A high-precision gear hobbing machine tool holder and its multi-pass shaft hole rework machining method

Abstract

This application provides a high-precision gear hobbing machine tool holder and a machining method for multi-pass shaft hole rework, relating to the field of shaft hole machining. The high-precision gear hobbing machine tool holder includes a tool holder base, with two support seats mounted on one side of the tool holder base. A tool holder cover is provided at the end of the tool holder base, and two copper sleeves are installed inside the tool holder cover. The tool shank shaft is sequentially passed through and rotatably mounted on the two copper sleeves and the two support seats. A worm gear transmission system for driving the tool shank shaft to rotate and cut is provided inside the tool holder cover. This application can minimize the large shape errors and dimensional deviations that exist after shaft hole machining.

Description

Technical Field

[0001] This application relates to the field of shaft hole machining technology, and in particular to a high-precision gear hobbing machine tool holder and a machining method for multiple shaft hole rework. Background Technology

[0002] In the field of mechanical manufacturing, shaft and hole machining is a crucial fundamental process. As modern industry rapidly develops towards higher precision and performance, increasingly stringent requirements are being placed on the machining accuracy and quality of shafts and holes.

[0003] In numerous industrial applications, such as core components in aviation and aerospace, the spindle and bearing mating parts of precision machine tools, and the gear shaft holes in automotive transmissions, the precision of shaft holes directly affects the operational stability, reliability, and service life of the entire mechanical system. Traditional shaft hole machining methods often reveal many shortcomings when faced with the need to machine multiple shaft holes. On the one hand, conventional processes struggle to effectively control the dimensional and shape accuracy after machining multiple holes. On the other hand, workpiece deformation caused by cutting forces and heat during machining makes it difficult to improve machining accuracy. Traditional processes cannot accurately monitor and compensate for these problems in real time, resulting in significant shape and dimensional errors in the machined shaft holes, failing to meet the high-precision shaft hole requirements of today's high-end manufacturing industry. Summary of the Invention

[0004] In order to overcome the technical problems described in the prior art, this application provides a high-precision gear hobbing machine tool holder and a machining method for reworking multiple shaft holes.

[0005] Firstly, this application provides a high-precision gear hobbing machine tool holder, which adopts the following technical solution:

[0006] A high-precision gear hobbing machine tool holder includes a tool holder base, two support seats are mounted on one side of the tool holder base, a tool holder cover is provided at the end of the tool holder base, two copper sleeves are provided inside the tool holder cover, a tool bar shaft is sequentially passed through and rotatably mounted on the two copper sleeves and the two support seats, and a worm gear transmission system for driving the tool bar shaft to rotate and cut is provided inside the tool holder cover.

[0007] Furthermore, the tool holder seat has T-slots on both sides of the support seat, and mounting parts for stably installing the support seat on the tool holder seat are provided in the T-slots.

[0008] Secondly, this application provides a machining method for reworking multiple shaft holes on a high-precision gear hobbing machine tool holder, based on the aforementioned high-precision gear hobbing machine tool holder, comprising the following steps.

[0009] S1, Compatibility analysis: Select the appropriate rework tool based on the machining accuracy requirements of the shaft hole and the material of the workpiece.

[0010] S2, Precision calibration and optimization of equipment: Based on the characteristics of shaft hole machining, the control system parameters of the equipment are precisely calibrated and optimized in all aspects.

[0011] S3, Reference Check: The surface of the tool holder away from the support is reference surface A, and the surface of the tool holder T-slot used to support the mounting support is reference surface A1. Check the flatness and parallelism of reference surfaces A and A1, the perpendicularity of the worm gear mounting hole axis to reference surface A1, and the coaxiality of the shaft holes on the two copper sleeves inside the tool holder cover and the shaft holes on the two support seats.

[0012] S4. Establish a new reference. Based on the data detected in step S3, machine the A reference surface, A1 reference surface, and the side of the T-slot using a milling machine.

[0013] S5, shaft hole rework: move the support seat to the side close to the tool holder cover and fix it. Then, use a boring machine to simultaneously process the shaft holes on the two copper sleeves inside the tool holder cover and the shaft holes on the two support seats.

[0014] S6, Geometric accuracy inspection: Check whether the geometric accuracy of the A datum plane, A1 datum plane, the shaft holes on the two copper sleeves inside the tool holder cover and the shaft holes on the two support seats meets the requirements. If they do not meet the requirements, continue to repeat step S5 until they meet the requirements.

[0015] Furthermore, the comprehensive precision calibration performed in step S2 includes the spindle accuracy, coordinate axis positioning accuracy, and motion repeatability of the machining equipment.

[0016] Furthermore, the targeted optimizations in step S2 include adjusting the gain of the servo motor and optimizing the interpolation algorithm.

[0017] Furthermore, the machining steps for datum plane A and datum plane A1 in step S4 are as follows:

[0018] S41, Place the A datum surface downwards and stably place it on the milling machine using shims. Operate the milling machine to machine the A1 datum surface to ensure that the flatness of the A1 datum surface meets the design requirements.

[0019] S42, using the currently measured axis of the worm gear mounting hole as a reference standard, fine-tune the shims so that the perpendicularity between the adjusted A1 reference plane and the previously measured axis of the worm gear mounting hole meets the design requirements;

[0020] S43, re-mill the A datum surface, A1 datum surface and the side of the T-slot to ensure that the flatness of the A datum surface and A1 datum surface meets the design requirements, the parallelism between the A datum surface and A1 datum surface meets the design requirements, and the perpendicularity between the side of the T-slot and the A1 datum surface meets the design requirements.

[0021] Furthermore, the flatness of the A1 datum plane in step S41, the flatness of the A1 datum plane in step S43, and the flatness of the A datum plane are all 0.01 mm.

[0022] Furthermore, in step S42, four shims are provided, each used to support one of the four corners of the tool holder. One end of each shim is detachably connected to the tool holder, and the other end is detachably connected to the machining equipment. The height of the shims is adjustable.

[0023] Furthermore, in the worm gear transmission system, there are two worms, which are respectively meshed on both sides of the worm wheel on the tool holder shaft. The two worms rotate in opposite directions. In step S42, the perpendicularity between the A1 reference plane and the previously measured worm mounting hole axis reference standard is 0.01 mm, and the perpendicularity between the A1 reference plane and the previously measured worm mounting hole axis reference standard is within 0.03 mm.

[0024] Furthermore, in step S43, the parallelism accuracy between the A reference plane and the A1 reference plane is 0.01 mm, and the perpendicularity between the side of the T-slot and the A1 reference plane is 0.01 mm.

[0025] In summary, this application includes the following beneficial technical effects:

[0026] This application uses real-time monitoring and compensation to eliminate large shape errors and dimensional deviations after shaft hole machining as much as possible, which can meet the current demand for high-precision shaft holes in high-end manufacturing industries. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a front view of a high-precision gear hobbing machine tool holder according to an embodiment of this application.

[0029] Figure 2 This is a side view of a high-precision gear hobbing machine tool holder according to an embodiment of this application.

[0030] Figure 3 This is a schematic diagram of the tool holder for a high-precision boring machine in the embodiment of this application.

[0031] Reference numerals in the attached drawings: 1. Tool holder; 2. Support base; 3. Groove; 4. Tool holder cover; 5. T-slot; 6. Shim; 7. A reference plane; 8. A1 reference plane; 9. High-precision boring machine. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0033] This application discloses a high-precision gear hobbing machine tool holder and a machining method for reworking multiple shaft holes. (Refer to...) Figure 1 , Figure 2 and Figure 3 A high-precision gear hobbing machine tool holder includes a tool holder base 1. Two support seats 2 are mounted on one side of the tool holder base 1, and two T-slots 5 are also formed on this side. The two T-slots 5 are located on both sides of the support seats 2, and the length direction of the T-slots 5 is consistent with the length direction of the tool holder base 1. A groove 3 is provided on the tool holder base 1 between the two T-slots 5. The support seat 2 includes a main body structure located in the groove 3 and ear plates protruding from both sides of the main body structure. The two ear plates are respectively placed on the two T-slots 5, so that the position of the support seat 2 can be adjusted along the length direction of the tool holder base 1. A mounting component for stably installing the support seat 2 on the tool holder base 1 is provided in the T-slot 5. The mounting component includes a polygonal nut located in the T-slot 5 and a bolt passing through the ear plate and threaded to the nut. By tightening the bolt, the support seat 2 can be stably installed on the tool holder base 1. A through hole is provided on the support base 2. A tool holder cover 4 is provided at the end of the tool holder base 1. Copper sleeves are provided on both sides of the tool holder cover 4. The tool bar shaft is sequentially inserted and rotatably mounted in the through holes on the two copper sleeves and the two support bases 2 through bearings. A worm gear transmission system for driving the tool bar shaft to rotate and cut is provided inside the tool holder cover 4. In this embodiment, the worm gear transmission system adopts double worm gear transmission technology, which effectively solves the backlash problem of traditional single worm gear transmission. A worm wheel is fixedly sleeved on the tool bar shaft. The worm wheel is located between the two copper sleeves. Both worms are rotatably mounted on the tool holder cover 4 and symmetrically mesh with the two sides of the worm wheel on the tool bar shaft. The rotation directions of the two worms are opposite.

[0034] As the tool holder shaft rotates and cuts for a long time, the two support seats 2 used to rotate and mount the tool holder shaft and the copper sleeve on the tool holder cover 4 are prone to wear, which affects the subsequent machining accuracy. Therefore, it is necessary to repair the shaft hole of the tool holder seat 1.

[0035] Reference Figure 1 , Figure 2 and Figure 3 A machining method for reworking multiple shaft holes on a high-precision gear hobbing machine tool holder includes the following steps:

[0036] S1, Compatibility Analysis: Based on the machining length, machining allowance and accuracy requirements of the shaft hole, conduct an in-depth analysis of the machining characteristics of the material of the part to be machined, and determine the material, geometry and coating type of the rework tool that matches it.

[0037] S2, Precision calibration and optimization of equipment, including the use of high-precision testing instruments such as laser interferometers and ballbars to perform comprehensive precision calibration of the spindle accuracy, coordinate axis positioning accuracy, and motion repeatability of the processing equipment; at the same time, based on the characteristics of shaft and hole machining, the control system parameters of the equipment are specifically optimized, including adjusting the gain of the servo motor and optimizing the interpolation algorithm, to achieve high-precision motion control of the equipment during the processing.

[0038] S3, reference check: The surface of the tool holder 1 away from the support seat 2 is reference surface A 7, and the surface of the tool holder 1 T-slot 5 used to support and install the support seat 2 is reference surface A1 8. Place the tool holder 1 on a coordinate measuring machine for inspection, check the flatness and parallelism of reference surface A 7 and reference surface A1 8, the perpendicularity of the axis of the two worm gear mounting holes to reference surface A1 8, and the coaxiality of the shaft holes on the two copper sleeves inside the tool holder cover 4 and the shaft holes on the two support seats 2.

[0039] S4. Establish a new reference. Combine the data detected in step S3 and place the detected tool holder 1 on the high-precision gantry milling machine to process the A reference surface 7, A1 reference surface 8, and the side of the T-slot 5.

[0040] S41. During machining, first place the A reference surface 7 downwards, and detachably install height-adjustable pads 6 at the four corners of the tool holder 1 so that the four pads 6 can stably support the tool holder 1 on the high-precision gantry milling machine. Then, operate the high-precision gantry milling machine to machine the A1 reference surface 8 to ensure that the flatness of the A1 reference surface 8 reaches 0.01 mm.

[0041] S42, using the currently measured axes of the two worm gear mounting holes as reference standards, fine-tune the height of the four shims 6 to adjust the tilt angle of the tool holder 1 on the high-precision gantry milling machine, so that the perpendicularity between the A1 reference surface 8 on the adjusted tool holder 1 and the previously measured axis of one worm gear mounting hole reference standard is 0.01 mm, and the perpendicularity between the A1 reference surface 8 and the previously measured axis of another worm gear mounting hole reference standard is within 0.03 mm;

[0042] S43, re-mill the sides of A datum surface 7, A1 datum surface 8 and T-slot 5 to ensure that the flatness of A datum surface 7 and A1 datum surface 8 is 0.01 mm, the parallelism between A datum surface 7 and A1 datum surface 8 is 0.01 mm, and the perpendicularity between the side of T-slot 5 and A1 datum surface 8 is 0.01 mm.

[0043] S5, shaft hole rework: Place the tool holder 1 as a whole on the high-precision boring machine 9, and clamp, align and tighten it according to the test data recorded by the high-precision gantry milling machine. Move both support seats 2 to the side close to the tool holder cover 4 and tighten the bolts to fix them. Using the center of the inner hole of the copper sleeve on the tool holder cover 4 as the reference, use the high-precision boring machine 9 to simultaneously perform semi-finish boring processing on the shaft holes on the two copper sleeves on the tool holder cover 4 and the shaft holes on the two support seats 2 with a single-sided allowance of 0.5 mm for the inner hole.

[0044] S6, Geometric accuracy detection: Keeping the clamping state unchanged, move the support 2 to the side away from the tool holder cover 4, and record the geometric accuracy data of the semi-finish boring shaft hole using a coordinate measuring machine. The detection data includes the boring bar elongation deflection error, the contact error between the support 2 and the A1 datum surface 8, the deformation error of the inner hole after cutting, and the systematic error between the machine tool cutting CNC system and the coordinate measuring machine measurement system. The tool holder 1 is then mounted on the high-precision boring machine 9, with the clamping posture consistent with the semi-finish boring. The machining is compensated according to the detection data to eliminate the above-mentioned errors, and the precision boring is performed to the target diameter. Finally, after the precision boring is completed, the geometric accuracy of the shaft holes on the two copper sleeves inside the tool holder cover 4 and the shaft holes on the two support 2 is re-measured using a coordinate measuring machine. The geometric accuracy of the A datum surface 7 and the A1 datum surface 8 is also checked. The qualified data measured by the coordinate measuring machine will be used as the basis for the qualified shaft hole inspection.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-precision gear hobbing machine tool rest multi-pass shaft hole repair machining method, characterized in that, Includes the following steps, S1, Compatibility analysis: Select the appropriate rework tool based on the machining accuracy requirements of the shaft hole and the material of the workpiece. S2, Precision calibration and optimization of equipment: Based on the characteristics of shaft hole machining, the control system parameters of the equipment are precisely calibrated and optimized in all aspects. S3, Reference Check: The surface of the tool holder away from the support is reference surface A, and the surface of the tool holder T-slot used to support the mounting support is reference surface A1. Check the flatness and parallelism of reference surfaces A and A1, the perpendicularity of the worm gear mounting hole axis to reference surface A1, and the coaxiality of the shaft holes on the two copper sleeves inside the tool holder cover and the shaft holes on the two support seats. S4. Establish a new reference. Based on the data detected in step S3, machine the A reference surface, A1 reference surface, and the side of the T-slot using a milling machine. S5, shaft hole rework: move the support seat to the side close to the tool holder cover and fix it. Then, use a boring machine to simultaneously process the shaft holes on the two copper sleeves inside the tool holder cover and the shaft holes on the two support seats. S6, Geometric accuracy inspection: Check whether the geometric accuracy of the A datum plane, A1 datum plane, the shaft holes on the two copper sleeves inside the tool holder cover and the shaft holes on the two support seats meets the requirements. If they do not meet the requirements, continue to repeat step S5 until they meet the requirements.

2. The machining method of claim 1, wherein, The comprehensive precision calibration performed in step S2 includes the spindle accuracy, coordinate axis positioning accuracy, and motion repeatability of the machining equipment.

3. The machining method of claim 1, wherein, The targeted optimizations in step S2 include adjusting the gain of the servo motor and optimizing the interpolation algorithm.

4. The machining method of claim 1, wherein, The machining steps for datum plane A and datum plane A1 in step S4 are as follows: S41, Place the A datum surface downwards and stably place it on the milling machine using shims. Operate the milling machine to machine the A1 datum surface to ensure that the flatness of the A1 datum surface meets the design requirements. S42, using the currently measured axis of the worm gear mounting hole as a reference standard, fine-tune the shims so that the perpendicularity between the adjusted A1 reference plane and the previously measured axis of the worm gear mounting hole meets the design requirements; S43, re-mill the A datum surface, A1 datum surface and the side of the T-slot to ensure that the flatness of the A datum surface and A1 datum surface meets the design requirements, the parallelism between the A datum surface and A1 datum surface meets the design requirements, and the perpendicularity between the side of the T-slot and the A1 datum surface meets the design requirements.

5. The machining method of claim 4, wherein, In step S41, the flatness of datum plane A1, and in step S43, the flatness of datum plane A and datum plane A are all 0.01 mm.

6. The machining method of claim 4, wherein, In step S42, four shims are provided, which are used to support the four corners of the tool holder. One end of the shim is detachably connected to the tool holder and the other end is detachably connected to the processing equipment. The height of the shim is adjustable.

7. The machining method for reworking multiple shaft holes on a high-precision gear hobbing machine tool holder according to claim 4, characterized in that, In the worm gear transmission system, there are two worms, which are respectively meshed on both sides of the worm wheel on the tool holder shaft. The two worms rotate in opposite directions. In step S42, the perpendicularity between the A1 reference plane and the previously measured reference standard of the axis of one worm mounting hole is 0.01 mm, and the perpendicularity between the A1 reference plane and the previously measured reference standard of the axis of another worm mounting hole is within 0.03 mm.

8. The machining method of claim 4, wherein, In step S43, the parallelism accuracy between datum plane A and datum plane A1 is 0.01 mm, and the perpendicularity between the side of the T-slot and datum plane A1 is 0.01 mm.

9. A high-precision hobbing machine tool holder made by a machining method of multi-pass axial hole rework of the high-precision hobbing machine tool holder of claim 1, characterized in that, The tool holder includes a tool post base, on one side of which two support seats are mounted. A tool post cover is provided at the end of the tool post base, and two copper sleeves are provided inside the tool post cover. The tool bar shaft is sequentially passed through and rotatably mounted on the two copper sleeves and the two support seats. A worm gear transmission system for driving the tool bar shaft to rotate and cut is provided inside the tool post cover.

10. A high precision gear hobbing machine tool holder according to claim 9, characterized in that, The tool holder has T-slots on both sides of the support base, and mounting parts for stably installing the support base on the tool holder are provided in the T-slots.

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