JPH04210373A - Automatic correction device for grinding wheel of numerical control grinder - Google Patents

Abstract

PURPOSE:To quickly execute the specified grinding wheel correction by providing a moving means which relatively moves a grinding wheel correction tool and grinding wheel, based on an extracted grinding wheel correction part cycle. CONSTITUTION:A grinding wheel correction part cycle corresponding to a cumulative notch quantity is extracted by an extract means 21. Then a grinding wheel G is subjected to dressing in the specified shape, with a grinding wheel correction tool D and grinding wheel G being relatively moved, based on this extracted grinding wheel correction part cycle by moving means 15, 16.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to an automatic grindstone correction device for a numerically controlled grinding machine.

``Conventional technology'' The conventional method of changing the shape of a numerically controlled grinding wheel is to perform a dressing cycle using a dressing locus that matches the shape of the grinding wheel to be changed, with a depth of cut that does not increase the load on the dresser. Starting from a predetermined starting point, the dressing cycle is repeated several times.

``Problem to be Solved by the Invention'' However, when attempting to change the shape of a grindstone by repeating the dressing cycle several times using a dressing locus that matches the shape of the grindstone to be changed as described above, when the change starts, As shown in Figure 6, in several cycles, the grinding wheel is corrected only in a part of the grinding wheel, and the movement of the part that is not in contact with the grinding wheel becomes a wasted movement, resulting in a problem of lengthening the cycle time. .

The present invention has been made to solve the above problems,
It is an object of the present invention to provide an automatic grindstone correction device for a numerically controlled grinding machine that can save labor through automatic operation and quickly carry out predetermined grindstone corrections.

"Means for Solving the Problem" As a specific means for achieving the above purpose, a grindstone correction cycle is repeated in which a grindstone correction tool is moved relative to a grindstone wheel mounted on a grindstone head. In the automatic grinding wheel correction device of the numerically controlled grinding machine that corrects the end face and cylindrical surface of the grinding wheel, a grinding wheel correction partial cycle is extracted according to the relative cumulative cutting amount of the grinding wheel correction tool with respect to the grinding wheel in the grinding wheel correction cycle. An automatic grindstone correction device for a numerically controlled grinding machine is provided, which is characterized in that it is equipped with an extracting means for extracting a grindstone correction partial cycle, and a moving means for relatively moving a grindstone correction tool and a grindstone wheel based on the extracted grindstone correction partial cycle.

"Function" The function of the automatic grindstone correction device of the numerically controlled grinding machine is as follows.

The extracting means extracts a partial cycle of grinding wheel correction corresponding to the cumulative depth of cut, and the moving means relatively moves the grinding wheel correction tool and the grinding wheel based on the extracted partial cycle of grinding wheel correction.

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

In FIG. 1, a table 11 is placed on the bed 10 of the grinding machine.
and grinding wheel head 12 are slidably guided in mutually orthogonal directions and are each operatively connected to a servo motor 15.16 via a lead screw 13.14. A grinding wheel G is mounted on a shaft on the grinding wheel head 12 . A headstock 17 and a psychological table 18 that support both ends of the workpiece W are placed on the table 11. A grindstone correction tool is protruded from the psychological table 18, and the relative movement between the grindstone table 12 and the table 11 is achieved by controlling the servo motor 15° 17 using command pulses from the numerical control device 20. The grinding surface of the whetstone is modified into a predetermined shape.

A numerical control device 20 that controls the relative movement between the table 11 and the grindstone head 12 is computerized. They are CPU 21, memory 22, interface 23.2
It is composed of 4 etc.

The interface 23 includes a keyboard 25 for data input.
is connected to the interface 24, and servo motor drive circuits 28 and 29 are connected to the interface 24.

The memory 22 not only stores a system program for controlling the feed of the grinding machine by performing pulse distribution, etc., but also stores a numerical control program corresponding to the grinding cycle. Further, a numerical control program corresponding to the grindstone correction cycle is stored. Furthermore, the memory 22 also stores the current shape of the grindstone, for example, if the corners are right angles, or if the corners are rounded, the radius data, etc. are also stored.

The automatic correction of the grindstone according to the present invention is performed by the numerical control device 20.
This processing is realized as processing by the CPU 21 based on a numerical control program corresponding to a predetermined grindstone correction (hereinafter referred to as "dressing") cycle, and the flowcharts in FIGS. 2 and 3 outline the processing. Hereinafter, the process of forming a multi-stage grindstone from the flat grindstone G will be explained with reference to the explanatory diagram of FIG. 4.

In the flowchart of FIG. 2, in step 100, the position of the grindstone correction tool (hereinafter referred to as dresser) D is stored. To memorize the dresser position, as shown in FIG. 4(A), the tip of the left end surface of the flat grindstone G is brought into contact with the tip of the dresser D.
This is done by memorizing its position. In step 101, a dressing start position (offset amount a') in the cylindrical direction is specified (FIG. 4(B)). In step 102, the cylindrical dress amount is specified. Then, in step 103, the step amount al of each step required for the dress is determined.

a! , and further input data such as one dressing amount ΔC and dressing speed. And step 104
Then, automatic grindstone correction processing is executed based on the above-mentioned dressing start position, dress drive-in amount, each data, and the multi-stage grindstone correction program.

FIG. 3 is a flowchart showing an outline of the grindstone automatic correction process.

First, in step 200, a parameter n for counting the number of cuts and a parameter i for counting the number of stages are each set to an initial value of 1. Then, in step 204, the step amount a+ of the first stage is set as the comparison value g for performing cycle extraction.

In the following step 206, the cumulative cutting amount C, is calculated using the following formula % formula % (1), and in step 212, the cumulative cutting amount C, and the comparison value g are compared, and if the cumulative cutting amount C, is larger, step 208 If it is smaller, proceed to step 214.
Proceed to.

In step 208, 1 is added to the parameter i to increase the number of stages, and in step 210, the comparison value g is updated, and the process returns to step 212.

On the other hand, it is determined whether the number of stages indicated by the parameter i is larger than the total number of stages, and if it is larger than the total number of stages, in step 218, the cut is made by ΔC, all the dress cycles are executed, and the process proceeds to step 220. If it is smaller, a dress cycle is extracted from the number of stages indicated by the parameter i and the process proceeds to step 220.

In step 220, if the cumulative cutting amount C1 is greater than or equal to the sum of the step amounts a of each step plus flb (total dressing amount), the process is terminated, and if it is less than that, in step 222 the number of cutting Parameter n to count
1 is added to , and the process returns to step 206, whereupon the above processing is repeated. Specifically, when modifying a flat whetstone into a stepped whetstone with a total number of stages of 2 as shown in Fig. 4, the n-th cumulative cutting amount C, (C, =(n-1)
△C-a') is the first level difference amount a, or if it is less than the dressing execution path, is extracted, and the cumulative cutting amount C of n times is extracted.
, is greater than or equal to the first level difference amount a1 and less than the first level difference amount a10 and the second level difference amount a2, the dressing execution path L2 is extracted, as shown in FIG. 4(D). Then, dressing is performed in a shortened dressing cycle between the extracted dressing execution route and the dressing start position. Then, when the cumulative cutting amount C7 becomes larger than the first step amount a and the tenth second step amount a2 (Fig. 4 (E))
Execute all dress cycles L, as shown in FIG.

As a result of the above, it is possible to omit unnecessary dressing cycle paths in which the dresser D and the grindstone G do not come into contact with each other, thereby shortening the dressing time.

In the above embodiment, the grindstone correction device is provided on the table 11, but the present invention is not limited to this, and a grindstone correction tool may be provided on the bed 10 so as to be movable relative to the grindstone G.

In addition, as another example, instead of extracting the movement locus of the grinding wheel correction cycle, as shown in FIG. It is also possible to perform the feed at a high speed, and fast forward in the portion indicated by the broken line.

"Effects of the Invention" The present invention has the above-mentioned configuration, in which the extracting means extracts a partial cycle for grinding wheel correction according to the cumulative depth of cut, and based on the partial cycle for grinding wheel correction extracted by the moving means, the grinding wheel correction tool and the grinding wheel are Since predetermined dressing is automatically performed by moving the vehicle relative to each other, it has an excellent effect of saving manpower and shortening the dressing time.

[Brief explanation of the drawing]

Attached drawings FIG. 1 is a block diagram showing the configuration of a specific embodiment of the present invention, FIGS. 2 and 3 are flowcharts showing an outline of the processing of the CPU, and FIG. FIG. 3 is an explanatory diagram explaining the dressing process shown in FIG. 3, FIG. 5 is an explanatory diagram showing another embodiment, and FIG. 6 is an explanatory diagram showing the conventional dressing process. 11. Table 12. ,,Whetstone head, 15゜1
6. Servo motor 20. ,,numerical control device,2
1, CPU, 22. ,,Memory, G31. Whetstone. Figure 4 (A) CB) (E) Fast forward m--1 1 is greater than the total number of stages Figure 6

Claims (1)

[Claims] In an automatic grinding wheel correction device for a numerically controlled grinding machine, which corrects the end face and cylindrical surface of the grinding wheel by repeating a grinding wheel correction cycle in which a grinding wheel correction tool is moved relative to the grinding wheel mounted on a grinding wheel head. , extraction means for extracting a grinding wheel correction partial cycle according to the relative cumulative cutting amount of the grinding wheel correction tool with respect to the grinding wheel in the grinding wheel correction cycle; An automatic grindstone correction device for a numerically controlled grinding machine, characterized in that it is equipped with a means of moving a vehicle relative to each other.