CN114227159B - Method for processing austenitic stainless steel special-shaped multi-step hole box body - Google Patents
Method for processing austenitic stainless steel special-shaped multi-step hole box body Download PDFInfo
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- CN114227159B CN114227159B CN202111521071.2A CN202111521071A CN114227159B CN 114227159 B CN114227159 B CN 114227159B CN 202111521071 A CN202111521071 A CN 202111521071A CN 114227159 B CN114227159 B CN 114227159B
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- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
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- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
Abstract
The application provides a method for processing an austenitic stainless steel special-shaped multi-step hole box body, which comprises the following steps: processing a round bar, and performing semi-finishing treatment on the round bar to obtain a pore plate; welding the pore plates, namely butting the pore plates, and then welding to obtain a multi-step pore box blank; and processing a blank, namely processing the multi-step hole box blank to obtain the multi-step hole box. The application provides a method for machining an austenitic stainless steel special-shaped multi-step hole box body, which effectively shortens the manufacturing period of the box body, improves the product quality and reduces the manufacturing cost.
Description
Technical Field
The application relates to the technical field of machining, in particular to a machining method for an austenitic stainless steel special-shaped multi-step hole box body.
Background
The nuclear energy is used as a clean and pollution-free novel energy source, and is one of important means for realizing carbon peak and carbon neutralization before 2030 and 2060 years in China. In view of the safety of nuclear power generation, nuclear standard of nuclear power products is extremely strict in the manufacturing process, and the austenitic stainless steel special-shaped multi-step hole box body is a core supporting component of a nuclear power product assembly and influences whether the whole reactor can normally operate, so that the manufacturing requirement is particularly strict. The product needs to be subjected to welding, heat treatment and surface treatment, and a reasonable machining allowance needs to be reserved before the operation. If reasonable process schemes and processing methods are not adopted, the manufacturing cost and the period of the product can be greatly increased.
The austenitic stainless steel special-shaped multi-step hole box body is a core supporting component in fourth-generation nuclear power products, provides support and positioning for components, and is extremely high in manufacturing precision requirement and complex in structure and machining process. The box body structure consists of an upper part and a lower part of multi-step pore plates, and a cavity is formed between the two sections of pore plates, so that the box body structure is formed by welding. The box body needs to be subjected to the process steps of welding, heat treatment, surface treatment and the like. The box body is formed by processing a round bar, the stepped hole of the box body belongs to a deep hole structure, and the bottom of the stepped hole is provided with a chamfer, so that the requirements on final position degree and coaxiality are high, and the processing difficulty is high; the lower hole plate is provided with a deep groove structure, the ratio of the groove width to the groove depth reaches 1; the product needs to be welded, subjected to heat treatment and subjected to surface treatment, particularly the surface treatment of the stepped hole needs to be carried out after the stepped hole is machined to the final size, and the difficulty in ensuring the size precision of the product during welding, heat treatment and surface treatment is high.
Disclosure of Invention
The method for machining the box body with the special-shaped multi-step holes is reasonable in machining mode, capable of improving product quality, shortening product manufacturing period and reducing product cost.
In order to achieve the above purpose, the present application provides the following technical solutions:
a method for processing an austenitic stainless steel special-shaped multi-step hole box body comprises the following steps:
processing a round bar: performing semi-finishing treatment on the round bar to obtain a pore plate;
welding the pore plate: butting the pore plates, and then welding to obtain a multi-step pore box blank;
processing a blank: and processing the multi-step hole box blank to obtain the multi-step hole box.
In the round bar processing step, the round bar is subjected to rough boring and hole milling, outer circle turning, concave surface milling, linear cutting and electric spark processing to obtain the pore plate.
The orifice plate comprises an upper orifice plate and a lower orifice plate; the upper orifice plate is provided with an upper orifice, and the lower orifice plate is provided with a lower orifice.
In the round bar processing step, the lower hole is processed to a final size, and the upper hole is roughly processed with a margin left.
The lower hole is a stepped hole with a deep hole structure, and a chamfer is arranged at the bottom of the lower hole.
The position degree and the coaxiality of the lower hole are not more than phi 0.1mm.
The lower hole plate is also provided with a deep groove structure; the deep groove structure comprises a through part and a non-through part, wherein the non-through part comprises an oblique angle area and a non-oblique angle area.
The processing mode of the penetrating part is wire cutting; the bevel angle area is processed by electric spark; the processing mode of the non-bevel angle area is boring and milling.
The upper pore plate and the lower pore plate respectively comprise a cavity, and the cavities are respectively communicated with the upper pore and the lower pore; the shape of cavity is the octagon, the straight section of cavity remains the welding shrinkage.
In the step of welding the pore plates, the upper pore plate and the lower pore plate are correspondingly butted with each other at one side provided with the cavity, then a first positioning core rod is sequentially inserted into the upper pore plate and the lower pore plate, and then the upper pore plate and the lower pore plate are welded into a whole, so that the multi-step pore box blank is obtained.
The fit clearance between the first positioning core rod and the lower hole is 0.02mm, and the fit clearance between the first positioning core rod and the upper hole is 0.05mm.
In the blank processing step, a second positioning mandrel is inserted into the multi-step hole box blank through the upper hole and the lower hole in sequence, and then the upper hole is finely processed.
And the fit clearance between the second positioning core rod and the lower hole is 0.02mm.
In the blank processing step, the multi-step hole box body blank is subjected to heat treatment and surface treatment to obtain the multi-step hole box body.
The machined dimensions of the groove widths of the upper hole, the lower hole and the deep groove structure are increased by 0.1mm relative to the final value before the surface treatment.
The shape of the multi-step hole box body is an octagonal cube.
And removing a heat affected zone generated by machining by a polishing mode.
The beneficial effect of this application is:
1. the method for processing the austenitic stainless steel special-shaped multi-step hole box body effectively shortens the manufacturing period of the box body, improves the product quality and reduces the manufacturing cost.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is an overall oblique view of a box body with a special-shaped multi-step hole;
FIG. 2 is an overall front view of a box body with a special-shaped multi-step hole;
FIG. 3 is an overall bottom view of the box body with the special-shaped multi-step holes;
FIG. 4 is an integral top view of the box body with the special-shaped multi-step holes;
FIG. 5 isbase:Sub>A sectional view of the shaped multi-step hole box taken along the line A-A shown in FIG. 4;
FIG. 6 is a sectional view of the shaped multi-step hole box taken along the line B-B shown in FIG. 4;
FIG. 7 is a cross-sectional view of the shaped multi-step bore housing taken along the line C-C shown in FIG. 4.
The main reference numbers in the drawings accompanying the present specification are as follows:
1-upper orifice plate; 2-lower orifice plate; 10-upper hole; 20-lower hole; 21-deep groove structure; 210-a through portion; 211-non-penetrating portion; 212-bevel area; 213-non-beveled regions; 3-a cavity; 4-extension end.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be mechanically coupled, directly coupled, indirectly coupled through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in this application will be understood to be a specific case for those of ordinary skill in the art.
The present application provides a method for processing an austenitic stainless steel box with a special-shaped multi-step hole, which is described in detail below. It should be noted that the following description of the embodiments is not intended to limit the preferred order of the embodiments in this application. In the following embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to related descriptions of other embodiments for parts that are not described in detail in a certain embodiment.
As shown in fig. 1 to 7, in the embodiment of the present application, a method for processing an austenitic stainless steel deformed multi-step hole box body includes the following steps:
processing a round bar: performing semi-finishing treatment on the round bar to obtain a pore plate;
welding the pore plate: butting the pore plates, and then welding to obtain a multi-step pore box blank;
processing a blank: and processing the multi-step hole box body blank to obtain the multi-step hole box body.
In the round bar processing step, the round bar is subjected to rough boring and hole milling, outer circle turning, concave surface milling, linear cutting and electric spark processing to obtain the pore plate.
The pore plate comprises an upper pore plate 1 and a lower pore plate 2; the upper orifice plate 1 is provided with an upper orifice 10, and the lower orifice plate 2 is provided with a lower orifice 20. In some embodiments of the present application, the pore sizes of the upper pores 10 and the lower pores 20 are equal.
In the round bar processing step, the lower hole 20 is processed to a final size, and the upper hole 10 is roughly processed with a margin left in the upper hole 10, so that the upper hole 10 can be conveniently and finely processed.
The lower hole 20 is a stepped hole with a deep hole structure, and a chamfer is arranged at the bottom of the lower hole 20. In some embodiments of the present application, the chamfer is 20 °; the size of the chamfer angle can also be set to be 18 degrees or 35 degrees according to actual working conditions.
The position degree and the coaxiality of the lower hole 20 are not more than phi 0.1mm, so that the size precision and the assembly precision of the lower hole are ensured.
The lower hole plate 2 is also provided with a deep groove structure 21; the deep trench structure 21 includes a through portion 210 and a non-through portion 211, and the non-through portion 211 includes a bevel angle region 212 and a non-bevel angle region 213. In some embodiments of the present application, the deep groove structure 21 may be U-shaped.
The through part 210 is processed by wire cutting; the bevel area 212 is processed by electric spark; the non-beveled region 213 is machined by boring and milling. The actual processing mode can be changed according to actual conditions.
The upper orifice plate 1 and the lower orifice plate 2 both comprise a cavity 3, and the cavity 3 is respectively communicated with the upper orifice 10 and the lower orifice 20; the shape of the cavity 3 is octagonal, and the welding shrinkage is reserved on the straight section of the cavity 3, so that the final size of the multi-step hole box body after welding meets the actual standard requirement. In some embodiments of the present application, the shape of the cavity 3 may also be circular, hexagonal or dodecagonal.
In the step of welding the orifice plate, the upper orifice plate 1 and the lower orifice plate 2 are correspondingly butted at one side provided with the cavity 3, then a first positioning mandrel (not shown) is sequentially inserted into the upper orifice plate 1 and the lower orifice plate 2, and then the upper orifice plate 1 and the lower orifice plate 2 are welded into a whole, so as to obtain the multi-step orifice box blank. The first positioning mandrel has a function of ensuring the positioning accuracy of the upper orifice plate 1 and the lower orifice plate 2 during welding.
In some embodiments of the present application, the fit clearance between the first positioning mandrel and the lower hole 20 is 0.02mm, and the fit clearance between the first positioning mandrel and the upper hole 10 is 0.05mm. The heat that produces on the way of the welding can make upper portion orifice plate 1 with lower part orifice plate 2 takes place the heat altered shape, in order to prevent to pull out after the welding finishes because of modes such as scraping damage when first location plug upper portion hole 10 with lower part hole 20 should make first location plug with upper portion hole 10 and reserve certain fit clearance between the lower part hole 20, specific fit clearance size also can be confirmed according to operating condition.
In the blank processing step, a second positioning mandrel (not shown) is first inserted into the multi-step bore case blank through the upper hole 10 and the lower hole 20 in this order, and then the upper hole 10 is finished. The second positioning mandrel has the function of improving the machining accuracy and stability when finishing the upper hole 10.
In some embodiments of the present application, the fit clearance of the second positioning mandrel with the lower hole 20 is 0.02mm; the actual value of the fit clearance can be set according to the actual working condition.
In the blank processing step, the multi-step hole box body blank is subjected to heat treatment and surface treatment to obtain the multi-step hole box body. In some embodiments of the present application, the heat treatment may be normalizing, tempering or annealing, or a combination of multiple heat treatment methods. In some embodiments of the present application, the surface treatment may be shot blasting, chemical vapor deposition, or a combination of multiple surface treatments.
In some embodiments of the present application, the machined dimensions of the groove widths of the upper hole 10, the lower hole 20 and the deep groove structure 21 are increased by 0.1mm from the final value before the surface treatment; the actual value of the reserved quantity can also be set according to the actual working condition.
The shape of the multi-step hole box body is an octagonal cube; in some embodiments of the present application, the shape of the multi-step hole box may be a cylindrical or dodecagonal cube.
And removing a heat affected zone generated by machining by polishing. In some embodiments of the present application, the heat affected zone generated by wire cutting and/or electric discharge machining may be removed by manual polishing, thereby enhancing the dimensional stability and performance stability of the multi-step hole box.
As shown in fig. 1 to 7, in some embodiments of the present application, the top view of the multi-step hole box is octagonal; the upper orifice plate 1 is provided with 13 upper orifices 10, and the lower orifice plate 2 is provided with 12 lower orifices 20; the lower orifice plate 2 is also provided with a cylindrical extension end 4, and the extension end 4 is provided with a complete through hole (not numbered); the cavity 3 is arranged between the upper hole 10 and the lower hole 20, and the cavity 3 is communicated with the upper hole 10, the lower hole 20 and the complete through hole; the lower hole plate 2 is also provided with 4U-shaped deep groove structures 21, and the deep groove structures 21 are communicated with the cavity 3.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims. In addition, the principle and the implementation manner of the present application are explained by applying specific examples in the specification, the above description of the embodiments is only for helping understanding the method and the core idea of the present application, and the content of the present application should not be construed as limiting the present application.
Claims (9)
1. The method for processing the austenitic stainless steel box body with the special-shaped multi-step hole is characterized by comprising the following steps of:
processing a round bar: performing semi-finishing treatment on the round bar to obtain a pore plate;
welding the pore plate: butting the pore plates, and then welding to obtain a multi-step pore box blank;
processing a blank: processing the multi-step hole box body blank to obtain the multi-step hole box body;
in the round bar processing step, the round bar is subjected to rough boring and hole milling, outer circle turning, concave surface milling, linear cutting and electric spark processing to obtain the pore plate;
the orifice plate comprises an upper orifice plate and a lower orifice plate; the upper hole plate is provided with an upper hole, and the lower hole plate is provided with a lower hole;
in the round bar processing step, the lower hole is processed to the final size, and the upper hole is roughly processed with a margin left;
the lower hole is a stepped hole with a deep hole structure, and a chamfer is arranged at the bottom of the lower hole;
the lower hole plate is also provided with a deep groove structure; the deep groove structure comprises a penetrating part and a non-penetrating part, wherein the non-penetrating part comprises an oblique angle area and a non-oblique angle area;
the upper orifice plate and the lower orifice plate both comprise a cavity, and the cavity is respectively communicated with the upper orifice and the lower orifice; the shape of the cavity is octagonal, and the straight section of the cavity retains the welding shrinkage;
in the step of welding the pore plates, the upper pore plate and the lower pore plate are correspondingly butted with each other at one side provided with the cavity, then a first positioning core rod is sequentially inserted into the upper pore plate and the lower pore plate, and the upper pore plate and the lower pore plate are welded into a whole to obtain the multi-step pore box blank;
in the blank processing step, a second positioning mandrel is inserted into the multi-step hole box blank through the upper hole and the lower hole in sequence, and then the upper hole is finely processed.
2. The method for processing the austenitic stainless steel special-shaped multi-step hole box body as claimed in claim 1, wherein the method comprises the following steps: the position degree and the coaxiality of the lower hole are not more than phi 0.1mm.
3. The method for machining the austenitic stainless steel special-shaped multi-step hole box body according to claim 1, wherein the method comprises the following steps: the processing mode of the penetrating part is wire cutting;
the bevel area is processed by electric sparks;
the processing mode of the non-bevel angle area is boring and milling.
4. The method for machining the austenitic stainless steel special-shaped multi-step hole box body according to claim 1, wherein the method comprises the following steps: the fit clearance between the first positioning core rod and the lower hole is 0.02mm, and the fit clearance between the first positioning core rod and the upper hole is 0.05mm.
5. The method for processing the austenitic stainless steel special-shaped multi-step hole box body as claimed in claim 1, wherein the method comprises the following steps: and the fit clearance between the second positioning core rod and the lower hole is 0.02mm.
6. The method for machining the austenitic stainless steel special-shaped multi-step hole box body according to claim 1, wherein the method comprises the following steps: in the blank processing step, the multi-step hole box body blank is subjected to heat treatment and surface treatment to obtain the multi-step hole box body.
7. The method for processing the austenitic stainless steel special-shaped multi-step hole box body as claimed in claim 6, wherein the method comprises the following steps: the machined dimensions of the groove widths of the upper hole, the lower hole and the deep groove structure are increased by 0.1mm relative to the final value before the surface treatment.
8. The method for processing the austenitic stainless steel special-shaped multi-step hole box body according to any one of claims 1 to 7, wherein the method comprises the following steps: the shape of the multi-step hole box body is an octagonal cube.
9. The method for processing the austenitic stainless steel special-shaped multi-step hole box body according to any one of claims 1 to 7, wherein the method comprises the following steps: and removing a heat affected zone generated by machining by polishing.
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| CN202111521071.2A CN114227159B (en) | 2021-12-13 | 2021-12-13 | Method for processing austenitic stainless steel special-shaped multi-step hole box body |
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| CN202111521071.2A CN114227159B (en) | 2021-12-13 | 2021-12-13 | Method for processing austenitic stainless steel special-shaped multi-step hole box body |
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| CN114227159B true CN114227159B (en) | 2022-11-15 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102091877A (en) * | 2010-12-21 | 2011-06-15 | 中国建筑第八工程局有限公司 | Construction method for butt welding irregular space box-type steel members |
| CN104209706A (en) * | 2014-08-22 | 2014-12-17 | 宝鸡石油机械有限责任公司 | Manufacture method of multi-baffle large-aperture box frame |
| CN111250930A (en) * | 2020-02-10 | 2020-06-09 | 重庆机床(集团)有限责任公司 | Hole coaxiality machining method for special-shaped box part of gear hobbing machine |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5150416B2 (en) * | 2008-09-05 | 2013-02-20 | 日立オートモティブシステムズ株式会社 | Orifice processing method and press processing method |
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- 2021-12-13 CN CN202111521071.2A patent/CN114227159B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102091877A (en) * | 2010-12-21 | 2011-06-15 | 中国建筑第八工程局有限公司 | Construction method for butt welding irregular space box-type steel members |
| CN104209706A (en) * | 2014-08-22 | 2014-12-17 | 宝鸡石油机械有限责任公司 | Manufacture method of multi-baffle large-aperture box frame |
| CN111250930A (en) * | 2020-02-10 | 2020-06-09 | 重庆机床(集团)有限责任公司 | Hole coaxiality machining method for special-shaped box part of gear hobbing machine |
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