CN111015137B - Method for improving NVH (noise, vibration and harshness) performance of extended epicycloid hypoid gear - Google Patents
Method for improving NVH (noise, vibration and harshness) performance of extended epicycloid hypoid gear Download PDFInfo
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- CN111015137B CN111015137B CN201911387553.6A CN201911387553A CN111015137B CN 111015137 B CN111015137 B CN 111015137B CN 201911387553 A CN201911387553 A CN 201911387553A CN 111015137 B CN111015137 B CN 111015137B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/14—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass gear parts, e.g. gear wheels
Abstract
The invention discloses a method for improving NVH (noise, vibration and harshness) performance of an extended epicycloid hypoid gear, and aims to solve the problem that the conventional gear cannot reach the transmission NVH characteristic of a drive axle of a high-end passenger vehicle. The method comprises the following specific steps: step one, collecting a heat treatment deformation rule; designing a target contact area of a finished product; step three, performing pre-deformation design on the processed finished product before heat treatment; step four, obtaining a driving gear finished blank and a driven gear finished blank, processing the driving gear finished blank and the driven gear finished blank to obtain a tooth profile before heat treatment, correcting a processing error and cutting the tooth until the design requirements are met; step five, carrying out heat treatment on the product obtained in the step four, and installing an excircle, an end face and a hole; step six, performing hard tooth surface fine cutting on the product obtained in the step five; step seven, performing finish machining on the product obtained in the step six; and step eight, correcting the shape and the position of the contact area of the product obtained in the step seven. The finished product of the invention can meet the strict NVH performance requirements of the driving and driven gears of the drive axle of a high-end passenger vehicle.
Description
Technical Field
The invention relates to the field of gear machining, in particular to a method for improving NVH (noise, vibration and harshness) performance of an extended epicycloid hypoid gear.
Background
The gear is a mechanical element with a gear on a wheel rim which is continuously engaged to transmit motion and power, and is widely applied in the mechanical industry.
There are many types of gears, of which the extended epicycloidal hypoid gear is one. The existing extended epicycloid hypoid gear can not be ground after heat treatment, and can only reduce noise and improve stability through complete gear grinding of a gear pair. Even if the tooth profile is processed by adopting imported numerical control equipment before heat treatment, the tooth profile precision stably reaches 5 grades (GB11365-89), but due to the factors of low purity of domestic raw materials, the limitation of forging and heat treatment processes of forgings and the like, the tooth profile and the contact precision after heat treatment cannot meet the technical requirements of a tooth grinding process, and the transmission NVH characteristic of a high-end passenger vehicle drive axle cannot be achieved.
Disclosure of Invention
An object of an embodiment of the present invention is to provide a method for improving NVH performance of an extended epicycloidal hypoid gear, so as to solve the problems presented in the background art.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
a method for improving NVH performance of an extended epicycloid hypoid gear comprises the following specific steps: acquiring heat treatment deformation rules of raw materials of driving gears and driven gears in different batches under a normalizing heat treatment condition, and obtaining the heat treatment deformation rules of the raw materials of the driving gears and the driven gears in different batches under the normalizing heat treatment condition of the forge piece based on big data analysis;
designing a target contact area of a finished product and obtaining production parameters;
performing predeformation design on the machining of the finished product before heat treatment to generate working parameters before heat treatment, performing predeformation design on the machining of the driving gear and the driven gear before heat treatment by using the function of optimizing the mismatched tooth surface contact area of the American Gleason GEMS software, and generating soft tooth surface tooth shape machining parameters, grinding parameters and tooth shape detection parameters before heat treatment so as to obtain relatively stable hard tooth surface finishing allowance after heat treatment;
processing the driving gear and the driven gear to obtain a driving gear finished blank and a driven gear finished blank, then processing according to working parameters before heat treatment to obtain a tooth profile before heat treatment, correcting processing errors and cutting the teeth until the design requirements are met; processing the refined blanks of the driving gear and the driven gear by a numerical control lathe: grinding a hot front PENTAC PLUS RT cutter bar and coating the hot front PENTAC PLUS RT cutter bar on a BPG (Business process control) Grignard cutter tooth profile cutter according to cutter grinding parameters, mounting the hot front PENTAC PLUS RT cutter bar on a PENTAC PLUS RT cutter head, then processing a heat treatment front tooth profile on a 280C numerical control gear cutting machine, correcting processing errors by a tooth profile detection center, outputting machine tool deviation parameters, and then cutting teeth in the 280C numerical control gear cutting machine until the design requirements are met;
step five, carrying out heat treatment on the product obtained in the step four, and carrying out finish machining on the installed excircle, the end face and the hole to obtain a semi-finished product;
step six, performing hard tooth surface finish cutting on the semi-finished product, wherein a hard tooth surface finish cutting tool is specially designed according to Gleason Unical software, is clamped on a Gleason cutter tooth profile sharpening machine with the model of BPG according to tool grinding adjustment, coats a special coating on a cutting edge, and is provided with a cutter on a CB cutter installing machine, wherein the radial and axial runout of the cutting edge is not more than 0.0025 mm;
step seven, performing finish machining on the product obtained in the step six, mounting a base part on a 280C-type numerical control gear cutting machine in a finish machining mode, wherein the clamping mode is the same as that of clamping before heat treatment, measuring the space position of the tooth surface of the finish-cut gear by using a machine tool allowance distribution gauge, and controlling the machining allowance of each driven gear single-side cutter to be 0.04-0.06 mm; the non-driving surface of the driving gear is also subjected to fine cutting after single-side measurement by adopting a machine tool allowance distribution gauge, and the driving surface of the driving gear is subjected to fine cutting after the fine cutting by adopting the allowance distribution gauge so as to control the consistency of the tooth thickness; the machining error of the hardened tooth surface is corrected by adopting 9 x 15 points of a tooth surface grid;
and step eight, correcting the shape and the position of the contact area of the product obtained in the step seven, grinding the gear pair in a complete set, detecting that the first-order transmission error of a 360T numerical control rolling inspection machine is controlled within 10 mu rad, simultaneously increasing and controlling the 2 nd, 3 rd, 4 th and 5 th order transmission errors and the 10 th order high-order transmission error to prevent the occurrence of high-speed and low-frequency squeal abnormal noise of the whole vehicle, and correcting the shape and the position of the contact area according to an NVH test curve of a bridge assembly to obtain a finished product.
As a further scheme of the embodiment of the invention: and in the second step, the production parameters comprise parameters of the hard tooth surface finish cutting machine tool, monitoring data of the gear detection center and cutter grinding data, a required target contact area is designed by applying American Gleason GEMS software and Unical software, and the parameters of the hard tooth surface finish cutting machine tool, the monitoring data of the gear detection center and the cutter grinding data are generated.
Compared with the prior art, the embodiment of the invention has the beneficial effects that:
the invention calculates the fine cutting processing adjusting clamp and the special tool grinding adjusting clamp of the hard tooth surface of the extended epicycloid hypoid gear, respectively and independently controls the fine finishing allowance of the double surfaces of the tooth profile by utilizing the allowance distribution gauge, the consistency of the tooth shape errors of the processed driving gear and driven gear can be ensured, the tooth shape accuracy is controlled to be more than 5 grades (GB11365-89), the tooth surface shape error after heat treatment is corrected, the tooth grinding effect of the circular arc tooth gear can be achieved, the characteristics of stable transmission, low noise and high strength of the extended epicycloid quasi-bifilar gear can be maintained, the strict NVH performance requirements of the driving gear and the driven gear of a high-end passenger vehicle driving axle can be met, the method has wide use prospect, and the circular arc tooth system single-side processing method is creatively applied to the extended epicycloid quasi-bifilar gear, the difficulty of the uniformity of the hard tooth surface allowance is well solved, the abrasion of the cutter is small, and the cost is greatly reduced.
Drawings
FIG. 1 is a top plan view of a finished product of a method of improving NVH performance of an extended epicycloidal hypoid gear.
FIG. 2 is a side view of a finished product of the method of improving extended epicycloidal hypoid gear NVH performance.
Fig. 3 is a graph of an accelerated NVH test of a finished product application to a high-end passenger car axle assembly of the method for improving the NVH performance of the extended epicycloidal hypoid gear.
Fig. 4 is a graph of a finished product application to high-end passenger car axle assembly deceleration NVH test curve of the method for improving the extending epicycloid hypoid gear NVH performance.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
Example 1
A method for improving NVH performance of an extended epicycloid hypoid gear comprises the following specific steps: collecting heat treatment deformation rules of raw materials of driving gears and driven gears of different batches under normalizing heat treatment conditions;
designing a target contact area of a finished product and obtaining production parameters;
performing predeformation design on the machining of the finished product before heat treatment to generate working parameters before heat treatment, performing predeformation design on the machining of the driving gear and the driven gear before heat treatment by using the function of optimizing the mismatched tooth surface contact area of the American Gleason GEMS software, and generating soft tooth surface tooth shape machining parameters, grinding parameters and tooth shape detection parameters before heat treatment so as to obtain relatively stable hard tooth surface finishing allowance after heat treatment;
processing the driving gear and the driven gear to obtain a driving gear finished blank and a driven gear finished blank, then processing according to working parameters before heat treatment to obtain a tooth profile before heat treatment, correcting processing errors and cutting the teeth until the design requirements are met; processing the refined blanks of the driving gear and the driven gear by a numerical control lathe: grinding a hot front PENTAC PLUS RT cutter bar and coating the hot front PENTAC PLUS RT cutter bar on a BPG (Business process control) Grignard cutter tooth profile cutter according to cutter grinding parameters, mounting the hot front PENTAC PLUS RT cutter bar on a PENTAC PLUS RT cutter head, then processing a heat treatment front tooth profile on a 280C numerical control gear cutting machine, correcting processing errors by a tooth profile detection center, outputting machine tool deviation parameters, and then cutting teeth in the 280C numerical control gear cutting machine until the design requirements are met;
step five, carrying out heat treatment on the product obtained in the step four, and carrying out finish machining on the installed excircle, the end face and the hole to obtain a semi-finished product;
step six, performing hard tooth surface finish cutting on the semi-finished product, wherein a hard tooth surface finish cutting tool is specially designed according to Gleason Unical software, is clamped on a Gleason cutter tooth profile sharpening machine with the model of BPG according to tool grinding adjustment, coats a special coating on a cutting edge, and is provided with a cutter on a CB cutter installing machine, wherein the radial and axial runout of the cutting edge is not more than 0.0025 mm;
step seven, performing finish machining on the product obtained in the step six, mounting a base part on a 280C-type numerical control gear cutting machine in a finish machining mode, wherein the clamping mode is the same as that of clamping before heat treatment, measuring the space position of the tooth surface of the finish-cut gear by using a machine tool allowance distribution gauge, and controlling the machining allowance of each driven gear single-side cutter to be 0.04-0.06 mm; the non-driving surface of the driving gear is also subjected to fine cutting after single-side measurement by adopting a machine tool allowance distribution gauge, and the driving surface of the driving gear is subjected to fine cutting after the fine cutting by adopting the allowance distribution gauge so as to control the consistency of the tooth thickness; the machining error of the hardened tooth surface is corrected by adopting 9 x 15 points of a tooth surface grid;
and step eight, correcting the shape and the position of the contact area of the product obtained in the step seven to obtain a finished product, wherein the tooth profile precision of the finished product completely reaches 5 levels (GB11365-89), and the contact precision of the gear pair is achieved through a gear grinding process, so that the finished product is reduced, the competitiveness of the product is improved, and better economic benefit and social benefit are created.
Example 2
A method for improving NVH performance of an extended epicycloid hypoid gear comprises the following specific steps: step one, based on big data analysis, obtaining heat treatment deformation rules of raw materials of driving gears and driven gears of different batches under the heat treatment condition of normalizing the forged piece;
and step two, designing a required target contact area by using American Gleason GEMS software and Gleason Unical software, and generating hard tooth surface finish cutting machine parameters, gear detection center monitoring data and cutter sharpening data.
Performing predeformation design on the driving gear and the driven gear before heat treatment by using the function of optimizing the mismatched tooth surface contact area of the American Gleason GEMS software, and generating soft tooth surface tooth shape processing parameters, knife grinding parameters and tooth shape detection parameters before heat treatment so as to obtain relatively stable fine cutting allowance of the hard tooth surface after heat treatment;
fourthly, machining the refined blanks of the driving gear and the driven gear by a numerical control lathe; e) grinding a hot front PENTAC PLUS RT cutter bar and coating the hot front PENTAC PLUS RT cutter bar on a BPG (Business process control) Grignard cutter tooth profile cutter according to cutter grinding parameters, mounting the hot front PENTAC PLUS RT cutter bar on a PENTAC PLUS RT cutter head, then processing a heat treatment front tooth profile on a 280C numerical control gear cutting machine, correcting processing errors by a tooth profile detection center, outputting machine tool deviation parameters, and then cutting teeth in the 280C numerical control gear cutting machine until the design requirements are met;
step five, performing finish machining on the gear after heat treatment to install the excircle, the end face and the hole to obtain a semi-finished product;
step six, designing a hard tooth surface finish cutting tool according to the Grignard Unical software, adjusting and clamping the hard tooth surface finish cutting tool on a Grignard cutter tooth profile sharpening machine with BPG according to the tool grinding, coating a special coating on a cutting edge, and installing the tool on a CB tool installing machine, wherein the radial and axial runout of the cutting edge is not more than 0.0025 mm;
step seven, finish machining and mounting the base part on a 280C numerical control gear cutting machine, wherein the clamping mode is the same as the mode of clamping the workpiece before heat treatment, the space position of the tooth surface of the finish cutting tooth is measured by using a machine tool allowance distribution gauge, the finish cutting allowance of a single-sided cutter of the driven gear is positioned on the measured tooth surface, and the machining allowance of each piece is controlled to be 0.04-0.06 mm; the non-driving surface (backing and decelerating surface) of the driving gear is also subjected to fine cutting after single-side measurement by adopting a machine tool allowance distribution gauge, and the driving surface (accelerating surface) of the driving gear is subjected to fine cutting after the non-driving surface subjected to the fine cutting is measured by adopting the allowance distribution gauge so as to control the consistency of the tooth thickness; the machining error of the hardened tooth surface is corrected by adopting 9 x 15 points of a tooth surface grid;
step eight, gear pair complete set lapping, numerical control rolling inspection machine 360T detects first order transmission error and controls within 10 μ rad, increase and control 2 nd, 3 rd, 4 th, 5 th order transmission error and 10 th order high order transmission error at the same time, prevent the high-speed low-frequency squeal abnormal sound of the whole car, shape and position of contact area are corrected according to bridge assembly NVH test curve, the invention can solve the deficiency in the gear raw material, forging of forgeable piece and heat treatment process of our country well and restrict the characteristic such as being smooth and good, low-noise, high strength of the quasi-bifilar gear pair of the extension epicycloid in running; in particular, the invention has been successfully converted and applied to products in bulk, which can replace and be superior to original gear suppliers. The worldwide problems of high-speed 80-110 yard acceleration of the passenger car and high-speed accelerator-losing deceleration squeal are solved well.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (2)
1. A method for improving NVH performance of an extended epicycloid hypoid gear is characterized by comprising the following specific steps:
acquiring heat treatment deformation rules of raw materials of driving gears and driven gears in different batches under a normalizing heat treatment condition, and obtaining the heat treatment deformation rules of the raw materials of the driving gears and the driven gears in different batches under the normalizing heat treatment condition of the forge piece based on big data analysis;
designing a target contact area of a finished product and obtaining production parameters;
performing predeformation design on the machining of the finished product before heat treatment to generate working parameters before heat treatment, performing predeformation design on the machining of the driving gear and the driven gear before heat treatment by using the function of optimizing the mismatched tooth surface contact area of the American Gleason GEMS software, and generating soft tooth surface tooth shape machining parameters, grinding parameters and tooth shape detection parameters before heat treatment so as to obtain relatively stable hard tooth surface finishing allowance after heat treatment;
processing the driving gear and the driven gear to obtain a driving gear finished blank and a driven gear finished blank, then processing according to working parameters before heat treatment to obtain a tooth profile before heat treatment, correcting processing errors and cutting the teeth until the design requirements are met; processing the refined blanks of the driving gear and the driven gear by a numerical control lathe: grinding a hot front PENTAC PLUS RT cutter bar and coating the hot front PENTAC PLUS RT cutter bar on a PENTAC PLUS RT cutter disc by a Gleason cutter tooth profile grinding machine with the model of BPG according to the cutter grinding parameters, then processing the heat treatment front tooth profile on a numerical control gear cutting machine with the model of 280C, correcting the processing error by a tooth profile detection center, outputting machine tool deviation parameters, and then cutting teeth in the numerical control gear cutting machine with the model of 280C until the design requirements are met;
step five, carrying out heat treatment on the product obtained in the step four, and carrying out finish machining on the installed excircle, the end face and the hole to obtain a semi-finished product;
step six, performing hard tooth surface finish cutting on the semi-finished product, wherein a hard tooth surface finish cutting tool is specially designed according to Gleason Unical software, is clamped on a Griason cutter tooth profile sharpening machine with the model of BPG according to tool grinding adjustment, coats a special coating on a cutting edge, and is provided with a cutter on a CB cutter installing machine, wherein the radial and axial runout of the cutting edge is not more than 0.0025 mm;
step seven, performing finish machining on the product obtained in the step six, mounting a basic part on a 280C-type numerical control gear cutting machine during finish machining, measuring the space position of the tooth surface of the finish-cut gear by using a machine tool allowance distribution gauge in the same clamping mode as that of clamping a workpiece before heat treatment, and controlling the machining allowance of each driven gear to be 0.04-0.06mm, wherein the space position of the tooth surface of the finish-cut gear is measured by using a machine tool allowance distribution gauge; the non-driving surface of the driving gear is also subjected to fine cutting after single-side measurement by adopting a machine tool allowance distribution gauge, and the driving surface of the driving gear is subjected to fine cutting after the fine cutting by adopting the allowance distribution gauge so as to control the consistency of the tooth thickness; the machining error of the hardened tooth surface is corrected by adopting 9 x 15 points of a tooth surface grid;
and step eight, correcting the shape and the position of the contact area of the product obtained in the step seven, grinding the gear pair in a complete set, detecting that the first-order transmission error of a 360T numerical control rolling inspection machine is controlled within 10 mu rad, simultaneously increasing and controlling the 2 nd, 3 rd, 4 th and 5 th order transmission errors and the 10 th order high-order transmission error to prevent the occurrence of high-speed and low-frequency squeal abnormal noise of the whole vehicle, and correcting the shape and the position of the contact area according to an NVH test curve of a bridge assembly to obtain a finished product.
2. The method for improving the NVH performance of an extended epicycloidal hypoid gear according to claim 1, wherein the production parameters in step two comprise flank finishing machine parameters, gear inspection center monitoring data and tool sharpening data, the American Gleason GEMS software and Unical software are used for designing the required target contact area, and flank finishing machine parameters, gear inspection center monitoring data and tool sharpening data are generated.
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| EP1068912A2 (en) * | 1999-07-13 | 2001-01-17 | Kabushiki-Kaisha Kotani | Hypoid ring gear for differentials and method of producing the same |
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Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103331493B (en) * | 2013-07-11 | 2015-09-09 | 中信重工机械股份有限公司 | A kind of technique that can improve carburizing and quenching gear internal tooth tooth Profile Machining precision |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05169324A (en) * | 1991-12-20 | 1993-07-09 | Toyota Motor Corp | High strength hypoid gear |
| EP1068912A2 (en) * | 1999-07-13 | 2001-01-17 | Kabushiki-Kaisha Kotani | Hypoid ring gear for differentials and method of producing the same |
| CN102059406A (en) * | 2009-11-13 | 2011-05-18 | 福特汽车公司 | Face hob hypoid gear tooth top-land radius by common chamfer tool |
| CN103942396A (en) * | 2014-04-30 | 2014-07-23 | 武汉理工大学 | Helical-gear precise modeling method involving tooth alignment errors |
| CN105563054A (en) * | 2015-11-26 | 2016-05-11 | 陕西玉航电子有限公司 | Machining method for reducer gear shaft |
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