A tool holder shaft support structure for an internal gear cutter

Abstract

This utility model relates to a support structure for the mounting shaft of an internal milling cutter holder, including a tool fixing part, a first fixing member, a double-row cylindrical roller bearing, a second fixing member, and a double-row angular contact ball bearing. The tool fixing part is located in the middle of the mounting shaft. The first fixing member is fixed to the internal milling cutter holder and movably sleeved on one end of the mounting shaft. The double-row cylindrical roller bearing is located on one side of the tool fixing part. The second fixing member is fixed to the internal milling cutter holder and movably sleeved on the other end of the mounting shaft. The second fixing member and the first fixing member are symmetrically arranged with respect to the tool fixing part. The double-row angular contact ball bearing is located on the other side of the tool fixing part. The double-row angular contact ball bearing and the double-row cylindrical roller bearing are symmetrically arranged with respect to the tool fixing part. This utility model uses double-row angular contact ball bearing support and double-row cylindrical roller bearing support to ensure smooth operation of the mounting shaft during operation, ensuring high-speed operation of the mounting shaft and high precision machining of the gear ring.

Description

Technical Field

[0001] This utility model relates to the field of machine tool technology, specifically to a tool mounting shaft support structure for an internal milling tooth holder. Background Technology

[0002] With the rapid development of the machine tool industry, there are higher requirements for the precision and stability of machine tools. As an important processing equipment for gears and worm gears, the precision and stability of the gear hobbing machine directly determine whether the parts meet the requirements, and also affect the precision of other machine tools. Among them, the internal milling cutter holder is an important component of the gear hobbing machine that directly participates in the processing. The tool mounting shaft is rotatably connected to the internal milling cutter holder, and the milling cutter head is fixed on the tool mounting shaft. The tool mounting shaft is driven by a drive component to move and thus drive the milling cutter head to perform gear ring processing.

[0003] Currently, in heavy-duty intermittent cutting processes, the tool-mounting shaft is usually supported by a double-row tapered roller bearing on one side and a double-row cylindrical roller bearing on the other side. However, this cannot ensure high-speed operation of the tool-mounting shaft, which can easily lead to instability during operation and make it difficult to ensure high precision in gear ring machining. Utility Model Content

[0004] Based on the above description, this utility model provides a support structure for the tool mounting shaft of an internal milling gear holder. One side of the tool mounting shaft is supported by a double-row angular contact ball bearing, and the other side is supported by a double-row cylindrical roller bearing, which makes the tool mounting shaft run smoothly during operation and ensures high-speed operation of the tool mounting shaft and high precision of gear ring machining.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0006] An internal milling cutter holder tool mounting shaft support structure, installed inside the internal milling cutter holder for supporting the tool mounting shaft, includes:

[0007] A tool fixing part is provided in the middle of the tool mounting shaft and is used to fix the tool;

[0008] The first fixing member is fixed to the internal milling cutter holder and movably sleeved on one end of the tool mounting shaft;

[0009] A double-row cylindrical roller bearing is provided on one side of the tool fixing part. The inner ring of the double-row cylindrical roller bearing is fixedly sleeved on the outside of the tool mounting shaft, and the outer ring of the double-row cylindrical roller bearing is fixed to the first fixing member.

[0010] The second fixing member is fixed to the internal milling cutter holder and movably sleeved on the other end of the tool mounting shaft. The second fixing member and the first fixing member are symmetrically arranged with respect to the tool fixing part.

[0011] A double-row angular contact ball bearing is provided on the other side of the tool fixing part. The inner ring of the double-row angular contact ball bearing is fixedly sleeved on the outside of the tool mounting shaft, and the outer ring of the double-row angular contact ball bearing is fixed to the second fixing member. The double-row angular contact ball bearing and the double-row cylindrical roller bearing are symmetrically arranged with respect to the tool fixing part.

[0012] Furthermore, it also includes a first gear and a second gear;

[0013] The first gear is disposed on one side of the tool fixing part, and a portion of the first gear is fixedly sleeved on the outside of the tool mounting shaft and the other portion is movably sleeved on the outside of the first fixing member.

[0014] The second gear is disposed on the other side of the tool fixing part. Part of the second gear is fixedly sleeved on the outside of the tool mounting shaft and the other part is movably sleeved on the outside of the second fixing member. The first gear and the second gear are symmetrically arranged with respect to the tool fixing part.

[0015] Furthermore, it also includes a first sleeve, a second sleeve, and a first flange. The first sleeve is fixedly sleeved on the outside of the tool mounting shaft and disposed on one side of the tool fixing part. The first gear includes a first bushing and a first tooth. The first bushing is fixedly sleeved on one end of the first sleeve near the tool fixing part. The first tooth is disposed on the first bushing and extends along the axial direction of the tool mounting shaft. The first tooth is movably sleeved on the outside of the first fixing member. The second sleeve is sleeved on the outside of the tool mounting shaft and fixed on the other end of the first sleeve away from the tool fixing part. The first flange is disposed between the second sleeve and the first fixing member. The first flange and the first fixing member are fixed. The inner ring of the double-row cylindrical roller bearing is fixedly sleeved on the outside of the first sleeve. One end of the double-row cylindrical roller bearing abuts against the first bushing, and the other end abuts against the first flange and the second sleeve.

[0016] Furthermore, it also includes a third sleeve, a fourth sleeve, and a second flange. The third sleeve is fixedly sleeved on the outside of the tool mounting shaft and disposed on the other side of the tool fixing part. The second gear includes a second bushing and a second tooth. The second bushing is fixedly sleeved on one end of the third sleeve near the tool fixing part. The second tooth is disposed on the second bushing and extends along the axial direction of the tool mounting shaft. The second tooth is movably sleeved on the outside of the second fixing member. The fourth sleeve is sleeved on the outside of the tool mounting shaft and fixed on the other end of the third sleeve away from the tool fixing part. The second flange is disposed between the fourth sleeve and the second fixing member. The second flange and the second fixing member are fixed. The inner ring of the double-row angular contact ball bearing is fixedly sleeved on the outside of the third sleeve. One end of the double-row angular contact ball bearing abuts against the first bushing, and the other end abuts against the second flange and the fourth sleeve.

[0017] Furthermore, a first annular opening groove is provided on the first flange, and the first annular opening groove surrounds the second sleeve;

[0018] There is a first annular gap between the outer side of the first tooth and the internal milling cutter holder;

[0019] The second flange is provided with a second annular opening groove, which surrounds the fourth sleeve;

[0020] There is a second annular gap between the outer side of the second tooth and the internal milling cutter holder;

[0021] The first annular opening groove, the first annular gap, the second annular opening groove, and the second annular gap are all equipped with sealing elements.

[0022] Furthermore, the sealing element is an oil seal.

[0023] Furthermore, it also includes a first locking element and a second locking element;

[0024] The tool mounting shaft includes a first stepped shaft, a second stepped shaft, a third stepped shaft, and a fourth stepped shaft with radial dimensions increasing sequentially. The first locking member is fixedly sleeved on the first stepped shaft and abuts against the first sleeve and the second stepped shaft. The first sleeve is fixedly sleeved on the outside of the second stepped shaft and abuts against the third stepped shaft. The tool fixing part is disposed on the third stepped shaft and abuts against the third sleeve. The third sleeve is fixedly sleeved on the outside of the fourth stepped shaft. The second locking member is fixedly sleeved on the fourth stepped shaft and abuts against the fourth sleeve.

[0025] Furthermore, both the first flange and the second flange are made of high-hardness material, and the areas of the first flange and the second flange that contact the sealing element are subjected to high-frequency quenching heat treatment.

[0026] Furthermore, the first fixing member is provided with a first through hole, one end of which is used for injecting lubricating oil, and the other end is close to the double row cylindrical roller bearing;

[0027] The first fixing member is provided with a second through hole, one end of which is used to inject lubricating oil, and the other end is close to the double row angular contact ball bearing.

[0028] Furthermore, a driving component is installed on the internal milling cutter holder, and the driving component drives the first gear and the second gear to rotate simultaneously through a multi-stage transmission mechanism. The driving component is located on the other side of the tool fixing part.

[0029] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0030] This utility model provides a tool holder support structure for an internal milling cutter. By replacing the existing double-row tapered roller bearings with double-row angular contact ball bearings, a high-precision bearing support is formed, ensuring that the tool holder has high rotational accuracy and high rigidity, ensuring smooth operation of the tool holder, and ensuring high-precision machining of gear rings. Especially for high-precision, large-module gear rings, the machining accuracy is greatly improved, and the obvious discontinuous machining marks on the surface of the machined parts can be reduced.

[0031] This utility model provides a tool mounting shaft support structure for an internal milling cutter holder. By symmetrically arranging double-row angular contact ball bearings and double-row cylindrical roller bearings relative to the tool fixing part, and by symmetrically arranging the second fixing member and the first fixing member relative to the tool fixing part, the tool mounting shaft is ensured to be balanced, so that the tool mounting shaft can run smoothly during operation. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the internal milling of the gears from the first angle of this utility model;

[0033] Figure 2 This is a schematic diagram of the internal milling of the gears from the second angle according to this utility model;

[0034] Figure 3 This utility model Figure 1 Top view of the machining process;

[0035] Figure 4 This is a cross-sectional view of the tool-mounting shaft of this utility model;

[0036] The attached diagram lists the components represented by each number as follows:

[0037] 1. Internal milling cutter holder; 11. Tool mounting shaft through hole; 12. First annular clearance; 13. Second annular clearance; 2. Tool mounting shaft; 21. First stepped shaft; 22. Second stepped shaft; 23. Third stepped shaft; 24. Fourth stepped shaft; 3. Drive component; 4. Support structure; 41. Tool fixing part; 42. First fixing component; 43. Double row cylindrical roller bearing; 44. Second fixing component; 45. Double row angular contact ball bearing; 46. First gear; 461. First shaft 462. First tooth; 47. Second gear; 471. Second bushing; 472. Second tooth; 48. First sleeve; 49. Second sleeve; 410. First flange; 4101. First annular opening groove; 411. Third sleeve; 412. Fourth sleeve; 413. Second flange; 4131. Second annular opening groove; 414. Transition sleeve; 415. First locking element; 416. Second locking element; 5. Cutting tool; 6. Gear ring; 7. Seal. Detailed Implementation

[0038] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0040] It is understood that spatial relation terms such as "below," "under," "below," "below," "above," "above," etc., can be used here to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as "below" or "below" of the other element or feature will be oriented "above" the other element or feature. Therefore, the exemplary terms "below" and "below" can include both upper and lower orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0041] Please see Figure 1 and Figure 2As shown, the internal milling cutter includes an internal milling cutter holder 1, a tool mounting shaft 2, a drive component 3, and a cutting tool 5. The tool mounting shaft 2 is located inside the internal milling cutter holder 1, and the cutting tool 5 is fixed on the tool mounting shaft 2. The drive component 3 is located on the internal milling cutter holder 1 and drives the tool mounting shaft 2 to rotate through a multi-stage transmission mechanism, thereby driving the cutting tool 5 to rotate to mill the teeth.

[0042] In related technologies, the tool mounting shaft 2 is usually supported by a double-row tapered roller bearing on one side and a double-row cylindrical roller bearing 43 on the other side. However, this cannot ensure that the tool mounting shaft 2 operates at high speed, which can easily lead to instability during the operation of the tool mounting shaft 2 and make it difficult to ensure high precision in the machining of the gear ring 6.

[0043] This embodiment provides an internal milling cutter holder tool mounting shaft support structure 4. Please refer to [link / reference]. Figures 1-4 As shown, the tool holder 2 is installed inside the internal milling cutter holder 1 to support the tool mounting shaft 2. The tool holder 2 support structure 4 provided in this embodiment includes a tool fixing part 41, a first fixing member 42, a double-row cylindrical roller bearing 43, a second fixing member 44, and a double-row angular contact ball bearing 45.

[0044] The tool fixing part 41 is located in the middle of the tool mounting shaft 2 and is used to fix the tool 5, which is usually a milling cutter.

[0045] The first fixing member 42 is fixed to the internal milling cutter holder 1 by bolts and is movably sleeved on one end of the tool mounting shaft 2. The first fixing member 2 and the tool mounting shaft 2 are clearance-fitted.

[0046] A double-row cylindrical roller bearing 43 is disposed on one side of the tool fixing part 41. The inner ring of the double-row cylindrical roller bearing 43 is interference-fitted with the outer side of the tool mounting shaft 2 to be fixedly sleeved on the outer side of the tool mounting shaft 2. The outer ring of the double-row cylindrical roller bearing 43 is interference-fitted with the first fixing member 42 to be fixed to the first fixing member 42.

[0047] The second fixing member 44 is fixed to the internal milling cutter holder 1 by bolts and is movably sleeved on the other end of the tool mounting shaft 2. The second fixing member 44 and the first fixing member 42 are symmetrically arranged with respect to the tool fixing part 41.

[0048] A double-row angular contact ball bearing 45 is provided on the other side of the tool fixing part 41. The inner ring of the double-row angular contact ball bearing 45 is interference-fitted with the outer side of the tool mounting shaft 2 to be fixedly sleeved on the outer side of the tool mounting shaft 2. The outer ring of the double-row angular contact ball bearing 45 is interference-fitted with the second fixing member 44 to be fixed to the second fixing member 44. The double-row angular contact ball bearing 45 and the double-row cylindrical roller bearing 43 are symmetrically arranged with respect to the tool fixing part 41.

[0049] This embodiment provides an internal milling cutter holder tool mounting shaft support structure 4, which replaces the existing double-row tapered roller bearing with a double-row angular contact ball bearing 45 to form a high-precision bearing support. This ensures that the tool mounting shaft 2 has high rotational accuracy and high rigidity, enabling it to withstand large radial loads and ensuring smooth operation of the tool mounting shaft 2. This ensures high-precision machining of the gear ring 6, especially for high-precision, large-module gear rings 6, greatly improving machining accuracy and reducing obvious discontinuous machining marks on the surface of the machined parts.

[0050] Furthermore, by symmetrically arranging the double-row angular contact ball bearing 45 and the double-row cylindrical roller bearing 43 relative to the tool fixing part 41, and by symmetrically arranging the second fixing member 44 and the first fixing member 42 relative to the tool fixing part 41, the tool mounting shaft 2 is balanced, ensuring smooth operation during the tool mounting shaft 2 operation.

[0051] In some implementations of this embodiment, please refer to Figure 3 and Figure 4 As shown, it also includes a first gear 46 and a second gear 47.

[0052] The first gear 46 is disposed on one side of the tool fixing part 41. Part of the first gear 46 is fixedly sleeved on the outside of the tool mounting shaft 2 and the other part is movably sleeved on the outside of the first fixing member 42.

[0053] The second gear 47 is disposed on the other side of the tool fixing part 41. Part of the second gear 47 is fixedly sleeved on the outside of the tool mounting shaft 2 and the other part is movably sleeved on the outside of the second fixing member 44. The first gear 46 and the second gear 47 are symmetrically arranged with respect to the tool fixing part 41.

[0054] In this embodiment, by setting a first gear 46 and a second gear 47, and symmetrically arranging the first gear 46 and the second gear 47 with respect to the tool fixing part 41, the driving member 3 drives the first gear 46 and the second gear 47 to rotate simultaneously through a multi-stage transmission mechanism, thereby realizing dual-side gear transmission and ensuring that the tool mounting shaft 2 can transmit large cutting power and maintain torque balance.

[0055] In this embodiment, a portion of the first gear 46 is fixedly sleeved on the outside of the tool-mounting shaft 2, and another portion is movably sleeved on the outside of the first fixing member 42, ensuring that the double-row cylindrical roller bearing 43 can provide a certain support for the first gear 46, bear the weight and motion load of the first gear 46, and ensure that the first gear 46 rotates in the correct position.

[0056] In this embodiment, a portion of the second gear 47 is fixedly sleeved on the outside of the tool-mounting shaft 2, and another portion is movably sleeved on the outside of the second fixing member 44, ensuring that the double-row angular contact ball bearing 45 can provide a certain support for the second gear 47, bear the weight and motion load of the second gear 47, and ensure that the second gear 47 rotates in the correct position.

[0057] In addition, the double-row angular contact ball bearing 45 can withstand axial loads and combined loads with radial loads as the main component. It can adjust the radial and axial clearances to prevent axial movement of the tool shaft 2 and reduce the occurrence of obvious discontinuous machining marks on the surface of the machined parts.

[0058] In one specific embodiment, please refer to Figures 1-4 As shown, the drive unit 3 drives the first gear 46 and the second gear 47 to rotate simultaneously through a 4-stage transmission. Specifically, a third gear is fixed on the output shaft of the drive unit 3. The internal milling cutter holder 1 is rotatably connected to a first transmission shaft, a second transmission shaft, and a third transmission shaft arranged in parallel. A fourth gear and a first pulley are fixed on the first transmission shaft. A second pulley and a third pulley are fixed on the second transmission shaft. A first belt is fitted on the first pulley and the second pulley. A fourth pulley, a fifth gear, and a sixth gear are fixed on the fourth transmission shaft. The fifth gear meshes with the first gear 46, and the sixth gear meshes with the second gear 47.

[0059] In this embodiment, the driving component 3 is a motor.

[0060] In some implementations of this embodiment, please refer to Figure 3 and Figure 4 As shown, the internal milling cutter holder 1 has a tool mounting shaft through hole 11. The tool mounting shaft 2 and the internal milling cutter holder tool mounting shaft support structure 4 provided in this embodiment are set in the tool mounting shaft through hole 11. The machining of the tool mounting shaft through hole 11 and the tool mounting shaft 2 adopts a high-precision coaxial double-sided synchronous machining process, which effectively ensures the double-sided transmission of gears, transmits high power and high torque, and at the same time ensures the smooth operation of the tool mounting shaft 2 in internal milling machining.

[0061] In this embodiment, the first fixing member 42 is fixed to the inner wall of the tool shaft through hole 11, and the second fixing member 44 is fixed to the inner wall of the tool shaft through hole 11.

[0062] In some embodiments of this example, the tool mounting shaft 2 is also positioned to further support it. Please refer to [link / reference]. Figure 3 and Figure 4As shown, it also includes a first sleeve 48, a second sleeve 49, and a first flange 410. The first sleeve 48 is fixedly sleeved on the outside of the tool mounting shaft 2 by a flat key and is located on one side of the tool fixing part 41. The first gear 46 includes a first bushing 461 and a first tooth 462. The first bushing 461 is fixedly sleeved on the end of the first sleeve 48 near the tool fixing part 41 by bolts. The first tooth 462 is located on the first bushing 461 and extends along the axial direction of the tool mounting shaft 2. The first tooth 462 is clearance-fitted with the outside of the first fixing member 42 to be movably sleeved on the first fixing member 41. On the outside of part 42, the second sleeve 49 is sleeved on the outside of the tool mounting shaft 2 and fixed to the other end of the first sleeve 48 away from the tool fixing part 41 by bolts. The first flange 410 is located between the second sleeve 49 and the first fixing part 42. The first flange 410 and the first fixing part 42 are fixed by bolts. The inner ring of the double-row cylindrical roller bearing 43 is interference-fitted with the outside of the first sleeve 48 to be fixedly sleeved on the outside of the first sleeve 48. One end of the double-row cylindrical roller bearing 43 abuts against the first bushing 461, and the other end abuts against the first flange 410 and the second sleeve 49.

[0063] In some implementations of this embodiment, please refer to Figure 3 and Figure 4 As shown, the first fixing member 42 has a Z-shaped cross section. The first fixing member 42 includes an integrally formed first annular cylinder, a second annular cylinder, and a third annular cylinder. The first annular cylinder is fixed to the internal milling cutter holder 1 by bolts. One end of the second annular cylinder abuts against the first flange 410, and the other end abuts against the first protrusion inside the internal milling cutter holder 1. The outer ring of the double-row cylindrical roller bearing 43 is fixed with the inner side of the third annular cylinder by interference fit. The first tooth 462 is clearance-fitted with the outer side of the third annular cylinder to be movably sleeved on the outer side of the third annular cylinder.

[0064] In some embodiments of this example, the cross-section of the second fixing member 44 is L-shaped. The second fixing member 44 includes an integrally formed fourth annular cylinder and a fifth annular cylinder. The fourth annular cylinder is fixed to the internal milling cutter holder 1 by bolts. The fourth annular cylinder abuts against the second protrusion inside the internal milling cutter holder 1. The outer ring of the double-row angular contact ball bearing 45 is fixed with the inner side of the fourth annular cylinder and the fifth annular cylinder by interference fit. The second tooth 472 is clearance-fitted with the outer side of the fifth annular cylinder to be movably sleeved on the outer side of the fifth annular cylinder.

[0065] In some implementations of this embodiment, please refer to Figure 3 and Figure 4As shown, it also includes a third sleeve 411, a fourth sleeve 412, and a second flange 413. The third sleeve 411 is fixedly sleeved on the outside of the tool mounting shaft 2 by a flat key and is located on the other side of the tool fixing part 41. The second gear 47 includes a second bushing 471 and a second tooth 472. The second bushing 471 is fixedly sleeved on the end of the third sleeve 411 near the tool fixing part 41 by bolts. The second tooth 472 is located on the second bushing 471 and extends along the axial direction of the tool mounting shaft 2. The second tooth 472 is clearance-fitted with the outer side of the second fixing member 44 to be movably sleeved on the second fixing member 44. On the outside of component 44, the fourth sleeve 412 is sleeved on the outside of the tool mounting shaft 2 and fixed to the other end of the third sleeve 411 away from the tool fixing part 41 by bolts. The second flange 413 is located between the fourth sleeve 412 and the second fixing part 44. The second flange 413 and the second fixing part 44 are fixed by bolts. The inner ring of the double row angular contact ball bearing 45 is interference-fitted with the outside of the third sleeve 411 to be fixedly sleeved on the outside of the third sleeve 411. One end of the double row angular contact ball bearing 45 abuts against the first bushing 461, and the other end abuts against the second flange 413 and the fourth sleeve 412.

[0066] In some implementations of this embodiment, please refer to Figure 3 and Figure 4 As shown, in order to further position the tool mounting shaft 2, a first locking member 415 and a second locking member 416 are also included.

[0067] The tool mounting shaft 2 includes a first stepped shaft 21, a second stepped shaft 22, a third stepped shaft 23, and a fourth stepped shaft 24, whose radial dimensions increase sequentially. A first locking member 415 is threadedly connected to the first stepped shaft 21 to be fixedly sleeved on the first stepped shaft 21 and abuts against one end of the first sleeve 48 and one end of the second stepped shaft 22. The first sleeve 48 is fixedly sleeved on the outside of the second stepped shaft 22, and the other end of the first sleeve 48 abuts against one end of the third stepped shaft 23 and one end of the tool fixing part 41. 41 is located on the third stepped shaft 23. The other end of the tool fixing part 41 abuts against one end of the third sleeve 411 and one end of the fourth stepped shaft 24. The third sleeve 411 is fixedly sleeved on the outside of the fourth stepped shaft 24. The other end of the third sleeve 411 abuts against one end of the fourth sleeve 412. The fourth sleeve 412 is fixedly sleeved on the outside of the fourth stepped shaft 24. The second locking member 416 is threadedly connected to the fourth stepped shaft 24 to be fixedly sleeved on the fourth stepped shaft 24 and abuts against the other end of the fourth sleeve 412.

[0068] For related technologies, please refer to Figure 3 and Figure 4As shown, the first flange 410 and the second flange 413 are sealed with star-shaped seals. After processing for a period of time, there is some wear on the contact surfaces of the first flange 410 and the second flange 413 and the star-shaped seals. When the maximum temperature of the tool shaft 2 exceeds 65°C, the oil on the tool shaft 2 will overflow, resulting in poor sealing effect.

[0069] In some embodiments of this example, to improve the existing sealing situation, please refer to... Figure 3 and Figure 4 As shown, a first annular opening groove 4101 is provided on the first flange 410, and the first annular opening groove 4101 surrounds the first sleeve 48; a first annular gap 12 is provided between the outer side of the first tooth 462 and the inner milling cutter holder 1; a sealing element 7 is provided in both the first annular opening groove 4101 and the first annular gap 12.

[0070] Please see Figure 3 and Figure 4 As shown, a second annular opening groove 4131 is provided on the second flange 413, and the second annular opening groove 4131 surrounds the fourth sleeve 412; a second annular gap 13 is provided between the outer side of the second tooth 472 and the inner milling cutter holder 1; a sealing element 7 is provided in both the second annular opening groove 4131 and the second annular gap 13.

[0071] Thus, by setting the seal 7, radial sealing of the inlet is achieved on both sides of the tool-loading shaft 2.

[0072] In some embodiments of this example, the seal 7 is an oil seal, ensuring that radial oil seals are achieved on both sides of the tool-mounting shaft 2.

[0073] Specifically, this embodiment is a medium-pressure oil seal, specifically a TSS TRU type oil seal. The TSS TRU type oil seal is a high-performance oil seal developed by NOK Corporation (Japan Oil Seal Co., Ltd.), and belongs to the category of rotary shaft oil seals with double-lip dustproof design.

[0074] In some embodiments of this example, the first fixing member 42 and the second fixing member 44 are both made of high-hardness material. The areas of the first fixing member 42 and the second fixing member 44 that contact the seal member 7 are subjected to high-frequency quenching heat treatment, which makes the milling process more stable, effectively prevents vibration under the action of large cutting force of the milling cutter head, improves the wear resistance of the first fixing member 42 and the second fixing member 44, avoids wear at the areas of the first fixing member 42 and the second fixing member 44 that contact the oil seal during the high-speed rotation of the tool holder shaft 2, prevents the leakage of circulating oil in the tool holder, and significantly improves the machining accuracy level.

[0075] Among them, high-frequency quenching heat treatment is a surface heat treatment process that uses electromagnetic induction to heat the surface layer of the workpiece and then rapidly cools it, significantly improving the hardness, wear resistance, and fatigue strength of the metal surface, while maintaining the toughness and plasticity of the first fixing member 42 and the second fixing member 44. By applying high-frequency quenching heat treatment to the areas of the first fixing member 42 and the second fixing member 44 in contact with the sealing member 7, wear in these areas is reduced, thereby further preventing radial oil leakage on the tool mounting shaft 2.

[0076] In some embodiments of this example, the first fixing member 42 is provided with a first through hole, one end of which is used to inject lubricating oil, and the other end is close to the double row cylindrical roller bearing 43.

[0077] The first fixing member 42 is provided with a second through hole. One end of the second through hole is used to inject lubricating oil, and the other end is close to the double row angular contact ball bearing 45.

[0078] In this embodiment, lubricating oil is injected to lubricate and cool the various components.

[0079] In some embodiments of this example, the drive member 3 drives the first gear 46 and the second gear 47 to rotate simultaneously through a multi-stage transmission mechanism. The drive member 3 is located on the other side of the tool fixing part 41 and is set on the same side as the double-row angular contact ball bearing 45, which ensures that the transmission link is short, the clearance error is small and controllable, and the force is more stable and reliable.

[0080] In some embodiments of this example, the machining parameters of the gear ring are specified according to the agreement requirements, such as the maximum diameter, minimum diameter, and machining module. Based on the parameter requirements, the machining form is simulated, with the outer contour circle as the workpiece. During the milling cutter's feed, to avoid interference between the first fixing member 42 and the second fixing member 44 and the inner circle of the workpiece, the interfering parts need to be removed. Considering machining errors and assembly errors, the transition sleeve 414 needs to be ground according to the actual situation when adjusting the center position of the milling cutter.

[0081] In this embodiment, the transition sleeve 414 is clearance-fitted with the tool fixing part 41, and the tool 5 and the transition sleeve 414 are snapped together.

[0082] Specifically, either the transition sleeve 414 or the cutting tool 5 is provided with a locking block, and the other of the transition sleeve 414 or the cutting tool 5 is provided with a locking slot. The cutting tool 5 and the transition sleeve 414 are engaged by locking the locking block and locking slot.

[0083] In summary, the internal milling cutter holder tool mounting shaft support structure 4 provided by this utility model can ensure the machining accuracy of the gear ring 6 and improve the surface finish. Through oil seals and centralized lubrication and circulating cooling, the heat generation of the tool mounting shaft 2 can be effectively controlled, reducing machining noise. The accuracy grade of the internal milling gear ring reaches within level 8, meeting the accuracy requirements of most customers. While ensuring the rigidity of the machine tool itself, this structure makes the machining performance more stable, greatly reducing the errors in tooth profile, tooth direction, and tooth pitch during the machining of parts such as gear rings, improving the overall machine accuracy, and realizing the openness of the structural space.

[0084] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A tool holder support structure for an internal milling cutter post, installed inside an internal milling cutter post for supporting the tool holder shaft, characterized in that, include: A tool fixing part is provided in the middle of the tool mounting shaft and is used to fix the tool; The first fixing member is fixed to the internal milling cutter holder and movably sleeved on one end of the tool mounting shaft; A double-row cylindrical roller bearing is provided on one side of the tool fixing part. The inner ring of the double-row cylindrical roller bearing is fixedly sleeved on the outside of the tool mounting shaft, and the outer ring of the double-row cylindrical roller bearing is fixed to the first fixing member. The second fixing member is fixed to the internal milling cutter holder and movably sleeved on the other end of the tool mounting shaft. The second fixing member and the first fixing member are symmetrically arranged with respect to the tool fixing part. A double-row angular contact ball bearing is provided on the other side of the tool fixing part. The inner ring of the double-row angular contact ball bearing is fixedly sleeved on the outside of the tool mounting shaft, and the outer ring of the double-row angular contact ball bearing is fixed to the second fixing member. The double-row angular contact ball bearing and the double-row cylindrical roller bearing are symmetrically arranged with respect to the tool fixing part.

2. The internal milling cutter holder tool mounting shaft support structure according to claim 1, characterized in that: It also includes the first gear and the second gear; The first gear is disposed on one side of the tool fixing part, and a portion of the first gear is fixedly sleeved on the outside of the tool mounting shaft and the other portion is movably sleeved on the outside of the first fixing member. The second gear is disposed on the other side of the tool fixing part. Part of the second gear is fixedly sleeved on the outside of the tool mounting shaft and the other part is movably sleeved on the outside of the second fixing member. The first gear and the second gear are symmetrically arranged with respect to the tool fixing part.

3. The internal milling cutter holder tool shaft support structure according to claim 2, characterized in that: It also includes a first sleeve, a second sleeve, and a first flange. The first sleeve is fixedly sleeved on the outside of the tool mounting shaft and disposed on one side of the tool fixing part. The first gear includes a first bushing and a first tooth. The first bushing is fixedly sleeved on one end of the first sleeve near the tool fixing part. The first tooth is disposed on the first bushing and extends along the axial direction of the tool mounting shaft. The first tooth is movably sleeved on the outside of the first fixing member. The second sleeve is sleeved on the outside of the tool mounting shaft and fixed on the other end of the first sleeve away from the tool fixing part. The first flange is disposed between the second sleeve and the first fixing member. The first flange and the first fixing member are fixed. The inner ring of the double-row cylindrical roller bearing is fixedly sleeved on the outside of the first sleeve. One end of the double-row cylindrical roller bearing abuts against the first bushing, and the other end abuts against the first flange and the second sleeve.

4. The internal milling cutter holder tool mounting shaft support structure according to claim 3, characterized in that: It also includes a third sleeve, a fourth sleeve, and a second flange. The third sleeve is fixedly sleeved on the outside of the tool mounting shaft and disposed on the other side of the tool fixing part. The second gear includes a second bushing and a second tooth. The second bushing is fixedly sleeved on one end of the third sleeve near the tool fixing part. The second tooth is disposed on the second bushing and extends along the axial direction of the tool mounting shaft. The second tooth is movably sleeved on the outside of the second fixing member. The fourth sleeve is sleeved on the outside of the tool mounting shaft and fixed on the other end of the third sleeve away from the tool fixing part. The second flange is disposed between the fourth sleeve and the second fixing member. The second flange and the second fixing member are fixed. The inner ring of the double-row angular contact ball bearing is fixedly sleeved on the outside of the third sleeve. One end of the double-row angular contact ball bearing abuts against the first bushing, and the other end abuts against the second flange and the fourth sleeve.

5. The internal milling cutter holder tool mounting shaft support structure according to claim 4, characterized in that: The first flange has a first annular opening groove, which surrounds the second sleeve; There is a first annular gap between the outer side of the first tooth and the internal milling cutter holder; The second flange is provided with a second annular opening groove, which surrounds the fourth sleeve; There is a second annular gap between the outer side of the second tooth and the internal milling cutter holder; The first annular opening groove, the first annular gap, the second annular opening groove, and the second annular gap are all equipped with sealing elements.

6. The internal milling cutter holder tool shaft support structure according to claim 5, characterized in that: The sealing element is an oil seal.

7. The internal milling cutter holder tool mounting shaft support structure according to claim 4, characterized in that: It also includes a first locking element and a second locking element; The tool mounting shaft includes a first stepped shaft, a second stepped shaft, a third stepped shaft, and a fourth stepped shaft with radial dimensions increasing sequentially. The first locking member is fixedly sleeved on the first stepped shaft and abuts against the first sleeve and the second stepped shaft. The first sleeve is fixedly sleeved on the outside of the second stepped shaft and abuts against the third stepped shaft. The tool fixing part is disposed on the third stepped shaft and abuts against the third sleeve. The third sleeve is fixedly sleeved on the outside of the fourth stepped shaft. The second locking member is fixedly sleeved on the fourth stepped shaft and abuts against the fourth sleeve.

8. The internal milling cutter holder tool mounting shaft support structure according to claim 4, characterized in that: Both the first flange and the second flange are made of high-hardness material, and the areas of the first flange and the second flange that contact the sealing element are subjected to high-frequency quenching heat treatment.

9. The internal milling cutter holder tool mounting shaft support structure according to claim 1, characterized in that: The first fixing member is provided with a first through hole, one end of which is used to inject lubricating oil, and the other end is close to the double row cylindrical roller bearing; The first fixing member is provided with a second through hole, one end of which is used to inject lubricating oil, and the other end is close to the double row angular contact ball bearing.

10. The internal milling cutter holder tool shaft support structure according to claim 2, characterized in that: A drive unit is mounted on the internal milling cutter holder. The drive unit drives the first gear and the second gear to rotate simultaneously through a multi-stage transmission mechanism. The drive unit is located on the other side of the tool fixing part.

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