A gear hobbing machine secondary gear hobbing clamp

Abstract

This application relates to the field of gear hobbing technology, and provides a gear hobbing machine secondary hobbing fixture, which includes a sleeve for fitting onto a center base. The center base has a center hole, and the sleeve has a through hole for the workpiece to pass through. When fitted onto the center base, the workpiece can pass through the through hole and extend into the center hole. The sleeve also has an insertion hole located on the periphery of the through hole. A positioning member has a rod for inserting into the insertion hole and a positioning plate connected to the rod. The positioning plate has a positioning hole, and the inner peripheral wall of the positioning hole is provided with at least two positioning teeth. When the rod is inserted into the insertion hole, the positioning teeth engage with the tooth groove of the workpiece. By using the positioning teeth of the positioning member that are adapted to the tooth groove of the workpiece from the primary hobbing, the circumferential position of the workpiece can be locked, ensuring that the hob cutting position during the secondary hobbing is aligned with the tooth groove of the primary hobbing, thus avoiding the problem of misaligned teeth.

Description

Technical Field

[0001] The embodiments of this application relate to the field of gear hobbing technology, and more specifically, to a gear hobbing machine secondary gear hobbing clamp. Background Technology

[0002] In gear manufacturing in the automotive, wind power and other fields, gear hobbing is a key process for forming gear tooth profiles. For gears with complex structures (such as double gears) or high-precision gears, it is often necessary to process them in stages: such as rough hobbing to remove excess material, heat treatment and then fine hobbing, or changing the hob to process tooth profiles with different parameters. Therefore, secondary clamping (disassembling and re-clamping the workpiece after the first hobbing) has become a necessary operation. Existing secondary clamping is prone to tooth misalignment, which leads to the scrapping of the workpiece. Utility Model Content

[0003] To overcome the above-mentioned defects, this application provides a gear hobbing fixture for secondary gear hobbing, which solves the technical problem in the prior art that direct secondary hobbing after gear hobbing on a gear hobbing machine easily leads to tooth misalignment and scrap of the workpiece.

[0004] According to one aspect, at least one embodiment of this application provides a secondary gear hobbing clamp for a gear hobbing machine, comprising: a sleeve for fitting onto a center base, the center base having a center hole. The sleeve has a through hole for the workpiece to pass through. The sleeve is configured such that when it is fitted onto the center base, the through hole communicates with the center hole, so that the workpiece can pass through the through hole and extend into the center hole. The sleeve is also provided with a insertion hole, which is located on the periphery of the through hole; The positioning element has a rod for insertion into a socket and a positioning plate connected to the rod. The positioning plate has a positioning hole, and the inner peripheral wall of the positioning hole is provided with at least two positioning teeth. The positioning element is configured such that when the rod is inserted into the socket, the positioning teeth engage with the tooth grooves of the workpiece.

[0005] For example, in a gear hobbing machine secondary gear hobbing clamp provided in at least one embodiment of this application, a mounting groove is provided on the peripheral wall of the sleeve, and an axially penetrating mounting hole is provided on the side wall of the mounting groove. The mounting hole is used to align with the connecting hole on the top base, so that the fastener can pass through the mounting hole and the connecting hole to fix the sleeve on the top base.

[0006] For example, in a gear hobbing machine secondary gear hobbing fixture provided in at least one embodiment of this application, the mounting hole is an arc-shaped elongated hole.

[0007] For example, in a gear hobbing machine secondary gear hobbing clamp provided in at least one embodiment of this application, the mounting groove extends axially, and the axial length of the mounting groove can be greater than the axial length of the fastener used.

[0008] For example, in a gear hobbing machine secondary gear hobbing fixture provided in at least one embodiment of this application, the diameter of the through hole is configured to be equal to the diameter of the contact portion of the workpiece.

[0009] For example, in a gear hobbing machine secondary gear hobbing clamp provided in at least one embodiment of this application, the insertion hole is a through hole or a blind hole.

[0010] For example, in a gear hobbing machine secondary gear hobbing fixture provided in at least one embodiment of this application, there are multiple positioning teeth, and the multiple positioning teeth are equally spaced along the circumferential direction of the positioning hole on the inner circumferential wall of the positioning hole.

[0011] The beneficial effects of the embodiments of this application are as follows: In this application, the circumferential position of the workpiece can be locked by the positioning teeth on the positioning component that match the tooth groove of the workpiece during the first hobbing, ensuring that the cutting position of the hob during the second hobbing is aligned with the tooth groove of the first machining. At the same time, the through hole of the sleeve can be coaxial and connected with the center hole of the center base, ensuring the coaxiality and circumferential position accuracy of the workpiece with the inner and outer centers, avoiding tooth deviation or tooth misalignment. During operation, the position of the insertion hole can be adjusted by rotating the sleeve during the debugging stage. After determining the reference, it can be tightened. During subsequent batch processing, the rod of the positioning component only needs to be inserted into the fixed insertion hole, and the positioning can be quickly completed by the cooperation of the positioning teeth and the tooth groove of the workpiece, without the need for complex manual calibration, reducing the dependence on operating experience. Moreover, the sleeve can be fixed to the original center base of the hobbing machine with fasteners, without the need to modify the machine tool body. Replacing different positioning plates can also adapt to gears of various modules and numbers of teeth, with strong compatibility. In addition, precise positioning can avoid abnormal wear of the hob due to positional deviation, indirectly extending the tool life, while reducing the waste caused by workpiece scrap and reducing the overall production pressure. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this application. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this application and these drawings without any creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of a gear hobbing machine secondary gear hobbing clamp according to this application; Figure 2 for Figure 1 A schematic diagram of the positioning element in the embodiment; Figure 3 This is a schematic diagram of the positioning element in another embodiment; Figure 4 for Figure 1 The embodiment shows a schematic diagram of the sleeve structure.

[0014] In the diagram: 100, sleeve; 110, through hole; 120, insertion hole; 130, mounting groove; 140, mounting hole; 200, center base; 210, center hole; 300, positioning element; 310, rod; 320, positioning plate; 330, positioning hole; 340, positioning tooth; 400, workpiece; 500, fastener. Detailed Implementation

[0015] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the scope of the application.

[0016] To keep the drawings concise, only the parts relevant to the utility model are shown schematically in each drawing; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "a" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0017] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0018] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0019] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0020] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0021] like Figure 1 As shown, this application discloses a secondary hobbing fixture for a gear hobbing machine. In traditional gear hobbing processes, the workpiece 400 needs to undergo a first hobbing operation, followed by heat treatment such as quenching and tempering to improve its mechanical properties. A second hobbing operation is then required. However, direct secondary clamping can easily lead to "tooth misalignment" due to circumferential displacement of the workpiece 400, resulting in the scrapping of the workpiece 400. Simultaneously, hobbing accuracy and tool life must be considered. In this embodiment, the position of the workpiece 400 is adjusted using a sleeve 100 and a positioning element 300.

[0022] like Figure 1 As shown, in this embodiment, the sleeve 100 is used to be fitted onto the center base 200 of the gear hobbing machine. The center base 200 is an original component of the gear hobbing machine. Its function is to fix the installation position of the expansion sleeve, transmit the positioning reference and power of the machine tool, and provide guidance and limit for the expansion and contraction of the expansion sleeve, so as to ensure the fitting accuracy between the expansion sleeve, the inner center, and the workpiece 400. The inner center is used to cooperate with the outer center to press the workpiece 400 against both ends of the workpiece 400 in the axial direction.

[0023] like Figure 1 and Figure 4 As shown, a through hole 110 is provided at one end of the sleeve 100. The through hole 110 extends through the sleeve 100 along its axial direction, allowing the workpiece 400 to pass through. When the sleeve 100 is fitted onto the center base 200, the through hole 110 communicates with the center hole 210 (containing an inner center) of the center base 200, ensuring that the workpiece 400 can pass through the through hole 110 and extend into the center hole 210, thus ensuring the coaxiality of the workpiece 400 and the inner center. Preferably, the diameter of the through hole 110 is the same as the diameter of the workpiece 400 at the through hole 110 after it is inserted into the center hole 210. The sleeve 100 is of equal size; one end of the sleeve 100 with a through hole 110 is also provided with a plug hole 120. The plug hole 120 is located on the periphery of the through hole 110 and is used to insert the rod part 310 of the positioning member 300. The sleeve 100 has an axially oriented mounting groove 130 on its peripheral wall. The mounting groove 130 has an axially penetrating mounting hole 140 on its side wall. The mounting hole 140 is used to align with the pre-set connection hole of the center base 200 and to allow the fastener 500 to pass through to fix the sleeve 100 on the center base 200. The fastener 500 is usually a screw, bolt, etc.

[0024] like Figure 2 and Figure 3As shown, the positioning component 300 includes a rod portion 310 and a positioning plate 320 connected to the rod portion 310. The rod portion 310 is elongated (e.g., cylindrical) and its dimensions are adapted to the insertion hole 120 of the sleeve 100, allowing the positioning component 300 to be inserted into the insertion hole 120 to assemble the positioning component 300 with the sleeve 100. The positioning plate 320 is plate-shaped (e.g., circular or elongated), and a positioning hole 330 is provided on the positioning plate 320. The positioning hole 330 can be a blind hole or a through hole 110, through which the rod portion 310 is inserted into the insertion hole 120. After connection, the positioning hole 330 is coaxial with the through hole 110, so that one end of the workpiece 400 inserted in the through hole 110 can extend into the positioning hole 330. Positioning teeth 340 are provided on the inner peripheral wall of the positioning hole 330. At least two positioning teeth 340 are provided and can be evenly distributed along the circumference of the positioning hole 330. The shape and size of the positioning teeth 340 are adapted to the tooth groove formed by the one-time hobbing of the workpiece 400. The position of the workpiece 400 can be determined by the insertion of the positioning teeth 340 into the tooth groove of the workpiece 400.

[0025] Specifically, the tooth alignment process is as follows: First, sleeve 100 is fitted onto center base 200, and fastener 500 is used to secure sleeve 100 to center base 200. When machining workpiece 400, workpiece 400 is inserted into center hole 210 after passing through through hole 110, so that the end of workpiece 400 abuts against the inner center in center hole 210. The outer center is moved to cooperate with the inner center in abutting and fixing workpiece 400, thus performing the first gear hobbing on a batch of workpieces 400. The outer center is then moved to release the fixation of the reserved workpiece 400, allowing the machined workpiece 400 to be removed. The above steps are repeated to complete the gear hobbing of a batch of workpieces 400, leaving the last workpiece 400 after the first gear hobbing as a reserved workpiece 400 for adjusting the position of workpiece 400. The remaining... The workpiece 400 is heat-treated. The rod 310 of the positioning member 300 is aligned with the insertion hole 120 and inserted. The positioning hole 330 is aligned with the tooth of the reserved workpiece 400 after one hobbing. The positioning tooth 340 is inserted into the tooth groove of the reserved workpiece 400. If the positioning tooth 340 cannot be inserted, the fastener 500 between the sleeve 100 and the center base 200 is loosened, so that the sleeve 100 can rotate independently. At this time, the position of the reserved workpiece 400 remains unchanged. After the sleeve 100 rotates, the insertion hole 120 changes position accordingly, keeping the rod 310 inserted. This causes the position of the positioning hole 330 to change, thereby driving the positioning tooth 340 to adjust its position so that the positioning tooth 340 can be inserted into the tooth groove of the workpiece 400 after one hobbing.

[0026] Secondly, maintaining the insertion and engagement of the positioning tooth 340 with the tooth groove of the workpiece 400 and the insertion state of the rod 310 with the insertion hole 120, the sleeve 100 and the center base 200 are re-fixed using the fastener 500, thus fixing the position of the insertion hole 120. The positioning part 300 is removed, and the reserved workpiece 400 is removed. The heat-treated workpiece 400 is placed individually into the center hole 210. The rod 310 of the positioning part 300 is then re-inserted into the insertion hole 120, which has been adjusted. The positioning tooth 340 is then inserted with the tooth groove of the workpiece 400. If the insertion cannot be aligned, it indicates that the position of the workpiece 400 is off. The workpiece 400 can be rotated so that the positioning tooth 340 and the tooth groove of the workpiece 400 can be inserted and engaged, indicating that the position of the workpiece 400 is accurate.

[0027] Finally, remove the positioning part 300, move the outer center to abut one end of the workpiece 400, and perform a second gear hobbing on the workpiece 400.

[0028] In this embodiment, the positioning teeth 340 on the positioning member 300, which are adapted to the tooth grooves of the workpiece 400 during the first hobbing, can lock the circumferential position of the workpiece 400, ensuring that the hob cutting position is aligned with the tooth grooves processed in the first hobbing. At the same time, the through hole 110 of the sleeve 100 can be coaxial and connected with the center hole 210 of the center base 200, ensuring the coaxiality and circumferential position accuracy of the workpiece 400 with the inner and outer centers, and avoiding tooth deviation or tooth misalignment. During operation, the position of the insertion hole 120 can be adjusted by rotating the sleeve 100 during the debugging stage. After determining the reference, it can be tightened. In subsequent batch processing, the rod 310 of the positioning part 300 only needs to be inserted into the fixed insertion hole 120. The positioning teeth 340 and the tooth groove of the workpiece 400 are used to quickly complete the positioning without complicated manual calibration, reducing the dependence on operating experience. Moreover, the sleeve 100 can be fixed on the original center base 200 of the gear hobbing machine with the fastener 500 without modifying the main body of the machine tool. Replacing different positioning plates 320 can also adapt to gears with various modules and numbers of teeth, which has strong compatibility. In addition, precise positioning can avoid abnormal wear of the hob due to positional deviation, indirectly extending the tool life, while reducing the waste caused by the scrap of the workpiece 400 and reducing the overall production pressure.

[0029] Furthermore, such as Figure 1 and Figure 4 As shown, the conventional top base 200 is usually pre-set with a circular mounting hole 140. If the sleeve 100 rotates, it is easy to misalign with the circular threaded hole fixed in the base, making it impossible to fasten with the fastener 500. However, the elongated hole can provide a certain range of motion in the circumference. Even if the sleeve 100 rotates at a corresponding angle to adjust the position of the insertion hole 120, the extended area of ​​the elongated hole can still cover the circular threaded hole on the base, ensuring that the two always remain connected, without the need to process more threaded holes on the base.

[0030] Furthermore, such as Figure 1 and Figure 4 As shown, the mounting groove 130 is designed to extend axially and have an axial length greater than that of the fastener 500, while retaining a certain width. The core purpose is to reserve sufficient space for the disassembly and assembly of the fastener 500. Since the gap between the sleeve 100 and the top base 200 is limited after the sleeve 100 is fitted onto the top base 200, if the space in the mounting groove 130 is insufficient, the hand or tools (such as screwdrivers or wrenches) are easily blocked by the sleeve 100 wall or the base structure, making it difficult to stably contact the fastener 500. The axial length being greater than the length of the fastener 500 allows for sufficient axial movement of the fastener 500 during loosening or tightening, preventing the fastener 500 from being unable to be smoothly removed or screwed in due to the limitations at both ends of the mounting slot 130. At the same time, the width design of the mounting slot 130 can directly accommodate the tool head or human hand operation, ensuring that the tool can be accurately aligned with the fastener 500, reducing slippage or misalignment during operation. Whether it is loosening the fastener 500 to rotate the sleeve 100 during the debugging stage or tightening the fastener 500 again after adjustment, the operation can be completed more smoothly, avoiding difficulties in disassembly and assembly due to space constraints, and further improving the convenience of using the fixture.

[0031] Furthermore, configuring the diameter of the through hole 110 to be equal to the diameter of the contact portion with the workpiece 400 allows for a tight fit when the workpiece 400 passes through the through hole 110, restricting radial wobble of the workpiece 400 within the through hole 110. This ensures that the axis of the workpiece 400 coincides with the axis of the through hole 110, thereby maintaining coaxiality with the inner and outer centers within the center hole 210 on the center base 200. This prevents tooth direction deviation or tooth profile misalignment during secondary hobbing due to radial offset. Simultaneously, this tight fit provides stable radial support for the workpiece 400, reducing radial movement during machining and ensuring the stability of the cutting process. No additional radial limiting structure is required, simplifying the overall fixture design.

[0032] Furthermore, the insertion hole 120 can be designed as a through hole or a blind hole. If a blind hole is used, it can clearly limit the insertion depth of the rod 310 of the positioning member 300, and prevent the positioning plate 320 from shifting due to the rod 310 being inserted too deeply. If a through hole is used, it can accommodate rods 310 of different lengths without strictly limiting the length of the rod 310, thus improving the versatility of the positioning member 300.

[0033] Furthermore, multiple positioning teeth 340 are evenly spaced along the circumference of the positioning hole 330 on the inner circumferential wall of the positioning hole 330. They can simultaneously engage with the multiple tooth grooves formed by the first hobbing of the workpiece 400 to construct a multi-point positioning structure, avoiding the circumferential offset that is easy to occur in single-point positioning, making the circumferential position of the workpiece 400 more accurately locked, and ensuring that the hob cutting phase is completely aligned with the first machining during the second hobbing.

[0034] It should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the spirit and scope of the technical solutions of this application, and all such modifications and substitutions should be covered within the scope of the claims of this application.

Claims

1. A gear hobbing machine secondary gear hobbing clamp, characterized in that, include: A sleeve (100) is used to fit onto a center base (200), the center base (200) having a center hole (210). The sleeve (100) has a through hole (110) for the workpiece (400) to pass through. The sleeve (100) is configured such that when it is fitted onto the center base (200), the through hole (110) communicates with the center hole (210) so that the workpiece (400) can pass through the through hole (110) and extend into the center hole (210). The sleeve (100) is also provided with a plug hole (120), which is located on the periphery of the through hole (110); A positioning member (300) has a rod portion (310) for insertion into the insertion hole (120) and a positioning plate (320) connected to the rod portion (310). The positioning plate (320) has a positioning hole (330), and the inner peripheral wall of the positioning hole (330) is provided with at least two positioning teeth (340). The positioning member (300) is configured such that when the rod portion (310) is inserted into the insertion hole (120), the positioning teeth (340) engage with the tooth grooves of the workpiece (400).

2. The gear hobbing machine secondary gear hobbing clamp according to claim 1, characterized in that, The sleeve (100) has a mounting groove (130) on its peripheral wall, and the mounting groove (130) has an axially penetrating mounting hole (140) on its side wall. The mounting hole (140) is used to align with the connecting hole on the top base (200), so that the fastener (500) can pass through the mounting hole (140) and the connecting hole to fix the sleeve (100) on the top base (200).

3. The gear hobbing machine secondary gear hobbing clamp according to claim 2, characterized in that, The mounting hole (140) is an arc-shaped elongated hole.

4. The gear hobbing machine secondary gear hobbing clamp according to claim 2, characterized in that, The mounting groove (130) extends axially, and the axial length of the mounting groove (130) can be greater than the axial length of the fastener (500) used.

5. A gear hobbing machine secondary gear hobbing clamp according to claim 1, characterized in that, The diameter of the through hole (110) is configured to be equal to the diameter of the contact portion of the workpiece (400).

6. A gear hobbing machine secondary gear hobbing clamp according to claim 1, characterized in that, The insertion hole (120) is a through hole or a blind hole.

7. A gear hobbing machine secondary gear hobbing clamp according to claim 1, characterized in that, The number of positioning teeth (340) is multiple, and the multiple positioning teeth (340) are equally spaced along the circumference of the positioning hole (330) on the inner circumferential wall of the positioning hole (330).

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