CN110509115B - High-precision grinding process and application of slender shaft - Google Patents
High-precision grinding process and application of slender shaft Download PDFInfo
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- CN110509115B CN110509115B CN201910794447.3A CN201910794447A CN110509115B CN 110509115 B CN110509115 B CN 110509115B CN 201910794447 A CN201910794447 A CN 201910794447A CN 110509115 B CN110509115 B CN 110509115B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
- B24B5/36—Single-purpose machines or devices
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Abstract
The invention relates to the technical field of slender shaft processing, and discloses a high-precision grinding process and application of a slender shaft, wherein the grinding process comprises the process steps of equipment modification, prefabrication of a reference ring, installation of the reference ring, clamping and positioning of the slender shaft, setting of a slender shaft correcting position, measurement of a correcting position size, grinding of the excircle of the reference ring, correction of an upper bus and a side bus, grinding of the excircle of the slender shaft and the like; the device modification process comprises the steps that a numerical control cylindrical grinding machine is adopted as a device for grinding the outer circle of the slender shaft, and an upper bus dial indicator for correcting the upper bus of the slender shaft is installed on a grinding wheel spindle box of the numerical control cylindrical grinding machine; meanwhile, an up-down moving mechanism is additionally arranged on a grinding wheel spindle box of the numerical control cylindrical grinding machine, and a side bus dial indicator for correcting a side bus of the slender shaft is arranged on a moving arm of the up-down moving mechanism. The invention improves the grinding processing precision of the slender shaft parts.
Description
Technical Field
The invention relates to the technical field of slender shaft processing, in particular to a high-precision grinding process and application of a slender shaft.
Background
Along with the development of the mechanical industry, the popularization of the intelligent technology and the increasing popularization of numerical control machines, the annual demand of slender shaft parts such as ball screws, precise slender screws, polished rods and the like increases year by year. The slender shaft type part is easy to deform during processing due to the large length-diameter ratio, particularly when the length-diameter ratio of the slender shaft is larger than 50, the processing difficulty is greatly improved, the processing efficiency is greatly reduced, and the processing precision is difficult to guarantee. Therefore, it has been a problem for those skilled in the art to solve the problems of high quality processing and high efficiency processing of the elongated shaft.
In the prior art, two traditional processes for grinding the excircle of a slender shaft are as follows:
the first traditional process comprises the following steps: and (3) grinding the excircle, adjusting radial run-out through the center frame supporting clamp, and grinding the excircle by generally controlling the radial run-out within 0.005 mm. Because the slender shaft rotates with a constant centrifugal force, a new rotation center is formed, the radial run-out cannot reflect a correct value, and the irregular center line of the slender shaft is not concentric with and collinear with the center line formed by the center holes at the two ends. Therefore, the accuracy effect of the excircle is different every grinding, the shaft is arranged on a qualified standard and has run-out and over-tolerance, and if the shaft is a gearbox or a speed reducer, gear meshing transmission is unstable, and the meshing contact accuracy, vibration and noise are over-tolerance. For the involute spline broaching tool, the cutting edges are distributed at irregular positions after the excircle and the spline are ground, the center line of the broaching tool is changed from bending to straightening due to the action of broaching force during broaching, and the cutting edge is not positioned on the section of the center line at the regular position, so that the tooth form of the spline after the part is broached shows the phenomenon of east-down-west skew in a detection report.
Particularly, when the tooth form of the spline broach shaft with the length-diameter ratio of more than 50 is ground, the spline broach shaft is arranged between the tops of the spline grinding machine, the requirement that the coaxiality of all the sections of the broach is less than 0.003mm and the radial runout is less than 0.003mm is difficult to adjust by using a conventional center frame supporting method during installation, the large coaxiality error can cause large position error of the ground spline tooth form, when the spline broach shaft is used for spline broaching, the spline broach shaft corrects the different axial degrees of the original spline broach shaft during grinding under the powerful deviation rectifying action of axial broaching force, but irregularly distributed spline broach tooth forms are formed, irregular inner spline hole tooth forms are broached, and the tooth form line of the inner spline hole is in irregular change of east-west skew on a detection report. The broach can be tested in a manufacturing plant, but the broaching of the spline hole is unqualified in the gear manufacturing plant, and the quality of the broach and the quality of the spline hole of a part are seriously influenced by the processing error.
The second traditional process comprises the following steps: the excircle is ground directly without a center frame supporting clamp, so that a new shape error is formed, the regular arrangement of the cutting edges of the broach is damaged by the new shape error, and the subsequent machining precision is poor due to excircle reference out-of-round. .
In addition, when processing ball screw, accurate slender screw, polished rod and other slender shaft parts, the technical problem of poor coaxiality caused by difficulty in adjusting slender shaft can also occur.
Disclosure of Invention
In order to solve the problems, the invention provides a high-precision grinding process for a slender shaft and application thereof, aiming at improving the grinding machining precision of slender shaft parts. The specific technical scheme is as follows:
a high-precision grinding process for a slender shaft comprises the following process steps:
(1) equipment modification: the numerical control cylindrical grinding machine is used as equipment for grinding the outer circle of the slender shaft, and an upper bus dial indicator for correcting a bus on the slender shaft is arranged on a grinding wheel spindle box of the numerical control cylindrical grinding machine; meanwhile, an up-down moving mechanism is additionally arranged on a grinding wheel spindle box of the numerical control cylindrical grinding machine, and a side bus dial indicator for correcting a side bus of the slender shaft is arranged on a moving arm of the up-down moving mechanism;
(2) prefabricating a reference ring: a reference ring matched with the outer circle of one end part of the slender shaft is manufactured in advance and used as a correction tool for grinding the slender shaft, and the fit between the inner hole of the reference ring and the outer circle of the end part of the slender shaft is interference fit;
(3) installing a reference ring: installing a reference ring at one end of the slender shaft;
(4) clamping and positioning a slender shaft: clamping a slender shaft provided with a reference ring on a numerical control cylindrical grinding machine, positioning center holes at two ends of the slender shaft in two thimbles of the numerical control cylindrical grinding machine, and presetting N center frames in the middle;
(5) setting the slender shaft correction position: setting N correction positions on the slender shaft; the center frame is arranged at each correction position;
(6) correcting position size measurement: respectively measuring the diameters of the outer circles of the slender shaft at N correction positions, and recording;
(7) grinding the excircle of the reference ring: respectively grinding N grades of excircle sizes on the excircle of the reference ring, wherein the N grades of excircle sizes are the same as the excircle diameters of N correction positions on the slender shaft;
(8) correcting an upper bus and a side bus: respectively correcting an upper bus and a side bus of the slender shaft at N correction positions by a comparative measurement method by taking the N-gear excircle of the reference ring as a reference, and correspondingly enabling the excircle of the N correction positions on the slender shaft to be coaxial with the N-gear excircle of the reference ring by adjusting the position of the center frame; when the upper bus is corrected, respectively aligning the highest point of the position on the excircle of the reference ring and the highest point of the position on the excircle of the corresponding correction position of the slender shaft by using an upper bus dial indicator to compare the readings of the dial indicator; when the side bus is corrected, the side bus dial indicator is used for respectively aligning the highest point of the lateral position of the excircle of the reference ring and the highest point of the lateral position of the excircle of the corresponding correction position of the slender shaft to compare the readings of the dial indicator;
(9) grinding the excircle of the slender shaft: and after the correction of each correction position is finished, grinding the excircle of the slender shaft.
And when the side bus is corrected, the Z-axis movement of a grinding wheel spindle box of the numerical control cylindrical grinding machine is locked.
And the Z-axis moving direction of the grinding wheel spindle box is horizontal and vertical to the slender shaft.
In the technical scheme, the slender shaft is provided with the reference ring, and the grinding wheel spindle box of the grinding machine is provided with the up-down moving mechanism and the side bus dial indicator, so that the slender shaft is arranged at the same height of the excircle side bus of each center frame correction excircle and the excircle side bus of the reference ring corresponding to the same size in the horizontal direction; the equal-height arrangement of the upper bus of the slender shaft at the correction excircle of each center frame and the upper bus of the corresponding excircle with the same size on the reference ring is realized through the upper bus dial indicator, so that the extremely high coaxiality is obtained at the excircle position of each center frame of the slender shaft.
Preferably, N is 3. (preferably, uniform distribution, with specific segments tailored by the craftsman to the specific structure of the elongated shaft.)
The slender shaft ground by the process has the advantages that the slender shaft distortion phenomenon caused by a conventional center frame supporting method is eliminated when the slender shaft is clamped, the slender shaft ground by the process possibly has certain run-out when being detected by a deflection instrument in a free state without support, but the run-out error is greatly reduced compared with the slender shaft ground by the conventional process, and in an actual installation and use state, because the coaxiality of all supporting points of the slender shaft is higher, a very good use effect can be obtained.
Preferably, when the size of the excircle of the grinding reference ring has an error relative to the size of the excircle at the corresponding correction position on the slender shaft, error compensation is performed to ensure that the excircle at the corresponding correction position of the slender shaft is coaxial with the reference ring.
For example, when the size of the outer circle of the reference ring is 0.01mm larger than the actual size of the outer circle at the corresponding correction position on the slender shaft, which is equivalent to that the single edge (in the radial direction) of the outer circle of the reference ring is 0.005mm higher, the error of 0.005mm should be taken into account when the table is drawn and the position of the center frame is corrected to realize the error compensation.
Preferably, the reference ring is provided with a set screw for secure fixation of the reference ring on the elongate shaft.
Preferably, the difference of the readings of the upper generatrix dial indicator at the calibration position of the datum ring and the corresponding slender shaft is not more than 0.003mm when the upper generatrix is calibrated, the difference of the readings of the side generatrix dial indicator at the calibration position of the datum ring and the corresponding slender shaft is not more than 0.003mm when the side generatrix is calibrated, and the radial circular runout value at the calibration position of the slender shaft is not more than 0.003 mm.
Preferably, the center holes at the two ends of the slender shaft are ground by a center hole grinding machine, the concentric lines and the circles are the same, the angle of the center hole is 60 degrees, the upper deviation of the angle of the center hole is 0, the lower deviation is-15', and the surface roughness of the center hole is less than Ra0.8.
In the process of grinding the excircle of the reference ring, a meter-striking detection method and a turn-around meter-striking detection method are adopted to respectively detect the runout of the reference ring and compare the runout, so that the consistency of the runout of an upper bus and a side bus of the reference ring along the bus before turning and after turning and clamping is less than 0.002mm, and the radial circular runout is less than 0.002 mm.
The application of the high-precision grinding process of the slender shaft comprises the steps that the grinding process is applied to grinding of the outer circle of a spline broach shaft, a spline grinding machine is adopted to grind the tooth form of the spline broach shaft after the outer circle of the spline broach shaft is ground, and before the tooth form of the spline broach shaft is ground, the reference ring and the center frame are used for correcting the upper bus, the side bus and the radial circular runout of the tooth form outer circle in advance so as to ensure that the N-gear tooth form outer circle on the spline broach shaft is coaxial and the same in size with the N-gear outer circle on the reference ring correspondingly.
Preferably, when the tooth form of the involute spline broach is ground, the supporting point of the central frame is generally arranged on a leading excircle of the broach and a specially ground roundness and radial circular run-out precision in a chip groove and other coaxial supporting circles.
In the invention, the up-down moving mechanism comprises a base fixedly connected with the grinding wheel spindle box and a moving arm which is arranged on the base and can move up and down, and the side bus dial indicator is fixed on the moving arm.
The invention has the beneficial effects that:
firstly, the slender shaft high-precision grinding process and the application thereof realize the equal height arrangement of the slender shaft in the horizontal direction between the excircle side bus of each center frame correction excircle and the excircle side bus of the same size corresponding to the datum ring on the datum ring by arranging the datum ring on the slender shaft and arranging the up-down moving mechanism and the side bus dial indicator on the grinding wheel spindle box of the grinding machine; the equal-height arrangement of the upper bus of the slender shaft at the correction excircle of each center frame and the upper bus of the corresponding excircle with the same size on the reference ring is realized through the upper bus dial indicator, so that the extremely high coaxiality is obtained at the excircle position of each center frame of the slender shaft.
Secondly, the slender shaft grinding process and the application thereof eliminate the slender shaft distortion phenomenon caused by the conventional center frame supporting method when the slender shaft is clamped, the slender shaft ground by the process can still have certain run-out when being detected by a deflection instrument in an unsupported free state, but the run-out error is greatly reduced compared with that of the slender shaft ground by the conventional process, and a very good use effect can be obtained due to the fact that the coaxiality of all supporting points of the slender shaft is higher in the actual installation and use state.
Drawings
FIG. 1 is a schematic process flow diagram of a high precision grinding process for an elongated shaft according to the present invention;
FIG. 2 is a schematic diagram of a top bus dial indicator and a side bus dial indicator respectively used for correcting the position of a center frame in two directions;
FIG. 3 is a schematic view of the alignment using the reference ring during grinding of the spline broach shaft.
In fig. 2: 1. slender shaft, 2, upper bus dial indicator, 3, side bus dial indicator, 4, up-down moving mechanism, 5, base, 6, moving arm, 7, spring, 8 and central frame.
In fig. 3: A. b, C are the corresponding correction positions on the reference ring and the spline broach shaft respectively; d front handle represents the front end handle excircle of the broaching shaft, d front guide represents the front end guide excircle of the broaching shaft, d back guide represents the back end guide excircle of the broaching shaft, d back handle represents the back end handle excircle of the broaching shaft, d cutting teeth represent the cutting teeth of the broaching shaft, and d correcting teeth represent the correcting teeth of the broaching shaft.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1:
fig. 1 to 3 show an embodiment of a high-precision grinding process and application of an elongated shaft, which comprises the following process steps:
(1) equipment modification: a numerical control cylindrical grinding machine is adopted as equipment for grinding the outer circle of the slender shaft, and an upper bus dial indicator 2 for correcting the upper bus of the slender shaft 1 is arranged on a grinding wheel spindle box of the numerical control cylindrical grinding machine; meanwhile, an up-down moving mechanism 4 is additionally arranged on a grinding wheel spindle box of the numerical control cylindrical grinding machine, and a side bus dial indicator 3 for correcting a side bus of the slender shaft 1 is arranged on a moving arm 6 of the up-down moving mechanism 4;
(2) prefabricating a reference ring: a reference ring matched with the outer circle of one end part of the slender shaft is manufactured in advance and used as a correction tool for grinding the slender shaft, and the fit between the inner hole of the reference ring and the outer circle of the end part of the slender shaft is interference fit;
(3) installing a reference ring: installing a reference ring at one end of the slender shaft;
(4) clamping and positioning a slender shaft: clamping a slender shaft provided with a reference ring on a numerical control cylindrical grinding machine, positioning center holes at two ends of the slender shaft in two thimbles of the numerical control cylindrical grinding machine, and presetting N center frames in the middle;
(5) setting the slender shaft correction position: setting N correction positions on the slender shaft; the center frame is arranged at each correction position;
(6) correcting position size measurement: respectively measuring the diameters of the outer circles of the slender shaft at N correction positions, and recording;
(7) grinding the excircle of the reference ring: respectively grinding N grades of excircle sizes on the excircle of the reference ring, wherein the N grades of excircle sizes are the same as the excircle diameters of N correction positions on the slender shaft;
(8) correcting an upper bus and a side bus: respectively correcting an upper bus and a side bus of the slender shaft at N correction positions by a comparative measurement method by taking the N-gear excircle of the reference ring as a reference, and correspondingly enabling the excircle of the N correction positions on the slender shaft to be coaxial with the N-gear excircle of the reference ring by adjusting the position of the center frame; when the upper bus is corrected, respectively aligning the highest point of the position on the excircle of the reference ring and the highest point of the position on the excircle of the corresponding correction position of the slender shaft by using an upper bus dial indicator to compare the readings of the dial indicator; when the side bus is corrected, the side bus dial indicator is used for respectively aligning the highest point of the lateral position of the excircle of the reference ring and the highest point of the lateral position of the excircle of the corresponding correction position of the slender shaft to compare the readings of the dial indicator;
(9) grinding the excircle of the slender shaft: and after the correction of each correction position is finished, grinding the excircle of the slender shaft.
And when the side bus is corrected, the Z-axis movement of a grinding wheel spindle box of the numerical control cylindrical grinding machine is locked.
And the Z-axis moving direction of the grinding wheel spindle box is horizontal and vertical to the slender shaft.
In the technical scheme, the slender shaft is provided with the reference ring, and the grinding wheel spindle box of the grinding machine is provided with the up-down moving mechanism and the side bus dial indicator, so that the slender shaft is arranged at the same height of the excircle side bus of each center frame correction excircle and the excircle side bus of the reference ring corresponding to the same size in the horizontal direction; the equal-height arrangement of the upper bus of the slender shaft at the correction excircle of each center frame and the upper bus of the corresponding excircle with the same size on the reference ring is realized through the upper bus dial indicator, so that the extremely high coaxiality is obtained at the excircle position of each center frame of the slender shaft.
Preferably, N is 3. (preferably, uniform distribution, with specific segments tailored by the craftsman to the specific structure of the elongated shaft.)
The slender shaft ground by the process has the advantages that the slender shaft twisting phenomenon caused by a conventional center frame supporting method is eliminated when the slender shaft is clamped, the slender shaft ground by the process can possibly jump to a certain extent by using a deflection instrument in a free state without support, but the jumping error is greatly reduced compared with that of the slender shaft ground by the conventional process, and in an actual installation and use state, due to the fact that the coaxiality of each supporting point of the slender shaft is higher, a very good use effect can be obtained.
Preferably, when the size of the excircle of the grinding reference ring has an error relative to the size of the excircle at the corresponding correction position on the slender shaft, error compensation is performed to ensure that the excircle at the corresponding correction position of the slender shaft is coaxial with the reference ring.
For example, when the size of the outer circle of the reference ring is 0.01mm larger than the actual size of the outer circle at the corresponding correction position on the slender shaft, which is equivalent to that the single edge (in the radial direction) of the outer circle of the reference ring is 0.005mm higher, the error of 0.005mm should be taken into account when the table is drawn and the position of the center frame is corrected to realize the error compensation.
Preferably, the reference ring is provided with a set screw for secure fixation of the reference ring on the elongate shaft.
Preferably, the difference of the readings of the upper generatrix dial indicator at the calibration position of the datum ring and the corresponding slender shaft is not more than 0.003mm when the upper generatrix is calibrated, the difference of the readings of the side generatrix dial indicator at the calibration position of the datum ring and the corresponding slender shaft is not more than 0.003mm when the side generatrix is calibrated, and the radial circular runout value at the calibration position of the slender shaft is not more than 0.003 mm.
Preferably, the center holes at the two ends of the slender shaft are ground by a center hole grinding machine, the concentric lines and the circles are the same, the angle of the center hole is 60 degrees, the upper deviation of the angle of the center hole is 0, the lower deviation is-15', and the surface roughness of the center hole is less than Ra0.8.
Considering that the direction of error distribution at two ends is strictly controlled, the primary and sufficient condition of using the reference ring to calibrate the coaxiality is adopted, in the working procedure of grinding the excircle of the reference ring, the meter-striking detection method and the turning meter-striking detection method are adopted to respectively detect and compare the runout of the reference ring, so that the consistency of the runout of the upper bus and the side bus of the reference ring along the buses before turning and after turning and clamping is less than 0.002mm, and the radial circular runout is less than 0.002 mm.
Example 2:
the application of the high-precision grinding process for the slender shaft in embodiment 1 comprises the steps of applying the grinding process to grinding the outer circle of a spline broach shaft, grinding the tooth form of the spline broach shaft by using a spline grinding machine after the outer circle of the spline broach shaft is ground, and correcting the upper bus, the side bus and the radial circular run-out of the tooth form outer circle by using the reference ring and the center frame in advance before grinding the tooth form of the spline broach shaft so as to ensure that the N-gear tooth form outer circle on the spline broach shaft is coaxial and the same size with the N-gear outer circle on the reference ring correspondingly.
Preferably, when the tooth form of the involute spline broach is ground, the supporting point of the central frame is generally arranged on a leading excircle of the broach and a specially ground roundness and radial circular run-out precision in a chip groove and other coaxial supporting circles.
In this embodiment, the up-down moving mechanism includes a base fixedly connected to the grinding wheel spindle box and a moving arm disposed on the base and capable of moving up and down, and the side busbar dial indicator is fixed to the moving arm.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. A high-precision grinding process for a slender shaft is characterized by comprising the following process steps:
(1) equipment modification: the numerical control cylindrical grinding machine is used as equipment for grinding the outer circle of the slender shaft, and an upper bus dial indicator for correcting a bus on the slender shaft is arranged on a grinding wheel spindle box of the numerical control cylindrical grinding machine; meanwhile, an up-down moving mechanism is additionally arranged on a grinding wheel spindle box of the numerical control cylindrical grinding machine, and a side bus dial indicator for correcting a side bus of the slender shaft is arranged on a moving arm of the up-down moving mechanism;
(2) prefabricating a reference ring: a reference ring matched with the outer circle of one end part of the slender shaft is manufactured in advance and used as a correction tool for grinding the slender shaft, and the fit between the inner hole of the reference ring and the outer circle of the end part of the slender shaft is interference fit;
(3) installing a reference ring: installing a reference ring at one end of the slender shaft;
(4) clamping and positioning a slender shaft: clamping a slender shaft provided with a reference ring on a numerical control cylindrical grinding machine, positioning center holes at two ends of the slender shaft in two thimbles of the numerical control cylindrical grinding machine, and presetting N center frames in the middle;
(5) setting the slender shaft correction position: setting N correction positions on the slender shaft; the center frame is arranged at each correction position;
(6) correcting position size measurement: respectively measuring the diameters of the outer circles of the slender shaft at N correction positions, and recording;
(7) grinding the excircle of the reference ring: respectively grinding N grades of excircle sizes on the excircle of the reference ring, wherein the N grades of excircle sizes are the same as the excircle diameters of N correction positions on the slender shaft;
(8) correcting an upper bus and a side bus: respectively correcting an upper bus and a side bus of the slender shaft at N correction positions by a comparative measurement method by taking the N-gear excircle of the reference ring as a reference, and correspondingly enabling the excircle of the N correction positions on the slender shaft to be coaxial with the N-gear excircle of the reference ring by adjusting the position of the center frame; when the upper bus is corrected, respectively aligning the highest point of the position on the excircle of the reference ring and the highest point of the position on the excircle of the corresponding correction position of the slender shaft by using an upper bus dial indicator to compare the readings of the dial indicator; when the side bus is corrected, the side bus dial indicator is used for respectively aligning the highest point of the lateral position of the excircle of the reference ring and the highest point of the lateral position of the excircle of the corresponding correction position of the slender shaft to compare the readings of the dial indicator;
(9) grinding the excircle of the slender shaft: and after the correction of each correction position is finished, grinding the excircle of the slender shaft.
2. A high-precision grinding process for a slender shaft according to claim 1, wherein when a side generatrix is corrected, a Z-axis movement of a grinding wheel spindle box of the numerical control cylindrical grinding machine is locked.
3. The high-precision grinding process for the slender shaft according to claim 1, wherein when the size of the excircle of the grinding reference ring has an error relative to the size of the excircle at the corresponding correction position on the slender shaft, error compensation is performed to ensure that the excircle at the corresponding correction position of the slender shaft is coaxial with the reference ring.
4. A high precision grinding process for an elongated shaft according to claim 1, characterized in that the reference ring is provided with set screws for secure fixation of the reference ring on the elongated shaft.
5. The high-precision grinding process for the slender shaft according to claim 1, wherein the difference of the readings of the micrometer gauge of the upper generatrix thereof at the calibration position of the reference ring and the corresponding slender shaft is not more than 0.003mm when the upper generatrix is calibrated, the difference of the readings of the micrometer gauge of the side generatrix thereof at the calibration position of the reference ring and the corresponding slender shaft is not more than 0.003mm when the side generatrix is calibrated, and the radial circular runout value at the calibration position of the slender shaft is not more than 0.003 mm.
6. A high-precision grinding process for a slender shaft according to claim 1, characterized in that the central holes at both ends of the slender shaft are ground by a central hole grinder, the concentric collinear and collinear center holes are 60 degrees, the upper deviation of the angle of the central hole is 0, the lower deviation is-15', and the surface roughness of the central hole is Ra0.8 or less.
7. The high-precision grinding process of the slender shaft according to claim 1, characterized in that in the working procedure of grinding the excircle of the reference ring, a meter-striking detection method and a turn-around meter-striking detection method are adopted to respectively detect the runout of the reference ring and compare the runout, the consistency of the runout of the upper bus and the side bus of the reference ring along the buses before turning and after turning and clamping is less than 0.002mm, and the radial circular runout is less than 0.002 mm.
8. The application of the high-precision grinding process of the slender shaft according to any one of claims 1 to 7 is characterized by comprising the steps of applying the grinding process to grinding the outer circle of the spline broach shaft, grinding the tooth form of the spline broach shaft by using a spline grinding machine after the outer circle of the spline broach shaft is ground, and correcting an upper bus, a side bus and radial circular run-out of the tooth form outer circle in advance by using the reference ring and the center frame before grinding the tooth form of the spline broach shaft so as to ensure that the outer circle of the N-gear tooth form on the spline broach shaft is coaxial and the same size with the outer circle of the N-gear on the reference ring correspondingly.
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| CN113910021B (en) * | 2021-10-27 | 2024-02-23 | 上海铼钠克数控科技有限公司 | Special-shaped excircle grinding method and system |
| CN114346603A (en) * | 2021-12-29 | 2022-04-15 | 中国原子能科学研究院 | Machining process method suitable for slender rod piece of iron-horse steel |
| CN115609247B (en) * | 2022-12-16 | 2023-05-30 | 山西航天清华装备有限责任公司 | Thickness processing method for corrugated thin-wall axial V-shaped groove |
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