Hobbing and grinding tool clamp

Abstract

The utility model provides a gear hobbing and grinding work fixture which comprises a base, a gear hobbing assembly and a gear grinding assembly. The positioning mandrel is arranged on the base and is detachably connected with the base; the guide sleeve is connected to the positioning mandrel in a sleeving mode, a plurality of rotatable guide balls are arranged on the side wall of the guide sleeve, the inner sides of the guide balls abut against the positioning mandrel, and the outer sides of the guide balls are configured to abut against inner holes of gear workpieces; the pressing plate is sleeved on the positioning mandrel; and the first fastener is connected with the upper end of the positioning mandrel and fixes the gear workpiece. According to the utility model, the positioning mandrel is abutted against the gear workpiece through the rotatable guide ball, so that the gear workpiece does not generate radial deviation in the machining process of the gear hobbing machine, the rejection rate of the gear workpiece is further reduced, and the positioning mandrel can be conveniently assembled and disassembled with a gear grinding machine or the gear hobbing machine.

Description

Technical Field

[0001] The utility model relates to the technical field of gear processing, in particular to a gear hobbing and gear grinding fixture. Background Art

[0002] Gears are widely used transmission parts, used to transmit power and motion, and have the function of changing speed and direction. Common gear processing includes gear hobbing and gear grinding. Gear hobbing machine consists of gear hobbing mechanism and workbench. Gear grinding machine consists of grinding wheel and workbench. The workbench is equipped with a fixture, which is used to clamp and fix the gear workpiece to be processed.

[0003] In the prior art, for some gears with heavy weight (more than 300kg) and small order quantity, the fixture on the gear hobbing machine cannot locate the inner hole of the gear workpiece due to the small outer diameter of the positioning mandrel. It is necessary to clamp the gear workpiece with the pressure plates and base at the upper and lower ends of the gear workpiece, and then rotate the gear workpiece, and use the lever dial gauge to calibrate the gear side so that the trajectory of the outer side of the gear workpiece forms a standard circle. The positioning mandrel of the fixture on the gear grinding machine is directly in contact with the inner hole of the gear workpiece for positioning.

[0004] In the process of realizing the utility model, the inventor found that there are at least the following problems in the prior art: the inner hole of the gear is not positioned during the hobbing process, which easily causes the gear workpiece to shift, resulting in a high scrap rate. The contact surface between the positioning mandrel of the gear grinding machine fixture and the inner hole of the gear workpiece is large, and the gear workpiece is not easy to disassemble and assemble due to the influence of cylindricity. Utility Model Content

[0005] The utility model aims to solve one of the technical problems in the related art at least to a certain extent.

[0006] Therefore, the purpose of the utility model is to provide a gear hobbing and gear grinding fixture which can not only firmly fix the gear workpiece on the gear hobbing machine, but also can be conveniently disassembled and assembled with the gear grinding machine.

[0007] In order to achieve the above-mentioned purpose, the utility model provides a gear hobbing and gear grinding fixture, comprising:

[0008] Base;

[0009] A positioning mandrel, disposed on the base and detachably connected to the base;

[0010] A guide sleeve, sleeved on the positioning mandrel, a plurality of rotatable guide balls are arranged on the side wall of the guide sleeve, the inner side of the guide balls abuts against the positioning mandrel, and the outer side of the guide balls is configured to abut against the inner hole of the gear workpiece;

[0011] A pressing plate, sleeved on the positioning mandrel;

[0012] The first fastener is connected to the upper end of the positioning mandrel to fix the gear workpiece.

[0013] According to the gear hobbing and gear grinding fixture of the utility model, since the guide sleeve is sleeved on the positioning mandrel, the inner side of the guide ball abuts against the positioning mandrel, and the outer side of the guide ball can abut against the inner hole of the gear workpiece, therefore, the positioning mandrel abuts against the gear workpiece through the guide ball, and the gear workpiece will not produce radial deviation during the gear hobbing process, thereby reducing the scrap rate of the gear workpiece. The guide ball of the utility model is rotatable, so when the gear workpiece is clamped or removed, the inner hole of the gear workpiece will not form sliding friction with the positioning mandrel, but will form rolling friction, greatly reducing the friction between the two, so it is more convenient to complete the disassembly and assembly with the gear grinding machine or gear hobbing machine.

[0014] According to one embodiment of the utility model, the base comprises:

[0015] A base body, the overall shape of the base body is a truncated cone, and an inner hole is provided in the middle of the base body;

[0016] The bottom plate is integrally connected with the base body, and a plurality of waist-shaped holes are arranged at the edge of the bottom plate.

[0017] According to one embodiment of the utility model, it also includes a second fastener, and the positioning spindle includes, from top to bottom, an integrally formed first connecting portion, a positioning portion, a supporting portion, and a second connecting portion, the top end of the first connecting portion has a top hole, the positioning portion abuts against the guide sleeve, the top surface of the supporting portion is used to support the gear workpiece, and the second connecting portion extends into the base and is connected to the second fastener.

[0018] According to an embodiment of the utility model, the guide sleeve comprises a sleeve body, a plurality of positioning through holes are formed on the sleeve body, and one of the guide balls is placed in each positioning through hole.

[0019] According to an embodiment of the utility model, a hollow portion is provided at the bottom of the pressing plate, and the depth of the hollow portion gradually increases from the edge to the center.

[0020] According to an embodiment of the present invention, the base is made of ductile iron.

[0021] According to an embodiment of the utility model, the inner hole is a tapered hole.

[0022] According to an embodiment of the present utility model, the support portion is cylindrical as a whole, and the outer diameter of the support portion is larger than the outer diameter of the upper end surface of the base.

[0023] According to an embodiment of the utility model, a through hole is provided in the middle of the pressing plate, and the outer diameter of the through hole is matched with the inner diameter of the first connecting part.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description and in part will become apparent from the following description or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Various other advantages and benefits will become apparent to those skilled in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only used for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. In addition, the same reference symbols are used throughout the accompanying drawings to represent the same components. Among them:

[0026] Figure 1 The utility model is a schematic structural diagram of a gear hobbing and gear grinding fixture provided in one embodiment.

[0027] Figure 2 The utility model is a schematic structural diagram of a gear hobbing and grinding fixture and a gear workpiece proposed in one embodiment.

[0028] Figure 3 It is a cross-sectional view of a gear hobbing and gear grinding fixture and a gear workpiece proposed in one embodiment of the utility model.

[0029] Figure 4 The utility model is a schematic diagram of the exploded structure of a gear hobbing and gear grinding fixture and a gear workpiece proposed in one embodiment.

[0030] Figure 5 The utility model is a schematic structural diagram of a guide sleeve of a gear hobbing and gear grinding fixture according to an embodiment of the utility model.

[0031] Figure 6 The utility model is a schematic structural diagram of a positioning mandrel of a gear hobbing and gear grinding fixture according to an embodiment of the utility model.

[0032] Description of reference numerals:

[0033] 1-pressing plate, 2-first fastener, 3-positioning mandrel, 4-second fastener, 5-base, 6-guide sleeve, 11-hollowing portion, 31-positioning portion, 32-support portion, 33-first connecting portion, 34-second connecting portion, 35-top hole, 51-bottom plate, 52-base body, 53-inner hole, 61-sleeve body, 62-guide ball, 200-gear workpiece, 511-waist-shaped hole. DETAILED DESCRIPTION

[0034] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. On the contrary, the embodiments of the present invention include all changes, modifications and equivalents that fall within the spirit and connotation of the appended claims.

[0035] Combination Figures 1 to 6 As shown, the embodiment of the utility model provides a gear hobbing and gear grinding fixture. The fixture can be installed on both a gear hobbing machine and a gear grinding machine to achieve universality. The fixture includes a base 5, a positioning mandrel 3, a guide sleeve 6 and a pressing plate 1.

[0036] The base 5 mainly plays a supporting role, and is used to support the positioning mandrel 3, the guide sleeve 6, the pressing plate 1 and the gear workpiece 200 to be processed. The gear hobbing machine and the gear grinding machine have their own workbenches, and the base 5 can be detachably connected to the workbench through fasteners.

[0037] The positioning mandrel 3 is arranged on the base 5 and is detachably connected to the base 5. The positioning mandrel and the base in the prior art are integrated and made of mold steel, which has a high manufacturing cost. In this embodiment, the positioning mandrel 3 and the base 5 are designed separately. When the size of the gear workpiece 200 to be processed is changed, the tooling fixture is not suitable, and only the positioning mandrel 3 needs to be replaced, thereby reducing the manufacturing cost. The connection method between the positioning mandrel 3 and the base 5 can be threaded connection, pin connection, etc.

[0038] The guide sleeve 6 is sleeved on the positioning mandrel 3. A plurality of rotatable guide balls 62 are provided on the side wall of the guide sleeve 6. The inner side of the guide balls 62 abuts against the positioning mandrel 3, and the outer side of the guide balls 62 is configured to abut against the inner hole of the gear workpiece 200. When the gear workpiece 200 is clamped or disassembled, the guide balls 62 rotate.

[0039] The pressing plate 1 is sleeved on the positioning mandrel 3. The pressing plate 1 presses down the gear workpiece 200. The first fastener 2 is connected to the upper end of the positioning mandrel 3. After the first fastener 2 is locked, the pressing plate 1 and the gear workpiece 200 are clamped, and the gear workpiece 200 is fixed.

[0040] According to the gear hobbing and gear grinding fixture of the embodiment of the utility model, since the guide sleeve is sleeved on the positioning mandrel, the inner side of the guide ball abuts against the positioning mandrel, and the outer side of the guide ball can abut against the inner hole of the gear workpiece, therefore, the positioning mandrel abuts against the gear workpiece through the guide ball, and the gear workpiece will not produce radial deviation during the gear hobbing process, thereby reducing the scrap rate of the gear workpiece. The guide ball of the embodiment of the utility model is rotatable, so when the gear workpiece is clamped or removed, the inner hole of the gear workpiece will not form sliding friction with the positioning mandrel, but will form rolling friction, greatly reducing the friction between the two, so it is more convenient to complete the disassembly and assembly with the gear grinding machine or gear hobbing machine.

[0041] Combination Figure 2 , Figure 3 As shown, in some embodiments, the base 5 includes a base body 52 and a bottom plate 51. The overall shape of the base body 52 is a truncated cone. The upper and lower end surfaces of the base body 52 are both circular. Compared with the cylindrical base in the prior art, the truncated cone-shaped base body in this embodiment occupies less space under the condition of equal bottom area and equal height, and can save the materials required for manufacturing. An inner hole 53 is provided in the middle of the base body 52 to further reduce the manufacturing materials. The shape of the inner hole 53 is designed according to actual needs. Exemplarily, the inner hole 53 is a conical hole, which is adapted to the shape of the base body. The size of the base body 52 is flexibly set according to actual conditions. The bottom plate 51 is provided at the bottom of the base body 52, and the bottom plate 51 is integrally connected to the base body 52. ​​The shape of the bottom plate 51 is set according to actual needs. Exemplarily, the bottom plate 51 is annular, protruding radially outward from the outside of the base body 52, and a plurality of waist-shaped holes 511 are provided at the edge of the bottom plate 51. The waist-shaped hole 511 has an opening, and is connected to the machine tool worktable by a fastener passing through the waist-shaped hole 511. The advantage of the waist-shaped hole over the round hole is that there is no stop between the fixture and the machine tool worktable, which is convenient for adjusting the radial offset of the fixture, so that one base can be adapted to a variety of gear workpieces.

[0042] In some embodiments, the gear hobbing and gear grinding fixture further includes a second fastener 4, and the positioning mandrel 3 includes an integrally formed first connecting portion 33, a positioning portion 31, a supporting portion 32, and a second connecting portion 34 in order from top to bottom. The top of the first connecting portion 33 has a top hole 35, the positioning portion 31 abuts against the guide sleeve 6, the top surface of the supporting portion 32 is used to support the gear workpiece 200, and the second connecting portion 34 extends into the base 5 and is connected to the second fastener 4. The top hole 35 is used to cooperate with the top on the gear grinding machine or gear hobbing machine, so that the gear workpiece 200 does not jump during the processing. Optionally, the first fastener 2 and the second fastener 4 are both nuts.

[0043] The support portion 32 is cylindrical as a whole, and the outer diameter of the support portion 32 is larger than the outer diameter of the upper end surface of the base 5. The height and outer diameter of the support portion 32 are flexibly set as needed. Exemplarily, the outer diameter of the support portion 32 is smaller than the outer diameter of the gear workpiece 200 to avoid interference with the machining tool. The positioning portion 31 is cylindrical as a whole, and the size of the positioning portion 31 is designed according to the inner diameter of the inner hole of the gear workpiece 200. The first connecting portion 33 and the second connecting portion 34 are provided with external threads for fixing with fasteners. A through hole is provided in the middle of the pressure plate 1, and the outer diameter of the through hole is adapted to the inner diameter of the first connecting portion 33.

[0044] The inventor has found through research that if the pressing plate 1 adopts a cylindrical shape, the pressing plate 1 is easy to bend and deform in the axial direction during the machining process, and the actual pressure on the gear workpiece is not large enough, and it is easy to slip. For this reason, in one example, a hollow portion 11 is provided at the bottom of the pressing plate 1, and the depth of the hollow portion 11 gradually increases from the edge to the center. In other words, a conical groove is provided at the bottom of the pressing plate 1, so that the pressure is decomposed toward the edge of the gear workpiece when the first fastener 2 is pressed, so that the gear workpiece 200 is pressed more firmly, and the pressing plate 1 is not easy to deform.

[0045] In addition, the base 5 is made of ductile iron, and the base 5 blank is made by a method of wooden mold casting and then tempering, which reduces the production cost. Compared with the base made of mold steel, the base made of ductile iron has the advantage of less elastic deformation under stress, which is conducive to improving the processing accuracy and the deformation is also small after long-term use.

[0046] In some embodiments, in combination Figure 3 , Figure 6 As shown, the guide sleeve 6 includes a sleeve body 61, and a plurality of positioning through holes are formed on the sleeve body 61, and a guide ball 62 is placed in each positioning through hole. The guide ball can be made of a steel ball, which cannot be loosened after installation and the diameter of the guide ball must be greater than the thickness of the sleeve body 61. The diameters of the guide balls 62 on the same guide sleeve are consistent, and the sum of the diameters of the two guide balls is equal to the diameter of the inner hole of the gear workpiece minus the diameter of the positioning portion 31 of the positioning mandrel 3. In actual use, in order to ensure that the radial runout of the gear workpiece is qualified, the outer diameter of the positioning portion 31 is equal to the minimum limit size of the inner hole of the gear workpiece 200 minus the diameter of the guide ball and then minus 0.003mm to 0.006mm, and the positioning effect is better.

[0047] The method of using the gear hobbing and gear grinding fixture based on the above embodiment is as follows:

[0048] S1, select a qualified positioning mandrel 3, and fix the positioning mandrel 3 and the base 5 to form a fixture by using a second fastener 4;

[0049] S2, pre-connect the fixture to the gear hobbing machine workbench through the three waist-shaped holes 511. At this time, just tighten the nut that fastens the fixture;

[0050] S3, press the center on the machine tool down and press it into the center hole of the positioning mandrel;

[0051] S4, rotate the workbench, use a micrometer to check the radial runout of the positioning mandrel, and tighten the nut that fastens the fixture;

[0052] S5, lift the top and place the guide sleeve 6 onto the positioning mandrel;

[0053] S6, install the gear workpiece 200 on the guide sleeve and slide it into the guide sleeve;

[0054] S7, cover the pressing plate 1 and use the second fastener 4 to lock the gear workpiece 200 and then start the processing program.

[0055] It should be noted that, in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0056] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0058] In the description of the present invention, the directions or positional relationships indicated by the terms "left", "right", "front", "rear", etc. are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0059] Any process or method description in the flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present invention belong.

[0060] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0061] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A gear hobbing and gear grinding fixture, characterized in that: include: Base (5); A positioning mandrel (3) is disposed on the base (5) and is detachably connected to the base (5); A guide sleeve (6) is sleeved on the positioning core shaft (3), and a plurality of rotatable guide balls (62) are provided on the side wall of the guide sleeve (6), the inner side of the guide balls (62) abuts against the positioning core shaft (3), and the outer side of the guide balls (62) is configured to abut against the inner hole of the gear workpiece (200); A pressing plate (1) sleeved on the positioning mandrel (3); The first fastener (2) is connected to the upper end of the positioning mandrel (3) to fix the gear workpiece (200).

2. The gear hobbing and gear grinding fixture according to claim 1, characterized in that: The base (5) comprises: A base body (52), wherein the overall shape of the base body (52) is a truncated cone, and an inner hole (53) is provided in the middle of the base body (52); The bottom plate (51) is integrally connected to the base body (52), and a plurality of waist-shaped holes (511) are provided at the edge of the bottom plate (51).

3. The gear hobbing and gear grinding fixture according to claim 1, characterized in that: The invention also comprises a second fastener (4). The positioning spindle (3) comprises, from top to bottom, an integrally formed first connecting portion (33), a positioning portion (31), a supporting portion (32) and a second connecting portion (34). The top end of the first connecting portion (33) has a top hole (35). The positioning portion (31) abuts against the guide sleeve (6). The top surface of the supporting portion (32) is used to support the gear workpiece (200). The second connecting portion (34) extends into the base (5) and is connected to the second fastener (4).

4. The gear hobbing and gear grinding fixture according to claim 1, characterized in that: The guide sleeve (6) comprises a sleeve body (61), a plurality of positioning through holes are formed on the sleeve body (61), and a guide ball (62) is placed in each positioning through hole.

5. The gear hobbing and grinding fixture according to claim 1, characterized in that: The bottom of the pressing plate (1) is provided with a hollow portion (11), and the depth of the hollow portion (11) gradually increases from the edge to the center.

6. The gear hobbing and gear grinding fixture according to claim 1, characterized in that: The base (5) is made of ductile iron.

7. The gear hobbing and gear grinding fixture according to claim 2, characterized in that: The inner hole (53) is a conical surface.

8. The gear hobbing and gear grinding fixture according to claim 3, characterized in that: The support portion (32) is cylindrical as a whole, and the outer diameter of the support portion (32) is greater than the outer diameter of the upper end surface of the base (5).

9. The gear hobbing and gear grinding fixture according to claim 3, characterized in that: The middle portion of the pressing plate (1) has a through hole, and the outer diameter of the through hole is adapted to the inner diameter of the first connecting portion (33).

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