CN111702249B - Broach group structure for grooving wheel disc tenon and mortise and grooving method - Google Patents
Broach group structure for grooving wheel disc tenon and mortise and grooving method Download PDFInfo
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- CN111702249B CN111702249B CN202010615151.3A CN202010615151A CN111702249B CN 111702249 B CN111702249 B CN 111702249B CN 202010615151 A CN202010615151 A CN 202010615151A CN 111702249 B CN111702249 B CN 111702249B
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- 238000000034 method Methods 0.000 title claims description 18
- 238000003825 pressing Methods 0.000 claims description 2
- 238000005520 cutting process Methods 0.000 abstract description 15
- 230000002159 abnormal effect Effects 0.000 abstract description 4
- 238000005299 abrasion Methods 0.000 abstract description 4
- 101100134058 Caenorhabditis elegans nth-1 gene Proteins 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000003754 machining Methods 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D43/00—Broaching tools
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D37/00—Broaching machines or broaching devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D41/00—Broaching machines or broaching devices characterised only by constructional features of particular parts
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Abstract
The invention discloses a broach group structure for grooving wheel disc tenons and grooves, which comprises n depth grooving broaches and 1 width groove-expanding broach, wherein the tooth side width dimension b from the head tooth to the tail tooth of each depth grooving broach is designed with an inverted cone amount, and the tooth side width dimension b of the head tooth of the nth depth grooving broach is smaller than the tooth side width dimension b of the tail tooth of the nth-1 depth grooving broach; the height dimension d of the width groove expanding broach is smaller than the height dimension h of the last tooth of the nth depth grooving broach, the width dimension a of the first tooth side of the width groove expanding broach is smaller than the width dimension b of the last tooth side of the nth depth grooving broach, and the width dimension a of the last tooth side of the width groove expanding broach is larger than the width dimension b of the first tooth side of the 1 st depth grooving broach. The broach broaching machine can avoid the problem of friction between the tooth side of the broach cutting tooth and the machined surface, further effectively avoid abnormal abrasion of the broach, prevent the broach from breaking and damaging, and prolong the service life of the broach.
Description
Technical Field
The invention belongs to the technical field of broach design for broaching a disc ring part mortise, and particularly relates to a broach group structure for grooving a wheel disc mortise and a grooving method.
Background
At present, when a large mortise on a wheel disc is grooved by a broaching process, a group of broaches is used for removing the grooving allowance through adjusting the relative positions of a broach group and the wheel disc in the radius direction, namely the radius value of the wheel disc, and multi-station broaching is carried out. However, the width of each broach cutting tooth part in the current broach group is the same, but the height direction is different with the increase of the tooth lifting amount, and the design of the broach group has the disadvantage that the friction between the tooth side of the broach cutting tooth and the processed surface is caused, and specifically, the following conditions are included: firstly, because the width sizes of the cutting tooth parts of each broach in the broach group are the same, the tooth side of the cutting tooth of the latter broach is easy to rub against the machined surface; secondly, after the broaching tool set broaches all the mortises on the whole wheel disc for the first time, the radius value of the wheel disc is adjusted, and when broaching is carried out again, the side face of the cutting tooth of the broaching tool inevitably generates friction with the machined surface due to the existence of indexing errors. The friction under the above conditions aggravates the wear of the broach, shortens the service life of the broach, and may cause the broke damage of the broach due to the broach manufacturing error and the broaching indexing error. In addition, the prior art requires that all broach tooth sides have the same size, which inevitably causes high requirement on design precision of the broach and great manufacturing difficulty.
Disclosure of Invention
Aiming at the technical defects in the prior art, the invention provides a broach group structure for grooving wheel disc tenons and grooves and a grooving method, which can avoid the problem of friction between the tooth side of a broach cutting tooth and a machined surface, further effectively avoid abnormal abrasion of the broach, prevent the broach from breaking teeth and damaging, and prolong the service life of the broach.
In order to solve the technical problems, the invention is realized by the following technical scheme:
a broaching tool group structure for grooving wheel disc tenons and grooves comprises n depth grooving broaching tools and 1 width groove expanding broaching tool, wherein the value of n is 1, 2, 3, …, n; the height dimension of the first tooth of the depth slotting broach is connected with the height dimension of the last tooth of the depth slotting broach 1 in the No. 2, the height dimension of the first tooth of the depth slotting broach is connected with the height dimension of the last tooth of the depth slotting broach 2 in the No. 3, …, the height dimension of the first tooth of the depth slotting broach is connected with the height dimension of the last tooth of the depth slotting broach n-1 in the No. n, and the width dimension of the first tooth of the width expanding slotting broach is connected with the width dimension of the last tooth of the depth slotting broach n;
back taper is designed for the tooth side width dimension b from the first tooth to the last tooth of each depth grooving broach, and the tooth side width dimension b of the first tooth of the nth depth grooving broach is less than or equal to the tooth side width dimension b of the last tooth of the (n-1) th depth grooving broach; the height dimension h from the first tooth to the last tooth of each deep slotting broach is designed with tooth lifting amount;
the height dimension d of the width groove expanding broach is smaller than the height dimension h of the last tooth of the nth depth groove expanding broach; the tooth side width dimension a from the head tooth to the tail tooth of the width groove expanding broach is designed with tooth lift, the tooth side width dimension a of the head tooth of the width groove expanding broach is smaller than the tooth side width dimension b of the tail tooth of the nth depth grooving broach, and the tooth side width dimension a of the tail tooth of the width groove expanding broach is larger than the tooth side width dimension b of the head tooth of the 1 st depth grooving broach.
Furthermore, the back taper amount of the tooth side of each deep slotting broach is 0.03-0.1 mm.
Furthermore, the tooth lifting amount of each deep slotting broach is 0.03-0.08 mm.
Furthermore, the single-side tooth lifting amount of the width groove expanding broach is 0.02-0.06 mm.
Furthermore, the width dimension a of the tail tooth side of the width groove expanding broach is 0.3-1 mm larger than the width dimension b of the head tooth side of the 1 st depth groove expanding broach.
Furthermore, chamfers c are designed on the upper edge and the lower edge of the tooth sides of the cutter teeth on the two sides of the width groove expanding broach and are used as back angles.
Further, the chamfer dimension c is greater than half the difference between the width dimension a of the end tooth side of the width expanding slot broach and the width dimension b of the end tooth side of the nth depth slotting broach.
Further, the height dimension h of the first tooth of the nth depth slotting broach is connected with the height dimension h of the last tooth of the (n-1) th depth slotting broach, and the difference is as follows: plus or minus one tooth lift.
Furthermore, the side surfaces of the cutter bodies of the deep grooving broach and the width groove expanding broach are respectively provided with a V-shaped groove for compaction.
A wheel disc tenon groove slotting method is characterized in that the broach group is installed in a broach box of a broaching machine, a broaching machine clamp is installed on an indexing disc of the broaching machine, and a wheel disc is installed on the broaching machine clamp; adjusting parameters of a broaching machine, and sequentially broaching all the mortises on the wheel disc; adjusting the radius value of the wheel disc, wherein each adjusting value e is smaller than the difference value between the height h of the last tooth of the nth depth slotting broach and the height h of the first tooth of the 1 st depth slotting broach, and broaching all the mortises on the wheel disc again; and repeating broaching for a plurality of times according to the design requirement of the broach group until the mortise is machined to the design requirement.
Compared with the prior art, the invention has at least the following beneficial effects: the invention provides a broaching tool group structure for grooving wheel disc tenons and ditches, and the width dimension b of the tooth side from the first tooth to the last tooth of each deep grooving broaching tool is designed with an inverted cone amount, and the width dimension b of the tooth side of the first tooth of the nth deep grooving broaching tool is less than or equal to the width dimension b of the tooth side of the last tooth of the nth-1 deep grooving broaching tool, so that the problem that the broaching tool and the previously processed surface have friction is solved; meanwhile, the width dimension a of the first tooth side of the width groove expanding broach is smaller than the width dimension b of the last tooth side of the nth depth groove expanding broach, and the width dimension a of the last tooth side of the width groove expanding broach is larger than the width dimension b of the first tooth side of the 1 st depth groove expanding broach, so that the problem that the machined surfaces of the first station or stations generate friction when the broaching group is subjected to broaching again is solved. That is, the broach group designed by the invention solves various friction problems between the broach group and the machined surface, thereby effectively avoiding abnormal abrasion of the broach, preventing the broach from breaking teeth and damaging and prolonging the service life of the broach. Through the adjustment by the radius value of processing rim plate, 1 group broach can carry out many times (station) repeated broaching and deep-drawing tongue-and-groove, reduces appurtenance time such as tool changing, dress sword, improves machining efficiency. Meanwhile, the slotting method reduces the using number of the broaching tools and the using cost of the broaching tools. The tooth side width dimension of the deep slotting broach in the broach group designed by the invention is gradually reduced, the design precision of the broach is reduced by the unequal width design structure, the manufacturing difficulty of the broach is reduced, and the slotting method completely meets the requirements of the wheel disc mortise broaching process.
Furthermore, the back taper of the tooth side of each deep slotting broach is measured to be 0.03-0.1 mm, and the value is not suitable to be too large; the number of the broaches and the value of the number of the broaches are related to the broaching allowance of the width groove expanding broaches, and on the premise of meeting the use requirement, the smaller value can shorten the length of the width groove expanding broaches and reduce the manufacturing cost.
Furthermore, the tooth lifting amount of each deep slotting broach is 0.03-0.08 mm, the value of the tooth lifting amount is small, the broach can be guaranteed to have good cutting performance and be in a normal wear range when broaching is repeated for many times, and the service life of the broach is guaranteed.
Furthermore, the single-side tooth lifting amount of the width groove expanding broach is 0.02-0.06 mm, both sides of the width groove expanding broach are simultaneously broached, and the value is smaller, and the service life of the broach is also ensured to ensure that the width dimension of the broached mortise meets the design and use requirements.
Further, the width dimension a of the last tooth side of the width groove expanding broach is 0.3-1 mm larger than the width dimension b of the first tooth side of the 1 st depth groove expanding broach, and because the indexing disc has indexing errors during repeated broaching of the mortises, the design of the value ensures that certain gaps exist between the tooth sides of the depth groove expanding broach and the widths of the processed mortises during subsequent repeated broaching, avoids interference and friction with the processed surfaces, and prolongs the service life of the broach.
Furthermore, chamfers c are designed at the upper edge and the lower edge of the tooth sides of the cutter teeth at the two sides of the width groove expanding broach and are used as back angles, the design ensures that the top surface of the width groove expanding broach does not participate in cutting, the cutting performance of the broach is optimized, and the manufacturing difficulty of the broach is reduced.
Furthermore, the chamfer angle c is larger than half of the difference value between the width dimension a of the tail tooth side of the width groove expanding broach and the width dimension b of the tail tooth side of the nth depth groove expanding broach, the tooth tip participates in cutting, the chamfer angle can eliminate the hidden danger of tooth tip tooth breakage, and the broach is prevented from being damaged in advance.
Further, the height dimension h of the first tooth of the nth depth slotting broach is connected with the height dimension h of the last tooth of the (n-1) th depth slotting broach, and the difference is as follows: plus or minus one tooth lifting amount, and the maximum allowance is not more than one tooth lifting amount when the front broach and the rear broach are connected.
A wheel disc tenon groove slotting method adopts the broach group, the broach group is arranged in a broaching machine tool box, a broaching machine fixture is arranged on a broaching machine dividing disc, and a wheel disc is arranged on the broaching machine fixture; adjusting parameters of a broaching machine, and sequentially broaching all the mortises on the wheel disc; adjusting the radius value of the wheel disc, wherein each adjusting value e is smaller than the difference value between the height h of the last tooth of the nth depth slotting broach and the height h of the first tooth of the 1 st depth slotting broach, and broaching all the mortises on the wheel disc again; the broaching is repeated for a plurality of times according to the design requirement of the broach group until the mortise is machined to the design requirement, the slotting method solves various friction problems between the broach and the machined surface, and the service life of the broach is prolonged; through the adjustment by the radius value of processing rim plate, 1 group broach can carry out many times (station) repeated broaching and deep-drawing tongue-and-groove, reduces appurtenance time such as tool changing, dress sword, improves machining efficiency. Meanwhile, the slotting method reduces the using number of the broaching tools and the using cost of the broaching tools. The tooth side width dimension of the deep slotting broach in the broach group designed by the invention is gradually reduced, the design precision of the broach is reduced by the unequal width design structure, the manufacturing difficulty of the broach is reduced, and the slotting method completely meets the requirements of the wheel disc mortise broaching process.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic drawing of the broaching stock of group 1 deep slot broaching tool of the present invention;
FIG. 2 is a schematic drawing of broaching margins of a group of depth grooving broaches and width expanding grooving broaches according to the present invention 1;
FIG. 3 is a schematic view of the present invention 1 set of grooving broaches with 2 (station) broaches;
FIG. 4 is a schematic view of the structure of a 1-point deep groove broach according to the present invention;
fig. 5 is a schematic structural view of a 1-bar slot expanding broach according to the present invention.
In the figure: 1-8 represents a deep grooving broach; and 9, a width expanding slot broach.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, 2, 3, 4 and 5, the broach group structure for wheel disc mortise slotting of the present invention includes n depth slotting broaches and 1 width slot expanding broach, where n is 1, 2, 3, …, n. Specifically, the height of the first tooth of the 2 nd deep slotting broach is connected with the height of the last tooth of the 1 st deep slotting broach, the height of the first tooth of the 3 rd deep slotting broach is connected with the height of the last tooth of the 2 nd deep slotting broach, …, the height of the first tooth of the nth deep slotting broach is connected with the height of the last tooth of the n-th-1 th deep slotting broach, and the width of the first tooth of the wide slotting broach is connected with the width of the last tooth of the nth deep slotting broach.
As shown in fig. 4, each tooth side width dimension b from the leading tooth to the last tooth of the depth grooving broach is designed with an inverted taper amount, and the tooth side width dimension b of the leading tooth of the nth depth grooving broach is less than or equal to the tooth side width dimension b of the last tooth of the n-1 th depth grooving broach; the invention effectively solves the problem of friction between the side surface of the cutting tooth (namely the broach) and the previously processed surface through the design. Preferably, the back taper amount of the tooth side of each deep slotting broach is 0.03-0.1 mm. Tooth lifting amount is designed for the height dimension h from the first tooth to the last tooth of each deep slotting broach, preferably, the tooth lifting amount of each deep slotting broach is 0.03-0.08 mm, the height dimension h of the first tooth of the nth deep slotting broach is connected with the height dimension h of the last tooth of the nth-1 deep slotting broach, and the difference is (+/-one tooth lifting amount).
As shown in fig. 4 and 5, the height dimension d of the width-expanding slot broach is smaller than the height dimension h of the last tooth of the nth depth-slotting broach; the tooth side width dimension a from the head tooth to the tail tooth of the width groove expanding broach is designed with tooth lift, the tooth side width dimension a of the head tooth of the width groove expanding broach is smaller than the tooth side width dimension b of the tail tooth of the nth depth grooving broach, and the tooth side width dimension a of the tail tooth of the width groove expanding broach is larger than the tooth side width dimension b of the head tooth of the 1 st depth grooving broach. Through the design, the problem that the broaching tool group broaching tool generates friction with the machined surface of the previous 1 station or a plurality of stations when broaching the wheel disc mortise again is effectively solved, and the problem that the broaching tool cutting tooth side surface generates friction with the machined surface due to indexing errors, machining errors and the like is completely avoided. Preferably, the width dimension a of the tail tooth side of the width groove expanding broach is 0.3-1 mm larger than the width dimension b of the head tooth side of the 1 st depth groove expanding broach; the single-side tooth lifting amount of the width groove expanding broach is 0.02-0.06 mm.
And the upper edge and the lower edge of the tooth sides of the cutter teeth on the two sides of the width groove expanding broach are provided with chamfers c and back angles, and the size of the chamfers c is more than half of the difference value between the width size a of the tooth side of the tail tooth of the width groove expanding broach and the width size b of the tooth side of the tail tooth of the nth depth groove slotting broach.
As shown in fig. 4 and 5, the side surfaces of the cutter bodies of the deep grooving broach and the width grooving broach are respectively provided with a pressing V-shaped groove.
The invention relates to a wheel disc tenon and mortise grooving method, which is characterized in that by applying the broach group disclosed by the invention, the broach group is arranged in a broach box of a broaching machine, a broaching machine fixture is arranged on an indexing disc of the broaching machine, and a wheel disc is arranged on the broaching machine fixture; adjusting parameters of a broaching machine, and sequentially broaching all the mortises on the wheel disc; adjusting the radius value of the wheel disc, wherein each adjusting value e is smaller than the difference value between the height h of the last tooth of the nth depth slotting broach and the height h of the first tooth of the 1 st depth slotting broach, and broaching all the mortises on the wheel disc again; and repeating broaching for a plurality of times according to the design requirement of the broach group until the mortise is machined to the design requirement.
In order to explain the technical solution of the present invention more clearly, a specific embodiment is described below.
As shown in fig. 1 and fig. 2, the design of the wheel disc grooving broach group in the present embodiment mainly includes 8 depth grooving broaches 1 to 8 and 1 width grooving broach 9. Wherein, the 1 st ~ 8 total head tooth and the end tooth side width size design of 8 degree of depth fluting broaches in the broach group have 0.05mm back taper volume, and the friction problem that broach self and preceding machined surface exist has been solved to this design. The height dimension of the width groove expanding broach is matched with the height dimension of the depth groove expanding broach in the broach group, the width dimension is increased by 0.6mm compared with the width dimension of 18.7mm of the tooth side of the 1 st depth groove expanding broach 1 in the broach group, and is taken as 19.3mm, and the design solves the problem that the broach group generates friction with the machined surface for 1 time or several times when broaching again. In this embodiment, the tooth lift of the deep grooving broach is 0.04mm, and the tooth lift of the groove expanding broach is 0.03 mm.
As shown in fig. 2, the width groove expanding broach 9 is designed with a tooth lift along the tooth width direction, the first tooth width dimension is 18.22mm, which is smaller than the last tooth width dimension of the 8 th depth groove expanding broach, which is 18.3 mm; meanwhile, the upper edge and the lower edge of the tooth sides at two sides are designed with chamfers and are used as back angles, the size of the chamfers is 0.7mm multiplied by 45 degrees, and the chamfers are larger than the single margin (19.3-18.3)/2 in the width direction of the groove and are 0.5 mm.
As shown in fig. 2 and 3, after the broaching of all the mortises on the whole wheel disc by the broaching tool group, the radius value is adjusted to be 12.2mm, which is smaller than the difference value of 12.4mm between the height dimension of the last tooth of the 8 th deep slotting broaching tool and the height dimension of the first tooth of the 1 st deep slotting broaching tool; when broaching again, the tooth side width dimension 18.7mm of the 1 st depth slotting broach 1 is smaller than the tooth side width dimension 19.3mm of the width expanding slotting broach 9, so that the problem that the cutting tooth side surface of the broach generates friction with the machined surface due to indexing errors, machining errors and the like is completely avoided.
According to the broach group designed by the invention, the tooth side width dimension of the deep slotting broach is gradually reduced, the design precision of the broach is reduced due to the design structure with different widths, the manufacturing difficulty of the broach is reduced, and the problem of friction between the tooth side of the broach cutting tooth and the machined surface is avoided, so that abnormal abrasion of the broach is effectively avoided, the broach is prevented from breaking the tooth and being damaged, and the service life of the broach is prolonged. The design of the width groove expanding broach ensures that a certain gap exists between the tooth side of the depth groove expanding broach and the width of the processed mortise, avoids the interference and friction with the processed surface when the broaching is repeated, and prolongs the service life of the broach. The slotting method completely meets the requirements of the broaching process of the wheel disc mortise.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A broaching tool group structure for grooving wheel disc tenons and grooves is characterized by comprising n depth grooving broaching tools and 1 width groove expanding broaching tool, wherein the value of n is 1, 2, 3, …, n; the height dimension of the first tooth of the depth slotting broach is connected with the height dimension of the last tooth of the depth slotting broach 1, the height dimension of the first tooth of the depth slotting broach is connected with the height dimension of the last tooth of the depth slotting broach 2, the height dimension of the first tooth of the depth slotting broach is connected with the height dimension of the last tooth of the depth slotting broach n-1, and the width dimension of the first tooth of the width slot expanding broach is connected with the width dimension of the last tooth of the depth slotting broach n;
back taper is designed for the tooth side width dimension b from the first tooth to the last tooth of each depth grooving broach, and the tooth side width dimension b of the first tooth of the nth depth grooving broach is less than or equal to the tooth side width dimension b of the last tooth of the (n-1) th depth grooving broach; the height dimension h from the first tooth to the last tooth of each deep slotting broach is designed with tooth lifting amount;
the height dimension d of the width groove expanding broach is smaller than the height dimension h of the last tooth of the nth depth groove expanding broach; the tooth side width dimension a from the head tooth to the tail tooth of the width groove expanding broach is designed with tooth lift, the tooth side width dimension a of the head tooth of the width groove expanding broach is smaller than the tooth side width dimension b of the tail tooth of the nth depth grooving broach, and the tooth side width dimension a of the tail tooth of the width groove expanding broach is larger than the tooth side width dimension b of the head tooth of the 1 st depth grooving broach.
2. The broach group structure for wheel disc mortise grooving according to claim 1, wherein the flank back taper amount of each deep grooving broach is 0.03-0.1 mm.
3. The broach assembly for roulette tongue-and-groove grooving according to claim 1, wherein the tooth lift per depth grooving broach is 0.03 to 0.08 mm.
4. The broach group structure for wheel disc mortise slotting according to claim 1, wherein the single-sided tooth lift of the width-expanded slotting broach is 0.02-0.06 mm.
5. The broach group structure for roulette tongue-and-groove grooving according to claim 1, wherein a width dimension a of a last tooth flank of the width-expanded groove broach is 0.3 to 1mm larger than a width dimension b of a first tooth flank of the 1 st depth grooving broach.
6. The broach group structure for wheel disc mortise grooving according to claim 1, wherein the upper and lower edges of the tooth sides of the two sides of the width-expanded groove broach are designed with chamfers c and are provided with relief angles.
7. The structure of claim 6 wherein the chamfer dimension c is greater than one-half the difference between the width dimension a of the end tooth flank of the expanded width broach and the width dimension b of the end tooth flank of the nth depth grooving broach.
8. The structure of claim 1, wherein the height dimension h of the leading tooth of the nth depth grooving broach is connected with the height dimension h of the trailing tooth of the (n-1) th depth grooving broach by the difference: plus or minus one tooth lift.
9. The structure of claim 1, wherein the side surfaces of the cutter bodies of the deep grooving broach and the wide grooving broach are respectively provided with a pressing V-shaped groove.
10. A method for grooving a mortise of a wheel disc, characterized by applying the structure of the broaching tool set for grooving a mortise of a wheel disc according to any one of claims 1 to 9, installing the broaching tool set in a broaching machine tool box, installing a broaching machine jig on a dividing disc of a broaching machine, and installing the wheel disc on the broaching machine jig; adjusting parameters of a broaching machine, and sequentially broaching all the mortises on the wheel disc; adjusting the radius value of the wheel disc, wherein each adjusting value e is smaller than the difference value between the height h of the last tooth of the nth depth slotting broach and the height h of the first tooth of the 1 st depth slotting broach, and broaching all the mortises on the wheel disc again; and repeating broaching for a plurality of times according to the design requirement of the broach group until the mortise is machined to the design requirement.
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