Grinding method of combined-edge fine broach for broaching fir-tree-shaped tenon grooves

Abstract

The present invention discloses a grinding method for a combined-edge fine broach for broaching a fir-tree-shaped tenon groove, comprising the following steps: using a first grinding wheel, a second grinding wheel and a third grinding wheel to process the front angle, the side profile and the back angle of the broach to be processed respectively, to form a profile cutting portion, and then using a fourth grinding wheel, a fifth grinding wheel and a sixth grinding wheel to gradually process five consecutive cutting teeth at the tail of any side of the profile cutting portion, to form a first tooth top cutting tooth, a second tooth top cutting tooth and a tooth top shaping tooth. Since the profile cutting teeth, the first tooth top cutting teeth, the second tooth top cutting teeth and the tooth top shaping teeth of the combined-edge fine broach are processed as a whole, the processing accuracy can ensure consistency, thereby avoiding the generation of "joint marks" during the broaching process, and then the profiles of both sides of the tenon groove are broached by the profile cutting teeth, and the top cutting portion broaches the top of the tenon groove, and the above-mentioned step-by-step fine processing is used to ensure the final profile size of the tenon groove.

Description

Technical Field

[0001] The invention relates to the technical field of finishing broach processing, in particular to a grinding method for a combined-blade finishing broach for broaching a fir-tree-shaped tenon groove. Background Art

[0002] The traditional set of broach designs includes rough broaches, semi-finishing broaches, finishing broaches and shape-correcting finishing broaches, among which finishing broaches are divided into two independent side finishing broaches. Specifically, it includes tooth top finishing broaches and profile finishing broaches, and the final profile of the mortise is broached and formed by the tooth top finishing broaches and profile finishing broaches. In terms of design, the top of the mortise profile and the two sides of the mortise profile are divided into two finishing broaches for broaching, and a section of the joint area is provided. However, no joint marks are allowed during the mortise broaching process to avoid cracks in the mortise due to stress concentration. However, in the actual broaching process, due to the manufacturing quality, manufacturing accuracy, processing errors and other reasons of the tooth top finishing broaches and profile finishing broaches, the appearance of joint marks cannot be avoided. Summary of the invention

[0003] The invention provides a grinding method for a combined-edge fine broach for broaching a fir-tree-shaped tenon groove, so as to solve the technical problem of how to make the processed fine broach eliminate the cutting marks during the tenon groove processing and ensure the final profile size, processing accuracy and surface quality of the tenon groove.

[0004] According to one aspect of the present invention, a grinding method for a combined-edge fine broach for broaching a fir-tree-shaped tenon groove is provided, wherein the broach comprises a tool holder and a tool body, wherein the bottom surface of the tool holder is defined as a bottom base surface, and the side surface of the tool holder is defined as a side base surface, and the tool body comprises a tool head and a plurality of cutting teeth sequentially spaced on the tool head along the length direction of the tool head, and the method comprises the following steps:

[0005] S100, preparing the broach to be processed, placing the broach on a sine magnetic table and clamping it with the bottom base surface and the side base surface as positioning references, and then machining the cutting teeth with a first grinding wheel through a machine tool grinding head, and machining the front angle of the cutting teeth to form a profile front angle;

[0006] S200, using the bottom base surface and the side base surface as positioning references, placing the broach on the sinusoidal magnetic table and clamping it, then using the machine tool dressing roller to correct the second grinding wheel according to the tooth profile requirements of the fir-tree-shaped tenon groove, and then using the second grinding wheel to process both sides of the cutting tooth so that both sides of the cutting tooth form fir-tree-shaped cutting tooth surfaces;

[0007] S300, using the bottom base surface and the side base surface as positioning references, the broach is placed on a sinusoidal magnetic table and clamped, and then the back angle of the cutting teeth is processed by the third grinding wheel through the machine tool grinding head, so that all the cutting teeth form a profile cutting portion;

[0008] S400, using the bottom base surface and the side base surface as positioning references, placing the broach on a horizontal magnetic table and clamping it, and machining the rake angles of five consecutive cutting teeth at the tail of any side of the profile cutting portion by a fourth grinding wheel to form a tooth top cutting portion;

[0009] S500, using the bottom base surface and the side base surface as positioning references, the broach is placed on the sinusoidal magnetic table and clamped, and the front angles of the fir-tree cutting tooth surfaces on both sides of the tooth top cutting part are processed by the fifth grinding wheel, and the fir-tree cutting tooth surfaces on both sides are provided with inclined surfaces, so that the groove bottom of the front angle of the tooth top cutting part and the inclined surface form a staggered angle;

[0010] S600, using the bottom base surface and the side base surface as positioning references, the broach is placed on a horizontal magnetic table and clamped, and the tooth tops of the first cutting tooth and the second cutting tooth of the tooth top cutting portion facing the profile cutting portion are ground by the sixth grinding wheel to form first tooth top cutting teeth and second tooth top cutting teeth, respectively, and the cutting teeth of the tooth top cutting portion that have not been ground are formed into tooth top correction teeth, and then the tooth tops of all cutting teeth of the profile cutting portion are ground to form profile cutting teeth, so that the tooth top heights of the profile cutting teeth, the first cutting teeth, the second cutting teeth and the correction cutting teeth are increased in sequence.

[0011] Furthermore, the step S100 includes the following steps:

[0012] S101, using the bottom base surface and the side base surface as positioning references, the broach is placed on a sinusoidal magnetic table and clamped, and the slope of the sinusoidal magnetic table is adjusted to be the same as the angle of the cutter head, and the magnetic table is magnetically conductive;

[0013] S102, adjusting the angle of the machine tool grinding head to be the same as the designed dimension angle of the front angle of the cutting teeth of the profile finishing broach;

[0014] S103, selecting a first grinding wheel having the same groove bottom arc as the cutting tooth rake angle of the profile finishing broach, and grinding the rake angles of all cutting teeth with the first grinding wheel to form a profile rake angle γ1.

[0015] Furthermore, the profile surface angle γ1 is 8° to 15°.

[0016] Furthermore, the step S200 includes the following steps:

[0017] S201, using the bottom base surface and the side base surface as positioning references, the broach is placed on a sinusoidal magnetic table and clamped, and the slope of the sinusoidal magnetic table is adjusted to be the same as the angle of the cutter head, and the magnetic table is magnetically conductive;

[0018] S202, according to the tooth shape requirement of the fir-tree type tenon groove of the turbine disk, the second grinding wheel is corrected by the machine tool, and the contours on both sides of the cutting tooth are processed by the second grinding wheel to form a fir-tree type cutting tooth surface, and the various dimensions of the fir-tree type cutting tooth surface are processed to meet the design requirement of the fir-tree type tenon groove of the turbine disk.

[0019] Furthermore, the step S300 includes the following steps:

[0020] S301, using the bottom base surface and the side base surface as positioning references, placing the broach on a sinusoidal magnetic table and clamping it, adjusting the slope of the sinusoidal magnetic table so that the center line of the tooth groove of the fir-tree profile is perpendicular to the horizontal plane, and the magnetic table is magnetically energized;

[0021] S302, using the machine tool grinding head to facilitate the third grinding wheel to grind the back angle of the cutting tooth to form a profile cutting portion, and the back angle of the profile cutting portion is the profile back angle;

[0022] S303, use the third grinding wheel to process five consecutive cutting teeth at the tail of one side of the profile cutting part to form a pre-processed tooth top cutting part, grind the profile back angle of the pre-processed tooth top cutting part, and retain the blade width of 1mm~1.2mm, and ensure that the blade is uniform, then use the third grinding wheel to grind the tail three cutting teeth of the pre-processed tooth top cutting part, and retain the blade width of 0.1mm~0.2mm to form a pre-processed tooth top correction part.

[0023] Furthermore, the profile back angle β1 is 3° to 3°30'.

[0024] Furthermore, the step S400 includes the following steps:

[0025] S401, using the bottom base surface and the side base surface as positioning references, the broach is placed on a horizontal magnetic table and clamped, and the magnetic table is magnetized;

[0026] S402, grinding the front angle of the pre-machined tooth top cutting portion with the fourth grinding wheel through the machine tool grinding head to form the front angle of the tooth top cutting portion, and the pre-machined tooth top cutting portion is ground by the fourth grinding wheel to form the tooth top cutting portion.

[0027] Furthermore, the front angle γ2 of the tooth top cutting portion is 5° to 8°, and the tooth groove depth of the front angle of the tooth top cutting portion is 2.5 mm to 3 mm.

[0028] Furthermore, the step S500 includes the following steps:

[0029] S501, using the bottom base surface and the side base surface as positioning references, the broach is placed on a sinusoidal magnetic table and clamped, and the slope of the sinusoidal magnetic table is adjusted to be the same as the angle of the cutter head, and the magnetic table is magnetically energized;

[0030] S502, machining the rake angles of the profile teeth on both sides of the tooth top cutting portion by a fifth grinding wheel to form a profile tooth rake angle γ3, wherein the profile tooth rake angle γ3 is 0°;

[0031] S503, using the fifth grinding wheel pair to form bevels on the profile teeth on both sides, so that the groove bottom of the front angle of the tooth top cutting portion and the bevel form a staggered angle A of 30' to 1°.

[0032] Furthermore, the step S600 includes the following steps:

[0033] S601, using the bottom base surface and the side base surface as positioning references, the broach is placed on a horizontal magnetic table and clamped, and the magnetic table is magnetized;

[0034] S602, grinding the tooth tops of the first cutting tooth and the second cutting tooth of the tooth top cutting portion toward the profile cutting portion respectively by the sixth grinding wheel to form the first tooth top cutting tooth and the second tooth top cutting tooth respectively, the cutting teeth of the tooth top cutting portion that have not been ground are formed into tooth top profiling teeth, and then grinding the tooth tops of all the cutting teeth of the profile cutting portion to form profile cutting teeth, so that the tooth top heights of the profile cutting teeth, the first cutting tooth, the second cutting tooth and the profiling cutting teeth are increased in sequence.

[0035] S603, grinding the back angles of the first tooth top cutting tooth and the second tooth top cutting tooth by a sixth grinding wheel to form a back angle β2 of the tooth top cutting tooth, wherein the back angle β2 of the tooth top cutting tooth is 2° to 2°30', and grinding the edge bands at the back angles of the first tooth top cutting tooth and the second tooth top cutting tooth, and removing the edge bands by grinding;

[0036] S604, grinding the back angle of the profile correction cutting tooth by a sixth grinding wheel to form a tooth top profile correction tooth back angle β3, wherein the tooth top profile correction tooth back angle β3 is 1° to 1°30'.

[0037] The present invention has the following beneficial effects:

[0038] In the grinding method of the combined blade fine broach for broaching fir-tree-shaped tenon grooves of the present invention, the rake angles of all cutting teeth are firstly processed by a first grinding wheel, so that the rake angles on both sides of the cutting teeth are processed to the design size of the rake angles of the cutting teeth of the profile fine broach; the tooth profiles on both sides of all cutting teeth are then processed by a second grinding wheel, so that the profiles on both sides of all cutting teeth form fir-tree-shaped cutting tooth surfaces that match the design size of the tenon grooves of the turbine disc; and the back angles of all cutting teeth are then processed by a third grinding wheel, so that the back angles on both sides of the cutting teeth are processed to The back angle design size of the cutting teeth of the profile finishing broach is set. At this time, all the cutting teeth set on the tool head are ground into a profile cutting part consistent with the design size of the profile finishing broach; then the front angles of five consecutive cutting teeth at the tail of any side of the profile cutting part are processed again by the fourth grinding wheel, so that the front angles on both sides of these five cutting teeth are processed to be consistent with the design size of the front angle of the cutting teeth of the tooth top finishing broach to form a tooth top cutting part; then the front angles of the fir-tree cutting tooth surfaces on both sides of the tooth top cutting part are processed by the fifth grinding wheel, and the front angles of the fir-tree cutting tooth surfaces on both sides are processed by the fifth grinding wheel, and the front angles of the fir-tree cutting tooth surfaces on both sides are processed by the fifth grinding wheel. The fir-tree-shaped cutting tooth surface is provided with an inclined surface so that the groove bottom of the front angle of the tooth top cutting part forms a staggered angle with the inclined surface. After such arrangement, the fir-tree-shaped cutting tooth surfaces on both sides of the tooth top cutting part cannot cut the tenon groove to achieve the purpose of avoiding the tenon groove of the turbine disc; finally, the tooth tops of the first cutting tooth and the second cutting tooth of the tooth top cutting part facing the profile cutting part are respectively ground by the sixth grinding wheel to form the first tooth top cutting tooth and the second tooth top cutting tooth respectively, and the cutting teeth of the tooth top cutting part that have not been ground form tooth top correction teeth, and then the profile cutting part is ground. The tooth tops of all cutting teeth in the cutting part are ground to form profile cutting teeth, so that the tooth top heights of the profile cutting teeth, the first cutting teeth, the second cutting teeth and the profiling cutting teeth increase successively. When arranged in this way, the profile cutting teeth cannot contact the top of the tenon to be processed when broaching the two sides of the tenon, and only the profiles on both sides of the tenon are fine-machined, while the first tooth top cutting teeth, the second tooth top cutting teeth and the profiling cutting teeth with gradually increasing tooth heights can gradually fine-machine the top of the tenon so that the top of the tenon meets the design dimensions. The combined blade finishing broach processed by the above-mentioned grinding method has the functions of a profile finishing broach and a tooth top finishing broach at the same time. Since the profile cutting teeth, the first tooth top cutting teeth, the second tooth top cutting teeth and the tooth top shaping teeth of the combined blade finishing broach are processed as one piece, the processing accuracy can ensure consistency, thereby avoiding the generation of "joint marks" during the broaching process. The profile cutting teeth are then used to broach the profiles on both sides of the mortise and tenon, and the first tooth top cutting teeth, the second tooth top cutting teeth and the tooth top shaping teeth are used to broach the top of the mortise and tenon. Through the above-mentioned step-by-step finishing, the final profile size, processing accuracy and surface quality of the mortise and tenon are guaranteed.

[0039] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0041] Figure 1 It is a flow chart of a grinding method of a combined blade fine broach for broaching a fir-tree type tenon groove according to a preferred embodiment of the present invention;

[0042] Figure 2 It is a structural schematic diagram of the profile cutting portion for completing steps S100 to S300 of the present invention;

[0043] Figure 3 2 is a schematic structural diagram of a combined blade fine broach for broaching a fir-tree type tenon groove according to a preferred embodiment of the present invention;

[0044] Figure 4 yes Figure 1 The structural cross-sectional view of AA in FIG.

[0045] Figure 5 yes Figure 1 The structural cross-sectional view of BB in FIG.

[0046] Figure 6 yes Figure 1 The structural cross-sectional view of CC in FIG.

[0047] Figure 7 yes Figure 1 The structural cross-sectional view of DD in;

[0048] Figure 8 yes Figure 1 The structural cross-sectional view of EE in FIG.

[0049] Fig. 9 It is a structural dimension diagram of the longitudinal tree-shaped profile profile in an embodiment of the present invention;

[0050] Fig.10 is a schematic diagram of the grinding structure of step S200 in an embodiment of the present invention;

[0051] Fig.11 It is a schematic diagram of the grinding structure of step S300 in an embodiment of the present invention.

[0052] Legend:

[0053] 100, knife body; 101, knife seat; 102, knife head; 103, V-shaped groove; 104, positioning groove;

[0054] 200, profile cutting portion; 201, profile cutting teeth;

[0055] 300, tooth top cutting portion; 301, first tooth top cutting tooth; 302, second tooth top cutting tooth; 303, tooth top shaping tooth; 304, fir-tree type cutting tooth surface. DETAILED DESCRIPTION

[0056] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0057] like Figures 1 to 8 As shown, a grinding method of a combined blade fine broach for broaching a fir-tree type tenon groove in this embodiment includes a tool holder 101 and a tool body 100, wherein the bottom surface of the tool holder 101 is defined as a bottom base surface, and the side surface of the tool holder 101 is defined as a side base surface, and the tool body 100 includes a tool head 102 and a plurality of cutting teeth sequentially spaced on the tool head 102 along the length direction of the tool head 102, and includes the following steps:

[0058] S100, preparing the broach to be processed, placing the broach on a sine magnetic table and clamping it with the bottom base surface and the side base surface as positioning references, and then machining the cutting teeth with a first grinding wheel through a machine tool grinding head, and machining the front angle of the cutting teeth;

[0059] S200, the broach is positioned on a sine magnetic table with the bottom base surface and the side base surface as the reference, the broach is clamped, the second grinding wheel is corrected according to the mortise and tenon tooth profile of the design drawing by a machine tool dressing roller, and the two side blade surfaces of the cutting tooth are processed by the second grinding wheel to form a fir-tree mortise and tenon profile on both sides of the cutting tooth;

[0060] S300, using the bottom base surface and the side base surface as positioning references, the broach is placed on a sinusoidal magnetic table and clamped, and then the cutting teeth are machined by a third grinding wheel through a machine tool grinding head, and the back angle of the cutting teeth is machined to form a profile cutting portion 200;

[0061] S400, using the bottom base surface and the side base surface as positioning references, the broach is placed on a horizontal magnetic table and clamped, and the front angles of five consecutive cutting teeth at the tail of one side of the profile cutting portion 200 are processed by a fourth grinding wheel to form a tooth top cutting portion 300;

[0062] S500, using the bottom base surface and the side base surface as positioning references, the broach is placed on a sinusoidal magnetic table and clamped, and the front angles of the profile teeth 304 on both sides of the tooth top cutting portion 300 are processed by a fifth grinding wheel, and inclined surfaces are provided on the profile teeth 304 on both sides, so that the groove bottom of the front angle of the tooth top cutting portion 300 forms a staggered angle with the inclined surface;

[0063] S600, using the bottom base surface and the side base surface as positioning references, the broach is placed on a horizontal magnetic table and clamped, and the tooth tops of the first cutting tooth and the second cutting tooth of the tooth top cutting part 300 facing the profile cutting part 200 are ground by the sixth grinding wheel to form the first tooth top cutting tooth 301 and the second tooth top cutting tooth 302 respectively, and the cutting teeth of the tooth top cutting part 300 that are not ground are formed into tooth top correction teeth 303, and then the tooth tops of all cutting teeth of the profile cutting part 200 are ground to form the profile cutting teeth 201, so that the tooth top heights of the profile cutting teeth 201, the first cutting teeth, the second cutting teeth and the correction cutting teeth are increased in sequence.

[0064] In this embodiment, the fine broaching tool to be processed includes a tool holder 101 and a tool body 100 arranged in sequence from bottom to top. The tool body 100 includes a tool head 102 arranged in a V-shape, and a plurality of cutting teeth arranged on the tool head 102 in sequence and at intervals along the direction of the tool body 100. During further processing, the bottom surface of the tool holder 101 is positioned at the bottom base surface, and the side surface of the tool holder 101 is positioned at the side base surface. At the same time, a V-shaped groove is provided on the opposite surface of the side base surface for clamping and pressing with the machine tool pressure block. The angle of the V-shaped groove is usually 10° and 15°, and is selected according to the angle of the pressure block on the CNC horizontal broaching machine. Specifically, the cutting teeth

[0065] In the specific implementation, the front angles of all cutting teeth are first processed by the first grinding wheel, so that the front angles on both sides of the cutting teeth are processed to the design size of the front angle of the cutting teeth of the profile finishing broach; then the tooth shapes on both sides of all cutting teeth are processed by the second grinding wheel, so that the profiles on both sides of all cutting teeth form fir-tree-shaped cutting tooth surfaces that match the design size of the turbine disc tenon groove; then the back angles of all cutting teeth are processed by the third grinding wheel, so that the back angles on both sides of the cutting teeth are processed to the design size of the back angle of the cutting teeth of the profile finishing broach. At this time, all the teeth set on the tool head 102 are The cutting teeth are all ground into a profile cutting portion 200 that is consistent with the design size of the profile finishing broach; then the fourth grinding wheel is used to re-process the rake angles of five consecutive cutting teeth at the tail of any side of the profile cutting portion 200, so that the rake angles on both sides of the five cutting teeth are processed to be consistent with the design size of the rake angle of the cutting teeth of the tooth top finishing broach, so as to form a tooth top cutting portion 300; then the fifth grinding wheel is used to process the rake angles of the fir-tree-shaped cutting tooth surfaces on both sides of the tooth top cutting portion 300, and the fir-tree-shaped cutting tooth surfaces on both sides are provided with bevels, so that the rake angle of the tooth top cutting portion 300 is The groove bottom and the inclined surface form a staggered angle, so that the fir-tree-shaped cutting tooth surfaces on both sides of the rear tooth top cutting part 300 cannot cut the tenon groove to achieve the purpose of avoiding the tenon groove of the turbine disc. Finally, the tooth tops of the first cutting tooth and the second cutting tooth of the tooth top cutting part 300 facing the profile cutting part 200 are ground by the sixth grinding wheel to form the first tooth top cutting tooth 301 and the second tooth top cutting tooth 302 respectively, and the cutting teeth of the tooth top cutting part 300 that are not ground form the tooth top correction teeth 303, and then the tooth tops of all the cutting teeth of the profile cutting part 200 are ground. Grinding is performed to form the profile cutting teeth 201, so that the tooth top heights of the profile cutting teeth 201, the first tooth top cutting teeth 301, the second tooth top cutting teeth 302 and the profiling cutting teeth are increased in sequence. When arranged in this way, when the profile cutting teeth 201 are broaching both sides of the mortise, they cannot contact the top of the mortise to be processed, and only the profiles on both sides of the mortise are fine-machined, while the first tooth top cutting teeth 301, the second tooth top cutting teeth 302 and the profiling cutting teeth with gradually increasing tooth heights can gradually fine-machine the top of the mortise so that the top of the mortise meets the design dimensions. The combined blade finishing broach processed by the above-mentioned grinding method has the functions of a profile finishing broach and a tooth top finishing broach at the same time. Since the profile cutting teeth 201, the first tooth top cutting teeth 301, the second tooth top cutting teeth 302 and the tooth top shaping teeth 303 of the combined blade finishing broach are processed as one piece, the processing accuracy can ensure consistency, thereby avoiding the generation of "joint marks" during the broaching process. The profile cutting teeth 201 are then used to broach the profiles on both sides of the mortise and tenon, and the first tooth top cutting teeth 301, the second tooth top cutting teeth 302 and the tooth top shaping teeth 303 are used to broach the top of the mortise and tenon. Through the above-mentioned step-by-step finishing, the final profile size, processing accuracy and surface quality of the mortise and tenon are guaranteed.

[0066] For step S100, the bottom base surface and the side base surface are used as positioning references, the broach is placed on the sinusoidal magnetic table and clamped, and then the slope of the sinusoidal magnetic table is adjusted so that the slope is the same as the angle of the cutter head 102, and then the magnetic table is magnetized, and then the angle of the machine tool grinding head is adjusted to make it the same as the design size angle of the front angle of the cutting tooth of the profile finishing broach, and then the first grinding wheel with the same tooth groove arc as the front angle of the cutting tooth of the profile finishing broach is selected, and the first grinding wheel grinds the front angle of all cutting teeth to form the profile front angle. The first grinding wheel in this step is a CBN molding grinding wheel. Specifically, the profile front angle is the angle between the blade of the cutting tooth and the vertical direction.

[0067] For step S200, the broach is placed on a sinusoidal magnetic table and clamped with the bottom base surface and the side base surface as positioning references, and then the slope of the sinusoidal magnetic table is adjusted so that the slope is the same as the angle of the cutter head 102. The magnetic table is then magnetized, and the second turbine is corrected by a machine tool according to the shape and size of the fir-tree-shaped tenon of the turbine disk, so that the second turbine forms a molding grinding wheel that matches the shape and size of the fir-tree-shaped tenon, and then the second grinding wheel is used to process the contours on both sides of the cutting tooth to form a fir-tree-shaped cutting tooth surface, and the various dimensions of the fir-tree-shaped cutting tooth surface are processed to meet the design requirements of the fir-tree-shaped tenon of the turbine disk.

[0068] Reference Figure 2 For step S300, the bottom base surface and the side base surface are used as positioning references, the broach is placed on the sinusoidal magnetic table and clamped, the slope of the sinusoidal magnetic table is adjusted so that the center line of the tooth groove of the fir-tree profile is perpendicular to the horizontal plane, the magnetic table is magnetized, and then the machine tool grinding head is used to use the third grinding wheel to grind the back angle of the cutting tooth to form a profile cutting portion 200. The back angle of the profile cutting portion 200 is the profile back angle. Specifically, the profile back angle is the angle between the cutting edge of the cutting tooth and the horizontal direction; then The third grinding wheel processes the five consecutive cutting teeth at the tail of one side of the profile cutting part 200 to form a pre-processed tooth top cutting part 300, grinds the profile back angle of the pre-processed tooth top cutting part 300, and retains a blade width of 1mm to 1.2mm, and ensures that the blade is uniform, and then grinds the three cutting teeth at the tail of the pre-processed tooth top cutting part 300 by the third grinding wheel, and retains a blade width of 0.1mm to 0.2mm to form a pre-processed tooth top correction part. Among them, the blade refers to the blade retained after the back angle is grinded, in order to ensure that the processed pre-processed tooth top cutting part 300 and the pre-processed tooth top correction part have a processing allowance during subsequent fine processing, so as to ensure that the dimensional accuracy can still be guaranteed after multiple subsequent mold repairs.

[0069] For step S400, the bottom base surface and the side base surface are used as positioning references, the broach is clamped on a horizontal magnetic table, the magnetic table is magnetized, and the rake angles of five consecutive cutting teeth at the end of one side of the profile cutting portion 200 are processed by the fourth grinding wheel to form a tooth top cutting portion 300. The rake angle design size of the tooth top cutting portion 300 is the same as the rake angle design size of the tooth top fine broach. The tooth groove arc of the fourth grinding wheel is the same as that of the tooth top fine broach cutting tooth.

[0070] For step S500, the bottom base surface and the side base surface are used as positioning references, the broach is clamped on the sinusoidal magnetic table, the slope of the sinusoidal magnetic table is adjusted to be the same as the angle of the cutter head 102, the magnetic table is magnetized, and the front angle of the fir-tree type cutting tooth surface on both sides of the tooth top cutting part 300 is processed by the fifth grinding wheel to form the front angle γ3 of the profile tooth 304, the front angle γ3 of the profile tooth 304 is 0°, and at the same time, the fir-tree type cutting tooth surface on both sides is opened with an inclined surface by the fifth grinding wheel, so that the groove bottom of the front angle of the tooth top cutting part 300 and the inclined surface form a staggered angle, so that the groove bottom of the front angle of the tooth top cutting part 300 and the inclined surface form a staggered angle A of 30' to 1°. After such a setting, the fir-tree type cutting tooth surfaces on both sides of the tooth top cutting part 300 cannot cut the tenon groove to avoid the tenon groove of the turbine disc, so that when the tooth top cutting part 300 is broaching the tenon groove, only the tooth top is cut.

[0071] For step S600, the broach is placed on a horizontal magnetic table and clamped with the bottom base surface and the side base surface as positioning references. The magnetic table is magnetized, and then the tooth tops of the first cutting tooth and the second cutting tooth of the tooth top cutting part 300 facing the profile cutting part 200 are ground respectively by the sixth grinding wheel to form the first tooth top cutting tooth 301 and the second tooth top cutting tooth 302 respectively, and the cutting teeth of the tooth top cutting part 300 that have not been ground form the tooth top correction tooth 303, and then the tooth tops of all the cutting teeth of the profile cutting part 200 are ground to form the profile cutting tooth 201, so that the tooth top heights of the profile cutting tooth 201, the first cutting tooth, the second cutting tooth and the correction cutting tooth increase in sequence. Specifically, when configured in this way, when the profile cutting teeth 201 are broaching the two sides of the mortise, they cannot contact the top of the mortise to be processed, and only the profiles on both sides of the mortise are fine-machined, while the first tooth top cutting teeth 301, the second tooth top cutting teeth 302 and the profiling cutting teeth with gradually increasing tooth heights can gradually fine-machine the top of the mortise so that the top of the mortise meets the design dimensions.

[0072] Furthermore, the step S100 includes the following steps:

[0073] S101, using the bottom base surface and the side base surface as positioning references, the broach is placed on a sinusoidal magnetic table and clamped, and the slope of the sinusoidal magnetic table is adjusted to be the same as the angle of the cutter head 102, and the magnetic table is magnetically conductive;

[0074] With respect to step S101 , when the slope of the sinusoidal magnetic table is adjusted to be the same as the angle of the cutter head 102 , the surface to be processed of the cutting tooth remains parallel to the first grinding wheel.

[0075] S102, adjusting the angle of the machine tool grinding head to be the same as the designed dimension angle of the front angle of the cutting teeth of the profile finishing broach;

[0076] For step S102, the angle of the machine tool grinding head is made the same as the design dimension angle of the front angle of the cutting tooth of the surface finishing broach so that the first grinding wheel can accurately process the front angle of the cutting tooth, so that the processed cutting tooth meets the requirements of surface finishing on both sides of the mortise and tenon.

[0077] S103, select the first grinding wheel with the same groove bottom arc as the cutting tooth rake angle of the profile finishing broach, and measure the actual tooth pitch of each cutting tooth by using the measuring head provided by the machine tool; the rake angles of all cutting teeth are ground by the first grinding wheel to form a profile rake angle γ1, and the specific profile rake angle is the clamping angle between the cutting tooth blade and the vertical direction.

[0078] Reference Figure 8 For step S103, the first grinding wheel is a CBN forming grinding wheel. The cutting surface of the first grinding wheel is the same as the bottom arc of the groove of the cutting tooth rake angle of the profile finishing broach. The actual pitch of the cutting teeth is determined according to the thickness of the part to be broached. In order to ensure that there are 2 to 3 cutting teeth involved in broaching, the spacing between the above-mentioned cutting teeth is usually 10 to 12 mm. The rake angles of all cutting teeth are ground by the first grinding wheel to form a profile rake angle γ1. In the specific implementation, the rake angles to be ground are located on both sides of the cutter head 102. After the profile rake angle on one side is machined in place, the broach is turned over and the other side is machined. After processing, it is necessary to ensure that the tooth groove and the cutting edge are smoothly transferred, and the misalignment of the profile rake angles on both sides of the cutter head 102 should be less than 0.1 mm.

[0079] Furthermore, the profile surface angle γ1 is 8° to 15°.

[0080] In this embodiment, the front angle γ1 of the profile cutting tooth 201 is 8° to 15°. The front angle is related to the rigidity of the profile cutting tooth 201. The specific size is selected according to the broaching of turbine disks of different materials. Specifically, the lower the hardness of the turbine disk material, the smaller the pulling force will be when broaching the turbine disk. The tooth mouth of the profile cutting tooth 201 is required to be sharp. A large front angle and back angle can be selected to ensure the sharpness of the tooth mouth of the profile cutting tooth 201 and the degree of avoidance during cutting. The larger the front angle of the profile cutting tooth 201, the larger the front angle γ1 of the profile cutting tooth 201. However, the front angle γ1 cannot exceed 15°. If the front angle exceeds 15°, the rigidity of the profile cutting tooth 201 will be too low, which may cause the profile cutting tooth 201 to collapse during processing or accelerate the wear rate of the profile cutting tooth 201, thereby affecting the life of the tool.

[0081] Reference Fig.10 , the step S200 comprises the following steps:

[0082] S201, using the bottom base surface and the side base surface as positioning references, the broach is placed on the sinusoidal magnetic table and clamped, and the slope of the sinusoidal magnetic table is adjusted to be the same as the angle of the cutter head 102, and the magnetic table is magnetically conductive;

[0083] S202, according to the tooth shape requirement of the fir-tree-shaped tenon groove of the turbine disk, the second turbine is corrected by a machine tool, and the contours on both sides of the cutting tooth are processed by the second turbine to form a fir-tree-shaped surface, and each dimension of the fir-tree-shaped surface is processed to meet the design requirements.

[0084] Reference Fig. 9 , for step S202, the dimensions of the fir-tree profile include the dimensions of the face wheels in each tooth groove of the fir-tree profile located on both sides of the cutting tooth. Specifically, the first face wheel group, the second face wheel group, and the third face wheel group are spaced from the tool holder 101 to the tool body 100. Each face wheel group includes two face wheels arranged on both sides of the cutter head 102. The height of the first face wheel group relative to the bottom reference is K1 and the width is M1. The height of the second face wheel group relative to the bottom reference is K2 and the width is M2. The height of the third face wheel group relative to the bottom reference is K3 and the width is M3. Through this step, the two sides of the cutting tooth form cutting surfaces consistent with the fir-tree mortise profile, so that the profiles on both sides of the mortise are processed in place. In the specific implementation, the fir-tree-shaped surfaces that need to be ground are located on both sides of the cutter head 102. After the fir-tree-shaped surface on one side is processed in place, the broach is turned over and the other side is processed. It is necessary to ensure that the contour, size, M value and K value of the fir-tree-shaped surface are consistent with those on the opposite side.

[0085] Reference Fig.11 , the step S300 comprises the following steps:

[0086] S301, using the bottom base surface and the side base surface as positioning references, placing the broach on a sinusoidal magnetic table and clamping it, adjusting the slope of the sinusoidal magnetic table so that the center line of the tooth groove of the fir-tree profile is perpendicular to the horizontal plane, and the magnetic table is magnetically energized;

[0087] For step S301, the slope of the sinusoidal magnetic table is adjusted so that the center line of the tooth groove of the fir-tree profile is perpendicular to the horizontal plane. The purpose of this setting is to allow the teeth of the third grinding wheel to vertically extend into the tooth groove of the fir-tree profile, making it easier for the third grinding wheel to process the back angle of the cutting tooth.

[0088] S302, grinding the back angle of the cutting tooth by the third grinding wheel through the machine tool grinding head to form a profile cutting portion 200, wherein the back angle of the profile cutting portion 200 is the profile back angle;

[0089] For step S302, the back angles of all cutting teeth are processed by the third grinding wheel, so that the back angles on both sides of the cutting teeth are processed to the design size of the back angle of the cutting teeth of the profile finishing broach. At this time, all the cutting teeth set on the tool head 102 are ground into the profile cutting part 200 consistent with the design size of the profile finishing broach. Specifically, the back angle of the cutting tooth is the angle between the cutting edge of the cutting tooth and the horizontal direction.

[0090] S303, using a third grinding wheel to process five consecutive cutting teeth at the tail of one side of the profile cutting portion 200 to form a pre-processed tooth top cutting portion 300, grinding the profile back angle of the pre-processed tooth top cutting portion 300, and retaining a blade width of 1mm to 1.2mm, and ensuring that the blade is uniform, and then grinding the tail three cutting teeth of the pre-processed tooth top cutting portion 300 by a third grinding wheel, and retaining a blade width of 0.1mm to 0.2mm, to form a pre-processed tooth top correction portion.

[0091] For step S303, the three grinding wheels are used to process the five consecutive cutting teeth at the tail of one side of the profile cutting part 200 to form a pre-processed tooth top cutting part 300, the profile back angle of the pre-processed tooth top cutting part 300 is ground, and the blade width of 1mm to 1.2mm is retained, and the blade width is ensured to be uniform, and then the three cutting teeth at the tail of the pre-processed tooth top cutting part 300 are ground by the third grinding wheel, and the blade width of 0.1mm to 0.2mm is retained to form a pre-processed tooth top correction part. Among them, the blade refers to the blade retained after the back angle is ground, in order to ensure that the pre-processed tooth top cutting part 300 and the pre-processed tooth top correction part have a processing allowance during the subsequent fine processing, so as to ensure that the dimensional accuracy can still be guaranteed after multiple mold repairs.

[0092] Reference Figure 8 , the profile back angle β1 is 3°~3°30'.

[0093] In this embodiment, the profile back angle is the angle between the cutting edge of the cutting tooth and the horizontal direction. The back angle β1 of the profile cutting tooth 201 is 3° to 3°30'. When the back angle is less than 3°, the mortise and tenon groove increases after broaching, which reduces the broaching allowance of the subsequent tooth top cutting portion 300, thereby being disadvantageous for the subsequent fine machining of the tooth top cutting portion 300. If the back angle is greater than 3°30', it is difficult to machine the profiles on both sides of the mortise and tenon groove in place, and the design requirements cannot be met.

[0094] Furthermore, the step S400 includes the following steps:

[0095] S401, using the bottom base surface and the side base surface as positioning references, the broach is placed on a horizontal magnetic table and clamped, and the magnetic table is magnetized;

[0096] S402, grinding the front angle of the pre-machined tooth top cutting portion 300 with the fourth grinding wheel through the machine tool grinding head to form the front angle of the tooth top cutting portion 300, and the pre-machined tooth top cutting portion 300 is ground by the fourth grinding wheel to form the tooth top cutting portion 300.

[0097] For step S402, the front angles of five consecutive cutting teeth at the tail of any side of the profile cutting part 200 are processed again by using the fourth grinding wheel, so that the front angles on both sides of the five cutting teeth are processed to be consistent with the design size of the front angle of the cutting teeth of the tooth top fine broach, so as to form the tooth top cutting part 300. The cutting surface of the fourth grinding wheel is the same as the tooth groove arc of the front angle of the cutting teeth of the tooth top fine broach. Specifically, the angle between the cutting edge of the cutting teeth of the tooth top cutting part of the front angle of the tooth top cutting part 300 and the vertical direction.

[0098] Reference Figure 6 The front angle γ2 of the tooth top cutting portion 300 is 5° to 8°, and the tooth groove depth of the front angle of the tooth top cutting portion 300 is 2.5mm to 3mm.

[0099] In this embodiment, the angle between the cutting edge of the cutting tooth of the tooth top cutting part 300 and the vertical direction is, specifically, the lower the hardness of the turbine disk material, the smaller the pulling force will be when broaching the turbine disk. The tooth mouth of the tooth top cutting part 300 is required to be sharp, and a large front angle and back angle can be selected to ensure the sharpness of the tooth mouth of the tooth top cutting part 300 and the degree of avoidance during cutting. The larger the front angle of the tooth top cutting part 300, but the front angle γ2 cannot exceed 8°. If the front angle exceeds 8°, the rigidity of the tooth top cutting part 300 will be too low, which may easily cause the tooth top cutting part 300 to collapse during processing or accelerate the wear rate of the tooth top cutting part 300, thereby affecting the life of the tool. On the contrary, the higher the hardness of the turbine disk material, the greater the pulling force will be when broaching the turbine disk. The tooth top cutting part 300 needs to have sufficient strength, and the smaller the rake angle selected by the broaching tool, but the rake angle γ2 cannot be less than 5°. If the rake angle is less than 5°, the iron chips after broaching the turbine disk will be squeezed with the tooth top cutting part 300, thereby wearing the tooth top cutting part 300, causing tooth mouth defects, and affecting the broaching quality of the tool. When the depth of the tooth groove is less than 2.5mm, the broaching depth is insufficient, making it difficult to process the top of the tenon groove in place; when the depth of the tooth groove is greater than 3mm, the rigidity of the teeth in the tooth top broaching area will be reduced, making the fine broaching tool easy to collapse during use.

[0100] Furthermore, the step S500 includes the following steps:

[0101] S501, using the bottom base surface and the side base surface as positioning references, the broach is placed on the sinusoidal magnetic table and clamped, and the slope of the sinusoidal magnetic table is adjusted to be the same as the angle of the cutter head 102, and the magnetic table is magnetically conductive;

[0102] S502, machining the rake angles of the profile teeth 304 on both sides of the tooth top cutting portion 300 by a fifth grinding wheel to form a rake angle γ3 of the profile teeth 304, wherein the rake angle γ3 of the profile teeth 304 is 0°;

[0103] S503, using the fifth grinding wheel pair to provide bevels on the profile teeth 304 on both sides, so that the groove bottom of the front angle of the tooth top cutting part 300 and the bevel form a staggered angle A of 30' to 1°.

[0104] Reference Figure 7 , for step 502 and step 503, the front angle of the fir-tree type cutting tooth surface on both sides of the tooth top cutting part 300 is processed by the fifth grinding wheel, and the fir-tree type cutting tooth surface on both sides is provided with an inclined surface, so that the groove bottom of the front angle of the tooth top cutting part 300 and the inclined surface form a staggered angle, so that the fir-tree type cutting tooth surface on both sides of the rear tooth top cutting part 300 cannot broach the tenon groove, so as to achieve the purpose of avoiding the tenon groove of the turbine disc. Specifically, the front angle of the profile tooth is the angle between the profile tooth blade and the vertical direction, and the front angle γ3 of the profile tooth 304 is 0°, in order to avoid the fir-tree type cutting tooth surface on both sides from contacting and colliding with the profile surfaces on both sides of the processed tenon groove. If the front angle γ3 of the profile tooth 304 has an angle, then when the tenon groove is ground, the profile tooth 304 will collide with the tenon groove and cause concave damage. The purpose of setting the staggered angle is to avoid the front angle of the tooth top cutting part 300 from coinciding with the front angle of the profile teeth 304 on both sides, so that when the tooth top cutting part 300 is grinding the tenon, the fir-tree-shaped cutting teeth on both sides of the tooth top cutting part 300 can better avoid the tenon, thereby achieving the purpose of not participating in the drawing of the profiles on both sides of the tenon.

[0105] Reference Figure 6 , the step S600 comprises the following steps:

[0106] S601, using the bottom base surface and the side base surface as positioning references, the broach is placed on a horizontal magnetic table and clamped, and the magnetic table is magnetized;

[0107] S602, grinding the tooth tops of the first cutting tooth and the second cutting tooth of the tooth top cutting part 300 toward the profile cutting part 200 by the sixth grinding wheel to form the first tooth top cutting tooth 301 and the second tooth top cutting tooth 302 respectively, the cutting teeth of the tooth top cutting part 300 that have not been ground form the tooth top correction tooth 303, and then grinding the tooth tops of all the cutting teeth of the profile cutting part 200 to form the profile cutting tooth 201, so that the tooth top heights of the profile cutting tooth 201, the first cutting tooth, the second cutting tooth and the correction cutting tooth increase in sequence.

[0108] With respect to step S602, when the profile cutting teeth 201 are set up in this way, when broaching the two sides of the tenon groove, they cannot contact the top of the tenon groove to be processed, and only the profiles on both sides of the tenon groove are finely processed, while the first tooth top cutting teeth 301, the second tooth top cutting teeth 302 and the shape correction cutting teeth with gradually increasing tooth heights can gradually finely process the top of the tenon groove so that the top of the tenon groove meets the design dimensions. Furthermore, the first tooth top cutting teeth 301, the second tooth top cutting teeth 302 and the tooth top shape correction teeth 303 are designed to have gradually increasing heights, and the broaching work of the top of the tenon groove is divided into multiple stages, thereby reducing the wear of the first tooth top cutting teeth 301, the second tooth top cutting teeth 302 and the tooth top shape correction teeth 303, so as to increase the service life of the first tooth top cutting teeth 301, the second tooth top cutting teeth 302 and the tooth top shape correction teeth 303.

[0109] S603, grinding the back angles of the first tooth top cutting tooth 301 and the second tooth top cutting tooth 302 by a sixth grinding wheel to form a back angle β2 of the tooth top cutting tooth, wherein the back angle β2 of the tooth top cutting tooth is 2° to 2°30′, and grinding the edge bands at the back angles of the first tooth top cutting tooth 301 and the second tooth top cutting tooth 302, and removing the edge bands by grinding;

[0110] For step S603, the back angle β2 of the first tooth top cutting tooth 301 and the second tooth top cutting tooth 302 is the angle between the cutting tooth blade and the horizontal direction. The back teeth of the first tooth top cutting tooth 301 and the second tooth top cutting tooth 302 are ground by the sixth grinding wheel to make the back angle β2 of the tooth top cutting tooth be processed to 2°~2°30'. At the same time, the original back angle of the tooth top cutting tooth is reduced to the original retained 1mm~1.2mm blade band to make the back angle β2 of the tooth top cutting tooth be processed to the designed size.

[0111] S604, grinding the back angle of the profile correction cutting tooth by a sixth grinding wheel to form a tooth top profile correction tooth back angle β3, the tooth top profile correction tooth 303 back angle β3 is 1° to 1°30'.

[0112] For step S604, specifically, the back angle of the tooth top profiling tooth is the angle between the blade of the tooth top profiling tooth and the horizontal direction. In order to ensure the improvement of the drawing precision, the back angle of the tooth top profiling tooth 303 is smaller than the back angle β2 of the tooth top cutting part 300. When set in this way, the sharpness of the tooth mouth of the tooth top profiling part is increased, which is more conducive to the drawing of the top of the mortise and tenon, so as to improve the accuracy of the mortise and tenon, and make the size of the mortise and tenon easier to be processed to the designed size.

[0113] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for grinding a combined-blade fine broach for broaching a fir-tree-shaped tenon groove, the broach comprising a tool holder (101) and a tool body (100), wherein the bottom surface of the tool holder (101) is defined as a bottom base surface, and the side surface of the tool holder (101) is defined as a side base surface, and the tool body (100) comprises a tool head (102) and a plurality of cutting teeth sequentially spaced on the tool head (102) along the length direction of the tool head (102), characterized in that: The following steps are involved: S100, preparing a broach to be processed, placing the broach on a sinusoidal magnetic table and clamping it with the bottom base surface and the side base surface as positioning references, and then machining the cutting teeth with a first grinding wheel through a machine tool grinding head, and machining the front angle of the cutting teeth to form a profile front angle; S200, using the bottom base surface and the side base surface as positioning references, placing the broach on the sinusoidal magnetic table and clamping it, then using the machine tool dressing roller to correct the second grinding wheel according to the tooth profile requirements of the fir-tree-shaped tenon groove, and then using the second grinding wheel to process both sides of the cutting tooth so that both sides of the cutting tooth form fir-tree-shaped cutting tooth surfaces; S300, using the bottom base surface and the side base surface as positioning references, placing the broach on a sinusoidal magnetic table and clamping it, and then machining the back angle of the cutting teeth by a third grinding wheel through a machine tool grinding head, so that all the cutting teeth form a profile cutting portion (200); S400, using the bottom base surface and the side base surface as positioning references, placing the broach on a horizontal magnetic table and clamping it, and machining the rake angles of five consecutive cutting teeth at the tail of any side of the profile cutting portion (200) by a fourth grinding wheel to form a tooth top cutting portion (300); S500, using the bottom base surface and the side base surface as positioning references, placing the broach on a sinusoidal magnetic table and clamping it, machining the front angles of the fir-tree type cutting tooth surfaces on both sides of the tooth top cutting portion (300) by a fifth grinding wheel, and providing inclined surfaces on the fir-tree type cutting tooth surfaces on both sides so that the groove bottom of the front angle of the tooth top cutting portion (300) forms a staggered angle with the inclined surface; S600, with the bottom base surface and the side base surface as positioning references, the broach is placed on a horizontal magnetic table and clamped, and the tooth tops of the first cutting tooth and the second cutting tooth of the tooth top cutting portion (300) facing the profile cutting portion (200) are ground respectively by the sixth grinding wheel to form a first tooth top cutting tooth (301) and a second tooth top cutting tooth (302), respectively, and the cutting teeth of the tooth top cutting portion (300) that have not been ground are formed into tooth top correction teeth (303), and then the tooth tops of all cutting teeth of the profile cutting portion (200) are ground to form profile cutting teeth (201), so that the tooth top heights of the profile cutting teeth (201), the first tooth top cutting teeth (301), the second tooth top cutting teeth (302) and the tooth top correction teeth (303) are increased in sequence.

2. The grinding method of the combined blade fine broach for broaching fir-tree mortise according to claim 1, characterized in that: The step S100 includes the following steps: S101, using the bottom base surface and the side base surface as positioning references, the broach is placed on a sinusoidal magnetic table and clamped, and the slope of the sinusoidal magnetic table is adjusted so that the angle is the same as that of the cutter head (102), and the magnetic table is magnetically conductive; S102, adjusting the angle of the machine tool grinding head to be the same as the designed dimension angle of the front angle of the cutting teeth of the profile finishing broach; S103, selecting a first grinding wheel having the same groove bottom arc as the cutting tooth rake angle of the profile finishing broach, and using the first grinding wheel to grind the rake angles of all cutting teeth to form a profile rake angle γ1.

3. The grinding method of the combined blade fine broach for broaching fir-tree mortise according to claim 2, characterized in that: The profile surface angle γ1 is 8° to 15°.

4. The grinding method of the combined blade finishing broach for broaching fir-tree type tenon groove according to claim 1, characterized in that: The step S200 includes the following steps: S201, using the bottom base surface and the side base surface as positioning references, the broach is placed on a sinusoidal magnetic table and clamped, and the slope of the sinusoidal magnetic table is adjusted so that the angle is the same as that of the cutter head (102), and the magnetic table is magnetically conductive; S202, according to the tooth shape requirement of the fir-tree type tenon groove of the turbine disk, the second grinding wheel is corrected by the machine tool, and the contours on both sides of the cutting tooth are processed by the second grinding wheel to form a fir-tree type cutting tooth surface, and the various dimensions of the fir-tree type cutting tooth surface are processed to meet the design requirement of the fir-tree type tenon groove of the turbine disk.

5. The grinding method of the combined blade finishing broach for broaching fir-tree type tenon groove according to claim 1, characterized in that: The step S300 includes the following steps: S301, using the bottom base surface and the side base surface as positioning references, placing the broach on a sinusoidal magnetic table and clamping it, adjusting the slope of the sinusoidal magnetic table so that the center line of the tooth groove of the fir-tree profile is perpendicular to the horizontal plane, and the magnetic table is magnetically energized; S302, using a machine tool grinding head to facilitate a third grinding wheel to grind the back angle of the cutting tooth to form a profile cutting portion (200), wherein the back angle of the profile cutting portion (200) is a profile back angle; S303, using a third grinding wheel to process five consecutive cutting teeth at the tail of one side of the profile cutting portion (200) to form a pre-processed tooth top cutting portion (300), grinding the profile back angle of the pre-processed tooth top cutting portion (300), retaining a blade width of 1mm to 1.2mm, and ensuring that the blade is uniform, and then using a third grinding wheel to grind the tail three cutting teeth of the pre-processed tooth top cutting portion (300), retaining a blade width of 0.1mm to 0.2mm, to form a pre-processed tooth top correction portion.

6. The grinding method of a combined-edge fine broach for broaching a fir-tree-shaped tenon groove according to claim 5, characterized in that: The profile back angle β1 is 3° to 3°30'.

7. The grinding method of a combined-edge fine broach for broaching a fir-tree-shaped tenon groove according to claim 6, characterized in that: The step S400 includes the following steps: S401, using the bottom base surface and the side base surface as positioning references, the broach is placed on a horizontal magnetic table and clamped, and the magnetic table is magnetized; S402, grinding the front angle of the pre-machined tooth top cutting portion (300) with the fourth grinding wheel through the machine tool grinding head to form the front angle of the tooth top cutting portion (300), and the pre-machined tooth top cutting portion (300) is ground by the fourth grinding wheel to form the tooth top cutting portion (300).

8. The grinding method of a combined-edge fine broach for broaching a fir-tree-shaped tenon groove according to claim 7, characterized in that: The front angle γ2 of the tooth top cutting portion (300) is 5° to 8°, and the tooth groove depth of the front angle of the tooth top cutting portion (300) is 2.5 mm to 3 mm.

9. The grinding method of a combined blade fine broach for broaching a fir-tree type tenon groove according to claim 1, characterized in that: The step S500 includes the following steps: S501, using the bottom base surface and the side base surface as positioning references, the broach is placed on a sinusoidal magnetic table and clamped, and the slope of the sinusoidal magnetic table is adjusted so that the angle is the same as that of the cutter head (102), and the magnetic table is magnetically conductive; S502, machining the front angles of the fir-tree type cutting tooth surfaces on both sides of the tooth top cutting portion (300) by a fifth grinding wheel to form a front angle γ3 of the profile tooth (304), wherein the front angle γ3 of the profile tooth (304) is 0°; S503, using the fifth grinding wheel pair to provide bevels on the fir-tree cutting tooth surfaces on both sides, so that the groove bottom of the front angle of the tooth top cutting part (300) and the bevel form a staggered angle, so that the groove bottom of the front angle of the tooth top cutting part (300) and the bevel form a staggered angle A of 30' to 1°.

10. The grinding method of a combined-edge fine broach for broaching a fir-tree-shaped tenon groove according to claim 1, characterized in that: The step S600 includes the following steps: S601, the broach is positioned with the bottom base surface and the side base surface as the reference, the broach is placed on a horizontal magnetic table and clamped, and the magnetic table is magnetized; S602, grinding the tooth tops of the first cutting tooth and the second cutting tooth of the tooth top cutting portion (300) toward the profile cutting portion (200) by a sixth grinding wheel, respectively, to form a first tooth top cutting tooth (301) and a second tooth top cutting tooth (302), the cutting teeth of the tooth top cutting portion (300) that have not been ground form tooth top correction teeth (303), and then grinding the tooth tops of all the cutting teeth of the profile cutting portion (200) to form profile cutting teeth (201), so that the tooth top heights of the profile cutting teeth (201), the first tooth top cutting teeth (301), the second tooth top cutting teeth (302) and the tooth top correction teeth (303) are increased in sequence; S603, grinding the back angles of the first tooth top cutting tooth (301) and the second tooth top cutting tooth (302) by a sixth grinding wheel to form a tooth top cutting tooth back angle β2, wherein the tooth top cutting tooth back angle β2 is 2° to 2°30', and grinding the edge bands at the back angles of the first tooth top cutting tooth (301) and the second tooth top cutting tooth (302), and removing the edge bands by grinding; S604, grinding the back angle of the profile correction cutting tooth by a sixth grinding wheel to form a back angle β3 of the tooth top profile correction tooth (303), wherein the back angle β3 of the tooth top profile correction tooth (303) is 1° to 1°30'.

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