CN115609237A - Processing method of high-hardness circular arc plate - Google Patents
Processing method of high-hardness circular arc plate Download PDFInfo
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Abstract
A method for processing a high-hardness circular arc plate comprises the following steps: firstly, annealing a blank flat steel plate and rolling the blank flat steel plate into a steel cylinder, welding tool flanges at two ends of the steel cylinder to obtain a process cylinder, then roughly processing and annealing the process cylinder to eliminate welding stress, turning and cutting the process cylinder into a semi-ring cylinder, releasing internal stress to obtain a supporting semi-ring cylinder, finally welding supports at two ends of the supporting semi-ring cylinder, and performing quenching, correcting and cutting on the supports to obtain a high-hardness arc plate; in application, the design improves the surface hardness of the steel coil, fully releases the internal stress of the steel coil and reasonably controls the deformation. Therefore, the invention not only is easy to process, but also is not easy to deform.
Description
Technical Field
The invention relates to a processing method, belongs to the field of part processing, and particularly relates to a processing method of a high-hardness circular arc plate.
Background
A certain ship type needs to use a high-hardness circular arc plate to form a track plate similar to a runway as a use support; according to the product design requirement, the arc plate needs to meet the characteristics of thin wall, high precision and high hardness, meanwhile, the bolt mounting holes are uniformly distributed in the periphery of the arc plate, the position of the bolt hole is also required to be higher, and the arc plate belongs to thin-wall parts with higher processing difficulty.
The invention application with the application number of 201310711370.1 and the application date of 2013, 12 months and 20 days discloses a forming method of a coiled arc wing, which mainly comprises the steps of arc plate forming, coiled arc wing welding forming, thermal refining and shape correction, and the step of welding forming, wherein the structural forming is completed by using methods of scribing segmented brake pressing, pre-welding reserve, ordered limiting welding and the like; and (3) quenching and tempering, namely reducing quenching deformation of the rolling arc wing by using a local constraint and vacuum heat treatment method and ensuring the strength requirement.
Because the requirement on the hardness of the part is high, the hardness of the part needs to be improved by adopting a heat treatment quenching process, and the traditional processing method has the following defects: after the surface hardness of the workpiece is improved, the machining process is difficult, and the workpiece is easy to have serious deformation and cannot meet the use requirement.
The information disclosed in this background section is only for enhancement of understanding of the general background of the application and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to overcome the defects and problems that a high-hardness workpiece is difficult to process and is easy to deform in the prior art, and provides a processing method of a high-hardness arc plate, which is easy to process the high-hardness workpiece and is difficult to deform.
In order to achieve the above purpose, the technical solution of the invention is as follows: a method for processing a high-hardness circular arc plate comprises the following steps:
step one, annealing a blank flat steel plate, rolling the blank flat steel plate into a steel cylinder, and then respectively welding tool flanges at two ends of the steel cylinder to obtain a process cylinder;
step two, roughly machining the inner arc surface and the outer arc surface of the process cylinder;
annealing the process cylinder to release internal stress;
step four, machining a threaded through hole on the outer arc surface of the process cylinder, and turning the inner arc surface and the outer arc surface of the process cylinder to a prefabricated size;
step five, cutting the process cylinder into a semi-ring cylinder along the axis of the process cylinder, and releasing the internal stress;
welding supports between two ends of the half tooling flange on the top surface of the half-ring cylinder and between two ends of the half tooling flange on the bottom surface of the half-ring cylinder to obtain a supported half-ring cylinder;
step seven, quenching the supporting semi-ring cylinder;
eighthly, removing the half tooling flanges at two ends of the supporting half ring cylinder to obtain a half ring arc plate, and then correcting the half ring arc plate;
and step nine, cutting the semi-ring arc plate into the required arc plate size according to the requirement, finishing the processing and obtaining the high-hardness arc plate.
In the first step, the annealing treatment comprises the following steps: firstly, placing a blank flat steel plate into a heating device with the temperature of 20-300 ℃, then raising the temperature of the heating device to 790-810 ℃, preserving heat for 3-5 hours, then lowering the temperature of the heating device to 700-720 ℃, preserving heat for 5-7 hours, finally lowering the temperature of the heating device to be less than or equal to 350 ℃, taking out the blank flat steel plate, and finishing annealing treatment.
In the first step, after the steel cylinder is rolled into the steel cylinder, the steel cylinder needs to be corrected and polished into a cylinder without obvious deformation, and then tool flanges are respectively welded at two ends of the steel cylinder to obtain the process cylinder.
In the second step, the rough machining means: turning the inner arc surface and the outer arc surface of the process cylinder until no obvious visible gap, no obvious corrosion and metallic luster are formed on the surfaces of the inner arc surface and the outer arc surface.
In the third step, the annealing treatment comprises the following steps: firstly, placing the process cylinder into a heating device with the temperature of 20-300 ℃, then raising the temperature of the heating device to 570-590 ℃, preserving the heat for 5-7 hours, then taking out the process cylinder after reducing the temperature of the heating device to be less than or equal to 300 ℃, and finishing the annealing treatment.
In the fourth step, the prefabricated size is as follows: on the basis of the required size of the arc plate, the machining allowance of the inner arc surface, the outer arc surface and the threaded through hole of the process cylinder is reserved.
In the fifth step, the releasing the internal stress refers to: and naturally placing the semi-circular cylinder for 3-5 days.
In the seventh step, the quenching treatment comprises the following steps: firstly, placing a support semi-ring cylinder into a heating chamber, vacuumizing the heating chamber to be less than or equal to 0.067Pa, then heating the heating chamber to 850-870 ℃, preserving heat for more than or equal to 2 hours, after the heat preservation is finished, moving the support semi-ring cylinder into a quenching chamber for quenching, wherein the quenching oil temperature is 20-80 ℃, and after the quenching time is more than or equal to 20 minutes, taking out the support semi-ring cylinder to finish the quenching treatment;
the operation before the supporting semi-ring cylinder is moved into the quenching chamber for quenching is as follows: vacuumizing the quenching chamber to less than or equal to 0.067Pa, and filling nitrogen into the quenching chamber until the vacuum degree of the quenching chamber rises to 1 × 104 Pa-5 × 104Pa, and then stopping filling nitrogen.
In the step eight, the step of correcting the semi-ring arc plate refers to: and turning and correcting the outer arc surface and the inner arc surface of the semi-ring arc plate to the radian and the thickness required by the molded part.
In the fifth step and the ninth step, the cutting mode is as follows: and (6) wire cutting.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention relates to a processing method of a high-hardness arc plate, which comprises the steps of firstly annealing a blank flat steel plate and rolling the blank flat steel plate into a steel cylinder, welding tool flanges at two ends of the steel cylinder to obtain a process cylinder, then carrying out rough machining and annealing treatment on the process cylinder to eliminate welding stress, turning and cutting the process cylinder into a semi-ring cylinder, releasing internal stress to obtain a supporting semi-ring cylinder, finally welding supports at two ends of the supporting semi-ring cylinder, and carrying out quenching treatment, correction and cutting on the semi-ring cylinder to obtain the high-hardness arc plate; in application, the design fully releases the internal stress of the steel coil while improving the surface hardness of the steel coil, and reasonably controls the deformation. Therefore, the invention not only is easy to process, but also is not easy to deform.
2. In the processing method of the high-hardness arc plate, firstly, a blank flat steel plate is annealed and then rolled into a steel cylinder to obtain a process cylinder, and the annealing treatment on the blank steel plate is to reduce the hardness of the blank steel plate, eliminate the residual stress generated in the rolling and cooling processes of the blank steel plate, prevent the blank steel plate from cracking in the rolling process and facilitate subsequent processing; and then annealing treatment is carried out again after the process cylinder is roughly processed, in order to eliminate stress generated during welding, through the annealing treatment of front-to-back connection, the metal stress before and after the steel plate is coiled is greatly eliminated, and excessive deformation is prevented from being generated in subsequent processing.
3. The invention relates to a processing method of a high-hardness arc plate, which comprises the steps of placing a support semi-ring cylinder into a heating chamber, carrying out vacuumizing, heating and heat preservation treatment, then placing the support semi-ring cylinder into the heating chamber for quenching, and finishing quenching treatment; the design is used for carrying out vacuum quenching in application, so that the workpiece is not contacted with air, and the workpiece is prevented from being oxidized in the air to influence the performance and the appearance of the workpiece. Therefore, the invention not only is easy to process, but also can meet the requirements of workpieces.
Drawings
FIG. 1 is a schematic diagram of the construction of a process cylinder according to the present invention.
Fig. 2 is a schematic structural view of a half-ring cylinder according to the present invention.
Fig. 3 is a top view of the support half-ring cylinder of the present invention.
Fig. 4 is a schematic structural view of the half-ring arc plate of the present invention.
In the figure: a process cylinder 1, a semi-ring cylinder 2, a supporting semi-ring cylinder 3, a semi-ring arc plate 4 tool flange 5, screw through hole 6, support 7, half tool flange 8.
Detailed Description
The invention is described in further detail below with reference to the figures and the detailed description of the invention.
Referring to fig. 1 to 4, a method for processing a high-hardness circular arc plate includes the following steps:
step one, annealing a blank flat steel plate, rolling the blank flat steel plate into a steel cylinder, and then respectively welding tooling flanges 5 at two ends of the steel cylinder to obtain a process cylinder 1;
secondly, roughly machining the inner arc surface and the outer arc surface of the process cylinder 1;
step three, annealing the process cylinder 1 to release internal stress;
step four, machining a threaded through hole 6 on the outer arc surface of the process cylinder 1, and turning the inner arc surface and the outer arc surface of the process cylinder 1 to a prefabricated size;
step five, cutting the process cylinder 1 into a semi-ring cylinder 2 along the axis of the process cylinder, and releasing the internal stress;
sixthly, welding supports 7 between two ends of the half tooling flange 8 on the top surface of the semi-ring cylinder 2 and between two ends of the half tooling flange 8 on the bottom surface of the semi-ring cylinder 2 to obtain a supported semi-ring cylinder 3;
seventhly, quenching the supporting semi-ring cylinder 3;
eighthly, removing the half tooling flanges 8 at two ends of the supporting half ring cylinder 3 to obtain a half ring arc plate 4, and then correcting the half ring arc plate 4;
and step nine, cutting the semi-ring arc plate 4 into the required arc plate size according to requirements, and finishing processing to obtain the high-hardness arc plate.
In the first step, the annealing treatment comprises the following steps: firstly, placing a blank flat steel plate into a heating device with the temperature of 20-300 ℃, then raising the temperature of the heating device to 790-810 ℃, preserving heat for 3-5 hours, then lowering the temperature of the heating device to 700-720 ℃, preserving heat for 5-7 hours, finally lowering the temperature of the heating device to be less than or equal to 350 ℃, taking out the blank flat steel plate, and finishing annealing treatment.
In the first step, after the steel cylinder is rolled into a steel cylinder, the steel cylinder needs to be corrected and polished into a cylinder without obvious deformation, and then the tooling flanges 5 are respectively welded at the two ends of the steel cylinder to obtain the process cylinder 1.
In the second step, the rough machining means: turning the inner arc surface and the outer arc surface of the process cylinder 1 until the surfaces of the inner arc surface and the outer arc surface have no obvious visible gap, no obvious corrosion and visible metallic luster.
In the third step, the annealing treatment comprises the following steps: firstly, the process cylinder 1 is placed into a heating device with the temperature of 20 ℃ to 300 ℃, then the temperature of the heating device is increased to 570 ℃ to 590 ℃, the temperature is preserved for 5 to 7 hours, then the temperature of the heating device is reduced to be less than or equal to 300 ℃, and then the process cylinder 1 is taken out to finish the annealing treatment.
In the fourth step, the prefabricated size is as follows: and on the basis of the required size of the arc plate, the machining allowance of the inner arc surface, the outer arc surface and the threaded through hole of the process cylinder 1 is reserved.
In the fifth step, the releasing of the internal stress refers to: the semi-circular cylinder 2 is naturally placed for 3 to 5 days.
In the seventh step, the quenching treatment comprises the following steps: firstly, placing a support semi-ring cylinder 3 into a heating chamber, vacuumizing the heating chamber to be less than or equal to 0.067Pa, then heating the heating chamber to 850-870 ℃, preserving heat for more than or equal to 2 hours, after the heat preservation is finished, moving the support semi-ring cylinder 3 into a quenching chamber for quenching, wherein the quenching oil temperature is 20-80 ℃, and the quenching time is more than or equal to 20 minutes, then taking out the support semi-ring cylinder to finish the quenching treatment;
the operation before the support semi-ring cylinder 3 is moved into the quenching chamber for quenching is as follows: and vacuumizing the quenching chamber to be less than or equal to 0.067Pa, and filling nitrogen into the quenching chamber until the vacuum degree of the quenching chamber is increased to 1 × 104 Pa-5 × 104Pa, and then stopping filling nitrogen.
In the step eight, the step of correcting the semi-ring arc plate 4 includes: and turning and correcting the outer arc surface and the inner arc surface of the semi-ring arc plate 4 to the radian and the thickness required by the molded part.
In the fifth step and the ninth step, the cutting mode is as follows: and (6) wire cutting.
The principle of the invention is illustrated as follows:
the high-hardness arc plate is divided into a 90-degree arc section and a 180-degree arc section, the inner circle and the outer circle of the arc section are required to be processed, the high-carbon chromium bearing steel is used as a material, the forming wall thickness of a part is 10mm, the maximum outer diameter radius is 439mm, and the hardness requirement is greater than 60HRC acceptance; meanwhile, the high-hardness part has certain difficulty in the machining process, and an appropriate method and a means for controlling deformation are needed.
Example 1:
referring to fig. 1 to 4, a method for processing a high-hardness circular arc plate includes the following steps:
step one, annealing a blank flat steel plate (preferably high-carbon chromium alloy steel) and then rolling the blank flat steel plate into a steel cylinder, and then respectively welding tooling flanges 5 at two ends of the steel cylinder to obtain a process cylinder 1;
preferably, the annealing treatment comprises the following steps: firstly, placing a blank flat steel plate into a heating device with the temperature of 20-300 ℃, then raising the temperature of the heating device to 790-810 ℃, preserving heat for 3-5 hours, then lowering the temperature of the heating device to 700-720 ℃, preserving heat for 5-7 hours, finally lowering the temperature of the heating device to be less than or equal to 350 ℃, taking out the blank flat steel plate, and finishing annealing treatment;
preferably, after the steel cylinder is rolled into a steel cylinder, the steel cylinder needs to be corrected and polished into a cylinder without obvious deformation, and then tool flanges 5 are respectively welded at two ends of the steel cylinder to obtain a process cylinder 1;
step two, roughly machining the inner cambered surface and the outer cambered surface of the technological cylinder 1, and removing the allowance of 1mm;
step three, annealing the process cylinder 1 to release internal stress;
preferably, the annealing treatment comprises the following steps: firstly, placing the process cylinder 1 into a heating device with the temperature of 20-300 ℃, then raising the temperature of the heating device to 570-590 ℃, preserving the heat for 5-7 hours, then taking out the process cylinder 1 after reducing the temperature of the heating device to be less than or equal to 300 ℃, and finishing annealing treatment;
step four, machining a threaded through hole 6 on the outer arc surface of the process cylinder 1, chamfering, turning the inner arc surface and the outer arc surface of the process cylinder 1 to a prefabricated size, and reserving 3mm machining allowance on one side;
step five, cutting the process cylinder 1 into a semi-ring cylinder 2 along the axis of the process cylinder, naturally placing for 3-5 days, and releasing internal stress; (preferably wire cutting)
Sixthly, welding supports 7 between two ends of the half tooling flange 8 on the top surface of the semi-ring cylinder 2 and between two ends of the half tooling flange 8 on the bottom surface of the semi-ring cylinder 2 to obtain a support semi-ring cylinder 3 (preferably, the materials of the supports 7 are consistent with that of the semi-ring cylinder 2);
seventhly, quenching the supporting semi-ring cylinder 3;
eighthly, removing the half tooling flanges 8 at two ends of the supporting semi-ring cylinder 3 to obtain a semi-ring arc plate 4, and then correcting the semi-ring arc plate 4;
and step nine, cutting the semi-ring arc plate 4 into the required arc plate size according to requirements, and finishing processing to obtain a high-hardness arc plate (preferably linear cutting).
Example 2:
the basic contents are the same as example 1, except that:
step seven, quenching the supporting semi-ring cylinder 3;
preferably, the quenching treatment comprises the following steps: firstly, placing a support semi-ring cylinder 3 into a heating chamber, vacuumizing the heating chamber to be less than or equal to 0.067Pa, then heating the heating chamber to 850-870 ℃, preserving heat for more than or equal to 2 hours, after the heat preservation is finished, moving the support semi-ring cylinder 3 into a quenching chamber for quenching, wherein the quenching oil temperature is 20-80 ℃, and the quenching time is more than or equal to 20 minutes, then taking out the support semi-ring cylinder to finish the quenching treatment;
the operation before the support semi-ring cylinder 3 is moved into the quenching chamber for quenching is as follows: vacuumizing the quenching chamber to less than or equal to 0.067Pa, and filling nitrogen into the quenching chamber until the vacuum degree of the quenching chamber rises to 1 × 104 Pa-5 × 104Pa, and then stopping filling nitrogen.
Example 3:
the basic contents are the same as example 1, except that:
seventhly, after quenching treatment is carried out on the support semi-ring cylinder 3, dye inspection is carried out on the inner arc surface and the outer arc surface of the support semi-ring cylinder 3; if the quality is qualified, performing the step eight; if the position is not qualified, repair welding and filling are carried out on the unqualified position; the qualified standard of the dye penetrant inspection is as follows: NB/T47013.5-2015I stage.
Example 4:
the basic contents are the same as example 1, except that:
eighthly, removing the half tooling flanges 8 at two ends of the supporting half-ring cylinder 3 to obtain a half-ring arc plate 4, and then correcting the half-ring arc plate 4 (preferably, processing by adopting a special CBN turning blade);
and step nine, cutting the semi-ring arc plate 4 into a 90-degree arc plate and a 180-degree arc plate according to a required line, and finishing processing to obtain the high-hardness arc plate.
The above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiment, but equivalent modifications or changes made by those skilled in the art according to the present disclosure should be included in the scope of the present invention as set forth in the appended claims.
Claims (10)
1. The processing method of the high-hardness circular arc plate is characterized by comprising the following steps of:
step one, annealing a blank flat steel plate, rolling the blank flat steel plate into a steel cylinder, and then respectively welding tooling flanges (5) at two ends of the steel cylinder to obtain a process cylinder (1);
secondly, roughly machining the inner arc surface and the outer arc surface of the process cylinder (1);
step three, annealing the process cylinder (1) to release internal stress;
step four, machining a threaded through hole (6) on the outer arc surface of the process cylinder (1), and turning the inner arc surface and the outer arc surface of the process cylinder (1) to a prefabricated size;
step five, cutting the process cylinder (1) into a semi-ring cylinder (2) along the axis of the process cylinder, and releasing internal stress;
sixthly, welding supports (7) between two ends of the half tooling flange (8) on the top surface of the semi-ring cylinder (2) and between two ends of the half tooling flange (8) on the bottom surface of the semi-ring cylinder (2) to obtain a supported semi-ring cylinder (3);
seventhly, quenching the support semi-ring cylinder (3);
eighthly, removing the half tooling flanges (8) at two ends of the supporting semi-ring cylinder (3) to obtain a semi-ring arc plate (4), and then correcting the semi-ring arc plate (4);
and step nine, cutting the semi-ring arc plate (4) into the required arc plate size according to the requirement, finishing the processing and obtaining the high-hardness arc plate.
2. The method for processing the high-hardness circular arc plate according to claim 1, wherein the method comprises the following steps:
in the first step, the annealing treatment comprises the following steps: firstly, placing a blank flat steel plate into a heating device with the temperature of 20-300 ℃, then raising the temperature of the heating device to 790-810 ℃, preserving heat for 3-5 hours, then lowering the temperature of the heating device to 700-720 ℃, preserving heat for 5-7 hours, finally lowering the temperature of the heating device to be less than or equal to 350 ℃, taking out the blank flat steel plate, and finishing annealing treatment.
3. The method for processing the high-hardness circular arc plate according to claim 1, wherein the method comprises the following steps:
in the first step, after the steel cylinder is rolled into the steel cylinder, the steel cylinder needs to be corrected and polished to be in a cylindrical shape without obvious deformation, and then tool flanges (5) are respectively welded at two ends of the steel cylinder to obtain the process cylinder (1).
4. The method for processing the high-hardness circular arc plate according to claim 1, wherein the method comprises the following steps:
in the second step, the rough machining means: turning the inner arc surface and the outer arc surface of the process cylinder (1) until the surfaces of the inner arc surface and the outer arc surface have no obvious visible gap, no obvious corrosion and visible metallic luster.
5. The method for processing the high-hardness circular arc plate according to claim 1, wherein the method comprises the following steps:
in the third step, the annealing treatment comprises the following steps: firstly, the process cylinder (1) is placed in a heating device with the temperature of 20-300 ℃, then the temperature of the heating device is increased to 570-590 ℃, the temperature is kept for 5-7 hours, then the temperature of the heating device is reduced to be less than or equal to 300 ℃, and then the process cylinder (1) is taken out to finish the annealing treatment.
6. The method for processing the high-hardness circular arc plate according to claim 1, wherein the method comprises the following steps:
in the fourth step, the pre-manufactured size refers to: on the basis of the required size of the arc plate, the machining allowance of the inner arc surface, the outer arc surface and the threaded through hole of the process cylinder (1) is reserved.
7. The method for processing the high-hardness circular arc plate according to claim 1, wherein the method comprises the following steps:
in the fifth step, the releasing of the internal stress refers to: the semi-circular cylinder (2) is naturally placed for 3 to 5 days.
8. The method for processing the high-hardness circular arc plate according to claim 1, wherein the method comprises the following steps:
in the seventh step, the quenching treatment comprises the following steps: firstly, placing a support semi-ring cylinder (3) into a heating chamber, vacuumizing the heating chamber to be less than or equal to 0.067Pa, then heating the heating chamber to 850-870 ℃, preserving heat for more than or equal to 2 hours, after heat preservation is finished, moving the support semi-ring cylinder (3) into a quenching chamber for quenching, wherein the temperature of quenching oil is 20-80 ℃, and after quenching time is more than or equal to 20 minutes, taking out the support semi-ring cylinder to finish quenching treatment;
the operation before moving the supporting semi-ring cylinder (3) into the quenching chamber for quenching is as follows: vacuumizing the quenching chamber to less than or equal to 0.067Pa, and filling nitrogen into the quenching chamber until the vacuum degree of the quenching chamber rises to 1 × 104 Pa-5 × 104Pa, and then stopping filling nitrogen.
9. The method for processing the high-hardness circular arc plate according to claim 1, wherein the method comprises the following steps:
in the step eight, the step of correcting the semi-ring arc plate (4) comprises the following steps: and turning and correcting the outer arc surface and the inner arc surface of the semi-ring arc plate (4) to the radian and the thickness required by the molded part.
10. The method for processing the high-hardness circular arc plate according to claim 1, wherein the method comprises the following steps:
in the fifth step and the ninth step, the cutting mode is as follows: and (6) wire cutting.
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| CN202211248485.7A CN115609237A (en) | 2022-10-12 | 2022-10-12 | Processing method of high-hardness circular arc plate |
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| CN202211248485.7A CN115609237A (en) | 2022-10-12 | 2022-10-12 | Processing method of high-hardness circular arc plate |
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