JPH0626791B2 - Wheel grinding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a truing method of a grindstone using super-hard abrasive grains in a grinding apparatus.

<Prior Art> For the truing of a grindstone of ultra-hard abrasive grains such as a CBN grindstone, a single stone made of a rotary truer or a polygonal pyramid diamond,
I use a multi-stone diamond lure to traverse.

<Problems to be Solved by the Invention> The runout of the grindstone is removed by making a cut as a truing and repeating the traverse several times. However, even with the same traverse speed, if the rotation speed of the lure is increased, the feed pitch of the lure per rotation of the lure becomes smaller, and the surface shape of the grindstone becomes fine irregularities, which increases the resistance when grinding the work, while the wobble of the grindstone increases. Are removed.

Conversely, if the rotation speed of the lure is decreased, the feed pitch of the lure per rotation of the lure becomes large, and the surface of the grindstone becomes rough and uneven, which reduces the resistance when grinding the workpiece, but the wobble of the grindstone is difficult to remove. I got it.

<Means for Solving Problems> In view of the above-mentioned conventional problems, the present invention sets the number of truing times (reciprocation) of a grindstone by a truer, and among the number of truing times, other than the final number, the truer per rotation of the truer is set. The feed pitch of the lure is made small, and the feed pitch of the lure per one rotation of the lure is made large at the last one.

<Operation> In the present invention, the wobble of the grindstone is removed by the truing having a small feeding pitch of the lure per one rotation of the lure, and the whetstone having a sharp cutting ability is obtained by the truing having the large feed pitch of the lure per one rotation of the lure. It is a surface shape.

<Examples> Examples of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 10 denotes a bed of a grinding machine, and this bed 10
A grindstone base 11 is mounted on the top so as to be able to move forward and backward. Whetstone stand 11
Is rotatably supported by a grindstone 12 of ultra-hard abrasive grains such as diamond or CBN. This grindstone 12 is driven by a grindstone driving motor 13 installed on a grindstone base 11 to transmit a belt transmission 14
It is adapted to be rotationally driven via. The grindstone base 11 is moved forward and backward by a feed mechanism using a servomotor 15 as a drive source.

A table 17 is placed on the bed 10 and
Between the headstock 18 and the tailstock 19 installed on the workpiece 17, the workpiece W
Spindle drive motor 20 mounted on the headstock 18
It is adapted to be rotationally driven by.

Reference numeral 21 denotes a truing device installed on the grindstone base 11, and the truing device 21 allows the workpiece W to be moved by the grindstone 12.
Each time a certain number of grindstones are ground, the whetstone 12 is trued.

The truing device 21 has, as drive sources, a motor 25 for rotationally driving the rotary truer 22, a first servomotor 23 for advancing and retreating for giving a cut, and a second servomotor 24 for traversing in the grindstone axis direction. It has a feeding mechanism.

Reference numeral 30 is a numerical controller for controlling the first and second servomotors 23 and 24 and the motor 25. The numerical controller 30 mainly comprises an arithmetic processing unit 32, a memory 33, a pulse distributor 34, an interface 36 and an input device 41.
Reference numeral 31 is a drive circuit for the first and second servomotors 23 and 24, and pulses are distributed from the pulse distributor 34 to control the cutting and traverse feed of the truing device 21. 40
Is a motor speed control circuit, which receives the output of the arithmetic processing unit 32 through an interface 36 and controls the rotation speed of the rotation driving motor 25 of the truer 22.

Further, the input device 41 sets the number of truing times of the grindstone, the rotation speed of the truer 22, and the traverse speed, and stores them in the memory 33.

Therefore, as one embodiment of the present invention, the true luer 22
Number of times of traversing n-1 for which the number of times of traverse n is set
The truing of the grindstone 12 is performed by controlling the high speed rotation other than the last rotation and the last rotation at the low rotation speed. This operation will be described with reference to FIGS. 2 to 4.

First, as shown in FIG. 3, the traverse number n (the number of truing) of the truer 22 is set by the input device 41,
It is stored in the memory 33. Then, as shown in FIG. 4, the lure 22 is rotated at a high speed, and as shown in FIG.
22 forward feed A to grindstone 12 and further feed B
Is performed, and the traversing C is performed for the set number of traverses n−1 times to perform truing. As a result, since the amount of truing per traverse of the traverse is large, the wobbling of the grindstone is eliminated. Then control the rotation speed of the lure 22 to a low speed,
A final cut is made for traverse D once, and a large feed pitch of the lure 22 in the traverse direction per revolution of the lure is formed, whereby a sharp whetstone surface is formed. Then, the truer 22 is moved backward to complete the grinding wheel truing cycle.

In the above embodiment, the rotation speed of the lure 22 is changed to a high speed and a low speed to perform the truig. However, as another embodiment, the traverse speed is slowed up to the traverse number n-1 times and the last time. The traverse speed may be increased once, or the traverse may be repeated up to n-1 times.
The same action can be obtained by increasing the rotation speed of 22 and slowing the traverse speed, and decreasing the rotation speed of the lure 22 and increasing the traverse speed once in the final round.

<Effects of the Invention> As described above, according to the present invention, in the truing other than the final truing set, the feed pitch of the truer per one rotation of the truar is reduced to remove the wobbling of the grindstone and the final truing is performed. Since the truing is performed by increasing the feed pitch of the lure per 1 rotation of the lure, the wobbling of the whetstone that causes chattering occurs just before the truing. It has the effect that a good grinding wheel surface can be created and work with low resistance can be obtained.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is an overall view in which a block diagram is added to a plan view of a grinding apparatus, and FIG. 2 is an explanatory view of a truing operation of the present invention, FIG. 3 and FIG. Is a flow chart of the operation of the present invention. 11 …… Whetstone stand, 12 …… Whetstone, 21 …… Truing device,
22 …… truer, 30 …… numerical control device.

Claims (4)

[Claims] 1. In a grinding device in which a grindstone made of ultra-hard abrasive grains is rotatably mounted on a grinding wheel stand, the number of truing times of the grindstone by a truer is set, and the wobble of the grindstone is excluded in the truing other than the final truing. In order to achieve this, the feed pitch of the lure per revolution of the lure is made small, and in the final truing, the feed pitch of the lure per revolution of the lure is increased so that a good cutting edge of the grindstone is formed. 2. A method for changing the feed pitch of the truer per one revolution of the truer, wherein the truer is rotated at a high speed in the truing other than the final number of the truing times, and is rotated at a low speed in the final time. How to truing a whetstone. 3. A method for changing the feeding pitch of the lure per one revolution of the lure, in which the traverse speed of the truer is slowed in the truing other than the final truing and the traverse speed is increased in the final tluing. A method for truing a grindstone according to the item. 4. A method of changing the feed pitch of the lure per one revolution of the lure, in which the truing is performed at a high speed and the traverse speed is slowed in the truing other than the final truing, and the traverse is rotated at a low speed in the final truing. The truing method for a grindstone according to claim 1, wherein the speed is increased.