CN1159119C - Weight process of drawing and straightening hot extruded shapes - Google Patents
Weight process of drawing and straightening hot extruded shapes Download PDFInfo
- Publication number
- CN1159119C CN1159119C CNB021022119A CN02102211A CN1159119C CN 1159119 C CN1159119 C CN 1159119C CN B021022119 A CNB021022119 A CN B021022119A CN 02102211 A CN02102211 A CN 02102211A CN 1159119 C CN1159119 C CN 1159119C
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- weight
- section bar
- aligning
- extruded
- straightening
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Abstract
The present invention relates to a method for straightening a hot extrusion profile. The method is mainly used for straightening hot extrusion profiles made of magnesium alloy, greatly enhances dimensional precision of the hot extrusion profiles made of magnesium alloy and greatly lowers other defects; the method can enhance the rate of finished products when used for producing profiles made of aluminium copper alloy. In the method, a weight dropper is directly connected with an extruded profile via a traction rope, a clamp, etc. to provide pulling force for the extrusion profile, and the hot extrusion profile can be straightened. The present invention can enhance the reliability and the automation degree of straightening operation via a series of devices.
Description
Technical field:
What the present invention relates to is a kind of traction of hot extruded shapes, the method for aligning.Relate in particular to the production that is used for the magnesium alloy hot extruded shapes, also can be used for the production of copper section bar, aluminium section bar.The technical field that belongs to material finishing, aligning in the material preparation.
Background technology:
Remarkable advantage such as magnesium alloy has that proportion is low, specific strength and specific stiffness height and the prices of raw and semifnished materials are low.The proportion of magnesium is about 2/3rds of aluminium, that is to say with magnesium and aluminium to produce the product of same model, specification, alleviates 1/3rd with magnesium than with aluminium by weight; By product yield, the output of magnesium goods is 150% of aluminum products.At present, the cost of producing magnesium metal per ton has been lower than the production cost of aluminium.The mechanical strength of most of magnesium alloy profiles is than the intensity height of 6063 aluminum alloy building sections.So make the promise well of building doors and windows section bar with the magnesium alloy hot extruded shapes.
In existing technology, the production of hot extruded shapes and aligning carry out in two steps, are the separate operations of twice, and Mr. aligns postpartum.Aluminium section bar, copper section bar can be aligned with the hyperboloid multi-roll straightening machine, forming roll straightener aligning, tension flattening machine aligning.In existing section bar extruding was produced, the large-tonnage extruder was typically equipped with draw-gear, but this device only draws usefulness, and the speed of traction and tractive force are certain.Magnesium alloy hot extrusion profile shapes at room temperature cannot or be difficult in order to last method aligning.
Summary of the invention:
The object of the present invention is to provide a kind of finishing of magnesium alloy hot extruded shapes, the method for aligning, this method is finished the production of hot extruded shapes and aligning synchronously, has greatly improved labor productivity; Can make the hot extrusion magnesium alloy profiles flexibility, angle, turn round defectives such as stubborn degree, plane clearance, curve clearance and eliminated; The cross sectional dimensions precision is improved a lot.
Magnesium alloy profiles at room temperature plasticity is low, and plasticity just significantly improves when having only temperature to surpass 225 ℃.If align again after the extruding of magnesium section bar is finished, between the two-step certain time interval must be arranged, in the middle of this, thin-walled magnesium section bar is cooled to room temperature substantially, can't align with existing tensammetry.According to the technological requirement of magnesium alloy profiles extruding, the heating-up temperature of magnesium rod generally will surpass 250 ℃, and section bar is extruded the moment of mould mouth, is temperature the highest the time, and at this moment temperature generally all surpasses 250 ℃.
For realizing the purpose of magnesium alloy hot extruded shapes aligning, the invention provides a kind of method.After section bar is extruded the mould sufficient length for the first time, stop extruding, the rope tool that links to each other with weight by anchor clamps be extruded section bar and link to each other, at this moment weight is just given and is extruded pulling force of section bar, if the pulling force size to fit is started extruder again, then section bar is aligned when being extruded.After first ear of maize squeezed, sawed-off and remove extrusion profile, weight is linked to each other once more with section bar.At this moment extruder has installed second magnesium rod, and start has also been squeezed second magnesium rod.And the like, extruder just can enter program, produces automatically under the control of PLC.Use the weight process of drawing straightening hot extruded shapes, by regulating weight weight, the extruded product that weight can be each description provides the straightening force an of the best; In an extrusion cycle process, extrusion speed all can provide an almost constant constant straightening force from maximum this device of zero track.
The specific embodiment:
Determining of weight weight.The weight of weight method or two kinds of methods of computing method is by experiment determined.Also can first rough calculation go out used weight weight, method adjustment by experiment again.Weight weight=section material section area multiply by the yield strength of section bar under the temperature that is extruded mould mouth place.Weight weight generally should be lower than institute's calculated weight, so that section bar was aligned under maximum temperature in the moment that is extruded mould, no longer is elongated after section bar is aligned, and temperature no longer is elongated after reducing.If having defective, extrusion profile can not be elongated.Might elongate section bar if weight is overweight, the profile size precision is reduced.The concrete computational methods of weight weight can also be with reference to the computational methods of power dispositions such as cold drawn wire, copper wire, aluminium wire.
The steel wire rope that links to each other with weight can link to each other with section bar by anchor clamps.For preventing that the anchor clamps irregular movement from driving the section bar shake.Anchor clamps can be fixed on the dolly, steel wire rope can directly affect dolly, with a side or the top of cart stationary in existing cold bed.Dolly is light as much as possible, operate steadily, activity freely.When trolley travelling to away from the extruder end, an ear of maize has squeezed, when an ear of maize is forced down in the extruder preparation, can decontrol anchor clamps, sawed-off section bar is removed cold bed with section bar, and dolly is returned to the extruder end, mentions weight, and weight is linked to each other with next root section bar.Dolly is returned to the extruder end can several different methods, can use manually, uses hoist engine, uses screw rod, uses chain, use linear electric motors, variable speed electric motors, particularly etc.Dolly returns to the extruder end, when anchor clamps with after section bar closely links to each other, begin next circulation before, dolly should leave with the clutch of carriage return device.So that all wt of weight is passed to section bar, in order to avoid because mechanical loss makes straightening force suddenly big or suddenly small.Dolly will have speed-limiting device, if the dolly pace then may be that section bar is broken greater than the maximum extruded velocity of extruder, accident occurs, and at this moment dolly just should stop immediately, in case have an accident.Weight should adopt well formula, tower, assembly pulley formula, or with in the hoist engine steel wire rope directly several different methods such as string one weight etc. hang.Weight should be equipped with plurality of specifications so that regulate weight.The moment that weight lands, should squeeze an ear of maize simultaneously with extruder.Can reach by the steel wire rope length of regulating between weight and the dolly.Earlier normally squeezed an ear of maize, seen where dolly is parked in, so that regulate the distance between dolly and the weight.Should add buffer unit between weight and the ground, to reduce the inertia of weight; Or make extruder pass through progressively to reduce the extrusion speed parking.In order to avoid stop suddenly when having squeezed an ear of maize, because inertia strengthens tractive force suddenly, the section bar of extrusion is elongated, attenuate, so that the profile size precision is reduced.
If extruder is to push solid article with flat-die, should before mould, add a cup mould (claiming guiding mould or protection mould again).In order to avoid break extruded product, have an accident.If think further to improve the section bar precision, can behind mould, add a guiding (also claiming stock mould), can be forced cooling to the section bar in guiding with air, water.
Compare with common tensammetry, the used pulling force of weight method only is 1/tens of a tensammetry, only in the moment that section bar is extruded the mould mouth defective part is aligned, and do not resemble the stretcher leveling method whole section bar is not all elongated.Chuck waste material amount is little, only more than ten centimetre.Can improve lumber recovery significantly.
Claims (3)
1, a kind of aligning force method of hot extrusion magnesium alloy profiles, it is to use the rope tool, the anchor clamps that link to each other with weight directly to be connected to be extruded section bar, for it provides a suitable pulling force, be extruded section bar with aligning, it is characterized in that: the production of hot extruded shapes is finished synchronously with aligning, aligning is only finished in maximum temperature following moment that section bar is extruded the mould mouth, and this moment, temperature generally surpassed 250 ℃ of degree.
2, the method for aligning of the hot extruded shapes of claim 1 is characterized in that: according to extrusion process, the section bar that weight can be each description provides a suitable pulling force.
3, the method for aligning of the hot extruded shapes of claim 1 is characterized in that: in extrusion process, extrusion speed is from zero to maximum, and the pulling force that weight provides is almost invariable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021022119A CN1159119C (en) | 2002-01-01 | 2002-01-01 | Weight process of drawing and straightening hot extruded shapes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021022119A CN1159119C (en) | 2002-01-01 | 2002-01-01 | Weight process of drawing and straightening hot extruded shapes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1362298A CN1362298A (en) | 2002-08-07 |
| CN1159119C true CN1159119C (en) | 2004-07-28 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021022119A Expired - Fee Related CN1159119C (en) | 2002-01-01 | 2002-01-01 | Weight process of drawing and straightening hot extruded shapes |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1159119C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102014004329A1 (en) * | 2014-03-26 | 2015-10-01 | Ulrich Bruhnke | Method and device for processing extruded sections of magnesium or magnesium alloys and a lightweight component made therefrom |
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2002
- 2002-01-01 CN CNB021022119A patent/CN1159119C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1362298A (en) | 2002-08-07 |
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