CN211638566U

CN211638566U - Gear hobbing frock

Info

Publication number: CN211638566U
Application number: CN202020065777.7U
Authority: CN
Inventors: 伍涛
Original assignee: Chongqing Qitong Automobile Parts Co ltd
Current assignee: Chongqing Qitong Automobile Parts Co ltd
Priority date: 2020-01-13
Filing date: 2020-01-13
Publication date: 2020-10-09
Anticipated expiration: 2030-01-13

Abstract

The utility model relates to the field of machining equipment, in particular to a hobbing tool, which comprises a positioning shaft and a first steel ball sleeve, wherein the positioning shaft is a hollow cylinder, the outer wall of the upper part of the positioning shaft is provided with a boss, the first steel ball sleeve is arranged outside the boss, the first steel ball sleeve is provided with a plurality of openings, a steel ball is embedded in each opening, and the inner wall of a workpiece is contacted with the steel ball; the first steel ball sleeve is in interference fit with the positioning shaft. This application establishes a first steel ball cover that is embedded with the steel ball through at the location axle overcoat, and the inner wall and the steel ball contact of work piece, and the steel ball is the point contact with the work piece, and the area of contact reduces to the steel ball is pivoted in the trompil, consequently when the installation with take off the work piece, work piece and steel ball rolling contact can reduce the frictional force between work piece and the first steel ball cover, have saved the installation and have taken off the time, thereby improve work efficiency. And when the workpiece is installed and taken down, the workpiece is not required to be knocked by using a tool, so that the precision of the workpiece is not influenced.

Description

Gear hobbing frock

Technical Field

The utility model relates to a machining equipment field, concretely relates to gear hobbing frock.

Background

With the increasing production cost of enterprises and the popularization of intelligent processing technology of the enterprises, the production of small batches and multiple batches is increasing. When the gear hobbing process is carried out on a workpiece, the workpiece needs to be sleeved on a tool, and gear hobbing is carried out on the outer wall of the workpiece. In order to meet the precision requirement, the clearance between the inner diameter of the workpiece and the outer diameter of the tool is 0.01mm-0.03mm when the outer wall is subjected to hobbing. Because the clearance undersize between work piece and the frock, when installing and taking off the work piece, the area of contact between the inner wall of work piece and the outer wall of frock is big, and frictional force is big, need use the instrument to strike when installing and taking off the work piece, has just so reduced work efficiency to can influence the size of work piece, reduce the precision at the strike in-process probably.

Disclosure of Invention

The invention provides a hobbing tool aiming at the problems that the work efficiency is low and the precision of a workpiece is possibly influenced because the workpiece needs to be knocked by using a tool when the existing tool is used for installing and taking off the workpiece.

In order to achieve the above purpose, the invention provides the following technical scheme:

a gear hobbing tool comprises a positioning shaft and a first steel ball sleeve, wherein the positioning shaft is a hollow cylinder, a boss is arranged on the outer wall of the upper part of the positioning shaft, the first steel ball sleeve is sleeved outside the boss, a plurality of openings are formed in the first steel ball sleeve, a steel ball is embedded in each opening, the steel balls can rotate in the openings, and the inner wall of a workpiece is in contact with the steel balls; the steel ball can rotate in the open pore.

Preferably, the hobbing tool further comprises a pressing assembly; the pressing assembly is positioned on the boss and used for pressing a workpiece; the pressing assembly comprises a pressing shaft, a pressing block and a bearing; a positioning table is arranged on the pressing shaft, and the bearing is sleeved outside the pressing shaft; the pressing block is an L-shaped pressing block, the horizontal section of the pressing block is located at the upper part of the positioning table, the first steel ball sleeve is in interference fit with the positioning shaft, and the pressing block is in interference fit with the bearing. When the workpiece to be processed rotates along with the positioning shaft, the pressing block rotates along with the workpiece to be processed, and a bearing is arranged between the pressing shaft and the pressing block, so that the pressing shaft cannot rotate. The pressing shaft in the application can be a piston rod of the hydraulic oil cylinder, so that a stable force can be provided for a workpiece to be machined through the hydraulic oil cylinder, the workpiece to be machined is firmly fixed on the boss, and the workpiece to be machined cannot jump along the axial direction.

Preferably, the pressing block comprises a first pressing piece and a second pressing piece, the first pressing piece is of an L shape, a horizontal section of the first pressing piece is located on the positioning table, the cross section of the second pressing piece is of a sector shape, and the first pressing piece is connected with the second pressing piece through a bolt; the first pressing piece and the second pressing piece are sleeved outside the bearing. The workpiece to be processed is pressed through the second pressing piece, the second pressing piece is detachably connected with the first pressing piece through a bolt, the section of the second pressing piece is fan-shaped, and the perimeter of one end far away from the first pressing piece is larger than the perimeter of one end close to the first pressing piece. Therefore, the workpieces of different sizes are only required to be replaced by the second pressing piece, the first pressing piece does not need to be replaced, and time is saved.

Preferably, one end of the pressing shaft extends into the positioning shaft, a groove is formed in the inner wall of the positioning shaft, a second steel ball sleeve is arranged in the groove, a plurality of steel balls are arranged on the second steel ball sleeve, and the steel balls are in contact with the pressing shaft. In order to ensure that the workpiece to be processed is pressed on the positioning shaft by the pressing shaft and cannot jump and the pressing block cannot shake in the rotating process, one end of the pressing shaft extends into the positioning shaft, and the gap between the pressing shaft and the positioning shaft is small enough. But when the clearance is too small, can produce the friction between compress tightly axle and the location axle, because the compress tightly axle does not rotate along with the rotation of location axle, in order to reduce frictional force, consequently set up a recess in the location axle, installation second steel ball cover in the recess, second steel ball cover and location axle are interference fit, the embedded steel ball of second steel ball cover contacts with the compress tightly axle, the location axle just can reduce the frictional force between location axle and the compress tightly axle like this when the rotation to the compact heap can firmly compress tightly the work piece, and the work piece can not beat. When workpieces with different sizes are required to be processed, only the first steel ball sleeve and the second pressing piece need to be replaced, and the positioning shaft, the pressing shaft and the first pressing piece do not need to be replaced, so that the replacement time is saved.

Preferably, the upper end of the boss is provided with a cover plate, the cover plate is connected with the positioning shaft through a bolt, the cover plate is L-shaped, the horizontal section of the cover plate is in contact with the top of the second steel ball sleeve, and the vertical section of the cover plate is in contact with the top of the first steel ball sleeve. Further in order to prevent the first steel ball sleeve and the second steel ball sleeve from sliding out of the positioning shaft, the upper ends of the first steel ball sleeve and the second steel ball sleeve are supported through the cover plate.

Preferably, the edge of the cover plate is provided with a bulge. In order to further ensure that the workpiece to be processed rotates along with the positioning shaft, a bulge is arranged on the edge of the cover plate and embedded between the gears on the inner wall of the workpiece to be processed, so that the workpiece to be processed is further ensured to rotate along with the rotation of the positioning shaft.

Compared with the prior art, the invention has the beneficial effects that: this application establishes a first steel ball cover that is embedded with the steel ball through at the location axle overcoat, and the inner wall and the steel ball contact of work piece, and the steel ball is the point contact with the work piece, and the area of contact reduces to the steel ball is pivoted in the trompil, consequently when the installation with take off the work piece, work piece and steel ball rolling contact can reduce the frictional force between work piece and the first steel ball cover, have saved the installation and have taken off the time, thereby improve work efficiency. And when the workpiece is installed and taken down, the workpiece is not required to be knocked by using a tool, so that the precision of the workpiece is not influenced.

Description of the drawings:

fig. 1 is a cross-sectional view of a gear hobbing tool provided in the present application;

FIG. 2 is a schematic view, partly in section, of a hold-down assembly;

FIG. 3 is an enlarged view of A in FIG. 2;

fig. 4 is a schematic view of a part of a mechanism of a gear hobbing tool provided by the present application;

FIG. 5 is a schematic structural view of a cover plate;

FIG. 6 is a schematic structural view of a first steel ball sleeve;

fig. 7 is a schematic structural view of the second steel ball sleeve.

The labels in the figure are: 1-a positioning shaft, 11-a boss, 2-a first steel ball sleeve, 21-an opening, 22-a steel ball, 3-a pressing component, 31-a pressing shaft, 311-a positioning table, 32-a pressing block, 321-a first pressing piece, 322-a second pressing piece, 33-a bearing, 4-a second steel ball sleeve, 5-a cover plate, 51-a protrusion, 6-a base and 7-a workpiece.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.

In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection via an intermediate medium, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.

As shown in fig. 1 to 4, the present application provides a gear hobbing tool, which includes a positioning shaft 1, a first steel ball sleeve 2, a second steel ball sleeve 4 and a pressing component 3, wherein the positioning shaft 1 is a hollow cylinder, a boss 11 is arranged on an outer wall of an upper portion of the positioning shaft 1, the first steel ball sleeve 2 is sleeved outside the boss 11, a plurality of openings 21 are arranged on the first steel ball sleeve 2, a steel ball 22 is embedded in each opening 21, the steel ball 22 can rotate in the opening 21, and an inner wall of a workpiece 7 is in contact with the steel ball 22; first steel ball cover 2 and location axle 1 interference fit, location axle 1 is installed in base 6.

The inner wall of the positioning shaft 1 is provided with a groove, and the second steel ball sleeve 4 is arranged in the groove and is in interference fit with the positioning shaft 1. The steel balls 22 on the first steel ball sleeve 2 are outwards contacted with the workpiece 7 to be processed and inwards contacted with the outer wall of the positioning shaft 1; the steel balls 22 on the second steel ball sleeve 4 are outwards contacted with the inner wall of the positioning shaft 1 and are internally contacted with the pressing shaft 31 in the pressing component 3.

As shown in fig. 6, the openings 21 on the first steel ball sleeve 2 are uniformly arranged along the circumference of the first steel ball sleeve 2, and the openings 21 between two adjacent layers are arranged at intervals, so that when the workpiece 7 to be processed is sleeved on the first steel ball sleeve 2, the rotation of the workpiece 7 to be processed is smoother. As shown in fig. 7, the openings 21 of the second ball sleeve 4 are also uniformly arranged along the circumference of the second ball sleeve 4, and each row of openings 21 is not parallel to the axis of the second ball sleeve 4. Thus, the second steel ball sleeve 4 is more conveniently assembled in the positioning shaft 1.

In order to ensure that the first steel ball sleeve 2 and the second steel ball sleeve 4 cannot slide out of the positioning shaft 1, a cover plate 5 is arranged at the top end of the positioning shaft 1, as shown in fig. 5, the cover plate 5 is connected with the positioning shaft 1 through a bolt, the cross section of the cover plate 5 is L-shaped, the horizontal section of the cover plate 5 is in contact with the top of the second steel ball sleeve 4, and the vertical section of the cover plate 5 is in contact with the top of the first steel ball sleeve 2. The edge of the cover plate 5 is provided with a projection 51, and the projection 51 is embedded into the teeth of the inner wall of the workpiece 7 to be processed. The middle of the cover plate 5 is provided with a hole for the pressing shaft 31 to pass through, the inner edge of the cover plate 5 is aligned with the inner wall of the second steel ball sleeve 4, and the outer edge of the cover plate 5 is aligned with the outer wall of the first steel ball sleeve 2, namely the thickness of the cover plate 5 is equal to the sum of the thickness of the second steel ball sleeve 4, the thickness of the boss 11 and the thickness of the first steel ball sleeve 2. As shown in fig. 2 and 3, the pressing assembly 3 includes a pressing shaft 31, a pressing block 32, and a bearing 33; a positioning table 311 is arranged on the pressing shaft 31, and the bearing 33 is sleeved outside the pressing shaft 31; the pressing block 32 is L-shaped, the horizontal section of the pressing block 32 is located at the upper part of the positioning table 311, and the pressing block 32 is in interference fit with the bearing 33. The pressing block 32 comprises a first pressing piece 321 and a second pressing piece 322, the first pressing piece 321 is L-shaped, the horizontal section of the first pressing piece 321 is located on the positioning table 311, the section of the second pressing piece 322 is fan-shaped, and the first pressing piece 321 is connected with the second pressing piece 322 through a bolt; the first pressing piece 321 and the second pressing piece 322 are sleeved outside the bearing 33; one end of the pressing shaft 31 extends into the positioning shaft 1. The axis of the pressing shaft 31 coincides with the axis of the positioning shaft 1.

The conical surface bearing 33 is adopted in the drawing in the application, the pressing block 32 formed by combining the first pressing piece 321 and the second pressing piece 322 is in interference fit with the bearing 33, so that after the second pressing piece 322 presses the workpiece 7, the workpiece 7 rotates along with the rotation of the positioning shaft 1 and simultaneously drives the pressing block 32 to rotate, due to the effect of the bearing 33, the pressing block 32 rotates around the pressing shaft 31, synchronous rotation is realized between the pressing block 32 and the workpiece 7 to be processed, and axial jumping cannot be generated between the pressing block 32 and the workpiece 7 to be processed.

A platform is arranged on one side, close to the cover plate 5, inside the second pressing piece 322, and is used for avoiding the bolts on the cover plate 5, and certainly, a groove is also arranged inside the second pressing piece 322 corresponding to each bolt, so that each bolt is clamped into the groove of the second pressing piece 322, and the synchronous rotation between the pressing block 32 and the positioning shaft 1 is further ensured.

Through bolted connection between second pressing member 322 and the first pressing member 321, when processing not unidimensional work piece 7, only need to change first steel ball cover 2 and second pressing member 322 can, all the other can not be changed, consequently the time of having practiced thrift.

In order to ensure that the pressing force of the pressing assembly 3 is sufficient, the application provides that the workpiece 7 to be processed is pressed by adopting a hydraulic system, and the pressing shaft 31 is a piston rod of a hydraulic oil cylinder.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. The utility model provides a gear hobbing frock, its characterized in that, includes location axle (1) and first steel ball cover (2), location axle (1) is hollow cylinder, the outer wall on location axle (1) upper portion is equipped with boss (11), first steel ball cover (2) cover is established outside boss (11), be equipped with a plurality of trompil (21) on first steel ball cover (2), every steel ball (22) have all been inlayed in trompil (21), steel ball (22) are in trompil (21) internal energy rotates.

2. The hobbing tool according to claim 1, characterized by further comprising a pressing assembly (3); the pressing component (3) is positioned on the boss (11); the pressing assembly (3) comprises a pressing shaft (31), a pressing block (32) and a bearing (33); a positioning table (311) is arranged on the pressing shaft (31), and the bearing (33) is sleeved outside the pressing shaft (31); the pressing block (32) is an L-shaped pressing block, and the horizontal section of the pressing block (32) is positioned at the upper part of the positioning table (311); the first steel ball sleeve (2) is in interference fit with the positioning shaft (1), and the pressing block (32) is in interference fit with the bearing (33).

3. The gear hobbing tool according to claim 2, characterized in that the pressing block (32) comprises a first pressing piece (321) and a second pressing piece (322), the first pressing piece (321) is L-shaped, the horizontal section of the first pressing piece (321) is located on the positioning table (311), the section of the second pressing piece (322) is fan-shaped, and the first pressing piece (321) is connected with the second pressing piece (322) through a bolt; the first pressing piece (321) and the second pressing piece (322) are sleeved outside the bearing (33).

4. The hobbing tool according to claim 3, characterized in that one end of the pressing shaft (31) extends into the positioning shaft (1), a groove is formed in the inner wall of the positioning shaft (1), a second steel ball sleeve (4) is arranged in the groove, a plurality of steel balls (22) are arranged on the second steel ball sleeve (4), and the steel balls (22) are in contact with the pressing shaft (31).

5. The hobbing tool according to claim 4, characterized in that a cover plate (5) is arranged at the upper end of the boss (11), the cover plate (5) is connected with the positioning shaft (1) through a bolt, the cover plate (5) is L-shaped, the horizontal section of the cover plate (5) is in contact with the top of the second steel ball sleeve (4), and the vertical section of the cover plate (5) is in contact with the top of the first steel ball sleeve (2).

6. The hobbing tool according to claim 5, characterized in that a protrusion (51) is arranged on the edge of the cover plate (5).