JPS6165313A - Setting device for coordinate system of machine tool - Google Patents

Abstract

PURPOSE:To easily set the reference of work machining by compensating an error in the machining origin of NC data in the device on the basis of the measured value of a cutting position. CONSTITUTION:Position data XDP from a machining origin after trial grinding is a value read out by a tape reader 1. A position measured value XIN contains an error based upon the position data XDP actually. The measured value data XIN is replaced with position data, and the difference between data XDP and measured position data XIN is calculated by an arithmetic means 4, whose arithmetic result is stored in a correction data memory 5 and used as a following data reference.

Description

[Detailed Description of the Invention] +11 Industrial Field of Application The present invention is a method for automatically controlling a plurality of tools by setting a plurality of tools on a tool post turret and instructing each tool to coordinate values of machining positions.
C. Regarding a coordinate system setting device for a machine tool. In particular, the present invention relates to a coordinate system setting device for a machine tool that assigns numerical values based on the machining origin of NC data to a tool controlled by orthogonal coordinates based on the machine origin.

(2) Conventional technology In NC machine tools, workpiece machining coordinates and tool control coordinates can be used in common, unless their coordinate systems are of different types, such as orthogonal coordinates and polar coordinates. Although they are numerically compatible, in reality, both the tool side and the workpiece side have delicate problems, and it is currently impossible to directly exchange data.

(3) Problems to be solved A particular problem with the above conventional technology is that on the tool side,
When multiple tools are set on the tool post turret, the position of the cutting edge of each tool has a different installation deviation from the machine origin.As a countermeasure for this, a measuring means called a tool presetter has recently been devised. However, its usage still leaves room for research. The problem on the workpiece side is that the machining origin itself changes with respect to the machine origin due to the machining allowance and distribution of trial machining before machining. They relied on the inefficient method of micro-measuring the machined surface and recalculating the relative position of each tool to the workpiece.

(4) Purpose The purpose of the present invention was proposed to solve the above-mentioned problems. It is an object of the present invention to provide a coordinate system setting device for a machine tool that can easily set a coordinate system for controlling a tool by calculating the error from the actual measured value within the device, and can improve machining accuracy.

(5) Means for Solving the Problem In order to achieve the above object, the present invention brings an arbitrary tool into contact with the work surface after trial cutting to capture the error between the NC data value and the actual measurement value. , each tool is brought into contact with the same work surface, the error from the actual measurement value is measured, and this error value is used as a correction value for each tool. Furthermore, the present invention is characterized in that by replacing the coordinate system setting values with actual values after trial cutting using the first arbitrary tool, the data is used for setting the coordinate system.

(6) Function The coordinate system setting device of the present invention tests the workpiece with an arbitrary tool, brings it into contact with the workpiece surface, measures the NC data and actual measurement values from the machining origin, and also calculates the NC data of each tool from the machining origin. By simply measuring from the beginning and using the error value between the NC data and the actual measurement value as correction data, the coordinate system can be easily set and data with good processing accuracy can be obtained.

(7) Examples Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

(A) and (I+) in FIG. 1 are explanatory diagrams showing the relationship between a workpiece and a tool in the present invention. In (a) and (n) of FIG. 1, the workpiece W is held by the chuck B,
A tool T having a machine origin ○ on the side facing the chuck B
Processed by. The chuck B can rotate while gripping the workpiece W with the Z axis passing through the center of the mounting base () and perpendicular to the mounting base H as the rotation axis, and the coordinate axis direction in this embodiment is A two-dimensional orthogonal coordinate is formed by the axis and the X-axis in a direction perpendicular to the Z-axis.

The (A) figure shows the correction regarding the radial direction, and the (+1) figure shows the correction regarding the end face cutting, but the principles and procedures are the same.

In other words, after trial cutting is completed, while keeping the cutting edge of the arbitrary tool in contact with the circumferential surface or end surface of the workpiece, read the position data XDP or ZDP from the machining origin at the cutting edge position, and at the same time measure the diameter of the workpiece with a micrometer etc. Also, the actual measured value X IN+ Z of the end face is measured. In addition,
It is assumed that the position data XDP in the X-axis direction and the actual measurement 4ax1N indicate the diameter of the workpiece W. In addition, the actual measurement value ZIN in the X-axis direction is the total length of the workpiece W in this embodiment, but the machining origin A is set appropriately, and in that case, it is determined as a numerical value supported by the actual measurement value. It is something.

The difference value between this position data and the actual measurement value is a correction value from the machining origin of the set value in the coordinate system that has already been set. In other words, the correction value is X. F+++ r ZOFIII
Then, X0FII = XDP XIN + Zorva
= ZDF XIN.

In the case of the arbitrary tool for which trial cutting was performed here, by replacing and inputting the input actual measurement values X, ..., Z, into the position data X DP + Z D, which has already been read from the machining origin. X and 2 of work coordinate system
Store it back in memory as the current value of .

That is, XIN=X□, ZIN=Z□, and so on. F.

=O9zoFII=0.

Then, the actual measurement value XIN of the cutting surface of this arbitrary tool,
The ZIN is taken into the data memory as it is as workpiece coordinate system setting data, which will be described later, and is used as a data reference from now on. The coordinate values for workpiece machining (XDP, ZゎP) into which the actual measured values X, ..., Z, are taken and the coordinate values for tool control (XA, 21 in Figure 1) are numerically compatible. In the present invention, the actual measured value XIN+ZIN
is used as coordinate system setting data.

Furthermore, while keeping the cutting edge of each tool other than the above optional tools in contact with the cutting base surface of the circumferential surface or end surface of the work W, the position of the cutting edge is read from the position data XDP or ZDP from the machining origin A (0, 0). , the actual measurement value of the workpiece obtained above
Or difference value with ZIN X0FII = XDP X
IN or ZOFII = ZDP ZIN becomes the correction data for each tool.

Figure 2 is a configuration diagram showing an example of a coordinate system setting device for a machine tool in which the present invention is implemented.
) is a configuration diagram when a touch sensor is used. First, in (a) of FIG. 2, the coordinate system setting device is a tape reader 1. which reads NC data. A keyboard with a screen that is a means of inputting actual measured values from the machining origin to the position of the cutting edge 2. Input/output circuit T10 means for sending position data from the machining origin 3. a calculation means 4 for calculating the error between the actual measurement value and the NC data value; and a correction data memory 5 for storing each calculated correction value as data. It consists of a computer program memory 6 for temporarily storing NC data, a coordinate system setting data memory 7 for storing settings for a desired coordinate system, and a CPU as a central processing unit. The keyboard with screen 2 has a CRT screen 213, character keys 22, numeric keys 231, function keys 24, as shown in FIG. It is composed of a cursor key 25, a power switch 26, and the like.

Next, a configuration in the case where the touch sensor (rl) in FIG. 2 is used will be described, but before that, an example of the touch sensor will be described using FIG. 5. In Fig. 5, a sensor P is placed on the fixed side of the machine tool, and a closed circuit is formed the moment the workpiece W and tool T come into conductive contact, and the current flowing in the closed circuit is detected by electromagnetic induction. , the signal can be used to simplify and speed up the operation of the keyboard with screen.

The configuration of the coordinate system setting device in (n) of FIG.
In (a) of the figure, which is largely the same as that already described, a touch sensor 9 is connected to the bus, and its touch signal is transmitted only on the selected side of X or 2.
It passes through gates 9a, 9b, participates in the selection of the current values of the workpiece coordinate system, and automatically reads the current values of X and Z for each tool.

The operation of the coordinate system setting device of the present invention will be explained. Fourth
The figure is a flowchart diagram showing an example of the operation of the coordinate system setting device. As for the flowchart, the X-axis and the Z-axis are the same, and since it is sufficient to explain one of them, only the X-axis will be explained here.

In Fig. 4, as the 0th stage, the workpiece W is
Try cutting it. After trial cutting is completed in the 0th stage, an arbitrary tool is brought into contact with the cutting surface of the workpiece W as shown in FIG. 1(a). When you press step ■ and button, CR7 screen 2
1, a screen as shown in the figure is selectively displayed. Therefore, as the 0th stage, when the numerical value of the workpiece diameter actually measured with a micrometer etc. is pressed using the character key 22, the numerical key 23 and the input key 24, the keyboard input value X is shown in (a) in Fig. The actual measured value (input value) XIM is taken in, and further, the actual measured value XIN passes through the AND gate 10a and is input as the 0th stage in place of the current value of the work coordinate system X. Furthermore, the actual measurement value XIN is input and stored in place of the work coordinate system X setting data.

In other words, a new coordinate system has been set based on the actual measurement value XIN. At the same time, the X-axis is operated as NC data from the Canadian program memory 6, and the current X value XP displayed on the screen as position data is in the 0th stage (as shown in Fig. 2).
A) is taken in as the current X value of the workpiece coordinate; in this case, X, , = X, .

When the above inputs are completed, each signal automatically closes the OR gate 10b and the AND gate IOC by a turn signal,
The data of the current value XDP, which has been replaced with the actually measured value XIN, is sent to the calculation means 4.

In the calculation means 4, the error X, which is the difference value between the XDP and XIN, is calculated as the 0th stage. A calculation of FII is performed. (X in this case. FII-〇) Calculated X. F-(=O) is the 0th
At this stage, the value is substituted into the X term of the arbitrary tool in the correction data memory 5 shown in FIG. 2(A) and stored.

Next, move on to measurement for each tool, bring each tool into contact with the work surface at step 0, and press the screen on button at step 0.
With that signal, OR gate 10b and AND gate IOC
In the 0th stage, the position of the cutting edge of the tool is taken in as the current value of Correction value X. F
n is calculated, and in the 0th stage, the correction data of (a) in Fig. 2 is calculated.
It is substituted into the X term of the tool in the memory 5.

When this procedure is repeated for all the tools TOX terms and 2 terms and 2 terms set in the tool post turret, the correction data memory 5 is completed.

Note that the R term in the correction data memory 5 in FIG. 2 (A) indicates the sharpness by the radius of the cutting edge, the M term indicates the tool identification flag, and the T term indicates the cutting edge when using a touch sensor. This is the location identification number.

When the touch sensor (0) in FIG. 2 is used, the row is not changed at all before entering stage 0 in the flowchart in FIG.

(8) As described in detail, according to the present invention, after trial cutting of a workpiece with an arbitrary tool, the actual measured value of the cutting position is determined;
This is a coordinate system setting device for a machine tool that can easily set a reference for workpiece machining by correcting errors related to the machining origin of NC data within the device based on the actual measurement value, and can be accurately and easily controlled. Therefore, it contributes to improved precision, automation, and efficiency in machining operations.

[Brief explanation of drawings]

(a) and (ff) in Fig. 1 are explanatory diagrams showing the relationship between the workpiece and the tool, (a) and (TJ) in Fig. 2 are block diagrams of an embodiment of the coordinate system setting device according to the present invention, and 4 is a front view of the keyboard with screen, FIG. 4 is a flowchart of the operating procedure of the present invention, and FIG. 5 is a configuration diagram of the touch sensor. W...Work T...Tool A...
Origin of processing? 5- Machine origin X, H, Z, H・
・・Actual measurement value X OF, X value of X oN-NC data Z OF,
Z oN-N Z value of C data X OFP+ X
,,...X value of correction data ZOFPI ZOFN・
... Z value of correction data 1 ... Tape reader 2
...Input means 3...Position data sending means 4...
Calculation means...Correction data memory 6...Cannibal program memory 7...Coordinate system setting 8...Central processing unit 9...
・Touchessa Ward U) Wa

Claims (1)

[Claims] A machine in which one or more tools are set on a tool post turret and NC data based on the machining origin is assigned to a machine tool that controls the machining position of each tool using orthogonal coordinates based on the machine origin. A coordinate system setting device for a machine, which includes an input means for performing trial cutting with an arbitrary tool, bringing it into contact with the work surface after the trial cutting is completed, and inputting actual measured values from the machining origin to the cutting edge position, and the actual measured values and NC data values. a calculation means for calculating miscalculated values; a position sending means for bringing each tool into contact with the workpiece surface and reading NC data values at the workpiece coordinates from the machining origin to the cutting edge position; A coordinate system setting data memory for replacing and storing coordinate system setting values, a correction data memory for storing calculated error values for each tool, and a central processing unit for controlling each of the above means. Features: Coordinate system setting device for machine tools.