CN112247681B - Method and device for trimming arc-shaped surface of ceramic CBN grinding wheel for grinding ball track - Google Patents

Method and device for trimming arc-shaped surface of ceramic CBN grinding wheel for grinding ball track Download PDF

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Publication number
CN112247681B
CN112247681B CN202011143454.6A CN202011143454A CN112247681B CN 112247681 B CN112247681 B CN 112247681B CN 202011143454 A CN202011143454 A CN 202011143454A CN 112247681 B CN112247681 B CN 112247681B
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grinding wheel
axis
repaired
ceramic cbn
tool
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CN112247681A (en
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高会强
穆龙阁
王志起
杨威
李世华
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Zhengzhou Research Institute for Abrasives and Grinding Co Ltd
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Zhengzhou Research Institute for Abrasives and Grinding Co Ltd
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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
    • B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
    • 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
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/04—Headstocks; Working-spindles; Features relating thereto
    • 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
    • B24B51/00—Arrangements for automatic control of a series of individual steps in grinding a workpiece
    • 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
    • B24B53/062—Devices or means for dressing or conditioning abrasive surfaces of profiled abrasive wheels using rotary dressing tools
    • 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
    • B24B53/12—Dressing tools; Holders therefor
    • B24B53/14—Dressing tools equipped with rotary rollers or cutters; Holders therefor

Abstract

The invention provides a method and a device for trimming an arc surface of a ceramic CBN grinding wheel for grinding a ball track, wherein a main shaft of the grinding wheel to be trimmed and a main shaft of a tool grinding wheel can act according to corresponding action parameters under the control of a central processing unit, wherein the main shaft of the grinding wheel to be trimmed is driven by an X-axis workbench capable of performing uniform reciprocating motion along an X axis, a Y-axis workbench arranged on the X-axis workbench and capable of performing uniform reciprocating motion along a Y axis, and an A-axis rotary table arranged on the Y-axis workbench and capable of freely rotating along an A axis, and the main shaft of the grinding wheel to be trimmed is arranged on the A-axis rotary table; the tool grinding wheel spindle is driven by a V-axis workbench which can do uniform reciprocating motion along the V-axis direction parallel to the X axis; the invention controls X, Y, A three-axis linkage through the central processing unit, so that the central point F of the repaired ceramic CBN grinding wheel can be positioned at a real-time coordinate position, the arc profiles with different sizes can be repaired, and the equipment universality is strong.

Description

Method and device for trimming arc-shaped surface of ceramic CBN grinding wheel for grinding ball track
Technical Field
The invention relates to the field of grinding wheel dressing for grinding, in particular to a method and a device for dressing an arc-shaped surface of a ceramic CBN grinding wheel for grinding a ball track.
Background
Mechanical parts such as a bearing, a CVT (continuously variable transmission), an RV (rotary vector) reducer and the like all roll in corresponding ball paths by using balls to realize corresponding mechanical actions, and the motion precision of the corresponding parts is directly determined by the precision of the ball paths; grinding of the ball tracks is required to ensure the machining accuracy of the ball tracks, and grinding wheels for grinding the ball tracks are generally called ball track grinding wheels.
The existing ball grinding wheel mainly comprises two types, namely a common abrasive grinding wheel and a superhard abrasive grinding wheel; the ceramic CBN ball track grinding wheel represented by CBN super-hard grinding materials has the advantages of long service life, good shape retentivity and high grinding efficiency, and effectively solves the problems of low grinding efficiency and poor precision stability of the common grinding material grinding wheel, but the existing ceramic CBN ball track grinding wheel also has the following defects:
firstly, due to the characteristics of high hardness and good wear resistance of the ceramic CBN ball track grinding wheel, in the production and manufacturing process, when a grinding material layer is dressed and processed, the dressing tool is seriously worn, so that the ceramic CBN ball track grinding wheel has low dressing efficiency, poor dressing precision and the like, and great difficulty is brought to the production and processing of the ceramic CBN ball track grinding wheel;
secondly, because the specifications of parts such as a bearing, a CVT (continuously variable transmission), an RV (rotary vector) reducer and the like are multiple, and parts with different specifications need to be finished by using ball track grinding wheels with different sizes and shapes, the sizes and the shapes of ceramic CBN ball track grinding wheel products are different; aiming at the grinding wheel products with different sizes and shapes, frequent adjusting equipment is needed in the production process, and a special finishing tool is configured for processing, so that the production cost is high, the processing efficiency is low, and the process universality is poor.
Disclosure of Invention
The invention aims to provide a method and a device for trimming an arc-shaped surface of a ceramic CBN grinding wheel for grinding a ball way, which can perform efficient and precise trimming and processing on the arc-shaped surfaces of the ceramic CBN grinding wheel to be trimmed with different outer diameters and different arc-shaped surface sizes, and solve the problems of low trimming and processing efficiency, high production cost and poor process universality of the arc-shaped surface of the ceramic CBN grinding wheel.
In order to achieve the purpose, the invention adopts the following technical scheme:
a ceramic CBN grinding wheel arc surface finishing method for ball track grinding comprises the following steps:
step 1: installing a tool grinding wheel on a tool grinding wheel spindle through a standard tool handle, and installing a repaired ceramic CBN grinding wheel on the repaired grinding wheel spindle through the standard tool handle, so that an outer contour arc line of an arc-shaped surface of the repaired ceramic CBN grinding wheel is tangent to the tool grinding wheel;
step 2: setting action parameters of a repaired grinding wheel spindle and a tool grinding wheel spindle in a central processing unit, and enabling the repaired grinding wheel spindle and the tool grinding wheel spindle to act according to the corresponding action parameters under the control of the central processing unit;
the main shaft of the grinding wheel to be repaired is driven by an X-axis workbench capable of performing uniform reciprocating motion along an X axis, a Y-axis workbench arranged on the X-axis workbench and capable of performing uniform reciprocating motion on a Y axis, and an A-axis revolving platform arranged on the Y-axis workbench and capable of freely rotating along an A axis, and the main shaft of the grinding wheel to be repaired is arranged on the A-axis revolving platform;
defining the coordinate of the central point F of the repaired ceramic CBN grinding wheel as the origin of coordinates (0,0,0) when the repaired ceramic CBN grinding wheel is in the vertical direction and is coplanar with the tool grinding wheel;
defining the current coordinate of the central point F of the repaired ceramic CBN grinding wheel as (X, Y, A) in the motion process of the main shaft of the repaired grinding wheel;
defining the radius of the repaired ceramic CBN grinding wheel as R0；
Defining the radius of the circular arc profile of a grinding wheel layer of the repaired ceramic CBN grinding wheel as R;
defining the single-movement chord length of the repaired ceramic CBN grinding wheel as delta L, namely defining the processing step length of the repaired ceramic CBN grinding wheel as delta L;
defining the position of the repaired ceramic CBN grinding wheel as an initial correction position when the X-axis workbench is positioned at the left end, adding one correction time to the repaired ceramic CBN grinding wheel every time the X-axis workbench moves rightwards, wherein the current dressing time of the repaired ceramic CBN grinding wheel is n;
the motion parameters of the main shaft of the dressed grinding wheel, namely the current coordinates (X, Y, A) of the center point F of the dressed ceramic CBN grinding wheel at the time of the nth dressing are as follows:
Figure BDA0002737975350000021
Y＝(R0-R)·cos(n·ΔL/R)；
Figure BDA0002737975350000022
wherein 0< A indicates that the current position of the center point F of the dressed ceramic CBN grinding wheel is located on the left side of the coordinate origin (0,0,0), A <0 indicates that the current position of the center point F of the dressed ceramic CBN grinding wheel is located on the right side of the coordinate origin (0,0,0), 0< n.DELTA.L < R/2 indicates that the current position of the center point F of the dressed ceramic CBN grinding wheel is located on the left side of the coordinate origin (0,0,0), -R/2< n.DELTA.L <0 indicates that the current position of the center point F of the dressed ceramic CBN grinding wheel is located on the right side of the coordinate origin (0,0, 0);
the motion speed of the central point F of the repaired ceramic CBN grinding wheel and the rotating speed of the main shaft of the repaired grinding wheel are calibrated by historical empirical values;
the tool grinding wheel spindle is driven by a V-axis workbench which can do uniform reciprocating motion along the V-axis direction parallel to the X axis;
the action parameters of the tool grinding wheel spindle comprise reciprocating distance, movement speed and rotating speed on an X axis, and are calibrated by the thickness of the tool grinding wheel and historical empirical values;
and step 3: and starting the machine tool to enable the ceramic CBN grinding wheel to be trimmed to act under the control of the central processing unit, and trimming by the tool grinding wheel until the trimming process is finished, namely the trimming time n is equal to the ratio of the length of the arc-shaped surface of the ceramic CBN grinding wheel to be trimmed to the processing step length delta L.
A ceramic CBN grinding wheel arc-shaped surface trimming device for grinding a ball path comprises a base, a workbench arranged on the base, an X-axis workbench arranged on the workbench and capable of performing uniform reciprocating motion along an X axis, a Y-axis workbench arranged on the X-axis workbench and capable of performing uniform reciprocating motion along a Y axis, an A-axis rotary table arranged on the Y-axis workbench and capable of freely rotating along an A axis, an adjusting cushion plate arranged on the A-axis rotary table, a repaired grinding wheel spindle arranged on the adjusting cushion plate, a repaired ceramic CBN grinding wheel arranged on the repaired grinding wheel spindle, a cross beam arranged on the base, an adjusting plate arranged on the cross beam, a V-axis workbench arranged on the adjusting plate and capable of performing uniform reciprocating motion along a V axis, a tool grinding wheel spindle arranged on the V-axis workbench, a tool grinding wheel arranged on the tool grinding wheel spindle and a central processing unit;
the X-axis workbench, the Y-axis workbench and the A-axis rotary table are used for driving the main shaft of the grinding wheel to be repaired to act under the control of the central processing unit; the V-axis workbench is used for driving the tool grinding wheel spindle to act under the control of the central processing unit.
The tool grinding wheel spindle and the repaired grinding wheel spindle are the same in height, and the axis of the tool grinding wheel spindle is perpendicular to the axis A.
The tool grinding wheel spindle and the repaired grinding wheel spindle are of standard taper hole structures for installing standard tool handles, and the tool grinding wheel and the repaired ceramic CBN grinding wheel are respectively arranged on the tool grinding wheel spindle and the repaired grinding wheel spindle through the standard tool handles.
The invention has the beneficial effects that:
the invention has the beneficial effects that:
1. according to the ceramic CBN grinding wheel arc-shaped surface trimming device for grinding the ball way, a machine tool is of a multi-shaft structure, X, Y, A three-shaft linkage is controlled by a central processing unit, trimming and processing of arc-shaped surfaces with different sizes can be achieved, and the device is strong in universality;
2. according to the ceramic CBN grinding wheel arc-shaped surface finishing device for grinding the ball track, the machine tool can enable the whole surface of the tool grinding wheel to participate in finishing through the reciprocating motion of the V shaft, so that the processing loss of the tool grinding wheel is greatly reduced, and the finishing and processing precision of the ceramic CBN grinding wheel to be finished is improved;
3. according to the ceramic CBN grinding wheel arc surface finishing method for the ball track grinding, the finished ceramic CBN grinding wheel arc surface processing line is converted into a straight line through the generating action, and the tool grinding wheel does single-axial motion along the generating straight line, so that the finishing efficiency and the processing precision can be obviously improved;
4. according to the ceramic CBN grinding wheel arc-shaped surface finishing method for the ball track grinding, disclosed by the invention, by the interpolation development machining method, the finishing machining of arc-shaped surfaces with different sizes and shapes can be finished by using a finishing device, so that the finishing machining cost is greatly reduced, and the production of customized and small-batch products is facilitated;
5. according to the method for trimming the arc-shaped surface of the ceramic CBN grinding wheel for grinding the ball track, X, Y, A three-axis linkage interpolation motion tracks, namely the motion tracks of the central point of the ceramic CBN grinding wheel to be trimmed, can be quickly obtained, and the compilation of interpolation programs can be efficiently completed;
6. the ceramic CBN grinding wheel arc-shaped surface finishing method for the ball track grinding can also change the interpolation precision of the interpolation motion trail by adjusting the parameter value of the relevant processing step length delta L of the motion trail, thereby effectively controlling the precision of the profile of the grinding wheel to be finished.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of the principles of the present invention;
FIG. 3 is a schematic diagram of the motion trajectories of a tool grinding wheel and a dressed ceramic CBN grinding wheel in accordance with the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 2 and 3: the invention relates to a method for trimming an arc-shaped surface of a ceramic CBN grinding wheel for grinding a ball track, which comprises the following steps:
step 1: installing a tool grinding wheel 12 on a tool grinding wheel spindle 11 through a standard tool handle, and installing a repaired ceramic CBN grinding wheel 13 on a repaired grinding wheel spindle 7 through the standard tool handle, so that an outer contour arc line of an arc surface of the repaired ceramic CBN grinding wheel 13 is tangent to the tool grinding wheel 12, and the tool grinding wheel 12 can effectively grind and repair the arc surface of the repaired ceramic CBN grinding wheel 13 as required;
step 2: the method comprises the following steps that the action parameters of a repaired grinding wheel spindle 7 and a tool grinding wheel spindle 11 are arranged in a central processing unit, the repaired grinding wheel spindle 7 and the tool grinding wheel spindle 11 act according to the corresponding action parameters under the control of the central processing unit, and concretely, the following method is adopted;
as shown in fig. 2 and 3: the main shaft 7 of the grinding wheel to be dressed is driven by an X-axis workbench 3 capable of performing uniform reciprocating motion along an X axis, a Y-axis workbench 4 arranged on the X-axis workbench 3 and capable of performing uniform reciprocating motion along a Y axis, and an A-axis rotary table 5 arranged on the Y-axis workbench 4 and capable of freely rotating along an A axis, and the main shaft 7 of the grinding wheel to be dressed is arranged on the A-axis rotary table 5; because the repaired ceramic CBN grinding wheel 13 is a circular grinding wheel, and the outer circle end surface, namely an arc surface, of the repaired ceramic CBN grinding wheel 13 is repaired, the arc surface cannot be ground by a conventional three-dimensional moving sliding table (X, Y, Z), but the arrangement of the A-axis revolving table 5 can enable the repaired ceramic CBN grinding wheel 13 to freely rotate along the A axis so as to ensure that the arc surface of the repaired ceramic CBN grinding wheel 13 can be repaired as required; further, because the repaired surface is an arc-shaped surface, the motion trail of the center point of the repaired ceramic CBN grinding wheel 13 is also arc-shaped, and therefore the action parameters of the repaired ceramic CBN grinding wheel 13 include the coordinate position of the center point of the repaired ceramic CBN grinding wheel 13, the motion speed of the center point F of the repaired ceramic CBN grinding wheel 13 and the rotation speed of the repaired grinding wheel spindle 7;
further, since the dressing of the dressed ceramic CBN grinding wheel 13 is dressed several times by step size during dressing, in order to obtain the position coordinates of the center point of the dressed ceramic CBN grinding wheel 13 at the time of the nth dressing, the following parameters are defined:
defining the coordinate of the central point F of the repaired ceramic CBN grinding wheel 13 as the coordinate origin (0,0,0) when the repaired ceramic CBN grinding wheel 13 is positioned in the vertical direction and is coplanar with the tool grinding wheel 12;
defining the current coordinate of the central point F of the ceramic CBN grinding wheel 13 to be dressed as (X, Y, A) in the motion process of the grinding wheel spindle 7 to be dressed;
defining the radius of the dressed ceramic CBN grinding wheel 13 as R0；
Defining the radius of the circular arc profile of the grinding wheel layer of the repaired ceramic CBN grinding wheel 13 as R;
defining the single-movement chord length of the repaired ceramic CBN grinding wheel 13 as delta L, namely defining the processing step length of the repaired ceramic CBN grinding wheel 13 as delta L;
defining the position of the repaired ceramic CBN grinding wheel 13 as an initial correction position when the X-axis workbench 3 is positioned at the left end, adding one to the number of times of dressing the repaired ceramic CBN grinding wheel 13 every time the X-axis workbench 3 moves to the right, wherein the number of times of dressing the current repaired ceramic CBN grinding wheel 13 is n;
the motion parameters of the dressed wheel spindle 7, i.e. the current coordinates (X, Y, a) of the center point F of the dressed ceramic CBN wheel 13 at the time of the nth dressing, are:
Figure BDA0002737975350000061
Y＝(R0-R)·cos(n·ΔL/R)；
Figure BDA0002737975350000062
wherein 0< a indicates that the current position of the center point F of the dressed ceramic CBN grinding wheel 13 is located on the left side of the origin of coordinates (0,0,0), a <0 indicates that the current position of the center point F of the dressed ceramic CBN grinding wheel 13 is located on the right side of the origin of coordinates (0,0,0), 0< n · Δ L < R/2 indicates that the current position of the center point F of the dressed ceramic CBN grinding wheel 13 is located on the left side of the origin of coordinates (0,0,0), and R/2< n · Δ L <0 indicates that the current position of the center point F of the dressed ceramic CBN grinding wheel 13 is located on the right side of the origin of coordinates (0,0, 0);
the movement speed of the central point F of the repaired ceramic CBN grinding wheel 13 and the rotating speed of the repaired grinding wheel spindle 7 are calibrated by historical empirical values;
the tool grinding wheel spindle 11 is driven by a V-axis workbench 9 which can do uniform reciprocating motion along the V-axis direction parallel to the X axis;
the action parameters of the tool grinding wheel spindle 11 comprise reciprocating distance, movement speed and rotating speed on an X axis, and are calibrated by the thickness of the tool grinding wheel 12 and historical empirical values; the reciprocating motion and the autorotation of the tool grinding wheel spindle 11 can ensure the abrasion uniformity of the tool grinding wheel 12, thereby ensuring the dressing precision of the repaired ceramic CBN grinding wheel 13;
and step 3: starting the machine tool, enabling the repaired ceramic CBN grinding wheel 13 to act under the control of the central processing unit, and repairing by the tool grinding wheel 12 until the finishing process is finished, namely the number of times n of repairing is equal to the ratio of the length of the arc-shaped surface of the repaired ceramic CBN grinding wheel 13 to the processing step length delta L; under the unified control of the central processing unit, the X-axis workbench 3, the Y-axis workbench 4, the A-axis rotary table 5 and the V-axis workbench 9 have three-axis linkage of X-axis translation, Y-axis translation and A-axis rotation and matched V-axis reciprocating motion, so that the specific 3.5-axis linkage control of the machine tool is realized, even if the repaired ceramic CBN grinding wheel 13 acts under the control of the central processing unit.
As shown in fig. 1: the invention also provides a ceramic CBN grinding wheel cambered surface dressing device for ball track grinding, which comprises a base 1, a workbench 2 arranged on the base 1, an X-axis workbench 3 arranged on the workbench 2 and capable of performing uniform reciprocating motion along an X axis, a Y-axis workbench 4 arranged on the X-axis workbench 3 and capable of performing uniform reciprocating motion along a Y axis, an A-axis rotary table 5 arranged on the Y-axis workbench 4 and capable of freely rotating along the A axis, an adjusting cushion plate 6 arranged on the A-axis rotary table 5, a main shaft 7 of a grinding wheel to be dressed arranged on the adjusting cushion plate 6, a ceramic CBN grinding wheel 13 to be dressed arranged on the main shaft 7 of the grinding wheel to be dressed, a cross beam 8 arranged on the base 1, an adjusting plate 10 arranged on the cross beam 8, a V-axis workbench 9 arranged on the adjusting plate 10 and capable of performing uniform reciprocating motion along a V axis, a main shaft 11 of a tool grinding wheel arranged on the V-axis workbench 9, a grinding wheel, A tool grinding wheel 12 and a central processor which are arranged on the tool grinding wheel spindle 11; the base 1 and the workbench 2 are arranged to facilitate the movement of the correcting device, and preferably, universal wheels are arranged below the base 1; the arrangement of the adjusting base plate 6 and the adjusting plate 10 is convenient for manually adjusting the directions of the grinding wheel spindle 7 to be dressed and the tool grinding wheel spindle 11 before dressing; the X-axis workbench 3, the Y-axis workbench 4 and the A-axis rotary table 5 are used for driving the grinding wheel spindle 7 to be repaired to act under the control of the central processing unit; the V-axis workbench 9 is used for driving a tool grinding wheel spindle 11 to act under the control of the central processing unit; furthermore, the central processing unit can adopt logic programmable devices such as PLC with low price and high response speed as required, and also can adopt an industrial computer with reliable performance and complete functions; furthermore, the tool grinding wheel spindle 11 and the repaired grinding wheel spindle 7 are controlled by frequency conversion, so that the rotation speed and the steering can be adjusted and controlled.
Preferably, the height of the tool grinding wheel spindle 11 is the same as that of the dressed grinding wheel spindle 7, and the axis of the tool grinding wheel spindle 11 is perpendicular to the axis A, so as to ensure the dressing effect of the dressed ceramic CBN grinding wheel 13.
Preferably, the shaft ends of the tool grinding wheel spindle 11 and the dressed grinding wheel spindle 7 are in a standard taper hole structure for installing a standard tool shank, and the tool grinding wheel 12 and the dressed ceramic CBN grinding wheel 13 are respectively arranged on the tool grinding wheel spindle 11 and the dressed grinding wheel spindle 7 through the standard tool shank, so that the universality of the dressing device is improved.
In order to facilitate further understanding of the technical solutions of the present invention, the technical solutions of the present invention will be further described with specific examples below:
in this embodiment, in order to trim the trimmed ceramic CBN grinding wheel 13 for forming a lane, which has a diameter of 60mm and a thickness of 7mm, into a trimmed ceramic CBN grinding wheel 13 having a circular arc surface radius R of 3.25mm, the used tool grinding wheel 12 is a flat diamond grinding wheel having a diameter of 150mm and a thickness of 10 mm;
before dressing, firstly, a tool grinding wheel 12 is installed on a tool grinding wheel spindle 11 through a standard tool handle, a ceramic CBN grinding wheel 13 to be dressed is installed on a grinding wheel spindle 7 through the standard tool handle, and the center of the ceramic CBN grinding wheel 13 to be dressed is collinear with the axis of an A-axis revolving platform 5 through an adjusting backing plate 6; moving the X-axis workbench 3, the Y-axis workbench 4 and the a-axis turntable 5 to make the center of the arc surface of the repaired ceramic CBN grinding wheel 13 tangent to the tool grinding wheel 12, aligning the centers, setting a coordinate origin (0,0,0) and a machining step length Δ L in the central processing unit, wherein Δ L is 0.1mm, setting a control program in the central processing unit according to the current coordinates (X, Y, a) of the center point F of the repaired ceramic CBN grinding wheel 13 in step 2, wherein it should be noted that the current coordinates (X, Y, a) of the center point F are only related to the current number of times of correction n and the machining step length Δ L; further, setting the movement speed of the central point F of the repaired ceramic CBN grinding wheel 13 to be 3mm/min and the rotation speed of the repaired grinding wheel spindle 7 to be 100rpm according to historical experience values; further, according to historical experience values, the reciprocating distance on the X axis of the tool grinding wheel 12 is set to be 25mm, the movement speed is set to be 400mm/min, and the rotating speed is set to be 2500 rpm; after the action parameters are led into the central processing unit, the machine tool is started, and the trimming processing of the excircle profile R3.25 arc-shaped surface of the repaired ceramic CBN grinding wheel 13 for forming the fairway can be automatically completed within 10 min; the trimmed arc-shaped surface is inspected, the R3.25 size deviation is less than 0.01, the product processing efficiency is far higher than that of other process methods, and the requirements on the processing efficiency and the precision of the product can be completely met.
The invention has the beneficial effects that:
1. according to the ceramic CBN grinding wheel arc-shaped surface trimming device for grinding the ball way, a machine tool is of a multi-shaft structure, X, Y, A three-shaft linkage is controlled by a central processing unit, trimming and processing of arc-shaped surfaces with different sizes can be achieved, and the device is strong in universality;
2. according to the ceramic CBN grinding wheel arc-shaped surface dressing device for grinding the ball track, the machine tool can enable the whole surface of the tool grinding wheel 12 to participate in dressing and processing through the reciprocating motion of the V shaft, so that the processing loss of the tool grinding wheel 12 is greatly reduced, and the dressing and processing precision of the ceramic CBN grinding wheel 13 to be dressed is improved;
3. according to the ceramic CBN grinding wheel arc surface finishing method for the ball track grinding, the finished ceramic CBN grinding wheel 13 arc surface processing line is converted into a straight line through the generating action, the tool grinding wheel 12 makes a single axial movement along the generating straight line, and the finishing efficiency and the processing precision can be obviously improved;
4. according to the ceramic CBN grinding wheel arc-shaped surface finishing method for the ball track grinding, disclosed by the invention, by the interpolation development machining method, the finishing machining of arc-shaped surfaces with different sizes and shapes can be finished by using a finishing device, so that the finishing machining cost is greatly reduced, and the production of customized and small-batch products is facilitated;
5. according to the method for trimming the arc-shaped surface of the ceramic CBN grinding wheel for grinding the ball track, X, Y, A three-axis linkage interpolation motion tracks, namely the motion track of the central point of the ceramic CBN grinding wheel 13 to be trimmed, can be quickly obtained, and the compilation of interpolation programs can be efficiently completed;
6. the ceramic CBN grinding wheel arc-shaped surface finishing method for the ball track grinding can also change the interpolation precision of the interpolation motion trail by adjusting the parameter value of the relevant processing step length delta L of the motion trail, thereby effectively controlling the precision of the profile of the grinding wheel to be finished.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (1)

1. A ceramic CBN grinding wheel arc surface finishing method for ball track grinding is characterized by comprising the following steps:
step 1: installing a tool grinding wheel on a tool grinding wheel spindle through a standard tool handle, and installing a repaired ceramic CBN grinding wheel on the repaired grinding wheel spindle through the standard tool handle, so that an outer contour arc line of an arc-shaped surface of the repaired ceramic CBN grinding wheel is tangent to the tool grinding wheel;
step 2: setting action parameters of a repaired grinding wheel spindle and a tool grinding wheel spindle in a central processing unit, and enabling the repaired grinding wheel spindle and the tool grinding wheel spindle to act according to the corresponding action parameters under the control of the central processing unit;
the main shaft of the grinding wheel to be repaired is driven by an X-axis workbench capable of performing uniform reciprocating motion along an X axis, a Y-axis workbench arranged on the X-axis workbench and capable of performing uniform reciprocating motion on a Y axis, and an A-axis revolving platform arranged on the Y-axis workbench and capable of freely rotating along an A axis, and the main shaft of the grinding wheel to be repaired is arranged on the A-axis revolving platform;
defining the coordinate of the central point F of the repaired ceramic CBN grinding wheel as the origin of coordinates (0,0,0) when the repaired ceramic CBN grinding wheel is in the vertical direction and is coplanar with the tool grinding wheel;
defining the current coordinate of the central point F of the repaired ceramic CBN grinding wheel as (X, Y, A) in the motion process of the main shaft of the repaired grinding wheel;
defining the radius of the repaired ceramic CBN grinding wheel as R0；
Defining the radius of the circular arc profile of a grinding wheel layer of the repaired ceramic CBN grinding wheel as R;
defining the single-movement chord length of the repaired ceramic CBN grinding wheel as delta L, namely defining the processing step length of the repaired ceramic CBN grinding wheel as delta L;
defining the position of the repaired ceramic CBN grinding wheel as an initial correction position when the X-axis workbench is positioned at the left end, adding one to the dressing frequency of the repaired ceramic CBN grinding wheel every time the X-axis workbench moves rightwards, wherein the dressing frequency of the current repaired ceramic CBN grinding wheel is n;
the motion parameters of the main shaft of the dressed grinding wheel, namely the current coordinates (X, Y, A) of the center point F of the dressed ceramic CBN grinding wheel at the time of the nth dressing are as follows:
Figure FDA0003224019860000011
Y＝(R0-R)·cos(n·△L/R)；
Figure FDA0003224019860000021
wherein 0< A indicates that the current position of the center point F of the dressed ceramic CBN grinding wheel is located on the left side of the coordinate origin (0,0,0), A <0 indicates that the current position of the center point F of the dressed ceramic CBN grinding wheel is located on the right side of the coordinate origin (0,0,0), 0< n · Δ L < R/2 indicates that the current position of the center point F of the dressed ceramic CBN grinding wheel is located on the left side of the coordinate origin (0,0,0), -R/2< n · Δ L <0 indicates that the current position of the center point F of the dressed ceramic CBN grinding wheel is located on the right side of the coordinate origin (0,0, 0);
the motion speed of the central point F of the repaired ceramic CBN grinding wheel and the rotating speed of the main shaft of the repaired grinding wheel are calibrated by historical empirical values;
the tool grinding wheel spindle is driven by a V-axis workbench which can do uniform reciprocating motion along the V-axis direction parallel to the X axis;
the action parameters of the tool grinding wheel spindle comprise reciprocating distance, movement speed and rotating speed on a V axis, and are calibrated by the thickness of the tool grinding wheel and historical empirical values;
and step 3: and starting the machine tool to enable the ceramic CBN grinding wheel to be trimmed to act under the control of the central processing unit, and trimming by the tool grinding wheel until the trimming process is finished, namely the trimming time n is equal to the ratio of the length of the arc-shaped surface of the ceramic CBN grinding wheel to be trimmed to the processing step length delta L.
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