JPH04210323A - Tapping device - Google Patents

Abstract

PURPOSE:To prevent a tap tool from being damaged and tapped screw threads from being damaged by calculating a reasonable stopping position of the tap tool from set position data regulating the relationship between a set rotational position and a set feed position previously set in a control unit on the basis of a detected stopping position. CONSTITUTION:An emergency stopping position detecting means 4 detects, for example, an output signal Q1-2 of a rotational position sensor 13 at an emergency stopping end point B as a rotation stopping position of a tap tool 6 by an emergency stopping signal Q3-3 outputted from a control unit 3, and outputs the quantity of electricity which corresponds to a detected rotational position, as a detected rotation stopping position Q4. A position correcting means 5 extracts set position data D from a memory 30 of the control unit 3 by means of the detected rotation stopping position Q4 outputted from the emergency stopping position detecting means 4, and calculates a reasonable, for example, feed stopping position C of the emergency stopped tap tool 6 from the extracted set position data D on the basis of the detected rotation stopping position Q4.

Description

[Detailed description of the invention] Application field of industry-1- The present invention relates to a tapping device.

BACKGROUND OF THE INVENTION A conventional tap pressurizing device includes a rotation mechanism for attaching a tap tool, a feed mechanism to which this rotation mechanism is attached via a bolt/nut mechanism, and a control unit that performs feedback control of these. The rotation mechanism rotates the tap tool in the circumferential direction due to the rotation of the spindle motor, and the feed mechanism converts the rotation of the feed shaft motor into linear motion using the bolt and nut mechanism, and this linear motion causes the tap tool to move in the axial direction. The tap tool is linearly fed and driven, and by the combined movement of the rotational drive and the feed drive of the tap tool, the tap tool processes a tap into a workpiece material (not shown).

Problems to be Solved by the Invention When the above-mentioned tap processing device makes an emergency stop during processing,
Either the spindle motor and the feed shaft motor are driven in the normal direction to continue tapping, or the spindle motor and the feed shaft motor are driven in the reverse direction to return the tapping tool. However, during an emergency stop, the servo loop between the spindle motor of the rotation mechanism and the feed shaft motor of the feed mechanism is broken, causing an imbalance between the amount of movement of the tap tool in the rotational direction and the amount of movement in the feed direction. As shown in the figure, the relationship between the rotation stop position and the feed stop position of the tap tool is the normal F.Emergency stop start point A of the characteristic line showing the relationship between the set rotation position and the set feed position. to the end point B of the emergency stop, which is the tip of the arrow X. This deviation manifests itself as twisting of the tap tool, which is mechanically the weakest, since the tap tool is attached to the rotating mechanism so as not to rattle. Therefore, when operating after an emergency stop,
While the tap tool remains twisted, specifically, the spindle motor and feed shaft motor are driven from the emergency stop end point B to continue tapping as shown by arrow Y in Figure 4 or as shown by arrow Z. This may result in the tapping tool not moving, such as returning it to the original position, which may cause the tapping tool to break or the tapped thread to break.
.

Means for Solving the Problem Therefore, in the present invention, a rotation mechanism that rotationally drives the tap tool in the circumferential direction, a feeding mechanism that linearly feeds and drives the tap tool in the axial direction, and a tap tool indicated by L are provided. A control unit that performs feedback control of the rotating mechanism and the feeding mechanism so as to perform a combined motion of the rotational drive and the feeding drive, and an emergency stop signal from this control unit that causes the tapping tool to stop at the end point of the emergency stop. an emergency stop position detecting means for detecting either the rotation stop position or the feed stop position, and settings preset in the control section in 1- above based on the detected stop position detected by the emergency stop position detecting means; The stopping position where the tap tool should be is calculated from the set position data that defines the relationship between the rotational position and the set feed position, and based on this calculation result, either the rotation mechanism or the feed mechanism described in - remains stopped. 1- Position correction means for driving the feeding mechanism to move the tap tool to a desired stop position.

The rotation mechanism and feed mechanism equipped with the action tap tool are feedback-controlled by the control unit, and the tap tool taps the workpiece material by a combined movement of rotational drive in the circumferential direction and feed drive in the axial direction. If the tap tool is overloaded or the operator performs an emergency stop operation during the process, the control unit outputs an emergency stop signal and stops the rotating mechanism and feed mechanism. do. When the rotation mechanism and the feed mechanism come to an emergency stop, the emergency stop position detection means detects, for example, a rotation stop position, and outputs this detected rotation stop position. Then, the position correction means extracts the set position data from the control unit, calculates the feed stop position where the tap tool should be from the set position data using the detected rotation stop position as a reference, and stops the rotation mechanism based on the calculation result. while driving the feed mechanism,
Move the tap tool to the desired feed stop position.

As a result, the tap tool is corrected to the emergency stop position so that the rotating mechanism is at the set rotational position and the feeding mechanism is at the set feeding position. Thereafter, the control section performs either the operation of continuing the tapping process or returning the tapping process while feedback-controlling the rotation mechanism and the feeding mechanism based on the position correction end signal from the position correction means, and the tap tool automatically returns to the machining starting point.

Example First, the structure of the embodiment will be explained.

As shown in FIG. 1, the tapping device of this embodiment roughly includes a rotation mechanism 1, a feed mechanism 2, a control section 3, an emergency stop position detection means 4, and a position correction means 5. .

Here, the rotation mechanism I includes a spindle motor 11 attached to a slide base 10 and a reduction gear unit 12 connected to its output shaft, and a tap tool 6 is attached to the output end of the reduction gear unit 12. A tool holder 7 is detachably attached thereto, and the rotation of the spindle motor 11 drives the tap tool 6 to rotate in its circumferential direction. Further, a rotational position sensor 13 is attached to the rear of the spindle motor II. This rotational position sensor 13 detects the rotational angle of the spindle motor 11 as the rotational position of the tap tool 6, and outputs an amount of electricity corresponding to the detected rotational position as a detected rotational position Q1□.

The feed mechanism 2 includes a feed shaft motor 21 attached to a fixed base 20 as the main body of the device, and a bolt/nut mechanism 22 connected to the output shaft of the feed shaft motor 21 . A guide member 25 is coaxially coupled to the output shaft and is provided on the fixed base 20 so that a part of the circumferential surface of the nut 24 of the bolt-nut mechanism 22 is connected to the output shaft.
The slide base 10 of the rotating mechanism I is coupled to a part of the circumferential surface of the nut 24 other than the above, and the rotation of the feed shaft motor 21 is converted into linear motion by the bolt-nut mechanism 22. This linear movement linearly drives the tap tool 6, which is detachably attached to the output end of the rotation mechanism 1, in its axial direction. Further, a feed position sensor 26 is installed at the rear of the feed shaft motor 21. The feed position sensor 26 converts and detects the rotation angle of the feed shaft motor 21 as a feed position of the tap tool 6, and outputs an amount of electricity corresponding to the detected feed position as a detected feed position Q.

The control unit 3 controls the second tap tool 6 depending on the type of the tap tool 6.
As shown by the characteristic line in the figure, setting position data D that defines the relationship between the set simultaneous rotation position and the set feed position based on the thread pitch of the tap tool 6 is preset in the memory 30, and the setting position data D is preset in the memory 30. tap tool 6 by operating a switch not shown.
After specifying the type, when the processing start switch 31 is turned on, the drive signal Q3-+ is output to the spindle motor I+, and the drive signal Q3-7 is output to the feed shaft motor 21, and the spindle motor 11 and the feed shaft are The motor 2I is driven in forward rotation, and the rotational position sensor I3 and the feed position sensor 2 are
6 to the detected rotational position Q1-0 and detected feed position Q of the tap tool 6 as output signals thereof.

The detected rotational position Q1-3 and the detected feed position Q, etc., and the tap tool 6 in the data D extracted from the memory 30 by specifying the type of the tap tool 6.
The spindle motor II and the feed shaft motor 21 are feedback-controlled to achieve the set rotational position and set feed position. Further, the control unit 3 detects that the tap tool 6 is overloaded during machining and the detected rotational position QI-1 is
and the detected feed position Q deviate from the set rotational position or the set feed position by more than a predetermined value, or when the operator turns on the emergency stop switch 32 during processing, the spindle motor 11 and feed shaft motor 21 are brought to an emergency stop, and the tap tool 6 is
The emergency stop signal Q3. ．． Outputs 3. Furthermore, the control unit 3 controls the feedback control to be performed by the characteristic line I7 shown in FIG.
When the machining start point E reaches the machining end point F based on the set position data D, the spindle motor I+
The normal rotation of the spindle motor 11 and the feed shaft motor 21 is stopped after a predetermined time delay.
is driven in the reverse direction from the machining end point F, and this reverse drive is stopped at the machining start point E.

The emergency stop position detecting means 4 taps, for example, the output signal Q, -7 of the rotational position sensor 13 at the emergency stop end point B by the emergency stop signal Q, -3 output from the control unit 3 to stop the rotation of the tool 6. The position is detected, and the amount of electricity corresponding to the detected rotational position is output as the detected rotational stop position Q4 (same as the output signal Q1-2).

The position correction means 5 extracts setting position data D from the memory 30 of the control section 3 based on the detected rotation stop position Q4 outputted from the emergency stop position detection means 4, and uses the detected rotation stop position Q4 as a reference. From the set position data D extracted above, a feed stop position C', for example, where the tap tool 6 which is in an emergency stop should be located is calculated. This calculation will be explained with reference to FIG. In Figure 2,
Add ■] The set rotational position at the end point F is Yn, and the set rotational position Y at the machining start point E. For binding, the detected rotation stop position Y1 is at the emergency stop end point B, and the set feed position X is at the machining end point F.
n, and the set feed position X at the weight starting point E. If the detected feed stop low position X1 at the end point B of the emergency stop is set, then this equation (1) is transformed into and further transformed into. This equation (3) is preset in the position correction means 5. Then, from the set position data I) extracted from the control unit 3 and the detected rotation stop position Q4,
By finding numerical values corresponding to o, xn, Yo, Y, , Yn, and substituting the found numerical values into formula (3) and executing the calculation, X in formula (3) is obtained.

There is a tap tool 6 at the emergency stop end point B.

Find the feed stop F position.

After this calculation, the position correction means 5 outputs a position correction means Qsl to the spindle motor 11 based on the calculation result X, and then outputs a position correction signal Q5- to the feed shaft motor 21. 7, and while the rotation mechanism I is stopped, the feed mechanism 2 is driven to move the tap tool 6 to the desired feed position X1, which is the emergency stop end point B, and after a predetermined time delay, the position correction end signal Q5 is output. -3 is output to the control section 3.

Next, the operation of the embodiment will be explained with reference to FIGS. 1 to 3.

First, when performing tapping, the operator moves the tap tool 6 as shown in FIG. is attached to the rotating mechanism 1, a workpiece material (not shown) is placed in front of the tap tool 6, and the type of tap tool 6 is specified by operating a switch (not shown), and then the processing start switch 31 is operated. . Then, execution is started in step 101 in FIG. , the rotation mechanism 1 and the feed mechanism 2 are feedback-controlled, and the tap tool 6 taps the workpiece material while performing a combined movement of the rotation drive by the rotation mechanism 1 and the feed drive by the feed mechanism 2. .

Next, during the tapping process, for example, the characteristic line L in FIG.
- When an emergency stop occurs at the emergency stop start point A of h, the control unit 3
As shown in step 102 of FIG. 3, the emergency stop signal Q3-3 is extracted, and the rotation mechanism 1 and the feed mechanism 2 are brought to an emergency stop at the emergency stop end point B shown in FIG. In parallel with this, the emergency stop position detection means 4 uses the emergency stop signal Q3-1 from the control section 3 to detect the tap tool as an output signal from the rotational position sensor I3, as shown in step 103 in FIG. 6 and outputs the detected rotation stop position Q4 to the position correction means 5.

After that, the position correction means 5 extracts the set position data D from the control section 3 (2, as shown in step 104 in FIG. 3,
Using the above equation (3), the feed stop position where the tap tool 6 should be at the emergency stop end point B, which is X in equation (3), is calculated from the set position data I) using the detected rotation stop position Q4 as a reference, and this calculation is performed. Position correction signal Q based on the result xl
s −+ + Q s −t, the feed mechanism 2 is driven while the rotation mechanism 1 is stopped, and the tap tool 6 is moved to the desired feed stop position X.

Move to. Then, the tap tool 6 stops from the emergency stop end point B shown in FIG. At the same time, the feed mechanism 2 reaches the set feed position, and the emergency stop position of the tap tool 6 becomes the characteristic line 1. Corrected to -1-.

Then, the control unit 3 feedback-controls the rotation mechanism 1 and the feed mechanism 2 using the position correction end signals Q, -3 from the position correction means 5, and as shown in step 105 in FIG. 3, the spindle motor 11 Either the spindle motor 11 and the feed shaft motor 21 are driven in the normal direction to continue tapping, or the spindle motor 11 and the feed shaft motor 2I are driven in the reverse direction to return the tap tool 6. Thereafter, the tap tool 6 is automatically returned to the machining start point E at step I7, and one cycle of position correction at the time of emergency stop is completed at step +06 in FIG.

By the way, M? When the amount of movement from the emergency stop start point A to the emergency stop end point B in Example J was measured, the rotation angle of the spindle motor 11 was about 20 degrees.

Note that the present invention is not limited to the above embodiments,
Although not shown, for example, at the time of an emergency stop, the feed stop position is detected 12, the rotation stop position where the tap tool 6 should be is calculated based on this detected feed stop 1-position, and the position is corrected. It is also possible.

Effects of the Invention As described above, according to the present invention, when an emergency stop occurs during tapping, the emergency stop position detection means detects the rotation stop position at the end point of the emergency stop, and the calculation means detects the detected rotation stop position. Calculate the position where the tap tool should be (feed stop) from the set position data as a reference, drive the feed mechanism with the rotating mechanism stopped (17), move the tap tool to the desired feed stop position, and emergency stop the tap tool Add 1 so that it is located at the set rotation position and set feed position at 1゛- o'clock.
This eliminates the inconvenience of breaking the tap tool or tapped thread due to excessive force during operation after an emergency stop.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is a graph explaining the operation of the embodiment, Fig. 3 is a flowchart of the embodiment, and Fig. 4 is an operation of a conventional tapping device. This is a graph explaining. 1... Rotation mechanism, 2... Feeding mechanism, 3... Control unit,
4...Emergency stop position detection means, 5...Position correction means, 6...Tap tool, 11.-Spindle motor, I
3. Rotation position sensor, 21.. Feed shaft motor, 26. Feed position sensor. Fig. 1 26...Feed position 1 sensor Fig. 2 Machining start point 0 Feed position Fig. 4 Fig. 4 Machining start point Feed position

Claims (1)

[Claims] (1) A rotation mechanism that rotationally drives the tap tool in the circumferential direction; a feed mechanism that linearly feeds and drives the tap tool in the axial direction; and the tap tool performs a combined motion of the rotational drive and the feed drive. a control unit that performs feedback control of the rotation mechanism and the feed mechanism; and an emergency stop signal from the control unit that detects at least either the rotation stop position or the feed stop position at the end point of the emergency stop of the tap tool. An emergency stop position detection means, and the above-mentioned set position data that defines the relationship between the set rotation position and the set feed position that are preset in the control section, based on the detected stop position detected by the emergency stop position detection means. Position correction that calculates the stopping position where the tap tool should be, and based on the calculation result, drives the other while stopping either the rotation mechanism or the feeding mechanism to move the tap tool to the desired stopping position. A tapping device characterized by comprising: means.