CN2228389Y

CN2228389Y - Friction welding device for copper-stainless steel pipe

Info

Publication number: CN2228389Y
Application number: CN 95210066
Authority: CN
Inventors: 石凯
Original assignee: XI'AN PETROLEUM COLLEGE
Current assignee: XI'AN PETROLEUM COLLEGE
Priority date: 1995-05-10
Filing date: 1995-05-10
Publication date: 1996-06-05
Anticipated expiration: 2005-05-10

Abstract

The utility model relates to a friction welding device for copper-stainless steel pipes, which is composed of a core rod 1, a gap 2, a welded pipe 3, a gap 4, a pressure maintaining cavity 5 and a shim 6. The utility model is a friction welding device which can control inner shaping copper-stainless steel thin-wall pipes. The friction welding process is completed on a continuous driving friction welding machine, a stainless steel pipe is used as a rotary end, and a steel pipe is used as a fixed end. The outside of the end part of a copper pipe is provided with the full closed pressure maintaining cavity, the core rod with a fixed shape is arranged in the pipe, and weld is carried out according to the defined friction welding technical criterion. The sizes of the pressure maintaining cavity and the core rod are determined by the computational formula of the compression ratio. The utility model is used for weld, has the advantages of few fins, level and smoothness, and ensures the junction with large inner through diameter which can reach 90-97%.

Description

A kind of copper-stainless-steel pipe friction welder

The utility model relates to the friction Butt welding device between foreign material.

At present, to the friction welding (FW) between the foreign material of tubule footpath, mainly be to adopt the mach method of postwelding to remove and the interior burr of cleaning, U.S.'s U54331280 patent is introduced φ 8 millimeters * 1 millimeter tube wall thickness～φ 6.35 millimeters * 0.8 millimeter tube wall thickness copper-aluminum pipe friction welding (FW), the copper pipe end face is processed into the inclined-plane of certain angle, friction is carried out on the inclined-plane, interior latus rectum can reach 70%, latus rectum is less than normal in this result, and only be suitable for the copper-aluminum pipe of little caliber, through the Data acquisition, retrieval etc., copper-stainless-steel wall pipe friction weldering and in the moulding control appliance be blank at home.

The purpose of this utility model is to provide the device of moulding copper-stainless-steel thin-wall pipe friction welding (FW) in a kind of the control, guaranteeing under the various mechanical performance conditions of welding point to reach, the inner nosepiece wall overlap is few, smooth smooth, especially φ 8 millimeters * 1 millimeter tube wall thickness～φ 25 millimeters * 2 millimeter tube wall thickness pipe welding point places there is big as far as possible interior latus rectum.

The utility model be achieved in that comprise taper plug 1, gap 2, by compositions such as bit copper pipe 3, gap 4, pressurize chamber 5, pads 6, before weldering,, use with rub heat-resisting, the high-abrasive material of solderability difference of copper, stainless steel and make totally-enclosed pressurize chamber according to the external diameter of different tubing.Make stationary core rod in the pipe with certain taper with the material of above-mentioned performance according to pipe internal diameter.Taper plug 1 is divided into four parts: the supporting section L1 of taper plug; The Cylinder section L2 of taper plug; The taper work section L3 of taper plug; The extension L4 of conic mandrel bar section L3.Pressurize chamber 5 is divided into two sections: the gripping section B section in the active section A section in totally enclosed pressurize chamber 5 and pressurize chamber 5, its internal diameter is a straight garden tube, 45 ° cone angle and the transition of B section are arranged at the bottom, and A section internal diameter is slightly larger than by the welded tube external diameter, the gripping section B section in pressurize chamber 5 is axially cut open along pressurize chamber 5, along cavity one through hole is arranged radially near the A section, pressurize chamber internal diameter equals or is slightly larger than by the external diameter of bit copper pipe 3.Fixedly taper plug semi-cone angle α is 0.3～1.5 °.Taper plug 1 and pressurize chamber 5 comprise spheroidal graphite cast-iron and chrome-molybdenum steel by making with heat-resisting, the high-abrasive material of copper-stainless-steel friction solderability difference.The friction welding (FW) process is to carry out on the Continuous Drive Friction Welding machine, pressurize chamber 5 diameters, fixedly taper plug 1 diameter and tapering according to by welded tube footpath specification and in the latus rectum requirement.

Advantage of the present utility model is: 1: be applicable to φ 8 millimeters * 1 millimeter tube wall thickness～φ 25 millimeters * 2 millimeter tube wall thickness all size copper-stainless-steel thin-wall pipe friction welding (FW)s, under the condition that guarantees the various mechanical performances of welding point, carry out moulding control in the joint.2: adopt overlap flow and shape in the fixedly taper plug restriction, change the size of controlling interior moulding latus rectum by different semi-cone angle α on the fixing taper plug, the gained inner nosepiece wall is smooth, and interior latus rectum can reach 90～97%.3: select for use and copper, heat-resisting, the high-abrasive material of stainless steel friction solderability difference are made pressurize chamber and taper plug, coat lubricant before the weldering, the inside and outside overlap of extruding in the reduction welding process and the friction of pressurize chamber 4 and taper plug 1, prevent to burn chamber and sticking to mould, improve the service life of equipment.4: help postwelding taper plug 1 and withdraw from, the taking-up of the pipe that welding is good.5: calculate definite pressurize chamber and taper plug size by the compression ratio formula, be equipped with suitable welding condition again, strength of welded joint is higher than copper base metal, and anti-bending strength is good.

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is a left pseudosection of the present utility model;

Now in conjunction with the accompanying drawings the utility model is described further:

Among Fig. 1: taper plug 1, pad 2, be that extension, the taper plug semi-cone angle of conic mandrel bar section L3 is α by bit copper pipe 3, pressurize chamber 5, A section are the active section in pressurize chamber 5, gripping section that the B section is pressurize chamber 5, L1 is the taper plug supporting section, Cylinder section that L2 is the taper plug, taper work section, L4 that L3 is the taper plug.

1, work disposal before the weldering: will be flat before the weldering by bit copper pipe 3 and stainless steel tube end face car, removal oil, rust, water, oxide skin are showed out metallic luster with the emery cloth abrasive end before facing weldering again.

2, pressurize chamber 5 shapes and riding position: welded stainless steel tube is placed in friction-welding machine by collet or other installation way round end.Be placed in non-rotating stiff end by bit copper pipe 3, be equipped with pressurize chamber 5 by bit copper pipe 3 outsides, the A section is the active section in pressurize chamber 5, is totally enclosed type, and internal diameter is garden tube always, and one 45 ° cone angle and the transition of B section are arranged at the bottom.A section internal diameter is slightly larger than by the welded tube external diameter, and between the welded tube external diameter certain clearance is arranged, and its size depends on welded piece diameter and wall thickness, determines than formula by outside allocations.Totally enclosed type pressurize chamber 5 evenly distributes the outer overlap that produces in the friction welding (FW) process and is limited in the external series gap, helps improving friction pressure and makes wall thickness between end force chamber 5 external diameters and the internal diameter get by the welded tube wall thickness 4～6 times.The B section is the gripping section in pressurize chamber 4, with the A section be one, internal diameter equals or is slightly larger than by bit copper pipe 3 external diameters, this section is processed into 1 millimeter garden dish with electric spark and mills along the pressurize cavity and axially cut open, the V-type chuck of the non-rotating fixedly translation of friction-welding machine end is clamped in the B section, will be by 3 clampings of bit copper pipe in case pipe rotation and mobile in the friction welding process by the closure of machining gap.B section bottom has the through hole of 3 millimeters～4 millimeters of φ to be used for crack arrest and is convenient to clamping along cavity diameter near the A section.

3, taper plug 1 shape and riding position, taper plug 1 is placed on by in the bit copper pipe 3.Taper plug 1 can be divided into four parts according to its profile and effect.

(1) L1 is the supporting section of taper plug 1, is supported on the Mobile Slide rear portion, prevents that taper plug 1 from axial float taking place in welding process.

(2) L2 is the Cylinder section of taper plug 1, and external diameter is equal to or slightly less than by the internal diameter of bit copper pipe 3, and length slightly is shorter than by bit copper pipe 3, by the thickness of adjusting pad 2 the L2 high order end is positioned near the last position that forms of weld seam.

(3) L3 is the taper work section L3 of taper plug 1 and the bottom of the close pressurize chamber of L2 intersection 5A section.From taper plug 1 is tapered here, the gap of it and inside pipe wall just in the overlap gap of flowing, be the groundwork section, add and will guarantee high fineness and little form and position tolerance man-hour, stationary core rod semi-cone angle α is respectively: 0.3 °, 1.0 °, 1.5 °.Coat a little lubricant (graphite adds machine oil) before the weldering.

(4) L4 is the extension of 1 section L3 of taper plug, is about 25 millimeters.Effect is that the interior overlap of extruding and roll is limited between the gap of the internal diameter of stainless steel tube and its conical surface, is convenient to postwelding taper plug 1 and withdraws from.Evenly the overlap of resistance to compression between L4 and bore helps reducing the vibration of pipe, and it is steady to help welding process.

Claims

1, a kind of device of copper-stainless-steel thin-wall pipe friction welding by taper plug (1), gap (2), formed by welded tube (3), gap (4), pressurize chamber (5), pad (6), is characterized in that: a: the taper work section L3 of taper plug (1); The extension L4 of conic mandrel bar section L3; B: pressurize chamber (5) are divided into two sections: the gripping section B section of the active section A section in totally enclosed pressurize chamber (5) and pressurize chamber (5), its internal diameter is a straight garden tube, 45 ° cone angle and the transition of B section are arranged at the bottom, and A section internal diameter is slightly larger than by the welded tube external diameter, the gripping section B section in pressurize chamber (5) is axially cut open along the pressurize cavity, the bottom has a through hole near the A section along cavity diameter, and pressurize chamber (5) internal diameter equals or is slightly larger than by the external diameter of bit copper pipe (3).

2, a kind of copper-stainless-steel thin-wall pipe friction welding (FW) device according to claim 1, it is characterized in that: fixedly taper plug (1) semi-cone angle α is 0.3～1.5 °.

3, a kind of copper according to claim 1-stainless copper light-wall pipe friction welding (FW) device is characterized in that: taper plug (1) and pressurize chamber (5) comprise spheroidal graphite cast-iron and chrome-molybdenum steel by making with heat-resisting, the high-abrasive material of copper-stainless-steel friction solderability difference.