner tube and the port welding of outer tube; And, inner tube, outer tube welding are located, and leave the notes thing hole of input material between two-layer pipe by more than one link plate at shutoff end with inner tube.

Step f is described to carry out filling with special solid stuffing for bending pipe, is with such as low melting point Sn-In alloy or low melting point tin-bismuth-metal filling.

Described special solid stuffing for bending pipe is carried out filling after, to its heating, it is dissolved, then the cooling.

Described special solid stuffing for bending pipe being carried out filling, is to add the metal ball filling of diameter less than distance between inner tube, the outer tube therein.

After the described special solid stuffing for bending pipe that will contain the metal ball is carried out filling,, it is dissolved, then cooling to its heating.

Step h is described to carry out heat of solution with special solid stuffing for bending pipe, and then the material between inner tube, the outer tube all will be discharged afterwards.

Compared with prior art, great advantage of the present invention is to use between the two-layer pipe solid filling, charges in the time of can guaranteeing bend pipe between the two-layer pipe can not pulverized, realization is to the effective support between the two-layer pipe, thereby make inner tube curved outer and outer tube behind the bend pipe keep satisfied distance, and crooked position shape slyness is attractive in appearance, has given full play to the effect of bimetallic tube after the use.

Guaranteed to make it accurately to drop into little, helped construction.

Description of drawings

Fig. 1 is the schematic diagram of inner tube in the bent tube technique of a kind of bimetallic tube of the present invention, outer tube blanking;

Fig. 2 is the schematic diagram of inner tube one end enlarging in the bent tube technique of a kind of bimetallic tube of the present invention;

Fig. 3 is the schematic diagram of inner tube one end shutoff in the bent tube technique of a kind of bimetallic tube of the present invention;

Fig. 4 is the schematic diagram of filling material in the bent tube technique of a kind of bimetallic tube of the present invention.

The drawing reference numeral explanation:

1, outer tube

2, inner tube 3, span from

4, link plate

5, cover plate

6, special solid stuffing for bending pipe

11, a port 21, flared end 31, notes thing hole

The specific embodiment

Below in conjunction with the accompanying drawing and the specific embodiment the present invention is further described.

Claims

1. the bent tube technique of a bimetallic tube is characterized in that, described technology comprises the steps:

A. outer tube (1) blanking;

B. inner tube (2) blanking;

C. next an end of inner tube (2) is made flared end (21);

E. next with inner tube (2), outer tube (1) assembling welding;

F. fill special solid stuffing for bending pipe (6);

G. carry out the bend pipe operation;

H. dissolve special solid stuffing for bending pipe (6);

I. Pipe Cutting;

J. final inspection.

2. the bent tube technique of bimetallic tube according to claim 1 is characterized in that:

The described end with inner tube (2) of step c is made flared end (21) and is meant flared end (21) is diffused into the degree that edge and outer tube (1) can overlap.

3. the bent tube technique of bimetallic tube according to claim 1 is characterized in that:

The described other end with inner tube (2) of steps d carries out shutoff and is meant cover plate (5) sealing of this port, no longer stays any air gap.

4. the bent tube technique of bimetallic tube according to claim 1 is characterized in that:

Step e is described to be meant inner tube (2), outer tube (1) assembling welding with flared end (21) edge of inner tube (2) and a port (11) welding of outer tube (1); And, inner tube (2), outer tube (1) welding are located, and leave the notes thing hole (31) of input material between two-layer pipe by more than one link plate (4) at shutoff end with inner tube (2).

5. the bent tube technique of bimetallic tube according to claim 1 is characterized in that:

Step f is described to carry out filling with special solid stuffing for bending pipe (6), is with such as low melting point Sn-In alloy or low melting point tin-bismuth-metal filling.

6. the bent tube technique of bimetallic tube according to claim 5 is characterized in that:

Described special solid stuffing for bending pipe (6) is carried out filling after, to its heating, it is dissolved, then the cooling.

7. the bent tube technique of bimetallic tube according to claim 5 is characterized in that:

Described special solid stuffing for bending pipe (6) is carried out filling, be add therein diameter less than span between inner tube (2), the outer tube (1) from the metal ball filling of (3).

8. the bent tube technique of bimetallic tube according to claim 7 is characterized in that:

After the described special solid stuffing for bending pipe (6) that will contain the metal ball is carried out filling,, it is dissolved, then cooling to its heating.

9. the bent tube technique of bimetallic tube according to claim 1 is characterized in that:

Step h is described to carry out heat of solution with special solid stuffing for bending pipe (6), and then the material between inner tube (2), the outer tube (1) all will be discharged afterwards.