JPH04193473A - Grinding condition setting device for grinding machine - 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 applications The present invention relates to a grinding condition setting device for a grinding machine.

Conventional technology Traditionally, the rotation speed and feed rate (
The table feed rate) is determined by the experience and intuition of the grinding operator. In other words, the grinding operator observes the movement of the work before grinding and the movement of the workpiece, so that the grinder can perform the grinding work under optimal grinding conditions.

In addition, when setting the grinding conditions, they referred to the table attached to the grinding machine that lists recommended feed rates for the main materials.

Problems to be Solved by the Invention However, the conventional method described above has a problem in that in order to obtain optimal grinding conditions, sufficient experience and intuition must be developed, and skill is required. In addition, the table attached to the grinder only lists classifications for materials, so settings for workpiece diameters, etc. must rely on experience and intuition; There was also the problem of not being able to do so.

The present invention solves the above-mentioned problem, and aims to provide a grinding condition setting device for a grinding machine that can accurately obtain the optimum grinding conditions for the grinding machine.

Means for Solving the Problems In order to solve the above problems, the grinding condition setting device for a grinding machine of the present invention connects a tachometer to the grindstone drive motor that rotates the grindstone, and adjusts the feed speed U of the workpiece and the grindstone width t. and a rotation speed n of the workpiece to set the overlapping ratio γ of the grinding wheel expressed by the formula γ = 1-U/ (t 11n) and a setting device for setting the ratio of the circumferential speed of the workpiece to the circumferential speed of the grinding wheel, The optimum rotational speed and feed rate of the workpiece are calculated from the setter rotation rate, circumferential speed ratio, rotational speed of the grinding wheel, external diameter of the grinding wheel, width of the grinding wheel, and external diameter of the workpiece, and the optimum rotation of the workpiece is calculated. A control calculation unit is provided to control the main shaft drive motor for rotating the workpiece and the drive motor for feeding the workpiece support table so that the number and feed rate are optimal.

Effect With the above configuration, simply by setting the overlap rate and circumferential speed ratio, the workpiece is moved and rotated at the optimal rotation speed of the workpiece and the optimal feed rate of the workpiece support table according to the workpiece shape, grinding material, and machining conditions in each case. Ru. Therefore, it is necessary to conduct tests in advance to determine the optimal overlap ratio and circumferential speed ratio according to various workpiece shapes, grinding materials, and machining conditions. By inputting the information, you can always grind the workpiece under the optimal grinding conditions.

Example Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a schematic configuration diagram of a grinding condition setting device system for a grinding machine according to an embodiment of the present invention.

In FIG. 1, 1 is a grinding wheel of a grinding machine, 2 is a workpiece to be ground by this grinding wheel 1, and the grinding wheel 1 is a grinding wheel servo motor 3.
The workpiece 2 is rotated by the main shaft servo motor 4. Grinding wheel servo motor 3 and spindle servo motor 4
are connected to tachometers 7 and 8 and ammeters 9 and 10 for measuring the rotational speed and current value of each servo motor 3 and 4, respectively, via servo drivers 5 and 6 that drive and control the servo motors. Further, reference numeral 11 denotes a table to which the support part of the workpiece 2 and the main shaft servo motor 4 are attached, and the block 12 attached to this table 11 is connected to the bearing 13.
The table 11 is screwed onto a screw shaft 14 rotatably supported by a screw shaft 14, and the table 11 is moved in the longitudinal direction of the work via the screw shaft 14 by a table servo motor 15. A linear scale 16 is disposed in parallel near the screw shaft 14 to detect the feed rate of the table 11. Further, an ammeter 18 that measures the current value of the table servo motor 15 is connected to the table servo motor 15 via a servo driver 17 . Furthermore, a workpiece outer diameter measuring device 19 consisting of a laser sensor or the like for measuring the outer diameter of the workpiece 2 is disposed near the workpiece 2 . And each tachometer 7, 8 and ammeter 9.10.18
, linear scale 16, and workpiece outer diameter measuring device 19 are all connected to a control calculation section 20.

The control calculation unit 20 includes each tachometer 7, 8 and ammeter 9.1.
Each servo motor based on data from 0.18 3.4
．． 15, and detects the feed speed of the table 11 and the outer diameter of the workpiece 2 based on data from the linear scale 16 and the workpiece outer diameter measuring device 19. Each servo motor 3, 4.15 is driven and controlled via the servo motor 3, 4.17. Further, a setting device 21 is connected to the control calculation section 20, and this setting device 2
1 includes the grindstone width dimension, the grindstone outer diameter dimension, the circumferential speed ratio k (the rotation speed of the workpiece 2 relative to the rotation speed of the grindstone 1), and the following (
The overlapping rate γ (as shown in FIG. 2, the ratio of the overlapping hatched portions of the grindstone 1 when the workpiece 2 rotates once) is set as shown by the formula a).

γ=1-U/(t@n)...(a) Here,
U is the feed speed of the table 11 (m-/th), t is the grinding wheel width (Ill), and n is the workpiece 2 (spindle servo motor 4)
is the rotational speed (rpm), and in the case of rough machining, the overlap rate γ
has a value close to O, and in the case of finishing machining, the overlap rate γ has a value close to 1. Furthermore, a display 22 is also connected to the control calculation unit 20, and the display 22 shows the current values of each servo motor 3, 4, 15, workpiece 2 (spindle servo motor 4) and grindstone 1 (grindstone servo motor). 3) rotation speed, circumferential speed of work 2 and grindstone 1, and set circumferential speed ratio k. and the overlap rate γ set by 1 to the actual circumferential speed ratio. and the actual overlap rate γ are displayed.

It should be noted that the optimum overlap ratio γ according to the grinding materials and processing conditions of various workpieces has been investigated in advance through tests, and this overlap ratio γ is input to the setting device 21.

In the above configuration, when performing grinding, the setting device 21
, the grinding wheel width dimension, the grinding wheel outer diameter dimension, and the circumferential speed ratio k (
Usually it is set to a constant value, for example about 1%),
The optimum overlap rate γ is input and set. Then,
In the control calculation unit 20, the circumferential speed of the grindstone 1 is calculated from the rotation speed of the grindstone servo motor 3 and the outer diameter of the grindstone, and the optimum circumferential speed of the workpiece 2 is calculated from the circumferential speed of the grindstone 1 and the set circumferential speed ratio. The optimum rotation speed of the work 2 (spindle servo motor 4) is calculated from the optimum circumferential speed of the work 2 and the outer diameter dimension of the work 2 detected by the work dimension measuring device 19.

At the same time, the optimal feed rate of the workpiece 2 (table 11) is calculated from the setter rate γ0, the grindstone width dimension, and the optimal rotation speed of the workpiece 2. Then, the spindle servo motor 4 and the table servo motor 15 are drive-controlled via the servo driver 6.17 so that the workpiece 2 has an optimum rotational speed and an optimum feed rate.

In addition, in the 1 display section 22, each servo motor 3.4.
15 current value, the rotational speed of work 2 (spindle servo motor 4) and grinding wheel 1 (grinding wheel servo motor 3), the circumferential speed of work 2 and grinding wheel 1, the set circumferential speed ratio ko, and the actual circumferential speed ratio by one setting. Rate γ.

The actual overlap rate γ is displayed digitally at any time, and the status of each servo motor 3.4.15 can also be easily understood as numerical data. When each servo motor 3, 4.15 becomes overloaded and the current value exceeds a certain value, this overload state is detected by the control calculation unit 20 and the servo motor 3, 4.15 is decelerated. It looks like this.

As a result, by simply setting the optimal overlap rate γ, each servo motor 3, 4.15 is automatically set to the optimal state according to the workpiece shape, grinding material, and machining conditions in each case, and the workpiece 2 is always Grinded under optimal grinding conditions. Therefore, defects in the workpiece 2 can be reduced, and the life of the grindstone 1 can be increased, and productivity can be improved without much effort.

Effects of the Invention As described above, in the past, it was difficult to derive the optimal grinding conditions due to the large number of grinding parameters, but according to the present invention, the optimal grinding conditions can be determined by using the overlap rate as a parameter. Easy to set, overlapping ratio and circumferential speed ratio settings,
In practice, the workpiece can be ground under optimal grinding conditions by simply setting the overlap rate. This improves work efficiency and makes it possible to achieve high productivity.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a grinding condition setting device system for a grinding machine according to an embodiment of the present invention, and FIG. 2 is an enlarged view of a workpiece grinding location. 1... Grinding wheel, 2... Workpiece, 3... Life grinding wheel servo motor, 4. Pot metal spindle servo motor, 5゜6.17...Φ
Servo driver, 7, 8・O・tachometer, 9.10.18
-...Ammeter, 11...φ table, 15...Table servo motor, 16...Linear scale, 19 Pot...
・Workpiece outer diameter measuring device, 20... φ control calculation unit, 21...
・Setting device, 221111・Display device.

Claims (1)

[Claims] 1. A tachometer is connected to the grindstone drive motor that rotates the grindstone, and the grindstone is expressed by the formula γ=1-U/(t・n) using the workpiece feed speed U, the grindstone width t, and the workpiece rotation speed n. A setting device is provided to set the overlapping ratio γ and the circumferential speed ratio of the workpiece to the circumferential speed of the grinding wheel. Calculate the optimum rotational speed and feed rate of the workpiece from the outer diameter dimensions of A grinding condition setting device for a grinding machine, characterized in that it is provided with a control calculation section that controls the grinding conditions.