CN107876578A - A kind of production method of rectangular tube - Google Patents
A kind of production method of rectangular tube Download PDFInfo
- Publication number
- CN107876578A CN107876578A CN201711165990.4A CN201711165990A CN107876578A CN 107876578 A CN107876578 A CN 107876578A CN 201711165990 A CN201711165990 A CN 201711165990A CN 107876578 A CN107876578 A CN 107876578A
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- Prior art keywords
- rectangular tube
- tube blank
- production method
- blank
- finished product
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/15—Making tubes of special shape; Making tube fittings
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Extraction Processes (AREA)
Abstract
The invention provides a kind of production method of rectangular tube, including step 1) to be squeezed into circular tube blank by ingot casting, makes the wall thickness dimension tolerance of circular tube blank in pre-set tolerance frame；2) the rectangular tube blank by circular tube blank shaping drawing for preset shape；3) rectangular tube blank is cleaned；4) finished products are carried out to rectangular tube blank；5) tension straingtening is carried out to rectangular tube blank；6) it is rectangular tube finished product by the sawing of rectangular tube blank.The production method of the present invention eliminates circular tube blank of two passages with core print drawings, three times annealing operation, the directly wall thickness such as extruding, so as to shorten technological process, and then improves production efficiency, while reduce energy consumption.Meanwhile aforementioned production method reduces by two passage drawings, can at least reduce the long geometry waste materials of 600mm, it can not only largely save the energy, shorten man-hour, moreover it is possible to effectively improve yield rate.
Description
Technical field
The present invention relates to rectangular tube production technical field, more specifically to a kind of production method of rectangular tube.
Background technology
LF6M rectangle thicknesss of pipe wall are relatively thin, and precision is higher, are mainly used in assembling launcher, market demand is larger.Due to LF6
Alloy, belong to high magnesium alloy, plasticity is poor, shapes difficulty.The production method that prior art is taken is：Circular tube blank extrudes
→ woollen annealing → the first passage of band core print drawing → woollen annealing → the second passage of band core print drawing → woollen annealing → shaping
Drawing → cleaning → finished products → tension straingtening → sawing → inspection, delivery.
In aforementioned production method, tubing must through annealing repeatedly, multi pass drawing, and during drawing also easily produce jump ring and
The defects of sticking to mould, production process is more, technological process is longer, and energy consumption is higher, production efficiency and yield rate are relatively low, protects supplying face on time
Face larger pressure.
In addition, when pipe drawing is rectangular, flow of metal is uneven, easily concave defect in generation.
In summary, shortening technological process how is realized, to improve production efficiency, while reduces energy consumption, is current ability
Field technique personnel technical problem urgently to be resolved hurrily.
The content of the invention
In view of this, it is an object of the invention to provide a kind of production method of rectangular tube, to shorten technological process, and then
Production efficiency is improved, while reduces energy consumption.
In order to achieve the above object, the present invention provides following technical scheme：
A kind of production method of rectangular tube, including step：
1) ingot casting is squeezed into circular tube blank, makes the wall thickness dimension tolerance of the circular tube blank in pre-set tolerance frame；
2) the rectangular tube blank by circular tube blank shaping drawing for preset shape；
3) the rectangular tube blank is cleaned；
4) finished products are carried out to the rectangular tube blank；
5) tension straingtening is carried out to the rectangular tube blank；
6) it is rectangular tube finished product by the rectangular tube blank sawing.
Preferably, in aforementioned production method, length-width ratio≤2 of the rectangular tube finished product, wall thickness 3-5mm is described default
The margin of tolerance is ± 0.4mm.
Preferably, in aforementioned production method, the step 1) is extruded by 2500 tons of hydraulic presses.
Preferably, in aforementioned production method, the nib hole wall of stretching die is equal used by shaping drawing in the step 2)
It is recessed to the direction away from nib axis.
Preferably, in aforementioned production method, the nib hole wall is the arcwall face being gradually recessed from both ends to middle part.
Preferably, in aforementioned production method, the rectangular tube finished product is rectangle pipe, the long A1=A+KB of the nib,
Wide B1=B+KA；
In formula：K is coefficient, and value 1.0%-2.0%, A are the length of the rectangle pipe, and B is the width of the rectangle pipe.
Preferably, in aforementioned production method, the hole wall of the approach cone of the stretching die is by four segmental arcs of shape identical
Surround, the segmental arc includes two arc sections positioned at both ends and the gentle segmental arc positioned at middle part, the gentle arc
Section transition connects two arc sections.
Preferably, in aforementioned production method, in addition to step：7) the rectangular tube finished product is tested, delivered goods.
It can be seen from the above technical scheme that the production method of rectangular tube provided by the invention includes step 1) by ingot casting
Circular tube blank is squeezed into, makes the wall thickness dimension tolerance of circular tube blank in pre-set tolerance frame；2) circular tube blank is shaped into drawing
For the rectangular tube blank of preset shape；3) rectangular tube blank is cleaned；4) finished product is carried out to rectangular tube blank to move back
Fire；5) tension straingtening is carried out to rectangular tube blank；6) it is rectangular tube finished product by the sawing of rectangular tube blank.
The production method of the present invention eliminates two passage band core print drawings, three times annealing operation, the directly wall thickness such as extruding
Circular tube blank, so as to shorten technological process, and then improve production efficiency, while reduce energy consumption.
, can not only be a large amount of meanwhile aforementioned production method reduces by two passage drawings, can at least reduce the long geometry waste materials of 600mm
Save the energy, shorten man-hour, moreover it is possible to effectively improve yield rate, product quality and mechanical property meet GBn221-84 requirements, full
Sufficient market and national military project demand.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are the present invention
Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
These accompanying drawings obtain other accompanying drawings.
Fig. 1 is the schematic flow sheet of the production method of rectangular tube provided in an embodiment of the present invention；
Fig. 2 is the appearance schematic diagram of rectangular tube provided in an embodiment of the present invention；
Fig. 3 is that the appearance schematic diagram of indent occurs for the rectangular tube of prior art production；
Fig. 4 is the appearance schematic diagram of stretching die provided in an embodiment of the present invention；
Fig. 5 is the schematic diagram of the stretching die drawing forming rectangular tube of the embodiment of the present invention；
Fig. 6 is the appearance schematic diagram of the approach cone of stretching die used in rectangular tube provided in an embodiment of the present invention.
Embodiment
The embodiments of the invention provide a kind of production method of rectangular tube, technological process is shortened, and then improves production
Efficiency, while reduce energy consumption.
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
Accompanying drawing 1 is refer to, the production method of rectangular tube provided in an embodiment of the present invention includes step：
S1, circular tube blank extruding：Ingot casting is squeezed into circular tube blank, makes the wall thickness dimension tolerance of circular tube blank in default public affairs
In poor scope；
S2, shaping drawing：By the rectangular tube blank 2 that circular tube blank shaping drawing is preset shape；
S3, cleaning：Rectangular tube blank 2 is cleaned；
S4, finished products：Finished products are carried out to rectangular tube blank 2；
S5, tension straingtening：Tension straingtening is carried out to rectangular tube blank 2；
S6, sawing：It is rectangular tube finished product by the sawing of rectangular tube blank 2.
The production method of the present invention eliminates two passage band core print drawings, three times annealing operation, the directly wall thickness such as extruding
Circular tube blank, so as to shorten technological process, and then improve production efficiency, while reduce energy consumption.
, can not only be a large amount of meanwhile aforementioned production method reduces by two passage drawings, can at least reduce the long geometry waste materials of 600mm
Save the energy, shorten man-hour, moreover it is possible to effectively improve yield rate, product quality and mechanical property meet GBn221-84 requirements, full
Sufficient market and national military project demand.
Preferably, length-width ratio≤2 of rectangular tube finished product, wall thickness 3-5mm, pre-set tolerance frame are ± 0.4mm.The present invention
Production method can preferably adapt to the production of the relatively thin rectangular tube of length-width ratio≤2, wall thickness.
In further technical scheme, aforementioned production method also includes step S7：Rectangular tube finished product is tested, handed over
Goods；Certainly, the present invention will can also examine, delivery step is placed on other processes and completed.
In above-described embodiment, step S1 is extruded by 2500 tons of hydraulic presses.In specific embodiment, rectangle thickness of pipe wall is
5.0mm, 2500 tons of hydraulic presses can strictly control the extruding quality of circular tube blank when extruding, control circular tube blank wall thickness dimension exists
In the range of 5.0 ± 0.4mm and surface quality (circular tube blank is not allow for the defects of peeling, scuffing, fish scale-shaped).It is appreciated that
It is that the present invention can also use other mechanisms that can complete circular tube blank extruding.
By taking 100 × 60 × 5.0LF6M rectangular tubes as an example, optimization anterior-posterior approach contrast.
Existing production method before optimization is：Pipe woollen (Φ 99 × 5.5 of Φ 110/) → woollen annealing → band core print drawing
First passage (Φ 95 × 5.3 of Φ 105.3/) → woollen annealing → second passage of band core print drawing (Φ 92 × 5.0 of Φ 102/) →
Woollen is annealed → shaped drawing (circle drawing side) → cleaning → finished products → tension straingtening → sawing → inspection, delivery.
Production method after optimization is specially：Pipe woollen (Φ 103 × 5.0) → shaping drawing (circle drawing side) → cleaning → into
Product annealing → tension straingtening → sawing → inspection, delivery.
Table 1 below contrasts for the production method of LF6M rectangular tubes.
The production method contrast of the LF6M rectangular tubes of table 1
Energy-conservation measuring and calculating：12T annealing furnaces average energy consumption is 181KWh/ tons, and drawbench average energy consumption is 21KWh/ tons, and process is excellent
After change, annealing and twice sub-band core print drawing three times are saved, producing rectangular tube per ton can at least economize on electricity：181 × 3+21 × 2=
585KWh。
The appearance and size of general rectangular tube represents that method is：Long (A) × wide (B) × wall thickness, as shown in Figure 2.
Because aluminum pipe stretching belongs to cold working, without phenomenon of expanding with heat and contract with cold, the nib of existing stretching die be all in strict accordance with
Finished product rectangular tube designs, i.e. the appearance and size of finished product is exactly the appearance and size of stretching die nib.But in stretching production, due to
The inhomogeneities of metal flow, tend to stretch out rear rectangular tube and indent phenomenon just occurs, occur among longer wide-edge and collapse inward
Phenomenon (as shown in Figure 3).The plane clearance that this results in rectangular tube is overproof, and appearance and size is unqualified.
A large amount of rectangular tube stretcher strain anteroposterior dimension delta datas discoveries are arranged by collecting：
A=A-KB；B=B-KA；In formula：K- empirical coefficients, generally 1.0%-2.0%.
The nib hole wall of stretching die 1 used by drawing is shaped in preferable technical scheme, in above-mentioned steps S2 to remote
Direction from nib axis is recessed.By the present invention in that nib has suitable predeformation amount, nib is designed to evagination rectangle,
As shown in figure 4, so as to compensate drawing sunken inside amount, make the rectangular pipe of circular tube blank direct drawing, as shown in figure 5, further carrying
High yield rate.
In specific embodiment of the present invention, nib hole wall is the arcwall face being gradually recessed from both ends to middle part.Certainly, on
Stating four nib hole wall structures can also differ.
In order to further optimize above-mentioned technical proposal, rectangular tube finished product is rectangle pipe, the long A1=A+KB of nib, wide B1
=B+KA；In formula：K is coefficient, and value 1.0%-2.0%, A are the length of rectangle pipe, and B is the width of rectangle pipe.Above-mentioned size
The bulge quantity of nib can preferably be ensured, better compensate for drawing sunken inside amount.Certainly, the present invention can also be by repeatedly trying
Test and obtain nib specifically length and width.
For the situation that rectangular tube is positive square tube, the present invention optimizes design, stretching die 1 to the approach cone 3 of drawing die
The hole wall of approach cone 3 surrounded by four segmental arcs of shape identical, segmental arc include positioned at both ends two arc sections and
Gentle segmental arc positioned at middle part, gentle segmental arc transition connect two arc sections.The approach cone 3 of the present invention is formed positioned at circle
And it is square between intermediate shape, as shown in Figure 6.
The present invention tests three kinds of form approach cones of square, circular and of the invention intermediate shape drum respectively for positive square tube
3 drawing die, as a result find that the drawing die of the approach cone 3 of the present invention most can guarantee that the plane clearance of square tube, further increase
Drawing quality.
By the implementation of above-mentioned measure, the production cycle of LF6M rectangular tubes significantly shortens, and yield rate significantly improves, and upgrading increases
Effect is notable.LF6M rectangular tubes production technology and die design method have been generalized in the rectangular tube production of other alloys.
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.
The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or using the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
Claims (8)
1. a kind of production method of rectangular tube, it is characterised in that including step：
1) ingot casting is squeezed into circular tube blank, makes the wall thickness dimension tolerance of the circular tube blank in pre-set tolerance frame；
2) the rectangular tube blank (2) by circular tube blank shaping drawing for preset shape；
3) the rectangular tube blank (2) is cleaned；
4) finished products are carried out to the rectangular tube blank (2)；
5) tension straingtening is carried out to the rectangular tube blank (2)；
6) it is rectangular tube finished product by rectangular tube blank (2) sawing.
2. production method according to claim 1, it is characterised in that length-width ratio≤2 of the rectangular tube finished product, wall thickness are
3-5mm, the pre-set tolerance frame are ± 0.4mm.
3. production method according to claim 1, it is characterised in that the step 1) is extruded by 2500 tons of hydraulic presses.
4. production method according to claim 1, it is characterised in that stretched in the step 2) used by shaping drawing
The nib hole wall of mould (1) is recessed to the direction away from nib axis.
5. production method according to claim 4, it is characterised in that the nib hole wall is gradual from both ends to middle part
The arcwall face of depression.
6. production method according to claim 5, it is characterised in that the rectangular tube finished product is rectangle pipe, the mould
The long A1=A+KB in hole, wide B1=B+KA；
In formula：K is coefficient, and value 1.0%-2.0%, A are the length of the rectangle pipe, and B is the width of the rectangle pipe.
7. production method according to claim 5, it is characterised in that the hole wall of the approach cone (3) of the stretching die (1) by
Four segmental arcs of shape identical surround, and the segmental arc is included positioned at two arc sections at both ends and positioned at the gentle of middle part
Segmental arc, the gentle segmental arc transition connect two arc sections.
8. according to the production method described in claim any one of 1-7, it is characterised in that also including step：
7) the rectangular tube finished product is tested, delivered goods.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711165990.4A CN107876578A (en) | 2017-11-21 | 2017-11-21 | A kind of production method of rectangular tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711165990.4A CN107876578A (en) | 2017-11-21 | 2017-11-21 | A kind of production method of rectangular tube |
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| Publication Number | Publication Date |
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| CN107876578A true CN107876578A (en) | 2018-04-06 |
Family
ID=61778335
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|---|---|---|---|
| CN201711165990.4A Pending CN107876578A (en) | 2017-11-21 | 2017-11-21 | A kind of production method of rectangular tube |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110778803A (en) * | 2019-10-30 | 2020-02-11 | 西安圣泰金属材料有限公司 | Thin-wall high-precision titanium alloy seamless square and rectangular pipe and manufacturing method and application thereof |
| CN113690705A (en) * | 2021-08-25 | 2021-11-23 | 苏州鸿康未徕智能科技有限公司 | Production process of high-precision USB TYPE-C shell |
| CN113976661A (en) * | 2021-10-31 | 2022-01-28 | 湖南中创空天新材料股份有限公司 | Production process of aluminum alloy special-shaped seamless pipe |
| CN114472583A (en) * | 2022-03-11 | 2022-05-13 | 湖南中创空天新材料股份有限公司 | Processing method of special-shaped reducing thin-wall seamless aluminum pipe with two closed ends at two ends |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110778803A (en) * | 2019-10-30 | 2020-02-11 | 西安圣泰金属材料有限公司 | Thin-wall high-precision titanium alloy seamless square and rectangular pipe and manufacturing method and application thereof |
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| CN113976661A (en) * | 2021-10-31 | 2022-01-28 | 湖南中创空天新材料股份有限公司 | Production process of aluminum alloy special-shaped seamless pipe |
| CN114472583A (en) * | 2022-03-11 | 2022-05-13 | 湖南中创空天新材料股份有限公司 | Processing method of special-shaped reducing thin-wall seamless aluminum pipe with two closed ends at two ends |
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