CN216990207U - Concentric structure helical spline broach - Google Patents
Concentric structure helical spline broach Download PDFInfo
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- CN216990207U CN216990207U CN202123258849.3U CN202123258849U CN216990207U CN 216990207 U CN216990207 U CN 216990207U CN 202123258849 U CN202123258849 U CN 202123258849U CN 216990207 U CN216990207 U CN 216990207U
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Abstract
The utility model discloses a concentric structure helical spline broach, which comprises a front handle, spline cutting teeth, round hole cutting teeth and a rear handle which are arranged from front to back, wherein a conical cylindrical guide part and press polish teeth are sequentially arranged between the spline cutting teeth and the round hole cutting teeth; the spline cutting teeth are spiral spline cutting teeth, and the front handle, the spline cutting teeth, the conical cylindrical guide part, the press polish teeth, the round hole cutting teeth and the rear handle are sequentially connected in a front-back mode and are coaxial. The utility model separates the small-diameter cutting teeth from the spline cutting teeth, and adds the press polish teeth and the tapered cylindrical guide part in front of the small-diameter cutting teeth so as to improve the coaxiality precision of the small diameter and the spline (large diameter) of the workpiece and achieve the effect of improving the precision of the workpiece after broaching.
Description
Technical Field
The utility model relates to a concentric structure helical spline broach.
Background
At present, the broaching process is mainly adopted for machining the inner helical teeth, is an efficient machining process integrating hobbing, gear shaving and milling processes, has higher machining precision, and is widely applied to various industrial fields including the automobile industry. Meanwhile, in order to enable the small diameter of the workpiece after broaching and the involute tooth form (large diameter) to have higher coaxiality, the spiral broach cutting teeth generally adopt a small-diameter centering structure (the small-diameter cutting teeth and the large-diameter cutting teeth are arranged in a staggered mode one by one), so that the small-diameter cutting teeth and the spline cutting teeth of the broach must adopt a spiral chip pocket form, the spiral broach design needs to control the selection range of the number of chip pockets of the broach, the spiral broach structural design is limited more, and meanwhile, the spiral broach with the structure is high in manufacturing difficulty, long in period, high in equipment requirement and high in cost.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model aims to provide a concentric structure helical spline broach, which separates a small-diameter cutting tooth from a spline cutting tooth, and adds a press polish tooth and a guide part in front of the small-diameter cutting tooth so as to improve the coaxiality precision of the small diameter and the spline (large diameter) of a workpiece and achieve the effect of improving the precision of the workpiece after broaching.
In order to solve the technical problems, the utility model adopts the following technical scheme:
a concentric structure helical spline broach comprises a front handle, spline cutting teeth, round hole cutting teeth and a rear handle which are arranged from front to back, wherein a conical cylindrical guide part and press polish teeth are sequentially arranged between the spline cutting teeth and the round hole cutting teeth; the spline cutting teeth are spiral spline cutting teeth, and the front handle, the spline cutting teeth, the conical cylindrical guide part, the press polish teeth, the round hole cutting teeth and the rear handle are sequentially connected in a front-back mode and are coaxial.
The utility model also comprises the following technical characteristics:
optionally, an involute spline groove is formed in the front shank.
Optionally, the involute spline groove parameters are as follows:
normal modulus Mn：Mn＝Db/10；
Number of teeth Z: when D is presentbWhen the value is less than or equal to 60, Z is 4; when D is presentb＞60，Z＝6；
The pressure angle is 30 degrees;
major diameter D of splinea：Da＝Db；
Minor diameter D of splinef：Df＝Db-2.25Mn；
Arc tooth space width S in normal direction of cyclotomic circlen：Sn＝π×Mn/2+1；
Wherein: dbIs the diameter of the front handle.
Optionally, the tapered cylindrical guide portion includes a tapered section connected to the spline cutting teeth and a cylindrical section connecting the tapered section, wherein a reduced diameter end of the tapered section is connected to the spline cutting teeth.
Optionally, the parameters of the tapered cylindrical guide are as follows:
width L ═ L of conical cylindrical guide part0/3]The width of the conical cylindrical guide part is the sum of the axial lengths of the conical section and the cylindrical section;
front guide angle of conical section
Cylinder section guiding toughness band width l: l is 2-3;
cylindrical section guide outer diameter Dy：
Wherein: l0The broaching length of the workpiece with the inner helical teeth; d0The lower aperture difference of the workpiece before drawing;
the roundness error of the aperture of the workpiece before drawing; []Indicating that the result is rounded up nearby.
Optionally, the calendering teeth are cylindrical, and the outer wall of the calendering teeth is provided with a plurality of annular chip flutes which are arranged along the axial direction.
Optionally, the parameters of the calendering teeth are as follows:
front angle of press polish tooth
Press polish tooth pitch Lg：Lg＝[l0/10]；
Width of press finished tooth edge beltg：lg＝(0.25-0.3)×Lg；
External diameter D of first tooth of calendering toothg1：Dg1＝D0；
Outer diameter D of the last tooth of the press polished toothgn：Dgn＝D0u-C/3；
Number of press polished teeth Ng：Ng＝[(Dgn-Dg1)/fg]；
Depth h of chip pocketg：hg＝(0.2-0.25)×Lg；
Chip pocket opening angle thetagIs 60 degrees;
wherein l0The broaching length of the workpiece with the inner helical teeth; d0The lower aperture difference of the workpiece before drawing; d0uDrawing the upper difference of the front hole for the workpiece; c is the dimensional tolerance of the hole before drawing the workpiece, fgThe tooth lifting amount of the press polishing teeth is shown.
Optionally, the circular bore cutting teeth are annular cutting teeth.
Compared with the prior art, the utility model has the following technical effects:
(1) the utility model ensures that the concentricity of the minor diameter and the rounding of the internal spline after broaching is less than 0.01mm through the cylindrical guide part and the press polish teeth, and ensures the precision requirement of the precision measurement reference.
(2) The small-diameter broaching teeth and the spline broaching teeth are separated through the cylindrical guide part and the press polish teeth, the small-diameter broaching teeth can adopt an annular tooth structure, the manufacturing difficulty of the broaching tool is reduced, and simultaneously, the manufacturing cost of the broaching tool is reduced by 20 percent, so that the cost of a single tool of the broaching tool is reduced.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the front handle structure and a sectional view A-A thereof;
FIG. 3 is a schematic structural view of a conical cylindrical guide part;
FIG. 4 is a schematic diagram of a calendering tooth structure.
The meaning of the individual reference symbols in the figures is:
A. the gear comprises a front handle, a spline cutting tooth, a conical cylindrical guide part, a press polish tooth, a round hole cutting tooth and a rear handle.
Detailed Description
The utility model designs a concentric spiral broach of brand-new structure, this kind of structure spiral broach separates path cutting teeth and spline cutting teeth, increase several rows of press polish teeth and one section toper cylinder direction before the path cutting teeth, its cutting part divide into in proper order promptly → round hole direction → spline cutting teeth → toper cylinder direction → press polish tooth direction → round hole cutting teeth → back handle, after the spiral broach accomplishes the cutting spline, toper cylinder direction and round hole press polish tooth structure carry out the secondary direction alignment to the work piece, thereby improve the axiality precision of work piece path and spline (major diameter), reach the effect that improves the broaching back work piece precision.
The following embodiments of the present invention are provided, and it should be noted that the present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention are within the protection scope of the present invention.
Example 1:
as shown in fig. 1 to 4, the present embodiment provides a concentric helical spline broach, and the design method of the broach used in the present embodiment is the same as the conventional design method except for the following design methods; the units of the following calculation parts are all millimeters;
the spiral spline broach with the concentric structure comprises a front handle A, spline cutting teeth B, round hole cutting teeth E and a rear handle F which are arranged from front to back, wherein a conical cylindrical guide part C and calendaring teeth D are sequentially arranged between the spline cutting teeth B and the round hole cutting teeth E; the spline cutting teeth B are spiral spline cutting teeth, and the front handle A, the spline cutting teeth B, the conical cylindrical guide part C, the press polish teeth D, the round hole cutting teeth E and the rear handle F are sequentially connected in a front-back mode and are coaxial.
As shown in fig. 2, the front handle a is provided with involute spline grooves, in this embodiment, four involute spline grooves are uniformly distributed along the circumference of the front handle a, and when the spiral broach is used, the broach and the workpiece need to have relative rotation motion, generally, the workpiece is fixed, and the broach rotates, so the broach handle needs to be specially designed. In order to ensure that the handle part of the broach is stressed uniformly and stably, four involute spline grooves are designed on the front handle part in the embodiment.
The diameter of the handle part of the broach and the design of other sizes and tolerances can be selected according to the parameters of a machine tool chuck used by the broach and the sizes and tolerances of the national standard structure, and aiming at the involute spline groove with a special structure, the parameters of the involute spline groove are as follows:
normal modulus Mn：Mn＝Db/10；
Number of teeth Z: when D is presentbWhen the value is less than or equal to 60, Z is 4; when D isb＞60，Z＝6；
The pressure angle is 30 degrees;
major diameter D of splinea：Da＝Db；
Minor diameter D of splinef：Df＝Db-2.25Mn；
Arc tooth slot width S in normal direction of cyclotomic ringn：Sn＝π×Mn/2+1；
Wherein: dbThe diameter of the front handle.
As shown in fig. 3, the tapered cylindrical guide portion C includes a tapered section connected to the spline cutting tooth B and a cylindrical section connected to the tapered section, wherein the small diameter end of the tapered section is connected to the spline cutting tooth B, and the large diameter end of the tapered section is connected to the cylindrical section and has the same diameter as the cylindrical section; the effect of toper cylinder guide part is when the spline cutting tooth is about to accomplish the spline cutting, and toper cylinder guide part gets into the work piece hole, plays the effect of fixed work piece and broach relative position.
Specifically, the parameters of the tapered cylindrical guide portion C are as follows:
width L ═ L of conical cylindrical guide part0/3](generally, for the sake of simple calculation, the value can be 20), the width of the conical cylindrical guide part is the sum of the axial lengths of the conical section and the cylindrical section;
front guide angle of conical section
The cylindrical guide front angle is an included angle between the outer wall of the conical section and the central axis;
cylinder section guiding toughness band width l: l is 2-3;
cylindrical section guide outer diameter Dy：
Wherein: l. the0The broaching length of the workpiece with the inner helical teeth; d0The lower aperture difference of the workpiece before drawing;
the roundness error of the aperture of the workpiece before drawing; []Indicating that the result is rounded up nearby.
As shown in fig. 4, the calendering tooth D is cylindrical, and the outer wall thereof is provided with a plurality of annular chip flutes which are arranged along the axial direction; the press polish tooth is used for further guiding the workpiece and has a supporting effect, so that the broach smoothly and stably transits from the spline tooth to the round hole tooth.
Specifically, the parameters of the press polish tooth D are as follows:
press polish tooth front angle
Can be properly made small, namely
Press polish tooth pitch Lg：Lg＝[l0/10]；
Width of press polish tooth bladeg：lg＝(0.25-0.3)×Lg(ligament widths typically do not exceed 3 nn);
external diameter D of first tooth of calendering toothg1：Dg1＝D0；
Outer diameter D of the last tooth of the press polished toothgn：Dgn＝D0u-C/3；
Number of press polished teeth Ng：Ng＝[(Dgn-Dg1)/fg]；
Depth h of chip pocketg：hg＝(0.2-0.25)×Lg；
Chip flute opening angle thetagIs 60 °;
wherein l0The broaching length of the workpiece with the inner helical teeth; d0The lower aperture difference of the workpiece before drawing; d0uDrawing the upper difference of the front hole for the workpiece; c is the dimensional tolerance of the hole before drawing the workpiece, fgFor calendering the tooth lifting amount (generally, 0.005 is desirable in design).
Round hole cutting teeth E are annular cutting teeth, and through the design of toper cylinder direction and press the optical tooth structure, then spline cutting teeth can be separated with the round hole cutting teeth and come, then the round hole tooth can design annular cutting teeth to reduce the manufacturing degree of difficulty and cutter cost, traditional round hole broach design can be referred to in its design process.
And (4) combining the traditional design method to complete the design of other parameters of the involute spline broach.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications all fall within the protection scope of the present invention.
It should be noted that the various features described in the foregoing embodiments may be combined in any suitable manner without contradiction. The utility model is not described in detail in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (8)
1. A concentric structure helical spline broach comprises a front handle (A), spline cutting teeth (B), round hole cutting teeth (E) and a rear handle (F) which are arranged from front to back, and is characterized in that a conical cylindrical guide part (C) and calendaring teeth (D) are sequentially arranged between the spline cutting teeth (B) and the round hole cutting teeth (E); spline cutting teeth (B) are spiral spline cutting teeth, and a front handle (A), the spline cutting teeth (B), a conical cylindrical guide part (C), press polish teeth (D), round hole cutting teeth (E) and a rear handle (F) are sequentially connected in the front and back direction and are coaxial.
2. The concentric helical spline broach according to claim 1, wherein the front shank (a) is provided with involute spline grooves.
3. The concentric helical spline broach according to claim 2, wherein said involute spline grooves have the following parameters:
normal modulus Mn：Mn＝Db/10；
Number of teeth Z: when D is presentbWhen the value is less than or equal to 60, Z is 4; when D is presentb＞60，Z＝6；
The pressure angle is 30 °;
major diameter D of splinea：Da＝Db；
Minor diameter D of splinef：Df＝Db-2.25Mn；
Arc tooth slot width S in normal direction of cyclotomic ringn：Sn＝π×Mn/2+1；
Wherein: dbThe diameter of the front handle.
4. The concentric helical spline broach according to claim 1, wherein the tapered cylindrical guide part (C) comprises a conical section connected to the spline cutting teeth (B) and a cylindrical section connecting the conical sections, wherein the small diameter end of the conical section is connected to the spline cutting teeth (B) and the large diameter end of the conical section is connected to the cylindrical section and has the same diameter as the cylindrical section.
5. The concentric arrangement helical spline broach according to claim 4, characterized in that the parameters of the conical cylindrical guide part (C) are as follows:
width L ═ L of conical cylindrical guide part0/3]The width of the conical cylindrical guide part is the sum of the axial lengths of the conical section and the cylindrical section;
front guide angle of conical section
Cylinder section guiding toughness band width l: 2-3, unit millimeter;
cylindrical section guide outer diameter Dy：
Wherein: l. the0The broaching length of the workpiece with the inner helical teeth; d0The lower aperture difference of the workpiece before drawing;
the roundness error of the aperture of the workpiece before drawing; []Indicating that the result is rounded up nearby.
6. The concentric helical spline broach according to claim 1, wherein the calendering teeth (D) are cylindrical and the outer wall thereof is provided with a plurality of annular chip flutes, which are arranged in the axial direction.
7. The concentric structured helical spline broach according to claim 6, in which the parameters of the calendering teeth (D) are as follows:
press polish tooth front angle
Press polish tooth pitch Lg：Lg＝[l0/10]；
Width of press polish tooth bladeg：lg＝(0.25-0.3)×Lg；
External diameter D of first tooth of calendering toothg1：Dg1＝D0；
Outer diameter D of the last tooth of the press polished toothgn：Dgn＝D0u-C/3；
Number of press polished teeth Ng：Ng＝[(Dgn-Dg1)/fg]；
Depth h of chip pocketg：hg＝(0.2-0.25)×Lg；
Chip pocket opening angle thetagIs 60 degrees;
wherein l0The broaching length of the workpiece with the inner helical teeth; d0The lower aperture difference of the workpiece before drawing; d0uDrawing the upper difference of the front hole for the workpiece; c is the dimensional tolerance of the hole before drawing the workpiece, fgThe tooth lifting amount is the burnishing tooth lifting amount.
8. The concentric configuration helical spline broach according to claim 1, in which the round hole cutting teeth (E) are annular cutting teeth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123258849.3U CN216990207U (en) | 2021-12-20 | 2021-12-20 | Concentric structure helical spline broach |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123258849.3U CN216990207U (en) | 2021-12-20 | 2021-12-20 | Concentric structure helical spline broach |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216990207U true CN216990207U (en) | 2022-07-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123258849.3U Active CN216990207U (en) | 2021-12-20 | 2021-12-20 | Concentric structure helical spline broach |
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| CN (1) | CN216990207U (en) |
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- 2021-12-20 CN CN202123258849.3U patent/CN216990207U/en active Active
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| TR01 | Transfer of patent right |
Effective date of registration: 20230714 Address after: No. 116, Wenxing Road, Qindu District, Xianyang, Shaanxi 712099 Patentee after: Shaanxi Fashte Intelligent Brake System Co.,Ltd. Address before: No. 129, West Avenue, high tech Zone, Xi'an, Shaanxi 710000 Patentee before: SHAANXI FAST AUTO DRIVE Group Co. |