CN105643463B - Ultrasonic vibration cup wheel trimmer for repairing super-abrasive grinding wheel - Google Patents

Abstract

Ultrasonic vibrating cup-type grinding wheel dresser for dressing superabrasive grinding wheels, including an ultrasonic generator and a base; the base is equipped with a frequency conversion motor and a cylinder, the center line of the cylinder is set along the vertical direction, and the upper end of the cylinder is The blue is connected with a cover plate; a hollow shaft with an open upper end and a closed lower end is arranged coaxially in the cylinder body, a bearing is provided between the inner wall of the cylinder and the outer wall of the hollow shaft, and the frequency conversion motor is connected to the lower end of the hollow shaft; There are ultrasonic transducers and horns inside the shaft, and the outside of the horn is fixed on the hollow shaft through a detachable connection structure. The upper end of the horn passes through the cover plate and is coaxially fixed with a top open cup-shaped grinding wheel. . The invention provides ultrasonic vibration in the direction of the axis, which can improve the microscopic appearance of the trimmed grinding wheel well, complete the trimming of the abrasive grains at the same time as the trimming is completed, which is beneficial to reduce grinding heat and power consumption, and avoid grinding wheel clogging and Repair burns and increase the life of the external grinding wheel.

Description

Ultrasonic Vibrating Cup Dresser for Dressing Superabrasive Grinding Wheels

technical field

The invention belongs to the technical field of precision grinding, and in particular relates to an ultrasonic vibrating cup-type grinding wheel dresser for dressing superhard abrasive grinding wheels.

Background technique

The key to grinding wheel dressing is to obtain high precision and good shape. Micropowder superabrasive grinding wheel has a dense internal structure and fine abrasive grains. It is difficult to achieve the ideal shape of the grinding wheel by traditional dressing methods, and the dressing efficiency is low and the quality is unstable. With the ordinary dressing method, the dressing tool head and the grinding wheel wear quickly, and the labor intensity in the dressing process is high, the grinding wheel is easy to block, and defects such as dressing burns occur.

Ultrasonic machining is a material removal processing method that uses an acoustic system to convert electrical signals into ultrasonic small-amplitude vibrations. This method has small processing force, low processing temperature, small surface damage and residual stress, and is currently mainly used for external cylindrical ultrasonic cutting and grinding, and has not yet been used for dressing of superabrasive external cylindrical grinding wheels.

Contents of the invention

In order to solve the deficiencies in the prior art, the present invention provides an ultrasonic vibrating cup type for dressing superabrasive grinding wheels, which solves the problem of high dressing efficiency, uneasy blockage in the dressing process, high degree of automation, low labor intensity and high dressing precision. Wheel dresser.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions: an ultrasonic vibrating cup-type grinding wheel dresser for dressing superabrasive grinding wheels, including an ultrasonic generator and a base with a hollow structure inside; For the cylinder on the right side of the motor, the center line of the cylinder is set along the vertical direction, the lower end of the cylinder is flanged to the base, the upper flange of the cylinder is connected to a cover plate, and the cover plate and the cylinder are provided There is a sealing gasket; a hollow shaft with an open upper end and a closed lower end is arranged coaxially in the cylinder body, and there is a gap between the upper end of the hollow shaft and the lower surface of the cover plate.

The upper part between the inner wall of the cylinder and the outer wall of the hollow shaft is provided with a ball bearing, and the lower part between the inner wall of the cylinder and the outer wall of the hollow shaft is provided with a tapered roller bearing. There is a driven pulley, the driving pulley and the driven pulley are connected through a synchronous belt drive and are located inside the base;

The hollow shaft is equipped with an ultrasonic transducer and a horn, the lower end of the horn and the upper end of the ultrasonic transducer are connected by stud bolts, the outside of the horn is fixed on the hollow shaft through a detachable connection structure, and the cover plate A through hole is arranged on the top, and the upper end of the horn passes through the through hole upwards and is coaxially fixed with a cup-shaped grinding wheel with an open top.

The left side and the right side of the lower edge of the base are respectively provided with mounting plates, and the mounting plates are provided with mounting holes.

The top of the cover plate is provided with a groove that is coaxial with the through hole and larger in size than the through hole. In the groove, there is a felt that is sleeved outside the horn and is sealed with the horn. The felt is pressed to the press plate in the groove.

The detachable connection structure includes a step on the inner wall of the hollow shaft. A lower flange is provided on the step. The lower flange and the horn are an integral structure. The lower flange is provided with an upper flange. There is a positioning ring on the edge of the lower surface of the plate, the lower flange is located in the positioning ring, the upper flange and the lower flange are connected by fastening bolts, and the hollow shaft is connected to the upper flange by radially arranged fastening screws. Fixed connection.

The hollow shaft is provided with an inner positive electrode hole and an inner negative electrode hole located below the inner positive electrode hole. The outer wall of the hollow shaft is provided with an insulating sleeve. The outer wall of the insulating sleeve is provided with a positive electrode copper ring and a negative electrode copper ring located below the positive electrode copper ring. The positive electrode copper ring passes The inner positive wire passing through the inner positive hole is connected to the ultrasonic transducer, and the negative copper ring is connected to the ultrasonic transducer through the inner negative wire passing through the inner negative hole; The lower outer negative hole, the inner thread of the outer positive hole is connected with the upper guide tube, the inner thread of the outer negative hole is connected with the lower guide tube, the inner ends of the upper guide tube and the lower guide tube are open, and the outer ends of the upper guide tube and the lower guide tube are both provided There is a threading hole, and the upper guide tube is slid to be provided with an upper insulating sleeve with the same structure as the upper guide tube. The upper insulating sleeve is provided with a positive electrode carbon brush whose inner end is in pressure contact with the positive electrode copper ring. The upper spring is pressed against the outer end of the upper insulating sleeve and the inner wall of the outer end of the upper guide tube. The lower insulating sleeve with the same structure as the lower guide tube is slid inside the lower guide tube. The inner end of the lower insulating sleeve is pressed against the negative copper ring. The negative electrode carbon brush in contact, the lower guide tube is equipped with a lower spring with two ends that are respectively pressed against the outer end of the lower insulating sleeve and the inner wall of the outer end of the lower guide tube, the outer end of the positive electrode carbon brush is connected to the outer positive electrode wire, and the outer end of the negative electrode carbon brush An external negative electrode wire is connected, and both the external positive electrode wire and the external negative electrode wire are connected to the ultrasonic generator.

Cup wheels are made of diamond abrasives or SiC abrasives.

The lower surface of the cover plate is provided with a limit ring that is pressed against the ball bearing to limit the position.

By adopting the above-mentioned technical scheme, the base mainly plays the functions of fixing and supporting. The invention is installed on the workbench of a surface grinder or a tool grinder through the mounting holes on the mounting plate, and the mounting plates on both sides of the bottom of the base are planes, which can ensure that the system can be reliably installed on the magnetic suction cup of the surface grinder. The mounting holes can be fixed and installed on the workbench of the tool grinder through bolts;

The variable frequency motor is installed on the upper plane of the base through bolts. The torque output by the variable frequency motor can be transmitted to the vertically arranged hollow shaft through the synchronous belt, and then the rotational power is transmitted to the ultrasonic transducer and the horn installed in the hollow shaft. ;The frequency conversion motor can easily realize the function of changing the speed and direction of rotation. Compared with the traditional gear transmission system, it can not only realize stepless speed change, but also greatly simplify the structure, reduce maintenance work, and improve system reliability.

The cup-shaped grinding wheel is installed on the upper end of the horn and fastened by threaded connection; the electric energy output by the ultrasonic generator is transmitted to the ultrasonic transducer through the brush and copper ring, and the mechanical energy generated by the ultrasonic vibration is excited, and the ultrasonic vibration is transmitted through the horn. After the rod is enlarged, it is output to the cup-shaped grinding wheel; the hollow shaft is installed inside the cylinder through ball bearings and tapered roller bearings, and the tapered roller bearings can offset the self-weight of the ultrasonic vibration system and the axial force during dressing of the grinding wheel; The upper part of the base is fastened by bolts and positioned by pins.

Install the present invention on the magnetic chuck or workbench of the grinding machine, when the outer circular grinding wheel of the grinding machine needs to be shaped and sharpened after working for a period of time, move the cup-shaped grinding wheel of the present invention to the bottom of the outer circular grinding wheel, and select a suitable cup-shaped grinding wheel Turn on the speed of the grinding wheel, turn on the power supply of the frequency conversion motor and the ultrasonic transducer, and control the reciprocating movement of the outer grinding wheel on the upper part of the cup-shaped grinding wheel with an appropriate grinding amount to realize the dressing of the outer cylindrical grinding wheel; while the cup-shaped grinding wheel is rotating, it also provides Ultrasonic vibration in the axial direction can improve the microscopic appearance of the dressed grinding wheel, complete the dressing and sharpening of the abrasive grains at the same time, which is beneficial to reduce grinding heat and power consumption, and avoid grinding wheel clogging and dressing burns. Improve the life of the external grinding wheel.

In summary, the present invention has the following technical effects:

1. The present invention has an independent power system to provide power for the rotation of the cup-shaped grinding wheel.

2. It can be easily installed on the grinding machine, and the position of the cup-shaped grinding wheel can be adjusted through the feeding of the grinding machine, so that the cup-shaped grinding wheel can achieve a suitable grinding amount and ensure sufficient rigidity of the grinding system to meet the grinding wheel dressing requirements.

3. The ultrasonic vibration generated by the inverse piezoelectric effect of piezoelectric ceramics can be used to assist, which can improve the microscopic appearance of the grinding wheel after dressing, and complete the sharpening of the abrasive grains while completing the shaping, which is beneficial to reduce the grinding heat and power consumption, avoiding the clogging of the grinding wheel and dressing burns, and improving the life of the grinding wheel.

4. The use of the present invention to dress the outer round grinding wheel does not need to be disassembled, which greatly reduces the workload of the operator when dressing the grinding wheel and improves the dressing efficiency.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the enlarged view of place A in Fig. 1;

FIG. 3 is a top view of FIG. 1 .

detailed description

As shown in Fig. 1, Fig. 2 and Fig. 3, the ultrasonic vibrating cup type grinding wheel dresser for dressing superabrasive grinding wheel of the present invention comprises ultrasonic generator 1 and the base 2 that the inside is hollow structure; Base 2 is provided with The variable frequency motor 3 and the cylindrical body 4 located on the right side of the variable frequency motor 3, the centerline of the cylindrical body 4 is arranged along the vertical direction, the lower end flange of the cylindrical body 4 is connected to the base 2, and the upper end flange of the cylindrical body 4 is connected with The cover plate 5 is provided with a gasket 6 between the cover plate 5 and the cylinder body 4; the cylinder body 4 is coaxially provided with a hollow shaft 7 with an open upper end and a blocked lower end, and the upper end of the hollow shaft 7 is connected to the cover plate 5 The lower surface has a gap,

The upper part between the inner wall of the cylindrical body 4 and the outer wall of the hollow shaft 7 is provided with a ball bearing 8, the lower part between the inner wall of the cylindrical body 4 and the outer wall of the hollow shaft 7 is provided with a tapered roller bearing 9, and the lower end of the main shaft of the frequency conversion motor 3 is provided with The driving pulley 10 is provided with a driven pulley 11 at the lower end of the hollow shaft 7, and the driving pulley 10 and the driven pulley 11 are connected by a synchronous belt 50 and are all located inside the base 2;

The hollow shaft 7 is provided with an ultrasonic transducer 12 and a horn 13, the lower end of the horn 13 and the upper end of the ultrasonic transducer 12 are connected by stud bolts 14, and the outer horn 13 is fixed by a detachable connection structure. On the hollow shaft 7 , the cover plate 5 is provided with a through hole 15 , and the upper end of the horn 13 passes through the through hole 15 and is coaxially fixed with a top open cup-shaped grinding wheel 16 .

The left side and the right side of the lower edge of the base 2 are respectively provided with a mounting plate 17, and the mounting plate 17 is provided with a mounting hole 18.

The top of the cover plate 5 is provided with a groove coaxial with the through hole 15 and larger in size than the through hole 15. The groove is provided with a felt 19 that is sleeved outside the horn 13 and is sealingly connected with the horn 13. The felt 19 can be To prevent dust and sundries from entering the cylindrical body 4 , the cover plate 5 is provided with a pressing plate 21 for pressing the felt 19 into the groove through mounting screws 20 .

The detachable connection structure includes a step set on the inner wall of the hollow shaft 7, and a lower flange 22 is arranged on the step, the lower flange 22 and the horn 13 are an integral structure, and the lower flange 22 is provided with an upper flange Plate 23, the edge of the lower surface of the upper flange 23 is provided with a positioning ring 24, the lower flange 22 is located in the positioning ring 24, the upper flange 23 and the lower flange 24 are connected by fastening bolts 51, the hollow shaft 7 is fixedly connected with the upper flange 23 through radially arranged fastening screws 25 .

The hollow shaft 7 is provided with an inner positive pole hole 26 and an inner negative pole hole 27 positioned below the inner positive pole hole 26. The outer wall of the hollow shaft 7 is provided with an insulating sleeve 28. Negative electrode copper ring 30, positive electrode copper ring 29 is connected with ultrasonic transducer 12 by passing through inner positive electrode lead 31 of inner positive electrode hole 26, and negative electrode copper ring 30 is passed through inner negative electrode lead 32 of inner negative electrode hole 27 and ultrasonic transducer connected with device 12; cylinder body 4 is provided with an outer positive pole hole and an outer negative pole hole located below the outer positive pole hole, the outer positive pole hole is internally threaded with an upper guide tube 33, and the outer negative pole hole is internally threaded with a lower guide tube 34. The inner ends of the guide tube 33 and the lower guide tube 34 are open, and the outer ends of the upper guide tube 33 and the lower guide tube 34 are provided with threading holes, and the upper guide tube 33 is slidably provided with an upper insulating sleeve 35 with the same structure as the upper guide tube 33 , the upper insulating sleeve 35 is provided with a positive electrode carbon brush 36 whose inner end is in pressure contact with the positive electrode copper ring 29, and the upper guide tube 33 is provided with two ends respectively connected to the outer end of the upper insulating sleeve 35 and the inner wall top of the upper guide tube 33 outer end. The press-fit upper spring 37, the lower guide tube 34 is slidingly provided with a lower insulating sleeve 38 with the same structure as the lower guide tube 34, and the lower insulating sleeve 38 is provided with a negative electrode carbon brush 39 whose inner end is in pressure contact with the negative electrode copper ring 30 , the lower guide tube 34 is provided with a lower spring 40 with two ends respectively pressed against the outer end of the lower insulating sleeve 38 and the inner wall of the outer end of the lower guide tube 34, the outer end of the positive carbon brush 36 is connected with an outer positive lead 41, and the negative carbon brush The outer end of 39 is connected with an external negative electrode lead 42, and both the external positive electrode lead 41 and the external negative electrode lead 42 are connected with the ultrasonic generator 1.

Cup wheel 16 is made of diamond abrasive or SiC abrasive.

The lower surface of the cover plate 5 is provided with a limit ring 43 that presses against the ball bearing 8 to limit the position, and the limit ring 43 and the cover plate 5 adopt an integrally formed structure.

Base 2 mainly plays the functions of fixing and supporting. The present invention is installed on the workbench of a surface grinder or a tool grinder through the mounting hole 18 on the mounting plate 17, and the mounting plates 17 on both sides of the bottom surface of the base 2 are planes, which can ensure that the system can be reliably installed on the magnetic chuck of the surface grinding machine. The mounting hole 18 can be fixedly installed by bolts on the workbench of the tool grinder;

The frequency conversion motor 3 is installed on the upper plane of the base 2 through bolts. The torque output by the frequency conversion motor 3 can be transmitted to the vertically arranged hollow shaft 7 through the synchronous belt 50, and then the rotational power is transmitted to the ultrasonic transducer installed in the hollow shaft 7. On the gear 12 and the horn 13; the frequency conversion motor 3 can conveniently realize the function of changing the speed and direction of rotation. Compared with the traditional gear transmission system, it can not only realize stepless speed change, but also greatly simplify the structure and reduce maintenance work. Improve system reliability.

The cup-shaped grinding wheel 16 is installed on the upper end of the horn 13, and is fastened through a threaded connection; the electric energy output by the ultrasonic generator 1 is transmitted to the ultrasonic transducer 12 through a brush and a copper ring, and is excited to generate mechanical energy of ultrasonic vibration. , which is amplified by the horn 13 and output to the cup-shaped grinding wheel 16; the hollow shaft 7 is installed inside the cylinder 4 through the ball bearing 8 and the tapered roller bearing 9, and the tapered roller bearing 9 can offset the self-weight of the ultrasonic vibration system and the grinding wheel Axial force during trimming; the cylindrical body 4 is installed on the upper part of the base 2 and fastened by bolts, and is positioned by pins.

Install the present invention on the magnetic chuck or the workbench of the grinding machine, when the cylindrical grinding wheel of the grinding machine needs to be shaped and sharpened after working for a period of time, move the cup-shaped grinding wheel 16 of the present invention to the bottom of the cylindrical grinding wheel, and select a suitable cup 16 rotating speeds of the shaped grinding wheel, turn on the power supply of the frequency conversion motor 3 and the ultrasonic transducer 12, and control the outer round grinding wheel to reciprocate on the top of the cup-shaped grinding wheel 16 with a suitable amount of grinding to realize the trimming of the outer round grinding wheel; the cup-shaped grinding wheel 16 is At the same time of rotation, it also provides ultrasonic vibration in the direction of the axis, which can improve the microscopic appearance of the dressing wheel, complete the dressing and sharpening of the abrasive grains at the same time, which is beneficial to reduce the grinding heat and power consumption, avoiding the Grinding wheel clogging and dressing burn, improve the life of the external grinding wheel.

The above embodiments are only used to illustrate and not limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that the present invention can still be modified or equivalently replaced without departing from it. Any modifications or partial replacements within the spirit and scope of the present invention shall fall within the scope of the claims of the present invention.

Claims (5)

1. the ultrasonic vibration cup wheel trimmer for repairing super-abrasive grinding wheel, it is characterised in that：Occur including ultrasonic wave Device and the internal base in hollow structure；Base is provided with variable-frequency motor and the cylinder on the right side of variable-frequency motor, cylinder Center line be arranged in vertical, end flanges are connected on base under cylinder, and cylinder upper flanges are connected with cover plate, lid Sealing gasket is provided between plate and cylinder；In cylinder in the coaxial hollow shaft provided with upper end opening, lower end closure, hollow shaft End has gap with cover plate lower surface,

Top between cylinder inwall and hollow shaft outer wall is provided with ball bearing, between cylinder inwall and hollow shaft outer wall Bottom is provided with taper roll bearing, and the main shaft lower end of variable-frequency motor is provided with driving pulley, and hollow shaft lower end is provided with driven pulley, main Movable belt pulley and driven pulley are connected by toothed belt transmission and are respectively positioned on chassis interior；

Ultrasonic transducer and ultrasonic transformer are provided with hollow shaft, double end is passed through between ultrasonic transformer lower end and ultrasonic transducer upper end Fixed and be located in hollow shaft by Detachable connection structure outside bolt connection, ultrasonic transformer, cover plate is provided with through hole, ultrasonic transformer End is upward through through hole and is coaxially fixed with open top cup wheel；

The left side and right side of base lower edge are respectively equipped with installing plate, and installing plate is provided with mounting hole；

Be provided with the top of cover plate in the groove for being more than through hole with through hole coaxial line and size, groove provided be enclosed on ultrasonic transformer it is outer and with change Pressing plate felt being pressed onto in groove is provided with by mounting screw on the felt that width bar is tightly connected, cover plate.

2. the ultrasonic vibration cup wheel trimmer according to claim 1 for being used to repair super-abrasive grinding wheel, its feature It is：Detachable connection structure includes the step opened up on inner wall of hollow shaft, and step is provided with lower flange, and lower flange is with becoming Width bar is integral structure, and lower flange is provided with upper flange plate, and upper flange plate lower surface edge is provided with locating ring, lower flange In locating ring, connected between upper flange plate and lower flange by fastening bolt, hollow shaft passes through the fastening that is radially arranged Screw is fixedly connected with upper flange plate.

3. the ultrasonic vibration cup wheel trimmer according to claim 1 for being used to repair super-abrasive grinding wheel, its feature It is：Hollow shaft is provided with interior positive pole hole and the interior negative pole hole below interior positive pole hole, and hollow shaft outer wall is provided with insulation sleeve, absolutely Edge set outer wall is provided with positive pole copper ring and the negative pole copper ring below positive pole copper ring, and positive pole copper ring passes through through in interior positive pole hole Positive wire is connected with ultrasonic transducer, and negative pole copper ring passes through the interior cathode conductor and ultrasonic transducer through interior negative pole hole Connection；Cylinder is provided with outer positive pole hole and the outer negative pole hole below outer positive pole hole, and outer positive pole hole internal thread is connected with Guide pipe, outer negative pole hole internal thread is connected with lower guide pipe, and upper guide pipe and lower guide pipe are inner open, and upper guide pipe is led with It is equipped with threading hole, upper guide pipe to slide to pipe outer end and is provided with and insulation sleeve, upper insulation sleeve in upper guiding tubular construction identical It is interior provided with inner positive pole carbon brush contact with positive pole copper ring top pressure, upper guide pipe is interior be provided with two ends respectively with upper insulation sleeve outer end and Slide and be provided with being insulated under lower guiding tubular construction identical in the upper spring that upper guide pipe outer end inner wall top pressure coordinates, lower guide pipe Set, provided with inner negative pole carbon brush contact with negative pole copper ring top pressure in lower insulation sleeve, lower guide pipe is interior to be provided with two ends respectively with The lower spring that insulation sleeve outer end and lower guide pipe outer end inner wall top pressure coordinate, positive pole carbon brush outer end is connected with outer positive wire, bears Pole carbon brush outer end is connected with outer cathode conductor, and outer positive wire and outer cathode conductor are connected with supersonic generator.

4. the ultrasonic vibration cup wheel trimmer according to claim 1 for being used to repair super-abrasive grinding wheel, its feature It is：Cup wheel is made up of diamond abrasive or SiC abrasive materials.

5. the ultrasonic vibration cup wheel trimmer according to claim 1 for being used to repair super-abrasive grinding wheel, its feature It is：Cover plate lower surface is provided with the spacing ring spacing with ball bearing top pressure.