JPS62152647A - Tool tip measurement - Google Patents

Abstract

PURPOSE:To permit the improvement of correction accuracy and the reduction of a measuring time, by applying a tool for slot cutting to 1st and 2nd sensors which produce a signal when they approach to the center of a sensor including each of axes where the tip position of a tool on a tool post intersects at a right angle for thereby determining a coordinate value of the tool tip. CONSTITUTION:When the tip of a target tool 51 makes contact with a sensor 11Z on the positive side of a Z axis, a sensor unit 1 produces a signal and at the moment the amount of movement Z1 counted by an NC control unit is registered in a register 44a. Since a signal circuit is independently wired for respective sensors, they are capable of indicating address positions and since the initially designated sensor is self-held at an address unit 3, no signal is supplied even if a contact is made with sensors other than this one, which serves as a confirmation for preventing an operation mistake. In the case that the target tool is such as a thread cutting tool for cutting a slot the projected tip of the tool is measured by a 1st sensor 11X on the positive side of an X axis and the outer side surface of a thread cutting portion 51 is measured by the 2nd sensor 11Z, whereby the improvement of correction accuracy and the reduction of a measuring time are permitted.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a method for determining the position of the cutting edge, which is used to input 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 measurement method, and particularly relates to a cutting edge measurement method in which a reference tool is set and data is corrected using offsets H from the origin determined by the reference tool for a plurality of target tools.

[Conventional technology]

When a tool is placed in 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.

rProblems to be solved by the invention] In that case, measure the cutting edge each time, and compare the measured value with +, -.
For example, when correcting 12 tools, 24 manual calculations are required. This required 24 input operations. 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, we tried to save labor: 1. Three important issues are prevention of correction errors and improvement of correction accuracy.

An object of the present invention is to solve the above-mentioned problems and automatically import the measured value of the tool along with the direction of the axis and + and - signs, and automatically correct the tool position to the storage means. To provide a cutting edge measurement method that prevents measurement errors and correction errors by inputting information and using an easy method and procedure for measuring the tool position, as well as improving correction accuracy and shortening measurement time. .

[Means for solving problems]

In order to achieve the above object, the present invention provides a first axis perpendicular to the main axis and a second axis parallel to the main axis in a numerically controlled spiritual movement.
a turret that moves along an axis; a first servo motor that drives the turret along a first axis; a second servo motor that drives the turret along a second axis; 1 and 2
a control means for controlling the movement position of the servo motor; an origin determined at a specific position within the movement range of the tool post; a measuring body that can be carried within the moving range of the tool post; and a measuring body on the outer periphery of the measuring body. and a first sensor that is located at a specific position from the origin and generates a touch signal when the tool tip position of the tool post comes into contact with the center of the sensor including the second axis; and a second sensor that is located at a specific position from the origin and outputs a touch signal when the tool tip position of the tool rest approaches the center of the sensor including the first axis, and a second sensor on the outer periphery of the measurement main body. A third sensor is located at a position symmetrical to the first sensor and at a specific position from the origin, and outputs a touch signal when the tool tip position of the tool rest comes into contact with the sensor center ci including the second axis. , When the tool cutting edge moves and comes into contact with any of the first, second, or third sensors mentioned above, the moving distance from the origin of the tool post is captured from the control means by a touch signal, and the cutting edge position is determined. means for applying the cutting edge position of the outer diameter tool to the second sensor and the third sensor to obtain the coordinate values of the cutting edge position of the outer diameter tool, and also applying the grooving tool to the first sensor and the second sensor to determine the groove. This method uses a cutting edge measurement method that determines the coordinate values of the cutting edge position of a processing tool.

[Effect]

By using the above means, by bringing the cutting edge of the outer diameter tool (reverse hand) into contact with the second and third sensors provided on the outer periphery of the measuring body, By bringing the positions of the cutting edges of the groove machining tools into contact with each other, the positions of the cutting edges of the respective tools are corrected.

〔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 presetter and an NC machine tool embodying the present invention.

In the figure, the tool presetter A consists of a sensor part 1, a signal circuit part 2, and an address part 3, and is
The control device B' includes an x- and z-axis control circuit 4 that is a control means for controlling the position movement of a servo motor 46 that drives the tool rest.
5. It is equipped with an arithmetic unit 41, a memory unit 42, a keyboard 43, and two registers 44a and 44b, and the NC control system processes data for each tool inputted from the tool presetter A via the ink face C. The first register 44a is for temporarily registering the position regarding the coordinate axis X or the coordinate axis Z at the time when the touch sensor receives contact, and if the writing mode is specified by the precenter side and recognized, the position is registered. The coordinate values are input to the calculation unit 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 42 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 unit 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 tool precenter embodying the present invention. The sensor section 1 can be mounted 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 machining using other moving means. In the figure, the sensor unit 1 includes one touch sensor in each direction (+ and -) of two coordinate axes X and Z, that is, a sensor L on the positive side of the X axis with respect to the sensor core
1x, a negative X-axis sensor L2x, a positive Z-axis sensor 112, and a negative Z-axis sensor 122. 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, the cutting edge of the target tool 51 is
In order to touch the axis plus sensor llx, it is necessary to move a distance indicated as Xl, and similarly, in order to touch the Z axis plus sensor 11Z, it is necessary to move a distance indicated as Zl. When the cutting edge of the target tool 51 contacts, for example, the Z-axis plus side sensor 112, the sensor section 1 emits a signal, and at that moment the NC control device 1
The movement ff1Z1 counted in register 44a
will be registered. 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.

Furthermore, the signals themselves are also coded differently for each touch sensor, and can be used to process the data as shown in Table 1 below.

Table 1□□□□□□□□B On the other hand, regarding the position from the origin, the distance Nil from the origin (0,0) to each touch sensor was determined using the reference tool shown in Figure 2. (X 10.X20゜ZLo
, 220) are input in advance.

The input may be made by actually touching the touch sensor with the reference tool, but it is easier for Tsutomu to enter the parameters using a keyboard, using the center 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 corresponding to the same sensor 11'x4 is stored, so that the total Xl is 11111. Then, the calculation section 41 of the NC control device 1B calculates the offset amount=XL-XIQ, and stores this in the memory section 42 as the offset amount viewed on the X axis of the target tool.

In this case, measurements related to one coordinate axis are Xi or X
2, Zl or Z2. The reason why the sensor section is equipped with touch sensors in both directions of each coordinate axis and four types of reference tool data are prepared is to facilitate support for various types of tools that differ depending on the purpose of the cent target tool. 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 in which the target tool is an external cutting tool, and since the cutting edge 51 of the external cutting tool is facing outward, that is, towards the negative side of the Z-axis in the figure, the contact partner is on the Z-axis. There is no other choice but to select the plus side sensor llz and the X-axis plus side sensor llx.

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 llx are selected as contact partners. In Figure (c), the target tool is for groove machining such as an external thread cutting tool.
The protruding tip is measured with the X-axis positive side sensor 1, and the outer surface of the threaded part 51 is measured with the 2-axis positive side sensor 1.
It is appropriate to measure at 12. Figure (d) is an example of an internal diameter tool, and the cutting edge is directed outward, so
The most important thing is to measure the tip with the Z-axis positive side sensor llz, and the direction of the cutting edge is measured with the X-axis negative side sensor L2.
If it is not x, it cannot be contacted.

In Figure (E), when the target tool is a drill, the cutting edge 51 of the drill is measured by the Z-axis positive side sensor 112, and the side surface of the drill is measured by the X-axis negative side sensors 1, 2x.

Next, the procedure for writing the tool offset amount of the tool precenter into the memory section 42 of the NC control device 1B 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, when using the X-axis plus 0111 sensor IIX to write the offset amount in the memory for the X-axis coordinate, set the reference tool parameter 66618 (Table 2).

■ 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, xOFST I) 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 off-cent writing mode.

With the above configuration and operating procedure, the position of the tool tip can be easily measured by the touch sensor.

The present invention is not limited to the above-mentioned embodiments, but can take various embodiments. FIG. 3 shows a partial circuit showing an example of a sensor selection circuit of a signal circuit section in another embodiment of the present invention. It is a diagram. That is, as will be explained in detail below, in Figure 0, which is an example used for blade edge measurement in automatic operation, the output of the sensor section 1 and the input of the signal circuit section 2 are five lines, each of which is turned on and off. The first line (#132QO) and switch 30 are for setting the off-cent write mode, and the second to fifth lines (#L3201 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 5■ in FIG. 2 with respect to the X-axis plus side sensor llx,
The second switch 31 in FIG.
All you have to do is turn on and hold it by itself. Even if the cutting edge of the tool accidentally touches the Z-axis sensor 112 in that state, the fourth line (#13203) will be disconnected because the switch 33 is disconnected. This prevents mistakes such as inputting the coordinate values of Xl as the values of Xl. Then, the second line (#13
201) and switch 31 to cause the correct Xl value to be entered. Note that when used for automatic measurement of automatic machines such as FMS, similar specifications are made for each tool in the address section 3, preventing errors in which detected data is input as belonging to a different tool. can also be prevented. 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 described above, according to the present invention, three or four touch sensors arranged in three or four directions are provided, and in order to measure coordinate values in two directions for one tool, Axial direction, +.

The distance between the origin and the touch sensor determined using the reference tool and the tool to be measured is W.
By providing a tool presetter that automatically inputs the 4fJ offset amount into the memory section, it is possible to achieve great effects in preventing correction errors, improving correction accuracy, and shortening work time.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of the tool presec of the present invention, Fig. 2
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 of the present invention, and FIG. 5 is a plan view of the sensor section of the present invention. It is a flowchart of the operating procedure. A...Tool presetter B...NC control device 1C.
...Interface 1...Sensor section 2...Switch section 3...Address section 41...Calculation section
42...Memory part 43...Keyboard 30-34...Switch 50...Reference tool 51.
・Target tool fang 1 diagram ×- Figure 3

Claims (1)

[Scope of Claims] A numerically controlled lathe comprising: a tool rest that moves along a first axis perpendicular to the main axis and a second axis parallel to the main axis; and a first axis that drives the tool rest along the first axis. a servo motor; a second servo motor that drives the tool post along a second axis; a control means that controls the movement positions of the first and second servo motors; a measuring body that can be transported within the movement range of the tool post; and a measuring body that is set at a second position on the outer periphery of the measuring body and at a specific position from the origin. a first sensor that outputs a touch signal when it comes into contact with the center of the sensor including the axis; a second sensor that outputs a touch signal when it comes into contact with a sensor center that moves toward the center of the sensor; a third sensor that generates a touch signal when the tool edge position moves toward the center of the sensor including the second axis and makes contact; and the tool edge moves and comes into contact with any one of the first, second, or third sensor. processing means that receives the moving distance of the tool post from the origin from the control means in response to a touch signal when the tool is pressed, and calculates the position of the cutting edge; A method for measuring a cutting edge in which the coordinate values of the cutting edge position of the groove processing tool are determined, and the coordinate values of the cutting edge position of the groove processing tool are determined by applying the groove processing tool to a first sensor and a second sensor.