JP2000263394A - Centerless grinding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a centerless grinding machine which can infeed-grind plural works to different ground sizes and also provide a centerless grinding machine which can infeed-grind pulural works to different ground surfaces at the same time. SOLUTION: A grinding wheel 11 in which the kind of grind stone, dressing condition or tooling condition is different is provided excepting the grinding wheel and adjusts wheel 22 having the facing position relation. The other adjust wheel 21 is provided on the facing position of the other grinding wheel 11. A carrying positioning device T1 arranges respective works W1, W2 on the holding edge and fixes the axial direction position of respective works W1, W2 per the grinding wheels 11, 12 and adjusts wheels 21, 22 having the facing position relation. Individual works W1, W2 are ground simultaneously by respective grinding wheels 11, 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centerless grinding machine for performing in-feed grinding of a shaft workpiece such as a piston pin.

[0002]

2. Description of the Related Art Conventionally, there is a centerless grinding machine as one of the facilities for grinding a cylindrical surface of a workpiece such as a piston pin. Since the centerless grinding machine has a small mounting error of the workpiece, even if the grinding wheel and adjustment wheel are completely adjusted, even unskilled workers can work automatically. Suitable for mass production of the same workpiece.

[0003] The grinding method of the centerless grinding machine includes in-feed grinding in which the workpiece does not move in the axial direction of the workpiece during grinding, and through-feed grinding in which the workpiece moves in the axial direction of the workpiece during grinding. There is. For example, a centerless grinding machine that performs through feed grinding is disclosed in Japanese Unexamined Patent Publication No. Hei.
No. 4 discloses a centerless grinding machine. In this centerless grinding machine, a plurality of grindstone layers set so that the finishing accuracy gradually increases along the transfer direction of the work are sectioned and arranged on the outer periphery of the grindstone, so that it is troublesome to replace the grindstone. A series of processing from rough finishing to super-raising can be performed quickly and reliably without performing a complicated operation.

[0004]

However, in the prior art centerless grinding machines, the ground finish dimensions and the ground surface of the ground workpiece are all the same in any of the grinding methods. Therefore, if it is desired to manufacture workpieces with different grinding finish dimensions or grinding finish surfaces in the same period, it is necessary to replace or adjust the grinding wheel or adjustment wheel again according to the grinding finish dimensions or grinding finish surface. there were. Further, since such adjustment requires a considerable amount of work and time, the lead time of the workpiece may be prolonged, which may adversely affect the subsequent production process.

In particular, recently, from the standpoint of designing a production process in consideration of the tendency to produce a large variety of products in small quantities, the grinding finish size or the grinding finish surface differs even in the grinding process using a centerless grinding machine. There are many demands for securing the ability to manufacture workpieces during the same period. It seems that such a request can be dealt with simply by purchasing a plurality of centerless grinding machines. It will work as a negative factor.

Accordingly, in order to cope with the recent tendency of high-mix low-volume production, a centerless grinding machine capable of simultaneously grinding a plurality of workpieces having different grinding finish dimensions or grinding finish surfaces has been desired. However, in a centerless grinding machine that performs through-feed grinding, the workpiece moves in the axial direction of the workpiece while being ground by the grinding wheel, and therefore, due to its structure, the grinding finish dimensions and the grinding finish surface of the ground workpiece. It was inevitable that all would be the same. On the other hand, there is no centerless grinding machine that performs in-feed grinding that can simultaneously grind a plurality of workpieces having different grinding finish dimensions or grinding finish surfaces.

Accordingly, the present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a centerless grinding machine for simultaneously performing infeed grinding of a plurality of workpieces to different grinding finish dimensions. I do. It is another object of the present invention to provide a centerless grinding machine for simultaneously performing infeed grinding of a plurality of workpieces on different ground surfaces.

[0008]

According to the first aspect of the present invention, there is provided a grinding wheel whose peripheral speed is controlled to be equal to a grinding speed, and a grinding wheel opposed to the grinding wheel. An adjusting wheel provided and rotationally controlled to a peripheral speed within a predetermined ratio range with a peripheral speed of the grinding wheel, a holding blade provided between the grinding wheel and the adjusting wheel, and the grinding wheel. Transport means for taking the work in and out between the adjusting wheels, and positioning means for fixing the position of the workpiece in the axial direction between the grinding wheel and the adjusting wheel, and While rotating the workpiece mounted on the holding blade with the grinding force of the grinding wheel, braking with the friction force of the adjusting wheel and the holding blade, and receiving the thrust generated in the workpiece by the positioning means. , The cylindrical surface of the workpiece A centerless grinding machine for infeed grinding, wherein a plurality of steps are formed at opposing positions of the grinding wheel and the friction wheel, respectively, and the step of the grinding wheel and the adjusting wheel which are opposed to each other are formed. The transfer means arranges each work piece on the holding blade every time between the steps, and the positioning means moves each work piece between each step of the grinding wheel and the step of the adjusting wheel which are opposed to each other. By fixing the axial position of the workpiece, a plurality of workpieces are simultaneously subjected to infeed grinding to different grinding finish dimensions.

According to a second aspect of the present invention, there is provided the centerless grinding machine according to the first aspect, wherein any one of the kind of the grinding wheel, the dressing condition, and the truing condition is:
The difference in each stage of the grinding wheel causes a difference in the finished surface of each workpiece that has been simultaneously subjected to infeed grinding.

[0010] The invention according to claim 3 is a grinding wheel, the peripheral speed of which is rotationally controlled to the grinding speed, and a grinding wheel provided opposite to the grinding wheel and having a predetermined ratio with the peripheral speed of the grinding wheel. An adjusting wheel that is rotationally controlled to a peripheral speed within the holding wheel, a holding blade provided between the grinding wheel and the adjusting wheel, and a transfer unit that takes in and out the workpiece between the grinding wheel and the adjusting wheel. And positioning means for fixing the position of the workpiece in the axial direction between the grinding wheel and the adjusting wheel, wherein the workpiece mounted on the holding blade by the transporting means is mounted on the grinding wheel. While rotating with the grinding force of the above, braking by the friction force of the adjusting wheel and the holding blade, and receiving the thrust generated in the workpiece by the positioning means, there is no center for infeed grinding the cylindrical surface of the workpiece. A grinding machine, The type of the grinding wheel for the grinding wheel, one of the dressing conditions or the truing conditions is different from another grinding wheel, and includes another adjustment wheel provided to face the other grinding wheel, The transfer means arranges each workpiece on the holding blade between the grinding wheel and the adjusting wheel in the opposing positional relationship, and the positioning means in each of the positions between the grinding wheel and the adjusting wheel in the opposing positional relationship. Is characterized in that a plurality of workpieces are simultaneously subjected to in-feed grinding on different ground surfaces by fixing the axial position of each workpiece.

According to a fourth aspect of the present invention, there is provided the centerless grinding machine according to the third aspect, wherein each of the distances between the grinding wheel and the adjusting wheel in the opposite positional relationship is different, so that the infeed grinding is simultaneously performed. It is characterized in that each finished workpiece has a different grinding finish dimension.

According to a fifth aspect of the present invention, there is provided the centerless grinding machine according to the third or fourth aspect, wherein the first gear mechanism provided between the respective grinding wheels and the respective adjustments are provided. A second gear mechanism provided between the wheels to control the rotational speed of the grinding wheel and the gear ratio of the first gear mechanism to adjust the peripheral speed of another grinding wheel; The peripheral speed of another adjusting wheel is adjusted by rotation control and a gear ratio of the second gear mechanism.

According to a sixth aspect of the present invention, there is provided the centerless grinding machine according to any one of the first to fifth aspects, wherein each of the workpieces which are simultaneously in-feed ground is subjected to predetermined grinding. It is characterized by realizing the finished dimensions and the finished surface in each step of processing. According to a seventh aspect of the present invention, there is provided the centerless grinding machine according to the sixth aspect, wherein the transfer means takes in and out the workpiece in an order based on the grinding process.

According to an eighth aspect of the present invention, there is provided the centerless grinding machine according to any one of the first to seventh aspects, wherein the work is fixed at a predetermined axial position by the positioning means. A sizing device is provided for ensuring the grinding accuracy of the workpiece, and the sizing device also ensures the grinding accuracy of another workpiece to be in-feed-ground at the same time.

The centerless grinding machine of the present invention having such specific features performs infeed grinding in which the workpiece does not move in the axial direction during grinding, and further performs infeed grinding of a plurality of workpieces simultaneously. Is what you do. To do so, first, a space between the grinding wheel and the adjusting wheel is larger than the diameter of the workpiece, and the workpiece is placed on the holding blade by the transporting means.

In the case where a plurality of steps are formed at positions opposing the grinding wheel and the adjusting wheel, respectively, between the steps of the grinding wheel and the adjusting wheel which are in opposition to each other,
The transport means places the workpiece on the holding blade. This allows
A plurality of workpieces can be mounted on the holding blade.

After that, when the gap between the grinding wheel and the adjusting wheel is closed and the relative cutting and feeding is performed, the grinding wheel is placed on the holding blade by contact (grinding force) with each stage of the rotating grinding wheel. Each of the workpieces is rotated. On the other hand, the rotational motion of each workpiece is braked by the contact (frictional force) between the holding blade and each stage of the rotating adjusting wheel. As a result, each workpiece rotates at a speed substantially equal to the peripheral speed of each stage of the adjusting wheel.

At this time, each work tends to move in the axial direction by the thrust generated by the rotational movement. However, the thrust of each workpiece is received by the positioning means, so that the position of each workpiece in the axial direction can be fixed between the steps of the grinding wheel and the adjustment wheel which are in opposition to each other. Can be. Accordingly, each workpiece rotates in a state of contacting each stage of the grinding wheel and each stage of the adjusting wheel without moving in the axial direction. The thrust of the workpiece may be received by using a step between the grinding wheel and the adjusting wheel. Further, even if no thrust is generated in each workpiece, if the positioning means is provided, the position of the workpiece in the axial direction can be reliably fixed.

As described above, each workpiece is simultaneously ground at each stage of the grinding wheel. At this time, since the intervals of the step of the grinding wheel and the step of the adjustment wheel in the opposing positional relationship are different, a plurality of workpieces simultaneously ground at each step of the grinding wheel are ground to different grinding finish dimensions. . Then, when the cut feed reaches a predetermined amount and is stopped, and after the subsequent spark-out grinding is completed, a gap between the grinding wheel and the adjusting wheel is larger than the diameter of the workpiece, and each workpiece on the holding blade is transported. Take out by means. This allows a plurality of workpieces to be simultaneously in-feed ground to different grinding finish dimensions.

Further, if any one of the type of the grinding wheel, the dressing condition and the truing condition is different in each stage of the grinding wheel, the respective workpieces which are simultaneously infeed-ground to different grinding finish dimensions can be obtained. , Their ground finish can also be different.

Further, another grinding wheel having a different kind of grinding wheel, dressing condition or truing condition is newly provided, and another adjusting wheel is newly provided at a position facing the other grinding wheel. In this case, the transporting means arranges the workpiece on the holding blade between each of the grinding wheel and the adjusting wheel in the opposing positional relationship. Thereby, a plurality of workpieces can be placed on the holding blade.

Thereafter, the space between the grinding wheel and the adjusting wheel is closed, and when relative cutting is performed, the wafer is placed on the holding blade by contact (grinding force) with each rotating grinding wheel. Each workpiece rotates. On the other hand, the rotational movement of each workpiece is braked by the contact (frictional force) between the holding blade and each rotating adjusting wheel. As a result, each workpiece rotates at substantially the same speed as the peripheral speed of each adjusting wheel.

At this time, each workpiece tends to move in the axial direction by the thrust generated by the rotational movement. However, the thrust of each workpiece is received by the positioning means, whereby the position of each workpiece in the axial direction can be fixed between the grinding wheel and the adjusting wheel which are opposed to each other. Therefore, each workpiece rotates in a state of contacting each grinding wheel and each adjustment wheel without moving in the axial direction. Even if no thrust is generated in each workpiece, if the positioning means is provided, the position of the workpiece in the axial direction can be reliably fixed.

As described above, each workpiece is simultaneously ground by each grinding wheel. At this time, the type of grinding wheel,
Since either one of the dressing conditions or the truing conditions is different in each grinding wheel, a plurality of workpieces simultaneously ground by each grinding wheel are ground to different grinding finish surfaces. Then, when the cut feed reaches a predetermined amount and is stopped, and after the subsequent spark-out grinding is completed, a gap between the grinding wheel and the adjusting wheel is larger than the diameter of the workpiece, and each workpiece on the holding blade is transported. Take out by means. This allows
Multiple workpieces can be simultaneously in-feed ground to different ground finishes.

Further, if the distance between the grinding wheel and the adjusting wheel in the opposite positional relationship is made different, the respective workpieces in-feed ground simultaneously on different ground surfaces can be
Their grinding finish dimensions can also be different. At this time, when each grinding wheel and each adjustment wheel are adjacent to each other, by using the step formed in the adjacent portion to receive the thrust of the workpiece, the grinding wheel and the adjusting wheel are in an opposing positional relationship. The position of each workpiece in the axial direction may be fixed between the adjustment wheels.

It should be noted that simultaneous infeed grinding of a plurality of workpieces to different grinding finish dimensions may mean that some of the plurality of workpieces simultaneously infeed ground have different grinding finish dimensions. Similarly, simultaneous infeed grinding of a plurality of workpieces to different ground surfaces may mean a case in which some of the plurality of workpieces simultaneously infeed ground have different ground surfaces.

In addition, the fact that any one of the grinding wheel type, dressing condition and truing condition is different in each stage of the grinding wheel is that the type of the grinding wheel in some of the stages of the grinding wheel, One of the dressing conditions and the truing conditions may be different. Similarly, the difference between the distance between the grinding wheel and the adjusting wheel in the opposing positional relationship may be the case where some of the intervals between the grinding wheel and the adjusting wheel in the opposing positional relationship are different.

That is, in the centerless grinding machine of the present invention, when a plurality of steps are formed at opposing positions of the grinding wheel and the adjusting wheel, respectively, the step of the grinding wheel and the adjusting wheel which are opposed to each other are formed. The transfer means arranges each work piece on the holding blade for each of the steps, and the positioning means adjusts the axial direction of each work piece between the steps of the grinding wheel and the adjustment wheel which are in opposition to each other. By fixing the position, at each stage of the grinding wheel with a different distance from the stage of the adjustment wheel in the opposing positional relationship,
Since it is possible to grind individual workpieces simultaneously,
Multiple workpieces can be simultaneously in-feed ground to different grinding finish dimensions.

Further, if any one of the grinding wheel type, dressing condition and truing condition is different in each stage of the grinding wheel, each workpiece which has been infeed-ground simultaneously to different grinding finish dimensions can be obtained. , Their ground finish can also be different.

Further, another grinding wheel having a different type of grinding wheel, dressing condition or truing condition is newly provided, and another adjusting wheel is newly provided at a position facing the other grinding wheel. In the case, the conveying means arranges each work piece on the holding blade between the grinding wheel and the adjusting wheel in the opposed positional relationship, and positions the workpiece between the grinding wheel and the adjusting wheel in the opposed positional relationship. By means of fixing the axial position of each workpiece, it is possible to simultaneously grind individual workpieces with each grinding wheel having one of the types of grinding wheels, dressing conditions or truing conditions different. Therefore, a plurality of workpieces can be simultaneously subjected to infeed grinding on different ground surfaces.

Further, if the distance between the grinding wheel and the adjusting wheel in the opposed positional relationship is different, each workpiece which has been infeed-ground to different ground surfaces at the same time,
Their grinding finish dimensions can also be different.

Further, by providing the first gear mechanism between the respective grinding wheels, the peripheral speed of another grinding wheel can be adjusted by controlling the rotation of the grinding wheel and the gear ratio of the first gear mechanism. Therefore, the grinding speed can be controlled for each grinding wheel, and by providing the second gear mechanism between the adjusting wheels, the rotation control of the adjusting wheel and the second speed can be controlled.
Since the peripheral speed of the other adjusting wheels can be adjusted by the gear ratio of the gear mechanism, the peripheral speed of each workpiece can be controlled for each workpiece, and therefore, the grinding wheel wheels that are opposed to each other are in a positional relationship. The grinding speed and the peripheral speed of the workpiece can be set to an optimal relationship within a predetermined ratio range in accordance with the grinding conditions (for example, workpiece material, surface roughness, etc.) for each of the wheel and the adjustment wheel.

Further, by providing the first gear mechanism between the respective grinding wheels, the respective grinding wheels are independently supported for rotation, and the second gear mechanism is connected to the respective adjusting wheels. Since the adjustment wheels are separately supported by being provided between the grinding wheels, the grinding conditions (for example, rough grinding,
In accordance with the finish grinding, etc.), the structure of the rotation support (for example,
Double-sided, cantilevered, etc.)
It becomes possible to set the rigidity of the grinding wheel and the adjusting wheel.

When each workpiece that has been subjected to in-feed grinding at the same time realizes the finished dimensions and the finished surface of each step of the predetermined grinding, each step of the predetermined grinding is performed by one step. It can be performed with a centerless grinding machine for in-feed grinding.

Further, if the transfer means takes in and out the workpiece in an order based on a predetermined grinding process,
Since the grinding finish dimensions and the finished surface of the workpiece discharged from the centerless grinding machine of the present invention by the conveying means are all the same, the effect of the centerless grinding machine of through feed grinding described in the section of the prior art (ie, , A series of processes from rough finishing to super-raising can be performed quickly and reliably without the troublesome work of replacing the grinding wheel) even in the centerless grinding machine for in-feed grinding. Can be.

Further, since all the workpieces whose axial positions are fixed by the positioning means are simultaneously subjected to in-feed grinding, the grinding precision of each workpiece which is simultaneously subjected to in-feed grinding has relevance. With a sizing device that ensures the grinding accuracy of the workpiece fixed at the predetermined axial position by the positioning means, it is possible to simultaneously secure the grinding accuracy of other workpieces that are infeed-ground simultaneously, The grinding accuracy of all the workpieces to be subjected to infeed grinding can be ensured by one sizing device.

[0037]

Embodiments of the present invention will be described below with reference to the drawings. First, the centerless grinding machine of the first embodiment will be described. FIG. 1 is a basic configuration diagram of a centerless grinding machine C1 according to the first embodiment. The centerless grinding machine C1 according to the first embodiment is a centerless grinding machine that simultaneously performs infeed grinding of workpieces W1 and W2 having different diameters.

The two grinding wheels 11, 12 differ from one another in the type of grinding wheel, dress condition, and truing condition. The grinding wheel 11 is for rough grinding, and the grinding wheel 12 is for finish grinding. The peripheral speed of the grinding wheel 12 for finish grinding is adjusted to a predetermined grinding speed by the rotation of the drive motor M1 for the grinding wheel being transmitted to the rotating shaft 15 via the V-belt V1. Controlled. Also, a grinding wheel 1 for rough grinding
The rotation speed of the peripheral speed of 1 is controlled by transmitting the rotational movement of the grinding wheel 12 for finish grinding to the rotating shaft 14 via the first gear mechanism G1.

The two adjusting wheels 21 and 22 correspond to the two grinding wheels 11 and 12 which are opposed to each other, and one of the dressing condition and the truing condition is different. is there. The adjustment wheel 21 is located at a position facing the grinding wheel 11 for rough grinding, and the adjustment wheel 22 is located at a position facing the grinding wheel 12 for finish grinding. The distance H between the grinding wheel 11 for rough grinding and the adjusting wheel 21
(See FIG. 2) is larger than the interval H between the grinding wheel 12 for finish grinding and the adjusting wheel 22. Further, the peripheral speed of the adjustment wheel 22 for finish grinding is rotationally controlled by transmitting the rotational motion of the drive motor M2 for the adjustment wheel to the rotating shaft 25 via the V-belt V2. The peripheral speed of the adjusting wheel 21 for rough grinding is rotationally controlled by transmitting the rotational motion of the adjusting wheel 22 for finish grinding to the rotating shaft 24 via the second gear mechanism G2.

FIG. 2 shows a grinding wheel 11 for rough grinding.
2 shows a space between the control wheel 21 and the adjustment wheel 21. The grinding wheel 11 for rough grinding includes a flange 17 on which a grinding wheel 18 is mounted.
Is fastened to the rotating shaft 14. The adjusting wheel 21 for rough grinding has a structure in which a flange 27 to which an adjusting grindstone 28 is attached is fastened to a rotating shaft 24.
A holding blade B on which the workpiece W1 is placed is provided between the grinding wheel 11 for rough grinding and the adjusting wheel 21. Further, a grinding wheel 12 and an adjusting wheel 22 for finish grinding are provided.
Has a similar structure, and a holding blade B on which the workpiece W2 is placed is provided between the grinding wheel 12 for finish grinding and the adjustment wheel 22. The holding blade B is shown only in FIG. 2 in order to make the display contents of the drawing easy to understand.

Although not shown, two grinding wheels 1
Reference numerals 1 and 12 are fixed on the bed, and two adjustment wheels 2
The holding blades 1, 22 and the holding blade B are fixed to a slide that slides on a guide surface on the bed. Therefore, the two adjusting wheels 21, 2
2 and the holding blade B move integrally on the bed of the centerless grinding machine C1.

The transport positioning device T1 is an automatic device that serves both as a transport unit and a positioning unit. Multiple nails P
Is used for gripping the workpieces W1 and W2 and grinding the workpieces W1 and W2.
It is used to fix the axial direction of W2. The arm provided with the plurality of claws P is movable in an upward direction, a downward direction, a forward direction, and a backward direction, whereby the workpieces W1 and W2 gripped by the plurality of claws P can be moved. It can be taken in and out between the grinding wheels 11, 12 and the adjusting wheels 21, 22 (see FIG. 2).

Also, the centerless grinding machine C1 of the first embodiment
Then, supply chutes 31 and 32 and discharge chutes 41 and 4
2 is provided. The supply chute 31 and the discharge chute 41 are for the workpiece W1, and the supply chute 32 and the discharge chute 42 are for the workpiece W2.

Here, the centerless grinding machine C of the first embodiment
A procedure for simultaneously performing in-feed grinding of workpieces W1 and W2 having different diameters will be described with reference to FIG. First, as shown in FIG. 1, the workpieces W1, W2 are set on the supply chutes 31, 32, and the grinding wheels 11, 12 and the adjusting wheel 2 are set.
The space between the workpieces 1 and 22 is larger than the diameter of the workpieces W1 and W2.

After the workpieces W1 and W2 are gripped by the plurality of claws P, the transport positioning device T1 holds the plurality of claws P while maintaining the state where the workpieces W1 and W2 are gripped by the plurality of claws P. The arm provided with is moved upward, forward, and downward to reach the state shown in FIG. After that, the gripping of the workpieces W1 and W2 by the plurality of claws P is released, and the arm provided with the plurality of claws P is moved upward, backward, and downward to obtain the state shown in FIG. As a result, the workpiece W1 is placed between the grinding wheel 11 for rough grinding and the adjustment wheel 21 and the grinding wheel 12 for finish grinding and the adjustment wheel 2
2, the workpieces W2 are respectively arranged. Therefore,
The two workpieces W1 and W2 are placed on the holding blade B. In the state shown in FIG. 4, since the workpieces W1 and W2 are not gripped by the plurality of claws P, the two workpieces W1 and W2 placed on the holding blade B can rotate. It is in.

Thereafter, the adjusting wheels 21 and 22 and the holding blade B move on the bed, and as shown in FIG.
When the gap between the wheels 1 and 12 and the adjusting wheels 21 and 22 is closed and the relative cutting feed is performed, the rotating grinding wheel 11,
Due to the contact (grinding force) with the workpiece 12, the workpieces W1 and W2 mounted on the holding blade B rotate. On the other hand, contact (frictional force) between the holding blade B and the rotating adjusting wheels 21 and 22
Accordingly, the rotational motion of each of the workpieces W1 and W2 is braked.
As a result, the workpiece W1 rotates at approximately the same speed as the peripheral speed of the adjusting wheel 21, and the workpiece W2 rotates at approximately the same speed as the peripheral speed of the adjusting wheel 22.

At this time, each of the workpieces W1 and W2 tends to move in the axial direction by the thrust generated by the rotational movement. However, the thrusts of the respective workpieces W1 and W2 are received by the plurality of claws P of the transport positioning device T1, whereby the axial position of the workpiece W1 is located between the grinding wheel 11 for rough grinding and the adjusting wheel 21. But grinding wheel 1 for finish grinding
The axial position of the workpiece W2 is fixed between the adjustment wheel 2 and the adjustment wheel 22. Therefore, the workpiece W1 is the grinding wheel 11
The workpiece W2 is located on the grinding wheel 12 relative to the adjustment wheel 21.
And the adjusting wheel 22 is rotated in a state of contact without moving in the axial direction.

As described above, the workpiece W1 is the grinding wheel 11
Thus, the workpiece W2 is simultaneously ground by the grinding wheel 12. At this time, since the types of the grinding wheels, the dressing conditions, and the truing conditions are different in each of the grinding wheels 11, 12, the two workpieces W1, W2 that are simultaneously ground by the respective grinding wheels 11, 12 have different grinding forces. Grinded to a finished surface. That is, the workpiece W1 is ground on the rough-finished surface and the workpiece W2 is ground on the finish-ground surface. Then, when the cut feed reaches a predetermined amount and is stopped, and the subsequent spark-out grinding is completed, as shown in FIG. 4, the grinding wheels 11, 12 and the adjusting wheels 21, 22 are formed.
Between the workpieces W1 and W2.

Then, the transfer positioning device T1 includes two workpieces W1 (one ground by the grinding wheel 11 and one supplied by the supply chute 31) and a plurality of two workpieces W with the plurality of claws P.
2 (the one ground by the grinding wheel 12 and the one of the supply chute 32), and then each workpiece W
1. While maintaining the state of holding W2, a plurality of claws P
The arm provided with is moved upward, forward, and downward. Thereafter, when the gripping of the workpieces W1 and W2 by the plurality of claws P is released, the workpiece W1 ground by the grinding wheel 11 for rough grinding is discharged as shown in FIG.
Therefore, the workpiece W2 ground by the grinding wheel 12 for finish grinding can be taken out from the discharge chute 42. Thereby, two workpieces W1 and W2 can be simultaneously subjected to infeed grinding on different ground surfaces.

The distance H between the grinding wheel 11 for rough grinding and the adjustment wheel 21 and the distance H between the grinding wheel 12 for finish grinding and the adjustment wheel 22 are different from each other. Each workpiece W1, W that has been subjected to infeed grinding
No. 2 also differs in their grinding finish dimensions.

Further, when the arm provided with the plurality of claws P is moved upward, backward, and downward to return to the state shown in FIG. 4, the grinding wheel 11 for rough grinding is used. Since the workpiece W1 is disposed between the adjustment wheel 21 and the grinding wheel 12 for finish grinding and the workpiece W2 is disposed between the adjustment wheel 22 again, the above-described procedure may be continuously repeated. it can.

Next, a centerless grinding machine according to a second embodiment will be described. FIG. 7 is a basic configuration diagram of a centerless grinding machine C2 according to the second embodiment. The centerless grinding machine C2 according to the second embodiment realizes predetermined grinding processes simultaneously by infeed grinding two workpieces W1 at the same time. However, the basic configuration of the centerless grinding machine C2 of the second embodiment is the same as that of the centerless grinding machine C1 of the above-described first embodiment except for the following points. That is, in the centerless grinding machine C2 of the second embodiment, the types of the grinding wheels of each of the grinding wheels 11, 12 and the dressing conditions, truing, so that the rough grinding process and the finish grinding process of the predetermined grinding process can be realized. Conditions have been determined.
Further, only the supply chute 31 and the discharge chute 41 for the workpiece W1 are provided. In addition,
The arm of the transport device T2 is short.

Here, the centerless grinding machine C of the second embodiment
In step 2, a description will be given of a procedure for simultaneously realizing each of the predetermined grinding processes by infeed grinding two workpieces W1 at the same time. However, since most of the basic operations are the same as those of the centerless grinding machine C1 of the above-described first embodiment, some of the common operations are omitted for the sake of simplicity. First, as shown in FIG. 7, the workpiece W1 is set on the supply chute 31, and the space between the grinding wheel 11 and the adjusting wheel 21 is made larger than the diameter of the workpiece W1.

Then, the transport positioning device T2 grips one workpiece W1 with the plurality of claws P, and then holds the workpiece W1 with the plurality of claws P.
The arm provided with the plurality of claws P is moved upward, forward, and downward while maintaining the state in which the individual workpieces W1 are gripped. Thereafter, the gripping of one workpiece W1 by the plurality of claws P is released, and the arm provided with the plurality of claws P is moved upward, backward, and downward to return to the state shown in FIG. . Thereby, the workpiece W <b> 1 is arranged between the grinding wheel 11 for rough grinding and the adjustment wheel 21.

Thereafter, the adjusting wheels 21 and 22 and the holding blade B move on the bed, and the grinding wheels 11 and 12 and the adjusting wheel 2
The workpiece W1 is ground by the grinding wheel 11 to the finished surface of the rough grinding by closing between the areas 1 and 22 and performing the relative cutting and feeding. Then, when the cutting feed reaches a predetermined amount and is stopped, and the subsequent spark-out grinding is completed, the workpiece W is moved between the grinding wheel 11 and the adjusting wheel 21.
Open larger than 1 diameter. Here, it is assumed that the diameter of the workpiece W1 ground on the finished surface of the rough grinding by the grinding wheel 11 is the same as the workpiece W2 described in the description of the centerless grinding machine C1 of the first embodiment. Therefore, at this time, the diameter between the grinding wheel 12 for finish grinding and the adjustment wheel 22 is larger than the diameter of the workpiece W1 that has been ground on the finished surface of the rough grinding by the grinding wheel 11.

Then, the transport positioning device T2 uses the plurality of claws P to move the two workpieces W1 (the workpiece W1 ground to the finished surface of the rough grinding by the grinding wheel 11 and the workpiece W1 of the supply chute 31). Then, while holding the state in which the two workpieces W1 are gripped by the plurality of claws P, the arm provided with the plurality of claws P is moved upward, forward, and downward. Thereafter, the gripping of the two workpieces W1 by the plurality of claws P is released, and the arm provided with the plurality of claws P is moved upward, backward, and downward to return to the state shown in FIG. . Thus, the workpiece W1 (from the supply chute 31) is located between the grinding wheel 11 for rough grinding and the adjusting wheel 21 and the workpiece W1 (from the grinding wheel 12 for finishing grinding and the adjusting wheel 22). Are ground on the finished surface of the rough grinding by the grinding wheel 11.

Thereafter, the adjusting wheels 21 and 22 and the holding blade B move on the bed, and the grinding wheels 11 and 12 and the adjusting wheel 2
When the gap between the first and the second 22 is closed and the relative infeed is performed, the workpiece W1 (from the supply chute 31) is ground by the grinding wheel 11, and the workpiece W1 (the rough grinding is finished by the grinding wheel 11). Surface) is a grinding wheel 12
At the same time, infeed grinding is performed. At this time,
The workpiece W1 ground by the grinding wheel 11 is ground to a finished surface of rough grinding, and the workpiece W1 ground by the grinding wheel 12 is ground to a finished surface of finish grinding. Then, when the cut feed reaches a predetermined amount and is stopped, and the subsequent spark-out grinding is completed, the gap between the grinding wheels 11 and 12 and the adjustment wheels 21 and 22 is made larger than the diameter of the workpiece W1.

Then, the transport positioning device T2 is provided with three workpieces W1 (a plurality of workpieces W1 ground by the grinding wheel 11, a workpiece ground by the grinding wheel 12, ), The plurality of claws P are held while maintaining the state where the three workpieces W1 are gripped by the plurality of claws P.
The arm provided with is moved upward, forward, and downward. Thereafter, when the gripping of the three workpieces W1 by the plurality of claws P is released, the workpiece W1 ground by the grinding wheel 12 can be taken out from the discharge chute 41. Workpiece W1 taken out from discharge chute 41
Is roughly ground by the grinding wheel 11 and then the grinding wheel 1
2 is finished and ground by a predetermined grinding process.

Further, when the arm provided with the plurality of claws P is moved upward, backward, and downward to return to the state shown in FIG. 7, the grinding wheel 11 for rough grinding is used. The workpiece W1 (from the supply chute 31) is located between the grinding wheel 12 for finishing and the adjusting wheel 22 between the workpiece W1 (from the supply chute 31) and the finished surface of the rough grinding by the grinding wheel 11. Ground ones) are re-arranged,
The above procedure can be repeated continuously.

The simultaneous realization of the respective steps of the predetermined grinding by simultaneously performing infeed grinding of the two workpieces W1 is equivalent to the third configuration shown in FIG.
It can also be performed by the centerless grinding machine C3 of the embodiment.
The basic configuration of the centerless grinding machine C3 of the third embodiment is as follows.
Compared to the centerless grinding machine C2 of the second embodiment described above,
It is the same except as described below. That is, in the centerless grinding machine C3 of the third embodiment, the grinding wheels 11, 1
By incorporating the first gear mechanism G1 provided between the two, the grinding wheels 11, 12 are adjacent to each other, and a step 19 is provided in the adjacent portion. Similarly, by incorporating the second gear mechanism G2 provided between the adjustment wheels 21 and 22, the adjustment wheels 21 and 22 are provided.
They are adjacent to each other, and a step 29 is provided in such an adjacent portion. Further, the arm of the transport device T3 is shortened accordingly.

However, the centerless grinding machine C3 of the third embodiment
The procedure for simultaneously realizing each of the predetermined grinding steps by infeed grinding the two workpieces W1 at the same time is the same as that of the centerless grinding machine C2 of the second embodiment, and a description thereof will be omitted. The step 19 provided in the portion adjacent to the grinding wheels 11 and 12 and the step 29 provided in the portion adjacent to the adjustment wheels 21 and 22 are ground by the grinding wheel 11 for rough grinding. It can also be used as positioning means for fixing the position of the workpiece W1 in the axial direction.

That is, the centerless grinding machine C of the present embodiment
In 1, C2 and C3, the grinding wheel 1 in an opposing positional relationship
In addition to 2 and the adjustment wheel 22, another grinding wheel 11 having a different type of grinding wheel, dressing condition or truing condition is newly provided, and another adjustment is performed at a position facing the other grinding wheel 11. A wheel 21 is newly provided, and the transport positioning devices T1, T2, T are provided between the grinding wheels 11, 12 and the adjusting wheels 21, 22 which are in opposition to each other.
3 disposes each of the workpieces W1, W2 on the holding blade B1, and carries and positions the transport positioning devices T1, T2, T2 between the grinding wheels 11, 12 and the adjusting wheels 21, 22 in the opposed positional relationship.
T3 fixes the positions of the workpieces W1, W2 in the axial direction, so that each of the grinding wheels 1 differs in any one of the types of the grinding wheels, the dressing conditions and the truing conditions.
Since the individual workpieces W1 and W2 are simultaneously ground in the steps 1 and 12, the two workpieces W1 and W2 can be simultaneously in-feed ground to different ground surfaces.

Further, the grinding wheel 1 in the facing positional relationship
Since each interval H between 1, 12 and the adjusting wheels 21, 22 is different,
For each of the workpieces W1, W2 that have been infeed-ground to different ground surfaces simultaneously, their ground dimensions can also be different.

Further, the first gear mechanism G1 is connected to each grinding wheel 1
1 and 12, the grinding wheel 12
The peripheral speed of the other grinding wheel 11 can be adjusted by the rotation control of the first wheel mechanism G1 and the gear ratio of the first gear mechanism G1, so that the grinding speed can be controlled for each of the grinding wheels 11, 12, and , The second gear mechanism G2 is adjusted to each of the adjusting wheels 21 and 22.
Since the peripheral speeds of the other adjustment wheels 21 can be adjusted by controlling the rotation of the adjustment wheel 22 and the gear ratio of the second gear mechanism G2 by providing them between each other, the peripheral speed of each of the workpieces W1, W2 can be reduced. It is possible to control each of the workpieces W1 and W2, and therefore, the grinding wheels 11, 12 which are in opposition to each other.
The grinding speed and the peripheral speed of the workpiece W1 or W2 are set to an optimal relationship within a predetermined ratio range in accordance with the grinding conditions (for example, workpiece material, surface roughness, etc.) for each of the wheel and the adjustment wheels 21 and 22. be able to.

Further, by providing the first gear mechanism G1 between each of the grinding wheels 11, 12, each of the grinding wheels 11, 12 is independently rotatably supported. By providing the mechanism G2 between the adjusting wheels 21 and 22, the adjusting wheels 21 and 22 are independently rotated and supported. Therefore, the grinding wheels 11 and 12 and the adjusting wheels 11 and 12 which are opposed to each other. Between 21 and 22, the structure of the rotation support (for example, a two-sided structure,
By selecting a cantilevered structure, etc.)
It is possible to set the rigidity of the adjustment wheels 1 and 12 and the adjustment wheels 21 and 22. For example, since the grinding wheel 11 performs rough grinding, it is not necessary to secure large rigidity between the grinding wheel 11 and the adjusting wheel 21. Therefore, the support structure of the grinding wheel 11 and the adjusting wheel 21 may be a cantilever structure. . However, grinding wheel 1
2 performs finish grinding, the grinding wheel 12 and the adjusting wheel 2
It is necessary to secure a large rigidity of the grinding wheel 1
The support structure for the wheel 2 and the adjusting wheel 22 is a double-supported structure.

The grinding wheels 11, 12 and the adjusting wheel 21,
In the case where the grinding wheels 22 are independently supported by rotation, the grinding wheels 1 and 12 and the adjustment wheels 21 and 22 are respectively attached to one rotating shaft.
The rigidity of the adjustment wheels 1 and 12 and the adjustment wheels 21 and 22 is large.

Further, in the centerless grinding machines C2 and C3 of the second and third embodiments, two workpieces W1 which have been simultaneously subjected to infeed grinding are subjected to a rough grinding process of a predetermined grinding process and a finishing process. Since the grinding finish dimensions and the grinding finish surface of the grinding process are realized, each process of the predetermined grinding process is performed by 1
The infeed grinding can be performed by the centerless grinding machines C2 and C3.

Further, in the centerless grinding machines C2 and C3 of the second and third embodiments, the transfer positioning device T
The workpieces W1 are taken in and out in an order based on a predetermined grinding process at T2 and T3.
Since the grinding finish dimensions and the grinding finish surface of the workpiece W1 discharged from the discharge chute 41 in step 3 are all the same (one ground by a predetermined grinding process), the center of the through feed grinding described in the section of the prior art is used. The effect of a grinding machine (that is, a series of machining from rough finishing to super-raising can be performed quickly and reliably without the troublesome work of replacing a grinding wheel) It can also be realized in the grinding machines C2 and C3.

Further, the centerless grinding machine C1 of this embodiment,
In C2 and C3, two grinding wheels 11, 12 are fixedly mounted on a bed, and two adjusting wheels 21, 22 and a holding blade B move integrally on the bed, further,
Since all the workpieces W1, W2 whose axial positions are fixed by the transport positioning devices T1, T2, T3 are simultaneously subjected to infeed grinding, the grinding precision of each workpiece W1, W2 which is simultaneously infeed ground is: The workpieces W1, W2 fixed at predetermined axial positions by the transport positioning devices T1, T2, T3 are simultaneously subjected to infeed grinding by a sizing device (not shown) for ensuring the grinding accuracy. It is possible to secure the grinding accuracy of all the other workpieces W1 and W2 to be simultaneously in-feed ground by one sizing device. it can.

The present invention is not limited to the above embodiment, and various changes can be made without departing from the gist of the present invention. For example, the centerless grinding machine C of the present embodiment
In 1, C2 and C3, the grinding wheel 1 in an opposing positional relationship
Although the two wheels 1 and 12 and the two adjusting wheels 21 and 22 are provided, three or more grinding wheels and adjusting wheels having a facing positional relationship may be provided.

In this case, simultaneous infeed grinding of a plurality of workpieces W1 and W2 to different grinding finish dimensions means that:
3 or more workpieces W1, which are simultaneously in-feed ground,
Of the workpieces W2, some of the workpieces W1 and W2 may have different grinding finish dimensions. Similarly, a plurality of workpieces W1, W
Simultaneously performing infeed grinding of different workpieces 2 on different ground surfaces may mean a case where, among three or more workpieces W1 and W2 that are simultaneously infeed ground, some workpieces W1 and W2 have different ground surfaces.

Further, that one of the types of the grinding wheels, the dressing conditions and the truing conditions is different in each grinding wheel, means that the type of the grinding wheels in some of the three or more grinding wheels is different. , Dressing conditions or truing conditions may be different. Similarly, different intervals between the grinding wheel and the adjusting wheel in the opposing positional relationship are different even when some of the intervals among the three or more intervals between the grinding wheel and the adjusting wheel in the opposing positional relationship are different. Good.

The centerless grinding machine C3 of the third embodiment
In the above, the grinding wheels 11 and 12 are adjacent to each other, so that a step 19 is provided in such an adjacent portion. Similarly, when the adjustment wheels 21 and 22 are adjacent to each other, a step 29 is provided in the adjacent portion. However, the centerless grinding machine C3 shown in FIG.
1 and 12 may be the case where two steps 21 and 22 are formed at positions facing each other in one adjustment wheel.

Even in such a case, if the grinding wheels 11 and 12 are replaced with the steps 11 and 12 of the grinding wheel, and the adjusting wheels 21 and 22 are replaced with the steps 21 and 22 of the adjusting wheel, respectively, the two workpieces W1 can be replaced. By infeed grinding at the same time,
The procedure for simultaneously realizing each of the predetermined grinding processes is described in the second section.
It is the same as the centerless grinding machine C2 of the embodiment. Since there is only one grinding wheel and one adjusting wheel, the first gear mechanism G1 and the second gear mechanism G2 are not provided. In addition, a step 19 provided in a portion adjacent to the steps 11 and 12 of the grinding wheel and a step 29 provided in a portion adjacent to the steps 21 and 22 of the adjusting wheel are the same as those of the grinding wheel for rough grinding. It can be used as positioning means for fixing the position of the workpiece W1 to be ground in the step 11 in the axial direction.

In other words, in such a case, the steps 11 and 12 of the grinding wheel and the steps 21 and 2 of
The transfer positioning device T3 arranges each workpiece W1 on the holding blade B every two intervals, and transfers the workpiece W1 between the steps 11 and 12 of the grinding wheel and the steps 21 and 22 of the adjusting wheel, which are in an opposing positional relationship. The positioning device T3 fixes the position of each workpiece W1 in the axial direction, so that each step 11 of the grinding wheel has a different distance H from the steps 21 and 22 of the adjustment wheels in the opposed positional relationship.
At 12, individual workpieces W1 can be ground simultaneously, so that two workpieces W1 can be simultaneously in-feed ground to different grinding finish dimensions.

Further, any one of the grinding wheel type, dressing condition and truing condition is different in each of the stages 11 and 12 of the grinding wheel, so that each workpiece W1 which has been in-feed ground to different grinding finish dimensions at the same time. On the other hand,
Their ground surfaces can also be different.

In addition, the centerless grinding machines C1, C2, and C3 of the present embodiment, including the case described above, use the grinding wheel 1
Although the wheels 1 and 12 and the adjusting wheels 21 and 22 have the same structure, if the in-feed grinding of the workpieces W1 and W2 can be performed simultaneously, the grinding wheels 11 and 12 and the adjusting wheels 2
1, 22 need not have the same structure. For example, the first gear mechanism G1
The adjustment wheels 21 and 22 may be adjacent to each other and the second gear mechanism G2 may be built in.
Further, a structure in which two steps 11, 12 are provided in one grinding wheel, while a structure in which two adjustment wheels 21, 22 are provided may be employed.

Further, even when no thrust is generated in the rotating workpieces W1, W2, the transport positioning devices T1, T2, T
The positioning function of No. 3 ensures that the positions of the workpieces W1 and W2 in the axial direction are fixed, so that it is possible to contribute to improvement of grinding accuracy and safety.

[0079]

According to the centerless grinding machine of the present invention, when a plurality of steps are formed at opposing positions of the grinding wheel and the adjusting wheel, respectively, the step of the grinding wheel and the adjusting wheel which are opposed to each other are formed. The transfer means arranges each work piece on the holding blade for each of the steps, and the positioning means sets the axial direction of each work piece for each of the steps of the grinding wheel and the adjustment wheel in the opposed positional relationship. By fixing the position of the wheel, it is possible to simultaneously grind individual workpieces at each stage of the grinding wheel having a different distance from the stage of the adjusting wheel in an opposing positional relationship. Infeed grinding can be performed simultaneously to different grinding finish dimensions.

Further, if any one of the grinding wheel type, dressing condition and truing condition is different in each stage of the grinding wheel, each workpiece which has been in-feed ground to different grinding finish dimensions at the same time can be used. , Their ground finish can also be different.

Further, another grinding wheel having a different kind of grinding wheel, dressing condition or truing condition is newly provided, and another adjusting wheel is newly provided at a position facing the other grinding wheel. In the case, the transport means arranges each work piece on the holding blade between the grinding wheel and the adjusting wheel in the opposing positional relationship, and also sets each workpiece between the grinding wheel and the adjusting wheel in the opposing positional relationship. Positioning means fixes the axial position of each workpiece, so that individual workpieces can be simultaneously ground on each grinding wheel with one of the different types of grinding wheels, dressing conditions or truing conditions. Therefore, a plurality of workpieces can be simultaneously subjected to infeed grinding on different ground surfaces.

Further, if the distance between the grinding wheel and the adjusting wheel in the opposite positional relationship is different, each workpiece which has been infeed-ground simultaneously on different ground surfaces can be used.
Their grinding finish dimensions can also be different.

By providing the first gear mechanism between the respective grinding wheels, the peripheral speed of the other grinding wheels can be adjusted by controlling the rotation of the grinding wheel and the gear ratio of the first gear mechanism. Therefore, the grinding speed can be controlled for each grinding wheel, and by providing the second gear mechanism between the adjusting wheels, the rotation control of the adjusting wheel and the second speed can be controlled.
Since the peripheral speed of the other adjusting wheels can be adjusted by the gear ratio of the gear mechanism, the peripheral speed of each workpiece can be controlled for each workpiece, and therefore, the grinding wheel wheels that are opposed to each other are in a positional relationship. The grinding speed and the peripheral speed of the workpiece can be set to an optimal relationship within a predetermined ratio range in accordance with the grinding conditions (for example, workpiece material, surface roughness, etc.) for each of the wheel and the adjustment wheel.

Further, by providing the first gear mechanism between the respective grinding wheels, the respective grinding wheels are independently supported for rotation, and the second gear mechanism is connected to the respective adjusting wheels. Since the adjustment wheels are separately supported by being provided between the grinding wheels, the grinding conditions (for example, rough grinding,
In accordance with the finish grinding, etc.), the structure of the rotation support (for example,
Double-sided, cantilevered, etc.)
It becomes possible to set the rigidity of the grinding wheel and the adjusting wheel.

If each of the workpieces that have been subjected to the in-feed grinding at the same time realize the finished dimensions and the finished surface of the respective steps of the predetermined grinding, the respective steps of the predetermined grinding are performed in one step. It can be performed with a centerless grinding machine for in-feed grinding.

Further, if the workpieces are taken in and out in the order based on the predetermined grinding process by the transport means,
Since the grinding finish dimensions and the finished surface of the workpiece discharged from the centerless grinding machine of the present invention by the conveying means are all the same, the effect of the centerless grinding machine of through feed grinding described in the section of the prior art (ie, , A series of processes from rough finishing to super-raising can be performed quickly and reliably without the troublesome work of replacing the grinding wheel) even in the centerless grinding machine for in-feed grinding. Can be.

Further, since all the workpieces whose axial positions are fixed by the positioning means are simultaneously subjected to in-feed grinding, the grinding accuracy of each workpiece which is simultaneously subjected to in-feed grinding has relevance. With a sizing device that ensures the grinding accuracy of the workpiece fixed at the predetermined axial position by the positioning means, it is possible to simultaneously secure the grinding accuracy of other workpieces that are infeed-ground simultaneously, The grinding accuracy of all the workpieces to be subjected to infeed grinding can be ensured by one sizing device.

[Brief description of the drawings]

FIG. 1 is a basic configuration diagram of a centerless grinding machine of a first embodiment, showing a state when preparation for in-feed grinding is completed.

FIG. 2 is a diagram showing the principle of in-feed grinding performed by the centerless grinding machine of the first embodiment.

FIG. 3 is a basic configuration diagram of the centerless grinding machine of the first embodiment, and shows a state when a workpiece is supplied for the first time;

FIG. 4 is a basic configuration diagram of the centerless grinding machine of the first embodiment, showing a state before starting infeed grinding or after finishing infeed grinding.

FIG. 5 is a basic configuration diagram of the centerless grinding machine of the first embodiment and shows a state during in-feed grinding.

FIG. 6 is a basic configuration diagram of the centerless grinding machine of the first embodiment, showing a state in which the workpiece is discharged and the workpiece is supplied at the same time.

FIG. 7 is a basic configuration diagram of a centerless grinding machine according to a second embodiment.

FIG. 8 is a basic configuration diagram of a centerless grinding machine according to a third embodiment.

[Explanation of symbols]

 C1 to C3 Centerless grinding machine 11, 12 Grinding wheel 21, 22 Adjustment wheel B Holding blade G1 First gear mechanism G2 Second gear mechanism H Distance between grinding wheel and adjustment wheel T1 to T3 Transfer positioning device W1, W2 object

Claims (8)

[Claims] A grinding wheel having a peripheral speed controlled to a grinding speed; a grinding wheel provided to face the grinding wheel, and rotationally controlled to a peripheral speed within a predetermined ratio range with respect to a peripheral speed of the grinding wheel. An adjusting wheel, a holding blade provided between the grinding wheel and the adjusting wheel, conveying means for taking in and out the workpiece between the grinding wheel and the adjusting wheel, the grinding wheel and Positioning means for fixing the position of the workpiece in the axial direction between the adjusting wheels, and rotating the workpiece placed on the holding blade by the conveying means with the grinding force of the grinding wheel. A centerless grinding machine that performs infeed grinding of the cylindrical surface of the workpiece by receiving the thrust generated in the workpiece by the positioning means while braking with the friction force of the adjusting wheel and the holding blade, And the friction A plurality of steps are respectively formed at opposing positions of the grinding wheel, and the transfer means arranges each workpiece on the holding blade between each of the steps of the grinding wheel and the step of the adjusting wheel in the opposing positional relationship. In addition, the positioning means fixes the position of each workpiece in the axial direction between each step of the grinding wheel and the step of the adjustment wheel which are in opposing positional relation, so that a plurality of workpieces are subjected to different grinding finishes. A centerless grinding machine characterized by simultaneous infeed grinding to dimensions. 2. The centerless grinding machine according to claim 1, wherein at least one of the type of the grinding wheel, the dressing condition and the truing condition is different at each stage of the grinding wheel, so that the in-feed grinding is performed simultaneously. A centerless grinding machine characterized in that each workpiece has a different grinding finish surface. 3. A grinding wheel whose peripheral speed is rotationally controlled to a grinding speed; and a grinding wheel provided to face the grinding wheel and rotationally controlled to a peripheral speed within a predetermined ratio with the peripheral speed of the grinding wheel. An adjusting wheel, a holding blade provided between the grinding wheel and the adjusting wheel, conveying means for taking in and out the workpiece between the grinding wheel and the adjusting wheel, the grinding wheel and Positioning means for fixing the position of the workpiece in the axial direction between the adjusting wheels, and rotating the workpiece placed on the holding blade by the conveying means with the grinding force of the grinding wheel. A centerless grinding machine that performs infeed grinding of the cylindrical surface of the workpiece by receiving the thrust generated in the workpiece by the positioning means while braking with the friction force of the adjusting wheel and the holding blade, Grinding against Another grinding wheel having one of different types of stones, dressing conditions or truing conditions, and another adjusting wheel provided to face the other grinding wheel, and the grinding wheels in an opposed positional relationship. The transport means arranges each workpiece on the holding blade every time between the adjusting wheel and the adjusting wheel, and the positioning means moves in the axial direction of each workpiece between the grinding wheel and the adjusting wheel which are in opposition to each other. A centerless grinding machine characterized in that a plurality of workpieces are simultaneously subjected to infeed grinding on different ground surfaces by fixing positions. 4. The centerless grinding machine according to claim 3, wherein the distance between the grinding wheel and the adjusting wheel in the opposite positional relationship is different, so that the finished size of the workpieces simultaneously infeed-ground is reduced. A centerless grinding machine characterized by different features. 5. The centerless grinding machine according to claim 3, wherein a first gear mechanism provided between the grinding wheels and a second gear mechanism provided between the adjustment wheels. A gear mechanism, wherein the peripheral speed of another grinding wheel is adjusted by controlling the rotation of the grinding wheel and the gear ratio of the first gear mechanism, and controlling the rotation of the adjusting wheel and the gear of the second gear mechanism. A centerless grinding machine characterized by adjusting the peripheral speed of another adjusting wheel according to the ratio. 6. The centerless grinding machine according to any one of claims 1 to 5, wherein each of the workpieces simultaneously in-feed-ground is ground and finished in a predetermined grinding process. A centerless grinding machine characterized by having a finished surface. 7. The centerless grinding machine according to claim 6, wherein the transfer means takes in and out the workpiece in an order based on the grinding process. 8. The centering machine according to claim 1, wherein the positioning means secures a grinding accuracy of a workpiece fixed at a predetermined axial position. A centerless grinding machine, wherein the sizing device also ensures the grinding accuracy of other workpieces that are simultaneously subjected to infeed grinding.