JPS629863A - Grinding and cutting machine with position detector - Google Patents

Abstract

PURPOSE:To enable a machine to efficiently further automatically perform cutting, by providing an external diameter measuring device, arithmetic control device, vertically moving device and a position detector, in the case of the grinding and cutting machine with the position detector for a pipe or the like. CONSTITUTION:If a swing arm 26 is swung by a piston cylinder driving mechanism 32, a machine, detecting an amount of rotation by a rotation detector 60 meshed with a pinion 58 in a supporting point while supervising an electric current in a motor 30 by a separately provided contact detecting device, in this way obtains an external diameter of a wheel 40. Similarly when a separately provided piston cylinder driving mechanism 20 longitudinally moves a saddle 16, the machine, detecting an amount of rotation by a rotation detector 68 meshed with a rack 64, obtains the displacement of the saddle. An arithmetic control device, not shown in the drawing, inputs these outputs, simultaneously a separate data input device inputs a diameter of a pipe and its quantity, and the machine, deciding whether or not the pipe can be cut only by a vertical movement of the wheel 40 and whether or not the pipe is cut also by a horizontal movement of the wheel from the diameter of the pipe and its quantity, outputs a signal to a driving gear and controls it to perform cutting.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a grinding and cutting device using a rotary grinding and cutting wheel, and furthermore, as mentioned above, it can automatically and efficiently cut materials such as pipes. The present invention relates to a grinding and cutting device of the type described above that can perform precise cutting.

Conventional pipes are manufactured in long lengths, cut to custom lengths, and shipped. When cutting a pipe to a given length in this way, a rotary grinding cutting wheel is generally used, which causes less deformation of the pipe (and allows for a relatively clean cut surface. In the case of cutting pipes with a cutting wheel, a rotary grinding cutting wheel is lowered vertically to cut a plurality of pipes lined up side by side.

However, in this rotary grinding and cutting wheel, the outer diameter of the wheel decreases each time a cutting is performed. Therefore, in the past, the origin position of the rotary grinding and cutting wheel was moved in stages to accommodate variations in the outer diameter of the wheel.

In addition, when the number of pipes lined up is not so large and the outer diameter of the rotary grinding cutting wheel is not reduced so much,
All pipes can be cut by simply lowering the rotary grinding cutting wheel vertically. However, when there are a large number of pipes lined up, or when the outer diameter of the rotary grinding and cutting wheel is decreasing, it is not possible to cut all the pipes simply by lowering the rotary grinding and cutting wheel vertically. Therefore, it was necessary to prepare a rotary grinding and cutting wheel with a larger diameter to match the number of pipes to be cut, or to replace it with a new rotary grinding and cutting wheel whose diameter had not yet been reduced.

Furthermore, if the diameter or number of pipes in the material to be cut changes, the range of movement of the rotary grinding and cutting wheel must be changed accordingly.

Conventionally, the various changes and corrections described above had to be made by an operator, resulting in low cutting efficiency.

Problems to be Solved by the Invention Therefore, the present invention solves the above-mentioned conventional problems.
It is an object of the present invention to provide a grinding and cutting device having a rotary grinding and cutting wheel capable of efficiently cutting pipes.

To be more specific, the present invention automatically adjusts the required travel distance of the rotary grinding and cutting wheel in response to a decrease in the outer diameter of the rotary grinding and cutting wheel, so that the operation can be performed in an optimal state with no waste. It is an object of the present invention to provide a grinding and cutting device that can perform cutting at all times.

Furthermore, even if the amount and size of the material to be cut changes, and even if the outer diameter of the rotary grinding and cutting wheel decreases, the present invention provides a means for adjusting the speed of the rotary grinding and cutting wheel in response to changes in these factors. It is an object of the present invention to provide a grinding and cutting device that can automatically correct the required movement amount and always perform cutting in an optimal state without wasteful operation.

Furthermore, the present invention aims to provide a grinding and cutting device that is almost completely automated except for replacing the rotary grinding and cutting grindstone.

Means for solving the problem, that is, the first grinding and cutting device according to the present invention includes a position detection device that detects the vertical position of the rotary grinding and cutting wheel, and a position detection device that measures the outer diameter of the rotary grinding and cutting wheel. An outer diameter measuring device is provided, and the arithmetic and control device measures the outer diameter and number of the material to be cut placed on the table, as well as the outer diameter of the rotary grinding and cutting wheel from the position detection device and the outer diameter measuring device. Based on the vertical position, the amount of descent of the rotary grinding cutting wheel required to cut the material on the table is calculated.
Controls the vertical movement device of the rotary grinding and cutting wheel.

Furthermore, the second grinding and cutting device of the present invention includes a position detection device that detects the vertical position of the above-described rotary grinding and cutting wheel, and an outer diameter measuring device that measures the outer diameter of the rotary grinding and cutting wheel. In addition, a reciprocating device that reciprocates the rotary grinding and cutting wheel in the horizontal direction and a horizontal position detection device that detects the horizontal position of the rotary grinding and cutting wheel are provided, and the arithmetic and control device is placed on the table. Based on the outer diameter and number of the material to be cut, as well as the outer diameter, vertical position, and horizontal position of the rotary grinding and cutting wheel from the vertical position detection device, horizontal position detection device, and outer diameter measurement device, The amount of descent and horizontal movement of the rotary grinding and cutting wheel necessary to cut the material to be cut above is calculated, and the vertical movement device and reciprocating device of the rotary grinding and cutting wheel are controlled.

As is clear from the above configuration, in the first grinding and cutting device according to the present invention, even if the outer diameter of the rotary grinding and cutting wheel decreases, the outer diameter measuring device measures the outer diameter and calculates the A control device controls the vertical motion device to lower the rotary grinding and cutting wheel by an amount necessary to completely cut all of the material to be cut placed on the table to compensate for the reduced outer diameter. Therefore, the material to be cut can be reliably cut and there is no waste in the operation.

Furthermore, in the second grinding and cutting device according to the present invention, not only the vertical displacement of the rotary grinding and cutting grindstone but also the horizontal displacement is controlled. Therefore, even if it is not possible to cut all the material to be cut by just lowering the rotary grinding and cutting wheel, the rotary grinding and cutting wheel can be lowered by the amount necessary to completely cut all the material to be cut that is placed on the table. , move horizontally. Therefore, the material to be cut can be reliably cut and there is no waste in the operation.

Embodiments Hereinafter, embodiments of the grinding and cutting apparatus according to the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a schematic side view of a rotary grinding and cutting wheel type grinding and cutting device according to the present invention, and FIG. 2 is a partial sectional view of the vicinity of the rotary grinding and cutting wheel of the grinding and cutting device shown in FIG. 3
1 is a schematic end view of the base of the grinding and cutting device of FIG. 1; FIG.

As shown in FIG. 1, the illustrated grinding and cutting device includes a base 10
A pair of parallel rails 12 are provided on the top of the base 10. A saddle 16 having rollers 14 that sandwich the rail 12 from above and below is provided. At the rear of the saddle 16, an arm 18 extends obliquely downward, and on the other hand, a piston cylinder drive mechanism 20 is horizontally fixed to the base 10, although no fixture is shown. The tip of a piston rod 20A extending from the drive mechanism 20 is connected to the tip of the arm 18 via a pin 20B. Thus, by operating the piston cylinder drive mechanism 20, the saddle 16 can reciprocate horizontally along the rail 12.

Furthermore, a pair of stands 22 are provided on the top surface of the base 10, and a support shaft 24 is fixed to the tips of the stands 22. A central portion of a swing frame 26 is rotatably attached to the support shaft 24. A plate 28 is fixed to the lower end side of the swing frame 26, and a drive motor 30 is attached thereon. Further, on the lower end side of the swing frame 26, another one is disposed diagonally.
Piston rod 32A of two piston cylinder drive mechanisms 32
is pivotally connected via a pin 34. The cylinder portion of the piston cylinder drive mechanism 32 is attached to the base 10, although a fixture is not shown. Therefore, by operating the piston cylinder drive mechanism 32, the swing frame 26 can swing around the support shaft 24.

A rotating shaft 36 is rotatably supported by a bearing 38 at an end of the swing frame 26 opposite to the motor 30. A rotary grinding and cutting whetstone 40 is removably fixed to one end of the rotating shaft 38 via a presser metal fitting 40A. At the other end of the rotating shaft 38,
A pulley 42 is fixed, and a belt 46 is suspended between it and another pulley 44 fixed to the rotating shaft of the motor 30. Therefore, by driving the motor 30, the rotary grindstone 40 is rotationally driven.

It is rotated and swung up and down in this way,
A work table 48 is arranged below the rotary grindstone 40 that is reciprocated in the horizontal direction, and materials to be cut, such as pipes 50, are arranged on the work table 48. To hold the pipe, a fixed side clamp 52 is provided on one side of the worktable 48 and a movable side clamp 56 operated by a piston cylinder drive mechanism 54 is provided on the other side. ing. And, although not shown,
A vertical clamp is also provided to hold down the pipe from above. Therefore, the pipe is firmly held by its vertical and side clamps 52 and 56 and is
Cut by 0.

The grinding and cutting device as described above further includes a pinion 58 fixed to the swing frame 26 coaxially with the support shaft 24,
A rotation detector 60 having a pinion that meshes with pinion 58 is mounted on a support arm 62 extending from stand 22 . Therefore, when the swing frame 26 swings about the support shaft 24, the pinion 58 rotates and the rotation detector 60 detects the amount of rotation.

Further, a rack 64 is provided on one side of the saddle 16, and another rotation detector 68 coupled to a pinion 66 that meshes with the rack 64 is attached to an arm 70 extending from the base 10. There is. When the saddle 16 is displaced in the horizontal direction by the piston cylinder drive mechanism 20,
Accordingly, the rack 64 moves, the pinion 66 coupled to the rotation detector 68 rotates, and the rotation amount is detected by the rotation detector 68. Then, the amount of displacement of the saddle 16 can be determined from the amount of rotation and the outer diameter of the pinion 66.

FIG. 4 is a block diagram showing an example of the configuration of a control device that controls the grinding and cutting device described above. The outputs of rotation detectors 60 and 68 are input to arithmetic and control unit 72 . The arithmetic and control device 72 further includes a data input device 74;
A contact detection device 76 is connected thereto. The contact detection device 76 is of a type that monitors the current of the motor 30 and detects an increase in the motor current when the rotary grindstone 40 contacts the material to be cut, for example. The arithmetic and control device 72 controls a drive device 78 that drives the piston-cylinder drive mechanism 32, a drive device 80 that drives the piston-cylinder drive mechanism 20, and a drive device 82 that drives the motor 30. In the illustrated embodiment, the drive device 7
8 and 80 control the opening/closing and opening degree of a solenoid valve (not shown) attached to the piston cylinder drive mechanism;
Further, the drive device 82 controls the on/off and rotational speed of the motor 30.

Before explaining the operation of the grinding and cutting device as described above, the background and principle of the present invention and the principles of measurement of various factors in the grinding and cutting device described above will be explained.

For example, as shown in FIG. 5(a), when the rotary whetstone 40 has a full diameter, it is possible to cut five pipes at once by just descending, but as shown in FIG. 5(b), the rotary whetstone 40 40
As the outer diameter of the pipes 50A and 50 on both sides decreases,
B cannot be completely cut. This is because even if the outer diameter of the rotary grindstone is larger than the width of the 5-wood pipes lined up, the lowering of the grindstone is restricted by the holding metal fitting 40A.

Therefore, as shown in FIG. 6, the rotary grindstone 40 is moved in the horizontal direction so that the pipe 50A at one end can be completely cut by descending. Then, the rotary grindstone is moved toward the opposite end of the pipe. By doing this, all five pipes can be completely cut. The present invention is basically based on this idea.

In order to cut all the pipes by moving the whetstone horizontally after descending as described above, the initial position of the descent of the whetstone and the amount of horizontal movement must be determined. That is, as shown in FIG. 6, it is necessary to find the distance LI between the central axis of the whetstone 40 and the outer edge of one of the pipes 50A, and the horizontal displacement ffi L2 of the whetstone after descending. . These values can be calculated if the outer diameter of the rotary grindstone, the outer diameter of the pipes, and the number of pipes are given.

Therefore, how to determine the outer diameter of the rotating grindstone will be explained next.

The rotating whetstone has a limit to its ascent due to the restrictions of the mechanical structure shown in FIG. 1, and also has a limit to its descent due to restrictions such as the holding fixture of the rotary whetstone. Therefore, as shown in FIGS. 7(a) and (b), the maximum raised position of the rotary grindstone measured from the table 48 is defined as HllaM, and the maximum lowered position measured from the table when there is no material to be cut on the table 48. will be explained below as Htain.

In this case, the maximum lowering position Hwin is % of the diameter r of the presser metal fitting 4OA of the rotary grindstone. The maximum ascending position Hmax and the maximum descending position Hm1h are detected by the rotation detector 60.
It can be detected by

First, as shown in FIG.
By detecting the amount of descent of the rotary whetstone from X to when the rotary whetstone contacts the pipe, the outer diameter R of the rotary whetstone can be determined from the following formula.

Hmax='/AR+D+d m - (1) However, d=outside diameter of the pipe, that is, the maximum lifting position HIIaK of the rotary grindstone is determined in advance, and by giving the outside diameter d of the pipe, the contact detection device 78 described above can detect the motor. The outer diameter R of the rotary whetstone can be determined from the output of the rotation detector 60 when the motor current increases when the rotary whetstone 40 contacts the material to be cut.

When cutting the same pipe one after another to a given length, it is not necessary to raise the rotary grindstone to its maximum raised position.

In other words, it is sufficient to raise the rotary grindstone to the extent that the distance necessary for sequentially feeding the pipes can be secured between it and the table. Therefore, in the present invention, as shown in FIG.
When the distance between the outer edge of the whetstone and the table reaches a predetermined distance P, the ascent of the whetstone is stopped. The upper limit position of the whetstone P
can be expressed as follows.

H,,,=P + 8R+ h---... (2) However, hffillM" is the distance from the maximum raised position HIRaM of the center of the grinding wheel when it is at the upper limit position P of the grinding wheel, and the above h raax is the rotation It can be measured based on the output of the detector 60.

On the other hand, when cutting a pipe, the required lowering amount and horizontal displacement amount of the rotary grindstone are determined from the diameter of the rotary grindstone, the diameter and the number of pipes.

As shown in FIG. 10, when n pipes of outer diameter d are lined up on a table and cut with a rotary grindstone of diameter R, the lower limit position h1 of the grindstone descends from the maximum ascending position HIIilX.
．． ．． is expressed as follows.

H□−=h−t,,+H,t,+d×α・・
(3) However, α=margin for control and the width 2a to be cut at that time has the following relationship.

a2=(zR)2+ (H+*tn + a + d)
2...(4) And 2a<nd...(5) If the rotary grindstone is lowered to its lowering limit position h min , it is not possible to cut all of the cutting, and horizontal movement is required. Therefore, in such a case, if the distance from one of the clamps on the table to the position where the rotating grindstone should start horizontal movement is defined as X, then X=a, and the lowering limit position of the rotating grindstone at that time is 1.

is, fi+atn=H□EH,,ll,+d+α,
In addition, the required horizontal movement scene β of the rotating grindstone is f=nd+β
-2a=(6) However, β=cutting margin.

However, when the number of pipes is small or the outer diameter of the rotary grindstone is large, not only is horizontal movement not necessary, but there is no need to lower the rotary whetstone to the lowering limit position h min. That is, when 2a is larger than nd, as shown in FIG. 11, the required descending distance from the maximum ascending position H□8 can be expressed as follows.

h = H, , -h'+α --(7) However, (h'
-y2d)2=(zR)2-('/And)'' The control device shown in FIG. 4 controls the grinding and cutting device shown in FIG. 1 based on the control principle described above.

That is, the rotary grindstone 40 is moved to its maximum raised position Hml1M.
and the maximum lowering position Hmin, and the rotation detector 6
0 to detect the data and store it in the arithmetic and control unit 72. On the other hand, the outer diameter of the pipe to be cut and the number of pipes to be lined up on the table 48 are inputted to the arithmetic and control unit 72 via the data input device 74. Make me remember. If the rotary grindstone 40 has just been replaced, its outer diameter R8 is input via the data input device 76. On the other hand, if it has already been used, the outer diameter R8 measured during the previous cutting operation has already been stored.

First, when the operation is started, the arithmetic and control unit 72 uses the formula (
Perform the calculations in 4) and (5) to determine whether all the pipes can be cut by lowering only, and if possible, calculate the required lowering amount h1 based on equation (7) and If possible, the lowering limit position h is determined based on equation (6) and others.
1, the horizontal movement start position X and the water movement distance l are calculated. On the other hand, the arithmetic control device 72 controls the drive device 82 to rotate the motor 3o.

If all the pipes can be cut by lowering only, the drive device 78 is controlled to project the piston rod 32A of the piston cylinder drive mechanism 32, and the swing frame 26 is moved to the first position.
While rotating counterclockwise in the figure and monitoring the output of the rotation detector 60, the rotary grindstone 4o is lowered by a required lowering amount h1. Thereby, the pipe 50 is placed on the table 48.
are all disconnected.

In the lowering process of the rotary whetstone 40, when the lower edge of the rotary whetstone 40 contacts the pipe, the contact detection device 76 that monitors the current of the motor 3o detects the motor current when the rotary whetstone 4o contacts the material to be cut. detects an increase in the amount and issues a signal. The arithmetic and control device 72 that receives the signal takes in the output of the rotation detector 6o at that time, and calculates the outer diameter RI of the rotary grindstone 4o according to the above-mentioned formula (1). That Ro
is used as data for the next cutting operation.

When the cutting is completed, the arithmetic and control device 72 causes the drive device 78 to
is operated to retreat the piston rod 32A of the piston cylinder drive mechanism 32, rotate the swing frame 26 clockwise in FIG. 1, and raise the rotary grindstone 40 to the grindstone upper limit position h□8. In the meantime, based on the measured value R1 of the outer diameter of the rotary grindstone measured in the above cutting process, calculate the above equations (4) and (5) to determine whether all the pipes can be cut by just descending. judge, and
Calculate the necessary lowering amount h2 during the cutting operation if possible.

Meanwhile, the cut section of the pipe is removed from the table, the pipe is fed in its axial direction, and the new section to be cut is placed under the rotating grindstone.

The drive device 78 is operated again to cause the piston rod 32A of the piston cylinder drive mechanism 32 to protrude, and the swing frame 26 is rotated counterclockwise in FIG. 40 by the required descending amount h2, and place the pipe 5 on the table 48.
Cut 0. Meanwhile, the outer diameter R+ of the rotary grindstone is measured for the next cutting process.

As a result of calculating formulas (4) and (5) above, if it is determined that all pipes cannot be cut by descending only, calculate the descending limit position, n, horizontal movement start position x 1, and horizontal movement distance 11. do.

As a result, the arithmetic and control device 72 controls the drive device 80 to cause the piston cylinder drive mechanism 20 to retreat the rotary grindstone 40 to the horizontal movement start position XI while monitoring the output of the rotation detector 68. Next, the drive device 78 is controlled while monitoring the output of the rotation detector 60, and the rotary grindstone 40 is lowered to the lowering limit position . . . In by the piston cylinder drive mechanism 32.

When the lower edge of the rotating grindstone 40 comes into contact with the pipe during the process, the contact detection device 76 that monitors the current of the motor 30 detects an increase in the morph current when the rotating grindstone 40 contacts the material to be cut. and emit a signal. The arithmetic and control device 72 that received the signal then takes in the output of the rotation detector 60, and according to the above-mentioned formula (1), the arithmetic and control device 72
Calculate the outer diameter R+ of 0.

When the rotary whetstone 40 descends to the lowering limit position h m1n, the drive device 80 is controlled again while monitoring the output of the rotation detector 68, and the piston cylinder drive mechanism 20 moves the rotary whetstone 40 by a horizontal movement distance Il. , only move forward.

When the cutting is completed, the arithmetic and control device 72 causes the drive device 78 to
and 80 to move the rotary grindstone 40 to the grindstone upper limit position h3.
．． 8 and return to the initial horizontal position. In the meantime, based on the measured value Rt of the outer diameter of the rotary grindstone measured in the above cutting process, calculate the above equations (4) and (5) to determine whether all the pipes can be cut by just descending. If it is determined that all the pipes cannot be cut by only descending, the descending limit position h m l n
Then, the horizontal movement start position x2 and horizontal movement distance 12 are calculated.

Meanwhile, the cut section of the pipe is removed from the table, the pipe is fed in its axial direction, and the new section to be cut is placed under the wheel and prepared for the next cut. . Thereafter, the above-described cutting process is repeated.

Although the embodiments of the grinding and cutting apparatus according to the present invention have been described above, the descending speed of the rotary grindstone does not need to be the same before and after the rotary grindstone contacts the material to be cut. It is rather inefficient to lower the rotary grindstone until it contacts the material to be cut by the swing frame at the same speed as the lowering speed during the cutting operation. Therefore, the arithmetic control device 72 controls the drive device 78 that drives the piston cylinder drive mechanism 32,
The rotary whetstone is lowered at a relatively high speed until just before the rotary whetstone contacts the material to be cut, and thereafter the rotary whetstone is lowered at a speed optimal for the material to be cut and the rotary whetstone. Furthermore, it is preferable to raise the rotary grindstone again at a high speed after cutting is completed.

Further, in the above embodiment, the contact of the rotating grindstone is controlled by the motor 30.
It is detected by changes in the drive current. However, when the rotating grindstone hits the material to be cut, sparks are generated.

Therefore, contact with the rotating grindstone may be detected by detecting the spark.

Furthermore, the cutting action of the grinding wheel is performed by its outer edge. In other words, the cutting speed is determined by the peripheral speed of the grindstone. Therefore, the rotational speed of the motor 30 may be controlled by controlling the drive device 82 so as to maintain the optimum circumferential speed based on the outer diameter of the rotary grindstone.

Effects of the invention As is clear from the above explanation, according to the present invention,
The amount of displacement of the rotary whetstone is automatically corrected in response to the decrease in the outer diameter of the rotary whetstone, so that cutting can always be performed in an optimal state with no waste in operation.

Also, even if the amount or size of the material to be cut changes, and
Even if the outer diameter of the rotary whetstone decreases, the amount of displacement of the rotary whetstone is automatically corrected in response to fluctuations in these factors, so that cutting can always be performed in an optimal state with no waste in operation.

Therefore, the operator can automatically cut the material by simply inputting the outer diameter and number of the material to be cut.

[Brief explanation of drawings]

1 is a schematic side view of a rotary grinding and cutting wheel type grinding and cutting device according to the present invention; FIG. 2 is a partial sectional view of the vicinity of the rotary grinding and cutting wheel of the grinding and cutting device shown in FIG. 1; 3 is a schematic end view of the base of the grinding and cutting device shown in FIG. 1, and FIG. 4 is a block diagram showing a configuration example of a control device for controlling the grinding and cutting device described above. 11th
The figure is a diagram illustrating the principle of control of the present invention. [Main reference numbers] 10...Base 1O112...Rail 1214...Roller 14.16...Saddle 18...Arm 20.32...Piston cylinder station movement mechanism 22...Stand, 24...Spindle 26・・Swing frame, 30・・Motor 36・・Rotating shaft, 40・・Rotary grindstone 42. 44・・Pulley, 48・・Work table 50・
・Pipe, 52.56・・Side clamp 58.66・
- Pinion, 60.68... Rotation detector 64... Rack, 72... Arithmetic control device 74... Data input device 76... Contact detection device 78.80.82... Drive device

Claims (8)

[Claims] (1) A rotary grinding and cutting wheel, a rotary drive device that drives the rotary grinding and cutting wheel, a vertical movement device that moves the rotary grinding and cutting wheel up and down, and detecting the vertical position of the rotary grinding and cutting wheel. a position detection device for measuring the outer diameter of the rotary grinding and cutting wheel; a table for placing the material to be cut; the outer diameter and number of the material to be cut placed on the table; and the position of the material. Based on the outer diameter and vertical position of the rotary grinding and cutting wheel from the detection device and the outer diameter measuring device, the amount of descent of the rotary grinding and cutting wheel necessary to cut the material on the table. Calculate,
A grinding and cutting device with a position detection device, comprising: an arithmetic and control device that controls a vertical movement device of the rotary grinding and cutting grindstone. (2) The vertical movement device is a swing device that draws a substantially vertical trajectory, and the position detection device is a rotation detector that detects rotation of the swing device. The grinding and cutting device described in item 1). (3) Claim (2) characterized in that the swing device is driven by a piston cylinder mechanism.
Grinding and cutting equipment as described in section. (4) The outer diameter measuring device measures based on the output of the position detecting device when the rotary grinding and cutting wheel comes into contact with the material to be cut. ) to (3). (5) A rotary grinding and cutting wheel, a rotary drive device that drives the rotary grinding and cutting wheel, a vertical movement device that moves the rotary grinding and cutting wheel up and down, and detecting the vertical position of the rotary grinding and cutting wheel. a reciprocating device that horizontally reciprocates the rotary grinding and cutting whetstone; a horizontal position detecting device that detects the horizontal position of the rotary grinding and cutting whetstone; and a horizontal position detection device that detects the horizontal position of the rotary grinding and cutting whetstone. an outer diameter measuring device for measuring the outer diameter of the cut material, a table on which the material to be cut is placed, the outer diameter and number of the material to be cut placed on the table, the vertical position detecting device, the horizontal position detecting device, and the outer diameter of the cut material. Based on the outer diameter and vertical and horizontal positions of the rotary grinding and cutting wheel from the diameter measuring device, determine the descending amount and horizontal position of the rotary grinding and cutting wheel necessary to cut the material on the table. A grinding and cutting device with a position detection device, comprising: an arithmetic and control device that calculates the amount of directional movement and controls a vertical movement device and a reciprocating device of the rotary grinding and cutting grindstone. (6) The vertical movement device is a swing device that draws a substantially vertical trajectory, and the vertical position detection device is a rotation detector that detects rotation of the swing device. The grinding and cutting device described in (5). (7) The grinding and cutting device according to claim (6), wherein the swing device and the reciprocating device are driven by a piston cylinder mechanism. (8) The outer diameter measuring device measures based on the output of the vertical position detecting device when the rotary grinding and cutting wheel comes into contact with the material to be cut. The grinding and cutting device according to any one of items 5) to (7).