JPH0254310A - Numerical controller for drilling - Google Patents

Abstract

PURPOSE:To omit the labor and the time required when the deviation value is set and changed and to improve the cutting accuracy by performing each time the correcting arithmetic applying deviation value produced actually for the drilling control via a correcting part. CONSTITUTION:When a drill 11 touches the surface of a work, a signal SC is produced and invalidated by a data processing part DP2. Then a contact signal processing part SP8 stops temporarily an interpolator IC4 to stop the feed of the drill 11. An interpolating part RS9 reads the deviation value Z2 out of a servo control part CT5 and corrects the cutting value Z2 into Z2-DELTAZ2. This corrected value is stored in an information storing part DM3 and updated. Then the part DP2 sends the value Z2-DELTAZ2 and the feed speed F2 via the part DM3. Thus the IC4 moves the drill 11 to a cutting surface 13. When a cutting process is over, the DP2 instructs the stop of the time T with the signal of the IC4. The IC4 reads the total shift value measured from a start point 21. The return value Z3 and the feed speed F3 are obtained from the total shift value and supplied to the part DM3. Then the IC4 is started and the drill 11 is moved back to its start point.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a numerical control device for drilling, which is used in combination with a drilling machine or the like to numerically control drilling.

[Conventional technology]

FIG. 4 is a block diagram of a conventional example. When data for positioning the machining part, data for drilling control, etc. are given to the input section (hereinafter referred to as IP) 1 as input data pi, this is processed by the data processing section ( Hereinafter, DP) 2 processes the tool positioning movement direction and movement amount, movement command Zls such as movement amount with respect to the workpiece, specified cutting amount Ztx, movement 1 order z1, cutting amount z3, and the corresponding tools. Feed speed F8°F! etc., and store these in the data storage unit (hereinafter referred to as D
M) Store in 3.

Then, depending on the contents of DM3, interpolator (hereinafter referred to as IC) 4
sends out distribution pulses, which are controlled by the servo control unit (hereinafter referred to as C
T) 5, c'rs is connected to a drive amplifier (hereinafter referred to as D
A) A motor (hereinafter referred to as M) T is driven through at to start positioning operation of the tool, and when positioning is completed, a feeding operation for moving a tool such as a drill to the workpiece is started.

At this time, in response to the positioning end signal from IC4, DP
2 is the contact signal ge generated when the drill contacts the workpiece
In order to send a command to enable the contact signal processing unit (hereinafter referred to as 5P) 8, the SF3 activates the IC due to the generation of the contact signal 8e.
4 is temporarily stopped, DP2 determines that drilling has started according to the contact signal 3c, and saves each data of this to 0M.
3, the IC4 sends out a distribution pulse based on the cutting amount z2 and the feed rate F2, resumes driving M7 via CT5 and DA6, and thereby starts drilling the workpiece. It has become.

In addition, with respect to the cutting amount zz, the feed amount of the drill according to the movement command zl has an error from the specified movement amount depending on the driving situation due to the rotation of M7, and this deviation amount ΔZ2 causes the amount of υ cutting 2 ! It is necessary to correct the deviation amount Δ2 in advance.
! is set, and the corrected cutting amount (zz−Δ
22) is given as input data Dl.

[Problem to be solved by the invention]

However, in the above case, the deviation amount Δz2 must be changed every time the feed rate during the approach period until the drill contacts the workpiece is changed, which is troublesome and
If the feed speed during the approach period is increased, the change in the deviation amount Δz will be large accordingly, and if a constant deviation of 1lz3 is used, the accuracy of the cutting amount will deteriorate, so the feed speed during the approach period must be increased. This has the disadvantage of not being able to be highly precise and reducing production efficiency.

[Rounding method to solve the problem]

In order to solve the above-mentioned problems, the present invention is configured by the following means.

That is, in the above-mentioned numerical control device, IJi2i!, the amount of actual movement of the tool, is determined in response to the generation of a contact signal generated when the tool comes into contact with the workpiece. F) A correction unit is provided which performs a correction calculation of the specified cutting amount and uses the corrected cutting amount obtained thereby for drilling control.

[Effect]

Therefore, the correction section performs a correction calculation using the actual deviation amount each time, and the corrected cutting amount resulting from this is used for drilling control, so the effort required to change the deviation amount setting can be reduced to 4i#@. At the same time, the accuracy of the cutting amount is the same as above.

[Example] Examples are shown below! The present invention will be explained in detail with reference to Figures 1 to 3.

Figure 1 is a block diagram, Figure 2 is a diagram showing the relationship between the movement command 21% cutting command ZR1 and return machine Z3, and Figure 3 is a diagram showing the control status of the tool. In addition to what is shown in FIG. 4, a correction section (hereinafter referred to as R8) 9 is provided, which performs correction calculations.

Here, when input data Di is given to IPl in diagram M1, DP2 processes it, and generates the movement command Zls of the drill 11 shown in FIG. 2, the cutting amount Z2s, and each feed rate F 1 * F in FIG. 2 and store them in 0M3.

In addition, at this time, the positioning movement amounts X and Y shown in FIG. 3 are also given by the input data Di, and this is also 0M3.
is stored in

Then, control is first performed based on the positioning movement amounts X and Y, and then the same as in FIG.
- Drive M7 through 3g3 to start feeding the drill 11 from the initial point 21 in Figure 3. When the light leakage of the drill 11 comes into contact with the workpiece surface 12 in Figure 2, at the generation point 22 in Figure 3. A contact signal SC occurs, and at this time DP
2 makes this valid, the SF3 stops the IC4t'-in response to the contact signal Sc, and stops feeding the drill 11.

At this time, the CT5 receives the movement command 21 and the actual drill 11.
The deviation amount Δz2 from the amount of movement p1 is maintained.
In response to contact number Sc, R89 reads the deviation amount Δz2 from CT5, corrects the cutting amount z8 by the correction calculation of z2 - Δz3, gives and stores the corrected cutting amount to 0M3, and calculates the cutting amount z2 by this. Update.

Next, DP2 sets the corrected cutting amount and feed rate F2 to 0M3.
In response to this, the IC4 sends out a distribution pulse to feed the drill 11 at the cutting surface txt in FIG.
P2 commands a stop for the time T1 shown in Fig. 3, reads the total amount of movement from the initial point 21 from the IC4, calculates the return amount z3 and the forward speed F3 based on this, and transfers these to 0M3. The IC 4 starts operating, and the drill 11 returns to the initial point 211.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, by providing a correction section that performs a correction calculation of the specified cutting amount based on the deviation amount of the actual movement amount of the tool in response to the generation of the contact signal, In addition to eliminating the need to change the deviation amount settings due to changes in various conditions, it is also possible to improve the accuracy of the cutting amount even if the feed rate during the approach period is increased, resulting in high production efficiency and improved hole drilling. Remarkable effects can be obtained in numerical control of processing.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, FIG. 1 is a block diagram, FIG. 2 is a diagram showing the relationship between movement commands, cutting amount, and return p amount, and FIG. 3 is a tool control situation. FIG. 4 is a block diagram of a conventional example. 1...Input section, 2...Data processing section, 3...
・Data storage unit, 4...Interpolator, 5...Servo control unit, 8...Touch signal processing unit, 9...Correction unit, se...Touch signal, zl. ...Movement command,
z= ...cutting amount. % Fraudulent Applicant NEC Corporation NEC Robot Engineering Floor Type Company Type Physician Masaki Yamakawa (and 2 others)

Claims (1)

[Claims] In a numerical control device that performs drilling control based on a specified cutting amount, the specified cutting amount is determined based on the deviation amount of the actual movement of the tool in response to a contact signal generated when a tool contacts a workpiece. 1. A numerical control device for drilling holes, comprising a correction section that performs a correction calculation and uses the corrected cutting amount obtained by the calculation for drilling control.