CN214161646U - High-speed positioning center device of gear grinding machine - Google Patents

Abstract

The utility model discloses a high-speed positioning centre device of a gear grinding machine, which comprises a shell taper shank, a balance bearing group, a stressed bearing group, a centre shaft, a stress spring, a step, a positioning boss, a supporting and positioning sleeve and a centre head; one end of the shell taper shank is an open hollow cylinder, and the side wall of the inner cavity of the open hollow cylinder is provided with a step and a step positioning boss in sequence from the bottom surface to the top surface of the open; the step is used for mounting a balance bearing group and bearing radial force; the step positioning boss is used for installing a stressed bearing group and bearing the axial force. The centre device of the utility model bears the radial force and the axial force through the stress bearing and the balance bearing, the bearing force is strong, the rigidity is good, the stress is uniform, the parts are not easy to be worn, and the precision is higher; the connecting part of the taper shank and the tip sleeve is provided with a spring device which can play a role in positioning auxiliary support.

Description

High-speed positioning center device of gear grinding machine

Technical Field

The utility model relates to the technical field of machining, especially, relate to a top device of high-speed location of gear grinding machine.

Background

At present, the tip of a tail stock is used for machining shaft parts or disc parts in gear grinding; there are generally two types of tips used:

1. single fixed centre: the friction is generally reduced by applying grease to the ends and tips of the parts during machining;

2. rotatable centre: the use of a rotatable tip reduces friction between the workpiece and the tip during high-intensity machining in large batches.

The existing centre has the following problems:

(1) at present, most of finials adopted in the market are dead centers, in the grinding process, two center holes of a workpiece are easily abraded, a bracket is abraded, a machining standard is lost, the machining precision cannot be guaranteed, when lubricating grease is used, the machining cost is increased, and the workload is increased;

(2) the limit rotating speed of the rotatable center is generally 3000-5000 rpm, and cannot reach more than 6000 rpm at present, so that the rotatable center cannot be applied to high-speed fields such as a high-speed numerical control machining center and the like, the requirements of enterprise production cannot be met, and the development of enterprises is restricted;

(3) when the gear grinding high-precision machining is carried out, the coaxiality requirement of the tailstock rotating center and the workbench rotating center is extremely high, the tailstock center device plays a vital role in machining, and the existing live center does not have an auxiliary positioning function, so that the machining quality is reduced.

Therefore, a high-speed positioning tip device of a gear grinding machine is urgently needed to solve the problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a high-speed positioning top device of a gear grinding machine, which jointly bears radial force and axial force through a stressed bearing and a balance bearing, has strong bearing capacity, good rigidity and even stress, is not easy to wear parts and has higher precision; the connecting part of the taper shank and the tip sleeve is provided with a spring device which can play a role in positioning auxiliary support.

In order to realize the purpose, the following technical scheme is provided:

a high-speed positioning centre device of a gear grinding machine is characterized by comprising a shell taper shank 1, a balance bearing group 2, a stressed bearing group 3, a centre shaft 5, a stress spring 6, a step 11, a positioning boss 12, a supporting and positioning sleeve 9 and a centre head 10;

one end of the shell taper shank 1 is an open hollow cylinder, and the side wall of the inner cavity of the open hollow cylinder is provided with a step 11 and a positioning boss 12 in sequence from the bottom surface to the top surface of the open; the step 11 is used for installing the balance bearing group 2 and bearing the action of radial force; the positioning boss 12 is used for installing the stressed bearing group 3 and bearing the axial force.

Further, the thickness of the side wall of the cylinder at the step 11 is greater than that of the side wall of the cylinder at the positioning boss 12.

Further, the tip shaft 5 is connected with a washer 7 supporting and positioning sleeve 9 through a stress spring 6.

Further, the center shaft 5 is a through shaft, and sequentially comprises a stress shaft 51, a sealing shaft 52 and a center fixing shaft 53 along the direction from the taper rod to the hollow cylinder of the shell taper shank 1; the diameter of the sealing shaft 52 is larger than the diameters of the stress shaft 51 and the tip fixing shaft 53; the stress shaft 51 is positioned in the hollow cylinder of the opening of the shell taper shank 1, the tip fixing shaft 53 is a cylindrical shaft with a variable section, the diameters of the cross sections of the stress shaft 51 and the tip fixing shaft are sequentially reduced from the sealing shaft 52 to the tip 10, and the diameters of the stress shaft and the tip fixing shaft are smaller than the diameter of the tip 10. The center fixing shaft 53 is connected with a groove at the central axis of the center point 10 through a small diameter portion thereof.

Furthermore, the end face of the positioning boss 12 is used as a positioning reference, the outer circumferential surface close to the free end face of the stressed shaft 51 is connected with a balance bearing group 2, and the outer circumferential surface of the outer ring of the balance bearing group 2 and the inner circumferential surface of the inner ring are respectively contacted with the inner wall of the housing taper shank 1 and the outer wall surface of the stressed shaft 51; the outer circumferential surface close to the sealing shaft 52 is connected with a force bearing set 3.

Further, a sealing cover 4 is arranged between the sealing shaft 52 and the opening hollow cylinder, and the sealing cover 4 is hermetically connected with the sealing shaft 52 and the opening hollow cylinder.

Further, the supporting and positioning sleeve 9 is a thin-walled cylinder with a variable diameter, the inner diameter of the cylinder is not changed, and the diameter of the cylinder is slightly larger than that of the apex 10; the washer 7 is connected with a supporting and positioning sleeve 9 through a bolt 8.

Further, the supporting and positioning sleeve 9 is a multi-size layered positioning sleeve.

Further, the tip 10 is characterized by a cone angle of 60 ° or 75 °.

Further, a spring strength control mechanism is also included between the tip shaft 5 and the tip 10.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the utility model discloses top device bears radial force and axial force jointly through atress bearing and balance bearing, and the bearing capacity is strong, the rigidity is good, the atress is even to parts are difficult for wearing and tearing, the precision is higher, long service life, grinding efficiency is high, thereby makes manufacturing cost reduce.

2. Secondly the utility model discloses a limit rotation generally at 6000 commentaries on classics/minute, can be applied to high-speed fields such as high-speed numerical control processing equipment, improve the cutting efficiency of digit control machine tool greatly.

3. The utility model discloses built-in ball device can rotate along with the main shaft is rotatory, is difficult for grinding the part centre bore.

4. The utility model discloses taper shank and top muffjoint department are equipped with spring assembly, can play the effect of location auxiliary stay.

Drawings

Fig. 1 is a schematic structural view of a high-speed positioning center device of a gear grinding machine according to an embodiment of the present invention;

fig. 2 is a sectional view a-a of a high-speed positioning center device of a gear grinding machine according to an embodiment of the present invention;

reference numerals:

1-shell taper shank, 11-step, 12-positioning boss, 2-balance bearing group, 3-stress bearing group, 4-sealing cover, 5-tip shaft, 51-stress shaft, 52-sealing shaft, 53-tip fixing shaft, 6-stress spring, 7-gasket, 8-bolt, 9-supporting positioning sleeve and 10-tip.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description of the present invention and simplification of description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; either mechanically or electrically. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, the high-speed positioning center device of the gear grinding machine comprises a shell taper shank 1, a balance bearing set 2, a stressed bearing set 3, a sealing cover 4, a center shaft 5, a stress spring 6, a step 11, a positioning boss 12, a gasket 7, a supporting and positioning sleeve 9, a center 10 and the like.

The shell taper shank 1 is connected with a tail seat shaft of the gear grinding machine, one end of the shell taper shank 1 is a taper rod, and the other end of the shell taper shank is an open hollow cylinder. The side wall of the inner cavity of the open hollow cylinder is provided with a step 11 and a positioning boss 12 in sequence from the bottom surface to the top surface of the open hollow cylinder. The thickness of the side wall of the cylinder at the step 11 is greater than that of the side wall of the cylinder at the positioning boss 12. The step 11 is used for installing the balance bearing group 2, and the positioning boss 12 is used for installing the stressed bearing group 3. The balance bearing group 2 is composed of at least one angular contact ball bearing; the stressed bearing group 3 is composed of at least two groups of angular contact ball bearings and bears the axial force. The balance bearing group 2 and the stressed bearing group 3 work together, so that the product has high rotating speed performance, long service life and higher precision.

The center shaft 5 is a through shaft, and sequentially comprises a stress shaft 51, a sealing shaft 52 and a center fixing shaft 53 along the direction from the taper rod to the hollow cylinder of the opening of the housing taper shank 1, and the stress shaft, the sealing shaft and the center fixing shaft are cylindrical shafts. The force bearing shaft 51 is a cylindrical shaft, and the diameter of the force bearing shaft is unchanged. The diameter of the sealing shaft 52 is larger than the diameters of the force bearing shaft 51 and the tip fixing shaft 53. The stressed shaft 51 is positioned in the hollow cylinder of the shell taper shank 1, and the end surface of the positioning boss 12 is used as a positioning reference. The outer circumferential surface of the outer ring and the inner circumferential surface of the inner ring of the balance bearing group 2 are respectively contacted with the inner wall of the housing taper shank 1 and the outer wall surface of the stress shaft 51. The diameter of the sealing shaft 52 is equal to the outer diameter of the hollow cylinder of the opening of the housing taper shank 1, a sealing cover 4 is arranged between the sealing shaft 52 and the hollow cylinder of the opening, the sealing cover 4 is a hollow flat cylinder, and the outer diameter of the sealing cover is equal to the diameter of the sealing shaft 52. The sealing cover 4 is hermetically connected with the sealing shaft 52 and the hollow cylinder, so that the bearing assembly inside the shell taper shank 1 is sealed. The sealing shaft 52 is connected with a gasket 7 on the supporting and positioning sleeve 9 through a stress spring 6, so that the telescopic effect is achieved, and the auxiliary positioning and supporting position can be adjusted according to different parts. The center fixing shaft 53 is a cylindrical shaft with a variable section, the diameters of the cross sections of the center fixing shaft 53 in the direction from the sealing shaft 52 to the center 10 are sequentially reduced, and the diameters of the cross sections are smaller than the diameter of the center 10. The center fixing shaft 53 is in clearance fit with the gasket 7, the diameter of the gasket 7 is slightly smaller than that of the center fixing shaft 53, and the center fixing shaft 53 is connected with a groove in the central shaft of the center point 10 through a small-diameter part of the center fixing shaft.

The supporting and positioning sleeve 9 is a variable-diameter thin-wall cylinder, the inner diameter of the supporting and positioning sleeve is constant and is slightly larger than the diameter of the top pointed end 10, so that the top pointed end 10 can be conveniently placed in the supporting and positioning sleeve; the outer diameter thereof includes two dimensions, the outer diameter of one end of the contact washer 8 is equal to the diameter dimension of the seal shaft 52 and is larger than the outer diameter dimension of the other end, and the height of the cylinder having the larger outer diameter dimension is much smaller than the height of the cylinder having the smaller outer diameter dimension. The cylindrical part with the large outer diameter of the supporting and positioning sleeve 9 is provided with a plurality of through threaded holes, and the axial direction of the threaded holes is parallel to the axial direction of the supporting and positioning sleeve 9, so that the gasket 7 is connected with the supporting and positioning sleeve 9 through the bolts 8. The washer outer diameter is equal to the seal shaft 52 diameter dimension.

Preferably, the taper angle of the tip 10 is 60 ° or 75 °.

Preferably, the supporting and positioning sleeve 9 is a multi-size layered positioning sleeve.

Preferably, a single fixed spring is arranged between the tip shaft 5 and the tip 10, and a spring strength control mechanism is further included.

It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims (10)

1. A high-speed positioning center device of a gear grinding machine is characterized by comprising a shell taper shank (1), a balance bearing set (2), a stressed bearing set (3), a center shaft (5), a stress spring (6), a step (11), a positioning boss (12), a supporting and positioning sleeve (9) and a center head (10);

one end of the shell taper shank (1) is an open hollow cylinder, and the side wall of the inner cavity of the open hollow cylinder is provided with a step (11) and a positioning boss (12) in sequence from the bottom surface to the top surface of the open; the step (11) is used for mounting the balance bearing group (2) and bearing radial force; the positioning boss (12) is used for mounting the stressed bearing group (3) and bearing the axial force.

2. A high speed positioning and center device of a gear grinding machine according to claim 1, wherein the thickness of the side wall of the cylinder at the step (11) is larger than the thickness of the side wall of the cylinder at the positioning boss (12).

3. A high-speed setting center device of a gear grinding machine according to claim 2, characterized in that the center shaft (5) is connected to a washer (7) supporting the setting sleeve (9) by a stress spring (6).

4. A high-speed positioning centre device of a gear grinding machine according to claim 3, characterized in that the centre shaft (5) is a through shaft, and comprises a stress shaft (51), a sealing shaft (52) and a centre fixing shaft (53) in sequence along the direction from the taper rod to the open hollow cylinder of the housing taper shank (1); the diameter of the sealing shaft (52) is larger than the diameters of the stress shaft (51) and the tip fixing shaft (53); the stress shaft (51) is positioned in an opening hollow cylinder of the shell taper shank (1), the tip fixing shaft (53) is a variable-section cylindrical shaft, the diameters of the cross sections of the sealing shaft (52) and the tip (10) are sequentially reduced, and the diameters of the cross sections are smaller than the diameter of the tip (10); the centre fixing shaft (53) is connected with a groove at the central shaft of the centre head (10) through a small-diameter part of the centre fixing shaft.

5. The high-speed positioning center device of the gear grinding machine according to claim 4, characterized in that the end face of the positioning boss (12) is used as a positioning reference, the outer circumferential surface close to the free end face of the stress shaft (51) is connected with the balance bearing set (2), and the outer circumferential surface of the outer ring and the inner circumferential surface of the inner ring of the balance bearing set (2) are respectively contacted with the inner wall of the housing taper shank (1) and the outer wall surface of the stress shaft (51); the outer circumferential surface close to the sealing shaft (52) is connected with a stressed bearing set (3).

6. A high-speed positioning and center device of a gear grinding machine as claimed in claim 5, characterized in that a sealing cover (4) is arranged between the sealing shaft (52) and the open hollow cylinder, and the sealing cover (4) is hermetically connected with the sealing shaft (52) and the open hollow cylinder.

7. A high-speed positioning centre device of a gear grinding machine as claimed in claim 6, characterized in that the supporting and positioning sleeve (9) is a thin-walled cylinder with a variable diameter, the inner diameter of which is constant and is slightly larger than the diameter of the centre tip (10); the washer (7) is connected with the supporting and positioning sleeve (9) through a bolt (8).

8. A high-speed setting head assembly of a gear grinding machine as set forth in claim 6 wherein the supporting and positioning sleeve (9) is a multi-sized layered positioning sleeve.

9. A high speed setting point assembly for a gear grinding machine according to any of claims 1 to 8 wherein the angle of taper of the point (10) is 60 ° or 75 °.

10. A high speed setting point device of a gear grinding machine according to any of the claims 1-8 characterized in that between the point shaft (5) and the point (10) further spring strength control means are included.

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