CN108842127B - Pretreatment method for repairing supersonic spraying surface of hot roller - Google Patents
Pretreatment method for repairing supersonic spraying surface of hot roller Download PDFInfo
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- CN108842127B CN108842127B CN201810872086.5A CN201810872086A CN108842127B CN 108842127 B CN108842127 B CN 108842127B CN 201810872086 A CN201810872086 A CN 201810872086A CN 108842127 B CN108842127 B CN 108842127B
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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
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/129—Flame spraying
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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
- C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
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Abstract
The invention discloses a pretreatment method for repairing a supersonic spraying surface of a hot roller, which comprises the following specific steps: 1) performing concave cutting treatment; 2) cleaning the surface; 3) the surface is provided with a plate shape; 4) the method comprises the following steps of surface roughening, wherein the surface roughening specifically comprises the following steps: (1) carrying out primary sand blasting to form a pattern similar to a vertical bar, wherein the roughness is controlled between Ra2.5-Ra3.2; (2) stopping the roller from rotating, fixing two sample plates on the surface of the roller subjected to primary sand blasting, and performing sand blasting by a sand blasting gun along a spiral gap between the two sample plates, wherein the roughness is controlled to be Ra5.5-Ra6.5; (3) turning over the two templates and fixing the templates on the surface of the roller subjected to secondary sand blasting, and performing sand blasting by a sand blasting gun along a spiral gap between the two templates, wherein the roughness is controlled between Ra5.5 and Ra6.5; (4) and preheating the hot roller. The method can obtain the supersonic spraying layer with high bonding strength and super-strong wear resistance, thereby prolonging the service life of the roller and reducing the production cost.
Description
Technical Field
The invention belongs to the technical field of material surface strengthening, and particularly relates to a pretreatment method for repairing a supersonic spraying surface of a hot roller.
Background
The rolls of the hot-rolled sheet are important components of the rolling mill and play a critical role in the quality of the rolled piece. In the daily use process of the roller, the roller surface is in contact with and rubs against a rolled piece for a long time, and the roller surface is easy to wear and needs to be repaired. Before spraying, the roller needs to be subjected to surface pretreatment, and the specific procedures are as follows: 1) and (3) concave cutting treatment: when a fatigue layer and local seriously-strained groove marks exist on the surface, turning can be carried out on the premise of allowing the strength, so that an accommodating space is provided for thermal spraying; 2) surface cleaning: removing oil stain, rust, paint layer and the like on the surface of the workpiece to clean the surface of the workpiece, removing oil stain paint by using a solvent cleaning agent, heating and removing the oil stain paint by using flame if the oil stain permeates into a base material, and performing acid leaching, mechanical polishing or sand blasting on the rust layer; 3) surface plate forming: grinding the plate shape required by plate rolling; 4) surface treatment: carrying out sand blasting treatment on the surface of the hot roller; 5) surface preheating: the hot roll surface to be coated is preheated. And after the pretreatment is finished, carrying out supersonic spraying, thereby finishing the repair of the roller surface of the roller. In this way, the repaired hot roller can be on-line operated again, but because the surface bonding strength and the wear resistance of the spray coating are insufficient, the roller surface can be partially galling after the hot roller is on-line operated for 15 to 18 hours again, so that the product is unqualified, and the hot roller needs to be off-line and repaired again.
Disclosure of Invention
The invention aims to solve the problem of providing a pretreatment method for repairing the supersonic spraying surface of a hot roller, which can obtain a supersonic spraying layer with high bonding strength and super-strong wear resistance, thereby prolonging the service life of the roller and reducing the production cost.
The invention discloses a pretreatment method for repairing supersonic spraying surface of a hot roller, which comprises the following specific steps: 1) performing concave cutting treatment; 2) cleaning the surface; 3) the surface is provided with a plate shape; 4) the method comprises the following steps of surface roughening, wherein the surface roughening specifically comprises the following steps:
(1) one-step sand blasting to form approximate vertical bar-shaped patterns
Installing a hot roll to be sprayed on a sand blasting bed to rotate, and aligning a sand blasting gun to a part of the roll to be sprayed to perform sand blasting to form approximate vertical bar-shaped patterns surrounding the circumferential surface of the roll, wherein the approximate vertical bar-shaped patterns are distributed at equal intervals, and the roughness is controlled between Ra2.5 and Ra3.2;
(2) secondary sand blasting
Stopping the roller from rotating, fixing the two sample plates on the surface of the roller subjected to primary sand blasting, enabling the right end surfaces of the two sample plates to be flush with the right end surface of the part of the roller needing to be sprayed, manually rotating the roller, and carrying out sand blasting along a spiral gap between the two sample plates by a sand blasting gun, wherein the roughness is controlled to be between Ra5.5 and Ra6.5; carrying out sand blasting for n times according to the method, wherein n is the number of equally divided sections of the circumference of the part of the roller needing to be sprayed;
(3) three-time sand blasting
Turning over the two sample plates and fixing the two sample plates on the surface of the roller subjected to secondary sand blasting, enabling the left end surfaces of the two sample plates to be flush with the left end surface of the part of the roller needing to be sprayed, manually rotating the roller, and carrying out sand blasting by a sand blasting gun along a spiral gap between the two sample plates, wherein the roughness is controlled to be Ra5.5-Ra6.5; carrying out sand blasting for n times according to the method, wherein n is the number of equally divided sections of the circumference of the part of the roller needing to be sprayed;
(4) hot roll preheating
The fresh surface after surface roughening is required to prevent pollution, the roller to be sprayed is placed in a heating cover to be preheated for 1 hour at the temperature of 180 ℃ and 200 ℃ strictly without touching with hands.
Further, in the step (1), the roller rotates at a speed of 25-30r.p.m, and the sand blasting gun travels left and right from one end to the other end of the surface to be painted at a speed of 100mm.p.m along the axial direction.
Furthermore, the template is made of soft materials, the shape of the template is manufactured according to the related method, and the template is fixed on the surface of the roller.
Furthermore, the two templates are parallelograms with the same shape and size, the manufacturing method comprises the steps of ① determining relevant parameters, determining α, n and c, wherein α is arctg b/a, α is a complementary angle of an included angle between a long side and a short side, namely a spiral angle (a is the length of a roller of a section needing spraying, b is the surface perimeter of the roller of the section needing spraying, n is the number of the equally divided sections of the circumference of the roller of the section needing spraying, c is the width of one-time sand blasting, namely the width of a spiral gap), ② blanking, namely, blanking of a lower parallelogram plate, wherein the L of the long side of the lower parallelogram plate is L, and the L of the long side of the lower parallelogram plate1 2＝a2+b2Short side L of2＝b÷n－c÷cosα。
Further, the secondary blasting in step (2) comprises the specific steps of ① marking points on two end surfaces of the roller which is subjected to primary blasting for equally dividing the circumference n, ② aligning the right end surface of the first sample plate with the right end surface of the roller surface and aligning the upper right A point of the sample plate with an equally divided point on the circumference, ③ aligning the right end surface of the second sample plate with the right end surface of the roller surface and aligning the upper right A point of the sample plate with an equally divided point which is adjacent to the equally divided point of the first sample plate, so that a spiral gap with the width of c is formed between the two sample plates, ④ blasting the spiral gap with a blasting gun, ⑤ removing the first sample plate, and repeating steps ③ and ④ until n spiral gaps are blasted, wherein step (3) is the same as the specific blasting method in step (2).
Further, the sequence of the step (2) and the step (3) can be interchanged, the spiral gaps in the step (2) and the step (3) are opposite in rotation direction, one is left-handed, and the other is right-handed.
Further, whenWhen the length a and the width b of the hot roller to be sprayed are 2000mm and 2669mm (d is 850), the circumference of the roller is equally divided into 8 sections, and the long side L in the sample plate13335mm, short side L2The helix angle, i.e. the complementary angle α of the angle between the long side and the short side, was 250.545mm, the width of the helical gap was 50mm, after blasting, 8 helical lines of each of the left-hand and right-hand turns were obtained, forming a diamond pattern.
Further, the sand material in the step (1) is medium corundum sand.
Further, the sand material in the steps (2) and (3) is selected from alloy particles, the microhardness of the alloy particles is larger than HV350, and the particle size ranges from 10 microns to 50 microns.
Furthermore, the sand material alloy particles in the steps (2) and (3) are one or a mixture of more of chromium alloy, tungsten alloy, iron alloy, tantalum alloy and amorphous alloy.
Compared with the prior art, the invention makes a brand-new design on the surface roughening of 4) of the supersonic spraying process: firstly, directly blasting sand to form approximate vertical bar-shaped patterns on the surface of a plate-shaped roller required by rolling a ground plate, wherein the roughness is controlled to be Ra2.5-Ra3.2, then blasting sand to form a plurality of left spiral lines and a plurality of right spiral lines on the pattern patterns, namely blasting sand to form diamond patterns on the approximate vertical bar-shaped pattern patterns, and the roughness is controlled to be Ra5.5-Ra6.5. The patterns in the invention are combined together to form a honeycomb basic framework, so that after the supersonic spraying is carried out, the bonding strength of the coating and the matrix is greatly enhanced, and a stronger anti-wear effect can be achieved. Therefore, the invention solves the problem that the surface of the roller repaired at present is not wear-resistant, and can obtain the supersonic speed spraying layer with high bonding strength and super-strong wear resistance, thereby prolonging the service life of the roller and reducing the production cost.
The invention carries out primary sand blasting on the surface of the whole pre-spraying roller and then carries out sand blasting of diamond patterns on the basis, so that the surface hardness of the whole pre-spraying roller is uniform; the prior art does not form a pattern framework in sand blasting, so that a sprayed layer cannot have enough wear resistance, local parts are easy to wear and certain parts are not worn, but the whole roller is required to be repaired again, and time and materials are greatly wasted. Meanwhile, when the diamond pattern on the outermost layer is subjected to rolling impact force, the impact force can be dispersed to the periphery along the diamond edge, so that the impact force is reduced, and the whole service life of the roller is prolonged.
Drawings
FIG. 1 is a flow chart of the hot roll supersonic spray surface repair pretreatment method of the present invention;
FIG. 2 is a schematic view of a hot roll of the present invention;
FIG. 3 is an expanded view of an approximate vertical stripe pattern of the present invention after one shot blasting of the roll surface;
FIG. 4 is an expanded view of the pattern after three sandblasting operations of the roll surface of the present invention;
FIG. 5 is a schematic view of the development of two templates on a roll in accordance with the present invention;
FIG. 6 is a schematic view showing the arrangement of the sample plates (from the roll end surface) in the secondary blasting or the tertiary blasting according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example 1
As shown in fig. 1, fig. 2, fig. 3 and fig. 4, the pretreatment method for supersonic spraying surface repair of a hot roll comprises the following specific steps: 1) and (3) concave cutting treatment: when a fatigue layer and local seriously-strained groove marks exist on the surface, turning can be carried out on the premise of allowing the strength, so that an accommodating space is provided for thermal spraying; 2) surface cleaning: removing oil stain, rust, paint layer and the like on the surface of the workpiece to clean the surface of the workpiece, removing oil stain paint by using a solvent cleaning agent, heating and removing the oil stain paint by using flame if the oil stain permeates into a base material, and performing acid leaching, mechanical polishing or sand blasting on the rust layer; 3) the surface is provided with a plate shape; 4) the method comprises the following steps of surface roughening, wherein the surface roughening specifically comprises the following steps:
(1) one-step sand blasting to form approximate vertical bar-shaped patterns
Installing a hot roll to be sprayed on a sand blasting bed to rotate, and aligning a sand blasting gun to a part of the roll to be sprayed to perform sand blasting to form approximate vertical bar-shaped patterns surrounding the circumferential surface of the roll, wherein the approximate vertical bar-shaped patterns are distributed at equal intervals, and the roughness is controlled between Ra2.5 and Ra3.2;
(2) secondary sand blasting
Stopping the roller from rotating, fixing the two sample plates on the surface of the roller subjected to primary sand blasting, enabling the right end surfaces of the two sample plates to be flush with the right end surface of the part of the roller needing to be sprayed, manually rotating the roller, and carrying out sand blasting along a spiral gap between the two sample plates by a sand blasting gun, wherein the roughness is controlled to be between Ra5.5 and Ra6.5; carrying out sand blasting for n times according to the method, wherein n is the number of equally divided sections of the circumference of the part of the roller needing to be sprayed;
(3) three-time sand blasting
Turning over the two sample plates and fixing the two sample plates on the surface of the roller subjected to secondary sand blasting, enabling the left end surfaces of the two sample plates to be flush with the left end surface of the part of the roller needing to be sprayed, manually rotating the roller, and carrying out sand blasting by a sand blasting gun along a spiral gap between the two sample plates, wherein the roughness is controlled to be Ra5.5-Ra6.5; carrying out sand blasting for n times according to the method, wherein n is the number of equally divided sections of the circumference of the part of the roller needing to be sprayed;
(4) hot roll preheating
The fresh surface after surface roughening is required to prevent pollution, the roller to be sprayed is placed in a heating cover to be preheated for 1 hour at the temperature of 180 ℃ and 200 ℃ strictly without touching with hands.
The pretreatment method of the invention comprises the following steps: firstly, sand blasting is carried out on the surface 20 (with the length being a and the diameter being d) of the hot roll 10 to be treated to form an approximate vertical bar pattern 30, then, sand blasting is carried out for the second time to form a plurality of spiral patterns 41, and then, sand blasting is carried out for the third time to form a plurality of spiral patterns 42, so that the patterns shown in figure 4 are obtained, and then, a honeycomb-shaped basic framework is formed. The honeycomb-shaped basic structure enables the spraying layer and the roller matrix to have good bonding performance, greatly increases the bonding strength and greatly improves the wear resistance of the spraying layer.
Example 2
In step (1), the preferred speeds are: the roller rotates at a speed of 25-30r.p.m, and the sand blasting gun moves left and right from one end of the surface to be sprayed to the other end of the surface to be sprayed at a speed of 100 mm.p.m.
The speed in the step (1) can be adjusted to obtain the approximately vertical stripe-shaped pattern.
Example 3
The template is made of soft materials, the shape of the template is manufactured according to a related method, and the template is fixed on the surface of the roller.
Example 4
As shown in FIG. 5, the two templates are parallelograms with the same shape and size, and the manufacturing method comprises the steps of ① determining relevant parameters, determining α, n and c, wherein α is arctg b/a, α is a complementary angle of an included angle between a long side and a short side, namely a spiral angle (a is the length of a roller of a section needing spraying, b is the surface perimeter of the roller of the section needing spraying, pi d), n is the number of sections of the circumference of the roller of the section needing spraying, c is the width of one-time sand blasting, namely the width of a spiral gap, ② blanking, namely, blanking of a lower parallelogram plate, wherein the long side L of the lower parallelogram plate is provided with L-shaped long sides1 2＝a2+b2Short side L of2＝b÷n－c÷cosα。
When the sample plate is fixed on the surface of the hot roll, a spiral gap is formed between the two sample plates, the angle α is a spiral angle, when the thread on the sample plate is a left-handed thread, the left end surface of the sample plate is flush with the left end surface of the section of the roll needing spraying, and when the thread on the sample plate is a right-handed thread, the right end surface of the sample plate is flush with the right end surface of the section of the roll needing spraying.
Where n is preferably 8-12, and when d > 800mm, at least 8, i.e. the distance between the spirals formed by sandblasting must not be too great, as the bond strength will be affected, and generally the distance between the spirals L2 × cos α is approximately equal to 3 c.
Example 5
The secondary blasting of step (2) comprises the specific steps of ① marking points which divide the circumference into n equal parts on two end surfaces of the roller which is subjected to primary blasting, ② aligning the right end surface of the first sample plate with the right end surface of the roller surface and aligning the upper right A point of the sample plate with an equant point on the circumference, ③ aligning the right end surface of the second sample plate with the right end surface of the roller surface and aligning the upper right A point of the sample plate with the equant point which is adjacent to the equant point of the first sample plate, so that a spiral gap with the width of c is formed between the two sample plates, ④ blasting the spiral gap with a blasting gun, ⑤ removing the first sample plate, and repeating the steps ③ and ④ until n spiral gaps are blasted, and the step (3) is the same as the specific blasting method of step (2), wherein the sample plate 50 is shown in fig. 5 and 6.
Wherein, the sequence of the step (2) and the step (3) can be interchanged, the spiral directions of the spiral gaps in the step (2) and the step (3) are opposite, one is left-handed, and the other is right-handed.
After the secondary sand blasting and the third sand blasting are finished, a diamond pattern is blasted on the surface of the roller which is similar to the vertical stripe pattern, so that the honeycomb base framework is formed.
Example 6
One specific example is as follows:
when the length a of the hot roller to be sprayed is 2000mm and the width b thereof is 2669mm (d is 850), the circumference of the roller is equally divided into 8 segments, and the long side L in the sample plate13335mm, short side L2The helix angle, i.e. the complementary angle α of the angle between the long side and the short side, was 250.55mm, the width of the helical gap was 50mm, after blasting, 8 helical lines of each of the left-hand and right-hand turns were obtained, forming a diamond pattern.
Example 7
The sand material in the step (1) is medium corundum sand.
And (3) selecting alloy particles from the sand material in the steps (2) and (3), wherein the microhardness of the alloy particles is greater than HV350, and the particle size range is 10-50 microns.
The sand material alloy particles in the steps (2) and (3) are one or a mixture of more of chromium alloy, tungsten alloy, iron alloy, tantalum alloy and amorphous alloy.
The proper pressure is selected during sand blasting to meet the requirement of corresponding roughness.
The performance test of the roller after the pretreatment and the spraying is finished, the specific data are shown in the following table 1:
TABLE 1 coating Performance parameters
| Unit of | 1# | 2# | 3# | |
| One-time sand blasting (vertical bar pattern) | μm | 2.6 | 3.1 | 3.1 |
| Two and three times sand blasting (Diamond pattern) | μm | 5.6 | 6.3 | 6.3 |
| Thickness of coating | mm | 1.00 | 1.20 | 1.20 |
| Bonding strength | MPa | 58.00 | 60.00 | 61.00 |
| Surface hardness | HS | 81.50 | 85.20 | 87.10 |
From the data in the table, when the thickness of the supersonic spraying layer is set to be more than 1mm, the composite ceramic material powder is selected to be thermally sprayed on the surface of the roller to be repaired, the bonding strength of the spraying layer and the roller matrix is more than 58MPa, and the hardness is more than HS 81.5.
The time and tonnage of the hot-rolled spray roll obtained after the surface repair pretreatment by the method of the invention are compared with those of the hot-rolled spray roll without the treatment by the method of the invention in the condition of the same thickness of coating, and are shown in the following table 2:
TABLE 2 Rolling time and tonnage of sheet before and after improvement
| Working hours (hours) | Rolled steel excess (ton) | |
| Without spray coating treatment | 3-3.5 | 1000 |
| Prior art spray coating process | 15-18 | 4500 |
| Is treated by spraying according to the invention | 20-23 | 5500 |
As can be seen from the data in the table, the time of the roller which is improved by the invention for rolling the plate is averagely improved by 28 percent, the rolled steel passing amount is also improved by 22 percent, and the service life of the roller is greatly prolonged.
Compared with the prior art, the method of the invention sprays a plurality of right-handed spiral lines and a plurality of left-handed spiral lines on the surface of the approximately vertical stripe-shaped pattern, namely, the method is equivalent to spray a diamond pattern on the surface of the approximately vertical stripe-shaped pattern to form a honeycomb-shaped basic framework, so that the bonding performance of the spraying layer and the roller matrix is good, the bonding strength is greatly increased, and the wear resistance of the spraying layer is greatly improved. When the thickness of the supersonic spraying layer is more than 1mm, the composite ceramic material powder is selected to be thermally sprayed on the surface of the roller to be repaired, the bonding strength of the spraying layer and the roller matrix is more than 58MPa, the hardness is more than HS81.5, the relative wear resistance is more than 5 times of that of the base material GCr15Si2Mn steel, and the service life of the roller can be improved by more than 5.5 times compared with the roller without the spraying layer.
Claims (10)
1. The pretreatment method for repairing the supersonic spraying surface of the hot roller comprises the following specific steps: 1) performing concave cutting treatment; 2) cleaning the surface; 3) the surface is provided with a plate shape; 4) the method comprises the following steps of surface roughening, wherein the surface roughening specifically comprises the following steps:
(1) one-step sand blasting to form approximate vertical bar-shaped patterns
Installing a hot roll to be sprayed on a sand blasting bed to rotate, and aligning a sand blasting gun to a part of the roll to be sprayed to perform sand blasting to form approximate vertical bar-shaped patterns surrounding the circumferential surface of the roll, wherein the approximate vertical bar-shaped patterns are distributed at equal intervals, and the roughness is controlled between Ra2.5 and Ra3.2;
(2) secondary sand blasting
Stopping the roller from rotating, fixing the two sample plates on the surface of the roller subjected to primary sand blasting, enabling the right end surfaces of the two sample plates to be flush with the right end surface of the part of the roller needing to be sprayed, manually rotating the roller, and carrying out sand blasting along a spiral gap between the two sample plates by a sand blasting gun, wherein the roughness is controlled to be between Ra5.5 and Ra6.5; carrying out sand blasting for n times according to the method, wherein n is the number of equally divided sections of the circumference of the part of the roller needing to be sprayed;
(3) three-time sand blasting
Turning over the two sample plates and fixing the two sample plates on the surface of the roller subjected to secondary sand blasting, enabling the left end surfaces of the two sample plates to be flush with the left end surface of the part of the roller needing to be sprayed, manually rotating the roller, and carrying out sand blasting by a sand blasting gun along a spiral gap between the two sample plates, wherein the roughness is controlled to be Ra5.5-Ra6.5; carrying out sand blasting for n times according to the method, wherein n is the number of equally divided sections of the circumference of the part of the roller needing to be sprayed;
(4) hot roll preheating
The fresh surface after surface roughening is required to prevent pollution, the roller to be sprayed is placed in a heating cover to be preheated for 1 hour at the temperature of 180 ℃ and 200 ℃ strictly without touching with hands.
2. The pretreatment method for the repair of the supersonic spray surface of a hot roll according to claim 1, wherein: in the step (1), the roller rotates at a speed of 25-30r.p.m, and the sand blasting gun axially moves from one end of the surface to be sprayed to the other end at a speed of 100 mmpm.
3. The pretreatment method for the repair of the supersonic spray surface of a hot roll according to claim 1, wherein: the template is made of soft materials, the shape of the template is manufactured according to a related method, and the template is fixed on the surface of the roller.
4. The pretreatment method for the supersonic spray surface repair of hot roller according to claim 1, wherein the two templates are parallelograms with the same shape and size, and the preparation method comprises ① determining relevant parameters, that is, determining α, n and c, α -arctg b/a and α are complementary angles of the included angle between the long side and the short side, that is, helix angle, wherein a is the length of the roller needing the spray segment, b is the surface perimeter of the roller needing the spray segment, n-pi d, the roller perimeter of the roller needing the spray segment, and the likeThe number of the divided sections is c is the width of one-time sand blasting, namely the width of the spiral gap, ② blanking is carried out, the long side L of the lower parallelogram plate is1 2＝a2+b2Short side L thereof2＝b÷n－c÷cosα。
5. The pretreatment method for repairing the supersonic sprayed surface of a hot roller according to claim 1, wherein the secondary blasting of step (2) comprises the steps of firstly scribing ① points on both end surfaces of the roller which has been subjected to the primary blasting, equally dividing the circumference by n, aligning ② the right end surface of the first pattern plate with the right end surface of the roller surface and aligning the upper right A point of the first pattern plate with an equally divided point on the circumference, ③ the right end surface of the second pattern plate with the right end surface of the roller surface and aligning the upper right A point of the second pattern plate with an equally divided point which is adjacent to the equally divided point of the first pattern plate, so that a spiral gap having a width of c is formed between the two pattern plates, blasting ④ the spiral gap with a blast gun, removing ⑤ the first pattern plate, repeating steps ③ and ④ until n spiral gaps are blasted, and repeating step (3) as in the specific blasting method of step (2).
6. The pretreatment method for the repair of the supersonic spray surface of a hot roll according to claim 5, wherein: the sequence of the step (2) and the step (3) can be interchanged, the spiral gaps in the step (2) and the step (3) are opposite in rotation direction, one is left-handed, and the other is right-handed.
7. The pretreatment method for the repair of the supersonic spray surface of a hot roll according to claim 5, wherein: when the length a of the hot roller to be sprayed is 2000mm and the width b thereof is 2669mm (d is 850), the circumference of the roller is equally divided into 8 segments, and the long side L in the sample plate13335mm, short side L2The helix angle, i.e. the complementary angle α of the angle between the long side and the short side, was 250.545mm, the width of the helical gap was 50mm, after blasting, 8 helical lines of each of the left-hand and right-hand turns were obtained, forming a diamond pattern.
8. The pretreatment method for the repair of the supersonic spray surface of a hot roll according to claim 1, wherein: the sand material for sand blasting in the step (1) is medium corundum sand.
9. The pretreatment method for the repair of the supersonic spray surface of a hot roll according to claim 1, wherein: and (3) selecting alloy particles from the sand for sand blasting in the steps (2) and (3), wherein the microhardness of the alloy particles is greater than HV350, and the particle size range is 10-50 microns.
10. The method of pretreatment for the repair of supersonic spray surface of hot roll according to claim 9, characterized in that: the alloy particles in the steps (2) and (3) are one or a mixture of more of chromium alloy, tungsten alloy, iron alloy, tantalum alloy and amorphous alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810872086.5A CN108842127B (en) | 2018-08-02 | 2018-08-02 | Pretreatment method for repairing supersonic spraying surface of hot roller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810872086.5A CN108842127B (en) | 2018-08-02 | 2018-08-02 | Pretreatment method for repairing supersonic spraying surface of hot roller |
Publications (2)
| Publication Number | Publication Date |
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| CN108842127A CN108842127A (en) | 2018-11-20 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103173713A (en) * | 2013-03-21 | 2013-06-26 | 马鞍山市恒意机械有限公司 | Supersonic spray process for shaped roll pass made of semisteel |
| CN104152841A (en) * | 2014-07-21 | 2014-11-19 | 江苏南山冶金机械制造有限公司 | Surface treatment process for carbon coated roller core |
| CN104451529A (en) * | 2014-12-09 | 2015-03-25 | 马鞍山市恒意机械有限公司 | Repairing pretreatment method for supersonic flame spraying surface of roller |
| CN105755419A (en) * | 2014-12-13 | 2016-07-13 | 重庆迎瑞升压铸有限公司 | Flame spraying technology |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103173713A (en) * | 2013-03-21 | 2013-06-26 | 马鞍山市恒意机械有限公司 | Supersonic spray process for shaped roll pass made of semisteel |
| CN104152841A (en) * | 2014-07-21 | 2014-11-19 | 江苏南山冶金机械制造有限公司 | Surface treatment process for carbon coated roller core |
| CN104451529A (en) * | 2014-12-09 | 2015-03-25 | 马鞍山市恒意机械有限公司 | Repairing pretreatment method for supersonic flame spraying surface of roller |
| CN105755419A (en) * | 2014-12-13 | 2016-07-13 | 重庆迎瑞升压铸有限公司 | Flame spraying technology |
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