CN106676452A - Process for improving hardness and abrasion resistance of calendering roll - Google Patents
Process for improving hardness and abrasion resistance of calendering roll Download PDFInfo
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- CN106676452A CN106676452A CN201611237676.8A CN201611237676A CN106676452A CN 106676452 A CN106676452 A CN 106676452A CN 201611237676 A CN201611237676 A CN 201611237676A CN 106676452 A CN106676452 A CN 106676452A
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- tungsten carbide
- cast iron
- abrasion resistance
- coating
- roller surface
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
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- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Rolls And Other Rotary Bodies (AREA)
- Paper (AREA)
Abstract
The invention relates to the technical field of papermaking techniques, in particular to a process for improving hardness and abrasion resistance of a calendering roll. The process comprises the steps of 1, material selection; 2, surface pretreatment of a cast iron roll; 3, pulverization of a coating material; 4, heating for fusion; 5, spraying; and 6, aftertreatment of a coating. According to the process for improving hardness and abrasion resistance of the calendering roll, the tungsten carbide coating is applied to the surface of the cast iron roll through spraying, so that hardness of the roll surface is improved from original 530-600 HV to 1200-1400 HV; smoothness and outline durability are obviously enhanced; and abrasion resistance is also improved in that the service cycle of the calendering roll is prolonged from the previous 6 months to 18 months. The process for improving hardness and abrasion resistance of the calendering roll has the beneficial effects of being simple, low in production cost and applicable to large-scale production.
Description
Technical field
The present invention relates to paper technology technical field, and in particular to a kind of hardness of improvement felt wrapped roll and the work of abrasion resistance
Skill.
Background technology
In paper-making process, the Paper or cardboard containing certain moisture is processed using calender, to improve paper
Smoothness and glossiness, and the thickness to Paper or cardboard is controlled to a certain extent.At present, the development of online calendering techniques
The paper technology in the whole world is constantly affected, calendering equipment is the important technology for carrying out ornamenting processing in paper-making process to paper surface
Equipment.Due to the change adjustment of wastepaper as raw material used aborning and production paper kind so that calender was used in daily
Effect is unsatisfactory in journey, and the serious service life of the roll surface wearing of felt wrapped roll shortens, after through press polish into paper smoothness, gloss
The physical characteristic such as degree and two sides difference is not obviously improved so that the calendaring effect is had a greatly reduced quality.And in subsequent handling, paper rises stupefied
Cause rewinding difficult, discounting degradation paper occur.
In the prior art, there is following defect in felt wrapped roll：（1）The paper tightness of outgoing nip is inconsistent.Workshop uses
Chill cast share iron roll, when resilient roller is pressed onto chill cast share iron roll with certain line pressure, due to both sides deformation, its nip width just becomes
Roller harder than two is much broader when contacting, and contact surface is no longer a plane, if there is rugged patch in page, pressure
Power is with regard to heterogeneity.Into the page of nip, when thickness patch high or too many flocculation block, pressure is up at most herein, surrounding area
It is then more inconsistent so as to also result in paper tightness after compression out when than relatively low.（2）Formation of sheet is bad, reveals the exact details and color spot feelings
Condition happens occasionally.It is now reclaimed waste paper with raw material, secondary fibre recycling number of times is continuously increased, and increasing for tiny sand grains causes press polish
Roller roll surface pit, serious wear causes deformation, and the adhesion for so resulting in fiber is deteriorated, and the evenness and physics for influenceing into paper are strong
Degree.（3）Roller shell case hardness is inadequate.For the hard roller and hot-rolling of calender, usual material is chilled cast iron, surface chill thickness
Degree typically only 10-12mm, in order to ensure optimal adhesion strength, the hardness of roller shell should ＞ 540HV, with roller grinding time
Number increases, and chilling layer more and more thinner, local location hardness may decline, even below below 540HV, roller mill easily occurs
The problems such as damaging fast, milling cycle is short, after more than 10 chilling layers of millimeter are all ground off, hard roller and hot-rolling can only scrap place
Reason.（4）There is pit in roll surface.Because slurry block or other impurities enter nip, cause the intensity of pressure of this point too high, make
Obtain and many pits are often had to hard calender roll surface firmly.（5）Vibration and the change of banner thickness curve are greatly.Roller longtime running is made
Cause roller low amplitude vibrations into abrasion deformation, paper is larger in calender outlet banner thickness curve fluctuation.（6）Usage cycles are short,
Grinding frequency is high.Because chilled cast iron soft material and felt wrapped roll high temperature aggravation roll surface wearing, roll profile tolerance in the short time
Greatly, the usage cycles of grinding are greatly shortened.
The content of the invention
The purpose of the present invention is to solve the shortcomings of the prior art, there is provided a kind of hardness and abrasion resistance for improving felt wrapped roll
Technique.
To achieve these goals, the present invention is adopted the following technical scheme that：
A kind of technique of the hardness and abrasion resistance for improving felt wrapped roll is provided, it is comprised the following steps：
It is comprised the following steps：
Step one, selection：Selection tungsten carbide is used as the coating material for depositing to cast iron roller surface；
Step 2, cast iron roll surface preparation：Original coating removal before cast iron roller surface is done into Net and is ground；
Step 3, crushes coating material：The tungsten carbide powder of step one is broken into powdered tungsten carbide；
Step 4, heating melting：Powdered tungsten carbide to step 3 carries out being heated to molten condition；
Step 5, spraying：The tungsten carbide of molten condition in step 4 is ejected into certain spraying rate using compressed air
Cast iron roller surface pretreated in step 2, certain thickness tungsten carbide coating is formed with deposition；
Step 6, the treatment of coating later stage：Tungsten carbide coating to the cast iron roller surface of step 5 carries out preservative treatment.
In above-mentioned technical proposal, in the step 2, the greasy dirt of cast iron roller surface is first removed using degreaser, then by cast iron
Original coating removal is done Net and is ground before roller surface.
In above-mentioned technical proposal, in the step 2, using the method for sandblasting, electric plucking or machining by cast iron roll table
The dry Net of original coating removal before face.
In above-mentioned technical proposal, in the step 4, using electric arc, plasma spraying or combustion flame by the powder of step 3
Last shape tungsten carbide carries out being heated to molten condition.
In above-mentioned technical proposal, in the step 5, the spraying rate is 30m/s ~ 50m/s.
In above-mentioned technical proposal, it is preferred that in the step 5, the spraying rate is 40m/s.
In above-mentioned technical proposal, in the step 5, the thickness of the tungsten carbide coating is 100 μm ~ 200 μm.
In above-mentioned technical proposal, it is preferred that in the step 5, the thickness of the tungsten carbide coating is 150 μm.
In above-mentioned technical proposal, in the step 5, the roughness of the tungsten carbide coating is 0.03 μm ~ 0.05 μm.
In above-mentioned technical proposal, in the step 6, the tungsten carbide coating of the cast iron roller surface of step 5 is carried out spray zinc,
Aluminium-plated, spray lead, storage tank spray ceramics to make preservative treatment.
Compared with prior art, beneficial effect is the present invention：
（1）The hardness and the technique of abrasion resistance of a kind of improvement felt wrapped roll that the present invention is provided, spray by cast iron roll surface
Apply tungsten carbide coating so that roll surface hardness is by original 530HV ~ 600HV liftings to 1200HV ~ 1400HV, smoothness and shape line
Persistence has and is obviously improved, and wear resistance also causes that its usage cycles was increased to 18 months by 6 months before.Reducing line
Energy consumption can be saved when pressure and oil temperature and has more preferable bulk.By the roll surface of sprayed wc coating, roller grinding week
Phase improves 2 times, reduces later stage roll changing time and artificial input, keeps the stable operation of paper machine.Simultaneously as tungsten carbide coating
Thickness is 100 μm ~ 200 μm and roughness is 0.03 μm ~ 0.05 μm so that the characteristic such as smoothness of roller has significant change,
The intimate minute surface of roll surface, this also greatly improves into the surface quality such as paper smoothness, glossiness so that the presentation quality into paper has good
It is good to improve.
（2）The hardness and the technique of abrasion resistance of a kind of improvement felt wrapped roll that the present invention is provided, with process is simple, are produced into
This is low, and can be applied to the characteristics of mass producing.
Specific embodiment
In order that technical problem solved by the invention, technical scheme and beneficial effect become more apparent, below in conjunction with
Embodiment, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only used to explain
The present invention, is not intended to limit the present invention.
Embodiment 1.
A kind of technique of the hardness and abrasion resistance for improving felt wrapped roll, it is comprised the following steps：
Step one, selection：Selection tungsten carbide is used as the coating material for depositing to cast iron roller surface；
Step 2, cast iron roll surface preparation：The greasy dirt of cast iron roller surface is first removed using degreaser, then using the method for sandblasting
Original coating removal before cast iron roller surface is done into Net and is ground；
Step 3, crushes coating material：The tungsten carbide powder of step one is broken into powdered tungsten carbide；
Step 4, heating melting：The powdered tungsten carbide of step 3 is carried out being heated to molten condition using electric arc；
Step 5, spraying：The tungsten carbide of molten condition in step 4 is ejected into the spraying rate of 40m/s using compressed air
Cast iron roller surface pretreated in step 2, the tungsten carbide coating of 150 μ m thicks is formed with deposition；In the present embodiment, carbon
The roughness for changing tungsten coating is 0.04 μm；
Step 6, the treatment of coating later stage：Tungsten carbide coating to the cast iron roller surface of step 5 carries out spray zinc to make preservative treatment.
The hardness and the technique of abrasion resistance of a kind of improvement felt wrapped roll of the present embodiment, spray by cast iron roll surface
Tungsten carbide coating so that roll surface hardness is greatly improved, smoothness and shape line persistence have and are obviously improved, and wear resistance is also caused
Its usage cycles was increased to 18 months by 6 months before.
Embodiment 2.
A kind of technique of the hardness and abrasion resistance for improving felt wrapped roll, it is comprised the following steps：
Step one, selection：Selection tungsten carbide is used as the coating material for depositing to cast iron roller surface；
Step 2, cast iron roll surface preparation：The greasy dirt of cast iron roller surface is first removed using degreaser, then using the side of electric plucking
Method is by the dry Net of original coating removal before cast iron roller surface and is ground；
Step 3, crushes coating material：The tungsten carbide powder of step one is broken into powdered tungsten carbide；
Step 4, heating melting：The powdered tungsten carbide of step 3 is carried out being heated to molten condition using plasma spraying；
Step 5, spraying：The tungsten carbide of molten condition in step 4 is ejected into the spraying rate of 30m/s using compressed air
Cast iron roller surface pretreated in step 2, the tungsten carbide coating of 100 μ m thicks is formed with deposition；In the present embodiment, carbon
The roughness for changing tungsten coating is 0.03 μm；
Step 6, the treatment of coating later stage：The tungsten carbide coating of the cast iron roller surface of step 5 is carried out aluminium-plated to make preservative treatment.
The hardness and the technique of abrasion resistance of a kind of improvement felt wrapped roll of the present embodiment, spray by cast iron roll surface
Tungsten carbide coating so that roll surface hardness is greatly improved, smoothness and shape line persistence have and are obviously improved, and wear resistance is also caused
Its usage cycles was increased to 18 months by 6 months before.
Embodiment 3.
A kind of technique of the hardness and abrasion resistance for improving felt wrapped roll, it is comprised the following steps：
Step one, selection：Selection tungsten carbide is used as the coating material for depositing to cast iron roller surface；
Step 2, cast iron roll surface preparation：The greasy dirt of cast iron roller surface is first removed using degreaser, then using machining
Method is by the dry Net of original coating removal before cast iron roller surface and is ground；
Step 3, crushes coating material：The tungsten carbide powder of step one is broken into powdered tungsten carbide；
Step 4, heating melting：The powdered tungsten carbide of step 3 is carried out being heated to molten condition using combustion flame；
Step 5, spraying：The tungsten carbide of molten condition in step 4 is ejected into the spraying rate of 50m/s using compressed air
Cast iron roller surface pretreated in step 2, the tungsten carbide coating of 200 μ m thicks is formed with deposition；In the present embodiment, carbon
The roughness for changing tungsten coating is 0.05 μm；
Step 6, the treatment of coating later stage：Tungsten carbide coating to the cast iron roller surface of step 5 carries out spray lead to make preservative treatment.
The hardness and the technique of abrasion resistance of a kind of improvement felt wrapped roll of the present embodiment, spray by cast iron roll surface
Tungsten carbide coating so that roll surface hardness is greatly improved, smoothness and shape line persistence have and are obviously improved, and wear resistance is also caused
Its usage cycles was increased to 18 months by 6 months before.
Embodiment 4.
A kind of technique of the hardness and abrasion resistance for improving felt wrapped roll, it is comprised the following steps：
Step one, selection：Selection tungsten carbide is used as the coating material for depositing to cast iron roller surface；
Step 2, cast iron roll surface preparation：The greasy dirt of cast iron roller surface is first removed using degreaser, then using the method for sandblasting
Original coating removal before cast iron roller surface is done into Net and is ground；
Step 3, crushes coating material：The tungsten carbide powder of step one is broken into powdered tungsten carbide；
Step 4, heating melting：The powdered tungsten carbide of step 3 is carried out being heated to molten condition using electric arc；
Step 5, spraying：The tungsten carbide of molten condition in step 4 is ejected into the spraying rate of 35m/s using compressed air
Cast iron roller surface pretreated in step 2, the tungsten carbide coating of 130 μ m thicks is formed with deposition；In the present embodiment, carbon
The roughness for changing tungsten coating is 0.03 μm；
Step 6, the treatment of coating later stage：Tungsten carbide coating to the cast iron roller surface of step 5 carries out storage tank to make anti-corrosion
Treatment.
The hardness and the technique of abrasion resistance of a kind of improvement felt wrapped roll of the present embodiment, spray by cast iron roll surface
Tungsten carbide coating so that roll surface hardness is greatly improved, smoothness and shape line persistence have and are obviously improved, and wear resistance is also caused
Its usage cycles was increased to 18 months by 6 months before.
Embodiment 5.
A kind of technique of the hardness and abrasion resistance for improving felt wrapped roll, it is comprised the following steps：
Step one, selection：Selection tungsten carbide is used as the coating material for depositing to cast iron roller surface；
Step 2, cast iron roll surface preparation：The greasy dirt of cast iron roller surface is first removed using degreaser, then using machining
Method is by the dry Net of original coating removal before cast iron roller surface and is ground；
Step 3, crushes coating material：The tungsten carbide powder of step one is broken into powdered tungsten carbide；
Step 4, heating melting：The powdered tungsten carbide of step 3 is carried out being heated to molten condition using combustion flame；
Step 5, spraying：The tungsten carbide of molten condition in step 4 is ejected into the spraying rate of 45m/s using compressed air
Cast iron roller surface pretreated in step 2, the tungsten carbide coating of 170 μ m thicks is formed with deposition；In the present embodiment, carbon
The roughness for changing tungsten coating is 0.05 μm；
Step 6, the treatment of coating later stage：Tungsten carbide coating to the cast iron roller surface of step 5 carries out spray ceramics to make at anti-corrosion
Reason.
The hardness and the technique of abrasion resistance of a kind of improvement felt wrapped roll of the present embodiment, spray by cast iron roll surface
Tungsten carbide coating so that roll surface hardness is greatly improved, smoothness and shape line persistence have and are obviously improved, and wear resistance is also caused
Its usage cycles was increased to 18 months by 6 months before.
Finally it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than the present invention is protected
The limitation of scope is protected, although being explained to the present invention with reference to preferred embodiment, one of ordinary skill in the art should
Work as understanding, technical scheme can be modified or equivalent, without deviating from the reality of technical solution of the present invention
Matter and scope.
Claims (10)
1. it is a kind of improve felt wrapped roll hardness and abrasion resistance technique, it is characterised in that：It is comprised the following steps：
Step one, selection：Selection tungsten carbide is used as the coating material for depositing to cast iron roller surface；
Step 2, cast iron roll surface preparation：Original coating removal before cast iron roller surface is done into Net and is ground；
Step 3, crushes coating material：The tungsten carbide powder of step one is broken into powdered tungsten carbide；
Step 4, heating melting：Powdered tungsten carbide to step 3 carries out being heated to molten condition；
Step 5, spraying：The tungsten carbide of molten condition in step 4 is ejected into certain spraying rate using compressed air
Cast iron roller surface pretreated in step 2, certain thickness tungsten carbide coating is formed with deposition；
Step 6, the treatment of coating later stage：Tungsten carbide coating to the cast iron roller surface of step 5 carries out preservative treatment.
2. it is according to claim 1 it is a kind of improve felt wrapped roll hardness and abrasion resistance technique, it is characterised in that：The step
In rapid two, the greasy dirt of cast iron roller surface is first removed using degreaser, then original coating removal before cast iron roller surface is clean
And ground.
3. it is according to claim 1 it is a kind of improve felt wrapped roll hardness and abrasion resistance technique, it is characterised in that：The step
In rapid two, original coating removal before cast iron roller surface is done by Net using the method for sandblasting, electric plucking or machining.
4. it is according to claim 1 it is a kind of improve felt wrapped roll hardness and abrasion resistance technique, it is characterised in that：The step
In rapid four, the powdered tungsten carbide of step 3 is carried out being heated to molten condition using electric arc, plasma spraying or combustion flame.
5. it is according to claim 1 it is a kind of improve felt wrapped roll hardness and abrasion resistance technique, it is characterised in that：The step
In rapid five, the spraying rate is 30m/s ~ 50m/s.
6. it is according to claim 5 it is a kind of improve felt wrapped roll hardness and abrasion resistance technique, it is characterised in that：The step
In rapid five, the spraying rate is 40m/s.
7. it is according to claim 1 it is a kind of improve felt wrapped roll hardness and abrasion resistance technique, it is characterised in that：The step
In rapid five, the thickness of the tungsten carbide coating is 100 μm ~ 200 μm.
8. it is according to claim 7 it is a kind of improve felt wrapped roll hardness and abrasion resistance technique, it is characterised in that：The step
In rapid five, the thickness of the tungsten carbide coating is 150 μm.
9. it is according to claim 1 it is a kind of improve felt wrapped roll hardness and abrasion resistance technique, it is characterised in that：The step
In rapid five, the roughness of the tungsten carbide coating is 0.03 μm ~ 0.05 μm.
10. it is according to claim 1 it is a kind of improve felt wrapped roll hardness and abrasion resistance technique, it is characterised in that：It is described
In step 6, the tungsten carbide coating to the cast iron roller surface of step 5 carries out spray zinc, aluminium-plated, spray lead, storage tank or spray ceramics
To make preservative treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611237676.8A CN106676452A (en) | 2016-12-28 | 2016-12-28 | Process for improving hardness and abrasion resistance of calendering roll |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611237676.8A CN106676452A (en) | 2016-12-28 | 2016-12-28 | Process for improving hardness and abrasion resistance of calendering roll |
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| CN106676452A true CN106676452A (en) | 2017-05-17 |
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| CN201611237676.8A Pending CN106676452A (en) | 2016-12-28 | 2016-12-28 | Process for improving hardness and abrasion resistance of calendering roll |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109913788A (en) * | 2019-03-18 | 2019-06-21 | 广东省新材料研究所 | A kind of paper for daily use rewind roll and preparation method thereof |
| CN111921598A (en) * | 2020-08-28 | 2020-11-13 | 矿冶科技集团有限公司 | Elastic soft contact overcoming internal stress grinding separation technology and equipment |
| CN113529004A (en) * | 2021-07-06 | 2021-10-22 | 河北苹乐面粉机械集团有限公司 | Grinding roller surface treatment method |
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| US4989306A (en) * | 1988-04-28 | 1991-02-05 | Valmet Paper Machinery Inc. | Roll for directly contacting a web |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109913788A (en) * | 2019-03-18 | 2019-06-21 | 广东省新材料研究所 | A kind of paper for daily use rewind roll and preparation method thereof |
| CN111921598A (en) * | 2020-08-28 | 2020-11-13 | 矿冶科技集团有限公司 | Elastic soft contact overcoming internal stress grinding separation technology and equipment |
| CN113529004A (en) * | 2021-07-06 | 2021-10-22 | 河北苹乐面粉机械集团有限公司 | Grinding roller surface treatment method |
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