CN209256013U - A kind of salient angle type hobboing cutter - Google Patents
A kind of salient angle type hobboing cutter Download PDFInfo
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- CN209256013U CN209256013U CN201821678352.2U CN201821678352U CN209256013U CN 209256013 U CN209256013 U CN 209256013U CN 201821678352 U CN201821678352 U CN 201821678352U CN 209256013 U CN209256013 U CN 209256013U
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- 238000005520 cutting process Methods 0.000 claims abstract description 63
- 230000007704 transition Effects 0.000 claims description 20
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000005452 bending Methods 0.000 description 5
- 238000003754 machining Methods 0.000 description 4
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Abstract
The utility model relates to a kind of salient angle type hobboing cutter, the production method for mainly solving the problem of the existing salient angle type involute hob when SAP is round excessive with Df circle difference in gear parameter can not effectively guarantee SAP, Df and thickness at root of tooth.Salient angle type hobboing cutter includes the addendum circle arc set gradually, linear cutting edge, transitional cut sword and main cutting edge, and linear cutting edge is arranged in parallel with main cutting edge, and linear cutting edge and the tangent setting of addendum circle arc.
Description
Technical Field
The utility model relates to a hobbing cutter technique, concretely relates to salient angle type hobbing cutter.
Background
In the design of the convex lobe type involute hob, the parameter design of a convex lobe part must simultaneously ensure that a product has a hobbing involute initial circle diameter (SAP), a tooth root circle diameter (Df) and a tooth root thickness which meet the design requirements after being processed. When the difference between SAP and Df required in the product parameters is too large, exceeding more than 20% of the total tooth height, it is not possible to simultaneously guarantee SAP, Df and tooth root thickness according to the conventional hob manufacturing method. The existing widely adopted compromise manufacturing methods have two kinds: one way to reduce the SAP diameter to ensure Df and root thickness, as shown in figures 1 and 2, is to reduce the length of the product transition curve, increase the curvature, increase the risk of stress concentration, and not comply with the product design requirements; another method is to increase the lobe thickness d of the hob as shown in fig. 3 and 4, which can ensure Df and SAP, but reduce the root thickness of the product, reduce the bending strength of the tooth root of the gear, and increase the risk of tooth breakage of the gear.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the problem that SAP, Df and tooth root thickness can not be effectively guaranteed simultaneously to the manufacturing method of current salient angle type involute hob, provide a salient angle type hob.
The technical scheme of the utility model is that:
a salient hob comprises an addendum arc, a linear cutting edge, a transition cutting edge and a main cutting edge which are sequentially arranged, wherein the linear cutting edge is arranged in parallel with the main cutting edge, and the linear cutting edge is arranged in a tangent manner with the addendum arc;
the vertical distance between the lower end of the linear cutting edge and the top end of the addendum circular arc is b;
b＝Ha0-sin(αt)×(d1×sin(αt)/2-ρtmin+ΔL)
wherein Ha0The tooth root of the gear is high;
αtis the gear end face pressure angle;
d1the diameter of the pitch circle of the gear;
ρtminthe radius of curvature is corresponding to the involute initial circle of the gear;
delta L is the gear hobbing overrun amount;
the straight cutting edge is parallel to the main cutting edge at a distance d,
d＝(dwH×sin(αbw)/2+hg×tan(αn)-d1×(αbw+ewhs)/2)×cos(β1)×cos(αn)
wherein,
dwHthe diameter of the starting circle of the effective involute of the gear;
dbthe diameter of the pitch circle of the gear;
αbwis a gear dwHThe width of the tooth groove on the circle is half of the central angle;
hg is the distance from the initial position of the salient angle of the hob to the nodal line of the hob;
αnis the gear normal pressure angle;
ewhsis a gear dwHThe difference of the involute angles corresponding to the circle and the gear circle;
β1a cycloidal helix angle of the gear;
the radius value of the hob salient tooth crest circular arc is R;
R＝(S0n×cos(αn)/2-Ha0×sin(αn)+d)/(1-sin(αn))
wherein S is0nThe gear is divided into a circle by the normal direction and the tooth groove is wide;
αnis the gear normal pressure angle;
the vertical distance between the upper end of the linear cutting edge and the top end of the addendum arc is a;
a＝R×(1-sin(αn))
wherein R is the radius of the circular arc of the hob top;
the vertical distance between the lower end of the transition cutting edge and the top end of the addendum circular arc is c;
c＝b+d/(tan(αn)-tan(α’n))
wherein, α'nThe normal pressure angle of the cutting edge is changed for the hob.
Compared with the prior art, the utility model, following technological effect has:
1. by adopting the hobbing cutter of the utility model, the involute initial circle diameter (SAP), the tooth root circle diameter (Df) and the tooth root thickness of the product required by the gear can be accurately ensured during processing the product; meanwhile, the length of the transition curve of the tooth root is not shortened, and the probability of transition curve interference is avoided; because the straight line added in the convex angle structure is parallel to the main cutting edge of the hob, the transition curve part of the product processed by the straight line is parallel to the involute of the finished tooth surface, the tooth thickness of the product can be ensured to the maximum extent, and the bending strength of the designed tooth root of the gear is ensured.
2. The utility model discloses in the salient angle structure of salient angle type hobbing cutter that gradually bursts at seams, increase one section and the parallel straight line cutting edge of hobbing cutter main cutting edge, the upper end is tangent with the addendum circular arc, and the lower extreme extends to the hobbing that the product required the initial circle that gradually bursts at seams corresponds position department. When the hob is used for processing products, the SAP, Df and the thickness of the tooth root of the hob can be effectively guaranteed to meet the design requirements of the products, the length of a transition curve of the products cannot be shortened, and the probability of transition curve interference is avoided.
3. The utility model discloses the sharp cutting edge that increases is parallel with hobbing cutter main cutting edge, so the transition curve portion of sharp cutting edge product of processing is the equidistance line of finish machining flank of tooth, can not interfere with finish machining meshing line, the design tooth root bending strength of maximum assurance tooth root thickness and gear.
Drawings
FIG. 1 is a schematic view of a prior art hob tooth shape to reduce SAP diameter;
FIG. 2 is a schematic view of the tooth shape of a product machined using a reduced SAP diameter hob;
FIG. 3 is a schematic view of a prior art hob tooth shape to increase the thickness of the hob lobe;
FIG. 4 is a schematic view of the tooth shape of a product machined using a hob of increased lobe thickness;
FIG. 5 is a schematic view of a convex angle plus straight line structure of the present invention;
FIG. 6 is a schematic view of the tooth shape of the hob-processed product of the present invention;
fig. 7 is the schematic diagram of the relevant parameters of the convex angle and linear hob of the present invention.
Reference numerals: 1-addendum arc, 2-linear cutting edge, 3-transition cutting edge, 4-main cutting edge.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific examples:
the utility model discloses according to the generating principle of gear hobbing processing, in the salient angle structure of hobbing cutter, increase one section and the parallel straight line cutting edge of hobbing cutter main cutting edge, accomplish the most molding cutting of transition curve by this section straight line portion, adopt the product of this kind of hobbing cutter structrual processing, can protect SAP, Df and tooth root thickness of gear design requirement simultaneously to do not reduce the transition curve length of product, guarantee that the tooth root bending strength of gear does not reduce.
The upper end of the added linear cutting edge is tangent with the tooth crest arc, and the lower end extends to the position corresponding to the gear hobbing involute initial circle required by the product. By adopting the hob in the form, when a product is processed, the SAP, Df and the thickness of the tooth root of the hob can be effectively ensured to meet the design requirement of the product, and the length of a transition curve of the product cannot be shortened; meanwhile, the straight line added in the convex angle structure is parallel to the main cutting edge of the hob, so that the transition curve part of a product processed by the straight line at the section is an equidistant line of a finish machining tooth surface, the interference with a finish machining meshing line is avoided, the thickness of a tooth root is ensured to the maximum extent, and the designed tooth root bending strength of the gear is ensured.
In the case of the known gear design parameters in which the difference between the involute starting circle diameter (SAP) and the root circle diameter (Df) is too large, the crowning hob is designed according to the gear parameters.
Lobe plus straight hob design the design of the remaining parameters are the same as the conventional design except for the parameters labeled in fig. 7. The convex hob shown in fig. 5, 6 and 7 comprises an addendum arc 1, a linear cutting edge 2, a transition cutting edge 3 and a main cutting edge 4 which are sequentially arranged, wherein the linear cutting edge is arranged in parallel with the main cutting edge, and the linear cutting edge is arranged in a tangent manner with the addendum arc; the hob has the advantages that the machined product is guaranteed to have a proper involute initial diameter, a tooth root digging amount and a tooth root circle diameter required by the product.
The vertical distance between the lower end of the linear cutting edge and the top end of the addendum circular arc is b (the value of the ending height b of the linear added by the convex angle of the hob);
b＝Ha0-sin(αt)×(d1×sin(αt)/2-ρtmin+ΔL)
wherein Ha0The tooth top height of the hob is equal to the tooth root height of the gear;
αtis the gear end face pressure angle;
d1the diameter of the pitch circle of the gear;
ρtminthe radius of curvature is corresponding to the involute initial circle of the gear;
delta L is the gear hobbing overrun amount;
the parallel distance between the straight cutting edge and the main cutting edge is d (the thickness d value of the convex angle of the hob is calculated),
d＝(dwH×sin(αbw)/2+hg×tan(αn)-d1×(αbw+ewhs)/2)×cos(β1)×cos(αn)
wherein,
dwHthe diameter of the starting circle of the effective involute of the gear;
dbthe diameter of the pitch circle of the gear;
αbwis a gear dwHThe width of the tooth groove on the circle corresponds to half of the central angle;
αnis the gear normal pressure angle;
ewhsis a gear dwHThe difference of the involute angles corresponding to the circle and the gear circle;
β1a cycloidal helix angle of the gear;
the radius value of the hob salient tooth crest circular arc is R;
R＝(S0n×cos(αn)/2-Ha0×sin(αn)+d)/(1-sin(αn))
wherein S is0nThe normal tooth thickness of the hob is equal to the tooth groove width of the gear circle;
Ha0the tooth top height of the hob is equal to the tooth root height of the gear;
the vertical distance between the upper end of the linear cutting edge and the top end of the addendum arc is a (calculating the initial height a value of the linear added by the convex angle of the hob);
a＝R×(1-sin(αn))
wherein R is the radius of the circular arc of the hob top;
the vertical distance between the lower end of the transition cutting edge and the top end of the addendum circular arc is c (the end height c of the transition cutting edge of the hob is calculated);
c＝b+d/(tan(αn)-tan(α’n))
α'nthe normal pressure angle of the cutting edge is typically (α) for the hob transitionn-5)。
And simultaneously, the utility model also provides a manufacturing method of salient angle type hobbing cutter, including following step:
1) acquiring known parameters of the gear;
gear tooth root height Ha0Gear face pressure angle αtDiameter d of gear reference circle1Curvature radius rho corresponding to gear involute initial circletminGear hobbing overrun amount delta L and diameter d of effective involute starting circle of gearwHDiameter d of gear reference circleb、dwHThe width of the tooth groove on the circle corresponds to half of the central angle of αbwGear normal pressure angle αn、dwHThe difference of the involute angle between the circle and the gear circle is ewhsCycloidal helix angle β of gear1Tooth groove width S of gear cyclotomic circle0n；
2) Calculating parameters of the convex angle type hob according to the parameters in the step 1);
2.1) the vertical distance b between the lower end of the linear cutting edge and the top end of the addendum circular arc;
b＝Ha0-sin(αt)×(d1×sin(αt)/2-ρtmin+ΔL)
2.2) the parallel distance d of the straight cutting edge and the main cutting edge;
d＝(dwH×sin(αbw)/2+hg×tan(αn)-d1×(αbw+ewhs)/2)×cos(β1)×cos(αn)
2.3) radius value R of the convex-angle tooth crest circular arc of the hob;
R＝(S0n×cos(αn)/2-Ha0×sin(αn)+d)/(1-sin(αn))
2.4) the vertical distance a between the upper end of the linear cutting edge and the top end of the addendum arc;
a＝R×(1-sin(αn))
2.5) the vertical distance c between the transition cutting edge and the top end of the addendum circular arc;
c＝b+d/(tan(αn)-tan(α’n))
3) and processing the convex hob according to the parameters obtained in the step 2).
In the above steps, the step 2.1) and the step 2.2) may not be in sequence, and the step 2.4) and the step 2.5) may not be in sequence.
The lobe plus straight hob design can be completed according to the above embodiments.
Claims (2)
1. A lobe-type hob characterized in that: the cutting tool comprises a tooth crest circular arc (1), a linear cutting edge (2), a transition cutting edge (3) and a main cutting edge (4) which are sequentially arranged, wherein the linear cutting edge (2) and the main cutting edge (4) are arranged in parallel, and the linear cutting edge (2) and the tooth crest circular arc (1) are arranged in a tangent manner;
the vertical distance between the lower end of the linear cutting edge (2) and the top end of the addendum arc (1) is b;
b＝Ha0-sin(αt)×(d1×sin(αt)/2-ρtmin+ΔL)
wherein Ha0The tooth root of the gear is high;
αtis the gear end face pressure angle;
d1the diameter of the pitch circle of the gear;
ρtminthe radius of curvature is corresponding to the involute initial circle of the gear;
delta L is the gear hobbing overrun amount;
the parallel distance between the straight cutting edge (2) and the main cutting edge (4) is d,
d＝(dwH×sin(αbw)/2+hg×tan(αn)-d1×(αbw+ewhs)/2)×cos(β1)×cos(αn) Wherein,
dwHthe diameter of the starting circle of the effective involute of the gear;
dbthe diameter of the pitch circle of the gear;
αbwis a gear dwHThe width of the tooth groove on the circle is half of the central angle;
hg is the distance from the initial position of the salient angle of the hob to the nodal line of the hob;
αnis the gear normal pressure angle;
ewhsis a gear dwHThe difference of the involute angles corresponding to the circle and the gear circle;
β1a cycloidal helix angle of the gear;
the radius value of the hob salient tooth crest circular arc (1) is R;
R＝(S0n×cos(αn)/2-Ha0×sin(αn)+d)/(1-sin(αn))
wherein S is0nThe gear is divided into a circle by the normal direction and the tooth groove is wide;
αnis the gear normal pressure angle;
the vertical distance between the upper end of the linear cutting edge (2) and the top end of the addendum arc (1) is a;
a＝R×(1-sin(αn))
wherein R is the radius of the circular arc of the hob top;
the vertical distance between the lower end of the transition cutting edge (3) and the top end of the addendum arc (1) is c;
c＝b+d/(tan(αn)-tan(α ' n))
wherein, α'nThe normal pressure angle of the cutting edge is changed for the hob.
2. A lobe-type hob according to claim 1, characterized in that the hob transition cutting edge normal pressure angle is α'nHas a value ofn-5。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821678352.2U CN209256013U (en) | 2018-10-16 | 2018-10-16 | A kind of salient angle type hobboing cutter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821678352.2U CN209256013U (en) | 2018-10-16 | 2018-10-16 | A kind of salient angle type hobboing cutter |
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| CN209256013U true CN209256013U (en) | 2019-08-16 |
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| CN201821678352.2U Withdrawn - After Issue CN209256013U (en) | 2018-10-16 | 2018-10-16 | A kind of salient angle type hobboing cutter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109304524A (en) * | 2018-10-16 | 2019-02-05 | 西安法士特汽车传动有限公司 | A kind of salient angle type hobboing cutter and preparation method thereof |
| CN114769741A (en) * | 2022-03-28 | 2022-07-22 | 陕西法士特齿轮有限责任公司 | Addendum full-circular-arc hob and design method thereof |
-
2018
- 2018-10-16 CN CN201821678352.2U patent/CN209256013U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109304524A (en) * | 2018-10-16 | 2019-02-05 | 西安法士特汽车传动有限公司 | A kind of salient angle type hobboing cutter and preparation method thereof |
| CN109304524B (en) * | 2018-10-16 | 2024-01-02 | 西安法士特汽车传动有限公司 | Convex angle type hob and manufacturing method thereof |
| CN114769741A (en) * | 2022-03-28 | 2022-07-22 | 陕西法士特齿轮有限责任公司 | Addendum full-circular-arc hob and design method thereof |
| CN114769741B (en) * | 2022-03-28 | 2024-01-02 | 陕西法士特齿轮有限责任公司 | Full-arc hob with tooth tops and design method thereof |
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Granted publication date: 20190816 Effective date of abandoning: 20240102 |
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