Auxiliary fixing device for spiral bevel gear cutting machining

Abstract

An auxiliary fixing device for spiral bevel gear cutting machining comprises a first connecting disc, a second connecting disc, a tire body, an expansion mechanism and a power part. The tire body is fixed to the end face of the first connecting disc. The second connecting disc is sleeved and fixed on the left side of the tire body; the left end of the tire body extends out of the second connecting disc; the expansion mechanism comprises a pull rod and an expansion sleeve; the expansion sleeve is installed at the left end of the pull rod and arranged at the left end of the tire body in a sleeving mode, the left end of the pull rod axially penetrates through the first connecting disc and the tire body, the right end of the pull rod is connected with the power part, and the pull rod moves on the right side in the axial direction of the tire body so that the expansion sleeve can clamp a workpiece in an inner supporting expansion mode. The pull rod moves along the left side of the axial direction of the tire body, so that the expansion sleeve is separated from the workpiece. When the self-centering tool is used, axial tension generated by the pull rod is converted into radial force, so that the inner hole of the workpiece is expanded by the expansion sleeve, and the self-centering tool has relatively strong expansion force while self-centering; only the taper sleeve needs to be replaced for one set of tool, the whole set of tool does not need to be replaced, and the workpiece clamping precision and efficiency are higher.

Description

Technical Field

[0001] The present invention relates to the technical field of gear processing, and in particular to an auxiliary fixing device for spiral bevel gear cutting processing. Background Art

[0002] Klinge & Berger spiral bevel gears require machining on a dedicated German Klinge & Berger C60U gear cutting machine. Due to the limited availability and market share of this type of machine, the specialized fixtures currently available are outdated and undergoing slow iteration. The existing gear cutting fixtures utilize end-face clamping, which creates a gap between the inner bore and the fixture's locating axis. This requires alignment every time the workpiece is clamped, resulting in poor positioning accuracy, difficult and time-consuming installation, and prolonged auxiliary operations. Frequent clamping also wears the end face of the machine tool's spindle, reducing clamping accuracy and stability, impacting workpiece machining precision and quality. Summary of the Invention

[0003] In order to solve the technical problems existing in the above technology, it is necessary to provide an auxiliary fixing device for spiral bevel gear cutting.

[0004] A spiral bevel gear cutting auxiliary fixing device includes a first connecting plate, a second connecting plate, a carcass, an expansion mechanism, and a power unit; The carcass is fixed to the end surface of the first connecting plate; The second connecting plate is fixed to the left side of the carcass, and the left end of the carcass extends out of the second connecting plate; The expansion mechanism includes a pull rod and an expansion sleeve; the expansion sleeve is installed at the left end of the pull rod and is sleeved on the left end of the carcass. The left end of the pull rod axially passes through the first connecting plate and the carcass, and the right end of the pull rod is connected to the power unit. When the power unit drives the pull rod to move along the right side of the axial direction of the carcass, the left end of the carcass squeezes the expansion sleeve to deform, thereby achieving internal support and clamping of the workpiece by the expansion sleeve; when the power unit drives the pull rod to move along the left side of the axial direction of the carcass, the left end of the carcass does not squeeze the expansion sleeve, thereby achieving separation of the expansion sleeve from the workpiece.

[0005] Preferably, the right end of the carcass has a positioning protrusion that can extend into the interior of the first connecting plate, and the right end of the carcass has a frustum that is adapted to the expansion sleeve.

[0006] Preferably, the carcass is provided with a support platform located on the right side of the truncated cone, which is adapted to the inner hole of the workpiece and has a diameter larger than the maximum diameter of the truncated cone.

[0007] Preferably, a through hole for the pull rod to pass through is opened along the axial direction of the carcass.

[0008] Preferably, an anti-rotation member for limiting the rotation of the workpiece is installed on the left end surface of the second connecting disk.

[0009] Preferably, a circular hole is provided along the axis of the second connecting plate, and the diameter of the circular hole is larger than the diameter of the supporting platform.

[0010] Preferably, the pull rod includes a first connecting rod and a second connecting rod; the first connecting rod is built into the carcass along the carcass axis, and both ends of the first connecting rod extend out of the carcass, the left end of the first connecting rod is fitted with a pressure cover for pressing the expansion sleeve, and the right end of the first connecting rod is connected to the end of the second connecting rod.

[0011] Preferably, a positioning pressure head with an "I"-shaped structure is detachably installed on the left end of the first connecting rod, and an I-shaped hole for the positioning pressure head to pass through is opened on the pressure cover, and the left end face of the pressure cover has an accommodating hole for accommodating the positioning pressure head and connecting to the I-shaped hole.

[0012] Preferably, a retaining ring for blocking the expansion sleeve is fixedly provided on the first connecting rod, and the retaining ring and the pressure cover clamp the expansion sleeve therebetween.

[0013] Preferably, a guide groove is provided along the axial direction of the outer wall of the first connecting rod, and a stop pin extending into the guide groove is fixed along the radial direction of the positioning protrusion.

[0014] Compared with the prior art, the spiral bevel gear tooth cutting auxiliary fixing device provided by the present invention can install the first connecting disk on the main shaft of the machine tool, and then assemble the second connecting disk, the tire body, and the expansion mechanism; the second connecting disk is used in conjunction with the workpiece. During use, it is only necessary to align the outer cylindrical end face of the second connecting disk, and there is no need to align the workpiece subsequently. The power unit pull rod moves along the right side of the tire body axial direction, so that the left end of the tire body squeezes the expansion sleeve to deform, and the expansion sleeve is internally supported to clamp the workpiece; when the power unit drives the pull rod to move along the left side of the tire body axial direction, the left end of the tire body does not squeeze the expansion sleeve, and the expansion sleeve is separated from the workpiece. When in use, the present invention converts the axial pulling force generated by the pull rod into radial force, and realizes the clamping of the workpiece by the expansion sleeve by expanding the inner hole of the workpiece, so that the tooling is self-centering and has a strong expansion force; for a set of tooling, only the taper sleeve needs to be replaced, and soft cutting and hard cutting can be satisfied at the same time, and there is no need to replace the entire set of tooling, and the workpiece clamping accuracy and efficiency are higher; the first connecting plate is installed on the machine tool spindle to be used as a transition piece, which is universal. When the tooling is replaced, it will not cause wear to the machine tool spindle, thereby ensuring the accurate positioning, clamping accuracy and stability of the workpiece, and ensuring the accuracy and quality of subsequent workpiece processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 It is a structural schematic diagram of the present invention.

[0017] Figure 2 It is a structural schematic diagram of the tire body of the present invention.

[0018] Figure 3 For the present invention Figure 2 Schematic diagram of the cross-sectional structure.

[0019] Figure 4 This is a schematic structural diagram of the first connecting disk of the present invention.

[0020] Figure 5 For the present invention Figure 4 Schematic diagram of the structure from another angle.

[0021] Figure 6 It is a structural schematic diagram of the second connecting disk of the present invention.

[0022] Figure 7 It is a structural schematic diagram of the connection between the carcass and the pull rod of the present invention.

[0023] Figure 8 It is a structural schematic diagram of the gland of the present invention.

[0024] Figure 9 For the present invention Figure 8 Schematic diagram of the structure from another angle.

[0025] Figure 10 Schematic diagram of the structure of the first connecting rod of the present invention.

[0026] Figure 11 It is a structural schematic diagram of the expansion sleeve of the present invention.

[0027] In the figure: the first connecting plate 01, the end 11, the T-slot 12, the second connecting plate 02, the anti-rotation part 21, the circular hole 22, the carcass 03, the positioning protrusion 31, the frustum 32, the support platform 33, the through hole 34, the expansion mechanism 04, the pull rod 41, the first connecting rod 411, the second connecting rod 412, the positioning pressure head 413, the retaining ring 414, the guide groove 415, the expansion sleeve 42, the notch 421, the pressure cover 05, the I-shaped hole 51, the accommodating hole 52, the stop pin 06, the workpiece 07, the machine tool spindle 08, and the power unit 09. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be understood that the terms "upper", "middle", "outer", "inner", "lower" and the like indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention.

[0030] Please see Figure 1 The present invention provides a spiral bevel gear cutting auxiliary fixing device, comprising a first connecting plate 01, a second connecting plate 02, a carcass 03, and an expansion mechanism 04; Among them, the first connecting plate 01 is installed on the end face of the machine tool spindle by bolts when in use. In order to ensure the accuracy and stability of the assembly of the first connecting plate 01 and the end face of the machine tool spindle, an end face key can also be installed on the contact surface of the first connecting plate 01 and the machine tool spindle to fasten the two.

[0031] The carcass 03 is fixed to the end face of the first connecting plate 01. Bolts can be used to secure the carcass 03 to the left end face of the first connecting plate 01, making it easier to remove and install. Of course, other methods can be used to secure the carcass 03 to the first connecting plate 01, such as welding, threaded connections, or key connections.

[0032] The second connecting plate 02 is fixed to the left side of the carcass 03, with the left end of the carcass 03 extending outward from the second connecting plate 02. Bolts can be used to secure the second connecting plate 02 to the left end of the carcass 03, ensuring easier removal and installation. The second connecting plate 02 is used in conjunction with the workpiece to provide end face positioning and anti-rotation protection. During use, only the outer end face of the second connecting plate 02 needs to be aligned; subsequent alignment of the workpiece is not necessary.

[0033] The expansion mechanism 04 includes a pull rod 41 and an expansion sleeve 42. The expansion sleeve 42 is mounted on the left end of the pull rod 41 and is mounted on the left end of the carcass 03. The left end of the pull rod 41 axially extends through the first connecting plate 01 and the carcass 03, while the right end of the pull rod 41 is connected to the power unit 09 to provide axial tension. Of course, the power unit 09 can utilize the machine tool's own hydraulic system to control the hydraulic cylinder to achieve reciprocating control of the pull rod 41, thereby ensuring higher workpiece clamping accuracy and efficiency. When the power unit 09 drives the pull rod 41 to move axially to the right of the carcass 03, the left end of the carcass 03 squeezes the expansion sleeve 42, causing it to deform and clamp the workpiece. When the power unit 09 drives the pull rod 41 to move axially to the left of the carcass 03, the left end of the carcass 03 no longer squeezes the expansion sleeve 42, allowing the expansion sleeve 42 to separate from the workpiece. When in use, the axial pulling force generated by the pull rod 41 is converted into radial force, so that the expansion sleeve 42 can expand the inner hole of the workpiece to clamp the workpiece, so that the tooling can be self-centering and have a strong expansion force; for a set of tooling, only the taper sleeve needs to be replaced, which can meet the needs of soft cutting and hard cutting at the same time, and there is no need to replace the entire set of tooling, so the workpiece clamping accuracy and efficiency are higher; the first connecting plate 01 is installed on the machine tool spindle as a transition piece, which is universal. When the tooling is replaced, it will not cause wear to the machine tool spindle, thereby ensuring the accurate positioning, clamping accuracy and stability of the workpiece, and ensuring the accuracy and quality of subsequent workpiece processing.

[0034] Please see Figure 2 、 Figure 3 In one embodiment, the right end of the carcass 03 has a positioning protrusion 31 that can extend into the interior of the first connecting disk 01 and fits within the inner hole of the first connecting disk 01. The right end of the carcass 03 also has a truncated cone 32 that fits within the expansion sleeve 42. The truncated cone 32 formed at the left end of the carcass 03 precisely mates with the tapered hole within the expansion sleeve 42. When the expansion sleeve 42 moves rightward under the action of the tension rod 41, the truncated cone 32 exerts radial pressure on the expansion sleeve 42, causing it to deform. This allows the expansion sleeve 42 to expand and clamp the workpiece. When the expansion sleeve 42 moves leftward under the action of the tension rod 41, the truncated cone 32 disengages from the workpiece inner hole, allowing the expansion sleeve 42 to return to its original state.

[0035] Specifically, there is a support platform 33 on the carcass 03, and the support platform 33 is located on the right side of the frustum 32, and the support platform 33 is adapted to the inner hole of the workpiece, and the diameter of the support platform 33 is larger than the maximum diameter of the frustum 32.

[0036] Please see Figures 4 to 6Correspondingly, a circular hole 22 is opened along the axis of the second connecting disk 02, and the diameter of the circular hole 22 is larger than the diameter of the support platform 33; when the workpiece is installed on the left end face of the second connecting disk 02, the influence of gravity will exert a downward force on the expansion sleeve 42 and the frustum 32, which will affect the durability of the expansion sleeve 42 and the accuracy of the workpiece after tightening. By fitting the inner hole of the workpiece on the support platform 33, an effective radial support effect is formed on the workpiece, which can effectively solve the influence of gravity on the expansion sleeve 42 and is safer and more reliable.

[0037] Secondly, in order to facilitate the axial reciprocating movement of the pull rod 41, a through hole 34 for the pull rod 41 to pass through is opened along the axial direction of the tire body 03.

[0038] In one embodiment, to prevent the workpiece from rotating during cutting, an anti-rotation feature 21 is installed on the left end face of the second connecting plate 02 to limit workpiece rotation. The anti-rotation feature 21 is secured to the left end face of the second connecting plate 02 by screws, and a groove adapted to the anti-rotation feature 21 may be pre-defined on the end face of the workpiece facing the anti-rotation feature 21. It is also conceivable that the anti-rotation feature 21 could be arranged symmetrically along the diameter of the second connecting plate 02. This, in conjunction with the support platform 33, would minimize the impact on the expansion sleeve 42 and ensure precise clamping.

[0039] Please see Figures 7 to 10 In one embodiment, the tie rod 41 includes a first connecting rod 411 and a second connecting rod 412. The first connecting rod 411 is embedded in the carcass 03 along its axis, with both ends extending out of the carcass 03. The left end of the first connecting rod 411 is mounted on the gland 05 of the expansion sleeve 42, while the right end of the first connecting rod 411 is connected to the end of the second connecting rod 412. The first and second connecting rods 411 and 412 can be threadedly connected, making assembly and disassembly of the tie rod 41 easier.

[0040] Specifically, the left end of the first connecting rod 411 is removably mounted with an "I"-shaped positioning head 413. The gland 05 is provided with an I-shaped hole 51 for the positioning head 413 to pass through. The left end surface of the gland 05 has a receiving hole 52 that accommodates the positioning head 413 and communicates with the I-shaped hole 51. During installation, the positioning head 413 at the end of the first connecting rod 411 passes through the I-shaped hole 51 in the gland 05 and is placed in the receiving hole 52. The gland 05 can then be rotated to create an offset between the positioning head 413 and the I-shaped hole 51. This allows the first connecting rod 411 to move axially, causing the gland 05 to squeeze the expansion sleeve 42.

[0041] Specifically, a retaining ring 414 for blocking the expansion sleeve 42 is fixed on the first connecting rod 411 , and the retaining ring 414 and the pressure cover 05 clamp the expansion sleeve 42 therebetween.

[0042] In one embodiment, a guide groove 415 is defined along the axial direction of the outer wall of the first connecting rod 411. Accordingly, a stop pin 06 is fixed along the radial direction of the positioning protrusion 31, extending into the guide groove 415. The stop pin 06 can limit the rotation of the first connecting rod 411 and provide guidance for the first connecting rod 411 during its axial movement. The stop pin 06 can be secured by pre-setting a mounting hole in the radial direction of the positioning protrusion 31. Once the stop pin 06 is placed in the mounting hole, the end of the stop pin 06 extends into the guide groove 415. The stop pin 06 can then be secured by installing a screw in the axial direction of the positioning protrusion 31.

[0043] In one embodiment, the right end surface of the first connecting disk 01 has an end 11 that can be inserted into the inner hole of the machine tool spindle, and the end 11 will be adapted to the inner hole of the machine tool spindle; at the same time, the positioning protrusion 31 at the right end of the tire body 03 will also be inserted into the inner hole of the first connecting disk 01 during installation. Through the above method, it can be ensured that the first connecting disk 01 and the tire body 03 are concentric and coaxial. Secondly, when the pull rod 41 is assembled, the pull rod 41 just passes through the through hole 34 on the tire body 03, so that the pull rod 41 will also be concentric and coaxial with the first connecting disk 01 and the tire body 03, so that the installation accuracy can be guaranteed.

[0044] Secondly, in order to meet the positioning size connection of different carcasses 03, T-slots 12 are evenly distributed along the radial direction of the first connecting plate 01. The number of T-slots 12 can be determined according to demand. In this solution, 4 can be selected; of course, it is conceivable that other numbers are also possible.

[0045] Please see Figure 11 In one embodiment, notches 421 are defined along the axial direction of the outer wall of the expansion sleeve 42. These notches 421 are evenly distributed along the circumference of the outer wall of the expansion sleeve 42, forming a multi-petal structure. When the expansion sleeve 42 is squeezed by the frustum 32, the notches 421 on the expansion sleeve 42 enlarge, and the outer profile of the expansion sleeve 42 gradually expands, allowing the outer wall of the expansion sleeve 42 to fit tightly against the inner hole of the workpiece.

[0046] The above disclosure is only a preferred embodiment of the present invention, and it is certainly not intended to limit the scope of the present invention. A person skilled in the art can understand that all or part of the processes of the above embodiment and equivalent changes made in accordance with the claims of the present invention are still within the scope of the invention.

Claims

1. A spiral bevel gear cutting auxiliary fixture, characterized by: It includes a first connecting plate, a second connecting plate, a carcass, an expansion mechanism, and a power unit; The carcass is fixed to the end surface of the first connecting plate; The second connecting plate is fixed to the left side of the carcass, and the left end of the carcass extends out of the second connecting plate; The expansion mechanism includes a pull rod and an expansion sleeve; the expansion sleeve is installed at the left end of the pull rod and is sleeved on the left end of the carcass. The left end of the pull rod axially passes through the first connecting plate and the carcass, and the right end of the pull rod is connected to the power unit. When the power unit drives the pull rod to move along the right side of the axial direction of the carcass, the left end of the carcass squeezes the expansion sleeve to deform, thereby achieving internal support and clamping of the workpiece by the expansion sleeve; when the power unit drives the pull rod to move along the left side of the axial direction of the carcass, the left end of the carcass does not squeeze the expansion sleeve, thereby achieving separation of the expansion sleeve from the workpiece.

2. The spiral bevel gear cutting auxiliary fixing device according to claim 1, characterized in that: The right end of the carcass is provided with a positioning protrusion which can extend into the interior of the first connecting disk, and the right end of the carcass is provided with a truncated cone which is adapted to the expansion sleeve.

3. The spiral bevel gear cutting auxiliary fixing device according to claim 2, characterized in that: The carcass is provided with a support platform on the right side of the truncated cone, which is adapted to the inner hole of the workpiece and has a diameter larger than the maximum diameter of the truncated cone.

4. The spiral bevel gear cutting auxiliary fixing device according to claim 3, characterized in that: A through hole for the pull rod to pass through is opened along the axial direction of the carcass.

5. The spiral bevel gear cutting auxiliary fixing device according to claim 3, characterized in that: An anti-rotation member for limiting the rotation of the workpiece is installed on the left end surface of the second connecting plate.

6. The spiral bevel gear cutting auxiliary fixing device according to claim 5, characterized in that: A circular hole is provided along the axis of the second connecting plate, and the diameter of the circular hole is larger than the diameter of the supporting platform.

7. The spiral bevel gear cutting auxiliary fixing device according to claim 2, characterized in that: The pull rod includes a first connecting rod and a second connecting rod; the first connecting rod is built into the carcass along the carcass axis, and both ends of the first connecting rod extend out of the carcass, the left end of the first connecting rod is fitted with a pressure cover for pressing the expansion sleeve, and the right end of the first connecting rod is connected to the end of the second connecting rod.

8. The spiral bevel gear cutting auxiliary fixing device according to claim 7, characterized in that: The left end of the first connecting rod is detachably mounted with a positioning pressure head in an "I"-shaped structure, and the pressure cover is provided with an I-shaped hole for the positioning pressure head to pass through, and the left end face of the pressure cover has an accommodating hole for accommodating the positioning pressure head and connected to the I-shaped hole.

9. The spiral bevel gear cutting auxiliary fixing device according to claim 8, characterized in that: A retaining ring for blocking the expansion sleeve is fixedly provided on the first connecting rod, and the retaining ring and the pressure cover clamp the expansion sleeve therebetween.

10. The spiral bevel gear cutting auxiliary fixing device according to claim 2, characterized in that: A guide groove is provided along the axial direction of the outer wall of the first connecting rod, and a stop pin extending into the guide groove is fixed along the radial direction of the positioning protrusion.

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