JPS62148138A - Tool cutting edge position setting device - Google Patents

Abstract

PURPOSE:To make it possible to correct the position of the cutting edge of a tool to an accurate position, by providing two sensors adapted to make into contact with the cutting edge of the tool to be measured, in the respective directions of the two-dimensional coordinate axes so that comparing computation is made to the distances of positions of the sensors from the original point. CONSTITUTION:A first resistor 44a temporarily registers thereon a position with respect to the X- and Y-coordinate axes, at which position the cutting edge of a tool makes into contact with a touch sensor, and is subjected to the designation of a write mode from a signal circuit section 2 so that if it has the recognition, the registered coordinate value is delivered to a computing section 41. A second register 44b registers thereon a original point data which has been obtained with the use of a reference tool, and which may be written thereon through a keyboard 43, and the registered value is delivered to the computing section 41 each time as necessary. The computing section 41 computes the offset value of each tool in accordance with the input values from two resistors, and stores the computed values in a memory section 42. The offset value stored in the memory section 42 is read out as necessary to be used for correcting the position of the tool.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a tool cutting edge used for inputting coordinate values from the origin of the cutting edge on the tool rest when setting a tool on the tool rest turret of an NC machine tool. The present invention relates to a position setting device, and particularly to a tool edge position setting device that sets a reference tool and corrects data based on the offset amount of each tool based on the distance from the origin determined by the reference tool to the sensor of the tool edge position setting device. It is something.

[Conventional technology]

When setting a tool on the tool post turret of an NC machine tool, the coordinate position of the tool from the origin on the tool post is usually measured using a high performance conduction type limit switch.

[Problem that the invention seeks to solve]

In that case, measure the coordinates of the origin using one tool as a reference tool, measure the cutting edge of the other tools each time, and record the measured values, + and - signs, and axis direction (X, Z). The calculations were done manually, taking into account the data, and then each memory was specified and entered. For example, in order to correct 12 tools, 24 manual calculations and 24 input operations were required. For this reason, not only is it time-consuming, but there are also problems with correction accuracy caused by correction errors and individual differences. To solve this problem, there are three important issues: saving labor, preventing correction errors, and improving correction accuracy.

An object of the present invention is to solve the above-mentioned problems by automatically importing tool measurement values and automatically inputting tool position corrections into a storage means, thereby preventing measurement errors and correction errors. An object of the present invention is to provide a tool cutting edge position setting device that makes it possible to simplify the handling of a measuring instrument, improve the degree of correction, and shorten measurement time.

[Means for solving problems]

In order to achieve the above object, the present invention includes a tool support that holds a tool and is movable in a first direction and a second direction;
a mechanical origin determined within a range of movement of the tool support; a first servo motor for driving the tool support in a first direction; and a second servo motor for driving the tool support in a second direction. 2
A tool edge position setting device for a numerically controlled machine tool, comprising: a servo motor; and a control means for controlling the positions of the first and second servo motors to control the position of the tool support. a measuring device main body that is placed within a processing range of 1,111 people; a first sensor that is located on the outer periphery of the measuring device main body and outputs a touch signal when it comes into contact with the cutting edge of the tool from a first direction; a second sensor that is located on the outer periphery of the tool and generates a touch signal when it comes into contact with the cutting edge of the tool from a second direction; and from each touch signal generation position of the first sensor and the second sensor to the origin. a second storage means for storing distances of the tool support from the origin when a specific tool cutting edge contacts the first sensor or the second sensor and generates a touch signal; At the same time, the distance from the touch signal generation position of the sensor (first sensor or second sensor) with which the specific tool cutting edge came in contact with the memory of the second storage means to the origin is accepted, the former is subtracted from the latter, and a correction value is obtained. A tool cutting edge position setting device comprising a calculation means for calculating the calculation means, and a third storage means for storing the correction value at the first sensor and the correction value at the second sensor of a specific tool obtained from the calculation means. is used as a means.

[Effect]

By using the above means, two sensors, one that contacts the cutting edge of the tool to be measured from the first direction, which is the direction of each of the two-dimensional coordinate axes, and the sensor that contacts the cutting edge of the tool to be measured from the second direction, can be used.
The tool edge position from the origin detected by the two sensors is compared with the distance from each sensor position to the origin, a correction value is calculated, and the tool edge position can be corrected to the correct position.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to examples and drawings.

FIG. 1 is a schematic configuration diagram showing an example of a tool cutting edge position setting device embodying the present invention. In the figure, the tool edge position setting device A includes a sensor section 1, a signal circuit section 2, an address section 3, an arithmetic section 41, a memory section 42, a keyboard 43, and two registers 44a and 44b. The tool cutting edge position setting device (hereinafter abbreviated as device)
A processes data for each tool input via interface C. The first register 44a is the coordinate axis X or the coordinate axis Z at the time when the touch sensor receives contact.
It temporarily registers the relative position, and upon receiving the designation of the write mode of the signal circuit section 2 and recognizing it, inputs the registered coordinate values to the calculation section 41. The second register 44b is for registering the origin data obtained using the reference tool, which is also written by the keyboard 43 and input to the calculation section 41 whenever necessary. The calculation unit 41 calculates the offset amount for each tool based on the input from the two registers, and stores it in the memory unit 42. The offset amount stored in the memory section 42 is read out by manually selecting a parameter from the keyboard 43 as needed, and is used for correcting the tool position.

FIG. 2 is a plan view showing the sensor section 1 of an example of a device embodying the present invention. The sensor section 1 can be installed on an arm swingably attached to an NC machine tool and can be moved there, or can be moved between a detection position and a retreat position during workpiece machining using other moving means. In FIG. 0, the sensor unit 1 includes one touch sensor in each direction (+ and -) of two coordinate axes X and 2, that is, a sensor 11x on the positive side of the X axis with respect to the sensor core 10
X-axis negative side sensor L2x, Z-axis positive side sensor IL
2 and a Z-axis negative side sensor 122, a total of four touch sensors are provided. On the other hand, the cutting edges of the reference tool 50 and the target tool 51 are shown in the respective origin positions, and for example, in order for the cutting edge of the target tool 51 to touch the X-axis positive side sensor llx, the distance shown as Xl is Similarly, in order to touch the Z-axis positive side sensor IIZ, it is necessary to move a distance indicated as zl. When the cutting edge of the target tool 51 comes into contact with, for example, the Z-axis plus side sensor 112, the sensor section 1 issues a signal, and the movement amount Zl counted by the NC control device at that moment is registered in the register 44a. Note that since this signal circuit is wired independently to each sensor, it can indicate which address it is. Since the first designated selection is self-held in the address section 3, even if a sensor other than the held sensor is touched, no signal is sent, which serves as a confirmation to prevent operational errors.

Additionally, the signals themselves are coded differently for each touch-sensitive call, and can be used to process the data as shown in Table 1 below.

Table 1 □ For the position from the origin, the distance from the origin (0,0) to each touch sensor determined using the reference tool shown in Figure 2 (X10.X20°Zlo, Z2 (1)
shall be entered in advance.

Although the input may be performed by actually bringing the reference tool into contact with the touch sensor and measuring, it is usually easier to input the parameters using a keyboard with the set origin of the reference tool as the machine origin. Examples are shown in Table 2 below.

Table 2 When measuring, for example, Xl with respect to the target tool, the address section 3 simultaneously addresses the memory in which the data XIO of the reference tool for the same sensor 11x is stored, so when Xl is measured, NG control is performed. The calculation unit 41 of the device B calculates the offset amount=XL−XLQ, and stores this in the memory unit 42 as the offset amount regarding the X axis of the target tool.

In this case, measurements related to one coordinate axis are Xl or X
2, zl or Z2. The reason why the sensor unit 1 is equipped with touch sensors in both directions for each coordinate axis and four types of reference tool data is prepared is to facilitate support for various types of tools that differ depending on the purpose of the cent tool. be. FIG. 4 is a plan view showing an example of contact between a touch sensor embodying the present invention and various tools. Figure (a) is an example where the target tool is an external diameter bit.
Since the cutting edge 51 of the outer diameter cutting tool faces outward, that is, towards the Z-axis minus side in the figure, the contact partners are the two-axis plus side sensor 112 and the X-axis plus side sensor llx.
There is no other choice but to choose.

FIG.
That is, since the blade faces toward the Z-axis plus side in the figure, the Z-axis minus side sensor 122 and the X-axis plus side sensor IIX are selected as contact partners. In Figure (c), the target tool is for groove machining such as an external thread cutting tool.
Measure the protruding tip with the X-axis positive side sensor 11)C,
It is appropriate to measure the outer surface of the threaded portion 51 with a two-axis positive sensor llz. Figure (d) is an example of an internal diameter tool.Since the cutting edge points outward, it is most important to measure the tip with the Z-axis positive side sensor ILz, and the cutting edge is oriented along the X-axis. It cannot be contacted unless it is the negative side sensor L2x.

In Figure (E), the target tool is a drill, and the cutting edge 51 of the drill is measured by the Z-axis positive side sensor ttz, and the side surface of the drill is measured by the X-axis negative side sensor 12x.

Next, the procedure for writing the offset amount of the tool measured by the above device into the memory unit 42 will be explained with reference to the operating procedure flowchart shown in FIG.

■ Select the coordinate axes that will be the reference for measurement and the sensor that will be the contact partner, and set the parameters. For example, X! l
If the X-axis plus side sensor Llx is to be used to write the offset amount for the lI coordinate into the memory, parameter #6618 (Table 2) of the reference tool is set.

■ Check the origin of the turret in manual mode.

■ Turn on offset write mode specification. L.E.
D lit.

■ The coordinate value display value (position external) is automatically reset to (0,0).

■ Select the tool for which you want to write the offset amount and its offset number.

■ Manually bring the target tool into contact with the specified sensor. If the sensor corresponds correctly, the touch sensor signal (for example, X0FSTI) is activated as described above, calculation is performed, the offset amount is displayed on the position external, and the value is stored in the memory section 42.

■ Perform the same procedure for the Z-axis.

■ Repeat steps ■ to ■ for all tools and write the offset amount.

■ Turn off offset write mode.

With the above configuration and operating procedure, the offset amount of the tool cutting edge position can be easily measured and stored by the touch sensor.

The present invention is not limited to the above-mentioned embodiments, but can be implemented in various ways. FIG. 3 shows an example of the sensor selection circuit of the signal circuit section 2 in another embodiment of the present invention. It is a partial circuit diagram. That is, as will be described in detail below, this is an example used for blade edge measurement in automatic operation. In the figure, the output of the sensor section 1 and the input of the signal circuit section 2 are 5
The first line (#L3200) and switch 30 are for setting the IF included mode, and the second to fifth lines are connected via on-off switches. Lines #13201 to #13204) and switches 31 to 34 are connected to each of the four touch sensors and are used to specify writing.

For example, if you want to detect the movement amount X1 of the target tool 51 with respect to the X-axis plus side sensor llx in FIG.
The second switch 31 in FIG.
All you have to do is turn on and hold it by itself, and even if the cutting edge of the tool accidentally touches the Z-axis sensor 112 in that state, the fourth line (#L 32 Q 3) will be cut off by the switch 33. Therefore, mistakes such as inputting the coordinate value at that time as the value of Xl can be prevented. Then, only when the cutting edge of the tool comes into contact with the designated sensor IIX, a signal is sent through the second line (#13201) and switch 31 to input the correct X1 value. In addition,
When used for automatic measurement of automatic machines such as FMS, similar specifications are made for each tool in the address section 3 to prevent errors in which detected data is input as belonging to another tool. be able to. The address section 3 also has a function of calling up an address in a memory that stores data of a reference tool regarding a designated coordinate axis and sensor and making it correspond.

〔Effect of the invention〕

As explained above, according to the present invention, three touch sensors are provided that are arranged in three directions that can correspond to tools to be measured of various shapes, and the cutting edge of the tool to be measured is arranged in two directions with respect to one tool. In order to measure the coordinate values of the axis, the direction of the axis, + and - signs are automatically imported via the touch sensor, and the distance from the origin to the touch sensor determined using the reference tool and the coordinates of the tool to be measured are calculated. A tool edge position setting device is provided that automatically inputs an offset amount into a memory unit. The tool edge position setting device according to the present invention can have great effects in preventing correction errors, improving correction accuracy, and shortening working time.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of the tool cutting edge position setting device of the present invention;
FIG. 2 is a plan view of the sensor section of the present invention, FIG. 3 is a partial circuit diagram of the signal circuit section of the present invention, FIG. 4 is a plan view showing examples of contact between various tools and the sensor according to the present invention, and FIG. The figure is a flowchart of the operating procedure. A...Tool cutting edge position setting device C...Interface 1...Sensor section 2.
...Switch section 3...Address section 41.
...Arithmetic section 42...Memory section 43...
・Keyboard 30 to 34...Switch 50...Reference tool 5
1... Applicable tool patent applicant Hitachi Seiki Co., Ltd. Fang 1 Figure X- Figure 3 Figure 4

Claims (1)

[Scope of Claims] A tool support that holds a tool and is movable in a first direction and a second direction, an origin on a machine determined within a movement range of the tool support, and the tool support. a first servo motor for driving the tool support in a first direction; a second servo motor for driving the tool support in a second direction; and a second servo motor for controlling the position of the tool support. A tool cutting edge position setting device for a numerically controlled machine tool having a control means for controlling the position of a second servo motor, comprising: a measuring device main body carried into a machining range of the tool support; a first sensor located on the outer periphery of the measuring device main body that outputs a touch signal when it comes into contact with the cutting edge of the tool from a first direction; a second sensor that outputs a touch signal; a second storage means that stores each distance from each touch signal generation position of the first sensor and the second sensor to the origin; The amount of movement of the tool support from the origin when contacting the sensor or the second sensor and emitting a touch signal is simultaneously determined by the sensor (first a calculation means that receives the distance from the touch signal generation position of the sensor or the second sensor) to the origin and subtracts the former from the latter to obtain a correction value; A tool edge position setting device comprising a third storage means for storing a correction value and a correction value obtained by the second sensor.