JPH03154777A - Grinding method and device by cup type super abrasive grain grindstone - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] "Industrial application field" This invention grinds hard members such as cemented carbide, ceramics, diamond sintered bodies, CBN sintered bodies, etc. using a cup-shaped superabrasive grindstone. The present invention relates to a grinding method and an apparatus therefor.

``Conventional technology'' Diamond,
A method of grinding is performed by pressing a component against the grinding surface of a grinding machine that rotates a cup-shaped superabrasive grindstone such as CBN. In this method, as the grinding process progresses, the grinding surface becomes uneven, deformed, and clogged, so the process is interrupted in the middle of grinding and dressing and truing are performed using a WA (alundum), (JC grindstone, etc.). There is.

"Problem to be Solved by the Invention" The dressing and truing described above are usually performed by removing the workpiece (object to be ground) from the grinding machine and attaching a brake dresser to the grinding machine. The dresser may be stick-shaped or cylindrical, but in any case, simply pressing it against the surface of the grinding wheel is insufficient, so it is usually oscillated.

However, although rocking is effective for dressing,
There is a problem in that it tends to impair the flatness of the grinding surface, leaving people dissatisfied with the correction of the grinding wheel surface.

In addition, there is a problem in that during dressing, processing operations must be interrupted, workpieces must be removed, dressers must be attached, and the efficiency of the grinding operation is significantly reduced.

"Means for Solving the Problems" This invention focuses on improving a grinding device using a cup-shaped superabrasive grindstone, which is most used for grinding cemented carbide chips, ceramic chips, etc., and a processing method using the same. can be,
WA, GC whose abrasive surface contacts parallel to the abrasive surface of the whetstone
This is a device in which a cup-shaped grindstone such as the above is attached to the grinding device, and a grinding method thereof.

The present invention will be explained below with reference to the drawings. FIG. 1 is a partially sectional side view showing a specific example of the present invention, and FIG. 2 is a sectional view showing the relative positions of the grinding surfaces of both grinding wheels and a workpiece.

As shown in the drawing, a cup-shaped superabrasive grindstone 1 is supported by a spindle unit 2 of a grinding machine and rotates in the direction of the arrow. A workpiece 1a such as a carbide tip is pressed against the grinding surface 11 of a rotating cup-shaped superabrasive grindstone for grinding.

The grinding machine of the present invention is equipped with a dressing mechanism. As shown in FIG. 1, this mechanism is such that a WA, Go cup-shaped grindstone 3 serving as a dresser is mounted so that it is rotated in the direction of the arrow by a motor 4.
The rotating shaft 5 of the cup-shaped grindstone 3 is attached to a support 6, and the other end (upper part) of the support 6 is screwed to a pole screw 7 rotated by a stepper motor 9 to form a guide 8.
It is designed to move left and right by sliding.

"Function" Cup-shaped super abrasive grindstone 1 and cup-shaped grindstone 3 in this device
, the positional relationship of the work 1o is as shown in FIG. The grinding process is carried out using the grinding surface 1 of the rotating cup-shaped super-abrasive grinding wheel 1.
This is done by pressing the workpiece 1o onto 1. If the abrasive surface 11 becomes uneven or clogged due to grinding, the workpiece 1 should be removed in a timely manner.
o away from the grinding surface 11, the stepper motor 9 rotates the pole screw 7, and the cup-shaped grindstone 3 is removed together with the support 6.
is moved to the left to bring the abrasive surface 13 into pressure contact with the cup-shaped superabrasive grindstone 1 to perform dressing. A suitable incision for dressing is 5 to 100 μm. For example, diamond metal pound grindstone (cup-shaped super abrasive grindstone) 1
rotates at 1,800 to 3,600 rpm, and the WA tr as a dresser is 80 to 1,000 force.
~50 rpm.

When the dressing is completed, the cup-shaped grindstone 3 is separated from the grinding surface 11, the workpiece 10 is again pressed against the grinding surface 11, and the grinding process is restarted.

In this way, during dressing, the grinding surfaces of both grinding wheels are in contact with each other and move in directions almost perpendicular to each other, and since the contact surfaces move over the entire surface of the rotating grinding surfaces in sequence, the grinding surfaces are corrected to be flat and truing is also performed at the same time. be exposed.

In the above description, the grinding process and the dressing process are performed alternately, but it goes without saying that these operations may be performed simultaneously. That is, while the cup-shaped grinding wheel 5 is being rotated by the motor 4, the rotation support 6 of the pole screw 7 by the rotation of the stepper motor 9, and the cup-shaped grinding wheel 3 are sent in the direction of the cup-shaped super-abrasive grinding wheel 1, and dressing is performed with a constant cut. While performing the work, the workpiece 10 is pressed against the abrasive surface 11 to perform the grinding process, and the grinding process can be performed extremely efficiently. In this case, the dressing is not done by always maintaining a constant cut, but by changing the dressing to the grinding wheel at appropriate time intervals.
It is preferable to send

In addition, in the above, the cup-shaped grindstone 3 is rotated by the motor 4,
In other words, although we have explained the case of forced rotation, since both cup-shaped grinding wheels 1 and 3 are arranged in the positional relationship shown in Fig. 2, that is, in a mutually eccentric and parallel axial relationship, the cup-shaped grinding wheels 1 and 3 are The cup-shaped grindstone S rotates together with the frictional force between the abrasive grindstone 1 and the cup-shaped grindstone 3. During co-rotation, most of the abrasive surfaces move in directions perpendicular to each other, so dressing is performed. Although this will slightly reduce the dressing effect, it is possible to simplify the apparatus by omitting the motor for driving the cup-shaped grindstone 3.

Of course, it can also be a dual-use device.

Note that the drawings are diagrams for explaining the configuration of the embodiment of the present invention, and if the positional relationship and operation of the cup-shaped superabrasive grindstone, the dressing cup-shaped grindstone, and the work perform the functions described above, Associated supports, rotation mechanisms,
Any structure and position of the feed mechanism etc. may be selected.

For example, the support body may be moved from side to side by hydraulic pressure rather than by a pole screw connected to a motor.

"Effects of the Invention" The present invention provides a cup-shaped grindstone for dressing in the main body of a grinding machine that performs grinding, and uses the cup-shaped grindstone to perform grinding and dressing alternately or simultaneously without removing the workpiece. Grinding can be performed with extremely high efficiency. Furthermore, since dressing with a cup-shaped whetstone does not require rocking of the whetstone unlike dressing with a stake-shaped or hook-shaped whetstone, the grinding surface can be sufficiently corrected and trued at the same time as dressing, improving the flatness of the grinding surface. This has the effect of improving grinding accuracy.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view showing a specific example of the present invention, and FIG. 2 is a front view taken along the line A--A. 1° force-pull type super abrasive grindstone 2 spindle unit 3: cup-shaped grindstone (for dressing) 4° motor 5: rotation axis 6° support 7 double pole screw 8 double guide
10: Work 11.13: Abrasive surface

Claims (1)

[Claims] 1. A grinding method in which a workpiece is brought into contact with the grinding surface of a rotating cup-type super-abrasive grindstone, in which a cup-type for dressing rotates on the grinding surface of the cup-type super-abrasive grindstone. Grinding method 2 using a cup-shaped super-abrasive grinding wheel characterized by dressing the grinding surface of the grinding wheel by contacting it, the cup-shaped grinding wheel for dressing is pressed against the rotating cup-shaped super-abrasive grinding wheel and rotates together with the rotating cup-shaped super-abrasive grinding wheel. 3. Grinding method 3 according to claim 1, characterized in that the workpiece is rotated or forcibly rotated. 4. Grinding method 4 according to claim 1 or 2, characterized in that the dressing operation is performed simultaneously or alternately with the grinding of the workpiece. 4. Rotation In a grinding machine equipped with a cup-shaped superabrasive grinding wheel, another cup-shaped grinding wheel having an eccentric axis perpendicular to the grinding surface of the grinding wheel is provided so that the grinding surfaces of both wheels are pressed against each other. A grinding device 5 using a cup-shaped super-abrasive grindstone, characterized in that the other cup-shaped grindstone is provided to rotate on its own axis or to rotate together with the rotation of the cup-shaped super-abrasive grindstone. Grinding device using cup-shaped super abrasive grinding wheel