JPH0117823B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for writing tool position data in a tool storage magazine, in which tool position data in the tool storage magazine is rewritten when the tool is replaced due to a change in the workpiece to be machined. The present invention relates to the above method suitable for a return type tool storage magazine.

In general, in a tool storage magazine indexing device that allows random return of the tool by returning the tool to an arbitrary holding position in the tool storage magazine, the holding position of the tool changes every time the tool is replaced, so the tool It is necessary to always remember the correspondence between the holding position of the tool and the tool held at that holding position.

Therefore, this type of tool storage magazine indexing device is provided with a memory that stores the numbers of tools stored in the tool storage magazine at addresses corresponding to the holding positions where the respective tools are held. When the holding position of a tool changes due to a tool change, the memory position of the corresponding tool number is rewritten so that the necessary tool can be indexed to the tool change position even after the tool change. There is.

By the way, in such a tool storage magazine indexing device, when the type of workpiece to be machined is changed and the tool used is replaced with a tool group with a different number, the contents of the memory are naturally updated. The number must be rewritten according to the number of the tool in the tool group used for machining the next different workpiece, but the number common to the tool in the tool group used to machining the previous workpiece must be Even if a tool is attached with a common number, there is a problem in that it is not apparent in which holding position the tool with the common number is being held. This is because, as described above, the holding position of the tool and the tool held at that holding position sequentially change each time the tool is replaced. Therefore, when replacing tools, it is necessary to attach the tools to the tool holding positions in numerical order for convenience, and then rewrite the tool number in order to match the tool holding position and the corresponding tool number storage position. becomes.

In this way, in the past, it was necessary for the operator to write the number of the tool attached to each tool holding point one by one using a data writing device, so it took time to write the tool number and it took time to change the setup. Not only does it take a long time, but if the correspondence between the tool holding position and the tool number is incorrect, the tool number may not be written correctly, and in this case, there is a drawback that indexing control cannot be performed correctly.

In view of these conventional problems, the present invention has been devised to accurately and rewrite tool numbers when a common number is assigned to a plurality of tool groups used for machining different types of workpieces. This can be done in a short time, and examples thereof will be described below based on the drawings.

In FIG. 1, 10 is a tool storage magazine rotatably mounted on the machine tool main body (not shown);
A plurality of tool holding devices H0 to H7, for example eight, are arranged at equal intervals on the outer periphery of the magazine 10, and are numbered clockwise with identification numbers from 0 to 7.

Reference numeral 11 denotes a spindle head, on which a spindle 12 is rotatably mounted and a tool changing arm 13 is provided. This tool exchange arm 13 is adapted to be driven by an arm drive device 15.
When a tool exchange command is given from a numerical control device 40, which will be described later, the tool held on the spindle 12 and the tool at the tool exchange position 14 of the magazine 10 are exchanged.

The rotation shaft 20 of the magazine 10 is connected to a magazine drive device 21, and this magazine drive device 21
The rotary shaft 20 is rotated in accordance with a command given from the index control circuit 30. Also,
The index plate 22 having a protrusion 23 on its outer circumference is connected to the rotating shaft 20 via a gear so that it rotates once when the magazine 10 rotates by one pitch, that is, the distance between two adjacent tool holding devices. There is. Each time the magazine 10 rotates one pitch and each tool holding device is indexed to the tool exchange position 14, the opposing proximity switch 24 is actuated, thereby sending an indexing signal to the indexing control circuit 30. It's becoming like that.

A known numerical control device 40 is a tape reader 4.
Based on the numerical control data on the paper tape PT read in step 1, command pulses are distributed to the servo motor drive device (not shown), thereby controlling the machining of the workpiece. When data is read, these data are output to the index control circuit 30.

When this indexing control circuit 30 is given T-code data from the numerical control device 40, it indexes the tool specified by the T-code to the tool changing position 14. This indexing control circuit 30 has a core memory. A non-volatile and rewritable memory device 31 consisting of the following is connected. This memory device 31 stores the holding position of each tool by writing the tool number of the tool stored in each tool holding device in a memory address corresponding to the number of the tool holding device stored therein. In addition to a position storage area 31a, a control data area 31 stores the number of the tool mounted on the spindle 12, the number of the tool holding device indexed to the tool exchange position 14, etc.
b is provided.

The memory device 31 also includes a data area 31 for fixedly storing numbers 0 to 7 corresponding to the tool holding devices H0 to H7 as initial position data.
c is provided, and when the transfer command switch TCS connected to the index control circuit 30 is operated, the transfer program shown in the flowchart of FIG. 2a is executed.
By TCR, this numerical data of 0 to 7 is used as the tool number as the leading number of the tool position storage area 31a.
Data are transferred in order starting from TNA0.
Therefore, in this embodiment, numbers from 0 to 7 are used as tool numbers.

That is, as shown in FIG. 3, tool groups t10 to t17 and t20 to t2 are required to process different types of workpieces W1, W2, ... Wn, respectively.
7, ..., 0 to 7 for each of tn0 to tn7
number is assigned as a common tool number, and when the workpiece to be machined changes, the tools of the tool group necessary for machining the next workpiece are assigned the tool holding number corresponding to each tool number. Attach it to devices H7-H7, and then operate the transfer switch TCS.
As a result, the transfer program shown in Figure 2a
TCR is executed.

In this transfer program TCR, first in step 51, the first address DAO of the data area 31c is set in the read counter ROC, and the first address TNAO of the tool position storage area 31a is set in the write counter WIC, and in step 52, The data "0" fixedly stored at the address (DAO) specified by the read counter ROC is read, and in step 53, the read data "0" is written to the address (TNAO) specified by the write counter WIC. Then, in step 54, the read counter ROC
and the contents of the write counter WIC each +1
However, in step 55, it is determined whether ROC=DAO+8, that is, whether data has been written to all addresses of the initial position data 31c.If the answer is NO (N), the process returns to step 52 and the process described above is performed. The process is repeated, and if the answer is yes (Y), a return (RET) is made to the main program.

In this way, the numbers 0 to 7 fixedly stored in the data area 31c are sequentially transferred to the tool position storage area 31a as initial position data from the leading address TNA0, and thereby the tool holding device H
Tool position storage area 3 for the actual holding memory of each tool attached to 0 to H7 and the corresponding tool number
The storage location within 1a is matched.

After such a setup change, machining of a new workpiece is started, and when the T code programmed in the numerical control program is read, the numerical control device 4
T code data is output from 0 to the index control circuit 30, and the index control circuit 30 responds to the second T code data.
Execute the magazine indexing program ICR shown in FIG. b. That is, the number of the tool holding device in which the designated tool is held is stored in the tool position storage area 31a.
The rotation index of the magazine 10 is determined by referring to and determining the shortcut. After the tool is replaced, the number of the tool mounted on the spindle 12 is written to the memory address corresponding to the number of the tool holding device in which the specified tool was held, completing rewriting of the tool number.

By performing this operation every time a tool is exchanged, the relationship between the arrangement of each tool and the memory location of the tool number corresponding to each tool always matches, allowing accurate indexing control even after tool exchange. will be held.

When the type of workpiece to be machined changes, the tools in the magazine 10 are replaced with tools from the tool group necessary for machining the next workpiece, and then the transfer command switch TCS is set as described above. By pressing , you can start machining the next workpiece.

In the above embodiment, the holding position of each tool is stored by storing the tool number in the memory address corresponding to the number of each tool holding device. The present invention also applies to a device in which a tool position storage area having a memory address is provided, and the holding position of the tool is stored by writing to the memory address corresponding to the number of the tool holding device in which each tool is held. can be applied.

Even in this case, the process of transferring the initial position data to the tool position storage area is exactly the same, and only the process when indexing the magazine is slightly different.

As described above, in the present invention, initial position data representing the holding position of each tool when multiple tool groups are installed that are replaced due to a change in the type of workpiece to be machined is shared for multiple tool groups. In this method, only one set of numbers is fixedly stored in the data area, and each time a group of tools is loaded into the tool storage magazine, the initial position data is transferred to the tool position storage area and the tool position data is rewritten. Therefore, when a common tool number is assigned to the tools of multiple tool groups used for machining multiple types of workpieces, tool position data can be instantly rewritten when the tool group is changed. Not only can setup changeover time be shortened, but there is also the advantage that indexing control can be performed accurately without the risk of incorrect tool position data being written.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a block diagram showing the overall configuration of a magazine indexing device;
Figures 2a and 2b show the indexing control device 30 in Figure 1.
FIG. 3 is a flowchart showing the operation of the present invention, and is a diagram showing the tools necessary to process a plurality of types of workpieces. 10...Magazine, 14...Tool exchange position, 2
1... Magazine drive device, 30... Index control device, 31... Memory device, 31a... Tool position storage area, 31c... Data storage area, H0~
H7...Tool holding device, T...Tool.

Claims (1)

[Claims] 1 The holding positions of the plurality of tools held in the plurality of tool holding devices provided in the tool storage magazine are determined based on the relationship between the tool number of each tool and the unique number assigned to each of the plurality of tool holding devices. and storing the stored tool holding position data in a tool position storage area, and rewriting the stored tool holding position data every time a tool is replaced to match the stored position of the tool with the actual position;
A tool storage magazine in which indexing of the tool storage magazine is controlled based on rewritten holding position data and a designated tool number,
Initial position data representing the holding position of each tool constituting the plurality of tool groups when installed in the tool storage magazine is set to a common number 1 for the plurality of tool groups.
The tool set is fixedly stored in the data area, and each time the tool group is loaded into the tool storage magazine, the initial position data is transferred to the tool position storage area and the tool position data is rewritten. A method for writing tool position data in a tool storage magazine.