JPS58206337A - Driving controller of mechanical feed unit - Google Patents

Abstract

PURPOSE:To continuously machine a car part of different model with a single set of machine, by providing plural driving data setting means individually setting driving data consisting of feed distance and feed speed data and the selecting means selecting said setting means in accordance with a work. CONSTITUTION:Each driving data of feed speed data v11-vnn and feed distance data d11-dnn for respectively different works Q1-Qn is previously set to each register of speed data setters 130A-X and distance data setters 131B-X in a driving data output part 13. If a signal SQ2, classified by a model, showing the work Q2 is input to a work selective instruction part 26, as movable contact pieces RS3, RS4 are stopped at contacts Q2, f2, feed speed and feed distance data v21-v2n and d21-d2n read from the setters 130B and 131B are respectively output to comparators 16, 23. Then a tool mounted to a main spindle machines the work Q2 to a prescribed shape, and if machining is finished, the tool returns to the original point.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a drive control device for a mechanical feed unit having a motor for driving a feed mechanism and a drive source such as a servo nailing system for this motor.

In general, this f insect's mechanical foot unit Qma, -
For example, as shown in FIG. 1, there is a main shaft 1 to which a tool (not shown) is attached, a main shaft motor 6 that rotationally drives this main shaft 1 via a gearbox 2, and a main shaft 1 degree gearbox 2 and main shaft motor 6 as shown in the figure. A saddle 4 placed and fixed on the
A feeding mechanism consisting of a ball screw 6 etc. that moves the saddle 4 in the direction of arrow A along the slide 5, and a DC motor 7 with a speed reducer that is connected to the ball screw 6 of this feeding mechanism and drives the ball screw 6 to rotate. And this DC motor, 7
Based on the feedback signal and drive data from the pulse generator 8 attached to the rotating shaft of the DC motor 7.
It is configured by a DC servo control device 9 etc. that drives and controls the.

In addition, in the same figure, a power supply circuit 10U, a DC servo control device 9
The limit switch 1F for detecting the origin position is activated by being struck by a dog 12 attached to the saddle 4, and its activation signal is input to the DC servo control device 9. It is used for processing as described below.

The DC servo control device 96, which is a drive control device for the mechanical feed unit, has a configuration as shown in FIG. 2, for example.

To explain this simply, the drive data output unit 16 outputs the tool feed rate v1 necessary for machining the workpiece.
A speed data setter 160 consisting of a register group storing .about.vn, a distance data setting device 131 consisting of a register group storing feed distance data d1.about.dn, and a rotary switch 25a of the stepping relay 25, which will be described later.
25b, etc., and each movable contact piece R8+, R
82 is the initial contact a1. b1 to al, l)n'
! Speed data setter 1 by stepping one by one with
The speed data read circuit 162 and the distance data read circuit 166 select each register of the data setter 30 and the distance data setter 131 and read the data of the register.

In addition, each contact point a1~ of the rotary switches 25a, 25b
ao, b1~bn and movable contact pieces R81, R82 have feed speed data v1~τ□ and feed distance data d1, respectively.
Although there are data bits of ~dn, one for each is shown as a representative.

Further, the distance data setter 1 of this drive data output section 16
Feed distance data d1 to d set in each register of 61
n is data representing the travel distance of the tool required to machine the workpiece into the desired shape, and the distance from the origin of the tool to the all machining start position and from the machining end position to the origin. It is set from the outside according to the

Furthermore, the feed speed data υ1 to vn set in each register of the speed data setter 160 are
Transmission V distance data d1 to d set in each register of 61
n, data for determining the feed rate of the tool between each distance, such as the feed rate while moving a distance d1 from the tool origin, and the feed rate while moving a distance d2 from the position reached after moving the distance d1. This is also set in advance from the outside.

When the operation command switch 14 is turned on and the operation command signal S1 is input to the pulse generator 15, this pulse generator 1
5 outputs a pulse signal P that determines the acceleration of the tool.

The comparator 16 receives the command speed data n, which is a numerical value, from the speed counter 17, and the speed data reading circuit 132 and the drive data output section 16 from the register of the speed data setter 160.
Feed speed data υ output via output terminal 01 of
1 to vn, n<v(v=v1 to
The signal C1 that opens the AND gate G1 during n>
A signal C2 is output to open the AND gate G2 during v (v=v1 to vn).

Therefore, the command speed data n when starting the machine is zero°
So, the feed speed data output from output terminal 01 is υ1
Therefore, the speed counter 17 continues to count up the pulse signal P from the pulse generator 15 and increment n until it reaches n''t+i, and after n=v1, the next transmission is started from the output terminal 01. If speed data v2 is output and v2 is n>v2, the pulse signal P is counted down and n continues to be decremented until n-υ2 is reached.

In this way, the command speed data n, which is the counted value of the speed counter 17, is changed to the feed speed data v1 to v1, which is the set value.

match.

Incidentally, acceleration and deceleration are determined based on changes in the divisor value of the speed counter 17 per unit time.

Next, in response to the command speed data n output from the speed counter 17, the D/F converter 18 generates a speed command pulse signal P having a frequency corresponding to the data value n.

is converted to

The deviation counter 19 measures the deviation amount (position amount of error)
Create SD.

Note that the deviation amount SD, which is the output of the deviation counter 19, has a positive or negative value; for example, when the DC motor 7 is rotating clockwise, it is +SD, and when it is rotating counterclockwise, it is -S.
It becomes D.

The D/A converter 20 receives the deviation amount S from the deviation counter 19.
D is converted into a voltage signal VD which is an analog value.

The servo amplifier (speed amplifier) 21 is the I)/A converter 2
Voltage signal vD from 0 and feed pack pulse signal Ql"P"tF/V converter 2 from pulse generator 8
A voltage (No. M) corresponding to the deviation amount from the speed feedback signal vv converted into a voltage signal by
and thereby rotates the DC motor 7 to
Main II attached to saddle 4 in the figure! 1l (1, arrow A
move in the direction.

The comparator 23 receives the moving distance data SP from the distance counter 24 that counts the speed command pulse signal Pn from the D/F converter 18, and the distance data reading circuit 136 and the output terminal 02 from the register of the distance data setting device 161. A match signal C5 is output every time 5P=d(d"dt-dn) by comparing the feed distance data with any of the feed distance data d1 to dn outputted through.

Each time this coincidence signal C5 is output from the comparator 26, the stepping relay 25 (7) is energized and the movable contacts of the rotary switches 25a, 25b of the speed data readout circuit 132 and the distance data readout circuit 136 are activated. Pieces R8+ and R82 are the initial contacts a1. b1 to an,
The distance counter 24 is incremented one by one up to bn, and the count value of the distance counter 24 is reset.

Therefore, the main shaft 1 sent by the DC motor 7 is
The locus represented by the feed distance data d1 to dn set in each register of the distance data setter 131 is moved in a speed pattern represented by the feed speed data v1 to tuna set to each register of the speed data setter 160.

When the main shaft 1 returns to the home position, the dog 12 attached to the saddle 4 shown in FIG. 1 hits the home position detection limit switch 11, and the monostable multivibrator 26 shown in FIG. 2 is activated to send a reset signal. Output R.

Then, the stepping relay 25 is reset by this reset signal R, and the rotary switch 25a,
Movable contacts R81 and R82 of 25b are initial contacts a+
, b+, and at the same time, the operation command switch 14 is turned off and the operation of the machine is stopped.

By the way, a drive control device for a mechanical feed unit such as the one made by Joroki is only equipped with the speed data setting device 160 and distance data setting device 131 necessary for machining a unique workpiece. Therefore, in order to process a variety of workpieces with this device, the feed speed data and feed distance data must be reset to the setting device in accordance with the workpiece rζ to be processed. It was not possible to process different workpieces.

This is a problem that becomes apparent when different types of parts are successively machined, for example, on a machining line for vehicle parts.

An object of the present invention is to provide a drive control device for a mechanical feed unit that does not have the above-mentioned problems.

Therefore, the drive control device for a mechanical feed unit according to the present invention transfers drive data consisting of feed distance data and feed speed data of the sent part (tool attached to the spindle) sent by the feed mechanism to multiple types of workpieces. - L This solves the problem mentioned above.

Hereinafter, embodiments of the present invention will be described with reference to FIG. 3 of the drawings.

FIG. 3 is a block diagram of main parts showing one embodiment of the present invention. Since all the parts except the drive data output section 16 in FIG. 2 are the same, illustration of these parts is omitted. There is.

In the figure, n drive data setting means in the drive data output section 16 include a speed data setter 130A, a distance data setter 131A, a speed data setter 130B, and a distance data setter 131B.

...... Each register of the speed data setter 130X and the distance data setter 161X contains feed speed data v11 to υ1n and feed distance data d11 to d1o, v21 to v2n for different workpieces Q1 to Qn, respectively. and d2j
~d211+..., υn1~υnn and dn
, ~(Inn drive data are set in advance from the outside.

Speed data readout circuit 132A and distance data readout circuit 1
33A is constituted by the rotary switches 25a, 25b, etc. of the stepping relay 25 in FIG.
21 is initial contact a+++b++ to ail'l+
1) Step one by one to In and set the speed data setter 13.
The registers of 0A and distance data setter 131A are selected, and the contents of the selected registers are read.

Speed data read circuit 132B and distance data read circuit 1
33B to speed data readout circuit 132X and distance data readout circuit 163X are each driven by the operating coil of stepping relay 25 in FIG. Each of those movable armatures R8? by being actuated by an operating coil. , R8221・
...RS+ n, RS21 is the initial contact a
21+ b+--anj + 1) 11 to a2n+
b2n"..."Increments one by one until annl bnn.

Thereby, the speed data setter 130B, the distance data setter 131B, . . . speed data setter 13
0X and the register of the distance data setter 131X are selected and the contents of the selected register are read.

The speed data selection circuit 134 and the distance data selection circuit 165, which constitute the drive data selection means in the drive data output section 13, are rotary switches 31a of the stepping relay 31, which will be described later.

31b, and each time the operating coil of the stepping relay 31 is excited, its movable contact pieces R85, R8
4 is the initial contact e1. f1 to en.

Step one by one with fnt to select any one of the drive data for each of the workpieces Q1 to Qn.

The workpiece selection command section 26 is where type signals SQ+ to SQn indicating the types of the workpieces Q1 to Qn are set and input, and when any of these type signals sQ1 to SQn is input, the type is selected. No. 18 is encoder 27,
The code is converted into type data DQ which is a bit signal (for example, if there are 8 types of workpieces, "ooo" to 1111").

The counter 28 is a monostable multivibrator 2 shown in FIG.
The pulse 1 output from the oscillator 29 when G3 is open is reset by the recent multiplier ~R output from G3. Count.

The comparator 30 compares the type data DQ from the encoder 27 with the count value m of the counter 28, and outputs a signal C4 that opens the AND gate G6 only during D□)m.

Therefore, the AND game) G5 outputs the pulse signal Po from the oscillator 29 to the counter 28 and the operation coil of the stepping relay 61 when the numerical value m of the color/relay 28 and the type data DQ match.

The stepping relay 61, like the counter 28,
Since the monostable multivibrator 26 in the figure is reset by the output reset signal R, the movable contact pieces R86 and R84 of the rotary switches 31a and 31b are
Each time the operating coil is excited by the pulse signal Pa, it advances in order from the initial contact eiof+, stops at the position where it has advanced by the number corresponding to the type data DQ, and then selects the four drive coils corresponding to the type of workpiece. Select a data setting method.

That is, when the type signal SQ2 indicating, for example, the workpiece Q2 is input to the workpiece selection command unit 26,
Movable contacts R8s and R of rotary switches 31a and 31b
S4 is contact e2. In order to stop at f2, a speed data read circuit 132B and a distance data read circuit 166B are read from the speed data setter 130B and distance data setter 161B, respectively, which have set drive data for the workpiece Q2.
The feed speed data υ21 to v2n and the feed distance data d2j to d2. are sequentially output to the comparators 16 and 23 in FIG. 2 through the output terminals 01 + 02 of the drive data output section 13, respectively.

Thereafter, the operations described above are performed, and the tool attached to the main spindle 1 shown in FIG. 1 processes the workpiece Q2 into a predetermined shape, and returns to the origin upon completion of the process.

When the tool returns to the home position, the dog 12 attached to the saddle 4 shown in FIG. 1 hits the home position detection limit switch 11, and the fist stabilizing multivibrator 26 shown in FIG. 2 outputs a reset signal (S No. R).

Since the stepping relay 25 in FIG. 2 and the stepping relay 31 and counter 28 in FIG. 6 are reset by this reset signal R, each reading circuit 132A to
132X, 133A to 133X and each selection circuit 1. ! ,
4,135 movable contact pieces R811 to R81n, R821
~R82n, and R85, R84 or initial contact a1
1~an□, b11~bn1. Then, the process returns to e++f1 and waits for the next type signal to be input.

Although the above embodiment has been described based on an example in which each data setter is configured by a group of registers, the invention is not limited to this. For example, instead of each register, a number of entry switches according to the required data length may be used. It may be provided.

A program counter, a multiplexer, etc. may be used instead of the rotary switch of the stepping relay that constitutes the readout circuit and selection circuit.

As described above, the drive control device for a mechanical feed unit according to the present invention has drive data for a plurality of types of workpieces, and selects one of the drive data from among the drive data according to the type of workpiece. You can choose.

Therefore, if the installed tool and feed stroke are appropriate, various workpieces can be machined randomly and continuously.

Therefore, by simply installing one such mechanical feed unit in a machining line for car bodies, etc., parts of different car models can be machined continuously. The number of machines that were lined up on the line can be significantly reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of a mechanical feed unit to which the present invention is applied, and FIG. 2 shows a conventional example of a drive control device for a mechanical feed unit that constitutes the DC servo control device of FIG. Block Diagram FIG. 3 is a narrow block diagram showing one embodiment of the present invention. 1...Main shaft 4...Saddle 5...Slide 6...
... Ball screw 7 ... DC motor 8 ... Pulse generator 9 ... DC service city 11? Wholesale connection: 11...Limit switch for home position detection 13...Drive data output section 14...Operation combination switch 15...Pulse redundant device 16
．． 23.30 reason comparator 17...speed IL counter 19/deviation counter 21
...Servo amplifier 24...Distance counter 25.
31. Stepping relay 28...Counter 130.130A~160X...Speed data setter 13
1.131A to 131X...Distance data setter 132
．． To 132A 132\,゛ Speed data read circuit 133
．． 1368-13,”lX Distance data reading circuit 16
4° speed data selection circuit 135 Distance data selection circuit G+'~Gro・8N+)ril・

Claims (1)

[Claims] 1. In a mechanical feed unit having a drive source constituted by a motor that drives a feed mechanism and a servo control system of the motor, etc., a mechanical feed unit consisting of feed distance data and feed speed data of a portion to be fed sent by the feed mechanism. a plurality of drive data setting means for individually setting drive data corresponding to a plurality of types of workpieces; and a drive data selection means for selecting these drive data setting means according to the type of workpiece. A drive control device for a mechanical feed unit, comprising: