CN111604654B - Machining method of transfer rack transmission mechanism in nuclear fuel reactor - Google Patents
Machining method of transfer rack transmission mechanism in nuclear fuel reactor Download PDFInfo
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- CN111604654B CN111604654B CN202010697160.1A CN202010697160A CN111604654B CN 111604654 B CN111604654 B CN 111604654B CN 202010697160 A CN202010697160 A CN 202010697160A CN 111604654 B CN111604654 B CN 111604654B
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- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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Abstract
The invention discloses a processing method of a transfer rack transmission mechanism in a nuclear fuel stack, which comprises the following steps: performing first rough machining and first finish machining to obtain a target inner hole; performing second rough machining, first semi-finish machining, second semi-finish machining and second finish machining to obtain a target outer profile; performing third rough machining and third finish machining to obtain a target appearance structure; processing the inner shape surface of the target inner hole to form a target inner groove; processing the target outer surface to form a target rack; wherein, the processing of the target outer shape surface, the processing of the target inner hole and the processing of the target inner groove are carried out in a staggered way; the third rough machining is carried out before the second finish machining; the processing method of the transferring rack transmission mechanism in the nuclear fuel stack can timely release, measure and timely correct the deformation of the workpiece in the processing process by alternately processing the target outer shape surface, the target inner hole, the target inner groove and the target outer shape structure, and solves the problem of large processing deformation under the condition of complex structure teeth.
Description
Technical Field
The invention relates to the technical field of rack piece processing, in particular to a processing method of a nuclear fuel reactor internal transfer rack transmission mechanism.
Background
At present, no processing method or processing process for a transfer rack transmission mechanism in a nuclear fuel stack exists in the prior art. Moreover, the problem of large deformation of the slender rack after the tool is released after the slender rack is machined is solved.
Therefore, it is desirable to provide a method for machining a transfer rack transmission mechanism in a nuclear fuel stack to solve the problem of large machining deformation under complex structural tooth conditions.
Disclosure of Invention
The invention aims to solve the problems and provides a method for machining a nuclear fuel in-pile transfer rack transmission mechanism.
In order to achieve the purpose, the processing method of the transferring rack transmission mechanism in the nuclear fuel stack adopts the following technical scheme.
The invention provides a processing method of a nuclear fuel reactor internal transfer rack transmission mechanism, which is used for processing a solid forged rod into a rack member with a special outer shape surface, wherein the rack member at least comprises a target inner hole, a target shape structure and a target rack which are positioned on the outer shape surface, and a target inner groove which is positioned on the inner shape surface of the target inner hole, and the processing method comprises the following steps:
carrying out first rough machining and first finish machining on the solid forged rod to obtain a target inner hole;
performing secondary rough machining, primary semi-finish machining, secondary semi-finish machining and secondary finish machining on the solid forged rod to obtain a target outer surface;
carrying out third rough machining and third finish machining on the solid forged rod to obtain the target appearance structure;
machining the inner profile surface of the target inner hole to form the target inner groove;
machining on the target profile to form the target rack;
wherein the processing of the target outer shape surface and the processing of the target inner hole and the target inner groove are carried out in a staggered manner; the third rough machining is performed before the second finish machining.
Further, the processing method also comprises the following steps:
and (3) after the first rough machining and the second rough machining are completed, carrying out heat treatment and/or natural aging treatment on the solid forged rod.
Further, the target exterior surface, the target internal bore, and the target internal bore are obtained by:
performing the first rough machining and the second rough machining on the solid forged rod to obtain a primary inner hole and a primary outer surface;
performing the first semi-finish machining on the primary outer surface by taking the primary inner hole as a reference to obtain a secondary outer surface;
performing the first finish machining on the primary inner hole to obtain a target inner hole;
performing the second semi-finishing on the second-level outer surface by taking the target inner hole as a reference to obtain a third-level outer surface;
a step of machining an inner contour of the target inner hole to form the target inner groove; and the number of the first and second groups,
and performing second finish machining on the three-stage outer profile by taking the target inner hole and the target inner groove as references to obtain a target outer profile.
Further, the form construction is obtained by:
performing the third rough machining on the three-level outer surface by taking the target inner hole as a reference to obtain a first-level appearance structure; and the number of the first and second groups,
and carrying out third finish machining on the primary appearance structure by taking the target inner hole and the target inner groove as references to obtain a target appearance structure.
Further, the primary bore is subjected to the first finishing to obtain the target bore in the following manner:
the solid forged rod is clamped for one time by a first tool: the first tool comprises a first plane, a second plane adjacent to the first plane, a third plane deviated from the first plane and a groove formed in the first plane, wherein the third plane is in contact with a machine tool, and the inner surface of the groove is matched with the outer surface of the solid forged rod.
A step of machining the first plane and the second plane to form a reference surface for first finishing of the primary inner hole; and the number of the first and second groups,
and performing primary finish machining on the primary inner hole by taking the first plane and the second plane as references.
Further, the target inner grooves are obtained by processing the following method:
and (3) carrying out secondary clamping on the solid forged rod by using a second tool: the second tool comprises a first plane, a second plane adjacent to the first plane, a third plane deviated from the first plane and a groove formed in the first plane, wherein the third plane is in contact with a machine tool, and the inner surface of the groove is matched with the outer surface of the solid forged rod.
A step of processing the first plane and the second plane to form a reference plane for the target inner groove processing;
and finish machining the solid forged rod by taking the first plane, the second plane and the target inner hole as references to obtain the target inner groove.
Further, a target tool withdrawal groove is further formed in the outer surface of the tooth condition, and then the machining method further includes:
and before the target inner groove is machined, machining the target tool withdrawal groove used for machining the target inner groove on the secondary outer surface.
Further, the machining allowance of the primary outer surface is not less than 10 mm.
Further, the machining allowance of the three-level outer surface is not less than 5 mm.
Further, the target rack is machined in the following manner:
a step of roughing on the target outer face to form the primary rack; and the number of the first and second groups,
a step of finishing the primary rack to form the target rack.
The processing method of the transferring rack transmission mechanism in the nuclear fuel reactor has the beneficial effects that:
(1) by the staggered processing method of the target outer shape surface, the target shape structure positioned on the target outer shape surface, the target inner hole and the target inner groove, the processing method of the internal transfer rack transmission mechanism of the nuclear fuel pile can realize timely release, measurement and correction of workpiece deformation in the processing process, and further can improve the processing precision of the workpiece.
(2) By adopting the clamping tool, the machining datum can be transferred to the clamping tool, the datum planes of the target inner groove and the target inner hole can be calibrated for multiple times, and the machining precision is improved;
(3) the processing method of the transfer rack transmission mechanism in the nuclear fuel stack solves the problem of large processing deformation under the condition of complex structural teeth, and can meet the expected drawing processing requirement and processing quality.
Drawings
The technical solution and other advantages of the present invention will become apparent from the following detailed description of specific embodiments of the present invention, which is to be read in connection with the accompanying drawings.
FIG. 1A is a schematic view of a solid forged bar after primary and secondary roughing.
FIG. 1B is a schematic diagram of a solid forged rod after primary and secondary rough machining
FIG. 2A is a schematic view of the first step of semi-finishing the first outer profile.
FIG. 2B is a second schematic view of the first-stage profile after a first semi-finishing operation.
FIG. 3 is a schematic diagram of a primary bore after a first finishing operation.
FIG. 4A is a schematic view of the second semi-finishing and the third rough-machining of the second-stage outer profile.
FIG. 4B is a schematic diagram of the second semi-finishing and third rough machining of the second-stage profile.
FIG. 5 is a schematic diagram of the target inner groove after machining.
Fig. 6A is a schematic view of the target rack after processing.
Fig. 6B is a schematic diagram of the target rack after processing.
Fig. 7 is a first schematic view of the tooth condition structure of the present invention.
FIG. 8 is a second structural illustration of the tooth condition of the present invention.
Fig. 9 is a schematic structural view of the clamping tool of the present invention.
The reference numbers in the drawings are respectively:
10. tooth condition; 11. A target inner bore;
11a, a primary inner hole; 111. An inner profile;
12. a target profile; 12a, a primary profile;
12b, a secondary profile; 12c, a three-level outer profile;
121. a first outer side; 122. A second outer side;
123. a third outer side; 13. A target topography;
13a, a primary profile; 13b, secondary outer structure;
14. a target inner tank; 15. A target rack;
16. a target tool withdrawal groove; 20. Clamping a tool;
21. a first plane; 22. A second plane;
23. a third plane; 24. A groove;
241. a bottom surface; 242. A second inclined plane;
243. a second inclined plane.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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 invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, 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, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description of the present invention, it should 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; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.
Fig. 7 is a first tooth condition structure of the present invention, and fig. 8 is a second tooth condition structure of the present invention. As shown in fig. 7 and 8, the present invention provides a rack gear member, the rack gear member 10 including desired: a target internal bore 11, a target external profile 12, a target profile 13 on the target external profile 12, a target rack 15 on the target external profile 12, and a target internal groove 14 on an internal profile 111 of the target internal bore 11.
As shown in fig. 7 and 8, the rack member 10 is elongated as a whole, and the cross section of the rack member 10 has an irregular hexagonal shape. In the present embodiment, the axial length of the tooth condition 10 is 6300-.
As shown in fig. 7 and 8, a target inner hole 11 is formed at the center of the rack member 10, and a target inner groove 14 is formed on an inner surface 111 where the target inner hole 11 is formed. Specifically, the target inner grooves 14 are symmetrically distributed on the inner surface 111.
Specifically, the target inner hole 11 extends along the axial length direction of the rack member 10 and penetrates both end surfaces of the rack member 10.
The width of the target inner groove 14 is 23-27 mm. The length is 6300 and 6700 mm.
In this embodiment, the diameter of the target inner hole 11 is 185-195mm, and the axial length of the target inner hole 11 is 6300-6700 mm.
As shown in fig. 7 and 8, the target outer surface 12 includes a first outer side 121, a second outer side 122 and a third outer side 123, wherein two opposite sides of the first outer side 121 are respectively adjacent to the second outer side 122 and the third outer side 123 and form an obtuse angle. In the present embodiment, adjacent surfaces of the target exterior surface 12 except for the first exterior surface 121, the second exterior surface 122 and the third exterior surface 123 form a right angle therebetween.
In specific implementation, the included angles of the second outer side surface 122 and the third outer side surface 123 relative to the first outer side surface 121 are 135 ℃.
As shown in fig. 7 and 8, a target profile 13 is provided on the target outer surface 12, and the target profile 13 includes a plurality of groove structures 131 and a plurality of hole structures 132. In the present embodiment, the plurality of hole configurations 132 includes bolt holes on the target outer face 12.
As shown in fig. 7 and 8, a target rack 15 is formed on the target outer surface 12. In particular, the target rack 15 is located on the first outer side 121. In specific implementation, the target rack 15 is 5200-5400mm long.
Specifically, a target relief groove 16 is further provided on the target outer surface 12.
The rack assembly 10 of the present invention can be used in a nuclear fuel in-pile transfer rack gear. The tooth condition 10 has a complex overall structure and higher dimensional accuracy requirement, but is easy to deform in the machining process and has higher manufacturing difficulty.
Fig. 9 is a schematic structural view of the clamping tool of the present invention. As shown in fig. 9, the clamping tool 20 of the present invention includes a first plane 21, a second plane 22, a third plane 23, and a groove 24. Wherein the first plane 21 and the third plane 23 are deviated from each other, the second plane 22 is adjacent to the first plane 21, and the groove 24 is formed on the first plane 21. The inner surface of the recess 24 cooperates with the outer surface of the rack 10.
In a specific use, the clamping tool 20 is in contact with the machine tool through the third plane 23, the rack member 10 is placed in the groove 24, and the inner surface of the groove 24 is in contact with the target outer surface 12.
In this embodiment, the groove 24 includes a bottom surface 241 and a first inclined surface 242 and a second inclined surface 243 respectively located at two opposite sides of the bottom surface 241 and adjacent to the bottom surface 241. In particular assembly, the bottom surface 241, the first inclined surface 242 and the second inclined surface 243 are respectively matched with the outer surface of the rack 10.
The invention provides a processing method of a nuclear fuel reactor internal transfer rack transmission mechanism, which is used for processing a solid forged rod into a rack member with a special outer shape surface, wherein the rack member at least comprises a target inner hole, a target shape structure and a target rack which are positioned on the outer shape surface, and a target inner groove which is positioned on the inner shape surface of the target inner hole, and the processing method comprises the following steps:
carrying out first rough machining and first finish machining on the solid forged rod to obtain a target inner hole;
performing secondary rough machining, primary semi-finish machining, secondary semi-finish machining and secondary finish machining on the solid forged rod to obtain a target outer surface;
carrying out third rough machining and third finish machining on the solid forged rod to obtain the target appearance structure;
machining the inner profile surface of the target inner hole to form the target inner groove;
machining on the target profile to form the target rack;
wherein the processing of the target outer shape surface, the processing of the target inner hole and the processing of the target inner groove are carried out in a staggered manner; the third rough machining is performed before the second finish machining.
The processing method of the transferring rack transmission mechanism in the nuclear fuel stack can be used for processing the tooth condition, solves the problem of large processing deformation of the tooth condition with a complex structure, and can meet the expected drawing processing requirement and processing quality.
The embodiment of the invention also provides a preferable embodiment of the processing method of the transferring rack transmission mechanism in the nuclear fuel reactor. As shown in fig. 1A-6B, in the preferred embodiment, the method for manufacturing the transfer rack gear in the nuclear fuel stack includes the following steps:
s1, performing first rough machining and second rough machining on the solid forged rod to obtain a primary outer surface and a primary inner hole;
s2, performing heat treatment on the solid forged rod subjected to the first rough machining and the second rough machining;
s3, performing first semi-finish machining on the primary outer surface by taking the primary inner hole as a reference to obtain a secondary outer surface;
s4, carrying out primary clamping on the solid forged rod subjected to primary semi-finish machining by using a first clamping tool so as to carry out primary finish machining on the primary inner hole and obtain a target inner hole;
s5, performing second semi-finishing on the secondary outer surface to obtain a tertiary outer surface by taking the target inner hole as a reference, and performing third rough machining on the tertiary outer surface to obtain a primary profile structure;
s6, carrying out secondary clamping on the solid forged rod with the primary appearance structure by using a second clamping tool so as to machine and form the target inner groove;
s7, performing second finish machining and third finish machining on the three-stage outer profile and the primary profile structure respectively by taking the target inner hole and the target inner groove as reference to obtain a target outer profile and a target profile structure; and the number of the first and second groups,
and S8, machining the target outer surface to form the target rack.
The processing method of the transferring rack transmission mechanism in the nuclear fuel stack can realize multiple clamping and releasing of the workpiece by adopting the processing technologies of rough processing, semi-finish processing, finish processing and the like and processing the target outer surface 12 and the target outer shape structure 13, the target inner hole 11 and the target inner groove 14 in a staggered way, so that the deformation of machining of the workpiece can be released in time when the tool is released, and deformation detection and correction can be carried out through the subsequent processing process, thereby reducing errors caused by processing deformation and improving the processing precision of the workpiece.
The method of machining the rack member according to the present invention will be described in detail below with reference to the rack member 10 according to the embodiment of the present invention.
As shown in fig. 1A and 1B, the primary outer surface 12a and the primary inner hole 11A are obtained through the step S1. The diameter range of the primary inner hole 11a is 165-175mm, and the machining allowance of the primary outer surface 12a is not less than 10 mm.
In a specific implementation, the primary external surface 12a and the primary internal hole 11a are obtained in the following way:
s11, selecting a proper solid forged rod;
s12, performing first rough machining on the solid forged rod to obtain a primary inner hole; and the number of the first and second groups,
and S13, performing secondary rough machining on the solid forged rod with the primary inner hole to obtain the primary outer surface.
In specific implementation, the solid forged rod is selected from solid forged rods. In step S13, the machining of each of the primary outer surfaces 12a is performed alternately and multiple inversions are performed.
In step S2, the size stabilization process for the primary outer surface 12a and the primary inner hole 11a can be performed by heat-treating the solid forged bar after the first rough machining and the second rough machining are completed.
As shown in fig. 2A and 2B, after the step S3, the secondary outer surface 12B is obtained. The machining allowance of the secondary outer surface 12b is not less than 5mm, and the length machining allowance of the solid forged rod is not less than 80 mm.
As shown in fig. 3, in the step S4, the target inner hole 12 is obtained in the following manner:
s41, clamping and positioning: the solid forged rod is clamped for one time by a first tool: the first tool comprises a first plane, a second plane adjacent to the first plane, a third plane deviated from the first plane and a groove formed on the first plane, wherein the third plane is contacted with a machine tool, and the inner surface of the groove is matched with the outer surface of the solid forged rod;
s42, calibration reference step: machining the first plane 21 and the second plane 22 to form a reference plane for first finishing of the primary inner hole 11 a; and the number of the first and second groups,
s43, processing: and performing first finish machining on the primary inner hole 11a by taking the first plane 21 and the second plane 22 as references.
In the step S4, the first clamping tool is the clamping tool 20 of the present invention. Accordingly, after the step S41 is completed, that is, after the clamping tool 20 is assembled on the secondary outer surface 12b, the first outer side surface 111, the second outer side surface 112, and the third outer side surface 113 of the secondary outer surface 12b are respectively in contact with the bottom surface 241, the first inclined surface 242, and the third inclined surface 243 of the groove 24.
In step S42, the first plane 21 and the second plane 22 of the plurality of clamping tools 20 assembled on the secondary outer surface 12b are respectively located in the same plane by milling the first plane 21 and the second plane 22.
In step S43, after the first finishing process, the target inner hole 11 has a straightness of 1.5.
In the step S4, the clamping tool 20 of the present invention is used to clamp the secondary outer surface 12b, and the machining reference for performing the first finish machining on the primary inner hole 11a is transferred to the first plane 21 and the second plane 22 of the first clamping tool 20, so as to achieve the technical effect of correcting the reference in real time, thereby reducing the machining deformation and improving the machining precision of the target inner hole 11.
As shown in fig. 4A and 4B, in the step S5, the secondary external surface 12B is subjected to a second semi-finishing process with respect to the target internal hole 11 to obtain a tertiary external surface 12c, and a third rough finishing process is performed on the tertiary external surface 12c to obtain a primary profile 13 a.
Specifically, the step S5 further includes the following steps: and (3) performing at least one standing aging treatment on the solid forged rod. And carrying out at least one time of natural standing aging treatment on the solid forged rod, so that the solid forged rod releases the processing stress and the processing precision can be improved.
In specific implementation, the natural standing aging treatment can be repeatedly performed on the solid forged rod according to actual processing working hours or design requirements, so that better processing precision and processing quality can be obtained.
In the step S5, in the process of forming the three-level contour panel 12c, the tool clamped on the solid forged rod is released many times, so that the solid forged rod can be released and deformed.
With continuing reference to fig. 4A and 4B, when the outer surface 12 of the rack 10 is further provided with the target relief groove 16, the step S5 further includes the following steps:
and a step of finishing the target relief groove 16 on the tertiary outer surface 12 c.
As shown in fig. 5, in the step S6, the target inner groove 14 is formed by machining:
s61, clamping and positioning: and (3) carrying out secondary clamping on the solid forged rod by using a second tool: the second tool comprises a first plane, a second plane adjacent to the first plane, a third plane deviated from the first plane and a groove formed on the first plane, wherein the third plane is contacted with a machine tool, and the inner surface of the groove is matched with the outer surface of the solid forged rod;
s62, calibration reference step: processing the first plane and the second plane to form a reference plane for the target inner groove processing; and the number of the first and second groups,
s63, processing: and processing the target inner groove by taking the first plane, the second plane and the target inner hole as references.
In the step S6, the second clamping tool is the clamping tool 20 of the present invention. Accordingly, after the step S61 is completed, that is, after the clamping tool 20 is assembled on the three-stage outer surface 12c, the first outer side surface 121, the second outer side surface 122, and the third outer side surface 123 of the three-stage outer surface 12c are respectively in contact with the bottom surface 241, the first inclined surface 242, and the third inclined surface 243 of the groove 24.
In step S62, the first plane 21 and the second plane 22 of the plurality of clamping tools 20 mounted on the third-stage outer surface 12c are respectively located in the same plane by milling the first plane 21 and the second plane 22.
As shown in fig. 5, in step S63, two target inner grooves 14 are formed on the inner surface 111 of the target inner hole 11 by broaching based on the first plane 21, the second plane 22 and the target inner hole 11. During the machining process, the symmetry of the two target internal grooves 14 is controlled.
In this embodiment, the target inner tank 14 has a length of 23-27mm, and a length of 6300-6700 mm. After the above processing, the diameter of the target inner groove 14 is 185-195 mm.
In the step S6, the clamping tool 20 according to the present invention is used to clamp the three-stage outer profile 12c, and the machining reference of the target inner groove 14 is transferred to the first plane 21 and the second plane 22 of the second clamping tool 20, so as to correct the reference in real time, thereby reducing the machining distortion and improving the machining accuracy of the target inner groove 14.
In step S7, first, the tertiary outer surface 12c is subjected to the second finishing with reference to the target inner hole 11 and the target inner groove 14 to obtain a target outer surface 12; after finishing the machining of the target outer profile 12, a third finishing is performed on the primary profile 13a (not shown) with the target inner hole 11 and the target inner groove 14 to obtain a target profile 13.
As shown in fig. 6A to 6B, in the step S8, the target rack 15 is machined in the following manner:
roughing on said target profile 12 to obtain a primary rack 15a (not shown); and the number of the first and second groups,
the primary rack 15a is finish-machined to obtain a target rack 15.
The machining method of the transferring rack transmission mechanism in the nuclear fuel stack is characterized in that machining processes such as rough machining, semi-finish machining and finish machining are adopted, machining of the target outer surface 12, the target appearance structure 13 positioned on the target outer surface 12, the target inner hole 11 and the target inner groove 14 positioned on the target inner hole inner surface 111 is carried out in a staggered mode, machining deformation of a workpiece can be released freely when the tool is loosened, then deformation detection and correction can be carried out according to the free deformation condition of the workpiece in the subsequent machining process, and therefore errors caused by machining deformation can be reduced, and machining accuracy of the workpiece is improved; by adopting the clamping tool 20, the processing reference of the target inner groove 120 and the target inner hole 140 can be transferred to the clamping tool 20, and the processing reference can be corrected before each processing, so that the processing precision of the target inner hole 11 or the target inner groove 14 is improved; the processing method of the transfer rack transmission mechanism in the nuclear fuel stack solves the problem of large processing deformation under the condition of complex structural teeth, and can meet the expected drawing processing requirement and processing quality.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The above detailed description is provided for the processing method of the transferring rack transmission mechanism in the nuclear fuel stack according to the embodiment of the present invention, and the specific example is applied herein to explain the principle and the implementation of the present invention, and the description of the above embodiment is only used to help understanding the technical scheme and the core idea of the present invention; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. A method of forming a nuclear fuel reactor internal transfer rack gear for use in forming a solid forged bar into a rack member having a specific outer surface, said rack member further having at least a target internal bore, a target configuration and a target rack located on said outer surface, and a target internal groove located on an inner surface of said target internal bore, said method comprising:
performing first rough machining and second rough machining on the solid forged rod to obtain a primary inner hole and a primary outer surface;
after the first rough machining and the second rough machining are finished, performing heat treatment or/and natural aging treatment on the solid forged rod;
performing first semi-finish machining on the primary outer surface by taking the primary inner hole as a reference to obtain a secondary outer surface;
performing first finish machining on the primary inner hole to obtain a target inner hole;
performing second semi-finishing on the secondary outer surface by taking the target inner hole as a reference to obtain a tertiary outer surface;
a step of machining an inner contour of the target inner hole to form the target inner groove;
performing second finish machining on the three-stage outer profile by taking the target inner hole and the target inner groove as references to obtain a target outer profile;
machining on the target profile to form the target rack;
performing a third rough machining and a third finish machining on the solid forged bar to obtain the target profile structure, and the third rough machining is performed before the second finish machining;
wherein the primary bore is subjected to the first finishing to obtain the target bore by: the solid forged rod is clamped for one time by a first tool: the first tool comprises a first plane, a second plane adjacent to the first plane, a third plane deviated from the first plane and a groove formed on the first plane, wherein the third plane is contacted with a machine tool, and the inner surface of the groove is matched with the outer surface of the solid forged rod; a step of machining the first plane and the second plane to form a reference surface for first finishing of the primary inner hole; and performing the first finish machining on the primary inner hole by taking the first plane and the second plane as references;
the target inner groove is obtained by processing the following steps: and (3) carrying out secondary clamping on the solid forged rod by using a second tool: the second tool comprises a first plane, a second plane adjacent to the first plane, a third plane deviated from the first plane and a groove formed on the first plane, wherein the third plane is contacted with a machine tool, and the inner surface of the groove is matched with the outer surface of the solid forged rod; a step of processing the first plane and the second plane to form a reference plane for the target inner groove processing; and finish machining the solid forged rod by taking the first plane, the second plane and the target inner hole as references to obtain the target inner groove.
2. The method of manufacturing a nuclear fuel reactor internal transfer rack gear according to claim 1, wherein the configuration is obtained by:
performing the third rough machining on the three-level outer surface by taking the target inner hole as a reference to obtain a first-level appearance structure; and the number of the first and second groups,
and carrying out third finish machining on the primary appearance structure by taking the target inner hole and the target inner groove as references to obtain a target appearance structure.
3. The method of claim 1, wherein the tooth condition is further provided with a target relief groove on an outer surface thereof, and the method further comprises:
and before the target inner groove is machined, machining the target tool withdrawal groove used for machining the target inner groove on the secondary outer surface.
4. The method of claim 1, wherein the machining allowance of the primary profile is not less than 10 mm.
5. The method of manufacturing a nuclear fuel reactor internal transfer rack gear according to claim 1, wherein the allowance of the three-level outer surface is not less than 5 mm.
6. The method of manufacturing a transfer rack gear in a nuclear fuel stack according to claim 1, wherein the target rack is manufactured by:
a step of rough machining on the target outer surface to form a primary rack; and the number of the first and second groups,
a step of finishing the primary rack to form the target rack.
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| JP4224157B2 (en) * | 1999-01-11 | 2009-02-12 | 高周波熱錬株式会社 | Manufacturing method of hollow rack shaft |
| JP3763339B2 (en) * | 1999-02-19 | 2006-04-05 | 株式会社ジェイテクト | Rack shaft and manufacturing method thereof |
| JP4959388B2 (en) * | 2007-03-20 | 2012-06-20 | 高周波熱錬株式会社 | Hollow rack bar and method and apparatus for reducing diameter of end of hollow rack bar |
| CN101134279A (en) * | 2007-09-26 | 2008-03-05 | 常熟市安迅齿条有限公司 | Method for processing rack bar of the elevator |
| JP6408819B2 (en) * | 2014-07-28 | 2018-10-17 | 高周波熱錬株式会社 | Method for producing hollow rack bar |
| CN104384875A (en) * | 2014-10-10 | 2015-03-04 | 陕西启源科技发展有限责任公司 | Large-modulus rack machining method |
| CN105081714A (en) * | 2015-08-24 | 2015-11-25 | 重庆市璧山区四通机械厂 | Processing method of clutch racks |
| CN206067869U (en) * | 2016-09-30 | 2017-04-05 | 安徽江淮汽车集团股份有限公司 | For the mount apparatus of rack and pinion steering gear |
| CN108275198A (en) * | 2017-01-05 | 2018-07-13 | 上海格尔汽车科技发展有限公司 | Electronic power assist steering machine hollow rack and its processing method |
| CN107952999B (en) * | 2017-12-26 | 2019-06-07 | 重庆齿轮箱有限责任公司 | A kind of processing method of Hardened gear face large modulus cylindrical rack |
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