JPH04223868A - Numerical control grinder - Google Patents

Abstract

PURPOSE:To prevent a work trouble generated with a grinding resistance becoming larger at the changing time of a workpiece, in a numerical control grinder. CONSTITUTION:A decision means 1 deciding as to whether or not the material of workpiece set at the change time of a workpiece is same as that of the workpiece worked one before, a grinding wheel correction means 2 executing the correction of the grinding wheel in the case of being decided as a different material by this decision means, and an execution means 3 executing this grinding wheel correction means, are provided.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a numerically controlled grinding machine that controls a machine tool based on an NC program and processes a workpiece.

0002

[Prior Art] Conventionally, in such a grinding machine, the grinding wheel was corrected by using a pre-stored NC program.
This is done at regular intervals.

0003

[Problems to be Solved by the Invention] However, the state of wear on the surface of the grinding wheel varies depending on the material of the workpiece to be ground. In particular, with superabrasive grindstones that have long intervals between grinding wheel corrections, the difference in wear conditions is significant, so when changing the material of the workpiece, the grinding resistance may increase due to the difference in the surface condition of the grindstone.
In such a case, there is a problem that machining troubles such as burning and cracking of the workpiece are likely to occur.

0004

[Means for Solving the Problems] The present invention has been made to solve the above-mentioned problems, and as shown in FIG. A determining means 1 for determining whether the material is the same as that of the previously machined workpiece, and an executing means 3 for executing the grinding wheel correction means 2 when the determining means 1 determines that the material is a different material. It is something that

[0005]

[Operation] When changing the workpiece, the determination means 1 determines whether the material of the workpiece to be machined is the same as the material of the previously machined workpiece, and if it is determined that the material is different, the execution means 3 The grindstone correction means 2 is executed to correct the grindstone.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings. In FIG. 2, 10 is a grinding machine, and 20 is a numerical control device. The grinding machine 10 includes a grindstone head 11 having a grindstone G and a table 13 on which a workpiece W is placed. The grindstone head 11 and the table 13 are driven by servo motors 12 and 14 driven by drive circuits 16 and 17, respectively.
It is adapted to be moved in the axial and Y-axis directions. A headstock 50 and a tailstock 51 for supporting both ends of the workpiece W are arranged facing each other on the table 13, and are rotationally driven by the workpiece W. The tailstock 51 has a grinding wheel correction tool 5.
The grinding surface of the grindstone G is ground into a desired shape by the relative movement of the table 13 and the grindstone head 11.

The numerical control device 20 includes an arithmetic device 21,
Consisting of a storage device 22, a pulse generation circuit 23, and interfaces 26, 27, and 28, the pulse generation circuit 2
A command pulse sent from the drive circuit 3 is supplied to drive circuits 16 and 17. The storage device 22 has N
A program recording area PMA that stores a C program, and a pulse generation circuit 2 that analyzes and processes this NC program.
3, a numerical data storage area NDA that stores transmission data to be sent to 3, a machining data storage area MDA that stores NC data and grinding conditions, and a machining status memory that stores the machining conditions and machining status of the previously machined workpiece. Area MPA is provided.

A workpiece selection button 37 for specifying the next workpiece to be machined when changing the workpiece W is also connected to the interface 26, and a workpiece selection button 37 for inputting data into the storage device 22 is connected to the interface 26. A data writing device 36 and a bubble cassette input/output device 34 storing an NC program are connected. With the above configuration, the operation of the numerical control device 20 will be explained with reference to the flowchart of FIG. 3.

After setting the workpiece W on the headstock 22, the operator presses the workpiece selection button 37 to which the workpiece W has been set.
By pressing , the program of the present invention is started. In step 100, the set workpiece W is made of one material based on the data stored in the machining data recording area MDA and the machining data of the previously machined workpiece stored in the machining situation storage area MPA. It is determined whether the material is the same as that of the previously machined workpiece. If it is determined that they are the same, the process advances to step 120. In step 120, the number N11 of machining stored in the machining status storage area MPA is compared with the number N21 of machining appropriate for executing grindstone correction for the material of the workpiece W stored in the machining data storage area. It is determined whether N11<N21 or N11≧N21. N11<N
If it is determined that it is 21, the process proceeds to step 110 and NC
Grinding is started according to the grinding cycle stored in the program. If it is determined in step 120 that N11≧N21, the process proceeds to step 122 and correction of the grindstone G is executed. Then, the process proceeds to step 124, where the processing number counter is reset (N=0), and step 110
Then, the grinding process starts according to the grinding cycle.

If it is determined in step 100 that the material of the set workpiece W is different from that of the previously machined workpiece, then in step 102 the data stored in the machining data storage area MDA is The material of the set workpiece W is set by . Then, in step 104, a grindstone correction interval suitable for the material of the workpiece W is specified using data stored in advance in the machining data storage area MDA. In step 106, the grindstone is corrected regardless of the processing status of the grindstone G up to now. Then, in step 108, the processing number counter is reset (N=0), and the process proceeds to step 110, where grinding is started according to the grinding cycle. When the grinding process is started, counting of the number of processes is started in step 112.

As described above, according to the numerically controlled grinding machine of the present invention, when the material of the workpiece to be machined is changed, the grindstone is corrected, and the grindstone correction interval is changed to suit the material of the workpiece. . Therefore, grinding can be performed at intervals of grindstone correction appropriate to the material of the workpiece. Furthermore, since the grindstone is corrected when the workpiece is changed, the grinding resistance does not increase due to a change in the material of the workpiece. Therefore, there is no risk of processing troubles such as burning or cracking occurring when changing the material of the workpiece.

0012

[Effects of the Invention] According to the numerically controlled grinding machine of the present invention, when changing a workpiece, the determination means determines whether the material of the workpiece is the same as the material of the previously machined workpiece, and determines that the material is a different material. In this case, the execution means executes the grindstone correction means to correct the grindstone, so that the grinding resistance does not increase when changing the workpiece. Therefore, processing troubles such as burning and cracking do not occur when changing the workpiece. In particular, the use of the present invention is highly effective for superabrasive grindstones in which the intervals between grindstone corrections are long and the wear conditions of the grindstones are significantly different due to differences in materials.

[Brief explanation of the drawing]

FIG. 1 is a diagram corresponding to claims of the numerically controlled grinding machine of the present invention.

FIG. 2 is a diagram showing the configuration of a numerically controlled grinder according to the present invention.

FIG. 3 is a diagram showing a flowchart of the process of determining the material of a workpiece and determining the timing of grindstone correction according to the present invention.

[Explanation of symbols]

1 Judgment means 2. Grindstone correction means 3. Execution means 10 Grinding machine 20 Numerical control device 52 Whetstone correction tool G Whetstone W Workpiece

Claims (1)

[Claims] [Claim 1] For a grinding wheel mounted on a grinding wheel head,
In a numerically controlled grinding machine equipped with a grinding wheel correction means that moves the grinding wheel correction tool relatively to correct the grinding wheel, when starting processing a workpiece, the material of the next workpiece to be processed is the same as the previous one. Numerical control grinding characterized by comprising a determining means for determining whether the material is the same as the material of the workpiece, and an execution means for executing the grindstone correction means when the determining means determines that the material is a different material. Board.