Shape-memory composite tube and manufacturing process thereof
The present invention relates to a kind of combined pipe fitting and manufacturing process thereof, relate in particular to a kind of combined marmem pipe and manufacturing process thereof, the engineering pipeline that can be used for every field connects, and belongs to technical field of function materials.In the prior art, generally all adopt the screw thread cutting ferrule to connect for composite pipe, complete in specifications as the equal tee pipe joint that maple leaf company in Zhejiang produces, use more in the engineering.But this linkage structure is very complicated, as the threeway of screw thread cutting ferrule, is made up of ten other parts altogether, installs also comparatively loaded down with trivial details; Simultaneously appearance profile is huge, the copper cutting ferrule be connected the stainless steel color and differ, influence attractive in appearance; Its operational safety is also relatively poor in addition, especially after install connecting, is subjected to the external force effect to produce certain amount of deflection or short period when standing vibration or bearing the pulsation fatigue load, and often leak the joint.Adopted the shape-memory pipe joint to connect in recent years, the material that adopts has shape memory function, and it connects pipe can prevent leakage under the oscillating load condition, and successful Application is at aspects such as hydraulic air pipe and oil water injecting pipe and city water service pipes.This shape-memory pipe joint fitting operation is very convenient, as long as the shape-memory pipe joint that will expand in advance puts the pipe end of desire connection to dress, heating slightly, pipe joint is owing to will recover small-bore state, hold pipe securely tightly so begin to shrink, reach the purpose of connecting tube.Obviously, the pipe memory connection takes up room little, pipe-line system outward appearance grace.When straight line moved towards pipe with the connection of shape-memory pipe joint, cost is also lower, and was when particularly using iron-base marmem pipe joint, equally matched with other general Placement.But this shape-memory pipe joint is connected for elbow, threeway and other pipe fitting, owing to use many pipe joints or transiens pipe fitting, has then improved the overall cost of memory connection pipe fitting.
The objective of the invention is to above-mentioned deficiency, a kind of combined marmem pipe and manufacturing process thereof of new structure is provided, make it to simplify and produce and installation procedure, reduce connection piping overall cost, improve operational safety at prior art.
For reaching such purpose; adopt marmem to make the electrostatic storage tube joint in the technological scheme of the present invention; adopt the argon gas inert gas shielding welder's skill of socializing entirely; make the electrostatic storage tube joint and can weld parent tube and link to each other, near the electrostatic storage tube joint tube wall the attachment weld, a reducing band is arranged by attachment weld.
Electrostatic storage tube joint of the present invention adopts shape-memory material, can be the nitinol memory material, copper base alloy memory material, or material such as iron-base marmem, and its quantity can be one, also can be two or more.Can weld that parent tube is meant can be with the cylindrical tube of electrostatic storage tube joint welding or swan neck or three-way pipe or threaded pipe or with the pipe of four jiaos or band hexagonal, or other steel tubing in different shapes.It is consistent with the interface shape of shape-memory pipe joint to weld parent tube, and the size correspondence links to each other with the electrostatic storage tube joint, and its material must guarantee to have weldability.The automatic weldering of attachment weld by argon shield, revolve arc-welding and form.Said reducing band can also be a concave ring groove, or the bulge loop platform, or shrinks sloping ring, or the sloping ring of expansion, in order to retrain around alleviation training hole enlargement and the answer undergauge, disturbs to prevent that the parent tube rigidity from producing the shape-memory behavior.
Combined marmem pipe working process of the present invention can be carried out according to the following steps: (1) parent tube is shaped: utilize the tube cavity oil pressure, by die forming, and form band sealing round end arm.(2) cutting interface: adopt cutter blade machinery to cut away arm sealing round end, form connection interface.(3) parent tube lead angle: use the lead angle lathe, cut out the outer lead angle of parent tube interface.(4) joint lead angle: utilize conical milling cutter, cut out lead angle in the shape-memory pipe joint end.(5) assembling chucking: utilize the lead angle conical surface to position assembling, pipe joint is plugged parent tube interface and chucking.(6) rotation protection: by the vertical axle of welding circular planes, rotational workpieces is also opened argon gas, carries out inert gas shielding, 10~25 rev/mins of workpiece rotational frequencies.(7) weldering of socializing entirely: control welding interval automatically, with the period of rotation coupling, reach full week welding, avoid weldering or stitch welding with Louing, revolving weldering voltage is 11~30V, revolves that to weld electric current be 110~240A.(8) roll extrusion ditch ring: utilize the axle mould of with groove, the outside is rolled into the reducing band.(9) annealing and pickling: be higher than austenite and reverse the annealing of change finishing temperature, through overpickling, phosphatization, saponification.(10) training reaming: adopt tapered punch, press the hole enlargement of pipe joint direction, withdraw from then.
The present invention possesses remarkable advantage, and combined marmem pipe adopts the integrated and preparation process composite structure of welding, has reduced the assembling of many parts, can save valuable shape-memory material, has simplified the parent tube structure simultaneously, has significantly reduced the overall cost of pipe fitting; Can simplify installation procedure, improve efficiency of construction; Owing to reduced engineering assembling tie point, improved the margin of safety that pipeline connects, make engineering construction more reliable; Utilize the reducing band to go deep into degree by the positioning control pipe in the structure, it is very convenient to construct; The baroque part forming of shape-memory is very difficult, and adopts welding composite structure of the present invention, has simplified technology, has improved the processed finished products rate.
For understanding technological scheme of the present invention better, below describe in further detail by drawings and Examples.
Fig. 1 is a combined marmem pipe structural representation of the present invention.
As shown in the figure, combined marmem pipe is made up of four parts: electrostatic storage tube joint 1, can weld parent tube 4, Attachment weld 3 and reducing band 2, electrostatic storage tube joint 1 with can weld parent tube 4 and link to each other by attachment weld 3, can Weldering parent tube 4 is corresponding with the interface of electrostatic storage tube joint 1, and both have solderability, near the memory attachment weld 3 On pipe joint 1 tube wall reducing band 2 is arranged.
Attachment weld 3 forms by tungsten electrode argon shield weldering, and reducing band 2 is used for alleviating training hole enlargement and answer Constraint around the undergauge prevents the parent tube rigidity to the interference of shape memory behavior generation, and electrostatic storage tube joint 1 adopts Shape-memory material is made, and can be the Nitinol memory material, or the acid bronze alloy memory material, or iron-based Shape memory alloy material etc.
Embodiment 1
External diameter of pipe is the shape-memory stainless steel composite pipe spare of Φ 20mm; can weld basepipe materials is OCr18Ni9Ti; its pipe thickness is 1mm; the stainless steel material trade mark that the shape-memory pipe joint adopts is OCr12Ni6Si5Mn16; pipe thickness is 1mm; with lead angle in the shape-memory pipe joint with can weld the location assembling of the outer lead angle of parent tube interface; rotational workpieces is also opened argon gas; carrying out inert gas shielding welds automatically; 25 rev/mins of workpiece rotational frequencies revolve weldering voltage 24V, revolve weldering electric current 110A; utilize the axle mould of with groove, at the outside roll extrusion reducing of pipe joint band.Annealing process is 600 ℃, 30min, 30 ° of tapered punch cone angles, hole enlargement distortion 8%.Combined pipe fitting obtains good weld seam.
Embodiment 2
External diameter of pipe is the shape-memory stainless steel composite pipe spare of Φ 25mm; its pipe thickness is 1mm; can weld basepipe materials and shape-memory pipe joint material with embodiment 1; utilize argon shield to weld automatically; 20 rev/mins of workpiece rotational frequencies; revolve weldering voltage 11V, revolve weldering electric current 197A, other process parameters are with embodiment 1.Combined pipe fitting obtains good weld seam.
Embodiment 3
External diameter of pipe is the shape-memory stainless steel composite pipe spare of Φ 32mm; its pipe thickness is 1.2mm; can weld basepipe materials and shape-memory pipe joint material with embodiment 1; utilize argon shield to weld automatically; 15 rev/mins of workpiece rotational frequencies; revolve weldering voltage 12V, revolve weldering electric current 220A, other process parameters are with embodiment 1.Combined pipe fitting obtains good weld seam.
Embodiment 4
External diameter of pipe is the shape-memory stainless steel composite pipe spare of Φ 50mm; its pipe thickness is 1.5mm; can weld basepipe materials and shape-memory pipe joint material with embodiment 1; utilize argon shield to weld automatically; 10 rev/mins of workpiece rotational frequencies; revolve weldering voltage 30V, revolve weldering electric current 120A, other process parameters are with embodiment 1.Combined pipe fitting obtains good weld seam.
The present invention is simple in structure, and is easily manufactured, use reliably, and beautiful shape, the pipeline that can be widely used in a plurality of fields such as oil, chemical industry, machinery, aviation, food, pharmacy, building connects.