CN114654383A - Precise trimming method for concave arc metal bond diamond grinding wheel - Google Patents
Precise trimming method for concave arc metal bond diamond grinding wheel Download PDFInfo
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- CN114654383A CN114654383A CN202210406994.1A CN202210406994A CN114654383A CN 114654383 A CN114654383 A CN 114654383A CN 202210406994 A CN202210406994 A CN 202210406994A CN 114654383 A CN114654383 A CN 114654383A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B53/00—Devices or means for dressing or conditioning abrasive surfaces
- B24B53/001—Devices or means for dressing or conditioning abrasive surfaces involving the use of electric current
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
- B24B49/12—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation involving optical means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B53/00—Devices or means for dressing or conditioning abrasive surfaces
- B24B53/06—Devices or means for dressing or conditioning abrasive surfaces of profiled abrasive wheels
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Grinding-Machine Dressing And Accessory Apparatuses (AREA)
Abstract
The invention provides a precise trimming method for a concave arc metal bond diamond grinding wheel. The method comprises the following steps: step 1, mounting of a grinding wheel: the grinding wheel to be repaired is connected with a discharge anode, the cutter wheel is connected with a discharge cathode, and the repair cutter wheel is arranged on the repair main shaft, so that the installation accuracy of each wheel is ensured; step 2, determining a rough trimming and fine trimming area: taking the area contained by the sum of the discharging gap of the standard profile shifted inwards for fine finishing and the average grain size of the abrasive grains of the grinding wheel to be finished as a fine finishing area, and taking the rest as a rough finishing area; step 3, repairing the cutter wheel, namely repairing the contour shape of the cutter wheel by using the repaired cutter wheel to ensure that the contour shape of the cutter wheel is well matched with the contour of a standard cutter wheel; step 4, rough trimming: selecting larger discharge parameters and grinding depth, and removing materials in the rough trimming area; step 5, fine finishing: and selecting smaller discharge parameters and grinding depth to remove materials in the finishing area, and the method realizes the high-efficiency and high-precision finishing of the coarse-grained diamond forming grinding wheel.
Description
Technical Field
The invention relates to a method for dressing a superhard abrasive grinding wheel, in particular to a method for dressing a concave arc metal bond diamond grinding wheel;
background
At present, hard and brittle materials such as hard and brittle materials, nonferrous metals, hard alloys, optical glass, ceramics, precious stones and the like which are difficult to process are generally ground by adopting a diamond grinding wheel; the metal bond grinding wheel is widely applied in production due to the remarkable characteristics of high bonding strength, good formability, long service life and the like. Dressing of the formed grinding wheel required for the above difficult-to-machine materials and complex profile parts is a technical problem in the field of grinding machining.
In the form grinding, a key technique for determining the grinding accuracy is dressing of a diamond-formed grinding wheel. And the removal of diamond abrasive particles is critical in dressing the formed wheel. At present, mechanical methods, electrical processing methods and laser methods are widely used in the industry as methods for dressing diamond grinding wheels. The mechanical method mainly comprises a turning finishing method, a rolling finishing method, a mechanical grinding finishing method and the like; the electromachining methods mainly include electrolytic dressing, electric spark dressing, etc. The laser method mainly includes a nanosecond pulse laser trimming method, a picosecond pulse laser trimming method and the like. Although mechanical and electrical machining methods are currently used to some extent in the grinding field, problems and limitations still exist during use. Such as: when the formed grinding wheel is dressed by a mechanical method, the dressing tool has large loss, high dressing cost, easy breakage or falling of abrasive particles, difficult guarantee of dressing precision and the like because of large mechanical acting force between the dressing tool and the dressed grinding wheel; when the formed grinding wheel is dressed by the electric machining method, the defects of low dressing efficiency (mainly removing the binder material due to non-conductivity of the diamond abrasive particles, namely low shaping efficiency), narrow application range (only being suitable for dressing the micro-powder binder grinding wheel due to incapability of directly removing the diamond abrasive particles, and incapable of precisely dressing the coarse-grained formed grinding wheel), equipment and environment friendliness (the used mediums such as electrolyte, grinding fluid and the like easily cause equipment corrosion and environmental pollution) and the like exist. The laser trimming method has wide applicability, is not influenced by processing media and processing materials, and is a shaping grinding wheel trimming technology with great development potential. However, the size of the light spot is not changed within a short focal depth range under the influence of the characteristics of the Gaussian laser beam, so that the size of the light spot irradiated on the surface of the grinding wheel and the laser energy are changed along with the profile of the grinding wheel to be shaped. Furthermore, lasers of the same energy do not provide the same amount of binder material and abrasive particles to be removed. Therefore, it is difficult to perform high-precision dressing of the formed grinding wheel by the laser dressing method.
The electric spark dressing grinding wheel technology is used as an effective dressing method, can avoid the contact between a dressing tool and superhard abrasive particles, and is widely applied to dressing a metal bond diamond grinding wheel. But is limited by the size of the discharge gap and the conductivity of the diamond grit and is not suitable for dressing in coarse grain formed wheels. The traditional hard-to-hard mechanical grinding and finishing method has the defects of abrasion of a finishing cutter, low finishing efficiency, easy falling of abrasive particles of a grinding wheel, high requirement on finishing equipment and the like, and cannot ensure the stability of finishing precision. For dressing of shaped diamond wheels, precise removal of portions of diamond grit is required to improve the wheel profile accuracy. The existing dressing method is difficult to give consideration to dressing efficiency and dressing precision, and a high-quality and high-efficiency dressing method of the diamond-shaped grinding wheel is necessary to be invented. The electric spark grinding integrated dressing method combining electric spark dressing and mechanical grinding dressing can give full play to respective advantages and realize high-quality and high-efficiency dressing of the formed grinding wheel.
At present, relevant patents and relevant documents about the metal bond diamond forming diamond grinding wheel spark grinding integrated finishing method are not found.
Disclosure of Invention
The invention aims to provide an electric spark grinding integrated dressing method of a concave arc metal bond diamond grinding wheel, which is simple, convenient, feasible, high in efficiency and high in precision, and solves the technical problem that the dressing efficiency of the existing formed diamond grinding wheel is low. The dressing method combines an electric spark dressing method and a mechanical grinding dressing method, fully combines the advantages of the two dressing methods, and realizes high-quality and high-efficiency dressing of the formed grinding wheel.
The technical scheme of the invention provides a precise trimming method for a concave arc metal bond diamond-formed grinding wheel, which is characterized by comprising the following steps of:
step 1, mounting of a grinding wheel: installing a grinding wheel to be repaired and a cutter wheel on two main shafts of a machine tool, installing a repair cutter wheel on the repair main shaft, connecting an output positive pole of a high-frequency pulse direct-current power supply with the grinding wheel to be repaired, and connecting an output negative pole with the cutter wheel, so as to ensure the installation accuracy of the grinding wheel to be repaired and the cutter wheel;
step 2, determining a rough trimming and fine trimming area: according to the size of a concave arc grinding wheel to be dressed, firstly determining the area of a grinding material layer to be removed in the fine dressing process; the fine trimming area is an area contained by the standard outline which is deviated to the direction of the circle center of the standard outline by a certain distance, the deviation is the discharge gap under the fine trimming discharge parameter plus the average grain diameter value of the abrasive grains of the grinding wheel to be trimmed, and the rest areas of the grinding layer to be removed are coarse trimming areas;
step 3, finishing the cutter wheel: shooting the rotating outline shape of the cutter wheel in real time through a CCD detection device, and leading in the outline of a standard cutter wheel by detection software to be compared with the outline of the current cutter wheel in real time; the contour shape of the cutter wheel is trimmed by a reworked cutter wheel, so that the cutter wheel is well matched with the contour of a standard cutter wheel;
step 4, rough trimming: trimming the cutter point part of the cutter wheel into a rectangle, dividing the rough trimming area into a plurality of small rectangular areas according to the size of the rough trimming area, sequentially removing abrasive material layers in the small rectangular areas layer by layer, then finding out the maximum trimming amount according to an arc trimming path, and respectively designing a numerical control program for trimming 1/4 arc paths by using the left corner and the right corner of the cutter wheel; selecting larger discharge parameters and grinding depth, and removing the abrasive layer in the rough trimming area in the step 2; returning to the step 3 to repair the cutter wheel if the profile loss of the cutter wheel exceeds 20 micrometers during finishing;
step 5, fine finishing: the cutter point part of the cutter wheel is trimmed into a convex arc shape, and a trimming numerical control program of a complete semi-circular arc profile is designed according to the radius of the convex arc on the cutter wheel; selecting smaller discharge parameters and grinding depth, and removing the abrasive layer in the finishing area in the step 2; returning to the step 3 to repair the cutter wheel if the profile loss of the cutter wheel exceeds 10 micrometers during finishing; and continuing fine finishing until the finally finished contour is well matched with the contour size to be finished, and finishing to obtain the concave circular arc grinding wheel.
Further, in the step 3, the step 4 and the step 5, the profile of the grinding wheel to be trimmed and shaped and the real-time profile trimmed by the grinding wheel can be compared on a reflected screen, and the trimming allowance is determined.
Further, the metal-based diamond grinding wheel to be repaired is connected with a discharge anode of an electric spark power supply through a graphite electrode, the cutter wheel is connected with a discharge cathode of the electric spark power supply through the graphite electrode, and a discharge medium adopts compressed air.
Furthermore, the cutter wheel is provided with an additional rotating mechanism, so that the cutter wheel can rotate in a range of-90 degrees to 90 degrees, and the angle is randomly converted according to the position relation between the cutter wheel and the grinding wheel to be dressed to dress the formed grinding wheel.
Further, the cutter wheel is worn in the trimming process, in order to ensure high precision of the grinding wheel profile to be trimmed and formed, the cutter wheel needs to be repaired, the trimming amount to be removed according to needs and whether interference can occur between the cutter wheel and the grinding wheel profile, the position is adjusted by using an additional rotating mechanism of the cutter wheel, the shape of the cutter wheel is trimmed, and efficient trimming of the shape of the required cutter wheel is achieved.
Furthermore, the trimming of the concave arc grinding wheel and the repair of the cutter wheel are automatically finished by compiling a numerical control program.
Compared with the prior art, the trimming method has the advantages that:
the dressing of the formed grinding wheel is realized efficiently. Spark dressing and mechanical grinding dressing each exhibit good dressing advantages and promote each other. The electric spark discharge in rough finishing can remove the metal bond and the abrasive grain material, and simultaneously, the heat influence also causes partial bond and abrasive grain material to be softened. The softened binder and abrasive material can be conveniently removed by mechanical grinding. The metal bond with higher protruding height on the surface of the grinding wheel can be ground flat by mechanical grinding, so that the molten metal bond material can slightly cover the surface of the abrasive particles, the surface of the abrasive particles has better conductivity, and the electric spark discharge removal on the abrasive particles is realized. This can greatly improve dressing efficiency of the formed grinding wheel.
The grinding wheel has good surface appearance and excellent grinding performance. In the fine finishing, the electric spark discharges to remove the binder material, so that the abrasive particles have a certain protruding height, the mechanical grinding is used for slightly removing part of the diamond abrasive particles to finish the formed profile, and the deteriorated layer on the surface of the abrasive particles of the grinding wheel is ground, so that the finishing precision of the formed grinding wheel is improved, the surface appearance of the grinding wheel is better, and the excellent grinding performance of the grinding wheel can be exerted.
Green and environment-friendly, simple and easy to implement. The method can be realized in the air without using environment-friendly liquid media such as oil, grinding fluid, emulsion and the like. In addition, the feeding of the discharge gap is realized without using a complex control system, and the operation is simple.
According to the method, a layer of metal bonding agent is partially and thinly covered on the diamond to be trimmed, so that the non-conductive diamond abrasive particles can be conductive, and the diamond abrasive particles on the wheel to be trimmed can be directly removed through discharging; therefore, the dressing efficiency is greatly improved, and the abrasion of the cutter wheel is reduced while the dressing precision is ensured.
Drawings
FIG. 1 is a schematic diagram illustrating the discharge removal principle of diamond abrasive particles in the electric spark grinding and finishing method of the present invention;
FIG. 2 is a schematic view of a concave arc grinding wheel dressing structure according to the present invention;
FIG. 3 is a schematic representation of a rough dressing and truing scheme for a concave circular arc grinding wheel according to the present invention;
FIG. 4 is a schematic representation of a concave circular arc grinding wheel finishing dressing scheme of the present invention;
FIG. 5 is a diagram of a grinding wheel before and after dressing taken by the CCD detection device of the present invention;
FIG. 6 is a diagram of the CCD detection device shooting the condition of the repair when the cutter wheel is repaired according to the present invention;
FIG. 7 is a diagram of the profile of the grinding wheel after rough finishing of the concave circular arc grinding wheel according to the present invention;
FIG. 8 is a graph showing the effect of diamond grit discharge removal in the spark erosion grinding process of the present invention;
fig. 9 is a diagram of the cutter wheel shape of the present invention.
Detailed Description
The technical solution of the present invention will be described in detail with reference to the accompanying fig. 1-9.
The embodiment provides a precise trimming method for a concave arc metal bond diamond grinding wheel. Because the diamond abrasive particles are not conductive, the diamond abrasive particles on the grinding wheel can be locally softened under the heat influence of electric spark discharge, and the abrasive particles can be removed in a trace manner under the action of the discharge explosion force. Mechanical grinding can cause the removal of the plow by squeezing the diamond grit on the wheel, but can cause significant wear on the cutter wheel. For dressing of shaped wheels, precise removal of the abrasive layer (binder and abrasive particles) is required to obtain the desired shaped wheel profile.
The integrated electric spark grinding finishing method has the advantage that the diamond abrasive particles can be removed by discharging when proper technological parameters are selected. The diamond abrasive particles are not conductive, but the mechanical grinding can plough and roll up the metal binder material on the grinding wheel to be repaired or grind away the protruding diamond abrasive particles on the surface of the grinding wheel to be repaired, the electric spark discharges to quickly melt or vaporize the metal binder material on the surface of the grinding wheel to be repaired, and the molten metal binder material can cover a thin layer on the surface of the diamond abrasive particles due to splashing, flowing or rotation of the grinding wheel, so that the non-conductive diamond abrasive particles can be conductive, and the discharge removal of the diamond abrasive particles can be realized. In addition, the thermal influence of the discharge action of the peripheral bond material causes local areas of the diamond abrasive particles to soften (oxidize or convert into graphite), facilitating the removal by mechanical grinding. This can reduce wear of the cutter wheel while ensuring dressing accuracy. Meanwhile, under the influence of the electric spark discharge polarity effect, the energy absorbed by the discharge anode is more than that absorbed by the discharge cathode. In the electric spark grinding and finishing process, the binding agent and the abrasive grain material used by the grinding wheel to be finished and the cutter wheel are the same, the grinding wheel to be finished is connected with a discharge anode, so that more spark discharge energy is absorbed, and the binding agent and the abrasive grain material in the grinding wheel connected with the anode can be quickly removed; and the cutter wheel connected with the negative electrode absorbs less spark discharge energy, so that the damage to the contour precision of the cutter wheel is reduced. In addition, the defects of recast layers, altered layers and the like caused by electric spark dressing can be removed by mechanical grinding, the defects of grinding wheel deformation and the like caused by the crushing and falling of abrasive particles and large extrusion force which are easily caused by mechanical grinding dressing can be reduced or eliminated. Therefore, the two dressing methods are integrated and combined, the advantages of electric spark dressing are fully utilized, the high surface appearance quality and the profile precision stability of the dressing by a mechanical grinding method are kept, electric spark discharge on diamond abrasive particles is increased, the respective defects of the two dressing methods can be reduced or eliminated, the two dressing methods are mutually promoted, the advantages and the disadvantages are improved, and the high-efficiency and high-precision dressing of the diamond-formed grinding wheel is realized.
Precision dressing of the formed wheel requires removal of excess binder and abrasive material. Because the different thermophysical properties of the binding agent and the abrasive grain material are different, the difference is caused by the heat influence of the electric spark action, different discharge parameters can be selected for acting, the material can be selectively removed, and the formed grinding wheel can be precisely trimmed. The diamond grains in the grinding wheel are not conductive but are affected by the heat of the peripheral spark action. It has been found that diamond grains react with oxygen in the air at 750 deg.c (about 1000K) and soften the diamond to affect the grinding performance. If the temperature continues to rise, to about 1600K, the diamond to graphite transition occurs, which results in a reduction in the strength and hardness of the abrasive particles in the wheel. However, due to the influence of the spark thermal effect, diamond softening or graphitization is removed only a little by the action of the discharge explosive force. This is also why spark dressing is not suitable for dressing coarse grain grinding wheels.
When the formed grinding wheel is ground and dressed by electric spark, under the condition of keeping a certain dressing allowance, a larger discharge energy and a grinding depth are selected for rough dressing, and the proper grinding depth enables the metal bond with higher surface protrusion of the grinding wheel to be dressed to be ground flat, so that the diamond abrasive particles can be covered by the molten metal bond, and the discharge removal of the diamond abrasive particles is realized. After rough finishing, the outline shape close to the grinding wheel needing to be formed can be obtained; and the fine finishing is carried out by selecting smaller discharge energy and grinding depth, the grinding depth in the fine finishing is smaller, so that the abrasive particles on the surface of the grinding wheel to be finished have certain protruding height, the molten metal bonding agent is less in dosage, and insufficient quantity can flow or splash to cover the diamond abrasive particles, the diamond abrasive particles are not conductive, and the better abrasive particles are reserved for grinding the finished formed grinding wheel. In the fine finishing, the electric spark discharges to remove the binder material, so that the abrasive particles have a certain protruding height, and the grinding wheel can exert excellent grinding performance; the smaller grinding depth is used for removing part of diamond abrasive grains to finish the formed profile, and the formed grinding wheel with high profile precision is obtained through finishing.
As shown in fig. 2, in the technical solution of the present invention, the discharge parameters selectable by the electric spark power supply are: open circuit voltage is 60V, 80V, 100V, 120V, peak current is 0-30A, pulse width is 0-500 mus, and pulse interval is 0-500 mus. And controlling the output of the power supply discharge parameters through a control system.
The embodiment provides a precise trimming method for a concave arc metal bond diamond grinding wheel, which specifically comprises the following steps:
step 1, installing a grinding wheel to be repaired and a cutter wheel on two main shafts of a machine tool, installing a repair cutter wheel on the repair main shaft, connecting an output positive pole of a high-frequency pulse direct-current power supply with the grinding wheel to be repaired, and connecting an output negative pole with the cutter wheel, so as to ensure the installation accuracy of the grinding wheel to be repaired and the cutter wheel, as shown in fig. 2 specifically.
And 2, according to the standard profile shape of the concave arc grinding wheel to be trimmed, shifting the standard profile inwards by a certain distance (the shift distance is the discharge gap under the discharge parameter of fine trimming plus the average grain diameter value of the grinding wheel abrasive grains to be trimmed), and determining the regions of the grinding layer to be removed by rough trimming and fine trimming (fig. 3 and 4). The profile of the grinding wheel to be dressed and the real-time profile of the grinding wheel dressing can be compared on a reflected screen to determine the dressing allowance (fig. 5).
Step 3, finishing the cutter wheel: the wear condition of the cutter wheel is reflected on a screen of a control system through real-time shooting of a CCD detection device, and detection software can be led into a standard contour to realize comparison with the current cutter wheel contour, which is specifically shown in FIG. 6. Determining the profile shape of the cutter wheel to be trimmed according to trimming conditions: in the rough trimming, the cutter wheel is trimmed into a rectangular profile, and in the fine trimming, the cutter wheel is trimmed into a convex arc profile. The tool wheel is dressed using a reworked tool wheel mechanical grinding dressing process.
Step 4, rough trimming: the edge part of the cutter wheel is trimmed into a rectangle, the rough trimming area is divided into a plurality of small rectangular areas, after the abrasive material layers in the small rectangular areas are sequentially removed layer by layer, the maximum trimming amount according to the arc trimming path is found, and a numerical control program (figure 3) for walking the arc trimming path from A → B and C → B by the corner of the cutter wheel is designed. Selecting larger discharge parameters and grinding depth (open-circuit voltage U is 120V, peak current I is 20-30A, pulse width 350-1300-2500-p6-10 μm), removing the abrasive layer in the area set in step 2, a grinding wheel close to the standard profile can be obtained. If the profile loss exceeds 20 μm, the step 3 is returned to carry out the trimming of the cutter wheel.
Step 5, fine finishing: the edge part of the cutter wheel is trimmed into a convex arc shape, and numerical control programs for trimming the arc from A → C and C → A by the cutter wheel are designed according to the radius of the convex arc on the cutter wheel (figure 4). Selecting smaller discharge parameters and grinding depth (open-circuit voltage U is 60/80V, peak current I is 2-10A, pulse width is 10-50 mus, pulse interval is 10-50 mus, rotating speed r of grinding wheel to be repaired1500-2500-p1-2 μm) and dressing the wheel along an arc path. If the profile loss exceeds 10 μm, the step 3 is returned to carry out the trimming of the cutter wheel.
FIG. 7 is a diagram showing the topography of the surface of the wheel to be dressed in rough spark-erosion grinding. It can be seen that a re-solidified layer of binder material covered the diamond grit and small pits were found electroeroded in the diamond grit (fig. 8), confirming that spark discharge occurred on the diamond grit.
The shape of the cutter wheel is shown in fig. 9, the rectangular profile of the cutter point part can be flexibly selected according to the size of the formed profile to be trimmed, and the preferred cutter point thickness is 0.6mm, 1mm, 2mm, 5mm and 10 mm.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and the detailed description of the specific implementation of the present invention is provided, but the above contents are only the preferred embodiments created by the present invention and should not be considered as limiting the implementation scope of the present invention. It will be understood by those skilled in the art that various modifications and equivalent arrangements may be made without departing from the spirit and scope of the present invention, which is to be covered by the appended claims.
Claims (6)
1. A precise dressing method for a concave arc metal bond diamond-formed grinding wheel is characterized by comprising the following steps:
step 1, mounting of a grinding wheel: installing a grinding wheel to be repaired and a cutter wheel on two main shafts of a machine tool, installing the repaired cutter wheel on the repaired main shaft, connecting an output positive pole of a high-frequency pulse direct-current power supply with the grinding wheel to be repaired, and connecting an output negative pole with the cutter wheel, so that the installation accuracy of the grinding wheel to be repaired and the cutter wheel is ensured;
step 2, determining a rough trimming and fine trimming area: according to the size of a concave arc grinding wheel to be dressed, firstly determining the area of a grinding material layer to be removed in the fine dressing process; the fine trimming area is an area contained by the standard outline which is deviated to the direction of the circle center of the standard outline by a certain distance, the deviation is the discharge gap under the fine trimming discharge parameter plus the average grain diameter value of the abrasive grains of the grinding wheel to be trimmed, and the rest areas of the grinding layer to be removed are coarse trimming areas;
step 3, finishing the cutter wheel: shooting the rotating outline shape of the cutter wheel in real time through a CCD detection device, and leading in the outline of a standard cutter wheel by detection software to be compared with the outline of the current cutter wheel in real time; the contour shape of the cutter wheel is trimmed by a reworked cutter wheel, so that the cutter wheel is well matched with the contour of a standard cutter wheel;
step 4, rough trimming: trimming the tool point part of the tool wheel into a rectangle, dividing the rough trimming area into a plurality of small rectangular areas according to the size of the rough trimming area, sequentially removing the abrasive material layers in the small rectangular areas layer by layer, then finding out the maximum trimming amount according to the circular arc trimming path, and respectively designing a numerical control program for trimming 1/4 circular arc paths by using the left corner and the right corner of the tool wheel; selecting larger discharge parameters and grinding depth, and removing the abrasive layer in the rough trimming area in the step 2; returning to the step 3 to repair the cutter wheel if the profile loss of the cutter wheel exceeds 20 micrometers during finishing;
step 5, fine finishing: trimming the cutter point part of the cutter wheel into a convex arc shape, and designing a trimming numerical control program of a complete semicircular arc profile according to the radius of the convex arc on the cutter wheel; selecting smaller discharge parameters and grinding depth, and removing the abrasive layer in the finishing area in the step 2; returning to the step 3 to repair the cutter wheel if the profile loss of the cutter wheel exceeds 10 micrometers during finishing; and continuing fine finishing until the finally finished contour is well matched with the contour size to be finished, and finishing to obtain the concave circular arc grinding wheel.
2. The method for precisely dressing a concave circular arc metal bond diamond-shaped grinding wheel according to claim 1, wherein in the steps 3, 4 and 5, the profile of the grinding wheel to be dressed and the real-time profile dressed by the grinding wheel can be compared on a reflected screen to determine the dressing allowance.
3. The precise trimming method for the concave arc metal-bonded diamond-formed grinding wheel according to claim 1, wherein the metal-based diamond grinding wheel to be trimmed is connected with a discharge anode of an electric spark power supply through a graphite electrode, the cutter wheel is connected with a discharge cathode of the electric spark power supply through the graphite electrode, and a discharge medium adopts compressed air.
4. The method for precisely dressing a concave circular arc metal bond diamond-shaped grinding wheel according to claim 1, wherein the cutter wheel is provided with an additional rotating mechanism, so that the cutter wheel can rotate in a range of-90 ° to 90 °, and the angle is randomly changed according to the positional relationship between the cutter wheel and the grinding wheel to be dressed to dress the shaped grinding wheel.
5. The method for precisely dressing a concave circular arc metal bond diamond-shaped grinding wheel according to claim 3 or 4, wherein the tool wheel is worn during dressing, the tool wheel needs to be repaired in order to ensure high precision of the profile of the grinding wheel to be dressed, the shape of the tool wheel is dressed by adjusting the position by using an additional rotating mechanism of the tool wheel according to the dressing amount to be removed and whether interference occurs between the tool wheel and the profile of the grinding wheel, and efficient dressing of the shape of the tool wheel is realized.
6. The method for precisely dressing a concave circular arc metal bond diamond grinding wheel according to claim 1, wherein the dressing of the concave circular arc grinding wheel and the repair of the cutter wheel are both automatically dressed by programming a numerical control program.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117283459A (en) * | 2023-09-15 | 2023-12-26 | 广东豪特曼机床股份有限公司 | Shaping grinding wheel dressing equipment for piston ring grinding processing and dressing method thereof |
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