CN112809503A - Forming and grinding machining method for turbine disc mortise - Google Patents

Forming and grinding machining method for turbine disc mortise Download PDF

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Publication number
CN112809503A
CN112809503A CN202110059779.4A CN202110059779A CN112809503A CN 112809503 A CN112809503 A CN 112809503A CN 202110059779 A CN202110059779 A CN 202110059779A CN 112809503 A CN112809503 A CN 112809503A
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Prior art keywords
grinding
mortise
grinding wheel
profile
forming
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CN202110059779.4A
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CN112809503B (en
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李勋
王子铭
秦彬
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Beihang University
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Beihang University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
    • B24B19/02—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding grooves, e.g. on shafts, in casings, in tubes, homokinetic joint elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/007—Weight compensation; Temperature compensation; Vibration damping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/06—Work supports, e.g. adjustable steadies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/02—Equipment for cooling the grinding surfaces, e.g. devices for feeding coolant

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Abstract

The invention relates to a forming and grinding processing method for a turbine disc mortise, which comprises the following steps: clamping the turbine disc which is preprocessed and has the machining allowance on a grinding machine tool; determining the structure and the size of the formed grinding wheel, ensuring that a bus of the formed grinding wheel can be superposed with the profile of the mortise after the bus is translated and overlapped through a space position, and ensuring that the rotation diameter of the formed grinding wheel at the grinding contact point of the formed grinding wheel and the profile of the mortise is smaller than the horizontal width of the mortise at the point under the pre-processing state; selecting a proper motion mode of a grinding machine tool to compile a numerical control program for grinding, controlling the motion of a formed grinding wheel through the numerical control program, and superposing the profiles of the single side of the mortise at least twice; the forming grinding wheel rotates under the driving of a main shaft of a grinding machine tool, and the contour of the mortise is sequentially formed and ground according to the motion track set by a numerical control program, so that the grinding surface quality and the machining precision are ensured, and the machining efficiency and the machining flexibility are improved.

Description

Forming and grinding machining method for turbine disc mortise
Technical Field
The invention relates to the technical field of mechanical precision machining processes, in particular to a forming and grinding machining method for a turbine disc mortise.
Background
The turbine is one of important parts of the aeroengine, high-temperature and high-pressure gas is formed in a combustion chamber to push the turbine to rotate, the turbine consists of a turbine disc and turbine blades, the turbine blades are connected and installed with mortises of the turbine disc through tenons at the roots of the turbine blades, and in various structures of connection of the blades and the mortises of the wheel disc, the longitudinal tree-shaped structure is widely applied to the aeroengine due to the outstanding characteristics of full utilization of materials, capability of bearing larger tensile load, smaller axial dimension and the like.
At present, the mortise of the turbine disc of the aeroengine generally adopts machining process methods such as broaching, forming milling, forming electrolytic machining, precise wire cutting and the like, but the machining process methods at least have the following defects:
the material for manufacturing the aeroengine turbine disc belongs to typical heat-resistant difficult-to-machine materials, and the structure of the mortise is complex, and the requirement on machining precision is high. When the forming milling machining is adopted, the cutter is conical and is provided with a spiral edge, the structure is very complex, and the cutter grinding of the high-precision forming milling cutter is very difficult. Meanwhile, the material of the turbine disc is extremely difficult to process, so that the effective service life of the formed milling cutter is extremely short, and the processing precision and the precision consistency of the mortise are difficult to guarantee. When broaching is adopted, the customizing period of the broaching tool is long, the broaching tool is worn quickly and is hard to sharpen, and the broaching machine tool is very expensive, so that the flexibility of the mortise broaching process is poor, the process preparation period is long, and the rapid and low-cost development of a new product of the turbine disc is limited. The efficiency of forming and electrolytically machining the turbine disc mortise is high, and the process flexibility is good. However, the contour precision of the mortise after the forming electrolytic machining is low, the dimensional precision is extremely difficult to meet the product requirement, meanwhile, the electrolytic equipment is expensive, and the pollution of the electrolytic waste liquid generated in the technical process to the environment is large. The precision linear cutting has high processing efficiency, and the contour precision and the consistency of the processed mortise are high, but the surface of the processed mortise has an inevitable recast layer, so that the surface quality is poor, and the design requirement of a product cannot be met.
Disclosure of Invention
Technical problem to be solved
In view of the above disadvantages and shortcomings of the prior art, the present invention provides a forming and grinding method for turbine disk mortises, which solves the technical problems of low flexibility, high cost and low processing precision of turbine disk mortises processing technology.
(II) technical scheme
In order to achieve the above object, the present invention provides a method for forming and grinding a turbine disk mortise, comprising the steps of:
s1: determining the installation mode of the turbine disk and the installation position of the turbine disk on a workbench of the grinding machine tool according to the structure type of the grinding machine tool and the structure form and the size of the turbine disk, and clamping the turbine disk on the grinding machine tool;
s2: determining the structure and the size of a formed grinding wheel according to the characteristics of the mortise profile, ensuring that a generating line of the formed grinding wheel can be superposed with the mortise profile after the generating line of the formed grinding wheel is translated and overlapped through a space position, and ensuring that the revolving diameter of the formed grinding wheel at the grinding contact point of the formed grinding wheel and the mortise profile is smaller than the horizontal width of the mortise at the point under the pre-processing state;
s3: selecting a proper motion mode of a grinding machine tool to compile a numerical control program for grinding, and controlling the motion of the formed grinding wheel through the numerical control program, wherein the profile of the single side of the tenon tooth is overlapped with the profile of the single side of the groove bottom at least twice;
s4: and the forming grinding wheel rotates under the driving of a main shaft of the grinding machine tool, and sequentially carries out forming grinding on the profiles of the two sides of the tenon tooth of the mortise and the profiles of the two sides of the bottom of the mortise according to a motion track set by a numerical control program to finish the forming grinding processing of the mortise.
Optionally, the mortise of the turbine disc is pre-machined and has a machining allowance prior to the form grinding process.
Optionally, the form-grinding wheel includes a tenon-tooth-profile form-grinding wheel for performing form-grinding of the profile of the tenon tooth and a groove-bottom-profile form-grinding wheel for performing form-grinding of the profile of the groove bottom.
Optionally, the grinding machine has at least one rotary motion shaft, and the indexing motion and positioning of the mortise on the circumferential edge of the turbine disk can be realized under the driving of the rotary motion shaft.
Optionally, the centre of revolution of the turbine disc coincides with the centre of revolution of the shaft of rotational movement.
Optionally, three linear movements of the grinding machine can implement numerical control linkage.
(III) advantageous effects
The invention has the beneficial effects that: according to the forming and grinding processing method for the turbine disc mortise, two forming and grinding wheels are adopted to respectively grind the tenon tooth of the turbine disc mortise and the groove bottom of the turbine disc mortise, so that compared with the prior art, the length of a contact line between a bus of the profiling grinding wheel and the turbine disc mortise outline is reduced. The grinding wheel vibration caused by the overlong length of the contact line is avoided, and the quality of the grinding surface and the processing precision are reduced. Meanwhile, a method of sectional forming and grinding at the single side of the mortise is adopted, the rotating diameter of the forming and grinding wheel at the grinding contact point of the contour of the mortise is smaller than the horizontal width of the mortise at the point under the pre-processing state, the cooling and lubricating effects of the grinding fluid can be effectively improved, the service life of the forming and grinding wheel and the consistency of the grinding surface quality are improved, the flexibility of the process is improved, the full-contour grinding processing of the mortise of the turbine disc can be realized, and the forming and grinding wheel can still be effectively processed when the condition that the symmetrical plane of the mortise of the turbine disc is not parallel to the rotating center of the turbine disc is faced.
Drawings
FIG. 1 is a schematic view of a method of forming and grinding a turbine disk mortise according to the present invention;
FIG. 2 is a schematic front view of a turbine disk of the present invention;
FIG. 3 is an enlarged view taken at A in FIG. 2;
FIG. 4 is a schematic view of the form grinding wheel of the present invention in translation;
FIG. 5 is a schematic view showing a grinding wheel bus bar superposing manner for single-side profile grinding of a tenon tooth according to the present invention;
FIG. 6 is a schematic diagram of the movement path of the grinding wheel during the tenon tooth profile forming grinding process of the present invention;
FIG. 7 is a schematic view showing a grinding wheel bus bar superposing manner for single-side profile grinding of the groove bottom according to the present invention;
FIG. 8 is a schematic diagram of the motion trajectory of the grinding wheel during the groove bottom profile forming grinding process of the present invention.
[ description of reference ]
1: a turbine disk; 2: tenon teeth; 3: the bottom of the tank; 4: grinding the profile of the tenon tooth by using a grinding wheel; 5: forming the motion trail of the grinding wheel by the tenon tooth profile; 6: the translation track of the grinding wheel with the profile grinding on one side; 7: grinding wheel is formed on the profile of the groove bottom; 8: the profile of the groove bottom forms the motion track of the grinding wheel.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings. In which the terms "upper", "lower", etc. are used herein with reference to the orientation of fig. 3.
Fig. 1 is a schematic view of a forming and grinding method for a turbine disc mortise according to the present invention, and as shown in fig. 1, the present invention provides a forming and grinding method for a turbine disc mortise, which includes the following steps:
s1: determining the installation mode of the turbine disc 1 and the installation position of the turbine disc 1 on a workbench of the grinding machine tool according to the structure type of the grinding machine tool and the structure form and size of the turbine disc 1, and clamping the turbine disc 1 on the grinding machine tool;
s2: determining the structure and the size of the formed grinding wheel according to the characteristics of the mortise profile, ensuring that a bus of the formed grinding wheel can be superposed with the mortise profile after being translated and overlapped through a space position, and ensuring that the revolving diameter of the formed grinding wheel at the grinding contact point of the formed grinding wheel and the mortise profile is smaller than the horizontal width of the mortise at the point under a pre-processing state;
s3: selecting a proper motion mode of a grinding machine tool to compile a numerical control program for grinding, and controlling the motion of a formed grinding wheel through the numerical control program, wherein the profile of the single side of the tenon tooth 2 and the profile of the single side of the groove bottom 3 are overlapped at least twice; by superposing the profiles on the single side, the mode reduces the contact length between the bus of the forming grinding wheel and the profile of the mortise in the single superposition process, avoids the vibration of the grinding wheel caused by the overlong length of the contact line between the bus of the forming grinding wheel and the profile of the mortise, and ensures the surface quality and the precision of the mortise.
S4: and the forming grinding wheel rotates under the driving of a main shaft of the grinding machine tool, and sequentially carries out forming grinding on the profiles on the two sides of the tenon tooth 2 and the profiles on the two sides of the groove bottom 3 according to the motion track set by a numerical control program to finish the forming grinding processing of the tenon groove. In this embodiment, during the programming of the numerical control program, angular reference and position reference information related to machining are obtained from a reference block or a reference hole of the turbine disc 1, after the machining reference is determined, a machining track can be programmed according to a motion track calibrated in fig. 6 and 8 based on a mortise contour, and the indexing control and positioning of the turbine disc 1 are realized by controlling a rotary motion shaft of a rotary table of a grinding machine tool. Wherein the numerical control machining program has at least the following settings: after the tool setting is finished, the forming grinding wheel finishes the movement tracks shown in the figures 6 and 8 according to the setting of a numerical control program, and the forming grinding of a single mortise is realized; and after finishing the forming and grinding of a single mortise, according to the setting of a numerical control program, the rotating motion shaft of the rotating worktable of the grinding machine tool acts to enable the next mortise to be subjected to the forming and grinding processing to enter the processing range. And finishing the forming and grinding processing of each mortise on the turbine disc 1 repeatedly under the setting according to the numerical control program.
According to the forming and grinding processing method for the turbine disc mortise, two forming and grinding wheels are adopted to respectively grind the tenon tooth 2 and the tenon tooth 3 of the mortise of the turbine disc 1, so that compared with the prior art, the length of a contact line between a bus of the profiling grinding wheel and the turbine disc mortise outline is reduced. The grinding wheel vibration caused by the overlong length of the contact line is avoided, and the quality of the grinding surface and the processing precision are reduced. Meanwhile, a method of sectional forming and grinding at the single side of the mortise is adopted, the rotating diameter of the forming and grinding wheel at the grinding contact point of the contour of the mortise is smaller than the horizontal width of the mortise at the point under the pre-processing state, the cooling and lubricating effects of the grinding fluid can be effectively improved, the service life of the forming and grinding wheel and the consistency of the grinding surface quality are improved, the flexibility of the process is improved, the full-contour grinding processing of the mortise of the turbine disc can be realized, and the forming and grinding wheel can still be effectively processed when the symmetrical plane of the mortise of the turbine disc is not parallel to the rotating center of the turbine disc 1.
For a better understanding of the above-described technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
In this embodiment, the mortise of the turbine disk 1 has been preprocessed, and the mortise profile of the mortise of the turbine disk 1 and the groove bottom profile of the mortise both leave a certain processing allowance, wherein the mortise of the turbine disk 1 is of a longitudinal tree-shaped structure, and the processing method of the mortise preprocessing may be shaping electrolytic machining, wire cutting machining, electric spark machining, shaping milling machining, laser machining or water jet cutting machining. When the mortises of the turbine disc 1 are ground, the turbine disc 1 is subjected to indexing control through a rotary worktable of a grinding machine tool, and the main shaft of the grinding machine tool drives a forming grinding wheel to sequentially form and grind the profiles of the two sides of the tenon teeth 2 of the mortises and the profiles of the two sides of the groove bottom 3 of the mortises.
As shown in fig. 4, according to the structural characteristics of the turbine disc mortise, the grinding wheel of the longitudinal tree shape can be selected as the forming grinding wheel, after the generatrix on the grinding wheel of the longitudinal tree shape is translated and overlapped through the spatial position, the generatrix can be overlapped with the mortise profile which is also in the longitudinal tree shape, and at least two times of profile overlapping can be performed between the single-side profile part of the mortise and the forming grinding wheel, so that the contact length between the generatrix of the grinding wheel and the mortise profile can be shortened in a single grinding process by performing at least two times of profile overlapping, thereby avoiding the vibration caused by the overlong grinding contact line length of the grinding wheel and the mortise. In other embodiments, the configuration and size of the shaped grinding wheel may be selected to correspond to the characteristics of the tongue and groove profile.
As shown in fig. 5 and 7, the diameter of revolution at the grinding contact point of the form grinding wheel with the mortise contour is smaller than the horizontal width of the mortise at that point in the pre-machined state. In this embodiment, a shank wheel is used, which is a small diameter wheel having a special shape. By adopting the small-sized forming grinding wheel, the machining is more flexible, and the special structure that the symmetrical plane of the mortise of the turbine disc 1 such as an inclined mortise is not parallel to the rotation center of the turbine disc 1 can be perfectly adapted; and when the forming grinding wheel can be completely placed in the mortise, the contact length between the bus of the grinding wheel and the contour of the mortise is smaller, so that the vibration of the grinding wheel is reduced, and the processing precision is ensured.
Further, the revolving diameter of the grinding contact point of the profile grinding wheel and the mortise contour is smaller than the horizontal width of the mortise at the point in the pre-machining state. The arrangement can also ensure that the formed grinding wheel is only contacted with the contour line on one side of the tenon tooth 2 of the mortise or the contour line on the bottom 3 of the mortise and has a certain gap with the contour line on the other side in any grinding state, so that the grinding fluid can fully cool and lubricate the formed grinding wheel and a grinding area, the grinding performance of the formed grinding wheel is ensured, and the surface quality and the precision of the mortise are improved.
As shown in fig. 5 and 7, the form-grinding wheel includes a tongue tooth profile form-grinding wheel 4 for performing form-grinding of the profile of the tongue tooth 2 of the tongue groove and a groove bottom profile form-grinding wheel 7 for performing form-grinding of the profile of the groove bottom 3 of the tongue groove. The two different formed grinding wheels can reduce the contact length between the formed grinding wheel bus and the mortise profile of the turbine disc 1, avoid the grinding wheel vibration caused by overlong contact line length, and ensure the grinding surface quality and the processing precision.
In the present exemplary embodiment, the sequence of the profile-forming grinding of the tenon tooth 2 and the groove bottom 3 can be interchanged. According to different numerical control machining programs and production requirements, the sequence of the profile forming grinding machining of the tenon tooth 2 and the profile forming grinding machining of the groove bottom 3 can be arranged correspondingly, the profile forming grinding machining of the tenon tooth 2 can be performed before the profile forming grinding machining of the groove bottom 3, the profile forming grinding machining of the tenon tooth 2 can be performed after the profile forming grinding machining of the groove bottom 3, and even the profile forming grinding machining of the tenon tooth 2 and the groove bottom 3 can be performed on the same turbine disc at the same time.
In addition, the grinding machine has at least one rotary motion shaft, and the indexing motion and the positioning of the mortise in the circumferential edge of the turbine disc 1 can be realized under the driving of the rotary motion shaft. The turbine disc 1 is controlled to rotate by the machine tool, indexing movement and positioning of the mortise at the circumferential edge of the turbine disc 1 are achieved, and the rotary motion shaft can be controlled by corresponding numerical control programs to realize numerical control linkage with other moving parts of the machine tool.
Further, the center of revolution of the turbine disk 1 coincides with the center of revolution of the rotary motion shaft. The turbine disc 1 is a typical revolving body part, and when in machining, the revolving center of the turbine disc 1 is overlapped with the revolving center of a rotating motion shaft of a machine tool, so that the consistency of the datum can be ensured, the consistency of machining datum such as the position and the angular direction of the mortise machining of the turbine disc 1 in the machining process is ensured, and the condition that the mortise of the turbine disc 1 can be formed and ground is provided. The rotation center of the turbine disc 1 coincides with the rotation center of the rotary motion shaft, and the processing precision and the processing quality of the mortise of the turbine disc 1 can be guaranteed.
Further, three linear motions of the grinding machine tool can realize numerical control linkage. In order to ensure the processing precision and improve the processing efficiency, numerical control linkage can be realized among three linear motions of an X axis, a Y axis and a Z axis of the grinding machine tool, and a rotary motion shaft of the grinding machine tool can also be in numerical control linkage with the three linear motions. When each movement of the grinding machine tool can realize numerical control linkage, the movement of the grinding machine tool and the movement of the formed grinding wheel are subjected to numerical control linkage, so that the full automation of the processing process can be realized, the processing precision is ensured, the processing efficiency is improved, and the processing flow is simplified.
FIG. 6 is a movement track 5 of a tenon tooth profile forming grinding wheel of a tenon groove in the process of forming and grinding the tenon tooth profile of the tenon groove of the turbine disc 1, wherein the first, second, third, fourth, fifth and sixth in FIG. 6 are positions of the bottom center point of the tenon tooth profile forming grinding wheel 4 of the tenon groove relative to the tenon groove of the turbine disc, when the bottom center point of the tenon tooth profile forming grinding wheel 4 of the tenon groove is at the first position, the movement track is outwards ground along the normal direction of the cross section of the tenon groove of the turbine disc, then the bottom center point of the tenon tooth profile forming grinding wheel 4 of the tenon groove is horizontally moved to the second position, and the movement track is inwards ground along the normal direction of the cross section of the tenon groove of the turbine disc; when the tenon tooth profile forming grinding wheel 4 of the mortise completely moves out of the mortise, the central point of the bottom surface of the tenon tooth profile forming grinding wheel 4 of the mortise translates upwards to the position of the third position, and then the grinding processing is carried out outwards along the normal direction of the cross section of the mortise. And so on, until the contour lines of the two sides of the tenon tooth 2 of the mortise are ground. In the figure 6, the generatrix of the tenon tooth profile forming grinding wheel 4 of the mortise is superposed for 3 times to finish the grinding of the unilateral profile of the tenon tooth 2 of the mortise, when the central point of the bottom surface of the tenon tooth profile forming grinding wheel 4 of the mortise is in the first, the third, the fifth, the second, the fourth and the sixth, the generatrixes of the two adjacent grinding processes are partially superposed, thereby ensuring that the outline of the tenon tooth of the mortise can be ground.
Fig. 8 is a movement track 8 of the groove bottom profile forming grinding wheel in the process of forming and grinding the groove bottom profile of the turbine disc tongue-and-groove. And the position of the central point of the bottom surface of the formed grinding wheel relative to the tenon groove is shown in (c), (b), (c) and (c) of fig. 8. When the central point of the bottom surface of the grinding wheel 7 for forming the groove bottom profile of the mortise is at the position of the seventh, the motion trail is outwards ground along the normal direction of the cross section of the mortise, then the central point of the bottom surface of the grinding wheel 7 for forming the groove bottom profile of the mortise is horizontally translated to the position of the eighth, and then the grinding is inwards ground along the normal direction of the cross section of the mortise; when the grinding wheel 7 for forming the bottom contour of the mortise is completely moved out of the mortise, the central point of the bottom surface of the grinding wheel 7 for forming the bottom contour of the mortise is translated upwards to the position of ninthly, and then, the grinding processing is carried out outwards along the normal direction of the cross section of the mortise. And analogizing until the contour lines on the two sides of the groove bottom 3 of the mortise are ground. The generatrix of the slot bottom contour forming grinding wheel 7 of the mortise in fig. 8 is overlapped twice to finish the single-side contour grinding processing of the slot bottom 3 of the mortise, when the central point of the bottom surface of the slot bottom contour forming grinding wheel 7 of the mortise is at (c), (c) and (r), the generatrix is partially overlapped, thereby ensuring that the slot bottom contour of the mortise can be ground and processed.
In conclusion, the invention provides a forming and grinding processing method for a turbine disc mortise, which is characterized in that a turbine disc with the mortise completed by preprocessing is clamped on a grinding machine tool, the grinding machine tool is at least provided with one rotary motion shaft, and numerical control linkage can be realized among the rotary motion shaft and three linear motions of an X axis, a Y axis and a Z axis of the machine tool, so that indexing positioning and position control of the turbine disc are realized; carrying out forming grinding processing on the turbine disc mortise profile by selecting a proper forming grinding wheel, wherein the forming grinding wheel comprises a tenon tooth profile forming grinding wheel 4 and a groove bottom profile forming grinding wheel 7, the rotating diameter of the forming grinding wheel at the grinding contact point with the mortise profile is smaller than the horizontal width of the mortise at the pre-processing state, and the single-side profile part of the tenon tooth 2 and the single-side profile part of the tenon tooth 3 are superposed for at least two times; under the drive of a numerical control program, the forming grinding wheel finishes the forming grinding processing of the tenon tooth 2 in turn according to a preset track and sequence. The invention can avoid the vibration of the grinding wheel caused by the overlong length of the contact line, can effectively improve the cooling and lubricating effects of the grinding fluid, improve the service life of the formed grinding wheel and the consistency of the quality of the grinding surface, improve the flexibility of the process, can realize the full-profile grinding processing of the turbine disc mortise, and can still effectively process the turbine disc mortise when the symmetrical plane of the turbine disc mortise is not parallel to the rotation center of the turbine disc 1.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any 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 invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; either as communication within the two elements or as an interactive relationship of the two elements. 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, a first feature may be "on" or "under" a second feature, and the first and second features may be in direct contact, or the first and second features may be in indirect contact via an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lower level than the second feature.
In the description herein, the description of the terms "one embodiment," "some embodiments," "an embodiment," "an example," "a specific example" or "some examples" or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are illustrative and not restrictive, and that those skilled in the art may make changes, modifications, substitutions and alterations to the above embodiments without departing from the scope of the present invention.

Claims (6)

1. A forming and grinding machining method for a turbine disc mortise is characterized by comprising the following steps:
s1: determining the installation mode of the turbine disk and the installation position of the turbine disk on a workbench of the grinding machine tool according to the structure type of the grinding machine tool and the structure form and the size of the turbine disk, and clamping the turbine disk on the grinding machine tool;
s2: determining the structure and the size of a formed grinding wheel according to the characteristics of the mortise profile, ensuring that a generating line of the formed grinding wheel can be superposed with the mortise profile after the generating line of the formed grinding wheel is translated and overlapped through a space position, and ensuring that the revolving diameter of the formed grinding wheel at the grinding contact point of the formed grinding wheel and the mortise profile is smaller than the horizontal width of the mortise at the point under the pre-processing state;
s3: selecting a proper motion mode of a grinding machine tool to compile a numerical control program for grinding, and controlling the motion of the formed grinding wheel through the numerical control program, wherein the profile of the single side of the tenon tooth is overlapped with the profile of the single side of the groove bottom at least twice;
s4: and the forming grinding wheel rotates under the driving of a main shaft of the grinding machine tool, and sequentially carries out forming grinding on the profiles of the two sides of the tenon tooth of the mortise and the profiles of the two sides of the bottom of the mortise according to a motion track set by a numerical control program to finish the forming grinding processing of the mortise.
2. The form-grinding machining method for a turbine disk mortise according to claim 1, wherein the turbine disk mortise is pre-machined and has a machining allowance before the form-grinding machining.
3. The form-grinding machining method for a turbine disk mortise according to claim 1, wherein the form-grinding wheel includes a tenon tooth profile form-grinding wheel for form-grinding machining of a profile of the tenon tooth and a groove bottom profile form-grinding wheel for form-grinding machining of a profile of a groove bottom.
4. The method as claimed in any one of claims 1 to 3, wherein the grinding machine has at least one axis of rotational movement, and the indexing movement and positioning of the turbine disc circumferential edge mortise can be carried out by the driving of the axis of rotational movement.
5. The form-grinding machining method for a turbine disc mortise according to claim 4, wherein a center of rotation of the turbine disc coincides with a center of rotation of the rotary motion shaft.
6. The method of claim 5, wherein the three linear movements of the grinding machine are capable of numerically controlled linkage.
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