CN110722334B - Method for broaching deformation of large axial mortise notch and eliminating tool connecting edge - Google Patents
Method for broaching deformation of large axial mortise notch and eliminating tool connecting edge Download PDFInfo
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- CN110722334B CN110722334B CN201911169583.XA CN201911169583A CN110722334B CN 110722334 B CN110722334 B CN 110722334B CN 201911169583 A CN201911169583 A CN 201911169583A CN 110722334 B CN110722334 B CN 110722334B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- 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 method for broaching deformation of a large axial mortise notch and eliminating a tool connecting edge, which is characterized in that a broaching tool is used on a numerical control broaching machine to perform rough broaching of a square groove, groove expanding, forming and fine broaching on the mortise groove layer by layer to the final size required by the design by adopting a gradual cutting broaching mode to finish the final broaching machining; roughly drawing the mortise flash structure, reserving a machining allowance of 0.2mm-0.3mm, after finishing the finish broaching machining of the mortise and the rough drawing machining of the flash, finely milling the axial tool connecting edge of the flash allowance part which appears due to tool relieving by a broach, and finely milling by adopting an end mill to finish the fine milling machining of the flash allowance of a single mortise. According to the technical scheme, the processing quality of the mortise is better, the processing period is relatively stable and controllable, and the requirements of most production units in large-scale axial mortise processing are met.
Description
Technical Field
The invention relates to the field of machining, in particular to a method for broaching deformation of a large axial mortise notch and eliminating a tool connecting edge.
Background
A certain aircraft engine fan disc part has the axial tongue-and-groove of big overlap structure, can divide the tongue-and-groove into tongue-and-groove district and overlap district according to structural feature, and the key effect of being connected with the blade cooperation is carried in the tongue-and-groove district, and size, technical conditions are very strict, generally adopt the broaching processing mode, though overlap district need not connect the cooperation, but because its radial dimension change is great, the relative relation, the dimensional variation and the roughness requirement of two planes can't be guaranteed in the broaching.
The large axial mortises are typical structures of disc parts in the fan rotor unit body of the modern aircraft engine, and the machining of the mortises is usually carried out in a broaching mode due to the severe size and technical conditions of the mortises. Along with the promotion of aeroengine performance, the part of novel structure constantly appears, and the tongue-and-groove structure that the big precision of size is high is more and more, especially for the big overlap formula structure tongue-and-groove that control engine vibrations and design, because the radial dimension span of this type of tongue-and-groove is big, often with broach height value settlement great in the design of broach, and cutter quantity is also comparatively huge. The broaching processing mode is gradually cut processing, a plurality of groups of broaches are often needed to be combined and processed on broaching of the notch flash part, due to the release of processing stress, a plurality of tool connecting edges can appear on the inner surface of the mortise flash part, the size change range of the same surface is large, the qualification of the size cannot be guaranteed, the design requirements can be met through later-stage manual pliers repair, and the part quality and the processing period cannot be guaranteed.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for broaching deformation and removing a connecting edge of a large axial mortise notch, which has the following specific technical scheme:
a method for broaching deformation and eliminating tool connecting edges of a large-scale axial mortise notch is characterized in that a large-scale axial mortise structure made of TC4 titanium alloy is divided into a mortise groove type main body and a wheel disc outer side flash structure; the length of the flash is more than 70mm, and the axial thickness is 5-22 mm;
the groove-shaped part of the mortise is used for mounting a blade, and the working surface of the mortise is tightly matched with the blade;
the outer side flash structure is single and thin;
the method comprises the following steps: performing rough broaching processing on the mortise groove type layer by layer through rough broaching of the square groove, the expanded groove and the forming by using a broach in a gradual cutting type broaching mode on a numerical control broaching machine;
step two: replacing the finish broach to perform allowance removing processing on the mortise groove type, and directly processing the mortise groove type part to the final size required by the design to finish the final broaching processing;
step three: roughly drawing the tenon groove flash structure, machining the tenon groove flash structure layer by layer through roughly drawing a square groove, expanding the groove and forming by using a broach, reserving machining allowance of 0.2-0.3 mm, and uniformly reserving allowance for flashes on two sides;
step four: after finishing the finish broaching of the mortise and the rough broaching of the flash, finish milling is carried out on the axial tool connecting edge of the flash allowance part due to the cutter relieving, an end mill is adopted for finish milling, the side edge of the end mill is used for feeding from the excircle end to the inner hole end along the diameter direction of the flash, the arc is cut out after the straight line segment is finished, then the other side is turned, the arc is cut in and the inner hole end feeds to the excircle end, and the finish milling of the flash allowance of the single mortise is finished.
The method for broaching deformation of the large axial mortise notch and eliminating the tool connecting edge has the preferred scheme that due to the fact that two different machining modes are adopted, machining equipment and stations are required to be replaced for parts, in order to guarantee machining consistency, the same positioning is required for two times of machining, angular relations are transferred through precision holes, and therefore the broaching groove is arranged after the precision holes are drilled in the technological method.
The invention has the beneficial effects that: the technical scheme of the invention is a method for solving broaching deformation of a rabbet of a mortise and eliminating a tool connecting edge, which is made for an axial mortise with a large flash structure; the method comprises the following steps of dividing a mortise into two parts, namely a mortise area and a flash area according to the special structural characteristics of the mortise, wherein the mortise area bears the key function of being in matched connection with a blade, the size, technical conditions and surface roughness requirements of the mortise are very strict, and the common milling cannot meet the design requirements and is generally carried out in a broaching machining mode; the flash part does not need to be connected and matched and consists of two parallel surfaces, the size and technical requirements are easier to achieve relative to the mortise area, but because the radial size change of the flash part is larger, the relative relation, the size change and the surface roughness requirements of two planes cannot be ensured by broaching gradual cutting type processing. Therefore, aiming at the special structure, the technical scheme of the patent is carried out by combining two processing methods, the broaching processing progress is high, the efficiency is high, but the large allowance removal amount also brings large stress deformation amount, a small amount of deformation of the mortise part can be eliminated by rough and fine broaching, and a large amount of shrinkage and distortion deformation caused by single thin structure of the flash part and poor structure rigidity can be processed by adopting a milling mode, so that good relative size and surface quality can be obtained; compared with the existing large-scale mortise by simple broaching or milling, the method has the advantages that on the basis of keeping the precision control of the broaching on the dimensional tolerance of the mortise groove, the phenomenon that the two faces which should be parallel are in a football shape due to the fact that a large allowance is removed from a flash structure of the notch is avoided, and multiple tool connecting edges exist on the surface is avoided. The method has innovative thinking, uses a simpler process method, ensures that the popularization of projects and the materialization transformation of products are relatively simpler, has small investment and quick response, effectively combines various processing modes together, makes up for deficiencies to obtain better mortise processing quality and a relatively stable and controllable processing period, and meets the requirements of most production units in the mortise processing with special structures.
Drawings
FIG. 1 is a schematic view of a tongue and groove and flash configuration;
FIG. 2 is a schematic diagram of a flash milling track;
FIG. 3 is a schematic view of a burr-receiving edge;
fig. 4 is a schematic view of a finish end mill.
In the figure, 1-mortise, 2-flash, 3-flash allowance, 4-tool connecting edge, 5-end milling cutter and 6-finish milling processing track.
Detailed Description
According to the method for broaching deformation and eliminating the tool connecting edges of the large axial mortise notch, which is shown in the figures 1-4, the large axial mortise structure made of TC4 titanium alloy is divided into a mortise 1 groove-shaped main body and a wheel disc outer side flash 2 structure; the length of the flash 2 is more than 70mm, and the axial thickness is 5-22 mm;
the groove-shaped part of the mortise 1 is used for mounting a blade, and the working surface of the mortise is tightly matched with the blade;
the outer side flash 2 is single-thin in structure;
the method comprises the following steps: performing rough broaching processing on the groove shape of the mortise 1 layer by layer through rough broaching square grooves, expanding grooves and forming by using a broach in a gradual cutting type broaching mode on a numerical control broaching machine;
step two: the finish broach is replaced to carry out allowance removing processing on the groove type of the mortise 1, and the groove type part of the mortise 1 is directly processed to the final dimension required by the design so as to finish the final broaching processing;
step three: roughly drawing the structure of the tenon groove flash 2, machining the structure layer by layer through roughly drawing a square groove, expanding the groove and forming by using a broach, reserving machining allowance 3 of 0.2-0.3 mm, and uniformly reserving allowance for the flash 3 at two sides;
step four: after finishing the finish broaching of the mortise 1 and the rough broaching of the flash 2, finish milling the margin part of the flash 2 due to an axial tool connecting edge 4 which appears due to broach relieving, finish milling by adopting an end mill 5, feeding from an outer circle end to an inner hole end along the diameter direction of the flash by using a side edge of the end mill 5, cutting an arc after the straight line segment is finished, turning to the other side, cutting in by adopting the arc and feeding from the inner hole end to the outer circle end, and finishing the finish milling of the margin of the single mortise according to a finish milling processing track 6.
Because two different processing modes are adopted, processing equipment and stations are required to be replaced for parts, in order to ensure the processing consistency, the same positioning is required for two times of processing, and the angular relation is transferred through the precision holes, therefore, the precise holes are arranged to be drilled and then the pull grooves are arranged on the process method.
Claims (2)
1. A method for broaching deformation and eliminating tool connecting edges of a large-scale axial mortise notch is characterized in that a large-scale axial mortise structure made of TC4 titanium alloy is divided into a mortise groove type main body and a wheel disc outer side flash structure; the length of the flash is more than 70mm, and the axial thickness is 5-22 mm;
the groove-shaped part of the mortise is used for mounting a blade, and the working surface of the mortise is tightly matched with the blade;
the outer side flash structure is single and thin;
the method comprises the following steps: performing rough broaching processing on the mortise groove type layer by layer through rough broaching of the square groove, the expanded groove and the forming by using a broach in a gradual cutting type broaching mode on a numerical control broaching machine;
step two: replacing the finish broach to perform allowance removing processing on the mortise groove type, and directly processing the mortise groove type part to the final size required by the design to finish the final broaching processing;
step three: roughly drawing the tenon groove flash structure, machining the tenon groove flash structure layer by layer through roughly drawing a square groove, expanding the groove and forming by using a broach, reserving machining allowance of 0.2-0.3 mm, and uniformly reserving allowance for flashes on two sides;
step four: after finishing the finish broaching of the mortise and the rough broaching of the flash, finish milling is carried out on the axial tool connecting edge of the flash allowance part due to the cutter relieving, an end mill is adopted for finish milling, the side edge of the end mill is used for feeding from the excircle end to the inner hole end along the diameter direction of the flash, the arc is cut out after the straight line segment is finished, then the other side is turned, the arc is cut in and the inner hole end feeds to the excircle end, and the finish milling of the flash allowance of the single mortise is finished.
2. The method for broaching deformation and eliminating the tool connecting edge of the large axial mortise slot according to claim 1, wherein two different machining methods are adopted, the machining equipment and the machining stations are required to be changed, the same positioning is required to be carried out in two machining processes to ensure the machining consistency, and the angular relation is transferred through the precision hole, so that the precise hole drilling and then the broaching are arranged in the technological process.
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| CN201911169583.XA CN110722334B (en) | 2019-11-26 | 2019-11-26 | Method for broaching deformation of large axial mortise notch and eliminating tool connecting edge |
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| CN110722334B true CN110722334B (en) | 2021-04-27 |
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| CN115255123A (en) * | 2022-07-18 | 2022-11-01 | 中国第一汽车股份有限公司 | Punching method, system, equipment, storage medium and vehicle for automobile door inner plate lock hole |
| CN115488360B (en) * | 2022-11-10 | 2023-03-07 | 中国航发沈阳黎明航空发动机有限责任公司 | Efficient turning method for annular mortise of high-temperature alloy disc |
Citations (6)
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| GB706730A (en) * | 1951-04-11 | 1954-04-07 | Vickers Electrical Co Ltd | Improvements relating to turbine rotors |
| CN101954513A (en) * | 2009-07-15 | 2011-01-26 | 成都成发(集团)物资有限公司 | Broaching method of large mortise of wheel disc of large-size flue gas turbine |
| CN205172641U (en) * | 2015-11-30 | 2016-04-20 | 中航商用航空发动机有限责任公司 | Tenon joins structure and aeroengine |
| CN108723481A (en) * | 2018-08-16 | 2018-11-02 | 湖南南方通用航空发动机有限公司 | A kind of turbine disc mortise processing method |
| CN109926894A (en) * | 2019-04-15 | 2019-06-25 | 南京航空航天大学 | Turbine disc mortise form grinding process equipment and its application method |
| CN110125497A (en) * | 2018-02-09 | 2019-08-16 | 中国航发商用航空发动机有限责任公司 | A kind of processing method of high temperature alloy diskware tongue-and-groove |
-
2019
- 2019-11-26 CN CN201911169583.XA patent/CN110722334B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB706730A (en) * | 1951-04-11 | 1954-04-07 | Vickers Electrical Co Ltd | Improvements relating to turbine rotors |
| CN101954513A (en) * | 2009-07-15 | 2011-01-26 | 成都成发(集团)物资有限公司 | Broaching method of large mortise of wheel disc of large-size flue gas turbine |
| CN205172641U (en) * | 2015-11-30 | 2016-04-20 | 中航商用航空发动机有限责任公司 | Tenon joins structure and aeroengine |
| CN110125497A (en) * | 2018-02-09 | 2019-08-16 | 中国航发商用航空发动机有限责任公司 | A kind of processing method of high temperature alloy diskware tongue-and-groove |
| CN108723481A (en) * | 2018-08-16 | 2018-11-02 | 湖南南方通用航空发动机有限公司 | A kind of turbine disc mortise processing method |
| CN109926894A (en) * | 2019-04-15 | 2019-06-25 | 南京航空航天大学 | Turbine disc mortise form grinding process equipment and its application method |
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