JP2002331446A - Grinding device of cylindrical work having repetitive profile and shift plunge grinding method of cylindrical work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize an NC cylindrical grinding device of a cylindrical work having a repetitive pattern (a profile) such as a crushing blade roller of a shredder, and to shorten a grinding cycle and grinding wheel dressing time. SOLUTION: This grinding device 1 of the cylindrical work has a gripping mechanism composed of a spindle stock 13 and a tailstock 14 capable of rotating a work with the Z axis as the center by gripping the side end of the work, a reciprocatable table 11, a formed rotary dresser 60 fixed to the back of the spindle stock arranged on the table, and having n pieces of repetitive profiles arranged on the table, and the repetitive profile having a moving mechanism for relatively moving a formed grinding wheel 16 having r pieces of repetitive profiles in the rotational axis direction Z of the work gripped by the gripping mechanism, and a rotary mechanism of the formed grinding wheel. (Where, m is an integer not less than 6, n is an integer not less than 3, and is smaller than m, a value by dividing m by n is a number of 2 to 10, r is an integer not less than 3, and is the same interger as n, and is smaller than n, and a value by dividing n by r is a number of 1 to 5).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a profile (pattern) repeatedly applied to the outer periphery of a cylindrical work such as a crushing blade for shredding paper or film, a trash crushing roll of a refuse collection vehicle, and the like. The present invention relates to an NC cylindrical grinding apparatus having a grinding wheel, a method of grinding a work using the same, and a method of dressing a grinding wheel.

[0002]

2. Description of the Related Art A cylindrical work side end is gripped by a work gripper, a grindstone is positioned at one end of the work, and a grindstone which rotates while rotating the work and the grindstone is used for the work piece. The workpiece is moved in a direction orthogonal to the rotation axis direction (Z axis direction), plunge grinding is performed, and then the work is moved to the other end of the work along the rotation axis direction of the work. Traverse grinding for performing the entire grinding is known (JP-A-6-27004).
4, JP-A-6-278020, JP-A-2001-3858
No. 6, Japanese Patent Application No. 2000-216750).

In traversing cycle grinding, both ends of a cylindrical work are gripped by grippers of a headstock and a tailstock using a cylindrical grinding device, and a motor built in the headstock is used. While rotating the cylindrical work, the rotating whetstone, which is supported by the grindstone shaft, is advanced in the front-rear direction (X-axis direction) to cut the work, and the table is moved in the left-right direction (Z-axis direction). Move to grind the outer periphery of the work.

[0004] Further, the end of the cylindrical work having a length of L is a wire.
A plunge grinding step of gripping with a work gripper and relatively moving a rotating grindstone while rotating the work in a rotation axis direction (Z-axis direction) of the work to grind an outer periphery of the work; There is also known a shift plunge grinding method for grinding the outer periphery of a work by repeating a shift step of retracting the work from a work and then moving the work relative to the grindstone (a cylindrical grinder of Okamoto Machine Tool Works, Ltd.). Pumplets: 1999, 1
It has been commercialized (issued and distributed in October) (Okamoto Machine Tool Works, Ltd. cylindrical grinder OGM-NC (trade name)). When the outer peripheral surface of the grindstone is worn, the grindstone is moved onto the diamond tool and dressed.

FIG. 10 is a flowchart of shift plunge grinding. Shift plunge grinding has the advantage that the cycle time required for grinding can be significantly reduced as compared with traverse grinding.

The work shown in FIG. 6 is a crushing blade of a shredder. The grinding sum - click is cylindrical word - having 36 in - (down pattern) of the groove w _b and blade mountain w _a - click regular on the outer peripheral surface of the prophy Le. 1
A long grinding time is required for grinding using a shaped wheel having multiple peaks. The grindstone is dressed by a dresser before, during or after the work grinding.
To dress using a tabletop dresser with two single-stone diamond dressers shown in
Since the right side and the left side are dressed, the dressing time becomes longer.

[0007] Japanese Patent Application Laid-Open No. 2001-88024 discloses a
A pair of grindstones attached to a grindstone base using a grindstone provided with profiles (patterns) of a male and female relationship for a machining work in which the same profile for the outer peripheral surface is repeated a plurality of times. The X-axis direction in which the grinding wheel is fixed to a grinding wheel shaft whose both ends are supported by a shaft housing and driven to rotate, and the grinding wheel table approaches or retreats to a work supported on a bed in parallel with the grinding wheel shaft There is disclosed a grinding apparatus for moving a workpiece relatively to a workpiece.

[0008] Such a grinding apparatus in which the pattern of the grinding wheel and the pattern of the processed work have the length corresponding to 1: 1 by reversing the sexes, requires a large wheel base. In addition, the driving force of the grinding wheel shaft also increases, and the size of the apparatus increases, and the cost increases.

[0009]

SUMMARY OF THE INVENTION One object of the present invention is to provide:
Machining work with multiple regular profiles on the outer surface
An object of the present invention is to provide an NC cylindrical grinding apparatus capable of grinding a workpiece in a shorter time and reducing the dressing time of a grindstone. . A second object of the present invention is to provide a grinding method capable of shortening a grinding time by shift plunging a work using the NC cylindrical grinding apparatus, and a third object of the present invention is to provide a method of dressing a grindstone. is there.

According to a first aspect of the present invention, a cylindrical work side end is gripped by a work gripper, and a forming whetstone rotating while rotating the work is rotated in the direction of the rotation axis (Z) of the work. Plunge grinding step of grinding the outer periphery of the work by relative movement in the axial direction), and a shift step of moving the work wheel away from the work and then moving the work relative to the work wheel are repeated. An NC grinding apparatus for grinding the outer periphery of a work to process a cylindrical work having m repetitive profiles on the outer periphery, wherein the NC grinding apparatus grips a side end of the work. A gripping mechanism comprising a headstock and a tailstock capable of rotating the work about the Z-axis;
A table reciprocally movable in a direction (Z-axis direction) parallel to the long axis of the motor, and n number of n-shaped fixed tables provided behind the headstock provided on the table. A relative rotary dresser having a repetitive profile and a general grindstone having r repetitive profiles are relatively moved in the rotation axis direction (Z-axis direction) of the workpiece gripped by the gripping mechanism. An object of the present invention is to provide an apparatus for grinding a cylindrical work having a repetitive profile having a moving mechanism for performing the above operation and a rotating mechanism for the above-mentioned forming wheel. (However, m is an integer of 6 or more,
n is an integer of 3 or more and smaller than m, and a value obtained by dividing m by n is a number of 2 or more and 10 or less, and r is an integer of 3 or more and n
Is the same integer as or smaller than n, and the value obtained by dividing n by r is a number from 1 to 5. ).

[0011] Since the cylindrical grinding device is capable of performing shift plunge grinding using a formed grinding wheel having a plurality of repetitive profiles, the grinding time can be reduced. Further, since a rotary dresser having a plurality of repetitive profiles is used, the dressing time can be shortened to each stage as compared with the conventional table-top two-point single stone dresser. Also,
This rotary dresser can be moved in the Z-axis direction together with a table on which a work gripping mechanism is installed behind the headstock of the cylindrical grinding device, so that the moving time to the vicinity of the grinding wheel is increased. Can be shortened.

According to a second aspect of the present invention, a cylindrical work side end is gripped by a gripping mechanism comprising a headstock and a tailstock using the NC grinding apparatus, and the work is rotated while rotating. A plunge grinding step of relatively moving the forming grindstone in the rotation axis direction (Z-axis direction) of the work to grind the outer periphery of the work;
A cylindrical work having m repetitive profiles on the outer periphery of the work is repeated by repeating the shifting step of retracting the work-form grindstone from the work and moving the work relative to the work-form grindstone. And a shift plunge grinding method, characterized by processing. (However, the number of times of incision and plunge grinding is the number of times that the value p obtained by dividing m by n is an integer, and the number of times that the value is a positive number having a decimal point is (p + 1) times. (The number of shifts q for moving the work with respect to the grindstone is one less than the number of plunge grinding operations.)

Since a cylindrical work is subjected to shift plunge grinding using a formed grinding wheel having a plurality of repetitive profiles, the grinding time of the work can be reduced. In addition, the size of the wheel head can be reduced.

According to a third aspect of the present invention, a table is moved to form a rotary rotary dresser in front of a general grinding wheel before, during or after grinding of a workpiece. The present invention provides a dressing method for a grindstone, which comprises moving and then bringing a rotating forming grindstone into contact with a rotating forming rotary dresser to perform dressing. (However, if the value t obtained by dividing n by r is a positive number exceeding 1, after the first table movement and after the dressing operation is completed, the general grinding wheel is retracted from the general rotary dresser. Then, the table is moved so that the forming rotary dresser is positioned on the forming wheel portion where the dressing operation has not been performed yet, and then the forming rotary wheel rotating the forming wheel is moved. The dresser is brought into contact with a dresser and dressing is performed, and a shift dressing operation of retreating the table, moving the table, and contacting and contacting the block rotary dresser of the block is performed as many times as there are no undressed portions. The number of shift dressing operations is represented by n = r
When the value z divided by is an integer, the number is (z-1) times, and when the value z is a positive number having a decimal point, the number is z times. )

A row having a plurality of repeating profiles
The shift plunge dressing of the formed grindstone using the tally dresser can shorten the dressing time of the formed grindstone.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the drawings. FIG. 1 is a plan view of an NC cylindrical grinding device, and FIG.
FIG. 3 is a right side view of the NC cylindrical grinding device, FIG. 4 is a partially enlarged plan view of the NC cylindrical grinding device shown in FIG. 1, FIG. 5 is a sectional view taken along line II in FIG. FIG. 7 is a front view of the target finished work, FIG. 7 is a plan view showing the positional relationship between the work and the forming grindstone in shift plunge grinding, and FIG. 8 is a forming rotary dresser in shift plunge dressing. Plan view showing the positional relationship between
FIG. 9 is a schematic view of the rotary gear during shift plunge dressing.
It is a top view which shows the state in which a dresser and a form wheel are in contact.

In the NC cylindrical grinding apparatus shown in FIGS. 1, 2 and 3, 1 is a cylindrical grinding apparatus, 10 is a bed, and a V-shaped guide rail provided on a slide table 11a on the bed 10. 11b, 11b (see FIG. 5)
The work table 11 is guided and supported by sliders 11b, 11b so as to be able to reciprocate in the horizontal direction (long-axis direction Z of the work w).

A headstock 13 and a tailstock 14 are installed on the worktable 11 so as to face each other. The headstock is provided with a chuck 13a for gripping one end of the work and a tailstock. A center 14 supports the other end of the work at the center.
a is provided. Both ends of the work are supported by the headstock 13 and the tailstock 14 so that the rotation axis of the work is parallel to the horizontal movement direction of the table 11, and the work is fixed to the frame 13b of the headstock 13. With the motor 13c provided,
Is driven to rotate.

On the back of the headstock 13, the bottom of the housing of the rotary dresser 60 is fixed to the table 11 by bolts 11d and 11d, and the frame 13b of the headstock is used to prevent roll. Also, the side wall of the housing of the rotary dresser 60 is fixed via a clamp 64. The rotary dresser moves in the Z-axis direction together with the table by moving in the Z-axis direction of the table 11 (see FIG. 5). The rotary dresser 60 is a forming tool having three repetitive patterns, and uses a diamond grindstone or a CBN grindstone. Rotary dresser 60
Transmits the rotational driving force of the motor 61 to the dresser shaft by means of a pulley or belt (not shown) to rotate the rotary dresser. This general form rotary dresser 60
Is protected on the side and back by a grindstone cover 62. The motor is housed in a housing 65.

Returning to FIG. 1, FIG. 2 and FIG.
0, the wheel head 15 moves in the direction of movement of the table 11 (Z
The guide is supported in the X-axis direction perpendicular to the
In FIG. 5, the grindstone 16 has an axis D parallel to the moving direction of the table 11.
It is rotatably supported around it. The form wheel 16 has eight identical patterns (see 7). 16a is a grindstone shaft, 17 is an AC servomotor, 17a is a pulley, and A
The driving force of the C servo motor is transmitted to the grinding wheel shaft 16a. The forming wheel head 6 is provided with a grinding wheel layer on the outer periphery of a disk-shaped grinding wheel core, and a diamond layer or a CBN abrasive grain vitrified bond is used as the grinding wheel layer. A cover 72 is provided in front of the general shape grindstone 16 and the general shape rotary dresser 60 so that an operator is safe. A water injection device 70 containing a grinding fluid is installed in the rear area of the bed, and the grinding fluid is sprayed from a nozzle 18 onto the surface of the work to be ground.

The wheel head 15 is driven by an AC servomotor 21 on a rail 10d provided on the bed 10,
For example, it is guided by a VV sliding surface, and is used for ball screws, ac
Approach or cut into the long axis of the work w or the dresser axis of the general dresser by a motor, or retreat away from these axes (perpendicular to the long axis Z of the work w). Approach or retreat in the X-axis direction). Instead of the ball screw type movement, a linear guide type, belt or cam type feed type may be used.

A size measuring sensor 24 for measuring the diameter of the work on the table 11 and outputting the measurement signal.
Is attached. The measurement signal output from the size measurement sensor 24 is input to the amplifier 20, and the signal amplified by the amplifier is output to the numerical control 40 via the A / D converter 25. This sizing measurement sensor is a grinding end point detecting device for measuring a grinding allowance of a work in shift plunge grinding.

As the fixed size measuring sensor 24, for example, a two-probe displacement sensor Microma 3 (trade name) manufactured by Marbos Co., Ltd. can be used. Cylindrical Wa - click w using a two-probe displacement sensor "Maikuroma 3" (trade name) as a grinding endpoint detection apparatus when grinding terminated when is desired thickness r ₀ grinding radially grinding start The terminals of the two-probe displacement sensor are applied to the top and bottom of the previous work, and a LO signal is issued to the control device to store the radius (distance R) of the work. ), While the position of the terminal is fixed, the other (upper) terminal is made to follow the height of the outer peripheral surface of the work being ground, and the ground height (the distance r _i at which the upper terminal has fallen) is numerically determined. Inform the control unit that the grinding height r _i
When reaches a desired value of the grinding thickness r ₀ , an HI signal is issued from the numerical controller 40 to the AC servomotor 22 of the cylindrical grinding device 1 to retreat the formed grindstone from the work, and To finish grinding.

Also, a non-contact laser made by Keyence Corporation
The-displacement sensor LK-2100 (trade name) is also used. A laser displacement sensor provided at a position perpendicular to the axis of the work so that the laser beam shines upon the start of grinding of a 2R diameter work on the front and rear slide table. used Le - Wa is ground from the displacement sensor - measures the distance L _i up to the outer periphery of the click, the grinding start Wa - displacement of the distance L _i in the distance L ₀ and grinding to the outer periphery of the click Width (Δ =
When L ₀ -L _i ) becomes r ₀ , the grinding of the cylindrical work is completed (see Japanese Patent Application No. 2000-216750).

The numerical controller 40 has a central processing unit (CP)
U) 45, memory 44, interfaces 46 and 47
It is composed of The interface 46 includes a control panel 50 for inputting control parameters necessary for NC control and an NC program, and the A / D converter 2 of the fixed size sensor 24 described above.
5 is connected. Further, servo motor driving circuits (DU) 41 and 42 are connected to the interface 47. The servo motor drive circuits 41 and 42 receive commands from the central processing unit 45 and receive servo motors 21 and 22.
This is a circuit for driving. The memory 44 is provided with control parameters and an NC program area input from the operation panel 50.

A procedure for grinding a product having m repetitive patterns (profiles) from a cylindrical work using the NC cylindrical grinding apparatus 1 will be described below. First, a shift plunge grinding program, which is a work machining program, is selected from the keyboard of the operation panel 50, and then the work reference point Z ₀ , the grinding wheel axis reference point X ₀ , - Bull inverted position, the grinding allowance, plunge grinding times during shift plunge grinding, Te - Burushifuto number grindstone cut starting point position X _1, and enter the machining conditions such as the grinding wheel head retraction position X _2, then dressing condition input screen To select the dressing pattern program, and
₀ , dressing conditions such as dressing times and shift times are input.

Each reference point is, for example, a work reference point Z _0.
Is defined as the intersection of the long axis Z of the work and the vertical surface of the work head 16 passing through the whetstone center toward the work by placing the table 11 at the inverted position on the headstock 13 side. The point X ₀ is
Grinding head word - the intersection of the long axis recessed from Z (retracted) by the grinding wheel head standby position and the grindstone axis X of the click, the dress reference point D _0, Wa - parallel to the click long axis B - Tali - A straight line D passing through the center of the axis of rotation of the dressing grindstone and a vertical surface facing the work passing through the grindstone center of the grindstone head 16 with the long axis of the work with the table 11 at the inverted position on the headstock side. (See Figure 4)
reference).

In order to obtain m cylindrical work pieces having a repetitive pattern of m, the number of times the repetitive pattern is repeatedly cut by a total pattern of n pieces of grindstones to perform plunge grinding is m When the value p divided by n is an integer, it is the number of times of the value p, and when it is a positive number having a decimal point, it is (p + 1) times. Is the number of times one less than the number of times of plunge grinding.

The dressing of the forming wheel 16 having n repetitive patterns using a rotary dresser 60 having r repetitive patterns has a value t obtained by dividing n by r.
Is a positive number exceeding 1, the first table 1
After one move and then the dressing work is completed,
6 is retracted from the form rotary dresser 60, and then the table is moved so that the form rotary dresser is positioned on the form wheel where no dressing work has been performed yet. Form-b rotating a whetstone
The dressing is performed by contacting with a tally dresser.
The shift dressing operation of contacting and approaching the tally dresser is performed the number of times that the undressed portion is eliminated. The number of shift dressing operations is (z-1) when the value z obtained by dividing n by r is an integer, and z when the value z is a positive number having a decimal point.

[0030] For example, the mountain _{w a} milling cutter shown in Fig 21
Number (mountain of the end is not have to account because it is half), the valley w _b 2
In order to complete a grinding blade having zero grinding blades by shift plunge grinding, the form wheel has eight peaks, so the number of plunge grinding times p is three, the table movement is two, and the table movement is two.
The moving width of the bull is set to a length reduced by the width of one peak of the forming wheel, and the two peaks of the work are ground twice. Of course,
The peaks are ground so that the peak is ground to 8, 8, and 5 in order.
You may move the bull.

In a rotary dresser 60 having three repetitive patterns shown in FIG. 8, the number of dressers of the formed grindstone 16 having the eight repetitive patterns is three, and the number of table movements is three. Is twice.

As another example, the grinding width L of the work w is 15
To obtain a finished product with 6 mm, work diameter 60 mm, grinding depth 5.5 mm, forming pitch 6.4 mm, and 24 peaks, a total grinding wheel with a grinding wheel width of 80 mm and a repetitive pattern of 12 peaks, The number of times of plunge grinding is two, and the number of times of table movement is one. In order to dress the pattern with three rotary dressers in which the peak of the pattern is repeated with this three-dimensional grindstone, the number of dressing times is four.
And the number of table movements is three.

The grinding width L of the work w is 240 mm, the work diameter is 75 mm, the grinding depth is 6.5 mm, and the forming pitch is 8.4.
mm, to obtain a finished product with 28 peaks, whetstone width 120m
m, the total grinding wheel with 15 peaks in the repetitive pattern has two plunge grindings and one table movement. The dressing is repeated five times and the table is moved four times in order to repeatedly dress this form-shaped whetstone with a rotary dresser having three pattern peaks.

The grinding width L of the work w is 300 mm, the work diameter is 90 mm, the grinding depth is 6.5 mm, and the forming pitch is 10.
To obtain a finished product with 2mm and 27 peaks, grindstone width 100m
In the case of m, the total grinding wheel having 9 repetitive patterns has three plunge grinding times and two table movement times. In order to repeatedly dress this form wheel with a rotary dresser having three pattern peaks, the number of dresses is three and the number of table movements is two.

Using the above NC grinding apparatus, a cylindrical work w
The side end is gripped by a gripping mechanism consisting of a headstock 13 and a tailstock 14, and the forming grindstone 16 which rotates while rotating the work at 100 to 300 min- ¹ is moved in the rotation axis direction Z of the work. The outer periphery of the work is firstly plunge-ground by relative movement (dotted arrow in FIG. 7), and then the formed grindstone is retracted from the work (solid arrow in FIG. 7). −
The work is moved relative to the forming grindstone 16 by moving the table 11 (the horizontal solid arrow in FIG. 7), and then the forming grindstone 16 is relatively moved in the rotation axis direction Z of the work. After the outer periphery of the work is plunged for the second time, the formed grindstone is retracted from the work. Thereafter, the table shift step, the plunge grinding step, and the retreating step of the forming grindstone are repeated until an unground portion is eliminated, thereby processing a cylindrical work having m repetitive patterns on the outer periphery of the work. . Plunge grinding may be performed by dividing into rough grinding, medium grinding, and fine grinding.

Before starting the grinding of the work, during the grinding, or after the grinding, the table 11 is moved to move the rotary rotary dresser 60 in front of the grinding wheel (dotted line in FIG. 8). Arrow), and then the rotating forming grindstone is brought into contact with the rotating forming rotary dresser to perform dressing. Next, the formed grindstone 16 is retracted from the rotary dresser 60 (solid arrow in FIG. 8), and the table 11 is moved (horizontal solid arrow in FIG. 7). After the dresser is relatively moved with respect to the forming grindstone 16, and then the forming grindstone 16 is relatively moved in the rotation axis direction D of the rotary dresser to perform the second dressing of the outer periphery of the forming grindstone, B.
Retreat from tally dresser. Thereafter, the table shifting step, the dressing step, and the retreating step of the forming grindstone are repeated until the undressed portion disappears, thereby dressing the forming grindstone having n repetitive patterns.

[0037]

The NC cylindrical grinding apparatus of the present invention capable of shift plunge grinding of a cylindrical work with a forming wheel is the same as a conventional cylindrical grinding apparatus in which the work and the forming wheel have a 1: 1 length standard. Since the width of the grinding wheel is relatively small, the spindle shaft for rotating the grinding wheel head and the grinding wheel head is small, the electric capacity of the AC servomotor is also small, and the apparatus is compact. Also,
The dressing time of the dressing of the formed whetstone is also shortened because the shift plunge dressing is performed using the formed dress.

[Brief description of the drawings]

FIG. 1 is a plan view of an NC cylindrical grinding device.

FIG. 2 is a front view of an NC cylindrical grinding device.

FIG. 3 is a right side view of the NC cylindrical grinding device.

FIG. 4 is a partially enlarged plan view of the NC cylindrical grinding device shown in FIG.

FIG. 5 is a sectional view taken along a line II in FIG. 1;

FIG. 6 is a front view of a target finished work product.

FIG. 7 is a plan view showing a positional relationship between a work and a form wheel in shift plunge grinding.

FIG. 8 is a plan view showing a positional relationship between a general rotary dresser and a general grinding wheel in shift plunge dressing.

FIG. 9 is a plan view showing a state in which a general rotary dresser and a general grinding wheel are in contact with each other during shift plunge dressing.

FIG. 10 is a flowchart showing movement of a grindstone and a work when performing shift plunge grinding. (Known)

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylindrical grinding device w Work 11 Table 16 Form grinding wheel 21, 22 AC servo motor 40 Control device 44 Memory 45 Central processing unit 50 Operation panel 60 Form rotary dresser

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3C043 AA04 CC03 3C047 CC11 EE11 EE16 FF09

Claims (3)

[Claims] 1. A cylindrical work-side end is gripped by a work gripper, and a forming grindstone that rotates while rotating the work is opposed to a rotation axis direction (Z-axis direction) of the work. Move it to work
The plunge grinding step of grinding the outer periphery of the work and the shifting step of retracting the formed grindstone from the work and then moving the work relative to the formed grindstone are repeated to grind the work outer periphery, thereby obtaining m An NC grinding apparatus for processing a cylindrical work having a plurality of repetitive profiles on its outer periphery, said NC grinding apparatus gripping a side end of the work and rotating the work about the Z axis. A gripping mechanism including a headstock and a tailstock that can move the gripping mechanism; and a table on which the gripping mechanism is mounted and which can reciprocate in a direction (Z-axis direction) parallel to a long axis of the work. A total rotary dresser having n repetitive profiles fixed on the same table fixed behind a headstock mounted on a table, and r repetitive profiles The workpiece is gripped by the gripping mechanism and the workpiece is held in the direction of the rotation axis (Z Direction)
An apparatus for grinding a cylindrical work having a repetitive profile, comprising: a moving mechanism for relatively moving the grinding wheel; (However, m is 6
N is an integer greater than or equal to 3 and smaller than m,
The value obtained by dividing m by n is 2 or more and 10 or less, r is an integer of 3 or more and is the same integer as n or less than n, and the value obtained by dividing n by r is 1 or more and 5 or less. . ). 2. An NC grinding apparatus according to claim 1,
A cylindrical work side end is gripped by a gripping mechanism composed of a headstock and a tailstock, and a forming whetstone that rotates while rotating the work is rotated in the direction of the rotation axis (Z-axis direction) of the work. A plunge grinding step of grinding the outer periphery of the work by moving the work relative to the workpiece, and a shift step of moving the work-forming grindstone backward from the work and moving the work relative to the work-forming grindstone are repeated. A shift plunge grinding method characterized by processing a cylindrical work having m repetitive patterns on the outer periphery of a work.
(However, the number of times of cutting and plunge grinding is the number of times that the value p obtained by dividing m by n is an integer, and the number of times that the value is a positive number having a decimal point is (p + 1) times. (The number of shifts q for moving the work with respect to the grindstone is one less than the number of plunge grinding operations.) 3. A table is moved before starting, during or after the grinding of the workpiece according to claim 2, and the rotary rotary dresser is moved in front of the general grinding wheel. Next, the rotating rotary wheel is rotating the rotating rotary wheel.
A dressing method for a grindstone, comprising dressing by contacting with a dresser. (However, if the value t obtained by dividing n by r is a positive number exceeding 1, the first text
After the dressing operation is completed, the forming wheel is retracted from the forming rotary dresser, and then the forming rotary dresser is positioned on the forming wheel portion that has not been dressed yet. The table is moved, and then the forming wheel is brought into contact with the rotating forming rotary dresser and dressing is performed. The retracting of the forming wheel, the table movement, and the total forming wheel are performed. The shift dressing operation of approaching and contacting the rotary rotor dresser is performed the number of times that the undressed portion is eliminated. When the value z obtained by dividing n by r is an integer, the number of shift dressing operations is (z
-1) times, if the value z is a positive number with a decimal point, it is z times. )