CN101914659A - Surface pulse discharge discrete strengthening method for hot roll - Google Patents
Surface pulse discharge discrete strengthening method for hot roll Download PDFInfo
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- CN101914659A CN101914659A CN 201010238878 CN201010238878A CN101914659A CN 101914659 A CN101914659 A CN 101914659A CN 201010238878 CN201010238878 CN 201010238878 CN 201010238878 A CN201010238878 A CN 201010238878A CN 101914659 A CN101914659 A CN 101914659A
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Abstract
The invention relates to a method for carrying out surface discrete strengthening on a hot roll by adopting pulse discharge. The method utilizes the pulse discharge for producing discrete strengthening points on the surface of the roll. Discharge points with different depth-to-diameter ratios can be obtained by adjusting current, pulse width and curvature of the head part of a tool electrode, and the fusing strengthening and the alloying can be carried out on the roll by using different electrode materials. The distribution of the strengthening points can be adjusted by controlling processing parameters, thereby mutually separating or mutually covering the strengthening points. Compared with the planar strengthening, the discrete strengthening method can not only improve the abrasion resistance and the fatigue property of the surface, but also reduce the heat input and avoid the production of process cracks during the processing process.
Description
Technical field
The present invention relates to a kind of hot roll surface reinforcing method, the discrete enhancement method in particularly a kind of impulsive discharge surface.
Background technology
During the hot rolling operation such as cogging, rolled section steel, wire rod, sheet material, band steel etc. all use hot roll.The working conditions of hot roll is abominable, and there is the periodically contact stress of effect in roll between roller surface and the stocking when bearing big overdraft.In addition, in the operation of rolling, because roll is heated and water quench by stocking (about 1100 ℃ of general temperature) repeatedly, the range of temperature that stands is bigger, and roll also bears the periodically thermal stresses of effect.Under periodicity contact stress and thermal stresses effect, the failure mode of hot roll mainly shows as fracture and surface fatigue wearing and tearing, therefore requires the hot roll material that intensity and toughness are preferably not only arranged, and higher anti-surface fatigue polishing machine will be arranged.By can improve the antifatigue polishing machine of roll to the hot roll surface strengthening, do not influence the toughness of roll heart portion simultaneously.
To the planar processing of the many employings of hot roll surface strengthening, for example, Chinese patent: application number 200610047997, denomination of invention: a kind of laser nanometer cermet alloying process for surface of metallurgic hot roller, it uses CO at present
2Alloying is carried out on laser and nano ceramics dope layer breaker roll surface.For example, Chinese patent: publication number 1438088, denomination of invention: large-scale roller hard-face overlaying welding restorative procedure, it uses the method for welding wire built-up welding to repair large-scale roller.The input of planar reinforcement heat is big, is difficult to avoid for large-scale roller processing crackle.
The method that the present invention adopts impulsive discharge is to the reinforcement of dispersing of hot roll surface.Discrete enhancement method has following characteristics: 1. the strengthening point has the hardness that is higher than matrix, can improve surface abrasion resistance, and the strengthening point of certain depth has the effect of retardance fatigue crack growth, the fatigue lifetime that can improve roller surface simultaneously.2. discrete the reinforcement processed the toughness that has kept matrix, and the heat input is smaller, can better discharge stress, avoids the generation of technology crackle in the course of processing.3. discrete reinforcement processing has higher process velocity.
At present, the method that adopts discrete surface to strengthen has Chinese patent: publication number 1358602, denomination of invention: the system and the enhancement method that adopt high-frequency impulse laser that hot roll is strengthened, it adopts high-frequency impulse laser that hot roll is strengthened.Compare with this patent, the discrete reinforcement of impulsive discharge is higher than the discrete efficient of strengthening of laser, implements convenient.Simultaneously, can implement alloying to the strengthening point, can further improve the fatigue property of roller surface by electrode melting.
Summary of the invention
At the problem in the hot roll use, the present invention proposes the discrete method of strengthening roller surface of impulsive discharge of utilizing.
For achieving the above object, technical solution of the present invention is: a kind of surface pulse discharge discrete strengthening method for hot roll, and tool using electrode and roll constitute electrode pair in air, and described tool-electrode is a negative polarity, and described roll is anodal and ground connection; Tool-electrode and roller surface maintain a certain distance; Under the discharge power supply effect, the breakdown formation electric arc of the electrode gap between tool-electrode and the roll, heat on electric arc breaker roll surface, and form the molten bath, after form the strengthening point at roller surface after quench cooled.
Further, described electrode pair discharges under the control of discharge power supply, and discharge power supply can setting pulse width, pulsed current and repetition rate.
Further, use shielding gas in discharge process, described shielding gas is argon gas or nitrogen, and protection molten bath and discharge electrode are not oxidized.
Further, can obtain the point of discharge of different aspect ratios with tool-electrode head curvature, thereby satisfy the requirement of described roll fatigue strength by adjustment electric current, pulse width.
Further, can obtain smooth strengthening point by adjusting arc pressure.
Further, tool-electrode adopts high-meltiing alloy or low melting point alloy to make; The loss of high-meltiing alloy electrode is little, is suitable for consolidation and strengthens processing; The low melting point alloy electrode takes place little molten in the electrodischarge machining(E.D.M.) process, electrode composition sneak into the molten bath in, alloying has been carried out in the molten bath.
Further, described high-meltiing alloy is a tungstenalloy.
Further, discrete point of discharge is separated from each other, the retained part original surface; Or cover mutually, original surface is covered fully.
Further, discrete strengthening surface is carried out grinding, obtain bright and clean surface; Or directly use the roll after strengthening to be rolled.
Disclosed hot roll surface reinforcing method utilizes impulsive discharge to produce discrete strengthening point at roller surface among the present invention.By adjusting the point of discharge that electric current, pulse width and tool-electrode head curvature can obtain different aspect ratios, can carry out consolidation reinforcement and alloying by breaker roll by using different electrode materialss.Can adjust the distribution of strengthening point by controlling machined parameters, the strengthening point is separated from each other or covering mutually.With planar strengthening phase ratio, discrete enhancement method can improve the wear resistance and the fatigue property on surface, can reduce the heat input again, avoids the generation of technology crackle in the course of processing.
Description of drawings
Fig. 1 is a schematic diagram of the present invention;
The 1-tool-electrode, the 2-roll, the 3-electrode head, 4-electric arc, the 5-strengthening point, the angle of 6-electrode and roll, the 7-valve, 8-protects gas, 9-roll rotational speed;
The separated surface picture in Fig. 2 strengthening point;
The surface picture that Fig. 3 strengthening point covers mutually;
Fig. 4 strengthening point cross-sectional picture.
Embodiment
As shown in fig. 1, columniform tool-electrode 1 and roll 2 constitute electrode pair, and tool-electrode 1 is a negative pole, and roll 2 is anodal and ground connection.
Columniform tool-electrode 1 has conical electrode head 3, and the head curvature of electrode head 3 can change, to adjust the strengthening point diameter.
Adjust the distance on tool-electrode 1 and roll 2 surfaces, guarantee to put formation electric arc 4 stable between the point electrode.
Under the discharge power supply effect, the breakdown formation electric arc 4 of electrode gap between tool-electrode 1 and the roll 2, but heat on electric arc 4 breaker rolls 2 surfaces, and formation molten bath, subsequently, warp is from quench cooled, and just fusing point forms the i.e. strengthening point shown in the figure 5 of enhanced tissue by the thermal conduction rapid quenching of roll self at roller surface.
Discharge power supply can the setting pulse width, pulsed current, and repetition rate.
The angle 6 of tool-electrode 1 and roll 2 surface normals, angle 6 can change between 0-30 °.
Roll rotates with rotating speed 9, and tool-electrode 1 is implemented the discrete processing of strengthening along roll 2 axial-movements simultaneously.Along the movement velocity of roll line and the rotating speed 9 of roll 2, make the strengthening point present two kinds of distributions by control discharge frequency, tool- electrode 1,1. discrete strengthening point is separated from each other the retained part original surface; 2. the strengthening point is overlapped, and original surface is covered fully.The embodiment that produces the 1st kind of strengthening point distribution shown in Figure 2 is: roller diameter is 60mm, and the point of discharge diameter is 1mm, gets the point of discharge distance and is 2mm, and then tool-electrode 1 is 2mm along the pitch of roll 2 axial-movements.Make that discharge frequency is 200Hz, the rotating speed that 1 roll 2 rotating speeds 9 of then distributing are is 120 rev/mins.The embodiment that produces the 2nd kind of strengthening point distribution shown in Figure 3 is: roller diameter is 60mm, and the point of discharge diameter is 1mm, gets the point of discharge distance and is 1mm, and then tool-electrode 1 is 1mm along the pitch of roll 2 axial-movements.Make that discharge frequency is 200Hz, the rotating speed that 1 roll 2 rotating speeds 9 of then distributing are is 60 rev/mins.
For guarantee to continue, stable discharge, discharge electrode uses water cooling.
Tool-electrode 1 can adopt high-meltiing alloy or low melting point alloy to make.The loss of high-meltiing alloy electrode is little, is suitable for consolidation and strengthens processing; For example: tungstenalloy, breaker roll 2 surfaces are implemented consolidation and are strengthened processing.The low melting point alloy tool-electrode takes place little molten in the electrodischarge machining(E.D.M.) process, in the electrodischarge machining(E.D.M.) process electrode composition sneak into the molten bath in, alloying is implemented in the molten bath.
As shown in Figure 4, the reinforcement degree of depth of strengthening point 5 reaches 400 μ m, can satisfy the fatigue property requirement.
After breaker roll carries out above-mentioned reinforcement processing, can carry out grinding to discrete strengthening surface, obtain bright and clean surface, also can directly use the roll after the reinforcement to be rolled according to the hot rolling technology requirement.
Claims (9)
1. surface pulse discharge discrete strengthening method for hot roll is characterized in that: tool using electrode and roll constitute electrode pair in air, and described discharge electrode is a negative polarity, and described roll be anodal also ground connection; Discharge electrode and roller surface maintain a certain distance; Under the discharge power supply effect, the breakdown formation electric arc of the electrode gap between tool-electrode and the roll, heat on electric arc breaker roll surface, and form the molten bath, after form the strengthening point at roller surface after quench cooled.
2. the roller surface impulsive discharge as claimed in claim 1 enhancement method that disperses, it is characterized in that: described electrode pair discharges under the control of discharge power supply, and discharge power supply can setting pulse width, pulsed current and repetition rate.
3. the roller surface impulsive discharge as claimed in claim 1 enhancement method that disperses, it is characterized in that: use shielding gas in discharge process, described shielding gas is argon gas or nitrogen, protection molten bath and discharge electrode are not oxidized.
4. the roller surface impulsive discharge as claimed in claim 1 enhancement method that disperses is characterized in that: by adjust electric current, pulse width can obtain the point of discharge of different aspect ratios with tool-electrode head curvature, thereby satisfy the requirement of described roll fatigue strength.
5. the roller surface impulsive discharge as claimed in claim 1 enhancement method that disperses is characterized in that: can obtain smooth strengthening point by adjusting arc pressure.
6. the roller surface impulsive discharge as claimed in claim 1 enhancement method that disperses is characterized in that: tool-electrode adopts high-meltiing alloy or low melting point alloy to make; The loss of high-meltiing alloy electrode is little, is suitable for consolidation and strengthens processing; The low melting point alloy electrode takes place little molten in the electrodischarge machining(E.D.M.) process, electrode composition sneak into the molten bath in, alloying has been carried out in the molten bath.
7. the roller surface impulsive discharge as claimed in claim 6 enhancement method that disperses, it is characterized in that: described high-meltiing alloy is a tungstenalloy.
8. the roller surface impulsive discharge as claimed in claim 1 enhancement method that disperses, it is characterized in that: discrete point of discharge is separated from each other, the retained part original surface; Or cover mutually, original surface is covered fully.
9. according to the discrete enhancement method of the described roller surface impulsive discharge of above-mentioned arbitrary claim, it is characterized in that: described discrete strengthening surface is carried out grinding, obtain bright and clean surface; Or directly use the roll after strengthening to be rolled.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010238878 CN101914659A (en) | 2010-07-27 | 2010-07-27 | Surface pulse discharge discrete strengthening method for hot roll |
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| CN 201010238878 CN101914659A (en) | 2010-07-27 | 2010-07-27 | Surface pulse discharge discrete strengthening method for hot roll |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102172833A (en) * | 2011-02-21 | 2011-09-07 | 南京航空航天大学 | Controllable and ablated non-conductive engineering ceramic grinding method based on discharge induction |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010014405A1 (en) * | 1998-11-13 | 2001-08-16 | Takashi Yuzawa | Surface treatment method using electric discharge, and an electrode for the surface treatment method |
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2010
- 2010-07-27 CN CN 201010238878 patent/CN101914659A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010014405A1 (en) * | 1998-11-13 | 2001-08-16 | Takashi Yuzawa | Surface treatment method using electric discharge, and an electrode for the surface treatment method |
| CN1103654C (en) * | 1998-11-13 | 2003-03-26 | 三菱电机株式会社 | Discharge surface treating method and electrode for discharge surface treatment |
Non-Patent Citations (2)
| Title |
|---|
| 《中国激光》 20100430 王之桐，周终强 YAG激光诱导放电表面离散强化形貌试验研究 1118-1121 1-9 第37卷, 第4期 2 * |
| 《机械设计与制造》 20050830 宋阳，朱世根，渠彬，顾伟生 轧辊表面修复与强化的技术途径 113-115 1-9 , 第8期 2 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102172833A (en) * | 2011-02-21 | 2011-09-07 | 南京航空航天大学 | Controllable and ablated non-conductive engineering ceramic grinding method based on discharge induction |
| CN102172833B (en) * | 2011-02-21 | 2012-10-03 | 南京航空航天大学 | Controllable and ablated non-conductive engineering ceramic grinding method based on discharge induction |
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Open date: 20101215 |