JPS6384873A - Multi-spindle rotary dresser device - Google Patents

Abstract

PURPOSE:To eliminate uneven wear and damage further the generation of disorder, by providing plural rotary dressers to be arranged spacing a predetermined distance and setting peripheral surface grinding wheel sides of the dressers so as to form almost the same projection figure to the peripheral surface shape of a grinding wheel so that plural abrasive surfaces are corrected by one time operation. CONSTITUTION:A device, which provides rotary dressers 5a, 5b successively spacing a predetermined distance to be arranged in a direction of the peripheral tangent A of a grinding wheel 10, sets a peripheral surface grinding wheel side, when it is projected in the direction of the tangent A, of these dressers so as to form almost the same shape to the peripheral surface shape of the grinding wheel 10. And the device, if the grinding wheel 10 is moved as shown by an arrow head B in the drawing, first corrects one abrasive surface 10b by the rotary dresser 5b next the other abrasive surface by the dresser 5a. Accordingly, the device enables the plural abrasive surfaces of the grinding wheel 10 to be corrected by one time operation while prevents the rotary dressers 5a, 5b from unevenly wearing, and damage in the peripheral surface and the generation of disorder can be eliminated by exchanging or correcting only the dressers 5a, 5b.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a rotary dresser device that includes a plurality of rotary dressers that divides and corrects the profile of the outer peripheral surface of a grindstone.

[Prior Art] ° For example, in the grinding process of a material to be ground having a V-groove, such as a groove-type long slide, it is necessary to Traverse grinding or plunge grinding is performed using a grindstone having an outer circumferential surface of a square shape corresponding to the V-groove. The method for modifying the outer peripheral surface of the whetstone used at this time is as follows:
Generally speaking, a single diamond is used to modify the abrasive surfaces that make up the outer circumferential surface of the whetstone, one side at a time, and a rotary dresser whose outer circumferential surface has a V-groove shape similar to the material to be ground is used to repair a pair of abrasive wheels. A method of simultaneously modifying the surfaces is adopted.

[Problems to be Solved by the Invention] However, in the former method, each abrasive surface making up the outer peripheral surface of the whetstone must be corrected, so a dressing process is required multiple times for each abrasive surface. There is a problem that it becomes difficult to carry out the process from correcting the whetstone to grinding the material to be ground using the whetstone in a continuous process.
``The latter method does not have this problem, but if a certain amount of diamond abrasive grains are attached to the outer peripheral surface of the rotary dresser per unit area, the V of this outer peripheral surface
Since there is a difference equal to the depth of the V-groove between the radius on the groove bottom side and the radius on the V-groove opening edge side, the number of diamond abrasive grains attached to the entire circumference of the outer circumferential surface is This means that the wear on the V-groove bottom side is greater than the wear on the edge side of the V-groove opening, and the wear on the V-groove opening edge is greater when the rotary dresser is rotated. The circumferential speed on the V-groove bottom side is smaller than the circumferential speed on the edge side, and from this point of view, the V
Wear increases on the bottom side of the groove, resulting in V on the outer circumferential surface.
There was a problem in that there was a large difference in the degree of wear between the groove opening edge side and the V-groove bottom side, which significantly affected the grinding performance. Generally speaking, in the latter method, if one of the outer circumferential surfaces of the rotary dresser is damaged or the waviness accuracy is disturbed, the entire rotary dresser will be damaged even if the other outer circumferential surface is normal. In addition to being uneconomical due to the need for replacement or correction, if it is necessary to add crowning to the grinding surface of the grinding wheel, a special rotary dresser must be prepared with a shape that corresponds to the amount of crowning. However, there is also the problem that the cost of the rotary dresser increases.

Therefore, an object of the present invention is to be able to correct a plurality of grinding surfaces constituting the outer peripheral surface of a grindstone in a single operation, and to
We have developed a rotary dresser device that can solve the problem of uneven wear, the problem of replacement or correction when the outer peripheral surface of a rotary dresser is damaged or distorted, and the problem of adding crowning to the grinding surface of a whetstone. It is about providing.

[Means for Solving the Problems] That is, the present invention is a rotary dresser device for modifying the outer peripheral surface of a grindstone composed of a plurality of grinding surfaces,
A plurality of rotary dressers for modifying each grinding surface on the outer circumferential surface of the grinding wheel are sequentially arranged at a predetermined interval from each other along the tangential direction of the outer circumference of the grinding wheel, and the outer circumferential surface of each rotary dresser on the grinding wheel side is oriented in the tangential direction of the outer circumference of the grinding wheel. This is a multi-axis rotary dresser device installed so that a projected view having substantially the same shape as the outer peripheral surface of the grindstone is formed when projected along the grindstone.

The grindstone to which the multi-axis rotary dresser device of the present invention is applied has an outer peripheral surface composed of a plurality of grinding surfaces, and the outer peripheral surface is composed of two grinding surfaces and protrudes in a V-shape. The shape may be a trapezoidal protruding shape composed of three abrasive surfaces, or a protruding shape having four or more abrasive surfaces.

Further, the rotary dresser used in the rotary dresser device of the present invention may have an outer circumferential surface larger than the width dimension of each grinding surface of the above-mentioned grindstone, and can be brought into contact with the entire width of the grinding surface. The shape may be, for example, cylindrical, disk-shaped, conical, etc., and has a drive shaft at the center of rotation.

Roughly speaking, the arrangement of the plurality of rotary dressers that correct each grinding surface on the outer peripheral surface of the grinding wheel is basically arranged sequentially along the tangential direction of the outer circumference of the grinding wheel (i.e., the direction of movement of the grinding wheel relative to the rotary dresser). They are located at a predetermined interval from each other and are installed so that when the outer circumferential surface of each rotary dresser on the grinding wheel side is projected along the tangential direction of the outer circumferential surface of the grinding wheel, a projected view having substantially the same shape as the outer circumferential surface of the grinding wheel is formed. In order to finish each grinding surface of the grinding wheel flat, the drive shaft of each rotary dresser must have a predetermined interval in the tangential direction of the outer circumference of the grinding wheel, and be positioned within parallel planes that are orthogonal to the tangential direction of the outer circumference of the grinding wheel. Place the device as shown.

By the way, if the outer circumferential surface of the rotary dresser is brought into contact with the outer circumferential surface of the whetstone while it is slightly tilted with respect to the axis of the whetstone for correction, it is possible to impart so-called crowning, where the center of the outer circumferential surface of the whetstone is depressed. However, the degree of crowning, that is, the degree of depression on the outer circumferential surface of the grinding wheel, corresponds to the degree of inclination when the outer circumferential surface of the rotary dresser is brought into contact.

For this reason, by providing crowning means for tilting the parallel plane on which the drive shaft is located at a predetermined angle in either the left or right direction for each rotary dresser, it is possible to You can apply any amount of crowning. This crowning means may be any means as long as it can tilt the parallel plane on which the drive shaft of each rotary dresser is located at a predetermined angle in either the left or right direction. Examples of methods include providing one center of rotation, or allowing a pair of support means located on the drive axis of each rotary dresser to move within a predetermined range. With this crowning means, the center of rotation when tilting the parallel plane on which the drive shaft of each rotary dresser is located is located on a straight line passing through the center of the contact line between the outer peripheral surface of each rotary dresser and the grinding surface of the outer peripheral surface of the grinding wheel. It is preferable to do this, and thereby the crowning formed on the grinding surface of the grindstone can be made to have a bilaterally symmetrical shape. In addition, if you want to apply asymmetrical crowning to the grinding surface of the whetstone, just shift the center of rotation for tilting the rotary dresser from the width center position of the grinding surface, and the deepest crowning will be adjusted by the amount of this shift. It is possible to provide asymmetric crowning whose position is shifted from the center position.

[Function] In the multi-axis rotary dresser device of the present invention, a plurality of rotary dressers for modifying each grinding surface on the outer circumferential surface of the grinding wheel are sequentially arranged in layers at predetermined intervals along the tangential direction of the outer circumference of the grinding wheel. In addition, when the outer peripheral surface of each rotary dresser on the grinding wheel side is projected along the tangential direction of the outer circumference of the grinding wheel, a projected view having approximately the same shape as the outer peripheral surface of the grinding wheel is formed. When modifying the outer circumferential surface of a whetstone, each rotary dresser corrects each grinding surface on the outer circumferential surface of the whetstone by moving the whetstone relatively from one side to the other of each rotary dresser. As a result, the entire outer circumferential surface of the grindstone can be corrected in one operation.

Also, since each rotary dresser can be controlled individually,
Even if crowning is required for each grinding surface of a grinding wheel, it can be easily done by simply abutting the outer circumferential surface of the rotary dresser against the outer circumferential surface of the grinding wheel while slightly tilted with respect to the axis of the grinding wheel. It is possible to apply the desired amount of crowning, and by aligning the center position of the width of the abrasive surface with the rotation center for tilting the rotary dresser, the center position of the abrasive surface is the deepest of the crowning, and the crowning is symmetrical. In addition, by shifting the rotation center for tilting the rotary dresser from the width center position of the abrasive surface, it is possible to provide crowning with the deepest position of the crowning offset from the center position by that amount.

[Examples] The present invention will be specifically described below based on examples shown in the accompanying drawings.

1 and 2, a multi-spindle rotary dresser apparatus according to an embodiment of the present invention is shown. This multi-spindle rotary dresser device includes a machine base 1, a pair of holders 2a and 2b attached to this machine base 1, and each of these holders 2.
A pair of motors 3a, 3 each held by a12b
b, and drive shafts 4a, 4b of these motors 3a, 3b.
It consists of a pair of disc-shaped rotary dressers 5a and 5b each fixed at the tip of the machine base 1.
, the rotary dresser 5 is attached to a grindstone not shown in the figure.
In order to position the rotary dressers 5a and 5b, there is a turning amount adjustment device 6 that turns the rotary dresser 5a15b, and a left-right position fine adjustment device 7 that moves the rotary dressers 5a and 5b in the left and right directions within a predetermined range by operating the handle 7a. and is provided.

Furthermore, the attachment between the machine base 1 and the pair of holders 2a, 2b is achieved using reference pins provided on the extension line of the diameter passing through the center of the rotary dresser 5a, 5b fixed to each of these holders 2a, 2b. 8a18b and these reference bins 8a.

A fixing bolt 9a restricts the rotation of each holder 2a, 2b rotating around the rotation center 8b within a predetermined angle θ.

By rotating each holder 2a, 2b around the reference bin &a, 8b within a predetermined angle θ and fixing it with fixing bolts 9a, 9b, each rotary dresser 5a, 5b drive shaft 4a,
4b is located on each rotary dresser 5a.
It can be tilted within a predetermined angle θ with the diameter passing through the center of 15b as the center of rotation.

Next, an example of the operation and operating method of the multi-spindle rotary dresser device of the above embodiment will be explained with reference to the explanatory diagrams of FIGS. 3 and 4.

As shown in FIGS. 3 to 5, the multi-axis rotary dresser device of the above embodiment, which has a pair of rotary dressers 5a, 5b and motors 3a, 3b, has a grinding wheel 10 between a grinding wheel 10 and a workpiece 11. They are sequentially arranged at predetermined intervals from each other along six directions tangent to the outer periphery, and the outer circumferential surface of each rotary dresser 5a, 5b on the grindstone side corresponds to the outer periphery of the grindstone 10 when projected along the six directions tangent to the outer circumference of the grindstone. Surface shape (i.e. V-shape as shown in Figure 5)
It is installed so that a projected view having approximately the same shape as the one shown in FIG. In FIGS. 3 to 5, the grinding wheel 1G moves as shown by arrow B, and first, one of the grinding surfaces 10b constituting the outer circumferential surface of the rotary dresser 5b near the grinding wheel 10 is corrected, and then One abrasive surface 10a constituting the outer peripheral surface of the other rotary dresser 5a is corrected, and then the V-groove 11a of the material to be ground 11 is ground.

By the way, in FIG. 2, one of the rotary dressers 5a is rotated within a predetermined angle θ about its reference pin 8a and fixed with a fixing bolt 9a, whereby the outer circumference of the rotary dresser 5a and the outer circumference of the grindstone 10 When the rotary dresser 5a is tilted within a predetermined angle θ with a straight line passing through the center of the contact line between the surface and the abrasive surface 10a as the center of rotation O, the rotary dresser 5a rotates around the grinding wheel 10 as shown in FIG. 6a. When the abrasive surface 10a of the whetstone 10 is corrected in this state by coming into contact with one abrasive surface 10a at an angle θ, a crowning is formed in which the center side of the abrasive surface 10a is recessed by a depth d. The crowning ID at this time depends on the size of the inclination angle θ of the rotary dresser 5a, and by tightening the fixing position with the fixing bolt 9a and adjusting the inclination angle θ, the crowning @d can be adjusted. Further, as shown in FIG. 6, if the handle 7a of the left-right position fine adjustment device 7 is operated to shift the rotation center 0 of the tilted rotary dresser 5a from the width center position of the grinding surface 10a of the grindstone 10, this The deepest position of the crowning formed on the abrasive surface 10a is also shifted accordingly, resulting in asymmetrical crowning.

Further, FIGS. 7 to 9 show each grinding surface 10a of the grindstone 10 using the multi-axis rotary dresser device of the above embodiment.
, 10b. First, as shown in FIG. Then, as shown in FIG. 8, drive shaft 4b of one rotary dresser 5b.
After tilting the parallel plane on which is located at a predetermined angle θ, the rotary dresser 5b is brought into contact with the grinding surface 10b of the grinding wheel 10 to give crowning to the grinding surface 10b, and as shown in FIG. After tilting the parallel plane on which the drive shaft 4a of the other rotary dresser 5a is located at a predetermined angle θ, the rotary dresser 5b is moved to the grinding surface 10 of the grinding wheel 10.
a to provide crowning to this abrasive surface 10a.

It should be noted that the operation method for performing the correction of crowning each of the grinding surfaces 10a and 10b of the grinding wheel 10 is not limited to the above, and for example, each rotary dresser 5a and 5b may be tilted at a predetermined angle θ. Then, these rotary dressers 5a and 5b are attached to each grinding surface 1 of the grinding wheel 10.
These abrasive surfaces 10 are brought into contact with 0a and 10b at the same time.
Crowning can also be applied to a and 10b at the same time.

Next, FIGS. 10 and 11 show a multi-axis rotary dresser device according to a modification of the above embodiment.
The center of rotation of b is the reference pin 8a.

The position 8b is located off the extension line of the diameter passing through the center of each rotary dresser 5a, 5b.

In the case of this modification, each of the reference pins 8a,
Each rotary dresser 5a, 5b with rotation center 8b
By rotating the drive shafts 4a, 4b of each rotary dresser 5a, 5b within a range of a predetermined angle θ, the parallel plane on which the drive shafts 4a, 4b of each rotary dresser 5a, 5b are located is rotated at a predetermined angle θ with the straight line passing through the center of each rotary dresser 5a, 5b as the center of rotation. Although it can be tilted within this range, the positions of the reference pins 8a and ab are shifted from the extension line of the diameter passing through the center of each rotary dresser 5a and 5b, causing a positional shift. However, this positional deviation can be corrected by adjusting the contact position between the grinding surface 10a or 10b of the grinding wheel 10 and the rotary dresser 5a or 5b by moving the rotary dresser 5a or 5b or the grinding wheel 10 slightly. position (usually the rotary dresser 5a or 5b is directly below the grinding wheel 10)
This can be easily absorbed by employing means such as slightly shifting it in either the front or rear direction from the position where the two are placed in contact with each other.

[Effects of the Invention] According to the present invention, it is possible to correct a plurality of grinding surfaces that constitute the outer circumferential surface of the grindstone with a single operation, and the outer circumferential surface has the same shape as the material to be ground. Unlike rotary dressers, the rotary dresser does not wear unevenly, and if any damage or misalignment occurs on the outer circumferential surface of any rotary dresser, only that rotary dresser needs to be replaced or repaired. , roughly,
Desired crowning can be easily imparted to the grinding surface of a grindstone by simply tilting the parallel plane on which the drive shaft of the rotary dresser is located in either the left or right direction.

[Brief explanation of the drawing]

FIG. 1 is a front view of a multi-axis rotary dresser device according to an embodiment of the present invention, FIG. 2 is a plan view of FIG. 1, and FIGS. 3 to 5 are operations of the multi-axis rotary dresser device of the above embodiment. FIG. 6a is an explanatory diagram for applying crowning to the grinding surface of a grindstone. Explanatory diagram when attached, 7th
9 to 9 are explanatory diagrams showing an operating method when performing a correction to add crowning to the grinding surface of a grindstone, and FIGS. 10 and 11 are a front view and a plan view showing a modification of the above embodiment. Explanation of symbols (2a) (2b)... Holder, (3a) (3
b) - Motor, (4a) (4b) Drive shaft, (5a) (5b) Rotary dresser, (8a
) (8b)...Reference pin (crowning means)
, (9a) (9b)...Fixing bolt (crowning means) (10)...Whetstone, (10a)(
10b) --- Grinding surface, A... Grinding wheel outer peripheral surface line, O.
··Rotation center.

Claims (5)

[Claims] (1) A rotary dresser device for modifying the outer circumferential surface of a grindstone composed of a plurality of grinding surfaces, in which the plurality of rotary dressers for correcting each grinding surface of the outer circumference of the grindstone are sequentially installed along the tangential direction of the outer circumference of the grindstone. They are arranged at a predetermined distance from each other, and are installed so that when the outer peripheral surface of each rotary dresser on the grinding wheel side is projected along the tangential direction of the outer circumference of the grinding wheel, a projected view having approximately the same shape as the outer peripheral surface of the grinding wheel is formed. A multi-axis rotary dresser device that is characterized by: (2) The multi-axis rotary dresser device according to claim 1, wherein each rotary dresser has a cylindrical shape, a disk shape, or a conical shape. (3) The drive shaft of each rotary dresser has a predetermined interval in the tangential direction of the outer circumference of the grindstone and is located in parallel planes parallel to each other orthogonal to the tangential direction of the outer circumference of the grindstone. Multi-axis rotary dresser device. (4) Each rotary dresser has crowning means for tilting the parallel plane on which the drive shaft is located at a predetermined angle in either the left or right direction. Multi-axis rotary dresser device. (5) The crowning imparting means is a holder having a rotation center on a straight line passing through the center of the contact line between the outer circumferential surface of each rotary dresser and the abrasive surface of the outer circumferential surface of the grindstone. Axial rotary dresser device.