CN216731299U - Ball head grinding wheel in-situ dressing device - Google Patents

Abstract

The technical scheme of the ball head grinding wheel in-situ dressing device provided by the utility model comprises a grinding wheel dresser, wherein a rotary driving cylinder is sleeved outside the grinding wheel dresser, the rotary driving cylinder is in sliding fit with the grinding wheel dresser, and an elastic device is arranged between the end surface of the grinding wheel dresser and the inner end surface of the rotary driving cylinder; the grinding wheel dresser is characterized in that a shell capable of rotating relative to the rotary driving cylinder is sleeved outside the rotary driving cylinder, a driving motor is arranged on the end face of one side of the shell, the extending end of the driving motor is connected with the rotary driving cylinder to drive the rotary driving cylinder to rotate, an end cover with a center hole is arranged on the end face of the other side of the shell, and the extending end of the grinding wheel dresser can penetrate through the center hole of the end cover. The ball head grinding wheel is based on the generating principle, and has good process stability; the dressing barrel has a self-adaptive telescopic function and can realize automatic feeding in the grinding process; the grinding wheel dresser is easy to maintain, the whole grinding wheel dresser does not need to be replaced, and the manufacturing cost is reduced; the production line of the hand-held machine tool has multiple purposes and wide application range.

Description

Ball head grinding wheel in-situ dressing device

Technical Field

The utility model belongs to the technology of precise and ultra-precise grinding processing, relates to the technical field of in-situ finishing of ball head grinding wheels, and particularly relates to an in-situ finishing device of a ball head grinding wheel.

Background

Based on the principle of circular arc envelope grinding, the ball grinding wheel is widely applied to grinding of various complex curved surfaces, such as spherical surfaces, aspheric surfaces, free-form surfaces and the like. The ball head grinding wheel can be connected to the tool spindle through the ER chuck or the standard tool interface, so that the tool spindle is convenient to disassemble and assemble and reliable in connection. However, the ball grinding wheel used for the fine grinding of complex surfaces needs reliable in-situ finishing technology assistance, and after the grinding wheel is clamped, worn or passivated each time, in-situ precision finishing including shaping and dressing is needed, so that the radial run-out caused by clamping of a tool is eliminated, and the profile precision and the surface abrasive grain sharpness of the grinding wheel are ensured. The process of ball grinding wheel dressing is more complex than disc-shaped, cup-shaped grinding wheels and the like.

At present, the in-situ dressing method of the ball grinding wheel mainly comprises a pair rolling method and a generating method. The double-roller dressing method achieves the aims of dressing and sharpening the grinding wheel by the double functions of rolling and grinding generated on the surface of the dressed grinding wheel by the high-speed rotation of the diamond roller. The roller repaired by the rolling method generally adopts a large-particle electroplated diamond grinding wheel, has larger dressing force and higher requirements on the rigidity of the dressing shaft, the grinding wheel shaft and the machine tool guide rail. According to the traditional development type spherical surface generation principle, a ball grinding wheel is ground and dressed by a cup-shaped dresser, the grinding tool abrasion has no influence on the precision of the spherical surface profile of the grinding wheel, and the method is an effective method for in-situ precision dressing of the ball grinding wheel. The grinding and finishing are mostly carried out by grinding a sintered corundum and green silicon carbide dresser and a diamond grinding wheel, so that the grinding wheel binder is abraded and falls off to achieve the finishing purpose. Low grinding and finishing cost, small finishing force and good dressing effect. And according to the traditional generating spherical surface generating principle, the abrasion of a ball grinding wheel dressing tool for grinding and dressing the ball by adopting a cup dresser has no influence on the precision of the spherical surface profile of the grinding wheel. The same dressing principle is adopted, the dresser is replaced by a cylindrical tool electrode, and the method can also be used for discharging dressing of a metal bond ball grinding wheel.

At present, no special trimming device or machine tool module exists for the precision trimming of ball grinding wheels in the field of ultra-precision grinding processing. In the actual operation process, based on the structure of the machine tool, the cup-shaped dresser is driven by a workpiece spindle or an additional electric spindle of the machine tool, so that the ball head grinding wheel is dressed in situ. The workpiece spindle is used for taking down the workpiece in the grinding process, the dressing tool is frequently disassembled and assembled, and the machine tool needs to be changed through the additional spindle, so that the stability of the machine tool is not maintained. The utility model provides a modularized ball head grinding wheel in-situ generating and dressing device which can be held by a hand to dress a ball head grinding wheel, can be independent of a machine tool through a mechanical arm and other mechanisms, realizes in-situ dressing of the ball head grinding wheel, and is beneficial to improving the dressing efficiency of the grinding wheel and realizing grinding automation.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects in the prior art, the utility model provides the in-situ trimming device for the ball head grinding wheel, and the ball head grinding wheel is based on the generating principle and has good process stability; the dressing barrel has a self-adaptive telescopic function, can realize automatic feeding in the grinding process, keeps the grinding surface always in contact with a workpiece to be machined, and improves the machining efficiency; the ball head grinding wheel in-situ dressing device is easy to maintain, a vulnerable part of the ball head grinding wheel in-situ dressing device is a dressing barrel, the dressing barrel is fixedly connected with a connecting plate, the dressing barrel can be directly replaced after being worn, the whole grinding wheel dresser does not need to be replaced, and the manufacturing cost is reduced; the application range is wide, such as: the dressing device is suitable for single machine operation, and under the single machine working condition, the dressing device can be held by a hand to dress the grinding wheel; the grinding machine tool is suitable for machine tool operation, can be used as an independent module and integrated on a grinding machine tool, and improves the function of the machine tool; the automatic ball grinding wheel dresser is suitable for automatic production line equipment, can be integrated at the tail end of a manipulator, and can realize all subsequent in-place precision dressing automation after one-time tool setting by selecting a proper dresser under the condition of determining the size of a ball grinding wheel on the premise of efficient continuous production.

The technical scheme of the ball head grinding wheel in-situ dressing device provided by the utility model comprises a grinding wheel dresser, wherein a rotary driving cylinder is sleeved outside the grinding wheel dresser, the rotary driving cylinder is in sliding fit with the grinding wheel dresser, and an elastic device is arranged between the grinding wheel dresser and the rotary driving cylinder; the grinding wheel dresser is characterized in that a shell capable of rotating relative to the rotary driving cylinder is sleeved outside the rotary driving cylinder, a driving motor is arranged on the end face of one side of the shell, the extending end of the driving motor is connected with the rotary driving cylinder to drive the rotary driving cylinder to rotate, an end cover with a center hole is arranged on the end face of the other side of the shell, and the extending end of the grinding wheel dresser can penetrate through the center hole of the end cover.

Preferably, the shell is provided with a switching flange surface, and the switching flange surface is provided with a plurality of threaded holes.

According to the optimization scheme, the adapter flange surface can provide an adapter interface for a handheld device, a machine tool and a manipulator, and the application range of the ball head grinding wheel in-situ finishing device is expanded.

Preferably, the inner side wall of the shell is in clearance fit with the outer side wall of the rotary driving cylinder, or a group of bearings are arranged between the inner side wall of the shell and the outer side wall of the rotary driving cylinder, and the number of the bearings is at least 2.

According to the optimization scheme, the shell and the rotary driving cylinder can realize stable relative rotation, and preferably, a group of bearings are arranged between the inner side wall of the shell and the outer side wall of the rotary driving cylinder, so that the relative rotary resistance of the bearings is reduced.

Preferably, the end face of the shell is provided with a central hole, the end part of the rotary driving cylinder is provided with a shaft head, and the shaft head penetrates through the central hole of the end face of the shell and is in clearance fit with the central hole.

According to the optimized scheme, the shaft head outer cylindrical surface at the end part of the rotary driving cylinder is in clearance fit with the central hole of the end surface of the shell, so that relative rotation can be realized, and external dust and particles are not easy to enter.

Preferably, a first sealing device is arranged between the side wall of the shaft head and the side wall of the center hole of the end face of the shell.

According to this optimization scheme, set up first sealing device and prevent that external dust, granule from getting into finishing device inside from the motor side.

Preferably, a second sealing device is arranged between the side wall of the central hole of the end cover and the side wall of the grinding wheel dresser.

According to the optimized scheme, the second sealing device is arranged to prevent waste materials and dust generated by grinding from entering the interior of the trimming device.

Preferably, the grinding wheel dresser comprises a connecting plate and a dressing barrel which are fixedly connected in sequence, at least one protrusion is arranged on the connecting plate in the circumferential direction, and a long-strip-shaped groove matched with the protrusion is formed in the inner wall of the rotary driving barrel.

According to the optimization scheme, the grinding wheel dresser and the rotary driving cylinder synchronously rotate and relatively slide along the axial direction.

Preferably, the elastic device is a spring, an oil buffer, a pneumatic buffer or a spring plate.

According to the optimized scheme, the elastic damping device between the end face of the grinding wheel dresser and the inner end face of the rotary driving cylinder can buffer vibration, so that the inner edge of the dressing barrel and a workpiece to be machined are always kept in a compressed state, and the situations of incomplete feeding and incomplete machining are prevented.

Compared with the prior art, the application has the following remarkable progress:

1) based on the generation principle, the process stability is good: the generating principle is suitable for trimming the spherical surface of the grinding wheel, the follow-up machining allowance can be reduced and the production cost can be reduced by improving the trimming contour accuracy and the trimming efficiency of the ball head grinding wheel, and the size of the grinding wheel is not influenced by other factors in the whole trimming process due to the determined size of the trimmer, so that the trimmed ball head grinding wheel is stable in size and high in contour accuracy;

2) the dressing barrel has a self-adaptive telescopic function, can realize automatic feeding in the grinding process, keeps the grinding surface always in contact with a workpiece to be machined, and improves the machining efficiency;

3) the ball head grinding wheel in-situ trimming device is easy to maintain, a quick-wear part of the ball head grinding wheel in-situ trimming device is a trimming barrel, the trimming barrel is fixedly connected with a connecting plate, the trimming barrel can be directly replaced after being worn, the whole grinding wheel trimmer does not need to be replaced, and the manufacturing cost is reduced;

4) the application range is wide, such as: the dressing device is suitable for single machine operation, and under the single machine working condition, the dressing device can be held by a hand to dress the grinding wheel; the grinding machine tool is suitable for machine tool operation, can be used as an independent module and integrated on a grinding machine tool, and improves the function of the machine tool; the automatic ball grinding wheel dresser is suitable for automatic production line equipment, can be integrated at the tail end of a manipulator, and can realize all subsequent in-place precision dressing automation after one-time tool setting by selecting a proper dresser under the condition of determining the size of a ball grinding wheel on the premise of efficient continuous production.

Drawings

FIG. 1 is a cross-sectional view of a ball grinding wheel in-situ dressing apparatus of the present invention;

FIG. 2 is a schematic structural diagram of the ball grinding wheel in-situ dressing device of the utility model;

FIG. 3 is a schematic structural view of a wheel dresser of the present invention;

FIG. 4 is a schematic structural view of the rotary drive drum of the present invention in the direction of the inner cylinder;

FIG. 5 is a schematic view of the structure of the rotary driving drum of the present invention in the direction of the outer cylinder;

FIG. 6 is a schematic structural diagram of a handheld ball grinding wheel in-situ dressing device in embodiment 1 of the present invention;

FIG. 7 is a schematic structural view of a ball grinding wheel in-situ truing device mounted at the end of a machine tool in embodiment 2 of the present invention;

fig. 8 is a diagram showing a positional relationship between the ball grinding wheel in-situ dressing apparatus and the workpiece in embodiment 2 of the present invention.

Description of the reference numerals

1-a ball head grinding wheel in-situ trimming device, 11-a driving motor, 12-a shell, 121-an adapter flange surface, 13-an elastic device, 14-a rotary driving cylinder, 141-a strip-shaped groove, 142-an inner end surface of the rotary driving cylinder, 143-a shaft head, 15-a grinding wheel trimmer, 151-a connecting plate, 1511-a protrusion, 1512-an end surface of the grinding wheel trimmer, 152-a trimming barrel, 16-a bearing, 17-an end cover, 18-a first sealing device and 19-a second sealing device; 2-a hand-held housing; 3-parallel machine tool.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments (examples), which are described herein for illustrative purposes only and are not intended to be a basis for limiting the present invention.

Referring to fig. 1-5, the ball grinding wheel in-situ dressing device 1 of the present invention comprises a grinding wheel dresser 15, wherein a rotary driving cylinder 14 is sleeved outside the grinding wheel dresser 15, the rotary driving cylinder 14 is in sliding fit with the grinding wheel dresser 15, and an elastic device 13 is arranged between the grinding wheel dresser 15 and the rotary driving cylinder 14; the grinding wheel dresser 14 is externally sleeved with a shell 12 which can rotate relative to the shell, a driving motor 11 is arranged on one side end face of the shell 12, an extending end of the driving motor 11 is connected with the rotary driving cylinder 14 to drive the rotary driving cylinder 14 to rotate, an end cover 17 with a central hole is arranged on the other side end face of the shell 12, and an extending end of the grinding wheel dresser 15 can penetrate through the central hole of the end cover 17.

The housing 12 is provided with an adapter flange surface 121, and the adapter flange surface 121 is provided with a plurality of threaded holes.

A group of bearings 16 are arranged between the inner side wall of the shell 12 and the outer side wall of the rotary driving cylinder 14, and the number of the bearings 16 is 2.

The end face of the shell 12 is provided with a central hole, the end part of the rotary driving cylinder 14 is provided with a shaft head 143, and the shaft head 143 penetrates through the central hole of the end face of the shell 12 and is in clearance fit with the central hole. A first sealing device 18 is arranged between the side wall of the shaft head 143 and the side wall of the central hole of the end surface of the shell 12.

And a second sealing device 19 is arranged between the side wall of the central hole of the end cover 17 and the side wall of the grinding wheel dresser 15.

The grinding wheel dresser 15 comprises a connecting plate 151 and a dressing barrel 152 which are fixedly connected in sequence, at least one protrusion 1511 is arranged on the connecting plate 151 in the circumferential direction, and a long-strip-shaped groove 141 matched with the protrusion 1511 is arranged on the inner wall of the rotary driving barrel 14.

The elastic means 13 is a spring.

Referring to fig. 8, a generating method is used for precisely dressing the ball grinding wheel, the rotation axis of the grinding wheel dresser 15 and the rotation axis of the grinding wheel are coplanar and intersect at a point, the inclination angle of the grinding wheel shaft is theta, the grinding wheel dresser 15 and the ball grinding wheel rotate around the respective axes and perform relative feeding motion, the spherical surface of the grinding wheel can be dressed, and the hemispherical grinding wheel with a target radius can be dressed by selecting the grinding wheel dresser 15 with a proper diameter. According to the method, a metal bond cup-shaped grinding wheel is selected as a ball head grinding wheel obtained by trimming of the grinding wheel dresser 15, the diameter of the grinding wheel is about 1mm, and the outline PV value is about 1-2 microns.

The same dressing principle is adopted, the grinding wheel dresser 15 is replaced by a cylindrical tool electrode, the dressing method can also be used for dressing a metal bond ball head diamond grinding wheel, and the surface shape error of a 3mm profile on the surface of the dressed grinding wheel can reach below 4 micrometers under the optimal technological parameters.

The cup-shaped dresser can select materials such as sintered corundum, green silicon carbide and the like with different hardness according to the characteristics such as a bonding agent, granularity and the like of a dressed grinding wheel.

Example 1:

referring to fig. 6, the ball head grinding wheel in-situ dressing device 1 of the present invention includes a grinding wheel dresser 15, a rotary driving cylinder 14 is sleeved outside the grinding wheel dresser 15, the rotary driving cylinder 14 is in sliding fit with the grinding wheel dresser 15, and an elastic device 13 is disposed between an end face 1512 of the grinding wheel dresser and an inner end face 142 of the rotary driving cylinder; the grinding wheel dresser 14 is externally sleeved with a shell 12 which can rotate relative to the shell, a driving motor 11 is arranged on one side end face of the shell 12, an extending end of the driving motor 11 is connected with the rotary driving cylinder 14 to drive the rotary driving cylinder 14 to rotate, an end cover 17 with a central hole is arranged on the other side end face of the shell 12, and an extending end of the grinding wheel dresser 15 can penetrate through the central hole of the end cover 17.

When in use, the ball head grinding wheel in-situ dressing device 1 is connected with the handheld shell 2; butting the inner edge of the end part of the trimming barrel 152 with a trimmed piece, starting the driving motor 11, and adjusting the orientation of the trimming barrel along with time; when the end inner edge of the finishing barrel 152 is worn seriously, the finishing barrel 152 is replaced.

Example 2

Referring to fig. 7, the difference from embodiment 1 is that the ball grinding wheel in-situ dressing device 1 is connected to an end effector of a parallel machine tool 3 or an end effector of a manipulator; the position of the ball grinding wheel in-situ trimming device 1 is adjusted through a parallel machine tool 3 or a mechanical arm, the inner edge of the end part of the trimming barrel 152 is butted with a trimmed part, the driving motor 11 is started, and the orientation of the trimming barrel is adjusted along with time.

It will be appreciated by those of ordinary skill in the art that in the embodiments described above, numerous technical details are set forth in order to provide a better understanding of the present application. However, the technical solutions claimed in the claims of the present application can be basically implemented without these technical details and various changes and modifications based on the above-described embodiments. Accordingly, in actual practice, various changes in form and detail may be made to the above-described embodiments without departing from the spirit and scope of the utility model.

Claims (8)

1. Ball head emery wheel normal position trimming device (1), its characterized in that: the grinding wheel dresser comprises a grinding wheel dresser (15), wherein a rotary driving cylinder (14) is sleeved outside the grinding wheel dresser (15), the rotary driving cylinder (14) is in sliding fit with the grinding wheel dresser (15), and an elastic device (13) is arranged between the grinding wheel dresser (15) and the rotary driving cylinder (14); the grinding wheel dresser is characterized in that a shell (12) capable of rotating relative to the rotary driving cylinder (14) is sleeved outside the rotary driving cylinder (14), a driving motor (11) is arranged on one side end face of the shell (12), an extending end of the driving motor (11) is connected with the rotary driving cylinder (14) to drive the rotary driving cylinder (14) to rotate, an end cover (17) with a central hole is arranged on the other side end face of the shell (12), and an extending end of the grinding wheel dresser (15) can penetrate through the central hole of the end cover (17).

2. The ball grinding wheel in-situ dressing device (1) according to claim 1, characterized in that: the shell (12) is provided with an adapter flange face (121), and a plurality of threaded holes are formed in the adapter flange face (121).

3. The ball grinding wheel in-situ dressing device (1) according to claim 1, characterized in that: the inner side wall of the shell (12) is in clearance fit with the outer side wall of the rotary driving cylinder (14) or a group of bearings (16) are arranged between the inner side wall of the shell (12) and the outer side wall of the rotary driving cylinder (14), and the number of the bearings (16) is at least 2.

4. The ball grinding wheel in-situ dressing device (1) according to claim 3, characterized in that: the end face of the shell (12) is provided with a center hole, the end part of the rotary driving cylinder (14) is provided with a shaft head (143), and the shaft head (143) penetrates through the center hole of the end face of the shell (12) and is in clearance fit with the center hole.

5. The ball grinding wheel in-situ dressing device (1) according to claim 4, characterized in that: a first sealing device (18) is arranged between the side wall of the shaft head (143) and the side wall of the center hole of the end surface of the shell (12).

6. The ball grinding wheel in-situ dressing device (1) according to claim 1, characterized in that: and a second sealing device (19) is arranged between the side wall of the central hole of the end cover (17) and the side wall of the grinding wheel dresser (15).

7. The ball grinding wheel in-situ dressing device (1) according to claim 1, characterized in that: the grinding wheel dresser (15) comprises a connecting plate (151) and a dressing barrel (152) which are fixedly connected in sequence, wherein at least one protrusion (1511) is arranged on the connecting plate (151) in the circumferential direction, and a long-strip-shaped groove (141) matched with the protrusion (1511) is formed in the inner wall of the rotary driving cylinder (14).

8. The ball grinding wheel in-situ dressing device (1) according to claim 1, characterized in that: the elastic device (13) is a spring, an oil buffer, a pneumatic buffer or a spring plate.

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