CN102732878B - Laser strengthening process of piercing point - Google Patents

Laser strengthening process of piercing point Download PDF

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Publication number
CN102732878B
CN102732878B CN 201210248964 CN201210248964A CN102732878B CN 102732878 B CN102732878 B CN 102732878B CN 201210248964 CN201210248964 CN 201210248964 CN 201210248964 A CN201210248964 A CN 201210248964A CN 102732878 B CN102732878 B CN 102732878B
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CN
China
Prior art keywords
laser
perforating head
alloy layer
alloy
high
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CN 201210248964
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Chinese (zh)
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CN102732878A (en
Inventor
邓琦林
何建方
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丹阳宏图激光科技有限公司
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Priority to CN 201210248964 priority Critical patent/CN102732878B/en
Priority claimed from CN201310536959.2A external-priority patent/CN103572280B/en
Priority claimed from CN201310537047.7A external-priority patent/CN103572282B/en
Publication of CN102732878A publication Critical patent/CN102732878A/en
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Publication of CN102732878B publication Critical patent/CN102732878B/en

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Abstract

The invention relates to a laser strengthening process of a piercing point. The laser strengthening process comprises the following steps of: smelting a transition alloy layer on the surface of a substrate of the piercing point; smelting a high-strength alloy layer on the transition alloy layer by laser, wherein alloy powder used by the transition alloy layer is an nickel-based alloy; and the alloy powder used by the high-strength alloy layer is a cobalt-based alloy. In the process, the hardness of the transition alloy layer is lower than that of the high-strength alloy layer, has the transition effect on the high-hardness and high-abrasion-resistance high-strength alloy layer, and can better remit an overlaying stress, so that a residual overlaying stress does not cause great influences on tissues of a laser smelting layer even if the point is not pre-heated and not annealed, so that the phenomenon that the performance of the smelting layer is influenced by annealing can be effectively avoided and the surface hardness and the abrasion resistance of the piercing point are greatly improved; and meanwhile, the pre-heating and annealing processes are saved and the production efficiency is improved.

Description

The laser reinforcing process of perforating head

Technical field

The present invention relates to a kind of laser cladding method, the laser cladding method on especially a kind of perforating head surface.

Background technology

Along with the increase of China's weldless steel tube export volume, the consumption of the spare part that the production weldless steel tube is used also increases year by year.Perforating head is the key tool of producing weldless steel tube, and the quality of the quality of perforating head and the length in work-ing life have direct impact to Yield and quality and the production cost of weldless steel tube.Perforating head when work temperature very high, and bear very large compound stress, there will be distortion in use, subside, the inefficacies such as steel bonding, cracking.China has the perforating head that surpasses 1,000,000 to go out of use because of failure cause every year, and this numeral is just with the speed increase year after year more than 15%.If utilize laser melting and coating technique to be processed its surface these inefficacies or new perforating head, can save the more than one hundred million units of materials cost every year.

The temperature that the perforating head nose bears at work, friction ratio, impact are the highest, are positions the most easy to wear.Use laser melting and coating technique at outside surface built-up welding a layer thickness of perforating head nose alloy material of high temperature resistant, wear-resistant, high rigidity uniformly, can be so that greatly improve the work-ing life of perforating head.At present, the laser melting and coating technique adopted for perforating head both at home and abroad, be generally nickel base alloy layer or the cobalt-based alloy layer at top outside surface built-up welding one deck hard high-wearing feature.For example: Chinese patent literature CN101596551B(application number is: 200910088534.3) disclose a kind of pairing gold plating seamless steel tube top, Ni-based or the Co-based alloy coating at nose, the operate portions laser wide-band cladding of top, at aligning section, parallel portion laser wide-band cladding iron alloy coating, obtain a kind of pairing gold plating seamless steel tube top.This pairing gold plating seamless steel tube top is the different alloy layer of different sites cladding in top.

Perforating head, in the process of laser melting coating, inevitably can produce built-up welding stress, and these stress must be eliminated in time, otherwise the tissue of laser cladding layer is caused to fatal destruction.Perforating head laser melting and coating process of the prior art all must carry out preheating to top, and is annealed after built-up welding finishes, and to eliminate stress, not only operation is loaded down with trivial details, and production efficiency is slow, also can make the lower hardness of cladding layer, exists certain problem.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind ofly carries out laser melting coating to the perforating head surface, laser melting coating is before without preheating, after laser melting coating without annealing, the laser reinforcing process of the perforating head that can make perforating head surface hardness and wear resistance significantly improve.

In order to solve the problems of the technologies described above, the invention provides a kind of laser reinforcing process of perforating head, first laser melting coating transition alloy layer on the perforating head matrix surface, then on transition alloy layer laser melting coating high-strength alloy layer; The powdered alloy that described transition alloy layer adopts is nickel-base alloy, and the powdered alloy that described high-strength alloy layer adopts is cobalt base alloy.

Can better alleviate in order to make transition alloy layer the built-up welding stress produced in laser cladding process, a kind of preferred technical scheme is: the component of above-mentioned nickel-base alloy and weight percent content are C≤0.03%, Cr:15% to 19%, B:0.8% to 1.2%, Si:2% to 2.5%, all the other are Ni.Powdered alloy has strictly been controlled the content of C, makes it be not more than 0.03%, is conducive to improve the wettability of cladding layer, prevents from cladding process, cracking and pore; Simultaneously in powdered alloy, by adding appropriate B, Si, alloy is formed after solidifying take the matrix of austenite as leading; Appropriate Cr element has carried out alloy strengthening to nickel-base alloy in addition.Although transition alloy layer at high temperature hardness is less than the high-strength alloy layer, still has good welding characteristic and mechanical property.

In order to make the high-strength alloy layer at high temperature there is higher hardness and wear resistance, a kind of preferred technical scheme is: the component of above-mentioned cobalt base alloy and weight percent content are C≤0.1%, Cr:19% to 21%, B:1.5% to 2.5%, Si:1.5% to 2.5%, W:5.5% to 6.5%, Ti:0.5% to 1.5%, Al:3% to 5%, all the other are Co.Powdered alloy has strictly been controlled the content of C, makes it be not more than 0.1%, is conducive to improve the wettability of cladding layer, prevents from cladding process, cracking and pore; Simultaneously in powdered alloy, by adding appropriate B, Si, alloy is formed after solidifying take the matrix of austenite as leading; Appropriate Cr, W, Ti, Al element have carried out alloy strengthening to cobalt base alloy in addition, and play antioxygenation, make high-strength alloy layer hardness, wear resistance and welding characteristic at high temperature significantly promote.

For fear of heat in laser cladding process, in the top nose tip, concentrate, a kind of preferred technical scheme is: adopt the sectional type laser cladding method, from the nose tip of perforating head, carry out piecemeal from front to back cladding.Adopt this method to reach stress equilibrium so that the built-up welding stress produced in laser cladding process disperses more, thereby, even further guarantee not preheating, unannealed, built-up welding stress also can not affect the performance of cladding layer.

In order better to eliminate the built-up welding stress produced in laser cladding process, a kind of preferred technical scheme is: in laser cladding process, perforating head is carried out to the oscillating aging processing.Adopt this even method of elimination of just in time it being disperseed when stress produces, can effectively eliminate part built-up welding stress, thereby, even further guarantee not preheating, unannealed, built-up welding stress also can not affect the performance of cladding layer.

In order to guarantee the performance of cladding layer, better eliminate built-up welding stress, a kind of preferred technical scheme is: laser melting coating adopts the mode of preset powder feeding, and the fast-transverse-flow CO2 laser of take scans as light source carries out continuous helical feeding overlap joint to perforating head; Laser power is 1500W to 1900W, and absolute altitude is 260mm to 275mm, and spot size is 10mm * 1.8mm, and sweep velocity is 110mm/min to 140mm/min, and amount of lap is 6.5mm, and powder sending quantity is 12g/min to 18g/min.Adopt the broad band laser bundle, contribute to improve the efficiency of work; Adopt the mode of preset powder feeding, strict control powder sending quantity, and laser power, sweep velocity, amount of lap etc. are optimized, can be so that the deflection of the fixed head of perforation be little, the fusion rate of cladding layer and matrix is high, in conjunction with closely, the homogeneity of structure of cladding layer is good, thickness and hardness even.

In order to make perforating head obtain better strengthening effect, and the quality of the rear perforating head of assurance strengthening, a kind of preferred technical scheme is: before laser melting coating, pre-treatment is carried out in the surface of perforating head; After laser melting coating, perforating head is detected.

Technique scheme of the present invention has the following advantages compared to existing technology: the laser reinforcing process of perforating head of the present invention is first laser melting coating one deck transition alloy layer on matrix first, laser melting coating one deck high-strength alloy layer on transition alloy layer again, transition alloy layer hardness ratio high-strength alloy layer is low, high-strength alloy layer to hard high-wearing feature plays a transition role, and can well alleviate built-up welding stress.Even this technique makes top not preheating, unannealed, residual built-up welding stress can not cause on the tissue of laser cladding layer very large impact yet, thereby effectively avoided carrying out annealing and can affect cladding layer capability, make perforating head surface hardness and wear resistance significantly improve, hardness can reach 58 to 62HRC, saves preheating and annealing process simultaneously and has also improved production efficiency.This technique makes the perforating head longer service life, also can be used for the perforating head inefficacy and repair, be conducive to save material and resource, be conducive to reduce the seamless steel tube production cost, be conducive to reduce the pollution of discarded perforating head to environment, there is good economic benefit and social benefit.

Embodiment

The concrete steps of the laser reinforcing process of the perforating head of the present embodiment are as follows:

A. pre-treatment is carried out in the surface of perforating head.

By removings such as the dust on perforating head, greasy dirt, corrosions; Detect the size at each position; And cleaned.

B. laser melting coating is carried out in the surface of perforating head.

Adopt the sectional type laser cladding method, from the nose tip of perforating head, (the top nose tip is front end, and top external diameter maximum is rear end) carries out laser melting coating to the surface of perforating head piecemeal from front to back.First cladding one deck transition alloy layer on the perforating head matrix surface, then on transition alloy layer cladding one deck high-strength alloy layer.In laser cladding process, ceaselessly with copper rod, knock perforating head, thereby make the perforating head vibration eliminate welding stress.

Laser melting coating adopts the mode of preset powder feeding, and the fast-transverse-flow CO2 laser of take scans as light source carries out continuous helical feeding overlap joint to perforating head.Laser power is 1700W, and absolute altitude (be laser apparatus from the distance between Substrate, absolute altitude=focal length+defocusing amount) is 270mm, and spot size is 10mm * 1.8mm, and sweep velocity is 120mm/min, and amount of lap is 6.5mm, and powder sending quantity is 15g/min.The powdered alloy that transition alloy layer adopts is nickel-base alloy, and its component and weight percent content are C:0.03%, Cr:17%, and B:1%, Si:2.2%, all the other are Ni.The powdered alloy that the high-strength alloy layer adopts is cobalt base alloy, and its component and weight percent content are C:0.1%, Cr:20%, and B:2%, Si:2%, W:6%, Ti:1%, Al:4%, all the other are Co.

C., after laser melting coating finishes, perforating head is detected.

Detect surface hardness; Detect deflection; Requirement according to drawing is carried out mechanical workout to the perforating head surface; Carry out permeation flaw detection, detect the defect of the impact top mechanical propertys such as whether pore, slag inclusion, slight crack are arranged; Carry out verification, whether quality inspection is qualified.

Obviously, above-described embodiment is only for example of the present invention clearly is described, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without also giving all embodiments.And these belong to apparent variation that spirit of the present invention extended out or change still among protection scope of the present invention.

Claims (4)

1. the laser reinforcing process of a perforating head is characterized in that: first laser melting coating transition alloy layer on the perforating head matrix surface, then on transition alloy layer laser melting coating high-strength alloy layer; The powdered alloy that described transition alloy layer adopts is nickel-base alloy, and the powdered alloy that described high-strength alloy layer adopts is cobalt base alloy;
The component of described nickel-base alloy and weight percent content are C≤0.03%, Cr: 15% to 19%, B: 0.8% to 1.2%, Si: 2% to 2.5%, and all the other are Ni;
The component of described cobalt base alloy and weight percent content are C≤0.1%, Cr: 19% to 21%, B: 1.5% to 2.5%, Si: 1.5% to 2.5%, W: 5.5% to 6.5%, Ti: 0.5% to 1.5%, Al: 3% to 5%, and all the other are Co;
Laser melting coating adopts the mode of preset powder feeding, and the fast-transverse-flow CO2 laser of take scans as light source carries out continuous helical feeding overlap joint to perforating head; Laser power is 1500W to 1900W, and absolute altitude is 260mm to 275mm, and spot size is 10mm * 1.8mm, and sweep velocity is 110mm/min to 140mm/min, and amount of lap is 6.5mm, and powder sending quantity is 12g/min to 18g/min.
2. according to the laser reinforcing process of perforating head claimed in claim 1, it is characterized in that: adopt the sectional type laser cladding method, from the nose tip of perforating head, carry out piecemeal from front to back cladding.
3. according to the laser reinforcing process of the described perforating head of claim 2, it is characterized in that: in laser cladding process, perforating head is carried out to the oscillating aging processing.
4. according to the laser reinforcing process of the described perforating head of claim 1, it is characterized in that: before laser melting coating, pre-treatment is carried out in the surface of perforating head; After laser melting coating, perforating head is detected.
CN 201210248964 2012-07-18 2012-07-18 Laser strengthening process of piercing point CN102732878B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201210248964 CN102732878B (en) 2012-07-18 2012-07-18 Laser strengthening process of piercing point

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
CN 201210248964 CN102732878B (en) 2012-07-18 2012-07-18 Laser strengthening process of piercing point
CN201310536959.2A CN103572280B (en) 2012-07-18 2012-07-18 Without the need to the laser reinforcing process of the perforating head of preheating before laser melting coating
CN201310537047.7A CN103572282B (en) 2012-07-18 2012-07-18 A kind of laser cladding method of perforating head surface
CN201310537063.6A CN103572283B (en) 2012-07-18 2012-07-18 The laser reinforcing process of perforating head
CN201310537031.6A CN103572281B (en) 2012-07-18 2012-07-18 Without the need to the laser reinforcing process of the perforating head of annealing after laser melting coating

Related Child Applications (4)

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CN201310537031.6A Division CN103572281B (en) 2012-07-18 2012-07-18 Without the need to the laser reinforcing process of the perforating head of annealing after laser melting coating
CN201310537047.7A Division CN103572282B (en) 2012-07-18 2012-07-18 A kind of laser cladding method of perforating head surface
CN201310537063.6A Division CN103572283B (en) 2012-07-18 2012-07-18 The laser reinforcing process of perforating head
CN201310536959.2A Division CN103572280B (en) 2012-07-18 2012-07-18 Without the need to the laser reinforcing process of the perforating head of preheating before laser melting coating

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CN103343339B (en) * 2013-06-29 2015-10-07 苏州唐氏机械制造有限公司 The laser repair method of Drawing Die
CN103769794A (en) * 2014-01-07 2014-05-07 烟台开发区蓝鲸金属修复有限公司 Strengthening method of surface of piercing plug of seamless steel tube rolling mill
CN103898518B (en) * 2014-03-24 2017-04-19 杭州大冶激光科技有限公司 Repairing method of cracks on roll surface of back-up roll of rolling mill
CN104588931A (en) * 2014-12-04 2015-05-06 常州大学 Surfacing method for seamless tube piercing plug
CN105018857A (en) * 2015-08-06 2015-11-04 宁波市鄞州文昌金属制品有限公司 High-temperature-resistant steel pipe piercing plug
CN105039972A (en) * 2015-08-06 2015-11-11 宁波市鄞州文昌金属制品有限公司 Abrasion-resistant steel pipe piercing plug
CN108179417B (en) * 2018-01-17 2019-12-06 河南省煤科院耐磨技术有限公司 manufacturing method of large-size bimetal wear-resistant corrosion-resistant composite plate
CN108425034A (en) * 2018-04-03 2018-08-21 烟台万隆真空冶金股份有限公司 A kind of surface reinforcing method of beryllium copper Casting Roller set

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CN103572283B (en) 2015-09-23
CN103572281B (en) 2015-09-30
CN103572281A (en) 2014-02-12
CN103572283A (en) 2014-02-12
CN102732878A (en) 2012-10-17

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