Positioning tool for hobbing of disc gear

Abstract

The utility model belongs to the technical field of workpiece clamping devices, and relates to a positioning tool for hobbing disc gears, which comprises a base, a pull rod, a positioning tray and an elastic expansion sleeve capable of expanding outwards, the positioning tray is arranged on the base, an outer cone is further arranged on the base, the elastic expansion sleeve is provided with an inverted-cone-shaped inner hole, and the outer cone is arranged in the inverted-cone-shaped inner hole. The outer cone is sleeved with the elastic expansion sleeve, the top of the pull rod is connected with the elastic expansion sleeve, and the bottom of the pull rod penetrates through the base; a plurality of positioning claws are evenly distributed on the positioning tray in the circumferential direction, and blade teeth are arranged on the upper end faces of the positioning claws. The positioning tray is used for supporting a workpiece, the elastic expansion sleeve can expand outwards to position the workpiece when the pull rod is pulled downwards through the cooperation of the inverted-cone-shaped inner hole of the elastic expansion sleeve and the outer cone, blade teeth on the positioning claw can be embedded into the lower end face of the workpiece, the clamping force of the workpiece is increased, and the stability of the workpiece in the machining process is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of positioning tool for disc gear hobbing, belong to workpiece clamping device technical field. BACKGROUND

[0002] In the field of mechanical processing, gear hobbing process is an important method in gear manufacturing, widely used in automobile, aerospace, engineering machinery and many other industries. The design of traditional hobbing fixture mainly relies on the inner hole expansion mechanism to provide the necessary clamping force to ensure the stability and accuracy of the gear during hobbing. This clamping method shows good applicability and efficiency in conventional gear machining, but when applied to the machining of new energy vehicle transmission gears, there are some problems:

[0003] First, compared with traditional automobile gears, new energy vehicle transmission gears often have smaller inner hole size in design. This change directly affects the clamping performance of the hobbing fixture, because the clamping force provided by the inner hole expansion mechanism decreases significantly with the decrease of the inner hole size. Insufficient clamping force can cause the gear to displace or vibrate during hobbing, which affects the machining accuracy and surface quality of the gear.

[0004] In addition, in order to meet the needs of high efficiency transmission and light weight, the pitch diameter of new energy vehicle transmission gears is often large, increasing the risk of deformation of the gear during machining.

[0005] In order to ensure the machining quality, when clamping the gear with traditional hobbing fixture, only slow feed and slow speed machining method can be adopted to reduce cutting force and control machining deformation. However, this machining method can ensure the machining quality to a certain extent, but it significantly reduces the machining efficiency and increases the production cost. And when the hob wears out, the hobbing cutting force increases, and the clamping force of the fixture is insufficient, the workpiece relative to the fixture displacement is prone to quality problems such as tooth spiral angle and cumulative gear tolerance. Large displacement will cause tool chipping and even damage the equipment. INVENTION CONTENTS

[0006] The purpose of the utility model is to provide a new technical solution to improve or solve the technical problems existing in the prior art as described above.

[0007] The technical solution provided by the utility model is as follows:

[0008] The utility model provides a positioning tool for disc gear hobbing, including base, pull rod, positioning tray and the elastic expansion sleeve that can expand outward, the positioning tray sets up on the base, still be equipped with outer cone on the base, the elastic expansion sleeve is equipped with inverted cone inner hole, the elastic expansion sleeve sets up on the outer cone, the top of pull rod is connected with the elastic expansion sleeve, and the bottom of pull rod penetrates the base, a plurality of positioning claws are uniformly distributed on the positioning tray along the circumference, and the upper end surface of positioning claw is equipped with blade tooth.

[0009] Compared with the prior art, the technical scheme provided by the utility model has the following beneficial effects:

[0010] The utility model discloses a positioning tray firmly holds the workpiece of processing first, and simultaneously, the elastic expansion sleeve utilizes the cooperation of inverted cone inner hole and outer cone, when the pull rod is pulled down, the elastic expansion sleeve can expand outward evenly and stably, so that the elastic expansion sleeve can closely adhere and firmly fix the inner hole of workpiece, when the workpiece is placed on the positioning tray, the lower end surface will contact the blade tooth on the positioning claw, and the blade tooth on the positioning claw will be embedded in the lower end surface of workpiece, so that the clamping force of workpiece is increased, and the stability of workpiece in the processing process is ensured, and the blade tooth is embedded in the non-functional end surface, so that the normal use of workpiece is not affected.

[0011] Further, a plurality of mounting grooves are uniformly distributed on the positioning tray along the axial direction, and the positioning claws are installed in the mounting grooves.

[0012] The beneficial effect of the above further scheme is that the positioning claws are installed through the mounting grooves, which not only facilitates positioning and installation, but also reduces the possibility of workpiece deviation and shaking.

[0013] Further, the utility model also includes an adjusting gasket installed between the positioning claw and the mounting groove for adjusting the height of the positioning claw.

[0014] The beneficial effect of the above further scheme is that the height of the positioning claw can be flexibly adjusted through the adjusting gasket to adapt to workpieces of different thicknesses or different processing requirements.

[0015] Further, the height of the blade tooth is 0.02mm-0.03mm higher than the upper end surface of the positioning tray.

[0016] The beneficial effect of the above further scheme is that this small height difference design ensures that the blade tooth can slightly embed into the surface of the workpiece when the workpiece is clamped, thereby increasing the clamping force and preventing the workpiece from sliding or moving during processing. The small height difference of the blade tooth not only ensures the reliability of workpiece clamping, but also avoids embedding too deeply to damage the workpiece, ensuring the processing quality and the integrity of the workpiece surface.

[0017] Further, a pressing cap is arranged above the workpiece to be processed.

[0018] The pressing cap and the positioning tray jointly act on the workpiece in the axial direction, thereby achieving stable fixation of the workpiece in the axial direction.

[0019] Further, a plurality of pressing protrusions are arranged on the lower pressing surface of the pressing cap in the circumferential direction.

[0020] The pressing protrusions can increase the friction force of the pressing cap after pressing the workpiece.

[0021] Further, a handle is arranged above the pressing cap, and a flange is arranged on the handle.

[0022] The handle is convenient to connect with the driving mechanism, thereby achieving automation of the pressing process.

[0023] Further, a U-shaped ring groove is arranged on the outer circle of the pull rod, and the elastic sleeve is provided with a U-shaped ring hole shoulder matched with the U-shaped ring groove.

[0024] Further, a center installation hole is arranged on the positioning tray, and a limiting column matched with the center installation hole is arranged on the base.

[0025] Further, a driving mechanism is arranged, and the driving mechanism is drivingly connected with the pull rod.

[0026] The driving mechanism drives the up-and-down movement of the pull rod, thereby achieving automatic control of the elastic sleeve and accurate adjustment of the clamping force. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of the provided drawings.

[0028] Figure 1 Fig. 1 is a schematic view of the three-dimensional structure of the positioning tool of the present application;

[0029] Figure 2 is a front view of the positioning tool of the utility model;

[0030] Figure 3 is a front view of the positioning tool of the utility model; Figure 2 is a B-B cross-sectional view of the positioning tool of the utility model;

[0031] Figure 4 is a structural schematic view of the base of the utility model;

[0032] Figure 5 is a structural schematic view of the positioning tray of the utility model provided with a plurality of mounting grooves;

[0033] Figure 6 is a structural schematic view of the pull rod and the elastic expansion sleeve connection of the utility model;

[0034] Figure 7 is a structural schematic view of the gland of the utility model;

[0035] Figure 8 is an exploded structural schematic view of the positioning tool in use of the utility model;

[0036] Figure 9 is a front view of the positioning tool in use of the utility model;

[0037] Figure 10 is a B-B cross-sectional view of the positioning tool of the utility model; Figure 9 is an A-A cross-sectional view of the positioning tool of the utility model;

[0038] In the figure, 1, base; 11, outer cone; 12, limiting column; 2, pull rod; 21, U-shaped ring groove; 3, positioning tray; 31, center mounting hole; 4, elastic expansion sleeve; 41, inverted conical inner hole; 42, U-shaped ring hole shoulder; 5, positioning claw; 51, blade tooth; 6, mounting groove; 7, adjusting gasket; 8, gland; 81, handle part; 82, flange plate; 83, lower pressing protruding part; 9, disc gear. DETAILED DESCRIPTION

[0039] The serial numbers coded for components in this document, such as "first", "second", etc., are only used to distinguish the described objects, and do not imply any priority in sequence or specific technical meaning. In addition, the "connection" and "coupling" concepts mentioned in this application are considered to include both direct connection (coupling) and indirect connection (coupling) unless otherwise specified.

[0040] When interpreting the description of this application, it should be clarified that terms such as "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating directions or positional relationships, are based on the perspective and layout shown in the accompanying drawings. They are intended to facilitate explanation and simplify the description process, and are not absolute limitations on the actual location, construction method, or operating mode of the described device or element. Therefore, these terms should not be construed as restrictive interpretations of the content of this application.

[0041] The principles and features of this utility model are described below with reference to examples. The examples are only used to explain this utility model and are not intended to limit the scope of this utility model.

[0042] like Figure 1 - Figure 7 As shown, a positioning fixture for hobbing disc gears includes a base 1, a pull rod 2, a positioning tray 3, and an outwardly expanding elastic sleeve 4. The positioning tray 3 has a central mounting hole 31, and the base 1 has a limiting post 12 that mates with the central mounting hole 31. The positioning tray 3 is mounted on the base 1 by the limiting post 12. The base 1 also has an outer cone 11, which is located above the limiting post 12. The elastic sleeve 4 has an inverted conical inner hole 41 and is fitted onto the outer cone 11. The pull rod 2 has a U-shaped annular groove 21 on its top outer surface, and the elastic sleeve 4 has a groove that mates with the U-shaped annular groove. The U-shaped ring shoulder 42 of the 21-type fitting is used to connect the pull rod 2 and the elastic expansion sleeve 4 together through the U-shaped ring groove 21 and the U-shaped ring shoulder 42. The base 1 is provided with a through hole, and the bottom of the pull rod 2 passes through the through hole through the base 1. The positioning tray 3 is provided with a plurality of positioning claws 5 evenly distributed around the circumference. The upper end face of the positioning claw 5 is provided with a cutting tooth 51. At the same time, the positioning tray 3 is provided with a plurality of mounting grooves 6 evenly distributed around the axial direction. The mounting grooves 6 are provided with bolt mounting holes. The positioning claw 5 is provided with a matching bolt countersunk through hole. The adjusting shim 7 is provided with a matching bolt through hole. The positioning claw 5 and the adjusting shim 7 are installed in the mounting groove 6 by bolts.

[0043] The cutting teeth 51 are 0.02mm-0.03mm higher than the upper surface of the positioning tray 3 to ensure that the cutting teeth 51 can slightly embed into the surface of the workpiece to be processed, thereby enhancing the clamping effect. The height of the cutting teeth 51 on the positioning claw 5 can also be finely adjusted by adjusting the shims 7 to meet the processing requirements of different workpieces. More specifically, if the depth of the mounting groove 6 is h1, the thickness of the positioning claw 5 is h2, and the thickness of the adjusting shims 7 is h3, then the height of the cutting teeth 51 above the upper surface of the positioning tray 3 is h = h2 + h3 - h1, and the value range of h is: 0.02mm < h ≤ 0.04mm.

[0044] The positioning tool further comprises a pressing cap 8, an upper end of the pressing cap 8 is provided with a handle 81, and a flange plate 82 is arranged on the handle 81 and used for being connected with a driving mechanism; the driving mechanism drives the pressing cap 8 to press the workpiece on the positioning tray 3 from the upper end of the workpiece to be machined.

[0045] The positioning tool further comprises a driving mechanism, and the driving mechanism is in driving connection with the pull rod 2.

[0046] As shown in Figures 8-10 The working method of the positioning tool for hobbing the disc gear 9 is as follows:

[0047] Firstly, the disc gear 9 to be machined is placed above the positioning tray 3, the elastic sleeve 4 is located in the inner hole of the disc gear 9, the positioning pressing cap 8 is driven to descend by the driving mechanism, and the disc gear 9 to be machined is tightly pressed on the upper end face of the disc gear 9 to be machined. In this process, the blade teeth 51 on the positioning claw 5 are slightly embedded in the lower end face of the gear, the workpiece does not produce displacement in the radial direction relative to the clamp, and the embedded position of the blade teeth 51 is selected on the non-functional end face, so as to avoid any influence on the normal use of the workpiece. The pull rod 2 is pulled downward, the pull rod 2 pulls the elastic sleeve 4 to move downward, the taper surface of the outer cone body 11 makes the elastic sleeve 4 expand radially outward, and the workpiece is fixed firmly with the tight fitting of the outer side surface of the elastic sleeve 4 and the inner hole of the workpiece.

[0048] The positioning tool can firstly stably hold the workpiece to be machined by the positioning tray 3, the pressing cap 8 and the positioning tray 3 jointly act on the workpiece in the axial direction, and the stable fixation of the workpiece in the axial direction is realized. Meanwhile, the pressing cap 8 can embed the blade teeth 51 of the positioning claw 5 into the non-machining face of the workpiece, and the workpiece is positioned in the circumferential direction and the radial direction; the whole tooling can accurately and stably position the workpiece in multiple directions, the quality problems such as tooth spiral angle and cumulative tolerance of the gear caused by displacement are solved, the clamping force is increased by embedding the blade into the workpiece, the cutting force of the tool can be increased, the machining tool speed and the feed amount can be increased, the machining efficiency is improved, and the cost is reduced.

[0049] The above only describes the preferred embodiments of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A positioning tool for disk-type gear hobbing, characterized by, It includes base (1), pull rod (2), positioning tray (3) and elastic expansion sleeve (4) which can expand outwardly, positioning tray (3) is arranged on base (1), outer cone (11) is also arranged on base (1), elastic expansion sleeve (4) is provided with inverted cone-shaped inner hole (41), elastic expansion sleeve (4) is sleeved on outer cone (11), top of pull rod (2) is connected with elastic expansion sleeve (4), bottom of pull rod (2) penetrates base (1), positioning tray (3) is uniformly distributed with a plurality of positioning claws (5) along the circumference, upper end surface of positioning claw (5) is provided with blade tooth (51).

2. The positioning tool for disk gear hobbing according to claim 1, wherein Positioning tray (3) is uniformly distributed with a plurality of installation grooves (6) along the axial direction, positioning claw (5) is installed in installation groove (6).

3. The positioning tool for disk gear hobbing according to claim 2, wherein It also includes adjusting gasket (7), adjusting gasket (7) is installed between positioning claw (5) and installation groove (6) for adjusting the height of positioning claw (5).

4. The positioning tool for disk gear hobbing as claimed in any one of claims 1 to 3, wherein The height of blade tooth (51) is higher than the upper end surface of positioning tray (3) by 0.02mm-0.03mm.

5. The positioning tool for disk type gear hobbing according to claim 1, wherein It also includes gland (8) for pressing the workpiece to be processed from above.

6. The positioning tool for disk type gear hobbing according to claim 5, wherein Lower pressing surface of gland (8) is provided with a plurality of lower pressing protrusions (83) along the circumference.

7. The positioning tool for disk-type gear hobbing according to claim 5 or 6, characterized in that, Upper side of gland (8) is provided with handle part (81), flange plate (82) is arranged on handle part (81).

8. The positioning tool for disk type gear hobbing according to claim 1, wherein U-shaped ring groove (21) is arranged on the outer circle of pull rod (2), U-shaped ring hole shoulder (42) is arranged on elastic expansion sleeve (4) and matched with U-shaped ring groove (21), pull rod (2) and elastic expansion sleeve (4) are connected together through the cooperation of U-shaped ring groove (21) and U-shaped ring hole shoulder (42).

9. The positioning tool for disk type gear hobbing according to claim 1, wherein Center installation hole (31) is arranged on positioning tray (3), and limiting column (12) matched with center installation hole (31) is arranged on base (1).

10. The positioning tool for disk type gear hobbing according to claim 1, wherein It also includes driving mechanism, driving mechanism is drivingly connected with pull rod (2).

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