CN104498692B - A kind of cold drawing steel tube core and preparation method thereof - Google Patents
A kind of cold drawing steel tube core and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a kind of cold drawing steel tube core, its diameter is 10-70mm, and length is 50-80mm, and surface recombination has the ceramic membrane of promising 5-15 μm of thickness.The invention also discloses the method preparing described cold drawing steel tube core, including: 1) choose pending core；2) high temperature quenching, high tempering process step 1) core；3) TDS process: first cleaning step 2) core, then core is placed in 400-600 DEG C process 30-60 minute, then in 900-1100 DEG C of salt bath, process 5-15h, and then being added by core in 600-800 DEG C of salt bath and carry out isothermal hardening air cooling to room temperature, last 480-540 DEG C of temper also polishes to obtain finished product.Cold drawing steel tube core surface hardness HV > 2800 obtained by the present invention, and compact structure, have occlusion performance between good tension wound, anti-metal, can be improved 5-15 times the service life of core.
Description
Technical field
The invention belongs to metal drawing forming field, relate to Tube Drawing mould, particularly to a kind of cold drawing steel tube core and preparation method thereof.
Background technology
Cold-drawn is a kind of common metal working process, is widely applied in producing seamless steel pipe, and the intensity of cold drawing die, toughness, abrasion resistance properties, decay resistance, coefficient of friction, fatigue behaviour are all had significantly high requirement by Tube Drawing.Cold drawing die generally includes die sleeve and core rod, core rod is placed in die sleeve, during work, outer surface produces power friction (stress on calibrating strap can up to nearly 3000Mpa) with steel pipe inner wall, and common core is not up to standard because of intensity, hardness, toughness, not only service life is short, and uncontrollable pipe diameter, it is impossible to ensure pipe material inner wall quality；It addition, in the process of drawing, steel pipe inner wall can produce strong plastic deformation, making die temperature be increased to 300 DEG C, this just requires that core material has certain temper resistance.For this, part producer adopts the heat treatment methods such as Q-tempering+chrome-faced to process to improve core anti-wear performance, but the hardness of this method and wearability are all not high enough, it is impossible to meet product instructions for use, and when particularly producing high tensile steel tube, contradiction is especially prominent.
Therefore, it is necessary to provide a kind of core that can improve core wearability and plasticity and toughness energy to process technique simultaneously.
Summary of the invention
In view of this, it is an object of the invention to provide a kind of cold drawing steel tube core and preparation method thereof.
For reaching above-mentioned purpose, the present invention provides following technical scheme:
The carbide composite ceramics rete that a kind of cold drawing steel tube core, particularly outer surface have thickness to be 5-15 μm.
Preferably, described cold drawing steel tube core is column type core, and its its diameter is 10-70mm, and length is 50-80mm.
The method preparing cold drawing steel tube core, comprises the following steps:
1) sampling: choose pending cold drawing steel tube core；
2) heat treatment: first high temperature Quenching Treatment institute coring mould, then carries out high tempering process；
3) TD process, including:
I, cleaning: clean and remove mandrel surface greasy dirt and rusty stain；
Ii, preheating: i gained core is placed in 400-600 DEG C of environment and is incubated 30-60 minute；
Iii, salt bath process: added by the core of ii in 900-1100 DEG C of salt bath and process 5-15h；
Iv, isothermal hardening: the core of iii added in 600-800 DEG C of salt bath and carry out isothermal hardening, then air cooling is to room temperature；
V, tempering: 480-540 DEG C of temper iv gained core；
Vi, polishing: polishing is removed the loose adhesive layer of v gained mandrel surface and obtained product.
Preferably, step 2) TD also includes the step of polish cold drawing steel tube core before processing after heat treatment.
Preferably, step 1) taken cold-drawing steel tube core membrane material is Cr12Mo1V1。
Preferably, step 3) salt bath processes salt bath used and contains following composition by mass: Borax 70-80 part, BaCl22-5 part, V2O55-12 part, Al2-6 part, Mg1-5 part.
The beneficial effects of the present invention is: the cold drawing steel tube core outer surface of the present invention has high rigidity, high intensity, advantage wear-resistant, erosion-resisting, it is possible to be greatly improved the service life of core.The composite ceramic film that cold drawing steel tube core outer surface obtained by the present invention has thickness to be 5-15 μm, this ceramic membrane has compact structure, hardness is high, occlusion between tension wound, anti-metal, the advantage that performance is good, it is possible to the service life of core improves 5-15 times and reduces its production cost.
Accompanying drawing explanation
In order to make the purpose of the present invention, technical scheme and beneficial effect clearly, the present invention provides drawings described below to illustrate:
Fig. 1 is cold drawing steel tube core material object photo after the embodiment of the present invention 1 processes；
Fig. 2 is the pattern photo in kind of cold drawing steel tube core after the embodiment of the present invention 2 processes；
Fig. 3 is the Metallograph of cold drawing steel tube core after embodiment 1 processes.
Detailed description of the invention
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail.
Open a kind of cold drawing steel tube core, particularly outer surface are compounded with the carbide composite ceramic film that thickness is 5-15 μm by following example.
Preferably, described cold drawing steel tube core is column type core, and its diameter is 10-70mm, and length is 50-80mm, and material is Cr12Mo1V1。
Embodiment 1:
The present embodiment prepares the method for described cold drawing steel tube core, comprises the following steps:
1) sampling: choose Cr12Mo1V1Raw material preliminary working obtain core semi-finished product；
2) heat treatment: first high temperature quenching (hardening heat is 1020 DEG C, and hardening media is liquid nitrogen) processes step 1) gained core, then carry out high tempering process (temperature is 520 DEG C, and medium is air)；
3) machining: polish processes step 2) gained core；
4) TD process, including:
I, cleaning: clean removal step 3) gained mandrel surface greasy dirt and rusty stain；
Ii, preheating: i gained core is placed in 500 DEG C of environment and is incubated 45 minutes；
Iii, salt bath process: added by the core of ii in 950 DEG C of salt baths and process 10h；
Iv, isothermal hardening: the core of iii added in 750 DEG C of salt baths and carry out isothermal hardening, then air cooling is to room temperature；
Used by this step, salt bath is mainly composed of KCl and NaCl.
V, tempering: 510 DEG C of temper iv gained cores；
Vi, polishing: polishing is removed the loose adhesive layer of v gained mandrel surface and obtained product.
In the present embodiment, step 4) salt bath processes salt bath used and contains following composition by mass: Borax 75 parts, BaCl26 parts, V2O58 parts, Al5 part, Mg3 part.
Embodiment 2:
The present embodiment prepares the method for described cold drawing steel tube core, comprises the following steps:
1) sampling: choose Cr12Mo1V1Raw material preliminary working obtain core semi-finished product；
2) heat treatment: first high temperature quenching (hardening heat is 1080 DEG C of quenchings, and medium is liquid nitrogen) processes step 1) gained core, then carry out high tempering process (temperature is 540 DEG C, and medium is air)；
3) machining: polish processes step 2) gained core；
4) TD process, including:
I, cleaning: clean removal step 3) gained mandrel surface greasy dirt and rusty stain；
Ii, preheating: i gained core is placed in 600 DEG C of environment and is incubated 30 minutes；
Iii, salt bath process: added by the core of ii in 1000 DEG C of salt baths and process 5h；
Iv, isothermal hardening: the core of iii added in 720 DEG C of salt baths and carry out isothermal hardening, then air cooling is to room temperature；
V, tempering: 500 DEG C of temper iv gained cores；
Vi, polishing: polishing is removed the loose adhesive layer of v gained mandrel surface and obtained product.
In the present embodiment, step 4) salt bath processes salt bath used and contains following composition by mass: Borax 80 parts, BaCl22 parts, V2O512 parts, Al2 part, Mg1 part.
Embodiment 3:
The present embodiment prepares the method for described cold drawing steel tube core, comprises the following steps:
1) sampling: choose Cr12Mo1V1Raw material preliminary working obtain core semi-finished product；
2) heat treatment: first high temperature quenching (hardening heat is 1050 DEG C, and hardening media is liquid nitrogen) processes step 1) gained core, then carry out high tempering process (temperature is 520 DEG C, and medium is air)；
3) machining: polish processes step 2) gained core；
4) TD process, including:
I, cleaning: clean removal step 3) gained mandrel surface greasy dirt and rusty stain；
Ii, preheating: i gained core is placed in 400 DEG C of environment and is incubated 60 minutes；
Iii, salt bath process: added by the core of ii in 900 DEG C of salt baths and process 15h；
Iv, isothermal hardening: the core of iii added in 700 DEG C of salt baths and carry out isothermal hardening, then air cooling is to room temperature；
V, tempering: 520 DEG C of temper iv gained cores；
Vi, polishing: polishing is removed the loose adhesive layer of v gained mandrel surface and obtained product.
In the present embodiment, step 4) salt bath processes salt bath used and contains following composition by mass: Borax 70 parts, BaCl26 parts, V2O55 parts, Al6 part, Mg3 part.
Performance test:
1, macro morphology detection: Fig. 1,2 respectively embodiment 1,2 process after the overall pattern photo of cold drawing steel tube core, it can be seen that the present embodiment cold drawing steel tube core surface compact light.
2, microscopic structure detection: Fig. 3 is the Metallograph of cold drawing steel tube core after embodiment 1 processes, it can be seen that Cr after the present embodiment process12Mo1V1Substrate surface is compounded with the carbide composite ceramic film that thickness is 5-15 μm, this ceramic membrane and matrix metallurgical binding, has high wear-resisting, bite-resistant (bonding), the performance such as anti-corrosion, mold use life-span can be significantly increased.
3, chemical composition detection: after testing, main square by vanadium carbide, niobium carbide, aluminium carbide etc. and the hexagonal crystal system Carbide Phases of embodiment 1 cold drawing steel tube core surface ceramic film is composited.
4, Mechanics Performance Testing: after testing, embodiment 1 cold drawing steel tube core case hardness HV > 2800, compared with process for treating surface several with following table, its hardness number is in high level, is fully able to the hardness requirement meeting cold drawing steel tube core.
The cold drawing steel tube core outer surface of the present invention has high rigidity, high intensity, advantage wear-resistant, erosion-resisting, it is possible to be greatly improved the service life of core.The composite ceramic film that cold drawing steel tube core outer surface obtained by the present invention has thickness to be 5-15 μm, this ceramic membrane has compact structure, hardness is high, occlusion between tension wound, anti-metal, the advantage that performance is good, it is possible to the service life of core improves 5-15 times and reduces its production cost.
What finally illustrate is, preferred embodiment above is only in order to illustrate technical scheme and unrestricted, although the present invention being described in detail by above preferred embodiment, but skilled artisan would appreciate that, in the form and details it can be made various change, without departing from claims of the present invention limited range.
Claims (4)
1. the method preparing cold drawing steel tube core, it is characterised in that described cold drawing steel tube core is column type core, its diameter is 10-70mm, and length is 50-80mm, and outer surface is compounded with the ceramic membrane that thickness is 5-15 μm；Preparation method comprises the following steps:
1) sampling: choose pending cold drawing steel tube core；
2) heat treatment: first high temperature Quenching Treatment institute coring mould, then carries out high tempering process；
3) TD process, including:
I, cleaning: clean and remove mandrel surface greasy dirt and rusty stain；
Ii, preheating: i gained core is placed in 400-600 DEG C of environment and is incubated 30-60 minute；
Iii, salt bath process: added by the core of ii in 900-1100 DEG C of salt bath and process 5-15h；
Iv, isothermal hardening: the core of iii added in 600-800 DEG C of salt bath and carry out isothermal hardening, then air cooling is to room temperature；
V, tempering: 480-540 DEG C of temper iv gained core；
Vi, polishing: polishing is removed the loose adhesive layer of v gained mandrel surface and obtained product.
2. the method preparing cold drawing steel tube core according to claim 1, it is characterised in that: step 2) TD also includes the step of polish cold drawing steel tube core before processing after heat treatment.
3. the method preparing cold drawing steel tube core according to claim 1, it is characterised in that: the taken cold-drawing steel tube core membrane material of step 1) is Cr12Mo1V1。
4. the method preparing cold drawing steel tube core according to claim 1, it is characterised in that step 3) salt bath processes salt bath used and contains following composition by mass: Borax 70-80 part, BaCl22-5 part, V2O55-12 part, Al2-6 part, Mg1-5 part.
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| CN106011392A (en) * | 2016-06-29 | 2016-10-12 | 宜兴市鑫源辊业有限公司 | Method for surface quenching of Cr12 material |
| CN106695262B (en) * | 2017-01-21 | 2019-01-22 | 浙江源端网络科技有限公司 | A kind of battery of mobile phone welding fixture processing method |
| CN113699343B (en) * | 2021-07-30 | 2022-09-09 | 江苏华程工业制管股份有限公司 | Heat treatment method for bearing steel pipe |
| CN114473374A (en) * | 2021-12-31 | 2022-05-13 | 南通恒力体育用品有限公司 | Processing and manufacturing process of barbell bar |
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| JPS63432A (en) * | 1986-06-20 | 1988-01-05 | Hitachi Metals Ltd | Die for casting molding and its production |
| JPH09296214A (en) * | 1996-04-29 | 1997-11-18 | Aisin Seiki Co Ltd | Method and equipment for solid forming austempering treatment |
| CN101992297A (en) * | 2010-11-05 | 2011-03-30 | 福州阿石创光电子材料有限公司 | Ceramic metal composite die and manufacturing process thereof |
| CN202779231U (en) * | 2012-08-15 | 2013-03-13 | 海盐县长江塑料电线电缆厂 | Wire drawing die core |
| CN103589991B (en) * | 2013-10-25 | 2016-06-01 | 沈阳建筑大学 | The rare earth of a kind of stainless steel cold punching die oozes vanadium method |
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Address after: 401120 Chongqing airport of Yubei District Metro No. 6 min Jia Lu Patentee after: Chongqing saifeisi metal materials Co., Ltd Address before: 401120 Chongqing City, Yubei District Airport Industrial Park No. 6 min Guan Yin Yan Jia Lu Patentee before: CHONGQING SURFACE METAL MATERIAL CO., LTD. |