JPS58155170A - Grinder equipped with dressing device - Google Patents

Abstract

PURPOSE:To finish a grinding wheel for a short time so as to cut better by arranging a rotary dressing wheel for dressing the grinding wheel and a second dressing device for dressing the device. CONSTITUTION:A grinding wheel 6 is dressed with a rotary dressing wheel 10, which is dressed with a second dressing device 16. Thus, the rotary dressing wheel 10 can select a dressing material optimal for grinding wheel 6 without taking account of wear resistance thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a grinding machine equipped with a dressing device.

Generally, in automatic grinding machines, when the sharpness of the grinding wheel deteriorates due to cutting edge wear or clogging 9, the surface of the grinding wheel is dressed using a so-called diamond dresser.

This diamond dresser can be roughly divided into a heavy stone dresser (with one diamond at the tip) and a full-form rotary dresser in which many diamond grains are embedded in the surface of the rotating body.The dressing work in the former is as follows:
When the grinding wheel finishes grinding the workpiece and the grinding wheel table retreats, the dresser device attached to the device is driven, and the weighted dresser is traversed while feeding a predetermined amount of cut to the rotating grinding wheel external station. ! After doing so, the dredging device is raised to a position where it does not interfere with the grindstone table.

Even in the latter case, the dressing is similarly performed by placing the dressing at the 1 position and then rotating both of them, cutting the dresser by a certain amount into the outer part of the grindstone.

However, in the above-mentioned single-sided dredges, the abrasive grains arranged intermittently and irregularly on the outside of the grinding wheel interfere with the tip of the one-eared grind at one point, causing irregular vibrations. Islands (, the roundness of the outer periphery of the grinding wheel is poor, and the straightness of the outer periphery generatrix is poor. When machining with such a grinding wheel, it is difficult to obtain high shape accuracy of the workpiece. To compensate for such defects, if a large number of trap passes are taken, the dressing time is I feel stiff.

In addition, due to the irregular vibrations during dressing, unnecessary tartness is generated in the binder in the abrasive grains of the grinding wheel, which may easily cause the abrasive grains to fall off during grinding operations and cause fractures, leading to initial wear. This causes the shape of the grindstone to change (Zn1k), which causes an inefficient state where the grinding ratio is small, so K wants to avoid such a phenomenon in order to perform highly accurate and efficient grinding.

For this rLK, -1-rediamond v ′j/1i
When dressing with KFi, the dressing time is shorter than that of a heavy diamond dresser, but
Contrary to the above, the abrasive grains of a grinding wheel are subjected to a large number of diamonds, and the abrasive grain edge is worn out. Each tube has its advantages and disadvantages, such as the fact that the finished shape of the workpiece is too high and the precision of the finished shape is too high.In addition, a rotating pressurized dresser is used when it is not necessary to finish the workpiece. The compressive force destroys the abrasive grain binding agent of the grinding wheel, resulting in a grinding wheel that cuts well but is prone to falling off.

This idea was developed in view of the above-mentioned drawbacks of the conventional technology.
Compared to a heavy diamond dresser, dressing is carried out in a shorter time and shaping is performed using a dressing wheel with less hardness difference compared to the grinding wheel, so damage caused to the grinding wheel during dressing11 [tl! In addition to making the grindstone sharper, the aim is to ensure that the shape of the whetstone is high (and the sharpness is good).

For this purpose, the present invention provides a method for dressing a grinding wheel with a full-form rotary dressing wheel, and dressing the dressing wheel with a second dressing device for its bottom shape. iIt
Embodiments of the present invention will be described in detail below with reference to the drawings.

1 and 82 show the case where this invention is applied to an internal grinding machine.
A grindstone stand 2 installed so that it can be moved backwards, and this grindstone stand, 2
A grinding wheel spindle 4 rotatably driven by a motor M is installed on the grinding wheel head 2, and a machining spindle is mounted on the cutting table 3. 6 installed n.

The respective tips mK are gripped and the grinding wheel 6 and workpiece W are opposed to each other.

The grinding wheel head 2Fi and the cutting table 3 are moved forward from their origin position (dress position shown) to the grinding position by a cylinder or the like not shown WA, and are also trapped to move back to the dress position. When the reciprocating cage is in operation, the cutting table 3Fi can be moved in a direction perpendicular to the advancing and retracting direction of the grinding wheel 6 by means of a driver (not shown), a feed screw, etc., and the workpiece is Grinding work is performed on the inner surface of W.

Also, on the main table 1 there is a motor for the grindstone head 2.
A second grinding wheel head 8 for dressing that can be moved in and out through a feeding mechanism such as a ball screw 7 is disposed. A complete Lomeli type dressing grindstone 10 is provided via a grindstone spindle 9.

Furthermore, 11 KFi U-shaped frames are erected above the second grinding wheel spindle 9, and this frame 11Kt! %-/M, and can be raised and lowered via a feeding mechanism such as a ball screw 12, and in the lowered position contacts the dressing grindstone 1° to dress it! A dressing device 13 of s2 is provided.

This second dressing device 13t! Above frame 11
A spindle frame 14 that is vertically guided and raised and lowered by a screw 12, and a spindle frame 14 that can be rotated via a shaft M provided on one side of the spindle frame 14. f' spindle #15, located at the tip of the spindle #15 and vertically opposed to the dressing grindstone lO - Merry type diamond grinder dresser 1
It consists of 6.

Therefore, in the circular grinding machine configured as described above, the grinding wheel 6 completes the grinding process, and the grinding wheel 2 is quickly returned to the dressing position. The grinding wheel 6 and the dressing wheel 1O are rotated and in contact with the outer surface mt of the grinding wheel 6, and the outer periphery of the grinding wheel 6 is dressed due to the difference in peripheral speed.

When the dressing work of the t callus is completed, the grinding wheel 6 is sent to the processing position again and the n1 grinder W is processed.

Here, the dressing whetstone 10 is based on the abrasive grains, binder, and manufacturing method that are normally used, and therefore wears itself when dressing the grinding whetstone 6. The above grinding wheel 6
At the same time as processing the work WK, the second dressing device 13 descends, and the diamond dresser 16 provided at the tip of the dressing wheel 10KI[+] performs the dressing of the dressing wheel 10KI[+].

The above-mentioned dressing whetstone 10 has a wide selection of abrasive grain materials, hardness, particle size, binder type and manufacturing method, etc., and can be freely set according to the finished state of the dressing whetstone, that is, the grinding wheel. Because it is a rotary type, the dressing time is shorter than that using a conventional weight-type diamond grinder dresser, and dressing is performed using abrasive grains with a small difference in hardness, which reduces the degree of destruction of the grinding wheel and reduces initial wear4. Compared to 4, which uses a 10-tally type diamond-shaped V-shape, it has the above-mentioned features such as being able to be recycled into a grinding wheel with good sharpness due to its constituent materials and manufacturing method.

Incidentally, although a rotary diamond grindstone TT is used for dressing the above-mentioned dressing grindstone, the dressing work of the dressing grindstone is carried out during the grinding process, so that the working time is sufficiently wasted. therefore,
A single-stroke diamond dresser can be used to form the dressing stone.

Third. FIG. 4 shows an embodiment of a grinding machine using a weight diamond device as the second dressing device, which slides the water vK held on the work spindle l via a ball screw feed mechanism 21. A movable grinding wheel head ρ and an rt installed in one part of this grinding wheel head ρ
The grinding wheel 24 is rotatably held at the tip of the grinding wheel spindle, and the grinding wheel 24 on the other side 11 of the grinding wheel stand ρ is also separated from the grinding wheel 24 via the ball screw feeding mechanism δ. A second grindstone head for dressing that can be accessed is provided on the top of the second grindstone spindle n.
It is equipped with a layered dressing grindstone 28, and furthermore, this dressing grindstone row is installed on a second grindstone stand, is supported by the frame 4, and is equipped with a grindstone M for cutting feed 9. A cutting table I that is slidably reciprocated along with the dressing grindstone 28 by a dressing grindstone 10, a dresser 31 supported by this cutting table 30 and sent in the trap pass direction by a motor M, and a cutting table located at the tip of this dresser 31. A second dresser device comprising 32 weight diamond chips provided opposite to the dressing grindstone row is provided.
ing.

Therefore, when the dressing grindstone foot finishes dressing the grinding wheel waste, the dressing grindstone row retreats to a position where it does not interfere with the grinding wheel, and then the dresser 31 of the second dresser device 33 moves forward, and the dressing grindstone row finishes dressing the grinding wheel waste. As the diamond tip blade cuts into the outer periphery,
Ta Mu sends torano (su direction same) n1 multiple ζ1rL
By repeating this step, the dressing grindstone row is formed.

In the figure, M, . . . , M are motors for feeding the cut and driving the spindle, respectively.

As described above in detail by implementation, the grinding machine KTo equipped with the dressing device according to the present invention dresses the grinding wheel with the full-form rotary dressing wheel as described above, and also 1. The WL shape is performed using a II2 dressing device for shaping, and the dressing can be completed in a shorter time than when dressing the grindstone using a conventional single-stroke diamond dresser, and the shape accuracy is also improved. Furthermore, the damage caused to the grinding wheel (slips on the abrasive grains and binder) can be adjusted by selecting the type and manufacturing method of the dressing wheel. Wear phenomena can be prevented as much as possible, and since the dressing process involves contact between the grinding wheels compared to the one using a rotary diamond cage dresser, we have taken into account the material between the two grinding wheels, etc. The grindstone can be set so that it can be finished in a sharp state, and therefore has practical effects such as being able to finish the whetstone with good sharpness.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a circular grinder according to the present invention, Fig. 2 is a side view of the same, Fig. 3 is a plan view showing another embodiment of the invention, and Fig. 4 is a plan view of the same. . 6.24. , grinding wheel 8.26. , 9 feeding units 10.2B, , dressing grindstone 14.30. , second feeder 9 units (14,, spindle frame, 30 6. cutting table) 13.33. , second dressing device or more

Claims (1)

[Claims] (1) Nine feeders arranged to move forward and backward with respect to the grinding wheel, a rotary dressing attached to the feeder and driven to rotate, and a rotary dressing that approaches and separates from the grinding wheel to dress it. A grinding wheel for wrinkle dressing, a feeding table for wire 2 which is arranged so as to be able to move forward and backward with respect to the grinding wheel for wrinkle dressing, and a dressing device for forming wire 2 for forming the grindstone for dressing, which is attached to the feeding table. Grinding machine with dressing device.